method.cpp revision 6412:53a41e7cbe05
1/* 2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25#include "precompiled.hpp" 26#include "classfile/metadataOnStackMark.hpp" 27#include "classfile/systemDictionary.hpp" 28#include "code/debugInfoRec.hpp" 29#include "gc_interface/collectedHeap.inline.hpp" 30#include "interpreter/bytecodeStream.hpp" 31#include "interpreter/bytecodeTracer.hpp" 32#include "interpreter/bytecodes.hpp" 33#include "interpreter/interpreter.hpp" 34#include "interpreter/oopMapCache.hpp" 35#include "memory/gcLocker.hpp" 36#include "memory/generation.hpp" 37#include "memory/heapInspection.hpp" 38#include "memory/metadataFactory.hpp" 39#include "memory/oopFactory.hpp" 40#include "oops/constMethod.hpp" 41#include "oops/methodData.hpp" 42#include "oops/method.hpp" 43#include "oops/oop.inline.hpp" 44#include "oops/symbol.hpp" 45#include "prims/jvmtiExport.hpp" 46#include "prims/methodHandles.hpp" 47#include "prims/nativeLookup.hpp" 48#include "runtime/arguments.hpp" 49#include "runtime/compilationPolicy.hpp" 50#include "runtime/frame.inline.hpp" 51#include "runtime/handles.inline.hpp" 52#include "runtime/orderAccess.inline.hpp" 53#include "runtime/relocator.hpp" 54#include "runtime/sharedRuntime.hpp" 55#include "runtime/signature.hpp" 56#include "utilities/quickSort.hpp" 57#include "utilities/xmlstream.hpp" 58 59PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC 60 61// Implementation of Method 62 63Method* Method::allocate(ClassLoaderData* loader_data, 64 int byte_code_size, 65 AccessFlags access_flags, 66 InlineTableSizes* sizes, 67 ConstMethod::MethodType method_type, 68 TRAPS) { 69 assert(!access_flags.is_native() || byte_code_size == 0, 70 "native methods should not contain byte codes"); 71 ConstMethod* cm = ConstMethod::allocate(loader_data, 72 byte_code_size, 73 sizes, 74 method_type, 75 CHECK_NULL); 76 77 int size = Method::size(access_flags.is_native()); 78 79 return new (loader_data, size, false, MetaspaceObj::MethodType, THREAD) Method(cm, access_flags, size); 80} 81 82Method::Method(ConstMethod* xconst, AccessFlags access_flags, int size) { 83 No_Safepoint_Verifier no_safepoint; 84 set_constMethod(xconst); 85 set_access_flags(access_flags); 86 set_method_size(size); 87#ifdef CC_INTERP 88 set_result_index(T_VOID); 89#endif 90 set_intrinsic_id(vmIntrinsics::_none); 91 set_jfr_towrite(false); 92 set_force_inline(false); 93 set_hidden(false); 94 set_dont_inline(false); 95 set_method_data(NULL); 96 set_method_counters(NULL); 97 set_vtable_index(Method::garbage_vtable_index); 98 99 // Fix and bury in Method* 100 set_interpreter_entry(NULL); // sets i2i entry and from_int 101 set_adapter_entry(NULL); 102 clear_code(); // from_c/from_i get set to c2i/i2i 103 104 if (access_flags.is_native()) { 105 clear_native_function(); 106 set_signature_handler(NULL); 107 } 108 109 NOT_PRODUCT(set_compiled_invocation_count(0);) 110} 111 112// Release Method*. The nmethod will be gone when we get here because 113// we've walked the code cache. 114void Method::deallocate_contents(ClassLoaderData* loader_data) { 115 MetadataFactory::free_metadata(loader_data, constMethod()); 116 set_constMethod(NULL); 117 MetadataFactory::free_metadata(loader_data, method_data()); 118 set_method_data(NULL); 119 MetadataFactory::free_metadata(loader_data, method_counters()); 120 set_method_counters(NULL); 121 // The nmethod will be gone when we get here. 122 if (code() != NULL) _code = NULL; 123} 124 125address Method::get_i2c_entry() { 126 assert(_adapter != NULL, "must have"); 127 return _adapter->get_i2c_entry(); 128} 129 130address Method::get_c2i_entry() { 131 assert(_adapter != NULL, "must have"); 132 return _adapter->get_c2i_entry(); 133} 134 135address Method::get_c2i_unverified_entry() { 136 assert(_adapter != NULL, "must have"); 137 return _adapter->get_c2i_unverified_entry(); 138} 139 140char* Method::name_and_sig_as_C_string() const { 141 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature()); 142} 143 144char* Method::name_and_sig_as_C_string(char* buf, int size) const { 145 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature(), buf, size); 146} 147 148char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) { 149 const char* klass_name = klass->external_name(); 150 int klass_name_len = (int)strlen(klass_name); 151 int method_name_len = method_name->utf8_length(); 152 int len = klass_name_len + 1 + method_name_len + signature->utf8_length(); 153 char* dest = NEW_RESOURCE_ARRAY(char, len + 1); 154 strcpy(dest, klass_name); 155 dest[klass_name_len] = '.'; 156 strcpy(&dest[klass_name_len + 1], method_name->as_C_string()); 157 strcpy(&dest[klass_name_len + 1 + method_name_len], signature->as_C_string()); 158 dest[len] = 0; 159 return dest; 160} 161 162char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) { 163 Symbol* klass_name = klass->name(); 164 klass_name->as_klass_external_name(buf, size); 165 int len = (int)strlen(buf); 166 167 if (len < size - 1) { 168 buf[len++] = '.'; 169 170 method_name->as_C_string(&(buf[len]), size - len); 171 len = (int)strlen(buf); 172 173 signature->as_C_string(&(buf[len]), size - len); 174 } 175 176 return buf; 177} 178 179int Method::fast_exception_handler_bci_for(methodHandle mh, KlassHandle ex_klass, int throw_bci, TRAPS) { 180 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index) 181 // access exception table 182 ExceptionTable table(mh()); 183 int length = table.length(); 184 // iterate through all entries sequentially 185 constantPoolHandle pool(THREAD, mh->constants()); 186 for (int i = 0; i < length; i ++) { 187 //reacquire the table in case a GC happened 188 ExceptionTable table(mh()); 189 int beg_bci = table.start_pc(i); 190 int end_bci = table.end_pc(i); 191 assert(beg_bci <= end_bci, "inconsistent exception table"); 192 if (beg_bci <= throw_bci && throw_bci < end_bci) { 193 // exception handler bci range covers throw_bci => investigate further 194 int handler_bci = table.handler_pc(i); 195 int klass_index = table.catch_type_index(i); 196 if (klass_index == 0) { 197 return handler_bci; 198 } else if (ex_klass.is_null()) { 199 return handler_bci; 200 } else { 201 // we know the exception class => get the constraint class 202 // this may require loading of the constraint class; if verification 203 // fails or some other exception occurs, return handler_bci 204 Klass* k = pool->klass_at(klass_index, CHECK_(handler_bci)); 205 KlassHandle klass = KlassHandle(THREAD, k); 206 assert(klass.not_null(), "klass not loaded"); 207 if (ex_klass->is_subtype_of(klass())) { 208 return handler_bci; 209 } 210 } 211 } 212 } 213 214 return -1; 215} 216 217void Method::mask_for(int bci, InterpreterOopMap* mask) { 218 219 Thread* myThread = Thread::current(); 220 methodHandle h_this(myThread, this); 221#ifdef ASSERT 222 bool has_capability = myThread->is_VM_thread() || 223 myThread->is_ConcurrentGC_thread() || 224 myThread->is_GC_task_thread(); 225 226 if (!has_capability) { 227 if (!VerifyStack && !VerifyLastFrame) { 228 // verify stack calls this outside VM thread 229 warning("oopmap should only be accessed by the " 230 "VM, GC task or CMS threads (or during debugging)"); 231 InterpreterOopMap local_mask; 232 method_holder()->mask_for(h_this, bci, &local_mask); 233 local_mask.print(); 234 } 235 } 236#endif 237 method_holder()->mask_for(h_this, bci, mask); 238 return; 239} 240 241 242int Method::bci_from(address bcp) const { 243#ifdef ASSERT 244 { ResourceMark rm; 245 assert(is_native() && bcp == code_base() || contains(bcp) || is_error_reported(), 246 err_msg("bcp doesn't belong to this method: bcp: " INTPTR_FORMAT ", method: %s", bcp, name_and_sig_as_C_string())); 247 } 248#endif 249 return bcp - code_base(); 250} 251 252 253// Return (int)bcx if it appears to be a valid BCI. 254// Return bci_from((address)bcx) if it appears to be a valid BCP. 255// Return -1 otherwise. 256// Used by profiling code, when invalid data is a possibility. 257// The caller is responsible for validating the Method* itself. 258int Method::validate_bci_from_bcx(intptr_t bcx) const { 259 // keep bci as -1 if not a valid bci 260 int bci = -1; 261 if (bcx == 0 || (address)bcx == code_base()) { 262 // code_size() may return 0 and we allow 0 here 263 // the method may be native 264 bci = 0; 265 } else if (frame::is_bci(bcx)) { 266 if (bcx < code_size()) { 267 bci = (int)bcx; 268 } 269 } else if (contains((address)bcx)) { 270 bci = (address)bcx - code_base(); 271 } 272 // Assert that if we have dodged any asserts, bci is negative. 