1 /* 2 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "code/codeCache.hpp" 27 #include "code/compiledIC.hpp" 28 #include "code/dependencies.hpp" 29 #include "code/nativeInst.hpp" 30 #include "code/nmethod.hpp" 31 #include "code/scopeDesc.hpp" 32 #include "compiler/abstractCompiler.hpp" 33 #include "compiler/compileBroker.hpp" 34 #include "compiler/compileLog.hpp" 35 #include "compiler/compilerDirectives.hpp" 36 #include "compiler/directivesParser.hpp" 37 #include "compiler/disassembler.hpp" 38 #include "interpreter/bytecode.hpp" 39 #include "logging/log.hpp" 40 #include "memory/resourceArea.hpp" 41 #include "oops/methodData.hpp" 42 #include "oops/oop.inline.hpp" 43 #include "prims/jvmtiImpl.hpp" 44 #include "runtime/atomic.inline.hpp" 45 #include "runtime/orderAccess.inline.hpp" 46 #include "runtime/os.hpp" 47 #include "runtime/sharedRuntime.hpp" 48 #include "runtime/sweeper.hpp" 49 #include "utilities/resourceHash.hpp" 50 #include "utilities/dtrace.hpp" 51 #include "utilities/events.hpp" 52 #include "utilities/xmlstream.hpp" 53 #include "logging/log.hpp" 54 #ifdef SHARK 55 #include "shark/sharkCompiler.hpp" 56 #endif 57 #if INCLUDE_JVMCI 58 #include "jvmci/jvmciJavaClasses.hpp" 59 #endif 60 61 #ifdef DTRACE_ENABLED 62 63 // Only bother with this argument setup if dtrace is available 64 65 #define DTRACE_METHOD_UNLOAD_PROBE(method) \ 66 { \ 67 Method* m = (method); \ 68 if (m != NULL) { \ 69 Symbol* klass_name = m->klass_name(); \ 70 Symbol* name = m->name(); \ 71 Symbol* signature = m->signature(); \ 72 HOTSPOT_COMPILED_METHOD_UNLOAD( \ 73 (char *) klass_name->bytes(), klass_name->utf8_length(), \ 74 (char *) name->bytes(), name->utf8_length(), \ 75 (char *) signature->bytes(), signature->utf8_length()); \ 76 } \ 77 } 78 79 #else // ndef DTRACE_ENABLED 80 81 #define DTRACE_METHOD_UNLOAD_PROBE(method) 82 83 #endif 84 85 bool nmethod::is_compiled_by_c1() const { 86 if (compiler() == NULL) { 87 return false; 88 } 89 return compiler()->is_c1(); 90 } 91 bool nmethod::is_compiled_by_jvmci() const { 92 if (compiler() == NULL || method() == NULL) return false; // can happen during debug printing 93 if (is_native_method()) return false; 94 return compiler()->is_jvmci(); 95 } 96 bool nmethod::is_compiled_by_c2() const { 97 if (compiler() == NULL) { 98 return false; 99 } 100 return compiler()->is_c2(); 101 } 102 bool nmethod::is_compiled_by_shark() const { 103 if (compiler() == NULL) { 104 return false; 105 } 106 return compiler()->is_shark(); 107 } 108 109 110 111 //--------------------------------------------------------------------------------- 112 // NMethod statistics 113 // They are printed under various flags, including: 114 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation. 115 // (In the latter two cases, they like other stats are printed to the log only.) 116 117 #ifndef PRODUCT 118 // These variables are put into one block to reduce relocations 119 // and make it simpler to print from the debugger. 120 struct java_nmethod_stats_struct { 121 int nmethod_count; 122 int total_size; 123 int relocation_size; 124 int consts_size; 125 int insts_size; 126 int stub_size; 127 int scopes_data_size; 128 int scopes_pcs_size; 129 int dependencies_size; 130 int handler_table_size; 131 int nul_chk_table_size; 132 int oops_size; 133 int metadata_size; 134 135 void note_nmethod(nmethod* nm) { 136 nmethod_count += 1; 137 total_size += nm->size(); 138 relocation_size += nm->relocation_size(); 139 consts_size += nm->consts_size(); 140 insts_size += nm->insts_size(); 141 stub_size += nm->stub_size(); 142 oops_size += nm->oops_size(); 143 metadata_size += nm->metadata_size(); 144 scopes_data_size += nm->scopes_data_size(); 145 scopes_pcs_size += nm->scopes_pcs_size(); 146 dependencies_size += nm->dependencies_size(); 147 handler_table_size += nm->handler_table_size(); 148 nul_chk_table_size += nm->nul_chk_table_size(); 149 } 150 void print_nmethod_stats(const char* name) { 151 if (nmethod_count == 0) return; 152 tty->print_cr("Statistics for %d bytecoded nmethods for %s:", nmethod_count, name); 153 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size); 154 if (nmethod_count != 0) tty->print_cr(" header = " SIZE_FORMAT, nmethod_count * sizeof(nmethod)); 155 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size); 156 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size); 157 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size); 158 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size); 159 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size); 160 if (metadata_size != 0) tty->print_cr(" metadata = %d", metadata_size); 161 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size); 162 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size); 163 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size); 164 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size); 165 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size); 166 } 167 }; 168 169 struct native_nmethod_stats_struct { 170 int native_nmethod_count; 171 int native_total_size; 172 int native_relocation_size; 173 int native_insts_size; 174 int native_oops_size; 175 int native_metadata_size; 176 void note_native_nmethod(nmethod* nm) { 177 native_nmethod_count += 1; 178 native_total_size += nm->size(); 179 native_relocation_size += nm->relocation_size(); 180 native_insts_size += nm->insts_size(); 181 native_oops_size += nm->oops_size(); 182 native_metadata_size += nm->metadata_size(); 183 } 184 void print_native_nmethod_stats() { 185 if (native_nmethod_count == 0) return; 186 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count); 187 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size); 188 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size); 189 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size); 190 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size); 191 if (native_metadata_size != 0) tty->print_cr(" N. metadata = %d", native_metadata_size); 192 } 193 }; 194 195 struct pc_nmethod_stats_struct { 196 int pc_desc_resets; // number of resets (= number of caches) 197 int pc_desc_queries; // queries to nmethod::find_pc_desc 198 int pc_desc_approx; // number of those which have approximate true 199 int pc_desc_repeats; // number of _pc_descs[0] hits 200 int pc_desc_hits; // number of LRU cache hits 201 int pc_desc_tests; // total number of PcDesc examinations 202 int pc_desc_searches; // total number of quasi-binary search steps 203 int pc_desc_adds; // number of LUR cache insertions 204 205 void print_pc_stats() { 206 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query", 207 pc_desc_queries, 208 (double)(pc_desc_tests + pc_desc_searches) 209 / pc_desc_queries); 210 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d", 211 pc_desc_resets, 212 pc_desc_queries, pc_desc_approx, 213 pc_desc_repeats, pc_desc_hits, 214 pc_desc_tests, pc_desc_searches, pc_desc_adds); 215 } 216 }; 217 218 #ifdef COMPILER1 219 static java_nmethod_stats_struct c1_java_nmethod_stats; 220 #endif 221 #ifdef COMPILER2 222 static java_nmethod_stats_struct c2_java_nmethod_stats; 223 #endif 224 #if INCLUDE_JVMCI 225 static java_nmethod_stats_struct jvmci_java_nmethod_stats; 226 #endif 227 #ifdef SHARK 228 static java_nmethod_stats_struct shark_java_nmethod_stats; 229 #endif 230 static java_nmethod_stats_struct unknown_java_nmethod_stats; 231 232 static native_nmethod_stats_struct native_nmethod_stats; 233 static pc_nmethod_stats_struct pc_nmethod_stats; 234 235 static void note_java_nmethod(nmethod* nm) { 236 #ifdef COMPILER1 237 if (nm->is_compiled_by_c1()) { 238 c1_java_nmethod_stats.note_nmethod(nm); 239 } else 240 #endif 241 #ifdef COMPILER2 242 if (nm->is_compiled_by_c2()) { 243 c2_java_nmethod_stats.note_nmethod(nm); 244 } else 245 #endif 246 #if INCLUDE_JVMCI 247 if (nm->is_compiled_by_jvmci()) { 248 jvmci_java_nmethod_stats.note_nmethod(nm); 249 } else 250 #endif 251 #ifdef SHARK 252 if (nm->is_compiled_by_shark()) { 253 shark_java_nmethod_stats.note_nmethod(nm); 254 } else 255 #endif 256 { 257 unknown_java_nmethod_stats.note_nmethod(nm); 258 } 259 } 260 #endif // !PRODUCT 261 262 //--------------------------------------------------------------------------------- 263 264 265 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) { 266 assert(pc != NULL, "Must be non null"); 267 assert(exception.not_null(), "Must be non null"); 268 assert(handler != NULL, "Must be non null"); 269 270 _count = 0; 271 _exception_type = exception->klass(); 272 _next = NULL; 273 274 add_address_and_handler(pc,handler); 275 } 276 277 278 address ExceptionCache::match(Handle exception, address pc) { 279 assert(pc != NULL,"Must be non null"); 280 assert(exception.not_null(),"Must be non null"); 281 if (exception->klass() == exception_type()) { 282 return (test_address(pc)); 283 } 284 285 return NULL; 286 } 287 288 289 bool ExceptionCache::match_exception_with_space(Handle exception) { 290 assert(exception.not_null(),"Must be non null"); 291 if (exception->klass() == exception_type() && count() < cache_size) { 292 return true; 293 } 294 return false; 295 } 296 297 298 address ExceptionCache::test_address(address addr) { 299 int limit = count(); 300 for (int i = 0; i < limit; i++) { 301 if (pc_at(i) == addr) { 302 return handler_at(i); 303 } 304 } 305 return NULL; 306 } 307 308 309 bool ExceptionCache::add_address_and_handler(address addr, address handler) { 310 if (test_address(addr) == handler) return true; 311 312 int index = count(); 313 if (index < cache_size) { 314 set_pc_at(index, addr); 315 set_handler_at(index, handler); 316 increment_count(); 317 return true; 318 } 319 return false; 320 } 321 322 //----------------------------------------------------------------------------- 323 324 325 // Helper used by both find_pc_desc methods. 