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 } 1110 1111 // Clear the method of this dead nmethod 1112 set_method(NULL); 1113 1114 // Log the unloading. 1115 log_state_change(); 1116 1117 #if INCLUDE_JVMCI 1118 // The method can only be unloaded after the pointer to the installed code 1119 // Java wrapper is no longer alive. Here we need to clear out this weak 1120 // reference to the dead object. 1121 maybe_invalidate_installed_code(); 1122 #endif 1123 1124 // The Method* is gone at this point 1125 assert(_method == NULL, "Tautology"); 1126 1127 set_osr_link(NULL); 1128 NMethodSweeper::report_state_change(this); 1129 1130 // The release is only needed for compile-time ordering, as accesses 1131 // into the nmethod after the store are not safe due to the sweeper 1132 // being allowed to free it when the store is observed, during 1133 // concurrent nmethod unloading. Therefore, there is no need for 1134 // acquire on the loader side. 1135 OrderAccess::release_store(&_state, (signed char)unloaded); 1136 } 1137 1138 void nmethod::invalidate_osr_method() { 1139 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); 1140 // Remove from list of active nmethods 1141 if (method() != NULL) { 1142 method()->method_holder()->remove_osr_nmethod(this); 1143 } 1144 } 1145 1146 void nmethod::log_state_change() const { 1147 if (LogCompilation) { 1148 if (xtty != NULL) { 1149 ttyLocker ttyl; // keep the following output all in one block 1150 if (_state == unloaded) { 1151 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'", 1152 os::current_thread_id()); 1153 } else { 1154 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s", 1155 os::current_thread_id(), 1156 (_state == zombie ? " zombie='1'" : "")); 1157 } 1158 log_identity(xtty); 1159 xtty->stamp(); 1160 xtty->end_elem(); 1161 } 1162 } 1163 1164 const char *state_msg = _state == zombie ? "made zombie" : "made not entrant"; 1165 CompileTask::print_ul(this, state_msg); 1166 if (PrintCompilation && _state != unloaded) { 1167 print_on(tty, state_msg); 1168 } 1169 } 1170 1171 void nmethod::unlink_from_method(bool acquire_lock) { 1172 // We need to check if both the _code and _from_compiled_code_entry_point 1173 // refer to this nmethod because there is a race in setting these two fields 1174 // in Method* as seen in bugid 4947125. 1175 // If the vep() points to the zombie nmethod, the memory for the nmethod 1176 // could be flushed and the compiler and vtable stubs could still call 1177 // through it. 1178 if (method() != NULL && (method()->code() == this || 1179 method()->from_compiled_entry() == verified_entry_point())) { 1180 method()->clear_code(acquire_lock); 1181 } 1182 } 1183 1184 /** 1185 * Common functionality for both make_not_entrant and make_zombie 1186 */ 1187 bool nmethod::make_not_entrant_or_zombie(int state) { 1188 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant"); 1189 assert(!is_zombie(), "should not already be a zombie"); 1190 1191 if (_state == state) { 1192 // Avoid taking the lock if already in required state. 1193 // This is safe from races because the state is an end-state, 1194 // which the nmethod cannot back out of once entered. 1195 // No need for fencing either. 1196 return false; 1197 } 1198 1199 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below. 1200 nmethodLocker nml(this); 1201 methodHandle the_method(method()); 1202 // This can be called while the system is already at a safepoint which is ok 1203 NoSafepointVerifier nsv(true, !SafepointSynchronize::is_at_safepoint()); 1204 1205 // during patching, depending on the nmethod state we must notify the GC that 1206 // code has been unloaded, unregistering it. We cannot do this right while 1207 // holding the Patching_lock because we need to use the CodeCache_lock. This 1208 // would be prone to deadlocks. 1209 // This flag is used to remember whether we need to later lock and unregister. 1210 bool nmethod_needs_unregister = false; 1211 1212 { 1213 // invalidate osr nmethod before acquiring the patching lock since 1214 // they both acquire leaf locks and we don't want a deadlock. 1215 // This logic is equivalent to the logic below for patching the 1216 // verified entry point of regular methods. We check that the 1217 // nmethod is in use to ensure that it is invalidated only once. 1218 if (is_osr_method() && is_in_use()) { 1219 // this effectively makes the osr nmethod not entrant 1220 invalidate_osr_method(); 1221 } 1222 1223 // Enter critical section. Does not block for safepoint. 1224 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 1225 1226 if (_state == state) { 1227 // another thread already performed this transition so nothing 1228 // to do, but return false to indicate this. 1229 return false; 1230 } 1231 1232 // The caller can be calling the method statically or through an inline 1233 // cache call. 1234 if (!is_osr_method() && !is_not_entrant()) { 1235 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(), 1236 SharedRuntime::get_handle_wrong_method_stub()); 1237 } 1238 1239 if (is_in_use() && update_recompile_counts()) { 1240 // It's a true state change, so mark the method as decompiled. 1241 // Do it only for transition from alive. 1242 inc_decompile_count(); 1243 } 1244 1245 // If the state is becoming a zombie, signal to unregister the nmethod with 1246 // the heap. 1247 // This nmethod may have already been unloaded during a full GC. 1248 if ((state == zombie) && !is_unloaded()) { 1249 nmethod_needs_unregister = true; 1250 } 1251 1252 // Must happen before state change. Otherwise we have a race condition in 1253 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately 1254 // transition its state from 'not_entrant' to 'zombie' without having to wait 1255 // for stack scanning. 1256 if (state == not_entrant) { 1257 mark_as_seen_on_stack(); 1258 OrderAccess::storestore(); // _stack_traversal_mark and _state 1259 } 1260 1261 // Change state 1262 _state = state; 1263 1264 // Log the transition once 1265 log_state_change(); 1266 1267 // Invalidate while holding the patching lock 1268 JVMCI_ONLY(maybe_invalidate_installed_code()); 1269 1270 // Remove nmethod from method. 1271 unlink_from_method(false /* already owns Patching_lock */); 1272 } // leave critical region under Patching_lock 1273 1274 #ifdef ASSERT 1275 if (is_osr_method() && method() != NULL) { 1276 // Make sure osr nmethod is invalidated, i.e. not on the list 1277 bool found = method()->method_holder()->remove_osr_nmethod(this); 1278 assert(!found, "osr nmethod should have been invalidated"); 1279 } 1280 #endif 1281 1282 // When the nmethod becomes zombie it is no longer alive so the 1283 // dependencies must be flushed. nmethods in the not_entrant 1284 // state will be flushed later when the transition to zombie 1285 // happens or they get unloaded. 1286 if (state == zombie) { 1287 { 1288 // Flushing dependencies must be done before any possible 1289 // safepoint can sneak in, otherwise the oops used by the 1290 // dependency logic could have become stale. 1291 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1292 if (nmethod_needs_unregister) { 1293 Universe::heap()->unregister_nmethod(this); 1294 } 1295 flush_dependencies(/*delete_immediately*/true); 1296 } 1297 1298 // Clear ICStubs to prevent back patching stubs of zombie or flushed 1299 // nmethods during the next safepoint (see ICStub::finalize), as well 1300 // as to free up CompiledICHolder resources. 1301 { 1302 CompiledICLocker ml(this); 1303 clear_ic_callsites(); 1304 } 1305 1306 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload 1307 // event and it hasn't already been reported for this nmethod then 1308 // report it now. The event may have been reported earlier if the GC 1309 // marked it for unloading). JvmtiDeferredEventQueue support means 1310 // we no longer go to a safepoint here. 1311 post_compiled_method_unload(); 1312 1313 #ifdef ASSERT 1314 // It's no longer safe to access the oops section since zombie 1315 // nmethods aren't scanned for GC. 1316 _oops_are_stale = true; 1317 #endif 1318 // the Method may be reclaimed by class unloading now that the 1319 // nmethod is in zombie state 1320 set_method(NULL); 1321 } else { 1322 assert(state == not_entrant, "other cases may need to be handled differently"); 1323 } 1324 1325 if (TraceCreateZombies) { 1326 ResourceMark m; 1327 tty->print_cr("nmethod <" INTPTR_FORMAT "> %s code made %s", p2i(this), this->method() ? this->method()->name_and_sig_as_C_string() : "null", (state == not_entrant) ? "not entrant" : "zombie"); 1328 } 1329 1330 NMethodSweeper::report_state_change(this); 1331 return true; 1332 } 1333 1334 void nmethod::flush() { 1335 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1336 // Note that there are no valid oops in the nmethod anymore. 