273 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0"); 274 return bci; 275} 276 277address Method::bcp_from(int bci) const { 278 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()), err_msg("illegal bci: %d", bci)); 279 address bcp = code_base() + bci; 280 assert(is_native() && bcp == code_base() || contains(bcp), "bcp doesn't belong to this method"); 281 return bcp; 282} 283 284 285int Method::size(bool is_native) { 286 // If native, then include pointers for native_function and signature_handler 287 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0; 288 int extra_words = align_size_up(extra_bytes, BytesPerWord) / BytesPerWord; 289 return align_object_size(header_size() + extra_words); 290} 291 292 293Symbol* Method::klass_name() const { 294 Klass* k = method_holder(); 295 assert(k->is_klass(), "must be klass"); 296 InstanceKlass* ik = (InstanceKlass*) k; 297 return ik->name(); 298} 299 300 301// Attempt to return method oop to original state. Clear any pointers 302// (to objects outside the shared spaces). We won't be able to predict 303// where they should point in a new JVM. Further initialize some 304// entries now in order allow them to be write protected later. 305 306void Method::remove_unshareable_info() { 307 unlink_method(); 308} 309 310 311bool Method::was_executed_more_than(int n) { 312 // Invocation counter is reset when the Method* is compiled. 313 // If the method has compiled code we therefore assume it has 314 // be excuted more than n times. 315 if (is_accessor() || is_empty_method() || (code() != NULL)) { 316 // interpreter doesn't bump invocation counter of trivial methods 317 // compiler does not bump invocation counter of compiled methods 318 return true; 319 } 320 else if ((method_counters() != NULL && 321 method_counters()->invocation_counter()->carry()) || 322 (method_data() != NULL && 323 method_data()->invocation_counter()->carry())) { 324 // The carry bit is set when the counter overflows and causes 325 // a compilation to occur. We don't know how many times 326 // the counter has been reset, so we simply assume it has 327 // been executed more than n times. 328 return true; 329 } else { 330 return invocation_count() > n; 331 } 332} 333 334void Method::print_invocation_count() { 335 if (is_static()) tty->print("static "); 336 if (is_final()) tty->print("final "); 337 if (is_synchronized()) tty->print("synchronized "); 338 if (is_native()) tty->print("native "); 339 tty->print("%s::", method_holder()->external_name()); 340 name()->print_symbol_on(tty); 341 signature()->print_symbol_on(tty); 342 343 if (WizardMode) { 344 // dump the size of the byte codes 345 tty->print(" {%d}", code_size()); 346 } 347 tty->cr(); 348 349 tty->print_cr (" interpreter_invocation_count: %8d ", interpreter_invocation_count()); 350 tty->print_cr (" invocation_counter: %8d ", invocation_count()); 351 tty->print_cr (" backedge_counter: %8d ", backedge_count()); 352#ifndef PRODUCT 353 if (CountCompiledCalls) { 354 tty->print_cr (" compiled_invocation_count: %8d ", compiled_invocation_count()); 355 } 356#endif 357} 358 359// Build a MethodData* object to hold information about this method 360// collected in the interpreter. 361void Method::build_interpreter_method_data(methodHandle method, TRAPS) { 362 // Do not profile method if current thread holds the pending list lock, 363 // which avoids deadlock for acquiring the MethodData_lock. 364 if (InstanceRefKlass::owns_pending_list_lock((JavaThread*)THREAD)) { 365 return; 366 } 367 368 // Grab a lock here to prevent multiple 369 // MethodData*s from being created. 370 MutexLocker ml(MethodData_lock, THREAD); 371 if (method->method_data() == NULL) { 372 ClassLoaderData* loader_data = method->method_holder()->class_loader_data(); 373 MethodData* method_data = MethodData::allocate(loader_data, method, CHECK); 374 method->set_method_data(method_data); 375 if (PrintMethodData && (Verbose || WizardMode)) { 376 ResourceMark rm(THREAD); 377 tty->print("build_interpreter_method_data for "); 378 method->print_name(tty); 379 tty->cr(); 380 // At the end of the run, the MDO, full of data, will be dumped. 381 } 382 } 383} 384 385MethodCounters* Method::build_method_counters(Method* m, TRAPS) { 386 methodHandle mh(m); 387 ClassLoaderData* loader_data = mh->method_holder()->class_loader_data(); 388 MethodCounters* counters = MethodCounters::allocate(loader_data, CHECK_NULL); 389 if (mh->method_counters() == NULL) { 390 mh->set_method_counters(counters); 391 } else { 392 MetadataFactory::free_metadata(loader_data, counters); 393 } 394 return mh->method_counters(); 395} 396 397void Method::cleanup_inline_caches() { 398 // The current system doesn't use inline caches in the interpreter 399 // => nothing to do (keep this method around for future use) 400} 401 402 403int Method::extra_stack_words() { 404 // not an inline function, to avoid a header dependency on Interpreter 405 return extra_stack_entries() * Interpreter::stackElementSize; 406} 407 408 409void Method::compute_size_of_parameters(Thread *thread) { 410 ArgumentSizeComputer asc(signature()); 411 set_size_of_parameters(asc.size() + (is_static() ? 0 : 1)); 412} 413 414#ifdef CC_INTERP 415void Method::set_result_index(BasicType type) { 416 _result_index = Interpreter::BasicType_as_index(type); 417} 418#endif 419 420BasicType Method::result_type() const { 421 ResultTypeFinder rtf(signature()); 422 return rtf.type(); 423} 424 425 426bool Method::is_empty_method() const { 427 return code_size() == 1 428 && *code_base() == Bytecodes::_return; 429} 430 431 432bool Method::is_vanilla_constructor() const { 433 // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method 434 // which only calls the superclass vanilla constructor and possibly does stores of 435 // zero constants to local fields: 436 // 437 // aload_0 438 // invokespecial 439 // indexbyte1 440 // indexbyte2 441 // 442 // followed by an (optional) sequence of: 443 // 444 // aload_0 445 // aconst_null / iconst_0 / fconst_0 / dconst_0 446 // putfield 447 // indexbyte1 448 // indexbyte2 449 // 450 // followed by: 451 // 452 // return 453 454 assert(name() == vmSymbols::object_initializer_name(), "Should only be called for default constructors"); 455 assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors"); 456 int size = code_size(); 457 // Check if size match 458 if (size == 0 || size % 5 != 0) return false; 459 address cb = code_base(); 460 int last = size - 1; 461 if (cb[0] != Bytecodes::_aload_0 || cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) { 462 // Does not call superclass default constructor 463 return false; 464 } 465 // Check optional sequence 466 for (int i = 4; i < last; i += 5) { 467 if (cb[i] != Bytecodes::_aload_0) return false; 468 if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false; 469 if (cb[i+2] != Bytecodes::_putfield) return false; 470 } 471 return true; 472} 473 474 475bool Method::compute_has_loops_flag() { 476 BytecodeStream bcs(this); 477 Bytecodes::Code bc; 478 479 while ((bc = bcs.next()) >= 0) { 480 switch( bc ) { 481 case Bytecodes::_ifeq: 482 case Bytecodes::_ifnull: 483 case Bytecodes::_iflt: 484 case Bytecodes::_ifle: 485 case Bytecodes::_ifne: 486 case Bytecodes::_ifnonnull: 487 case Bytecodes::_ifgt: 488 case Bytecodes::_ifge: 489 case Bytecodes::_if_icmpeq: 490 case Bytecodes::_if_icmpne: 491 case Bytecodes::_if_icmplt: 492 case Bytecodes::_if_icmpgt: 493 case Bytecodes::_if_icmple: 494 case Bytecodes::_if_icmpge: 495 case Bytecodes::_if_acmpeq: 496 case Bytecodes::_if_acmpne: 497 case Bytecodes::_goto: 498 case Bytecodes::_jsr: 499 if( bcs.dest() < bcs.next_bci() ) _access_flags.set_has_loops(); 500 break; 501 502 case Bytecodes::_goto_w: 503 case Bytecodes::_jsr_w: 504 if( bcs.dest_w() < bcs.next_bci() ) _access_flags.set_has_loops(); 505 break; 506 } 507 } 508 _access_flags.set_loops_flag_init(); 509 return _access_flags.has_loops(); 510} 511 512bool Method::is_final_method(AccessFlags class_access_flags) const { 513 // or "does_not_require_vtable_entry" 514 // default method or overpass can occur, is not final (reuses vtable entry) 515 // private methods get vtable entries for backward class compatibility. 