1 /* 2 * Copyright (c) 1997, 2016, 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 "code/codeCache.hpp" 27 #include "code/compiledIC.hpp" 28 #include "code/dependencies.hpp" 29 #include "code/nativeInst.hpp" 30 #include "code/nmethod.hpp" 31 #include "code/scopeDesc.hpp" 32 #include "compiler/abstractCompiler.hpp" 33 #include "compiler/compileBroker.hpp" 34 #include "compiler/compileLog.hpp" 35 #include "compiler/compilerDirectives.hpp" 36 #include "compiler/directivesParser.hpp" 37 #include "compiler/disassembler.hpp" 38 #include "interpreter/bytecode.hpp" 39 #include "logging/log.hpp" 40 #include "memory/resourceArea.hpp" 41 #include "oops/methodData.hpp" 42 #include "oops/oop.inline.hpp" 43 #include "prims/jvmtiImpl.hpp" 44 #include "runtime/atomic.hpp" 45 #include "runtime/orderAccess.inline.hpp" 46 #include "runtime/os.hpp" 47 #include "runtime/sharedRuntime.hpp" 48 #include "runtime/sweeper.hpp" 49 #include "utilities/resourceHash.hpp" 50 #include "utilities/dtrace.hpp" 51 #include "utilities/events.hpp" 52 #include "utilities/xmlstream.hpp" 53 #include "logging/log.hpp" 54 #ifdef SHARK 55 #include "shark/sharkCompiler.hpp" 56 #endif 57 #if INCLUDE_JVMCI 58 #include "jvmci/jvmciJavaClasses.hpp" 59 #endif 60 61 #ifdef DTRACE_ENABLED 62 63 // Only bother with this argument setup if dtrace is available 64 65 #define DTRACE_METHOD_UNLOAD_PROBE(method) \ 66 { \ 67 Method* m = (method); \ 68 if (m != NULL) { \ 69 Symbol* klass_name = m->klass_name(); \ 70 Symbol* name = m->name(); \ 71 Symbol* signature = m->signature(); \ 72 HOTSPOT_COMPILED_METHOD_UNLOAD( \ 73 (char *) klass_name->bytes(), klass_name->utf8_length(), \ 74 (char *) name->bytes(), name->utf8_length(), \ 75 (char *) signature->bytes(), signature->utf8_length()); \ 76 } \ 77 } 78 79 #else // ndef DTRACE_ENABLED 80 81 #define DTRACE_METHOD_UNLOAD_PROBE(method) 82 83 #endif 84 85 //--------------------------------------------------------------------------------- 86 // NMethod statistics 87 // They are printed under various flags, including: 88 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation. 89 // (In the latter two cases, they like other stats are printed to the log only.) 90 91 #ifndef PRODUCT 92 // These variables are put into one block to reduce relocations 93 // and make it simpler to print from the debugger. 94 struct java_nmethod_stats_struct { 95 int nmethod_count; 96 int total_size; 97 int relocation_size; 98 int consts_size; 99 int insts_size; 100 int stub_size; 101 int scopes_data_size; 102 int scopes_pcs_size; 103 int dependencies_size; 104 int handler_table_size; 105 int nul_chk_table_size; 106 int oops_size; 107 int metadata_size; 108 109 void note_nmethod(nmethod* nm) { 110 nmethod_count += 1; 111 total_size += nm->size(); 112 relocation_size += nm->relocation_size(); 113 consts_size += nm->consts_size(); 114 insts_size += nm->insts_size(); 115 stub_size += nm->stub_size(); 116 oops_size += nm->oops_size(); 117 metadata_size += nm->metadata_size(); 118 scopes_data_size += nm->scopes_data_size(); 119 scopes_pcs_size += nm->scopes_pcs_size(); 120 dependencies_size += nm->dependencies_size(); 121 handler_table_size += nm->handler_table_size(); 122 nul_chk_table_size += nm->nul_chk_table_size(); 123 } 124 void print_nmethod_stats(const char* name) { 125 if (nmethod_count == 0) return; 126 tty->print_cr("Statistics for %d bytecoded nmethods for %s:", nmethod_count, name); 127 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size); 128 if (nmethod_count != 0) tty->print_cr(" header = " SIZE_FORMAT, nmethod_count * sizeof(nmethod)); 129 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size); 130 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size); 131 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size); 132 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size); 133 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size); 134 if (metadata_size != 0) tty->print_cr(" metadata = %d", metadata_size); 135 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size); 136 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size); 137 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size); 138 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size); 139 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size); 140 } 141 }; 142 143 struct native_nmethod_stats_struct { 144 int native_nmethod_count; 145 int native_total_size; 146 int native_relocation_size; 147 int native_insts_size; 148 int native_oops_size; 149 int native_metadata_size; 150 void note_native_nmethod(nmethod* nm) { 151 native_nmethod_count += 1; 152 native_total_size += nm->size(); 153 native_relocation_size += nm->relocation_size(); 154 native_insts_size += nm->insts_size(); 155 native_oops_size += nm->oops_size(); 156 native_metadata_size += nm->metadata_size(); 157 } 158 void print_native_nmethod_stats() { 159 if (native_nmethod_count == 0) return; 160 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count); 161 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size); 162 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size); 163 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size); 164 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size); 165 if (native_metadata_size != 0) tty->print_cr(" N. metadata = %d", native_metadata_size); 166 } 167 }; 168 169 struct pc_nmethod_stats_struct { 170 int pc_desc_resets; // number of resets (= number of caches) 171 int pc_desc_queries; // queries to nmethod::find_pc_desc 172 int pc_desc_approx; // number of those which have approximate true 173 int pc_desc_repeats; // number of _pc_descs[0] hits 174 int pc_desc_hits; // number of LRU cache hits 175 int pc_desc_tests; // total number of PcDesc examinations 176 int pc_desc_searches; // total number of quasi-binary search steps 177 int pc_desc_adds; // number of LUR cache insertions 178 179 void print_pc_stats() { 180 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query", 181 pc_desc_queries, 182 (double)(pc_desc_tests + pc_desc_searches) 183 / pc_desc_queries); 184 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d", 185 pc_desc_resets, 186 pc_desc_queries, pc_desc_approx, 187 pc_desc_repeats, pc_desc_hits, 188 pc_desc_tests, pc_desc_searches, pc_desc_adds); 189 } 190 }; 191 192 #ifdef COMPILER1 193 static java_nmethod_stats_struct c1_java_nmethod_stats; 194 #endif 195 #ifdef COMPILER2 196 static java_nmethod_stats_struct c2_java_nmethod_stats; 197 #endif 198 #if INCLUDE_JVMCI 199 static java_nmethod_stats_struct jvmci_java_nmethod_stats; 200 #endif 201 #ifdef SHARK 202 static java_nmethod_stats_struct shark_java_nmethod_stats; 203 #endif 204 static java_nmethod_stats_struct unknown_java_nmethod_stats; 205 206 static native_nmethod_stats_struct native_nmethod_stats; 207 static pc_nmethod_stats_struct pc_nmethod_stats; 208 209 static void note_java_nmethod(nmethod* nm) { 210 #ifdef COMPILER1 211 if (nm->is_compiled_by_c1()) { 212 c1_java_nmethod_stats.note_nmethod(nm); 213 } else 214 #endif 215 #ifdef COMPILER2 216 if (nm->is_compiled_by_c2()) { 217 c2_java_nmethod_stats.note_nmethod(nm); 218 } else 219 #endif 220 #if INCLUDE_JVMCI 221 if (nm->is_compiled_by_jvmci()) { 222 jvmci_java_nmethod_stats.note_nmethod(nm); 223 } else 224 #endif 225 #ifdef SHARK 226 if (nm->is_compiled_by_shark()) { 227 shark_java_nmethod_stats.note_nmethod(nm); 228 } else 229 #endif 230 { 231 unknown_java_nmethod_stats.note_nmethod(nm); 232 } 233 } 234 #endif // !PRODUCT 235 236 //--------------------------------------------------------------------------------- 237 238 239 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) { 240 assert(pc != NULL, "Must be non null"); 241 assert(exception.not_null(), "Must be non null"); 242 assert(handler != NULL, "Must be non null"); 243 244 _count = 0; 245 _exception_type = exception->klass(); 246 _next = NULL; 247 248 add_address_and_handler(pc,handler); 249 } 250 251 252 address ExceptionCache::match(Handle exception, address pc) { 253 assert(pc != NULL,"Must be non null"); 254 assert(exception.not_null(),"Must be non null"); 255 if (exception->klass() == exception_type()) { 256 return (test_address(pc)); 257 } 258 259 return NULL; 260 } 261 262 263 bool ExceptionCache::match_exception_with_space(Handle exception) { 264 assert(exception.not_null(),"Must be non null"); 265 if (exception->klass() == exception_type() && count() < cache_size) { 266 return true; 267 } 268 return false; 269 } 270 271 272 address ExceptionCache::test_address(address addr) { 273 int limit = count(); 274 for (int i = 0; i < limit; i++) { 275 if (pc_at(i) == addr) { 276 return handler_at(i); 277 } 278 } 279 return NULL; 280 } 281 282 283 bool ExceptionCache::add_address_and_handler(address addr, address handler) { 284 if (test_address(addr) == handler) return true; 285 286 int index = count(); 287 if (index < cache_size) { 288 set_pc_at(index, addr); 289 set_handler_at(index, handler); 290 increment_count(); 291 return true; 292 } 293 return false; 294 } 295 296 //----------------------------------------------------------------------------- 297 298 299 // Helper used by both find_pc_desc methods. 300 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) { 301 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_tests); 302 if (!approximate) 303 return pc->pc_offset() == pc_offset; 304 else 305 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset(); 306 } 307 308 void PcDescCache::reset_to(PcDesc* initial_pc_desc) { 309 if (initial_pc_desc == NULL) { 310 _pc_descs[0] = NULL; // native method; no PcDescs at all 311 return; 312 } 313 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_resets); 314 // reset the cache by filling it with benign (non-null) values 315 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel"); 316 for (int i = 0; i < cache_size; i++) 317 _pc_descs[i] = initial_pc_desc; 318 } 319 320 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) { 321 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_queries); 322 NOT_PRODUCT(if (approximate) ++pc_nmethod_stats.pc_desc_approx); 323 324 // Note: one might think that caching the most recently 325 // read value separately would be a win, but one would be 326 // wrong. When many threads are updating it, the cache 327 // line it's in would bounce between caches, negating 328 // any benefit. 329 330 // In order to prevent race conditions do not load cache elements 331 // repeatedly, but use a local copy: 332 PcDesc* res; 333 334 // Step one: Check the most recently added value. 335 res = _pc_descs[0]; 336 if (res == NULL) return NULL; // native method; no PcDescs at all 337 if (match_desc(res, pc_offset, approximate)) { 338 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_repeats); 339 return res; 340 } 341 342 // Step two: Check the rest of the LRU cache. 343 for (int i = 1; i < cache_size; ++i) { 344 res = _pc_descs[i]; 345 if (res->pc_offset() < 0) break; // optimization: skip empty cache 346 if (match_desc(res, pc_offset, approximate)) { 347 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_hits); 348 return res; 349 } 350 } 351 352 // Report failure. 353 return NULL; 354 } 355 356 void PcDescCache::add_pc_desc(PcDesc* pc_desc) { 357 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_adds); 358 // Update the LRU cache by shifting pc_desc forward. 