1337 assert(!is_osr_method() || is_unloaded() || is_zombie(), 1338 "osr nmethod must be unloaded or zombie before flushing"); 1339 assert(is_zombie() || is_osr_method(), "must be a zombie method"); 1340 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed"); 1341 assert_locked_or_safepoint(CodeCache_lock); 1342 1343 // completely deallocate this method 1344 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, p2i(this)); 1345 if (PrintMethodFlushing) { 1346 tty->print_cr("*flushing %s nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT 1347 "/Free CodeCache:" SIZE_FORMAT "Kb", 1348 is_osr_method() ? "osr" : "",_compile_id, p2i(this), CodeCache::blob_count(), 1349 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024); 1350 } 1351 1352 // We need to deallocate any ExceptionCache data. 1353 // Note that we do not need to grab the nmethod lock for this, it 1354 // better be thread safe if we're disposing of it! 1355 ExceptionCache* ec = exception_cache(); 1356 set_exception_cache(NULL); 1357 while(ec != NULL) { 1358 ExceptionCache* next = ec->next(); 1359 delete ec; 1360 ec = next; 1361 } 1362 1363 #if INCLUDE_JVMCI 1364 assert(_jvmci_installed_code == NULL, "should have been nulled out when transitioned to zombie"); 1365 assert(_speculation_log == NULL, "should have been nulled out when transitioned to zombie"); 1366 #endif 1367 1368 Universe::heap()->flush_nmethod(this); 1369 1370 CodeBlob::flush(); 1371 CodeCache::free(this); 1372 } 1373 1374 oop nmethod::oop_at(int index) const { 1375 if (index == 0) { 1376 return NULL; 1377 } 1378 return NativeAccess<AS_NO_KEEPALIVE>::oop_load(oop_addr_at(index)); 1379 } 1380 1381 // 1382 // Notify all classes this nmethod is dependent on that it is no 1383 // longer dependent. This should only be called in two situations. 1384 // First, when a nmethod transitions to a zombie all dependents need 1385 // to be clear. Since zombification happens at a safepoint there's no 1386 // synchronization issues. The second place is a little more tricky. 1387 // During phase 1 of mark sweep class unloading may happen and as a 1388 // result some nmethods may get unloaded. In this case the flushing 1389 // of dependencies must happen during phase 1 since after GC any 1390 // dependencies in the unloaded nmethod won't be updated, so 1391 // traversing the dependency information in unsafe. In that case this 1392 // function is called with a boolean argument and this function only 1393 // notifies instanceKlasses that are reachable 1394 1395 void nmethod::flush_dependencies(bool delete_immediately) { 1396 DEBUG_ONLY(bool called_by_gc = Universe::heap()->is_gc_active() || Thread::current()->is_ConcurrentGC_thread();) 1397 assert(called_by_gc != delete_immediately, 1398 "delete_immediately is false if and only if we are called during GC"); 1399 if (!has_flushed_dependencies()) { 1400 set_has_flushed_dependencies(); 1401 for (Dependencies::DepStream deps(this); deps.next(); ) { 1402 if (deps.type() == Dependencies::call_site_target_value) { 1403 // CallSite dependencies are managed on per-CallSite instance basis. 1404 oop call_site = deps.argument_oop(0); 1405 if (delete_immediately) { 1406 assert_locked_or_safepoint(CodeCache_lock); 1407 MethodHandles::remove_dependent_nmethod(call_site, this); 1408 } else { 1409 MethodHandles::clean_dependency_context(call_site); 1410 } 1411 } else { 1412 Klass* klass = deps.context_type(); 1413 if (klass == NULL) { 1414 continue; // ignore things like evol_method 1415 } 1416 // During GC delete_immediately is false, and liveness 1417 // of dependee determines class that needs to be updated. 1418 if (delete_immediately) { 1419 assert_locked_or_safepoint(CodeCache_lock); 1420 InstanceKlass::cast(klass)->remove_dependent_nmethod(this); 1421 } else if (klass->is_loader_alive()) { 1422 // The GC may clean dependency contexts concurrently and in parallel. 1423 InstanceKlass::cast(klass)->clean_dependency_context(); 1424 } 1425 } 1426 } 1427 } 1428 } 1429 1430 // ------------------------------------------------------------------ 1431 // post_compiled_method_load_event 1432 // new method for install_code() path 1433 // Transfer information from compilation to jvmti 1434 void nmethod::post_compiled_method_load_event() { 1435 1436 Method* moop = method(); 1437 HOTSPOT_COMPILED_METHOD_LOAD( 1438 (char *) moop->klass_name()->bytes(), 1439 moop->klass_name()->utf8_length(), 1440 (char *) moop->name()->bytes(), 1441 moop->name()->utf8_length(), 1442 (char *) moop->signature()->bytes(), 1443 moop->signature()->utf8_length(), 1444 insts_begin(), insts_size()); 1445 1446 if (JvmtiExport::should_post_compiled_method_load() || 1447 JvmtiExport::should_post_compiled_method_unload()) { 1448 get_and_cache_jmethod_id(); 1449 } 1450 1451 if (JvmtiExport::should_post_compiled_method_load()) { 1452 // Let the Service thread (which is a real Java thread) post the event 1453 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); 1454 JvmtiDeferredEventQueue::enqueue( 1455 JvmtiDeferredEvent::compiled_method_load_event(this)); 1456 } 1457 } 1458 1459 jmethodID nmethod::get_and_cache_jmethod_id() { 1460 if (_jmethod_id == NULL) { 1461 // Cache the jmethod_id since it can no longer be looked up once the 1462 // method itself has been marked for unloading. 1463 _jmethod_id = method()->jmethod_id(); 1464 } 1465 return _jmethod_id; 1466 } 1467 1468 void nmethod::post_compiled_method_unload() { 1469 if (unload_reported()) { 1470 // During unloading we transition to unloaded and then to zombie 1471 // and the unloading is reported during the first transition. 1472 return; 1473 } 1474 1475 assert(_method != NULL && !is_unloaded(), "just checking"); 1476 DTRACE_METHOD_UNLOAD_PROBE(method()); 1477 1478 // If a JVMTI agent has enabled the CompiledMethodUnload event then 1479 // post the event. Sometime later this nmethod will be made a zombie 1480 // by the sweeper but the Method* will not be valid at that point. 1481 // If the _jmethod_id is null then no load event was ever requested 1482 // so don't bother posting the unload. The main reason for this is 1483 // that the jmethodID is a weak reference to the Method* so if 1484 // it's being unloaded there's no way to look it up since the weak 1485 // ref will have been cleared. 1486 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) { 1487 assert(!unload_reported(), "already unloaded"); 1488 JvmtiDeferredEvent event = 1489 JvmtiDeferredEvent::compiled_method_unload_event(this, 1490 _jmethod_id, insts_begin()); 1491 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); 1492 JvmtiDeferredEventQueue::enqueue(event); 1493 } 1494 1495 // The JVMTI CompiledMethodUnload event can be enabled or disabled at 1496 // any time. As the nmethod is being unloaded now we mark it has 1497 // having the unload event reported - this will ensure that we don't 1498 // attempt to report the event in the unlikely scenario where the 1499 // event is enabled at the time the nmethod is made a zombie. 1500 set_unload_reported(); 1501 } 1502 1503 // Iterate over metadata calling this function. Used by RedefineClasses 1504 void nmethod::metadata_do(MetadataClosure* f) { 1505 { 1506 // Visit all immediate references that are embedded in the instruction stream. 1507 RelocIterator iter(this, oops_reloc_begin()); 1508 while (iter.next()) { 1509 if (iter.type() == relocInfo::metadata_type ) { 1510 metadata_Relocation* r = iter.metadata_reloc(); 1511 // In this metadata, we must only follow those metadatas directly embedded in 1512 // the code. Other metadatas (oop_index>0) are seen as part of 1513 // the metadata section below. 