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 } 991 } 992 } 993 994 // This is a private interface with the sweeper. 995 void nmethod::mark_as_seen_on_stack() { 996 assert(is_alive(), "Must be an alive method"); 997 // Set the traversal mark to ensure that the sweeper does 2 998 // cleaning passes before moving to zombie. 999 set_stack_traversal_mark(NMethodSweeper::traversal_count()); 1000 } 1001 1002 // Tell if a non-entrant method can be converted to a zombie (i.e., 1003 // there are no activations on the stack, not in use by the VM, 1004 // and not in use by the ServiceThread) 1005 bool nmethod::can_convert_to_zombie() { 1006 assert(is_not_entrant(), "must be a non-entrant method"); 1007 1008 // Since the nmethod sweeper only does partial sweep the sweeper's traversal 1009 // count can be greater than the stack traversal count before it hits the 1010 // nmethod for the second time. 1011 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count() && 1012 !is_locked_by_vm(); 1013 } 1014 1015 void nmethod::inc_decompile_count() { 1016 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return; 1017 // Could be gated by ProfileTraps, but do not bother... 1018 Method* m = method(); 1019 if (m == NULL) return; 1020 MethodData* mdo = m->method_data(); 1021 if (mdo == NULL) return; 1022 // There is a benign race here. See comments in methodData.hpp. 1023 mdo->inc_decompile_count(); 1024 } 1025 1026 void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) { 1027 1028 post_compiled_method_unload(); 1029 1030 // Since this nmethod is being unloaded, make sure that dependencies 1031 // recorded in instanceKlasses get flushed and pass non-NULL closure to 1032 // indicate that this work is being done during a GC. 1033 assert(Universe::heap()->is_gc_active(), "should only be called during gc"); 1034 assert(is_alive != NULL, "Should be non-NULL"); 1035 // A non-NULL is_alive closure indicates that this is being called during GC. 1036 flush_dependencies(is_alive); 1037 1038 // Break cycle between nmethod & method 1039 if (log_is_enabled(Trace, class, unload)) { 1040 outputStream* log = Log(class, unload)::trace_stream(); 1041 log->print_cr("making nmethod " INTPTR_FORMAT 1042 " unloadable, Method*(" INTPTR_FORMAT 1043 "), cause(" INTPTR_FORMAT ")", 1044 p2i(this), p2i(_method), p2i(cause)); 1045 if (!Universe::heap()->is_gc_active()) 1046 cause->klass()->print_on(log); 1047 } 1048 // Unlink the osr method, so we do not look this up again 1049 if (is_osr_method()) { 1050 // Invalidate the osr nmethod only once 1051 if (is_in_use()) { 1052 invalidate_osr_method(); 1053 } 1054 #ifdef ASSERT 1055 if (method() != NULL) { 1056 // Make sure osr nmethod is invalidated, i.e. not on the list 1057 bool found = method()->method_holder()->remove_osr_nmethod(this); 1058 assert(!found, "osr nmethod should have been invalidated"); 1059 } 1060 #endif 1061 } 1062 1063 // If _method is already NULL the Method* is about to be unloaded, 1064 // so we don't have to break the cycle. Note that it is possible to 1065 // have the Method* live here, in case we unload the nmethod because 1066 // it is pointing to some oop (other than the Method*) being unloaded. 1067 if (_method != NULL) { 1068 // OSR methods point to the Method*, but the Method* does not 1069 // point back! 1070 if (_method->code() == this) { 1071 _method->clear_code(); // Break a cycle 1072 } 1073 _method = NULL; // Clear the method of this dead nmethod 1074 } 1075 1076 // Make the class unloaded - i.e., change state and notify sweeper 1077 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); 1078 if (is_in_use()) { 1079 // Transitioning directly from live to unloaded -- so 1080 // we need to force a cache clean-up; remember this 1081 // for later on. 1082 CodeCache::set_needs_cache_clean(true); 1083 } 1084 1085 // Unregister must be done before the state change 1086 Universe::heap()->unregister_nmethod(this); 1087 1088 _state = unloaded; 1089 1090 // Log the unloading. 1091 log_state_change(); 1092 1093 #if INCLUDE_JVMCI 1094 // The method can only be unloaded after the pointer to the installed code 1095 // Java wrapper is no longer alive. Here we need to clear out this weak 1096 // reference to the dead object. Nulling out the reference has to happen 1097 // after the method is unregistered since the original value may be still 1098 // tracked by the rset. 1099 maybe_invalidate_installed_code(); 1100 // Clear these out after the nmethod has been unregistered and any 1101 // updates to the InstalledCode instance have been performed. 1102 _jvmci_installed_code = NULL; 1103 _speculation_log = NULL; 1104 #endif 1105 1106 // The Method* is gone at this point 1107 assert(_method == NULL, "Tautology"); 1108 1109 set_osr_link(NULL); 1110 NMethodSweeper::report_state_change(this); 1111 } 1112 1113 void nmethod::invalidate_osr_method() { 1114 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); 1115 // Remove from list of active nmethods 1116 if (method() != NULL) { 1117 method()->method_holder()->remove_osr_nmethod(this); 1118 } 1119 } 1120 1121 void nmethod::log_state_change() const { 1122 if (LogCompilation) { 1123 if (xtty != NULL) { 1124 ttyLocker ttyl; // keep the following output all in one block 1125 if (_state == unloaded) { 1126 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'", 1127 os::current_thread_id()); 1128 } else { 1129 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s", 1130 os::current_thread_id(), 1131 (_state == zombie ? " zombie='1'" : "")); 1132 } 1133 log_identity(xtty); 1134 xtty->stamp(); 1135 xtty->end_elem(); 1136 } 1137 } 1138 1139 const char *state_msg = _state == zombie ? "made zombie" : "made not entrant"; 1140 CompileTask::print_ul(this, state_msg); 1141 if (PrintCompilation && _state != unloaded) { 1142 print_on(tty, state_msg); 1143 } 1144 } 1145 1146 /** 1147 * Common functionality for both make_not_entrant and make_zombie 1148 */ 1149 bool nmethod::make_not_entrant_or_zombie(unsigned int state) { 1150 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant"); 1151 assert(!is_zombie(), "should not already be a zombie"); 1152 1153 if (_state == state) { 1154 // Avoid taking the lock if already in required state. 1155 // This is safe from races because the state is an end-state, 1156 // which the nmethod cannot back out of once entered. 1157 // No need for fencing either. 1158 return false; 1159 } 1160 1161 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below. 1162 nmethodLocker nml(this); 1163 methodHandle the_method(method()); 1164 NoSafepointVerifier nsv; 1165 1166 // during patching, depending on the nmethod state we must notify the GC that 1167 // code has been unloaded, unregistering it. We cannot do this right while 1168 // holding the Patching_lock because we need to use the CodeCache_lock. This 1169 // would be prone to deadlocks. 1170 // This flag is used to remember whether we need to later lock and unregister. 1171 bool nmethod_needs_unregister = false; 1172 1173 { 1174 // invalidate osr nmethod before acquiring the patching lock since 1175 // they both acquire leaf locks and we don't want a deadlock. 1176 // This logic is equivalent to the logic below for patching the 1177 // verified entry point of regular methods. We check that the 1178 // nmethod is in use to ensure that it is invalidated only once. 1179 if (is_osr_method() && is_in_use()) { 1180 // this effectively makes the osr nmethod not entrant 1181 invalidate_osr_method(); 1182 } 1183 1184 // Enter critical section. Does not block for safepoint. 1185 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 1186 1187 if (_state == state) { 1188 // another thread already performed this transition so nothing 1189 // to do, but return false to indicate this. 1190 return false; 1191 } 1192 1193 // The caller can be calling the method statically or through an inline 1194 // cache call. 1195 if (!is_osr_method() && !is_not_entrant()) { 1196 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(), 1197 SharedRuntime::get_handle_wrong_method_stub()); 1198 } 1199 1200 if (is_in_use() && update_recompile_counts()) { 1201 // It's a true state change, so mark the method as decompiled. 1202 // Do it only for transition from alive. 1203 inc_decompile_count(); 1204 } 1205 1206 // If the state is becoming a zombie, signal to unregister the nmethod with 1207 // the heap. 1208 // This nmethod may have already been unloaded during a full GC. 1209 if ((state == zombie) && !is_unloaded()) { 1210 nmethod_needs_unregister = true; 1211 } 1212 1213 // Must happen before state change. Otherwise we have a race condition in 1214 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately 1215 // transition its state from 'not_entrant' to 'zombie' without having to wait 1216 // for stack scanning. 