1 /* 2 * Copyright (c) 1997, 2019, 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 "jvm.h" 27 #include "code/codeCache.hpp" 28 #include "code/compiledIC.hpp" 29 #include "code/compiledMethod.inline.hpp" 30 #include "code/dependencies.hpp" 31 #include "code/nativeInst.hpp" 32 #include "code/nmethod.hpp" 33 #include "code/scopeDesc.hpp" 34 #include "compiler/abstractCompiler.hpp" 35 #include "compiler/compileBroker.hpp" 36 #include "compiler/compileLog.hpp" 37 #include "compiler/compilerDirectives.hpp" 38 #include "compiler/directivesParser.hpp" 39 #include "compiler/disassembler.hpp" 40 #include "interpreter/bytecode.hpp" 41 #include "logging/log.hpp" 42 #include "logging/logStream.hpp" 43 #include "memory/allocation.inline.hpp" 44 #include "memory/resourceArea.hpp" 45 #include "oops/access.inline.hpp" 46 #include "oops/method.inline.hpp" 47 #include "oops/methodData.hpp" 48 #include "oops/oop.inline.hpp" 49 #include "prims/jvmtiImpl.hpp" 50 #include "runtime/atomic.hpp" 51 #include "runtime/flags/flagSetting.hpp" 52 #include "runtime/frame.inline.hpp" 53 #include "runtime/handles.inline.hpp" 54 #include "runtime/jniHandles.inline.hpp" 55 #include "runtime/orderAccess.hpp" 56 #include "runtime/os.hpp" 57 #include "runtime/safepointVerifiers.hpp" 58 #include "runtime/sharedRuntime.hpp" 59 #include "runtime/sweeper.hpp" 60 #include "runtime/vmThread.hpp" 61 #include "utilities/align.hpp" 62 #include "utilities/dtrace.hpp" 63 #include "utilities/events.hpp" 64 #include "utilities/resourceHash.hpp" 65 #include "utilities/xmlstream.hpp" 66 #if INCLUDE_JVMCI 67 #include "jvmci/jvmciJavaClasses.hpp" 68 #endif 69 70 #ifdef DTRACE_ENABLED 71 72 // Only bother with this argument setup if dtrace is available 73 74 #define DTRACE_METHOD_UNLOAD_PROBE(method) \ 75 { \ 76 Method* m = (method); \ 77 if (m != NULL) { \ 78 Symbol* klass_name = m->klass_name(); \ 79 Symbol* name = m->name(); \ 80 Symbol* signature = m->signature(); \ 81 HOTSPOT_COMPILED_METHOD_UNLOAD( \ 82 (char *) klass_name->bytes(), klass_name->utf8_length(), \ 83 (char *) name->bytes(), name->utf8_length(), \ 84 (char *) signature->bytes(), signature->utf8_length()); \ 85 } \ 86 } 87 88 #else // ndef DTRACE_ENABLED 89 90 #define DTRACE_METHOD_UNLOAD_PROBE(method) 91 92 #endif 93 94 //--------------------------------------------------------------------------------- 95 // NMethod statistics 96 // They are printed under various flags, including: 97 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation. 98 // (In the latter two cases, they like other stats are printed to the log only.) 99 100 #ifndef PRODUCT 101 // These variables are put into one block to reduce relocations 102 // and make it simpler to print from the debugger. 103 struct java_nmethod_stats_struct { 104 int nmethod_count; 105 int total_size; 106 int relocation_size; 107 int consts_size; 108 int insts_size; 109 int stub_size; 110 int scopes_data_size; 111 int scopes_pcs_size; 112 int dependencies_size; 113 int handler_table_size; 114 int nul_chk_table_size; 115 int oops_size; 116 int metadata_size; 117 118 void note_nmethod(nmethod* nm) { 119 nmethod_count += 1; 120 total_size += nm->size(); 121 relocation_size += nm->relocation_size(); 122 consts_size += nm->consts_size(); 123 insts_size += nm->insts_size(); 124 stub_size += nm->stub_size(); 125 oops_size += nm->oops_size(); 126 metadata_size += nm->metadata_size(); 127 scopes_data_size += nm->scopes_data_size(); 128 scopes_pcs_size += nm->scopes_pcs_size(); 129 dependencies_size += nm->dependencies_size(); 130 handler_table_size += nm->handler_table_size(); 131 nul_chk_table_size += nm->nul_chk_table_size(); 132 } 133 void print_nmethod_stats(const char* name) { 134 if (nmethod_count == 0) return; 135 tty->print_cr("Statistics for %d bytecoded nmethods for %s:", nmethod_count, name); 136 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size); 137 if (nmethod_count != 0) tty->print_cr(" header = " SIZE_FORMAT, nmethod_count * sizeof(nmethod)); 138 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size); 139 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size); 140 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size); 141 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size); 142 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size); 143 if (metadata_size != 0) tty->print_cr(" metadata = %d", metadata_size); 144 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size); 145 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size); 146 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size); 147 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size); 148 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size); 149 } 150 }; 151 152 struct native_nmethod_stats_struct { 153 int native_nmethod_count; 154 int native_total_size; 155 int native_relocation_size; 156 int native_insts_size; 157 int native_oops_size; 158 int native_metadata_size; 159 void note_native_nmethod(nmethod* nm) { 160 native_nmethod_count += 1; 161 native_total_size += nm->size(); 162 native_relocation_size += nm->relocation_size(); 163 native_insts_size += nm->insts_size(); 164 native_oops_size += nm->oops_size(); 165 native_metadata_size += nm->metadata_size(); 166 } 167 void print_native_nmethod_stats() { 168 if (native_nmethod_count == 0) return; 169 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count); 170 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size); 171 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size); 172 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size); 173 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size); 174 if (native_metadata_size != 0) tty->print_cr(" N. metadata = %d", native_metadata_size); 175 } 176 }; 177 178 struct pc_nmethod_stats_struct { 179 int pc_desc_resets; // number of resets (= number of caches) 180 int pc_desc_queries; // queries to nmethod::find_pc_desc 181 int pc_desc_approx; // number of those which have approximate true 182 int pc_desc_repeats; // number of _pc_descs[0] hits 183 int pc_desc_hits; // number of LRU cache hits 184 int pc_desc_tests; // total number of PcDesc examinations 185 int pc_desc_searches; // total number of quasi-binary search steps 186 int pc_desc_adds; // number of LUR cache insertions 187 188 void print_pc_stats() { 189 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query", 190 pc_desc_queries, 191 (double)(pc_desc_tests + pc_desc_searches) 192 / pc_desc_queries); 193 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d", 194 pc_desc_resets, 195 pc_desc_queries, pc_desc_approx, 196 pc_desc_repeats, pc_desc_hits, 197 pc_desc_tests, pc_desc_searches, pc_desc_adds); 198 } 199 }; 200 201 #ifdef COMPILER1 202 static java_nmethod_stats_struct c1_java_nmethod_stats; 203 #endif 204 #ifdef COMPILER2 205 static java_nmethod_stats_struct c2_java_nmethod_stats; 206 #endif 207 #if INCLUDE_JVMCI 208 static java_nmethod_stats_struct jvmci_java_nmethod_stats; 209 #endif 210 static java_nmethod_stats_struct unknown_java_nmethod_stats; 211 212 static native_nmethod_stats_struct native_nmethod_stats; 213 static pc_nmethod_stats_struct pc_nmethod_stats; 214 215 static void note_java_nmethod(nmethod* nm) { 216 #ifdef COMPILER1 217 if (nm->is_compiled_by_c1()) { 218 c1_java_nmethod_stats.note_nmethod(nm); 219 } else 220 #endif 221 #ifdef COMPILER2 222 if (nm->is_compiled_by_c2()) { 223 c2_java_nmethod_stats.note_nmethod(nm); 224 } else 225 #endif 226 #if INCLUDE_JVMCI 227 if (nm->is_compiled_by_jvmci()) { 228 jvmci_java_nmethod_stats.note_nmethod(nm); 229 } else 230 #endif 231 { 232 unknown_java_nmethod_stats.note_nmethod(nm); 233 } 234 } 235 #endif // !PRODUCT 236 237 //--------------------------------------------------------------------------------- 238 239 240 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) { 241 assert(pc != NULL, "Must be non null"); 242 assert(exception.not_null(), "Must be non null"); 243 assert(handler != NULL, "Must be non null"); 244 245 _count = 0; 246 _exception_type = exception->klass(); 247 _next = NULL; 248 _purge_list_next = NULL; 249 250 add_address_and_handler(pc,handler); 251 } 252 253 254 address ExceptionCache::match(Handle exception, address pc) { 255 assert(pc != NULL,"Must be non null"); 256 assert(exception.not_null(),"Must be non null"); 257 if (exception->klass() == exception_type()) { 258 return (test_address(pc)); 259 } 260 261 return NULL; 262 } 263 264 265 bool ExceptionCache::match_exception_with_space(Handle exception) { 266 assert(exception.not_null(),"Must be non null"); 267 if (exception->klass() == exception_type() && count() < cache_size) { 268 return true; 269 } 270 return false; 271 } 272 273 274 address ExceptionCache::test_address(address addr) { 275 int limit = count(); 276 for (int i = 0; i < limit; i++) { 277 if (pc_at(i) == addr) { 278 return handler_at(i); 279 } 280 } 281 return NULL; 282 } 283 284 285 bool ExceptionCache::add_address_and_handler(address addr, address handler) { 286 if (test_address(addr) == handler) return true; 287 288 int index = count(); 289 if (index < cache_size) { 290 set_pc_at(index, addr); 291 set_handler_at(index, handler); 292 increment_count(); 293 return true; 294 } 295 return false; 296 } 297 298 ExceptionCache* ExceptionCache::next() { 299 return Atomic::load(&_next); 300 } 301 302 void ExceptionCache::set_next(ExceptionCache *ec) { 303 Atomic::store(ec, &_next); 304 } 305 306 //----------------------------------------------------------------------------- 307 308 309 // Helper used by both find_pc_desc methods. 310 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) { 311 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_tests); 312 if (!approximate) 313 return pc->pc_offset() == pc_offset; 314 else 315 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset(); 316 } 317 318 void PcDescCache::reset_to(PcDesc* initial_pc_desc) { 319 if (initial_pc_desc == NULL) { 320 _pc_descs[0] = NULL; // native method; no PcDescs at all 321 return; 322 } 323 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_resets); 324 // reset the cache by filling it with benign (non-null) values 325 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel"); 326 for (int i = 0; i < cache_size; i++) 327 _pc_descs[i] = initial_pc_desc; 328 } 329 330 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) { 331 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_queries); 332 NOT_PRODUCT(if (approximate) ++pc_nmethod_stats.pc_desc_approx); 333 334 // Note: one might think that caching the most recently 335 // read value separately would be a win, but one would be 336 // wrong. When many threads are updating it, the cache 337 // line it's in would bounce between caches, negating 338 // any benefit. 339 340 // In order to prevent race conditions do not load cache elements 341 // repeatedly, but use a local copy: 342 PcDesc* res; 343 344 // Step one: Check the most recently added value. 345 res = _pc_descs[0]; 346 if (res == NULL) return NULL; // native method; no PcDescs at all 347 if (match_desc(res, pc_offset, approximate)) { 348 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_repeats); 349 return res; 350 } 351 352 // Step two: Check the rest of the LRU cache. 353 for (int i = 1; i < cache_size; ++i) { 354 res = _pc_descs[i]; 355 if (res->pc_offset() < 0) break; // optimization: skip empty cache 356 if (match_desc(res, pc_offset, approximate)) { 357 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_hits); 358 return res; 359 } 360 } 361 362 // Report failure. 363 return NULL; 364 } 365 366 void PcDescCache::add_pc_desc(PcDesc* pc_desc) { 367 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_adds); 368 // Update the LRU cache by shifting pc_desc forward. 