1 /* 2 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "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 "logging/logStream.hpp" 41 #include "memory/resourceArea.hpp" 42 #include "oops/methodData.hpp" 43 #include "oops/oop.inline.hpp" 44 #include "prims/jvm.h" 45 #include "prims/jvmtiImpl.hpp" 46 #include "runtime/atomic.hpp" 47 #include "runtime/orderAccess.inline.hpp" 48 #include "runtime/os.hpp" 49 #include "runtime/sharedRuntime.hpp" 50 #include "runtime/sweeper.hpp" 51 #include "utilities/align.hpp" 52 #include "utilities/dtrace.hpp" 53 #include "utilities/events.hpp" 54 #include "utilities/resourceHash.hpp" 55 #include "utilities/xmlstream.hpp" 56 #ifdef SHARK 57 #include "shark/sharkCompiler.hpp" 58 #endif 59 #if INCLUDE_JVMCI 60 #include "jvmci/jvmciJavaClasses.hpp" 61 #endif 62 63 #ifdef DTRACE_ENABLED 64 65 // Only bother with this argument setup if dtrace is available 66 67 #define DTRACE_METHOD_UNLOAD_PROBE(method) \ 68 { \ 69 Method* m = (method); \ 70 if (m != NULL) { \ 71 Symbol* klass_name = m->klass_name(); \ 72 Symbol* name = m->name(); \ 73 Symbol* signature = m->signature(); \ 74 HOTSPOT_COMPILED_METHOD_UNLOAD( \ 75 (char *) klass_name->bytes(), klass_name->utf8_length(), \ 76 (char *) name->bytes(), name->utf8_length(), \ 77 (char *) signature->bytes(), signature->utf8_length()); \ 78 } \ 79 } 80 81 #else // ndef DTRACE_ENABLED 82 83 #define DTRACE_METHOD_UNLOAD_PROBE(method) 84 85 #endif 86 87 //--------------------------------------------------------------------------------- 88 // NMethod statistics 89 // They are printed under various flags, including: 90 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation. 91 // (In the latter two cases, they like other stats are printed to the log only.) 92 93 #ifndef PRODUCT 94 // These variables are put into one block to reduce relocations 95 // and make it simpler to print from the debugger. 96 struct java_nmethod_stats_struct { 97 int nmethod_count; 98 int total_size; 99 int relocation_size; 100 int consts_size; 101 int insts_size; 102 int stub_size; 103 int scopes_data_size; 104 int scopes_pcs_size; 105 int dependencies_size; 106 int handler_table_size; 107 int nul_chk_table_size; 108 int oops_size; 109 int metadata_size; 110 111 void note_nmethod(nmethod* nm) { 112 nmethod_count += 1; 113 total_size += nm->size(); 114 relocation_size += nm->relocation_size(); 115 consts_size += nm->consts_size(); 116 insts_size += nm->insts_size(); 117 stub_size += nm->stub_size(); 118 oops_size += nm->oops_size(); 119 metadata_size += nm->metadata_size(); 120 scopes_data_size += nm->scopes_data_size(); 121 scopes_pcs_size += nm->scopes_pcs_size(); 122 dependencies_size += nm->dependencies_size(); 123 handler_table_size += nm->handler_table_size(); 124 nul_chk_table_size += nm->nul_chk_table_size(); 125 } 126 void print_nmethod_stats(const char* name) { 127 if (nmethod_count == 0) return; 128 tty->print_cr("Statistics for %d bytecoded nmethods for %s:", nmethod_count, name); 129 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size); 130 if (nmethod_count != 0) tty->print_cr(" header = " SIZE_FORMAT, nmethod_count * sizeof(nmethod)); 131 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size); 132 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size); 133 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size); 134 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size); 135 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size); 136 if (metadata_size != 0) tty->print_cr(" metadata = %d", metadata_size); 137 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size); 138 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size); 139 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size); 140 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size); 141 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size); 142 } 143 }; 144 145 struct native_nmethod_stats_struct { 146 int native_nmethod_count; 147 int native_total_size; 148 int native_relocation_size; 149 int native_insts_size; 150 int native_oops_size; 151 int native_metadata_size; 152 void note_native_nmethod(nmethod* nm) { 153 native_nmethod_count += 1; 154 native_total_size += nm->size(); 155 native_relocation_size += nm->relocation_size(); 156 native_insts_size += nm->insts_size(); 157 native_oops_size += nm->oops_size(); 158 native_metadata_size += nm->metadata_size(); 159 } 160 void print_native_nmethod_stats() { 161 if (native_nmethod_count == 0) return; 162 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count); 163 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size); 164 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size); 165 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size); 166 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size); 167 if (native_metadata_size != 0) tty->print_cr(" N. metadata = %d", native_metadata_size); 168 } 169 }; 170 171 struct pc_nmethod_stats_struct { 172 int pc_desc_resets; // number of resets (= number of caches) 173 int pc_desc_queries; // queries to nmethod::find_pc_desc 174 int pc_desc_approx; // number of those which have approximate true 175 int pc_desc_repeats; // number of _pc_descs[0] hits 176 int pc_desc_hits; // number of LRU cache hits 177 int pc_desc_tests; // total number of PcDesc examinations 178 int pc_desc_searches; // total number of quasi-binary search steps 179 int pc_desc_adds; // number of LUR cache insertions 180 181 void print_pc_stats() { 182 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query", 183 pc_desc_queries, 184 (double)(pc_desc_tests + pc_desc_searches) 185 / pc_desc_queries); 186 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d", 187 pc_desc_resets, 188 pc_desc_queries, pc_desc_approx, 189 pc_desc_repeats, pc_desc_hits, 190 pc_desc_tests, pc_desc_searches, pc_desc_adds); 191 } 192 }; 193 194 #ifdef COMPILER1 195 static java_nmethod_stats_struct c1_java_nmethod_stats; 196 #endif 197 #ifdef COMPILER2 198 static java_nmethod_stats_struct c2_java_nmethod_stats; 199 #endif 200 #if INCLUDE_JVMCI 201 static java_nmethod_stats_struct jvmci_java_nmethod_stats; 202 #endif 203 #ifdef SHARK 204 static java_nmethod_stats_struct shark_java_nmethod_stats; 205 #endif 206 static java_nmethod_stats_struct unknown_java_nmethod_stats; 207 208 static native_nmethod_stats_struct native_nmethod_stats; 209 static pc_nmethod_stats_struct pc_nmethod_stats; 210 211 static void note_java_nmethod(nmethod* nm) { 212 #ifdef COMPILER1 213 if (nm->is_compiled_by_c1()) { 214 c1_java_nmethod_stats.note_nmethod(nm); 215 } else 216 #endif 217 #ifdef COMPILER2 218 if (nm->is_compiled_by_c2()) { 219 c2_java_nmethod_stats.note_nmethod(nm); 220 } else 221 #endif 222 #if INCLUDE_JVMCI 223 if (nm->is_compiled_by_jvmci()) { 224 jvmci_java_nmethod_stats.note_nmethod(nm); 225 } else 226 #endif 227 #ifdef SHARK 228 if (nm->is_compiled_by_shark()) { 229 shark_java_nmethod_stats.note_nmethod(nm); 230 } else 231 #endif 232 { 233 unknown_java_nmethod_stats.note_nmethod(nm); 234 } 235 } 236 #endif // !PRODUCT 237 238 //--------------------------------------------------------------------------------- 239 240 241 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) { 242 assert(pc != NULL, "Must be non null"); 243 assert(exception.not_null(), "Must be non null"); 244 assert(handler != NULL, "Must be non null"); 245 246 _count = 0; 247 _exception_type = exception->klass(); 248 _next = NULL; 249 250 add_address_and_handler(pc,handler); 251 } 252 253 254 address ExceptionCache::match(Handle exception, address pc) { 255 assert(pc != NULL,"Must be non null"); 256 assert(exception.not_null(),"Must be non null"); 257 if (exception->klass() == exception_type()) { 258 return (test_address(pc)); 259 } 260 261 return NULL; 262 } 263 264 265 bool ExceptionCache::match_exception_with_space(Handle exception) { 266 assert(exception.not_null(),"Must be non null"); 267 if (exception->klass() == exception_type() && count() < cache_size) { 268 return true; 269 } 270 return false; 271 } 272 273 274 address ExceptionCache::test_address(address addr) { 275 int limit = count(); 276 for (int i = 0; i < limit; i++) { 277 if (pc_at(i) == addr) { 278 return handler_at(i); 279 } 280 } 281 return NULL; 282 } 283 284 285 bool ExceptionCache::add_address_and_handler(address addr, address handler) { 286 if (test_address(addr) == handler) return true; 287 288 int index = count(); 289 if (index < cache_size) { 290 set_pc_at(index, addr); 291 set_handler_at(index, handler); 292 increment_count(); 293 return true; 294 } 295 return false; 296 } 297 298 //----------------------------------------------------------------------------- 299 300 301 // Helper used by both find_pc_desc methods. 302 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) { 303 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_tests); 304 if (!approximate) 305 return pc->pc_offset() == pc_offset; 306 else 307 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset(); 308 } 309 310 void PcDescCache::reset_to(PcDesc* initial_pc_desc) { 311 if (initial_pc_desc == NULL) { 312 _pc_descs[0] = NULL; // native method; no PcDescs at all 313 return; 314 } 315 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_resets); 316 // reset the cache by filling it with benign (non-null) values 317 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel"); 318 for (int i = 0; i < cache_size; i++) 319 _pc_descs[i] = initial_pc_desc; 320 } 321 322 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) { 323 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_queries); 324 NOT_PRODUCT(if (approximate) ++pc_nmethod_stats.pc_desc_approx); 325 326 // Note: one might think that caching the most recently 327 // read value separately would be a win, but one would be 328 // wrong. When many threads are updating it, the cache 329 // line it's in would bounce between caches, negating 330 // any benefit. 331 332 // In order to prevent race conditions do not load cache elements 333 // repeatedly, but use a local copy: 334 PcDesc* res; 335 336 // Step one: Check the most recently added value. 337 res = _pc_descs[0]; 338 if (res == NULL) return NULL; // native method; no PcDescs at all 339 if (match_desc(res, pc_offset, approximate)) { 340 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_repeats); 341 return res; 342 } 343 344 // Step two: Check the rest of the LRU cache. 345 for (int i = 1; i < cache_size; ++i) { 346 res = _pc_descs[i]; 347 if (res->pc_offset() < 0) break; // optimization: skip empty cache 348 if (match_desc(res, pc_offset, approximate)) { 349 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_hits); 350 return res; 351 } 352 } 353 354 // Report failure. 355 return NULL; 356 } 357 358 void PcDescCache::add_pc_desc(PcDesc* pc_desc) { 359 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_adds); 360 // Update the LRU cache by shifting pc_desc forward. 361 for (int i = 0; i < cache_size; i++) { 362 PcDesc* next = _pc_descs[i]; 363 _pc_descs[i] = pc_desc; 364 pc_desc = next; 365 } 366 } 367 368 // adjust pcs_size so that it is a multiple of both oopSize and 369 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple 370 // of oopSize, then 2*sizeof(PcDesc) is) 371 static int adjust_pcs_size(int pcs_size) { 372 int nsize = align_up(pcs_size, oopSize); 373 if ((nsize % sizeof(PcDesc)) != 0) { 374 nsize = pcs_size + sizeof(PcDesc); 375 } 376 assert((nsize % oopSize) == 0, "correct alignment"); 377 return nsize; 378 } 379 380 381 int nmethod::total_size() const { 382 return 383 consts_size() + 384 insts_size() + 385 stub_size() + 386 scopes_data_size() + 387 scopes_pcs_size() + 388 handler_table_size() + 389 nul_chk_table_size(); 390 } 391 392 const char* nmethod::compile_kind() const { 393 if (is_osr_method()) return "osr"; 394 if (method() != NULL && is_native_method()) return "c2n"; 395 return NULL; 396 } 397 398 // Fill in default values for various flag fields 399 void nmethod::init_defaults() { 400 _state = in_use; 401 _has_flushed_dependencies = 0; 402 _lock_count = 0; 403 _stack_traversal_mark = 0; 404 _unload_reported = false; // jvmti state 405 _is_far_code = false; // nmethods are located in CodeCache 406 407 #ifdef ASSERT 408 _oops_are_stale = false; 409 #endif 410 411 _oops_do_mark_link = NULL; 412 _jmethod_id = NULL; 413 _osr_link = NULL; 414 if (UseG1GC) { 415 _unloading_next = NULL; 416 } else { 417 _scavenge_root_link = NULL; 418 } 419 _scavenge_root_state = 0; 420 #if INCLUDE_RTM_OPT 421 _rtm_state = NoRTM; 422 #endif 423 #if INCLUDE_JVMCI 424 _jvmci_installed_code = NULL; 425 _speculation_log = NULL; 426 #endif 427 } 428 429 nmethod* nmethod::new_native_nmethod(const methodHandle& method, 430 int compile_id, 431 CodeBuffer *code_buffer, 432 int vep_offset, 433 int frame_complete, 434 int frame_size, 435 ByteSize basic_lock_owner_sp_offset, 436 ByteSize