326 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) { 327 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_tests); 328 if (!approximate) 329 return pc->pc_offset() == pc_offset; 330 else 331 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset(); 332 } 333 334 void PcDescCache::reset_to(PcDesc* initial_pc_desc) { 335 if (initial_pc_desc == NULL) { 336 _pc_descs[0] = NULL; // native method; no PcDescs at all 337 return; 338 } 339 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_resets); 340 // reset the cache by filling it with benign (non-null) values 341 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel"); 342 for (int i = 0; i < cache_size; i++) 343 _pc_descs[i] = initial_pc_desc; 344 } 345 346 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) { 347 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_queries); 348 NOT_PRODUCT(if (approximate) ++pc_nmethod_stats.pc_desc_approx); 349 350 // Note: one might think that caching the most recently 351 // read value separately would be a win, but one would be 352 // wrong. When many threads are updating it, the cache 353 // line it's in would bounce between caches, negating 354 // any benefit. 355 356 // In order to prevent race conditions do not load cache elements 357 // repeatedly, but use a local copy: 358 PcDesc* res; 359 360 // Step one: Check the most recently added value. 361 res = _pc_descs[0]; 362 if (res == NULL) return NULL; // native method; no PcDescs at all 363 if (match_desc(res, pc_offset, approximate)) { 364 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_repeats); 365 return res; 366 } 367 368 // Step two: Check the rest of the LRU cache. 369 for (int i = 1; i < cache_size; ++i) { 370 res = _pc_descs[i]; 371 if (res->pc_offset() < 0) break; // optimization: skip empty cache 372 if (match_desc(res, pc_offset, approximate)) { 373 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_hits); 374 return res; 375 } 376 } 377 378 // Report failure. 379 return NULL; 380 } 381 382 void PcDescCache::add_pc_desc(PcDesc* pc_desc) { 383 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_adds); 384 // Update the LRU cache by shifting pc_desc forward. 385 for (int i = 0; i < cache_size; i++) { 386 PcDesc* next = _pc_descs[i]; 387 _pc_descs[i] = pc_desc; 388 pc_desc = next; 389 } 390 } 391 392 // adjust pcs_size so that it is a multiple of both oopSize and 393 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple 394 // of oopSize, then 2*sizeof(PcDesc) is) 395 static int adjust_pcs_size(int pcs_size) { 396 int nsize = round_to(pcs_size, oopSize); 397 if ((nsize % sizeof(PcDesc)) != 0) { 398 nsize = pcs_size + sizeof(PcDesc); 399 } 400 assert((nsize % oopSize) == 0, "correct alignment"); 401 return nsize; 402 } 403 404 405 int nmethod::total_size() const { 406 return 407 consts_size() + 408 insts_size() + 409 stub_size() + 410 scopes_data_size() + 411 scopes_pcs_size() + 412 handler_table_size() + 413 nul_chk_table_size(); 414 } 415 416 const char* nmethod::compile_kind() const { 417 if (is_osr_method()) return "osr"; 418 if (method() != NULL && is_native_method()) return "c2n"; 419 return NULL; 420 } 421 422 // Fill in default values for various flag fields 423 void nmethod::init_defaults() { 424 _state = in_use; 425 _has_flushed_dependencies = 0; 426 _lock_count = 0; 427 _stack_traversal_mark = 0; 428 _unload_reported = false; // jvmti state 429 430 #ifdef ASSERT 431 _oops_are_stale = false; 432 #endif 433 434 _oops_do_mark_link = NULL; 435 _jmethod_id = NULL; 436 _osr_link = NULL; 437 if (UseG1GC) { 438 _unloading_next = NULL; 439 } else { 440 _scavenge_root_link = NULL; 441 } 442 _scavenge_root_state = 0; 443 _compiler = NULL; 444 #if INCLUDE_RTM_OPT 445 _rtm_state = NoRTM; 446 #endif 447 #if INCLUDE_JVMCI 448 _jvmci_installed_code = NULL; 449 _speculation_log = NULL; 450 #endif 451 } 452 453 nmethod* nmethod::new_native_nmethod(const methodHandle& method, 454 int compile_id, 455 CodeBuffer *code_buffer, 456 int vep_offset, 457 int frame_complete, 458 int frame_size, 459 ByteSize basic_lock_owner_sp_offset, 460 ByteSize basic_lock_sp_offset, 461 OopMapSet* oop_maps) { 462 code_buffer->finalize_oop_references(method); 463 // create nmethod 464 nmethod* nm = NULL; 465 { 466 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 467 int native_nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod)); 468 CodeOffsets offsets; 469 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset); 470 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete); 471 nm = new (native_nmethod_size, CompLevel_none) nmethod(method(), native_nmethod_size, 472 compile_id, &offsets, 473 code_buffer, frame_size, 474 basic_lock_owner_sp_offset, 475 basic_lock_sp_offset, oop_maps); 476 NOT_PRODUCT(if (nm != NULL) native_nmethod_stats.note_native_nmethod(nm)); 477 } 478 // verify nmethod 479 debug_only(if (nm) nm->verify();) // might block 480 481 if (nm != NULL) { 482 nm->log_new_nmethod(); 483 } 484 485 return nm; 486 } 487 488 nmethod* nmethod::new_nmethod(const methodHandle& method, 489 int compile_id, 490 int entry_bci, 491 CodeOffsets* offsets, 492 int orig_pc_offset, 493 DebugInformationRecorder* debug_info, 494 Dependencies* dependencies, 495 CodeBuffer* code_buffer, int frame_size, 496 OopMapSet* oop_maps, 497 ExceptionHandlerTable* handler_table, 498 ImplicitExceptionTable* nul_chk_table, 499 AbstractCompiler* compiler, 500 int comp_level 501 #if INCLUDE_JVMCI 502 , Handle installed_code, 503 Handle speculationLog 504 #endif 505 ) 506 { 507 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); 508 code_buffer->finalize_oop_references(method); 509 // create nmethod 510 nmethod* nm = NULL; 511 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 512 int nmethod_size = 513 CodeBlob::allocation_size(code_buffer, sizeof(nmethod)) 514 + adjust_pcs_size(debug_info->pcs_size()) 515 + round_to(dependencies->size_in_bytes() , oopSize) 516 + round_to(handler_table->size_in_bytes(), oopSize) 517 + round_to(nul_chk_table->size_in_bytes(), oopSize) 518 + round_to(debug_info->data_size() , oopSize); 519 520 nm = new (nmethod_size, comp_level) 521 nmethod(method(), nmethod_size, compile_id, entry_bci, offsets, 522 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size, 523 oop_maps, 524 handler_table, 525 nul_chk_table, 526 compiler, 527 comp_level 528 #if INCLUDE_JVMCI 529 , installed_code, 530 speculationLog 531 #endif 532 ); 533 534 if (nm != NULL) { 535 // To make dependency checking during class loading fast, record 536 // the nmethod dependencies in the classes it is dependent on. 537 // This allows the dependency checking code to simply walk the 538 // class hierarchy above the loaded class, checking only nmethods 539 // which are dependent on those classes. The slow way is to 540 // check every nmethod for dependencies which makes it linear in 541 // the number of methods compiled. For applications with a lot 542 // classes the slow way is too slow. 543 for (Dependencies::DepStream deps(nm); deps.next(); ) { 544 if (deps.type() == Dependencies::call_site_target_value) { 545 // CallSite dependencies are managed on per-CallSite instance basis. 546 oop call_site = deps.argument_oop(0); 547 MethodHandles::add_dependent_nmethod(call_site, nm); 548 } else { 549 Klass* klass = deps.context_type(); 550 if (klass == NULL) { 551 continue; // ignore things like evol_method 552 } 553 // record this nmethod as dependent on this klass 554 InstanceKlass::cast(klass)->add_dependent_nmethod(nm); 555 } 556 } 557 NOT_PRODUCT(if (nm != NULL) note_java_nmethod(nm)); 558 } 559 } 560 // Do verification and logging outside CodeCache_lock. 561 if (nm != NULL) { 562 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet. 563 DEBUG_ONLY(nm->verify();) 564 nm->log_new_nmethod(); 565 } 566 return nm; 567 } 568 569 // For native wrappers 570 nmethod::nmethod( 571 Method* method, 572 int nmethod_size, 573 int compile_id, 574 CodeOffsets* offsets, 575 CodeBuffer* code_buffer, 576 int frame_size, 577 ByteSize basic_lock_owner_sp_offset, 578 ByteSize basic_lock_sp_offset, 579 OopMapSet* oop_maps ) 580 : CompiledMethod(method, "native nmethod", nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false), 581 _native_receiver_sp_offset(basic_lock_owner_sp_offset), 582 _native_basic_lock_sp_offset(basic_lock_sp_offset) 583 { 584 { 585 int scopes_data_offset = 0; 586 int deoptimize_offset = 0; 587 int deoptimize_mh_offset = 0; 588 589 debug_only(NoSafepointVerifier nsv;) 590 assert_locked_or_safepoint(CodeCache_lock); 591 592 init_defaults(); 593 _entry_bci = InvocationEntryBci; 