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