basic_lock_sp_offset, 437 OopMapSet* oop_maps) { 438 code_buffer->finalize_oop_references(method); 439 // create nmethod 440 nmethod* nm = NULL; 441 { 442 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 443 int native_nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod)); 444 CodeOffsets offsets; 445 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset); 446 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete); 447 nm = new (native_nmethod_size, CompLevel_none) nmethod(method(), compiler_none, native_nmethod_size, 448 compile_id, &offsets, 449 code_buffer, frame_size, 450 basic_lock_owner_sp_offset, 451 basic_lock_sp_offset, oop_maps); 452 NOT_PRODUCT(if (nm != NULL) native_nmethod_stats.note_native_nmethod(nm)); 453 } 454 // verify nmethod 455 debug_only(if (nm) nm->verify();) // might block 456 457 if (nm != NULL) { 458 nm->log_new_nmethod(); 459 } 460 461 return nm; 462 } 463 464 nmethod* nmethod::new_nmethod(const methodHandle& method, 465 int compile_id, 466 int entry_bci, 467 CodeOffsets* offsets, 468 int orig_pc_offset, 469 DebugInformationRecorder* debug_info, 470 Dependencies* dependencies, 471 CodeBuffer* code_buffer, int frame_size, 472 OopMapSet* oop_maps, 473 ExceptionHandlerTable* handler_table, 474 ImplicitExceptionTable* nul_chk_table, 475 AbstractCompiler* compiler, 476 int comp_level 477 #if INCLUDE_JVMCI 478 , Handle installed_code, 479 Handle speculationLog 480 #endif 481 ) 482 { 483 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); 484 code_buffer->finalize_oop_references(method); 485 // create nmethod 486 nmethod* nm = NULL; 487 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 488 int nmethod_size = 489 CodeBlob::allocation_size(code_buffer, sizeof(nmethod)) 490 + adjust_pcs_size(debug_info->pcs_size()) 491 + align_up((int)dependencies->size_in_bytes(), oopSize) 492 + align_up(handler_table->size_in_bytes() , oopSize) 493 + align_up(nul_chk_table->size_in_bytes() , oopSize) 494 + align_up(debug_info->data_size() , oopSize); 495 496 nm = new (nmethod_size, comp_level) 497 nmethod(method(), compiler->type(), nmethod_size, compile_id, entry_bci, offsets, 498 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size, 499 oop_maps, 500 handler_table, 501 nul_chk_table, 502 compiler, 503 comp_level 504 #if INCLUDE_JVMCI 505 , installed_code, 506 speculationLog 507 #endif 508 ); 509 510 if (nm != NULL) { 511 // To make dependency checking during class loading fast, record 512 // the nmethod dependencies in the classes it is dependent on. 513 // This allows the dependency checking code to simply walk the 514 // class hierarchy above the loaded class, checking only nmethods 515 // which are dependent on those classes. The slow way is to 516 // check every nmethod for dependencies which makes it linear in 517 // the number of methods compiled. For applications with a lot 518 // classes the slow way is too slow. 519 for (Dependencies::DepStream deps(nm); deps.next(); ) { 520 if (deps.type() == Dependencies::call_site_target_value) { 521 // CallSite dependencies are managed on per-CallSite instance basis. 522 oop call_site = deps.argument_oop(0); 523 MethodHandles::add_dependent_nmethod(call_site, nm); 524 } else { 525 Klass* klass = deps.context_type(); 526 if (klass == NULL) { 527 continue; // ignore things like evol_method 528 } 529 // record this nmethod as dependent on this klass 530 InstanceKlass::cast(klass)->add_dependent_nmethod(nm); 531 } 532 } 533 NOT_PRODUCT(if (nm != NULL) note_java_nmethod(nm)); 534 } 535 } 536 // Do verification and logging outside CodeCache_lock. 537 if (nm != NULL) { 538 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet. 539 DEBUG_ONLY(nm->verify();) 540 nm->log_new_nmethod(); 541 } 542 return nm; 543 } 544 545 // For native wrappers 546 nmethod::nmethod( 547 Method* method, 548 CompilerType type, 549 int nmethod_size, 550 int compile_id, 551 CodeOffsets* offsets, 552 CodeBuffer* code_buffer, 553 int frame_size, 554 ByteSize basic_lock_owner_sp_offset, 555 ByteSize basic_lock_sp_offset, 556 OopMapSet* oop_maps ) 557 : CompiledMethod(method, "native nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false), 558 _native_receiver_sp_offset(basic_lock_owner_sp_offset), 559 _native_basic_lock_sp_offset(basic_lock_sp_offset) 560 { 561 { 562 int scopes_data_offset = 0; 563 int deoptimize_offset = 0; 564 int deoptimize_mh_offset = 0; 565 566 debug_only(NoSafepointVerifier nsv;) 567 assert_locked_or_safepoint(CodeCache_lock); 568 569 init_defaults(); 570 _entry_bci = InvocationEntryBci; 571 // We have no exception handler or deopt handler make the 572 // values something that will never match a pc like the nmethod vtable entry 573 _exception_offset = 0; 574 _orig_pc_offset = 0; 575 576 _consts_offset = data_offset(); 577 _stub_offset = data_offset(); 578 _oops_offset = data_offset(); 579 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize); 580 scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize); 581 _scopes_pcs_offset = scopes_data_offset; 582 _dependencies_offset = _scopes_pcs_offset; 583 _handler_table_offset = _dependencies_offset; 584 _nul_chk_table_offset = _handler_table_offset; 585 _nmethod_end_offset = _nul_chk_table_offset; 586 _compile_id = compile_id; 587 _comp_level = CompLevel_none; 588 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 589 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 590 _osr_entry_point = NULL; 591 _exception_cache = NULL; 592 _pc_desc_container.reset_to(NULL); 593 _hotness_counter = NMethodSweeper::hotness_counter_reset_val(); 594 595 _scopes_data_begin = (address) this + scopes_data_offset; 596 _deopt_handler_begin = (address) this + deoptimize_offset; 597 _deopt_mh_handler_begin = (address) this + deoptimize_mh_offset; 598 599 code_buffer->copy_code_and_locs_to(this); 600 code_buffer->copy_values_to(this); 601 if (ScavengeRootsInCode) { 602 if (detect_scavenge_root_oops()) { 603 CodeCache::add_scavenge_root_nmethod(this); 604 } 605 Universe::heap()->register_nmethod(this); 606 } 607 debug_only(verify_scavenge_root_oops()); 608 CodeCache::commit(this); 609 } 610 611 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) { 612 ttyLocker ttyl; // keep the following output all in one block 613 // This output goes directly to the tty, not the compiler log. 614 // To enable tools to match it up with the compilation activity, 615 // be sure to tag this tty output with the compile ID. 616 if (xtty != NULL) { 617 xtty->begin_head("print_native_nmethod"); 618 xtty->method(_method); 619 xtty->stamp(); 620 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this); 621 } 622 // print the header part first 623 print(); 624 // then print the requested information 625 if (PrintNativeNMethods) { 626 print_code(); 627 if (oop_maps != NULL) { 628 oop_maps->print(); 629 } 630 } 631 if (PrintRelocations) { 632 print_relocations(); 633 } 634 if (xtty != NULL) { 635 xtty->tail("print_native_nmethod"); 636 } 637 } 638 } 639 640 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () { 641 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level)); 642 } 643 644 nmethod::nmethod( 645 Method* method, 646 CompilerType type, 647 int nmethod_size, 648 int compile_id, 649 int entry_bci, 650 CodeOffsets* offsets, 651 int orig_pc_offset, 652 DebugInformationRecorder* debug_info, 653 Dependencies* dependencies, 654 CodeBuffer *code_buffer, 655 int frame_size, 656 OopMapSet* oop_maps, 657 ExceptionHandlerTable* handler_table, 658 ImplicitExceptionTable* nul_chk_table, 659 AbstractCompiler* compiler, 660 int comp_level 661 #if INCLUDE_JVMCI 662 , Handle installed_code, 663 Handle speculation_log 664 #endif 665 ) 666 : CompiledMethod(method, "nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false), 667 _native_receiver_sp_offset(in_ByteSize(-1)), 668 _native_basic_lock_sp_offset(in_ByteSize(-1)) 669 { 670 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); 671 { 672 debug_only(NoSafepointVerifier nsv;) 673 assert_locked_or_safepoint(CodeCache_lock); 674 675 _deopt_handler_begin = (address) this; 676 _deopt_mh_handler_begin = (address) this; 677 678 init_defaults(); 679 _entry_bci = entry_bci; 680 _compile_id = compile_id; 681 _comp_level = comp_level; 682 _orig_pc_offset = orig_pc_offset; 683 _hotness_counter = NMethodSweeper::hotness_counter_reset_val(); 684 685 // Section offsets 686 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts()); 687 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs()); 688 set_ctable_begin(header_begin() + _consts_offset); 689 690 #if INCLUDE_JVMCI 691 _jvmci_installed_code = installed_code(); 692 _speculation_log = (instanceOop)speculation_log(); 693 694 if (compiler->is_jvmci()) { 695 // JVMCI might not produce any stub sections 696 if (offsets->value(CodeOffsets::Exceptions) != -1) { 697 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions); 698 } else { 699 _exception_offset = -1; 700 } 701 if (offsets->value(CodeOffsets::Deopt) != -1) { 702 _deopt_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::Deopt); 703 } else { 704 _deopt_handler_begin = NULL; 705 } 706 if (offsets->value(CodeOffsets::DeoptMH) != -1) { 707 _deopt_mh_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::DeoptMH); 708 } else { 709 _deopt_mh_handler_begin = NULL; 710 } 711 } else { 712 #endif 713 // Exception handler and deopt handler are in the stub section 714 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set"); 715 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set"); 716 717 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions); 718 _deopt_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::Deopt); 719 if (offsets->value(CodeOffsets::DeoptMH) != -1) { 720 _deopt_mh_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::DeoptMH); 721 } else { 722 _deopt_mh_handler_begin = NULL; 723 #if INCLUDE_JVMCI 724 } 725 #endif 726 } 727 if (offsets->value(CodeOffsets::UnwindHandler) != -1) { 728 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler); 729 } else { 730 _unwind_handler_offset = -1; 731 } 732 733 _oops_offset = data_offset(); 734 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize); 735 int scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize); 736 737 _scopes_pcs_offset = scopes_data_offset + align_up(debug_info->data_size (), oopSize); 738 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size()); 739 _handler_table_offset = _dependencies_offset + align_up((int)dependencies->size_in_bytes (), oopSize); 740 _nul_chk_table_offset = _handler_table_offset + align_up(handler_table->size_in_bytes(), oopSize); 741 _nmethod_end_offset = _nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize); 742 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 743 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 744 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry); 745 _exception_cache = NULL; 746 747 _scopes_data_begin = (address) this + scopes_data_offset; 748 749 _pc_desc_container.reset_to(scopes_pcs_begin()); 750 751 code_buffer->copy_code_and_locs_to(this); 752 // Copy contents of ScopeDescRecorder to nmethod 753 code_buffer->copy_values_to(this); 754 debug_info->copy_to(this); 755 dependencies->copy_to(this); 756 if (ScavengeRootsInCode) { 757 if (detect_scavenge_root_oops()) { 758 CodeCache::add_scavenge_root_nmethod(this); 759 } 760 Universe::heap()->register_nmethod(this); 761 } 762 debug_only(verify_scavenge_root_oops()); 763 764 CodeCache::commit(this); 765 766 // Copy contents of ExceptionHandlerTable to nmethod 767 handler_table->copy_to(this); 768 nul_chk_table->copy_to(this); 769 770 // we use the information of entry points to find out if a method is 771 // static or non static 772 assert(compiler->is_c2() || compiler->is_jvmci() || 773 _method->is_static() == (entry_point() == _verified_entry_point), 774 " entry points must be same for static methods and vice versa"); 775 } 776 } 777 778 // Print a short set of xml attributes to identify this nmethod. The 779 // output should be embedded in some other element. 780 void nmethod::log_identity(xmlStream* log) const { 781 log->print(" compile_id='%d'", compile_id()); 782 const char* nm_kind = compile_kind(); 783 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind); 784 log->print(" compiler='%s'", compiler_name()); 785 if (TieredCompilation) { 786 log->print(" level='%d'", comp_level()); 787 } 788 } 789 790 791 #define LOG_OFFSET(log, name) \ 792 if (p2i(name##_end()) - p2i(name##_begin())) \ 793 log->print(" " XSTR(name) "_offset='" INTX_FORMAT "'" , \ 794 p2i(name##_begin()) - p2i(this)) 795 796 797 void nmethod::log_new_nmethod() const { 798 if (LogCompilation && xtty != NULL) { 799 ttyLocker ttyl; 800 HandleMark hm; 801 xtty->begin_elem("nmethod"); 802 log_identity(xtty); 803 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size()); 804 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this)); 805 806 LOG_OFFSET(xtty, relocation); 807 LOG_OFFSET(xtty, consts); 808 LOG_OFFSET(xtty, insts); 809 LOG_OFFSET(xtty, stub); 810 LOG_OFFSET(xtty, scopes_data); 811 LOG_OFFSET(xtty, scopes_pcs); 812 LOG_OFFSET(xtty, dependencies); 813 LOG_OFFSET(xtty, handler_table); 814 LOG_OFFSET(xtty, nul_chk_table); 815 LOG_OFFSET(xtty, oops); 816 LOG_OFFSET(xtty, metadata); 817 818 xtty->method(method()); 819 xtty->stamp(); 820 xtty->end_elem(); 821 } 822 } 823 824 #undef LOG_OFFSET 825 826 827 // Print out more verbose output usually for a newly created nmethod. 