1 /* 2 * Copyright (c) 1997, 2019, 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 "asm/assembler.inline.hpp" 28 #include "code/codeCache.hpp" 29 #include "code/compiledIC.hpp" 30 #include "code/compiledMethod.inline.hpp" 31 #include "code/dependencies.hpp" 32 #include "code/nativeInst.hpp" 33 #include "code/nmethod.hpp" 34 #include "code/scopeDesc.hpp" 35 #include "compiler/abstractCompiler.hpp" 36 #include "compiler/compileBroker.hpp" 37 #include "compiler/compileLog.hpp" 38 #include "compiler/compilerDirectives.hpp" 39 #include "compiler/directivesParser.hpp" 40 #include "compiler/disassembler.hpp" 41 #include "interpreter/bytecode.hpp" 42 #include "logging/log.hpp" 43 #include "logging/logStream.hpp" 44 #include "memory/allocation.inline.hpp" 45 #include "memory/resourceArea.hpp" 46 #include "memory/universe.hpp" 47 #include "oops/access.inline.hpp" 48 #include "oops/method.inline.hpp" 49 #include "oops/methodData.hpp" 50 #include "oops/oop.inline.hpp" 51 #include "prims/jvmtiImpl.hpp" 52 #include "runtime/atomic.hpp" 53 #include "runtime/flags/flagSetting.hpp" 54 #include "runtime/frame.inline.hpp" 55 #include "runtime/handles.inline.hpp" 56 #include "runtime/jniHandles.inline.hpp" 57 #include "runtime/orderAccess.hpp" 58 #include "runtime/os.hpp" 59 #include "runtime/safepointVerifiers.hpp" 60 #include "runtime/sharedRuntime.hpp" 61 #include "runtime/sweeper.hpp" 62 #include "runtime/vmThread.hpp" 63 #include "utilities/align.hpp" 64 #include "utilities/dtrace.hpp" 65 #include "utilities/events.hpp" 66 #include "utilities/resourceHash.hpp" 67 #include "utilities/xmlstream.hpp" 68 #if INCLUDE_JVMCI 69 #include "jvmci/jvmciRuntime.hpp" 70 #endif 71 72 #ifdef DTRACE_ENABLED 73 74 // Only bother with this argument setup if dtrace is available 75 76 #define DTRACE_METHOD_UNLOAD_PROBE(method) \ 77 { \ 78 Method* m = (method); \ 79 if (m != NULL) { \ 80 Symbol* klass_name = m->klass_name(); \ 81 Symbol* name = m->name(); \ 82 Symbol* signature = m->signature(); \ 83 HOTSPOT_COMPILED_METHOD_UNLOAD( \ 84 (char *) klass_name->bytes(), klass_name->utf8_length(), \ 85 (char *) name->bytes(), name->utf8_length(), \ 86 (char *) signature->bytes(), signature->utf8_length()); \ 87 } \ 88 } 89 90 #else // ndef DTRACE_ENABLED 91 92 #define DTRACE_METHOD_UNLOAD_PROBE(method) 93 94 #endif 95 96 //--------------------------------------------------------------------------------- 97 // NMethod statistics 98 // They are printed under various flags, including: 99 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation. 100 // (In the latter two cases, they like other stats are printed to the log only.) 101 102 #ifndef PRODUCT 103 // These variables are put into one block to reduce relocations 104 // and make it simpler to print from the debugger. 105 struct java_nmethod_stats_struct { 106 int nmethod_count; 107 int total_size; 108 int relocation_size; 109 int consts_size; 110 int insts_size; 111 int stub_size; 112 int scopes_data_size; 113 int scopes_pcs_size; 114 int dependencies_size; 115 int handler_table_size; 116 int nul_chk_table_size; 117 #if INCLUDE_JVMCI 118 int speculations_size; 119 int jvmci_data_size; 120 #endif 121 int oops_size; 122 int metadata_size; 123 124 void note_nmethod(nmethod* nm) { 125 nmethod_count += 1; 126 total_size += nm->size(); 127 relocation_size += nm->relocation_size(); 128 consts_size += nm->consts_size(); 129 insts_size += nm->insts_size(); 130 stub_size += nm->stub_size(); 131 oops_size += nm->oops_size(); 132 metadata_size += nm->metadata_size(); 133 scopes_data_size += nm->scopes_data_size(); 134 scopes_pcs_size += nm->scopes_pcs_size(); 135 dependencies_size += nm->dependencies_size(); 136 handler_table_size += nm->handler_table_size(); 137 nul_chk_table_size += nm->nul_chk_table_size(); 138 #if INCLUDE_JVMCI 139 speculations_size += nm->speculations_size(); 140 jvmci_data_size += nm->jvmci_data_size(); 141 #endif 142 } 143 void print_nmethod_stats(const char* name) { 144 if (nmethod_count == 0) return; 145 tty->print_cr("Statistics for %d bytecoded nmethods for %s:", nmethod_count, name); 146 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size); 147 if (nmethod_count != 0) tty->print_cr(" header = " SIZE_FORMAT, nmethod_count * sizeof(nmethod)); 148 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size); 149 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size); 150 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size); 151 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size); 152 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size); 153 if (metadata_size != 0) tty->print_cr(" metadata = %d", metadata_size); 154 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size); 155 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size); 156 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size); 157 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size); 158 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size); 159 #if INCLUDE_JVMCI 160 if (speculations_size != 0) tty->print_cr(" speculations = %d", speculations_size); 161 if (jvmci_data_size != 0) tty->print_cr(" JVMCI data = %d", jvmci_data_size); 162 #endif 163 } 164 }; 165 166 struct native_nmethod_stats_struct { 167 int native_nmethod_count; 168 int native_total_size; 169 int native_relocation_size; 170 int native_insts_size; 171 int native_oops_size; 172 int native_metadata_size; 173 void note_native_nmethod(nmethod* nm) { 174 native_nmethod_count += 1; 175 native_total_size += nm->size(); 176 native_relocation_size += nm->relocation_size(); 177 native_insts_size += nm->insts_size(); 178 native_oops_size += nm->oops_size(); 179 native_metadata_size += nm->metadata_size(); 180 } 181 void print_native_nmethod_stats() { 182 if (native_nmethod_count == 0) return; 183 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count); 184 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size); 185 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size); 186 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size); 187 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size); 188 if (native_metadata_size != 0) tty->print_cr(" N. metadata = %d", native_metadata_size); 189 } 190 }; 191 192 struct pc_nmethod_stats_struct { 193 int pc_desc_resets; // number of resets (= number of caches) 194 int pc_desc_queries; // queries to nmethod::find_pc_desc 195 int pc_desc_approx; // number of those which have approximate true 196 int pc_desc_repeats; // number of _pc_descs[0] hits 197 int pc_desc_hits; // number of LRU cache hits 198 int pc_desc_tests; // total number of PcDesc examinations 199 int pc_desc_searches; // total number of quasi-binary search steps 200 int pc_desc_adds; // number of LUR cache insertions 201 202 void print_pc_stats() { 203 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query", 204 pc_desc_queries, 205 (double)(pc_desc_tests + pc_desc_searches) 206 / pc_desc_queries); 207 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d", 208 pc_desc_resets, 209 pc_desc_queries, pc_desc_approx, 210 pc_desc_repeats, pc_desc_hits, 211 pc_desc_tests, pc_desc_searches, pc_desc_adds); 212 } 213 }; 214 215 #ifdef COMPILER1 216 static java_nmethod_stats_struct c1_java_nmethod_stats; 217 #endif 218 #ifdef COMPILER2 219 static java_nmethod_stats_struct c2_java_nmethod_stats; 220 #endif 221 #if INCLUDE_JVMCI 222 static java_nmethod_stats_struct jvmci_java_nmethod_stats; 223 #endif 224 static java_nmethod_stats_struct unknown_java_nmethod_stats; 225 226 static native_nmethod_stats_struct native_nmethod_stats; 227 static pc_nmethod_stats_struct pc_nmethod_stats; 228 229 static void note_java_nmethod(nmethod* nm) { 230 #ifdef COMPILER1 231 if (nm->is_compiled_by_c1()) { 232 c1_java_nmethod_stats.note_nmethod(nm); 233 } else 234 #endif 235 #ifdef COMPILER2 236 if (nm->is_compiled_by_c2()) { 237 c2_java_nmethod_stats.note_nmethod(nm); 238 } else 239 #endif 240 #if INCLUDE_JVMCI 241 if (nm->is_compiled_by_jvmci()) { 242 jvmci_java_nmethod_stats.note_nmethod(nm); 243 } else 244 #endif 245 { 246 unknown_java_nmethod_stats.note_nmethod(nm); 247 } 248 } 249 #endif // !PRODUCT 250 251 //--------------------------------------------------------------------------------- 252 253 254 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) { 255 assert(pc != NULL, "Must be non null"); 256 assert(exception.not_null(), "Must be non null"); 257 assert(handler != NULL, "Must be non null"); 258 259 _count = 0; 260 _exception_type = exception->klass(); 261 _next = NULL; 262 _purge_list_next = NULL; 263 264 add_address_and_handler(pc,handler); 265 } 266 267 268 address ExceptionCache::match(Handle exception, address pc) { 269 assert(pc != NULL,"Must be non null"); 270 assert(exception.not_null(),"Must be non null"); 271 if (exception->klass() == exception_type()) { 272 return (test_address(pc)); 273 } 274 275 return NULL; 276 } 277 278 279 bool ExceptionCache::match_exception_with_space(Handle exception) { 280 assert(exception.not_null(),"Must be non null"); 281 if (exception->klass() == exception_type() && count() < cache_size) { 282 return true; 283 } 284 return false; 285 } 286 287 288 address ExceptionCache::test_address(address addr) { 289 int limit = count(); 290 for (int i = 0; i < limit; i++) { 291 if (pc_at(i) == addr) { 292 return handler_at(i); 293 } 294 } 295 return NULL; 296 } 297 298 299 bool ExceptionCache::add_address_and_handler(address addr, address handler) { 300 if (test_address(addr) == handler) return true; 301 302 int index = count(); 303 if (index < cache_size) { 304 set_pc_at(index, addr); 305 set_handler_at(index, handler); 306 increment_count(); 307 return true; 308 } 309 return false; 310 } 311 312 ExceptionCache* ExceptionCache::next() { 313 return Atomic::load(&_next); 314 } 315 316 void ExceptionCache::set_next(ExceptionCache *ec) { 317 Atomic::store(ec, &_next); 318 } 319 320 //----------------------------------------------------------------------------- 321 322 323 // Helper used by both find_pc_desc methods. 324 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) { 325 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_tests); 326 if (!approximate) 327 return pc->pc_offset() == pc_offset; 328 else 329 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset(); 330 } 331 332 void PcDescCache::reset_to(PcDesc* initial_pc_desc) { 333 if (initial_pc_desc == NULL) { 334 _pc_descs[0] = NULL; // native method; no PcDescs at all 335 return; 336 } 337 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_resets); 338 // reset the cache by filling it with benign (non-null) values 339 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel"); 340 for (int i = 0; i < cache_size; i++) 341 _pc_descs[i] = initial_pc_desc; 342 } 343 344 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) { 345 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_queries); 346 NOT_PRODUCT(if (approximate) ++pc_nmethod_stats.pc_desc_approx); 347 348 // Note: one might think that caching the most recently 349 // read value separately would be a win, but one would be 350 // wrong. When many threads are updating it, the cache 351 // line it's in would bounce between caches, negating 352 // any benefit. 353 354 // In order to prevent race conditions do not load cache elements 355 // repeatedly, but use a local copy: 356 PcDesc* res; 357 358 // Step one: Check the most recently added value. 359 res = _pc_descs[0]; 360 if (res == NULL) return NULL; // native method; no PcDescs at all 361 if (match_desc(res, pc_offset, approximate)) { 362 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_repeats); 363 return res; 364 } 365 366 // Step two: Check the rest of the LRU cache. 367 for (int i = 1; i < cache_size; ++i) { 368 res = _pc_descs[i]; 369 if (res->pc_offset() < 0) break; // optimization: skip empty cache 370 if (match_desc(res, pc_offset, approximate)) { 371 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_hits); 372 return res; 373 } 374 } 375 376 // Report failure. 377 return NULL; 378 } 379 380 void PcDescCache::add_pc_desc(PcDesc* pc_desc) { 381 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_adds); 382 // Update the LRU cache by shifting pc_desc forward. 383 for (int i = 0; i < cache_size; i++) { 384 PcDesc* next = _pc_descs[i]; 385 _pc_descs[i] = pc_desc; 386 pc_desc = next; 387 } 388 } 389 390 // adjust pcs_size so that it is a multiple of both oopSize and 391 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple 392 // of oopSize, then 2*sizeof(PcDesc) is) 393 static int adjust_pcs_size(int pcs_size) { 394 int nsize = align_up(pcs_size, oopSize); 395 if ((nsize % sizeof(PcDesc)) != 0) { 396 nsize = pcs_size + sizeof(PcDesc); 397 } 398 assert((nsize % oopSize) == 0, "correct alignment"); 399 return nsize; 400 } 401 402 403 int nmethod::total_size() const { 404 return 405 consts_size() + 406 insts_size() + 407 stub_size() + 408 scopes_data_size() + 409 scopes_pcs_size() + 410 handler_table_size() + 411 nul_chk_table_size(); 412 } 413 414 address* nmethod::orig_pc_addr(const frame* fr) { 415 return (address*) ((address)fr->unextended_sp() + _orig_pc_offset); 416 } 417 418 const char* nmethod::compile_kind() const { 419 if (is_osr_method()) return "osr"; 420 if (method() != NULL && is_native_method()) return "c2n"; 421 return NULL; 422 } 423 424 // Fill in default values for various flag fields 425 void nmethod::init_defaults() { 426 _state = not_installed; 427 _has_flushed_dependencies = 0; 428 _lock_count = 0; 429 _stack_traversal_mark = 0; 430 _unload_reported = false; // jvmti state 431 _is_far_code = false; // nmethods are located in CodeCache 432 433 #ifdef ASSERT 434 _oops_are_stale = false; 435 #endif 436 437 _oops_do_mark_link = NULL; 438 _jmethod_id = NULL; 439 _osr_link = NULL; 440 #if INCLUDE_RTM_OPT 441 _rtm_state = NoRTM; 442 #endif 443 } 444 445 nmethod* nmethod::new_native_nmethod(const methodHandle& method, 446 int compile_id, 447 CodeBuffer *code_buffer, 448 int vep_offset, 449 int frame_complete, 450 int frame_size, 451 ByteSize basic_lock_owner_sp_offset, 452 ByteSize basic_lock_sp_offset, 453 OopMapSet* oop_maps) { 454 code_buffer->finalize_oop_references(method); 455 // create nmethod 456 nmethod* nm = NULL; 457 { 458 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 459 int native_nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod)); 460 461 CodeOffsets offsets; 462 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset); 463 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete); 464 nm = new (native_nmethod_size, CompLevel_none) 465 nmethod(method(), compiler_none, native_nmethod_size, 466 compile_id, &offsets, 467 code_buffer, frame_size, 468 basic_lock_owner_sp_offset, 469 basic_lock_sp_offset, 470 oop_maps); 471 NOT_PRODUCT(if (nm != NULL) native_nmethod_stats.note_native_nmethod(nm)); 472 } 473 474 if (nm != NULL) { 475 // verify nmethod 476 debug_only(nm->verify();) // might block 477 478 nm->log_new_nmethod(); 479 nm->make_in_use(); 480 } 481 return nm; 482 } 483 484 nmethod* nmethod::new_nmethod(const methodHandle& method, 485 int compile_id, 486 int entry_bci, 487 CodeOffsets* offsets, 488 int orig_pc_offset, 489 DebugInformationRecorder* debug_info, 490 Dependencies* dependencies, 491 CodeBuffer* code_buffer, int frame_size, 492 OopMapSet* oop_maps, 493 ExceptionHandlerTable* handler_table, 494 ImplicitExceptionTable* nul_chk_table, 495 AbstractCompiler* compiler, 496 int comp_level 497 #if INCLUDE_JVMCI 498 , char* speculations, 499 int speculations_len, 500 int nmethod_mirror_index, 501 const char* nmethod_mirror_name, 502 FailedSpeculation** failed_speculations 503 #endif 504 ) 505 { 506 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); 507 code_buffer->finalize_oop_references(method); 508 // create nmethod 509 nmethod* nm = NULL; 510 { MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 511 #if INCLUDE_JVMCI 512 int jvmci_data_size = !compiler->is_jvmci() ? 