1 /* 2 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "jvm.h" 27 #include "code/codeCache.hpp" 28 #include "code/compiledIC.hpp" 29 #include "code/compiledMethod.inline.hpp" 30 #include "code/dependencies.hpp" 31 #include "code/nativeInst.hpp" 32 #include "code/nmethod.hpp" 33 #include "code/scopeDesc.hpp" 34 #include "compiler/abstractCompiler.hpp" 35 #include "compiler/compileBroker.hpp" 36 #include "compiler/compileLog.hpp" 37 #include "compiler/compilerDirectives.hpp" 38 #include "compiler/directivesParser.hpp" 39 #include "compiler/disassembler.hpp" 40 #include "interpreter/bytecode.hpp" 41 #include "logging/log.hpp" 42 #include "logging/logStream.hpp" 43 #include "memory/allocation.inline.hpp" 44 #include "memory/resourceArea.hpp" 45 #include "oops/method.inline.hpp" 46 #include "oops/methodData.hpp" 47 #include "oops/oop.inline.hpp" 48 #include "prims/jvmtiImpl.hpp" 49 #include "runtime/atomic.hpp" 50 #include "runtime/flags/flagSetting.hpp" 51 #include "runtime/frame.inline.hpp" 52 #include "runtime/handles.inline.hpp" 53 #include "runtime/jniHandles.inline.hpp" 54 #include "runtime/orderAccess.hpp" 55 #include "runtime/os.hpp" 56 #include "runtime/safepointVerifiers.hpp" 57 #include "runtime/sharedRuntime.hpp" 58 #include "runtime/sweeper.hpp" 59 #include "runtime/vmThread.hpp" 60 #include "utilities/align.hpp" 61 #include "utilities/dtrace.hpp" 62 #include "utilities/events.hpp" 63 #include "utilities/resourceHash.hpp" 64 #include "utilities/xmlstream.hpp" 65 #if INCLUDE_JVMCI 66 #include "jvmci/jvmciJavaClasses.hpp" 67 #endif 68 69 #ifdef DTRACE_ENABLED 70 71 // Only bother with this argument setup if dtrace is available 72 73 #define DTRACE_METHOD_UNLOAD_PROBE(method) \ 74 { \ 75 Method* m = (method); \ 76 if (m != NULL) { \ 77 Symbol* klass_name = m->klass_name(); \ 78 Symbol* name = m->name(); \ 79 Symbol* signature = m->signature(); \ 80 HOTSPOT_COMPILED_METHOD_UNLOAD( \ 81 (char *) klass_name->bytes(), klass_name->utf8_length(), \ 82 (char *) name->bytes(), name->utf8_length(), \ 83 (char *) signature->bytes(), signature->utf8_length()); \ 84 } \ 85 } 86 87 #else // ndef DTRACE_ENABLED 88 89 #define DTRACE_METHOD_UNLOAD_PROBE(method) 90 91 #endif 92 93 //--------------------------------------------------------------------------------- 94 // NMethod statistics 95 // They are printed under various flags, including: 96 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation. 97 // (In the latter two cases, they like other stats are printed to the log only.) 98 99 #ifndef PRODUCT 100 // These variables are put into one block to reduce relocations 101 // and make it simpler to print from the debugger. 102 struct java_nmethod_stats_struct { 103 int nmethod_count; 104 int total_size; 105 int relocation_size; 106 int consts_size; 107 int insts_size; 108 int stub_size; 109 int scopes_data_size; 110 int scopes_pcs_size; 111 int dependencies_size; 112 int handler_table_size; 113 int nul_chk_table_size; 114 int oops_size; 115 int metadata_size; 116 117 void note_nmethod(nmethod* nm) { 118 nmethod_count += 1; 119 total_size += nm->size(); 120 relocation_size += nm->relocation_size(); 121 consts_size += nm->consts_size(); 122 insts_size += nm->insts_size(); 123 stub_size += nm->stub_size(); 124 oops_size += nm->oops_size(); 125 metadata_size += nm->metadata_size(); 126 scopes_data_size += nm->scopes_data_size(); 127 scopes_pcs_size += nm->scopes_pcs_size(); 128 dependencies_size += nm->dependencies_size(); 129 handler_table_size += nm->handler_table_size(); 130 nul_chk_table_size += nm->nul_chk_table_size(); 131 } 132 void print_nmethod_stats(const char* name) { 133 if (nmethod_count == 0) return; 134 tty->print_cr("Statistics for %d bytecoded nmethods for %s:", nmethod_count, name); 135 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size); 136 if (nmethod_count != 0) tty->print_cr(" header = " SIZE_FORMAT, nmethod_count * sizeof(nmethod)); 137 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size); 138 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size); 139 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size); 140 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size); 141 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size); 142 if (metadata_size != 0) tty->print_cr(" metadata = %d", metadata_size); 143 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size); 144 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size); 145 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size); 146 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size); 147 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size); 148 } 149 }; 150 151 struct native_nmethod_stats_struct { 152 int native_nmethod_count; 153 int native_total_size; 154 int native_relocation_size; 155 int native_insts_size; 156 int native_oops_size; 157 int native_metadata_size; 158 void note_native_nmethod(nmethod* nm) { 159 native_nmethod_count += 1; 160 native_total_size += nm->size(); 161 native_relocation_size += nm->relocation_size(); 162 native_insts_size += nm->insts_size(); 163 native_oops_size += nm->oops_size(); 164 native_metadata_size += nm->metadata_size(); 165 } 166 void print_native_nmethod_stats() { 167 if (native_nmethod_count == 0) return; 168 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count); 169 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size); 170 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size); 171 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size); 172 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size); 173 if (native_metadata_size != 0) tty->print_cr(" N. metadata = %d", native_metadata_size); 174 } 175 }; 176 177 struct pc_nmethod_stats_struct { 178 int pc_desc_resets; // number of resets (= number of caches) 179 int pc_desc_queries; // queries to nmethod::find_pc_desc 180 int pc_desc_approx; // number of those which have approximate true 181 int pc_desc_repeats; // number of _pc_descs[0] hits 182 int pc_desc_hits; // number of LRU cache hits 183 int pc_desc_tests; // total number of PcDesc examinations 184 int pc_desc_searches; // total number of quasi-binary search steps 185 int pc_desc_adds; // number of LUR cache insertions 186 187 void print_pc_stats() { 188 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query", 189 pc_desc_queries, 190 (double)(pc_desc_tests + pc_desc_searches) 191 / pc_desc_queries); 192 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d", 193 pc_desc_resets, 194 pc_desc_queries, pc_desc_approx, 195 pc_desc_repeats, pc_desc_hits, 196 pc_desc_tests, pc_desc_searches, pc_desc_adds); 197 } 198 }; 199 200 #ifdef COMPILER1 201 static java_nmethod_stats_struct c1_java_nmethod_stats; 202 #endif 203 #ifdef COMPILER2 204 static java_nmethod_stats_struct c2_java_nmethod_stats; 205 #endif 206 #if INCLUDE_JVMCI 207 static java_nmethod_stats_struct jvmci_java_nmethod_stats; 208 #endif 209 static java_nmethod_stats_struct unknown_java_nmethod_stats; 210 211 static native_nmethod_stats_struct native_nmethod_stats; 212 static pc_nmethod_stats_struct pc_nmethod_stats; 213 214 static void note_java_nmethod(nmethod* nm) { 215 #ifdef COMPILER1 216 if (nm->is_compiled_by_c1()) { 217 c1_java_nmethod_stats.note_nmethod(nm); 218 } else 219 #endif 220 #ifdef COMPILER2 221 if (nm->is_compiled_by_c2()) { 222 c2_java_nmethod_stats.note_nmethod(nm); 223 } else 224 #endif 225 #if INCLUDE_JVMCI 226 if (nm->is_compiled_by_jvmci()) { 227 jvmci_java_nmethod_stats.note_nmethod(nm); 228 } else 229 #endif 230 { 231 unknown_java_nmethod_stats.note_nmethod(nm); 232 } 233 } 234 #endif // !PRODUCT 235 236 //--------------------------------------------------------------------------------- 237 238 239 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) { 240 assert(pc != NULL, "Must be non null"); 241 assert(exception.not_null(), "Must be non null"); 242 assert(handler != NULL, "Must be non null"); 243 244 _count = 0; 245 _exception_type = exception->klass(); 246 _next = NULL; 247 248 add_address_and_handler(pc,handler); 249 } 250 251 252 address ExceptionCache::match(Handle exception, address pc) { 253 assert(pc != NULL,"Must be non null"); 254 assert(exception.not_null(),"Must be non null"); 255 if (exception->klass() == exception_type()) { 256 return (test_address(pc)); 257 } 258 259 return NULL; 260 } 261 262 263 bool ExceptionCache::match_exception_with_space(Handle exception) { 264 assert(exception.not_null(),"Must be non null"); 265 if (exception->klass() == exception_type() && count() < cache_size) { 266 return true; 267 } 268 return false; 269 } 270 271 272 address ExceptionCache::test_address(address addr) { 273 int limit = count(); 274 for (int i = 0; i < limit; i++) { 275 if (pc_at(i) == addr) { 276 return handler_at(i); 277 } 278 } 279 return NULL; 280 } 281 282 283 bool ExceptionCache::add_address_and_handler(address addr, address handler) { 284 if (test_address(addr) == handler) return true; 285 286 int index = count(); 287 if (index < cache_size) { 288 set_pc_at(index, addr); 289 set_handler_at(index, handler); 290 increment_count(); 291 return true; 292 } 293 return false; 294 } 295 296 //----------------------------------------------------------------------------- 297 298 299 // Helper used by both find_pc_desc methods. 300 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) { 301 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_tests); 302 if (!approximate) 303 return pc->pc_offset() == pc_offset; 304 else 305 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset(); 306 } 307 308 void PcDescCache::reset_to(PcDesc* initial_pc_desc) { 309 if (initial_pc_desc == NULL) { 310 _pc_descs[0] = NULL; // native method; no PcDescs at all 311 return; 312 } 313 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_resets); 314 // reset the cache by filling it with benign (non-null) values 315 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel"); 316 for (int i = 0; i < cache_size; i++) 317 _pc_descs[i] = initial_pc_desc; 318 } 319 320 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) { 321 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_queries); 322 NOT_PRODUCT(if (approximate) ++pc_nmethod_stats.pc_desc_approx); 323 324 // Note: one might think that caching the most recently 325 // read value separately would be a win, but one would be 326 // wrong. When many threads are updating it, the cache 327 // line it's in would bounce between caches, negating 328 // any benefit. 329 330 // In order to prevent race conditions do not load cache elements 331 // repeatedly, but use a local copy: 332 PcDesc* res; 333 334 // Step one: Check the most recently added value. 335 res = _pc_descs[0]; 336 if (res == NULL) return NULL; // native method; no PcDescs at all 337 if (match_desc(res, pc_offset, approximate)) { 338 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_repeats); 339 return res; 340 } 341 342 // Step two: Check the rest of the LRU cache. 343 for (int i = 1; i < cache_size; ++i) { 344 res = _pc_descs[i]; 345 if (res->pc_offset() < 0) break; // optimization: skip empty cache 346 if (match_desc(res, pc_offset, approximate)) { 347 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_hits); 348 return res; 349 } 350 } 351 352 // Report failure. 353 return NULL; 354 } 355 356 void PcDescCache::add_pc_desc(PcDesc* pc_desc) { 357 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_adds); 358 // Update the LRU cache by shifting pc_desc forward. 