516 if (is_overpass() || is_default_method()) return false; 517 return is_final() || class_access_flags.is_final(); 518} 519 520bool Method::is_final_method() const { 521 return is_final_method(method_holder()->access_flags()); 522} 523 524bool Method::is_default_method() const { 525 if (method_holder() != NULL && 526 method_holder()->is_interface() && 527 !is_abstract()) { 528 return true; 529 } else { 530 return false; 531 } 532} 533 534bool Method::can_be_statically_bound(AccessFlags class_access_flags) const { 535 if (is_final_method(class_access_flags)) return true; 536#ifdef ASSERT 537 ResourceMark rm; 538 bool is_nonv = (vtable_index() == nonvirtual_vtable_index); 539 if (class_access_flags.is_interface()) { 540 assert(is_nonv == is_static(), err_msg("is_nonv=%s", name_and_sig_as_C_string())); 541 } 542#endif 543 assert(valid_vtable_index() || valid_itable_index(), "method must be linked before we ask this question"); 544 return vtable_index() == nonvirtual_vtable_index; 545} 546 547bool Method::can_be_statically_bound() const { 548 return can_be_statically_bound(method_holder()->access_flags()); 549} 550 551bool Method::is_accessor() const { 552 if (code_size() != 5) return false; 553 if (size_of_parameters() != 1) return false; 554 if (java_code_at(0) != Bytecodes::_aload_0 ) return false; 555 if (java_code_at(1) != Bytecodes::_getfield) return false; 556 if (java_code_at(4) != Bytecodes::_areturn && 557 java_code_at(4) != Bytecodes::_ireturn ) return false; 558 return true; 559} 560 561 562bool Method::is_initializer() const { 563 return name() == vmSymbols::object_initializer_name() || is_static_initializer(); 564} 565 566bool Method::has_valid_initializer_flags() const { 567 return (is_static() || 568 method_holder()->major_version() < 51); 569} 570 571bool Method::is_static_initializer() const { 572 // For classfiles version 51 or greater, ensure that the clinit method is 573 // static. Non-static methods with the name "<clinit>" are not static 574 // initializers. (older classfiles exempted for backward compatibility) 575 return name() == vmSymbols::class_initializer_name() && 576 has_valid_initializer_flags(); 577} 578 579 580objArrayHandle Method::resolved_checked_exceptions_impl(Method* method, TRAPS) { 581 int length = method->checked_exceptions_length(); 582 if (length == 0) { // common case 583 return objArrayHandle(THREAD, Universe::the_empty_class_klass_array()); 584 } else { 585 methodHandle h_this(THREAD, method); 586 objArrayOop m_oop = oopFactory::new_objArray(SystemDictionary::Class_klass(), length, CHECK_(objArrayHandle())); 587 objArrayHandle mirrors (THREAD, m_oop); 588 for (int i = 0; i < length; i++) { 589 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe 590 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle())); 591 assert(k->is_subclass_of(SystemDictionary::Throwable_klass()), "invalid exception class"); 592 mirrors->obj_at_put(i, k->java_mirror()); 593 } 594 return mirrors; 595 } 596}; 597 598 599int Method::line_number_from_bci(int bci) const { 600 if (bci == SynchronizationEntryBCI) bci = 0; 601 assert(bci == 0 || 0 <= bci && bci < code_size(), "illegal bci"); 602 int best_bci = 0; 603 int best_line = -1; 604 605 if (has_linenumber_table()) { 606 // The line numbers are a short array of 2-tuples [start_pc, line_number]. 607 // Not necessarily sorted and not necessarily one-to-one. 608 CompressedLineNumberReadStream stream(compressed_linenumber_table()); 609 while (stream.read_pair()) { 610 if (stream.bci() == bci) { 611 // perfect match 612 return stream.line(); 613 } else { 614 // update best_bci/line 615 if (stream.bci() < bci && stream.bci() >= best_bci) { 616 best_bci = stream.bci(); 617 best_line = stream.line(); 618 } 619 } 620 } 621 } 622 return best_line; 623} 624 625 626bool Method::is_klass_loaded_by_klass_index(int klass_index) const { 627 if( constants()->tag_at(klass_index).is_unresolved_klass() ) { 628 Thread *thread = Thread::current(); 629 Symbol* klass_name = constants()->klass_name_at(klass_index); 630 Handle loader(thread, method_holder()->class_loader()); 631 Handle prot (thread, method_holder()->protection_domain()); 632 return SystemDictionary::find(klass_name, loader, prot, thread) != NULL; 633 } else { 634 return true; 635 } 636} 637 638 639bool Method::is_klass_loaded(int refinfo_index, bool must_be_resolved) const { 640 int klass_index = constants()->klass_ref_index_at(refinfo_index); 641 if (must_be_resolved) { 642 // Make sure klass is resolved in constantpool. 643 if (constants()->tag_at(klass_index).is_unresolved_klass()) return false; 644 } 645 return is_klass_loaded_by_klass_index(klass_index); 646} 647 648 649void Method::set_native_function(address function, bool post_event_flag) { 650 assert(function != NULL, "use clear_native_function to unregister natives"); 651 assert(!is_method_handle_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), ""); 652 address* native_function = native_function_addr(); 653 654 // We can see racers trying to place the same native function into place. Once 655 // is plenty. 656 address current = *native_function; 657 if (current == function) return; 658 if (post_event_flag && JvmtiExport::should_post_native_method_bind() && 659 function != NULL) { 660 // native_method_throw_unsatisfied_link_error_entry() should only 661 // be passed when post_event_flag is false. 662 assert(function != 663 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 664 "post_event_flag mis-match"); 665 666 // post the bind event, and possible change the bind function 667 JvmtiExport::post_native_method_bind(this, &function); 668 } 669 *native_function = function; 670 // This function can be called more than once. We must make sure that we always 671 // use the latest registered method -> check if a stub already has been generated. 672 // If so, we have to make it not_entrant. 673 nmethod* nm = code(); // Put it into local variable to guard against concurrent updates 674 if (nm != NULL) { 675 nm->make_not_entrant(); 676 } 677} 678 679 680bool Method::has_native_function() const { 681 if (is_method_handle_intrinsic()) 682 return false; // special-cased in SharedRuntime::generate_native_wrapper 683 address func = native_function(); 684 return (func != NULL && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry()); 685} 686 687 688void Method::clear_native_function() { 689 // Note: is_method_handle_intrinsic() is allowed here. 690 set_native_function( 691 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 692 !native_bind_event_is_interesting); 693 clear_code(); 694} 695 696address Method::critical_native_function() { 697 methodHandle mh(this); 698 return NativeLookup::lookup_critical_entry(mh); 699} 700 701 702void Method::set_signature_handler(address handler) { 703 address* signature_handler = signature_handler_addr(); 704 *signature_handler = handler; 705} 706 707 708void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) { 709 if (PrintCompilation && report) { 710 ttyLocker ttyl; 711 tty->print("made not %scompilable on ", is_osr ? "OSR " : ""); 712 if (comp_level == CompLevel_all) { 713 tty->print("all levels "); 714 } else { 715 tty->print("levels "); 716 for (int i = (int)CompLevel_none; i <= comp_level; i++) { 717 tty->print("%d ", i); 718 } 719 } 720 this->print_short_name(tty); 721 int size = this->code_size(); 722 if (size > 0) { 723 tty->print(" (%d bytes)", size); 724 } 725 if (reason != NULL) { 726 tty->print(" %s", reason); 727 } 728 tty->cr(); 729 } 730 if ((TraceDeoptimization || LogCompilation) && (xtty != NULL)) { 731 ttyLocker ttyl; 732 xtty->begin_elem("make_not_%scompilable thread='" UINTX_FORMAT "'", 733 is_osr ? "osr_" : "", os::current_thread_id()); 734 if (reason != NULL) { 735 xtty->print(" reason=\'%s\'", reason); 736 } 737 xtty->method(this); 738 xtty->stamp(); 739 xtty->end_elem(); 740 } 741} 742 743bool Method::is_always_compilable() const { 744 // Generated adapters must be compiled 745 if (is_method_handle_intrinsic() && is_synthetic()) { 746 assert(!is_not_c1_compilable(), "sanity check"); 747 assert(!is_not_c2_compilable(), "sanity check"); 748 return true; 749 } 750 751 return false; 752} 753 754bool Method::is_not_compilable(int comp_level) const { 755 if (number_of_breakpoints() > 0) 756 return true; 757 if (is_always_compilable()) 758 return false; 759 if (comp_level == CompLevel_any) 760 return is_not_c1_compilable() || is_not_c2_compilable(); 761 if (is_c1_compile(comp_level)) 762 return is_not_c1_compilable(); 763 if (is_c2_compile(comp_level)) 764 return is_not_c2_compilable(); 765 return false; 766} 767 768// call this when compiler finds that this method is not compilable 769void Method::set_not_compilable(int comp_level, bool report, const char* reason) { 770 if (is_always_compilable()) { 771 // Don't mark a method which should be always compilable 772 return; 773 } 774 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason); 775 if (comp_level == CompLevel_all) { 776 set_not_c1_compilable(); 777 set_not_c2_compilable(); 778 } else { 779 if (is_c1_compile(comp_level)) 780 set_not_c1_compilable(); 781 if (is_c2_compile(comp_level)) 782 set_not_c2_compilable(); 783 } 784 CompilationPolicy::policy()->disable_compilation(this); 785 assert(!CompilationPolicy::can_be_compiled(this, comp_level), "sanity check"); 786} 787 788bool Method::is_not_osr_compilable(int comp_level) const { 789 if (is_not_compilable(comp_level)) 790 return true; 791 if (comp_level == CompLevel_any) 792 return is_not_c1_osr_compilable() || is_not_c2_osr_compilable(); 793 if (is_c1_compile(comp_level)) 794 return is_not_c1_osr_compilable(); 795 if (is_c2_compile(comp_level)) 796 return is_not_c2_osr_compilable(); 797 return false; 798} 799 800void Method::set_not_osr_compilable(int comp_level, bool report, const char* reason) { 801 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason); 802 if (comp_level == CompLevel_all) { 803 set_not_c1_osr_compilable(); 804 set_not_c2_osr_compilable(); 805 } else { 806 if (is_c1_compile(comp_level)) 