369 for (int i = 0; i < cache_size; i++) { 370 PcDesc* next = _pc_descs[i]; 371 _pc_descs[i] = pc_desc; 372 pc_desc = next; 373 } 374 } 375 376 // adjust pcs_size so that it is a multiple of both oopSize and 377 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple 378 // of oopSize, then 2*sizeof(PcDesc) is) 379 static int adjust_pcs_size(int pcs_size) { 380 int nsize = align_up(pcs_size, oopSize); 381 if ((nsize % sizeof(PcDesc)) != 0) { 382 nsize = pcs_size + sizeof(PcDesc); 383 } 384 assert((nsize % oopSize) == 0, "correct alignment"); 385 return nsize; 386 } 387 388 389 int nmethod::total_size() const { 390 return 391 consts_size() + 392 insts_size() + 393 stub_size() + 394 scopes_data_size() + 395 scopes_pcs_size() + 396 handler_table_size() + 397 nul_chk_table_size(); 398 } 399 400 address* nmethod::orig_pc_addr(const frame* fr) { 401 return (address*) ((address)fr->unextended_sp() + _orig_pc_offset); 402 } 403 404 const char* nmethod::compile_kind() const { 405 if (is_osr_method()) return "osr"; 406 if (method() != NULL && is_native_method()) return "c2n"; 407 return NULL; 408 } 409 410 // Fill in default values for various flag fields 411 void nmethod::init_defaults() { 412 _state = not_installed; 413 _has_flushed_dependencies = 0; 414 _lock_count = 0; 415 _stack_traversal_mark = 0; 416 _unload_reported = false; // jvmti state 417 _is_far_code = false; // nmethods are located in CodeCache 418 419 #ifdef ASSERT 420 _oops_are_stale = false; 421 #endif 422 423 _oops_do_mark_link = NULL; 424 _jmethod_id = NULL; 425 _osr_link = NULL; 426 _scavenge_root_link = NULL; 427 _scavenge_root_state = 0; 428 #if INCLUDE_RTM_OPT 429 _rtm_state = NoRTM; 430 #endif 431 #if INCLUDE_JVMCI 432 _jvmci_installed_code = NULL; 433 _speculation_log = NULL; 434 _jvmci_installed_code_triggers_invalidation = false; 435 #endif 436 } 437 438 nmethod* nmethod::new_native_nmethod(const methodHandle& method, 439 int compile_id, 440 CodeBuffer *code_buffer, 441 int vep_offset, 442 int frame_complete, 443 int frame_size, 444 ByteSize basic_lock_owner_sp_offset, 445 ByteSize basic_lock_sp_offset, 446 OopMapSet* oop_maps) { 447 code_buffer->finalize_oop_references(method); 448 // create nmethod 449 nmethod* nm = NULL; 450 { 451 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 452 int native_nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod)); 453 CodeOffsets offsets; 454 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset); 455 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete); 456 nm = new (native_nmethod_size, CompLevel_none) nmethod(method(), compiler_none, native_nmethod_size, 457 compile_id, &offsets, 458 code_buffer, frame_size, 459 basic_lock_owner_sp_offset, 460 basic_lock_sp_offset, oop_maps); 461 NOT_PRODUCT(if (nm != NULL) native_nmethod_stats.note_native_nmethod(nm)); 462 } 463 464 if (nm != NULL) { 465 // verify nmethod 466 debug_only(nm->verify();) // might block 467 468 nm->log_new_nmethod(); 469 nm->make_in_use(); 470 } 471 return nm; 472 } 473 474 nmethod* nmethod::new_nmethod(const methodHandle& method, 475 int compile_id, 476 int entry_bci, 477 CodeOffsets* offsets, 478 int orig_pc_offset, 479 DebugInformationRecorder* debug_info, 480 Dependencies* dependencies, 481 CodeBuffer* code_buffer, int frame_size, 482 OopMapSet* oop_maps, 483 ExceptionHandlerTable* handler_table, 484 ImplicitExceptionTable* nul_chk_table, 485 AbstractCompiler* compiler, 486 int comp_level 487 #if INCLUDE_JVMCI 488 , jweak installed_code, 489 jweak speculationLog 490 #endif 491 ) 492 { 493 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); 494 code_buffer->finalize_oop_references(method); 495 // create nmethod 496 nmethod* nm = NULL; 497 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 498 int nmethod_size = 499 CodeBlob::allocation_size(code_buffer, sizeof(nmethod)) 500 + adjust_pcs_size(debug_info->pcs_size()) 501 + align_up((int)dependencies->size_in_bytes(), oopSize) 502 + align_up(handler_table->size_in_bytes() , oopSize) 503 + align_up(nul_chk_table->size_in_bytes() , oopSize) 504 + align_up(debug_info->data_size() , oopSize); 505 506 nm = new (nmethod_size, comp_level) 507 nmethod(method(), compiler->type(), nmethod_size, compile_id, entry_bci, offsets, 508 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size, 509 oop_maps, 510 handler_table, 511 nul_chk_table, 512 compiler, 513 comp_level 514 #if INCLUDE_JVMCI 515 , installed_code, 516 speculationLog 517 #endif 518 ); 519 520 if (nm != NULL) { 521 // To make dependency checking during class loading fast, record 522 // the nmethod dependencies in the classes it is dependent on. 523 // This allows the dependency checking code to simply walk the 524 // class hierarchy above the loaded class, checking only nmethods 525 // which are dependent on those classes. The slow way is to 526 // check every nmethod for dependencies which makes it linear in 527 // the number of methods compiled. For applications with a lot 528 // classes the slow way is too slow. 529 for (Dependencies::DepStream deps(nm); deps.next(); ) { 530 if (deps.type() == Dependencies::call_site_target_value) { 531 // CallSite dependencies are managed on per-CallSite instance basis. 532 oop call_site = deps.argument_oop(0); 533 MethodHandles::add_dependent_nmethod(call_site, nm); 534 } else { 535 Klass* klass = deps.context_type(); 536 if (klass == NULL) { 537 continue; // ignore things like evol_method 538 } 539 // record this nmethod as dependent on this klass 540 InstanceKlass::cast(klass)->add_dependent_nmethod(nm); 541 } 542 } 543 NOT_PRODUCT(if (nm != NULL) note_java_nmethod(nm)); 544 } 545 } 546 // Do verification and logging outside CodeCache_lock. 547 if (nm != NULL) { 548 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet. 549 DEBUG_ONLY(nm->verify();) 550 nm->log_new_nmethod(); 551 } 552 return nm; 553 } 554 555 // For native wrappers 556 nmethod::nmethod( 557 Method* method, 558 CompilerType type, 559 int nmethod_size, 560 int compile_id, 561 CodeOffsets* offsets, 562 CodeBuffer* code_buffer, 563 int frame_size, 564 ByteSize basic_lock_owner_sp_offset, 565 ByteSize basic_lock_sp_offset, 566 OopMapSet* oop_maps ) 567 : CompiledMethod(method, "native nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false), 568 _is_unloading_state(0), 569 _native_receiver_sp_offset(basic_lock_owner_sp_offset), 570 _native_basic_lock_sp_offset(basic_lock_sp_offset) 571 { 572 { 573 int scopes_data_offset = 0; 574 int deoptimize_offset = 0; 575 int deoptimize_mh_offset = 0; 576 577 debug_only(NoSafepointVerifier nsv;) 578 assert_locked_or_safepoint(CodeCache_lock); 579 580 init_defaults(); 581 _entry_bci = InvocationEntryBci; 582 // We have no exception handler or deopt handler make the 583 // values something that will never match a pc like the nmethod vtable entry 584 _exception_offset = 0; 585 _orig_pc_offset = 0; 586 587 _consts_offset = data_offset(); 588 _stub_offset = data_offset(); 589 _oops_offset = data_offset(); 590 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize); 591 scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize); 592 _scopes_pcs_offset = scopes_data_offset; 593 _dependencies_offset = _scopes_pcs_offset; 594 _handler_table_offset = _dependencies_offset; 595 _nul_chk_table_offset = _handler_table_offset; 596 _nmethod_end_offset = _nul_chk_table_offset; 597 _compile_id = compile_id; 598 _comp_level = CompLevel_none; 599 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 600 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 601 _osr_entry_point = NULL; 602 _exception_cache = NULL; 603 _pc_desc_container.reset_to(NULL); 604 _hotness_counter = NMethodSweeper::hotness_counter_reset_val(); 605 606 _scopes_data_begin = (address) this + scopes_data_offset; 607 _deopt_handler_begin = (address) this + deoptimize_offset; 608 _deopt_mh_handler_begin = (address) this + deoptimize_mh_offset; 609 610 code_buffer->copy_code_and_locs_to(this); 611 code_buffer->copy_values_to(this); 612 613 clear_unloading_state(); 614 615 Universe::heap()->register_nmethod(this); 616 debug_only(Universe::heap()->verify_nmethod(this)); 617 618 CodeCache::commit(this); 619 } 620 621 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) { 622 ttyLocker ttyl; // keep the following output all in one block 623 // This output goes directly to the tty, not the compiler log. 624 // To enable tools to match it up with the compilation activity, 625 // be sure to tag this tty output with the compile ID. 626 if (xtty != NULL) { 627 xtty->begin_head("print_native_nmethod"); 628 xtty->method(_method); 629 xtty->stamp(); 630 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this); 631 } 632 // print the header part first 633 print(); 634 // then print the requested information 635 if (PrintNativeNMethods) { 636 print_code(); 637 if (oop_maps != NULL) { 638 oop_maps->print(); 639 } 640 } 641 if (PrintRelocations) { 642 print_relocations(); 643 } 644 if (xtty != NULL) { 645 xtty->tail("print_native_nmethod"); 646 } 647 } 648 } 649 650 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () { 651 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level)); 652 } 653 654 nmethod::nmethod( 655 Method* method, 656 CompilerType type, 657 int nmethod_size, 658 int compile_id, 659 int entry_bci, 660 CodeOffsets* offsets, 661 int orig_pc_offset, 662 DebugInformationRecorder* debug_info, 663 Dependencies* dependencies, 664 CodeBuffer *code_buffer, 665 int frame_size, 666 OopMapSet* oop_maps, 667 ExceptionHandlerTable* handler_table, 668 ImplicitExceptionTable* nul_chk_table, 669 AbstractCompiler* compiler, 670 int comp_level 671 #if INCLUDE_JVMCI 672 , jweak installed_code, 673 jweak speculation_log 674 #endif 675 ) 676 : CompiledMethod(method, "nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false), 677 _is_unloading_state(0), 678 _native_receiver_sp_offset(in_ByteSize(-1)), 679 _native_basic_lock_sp_offset(in_ByteSize(-1)) 680 { 681 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); 682 { 683 debug_only(NoSafepointVerifier nsv;) 684 assert_locked_or_safepoint(CodeCache_lock); 685 686 _deopt_handler_begin = (address) this; 687 _deopt_mh_handler_begin = (address) this; 688 689 init_defaults(); 690 _entry_bci = entry_bci; 691 _compile_id = compile_id; 692 _comp_level = comp_level; 693 _orig_pc_offset = orig_pc_offset; 694 _hotness_counter = NMethodSweeper::hotness_counter_reset_val(); 695 696 // Section offsets 697 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts()); 698 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs()); 699 set_ctable_begin(header_begin() + _consts_offset); 700 701 #if INCLUDE_JVMCI 702 _jvmci_installed_code = installed_code; 703 _speculation_log = speculation_log; 704 oop obj = JNIHandles::resolve(installed_code); 705 if (obj == NULL || (obj->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(obj))) { 706 _jvmci_installed_code_triggers_invalidation = false; 707 } else { 708 _jvmci_installed_code_triggers_invalidation = true; 709 } 710 711 if (compiler->is_jvmci()) { 712 // JVMCI might not produce any stub sections 713 if (offsets->value(CodeOffsets::Exceptions) != -1) { 714 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions); 715 } else { 716 _exception_offset = -1; 717 } 718 if (offsets->value(CodeOffsets::Deopt) != -1) { 719 _deopt_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::Deopt); 720 } else { 721 _deopt_handler_begin = NULL; 722 } 723 if (offsets->value(CodeOffsets::DeoptMH) != -1) { 724 _deopt_mh_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::DeoptMH); 725 } else { 726 _deopt_mh_handler_begin = NULL; 727 } 728 } else { 729 #endif 730 // Exception handler and deopt handler are in the stub section 731 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set"); 732 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set"); 733 734 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions); 735 _deopt_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::Deopt); 736 if (offsets->value(CodeOffsets::DeoptMH) != -1) { 737 _deopt_mh_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::DeoptMH); 738 } else { 739 _deopt_mh_handler_begin = NULL; 740 #if INCLUDE_JVMCI 741 } 742 #endif 743 } 744 if (offsets->value(CodeOffsets::UnwindHandler) != -1) { 745 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler); 746 } else { 747 _unwind_handler_offset = -1; 748 } 749 750 _oops_offset = data_offset(); 751 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize); 752 int scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize); 753 754 _scopes_pcs_offset = scopes_data_offset + align_up(debug_info->data_size (), oopSize); 755 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size()); 756 _handler_table_offset = _dependencies_offset + align_up((int)dependencies->size_in_bytes (), oopSize); 757 _nul_chk_table_offset = _handler_table_offset + align_up(handler_table->size_in_bytes(), oopSize); 758 _nmethod_end_offset = _nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize); 759 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 760 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 761 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry); 762 _exception_cache = NULL; 763 764 _scopes_data_begin = (address) this + scopes_data_offset; 765 766 _pc_desc_container.reset_to(scopes_pcs_begin()); 767 768 code_buffer->copy_code_and_locs_to(this); 769 // Copy contents of ScopeDescRecorder to nmethod 770 code_buffer->copy_values_to(this); 771 debug_info->copy_to(this); 772 dependencies->copy_to(this); 773 clear_unloading_state(); 774 775 Universe::heap()->register_nmethod(this); 776 debug_only(Universe::heap()->verify_nmethod(this)); 777 778 CodeCache::commit(this); 779 780 // Copy contents of ExceptionHandlerTable to nmethod 781 handler_table->copy_to(this); 782 nul_chk_table->copy_to(this); 783 784 // we use the information of entry points to find out if a method is 785 // static or non static 786 assert(compiler->is_c2() || compiler->is_jvmci() || 787 _method->is_static() == (entry_point() == _verified_entry_point), 788 " entry points must be same for static methods and vice versa"); 789 } 790 } 791 792 // Print a short set of xml attributes to identify this nmethod. The 793 // output should be embedded in some other element. 