359 for (int i = 0; i < cache_size; i++) { 360 PcDesc* next = _pc_descs[i]; 361 _pc_descs[i] = pc_desc; 362 pc_desc = next; 363 } 364 } 365 366 // adjust pcs_size so that it is a multiple of both oopSize and 367 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple 368 // of oopSize, then 2*sizeof(PcDesc) is) 369 static int adjust_pcs_size(int pcs_size) { 370 int nsize = align_up(pcs_size, oopSize); 371 if ((nsize % sizeof(PcDesc)) != 0) { 372 nsize = pcs_size + sizeof(PcDesc); 373 } 374 assert((nsize % oopSize) == 0, "correct alignment"); 375 return nsize; 376 } 377 378 379 int nmethod::total_size() const { 380 return 381 consts_size() + 382 insts_size() + 383 stub_size() + 384 scopes_data_size() + 385 scopes_pcs_size() + 386 handler_table_size() + 387 nul_chk_table_size(); 388 } 389 390 address* nmethod::orig_pc_addr(const frame* fr) { 391 return (address*) ((address)fr->unextended_sp() + _orig_pc_offset); 392 } 393 394 const char* nmethod::compile_kind() const { 395 if (is_osr_method()) return "osr"; 396 if (method() != NULL && is_native_method()) return "c2n"; 397 return NULL; 398 } 399 400 // Fill in default values for various flag fields 401 void nmethod::init_defaults() { 402 _state = not_installed; 403 _has_flushed_dependencies = 0; 404 _lock_count = 0; 405 _stack_traversal_mark = 0; 406 _unload_reported = false; // jvmti state 407 _is_far_code = false; // nmethods are located in CodeCache 408 409 #ifdef ASSERT 410 _oops_are_stale = false; 411 #endif 412 413 _oops_do_mark_link = NULL; 414 _jmethod_id = NULL; 415 _osr_link = NULL; 416 _unloading_next = NULL; 417 _scavenge_root_link = NULL; 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 _jvmci_installed_code_triggers_invalidation = false; 426 #endif 427 } 428 429 nmethod* nmethod::new_native_nmethod(const methodHandle& method, 430 int compile_id, 431 CodeBuffer *code_buffer, 432 int vep_offset, 433 int frame_complete, 434 int frame_size, 435 ByteSize basic_lock_owner_sp_offset, 436 ByteSize basic_lock_sp_offset, 437 OopMapSet* oop_maps) { 438 code_buffer->finalize_oop_references(method); 439 // create nmethod 440 nmethod* nm = NULL; 441 { 442 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 443 int native_nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod)); 444 CodeOffsets offsets; 445 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset); 446 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete); 447 nm = new (native_nmethod_size, CompLevel_none) nmethod(method(), compiler_none, native_nmethod_size, 448 compile_id, &offsets, 449 code_buffer, frame_size, 450 basic_lock_owner_sp_offset, 451 basic_lock_sp_offset, oop_maps); 452 NOT_PRODUCT(if (nm != NULL) native_nmethod_stats.note_native_nmethod(nm)); 453 } 454 455 if (nm != NULL) { 456 // verify nmethod 457 debug_only(nm->verify();) // might block 458 459 nm->log_new_nmethod(); 460 nm->make_in_use(); 461 } 462 return nm; 463 } 464 465 nmethod* nmethod::new_nmethod(const methodHandle& method, 466 int compile_id, 467 int entry_bci, 468 CodeOffsets* offsets, 469 int orig_pc_offset, 470 DebugInformationRecorder* debug_info, 471 Dependencies* dependencies, 472 CodeBuffer* code_buffer, int frame_size, 473 OopMapSet* oop_maps, 474 ExceptionHandlerTable* handler_table, 475 ImplicitExceptionTable* nul_chk_table, 476 AbstractCompiler* compiler, 477 int comp_level 478 #if INCLUDE_JVMCI 479 , jweak installed_code, 480 jweak speculationLog 481 #endif 482 ) 483 { 484 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); 485 code_buffer->finalize_oop_references(method); 486 // create nmethod 487 nmethod* nm = NULL; 488 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 489 int nmethod_size = 490 CodeBlob::allocation_size(code_buffer, sizeof(nmethod)) 491 + adjust_pcs_size(debug_info->pcs_size()) 492 + align_up((int)dependencies->size_in_bytes(), oopSize) 493 + align_up(handler_table->size_in_bytes() , oopSize) 494 + align_up(nul_chk_table->size_in_bytes() , oopSize) 495 + align_up(debug_info->data_size() , oopSize); 496 497 nm = new (nmethod_size, comp_level) 498 nmethod(method(), compiler->type(), nmethod_size, compile_id, entry_bci, offsets, 499 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size, 500 oop_maps, 501 handler_table, 502 nul_chk_table, 503 compiler, 504 comp_level 505 #if INCLUDE_JVMCI 506 , installed_code, 507 speculationLog 508 #endif 509 ); 510 511 if (nm != NULL) { 512 // To make dependency checking during class loading fast, record 513 // the nmethod dependencies in the classes it is dependent on. 514 // This allows the dependency checking code to simply walk the 515 // class hierarchy above the loaded class, checking only nmethods 516 // which are dependent on those classes. The slow way is to 517 // check every nmethod for dependencies which makes it linear in 518 // the number of methods compiled. For applications with a lot 519 // classes the slow way is too slow. 520 for (Dependencies::DepStream deps(nm); deps.next(); ) { 521 if (deps.type() == Dependencies::call_site_target_value) { 522 // CallSite dependencies are managed on per-CallSite instance basis. 523 oop call_site = deps.argument_oop(0); 524 MethodHandles::add_dependent_nmethod(call_site, nm); 525 } else { 526 Klass* klass = deps.context_type(); 527 if (klass == NULL) { 528 continue; // ignore things like evol_method 529 } 530 // record this nmethod as dependent on this klass 531 InstanceKlass::cast(klass)->add_dependent_nmethod(nm); 532 } 533 } 534 NOT_PRODUCT(if (nm != NULL) note_java_nmethod(nm)); 535 } 536 } 537 // Do verification and logging outside CodeCache_lock. 538 if (nm != NULL) { 539 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet. 540 DEBUG_ONLY(nm->verify();) 541 nm->log_new_nmethod(); 542 } 543 return nm; 544 } 545 546 // For native wrappers 547 nmethod::nmethod( 548 Method* method, 549 CompilerType type, 550 int nmethod_size, 551 int compile_id, 552 CodeOffsets* offsets, 553 CodeBuffer* code_buffer, 554 int frame_size, 555 ByteSize basic_lock_owner_sp_offset, 556 ByteSize basic_lock_sp_offset, 557 OopMapSet* oop_maps ) 558 : CompiledMethod(method, "native nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false), 559 _native_receiver_sp_offset(basic_lock_owner_sp_offset), 560 _native_basic_lock_sp_offset(basic_lock_sp_offset) 561 { 562 { 563 int scopes_data_offset = 0; 564 int deoptimize_offset = 0; 565 int deoptimize_mh_offset = 0; 566 567 debug_only(NoSafepointVerifier nsv;) 568 assert_locked_or_safepoint(CodeCache_lock); 569 570 init_defaults(); 571 _entry_bci = InvocationEntryBci; 572 // We have no exception handler or deopt handler make the 573 // values something that will never match a pc like the nmethod vtable entry 574 _exception_offset = 0; 575 _orig_pc_offset = 0; 576 577 _consts_offset = data_offset(); 578 _stub_offset = data_offset(); 579 _oops_offset = data_offset(); 580 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize); 581 scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize); 582 _scopes_pcs_offset = scopes_data_offset; 583 _dependencies_offset = _scopes_pcs_offset; 584 _handler_table_offset = _dependencies_offset; 585 _nul_chk_table_offset = _handler_table_offset; 586 _nmethod_end_offset = _nul_chk_table_offset; 587 _compile_id = compile_id; 588 _comp_level = CompLevel_none; 589 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 590 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 591 _osr_entry_point = NULL; 592 _exception_cache = NULL; 593 _pc_desc_container.reset_to(NULL); 594 _hotness_counter = NMethodSweeper::hotness_counter_reset_val(); 595 596 _scopes_data_begin = (address) this + scopes_data_offset; 597 _deopt_handler_begin = (address) this + deoptimize_offset; 598 _deopt_mh_handler_begin = (address) this + deoptimize_mh_offset; 599 600 code_buffer->copy_code_and_locs_to(this); 601 code_buffer->copy_values_to(this); 602 if (ScavengeRootsInCode) { 603 Universe::heap()->register_nmethod(this); 604 } 605 debug_only(Universe::heap()->verify_nmethod(this)); 606 CodeCache::commit(this); 607 } 608 609 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) { 610 ttyLocker ttyl; // keep the following output all in one block 611 // This output goes directly to the tty, not the compiler log. 612 // To enable tools to match it up with the compilation activity, 613 // be sure to tag this tty output with the compile ID. 614 if (xtty != NULL) { 615 xtty->begin_head("print_native_nmethod"); 616 xtty->method(_method); 617 xtty->stamp(); 618 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this); 619 } 620 // print the header part first 621 print(); 622 // then print the requested information 623 if (PrintNativeNMethods) { 624 print_code(); 625 if (oop_maps != NULL) { 626 oop_maps->print(); 627 } 628 } 629 if (PrintRelocations) { 630 print_relocations(); 631 } 632 if (xtty != NULL) { 633 xtty->tail("print_native_nmethod"); 634 } 635 } 636 } 637 638 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () { 639 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level)); 640 } 641 642 nmethod::nmethod( 643 Method* method, 644 CompilerType type, 645 int nmethod_size, 646 int compile_id, 647 int entry_bci, 648 CodeOffsets* offsets, 649 int orig_pc_offset, 650 DebugInformationRecorder* debug_info, 651 Dependencies* dependencies, 652 CodeBuffer *code_buffer, 653 int frame_size, 654 OopMapSet* oop_maps, 655 ExceptionHandlerTable* handler_table, 656 ImplicitExceptionTable* nul_chk_table, 657 AbstractCompiler* compiler, 658 int comp_level 659 #if INCLUDE_JVMCI 660 , jweak installed_code, 661 jweak speculation_log 662 #endif 663 ) 664 : CompiledMethod(method, "nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false), 665 _native_receiver_sp_offset(in_ByteSize(-1)), 666 _native_basic_lock_sp_offset(in_ByteSize(-1)) 667 { 668 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); 669 { 670 debug_only(NoSafepointVerifier nsv;) 671 assert_locked_or_safepoint(CodeCache_lock); 672 673 _deopt_handler_begin = (address) this; 674 _deopt_mh_handler_begin = (address) this; 675 676 init_defaults(); 677 _entry_bci = entry_bci; 678 _compile_id = compile_id; 679 _comp_level = comp_level; 680 _orig_pc_offset = orig_pc_offset; 681 _hotness_counter = NMethodSweeper::hotness_counter_reset_val(); 682 683 // Section offsets 684 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts()); 685 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs()); 686 set_ctable_begin(header_begin() + _consts_offset); 687 688 #if INCLUDE_JVMCI 689 _jvmci_installed_code = installed_code; 690 _speculation_log = speculation_log; 691 oop obj = JNIHandles::resolve(installed_code); 692 if (obj == NULL || (obj->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(obj))) { 693 _jvmci_installed_code_triggers_invalidation = false; 694 } else { 695 _jvmci_installed_code_triggers_invalidation = true; 696 } 697 698 if (compiler->is_jvmci()) { 699 // JVMCI might not produce any stub sections 700 if (offsets->value(CodeOffsets::Exceptions) != -1) { 701 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions); 702 } else { 703 _exception_offset = -1; 704 } 705 if (offsets->value(CodeOffsets::Deopt) != -1) { 706 _deopt_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::Deopt); 707 } else { 708 _deopt_handler_begin = NULL; 709 } 710 if (offsets->value(CodeOffsets::DeoptMH) != -1) { 711 _deopt_mh_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::DeoptMH); 712 } else { 713 _deopt_mh_handler_begin = NULL; 714 } 715 } else { 716 #endif 717 // Exception handler and deopt handler are in the stub section 718 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set"); 719 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set"); 720 721 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions); 722 _deopt_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::Deopt); 723 if (offsets->value(CodeOffsets::DeoptMH) != -1) { 724 _deopt_mh_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::DeoptMH); 725 } else { 726 _deopt_mh_handler_begin = NULL; 727 #if INCLUDE_JVMCI 728 } 729 #endif 730 } 731 if (offsets->value(CodeOffsets::UnwindHandler) != -1) { 732 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler); 733 } else { 734 _unwind_handler_offset = -1; 735 } 736 737 _oops_offset = data_offset(); 738 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize); 739 int scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize); 740 741 _scopes_pcs_offset = scopes_data_offset + align_up(debug_info->data_size (), oopSize); 742 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size()); 743 _handler_table_offset = _dependencies_offset + align_up((int)dependencies->size_in_bytes (), oopSize); 744 _nul_chk_table_offset = _handler_table_offset + align_up(handler_table->size_in_bytes(), oopSize); 745 _nmethod_end_offset = _nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize); 746 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 747 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 748 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry); 749 _exception_cache = NULL; 750 751 _scopes_data_begin = (address) this + scopes_data_offset; 752 753 _pc_desc_container.reset_to(scopes_pcs_begin()); 754 755 code_buffer->copy_code_and_locs_to(this); 756 // Copy contents of ScopeDescRecorder to nmethod 757 code_buffer->copy_values_to(this); 758 debug_info->copy_to(this); 759 dependencies->copy_to(this); 760 if (ScavengeRootsInCode) { 761 Universe::heap()->register_nmethod(this); 762 } 763 debug_only(Universe::heap()->verify_nmethod(this)); 764 765 CodeCache::commit(this); 766 767 // Copy contents of ExceptionHandlerTable to nmethod 768 handler_table->copy_to(this); 769 nul_chk_table->copy_to(this); 770 771 // we use the information of entry points to find out if a method is 772 // static or non static 773 assert(compiler->is_c2() || compiler->is_jvmci() || 774 _method->is_static() == (entry_point() == _verified_entry_point), 775 " entry points must be same for static methods and vice versa"); 776 } 777 } 778 779 // Print a short set of xml attributes to identify this nmethod. The 780 // output should be embedded in some other element. 