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_unloading = 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_unloading = false; 694 } else { 695 _jvmci_installed_code_triggers_unloading = 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 } 790 791 792 #define LOG_OFFSET(log, name) \ 793 if (p2i(name##_end()) - p2i(name##_begin())) \ 794 log->print(" " XSTR(name) "_offset='" INTX_FORMAT "'" , \ 795 p2i(name##_begin()) - p2i(this)) 796 797 798 void nmethod::log_new_nmethod() const { 799 if (LogCompilation && xtty != NULL) { 800 ttyLocker ttyl; 801 HandleMark hm; 802 xtty->begin_elem("nmethod"); 803 log_identity(xtty); 804 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size()); 805 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this)); 806 807 LOG_OFFSET(xtty, relocation); 808 LOG_OFFSET(xtty, consts); 809 LOG_OFFSET(xtty, insts); 810 LOG_OFFSET(xtty, stub); 811 LOG_OFFSET(xtty, scopes_data); 812 LOG_OFFSET(xtty, scopes_pcs); 813 LOG_OFFSET(xtty, dependencies); 814 LOG_OFFSET(xtty, handler_table); 815 LOG_OFFSET(xtty, nul_chk_table); 816 LOG_OFFSET(xtty, oops); 817 LOG_OFFSET(xtty, metadata); 818 819 xtty->method(method()); 820 xtty->stamp(); 821 xtty->end_elem(); 822 } 823 } 824 825 #undef LOG_OFFSET 826 827 828 // Print out more verbose output usually for a newly created nmethod. 829 void nmethod::print_on(outputStream* st, const char* msg) const { 830 if (st != NULL) { 831 ttyLocker ttyl; 832 if (WizardMode) { 833 CompileTask::print(st, this, msg, /*short_form:*/ true); 834 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this)); 835 } else { 836 CompileTask::print(st, this, msg, /*short_form:*/ false); 837 } 838 } 839 } 840 841 void nmethod::maybe_print_nmethod(DirectiveSet* directive) { 842 bool printnmethods = directive->PrintAssemblyOption || directive->PrintNMethodsOption; 843 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) { 844 print_nmethod(printnmethods); 845 } 846 } 847 848 void nmethod::print_nmethod(bool printmethod) { 849 ttyLocker ttyl; // keep the following output all in one block 850 if (xtty != NULL) { 851 xtty->begin_head("print_nmethod"); 852 xtty->stamp(); 853 xtty->end_head(); 854 } 855 // print the header part first 856 print(); 857 // then print the requested information 858 if (printmethod) { 859 print_code(); 860 print_pcs(); 861 if (oop_maps()) { 862 oop_maps()->print(); 863 } 864 } 865 if (printmethod || PrintDebugInfo || CompilerOracle::has_option_string(_method, "PrintDebugInfo")) { 866 print_scopes(); 867 } 868 if (printmethod || PrintRelocations || CompilerOracle::has_option_string(_method, "PrintRelocations")) { 869 print_relocations(); 870 } 871 if (printmethod || PrintDependencies || CompilerOracle::has_option_string(_method, "PrintDependencies")) { 872 print_dependencies(); 873 } 874 if (printmethod || PrintExceptionHandlers) { 875 print_handler_table(); 876 print_nul_chk_table(); 877 } 878 if (printmethod) { 879 print_recorded_oops(); 880 print_recorded_metadata(); 881 } 882 if (xtty != NULL) { 883 xtty->tail("print_nmethod"); 884 } 885 } 886 887 888 // Promote one word from an assembly-time handle to a live embedded oop. 889 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) { 890 if (handle == NULL || 891 // As a special case, IC oops are initialized to 1 or -1. 892 handle == (jobject) Universe::non_oop_word()) { 893 (*dest) = (oop) handle; 894 } else { 895 (*dest) = JNIHandles::resolve_non_null(handle); 896 } 897 } 898 899 900 // Have to have the same name because it's called by a template 901 void nmethod::copy_values(GrowableArray<jobject>* array) { 902 int length = array->length(); 903 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough"); 904 oop* dest = oops_begin(); 905 for (int index = 0 ; index < length; index++) { 906 initialize_immediate_oop(&dest[index], array->at(index)); 907 } 908 909 // Now we can fix up all the oops in the code. We need to do this 910 // in the code because the assembler uses jobjects as placeholders. 911 // The code and relocations have already been initialized by the 912 // CodeBlob constructor, so it is valid even at this early point to 913 // iterate over relocations and patch the code. 914 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true); 915 } 916 917 void nmethod::copy_values(GrowableArray<Metadata*>* array) { 918 int length = array->length(); 919 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough"); 920 Metadata** dest = metadata_begin(); 921 for (int index = 0 ; index < length; index++) { 922 dest[index] = array->at(index); 923 } 924 } 925 926 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) { 927 // re-patch all oop-bearing instructions, just in case some oops moved 928 RelocIterator iter(this, begin, end); 929 while (iter.next()) { 930 if (iter.type() == relocInfo::oop_type) { 931 oop_Relocation* reloc = iter.oop_reloc(); 932 if (initialize_immediates && reloc->oop_is_immediate()) { 933 oop* dest = reloc->oop_addr(); 934 initialize_immediate_oop(dest, (jobject) *dest); 935 } 936 // Refresh the oop-related bits of this instruction. 937 reloc->fix_oop_relocation(); 938 } else if (iter.type() == relocInfo::metadata_type) { 939 metadata_Relocation* reloc = iter.metadata_reloc(); 940 reloc->fix_metadata_relocation(); 941 } 942 } 943 } 944 945 946 void nmethod::verify_clean_inline_caches() { 947 assert_locked_or_safepoint(CompiledIC_lock); 948 949 ResourceMark rm; 950 RelocIterator iter(this, oops_reloc_begin()); 951 while(iter.next()) { 952 switch(iter.type()) { 953 case relocInfo::virtual_call_type: 954 case relocInfo::opt_virtual_call_type: { 955 CompiledIC *ic = CompiledIC_at(&iter); 956 // Ok, to lookup references to zombies here 957 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination()); 958 assert(cb != NULL, "destination not in CodeBlob?"); 959 nmethod* nm = cb->as_nmethod_or_null(); 960 if( nm != NULL ) { 961 // Verify that inline caches pointing to both zombie and not_entrant methods are clean 962 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 963 assert(ic->is_clean(), "IC should be clean"); 964 } 965 } 966 break; 967 } 968 case relocInfo::static_call_type: { 969 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc()); 970 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination()); 971 assert(cb != NULL, "destination not in CodeBlob?"); 972 nmethod* nm = cb->as_nmethod_or_null(); 973 if( nm != NULL ) { 974 // Verify that inline caches pointing to both zombie and not_entrant methods are clean 975 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 976 assert(csc->is_clean(), "IC should be clean"); 977 } 978 } 979 break; 980 } 981 default: 982 break; 983 } 984 } 985 } 986 987 // This is a private interface with the sweeper. 988 void nmethod::mark_as_seen_on_stack() { 989 assert(is_alive(), "Must be an alive method"); 990 // Set the traversal mark to ensure that the sweeper does 2 991 // cleaning passes before moving to zombie. 992 set_stack_traversal_mark(NMethodSweeper::traversal_count()); 993 } 994 995 // Tell if a non-entrant method can be converted to a zombie (i.e., 996 // there are no activations on the stack, not in use by the VM, 997 // and not in use by the ServiceThread) 998 bool nmethod::can_convert_to_zombie() { 999 assert(is_not_entrant(), "must be a non-entrant method"); 1000 1001 // Since the nmethod sweeper only does partial sweep the sweeper's traversal 1002 // count can be greater than the stack traversal count before it hits the 1003 // nmethod for the second time. 1004 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count() && 1005 !is_locked_by_vm(); 1006 } 1007 1008 void nmethod::inc_decompile_count() { 1009 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return; 1010 // Could be gated by ProfileTraps, but do not bother... 1011 Method* m = method(); 1012 if (m == NULL) return; 1013 MethodData* mdo = m->method_data(); 1014 if (mdo == NULL) return; 1015 // There is a benign race here. See comments in methodData.hpp. 1016 mdo->inc_decompile_count(); 1017 } 1018 1019 void nmethod::make_unloaded(oop cause) { 1020 1021 post_compiled_method_unload(); 1022 1023 // This nmethod is being unloaded, make sure that dependencies 1024 // recorded in instanceKlasses get flushed. 1025 // Since this work is being done during a GC, defer deleting dependencies from the 1026 // InstanceKlass. 1027 assert(Universe::heap()->is_gc_active(), "should only be called during gc"); 1028 flush_dependencies(/*delete_immediately*/false); 1029 1030 // Break cycle between nmethod & method 1031 LogTarget(Trace, class, unload, nmethod) lt; 1032 if (lt.is_enabled()) { 1033 LogStream ls(lt); 1034 ls.print("making nmethod " INTPTR_FORMAT 1035 " unloadable, Method*(" INTPTR_FORMAT 1036 "), cause(" INTPTR_FORMAT ") ", 1037 p2i(this), p2i(_method), p2i(cause)); 1038 if (cause != NULL) { 1039 cause->print_value_on(&ls); 1040 } 1041 ls.cr(); 1042 } 1043 // Unlink the osr method, so we do not look this up again 1044 if (is_osr_method()) { 1045 // Invalidate the osr nmethod only once 1046 if (is_in_use()) { 1047 invalidate_osr_method(); 1048 } 1049 #ifdef ASSERT 1050 if (method() != NULL) { 1051 // Make sure osr nmethod is invalidated, i.e. not on the list 1052 bool found = method()->method_holder()->remove_osr_nmethod(this); 1053 assert(!found, "osr nmethod should have been invalidated"); 1054 } 1055 #endif 1056 } 1057 1058 // If _method is already NULL the Method* is about to be unloaded, 1059 // so we don't have to break the cycle. Note that it is possible to 1060 // have the Method* live here, in case we unload the nmethod because 1061 // it is pointing to some oop (other than the Method*) being unloaded. 