1 /* 2 * Copyright (c) 1997, 2010, 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 "incls/_precompiled.incl" 26 # include "incls/_methodOop.cpp.incl" 27 28 29 // Implementation of methodOopDesc 30 31 address methodOopDesc::get_i2c_entry() { 32 assert(_adapter != NULL, "must have"); 33 return _adapter->get_i2c_entry(); 34 } 35 36 address methodOopDesc::get_c2i_entry() { 37 assert(_adapter != NULL, "must have"); 38 return _adapter->get_c2i_entry(); 39 } 40 41 address methodOopDesc::get_c2i_unverified_entry() { 42 assert(_adapter != NULL, "must have"); 43 return _adapter->get_c2i_unverified_entry(); 44 } 45 46 char* methodOopDesc::name_and_sig_as_C_string() { 47 return name_and_sig_as_C_string(Klass::cast(constants()->pool_holder()), name(), signature()); 48 } 49 50 char* methodOopDesc::name_and_sig_as_C_string(char* buf, int size) { 51 return name_and_sig_as_C_string(Klass::cast(constants()->pool_holder()), name(), signature(), buf, size); 52 } 53 54 char* methodOopDesc::name_and_sig_as_C_string(Klass* klass, symbolOop method_name, symbolOop signature) { 55 const char* klass_name = klass->external_name(); 56 int klass_name_len = (int)strlen(klass_name); 57 int method_name_len = method_name->utf8_length(); 58 int len = klass_name_len + 1 + method_name_len + signature->utf8_length(); 59 char* dest = NEW_RESOURCE_ARRAY(char, len + 1); 60 strcpy(dest, klass_name); 61 dest[klass_name_len] = '.'; 62 strcpy(&dest[klass_name_len + 1], method_name->as_C_string()); 63 strcpy(&dest[klass_name_len + 1 + method_name_len], signature->as_C_string()); 64 dest[len] = 0; 65 return dest; 66 } 67 68 char* methodOopDesc::name_and_sig_as_C_string(Klass* klass, symbolOop method_name, symbolOop signature, char* buf, int size) { 69 symbolOop klass_name = klass->name(); 70 klass_name->as_klass_external_name(buf, size); 71 int len = (int)strlen(buf); 72 73 if (len < size - 1) { 74 buf[len++] = '.'; 75 76 method_name->as_C_string(&(buf[len]), size - len); 77 len = (int)strlen(buf); 78 79 signature->as_C_string(&(buf[len]), size - len); 80 } 81 82 return buf; 83 } 84 85 int methodOopDesc::fast_exception_handler_bci_for(KlassHandle ex_klass, int throw_bci, TRAPS) { 86 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index) 87 const int beg_bci_offset = 0; 88 const int end_bci_offset = 1; 89 const int handler_bci_offset = 2; 90 const int klass_index_offset = 3; 91 const int entry_size = 4; 92 // access exception table 93 typeArrayHandle table (THREAD, constMethod()->exception_table()); 94 int length = table->length(); 95 assert(length % entry_size == 0, "exception table format has changed"); 96 // iterate through all entries sequentially 97 constantPoolHandle pool(THREAD, constants()); 98 for (int i = 0; i < length; i += entry_size) { 99 int beg_bci = table->int_at(i + beg_bci_offset); 100 int end_bci = table->int_at(i + end_bci_offset); 101 assert(beg_bci <= end_bci, "inconsistent exception table"); 102 if (beg_bci <= throw_bci && throw_bci < end_bci) { 103 // exception handler bci range covers throw_bci => investigate further 104 int handler_bci = table->int_at(i + handler_bci_offset); 105 int klass_index = table->int_at(i + klass_index_offset); 106 if (klass_index == 0) { 107 return handler_bci; 108 } else if (ex_klass.is_null()) { 109 return handler_bci; 110 } else { 111 // we know the exception class => get the constraint class 112 // this may require loading of the constraint class; if verification 113 // fails or some other exception occurs, return handler_bci 114 klassOop k = pool->klass_at(klass_index, CHECK_(handler_bci)); 115 KlassHandle klass = KlassHandle(THREAD, k); 116 assert(klass.not_null(), "klass not loaded"); 117 if (ex_klass->is_subtype_of(klass())) { 118 return handler_bci; 119 } 120 } 121 } 122 } 123 124 return -1; 125 } 126 127 methodOop methodOopDesc::method_from_bcp(address bcp) { 128 debug_only(static int count = 0; count++); 129 assert(Universe::heap()->is_in_permanent(bcp), "bcp not in perm_gen"); 130 // TO DO: this may be unsafe in some configurations 131 HeapWord* p = Universe::heap()->block_start(bcp); 132 assert(Universe::heap()->block_is_obj(p), "must be obj"); 133 assert(oop(p)->is_constMethod(), "not a method"); 134 return constMethodOop(p)->method(); 135 } 136 137 138 void methodOopDesc::mask_for(int bci, InterpreterOopMap* mask) { 139 140 Thread* myThread = Thread::current(); 141 methodHandle h_this(myThread, this); 142 #ifdef ASSERT 143 bool has_capability = myThread->is_VM_thread() || 144 myThread->is_ConcurrentGC_thread() || 145 myThread->is_GC_task_thread(); 146 147 if (!has_capability) { 148 if (!VerifyStack && !VerifyLastFrame) { 149 // verify stack calls this outside VM thread 150 warning("oopmap should only be accessed by the " 151 "VM, GC task or CMS threads (or during debugging)"); 152 InterpreterOopMap local_mask; 153 instanceKlass::cast(method_holder())->mask_for(h_this, bci, &local_mask); 154 local_mask.print(); 155 } 156 } 157 #endif 158 instanceKlass::cast(method_holder())->mask_for(h_this, bci, mask); 159 return; 160 } 161 162 163 int methodOopDesc::bci_from(address bcp) const { 164 assert(is_native() && bcp == code_base() || contains(bcp) || is_error_reported(), "bcp doesn't belong to this method"); 165 return bcp - code_base(); 166 } 167 168 169 // Return (int)bcx if it appears to be a valid BCI. 170 // Return bci_from((address)bcx) if it appears to be a valid BCP. 171 // Return -1 otherwise. 172 // Used by profiling code, when invalid data is a possibility. 173 // The caller is responsible for validating the methodOop itself. 174 int methodOopDesc::validate_bci_from_bcx(intptr_t bcx) const { 175 // keep bci as -1 if not a valid bci 176 int bci = -1; 177 if (bcx == 0 || (address)bcx == code_base()) { 178 // code_size() may return 0 and we allow 0 here 179 // the method may be native 180 bci = 0; 181 } else if (frame::is_bci(bcx)) { 182 if (bcx < code_size()) { 183 bci = (int)bcx; 184 } 185 } else if (contains((address)bcx)) { 186 bci = (address)bcx - code_base(); 187 } 188 // Assert that if we have dodged any asserts, bci is negative. 