359 for (int i = 0; i < cache_size; i++) { 360 PcDesc* next = _pc_descs[i]; 361 _pc_descs[i] = pc_desc; 362 pc_desc = next; 363 } 364 } 365 366 // adjust pcs_size so that it is a multiple of both oopSize and 367 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple 368 // of oopSize, then 2*sizeof(PcDesc) is) 369 static int adjust_pcs_size(int pcs_size) { 370 int nsize = round_to(pcs_size, oopSize); 371 if ((nsize % sizeof(PcDesc)) != 0) { 372 nsize = pcs_size + sizeof(PcDesc); 373 } 374 assert((nsize % oopSize) == 0, "correct alignment"); 375 return nsize; 376 } 377 378 379 int nmethod::total_size() const { 380 return 381 consts_size() + 382 insts_size() + 383 stub_size() + 384 scopes_data_size() + 385 scopes_pcs_size() + 386 handler_table_size() + 387 nul_chk_table_size(); 388 } 389 390 const char* nmethod::compile_kind() const { 391 if (is_osr_method()) return "osr"; 392 if (method() != NULL && is_native_method()) return "c2n"; 393 return NULL; 394 } 395 396 // Fill in default values for various flag fields 397 void nmethod::init_defaults() { 398 _state = in_use; 399 _has_flushed_dependencies = 0; 400 _lock_count = 0; 401 _stack_traversal_mark = 0; 402 _unload_reported = false; // jvmti state 403 _is_far_code = false; // nmethods are located in CodeCache 404 405 #ifdef ASSERT 406 _oops_are_stale = false; 407 #endif 408 409 _oops_do_mark_link = NULL; 410 _jmethod_id = NULL; 411 _osr_link = NULL; 412 if (UseG1GC) { 413 _unloading_next = NULL; 414 } else { 415 _scavenge_root_link = NULL; 416 } 417 _scavenge_root_state = 0; 418 #if INCLUDE_RTM_OPT 419 _rtm_state = NoRTM; 420 #endif 421 #if INCLUDE_JVMCI 422 _jvmci_installed_code = NULL; 423 _speculation_log = NULL; 424 #endif 425 } 426 427 nmethod* nmethod::new_native_nmethod(const methodHandle& method, 428 int compile_id, 429 CodeBuffer *code_buffer, 430 int vep_offset, 431 int frame_complete, 432 int frame_size, 433 ByteSize basic_lock_owner_sp_offset, 434 ByteSize basic_lock_sp_offset, 435 OopMapSet* oop_maps) { 436 code_buffer->finalize_oop_references(method); 437 // create nmethod 438 nmethod* nm = NULL; 439 { 440 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 441 int native_nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod)); 442 CodeOffsets offsets; 443 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset); 444 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete); 445 nm = new (native_nmethod_size, CompLevel_none) nmethod(method(), compiler_none, native_nmethod_size, 446 compile_id, &offsets, 447 code_buffer, frame_size, 448 basic_lock_owner_sp_offset, 449 basic_lock_sp_offset, oop_maps); 450 NOT_PRODUCT(if (nm != NULL) native_nmethod_stats.note_native_nmethod(nm)); 451 } 452 // verify nmethod 453 debug_only(if (nm) nm->verify();) // might block 454 455 if (nm != NULL) { 456 nm->log_new_nmethod(); 457 } 458 459 return nm; 460 } 461 462 nmethod* nmethod::new_nmethod(const methodHandle& method, 463 int compile_id, 464 int entry_bci, 465 CodeOffsets* offsets, 466 int orig_pc_offset, 467 DebugInformationRecorder* debug_info, 468 Dependencies* dependencies, 469 CodeBuffer* code_buffer, int frame_size, 470 OopMapSet* oop_maps, 471 ExceptionHandlerTable* handler_table, 472 ImplicitExceptionTable* nul_chk_table, 473 AbstractCompiler* compiler, 474 int comp_level 475 #if INCLUDE_JVMCI 476 , Handle installed_code, 477 Handle speculationLog 478 #endif 479 ) 480 { 481 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); 482 code_buffer->finalize_oop_references(method); 483 // create nmethod 484 nmethod* nm = NULL; 485 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 486 int nmethod_size = 487 CodeBlob::allocation_size(code_buffer, sizeof(nmethod)) 488 + adjust_pcs_size(debug_info->pcs_size()) 489 + round_to(dependencies->size_in_bytes() , oopSize) 490 + round_to(handler_table->size_in_bytes(), oopSize) 491 + round_to(nul_chk_table->size_in_bytes(), oopSize) 492 + round_to(debug_info->data_size() , oopSize); 493 494 nm = new (nmethod_size, comp_level) 495 nmethod(method(), compiler->type(), nmethod_size, compile_id, entry_bci, offsets, 496 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size, 497 oop_maps, 498 handler_table, 499 nul_chk_table, 500 compiler, 501 comp_level 502 #if INCLUDE_JVMCI 503 , installed_code, 504 speculationLog 505 #endif 506 ); 507 508 if (nm != NULL) { 509 // To make dependency checking during class loading fast, record 510 // the nmethod dependencies in the classes it is dependent on. 511 // This allows the dependency checking code to simply walk the 512 // class hierarchy above the loaded class, checking only nmethods 513 // which are dependent on those classes. The slow way is to 514 // check every nmethod for dependencies which makes it linear in 515 // the number of methods compiled. For applications with a lot 516 // classes the slow way is too slow. 517 for (Dependencies::DepStream deps(nm); deps.next(); ) { 518 if (deps.type() == Dependencies::call_site_target_value) { 519 // CallSite dependencies are managed on per-CallSite instance basis. 520 oop call_site = deps.argument_oop(0); 521 MethodHandles::add_dependent_nmethod(call_site, nm); 522 } else { 523 Klass* klass = deps.context_type(); 524 if (klass == NULL) { 525 continue; // ignore things like evol_method 526 } 527 // record this nmethod as dependent on this klass 528 InstanceKlass::cast(klass)->add_dependent_nmethod(nm); 529 } 530 } 531 NOT_PRODUCT(if (nm != NULL) note_java_nmethod(nm)); 532 } 533 } 534 // Do verification and logging outside CodeCache_lock. 535 if (nm != NULL) { 536 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet. 537 DEBUG_ONLY(nm->verify();) 538 nm->log_new_nmethod(); 539 } 540 return nm; 541 } 542 543 // For native wrappers 544 nmethod::nmethod( 545 Method* method, 546 CompilerType type, 547 int nmethod_size, 548 int compile_id, 549 CodeOffsets* offsets, 550 CodeBuffer* code_buffer, 551 int frame_size, 552 ByteSize basic_lock_owner_sp_offset, 553 ByteSize basic_lock_sp_offset, 554 OopMapSet* oop_maps ) 555 : CompiledMethod(method, "native nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false), 556 _native_receiver_sp_offset(basic_lock_owner_sp_offset), 557 _native_basic_lock_sp_offset(basic_lock_sp_offset) 558 { 559 { 560 int scopes_data_offset = 0; 561 int deoptimize_offset = 0; 562 int deoptimize_mh_offset = 0; 563 564 debug_only(NoSafepointVerifier nsv;) 565 assert_locked_or_safepoint(CodeCache_lock); 566 567 init_defaults(); 568 _entry_bci = InvocationEntryBci; 569 // We have no exception handler or deopt handler make the 570 // values something that will never match a pc like the nmethod vtable entry 571 _exception_offset = 0; 572 _orig_pc_offset = 0; 573 574 _consts_offset = data_offset(); 575 _stub_offset = data_offset(); 576 _oops_offset = data_offset(); 577 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize); 578 scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize); 579 _scopes_pcs_offset = scopes_data_offset; 580 _dependencies_offset = _scopes_pcs_offset; 581 _handler_table_offset = _dependencies_offset; 582 _nul_chk_table_offset = _handler_table_offset; 583 _nmethod_end_offset = _nul_chk_table_offset; 584 _compile_id = compile_id; 585 _comp_level = CompLevel_none; 586 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 587 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 588 _osr_entry_point = NULL; 589 _exception_cache = NULL; 590 _pc_desc_container.reset_to(NULL); 591 _hotness_counter = NMethodSweeper::hotness_counter_reset_val(); 592 593 _scopes_data_begin = (address) this + scopes_data_offset; 594 _deopt_handler_begin = (address) this + deoptimize_offset; 595 _deopt_mh_handler_begin = (address) this + deoptimize_mh_offset; 596 597 code_buffer->copy_code_and_locs_to(this); 598 code_buffer->copy_values_to(this); 599 if (ScavengeRootsInCode) { 600 if (detect_scavenge_root_oops()) { 601 CodeCache::add_scavenge_root_nmethod(this); 602 } 603 Universe::heap()->register_nmethod(this); 604 } 605 debug_only(verify_scavenge_root_oops()); 606 CodeCache::commit(this); 607 } 608 609 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) { 610 ttyLocker ttyl; // keep the following output all in one block 611 // This output goes directly to the tty, not the compiler log. 612 // To enable tools to match it up with the compilation activity, 613 // be sure to tag this tty output with the compile ID. 614 if (xtty != NULL) { 615 xtty->begin_head("print_native_nmethod"); 616 xtty->method(_method); 617 xtty->stamp(); 618 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this); 619 } 620 // print the header part first 621 print(); 622 // then print the requested information 623 if (PrintNativeNMethods) { 624 print_code(); 625 if (oop_maps != NULL) { 626 oop_maps->print(); 627 } 628 } 629 if (PrintRelocations) { 630 print_relocations(); 631 } 632 if (xtty != NULL) { 633 xtty->tail("print_native_nmethod"); 634 } 635 } 636 } 637 638 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () { 639 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level)); 640 } 641 642 nmethod::nmethod( 643 Method* method, 644 CompilerType type, 645 int nmethod_size, 646 int compile_id, 647 int entry_bci, 648 CodeOffsets* offsets, 649 int orig_pc_offset, 650 DebugInformationRecorder* debug_info, 651 Dependencies* dependencies, 652 CodeBuffer *code_buffer, 653 int frame_size, 654 OopMapSet* oop_maps, 655 ExceptionHandlerTable* handler_table, 656 ImplicitExceptionTable* nul_chk_table, 657 AbstractCompiler* compiler, 658 int comp_level 659 #if INCLUDE_JVMCI 660 , Handle installed_code, 661 Handle speculation_log 662 #endif 663 ) 664 : CompiledMethod(method, "nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false), 665 _native_receiver_sp_offset(in_ByteSize(-1)), 666 _native_basic_lock_sp_offset(in_ByteSize(-1)) 667 { 668 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); 669 { 670 debug_only(NoSafepointVerifier nsv;) 671 assert_locked_or_safepoint(CodeCache_lock); 672 673 _deopt_handler_begin = (address) this; 674 _deopt_mh_handler_begin = (address) this; 675 676 init_defaults(); 677 _entry_bci = entry_bci; 678 _compile_id = compile_id; 679 _comp_level = comp_level; 680 _orig_pc_offset = orig_pc_offset; 681 _hotness_counter = NMethodSweeper::hotness_counter_reset_val(); 682 683 // Section offsets 684 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts()); 685 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs()); 686 set_ctable_begin(header_begin() + _consts_offset); 687 688 #if INCLUDE_JVMCI 689 _jvmci_installed_code = installed_code(); 690 _speculation_log = (instanceOop)speculation_log(); 691 692 if (compiler->is_jvmci()) { 693 // JVMCI might not produce any stub sections 694 if (offsets->value(CodeOffsets::Exceptions) != -1) { 695 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions); 696 } else { 697 _exception_offset = -1; 698 } 699 if (offsets->value(CodeOffsets::Deopt) != -1) { 700 _deopt_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::Deopt); 701 } else { 702 _deopt_handler_begin = NULL; 703 } 704 if (offsets->value(CodeOffsets::DeoptMH) != -1) { 705 _deopt_mh_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::DeoptMH); 706 } else { 707 _deopt_mh_handler_begin = NULL; 708 } 709 } else { 710 #endif 711 // Exception handler and deopt handler are in the stub section 712 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set"); 713 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set"); 714 715 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions); 716 _deopt_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::Deopt); 717 if (offsets->value(CodeOffsets::DeoptMH) != -1) { 718 _deopt_mh_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::DeoptMH); 719 } else { 720 _deopt_mh_handler_begin = NULL; 721 #if INCLUDE_JVMCI 722 } 723 #endif 724 } 725 if (offsets->value(CodeOffsets::UnwindHandler) != -1) { 726 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler); 727 } else { 728 _unwind_handler_offset = -1; 729 } 730 731 _oops_offset = data_offset(); 732 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize); 733 int scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize); 734 735 _scopes_pcs_offset = scopes_data_offset + round_to(debug_info->data_size (), oopSize); 736 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size()); 737 _handler_table_offset = _dependencies_offset + round_to(dependencies->size_in_bytes (), oopSize); 738 _nul_chk_table_offset = _handler_table_offset + round_to(handler_table->size_in_bytes(), oopSize); 739 _nmethod_end_offset = _nul_chk_table_offset + round_to(nul_chk_table->size_in_bytes(), oopSize); 740 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 741 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 742 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry); 743 _exception_cache = NULL; 744 745 _scopes_data_begin = (address) this + scopes_data_offset; 746 747 _pc_desc_container.reset_to(scopes_pcs_begin()); 748 749 code_buffer->copy_code_and_locs_to(this); 750 // Copy contents of ScopeDescRecorder to nmethod 751 code_buffer->copy_values_to(this); 752 debug_info->copy_to(this); 753 dependencies->copy_to(this); 754 if (ScavengeRootsInCode) { 755 if (detect_scavenge_root_oops()) { 756 CodeCache::add_scavenge_root_nmethod(this); 757 } 758 Universe::heap()->register_nmethod(this); 759 } 760 debug_only(verify_scavenge_root_oops()); 761 762 CodeCache::commit(this); 763 764 // Copy contents of ExceptionHandlerTable to nmethod 765 handler_table->copy_to(this); 766 nul_chk_table->copy_to(this); 767 768 // we use the information of entry points to find out if a method is 769 // static or non static 770 assert(compiler->is_c2() || compiler->is_jvmci() || 771 _method->is_static() == (entry_point() == _verified_entry_point), 772 " entry points must be same for static methods and vice versa"); 773 } 774 } 775 776 // Print a short set of xml attributes to identify this nmethod. The 777 // output should be embedded in some other element. 778 void nmethod::log_identity(xmlStream* log) const { 779 log->print(" compile_id='%d'", compile_id()); 780 const char* nm_kind = compile_kind(); 781 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind); 782 log->print(" compiler='%s'", compiler_name()); 783 if (TieredCompilation) { 784 log->print(" level='%d'", comp_level()); 785 } 786 } 787 788 789 #define LOG_OFFSET(log, name) \ 790 if (p2i(name##_end()) - p2i(name##_begin())) \ 791 log->print(" " XSTR(name) "_offset='" INTX_FORMAT "'" , \ 792 p2i(name##_begin()) - p2i(this)) 793 794 795 void nmethod::log_new_nmethod() const { 796 if (LogCompilation && xtty != NULL) { 797 ttyLocker ttyl; 798 HandleMark hm; 799 xtty->begin_elem("nmethod"); 800 log_identity(xtty); 801 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size()); 802 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this)); 803 804 LOG_OFFSET(xtty, relocation); 805 LOG_OFFSET(xtty, consts); 806 LOG_OFFSET(xtty, insts); 807 LOG_OFFSET(xtty, stub); 808 LOG_OFFSET(xtty, scopes_data); 809 LOG_OFFSET(xtty, scopes_pcs); 810 LOG_OFFSET(xtty, dependencies); 811 LOG_OFFSET(xtty, handler_table); 812 LOG_OFFSET(xtty, nul_chk_table); 813 LOG_OFFSET(xtty, oops); 814 LOG_OFFSET(xtty, metadata); 815 816 xtty->method(method()); 817 xtty->stamp(); 818 xtty->end_elem(); 819 } 820 } 821 822 #undef LOG_OFFSET 823 824 825 // Print out more verbose output usually for a newly created nmethod. 