1062 if (_method != NULL) { 1063 // OSR methods point to the Method*, but the Method* does not 1064 // point back! 1065 if (_method->code() == this) { 1066 _method->clear_code(); // Break a cycle 1067 } 1068 _method = NULL; // Clear the method of this dead nmethod 1069 } 1070 1071 // Make the class unloaded - i.e., change state and notify sweeper 1072 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); 1073 if (is_in_use()) { 1074 // Transitioning directly from live to unloaded -- so 1075 // we need to force a cache clean-up; remember this 1076 // for later on. 1077 CodeCache::set_needs_cache_clean(true); 1078 } 1079 1080 // Unregister must be done before the state change 1081 Universe::heap()->unregister_nmethod(this); 1082 1083 _state = unloaded; 1084 1085 // Log the unloading. 1086 log_state_change(); 1087 1088 #if INCLUDE_JVMCI 1089 // The method can only be unloaded after the pointer to the installed code 1090 // Java wrapper is no longer alive. Here we need to clear out this weak 1091 // reference to the dead object. 1092 maybe_invalidate_installed_code(); 1093 #endif 1094 1095 // The Method* is gone at this point 1096 assert(_method == NULL, "Tautology"); 1097 1098 set_osr_link(NULL); 1099 NMethodSweeper::report_state_change(this); 1100 } 1101 1102 void nmethod::invalidate_osr_method() { 1103 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); 1104 // Remove from list of active nmethods 1105 if (method() != NULL) { 1106 method()->method_holder()->remove_osr_nmethod(this); 1107 } 1108 } 1109 1110 void nmethod::log_state_change() const { 1111 if (LogCompilation) { 1112 if (xtty != NULL) { 1113 ttyLocker ttyl; // keep the following output all in one block 1114 if (_state == unloaded) { 1115 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'", 1116 os::current_thread_id()); 1117 } else { 1118 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s", 1119 os::current_thread_id(), 1120 (_state == zombie ? " zombie='1'" : "")); 1121 } 1122 log_identity(xtty); 1123 xtty->stamp(); 1124 xtty->end_elem(); 1125 } 1126 } 1127 1128 const char *state_msg = _state == zombie ? "made zombie" : "made not entrant"; 1129 CompileTask::print_ul(this, state_msg); 1130 if (PrintCompilation && _state != unloaded) { 1131 print_on(tty, state_msg); 1132 } 1133 } 1134 1135 /** 1136 * Common functionality for both make_not_entrant and make_zombie 1137 */ 1138 bool nmethod::make_not_entrant_or_zombie(int state) { 1139 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant"); 1140 assert(!is_zombie(), "should not already be a zombie"); 1141 1142 if (_state == state) { 1143 // Avoid taking the lock if already in required state. 1144 // This is safe from races because the state is an end-state, 1145 // which the nmethod cannot back out of once entered. 1146 // No need for fencing either. 1147 return false; 1148 } 1149 1150 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below. 1151 nmethodLocker nml(this); 1152 methodHandle the_method(method()); 1153 NoSafepointVerifier nsv; 1154 1155 // during patching, depending on the nmethod state we must notify the GC that 1156 // code has been unloaded, unregistering it. We cannot do this right while 1157 // holding the Patching_lock because we need to use the CodeCache_lock. This 1158 // would be prone to deadlocks. 1159 // This flag is used to remember whether we need to later lock and unregister. 1160 bool nmethod_needs_unregister = false; 1161 1162 { 1163 // invalidate osr nmethod before acquiring the patching lock since 1164 // they both acquire leaf locks and we don't want a deadlock. 1165 // This logic is equivalent to the logic below for patching the 1166 // verified entry point of regular methods. We check that the 1167 // nmethod is in use to ensure that it is invalidated only once. 1168 if (is_osr_method() && is_in_use()) { 1169 // this effectively makes the osr nmethod not entrant 1170 invalidate_osr_method(); 1171 } 1172 1173 // Enter critical section. Does not block for safepoint. 1174 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 1175 1176 if (_state == state) { 1177 // another thread already performed this transition so nothing 1178 // to do, but return false to indicate this. 1179 return false; 1180 } 1181 1182 // The caller can be calling the method statically or through an inline 1183 // cache call. 1184 if (!is_osr_method() && !is_not_entrant()) { 1185 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(), 1186 SharedRuntime::get_handle_wrong_method_stub()); 1187 } 1188 1189 if (is_in_use() && update_recompile_counts()) { 1190 // It's a true state change, so mark the method as decompiled. 1191 // Do it only for transition from alive. 1192 inc_decompile_count(); 1193 } 1194 1195 // If the state is becoming a zombie, signal to unregister the nmethod with 1196 // the heap. 1197 // This nmethod may have already been unloaded during a full GC. 1198 if ((state == zombie) && !is_unloaded()) { 1199 nmethod_needs_unregister = true; 1200 } 1201 1202 // Must happen before state change. Otherwise we have a race condition in 1203 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately 1204 // transition its state from 'not_entrant' to 'zombie' without having to wait 1205 // for stack scanning. 1206 if (state == not_entrant) { 1207 mark_as_seen_on_stack(); 1208 OrderAccess::storestore(); // _stack_traversal_mark and _state 1209 } 1210 1211 // Change state 1212 _state = state; 1213 1214 // Log the transition once 1215 log_state_change(); 1216 1217 // Invalidate while holding the patching lock 1218 JVMCI_ONLY(maybe_invalidate_installed_code()); 1219 1220 // Remove nmethod from method. 1221 // We need to check if both the _code and _from_compiled_code_entry_point 1222 // refer to this nmethod because there is a race in setting these two fields 1223 // in Method* as seen in bugid 4947125. 1224 // If the vep() points to the zombie nmethod, the memory for the nmethod 1225 // could be flushed and the compiler and vtable stubs could still call 1226 // through it. 1227 if (method() != NULL && (method()->code() == this || 1228 method()->from_compiled_entry() == verified_entry_point())) { 1229 HandleMark hm; 1230 method()->clear_code(false /* already owns Patching_lock */); 1231 } 1232 } // leave critical region under Patching_lock 1233 1234 #ifdef ASSERT 1235 if (is_osr_method() && method() != NULL) { 1236 // Make sure osr nmethod is invalidated, i.e. not on the list 1237 bool found = method()->method_holder()->remove_osr_nmethod(this); 1238 assert(!found, "osr nmethod should have been invalidated"); 1239 } 1240 #endif 1241 1242 // When the nmethod becomes zombie it is no longer alive so the 1243 // dependencies must be flushed. nmethods in the not_entrant 1244 // state will be flushed later when the transition to zombie 1245 // happens or they get unloaded. 1246 if (state == zombie) { 1247 { 1248 // Flushing dependencies must be done before any possible 1249 // safepoint can sneak in, otherwise the oops used by the 1250 // dependency logic could have become stale. 1251 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1252 if (nmethod_needs_unregister) { 1253 Universe::heap()->unregister_nmethod(this); 1254 } 1255 flush_dependencies(/*delete_immediately*/true); 1256 } 1257 1258 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload 1259 // event and it hasn't already been reported for this nmethod then 1260 // report it now. The event may have been reported earlier if the GC 1261 // marked it for unloading). JvmtiDeferredEventQueue support means 1262 // we no longer go to a safepoint here. 1263 post_compiled_method_unload(); 1264 1265 #ifdef ASSERT 1266 // It's no longer safe to access the oops section since zombie 1267 // nmethods aren't scanned for GC. 1268 _oops_are_stale = true; 1269 #endif 1270 // the Method may be reclaimed by class unloading now that the 1271 // nmethod is in zombie state 1272 set_method(NULL); 1273 } else { 1274 assert(state == not_entrant, "other cases may need to be handled differently"); 1275 } 1276 1277 if (TraceCreateZombies) { 1278 ResourceMark m; 1279 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"); 1280 } 1281 1282 NMethodSweeper::report_state_change(this); 1283 return true; 1284 } 1285 1286 void nmethod::flush() { 1287 // Note that there are no valid oops in the nmethod anymore. 1288 assert(!is_osr_method() || is_unloaded() || is_zombie(), 1289 "osr nmethod must be unloaded or zombie before flushing"); 1290 assert(is_zombie() || is_osr_method(), "must be a zombie method"); 1291 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed"); 1292 assert_locked_or_safepoint(CodeCache_lock); 1293 1294 // completely deallocate this method 1295 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, p2i(this)); 1296 if (PrintMethodFlushing) { 1297 tty->print_cr("*flushing %s nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT 1298 "/Free CodeCache:" SIZE_FORMAT "Kb", 1299 is_osr_method() ? "osr" : "",_compile_id, p2i(this), CodeCache::blob_count(), 1300 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024); 1301 } 1302 1303 // We need to deallocate any ExceptionCache data. 1304 // Note that we do not need to grab the nmethod lock for this, it 1305 // better be thread safe if we're disposing of it! 1306 ExceptionCache* ec = exception_cache(); 1307 set_exception_cache(NULL); 1308 while(ec != NULL) { 1309 ExceptionCache* next = ec->next(); 1310 delete ec; 1311 ec = next; 1312 } 1313 1314 if (on_scavenge_root_list()) { 1315 CodeCache::drop_scavenge_root_nmethod(this); 1316 } 1317 1318 #if INCLUDE_JVMCI 1319 assert(_jvmci_installed_code == NULL, "should have been nulled out when transitioned to zombie"); 1320 assert(_speculation_log == NULL, "should have been nulled out when transitioned to zombie"); 1321 #endif 1322 1323 CodeBlob::flush(); 1324 CodeCache::free(this); 1325 } 1326 1327 // 1328 // Notify all classes this nmethod is dependent on that it is no 1329 // longer dependent. This should only be called in two situations. 