1217 if (state == not_entrant) { 1218 mark_as_seen_on_stack(); 1219 OrderAccess::storestore(); 1220 } 1221 1222 // Change state 1223 _state = state; 1224 1225 // Log the transition once 1226 log_state_change(); 1227 1228 // Invalidate while holding the patching lock 1229 JVMCI_ONLY(maybe_invalidate_installed_code()); 1230 1231 // Remove nmethod from method. 1232 // We need to check if both the _code and _from_compiled_code_entry_point 1233 // refer to this nmethod because there is a race in setting these two fields 1234 // in Method* as seen in bugid 4947125. 1235 // If the vep() points to the zombie nmethod, the memory for the nmethod 1236 // could be flushed and the compiler and vtable stubs could still call 1237 // through it. 1238 if (method() != NULL && (method()->code() == this || 1239 method()->from_compiled_entry() == verified_entry_point())) { 1240 HandleMark hm; 1241 method()->clear_code(false /* already owns Patching_lock */); 1242 } 1243 } // leave critical region under Patching_lock 1244 1245 #ifdef ASSERT 1246 if (is_osr_method() && method() != NULL) { 1247 // Make sure osr nmethod is invalidated, i.e. not on the list 1248 bool found = method()->method_holder()->remove_osr_nmethod(this); 1249 assert(!found, "osr nmethod should have been invalidated"); 1250 } 1251 #endif 1252 1253 // When the nmethod becomes zombie it is no longer alive so the 1254 // dependencies must be flushed. nmethods in the not_entrant 1255 // state will be flushed later when the transition to zombie 1256 // happens or they get unloaded. 1257 if (state == zombie) { 1258 { 1259 // Flushing dependencies must be done before any possible 1260 // safepoint can sneak in, otherwise the oops used by the 1261 // dependency logic could have become stale. 1262 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1263 if (nmethod_needs_unregister) { 1264 Universe::heap()->unregister_nmethod(this); 1265 #ifdef JVMCI 1266 _jvmci_installed_code = NULL; 1267 _speculation_log = NULL; 1268 #endif 1269 } 1270 flush_dependencies(NULL); 1271 } 1272 1273 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload 1274 // event and it hasn't already been reported for this nmethod then 1275 // report it now. The event may have been reported earlier if the GC 1276 // marked it for unloading). JvmtiDeferredEventQueue support means 1277 // we no longer go to a safepoint here. 1278 post_compiled_method_unload(); 1279 1280 #ifdef ASSERT 1281 // It's no longer safe to access the oops section since zombie 1282 // nmethods aren't scanned for GC. 1283 _oops_are_stale = true; 1284 #endif 1285 // the Method may be reclaimed by class unloading now that the 1286 // nmethod is in zombie state 1287 set_method(NULL); 1288 } else { 1289 assert(state == not_entrant, "other cases may need to be handled differently"); 1290 } 1291 1292 if (TraceCreateZombies) { 1293 ResourceMark m; 1294 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"); 1295 } 1296 1297 NMethodSweeper::report_state_change(this); 1298 return true; 1299 } 1300 1301 void nmethod::flush() { 1302 // Note that there are no valid oops in the nmethod anymore. 1303 assert(!is_osr_method() || is_unloaded() || is_zombie(), 1304 "osr nmethod must be unloaded or zombie before flushing"); 1305 assert(is_zombie() || is_osr_method(), "must be a zombie method"); 1306 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed"); 1307 assert_locked_or_safepoint(CodeCache_lock); 1308 1309 // completely deallocate this method 1310 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, p2i(this)); 1311 if (PrintMethodFlushing) { 1312 tty->print_cr("*flushing %s nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT 1313 "/Free CodeCache:" SIZE_FORMAT "Kb", 1314 is_osr_method() ? "osr" : "",_compile_id, p2i(this), CodeCache::blob_count(), 1315 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024); 1316 } 1317 1318 // We need to deallocate any ExceptionCache data. 1319 // Note that we do not need to grab the nmethod lock for this, it 1320 // better be thread safe if we're disposing of it! 1321 ExceptionCache* ec = exception_cache(); 1322 set_exception_cache(NULL); 1323 while(ec != NULL) { 1324 ExceptionCache* next = ec->next(); 1325 delete ec; 1326 ec = next; 1327 } 1328 1329 if (on_scavenge_root_list()) { 1330 CodeCache::drop_scavenge_root_nmethod(this); 1331 } 1332 1333 #ifdef SHARK 1334 ((SharkCompiler *) compiler())->free_compiled_method(insts_begin()); 1335 #endif // SHARK 1336 1337 CodeBlob::flush(); 1338 CodeCache::free(this); 1339 } 1340 1341 // 1342 // Notify all classes this nmethod is dependent on that it is no 1343 // longer dependent. This should only be called in two situations. 1344 // First, when a nmethod transitions to a zombie all dependents need 1345 // to be clear. Since zombification happens at a safepoint there's no 1346 // synchronization issues. The second place is a little more tricky. 1347 // During phase 1 of mark sweep class unloading may happen and as a 1348 // result some nmethods may get unloaded. In this case the flushing 1349 // of dependencies must happen during phase 1 since after GC any 1350 // dependencies in the unloaded nmethod won't be updated, so 1351 // traversing the dependency information in unsafe. In that case this 1352 // function is called with a non-NULL argument and this function only 1353 // notifies instanceKlasses that are reachable 1354 1355 void nmethod::flush_dependencies(BoolObjectClosure* is_alive) { 1356 assert_locked_or_safepoint(CodeCache_lock); 1357 assert(Universe::heap()->is_gc_active() == (is_alive != NULL), 1358 "is_alive is non-NULL if and only if we are called during GC"); 1359 if (!has_flushed_dependencies()) { 1360 set_has_flushed_dependencies(); 1361 for (Dependencies::DepStream deps(this); deps.next(); ) { 1362 if (deps.type() == Dependencies::call_site_target_value) { 1363 // CallSite dependencies are managed on per-CallSite instance basis. 1364 oop call_site = deps.argument_oop(0); 1365 MethodHandles::remove_dependent_nmethod(call_site, this); 1366 } else { 1367 Klass* klass = deps.context_type(); 1368 if (klass == NULL) { 1369 continue; // ignore things like evol_method 1370 } 1371 // During GC the is_alive closure is non-NULL, and is used to 1372 // determine liveness of dependees that need to be updated. 1373 if (is_alive == NULL || klass->is_loader_alive(is_alive)) { 1374 // The GC defers deletion of this entry, since there might be multiple threads 1375 // iterating over the _dependencies graph. Other call paths are single-threaded 1376 // and may delete it immediately. 1377 bool delete_immediately = is_alive == NULL; 1378 InstanceKlass::cast(klass)->remove_dependent_nmethod(this, delete_immediately); 1379 } 1380 } 1381 } 1382 } 1383 } 1384 1385 1386 // If this oop is not live, the nmethod can be unloaded. 1387 bool nmethod::can_unload(BoolObjectClosure* is_alive, oop* root, bool unloading_occurred) { 1388 assert(root != NULL, "just checking"); 1389 oop obj = *root; 1390 if (obj == NULL || is_alive->do_object_b(obj)) { 1391 return false; 1392 } 1393 1394 // If ScavengeRootsInCode is true, an nmethod might be unloaded 1395 // simply because one of its constant oops has gone dead. 1396 // No actual classes need to be unloaded in order for this to occur. 1397 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading"); 1398 make_unloaded(is_alive, obj); 1399 return true; 1400 } 1401 1402 // ------------------------------------------------------------------ 1403 // post_compiled_method_load_event 1404 // new method for install_code() path 1405 // Transfer information from compilation to jvmti 1406 void nmethod::post_compiled_method_load_event() { 1407 1408 Method* moop = method(); 1409 HOTSPOT_COMPILED_METHOD_LOAD( 1410 (char *) moop->klass_name()->bytes(), 1411 moop->klass_name()->utf8_length(), 1412 (char *) moop->name()->bytes(), 1413 moop->name()->utf8_length(), 1414 (char *) moop->signature()->bytes(), 1415 moop->signature()->utf8_length(), 1416 insts_begin(), insts_size()); 1417 1418 if (JvmtiExport::should_post_compiled_method_load() || 1419 JvmtiExport::should_post_compiled_method_unload()) { 1420 get_and_cache_jmethod_id(); 1421 } 1422 1423 if (JvmtiExport::should_post_compiled_method_load()) { 1424 // Let the Service thread (which is a real Java thread) post the event 1425 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); 1426 JvmtiDeferredEventQueue::enqueue( 1427 JvmtiDeferredEvent::compiled_method_load_event(this)); 1428 } 1429 } 1430 1431 jmethodID nmethod::get_and_cache_jmethod_id() { 1432 if (_jmethod_id == NULL) { 1433 // Cache the jmethod_id since it can no longer be looked up once the 1434 // method itself has been marked for unloading. 1435 _jmethod_id = method()->jmethod_id(); 1436 } 1437 return _jmethod_id; 1438 } 1439 1440 void nmethod::post_compiled_method_unload() { 1441 if (unload_reported()) { 1442 // During unloading we transition to unloaded and then to zombie 1443 // and the unloading is reported during the first transition. 