826 void nmethod::print_on(outputStream* st, const char* msg) const { 827 if (st != NULL) { 828 ttyLocker ttyl; 829 if (WizardMode) { 830 CompileTask::print(st, this, msg, /*short_form:*/ true); 831 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this)); 832 } else { 833 CompileTask::print(st, this, msg, /*short_form:*/ false); 834 } 835 } 836 } 837 838 void nmethod::maybe_print_nmethod(DirectiveSet* directive) { 839 bool printnmethods = directive->PrintAssemblyOption || directive->PrintNMethodsOption; 840 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) { 841 print_nmethod(printnmethods); 842 } 843 } 844 845 void nmethod::print_nmethod(bool printmethod) { 846 ttyLocker ttyl; // keep the following output all in one block 847 if (xtty != NULL) { 848 xtty->begin_head("print_nmethod"); 849 xtty->stamp(); 850 xtty->end_head(); 851 } 852 // print the header part first 853 print(); 854 // then print the requested information 855 if (printmethod) { 856 print_code(); 857 print_pcs(); 858 if (oop_maps()) { 859 oop_maps()->print(); 860 } 861 } 862 if (printmethod || PrintDebugInfo || CompilerOracle::has_option_string(_method, "PrintDebugInfo")) { 863 print_scopes(); 864 } 865 if (printmethod || PrintRelocations || CompilerOracle::has_option_string(_method, "PrintRelocations")) { 866 print_relocations(); 867 } 868 if (printmethod || PrintDependencies || CompilerOracle::has_option_string(_method, "PrintDependencies")) { 869 print_dependencies(); 870 } 871 if (printmethod || PrintExceptionHandlers) { 872 print_handler_table(); 873 print_nul_chk_table(); 874 } 875 if (printmethod) { 876 print_recorded_oops(); 877 print_recorded_metadata(); 878 } 879 if (xtty != NULL) { 880 xtty->tail("print_nmethod"); 881 } 882 } 883 884 885 // Promote one word from an assembly-time handle to a live embedded oop. 886 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) { 887 if (handle == NULL || 888 // As a special case, IC oops are initialized to 1 or -1. 889 handle == (jobject) Universe::non_oop_word()) { 890 (*dest) = (oop) handle; 891 } else { 892 (*dest) = JNIHandles::resolve_non_null(handle); 893 } 894 } 895 896 897 // Have to have the same name because it's called by a template 898 void nmethod::copy_values(GrowableArray<jobject>* array) { 899 int length = array->length(); 900 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough"); 901 oop* dest = oops_begin(); 902 for (int index = 0 ; index < length; index++) { 903 initialize_immediate_oop(&dest[index], array->at(index)); 904 } 905 906 // Now we can fix up all the oops in the code. We need to do this 907 // in the code because the assembler uses jobjects as placeholders. 908 // The code and relocations have already been initialized by the 909 // CodeBlob constructor, so it is valid even at this early point to 910 // iterate over relocations and patch the code. 911 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true); 912 } 913 914 void nmethod::copy_values(GrowableArray<Metadata*>* array) { 915 int length = array->length(); 916 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough"); 917 Metadata** dest = metadata_begin(); 918 for (int index = 0 ; index < length; index++) { 919 dest[index] = array->at(index); 920 } 921 } 922 923 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) { 924 // re-patch all oop-bearing instructions, just in case some oops moved 925 RelocIterator iter(this, begin, end); 926 while (iter.next()) { 927 if (iter.type() == relocInfo::oop_type) { 928 oop_Relocation* reloc = iter.oop_reloc(); 929 if (initialize_immediates && reloc->oop_is_immediate()) { 930 oop* dest = reloc->oop_addr(); 931 initialize_immediate_oop(dest, (jobject) *dest); 932 } 933 // Refresh the oop-related bits of this instruction. 934 reloc->fix_oop_relocation(); 935 } else if (iter.type() == relocInfo::metadata_type) { 936 metadata_Relocation* reloc = iter.metadata_reloc(); 937 reloc->fix_metadata_relocation(); 938 } 939 } 940 } 941 942 943 void nmethod::verify_clean_inline_caches() { 944 assert_locked_or_safepoint(CompiledIC_lock); 945 946 // If the method is not entrant or zombie then a JMP is plastered over the 947 // first few bytes. If an oop in the old code was there, that oop 948 // should not get GC'd. Skip the first few bytes of oops on 949 // not-entrant methods. 950 address low_boundary = verified_entry_point(); 951 if (!is_in_use()) { 952 low_boundary += NativeJump::instruction_size; 953 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 954 // This means that the low_boundary is going to be a little too high. 955 // This shouldn't matter, since oops of non-entrant methods are never used. 956 // In fact, why are we bothering to look at oops in a non-entrant method?? 957 } 958 959 ResourceMark rm; 960 RelocIterator iter(this, low_boundary); 961 while(iter.next()) { 962 switch(iter.type()) { 963 case relocInfo::virtual_call_type: 964 case relocInfo::opt_virtual_call_type: { 965 CompiledIC *ic = CompiledIC_at(&iter); 966 // Ok, to lookup references to zombies here 967 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination()); 968 nmethod* nm = cb->as_nmethod_or_null(); 969 if( nm != NULL ) { 970 // Verify that inline caches pointing to both zombie and not_entrant methods are clean 971 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 972 assert(ic->is_clean(), "IC should be clean"); 973 } 974 } 975 break; 976 } 977 case relocInfo::static_call_type: { 978 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc()); 979 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination()); 980 nmethod* nm = cb->as_nmethod_or_null(); 981 if( nm != NULL ) { 982 // Verify that inline caches pointing to both zombie and not_entrant methods are clean 983 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 984 assert(csc->is_clean(), "IC should be clean"); 985 } 986 } 987 break; 988 } 989 } 990 } 991 } 992 993 // This is a private interface with the sweeper. 994 void nmethod::mark_as_seen_on_stack() { 995 assert(is_alive(), "Must be an alive method"); 996 // Set the traversal mark to ensure that the sweeper does 2 997 // cleaning passes before moving to zombie. 998 set_stack_traversal_mark(NMethodSweeper::traversal_count()); 999 } 1000 1001 // Tell if a non-entrant method can be converted to a zombie (i.e., 1002 // there are no activations on the stack, not in use by the VM, 1003 // and not in use by the ServiceThread) 1004 bool nmethod::can_convert_to_zombie() { 1005 assert(is_not_entrant(), "must be a non-entrant method"); 1006 1007 // Since the nmethod sweeper only does partial sweep the sweeper's traversal 1008 // count can be greater than the stack traversal count before it hits the 1009 // nmethod for the second time. 1010 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count() && 1011 !is_locked_by_vm(); 1012 } 1013 1014 void nmethod::inc_decompile_count() { 1015 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return; 1016 // Could be gated by ProfileTraps, but do not bother... 1017 Method* m = method(); 1018 if (m == NULL) return; 1019 MethodData* mdo = m->method_data(); 1020 if (mdo == NULL) return; 1021 // There is a benign race here. See comments in methodData.hpp. 1022 mdo->inc_decompile_count(); 1023 } 1024 1025 void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) { 1026 1027 post_compiled_method_unload(); 1028 1029 // Since this nmethod is being unloaded, make sure that dependencies 1030 // recorded in instanceKlasses get flushed and pass non-NULL closure to 1031 // indicate that this work is being done during a GC. 1032 assert(Universe::heap()->is_gc_active(), "should only be called during gc"); 1033 assert(is_alive != NULL, "Should be non-NULL"); 1034 // A non-NULL is_alive closure indicates that this is being called during GC. 1035 flush_dependencies(is_alive); 1036 1037 // Break cycle between nmethod & method 1038 if (log_is_enabled(Trace, class, unload)) { 1039 outputStream* log = Log(class, unload)::trace_stream(); 1040 log->print_cr("making nmethod " INTPTR_FORMAT 1041 " unloadable, Method*(" INTPTR_FORMAT 1042 "), cause(" INTPTR_FORMAT ")", 1043 p2i(this), p2i(_method), p2i(cause)); 1044 if (!Universe::heap()->is_gc_active()) 1045 cause->klass()->print_on(log); 1046 } 1047 // Unlink the osr method, so we do not look this up again 1048 if (is_osr_method()) { 1049 // Invalidate the osr nmethod only once 1050 if (is_in_use()) { 1051 invalidate_osr_method(); 1052 } 1053 #ifdef ASSERT 1054 if (method() != NULL) { 1055 // Make sure osr nmethod is invalidated, i.e. not on the list 1056 bool found = method()->method_holder()->remove_osr_nmethod(this); 1057 assert(!found, "osr nmethod should have been invalidated"); 1058 } 1059 #endif 1060 } 1061 1062 // If _method is already NULL the Method* is about to be unloaded, 1063 // so we don't have to break the cycle. Note that it is possible to 1064 // have the Method* live here, in case we unload the nmethod because 1065 // it is pointing to some oop (other than the Method*) being unloaded. 1066 if (_method != NULL) { 1067 // OSR methods point to the Method*, but the Method* does not 1068 // point back! 1069 if (_method->code() == this) { 1070 _method->clear_code(); // Break a cycle 1071 } 1072 _method = NULL; // Clear the method of this dead nmethod 1073 } 1074 1075 // Make the class unloaded - i.e., change state and notify sweeper 1076 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); 1077 if (is_in_use()) { 1078 // Transitioning directly from live to unloaded -- so 1079 // we need to force a cache clean-up; remember this 1080 // for later on. 1081 CodeCache::set_needs_cache_clean(true); 1082 } 1083 1084 // Unregister must be done before the state change 1085 Universe::heap()->unregister_nmethod(this); 1086 1087 _state = unloaded; 1088 1089 // Log the unloading. 1090 log_state_change(); 1091 1092 #if INCLUDE_JVMCI 1093 // The method can only be unloaded after the pointer to the installed code 1094 // Java wrapper is no longer alive. Here we need to clear out this weak 1095 // reference to the dead object. Nulling out the reference has to happen 1096 // after the method is unregistered since the original value may be still 1097 // tracked by the rset. 1098 maybe_invalidate_installed_code(); 1099 // Clear these out after the nmethod has been unregistered and any 1100 // updates to the InstalledCode instance have been performed. 1101 _jvmci_installed_code = NULL; 1102 _speculation_log = NULL; 1103 #endif 1104 1105 // The Method* is gone at this point 1106 assert(_method == NULL, "Tautology"); 1107 1108 set_osr_link(NULL); 1109 NMethodSweeper::report_state_change(this); 1110 } 1111 1112 void nmethod::invalidate_osr_method() { 1113 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); 1114 // Remove from list of active nmethods 1115 if (method() != NULL) { 1116 method()->method_holder()->remove_osr_nmethod(this); 1117 } 1118 } 1119 1120 void nmethod::log_state_change() const { 1121 if (LogCompilation) { 1122 if (xtty != NULL) { 1123 ttyLocker ttyl; // keep the following output all in one block 1124 if (_state == unloaded) { 1125 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'", 1126 os::current_thread_id()); 1127 } else { 1128 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s", 1129 os::current_thread_id(), 1130 (_state == zombie ? " zombie='1'" : "")); 1131 } 1132 log_identity(xtty); 1133 xtty->stamp(); 1134 xtty->end_elem(); 1135 } 1136 } 1137 1138 const char *state_msg = _state == zombie ? "made zombie" : "made not entrant"; 1139 CompileTask::print_ul(this, state_msg); 1140 if (PrintCompilation && _state != unloaded) { 1141 print_on(tty, state_msg); 1142 } 1143 } 1144 1145 /** 1146 * Common functionality for both make_not_entrant and make_zombie 1147 */ 1148 bool nmethod::make_not_entrant_or_zombie(unsigned int state) { 1149 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant"); 1150 assert(!is_zombie(), "should not already be a zombie"); 1151 1152 if (_state == state) { 1153 // Avoid taking the lock if already in required state. 1154 // This is safe from races because the state is an end-state, 1155 // which the nmethod cannot back out of once entered. 1156 // No need for fencing either. 1157 return false; 1158 } 1159 1160 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below. 