794 void nmethod::log_identity(xmlStream* log) const { 795 log->print(" compile_id='%d'", compile_id()); 796 const char* nm_kind = compile_kind(); 797 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind); 798 log->print(" compiler='%s'", compiler_name()); 799 if (TieredCompilation) { 800 log->print(" level='%d'", comp_level()); 801 } 802 #if INCLUDE_JVMCI 803 char buffer[O_BUFLEN]; 804 char* jvmci_name = jvmci_installed_code_name(buffer, O_BUFLEN); 805 if (jvmci_name != NULL) { 806 log->print(" jvmci_installed_code_name='"); 807 log->text("%s", jvmci_name); 808 log->print("'"); 809 } 810 #endif 811 } 812 813 814 #define LOG_OFFSET(log, name) \ 815 if (p2i(name##_end()) - p2i(name##_begin())) \ 816 log->print(" " XSTR(name) "_offset='" INTX_FORMAT "'" , \ 817 p2i(name##_begin()) - p2i(this)) 818 819 820 void nmethod::log_new_nmethod() const { 821 if (LogCompilation && xtty != NULL) { 822 ttyLocker ttyl; 823 HandleMark hm; 824 xtty->begin_elem("nmethod"); 825 log_identity(xtty); 826 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size()); 827 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this)); 828 829 LOG_OFFSET(xtty, relocation); 830 LOG_OFFSET(xtty, consts); 831 LOG_OFFSET(xtty, insts); 832 LOG_OFFSET(xtty, stub); 833 LOG_OFFSET(xtty, scopes_data); 834 LOG_OFFSET(xtty, scopes_pcs); 835 LOG_OFFSET(xtty, dependencies); 836 LOG_OFFSET(xtty, handler_table); 837 LOG_OFFSET(xtty, nul_chk_table); 838 LOG_OFFSET(xtty, oops); 839 LOG_OFFSET(xtty, metadata); 840 841 xtty->method(method()); 842 xtty->stamp(); 843 xtty->end_elem(); 844 } 845 } 846 847 #undef LOG_OFFSET 848 849 850 // Print out more verbose output usually for a newly created nmethod. 851 void nmethod::print_on(outputStream* st, const char* msg) const { 852 if (st != NULL) { 853 ttyLocker ttyl; 854 if (WizardMode) { 855 CompileTask::print(st, this, msg, /*short_form:*/ true); 856 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this)); 857 } else { 858 CompileTask::print(st, this, msg, /*short_form:*/ false); 859 } 860 } 861 } 862 863 void nmethod::maybe_print_nmethod(DirectiveSet* directive) { 864 bool printnmethods = directive->PrintAssemblyOption || directive->PrintNMethodsOption; 865 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) { 866 print_nmethod(printnmethods); 867 } 868 } 869 870 void nmethod::print_nmethod(bool printmethod) { 871 ttyLocker ttyl; // keep the following output all in one block 872 if (xtty != NULL) { 873 xtty->begin_head("print_nmethod"); 874 xtty->stamp(); 875 xtty->end_head(); 876 } 877 // print the header part first 878 print(); 879 // then print the requested information 880 if (printmethod) { 881 print_code(); 882 print_pcs(); 883 if (oop_maps()) { 884 oop_maps()->print(); 885 } 886 } 887 if (printmethod || PrintDebugInfo || CompilerOracle::has_option_string(_method, "PrintDebugInfo")) { 888 print_scopes(); 889 } 890 if (printmethod || PrintRelocations || CompilerOracle::has_option_string(_method, "PrintRelocations")) { 891 print_relocations(); 892 } 893 if (printmethod || PrintDependencies || CompilerOracle::has_option_string(_method, "PrintDependencies")) { 894 print_dependencies(); 895 } 896 if (printmethod || PrintExceptionHandlers) { 897 print_handler_table(); 898 print_nul_chk_table(); 899 } 900 if (printmethod) { 901 print_recorded_oops(); 902 print_recorded_metadata(); 903 } 904 if (xtty != NULL) { 905 xtty->tail("print_nmethod"); 906 } 907 } 908 909 910 // Promote one word from an assembly-time handle to a live embedded oop. 911 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) { 912 if (handle == NULL || 913 // As a special case, IC oops are initialized to 1 or -1. 914 handle == (jobject) Universe::non_oop_word()) { 915 (*dest) = (oop) handle; 916 } else { 917 (*dest) = JNIHandles::resolve_non_null(handle); 918 } 919 } 920 921 922 // Have to have the same name because it's called by a template 923 void nmethod::copy_values(GrowableArray<jobject>* array) { 924 int length = array->length(); 925 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough"); 926 oop* dest = oops_begin(); 927 for (int index = 0 ; index < length; index++) { 928 initialize_immediate_oop(&dest[index], array->at(index)); 929 } 930 931 // Now we can fix up all the oops in the code. We need to do this 932 // in the code because the assembler uses jobjects as placeholders. 933 // The code and relocations have already been initialized by the 934 // CodeBlob constructor, so it is valid even at this early point to 935 // iterate over relocations and patch the code. 936 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true); 937 } 938 939 void nmethod::copy_values(GrowableArray<Metadata*>* array) { 940 int length = array->length(); 941 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough"); 942 Metadata** dest = metadata_begin(); 943 for (int index = 0 ; index < length; index++) { 944 dest[index] = array->at(index); 945 } 946 } 947 948 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) { 949 // re-patch all oop-bearing instructions, just in case some oops moved 950 RelocIterator iter(this, begin, end); 951 while (iter.next()) { 952 if (iter.type() == relocInfo::oop_type) { 953 oop_Relocation* reloc = iter.oop_reloc(); 954 if (initialize_immediates && reloc->oop_is_immediate()) { 955 oop* dest = reloc->oop_addr(); 956 initialize_immediate_oop(dest, (jobject) *dest); 957 } 958 // Refresh the oop-related bits of this instruction. 959 reloc->fix_oop_relocation(); 960 } else if (iter.type() == relocInfo::metadata_type) { 961 metadata_Relocation* reloc = iter.metadata_reloc(); 962 reloc->fix_metadata_relocation(); 963 } 964 } 965 } 966 967 968 void nmethod::verify_clean_inline_caches() { 969 assert(CompiledICLocker::is_safe(this), "mt unsafe call"); 970 971 ResourceMark rm; 972 RelocIterator iter(this, oops_reloc_begin()); 973 while(iter.next()) { 974 switch(iter.type()) { 975 case relocInfo::virtual_call_type: 976 case relocInfo::opt_virtual_call_type: { 977 CompiledIC *ic = CompiledIC_at(&iter); 978 // Ok, to lookup references to zombies here 979 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination()); 980 assert(cb != NULL, "destination not in CodeBlob?"); 981 nmethod* nm = cb->as_nmethod_or_null(); 982 if( nm != NULL ) { 983 // Verify that inline caches pointing to both zombie and not_entrant methods are clean 984 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 985 assert(ic->is_clean(), "IC should be clean"); 986 } 987 } 988 break; 989 } 990 case relocInfo::static_call_type: { 991 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc()); 992 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination()); 993 assert(cb != NULL, "destination not in CodeBlob?"); 994 nmethod* nm = cb->as_nmethod_or_null(); 995 if( nm != NULL ) { 996 // Verify that inline caches pointing to both zombie and not_entrant methods are clean 997 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 998 assert(csc->is_clean(), "IC should be clean"); 999 } 1000 } 1001 break; 1002 } 1003 default: 1004 break; 1005 } 1006 } 1007 } 1008 1009 // This is a private interface with the sweeper. 1010 void nmethod::mark_as_seen_on_stack() { 1011 assert(is_alive(), "Must be an alive method"); 1012 // Set the traversal mark to ensure that the sweeper does 2 1013 // cleaning passes before moving to zombie. 1014 set_stack_traversal_mark(NMethodSweeper::traversal_count()); 1015 } 1016 1017 // Tell if a non-entrant method can be converted to a zombie (i.e., 1018 // there are no activations on the stack, not in use by the VM, 1019 // and not in use by the ServiceThread) 1020 bool nmethod::can_convert_to_zombie() { 1021 // Note that this is called when the sweeper has observed the nmethod to be 1022 // not_entrant. However, with concurrent code cache unloading, the state 1023 // might have moved on to unloaded if it is_unloading(), due to racing 1024 // concurrent GC threads. 1025 assert(is_not_entrant() || is_unloading(), "must be a non-entrant method"); 1026 1027 // Since the nmethod sweeper only does partial sweep the sweeper's traversal 1028 // count can be greater than the stack traversal count before it hits the 1029 // nmethod for the second time. 1030 // If an is_unloading() nmethod is still not_entrant, then it is not safe to 1031 // convert it to zombie due to GC unloading interactions. However, if it 1032 // has become unloaded, then it is okay to convert such nmethods to zombie. 1033 return stack_traversal_mark() + 1 < NMethodSweeper::traversal_count() && 1034 !is_locked_by_vm() && (!is_unloading() || is_unloaded()); 1035 } 1036 1037 void nmethod::inc_decompile_count() { 1038 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return; 1039 // Could be gated by ProfileTraps, but do not bother... 1040 Method* m = method(); 1041 if (m == NULL) return; 1042 MethodData* mdo = m->method_data(); 1043 if (mdo == NULL) return; 1044 // There is a benign race here. See comments in methodData.hpp. 1045 mdo->inc_decompile_count(); 1046 } 1047 1048 void nmethod::make_unloaded() { 1049 post_compiled_method_unload(); 1050 1051 // This nmethod is being unloaded, make sure that dependencies 1052 // recorded in instanceKlasses get flushed. 1053 // Since this work is being done during a GC, defer deleting dependencies from the 1054 // InstanceKlass. 1055 assert(Universe::heap()->is_gc_active() || Thread::current()->is_ConcurrentGC_thread(), 1056 "should only be called during gc"); 1057 flush_dependencies(/*delete_immediately*/false); 1058 1059 // Break cycle between nmethod & method 1060 LogTarget(Trace, class, unload, nmethod) lt; 1061 if (lt.is_enabled()) { 1062 LogStream ls(lt); 1063 ls.print("making nmethod " INTPTR_FORMAT 1064 " unloadable, Method*(" INTPTR_FORMAT 1065 ") ", 1066 p2i(this), p2i(_method)); 1067 ls.cr(); 1068 } 1069 // Unlink the osr method, so we do not look this up again 1070 if (is_osr_method()) { 1071 // Invalidate the osr nmethod only once 1072 if (is_in_use()) { 1073 invalidate_osr_method(); 1074 } 1075 #ifdef ASSERT 1076 if (method() != NULL) { 1077 // Make sure osr nmethod is invalidated, i.e. not on the list 1078 bool found = method()->method_holder()->remove_osr_nmethod(this); 1079 assert(!found, "osr nmethod should have been invalidated"); 1080 } 1081 #endif 1082 } 1083 1084 // If _method is already NULL the Method* is about to be unloaded, 1085 // so we don't have to break the cycle. Note that it is possible to 1086 // have the Method* live here, in case we unload the nmethod because 1087 // it is pointing to some oop (other than the Method*) being unloaded. 1088 if (_method != NULL) { 1089 // OSR methods point to the Method*, but the Method* does not 1090 // point back! 1091 if (_method->code() == this) { 1092 _method->clear_code(); // Break a cycle 1093 } 1094 _method = NULL; // Clear the method of this dead nmethod 1095 } 1096 1097 // Make the class unloaded - i.e., change state and notify sweeper 1098 assert(SafepointSynchronize::is_at_safepoint() || Thread::current()->is_ConcurrentGC_thread(), 1099 "must be at safepoint"); 1100 1101 { 1102 // Clear ICStubs and release any CompiledICHolders. 1103 CompiledICLocker ml(this); 1104 clear_ic_callsites(); 1105 } 1106 1107 // Unregister must be done before the state change 1108 { 1109 MutexLockerEx ml(SafepointSynchronize::is_at_safepoint() ? NULL : CodeCache_lock, 1110 Mutex::_no_safepoint_check_flag); 1111 Universe::heap()->unregister_nmethod(this); 1112 } 1113 1114 // Log the unloading. 1115 log_state_change(); 1116 1117 #if INCLUDE_JVMCI 1118 // The method can only be unloaded after the pointer to the installed code 1119 // Java wrapper is no longer alive. Here we need to clear out this weak 1120 // reference to the dead object. 1121 maybe_invalidate_installed_code(); 1122 #endif 1123 1124 // The Method* is gone at this point 1125 assert(_method == NULL, "Tautology"); 1126 1127 set_osr_link(NULL); 1128 NMethodSweeper::report_state_change(this); 1129 1130 // The release is only needed for compile-time ordering, as accesses 1131 // into the nmethod after the store are not safe due to the sweeper 1132 // being allowed to free it when the store is observed, during 1133 // concurrent nmethod unloading. Therefore, there is no need for 1134 // acquire on the loader side. 1135 OrderAccess::release_store(&_state, (signed char)unloaded); 1136 } 1137 1138 void nmethod::invalidate_osr_method() { 1139 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); 1140 // Remove from list of active nmethods 1141 if (method() != NULL) { 1142 method()->method_holder()->remove_osr_nmethod(this); 1143 } 1144 } 1145 1146 void nmethod::log_state_change() const { 1147 if (LogCompilation) { 1148 if (xtty != NULL) { 1149 ttyLocker ttyl; // keep the following output all in one block 1150 if (_state == unloaded) { 1151 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'", 1152 os::current_thread_id()); 1153 } else { 1154 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s", 1155 os::current_thread_id(), 1156 (_state == zombie ? " zombie='1'" : "")); 1157 } 1158 log_identity(xtty); 1159 xtty->stamp(); 1160 xtty->end_elem(); 1161 } 1162 } 1163 1164 const char *state_msg = _state == zombie ? "made zombie" : "made not entrant"; 1165 CompileTask::print_ul(this, state_msg); 1166 if (PrintCompilation && _state != unloaded) { 1167 print_on(tty, state_msg); 1168 } 1169 } 1170 1171 void nmethod::unlink_from_method(bool acquire_lock) { 1172 // We need to check if both the _code and _from_compiled_code_entry_point 1173 // refer to this nmethod because there is a race in setting these two fields 1174 // in Method* as seen in bugid 4947125. 1175 // If the vep() points to the zombie nmethod, the memory for the nmethod 1176 // could be flushed and the compiler and vtable stubs could still call 1177 // through it. 1178 if (method() != NULL && (method()->code() == this || 1179 method()->from_compiled_entry() == verified_entry_point())) { 1180 method()->clear_code(acquire_lock); 1181 } 1182 } 1183 1184 /** 1185 * Common functionality for both make_not_entrant and make_zombie 1186 */ 1187 bool nmethod::make_not_entrant_or_zombie(int state) { 1188 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant"); 1189 assert(!is_zombie(), "should not already be a zombie"); 1190 1191 if (_state == state) { 1192 // Avoid taking the lock if already in required state. 