1444 return; 1445 } 1446 1447 assert(_method != NULL && !is_unloaded(), "just checking"); 1448 DTRACE_METHOD_UNLOAD_PROBE(method()); 1449 1450 // If a JVMTI agent has enabled the CompiledMethodUnload event then 1451 // post the event. Sometime later this nmethod will be made a zombie 1452 // by the sweeper but the Method* will not be valid at that point. 1453 // If the _jmethod_id is null then no load event was ever requested 1454 // so don't bother posting the unload. The main reason for this is 1455 // that the jmethodID is a weak reference to the Method* so if 1456 // it's being unloaded there's no way to look it up since the weak 1457 // ref will have been cleared. 1458 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) { 1459 assert(!unload_reported(), "already unloaded"); 1460 JvmtiDeferredEvent event = 1461 JvmtiDeferredEvent::compiled_method_unload_event(this, 1462 _jmethod_id, insts_begin()); 1463 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); 1464 JvmtiDeferredEventQueue::enqueue(event); 1465 } 1466 1467 // The JVMTI CompiledMethodUnload event can be enabled or disabled at 1468 // any time. As the nmethod is being unloaded now we mark it has 1469 // having the unload event reported - this will ensure that we don't 1470 // attempt to report the event in the unlikely scenario where the 1471 // event is enabled at the time the nmethod is made a zombie. 1472 set_unload_reported(); 1473 } 1474 1475 bool nmethod::unload_if_dead_at(RelocIterator* iter_at_oop, BoolObjectClosure *is_alive, bool unloading_occurred) { 1476 assert(iter_at_oop->type() == relocInfo::oop_type, "Wrong relocation type"); 1477 1478 oop_Relocation* r = iter_at_oop->oop_reloc(); 1479 // Traverse those oops directly embedded in the code. 1480 // Other oops (oop_index>0) are seen as part of scopes_oops. 1481 assert(1 == (r->oop_is_immediate()) + 1482 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 1483 "oop must be found in exactly one place"); 1484 if (r->oop_is_immediate() && r->oop_value() != NULL) { 1485 // Unload this nmethod if the oop is dead. 1486 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) { 1487 return true;; 1488 } 1489 } 1490 1491 return false; 1492 } 1493 1494 bool nmethod::do_unloading_scopes(BoolObjectClosure* is_alive, bool unloading_occurred) { 1495 // Scopes 1496 for (oop* p = oops_begin(); p < oops_end(); p++) { 1497 if (*p == Universe::non_oop_word()) continue; // skip non-oops 1498 if (can_unload(is_alive, p, unloading_occurred)) { 1499 return true; 1500 } 1501 } 1502 return false; 1503 } 1504 1505 bool nmethod::do_unloading_oops(address low_boundary, BoolObjectClosure* is_alive, bool unloading_occurred) { 1506 // Compiled code 1507 { 1508 RelocIterator iter(this, low_boundary); 1509 while (iter.next()) { 1510 if (iter.type() == relocInfo::oop_type) { 1511 if (unload_if_dead_at(&iter, is_alive, unloading_occurred)) { 1512 return true; 1513 } 1514 } 1515 } 1516 } 1517 1518 return do_unloading_scopes(is_alive, unloading_occurred); 1519 } 1520 1521 #if INCLUDE_JVMCI 1522 bool nmethod::do_unloading_jvmci(BoolObjectClosure* is_alive, bool unloading_occurred) { 1523 bool is_unloaded = false; 1524 // Follow JVMCI method 1525 BarrierSet* bs = Universe::heap()->barrier_set(); 1526 if (_jvmci_installed_code != NULL) { 1527 if (_jvmci_installed_code->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(_jvmci_installed_code)) { 1528 if (!is_alive->do_object_b(_jvmci_installed_code)) { 1529 clear_jvmci_installed_code(); 1530 } 1531 } else { 1532 if (can_unload(is_alive, (oop*)&_jvmci_installed_code, unloading_occurred)) { 1533 return true; 1534 } 1535 } 1536 } 1537 1538 if (_speculation_log != NULL) { 1539 if (!is_alive->do_object_b(_speculation_log)) { 1540 bs->write_ref_nmethod_pre(&_speculation_log, this); 1541 _speculation_log = NULL; 1542 bs->write_ref_nmethod_post(&_speculation_log, this); 1543 } 1544 } 1545 return is_unloaded; 1546 } 1547 #endif 1548 1549 // Iterate over metadata calling this function. Used by RedefineClasses 1550 void nmethod::metadata_do(void f(Metadata*)) { 1551 address low_boundary = verified_entry_point(); 1552 if (is_not_entrant()) { 1553 low_boundary += NativeJump::instruction_size; 1554 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1555 // (See comment above.) 1556 } 1557 { 1558 // Visit all immediate references that are embedded in the instruction stream. 1559 RelocIterator iter(this, low_boundary); 1560 while (iter.next()) { 1561 if (iter.type() == relocInfo::metadata_type ) { 1562 metadata_Relocation* r = iter.metadata_reloc(); 1563 // In this metadata, we must only follow those metadatas directly embedded in 1564 // the code. Other metadatas (oop_index>0) are seen as part of 1565 // the metadata section below. 1566 assert(1 == (r->metadata_is_immediate()) + 1567 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()), 1568 "metadata must be found in exactly one place"); 1569 if (r->metadata_is_immediate() && r->metadata_value() != NULL) { 1570 Metadata* md = r->metadata_value(); 1571 if (md != _method) f(md); 1572 } 1573 } else if (iter.type() == relocInfo::virtual_call_type) { 1574 // Check compiledIC holders associated with this nmethod 1575 CompiledIC *ic = CompiledIC_at(&iter); 1576 if (ic->is_icholder_call()) { 1577 CompiledICHolder* cichk = ic->cached_icholder(); 1578 f(cichk->holder_method()); 1579 f(cichk->holder_klass()); 1580 } else { 1581 Metadata* ic_oop = ic->cached_metadata(); 1582 if (ic_oop != NULL) { 1583 f(ic_oop); 1584 } 1585 } 1586 } 1587 } 1588 } 1589 1590 // Visit the metadata section 1591 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) { 1592 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops 1593 Metadata* md = *p; 1594 f(md); 1595 } 1596 1597 // Visit metadata not embedded in the other places. 1598 if (_method != NULL) f(_method); 1599 } 1600 1601 void nmethod::oops_do(OopClosure* f, bool allow_zombie) { 1602 // make sure the oops ready to receive visitors 1603 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod"); 1604 assert(!is_unloaded(), "should not call follow on unloaded nmethod"); 1605 1606 // If the method is not entrant or zombie then a JMP is plastered over the 1607 // first few bytes. If an oop in the old code was there, that oop 1608 // should not get GC'd. Skip the first few bytes of oops on 1609 // not-entrant methods. 1610 address low_boundary = verified_entry_point(); 1611 if (is_not_entrant()) { 1612 low_boundary += NativeJump::instruction_size; 1613 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1614 // (See comment above.) 1615 } 1616 1617 #if INCLUDE_JVMCI 1618 if (_jvmci_installed_code != NULL) { 1619 f->do_oop((oop*) &_jvmci_installed_code); 1620 } 1621 if (_speculation_log != NULL) { 1622 f->do_oop((oop*) &_speculation_log); 1623 } 1624 #endif 1625 1626 RelocIterator iter(this, low_boundary); 1627 1628 while (iter.next()) { 1629 if (iter.type() == relocInfo::oop_type ) { 1630 oop_Relocation* r = iter.oop_reloc(); 1631 // In this loop, we must only follow those oops directly embedded in 1632 // the code. Other oops (oop_index>0) are seen as part of scopes_oops. 1633 assert(1 == (r->oop_is_immediate()) + 1634 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 1635 "oop must be found in exactly one place"); 1636 if (r->oop_is_immediate() && r->oop_value() != NULL) { 1637 f->do_oop(r->oop_addr()); 1638 } 1639 } 1640 } 1641 1642 // Scopes 1643 // This includes oop constants not inlined in the code stream. 1644 for (oop* p = oops_begin(); p < oops_end(); p++) { 1645 if (*p == Universe::non_oop_word()) continue; // skip non-oops 1646 f->do_oop(p); 1647 } 1648 } 1649 1650 #define NMETHOD_SENTINEL ((nmethod*)badAddress) 1651 1652 nmethod* volatile nmethod::_oops_do_mark_nmethods; 1653 1654 // An nmethod is "marked" if its _mark_link is set non-null. 1655 // Even if it is the end of the linked list, it will have a non-null link value, 1656 // as long as it is on the list. 1657 // This code must be MP safe, because it is used from parallel GC passes. 