781 void nmethod::log_identity(xmlStream* log) const { 782 log->print(" compile_id='%d'", compile_id()); 783 const char* nm_kind = compile_kind(); 784 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind); 785 log->print(" compiler='%s'", compiler_name()); 786 if (TieredCompilation) { 787 log->print(" level='%d'", comp_level()); 788 } 789 #if INCLUDE_JVMCI 790 char buffer[O_BUFLEN]; 791 char* jvmci_name = jvmci_installed_code_name(buffer, O_BUFLEN); 792 if (jvmci_name != NULL) { 793 log->print(" jvmci_installed_code_name='"); 794 log->text("%s", jvmci_name); 795 log->print("'"); 796 } 797 #endif 798 } 799 800 801 #define LOG_OFFSET(log, name) \ 802 if (p2i(name##_end()) - p2i(name##_begin())) \ 803 log->print(" " XSTR(name) "_offset='" INTX_FORMAT "'" , \ 804 p2i(name##_begin()) - p2i(this)) 805 806 807 void nmethod::log_new_nmethod() const { 808 if (LogCompilation && xtty != NULL) { 809 ttyLocker ttyl; 810 HandleMark hm; 811 xtty->begin_elem("nmethod"); 812 log_identity(xtty); 813 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size()); 814 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this)); 815 816 LOG_OFFSET(xtty, relocation); 817 LOG_OFFSET(xtty, consts); 818 LOG_OFFSET(xtty, insts); 819 LOG_OFFSET(xtty, stub); 820 LOG_OFFSET(xtty, scopes_data); 821 LOG_OFFSET(xtty, scopes_pcs); 822 LOG_OFFSET(xtty, dependencies); 823 LOG_OFFSET(xtty, handler_table); 824 LOG_OFFSET(xtty, nul_chk_table); 825 LOG_OFFSET(xtty, oops); 826 LOG_OFFSET(xtty, metadata); 827 828 xtty->method(method()); 829 xtty->stamp(); 830 xtty->end_elem(); 831 } 832 } 833 834 #undef LOG_OFFSET 835 836 837 // Print out more verbose output usually for a newly created nmethod. 838 void nmethod::print_on(outputStream* st, const char* msg) const { 839 if (st != NULL) { 840 ttyLocker ttyl; 841 if (WizardMode) { 842 CompileTask::print(st, this, msg, /*short_form:*/ true); 843 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this)); 844 } else { 845 CompileTask::print(st, this, msg, /*short_form:*/ false); 846 } 847 } 848 } 849 850 void nmethod::maybe_print_nmethod(DirectiveSet* directive) { 851 bool printnmethods = directive->PrintAssemblyOption || directive->PrintNMethodsOption; 852 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) { 853 print_nmethod(printnmethods); 854 } 855 } 856 857 void nmethod::print_nmethod(bool printmethod) { 858 ttyLocker ttyl; // keep the following output all in one block 859 if (xtty != NULL) { 860 xtty->begin_head("print_nmethod"); 861 xtty->stamp(); 862 xtty->end_head(); 863 } 864 // print the header part first 865 print(); 866 // then print the requested information 867 if (printmethod) { 868 print_code(); 869 print_pcs(); 870 if (oop_maps()) { 871 oop_maps()->print(); 872 } 873 } 874 if (printmethod || PrintDebugInfo || CompilerOracle::has_option_string(_method, "PrintDebugInfo")) { 875 print_scopes(); 876 } 877 if (printmethod || PrintRelocations || CompilerOracle::has_option_string(_method, "PrintRelocations")) { 878 print_relocations(); 879 } 880 if (printmethod || PrintDependencies || CompilerOracle::has_option_string(_method, "PrintDependencies")) { 881 print_dependencies(); 882 } 883 if (printmethod || PrintExceptionHandlers) { 884 print_handler_table(); 885 print_nul_chk_table(); 886 } 887 if (printmethod) { 888 print_recorded_oops(); 889 print_recorded_metadata(); 890 } 891 if (xtty != NULL) { 892 xtty->tail("print_nmethod"); 893 } 894 } 895 896 897 // Promote one word from an assembly-time handle to a live embedded oop. 898 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) { 899 if (handle == NULL || 900 // As a special case, IC oops are initialized to 1 or -1. 901 handle == (jobject) Universe::non_oop_word()) { 902 (*dest) = (oop) handle; 903 } else { 904 (*dest) = JNIHandles::resolve_non_null(handle); 905 } 906 } 907 908 909 // Have to have the same name because it's called by a template 910 void nmethod::copy_values(GrowableArray<jobject>* array) { 911 int length = array->length(); 912 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough"); 913 oop* dest = oops_begin(); 914 for (int index = 0 ; index < length; index++) { 915 initialize_immediate_oop(&dest[index], array->at(index)); 916 } 917 918 // Now we can fix up all the oops in the code. We need to do this 919 // in the code because the assembler uses jobjects as placeholders. 920 // The code and relocations have already been initialized by the 921 // CodeBlob constructor, so it is valid even at this early point to 922 // iterate over relocations and patch the code. 923 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true); 924 } 925 926 void nmethod::copy_values(GrowableArray<Metadata*>* array) { 927 int length = array->length(); 928 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough"); 929 Metadata** dest = metadata_begin(); 930 for (int index = 0 ; index < length; index++) { 931 dest[index] = array->at(index); 932 } 933 } 934 935 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) { 936 // re-patch all oop-bearing instructions, just in case some oops moved 937 RelocIterator iter(this, begin, end); 938 while (iter.next()) { 939 if (iter.type() == relocInfo::oop_type) { 940 oop_Relocation* reloc = iter.oop_reloc(); 941 if (initialize_immediates && reloc->oop_is_immediate()) { 942 oop* dest = reloc->oop_addr(); 943 initialize_immediate_oop(dest, (jobject) *dest); 944 } 945 // Refresh the oop-related bits of this instruction. 946 reloc->fix_oop_relocation(); 947 } else if (iter.type() == relocInfo::metadata_type) { 948 metadata_Relocation* reloc = iter.metadata_reloc(); 949 reloc->fix_metadata_relocation(); 950 } 951 } 952 } 953 954 955 void nmethod::verify_clean_inline_caches() { 956 assert_locked_or_safepoint(CompiledIC_lock); 957 958 ResourceMark rm; 959 RelocIterator iter(this, oops_reloc_begin()); 960 while(iter.next()) { 961 switch(iter.type()) { 962 case relocInfo::virtual_call_type: 963 case relocInfo::opt_virtual_call_type: { 964 CompiledIC *ic = CompiledIC_at(&iter); 965 // Ok, to lookup references to zombies here 966 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination()); 967 assert(cb != NULL, "destination not in CodeBlob?"); 968 nmethod* nm = cb->as_nmethod_or_null(); 969 if( nm != NULL ) { 970 // Verify that inline caches pointing to both zombie and not_entrant methods are clean 971 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 972 assert(ic->is_clean(), "IC should be clean"); 973 } 974 } 975 break; 976 } 977 case relocInfo::static_call_type: { 978 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc()); 979 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination()); 980 assert(cb != NULL, "destination not in CodeBlob?"); 981 nmethod* nm = cb->as_nmethod_or_null(); 982 if( nm != NULL ) { 983 // Verify that inline caches pointing to both zombie and not_entrant methods are clean 984 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 985 assert(csc->is_clean(), "IC should be clean"); 986 } 987 } 988 break; 989 } 990 default: 991 break; 992 } 993 } 994 } 995 996 // This is a private interface with the sweeper. 997 void nmethod::mark_as_seen_on_stack() { 998 assert(is_alive(), "Must be an alive method"); 999 // Set the traversal mark to ensure that the sweeper does 2 1000 // cleaning passes before moving to zombie. 1001 set_stack_traversal_mark(NMethodSweeper::traversal_count()); 1002 } 1003 1004 // Tell if a non-entrant method can be converted to a zombie (i.e., 1005 // there are no activations on the stack, not in use by the VM, 1006 // and not in use by the ServiceThread) 1007 bool nmethod::can_convert_to_zombie() { 1008 assert(is_not_entrant(), "must be a non-entrant method"); 1009 1010 // Since the nmethod sweeper only does partial sweep the sweeper's traversal 1011 // count can be greater than the stack traversal count before it hits the 1012 // nmethod for the second time. 1013 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count() && 1014 !is_locked_by_vm(); 1015 } 1016 1017 void nmethod::inc_decompile_count() { 1018 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return; 1019 // Could be gated by ProfileTraps, but do not bother... 1020 Method* m = method(); 1021 if (m == NULL) return; 1022 MethodData* mdo = m->method_data(); 1023 if (mdo == NULL) return; 1024 // There is a benign race here. See comments in methodData.hpp. 1025 mdo->inc_decompile_count(); 1026 } 1027 1028 void nmethod::make_unloaded(oop cause) { 1029 1030 post_compiled_method_unload(); 1031 1032 // This nmethod is being unloaded, make sure that dependencies 1033 // recorded in instanceKlasses get flushed. 1034 // Since this work is being done during a GC, defer deleting dependencies from the 1035 // InstanceKlass. 1036 assert(Universe::heap()->is_gc_active(), "should only be called during gc"); 1037 flush_dependencies(/*delete_immediately*/false); 1038 1039 // Break cycle between nmethod & method 1040 LogTarget(Trace, class, unload, nmethod) lt; 1041 if (lt.is_enabled()) { 1042 LogStream ls(lt); 1043 ls.print("making nmethod " INTPTR_FORMAT 1044 " unloadable, Method*(" INTPTR_FORMAT 1045 "), cause(" INTPTR_FORMAT ") ", 1046 p2i(this), p2i(_method), p2i(cause)); 1047 if (cause != NULL) { 1048 cause->print_value_on(&ls); 1049 } 1050 ls.cr(); 1051 } 1052 // Unlink the osr method, so we do not look this up again 1053 if (is_osr_method()) { 1054 // Invalidate the osr nmethod only once 1055 if (is_in_use()) { 1056 invalidate_osr_method(); 1057 } 1058 #ifdef ASSERT 1059 if (method() != NULL) { 1060 // Make sure osr nmethod is invalidated, i.e. not on the list 1061 bool found = method()->method_holder()->remove_osr_nmethod(this); 1062 assert(!found, "osr nmethod should have been invalidated"); 1063 } 1064 #endif 1065 } 1066 1067 // If _method is already NULL the Method* is about to be unloaded, 1068 // so we don't have to break the cycle. Note that it is possible to 1069 // have the Method* live here, in case we unload the nmethod because 1070 // it is pointing to some oop (other than the Method*) being unloaded. 1071 if (_method != NULL) { 1072 // OSR methods point to the Method*, but the Method* does not 1073 // point back! 1074 if (_method->code() == this) { 1075 _method->clear_code(); // Break a cycle 1076 } 1077 _method = NULL; // Clear the method of this dead nmethod 1078 } 1079 1080 // Make the class unloaded - i.e., change state and notify sweeper 1081 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); 1082 if (is_in_use()) { 1083 // Transitioning directly from live to unloaded -- so 1084 // we need to force a cache clean-up; remember this 1085 // for later on. 1086 CodeCache::set_needs_cache_clean(true); 1087 } 1088 1089 // Unregister must be done before the state change 1090 Universe::heap()->unregister_nmethod(this); 1091 1092 _state = unloaded; 1093 1094 // Log the unloading. 1095 log_state_change(cause); 1096 1097 #if INCLUDE_JVMCI 1098 // The method can only be unloaded after the pointer to the installed code 1099 // Java wrapper is no longer alive. Here we need to clear out this weak 1100 // reference to the dead object. 1101 maybe_invalidate_installed_code(); 1102 #endif 1103 1104 // The Method* is gone at this point 1105 assert(_method == NULL, "Tautology"); 1106 1107 set_osr_link(NULL); 1108 NMethodSweeper::report_state_change(this); 1109 } 1110 1111 void nmethod::invalidate_osr_method() { 1112 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); 1113 // Remove from list of active nmethods 1114 if (method() != NULL) { 1115 method()->method_holder()->remove_osr_nmethod(this); 1116 } 1117 } 1118 1119 void nmethod::log_state_change(oop cause) const { 1120 if (LogCompilation) { 1121 if (xtty != NULL) { 1122 ttyLocker ttyl; // keep the following output all in one block 1123 if (_state == unloaded) { 1124 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'", 1125 os::current_thread_id()); 1126 } else { 1127 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s", 1128 os::current_thread_id(), 1129 (_state == zombie ? " zombie='1'" : "")); 1130 } 1131 log_identity(xtty); 1132 if (cause != NULL) { 1133 xtty->print(" cause='%s'", cause->klass()->external_name()); 1134 } 1135 xtty->stamp(); 1136 xtty->end_elem(); 1137 } 1138 } 1139 1140 const char *state_msg = _state == zombie ? "made zombie" : "made not entrant"; 1141 CompileTask::print_ul(this, state_msg); 1142 if (PrintCompilation && _state != unloaded) { 1143 print_on(tty, state_msg); 1144 } 1145 } 1146 1147 /** 1148 * Common functionality for both make_not_entrant and make_zombie 1149 */ 1150 bool nmethod::make_not_entrant_or_zombie(int state) { 1151 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant"); 1152 assert(!is_zombie(), "should not already be a zombie"); 1153 1154 if (_state == state) { 1155 // Avoid taking the lock if already in required state. 