807 set_not_c1_osr_compilable(); 808 if (is_c2_compile(comp_level)) 809 set_not_c2_osr_compilable(); 810 } 811 CompilationPolicy::policy()->disable_compilation(this); 812 assert(!CompilationPolicy::can_be_osr_compiled(this, comp_level), "sanity check"); 813} 814 815// Revert to using the interpreter and clear out the nmethod 816void Method::clear_code() { 817 818 // this may be NULL if c2i adapters have not been made yet 819 // Only should happen at allocate time. 820 if (_adapter == NULL) { 821 _from_compiled_entry = NULL; 822 } else { 823 _from_compiled_entry = _adapter->get_c2i_entry(); 824 } 825 OrderAccess::storestore(); 826 _from_interpreted_entry = _i2i_entry; 827 OrderAccess::storestore(); 828 _code = NULL; 829} 830 831// Called by class data sharing to remove any entry points (which are not shared) 832void Method::unlink_method() { 833 _code = NULL; 834 _i2i_entry = NULL; 835 _from_interpreted_entry = NULL; 836 if (is_native()) { 837 *native_function_addr() = NULL; 838 set_signature_handler(NULL); 839 } 840 NOT_PRODUCT(set_compiled_invocation_count(0);) 841 _adapter = NULL; 842 _from_compiled_entry = NULL; 843 844 // In case of DumpSharedSpaces, _method_data should always be NULL. 845 // 846 // During runtime (!DumpSharedSpaces), when we are cleaning a 847 // shared class that failed to load, this->link_method() may 848 // have already been called (before an exception happened), so 849 // this->_method_data may not be NULL. 850 assert(!DumpSharedSpaces || _method_data == NULL, "unexpected method data?"); 851 852 set_method_data(NULL); 853 set_method_counters(NULL); 854} 855 856// Called when the method_holder is getting linked. Setup entrypoints so the method 857// is ready to be called from interpreter, compiler, and vtables. 858void Method::link_method(methodHandle h_method, TRAPS) { 859 // If the code cache is full, we may reenter this function for the 860 // leftover methods that weren't linked. 861 if (_i2i_entry != NULL) return; 862 863 assert(_adapter == NULL, "init'd to NULL" ); 864 assert( _code == NULL, "nothing compiled yet" ); 865 866 // Setup interpreter entrypoint 867 assert(this == h_method(), "wrong h_method()" ); 868 address entry = Interpreter::entry_for_method(h_method); 869 assert(entry != NULL, "interpreter entry must be non-null"); 870 // Sets both _i2i_entry and _from_interpreted_entry 871 set_interpreter_entry(entry); 872 873 // Don't overwrite already registered native entries. 874 if (is_native() && !has_native_function()) { 875 set_native_function( 876 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 877 !native_bind_event_is_interesting); 878 } 879 880 // Setup compiler entrypoint. This is made eagerly, so we do not need 881 // special handling of vtables. An alternative is to make adapters more 882 // lazily by calling make_adapter() from from_compiled_entry() for the 883 // normal calls. For vtable calls life gets more complicated. When a 884 // call-site goes mega-morphic we need adapters in all methods which can be 885 // called from the vtable. We need adapters on such methods that get loaded 886 // later. Ditto for mega-morphic itable calls. If this proves to be a 887 // problem we'll make these lazily later. 888 (void) make_adapters(h_method, CHECK); 889 890 // ONLY USE the h_method now as make_adapter may have blocked 891 892} 893 894address Method::make_adapters(methodHandle mh, TRAPS) { 895 // Adapters for compiled code are made eagerly here. They are fairly 896 // small (generally < 100 bytes) and quick to make (and cached and shared) 897 // so making them eagerly shouldn't be too expensive. 898 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh); 899 if (adapter == NULL ) { 900 THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "out of space in CodeCache for adapters"); 901 } 902 903 mh->set_adapter_entry(adapter); 904 mh->_from_compiled_entry = adapter->get_c2i_entry(); 905 return adapter->get_c2i_entry(); 906} 907 908void Method::restore_unshareable_info(TRAPS) { 909 // Since restore_unshareable_info can be called more than once for a method, don't 910 // redo any work. If this field is restored, there is nothing to do. 911 if (_from_compiled_entry == NULL) { 912 // restore method's vtable by calling a virtual function 913 restore_vtable(); 914 915 methodHandle mh(THREAD, this); 916 link_method(mh, CHECK); 917 } 918} 919 920 921// The verified_code_entry() must be called when a invoke is resolved 922// on this method. 923 924// It returns the compiled code entry point, after asserting not null. 925// This function is called after potential safepoints so that nmethod 926// or adapter that it points to is still live and valid. 927// This function must not hit a safepoint! 928address Method::verified_code_entry() { 929 debug_only(No_Safepoint_Verifier nsv;) 930 assert(_from_compiled_entry != NULL, "must be set"); 931 return _from_compiled_entry; 932} 933 934// Check that if an nmethod ref exists, it has a backlink to this or no backlink at all 935// (could be racing a deopt). 936// Not inline to avoid circular ref. 937bool Method::check_code() const { 938 // cached in a register or local. There's a race on the value of the field. 939 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code); 940 return code == NULL || (code->method() == NULL) || (code->method() == (Method*)this && !code->is_osr_method()); 941} 942 943// Install compiled code. Instantly it can execute. 944void Method::set_code(methodHandle mh, nmethod *code) { 945 assert( code, "use clear_code to remove code" ); 946 assert( mh->check_code(), "" ); 947 948 guarantee(mh->adapter() != NULL, "Adapter blob must already exist!"); 949 950 // These writes must happen in this order, because the interpreter will 951 // directly jump to from_interpreted_entry which jumps to an i2c adapter 952 // which jumps to _from_compiled_entry. 953 mh->_code = code; // Assign before allowing compiled code to exec 954 955 int comp_level = code->comp_level(); 956 // In theory there could be a race here. In practice it is unlikely 957 // and not worth worrying about. 958 if (comp_level > mh->highest_comp_level()) { 959 mh->set_highest_comp_level(comp_level); 960 } 961 962 OrderAccess::storestore(); 963#ifdef SHARK 964 mh->_from_interpreted_entry = code->insts_begin(); 965#else //!SHARK 966 mh->_from_compiled_entry = code->verified_entry_point(); 967 OrderAccess::storestore(); 968 // Instantly compiled code can execute. 969 if (!mh->is_method_handle_intrinsic()) 970 mh->_from_interpreted_entry = mh->get_i2c_entry(); 971#endif //!SHARK 972} 973 974 975bool Method::is_overridden_in(Klass* k) const { 976 InstanceKlass* ik = InstanceKlass::cast(k); 977 978 if (ik->is_interface()) return false; 979 980 // If method is an interface, we skip it - except if it 981 // is a miranda method 982 if (method_holder()->is_interface()) { 983 // Check that method is not a miranda method 984 if (ik->lookup_method(name(), signature()) == NULL) { 985 // No implementation exist - so miranda method 986 return false; 987 } 988 return true; 989 } 990 991 assert(ik->is_subclass_of(method_holder()), "should be subklass"); 992 assert(ik->vtable() != NULL, "vtable should exist"); 993 if (!has_vtable_index()) { 994 return false; 995 } else { 996 Method* vt_m = ik->method_at_vtable(vtable_index()); 997 return vt_m != this; 998 } 999} 1000 1001 1002// give advice about whether this Method* should be cached or not 1003bool Method::should_not_be_cached() const { 1004 if (is_old()) { 1005 // This method has been redefined. It is either EMCP or obsolete 1006 // and we don't want to cache it because that would pin the method 1007 // down and prevent it from being collectible if and when it 1008 // finishes executing. 1009 return true; 1010 } 1011 1012 // caching this method should be just fine 1013 return false; 1014} 1015 1016 1017/** 1018 * Returns true if this is one of the specially treated methods for 1019 * security related stack walks (like Reflection.getCallerClass). 1020 */ 1021bool Method::is_ignored_by_security_stack_walk() const { 1022 const bool use_new_reflection = JDK_Version::is_gte_jdk14x_version() && UseNewReflection; 1023 1024 if (intrinsic_id() == vmIntrinsics::_invoke) { 1025 // This is Method.invoke() -- ignore it 1026 return true; 1027 } 1028 if (use_new_reflection && 1029 method_holder()->is_subclass_of(SystemDictionary::reflect_MethodAccessorImpl_klass())) { 1030 // This is an auxilary frame -- ignore it 1031 return true; 1032 } 1033 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) { 1034 // This is an internal adapter frame for method handles -- ignore it 1035 return true; 1036 } 1037 return false; 1038} 1039 1040 1041// Constant pool structure for invoke methods: 1042enum { 1043 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc. 1044 _imcp_invoke_signature, // utf8: (variable Symbol*) 1045 _imcp_limit 1046}; 1047 1048// Test if this method is an MH adapter frame generated by Java code. 1049// Cf. java/lang/invoke/InvokerBytecodeGenerator 1050bool Method::is_compiled_lambda_form() const { 1051 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm; 1052} 1053 1054// Test if this method is an internal MH primitive method. 