0 : JVMCINMethodData::compute_size(nmethod_mirror_name); 513 #endif 514 int nmethod_size = 515 CodeBlob::allocation_size(code_buffer, sizeof(nmethod)) 516 + adjust_pcs_size(debug_info->pcs_size()) 517 + align_up((int)dependencies->size_in_bytes(), oopSize) 518 + align_up(handler_table->size_in_bytes() , oopSize) 519 + align_up(nul_chk_table->size_in_bytes() , oopSize) 520 #if INCLUDE_JVMCI 521 + align_up(speculations_len , oopSize) 522 + align_up(jvmci_data_size , oopSize) 523 #endif 524 + align_up(debug_info->data_size() , oopSize); 525 526 nm = new (nmethod_size, comp_level) 527 nmethod(method(), compiler->type(), nmethod_size, compile_id, entry_bci, offsets, 528 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size, 529 oop_maps, 530 handler_table, 531 nul_chk_table, 532 compiler, 533 comp_level 534 #if INCLUDE_JVMCI 535 , speculations, 536 speculations_len, 537 jvmci_data_size 538 #endif 539 ); 540 541 if (nm != NULL) { 542 #if INCLUDE_JVMCI 543 if (compiler->is_jvmci()) { 544 // Initialize the JVMCINMethodData object inlined into nm 545 nm->jvmci_nmethod_data()->initialize(nmethod_mirror_index, nmethod_mirror_name, failed_speculations); 546 } 547 #endif 548 // To make dependency checking during class loading fast, record 549 // the nmethod dependencies in the classes it is dependent on. 550 // This allows the dependency checking code to simply walk the 551 // class hierarchy above the loaded class, checking only nmethods 552 // which are dependent on those classes. The slow way is to 553 // check every nmethod for dependencies which makes it linear in 554 // the number of methods compiled. For applications with a lot 555 // classes the slow way is too slow. 556 for (Dependencies::DepStream deps(nm); deps.next(); ) { 557 if (deps.type() == Dependencies::call_site_target_value) { 558 // CallSite dependencies are managed on per-CallSite instance basis. 559 oop call_site = deps.argument_oop(0); 560 MethodHandles::add_dependent_nmethod(call_site, nm); 561 } else { 562 Klass* klass = deps.context_type(); 563 if (klass == NULL) { 564 continue; // ignore things like evol_method 565 } 566 // record this nmethod as dependent on this klass 567 InstanceKlass::cast(klass)->add_dependent_nmethod(nm); 568 } 569 } 570 NOT_PRODUCT(if (nm != NULL) note_java_nmethod(nm)); 571 } 572 } 573 // Do verification and logging outside CodeCache_lock. 574 if (nm != NULL) { 575 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet. 576 DEBUG_ONLY(nm->verify();) 577 nm->log_new_nmethod(); 578 } 579 return nm; 580 } 581 582 // For native wrappers 583 nmethod::nmethod( 584 Method* method, 585 CompilerType type, 586 int nmethod_size, 587 int compile_id, 588 CodeOffsets* offsets, 589 CodeBuffer* code_buffer, 590 int frame_size, 591 ByteSize basic_lock_owner_sp_offset, 592 ByteSize basic_lock_sp_offset, 593 OopMapSet* oop_maps ) 594 : CompiledMethod(method, "native nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false), 595 _is_unloading_state(0), 596 _native_receiver_sp_offset(basic_lock_owner_sp_offset), 597 _native_basic_lock_sp_offset(basic_lock_sp_offset) 598 { 599 { 600 int scopes_data_offset = 0; 601 int deoptimize_offset = 0; 602 int deoptimize_mh_offset = 0; 603 604 debug_only(NoSafepointVerifier nsv;) 605 assert_locked_or_safepoint(CodeCache_lock); 606 607 init_defaults(); 608 _entry_bci = InvocationEntryBci; 609 // We have no exception handler or deopt handler make the 610 // values something that will never match a pc like the nmethod vtable entry 611 _exception_offset = 0; 612 _orig_pc_offset = 0; 613 614 _consts_offset = data_offset(); 615 _stub_offset = data_offset(); 616 _oops_offset = data_offset(); 617 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize); 618 scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize); 619 _scopes_pcs_offset = scopes_data_offset; 620 _dependencies_offset = _scopes_pcs_offset; 621 _handler_table_offset = _dependencies_offset; 622 _nul_chk_table_offset = _handler_table_offset; 623 #if INCLUDE_JVMCI 624 _speculations_offset = _nul_chk_table_offset; 625 _jvmci_data_offset = _speculations_offset; 626 _nmethod_end_offset = _jvmci_data_offset; 627 #else 628 _nmethod_end_offset = _nul_chk_table_offset; 629 #endif 630 _compile_id = compile_id; 631 _comp_level = CompLevel_none; 632 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 633 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 634 _osr_entry_point = NULL; 635 _exception_cache = NULL; 636 _pc_desc_container.reset_to(NULL); 637 _hotness_counter = NMethodSweeper::hotness_counter_reset_val(); 638 639 _scopes_data_begin = (address) this + scopes_data_offset; 640 _deopt_handler_begin = (address) this + deoptimize_offset; 641 _deopt_mh_handler_begin = (address) this + deoptimize_mh_offset; 642 643 code_buffer->copy_code_and_locs_to(this); 644 code_buffer->copy_values_to(this); 645 646 clear_unloading_state(); 647 648 Universe::heap()->register_nmethod(this); 649 debug_only(Universe::heap()->verify_nmethod(this)); 650 651 CodeCache::commit(this); 652 } 653 654 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) { 655 ttyLocker ttyl; // keep the following output all in one block 656 // This output goes directly to the tty, not the compiler log. 657 // To enable tools to match it up with the compilation activity, 658 // be sure to tag this tty output with the compile ID. 659 if (xtty != NULL) { 660 xtty->begin_head("print_native_nmethod"); 661 xtty->method(_method); 662 xtty->stamp(); 663 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this); 664 } 665 // Print the header part, then print the requested information. 666 // This is both handled in decode2(), called via print_code() -> decode() 667 if (PrintNativeNMethods) { 668 tty->print_cr("-------------------------- Assembly (native nmethod) ---------------------------"); 669 print_code(); 670 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 671 #if defined(SUPPORT_DATA_STRUCTS) 672 if (AbstractDisassembler::show_structs()) { 673 if (oop_maps != NULL) { 674 tty->print("oop maps:"); // oop_maps->print_on(tty) outputs a cr() at the beginning 675 oop_maps->print_on(tty); 676 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 677 } 678 } 679 #endif 680 } else { 681 print(); // print the header part only. 682 } 683 #if defined(SUPPORT_DATA_STRUCTS) 684 if (AbstractDisassembler::show_structs()) { 685 if (PrintRelocations) { 686 print_relocations(); 687 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 688 } 689 } 690 #endif 691 if (xtty != NULL) { 692 xtty->tail("print_native_nmethod"); 693 } 694 } 695 } 696 697 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () { 698 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level)); 699 } 700 701 nmethod::nmethod( 702 Method* method, 703 CompilerType type, 704 int nmethod_size, 705 int compile_id, 706 int entry_bci, 707 CodeOffsets* offsets, 708 int orig_pc_offset, 709 DebugInformationRecorder* debug_info, 710 Dependencies* dependencies, 711 CodeBuffer *code_buffer, 712 int frame_size, 713 OopMapSet* oop_maps, 714 ExceptionHandlerTable* handler_table, 715 ImplicitExceptionTable* nul_chk_table, 716 AbstractCompiler* compiler, 717 int comp_level 718 #if INCLUDE_JVMCI 719 , char* speculations, 720 int speculations_len, 721 int jvmci_data_size 722 #endif 723 ) 724 : CompiledMethod(method, "nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false), 725 _is_unloading_state(0), 726 _native_receiver_sp_offset(in_ByteSize(-1)), 727 _native_basic_lock_sp_offset(in_ByteSize(-1)) 728 { 729 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); 730 { 731 debug_only(NoSafepointVerifier nsv;) 732 assert_locked_or_safepoint(CodeCache_lock); 733 734 _deopt_handler_begin = (address) this; 735 _deopt_mh_handler_begin = (address) this; 736 737 init_defaults(); 738 _entry_bci = entry_bci; 739 _compile_id = compile_id; 740 _comp_level = comp_level; 741 _orig_pc_offset = orig_pc_offset; 742 _hotness_counter = NMethodSweeper::hotness_counter_reset_val(); 743 744 // Section offsets 745 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts()); 746 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs()); 747 set_ctable_begin(header_begin() + _consts_offset); 748 749 #if INCLUDE_JVMCI 750 if (compiler->is_jvmci()) { 751 // JVMCI might not produce any stub sections 752 if (offsets->value(CodeOffsets::Exceptions) != -1) { 753 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions); 754 } else { 755 _exception_offset = -1; 756 } 757 if (offsets->value(CodeOffsets::Deopt) != -1) { 758 _deopt_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::Deopt); 759 } else { 760 _deopt_handler_begin = NULL; 761 } 762 if (offsets->value(CodeOffsets::DeoptMH) != -1) { 763 _deopt_mh_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::DeoptMH); 764 } else { 765 _deopt_mh_handler_begin = NULL; 766 } 767 } else 768 #endif 769 { 770 // Exception handler and deopt handler are in the stub section 771 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set"); 772 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set"); 773 774 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions); 775 _deopt_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::Deopt); 776 if (offsets->value(CodeOffsets::DeoptMH) != -1) { 777 _deopt_mh_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::DeoptMH); 778 } else { 779 _deopt_mh_handler_begin = NULL; 780 } 781 } 782 if (offsets->value(CodeOffsets::UnwindHandler) != -1) { 783 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler); 784 } else { 785 _unwind_handler_offset = -1; 786 } 787 788 _oops_offset = data_offset(); 789 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize); 790 int scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize); 791 792 _scopes_pcs_offset = scopes_data_offset + align_up(debug_info->data_size (), oopSize); 793 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size()); 794 _handler_table_offset = _dependencies_offset + align_up((int)dependencies->size_in_bytes (), oopSize); 795 _nul_chk_table_offset = _handler_table_offset + align_up(handler_table->size_in_bytes(), oopSize); 796 #if INCLUDE_JVMCI 797 _speculations_offset = _nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize); 798 _jvmci_data_offset = _speculations_offset + align_up(speculations_len, oopSize); 799 _nmethod_end_offset = _jvmci_data_offset + align_up(jvmci_data_size, oopSize); 800 #else 801 _nmethod_end_offset = _nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize); 802 #endif 803 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 804 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 805 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry); 806 _exception_cache = NULL; 807 _scopes_data_begin = (address) this + scopes_data_offset; 808 809 _pc_desc_container.reset_to(scopes_pcs_begin()); 810 811 code_buffer->copy_code_and_locs_to(this); 812 // Copy contents of ScopeDescRecorder to nmethod 813 code_buffer->copy_values_to(this); 814 debug_info->copy_to(this); 815 dependencies->copy_to(this); 816 clear_unloading_state(); 817 818 Universe::heap()->register_nmethod(this); 819 debug_only(Universe::heap()->verify_nmethod(this)); 820 821 CodeCache::commit(this); 822 823 // Copy contents of ExceptionHandlerTable to nmethod 824 handler_table->copy_to(this); 825 nul_chk_table->copy_to(this); 826 827 #if INCLUDE_JVMCI 828 // Copy speculations to nmethod 829 if (speculations_size() != 0) { 830 memcpy(speculations_begin(), speculations, speculations_len); 831 } 832 #endif 833 834 // we use the information of entry points to find out if a method is 835 // static or non static 836 assert(compiler->is_c2() || compiler->is_jvmci() || 837 _method->is_static() == (entry_point() == _verified_entry_point), 838 " entry points must be same for static methods and vice versa"); 839 } 840 } 841 842 // Print a short set of xml attributes to identify this nmethod. The 843 // output should be embedded in some other element. 844 void nmethod::log_identity(xmlStream* log) const { 845 log->print(" compile_id='%d'", compile_id()); 846 const char* nm_kind = compile_kind(); 847 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind); 848 log->print(" compiler='%s'", compiler_name()); 849 if (TieredCompilation) { 850 log->print(" level='%d'", comp_level()); 851 } 852 #if INCLUDE_JVMCI 853 if (jvmci_nmethod_data() != NULL) { 854 const char* jvmci_name = jvmci_nmethod_data()->name(); 855 if (jvmci_name != NULL) { 856 log->print(" jvmci_mirror_name='"); 857 log->text("%s", jvmci_name); 858 log->print("'"); 859 } 860 } 861 #endif 862 } 863 864 865 #define LOG_OFFSET(log, name) \ 866 if (p2i(name##_end()) - p2i(name##_begin())) \ 867 log->print(" " XSTR(name) "_offset='" INTX_FORMAT "'" , \ 868 p2i(name##_begin()) - p2i(this)) 869 870 871 void nmethod::log_new_nmethod() const { 872 if (LogCompilation && xtty != NULL) { 873 ttyLocker ttyl; 874 HandleMark hm; 875 xtty->begin_elem("nmethod"); 876 log_identity(xtty); 877 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size()); 878 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this)); 879 880 LOG_OFFSET(xtty, relocation); 881 LOG_OFFSET(xtty, consts); 882 LOG_OFFSET(xtty, insts); 883 LOG_OFFSET(xtty, stub); 884 LOG_OFFSET(xtty, scopes_data); 885 LOG_OFFSET(xtty, scopes_pcs); 886 LOG_OFFSET(xtty, dependencies); 887 LOG_OFFSET(xtty, handler_table); 888 LOG_OFFSET(xtty, nul_chk_table); 889 LOG_OFFSET(xtty, oops); 890 LOG_OFFSET(xtty, metadata); 891 892 xtty->method(method()); 893 xtty->stamp(); 894 xtty->end_elem(); 895 } 896 } 897 898 #undef LOG_OFFSET 899 900 901 // Print out more verbose output usually for a newly created nmethod. 