1658 bool nmethod::test_set_oops_do_mark() { 1659 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called"); 1660 nmethod* observed_mark_link = _oops_do_mark_link; 1661 if (observed_mark_link == NULL) { 1662 // Claim this nmethod for this thread to mark. 1663 observed_mark_link = (nmethod*) 1664 Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_link, NULL); 1665 if (observed_mark_link == NULL) { 1666 1667 // Atomically append this nmethod (now claimed) to the head of the list: 1668 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods; 1669 for (;;) { 1670 nmethod* required_mark_nmethods = observed_mark_nmethods; 1671 _oops_do_mark_link = required_mark_nmethods; 1672 observed_mark_nmethods = (nmethod*) 1673 Atomic::cmpxchg_ptr(this, &_oops_do_mark_nmethods, required_mark_nmethods); 1674 if (observed_mark_nmethods == required_mark_nmethods) 1675 break; 1676 } 1677 // Mark was clear when we first saw this guy. 1678 if (TraceScavenge) { print_on(tty, "oops_do, mark"); } 1679 return false; 1680 } 1681 } 1682 // On fall through, another racing thread marked this nmethod before we did. 1683 return true; 1684 } 1685 1686 void nmethod::oops_do_marking_prologue() { 1687 if (TraceScavenge) { tty->print_cr("[oops_do_marking_prologue"); } 1688 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row"); 1689 // We use cmpxchg_ptr instead of regular assignment here because the user 1690 // may fork a bunch of threads, and we need them all to see the same state. 1691 void* observed = Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, NULL); 1692 guarantee(observed == NULL, "no races in this sequential code"); 1693 } 1694 1695 void nmethod::oops_do_marking_epilogue() { 1696 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row"); 1697 nmethod* cur = _oops_do_mark_nmethods; 1698 while (cur != NMETHOD_SENTINEL) { 1699 assert(cur != NULL, "not NULL-terminated"); 1700 nmethod* next = cur->_oops_do_mark_link; 1701 cur->_oops_do_mark_link = NULL; 1702 DEBUG_ONLY(cur->verify_oop_relocations()); 1703 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark")); 1704 cur = next; 1705 } 1706 void* required = _oops_do_mark_nmethods; 1707 void* observed = Atomic::cmpxchg_ptr(NULL, &_oops_do_mark_nmethods, required); 1708 guarantee(observed == required, "no races in this sequential code"); 1709 if (TraceScavenge) { tty->print_cr("oops_do_marking_epilogue]"); } 1710 } 1711 1712 class DetectScavengeRoot: public OopClosure { 1713 bool _detected_scavenge_root; 1714 public: 1715 DetectScavengeRoot() : _detected_scavenge_root(false) 1716 { NOT_PRODUCT(_print_nm = NULL); } 1717 bool detected_scavenge_root() { return _detected_scavenge_root; } 1718 virtual void do_oop(oop* p) { 1719 if ((*p) != NULL && (*p)->is_scavengable()) { 1720 NOT_PRODUCT(maybe_print(p)); 1721 _detected_scavenge_root = true; 1722 } 1723 } 1724 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 1725 1726 #ifndef PRODUCT 1727 nmethod* _print_nm; 1728 void maybe_print(oop* p) { 1729 if (_print_nm == NULL) return; 1730 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root"); 1731 tty->print_cr("" PTR_FORMAT "[offset=%d] detected scavengable oop " PTR_FORMAT " (found at " PTR_FORMAT ")", 1732 p2i(_print_nm), (int)((intptr_t)p - (intptr_t)_print_nm), 1733 p2i(*p), p2i(p)); 1734 (*p)->print(); 1735 } 1736 #endif //PRODUCT 1737 }; 1738 1739 bool nmethod::detect_scavenge_root_oops() { 1740 DetectScavengeRoot detect_scavenge_root; 1741 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this); 1742 oops_do(&detect_scavenge_root); 1743 return detect_scavenge_root.detected_scavenge_root(); 1744 } 1745 1746 inline bool includes(void* p, void* from, void* to) { 1747 return from <= p && p < to; 1748 } 1749 1750 1751 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) { 1752 assert(count >= 2, "must be sentinel values, at least"); 1753 1754 #ifdef ASSERT 1755 // must be sorted and unique; we do a binary search in find_pc_desc() 1756 int prev_offset = pcs[0].pc_offset(); 1757 assert(prev_offset == PcDesc::lower_offset_limit, 1758 "must start with a sentinel"); 1759 for (int i = 1; i < count; i++) { 1760 int this_offset = pcs[i].pc_offset(); 1761 assert(this_offset > prev_offset, "offsets must be sorted"); 1762 prev_offset = this_offset; 1763 } 1764 assert(prev_offset == PcDesc::upper_offset_limit, 1765 "must end with a sentinel"); 1766 #endif //ASSERT 1767 1768 // Search for MethodHandle invokes and tag the nmethod. 1769 for (int i = 0; i < count; i++) { 1770 if (pcs[i].is_method_handle_invoke()) { 1771 set_has_method_handle_invokes(true); 1772 break; 1773 } 1774 } 1775 assert(has_method_handle_invokes() == (_deopt_mh_handler_begin != NULL), "must have deopt mh handler"); 1776 1777 int size = count * sizeof(PcDesc); 1778 assert(scopes_pcs_size() >= size, "oob"); 1779 memcpy(scopes_pcs_begin(), pcs, size); 1780 1781 // Adjust the final sentinel downward. 1782 PcDesc* last_pc = &scopes_pcs_begin()[count-1]; 1783 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity"); 1784 last_pc->set_pc_offset(content_size() + 1); 1785 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) { 1786 // Fill any rounding gaps with copies of the last record. 1787 last_pc[1] = last_pc[0]; 1788 } 1789 // The following assert could fail if sizeof(PcDesc) is not 1790 // an integral multiple of oopSize (the rounding term). 1791 // If it fails, change the logic to always allocate a multiple 1792 // of sizeof(PcDesc), and fill unused words with copies of *last_pc. 1793 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly"); 1794 } 1795 1796 void nmethod::copy_scopes_data(u_char* buffer, int size) { 1797 assert(scopes_data_size() >= size, "oob"); 1798 memcpy(scopes_data_begin(), buffer, size); 1799 } 1800 1801 #ifdef ASSERT 1802 static PcDesc* linear_search(const PcDescSearch& search, int pc_offset, bool approximate) { 1803 PcDesc* lower = search.scopes_pcs_begin(); 1804 PcDesc* upper = search.scopes_pcs_end(); 1805 lower += 1; // exclude initial sentinel 1806 PcDesc* res = NULL; 1807 for (PcDesc* p = lower; p < upper; p++) { 1808 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc 1809 if (match_desc(p, pc_offset, approximate)) { 1810 if (res == NULL) 1811 res = p; 1812 else 1813 res = (PcDesc*) badAddress; 1814 } 1815 } 1816 return res; 1817 } 1818 #endif 1819 1820 1821 // Finds a PcDesc with real-pc equal to "pc" 1822 PcDesc* PcDescContainer::find_pc_desc_internal(address pc, bool approximate, const PcDescSearch& search) { 1823 address base_address = search.code_begin(); 1824 if ((pc < base_address) || 1825 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) { 1826 return NULL; // PC is wildly out of range 1827 } 1828 int pc_offset = (int) (pc - base_address); 1829 1830 // Check the PcDesc cache if it contains the desired PcDesc 1831 // (This as an almost 100% hit rate.) 1832 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate); 1833 if (res != NULL) { 1834 assert(res == linear_search(search, pc_offset, approximate), "cache ok"); 1835 return res; 1836 } 1837 1838 // Fallback algorithm: quasi-linear search for the PcDesc 1839 // Find the last pc_offset less than the given offset. 1840 // The successor must be the required match, if there is a match at all. 1841 // (Use a fixed radix to avoid expensive affine pointer arithmetic.) 1842 PcDesc* lower = search.scopes_pcs_begin(); 1843 PcDesc* upper = search.scopes_pcs_end(); 1844 upper -= 1; // exclude final sentinel 1845 if (lower >= upper) return NULL; // native method; no PcDescs at all 1846 1847 #define assert_LU_OK \ 1848 /* invariant on lower..upper during the following search: */ \ 1849 assert(lower->pc_offset() < pc_offset, "sanity"); \ 1850 assert(upper->pc_offset() >= pc_offset, "sanity") 1851 assert_LU_OK; 1852 1853 // Use the last successful return as a split point. 1854 PcDesc* mid = _pc_desc_cache.last_pc_desc(); 1855 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 1856 if (mid->pc_offset() < pc_offset) { 1857 lower = mid; 1858 } else { 1859 upper = mid; 1860 } 1861 1862 // Take giant steps at first (4096, then 256, then 16, then 1) 1863 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1); 1864 const int RADIX = (1 << LOG2_RADIX); 1865 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) { 1866 while ((mid = lower + step) < upper) { 1867 assert_LU_OK; 1868 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 1869 if (mid->pc_offset() < pc_offset) { 1870 lower = mid; 1871 } else { 1872 upper = mid; 1873 break; 1874 } 1875 } 1876 assert_LU_OK; 1877 } 1878 1879 // Sneak up on the value with a linear search of length ~16. 1880 while (true) { 1881 assert_LU_OK; 1882 mid = lower + 1; 1883 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 1884 if (mid->pc_offset() < pc_offset) { 1885 lower = mid; 1886 } else { 1887 upper = mid; 1888 break; 1889 } 1890 } 1891 #undef assert_LU_OK 1892 1893 if (match_desc(upper, pc_offset, approximate)) { 1894 assert(upper == linear_search(search, pc_offset, approximate), "search ok"); 1895 _pc_desc_cache.add_pc_desc(upper); 1896 return upper; 1897 } else { 1898 assert(NULL == linear_search(search, pc_offset, approximate), "search ok"); 1899 return NULL; 1900 } 1901 } 1902 1903 1904 void nmethod::check_all_dependencies(DepChange& changes) { 1905 // Checked dependencies are allocated into this ResourceMark 1906 ResourceMark rm; 1907 1908 // Turn off dependency tracing while actually testing dependencies. 