1055bool Method::is_method_handle_intrinsic() const { 1056 vmIntrinsics::ID iid = intrinsic_id(); 1057 return (MethodHandles::is_signature_polymorphic(iid) && 1058 MethodHandles::is_signature_polymorphic_intrinsic(iid)); 1059} 1060 1061bool Method::has_member_arg() const { 1062 vmIntrinsics::ID iid = intrinsic_id(); 1063 return (MethodHandles::is_signature_polymorphic(iid) && 1064 MethodHandles::has_member_arg(iid)); 1065} 1066 1067// Make an instance of a signature-polymorphic internal MH primitive. 1068methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid, 1069 Symbol* signature, 1070 TRAPS) { 1071 ResourceMark rm; 1072 methodHandle empty; 1073 1074 KlassHandle holder = SystemDictionary::MethodHandle_klass(); 1075 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid); 1076 assert(iid == MethodHandles::signature_polymorphic_name_id(name), ""); 1077 if (TraceMethodHandles) { 1078 tty->print_cr("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string()); 1079 } 1080 1081 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup) 1082 name->increment_refcount(); 1083 signature->increment_refcount(); 1084 1085 int cp_length = _imcp_limit; 1086 ClassLoaderData* loader_data = holder->class_loader_data(); 1087 constantPoolHandle cp; 1088 { 1089 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty)); 1090 cp = constantPoolHandle(THREAD, cp_oop); 1091 } 1092 cp->set_pool_holder(InstanceKlass::cast(holder())); 1093 cp->symbol_at_put(_imcp_invoke_name, name); 1094 cp->symbol_at_put(_imcp_invoke_signature, signature); 1095 cp->set_has_preresolution(); 1096 1097 // decide on access bits: public or not? 1098 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL); 1099 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid); 1100 if (must_be_static) flags_bits |= JVM_ACC_STATIC; 1101 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods"); 1102 1103 methodHandle m; 1104 { 1105 InlineTableSizes sizes; 1106 Method* m_oop = Method::allocate(loader_data, 0, 1107 accessFlags_from(flags_bits), &sizes, 1108 ConstMethod::NORMAL, CHECK_(empty)); 1109 m = methodHandle(THREAD, m_oop); 1110 } 1111 m->set_constants(cp()); 1112 m->set_name_index(_imcp_invoke_name); 1113 m->set_signature_index(_imcp_invoke_signature); 1114 assert(MethodHandles::is_signature_polymorphic_name(m->name()), ""); 1115 assert(m->signature() == signature, ""); 1116#ifdef CC_INTERP 1117 ResultTypeFinder rtf(signature); 1118 m->set_result_index(rtf.type()); 1119#endif 1120 m->compute_size_of_parameters(THREAD); 1121 m->init_intrinsic_id(); 1122 assert(m->is_method_handle_intrinsic(), ""); 1123#ifdef ASSERT 1124 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print(); 1125 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker"); 1126 assert(m->intrinsic_id() == iid, "correctly predicted iid"); 1127#endif //ASSERT 1128 1129 // Finally, set up its entry points. 1130 assert(m->can_be_statically_bound(), ""); 1131 m->set_vtable_index(Method::nonvirtual_vtable_index); 1132 m->link_method(m, CHECK_(empty)); 1133 1134 if (TraceMethodHandles && (Verbose || WizardMode)) 1135 m->print_on(tty); 1136 1137 return m; 1138} 1139 1140Klass* Method::check_non_bcp_klass(Klass* klass) { 1141 if (klass != NULL && klass->class_loader() != NULL) { 1142 if (klass->oop_is_objArray()) 1143 klass = ObjArrayKlass::cast(klass)->bottom_klass(); 1144 return klass; 1145 } 1146 return NULL; 1147} 1148 1149 1150methodHandle Method::clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length, 1151 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) { 1152 // Code below does not work for native methods - they should never get rewritten anyway 1153 assert(!m->is_native(), "cannot rewrite native methods"); 1154 // Allocate new Method* 1155 AccessFlags flags = m->access_flags(); 1156 1157 ConstMethod* cm = m->constMethod(); 1158 int checked_exceptions_len = cm->checked_exceptions_length(); 1159 int localvariable_len = cm->localvariable_table_length(); 1160 int exception_table_len = cm->exception_table_length(); 1161 int method_parameters_len = cm->method_parameters_length(); 1162 int method_annotations_len = cm->method_annotations_length(); 1163 int parameter_annotations_len = cm->parameter_annotations_length(); 1164 int type_annotations_len = cm->type_annotations_length(); 1165 int default_annotations_len = cm->default_annotations_length(); 1166 1167 InlineTableSizes sizes( 1168 localvariable_len, 1169 new_compressed_linenumber_size, 1170 exception_table_len, 1171 checked_exceptions_len, 1172 method_parameters_len, 1173 cm->generic_signature_index(), 1174 method_annotations_len, 1175 parameter_annotations_len, 1176 type_annotations_len, 1177 default_annotations_len, 1178 0); 1179 1180 ClassLoaderData* loader_data = m->method_holder()->class_loader_data(); 1181 Method* newm_oop = Method::allocate(loader_data, 1182 new_code_length, 1183 flags, 1184 &sizes, 1185 m->method_type(), 1186 CHECK_(methodHandle())); 1187 methodHandle newm (THREAD, newm_oop); 1188 int new_method_size = newm->method_size(); 1189 1190 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod* 1191 ConstMethod* newcm = newm->constMethod(); 1192 int new_const_method_size = newm->constMethod()->size(); 1193 1194 memcpy(newm(), m(), sizeof(Method)); 1195 1196 // Create shallow copy of ConstMethod. 1197 memcpy(newcm, m->constMethod(), sizeof(ConstMethod)); 1198 1199 // Reset correct method/const method, method size, and parameter info 1200 newm->set_constMethod(newcm); 1201 newm->constMethod()->set_code_size(new_code_length); 1202 newm->constMethod()->set_constMethod_size(new_const_method_size); 1203 newm->set_method_size(new_method_size); 1204 assert(newm->code_size() == new_code_length, "check"); 1205 assert(newm->method_parameters_length() == method_parameters_len, "check"); 1206 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check"); 1207 assert(newm->exception_table_length() == exception_table_len, "check"); 1208 assert(newm->localvariable_table_length() == localvariable_len, "check"); 1209 // Copy new byte codes 1210 memcpy(newm->code_base(), new_code, new_code_length); 1211 // Copy line number table 1212 if (new_compressed_linenumber_size > 0) { 1213 memcpy(newm->compressed_linenumber_table(), 1214 new_compressed_linenumber_table, 1215 new_compressed_linenumber_size); 1216 } 1217 // Copy method_parameters 1218 if (method_parameters_len > 0) { 1219 memcpy(newm->method_parameters_start(), 1220 m->method_parameters_start(), 1221 method_parameters_len * sizeof(MethodParametersElement)); 1222 } 1223 // Copy checked_exceptions 1224 if (checked_exceptions_len > 0) { 1225 memcpy(newm->checked_exceptions_start(), 1226 m->checked_exceptions_start(), 1227 checked_exceptions_len * sizeof(CheckedExceptionElement)); 1228 } 1229 // Copy exception table 1230 if (exception_table_len > 0) { 1231 memcpy(newm->exception_table_start(), 1232 m->exception_table_start(), 1233 exception_table_len * sizeof(ExceptionTableElement)); 1234 } 1235 // Copy local variable number table 1236 if (localvariable_len > 0) { 1237 memcpy(newm->localvariable_table_start(), 1238 m->localvariable_table_start(), 1239 localvariable_len * sizeof(LocalVariableTableElement)); 1240 } 1241 // Copy stackmap table 1242 if (m->has_stackmap_table()) { 1243 int code_attribute_length = m->stackmap_data()->length(); 1244 Array<u1>* stackmap_data = 1245 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_NULL); 1246 memcpy((void*)stackmap_data->adr_at(0), 1247 (void*)m->stackmap_data()->adr_at(0), code_attribute_length); 1248 newm->set_stackmap_data(stackmap_data); 1249 } 1250 1251 // copy annotations over to new method 1252 newcm->copy_annotations_from(cm); 1253 return newm; 1254} 1255 1256vmSymbols::SID Method::klass_id_for_intrinsics(Klass* holder) { 1257 // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics 1258 // because we are not loading from core libraries 1259 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar 1260 // which does not use the class default class loader so we check for its loader here 1261 InstanceKlass* ik = InstanceKlass::cast(holder); 1262 if ((ik->class_loader() != NULL) && !SystemDictionary::is_ext_class_loader(ik->class_loader())) { 1263 return vmSymbols::NO_SID; // regardless of name, no intrinsics here 1264 } 1265 1266 // see if the klass name is well-known: 1267 Symbol* klass_name = ik->name(); 1268 return vmSymbols::find_sid(klass_name); 1269} 1270 1271void Method::init_intrinsic_id() { 1272 assert(_intrinsic_id == vmIntrinsics::_none, "do this just once"); 1273 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte)); 1274 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size"); 