902 void nmethod::print_on(outputStream* st, const char* msg) const { 903 if (st != NULL) { 904 ttyLocker ttyl; 905 if (WizardMode) { 906 CompileTask::print(st, this, msg, /*short_form:*/ true); 907 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this)); 908 } else { 909 CompileTask::print(st, this, msg, /*short_form:*/ false); 910 } 911 } 912 } 913 914 void nmethod::maybe_print_nmethod(DirectiveSet* directive) { 915 bool printnmethods = directive->PrintAssemblyOption || directive->PrintNMethodsOption; 916 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) { 917 print_nmethod(printnmethods); 918 } 919 } 920 921 void nmethod::print_nmethod(bool printmethod) { 922 ttyLocker ttyl; // keep the following output all in one block 923 if (xtty != NULL) { 924 xtty->begin_head("print_nmethod"); 925 log_identity(xtty); 926 xtty->stamp(); 927 xtty->end_head(); 928 } 929 // Print the header part, then print the requested information. 930 // This is both handled in decode2(). 931 if (printmethod) { 932 HandleMark hm; 933 ResourceMark m; 934 if (is_compiled_by_c1()) { 935 tty->cr(); 936 tty->print_cr("============================= C1-compiled nmethod =============================="); 937 } 938 if (is_compiled_by_jvmci()) { 939 tty->cr(); 940 tty->print_cr("=========================== JVMCI-compiled nmethod ============================="); 941 } 942 tty->print_cr("----------------------------------- Assembly -----------------------------------"); 943 decode2(tty); 944 #if defined(SUPPORT_DATA_STRUCTS) 945 if (AbstractDisassembler::show_structs()) { 946 // Print the oops from the underlying CodeBlob as well. 947 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 948 print_oops(tty); 949 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 950 print_metadata(tty); 951 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 952 print_pcs(); 953 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 954 if (oop_maps() != NULL) { 955 tty->print("oop maps:"); // oop_maps()->print_on(tty) outputs a cr() at the beginning 956 oop_maps()->print_on(tty); 957 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 958 } 959 } 960 #endif 961 } else { 962 print(); // print the header part only. 963 } 964 965 #if defined(SUPPORT_DATA_STRUCTS) 966 if (AbstractDisassembler::show_structs()) { 967 if (printmethod || PrintDebugInfo || CompilerOracle::has_option_string(_method, "PrintDebugInfo")) { 968 print_scopes(); 969 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 970 } 971 if (printmethod || PrintRelocations || CompilerOracle::has_option_string(_method, "PrintRelocations")) { 972 print_relocations(); 973 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 974 } 975 if (printmethod || PrintDependencies || CompilerOracle::has_option_string(_method, "PrintDependencies")) { 976 print_dependencies(); 977 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 978 } 979 if (printmethod || PrintExceptionHandlers) { 980 print_handler_table(); 981 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 982 print_nul_chk_table(); 983 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 984 } 985 986 if (printmethod) { 987 print_recorded_oops(); 988 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 989 print_recorded_metadata(); 990 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 991 } 992 } 993 #endif 994 995 if (xtty != NULL) { 996 xtty->tail("print_nmethod"); 997 } 998 } 999 1000 1001 // Promote one word from an assembly-time handle to a live embedded oop. 1002 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) { 1003 if (handle == NULL || 1004 // As a special case, IC oops are initialized to 1 or -1. 1005 handle == (jobject) Universe::non_oop_word()) { 1006 (*dest) = (oop) handle; 1007 } else { 1008 (*dest) = JNIHandles::resolve_non_null(handle); 1009 } 1010 } 1011 1012 1013 // Have to have the same name because it's called by a template 1014 void nmethod::copy_values(GrowableArray<jobject>* array) { 1015 int length = array->length(); 1016 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough"); 1017 oop* dest = oops_begin(); 1018 for (int index = 0 ; index < length; index++) { 1019 initialize_immediate_oop(&dest[index], array->at(index)); 1020 } 1021 1022 // Now we can fix up all the oops in the code. We need to do this 1023 // in the code because the assembler uses jobjects as placeholders. 1024 // The code and relocations have already been initialized by the 1025 // CodeBlob constructor, so it is valid even at this early point to 1026 // iterate over relocations and patch the code. 1027 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true); 1028 } 1029 1030 void nmethod::copy_values(GrowableArray<Metadata*>* array) { 1031 int length = array->length(); 1032 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough"); 1033 Metadata** dest = metadata_begin(); 1034 for (int index = 0 ; index < length; index++) { 1035 dest[index] = array->at(index); 1036 } 1037 } 1038 1039 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) { 1040 // re-patch all oop-bearing instructions, just in case some oops moved 1041 RelocIterator iter(this, begin, end); 1042 while (iter.next()) { 1043 if (iter.type() == relocInfo::oop_type) { 1044 oop_Relocation* reloc = iter.oop_reloc(); 1045 if (initialize_immediates && reloc->oop_is_immediate()) { 1046 oop* dest = reloc->oop_addr(); 1047 initialize_immediate_oop(dest, (jobject) *dest); 1048 } 1049 // Refresh the oop-related bits of this instruction. 1050 reloc->fix_oop_relocation(); 1051 } else if (iter.type() == relocInfo::metadata_type) { 1052 metadata_Relocation* reloc = iter.metadata_reloc(); 1053 reloc->fix_metadata_relocation(); 1054 } 1055 } 1056 } 1057 1058 1059 void nmethod::verify_clean_inline_caches() { 1060 assert(CompiledICLocker::is_safe(this), "mt unsafe call"); 1061 1062 ResourceMark rm; 1063 RelocIterator iter(this, oops_reloc_begin()); 1064 while(iter.next()) { 1065 switch(iter.type()) { 1066 case relocInfo::virtual_call_type: 1067 case relocInfo::opt_virtual_call_type: { 1068 CompiledIC *ic = CompiledIC_at(&iter); 1069 // Ok, to lookup references to zombies here 1070 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination()); 1071 assert(cb != NULL, "destination not in CodeBlob?"); 1072 nmethod* nm = cb->as_nmethod_or_null(); 1073 if( nm != NULL ) { 1074 // Verify that inline caches pointing to both zombie and not_entrant methods are clean 1075 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 1076 assert(ic->is_clean(), "IC should be clean"); 1077 } 1078 } 1079 break; 1080 } 1081 case relocInfo::static_call_type: { 1082 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc()); 1083 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination()); 1084 assert(cb != NULL, "destination not in CodeBlob?"); 1085 nmethod* nm = cb->as_nmethod_or_null(); 1086 if( nm != NULL ) { 1087 // Verify that inline caches pointing to both zombie and not_entrant methods are clean 1088 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 1089 assert(csc->is_clean(), "IC should be clean"); 1090 } 1091 } 1092 break; 1093 } 1094 default: 1095 break; 1096 } 1097 } 1098 } 1099 1100 // This is a private interface with the sweeper. 1101 void nmethod::mark_as_seen_on_stack() { 1102 assert(is_alive(), "Must be an alive method"); 1103 // Set the traversal mark to ensure that the sweeper does 2 1104 // cleaning passes before moving to zombie. 1105 set_stack_traversal_mark(NMethodSweeper::traversal_count()); 1106 } 1107 1108 // Tell if a non-entrant method can be converted to a zombie (i.e., 1109 // there are no activations on the stack, not in use by the VM, 1110 // and not in use by the ServiceThread) 1111 bool nmethod::can_convert_to_zombie() { 1112 // Note that this is called when the sweeper has observed the nmethod to be 1113 // not_entrant. However, with concurrent code cache unloading, the state 1114 // might have moved on to unloaded if it is_unloading(), due to racing 1115 // concurrent GC threads. 1116 assert(is_not_entrant() || is_unloading(), "must be a non-entrant method"); 1117 1118 // Since the nmethod sweeper only does partial sweep the sweeper's traversal 1119 // count can be greater than the stack traversal count before it hits the 1120 // nmethod for the second time. 1121 // If an is_unloading() nmethod is still not_entrant, then it is not safe to 1122 // convert it to zombie due to GC unloading interactions. However, if it 1123 // has become unloaded, then it is okay to convert such nmethods to zombie. 1124 return stack_traversal_mark() + 1 < NMethodSweeper::traversal_count() && 1125 !is_locked_by_vm() && (!is_unloading() || is_unloaded()); 1126 } 1127 1128 void nmethod::inc_decompile_count() { 1129 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return; 1130 // Could be gated by ProfileTraps, but do not bother... 1131 Method* m = method(); 1132 if (m == NULL) return; 1133 MethodData* mdo = m->method_data(); 1134 if (mdo == NULL) return; 1135 // There is a benign race here. See comments in methodData.hpp. 1136 mdo->inc_decompile_count(); 1137 } 1138 1139 bool nmethod::try_transition(int new_state_int) { 1140 signed char new_state = new_state_int; 1141 for (;;) { 1142 signed char old_state = Atomic::load(&_state); 1143 if (old_state >= new_state) { 1144 // Ensure monotonicity of transitions. 1145 return false; 1146 } 1147 if (Atomic::cmpxchg(new_state, &_state, old_state) == old_state) { 1148 return true; 1149 } 1150 } 1151 } 1152 1153 void nmethod::make_unloaded() { 1154 post_compiled_method_unload(); 1155 1156 // This nmethod is being unloaded, make sure that dependencies 1157 // recorded in instanceKlasses get flushed. 1158 // Since this work is being done during a GC, defer deleting dependencies from the 1159 // InstanceKlass. 1160 assert(Universe::heap()->is_gc_active() || Thread::current()->is_ConcurrentGC_thread(), 1161 "should only be called during gc"); 1162 flush_dependencies(/*delete_immediately*/false); 1163 1164 // Break cycle between nmethod & method 1165 LogTarget(Trace, class, unload, nmethod) lt; 1166 if (lt.is_enabled()) { 1167 LogStream ls(lt); 1168 ls.print("making nmethod " INTPTR_FORMAT 1169 " unloadable, Method*(" INTPTR_FORMAT 1170 ") ", 1171 p2i(this), p2i(_method)); 1172 ls.cr(); 1173 } 1174 // Unlink the osr method, so we do not look this up again 1175 if (is_osr_method()) { 1176 // Invalidate the osr nmethod only once. Note that with concurrent 1177 // code cache unloading, OSR nmethods are invalidated before they 1178 // are made unloaded. Therefore, this becomes a no-op then. 1179 if (is_in_use()) { 1180 invalidate_osr_method(); 1181 } 1182 #ifdef ASSERT 1183 if (method() != NULL) { 1184 // Make sure osr nmethod is invalidated, i.e. not on the list 1185 bool found = method()->method_holder()->remove_osr_nmethod(this); 1186 assert(!found, "osr nmethod should have been invalidated"); 1187 } 1188 #endif 1189 } 1190 1191 // If _method is already NULL the Method* is about to be unloaded, 1192 // so we don't have to break the cycle. Note that it is possible to 1193 // have the Method* live here, in case we unload the nmethod because 1194 // it is pointing to some oop (other than the Method*) being unloaded. 1195 if (_method != NULL) { 1196 // OSR methods point to the Method*, but the Method* does not 1197 // point back! 1198 if (_method->code() == this) { 1199 _method->clear_code(); // Break a cycle 1200 } 1201 } 1202 1203 // Make the class unloaded - i.e., change state and notify sweeper 1204 assert(SafepointSynchronize::is_at_safepoint() || Thread::current()->is_ConcurrentGC_thread(), 1205 "must be at safepoint"); 1206 1207 { 1208 // Clear ICStubs and release any CompiledICHolders. 1209 CompiledICLocker ml(this); 1210 clear_ic_callsites(); 1211 } 1212 1213 // Unregister must be done before the state change 1214 { 1215 MutexLocker ml(SafepointSynchronize::is_at_safepoint() ? NULL : CodeCache_lock, 1216 Mutex::_no_safepoint_check_flag); 1217 Universe::heap()->unregister_nmethod(this); 1218 } 1219 1220 // Clear the method of this dead nmethod 1221 set_method(NULL); 1222 1223 // Log the unloading. 1224 log_state_change(); 1225 1226 // The Method* is gone at this point 1227 assert(_method == NULL, "Tautology"); 1228 1229 set_osr_link(NULL); 1230 NMethodSweeper::report_state_change(this); 1231 1232 bool transition_success = try_transition(unloaded); 1233 1234 // It is an important invariant that there exists no race between 1235 // the sweeper and GC thread competing for making the same nmethod 1236 // zombie and unloaded respectively. This is ensured by 1237 // can_convert_to_zombie() returning false for any is_unloading() 1238 // nmethod, informing the sweeper not to step on any GC toes. 1239 assert(transition_success, "Invalid nmethod transition to unloaded"); 1240 1241 #if INCLUDE_JVMCI 1242 // Clear the link between this nmethod and a HotSpotNmethod mirror 1243 JVMCINMethodData* nmethod_data = jvmci_nmethod_data(); 1244 if (nmethod_data != NULL) { 1245 nmethod_data->invalidate_nmethod_mirror(this); 1246 nmethod_data->clear_nmethod_mirror(this); 1247 } 1248 #endif 1249 } 1250 1251 void nmethod::invalidate_osr_method() { 1252 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); 1253 // Remove from list of active nmethods 1254 if (method() != NULL) { 1255 method()->method_holder()->remove_osr_nmethod(this); 1256 } 1257 } 1258 1259 void nmethod::log_state_change() const { 1260 if (LogCompilation) { 1261 if (xtty != NULL) { 1262 ttyLocker ttyl; // keep the following output all in one block 1263 if (_state == unloaded) { 1264 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'", 1265 os::current_thread_id()); 1266 } else { 1267 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s", 1268 os::current_thread_id(), 1269 (_state == zombie ? " zombie='1'" : "")); 1270 } 1271 log_identity(xtty); 1272 xtty->stamp(); 1273 xtty->end_elem(); 1274 } 1275 } 1276 1277 const char *state_msg = _state == zombie ? "made zombie" : "made not entrant"; 1278 CompileTask::print_ul(this, state_msg); 1279 if (PrintCompilation && _state != unloaded) { 1280 print_on(tty, state_msg); 1281 } 1282 } 1283 1284 void nmethod::unlink_from_method(bool acquire_lock) { 1285 // We need to check if both the _code and _from_compiled_code_entry_point 1286 // refer to this nmethod because there is a race in setting these two fields 1287 // in Method* as seen in bugid 4947125. 1288 // If the vep() points to the zombie nmethod, the memory for the nmethod 1289 // could be flushed and the compiler and vtable stubs could still call 1290 // through it. 1291 if (method() != NULL && (method()->code() == this || 1292 method()->from_compiled_entry() == verified_entry_point())) { 1293 method()->clear_code(acquire_lock); 1294 } 1295 } 1296 1297 /** 1298 * Common functionality for both make_not_entrant and make_zombie 1299 */ 1300 bool nmethod::make_not_entrant_or_zombie(int state) { 1301 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant"); 1302 assert(!is_zombie(), "should not already be a zombie"); 1303 1304 if (Atomic::load(&_state) >= state) { 1305 // Avoid taking the lock if already in required state. 