1514 assert(1 == (r->metadata_is_immediate()) + 1515 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()), 1516 "metadata must be found in exactly one place"); 1517 if (r->metadata_is_immediate() && r->metadata_value() != NULL) { 1518 Metadata* md = r->metadata_value(); 1519 if (md != _method) f->do_metadata(md); 1520 } 1521 } else if (iter.type() == relocInfo::virtual_call_type) { 1522 // Check compiledIC holders associated with this nmethod 1523 ResourceMark rm; 1524 CompiledIC *ic = CompiledIC_at(&iter); 1525 if (ic->is_icholder_call()) { 1526 CompiledICHolder* cichk = ic->cached_icholder(); 1527 f->do_metadata(cichk->holder_metadata()); 1528 f->do_metadata(cichk->holder_klass()); 1529 } else { 1530 Metadata* ic_oop = ic->cached_metadata(); 1531 if (ic_oop != NULL) { 1532 f->do_metadata(ic_oop); 1533 } 1534 } 1535 } 1536 } 1537 } 1538 1539 // Visit the metadata section 1540 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) { 1541 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops 1542 Metadata* md = *p; 1543 f->do_metadata(md); 1544 } 1545 1546 // Visit metadata not embedded in the other places. 1547 if (_method != NULL) f->do_metadata(_method); 1548 } 1549 1550 // The _is_unloading_state encodes a tuple comprising the unloading cycle 1551 // and the result of IsUnloadingBehaviour::is_unloading() fpr that cycle. 1552 // This is the bit layout of the _is_unloading_state byte: 00000CCU 1553 // CC refers to the cycle, which has 2 bits, and U refers to the result of 1554 // IsUnloadingBehaviour::is_unloading() for that unloading cycle. 1555 1556 class IsUnloadingState: public AllStatic { 1557 static const uint8_t _is_unloading_mask = 1; 1558 static const uint8_t _is_unloading_shift = 0; 1559 static const uint8_t _unloading_cycle_mask = 6; 1560 static const uint8_t _unloading_cycle_shift = 1; 1561 1562 static uint8_t set_is_unloading(uint8_t state, bool value) { 1563 state &= ~_is_unloading_mask; 1564 if (value) { 1565 state |= 1 << _is_unloading_shift; 1566 } 1567 assert(is_unloading(state) == value, "unexpected unloading cycle overflow"); 1568 return state; 1569 } 1570 1571 static uint8_t set_unloading_cycle(uint8_t state, uint8_t value) { 1572 state &= ~_unloading_cycle_mask; 1573 state |= value << _unloading_cycle_shift; 1574 assert(unloading_cycle(state) == value, "unexpected unloading cycle overflow"); 1575 return state; 1576 } 1577 1578 public: 1579 static bool is_unloading(uint8_t state) { return (state & _is_unloading_mask) >> _is_unloading_shift == 1; } 1580 static uint8_t unloading_cycle(uint8_t state) { return (state & _unloading_cycle_mask) >> _unloading_cycle_shift; } 1581 1582 static uint8_t create(bool is_unloading, uint8_t unloading_cycle) { 1583 uint8_t state = 0; 1584 state = set_is_unloading(state, is_unloading); 1585 state = set_unloading_cycle(state, unloading_cycle); 1586 return state; 1587 } 1588 }; 1589 1590 bool nmethod::is_unloading() { 1591 uint8_t state = RawAccess<MO_RELAXED>::load(&_is_unloading_state); 1592 bool state_is_unloading = IsUnloadingState::is_unloading(state); 1593 uint8_t state_unloading_cycle = IsUnloadingState::unloading_cycle(state); 1594 if (state_is_unloading) { 1595 return true; 1596 } 1597 uint8_t current_cycle = CodeCache::unloading_cycle(); 1598 if (state_unloading_cycle == current_cycle) { 1599 return false; 1600 } 1601 1602 // The IsUnloadingBehaviour is responsible for checking if there are any dead 1603 // oops in the CompiledMethod, by calling oops_do on it. 1604 state_unloading_cycle = current_cycle; 1605 1606 if (is_zombie()) { 1607 // Zombies without calculated unloading epoch are never unloading due to GC. 1608 1609 // There are no races where a previously observed is_unloading() nmethod 1610 // suddenly becomes not is_unloading() due to here being observed as zombie. 1611 1612 // With STW unloading, all is_alive() && is_unloading() nmethods are unlinked 1613 // and unloaded in the safepoint. That makes races where an nmethod is first 1614 // observed as is_alive() && is_unloading() and subsequently observed as 1615 // is_zombie() impossible. 1616 1617 // With concurrent unloading, all references to is_unloading() nmethods are 1618 // first unlinked (e.g. IC caches and dependency contexts). Then a global 1619 // handshake operation is performed with all JavaThreads before finally 1620 // unloading the nmethods. The sweeper never converts is_alive() && is_unloading() 1621 // nmethods to zombies; it waits for them to become is_unloaded(). So before 1622 // the global handshake, it is impossible for is_unloading() nmethods to 1623 // racingly become is_zombie(). And is_unloading() is calculated for all is_alive() 1624 // nmethods before taking that global handshake, meaning that it will never 1625 // be recalculated after the handshake. 1626 1627 // After that global handshake, is_unloading() nmethods are only observable 1628 // to the iterators, and they will never trigger recomputation of the cached 1629 // is_unloading_state, and hence may not suffer from such races. 1630 1631 state_is_unloading = false; 1632 } else { 1633 state_is_unloading = IsUnloadingBehaviour::current()->is_unloading(this); 1634 } 1635 1636 state = IsUnloadingState::create(state_is_unloading, state_unloading_cycle); 1637 1638 RawAccess<MO_RELAXED>::store(&_is_unloading_state, state); 1639 1640 return state_is_unloading; 1641 } 1642 1643 void nmethod::clear_unloading_state() { 1644 uint8_t state = IsUnloadingState::create(false, CodeCache::unloading_cycle()); 1645 RawAccess<MO_RELAXED>::store(&_is_unloading_state, state); 1646 } 1647 1648 1649 // This is called at the end of the strong tracing/marking phase of a 1650 // GC to unload an nmethod if it contains otherwise unreachable 1651 // oops. 1652 1653 void nmethod::do_unloading(bool unloading_occurred) { 1654 // Make sure the oop's ready to receive visitors 1655 assert(!is_zombie() && !is_unloaded(), 1656 "should not call follow on zombie or unloaded nmethod"); 1657 1658 if (is_unloading()) { 1659 make_unloaded(); 1660 } else { 1661 #if INCLUDE_JVMCI 1662 if (_jvmci_installed_code != NULL) { 1663 if (JNIHandles::is_global_weak_cleared(_jvmci_installed_code)) { 1664 if (_jvmci_installed_code_triggers_invalidation) { 1665 make_not_entrant(); 1666 } 1667 clear_jvmci_installed_code(); 1668 } 1669 } 1670 #endif 1671 1672 guarantee(unload_nmethod_caches(unloading_occurred), 1673 "Should not need transition stubs"); 1674 } 1675 } 1676 1677 void nmethod::oops_do(OopClosure* f, bool allow_zombie) { 1678 // make sure the oops ready to receive visitors 1679 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod"); 1680 assert(!is_unloaded(), "should not call follow on unloaded nmethod"); 1681 1682 // Prevent extra code cache walk for platforms that don't have immediate oops. 1683 if (relocInfo::mustIterateImmediateOopsInCode()) { 1684 RelocIterator iter(this, oops_reloc_begin()); 1685 1686 while (iter.next()) { 1687 if (iter.type() == relocInfo::oop_type ) { 1688 oop_Relocation* r = iter.oop_reloc(); 1689 // In this loop, we must only follow those oops directly embedded in 1690 // the code. Other oops (oop_index>0) are seen as part of scopes_oops. 1691 assert(1 == (r->oop_is_immediate()) + 1692 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 1693 "oop must be found in exactly one place"); 1694 if (r->oop_is_immediate() && r->oop_value() != NULL) { 1695 f->do_oop(r->oop_addr()); 1696 } 1697 } 1698 } 1699 } 1700 1701 // Scopes 1702 // This includes oop constants not inlined in the code stream. 1703 for (oop* p = oops_begin(); p < oops_end(); p++) { 1704 if (*p == Universe::non_oop_word()) continue; // skip non-oops 1705 f->do_oop(p); 1706 } 1707 } 1708 1709 #define NMETHOD_SENTINEL ((nmethod*)badAddress) 1710 1711 nmethod* volatile nmethod::_oops_do_mark_nmethods; 1712 1713 // An nmethod is "marked" if its _mark_link is set non-null. 1714 // Even if it is the end of the linked list, it will have a non-null link value, 1715 // as long as it is on the list. 1716 // This code must be MP safe, because it is used from parallel GC passes. 1717 bool nmethod::test_set_oops_do_mark() { 1718 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called"); 1719 if (_oops_do_mark_link == NULL) { 1720 // Claim this nmethod for this thread to mark. 1721 if (Atomic::replace_if_null(NMETHOD_SENTINEL, &_oops_do_mark_link)) { 1722 // Atomically append this nmethod (now claimed) to the head of the list: 1723 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods; 1724 for (;;) { 1725 nmethod* required_mark_nmethods = observed_mark_nmethods; 1726 _oops_do_mark_link = required_mark_nmethods; 1727 observed_mark_nmethods = 1728 Atomic::cmpxchg(this, &_oops_do_mark_nmethods, required_mark_nmethods); 1729 if (observed_mark_nmethods == required_mark_nmethods) 1730 break; 1731 } 1732 // Mark was clear when we first saw this guy. 1733 LogTarget(Trace, gc, nmethod) lt; 1734 if (lt.is_enabled()) { 1735 LogStream ls(lt); 1736 CompileTask::print(&ls, this, "oops_do, mark", /*short_form:*/ true); 1737 } 1738 return false; 1739 } 1740 } 1741 // On fall through, another racing thread marked this nmethod before we did. 1742 return true; 1743 } 1744 1745 void nmethod::oops_do_marking_prologue() { 1746 log_trace(gc, nmethod)("oops_do_marking_prologue"); 1747 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row"); 1748 // We use cmpxchg instead of regular assignment here because the user 1749 // may fork a bunch of threads, and we need them all to see the same state. 