method.cpp revision 13370:731370f39fcd
1/* 2 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25#include "precompiled.hpp" 26#include "classfile/metadataOnStackMark.hpp" 27#include "classfile/systemDictionary.hpp" 28#include "code/codeCache.hpp" 29#include "code/debugInfoRec.hpp" 30#include "gc/shared/collectedHeap.inline.hpp" 31#include "gc/shared/gcLocker.hpp" 32#include "gc/shared/generation.hpp" 33#include "interpreter/bytecodeStream.hpp" 34#include "interpreter/bytecodeTracer.hpp" 35#include "interpreter/bytecodes.hpp" 36#include "interpreter/interpreter.hpp" 37#include "interpreter/oopMapCache.hpp" 38#include "memory/heapInspection.hpp" 39#include "memory/metadataFactory.hpp" 40#include "memory/metaspaceClosure.hpp" 41#include "memory/metaspaceShared.hpp" 42#include "memory/oopFactory.hpp" 43#include "memory/resourceArea.hpp" 44#include "oops/constMethod.hpp" 45#include "oops/method.hpp" 46#include "oops/methodData.hpp" 47#include "oops/objArrayOop.inline.hpp" 48#include "oops/oop.inline.hpp" 49#include "oops/symbol.hpp" 50#include "prims/jvmtiExport.hpp" 51#include "prims/methodHandles.hpp" 52#include "prims/nativeLookup.hpp" 53#include "runtime/arguments.hpp" 54#include "runtime/compilationPolicy.hpp" 55#include "runtime/frame.inline.hpp" 56#include "runtime/handles.inline.hpp" 57#include "runtime/init.hpp" 58#include "runtime/orderAccess.inline.hpp" 59#include "runtime/relocator.hpp" 60#include "runtime/sharedRuntime.hpp" 61#include "runtime/signature.hpp" 62#include "utilities/align.hpp" 63#include "utilities/quickSort.hpp" 64#include "utilities/vmError.hpp" 65#include "utilities/xmlstream.hpp" 66 67// Implementation of Method 68 69Method* Method::allocate(ClassLoaderData* loader_data, 70 int byte_code_size, 71 AccessFlags access_flags, 72 InlineTableSizes* sizes, 73 ConstMethod::MethodType method_type, 74 TRAPS) { 75 assert(!access_flags.is_native() || byte_code_size == 0, 76 "native methods should not contain byte codes"); 77 ConstMethod* cm = ConstMethod::allocate(loader_data, 78 byte_code_size, 79 sizes, 80 method_type, 81 CHECK_NULL); 82 int size = Method::size(access_flags.is_native()); 83 return new (loader_data, size, MetaspaceObj::MethodType, THREAD) Method(cm, access_flags); 84} 85 86Method::Method(ConstMethod* xconst, AccessFlags access_flags) { 87 NoSafepointVerifier no_safepoint; 88 set_constMethod(xconst); 89 set_access_flags(access_flags); 90 set_intrinsic_id(vmIntrinsics::_none); 91 set_force_inline(false); 92 set_hidden(false); 93 set_dont_inline(false); 94 set_has_injected_profile(false); 95 set_method_data(NULL); 96 clear_method_counters(); 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(false /* don't need a lock */); // 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 clear_method_counters(); 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(const methodHandle& mh, Klass* 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 == 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 assert(k != NULL, "klass not loaded"); 206 if (ex_klass->is_subtype_of(k)) { 207 return handler_bci; 208 } 209 } 210 } 211 } 212 213 return -1; 214} 215 216void Method::mask_for(int bci, InterpreterOopMap* mask) { 217 218 Thread* myThread = Thread::current(); 219 methodHandle h_this(myThread, this); 220#if defined(ASSERT) && !INCLUDE_JVMCI 221 bool has_capability = myThread->is_VM_thread() || 222 myThread->is_ConcurrentGC_thread() || 223 myThread->is_GC_task_thread(); 224 225 if (!has_capability) { 226 if (!VerifyStack && !VerifyLastFrame) { 227 // verify stack calls this outside VM thread 228 warning("oopmap should only be accessed by the " 229 "VM, GC task or CMS threads (or during debugging)"); 230 InterpreterOopMap local_mask; 231 method_holder()->mask_for(h_this, bci, &local_mask); 232 local_mask.print(); 233 } 234 } 235#endif 236 method_holder()->mask_for(h_this, bci, mask); 237 return; 238} 239 240 241int Method::bci_from(address bcp) const { 242 if (is_native() && bcp == 0) { 243 return 0; 244 } 245#ifdef ASSERT 246 { 247 ResourceMark rm; 248 assert(is_native() && bcp == code_base() || contains(bcp) || VMError::is_error_reported(), 249 "bcp doesn't belong to this method: bcp: " INTPTR_FORMAT ", method: %s", 250 p2i(bcp), name_and_sig_as_C_string()); 251 } 252#endif 253 return bcp - code_base(); 254} 255 256 257int Method::validate_bci(int bci) const { 258 return (bci == 0 || bci < code_size()) ? bci : -1; 259} 260 261// Return bci if it appears to be a valid bcp 262// Return -1 otherwise. 263// Used by profiling code, when invalid data is a possibility. 264// The caller is responsible for validating the Method* itself. 265int Method::validate_bci_from_bcp(address bcp) const { 266 // keep bci as -1 if not a valid bci 267 int bci = -1; 268 if (bcp == 0 || bcp == code_base()) { 269 // code_size() may return 0 and we allow 0 here 270 // the method may be native 271 bci = 0; 272 } else if (contains(bcp)) { 273 bci = bcp - code_base(); 274 } 275 // Assert that if we have dodged any asserts, bci is negative. 276 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0"); 277 return bci; 278} 279 280address Method::bcp_from(int bci) const { 281 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()), 282 "illegal bci: %d for %s method", bci, is_native() ? "native" : "non-native"); 283 address bcp = code_base() + bci; 284 assert(is_native() && bcp == code_base() || contains(bcp), "bcp doesn't belong to this method"); 285 return bcp; 286} 287 288address Method::bcp_from(address bcp) const { 289 if (is_native() && bcp == NULL) { 290 return code_base(); 291 } else { 292 return bcp; 293 } 294} 295 296int Method::size(bool is_native) { 297 // If native, then include pointers for native_function and signature_handler 298 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0; 299 int extra_words = align_up(extra_bytes, BytesPerWord) / BytesPerWord; 300 return align_metadata_size(header_size() + extra_words); 301} 302 303 304Symbol* Method::klass_name() const { 305 return method_holder()->name(); 306} 307 308 309void Method::metaspace_pointers_do(MetaspaceClosure* it) { 310 log_trace(cds)("Iter(Method): %p", this); 311 312 it->push(&_constMethod); 313 it->push(&_method_data); 314 it->push(&_method_counters); 315} 316 317// Attempt to return method oop to original state. Clear any pointers 318// (to objects outside the shared spaces). We won't be able to predict 319// where they should point in a new JVM. Further initialize some 320// entries now in order allow them to be write protected later. 321 322void Method::remove_unshareable_info() { 323 unlink_method(); 324} 325 326void Method::set_vtable_index(int index) { 327 if (is_shared() && !MetaspaceShared::remapped_readwrite()) { 328 // At runtime initialize_vtable is rerun as part of link_class_impl() 329 // for a shared class loaded by the non-boot loader to obtain the loader 330 // constraints based on the runtime classloaders' context. 331 return; // don't write into the shared class 332 } else { 333 _vtable_index = index; 334 } 335} 336 337void Method::set_itable_index(int index) { 338 if (is_shared() && !MetaspaceShared::remapped_readwrite()) { 339 // At runtime initialize_itable is rerun as part of link_class_impl() 340 // for a shared class loaded by the non-boot loader to obtain the loader 341 // constraints based on the runtime classloaders' context. The dumptime 342 // itable index should be the same as the runtime index. 343 assert(_vtable_index == itable_index_max - index, 344 "archived itable index is different from runtime index"); 345 return; // don���t write into the shared class 346 } else { 347 _vtable_index = itable_index_max - index; 348 } 349 assert(valid_itable_index(), ""); 350} 351 352 353 354bool Method::was_executed_more_than(int n) { 355 // Invocation counter is reset when the Method* is compiled. 356 // If the method has compiled code we therefore assume it has 357 // be excuted more than n times. 358 if (is_accessor() || is_empty_method() || (code() != NULL)) { 359 // interpreter doesn't bump invocation counter of trivial methods 360 // compiler does not bump invocation counter of compiled methods 361 return true; 362 } 363 else if ((method_counters() != NULL && 364 method_counters()->invocation_counter()->carry()) || 365 (method_data() != NULL && 366 method_data()->invocation_counter()->carry())) { 367 // The carry bit is set when the counter overflows and causes 368 // a compilation to occur. We don't know how many times 369 // the counter has been reset, so we simply assume it has 370 // been executed more than n times. 371 return true; 372 } else { 373 return invocation_count() > n; 374 } 375} 376 377void Method::print_invocation_count() { 378 if (is_static()) tty->print("static "); 379 if (is_final()) tty->print("final "); 380 if (is_synchronized()) tty->print("synchronized "); 381 if (is_native()) tty->print("native "); 382 tty->print("%s::", method_holder()->external_name()); 383 name()->print_symbol_on(tty); 384 signature()->print_symbol_on(tty); 385 386 if (WizardMode) { 387 // dump the size of the byte codes 388 tty->print(" {%d}", code_size()); 389 } 390 tty->cr(); 391 392 tty->print_cr (" interpreter_invocation_count: %8d ", interpreter_invocation_count()); 393 tty->print_cr (" invocation_counter: %8d ", invocation_count()); 394 tty->print_cr (" backedge_counter: %8d ", backedge_count()); 395#ifndef PRODUCT 396 if (CountCompiledCalls) { 397 tty->print_cr (" compiled_invocation_count: %8d ", compiled_invocation_count()); 398 } 399#endif 400} 401 402// Build a MethodData* object to hold information about this method 403// collected in the interpreter. 404void Method::build_interpreter_method_data(const methodHandle& method, TRAPS) { 405 // Do not profile the method if metaspace has hit an OOM previously 406 // allocating profiling data. Callers clear pending exception so don't 407 // add one here. 408 if (ClassLoaderDataGraph::has_metaspace_oom()) { 409 return; 410 } 411 412 // Grab a lock here to prevent multiple 413 // MethodData*s from being created. 