1156 // This is safe from races because the state is an end-state, 1157 // which the nmethod cannot back out of once entered. 1158 // No need for fencing either. 1159 return false; 1160 } 1161 1162 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below. 1163 nmethodLocker nml(this); 1164 methodHandle the_method(method()); 1165 // This can be called while the system is already at a safepoint which is ok 1166 NoSafepointVerifier nsv(true, !SafepointSynchronize::is_at_safepoint()); 1167 1168 // during patching, depending on the nmethod state we must notify the GC that 1169 // code has been unloaded, unregistering it. We cannot do this right while 1170 // holding the Patching_lock because we need to use the CodeCache_lock. This 1171 // would be prone to deadlocks. 1172 // This flag is used to remember whether we need to later lock and unregister. 1173 bool nmethod_needs_unregister = false; 1174 1175 { 1176 // invalidate osr nmethod before acquiring the patching lock since 1177 // they both acquire leaf locks and we don't want a deadlock. 1178 // This logic is equivalent to the logic below for patching the 1179 // verified entry point of regular methods. We check that the 1180 // nmethod is in use to ensure that it is invalidated only once. 1181 if (is_osr_method() && is_in_use()) { 1182 // this effectively makes the osr nmethod not entrant 1183 invalidate_osr_method(); 1184 } 1185 1186 // Enter critical section. Does not block for safepoint. 1187 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 1188 1189 if (_state == state) { 1190 // another thread already performed this transition so nothing 1191 // to do, but return false to indicate this. 1192 return false; 1193 } 1194 1195 // The caller can be calling the method statically or through an inline 1196 // cache call. 1197 if (!is_osr_method() && !is_not_entrant()) { 1198 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(), 1199 SharedRuntime::get_handle_wrong_method_stub()); 1200 } 1201 1202 if (is_in_use() && update_recompile_counts()) { 1203 // It's a true state change, so mark the method as decompiled. 1204 // Do it only for transition from alive. 1205 inc_decompile_count(); 1206 } 1207 1208 // If the state is becoming a zombie, signal to unregister the nmethod with 1209 // the heap. 1210 // This nmethod may have already been unloaded during a full GC. 1211 if ((state == zombie) && !is_unloaded()) { 1212 nmethod_needs_unregister = true; 1213 } 1214 1215 // Must happen before state change. Otherwise we have a race condition in 1216 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately 1217 // transition its state from 'not_entrant' to 'zombie' without having to wait 1218 // for stack scanning. 1219 if (state == not_entrant) { 1220 mark_as_seen_on_stack(); 1221 OrderAccess::storestore(); // _stack_traversal_mark and _state 1222 } 1223 1224 // Change state 1225 _state = state; 1226 1227 // Log the transition once 1228 log_state_change(); 1229 1230 // Invalidate while holding the patching lock 1231 JVMCI_ONLY(maybe_invalidate_installed_code()); 1232 1233 // Remove nmethod from method. 1234 // We need to check if both the _code and _from_compiled_code_entry_point 1235 // refer to this nmethod because there is a race in setting these two fields 1236 // in Method* as seen in bugid 4947125. 1237 // If the vep() points to the zombie nmethod, the memory for the nmethod 1238 // could be flushed and the compiler and vtable stubs could still call 1239 // through it. 1240 if (method() != NULL && (method()->code() == this || 1241 method()->from_compiled_entry() == verified_entry_point())) { 1242 HandleMark hm; 1243 method()->clear_code(false /* already owns Patching_lock */); 1244 } 1245 } // leave critical region under Patching_lock 1246 1247 #ifdef ASSERT 1248 if (is_osr_method() && method() != NULL) { 1249 // Make sure osr nmethod is invalidated, i.e. not on the list 1250 bool found = method()->method_holder()->remove_osr_nmethod(this); 1251 assert(!found, "osr nmethod should have been invalidated"); 1252 } 1253 #endif 1254 1255 // When the nmethod becomes zombie it is no longer alive so the 1256 // dependencies must be flushed. nmethods in the not_entrant 1257 // state will be flushed later when the transition to zombie 1258 // happens or they get unloaded. 1259 if (state == zombie) { 1260 { 1261 // Flushing dependencies must be done before any possible 1262 // safepoint can sneak in, otherwise the oops used by the 1263 // dependency logic could have become stale. 1264 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1265 if (nmethod_needs_unregister) { 1266 Universe::heap()->unregister_nmethod(this); 1267 } 1268 flush_dependencies(/*delete_immediately*/true); 1269 } 1270 1271 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload 1272 // event and it hasn't already been reported for this nmethod then 1273 // report it now. The event may have been reported earlier if the GC 1274 // marked it for unloading). JvmtiDeferredEventQueue support means 1275 // we no longer go to a safepoint here. 1276 post_compiled_method_unload(); 1277 1278 #ifdef ASSERT 1279 // It's no longer safe to access the oops section since zombie 1280 // nmethods aren't scanned for GC. 1281 _oops_are_stale = true; 1282 #endif 1283 // the Method may be reclaimed by class unloading now that the 1284 // nmethod is in zombie state 1285 set_method(NULL); 1286 } else { 1287 assert(state == not_entrant, "other cases may need to be handled differently"); 1288 } 1289 1290 if (TraceCreateZombies) { 1291 ResourceMark m; 1292 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"); 1293 } 1294 1295 NMethodSweeper::report_state_change(this); 1296 return true; 1297 } 1298 1299 void nmethod::flush() { 1300 // Note that there are no valid oops in the nmethod anymore. 1301 assert(!is_osr_method() || is_unloaded() || is_zombie(), 1302 "osr nmethod must be unloaded or zombie before flushing"); 1303 assert(is_zombie() || is_osr_method(), "must be a zombie method"); 1304 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed"); 1305 assert_locked_or_safepoint(CodeCache_lock); 1306 1307 // completely deallocate this method 1308 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, p2i(this)); 1309 if (PrintMethodFlushing) { 1310 tty->print_cr("*flushing %s nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT 1311 "/Free CodeCache:" SIZE_FORMAT "Kb", 1312 is_osr_method() ? "osr" : "",_compile_id, p2i(this), CodeCache::blob_count(), 1313 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024); 1314 } 1315 1316 // We need to deallocate any ExceptionCache data. 1317 // Note that we do not need to grab the nmethod lock for this, it 1318 // better be thread safe if we're disposing of it! 1319 ExceptionCache* ec = exception_cache(); 1320 set_exception_cache(NULL); 1321 while(ec != NULL) { 1322 ExceptionCache* next = ec->next(); 1323 delete ec; 1324 ec = next; 1325 } 1326 1327 if (on_scavenge_root_list()) { 1328 CodeCache::drop_scavenge_root_nmethod(this); 1329 } 1330 1331 #if INCLUDE_JVMCI 1332 assert(_jvmci_installed_code == NULL, "should have been nulled out when transitioned to zombie"); 1333 assert(_speculation_log == NULL, "should have been nulled out when transitioned to zombie"); 1334 #endif 1335 1336 CodeBlob::flush(); 1337 CodeCache::free(this); 1338 } 1339 1340 // 1341 // Notify all classes this nmethod is dependent on that it is no 1342 // longer dependent. This should only be called in two situations. 1343 // First, when a nmethod transitions to a zombie all dependents need 1344 // to be clear. Since zombification happens at a safepoint there's no 1345 // synchronization issues. The second place is a little more tricky. 1346 // During phase 1 of mark sweep class unloading may happen and as a 1347 // result some nmethods may get unloaded. In this case the flushing 1348 // of dependencies must happen during phase 1 since after GC any 1349 // dependencies in the unloaded nmethod won't be updated, so 1350 // traversing the dependency information in unsafe. In that case this 1351 // function is called with a boolean argument and this function only 1352 // notifies instanceKlasses that are reachable 1353 1354 void nmethod::flush_dependencies(bool delete_immediately) { 1355 assert_locked_or_safepoint(CodeCache_lock); 1356 assert(Universe::heap()->is_gc_active() != delete_immediately, 1357 "delete_immediately is false if and only if we are called during GC"); 1358 if (!has_flushed_dependencies()) { 1359 set_has_flushed_dependencies(); 1360 for (Dependencies::DepStream deps(this); deps.next(); ) { 1361 if (deps.type() == Dependencies::call_site_target_value) { 1362 // CallSite dependencies are managed on per-CallSite instance basis. 1363 oop call_site = deps.argument_oop(0); 1364 MethodHandles::remove_dependent_nmethod(call_site, this); 1365 } else { 1366 Klass* klass = deps.context_type(); 1367 if (klass == NULL) { 1368 continue; // ignore things like evol_method 1369 } 1370 // During GC delete_immediately is false, and liveness 1371 // of dependee determines class that needs to be updated. 1372 if (delete_immediately || klass->is_loader_alive()) { 1373 // The GC defers deletion of this entry, since there might be multiple threads 1374 // iterating over the _dependencies graph. Other call paths are single-threaded 1375 // and may delete it immediately. 1376 InstanceKlass::cast(klass)->remove_dependent_nmethod(this, delete_immediately); 1377 } 1378 } 1379 } 1380 } 1381 } 1382 1383 1384 // If this oop is not live, the nmethod can be unloaded. 1385 bool nmethod::can_unload(BoolObjectClosure* is_alive, oop* root) { 1386 assert(root != NULL, "just checking"); 1387 oop obj = *root; 1388 if (obj == NULL || is_alive->do_object_b(obj)) { 1389 return false; 1390 } 1391 1392 // An nmethod might be unloaded simply because one of its constant oops has gone dead. 1393 // No actual classes need to be unloaded in order for this to occur. 1394 make_unloaded(obj); 1395 return true; 1396 } 1397 1398 // ------------------------------------------------------------------ 1399 // post_compiled_method_load_event 1400 // new method for install_code() path 1401 // Transfer information from compilation to jvmti 1402 void nmethod::post_compiled_method_load_event() { 1403 1404 Method* moop = method(); 1405 HOTSPOT_COMPILED_METHOD_LOAD( 1406 (char *) moop->klass_name()->bytes(), 1407 moop->klass_name()->utf8_length(), 1408 (char *) moop->name()->bytes(), 1409 moop->name()->utf8_length(), 1410 (char *) moop->signature()->bytes(), 1411 moop->signature()->utf8_length(), 1412 insts_begin(), insts_size()); 1413 1414 if (JvmtiExport::should_post_compiled_method_load() || 1415 JvmtiExport::should_post_compiled_method_unload()) { 1416 get_and_cache_jmethod_id(); 1417 } 1418 1419 if (JvmtiExport::should_post_compiled_method_load()) { 1420 // Let the Service thread (which is a real Java thread) post the event 1421 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); 1422 JvmtiDeferredEventQueue::enqueue( 1423 JvmtiDeferredEvent::compiled_method_load_event(this)); 1424 } 1425 } 1426 1427 jmethodID nmethod::get_and_cache_jmethod_id() { 1428 if (_jmethod_id == NULL) { 1429 // Cache the jmethod_id since it can no longer be looked up once the 1430 // method itself has been marked for unloading. 1431 _jmethod_id = method()->jmethod_id(); 1432 } 1433 return _jmethod_id; 1434 } 1435 1436 void nmethod::post_compiled_method_unload() { 1437 if (unload_reported()) { 1438 // During unloading we transition to unloaded and then to zombie 1439 // and the unloading is reported during the first transition. 1440 return; 1441 } 1442 1443 assert(_method != NULL && !is_unloaded(), "just checking"); 1444 DTRACE_METHOD_UNLOAD_PROBE(method()); 1445 1446 // If a JVMTI agent has enabled the CompiledMethodUnload event then 1447 // post the event. Sometime later this nmethod will be made a zombie 1448 // by the sweeper but the Method* will not be valid at that point. 1449 // If the _jmethod_id is null then no load event was ever requested 1450 // so don't bother posting the unload. The main reason for this is 1451 // that the jmethodID is a weak reference to the Method* so if 1452 // it's being unloaded there's no way to look it up since the weak 1453 // ref will have been cleared. 1454 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) { 1455 assert(!unload_reported(), "already unloaded"); 1456 JvmtiDeferredEvent event = 1457 JvmtiDeferredEvent::compiled_method_unload_event(this, 1458 _jmethod_id, insts_begin()); 1459 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); 1460 JvmtiDeferredEventQueue::enqueue(event); 1461 } 1462 1463 // The JVMTI CompiledMethodUnload event can be enabled or disabled at 1464 // any time. As the nmethod is being unloaded now we mark it has 1465 // having the unload event reported - this will ensure that we don't 1466 // attempt to report the event in the unlikely scenario where the 1467 // event is enabled at the time the nmethod is made a zombie. 