594 // We have no exception handler or deopt handler make the 595 // values something that will never match a pc like the nmethod vtable entry 596 _exception_offset = 0; 597 _orig_pc_offset = 0; 598 599 _consts_offset = data_offset(); 600 _stub_offset = data_offset(); 601 _oops_offset = data_offset(); 602 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize); 603 scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize); 604 _scopes_pcs_offset = scopes_data_offset; 605 _dependencies_offset = _scopes_pcs_offset; 606 _handler_table_offset = _dependencies_offset; 607 _nul_chk_table_offset = _handler_table_offset; 608 _nmethod_end_offset = _nul_chk_table_offset; 609 _compile_id = compile_id; 610 _comp_level = CompLevel_none; 611 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 612 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 613 _osr_entry_point = NULL; 614 _exception_cache = NULL; 615 _pc_desc_container.reset_to(NULL); 616 _hotness_counter = NMethodSweeper::hotness_counter_reset_val(); 617 618 _scopes_data_begin = (address) this + scopes_data_offset; 619 _deopt_handler_begin = (address) this + deoptimize_offset; 620 _deopt_mh_handler_begin = (address) this + deoptimize_mh_offset; 621 622 code_buffer->copy_code_and_locs_to(this); 623 code_buffer->copy_values_to(this); 624 if (ScavengeRootsInCode) { 625 if (detect_scavenge_root_oops()) { 626 CodeCache::add_scavenge_root_nmethod(this); 627 } 628 Universe::heap()->register_nmethod(this); 629 } 630 debug_only(verify_scavenge_root_oops()); 631 CodeCache::commit(this); 632 } 633 634 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) { 635 ttyLocker ttyl; // keep the following output all in one block 636 // This output goes directly to the tty, not the compiler log. 637 // To enable tools to match it up with the compilation activity, 638 // be sure to tag this tty output with the compile ID. 639 if (xtty != NULL) { 640 xtty->begin_head("print_native_nmethod"); 641 xtty->method(_method); 642 xtty->stamp(); 643 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this); 644 } 645 // print the header part first 646 print(); 647 // then print the requested information 648 if (PrintNativeNMethods) { 649 print_code(); 650 if (oop_maps != NULL) { 651 oop_maps->print(); 652 } 653 } 654 if (PrintRelocations) { 655 print_relocations(); 656 } 657 if (xtty != NULL) { 658 xtty->tail("print_native_nmethod"); 659 } 660 } 661 } 662 663 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () { 664 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level)); 665 } 666 667 nmethod::nmethod( 668 Method* method, 669 int nmethod_size, 670 int compile_id, 671 int entry_bci, 672 CodeOffsets* offsets, 673 int orig_pc_offset, 674 DebugInformationRecorder* debug_info, 675 Dependencies* dependencies, 676 CodeBuffer *code_buffer, 677 int frame_size, 678 OopMapSet* oop_maps, 679 ExceptionHandlerTable* handler_table, 680 ImplicitExceptionTable* nul_chk_table, 681 AbstractCompiler* compiler, 682 int comp_level 683 #if INCLUDE_JVMCI 684 , Handle installed_code, 685 Handle speculation_log 686 #endif 687 ) 688 : CompiledMethod(method, "nmethod", nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false), 689 _native_receiver_sp_offset(in_ByteSize(-1)), 690 _native_basic_lock_sp_offset(in_ByteSize(-1)) 691 { 692 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); 693 { 694 debug_only(NoSafepointVerifier nsv;) 695 assert_locked_or_safepoint(CodeCache_lock); 696 697 _deopt_handler_begin = (address) this; 698 _deopt_mh_handler_begin = (address) this; 699 700 init_defaults(); 701 _entry_bci = entry_bci; 702 _compile_id = compile_id; 703 _comp_level = comp_level; 704 _compiler = compiler; 705 _orig_pc_offset = orig_pc_offset; 706 _hotness_counter = NMethodSweeper::hotness_counter_reset_val(); 707 708 // Section offsets 709 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts()); 710 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs()); 711 712 #if INCLUDE_JVMCI 713 _jvmci_installed_code = installed_code(); 714 _speculation_log = (instanceOop)speculation_log(); 715 716 if (compiler->is_jvmci()) { 717 // JVMCI might not produce any stub sections 718 if (offsets->value(CodeOffsets::Exceptions) != -1) { 719 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions); 720 } else { 721 _exception_offset = -1; 722 } 723 if (offsets->value(CodeOffsets::Deopt) != -1) { 724 _deopt_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::Deopt); 725 } else { 726 _deopt_handler_begin = NULL; 727 } 728 if (offsets->value(CodeOffsets::DeoptMH) != -1) { 729 _deopt_mh_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::DeoptMH); 730 } else { 731 _deopt_mh_handler_begin = NULL; 732 } 733 } else { 734 #endif 735 // Exception handler and deopt handler are in the stub section 736 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set"); 737 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set"); 738 739 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions); 740 _deopt_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::Deopt); 741 if (offsets->value(CodeOffsets::DeoptMH) != -1) { 742 _deopt_mh_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::DeoptMH); 743 } else { 744 _deopt_mh_handler_begin = NULL; 745 #if INCLUDE_JVMCI 746 } 747 #endif 748 } 749 if (offsets->value(CodeOffsets::UnwindHandler) != -1) { 750 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler); 751 } else { 752 _unwind_handler_offset = -1; 753 } 754 755 _oops_offset = data_offset(); 756 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize); 757 int scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize); 758 759 _scopes_pcs_offset = scopes_data_offset + round_to(debug_info->data_size (), oopSize); 760 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size()); 761 _handler_table_offset = _dependencies_offset + round_to(dependencies->size_in_bytes (), oopSize); 762 _nul_chk_table_offset = _handler_table_offset + round_to(handler_table->size_in_bytes(), oopSize); 763 _nmethod_end_offset = _nul_chk_table_offset + round_to(nul_chk_table->size_in_bytes(), oopSize); 764 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 765 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 766 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry); 767 _exception_cache = NULL; 768 769 _scopes_data_begin = (address) this + scopes_data_offset; 770 771 _pc_desc_container.reset_to(scopes_pcs_begin()); 772 773 code_buffer->copy_code_and_locs_to(this); 774 // Copy contents of ScopeDescRecorder to nmethod 775 code_buffer->copy_values_to(this); 776 debug_info->copy_to(this); 777 dependencies->copy_to(this); 778 if (ScavengeRootsInCode) { 779 if (detect_scavenge_root_oops()) { 780 CodeCache::add_scavenge_root_nmethod(this); 781 } 782 Universe::heap()->register_nmethod(this); 783 } 784 debug_only(verify_scavenge_root_oops()); 785 786 CodeCache::commit(this); 787 788 // Copy contents of ExceptionHandlerTable to nmethod 789 handler_table->copy_to(this); 790 nul_chk_table->copy_to(this); 791 792 // we use the information of entry points to find out if a method is 793 // static or non static 794 assert(compiler->is_c2() || compiler->is_jvmci() || 795 _method->is_static() == (entry_point() == _verified_entry_point), 796 " entry points must be same for static methods and vice versa"); 797 } 798 } 799 800 // Print a short set of xml attributes to identify this nmethod. The 801 // output should be embedded in some other element. 802 void nmethod::log_identity(xmlStream* log) const { 803 log->print(" compile_id='%d'", compile_id()); 804 const char* nm_kind = compile_kind(); 805 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind); 806 if (compiler() != NULL) { 807 log->print(" compiler='%s'", compiler()->name()); 808 } 809 if (TieredCompilation) { 810 log->print(" level='%d'", comp_level()); 811 } 812 } 813 814 815 #define LOG_OFFSET(log, name) \ 816 if (p2i(name##_end()) - p2i(name##_begin())) \ 817 log->print(" " XSTR(name) "_offset='" INTX_FORMAT "'" , \ 818 p2i(name##_begin()) - p2i(this)) 819 820 821 void nmethod::log_new_nmethod() const { 822 if (LogCompilation && xtty != NULL) { 823 ttyLocker ttyl; 824 HandleMark hm; 825 xtty->begin_elem("nmethod"); 826 log_identity(xtty); 827 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size()); 828 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this)); 829 830 LOG_OFFSET(xtty, relocation); 831 LOG_OFFSET(xtty, consts); 832 LOG_OFFSET(xtty, insts); 833 LOG_OFFSET(xtty, stub); 834 LOG_OFFSET(xtty, scopes_data); 835 LOG_OFFSET(xtty, scopes_pcs); 836 LOG_OFFSET(xtty, dependencies); 837 LOG_OFFSET(xtty, handler_table); 838 LOG_OFFSET(xtty, nul_chk_table); 839 LOG_OFFSET(xtty, oops); 840 LOG_OFFSET(xtty, metadata); 841 842 xtty->method(method()); 843 xtty->stamp(); 844 xtty->end_elem(); 845 } 846 } 847 848 #undef LOG_OFFSET 849 850 851 // Print out more verbose output usually for a newly created nmethod. 