1306 // This is safe from races because the state is an end-state, 1307 // which the nmethod cannot back out of once entered. 1308 // No need for fencing either. 1309 return false; 1310 } 1311 1312 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below. 1313 nmethodLocker nml(this); 1314 methodHandle the_method(method()); 1315 // This can be called while the system is already at a safepoint which is ok 1316 NoSafepointVerifier nsv(true, !SafepointSynchronize::is_at_safepoint()); 1317 1318 // during patching, depending on the nmethod state we must notify the GC that 1319 // code has been unloaded, unregistering it. We cannot do this right while 1320 // holding the Patching_lock because we need to use the CodeCache_lock. This 1321 // would be prone to deadlocks. 1322 // This flag is used to remember whether we need to later lock and unregister. 1323 bool nmethod_needs_unregister = false; 1324 1325 { 1326 // invalidate osr nmethod before acquiring the patching lock since 1327 // they both acquire leaf locks and we don't want a deadlock. 1328 // This logic is equivalent to the logic below for patching the 1329 // verified entry point of regular methods. We check that the 1330 // nmethod is in use to ensure that it is invalidated only once. 1331 if (is_osr_method() && is_in_use()) { 1332 // this effectively makes the osr nmethod not entrant 1333 invalidate_osr_method(); 1334 } 1335 1336 // Enter critical section. Does not block for safepoint. 1337 MutexLocker pl(Patching_lock, Mutex::_no_safepoint_check_flag); 1338 1339 if (Atomic::load(&_state) >= state) { 1340 // another thread already performed this transition so nothing 1341 // to do, but return false to indicate this. 1342 return false; 1343 } 1344 1345 // The caller can be calling the method statically or through an inline 1346 // cache call. 1347 if (!is_osr_method() && !is_not_entrant()) { 1348 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(), 1349 SharedRuntime::get_handle_wrong_method_stub()); 1350 } 1351 1352 if (is_in_use() && update_recompile_counts()) { 1353 // It's a true state change, so mark the method as decompiled. 1354 // Do it only for transition from alive. 1355 inc_decompile_count(); 1356 } 1357 1358 // If the state is becoming a zombie, signal to unregister the nmethod with 1359 // the heap. 1360 // This nmethod may have already been unloaded during a full GC. 1361 if ((state == zombie) && !is_unloaded()) { 1362 nmethod_needs_unregister = true; 1363 } 1364 1365 // Must happen before state change. Otherwise we have a race condition in 1366 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately 1367 // transition its state from 'not_entrant' to 'zombie' without having to wait 1368 // for stack scanning. 1369 if (state == not_entrant) { 1370 mark_as_seen_on_stack(); 1371 OrderAccess::storestore(); // _stack_traversal_mark and _state 1372 } 1373 1374 // Change state 1375 if (!try_transition(state)) { 1376 // If the transition fails, it is due to another thread making the nmethod more 1377 // dead. In particular, one thread might be making the nmethod unloaded concurrently. 1378 // If so, having patched in the jump in the verified entry unnecessarily is fine. 1379 // The nmethod is no longer possible to call by Java threads. 1380 // Incrementing the decompile count is also fine as the caller of make_not_entrant() 1381 // had a valid reason to deoptimize the nmethod. 1382 // Marking the nmethod as seen on stack also has no effect, as the nmethod is now 1383 // !is_alive(), and the seen on stack value is only used to convert not_entrant 1384 // nmethods to zombie in can_convert_to_zombie(). 1385 return false; 1386 } 1387 1388 // Log the transition once 1389 log_state_change(); 1390 1391 // Remove nmethod from method. 1392 unlink_from_method(false /* already owns Patching_lock */); 1393 } // leave critical region under Patching_lock 1394 1395 #if INCLUDE_JVMCI 1396 // Invalidate can't occur while holding the Patching lock 1397 JVMCINMethodData* nmethod_data = jvmci_nmethod_data(); 1398 if (nmethod_data != NULL) { 1399 nmethod_data->invalidate_nmethod_mirror(this); 1400 } 1401 #endif 1402 1403 #ifdef ASSERT 1404 if (is_osr_method() && method() != NULL) { 1405 // Make sure osr nmethod is invalidated, i.e. not on the list 1406 bool found = method()->method_holder()->remove_osr_nmethod(this); 1407 assert(!found, "osr nmethod should have been invalidated"); 1408 } 1409 #endif 1410 1411 // When the nmethod becomes zombie it is no longer alive so the 1412 // dependencies must be flushed. nmethods in the not_entrant 1413 // state will be flushed later when the transition to zombie 1414 // happens or they get unloaded. 1415 if (state == zombie) { 1416 { 1417 // Flushing dependencies must be done before any possible 1418 // safepoint can sneak in, otherwise the oops used by the 1419 // dependency logic could have become stale. 1420 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1421 if (nmethod_needs_unregister) { 1422 Universe::heap()->unregister_nmethod(this); 1423 } 1424 flush_dependencies(/*delete_immediately*/true); 1425 } 1426 1427 #if INCLUDE_JVMCI 1428 // Now that the nmethod has been unregistered, it's 1429 // safe to clear the HotSpotNmethod mirror oop. 1430 if (nmethod_data != NULL) { 1431 nmethod_data->clear_nmethod_mirror(this); 1432 } 1433 #endif 1434 1435 // Clear ICStubs to prevent back patching stubs of zombie or flushed 1436 // nmethods during the next safepoint (see ICStub::finalize), as well 1437 // as to free up CompiledICHolder resources. 1438 { 1439 CompiledICLocker ml(this); 1440 clear_ic_callsites(); 1441 } 1442 1443 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload 1444 // event and it hasn't already been reported for this nmethod then 1445 // report it now. The event may have been reported earlier if the GC 1446 // marked it for unloading). JvmtiDeferredEventQueue support means 1447 // we no longer go to a safepoint here. 1448 post_compiled_method_unload(); 1449 1450 #ifdef ASSERT 1451 // It's no longer safe to access the oops section since zombie 1452 // nmethods aren't scanned for GC. 1453 _oops_are_stale = true; 1454 #endif 1455 // the Method may be reclaimed by class unloading now that the 1456 // nmethod is in zombie state 1457 set_method(NULL); 1458 } else { 1459 assert(state == not_entrant, "other cases may need to be handled differently"); 1460 } 1461 1462 if (TraceCreateZombies && state == zombie) { 1463 ResourceMark m; 1464 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"); 1465 } 1466 1467 NMethodSweeper::report_state_change(this); 1468 return true; 1469 } 1470 1471 void nmethod::flush() { 1472 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1473 // Note that there are no valid oops in the nmethod anymore. 1474 assert(!is_osr_method() || is_unloaded() || is_zombie(), 1475 "osr nmethod must be unloaded or zombie before flushing"); 1476 assert(is_zombie() || is_osr_method(), "must be a zombie method"); 1477 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed"); 1478 assert_locked_or_safepoint(CodeCache_lock); 1479 1480 // completely deallocate this method 1481 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, p2i(this)); 1482 if (PrintMethodFlushing) { 1483 tty->print_cr("*flushing %s nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT 1484 "/Free CodeCache:" SIZE_FORMAT "Kb", 1485 is_osr_method() ? "osr" : "",_compile_id, p2i(this), CodeCache::blob_count(), 1486 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024); 1487 } 1488 1489 // We need to deallocate any ExceptionCache data. 1490 // Note that we do not need to grab the nmethod lock for this, it 1491 // better be thread safe if we're disposing of it! 1492 ExceptionCache* ec = exception_cache(); 1493 set_exception_cache(NULL); 1494 while(ec != NULL) { 1495 ExceptionCache* next = ec->next(); 1496 delete ec; 1497 ec = next; 1498 } 1499 1500 Universe::heap()->flush_nmethod(this); 1501 CodeCache::unregister_old_nmethod(this); 1502 1503 CodeBlob::flush(); 1504 CodeCache::free(this); 1505 } 1506 1507 oop nmethod::oop_at(int index) const { 1508 if (index == 0) { 1509 return NULL; 1510 } 1511 return NativeAccess<AS_NO_KEEPALIVE>::oop_load(oop_addr_at(index)); 1512 } 1513 1514 oop nmethod::oop_at_phantom(int index) const { 1515 if (index == 0) { 1516 return NULL; 1517 } 1518 return NativeAccess<ON_PHANTOM_OOP_REF>::oop_load(oop_addr_at(index)); 1519 } 1520 1521 // 1522 // Notify all classes this nmethod is dependent on that it is no 1523 // longer dependent. This should only be called in two situations. 1524 // First, when a nmethod transitions to a zombie all dependents need 1525 // to be clear. Since zombification happens at a safepoint there's no 1526 // synchronization issues. The second place is a little more tricky. 1527 // During phase 1 of mark sweep class unloading may happen and as a 1528 // result some nmethods may get unloaded. In this case the flushing 1529 // of dependencies must happen during phase 1 since after GC any 1530 // dependencies in the unloaded nmethod won't be updated, so 1531 // traversing the dependency information in unsafe. In that case this 1532 // function is called with a boolean argument and this function only 1533 // notifies instanceKlasses that are reachable 1534 1535 void nmethod::flush_dependencies(bool delete_immediately) { 1536 DEBUG_ONLY(bool called_by_gc = Universe::heap()->is_gc_active() || Thread::current()->is_ConcurrentGC_thread();) 1537 assert(called_by_gc != delete_immediately, 1538 "delete_immediately is false if and only if we are called during GC"); 1539 if (!has_flushed_dependencies()) { 1540 set_has_flushed_dependencies(); 1541 for (Dependencies::DepStream deps(this); deps.next(); ) { 1542 if (deps.type() == Dependencies::call_site_target_value) { 1543 // CallSite dependencies are managed on per-CallSite instance basis. 1544 oop call_site = deps.argument_oop(0); 1545 if (delete_immediately) { 1546 assert_locked_or_safepoint(CodeCache_lock); 1547 MethodHandles::remove_dependent_nmethod(call_site, this); 1548 } else { 1549 MethodHandles::clean_dependency_context(call_site); 1550 } 1551 } else { 1552 Klass* klass = deps.context_type(); 1553 if (klass == NULL) { 1554 continue; // ignore things like evol_method 1555 } 1556 // During GC delete_immediately is false, and liveness 1557 // of dependee determines class that needs to be updated. 1558 if (delete_immediately) { 1559 assert_locked_or_safepoint(CodeCache_lock); 1560 InstanceKlass::cast(klass)->remove_dependent_nmethod(this); 1561 } else if (klass->is_loader_alive()) { 1562 // The GC may clean dependency contexts concurrently and in parallel. 1563 InstanceKlass::cast(klass)->clean_dependency_context(); 1564 } 1565 } 1566 } 1567 } 1568 } 1569 1570 // ------------------------------------------------------------------ 1571 // post_compiled_method_load_event 1572 // new method for install_code() path 1573 // Transfer information from compilation to jvmti 1574 void nmethod::post_compiled_method_load_event() { 1575 1576 Method* moop = method(); 1577 HOTSPOT_COMPILED_METHOD_LOAD( 1578 (char *) moop->klass_name()->bytes(), 1579 moop->klass_name()->utf8_length(), 1580 (char *) moop->name()->bytes(), 1581 moop->name()->utf8_length(), 1582 (char *) moop->signature()->bytes(), 1583 moop->signature()->utf8_length(), 1584 insts_begin(), insts_size()); 1585 1586 if (JvmtiExport::should_post_compiled_method_load() || 1587 JvmtiExport::should_post_compiled_method_unload()) { 1588 get_and_cache_jmethod_id(); 1589 } 1590 1591 if (JvmtiExport::should_post_compiled_method_load()) { 1592 // Let the Service thread (which is a real Java thread) post the event 1593 MutexLocker ml(Service_lock, Mutex::_no_safepoint_check_flag); 1594 JvmtiDeferredEventQueue::enqueue( 1595 JvmtiDeferredEvent::compiled_method_load_event(this)); 1596 } 1597 } 1598 1599 jmethodID nmethod::get_and_cache_jmethod_id() { 1600 if (_jmethod_id == NULL) { 1601 // Cache the jmethod_id since it can no longer be looked up once the 1602 // method itself has been marked for unloading. 1603 _jmethod_id = method()->jmethod_id(); 1604 } 1605 return _jmethod_id; 1606 } 1607 1608 void nmethod::post_compiled_method_unload() { 1609 if (unload_reported()) { 1610 // During unloading we transition to unloaded and then to zombie 1611 // and the unloading is reported during the first transition. 1612 return; 1613 } 1614 1615 assert(_method != NULL && !is_unloaded(), "just checking"); 1616 DTRACE_METHOD_UNLOAD_PROBE(method()); 1617 1618 // If a JVMTI agent has enabled the CompiledMethodUnload event then 1619 // post the event. Sometime later this nmethod will be made a zombie 1620 // by the sweeper but the Method* will not be valid at that point. 1621 // If the _jmethod_id is null then no load event was ever requested 1622 // so don't bother posting the unload. The main reason for this is 1623 // that the jmethodID is a weak reference to the Method* so if 1624 // it's being unloaded there's no way to look it up since the weak 1625 // ref will have been cleared. 1626 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) { 1627 assert(!unload_reported(), "already unloaded"); 1628 JvmtiDeferredEvent event = 1629 JvmtiDeferredEvent::compiled_method_unload_event(this, 1630 _jmethod_id, insts_begin()); 1631 MutexLocker ml(Service_lock, Mutex::_no_safepoint_check_flag); 1632 JvmtiDeferredEventQueue::enqueue(event); 1633 } 1634 1635 // The JVMTI CompiledMethodUnload event can be enabled or disabled at 1636 // any time. As the nmethod is being unloaded now we mark it has 1637 // having the unload event reported - this will ensure that we don't 1638 // attempt to report the event in the unlikely scenario where the 1639 // event is enabled at the time the nmethod is made a zombie. 1640 set_unload_reported(); 1641 } 1642 1643 // Iterate over metadata calling this function. Used by RedefineClasses 1644 void nmethod::metadata_do(MetadataClosure* f) { 1645 { 1646 // Visit all immediate references that are embedded in the instruction stream. 1647 RelocIterator iter(this, oops_reloc_begin()); 1648 while (iter.next()) { 1649 if (iter.type() == relocInfo::metadata_type) { 1650 metadata_Relocation* r = iter.metadata_reloc(); 1651 // In this metadata, we must only follow those metadatas directly embedded in 1652 // the code. Other metadatas (oop_index>0) are seen as part of 1653 // the metadata section below. 