189 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0"); 190 return bci; 191 } 192 193 address methodOopDesc::bcp_from(int bci) const { 194 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()), "illegal bci"); 195 address bcp = code_base() + bci; 196 assert(is_native() && bcp == code_base() || contains(bcp), "bcp doesn't belong to this method"); 197 return bcp; 198 } 199 200 201 int methodOopDesc::object_size(bool is_native) { 202 // If native, then include pointers for native_function and signature_handler 203 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0; 204 int extra_words = align_size_up(extra_bytes, BytesPerWord) / BytesPerWord; 205 return align_object_size(header_size() + extra_words); 206 } 207 208 209 symbolOop methodOopDesc::klass_name() const { 210 klassOop k = method_holder(); 211 assert(k->is_klass(), "must be klass"); 212 instanceKlass* ik = (instanceKlass*) k->klass_part(); 213 return ik->name(); 214 } 215 216 217 void methodOopDesc::set_interpreter_kind() { 218 int kind = Interpreter::method_kind(methodOop(this)); 219 assert(kind != Interpreter::invalid, 220 "interpreter entry must be valid"); 221 set_interpreter_kind(kind); 222 } 223 224 225 // Attempt to return method oop to original state. Clear any pointers 226 // (to objects outside the shared spaces). We won't be able to predict 227 // where they should point in a new JVM. Further initialize some 228 // entries now in order allow them to be write protected later. 229 230 void methodOopDesc::remove_unshareable_info() { 231 unlink_method(); 232 set_interpreter_kind(); 233 } 234 235 236 bool methodOopDesc::was_executed_more_than(int n) const { 237 // Invocation counter is reset when the methodOop is compiled. 238 // If the method has compiled code we therefore assume it has 239 // be excuted more than n times. 240 if (is_accessor() || is_empty_method() || (code() != NULL)) { 241 // interpreter doesn't bump invocation counter of trivial methods 242 // compiler does not bump invocation counter of compiled methods 243 return true; 244 } else if (_invocation_counter.carry()) { 245 // The carry bit is set when the counter overflows and causes 246 // a compilation to occur. We don't know how many times 247 // the counter has been reset, so we simply assume it has 248 // been executed more than n times. 249 return true; 250 } else { 251 return invocation_count() > n; 252 } 253 } 254 255 #ifndef PRODUCT 256 void methodOopDesc::print_invocation_count() const { 257 if (is_static()) tty->print("static "); 258 if (is_final()) tty->print("final "); 259 if (is_synchronized()) tty->print("synchronized "); 260 if (is_native()) tty->print("native "); 261 method_holder()->klass_part()->name()->print_symbol_on(tty); 262 tty->print("."); 263 name()->print_symbol_on(tty); 264 signature()->print_symbol_on(tty); 265 266 if (WizardMode) { 267 // dump the size of the byte codes 268 tty->print(" {%d}", code_size()); 269 } 270 tty->cr(); 271 272 tty->print_cr (" interpreter_invocation_count: %8d ", interpreter_invocation_count()); 273 tty->print_cr (" invocation_counter: %8d ", invocation_count()); 274 tty->print_cr (" backedge_counter: %8d ", backedge_count()); 275 if (CountCompiledCalls) { 276 tty->print_cr (" compiled_invocation_count: %8d ", compiled_invocation_count()); 277 } 278 279 } 280 #endif 281 282 // Build a methodDataOop object to hold information about this method 283 // collected in the interpreter. 284 void methodOopDesc::build_interpreter_method_data(methodHandle method, TRAPS) { 285 // Grab a lock here to prevent multiple 286 // methodDataOops from being created. 287 MutexLocker ml(MethodData_lock, THREAD); 288 if (method->method_data() == NULL) { 289 methodDataOop method_data = oopFactory::new_methodData(method, CHECK); 290 method->set_method_data(method_data); 291 if (PrintMethodData && (Verbose || WizardMode)) { 292 ResourceMark rm(THREAD); 293 tty->print("build_interpreter_method_data for "); 294 method->print_name(tty); 295 tty->cr(); 296 // At the end of the run, the MDO, full of data, will be dumped. 297 } 298 } 299 } 300 301 void methodOopDesc::cleanup_inline_caches() { 302 // The current system doesn't use inline caches in the interpreter 303 // => nothing to do (keep this method around for future use) 304 } 305 306 307 int methodOopDesc::extra_stack_words() { 308 // not an inline function, to avoid a header dependency on Interpreter 309 return extra_stack_entries() * Interpreter::stackElementSize; 310 } 311 312 313 void methodOopDesc::compute_size_of_parameters(Thread *thread) { 314 symbolHandle h_signature(thread, signature()); 315 ArgumentSizeComputer asc(h_signature); 316 set_size_of_parameters(asc.size() + (is_static() ? 0 : 1)); 317 } 318 319 #ifdef CC_INTERP 320 void methodOopDesc::set_result_index(BasicType type) { 321 _result_index = Interpreter::BasicType_as_index(type); 322 } 323 #endif 324 325 BasicType methodOopDesc::result_type() const { 326 ResultTypeFinder rtf(signature()); 327 return rtf.type(); 328 } 329 330 331 bool methodOopDesc::is_empty_method() const { 332 return code_size() == 1 333 && *code_base() == Bytecodes::_return; 334 } 335 336 337 bool methodOopDesc::is_vanilla_constructor() const { 338 // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method 339 // which only calls the superclass vanilla constructor and possibly does stores of 340 // zero constants to local fields: 341 // 342 // aload_0 343 // invokespecial 344 // indexbyte1 345 // indexbyte2 346 // 347 // followed by an (optional) sequence of: 348 // 349 // aload_0 350 // aconst_null / iconst_0 / fconst_0 / dconst_0 351 // putfield 352 // indexbyte1 353 // indexbyte2 354 // 355 // followed by: 356 // 357 // return 358 359 assert(name() == vmSymbols::object_initializer_name(), "Should only be called for default constructors"); 360 assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors"); 361 int size = code_size(); 362 // Check if size match 363 if (size == 0 || size % 5 != 0) return false; 364 address cb = code_base(); 365 int last = size - 1; 366 if (cb[0] != Bytecodes::_aload_0 || cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) { 367 // Does not call superclass default constructor 368 return false; 369 } 370 // Check optional sequence 371 for (int i = 4; i < last; i += 5) { 372 if (cb[i] != Bytecodes::_aload_0) return false; 373 if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false; 374 if (cb[i+2] != Bytecodes::_putfield) return false; 375 } 376 return true; 377 } 378 379 380 bool methodOopDesc::compute_has_loops_flag() { 381 BytecodeStream bcs(methodOop(this)); 382 Bytecodes::Code bc; 383 384 while ((bc = bcs.next()) >= 0) { 385 switch( bc ) { 386 case Bytecodes::_ifeq: 387 case Bytecodes::_ifnull: 388 case Bytecodes::_iflt: 389 case Bytecodes::_ifle: 390 case Bytecodes::_ifne: 391 case Bytecodes::_ifnonnull: 392 case Bytecodes::_ifgt: 393 case Bytecodes::_ifge: 394 case Bytecodes::_if_icmpeq: 395 case Bytecodes::_if_icmpne: 396 case Bytecodes::_if_icmplt: 397 case Bytecodes::_if_icmpgt: 398 case Bytecodes::_if_icmple: 399 case Bytecodes::_if_icmpge: 400 case Bytecodes::_if_acmpeq: 401 case Bytecodes::_if_acmpne: 402 case Bytecodes::_goto: 403 case Bytecodes::_jsr: 404 