414 MutexLocker ml(MethodData_lock, THREAD); 415 if (method->method_data() == NULL) { 416 ClassLoaderData* loader_data = method->method_holder()->class_loader_data(); 417 MethodData* method_data = MethodData::allocate(loader_data, method, THREAD); 418 if (HAS_PENDING_EXCEPTION) { 419 CompileBroker::log_metaspace_failure(); 420 ClassLoaderDataGraph::set_metaspace_oom(true); 421 return; // return the exception (which is cleared) 422 } 423 424 method->set_method_data(method_data); 425 if (PrintMethodData && (Verbose || WizardMode)) { 426 ResourceMark rm(THREAD); 427 tty->print("build_interpreter_method_data for "); 428 method->print_name(tty); 429 tty->cr(); 430 // At the end of the run, the MDO, full of data, will be dumped. 431 } 432 } 433} 434 435MethodCounters* Method::build_method_counters(Method* m, TRAPS) { 436 // Do not profile the method if metaspace has hit an OOM previously 437 if (ClassLoaderDataGraph::has_metaspace_oom()) { 438 return NULL; 439 } 440 441 methodHandle mh(m); 442 MethodCounters* counters = MethodCounters::allocate(mh, THREAD); 443 if (HAS_PENDING_EXCEPTION) { 444 CompileBroker::log_metaspace_failure(); 445 ClassLoaderDataGraph::set_metaspace_oom(true); 446 return NULL; // return the exception (which is cleared) 447 } 448 if (!mh->init_method_counters(counters)) { 449 MetadataFactory::free_metadata(mh->method_holder()->class_loader_data(), counters); 450 } 451 452 if (LogTouchedMethods) { 453 mh->log_touched(CHECK_NULL); 454 } 455 456 return mh->method_counters(); 457} 458 459void Method::cleanup_inline_caches() { 460 // The current system doesn't use inline caches in the interpreter 461 // => nothing to do (keep this method around for future use) 462} 463 464 465int Method::extra_stack_words() { 466 // not an inline function, to avoid a header dependency on Interpreter 467 return extra_stack_entries() * Interpreter::stackElementSize; 468} 469 470 471void Method::compute_size_of_parameters(Thread *thread) { 472 ArgumentSizeComputer asc(signature()); 473 set_size_of_parameters(asc.size() + (is_static() ? 0 : 1)); 474} 475 476BasicType Method::result_type() const { 477 ResultTypeFinder rtf(signature()); 478 return rtf.type(); 479} 480 481 482bool Method::is_empty_method() const { 483 return code_size() == 1 484 && *code_base() == Bytecodes::_return; 485} 486 487 488bool Method::is_vanilla_constructor() const { 489 // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method 490 // which only calls the superclass vanilla constructor and possibly does stores of 491 // zero constants to local fields: 492 // 493 // aload_0 494 // invokespecial 495 // indexbyte1 496 // indexbyte2 497 // 498 // followed by an (optional) sequence of: 499 // 500 // aload_0 501 // aconst_null / iconst_0 / fconst_0 / dconst_0 502 // putfield 503 // indexbyte1 504 // indexbyte2 505 // 506 // followed by: 507 // 508 // return 509 510 assert(name() == vmSymbols::object_initializer_name(), "Should only be called for default constructors"); 511 assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors"); 512 int size = code_size(); 513 // Check if size match 514 if (size == 0 || size % 5 != 0) return false; 515 address cb = code_base(); 516 int last = size - 1; 517 if (cb[0] != Bytecodes::_aload_0 || cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) { 518 // Does not call superclass default constructor 519 return false; 520 } 521 // Check optional sequence 522 for (int i = 4; i < last; i += 5) { 523 if (cb[i] != Bytecodes::_aload_0) return false; 524 if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false; 525 if (cb[i+2] != Bytecodes::_putfield) return false; 526 } 527 return true; 528} 529 530 531bool Method::compute_has_loops_flag() { 532 BytecodeStream bcs(this); 533 Bytecodes::Code bc; 534 535 while ((bc = bcs.next()) >= 0) { 536 switch( bc ) { 537 case Bytecodes::_ifeq: 538 case Bytecodes::_ifnull: 539 case Bytecodes::_iflt: 540 case Bytecodes::_ifle: 541 case Bytecodes::_ifne: 542 case Bytecodes::_ifnonnull: 543 case Bytecodes::_ifgt: 544 case Bytecodes::_ifge: 545 case Bytecodes::_if_icmpeq: 546 case Bytecodes::_if_icmpne: 547 case Bytecodes::_if_icmplt: 548 case Bytecodes::_if_icmpgt: 549 case Bytecodes::_if_icmple: 550 case Bytecodes::_if_icmpge: 551 case Bytecodes::_if_acmpeq: 552 case Bytecodes::_if_acmpne: 553 case Bytecodes::_goto: 554 case Bytecodes::_jsr: 555 if( bcs.dest() < bcs.next_bci() ) _access_flags.set_has_loops(); 556 break; 557 558 case Bytecodes::_goto_w: 559 case Bytecodes::_jsr_w: 560 if( bcs.dest_w() < bcs.next_bci() ) _access_flags.set_has_loops(); 561 break; 562 563 default: 564 break; 565 } 566 } 567 _access_flags.set_loops_flag_init(); 568 return _access_flags.has_loops(); 569} 570 571bool Method::is_final_method(AccessFlags class_access_flags) const { 572 // or "does_not_require_vtable_entry" 573 // default method or overpass can occur, is not final (reuses vtable entry) 574 // private methods in classes get vtable entries for backward class compatibility. 575 if (is_overpass() || is_default_method()) return false; 576 return is_final() || class_access_flags.is_final(); 577} 578 579bool Method::is_final_method() const { 580 return is_final_method(method_holder()->access_flags()); 581} 582 583bool Method::is_default_method() const { 584 if (method_holder() != NULL && 585 method_holder()->is_interface() && 586 !is_abstract() && !is_private()) { 587 return true; 588 } else { 589 return false; 590 } 591} 592 593bool Method::can_be_statically_bound(AccessFlags class_access_flags) const { 594 if (is_final_method(class_access_flags)) return true; 595#ifdef ASSERT 596 ResourceMark rm; 597 bool is_nonv = (vtable_index() == nonvirtual_vtable_index); 598 if (class_access_flags.is_interface()) { 599 assert(is_nonv == is_static() || is_nonv == is_private(), 600 "nonvirtual unexpected for non-static, non-private: %s", 601 name_and_sig_as_C_string()); 602 } 603#endif 604 assert(valid_vtable_index() || valid_itable_index(), "method must be linked before we ask this question"); 605 return vtable_index() == nonvirtual_vtable_index; 606} 607 608bool Method::can_be_statically_bound() const { 609 return can_be_statically_bound(method_holder()->access_flags()); 610} 611 612bool Method::is_accessor() const { 613 return is_getter() || is_setter(); 614} 615 616bool Method::is_getter() const { 617 if (code_size() != 5) return false; 618 if (size_of_parameters() != 1) return false; 619 if (java_code_at(0) != Bytecodes::_aload_0) return false; 620 if (java_code_at(1) != Bytecodes::_getfield) return false; 621 switch (java_code_at(4)) { 622 case Bytecodes::_ireturn: 623 case Bytecodes::_lreturn: 624 case Bytecodes::_freturn: 625 case Bytecodes::_dreturn: 626 case Bytecodes::_areturn: 627 break; 628 default: 629 return false; 630 } 631 return true; 632} 633 634bool Method::is_setter() const { 635 if (code_size() != 6) return false; 636 if (java_code_at(0) != Bytecodes::_aload_0) return false; 637 switch (java_code_at(1)) { 638 case Bytecodes::_iload_1: 639 case Bytecodes::_aload_1: 640 case Bytecodes::_fload_1: 641 if (size_of_parameters() != 2) return false; 642 break; 643 case Bytecodes::_dload_1: 644 case Bytecodes::_lload_1: 645 if (size_of_parameters() != 3) return false; 646 break; 647 default: 648 return false; 649 } 650 if (java_code_at(2) != Bytecodes::_putfield) return false; 651 if (java_code_at(5) != Bytecodes::_return) return false; 652 return true; 653} 654 655bool Method::is_constant_getter() const { 656 int last_index = code_size() - 1; 657 // Check if the first 1-3 bytecodes are a constant push 658 // and the last bytecode is a return. 659 return (2 <= code_size() && code_size() <= 4 && 660 Bytecodes::is_const(java_code_at(0)) && 661 Bytecodes::length_for(java_code_at(0)) == last_index && 662 Bytecodes::is_return(java_code_at(last_index))); 663} 664 665bool Method::is_initializer() const { 666 return is_object_initializer() || is_static_initializer(); 667} 668 669bool Method::has_valid_initializer_flags() const { 670 return (is_static() || 671 method_holder()->major_version() < 51); 672} 673 674bool Method::is_static_initializer() const { 675 // For classfiles version 51 or greater, ensure that the clinit method is 676 // static. Non-static methods with the name "<clinit>" are not static 677 // initializers. (older classfiles exempted for backward compatibility) 678 return name() == vmSymbols::class_initializer_name() && 679 has_valid_initializer_flags(); 680} 681 682bool Method::is_object_initializer() const { 683 return name() == vmSymbols::object_initializer_name(); 684} 685 686objArrayHandle Method::resolved_checked_exceptions_impl(Method* method, TRAPS) { 687 int length = method->checked_exceptions_length(); 688 if (length == 0) { // common case 689 return objArrayHandle(THREAD, Universe::the_empty_class_klass_array()); 690 } else { 691 methodHandle h_this(THREAD, method); 692 objArrayOop m_oop = oopFactory::new_objArray(SystemDictionary::Class_klass(), length, CHECK_(objArrayHandle())); 693 objArrayHandle mirrors (THREAD, m_oop); 694 for (int i = 0; i < length; i++) { 695 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe 696 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle())); 697 assert(k->is_subclass_of(SystemDictionary::Throwable_klass()), "invalid exception class"); 698 mirrors->obj_at_put(i, k->java_mirror()); 699 } 700 return mirrors; 701 } 702}; 703 704 705int Method::line_number_from_bci(int bci) const { 706 if (bci == SynchronizationEntryBCI) bci = 0; 707 assert(bci == 0 || 0 <= bci && bci < code_size(), "illegal bci"); 708 int best_bci = 0; 709 int best_line = -1; 710 711 if (has_linenumber_table()) { 712 // The line numbers are a short array of 2-tuples [start_pc, line_number]. 713 // Not necessarily sorted and not necessarily one-to-one. 714 CompressedLineNumberReadStream stream(compressed_linenumber_table()); 715 while (stream.read_pair()) { 716 if (stream.bci() == bci) { 717 // perfect match 718 return stream.line(); 719 } else { 720 // update best_bci/line 721 if (stream.bci() < bci && stream.bci() >= best_bci) { 722 best_bci = stream.bci(); 723 best_line = stream.line(); 724 } 725 } 726 } 727 } 728 return best_line; 729} 730 731 732bool Method::is_klass_loaded_by_klass_index(int klass_index) const { 733 if( constants()->tag_at(klass_index).is_unresolved_klass() ) { 734 Thread *thread = Thread::current(); 735 Symbol* klass_name = constants()->klass_name_at(klass_index); 736 Handle loader(thread, method_holder()->class_loader()); 737 Handle prot (thread, method_holder()->protection_domain()); 738 return SystemDictionary::find(klass_name, loader, prot, thread) != NULL; 739 } else { 740 return true; 741 } 742} 743 744 745bool Method::is_klass_loaded(int refinfo_index, bool must_be_resolved) const { 746 int klass_index = constants()->klass_ref_index_at(refinfo_index); 747 if (must_be_resolved) { 748 // Make sure klass is resolved in constantpool. 