1654 assert(1 == (r->metadata_is_immediate()) + 1655 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()), 1656 "metadata must be found in exactly one place"); 1657 if (r->metadata_is_immediate() && r->metadata_value() != NULL) { 1658 Metadata* md = r->metadata_value(); 1659 if (md != _method) f->do_metadata(md); 1660 } 1661 } else if (iter.type() == relocInfo::virtual_call_type) { 1662 // Check compiledIC holders associated with this nmethod 1663 ResourceMark rm; 1664 CompiledIC *ic = CompiledIC_at(&iter); 1665 if (ic->is_icholder_call()) { 1666 CompiledICHolder* cichk = ic->cached_icholder(); 1667 f->do_metadata(cichk->holder_metadata()); 1668 f->do_metadata(cichk->holder_klass()); 1669 } else { 1670 Metadata* ic_oop = ic->cached_metadata(); 1671 if (ic_oop != NULL) { 1672 f->do_metadata(ic_oop); 1673 } 1674 } 1675 } 1676 } 1677 } 1678 1679 // Visit the metadata section 1680 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) { 1681 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops 1682 Metadata* md = *p; 1683 f->do_metadata(md); 1684 } 1685 1686 // Visit metadata not embedded in the other places. 1687 if (_method != NULL) f->do_metadata(_method); 1688 } 1689 1690 // The _is_unloading_state encodes a tuple comprising the unloading cycle 1691 // and the result of IsUnloadingBehaviour::is_unloading() fpr that cycle. 1692 // This is the bit layout of the _is_unloading_state byte: 00000CCU 1693 // CC refers to the cycle, which has 2 bits, and U refers to the result of 1694 // IsUnloadingBehaviour::is_unloading() for that unloading cycle. 1695 1696 class IsUnloadingState: public AllStatic { 1697 static const uint8_t _is_unloading_mask = 1; 1698 static const uint8_t _is_unloading_shift = 0; 1699 static const uint8_t _unloading_cycle_mask = 6; 1700 static const uint8_t _unloading_cycle_shift = 1; 1701 1702 static uint8_t set_is_unloading(uint8_t state, bool value) { 1703 state &= ~_is_unloading_mask; 1704 if (value) { 1705 state |= 1 << _is_unloading_shift; 1706 } 1707 assert(is_unloading(state) == value, "unexpected unloading cycle overflow"); 1708 return state; 1709 } 1710 1711 static uint8_t set_unloading_cycle(uint8_t state, uint8_t value) { 1712 state &= ~_unloading_cycle_mask; 1713 state |= value << _unloading_cycle_shift; 1714 assert(unloading_cycle(state) == value, "unexpected unloading cycle overflow"); 1715 return state; 1716 } 1717 1718 public: 1719 static bool is_unloading(uint8_t state) { return (state & _is_unloading_mask) >> _is_unloading_shift == 1; } 1720 static uint8_t unloading_cycle(uint8_t state) { return (state & _unloading_cycle_mask) >> _unloading_cycle_shift; } 1721 1722 static uint8_t create(bool is_unloading, uint8_t unloading_cycle) { 1723 uint8_t state = 0; 1724 state = set_is_unloading(state, is_unloading); 1725 state = set_unloading_cycle(state, unloading_cycle); 1726 return state; 1727 } 1728 }; 1729 1730 bool nmethod::is_unloading() { 1731 uint8_t state = RawAccess<MO_RELAXED>::load(&_is_unloading_state); 1732 bool state_is_unloading = IsUnloadingState::is_unloading(state); 1733 uint8_t state_unloading_cycle = IsUnloadingState::unloading_cycle(state); 1734 if (state_is_unloading) { 1735 return true; 1736 } 1737 uint8_t current_cycle = CodeCache::unloading_cycle(); 1738 if (state_unloading_cycle == current_cycle) { 1739 return false; 1740 } 1741 1742 // The IsUnloadingBehaviour is responsible for checking if there are any dead 1743 // oops in the CompiledMethod, by calling oops_do on it. 1744 state_unloading_cycle = current_cycle; 1745 1746 if (is_zombie()) { 1747 // Zombies without calculated unloading epoch are never unloading due to GC. 1748 1749 // There are no races where a previously observed is_unloading() nmethod 1750 // suddenly becomes not is_unloading() due to here being observed as zombie. 1751 1752 // With STW unloading, all is_alive() && is_unloading() nmethods are unlinked 1753 // and unloaded in the safepoint. That makes races where an nmethod is first 1754 // observed as is_alive() && is_unloading() and subsequently observed as 1755 // is_zombie() impossible. 1756 1757 // With concurrent unloading, all references to is_unloading() nmethods are 1758 // first unlinked (e.g. IC caches and dependency contexts). Then a global 1759 // handshake operation is performed with all JavaThreads before finally 1760 // unloading the nmethods. The sweeper never converts is_alive() && is_unloading() 1761 // nmethods to zombies; it waits for them to become is_unloaded(). So before 1762 // the global handshake, it is impossible for is_unloading() nmethods to 1763 // racingly become is_zombie(). And is_unloading() is calculated for all is_alive() 1764 // nmethods before taking that global handshake, meaning that it will never 1765 // be recalculated after the handshake. 1766 1767 // After that global handshake, is_unloading() nmethods are only observable 1768 // to the iterators, and they will never trigger recomputation of the cached 1769 // is_unloading_state, and hence may not suffer from such races. 1770 1771 state_is_unloading = false; 1772 } else { 1773 state_is_unloading = IsUnloadingBehaviour::current()->is_unloading(this); 1774 } 1775 1776 state = IsUnloadingState::create(state_is_unloading, state_unloading_cycle); 1777 1778 RawAccess<MO_RELAXED>::store(&_is_unloading_state, state); 1779 1780 return state_is_unloading; 1781 } 1782 1783 void nmethod::clear_unloading_state() { 1784 uint8_t state = IsUnloadingState::create(false, CodeCache::unloading_cycle()); 1785 RawAccess<MO_RELAXED>::store(&_is_unloading_state, state); 1786 } 1787 1788 1789 // This is called at the end of the strong tracing/marking phase of a 1790 // GC to unload an nmethod if it contains otherwise unreachable 1791 // oops. 1792 1793 void nmethod::do_unloading(bool unloading_occurred) { 1794 // Make sure the oop's ready to receive visitors 1795 assert(!is_zombie() && !is_unloaded(), 1796 "should not call follow on zombie or unloaded nmethod"); 1797 1798 if (is_unloading()) { 1799 make_unloaded(); 1800 } else { 1801 guarantee(unload_nmethod_caches(unloading_occurred), 1802 "Should not need transition stubs"); 1803 } 1804 } 1805 1806 void nmethod::oops_do(OopClosure* f, bool allow_dead) { 1807 // make sure the oops ready to receive visitors 1808 assert(allow_dead || is_alive(), "should not call follow on dead nmethod"); 1809 1810 // Prevent extra code cache walk for platforms that don't have immediate oops. 1811 if (relocInfo::mustIterateImmediateOopsInCode()) { 1812 RelocIterator iter(this, oops_reloc_begin()); 1813 1814 while (iter.next()) { 1815 if (iter.type() == relocInfo::oop_type ) { 1816 oop_Relocation* r = iter.oop_reloc(); 1817 // In this loop, we must only follow those oops directly embedded in 1818 // the code. Other oops (oop_index>0) are seen as part of scopes_oops. 1819 assert(1 == (r->oop_is_immediate()) + 1820 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 1821 "oop must be found in exactly one place"); 1822 if (r->oop_is_immediate() && r->oop_value() != NULL) { 1823 f->do_oop(r->oop_addr()); 1824 } 1825 } 1826 } 1827 } 1828 1829 // Scopes 1830 // This includes oop constants not inlined in the code stream. 1831 for (oop* p = oops_begin(); p < oops_end(); p++) { 1832 if (*p == Universe::non_oop_word()) continue; // skip non-oops 1833 f->do_oop(p); 1834 } 1835 } 1836 1837 #define NMETHOD_SENTINEL ((nmethod*)badAddress) 1838 1839 nmethod* volatile nmethod::_oops_do_mark_nmethods; 1840 1841 // An nmethod is "marked" if its _mark_link is set non-null. 1842 // Even if it is the end of the linked list, it will have a non-null link value, 1843 // as long as it is on the list. 1844 // This code must be MP safe, because it is used from parallel GC passes. 1845 bool nmethod::test_set_oops_do_mark() { 1846 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called"); 1847 if (_oops_do_mark_link == NULL) { 1848 // Claim this nmethod for this thread to mark. 1849 if (Atomic::replace_if_null(NMETHOD_SENTINEL, &_oops_do_mark_link)) { 1850 // Atomically append this nmethod (now claimed) to the head of the list: 1851 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods; 1852 for (;;) { 1853 nmethod* required_mark_nmethods = observed_mark_nmethods; 1854 _oops_do_mark_link = required_mark_nmethods; 1855 observed_mark_nmethods = 1856 Atomic::cmpxchg(this, &_oops_do_mark_nmethods, required_mark_nmethods); 1857 if (observed_mark_nmethods == required_mark_nmethods) 1858 break; 1859 } 1860 // Mark was clear when we first saw this guy. 1861 LogTarget(Trace, gc, nmethod) lt; 1862 if (lt.is_enabled()) { 1863 LogStream ls(lt); 1864 CompileTask::print(&ls, this, "oops_do, mark", /*short_form:*/ true); 1865 } 1866 return false; 1867 } 1868 } 1869 // On fall through, another racing thread marked this nmethod before we did. 1870 return true; 1871 } 1872 1873 void nmethod::oops_do_marking_prologue() { 1874 log_trace(gc, nmethod)("oops_do_marking_prologue"); 1875 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row"); 1876 // We use cmpxchg instead of regular assignment here because the user 1877 // may fork a bunch of threads, and we need them all to see the same state. 1878 nmethod* observed = Atomic::cmpxchg(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, (nmethod*)NULL); 1879 guarantee(observed == NULL, "no races in this sequential code"); 1880 } 1881 1882 void nmethod::oops_do_marking_epilogue() { 1883 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row"); 1884 nmethod* cur = _oops_do_mark_nmethods; 1885 while (cur != NMETHOD_SENTINEL) { 1886 assert(cur != NULL, "not NULL-terminated"); 1887 nmethod* next = cur->_oops_do_mark_link; 1888 cur->_oops_do_mark_link = NULL; 1889 DEBUG_ONLY(cur->verify_oop_relocations()); 1890 1891 LogTarget(Trace, gc, nmethod) lt; 1892 if (lt.is_enabled()) { 1893 LogStream ls(lt); 1894 CompileTask::print(&ls, cur, "oops_do, unmark", /*short_form:*/ true); 1895 } 1896 cur = next; 1897 } 1898 nmethod* required = _oops_do_mark_nmethods; 1899 nmethod* observed = Atomic::cmpxchg((nmethod*)NULL, &_oops_do_mark_nmethods, required); 1900 guarantee(observed == required, "no races in this sequential code"); 1901 log_trace(gc, nmethod)("oops_do_marking_epilogue"); 1902 } 1903 1904 inline bool includes(void* p, void* from, void* to) { 1905 return from <= p && p < to; 1906 } 1907 1908 1909 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) { 1910 assert(count >= 2, "must be sentinel values, at least"); 1911 1912 #ifdef ASSERT 1913 // must be sorted and unique; we do a binary search in find_pc_desc() 1914 int prev_offset = pcs[0].pc_offset(); 1915 assert(prev_offset == PcDesc::lower_offset_limit, 1916 "must start with a sentinel"); 1917 for (int i = 1; i < count; i++) { 1918 int this_offset = pcs[i].pc_offset(); 1919 assert(this_offset > prev_offset, "offsets must be sorted"); 1920 prev_offset = this_offset; 1921 } 1922 assert(prev_offset == PcDesc::upper_offset_limit, 1923 "must end with a sentinel"); 1924 #endif //ASSERT 1925 1926 // Search for MethodHandle invokes and tag the nmethod. 1927 for (int i = 0; i < count; i++) { 1928 if (pcs[i].is_method_handle_invoke()) { 1929 set_has_method_handle_invokes(true); 1930 break; 1931 } 1932 } 1933 assert(has_method_handle_invokes() == (_deopt_mh_handler_begin != NULL), "must have deopt mh handler"); 1934 1935 int size = count * sizeof(PcDesc); 1936 assert(scopes_pcs_size() >= size, "oob"); 1937 memcpy(scopes_pcs_begin(), pcs, size); 1938 1939 // Adjust the final sentinel downward. 1940 PcDesc* last_pc = &scopes_pcs_begin()[count-1]; 1941 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity"); 1942 last_pc->set_pc_offset(content_size() + 1); 1943 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) { 1944 // Fill any rounding gaps with copies of the last record. 1945 last_pc[1] = last_pc[0]; 1946 } 1947 // The following assert could fail if sizeof(PcDesc) is not 1948 // an integral multiple of oopSize (the rounding term). 1949 // If it fails, change the logic to always allocate a multiple 1950 // of sizeof(PcDesc), and fill unused words with copies of *last_pc. 1951 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly"); 1952 } 1953 1954 void nmethod::copy_scopes_data(u_char* buffer, int size) { 1955 assert(scopes_data_size() >= size, "oob"); 1956 memcpy(scopes_data_begin(), buffer, size); 1957 } 1958 1959 #ifdef ASSERT 1960 static PcDesc* linear_search(const PcDescSearch& search, int pc_offset, bool approximate) { 1961 PcDesc* lower = search.scopes_pcs_begin(); 1962 PcDesc* upper = search.scopes_pcs_end(); 1963 lower += 1; // exclude initial sentinel 1964 PcDesc* res = NULL; 1965 for (PcDesc* p = lower; p < upper; p++) { 1966 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc 1967 if (match_desc(p, pc_offset, approximate)) { 1968 if (res == NULL) 1969 res = p; 1970 else 1971 res = (PcDesc*) badAddress; 1972 } 1973 } 1974 return res; 1975 } 1976 #endif 1977 1978 1979 // Finds a PcDesc with real-pc equal to "pc" 1980 PcDesc* PcDescContainer::find_pc_desc_internal(address pc, bool approximate, const PcDescSearch& search) { 1981 address base_address = search.code_begin(); 1982 if ((pc < base_address) || 1983 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) { 1984 return NULL; // PC is wildly out of range 1985 } 1986 int pc_offset = (int) (pc - base_address); 1987 1988 // Check the PcDesc cache if it contains the desired PcDesc 1989 // (This as an almost 100% hit rate.) 1990 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate); 1991 if (res != NULL) { 1992 assert(res == linear_search(search, pc_offset, approximate), "cache ok"); 1993 return res; 1994 } 1995 1996 // Fallback algorithm: quasi-linear search for the PcDesc 1997 // Find the last pc_offset less than the given offset. 1998 // The successor must be the required match, if there is a match at all. 1999 // (Use a fixed radix to avoid expensive affine pointer arithmetic.) 2000 PcDesc* lower = search.scopes_pcs_begin(); 2001 PcDesc* upper = search.scopes_pcs_end(); 2002 upper -= 1; // exclude final sentinel 2003 if (lower >= upper) return NULL; // native method; no PcDescs at all 2004 2005 #define assert_LU_OK \ 2006 /* invariant on lower..upper during the following search: */ \ 2007 assert(lower->pc_offset() < pc_offset, "sanity"); \ 2008 assert(upper->pc_offset() >= pc_offset, "sanity") 2009 assert_LU_OK; 2010 2011 // Use the last successful return as a split point. 2012 PcDesc* mid = _pc_desc_cache.last_pc_desc(); 2013 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 2014 if (mid->pc_offset() < pc_offset) { 2015 lower = mid; 2016 } else { 2017 upper = mid; 2018 } 2019 2020 // Take giant steps at first (4096, then 256, then 16, then 1) 2021 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1); 2022 const int RADIX = (1 << LOG2_RADIX); 2023 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) { 2024 while ((mid = lower + step) < upper) { 2025 assert_LU_OK; 2026 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 2027 if (mid->pc_offset() < pc_offset) { 2028 lower = mid; 2029 } else { 2030 upper = mid; 2031 break; 2032 } 2033 } 2034 assert_LU_OK; 2035 } 2036 2037 // Sneak up on the value with a linear search of length ~16. 