1330 // First, when a nmethod transitions to a zombie all dependents need 1331 // to be clear. Since zombification happens at a safepoint there's no 1332 // synchronization issues. The second place is a little more tricky. 1333 // During phase 1 of mark sweep class unloading may happen and as a 1334 // result some nmethods may get unloaded. In this case the flushing 1335 // of dependencies must happen during phase 1 since after GC any 1336 // dependencies in the unloaded nmethod won't be updated, so 1337 // traversing the dependency information in unsafe. In that case this 1338 // function is called with a boolean argument and this function only 1339 // notifies instanceKlasses that are reachable 1340 1341 void nmethod::flush_dependencies(bool delete_immediately) { 1342 assert_locked_or_safepoint(CodeCache_lock); 1343 assert(Universe::heap()->is_gc_active() != delete_immediately, 1344 "delete_immediately is false if and only if we are called during GC"); 1345 if (!has_flushed_dependencies()) { 1346 set_has_flushed_dependencies(); 1347 for (Dependencies::DepStream deps(this); deps.next(); ) { 1348 if (deps.type() == Dependencies::call_site_target_value) { 1349 // CallSite dependencies are managed on per-CallSite instance basis. 1350 oop call_site = deps.argument_oop(0); 1351 MethodHandles::remove_dependent_nmethod(call_site, this); 1352 } else { 1353 Klass* klass = deps.context_type(); 1354 if (klass == NULL) { 1355 continue; // ignore things like evol_method 1356 } 1357 // During GC delete_immediately is false, and liveness 1358 // of dependee determines class that needs to be updated. 1359 if (delete_immediately || klass->is_loader_alive()) { 1360 // The GC defers deletion of this entry, since there might be multiple threads 1361 // iterating over the _dependencies graph. Other call paths are single-threaded 1362 // and may delete it immediately. 1363 InstanceKlass::cast(klass)->remove_dependent_nmethod(this, delete_immediately); 1364 } 1365 } 1366 } 1367 } 1368 } 1369 1370 1371 // If this oop is not live, the nmethod can be unloaded. 1372 bool nmethod::can_unload(BoolObjectClosure* is_alive, oop* root) { 1373 assert(root != NULL, "just checking"); 1374 oop obj = *root; 1375 if (obj == NULL || is_alive->do_object_b(obj)) { 1376 return false; 1377 } 1378 1379 // An nmethod might be unloaded simply because one of its constant oops has gone dead. 1380 // No actual classes need to be unloaded in order for this to occur. 1381 make_unloaded(obj); 1382 return true; 1383 } 1384 1385 // ------------------------------------------------------------------ 1386 // post_compiled_method_load_event 1387 // new method for install_code() path 1388 // Transfer information from compilation to jvmti 1389 void nmethod::post_compiled_method_load_event() { 1390 1391 Method* moop = method(); 1392 HOTSPOT_COMPILED_METHOD_LOAD( 1393 (char *) moop->klass_name()->bytes(), 1394 moop->klass_name()->utf8_length(), 1395 (char *) moop->name()->bytes(), 1396 moop->name()->utf8_length(), 1397 (char *) moop->signature()->bytes(), 1398 moop->signature()->utf8_length(), 1399 insts_begin(), insts_size()); 1400 1401 if (JvmtiExport::should_post_compiled_method_load() || 1402 JvmtiExport::should_post_compiled_method_unload()) { 1403 get_and_cache_jmethod_id(); 1404 } 1405 1406 if (JvmtiExport::should_post_compiled_method_load()) { 1407 // Let the Service thread (which is a real Java thread) post the event 1408 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); 1409 JvmtiDeferredEventQueue::enqueue( 1410 JvmtiDeferredEvent::compiled_method_load_event(this)); 1411 } 1412 } 1413 1414 jmethodID nmethod::get_and_cache_jmethod_id() { 1415 if (_jmethod_id == NULL) { 1416 // Cache the jmethod_id since it can no longer be looked up once the 1417 // method itself has been marked for unloading. 1418 _jmethod_id = method()->jmethod_id(); 1419 } 1420 return _jmethod_id; 1421 } 1422 1423 void nmethod::post_compiled_method_unload() { 1424 if (unload_reported()) { 1425 // During unloading we transition to unloaded and then to zombie 1426 // and the unloading is reported during the first transition. 1427 return; 1428 } 1429 1430 assert(_method != NULL && !is_unloaded(), "just checking"); 1431 DTRACE_METHOD_UNLOAD_PROBE(method()); 1432 1433 // If a JVMTI agent has enabled the CompiledMethodUnload event then 1434 // post the event. Sometime later this nmethod will be made a zombie 1435 // by the sweeper but the Method* will not be valid at that point. 1436 // If the _jmethod_id is null then no load event was ever requested 1437 // so don't bother posting the unload. The main reason for this is 1438 // that the jmethodID is a weak reference to the Method* so if 1439 // it's being unloaded there's no way to look it up since the weak 1440 // ref will have been cleared. 1441 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) { 1442 assert(!unload_reported(), "already unloaded"); 1443 JvmtiDeferredEvent event = 1444 JvmtiDeferredEvent::compiled_method_unload_event(this, 1445 _jmethod_id, insts_begin()); 1446 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); 1447 JvmtiDeferredEventQueue::enqueue(event); 1448 } 1449 1450 // The JVMTI CompiledMethodUnload event can be enabled or disabled at 1451 // any time. As the nmethod is being unloaded now we mark it has 1452 // having the unload event reported - this will ensure that we don't 1453 // attempt to report the event in the unlikely scenario where the 1454 // event is enabled at the time the nmethod is made a zombie. 1455 set_unload_reported(); 1456 } 1457 1458 bool nmethod::unload_if_dead_at(RelocIterator* iter_at_oop, BoolObjectClosure *is_alive) { 1459 assert(iter_at_oop->type() == relocInfo::oop_type, "Wrong relocation type"); 1460 1461 oop_Relocation* r = iter_at_oop->oop_reloc(); 1462 // Traverse those oops directly embedded in the code. 1463 // Other oops (oop_index>0) are seen as part of scopes_oops. 1464 assert(1 == (r->oop_is_immediate()) + 1465 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 1466 "oop must be found in exactly one place"); 1467 if (r->oop_is_immediate() && r->oop_value() != NULL) { 1468 // Unload this nmethod if the oop is dead. 1469 if (can_unload(is_alive, r->oop_addr())) { 1470 return true;; 1471 } 1472 } 1473 1474 return false; 1475 } 1476 1477 bool nmethod::do_unloading_scopes(BoolObjectClosure* is_alive) { 1478 // Scopes 1479 for (oop* p = oops_begin(); p < oops_end(); p++) { 1480 if (*p == Universe::non_oop_word()) continue; // skip non-oops 1481 if (can_unload(is_alive, p)) { 1482 return true; 1483 } 1484 } 1485 return false; 1486 } 1487 1488 bool nmethod::do_unloading_oops(address low_boundary, BoolObjectClosure* is_alive) { 1489 // Compiled code 1490 1491 // Prevent extra code cache walk for platforms that don't have immediate oops. 1492 if (relocInfo::mustIterateImmediateOopsInCode()) { 1493 RelocIterator iter(this, low_boundary); 1494 while (iter.next()) { 1495 if (iter.type() == relocInfo::oop_type) { 1496 if (unload_if_dead_at(&iter, is_alive)) { 1497 return true; 1498 } 1499 } 1500 } 1501 } 1502 1503 return do_unloading_scopes(is_alive); 1504 } 1505 1506 #if INCLUDE_JVMCI 1507 bool nmethod::do_unloading_jvmci() { 1508 if (_jvmci_installed_code != NULL) { 1509 if (JNIHandles::is_global_weak_cleared(_jvmci_installed_code)) { 1510 if (_jvmci_installed_code_triggers_unloading) { 1511 // jweak reference processing has already cleared the referent 1512 make_unloaded(NULL); 1513 return true; 1514 } else { 1515 clear_jvmci_installed_code(); 1516 } 1517 } 1518 } 1519 return false; 1520 } 1521 #endif 1522 1523 // Iterate over metadata calling this function. Used by RedefineClasses 1524 void nmethod::metadata_do(void f(Metadata*)) { 1525 { 1526 // Visit all immediate references that are embedded in the instruction stream. 1527 RelocIterator iter(this, oops_reloc_begin()); 1528 while (iter.next()) { 1529 if (iter.type() == relocInfo::metadata_type ) { 1530 metadata_Relocation* r = iter.metadata_reloc(); 1531 // In this metadata, we must only follow those metadatas directly embedded in 1532 // the code. Other metadatas (oop_index>0) are seen as part of 1533 // the metadata section below. 1534 assert(1 == (r->metadata_is_immediate()) + 1535 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()), 1536 "metadata must be found in exactly one place"); 1537 if (r->metadata_is_immediate() && r->metadata_value() != NULL) { 1538 Metadata* md = r->metadata_value(); 1539 if (md != _method) f(md); 1540 } 1541 } else if (iter.type() == relocInfo::virtual_call_type) { 1542 // Check compiledIC holders associated with this nmethod 1543 CompiledIC *ic = CompiledIC_at(&iter); 1544 if (ic->is_icholder_call()) { 1545 CompiledICHolder* cichk = ic->cached_icholder(); 1546 f(cichk->holder_metadata()); 1547 f(cichk->holder_klass()); 1548 } else { 1549 Metadata* ic_oop = ic->cached_metadata(); 1550 if (ic_oop != NULL) { 1551 f(ic_oop); 1552 } 1553 } 1554 } 1555 } 1556 } 1557 1558 // Visit the metadata section 1559 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) { 1560 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops 1561 Metadata* md = *p; 1562 f(md); 1563 } 1564 1565 // Visit metadata not embedded in the other places. 