749 if (constants()->tag_at(klass_index).is_unresolved_klass()) return false; 750 } 751 return is_klass_loaded_by_klass_index(klass_index); 752} 753 754 755void Method::set_native_function(address function, bool post_event_flag) { 756 assert(function != NULL, "use clear_native_function to unregister natives"); 757 assert(!is_method_handle_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), ""); 758 address* native_function = native_function_addr(); 759 760 // We can see racers trying to place the same native function into place. Once 761 // is plenty. 762 address current = *native_function; 763 if (current == function) return; 764 if (post_event_flag && JvmtiExport::should_post_native_method_bind() && 765 function != NULL) { 766 // native_method_throw_unsatisfied_link_error_entry() should only 767 // be passed when post_event_flag is false. 768 assert(function != 769 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 770 "post_event_flag mis-match"); 771 772 // post the bind event, and possible change the bind function 773 JvmtiExport::post_native_method_bind(this, &function); 774 } 775 *native_function = function; 776 // This function can be called more than once. We must make sure that we always 777 // use the latest registered method -> check if a stub already has been generated. 778 // If so, we have to make it not_entrant. 779 CompiledMethod* nm = code(); // Put it into local variable to guard against concurrent updates 780 if (nm != NULL) { 781 nm->make_not_entrant(); 782 } 783} 784 785 786bool Method::has_native_function() const { 787 if (is_method_handle_intrinsic()) 788 return false; // special-cased in SharedRuntime::generate_native_wrapper 789 address func = native_function(); 790 return (func != NULL && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry()); 791} 792 793 794void Method::clear_native_function() { 795 // Note: is_method_handle_intrinsic() is allowed here. 796 set_native_function( 797 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 798 !native_bind_event_is_interesting); 799 clear_code(); 800} 801 802address Method::critical_native_function() { 803 methodHandle mh(this); 804 return NativeLookup::lookup_critical_entry(mh); 805} 806 807 808void Method::set_signature_handler(address handler) { 809 address* signature_handler = signature_handler_addr(); 810 *signature_handler = handler; 811} 812 813 814void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) { 815 if (PrintCompilation && report) { 816 ttyLocker ttyl; 817 tty->print("made not %scompilable on ", is_osr ? "OSR " : ""); 818 if (comp_level == CompLevel_all) { 819 tty->print("all levels "); 820 } else { 821 tty->print("levels "); 822 for (int i = (int)CompLevel_none; i <= comp_level; i++) { 823 tty->print("%d ", i); 824 } 825 } 826 this->print_short_name(tty); 827 int size = this->code_size(); 828 if (size > 0) { 829 tty->print(" (%d bytes)", size); 830 } 831 if (reason != NULL) { 832 tty->print(" %s", reason); 833 } 834 tty->cr(); 835 } 836 if ((TraceDeoptimization || LogCompilation) && (xtty != NULL)) { 837 ttyLocker ttyl; 838 xtty->begin_elem("make_not_compilable thread='" UINTX_FORMAT "' osr='%d' level='%d'", 839 os::current_thread_id(), is_osr, comp_level); 840 if (reason != NULL) { 841 xtty->print(" reason=\'%s\'", reason); 842 } 843 xtty->method(this); 844 xtty->stamp(); 845 xtty->end_elem(); 846 } 847} 848 849bool Method::is_always_compilable() const { 850 // Generated adapters must be compiled 851 if (is_method_handle_intrinsic() && is_synthetic()) { 852 assert(!is_not_c1_compilable(), "sanity check"); 853 assert(!is_not_c2_compilable(), "sanity check"); 854 return true; 855 } 856 857 return false; 858} 859 860bool Method::is_not_compilable(int comp_level) const { 861 if (number_of_breakpoints() > 0) 862 return true; 863 if (is_always_compilable()) 864 return false; 865 if (comp_level == CompLevel_any) 866 return is_not_c1_compilable() || is_not_c2_compilable(); 867 if (is_c1_compile(comp_level)) 868 return is_not_c1_compilable(); 869 if (is_c2_compile(comp_level)) 870 return is_not_c2_compilable(); 871 return false; 872} 873 874// call this when compiler finds that this method is not compilable 875void Method::set_not_compilable(int comp_level, bool report, const char* reason) { 876 if (is_always_compilable()) { 877 // Don't mark a method which should be always compilable 878 return; 879 } 880 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason); 881 if (comp_level == CompLevel_all) { 882 set_not_c1_compilable(); 883 set_not_c2_compilable(); 884 } else { 885 if (is_c1_compile(comp_level)) 886 set_not_c1_compilable(); 887 if (is_c2_compile(comp_level)) 888 set_not_c2_compilable(); 889 } 890 CompilationPolicy::policy()->disable_compilation(this); 891 assert(!CompilationPolicy::can_be_compiled(this, comp_level), "sanity check"); 892} 893 894bool Method::is_not_osr_compilable(int comp_level) const { 895 if (is_not_compilable(comp_level)) 896 return true; 897 if (comp_level == CompLevel_any) 898 return is_not_c1_osr_compilable() || is_not_c2_osr_compilable(); 899 if (is_c1_compile(comp_level)) 900 return is_not_c1_osr_compilable(); 901 if (is_c2_compile(comp_level)) 902 return is_not_c2_osr_compilable(); 903 return false; 904} 905 906void Method::set_not_osr_compilable(int comp_level, bool report, const char* reason) { 907 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason); 908 if (comp_level == CompLevel_all) { 909 set_not_c1_osr_compilable(); 910 set_not_c2_osr_compilable(); 911 } else { 912 if (is_c1_compile(comp_level)) 913 set_not_c1_osr_compilable(); 914 if (is_c2_compile(comp_level)) 915 set_not_c2_osr_compilable(); 916 } 917 CompilationPolicy::policy()->disable_compilation(this); 918 assert(!CompilationPolicy::can_be_osr_compiled(this, comp_level), "sanity check"); 919} 920 921// Revert to using the interpreter and clear out the nmethod 922void Method::clear_code(bool acquire_lock /* = true */) { 923 MutexLockerEx pl(acquire_lock ? Patching_lock : NULL, Mutex::_no_safepoint_check_flag); 924 // this may be NULL if c2i adapters have not been made yet 925 // Only should happen at allocate time. 926 if (adapter() == NULL) { 927 _from_compiled_entry = NULL; 928 } else { 929 _from_compiled_entry = adapter()->get_c2i_entry(); 930 } 931 OrderAccess::storestore(); 932 _from_interpreted_entry = _i2i_entry; 933 OrderAccess::storestore(); 934 _code = NULL; 935} 936 937#if INCLUDE_CDS 938// Called by class data sharing to remove any entry points (which are not shared) 939void Method::unlink_method() { 940 _code = NULL; 941 942 assert(DumpSharedSpaces, "dump time only"); 943 // Set the values to what they should be at run time. Note that 944 // this Method can no longer be executed during dump time. 945 _i2i_entry = Interpreter::entry_for_cds_method(this); 946 _from_interpreted_entry = _i2i_entry; 947 948 if (is_native()) { 949 *native_function_addr() = NULL; 950 set_signature_handler(NULL); 951 } 952 NOT_PRODUCT(set_compiled_invocation_count(0);) 953 954 CDSAdapterHandlerEntry* cds_adapter = (CDSAdapterHandlerEntry*)adapter(); 955 constMethod()->set_adapter_trampoline(cds_adapter->get_adapter_trampoline()); 956 _from_compiled_entry = cds_adapter->get_c2i_entry_trampoline(); 957 assert(*((int*)_from_compiled_entry) == 0, "must be NULL during dump time, to be initialized at run time"); 958 959 960 // In case of DumpSharedSpaces, _method_data should always be NULL. 961 assert(_method_data == NULL, "unexpected method data?"); 962 963 set_method_data(NULL); 964 clear_method_counters(); 965} 966#endif 967 968/**************************************************************************** 969// The following illustrates how the entries work for CDS shared Methods: 970// 971// Our goal is to delay writing into a shared Method until it's compiled. 972// Hence, we want to determine the initial values for _i2i_entry, 973// _from_interpreted_entry and _from_compiled_entry during CDS dump time. 974// 975// In this example, both Methods A and B have the _i2i_entry of "zero_locals". 976// They also have similar signatures so that they will share the same 977// AdapterHandlerEntry. 978// 979// _adapter_trampoline points to a fixed location in the RW section of 980// the CDS archive. This location initially contains a NULL pointer. When the 981// first of method A or B is linked, an AdapterHandlerEntry is allocated 982// dynamically, and its c2i/i2c entries are generated. 983// 984// _i2i_entry and _from_interpreted_entry initially points to the same 985// (fixed) location in the CODE section of the CDS archive. This contains 986// an unconditional branch to the actual entry for "zero_locals", which is 987// generated at run time and may be on an arbitrary address. Thus, the 988// unconditional branch is also generated at run time to jump to the correct 989// address. 990// 991// Similarly, _from_compiled_entry points to a fixed address in the CODE 992// section. This address has enough space for an unconditional branch 993// instruction, and is initially zero-filled. After the AdapterHandlerEntry is 994// initialized, and the address for the actual c2i_entry is known, we emit a 995// branch instruction here to branch to the actual c2i_entry. 996// 997// The effect of the extra branch on the i2i and c2i entries is negligible. 998// 999// The reason for putting _adapter_trampoline in RO is many shared Methods 1000// share the same AdapterHandlerEntry, so we can save space in the RW section 1001// by having the extra indirection. 1002 1003 1004[Method A: RW] 1005 _constMethod ----> [ConstMethod: RO] 1006 _adapter_trampoline -----------+ 1007 | 1008 _i2i_entry (same value as method B) | 1009 _from_interpreted_entry (same value as method B) | 1010 _from_compiled_entry (same value as method B) | 1011 | 1012 | 1013[Method B: RW] +--------+ 1014 _constMethod ----> [ConstMethod: RO] | 1015 _adapter_trampoline --+--->(AdapterHandlerEntry* ptr: RW)-+ 1016 | 1017 +-------------------------------+ 1018 | 1019 +----> [AdapterHandlerEntry] (allocated at run time) 1020 _fingerprint 1021 _c2i_entry ---------------------------------+->[c2i entry..] 