if( bcs.dest() < bcs.next_bci() ) _access_flags.set_has_loops(); 405 break; 406 407 case Bytecodes::_goto_w: 408 case Bytecodes::_jsr_w: 409 if( bcs.dest_w() < bcs.next_bci() ) _access_flags.set_has_loops(); 410 break; 411 } 412 } 413 _access_flags.set_loops_flag_init(); 414 return _access_flags.has_loops(); 415 } 416 417 418 bool methodOopDesc::is_final_method() const { 419 // %%% Should return true for private methods also, 420 // since there is no way to override them. 421 return is_final() || Klass::cast(method_holder())->is_final(); 422 } 423 424 425 bool methodOopDesc::is_strict_method() const { 426 return is_strict(); 427 } 428 429 430 bool methodOopDesc::can_be_statically_bound() const { 431 if (is_final_method()) return true; 432 return vtable_index() == nonvirtual_vtable_index; 433 } 434 435 436 bool methodOopDesc::is_accessor() const { 437 if (code_size() != 5) return false; 438 if (size_of_parameters() != 1) return false; 439 methodOop m = (methodOop)this; // pass to code_at() to avoid method_from_bcp 440 if (Bytecodes::java_code_at(code_base()+0, m) != Bytecodes::_aload_0 ) return false; 441 if (Bytecodes::java_code_at(code_base()+1, m) != Bytecodes::_getfield) return false; 442 if (Bytecodes::java_code_at(code_base()+4, m) != Bytecodes::_areturn && 443 Bytecodes::java_code_at(code_base()+4, m) != Bytecodes::_ireturn ) return false; 444 return true; 445 } 446 447 448 bool methodOopDesc::is_initializer() const { 449 return name() == vmSymbols::object_initializer_name() || name() == vmSymbols::class_initializer_name(); 450 } 451 452 453 objArrayHandle methodOopDesc::resolved_checked_exceptions_impl(methodOop this_oop, TRAPS) { 454 int length = this_oop->checked_exceptions_length(); 455 if (length == 0) { // common case 456 return objArrayHandle(THREAD, Universe::the_empty_class_klass_array()); 457 } else { 458 methodHandle h_this(THREAD, this_oop); 459 objArrayOop m_oop = oopFactory::new_objArray(SystemDictionary::Class_klass(), length, CHECK_(objArrayHandle())); 460 objArrayHandle mirrors (THREAD, m_oop); 461 for (int i = 0; i < length; i++) { 462 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe 463 klassOop k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle())); 464 assert(Klass::cast(k)->is_subclass_of(SystemDictionary::Throwable_klass()), "invalid exception class"); 465 mirrors->obj_at_put(i, Klass::cast(k)->java_mirror()); 466 } 467 return mirrors; 468 } 469 }; 470 471 472 int methodOopDesc::line_number_from_bci(int bci) const { 473 if (bci == SynchronizationEntryBCI) bci = 0; 474 assert(bci == 0 || 0 <= bci && bci < code_size(), "illegal bci"); 475 int best_bci = 0; 476 int best_line = -1; 477 478 if (has_linenumber_table()) { 479 // The line numbers are a short array of 2-tuples [start_pc, line_number]. 480 // Not necessarily sorted and not necessarily one-to-one. 481 CompressedLineNumberReadStream stream(compressed_linenumber_table()); 482 while (stream.read_pair()) { 483 if (stream.bci() == bci) { 484 // perfect match 485 return stream.line(); 486 } else { 487 // update best_bci/line 488 if (stream.bci() < bci && stream.bci() >= best_bci) { 489 best_bci = stream.bci(); 490 best_line = stream.line(); 491 } 492 } 493 } 494 } 495 return best_line; 496 } 497 498 499 bool methodOopDesc::is_klass_loaded_by_klass_index(int klass_index) const { 500 if( _constants->tag_at(klass_index).is_unresolved_klass() ) { 501 Thread *thread = Thread::current(); 502 symbolHandle klass_name(thread, _constants->klass_name_at(klass_index)); 503 Handle loader(thread, instanceKlass::cast(method_holder())->class_loader()); 504 Handle prot (thread, Klass::cast(method_holder())->protection_domain()); 505 return SystemDictionary::find(klass_name, loader, prot, thread) != NULL; 506 } else { 507 return true; 508 } 509 } 510 511 512 bool methodOopDesc::is_klass_loaded(int refinfo_index, bool must_be_resolved) const { 513 int klass_index = _constants->klass_ref_index_at(refinfo_index); 514 if (must_be_resolved) { 515 // Make sure klass is resolved in constantpool. 516 if (constants()->tag_at(klass_index).is_unresolved_klass()) return false; 517 } 518 return is_klass_loaded_by_klass_index(klass_index); 519 } 520 521 522 void methodOopDesc::set_native_function(address function, bool post_event_flag) { 523 assert(function != NULL, "use clear_native_function to unregister natives"); 524 address* native_function = native_function_addr(); 525 526 // We can see racers trying to place the same native function into place. Once 527 // is plenty. 528 address current = *native_function; 529 if (current == function) return; 530 if (post_event_flag && JvmtiExport::should_post_native_method_bind() && 531 function != NULL) { 532 // native_method_throw_unsatisfied_link_error_entry() should only 533 // be passed when post_event_flag is false. 534 assert(function != 535 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 536 "post_event_flag mis-match"); 537 538 // post the bind event, and possible change the bind function 539 JvmtiExport::post_native_method_bind(this, &function); 540 } 541 *native_function = function; 542 // This function can be called more than once. We must make sure that we always 543 // use the latest registered method -> check if a stub already has been generated. 544 // If so, we have to make it not_entrant. 545 nmethod* nm = code(); // Put it into local variable to guard against concurrent updates 546 if (nm != NULL) { 547 nm->make_not_entrant(); 548 } 549 } 550 551 552 bool methodOopDesc::has_native_function() const { 553 address func = native_function(); 554 return (func != NULL && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry()); 555 } 556 557 558 void methodOopDesc::clear_native_function() { 559 set_native_function( 560 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 561 !native_bind_event_is_interesting); 562 clear_code(); 563 } 564 565 566 void methodOopDesc::set_signature_handler(address handler) { 567 address* signature_handler = signature_handler_addr(); 568 *signature_handler = handler; 569 } 570 571 572 bool methodOopDesc::is_not_compilable(int comp_level) const { 573 if (is_method_handle_invoke()) { 574 // compilers must recognize this method specially, or not at all 575 return true; 576 } 577 578 #ifdef COMPILER2 579 if (is_tier1_compile(comp_level)) { 580 if (is_not_tier1_compilable()) { 581 return true; 582 } 583 } 584 #endif // COMPILER2 585 return (_invocation_counter.state() == InvocationCounter::wait_for_nothing) 586 || (number_of_breakpoints() > 0); 587 } 588 589 // call this when compiler finds that this method is not compilable 590 void methodOopDesc::set_not_compilable(int