1468 set_unload_reported(); 1469 } 1470 1471 bool nmethod::unload_if_dead_at(RelocIterator* iter_at_oop, BoolObjectClosure *is_alive) { 1472 assert(iter_at_oop->type() == relocInfo::oop_type, "Wrong relocation type"); 1473 1474 oop_Relocation* r = iter_at_oop->oop_reloc(); 1475 // Traverse those oops directly embedded in the code. 1476 // Other oops (oop_index>0) are seen as part of scopes_oops. 1477 assert(1 == (r->oop_is_immediate()) + 1478 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 1479 "oop must be found in exactly one place"); 1480 if (r->oop_is_immediate() && r->oop_value() != NULL) { 1481 // Unload this nmethod if the oop is dead. 1482 if (can_unload(is_alive, r->oop_addr())) { 1483 return true;; 1484 } 1485 } 1486 1487 return false; 1488 } 1489 1490 bool nmethod::do_unloading_scopes(BoolObjectClosure* is_alive) { 1491 // Scopes 1492 for (oop* p = oops_begin(); p < oops_end(); p++) { 1493 if (*p == Universe::non_oop_word()) continue; // skip non-oops 1494 if (can_unload(is_alive, p)) { 1495 return true; 1496 } 1497 } 1498 return false; 1499 } 1500 1501 bool nmethod::do_unloading_oops(address low_boundary, BoolObjectClosure* is_alive) { 1502 // Compiled code 1503 1504 // Prevent extra code cache walk for platforms that don't have immediate oops. 1505 if (relocInfo::mustIterateImmediateOopsInCode()) { 1506 RelocIterator iter(this, low_boundary); 1507 while (iter.next()) { 1508 if (iter.type() == relocInfo::oop_type) { 1509 if (unload_if_dead_at(&iter, is_alive)) { 1510 return true; 1511 } 1512 } 1513 } 1514 } 1515 1516 return do_unloading_scopes(is_alive); 1517 } 1518 1519 #if INCLUDE_JVMCI 1520 bool nmethod::do_unloading_jvmci() { 1521 if (_jvmci_installed_code != NULL) { 1522 if (JNIHandles::is_global_weak_cleared(_jvmci_installed_code)) { 1523 if (_jvmci_installed_code_triggers_invalidation) { 1524 // The reference to the installed code has been dropped so invalidate 1525 // this nmethod and allow the sweeper to reclaim it. 1526 make_not_entrant(); 1527 } 1528 clear_jvmci_installed_code(); 1529 } 1530 } 1531 return false; 1532 } 1533 #endif 1534 1535 // Iterate over metadata calling this function. Used by RedefineClasses 1536 void nmethod::metadata_do(void f(Metadata*)) { 1537 { 1538 // Visit all immediate references that are embedded in the instruction stream. 1539 RelocIterator iter(this, oops_reloc_begin()); 1540 while (iter.next()) { 1541 if (iter.type() == relocInfo::metadata_type ) { 1542 metadata_Relocation* r = iter.metadata_reloc(); 1543 // In this metadata, we must only follow those metadatas directly embedded in 1544 // the code. Other metadatas (oop_index>0) are seen as part of 1545 // the metadata section below. 1546 assert(1 == (r->metadata_is_immediate()) + 1547 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()), 1548 "metadata must be found in exactly one place"); 1549 if (r->metadata_is_immediate() && r->metadata_value() != NULL) { 1550 Metadata* md = r->metadata_value(); 1551 if (md != _method) f(md); 1552 } 1553 } else if (iter.type() == relocInfo::virtual_call_type) { 1554 // Check compiledIC holders associated with this nmethod 1555 ResourceMark rm; 1556 CompiledIC *ic = CompiledIC_at(&iter); 1557 if (ic->is_icholder_call()) { 1558 CompiledICHolder* cichk = ic->cached_icholder(); 1559 f(cichk->holder_metadata()); 1560 f(cichk->holder_klass()); 1561 } else { 1562 Metadata* ic_oop = ic->cached_metadata(); 1563 if (ic_oop != NULL) { 1564 f(ic_oop); 1565 } 1566 } 1567 } 1568 } 1569 } 1570 1571 // Visit the metadata section 1572 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) { 1573 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops 1574 Metadata* md = *p; 1575 f(md); 1576 } 1577 1578 // Visit metadata not embedded in the other places. 1579 if (_method != NULL) f(_method); 1580 } 1581 1582 void nmethod::oops_do(OopClosure* f, bool allow_zombie) { 1583 // make sure the oops ready to receive visitors 1584 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod"); 1585 assert(!is_unloaded(), "should not call follow on unloaded nmethod"); 1586 1587 // Prevent extra code cache walk for platforms that don't have immediate oops. 1588 if (relocInfo::mustIterateImmediateOopsInCode()) { 1589 RelocIterator iter(this, oops_reloc_begin()); 1590 1591 while (iter.next()) { 1592 if (iter.type() == relocInfo::oop_type ) { 1593 oop_Relocation* r = iter.oop_reloc(); 1594 // In this loop, we must only follow those oops directly embedded in 1595 // the code. Other oops (oop_index>0) are seen as part of scopes_oops. 1596 assert(1 == (r->oop_is_immediate()) + 1597 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 1598 "oop must be found in exactly one place"); 1599 if (r->oop_is_immediate() && r->oop_value() != NULL) { 1600 f->do_oop(r->oop_addr()); 1601 } 1602 } 1603 } 1604 } 1605 1606 // Scopes 1607 // This includes oop constants not inlined in the code stream. 1608 for (oop* p = oops_begin(); p < oops_end(); p++) { 1609 if (*p == Universe::non_oop_word()) continue; // skip non-oops 1610 f->do_oop(p); 1611 } 1612 } 1613 1614 #define NMETHOD_SENTINEL ((nmethod*)badAddress) 1615 1616 nmethod* volatile nmethod::_oops_do_mark_nmethods; 1617 1618 // An nmethod is "marked" if its _mark_link is set non-null. 1619 // Even if it is the end of the linked list, it will have a non-null link value, 1620 // as long as it is on the list. 1621 // This code must be MP safe, because it is used from parallel GC passes. 1622 bool nmethod::test_set_oops_do_mark() { 1623 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called"); 1624 if (_oops_do_mark_link == NULL) { 1625 // Claim this nmethod for this thread to mark. 1626 if (Atomic::replace_if_null(NMETHOD_SENTINEL, &_oops_do_mark_link)) { 1627 // Atomically append this nmethod (now claimed) to the head of the list: 1628 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods; 1629 for (;;) { 1630 nmethod* required_mark_nmethods = observed_mark_nmethods; 1631 _oops_do_mark_link = required_mark_nmethods; 1632 observed_mark_nmethods = 1633 Atomic::cmpxchg(this, &_oops_do_mark_nmethods, required_mark_nmethods); 1634 if (observed_mark_nmethods == required_mark_nmethods) 1635 break; 1636 } 1637 // Mark was clear when we first saw this guy. 1638 LogTarget(Trace, gc, nmethod) lt; 1639 if (lt.is_enabled()) { 1640 LogStream ls(lt); 1641 CompileTask::print(&ls, this, "oops_do, mark", /*short_form:*/ true); 1642 } 1643 return false; 1644 } 1645 } 1646 // On fall through, another racing thread marked this nmethod before we did. 1647 return true; 1648 } 1649 1650 void nmethod::oops_do_marking_prologue() { 1651 log_trace(gc, nmethod)("oops_do_marking_prologue"); 1652 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row"); 1653 // We use cmpxchg instead of regular assignment here because the user 1654 // may fork a bunch of threads, and we need them all to see the same state. 1655 nmethod* observed = Atomic::cmpxchg(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, (nmethod*)NULL); 1656 guarantee(observed == NULL, "no races in this sequential code"); 1657 } 1658 1659 void nmethod::oops_do_marking_epilogue() { 1660 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row"); 1661 nmethod* cur = _oops_do_mark_nmethods; 1662 while (cur != NMETHOD_SENTINEL) { 1663 assert(cur != NULL, "not NULL-terminated"); 1664 nmethod* next = cur->_oops_do_mark_link; 1665 cur->_oops_do_mark_link = NULL; 1666 DEBUG_ONLY(cur->verify_oop_relocations()); 1667 1668 LogTarget(Trace, gc, nmethod) lt; 1669 if (lt.is_enabled()) { 1670 LogStream ls(lt); 1671 CompileTask::print(&ls, cur, "oops_do, unmark", /*short_form:*/ true); 1672 } 1673 cur = next; 1674 } 1675 nmethod* required = _oops_do_mark_nmethods; 1676 nmethod* observed = Atomic::cmpxchg((nmethod*)NULL, &_oops_do_mark_nmethods, required); 1677 guarantee(observed == required, "no races in this sequential code"); 1678 log_trace(gc, nmethod)("oops_do_marking_epilogue"); 1679 } 1680 1681 class DetectScavengeRoot: public OopClosure { 1682 bool _detected_scavenge_root; 1683 nmethod* _print_nm; 1684 public: 1685 DetectScavengeRoot(nmethod* nm) : _detected_scavenge_root(false), _print_nm(nm) {} 1686 1687 bool detected_scavenge_root() { return _detected_scavenge_root; } 1688 virtual void do_oop(oop* p) { 1689 if ((*p) != NULL && Universe::heap()->is_scavengable(*p)) { 1690 NOT_PRODUCT(maybe_print(p)); 1691 _detected_scavenge_root = true; 1692 } 1693 } 1694 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 1695 1696 #ifndef PRODUCT 1697 void maybe_print(oop* p) { 1698 LogTarget(Trace, gc, nmethod) lt; 1699 if (lt.is_enabled()) { 1700 LogStream ls(lt); 1701 if (!_detected_scavenge_root) { 1702 CompileTask::print(&ls, _print_nm, "new scavenge root", /*short_form:*/ true); 1703 } 1704 ls.print("" PTR_FORMAT "[offset=%d] detected scavengable oop " PTR_FORMAT " (found at " PTR_FORMAT ") ", 1705 p2i(_print_nm), (int)((intptr_t)p - (intptr_t)_print_nm), 1706 p2i(*p), p2i(p)); 1707 ls.cr(); 1708 } 1709 } 1710 #endif //PRODUCT 1711 }; 1712 1713 bool nmethod::detect_scavenge_root_oops() { 1714 DetectScavengeRoot detect_scavenge_root(this); 1715 oops_do(&detect_scavenge_root); 1716 return detect_scavenge_root.detected_scavenge_root(); 1717 } 1718 1719 inline bool includes(void* p, void* from, void* to) { 1720 return from <= p && p < to; 1721 } 1722 1723 1724 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) { 1725 assert(count >= 2, "must be sentinel values, at least"); 1726 1727 #ifdef ASSERT 1728 // must be sorted and unique; we do a binary search in find_pc_desc() 1729 int prev_offset = pcs[0].pc_offset(); 1730 assert(prev_offset == PcDesc::lower_offset_limit, 1731 "must start with a sentinel"); 1732 for (int i = 1; i < count; i++) { 1733 int this_offset = pcs[i].pc_offset(); 1734 assert(this_offset > prev_offset, "offsets must be sorted"); 1735 prev_offset = this_offset; 1736 } 1737 assert(prev_offset == PcDesc::upper_offset_limit, 1738 "must end with a sentinel"); 1739 #endif //ASSERT 1740 1741 // Search for MethodHandle invokes and tag the nmethod. 1742 for (int i = 0; i < count; i++) { 1743 if (pcs[i].is_method_handle_invoke()) { 1744 set_has_method_handle_invokes(true); 1745 break; 1746 } 1747 } 1748 assert(has_method_handle_invokes() == (_deopt_mh_handler_begin != NULL), "must have deopt mh handler"); 1749 1750 int size = count * sizeof(PcDesc); 1751 assert(scopes_pcs_size() >= size, "oob"); 1752 memcpy(scopes_pcs_begin(), pcs, size); 1753 1754 // Adjust the final sentinel downward. 1755 PcDesc* last_pc = &scopes_pcs_begin()[count-1]; 1756 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity"); 1757 last_pc->set_pc_offset(content_size() + 1); 1758 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) { 1759 // Fill any rounding gaps with copies of the last record. 1760 last_pc[1] = last_pc[0]; 1761 } 1762 // The following assert could fail if sizeof(PcDesc) is not 1763 // an integral multiple of oopSize (the rounding term). 1764 // If it fails, change the logic to always allocate a multiple 1765 // of sizeof(PcDesc), and fill unused words with copies of *last_pc. 1766 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly"); 1767 } 1768 1769 void nmethod::copy_scopes_data(u_char* buffer, int size) { 1770 assert(scopes_data_size() >= size, "oob"); 1771 memcpy(scopes_data_begin(), buffer, size); 1772 } 1773 1774 #ifdef ASSERT 1775 static PcDesc* linear_search(const PcDescSearch& search, int pc_offset, bool approximate) { 1776 PcDesc* lower = search.scopes_pcs_begin(); 1777 PcDesc* upper = search.scopes_pcs_end(); 1778 lower += 1; // exclude initial sentinel 1779 PcDesc* res = NULL; 1780 for (PcDesc* p = lower; p < upper; p++) { 1781 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc 1782 if (match_desc(p, pc_offset, approximate)) { 1783 if (res == NULL) 1784 res = p; 1785 else 1786 res = (PcDesc*) badAddress; 1787 } 1788 } 1789 return res; 1790 } 1791 #endif 1792 1793 1794 // Finds a PcDesc with real-pc equal to "pc" 1795 PcDesc* PcDescContainer::find_pc_desc_internal(address pc, bool approximate, const PcDescSearch& search) { 1796 address base_address = search.code_begin(); 1797 if ((pc < base_address) || 1798 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) { 1799 return NULL; // PC is wildly out of range 1800 } 1801 int pc_offset = (int) (pc - base_address); 1802 1803 // Check the PcDesc cache if it contains the desired PcDesc 1804 // (This as an almost 100% hit rate.) 1805 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate); 1806 if (res != NULL) { 1807 assert(res == linear_search(search, pc_offset, approximate), "cache ok"); 1808 return res; 1809 } 1810 1811 // Fallback algorithm: quasi-linear search for the PcDesc 1812 // Find the last pc_offset less than the given offset. 