1022 _i2i_entry -------------+ _i2c_entry ---------------+-> [i2c entry..] | 1023 _from_interpreted_entry | _c2i_unverified_entry | | 1024 | | | | 1025 | | (_cds_entry_table: CODE) | | 1026 | +->[0]: jmp _entry_table[0] --> (i2i_entry_for "zero_locals") | | 1027 | | (allocated at run time) | | 1028 | | ... [asm code ...] | | 1029 +-[not compiled]-+ [n]: jmp _entry_table[n] | | 1030 | | | 1031 | | | 1032 +-[compiled]-------------------------------------------------------------------+ | 1033 | 1034 _from_compiled_entry------------> (_c2i_entry_trampoline: CODE) | 1035 [jmp c2i_entry] ------------------------------------------------------+ 1036 1037***/ 1038 1039// Called when the method_holder is getting linked. Setup entrypoints so the method 1040// is ready to be called from interpreter, compiler, and vtables. 1041void Method::link_method(const methodHandle& h_method, TRAPS) { 1042 // If the code cache is full, we may reenter this function for the 1043 // leftover methods that weren't linked. 1044 if (is_shared()) { 1045 address entry = Interpreter::entry_for_cds_method(h_method); 1046 assert(entry != NULL && entry == _i2i_entry, 1047 "should be correctly set during dump time"); 1048 if (adapter() != NULL) { 1049 return; 1050 } 1051 assert(entry == _from_interpreted_entry, 1052 "should be correctly set during dump time"); 1053 } else if (_i2i_entry != NULL) { 1054 return; 1055 } 1056 assert( _code == NULL, "nothing compiled yet" ); 1057 1058 // Setup interpreter entrypoint 1059 assert(this == h_method(), "wrong h_method()" ); 1060 1061 if (!is_shared()) { 1062 assert(adapter() == NULL, "init'd to NULL"); 1063 address entry = Interpreter::entry_for_method(h_method); 1064 assert(entry != NULL, "interpreter entry must be non-null"); 1065 // Sets both _i2i_entry and _from_interpreted_entry 1066 set_interpreter_entry(entry); 1067 } 1068 1069 // Don't overwrite already registered native entries. 1070 if (is_native() && !has_native_function()) { 1071 set_native_function( 1072 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 1073 !native_bind_event_is_interesting); 1074 } 1075 1076 // Setup compiler entrypoint. This is made eagerly, so we do not need 1077 // special handling of vtables. An alternative is to make adapters more 1078 // lazily by calling make_adapter() from from_compiled_entry() for the 1079 // normal calls. For vtable calls life gets more complicated. When a 1080 // call-site goes mega-morphic we need adapters in all methods which can be 1081 // called from the vtable. We need adapters on such methods that get loaded 1082 // later. Ditto for mega-morphic itable calls. If this proves to be a 1083 // problem we'll make these lazily later. 1084 (void) make_adapters(h_method, CHECK); 1085 1086 // ONLY USE the h_method now as make_adapter may have blocked 1087 1088} 1089 1090address Method::make_adapters(const methodHandle& mh, TRAPS) { 1091 // Adapters for compiled code are made eagerly here. They are fairly 1092 // small (generally < 100 bytes) and quick to make (and cached and shared) 1093 // so making them eagerly shouldn't be too expensive. 1094 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh); 1095 if (adapter == NULL ) { 1096 if (!is_init_completed()) { 1097 // Don't throw exceptions during VM initialization because java.lang.* classes 1098 // might not have been initialized, causing problems when constructing the 1099 // Java exception object. 1100 vm_exit_during_initialization("Out of space in CodeCache for adapters"); 1101 } else { 1102 THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "Out of space in CodeCache for adapters"); 1103 } 1104 } 1105 1106 if (mh->is_shared()) { 1107 assert(mh->adapter() == adapter, "must be"); 1108 assert(mh->_from_compiled_entry != NULL, "must be"); 1109 } else { 1110 mh->set_adapter_entry(adapter); 1111 mh->_from_compiled_entry = adapter->get_c2i_entry(); 1112 } 1113 return adapter->get_c2i_entry(); 1114} 1115 1116void Method::restore_unshareable_info(TRAPS) { 1117 assert(is_method() && is_valid_method(), "ensure C++ vtable is restored"); 1118 1119 // Since restore_unshareable_info can be called more than once for a method, don't 1120 // redo any work. 1121 if (adapter() == NULL) { 1122 methodHandle mh(THREAD, this); 1123 link_method(mh, CHECK); 1124 } 1125} 1126 1127volatile address Method::from_compiled_entry_no_trampoline() const { 1128 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code); 1129 if (code) { 1130 return code->verified_entry_point(); 1131 } else { 1132 return adapter()->get_c2i_entry(); 1133 } 1134} 1135 1136// The verified_code_entry() must be called when a invoke is resolved 1137// on this method. 1138 1139// It returns the compiled code entry point, after asserting not null. 1140// This function is called after potential safepoints so that nmethod 1141// or adapter that it points to is still live and valid. 1142// This function must not hit a safepoint! 1143address Method::verified_code_entry() { 1144 debug_only(NoSafepointVerifier nsv;) 1145 assert(_from_compiled_entry != NULL, "must be set"); 1146 return _from_compiled_entry; 1147} 1148 1149// Check that if an nmethod ref exists, it has a backlink to this or no backlink at all 1150// (could be racing a deopt). 1151// Not inline to avoid circular ref. 1152bool Method::check_code() const { 1153 // cached in a register or local. There's a race on the value of the field. 1154 CompiledMethod *code = (CompiledMethod *)OrderAccess::load_ptr_acquire(&_code); 1155 return code == NULL || (code->method() == NULL) || (code->method() == (Method*)this && !code->is_osr_method()); 1156} 1157 1158// Install compiled code. Instantly it can execute. 1159void Method::set_code(const methodHandle& mh, CompiledMethod *code) { 1160 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 1161 assert( code, "use clear_code to remove code" ); 1162 assert( mh->check_code(), "" ); 1163 1164 guarantee(mh->adapter() != NULL, "Adapter blob must already exist!"); 1165 1166 // These writes must happen in this order, because the interpreter will 1167 // directly jump to from_interpreted_entry which jumps to an i2c adapter 1168 // which jumps to _from_compiled_entry. 1169 mh->_code = code; // Assign before allowing compiled code to exec 1170 1171 int comp_level = code->comp_level(); 1172 // In theory there could be a race here. In practice it is unlikely 1173 // and not worth worrying about. 1174 if (comp_level > mh->highest_comp_level()) { 1175 mh->set_highest_comp_level(comp_level); 1176 } 1177 1178 OrderAccess::storestore(); 1179#ifdef SHARK 1180 mh->_from_interpreted_entry = code->insts_begin(); 1181#else //!SHARK 1182 mh->_from_compiled_entry = code->verified_entry_point(); 1183 OrderAccess::storestore(); 1184 // Instantly compiled code can execute. 1185 if (!mh->is_method_handle_intrinsic()) 1186 mh->_from_interpreted_entry = mh->get_i2c_entry(); 1187#endif //!SHARK 1188} 1189 1190 1191bool Method::is_overridden_in(Klass* k) const { 1192 InstanceKlass* ik = InstanceKlass::cast(k); 1193 1194 if (ik->is_interface()) return false; 1195 1196 // If method is an interface, we skip it - except if it 1197 // is a miranda method 1198 if (method_holder()->is_interface()) { 1199 // Check that method is not a miranda method 1200 if (ik->lookup_method(name(), signature()) == NULL) { 1201 // No implementation exist - so miranda method 1202 return false; 1203 } 1204 return true; 1205 } 1206 1207 assert(ik->is_subclass_of(method_holder()), "should be subklass"); 1208 if (!has_vtable_index()) { 1209 return false; 1210 } else { 1211 Method* vt_m = ik->method_at_vtable(vtable_index()); 1212 return vt_m != this; 1213 } 1214} 1215 1216 1217// give advice about whether this Method* should be cached or not 1218bool Method::should_not_be_cached() const { 1219 if (is_old()) { 1220 // This method has been redefined. It is either EMCP or obsolete 1221 // and we don't want to cache it because that would pin the method 1222 // down and prevent it from being collectible if and when it 1223 // finishes executing. 1224 return true; 1225 } 1226 1227 // caching this method should be just fine 1228 return false; 1229} 1230 1231 1232/** 1233 * Returns true if this is one of the specially treated methods for 1234 * security related stack walks (like Reflection.getCallerClass). 1235 */ 1236bool Method::is_ignored_by_security_stack_walk() const { 1237 if (intrinsic_id() == vmIntrinsics::_invoke) { 1238 // This is Method.invoke() -- ignore it 1239 return true; 1240 } 1241 if (method_holder()->is_subclass_of(SystemDictionary::reflect_MethodAccessorImpl_klass())) { 1242 // This is an auxilary frame -- ignore it 1243 return true; 1244 } 1245 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) { 1246 // This is an internal adapter frame for method handles -- ignore it 1247 return true; 1248 } 1249 return false; 1250} 1251 1252 1253// Constant pool structure for invoke methods: 1254enum { 1255 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc. 1256 _imcp_invoke_signature, // utf8: (variable Symbol*) 1257 _imcp_limit 1258}; 1259 1260// Test if this method is an MH adapter frame generated by Java code. 1261// Cf. java/lang/invoke/InvokerBytecodeGenerator 1262bool Method::is_compiled_lambda_form() const { 1263 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm; 1264} 1265 1266// Test if this method is an internal MH primitive method. 1267bool Method::is_method_handle_intrinsic() const { 1268 vmIntrinsics::ID iid = intrinsic_id(); 1269 return (MethodHandles::is_signature_polymorphic(iid) && 1270 MethodHandles::is_signature_polymorphic_intrinsic(iid)); 1271} 1272 1273bool Method::has_member_arg() const { 1274 vmIntrinsics::ID iid = intrinsic_id(); 1275 return (MethodHandles::is_signature_polymorphic(iid) && 1276 MethodHandles::has_member_arg(iid)); 1277} 1278 1279// Make an instance of a signature-polymorphic internal MH primitive. 