comp_level, bool report) { 591 if (PrintCompilation && report) { 592 ttyLocker ttyl; 593 tty->print("made not compilable "); 594 this->print_short_name(tty); 595 int size = this->code_size(); 596 if (size > 0) 597 tty->print(" (%d bytes)", size); 598 tty->cr(); 599 } 600 if ((TraceDeoptimization || LogCompilation) && (xtty != NULL)) { 601 ttyLocker ttyl; 602 xtty->begin_elem("make_not_compilable thread='%d'", (int) os::current_thread_id()); 603 xtty->method(methodOop(this)); 604 xtty->stamp(); 605 xtty->end_elem(); 606 } 607 #ifdef COMPILER2 608 if (is_tier1_compile(comp_level)) { 609 set_not_tier1_compilable(); 610 return; 611 } 612 #endif /* COMPILER2 */ 613 assert(comp_level == CompLevel_highest_tier, "unexpected compilation level"); 614 invocation_counter()->set_state(InvocationCounter::wait_for_nothing); 615 backedge_counter()->set_state(InvocationCounter::wait_for_nothing); 616 } 617 618 // Revert to using the interpreter and clear out the nmethod 619 void methodOopDesc::clear_code() { 620 621 // this may be NULL if c2i adapters have not been made yet 622 // Only should happen at allocate time. 623 if (_adapter == NULL) { 624 _from_compiled_entry = NULL; 625 } else { 626 _from_compiled_entry = _adapter->get_c2i_entry(); 627 } 628 OrderAccess::storestore(); 629 _from_interpreted_entry = _i2i_entry; 630 OrderAccess::storestore(); 631 _code = NULL; 632 } 633 634 // Called by class data sharing to remove any entry points (which are not shared) 635 void methodOopDesc::unlink_method() { 636 _code = NULL; 637 _i2i_entry = NULL; 638 _from_interpreted_entry = NULL; 639 if (is_native()) { 640 *native_function_addr() = NULL; 641 set_signature_handler(NULL); 642 } 643 NOT_PRODUCT(set_compiled_invocation_count(0);) 644 invocation_counter()->reset(); 645 backedge_counter()->reset(); 646 _adapter = NULL; 647 _from_compiled_entry = NULL; 648 assert(_method_data == NULL, "unexpected method data?"); 649 set_method_data(NULL); 650 set_interpreter_throwout_count(0); 651 set_interpreter_invocation_count(0); 652 _highest_tier_compile = CompLevel_none; 653 } 654 655 // Called when the method_holder is getting linked. Setup entrypoints so the method 656 // is ready to be called from interpreter, compiler, and vtables. 657 void methodOopDesc::link_method(methodHandle h_method, TRAPS) { 658 assert(_i2i_entry == NULL, "should only be called once"); 659 assert(_adapter == NULL, "init'd to NULL" ); 660 assert( _code == NULL, "nothing compiled yet" ); 661 662 // Setup interpreter entrypoint 663 assert(this == h_method(), "wrong h_method()" ); 664 address entry = Interpreter::entry_for_method(h_method); 665 assert(entry != NULL, "interpreter entry must be non-null"); 666 // Sets both _i2i_entry and _from_interpreted_entry 667 set_interpreter_entry(entry); 668 if (is_native() && !is_method_handle_invoke()) { 669 set_native_function( 670 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 671 !native_bind_event_is_interesting); 672 } 673 674 // Setup compiler entrypoint. This is made eagerly, so we do not need 675 // special handling of vtables. An alternative is to make adapters more 676 // lazily by calling make_adapter() from from_compiled_entry() for the 677 // normal calls. For vtable calls life gets more complicated. When a 678 // call-site goes mega-morphic we need adapters in all methods which can be 679 // called from the vtable. We need adapters on such methods that get loaded 680 // later. Ditto for mega-morphic itable calls. If this proves to be a 681 // problem we'll make these lazily later. 682 (void) make_adapters(h_method, CHECK); 683 684 // ONLY USE the h_method now as make_adapter may have blocked 685 686 } 687 688 address methodOopDesc::make_adapters(methodHandle mh, TRAPS) { 689 // Adapters for compiled code are made eagerly here. They are fairly 690 // small (generally < 100 bytes) and quick to make (and cached and shared) 691 // so making them eagerly shouldn't be too expensive. 692 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh); 693 if (adapter == NULL ) { 694 THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "out of space in CodeCache for adapters"); 695 } 696 697 mh->set_adapter_entry(adapter); 698 mh->_from_compiled_entry = adapter->get_c2i_entry(); 699 return adapter->get_c2i_entry(); 700 } 701 702 // The verified_code_entry() must be called when a invoke is resolved 703 // on this method. 704 705 // It returns the compiled code entry point, after asserting not null. 706 // This function is called after potential safepoints so that nmethod 707 // or adapter that it points to is still live and valid. 708 // This function must not hit a safepoint! 709 address methodOopDesc::verified_code_entry() { 710 debug_only(No_Safepoint_Verifier nsv;) 711 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code); 712 if (code == NULL && UseCodeCacheFlushing) { 713 nmethod *saved_code = CodeCache::find_and_remove_saved_code(this); 714 if (saved_code != NULL) { 715 methodHandle method(this); 716 assert( ! saved_code->is_osr_method(), "should not get here for osr" ); 717 set_code( method, saved_code ); 718 } 719 } 720 721 assert(_from_compiled_entry != NULL, "must be set"); 722 return _from_compiled_entry; 723 } 724 725 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all 726 // (could be racing a deopt). 727 // Not inline to avoid circular ref. 728 bool methodOopDesc::check_code() const { 729 // cached in a register or local. There's a race on the value of the field. 730 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code); 731 return code == NULL || (code->method() == NULL) || (code->method() == (methodOop)this && !code->is_osr_method()); 732 } 733 734 // Install compiled code. Instantly it can execute. 735 void methodOopDesc::set_code(methodHandle mh, nmethod *code) { 736 assert( code, "use clear_code to remove code" ); 737 assert( mh->check_code(), "" ); 738 739 guarantee(mh->adapter() != NULL, "Adapter blob must already exist!"); 740 741 // These writes must happen in this order, because the interpreter will 742 // directly jump to from_interpreted_entry which jumps to an i2c adapter 743 // which jumps to _from_compiled_entry. 744 mh->_code = code; // Assign before allowing compiled code to exec 745 746 int comp_level = code->comp_level(); 747 // In theory there could be a race here. In practice it is unlikely 748 // and not worth worrying about. 749 if (comp_level > mh->highest_tier_compile()) { 750 mh->set_highest_tier_compile(comp_level); 751 } 752 753 OrderAccess::storestore(); 754 #ifdef SHARK 755 mh->_from_interpreted_entry = code->instructions_begin(); 756 #else 757 mh->_from_compiled_entry = code->verified_entry_point(); 758 OrderAccess::storestore(); 759 // Instantly compiled code can execute. 