1193 // This is safe from races because the state is an end-state, 1194 // which the nmethod cannot back out of once entered. 1195 // No need for fencing either. 1196 return false; 1197 } 1198 1199 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below. 1200 nmethodLocker nml(this); 1201 methodHandle the_method(method()); 1202 // This can be called while the system is already at a safepoint which is ok 1203 NoSafepointVerifier nsv(true, !SafepointSynchronize::is_at_safepoint()); 1204 1205 // during patching, depending on the nmethod state we must notify the GC that 1206 // code has been unloaded, unregistering it. We cannot do this right while 1207 // holding the Patching_lock because we need to use the CodeCache_lock. This 1208 // would be prone to deadlocks. 1209 // This flag is used to remember whether we need to later lock and unregister. 1210 bool nmethod_needs_unregister = false; 1211 1212 { 1213 // invalidate osr nmethod before acquiring the patching lock since 1214 // they both acquire leaf locks and we don't want a deadlock. 1215 // This logic is equivalent to the logic below for patching the 1216 // verified entry point of regular methods. We check that the 1217 // nmethod is in use to ensure that it is invalidated only once. 1218 if (is_osr_method() && is_in_use()) { 1219 // this effectively makes the osr nmethod not entrant 1220 invalidate_osr_method(); 1221 } 1222 1223 // Enter critical section. Does not block for safepoint. 1224 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 1225 1226 if (_state == state) { 1227 // another thread already performed this transition so nothing 1228 // to do, but return false to indicate this. 1229 return false; 1230 } 1231 1232 // The caller can be calling the method statically or through an inline 1233 // cache call. 1234 if (!is_osr_method() && !is_not_entrant()) { 1235 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(), 1236 SharedRuntime::get_handle_wrong_method_stub()); 1237 } 1238 1239 if (is_in_use() && update_recompile_counts()) { 1240 // It's a true state change, so mark the method as decompiled. 1241 // Do it only for transition from alive. 1242 inc_decompile_count(); 1243 } 1244 1245 // If the state is becoming a zombie, signal to unregister the nmethod with 1246 // the heap. 1247 // This nmethod may have already been unloaded during a full GC. 1248 if ((state == zombie) && !is_unloaded()) { 1249 nmethod_needs_unregister = true; 1250 } 1251 1252 // Must happen before state change. Otherwise we have a race condition in 1253 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately 1254 // transition its state from 'not_entrant' to 'zombie' without having to wait 1255 // for stack scanning. 1256 if (state == not_entrant) { 1257 mark_as_seen_on_stack(); 1258 OrderAccess::storestore(); // _stack_traversal_mark and _state 1259 } 1260 1261 // Change state 1262 _state = state; 1263 1264 // Log the transition once 1265 log_state_change(); 1266 1267 // Invalidate while holding the patching lock 1268 JVMCI_ONLY(maybe_invalidate_installed_code()); 1269 1270 // Remove nmethod from method. 1271 unlink_from_method(false /* already owns Patching_lock */); 1272 } // leave critical region under Patching_lock 1273 1274 #ifdef ASSERT 1275 if (is_osr_method() && method() != NULL) { 1276 // Make sure osr nmethod is invalidated, i.e. not on the list 1277 bool found = method()->method_holder()->remove_osr_nmethod(this); 1278 assert(!found, "osr nmethod should have been invalidated"); 1279 } 1280 #endif 1281 1282 // When the nmethod becomes zombie it is no longer alive so the 1283 // dependencies must be flushed. nmethods in the not_entrant 1284 // state will be flushed later when the transition to zombie 1285 // happens or they get unloaded. 1286 if (state == zombie) { 1287 { 1288 // Flushing dependencies must be done before any possible 1289 // safepoint can sneak in, otherwise the oops used by the 1290 // dependency logic could have become stale. 1291 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1292 if (nmethod_needs_unregister) { 1293 Universe::heap()->unregister_nmethod(this); 1294 } 1295 flush_dependencies(/*delete_immediately*/true); 1296 } 1297 1298 // Clear ICStubs to prevent back patching stubs of zombie or flushed 1299 // nmethods during the next safepoint (see ICStub::finalize), as well 1300 // as to free up CompiledICHolder resources. 1301 { 1302 CompiledICLocker ml(this); 1303 clear_ic_callsites(); 1304 } 1305 1306 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload 1307 // event and it hasn't already been reported for this nmethod then 1308 // report it now. The event may have been reported earlier if the GC 1309 // marked it for unloading). JvmtiDeferredEventQueue support means 1310 // we no longer go to a safepoint here. 1311 post_compiled_method_unload(); 1312 1313 #ifdef ASSERT 1314 // It's no longer safe to access the oops section since zombie 1315 // nmethods aren't scanned for GC. 1316 _oops_are_stale = true; 1317 #endif 1318 // the Method may be reclaimed by class unloading now that the 1319 // nmethod is in zombie state 1320 set_method(NULL); 1321 } else { 1322 assert(state == not_entrant, "other cases may need to be handled differently"); 1323 } 1324 1325 if (TraceCreateZombies) { 1326 ResourceMark m; 1327 tty->print_cr("nmethod <" INTPTR_FORMAT "> %s code made %s", p2i(this), this->method() ? this->method()->name_and_sig_as_C_string() : "null", (state == not_entrant) ? "not entrant" : "zombie"); 1328 } 1329 1330 NMethodSweeper::report_state_change(this); 1331 return true; 1332 } 1333 1334 void nmethod::flush() { 1335 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1336 // Note that there are no valid oops in the nmethod anymore. 1337 assert(!is_osr_method() || is_unloaded() || is_zombie(), 1338 "osr nmethod must be unloaded or zombie before flushing"); 1339 assert(is_zombie() || is_osr_method(), "must be a zombie method"); 1340 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed"); 1341 assert_locked_or_safepoint(CodeCache_lock); 1342 1343 // completely deallocate this method 1344 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, p2i(this)); 1345 if (PrintMethodFlushing) { 1346 tty->print_cr("*flushing %s nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT 1347 "/Free CodeCache:" SIZE_FORMAT "Kb", 1348 is_osr_method() ? "osr" : "",_compile_id, p2i(this), CodeCache::blob_count(), 1349 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024); 1350 } 1351 1352 // We need to deallocate any ExceptionCache data. 1353 // Note that we do not need to grab the nmethod lock for this, it 1354 // better be thread safe if we're disposing of it! 1355 ExceptionCache* ec = exception_cache(); 1356 set_exception_cache(NULL); 1357 while(ec != NULL) { 1358 ExceptionCache* next = ec->next(); 1359 delete ec; 1360 ec = next; 1361 } 1362 1363 if (on_scavenge_root_list()) { 1364 CodeCache::drop_scavenge_root_nmethod(this); 1365 } 1366 1367 #if INCLUDE_JVMCI 1368 assert(_jvmci_installed_code == NULL, "should have been nulled out when transitioned to zombie"); 1369 assert(_speculation_log == NULL, "should have been nulled out when transitioned to zombie"); 1370 #endif 1371 1372 Universe::heap()->flush_nmethod(this); 1373 1374 CodeBlob::flush(); 1375 CodeCache::free(this); 1376 } 1377 1378 oop nmethod::oop_at(int index) const { 1379 if (index == 0) { 1380 return NULL; 1381 } 1382 return NativeAccess<AS_NO_KEEPALIVE>::oop_load(oop_addr_at(index)); 1383 } 1384 1385 // 1386 // Notify all classes this nmethod is dependent on that it is no 1387 // longer dependent. This should only be called in two situations. 1388 // First, when a nmethod transitions to a zombie all dependents need 1389 // to be clear. Since zombification happens at a safepoint there's no 1390 // synchronization issues. The second place is a little more tricky. 1391 // During phase 1 of mark sweep class unloading may happen and as a 1392 // result some nmethods may get unloaded. In this case the flushing 1393 // of dependencies must happen during phase 1 since after GC any 1394 // dependencies in the unloaded nmethod won't be updated, so 1395 // traversing the dependency information in unsafe. In that case this 1396 // function is called with a boolean argument and this function only 1397 // notifies instanceKlasses that are reachable 1398 1399 void nmethod::flush_dependencies(bool delete_immediately) { 1400 DEBUG_ONLY(bool called_by_gc = Universe::heap()->is_gc_active() || Thread::current()->is_ConcurrentGC_thread();) 1401 assert(called_by_gc != delete_immediately, 1402 "delete_immediately is false if and only if we are called during GC"); 1403 if (!has_flushed_dependencies()) { 1404 set_has_flushed_dependencies(); 1405 for (Dependencies::DepStream deps(this); deps.next(); ) { 1406 if (deps.type() == Dependencies::call_site_target_value) { 1407 // CallSite dependencies are managed on per-CallSite instance basis. 1408 oop call_site = deps.argument_oop(0); 1409 if (delete_immediately) { 1410 assert_locked_or_safepoint(CodeCache_lock); 1411 MethodHandles::remove_dependent_nmethod(call_site, this); 1412 } else { 1413 MethodHandles::clean_dependency_context(call_site); 1414 } 1415 } else { 1416 Klass* klass = deps.context_type(); 1417 if (klass == NULL) { 1418 continue; // ignore things like evol_method 1419 } 1420 // During GC delete_immediately is false, and liveness 1421 // of dependee determines class that needs to be updated. 1422 if (delete_immediately) { 1423 assert_locked_or_safepoint(CodeCache_lock); 1424 InstanceKlass::cast(klass)->remove_dependent_nmethod(this); 1425 } else if (klass->is_loader_alive()) { 1426 // The GC may clean dependency contexts concurrently and in parallel. 1427 InstanceKlass::cast(klass)->clean_dependency_context(); 1428 } 1429 } 1430 } 1431 } 1432 } 1433 1434 // ------------------------------------------------------------------ 1435 // post_compiled_method_load_event 1436 // new method for install_code() path 1437 // Transfer information from compilation to jvmti 1438 void nmethod::post_compiled_method_load_event() { 1439 1440 Method* moop = method(); 1441 HOTSPOT_COMPILED_METHOD_LOAD( 1442 (char *) moop->klass_name()->bytes(), 1443 moop->klass_name()->utf8_length(), 1444 (char *) moop->name()->bytes(), 1445 moop->name()->utf8_length(), 1446 (char *) moop->signature()->bytes(), 1447 moop->signature()->utf8_length(), 1448 insts_begin(), insts_size()); 1449 1450 if (JvmtiExport::should_post_compiled_method_load() || 1451 JvmtiExport::should_post_compiled_method_unload()) { 1452 get_and_cache_jmethod_id(); 1453 } 1454 1455 if (JvmtiExport::should_post_compiled_method_load()) { 1456 // Let the Service thread (which is a real Java thread) post the event 1457 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); 1458 JvmtiDeferredEventQueue::enqueue( 1459 JvmtiDeferredEvent::compiled_method_load_event(this)); 1460 } 1461 } 1462 1463 jmethodID nmethod::get_and_cache_jmethod_id() { 1464 if (_jmethod_id == NULL) { 1465 // Cache the jmethod_id since it can no longer be looked up once the 1466 // method itself has been marked for unloading. 1467 _jmethod_id = method()->jmethod_id(); 1468 } 1469 return _jmethod_id; 1470 } 1471 1472 void nmethod::post_compiled_method_unload() { 1473 if (unload_reported()) { 1474 // During unloading we transition to unloaded and then to zombie 1475 // and the unloading is reported during the first transition. 1476 return; 1477 } 1478 1479 assert(_method != NULL && !is_unloaded(), "just checking"); 1480 DTRACE_METHOD_UNLOAD_PROBE(method()); 1481 1482 // If a JVMTI agent has enabled the CompiledMethodUnload event then 1483 // post the event. Sometime later this nmethod will be made a zombie 1484 // by the sweeper but the Method* will not be valid at that point. 1485 // If the _jmethod_id is null then no load event was ever requested 1486 // so don't bother posting the unload. The main reason for this is 1487 // that the jmethodID is a weak reference to the Method* so if 1488 // it's being unloaded there's no way to look it up since the weak 1489 // ref will have been cleared. 1490 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) { 1491 assert(!unload_reported(), "already unloaded"); 1492 JvmtiDeferredEvent event = 1493 JvmtiDeferredEvent::compiled_method_unload_event(this, 1494 _jmethod_id, insts_begin()); 1495 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); 1496 JvmtiDeferredEventQueue::enqueue(event); 1497 } 1498 1499 // The JVMTI CompiledMethodUnload event can be enabled or disabled at 1500 // any time. As the nmethod is being unloaded now we mark it has 1501 // having the unload event reported - this will ensure that we don't 1502 // attempt to report the event in the unlikely scenario where the 1503 // event is enabled at the time the nmethod is made a zombie. 1504 set_unload_reported(); 1505 } 1506 1507 // Iterate over metadata calling this function. Used by RedefineClasses 1508 void nmethod::metadata_do(void f(Metadata*)) { 1509 { 1510 // Visit all immediate references that are embedded in the instruction stream. 