1280methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid, 1281 Symbol* signature, 1282 TRAPS) { 1283 ResourceMark rm; 1284 methodHandle empty; 1285 1286 InstanceKlass* holder = SystemDictionary::MethodHandle_klass(); 1287 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid); 1288 assert(iid == MethodHandles::signature_polymorphic_name_id(name), ""); 1289 if (TraceMethodHandles) { 1290 tty->print_cr("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string()); 1291 } 1292 1293 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup) 1294 name->increment_refcount(); 1295 signature->increment_refcount(); 1296 1297 int cp_length = _imcp_limit; 1298 ClassLoaderData* loader_data = holder->class_loader_data(); 1299 constantPoolHandle cp; 1300 { 1301 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty)); 1302 cp = constantPoolHandle(THREAD, cp_oop); 1303 } 1304 cp->set_pool_holder(holder); 1305 cp->symbol_at_put(_imcp_invoke_name, name); 1306 cp->symbol_at_put(_imcp_invoke_signature, signature); 1307 cp->set_has_preresolution(); 1308 1309 // decide on access bits: public or not? 1310 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL); 1311 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid); 1312 if (must_be_static) flags_bits |= JVM_ACC_STATIC; 1313 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods"); 1314 1315 methodHandle m; 1316 { 1317 InlineTableSizes sizes; 1318 Method* m_oop = Method::allocate(loader_data, 0, 1319 accessFlags_from(flags_bits), &sizes, 1320 ConstMethod::NORMAL, CHECK_(empty)); 1321 m = methodHandle(THREAD, m_oop); 1322 } 1323 m->set_constants(cp()); 1324 m->set_name_index(_imcp_invoke_name); 1325 m->set_signature_index(_imcp_invoke_signature); 1326 assert(MethodHandles::is_signature_polymorphic_name(m->name()), ""); 1327 assert(m->signature() == signature, ""); 1328 ResultTypeFinder rtf(signature); 1329 m->constMethod()->set_result_type(rtf.type()); 1330 m->compute_size_of_parameters(THREAD); 1331 m->init_intrinsic_id(); 1332 assert(m->is_method_handle_intrinsic(), ""); 1333#ifdef ASSERT 1334 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print(); 1335 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker"); 1336 assert(m->intrinsic_id() == iid, "correctly predicted iid"); 1337#endif //ASSERT 1338 1339 // Finally, set up its entry points. 1340 assert(m->can_be_statically_bound(), ""); 1341 m->set_vtable_index(Method::nonvirtual_vtable_index); 1342 m->link_method(m, CHECK_(empty)); 1343 1344 if (TraceMethodHandles && (Verbose || WizardMode)) { 1345 ttyLocker ttyl; 1346 m->print_on(tty); 1347 } 1348 1349 return m; 1350} 1351 1352Klass* Method::check_non_bcp_klass(Klass* klass) { 1353 if (klass != NULL && klass->class_loader() != NULL) { 1354 if (klass->is_objArray_klass()) 1355 klass = ObjArrayKlass::cast(klass)->bottom_klass(); 1356 return klass; 1357 } 1358 return NULL; 1359} 1360 1361 1362methodHandle Method::clone_with_new_data(const methodHandle& m, u_char* new_code, int new_code_length, 1363 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) { 1364 // Code below does not work for native methods - they should never get rewritten anyway 1365 assert(!m->is_native(), "cannot rewrite native methods"); 1366 // Allocate new Method* 1367 AccessFlags flags = m->access_flags(); 1368 1369 ConstMethod* cm = m->constMethod(); 1370 int checked_exceptions_len = cm->checked_exceptions_length(); 1371 int localvariable_len = cm->localvariable_table_length(); 1372 int exception_table_len = cm->exception_table_length(); 1373 int method_parameters_len = cm->method_parameters_length(); 1374 int method_annotations_len = cm->method_annotations_length(); 1375 int parameter_annotations_len = cm->parameter_annotations_length(); 1376 int type_annotations_len = cm->type_annotations_length(); 1377 int default_annotations_len = cm->default_annotations_length(); 1378 1379 InlineTableSizes sizes( 1380 localvariable_len, 1381 new_compressed_linenumber_size, 1382 exception_table_len, 1383 checked_exceptions_len, 1384 method_parameters_len, 1385 cm->generic_signature_index(), 1386 method_annotations_len, 1387 parameter_annotations_len, 1388 type_annotations_len, 1389 default_annotations_len, 1390 0); 1391 1392 ClassLoaderData* loader_data = m->method_holder()->class_loader_data(); 1393 Method* newm_oop = Method::allocate(loader_data, 1394 new_code_length, 1395 flags, 1396 &sizes, 1397 m->method_type(), 1398 CHECK_(methodHandle())); 1399 methodHandle newm (THREAD, newm_oop); 1400 1401 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod* 1402 ConstMethod* newcm = newm->constMethod(); 1403 int new_const_method_size = newm->constMethod()->size(); 1404 1405 // This works because the source and target are both Methods. Some compilers 1406 // (e.g., clang) complain that the target vtable pointer will be stomped, 1407 // so cast away newm()'s and m()'s Methodness. 1408 memcpy((void*)newm(), (void*)m(), sizeof(Method)); 1409 1410 // Create shallow copy of ConstMethod. 1411 memcpy(newcm, m->constMethod(), sizeof(ConstMethod)); 1412 1413 // Reset correct method/const method, method size, and parameter info 1414 newm->set_constMethod(newcm); 1415 newm->constMethod()->set_code_size(new_code_length); 1416 newm->constMethod()->set_constMethod_size(new_const_method_size); 1417 assert(newm->code_size() == new_code_length, "check"); 1418 assert(newm->method_parameters_length() == method_parameters_len, "check"); 1419 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check"); 1420 assert(newm->exception_table_length() == exception_table_len, "check"); 1421 assert(newm->localvariable_table_length() == localvariable_len, "check"); 1422 // Copy new byte codes 1423 memcpy(newm->code_base(), new_code, new_code_length); 1424 // Copy line number table 1425 if (new_compressed_linenumber_size > 0) { 1426 memcpy(newm->compressed_linenumber_table(), 1427 new_compressed_linenumber_table, 1428 new_compressed_linenumber_size); 1429 } 1430 // Copy method_parameters 1431 if (method_parameters_len > 0) { 1432 memcpy(newm->method_parameters_start(), 1433 m->method_parameters_start(), 1434 method_parameters_len * sizeof(MethodParametersElement)); 1435 } 1436 // Copy checked_exceptions 1437 if (checked_exceptions_len > 0) { 1438 memcpy(newm->checked_exceptions_start(), 1439 m->checked_exceptions_start(), 1440 checked_exceptions_len * sizeof(CheckedExceptionElement)); 1441 } 1442 // Copy exception table 1443 if (exception_table_len > 0) { 1444 memcpy(newm->exception_table_start(), 1445 m->exception_table_start(), 1446 exception_table_len * sizeof(ExceptionTableElement)); 1447 } 1448 // Copy local variable number table 1449 if (localvariable_len > 0) { 1450 memcpy(newm->localvariable_table_start(), 1451 m->localvariable_table_start(), 1452 localvariable_len * sizeof(LocalVariableTableElement)); 1453 } 1454 // Copy stackmap table 1455 if (m->has_stackmap_table()) { 1456 int code_attribute_length = m->stackmap_data()->length(); 1457 Array<u1>* stackmap_data = 1458 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_NULL); 1459 memcpy((void*)stackmap_data->adr_at(0), 1460 (void*)m->stackmap_data()->adr_at(0), code_attribute_length); 1461 newm->set_stackmap_data(stackmap_data); 1462 } 1463 1464 // copy annotations over to new method 1465 newcm->copy_annotations_from(loader_data, cm, CHECK_NULL); 1466 return newm; 1467} 1468 1469vmSymbols::SID Method::klass_id_for_intrinsics(const Klass* holder) { 1470 // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics 1471 // because we are not loading from core libraries 1472 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar 1473 // which does not use the class default class loader so we check for its loader here 1474 const InstanceKlass* ik = InstanceKlass::cast(holder); 1475 if ((ik->class_loader() != NULL) && !SystemDictionary::is_platform_class_loader(ik->class_loader())) { 1476 return vmSymbols::NO_SID; // regardless of name, no intrinsics here 1477 } 1478 1479 // see if the klass name is well-known: 1480 Symbol* klass_name = ik->name(); 1481 return vmSymbols::find_sid(klass_name); 1482} 1483 1484void Method::init_intrinsic_id() { 1485 assert(_intrinsic_id == vmIntrinsics::_none, "do this just once"); 1486 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte)); 1487 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size"); 1488 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), ""); 1489 1490 // the klass name is well-known: 1491 vmSymbols::SID klass_id = klass_id_for_intrinsics(method_holder()); 1492 assert(klass_id != vmSymbols::NO_SID, "caller responsibility"); 1493 1494 // ditto for method and signature: 1495 vmSymbols::SID name_id = vmSymbols::find_sid(name()); 1496 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) 1497 && klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle) 1498 && name_id == vmSymbols::NO_SID) { 1499 return; 1500 } 1501 vmSymbols::SID sig_id = vmSymbols::find_sid(signature()); 1502 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) 1503 && klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle) 1504 && sig_id == vmSymbols::NO_SID) { 1505 return; 1506 } 1507 jshort flags = access_flags().as_short(); 1508 1509 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); 1510 if (id != vmIntrinsics::_none) { 1511 set_intrinsic_id(id); 1512 if (id == vmIntrinsics::_Class_cast) { 1513 // Even if the intrinsic is rejected, we want to inline this simple method. 1514 set_force_inline(true); 1515 } 1516 return; 1517 } 1518 1519 // A few slightly irregular cases: 1520 switch (klass_id) { 1521 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_StrictMath): 1522 // Second chance: check in regular Math. 1523 switch (name_id) { 1524 case vmSymbols::VM_SYMBOL_ENUM_NAME(min_name): 1525 case vmSymbols::VM_SYMBOL_ENUM_NAME(max_name): 1526 case vmSymbols::VM_SYMBOL_ENUM_NAME(sqrt_name): 1527 // pretend it is the corresponding method in the non-strict class: 1528 klass_id = vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_Math); 1529 id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); 1530 break; 1531 default: 1532 break; 1533 } 1534 break; 1535 1536 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*., VarHandle 1537 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle): 1538 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle): 1539 if (!is_native()) break; 1540 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name()); 1541 if (is_static() != MethodHandles::is_signature_polymorphic_static(id)) 1542 id = vmIntrinsics::_none; 1543 break; 1544 1545 default: 1546 break; 1547 } 1548 1549 if (id != vmIntrinsics::_none) { 1550 // Set up its iid. It is an alias method. 