828 void nmethod::print_on(outputStream* st, const char* msg) const { 829 if (st != NULL) { 830 ttyLocker ttyl; 831 if (WizardMode) { 832 CompileTask::print(st, this, msg, /*short_form:*/ true); 833 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this)); 834 } else { 835 CompileTask::print(st, this, msg, /*short_form:*/ false); 836 } 837 } 838 } 839 840 void nmethod::maybe_print_nmethod(DirectiveSet* directive) { 841 bool printnmethods = directive->PrintAssemblyOption || directive->PrintNMethodsOption; 842 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) { 843 print_nmethod(printnmethods); 844 } 845 } 846 847 void nmethod::print_nmethod(bool printmethod) { 848 ttyLocker ttyl; // keep the following output all in one block 849 if (xtty != NULL) { 850 xtty->begin_head("print_nmethod"); 851 xtty->stamp(); 852 xtty->end_head(); 853 } 854 // print the header part first 855 print(); 856 // then print the requested information 857 if (printmethod) { 858 print_code(); 859 print_pcs(); 860 if (oop_maps()) { 861 oop_maps()->print(); 862 } 863 } 864 if (printmethod || PrintDebugInfo || CompilerOracle::has_option_string(_method, "PrintDebugInfo")) { 865 print_scopes(); 866 } 867 if (printmethod || PrintRelocations || CompilerOracle::has_option_string(_method, "PrintRelocations")) { 868 print_relocations(); 869 } 870 if (printmethod || PrintDependencies || CompilerOracle::has_option_string(_method, "PrintDependencies")) { 871 print_dependencies(); 872 } 873 if (printmethod || PrintExceptionHandlers) { 874 print_handler_table(); 875 print_nul_chk_table(); 876 } 877 if (printmethod) { 878 print_recorded_oops(); 879 print_recorded_metadata(); 880 } 881 if (xtty != NULL) { 882 xtty->tail("print_nmethod"); 883 } 884 } 885 886 887 // Promote one word from an assembly-time handle to a live embedded oop. 888 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) { 889 if (handle == NULL || 890 // As a special case, IC oops are initialized to 1 or -1. 891 handle == (jobject) Universe::non_oop_word()) { 892 (*dest) = (oop) handle; 893 } else { 894 (*dest) = JNIHandles::resolve_non_null(handle); 895 } 896 } 897 898 899 // Have to have the same name because it's called by a template 900 void nmethod::copy_values(GrowableArray<jobject>* array) { 901 int length = array->length(); 902 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough"); 903 oop* dest = oops_begin(); 904 for (int index = 0 ; index < length; index++) { 905 initialize_immediate_oop(&dest[index], array->at(index)); 906 } 907 908 // Now we can fix up all the oops in the code. We need to do this 909 // in the code because the assembler uses jobjects as placeholders. 910 // The code and relocations have already been initialized by the 911 // CodeBlob constructor, so it is valid even at this early point to 912 // iterate over relocations and patch the code. 913 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true); 914 } 915 916 void nmethod::copy_values(GrowableArray<Metadata*>* array) { 917 int length = array->length(); 918 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough"); 919 Metadata** dest = metadata_begin(); 920 for (int index = 0 ; index < length; index++) { 921 dest[index] = array->at(index); 922 } 923 } 924 925 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) { 926 // re-patch all oop-bearing instructions, just in case some oops moved 927 RelocIterator iter(this, begin, end); 928 while (iter.next()) { 929 if (iter.type() == relocInfo::oop_type) { 930 oop_Relocation* reloc = iter.oop_reloc(); 931 if (initialize_immediates && reloc->oop_is_immediate()) { 932 oop* dest = reloc->oop_addr(); 933 initialize_immediate_oop(dest, (jobject) *dest); 934 } 935 // Refresh the oop-related bits of this instruction. 936 reloc->fix_oop_relocation(); 937 } else if (iter.type() == relocInfo::metadata_type) { 938 metadata_Relocation* reloc = iter.metadata_reloc(); 939 reloc->fix_metadata_relocation(); 940 } 941 } 942 } 943 944 945 void nmethod::verify_clean_inline_caches() { 946 assert_locked_or_safepoint(CompiledIC_lock); 947 948 // If the method is not entrant or zombie then a JMP is plastered over the 949 // first few bytes. If an oop in the old code was there, that oop 950 // should not get GC'd. Skip the first few bytes of oops on 951 // not-entrant methods. 952 address low_boundary = verified_entry_point(); 953 if (!is_in_use()) { 954 low_boundary += NativeJump::instruction_size; 955 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 956 // This means that the low_boundary is going to be a little too high. 957 // This shouldn't matter, since oops of non-entrant methods are never used. 958 // In fact, why are we bothering to look at oops in a non-entrant method?? 959 } 960 961 ResourceMark rm; 962 RelocIterator iter(this, low_boundary); 963 while(iter.next()) { 964 switch(iter.type()) { 965 case relocInfo::virtual_call_type: 966 case relocInfo::opt_virtual_call_type: { 967 CompiledIC *ic = CompiledIC_at(&iter); 968 // Ok, to lookup references to zombies here 969 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination()); 970 nmethod* nm = cb->as_nmethod_or_null(); 971 if( nm != NULL ) { 972 // Verify that inline caches pointing to both zombie and not_entrant methods are clean 973 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 974 assert(ic->is_clean(), "IC should be clean"); 975 } 976 } 977 break; 978 } 979 case relocInfo::static_call_type: { 980 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc()); 981 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination()); 982 nmethod* nm = cb->as_nmethod_or_null(); 983 if( nm != NULL ) { 984 // Verify that inline caches pointing to both zombie and not_entrant methods are clean 985 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 986 assert(csc->is_clean(), "IC should be clean"); 987 } 988 } 989 break; 990 } 991 default: 992 break; 993 } 994 } 995 } 996 997 // This is a private interface with the sweeper. 998 void nmethod::mark_as_seen_on_stack() { 999 assert(is_alive(), "Must be an alive method"); 1000 // Set the traversal mark to ensure that the sweeper does 2 1001 // cleaning passes before moving to zombie. 1002 set_stack_traversal_mark(NMethodSweeper::traversal_count()); 1003 } 1004 1005 // Tell if a non-entrant method can be converted to a zombie (i.e., 1006 // there are no activations on the stack, not in use by the VM, 1007 // and not in use by the ServiceThread) 1008 bool nmethod::can_convert_to_zombie() { 1009 assert(is_not_entrant(), "must be a non-entrant method"); 1010 1011 // Since the nmethod sweeper only does partial sweep the sweeper's traversal 1012 // count can be greater than the stack traversal count before it hits the 1013 // nmethod for the second time. 1014 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count() && 1015 !is_locked_by_vm(); 1016 } 1017 1018 void nmethod::inc_decompile_count() { 1019 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return; 1020 // Could be gated by ProfileTraps, but do not bother... 1021 Method* m = method(); 1022 if (m == NULL) return; 1023 MethodData* mdo = m->method_data(); 1024 if (mdo == NULL) return; 1025 // There is a benign race here. See comments in methodData.hpp. 1026 mdo->inc_decompile_count(); 1027 } 1028 1029 void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) { 1030 1031 post_compiled_method_unload(); 1032 1033 // Since this nmethod is being unloaded, make sure that dependencies 1034 // recorded in instanceKlasses get flushed and pass non-NULL closure to 1035 // indicate that this work is being done during a GC. 1036 assert(Universe::heap()->is_gc_active(), "should only be called during gc"); 1037 assert(is_alive != NULL, "Should be non-NULL"); 1038 // A non-NULL is_alive closure indicates that this is being called during GC. 1039 flush_dependencies(is_alive); 1040 1041 // Break cycle between nmethod & method 1042 LogTarget(Trace, class, unload) lt; 1043 if (lt.is_enabled()) { 1044 LogStream ls(lt); 1045 ls.print_cr("making nmethod " INTPTR_FORMAT 1046 " unloadable, Method*(" INTPTR_FORMAT 1047 "), cause(" INTPTR_FORMAT ")", 1048 p2i(this), p2i(_method), p2i(cause)); 1049 if (!Universe::heap()->is_gc_active()) 1050 cause->klass()->print_on(&ls); 1051 } 1052 // Unlink the osr method, so we do not look this up again 1053 if (is_osr_method()) { 1054 // Invalidate the osr nmethod only once 1055 if (is_in_use()) { 1056 invalidate_osr_method(); 1057 } 1058 #ifdef ASSERT 1059 if (method() != NULL) { 1060 // Make sure osr nmethod is invalidated, i.e. not on the list 1061 bool found = method()->method_holder()->remove_osr_nmethod(this); 1062 assert(!found, "osr nmethod should have been invalidated"); 1063 } 1064 #endif 1065 } 1066 1067 // If _method is already NULL the Method* is about to be unloaded, 1068 // so we don't have to break the cycle. Note that it is possible to 1069 // have the Method* live here, in case we unload the nmethod because 1070 // it is pointing to some oop (other than the Method*) being unloaded. 1071 if (_method != NULL) { 1072 // OSR methods point to the Method*, but the Method* does not 1073 // point back! 1074 if (_method->code() == this) { 1075 _method->clear_code(); // Break a cycle 1076 } 1077 _method = NULL; // Clear the method of this dead nmethod 1078 } 1079 1080 // Make the class unloaded - i.e., change state and notify sweeper 1081 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); 1082 if (is_in_use()) { 1083 // Transitioning directly from live to unloaded -- so 1084 // we need to force a cache clean-up; remember this 1085 // for later on. 1086 CodeCache::set_needs_cache_clean(true); 1087 } 1088 1089 // Unregister must be done before the state change 1090 Universe::heap()->unregister_nmethod(this); 1091 1092 _state = unloaded; 1093 1094 // Log the unloading. 1095 log_state_change(); 1096 1097 #if INCLUDE_JVMCI 1098 // The method can only be unloaded after the pointer to the installed code 1099 // Java wrapper is no longer alive. Here we need to clear out this weak 1100 // reference to the dead object. Nulling out the reference has to happen 1101 // after the method is unregistered since the original value may be still 1102 // tracked by the rset. 1103 maybe_invalidate_installed_code(); 1104 // Clear these out after the nmethod has been unregistered and any 1105 // updates to the InstalledCode instance have been performed. 1106 _jvmci_installed_code = NULL; 1107 _speculation_log = NULL; 1108 #endif 1109 1110 // The Method* is gone at this point 1111 assert(_method == NULL, "Tautology"); 1112 1113 set_osr_link(NULL); 1114 NMethodSweeper::report_state_change(this); 1115 } 1116 1117 void nmethod::invalidate_osr_method() { 1118 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); 1119 // Remove from list of active nmethods 1120 if (method() != NULL) { 1121 method()->method_holder()->remove_osr_nmethod(this); 1122 } 1123 } 1124 1125 void nmethod::log_state_change() const { 1126 if (LogCompilation) { 1127 if (xtty != NULL) { 1128 ttyLocker ttyl; // keep the following output all in one block 1129 if (_state == unloaded) { 1130 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'", 1131 os::current_thread_id()); 1132 } else { 1133 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s", 1134 os::current_thread_id(), 1135 (_state == zombie ? " zombie='1'" : "")); 1136 } 1137 log_identity(xtty); 1138 xtty->stamp(); 1139 xtty->end_elem(); 1140 } 1141 } 1142 1143 const char *state_msg = _state == zombie ? "made zombie" : "made not entrant"; 1144 CompileTask::print_ul(this, state_msg); 1145 if (PrintCompilation && _state != unloaded) { 1146 print_on(tty, state_msg); 1147 } 1148 } 1149 1150 /** 1151 * Common functionality for both make_not_entrant and make_zombie 1152 */ 1153 bool nmethod::make_not_entrant_or_zombie(unsigned int state) { 1154 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant"); 1155 assert(!is_zombie(), "should not already be a zombie"); 1156 1157 if (_state == state) { 1158 // Avoid taking the lock if already in required state. 1159 // This is safe from races because the state is an end-state, 1160 // which the nmethod cannot back out of once entered. 1161 // No need for fencing either. 1162 return false; 1163 } 1164 1165 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below. 