1566 if (_method != NULL) f(_method); 1567 } 1568 1569 void nmethod::oops_do(OopClosure* f, bool allow_zombie) { 1570 // make sure the oops ready to receive visitors 1571 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod"); 1572 assert(!is_unloaded(), "should not call follow on unloaded nmethod"); 1573 1574 // Prevent extra code cache walk for platforms that don't have immediate oops. 1575 if (relocInfo::mustIterateImmediateOopsInCode()) { 1576 RelocIterator iter(this, oops_reloc_begin()); 1577 1578 while (iter.next()) { 1579 if (iter.type() == relocInfo::oop_type ) { 1580 oop_Relocation* r = iter.oop_reloc(); 1581 // In this loop, we must only follow those oops directly embedded in 1582 // the code. Other oops (oop_index>0) are seen as part of scopes_oops. 1583 assert(1 == (r->oop_is_immediate()) + 1584 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 1585 "oop must be found in exactly one place"); 1586 if (r->oop_is_immediate() && r->oop_value() != NULL) { 1587 f->do_oop(r->oop_addr()); 1588 } 1589 } 1590 } 1591 } 1592 1593 // Scopes 1594 // This includes oop constants not inlined in the code stream. 1595 for (oop* p = oops_begin(); p < oops_end(); p++) { 1596 if (*p == Universe::non_oop_word()) continue; // skip non-oops 1597 f->do_oop(p); 1598 } 1599 } 1600 1601 #define NMETHOD_SENTINEL ((nmethod*)badAddress) 1602 1603 nmethod* volatile nmethod::_oops_do_mark_nmethods; 1604 1605 // An nmethod is "marked" if its _mark_link is set non-null. 1606 // Even if it is the end of the linked list, it will have a non-null link value, 1607 // as long as it is on the list. 1608 // This code must be MP safe, because it is used from parallel GC passes. 1609 bool nmethod::test_set_oops_do_mark() { 1610 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called"); 1611 if (_oops_do_mark_link == NULL) { 1612 // Claim this nmethod for this thread to mark. 1613 if (Atomic::replace_if_null(NMETHOD_SENTINEL, &_oops_do_mark_link)) { 1614 // Atomically append this nmethod (now claimed) to the head of the list: 1615 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods; 1616 for (;;) { 1617 nmethod* required_mark_nmethods = observed_mark_nmethods; 1618 _oops_do_mark_link = required_mark_nmethods; 1619 observed_mark_nmethods = 1620 Atomic::cmpxchg(this, &_oops_do_mark_nmethods, required_mark_nmethods); 1621 if (observed_mark_nmethods == required_mark_nmethods) 1622 break; 1623 } 1624 // Mark was clear when we first saw this guy. 1625 LogTarget(Trace, gc, nmethod) lt; 1626 if (lt.is_enabled()) { 1627 LogStream ls(lt); 1628 CompileTask::print(&ls, this, "oops_do, mark", /*short_form:*/ true); 1629 } 1630 return false; 1631 } 1632 } 1633 // On fall through, another racing thread marked this nmethod before we did. 1634 return true; 1635 } 1636 1637 void nmethod::oops_do_marking_prologue() { 1638 log_trace(gc, nmethod)("oops_do_marking_prologue"); 1639 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row"); 1640 // We use cmpxchg instead of regular assignment here because the user 1641 // may fork a bunch of threads, and we need them all to see the same state. 1642 nmethod* observed = Atomic::cmpxchg(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, (nmethod*)NULL); 1643 guarantee(observed == NULL, "no races in this sequential code"); 1644 } 1645 1646 void nmethod::oops_do_marking_epilogue() { 1647 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row"); 1648 nmethod* cur = _oops_do_mark_nmethods; 1649 while (cur != NMETHOD_SENTINEL) { 1650 assert(cur != NULL, "not NULL-terminated"); 1651 nmethod* next = cur->_oops_do_mark_link; 1652 cur->_oops_do_mark_link = NULL; 1653 DEBUG_ONLY(cur->verify_oop_relocations()); 1654 1655 LogTarget(Trace, gc, nmethod) lt; 1656 if (lt.is_enabled()) { 1657 LogStream ls(lt); 1658 CompileTask::print(&ls, cur, "oops_do, unmark", /*short_form:*/ true); 1659 } 1660 cur = next; 1661 } 1662 nmethod* required = _oops_do_mark_nmethods; 1663 nmethod* observed = Atomic::cmpxchg((nmethod*)NULL, &_oops_do_mark_nmethods, required); 1664 guarantee(observed == required, "no races in this sequential code"); 1665 log_trace(gc, nmethod)("oops_do_marking_epilogue"); 1666 } 1667 1668 class DetectScavengeRoot: public OopClosure { 1669 bool _detected_scavenge_root; 1670 nmethod* _print_nm; 1671 public: 1672 DetectScavengeRoot(nmethod* nm) : _detected_scavenge_root(false), _print_nm(nm) {} 1673 1674 bool detected_scavenge_root() { return _detected_scavenge_root; } 1675 virtual void do_oop(oop* p) { 1676 if ((*p) != NULL && Universe::heap()->is_scavengable(*p)) { 1677 NOT_PRODUCT(maybe_print(p)); 1678 _detected_scavenge_root = true; 1679 } 1680 } 1681 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 1682 1683 #ifndef PRODUCT 1684 void maybe_print(oop* p) { 1685 LogTarget(Trace, gc, nmethod) lt; 1686 if (lt.is_enabled()) { 1687 LogStream ls(lt); 1688 if (!_detected_scavenge_root) { 1689 CompileTask::print(&ls, _print_nm, "new scavenge root", /*short_form:*/ true); 1690 } 1691 ls.print("" PTR_FORMAT "[offset=%d] detected scavengable oop " PTR_FORMAT " (found at " PTR_FORMAT ") ", 1692 p2i(_print_nm), (int)((intptr_t)p - (intptr_t)_print_nm), 1693 p2i(*p), p2i(p)); 1694 ls.cr(); 1695 } 1696 } 1697 #endif //PRODUCT 1698 }; 1699 1700 bool nmethod::detect_scavenge_root_oops() { 1701 DetectScavengeRoot detect_scavenge_root(this); 1702 oops_do(&detect_scavenge_root); 1703 return detect_scavenge_root.detected_scavenge_root(); 1704 } 1705 1706 inline bool includes(void* p, void* from, void* to) { 1707 return from <= p && p < to; 1708 } 1709 1710 1711 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) { 1712 assert(count >= 2, "must be sentinel values, at least"); 1713 1714 #ifdef ASSERT 1715 // must be sorted and unique; we do a binary search in find_pc_desc() 1716 int prev_offset = pcs[0].pc_offset(); 1717 assert(prev_offset == PcDesc::lower_offset_limit, 1718 "must start with a sentinel"); 1719 for (int i = 1; i < count; i++) { 1720 int this_offset = pcs[i].pc_offset(); 1721 assert(this_offset > prev_offset, "offsets must be sorted"); 1722 prev_offset = this_offset; 1723 } 1724 assert(prev_offset == PcDesc::upper_offset_limit, 1725 "must end with a sentinel"); 1726 #endif //ASSERT 1727 1728 // Search for MethodHandle invokes and tag the nmethod. 1729 for (int i = 0; i < count; i++) { 1730 if (pcs[i].is_method_handle_invoke()) { 1731 set_has_method_handle_invokes(true); 1732 break; 1733 } 1734 } 1735 assert(has_method_handle_invokes() == (_deopt_mh_handler_begin != NULL), "must have deopt mh handler"); 1736 1737 int size = count * sizeof(PcDesc); 1738 assert(scopes_pcs_size() >= size, "oob"); 1739 memcpy(scopes_pcs_begin(), pcs, size); 1740 1741 // Adjust the final sentinel downward. 1742 PcDesc* last_pc = &scopes_pcs_begin()[count-1]; 1743 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity"); 1744 last_pc->set_pc_offset(content_size() + 1); 1745 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) { 1746 // Fill any rounding gaps with copies of the last record. 1747 last_pc[1] = last_pc[0]; 1748 } 1749 // The following assert could fail if sizeof(PcDesc) is not 1750 // an integral multiple of oopSize (the rounding term). 1751 // If it fails, change the logic to always allocate a multiple 1752 // of sizeof(PcDesc), and fill unused words with copies of *last_pc. 1753 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly"); 1754 } 1755 1756 void nmethod::copy_scopes_data(u_char* buffer, int size) { 1757 assert(scopes_data_size() >= size, "oob"); 1758 memcpy(scopes_data_begin(), buffer, size); 1759 } 1760 1761 #ifdef ASSERT 1762 static PcDesc* linear_search(const PcDescSearch& search, int pc_offset, bool approximate) { 1763 PcDesc* lower = search.scopes_pcs_begin(); 1764 PcDesc* upper = search.scopes_pcs_end(); 1765 lower += 1; // exclude initial sentinel 1766 PcDesc* res = NULL; 1767 for (PcDesc* p = lower; p < upper; p++) { 1768 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc 1769 if (match_desc(p, pc_offset, approximate)) { 1770 if (res == NULL) 1771 res = p; 1772 else 1773 res = (PcDesc*) badAddress; 1774 } 1775 } 1776 return res; 1777 } 1778 #endif 1779 1780 1781 // Finds a PcDesc with real-pc equal to "pc" 1782 PcDesc* PcDescContainer::find_pc_desc_internal(address pc, bool approximate, const PcDescSearch& search) { 1783 address base_address = search.code_begin(); 1784 if ((pc < base_address) || 1785 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) { 1786 return NULL; // PC is wildly out of range 1787 } 1788 int pc_offset = (int) (pc - base_address); 1789 1790 // Check the PcDesc cache if it contains the desired PcDesc 1791 // (This as an almost 100% hit rate.) 1792 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate); 1793 if (res != NULL) { 1794 assert(res == linear_search(search, pc_offset, approximate), "cache ok"); 1795 return res; 1796 } 1797 1798 // Fallback algorithm: quasi-linear search for the PcDesc 1799 // Find the last pc_offset less than the given offset. 1800 // The successor must be the required match, if there is a match at all. 1801 // (Use a fixed radix to avoid expensive affine pointer arithmetic.) 