852 void nmethod::print_on(outputStream* st, const char* msg) const { 853 if (st != NULL) { 854 ttyLocker ttyl; 855 if (WizardMode) { 856 CompileTask::print(st, this, msg, /*short_form:*/ true); 857 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this)); 858 } else { 859 CompileTask::print(st, this, msg, /*short_form:*/ false); 860 } 861 } 862 } 863 864 void nmethod::maybe_print_nmethod(DirectiveSet* directive) { 865 bool printnmethods = directive->PrintAssemblyOption || directive->PrintNMethodsOption; 866 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) { 867 print_nmethod(printnmethods); 868 } 869 } 870 871 void nmethod::print_nmethod(bool printmethod) { 872 ttyLocker ttyl; // keep the following output all in one block 873 if (xtty != NULL) { 874 xtty->begin_head("print_nmethod"); 875 xtty->stamp(); 876 xtty->end_head(); 877 } 878 // print the header part first 879 print(); 880 // then print the requested information 881 if (printmethod) { 882 print_code(); 883 print_pcs(); 884 if (oop_maps()) { 885 oop_maps()->print(); 886 } 887 } 888 if (printmethod || PrintDebugInfo || CompilerOracle::has_option_string(_method, "PrintDebugInfo")) { 889 print_scopes(); 890 } 891 if (printmethod || PrintRelocations || CompilerOracle::has_option_string(_method, "PrintRelocations")) { 892 print_relocations(); 893 } 894 if (printmethod || PrintDependencies || CompilerOracle::has_option_string(_method, "PrintDependencies")) { 895 print_dependencies(); 896 } 897 if (printmethod || PrintExceptionHandlers) { 898 print_handler_table(); 899 print_nul_chk_table(); 900 } 901 if (printmethod) { 902 print_recorded_oops(); 903 print_recorded_metadata(); 904 } 905 if (xtty != NULL) { 906 xtty->tail("print_nmethod"); 907 } 908 } 909 910 911 // Promote one word from an assembly-time handle to a live embedded oop. 912 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) { 913 if (handle == NULL || 914 // As a special case, IC oops are initialized to 1 or -1. 915 handle == (jobject) Universe::non_oop_word()) { 916 (*dest) = (oop) handle; 917 } else { 918 (*dest) = JNIHandles::resolve_non_null(handle); 919 } 920 } 921 922 923 // Have to have the same name because it's called by a template 924 void nmethod::copy_values(GrowableArray<jobject>* array) { 925 int length = array->length(); 926 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough"); 927 oop* dest = oops_begin(); 928 for (int index = 0 ; index < length; index++) { 929 initialize_immediate_oop(&dest[index], array->at(index)); 930 } 931 932 // Now we can fix up all the oops in the code. We need to do this 933 // in the code because the assembler uses jobjects as placeholders. 934 // The code and relocations have already been initialized by the 935 // CodeBlob constructor, so it is valid even at this early point to 936 // iterate over relocations and patch the code. 937 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true); 938 } 939 940 void nmethod::copy_values(GrowableArray<Metadata*>* array) { 941 int length = array->length(); 942 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough"); 943 Metadata** dest = metadata_begin(); 944 for (int index = 0 ; index < length; index++) { 945 dest[index] = array->at(index); 946 } 947 } 948 949 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) { 950 // re-patch all oop-bearing instructions, just in case some oops moved 951 RelocIterator iter(this, begin, end); 952 while (iter.next()) { 953 if (iter.type() == relocInfo::oop_type) { 954 oop_Relocation* reloc = iter.oop_reloc(); 955 if (initialize_immediates && reloc->oop_is_immediate()) { 956 oop* dest = reloc->oop_addr(); 957 initialize_immediate_oop(dest, (jobject) *dest); 958 } 959 // Refresh the oop-related bits of this instruction. 960 reloc->fix_oop_relocation(); 961 } else if (iter.type() == relocInfo::metadata_type) { 962 metadata_Relocation* reloc = iter.metadata_reloc(); 963 reloc->fix_metadata_relocation(); 964 } 965 } 966 } 967 968 969 void nmethod::verify_clean_inline_caches() { 970 assert_locked_or_safepoint(CompiledIC_lock); 971 972 // If the method is not entrant or zombie then a JMP is plastered over the 973 // first few bytes. If an oop in the old code was there, that oop 974 // should not get GC'd. Skip the first few bytes of oops on 975 // not-entrant methods. 976 address low_boundary = verified_entry_point(); 977 if (!is_in_use()) { 978 low_boundary += NativeJump::instruction_size; 979 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 980 // This means that the low_boundary is going to be a little too high. 981 // This shouldn't matter, since oops of non-entrant methods are never used. 982 // In fact, why are we bothering to look at oops in a non-entrant method?? 983 } 984 985 ResourceMark rm; 986 RelocIterator iter(this, low_boundary); 987 while(iter.next()) { 988 switch(iter.type()) { 989 case relocInfo::virtual_call_type: 990 case relocInfo::opt_virtual_call_type: { 991 CompiledIC *ic = CompiledIC_at(&iter); 992 // Ok, to lookup references to zombies here 993 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination()); 994 nmethod* nm = cb->as_nmethod_or_null(); 995 if( nm != NULL ) { 996 // Verify that inline caches pointing to both zombie and not_entrant methods are clean 997 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 998 assert(ic->is_clean(), "IC should be clean"); 999 } 1000 } 1001 break; 1002 } 1003 case relocInfo::static_call_type: { 1004 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc()); 1005 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination()); 1006 nmethod* nm = cb->as_nmethod_or_null(); 1007 if( nm != NULL ) { 1008 // Verify that inline caches pointing to both zombie and not_entrant methods are clean 1009 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 1010 assert(csc->is_clean(), "IC should be clean"); 1011 } 1012 } 1013 break; 1014 } 1015 } 1016 } 1017 } 1018 1019 // This is a private interface with the sweeper. 1020 void nmethod::mark_as_seen_on_stack() { 1021 assert(is_alive(), "Must be an alive method"); 1022 // Set the traversal mark to ensure that the sweeper does 2 1023 // cleaning passes before moving to zombie. 1024 set_stack_traversal_mark(NMethodSweeper::traversal_count()); 1025 } 1026 1027 // Tell if a non-entrant method can be converted to a zombie (i.e., 1028 // there are no activations on the stack, not in use by the VM, 1029 // and not in use by the ServiceThread) 1030 bool nmethod::can_convert_to_zombie() { 1031 assert(is_not_entrant(), "must be a non-entrant method"); 1032 1033 // Since the nmethod sweeper only does partial sweep the sweeper's traversal 1034 // count can be greater than the stack traversal count before it hits the 1035 // nmethod for the second time. 1036 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count() && 1037 !is_locked_by_vm(); 1038 } 1039 1040 void nmethod::inc_decompile_count() { 1041 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return; 1042 // Could be gated by ProfileTraps, but do not bother... 1043 Method* m = method(); 1044 if (m == NULL) return; 1045 MethodData* mdo = m->method_data(); 1046 if (mdo == NULL) return; 1047 // There is a benign race here. See comments in methodData.hpp. 1048 mdo->inc_decompile_count(); 1049 } 1050 1051 void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) { 1052 1053 post_compiled_method_unload(); 1054 1055 // Since this nmethod is being unloaded, make sure that dependencies 1056 // recorded in instanceKlasses get flushed and pass non-NULL closure to 1057 // indicate that this work is being done during a GC. 1058 assert(Universe::heap()->is_gc_active(), "should only be called during gc"); 1059 assert(is_alive != NULL, "Should be non-NULL"); 1060 // A non-NULL is_alive closure indicates that this is being called during GC. 1061 flush_dependencies(is_alive); 1062 1063 // Break cycle between nmethod & method 1064 if (log_is_enabled(Trace, class, unload)) { 1065 outputStream* log = Log(class, unload)::trace_stream(); 1066 log->print_cr("making nmethod " INTPTR_FORMAT 1067 " unloadable, Method*(" INTPTR_FORMAT 1068 "), cause(" INTPTR_FORMAT ")", 1069 p2i(this), p2i(_method), p2i(cause)); 1070 if (!Universe::heap()->is_gc_active()) 1071 cause->klass()->print_on(log); 1072 } 1073 // Unlink the osr method, so we do not look this up again 1074 if (is_osr_method()) { 1075 // Invalidate the osr nmethod only once 1076 if (is_in_use()) { 1077 invalidate_osr_method(); 1078 } 1079 #ifdef ASSERT 1080 if (method() != NULL) { 1081 // Make sure osr nmethod is invalidated, i.e. not on the list 1082 bool found = method()->method_holder()->remove_osr_nmethod(this); 1083 assert(!found, "osr nmethod should have been invalidated"); 1084 } 1085 #endif 1086 } 1087 1088 // If _method is already NULL the Method* is about to be unloaded, 1089 // so we don't have to break the cycle. Note that it is possible to 1090 // have the Method* live here, in case we unload the nmethod because 1091 // it is pointing to some oop (other than the Method*) being unloaded. 1092 if (_method != NULL) { 1093 // OSR methods point to the Method*, but the Method* does not 1094 // point back! 1095 if (_method->code() == this) { 1096 _method->clear_code(); // Break a cycle 1097 } 1098 _method = NULL; // Clear the method of this dead nmethod 1099 } 1100 1101 // Make the class unloaded - i.e., change state and notify sweeper 1102 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); 1103 if (is_in_use()) { 1104 // Transitioning directly from live to unloaded -- so 1105 // we need to force a cache clean-up; remember this 1106 // for later on. 1107 CodeCache::set_needs_cache_clean(true); 1108 } 1109 1110 // Unregister must be done before the state change 1111 Universe::heap()->unregister_nmethod(this); 1112 1113 _state = unloaded; 1114 1115 // Log the unloading. 