1166 nmethodLocker nml(this); 1167 methodHandle the_method(method()); 1168 NoSafepointVerifier nsv; 1169 1170 // during patching, depending on the nmethod state we must notify the GC that 1171 // code has been unloaded, unregistering it. We cannot do this right while 1172 // holding the Patching_lock because we need to use the CodeCache_lock. This 1173 // would be prone to deadlocks. 1174 // This flag is used to remember whether we need to later lock and unregister. 1175 bool nmethod_needs_unregister = false; 1176 1177 { 1178 // invalidate osr nmethod before acquiring the patching lock since 1179 // they both acquire leaf locks and we don't want a deadlock. 1180 // This logic is equivalent to the logic below for patching the 1181 // verified entry point of regular methods. We check that the 1182 // nmethod is in use to ensure that it is invalidated only once. 1183 if (is_osr_method() && is_in_use()) { 1184 // this effectively makes the osr nmethod not entrant 1185 invalidate_osr_method(); 1186 } 1187 1188 // Enter critical section. Does not block for safepoint. 1189 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 1190 1191 if (_state == state) { 1192 // another thread already performed this transition so nothing 1193 // to do, but return false to indicate this. 1194 return false; 1195 } 1196 1197 // The caller can be calling the method statically or through an inline 1198 // cache call. 1199 if (!is_osr_method() && !is_not_entrant()) { 1200 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(), 1201 SharedRuntime::get_handle_wrong_method_stub()); 1202 } 1203 1204 if (is_in_use() && update_recompile_counts()) { 1205 // It's a true state change, so mark the method as decompiled. 1206 // Do it only for transition from alive. 1207 inc_decompile_count(); 1208 } 1209 1210 // If the state is becoming a zombie, signal to unregister the nmethod with 1211 // the heap. 1212 // This nmethod may have already been unloaded during a full GC. 1213 if ((state == zombie) && !is_unloaded()) { 1214 nmethod_needs_unregister = true; 1215 } 1216 1217 // Must happen before state change. Otherwise we have a race condition in 1218 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately 1219 // transition its state from 'not_entrant' to 'zombie' without having to wait 1220 // for stack scanning. 1221 if (state == not_entrant) { 1222 mark_as_seen_on_stack(); 1223 OrderAccess::storestore(); // _stack_traversal_mark and _state 1224 } 1225 1226 // Change state 1227 _state = state; 1228 1229 // Log the transition once 1230 log_state_change(); 1231 1232 // Invalidate while holding the patching lock 1233 JVMCI_ONLY(maybe_invalidate_installed_code()); 1234 1235 // Remove nmethod from method. 1236 // We need to check if both the _code and _from_compiled_code_entry_point 1237 // refer to this nmethod because there is a race in setting these two fields 1238 // in Method* as seen in bugid 4947125. 1239 // If the vep() points to the zombie nmethod, the memory for the nmethod 1240 // could be flushed and the compiler and vtable stubs could still call 1241 // through it. 1242 if (method() != NULL && (method()->code() == this || 1243 method()->from_compiled_entry() == verified_entry_point())) { 1244 HandleMark hm; 1245 method()->clear_code(false /* already owns Patching_lock */); 1246 } 1247 } // leave critical region under Patching_lock 1248 1249 #ifdef ASSERT 1250 if (is_osr_method() && method() != NULL) { 1251 // Make sure osr nmethod is invalidated, i.e. not on the list 1252 bool found = method()->method_holder()->remove_osr_nmethod(this); 1253 assert(!found, "osr nmethod should have been invalidated"); 1254 } 1255 #endif 1256 1257 // When the nmethod becomes zombie it is no longer alive so the 1258 // dependencies must be flushed. nmethods in the not_entrant 1259 // state will be flushed later when the transition to zombie 1260 // happens or they get unloaded. 1261 if (state == zombie) { 1262 { 1263 // Flushing dependencies must be done before any possible 1264 // safepoint can sneak in, otherwise the oops used by the 1265 // dependency logic could have become stale. 1266 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1267 if (nmethod_needs_unregister) { 1268 Universe::heap()->unregister_nmethod(this); 1269 #ifdef JVMCI 1270 _jvmci_installed_code = NULL; 1271 _speculation_log = NULL; 1272 #endif 1273 } 1274 flush_dependencies(NULL); 1275 } 1276 1277 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload 1278 // event and it hasn't already been reported for this nmethod then 1279 // report it now. The event may have been reported earlier if the GC 1280 // marked it for unloading). JvmtiDeferredEventQueue support means 1281 // we no longer go to a safepoint here. 1282 post_compiled_method_unload(); 1283 1284 #ifdef ASSERT 1285 // It's no longer safe to access the oops section since zombie 1286 // nmethods aren't scanned for GC. 1287 _oops_are_stale = true; 1288 #endif 1289 // the Method may be reclaimed by class unloading now that the 1290 // nmethod is in zombie state 1291 set_method(NULL); 1292 } else { 1293 assert(state == not_entrant, "other cases may need to be handled differently"); 1294 } 1295 1296 if (TraceCreateZombies) { 1297 ResourceMark m; 1298 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"); 1299 } 1300 1301 NMethodSweeper::report_state_change(this); 1302 return true; 1303 } 1304 1305 void nmethod::flush() { 1306 // Note that there are no valid oops in the nmethod anymore. 1307 assert(!is_osr_method() || is_unloaded() || is_zombie(), 1308 "osr nmethod must be unloaded or zombie before flushing"); 1309 assert(is_zombie() || is_osr_method(), "must be a zombie method"); 1310 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed"); 1311 assert_locked_or_safepoint(CodeCache_lock); 1312 1313 // completely deallocate this method 1314 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, p2i(this)); 1315 if (PrintMethodFlushing) { 1316 tty->print_cr("*flushing %s nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT 1317 "/Free CodeCache:" SIZE_FORMAT "Kb", 1318 is_osr_method() ? "osr" : "",_compile_id, p2i(this), CodeCache::blob_count(), 1319 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024); 1320 } 1321 1322 // We need to deallocate any ExceptionCache data. 1323 // Note that we do not need to grab the nmethod lock for this, it 1324 // better be thread safe if we're disposing of it! 1325 ExceptionCache* ec = exception_cache(); 1326 set_exception_cache(NULL); 1327 while(ec != NULL) { 1328 ExceptionCache* next = ec->next(); 1329 delete ec; 1330 ec = next; 1331 } 1332 1333 if (on_scavenge_root_list()) { 1334 CodeCache::drop_scavenge_root_nmethod(this); 1335 } 1336 1337 #ifdef SHARK 1338 ((SharkCompiler *) compiler())->free_compiled_method(insts_begin()); 1339 #endif // SHARK 1340 1341 CodeBlob::flush(); 1342 CodeCache::free(this); 1343 } 1344 1345 // 1346 // Notify all classes this nmethod is dependent on that it is no 1347 // longer dependent. This should only be called in two situations. 1348 // First, when a nmethod transitions to a zombie all dependents need 1349 // to be clear. Since zombification happens at a safepoint there's no 1350 // synchronization issues. The second place is a little more tricky. 1351 // During phase 1 of mark sweep class unloading may happen and as a 1352 // result some nmethods may get unloaded. In this case the flushing 1353 // of dependencies must happen during phase 1 since after GC any 1354 // dependencies in the unloaded nmethod won't be updated, so 1355 // traversing the dependency information in unsafe. In that case this 1356 // function is called with a non-NULL argument and this function only 1357 // notifies instanceKlasses that are reachable 1358 1359 void nmethod::flush_dependencies(BoolObjectClosure* is_alive) { 1360 assert_locked_or_safepoint(CodeCache_lock); 1361 assert(Universe::heap()->is_gc_active() == (is_alive != NULL), 1362 "is_alive is non-NULL if and only if we are called during GC"); 1363 if (!has_flushed_dependencies()) { 1364 set_has_flushed_dependencies(); 1365 for (Dependencies::DepStream deps(this); deps.next(); ) { 1366 if (deps.type() == Dependencies::call_site_target_value) { 1367 // CallSite dependencies are managed on per-CallSite instance basis. 1368 oop call_site = deps.argument_oop(0); 1369 MethodHandles::remove_dependent_nmethod(call_site, this); 1370 } else { 1371 Klass* klass = deps.context_type(); 1372 if (klass == NULL) { 1373 continue; // ignore things like evol_method 1374 } 1375 // During GC the is_alive closure is non-NULL, and is used to 1376 // determine liveness of dependees that need to be updated. 1377 if (is_alive == NULL || klass->is_loader_alive(is_alive)) { 1378 // The GC defers deletion of this entry, since there might be multiple threads 1379 // iterating over the _dependencies graph. Other call paths are single-threaded 1380 // and may delete it immediately. 1381 bool delete_immediately = is_alive == NULL; 1382 InstanceKlass::cast(klass)->remove_dependent_nmethod(this, delete_immediately); 1383 } 1384 } 1385 } 1386 } 1387 } 1388 1389 1390 // If this oop is not live, the nmethod can be unloaded. 1391 bool nmethod::can_unload(BoolObjectClosure* is_alive, oop* root, bool unloading_occurred) { 1392 assert(root != NULL, "just checking"); 1393 oop obj = *root; 1394 if (obj == NULL || is_alive->do_object_b(obj)) { 1395 return false; 1396 } 1397 1398 // If ScavengeRootsInCode is true, an nmethod might be unloaded 1399 // simply because one of its constant oops has gone dead. 1400 // No actual classes need to be unloaded in order for this to occur. 1401 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading"); 1402 make_unloaded(is_alive, obj); 1403 return true; 1404 } 1405 1406 // ------------------------------------------------------------------ 1407 // post_compiled_method_load_event 1408 // new method for install_code() path 1409 // Transfer information from compilation to jvmti 1410 void nmethod::post_compiled_method_load_event() { 1411 1412 Method* moop = method(); 1413 HOTSPOT_COMPILED_METHOD_LOAD( 1414 (char *) moop->klass_name()->bytes(), 1415 moop->klass_name()->utf8_length(), 1416 (char *) moop->name()->bytes(), 1417 moop->name()->utf8_length(), 1418 (char *) moop->signature()->bytes(), 1419 moop->signature()->utf8_length(), 1420 insts_begin(), insts_size()); 1421 1422 if (JvmtiExport::should_post_compiled_method_load() || 1423 JvmtiExport::should_post_compiled_method_unload()) { 1424 get_and_cache_jmethod_id(); 1425 } 1426 1427 if (JvmtiExport::should_post_compiled_method_load()) { 1428 // Let the Service thread (which is a real Java thread) post the event 1429 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); 1430 JvmtiDeferredEventQueue::enqueue( 1431 JvmtiDeferredEvent::compiled_method_load_event(this)); 1432 } 1433 } 1434 1435 jmethodID nmethod::get_and_cache_jmethod_id() { 1436 if (_jmethod_id == NULL) { 1437 // Cache the jmethod_id since it can no longer be looked up once the 1438 // method itself has been marked for unloading. 1439 _jmethod_id = method()->jmethod_id(); 1440 } 1441 return _jmethod_id; 1442 } 1443 1444 void nmethod::post_compiled_method_unload() { 1445 if (unload_reported()) { 1446 // During unloading we transition to unloaded and then to zombie 1447 // and the unloading is reported during the first transition. 1448 return; 1449 } 1450 1451 assert(_method != NULL && !is_unloaded(), "just checking"); 1452 DTRACE_METHOD_UNLOAD_PROBE(method()); 1453 1454 // If a JVMTI agent has enabled the CompiledMethodUnload event then 1455 // post the event. Sometime later this nmethod will be made a zombie 1456 // by the sweeper but the Method* will not be valid at that point. 1457 // If the _jmethod_id is null then no load event was ever requested 1458 // so don't bother posting the unload. The main reason for this is 1459 // that the jmethodID is a weak reference to the Method* so if 1460 // it's being unloaded there's no way to look it up since the weak 1461 // ref will have been cleared. 1462 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) { 1463 assert(!unload_reported(), "already unloaded"); 1464 JvmtiDeferredEvent event = 1465 JvmtiDeferredEvent::compiled_method_unload_event(this, 1466 _jmethod_id, insts_begin()); 1467 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); 1468 JvmtiDeferredEventQueue::enqueue(event); 1469 } 1470 1471 // The JVMTI CompiledMethodUnload event can be enabled or disabled at 1472 // any time. As the nmethod is being unloaded now we mark it has 1473 // having the unload event reported - this will ensure that we don't 1474 // attempt to report the event in the unlikely scenario where the 1475 // event is enabled at the time the nmethod is made a zombie. 