1750 nmethod* observed = Atomic::cmpxchg(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, (nmethod*)NULL); 1751 guarantee(observed == NULL, "no races in this sequential code"); 1752 } 1753 1754 void nmethod::oops_do_marking_epilogue() { 1755 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row"); 1756 nmethod* cur = _oops_do_mark_nmethods; 1757 while (cur != NMETHOD_SENTINEL) { 1758 assert(cur != NULL, "not NULL-terminated"); 1759 nmethod* next = cur->_oops_do_mark_link; 1760 cur->_oops_do_mark_link = NULL; 1761 DEBUG_ONLY(cur->verify_oop_relocations()); 1762 1763 LogTarget(Trace, gc, nmethod) lt; 1764 if (lt.is_enabled()) { 1765 LogStream ls(lt); 1766 CompileTask::print(&ls, cur, "oops_do, unmark", /*short_form:*/ true); 1767 } 1768 cur = next; 1769 } 1770 nmethod* required = _oops_do_mark_nmethods; 1771 nmethod* observed = Atomic::cmpxchg((nmethod*)NULL, &_oops_do_mark_nmethods, required); 1772 guarantee(observed == required, "no races in this sequential code"); 1773 log_trace(gc, nmethod)("oops_do_marking_epilogue"); 1774 } 1775 1776 inline bool includes(void* p, void* from, void* to) { 1777 return from <= p && p < to; 1778 } 1779 1780 1781 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) { 1782 assert(count >= 2, "must be sentinel values, at least"); 1783 1784 #ifdef ASSERT 1785 // must be sorted and unique; we do a binary search in find_pc_desc() 1786 int prev_offset = pcs[0].pc_offset(); 1787 assert(prev_offset == PcDesc::lower_offset_limit, 1788 "must start with a sentinel"); 1789 for (int i = 1; i < count; i++) { 1790 int this_offset = pcs[i].pc_offset(); 1791 assert(this_offset > prev_offset, "offsets must be sorted"); 1792 prev_offset = this_offset; 1793 } 1794 assert(prev_offset == PcDesc::upper_offset_limit, 1795 "must end with a sentinel"); 1796 #endif //ASSERT 1797 1798 // Search for MethodHandle invokes and tag the nmethod. 1799 for (int i = 0; i < count; i++) { 1800 if (pcs[i].is_method_handle_invoke()) { 1801 set_has_method_handle_invokes(true); 1802 break; 1803 } 1804 } 1805 assert(has_method_handle_invokes() == (_deopt_mh_handler_begin != NULL), "must have deopt mh handler"); 1806 1807 int size = count * sizeof(PcDesc); 1808 assert(scopes_pcs_size() >= size, "oob"); 1809 memcpy(scopes_pcs_begin(), pcs, size); 1810 1811 // Adjust the final sentinel downward. 1812 PcDesc* last_pc = &scopes_pcs_begin()[count-1]; 1813 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity"); 1814 last_pc->set_pc_offset(content_size() + 1); 1815 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) { 1816 // Fill any rounding gaps with copies of the last record. 1817 last_pc[1] = last_pc[0]; 1818 } 1819 // The following assert could fail if sizeof(PcDesc) is not 1820 // an integral multiple of oopSize (the rounding term). 1821 // If it fails, change the logic to always allocate a multiple 1822 // of sizeof(PcDesc), and fill unused words with copies of *last_pc. 1823 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly"); 1824 } 1825 1826 void nmethod::copy_scopes_data(u_char* buffer, int size) { 1827 assert(scopes_data_size() >= size, "oob"); 1828 memcpy(scopes_data_begin(), buffer, size); 1829 } 1830 1831 #ifdef ASSERT 1832 static PcDesc* linear_search(const PcDescSearch& search, int pc_offset, bool approximate) { 1833 PcDesc* lower = search.scopes_pcs_begin(); 1834 PcDesc* upper = search.scopes_pcs_end(); 1835 lower += 1; // exclude initial sentinel 1836 PcDesc* res = NULL; 1837 for (PcDesc* p = lower; p < upper; p++) { 1838 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc 1839 if (match_desc(p, pc_offset, approximate)) { 1840 if (res == NULL) 1841 res = p; 1842 else 1843 res = (PcDesc*) badAddress; 1844 } 1845 } 1846 return res; 1847 } 1848 #endif 1849 1850 1851 // Finds a PcDesc with real-pc equal to "pc" 1852 PcDesc* PcDescContainer::find_pc_desc_internal(address pc, bool approximate, const PcDescSearch& search) { 1853 address base_address = search.code_begin(); 1854 if ((pc < base_address) || 1855 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) { 1856 return NULL; // PC is wildly out of range 1857 } 1858 int pc_offset = (int) (pc - base_address); 1859 1860 // Check the PcDesc cache if it contains the desired PcDesc 1861 // (This as an almost 100% hit rate.) 1862 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate); 1863 if (res != NULL) { 1864 assert(res == linear_search(search, pc_offset, approximate), "cache ok"); 1865 return res; 1866 } 1867 1868 // Fallback algorithm: quasi-linear search for the PcDesc 1869 // Find the last pc_offset less than the given offset. 1870 // The successor must be the required match, if there is a match at all. 1871 // (Use a fixed radix to avoid expensive affine pointer arithmetic.) 1872 PcDesc* lower = search.scopes_pcs_begin(); 1873 PcDesc* upper = search.scopes_pcs_end(); 1874 upper -= 1; // exclude final sentinel 1875 if (lower >= upper) return NULL; // native method; no PcDescs at all 1876 1877 #define assert_LU_OK \ 1878 /* invariant on lower..upper during the following search: */ \ 1879 assert(lower->pc_offset() < pc_offset, "sanity"); \ 1880 assert(upper->pc_offset() >= pc_offset, "sanity") 1881 assert_LU_OK; 1882 1883 // Use the last successful return as a split point. 1884 PcDesc* mid = _pc_desc_cache.last_pc_desc(); 1885 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 1886 if (mid->pc_offset() < pc_offset) { 1887 lower = mid; 1888 } else { 1889 upper = mid; 1890 } 1891 1892 // Take giant steps at first (4096, then 256, then 16, then 1) 1893 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1); 1894 const int RADIX = (1 << LOG2_RADIX); 1895 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) { 1896 while ((mid = lower + step) < upper) { 1897 assert_LU_OK; 1898 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 1899 if (mid->pc_offset() < pc_offset) { 1900 lower = mid; 1901 } else { 1902 upper = mid; 1903 break; 1904 } 1905 } 1906 assert_LU_OK; 1907 } 1908 1909 // Sneak up on the value with a linear search of length ~16. 1910 while (true) { 1911 assert_LU_OK; 1912 mid = lower + 1; 1913 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 1914 if (mid->pc_offset() < pc_offset) { 1915 lower = mid; 1916 } else { 1917 upper = mid; 1918 break; 1919 } 1920 } 1921 #undef assert_LU_OK 1922 1923 if (match_desc(upper, pc_offset, approximate)) { 1924 assert(upper == linear_search(search, pc_offset, approximate), "search ok"); 1925 _pc_desc_cache.add_pc_desc(upper); 1926 return upper; 1927 } else { 1928 assert(NULL == linear_search(search, pc_offset, approximate), "search ok"); 1929 return NULL; 1930 } 1931 } 1932 1933 1934 void nmethod::check_all_dependencies(DepChange& changes) { 1935 // Checked dependencies are allocated into this ResourceMark 1936 ResourceMark rm; 1937 1938 // Turn off dependency tracing while actually testing dependencies. 1939 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) ); 1940 1941 typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash, 1942 &DependencySignature::equals, 11027> DepTable; 1943 1944 DepTable* table = new DepTable(); 1945 1946 // Iterate over live nmethods and check dependencies of all nmethods that are not 1947 // marked for deoptimization. A particular dependency is only checked once. 1948 NMethodIterator iter(NMethodIterator::only_alive_and_not_unloading); 1949 while(iter.next()) { 1950 nmethod* nm = iter.method(); 1951 // Only notify for live nmethods 1952 if (!nm->is_marked_for_deoptimization()) { 1953 for (Dependencies::DepStream deps(nm); deps.next(); ) { 1954 // Construct abstraction of a dependency. 1955 DependencySignature* current_sig = new DependencySignature(deps); 1956 1957 // Determine if dependency is already checked. table->put(...) returns 1958 // 'true' if the dependency is added (i.e., was not in the hashtable). 