1813 // The successor must be the required match, if there is a match at all. 1814 // (Use a fixed radix to avoid expensive affine pointer arithmetic.) 1815 PcDesc* lower = search.scopes_pcs_begin(); 1816 PcDesc* upper = search.scopes_pcs_end(); 1817 upper -= 1; // exclude final sentinel 1818 if (lower >= upper) return NULL; // native method; no PcDescs at all 1819 1820 #define assert_LU_OK \ 1821 /* invariant on lower..upper during the following search: */ \ 1822 assert(lower->pc_offset() < pc_offset, "sanity"); \ 1823 assert(upper->pc_offset() >= pc_offset, "sanity") 1824 assert_LU_OK; 1825 1826 // Use the last successful return as a split point. 1827 PcDesc* mid = _pc_desc_cache.last_pc_desc(); 1828 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 1829 if (mid->pc_offset() < pc_offset) { 1830 lower = mid; 1831 } else { 1832 upper = mid; 1833 } 1834 1835 // Take giant steps at first (4096, then 256, then 16, then 1) 1836 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1); 1837 const int RADIX = (1 << LOG2_RADIX); 1838 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) { 1839 while ((mid = lower + step) < upper) { 1840 assert_LU_OK; 1841 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 1842 if (mid->pc_offset() < pc_offset) { 1843 lower = mid; 1844 } else { 1845 upper = mid; 1846 break; 1847 } 1848 } 1849 assert_LU_OK; 1850 } 1851 1852 // Sneak up on the value with a linear search of length ~16. 1853 while (true) { 1854 assert_LU_OK; 1855 mid = lower + 1; 1856 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 1857 if (mid->pc_offset() < pc_offset) { 1858 lower = mid; 1859 } else { 1860 upper = mid; 1861 break; 1862 } 1863 } 1864 #undef assert_LU_OK 1865 1866 if (match_desc(upper, pc_offset, approximate)) { 1867 assert(upper == linear_search(search, pc_offset, approximate), "search ok"); 1868 _pc_desc_cache.add_pc_desc(upper); 1869 return upper; 1870 } else { 1871 assert(NULL == linear_search(search, pc_offset, approximate), "search ok"); 1872 return NULL; 1873 } 1874 } 1875 1876 1877 void nmethod::check_all_dependencies(DepChange& changes) { 1878 // Checked dependencies are allocated into this ResourceMark 1879 ResourceMark rm; 1880 1881 // Turn off dependency tracing while actually testing dependencies. 1882 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) ); 1883 1884 typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash, 1885 &DependencySignature::equals, 11027> DepTable; 1886 1887 DepTable* table = new DepTable(); 1888 1889 // Iterate over live nmethods and check dependencies of all nmethods that are not 1890 // marked for deoptimization. A particular dependency is only checked once. 1891 NMethodIterator iter; 1892 while(iter.next()) { 1893 nmethod* nm = iter.method(); 1894 // Only notify for live nmethods 1895 if (nm->is_alive() && !nm->is_marked_for_deoptimization()) { 1896 for (Dependencies::DepStream deps(nm); deps.next(); ) { 1897 // Construct abstraction of a dependency. 1898 DependencySignature* current_sig = new DependencySignature(deps); 1899 1900 // Determine if dependency is already checked. table->put(...) returns 1901 // 'true' if the dependency is added (i.e., was not in the hashtable). 1902 if (table->put(*current_sig, 1)) { 1903 if (deps.check_dependency() != NULL) { 1904 // Dependency checking failed. Print out information about the failed 1905 // dependency and finally fail with an assert. We can fail here, since 1906 // dependency checking is never done in a product build. 1907 tty->print_cr("Failed dependency:"); 1908 changes.print(); 1909 nm->print(); 1910 nm->print_dependencies(); 1911 assert(false, "Should have been marked for deoptimization"); 1912 } 1913 } 1914 } 1915 } 1916 } 1917 } 1918 1919 bool nmethod::check_dependency_on(DepChange& changes) { 1920 // What has happened: 1921 // 1) a new class dependee has been added 1922 // 2) dependee and all its super classes have been marked 1923 bool found_check = false; // set true if we are upset 1924 for (Dependencies::DepStream deps(this); deps.next(); ) { 1925 // Evaluate only relevant dependencies. 1926 if (deps.spot_check_dependency_at(changes) != NULL) { 1927 found_check = true; 1928 NOT_DEBUG(break); 1929 } 1930 } 1931 return found_check; 1932 } 1933 1934 bool nmethod::is_evol_dependent_on(Klass* dependee) { 1935 InstanceKlass *dependee_ik = InstanceKlass::cast(dependee); 1936 Array<Method*>* dependee_methods = dependee_ik->methods(); 1937 for (Dependencies::DepStream deps(this); deps.next(); ) { 1938 if (deps.type() == Dependencies::evol_method) { 1939 Method* method = deps.method_argument(0); 1940 for (int j = 0; j < dependee_methods->length(); j++) { 1941 if (dependee_methods->at(j) == method) { 1942 if (log_is_enabled(Debug, redefine, class, nmethod)) { 1943 ResourceMark rm; 1944 log_debug(redefine, class, nmethod) 1945 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)", 1946 _method->method_holder()->external_name(), 1947 _method->name()->as_C_string(), 1948 _method->signature()->as_C_string(), 1949 compile_id(), 1950 method->method_holder()->external_name(), 1951 method->name()->as_C_string(), 1952 method->signature()->as_C_string()); 1953 } 1954 if (TraceDependencies || LogCompilation) 1955 deps.log_dependency(dependee); 1956 return true; 1957 } 1958 } 1959 } 1960 } 1961 return false; 1962 } 1963 1964 // Called from mark_for_deoptimization, when dependee is invalidated. 1965 bool nmethod::is_dependent_on_method(Method* dependee) { 1966 for (Dependencies::DepStream deps(this); deps.next(); ) { 1967 if (deps.type() != Dependencies::evol_method) 1968 continue; 1969 Method* method = deps.method_argument(0); 1970 if (method == dependee) return true; 1971 } 1972 return false; 1973 } 1974 1975 1976 bool nmethod::is_patchable_at(address instr_addr) { 1977 assert(insts_contains(instr_addr), "wrong nmethod used"); 1978 if (is_zombie()) { 1979 // a zombie may never be patched 1980 return false; 1981 } 1982 return true; 1983 } 1984 1985 1986 address nmethod::continuation_for_implicit_exception(address pc) { 1987 // Exception happened outside inline-cache check code => we are inside 1988 // an active nmethod => use cpc to determine a return address 1989 int exception_offset = pc - code_begin(); 1990 int cont_offset = ImplicitExceptionTable(this).at( exception_offset ); 1991 #ifdef ASSERT 1992 if (cont_offset == 0) { 1993 Thread* thread = Thread::current(); 1994 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY 1995 HandleMark hm(thread); 1996 ResourceMark rm(thread); 1997 CodeBlob* cb = CodeCache::find_blob(pc); 1998 assert(cb != NULL && cb == this, ""); 1999 ttyLocker ttyl; 2000 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, p2i(pc)); 2001 print(); 2002 method()->print_codes(); 2003 print_code(); 2004 print_pcs(); 2005 } 2006 #endif 2007 if (cont_offset == 0) { 2008 // Let the normal error handling report the exception 2009 return NULL; 2010 } 2011 return code_begin() + cont_offset; 2012 } 2013 2014 2015 2016 void nmethod_init() { 2017 // make sure you didn't forget to adjust the filler fields 2018 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word"); 2019 } 2020 2021 2022 //------------------------------------------------------------------------------------------- 2023 2024 2025 // QQQ might we make this work from a frame?? 2026 nmethodLocker::nmethodLocker(address pc) { 2027 CodeBlob* cb = CodeCache::find_blob(pc); 2028 guarantee(cb != NULL && cb->is_compiled(), "bad pc for a nmethod found"); 2029 _nm = cb->as_compiled_method(); 2030 lock_nmethod(_nm); 2031 } 2032 2033 // Only JvmtiDeferredEvent::compiled_method_unload_event() 2034 // should pass zombie_ok == true. 2035 void nmethodLocker::lock_nmethod(CompiledMethod* cm, bool zombie_ok) { 2036 if (cm == NULL) return; 2037 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method 2038 nmethod* nm = cm->as_nmethod(); 2039 Atomic::inc(&nm->_lock_count); 2040 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method"); 2041 } 2042 2043 void nmethodLocker::unlock_nmethod(CompiledMethod* cm) { 2044 if (cm == NULL) return; 2045 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method 2046 nmethod* nm = cm->as_nmethod(); 2047 Atomic::dec(&nm->_lock_count); 2048 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock"); 2049 } 2050 2051 2052 // ----------------------------------------------------------------------------- 2053 // Verification 2054 2055 class VerifyOopsClosure: public OopClosure { 2056 nmethod* _nm; 2057 bool _ok; 2058 public: 2059 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { } 2060 bool ok() { return _ok; } 2061 virtual void do_oop(oop* p) { 2062 if (oopDesc::is_oop_or_null(*p)) return; 2063 if (_ok) { 2064 _nm->print_nmethod(true); 2065 _ok = false; 2066 } 2067 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)", 2068 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm)); 2069 } 2070 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2071 }; 2072 2073 void nmethod::verify() { 2074 2075 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant 2076 // seems odd. 2077 2078 if (is_zombie() || is_not_entrant() || is_unloaded()) 2079 return; 2080 2081 // Make sure all the entry points are correctly aligned for patching. 2082 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point()); 2083 2084 // assert(oopDesc::is_oop(method()), "must be valid"); 2085 2086 ResourceMark rm; 2087 2088 if (!CodeCache::contains(this)) { 2089 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this)); 2090 } 2091 2092 if(is_native_method() ) 2093 return; 2094 2095 nmethod* nm = CodeCache::find_nmethod(verified_entry_point()); 2096 if (nm != this) { 2097 fatal("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this)); 2098 } 2099 2100 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2101 if (! p->verify(this)) { 2102 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this)); 2103 } 2104 } 2105 2106 VerifyOopsClosure voc(this); 2107 oops_do(&voc); 2108 assert(voc.ok(), "embedded oops must be OK"); 2109 Universe::heap()->verify_nmethod(this); 2110 2111 verify_scopes(); 2112 } 2113 2114 2115 void nmethod::verify_interrupt_point(address call_site) { 2116 // Verify IC only when nmethod installation is finished. 2117 if (!is_not_installed()) { 2118 Thread *cur = Thread::current(); 2119 if (CompiledIC_lock->owner() == cur || 2120 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) && 2121 SafepointSynchronize::is_at_safepoint())) { 2122 CompiledIC_at(this, call_site); 2123 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); 2124 } else { 2125 MutexLocker ml_verify (CompiledIC_lock); 2126 CompiledIC_at(this, call_site); 2127 } 2128 } 2129 2130 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address()); 2131 assert(pd != NULL, "PcDesc must exist"); 2132 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(), 2133 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(), 2134 pd->return_oop()); 2135 !sd->is_top(); sd = sd->sender()) { 2136 sd->verify(); 2137 } 2138 } 2139 2140 void nmethod::verify_scopes() { 2141 if( !method() ) return; // Runtime stubs have no scope 2142 if (method()->is_native()) return; // Ignore stub methods. 2143 // iterate through all interrupt point 2144 // and verify the debug information is valid. 2145 RelocIterator iter((nmethod*)this); 2146 while (iter.next()) { 2147 address stub = NULL; 2148 switch (iter.type()) { 2149 case relocInfo::virtual_call_type: 2150 verify_interrupt_point(iter.addr()); 2151 break; 2152 case relocInfo::opt_virtual_call_type: 2153 stub = iter.opt_virtual_call_reloc()->static_stub(false); 2154 verify_interrupt_point(iter.addr()); 2155 break; 2156 case relocInfo::static_call_type: 2157 stub = iter.static_call_reloc()->static_stub(false); 2158 //verify_interrupt_point(iter.addr()); 2159 break; 2160 case relocInfo::runtime_call_type: 2161 case relocInfo::runtime_call_w_cp_type: { 2162 address destination = iter.reloc()->value(); 2163 // Right now there is no way to find out which entries support 2164 // an interrupt point. It would be nice if we had this 2165 // information in a table. 