1161 nmethodLocker nml(this); 1162 methodHandle the_method(method()); 1163 NoSafepointVerifier nsv; 1164 1165 // during patching, depending on the nmethod state we must notify the GC that 1166 // code has been unloaded, unregistering it. We cannot do this right while 1167 // holding the Patching_lock because we need to use the CodeCache_lock. This 1168 // would be prone to deadlocks. 1169 // This flag is used to remember whether we need to later lock and unregister. 1170 bool nmethod_needs_unregister = false; 1171 1172 { 1173 // invalidate osr nmethod before acquiring the patching lock since 1174 // they both acquire leaf locks and we don't want a deadlock. 1175 // This logic is equivalent to the logic below for patching the 1176 // verified entry point of regular methods. We check that the 1177 // nmethod is in use to ensure that it is invalidated only once. 1178 if (is_osr_method() && is_in_use()) { 1179 // this effectively makes the osr nmethod not entrant 1180 invalidate_osr_method(); 1181 } 1182 1183 // Enter critical section. Does not block for safepoint. 1184 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 1185 1186 if (_state == state) { 1187 // another thread already performed this transition so nothing 1188 // to do, but return false to indicate this. 1189 return false; 1190 } 1191 1192 // The caller can be calling the method statically or through an inline 1193 // cache call. 1194 if (!is_osr_method() && !is_not_entrant()) { 1195 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(), 1196 SharedRuntime::get_handle_wrong_method_stub()); 1197 } 1198 1199 if (is_in_use() && update_recompile_counts()) { 1200 // It's a true state change, so mark the method as decompiled. 1201 // Do it only for transition from alive. 1202 inc_decompile_count(); 1203 } 1204 1205 // If the state is becoming a zombie, signal to unregister the nmethod with 1206 // the heap. 1207 // This nmethod may have already been unloaded during a full GC. 1208 if ((state == zombie) && !is_unloaded()) { 1209 nmethod_needs_unregister = true; 1210 } 1211 1212 // Must happen before state change. Otherwise we have a race condition in 1213 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately 1214 // transition its state from 'not_entrant' to 'zombie' without having to wait 1215 // for stack scanning. 1216 if (state == not_entrant) { 1217 mark_as_seen_on_stack(); 1218 OrderAccess::storestore(); 1219 } 1220 1221 // Change state 1222 _state = state; 1223 1224 // Log the transition once 1225 log_state_change(); 1226 1227 // Invalidate while holding the patching lock 1228 JVMCI_ONLY(maybe_invalidate_installed_code()); 1229 1230 // Remove nmethod from method. 1231 // We need to check if both the _code and _from_compiled_code_entry_point 1232 // refer to this nmethod because there is a race in setting these two fields 1233 // in Method* as seen in bugid 4947125. 1234 // If the vep() points to the zombie nmethod, the memory for the nmethod 1235 // could be flushed and the compiler and vtable stubs could still call 1236 // through it. 1237 if (method() != NULL && (method()->code() == this || 1238 method()->from_compiled_entry() == verified_entry_point())) { 1239 HandleMark hm; 1240 method()->clear_code(false /* already owns Patching_lock */); 1241 } 1242 } // leave critical region under Patching_lock 1243 1244 #ifdef ASSERT 1245 if (is_osr_method() && method() != NULL) { 1246 // Make sure osr nmethod is invalidated, i.e. not on the list 1247 bool found = method()->method_holder()->remove_osr_nmethod(this); 1248 assert(!found, "osr nmethod should have been invalidated"); 1249 } 1250 #endif 1251 1252 // When the nmethod becomes zombie it is no longer alive so the 1253 // dependencies must be flushed. nmethods in the not_entrant 1254 // state will be flushed later when the transition to zombie 1255 // happens or they get unloaded. 1256 if (state == zombie) { 1257 { 1258 // Flushing dependencies must be done before any possible 1259 // safepoint can sneak in, otherwise the oops used by the 1260 // dependency logic could have become stale. 1261 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1262 if (nmethod_needs_unregister) { 1263 Universe::heap()->unregister_nmethod(this); 1264 #ifdef JVMCI 1265 _jvmci_installed_code = NULL; 1266 _speculation_log = NULL; 1267 #endif 1268 } 1269 flush_dependencies(NULL); 1270 } 1271 1272 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload 1273 // event and it hasn't already been reported for this nmethod then 1274 // report it now. The event may have been reported earlier if the GC 1275 // marked it for unloading). JvmtiDeferredEventQueue support means 1276 // we no longer go to a safepoint here. 1277 post_compiled_method_unload(); 1278 1279 #ifdef ASSERT 1280 // It's no longer safe to access the oops section since zombie 1281 // nmethods aren't scanned for GC. 1282 _oops_are_stale = true; 1283 #endif 1284 // the Method may be reclaimed by class unloading now that the 1285 // nmethod is in zombie state 1286 set_method(NULL); 1287 } else { 1288 assert(state == not_entrant, "other cases may need to be handled differently"); 1289 } 1290 1291 if (TraceCreateZombies) { 1292 ResourceMark m; 1293 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"); 1294 } 1295 1296 NMethodSweeper::report_state_change(this); 1297 return true; 1298 } 1299 1300 void nmethod::flush() { 1301 // Note that there are no valid oops in the nmethod anymore. 1302 assert(!is_osr_method() || is_unloaded() || is_zombie(), 1303 "osr nmethod must be unloaded or zombie before flushing"); 1304 assert(is_zombie() || is_osr_method(), "must be a zombie method"); 1305 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed"); 1306 assert_locked_or_safepoint(CodeCache_lock); 1307 1308 // completely deallocate this method 1309 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, p2i(this)); 1310 if (PrintMethodFlushing) { 1311 tty->print_cr("*flushing %s nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT 1312 "/Free CodeCache:" SIZE_FORMAT "Kb", 1313 is_osr_method() ? "osr" : "",_compile_id, p2i(this), CodeCache::blob_count(), 1314 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024); 1315 } 1316 1317 // We need to deallocate any ExceptionCache data. 1318 // Note that we do not need to grab the nmethod lock for this, it 1319 // better be thread safe if we're disposing of it! 1320 ExceptionCache* ec = exception_cache(); 1321 set_exception_cache(NULL); 1322 while(ec != NULL) { 1323 ExceptionCache* next = ec->next(); 1324 delete ec; 1325 ec = next; 1326 } 1327 1328 if (on_scavenge_root_list()) { 1329 CodeCache::drop_scavenge_root_nmethod(this); 1330 } 1331 1332 #ifdef SHARK 1333 ((SharkCompiler *) compiler())->free_compiled_method(insts_begin()); 1334 #endif // SHARK 1335 1336 CodeBlob::flush(); 1337 CodeCache::free(this); 1338 } 1339 1340 // 1341 // Notify all classes this nmethod is dependent on that it is no 1342 // longer dependent. This should only be called in two situations. 1343 // First, when a nmethod transitions to a zombie all dependents need 1344 // to be clear. Since zombification happens at a safepoint there's no 1345 // synchronization issues. The second place is a little more tricky. 1346 // During phase 1 of mark sweep class unloading may happen and as a 1347 // result some nmethods may get unloaded. In this case the flushing 1348 // of dependencies must happen during phase 1 since after GC any 1349 // dependencies in the unloaded nmethod won't be updated, so 1350 // traversing the dependency information in unsafe. In that case this 1351 // function is called with a non-NULL argument and this function only 1352 // notifies instanceKlasses that are reachable 1353 1354 void nmethod::flush_dependencies(BoolObjectClosure* is_alive) { 1355 assert_locked_or_safepoint(CodeCache_lock); 1356 assert(Universe::heap()->is_gc_active() == (is_alive != NULL), 1357 "is_alive is non-NULL if and only if we are called during GC"); 1358 if (!has_flushed_dependencies()) { 1359 set_has_flushed_dependencies(); 1360 for (Dependencies::DepStream deps(this); deps.next(); ) { 1361 if (deps.type() == Dependencies::call_site_target_value) { 1362 // CallSite dependencies are managed on per-CallSite instance basis. 1363 oop call_site = deps.argument_oop(0); 1364 MethodHandles::remove_dependent_nmethod(call_site, this); 1365 } else { 1366 Klass* klass = deps.context_type(); 1367 if (klass == NULL) { 1368 continue; // ignore things like evol_method 1369 } 1370 // During GC the is_alive closure is non-NULL, and is used to 1371 // determine liveness of dependees that need to be updated. 1372 if (is_alive == NULL || klass->is_loader_alive(is_alive)) { 1373 // The GC defers deletion of this entry, since there might be multiple threads 1374 // iterating over the _dependencies graph. Other call paths are single-threaded 1375 // and may delete it immediately. 1376 bool delete_immediately = is_alive == NULL; 1377 InstanceKlass::cast(klass)->remove_dependent_nmethod(this, delete_immediately); 1378 } 1379 } 1380 } 1381 } 1382 } 1383 1384 1385 // If this oop is not live, the nmethod can be unloaded. 1386 bool nmethod::can_unload(BoolObjectClosure* is_alive, oop* root, bool unloading_occurred) { 1387 assert(root != NULL, "just checking"); 1388 oop obj = *root; 1389 if (obj == NULL || is_alive->do_object_b(obj)) { 1390 return false; 1391 } 1392 1393 // If ScavengeRootsInCode is true, an nmethod might be unloaded 1394 // simply because one of its constant oops has gone dead. 1395 // No actual classes need to be unloaded in order for this to occur. 1396 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading"); 1397 make_unloaded(is_alive, obj); 1398 return true; 1399 } 1400 1401 // ------------------------------------------------------------------ 1402 // post_compiled_method_load_event 1403 // new method for install_code() path 1404 // Transfer information from compilation to jvmti 1405 void nmethod::post_compiled_method_load_event() { 1406 1407 Method* moop = method(); 1408 HOTSPOT_COMPILED_METHOD_LOAD( 1409 (char *) moop->klass_name()->bytes(), 1410 moop->klass_name()->utf8_length(), 1411 (char *) moop->name()->bytes(), 1412 moop->name()->utf8_length(), 1413 (char *) moop->signature()->bytes(), 1414 moop->signature()->utf8_length(), 1415 insts_begin(), insts_size()); 1416 1417 if (JvmtiExport::should_post_compiled_method_load() || 1418 JvmtiExport::should_post_compiled_method_unload()) { 1419 get_and_cache_jmethod_id(); 1420 } 1421 1422 if (JvmtiExport::should_post_compiled_method_load()) { 1423 // Let the Service thread (which is a real Java thread) post the event 1424 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); 1425 JvmtiDeferredEventQueue::enqueue( 1426 JvmtiDeferredEvent::compiled_method_load_event(this)); 1427 } 1428 } 1429 1430 jmethodID nmethod::get_and_cache_jmethod_id() { 1431 if (_jmethod_id == NULL) { 1432 // Cache the jmethod_id since it can no longer be looked up once the 1433 // method itself has been marked for unloading. 1434 _jmethod_id = method()->jmethod_id(); 1435 } 1436 return _jmethod_id; 1437 } 1438 1439 void nmethod::post_compiled_method_unload() { 1440 if (unload_reported()) { 1441 // During unloading we transition to unloaded and then to zombie 1442 // and the unloading is reported during the first transition. 1443 return; 1444 } 1445 1446 assert(_method != NULL && !is_unloaded(), "just checking"); 1447 DTRACE_METHOD_UNLOAD_PROBE(method()); 1448 1449 // If a JVMTI agent has enabled the CompiledMethodUnload event then 1450 // post the event. Sometime later this nmethod will be made a zombie 1451 // by the sweeper but the Method* will not be valid at that point. 1452 // If the _jmethod_id is null then no load event was ever requested 1453 // so don't bother posting the unload. The main reason for this is 1454 // that the jmethodID is a weak reference to the Method* so if 1455 // it's being unloaded there's no way to look it up since the weak 1456 // ref will have been cleared. 1457 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) { 1458 assert(!unload_reported(), "already unloaded"); 1459 JvmtiDeferredEvent event = 1460 JvmtiDeferredEvent::compiled_method_unload_event(this, 1461 _jmethod_id, insts_begin()); 1462 if (SafepointSynchronize::is_at_safepoint()) { 1463 // Don't want to take the queueing lock. Add it as pending and 1464 // it will get enqueued later. 1465 JvmtiDeferredEventQueue::add_pending_event(event); 1466 } else { 1467 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); 1468 JvmtiDeferredEventQueue::enqueue(event); 1469 } 1470 } 1471 1472 // The JVMTI CompiledMethodUnload event can be enabled or disabled at 1473 // any time. As the nmethod is being unloaded now we mark it has 1474 // having the unload event reported - this will ensure that we don't 1475 // attempt to report the event in the unlikely scenario where the 1476 // event is enabled at the time the nmethod is made a zombie. 