1959 if (table->put(*current_sig, 1)) { 1960 if (deps.check_dependency() != NULL) { 1961 // Dependency checking failed. Print out information about the failed 1962 // dependency and finally fail with an assert. We can fail here, since 1963 // dependency checking is never done in a product build. 1964 tty->print_cr("Failed dependency:"); 1965 changes.print(); 1966 nm->print(); 1967 nm->print_dependencies(); 1968 assert(false, "Should have been marked for deoptimization"); 1969 } 1970 } 1971 } 1972 } 1973 } 1974 } 1975 1976 bool nmethod::check_dependency_on(DepChange& changes) { 1977 // What has happened: 1978 // 1) a new class dependee has been added 1979 // 2) dependee and all its super classes have been marked 1980 bool found_check = false; // set true if we are upset 1981 for (Dependencies::DepStream deps(this); deps.next(); ) { 1982 // Evaluate only relevant dependencies. 1983 if (deps.spot_check_dependency_at(changes) != NULL) { 1984 found_check = true; 1985 NOT_DEBUG(break); 1986 } 1987 } 1988 return found_check; 1989 } 1990 1991 bool nmethod::is_evol_dependent() { 1992 for (Dependencies::DepStream deps(this); deps.next(); ) { 1993 if (deps.type() == Dependencies::evol_method) { 1994 Method* method = deps.method_argument(0); 1995 if (method->is_old()) { 1996 if (log_is_enabled(Debug, redefine, class, nmethod)) { 1997 ResourceMark rm; 1998 log_debug(redefine, class, nmethod) 1999 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)", 2000 _method->method_holder()->external_name(), 2001 _method->name()->as_C_string(), 2002 _method->signature()->as_C_string(), 2003 compile_id(), 2004 method->method_holder()->external_name(), 2005 method->name()->as_C_string(), 2006 method->signature()->as_C_string()); 2007 } 2008 if (TraceDependencies || LogCompilation) 2009 deps.log_dependency(method->method_holder()); 2010 return true; 2011 } 2012 } 2013 } 2014 return false; 2015 } 2016 2017 // Called from mark_for_deoptimization, when dependee is invalidated. 2018 bool nmethod::is_dependent_on_method(Method* dependee) { 2019 for (Dependencies::DepStream deps(this); deps.next(); ) { 2020 if (deps.type() != Dependencies::evol_method) 2021 continue; 2022 Method* method = deps.method_argument(0); 2023 if (method == dependee) return true; 2024 } 2025 return false; 2026 } 2027 2028 2029 bool nmethod::is_patchable_at(address instr_addr) { 2030 assert(insts_contains(instr_addr), "wrong nmethod used"); 2031 if (is_zombie()) { 2032 // a zombie may never be patched 2033 return false; 2034 } 2035 return true; 2036 } 2037 2038 2039 address nmethod::continuation_for_implicit_exception(address pc) { 2040 // Exception happened outside inline-cache check code => we are inside 2041 // an active nmethod => use cpc to determine a return address 2042 int exception_offset = pc - code_begin(); 2043 int cont_offset = ImplicitExceptionTable(this).at( exception_offset ); 2044 #ifdef ASSERT 2045 if (cont_offset == 0) { 2046 Thread* thread = Thread::current(); 2047 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY 2048 HandleMark hm(thread); 2049 ResourceMark rm(thread); 2050 CodeBlob* cb = CodeCache::find_blob(pc); 2051 assert(cb != NULL && cb == this, ""); 2052 ttyLocker ttyl; 2053 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, p2i(pc)); 2054 print(); 2055 method()->print_codes(); 2056 print_code(); 2057 print_pcs(); 2058 } 2059 #endif 2060 if (cont_offset == 0) { 2061 // Let the normal error handling report the exception 2062 return NULL; 2063 } 2064 return code_begin() + cont_offset; 2065 } 2066 2067 2068 2069 void nmethod_init() { 2070 // make sure you didn't forget to adjust the filler fields 2071 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word"); 2072 } 2073 2074 2075 //------------------------------------------------------------------------------------------- 2076 2077 2078 // QQQ might we make this work from a frame?? 2079 nmethodLocker::nmethodLocker(address pc) { 2080 CodeBlob* cb = CodeCache::find_blob(pc); 2081 guarantee(cb != NULL && cb->is_compiled(), "bad pc for a nmethod found"); 2082 _nm = cb->as_compiled_method(); 2083 lock_nmethod(_nm); 2084 } 2085 2086 // Only JvmtiDeferredEvent::compiled_method_unload_event() 2087 // should pass zombie_ok == true. 2088 void nmethodLocker::lock_nmethod(CompiledMethod* cm, bool zombie_ok) { 2089 if (cm == NULL) return; 2090 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method 2091 nmethod* nm = cm->as_nmethod(); 2092 Atomic::inc(&nm->_lock_count); 2093 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method"); 2094 } 2095 2096 void nmethodLocker::unlock_nmethod(CompiledMethod* cm) { 2097 if (cm == NULL) return; 2098 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method 2099 nmethod* nm = cm->as_nmethod(); 2100 Atomic::dec(&nm->_lock_count); 2101 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock"); 2102 } 2103 2104 2105 // ----------------------------------------------------------------------------- 2106 // Verification 2107 2108 class VerifyOopsClosure: public OopClosure { 2109 nmethod* _nm; 2110 bool _ok; 2111 public: 2112 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { } 2113 bool ok() { return _ok; } 2114 virtual void do_oop(oop* p) { 2115 if (oopDesc::is_oop_or_null(*p)) return; 2116 if (_ok) { 2117 _nm->print_nmethod(true); 2118 _ok = false; 2119 } 2120 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)", 2121 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm)); 2122 } 2123 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2124 }; 2125 2126 void nmethod::verify() { 2127 2128 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant 2129 // seems odd. 2130 2131 if (is_zombie() || is_not_entrant() || is_unloaded()) 2132 return; 2133 2134 // Make sure all the entry points are correctly aligned for patching. 2135 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point()); 2136 2137 // assert(oopDesc::is_oop(method()), "must be valid"); 2138 2139 ResourceMark rm; 2140 2141 if (!CodeCache::contains(this)) { 2142 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this)); 2143 } 2144 2145 if(is_native_method() ) 2146 return; 2147 2148 nmethod* nm = CodeCache::find_nmethod(verified_entry_point()); 2149 if (nm != this) { 2150 fatal("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this)); 2151 } 2152 2153 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2154 if (! p->verify(this)) { 2155 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this)); 2156 } 2157 } 2158 2159 VerifyOopsClosure voc(this); 2160 oops_do(&voc); 2161 assert(voc.ok(), "embedded oops must be OK"); 2162 Universe::heap()->verify_nmethod(this); 2163 2164 verify_scopes(); 2165 } 2166 2167 2168 void nmethod::verify_interrupt_point(address call_site) { 2169 // Verify IC only when nmethod installation is finished. 2170 if (!is_not_installed()) { 2171 if (CompiledICLocker::is_safe(this)) { 2172 CompiledIC_at(this, call_site); 2173 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); 2174 } else { 2175 CompiledICLocker ml_verify(this); 2176 CompiledIC_at(this, call_site); 2177 } 2178 } 2179 2180 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address()); 2181 assert(pd != NULL, "PcDesc must exist"); 2182 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(), 2183 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(), 2184 pd->return_oop()); 2185 !sd->is_top(); sd = sd->sender()) { 2186 sd->verify(); 2187 } 2188 } 2189 2190 void nmethod::verify_scopes() { 2191 if( !method() ) return; // Runtime stubs have no scope 2192 if (method()->is_native()) return; // Ignore stub methods. 2193 // iterate through all interrupt point 2194 // and verify the debug information is valid. 2195 RelocIterator iter((nmethod*)this); 2196 while (iter.next()) { 2197 address stub = NULL; 2198 switch (iter.type()) { 2199 case relocInfo::virtual_call_type: 2200 verify_interrupt_point(iter.addr()); 2201 break; 2202 case relocInfo::opt_virtual_call_type: 2203 stub = iter.opt_virtual_call_reloc()->static_stub(false); 2204 verify_interrupt_point(iter.addr()); 2205 break; 2206 case relocInfo::static_call_type: 2207 stub = iter.static_call_reloc()->static_stub(false); 2208 //verify_interrupt_point(iter.addr()); 2209 break; 2210 case relocInfo::runtime_call_type: 2211 case relocInfo::runtime_call_w_cp_type: { 2212 address destination = iter.reloc()->value(); 2213 // Right now there is no way to find out which entries support 2214 // an interrupt point. It would be nice if we had this 2215 // information in a table. 