1802 PcDesc* lower = search.scopes_pcs_begin(); 1803 PcDesc* upper = search.scopes_pcs_end(); 1804 upper -= 1; // exclude final sentinel 1805 if (lower >= upper) return NULL; // native method; no PcDescs at all 1806 1807 #define assert_LU_OK \ 1808 /* invariant on lower..upper during the following search: */ \ 1809 assert(lower->pc_offset() < pc_offset, "sanity"); \ 1810 assert(upper->pc_offset() >= pc_offset, "sanity") 1811 assert_LU_OK; 1812 1813 // Use the last successful return as a split point. 1814 PcDesc* mid = _pc_desc_cache.last_pc_desc(); 1815 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 1816 if (mid->pc_offset() < pc_offset) { 1817 lower = mid; 1818 } else { 1819 upper = mid; 1820 } 1821 1822 // Take giant steps at first (4096, then 256, then 16, then 1) 1823 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1); 1824 const int RADIX = (1 << LOG2_RADIX); 1825 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) { 1826 while ((mid = lower + step) < upper) { 1827 assert_LU_OK; 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 break; 1834 } 1835 } 1836 assert_LU_OK; 1837 } 1838 1839 // Sneak up on the value with a linear search of length ~16. 1840 while (true) { 1841 assert_LU_OK; 1842 mid = lower + 1; 1843 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 1844 if (mid->pc_offset() < pc_offset) { 1845 lower = mid; 1846 } else { 1847 upper = mid; 1848 break; 1849 } 1850 } 1851 #undef assert_LU_OK 1852 1853 if (match_desc(upper, pc_offset, approximate)) { 1854 assert(upper == linear_search(search, pc_offset, approximate), "search ok"); 1855 _pc_desc_cache.add_pc_desc(upper); 1856 return upper; 1857 } else { 1858 assert(NULL == linear_search(search, pc_offset, approximate), "search ok"); 1859 return NULL; 1860 } 1861 } 1862 1863 1864 void nmethod::check_all_dependencies(DepChange& changes) { 1865 // Checked dependencies are allocated into this ResourceMark 1866 ResourceMark rm; 1867 1868 // Turn off dependency tracing while actually testing dependencies. 1869 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) ); 1870 1871 typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash, 1872 &DependencySignature::equals, 11027> DepTable; 1873 1874 DepTable* table = new DepTable(); 1875 1876 // Iterate over live nmethods and check dependencies of all nmethods that are not 1877 // marked for deoptimization. A particular dependency is only checked once. 1878 NMethodIterator iter; 1879 while(iter.next()) { 1880 nmethod* nm = iter.method(); 1881 // Only notify for live nmethods 1882 if (nm->is_alive() && !nm->is_marked_for_deoptimization()) { 1883 for (Dependencies::DepStream deps(nm); deps.next(); ) { 1884 // Construct abstraction of a dependency. 1885 DependencySignature* current_sig = new DependencySignature(deps); 1886 1887 // Determine if dependency is already checked. table->put(...) returns 1888 // 'true' if the dependency is added (i.e., was not in the hashtable). 1889 if (table->put(*current_sig, 1)) { 1890 if (deps.check_dependency() != NULL) { 1891 // Dependency checking failed. Print out information about the failed 1892 // dependency and finally fail with an assert. We can fail here, since 1893 // dependency checking is never done in a product build. 1894 tty->print_cr("Failed dependency:"); 1895 changes.print(); 1896 nm->print(); 1897 nm->print_dependencies(); 1898 assert(false, "Should have been marked for deoptimization"); 1899 } 1900 } 1901 } 1902 } 1903 } 1904 } 1905 1906 bool nmethod::check_dependency_on(DepChange& changes) { 1907 // What has happened: 1908 // 1) a new class dependee has been added 1909 // 2) dependee and all its super classes have been marked 1910 bool found_check = false; // set true if we are upset 1911 for (Dependencies::DepStream deps(this); deps.next(); ) { 1912 // Evaluate only relevant dependencies. 1913 if (deps.spot_check_dependency_at(changes) != NULL) { 1914 found_check = true; 1915 NOT_DEBUG(break); 1916 } 1917 } 1918 return found_check; 1919 } 1920 1921 bool nmethod::is_evol_dependent_on(Klass* dependee) { 1922 InstanceKlass *dependee_ik = InstanceKlass::cast(dependee); 1923 Array<Method*>* dependee_methods = dependee_ik->methods(); 1924 for (Dependencies::DepStream deps(this); deps.next(); ) { 1925 if (deps.type() == Dependencies::evol_method) { 1926 Method* method = deps.method_argument(0); 1927 for (int j = 0; j < dependee_methods->length(); j++) { 1928 if (dependee_methods->at(j) == method) { 1929 if (log_is_enabled(Debug, redefine, class, nmethod)) { 1930 ResourceMark rm; 1931 log_debug(redefine, class, nmethod) 1932 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)", 1933 _method->method_holder()->external_name(), 1934 _method->name()->as_C_string(), 1935 _method->signature()->as_C_string(), 1936 compile_id(), 1937 method->method_holder()->external_name(), 1938 method->name()->as_C_string(), 1939 method->signature()->as_C_string()); 1940 } 1941 if (TraceDependencies || LogCompilation) 1942 deps.log_dependency(dependee); 1943 return true; 1944 } 1945 } 1946 } 1947 } 1948 return false; 1949 } 1950 1951 // Called from mark_for_deoptimization, when dependee is invalidated. 1952 bool nmethod::is_dependent_on_method(Method* dependee) { 1953 for (Dependencies::DepStream deps(this); deps.next(); ) { 1954 if (deps.type() != Dependencies::evol_method) 1955 continue; 1956 Method* method = deps.method_argument(0); 1957 if (method == dependee) return true; 1958 } 1959 return false; 1960 } 1961 1962 1963 bool nmethod::is_patchable_at(address instr_addr) { 1964 assert(insts_contains(instr_addr), "wrong nmethod used"); 1965 if (is_zombie()) { 1966 // a zombie may never be patched 1967 return false; 1968 } 1969 return true; 1970 } 1971 1972 1973 address nmethod::continuation_for_implicit_exception(address pc) { 1974 // Exception happened outside inline-cache check code => we are inside 1975 // an active nmethod => use cpc to determine a return address 1976 int exception_offset = pc - code_begin(); 1977 int cont_offset = ImplicitExceptionTable(this).at( exception_offset ); 1978 #ifdef ASSERT 1979 if (cont_offset == 0) { 1980 Thread* thread = Thread::current(); 1981 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY 1982 HandleMark hm(thread); 1983 ResourceMark rm(thread); 1984 CodeBlob* cb = CodeCache::find_blob(pc); 1985 assert(cb != NULL && cb == this, ""); 1986 ttyLocker ttyl; 1987 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, p2i(pc)); 1988 print(); 1989 method()->print_codes(); 1990 print_code(); 1991 print_pcs(); 1992 } 1993 #endif 1994 if (cont_offset == 0) { 1995 // Let the normal error handling report the exception 1996 return NULL; 1997 } 1998 return code_begin() + cont_offset; 1999 } 2000 2001 2002 2003 void nmethod_init() { 2004 // make sure you didn't forget to adjust the filler fields 2005 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word"); 2006 } 2007 2008 2009 //------------------------------------------------------------------------------------------- 2010 2011 2012 // QQQ might we make this work from a frame?? 2013 nmethodLocker::nmethodLocker(address pc) { 2014 CodeBlob* cb = CodeCache::find_blob(pc); 2015 guarantee(cb != NULL && cb->is_compiled(), "bad pc for a nmethod found"); 2016 _nm = cb->as_compiled_method(); 2017 lock_nmethod(_nm); 2018 } 2019 2020 // Only JvmtiDeferredEvent::compiled_method_unload_event() 2021 // should pass zombie_ok == true. 2022 void nmethodLocker::lock_nmethod(CompiledMethod* cm, bool zombie_ok) { 2023 if (cm == NULL) return; 2024 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method 2025 nmethod* nm = cm->as_nmethod(); 2026 Atomic::inc(&nm->_lock_count); 2027 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method"); 2028 } 2029 2030 void nmethodLocker::unlock_nmethod(CompiledMethod* cm) { 2031 if (cm == NULL) return; 2032 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method 2033 nmethod* nm = cm->as_nmethod(); 2034 Atomic::dec(&nm->_lock_count); 2035 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock"); 2036 } 2037 2038 2039 // ----------------------------------------------------------------------------- 2040 // Verification 2041 2042 class VerifyOopsClosure: public OopClosure { 2043 nmethod* _nm; 2044 bool _ok; 2045 public: 2046 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { } 2047 bool ok() { return _ok; } 2048 virtual void do_oop(oop* p) { 2049 if (oopDesc::is_oop_or_null(*p)) return; 2050 if (_ok) { 2051 _nm->print_nmethod(true); 2052 _ok = false; 2053 } 2054 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)", 2055 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm)); 2056 } 2057 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2058 }; 2059 2060 void nmethod::verify() { 2061 2062 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant 2063 // seems odd. 2064 2065 if (is_zombie() || is_not_entrant() || is_unloaded()) 2066 return; 2067 2068 // Make sure all the entry points are correctly aligned for patching. 