1477 set_unload_reported(); 1478 } 1479 1480 bool nmethod::unload_if_dead_at(RelocIterator* iter_at_oop, BoolObjectClosure *is_alive, bool unloading_occurred) { 1481 assert(iter_at_oop->type() == relocInfo::oop_type, "Wrong relocation type"); 1482 1483 oop_Relocation* r = iter_at_oop->oop_reloc(); 1484 // Traverse those oops directly embedded in the code. 1485 // Other oops (oop_index>0) are seen as part of scopes_oops. 1486 assert(1 == (r->oop_is_immediate()) + 1487 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 1488 "oop must be found in exactly one place"); 1489 if (r->oop_is_immediate() && r->oop_value() != NULL) { 1490 // Unload this nmethod if the oop is dead. 1491 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) { 1492 return true;; 1493 } 1494 } 1495 1496 return false; 1497 } 1498 1499 bool nmethod::do_unloading_scopes(BoolObjectClosure* is_alive, bool unloading_occurred) { 1500 // Scopes 1501 for (oop* p = oops_begin(); p < oops_end(); p++) { 1502 if (*p == Universe::non_oop_word()) continue; // skip non-oops 1503 if (can_unload(is_alive, p, unloading_occurred)) { 1504 return true; 1505 } 1506 } 1507 return false; 1508 } 1509 1510 bool nmethod::do_unloading_oops(address low_boundary, BoolObjectClosure* is_alive, bool unloading_occurred) { 1511 // Compiled code 1512 { 1513 RelocIterator iter(this, low_boundary); 1514 while (iter.next()) { 1515 if (iter.type() == relocInfo::oop_type) { 1516 if (unload_if_dead_at(&iter, is_alive, unloading_occurred)) { 1517 return true; 1518 } 1519 } 1520 } 1521 } 1522 1523 return do_unloading_scopes(is_alive, unloading_occurred); 1524 } 1525 1526 #if INCLUDE_JVMCI 1527 bool nmethod::do_unloading_jvmci(BoolObjectClosure* is_alive, bool unloading_occurred) { 1528 bool is_unloaded = false; 1529 // Follow JVMCI method 1530 BarrierSet* bs = Universe::heap()->barrier_set(); 1531 if (_jvmci_installed_code != NULL) { 1532 if (_jvmci_installed_code->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(_jvmci_installed_code)) { 1533 if (!is_alive->do_object_b(_jvmci_installed_code)) { 1534 clear_jvmci_installed_code(); 1535 } 1536 } else { 1537 if (can_unload(is_alive, (oop*)&_jvmci_installed_code, unloading_occurred)) { 1538 return true; 1539 } 1540 } 1541 } 1542 1543 if (_speculation_log != NULL) { 1544 if (!is_alive->do_object_b(_speculation_log)) { 1545 bs->write_ref_nmethod_pre(&_speculation_log, this); 1546 _speculation_log = NULL; 1547 bs->write_ref_nmethod_post(&_speculation_log, this); 1548 } 1549 } 1550 return is_unloaded; 1551 } 1552 #endif 1553 1554 // Iterate over metadata calling this function. Used by RedefineClasses 1555 void nmethod::metadata_do(void f(Metadata*)) { 1556 address low_boundary = verified_entry_point(); 1557 if (is_not_entrant()) { 1558 low_boundary += NativeJump::instruction_size; 1559 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1560 // (See comment above.) 1561 } 1562 { 1563 // Visit all immediate references that are embedded in the instruction stream. 1564 RelocIterator iter(this, low_boundary); 1565 while (iter.next()) { 1566 if (iter.type() == relocInfo::metadata_type ) { 1567 metadata_Relocation* r = iter.metadata_reloc(); 1568 // In this metadata, we must only follow those metadatas directly embedded in 1569 // the code. Other metadatas (oop_index>0) are seen as part of 1570 // the metadata section below. 1571 assert(1 == (r->metadata_is_immediate()) + 1572 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()), 1573 "metadata must be found in exactly one place"); 1574 if (r->metadata_is_immediate() && r->metadata_value() != NULL) { 1575 Metadata* md = r->metadata_value(); 1576 if (md != _method) f(md); 1577 } 1578 } else if (iter.type() == relocInfo::virtual_call_type) { 1579 // Check compiledIC holders associated with this nmethod 1580 CompiledIC *ic = CompiledIC_at(&iter); 1581 if (ic->is_icholder_call()) { 1582 CompiledICHolder* cichk = ic->cached_icholder(); 1583 f(cichk->holder_method()); 1584 f(cichk->holder_klass()); 1585 } else { 1586 Metadata* ic_oop = ic->cached_metadata(); 1587 if (ic_oop != NULL) { 1588 f(ic_oop); 1589 } 1590 } 1591 } 1592 } 1593 } 1594 1595 // Visit the metadata section 1596 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) { 1597 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops 1598 Metadata* md = *p; 1599 f(md); 1600 } 1601 1602 // Visit metadata not embedded in the other places. 1603 if (_method != NULL) f(_method); 1604 } 1605 1606 void nmethod::oops_do(OopClosure* f, bool allow_zombie) { 1607 // make sure the oops ready to receive visitors 1608 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod"); 1609 assert(!is_unloaded(), "should not call follow on unloaded nmethod"); 1610 1611 // If the method is not entrant or zombie then a JMP is plastered over the 1612 // first few bytes. If an oop in the old code was there, that oop 1613 // should not get GC'd. Skip the first few bytes of oops on 1614 // not-entrant methods. 1615 address low_boundary = verified_entry_point(); 1616 if (is_not_entrant()) { 1617 low_boundary += NativeJump::instruction_size; 1618 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1619 // (See comment above.) 1620 } 1621 1622 #if INCLUDE_JVMCI 1623 if (_jvmci_installed_code != NULL) { 1624 f->do_oop((oop*) &_jvmci_installed_code); 1625 } 1626 if (_speculation_log != NULL) { 1627 f->do_oop((oop*) &_speculation_log); 1628 } 1629 #endif 1630 1631 RelocIterator iter(this, low_boundary); 1632 1633 while (iter.next()) { 1634 if (iter.type() == relocInfo::oop_type ) { 1635 oop_Relocation* r = iter.oop_reloc(); 1636 // In this loop, we must only follow those oops directly embedded in 1637 // the code. Other oops (oop_index>0) are seen as part of scopes_oops. 1638 assert(1 == (r->oop_is_immediate()) + 1639 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 1640 "oop must be found in exactly one place"); 1641 if (r->oop_is_immediate() && r->oop_value() != NULL) { 1642 f->do_oop(r->oop_addr()); 1643 } 1644 } 1645 } 1646 1647 // Scopes 1648 // This includes oop constants not inlined in the code stream. 1649 for (oop* p = oops_begin(); p < oops_end(); p++) { 1650 if (*p == Universe::non_oop_word()) continue; // skip non-oops 1651 f->do_oop(p); 1652 } 1653 } 1654 1655 #define NMETHOD_SENTINEL ((nmethod*)badAddress) 1656 1657 nmethod* volatile nmethod::_oops_do_mark_nmethods; 1658 1659 // An nmethod is "marked" if its _mark_link is set non-null. 1660 // Even if it is the end of the linked list, it will have a non-null link value, 1661 // as long as it is on the list. 1662 // This code must be MP safe, because it is used from parallel GC passes. 1663 bool nmethod::test_set_oops_do_mark() { 1664 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called"); 1665 nmethod* observed_mark_link = _oops_do_mark_link; 1666 if (observed_mark_link == NULL) { 1667 // Claim this nmethod for this thread to mark. 1668 observed_mark_link = (nmethod*) 1669 Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_link, NULL); 1670 if (observed_mark_link == NULL) { 1671 1672 // Atomically append this nmethod (now claimed) to the head of the list: 1673 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods; 1674 for (;;) { 1675 nmethod* required_mark_nmethods = observed_mark_nmethods; 1676 _oops_do_mark_link = required_mark_nmethods; 1677 observed_mark_nmethods = (nmethod*) 1678 Atomic::cmpxchg_ptr(this, &_oops_do_mark_nmethods, required_mark_nmethods); 1679 if (observed_mark_nmethods == required_mark_nmethods) 1680 break; 1681 } 1682 // Mark was clear when we first saw this guy. 1683 if (TraceScavenge) { print_on(tty, "oops_do, mark"); } 1684 return false; 1685 } 1686 } 1687 // On fall through, another racing thread marked this nmethod before we did. 1688 return true; 1689 } 1690 1691 void nmethod::oops_do_marking_prologue() { 1692 if (TraceScavenge) { tty->print_cr("[oops_do_marking_prologue"); } 1693 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row"); 1694 // We use cmpxchg_ptr instead of regular assignment here because the user 1695 // may fork a bunch of threads, and we need them all to see the same state. 1696 void* observed = Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, NULL); 1697 guarantee(observed == NULL, "no races in this sequential code"); 1698 } 1699 1700 void nmethod::oops_do_marking_epilogue() { 1701 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row"); 1702 nmethod* cur = _oops_do_mark_nmethods; 1703 while (cur != NMETHOD_SENTINEL) { 1704 assert(cur != NULL, "not NULL-terminated"); 1705 nmethod* next = cur->_oops_do_mark_link; 1706 cur->_oops_do_mark_link = NULL; 1707 DEBUG_ONLY(cur->verify_oop_relocations()); 1708 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark")); 1709 cur = next; 1710 } 1711 void* required = _oops_do_mark_nmethods; 1712 void* observed = Atomic::cmpxchg_ptr(NULL, &_oops_do_mark_nmethods, required); 1713 guarantee(observed == required, "no races in this sequential code"); 1714 if (TraceScavenge) { tty->print_cr("oops_do_marking_epilogue]"); } 1715 } 1716 1717 class DetectScavengeRoot: public OopClosure { 1718 bool _detected_scavenge_root; 1719 public: 1720 DetectScavengeRoot() : _detected_scavenge_root(false) 1721 { NOT_PRODUCT(_print_nm = NULL); } 1722 bool detected_scavenge_root() { return _detected_scavenge_root; } 1723 virtual void do_oop(oop* p) { 1724 if ((*p) != NULL && (*p)->is_scavengable()) { 1725 NOT_PRODUCT(maybe_print(p)); 1726 _detected_scavenge_root = true; 1727 } 1728 } 1729 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 1730 1731 #ifndef PRODUCT 1732 nmethod* _print_nm; 1733 void maybe_print(oop* p) { 1734 if (_print_nm == NULL) return; 1735 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root"); 1736 tty->print_cr("" PTR_FORMAT "[offset=%d] detected scavengable oop " PTR_FORMAT " (found at " PTR_FORMAT ")", 1737 p2i(_print_nm), (int)((intptr_t)p - (intptr_t)_print_nm), 1738 p2i(*p), p2i(p)); 1739 (*p)->print(); 1740 } 1741 #endif //PRODUCT 1742 }; 1743 1744 bool nmethod::detect_scavenge_root_oops() { 1745 DetectScavengeRoot detect_scavenge_root; 1746 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this); 1747 oops_do(&detect_scavenge_root); 1748 return detect_scavenge_root.detected_scavenge_root(); 1749 } 1750 1751 inline bool includes(void* p, void* from, void* to) { 1752 return from <= p && p < to; 1753 } 1754 1755 1756 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) { 1757 assert(count >= 2, "must be sentinel values, at least"); 1758 1759 #ifdef ASSERT 1760 // must be sorted and unique; we do a binary search in find_pc_desc() 1761 int prev_offset = pcs[0].pc_offset(); 1762 assert(prev_offset == PcDesc::lower_offset_limit, 1763 "must start with a sentinel"); 1764 for (int i = 1; i < count; i++) { 1765 int this_offset = pcs[i].pc_offset(); 1766 assert(this_offset > prev_offset, "offsets must be sorted"); 1767 prev_offset = this_offset; 1768 } 1769 assert(prev_offset == PcDesc::upper_offset_limit, 1770 "must end with a sentinel"); 1771 #endif //ASSERT 1772 1773 // Search for MethodHandle invokes and tag the nmethod. 1774 for (int i = 0; i < count; i++) { 1775 if (pcs[i].is_method_handle_invoke()) { 1776 set_has_method_handle_invokes(true); 1777 break; 1778 } 1779 } 1780 assert(has_method_handle_invokes() == (_deopt_mh_handler_begin != NULL), "must have deopt mh handler"); 1781 1782 int size = count * sizeof(PcDesc); 1783 assert(scopes_pcs_size() >= size, "oob"); 1784 memcpy(scopes_pcs_begin(), pcs, size); 1785 1786 // Adjust the final sentinel downward. 1787 PcDesc* last_pc = &scopes_pcs_begin()[count-1]; 1788 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity"); 1789 last_pc->set_pc_offset(content_size() + 1); 1790 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) { 1791 // Fill any rounding gaps with copies of the last record. 1792 last_pc[1] = last_pc[0]; 1793 } 1794 // The following assert could fail if sizeof(PcDesc) is not 1795 // an integral multiple of oopSize (the rounding term). 1796 // If it fails, change the logic to always allocate a multiple 1797 // of sizeof(PcDesc), and fill unused words with copies of *last_pc. 1798 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly"); 1799 } 1800 1801 void nmethod::copy_scopes_data(u_char* buffer, int size) { 1802 assert(scopes_data_size() >= size, "oob"); 1803 memcpy(scopes_data_begin(), buffer, size); 1804 } 1805 1806 #ifdef ASSERT 1807 static PcDesc* linear_search(const PcDescSearch& search, int pc_offset, bool approximate) { 1808 PcDesc* lower = search.scopes_pcs_begin(); 1809 PcDesc* upper = search.scopes_pcs_end(); 1810 lower += 1; // exclude initial sentinel 1811 PcDesc* res = NULL; 1812 for (PcDesc* p = lower; p < upper; p++) { 1813 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc 1814 if (match_desc(p, pc_offset, approximate)) { 1815 if (res == NULL) 1816 res = p; 1817 else 1818 res = (PcDesc*) badAddress; 1819 } 1820 } 1821 return res; 1822 } 1823 #endif 1824 1825 1826 // Finds a PcDesc with real-pc equal to "pc" 1827 PcDesc* PcDescContainer::find_pc_desc_internal(address pc, bool approximate, const PcDescSearch& search) { 1828 address base_address = search.code_begin(); 1829 if ((pc < base_address) || 1830 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) { 1831 return NULL; // PC is wildly out of range 1832 } 1833 int pc_offset = (int) (pc - base_address); 1834 1835 // Check the PcDesc cache if it contains the desired PcDesc 1836 // (This as an almost 100% hit rate.) 1837 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate); 1838 if (res != NULL) { 1839 assert(res == linear_search(search, pc_offset, approximate), "cache ok"); 1840 return res; 1841 } 1842 1843 // Fallback algorithm: quasi-linear search for the PcDesc 1844 // Find the last pc_offset less than the given offset. 