1275 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), ""); 1276 1277 // the klass name is well-known: 1278 vmSymbols::SID klass_id = klass_id_for_intrinsics(method_holder()); 1279 assert(klass_id != vmSymbols::NO_SID, "caller responsibility"); 1280 1281 // ditto for method and signature: 1282 vmSymbols::SID name_id = vmSymbols::find_sid(name()); 1283 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) 1284 && name_id == vmSymbols::NO_SID) 1285 return; 1286 vmSymbols::SID sig_id = vmSymbols::find_sid(signature()); 1287 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) 1288 && sig_id == vmSymbols::NO_SID) return; 1289 jshort flags = access_flags().as_short(); 1290 1291 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); 1292 if (id != vmIntrinsics::_none) { 1293 set_intrinsic_id(id); 1294 return; 1295 } 1296 1297 // A few slightly irregular cases: 1298 switch (klass_id) { 1299 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_StrictMath): 1300 // Second chance: check in regular Math. 1301 switch (name_id) { 1302 case vmSymbols::VM_SYMBOL_ENUM_NAME(min_name): 1303 case vmSymbols::VM_SYMBOL_ENUM_NAME(max_name): 1304 case vmSymbols::VM_SYMBOL_ENUM_NAME(sqrt_name): 1305 // pretend it is the corresponding method in the non-strict class: 1306 klass_id = vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_Math); 1307 id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); 1308 break; 1309 } 1310 break; 1311 1312 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*. 1313 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle): 1314 if (!is_native()) break; 1315 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name()); 1316 if (is_static() != MethodHandles::is_signature_polymorphic_static(id)) 1317 id = vmIntrinsics::_none; 1318 break; 1319 } 1320 1321 if (id != vmIntrinsics::_none) { 1322 // Set up its iid. It is an alias method. 1323 set_intrinsic_id(id); 1324 return; 1325 } 1326} 1327 1328// These two methods are static since a GC may move the Method 1329bool Method::load_signature_classes(methodHandle m, TRAPS) { 1330 if (THREAD->is_Compiler_thread()) { 1331 // There is nothing useful this routine can do from within the Compile thread. 1332 // Hopefully, the signature contains only well-known classes. 1333 // We could scan for this and return true/false, but the caller won't care. 1334 return false; 1335 } 1336 bool sig_is_loaded = true; 1337 Handle class_loader(THREAD, m->method_holder()->class_loader()); 1338 Handle protection_domain(THREAD, m->method_holder()->protection_domain()); 1339 ResourceMark rm(THREAD); 1340 Symbol* signature = m->signature(); 1341 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) { 1342 if (ss.is_object()) { 1343 Symbol* sym = ss.as_symbol(CHECK_(false)); 1344 Symbol* name = sym; 1345 Klass* klass = SystemDictionary::resolve_or_null(name, class_loader, 1346 protection_domain, THREAD); 1347 // We are loading classes eagerly. If a ClassNotFoundException or 1348 // a LinkageError was generated, be sure to ignore it. 1349 if (HAS_PENDING_EXCEPTION) { 1350 if (PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass()) || 1351 PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) { 1352 CLEAR_PENDING_EXCEPTION; 1353 } else { 1354 return false; 1355 } 1356 } 1357 if( klass == NULL) { sig_is_loaded = false; } 1358 } 1359 } 1360 return sig_is_loaded; 1361} 1362 1363bool Method::has_unloaded_classes_in_signature(methodHandle m, TRAPS) { 1364 Handle class_loader(THREAD, m->method_holder()->class_loader()); 1365 Handle protection_domain(THREAD, m->method_holder()->protection_domain()); 1366 ResourceMark rm(THREAD); 1367 Symbol* signature = m->signature(); 1368 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) { 1369 if (ss.type() == T_OBJECT) { 1370 Symbol* name = ss.as_symbol_or_null(); 1371 if (name == NULL) return true; 1372 Klass* klass = SystemDictionary::find(name, class_loader, protection_domain, THREAD); 1373 if (klass == NULL) return true; 1374 } 1375 } 1376 return false; 1377} 1378 1379// Exposed so field engineers can debug VM 1380void Method::print_short_name(outputStream* st) { 1381 ResourceMark rm; 1382#ifdef PRODUCT 1383 st->print(" %s::", method_holder()->external_name()); 1384#else 1385 st->print(" %s::", method_holder()->internal_name()); 1386#endif 1387 name()->print_symbol_on(st); 1388 if (WizardMode) signature()->print_symbol_on(st); 1389 else if (MethodHandles::is_signature_polymorphic(intrinsic_id())) 1390 MethodHandles::print_as_basic_type_signature_on(st, signature(), true); 1391} 1392 1393// Comparer for sorting an object array containing 1394// Method*s. 1395static int method_comparator(Method* a, Method* b) { 1396 return a->name()->fast_compare(b->name()); 1397} 1398 1399// This is only done during class loading, so it is OK to assume method_idnum matches the methods() array 1400// default_methods also uses this without the ordering for fast find_method 1401void Method::sort_methods(Array<Method*>* methods, bool idempotent, bool set_idnums) { 1402 int length = methods->length(); 1403 if (length > 1) { 1404 { 1405 No_Safepoint_Verifier nsv; 1406 QuickSort::sort<Method*>(methods->data(), length, method_comparator, idempotent); 1407 } 1408 // Reset method ordering 1409 if (set_idnums) { 1410 for (int i = 0; i < length; i++) { 1411 Method* m = methods->at(i); 1412 m->set_method_idnum(i); 1413 } 1414 } 1415 } 1416} 1417 1418//----------------------------------------------------------------------------------- 1419// Non-product code unless JVM/TI needs it 1420 1421#if !defined(PRODUCT) || INCLUDE_JVMTI 1422class SignatureTypePrinter : public SignatureTypeNames { 1423 private: 1424 outputStream* _st; 1425 bool _use_separator; 1426 1427 void type_name(const char* name) { 1428 if (_use_separator) _st->print(", "); 1429 _st->print("%s", name); 1430 _use_separator = true; 1431 } 1432 1433 public: 1434 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) { 1435 _st = st; 1436 _use_separator = false; 1437 } 1438 1439 void print_parameters() { _use_separator = false; iterate_parameters(); } 1440 void print_returntype() { _use_separator = false; iterate_returntype(); } 1441}; 1442 1443 1444void Method::print_name(outputStream* st) { 1445 Thread *thread = Thread::current(); 1446 ResourceMark rm(thread); 1447 SignatureTypePrinter sig(signature(), st); 1448 st->print("%s ", is_static() ? "static" : "virtual"); 1449 sig.print_returntype(); 1450 st->print(" %s.", method_holder()->internal_name()); 1451 name()->print_symbol_on(st); 1452 st->print("("); 1453 sig.print_parameters(); 1454 st->print(")"); 1455} 1456#endif // !PRODUCT || INCLUDE_JVMTI 1457 1458 1459void Method::print_codes_on(outputStream* st) const { 1460 print_codes_on(0, code_size(), st); 1461} 1462 1463void Method::print_codes_on(int from, int to, outputStream* st) const { 1464 Thread *thread = Thread::current(); 1465 ResourceMark rm(thread); 1466 methodHandle mh (thread, (Method*)this); 1467 BytecodeStream s(mh); 1468 s.set_interval(from, to); 1469 BytecodeTracer::set_closure(BytecodeTracer::std_closure()); 1470 while (s.next() >= 0) BytecodeTracer::trace(mh, s.bcp(), st); 1471} 1472 1473 1474// Simple compression of line number tables. We use a regular compressed stream, except that we compress deltas 1475// between (bci,line) pairs since they are smaller. If (bci delta, line delta) fits in (5-bit unsigned, 3-bit unsigned) 1476// we save it as one byte, otherwise we write a 0xFF escape character and use regular compression. 0x0 is used 1477// as end-of-stream terminator. 1478 1479void CompressedLineNumberWriteStream::write_pair_regular(int bci_delta, int line_delta) { 1480 // bci and line number does not compress into single byte. 1481 // Write out escape character and use regular compression for bci and line number. 1482 write_byte((jubyte)0xFF); 1483 write_signed_int(bci_delta); 1484 write_signed_int(line_delta); 1485} 1486 1487// See comment in method.hpp which explains why this exists. 