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