1909 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) ); 1910 1911 typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash, 1912 &DependencySignature::equals, 11027> DepTable; 1913 1914 DepTable* table = new DepTable(); 1915 1916 // Iterate over live nmethods and check dependencies of all nmethods that are not 1917 // marked for deoptimization. A particular dependency is only checked once. 1918 NMethodIterator iter; 1919 while(iter.next()) { 1920 nmethod* nm = iter.method(); 1921 // Only notify for live nmethods 1922 if (nm->is_alive() && !nm->is_marked_for_deoptimization()) { 1923 for (Dependencies::DepStream deps(nm); deps.next(); ) { 1924 // Construct abstraction of a dependency. 1925 DependencySignature* current_sig = new DependencySignature(deps); 1926 1927 // Determine if dependency is already checked. table->put(...) returns 1928 // 'true' if the dependency is added (i.e., was not in the hashtable). 1929 if (table->put(*current_sig, 1)) { 1930 if (deps.check_dependency() != NULL) { 1931 // Dependency checking failed. Print out information about the failed 1932 // dependency and finally fail with an assert. We can fail here, since 1933 // dependency checking is never done in a product build. 1934 tty->print_cr("Failed dependency:"); 1935 changes.print(); 1936 nm->print(); 1937 nm->print_dependencies(); 1938 assert(false, "Should have been marked for deoptimization"); 1939 } 1940 } 1941 } 1942 } 1943 } 1944 } 1945 1946 bool nmethod::check_dependency_on(DepChange& changes) { 1947 // What has happened: 1948 // 1) a new class dependee has been added 1949 // 2) dependee and all its super classes have been marked 1950 bool found_check = false; // set true if we are upset 1951 for (Dependencies::DepStream deps(this); deps.next(); ) { 1952 // Evaluate only relevant dependencies. 1953 if (deps.spot_check_dependency_at(changes) != NULL) { 1954 found_check = true; 1955 NOT_DEBUG(break); 1956 } 1957 } 1958 return found_check; 1959 } 1960 1961 bool nmethod::is_evol_dependent_on(Klass* dependee) { 1962 InstanceKlass *dependee_ik = InstanceKlass::cast(dependee); 1963 Array<Method*>* dependee_methods = dependee_ik->methods(); 1964 for (Dependencies::DepStream deps(this); deps.next(); ) { 1965 if (deps.type() == Dependencies::evol_method) { 1966 Method* method = deps.method_argument(0); 1967 for (int j = 0; j < dependee_methods->length(); j++) { 1968 if (dependee_methods->at(j) == method) { 1969 if (log_is_enabled(Debug, redefine, class, nmethod)) { 1970 ResourceMark rm; 1971 log_debug(redefine, class, nmethod) 1972 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)", 1973 _method->method_holder()->external_name(), 1974 _method->name()->as_C_string(), 1975 _method->signature()->as_C_string(), 1976 compile_id(), 1977 method->method_holder()->external_name(), 1978 method->name()->as_C_string(), 1979 method->signature()->as_C_string()); 1980 } 1981 if (TraceDependencies || LogCompilation) 1982 deps.log_dependency(dependee); 1983 return true; 1984 } 1985 } 1986 } 1987 } 1988 return false; 1989 } 1990 1991 // Called from mark_for_deoptimization, when dependee is invalidated. 1992 bool nmethod::is_dependent_on_method(Method* dependee) { 1993 for (Dependencies::DepStream deps(this); deps.next(); ) { 1994 if (deps.type() != Dependencies::evol_method) 1995 continue; 1996 Method* method = deps.method_argument(0); 1997 if (method == dependee) return true; 1998 } 1999 return false; 2000 } 2001 2002 2003 bool nmethod::is_patchable_at(address instr_addr) { 2004 assert(insts_contains(instr_addr), "wrong nmethod used"); 2005 if (is_zombie()) { 2006 // a zombie may never be patched 2007 return false; 2008 } 2009 return true; 2010 } 2011 2012 2013 address nmethod::continuation_for_implicit_exception(address pc) { 2014 // Exception happened outside inline-cache check code => we are inside 2015 // an active nmethod => use cpc to determine a return address 2016 int exception_offset = pc - code_begin(); 2017 int cont_offset = ImplicitExceptionTable(this).at( exception_offset ); 2018 #ifdef ASSERT 2019 if (cont_offset == 0) { 2020 Thread* thread = Thread::current(); 2021 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY 2022 HandleMark hm(thread); 2023 ResourceMark rm(thread); 2024 CodeBlob* cb = CodeCache::find_blob(pc); 2025 assert(cb != NULL && cb == this, ""); 2026 ttyLocker ttyl; 2027 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, p2i(pc)); 2028 print(); 2029 method()->print_codes(); 2030 print_code(); 2031 print_pcs(); 2032 } 2033 #endif 2034 if (cont_offset == 0) { 2035 // Let the normal error handling report the exception 2036 return NULL; 2037 } 2038 return code_begin() + cont_offset; 2039 } 2040 2041 2042 2043 void nmethod_init() { 2044 // make sure you didn't forget to adjust the filler fields 2045 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word"); 2046 } 2047 2048 2049 //------------------------------------------------------------------------------------------- 2050 2051 2052 // QQQ might we make this work from a frame?? 2053 nmethodLocker::nmethodLocker(address pc) { 2054 CodeBlob* cb = CodeCache::find_blob(pc); 2055 guarantee(cb != NULL && cb->is_compiled(), "bad pc for a nmethod found"); 2056 _nm = cb->as_compiled_method(); 2057 lock_nmethod(_nm); 2058 } 2059 2060 // Only JvmtiDeferredEvent::compiled_method_unload_event() 2061 // should pass zombie_ok == true. 2062 void nmethodLocker::lock_nmethod(CompiledMethod* cm, bool zombie_ok) { 2063 if (cm == NULL) return; 2064 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method 2065 nmethod* nm = cm->as_nmethod(); 2066 Atomic::inc(&nm->_lock_count); 2067 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method"); 2068 } 2069 2070 void nmethodLocker::unlock_nmethod(CompiledMethod* cm) { 2071 if (cm == NULL) return; 2072 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method 2073 nmethod* nm = cm->as_nmethod(); 2074 Atomic::dec(&nm->_lock_count); 2075 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock"); 2076 } 2077 2078 2079 // ----------------------------------------------------------------------------- 2080 // Verification 2081 2082 class VerifyOopsClosure: public OopClosure { 2083 nmethod* _nm; 2084 bool _ok; 2085 public: 2086 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { } 2087 bool ok() { return _ok; } 2088 virtual void do_oop(oop* p) { 2089 if ((*p) == NULL || (*p)->is_oop()) return; 2090 if (_ok) { 2091 _nm->print_nmethod(true); 2092 _ok = false; 2093 } 2094 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)", 2095 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm)); 2096 } 2097 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2098 }; 2099 2100 void nmethod::verify() { 2101 2102 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant 2103 // seems odd. 2104 2105 if (is_zombie() || is_not_entrant() || is_unloaded()) 2106 return; 2107 2108 // Make sure all the entry points are correctly aligned for patching. 2109 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point()); 2110 2111 // assert(method()->is_oop(), "must be valid"); 2112 2113 ResourceMark rm; 2114 2115 if (!CodeCache::contains(this)) { 2116 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this)); 2117 } 2118 2119 if(is_native_method() ) 2120 return; 2121 2122 nmethod* nm = CodeCache::find_nmethod(verified_entry_point()); 2123 if (nm != this) { 2124 fatal("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this)); 2125 } 2126 2127 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2128 if (! p->verify(this)) { 2129 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this)); 2130 } 2131 } 2132 2133 VerifyOopsClosure voc(this); 2134 oops_do(&voc); 2135 assert(voc.ok(), "embedded oops must be OK"); 2136 verify_scavenge_root_oops(); 2137 2138 verify_scopes(); 2139 } 2140 2141 2142 void nmethod::verify_interrupt_point(address call_site) { 2143 // Verify IC only when nmethod installation is finished. 2144 bool is_installed = (method()->code() == this) // nmethod is in state 'in_use' and installed 2145 || !this->is_in_use(); // nmethod is installed, but not in 'in_use' state 2146 if (is_installed) { 2147 Thread *cur = Thread::current(); 2148 if (CompiledIC_lock->owner() == cur || 2149 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) && 2150 SafepointSynchronize::is_at_safepoint())) { 2151 CompiledIC_at(this, call_site); 2152 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); 2153 } else { 2154 MutexLocker ml_verify (CompiledIC_lock); 2155 CompiledIC_at(this, call_site); 2156 } 2157 } 2158 2159 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address()); 2160 assert(pd != NULL, "PcDesc must exist"); 2161 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(), 2162 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(), 2163 pd->return_oop()); 2164 !sd->is_top(); sd = sd->sender()) { 2165 sd->verify(); 2166 } 2167 } 2168 2169 void nmethod::verify_scopes() { 2170 if( !method() ) return; // Runtime stubs have no scope 2171 if (method()->is_native()) return; // Ignore stub methods. 