1488#if defined(_M_AMD64) && _MSC_VER >= 1400 1489#pragma optimize("", off) 1490void CompressedLineNumberWriteStream::write_pair(int bci, int line) { 1491 write_pair_inline(bci, line); 1492} 1493#pragma optimize("", on) 1494#endif 1495 1496CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) { 1497 _bci = 0; 1498 _line = 0; 1499}; 1500 1501 1502bool CompressedLineNumberReadStream::read_pair() { 1503 jubyte next = read_byte(); 1504 // Check for terminator 1505 if (next == 0) return false; 1506 if (next == 0xFF) { 1507 // Escape character, regular compression used 1508 _bci += read_signed_int(); 1509 _line += read_signed_int(); 1510 } else { 1511 // Single byte compression used 1512 _bci += next >> 3; 1513 _line += next & 0x7; 1514 } 1515 return true; 1516} 1517 1518 1519Bytecodes::Code Method::orig_bytecode_at(int bci) const { 1520 BreakpointInfo* bp = method_holder()->breakpoints(); 1521 for (; bp != NULL; bp = bp->next()) { 1522 if (bp->match(this, bci)) { 1523 return bp->orig_bytecode(); 1524 } 1525 } 1526 { 1527 ResourceMark rm; 1528 fatal(err_msg("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci)); 1529 } 1530 return Bytecodes::_shouldnotreachhere; 1531} 1532 1533void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) { 1534 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way"); 1535 BreakpointInfo* bp = method_holder()->breakpoints(); 1536 for (; bp != NULL; bp = bp->next()) { 1537 if (bp->match(this, bci)) { 1538 bp->set_orig_bytecode(code); 1539 // and continue, in case there is more than one 1540 } 1541 } 1542} 1543 1544void Method::set_breakpoint(int bci) { 1545 InstanceKlass* ik = method_holder(); 1546 BreakpointInfo *bp = new BreakpointInfo(this, bci); 1547 bp->set_next(ik->breakpoints()); 1548 ik->set_breakpoints(bp); 1549 // do this last: 1550 bp->set(this); 1551} 1552 1553static void clear_matches(Method* m, int bci) { 1554 InstanceKlass* ik = m->method_holder(); 1555 BreakpointInfo* prev_bp = NULL; 1556 BreakpointInfo* next_bp; 1557 for (BreakpointInfo* bp = ik->breakpoints(); bp != NULL; bp = next_bp) { 1558 next_bp = bp->next(); 1559 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint). 1560 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) { 1561 // do this first: 1562 bp->clear(m); 1563 // unhook it 1564 if (prev_bp != NULL) 1565 prev_bp->set_next(next_bp); 1566 else 1567 ik->set_breakpoints(next_bp); 1568 delete bp; 1569 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods 1570 // at same location. So we have multiple matching (method_index and bci) 1571 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one 1572 // breakpoint for clear_breakpoint request and keep all other method versions 1573 // BreakpointInfo for future clear_breakpoint request. 1574 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints) 1575 // which is being called when class is unloaded. We delete all the Breakpoint 1576 // information for all versions of method. We may not correctly restore the original 1577 // bytecode in all method versions, but that is ok. Because the class is being unloaded 1578 // so these methods won't be used anymore. 1579 if (bci >= 0) { 1580 break; 1581 } 1582 } else { 1583 // This one is a keeper. 1584 prev_bp = bp; 1585 } 1586 } 1587} 1588 1589void Method::clear_breakpoint(int bci) { 1590 assert(bci >= 0, ""); 1591 clear_matches(this, bci); 1592} 1593 1594void Method::clear_all_breakpoints() { 1595 clear_matches(this, -1); 1596} 1597 1598 1599int Method::invocation_count() { 1600 MethodCounters *mcs = method_counters(); 1601 if (TieredCompilation) { 1602 MethodData* const mdo = method_data(); 1603 if (((mcs != NULL) ? mcs->invocation_counter()->carry() : false) || 1604 ((mdo != NULL) ? mdo->invocation_counter()->carry() : false)) { 1605 return InvocationCounter::count_limit; 1606 } else { 1607 return ((mcs != NULL) ? mcs->invocation_counter()->count() : 0) + 1608 ((mdo != NULL) ? mdo->invocation_counter()->count() : 0); 1609 } 1610 } else { 1611 return (mcs == NULL) ? 0 : mcs->invocation_counter()->count(); 1612 } 1613} 1614 1615int Method::backedge_count() { 1616 MethodCounters *mcs = method_counters(); 1617 if (TieredCompilation) { 1618 MethodData* const mdo = method_data(); 1619 if (((mcs != NULL) ? mcs->backedge_counter()->carry() : false) || 1620 ((mdo != NULL) ? mdo->backedge_counter()->carry() : false)) { 1621 return InvocationCounter::count_limit; 1622 } else { 1623 return ((mcs != NULL) ? mcs->backedge_counter()->count() : 0) + 1624 ((mdo != NULL) ? mdo->backedge_counter()->count() : 0); 1625 } 1626 } else { 1627 return (mcs == NULL) ? 0 : mcs->backedge_counter()->count(); 1628 } 1629} 1630 1631int Method::highest_comp_level() const { 1632 const MethodData* mdo = method_data(); 1633 if (mdo != NULL) { 1634 return mdo->highest_comp_level(); 1635 } else { 1636 return CompLevel_none; 1637 } 1638} 1639 1640int Method::highest_osr_comp_level() const { 1641 const MethodData* mdo = method_data(); 1642 if (mdo != NULL) { 1643 return mdo->highest_osr_comp_level(); 1644 } else { 1645 return CompLevel_none; 1646 } 1647} 1648 1649void Method::set_highest_comp_level(int level) { 1650 MethodData* mdo = method_data(); 1651 if (mdo != NULL) { 1652 mdo->set_highest_comp_level(level); 1653 } 1654} 1655 1656void Method::set_highest_osr_comp_level(int level) { 1657 MethodData* mdo = method_data(); 1658 if (mdo != NULL) { 1659 mdo->set_highest_osr_comp_level(level); 1660 } 1661} 1662 1663BreakpointInfo::BreakpointInfo(Method* m, int bci) { 1664 _bci = bci; 1665 _name_index = m->name_index(); 1666 _signature_index = m->signature_index(); 1667 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci); 1668 if (_orig_bytecode == Bytecodes::_breakpoint) 1669 _orig_bytecode = m->orig_bytecode_at(_bci); 1670 _next = NULL; 1671} 1672 1673void BreakpointInfo::set(Method* method) { 1674#ifdef ASSERT 1675 { 1676 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci); 1677 if (code == Bytecodes::_breakpoint) 1678 code = method->orig_bytecode_at(_bci); 1679 assert(orig_bytecode() == code, "original bytecode must be the same"); 1680 } 1681#endif 1682 Thread *thread = Thread::current(); 1683 *method->bcp_from(_bci) = Bytecodes::_breakpoint; 1684 method->incr_number_of_breakpoints(thread); 1685 SystemDictionary::notice_modification(); 1686 { 1687 // Deoptimize all dependents on this method 1688 HandleMark hm(thread); 1689 methodHandle mh(thread, method); 1690 Universe::flush_dependents_on_method(mh); 1691 } 1692} 1693 1694void BreakpointInfo::clear(Method* method) { 1695 *method->bcp_from(_bci) = orig_bytecode(); 1696 assert(method->number_of_breakpoints() > 0, "must not go negative"); 1697 method->decr_number_of_breakpoints(Thread::current()); 1698} 1699 1700// jmethodID handling 1701 1702// This is a block allocating object, sort of like JNIHandleBlock, only a 1703// lot simpler. There aren't many of these, they aren't long, they are rarely 1704// deleted and so we can do some suboptimal things. 1705// It's allocated on the CHeap because once we allocate a jmethodID, we can 1706// never get rid of it. 1707// It would be nice to be able to parameterize the number of methods for 1708// the null_class_loader but then we'd have to turn this and ClassLoaderData 1709// into templates. 1710 1711// I feel like this brain dead class should exist somewhere in the STL 1712 1713class JNIMethodBlock : public CHeapObj<mtClass> { 1714 enum { number_of_methods = 8 }; 1715 1716 Method* _methods[number_of_methods]; 1717 int _top; 1718 JNIMethodBlock* _next; 1719 public: 1720 static Method* const _free_method; 1721 1722 JNIMethodBlock() : _next(NULL), _top(0) { 1723 for (int i = 0; i< number_of_methods; i++) _methods[i] = _free_method; 1724 } 1725 1726 Method** add_method(Method* m) { 1727 if (_top < number_of_methods) { 1728 // top points to the next free entry. 1729 int i = _top; 1730 _methods[i] = m; 1731 _top++; 1732 return &_methods[i]; 1733 } else if (_top == number_of_methods) { 1734 // if the next free entry ran off the block see if there's a free entry 1735 for (int i = 0; i< number_of_methods; i++) { 1736 if (_methods[i] == _free_method) { 1737 _methods[i] = m; 1738 return &_methods[i]; 1739 } 1740 } 1741 // Only check each block once for frees. They're very unlikely. 1742 // Increment top past the end of the block. 1743 _top++; 1744 } 1745 // need to allocate a next block. 1746 if (_next == NULL) { 1747 _next = new JNIMethodBlock(); 1748 } 1749 return _next->add_method(m); 1750 } 1751 1752 bool contains(Method** m) { 1753 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) { 1754 for (int i = 0; i< number_of_methods; i++) { 1755 if (&(b->_methods[i]) == m) { 1756 return true; 1757 } 1758 } 1759 } 1760 return false; // not found 1761 } 1762 1763 // Doesn't really destroy it, just marks it as free so it can be reused. 1764 void destroy_method(Method** m) { 1765#ifdef ASSERT 1766 assert(contains(m), "should be a methodID"); 1767#endif // ASSERT 1768 *m = _free_method; 1769 } 1770 1771 // During class unloading the methods are cleared, which is different 1772 // than freed. 1773 void clear_all_methods() { 1774 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) { 1775 for (int i = 0; i< number_of_methods; i++) { 1776 _methods[i] = NULL; 1777 } 1778 } 1779 } 1780#ifndef PRODUCT 1781 int count_methods() { 1782 // count all allocated methods 1783 int count = 0; 1784 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) { 1785 for (int i = 0; i< number_of_methods; i++) { 1786 if (_methods[i] != _free_method) count++; 1787 } 1788 } 1789 return count; 1790 } 1791#endif // PRODUCT 1792}; 1793 1794// Something that can't be mistaken for an address or a markOop 1795Method* const JNIMethodBlock::_free_method = (Method*)55; 1796 1797// Add a method id to the jmethod_ids 1798jmethodID Method::make_jmethod_id(ClassLoaderData* loader_data, Method* m) { 1799 ClassLoaderData* cld = loader_data; 1800 1801 if (!SafepointSynchronize::is_at_safepoint()) { 1802 // Have to add jmethod_ids() to class loader data thread-safely. 