2166 break; 2167 } 2168 default: 2169 break; 2170 } 2171 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section"); 2172 } 2173 } 2174 2175 2176 // ----------------------------------------------------------------------------- 2177 // Non-product code 2178 #ifndef PRODUCT 2179 2180 class DebugScavengeRoot: public OopClosure { 2181 nmethod* _nm; 2182 bool _ok; 2183 public: 2184 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { } 2185 bool ok() { return _ok; } 2186 virtual void do_oop(oop* p) { 2187 if ((*p) == NULL || !Universe::heap()->is_scavengable(*p)) return; 2188 if (_ok) { 2189 _nm->print_nmethod(true); 2190 _ok = false; 2191 } 2192 tty->print_cr("*** scavengable oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)", 2193 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm)); 2194 (*p)->print(); 2195 } 2196 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2197 }; 2198 2199 void nmethod::verify_scavenge_root_oops() { 2200 if (!on_scavenge_root_list()) { 2201 // Actually look inside, to verify the claim that it's clean. 2202 DebugScavengeRoot debug_scavenge_root(this); 2203 oops_do(&debug_scavenge_root); 2204 if (!debug_scavenge_root.ok()) 2205 fatal("found an unadvertised bad scavengable oop in the code cache"); 2206 } 2207 assert(scavenge_root_not_marked(), ""); 2208 } 2209 2210 #endif // PRODUCT 2211 2212 // Printing operations 2213 2214 void nmethod::print() const { 2215 ResourceMark rm; 2216 ttyLocker ttyl; // keep the following output all in one block 2217 2218 tty->print("Compiled method "); 2219 2220 if (is_compiled_by_c1()) { 2221 tty->print("(c1) "); 2222 } else if (is_compiled_by_c2()) { 2223 tty->print("(c2) "); 2224 } else if (is_compiled_by_jvmci()) { 2225 tty->print("(JVMCI) "); 2226 } else { 2227 tty->print("(nm) "); 2228 } 2229 2230 print_on(tty, NULL); 2231 2232 if (WizardMode) { 2233 tty->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this)); 2234 tty->print(" for method " INTPTR_FORMAT , p2i(method())); 2235 tty->print(" { "); 2236 tty->print_cr("%s ", state()); 2237 if (on_scavenge_root_list()) tty->print("scavenge_root "); 2238 tty->print_cr("}:"); 2239 } 2240 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2241 p2i(this), 2242 p2i(this) + size(), 2243 size()); 2244 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2245 p2i(relocation_begin()), 2246 p2i(relocation_end()), 2247 relocation_size()); 2248 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2249 p2i(consts_begin()), 2250 p2i(consts_end()), 2251 consts_size()); 2252 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2253 p2i(insts_begin()), 2254 p2i(insts_end()), 2255 insts_size()); 2256 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2257 p2i(stub_begin()), 2258 p2i(stub_end()), 2259 stub_size()); 2260 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2261 p2i(oops_begin()), 2262 p2i(oops_end()), 2263 oops_size()); 2264 if (metadata_size () > 0) tty->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2265 p2i(metadata_begin()), 2266 p2i(metadata_end()), 2267 metadata_size()); 2268 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2269 p2i(scopes_data_begin()), 2270 p2i(scopes_data_end()), 2271 scopes_data_size()); 2272 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2273 p2i(scopes_pcs_begin()), 2274 p2i(scopes_pcs_end()), 2275 scopes_pcs_size()); 2276 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2277 p2i(dependencies_begin()), 2278 p2i(dependencies_end()), 2279 dependencies_size()); 2280 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2281 p2i(handler_table_begin()), 2282 p2i(handler_table_end()), 2283 handler_table_size()); 2284 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2285 p2i(nul_chk_table_begin()), 2286 p2i(nul_chk_table_end()), 2287 nul_chk_table_size()); 2288 } 2289 2290 #ifndef PRODUCT 2291 2292 void nmethod::print_scopes() { 2293 // Find the first pc desc for all scopes in the code and print it. 2294 ResourceMark rm; 2295 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2296 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null) 2297 continue; 2298 2299 ScopeDesc* sd = scope_desc_at(p->real_pc(this)); 2300 while (sd != NULL) { 2301 sd->print_on(tty, p); 2302 sd = sd->sender(); 2303 } 2304 } 2305 } 2306 2307 void nmethod::print_dependencies() { 2308 ResourceMark rm; 2309 ttyLocker ttyl; // keep the following output all in one block 2310 tty->print_cr("Dependencies:"); 2311 for (Dependencies::DepStream deps(this); deps.next(); ) { 2312 deps.print_dependency(); 2313 Klass* ctxk = deps.context_type(); 2314 if (ctxk != NULL) { 2315 if (ctxk->is_instance_klass() && InstanceKlass::cast(ctxk)->is_dependent_nmethod(this)) { 2316 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name()); 2317 } 2318 } 2319 deps.log_dependency(); // put it into the xml log also 2320 } 2321 } 2322 2323 2324 void nmethod::print_relocations() { 2325 ResourceMark m; // in case methods get printed via the debugger 2326 tty->print_cr("relocations:"); 2327 RelocIterator iter(this); 2328 iter.print(); 2329 } 2330 2331 2332 void nmethod::print_pcs() { 2333 ResourceMark m; // in case methods get printed via debugger 2334 tty->print_cr("pc-bytecode offsets:"); 2335 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2336 p->print(this); 2337 } 2338 } 2339 2340 void nmethod::print_recorded_oops() { 2341 tty->print_cr("Recorded oops:"); 2342 for (int i = 0; i < oops_count(); i++) { 2343 oop o = oop_at(i); 2344 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(o)); 2345 if (o == Universe::non_oop_word()) { 2346 tty->print("non-oop word"); 2347 } else { 2348 if (o != NULL) { 2349 o->print_value(); 2350 } else { 2351 tty->print_cr("NULL"); 2352 } 2353 } 2354 tty->cr(); 2355 } 2356 } 2357 2358 void nmethod::print_recorded_metadata() { 2359 tty->print_cr("Recorded metadata:"); 2360 for (int i = 0; i < metadata_count(); i++) { 2361 Metadata* m = metadata_at(i); 2362 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(m)); 2363 if (m == (Metadata*)Universe::non_oop_word()) { 2364 tty->print("non-metadata word"); 2365 } else { 2366 Metadata::print_value_on_maybe_null(tty, m); 2367 } 2368 tty->cr(); 2369 } 2370 } 2371 2372 #endif // PRODUCT 2373 2374 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) { 2375 RelocIterator iter(this, begin, end); 2376 bool have_one = false; 2377 while (iter.next()) { 2378 have_one = true; 2379 switch (iter.type()) { 2380 case relocInfo::none: return "no_reloc"; 2381 case relocInfo::oop_type: { 2382 stringStream st; 2383 oop_Relocation* r = iter.oop_reloc(); 2384 oop obj = r->oop_value(); 2385 st.print("oop("); 2386 if (obj == NULL) st.print("NULL"); 2387 else obj->print_value_on(&st); 2388 st.print(")"); 2389 return st.as_string(); 2390 } 2391 case relocInfo::metadata_type: { 2392 stringStream st; 2393 metadata_Relocation* r = iter.metadata_reloc(); 2394 Metadata* obj = r->metadata_value(); 2395 st.print("metadata("); 2396 if (obj == NULL) st.print("NULL"); 2397 else obj->print_value_on(&st); 2398 st.print(")"); 2399 return st.as_string(); 2400 } 2401 case relocInfo::runtime_call_type: 2402 case relocInfo::runtime_call_w_cp_type: { 2403 stringStream st; 2404 st.print("runtime_call"); 2405 CallRelocation* r = (CallRelocation*)iter.reloc(); 2406 address dest = r->destination(); 2407 CodeBlob* cb = CodeCache::find_blob(dest); 2408 if (cb != NULL) { 2409 st.print(" %s", cb->name()); 2410 } else { 2411 ResourceMark rm; 2412 const int buflen = 1024; 2413 char* buf = NEW_RESOURCE_ARRAY(char, buflen); 2414 int offset; 2415 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) { 2416 st.print(" %s", buf); 2417 if (offset != 0) { 2418 st.print("+%d", offset); 2419 } 2420 } 2421 } 2422 return st.as_string(); 2423 } 2424 case relocInfo::virtual_call_type: { 2425 stringStream st; 2426 st.print_raw("virtual_call"); 2427 virtual_call_Relocation* r = iter.virtual_call_reloc(); 2428 Method* m = r->method_value(); 2429 if (m != NULL) { 2430 assert(m->is_method(), ""); 2431 m->print_short_name(&st); 2432 } 2433 return st.as_string(); 2434 } 2435 case relocInfo::opt_virtual_call_type: { 2436 stringStream st; 2437 st.print_raw("optimized virtual_call"); 2438 opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc(); 2439 Method* m = r->method_value(); 2440 if (m != NULL) { 2441 assert(m->is_method(), ""); 2442 m->print_short_name(&st); 2443 } 2444 return st.as_string(); 2445 } 2446 case relocInfo::static_call_type: { 2447 stringStream st; 2448 st.print_raw("static_call"); 2449 static_call_Relocation* r = iter.static_call_reloc(); 2450 Method* m = r->method_value(); 2451 if (m != NULL) { 2452 assert(m->is_method(), ""); 2453 m->print_short_name(&st); 2454 } 2455 return st.as_string(); 2456 } 2457 case relocInfo::static_stub_type: return "static_stub"; 2458 case relocInfo::external_word_type: return "external_word"; 2459 case relocInfo::internal_word_type: return "internal_word"; 2460 case relocInfo::section_word_type: return "section_word"; 2461 case relocInfo::poll_type: return "poll"; 2462 case relocInfo::poll_return_type: return "poll_return"; 2463 case relocInfo::type_mask: return "type_bit_mask"; 2464 2465 default: 2466 break; 2467 } 2468 } 2469 return have_one ? "other" : NULL; 2470 } 2471 2472 // Return a the last scope in (begin..end] 2473 ScopeDesc* nmethod::scope_desc_in(address begin, address end) { 2474 PcDesc* p = pc_desc_near(begin+1); 2475 if (p != NULL && p->real_pc(this) <= end) { 2476 return new ScopeDesc(this, p->scope_decode_offset(), 2477 p->obj_decode_offset(), p->should_reexecute(), p->rethrow_exception(), 2478 p->return_oop()); 2479 } 2480 return NULL; 2481 } 2482 2483 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const { 2484 if (block_begin == entry_point()) stream->print_cr("[Entry Point]"); 2485 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]"); 2486 if (JVMCI_ONLY(_exception_offset >= 0 &&) block_begin == exception_begin()) stream->print_cr("[Exception Handler]"); 2487 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]"); 2488 if (JVMCI_ONLY(_deopt_handler_begin != NULL &&) block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]"); 2489 2490 if (has_method_handle_invokes()) 2491 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]"); 2492 2493 if (block_begin == consts_begin()) stream->print_cr("[Constants]"); 2494 2495 if (block_begin == entry_point()) { 2496 methodHandle m = method(); 2497 if (m.not_null()) { 2498 stream->print(" # "); 2499 m->print_value_on(stream); 2500 stream->cr(); 2501 } 2502 if (m.not_null() && !is_osr_method()) { 2503 ResourceMark rm; 2504 int sizeargs = m->size_of_parameters(); 2505 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs); 2506 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs); 2507 { 2508 int sig_index = 0; 2509 if (!m->is_static()) 2510 sig_bt[sig_index++] = T_OBJECT; // 'this' 2511 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) { 2512 BasicType t = ss.type(); 2513 sig_bt[sig_index++] = t; 2514 if (type2size[t] == 2) { 2515 sig_bt[sig_index++] = T_VOID; 2516 } else { 2517 assert(type2size[t] == 1, "size is 1 or 2"); 2518 } 2519 } 2520 assert(sig_index == sizeargs, ""); 2521 } 2522 const char* spname = "sp"; // make arch-specific? 2523 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false); 2524 int stack_slot_offset = this->frame_size() * wordSize; 2525 int tab1 = 14, tab2 = 24; 2526 int sig_index = 0; 2527 int arg_index = (m->is_static() ? 0 : -1); 2528 bool did_old_sp = false; 2529 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) { 2530 bool at_this = (arg_index == -1); 2531 bool at_old_sp = false; 2532 BasicType t = (at_this ? T_OBJECT : ss.type()); 2533 assert(t == sig_bt[sig_index], "sigs in sync"); 2534 if (at_this) 2535 stream->print(" # this: "); 2536 else 2537 stream->print(" # parm%d: ", arg_index); 2538 stream->move_to(tab1); 2539 VMReg fst = regs[sig_index].first(); 2540 VMReg snd = regs[sig_index].second(); 2541 if (fst->is_reg()) { 2542 stream->print("%s", fst->name()); 2543 if (snd->is_valid()) { 2544 stream->print(":%s", snd->name()); 2545 } 2546 } else if (fst->is_stack()) { 2547 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset; 2548 if (offset == stack_slot_offset) at_old_sp = true; 2549 stream->print("[%s+0x%x]", spname, offset); 2550 } else { 2551 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd); 2552 } 2553 stream->print(" "); 2554 stream->move_to(tab2); 2555 stream->print("= "); 2556 if (at_this) { 2557 m->method_holder()->print_value_on(stream); 2558 } else { 2559 bool did_name = false; 2560 if (!at_this && ss.is_object()) { 2561 Symbol* name = ss.as_symbol_or_null(); 2562 if (name != NULL) { 2563 name->print_value_on(stream); 2564 did_name = true; 2565 } 2566 } 2567 if (!did_name) 2568 stream->print("%s", type2name(t)); 2569 } 2570 if (at_old_sp) { 2571 stream->print(" (%s of caller)", spname); 2572 did_old_sp = true; 2573 } 2574 stream->cr(); 2575 sig_index += type2size[t]; 2576 arg_index += 1; 2577 if (!at_this) ss.next(); 2578 } 2579 if (!did_old_sp) { 2580 stream->print(" # "); 2581 stream->move_to(tab1); 2582 stream->print("[%s+0x%x]", spname, stack_slot_offset); 2583 stream->print(" (%s of caller)", spname); 2584 stream->cr(); 2585 } 2586 } 2587 } 2588 } 2589 2590 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) { 2591 // First, find an oopmap in (begin, end]. 