2216 break; 2217 } 2218 default: 2219 break; 2220 } 2221 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section"); 2222 } 2223 } 2224 2225 2226 // ----------------------------------------------------------------------------- 2227 // Printing operations 2228 2229 void nmethod::print() const { 2230 ResourceMark rm; 2231 ttyLocker ttyl; // keep the following output all in one block 2232 2233 tty->print("Compiled method "); 2234 2235 if (is_compiled_by_c1()) { 2236 tty->print("(c1) "); 2237 } else if (is_compiled_by_c2()) { 2238 tty->print("(c2) "); 2239 } else if (is_compiled_by_jvmci()) { 2240 tty->print("(JVMCI) "); 2241 } else { 2242 tty->print("(nm) "); 2243 } 2244 2245 print_on(tty, NULL); 2246 2247 if (WizardMode) { 2248 tty->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this)); 2249 tty->print(" for method " INTPTR_FORMAT , p2i(method())); 2250 tty->print(" { "); 2251 tty->print_cr("%s ", state()); 2252 tty->print_cr("}:"); 2253 } 2254 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2255 p2i(this), 2256 p2i(this) + size(), 2257 size()); 2258 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2259 p2i(relocation_begin()), 2260 p2i(relocation_end()), 2261 relocation_size()); 2262 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2263 p2i(consts_begin()), 2264 p2i(consts_end()), 2265 consts_size()); 2266 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2267 p2i(insts_begin()), 2268 p2i(insts_end()), 2269 insts_size()); 2270 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2271 p2i(stub_begin()), 2272 p2i(stub_end()), 2273 stub_size()); 2274 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2275 p2i(oops_begin()), 2276 p2i(oops_end()), 2277 oops_size()); 2278 if (metadata_size () > 0) tty->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2279 p2i(metadata_begin()), 2280 p2i(metadata_end()), 2281 metadata_size()); 2282 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2283 p2i(scopes_data_begin()), 2284 p2i(scopes_data_end()), 2285 scopes_data_size()); 2286 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2287 p2i(scopes_pcs_begin()), 2288 p2i(scopes_pcs_end()), 2289 scopes_pcs_size()); 2290 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2291 p2i(dependencies_begin()), 2292 p2i(dependencies_end()), 2293 dependencies_size()); 2294 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2295 p2i(handler_table_begin()), 2296 p2i(handler_table_end()), 2297 handler_table_size()); 2298 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2299 p2i(nul_chk_table_begin()), 2300 p2i(nul_chk_table_end()), 2301 nul_chk_table_size()); 2302 } 2303 2304 #ifndef PRODUCT 2305 2306 void nmethod::print_scopes() { 2307 // Find the first pc desc for all scopes in the code and print it. 2308 ResourceMark rm; 2309 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2310 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null) 2311 continue; 2312 2313 ScopeDesc* sd = scope_desc_at(p->real_pc(this)); 2314 while (sd != NULL) { 2315 sd->print_on(tty, p); 2316 sd = sd->sender(); 2317 } 2318 } 2319 } 2320 2321 void nmethod::print_dependencies() { 2322 ResourceMark rm; 2323 ttyLocker ttyl; // keep the following output all in one block 2324 tty->print_cr("Dependencies:"); 2325 for (Dependencies::DepStream deps(this); deps.next(); ) { 2326 deps.print_dependency(); 2327 Klass* ctxk = deps.context_type(); 2328 if (ctxk != NULL) { 2329 if (ctxk->is_instance_klass() && InstanceKlass::cast(ctxk)->is_dependent_nmethod(this)) { 2330 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name()); 2331 } 2332 } 2333 deps.log_dependency(); // put it into the xml log also 2334 } 2335 } 2336 2337 2338 void nmethod::print_relocations() { 2339 ResourceMark m; // in case methods get printed via the debugger 2340 tty->print_cr("relocations:"); 2341 RelocIterator iter(this); 2342 iter.print(); 2343 } 2344 2345 2346 void nmethod::print_pcs() { 2347 ResourceMark m; // in case methods get printed via debugger 2348 tty->print_cr("pc-bytecode offsets:"); 2349 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2350 p->print(this); 2351 } 2352 } 2353 2354 void nmethod::print_recorded_oops() { 2355 tty->print_cr("Recorded oops:"); 2356 for (int i = 0; i < oops_count(); i++) { 2357 oop o = oop_at(i); 2358 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(o)); 2359 if (o == Universe::non_oop_word()) { 2360 tty->print("non-oop word"); 2361 } else { 2362 if (o != NULL) { 2363 o->print_value(); 2364 } else { 2365 tty->print_cr("NULL"); 2366 } 2367 } 2368 tty->cr(); 2369 } 2370 } 2371 2372 void nmethod::print_recorded_metadata() { 2373 tty->print_cr("Recorded metadata:"); 2374 for (int i = 0; i < metadata_count(); i++) { 2375 Metadata* m = metadata_at(i); 2376 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(m)); 2377 if (m == (Metadata*)Universe::non_oop_word()) { 2378 tty->print("non-metadata word"); 2379 } else { 2380 Metadata::print_value_on_maybe_null(tty, m); 2381 } 2382 tty->cr(); 2383 } 2384 } 2385 2386 #endif // PRODUCT 2387 2388 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) { 2389 RelocIterator iter(this, begin, end); 2390 bool have_one = false; 2391 while (iter.next()) { 2392 have_one = true; 2393 switch (iter.type()) { 2394 case relocInfo::none: return "no_reloc"; 2395 case relocInfo::oop_type: { 2396 stringStream st; 2397 oop_Relocation* r = iter.oop_reloc(); 2398 oop obj = r->oop_value(); 2399 st.print("oop("); 2400 if (obj == NULL) st.print("NULL"); 2401 else obj->print_value_on(&st); 2402 st.print(")"); 2403 return st.as_string(); 2404 } 2405 case relocInfo::metadata_type: { 2406 stringStream st; 2407 metadata_Relocation* r = iter.metadata_reloc(); 2408 Metadata* obj = r->metadata_value(); 2409 st.print("metadata("); 2410 if (obj == NULL) st.print("NULL"); 2411 else obj->print_value_on(&st); 2412 st.print(")"); 2413 return st.as_string(); 2414 } 2415 case relocInfo::runtime_call_type: 2416 case relocInfo::runtime_call_w_cp_type: { 2417 stringStream st; 2418 st.print("runtime_call"); 2419 CallRelocation* r = (CallRelocation*)iter.reloc(); 2420 address dest = r->destination(); 2421 CodeBlob* cb = CodeCache::find_blob(dest); 2422 if (cb != NULL) { 2423 st.print(" %s", cb->name()); 2424 } else { 2425 ResourceMark rm; 2426 const int buflen = 1024; 2427 char* buf = NEW_RESOURCE_ARRAY(char, buflen); 2428 int offset; 2429 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) { 2430 st.print(" %s", buf); 2431 if (offset != 0) { 2432 st.print("+%d", offset); 2433 } 2434 } 2435 } 2436 return st.as_string(); 2437 } 2438 case relocInfo::virtual_call_type: { 2439 stringStream st; 2440 st.print_raw("virtual_call"); 2441 virtual_call_Relocation* r = iter.virtual_call_reloc(); 2442 Method* m = r->method_value(); 2443 if (m != NULL) { 2444 assert(m->is_method(), ""); 2445 m->print_short_name(&st); 2446 } 2447 return st.as_string(); 2448 } 2449 case relocInfo::opt_virtual_call_type: { 2450 stringStream st; 2451 st.print_raw("optimized virtual_call"); 2452 opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc(); 2453 Method* m = r->method_value(); 2454 if (m != NULL) { 2455 assert(m->is_method(), ""); 2456 m->print_short_name(&st); 2457 } 2458 return st.as_string(); 2459 } 2460 case relocInfo::static_call_type: { 2461 stringStream st; 2462 st.print_raw("static_call"); 2463 static_call_Relocation* r = iter.static_call_reloc(); 2464 Method* m = r->method_value(); 2465 if (m != NULL) { 2466 assert(m->is_method(), ""); 2467 m->print_short_name(&st); 2468 } 2469 return st.as_string(); 2470 } 2471 case relocInfo::static_stub_type: return "static_stub"; 2472 case relocInfo::external_word_type: return "external_word"; 2473 case relocInfo::internal_word_type: return "internal_word"; 2474 case relocInfo::section_word_type: return "section_word"; 2475 case relocInfo::poll_type: return "poll"; 2476 case relocInfo::poll_return_type: return "poll_return"; 2477 case relocInfo::trampoline_stub_type: return "trampoline_stub"; 2478 case relocInfo::type_mask: return "type_bit_mask"; 2479 2480 default: 2481 break; 2482 } 2483 } 2484 return have_one ? "other" : NULL; 2485 } 2486 2487 // Return a the last scope in (begin..end] 2488 ScopeDesc* nmethod::scope_desc_in(address begin, address end) { 2489 PcDesc* p = pc_desc_near(begin+1); 2490 if (p != NULL && p->real_pc(this) <= end) { 2491 return new ScopeDesc(this, p->scope_decode_offset(), 2492 p->obj_decode_offset(), p->should_reexecute(), p->rethrow_exception(), 2493 p->return_oop()); 2494 } 2495 return NULL; 2496 } 2497 2498 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const { 2499 if (block_begin == entry_point()) stream->print_cr("[Entry Point]"); 2500 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]"); 2501 if (JVMCI_ONLY(_exception_offset >= 0 &&) block_begin == exception_begin()) stream->print_cr("[Exception Handler]"); 2502 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]"); 2503 if (JVMCI_ONLY(_deopt_handler_begin != NULL &&) block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]"); 2504 2505 if (has_method_handle_invokes()) 2506 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]"); 2507 2508 if (block_begin == consts_begin()) stream->print_cr("[Constants]"); 2509 2510 if (block_begin == entry_point()) { 2511 methodHandle m = method(); 2512 if (m.not_null()) { 2513 stream->print(" # "); 2514 m->print_value_on(stream); 2515 stream->cr(); 2516 } 2517 if (m.not_null() && !is_osr_method()) { 2518 ResourceMark rm; 2519 int sizeargs = m->size_of_parameters(); 2520 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs); 2521 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs); 2522 { 2523 int sig_index = 0; 2524 if (!m->is_static()) 2525 sig_bt[sig_index++] = T_OBJECT; // 'this' 2526 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) { 2527 BasicType t = ss.type(); 2528 sig_bt[sig_index++] = t; 2529 if (type2size[t] == 2) { 2530 sig_bt[sig_index++] = T_VOID; 2531 } else { 2532 assert(type2size[t] == 1, "size is 1 or 2"); 2533 } 2534 } 2535 assert(sig_index == sizeargs, ""); 2536 } 2537 const char* spname = "sp"; // make arch-specific? 2538 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false); 2539 int stack_slot_offset = this->frame_size() * wordSize; 2540 int tab1 = 14, tab2 = 24; 2541 int sig_index = 0; 2542 int arg_index = (m->is_static() ? 0 : -1); 2543 bool did_old_sp = false; 2544 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) { 2545 bool at_this = (arg_index == -1); 2546 bool at_old_sp = false; 2547 BasicType t = (at_this ? T_OBJECT : ss.type()); 2548 assert(t == sig_bt[sig_index], "sigs in sync"); 2549 if (at_this) 2550 stream->print(" # this: "); 2551 else 2552 stream->print(" # parm%d: ", arg_index); 2553 stream->move_to(tab1); 2554 VMReg fst = regs[sig_index].first(); 2555 VMReg snd = regs[sig_index].second(); 2556 if (fst->is_reg()) { 2557 stream->print("%s", fst->name()); 2558 if (snd->is_valid()) { 2559 stream->print(":%s", snd->name()); 2560 } 2561 } else if (fst->is_stack()) { 2562 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset; 2563 if (offset == stack_slot_offset) at_old_sp = true; 2564 stream->print("[%s+0x%x]", spname, offset); 2565 } else { 2566 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd); 2567 } 2568 stream->print(" "); 2569 stream->move_to(tab2); 2570 stream->print("= "); 2571 if (at_this) { 2572 m->method_holder()->print_value_on(stream); 2573 } else { 2574 bool did_name = false; 2575 if (!at_this && ss.is_object()) { 2576 Symbol* name = ss.as_symbol_or_null(); 2577 if (name != NULL) { 2578 name->print_value_on(stream); 2579 did_name = true; 2580 } 2581 } 2582 if (!did_name) 2583 stream->print("%s", type2name(t)); 2584 } 2585 if (at_old_sp) { 2586 stream->print(" (%s of caller)", spname); 2587 did_old_sp = true; 2588 } 2589 stream->cr(); 2590 sig_index += type2size[t]; 2591 arg_index += 1; 2592 if (!at_this) ss.next(); 2593 } 2594 if (!did_old_sp) { 2595 stream->print(" # "); 2596 stream->move_to(tab1); 2597 stream->print("[%s+0x%x]", spname, stack_slot_offset); 2598 stream->print(" (%s of caller)", spname); 2599 stream->cr(); 2600 } 2601 } 2602 } 2603 } 2604 2605 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) { 2606 // First, find an oopmap in (begin, end]. 2607 // We use the odd half-closed interval so that oop maps and scope descs 2608 // which are tied to the byte after a call are printed with the call itself. 2609 address base = code_begin(); 2610 ImmutableOopMapSet* oms = oop_maps(); 2611 if (oms != NULL) { 2612 for (int i = 0, imax = oms->count(); i < imax; i++) { 2613 const ImmutableOopMapPair* pair = oms->pair_at(i); 2614 const ImmutableOopMap* om = pair->get_from(oms); 2615 address pc = base + pair->pc_offset(); 2616 if (pc > begin) { 2617 if (pc <= end) { 2618 st->move_to(column); 2619 st->print("; "); 2620 om->print_on(st); 2621 } 2622 break; 2623 } 2624 } 2625 } 2626 2627 // Print any debug info present at this pc. 2628 ScopeDesc* sd = scope_desc_in(begin, end); 2629 if (sd != NULL) { 2630 st->move_to(column); 2631 if (sd->bci() == SynchronizationEntryBCI) { 2632 st->print(";*synchronization entry"); 2633 } else if (sd->bci() == AfterBci) { 2634 st->print(";* method exit (unlocked if synchronized)"); 2635 } else if (sd->bci() == UnwindBci) { 2636 st->print(";* unwind (locked if synchronized)"); 2637 } else if (sd->bci() == AfterExceptionBci) { 2638 st->print(";* unwind (unlocked if synchronized)"); 2639 } else if (sd->bci() == UnknownBci) { 2640 st->print(";* unknown"); 2641 } else if (sd->bci() == InvalidFrameStateBci) { 2642 st->print(";* invalid frame state"); 2643 } else { 2644 if (sd->method() == NULL) { 2645 st->print("method is NULL"); 2646 } else if (sd->method()->is_native()) { 2647 st->print("method is native"); 2648 } else { 2649 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci()); 2650 st->print(";*%s", Bytecodes::name(bc)); 2651 switch (bc) { 2652 case Bytecodes::_invokevirtual: 2653 case Bytecodes::_invokespecial: 2654 case Bytecodes::_invokestatic: 2655 case Bytecodes::_invokeinterface: 2656 { 2657 Bytecode_invoke invoke(sd->method(), sd->bci()); 2658 st->print(" "); 2659 if (invoke.name() != NULL) 2660 invoke.name()->print_symbol_on(st); 2661 else 2662 st->print("<UNKNOWN>"); 2663 break; 2664 } 2665 case Bytecodes::_getfield: 2666 case Bytecodes::_putfield: 2667 case Bytecodes::_getstatic: 2668 case Bytecodes::_putstatic: 2669 { 2670 Bytecode_field field(sd->method(), sd->bci()); 2671 st->print(" "); 2672 if (field.name() != NULL) 2673 field.name()->print_symbol_on(st); 2674 else 2675 st->print("<UNKNOWN>"); 2676 } 2677 default: 2678 break; 2679 } 2680 } 2681 st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop()); 2682 } 2683 2684 // Print all scopes 2685 for (;sd != NULL; sd = sd->sender()) { 2686 st->move_to(column); 2687 st->print("; -"); 2688 if (sd->method() == NULL) { 2689 st->print("method is NULL"); 2690 } else { 2691 sd->method()->print_short_name(st); 2692 } 2693 int lineno = sd->method()->line_number_from_bci(sd->bci()); 2694 if (lineno != -1) { 2695 st->print("@%d (line %d)", sd->bci(), lineno); 2696 } else { 2697 st->print("@%d", sd->bci()); 2698 } 2699 st->cr(); 2700 } 2701 } 2702 2703 // Print relocation information 2704 const char* str = reloc_string_for(begin, end); 2705 if (str != NULL) { 2706 if (sd != NULL) st->cr(); 2707 st->move_to(column); 2708 st->print("; {%s}", str); 2709 } 2710 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin()); 2711 if (cont_offset != 0) { 2712 st->move_to(column); 2713 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset)); 2714 } 2715 2716 } 2717 2718 class DirectNativeCallWrapper: public NativeCallWrapper { 2719 private: 2720 NativeCall* _call; 2721 2722 public: 2723 DirectNativeCallWrapper(NativeCall* call) : _call(call) {} 2724 2725 virtual address destination() const { return _call->destination(); } 2726 virtual address instruction_address() const { return _call->instruction_address(); } 2727 virtual address next_instruction_address() const { return _call->next_instruction_address(); } 2728 virtual address return_address() const { return _call->return_address(); } 2729 2730 virtual address get_resolve_call_stub(bool is_optimized) const { 2731 if (is_optimized) { 2732 return SharedRuntime::get_resolve_opt_virtual_call_stub(); 2733 } 2734 return SharedRuntime::get_resolve_virtual_call_stub(); 2735 } 2736 2737 virtual void set_destination_mt_safe(address dest) { 2738 #if INCLUDE_AOT 2739 if (UseAOT) { 2740 CodeBlob* callee = CodeCache::find_blob(dest); 2741 CompiledMethod* cm = callee->as_compiled_method_or_null(); 2742 if (cm != NULL && cm->is_far_code()) { 2743 // Temporary fix, see JDK-8143106 2744 