1511 RelocIterator iter(this, oops_reloc_begin()); 1512 while (iter.next()) { 1513 if (iter.type() == relocInfo::metadata_type ) { 1514 metadata_Relocation* r = iter.metadata_reloc(); 1515 // In this metadata, we must only follow those metadatas directly embedded in 1516 // the code. Other metadatas (oop_index>0) are seen as part of 1517 // the metadata section below. 1518 assert(1 == (r->metadata_is_immediate()) + 1519 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()), 1520 "metadata must be found in exactly one place"); 1521 if (r->metadata_is_immediate() && r->metadata_value() != NULL) { 1522 Metadata* md = r->metadata_value(); 1523 if (md != _method) f(md); 1524 } 1525 } else if (iter.type() == relocInfo::virtual_call_type) { 1526 // Check compiledIC holders associated with this nmethod 1527 ResourceMark rm; 1528 CompiledIC *ic = CompiledIC_at(&iter); 1529 if (ic->is_icholder_call()) { 1530 CompiledICHolder* cichk = ic->cached_icholder(); 1531 f(cichk->holder_metadata()); 1532 f(cichk->holder_klass()); 1533 } else { 1534 Metadata* ic_oop = ic->cached_metadata(); 1535 if (ic_oop != NULL) { 1536 f(ic_oop); 1537 } 1538 } 1539 } 1540 } 1541 } 1542 1543 // Visit the metadata section 1544 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) { 1545 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops 1546 Metadata* md = *p; 1547 f(md); 1548 } 1549 1550 // Visit metadata not embedded in the other places. 1551 if (_method != NULL) f(_method); 1552 } 1553 1554 // The _is_unloading_state encodes a tuple comprising the unloading cycle 1555 // and the result of IsUnloadingBehaviour::is_unloading() fpr that cycle. 1556 // This is the bit layout of the _is_unloading_state byte: 00000CCU 1557 // CC refers to the cycle, which has 2 bits, and U refers to the result of 1558 // IsUnloadingBehaviour::is_unloading() for that unloading cycle. 1559 1560 class IsUnloadingState: public AllStatic { 1561 static const uint8_t _is_unloading_mask = 1; 1562 static const uint8_t _is_unloading_shift = 0; 1563 static const uint8_t _unloading_cycle_mask = 6; 1564 static const uint8_t _unloading_cycle_shift = 1; 1565 1566 static uint8_t set_is_unloading(uint8_t state, bool value) { 1567 state &= ~_is_unloading_mask; 1568 if (value) { 1569 state |= 1 << _is_unloading_shift; 1570 } 1571 assert(is_unloading(state) == value, "unexpected unloading cycle overflow"); 1572 return state; 1573 } 1574 1575 static uint8_t set_unloading_cycle(uint8_t state, uint8_t value) { 1576 state &= ~_unloading_cycle_mask; 1577 state |= value << _unloading_cycle_shift; 1578 assert(unloading_cycle(state) == value, "unexpected unloading cycle overflow"); 1579 return state; 1580 } 1581 1582 public: 1583 static bool is_unloading(uint8_t state) { return (state & _is_unloading_mask) >> _is_unloading_shift == 1; } 1584 static uint8_t unloading_cycle(uint8_t state) { return (state & _unloading_cycle_mask) >> _unloading_cycle_shift; } 1585 1586 static uint8_t create(bool is_unloading, uint8_t unloading_cycle) { 1587 uint8_t state = 0; 1588 state = set_is_unloading(state, is_unloading); 1589 state = set_unloading_cycle(state, unloading_cycle); 1590 return state; 1591 } 1592 }; 1593 1594 bool nmethod::is_unloading() { 1595 uint8_t state = RawAccess<MO_RELAXED>::load(&_is_unloading_state); 1596 bool state_is_unloading = IsUnloadingState::is_unloading(state); 1597 uint8_t state_unloading_cycle = IsUnloadingState::unloading_cycle(state); 1598 if (state_is_unloading) { 1599 return true; 1600 } 1601 uint8_t current_cycle = CodeCache::unloading_cycle(); 1602 if (state_unloading_cycle == current_cycle) { 1603 return false; 1604 } 1605 1606 // The IsUnloadingBehaviour is responsible for checking if there are any dead 1607 // oops in the CompiledMethod, by calling oops_do on it. 1608 state_unloading_cycle = current_cycle; 1609 1610 if (is_zombie()) { 1611 // Zombies without calculated unloading epoch are never unloading due to GC. 1612 1613 // There are no races where a previously observed is_unloading() nmethod 1614 // suddenly becomes not is_unloading() due to here being observed as zombie. 1615 1616 // With STW unloading, all is_alive() && is_unloading() nmethods are unlinked 1617 // and unloaded in the safepoint. That makes races where an nmethod is first 1618 // observed as is_alive() && is_unloading() and subsequently observed as 1619 // is_zombie() impossible. 1620 1621 // With concurrent unloading, all references to is_unloading() nmethods are 1622 // first unlinked (e.g. IC caches and dependency contexts). Then a global 1623 // handshake operation is performed with all JavaThreads before finally 1624 // unloading the nmethods. The sweeper never converts is_alive() && is_unloading() 1625 // nmethods to zombies; it waits for them to become is_unloaded(). So before 1626 // the global handshake, it is impossible for is_unloading() nmethods to 1627 // racingly become is_zombie(). And is_unloading() is calculated for all is_alive() 1628 // nmethods before taking that global handshake, meaning that it will never 1629 // be recalculated after the handshake. 1630 1631 // After that global handshake, is_unloading() nmethods are only observable 1632 // to the iterators, and they will never trigger recomputation of the cached 1633 // is_unloading_state, and hence may not suffer from such races. 1634 1635 state_is_unloading = false; 1636 } else { 1637 state_is_unloading = IsUnloadingBehaviour::current()->is_unloading(this); 1638 } 1639 1640 state = IsUnloadingState::create(state_is_unloading, state_unloading_cycle); 1641 1642 RawAccess<MO_RELAXED>::store(&_is_unloading_state, state); 1643 1644 return state_is_unloading; 1645 } 1646 1647 void nmethod::clear_unloading_state() { 1648 uint8_t state = IsUnloadingState::create(false, CodeCache::unloading_cycle()); 1649 RawAccess<MO_RELAXED>::store(&_is_unloading_state, state); 1650 } 1651 1652 1653 // This is called at the end of the strong tracing/marking phase of a 1654 // GC to unload an nmethod if it contains otherwise unreachable 1655 // oops. 1656 1657 void nmethod::do_unloading(bool unloading_occurred) { 1658 // Make sure the oop's ready to receive visitors 1659 assert(!is_zombie() && !is_unloaded(), 1660 "should not call follow on zombie or unloaded nmethod"); 1661 1662 if (is_unloading()) { 1663 make_unloaded(); 1664 } else { 1665 #if INCLUDE_JVMCI 1666 if (_jvmci_installed_code != NULL) { 1667 if (JNIHandles::is_global_weak_cleared(_jvmci_installed_code)) { 1668 if (_jvmci_installed_code_triggers_invalidation) { 1669 make_not_entrant(); 1670 } 1671 clear_jvmci_installed_code(); 1672 } 1673 } 1674 #endif 1675 1676 guarantee(unload_nmethod_caches(unloading_occurred), 1677 "Should not need transition stubs"); 1678 } 1679 } 1680 1681 void nmethod::oops_do(OopClosure* f, bool allow_zombie) { 1682 // make sure the oops ready to receive visitors 1683 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod"); 1684 assert(!is_unloaded(), "should not call follow on unloaded nmethod"); 1685 1686 // Prevent extra code cache walk for platforms that don't have immediate oops. 1687 if (relocInfo::mustIterateImmediateOopsInCode()) { 1688 RelocIterator iter(this, oops_reloc_begin()); 1689 1690 while (iter.next()) { 1691 if (iter.type() == relocInfo::oop_type ) { 1692 oop_Relocation* r = iter.oop_reloc(); 1693 // In this loop, we must only follow those oops directly embedded in 1694 // the code. Other oops (oop_index>0) are seen as part of scopes_oops. 1695 assert(1 == (r->oop_is_immediate()) + 1696 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 1697 "oop must be found in exactly one place"); 1698 if (r->oop_is_immediate() && r->oop_value() != NULL) { 1699 f->do_oop(r->oop_addr()); 1700 } 1701 } 1702 } 1703 } 1704 1705 // Scopes 1706 // This includes oop constants not inlined in the code stream. 1707 for (oop* p = oops_begin(); p < oops_end(); p++) { 1708 if (*p == Universe::non_oop_word()) continue; // skip non-oops 1709 f->do_oop(p); 1710 } 1711 } 1712 1713 #define NMETHOD_SENTINEL ((nmethod*)badAddress) 1714 1715 nmethod* volatile nmethod::_oops_do_mark_nmethods; 1716 1717 // An nmethod is "marked" if its _mark_link is set non-null. 1718 // Even if it is the end of the linked list, it will have a non-null link value, 1719 // as long as it is on the list. 1720 // This code must be MP safe, because it is used from parallel GC passes. 1721 bool nmethod::test_set_oops_do_mark() { 1722 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called"); 1723 if (_oops_do_mark_link == NULL) { 1724 // Claim this nmethod for this thread to mark. 1725 if (Atomic::replace_if_null(NMETHOD_SENTINEL, &_oops_do_mark_link)) { 1726 // Atomically append this nmethod (now claimed) to the head of the list: 1727 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods; 1728 for (;;) { 1729 nmethod* required_mark_nmethods = observed_mark_nmethods; 1730 _oops_do_mark_link = required_mark_nmethods; 1731 observed_mark_nmethods = 1732 Atomic::cmpxchg(this, &_oops_do_mark_nmethods, required_mark_nmethods); 1733 if (observed_mark_nmethods == required_mark_nmethods) 1734 break; 1735 } 1736 // Mark was clear when we first saw this guy. 1737 LogTarget(Trace, gc, nmethod) lt; 1738 if (lt.is_enabled()) { 1739 LogStream ls(lt); 1740 CompileTask::print(&ls, this, "oops_do, mark", /*short_form:*/ true); 1741 } 1742 return false; 1743 } 1744 } 1745 // On fall through, another racing thread marked this nmethod before we did. 1746 return true; 1747 } 1748 1749 void nmethod::oops_do_marking_prologue() { 1750 log_trace(gc, nmethod)("oops_do_marking_prologue"); 1751 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row"); 1752 // We use cmpxchg instead of regular assignment here because the user 1753 // may fork a bunch of threads, and we need them all to see the same state. 1754 nmethod* observed = Atomic::cmpxchg(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, (nmethod*)NULL); 1755 guarantee(observed == NULL, "no races in this sequential code"); 1756 } 1757 1758 void nmethod::oops_do_marking_epilogue() { 1759 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row"); 1760 nmethod* cur = _oops_do_mark_nmethods; 1761 while (cur != NMETHOD_SENTINEL) { 1762 assert(cur != NULL, "not NULL-terminated"); 1763 nmethod* next = cur->_oops_do_mark_link; 1764 cur->_oops_do_mark_link = NULL; 1765 DEBUG_ONLY(cur->verify_oop_relocations()); 1766 1767 LogTarget(Trace, gc, nmethod) lt; 1768 if (lt.is_enabled()) { 1769 LogStream ls(lt); 1770 CompileTask::print(&ls, cur, "oops_do, unmark", /*short_form:*/ true); 1771 } 1772 cur = next; 1773 } 1774 nmethod* required = _oops_do_mark_nmethods; 1775 nmethod* observed = Atomic::cmpxchg((nmethod*)NULL, &_oops_do_mark_nmethods, required); 1776 guarantee(observed == required, "no races in this sequential code"); 1777 log_trace(gc, nmethod)("oops_do_marking_epilogue"); 1778 } 1779 1780 class DetectScavengeRoot: public OopClosure { 1781 bool _detected_scavenge_root; 1782 nmethod* _print_nm; 1783 public: 1784 DetectScavengeRoot(nmethod* nm) : _detected_scavenge_root(false), _print_nm(nm) {} 1785 1786 bool detected_scavenge_root() { return _detected_scavenge_root; } 1787 virtual void do_oop(oop* p) { 1788 if ((*p) != NULL && Universe::heap()->is_scavengable(*p)) { 1789 NOT_PRODUCT(maybe_print(p)); 1790 _detected_scavenge_root = true; 1791 } 1792 } 1793 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 1794 1795 #ifndef PRODUCT 1796 void maybe_print(oop* p) { 1797 LogTarget(Trace, gc, nmethod) lt; 1798 if (lt.is_enabled()) { 1799 LogStream ls(lt); 1800 if (!_detected_scavenge_root) { 1801 CompileTask::print(&ls, _print_nm, "new scavenge root", /*short_form:*/ true); 1802 } 1803 ls.print("" PTR_FORMAT "[offset=%d] detected scavengable oop " PTR_FORMAT " (found at " PTR_FORMAT ") ", 1804 p2i(_print_nm), (int)((intptr_t)p - (intptr_t)_print_nm), 1805 p2i(*p), p2i(p)); 1806 ls.cr(); 1807 } 1808 } 1809 #endif //PRODUCT 1810 }; 1811 1812 bool nmethod::detect_scavenge_root_oops() { 1813 DetectScavengeRoot detect_scavenge_root(this); 1814 oops_do(&detect_scavenge_root); 1815 return detect_scavenge_root.detected_scavenge_root(); 1816 } 1817 1818 inline bool includes(void* p, void* from, void* to) { 1819 return from <= p && p < to; 1820 } 1821 1822 1823 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) { 1824 assert(count >= 2, "must be sentinel values, at least"); 1825 1826 #ifdef ASSERT 1827 // must be sorted and unique; we do a binary search in find_pc_desc() 1828 int prev_offset = pcs[0].pc_offset(); 1829 assert(prev_offset == PcDesc::lower_offset_limit, 1830 "must start with a sentinel"); 1831 for (int i = 1; i < count; i++) { 1832 int this_offset = pcs[i].pc_offset(); 1833 assert(this_offset > prev_offset, "offsets must be sorted"); 1834 prev_offset = this_offset; 1835 } 1836 assert(prev_offset == PcDesc::upper_offset_limit, 1837 "must end with a sentinel"); 1838 #endif //ASSERT 1839 1840 // Search for MethodHandle invokes and tag the nmethod. 1841 for (int i = 0; i < count; i++) { 1842 if (pcs[i].is_method_handle_invoke()) { 1843 set_has_method_handle_invokes(true); 1844 break; 1845 } 1846 } 1847 assert(has_method_handle_invokes() == (_deopt_mh_handler_begin != NULL), "must have deopt mh handler"); 1848 1849 int size = count * sizeof(PcDesc); 1850 assert(scopes_pcs_size() >= size, "oob"); 1851 memcpy(scopes_pcs_begin(), pcs, size); 1852 1853 // Adjust the final sentinel downward. 