2172 // iterate through all interrupt point 2173 // and verify the debug information is valid. 2174 RelocIterator iter((nmethod*)this); 2175 while (iter.next()) { 2176 address stub = NULL; 2177 switch (iter.type()) { 2178 case relocInfo::virtual_call_type: 2179 verify_interrupt_point(iter.addr()); 2180 break; 2181 case relocInfo::opt_virtual_call_type: 2182 stub = iter.opt_virtual_call_reloc()->static_stub(false); 2183 verify_interrupt_point(iter.addr()); 2184 break; 2185 case relocInfo::static_call_type: 2186 stub = iter.static_call_reloc()->static_stub(false); 2187 //verify_interrupt_point(iter.addr()); 2188 break; 2189 case relocInfo::runtime_call_type: 2190 case relocInfo::runtime_call_w_cp_type: 2191 address destination = iter.reloc()->value(); 2192 // Right now there is no way to find out which entries support 2193 // an interrupt point. It would be nice if we had this 2194 // information in a table. 2195 break; 2196 } 2197 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section"); 2198 } 2199 } 2200 2201 2202 // ----------------------------------------------------------------------------- 2203 // Non-product code 2204 #ifndef PRODUCT 2205 2206 class DebugScavengeRoot: public OopClosure { 2207 nmethod* _nm; 2208 bool _ok; 2209 public: 2210 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { } 2211 bool ok() { return _ok; } 2212 virtual void do_oop(oop* p) { 2213 if ((*p) == NULL || !(*p)->is_scavengable()) return; 2214 if (_ok) { 2215 _nm->print_nmethod(true); 2216 _ok = false; 2217 } 2218 tty->print_cr("*** scavengable oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)", 2219 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm)); 2220 (*p)->print(); 2221 } 2222 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2223 }; 2224 2225 void nmethod::verify_scavenge_root_oops() { 2226 if (UseG1GC) { 2227 return; 2228 } 2229 2230 if (!on_scavenge_root_list()) { 2231 // Actually look inside, to verify the claim that it's clean. 2232 DebugScavengeRoot debug_scavenge_root(this); 2233 oops_do(&debug_scavenge_root); 2234 if (!debug_scavenge_root.ok()) 2235 fatal("found an unadvertised bad scavengable oop in the code cache"); 2236 } 2237 assert(scavenge_root_not_marked(), ""); 2238 } 2239 2240 #endif // PRODUCT 2241 2242 // Printing operations 2243 2244 void nmethod::print() const { 2245 ResourceMark rm; 2246 ttyLocker ttyl; // keep the following output all in one block 2247 2248 tty->print("Compiled method "); 2249 2250 if (is_compiled_by_c1()) { 2251 tty->print("(c1) "); 2252 } else if (is_compiled_by_c2()) { 2253 tty->print("(c2) "); 2254 } else if (is_compiled_by_shark()) { 2255 tty->print("(shark) "); 2256 } else if (is_compiled_by_jvmci()) { 2257 tty->print("(JVMCI) "); 2258 } else { 2259 tty->print("(nm) "); 2260 } 2261 2262 print_on(tty, NULL); 2263 2264 if (WizardMode) { 2265 tty->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this)); 2266 tty->print(" for method " INTPTR_FORMAT , p2i(method())); 2267 tty->print(" { "); 2268 tty->print_cr("%s ", state()); 2269 if (on_scavenge_root_list()) tty->print("scavenge_root "); 2270 tty->print_cr("}:"); 2271 } 2272 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2273 p2i(this), 2274 p2i(this) + size(), 2275 size()); 2276 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2277 p2i(relocation_begin()), 2278 p2i(relocation_end()), 2279 relocation_size()); 2280 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2281 p2i(consts_begin()), 2282 p2i(consts_end()), 2283 consts_size()); 2284 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2285 p2i(insts_begin()), 2286 p2i(insts_end()), 2287 insts_size()); 2288 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2289 p2i(stub_begin()), 2290 p2i(stub_end()), 2291 stub_size()); 2292 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2293 p2i(oops_begin()), 2294 p2i(oops_end()), 2295 oops_size()); 2296 if (metadata_size () > 0) tty->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2297 p2i(metadata_begin()), 2298 p2i(metadata_end()), 2299 metadata_size()); 2300 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2301 p2i(scopes_data_begin()), 2302 p2i(scopes_data_end()), 2303 scopes_data_size()); 2304 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2305 p2i(scopes_pcs_begin()), 2306 p2i(scopes_pcs_end()), 2307 scopes_pcs_size()); 2308 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2309 p2i(dependencies_begin()), 2310 p2i(dependencies_end()), 2311 dependencies_size()); 2312 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2313 p2i(handler_table_begin()), 2314 p2i(handler_table_end()), 2315 handler_table_size()); 2316 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2317 p2i(nul_chk_table_begin()), 2318 p2i(nul_chk_table_end()), 2319 nul_chk_table_size()); 2320 } 2321 2322 #ifndef PRODUCT 2323 2324 void nmethod::print_scopes() { 2325 // Find the first pc desc for all scopes in the code and print it. 2326 ResourceMark rm; 2327 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2328 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null) 2329 continue; 2330 2331 ScopeDesc* sd = scope_desc_at(p->real_pc(this)); 2332 while (sd != NULL) { 2333 sd->print_on(tty, p); 2334 sd = sd->sender(); 2335 } 2336 } 2337 } 2338 2339 void nmethod::print_dependencies() { 2340 ResourceMark rm; 2341 ttyLocker ttyl; // keep the following output all in one block 2342 tty->print_cr("Dependencies:"); 2343 for (Dependencies::DepStream deps(this); deps.next(); ) { 2344 deps.print_dependency(); 2345 Klass* ctxk = deps.context_type(); 2346 if (ctxk != NULL) { 2347 if (ctxk->is_instance_klass() && InstanceKlass::cast(ctxk)->is_dependent_nmethod(this)) { 2348 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name()); 2349 } 2350 } 2351 deps.log_dependency(); // put it into the xml log also 2352 } 2353 } 2354 2355 2356 void nmethod::print_relocations() { 2357 ResourceMark m; // in case methods get printed via the debugger 2358 tty->print_cr("relocations:"); 2359 RelocIterator iter(this); 2360 iter.print(); 2361 } 2362 2363 2364 void nmethod::print_pcs() { 2365 ResourceMark m; // in case methods get printed via debugger 2366 tty->print_cr("pc-bytecode offsets:"); 2367 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2368 p->print(this); 2369 } 2370 } 2371 2372 void nmethod::print_recorded_oops() { 2373 tty->print_cr("Recorded oops:"); 2374 for (int i = 0; i < oops_count(); i++) { 2375 oop o = oop_at(i); 2376 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(o)); 2377 if (o == (oop)Universe::non_oop_word()) { 2378 tty->print("non-oop word"); 2379 } else { 2380 o->print_value(); 2381 } 2382 tty->cr(); 2383 } 2384 } 2385 2386 void nmethod::print_recorded_metadata() { 2387 tty->print_cr("Recorded metadata:"); 2388 for (int i = 0; i < metadata_count(); i++) { 2389 Metadata* m = metadata_at(i); 2390 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(m)); 2391 if (m == (Metadata*)Universe::non_oop_word()) { 2392 tty->print("non-metadata word"); 2393 } else { 2394 m->print_value_on_maybe_null(tty); 2395 } 2396 tty->cr(); 2397 } 2398 } 2399 2400 #endif // PRODUCT 2401 2402 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) { 2403 RelocIterator iter(this, begin, end); 2404 bool have_one = false; 2405 while (iter.next()) { 2406 have_one = true; 2407 switch (iter.type()) { 2408 case relocInfo::none: return "no_reloc"; 2409 case relocInfo::oop_type: { 2410 stringStream st; 2411 oop_Relocation* r = iter.oop_reloc(); 2412 oop obj = r->oop_value(); 2413 st.print("oop("); 2414 if (obj == NULL) st.print("NULL"); 2415 else obj->print_value_on(&st); 2416 st.print(")"); 2417 return st.as_string(); 2418 } 2419 case relocInfo::metadata_type: { 2420 stringStream st; 2421 metadata_Relocation* r = iter.metadata_reloc(); 2422 Metadata* obj = r->metadata_value(); 2423 st.print("metadata("); 2424 if (obj == NULL) st.print("NULL"); 2425 else obj->print_value_on(&st); 2426 st.print(")"); 2427 return st.as_string(); 2428 } 2429 case relocInfo::runtime_call_type: 2430 case relocInfo::runtime_call_w_cp_type: { 2431 stringStream st; 2432 st.print("runtime_call"); 2433 CallRelocation* r = (CallRelocation*)iter.reloc(); 2434 address dest = r->destination(); 2435 CodeBlob* cb = CodeCache::find_blob(dest); 2436 if (cb != NULL) { 2437 st.print(" %s", cb->name()); 2438 } else { 2439 ResourceMark rm; 2440 const int buflen = 1024; 2441 char* buf = NEW_RESOURCE_ARRAY(char, buflen); 2442 int offset; 2443 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) { 2444 st.print(" %s", buf); 2445 if (offset != 0) { 2446 st.print("+%d", offset); 2447 } 2448 } 2449 } 2450 return st.as_string(); 2451 } 2452 case relocInfo::virtual_call_type: { 2453 stringStream st; 2454 st.print_raw("virtual_call"); 2455 virtual_call_Relocation* r = iter.virtual_call_reloc(); 