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address()); 2745 csc->set_to_far(methodHandle(cm->method()), dest); 2746 return; 2747 } 2748 } 2749 #endif 2750 _call->set_destination_mt_safe(dest); 2751 } 2752 2753 virtual void set_to_interpreted(const methodHandle& method, CompiledICInfo& info) { 2754 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address()); 2755 #if INCLUDE_AOT 2756 if (info.to_aot()) { 2757 csc->set_to_far(method, info.entry()); 2758 } else 2759 #endif 2760 { 2761 csc->set_to_interpreted(method, info.entry()); 2762 } 2763 } 2764 2765 virtual void verify() const { 2766 // make sure code pattern is actually a call imm32 instruction 2767 _call->verify(); 2768 _call->verify_alignment(); 2769 } 2770 2771 virtual void verify_resolve_call(address dest) const { 2772 CodeBlob* db = CodeCache::find_blob_unsafe(dest); 2773 assert(db != NULL && !db->is_adapter_blob(), "must use stub!"); 2774 } 2775 2776 virtual bool is_call_to_interpreted(address dest) const { 2777 CodeBlob* cb = CodeCache::find_blob(_call->instruction_address()); 2778 return cb->contains(dest); 2779 } 2780 2781 virtual bool is_safe_for_patching() const { return false; } 2782 2783 virtual NativeInstruction* get_load_instruction(virtual_call_Relocation* r) const { 2784 return nativeMovConstReg_at(r->cached_value()); 2785 } 2786 2787 virtual void *get_data(NativeInstruction* instruction) const { 2788 return (void*)((NativeMovConstReg*) instruction)->data(); 2789 } 2790 2791 virtual void set_data(NativeInstruction* instruction, intptr_t data) { 2792 ((NativeMovConstReg*) instruction)->set_data(data); 2793 } 2794 }; 2795 2796 NativeCallWrapper* nmethod::call_wrapper_at(address call) const { 2797 return new DirectNativeCallWrapper((NativeCall*) call); 2798 } 2799 2800 NativeCallWrapper* nmethod::call_wrapper_before(address return_pc) const { 2801 return new DirectNativeCallWrapper(nativeCall_before(return_pc)); 2802 } 2803 2804 address nmethod::call_instruction_address(address pc) const { 2805 if (NativeCall::is_call_before(pc)) { 2806 NativeCall *ncall = nativeCall_before(pc); 2807 return ncall->instruction_address(); 2808 } 2809 return NULL; 2810 } 2811 2812 CompiledStaticCall* nmethod::compiledStaticCall_at(Relocation* call_site) const { 2813 return CompiledDirectStaticCall::at(call_site); 2814 } 2815 2816 CompiledStaticCall* nmethod::compiledStaticCall_at(address call_site) const { 2817 return CompiledDirectStaticCall::at(call_site); 2818 } 2819 2820 CompiledStaticCall* nmethod::compiledStaticCall_before(address return_addr) const { 2821 return CompiledDirectStaticCall::before(return_addr); 2822 } 2823 2824 #ifndef PRODUCT 2825 2826 void nmethod::print_value_on(outputStream* st) const { 2827 st->print("nmethod"); 2828 print_on(st, NULL); 2829 } 2830 2831 void nmethod::print_calls(outputStream* st) { 2832 RelocIterator iter(this); 2833 while (iter.next()) { 2834 switch (iter.type()) { 2835 case relocInfo::virtual_call_type: 2836 case relocInfo::opt_virtual_call_type: { 2837 CompiledICLocker ml_verify(this); 2838 CompiledIC_at(&iter)->print(); 2839 break; 2840 } 2841 case relocInfo::static_call_type: 2842 st->print_cr("Static call at " INTPTR_FORMAT, p2i(iter.reloc()->addr())); 2843 CompiledDirectStaticCall::at(iter.reloc())->print(); 2844 break; 2845 default: 2846 break; 2847 } 2848 } 2849 } 2850 2851 void nmethod::print_handler_table() { 2852 ExceptionHandlerTable(this).print(); 2853 } 2854 2855 void nmethod::print_nul_chk_table() { 2856 ImplicitExceptionTable(this).print(code_begin()); 2857 } 2858 2859 void nmethod::print_statistics() { 2860 ttyLocker ttyl; 2861 if (xtty != NULL) xtty->head("statistics type='nmethod'"); 2862 native_nmethod_stats.print_native_nmethod_stats(); 2863 #ifdef COMPILER1 2864 c1_java_nmethod_stats.print_nmethod_stats("C1"); 2865 #endif 2866 #ifdef COMPILER2 2867 c2_java_nmethod_stats.print_nmethod_stats("C2"); 2868 #endif 2869 #if INCLUDE_JVMCI 2870 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI"); 2871 #endif 2872 unknown_java_nmethod_stats.print_nmethod_stats("Unknown"); 2873 DebugInformationRecorder::print_statistics(); 2874 #ifndef PRODUCT 2875 pc_nmethod_stats.print_pc_stats(); 2876 #endif 2877 Dependencies::print_statistics(); 2878 if (xtty != NULL) xtty->tail("statistics"); 2879 } 2880 2881 #endif // !PRODUCT 2882 2883 #if INCLUDE_JVMCI 2884 void nmethod::clear_jvmci_installed_code() { 2885 assert_locked_or_safepoint(Patching_lock); 2886 if (_jvmci_installed_code != NULL) { 2887 JNIHandles::destroy_weak_global(_jvmci_installed_code); 2888 _jvmci_installed_code = NULL; 2889 } 2890 } 2891 2892 void nmethod::clear_speculation_log() { 2893 assert_locked_or_safepoint(Patching_lock); 2894 if (_speculation_log != NULL) { 2895 JNIHandles::destroy_weak_global(_speculation_log); 2896 _speculation_log = NULL; 2897 } 2898 } 2899 2900 void nmethod::maybe_invalidate_installed_code() { 2901 if (!is_compiled_by_jvmci()) { 2902 return; 2903 } 2904 2905 assert(Patching_lock->is_locked() || 2906 SafepointSynchronize::is_at_safepoint(), "should be performed under a lock for consistency"); 2907 oop installed_code = JNIHandles::resolve(_jvmci_installed_code); 2908 if (installed_code != NULL) { 2909 // Update the values in the InstalledCode instance if it still refers to this nmethod 2910 nmethod* nm = (nmethod*)InstalledCode::address(installed_code); 2911 if (nm == this) { 2912 if (!is_alive() || is_unloading()) { 2913 // Break the link between nmethod and InstalledCode such that the nmethod 2914 // can subsequently be flushed safely. The link must be maintained while 2915 // the method could have live activations since invalidateInstalledCode 2916 // might want to invalidate all existing activations. 2917 InstalledCode::set_address(installed_code, 0); 2918 InstalledCode::set_entryPoint(installed_code, 0); 2919 } else if (is_not_entrant()) { 2920 // Remove the entry point so any invocation will fail but keep 2921 // the address link around that so that existing activations can 2922 // be invalidated. 2923 InstalledCode::set_entryPoint(installed_code, 0); 2924 } 2925 } 2926 } 2927 if (!is_alive() || is_unloading()) { 2928 // Clear these out after the nmethod has been unregistered and any 2929 // updates to the InstalledCode instance have been performed. 2930 clear_jvmci_installed_code(); 2931 clear_speculation_log(); 2932 } 2933 } 2934 2935 void nmethod::invalidate_installed_code(Handle installedCode, TRAPS) { 2936 if (installedCode() == NULL) { 2937 THROW(vmSymbols::java_lang_NullPointerException()); 2938 } 2939 jlong nativeMethod = InstalledCode::address(installedCode); 2940 nmethod* nm = (nmethod*)nativeMethod; 2941 if (nm == NULL) { 2942 // Nothing to do 2943 return; 2944 } 2945 2946 nmethodLocker nml(nm); 2947 #ifdef ASSERT 2948 { 2949 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 2950 // This relationship can only be checked safely under a lock 2951 assert(!nm->is_alive() || nm->is_unloading() || nm->jvmci_installed_code() == installedCode(), "sanity check"); 2952 } 2953 #endif 2954 2955 if (nm->is_alive()) { 2956 // Invalidating the InstalledCode means we want the nmethod 2957 // to be deoptimized. 2958 nm->mark_for_deoptimization(); 2959 VM_Deoptimize op; 2960 VMThread::execute(&op); 2961 } 2962 2963 // Multiple threads could reach this point so we now need to 2964 // lock and re-check the link to the nmethod so that only one 2965 // thread clears it. 2966 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 2967 if (InstalledCode::address(installedCode) == nativeMethod) { 2968 InstalledCode::set_address(installedCode, 0); 2969 } 2970 } 2971 2972 oop nmethod::jvmci_installed_code() { 2973 return JNIHandles::resolve(_jvmci_installed_code); 2974 } 2975 2976 oop nmethod::speculation_log() { 2977 return JNIHandles::resolve(_speculation_log); 2978 } 2979 2980 char* nmethod::jvmci_installed_code_name(char* buf, size_t buflen) const { 2981 if (!this->is_compiled_by_jvmci()) { 2982 return NULL; 2983 } 2984 oop installed_code = JNIHandles::resolve(_jvmci_installed_code); 2985 if (installed_code != NULL) { 2986 oop installed_code_name = NULL; 2987 if (installed_code->is_a(InstalledCode::klass())) { 2988 installed_code_name = InstalledCode::name(installed_code); 2989 } 2990 if (installed_code_name != NULL) { 2991 return java_lang_String::as_utf8_string(installed_code_name, buf, (int)buflen); 2992 } 2993 } 2994 return NULL; 2995 } 2996 #endif