1854 PcDesc* last_pc = &scopes_pcs_begin()[count-1]; 1855 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity"); 1856 last_pc->set_pc_offset(content_size() + 1); 1857 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) { 1858 // Fill any rounding gaps with copies of the last record. 1859 last_pc[1] = last_pc[0]; 1860 } 1861 // The following assert could fail if sizeof(PcDesc) is not 1862 // an integral multiple of oopSize (the rounding term). 1863 // If it fails, change the logic to always allocate a multiple 1864 // of sizeof(PcDesc), and fill unused words with copies of *last_pc. 1865 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly"); 1866 } 1867 1868 void nmethod::copy_scopes_data(u_char* buffer, int size) { 1869 assert(scopes_data_size() >= size, "oob"); 1870 memcpy(scopes_data_begin(), buffer, size); 1871 } 1872 1873 #ifdef ASSERT 1874 static PcDesc* linear_search(const PcDescSearch& search, int pc_offset, bool approximate) { 1875 PcDesc* lower = search.scopes_pcs_begin(); 1876 PcDesc* upper = search.scopes_pcs_end(); 1877 lower += 1; // exclude initial sentinel 1878 PcDesc* res = NULL; 1879 for (PcDesc* p = lower; p < upper; p++) { 1880 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc 1881 if (match_desc(p, pc_offset, approximate)) { 1882 if (res == NULL) 1883 res = p; 1884 else 1885 res = (PcDesc*) badAddress; 1886 } 1887 } 1888 return res; 1889 } 1890 #endif 1891 1892 1893 // Finds a PcDesc with real-pc equal to "pc" 1894 PcDesc* PcDescContainer::find_pc_desc_internal(address pc, bool approximate, const PcDescSearch& search) { 1895 address base_address = search.code_begin(); 1896 if ((pc < base_address) || 1897 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) { 1898 return NULL; // PC is wildly out of range 1899 } 1900 int pc_offset = (int) (pc - base_address); 1901 1902 // Check the PcDesc cache if it contains the desired PcDesc 1903 // (This as an almost 100% hit rate.) 1904 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate); 1905 if (res != NULL) { 1906 assert(res == linear_search(search, pc_offset, approximate), "cache ok"); 1907 return res; 1908 } 1909 1910 // Fallback algorithm: quasi-linear search for the PcDesc 1911 // Find the last pc_offset less than the given offset. 1912 // The successor must be the required match, if there is a match at all. 1913 // (Use a fixed radix to avoid expensive affine pointer arithmetic.) 1914 PcDesc* lower = search.scopes_pcs_begin(); 1915 PcDesc* upper = search.scopes_pcs_end(); 1916 upper -= 1; // exclude final sentinel 1917 if (lower >= upper) return NULL; // native method; no PcDescs at all 1918 1919 #define assert_LU_OK \ 1920 /* invariant on lower..upper during the following search: */ \ 1921 assert(lower->pc_offset() < pc_offset, "sanity"); \ 1922 assert(upper->pc_offset() >= pc_offset, "sanity") 1923 assert_LU_OK; 1924 1925 // Use the last successful return as a split point. 1926 PcDesc* mid = _pc_desc_cache.last_pc_desc(); 1927 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 1928 if (mid->pc_offset() < pc_offset) { 1929 lower = mid; 1930 } else { 1931 upper = mid; 1932 } 1933 1934 // Take giant steps at first (4096, then 256, then 16, then 1) 1935 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1); 1936 const int RADIX = (1 << LOG2_RADIX); 1937 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) { 1938 while ((mid = lower + step) < upper) { 1939 assert_LU_OK; 1940 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 1941 if (mid->pc_offset() < pc_offset) { 1942 lower = mid; 1943 } else { 1944 upper = mid; 1945 break; 1946 } 1947 } 1948 assert_LU_OK; 1949 } 1950 1951 // Sneak up on the value with a linear search of length ~16. 1952 while (true) { 1953 assert_LU_OK; 1954 mid = lower + 1; 1955 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 1956 if (mid->pc_offset() < pc_offset) { 1957 lower = mid; 1958 } else { 1959 upper = mid; 1960 break; 1961 } 1962 } 1963 #undef assert_LU_OK 1964 1965 if (match_desc(upper, pc_offset, approximate)) { 1966 assert(upper == linear_search(search, pc_offset, approximate), "search ok"); 1967 _pc_desc_cache.add_pc_desc(upper); 1968 return upper; 1969 } else { 1970 assert(NULL == linear_search(search, pc_offset, approximate), "search ok"); 1971 return NULL; 1972 } 1973 } 1974 1975 1976 void nmethod::check_all_dependencies(DepChange& changes) { 1977 // Checked dependencies are allocated into this ResourceMark 1978 ResourceMark rm; 1979 1980 // Turn off dependency tracing while actually testing dependencies. 1981 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) ); 1982 1983 typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash, 1984 &DependencySignature::equals, 11027> DepTable; 1985 1986 DepTable* table = new DepTable(); 1987 1988 // Iterate over live nmethods and check dependencies of all nmethods that are not 1989 // marked for deoptimization. A particular dependency is only checked once. 1990 NMethodIterator iter(NMethodIterator::only_alive_and_not_unloading); 1991 while(iter.next()) { 1992 nmethod* nm = iter.method(); 1993 // Only notify for live nmethods 1994 if (!nm->is_marked_for_deoptimization()) { 1995 for (Dependencies::DepStream deps(nm); deps.next(); ) { 1996 // Construct abstraction of a dependency. 1997 DependencySignature* current_sig = new DependencySignature(deps); 1998 1999 // Determine if dependency is already checked. table->put(...) returns 2000 // 'true' if the dependency is added (i.e., was not in the hashtable). 2001 if (table->put(*current_sig, 1)) { 2002 if (deps.check_dependency() != NULL) { 2003 // Dependency checking failed. Print out information about the failed 2004 // dependency and finally fail with an assert. We can fail here, since 2005 // dependency checking is never done in a product build. 2006 tty->print_cr("Failed dependency:"); 2007 changes.print(); 2008 nm->print(); 2009 nm->print_dependencies(); 2010 assert(false, "Should have been marked for deoptimization"); 2011 } 2012 } 2013 } 2014 } 2015 } 2016 } 2017 2018 bool nmethod::check_dependency_on(DepChange& changes) { 2019 // What has happened: 2020 // 1) a new class dependee has been added 2021 // 2) dependee and all its super classes have been marked 2022 bool found_check = false; // set true if we are upset 2023 for (Dependencies::DepStream deps(this); deps.next(); ) { 2024 // Evaluate only relevant dependencies. 2025 if (deps.spot_check_dependency_at(changes) != NULL) { 2026 found_check = true; 2027 NOT_DEBUG(break); 2028 } 2029 } 2030 return found_check; 2031 } 2032 2033 bool nmethod::is_evol_dependent() { 2034 for (Dependencies::DepStream deps(this); deps.next(); ) { 2035 if (deps.type() == Dependencies::evol_method) { 2036 Method* method = deps.method_argument(0); 2037 if (method->is_old()) { 2038 if (log_is_enabled(Debug, redefine, class, nmethod)) { 2039 ResourceMark rm; 2040 log_debug(redefine, class, nmethod) 2041 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)", 2042 _method->method_holder()->external_name(), 2043 _method->name()->as_C_string(), 2044 _method->signature()->as_C_string(), 2045 compile_id(), 2046 method->method_holder()->external_name(), 2047 method->name()->as_C_string(), 2048 method->signature()->as_C_string()); 2049 } 2050 if (TraceDependencies || LogCompilation) 2051 deps.log_dependency(method->method_holder()); 2052 return true; 2053 } 2054 } 2055 } 2056 return false; 2057 } 2058 2059 // Called from mark_for_deoptimization, when dependee is invalidated. 2060 bool nmethod::is_dependent_on_method(Method* dependee) { 2061 for (Dependencies::DepStream deps(this); deps.next(); ) { 2062 if (deps.type() != Dependencies::evol_method) 2063 continue; 2064 Method* method = deps.method_argument(0); 2065 if (method == dependee) return true; 2066 } 2067 return false; 2068 } 2069 2070 2071 bool nmethod::is_patchable_at(address instr_addr) { 2072 assert(insts_contains(instr_addr), "wrong nmethod used"); 2073 if (is_zombie()) { 2074 // a zombie may never be patched 2075 return false; 2076 } 2077 return true; 2078 } 2079 2080 2081 address nmethod::continuation_for_implicit_exception(address pc) { 2082 // Exception happened outside inline-cache check code => we are inside 2083 // an active nmethod => use cpc to determine a return address 2084 int exception_offset = pc - code_begin(); 2085 int cont_offset = ImplicitExceptionTable(this).at( exception_offset ); 2086 #ifdef ASSERT 2087 if (cont_offset == 0) { 2088 Thread* thread = Thread::current(); 2089 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY 2090 HandleMark hm(thread); 2091 ResourceMark rm(thread); 2092 CodeBlob* cb = CodeCache::find_blob(pc); 2093 assert(cb != NULL && cb == this, ""); 2094 ttyLocker ttyl; 2095 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, p2i(pc)); 2096 print(); 2097 method()->print_codes(); 2098 print_code(); 2099 print_pcs(); 2100 } 2101 #endif 2102 if (cont_offset == 0) { 2103 // Let the normal error handling report the exception 2104 return NULL; 2105 } 2106 return code_begin() + cont_offset; 2107 } 2108 2109 2110 2111 void nmethod_init() { 2112 // make sure you didn't forget to adjust the filler fields 2113 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word"); 2114 } 2115 2116 2117 //------------------------------------------------------------------------------------------- 2118 2119 2120 // QQQ might we make this work from a frame?? 2121 nmethodLocker::nmethodLocker(address pc) { 2122 CodeBlob* cb = CodeCache::find_blob(pc); 2123 guarantee(cb != NULL && cb->is_compiled(), "bad pc for a nmethod found"); 2124 _nm = cb->as_compiled_method(); 2125 lock_nmethod(_nm); 2126 } 2127 2128 // Only JvmtiDeferredEvent::compiled_method_unload_event() 2129 // should pass zombie_ok == true. 2130 void nmethodLocker::lock_nmethod(CompiledMethod* cm, bool zombie_ok) { 2131 if (cm == NULL) return; 2132 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method 2133 nmethod* nm = cm->as_nmethod(); 2134 Atomic::inc(&nm->_lock_count); 2135 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method"); 2136 } 2137 2138 void nmethodLocker::unlock_nmethod(CompiledMethod* cm) { 2139 if (cm == NULL) return; 2140 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method 2141 nmethod* nm = cm->as_nmethod(); 2142 Atomic::dec(&nm->_lock_count); 2143 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock"); 2144 } 2145 2146 2147 // ----------------------------------------------------------------------------- 2148 // Verification 2149 2150 class VerifyOopsClosure: public OopClosure { 2151 nmethod* _nm; 2152 bool _ok; 2153 public: 2154 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { } 2155 bool ok() { return _ok; } 2156 virtual void do_oop(oop* p) { 2157 if (oopDesc::is_oop_or_null(*p)) return; 2158 if (_ok) { 2159 _nm->print_nmethod(true); 2160 _ok = false; 2161 } 2162 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)", 2163 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm)); 2164 } 2165 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2166 }; 2167 2168 void nmethod::verify() { 2169 2170 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant 2171 // seems odd. 2172 2173 if (is_zombie() || is_not_entrant() || is_unloaded()) 2174 return; 2175 2176 // Make sure all the entry points are correctly aligned for patching. 2177 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point()); 2178 2179 // assert(oopDesc::is_oop(method()), "must be valid"); 2180 2181 ResourceMark rm; 2182 2183 if (!CodeCache::contains(this)) { 2184 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this)); 2185 } 2186 2187 if(is_native_method() ) 2188 return; 2189 2190 nmethod* nm = CodeCache::find_nmethod(verified_entry_point()); 2191 if (nm != this) { 2192 fatal("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this)); 2193 } 2194 2195 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2196 if (! p->verify(this)) { 2197 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this)); 2198 } 2199 } 2200 2201 VerifyOopsClosure voc(this); 2202 oops_do(&voc); 2203 assert(voc.ok(), "embedded oops must be OK"); 2204 Universe::heap()->verify_nmethod(this); 2205 2206 verify_scopes(); 2207 } 2208 2209 2210 void nmethod::verify_interrupt_point(address call_site) { 2211 // Verify IC only when nmethod installation is finished. 2212 if (!is_not_installed()) { 2213 if (CompiledICLocker::is_safe(this)) { 2214 CompiledIC_at(this, call_site); 2215 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); 2216 } else { 2217 CompiledICLocker ml_verify(this); 2218 CompiledIC_at(this, call_site); 2219 } 2220 } 2221 2222 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address()); 2223 assert(pd != NULL, "PcDesc must exist"); 2224 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(), 2225 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(), 2226 pd->return_oop()); 2227 !sd->is_top(); sd = sd->sender()) { 2228 sd->verify(); 2229 } 2230 } 2231 2232 void nmethod::verify_scopes() { 2233 if( !method() ) return; // Runtime stubs have no scope 2234 if (method()->is_native()) return; // Ignore stub methods. 2235 // iterate through all interrupt point 2236 // and verify the debug information is valid. 