2456 Method* m = r->method_value(); 2457 if (m != NULL) { 2458 assert(m->is_method(), ""); 2459 m->print_short_name(&st); 2460 } 2461 return st.as_string(); 2462 } 2463 case relocInfo::opt_virtual_call_type: { 2464 stringStream st; 2465 st.print_raw("optimized virtual_call"); 2466 opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc(); 2467 Method* m = r->method_value(); 2468 if (m != NULL) { 2469 assert(m->is_method(), ""); 2470 m->print_short_name(&st); 2471 } 2472 return st.as_string(); 2473 } 2474 case relocInfo::static_call_type: { 2475 stringStream st; 2476 st.print_raw("static_call"); 2477 static_call_Relocation* r = iter.static_call_reloc(); 2478 Method* m = r->method_value(); 2479 if (m != NULL) { 2480 assert(m->is_method(), ""); 2481 m->print_short_name(&st); 2482 } 2483 return st.as_string(); 2484 } 2485 case relocInfo::static_stub_type: return "static_stub"; 2486 case relocInfo::external_word_type: return "external_word"; 2487 case relocInfo::internal_word_type: return "internal_word"; 2488 case relocInfo::section_word_type: return "section_word"; 2489 case relocInfo::poll_type: return "poll"; 2490 case relocInfo::poll_return_type: return "poll_return"; 2491 case relocInfo::type_mask: return "type_bit_mask"; 2492 } 2493 } 2494 return have_one ? "other" : NULL; 2495 } 2496 2497 // Return a the last scope in (begin..end] 2498 ScopeDesc* nmethod::scope_desc_in(address begin, address end) { 2499 PcDesc* p = pc_desc_near(begin+1); 2500 if (p != NULL && p->real_pc(this) <= end) { 2501 return new ScopeDesc(this, p->scope_decode_offset(), 2502 p->obj_decode_offset(), p->should_reexecute(), p->rethrow_exception(), 2503 p->return_oop()); 2504 } 2505 return NULL; 2506 } 2507 2508 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const { 2509 if (block_begin == entry_point()) stream->print_cr("[Entry Point]"); 2510 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]"); 2511 if (JVMCI_ONLY(_exception_offset >= 0 &&) block_begin == exception_begin()) stream->print_cr("[Exception Handler]"); 2512 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]"); 2513 if (JVMCI_ONLY(_deopt_handler_begin != NULL &&) block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]"); 2514 2515 if (has_method_handle_invokes()) 2516 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]"); 2517 2518 if (block_begin == consts_begin()) stream->print_cr("[Constants]"); 2519 2520 if (block_begin == entry_point()) { 2521 methodHandle m = method(); 2522 if (m.not_null()) { 2523 stream->print(" # "); 2524 m->print_value_on(stream); 2525 stream->cr(); 2526 } 2527 if (m.not_null() && !is_osr_method()) { 2528 ResourceMark rm; 2529 int sizeargs = m->size_of_parameters(); 2530 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs); 2531 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs); 2532 { 2533 int sig_index = 0; 2534 if (!m->is_static()) 2535 sig_bt[sig_index++] = T_OBJECT; // 'this' 2536 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) { 2537 BasicType t = ss.type(); 2538 sig_bt[sig_index++] = t; 2539 if (type2size[t] == 2) { 2540 sig_bt[sig_index++] = T_VOID; 2541 } else { 2542 assert(type2size[t] == 1, "size is 1 or 2"); 2543 } 2544 } 2545 assert(sig_index == sizeargs, ""); 2546 } 2547 const char* spname = "sp"; // make arch-specific? 2548 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false); 2549 int stack_slot_offset = this->frame_size() * wordSize; 2550 int tab1 = 14, tab2 = 24; 2551 int sig_index = 0; 2552 int arg_index = (m->is_static() ? 0 : -1); 2553 bool did_old_sp = false; 2554 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) { 2555 bool at_this = (arg_index == -1); 2556 bool at_old_sp = false; 2557 BasicType t = (at_this ? T_OBJECT : ss.type()); 2558 assert(t == sig_bt[sig_index], "sigs in sync"); 2559 if (at_this) 2560 stream->print(" # this: "); 2561 else 2562 stream->print(" # parm%d: ", arg_index); 2563 stream->move_to(tab1); 2564 VMReg fst = regs[sig_index].first(); 2565 VMReg snd = regs[sig_index].second(); 2566 if (fst->is_reg()) { 2567 stream->print("%s", fst->name()); 2568 if (snd->is_valid()) { 2569 stream->print(":%s", snd->name()); 2570 } 2571 } else if (fst->is_stack()) { 2572 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset; 2573 if (offset == stack_slot_offset) at_old_sp = true; 2574 stream->print("[%s+0x%x]", spname, offset); 2575 } else { 2576 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd); 2577 } 2578 stream->print(" "); 2579 stream->move_to(tab2); 2580 stream->print("= "); 2581 if (at_this) { 2582 m->method_holder()->print_value_on(stream); 2583 } else { 2584 bool did_name = false; 2585 if (!at_this && ss.is_object()) { 2586 Symbol* name = ss.as_symbol_or_null(); 2587 if (name != NULL) { 2588 name->print_value_on(stream); 2589 did_name = true; 2590 } 2591 } 2592 if (!did_name) 2593 stream->print("%s", type2name(t)); 2594 } 2595 if (at_old_sp) { 2596 stream->print(" (%s of caller)", spname); 2597 did_old_sp = true; 2598 } 2599 stream->cr(); 2600 sig_index += type2size[t]; 2601 arg_index += 1; 2602 if (!at_this) ss.next(); 2603 } 2604 if (!did_old_sp) { 2605 stream->print(" # "); 2606 stream->move_to(tab1); 2607 stream->print("[%s+0x%x]", spname, stack_slot_offset); 2608 stream->print(" (%s of caller)", spname); 2609 stream->cr(); 2610 } 2611 } 2612 } 2613 } 2614 2615 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) { 2616 // First, find an oopmap in (begin, end]. 2617 // We use the odd half-closed interval so that oop maps and scope descs 2618 // which are tied to the byte after a call are printed with the call itself. 2619 address base = code_begin(); 2620 ImmutableOopMapSet* oms = oop_maps(); 2621 if (oms != NULL) { 2622 for (int i = 0, imax = oms->count(); i < imax; i++) { 2623 const ImmutableOopMapPair* pair = oms->pair_at(i); 2624 const ImmutableOopMap* om = pair->get_from(oms); 2625 address pc = base + pair->pc_offset(); 2626 if (pc > begin) { 2627 if (pc <= end) { 2628 st->move_to(column); 2629 st->print("; "); 2630 om->print_on(st); 2631 } 2632 break; 2633 } 2634 } 2635 } 2636 2637 // Print any debug info present at this pc. 2638 ScopeDesc* sd = scope_desc_in(begin, end); 2639 if (sd != NULL) { 2640 st->move_to(column); 2641 if (sd->bci() == SynchronizationEntryBCI) { 2642 st->print(";*synchronization entry"); 2643 } else { 2644 if (sd->method() == NULL) { 2645 st->print("method is NULL"); 2646 } else if (sd->method()->is_native()) { 2647 st->print("method is native"); 2648 } else { 2649 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci()); 2650 st->print(";*%s", Bytecodes::name(bc)); 2651 switch (bc) { 2652 case Bytecodes::_invokevirtual: 2653 case Bytecodes::_invokespecial: 2654 case Bytecodes::_invokestatic: 2655 case Bytecodes::_invokeinterface: 2656 { 2657 Bytecode_invoke invoke(sd->method(), sd->bci()); 2658 st->print(" "); 2659 if (invoke.name() != NULL) 2660 invoke.name()->print_symbol_on(st); 2661 else 2662 st->print("<UNKNOWN>"); 2663 break; 2664 } 2665 case Bytecodes::_getfield: 2666 case Bytecodes::_putfield: 2667 case Bytecodes::_getstatic: 2668 case Bytecodes::_putstatic: 2669 { 2670 Bytecode_field field(sd->method(), sd->bci()); 2671 st->print(" "); 2672 if (field.name() != NULL) 2673 field.name()->print_symbol_on(st); 2674 else 2675 st->print("<UNKNOWN>"); 2676 } 2677 } 2678 } 2679 st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop()); 2680 } 2681 2682 // Print all scopes 2683 for (;sd != NULL; sd = sd->sender()) { 2684 st->move_to(column); 2685 st->print("; -"); 2686 if (sd->method() == NULL) { 2687 st->print("method is NULL"); 2688 } else { 2689 sd->method()->print_short_name(st); 2690 } 2691 int lineno = sd->method()->line_number_from_bci(sd->bci()); 2692 if (lineno != -1) { 2693 st->print("@%d (line %d)", sd->bci(), lineno); 2694 } else { 2695 st->print("@%d", sd->bci()); 2696 } 2697 st->cr(); 2698 } 2699 } 2700 2701 // Print relocation information 2702 const char* str = reloc_string_for(begin, end); 2703 if (str != NULL) { 2704 if (sd != NULL) st->cr(); 2705 st->move_to(column); 2706 st->print("; {%s}", str); 2707 } 2708 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin()); 2709 if (cont_offset != 0) { 2710 st->move_to(column); 2711 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset)); 2712 } 2713 2714 } 2715 2716 class DirectNativeCallWrapper: public NativeCallWrapper { 2717 private: 2718 NativeCall* _call; 2719 2720 public: 2721 DirectNativeCallWrapper(NativeCall* call) : _call(call) {} 2722 2723 virtual address destination() const { return _call->destination(); } 2724 virtual address instruction_address() const { return _call->instruction_address(); } 2725 virtual address next_instruction_address() const { return _call->next_instruction_address(); } 2726 virtual address return_address() const { return _call->return_address(); } 2727 2728 virtual