760 mh->_from_interpreted_entry = mh->get_i2c_entry(); 761 #endif // SHARK 762 763 } 764 765 766 bool methodOopDesc::is_overridden_in(klassOop k) const { 767 instanceKlass* ik = instanceKlass::cast(k); 768 769 if (ik->is_interface()) return false; 770 771 // If method is an interface, we skip it - except if it 772 // is a miranda method 773 if (instanceKlass::cast(method_holder())->is_interface()) { 774 // Check that method is not a miranda method 775 if (ik->lookup_method(name(), signature()) == NULL) { 776 // No implementation exist - so miranda method 777 return false; 778 } 779 return true; 780 } 781 782 assert(ik->is_subclass_of(method_holder()), "should be subklass"); 783 assert(ik->vtable() != NULL, "vtable should exist"); 784 if (vtable_index() == nonvirtual_vtable_index) { 785 return false; 786 } else { 787 methodOop vt_m = ik->method_at_vtable(vtable_index()); 788 return vt_m != methodOop(this); 789 } 790 } 791 792 793 // give advice about whether this methodOop should be cached or not 794 bool methodOopDesc::should_not_be_cached() const { 795 if (is_old()) { 796 // This method has been redefined. It is either EMCP or obsolete 797 // and we don't want to cache it because that would pin the method 798 // down and prevent it from being collectible if and when it 799 // finishes executing. 800 return true; 801 } 802 803 if (mark()->should_not_be_cached()) { 804 // It is either not safe or not a good idea to cache this 805 // method at this time because of the state of the embedded 806 // markOop. See markOop.cpp for the gory details. 807 return true; 808 } 809 810 // caching this method should be just fine 811 return false; 812 } 813 814 bool methodOopDesc::is_method_handle_invoke_name(vmSymbols::SID name_sid) { 815 switch (name_sid) { 816 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): // FIXME: remove this transitional form 817 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeExact_name): 818 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeGeneric_name): 819 return true; 820 } 821 return false; 822 } 823 824 // Constant pool structure for invoke methods: 825 enum { 826 _imcp_invoke_name = 1, // utf8: 'invokeExact' or 'invokeGeneric' 827 _imcp_invoke_signature, // utf8: (variable symbolOop) 828 _imcp_method_type_value, // string: (variable java/dyn/MethodType, sic) 829 _imcp_limit 830 }; 831 832 oop methodOopDesc::method_handle_type() const { 833 if (!is_method_handle_invoke()) { assert(false, "caller resp."); return NULL; } 834 oop mt = constants()->resolved_string_at(_imcp_method_type_value); 835 assert(mt->klass() == SystemDictionary::MethodType_klass(), ""); 836 return mt; 837 } 838 839 jint* methodOopDesc::method_type_offsets_chain() { 840 static jint pchase[] = { -1, -1, -1 }; 841 if (pchase[0] == -1) { 842 jint step0 = in_bytes(constants_offset()); 843 jint step1 = (constantPoolOopDesc::header_size() + _imcp_method_type_value) * HeapWordSize; 844 // do this in reverse to avoid races: 845 OrderAccess::release_store(&pchase[1], step1); 846 OrderAccess::release_store(&pchase[0], step0); 847 } 848 return pchase; 849 } 850 851 //------------------------------------------------------------------------------ 852 // methodOopDesc::is_method_handle_adapter 853 // 854 // Tests if this method is an internal adapter frame from the 855 // MethodHandleCompiler. 856 // Must be consistent with MethodHandleCompiler::get_method_oop(). 857 bool methodOopDesc::is_method_handle_adapter() const { 858 return (is_method_handle_invoke_name(name()) && 859 is_synthetic() && 860 MethodHandleCompiler::klass_is_method_handle_adapter_holder(method_holder())); 861 } 862 863 methodHandle methodOopDesc::make_invoke_method(KlassHandle holder, 864 symbolHandle name, 865 symbolHandle signature, 866 Handle method_type, TRAPS) { 867 methodHandle empty; 868 869 assert(holder() == SystemDictionary::MethodHandle_klass(), 870 "must be a JSR 292 magic type"); 871 872 if (TraceMethodHandles) { 873 tty->print("Creating invoke method for "); 874 signature->print_value(); 875 tty->cr(); 876 } 877 878 constantPoolHandle cp; 879 { 880 constantPoolOop cp_oop = oopFactory::new_constantPool(_imcp_limit, IsSafeConc, CHECK_(empty)); 881 cp = constantPoolHandle(THREAD, cp_oop); 882 } 883 cp->symbol_at_put(_imcp_invoke_name, name()); 884 cp->symbol_at_put(_imcp_invoke_signature, signature()); 885 cp->string_at_put(_imcp_method_type_value, vmSymbols::void_signature()); 886 cp->set_pool_holder(holder()); 887 888 // set up the fancy stuff: 889 cp->pseudo_string_at_put(_imcp_method_type_value, method_type()); 890 methodHandle m; 891 { 892 int flags_bits = (JVM_MH_INVOKE_BITS | JVM_ACC_PUBLIC | JVM_ACC_FINAL); 893 methodOop m_oop = oopFactory::new_method(0, accessFlags_from(flags_bits), 894 0, 0, 0, IsSafeConc, CHECK_(empty)); 895 m = methodHandle(THREAD, m_oop); 896 } 897 m->set_constants(cp()); 898 m->set_name_index(_imcp_invoke_name); 899 m->set_signature_index(_imcp_invoke_signature); 900 assert(is_method_handle_invoke_name(m->name()), ""); 901 assert(m->signature() == signature(), ""); 902 #ifdef CC_INTERP 903 ResultTypeFinder rtf(signature()); 904 m->set_result_index(rtf.type()); 905 #endif 906 m->compute_size_of_parameters(THREAD); 907 m->set_exception_table(Universe::the_empty_int_array()); 908 909 // Finally, set up its entry points. 910 assert(m->method_handle_type() == method_type(), ""); 911 assert(m->can_be_statically_bound(), ""); 912 m->set_vtable_index(methodOopDesc::nonvirtual_vtable_index); 913 m->link_method(m, CHECK_(empty)); 914 915 #ifdef ASSERT 916 // Make sure the pointer chase works. 