1803 // Also have to add the method to the list safely, which the cld lock 1804 // protects as well. 1805 MutexLockerEx ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag); 1806 if (cld->jmethod_ids() == NULL) { 1807 cld->set_jmethod_ids(new JNIMethodBlock()); 1808 } 1809 // jmethodID is a pointer to Method* 1810 return (jmethodID)cld->jmethod_ids()->add_method(m); 1811 } else { 1812 // At safepoint, we are single threaded and can set this. 1813 if (cld->jmethod_ids() == NULL) { 1814 cld->set_jmethod_ids(new JNIMethodBlock()); 1815 } 1816 // jmethodID is a pointer to Method* 1817 return (jmethodID)cld->jmethod_ids()->add_method(m); 1818 } 1819} 1820 1821// Mark a jmethodID as free. This is called when there is a data race in 1822// InstanceKlass while creating the jmethodID cache. 1823void Method::destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID m) { 1824 ClassLoaderData* cld = loader_data; 1825 Method** ptr = (Method**)m; 1826 assert(cld->jmethod_ids() != NULL, "should have method handles"); 1827 cld->jmethod_ids()->destroy_method(ptr); 1828} 1829 1830void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) { 1831 // Can't assert the method_holder is the same because the new method has the 1832 // scratch method holder. 1833 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader() 1834 == new_method->method_holder()->class_loader(), 1835 "changing to a different class loader"); 1836 // Just change the method in place, jmethodID pointer doesn't change. 1837 *((Method**)jmid) = new_method; 1838} 1839 1840bool Method::is_method_id(jmethodID mid) { 1841 Method* m = resolve_jmethod_id(mid); 1842 assert(m != NULL, "should be called with non-null method"); 1843 InstanceKlass* ik = m->method_holder(); 1844 ClassLoaderData* cld = ik->class_loader_data(); 1845 if (cld->jmethod_ids() == NULL) return false; 1846 return (cld->jmethod_ids()->contains((Method**)mid)); 1847} 1848 1849Method* Method::checked_resolve_jmethod_id(jmethodID mid) { 1850 if (mid == NULL) return NULL; 1851 Method* o = resolve_jmethod_id(mid); 1852 if (o == NULL || o == JNIMethodBlock::_free_method || !((Metadata*)o)->is_method()) { 1853 return NULL; 1854 } 1855 return o; 1856}; 1857 1858void Method::set_on_stack(const bool value) { 1859 // Set both the method itself and its constant pool. The constant pool 1860 // on stack means some method referring to it is also on the stack. 1861 _access_flags.set_on_stack(value); 1862 constants()->set_on_stack(value); 1863 if (value) MetadataOnStackMark::record(this); 1864} 1865 1866// Called when the class loader is unloaded to make all methods weak. 1867void Method::clear_jmethod_ids(ClassLoaderData* loader_data) { 1868 loader_data->jmethod_ids()->clear_all_methods(); 1869} 1870 1871 1872// Check that this pointer is valid by checking that the vtbl pointer matches 1873bool Method::is_valid_method() const { 1874 if (this == NULL) { 1875 return false; 1876 } else if (!is_metaspace_object()) { 1877 return false; 1878 } else { 1879 Method m; 1880 // This assumes that the vtbl pointer is the first word of a C++ object. 1881 // This assumption is also in universe.cpp patch_klass_vtble 1882 void* vtbl2 = dereference_vptr((void*)&m); 1883 void* this_vtbl = dereference_vptr((void*)this); 1884 return vtbl2 == this_vtbl; 1885 } 1886} 1887 1888#ifndef PRODUCT 1889void Method::print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) { 1890 out->print_cr("jni_method_id count = %d", loader_data->jmethod_ids()->count_methods()); 1891} 1892#endif // PRODUCT 1893 1894 1895// Printing 1896 1897#ifndef PRODUCT 1898 1899void Method::print_on(outputStream* st) const { 1900 ResourceMark rm; 1901 assert(is_method(), "must be method"); 1902 st->print_cr("%s", internal_name()); 1903 // get the effect of PrintOopAddress, always, for methods: 1904 st->print_cr(" - this oop: "INTPTR_FORMAT, (intptr_t)this); 1905 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr(); 1906 st->print (" - constants: "INTPTR_FORMAT" ", (address)constants()); 1907 constants()->print_value_on(st); st->cr(); 1908 st->print (" - access: 0x%x ", access_flags().as_int()); access_flags().print_on(st); st->cr(); 1909 st->print (" - name: "); name()->print_value_on(st); st->cr(); 1910 st->print (" - signature: "); signature()->print_value_on(st); st->cr(); 1911 st->print_cr(" - max stack: %d", max_stack()); 1912 st->print_cr(" - max locals: %d", max_locals()); 1913 st->print_cr(" - size of params: %d", size_of_parameters()); 1914 st->print_cr(" - method size: %d", method_size()); 1915 if (intrinsic_id() != vmIntrinsics::_none) 1916 st->print_cr(" - intrinsic id: %d %s", intrinsic_id(), vmIntrinsics::name_at(intrinsic_id())); 1917 if (highest_comp_level() != CompLevel_none) 1918 st->print_cr(" - highest level: %d", highest_comp_level()); 1919 st->print_cr(" - vtable index: %d", _vtable_index); 1920 st->print_cr(" - i2i entry: " INTPTR_FORMAT, interpreter_entry()); 1921 st->print( " - adapters: "); 1922 AdapterHandlerEntry* a = ((Method*)this)->adapter(); 1923 if (a == NULL) 1924 st->print_cr(INTPTR_FORMAT, a); 1925 else 1926 a->print_adapter_on(st); 1927 st->print_cr(" - compiled entry " INTPTR_FORMAT, from_compiled_entry()); 1928 st->print_cr(" - code size: %d", code_size()); 1929 if (code_size() != 0) { 1930 st->print_cr(" - code start: " INTPTR_FORMAT, code_base()); 1931 st->print_cr(" - code end (excl): " INTPTR_FORMAT, code_base() + code_size()); 1932 } 1933 if (method_data() != NULL) { 1934 st->print_cr(" - method data: " INTPTR_FORMAT, (address)method_data()); 1935 } 1936 st->print_cr(" - checked ex length: %d", checked_exceptions_length()); 1937 if (checked_exceptions_length() > 0) { 1938 CheckedExceptionElement* table = checked_exceptions_start(); 1939 st->print_cr(" - checked ex start: " INTPTR_FORMAT, table); 1940 if (Verbose) { 1941 for (int i = 0; i < checked_exceptions_length(); i++) { 1942 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index)); 1943 } 1944 } 1945 } 1946 if (has_linenumber_table()) { 1947 u_char* table = compressed_linenumber_table(); 1948 st->print_cr(" - linenumber start: " INTPTR_FORMAT, table); 1949 if (Verbose) { 1950 CompressedLineNumberReadStream stream(table); 1951 while (stream.read_pair()) { 1952 st->print_cr(" - line %d: %d", stream.line(), stream.bci()); 1953 } 1954 } 1955 } 1956 st->print_cr(" - localvar length: %d", localvariable_table_length()); 1957 if (localvariable_table_length() > 0) { 1958 LocalVariableTableElement* table = localvariable_table_start(); 1959 st->print_cr(" - localvar start: " INTPTR_FORMAT, table); 1960 if (Verbose) { 1961 for (int i = 0; i < localvariable_table_length(); i++) { 1962 int bci = table[i].start_bci; 1963 int len = table[i].length; 1964 const char* name = constants()->printable_name_at(table[i].name_cp_index); 1965 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index); 1966 int slot = table[i].slot; 1967 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot); 1968 } 1969 } 1970 } 1971 if (code() != NULL) { 1972 st->print (" - compiled code: "); 1973 code()->print_value_on(st); 1974 } 1975 if (is_native()) { 1976 st->print_cr(" - native function: " INTPTR_FORMAT, native_function()); 1977 st->print_cr(" - signature handler: " INTPTR_FORMAT, signature_handler()); 1978 } 1979} 1980 1981#endif //PRODUCT 1982 1983void Method::print_value_on(outputStream* st) const { 1984 assert(is_method(), "must be method"); 1985 st->print("%s", internal_name()); 1986 print_address_on(st); 1987 st->print(" "); 1988 name()->print_value_on(st); 1989 st->print(" "); 1990 signature()->print_value_on(st); 1991 st->print(" in "); 1992 method_holder()->print_value_on(st); 1993 if (WizardMode) st->print("#%d", _vtable_index); 1994 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals()); 1995 if (WizardMode && code() != NULL) st->print(" ((nmethod*)%p)", code()); 1996} 1997 1998#if INCLUDE_SERVICES 1999// Size Statistics 2000void Method::collect_statistics(KlassSizeStats *sz) const { 2001 int mysize = sz->count(this); 2002 sz->_method_bytes += mysize; 2003 sz->_method_all_bytes += mysize; 2004 sz->_rw_bytes += mysize; 2005 2006 if (constMethod()) { 2007 constMethod()->collect_statistics(sz); 2008 } 2009 if (method_data()) { 2010 method_data()->collect_statistics(sz); 2011 } 2012} 2013#endif // INCLUDE_SERVICES 2014 2015// Verification 2016 2017void Method::verify_on(outputStream* st) { 2018 guarantee(is_method(), "object must be method"); 2019 guarantee(constants()->is_constantPool(), "should be constant pool"); 2020 guarantee(constMethod()->is_constMethod(), "should be ConstMethod*"); 2021 MethodData* md = method_data(); 2022 guarantee(md == NULL || 2023 md->is_methodData(), "should be method data"); 2024} 2025