1845 // The successor must be the required match, if there is a match at all. 1846 // (Use a fixed radix to avoid expensive affine pointer arithmetic.) 1847 PcDesc* lower = search.scopes_pcs_begin(); 1848 PcDesc* upper = search.scopes_pcs_end(); 1849 upper -= 1; // exclude final sentinel 1850 if (lower >= upper) return NULL; // native method; no PcDescs at all 1851 1852 #define assert_LU_OK \ 1853 /* invariant on lower..upper during the following search: */ \ 1854 assert(lower->pc_offset() < pc_offset, "sanity"); \ 1855 assert(upper->pc_offset() >= pc_offset, "sanity") 1856 assert_LU_OK; 1857 1858 // Use the last successful return as a split point. 1859 PcDesc* mid = _pc_desc_cache.last_pc_desc(); 1860 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 1861 if (mid->pc_offset() < pc_offset) { 1862 lower = mid; 1863 } else { 1864 upper = mid; 1865 } 1866 1867 // Take giant steps at first (4096, then 256, then 16, then 1) 1868 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1); 1869 const int RADIX = (1 << LOG2_RADIX); 1870 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) { 1871 while ((mid = lower + step) < upper) { 1872 assert_LU_OK; 1873 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 1874 if (mid->pc_offset() < pc_offset) { 1875 lower = mid; 1876 } else { 1877 upper = mid; 1878 break; 1879 } 1880 } 1881 assert_LU_OK; 1882 } 1883 1884 // Sneak up on the value with a linear search of length ~16. 1885 while (true) { 1886 assert_LU_OK; 1887 mid = lower + 1; 1888 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 1889 if (mid->pc_offset() < pc_offset) { 1890 lower = mid; 1891 } else { 1892 upper = mid; 1893 break; 1894 } 1895 } 1896 #undef assert_LU_OK 1897 1898 if (match_desc(upper, pc_offset, approximate)) { 1899 assert(upper == linear_search(search, pc_offset, approximate), "search ok"); 1900 _pc_desc_cache.add_pc_desc(upper); 1901 return upper; 1902 } else { 1903 assert(NULL == linear_search(search, pc_offset, approximate), "search ok"); 1904 return NULL; 1905 } 1906 } 1907 1908 1909 void nmethod::check_all_dependencies(DepChange& changes) { 1910 // Checked dependencies are allocated into this ResourceMark 1911 ResourceMark rm; 1912 1913 // Turn off dependency tracing while actually testing dependencies. 1914 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) ); 1915 1916 typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash, 1917 &DependencySignature::equals, 11027> DepTable; 1918 1919 DepTable* table = new DepTable(); 1920 1921 // Iterate over live nmethods and check dependencies of all nmethods that are not 1922 // marked for deoptimization. A particular dependency is only checked once. 1923 NMethodIterator iter; 1924 while(iter.next()) { 1925 nmethod* nm = iter.method(); 1926 // Only notify for live nmethods 1927 if (nm->is_alive() && !nm->is_marked_for_deoptimization()) { 1928 for (Dependencies::DepStream deps(nm); deps.next(); ) { 1929 // Construct abstraction of a dependency. 1930 DependencySignature* current_sig = new DependencySignature(deps); 1931 1932 // Determine if dependency is already checked. table->put(...) returns 1933 // 'true' if the dependency is added (i.e., was not in the hashtable). 1934 if (table->put(*current_sig, 1)) { 1935 if (deps.check_dependency() != NULL) { 1936 // Dependency checking failed. Print out information about the failed 1937 // dependency and finally fail with an assert. We can fail here, since 1938 // dependency checking is never done in a product build. 1939 tty->print_cr("Failed dependency:"); 1940 changes.print(); 1941 nm->print(); 1942 nm->print_dependencies(); 1943 assert(false, "Should have been marked for deoptimization"); 1944 } 1945 } 1946 } 1947 } 1948 } 1949 } 1950 1951 bool nmethod::check_dependency_on(DepChange& changes) { 1952 // What has happened: 1953 // 1) a new class dependee has been added 1954 // 2) dependee and all its super classes have been marked 1955 bool found_check = false; // set true if we are upset 1956 for (Dependencies::DepStream deps(this); deps.next(); ) { 1957 // Evaluate only relevant dependencies. 1958 if (deps.spot_check_dependency_at(changes) != NULL) { 1959 found_check = true; 1960 NOT_DEBUG(break); 1961 } 1962 } 1963 return found_check; 1964 } 1965 1966 bool nmethod::is_evol_dependent_on(Klass* dependee) { 1967 InstanceKlass *dependee_ik = InstanceKlass::cast(dependee); 1968 Array<Method*>* dependee_methods = dependee_ik->methods(); 1969 for (Dependencies::DepStream deps(this); deps.next(); ) { 1970 if (deps.type() == Dependencies::evol_method) { 1971 Method* method = deps.method_argument(0); 1972 for (int j = 0; j < dependee_methods->length(); j++) { 1973 if (dependee_methods->at(j) == method) { 1974 if (log_is_enabled(Debug, redefine, class, nmethod)) { 1975 ResourceMark rm; 1976 log_debug(redefine, class, nmethod) 1977 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)", 1978 _method->method_holder()->external_name(), 1979 _method->name()->as_C_string(), 1980 _method->signature()->as_C_string(), 1981 compile_id(), 1982 method->method_holder()->external_name(), 1983 method->name()->as_C_string(), 1984 method->signature()->as_C_string()); 1985 } 1986 if (TraceDependencies || LogCompilation) 1987 deps.log_dependency(dependee); 1988 return true; 1989 } 1990 } 1991 } 1992 } 1993 return false; 1994 } 1995 1996 // Called from mark_for_deoptimization, when dependee is invalidated. 1997 bool nmethod::is_dependent_on_method(Method* dependee) { 1998 for (Dependencies::DepStream deps(this); deps.next(); ) { 1999 if (deps.type() != Dependencies::evol_method) 2000 continue; 2001 Method* method = deps.method_argument(0); 2002 if (method == dependee) return true; 2003 } 2004 return false; 2005 } 2006 2007 2008 bool nmethod::is_patchable_at(address instr_addr) { 2009 assert(insts_contains(instr_addr), "wrong nmethod used"); 2010 if (is_zombie()) { 2011 // a zombie may never be patched 2012 return false; 2013 } 2014 return true; 2015 } 2016 2017 2018 address nmethod::continuation_for_implicit_exception(address pc) { 2019 // Exception happened outside inline-cache check code => we are inside 2020 // an active nmethod => use cpc to determine a return address 2021 int exception_offset = pc - code_begin(); 2022 int cont_offset = ImplicitExceptionTable(this).at( exception_offset ); 2023 #ifdef ASSERT 2024 if (cont_offset == 0) { 2025 Thread* thread = Thread::current(); 2026 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY 2027 HandleMark hm(thread); 2028 ResourceMark rm(thread); 2029 CodeBlob* cb = CodeCache::find_blob(pc); 2030 assert(cb != NULL && cb == this, ""); 2031 ttyLocker ttyl; 2032 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, p2i(pc)); 2033 print(); 2034 method()->print_codes(); 2035 print_code(); 2036 print_pcs(); 2037 } 2038 #endif 2039 if (cont_offset == 0) { 2040 // Let the normal error handling report the exception 2041 return NULL; 2042 } 2043 return code_begin() + cont_offset; 2044 } 2045 2046 2047 2048 void nmethod_init() { 2049 // make sure you didn't forget to adjust the filler fields 2050 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word"); 2051 } 2052 2053 2054 //------------------------------------------------------------------------------------------- 2055 2056 2057 // QQQ might we make this work from a frame?? 2058 nmethodLocker::nmethodLocker(address pc) { 2059 CodeBlob* cb = CodeCache::find_blob(pc); 2060 guarantee(cb != NULL && cb->is_compiled(), "bad pc for a nmethod found"); 2061 _nm = cb->as_compiled_method(); 2062 lock_nmethod(_nm); 2063 } 2064 2065 // Only JvmtiDeferredEvent::compiled_method_unload_event() 2066 // should pass zombie_ok == true. 2067 void nmethodLocker::lock_nmethod(CompiledMethod* cm, bool zombie_ok) { 2068 if (cm == NULL) return; 2069 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method 2070 nmethod* nm = cm->as_nmethod(); 2071 Atomic::inc(&nm->_lock_count); 2072 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method"); 2073 } 2074 2075 void nmethodLocker::unlock_nmethod(CompiledMethod* cm) { 2076 if (cm == NULL) return; 2077 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method 2078 nmethod* nm = cm->as_nmethod(); 2079 Atomic::dec(&nm->_lock_count); 2080 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock"); 2081 } 2082 2083 2084 // ----------------------------------------------------------------------------- 2085 // Verification 2086 2087 class VerifyOopsClosure: public OopClosure { 2088 nmethod* _nm; 2089 bool _ok; 2090 public: 2091 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { } 2092 bool ok() { return _ok; } 2093 virtual void do_oop(oop* p) { 2094 if ((*p) == NULL || (*p)->is_oop()) return; 2095 if (_ok) { 2096 _nm->print_nmethod(true); 2097 _ok = false; 2098 } 2099 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)", 2100 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm)); 2101 } 2102 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2103 }; 2104 2105 void nmethod::verify() { 2106 2107 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant 2108 // seems odd. 2109 2110 if (is_zombie() || is_not_entrant() || is_unloaded()) 2111 return; 2112 2113 // Make sure all the entry points are correctly aligned for patching. 2114 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point()); 2115 2116 // assert(method()->is_oop(), "must be valid"); 2117 2118 ResourceMark rm; 2119 2120 if (!CodeCache::contains(this)) { 2121 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this)); 2122 } 2123 2124 if(is_native_method() ) 2125 return; 2126 2127 nmethod* nm = CodeCache::find_nmethod(verified_entry_point()); 2128 if (nm != this) { 2129 fatal("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this)); 2130 } 2131 2132 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2133 if (! p->verify(this)) { 2134 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this)); 2135 } 2136 } 2137 2138 VerifyOopsClosure voc(this); 2139 oops_do(&voc); 2140 assert(voc.ok(), "embedded oops must be OK"); 2141 verify_scavenge_root_oops(); 2142 2143 verify_scopes(); 2144 } 2145 2146 2147 void nmethod::verify_interrupt_point(address call_site) { 2148 // Verify IC only when nmethod installation is finished. 2149 bool is_installed = (method()->code() == this) // nmethod is in state 'in_use' and installed 2150 || !this->is_in_use(); // nmethod is installed, but not in 'in_use' state 2151 if (is_installed) { 2152 Thread *cur = Thread::current(); 2153 if (CompiledIC_lock->owner() == cur || 2154 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) && 2155 SafepointSynchronize::is_at_safepoint())) { 2156 CompiledIC_at(this, call_site); 2157 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); 2158 } else { 2159 MutexLocker ml_verify (CompiledIC_lock); 2160 CompiledIC_at(this, call_site); 2161 } 2162 } 2163 2164 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address()); 2165 assert(pd != NULL, "PcDesc must exist"); 2166 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(), 2167 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(), 2168 pd->return_oop()); 2169 !sd->is_top(); sd = sd->sender()) { 2170 sd->verify(); 2171 } 2172 } 2173 2174 void nmethod::verify_scopes() { 2175 if( !method() ) return; // Runtime stubs have no scope 2176 if (method()->is_native()) return; // Ignore stub methods. 2177 // iterate through all interrupt point 2178 // and verify the debug information is valid. 2179 RelocIterator iter((nmethod*)this); 2180 while (iter.next()) { 2181 address stub = NULL; 2182 switch (iter.type()) { 2183 case relocInfo::virtual_call_type: 2184 verify_interrupt_point(iter.addr()); 2185 break; 2186 case relocInfo::opt_virtual_call_type: 2187 stub = iter.opt_virtual_call_reloc()->static_stub(false); 2188 verify_interrupt_point(iter.addr()); 2189 break; 2190 case relocInfo::static_call_type: 2191 stub = iter.static_call_reloc()->static_stub(false); 2192 //verify_interrupt_point(iter.addr()); 2193 break; 2194 case relocInfo::runtime_call_type: 2195 case relocInfo::runtime_call_w_cp_type: 2196 address destination = iter.reloc()->value(); 2197 // Right now there is no way to find out which entries support 2198 // an interrupt point. It would be nice if we had this 2199 // information in a table. 2200 break; 2201 } 2202 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section"); 2203 } 2204 } 2205 2206 2207 // ----------------------------------------------------------------------------- 2208 // Non-product code 2209 #ifndef PRODUCT 2210 2211 class DebugScavengeRoot: public OopClosure { 2212 nmethod* _nm; 2213 bool _ok; 2214 public: 2215 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { } 2216 bool ok() { return _ok; } 2217 virtual void do_oop(oop* p) { 2218 if ((*p) == NULL || !