917 address p = (address) m(); 918 for (jint* pchase = method_type_offsets_chain(); (*pchase) != -1; pchase++) { 919 p = *(address*)(p + (*pchase)); 920 } 921 assert((oop)p == method_type(), "pointer chase is correct"); 922 #endif 923 924 if (TraceMethodHandles && (Verbose || WizardMode)) 925 m->print_on(tty); 926 927 return m; 928 } 929 930 931 932 methodHandle methodOopDesc:: clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length, 933 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) { 934 // Code below does not work for native methods - they should never get rewritten anyway 935 assert(!m->is_native(), "cannot rewrite native methods"); 936 // Allocate new methodOop 937 AccessFlags flags = m->access_flags(); 938 int checked_exceptions_len = m->checked_exceptions_length(); 939 int localvariable_len = m->localvariable_table_length(); 940 // Allocate newm_oop with the is_conc_safe parameter set 941 // to IsUnsafeConc to indicate that newm_oop is not yet 942 // safe for concurrent processing by a GC. 943 methodOop newm_oop = oopFactory::new_method(new_code_length, 944 flags, 945 new_compressed_linenumber_size, 946 localvariable_len, 947 checked_exceptions_len, 948 IsUnsafeConc, 949 CHECK_(methodHandle())); 950 methodHandle newm (THREAD, newm_oop); 951 int new_method_size = newm->method_size(); 952 // Create a shallow copy of methodOopDesc part, but be careful to preserve the new constMethodOop 953 constMethodOop newcm = newm->constMethod(); 954 int new_const_method_size = newm->constMethod()->object_size(); 955 956 memcpy(newm(), m(), sizeof(methodOopDesc)); 957 // Create shallow copy of constMethodOopDesc, but be careful to preserve the methodOop 958 // is_conc_safe is set to false because that is the value of 959 // is_conc_safe initialzied into newcm and the copy should 960 // not overwrite that value. During the window during which it is 961 // tagged as unsafe, some extra work could be needed during precleaning 962 // or concurrent marking but those phases will be correct. Setting and 963 // resetting is done in preference to a careful copying into newcm to 964 // avoid having to know the precise layout of a constMethodOop. 965 m->constMethod()->set_is_conc_safe(false); 966 memcpy(newcm, m->constMethod(), sizeof(constMethodOopDesc)); 967 m->constMethod()->set_is_conc_safe(true); 968 // Reset correct method/const method, method size, and parameter info 969 newcm->set_method(newm()); 970 newm->set_constMethod(newcm); 971 assert(newcm->method() == newm(), "check"); 972 newm->constMethod()->set_code_size(new_code_length); 973 newm->constMethod()->set_constMethod_size(new_const_method_size); 974 newm->set_method_size(new_method_size); 975 assert(newm->code_size() == new_code_length, "check"); 976 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check"); 977 assert(newm->localvariable_table_length() == localvariable_len, "check"); 978 // Copy new byte codes 979 memcpy(newm->code_base(), new_code, new_code_length); 980 // Copy line number table 981 if (new_compressed_linenumber_size > 0) { 982 memcpy(newm->compressed_linenumber_table(), 983 new_compressed_linenumber_table, 984 new_compressed_linenumber_size); 985 } 986 // Copy checked_exceptions 987 if (checked_exceptions_len > 0) { 988 memcpy(newm->checked_exceptions_start(), 989 m->checked_exceptions_start(), 990 checked_exceptions_len * sizeof(CheckedExceptionElement)); 991 } 992 // Copy local variable number table 993 if (localvariable_len > 0) { 994 memcpy(newm->localvariable_table_start(), 995 m->localvariable_table_start(), 996 localvariable_len * sizeof(LocalVariableTableElement)); 997 } 998 999 // Only set is_conc_safe to true when changes to newcm are 1000 // complete. 1001 newcm->set_is_conc_safe(true); 1002 return newm; 1003 } 1004 1005 vmSymbols::SID methodOopDesc::klass_id_for_intrinsics(klassOop holder) { 1006 // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics 1007 // because we are not loading from core libraries 1008 if (instanceKlass::cast(holder)->class_loader() != NULL) 1009 return vmSymbols::NO_SID; // regardless of name, no intrinsics here 1010 1011 // see if the klass name is well-known: 1012 symbolOop klass_name = instanceKlass::cast(holder)->name(); 1013 return vmSymbols::find_sid(klass_name); 1014 } 1015 1016 void methodOopDesc::init_intrinsic_id() { 1017 assert(_intrinsic_id == vmIntrinsics::_none, "do this just once"); 1018 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte)); 1019 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size"); 1020 1021 // the klass name is well-known: 1022 vmSymbols::SID klass_id = klass_id_for_intrinsics(method_holder()); 1023 assert(klass_id != vmSymbols::NO_SID, "caller responsibility"); 1024 1025 // ditto for method and signature: 1026 vmSymbols::SID name_id = vmSymbols::find_sid(name()); 1027 if (name_id == vmSymbols::NO_SID) return; 1028 vmSymbols::SID sig_id = vmSymbols::find_sid(signature()); 1029 if (sig_id == vmSymbols::NO_SID) return; 1030 jshort flags = access_flags().as_short(); 1031 1032 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); 1033 if (id != vmIntrinsics::_none) { 1034 set_intrinsic_id(id); 1035 return; 1036 } 1037 1038 // A few slightly irregular cases: 1039 switch (klass_id) { 1040 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_StrictMath): 1041 // Second chance: check in regular Math. 1042 switch (name_id) { 1043 case vmSymbols::VM_SYMBOL_ENUM_NAME(min_name): 1044 case vmSymbols::VM_SYMBOL_ENUM_NAME(max_name): 1045 case vmSymbols::VM_SYMBOL_ENUM_NAME(sqrt_name): 1046 // pretend it is the corresponding method in the non-strict class: 1047 klass_id = vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_Math); 1048 id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); 1049 break; 1050 } 1051 break; 1052 1053 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*. 1054 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_dyn_MethodHandle): 1055 if (is_static() || !is_native()) break; 1056 switch (name_id) { 1057 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeGeneric_name): 1058 id = vmIntrinsics::_invokeGeneric; break; 1059 default: 1060 if (is_method_handle_invoke_name(name())) 1061 id = vmIntrinsics::_invokeExact; 1062 break; 1063 } 1064 break; 1065 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_dyn_InvokeDynamic): 1066 if (!is_static() || !is_native()) break; 1067 id = vmIntrinsics::_invokeDynamic; 1068 break; 1069 } 1070 1071 if (id != vmIntrinsics::_none) { 1072 // Set up its iid. It is an alias method. 1073 set_intrinsic_id(id); 1074 return; 1075 } 1076 } 1077 1078 // These two methods are static since a GC may move the methodOopDesc 1079 bool methodOopDesc::load_signature_classes(methodHandle m, TRAPS) { 1080 bool sig_is_loaded = true; 1081 Handle class_loader(THREAD, instanceKlass::cast(m->method_holder())->class_loader()); 1082 Handle protection_domain(THREAD, Klass::cast(m->method_holder())->protection_domain()); 1083 symbolHandle signature(THREAD, m->signature()); 1084 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) { 1085 if (ss.is_object()) { 1086 symbolOop sym = ss.as_symbol(CHECK_(false)); 1087 symbolHandle name (THREAD, sym); 1088 klassOop klass = SystemDictionary::resolve_or_null(name, class_loader, 1089 protection_domain, THREAD); 1090 // We are loading classes eagerly. If a ClassNotFoundException or 1091 // a LinkageError was generated, be sure to ignore it. 1092 if (HAS_PENDING_EXCEPTION) { 1093 if (PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass()) || 1094 PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) { 1095 