2237 RelocIterator iter((nmethod*)this); 2238 while (iter.next()) { 2239 address stub = NULL; 2240 switch (iter.type()) { 2241 case relocInfo::virtual_call_type: 2242 verify_interrupt_point(iter.addr()); 2243 break; 2244 case relocInfo::opt_virtual_call_type: 2245 stub = iter.opt_virtual_call_reloc()->static_stub(false); 2246 verify_interrupt_point(iter.addr()); 2247 break; 2248 case relocInfo::static_call_type: 2249 stub = iter.static_call_reloc()->static_stub(false); 2250 //verify_interrupt_point(iter.addr()); 2251 break; 2252 case relocInfo::runtime_call_type: 2253 case relocInfo::runtime_call_w_cp_type: { 2254 address destination = iter.reloc()->value(); 2255 // Right now there is no way to find out which entries support 2256 // an interrupt point. It would be nice if we had this 2257 // information in a table. 2258 break; 2259 } 2260 default: 2261 break; 2262 } 2263 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section"); 2264 } 2265 } 2266 2267 2268 // ----------------------------------------------------------------------------- 2269 // Non-product code 2270 #ifndef PRODUCT 2271 2272 class DebugScavengeRoot: public OopClosure { 2273 nmethod* _nm; 2274 bool _ok; 2275 public: 2276 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { } 2277 bool ok() { return _ok; } 2278 virtual void do_oop(oop* p) { 2279 if ((*p) == NULL || !Universe::heap()->is_scavengable(*p)) return; 2280 if (_ok) { 2281 _nm->print_nmethod(true); 2282 _ok = false; 2283 } 2284 tty->print_cr("*** scavengable oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)", 2285 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm)); 2286 (*p)->print(); 2287 } 2288 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2289 }; 2290 2291 void nmethod::verify_scavenge_root_oops() { 2292 if (!on_scavenge_root_list()) { 2293 // Actually look inside, to verify the claim that it's clean. 2294 DebugScavengeRoot debug_scavenge_root(this); 2295 oops_do(&debug_scavenge_root); 2296 if (!debug_scavenge_root.ok()) 2297 fatal("found an unadvertised bad scavengable oop in the code cache"); 2298 } 2299 assert(scavenge_root_not_marked(), ""); 2300 } 2301 2302 #endif // PRODUCT 2303 2304 // Printing operations 2305 2306 void nmethod::print() const { 2307 ResourceMark rm; 2308 ttyLocker ttyl; // keep the following output all in one block 2309 2310 tty->print("Compiled method "); 2311 2312 if (is_compiled_by_c1()) { 2313 tty->print("(c1) "); 2314 } else if (is_compiled_by_c2()) { 2315 tty->print("(c2) "); 2316 } else if (is_compiled_by_jvmci()) { 2317 tty->print("(JVMCI) "); 2318 } else { 2319 tty->print("(nm) "); 2320 } 2321 2322 print_on(tty, NULL); 2323 2324 if (WizardMode) { 2325 tty->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this)); 2326 tty->print(" for method " INTPTR_FORMAT , p2i(method())); 2327 tty->print(" { "); 2328 tty->print_cr("%s ", state()); 2329 if (on_scavenge_root_list()) tty->print("scavenge_root "); 2330 tty->print_cr("}:"); 2331 } 2332 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2333 p2i(this), 2334 p2i(this) + size(), 2335 size()); 2336 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2337 p2i(relocation_begin()), 2338 p2i(relocation_end()), 2339 relocation_size()); 2340 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2341 p2i(consts_begin()), 2342 p2i(consts_end()), 2343 consts_size()); 2344 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2345 p2i(insts_begin()), 2346 p2i(insts_end()), 2347 insts_size()); 2348 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2349 p2i(stub_begin()), 2350 p2i(stub_end()), 2351 stub_size()); 2352 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2353 p2i(oops_begin()), 2354 p2i(oops_end()), 2355 oops_size()); 2356 if (metadata_size () > 0) tty->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2357 p2i(metadata_begin()), 2358 p2i(metadata_end()), 2359 metadata_size()); 2360 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2361 p2i(scopes_data_begin()), 2362 p2i(scopes_data_end()), 2363 scopes_data_size()); 2364 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2365 p2i(scopes_pcs_begin()), 2366 p2i(scopes_pcs_end()), 2367 scopes_pcs_size()); 2368 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2369 p2i(dependencies_begin()), 2370 p2i(dependencies_end()), 2371 dependencies_size()); 2372 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2373 p2i(handler_table_begin()), 2374 p2i(handler_table_end()), 2375 handler_table_size()); 2376 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2377 p2i(nul_chk_table_begin()), 2378 p2i(nul_chk_table_end()), 2379 nul_chk_table_size()); 2380 } 2381 2382 #ifndef PRODUCT 2383 2384 void nmethod::print_scopes() { 2385 // Find the first pc desc for all scopes in the code and print it. 2386 ResourceMark rm; 2387 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2388 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null) 2389 continue; 2390 2391 ScopeDesc* sd = scope_desc_at(p->real_pc(this)); 2392 while (sd != NULL) { 2393 sd->print_on(tty, p); 2394 sd = sd->sender(); 2395 } 2396 } 2397 } 2398 2399 void nmethod::print_dependencies() { 2400 ResourceMark rm; 2401 ttyLocker ttyl; // keep the following output all in one block 2402 tty->print_cr("Dependencies:"); 2403 for (Dependencies::DepStream deps(this); deps.next(); ) { 2404 deps.print_dependency(); 2405 Klass* ctxk = deps.context_type(); 2406 if (ctxk != NULL) { 2407 if (ctxk->is_instance_klass() && InstanceKlass::cast(ctxk)->is_dependent_nmethod(this)) { 2408 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name()); 2409 } 2410 } 2411 deps.log_dependency(); // put it into the xml log also 2412 } 2413 } 2414 2415 2416 void nmethod::print_relocations() { 2417 ResourceMark m; // in case methods get printed via the debugger 2418 tty->print_cr("relocations:"); 2419 RelocIterator iter(this); 2420 iter.print(); 2421 } 2422 2423 2424 void nmethod::print_pcs() { 2425 ResourceMark m; // in case methods get printed via debugger 2426 tty->print_cr("pc-bytecode offsets:"); 2427 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2428 p->print(this); 2429 } 2430 } 2431 2432 void nmethod::print_recorded_oops() { 2433 tty->print_cr("Recorded oops:"); 2434 for (int i = 0; i < oops_count(); i++) { 2435 oop o = oop_at(i); 2436 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(o)); 2437 if (o == Universe::non_oop_word()) { 2438 tty->print("non-oop word"); 2439 } else { 2440 if (o != NULL) { 2441 o->print_value(); 2442 } else { 2443 tty->print_cr("NULL"); 2444 } 2445 } 2446 tty->cr(); 2447 } 2448 } 2449 2450 void nmethod::print_recorded_metadata() { 2451 tty->print_cr("Recorded metadata:"); 2452 for (int i = 0; i < metadata_count(); i++) { 2453 Metadata* m = metadata_at(i); 2454 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(m)); 2455 if (m == (Metadata*)Universe::non_oop_word()) { 2456 tty->print("non-metadata word"); 2457 } else { 2458 Metadata::print_value_on_maybe_null(tty, m); 2459 } 2460 tty->cr(); 2461 } 2462 } 2463 2464 #endif // PRODUCT 2465 2466 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) { 2467 RelocIterator iter(this, begin, end); 2468 bool have_one = false; 2469 while (iter.next()) { 2470 have_one = true; 2471 switch (iter.type()) { 2472 case relocInfo::none: return "no_reloc"; 2473 case relocInfo::oop_type: { 2474 stringStream st; 2475 oop_Relocation* r = iter.oop_reloc(); 2476 oop obj = r->oop_value(); 2477 st.print("oop("); 2478 if (obj == NULL) st.print("NULL"); 2479 else obj->print_value_on(&st); 2480 st.print(")"); 2481 return st.as_string(); 2482 } 2483 case relocInfo::metadata_type: { 2484 stringStream st; 2485 metadata_Relocation* r = iter.metadata_reloc(); 2486 Metadata* obj = r->metadata_value(); 2487 st.print("metadata("); 2488 if (obj == NULL) st.print("NULL"); 2489 else obj->print_value_on(&st); 2490 st.print(")"); 2491 return st.as_string(); 2492 } 2493 case relocInfo::runtime_call_type: 2494 case relocInfo::runtime_call_w_cp_type: { 2495 stringStream st; 2496 st.print("runtime_call"); 2497 CallRelocation* r = (CallRelocation*)iter.reloc(); 2498 address dest = r->destination(); 2499 CodeBlob* cb = CodeCache::find_blob(dest); 2500 if (cb != NULL) { 2501 st.print(" %s", cb->name()); 2502 } else { 2503 ResourceMark rm; 2504 const int buflen = 1024; 2505 char* buf = NEW_RESOURCE_ARRAY(char, buflen); 2506 int offset; 2507 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) { 2508 st.print(" %s", buf); 2509 if (offset != 0) { 2510 st.print("+%d", offset); 2511 } 2512 } 2513 } 2514 return st.as_string(); 2515 } 2516 case relocInfo::virtual_call_type: { 2517 stringStream st; 2518 st.print_raw("virtual_call"); 2519 virtual_call_Relocation* r = iter.virtual_call_reloc(); 2520 Method* m = r->method_value(); 2521 if (m != NULL) { 2522 assert(m->is_method(), ""); 2523 m->print_short_name(&st); 2524 } 2525 return st.as_string(); 2526 } 2527 case relocInfo::opt_virtual_call_type: { 2528 stringStream st; 2529 st.print_raw("optimized virtual_call"); 2530 opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc(); 2531 Method* m = r->method_value(); 2532 if (m != NULL) { 2533 assert(m->is_method(), ""); 2534 m->print_short_name(&st); 2535 } 2536 return st.as_string(); 2537 } 2538 case relocInfo::static_call_type: { 2539 stringStream st; 2540 st.print_raw("static_call"); 2541 static_call_Relocation* r = iter.static_call_reloc(); 2542 Method* m = r->method_value(); 2543 if (m != NULL) { 2544 assert(m->is_method(), ""); 2545 m->print_short_name(&st); 2546 } 2547 return st.as_string(); 2548 } 2549 case relocInfo::static_stub_type: return "static_stub"; 2550 case relocInfo::external_word_type: return "external_word"; 2551 case relocInfo::internal_word_type: return "internal_word"; 2552 case relocInfo::section_word_type: return "section_word"; 2553 case relocInfo::poll_type: return "poll"; 2554 case relocInfo::poll_return_type: return "poll_return"; 2555 case relocInfo::trampoline_stub_type: return "trampoline_stub"; 2556 case relocInfo::type_mask: return "type_bit_mask"; 2557 2558 default: 2559 break; 2560 } 2561 } 2562 return have_one ? "other" : NULL; 2563 } 2564 2565 // Return a the last scope in (begin..end] 2566 ScopeDesc* nmethod::scope_desc_in(address begin, address end) { 2567 PcDesc* p = pc_desc_near(begin+1); 2568 if (p != NULL && p->real_pc(this) <= end) { 2569 return new ScopeDesc(this, p->scope_decode_offset(), 2570 p->obj_decode_offset(), p->should_reexecute(), p->rethrow_exception(), 2571 p->return_oop()); 2572 } 2573 return NULL; 2574 } 2575 2576 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const { 2577 if (block_begin == entry_point()) stream->print_cr("[Entry Point]"); 2578 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]"); 2579 if (JVMCI_ONLY(_exception_offset >= 0 &&) block_begin == exception_begin()) stream->print_cr("[Exception Handler]"); 2580 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]"); 2581 if (JVMCI_ONLY(_deopt_handler_begin != NULL &&) block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]"); 2582 2583 if (has_method_handle_invokes()) 2584 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]"); 2585 2586 if (block_begin == consts_begin()) stream->print_cr("[Constants]"); 2587 2588 if (block_begin == entry_point()) { 2589 methodHandle m = method(); 2590 if (m.not_null()) { 2591 stream->print(" # "); 2592 m->print_value_on(stream); 2593 stream->cr(); 2594 } 2595 if (m.not_null() && !is_osr_method()) { 2596 ResourceMark rm; 2597 int sizeargs = m->size_of_parameters(); 2598 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs); 2599 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs); 2600 { 2601 int sig_index = 0; 2602 if (!m->is_static()) 2603 sig_bt[sig_index++] = T_OBJECT; // 'this' 2604 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) { 2605 BasicType t = ss.type(); 2606 sig_bt[sig_index++] = t; 2607 if (type2size[t] == 2) { 2608 sig_bt[sig_index++] = T_VOID; 2609 } else { 2610 assert(type2size[t] == 1, "size is 1 or 2"); 2611 } 2612 } 2613 assert(sig_index == sizeargs, ""); 2614 } 2615 const char* spname = "sp"; // make arch-specific? 2616 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false); 2617 int stack_slot_offset = this->frame_size() * wordSize; 2618 int tab1 = 14, tab2 = 24; 2619 int sig_index = 0; 2620 int arg_index = (m->is_static() ? 0 : -1); 2621 bool did_old_sp = false; 2622 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) { 2623 bool at_this = (arg_index == -1); 2624 bool at_old_sp = false; 2625 BasicType t = (at_this ? T_OBJECT : ss.type()); 2626 assert(t == sig_bt[sig_index], "sigs in sync"); 2627 if (at_this) 2628 stream->print(" # this: "); 2629 else 2630 stream->print(" # parm%d: ", arg_index); 2631 stream->move_to(tab1); 2632 VMReg fst = regs[sig_index].first(); 2633 VMReg snd = regs[sig_index].second(); 2634 if (fst->is_reg()) { 2635 stream->print("%s", fst->name()); 2636 if (snd->is_valid()) { 2637 stream->print(":%s", snd->name()); 2638 } 2639 } else if (fst->is_stack()) { 2640 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset; 2641 if (offset == stack_slot_offset) at_old_sp = true; 2642 stream->print("[%s+0x%x]", spname, offset); 2643 } else { 2644 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd); 2645 } 2646 stream->print(" "); 2647 stream->move_to(tab2); 2648 stream->print("= "); 2649 if (at_this) { 2650 m->method_holder()->print_value_on(stream); 2651 } else { 2652 bool did_name = false; 2653 if (!at_this && ss.is_object()) { 2654 Symbol* name = ss.as_symbol_or_null(); 2655 if (name != NULL) { 2656 name->print_value_on(stream); 2657 did_name = true; 2658 } 2659 } 2660 if (!did_name) 2661 stream->print("%s", type2name(t)); 2662 } 2663 if (at_old_sp) { 2664 stream->print(" (%s of caller)", spname); 2665 did_old_sp = true; 2666 } 2667 stream->cr(); 2668 sig_index += type2size[t]; 2669 arg_index += 1; 2670 if (!at_this) ss.next(); 2671 } 2672 if (!did_old_sp) { 2673 stream->print(" # "); 2674 stream->move_to(tab1); 2675 stream->print("[%s+0x%x]", spname, stack_slot_offset); 2676 stream->print(" (%s of caller)", spname); 2677 stream->cr(); 2678 } 2679 } 2680 } 2681 } 2682 2683 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) { 2684 // First, find an oopmap in (begin, end]. 