1476 set_unload_reported(); 1477 } 1478 1479 bool nmethod::unload_if_dead_at(RelocIterator* iter_at_oop, BoolObjectClosure *is_alive, bool unloading_occurred) { 1480 assert(iter_at_oop->type() == relocInfo::oop_type, "Wrong relocation type"); 1481 1482 oop_Relocation* r = iter_at_oop->oop_reloc(); 1483 // Traverse those oops directly embedded in the code. 1484 // Other oops (oop_index>0) are seen as part of scopes_oops. 1485 assert(1 == (r->oop_is_immediate()) + 1486 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 1487 "oop must be found in exactly one place"); 1488 if (r->oop_is_immediate() && r->oop_value() != NULL) { 1489 // Unload this nmethod if the oop is dead. 1490 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) { 1491 return true;; 1492 } 1493 } 1494 1495 return false; 1496 } 1497 1498 bool nmethod::do_unloading_scopes(BoolObjectClosure* is_alive, bool unloading_occurred) { 1499 // Scopes 1500 for (oop* p = oops_begin(); p < oops_end(); p++) { 1501 if (*p == Universe::non_oop_word()) continue; // skip non-oops 1502 if (can_unload(is_alive, p, unloading_occurred)) { 1503 return true; 1504 } 1505 } 1506 return false; 1507 } 1508 1509 bool nmethod::do_unloading_oops(address low_boundary, BoolObjectClosure* is_alive, bool unloading_occurred) { 1510 // Compiled code 1511 { 1512 RelocIterator iter(this, low_boundary); 1513 while (iter.next()) { 1514 if (iter.type() == relocInfo::oop_type) { 1515 if (unload_if_dead_at(&iter, is_alive, unloading_occurred)) { 1516 return true; 1517 } 1518 } 1519 } 1520 } 1521 1522 return do_unloading_scopes(is_alive, unloading_occurred); 1523 } 1524 1525 #if INCLUDE_JVMCI 1526 bool nmethod::do_unloading_jvmci(BoolObjectClosure* is_alive, bool unloading_occurred) { 1527 bool is_unloaded = false; 1528 // Follow JVMCI method 1529 BarrierSet* bs = Universe::heap()->barrier_set(); 1530 if (_jvmci_installed_code != NULL) { 1531 if (_jvmci_installed_code->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(_jvmci_installed_code)) { 1532 if (!is_alive->do_object_b(_jvmci_installed_code)) { 1533 clear_jvmci_installed_code(); 1534 } 1535 } else { 1536 if (can_unload(is_alive, (oop*)&_jvmci_installed_code, unloading_occurred)) { 1537 return true; 1538 } 1539 } 1540 } 1541 1542 if (_speculation_log != NULL) { 1543 if (!is_alive->do_object_b(_speculation_log)) { 1544 bs->write_ref_nmethod_pre(&_speculation_log, this); 1545 _speculation_log = NULL; 1546 bs->write_ref_nmethod_post(&_speculation_log, this); 1547 } 1548 } 1549 return is_unloaded; 1550 } 1551 #endif 1552 1553 // Iterate over metadata calling this function. Used by RedefineClasses 1554 void nmethod::metadata_do(void f(Metadata*)) { 1555 address low_boundary = verified_entry_point(); 1556 if (is_not_entrant()) { 1557 low_boundary += NativeJump::instruction_size; 1558 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1559 // (See comment above.) 1560 } 1561 { 1562 // Visit all immediate references that are embedded in the instruction stream. 1563 RelocIterator iter(this, low_boundary); 1564 while (iter.next()) { 1565 if (iter.type() == relocInfo::metadata_type ) { 1566 metadata_Relocation* r = iter.metadata_reloc(); 1567 // In this metadata, we must only follow those metadatas directly embedded in 1568 // the code. Other metadatas (oop_index>0) are seen as part of 1569 // the metadata section below. 1570 assert(1 == (r->metadata_is_immediate()) + 1571 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()), 1572 "metadata must be found in exactly one place"); 1573 if (r->metadata_is_immediate() && r->metadata_value() != NULL) { 1574 Metadata* md = r->metadata_value(); 1575 if (md != _method) f(md); 1576 } 1577 } else if (iter.type() == relocInfo::virtual_call_type) { 1578 // Check compiledIC holders associated with this nmethod 1579 CompiledIC *ic = CompiledIC_at(&iter); 1580 if (ic->is_icholder_call()) { 1581 CompiledICHolder* cichk = ic->cached_icholder(); 1582 f(cichk->holder_method()); 1583 f(cichk->holder_klass()); 1584 } else { 1585 Metadata* ic_oop = ic->cached_metadata(); 1586 if (ic_oop != NULL) { 1587 f(ic_oop); 1588 } 1589 } 1590 } 1591 } 1592 } 1593 1594 // Visit the metadata section 1595 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) { 1596 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops 1597 Metadata* md = *p; 1598 f(md); 1599 } 1600 1601 // Visit metadata not embedded in the other places. 1602 if (_method != NULL) f(_method); 1603 } 1604 1605 void nmethod::oops_do(OopClosure* f, bool allow_zombie) { 1606 // make sure the oops ready to receive visitors 1607 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod"); 1608 assert(!is_unloaded(), "should not call follow on unloaded nmethod"); 1609 1610 // If the method is not entrant or zombie then a JMP is plastered over the 1611 // first few bytes. If an oop in the old code was there, that oop 1612 // should not get GC'd. Skip the first few bytes of oops on 1613 // not-entrant methods. 1614 address low_boundary = verified_entry_point(); 1615 if (is_not_entrant()) { 1616 low_boundary += NativeJump::instruction_size; 1617 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1618 // (See comment above.) 1619 } 1620 1621 #if INCLUDE_JVMCI 1622 if (_jvmci_installed_code != NULL) { 1623 f->do_oop((oop*) &_jvmci_installed_code); 1624 } 1625 if (_speculation_log != NULL) { 1626 f->do_oop((oop*) &_speculation_log); 1627 } 1628 #endif 1629 1630 RelocIterator iter(this, low_boundary); 1631 1632 while (iter.next()) { 1633 if (iter.type() == relocInfo::oop_type ) { 1634 oop_Relocation* r = iter.oop_reloc(); 1635 // In this loop, we must only follow those oops directly embedded in 1636 // the code. Other oops (oop_index>0) are seen as part of scopes_oops. 1637 assert(1 == (r->oop_is_immediate()) + 1638 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 1639 "oop must be found in exactly one place"); 1640 if (r->oop_is_immediate() && r->oop_value() != NULL) { 1641 f->do_oop(r->oop_addr()); 1642 } 1643 } 1644 } 1645 1646 // Scopes 1647 // This includes oop constants not inlined in the code stream. 1648 for (oop* p = oops_begin(); p < oops_end(); p++) { 1649 if (*p == Universe::non_oop_word()) continue; // skip non-oops 1650 f->do_oop(p); 1651 } 1652 } 1653 1654 #define NMETHOD_SENTINEL ((nmethod*)badAddress) 1655 1656 nmethod* volatile nmethod::_oops_do_mark_nmethods; 1657 1658 // An nmethod is "marked" if its _mark_link is set non-null. 1659 // Even if it is the end of the linked list, it will have a non-null link value, 1660 // as long as it is on the list. 1661 // This code must be MP safe, because it is used from parallel GC passes. 1662 bool nmethod::test_set_oops_do_mark() { 1663 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called"); 1664 nmethod* observed_mark_link = _oops_do_mark_link; 1665 if (observed_mark_link == NULL) { 1666 // Claim this nmethod for this thread to mark. 1667 if (Atomic::cmpxchg(NMETHOD_SENTINEL, &_oops_do_mark_link, (nmethod*)NULL) == NULL) { 1668 // Atomically append this nmethod (now claimed) to the head of the list: 1669 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods; 1670 for (;;) { 1671 nmethod* required_mark_nmethods = observed_mark_nmethods; 1672 _oops_do_mark_link = required_mark_nmethods; 1673 observed_mark_nmethods = 1674 Atomic::cmpxchg(this, &_oops_do_mark_nmethods, required_mark_nmethods); 1675 if (observed_mark_nmethods == required_mark_nmethods) 1676 break; 1677 } 1678 // Mark was clear when we first saw this guy. 1679 if (TraceScavenge) { print_on(tty, "oops_do, mark"); } 1680 return false; 1681 } 1682 } 1683 // On fall through, another racing thread marked this nmethod before we did. 1684 return true; 1685 } 1686 1687 void nmethod::oops_do_marking_prologue() { 1688 if (TraceScavenge) { tty->print_cr("[oops_do_marking_prologue"); } 1689 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row"); 1690 // We use cmpxchg instead of regular assignment here because the user 1691 // may fork a bunch of threads, and we need them all to see the same state. 1692 nmethod* observed = Atomic::cmpxchg(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, (nmethod*)NULL); 1693 guarantee(observed == NULL, "no races in this sequential code"); 1694 } 1695 1696 void nmethod::oops_do_marking_epilogue() { 1697 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row"); 1698 nmethod* cur = _oops_do_mark_nmethods; 1699 while (cur != NMETHOD_SENTINEL) { 1700 assert(cur != NULL, "not NULL-terminated"); 1701 nmethod* next = cur->_oops_do_mark_link; 1702 cur->_oops_do_mark_link = NULL; 1703 DEBUG_ONLY(cur->verify_oop_relocations()); 1704 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark")); 1705 cur = next; 1706 } 1707 nmethod* required = _oops_do_mark_nmethods; 1708 nmethod* observed = Atomic::cmpxchg((nmethod*)NULL, &_oops_do_mark_nmethods, required); 1709 guarantee(observed == required, "no races in this sequential code"); 1710 if (TraceScavenge) { tty->print_cr("oops_do_marking_epilogue]"); } 1711 } 1712 1713 class DetectScavengeRoot: public OopClosure { 1714 bool _detected_scavenge_root; 1715 public: 1716 DetectScavengeRoot() : _detected_scavenge_root(false) 1717 { NOT_PRODUCT(_print_nm = NULL); } 1718 bool detected_scavenge_root() { return _detected_scavenge_root; } 1719 virtual void do_oop(oop* p) { 1720 if ((*p) != NULL && (*p)->is_scavengable()) { 1721 NOT_PRODUCT(maybe_print(p)); 1722 _detected_scavenge_root = true; 1723 } 1724 } 1725 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 1726 1727 #ifndef PRODUCT 1728 nmethod* _print_nm; 1729 void maybe_print(oop* p) { 1730 if (_print_nm == NULL) return; 1731 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root"); 1732 tty->print_cr("" PTR_FORMAT "[offset=%d] detected scavengable oop " PTR_FORMAT " (found at " PTR_FORMAT ")", 1733 p2i(_print_nm), (int)((intptr_t)p - (intptr_t)_print_nm), 1734 p2i(*p), p2i(p)); 1735 (*p)->print(); 1736 } 1737 #endif //PRODUCT 1738 }; 1739 1740 bool nmethod::detect_scavenge_root_oops() { 1741 DetectScavengeRoot detect_scavenge_root; 1742 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this); 1743 oops_do(&detect_scavenge_root); 1744 return detect_scavenge_root.detected_scavenge_root(); 1745 } 1746 1747 inline bool includes(void* p, void* from, void* to) { 1748 return from <= p && p < to; 1749 } 1750 1751 1752 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) { 1753 assert(count >= 2, "must be sentinel values, at least"); 1754 1755 #ifdef ASSERT 1756 // must be sorted and unique; we do a binary search in find_pc_desc() 1757 int prev_offset = pcs[0].pc_offset(); 1758 assert(prev_offset == PcDesc::lower_offset_limit, 1759 "must start with a sentinel"); 1760 for (int i = 1; i < count; i++) { 1761 int this_offset = pcs[i].pc_offset(); 1762 assert(this_offset > prev_offset, "offsets must be sorted"); 1763 prev_offset = this_offset; 1764 } 1765 assert(prev_offset == PcDesc::upper_offset_limit, 1766 "must end with a sentinel"); 1767 #endif //ASSERT 1768 1769 // Search for MethodHandle invokes and tag the nmethod. 1770 for (int i = 0; i < count; i++) { 1771 if (pcs[i].is_method_handle_invoke()) { 1772 set_has_method_handle_invokes(true); 1773 break; 1774 } 1775 } 1776 assert(has_method_handle_invokes() == (_deopt_mh_handler_begin != NULL), "must have deopt mh handler"); 1777 1778 int size = count * sizeof(PcDesc); 1779 assert(scopes_pcs_size() >= size, "oob"); 1780 memcpy(scopes_pcs_begin(), pcs, size); 1781 1782 // Adjust the final sentinel downward. 1783 PcDesc* last_pc = &scopes_pcs_begin()[count-1]; 1784 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity"); 1785 last_pc->set_pc_offset(content_size() + 1); 1786 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) { 1787 // Fill any rounding gaps with copies of the last record. 1788 last_pc[1] = last_pc[0]; 1789 } 1790 // The following assert could fail if sizeof(PcDesc) is not 1791 // an integral multiple of oopSize (the rounding term). 1792 // If it fails, change the logic to always allocate a multiple 1793 // of sizeof(PcDesc), and fill unused words with copies of *last_pc. 1794 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly"); 1795 } 1796 1797 void nmethod::copy_scopes_data(u_char* buffer, int size) { 1798 assert(scopes_data_size() >= size, "oob"); 1799 memcpy(scopes_data_begin(), buffer, size); 1800 } 1801 1802 #ifdef ASSERT 1803 static PcDesc* linear_search(const PcDescSearch& search, int pc_offset, bool approximate) { 1804 PcDesc* lower = search.scopes_pcs_begin(); 1805 PcDesc* upper = search.scopes_pcs_end(); 1806 lower += 1; // exclude initial sentinel 1807 PcDesc* res = NULL; 1808 for (PcDesc* p = lower; p < upper; p++) { 1809 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc 1810 if (match_desc(p, pc_offset, approximate)) { 1811 if (res == NULL) 1812 res = p; 1813 else 1814 res = (PcDesc*) badAddress; 1815 } 1816 } 1817 return res; 1818 } 1819 #endif 1820 1821 1822 // Finds a PcDesc with real-pc equal to "pc" 1823 PcDesc* PcDescContainer::find_pc_desc_internal(address pc, bool approximate, const PcDescSearch& search) { 1824 address base_address = search.code_begin(); 1825 if ((pc < base_address) || 1826 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) { 1827 return NULL; // PC is wildly out of range 1828 } 1829 int pc_offset = (int) (pc - base_address); 1830 1831 // Check the PcDesc cache if it contains the desired PcDesc 1832 // (This as an almost 100% hit rate.) 1833 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate); 1834 if (res != NULL) { 1835 assert(res == linear_search(search, pc_offset, approximate), "cache ok"); 1836 return res; 1837 } 1838 1839 // Fallback algorithm: quasi-linear search for the PcDesc 1840 // Find the last pc_offset less than the given offset. 