1116 log_state_change(); 1117 1118 #if INCLUDE_JVMCI 1119 // The method can only be unloaded after the pointer to the installed code 1120 // Java wrapper is no longer alive. Here we need to clear out this weak 1121 // reference to the dead object. Nulling out the reference has to happen 1122 // after the method is unregistered since the original value may be still 1123 // tracked by the rset. 1124 maybe_invalidate_installed_code(); 1125 // Clear these out after the nmethod has been unregistered and any 1126 // updates to the InstalledCode instance have been performed. 1127 _jvmci_installed_code = NULL; 1128 _speculation_log = NULL; 1129 #endif 1130 1131 // The Method* is gone at this point 1132 assert(_method == NULL, "Tautology"); 1133 1134 set_osr_link(NULL); 1135 NMethodSweeper::report_state_change(this); 1136 } 1137 1138 void nmethod::invalidate_osr_method() { 1139 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); 1140 // Remove from list of active nmethods 1141 if (method() != NULL) { 1142 method()->method_holder()->remove_osr_nmethod(this); 1143 } 1144 } 1145 1146 void nmethod::log_state_change() const { 1147 if (LogCompilation) { 1148 if (xtty != NULL) { 1149 ttyLocker ttyl; // keep the following output all in one block 1150 if (_state == unloaded) { 1151 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'", 1152 os::current_thread_id()); 1153 } else { 1154 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s", 1155 os::current_thread_id(), 1156 (_state == zombie ? " zombie='1'" : "")); 1157 } 1158 log_identity(xtty); 1159 xtty->stamp(); 1160 xtty->end_elem(); 1161 } 1162 } 1163 if (PrintCompilation && _state != unloaded) { 1164 print_on(tty, _state == zombie ? "made zombie" : "made not entrant"); 1165 } 1166 } 1167 1168 /** 1169 * Common functionality for both make_not_entrant and make_zombie 1170 */ 1171 bool nmethod::make_not_entrant_or_zombie(unsigned int state) { 1172 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant"); 1173 assert(!is_zombie(), "should not already be a zombie"); 1174 1175 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below. 1176 nmethodLocker nml(this); 1177 methodHandle the_method(method()); 1178 NoSafepointVerifier nsv; 1179 1180 // during patching, depending on the nmethod state we must notify the GC that 1181 // code has been unloaded, unregistering it. We cannot do this right while 1182 // holding the Patching_lock because we need to use the CodeCache_lock. This 1183 // would be prone to deadlocks. 1184 // This flag is used to remember whether we need to later lock and unregister. 1185 bool nmethod_needs_unregister = false; 1186 1187 { 1188 // invalidate osr nmethod before acquiring the patching lock since 1189 // they both acquire leaf locks and we don't want a deadlock. 1190 // This logic is equivalent to the logic below for patching the 1191 // verified entry point of regular methods. We check that the 1192 // nmethod is in use to ensure that it is invalidated only once. 1193 if (is_osr_method() && is_in_use()) { 1194 // this effectively makes the osr nmethod not entrant 1195 invalidate_osr_method(); 1196 } 1197 1198 // Enter critical section. Does not block for safepoint. 1199 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 1200 1201 if (_state == state) { 1202 // another thread already performed this transition so nothing 1203 // to do, but return false to indicate this. 1204 return false; 1205 } 1206 1207 // The caller can be calling the method statically or through an inline 1208 // cache call. 1209 if (!is_osr_method() && !is_not_entrant()) { 1210 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(), 1211 SharedRuntime::get_handle_wrong_method_stub()); 1212 } 1213 1214 if (is_in_use() && update_recompile_counts()) { 1215 // It's a true state change, so mark the method as decompiled. 1216 // Do it only for transition from alive. 1217 inc_decompile_count(); 1218 } 1219 1220 // If the state is becoming a zombie, signal to unregister the nmethod with 1221 // the heap. 1222 // This nmethod may have already been unloaded during a full GC. 1223 if ((state == zombie) && !is_unloaded()) { 1224 nmethod_needs_unregister = true; 1225 } 1226 1227 // Must happen before state change. Otherwise we have a race condition in 1228 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately 1229 // transition its state from 'not_entrant' to 'zombie' without having to wait 1230 // for stack scanning. 1231 if (state == not_entrant) { 1232 mark_as_seen_on_stack(); 1233 OrderAccess::storestore(); 1234 } 1235 1236 // Change state 1237 _state = state; 1238 1239 // Log the transition once 1240 log_state_change(); 1241 1242 // Invalidate while holding the patching lock 1243 JVMCI_ONLY(maybe_invalidate_installed_code()); 1244 1245 // Remove nmethod from method. 1246 // We need to check if both the _code and _from_compiled_code_entry_point 1247 // refer to this nmethod because there is a race in setting these two fields 1248 // in Method* as seen in bugid 4947125. 1249 // If the vep() points to the zombie nmethod, the memory for the nmethod 1250 // could be flushed and the compiler and vtable stubs could still call 1251 // through it. 1252 if (method() != NULL && (method()->code() == this || 1253 method()->from_compiled_entry() == verified_entry_point())) { 1254 HandleMark hm; 1255 method()->clear_code(); 1256 } 1257 } // leave critical region under Patching_lock 1258 1259 #ifdef ASSERT 1260 if (is_osr_method() && method() != NULL) { 1261 // Make sure osr nmethod is invalidated, i.e. not on the list 1262 bool found = method()->method_holder()->remove_osr_nmethod(this); 1263 assert(!found, "osr nmethod should have been invalidated"); 1264 } 1265 #endif 1266 1267 // When the nmethod becomes zombie it is no longer alive so the 1268 // dependencies must be flushed. nmethods in the not_entrant 1269 // state will be flushed later when the transition to zombie 1270 // happens or they get unloaded. 1271 if (state == zombie) { 1272 { 1273 // Flushing dependencies must be done before any possible 1274 // safepoint can sneak in, otherwise the oops used by the 1275 // dependency logic could have become stale. 1276 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1277 if (nmethod_needs_unregister) { 1278 Universe::heap()->unregister_nmethod(this); 1279 #ifdef JVMCI 1280 _jvmci_installed_code = NULL; 1281 _speculation_log = NULL; 1282 #endif 1283 } 1284 flush_dependencies(NULL); 1285 } 1286 1287 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload 1288 // event and it hasn't already been reported for this nmethod then 1289 // report it now. The event may have been reported earlier if the GC 1290 // marked it for unloading). JvmtiDeferredEventQueue support means 1291 // we no longer go to a safepoint here. 1292 post_compiled_method_unload(); 1293 1294 #ifdef ASSERT 1295 // It's no longer safe to access the oops section since zombie 1296 // nmethods aren't scanned for GC. 1297 _oops_are_stale = true; 1298 #endif 1299 // the Method may be reclaimed by class unloading now that the 1300 // nmethod is in zombie state 1301 set_method(NULL); 1302 } else { 1303 assert(state == not_entrant, "other cases may need to be handled differently"); 1304 } 1305 1306 if (TraceCreateZombies) { 1307 ResourceMark m; 1308 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"); 1309 } 1310 1311 NMethodSweeper::report_state_change(this); 1312 return true; 1313 } 1314 1315 void nmethod::flush() { 1316 // Note that there are no valid oops in the nmethod anymore. 1317 assert(!is_osr_method() || is_unloaded() || is_zombie(), 1318 "osr nmethod must be unloaded or zombie before flushing"); 1319 assert(is_zombie() || is_osr_method(), "must be a zombie method"); 1320 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed"); 1321 assert_locked_or_safepoint(CodeCache_lock); 1322 1323 // completely deallocate this method 1324 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, p2i(this)); 1325 if (PrintMethodFlushing) { 1326 tty->print_cr("*flushing %s nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT 1327 "/Free CodeCache:" SIZE_FORMAT "Kb", 1328 is_osr_method() ? "osr" : "",_compile_id, p2i(this), CodeCache::blob_count(), 1329 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024); 1330 } 1331 1332 // We need to deallocate any ExceptionCache data. 1333 // Note that we do not need to grab the nmethod lock for this, it 1334 // better be thread safe if we're disposing of it! 1335 ExceptionCache* ec = exception_cache(); 1336 set_exception_cache(NULL); 1337 while(ec != NULL) { 1338 ExceptionCache* next = ec->next(); 1339 delete ec; 1340 ec = next; 1341 } 1342 1343 if (on_scavenge_root_list()) { 1344 CodeCache::drop_scavenge_root_nmethod(this); 1345 } 1346 1347 #ifdef SHARK 1348 ((SharkCompiler *) compiler())->free_compiled_method(insts_begin()); 1349 #endif // SHARK 1350 1351 CodeBlob::flush(); 1352 CodeCache::free(this); 1353 } 1354 1355 // 1356 // Notify all classes this nmethod is dependent on that it is no 1357 // longer dependent. This should only be called in two situations. 