2685 // We use the odd half-closed interval so that oop maps and scope descs 2686 // which are tied to the byte after a call are printed with the call itself. 2687 address base = code_begin(); 2688 ImmutableOopMapSet* oms = oop_maps(); 2689 if (oms != NULL) { 2690 for (int i = 0, imax = oms->count(); i < imax; i++) { 2691 const ImmutableOopMapPair* pair = oms->pair_at(i); 2692 const ImmutableOopMap* om = pair->get_from(oms); 2693 address pc = base + pair->pc_offset(); 2694 if (pc > begin) { 2695 if (pc <= end) { 2696 st->move_to(column); 2697 st->print("; "); 2698 om->print_on(st); 2699 } 2700 break; 2701 } 2702 } 2703 } 2704 2705 // Print any debug info present at this pc. 2706 ScopeDesc* sd = scope_desc_in(begin, end); 2707 if (sd != NULL) { 2708 st->move_to(column); 2709 if (sd->bci() == SynchronizationEntryBCI) { 2710 st->print(";*synchronization entry"); 2711 } else if (sd->bci() == AfterBci) { 2712 st->print(";* method exit (unlocked if synchronized)"); 2713 } else if (sd->bci() == UnwindBci) { 2714 st->print(";* unwind (locked if synchronized)"); 2715 } else if (sd->bci() == AfterExceptionBci) { 2716 st->print(";* unwind (unlocked if synchronized)"); 2717 } else if (sd->bci() == UnknownBci) { 2718 st->print(";* unknown"); 2719 } else if (sd->bci() == InvalidFrameStateBci) { 2720 st->print(";* invalid frame state"); 2721 } else { 2722 if (sd->method() == NULL) { 2723 st->print("method is NULL"); 2724 } else if (sd->method()->is_native()) { 2725 st->print("method is native"); 2726 } else { 2727 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci()); 2728 st->print(";*%s", Bytecodes::name(bc)); 2729 switch (bc) { 2730 case Bytecodes::_invokevirtual: 2731 case Bytecodes::_invokespecial: 2732 case Bytecodes::_invokestatic: 2733 case Bytecodes::_invokeinterface: 2734 { 2735 Bytecode_invoke invoke(sd->method(), sd->bci()); 2736 st->print(" "); 2737 if (invoke.name() != NULL) 2738 invoke.name()->print_symbol_on(st); 2739 else 2740 st->print("<UNKNOWN>"); 2741 break; 2742 } 2743 case Bytecodes::_getfield: 2744 case Bytecodes::_putfield: 2745 case Bytecodes::_getstatic: 2746 case Bytecodes::_putstatic: 2747 { 2748 Bytecode_field field(sd->method(), sd->bci()); 2749 st->print(" "); 2750 if (field.name() != NULL) 2751 field.name()->print_symbol_on(st); 2752 else 2753 st->print("<UNKNOWN>"); 2754 } 2755 default: 2756 break; 2757 } 2758 } 2759 st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop()); 2760 } 2761 2762 // Print all scopes 2763 for (;sd != NULL; sd = sd->sender()) { 2764 st->move_to(column); 2765 st->print("; -"); 2766 if (sd->method() == NULL) { 2767 st->print("method is NULL"); 2768 } else { 2769 sd->method()->print_short_name(st); 2770 } 2771 int lineno = sd->method()->line_number_from_bci(sd->bci()); 2772 if (lineno != -1) { 2773 st->print("@%d (line %d)", sd->bci(), lineno); 2774 } else { 2775 st->print("@%d", sd->bci()); 2776 } 2777 st->cr(); 2778 } 2779 } 2780 2781 // Print relocation information 2782 const char* str = reloc_string_for(begin, end); 2783 if (str != NULL) { 2784 if (sd != NULL) st->cr(); 2785 st->move_to(column); 2786 st->print("; {%s}", str); 2787 } 2788 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin()); 2789 if (cont_offset != 0) { 2790 st->move_to(column); 2791 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset)); 2792 } 2793 2794 } 2795 2796 class DirectNativeCallWrapper: public NativeCallWrapper { 2797 private: 2798 NativeCall* _call; 2799 2800 public: 2801 DirectNativeCallWrapper(NativeCall* call) : _call(call) {} 2802 2803 virtual address destination() const { return _call->destination(); } 2804 virtual address instruction_address() const { return _call->instruction_address(); } 2805 virtual address next_instruction_address() const { return _call->next_instruction_address(); } 2806 virtual address return_address() const { return _call->return_address(); } 2807 2808 virtual address get_resolve_call_stub(bool is_optimized) const { 2809 if (is_optimized) { 2810 return SharedRuntime::get_resolve_opt_virtual_call_stub(); 2811 } 2812 return SharedRuntime::get_resolve_virtual_call_stub(); 2813 } 2814 2815 virtual void set_destination_mt_safe(address dest) { 2816 #if INCLUDE_AOT 2817 if (UseAOT) { 2818 CodeBlob* callee = CodeCache::find_blob(dest); 2819 CompiledMethod* cm = callee->as_compiled_method_or_null(); 2820 if (cm != NULL && cm->is_far_code()) { 2821 // Temporary fix, see JDK-8143106 2822 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address()); 2823 csc->set_to_far(methodHandle(cm->method()), dest); 2824 return; 2825 } 2826 } 2827 #endif 2828 _call->set_destination_mt_safe(dest); 2829 } 2830 2831 virtual void set_to_interpreted(const methodHandle& method, CompiledICInfo& info) { 2832 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address()); 2833 #if INCLUDE_AOT 2834 if (info.to_aot()) { 2835 csc->set_to_far(method, info.entry()); 2836 } else 2837 #endif 2838 { 2839 csc->set_to_interpreted(method, info.entry()); 2840 } 2841 } 2842 2843 virtual void verify() const { 2844 // make sure code pattern is actually a call imm32 instruction 2845 _call->verify(); 2846 _call->verify_alignment(); 2847 } 2848 2849 virtual void verify_resolve_call(address dest) const { 2850 CodeBlob* db = CodeCache::find_blob_unsafe(dest); 2851 assert(db != NULL && !db->is_adapter_blob(), "must use stub!"); 2852 } 2853 2854 virtual bool is_call_to_interpreted(address dest) const { 2855 CodeBlob* cb = CodeCache::find_blob(_call->instruction_address()); 2856 return cb->contains(dest); 2857 } 2858 2859 virtual bool is_safe_for_patching() const { return false; } 2860 2861 virtual NativeInstruction* get_load_instruction(virtual_call_Relocation* r) const { 2862 return nativeMovConstReg_at(r->cached_value()); 2863 } 2864 2865 virtual void *get_data(NativeInstruction* instruction) const { 2866 return (void*)((NativeMovConstReg*) instruction)->data(); 2867 } 2868 2869 virtual void set_data(NativeInstruction* instruction, intptr_t data) { 2870 ((NativeMovConstReg*) instruction)->set_data(data); 2871 } 2872 }; 2873 2874 NativeCallWrapper* nmethod::call_wrapper_at(address call) const { 2875 return new DirectNativeCallWrapper((NativeCall*) call); 2876 } 2877 2878 NativeCallWrapper* nmethod::call_wrapper_before(address return_pc) const { 2879 return new DirectNativeCallWrapper(nativeCall_before(return_pc)); 2880 } 2881 2882 address nmethod::call_instruction_address(address pc) const { 2883 if (NativeCall::is_call_before(pc)) { 2884 NativeCall *ncall = nativeCall_before(pc); 2885 return ncall->instruction_address(); 2886 } 2887 return NULL; 2888 } 2889 2890 CompiledStaticCall* nmethod::compiledStaticCall_at(Relocation* call_site) const { 2891 return CompiledDirectStaticCall::at(call_site); 2892 } 2893 2894 CompiledStaticCall* nmethod::compiledStaticCall_at(address call_site) const { 2895 return CompiledDirectStaticCall::at(call_site); 2896 } 2897 2898 CompiledStaticCall* nmethod::compiledStaticCall_before(address return_addr) const { 2899 return CompiledDirectStaticCall::before(return_addr); 2900 } 2901 2902 #ifndef PRODUCT 2903 2904 void nmethod::print_value_on(outputStream* st) const { 2905 st->print("nmethod"); 2906 print_on(st, NULL); 2907 } 2908 2909 void nmethod::print_calls(outputStream* st) { 2910 RelocIterator iter(this); 2911 while (iter.next()) { 2912 switch (iter.type()) { 2913 case relocInfo::virtual_call_type: 2914 case relocInfo::opt_virtual_call_type: { 2915 CompiledICLocker ml_verify(this); 2916 CompiledIC_at(&iter)->print(); 2917 break; 2918 } 2919 case relocInfo::static_call_type: 2920 st->print_cr("Static call at " INTPTR_FORMAT, p2i(iter.reloc()->addr())); 2921 CompiledDirectStaticCall::at(iter.reloc())->print(); 2922 break; 2923 default: 2924 break; 2925 } 2926 } 2927 } 2928 2929 void nmethod::print_handler_table() { 2930 ExceptionHandlerTable(this).print(); 2931 } 2932 2933 void nmethod::print_nul_chk_table() { 2934 ImplicitExceptionTable(this).print(code_begin()); 2935 } 2936 2937 void nmethod::print_statistics() { 2938 ttyLocker ttyl; 2939 if (xtty != NULL) xtty->head("statistics type='nmethod'"); 2940 native_nmethod_stats.print_native_nmethod_stats(); 2941 #ifdef COMPILER1 2942 c1_java_nmethod_stats.print_nmethod_stats("C1"); 2943 #endif 2944 #ifdef COMPILER2 2945 c2_java_nmethod_stats.print_nmethod_stats("C2"); 2946 #endif 2947 #if INCLUDE_JVMCI 2948 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI"); 2949 #endif 2950 unknown_java_nmethod_stats.print_nmethod_stats("Unknown"); 2951 DebugInformationRecorder::print_statistics(); 2952 #ifndef PRODUCT 2953 pc_nmethod_stats.print_pc_stats(); 2954 #endif 2955 Dependencies::print_statistics(); 2956 if (xtty != NULL) xtty->tail("statistics"); 2957 } 2958 2959 #endif // !PRODUCT 2960 2961 #if INCLUDE_JVMCI 2962 void nmethod::clear_jvmci_installed_code() { 2963 assert_locked_or_safepoint(Patching_lock); 2964 if (_jvmci_installed_code != NULL) { 2965 JNIHandles::destroy_weak_global(_jvmci_installed_code); 2966 _jvmci_installed_code = NULL; 2967 } 2968 } 2969 2970 void nmethod::clear_speculation_log() { 2971 assert_locked_or_safepoint(Patching_lock); 2972 if (_speculation_log != NULL) { 2973 JNIHandles::destroy_weak_global(_speculation_log); 2974 _speculation_log = NULL; 2975 } 2976 } 2977 2978 void nmethod::maybe_invalidate_installed_code() { 2979 if (!is_compiled_by_jvmci()) { 2980 return; 2981 } 2982 2983 assert(Patching_lock->is_locked() || 2984 SafepointSynchronize::is_at_safepoint(), "should be performed under a lock for consistency"); 2985 oop installed_code = JNIHandles::resolve(_jvmci_installed_code); 2986 if (installed_code != NULL) { 2987 // Update the values in the InstalledCode instance if it still refers to this nmethod 2988 nmethod* nm = (nmethod*)InstalledCode::address(installed_code); 2989 if (nm == this) { 2990 if (!is_alive() || is_unloading()) { 2991 // Break the link between nmethod and InstalledCode such that the nmethod 2992 // can subsequently be flushed safely. The link must be maintained while 2993 // the method could have live activations since invalidateInstalledCode 2994 // might want to invalidate all existing activations. 2995 InstalledCode::set_address(installed_code, 0); 2996 InstalledCode::set_entryPoint(installed_code, 0); 2997 } else if (is_not_entrant()) { 2998 // Remove the entry point so any invocation will fail but keep 2999 // the address link around that so that existing activations can 3000 // be invalidated. 3001 InstalledCode::set_entryPoint(installed_code, 0); 3002 } 3003 } 3004 } 3005 if (!is_alive() || is_unloading()) { 3006 // Clear these out after the nmethod has been unregistered and any 3007 // updates to the InstalledCode instance have been performed. 3008 clear_jvmci_installed_code(); 3009 clear_speculation_log(); 3010 } 3011 } 3012 3013 void nmethod::invalidate_installed_code(Handle installedCode, TRAPS) { 3014 if (installedCode() == NULL) { 3015 THROW(vmSymbols::java_lang_NullPointerException()); 3016 } 3017 jlong nativeMethod = InstalledCode::address(installedCode); 3018 nmethod* nm = (nmethod*)nativeMethod; 3019 if (nm == NULL) { 3020 // Nothing to do 3021 return; 3022 } 3023 3024 nmethodLocker nml(nm); 3025 #ifdef ASSERT 3026 { 3027 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 3028 // This relationship can only be checked safely under a lock 3029 assert(!nm->is_alive() || nm->is_unloading() || nm->jvmci_installed_code() == installedCode(), "sanity check"); 3030 } 3031 #endif 3032 3033 if (nm->is_alive()) { 3034 // Invalidating the InstalledCode means we want the nmethod 3035 // to be deoptimized. 3036 nm->mark_for_deoptimization(); 3037 VM_Deoptimize op; 3038 VMThread::execute(&op); 3039 } 3040 3041 // Multiple threads could reach this point so we now need to 3042 // lock and re-check the link to the nmethod so that only one 3043 // thread clears it. 3044 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 3045 if (InstalledCode::address(installedCode) == nativeMethod) { 3046 InstalledCode::set_address(installedCode, 0); 3047 } 3048 } 3049 3050 oop nmethod::jvmci_installed_code() { 3051 return JNIHandles::resolve(_jvmci_installed_code); 3052 } 3053 3054 oop nmethod::speculation_log() { 3055 return JNIHandles::resolve(_speculation_log); 3056 } 3057 3058 char* nmethod::jvmci_installed_code_name(char* buf, size_t buflen) const { 3059 if (!this->is_compiled_by_jvmci()) { 3060 return NULL; 3061 } 3062 oop installed_code = JNIHandles::resolve(_jvmci_installed_code); 3063 if (installed_code != NULL) { 3064 oop installed_code_name = NULL; 3065 if (installed_code->is_a(InstalledCode::klass())) { 3066 installed_code_name = InstalledCode::name(installed_code); 3067 } 3068 if (installed_code_name != NULL) { 3069 return java_lang_String::as_utf8_string(installed_code_name, buf, (int)buflen); 3070 } 3071 } 3072 return NULL; 3073 } 3074 #endif