2038 while (true) { 2039 assert_LU_OK; 2040 mid = lower + 1; 2041 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 2042 if (mid->pc_offset() < pc_offset) { 2043 lower = mid; 2044 } else { 2045 upper = mid; 2046 break; 2047 } 2048 } 2049 #undef assert_LU_OK 2050 2051 if (match_desc(upper, pc_offset, approximate)) { 2052 assert(upper == linear_search(search, pc_offset, approximate), "search ok"); 2053 _pc_desc_cache.add_pc_desc(upper); 2054 return upper; 2055 } else { 2056 assert(NULL == linear_search(search, pc_offset, approximate), "search ok"); 2057 return NULL; 2058 } 2059 } 2060 2061 2062 void nmethod::check_all_dependencies(DepChange& changes) { 2063 // Checked dependencies are allocated into this ResourceMark 2064 ResourceMark rm; 2065 2066 // Turn off dependency tracing while actually testing dependencies. 2067 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) ); 2068 2069 typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash, 2070 &DependencySignature::equals, 11027> DepTable; 2071 2072 DepTable* table = new DepTable(); 2073 2074 // Iterate over live nmethods and check dependencies of all nmethods that are not 2075 // marked for deoptimization. A particular dependency is only checked once. 2076 NMethodIterator iter(NMethodIterator::only_alive_and_not_unloading); 2077 while(iter.next()) { 2078 nmethod* nm = iter.method(); 2079 // Only notify for live nmethods 2080 if (!nm->is_marked_for_deoptimization()) { 2081 for (Dependencies::DepStream deps(nm); deps.next(); ) { 2082 // Construct abstraction of a dependency. 2083 DependencySignature* current_sig = new DependencySignature(deps); 2084 2085 // Determine if dependency is already checked. table->put(...) returns 2086 // 'true' if the dependency is added (i.e., was not in the hashtable). 2087 if (table->put(*current_sig, 1)) { 2088 if (deps.check_dependency() != NULL) { 2089 // Dependency checking failed. Print out information about the failed 2090 // dependency and finally fail with an assert. We can fail here, since 2091 // dependency checking is never done in a product build. 2092 tty->print_cr("Failed dependency:"); 2093 changes.print(); 2094 nm->print(); 2095 nm->print_dependencies(); 2096 assert(false, "Should have been marked for deoptimization"); 2097 } 2098 } 2099 } 2100 } 2101 } 2102 } 2103 2104 bool nmethod::check_dependency_on(DepChange& changes) { 2105 // What has happened: 2106 // 1) a new class dependee has been added 2107 // 2) dependee and all its super classes have been marked 2108 bool found_check = false; // set true if we are upset 2109 for (Dependencies::DepStream deps(this); deps.next(); ) { 2110 // Evaluate only relevant dependencies. 2111 if (deps.spot_check_dependency_at(changes) != NULL) { 2112 found_check = true; 2113 NOT_DEBUG(break); 2114 } 2115 } 2116 return found_check; 2117 } 2118 2119 // Called from mark_for_deoptimization, when dependee is invalidated. 2120 bool nmethod::is_dependent_on_method(Method* dependee) { 2121 for (Dependencies::DepStream deps(this); deps.next(); ) { 2122 if (deps.type() != Dependencies::evol_method) 2123 continue; 2124 Method* method = deps.method_argument(0); 2125 if (method == dependee) return true; 2126 } 2127 return false; 2128 } 2129 2130 2131 bool nmethod::is_patchable_at(address instr_addr) { 2132 assert(insts_contains(instr_addr), "wrong nmethod used"); 2133 if (is_zombie()) { 2134 // a zombie may never be patched 2135 return false; 2136 } 2137 return true; 2138 } 2139 2140 2141 void nmethod_init() { 2142 // make sure you didn't forget to adjust the filler fields 2143 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word"); 2144 } 2145 2146 2147 //------------------------------------------------------------------------------------------- 2148 2149 2150 // QQQ might we make this work from a frame?? 2151 nmethodLocker::nmethodLocker(address pc) { 2152 CodeBlob* cb = CodeCache::find_blob(pc); 2153 guarantee(cb != NULL && cb->is_compiled(), "bad pc for a nmethod found"); 2154 _nm = cb->as_compiled_method(); 2155 lock_nmethod(_nm); 2156 } 2157 2158 // Only JvmtiDeferredEvent::compiled_method_unload_event() 2159 // should pass zombie_ok == true. 2160 void nmethodLocker::lock_nmethod(CompiledMethod* cm, bool zombie_ok) { 2161 if (cm == NULL) return; 2162 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method 2163 nmethod* nm = cm->as_nmethod(); 2164 Atomic::inc(&nm->_lock_count); 2165 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method: %p", nm); 2166 } 2167 2168 void nmethodLocker::unlock_nmethod(CompiledMethod* cm) { 2169 if (cm == NULL) return; 2170 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method 2171 nmethod* nm = cm->as_nmethod(); 2172 Atomic::dec(&nm->_lock_count); 2173 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock"); 2174 } 2175 2176 2177 // ----------------------------------------------------------------------------- 2178 // Verification 2179 2180 class VerifyOopsClosure: public OopClosure { 2181 nmethod* _nm; 2182 bool _ok; 2183 public: 2184 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { } 2185 bool ok() { return _ok; } 2186 virtual void do_oop(oop* p) { 2187 if (oopDesc::is_oop_or_null(*p)) return; 2188 // Print diagnostic information before calling print_nmethod(). 2189 // Assertions therein might prevent call from returning. 2190 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)", 2191 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm)); 2192 if (_ok) { 2193 _nm->print_nmethod(true); 2194 _ok = false; 2195 } 2196 } 2197 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2198 }; 2199 2200 void nmethod::verify() { 2201 2202 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant 2203 // seems odd. 2204 2205 if (is_zombie() || is_not_entrant() || is_unloaded()) 2206 return; 2207 2208 // Make sure all the entry points are correctly aligned for patching. 2209 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point()); 2210 2211 // assert(oopDesc::is_oop(method()), "must be valid"); 2212 2213 ResourceMark rm; 2214 2215 if (!CodeCache::contains(this)) { 2216 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this)); 2217 } 2218 2219 if(is_native_method() ) 2220 return; 2221 2222 nmethod* nm = CodeCache::find_nmethod(verified_entry_point()); 2223 if (nm != this) { 2224 fatal("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this)); 2225 } 2226 2227 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2228 if (! p->verify(this)) { 2229 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this)); 2230 } 2231 } 2232 2233 #ifdef ASSERT 2234 #if INCLUDE_JVMCI 2235 { 2236 // Verify that implicit exceptions that deoptimize have a PcDesc and OopMap 2237 ImmutableOopMapSet* oms = oop_maps(); 2238 ImplicitExceptionTable implicit_table(this); 2239 for (uint i = 0; i < implicit_table.len(); i++) { 2240 int exec_offset = (int) implicit_table.get_exec_offset(i); 2241 if (implicit_table.get_exec_offset(i) == implicit_table.get_cont_offset(i)) { 2242 assert(pc_desc_at(code_begin() + exec_offset) != NULL, "missing PcDesc"); 2243 bool found = false; 2244 for (int i = 0, imax = oms->count(); i < imax; i++) { 2245 if (oms->pair_at(i)->pc_offset() == exec_offset) { 2246 found = true; 2247 break; 2248 } 2249 } 2250 assert(found, "missing oopmap"); 2251 } 2252 } 2253 } 2254 #endif 2255 #endif 2256 2257 VerifyOopsClosure voc(this); 2258 oops_do(&voc); 2259 assert(voc.ok(), "embedded oops must be OK"); 2260 Universe::heap()->verify_nmethod(this); 2261 2262 verify_scopes(); 2263 } 2264 2265 2266 void nmethod::verify_interrupt_point(address call_site) { 2267 // Verify IC only when nmethod installation is finished. 2268 if (!is_not_installed()) { 2269 if (CompiledICLocker::is_safe(this)) { 2270 CompiledIC_at(this, call_site); 2271 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); 2272 } else { 2273 CompiledICLocker ml_verify(this); 2274 CompiledIC_at(this, call_site); 2275 } 2276 } 2277 2278 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address()); 2279 assert(pd != NULL, "PcDesc must exist"); 2280 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(), 2281 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(), 2282 pd->return_oop()); 2283 !sd->is_top(); sd = sd->sender()) { 2284 sd->verify(); 2285 } 2286 } 2287 2288 void nmethod::verify_scopes() { 2289 if( !method() ) return; // Runtime stubs have no scope 2290 if (method()->is_native()) return; // Ignore stub methods. 2291 // iterate through all interrupt point 2292 // and verify the debug information is valid. 2293 RelocIterator iter((nmethod*)this); 2294 while (iter.next()) { 2295 address stub = NULL; 2296 switch (iter.type()) { 2297 case relocInfo::virtual_call_type: 2298 verify_interrupt_point(iter.addr()); 2299 break; 2300 case relocInfo::opt_virtual_call_type: 2301 stub = iter.opt_virtual_call_reloc()->static_stub(false); 2302 verify_interrupt_point(iter.addr()); 2303 break; 2304 case relocInfo::static_call_type: 2305 stub = iter.static_call_reloc()->static_stub(false); 2306 //verify_interrupt_point(iter.addr()); 2307 break; 2308 case relocInfo::runtime_call_type: 2309 case relocInfo::runtime_call_w_cp_type: { 2310 address destination = iter.reloc()->value(); 2311 // Right now there is no way to find out which entries support 2312 // an interrupt point. It would be nice if we had this 2313 // information in a table. 2314 break; 2315 } 2316 default: 2317 break; 2318 } 2319 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section"); 2320 } 2321 } 2322 2323 2324 // ----------------------------------------------------------------------------- 2325 // Printing operations 2326 2327 void nmethod::print() const { 2328 ttyLocker ttyl; // keep the following output all in one block 2329 print(tty); 2330 } 2331 2332 void nmethod::print(outputStream* st) const { 2333 ResourceMark rm; 2334 2335 st->print("Compiled method "); 2336 2337 if (is_compiled_by_c1()) { 2338 st->print("(c1) "); 2339 } else if (is_compiled_by_c2()) { 2340 st->print("(c2) "); 2341 } else if (is_compiled_by_jvmci()) { 2342 st->print("(JVMCI) "); 2343 } else { 2344 st->print("(n/a) "); 2345 } 2346 2347 print_on(tty, NULL); 2348 2349 if (WizardMode) { 2350 st->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this)); 2351 st->print(" for method " INTPTR_FORMAT , p2i(method())); 2352 st->print(" { "); 2353 st->print_cr("%s ", state()); 2354 st->print_cr("}:"); 2355 } 2356 if (size () > 0) st->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2357 p2i(this), 2358 p2i(this) + size(), 2359 size()); 2360 if (relocation_size () > 0) st->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2361 p2i(relocation_begin()), 2362 p2i(relocation_end()), 2363 relocation_size()); 2364 if (consts_size () > 0) st->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2365 p2i(consts_begin()), 2366 p2i(consts_end()), 2367 consts_size()); 2368 if (insts_size () > 0) st->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2369 p2i(insts_begin()), 2370 p2i(insts_end()), 2371 insts_size()); 2372 if (stub_size () > 0) st->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2373 p2i(stub_begin()), 2374 p2i(stub_end()), 2375 stub_size()); 2376 if (oops_size () > 0) st->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2377 p2i(oops_begin()), 2378 p2i(oops_end()), 2379 oops_size()); 2380 if (metadata_size () > 0) st->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2381 p2i(metadata_begin()), 2382 p2i(metadata_end()), 2383 metadata_size()); 2384 if (scopes_data_size () > 0) st->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2385 p2i(scopes_data_begin()), 2386 p2i(scopes_data_end()), 2387 scopes_data_size()); 2388 if (scopes_pcs_size () > 0) st->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2389 p2i(scopes_pcs_begin()), 2390 p2i(scopes_pcs_end()), 2391 scopes_pcs_size()); 2392 if (dependencies_size () > 0) st->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2393 p2i(dependencies_begin()), 2394 p2i(dependencies_end()), 2395 dependencies_size()); 2396 if (handler_table_size() > 0) st->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2397 p2i(handler_table_begin()), 2398 p2i(handler_table_end()), 2399 handler_table_size()); 2400 if (nul_chk_table_size() > 0) st->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2401 p2i(nul_chk_table_begin()), 2402 p2i(nul_chk_table_end()), 2403 nul_chk_table_size()); 2404 #if INCLUDE_JVMCI 2405 if (speculations_size () > 0) st->print_cr(" speculations [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2406 p2i(speculations_begin()), 2407 p2i(speculations_end()), 2408 speculations_size()); 2409 if (jvmci_data_size () > 0) st->print_cr(" JVMCI data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2410 p2i(jvmci_data_begin()), 2411 p2i(jvmci_data_end()), 2412 jvmci_data_size()); 2413 #endif 2414 } 2415 2416 void nmethod::print_code() { 2417 HandleMark hm; 2418 ResourceMark m; 2419 ttyLocker ttyl; 2420 // Call the specialized decode method of this class. 2421 decode(tty); 2422 } 2423 2424 #ifndef PRODUCT // called InstanceKlass methods are available only then. Declared as PRODUCT_RETURN 2425 2426 void nmethod::print_dependencies() { 2427 ResourceMark rm; 2428 ttyLocker ttyl; // keep the following output all in one block 2429 tty->print_cr("Dependencies:"); 2430 for (Dependencies::DepStream deps(this); deps.next(); ) { 2431 deps.print_dependency(); 2432 Klass* ctxk = deps.context_type(); 2433 if (ctxk != NULL) { 2434 if (ctxk->is_instance_klass() && InstanceKlass::cast(ctxk)->is_dependent_nmethod(this)) { 2435 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name()); 2436 } 2437 } 2438 deps.log_dependency(); // put it into the xml log also 2439 } 2440 } 2441 #endif 2442 2443 #if defined(SUPPORT_DATA_STRUCTS) 2444 2445 // Print the oops from the underlying CodeBlob. 