2069 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point()); 2070 2071 // assert(oopDesc::is_oop(method()), "must be valid"); 2072 2073 ResourceMark rm; 2074 2075 if (!CodeCache::contains(this)) { 2076 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this)); 2077 } 2078 2079 if(is_native_method() ) 2080 return; 2081 2082 nmethod* nm = CodeCache::find_nmethod(verified_entry_point()); 2083 if (nm != this) { 2084 fatal("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this)); 2085 } 2086 2087 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2088 if (! p->verify(this)) { 2089 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this)); 2090 } 2091 } 2092 2093 VerifyOopsClosure voc(this); 2094 oops_do(&voc); 2095 assert(voc.ok(), "embedded oops must be OK"); 2096 Universe::heap()->verify_nmethod(this); 2097 2098 verify_scopes(); 2099 } 2100 2101 2102 void nmethod::verify_interrupt_point(address call_site) { 2103 // Verify IC only when nmethod installation is finished. 2104 if (!is_not_installed()) { 2105 Thread *cur = Thread::current(); 2106 if (CompiledIC_lock->owner() == cur || 2107 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) && 2108 SafepointSynchronize::is_at_safepoint())) { 2109 CompiledIC_at(this, call_site); 2110 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); 2111 } else { 2112 MutexLocker ml_verify (CompiledIC_lock); 2113 CompiledIC_at(this, call_site); 2114 } 2115 } 2116 2117 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address()); 2118 assert(pd != NULL, "PcDesc must exist"); 2119 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(), 2120 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(), 2121 pd->return_oop()); 2122 !sd->is_top(); sd = sd->sender()) { 2123 sd->verify(); 2124 } 2125 } 2126 2127 void nmethod::verify_scopes() { 2128 if( !method() ) return; // Runtime stubs have no scope 2129 if (method()->is_native()) return; // Ignore stub methods. 2130 // iterate through all interrupt point 2131 // and verify the debug information is valid. 2132 RelocIterator iter((nmethod*)this); 2133 while (iter.next()) { 2134 address stub = NULL; 2135 switch (iter.type()) { 2136 case relocInfo::virtual_call_type: 2137 verify_interrupt_point(iter.addr()); 2138 break; 2139 case relocInfo::opt_virtual_call_type: 2140 stub = iter.opt_virtual_call_reloc()->static_stub(false); 2141 verify_interrupt_point(iter.addr()); 2142 break; 2143 case relocInfo::static_call_type: 2144 stub = iter.static_call_reloc()->static_stub(false); 2145 //verify_interrupt_point(iter.addr()); 2146 break; 2147 case relocInfo::runtime_call_type: 2148 case relocInfo::runtime_call_w_cp_type: { 2149 address destination = iter.reloc()->value(); 2150 // Right now there is no way to find out which entries support 2151 // an interrupt point. It would be nice if we had this 2152 // information in a table. 2153 break; 2154 } 2155 default: 2156 break; 2157 } 2158 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section"); 2159 } 2160 } 2161 2162 2163 // ----------------------------------------------------------------------------- 2164 // Non-product code 2165 #ifndef PRODUCT 2166 2167 class DebugScavengeRoot: public OopClosure { 2168 nmethod* _nm; 2169 bool _ok; 2170 public: 2171 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { } 2172 bool ok() { return _ok; } 2173 virtual void do_oop(oop* p) { 2174 if ((*p) == NULL || !Universe::heap()->is_scavengable(*p)) return; 2175 if (_ok) { 2176 _nm->print_nmethod(true); 2177 _ok = false; 2178 } 2179 tty->print_cr("*** scavengable oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)", 2180 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm)); 2181 (*p)->print(); 2182 } 2183 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2184 }; 2185 2186 void nmethod::verify_scavenge_root_oops() { 2187 if (!on_scavenge_root_list()) { 2188 // Actually look inside, to verify the claim that it's clean. 2189 DebugScavengeRoot debug_scavenge_root(this); 2190 oops_do(&debug_scavenge_root); 2191 if (!debug_scavenge_root.ok()) 2192 fatal("found an unadvertised bad scavengable oop in the code cache"); 2193 } 2194 assert(scavenge_root_not_marked(), ""); 2195 } 2196 2197 #endif // PRODUCT 2198 2199 // Printing operations 2200 2201 void nmethod::print() const { 2202 ResourceMark rm; 2203 ttyLocker ttyl; // keep the following output all in one block 2204 2205 tty->print("Compiled method "); 2206 2207 if (is_compiled_by_c1()) { 2208 tty->print("(c1) "); 2209 } else if (is_compiled_by_c2()) { 2210 tty->print("(c2) "); 2211 } else if (is_compiled_by_jvmci()) { 2212 tty->print("(JVMCI) "); 2213 } else { 2214 tty->print("(nm) "); 2215 } 2216 2217 print_on(tty, NULL); 2218 2219 if (WizardMode) { 2220 tty->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this)); 2221 tty->print(" for method " INTPTR_FORMAT , p2i(method())); 2222 tty->print(" { "); 2223 tty->print_cr("%s ", state()); 2224 if (on_scavenge_root_list()) tty->print("scavenge_root "); 2225 tty->print_cr("}:"); 2226 } 2227 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2228 p2i(this), 2229 p2i(this) + size(), 2230 size()); 2231 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2232 p2i(relocation_begin()), 2233 p2i(relocation_end()), 2234 relocation_size()); 2235 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2236 p2i(consts_begin()), 2237 p2i(consts_end()), 2238 consts_size()); 2239 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2240 p2i(insts_begin()), 2241 p2i(insts_end()), 2242 insts_size()); 2243 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2244 p2i(stub_begin()), 2245 p2i(stub_end()), 2246 stub_size()); 2247 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2248 p2i(oops_begin()), 2249 p2i(oops_end()), 2250 oops_size()); 2251 if (metadata_size () > 0) tty->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2252 p2i(metadata_begin()), 2253 p2i(metadata_end()), 2254 metadata_size()); 2255 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2256 p2i(scopes_data_begin()), 2257 p2i(scopes_data_end()), 2258 scopes_data_size()); 2259 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2260 p2i(scopes_pcs_begin()), 2261 p2i(scopes_pcs_end()), 2262 scopes_pcs_size()); 2263 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2264 p2i(dependencies_begin()), 2265 p2i(dependencies_end()), 2266 dependencies_size()); 2267 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2268 p2i(handler_table_begin()), 2269 p2i(handler_table_end()), 2270 handler_table_size()); 2271 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2272 p2i(nul_chk_table_begin()), 2273 p2i(nul_chk_table_end()), 2274 nul_chk_table_size()); 2275 } 2276 2277 #ifndef PRODUCT 2278 2279 void nmethod::print_scopes() { 2280 // Find the first pc desc for all scopes in the code and print it. 2281 ResourceMark rm; 2282 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2283 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null) 2284 continue; 2285 2286 ScopeDesc* sd = scope_desc_at(p->real_pc(this)); 2287 while (sd != NULL) { 2288 sd->print_on(tty, p); 2289 sd = sd->sender(); 2290 } 2291 } 2292 } 2293 2294 void nmethod::print_dependencies() { 2295 ResourceMark rm; 2296 ttyLocker ttyl; // keep the following output all in one block 2297 tty->print_cr("Dependencies:"); 2298 for (Dependencies::DepStream deps(this); deps.next(); ) { 2299 deps.print_dependency(); 2300 Klass* ctxk = deps.context_type(); 2301 if (ctxk != NULL) { 2302 if (ctxk->is_instance_klass() && InstanceKlass::cast(ctxk)->is_dependent_nmethod(this)) { 2303 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name()); 2304 } 2305 } 2306 deps.log_dependency(); // put it into the xml log also 2307 } 2308 } 2309 2310 2311 void nmethod::print_relocations() { 2312 ResourceMark m; // in case methods get printed via the debugger 2313 tty->print_cr("relocations:"); 2314 RelocIterator iter(this); 2315 iter.print(); 2316 } 2317 2318 2319 void nmethod::print_pcs() { 2320 ResourceMark m; // in case methods get printed via debugger 2321 tty->print_cr("pc-bytecode offsets:"); 2322 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2323 p->print(this); 2324 } 2325 } 2326 2327 void nmethod::print_recorded_oops() { 2328 tty->print_cr("Recorded oops:"); 2329 for (int i = 0; i < oops_count(); i++) { 2330 oop o = oop_at(i); 2331 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(o)); 2332 if (o == (oop)Universe::non_oop_word()) { 2333 tty->print("non-oop word"); 2334 } else { 2335 if (o != NULL) { 2336 o->print_value(); 2337 } else { 2338 tty->print_cr("NULL"); 2339 } 2340 } 2341 tty->cr(); 2342 } 2343 } 2344 2345 void nmethod::print_recorded_metadata() { 2346 tty->print_cr("Recorded metadata:"); 2347 for (int i = 0; i < metadata_count(); i++) { 2348 Metadata* m = metadata_at(i); 2349 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(m)); 2350 if (m == (Metadata*)Universe::non_oop_word()) { 2351 tty->print("non-metadata word"); 2352 } else { 2353 m->print_value_on_maybe_null(tty); 2354 } 2355 tty->cr(); 2356 } 2357 } 2358 2359 #endif // PRODUCT 2360 2361 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) { 2362 RelocIterator iter(this, begin, end); 2363 bool have_one = false; 2364 while (iter.next()) { 2365 have_one = true; 2366 switch (iter.type()) { 2367 case relocInfo::none: return "no_reloc"; 2368 case relocInfo::oop_type: { 2369 stringStream st; 2370 oop_Relocation* r = iter.oop_reloc(); 2371 oop obj = r->oop_value(); 2372 st.print("oop("); 2373 if (obj == NULL) st.print("NULL"); 2374 else obj->print_value_on(&st); 2375 st.print(")"); 2376 return st.as_string(); 2377 } 2378 case relocInfo::metadata_type: { 2379 stringStream st; 2380 metadata_Relocation* r = iter.metadata_reloc(); 2381 Metadata* obj = r->metadata_value(); 2382 st.print("metadata("); 2383 if (obj == NULL) st.print("NULL"); 2384 else obj->print_value_on(&st); 2385 st.print(")"); 2386 return st.as_string(); 2387 } 2388 case relocInfo::runtime_call_type: 2389 case