1841 // The successor must be the required match, if there is a match at all. 1842 // (Use a fixed radix to avoid expensive affine pointer arithmetic.) 1843 PcDesc* lower = search.scopes_pcs_begin(); 1844 PcDesc* upper = search.scopes_pcs_end(); 1845 upper -= 1; // exclude final sentinel 1846 if (lower >= upper) return NULL; // native method; no PcDescs at all 1847 1848 #define assert_LU_OK \ 1849 /* invariant on lower..upper during the following search: */ \ 1850 assert(lower->pc_offset() < pc_offset, "sanity"); \ 1851 assert(upper->pc_offset() >= pc_offset, "sanity") 1852 assert_LU_OK; 1853 1854 // Use the last successful return as a split point. 1855 PcDesc* mid = _pc_desc_cache.last_pc_desc(); 1856 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 1857 if (mid->pc_offset() < pc_offset) { 1858 lower = mid; 1859 } else { 1860 upper = mid; 1861 } 1862 1863 // Take giant steps at first (4096, then 256, then 16, then 1) 1864 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1); 1865 const int RADIX = (1 << LOG2_RADIX); 1866 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) { 1867 while ((mid = lower + step) < upper) { 1868 assert_LU_OK; 1869 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 1870 if (mid->pc_offset() < pc_offset) { 1871 lower = mid; 1872 } else { 1873 upper = mid; 1874 break; 1875 } 1876 } 1877 assert_LU_OK; 1878 } 1879 1880 // Sneak up on the value with a linear search of length ~16. 1881 while (true) { 1882 assert_LU_OK; 1883 mid = lower + 1; 1884 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 1885 if (mid->pc_offset() < pc_offset) { 1886 lower = mid; 1887 } else { 1888 upper = mid; 1889 break; 1890 } 1891 } 1892 #undef assert_LU_OK 1893 1894 if (match_desc(upper, pc_offset, approximate)) { 1895 assert(upper == linear_search(search, pc_offset, approximate), "search ok"); 1896 _pc_desc_cache.add_pc_desc(upper); 1897 return upper; 1898 } else { 1899 assert(NULL == linear_search(search, pc_offset, approximate), "search ok"); 1900 return NULL; 1901 } 1902 } 1903 1904 1905 void nmethod::check_all_dependencies(DepChange& changes) { 1906 // Checked dependencies are allocated into this ResourceMark 1907 ResourceMark rm; 1908 1909 // Turn off dependency tracing while actually testing dependencies. 1910 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) ); 1911 1912 typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash, 1913 &DependencySignature::equals, 11027> DepTable; 1914 1915 DepTable* table = new DepTable(); 1916 1917 // Iterate over live nmethods and check dependencies of all nmethods that are not 1918 // marked for deoptimization. A particular dependency is only checked once. 1919 NMethodIterator iter; 1920 while(iter.next()) { 1921 nmethod* nm = iter.method(); 1922 // Only notify for live nmethods 1923 if (nm->is_alive() && !nm->is_marked_for_deoptimization()) { 1924 for (Dependencies::DepStream deps(nm); deps.next(); ) { 1925 // Construct abstraction of a dependency. 1926 DependencySignature* current_sig = new DependencySignature(deps); 1927 1928 // Determine if dependency is already checked. table->put(...) returns 1929 // 'true' if the dependency is added (i.e., was not in the hashtable). 1930 if (table->put(*current_sig, 1)) { 1931 if (deps.check_dependency() != NULL) { 1932 // Dependency checking failed. Print out information about the failed 1933 // dependency and finally fail with an assert. We can fail here, since 1934 // dependency checking is never done in a product build. 1935 tty->print_cr("Failed dependency:"); 1936 changes.print(); 1937 nm->print(); 1938 nm->print_dependencies(); 1939 assert(false, "Should have been marked for deoptimization"); 1940 } 1941 } 1942 } 1943 } 1944 } 1945 } 1946 1947 bool nmethod::check_dependency_on(DepChange& changes) { 1948 // What has happened: 1949 // 1) a new class dependee has been added 1950 // 2) dependee and all its super classes have been marked 1951 bool found_check = false; // set true if we are upset 1952 for (Dependencies::DepStream deps(this); deps.next(); ) { 1953 // Evaluate only relevant dependencies. 1954 if (deps.spot_check_dependency_at(changes) != NULL) { 1955 found_check = true; 1956 NOT_DEBUG(break); 1957 } 1958 } 1959 return found_check; 1960 } 1961 1962 bool nmethod::is_evol_dependent_on(Klass* dependee) { 1963 InstanceKlass *dependee_ik = InstanceKlass::cast(dependee); 1964 Array<Method*>* dependee_methods = dependee_ik->methods(); 1965 for (Dependencies::DepStream deps(this); deps.next(); ) { 1966 if (deps.type() == Dependencies::evol_method) { 1967 Method* method = deps.method_argument(0); 1968 for (int j = 0; j < dependee_methods->length(); j++) { 1969 if (dependee_methods->at(j) == method) { 1970 if (log_is_enabled(Debug, redefine, class, nmethod)) { 1971 ResourceMark rm; 1972 log_debug(redefine, class, nmethod) 1973 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)", 1974 _method->method_holder()->external_name(), 1975 _method->name()->as_C_string(), 1976 _method->signature()->as_C_string(), 1977 compile_id(), 1978 method->method_holder()->external_name(), 1979 method->name()->as_C_string(), 1980 method->signature()->as_C_string()); 1981 } 1982 if (TraceDependencies || LogCompilation) 1983 deps.log_dependency(dependee); 1984 return true; 1985 } 1986 } 1987 } 1988 } 1989 return false; 1990 } 1991 1992 // Called from mark_for_deoptimization, when dependee is invalidated. 1993 bool nmethod::is_dependent_on_method(Method* dependee) { 1994 for (Dependencies::DepStream deps(this); deps.next(); ) { 1995 if (deps.type() != Dependencies::evol_method) 1996 continue; 1997 Method* method = deps.method_argument(0); 1998 if (method == dependee) return true; 1999 } 2000 return false; 2001 } 2002 2003 2004 bool nmethod::is_patchable_at(address instr_addr) { 2005 assert(insts_contains(instr_addr), "wrong nmethod used"); 2006 if (is_zombie()) { 2007 // a zombie may never be patched 2008 return false; 2009 } 2010 return true; 2011 } 2012 2013 2014 address nmethod::continuation_for_implicit_exception(address pc) { 2015 // Exception happened outside inline-cache check code => we are inside 2016 // an active nmethod => use cpc to determine a return address 2017 int exception_offset = pc - code_begin(); 2018 int cont_offset = ImplicitExceptionTable(this).at( exception_offset ); 2019 #ifdef ASSERT 2020 if (cont_offset == 0) { 2021 Thread* thread = Thread::current(); 2022 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY 2023 HandleMark hm(thread); 2024 ResourceMark rm(thread); 2025 CodeBlob* cb = CodeCache::find_blob(pc); 2026 assert(cb != NULL && cb == this, ""); 2027 ttyLocker ttyl; 2028 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, p2i(pc)); 2029 print(); 2030 method()->print_codes(); 2031 print_code(); 2032 print_pcs(); 2033 } 2034 #endif 2035 if (cont_offset == 0) { 2036 // Let the normal error handling report the exception 2037 return NULL; 2038 } 2039 return code_begin() + cont_offset; 2040 } 2041 2042 2043 2044 void nmethod_init() { 2045 // make sure you didn't forget to adjust the filler fields 2046 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word"); 2047 } 2048 2049 2050 //------------------------------------------------------------------------------------------- 2051 2052 2053 // QQQ might we make this work from a frame?? 2054 nmethodLocker::nmethodLocker(address pc) { 2055 CodeBlob* cb = CodeCache::find_blob(pc); 2056 guarantee(cb != NULL && cb->is_compiled(), "bad pc for a nmethod found"); 2057 _nm = cb->as_compiled_method(); 2058 lock_nmethod(_nm); 2059 } 2060 2061 // Only JvmtiDeferredEvent::compiled_method_unload_event() 2062 // should pass zombie_ok == true. 2063 void nmethodLocker::lock_nmethod(CompiledMethod* cm, bool zombie_ok) { 2064 if (cm == NULL) return; 2065 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method 2066 nmethod* nm = cm->as_nmethod(); 2067 Atomic::inc(&nm->_lock_count); 2068 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method"); 2069 } 2070 2071 void nmethodLocker::unlock_nmethod(CompiledMethod* cm) { 2072 if (cm == NULL) return; 2073 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method 2074 nmethod* nm = cm->as_nmethod(); 2075 Atomic::dec(&nm->_lock_count); 2076 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock"); 2077 } 2078 2079 2080 // ----------------------------------------------------------------------------- 2081 // Verification 2082 2083 class VerifyOopsClosure: public OopClosure { 2084 nmethod* _nm; 2085 bool _ok; 2086 public: 2087 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { } 2088 bool ok() { return _ok; } 2089 virtual void do_oop(oop* p) { 2090 if (oopDesc::is_oop_or_null(*p)) return; 2091 if (_ok) { 2092 _nm->print_nmethod(true); 2093 _ok = false; 2094 } 2095 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)", 2096 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm)); 2097 } 2098 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2099 }; 2100 2101 void nmethod::verify() { 2102 2103 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant 2104 // seems odd. 2105 2106 if (is_zombie() || is_not_entrant() || is_unloaded()) 2107 return; 2108 2109 // Make sure all the entry points are correctly aligned for patching. 2110 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point()); 2111 2112 // assert(oopDesc::is_oop(method()), "must be valid"); 2113 2114 ResourceMark rm; 2115 2116 if (!CodeCache::contains(this)) { 2117 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this)); 2118 } 2119 2120 if(is_native_method() ) 2121 return; 2122 2123 nmethod* nm = CodeCache::find_nmethod(verified_entry_point()); 2124 if (nm != this) { 2125 fatal("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this)); 2126 } 2127 2128 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2129 if (! p->verify(this)) { 2130 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this)); 2131 } 2132 } 2133 2134 VerifyOopsClosure voc(this); 2135 oops_do(&voc); 2136 assert(voc.ok(), "embedded oops must be OK"); 2137 verify_scavenge_root_oops(); 2138 2139 verify_scopes(); 2140 } 2141 2142 2143 void nmethod::verify_interrupt_point(address call_site) { 2144 // Verify IC only when nmethod installation is finished. 2145 bool is_installed = (method()->code() == this) // nmethod is in state 'in_use' and installed 2146 || !this->is_in_use(); // nmethod is installed, but not in 'in_use' state 2147 if (is_installed) { 2148 Thread *cur = Thread::current(); 2149 if (CompiledIC_lock->owner() == cur || 2150 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) && 2151 SafepointSynchronize::is_at_safepoint())) { 2152 CompiledIC_at(this, call_site); 2153 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); 2154 } else { 2155 MutexLocker ml_verify (CompiledIC_lock); 2156 CompiledIC_at(this, call_site); 2157 } 2158 } 2159 2160 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address()); 2161 assert(pd != NULL, "PcDesc must exist"); 2162 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(), 2163 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(), 2164 pd->return_oop()); 2165 !sd->is_top(); sd = sd->sender()) { 2166 sd->verify(); 2167 } 2168 } 2169 2170 void nmethod::verify_scopes() { 2171 if( !method() ) return; // Runtime stubs have no scope 2172 if (method()->is_native()) return; // Ignore stub methods. 2173 // iterate through all interrupt point 2174 // and verify the debug information is valid. 2175 RelocIterator iter((nmethod*)this); 2176 while (iter.next()) { 2177 address stub = NULL; 2178 switch (iter.type()) { 2179 case relocInfo::virtual_call_type: 2180 verify_interrupt_point(iter.addr()); 2181 break; 2182 case relocInfo::opt_virtual_call_type: 2183 stub = iter.opt_virtual_call_reloc()->static_stub(false); 2184 verify_interrupt_point(iter.addr()); 2185 break; 2186 case relocInfo::static_call_type: 2187 stub = iter.static_call_reloc()->static_stub(false); 2188 //verify_interrupt_point(iter.addr()); 2189 break; 2190 case relocInfo::runtime_call_type: 2191 case relocInfo::runtime_call_w_cp_type: { 2192 address destination = iter.reloc()->value(); 2193 // Right now there is no way to find out which entries support 2194 // an interrupt point. It would be nice if we had this 2195 // information in a table. 