1358 // First, when a nmethod transitions to a zombie all dependents need 1359 // to be clear. Since zombification happens at a safepoint there's no 1360 // synchronization issues. The second place is a little more tricky. 1361 // During phase 1 of mark sweep class unloading may happen and as a 1362 // result some nmethods may get unloaded. In this case the flushing 1363 // of dependencies must happen during phase 1 since after GC any 1364 // dependencies in the unloaded nmethod won't be updated, so 1365 // traversing the dependency information in unsafe. In that case this 1366 // function is called with a non-NULL argument and this function only 1367 // notifies instanceKlasses that are reachable 1368 1369 void nmethod::flush_dependencies(BoolObjectClosure* is_alive) { 1370 assert_locked_or_safepoint(CodeCache_lock); 1371 assert(Universe::heap()->is_gc_active() == (is_alive != NULL), 1372 "is_alive is non-NULL if and only if we are called during GC"); 1373 if (!has_flushed_dependencies()) { 1374 set_has_flushed_dependencies(); 1375 for (Dependencies::DepStream deps(this); deps.next(); ) { 1376 if (deps.type() == Dependencies::call_site_target_value) { 1377 // CallSite dependencies are managed on per-CallSite instance basis. 1378 oop call_site = deps.argument_oop(0); 1379 MethodHandles::remove_dependent_nmethod(call_site, this); 1380 } else { 1381 Klass* klass = deps.context_type(); 1382 if (klass == NULL) { 1383 continue; // ignore things like evol_method 1384 } 1385 // During GC the is_alive closure is non-NULL, and is used to 1386 // determine liveness of dependees that need to be updated. 1387 if (is_alive == NULL || klass->is_loader_alive(is_alive)) { 1388 // The GC defers deletion of this entry, since there might be multiple threads 1389 // iterating over the _dependencies graph. Other call paths are single-threaded 1390 // and may delete it immediately. 1391 bool delete_immediately = is_alive == NULL; 1392 InstanceKlass::cast(klass)->remove_dependent_nmethod(this, delete_immediately); 1393 } 1394 } 1395 } 1396 } 1397 } 1398 1399 1400 // If this oop is not live, the nmethod can be unloaded. 1401 bool nmethod::can_unload(BoolObjectClosure* is_alive, oop* root, bool unloading_occurred) { 1402 assert(root != NULL, "just checking"); 1403 oop obj = *root; 1404 if (obj == NULL || is_alive->do_object_b(obj)) { 1405 return false; 1406 } 1407 1408 // If ScavengeRootsInCode is true, an nmethod might be unloaded 1409 // simply because one of its constant oops has gone dead. 1410 // No actual classes need to be unloaded in order for this to occur. 1411 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading"); 1412 make_unloaded(is_alive, obj); 1413 return true; 1414 } 1415 1416 // ------------------------------------------------------------------ 1417 // post_compiled_method_load_event 1418 // new method for install_code() path 1419 // Transfer information from compilation to jvmti 1420 void nmethod::post_compiled_method_load_event() { 1421 1422 Method* moop = method(); 1423 HOTSPOT_COMPILED_METHOD_LOAD( 1424 (char *) moop->klass_name()->bytes(), 1425 moop->klass_name()->utf8_length(), 1426 (char *) moop->name()->bytes(), 1427 moop->name()->utf8_length(), 1428 (char *) moop->signature()->bytes(), 1429 moop->signature()->utf8_length(), 1430 insts_begin(), insts_size()); 1431 1432 if (JvmtiExport::should_post_compiled_method_load() || 1433 JvmtiExport::should_post_compiled_method_unload()) { 1434 get_and_cache_jmethod_id(); 1435 } 1436 1437 if (JvmtiExport::should_post_compiled_method_load()) { 1438 // Let the Service thread (which is a real Java thread) post the event 1439 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); 1440 JvmtiDeferredEventQueue::enqueue( 1441 JvmtiDeferredEvent::compiled_method_load_event(this)); 1442 } 1443 } 1444 1445 jmethodID nmethod::get_and_cache_jmethod_id() { 1446 if (_jmethod_id == NULL) { 1447 // Cache the jmethod_id since it can no longer be looked up once the 1448 // method itself has been marked for unloading. 1449 _jmethod_id = method()->jmethod_id(); 1450 } 1451 return _jmethod_id; 1452 } 1453 1454 void nmethod::post_compiled_method_unload() { 1455 if (unload_reported()) { 1456 // During unloading we transition to unloaded and then to zombie 1457 // and the unloading is reported during the first transition. 1458 return; 1459 } 1460 1461 assert(_method != NULL && !is_unloaded(), "just checking"); 1462 DTRACE_METHOD_UNLOAD_PROBE(method()); 1463 1464 // If a JVMTI agent has enabled the CompiledMethodUnload event then 1465 // post the event. Sometime later this nmethod will be made a zombie 1466 // by the sweeper but the Method* will not be valid at that point. 1467 // If the _jmethod_id is null then no load event was ever requested 1468 // so don't bother posting the unload. The main reason for this is 1469 // that the jmethodID is a weak reference to the Method* so if 1470 // it's being unloaded there's no way to look it up since the weak 1471 // ref will have been cleared. 1472 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) { 1473 assert(!unload_reported(), "already unloaded"); 1474 JvmtiDeferredEvent event = 1475 JvmtiDeferredEvent::compiled_method_unload_event(this, 1476 _jmethod_id, insts_begin()); 1477 if (SafepointSynchronize::is_at_safepoint()) { 1478 // Don't want to take the queueing lock. Add it as pending and 1479 // it will get enqueued later. 1480 JvmtiDeferredEventQueue::add_pending_event(event); 1481 } else { 1482 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); 1483 JvmtiDeferredEventQueue::enqueue(event); 1484 } 1485 } 1486 1487 // The JVMTI CompiledMethodUnload event can be enabled or disabled at 1488 // any time. As the nmethod is being unloaded now we mark it has 1489 // having the unload event reported - this will ensure that we don't 1490 // attempt to report the event in the unlikely scenario where the 1491 // event is enabled at the time the nmethod is made a zombie. 1492 set_unload_reported(); 1493 } 1494 1495 bool nmethod::unload_if_dead_at(RelocIterator* iter_at_oop, BoolObjectClosure *is_alive, bool unloading_occurred) { 1496 assert(iter_at_oop->type() == relocInfo::oop_type, "Wrong relocation type"); 1497 1498 oop_Relocation* r = iter_at_oop->oop_reloc(); 1499 // Traverse those oops directly embedded in the code. 1500 // Other oops (oop_index>0) are seen as part of scopes_oops. 1501 assert(1 == (r->oop_is_immediate()) + 1502 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 1503 "oop must be found in exactly one place"); 1504 if (r->oop_is_immediate() && r->oop_value() != NULL) { 1505 // Unload this nmethod if the oop is dead. 1506 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) { 1507 return true;; 1508 } 1509 } 1510 1511 return false; 1512 } 1513 1514 bool nmethod::do_unloading_scopes(BoolObjectClosure* is_alive, bool unloading_occurred) { 1515 // Scopes 1516 for (oop* p = oops_begin(); p < oops_end(); p++) { 1517 if (*p == Universe::non_oop_word()) continue; // skip non-oops 1518 if (can_unload(is_alive, p, unloading_occurred)) { 1519 return true; 1520 } 1521 } 1522 return false; 1523 } 1524 1525 bool nmethod::do_unloading_oops(address low_boundary, BoolObjectClosure* is_alive, bool unloading_occurred) { 1526 // Compiled code 1527 { 1528 RelocIterator iter(this, low_boundary); 1529 while (iter.next()) { 1530 if (iter.type() == relocInfo::oop_type) { 1531 if (unload_if_dead_at(&iter, is_alive, unloading_occurred)) { 1532 return true; 1533 } 1534 } 1535 } 1536 } 1537 1538 return do_unloading_scopes(is_alive, unloading_occurred); 1539 } 1540 1541 #if INCLUDE_JVMCI 1542 bool nmethod::do_unloading_jvmci(BoolObjectClosure* is_alive, bool unloading_occurred) { 1543 bool is_unloaded = false; 1544 // Follow JVMCI method 1545 BarrierSet* bs = Universe::heap()->barrier_set(); 1546 if (_jvmci_installed_code != NULL) { 1547 if (_jvmci_installed_code->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(_jvmci_installed_code)) { 1548 if (!is_alive->do_object_b(_jvmci_installed_code)) { 1549 clear_jvmci_installed_code(); 1550 } 1551 } else { 1552 if (can_unload(is_alive, (oop*)&_jvmci_installed_code, unloading_occurred)) { 1553 return true; 1554 } 1555 } 1556 } 1557 1558 if (_speculation_log != NULL) { 1559 if (!is_alive->do_object_b(_speculation_log)) { 1560 bs->write_ref_nmethod_pre(&_speculation_log, this); 1561 _speculation_log = NULL; 1562 bs->write_ref_nmethod_post(&_speculation_log, this); 1563 } 1564 } 1565 return is_unloaded; 1566 } 1567 #endif 1568 1569 // Iterate over metadata calling this function. Used by RedefineClasses 1570 void nmethod::metadata_do(void f(Metadata*)) { 1571 address low_boundary = verified_entry_point(); 1572 if (is_not_entrant()) { 1573 low_boundary += NativeJump::instruction_size; 1574 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1575 // (See comment above.) 1576 } 1577 { 1578 // Visit all immediate references that are embedded in the instruction stream. 