relocInfo::runtime_call_w_cp_type: { 2390 stringStream st; 2391 st.print("runtime_call"); 2392 CallRelocation* r = (CallRelocation*)iter.reloc(); 2393 address dest = r->destination(); 2394 CodeBlob* cb = CodeCache::find_blob(dest); 2395 if (cb != NULL) { 2396 st.print(" %s", cb->name()); 2397 } else { 2398 ResourceMark rm; 2399 const int buflen = 1024; 2400 char* buf = NEW_RESOURCE_ARRAY(char, buflen); 2401 int offset; 2402 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) { 2403 st.print(" %s", buf); 2404 if (offset != 0) { 2405 st.print("+%d", offset); 2406 } 2407 } 2408 } 2409 return st.as_string(); 2410 } 2411 case relocInfo::virtual_call_type: { 2412 stringStream st; 2413 st.print_raw("virtual_call"); 2414 virtual_call_Relocation* r = iter.virtual_call_reloc(); 2415 Method* m = r->method_value(); 2416 if (m != NULL) { 2417 assert(m->is_method(), ""); 2418 m->print_short_name(&st); 2419 } 2420 return st.as_string(); 2421 } 2422 case relocInfo::opt_virtual_call_type: { 2423 stringStream st; 2424 st.print_raw("optimized virtual_call"); 2425 opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc(); 2426 Method* m = r->method_value(); 2427 if (m != NULL) { 2428 assert(m->is_method(), ""); 2429 m->print_short_name(&st); 2430 } 2431 return st.as_string(); 2432 } 2433 case relocInfo::static_call_type: { 2434 stringStream st; 2435 st.print_raw("static_call"); 2436 static_call_Relocation* r = iter.static_call_reloc(); 2437 Method* m = r->method_value(); 2438 if (m != NULL) { 2439 assert(m->is_method(), ""); 2440 m->print_short_name(&st); 2441 } 2442 return st.as_string(); 2443 } 2444 case relocInfo::static_stub_type: return "static_stub"; 2445 case relocInfo::external_word_type: return "external_word"; 2446 case relocInfo::internal_word_type: return "internal_word"; 2447 case relocInfo::section_word_type: return "section_word"; 2448 case relocInfo::poll_type: return "poll"; 2449 case relocInfo::poll_return_type: return "poll_return"; 2450 case relocInfo::type_mask: return "type_bit_mask"; 2451 2452 default: 2453 break; 2454 } 2455 } 2456 return have_one ? "other" : NULL; 2457 } 2458 2459 // Return a the last scope in (begin..end] 2460 ScopeDesc* nmethod::scope_desc_in(address begin, address end) { 2461 PcDesc* p = pc_desc_near(begin+1); 2462 if (p != NULL && p->real_pc(this) <= end) { 2463 return new ScopeDesc(this, p->scope_decode_offset(), 2464 p->obj_decode_offset(), p->should_reexecute(), p->rethrow_exception(), 2465 p->return_oop()); 2466 } 2467 return NULL; 2468 } 2469 2470 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const { 2471 if (block_begin == entry_point()) stream->print_cr("[Entry Point]"); 2472 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]"); 2473 if (JVMCI_ONLY(_exception_offset >= 0 &&) block_begin == exception_begin()) stream->print_cr("[Exception Handler]"); 2474 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]"); 2475 if (JVMCI_ONLY(_deopt_handler_begin != NULL &&) block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]"); 2476 2477 if (has_method_handle_invokes()) 2478 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]"); 2479 2480 if (block_begin == consts_begin()) stream->print_cr("[Constants]"); 2481 2482 if (block_begin == entry_point()) { 2483 methodHandle m = method(); 2484 if (m.not_null()) { 2485 stream->print(" # "); 2486 m->print_value_on(stream); 2487 stream->cr(); 2488 } 2489 if (m.not_null() && !is_osr_method()) { 2490 ResourceMark rm; 2491 int sizeargs = m->size_of_parameters(); 2492 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs); 2493 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs); 2494 { 2495 int sig_index = 0; 2496 if (!m->is_static()) 2497 sig_bt[sig_index++] = T_OBJECT; // 'this' 2498 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) { 2499 BasicType t = ss.type(); 2500 sig_bt[sig_index++] = t; 2501 if (type2size[t] == 2) { 2502 sig_bt[sig_index++] = T_VOID; 2503 } else { 2504 assert(type2size[t] == 1, "size is 1 or 2"); 2505 } 2506 } 2507 assert(sig_index == sizeargs, ""); 2508 } 2509 const char* spname = "sp"; // make arch-specific? 2510 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false); 2511 int stack_slot_offset = this->frame_size() * wordSize; 2512 int tab1 = 14, tab2 = 24; 2513 int sig_index = 0; 2514 int arg_index = (m->is_static() ? 0 : -1); 2515 bool did_old_sp = false; 2516 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) { 2517 bool at_this = (arg_index == -1); 2518 bool at_old_sp = false; 2519 BasicType t = (at_this ? T_OBJECT : ss.type()); 2520 assert(t == sig_bt[sig_index], "sigs in sync"); 2521 if (at_this) 2522 stream->print(" # this: "); 2523 else 2524 stream->print(" # parm%d: ", arg_index); 2525 stream->move_to(tab1); 2526 VMReg fst = regs[sig_index].first(); 2527 VMReg snd = regs[sig_index].second(); 2528 if (fst->is_reg()) { 2529 stream->print("%s", fst->name()); 2530 if (snd->is_valid()) { 2531 stream->print(":%s", snd->name()); 2532 } 2533 } else if (fst->is_stack()) { 2534 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset; 2535 if (offset == stack_slot_offset) at_old_sp = true; 2536 stream->print("[%s+0x%x]", spname, offset); 2537 } else { 2538 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd); 2539 } 2540 stream->print(" "); 2541 stream->move_to(tab2); 2542 stream->print("= "); 2543 if (at_this) { 2544 m->method_holder()->print_value_on(stream); 2545 } else { 2546 bool did_name = false; 2547 if (!at_this && ss.is_object()) { 2548 Symbol* name = ss.as_symbol_or_null(); 2549 if (name != NULL) { 2550 name->print_value_on(stream); 2551 did_name = true; 2552 } 2553 } 2554 if (!did_name) 2555 stream->print("%s", type2name(t)); 2556 } 2557 if (at_old_sp) { 2558 stream->print(" (%s of caller)", spname); 2559 did_old_sp = true; 2560 } 2561 stream->cr(); 2562 sig_index += type2size[t]; 2563 arg_index += 1; 2564 if (!at_this) ss.next(); 2565 } 2566 if (!did_old_sp) { 2567 stream->print(" # "); 2568 stream->move_to(tab1); 2569 stream->print("[%s+0x%x]", spname, stack_slot_offset); 2570 stream->print(" (%s of caller)", spname); 2571 stream->cr(); 2572 } 2573 } 2574 } 2575 } 2576 2577 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) { 2578 // First, find an oopmap in (begin, end]. 2579 // We use the odd half-closed interval so that oop maps and scope descs 2580 // which are tied to the byte after a call are printed with the call itself. 2581 address base = code_begin(); 2582 ImmutableOopMapSet* oms = oop_maps(); 2583 if (oms != NULL) { 2584 for (int i = 0, imax = oms->count(); i < imax; i++) { 2585 const ImmutableOopMapPair* pair = oms->pair_at(i); 2586 const ImmutableOopMap* om = pair->get_from(oms); 2587 address pc = base + pair->pc_offset(); 2588 if (pc > begin) { 2589 if (pc <= end) { 2590 st->move_to(column); 2591 st->print("; "); 2592 om->print_on(st); 2593 } 2594 break; 2595 } 2596 } 2597 } 2598 2599 // Print any debug info present at this pc. 2600 ScopeDesc* sd = scope_desc_in(begin, end); 2601 if (sd != NULL) { 2602 st->move_to(column); 2603 if (sd->bci() == SynchronizationEntryBCI) { 2604 st->print(";*synchronization entry"); 2605 } else if (sd->bci() == AfterBci) { 2606 st->print(";* method exit (unlocked if synchronized)"); 2607 } else if (sd->bci() == UnwindBci) { 2608 st->print(";* unwind (locked if synchronized)"); 2609 } else if (sd->bci() == AfterExceptionBci) { 2610 st->print(";* unwind (unlocked if synchronized)"); 2611 } else if (sd->bci() == UnknownBci) { 2612 st->print(";* unknown"); 2613 } else if (sd->bci() == InvalidFrameStateBci) { 2614 st->print(";* invalid frame state"); 2615 } else { 2616 if (sd->method() == NULL) { 2617 st->print("method is NULL"); 2618 } else if (sd->method()->is_native()) { 2619 st->print("method is native"); 2620 } else { 2621 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci()); 2622 st->print(";*%s", Bytecodes::name(bc)); 2623 switch (bc) { 2624 case Bytecodes::_invokevirtual: 2625 case Bytecodes::_invokespecial: 2626 case Bytecodes::_invokestatic: 2627 case Bytecodes::_invokeinterface: 2628 { 2629 Bytecode_invoke invoke(sd->method(), sd->bci()); 2630 st->print(" "); 2631 if (invoke.name() != NULL) 2632 invoke.name()->print_symbol_on(st); 2633 else 2634 st->print("<UNKNOWN>"); 2635 break; 2636 } 2637 case Bytecodes::_getfield: 2638 case Bytecodes::_putfield: 2639 case Bytecodes::_getstatic: 2640 case Bytecodes::_putstatic: 2641 { 2642 Bytecode_field field(sd->method(), sd->bci()); 2643 st->print(" "); 2644 if (field.name() != NULL) 2645 field.name()->print_symbol_on(st); 2646 else 2647 st->print("<UNKNOWN>"); 2648 } 2649 default: 2650 break; 2651 } 2652 } 2653 st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop()); 2654 } 2655 2656 // Print all scopes 2657 for (;sd != NULL; sd = sd->sender()) { 2658 st->move_to(column); 2659 st->print("; -"); 2660 if (sd->method() == NULL) { 2661 st->print("method is NULL"); 2662 } else { 2663 sd->method()->print_short_name(st); 2664 } 2665 int lineno = sd->method()->line_number_from_bci(sd->bci()); 2666 if (lineno != -1) { 2667 st->print("@%d (line %d)", sd->bci(), lineno); 2668 } else { 2669 st->print("@%d", sd->bci()); 2670 } 2671 st->cr(); 2672 } 2673 } 2674 2675 // Print relocation information 2676 const char* str = reloc_string_for(begin, end); 2677 if (str != NULL) { 2678 if (sd != NULL) st->cr(); 2679 st->move_to(column); 2680 st->print("; {%s}", str); 2681 } 2682 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin()); 2683 if (cont_offset != 0) { 2684 st->move_to(column); 