address get_resolve_call_stub(bool is_optimized) const { 2729 if (is_optimized) { 2730 return SharedRuntime::get_resolve_opt_virtual_call_stub(); 2731 } 2732 return SharedRuntime::get_resolve_virtual_call_stub(); 2733 } 2734 2735 virtual void set_destination_mt_safe(address dest) { 2736 #if INCLUDE_AOT 2737 if (UseAOT) { 2738 CodeBlob* callee = CodeCache::find_blob(dest); 2739 CompiledMethod* cm = callee->as_compiled_method_or_null(); 2740 if (cm != NULL && cm->is_far_code()) { 2741 // Temporary fix, see JDK-8143106 2742 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address()); 2743 csc->set_to_far(methodHandle(cm->method()), dest); 2744 return; 2745 } 2746 } 2747 #endif 2748 _call->set_destination_mt_safe(dest); 2749 } 2750 2751 virtual void set_to_interpreted(const methodHandle& method, CompiledICInfo& info) { 2752 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address()); 2753 #if INCLUDE_AOT 2754 if (info.to_aot()) { 2755 csc->set_to_far(method, info.entry()); 2756 } else 2757 #endif 2758 { 2759 csc->set_to_interpreted(method, info.entry()); 2760 } 2761 } 2762 2763 virtual void verify() const { 2764 // make sure code pattern is actually a call imm32 instruction 2765 _call->verify(); 2766 if (os::is_MP()) { 2767 _call->verify_alignment(); 2768 } 2769 } 2770 2771 virtual void verify_resolve_call(address dest) const { 2772 CodeBlob* db = CodeCache::find_blob_unsafe(dest); 2773 assert(!db->is_adapter_blob(), "must use stub!"); 2774 } 2775 2776 virtual bool is_call_to_interpreted(address dest) const { 2777 CodeBlob* cb = CodeCache::find_blob(_call->instruction_address()); 2778 return cb->contains(dest); 2779 } 2780 2781 virtual bool is_safe_for_patching() const { return false; } 2782 2783 virtual NativeInstruction* get_load_instruction(virtual_call_Relocation* r) const { 2784 return nativeMovConstReg_at(r->cached_value()); 2785 } 2786 2787 virtual void *get_data(NativeInstruction* instruction) const { 2788 return (void*)((NativeMovConstReg*) instruction)->data(); 2789 } 2790 2791 virtual void set_data(NativeInstruction* instruction, intptr_t data) { 2792 ((NativeMovConstReg*) instruction)->set_data(data); 2793 } 2794 }; 2795 2796 NativeCallWrapper* nmethod::call_wrapper_at(address call) const { 2797 return new DirectNativeCallWrapper((NativeCall*) call); 2798 } 2799 2800 NativeCallWrapper* nmethod::call_wrapper_before(address return_pc) const { 2801 return new DirectNativeCallWrapper(nativeCall_before(return_pc)); 2802 } 2803 2804 address nmethod::call_instruction_address(address pc) const { 2805 if (NativeCall::is_call_before(pc)) { 2806 NativeCall *ncall = nativeCall_before(pc); 2807 return ncall->instruction_address(); 2808 } 2809 return NULL; 2810 } 2811 2812 CompiledStaticCall* nmethod::compiledStaticCall_at(Relocation* call_site) const { 2813 return CompiledDirectStaticCall::at(call_site); 2814 } 2815 2816 CompiledStaticCall* nmethod::compiledStaticCall_at(address call_site) const { 2817 return CompiledDirectStaticCall::at(call_site); 2818 } 2819 2820 CompiledStaticCall* nmethod::compiledStaticCall_before(address return_addr) const { 2821 return CompiledDirectStaticCall::before(return_addr); 2822 } 2823 2824 #ifndef PRODUCT 2825 2826 void nmethod::print_value_on(outputStream* st) const { 2827 st->print("nmethod"); 2828 print_on(st, NULL); 2829 } 2830 2831 void nmethod::print_calls(outputStream* st) { 2832 RelocIterator iter(this); 2833 while (iter.next()) { 2834 switch (iter.type()) { 2835 case relocInfo::virtual_call_type: 2836 case relocInfo::opt_virtual_call_type: { 2837 VerifyMutexLocker mc(CompiledIC_lock); 2838 CompiledIC_at(&iter)->print(); 2839 break; 2840 } 2841 case relocInfo::static_call_type: 2842 st->print_cr("Static call at " INTPTR_FORMAT, p2i(iter.reloc()->addr())); 2843 CompiledDirectStaticCall::at(iter.reloc())->print(); 2844 break; 2845 } 2846 } 2847 } 2848 2849 void nmethod::print_handler_table() { 2850 ExceptionHandlerTable(this).print(); 2851 } 2852 2853 void nmethod::print_nul_chk_table() { 2854 ImplicitExceptionTable(this).print(code_begin()); 2855 } 2856 2857 void nmethod::print_statistics() { 2858 ttyLocker ttyl; 2859 if (xtty != NULL) xtty->head("statistics type='nmethod'"); 2860 native_nmethod_stats.print_native_nmethod_stats(); 2861 #ifdef COMPILER1 2862 c1_java_nmethod_stats.print_nmethod_stats("C1"); 2863 #endif 2864 #ifdef COMPILER2 2865 c2_java_nmethod_stats.print_nmethod_stats("C2"); 2866 #endif 2867 #if INCLUDE_JVMCI 2868 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI"); 2869 #endif 2870 #ifdef SHARK 2871 shark_java_nmethod_stats.print_nmethod_stats("Shark"); 2872 #endif 2873 unknown_java_nmethod_stats.print_nmethod_stats("Unknown"); 2874 DebugInformationRecorder::print_statistics(); 2875 #ifndef PRODUCT 2876 pc_nmethod_stats.print_pc_stats(); 2877 #endif 2878 Dependencies::print_statistics(); 2879 if (xtty != NULL) xtty->tail("statistics"); 2880 } 2881 2882 #endif // !PRODUCT 2883 2884 #if INCLUDE_JVMCI 2885 void nmethod::clear_jvmci_installed_code() { 2886 // write_ref_method_pre/post can only be safely called at a 2887 // safepoint or while holding the CodeCache_lock 2888 assert(CodeCache_lock->is_locked() || 2889 SafepointSynchronize::is_at_safepoint(), "should be performed under a lock for consistency"); 2890 if (_jvmci_installed_code != NULL) { 2891 // This must be done carefully to maintain nmethod remembered sets properly 2892 BarrierSet* bs = Universe::heap()->barrier_set(); 2893 bs->write_ref_nmethod_pre(&_jvmci_installed_code, this); 2894 _jvmci_installed_code = NULL; 2895 bs->write_ref_nmethod_post(&_jvmci_installed_code, this); 2896 } 2897 } 2898 2899 void nmethod::maybe_invalidate_installed_code() { 2900 assert(Patching_lock->is_locked() || 2901 SafepointSynchronize::is_at_safepoint(), "should be performed under a lock for consistency"); 2902 oop installed_code = jvmci_installed_code(); 2903 if (installed_code != NULL) { 2904 nmethod* nm = (nmethod*)InstalledCode::address(installed_code); 2905 if (nm == NULL || nm != this) { 2906 // The link has been broken or the InstalledCode instance is 2907 // associated with another nmethod so do nothing. 2908 return; 2909 } 2910 if (!is_alive()) { 2911 // Break the link between nmethod and InstalledCode such that the nmethod 2912 // can subsequently be flushed safely. The link must be maintained while 2913 // the method could have live activations since invalidateInstalledCode 2914 // might want to invalidate all existing activations. 2915 InstalledCode::set_address(installed_code, 0); 2916 InstalledCode::set_entryPoint(installed_code, 0); 2917 } else if (is_not_entrant()) { 2918 // Remove the entry point so any invocation will fail but keep 2919 // the address link around that so that existing activations can 2920 // be invalidated. 2921 InstalledCode::set_entryPoint(installed_code, 0); 2922 } 2923 } 2924 } 2925 2926 void nmethod::invalidate_installed_code(Handle installedCode, TRAPS) { 2927 if (installedCode() == NULL) { 2928 THROW(vmSymbols::java_lang_NullPointerException()); 2929 } 2930 jlong nativeMethod = InstalledCode::address(installedCode); 2931 nmethod* nm = (nmethod*)nativeMethod; 2932 if (nm == NULL) { 2933 // Nothing to do 2934 return; 2935 } 2936 2937 nmethodLocker nml(nm); 2938 #ifdef ASSERT 2939 { 2940 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 2941 // This relationship can only be checked safely under a lock 2942 assert(nm == NULL || !nm->is_alive() || nm->jvmci_installed_code() == installedCode(), "sanity check"); 2943 } 2944 #endif 2945 2946 if (nm->is_alive()) { 2947 // The nmethod state machinery maintains the link between the 2948 // HotSpotInstalledCode and nmethod* so as long as the nmethod appears to be 2949 // alive assume there is work to do and deoptimize the nmethod. 2950 nm->mark_for_deoptimization(); 2951 VM_Deoptimize op; 2952 VMThread::execute(&op); 2953 } 2954 2955 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 2956 // Check that it's still associated with the same nmethod and break 2957 // the link if it is. 2958 if (InstalledCode::address(installedCode) == nativeMethod) { 2959 InstalledCode::set_address(installedCode, 0); 2960 } 2961 } 2962 2963 char* nmethod::jvmci_installed_code_name(char* buf, size_t buflen) { 2964 if (!this->is_compiled_by_jvmci()) { 2965 return NULL; 2966 } 2967 oop installedCode = this->jvmci_installed_code(); 2968 if (installedCode != NULL) { 2969 oop installedCodeName = NULL; 2970 if (installedCode->is_a(InstalledCode::klass())) { 2971 installedCodeName = InstalledCode::name(installedCode); 2972 } 2973 if (installedCodeName != NULL) { 2974 return java_lang_String::as_utf8_string(installedCodeName, buf, (int)buflen); 2975 } else { 2976 jio_snprintf(buf, buflen, "null"); 2977 return buf; 2978 } 2979 } 2980 jio_snprintf(buf, buflen, "noInstalledCode"); 2981 return buf; 2982 } 2983 #endif 2984