1551 set_intrinsic_id(id); 1552 return; 1553 } 1554} 1555 1556// These two methods are static since a GC may move the Method 1557bool Method::load_signature_classes(const methodHandle& m, TRAPS) { 1558 if (!THREAD->can_call_java()) { 1559 // There is nothing useful this routine can do from within the Compile thread. 1560 // Hopefully, the signature contains only well-known classes. 1561 // We could scan for this and return true/false, but the caller won't care. 1562 return false; 1563 } 1564 bool sig_is_loaded = true; 1565 Handle class_loader(THREAD, m->method_holder()->class_loader()); 1566 Handle protection_domain(THREAD, m->method_holder()->protection_domain()); 1567 ResourceMark rm(THREAD); 1568 Symbol* signature = m->signature(); 1569 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) { 1570 if (ss.is_object()) { 1571 Symbol* sym = ss.as_symbol(CHECK_(false)); 1572 Symbol* name = sym; 1573 Klass* klass = SystemDictionary::resolve_or_null(name, class_loader, 1574 protection_domain, THREAD); 1575 // We are loading classes eagerly. If a ClassNotFoundException or 1576 // a LinkageError was generated, be sure to ignore it. 1577 if (HAS_PENDING_EXCEPTION) { 1578 if (PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass()) || 1579 PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) { 1580 CLEAR_PENDING_EXCEPTION; 1581 } else { 1582 return false; 1583 } 1584 } 1585 if( klass == NULL) { sig_is_loaded = false; } 1586 } 1587 } 1588 return sig_is_loaded; 1589} 1590 1591bool Method::has_unloaded_classes_in_signature(const methodHandle& m, TRAPS) { 1592 Handle class_loader(THREAD, m->method_holder()->class_loader()); 1593 Handle protection_domain(THREAD, m->method_holder()->protection_domain()); 1594 ResourceMark rm(THREAD); 1595 Symbol* signature = m->signature(); 1596 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) { 1597 if (ss.type() == T_OBJECT) { 1598 Symbol* name = ss.as_symbol_or_null(); 1599 if (name == NULL) return true; 1600 Klass* klass = SystemDictionary::find(name, class_loader, protection_domain, THREAD); 1601 if (klass == NULL) return true; 1602 } 1603 } 1604 return false; 1605} 1606 1607// Exposed so field engineers can debug VM 1608void Method::print_short_name(outputStream* st) { 1609 ResourceMark rm; 1610#ifdef PRODUCT 1611 st->print(" %s::", method_holder()->external_name()); 1612#else 1613 st->print(" %s::", method_holder()->internal_name()); 1614#endif 1615 name()->print_symbol_on(st); 1616 if (WizardMode) signature()->print_symbol_on(st); 1617 else if (MethodHandles::is_signature_polymorphic(intrinsic_id())) 1618 MethodHandles::print_as_basic_type_signature_on(st, signature(), true); 1619} 1620 1621// Comparer for sorting an object array containing 1622// Method*s. 1623static int method_comparator(Method* a, Method* b) { 1624 return a->name()->fast_compare(b->name()); 1625} 1626 1627// This is only done during class loading, so it is OK to assume method_idnum matches the methods() array 1628// default_methods also uses this without the ordering for fast find_method 1629void Method::sort_methods(Array<Method*>* methods, bool idempotent, bool set_idnums) { 1630 int length = methods->length(); 1631 if (length > 1) { 1632 { 1633 NoSafepointVerifier nsv; 1634 QuickSort::sort<Method*>(methods->data(), length, method_comparator, idempotent); 1635 } 1636 // Reset method ordering 1637 if (set_idnums) { 1638 for (int i = 0; i < length; i++) { 1639 Method* m = methods->at(i); 1640 m->set_method_idnum(i); 1641 m->set_orig_method_idnum(i); 1642 } 1643 } 1644 } 1645} 1646 1647//----------------------------------------------------------------------------------- 1648// Non-product code unless JVM/TI needs it 1649 1650#if !defined(PRODUCT) || INCLUDE_JVMTI 1651class SignatureTypePrinter : public SignatureTypeNames { 1652 private: 1653 outputStream* _st; 1654 bool _use_separator; 1655 1656 void type_name(const char* name) { 1657 if (_use_separator) _st->print(", "); 1658 _st->print("%s", name); 1659 _use_separator = true; 1660 } 1661 1662 public: 1663 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) { 1664 _st = st; 1665 _use_separator = false; 1666 } 1667 1668 void print_parameters() { _use_separator = false; iterate_parameters(); } 1669 void print_returntype() { _use_separator = false; iterate_returntype(); } 1670}; 1671 1672 1673void Method::print_name(outputStream* st) { 1674 Thread *thread = Thread::current(); 1675 ResourceMark rm(thread); 1676 st->print("%s ", is_static() ? "static" : "virtual"); 1677 if (WizardMode) { 1678 st->print("%s.", method_holder()->internal_name()); 1679 name()->print_symbol_on(st); 1680 signature()->print_symbol_on(st); 1681 } else { 1682 SignatureTypePrinter sig(signature(), st); 1683 sig.print_returntype(); 1684 st->print(" %s.", method_holder()->internal_name()); 1685 name()->print_symbol_on(st); 1686 st->print("("); 1687 sig.print_parameters(); 1688 st->print(")"); 1689 } 1690} 1691#endif // !PRODUCT || INCLUDE_JVMTI 1692 1693 1694void Method::print_codes_on(outputStream* st) const { 1695 print_codes_on(0, code_size(), st); 1696} 1697 1698void Method::print_codes_on(int from, int to, outputStream* st) const { 1699 Thread *thread = Thread::current(); 1700 ResourceMark rm(thread); 1701 methodHandle mh (thread, (Method*)this); 1702 BytecodeStream s(mh); 1703 s.set_interval(from, to); 1704 BytecodeTracer::set_closure(BytecodeTracer::std_closure()); 1705 while (s.next() >= 0) BytecodeTracer::trace(mh, s.bcp(), st); 1706} 1707 1708 1709// Simple compression of line number tables. We use a regular compressed stream, except that we compress deltas 1710// between (bci,line) pairs since they are smaller. If (bci delta, line delta) fits in (5-bit unsigned, 3-bit unsigned) 1711// we save it as one byte, otherwise we write a 0xFF escape character and use regular compression. 0x0 is used 1712// as end-of-stream terminator. 1713 1714void CompressedLineNumberWriteStream::write_pair_regular(int bci_delta, int line_delta) { 1715 // bci and line number does not compress into single byte. 1716 // Write out escape character and use regular compression for bci and line number. 1717 write_byte((jubyte)0xFF); 1718 write_signed_int(bci_delta); 1719 write_signed_int(line_delta); 1720} 1721 1722// See comment in method.hpp which explains why this exists. 1723#if defined(_M_AMD64) && _MSC_VER >= 1400 1724#pragma optimize("", off) 1725void CompressedLineNumberWriteStream::write_pair(int bci, int line) { 1726 write_pair_inline(bci, line); 1727} 1728#pragma optimize("", on) 1729#endif 1730 1731CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) { 1732 _bci = 0; 1733 _line = 0; 1734}; 1735 1736 1737bool CompressedLineNumberReadStream::read_pair() { 1738 jubyte next = read_byte(); 1739 // Check for terminator 1740 if (next == 0) return false; 1741 if (next == 0xFF) { 1742 // Escape character, regular compression used 1743 _bci += read_signed_int(); 1744 _line += read_signed_int(); 1745 } else { 1746 // Single byte compression used 1747 _bci += next >> 3; 1748 _line += next & 0x7; 1749 } 1750 return true; 1751} 1752 1753#if INCLUDE_JVMTI 1754 1755Bytecodes::Code Method::orig_bytecode_at(int bci) const { 1756 BreakpointInfo* bp = method_holder()->breakpoints(); 1757 for (; bp != NULL; bp = bp->next()) { 1758 if (bp->match(this, bci)) { 1759 return bp->orig_bytecode(); 1760 } 1761 } 1762 { 1763 ResourceMark rm; 1764 fatal("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci); 1765 } 1766 return Bytecodes::_shouldnotreachhere; 1767} 1768 1769void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) { 1770 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way"); 1771 BreakpointInfo* bp = method_holder()->breakpoints(); 1772 for (; bp != NULL; bp = bp->next()) { 1773 if (bp->match(this, bci)) { 1774 bp->set_orig_bytecode(code); 1775 // and continue, in case there is more than one 1776 } 1777 } 1778} 1779 1780void Method::set_breakpoint(int bci) { 1781 InstanceKlass* ik = method_holder(); 1782 BreakpointInfo *bp = new BreakpointInfo(this, bci); 1783 bp->set_next(ik->breakpoints()); 1784 ik->set_breakpoints(bp); 1785 // do this last: 1786 bp->set(this); 1787} 1788 1789static void clear_matches(Method* m, int bci) { 1790 InstanceKlass* ik = m->method_holder(); 1791 BreakpointInfo* prev_bp = NULL; 1792 BreakpointInfo* next_bp; 1793 for (BreakpointInfo* bp = ik->breakpoints(); bp != NULL; bp = next_bp) { 1794 next_bp = bp->next(); 1795 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint). 1796 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) { 1797 // do this first: 1798 bp->clear(m); 1799 // unhook it 1800 if (prev_bp != NULL) 1801 prev_bp->set_next(next_bp); 1802 else 1803 ik->set_breakpoints(next_bp); 1804 delete bp; 1805 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods 1806 // at same location. So we have multiple matching (method_index and bci) 1807 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one 1808 // breakpoint for clear_breakpoint request and keep all other method versions 1809 // BreakpointInfo for future clear_breakpoint request. 1810 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints) 1811 // which is being called when class is unloaded. We delete all the Breakpoint 1812 // information for all versions of method. We may not correctly restore the original 1813 // bytecode in all method versions, but that is ok. Because the class is being unloaded 1814 // so these methods won't be used anymore. 1815 if (bci >= 0) { 1816 break; 1817 } 1818 } else { 1819 // This one is a keeper. 1820 prev_bp = bp; 1821 } 1822 } 1823} 1824 1825void Method::clear_breakpoint(int bci) { 1826 assert(bci >= 0, ""); 1827 clear_matches(this, bci); 1828} 1829 1830void Method::clear_all_breakpoints() { 1831 clear_matches(this, -1); 1832} 1833 1834#endif // INCLUDE_JVMTI 1835 1836int Method::invocation_count() { 1837 MethodCounters *mcs = method_counters(); 1838 if (TieredCompilation) { 1839 MethodData* const mdo = method_data(); 1840 if (((mcs != NULL) ? mcs->invocation_counter()->carry() : false) || 1841 ((mdo != NULL) ? mdo->invocation_counter()->carry() : false)) { 1842 return InvocationCounter::count_limit; 1843 } else { 1844 return ((mcs != NULL) ? mcs->invocation_counter()->count() : 0) + 1845 ((mdo != NULL) ? mdo->invocation_counter()->count() : 0); 1846 } 1847 } else { 1848 return (mcs == NULL) ? 