2685 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset)); 2686 } 2687 2688 } 2689 2690 class DirectNativeCallWrapper: public NativeCallWrapper { 2691 private: 2692 NativeCall* _call; 2693 2694 public: 2695 DirectNativeCallWrapper(NativeCall* call) : _call(call) {} 2696 2697 virtual address destination() const { return _call->destination(); } 2698 virtual address instruction_address() const { return _call->instruction_address(); } 2699 virtual address next_instruction_address() const { return _call->next_instruction_address(); } 2700 virtual address return_address() const { return _call->return_address(); } 2701 2702 virtual address get_resolve_call_stub(bool is_optimized) const { 2703 if (is_optimized) { 2704 return SharedRuntime::get_resolve_opt_virtual_call_stub(); 2705 } 2706 return SharedRuntime::get_resolve_virtual_call_stub(); 2707 } 2708 2709 virtual void set_destination_mt_safe(address dest) { 2710 #if INCLUDE_AOT 2711 if (UseAOT) { 2712 CodeBlob* callee = CodeCache::find_blob(dest); 2713 CompiledMethod* cm = callee->as_compiled_method_or_null(); 2714 if (cm != NULL && cm->is_far_code()) { 2715 // Temporary fix, see JDK-8143106 2716 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address()); 2717 csc->set_to_far(methodHandle(cm->method()), dest); 2718 return; 2719 } 2720 } 2721 #endif 2722 _call->set_destination_mt_safe(dest); 2723 } 2724 2725 virtual void set_to_interpreted(const methodHandle& method, CompiledICInfo& info) { 2726 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address()); 2727 #if INCLUDE_AOT 2728 if (info.to_aot()) { 2729 csc->set_to_far(method, info.entry()); 2730 } else 2731 #endif 2732 { 2733 csc->set_to_interpreted(method, info.entry()); 2734 } 2735 } 2736 2737 virtual void verify() const { 2738 // make sure code pattern is actually a call imm32 instruction 2739 _call->verify(); 2740 if (os::is_MP()) { 2741 _call->verify_alignment(); 2742 } 2743 } 2744 2745 virtual void verify_resolve_call(address dest) const { 2746 CodeBlob* db = CodeCache::find_blob_unsafe(dest); 2747 assert(db != NULL && !db->is_adapter_blob(), "must use stub!"); 2748 } 2749 2750 virtual bool is_call_to_interpreted(address dest) const { 2751 CodeBlob* cb = CodeCache::find_blob(_call->instruction_address()); 2752 return cb->contains(dest); 2753 } 2754 2755 virtual bool is_safe_for_patching() const { return false; } 2756 2757 virtual NativeInstruction* get_load_instruction(virtual_call_Relocation* r) const { 2758 return nativeMovConstReg_at(r->cached_value()); 2759 } 2760 2761 virtual void *get_data(NativeInstruction* instruction) const { 2762 return (void*)((NativeMovConstReg*) instruction)->data(); 2763 } 2764 2765 virtual void set_data(NativeInstruction* instruction, intptr_t data) { 2766 ((NativeMovConstReg*) instruction)->set_data(data); 2767 } 2768 }; 2769 2770 NativeCallWrapper* nmethod::call_wrapper_at(address call) const { 2771 return new DirectNativeCallWrapper((NativeCall*) call); 2772 } 2773 2774 NativeCallWrapper* nmethod::call_wrapper_before(address return_pc) const { 2775 return new DirectNativeCallWrapper(nativeCall_before(return_pc)); 2776 } 2777 2778 address nmethod::call_instruction_address(address pc) const { 2779 if (NativeCall::is_call_before(pc)) { 2780 NativeCall *ncall = nativeCall_before(pc); 2781 return ncall->instruction_address(); 2782 } 2783 return NULL; 2784 } 2785 2786 CompiledStaticCall* nmethod::compiledStaticCall_at(Relocation* call_site) const { 2787 return CompiledDirectStaticCall::at(call_site); 2788 } 2789 2790 CompiledStaticCall* nmethod::compiledStaticCall_at(address call_site) const { 2791 return CompiledDirectStaticCall::at(call_site); 2792 } 2793 2794 CompiledStaticCall* nmethod::compiledStaticCall_before(address return_addr) const { 2795 return CompiledDirectStaticCall::before(return_addr); 2796 } 2797 2798 #ifndef PRODUCT 2799 2800 void nmethod::print_value_on(outputStream* st) const { 2801 st->print("nmethod"); 2802 print_on(st, NULL); 2803 } 2804 2805 void nmethod::print_calls(outputStream* st) { 2806 RelocIterator iter(this); 2807 while (iter.next()) { 2808 switch (iter.type()) { 2809 case relocInfo::virtual_call_type: 2810 case relocInfo::opt_virtual_call_type: { 2811 VerifyMutexLocker mc(CompiledIC_lock); 2812 CompiledIC_at(&iter)->print(); 2813 break; 2814 } 2815 case relocInfo::static_call_type: 2816 st->print_cr("Static call at " INTPTR_FORMAT, p2i(iter.reloc()->addr())); 2817 CompiledDirectStaticCall::at(iter.reloc())->print(); 2818 break; 2819 default: 2820 break; 2821 } 2822 } 2823 } 2824 2825 void nmethod::print_handler_table() { 2826 ExceptionHandlerTable(this).print(); 2827 } 2828 2829 void nmethod::print_nul_chk_table() { 2830 ImplicitExceptionTable(this).print(code_begin()); 2831 } 2832 2833 void nmethod::print_statistics() { 2834 ttyLocker ttyl; 2835 if (xtty != NULL) xtty->head("statistics type='nmethod'"); 2836 native_nmethod_stats.print_native_nmethod_stats(); 2837 #ifdef COMPILER1 2838 c1_java_nmethod_stats.print_nmethod_stats("C1"); 2839 #endif 2840 #ifdef COMPILER2 2841 c2_java_nmethod_stats.print_nmethod_stats("C2"); 2842 #endif 2843 #if INCLUDE_JVMCI 2844 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI"); 2845 #endif 2846 unknown_java_nmethod_stats.print_nmethod_stats("Unknown"); 2847 DebugInformationRecorder::print_statistics(); 2848 #ifndef PRODUCT 2849 pc_nmethod_stats.print_pc_stats(); 2850 #endif 2851 Dependencies::print_statistics(); 2852 if (xtty != NULL) xtty->tail("statistics"); 2853 } 2854 2855 #endif // !PRODUCT 2856 2857 #if INCLUDE_JVMCI 2858 void nmethod::clear_jvmci_installed_code() { 2859 assert_locked_or_safepoint(Patching_lock); 2860 if (_jvmci_installed_code != NULL) { 2861 JNIHandles::destroy_weak_global(_jvmci_installed_code); 2862 _jvmci_installed_code = NULL; 2863 } 2864 } 2865 2866 void nmethod::clear_speculation_log() { 2867 assert_locked_or_safepoint(Patching_lock); 2868 if (_speculation_log != NULL) { 2869 JNIHandles::destroy_weak_global(_speculation_log); 2870 _speculation_log = NULL; 2871 } 2872 } 2873 2874 void nmethod::maybe_invalidate_installed_code() { 2875 assert(Patching_lock->is_locked() || 2876 SafepointSynchronize::is_at_safepoint(), "should be performed under a lock for consistency"); 2877 oop installed_code = JNIHandles::resolve(_jvmci_installed_code); 2878 if (installed_code != NULL) { 2879 // Update the values in the InstalledCode instance if it still refers to this nmethod 2880 nmethod* nm = (nmethod*)InstalledCode::address(installed_code); 2881 if (nm == this) { 2882 if (!is_alive()) { 2883 // Break the link between nmethod and InstalledCode such that the nmethod 2884 // can subsequently be flushed safely. The link must be maintained while 2885 // the method could have live activations since invalidateInstalledCode 2886 // might want to invalidate all existing activations. 2887 InstalledCode::set_address(installed_code, 0); 2888 InstalledCode::set_entryPoint(installed_code, 0); 2889 } else if (is_not_entrant()) { 2890 // Remove the entry point so any invocation will fail but keep 2891 // the address link around that so that existing activations can 2892 // be invalidated. 2893 InstalledCode::set_entryPoint(installed_code, 0); 2894 } 2895 } 2896 } 2897 if (!is_alive()) { 2898 // Clear these out after the nmethod has been unregistered and any 2899 // updates to the InstalledCode instance have been performed. 2900 clear_jvmci_installed_code(); 2901 clear_speculation_log(); 2902 } 2903 } 2904 2905 void nmethod::invalidate_installed_code(Handle installedCode, TRAPS) { 2906 if (installedCode() == NULL) { 2907 THROW(vmSymbols::java_lang_NullPointerException()); 2908 } 2909 jlong nativeMethod = InstalledCode::address(installedCode); 2910 nmethod* nm = (nmethod*)nativeMethod; 2911 if (nm == NULL) { 2912 // Nothing to do 2913 return; 2914 } 2915 2916 nmethodLocker nml(nm); 2917 #ifdef ASSERT 2918 { 2919 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 2920 // This relationship can only be checked safely under a lock 2921 assert(!nm->is_alive() || nm->jvmci_installed_code() == installedCode(), "sanity check"); 2922 } 2923 #endif 2924 2925 if (nm->is_alive()) { 2926 // Invalidating the InstalledCode means we want the nmethod 2927 // to be deoptimized. 2928 nm->mark_for_deoptimization(); 2929 VM_Deoptimize op; 2930 VMThread::execute(&op); 2931 } 2932 2933 // Multiple threads could reach this point so we now need to 2934 // lock and re-check the link to the nmethod so that only one 2935 // thread clears it. 2936 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 2937 if (InstalledCode::address(installedCode) == nativeMethod) { 2938 InstalledCode::set_address(installedCode, 0); 2939 } 2940 } 2941 2942 oop nmethod::jvmci_installed_code() { 2943 return JNIHandles::resolve(_jvmci_installed_code); 2944 } 2945 2946 oop nmethod::speculation_log() { 2947 return JNIHandles::resolve(_speculation_log); 2948 } 2949 2950 char* nmethod::jvmci_installed_code_name(char* buf, size_t buflen) { 2951 if (!this->is_compiled_by_jvmci()) { 2952 return NULL; 2953 } 2954 oop installed_code = JNIHandles::resolve(_jvmci_installed_code); 2955 if (installed_code != NULL) { 2956 oop installed_code_name = NULL; 2957 if (installed_code->is_a(InstalledCode::klass())) { 2958 installed_code_name = InstalledCode::name(installed_code); 2959 } 2960 if (installed_code_name != NULL) { 2961 return java_lang_String::as_utf8_string(installed_code_name, buf, (int)buflen); 2962 } 2963 } 2964 return NULL; 2965 } 2966 #endif