2196 break; 2197 } 2198 default: 2199 break; 2200 } 2201 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section"); 2202 } 2203 } 2204 2205 2206 // ----------------------------------------------------------------------------- 2207 // Non-product code 2208 #ifndef PRODUCT 2209 2210 class DebugScavengeRoot: public OopClosure { 2211 nmethod* _nm; 2212 bool _ok; 2213 public: 2214 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { } 2215 bool ok() { return _ok; } 2216 virtual void do_oop(oop* p) { 2217 if ((*p) == NULL || !(*p)->is_scavengable()) return; 2218 if (_ok) { 2219 _nm->print_nmethod(true); 2220 _ok = false; 2221 } 2222 tty->print_cr("*** scavengable oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)", 2223 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm)); 2224 (*p)->print(); 2225 } 2226 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2227 }; 2228 2229 void nmethod::verify_scavenge_root_oops() { 2230 if (UseG1GC) { 2231 return; 2232 } 2233 2234 if (!on_scavenge_root_list()) { 2235 // Actually look inside, to verify the claim that it's clean. 2236 DebugScavengeRoot debug_scavenge_root(this); 2237 oops_do(&debug_scavenge_root); 2238 if (!debug_scavenge_root.ok()) 2239 fatal("found an unadvertised bad scavengable oop in the code cache"); 2240 } 2241 assert(scavenge_root_not_marked(), ""); 2242 } 2243 2244 #endif // PRODUCT 2245 2246 // Printing operations 2247 2248 void nmethod::print() const { 2249 ResourceMark rm; 2250 ttyLocker ttyl; // keep the following output all in one block 2251 2252 tty->print("Compiled method "); 2253 2254 if (is_compiled_by_c1()) { 2255 tty->print("(c1) "); 2256 } else if (is_compiled_by_c2()) { 2257 tty->print("(c2) "); 2258 } else if (is_compiled_by_shark()) { 2259 tty->print("(shark) "); 2260 } else if (is_compiled_by_jvmci()) { 2261 tty->print("(JVMCI) "); 2262 } else { 2263 tty->print("(nm) "); 2264 } 2265 2266 print_on(tty, NULL); 2267 2268 if (WizardMode) { 2269 tty->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this)); 2270 tty->print(" for method " INTPTR_FORMAT , p2i(method())); 2271 tty->print(" { "); 2272 tty->print_cr("%s ", state()); 2273 if (on_scavenge_root_list()) tty->print("scavenge_root "); 2274 tty->print_cr("}:"); 2275 } 2276 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2277 p2i(this), 2278 p2i(this) + size(), 2279 size()); 2280 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2281 p2i(relocation_begin()), 2282 p2i(relocation_end()), 2283 relocation_size()); 2284 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2285 p2i(consts_begin()), 2286 p2i(consts_end()), 2287 consts_size()); 2288 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2289 p2i(insts_begin()), 2290 p2i(insts_end()), 2291 insts_size()); 2292 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2293 p2i(stub_begin()), 2294 p2i(stub_end()), 2295 stub_size()); 2296 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2297 p2i(oops_begin()), 2298 p2i(oops_end()), 2299 oops_size()); 2300 if (metadata_size () > 0) tty->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2301 p2i(metadata_begin()), 2302 p2i(metadata_end()), 2303 metadata_size()); 2304 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2305 p2i(scopes_data_begin()), 2306 p2i(scopes_data_end()), 2307 scopes_data_size()); 2308 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2309 p2i(scopes_pcs_begin()), 2310 p2i(scopes_pcs_end()), 2311 scopes_pcs_size()); 2312 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2313 p2i(dependencies_begin()), 2314 p2i(dependencies_end()), 2315 dependencies_size()); 2316 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2317 p2i(handler_table_begin()), 2318 p2i(handler_table_end()), 2319 handler_table_size()); 2320 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2321 p2i(nul_chk_table_begin()), 2322 p2i(nul_chk_table_end()), 2323 nul_chk_table_size()); 2324 } 2325 2326 #ifndef PRODUCT 2327 2328 void nmethod::print_scopes() { 2329 // Find the first pc desc for all scopes in the code and print it. 2330 ResourceMark rm; 2331 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2332 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null) 2333 continue; 2334 2335 ScopeDesc* sd = scope_desc_at(p->real_pc(this)); 2336 while (sd != NULL) { 2337 sd->print_on(tty, p); 2338 sd = sd->sender(); 2339 } 2340 } 2341 } 2342 2343 void nmethod::print_dependencies() { 2344 ResourceMark rm; 2345 ttyLocker ttyl; // keep the following output all in one block 2346 tty->print_cr("Dependencies:"); 2347 for (Dependencies::DepStream deps(this); deps.next(); ) { 2348 deps.print_dependency(); 2349 Klass* ctxk = deps.context_type(); 2350 if (ctxk != NULL) { 2351 if (ctxk->is_instance_klass() && InstanceKlass::cast(ctxk)->is_dependent_nmethod(this)) { 2352 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name()); 2353 } 2354 } 2355 deps.log_dependency(); // put it into the xml log also 2356 } 2357 } 2358 2359 2360 void nmethod::print_relocations() { 2361 ResourceMark m; // in case methods get printed via the debugger 2362 tty->print_cr("relocations:"); 2363 RelocIterator iter(this); 2364 iter.print(); 2365 } 2366 2367 2368 void nmethod::print_pcs() { 2369 ResourceMark m; // in case methods get printed via debugger 2370 tty->print_cr("pc-bytecode offsets:"); 2371 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2372 p->print(this); 2373 } 2374 } 2375 2376 void nmethod::print_recorded_oops() { 2377 tty->print_cr("Recorded oops:"); 2378 for (int i = 0; i < oops_count(); i++) { 2379 oop o = oop_at(i); 2380 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(o)); 2381 if (o == (oop)Universe::non_oop_word()) { 2382 tty->print("non-oop word"); 2383 } else { 2384 o->print_value(); 2385 } 2386 tty->cr(); 2387 } 2388 } 2389 2390 void nmethod::print_recorded_metadata() { 2391 tty->print_cr("Recorded metadata:"); 2392 for (int i = 0; i < metadata_count(); i++) { 2393 Metadata* m = metadata_at(i); 2394 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(m)); 2395 if (m == (Metadata*)Universe::non_oop_word()) { 2396 tty->print("non-metadata word"); 2397 } else { 2398 m->print_value_on_maybe_null(tty); 2399 } 2400 tty->cr(); 2401 } 2402 } 2403 2404 #endif // PRODUCT 2405 2406 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) { 2407 RelocIterator iter(this, begin, end); 2408 bool have_one = false; 2409 while (iter.next()) { 2410 have_one = true; 2411 switch (iter.type()) { 2412 case relocInfo::none: return "no_reloc"; 2413 case relocInfo::oop_type: { 2414 stringStream st; 2415 oop_Relocation* r = iter.oop_reloc(); 2416 oop obj = r->oop_value(); 2417 st.print("oop("); 2418 if (obj == NULL) st.print("NULL"); 2419 else obj->print_value_on(&st); 2420 st.print(")"); 2421 return st.as_string(); 2422 } 2423 case relocInfo::metadata_type: { 2424 stringStream st; 2425 metadata_Relocation* r = iter.metadata_reloc(); 2426 Metadata* obj = r->metadata_value(); 2427 st.print("metadata("); 2428 if (obj == NULL) st.print("NULL"); 2429 else obj->print_value_on(&st); 2430 st.print(")"); 2431 return st.as_string(); 2432 } 2433 case relocInfo::runtime_call_type: 2434 case relocInfo::runtime_call_w_cp_type: { 2435 stringStream st; 2436 st.print("runtime_call"); 2437 CallRelocation* r = (CallRelocation*)iter.reloc(); 2438 address dest = r->destination(); 2439 CodeBlob* cb = CodeCache::find_blob(dest); 2440 if (cb != NULL) { 2441 st.print(" %s", cb->name()); 2442 } else { 2443 ResourceMark rm; 2444 const int buflen = 1024; 2445 char* buf = NEW_RESOURCE_ARRAY(char, buflen); 2446 int offset; 2447 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) { 2448 st.print(" %s", buf); 2449 if (offset != 0) { 2450 st.print("+%d", offset); 2451 } 2452 } 2453 } 2454 return st.as_string(); 2455 } 2456 case relocInfo::virtual_call_type: { 2457 stringStream st; 2458 st.print_raw("virtual_call"); 2459 virtual_call_Relocation* r = iter.virtual_call_reloc(); 2460 Method* m = r->method_value(); 2461 if (m != NULL) { 2462 assert(m->is_method(), ""); 2463 m->print_short_name(&st); 2464 } 2465 return st.as_string(); 2466 } 2467 case relocInfo::opt_virtual_call_type: { 2468 stringStream st; 2469 st.print_raw("optimized virtual_call"); 2470 opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc(); 2471 Method* m = r->method_value(); 2472 if (m != NULL) { 2473 assert(m->is_method(), ""); 2474 m->print_short_name(&st); 2475 } 2476 return st.as_string(); 2477 } 2478 case relocInfo::static_call_type: { 2479 stringStream st; 2480 st.print_raw("static_call"); 2481 static_call_Relocation* r = iter.static_call_reloc(); 2482 Method* m = r->method_value(); 2483 if (m != NULL) { 2484 assert(m->is_method(), ""); 2485 m->print_short_name(&st); 2486 } 2487 return st.as_string(); 2488 } 2489 case relocInfo::static_stub_type: return "static_stub"; 2490 case relocInfo::external_word_type: return "external_word"; 2491 case relocInfo::internal_word_type: return "internal_word"; 2492 case relocInfo::section_word_type: return "section_word"; 2493 case relocInfo::poll_type: return "poll"; 2494 case relocInfo::poll_return_type: return "poll_return"; 2495 case relocInfo::type_mask: return "type_bit_mask"; 2496 2497 default: 2498 break; 2499 } 2500 } 2501 return have_one ? "other" : NULL; 2502 } 2503 2504 // Return a the last scope in (begin..end] 2505 ScopeDesc* nmethod::scope_desc_in(address begin, address end) { 2506 PcDesc* p = pc_desc_near(begin+1); 2507 if (p != NULL && p->real_pc(this) <= end) { 2508 return new ScopeDesc(this, p->scope_decode_offset(), 2509 p->obj_decode_offset(), p->should_reexecute(), p->rethrow_exception(), 2510 p->return_oop()); 2511 } 2512 return NULL; 2513 } 2514 2515 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const { 2516 if (block_begin == entry_point()) stream->print_cr("[Entry Point]"); 2517 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]"); 2518 if (JVMCI_ONLY(_exception_offset >= 0 &&) block_begin == exception_begin()) stream->print_cr("[Exception Handler]"); 2519 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]"); 2520 if (JVMCI_ONLY(_deopt_handler_begin != NULL &&) block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]"); 2521 2522 if (has_method_handle_invokes()) 2523 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]"); 2524 2525 if (block_begin == consts_begin()) stream->print_cr("[Constants]"); 2526 2527 if (block_begin == entry_point()) { 2528 methodHandle m = method(); 2529 if (m.not_null()) { 2530 stream->print(" # "); 2531 m->print_value_on(stream); 2532 stream->cr(); 2533 } 2534 if (m.not_null() && !is_osr_method()) { 2535 ResourceMark rm; 2536 int sizeargs = m->size_of_parameters(); 2537 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs); 2538 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs); 2539 { 2540 int sig_index = 0; 2541 if (!m->is_static()) 2542 sig_bt[sig_index++] = T_OBJECT; // 'this' 2543 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) { 2544 BasicType t = ss.type(); 2545 sig_bt[sig_index++] = t; 2546 if (type2size[t] == 2) { 2547 sig_bt[sig_index++] = T_VOID; 2548 } else { 2549 assert(type2size[t] == 1, "size is 1 or 2"); 2550 } 2551 } 2552 assert(sig_index == sizeargs, ""); 2553 } 2554 const char* spname = "sp"; // make arch-specific? 2555 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false); 2556 int stack_slot_offset = this->frame_size() * wordSize; 2557 int tab1 = 14, tab2 = 24; 2558 int sig_index = 0; 2559 int arg_index = (m->is_static() ? 0 : -1); 2560 bool did_old_sp = false; 2561 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) { 2562 bool at_this = (arg_index == -1); 2563 bool at_old_sp = false; 2564 BasicType t = (at_this ? T_OBJECT : ss.type()); 2565 assert(t == sig_bt[sig_index], "sigs in sync"); 2566 if (at_this) 2567 stream->print(" # this: "); 2568 else 2569 stream->print(" # parm%d: ", arg_index); 2570 stream->move_to(tab1); 2571 VMReg fst = regs[sig_index].first(); 2572 VMReg snd = regs[sig_index].second(); 2573 if (fst->is_reg()) { 2574 stream->print("%s", fst->name()); 2575 if (snd->is_valid()) { 2576 stream->print(":%s", snd->name()); 2577 } 2578 } else if (fst->is_stack()) { 2579 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset; 2580 if (offset == stack_slot_offset) at_old_sp = true; 2581 stream->print("[%s+0x%x]", spname, offset); 2582 } else { 2583 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd); 2584 } 2585 stream->print(" "); 2586 stream->move_to(tab2); 2587 stream->print("= "); 2588 if (at_this) { 2589 m->method_holder()->print_value_on(stream); 2590 } else { 2591 bool did_name = false; 2592 if (!at_this && ss.is_object()) { 2593 Symbol* name = ss.as_symbol_or_null(); 2594 if (name != NULL) { 2595 name->print_value_on(stream); 2596 did_name = true; 2597 } 2598 } 2599 if (!did_name) 2600 stream->print("%s", type2name(t)); 2601 } 2602 if (at_old_sp) { 2603 stream->print(" (%s of caller)", spname); 2604 did_old_sp = true; 2605 } 2606 stream->cr(); 2607 sig_index += type2size[t]; 2608 arg_index += 1; 2609 if (!at_this) ss.next(); 2610 } 2611 if (!did_old_sp) { 2612 stream->print(" # "); 2613 stream->move_to(tab1); 2614 stream->print("[%s+0x%x]", spname, stack_slot_offset); 2615 stream->print(" (%s of caller)", spname); 2616 stream->cr(); 2617 } 2618 } 2619 } 2620 } 2621 2622 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) { 2623 // First, find an oopmap in (begin, end]. 