0 : mcs->invocation_counter()->count(); 1849 } 1850} 1851 1852int Method::backedge_count() { 1853 MethodCounters *mcs = method_counters(); 1854 if (TieredCompilation) { 1855 MethodData* const mdo = method_data(); 1856 if (((mcs != NULL) ? mcs->backedge_counter()->carry() : false) || 1857 ((mdo != NULL) ? mdo->backedge_counter()->carry() : false)) { 1858 return InvocationCounter::count_limit; 1859 } else { 1860 return ((mcs != NULL) ? mcs->backedge_counter()->count() : 0) + 1861 ((mdo != NULL) ? mdo->backedge_counter()->count() : 0); 1862 } 1863 } else { 1864 return (mcs == NULL) ? 0 : mcs->backedge_counter()->count(); 1865 } 1866} 1867 1868int Method::highest_comp_level() const { 1869 const MethodCounters* mcs = method_counters(); 1870 if (mcs != NULL) { 1871 return mcs->highest_comp_level(); 1872 } else { 1873 return CompLevel_none; 1874 } 1875} 1876 1877int Method::highest_osr_comp_level() const { 1878 const MethodCounters* mcs = method_counters(); 1879 if (mcs != NULL) { 1880 return mcs->highest_osr_comp_level(); 1881 } else { 1882 return CompLevel_none; 1883 } 1884} 1885 1886void Method::set_highest_comp_level(int level) { 1887 MethodCounters* mcs = method_counters(); 1888 if (mcs != NULL) { 1889 mcs->set_highest_comp_level(level); 1890 } 1891} 1892 1893void Method::set_highest_osr_comp_level(int level) { 1894 MethodCounters* mcs = method_counters(); 1895 if (mcs != NULL) { 1896 mcs->set_highest_osr_comp_level(level); 1897 } 1898} 1899 1900#if INCLUDE_JVMTI 1901 1902BreakpointInfo::BreakpointInfo(Method* m, int bci) { 1903 _bci = bci; 1904 _name_index = m->name_index(); 1905 _signature_index = m->signature_index(); 1906 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci); 1907 if (_orig_bytecode == Bytecodes::_breakpoint) 1908 _orig_bytecode = m->orig_bytecode_at(_bci); 1909 _next = NULL; 1910} 1911 1912void BreakpointInfo::set(Method* method) { 1913#ifdef ASSERT 1914 { 1915 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci); 1916 if (code == Bytecodes::_breakpoint) 1917 code = method->orig_bytecode_at(_bci); 1918 assert(orig_bytecode() == code, "original bytecode must be the same"); 1919 } 1920#endif 1921 Thread *thread = Thread::current(); 1922 *method->bcp_from(_bci) = Bytecodes::_breakpoint; 1923 method->incr_number_of_breakpoints(thread); 1924 SystemDictionary::notice_modification(); 1925 { 1926 // Deoptimize all dependents on this method 1927 HandleMark hm(thread); 1928 methodHandle mh(thread, method); 1929 CodeCache::flush_dependents_on_method(mh); 1930 } 1931} 1932 1933void BreakpointInfo::clear(Method* method) { 1934 *method->bcp_from(_bci) = orig_bytecode(); 1935 assert(method->number_of_breakpoints() > 0, "must not go negative"); 1936 method->decr_number_of_breakpoints(Thread::current()); 1937} 1938 1939#endif // INCLUDE_JVMTI 1940 1941// jmethodID handling 1942 1943// This is a block allocating object, sort of like JNIHandleBlock, only a 1944// lot simpler. 1945// It's allocated on the CHeap because once we allocate a jmethodID, we can 1946// never get rid of it. 1947 1948static const int min_block_size = 8; 1949 1950class JNIMethodBlockNode : public CHeapObj<mtClass> { 1951 friend class JNIMethodBlock; 1952 Method** _methods; 1953 int _number_of_methods; 1954 int _top; 1955 JNIMethodBlockNode* _next; 1956 1957 public: 1958 1959 JNIMethodBlockNode(int num_methods = min_block_size); 1960 1961 ~JNIMethodBlockNode() { FREE_C_HEAP_ARRAY(Method*, _methods); } 1962 1963 void ensure_methods(int num_addl_methods) { 1964 if (_top < _number_of_methods) { 1965 num_addl_methods -= _number_of_methods - _top; 1966 if (num_addl_methods <= 0) { 1967 return; 1968 } 1969 } 1970 if (_next == NULL) { 1971 _next = new JNIMethodBlockNode(MAX2(num_addl_methods, min_block_size)); 1972 } else { 1973 _next->ensure_methods(num_addl_methods); 1974 } 1975 } 1976}; 1977 1978class JNIMethodBlock : public CHeapObj<mtClass> { 1979 JNIMethodBlockNode _head; 1980 JNIMethodBlockNode *_last_free; 1981 public: 1982 static Method* const _free_method; 1983 1984 JNIMethodBlock(int initial_capacity = min_block_size) 1985 : _head(initial_capacity), _last_free(&_head) {} 1986 1987 void ensure_methods(int num_addl_methods) { 1988 _last_free->ensure_methods(num_addl_methods); 1989 } 1990 1991 Method** add_method(Method* m) { 1992 for (JNIMethodBlockNode* b = _last_free; b != NULL; b = b->_next) { 1993 if (b->_top < b->_number_of_methods) { 1994 // top points to the next free entry. 1995 int i = b->_top; 1996 b->_methods[i] = m; 1997 b->_top++; 1998 _last_free = b; 1999 return &(b->_methods[i]); 2000 } else if (b->_top == b->_number_of_methods) { 2001 // if the next free entry ran off the block see if there's a free entry 2002 for (int i = 0; i < b->_number_of_methods; i++) { 2003 if (b->_methods[i] == _free_method) { 2004 b->_methods[i] = m; 2005 _last_free = b; 2006 return &(b->_methods[i]); 2007 } 2008 } 2009 // Only check each block once for frees. They're very unlikely. 2010 // Increment top past the end of the block. 2011 b->_top++; 2012 } 2013 // need to allocate a next block. 2014 if (b->_next == NULL) { 2015 b->_next = _last_free = new JNIMethodBlockNode(); 2016 } 2017 } 2018 guarantee(false, "Should always allocate a free block"); 2019 return NULL; 2020 } 2021 2022 bool contains(Method** m) { 2023 if (m == NULL) return false; 2024 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) { 2025 if (b->_methods <= m && m < b->_methods + b->_number_of_methods) { 2026 // This is a bit of extra checking, for two reasons. One is 2027 // that contains() deals with pointers that are passed in by 2028 // JNI code, so making sure that the pointer is aligned 2029 // correctly is valuable. The other is that <= and > are 2030 // technically not defined on pointers, so the if guard can 2031 // pass spuriously; no modern compiler is likely to make that 2032 // a problem, though (and if one did, the guard could also 2033 // fail spuriously, which would be bad). 2034 ptrdiff_t idx = m - b->_methods; 2035 if (b->_methods + idx == m) { 2036 return true; 2037 } 2038 } 2039 } 2040 return false; // not found 2041 } 2042 2043 // Doesn't really destroy it, just marks it as free so it can be reused. 2044 void destroy_method(Method** m) { 2045#ifdef ASSERT 2046 assert(contains(m), "should be a methodID"); 2047#endif // ASSERT 2048 *m = _free_method; 2049 } 2050 2051 // During class unloading the methods are cleared, which is different 2052 // than freed. 2053 void clear_all_methods() { 2054 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) { 2055 for (int i = 0; i< b->_number_of_methods; i++) { 2056 b->_methods[i] = NULL; 2057 } 2058 } 2059 } 2060#ifndef PRODUCT 2061 int count_methods() { 2062 // count all allocated methods 2063 int count = 0; 2064 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) { 2065 for (int i = 0; i< b->_number_of_methods; i++) { 2066 if (b->_methods[i] != _free_method) count++; 2067 } 2068 } 2069 return count; 2070 } 2071#endif // PRODUCT 2072}; 2073 2074// Something that can't be mistaken for an address or a markOop 2075Method* const JNIMethodBlock::_free_method = (Method*)55; 2076 2077JNIMethodBlockNode::JNIMethodBlockNode(int num_methods) : _next(NULL), _top(0) { 2078 _number_of_methods = MAX2(num_methods, min_block_size); 2079 _methods = NEW_C_HEAP_ARRAY(Method*, _number_of_methods, mtInternal); 2080 for (int i = 0; i < _number_of_methods; i++) { 2081 _methods[i] = JNIMethodBlock::_free_method; 2082 } 2083} 2084 2085void Method::ensure_jmethod_ids(ClassLoaderData* loader_data, int capacity) { 2086 ClassLoaderData* cld = loader_data; 2087 if (!SafepointSynchronize::is_at_safepoint()) { 2088 // Have to add jmethod_ids() to class loader data thread-safely. 2089 // Also have to add the method to the list safely, which the cld lock 2090 // protects as well. 2091 MutexLockerEx ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag); 2092 if (cld->jmethod_ids() == NULL) { 2093 cld->set_jmethod_ids(new JNIMethodBlock(capacity)); 2094 } else { 2095 cld->jmethod_ids()->ensure_methods(capacity); 2096 } 2097 } else { 2098 // At safepoint, we are single threaded and can set this. 2099 if (cld->jmethod_ids() == NULL) { 2100 cld->set_jmethod_ids(new JNIMethodBlock(capacity)); 2101 } else { 2102 cld->jmethod_ids()->ensure_methods(capacity); 2103 } 2104 } 2105} 2106 2107// Add a method id to the jmethod_ids 2108jmethodID Method::make_jmethod_id(ClassLoaderData* loader_data, Method* m) { 2109 ClassLoaderData* cld = loader_data; 2110 2111 if (!SafepointSynchronize::is_at_safepoint()) { 2112 // Have to add jmethod_ids() to class loader data thread-safely. 2113 // Also have to add the method to the list safely, which the cld lock 2114 // protects as well. 2115 MutexLockerEx ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag); 2116 if (cld->jmethod_ids() == NULL) { 2117 cld->set_jmethod_ids(new JNIMethodBlock()); 2118 } 2119 // jmethodID is a pointer to Method* 2120 return (jmethodID)cld->jmethod_ids()->add_method(m); 2121 } else { 2122 // At safepoint, we are single threaded and can set this. 2123 if (cld->jmethod_ids() == NULL) { 2124 cld->set_jmethod_ids(new JNIMethodBlock()); 2125 } 2126 // jmethodID is a pointer to Method* 2127 return (jmethodID)cld->jmethod_ids()->add_method(m); 2128 } 2129} 2130 2131// Mark a jmethodID as free. This is called when there is a data race in 2132// InstanceKlass while creating the jmethodID cache. 2133void Method::destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID m) { 2134 ClassLoaderData* cld = loader_data; 2135 Method** ptr = (Method**)m; 2136 assert(cld->jmethod_ids() != NULL, "should have method handles"); 2137 cld->jmethod_ids()->destroy_method(ptr); 2138} 2139 2140void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) { 2141 // Can't assert the method_holder is the same because the new method has the 2142 // scratch method holder. 2143 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader() 2144 == new_method->method_holder()->class_loader(), 2145 "changing to a different class loader"); 2146 // Just change the method in place, jmethodID pointer doesn't change. 