2592 // We use the odd half-closed interval so that oop maps and scope descs 2593 // which are tied to the byte after a call are printed with the call itself. 2594 address base = code_begin(); 2595 ImmutableOopMapSet* oms = oop_maps(); 2596 if (oms != NULL) { 2597 for (int i = 0, imax = oms->count(); i < imax; i++) { 2598 const ImmutableOopMapPair* pair = oms->pair_at(i); 2599 const ImmutableOopMap* om = pair->get_from(oms); 2600 address pc = base + pair->pc_offset(); 2601 if (pc > begin) { 2602 if (pc <= end) { 2603 st->move_to(column); 2604 st->print("; "); 2605 om->print_on(st); 2606 } 2607 break; 2608 } 2609 } 2610 } 2611 2612 // Print any debug info present at this pc. 2613 ScopeDesc* sd = scope_desc_in(begin, end); 2614 if (sd != NULL) { 2615 st->move_to(column); 2616 if (sd->bci() == SynchronizationEntryBCI) { 2617 st->print(";*synchronization entry"); 2618 } else if (sd->bci() == AfterBci) { 2619 st->print(";* method exit (unlocked if synchronized)"); 2620 } else if (sd->bci() == UnwindBci) { 2621 st->print(";* unwind (locked if synchronized)"); 2622 } else if (sd->bci() == AfterExceptionBci) { 2623 st->print(";* unwind (unlocked if synchronized)"); 2624 } else if (sd->bci() == UnknownBci) { 2625 st->print(";* unknown"); 2626 } else if (sd->bci() == InvalidFrameStateBci) { 2627 st->print(";* invalid frame state"); 2628 } else { 2629 if (sd->method() == NULL) { 2630 st->print("method is NULL"); 2631 } else if (sd->method()->is_native()) { 2632 st->print("method is native"); 2633 } else { 2634 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci()); 2635 st->print(";*%s", Bytecodes::name(bc)); 2636 switch (bc) { 2637 case Bytecodes::_invokevirtual: 2638 case Bytecodes::_invokespecial: 2639 case Bytecodes::_invokestatic: 2640 case Bytecodes::_invokeinterface: 2641 { 2642 Bytecode_invoke invoke(sd->method(), sd->bci()); 2643 st->print(" "); 2644 if (invoke.name() != NULL) 2645 invoke.name()->print_symbol_on(st); 2646 else 2647 st->print("<UNKNOWN>"); 2648 break; 2649 } 2650 case Bytecodes::_getfield: 2651 case Bytecodes::_putfield: 2652 case Bytecodes::_getstatic: 2653 case Bytecodes::_putstatic: 2654 { 2655 Bytecode_field field(sd->method(), sd->bci()); 2656 st->print(" "); 2657 if (field.name() != NULL) 2658 field.name()->print_symbol_on(st); 2659 else 2660 st->print("<UNKNOWN>"); 2661 } 2662 default: 2663 break; 2664 } 2665 } 2666 st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop()); 2667 } 2668 2669 // Print all scopes 2670 for (;sd != NULL; sd = sd->sender()) { 2671 st->move_to(column); 2672 st->print("; -"); 2673 if (sd->method() == NULL) { 2674 st->print("method is NULL"); 2675 } else { 2676 sd->method()->print_short_name(st); 2677 } 2678 int lineno = sd->method()->line_number_from_bci(sd->bci()); 2679 if (lineno != -1) { 2680 st->print("@%d (line %d)", sd->bci(), lineno); 2681 } else { 2682 st->print("@%d", sd->bci()); 2683 } 2684 st->cr(); 2685 } 2686 } 2687 2688 // Print relocation information 2689 const char* str = reloc_string_for(begin, end); 2690 if (str != NULL) { 2691 if (sd != NULL) st->cr(); 2692 st->move_to(column); 2693 st->print("; {%s}", str); 2694 } 2695 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin()); 2696 if (cont_offset != 0) { 2697 st->move_to(column); 2698 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset)); 2699 } 2700 2701 } 2702 2703 class DirectNativeCallWrapper: public NativeCallWrapper { 2704 private: 2705 NativeCall* _call; 2706 2707 public: 2708 DirectNativeCallWrapper(NativeCall* call) : _call(call) {} 2709 2710 virtual address destination() const { return _call->destination(); } 2711 virtual address instruction_address() const { return _call->instruction_address(); } 2712 virtual address next_instruction_address() const { return _call->next_instruction_address(); } 2713 virtual address return_address() const { return _call->return_address(); } 2714 2715 virtual address get_resolve_call_stub(bool is_optimized) const { 2716 if (is_optimized) { 2717 return SharedRuntime::get_resolve_opt_virtual_call_stub(); 2718 } 2719 return SharedRuntime::get_resolve_virtual_call_stub(); 2720 } 2721 2722 virtual void set_destination_mt_safe(address dest) { 2723 #if INCLUDE_AOT 2724 if (UseAOT) { 2725 CodeBlob* callee = CodeCache::find_blob(dest); 2726 CompiledMethod* cm = callee->as_compiled_method_or_null(); 2727 if (cm != NULL && cm->is_far_code()) { 2728 // Temporary fix, see JDK-8143106 2729 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address()); 2730 csc->set_to_far(methodHandle(cm->method()), dest); 2731 return; 2732 } 2733 } 2734 #endif 2735 _call->set_destination_mt_safe(dest); 2736 } 2737 2738 virtual void set_to_interpreted(const methodHandle& method, CompiledICInfo& info) { 2739 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address()); 2740 #if INCLUDE_AOT 2741 if (info.to_aot()) { 2742 csc->set_to_far(method, info.entry()); 2743 } else 2744 #endif 2745 { 2746 csc->set_to_interpreted(method, info.entry()); 2747 } 2748 } 2749 2750 virtual void verify() const { 2751 // make sure code pattern is actually a call imm32 instruction 2752 _call->verify(); 2753 _call->verify_alignment(); 2754 } 2755 2756 virtual void verify_resolve_call(address dest) const { 2757 CodeBlob* db = CodeCache::find_blob_unsafe(dest); 2758 assert(db != NULL && !db->is_adapter_blob(), "must use stub!"); 2759 } 2760 2761 virtual bool is_call_to_interpreted(address dest) const { 2762 CodeBlob* cb = CodeCache::find_blob(_call->instruction_address()); 2763 return cb->contains(dest); 2764 } 2765 2766 virtual bool is_safe_for_patching() const { return false; } 2767 2768 virtual NativeInstruction* get_load_instruction(virtual_call_Relocation* r) const { 2769 return nativeMovConstReg_at(r->cached_value()); 2770 } 2771 2772 virtual void *get_data(NativeInstruction* instruction) const { 2773 return (void*)((NativeMovConstReg*) instruction)->data(); 2774 } 2775 2776 virtual void set_data(NativeInstruction* instruction, intptr_t data) { 2777 ((NativeMovConstReg*) instruction)->set_data(data); 2778 } 2779 }; 2780 2781 NativeCallWrapper* nmethod::call_wrapper_at(address call) const { 2782 return new DirectNativeCallWrapper((NativeCall*) call); 2783 } 2784 2785 NativeCallWrapper* nmethod::call_wrapper_before(address return_pc) const { 2786 return new DirectNativeCallWrapper(nativeCall_before(return_pc)); 2787 } 2788 2789 address nmethod::call_instruction_address(address pc) const { 2790 if (NativeCall::is_call_before(pc)) { 2791 NativeCall *ncall = nativeCall_before(pc); 2792 return ncall->instruction_address(); 2793 } 2794 return NULL; 2795 } 2796 2797 CompiledStaticCall* nmethod::compiledStaticCall_at(Relocation* call_site) const { 2798 return CompiledDirectStaticCall::at(call_site); 2799 } 2800 2801 CompiledStaticCall* nmethod::compiledStaticCall_at(address call_site) const { 2802 return CompiledDirectStaticCall::at(call_site); 2803 } 2804 2805 CompiledStaticCall* nmethod::compiledStaticCall_before(address return_addr) const { 2806 return CompiledDirectStaticCall::before(return_addr); 2807 } 2808 2809 #ifndef PRODUCT 2810 2811 void nmethod::print_value_on(outputStream* st) const { 2812 st->print("nmethod"); 2813 print_on(st, NULL); 2814 } 2815 2816 void nmethod::print_calls(outputStream* st) { 2817 RelocIterator iter(this); 2818 while (iter.next()) { 2819 switch (iter.type()) { 2820 case relocInfo::virtual_call_type: 2821 case relocInfo::opt_virtual_call_type: { 2822 VerifyMutexLocker mc(CompiledIC_lock); 2823 CompiledIC_at(&iter)->print(); 2824 break; 2825 } 2826 case relocInfo::static_call_type: 2827 st->print_cr("Static call at " INTPTR_FORMAT, p2i(iter.reloc()->addr())); 2828 CompiledDirectStaticCall::at(iter.reloc())->print(); 2829 break; 2830 default: 2831 break; 2832 } 2833 } 2834 } 2835 2836 void nmethod::print_handler_table() { 2837 ExceptionHandlerTable(this).print(); 2838 } 2839 2840 void nmethod::print_nul_chk_table() { 2841 ImplicitExceptionTable(this).print(code_begin()); 2842 } 2843 2844 void nmethod::print_statistics() { 2845 ttyLocker ttyl; 2846 if (xtty != NULL) xtty->head("statistics type='nmethod'"); 2847 native_nmethod_stats.print_native_nmethod_stats(); 2848 #ifdef COMPILER1 2849 c1_java_nmethod_stats.print_nmethod_stats("C1"); 2850 #endif 2851 #ifdef COMPILER2 2852 c2_java_nmethod_stats.print_nmethod_stats("C2"); 2853 #endif 2854 #if INCLUDE_JVMCI 2855 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI"); 2856 #endif 2857 unknown_java_nmethod_stats.print_nmethod_stats("Unknown"); 2858 DebugInformationRecorder::print_statistics(); 2859 #ifndef PRODUCT 2860 pc_nmethod_stats.print_pc_stats(); 2861 #endif 2862 Dependencies::print_statistics(); 2863 if (xtty != NULL) xtty->tail("statistics"); 2864 } 2865 2866 #endif // !PRODUCT 2867 2868 #if INCLUDE_JVMCI 2869 void nmethod::clear_jvmci_installed_code() { 2870 assert_locked_or_safepoint(Patching_lock); 2871 if (_jvmci_installed_code != NULL) { 2872 JNIHandles::destroy_weak_global(_jvmci_installed_code); 2873 _jvmci_installed_code = NULL; 2874 } 2875 } 2876 2877 void nmethod::clear_speculation_log() { 2878 assert_locked_or_safepoint(Patching_lock); 2879 if (_speculation_log != NULL) { 2880 JNIHandles::destroy_weak_global(_speculation_log); 2881 _speculation_log = NULL; 2882 } 2883 } 2884 2885 void nmethod::maybe_invalidate_installed_code() { 2886 assert(Patching_lock->is_locked() || 2887 SafepointSynchronize::is_at_safepoint(), "should be performed under a lock for consistency"); 2888 oop installed_code = JNIHandles::resolve(_jvmci_installed_code); 2889 if (installed_code != NULL) { 2890 // Update the values in the InstalledCode instance if it still refers to this nmethod 2891 nmethod* nm = (nmethod*)InstalledCode::address(installed_code); 2892 if (nm == this) { 2893 if (!is_alive()) { 2894 // Break the link between nmethod and InstalledCode such that the nmethod 2895 // can subsequently be flushed safely. The link must be maintained while 2896 // the method could have live activations since invalidateInstalledCode 2897 // might want to invalidate all existing activations. 2898 InstalledCode::set_address(installed_code, 0); 2899 InstalledCode::set_entryPoint(installed_code, 0); 2900 } else if (is_not_entrant()) { 2901 // Remove the entry point so any invocation will fail but keep 2902 // the address link around that so that existing activations can 2903 // be invalidated. 2904 InstalledCode::set_entryPoint(installed_code, 0); 2905 } 2906 } 2907 } 2908 if (!is_alive()) { 2909 // Clear these out after the nmethod has been unregistered and any 2910 // updates to the InstalledCode instance have been performed. 2911 clear_jvmci_installed_code(); 2912 clear_speculation_log(); 2913 } 2914 } 2915 2916 void nmethod::invalidate_installed_code(Handle installedCode, TRAPS) { 2917 if (installedCode() == NULL) { 2918 THROW(vmSymbols::java_lang_NullPointerException()); 2919 } 2920 jlong nativeMethod = InstalledCode::address(installedCode); 2921 nmethod* nm = (nmethod*)nativeMethod; 2922 if (nm == NULL) { 2923 // Nothing to do 2924 return; 2925 } 2926 2927 nmethodLocker nml(nm); 2928 #ifdef ASSERT 2929 { 2930 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 2931 // This relationship can only be checked safely under a lock 2932 assert(!nm->is_alive() || nm->jvmci_installed_code() == installedCode(), "sanity check"); 2933 } 2934 #endif 2935 2936 if (nm->is_alive()) { 2937 // Invalidating the InstalledCode means we want the nmethod 2938 // to be deoptimized. 2939 nm->mark_for_deoptimization(); 2940 VM_Deoptimize op; 2941 VMThread::execute(&op); 2942 } 2943 2944 // Multiple threads could reach this point so we now need to 2945 // lock and re-check the link to the nmethod so that only one 2946 // thread clears it. 2947 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 2948 if (InstalledCode::address(installedCode) == nativeMethod) { 2949 InstalledCode::set_address(installedCode, 0); 2950 } 2951 } 2952 2953 oop nmethod::jvmci_installed_code() { 2954 return JNIHandles::resolve(_jvmci_installed_code); 2955 } 2956 2957 oop nmethod::speculation_log() { 2958 return JNIHandles::resolve(_speculation_log); 2959 } 2960 2961 char* nmethod::jvmci_installed_code_name(char* buf, size_t buflen) const { 2962 if (!this->is_compiled_by_jvmci()) { 2963 return NULL; 2964 } 2965 oop installed_code = JNIHandles::resolve(_jvmci_installed_code); 2966 if (installed_code != NULL) { 2967 oop installed_code_name = NULL; 2968 if (installed_code->is_a(InstalledCode::klass())) { 2969 installed_code_name = InstalledCode::name(installed_code); 2970 } 2971 if (installed_code_name != NULL) { 2972 return java_lang_String::as_utf8_string(installed_code_name, buf, (int)buflen); 2973 } 2974 } 2975 return NULL; 2976 } 2977 #endif