(*p)->is_scavengable()) return; 2219 if (_ok) { 2220 _nm->print_nmethod(true); 2221 _ok = false; 2222 } 2223 tty->print_cr("*** scavengable oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)", 2224 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm)); 2225 (*p)->print(); 2226 } 2227 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2228 }; 2229 2230 void nmethod::verify_scavenge_root_oops() { 2231 if (UseG1GC) { 2232 return; 2233 } 2234 2235 if (!on_scavenge_root_list()) { 2236 // Actually look inside, to verify the claim that it's clean. 2237 DebugScavengeRoot debug_scavenge_root(this); 2238 oops_do(&debug_scavenge_root); 2239 if (!debug_scavenge_root.ok()) 2240 fatal("found an unadvertised bad scavengable oop in the code cache"); 2241 } 2242 assert(scavenge_root_not_marked(), ""); 2243 } 2244 2245 #endif // PRODUCT 2246 2247 // Printing operations 2248 2249 void nmethod::print() const { 2250 ResourceMark rm; 2251 ttyLocker ttyl; // keep the following output all in one block 2252 2253 tty->print("Compiled method "); 2254 2255 if (is_compiled_by_c1()) { 2256 tty->print("(c1) "); 2257 } else if (is_compiled_by_c2()) { 2258 tty->print("(c2) "); 2259 } else if (is_compiled_by_shark()) { 2260 tty->print("(shark) "); 2261 } else if (is_compiled_by_jvmci()) { 2262 tty->print("(JVMCI) "); 2263 } else { 2264 tty->print("(nm) "); 2265 } 2266 2267 print_on(tty, NULL); 2268 2269 if (WizardMode) { 2270 tty->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this)); 2271 tty->print(" for method " INTPTR_FORMAT , p2i(method())); 2272 tty->print(" { "); 2273 tty->print_cr("%s ", state()); 2274 if (on_scavenge_root_list()) tty->print("scavenge_root "); 2275 tty->print_cr("}:"); 2276 } 2277 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2278 p2i(this), 2279 p2i(this) + size(), 2280 size()); 2281 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2282 p2i(relocation_begin()), 2283 p2i(relocation_end()), 2284 relocation_size()); 2285 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2286 p2i(consts_begin()), 2287 p2i(consts_end()), 2288 consts_size()); 2289 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2290 p2i(insts_begin()), 2291 p2i(insts_end()), 2292 insts_size()); 2293 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2294 p2i(stub_begin()), 2295 p2i(stub_end()), 2296 stub_size()); 2297 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2298 p2i(oops_begin()), 2299 p2i(oops_end()), 2300 oops_size()); 2301 if (metadata_size () > 0) tty->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2302 p2i(metadata_begin()), 2303 p2i(metadata_end()), 2304 metadata_size()); 2305 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2306 p2i(scopes_data_begin()), 2307 p2i(scopes_data_end()), 2308 scopes_data_size()); 2309 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2310 p2i(scopes_pcs_begin()), 2311 p2i(scopes_pcs_end()), 2312 scopes_pcs_size()); 2313 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2314 p2i(dependencies_begin()), 2315 p2i(dependencies_end()), 2316 dependencies_size()); 2317 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2318 p2i(handler_table_begin()), 2319 p2i(handler_table_end()), 2320 handler_table_size()); 2321 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2322 p2i(nul_chk_table_begin()), 2323 p2i(nul_chk_table_end()), 2324 nul_chk_table_size()); 2325 } 2326 2327 #ifndef PRODUCT 2328 2329 void nmethod::print_scopes() { 2330 // Find the first pc desc for all scopes in the code and print it. 2331 ResourceMark rm; 2332 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2333 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null) 2334 continue; 2335 2336 ScopeDesc* sd = scope_desc_at(p->real_pc(this)); 2337 while (sd != NULL) { 2338 sd->print_on(tty, p); 2339 sd = sd->sender(); 2340 } 2341 } 2342 } 2343 2344 void nmethod::print_dependencies() { 2345 ResourceMark rm; 2346 ttyLocker ttyl; // keep the following output all in one block 2347 tty->print_cr("Dependencies:"); 2348 for (Dependencies::DepStream deps(this); deps.next(); ) { 2349 deps.print_dependency(); 2350 Klass* ctxk = deps.context_type(); 2351 if (ctxk != NULL) { 2352 if (ctxk->is_instance_klass() && InstanceKlass::cast(ctxk)->is_dependent_nmethod(this)) { 2353 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name()); 2354 } 2355 } 2356 deps.log_dependency(); // put it into the xml log also 2357 } 2358 } 2359 2360 2361 void nmethod::print_relocations() { 2362 ResourceMark m; // in case methods get printed via the debugger 2363 tty->print_cr("relocations:"); 2364 RelocIterator iter(this); 2365 iter.print(); 2366 if (UseRelocIndex) { 2367 jint* index_end = (jint*)relocation_end() - 1; 2368 jint index_size = *index_end; 2369 jint* index_start = (jint*)( (address)index_end - index_size ); 2370 tty->print_cr(" index @" INTPTR_FORMAT ": index_size=%d", p2i(index_start), index_size); 2371 if (index_size > 0) { 2372 jint* ip; 2373 for (ip = index_start; ip+2 <= index_end; ip += 2) 2374 tty->print_cr(" (%d %d) addr=" INTPTR_FORMAT " @" INTPTR_FORMAT, 2375 ip[0], 2376 ip[1], 2377 p2i(header_end()+ip[0]), 2378 p2i(relocation_begin()-1+ip[1])); 2379 for (; ip < index_end; ip++) 2380 tty->print_cr(" (%d ?)", ip[0]); 2381 tty->print_cr(" @" INTPTR_FORMAT ": index_size=%d", p2i(ip), *ip); 2382 ip++; 2383 tty->print_cr("reloc_end @" INTPTR_FORMAT ":", p2i(ip)); 2384 } 2385 } 2386 } 2387 2388 2389 void nmethod::print_pcs() { 2390 ResourceMark m; // in case methods get printed via debugger 2391 tty->print_cr("pc-bytecode offsets:"); 2392 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2393 p->print(this); 2394 } 2395 } 2396 2397 void nmethod::print_recorded_oops() { 2398 tty->print_cr("Recorded oops:"); 2399 for (int i = 0; i < oops_count(); i++) { 2400 oop o = oop_at(i); 2401 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(o)); 2402 if (o == (oop)Universe::non_oop_word()) { 2403 tty->print("non-oop word"); 2404 } else { 2405 o->print_value(); 2406 } 2407 tty->cr(); 2408 } 2409 } 2410 2411 void nmethod::print_recorded_metadata() { 2412 tty->print_cr("Recorded metadata:"); 2413 for (int i = 0; i < metadata_count(); i++) { 2414 Metadata* m = metadata_at(i); 2415 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(m)); 2416 if (m == (Metadata*)Universe::non_oop_word()) { 2417 tty->print("non-metadata word"); 2418 } else { 2419 m->print_value_on_maybe_null(tty); 2420 } 2421 tty->cr(); 2422 } 2423 } 2424 2425 #endif // PRODUCT 2426 2427 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) { 2428 RelocIterator iter(this, begin, end); 2429 bool have_one = false; 2430 while (iter.next()) { 2431 have_one = true; 2432 switch (iter.type()) { 2433 case relocInfo::none: return "no_reloc"; 2434 case relocInfo::oop_type: { 2435 stringStream st; 2436 oop_Relocation* r = iter.oop_reloc(); 2437 oop obj = r->oop_value(); 2438 st.print("oop("); 2439 if (obj == NULL) st.print("NULL"); 2440 else obj->print_value_on(&st); 2441 st.print(")"); 2442 return st.as_string(); 2443 } 2444 case relocInfo::metadata_type: { 2445 stringStream st; 2446 metadata_Relocation* r = iter.metadata_reloc(); 2447 Metadata* obj = r->metadata_value(); 2448 st.print("metadata("); 2449 if (obj == NULL) st.print("NULL"); 2450 else obj->print_value_on(&st); 2451 st.print(")"); 2452 return st.as_string(); 2453 } 2454 case relocInfo::runtime_call_type: 2455 case relocInfo::runtime_call_w_cp_type: { 2456 stringStream st; 2457 st.print("runtime_call"); 2458 CallRelocation* r = (CallRelocation*)iter.reloc(); 2459 address dest = r->destination(); 2460 CodeBlob* cb = CodeCache::find_blob(dest); 2461 if (cb != NULL) { 2462 st.print(" %s", cb->name()); 2463 } else { 2464 ResourceMark rm; 2465 const int buflen = 1024; 2466 char* buf = NEW_RESOURCE_ARRAY(char, buflen); 2467 int offset; 2468 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) { 2469 st.print(" %s", buf); 2470 if (offset != 0) { 2471 st.print("+%d", offset); 2472 } 2473 } 2474 } 2475 return st.as_string(); 2476 } 2477 case relocInfo::virtual_call_type: { 2478 stringStream st; 2479 st.print_raw("virtual_call"); 2480 virtual_call_Relocation* r = iter.virtual_call_reloc(); 2481 Method* m = r->method_value(); 2482 if (m != NULL) { 2483 assert(m->is_method(), ""); 2484 m->print_short_name(&st); 2485 } 2486 return st.as_string(); 2487 } 2488 case relocInfo::opt_virtual_call_type: { 2489 stringStream st; 2490 st.print_raw("optimized virtual_call"); 2491 opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc(); 2492 Method* m = r->method_value(); 2493 if (m != NULL) { 2494 assert(m->is_method(), ""); 2495 m->print_short_name(&st); 2496 } 2497 return st.as_string(); 2498 } 2499 case relocInfo::static_call_type: { 2500 stringStream st; 2501 st.print_raw("static_call"); 2502 static_call_Relocation* r = iter.static_call_reloc(); 2503 Method* m = r->method_value(); 2504 if (m != NULL) { 2505 assert(m->is_method(), ""); 2506 m->print_short_name(&st); 2507 } 2508 return st.as_string(); 2509 } 2510 case relocInfo::static_stub_type: return "static_stub"; 2511 case relocInfo::external_word_type: return "external_word"; 2512 case relocInfo::internal_word_type: return "internal_word"; 2513 case relocInfo::section_word_type: return "section_word"; 2514 case relocInfo::poll_type: return "poll"; 2515 case relocInfo::poll_return_type: return "poll_return"; 2516 case relocInfo::type_mask: return "type_bit_mask"; 2517 } 2518 } 2519 return have_one ? "other" : NULL; 2520 } 2521 2522 // Return a the last scope in (begin..end] 2523 ScopeDesc* nmethod::scope_desc_in(address begin, address end) { 2524 PcDesc* p = pc_desc_near(begin+1); 2525 if (p != NULL && p->real_pc(this) <= end) { 2526 return new ScopeDesc(this, p->scope_decode_offset(), 2527 p->obj_decode_offset(), p->should_reexecute(), p->rethrow_exception(), 2528 p->return_oop()); 2529 } 2530 return NULL; 2531 } 2532 2533 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const { 2534 if (block_begin == entry_point()) stream->print_cr("[Entry Point]"); 2535 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]"); 2536 if (JVMCI_ONLY(_exception_offset >= 0 &&) block_begin == exception_begin()) stream->print_cr("[Exception Handler]"); 2537 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]"); 2538 if (JVMCI_ONLY(_deopt_handler_begin != NULL &&) block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]"); 2539 2540 if (has_method_handle_invokes()) 2541 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]"); 2542 2543 if (block_begin == consts_begin()) stream->print_cr("[Constants]"); 2544 2545 if (block_begin == entry_point()) { 2546 methodHandle m = method(); 2547 if (m.not_null()) { 2548 stream->print(" # "); 2549 m->print_value_on(stream); 2550 stream->cr(); 2551 } 2552 if (m.not_null() && !is_osr_method()) { 2553 ResourceMark rm; 2554 int sizeargs = m->size_of_parameters(); 2555 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs); 2556 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs); 2557 { 2558 int sig_index = 0; 2559 if (!m->is_static()) 2560 sig_bt[sig_index++] = T_OBJECT; // 'this' 2561 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) { 2562 BasicType t = ss.type(); 2563 sig_bt[sig_index++] = t; 2564 if (type2size[t] == 2) { 2565 sig_bt[sig_index++] = T_VOID; 2566 } else { 2567 assert(type2size[t] == 1, "size is 1 or 2"); 2568 } 2569 } 2570 assert(sig_index == sizeargs, ""); 2571 } 2572 const char* spname = "sp"; // make arch-specific? 2573 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false); 2574 int stack_slot_offset = this->frame_size() * wordSize; 2575 int tab1 = 14, tab2 = 24; 2576 int sig_index = 0; 2577 int arg_index = (m->is_static() ? 0 : -1); 2578 bool did_old_sp = false; 2579 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) { 2580 bool at_this = (arg_index == -1); 2581 bool at_old_sp = false; 2582 BasicType t = (at_this ? T_OBJECT : ss.type()); 2583 assert(t == sig_bt[sig_index], "sigs in sync"); 2584 if (at_this) 2585 stream->print(" # this: "); 2586 else 2587 stream->print(" # parm%d: ", arg_index); 2588 stream->move_to(tab1); 2589 VMReg fst = regs[sig_index].first(); 2590 VMReg snd = regs[sig_index].second(); 2591 if (fst->is_reg()) { 2592 stream->print("%s", fst->name()); 2593 if (snd->is_valid()) { 2594 stream->print(":%s", snd->name()); 2595 } 2596 } else if (fst->is_stack()) { 2597 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset; 2598 if (offset == stack_slot_offset) at_old_sp = true; 2599 stream->print("[%s+0x%x]", spname, offset); 2600 } else { 2601 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd); 2602 } 2603 stream->print(" "); 2604 stream->move_to(tab2); 2605 stream->print("= "); 2606 if (at_this) { 2607 m->method_holder()->print_value_on(stream); 2608 } else { 2609 bool did_name = false; 2610 if (!at_this && ss.is_object()) { 2611 Symbol* name = ss.as_symbol_or_null(); 2612 if (name != NULL) { 2613 name->print_value_on(stream); 2614 did_name = true; 2615 } 2616 } 2617 if (!did_name) 2618 stream->print("%s", type2name(t)); 2619 } 2620 if (at_old_sp) { 2621 stream->print(" (%s of caller)", spname); 2622 did_old_sp = true; 2623 } 2624 stream->cr(); 2625 sig_index += type2size[t]; 2626 arg_index += 1; 2627 if (!at_this) ss.next(); 2628 } 2629 if (!did_old_sp) { 2630 stream->print(" # "); 2631 stream->move_to(tab1); 2632 stream->print("[%s+0x%x]", spname, stack_slot_offset); 2633 stream->print(" (%s of caller)", spname); 2634 stream->cr(); 2635 } 2636 } 2637 } 2638 } 2639 2640 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) { 2641 // First, find an oopmap in (begin, end]. 