2147 *((Method**)jmid) = new_method; 2148} 2149 2150bool Method::is_method_id(jmethodID mid) { 2151 Method* m = resolve_jmethod_id(mid); 2152 assert(m != NULL, "should be called with non-null method"); 2153 InstanceKlass* ik = m->method_holder(); 2154 ClassLoaderData* cld = ik->class_loader_data(); 2155 if (cld->jmethod_ids() == NULL) return false; 2156 return (cld->jmethod_ids()->contains((Method**)mid)); 2157} 2158 2159Method* Method::checked_resolve_jmethod_id(jmethodID mid) { 2160 if (mid == NULL) return NULL; 2161 Method* o = resolve_jmethod_id(mid); 2162 if (o == NULL || o == JNIMethodBlock::_free_method || !((Metadata*)o)->is_method()) { 2163 return NULL; 2164 } 2165 return o; 2166}; 2167 2168void Method::set_on_stack(const bool value) { 2169 // Set both the method itself and its constant pool. The constant pool 2170 // on stack means some method referring to it is also on the stack. 2171 constants()->set_on_stack(value); 2172 2173 bool already_set = on_stack(); 2174 _access_flags.set_on_stack(value); 2175 if (value && !already_set) { 2176 MetadataOnStackMark::record(this); 2177 } 2178} 2179 2180// Called when the class loader is unloaded to make all methods weak. 2181void Method::clear_jmethod_ids(ClassLoaderData* loader_data) { 2182 loader_data->jmethod_ids()->clear_all_methods(); 2183} 2184 2185bool Method::has_method_vptr(const void* ptr) { 2186 Method m; 2187 // This assumes that the vtbl pointer is the first word of a C++ object. 2188 return dereference_vptr(&m) == dereference_vptr(ptr); 2189} 2190 2191// Check that this pointer is valid by checking that the vtbl pointer matches 2192bool Method::is_valid_method() const { 2193 if (this == NULL) { 2194 return false; 2195 } else if ((intptr_t(this) & (wordSize-1)) != 0) { 2196 // Quick sanity check on pointer. 2197 return false; 2198 } else if (MetaspaceShared::is_in_shared_space(this)) { 2199 return MetaspaceShared::is_valid_shared_method(this); 2200 } else if (Metaspace::contains_non_shared(this)) { 2201 return has_method_vptr((const void*)this); 2202 } else { 2203 return false; 2204 } 2205} 2206 2207#ifndef PRODUCT 2208void Method::print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) { 2209 out->print_cr("jni_method_id count = %d", loader_data->jmethod_ids()->count_methods()); 2210} 2211#endif // PRODUCT 2212 2213 2214// Printing 2215 2216#ifndef PRODUCT 2217 2218void Method::print_on(outputStream* st) const { 2219 ResourceMark rm; 2220 assert(is_method(), "must be method"); 2221 st->print_cr("%s", internal_name()); 2222 st->print_cr(" - this oop: " INTPTR_FORMAT, p2i(this)); 2223 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr(); 2224 st->print (" - constants: " INTPTR_FORMAT " ", p2i(constants())); 2225 constants()->print_value_on(st); st->cr(); 2226 st->print (" - access: 0x%x ", access_flags().as_int()); access_flags().print_on(st); st->cr(); 2227 st->print (" - name: "); name()->print_value_on(st); st->cr(); 2228 st->print (" - signature: "); signature()->print_value_on(st); st->cr(); 2229 st->print_cr(" - max stack: %d", max_stack()); 2230 st->print_cr(" - max locals: %d", max_locals()); 2231 st->print_cr(" - size of params: %d", size_of_parameters()); 2232 st->print_cr(" - method size: %d", method_size()); 2233 if (intrinsic_id() != vmIntrinsics::_none) 2234 st->print_cr(" - intrinsic id: %d %s", intrinsic_id(), vmIntrinsics::name_at(intrinsic_id())); 2235 if (highest_comp_level() != CompLevel_none) 2236 st->print_cr(" - highest level: %d", highest_comp_level()); 2237 st->print_cr(" - vtable index: %d", _vtable_index); 2238 st->print_cr(" - i2i entry: " INTPTR_FORMAT, p2i(interpreter_entry())); 2239 st->print( " - adapters: "); 2240 AdapterHandlerEntry* a = ((Method*)this)->adapter(); 2241 if (a == NULL) 2242 st->print_cr(INTPTR_FORMAT, p2i(a)); 2243 else 2244 a->print_adapter_on(st); 2245 st->print_cr(" - compiled entry " INTPTR_FORMAT, p2i(from_compiled_entry())); 2246 st->print_cr(" - code size: %d", code_size()); 2247 if (code_size() != 0) { 2248 st->print_cr(" - code start: " INTPTR_FORMAT, p2i(code_base())); 2249 st->print_cr(" - code end (excl): " INTPTR_FORMAT, p2i(code_base() + code_size())); 2250 } 2251 if (method_data() != NULL) { 2252 st->print_cr(" - method data: " INTPTR_FORMAT, p2i(method_data())); 2253 } 2254 st->print_cr(" - checked ex length: %d", checked_exceptions_length()); 2255 if (checked_exceptions_length() > 0) { 2256 CheckedExceptionElement* table = checked_exceptions_start(); 2257 st->print_cr(" - checked ex start: " INTPTR_FORMAT, p2i(table)); 2258 if (Verbose) { 2259 for (int i = 0; i < checked_exceptions_length(); i++) { 2260 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index)); 2261 } 2262 } 2263 } 2264 if (has_linenumber_table()) { 2265 u_char* table = compressed_linenumber_table(); 2266 st->print_cr(" - linenumber start: " INTPTR_FORMAT, p2i(table)); 2267 if (Verbose) { 2268 CompressedLineNumberReadStream stream(table); 2269 while (stream.read_pair()) { 2270 st->print_cr(" - line %d: %d", stream.line(), stream.bci()); 2271 } 2272 } 2273 } 2274 st->print_cr(" - localvar length: %d", localvariable_table_length()); 2275 if (localvariable_table_length() > 0) { 2276 LocalVariableTableElement* table = localvariable_table_start(); 2277 st->print_cr(" - localvar start: " INTPTR_FORMAT, p2i(table)); 2278 if (Verbose) { 2279 for (int i = 0; i < localvariable_table_length(); i++) { 2280 int bci = table[i].start_bci; 2281 int len = table[i].length; 2282 const char* name = constants()->printable_name_at(table[i].name_cp_index); 2283 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index); 2284 int slot = table[i].slot; 2285 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot); 2286 } 2287 } 2288 } 2289 if (code() != NULL) { 2290 st->print (" - compiled code: "); 2291 code()->print_value_on(st); 2292 } 2293 if (is_native()) { 2294 st->print_cr(" - native function: " INTPTR_FORMAT, p2i(native_function())); 2295 st->print_cr(" - signature handler: " INTPTR_FORMAT, p2i(signature_handler())); 2296 } 2297} 2298 2299void Method::print_linkage_flags(outputStream* st) { 2300 access_flags().print_on(st); 2301 if (is_default_method()) { 2302 st->print("default "); 2303 } 2304 if (is_overpass()) { 2305 st->print("overpass "); 2306 } 2307} 2308#endif //PRODUCT 2309 2310void Method::print_value_on(outputStream* st) const { 2311 assert(is_method(), "must be method"); 2312 st->print("%s", internal_name()); 2313 print_address_on(st); 2314 st->print(" "); 2315 name()->print_value_on(st); 2316 st->print(" "); 2317 signature()->print_value_on(st); 2318 st->print(" in "); 2319 method_holder()->print_value_on(st); 2320 if (WizardMode) st->print("#%d", _vtable_index); 2321 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals()); 2322 if (WizardMode && code() != NULL) st->print(" ((nmethod*)%p)", code()); 2323} 2324 2325#if INCLUDE_SERVICES 2326// Size Statistics 2327void Method::collect_statistics(KlassSizeStats *sz) const { 2328 int mysize = sz->count(this); 2329 sz->_method_bytes += mysize; 2330 sz->_method_all_bytes += mysize; 2331 sz->_rw_bytes += mysize; 2332 2333 if (constMethod()) { 2334 constMethod()->collect_statistics(sz); 2335 } 2336 if (method_data()) { 2337 method_data()->collect_statistics(sz); 2338 } 2339} 2340#endif // INCLUDE_SERVICES 2341 2342// LogTouchedMethods and PrintTouchedMethods 2343 2344// TouchedMethodRecord -- we can't use a HashtableEntry<Method*> because 2345// the Method may be garbage collected. Let's roll our own hash table. 2346class TouchedMethodRecord : CHeapObj<mtTracing> { 2347public: 2348 // It's OK to store Symbols here because they will NOT be GC'ed if 2349 // LogTouchedMethods is enabled. 2350 TouchedMethodRecord* _next; 2351 Symbol* _class_name; 2352 Symbol* _method_name; 2353 Symbol* _method_signature; 2354}; 2355 2356static const int TOUCHED_METHOD_TABLE_SIZE = 20011; 2357static TouchedMethodRecord** _touched_method_table = NULL; 2358 2359void Method::log_touched(TRAPS) { 2360 2361 const int table_size = TOUCHED_METHOD_TABLE_SIZE; 2362 Symbol* my_class = klass_name(); 2363 Symbol* my_name = name(); 2364 Symbol* my_sig = signature(); 2365 2366 unsigned int hash = my_class->identity_hash() + 2367 my_name->identity_hash() + 2368 my_sig->identity_hash(); 2369 juint index = juint(hash) % table_size; 2370 2371 MutexLocker ml(TouchedMethodLog_lock, THREAD); 2372 if (_touched_method_table == NULL) { 2373 _touched_method_table = NEW_C_HEAP_ARRAY2(TouchedMethodRecord*, table_size, 2374 mtTracing, CURRENT_PC); 2375 memset(_touched_method_table, 0, sizeof(TouchedMethodRecord*)*table_size); 2376 } 2377 2378 TouchedMethodRecord* ptr = _touched_method_table[index]; 2379 while (ptr) { 2380 if (ptr->_class_name == my_class && 2381 ptr->_method_name == my_name && 2382 ptr->_method_signature == my_sig) { 2383 return; 2384 } 2385 if (ptr->_next == NULL) break; 2386 ptr = ptr->_next; 2387 } 2388 TouchedMethodRecord* nptr = NEW_C_HEAP_OBJ(TouchedMethodRecord, mtTracing); 2389 my_class->set_permanent(); // prevent reclaimed by GC 2390 my_name->set_permanent(); 2391 my_sig->set_permanent(); 2392 nptr->_class_name = my_class; 2393 nptr->_method_name = my_name; 2394 nptr->_method_signature = my_sig; 2395 nptr->_next = NULL; 2396 2397 if (ptr == NULL) { 2398 // first 2399 _touched_method_table[index] = nptr; 2400 } else { 2401 ptr->_next = nptr; 2402 } 2403} 2404 2405void Method::print_touched_methods(outputStream* out) { 2406 MutexLockerEx ml(Thread::current()->is_VM_thread() ? NULL : TouchedMethodLog_lock); 2407 out->print_cr("# Method::print_touched_methods version 1"); 2408 if (_touched_method_table) { 2409 for (int i = 0; i < TOUCHED_METHOD_TABLE_SIZE; i++) { 2410 TouchedMethodRecord* ptr = _touched_method_table[i]; 2411 while(ptr) { 2412 ptr->_class_name->print_symbol_on(out); out->print("."); 2413 ptr->_method_name->print_symbol_on(out); out->print(":"); 2414 ptr->_method_signature->print_symbol_on(out); out->cr(); 2415 ptr = ptr->_next; 2416 } 2417 } 2418 } 2419} 2420 2421// Verification 2422 2423void Method::verify_on(outputStream* st) { 2424 guarantee(is_method(), "object must be method"); 2425 guarantee(constants()->is_constantPool(), "should be constant pool"); 2426 guarantee(constMethod()->is_constMethod(), "should be ConstMethod*"); 2427 MethodData* md = method_data(); 2428 guarantee(md == NULL || 2429 md->is_methodData(), "should be method data"); 2430} 2431