1579 RelocIterator iter(this, low_boundary); 1580 while (iter.next()) { 1581 if (iter.type() == relocInfo::metadata_type ) { 1582 metadata_Relocation* r = iter.metadata_reloc(); 1583 // In this metadata, we must only follow those metadatas directly embedded in 1584 // the code. Other metadatas (oop_index>0) are seen as part of 1585 // the metadata section below. 1586 assert(1 == (r->metadata_is_immediate()) + 1587 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()), 1588 "metadata must be found in exactly one place"); 1589 if (r->metadata_is_immediate() && r->metadata_value() != NULL) { 1590 Metadata* md = r->metadata_value(); 1591 if (md != _method) f(md); 1592 } 1593 } else if (iter.type() == relocInfo::virtual_call_type) { 1594 // Check compiledIC holders associated with this nmethod 1595 CompiledIC *ic = CompiledIC_at(&iter); 1596 if (ic->is_icholder_call()) { 1597 CompiledICHolder* cichk = ic->cached_icholder(); 1598 f(cichk->holder_method()); 1599 f(cichk->holder_klass()); 1600 } else { 1601 Metadata* ic_oop = ic->cached_metadata(); 1602 if (ic_oop != NULL) { 1603 f(ic_oop); 1604 } 1605 } 1606 } 1607 } 1608 } 1609 1610 // Visit the metadata section 1611 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) { 1612 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops 1613 Metadata* md = *p; 1614 f(md); 1615 } 1616 1617 // Visit metadata not embedded in the other places. 1618 if (_method != NULL) f(_method); 1619 } 1620 1621 void nmethod::oops_do(OopClosure* f, bool allow_zombie) { 1622 // make sure the oops ready to receive visitors 1623 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod"); 1624 assert(!is_unloaded(), "should not call follow on unloaded nmethod"); 1625 1626 // If the method is not entrant or zombie then a JMP is plastered over the 1627 // first few bytes. If an oop in the old code was there, that oop 1628 // should not get GC'd. Skip the first few bytes of oops on 1629 // not-entrant methods. 1630 address low_boundary = verified_entry_point(); 1631 if (is_not_entrant()) { 1632 low_boundary += NativeJump::instruction_size; 1633 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1634 // (See comment above.) 1635 } 1636 1637 #if INCLUDE_JVMCI 1638 if (_jvmci_installed_code != NULL) { 1639 f->do_oop((oop*) &_jvmci_installed_code); 1640 } 1641 if (_speculation_log != NULL) { 1642 f->do_oop((oop*) &_speculation_log); 1643 } 1644 #endif 1645 1646 RelocIterator iter(this, low_boundary); 1647 1648 while (iter.next()) { 1649 if (iter.type() == relocInfo::oop_type ) { 1650 oop_Relocation* r = iter.oop_reloc(); 1651 // In this loop, we must only follow those oops directly embedded in 1652 // the code. Other oops (oop_index>0) are seen as part of scopes_oops. 1653 assert(1 == (r->oop_is_immediate()) + 1654 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 1655 "oop must be found in exactly one place"); 1656 if (r->oop_is_immediate() && r->oop_value() != NULL) { 1657 f->do_oop(r->oop_addr()); 1658 } 1659 } 1660 } 1661 1662 // Scopes 1663 // This includes oop constants not inlined in the code stream. 1664 for (oop* p = oops_begin(); p < oops_end(); p++) { 1665 if (*p == Universe::non_oop_word()) continue; // skip non-oops 1666 f->do_oop(p); 1667 } 1668 } 1669 1670 #define NMETHOD_SENTINEL ((nmethod*)badAddress) 1671 1672 nmethod* volatile nmethod::_oops_do_mark_nmethods; 1673 1674 // An nmethod is "marked" if its _mark_link is set non-null. 1675 // Even if it is the end of the linked list, it will have a non-null link value, 1676 // as long as it is on the list. 1677 // This code must be MP safe, because it is used from parallel GC passes. 1678 bool nmethod::test_set_oops_do_mark() { 1679 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called"); 1680 nmethod* observed_mark_link = _oops_do_mark_link; 1681 if (observed_mark_link == NULL) { 1682 // Claim this nmethod for this thread to mark. 1683 observed_mark_link = (nmethod*) 1684 Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_link, NULL); 1685 if (observed_mark_link == NULL) { 1686 1687 // Atomically append this nmethod (now claimed) to the head of the list: 1688 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods; 1689 for (;;) { 1690 nmethod* required_mark_nmethods = observed_mark_nmethods; 1691 _oops_do_mark_link = required_mark_nmethods; 1692 observed_mark_nmethods = (nmethod*) 1693 Atomic::cmpxchg_ptr(this, &_oops_do_mark_nmethods, required_mark_nmethods); 1694 if (observed_mark_nmethods == required_mark_nmethods) 1695 break; 1696 } 1697 // Mark was clear when we first saw this guy. 1698 if (TraceScavenge) { print_on(tty, "oops_do, mark"); } 1699 return false; 1700 } 1701 } 1702 // On fall through, another racing thread marked this nmethod before we did. 1703 return true; 1704 } 1705 1706 void nmethod::oops_do_marking_prologue() { 1707 if (TraceScavenge) { tty->print_cr("[oops_do_marking_prologue"); } 1708 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row"); 1709 // We use cmpxchg_ptr instead of regular assignment here because the user 1710 // may fork a bunch of threads, and we need them all to see the same state. 1711 void* observed = Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, NULL); 1712 guarantee(observed == NULL, "no races in this sequential code"); 1713 } 1714 1715 void nmethod::oops_do_marking_epilogue() { 1716 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row"); 1717 nmethod* cur = _oops_do_mark_nmethods; 1718 while (cur != NMETHOD_SENTINEL) { 1719 assert(cur != NULL, "not NULL-terminated"); 1720 nmethod* next = cur->_oops_do_mark_link; 1721 cur->_oops_do_mark_link = NULL; 1722 DEBUG_ONLY(cur->verify_oop_relocations()); 1723 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark")); 1724 cur = next; 1725 } 1726 void* required = _oops_do_mark_nmethods; 1727 void* observed = Atomic::cmpxchg_ptr(NULL, &_oops_do_mark_nmethods, required); 1728 guarantee(observed == required, "no races in this sequential code"); 1729 if (TraceScavenge) { tty->print_cr("oops_do_marking_epilogue]"); } 1730 } 1731 1732 class DetectScavengeRoot: public OopClosure { 1733 bool _detected_scavenge_root; 1734 public: 1735 DetectScavengeRoot() : _detected_scavenge_root(false) 1736 { NOT_PRODUCT(_print_nm = NULL); } 1737 bool detected_scavenge_root() { return _detected_scavenge_root; } 1738 virtual void do_oop(oop* p) { 1739 if ((*p) != NULL && (*p)->is_scavengable()) { 1740 NOT_PRODUCT(maybe_print(p)); 1741 _detected_scavenge_root = true; 1742 } 1743 } 1744 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 1745 1746 #ifndef PRODUCT 1747 nmethod* _print_nm; 1748 void maybe_print(oop* p) { 1749 if (_print_nm == NULL) return; 1750 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root"); 1751 tty->print_cr("" PTR_FORMAT "[offset=%d] detected scavengable oop " PTR_FORMAT " (found at " PTR_FORMAT ")", 1752 p2i(_print_nm), (int)((intptr_t)p - (intptr_t)_print_nm), 1753 p2i(*p), p2i(p)); 1754 (*p)->print(); 1755 } 1756 #endif //PRODUCT 1757 }; 1758 1759 bool nmethod::detect_scavenge_root_oops() { 1760 DetectScavengeRoot detect_scavenge_root; 1761 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this); 1762 oops_do(&detect_scavenge_root); 1763 return detect_scavenge_root.detected_scavenge_root(); 1764 } 1765 1766 inline bool includes(void* p, void* from, void* to) { 1767 return from <= p && p < to; 1768 } 1769 1770 1771 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) { 1772 assert(count >= 2, "must be sentinel values, at least"); 1773 1774 #ifdef ASSERT 1775 // must be sorted and unique; we do a binary search in find_pc_desc() 1776 int prev_offset = pcs[0].pc_offset(); 1777 assert(prev_offset == PcDesc::lower_offset_limit, 1778 "must start with a sentinel"); 1779 for (int i = 1; i < count; i++) { 1780 int this_offset = pcs[i].pc_offset(); 1781 assert(this_offset > prev_offset, "offsets must be sorted"); 1782 prev_offset = this_offset; 1783 } 1784 assert(prev_offset == PcDesc::upper_offset_limit, 1785 "must end with a sentinel"); 1786 #endif //ASSERT 1787 1788 // Search for MethodHandle invokes and tag the nmethod. 1789 for (int i = 0; i < count; i++) { 1790 if (pcs[i].is_method_handle_invoke()) { 1791 set_has_method_handle_invokes(true); 1792 break; 1793 } 1794 } 1795 assert(has_method_handle_invokes() == (_deopt_mh_handler_begin != NULL), "must have deopt mh handler"); 1796 1797 int size = count * sizeof(PcDesc); 1798 assert(scopes_pcs_size() >= size, "oob"); 1799 memcpy(scopes_pcs_begin(), pcs, size); 1800 1801 // Adjust the final sentinel downward. 1802 PcDesc* last_pc = &scopes_pcs_begin()[count-1]; 1803 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity"); 1804 last_pc->set_pc_offset(content_size() + 1); 1805 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) { 1806 // Fill any rounding gaps with copies of the last record. 1807 last_pc[1] = last_pc[0]; 1808 } 1809 // The following assert could fail if sizeof(PcDesc) is not 1810 // an integral multiple of oopSize (the rounding term). 