CLEAR_PENDING_EXCEPTION; 1096 } else { 1097 return false; 1098 } 1099 } 1100 if( klass == NULL) { sig_is_loaded = false; } 1101 } 1102 } 1103 return sig_is_loaded; 1104 } 1105 1106 bool methodOopDesc::has_unloaded_classes_in_signature(methodHandle m, TRAPS) { 1107 Handle class_loader(THREAD, instanceKlass::cast(m->method_holder())->class_loader()); 1108 Handle protection_domain(THREAD, Klass::cast(m->method_holder())->protection_domain()); 1109 symbolHandle signature(THREAD, m->signature()); 1110 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) { 1111 if (ss.type() == T_OBJECT) { 1112 symbolHandle name(THREAD, ss.as_symbol_or_null()); 1113 if (name() == NULL) return true; 1114 klassOop klass = SystemDictionary::find(name, class_loader, protection_domain, THREAD); 1115 if (klass == NULL) return true; 1116 } 1117 } 1118 return false; 1119 } 1120 1121 // Exposed so field engineers can debug VM 1122 void methodOopDesc::print_short_name(outputStream* st) { 1123 ResourceMark rm; 1124 #ifdef PRODUCT 1125 st->print(" %s::", method_holder()->klass_part()->external_name()); 1126 #else 1127 st->print(" %s::", method_holder()->klass_part()->internal_name()); 1128 #endif 1129 name()->print_symbol_on(st); 1130 if (WizardMode) signature()->print_symbol_on(st); 1131 } 1132 1133 1134 extern "C" { 1135 static int method_compare(methodOop* a, methodOop* b) { 1136 return (*a)->name()->fast_compare((*b)->name()); 1137 } 1138 1139 // Prevent qsort from reordering a previous valid sort by 1140 // considering the address of the methodOops if two methods 1141 // would otherwise compare as equal. Required to preserve 1142 // optimal access order in the shared archive. Slower than 1143 // method_compare, only used for shared archive creation. 1144 static int method_compare_idempotent(methodOop* a, methodOop* b) { 1145 int i = method_compare(a, b); 1146 if (i != 0) return i; 1147 return ( a < b ? -1 : (a == b ? 0 : 1)); 1148 } 1149 1150 // We implement special compare versions for narrow oops to avoid 1151 // testing for UseCompressedOops on every comparison. 1152 static int method_compare_narrow(narrowOop* a, narrowOop* b) { 1153 methodOop m = (methodOop)oopDesc::load_decode_heap_oop(a); 1154 methodOop n = (methodOop)oopDesc::load_decode_heap_oop(b); 1155 return m->name()->fast_compare(n->name()); 1156 } 1157 1158 static int method_compare_narrow_idempotent(narrowOop* a, narrowOop* b) { 1159 int i = method_compare_narrow(a, b); 1160 if (i != 0) return i; 1161 return ( a < b ? -1 : (a == b ? 0 : 1)); 1162 } 1163 1164 typedef int (*compareFn)(const void*, const void*); 1165 } 1166 1167 1168 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array 1169 static void reorder_based_on_method_index(objArrayOop methods, 1170 objArrayOop annotations, 1171 GrowableArray<oop>* temp_array) { 1172 if (annotations == NULL) { 1173 return; 1174 } 1175 1176 int length = methods->length(); 1177 int i; 1178 // Copy to temp array 1179 temp_array->clear(); 1180 for (i = 0; i < length; i++) { 1181 temp_array->append(annotations->obj_at(i)); 1182 } 1183 1184 // Copy back using old method indices 1185 for (i = 0; i < length; i++) { 1186 methodOop m = (methodOop) methods->obj_at(i); 1187 annotations->obj_at_put(i, temp_array->at(m->method_idnum())); 1188 } 1189 } 1190 1191 1192 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array 1193 void methodOopDesc::sort_methods(objArrayOop methods, 1194 objArrayOop methods_annotations, 1195 objArrayOop methods_parameter_annotations, 1196 objArrayOop methods_default_annotations, 1197 bool idempotent) { 1198 int length = methods->length(); 1199 if (length > 1) { 1200 bool do_annotations = false; 1201 if (methods_annotations != NULL || 1202 methods_parameter_annotations != NULL || 1203 methods_default_annotations != NULL) { 1204 do_annotations = true; 1205 } 1206 if (do_annotations) { 1207 // Remember current method ordering so we can reorder annotations 1208 for (int i = 0; i < length; i++) { 1209 methodOop m = (methodOop) methods->obj_at(i); 1210 m->set_method_idnum(i); 1211 } 1212 } 1213 1214 // Use a simple bubble sort for small number of methods since 1215 // qsort requires a functional pointer call for each comparison. 1216 if (length < 8) { 1217 bool sorted = true; 1218 for (int i=length-1; i>0; i--) { 1219 for (int j=0; j<i; j++) { 1220 methodOop m1 = (methodOop)methods->obj_at(j); 1221 methodOop m2 = (methodOop)methods->obj_at(j+1); 1222 if ((uintptr_t)m1->name() > (uintptr_t)m2->name()) { 1223 methods->obj_at_put(j, m2); 1224 methods->obj_at_put(j+1, m1); 1225 sorted = false; 1226 } 1227 } 1228 if (sorted) break; 1229 sorted = true; 1230 } 1231 } else { 1232 compareFn compare = 1233 (UseCompressedOops ? 1234 (compareFn) (idempotent ? method_compare_narrow_idempotent : method_compare_narrow): 1235 (compareFn) (idempotent ? method_compare_idempotent : method_compare)); 1236 qsort(methods->base(), length, heapOopSize, compare); 1237 } 1238 1239 // Sort annotations if necessary 1240 assert(methods_annotations == NULL || methods_annotations->length() == methods->length(), ""); 1241 assert(methods_parameter_annotations == NULL || methods_parameter_annotations->length() == methods->length(), ""); 1242 assert(methods_default_annotations == NULL || methods_default_annotations->length() == methods->length(), ""); 1243 if (do_annotations) { 1244 ResourceMark rm; 1245 // Allocate temporary storage 1246 GrowableArray<oop>* temp_array = new GrowableArray<oop>(length); 1247 reorder_based_on_method_index(methods, methods_annotations, temp_array); 1248 reorder_based_on_method_index(methods, methods_parameter_annotations, temp_array); 1249 reorder_based_on_method_index(methods, methods_default_annotations, temp_array); 1250 } 1251 1252 // Reset method ordering 1253 for (int i = 0; i < length; i++) { 1254 methodOop m = (methodOop) methods->obj_at(i); 1255 m->set_method_idnum(i); 1256 } 1257 } 1258 } 1259 1260 1261 //----------------------------------------------------------------------------------- 1262 // Non-product code 1263 1264 #ifndef PRODUCT 1265 class SignatureTypePrinter : public SignatureTypeNames { 1266 private: 1267 outputStream* _st; 1268 bool _use_separator; 1269 1270 void type_name(const char* name) { 1271 if (_use_separator) _st->print(", "); 1272 _st->print(name); 1273 _use_separator = true; 1274 } 1275 1276 public: 1277 SignatureTypePrinter(symbolHandle signature, outputStream* st) : SignatureTypeNames(signature) { 1278 _st = st; 1279 _use_separator = false; 1280 } 1281 1282 void print_parameters() { _use_separator = false; iterate_parameters(); } 1283 void print_returntype() { _use_separator = false; iterate_returntype(); } 