2642 // We use the odd half-closed interval so that oop maps and scope descs 2643 // which are tied to the byte after a call are printed with the call itself. 2644 address base = code_begin(); 2645 ImmutableOopMapSet* oms = oop_maps(); 2646 if (oms != NULL) { 2647 for (int i = 0, imax = oms->count(); i < imax; i++) { 2648 const ImmutableOopMapPair* pair = oms->pair_at(i); 2649 const ImmutableOopMap* om = pair->get_from(oms); 2650 address pc = base + pair->pc_offset(); 2651 if (pc > begin) { 2652 if (pc <= end) { 2653 st->move_to(column); 2654 st->print("; "); 2655 om->print_on(st); 2656 } 2657 break; 2658 } 2659 } 2660 } 2661 2662 // Print any debug info present at this pc. 2663 ScopeDesc* sd = scope_desc_in(begin, end); 2664 if (sd != NULL) { 2665 st->move_to(column); 2666 if (sd->bci() == SynchronizationEntryBCI) { 2667 st->print(";*synchronization entry"); 2668 } else { 2669 if (sd->method() == NULL) { 2670 st->print("method is NULL"); 2671 } else if (sd->method()->is_native()) { 2672 st->print("method is native"); 2673 } else { 2674 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci()); 2675 st->print(";*%s", Bytecodes::name(bc)); 2676 switch (bc) { 2677 case Bytecodes::_invokevirtual: 2678 case Bytecodes::_invokespecial: 2679 case Bytecodes::_invokestatic: 2680 case Bytecodes::_invokeinterface: 2681 { 2682 Bytecode_invoke invoke(sd->method(), sd->bci()); 2683 st->print(" "); 2684 if (invoke.name() != NULL) 2685 invoke.name()->print_symbol_on(st); 2686 else 2687 st->print("<UNKNOWN>"); 2688 break; 2689 } 2690 case Bytecodes::_getfield: 2691 case Bytecodes::_putfield: 2692 case Bytecodes::_getstatic: 2693 case Bytecodes::_putstatic: 2694 { 2695 Bytecode_field field(sd->method(), sd->bci()); 2696 st->print(" "); 2697 if (field.name() != NULL) 2698 field.name()->print_symbol_on(st); 2699 else 2700 st->print("<UNKNOWN>"); 2701 } 2702 } 2703 } 2704 st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop()); 2705 } 2706 2707 // Print all scopes 2708 for (;sd != NULL; sd = sd->sender()) { 2709 st->move_to(column); 2710 st->print("; -"); 2711 if (sd->method() == NULL) { 2712 st->print("method is NULL"); 2713 } else { 2714 sd->method()->print_short_name(st); 2715 } 2716 int lineno = sd->method()->line_number_from_bci(sd->bci()); 2717 if (lineno != -1) { 2718 st->print("@%d (line %d)", sd->bci(), lineno); 2719 } else { 2720 st->print("@%d", sd->bci()); 2721 } 2722 st->cr(); 2723 } 2724 } 2725 2726 // Print relocation information 2727 const char* str = reloc_string_for(begin, end); 2728 if (str != NULL) { 2729 if (sd != NULL) st->cr(); 2730 st->move_to(column); 2731 st->print("; {%s}", str); 2732 } 2733 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin()); 2734 if (cont_offset != 0) { 2735 st->move_to(column); 2736 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset)); 2737 } 2738 2739 } 2740 2741 class DirectNativeCallWrapper: public NativeCallWrapper { 2742 private: 2743 NativeCall* _call; 2744 2745 public: 2746 DirectNativeCallWrapper(NativeCall* call) : _call(call) {} 2747 2748 virtual address destination() const { return _call->destination(); } 2749 virtual address instruction_address() const { return _call->instruction_address(); } 2750 virtual address next_instruction_address() const { return _call->next_instruction_address(); } 2751 virtual address return_address() const { return _call->return_address(); } 2752 2753 virtual address get_resolve_call_stub(bool is_optimized) const { 2754 if (is_optimized) { 2755 return SharedRuntime::get_resolve_opt_virtual_call_stub(); 2756 } 2757 return SharedRuntime::get_resolve_virtual_call_stub(); 2758 } 2759 2760 virtual void set_destination_mt_safe(address dest) { 2761 #if INCLUDE_AOT 2762 if (UseAOT) { 2763 CodeBlob* callee = CodeCache::find_blob(dest); 2764 CompiledMethod* cm = callee->as_compiled_method_or_null(); 2765 if (cm != NULL && cm->is_far_code()) { 2766 // Temporary fix, see JDK-8143106 2767 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address()); 2768 csc->set_to_far(methodHandle(cm->method()), dest); 2769 return; 2770 } 2771 } 2772 #endif 2773 _call->set_destination_mt_safe(dest); 2774 } 2775 2776 virtual void set_to_interpreted(const methodHandle& method, CompiledICInfo& info) { 2777 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address()); 2778 #if INCLUDE_AOT 2779 if (info.to_aot()) { 2780 csc->set_to_far(method, info.entry()); 2781 } else 2782 #endif 2783 { 2784 csc->set_to_interpreted(method, info.entry()); 2785 } 2786 } 2787 2788 virtual void verify() const { 2789 // make sure code pattern is actually a call imm32 instruction 2790 _call->verify(); 2791 if (os::is_MP()) { 2792 _call->verify_alignment(); 2793 } 2794 } 2795 2796 virtual void verify_resolve_call(address dest) const { 2797 CodeBlob* db = CodeCache::find_blob_unsafe(dest); 2798 assert(!db->is_adapter_blob(), "must use stub!"); 2799 } 2800 2801 virtual bool is_call_to_interpreted(address dest) const { 2802 CodeBlob* cb = CodeCache::find_blob(_call->instruction_address()); 2803 return cb->contains(dest); 2804 } 2805 2806 virtual bool is_safe_for_patching() const { return false; } 2807 2808 virtual NativeInstruction* get_load_instruction(virtual_call_Relocation* r) const { 2809 return nativeMovConstReg_at(r->cached_value()); 2810 } 2811 2812 virtual void *get_data(NativeInstruction* instruction) const { 2813 return (void*)((NativeMovConstReg*) instruction)->data(); 2814 } 2815 2816 virtual void set_data(NativeInstruction* instruction, intptr_t data) { 2817 ((NativeMovConstReg*) instruction)->set_data(data); 2818 } 2819 }; 2820 2821 NativeCallWrapper* nmethod::call_wrapper_at(address call) const { 2822 return new DirectNativeCallWrapper((NativeCall*) call); 2823 } 2824 2825 NativeCallWrapper* nmethod::call_wrapper_before(address return_pc) const { 2826 return new DirectNativeCallWrapper(nativeCall_before(return_pc)); 2827 } 2828 2829 address nmethod::call_instruction_address(address pc) const { 2830 if (NativeCall::is_call_before(pc)) { 2831 NativeCall *ncall = nativeCall_before(pc); 2832 return ncall->instruction_address(); 2833 } 2834 return NULL; 2835 } 2836 2837 CompiledStaticCall* nmethod::compiledStaticCall_at(Relocation* call_site) const { 2838 return CompiledDirectStaticCall::at(call_site); 2839 } 2840 2841 CompiledStaticCall* nmethod::compiledStaticCall_at(address call_site) const { 2842 return CompiledDirectStaticCall::at(call_site); 2843 } 2844 2845 CompiledStaticCall* nmethod::compiledStaticCall_before(address return_addr) const { 2846 return CompiledDirectStaticCall::before(return_addr); 2847 } 2848 2849 #ifndef PRODUCT 2850 2851 void nmethod::print_value_on(outputStream* st) const { 2852 st->print("nmethod"); 2853 print_on(st, NULL); 2854 } 2855 2856 void nmethod::print_calls(outputStream* st) { 2857 RelocIterator iter(this); 2858 while (iter.next()) { 2859 switch (iter.type()) { 2860 case relocInfo::virtual_call_type: 2861 case relocInfo::opt_virtual_call_type: { 2862 VerifyMutexLocker mc(CompiledIC_lock); 2863 CompiledIC_at(&iter)->print(); 2864 break; 2865 } 2866 case relocInfo::static_call_type: 2867 st->print_cr("Static call at " INTPTR_FORMAT, p2i(iter.reloc()->addr())); 2868 CompiledDirectStaticCall::at(iter.reloc())->print(); 2869 break; 2870 } 2871 } 2872 } 2873 2874 void nmethod::print_handler_table() { 2875 ExceptionHandlerTable(this).print(); 2876 } 2877 2878 void nmethod::print_nul_chk_table() { 2879 ImplicitExceptionTable(this).print(code_begin()); 2880 } 2881 2882 void nmethod::print_statistics() { 2883 ttyLocker ttyl; 2884 if (xtty != NULL) xtty->head("statistics type='nmethod'"); 2885 native_nmethod_stats.print_native_nmethod_stats(); 2886 #ifdef COMPILER1 2887 c1_java_nmethod_stats.print_nmethod_stats("C1"); 2888 #endif 2889 #ifdef COMPILER2 2890 c2_java_nmethod_stats.print_nmethod_stats("C2"); 2891 #endif 2892 #if INCLUDE_JVMCI 2893 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI"); 2894 #endif 2895 #ifdef SHARK 2896 shark_java_nmethod_stats.print_nmethod_stats("Shark"); 2897 #endif 2898 unknown_java_nmethod_stats.print_nmethod_stats("Unknown"); 2899 DebugInformationRecorder::print_statistics(); 2900 #ifndef PRODUCT 2901 pc_nmethod_stats.print_pc_stats(); 2902 #endif 2903 Dependencies::print_statistics(); 2904 if (xtty != NULL) xtty->tail("statistics"); 2905 } 2906 2907 #endif // !PRODUCT 2908 2909 #if INCLUDE_JVMCI 2910 void nmethod::clear_jvmci_installed_code() { 2911 // write_ref_method_pre/post can only be safely called at a 2912 // safepoint or while holding the CodeCache_lock 2913 assert(CodeCache_lock->is_locked() || 2914 SafepointSynchronize::is_at_safepoint(), "should be performed under a lock for consistency"); 2915 if (_jvmci_installed_code != NULL) { 2916 // This must be done carefully to maintain nmethod remembered sets properly 2917 BarrierSet* bs = Universe::heap()->barrier_set(); 2918 bs->write_ref_nmethod_pre(&_jvmci_installed_code, this); 2919 _jvmci_installed_code = NULL; 2920 bs->write_ref_nmethod_post(&_jvmci_installed_code, this); 2921 } 2922 } 2923 2924 void nmethod::maybe_invalidate_installed_code() { 2925 assert(Patching_lock->is_locked() || 2926 SafepointSynchronize::is_at_safepoint(), "should be performed under a lock for consistency"); 2927 oop installed_code = jvmci_installed_code(); 2928 if (installed_code != NULL) { 2929 nmethod* nm = (nmethod*)InstalledCode::address(installed_code); 2930 if (nm == NULL || nm != this) { 2931 // The link has been broken or the InstalledCode instance is 2932 // associated with another nmethod so do nothing. 2933 return; 2934 } 2935 if (!is_alive()) { 2936 // Break the link between nmethod and InstalledCode such that the nmethod 2937 // can subsequently be flushed safely. The link must be maintained while 2938 // the method could have live activations since invalidateInstalledCode 2939 // might want to invalidate all existing activations. 2940 InstalledCode::set_address(installed_code, 0); 2941 InstalledCode::set_entryPoint(installed_code, 0); 2942 } else if (is_not_entrant()) { 2943 // Remove the entry point so any invocation will fail but keep 2944 // the address link around that so that existing activations can 2945 // be invalidated. 2946 InstalledCode::set_entryPoint(installed_code, 0); 2947 } 2948 } 2949 } 2950 2951 void nmethod::invalidate_installed_code(Handle installedCode, TRAPS) { 2952 if (installedCode() == NULL) { 2953 THROW(vmSymbols::java_lang_NullPointerException()); 2954 } 2955 jlong nativeMethod = InstalledCode::address(installedCode); 2956 nmethod* nm = (nmethod*)nativeMethod; 2957 if (nm == NULL) { 2958 // Nothing to do 2959 return; 2960 } 2961 2962 nmethodLocker nml(nm); 2963 #ifdef ASSERT 2964 { 2965 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 2966 // This relationship can only be checked safely under a lock 2967 assert(nm == NULL || !nm->is_alive() || nm->jvmci_installed_code() == installedCode(), "sanity check"); 2968 } 2969 #endif 2970 2971 if (nm->is_alive()) { 2972 // The nmethod state machinery maintains the link between the 2973 // HotSpotInstalledCode and nmethod* so as long as the nmethod appears to be 2974 // alive assume there is work to do and deoptimize the nmethod. 2975 nm->mark_for_deoptimization(); 2976 VM_Deoptimize op; 2977 VMThread::execute(&op); 2978 } 2979 2980 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 2981 // Check that it's still associated with the same nmethod and break 2982 // the link if it is. 2983 if (InstalledCode::address(installedCode) == nativeMethod) { 2984 InstalledCode::set_address(installedCode, 0); 2985 } 2986 } 2987 2988 char* nmethod::jvmci_installed_code_name(char* buf, size_t buflen) { 2989 if (!this->is_compiled_by_jvmci()) { 2990 return NULL; 2991 } 2992 oop installedCode = this->jvmci_installed_code(); 2993 if (installedCode != NULL) { 2994 oop installedCodeName = NULL; 2995 if (installedCode->is_a(InstalledCode::klass())) { 2996 installedCodeName = InstalledCode::name(installedCode); 2997 } 2998 if (installedCodeName != NULL) { 2999 return java_lang_String::as_utf8_string(installedCodeName, buf, (int)buflen); 3000 } else { 3001 jio_snprintf(buf, buflen, "null"); 3002 return buf; 3003 } 3004 } 3005 jio_snprintf(buf, buflen, "noInstalledCode"); 3006 return buf; 3007 } 3008 #endif 3009