2446 void nmethod::print_oops(outputStream* st) { 2447 HandleMark hm; 2448 ResourceMark m; 2449 st->print("Oops:"); 2450 if (oops_begin() < oops_end()) { 2451 st->cr(); 2452 for (oop* p = oops_begin(); p < oops_end(); p++) { 2453 Disassembler::print_location((unsigned char*)p, (unsigned char*)oops_begin(), (unsigned char*)oops_end(), st, true, false); 2454 st->print(PTR_FORMAT " ", *((uintptr_t*)p)); 2455 if (*p == Universe::non_oop_word()) { 2456 st->print_cr("NON_OOP"); 2457 continue; // skip non-oops 2458 } 2459 if (*p == NULL) { 2460 st->print_cr("NULL-oop"); 2461 continue; // skip non-oops 2462 } 2463 (*p)->print_value_on(st); 2464 st->cr(); 2465 } 2466 } else { 2467 st->print_cr(" <list empty>"); 2468 } 2469 } 2470 2471 // Print metadata pool. 2472 void nmethod::print_metadata(outputStream* st) { 2473 HandleMark hm; 2474 ResourceMark m; 2475 st->print("Metadata:"); 2476 if (metadata_begin() < metadata_end()) { 2477 st->cr(); 2478 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) { 2479 Disassembler::print_location((unsigned char*)p, (unsigned char*)metadata_begin(), (unsigned char*)metadata_end(), st, true, false); 2480 st->print(PTR_FORMAT " ", *((uintptr_t*)p)); 2481 if (*p && *p != Universe::non_oop_word()) { 2482 (*p)->print_value_on(st); 2483 } 2484 st->cr(); 2485 } 2486 } else { 2487 st->print_cr(" <list empty>"); 2488 } 2489 } 2490 2491 #ifndef PRODUCT // ScopeDesc::print_on() is available only then. Declared as PRODUCT_RETURN 2492 void nmethod::print_scopes_on(outputStream* st) { 2493 // Find the first pc desc for all scopes in the code and print it. 2494 ResourceMark rm; 2495 st->print("scopes:"); 2496 if (scopes_pcs_begin() < scopes_pcs_end()) { 2497 st->cr(); 2498 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2499 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null) 2500 continue; 2501 2502 ScopeDesc* sd = scope_desc_at(p->real_pc(this)); 2503 while (sd != NULL) { 2504 sd->print_on(st, p); // print output ends with a newline 2505 sd = sd->sender(); 2506 } 2507 } 2508 } else { 2509 st->print_cr(" <list empty>"); 2510 } 2511 } 2512 #endif 2513 2514 #ifndef PRODUCT // RelocIterator does support printing only then. 2515 void nmethod::print_relocations() { 2516 ResourceMark m; // in case methods get printed via the debugger 2517 tty->print_cr("relocations:"); 2518 RelocIterator iter(this); 2519 iter.print(); 2520 } 2521 #endif 2522 2523 void nmethod::print_pcs_on(outputStream* st) { 2524 ResourceMark m; // in case methods get printed via debugger 2525 st->print("pc-bytecode offsets:"); 2526 if (scopes_pcs_begin() < scopes_pcs_end()) { 2527 st->cr(); 2528 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2529 p->print_on(st, this); // print output ends with a newline 2530 } 2531 } else { 2532 st->print_cr(" <list empty>"); 2533 } 2534 } 2535 2536 void nmethod::print_handler_table() { 2537 ExceptionHandlerTable(this).print(); 2538 } 2539 2540 void nmethod::print_nul_chk_table() { 2541 ImplicitExceptionTable(this).print(code_begin()); 2542 } 2543 2544 void nmethod::print_recorded_oops() { 2545 const int n = oops_count(); 2546 const int log_n = (n<10) ? 1 : (n<100) ? 2 : (n<1000) ? 3 : (n<10000) ? 4 : 6; 2547 tty->print("Recorded oops:"); 2548 if (n > 0) { 2549 tty->cr(); 2550 for (int i = 0; i < n; i++) { 2551 oop o = oop_at(i); 2552 tty->print("#%*d: " INTPTR_FORMAT " ", log_n, i, p2i(o)); 2553 if (o == (oop)Universe::non_oop_word()) { 2554 tty->print("non-oop word"); 2555 } else if (o == NULL) { 2556 tty->print("NULL-oop"); 2557 } else { 2558 o->print_value_on(tty); 2559 } 2560 tty->cr(); 2561 } 2562 } else { 2563 tty->print_cr(" <list empty>"); 2564 } 2565 } 2566 2567 void nmethod::print_recorded_metadata() { 2568 const int n = metadata_count(); 2569 const int log_n = (n<10) ? 1 : (n<100) ? 2 : (n<1000) ? 3 : (n<10000) ? 4 : 6; 2570 tty->print("Recorded metadata:"); 2571 if (n > 0) { 2572 tty->cr(); 2573 for (int i = 0; i < n; i++) { 2574 Metadata* m = metadata_at(i); 2575 tty->print("#%*d: " INTPTR_FORMAT " ", log_n, i, p2i(m)); 2576 if (m == (Metadata*)Universe::non_oop_word()) { 2577 tty->print("non-metadata word"); 2578 } else if (m == NULL) { 2579 tty->print("NULL-oop"); 2580 } else { 2581 Metadata::print_value_on_maybe_null(tty, m); 2582 } 2583 tty->cr(); 2584 } 2585 } else { 2586 tty->print_cr(" <list empty>"); 2587 } 2588 } 2589 #endif 2590 2591 #if defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_ABSTRACT_ASSEMBLY) 2592 2593 void nmethod::print_constant_pool(outputStream* st) { 2594 //----------------------------------- 2595 //---< Print the constant pool >--- 2596 //----------------------------------- 2597 int consts_size = this->consts_size(); 2598 if ( consts_size > 0 ) { 2599 unsigned char* cstart = this->consts_begin(); 2600 unsigned char* cp = cstart; 2601 unsigned char* cend = cp + consts_size; 2602 unsigned int bytes_per_line = 4; 2603 unsigned int CP_alignment = 8; 2604 unsigned int n; 2605 2606 st->cr(); 2607 2608 //---< print CP header to make clear what's printed >--- 2609 if( ((uintptr_t)cp&(CP_alignment-1)) == 0 ) { 2610 n = bytes_per_line; 2611 st->print_cr("[Constant Pool]"); 2612 Disassembler::print_location(cp, cstart, cend, st, true, true); 2613 Disassembler::print_hexdata(cp, n, st, true); 2614 st->cr(); 2615 } else { 2616 n = (uintptr_t)cp&(bytes_per_line-1); 2617 st->print_cr("[Constant Pool (unaligned)]"); 2618 } 2619 2620 //---< print CP contents, bytes_per_line at a time >--- 2621 while (cp < cend) { 2622 Disassembler::print_location(cp, cstart, cend, st, true, false); 2623 Disassembler::print_hexdata(cp, n, st, false); 2624 cp += n; 2625 n = bytes_per_line; 2626 st->cr(); 2627 } 2628 2629 //---< Show potential alignment gap between constant pool and code >--- 2630 cend = code_begin(); 2631 if( cp < cend ) { 2632 n = 4; 2633 st->print_cr("[Code entry alignment]"); 2634 while (cp < cend) { 2635 Disassembler::print_location(cp, cstart, cend, st, false, false); 2636 cp += n; 2637 st->cr(); 2638 } 2639 } 2640 } else { 2641 st->print_cr("[Constant Pool (empty)]"); 2642 } 2643 st->cr(); 2644 } 2645 2646 #endif 2647 2648 // Disassemble this nmethod. 2649 // Print additional debug information, if requested. This could be code 2650 // comments, block comments, profiling counters, etc. 2651 // The undisassembled format is useful no disassembler library is available. 2652 // The resulting hex dump (with markers) can be disassembled later, or on 2653 // another system, when/where a disassembler library is available. 2654 void nmethod::decode2(outputStream* ost) const { 2655 2656 // Called from frame::back_trace_with_decode without ResourceMark. 2657 ResourceMark rm; 2658 2659 // Make sure we have a valid stream to print on. 2660 outputStream* st = ost ? ost : tty; 2661 2662 #if defined(SUPPORT_ABSTRACT_ASSEMBLY) && ! defined(SUPPORT_ASSEMBLY) 2663 const bool use_compressed_format = true; 2664 const bool compressed_with_comments = use_compressed_format && (AbstractDisassembler::show_comment() || 2665 AbstractDisassembler::show_block_comment()); 2666 #else 2667 const bool use_compressed_format = Disassembler::is_abstract(); 2668 const bool compressed_with_comments = use_compressed_format && (AbstractDisassembler::show_comment() || 2669 AbstractDisassembler::show_block_comment()); 2670 #endif 2671 2672 st->cr(); 2673 this->print(st); 2674 st->cr(); 2675 2676 #if defined(SUPPORT_ASSEMBLY) 2677 //---------------------------------- 2678 //---< Print real disassembly >--- 2679 //---------------------------------- 2680 if (! use_compressed_format) { 2681 Disassembler::decode(const_cast<nmethod*>(this), st); 2682 return; 2683 } 2684 #endif 2685 2686 #if defined(SUPPORT_ABSTRACT_ASSEMBLY) 2687 2688 // Compressed undisassembled disassembly format. 2689 // The following stati are defined/supported: 2690 // = 0 - currently at bol() position, nothing printed yet on current line. 2691 // = 1 - currently at position after print_location(). 2692 // > 1 - in the midst of printing instruction stream bytes. 2693 int compressed_format_idx = 0; 2694 int code_comment_column = 0; 2695 const int instr_maxlen = Assembler::instr_maxlen(); 2696 const uint tabspacing = 8; 2697 unsigned char* start = this->code_begin(); 2698 unsigned char* p = this->code_begin(); 2699 unsigned char* end = this->code_end(); 2700 unsigned char* pss = p; // start of a code section (used for offsets) 2701 2702 if ((start == NULL) || (end == NULL)) { 2703 st->print_cr("PrintAssembly not possible due to uninitialized section pointers"); 2704 return; 2705 } 2706 #endif 2707 2708 #if defined(SUPPORT_ABSTRACT_ASSEMBLY) 2709 //---< plain abstract disassembly, no comments or anything, just section headers >--- 2710 if (use_compressed_format && ! compressed_with_comments) { 2711 const_cast<nmethod*>(this)->print_constant_pool(st); 2712 2713 //---< Open the output (Marker for post-mortem disassembler) >--- 2714 st->print_cr("[MachCode]"); 2715 const char* header = NULL; 2716 address p0 = p; 2717 while (p < end) { 2718 address pp = p; 2719 while ((p < end) && (header == NULL)) { 2720 header = nmethod_section_label(p); 2721 pp = p; 2722 p += Assembler::instr_len(p); 2723 } 2724 if (pp > p0) { 2725 AbstractDisassembler::decode_range_abstract(p0, pp, start, end, st, Assembler::instr_maxlen()); 2726 p0 = pp; 2727 p = pp; 2728 header = NULL; 2729 } else if (header != NULL) { 2730 st->bol(); 2731 st->print_cr("%s", header); 2732 header = NULL; 2733 } 2734 } 2735 //---< Close the output (Marker for post-mortem disassembler) >--- 2736 st->bol(); 2737 st->print_cr("[/MachCode]"); 2738 return; 2739 } 2740 #endif 2741 2742 #if defined(SUPPORT_ABSTRACT_ASSEMBLY) 2743 //---< abstract disassembly with comments and section headers merged in >--- 2744 if (compressed_with_comments) { 2745 const_cast<nmethod*>(this)->print_constant_pool(st); 2746 2747 //---< Open the output (Marker for post-mortem disassembler) >--- 2748 st->print_cr("[MachCode]"); 2749 while ((p < end) && (p != NULL)) { 2750 const int instruction_size_in_bytes = Assembler::instr_len(p); 2751 2752 //---< Block comments for nmethod. Interrupts instruction stream, if any. >--- 2753 // Outputs a bol() before and a cr() after, but only if a comment is printed. 2754 // Prints nmethod_section_label as well. 2755 if (AbstractDisassembler::show_block_comment()) { 2756 print_block_comment(st, p); 2757 if (st->position() == 0) { 2758 compressed_format_idx = 0; 2759 } 2760 } 2761 2762 //---< New location information after line break >--- 2763 if (compressed_format_idx == 0) { 2764 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false); 2765 compressed_format_idx = 1; 2766 } 2767 2768 //---< Code comment for current instruction. Address range [p..(p+len)) >--- 2769 unsigned char* p_end = p + (ssize_t)instruction_size_in_bytes; 2770 S390_ONLY(if (p_end > end) p_end = end;) // avoid getting past the end 2771 2772 if (AbstractDisassembler::show_comment() && const_cast<nmethod*>(this)->has_code_comment(p, p_end)) { 2773 //---< interrupt instruction byte stream for code comment >--- 2774 if (compressed_format_idx > 1) { 2775 st->cr(); // interrupt byte stream 2776 st->cr(); // add an empty line 2777 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false); 2778 } 2779 const_cast<nmethod*>(this)->print_code_comment_on(st, code_comment_column, p, p_end ); 2780 st->bol(); 2781 compressed_format_idx = 0; 2782 } 2783 2784 //---< New location information after line break >--- 2785 if (compressed_format_idx == 0) { 2786 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false); 2787 compressed_format_idx = 1; 2788 } 2789 2790 //---< Nicely align instructions for readability >--- 2791 if (compressed_format_idx > 1) { 2792 Disassembler::print_delimiter(st); 2793 } 2794 2795 //---< Now, finally, print the actual instruction bytes >--- 2796 unsigned char* p0 = p; 2797 p = Disassembler::decode_instruction_abstract(p, st, instruction_size_in_bytes, instr_maxlen); 2798 compressed_format_idx += p - p0; 2799 2800 if (Disassembler::start_newline(compressed_format_idx-1)) { 2801 st->cr(); 2802 compressed_format_idx = 0; 2803 } 2804 } 2805 //---< Close the output (Marker for post-mortem disassembler) >--- 2806 st->bol(); 2807 st->print_cr("[/MachCode]"); 2808 return; 2809 } 2810 #endif 2811 } 2812 2813 #if defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_ABSTRACT_ASSEMBLY) 2814 2815 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) { 2816 RelocIterator iter(this, begin, end); 2817 bool have_one = false; 2818 while (iter.next()) { 2819 have_one = true; 2820 switch (iter.type()) { 2821 case relocInfo::none: return "no_reloc"; 2822 case relocInfo::oop_type: { 2823 // Get a non-resizable resource-allocated stringStream. 2824 // Our callees make use of (nested) ResourceMarks. 2825 stringStream st(NEW_RESOURCE_ARRAY(char, 1024), 1024); 2826 oop_Relocation* r = iter.oop_reloc(); 2827 oop obj = r->oop_value(); 2828 st.print("oop("); 2829 if (obj == NULL) st.print("NULL"); 2830 else obj->print_value_on(&st); 2831 st.print(")"); 2832 return st.as_string(); 2833 } 2834 case relocInfo::metadata_type: { 2835 stringStream st; 2836 metadata_Relocation* r = iter.metadata_reloc(); 2837 Metadata* obj = r->metadata_value(); 2838 st.print("metadata("); 2839 if (obj == NULL) st.print("NULL"); 2840 else obj->print_value_on(&st); 2841 st.print(")"); 2842 return st.as_string(); 2843 } 2844 case relocInfo::runtime_call_type: 2845 case relocInfo::runtime_call_w_cp_type: { 2846 stringStream st; 2847 st.print("runtime_call"); 2848 CallRelocation* r = (CallRelocation*)iter.reloc(); 2849 address dest = r->destination(); 2850 CodeBlob* cb = CodeCache::find_blob(dest); 2851 if (cb != NULL) { 2852 st.print(" %s", cb->name()); 2853 } else { 2854 ResourceMark rm; 2855 const int buflen = 1024; 2856 char* buf = NEW_RESOURCE_ARRAY(char, buflen); 2857 int offset; 2858 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) { 2859 st.print(" %s", buf); 2860 if (offset != 0) { 2861 st.print("+%d", offset); 2862 } 2863 } 2864 } 2865 return st.as_string(); 2866 } 2867 case relocInfo::virtual_call_type: { 2868 stringStream st; 2869 st.print_raw("virtual_call"); 2870 virtual_call_Relocation* r = iter.virtual_call_reloc(); 2871 Method* m = r->method_value(); 2872 if (m != NULL) { 2873 assert(m->is_method(), ""); 2874 m->print_short_name(&st); 2875 } 2876 return st.as_string(); 2877 } 2878 case relocInfo::opt_virtual_call_type: { 2879 stringStream st; 2880 st.print_raw("optimized virtual_call"); 2881 opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc(); 2882 Method* m = r->method_value(); 2883 if (m != NULL) { 2884 assert(m->is_method(), ""); 2885 m->print_short_name(&st); 2886 } 2887 return st.as_string(); 2888 } 2889 case relocInfo::static_call_type: { 2890 stringStream st; 2891 st.print_raw("static_call"); 2892 static_call_Relocation* r = iter.static_call_reloc(); 2893 Method* m = r->method_value(); 2894 if (m != NULL) { 2895 assert(m->is_method(), ""); 2896 m->print_short_name(&st); 2897 } 2898 return st.as_string(); 2899 } 2900 case relocInfo::static_stub_type: return "static_stub"; 2901 case relocInfo::external_word_type: return "external_word"; 2902 case relocInfo::internal_word_type: return "internal_word"; 2903 case relocInfo::section_word_type: return "section_word"; 2904 case relocInfo::poll_type: return "poll"; 2905 case relocInfo::poll_return_type: return "poll_return"; 2906 case relocInfo::trampoline_stub_type: return "trampoline_stub"; 2907 case relocInfo::type_mask: return "type_bit_mask"; 2908 2909 default: 2910 break; 2911 } 2912 } 2913 return have_one ? "other" : NULL; 2914 } 2915 2916 // Return a the last scope in (begin..end] 2917 ScopeDesc* nmethod::scope_desc_in(address begin, address end) { 2918 PcDesc* p = pc_desc_near(begin+1); 2919 if (p != NULL && p->real_pc(this) <= end) { 2920 return new ScopeDesc(this, p->scope_decode_offset(), 2921 p->obj_decode_offset(), p->should_reexecute(), p->rethrow_exception(), 2922 p->return_oop()); 2923 } 2924 return NULL; 2925 } 2926 2927 const char* nmethod::nmethod_section_label(address pos) const { 2928 const char* label = NULL; 2929 if (pos == code_begin()) label = "[Instructions begin]"; 2930 if (pos == entry_point()) label = "[Entry Point]"; 2931 if (pos == verified_entry_point()) label = "[Verified Entry Point]"; 2932 if (has_method_handle_invokes() && (pos == deopt_mh_handler_begin())) label = "[Deopt MH Handler Code]"; 2933 if (pos == consts_begin() && pos != insts_begin()) label = "[Constants]"; 2934 // Check stub_code before checking exception_handler or deopt_handler. 