1284 }; 1285 1286 1287 void methodOopDesc::print_name(outputStream* st) { 1288 Thread *thread = Thread::current(); 1289 ResourceMark rm(thread); 1290 SignatureTypePrinter sig(signature(), st); 1291 st->print("%s ", is_static() ? "static" : "virtual"); 1292 sig.print_returntype(); 1293 st->print(" %s.", method_holder()->klass_part()->internal_name()); 1294 name()->print_symbol_on(st); 1295 st->print("("); 1296 sig.print_parameters(); 1297 st->print(")"); 1298 } 1299 1300 1301 void methodOopDesc::print_codes_on(outputStream* st) const { 1302 print_codes_on(0, code_size(), st); 1303 } 1304 1305 void methodOopDesc::print_codes_on(int from, int to, outputStream* st) const { 1306 Thread *thread = Thread::current(); 1307 ResourceMark rm(thread); 1308 methodHandle mh (thread, (methodOop)this); 1309 BytecodeStream s(mh); 1310 s.set_interval(from, to); 1311 BytecodeTracer::set_closure(BytecodeTracer::std_closure()); 1312 while (s.next() >= 0) BytecodeTracer::trace(mh, s.bcp(), st); 1313 } 1314 #endif // not PRODUCT 1315 1316 1317 // Simple compression of line number tables. We use a regular compressed stream, except that we compress deltas 1318 // between (bci,line) pairs since they are smaller. If (bci delta, line delta) fits in (5-bit unsigned, 3-bit unsigned) 1319 // we save it as one byte, otherwise we write a 0xFF escape character and use regular compression. 0x0 is used 1320 // as end-of-stream terminator. 1321 1322 void CompressedLineNumberWriteStream::write_pair_regular(int bci_delta, int line_delta) { 1323 // bci and line number does not compress into single byte. 1324 // Write out escape character and use regular compression for bci and line number. 1325 write_byte((jubyte)0xFF); 1326 write_signed_int(bci_delta); 1327 write_signed_int(line_delta); 1328 } 1329 1330 // See comment in methodOop.hpp which explains why this exists. 1331 #if defined(_M_AMD64) && MSC_VER >= 1400 1332 #pragma optimize("", off) 1333 void CompressedLineNumberWriteStream::write_pair(int bci, int line) { 1334 write_pair_inline(bci, line); 1335 } 1336 #pragma optimize("", on) 1337 #endif 1338 1339 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) { 1340 _bci = 0; 1341 _line = 0; 1342 }; 1343 1344 1345 bool CompressedLineNumberReadStream::read_pair() { 1346 jubyte next = read_byte(); 1347 // Check for terminator 1348 if (next == 0) return false; 1349 if (next == 0xFF) { 1350 // Escape character, regular compression used 1351 _bci += read_signed_int(); 1352 _line += read_signed_int(); 1353 } else { 1354 // Single byte compression used 1355 _bci += next >> 3; 1356 _line += next & 0x7; 1357 } 1358 return true; 1359 } 1360 1361 1362 Bytecodes::Code methodOopDesc::orig_bytecode_at(int bci) { 1363 BreakpointInfo* bp = instanceKlass::cast(method_holder())->breakpoints(); 1364 for (; bp != NULL; bp = bp->next()) { 1365 if (bp->match(this, bci)) { 1366 return bp->orig_bytecode(); 1367 } 1368 } 1369 ShouldNotReachHere(); 1370 return Bytecodes::_shouldnotreachhere; 1371 } 1372 1373 void methodOopDesc::set_orig_bytecode_at(int bci, Bytecodes::Code code) { 1374 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way"); 1375 BreakpointInfo* bp = instanceKlass::cast(method_holder())->breakpoints(); 1376 for (; bp != NULL; bp = bp->next()) { 1377 if (bp->match(this, bci)) { 1378 bp->set_orig_bytecode(code); 1379 // and continue, in case there is more than one 1380 } 1381 } 1382 } 1383 1384 void methodOopDesc::set_breakpoint(int bci) { 1385 instanceKlass* ik = instanceKlass::cast(method_holder()); 1386 BreakpointInfo *bp = new BreakpointInfo(this, bci); 1387 bp->set_next(ik->breakpoints()); 1388 ik->set_breakpoints(bp); 1389 // do this last: 1390 bp->set(this); 1391 } 1392 1393 static void clear_matches(methodOop m, int bci) { 1394 instanceKlass* ik = instanceKlass::cast(m->method_holder()); 1395 BreakpointInfo* prev_bp = NULL; 1396 BreakpointInfo* next_bp; 1397 for (BreakpointInfo* bp = ik->breakpoints(); bp != NULL; bp = next_bp) { 1398 next_bp = bp->next(); 1399 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint). 1400 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) { 1401 // do this first: 1402 bp->clear(m); 1403 // unhook it 1404 if (prev_bp != NULL) 1405 prev_bp->set_next(next_bp); 1406 else 1407 ik->set_breakpoints(next_bp); 1408 delete bp; 1409 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods 1410 // at same location. So we have multiple matching (method_index and bci) 1411 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one 1412 // breakpoint for clear_breakpoint request and keep all other method versions 1413 // BreakpointInfo for future clear_breakpoint request. 1414 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints) 1415 // which is being called when class is unloaded. We delete all the Breakpoint 1416 // information for all versions of method. We may not correctly restore the original 1417 // bytecode in all method versions, but that is ok. Because the class is being unloaded 1418 // so these methods won't be used anymore. 1419 if (bci >= 0) { 1420 break; 1421 } 1422 } else { 1423 // This one is a keeper. 1424 prev_bp = bp; 1425 } 1426 } 1427 } 1428 1429 void methodOopDesc::clear_breakpoint(int bci) { 1430 assert(bci >= 0, ""); 1431 clear_matches(this, bci); 1432 } 1433 1434 void methodOopDesc::clear_all_breakpoints() { 1435 clear_matches(this, -1); 1436 } 1437 1438 1439 BreakpointInfo::BreakpointInfo(methodOop m, int bci) { 1440 _bci = bci; 1441 _name_index = m->name_index(); 1442 _signature_index = m->signature_index(); 1443 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci); 1444 if (_orig_bytecode == Bytecodes::_breakpoint) 1445 _orig_bytecode = m->orig_bytecode_at(_bci); 1446 _next = NULL; 1447 } 1448 1449 void BreakpointInfo::set(methodOop method) { 1450 #ifdef ASSERT 1451 { 1452 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci); 1453 if (code == Bytecodes::_breakpoint) 1454 code = method->orig_bytecode_at(_bci); 1455 assert(orig_bytecode() == code, "original bytecode must be the same"); 1456 } 1457 #endif 1458 *method->bcp_from(_bci) = Bytecodes::_breakpoint; 1459 method->incr_number_of_breakpoints(); 1460 SystemDictionary::notice_modification(); 1461 { 1462 // Deoptimize all dependents on this method 1463 Thread *thread = Thread::current(); 1464 HandleMark hm(thread); 1465 methodHandle mh(thread, method); 1466 Universe::flush_dependents_on_method(mh); 1467 } 1468 } 1469 1470 void BreakpointInfo::clear(methodOop method) { 1471 *method->bcp_from(_bci) = orig_bytecode(); 1472 assert(method->number_of_breakpoints() > 0, "must not go negative"); 1473 method->decr_number_of_breakpoints(); 1474 }