2624 // We use the odd half-closed interval so that oop maps and scope descs 2625 // which are tied to the byte after a call are printed with the call itself. 2626 address base = code_begin(); 2627 ImmutableOopMapSet* oms = oop_maps(); 2628 if (oms != NULL) { 2629 for (int i = 0, imax = oms->count(); i < imax; i++) { 2630 const ImmutableOopMapPair* pair = oms->pair_at(i); 2631 const ImmutableOopMap* om = pair->get_from(oms); 2632 address pc = base + pair->pc_offset(); 2633 if (pc > begin) { 2634 if (pc <= end) { 2635 st->move_to(column); 2636 st->print("; "); 2637 om->print_on(st); 2638 } 2639 break; 2640 } 2641 } 2642 } 2643 2644 // Print any debug info present at this pc. 2645 ScopeDesc* sd = scope_desc_in(begin, end); 2646 if (sd != NULL) { 2647 st->move_to(column); 2648 if (sd->bci() == SynchronizationEntryBCI) { 2649 st->print(";*synchronization entry"); 2650 } else { 2651 if (sd->method() == NULL) { 2652 st->print("method is NULL"); 2653 } else if (sd->method()->is_native()) { 2654 st->print("method is native"); 2655 } else { 2656 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci()); 2657 st->print(";*%s", Bytecodes::name(bc)); 2658 switch (bc) { 2659 case Bytecodes::_invokevirtual: 2660 case Bytecodes::_invokespecial: 2661 case Bytecodes::_invokestatic: 2662 case Bytecodes::_invokeinterface: 2663 { 2664 Bytecode_invoke invoke(sd->method(), sd->bci()); 2665 st->print(" "); 2666 if (invoke.name() != NULL) 2667 invoke.name()->print_symbol_on(st); 2668 else 2669 st->print("<UNKNOWN>"); 2670 break; 2671 } 2672 case Bytecodes::_getfield: 2673 case Bytecodes::_putfield: 2674 case Bytecodes::_getstatic: 2675 case Bytecodes::_putstatic: 2676 { 2677 Bytecode_field field(sd->method(), sd->bci()); 2678 st->print(" "); 2679 if (field.name() != NULL) 2680 field.name()->print_symbol_on(st); 2681 else 2682 st->print("<UNKNOWN>"); 2683 } 2684 default: 2685 break; 2686 } 2687 } 2688 st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop()); 2689 } 2690 2691 // Print all scopes 2692 for (;sd != NULL; sd = sd->sender()) { 2693 st->move_to(column); 2694 st->print("; -"); 2695 if (sd->method() == NULL) { 2696 st->print("method is NULL"); 2697 } else { 2698 sd->method()->print_short_name(st); 2699 } 2700 int lineno = sd->method()->line_number_from_bci(sd->bci()); 2701 if (lineno != -1) { 2702 st->print("@%d (line %d)", sd->bci(), lineno); 2703 } else { 2704 st->print("@%d", sd->bci()); 2705 } 2706 st->cr(); 2707 } 2708 } 2709 2710 // Print relocation information 2711 const char* str = reloc_string_for(begin, end); 2712 if (str != NULL) { 2713 if (sd != NULL) st->cr(); 2714 st->move_to(column); 2715 st->print("; {%s}", str); 2716 } 2717 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin()); 2718 if (cont_offset != 0) { 2719 st->move_to(column); 2720 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset)); 2721 } 2722 2723 } 2724 2725 class DirectNativeCallWrapper: public NativeCallWrapper { 2726 private: 2727 NativeCall* _call; 2728 2729 public: 2730 DirectNativeCallWrapper(NativeCall* call) : _call(call) {} 2731 2732 virtual address destination() const { return _call->destination(); } 2733 virtual address instruction_address() const { return _call->instruction_address(); } 2734 virtual address next_instruction_address() const { return _call->next_instruction_address(); } 2735 virtual address return_address() const { return _call->return_address(); } 2736 2737 virtual address get_resolve_call_stub(bool is_optimized) const { 2738 if (is_optimized) { 2739 return SharedRuntime::get_resolve_opt_virtual_call_stub(); 2740 } 2741 return SharedRuntime::get_resolve_virtual_call_stub(); 2742 } 2743 2744 virtual void set_destination_mt_safe(address dest) { 2745 #if INCLUDE_AOT 2746 if (UseAOT) { 2747 CodeBlob* callee = CodeCache::find_blob(dest); 2748 CompiledMethod* cm = callee->as_compiled_method_or_null(); 2749 if (cm != NULL && cm->is_far_code()) { 2750 // Temporary fix, see JDK-8143106 2751 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address()); 2752 csc->set_to_far(methodHandle(cm->method()), dest); 2753 return; 2754 } 2755 } 2756 #endif 2757 _call->set_destination_mt_safe(dest); 2758 } 2759 2760 virtual void set_to_interpreted(const methodHandle& method, CompiledICInfo& info) { 2761 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address()); 2762 #if INCLUDE_AOT 2763 if (info.to_aot()) { 2764 csc->set_to_far(method, info.entry()); 2765 } else 2766 #endif 2767 { 2768 csc->set_to_interpreted(method, info.entry()); 2769 } 2770 } 2771 2772 virtual void verify() const { 2773 // make sure code pattern is actually a call imm32 instruction 2774 _call->verify(); 2775 if (os::is_MP()) { 2776 _call->verify_alignment(); 2777 } 2778 } 2779 2780 virtual void verify_resolve_call(address dest) const { 2781 CodeBlob* db = CodeCache::find_blob_unsafe(dest); 2782 assert(!db->is_adapter_blob(), "must use stub!"); 2783 } 2784 2785 virtual bool is_call_to_interpreted(address dest) const { 2786 CodeBlob* cb = CodeCache::find_blob(_call->instruction_address()); 2787 return cb->contains(dest); 2788 } 2789 2790 virtual bool is_safe_for_patching() const { return false; } 2791 2792 virtual NativeInstruction* get_load_instruction(virtual_call_Relocation* r) const { 2793 return nativeMovConstReg_at(r->cached_value()); 2794 } 2795 2796 virtual void *get_data(NativeInstruction* instruction) const { 2797 return (void*)((NativeMovConstReg*) instruction)->data(); 2798 } 2799 2800 virtual void set_data(NativeInstruction* instruction, intptr_t data) { 2801 ((NativeMovConstReg*) instruction)->set_data(data); 2802 } 2803 }; 2804 2805 NativeCallWrapper* nmethod::call_wrapper_at(address call) const { 2806 return new DirectNativeCallWrapper((NativeCall*) call); 2807 } 2808 2809 NativeCallWrapper* nmethod::call_wrapper_before(address return_pc) const { 2810 return new DirectNativeCallWrapper(nativeCall_before(return_pc)); 2811 } 2812 2813 address nmethod::call_instruction_address(address pc) const { 2814 if (NativeCall::is_call_before(pc)) { 2815 NativeCall *ncall = nativeCall_before(pc); 2816 return ncall->instruction_address(); 2817 } 2818 return NULL; 2819 } 2820 2821 CompiledStaticCall* nmethod::compiledStaticCall_at(Relocation* call_site) const { 2822 return CompiledDirectStaticCall::at(call_site); 2823 } 2824 2825 CompiledStaticCall* nmethod::compiledStaticCall_at(address call_site) const { 2826 return CompiledDirectStaticCall::at(call_site); 2827 } 2828 2829 CompiledStaticCall* nmethod::compiledStaticCall_before(address return_addr) const { 2830 return CompiledDirectStaticCall::before(return_addr); 2831 } 2832 2833 #ifndef PRODUCT 2834 2835 void nmethod::print_value_on(outputStream* st) const { 2836 st->print("nmethod"); 2837 print_on(st, NULL); 2838 } 2839 2840 void nmethod::print_calls(outputStream* st) { 2841 RelocIterator iter(this); 2842 while (iter.next()) { 2843 switch (iter.type()) { 2844 case relocInfo::virtual_call_type: 2845 case relocInfo::opt_virtual_call_type: { 2846 VerifyMutexLocker mc(CompiledIC_lock); 2847 CompiledIC_at(&iter)->print(); 2848 break; 2849 } 2850 case relocInfo::static_call_type: 2851 st->print_cr("Static call at " INTPTR_FORMAT, p2i(iter.reloc()->addr())); 2852 CompiledDirectStaticCall::at(iter.reloc())->print(); 2853 break; 2854 default: 2855 break; 2856 } 2857 } 2858 } 2859 2860 void nmethod::print_handler_table() { 2861 ExceptionHandlerTable(this).print(); 2862 } 2863 2864 void nmethod::print_nul_chk_table() { 2865 ImplicitExceptionTable(this).print(code_begin()); 2866 } 2867 2868 void nmethod::print_statistics() { 2869 ttyLocker ttyl; 2870 if (xtty != NULL) xtty->head("statistics type='nmethod'"); 2871 native_nmethod_stats.print_native_nmethod_stats(); 2872 #ifdef COMPILER1 2873 c1_java_nmethod_stats.print_nmethod_stats("C1"); 2874 #endif 2875 #ifdef COMPILER2 2876 c2_java_nmethod_stats.print_nmethod_stats("C2"); 2877 #endif 2878 #if INCLUDE_JVMCI 2879 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI"); 2880 #endif 2881 #ifdef SHARK 2882 shark_java_nmethod_stats.print_nmethod_stats("Shark"); 2883 #endif 2884 unknown_java_nmethod_stats.print_nmethod_stats("Unknown"); 2885 DebugInformationRecorder::print_statistics(); 2886 #ifndef PRODUCT 2887 pc_nmethod_stats.print_pc_stats(); 2888 #endif 2889 Dependencies::print_statistics(); 2890 if (xtty != NULL) xtty->tail("statistics"); 2891 } 2892 2893 #endif // !PRODUCT 2894 2895 #if INCLUDE_JVMCI 2896 void nmethod::clear_jvmci_installed_code() { 2897 // write_ref_method_pre/post can only be safely called at a 2898 // safepoint or while holding the CodeCache_lock 2899 assert(CodeCache_lock->is_locked() || 2900 SafepointSynchronize::is_at_safepoint(), "should be performed under a lock for consistency"); 2901 if (_jvmci_installed_code != NULL) { 2902 // This must be done carefully to maintain nmethod remembered sets properly 2903 BarrierSet* bs = Universe::heap()->barrier_set(); 2904 bs->write_ref_nmethod_pre(&_jvmci_installed_code, this); 2905 _jvmci_installed_code = NULL; 2906 bs->write_ref_nmethod_post(&_jvmci_installed_code, this); 2907 } 2908 } 2909 2910 void nmethod::maybe_invalidate_installed_code() { 2911 assert(Patching_lock->is_locked() || 2912 SafepointSynchronize::is_at_safepoint(), "should be performed under a lock for consistency"); 2913 oop installed_code = jvmci_installed_code(); 2914 if (installed_code != NULL) { 2915 nmethod* nm = (nmethod*)InstalledCode::address(installed_code); 2916 if (nm == NULL || nm != this) { 2917 // The link has been broken or the InstalledCode instance is 2918 // associated with another nmethod so do nothing. 2919 return; 2920 } 2921 if (!is_alive()) { 2922 // Break the link between nmethod and InstalledCode such that the nmethod 2923 // can subsequently be flushed safely. The link must be maintained while 2924 // the method could have live activations since invalidateInstalledCode 2925 // might want to invalidate all existing activations. 2926 InstalledCode::set_address(installed_code, 0); 2927 InstalledCode::set_entryPoint(installed_code, 0); 2928 } else if (is_not_entrant()) { 2929 // Remove the entry point so any invocation will fail but keep 2930 // the address link around that so that existing activations can 2931 // be invalidated. 2932 InstalledCode::set_entryPoint(installed_code, 0); 2933 } 2934 } 2935 } 2936 2937 void nmethod::invalidate_installed_code(Handle installedCode, TRAPS) { 2938 if (installedCode() == NULL) { 2939 THROW(vmSymbols::java_lang_NullPointerException()); 2940 } 2941 jlong nativeMethod = InstalledCode::address(installedCode); 2942 nmethod* nm = (nmethod*)nativeMethod; 2943 if (nm == NULL) { 2944 // Nothing to do 2945 return; 2946 } 2947 2948 nmethodLocker nml(nm); 2949 #ifdef ASSERT 2950 { 2951 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 2952 // This relationship can only be checked safely under a lock 2953 assert(nm == NULL || !nm->is_alive() || nm->jvmci_installed_code() == installedCode(), "sanity check"); 2954 } 2955 #endif 2956 2957 if (nm->is_alive()) { 2958 // The nmethod state machinery maintains the link between the 2959 // HotSpotInstalledCode and nmethod* so as long as the nmethod appears to be 2960 // alive assume there is work to do and deoptimize the nmethod. 2961 nm->mark_for_deoptimization(); 2962 VM_Deoptimize op; 2963 VMThread::execute(&op); 2964 } 2965 2966 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 2967 // Check that it's still associated with the same nmethod and break 2968 // the link if it is. 2969 if (InstalledCode::address(installedCode) == nativeMethod) { 2970 InstalledCode::set_address(installedCode, 0); 2971 } 2972 } 2973 2974 char* nmethod::jvmci_installed_code_name(char* buf, size_t buflen) { 2975 if (!this->is_compiled_by_jvmci()) { 2976 return NULL; 2977 } 2978 oop installedCode = this->jvmci_installed_code(); 2979 if (installedCode != NULL) { 2980 oop installedCodeName = NULL; 2981 if (installedCode->is_a(InstalledCode::klass())) { 2982 installedCodeName = InstalledCode::name(installedCode); 2983 } 2984 if (installedCodeName != NULL) { 2985 return java_lang_String::as_utf8_string(installedCodeName, buf, (int)buflen); 2986 } else { 2987 jio_snprintf(buf, buflen, "null"); 2988 return buf; 2989 } 2990 } 2991 jio_snprintf(buf, buflen, "noInstalledCode"); 2992 return buf; 2993 } 2994 #endif