2935 if (pos == this->stub_begin()) label = "[Stub Code]"; 2936 if (JVMCI_ONLY(_exception_offset >= 0 &&) pos == exception_begin()) label = "[Exception Handler]"; 2937 if (JVMCI_ONLY(_deopt_handler_begin != NULL &&) pos == deopt_handler_begin()) label = "[Deopt Handler Code]"; 2938 return label; 2939 } 2940 2941 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin, bool print_section_labels) const { 2942 if (print_section_labels) { 2943 const char* label = nmethod_section_label(block_begin); 2944 if (label != NULL) { 2945 stream->bol(); 2946 stream->print_cr("%s", label); 2947 } 2948 } 2949 2950 if (block_begin == entry_point()) { 2951 methodHandle m = method(); 2952 if (m.not_null()) { 2953 stream->print(" # "); 2954 m->print_value_on(stream); 2955 stream->cr(); 2956 } 2957 if (m.not_null() && !is_osr_method()) { 2958 ResourceMark rm; 2959 int sizeargs = m->size_of_parameters(); 2960 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs); 2961 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs); 2962 { 2963 int sig_index = 0; 2964 if (!m->is_static()) 2965 sig_bt[sig_index++] = T_OBJECT; // 'this' 2966 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) { 2967 BasicType t = ss.type(); 2968 sig_bt[sig_index++] = t; 2969 if (type2size[t] == 2) { 2970 sig_bt[sig_index++] = T_VOID; 2971 } else { 2972 assert(type2size[t] == 1, "size is 1 or 2"); 2973 } 2974 } 2975 assert(sig_index == sizeargs, ""); 2976 } 2977 const char* spname = "sp"; // make arch-specific? 2978 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false); 2979 int stack_slot_offset = this->frame_size() * wordSize; 2980 int tab1 = 14, tab2 = 24; 2981 int sig_index = 0; 2982 int arg_index = (m->is_static() ? 0 : -1); 2983 bool did_old_sp = false; 2984 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) { 2985 bool at_this = (arg_index == -1); 2986 bool at_old_sp = false; 2987 BasicType t = (at_this ? T_OBJECT : ss.type()); 2988 assert(t == sig_bt[sig_index], "sigs in sync"); 2989 if (at_this) 2990 stream->print(" # this: "); 2991 else 2992 stream->print(" # parm%d: ", arg_index); 2993 stream->move_to(tab1); 2994 VMReg fst = regs[sig_index].first(); 2995 VMReg snd = regs[sig_index].second(); 2996 if (fst->is_reg()) { 2997 stream->print("%s", fst->name()); 2998 if (snd->is_valid()) { 2999 stream->print(":%s", snd->name()); 3000 } 3001 } else if (fst->is_stack()) { 3002 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset; 3003 if (offset == stack_slot_offset) at_old_sp = true; 3004 stream->print("[%s+0x%x]", spname, offset); 3005 } else { 3006 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd); 3007 } 3008 stream->print(" "); 3009 stream->move_to(tab2); 3010 stream->print("= "); 3011 if (at_this) { 3012 m->method_holder()->print_value_on(stream); 3013 } else { 3014 bool did_name = false; 3015 if (!at_this && ss.is_object()) { 3016 Symbol* name = ss.as_symbol_or_null(); 3017 if (name != NULL) { 3018 name->print_value_on(stream); 3019 did_name = true; 3020 } 3021 } 3022 if (!did_name) 3023 stream->print("%s", type2name(t)); 3024 } 3025 if (at_old_sp) { 3026 stream->print(" (%s of caller)", spname); 3027 did_old_sp = true; 3028 } 3029 stream->cr(); 3030 sig_index += type2size[t]; 3031 arg_index += 1; 3032 if (!at_this) ss.next(); 3033 } 3034 if (!did_old_sp) { 3035 stream->print(" # "); 3036 stream->move_to(tab1); 3037 stream->print("[%s+0x%x]", spname, stack_slot_offset); 3038 stream->print(" (%s of caller)", spname); 3039 stream->cr(); 3040 } 3041 } 3042 } 3043 } 3044 3045 // Returns whether this nmethod has code comments. 3046 bool nmethod::has_code_comment(address begin, address end) { 3047 // scopes? 3048 ScopeDesc* sd = scope_desc_in(begin, end); 3049 if (sd != NULL) return true; 3050 3051 // relocations? 3052 const char* str = reloc_string_for(begin, end); 3053 if (str != NULL) return true; 3054 3055 // implicit exceptions? 3056 int cont_offset = ImplicitExceptionTable(this).continuation_offset(begin - code_begin()); 3057 if (cont_offset != 0) return true; 3058 3059 return false; 3060 } 3061 3062 void nmethod::print_code_comment_on(outputStream* st, int column, address begin, address end) { 3063 ImplicitExceptionTable implicit_table(this); 3064 int pc_offset = begin - code_begin(); 3065 int cont_offset = implicit_table.continuation_offset(pc_offset); 3066 bool oop_map_required = false; 3067 if (cont_offset != 0) { 3068 st->move_to(column, 6, 0); 3069 if (pc_offset == cont_offset) { 3070 st->print("; implicit exception: deoptimizes"); 3071 oop_map_required = true; 3072 } else { 3073 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset)); 3074 } 3075 } 3076 3077 // Find an oopmap in (begin, end]. We use the odd half-closed 3078 // interval so that oop maps and scope descs which are tied to the 3079 // byte after a call are printed with the call itself. OopMaps 3080 // associated with implicit exceptions are printed with the implicit 3081 // instruction. 3082 address base = code_begin(); 3083 ImmutableOopMapSet* oms = oop_maps(); 3084 if (oms != NULL) { 3085 for (int i = 0, imax = oms->count(); i < imax; i++) { 3086 const ImmutableOopMapPair* pair = oms->pair_at(i); 3087 const ImmutableOopMap* om = pair->get_from(oms); 3088 address pc = base + pair->pc_offset(); 3089 if (pc >= begin) { 3090 #if INCLUDE_JVMCI 3091 bool is_implicit_deopt = implicit_table.continuation_offset(pair->pc_offset()) == (uint) pair->pc_offset(); 3092 #else 3093 bool is_implicit_deopt = false; 3094 #endif 3095 if (is_implicit_deopt ? pc == begin : pc > begin && pc <= end) { 3096 st->move_to(column, 6, 0); 3097 st->print("; "); 3098 om->print_on(st); 3099 oop_map_required = false; 3100 } 3101 } 3102 if (pc > end) { 3103 break; 3104 } 3105 } 3106 } 3107 assert(!oop_map_required, "missed oopmap"); 3108 3109 // Print any debug info present at this pc. 3110 ScopeDesc* sd = scope_desc_in(begin, end); 3111 if (sd != NULL) { 3112 st->move_to(column, 6, 0); 3113 if (sd->bci() == SynchronizationEntryBCI) { 3114 st->print(";*synchronization entry"); 3115 } else if (sd->bci() == AfterBci) { 3116 st->print(";* method exit (unlocked if synchronized)"); 3117 } else if (sd->bci() == UnwindBci) { 3118 st->print(";* unwind (locked if synchronized)"); 3119 } else if (sd->bci() == AfterExceptionBci) { 3120 st->print(";* unwind (unlocked if synchronized)"); 3121 } else if (sd->bci() == UnknownBci) { 3122 st->print(";* unknown"); 3123 } else if (sd->bci() == InvalidFrameStateBci) { 3124 st->print(";* invalid frame state"); 3125 } else { 3126 if (sd->method() == NULL) { 3127 st->print("method is NULL"); 3128 } else if (sd->method()->is_native()) { 3129 st->print("method is native"); 3130 } else { 3131 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci()); 3132 st->print(";*%s", Bytecodes::name(bc)); 3133 switch (bc) { 3134 case Bytecodes::_invokevirtual: 3135 case Bytecodes::_invokespecial: 3136 case Bytecodes::_invokestatic: 3137 case Bytecodes::_invokeinterface: 3138 { 3139 Bytecode_invoke invoke(sd->method(), sd->bci()); 3140 st->print(" "); 3141 if (invoke.name() != NULL) 3142 invoke.name()->print_symbol_on(st); 3143 else 3144 st->print("<UNKNOWN>"); 3145 break; 3146 } 3147 case Bytecodes::_getfield: 3148 case Bytecodes::_putfield: 3149 case Bytecodes::_getstatic: 3150 case Bytecodes::_putstatic: 3151 { 3152 Bytecode_field field(sd->method(), sd->bci()); 3153 st->print(" "); 3154 if (field.name() != NULL) 3155 field.name()->print_symbol_on(st); 3156 else 3157 st->print("<UNKNOWN>"); 3158 } 3159 default: 3160 break; 3161 } 3162 } 3163 st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop()); 3164 } 3165 3166 // Print all scopes 3167 for (;sd != NULL; sd = sd->sender()) { 3168 st->move_to(column, 6, 0); 3169 st->print("; -"); 3170 if (sd->should_reexecute()) { 3171 st->print(" (reexecute)"); 3172 } 3173 if (sd->method() == NULL) { 3174 st->print("method is NULL"); 3175 } else { 3176 sd->method()->print_short_name(st); 3177 } 3178 int lineno = sd->method()->line_number_from_bci(sd->bci()); 3179 if (lineno != -1) { 3180 st->print("@%d (line %d)", sd->bci(), lineno); 3181 } else { 3182 st->print("@%d", sd->bci()); 3183 } 3184 st->cr(); 3185 } 3186 } 3187 3188 // Print relocation information 3189 // Prevent memory leak: allocating without ResourceMark. 3190 ResourceMark rm; 3191 const char* str = reloc_string_for(begin, end); 3192 if (str != NULL) { 3193 if (sd != NULL) st->cr(); 3194 st->move_to(column, 6, 0); 3195 st->print("; {%s}", str); 3196 } 3197 } 3198 3199 #endif 3200 3201 class DirectNativeCallWrapper: public NativeCallWrapper { 3202 private: 3203 NativeCall* _call; 3204 3205 public: 3206 DirectNativeCallWrapper(NativeCall* call) : _call(call) {} 3207 3208 virtual address destination() const { return _call->destination(); } 3209 virtual address instruction_address() const { return _call->instruction_address(); } 3210 virtual address next_instruction_address() const { return _call->next_instruction_address(); } 3211 virtual address return_address() const { return _call->return_address(); } 3212 3213 virtual address get_resolve_call_stub(bool is_optimized) const { 3214 if (is_optimized) { 3215 return SharedRuntime::get_resolve_opt_virtual_call_stub(); 3216 } 3217 return SharedRuntime::get_resolve_virtual_call_stub(); 3218 } 3219 3220 virtual void set_destination_mt_safe(address dest) { 3221 #if INCLUDE_AOT 3222 if (UseAOT) { 3223 CodeBlob* callee = CodeCache::find_blob(dest); 3224 CompiledMethod* cm = callee->as_compiled_method_or_null(); 3225 if (cm != NULL && cm->is_far_code()) { 3226 // Temporary fix, see JDK-8143106 3227 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address()); 3228 csc->set_to_far(methodHandle(cm->method()), dest); 3229 return; 3230 } 3231 } 3232 #endif 3233 _call->set_destination_mt_safe(dest); 3234 } 3235 3236 virtual void set_to_interpreted(const methodHandle& method, CompiledICInfo& info) { 3237 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address()); 3238 #if INCLUDE_AOT 3239 if (info.to_aot()) { 3240 csc->set_to_far(method, info.entry()); 3241 } else 3242 #endif 3243 { 3244 csc->set_to_interpreted(method, info.entry()); 3245 } 3246 } 3247 3248 virtual void verify() const { 3249 // make sure code pattern is actually a call imm32 instruction 3250 _call->verify(); 3251 _call->verify_alignment(); 3252 } 3253 3254 virtual void verify_resolve_call(address dest) const { 3255 CodeBlob* db = CodeCache::find_blob_unsafe(dest); 3256 assert(db != NULL && !db->is_adapter_blob(), "must use stub!"); 3257 } 3258 3259 virtual bool is_call_to_interpreted(address dest) const { 3260 CodeBlob* cb = CodeCache::find_blob(_call->instruction_address()); 3261 return cb->contains(dest); 3262 } 3263 3264 virtual bool is_safe_for_patching() const { return false; } 3265 3266 virtual NativeInstruction* get_load_instruction(virtual_call_Relocation* r) const { 3267 return nativeMovConstReg_at(r->cached_value()); 3268 } 3269 3270 virtual void *get_data(NativeInstruction* instruction) const { 3271 return (void*)((NativeMovConstReg*) instruction)->data(); 3272 } 3273 3274 virtual void set_data(NativeInstruction* instruction, intptr_t data) { 3275 ((NativeMovConstReg*) instruction)->set_data(data); 3276 } 3277 }; 3278 3279 NativeCallWrapper* nmethod::call_wrapper_at(address call) const { 3280 return new DirectNativeCallWrapper((NativeCall*) call); 3281 } 3282 3283 NativeCallWrapper* nmethod::call_wrapper_before(address return_pc) const { 3284 return new DirectNativeCallWrapper(nativeCall_before(return_pc)); 3285 } 3286 3287 address nmethod::call_instruction_address(address pc) const { 3288 if (NativeCall::is_call_before(pc)) { 3289 NativeCall *ncall = nativeCall_before(pc); 3290 return ncall->instruction_address(); 3291 } 3292 return NULL; 3293 } 3294 3295 CompiledStaticCall* nmethod::compiledStaticCall_at(Relocation* call_site) const { 3296 return CompiledDirectStaticCall::at(call_site); 3297 } 3298 3299 CompiledStaticCall* nmethod::compiledStaticCall_at(address call_site) const { 3300 return CompiledDirectStaticCall::at(call_site); 3301 } 3302 3303 CompiledStaticCall* nmethod::compiledStaticCall_before(address return_addr) const { 3304 return CompiledDirectStaticCall::before(return_addr); 3305 } 3306 3307 #if defined(SUPPORT_DATA_STRUCTS) 3308 void nmethod::print_value_on(outputStream* st) const { 3309 st->print("nmethod"); 3310 print_on(st, NULL); 3311 } 3312 #endif 3313 3314 #ifndef PRODUCT 3315 3316 void nmethod::print_calls(outputStream* st) { 3317 RelocIterator iter(this); 3318 while (iter.next()) { 3319 switch (iter.type()) { 3320 case relocInfo::virtual_call_type: 3321 case relocInfo::opt_virtual_call_type: { 3322 CompiledICLocker ml_verify(this); 3323 CompiledIC_at(&iter)->print(); 3324 break; 3325 } 3326 case relocInfo::static_call_type: 3327 st->print_cr("Static call at " INTPTR_FORMAT, p2i(iter.reloc()->addr())); 3328 CompiledDirectStaticCall::at(iter.reloc())->print(); 3329 break; 3330 default: 3331 break; 3332 } 3333 } 3334 } 3335 3336 void nmethod::print_statistics() { 3337 ttyLocker ttyl; 3338 if (xtty != NULL) xtty->head("statistics type='nmethod'"); 3339 native_nmethod_stats.print_native_nmethod_stats(); 3340 #ifdef COMPILER1 3341 c1_java_nmethod_stats.print_nmethod_stats("C1"); 3342 #endif 3343 #ifdef COMPILER2 3344 c2_java_nmethod_stats.print_nmethod_stats("C2"); 3345 #endif 3346 #if INCLUDE_JVMCI 3347 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI"); 3348 #endif 3349 unknown_java_nmethod_stats.print_nmethod_stats("Unknown"); 3350 DebugInformationRecorder::print_statistics(); 3351 #ifndef PRODUCT 3352 pc_nmethod_stats.print_pc_stats(); 3353 #endif 3354 Dependencies::print_statistics(); 3355 if (xtty != NULL) xtty->tail("statistics"); 3356 } 3357 3358 #endif // !PRODUCT 3359 3360 #if INCLUDE_JVMCI 3361 void nmethod::update_speculation(JavaThread* thread) { 3362 jlong speculation = thread->pending_failed_speculation(); 3363 if (speculation != 0) { 3364 guarantee(jvmci_nmethod_data() != NULL, "failed speculation in nmethod without failed speculation list"); 3365 jvmci_nmethod_data()->add_failed_speculation(this, speculation); 3366 thread->set_pending_failed_speculation(0); 3367 } 3368 } 3369 3370 const char* nmethod::jvmci_name() { 3371 if (jvmci_nmethod_data() != NULL) { 3372 return jvmci_nmethod_data()->name(); 3373 } 3374 return NULL; 3375 } 3376 #endif