1811 // If it fails, change the logic to always allocate a multiple 1812 // of sizeof(PcDesc), and fill unused words with copies of *last_pc. 1813 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly"); 1814 } 1815 1816 void nmethod::copy_scopes_data(u_char* buffer, int size) { 1817 assert(scopes_data_size() >= size, "oob"); 1818 memcpy(scopes_data_begin(), buffer, size); 1819 } 1820 1821 #ifdef ASSERT 1822 static PcDesc* linear_search(const PcDescSearch& search, int pc_offset, bool approximate) { 1823 PcDesc* lower = search.scopes_pcs_begin(); 1824 PcDesc* upper = search.scopes_pcs_end(); 1825 lower += 1; // exclude initial sentinel 1826 PcDesc* res = NULL; 1827 for (PcDesc* p = lower; p < upper; p++) { 1828 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc 1829 if (match_desc(p, pc_offset, approximate)) { 1830 if (res == NULL) 1831 res = p; 1832 else 1833 res = (PcDesc*) badAddress; 1834 } 1835 } 1836 return res; 1837 } 1838 #endif 1839 1840 1841 // Finds a PcDesc with real-pc equal to "pc" 1842 PcDesc* PcDescContainer::find_pc_desc_internal(address pc, bool approximate, const PcDescSearch& search) { 1843 address base_address = search.code_begin(); 1844 if ((pc < base_address) || 1845 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) { 1846 return NULL; // PC is wildly out of range 1847 } 1848 int pc_offset = (int) (pc - base_address); 1849 1850 // Check the PcDesc cache if it contains the desired PcDesc 1851 // (This as an almost 100% hit rate.) 1852 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate); 1853 if (res != NULL) { 1854 assert(res == linear_search(search, pc_offset, approximate), "cache ok"); 1855 return res; 1856 } 1857 1858 // Fallback algorithm: quasi-linear search for the PcDesc 1859 // Find the last pc_offset less than the given offset. 1860 // The successor must be the required match, if there is a match at all. 1861 // (Use a fixed radix to avoid expensive affine pointer arithmetic.) 1862 PcDesc* lower = search.scopes_pcs_begin(); 1863 PcDesc* upper = search.scopes_pcs_end(); 1864 upper -= 1; // exclude final sentinel 1865 if (lower >= upper) return NULL; // native method; no PcDescs at all 1866 1867 #define assert_LU_OK \ 1868 /* invariant on lower..upper during the following search: */ \ 1869 assert(lower->pc_offset() < pc_offset, "sanity"); \ 1870 assert(upper->pc_offset() >= pc_offset, "sanity") 1871 assert_LU_OK; 1872 1873 // Use the last successful return as a split point. 1874 PcDesc* mid = _pc_desc_cache.last_pc_desc(); 1875 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 1876 if (mid->pc_offset() < pc_offset) { 1877 lower = mid; 1878 } else { 1879 upper = mid; 1880 } 1881 1882 // Take giant steps at first (4096, then 256, then 16, then 1) 1883 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1); 1884 const int RADIX = (1 << LOG2_RADIX); 1885 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) { 1886 while ((mid = lower + step) < upper) { 1887 assert_LU_OK; 1888 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 1889 if (mid->pc_offset() < pc_offset) { 1890 lower = mid; 1891 } else { 1892 upper = mid; 1893 break; 1894 } 1895 } 1896 assert_LU_OK; 1897 } 1898 1899 // Sneak up on the value with a linear search of length ~16. 1900 while (true) { 1901 assert_LU_OK; 1902 mid = lower + 1; 1903 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 1904 if (mid->pc_offset() < pc_offset) { 1905 lower = mid; 1906 } else { 1907 upper = mid; 1908 break; 1909 } 1910 } 1911 #undef assert_LU_OK 1912 1913 if (match_desc(upper, pc_offset, approximate)) { 1914 assert(upper == linear_search(search, pc_offset, approximate), "search ok"); 1915 _pc_desc_cache.add_pc_desc(upper); 1916 return upper; 1917 } else { 1918 assert(NULL == linear_search(search, pc_offset, approximate), "search ok"); 1919 return NULL; 1920 } 1921 } 1922 1923 1924 void nmethod::check_all_dependencies(DepChange& changes) { 1925 // Checked dependencies are allocated into this ResourceMark 1926 ResourceMark rm; 1927 1928 // Turn off dependency tracing while actually testing dependencies. 1929 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) ); 1930 1931 typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash, 1932 &DependencySignature::equals, 11027> DepTable; 1933 1934 DepTable* table = new DepTable(); 1935 1936 // Iterate over live nmethods and check dependencies of all nmethods that are not 1937 // marked for deoptimization. A particular dependency is only checked once. 1938 NMethodIterator iter; 1939 while(iter.next()) { 1940 nmethod* nm = iter.method(); 1941 // Only notify for live nmethods 1942 if (nm->is_alive() && !nm->is_marked_for_deoptimization()) { 1943 for (Dependencies::DepStream deps(nm); deps.next(); ) { 1944 // Construct abstraction of a dependency. 1945 DependencySignature* current_sig = new DependencySignature(deps); 1946 1947 // Determine if dependency is already checked. table->put(...) returns 1948 // 'true' if the dependency is added (i.e., was not in the hashtable). 1949 if (table->put(*current_sig, 1)) { 1950 if (deps.check_dependency() != NULL) { 1951 // Dependency checking failed. Print out information about the failed 1952 // dependency and finally fail with an assert. We can fail here, since 1953 // dependency checking is never done in a product build. 1954 tty->print_cr("Failed dependency:"); 1955 changes.print(); 1956 nm->print(); 1957 nm->print_dependencies(); 1958 assert(false, "Should have been marked for deoptimization"); 1959 } 1960 } 1961 } 1962 } 1963 } 1964 } 1965 1966 bool nmethod::check_dependency_on(DepChange& changes) { 1967 // What has happened: 1968 // 1) a new class dependee has been added 1969 // 2) dependee and all its super classes have been marked 1970 bool found_check = false; // set true if we are upset 1971 for (Dependencies::DepStream deps(this); deps.next(); ) { 1972 // Evaluate only relevant dependencies. 1973 if (deps.spot_check_dependency_at(changes) != NULL) { 1974 found_check = true; 1975 NOT_DEBUG(break); 1976 } 1977 } 1978 return found_check; 1979 } 1980 1981 bool nmethod::is_evol_dependent_on(Klass* dependee) { 1982 InstanceKlass *dependee_ik = InstanceKlass::cast(dependee); 1983 Array<Method*>* dependee_methods = dependee_ik->methods(); 1984 for (Dependencies::DepStream deps(this); deps.next(); ) { 1985 if (deps.type() == Dependencies::evol_method) { 1986 Method* method = deps.method_argument(0); 1987 for (int j = 0; j < dependee_methods->length(); j++) { 1988 if (dependee_methods->at(j) == method) { 1989 if (log_is_enabled(Debug, redefine, class, nmethod)) { 1990 ResourceMark rm; 1991 log_debug(redefine, class, nmethod) 1992 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)", 1993 _method->method_holder()->external_name(), 1994 _method->name()->as_C_string(), 1995 _method->signature()->as_C_string(), 1996 compile_id(), 1997 method->method_holder()->external_name(), 1998 method->name()->as_C_string(), 1999 method->signature()->as_C_string()); 2000 } 2001 if (TraceDependencies || LogCompilation) 2002 deps.log_dependency(dependee); 2003 return true; 2004 } 2005 } 2006 } 2007 } 2008 return false; 2009 } 2010 2011 // Called from mark_for_deoptimization, when dependee is invalidated. 2012 bool nmethod::is_dependent_on_method(Method* dependee) { 2013 for (Dependencies::DepStream deps(this); deps.next(); ) { 2014 if (deps.type() != Dependencies::evol_method) 2015 continue; 2016 Method* method = deps.method_argument(0); 2017 if (method == dependee) return true; 2018 } 2019 return false; 2020 } 2021 2022 2023 bool nmethod::is_patchable_at(address instr_addr) { 2024 assert(insts_contains(instr_addr), "wrong nmethod used"); 2025 if (is_zombie()) { 2026 // a zombie may never be patched 2027 return false; 2028 } 2029 return true; 2030 } 2031 2032 2033 address nmethod::continuation_for_implicit_exception(address pc) { 2034 // Exception happened outside inline-cache check code => we are inside 2035 // an active nmethod => use cpc to determine a return address 2036 int exception_offset = pc - code_begin(); 2037 int cont_offset = ImplicitExceptionTable(this).at( exception_offset ); 2038 #ifdef ASSERT 2039 if (cont_offset == 0) { 2040 Thread* thread = Thread::current(); 2041 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY 2042 HandleMark hm(thread); 2043 ResourceMark rm(thread); 2044 CodeBlob* cb = CodeCache::find_blob(pc); 2045 assert(cb != NULL && cb == this, ""); 2046 ttyLocker ttyl; 2047 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, p2i(pc)); 2048 print(); 2049 method()->print_codes(); 2050 print_code(); 2051 print_pcs(); 2052 } 2053 #endif 2054 if (cont_offset == 0) { 2055 // Let the normal error handling report the exception 2056 return NULL; 2057 } 2058 return code_begin() + cont_offset; 2059 } 2060 2061 2062 2063 void nmethod_init() { 2064 // make sure you didn't forget to adjust the filler fields 2065 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word"); 2066 } 2067 2068 2069 //------------------------------------------------------------------------------------------- 2070 2071 2072 // QQQ might we make this work from a frame?? 2073 nmethodLocker::nmethodLocker(address pc) { 2074 CodeBlob* cb = CodeCache::find_blob(pc); 2075 guarantee(cb != NULL && cb->is_compiled(), "bad pc for a nmethod found"); 2076 _nm = cb->as_compiled_method(); 2077 lock_nmethod(_nm); 2078 } 2079 2080 // Only JvmtiDeferredEvent::compiled_method_unload_event() 2081 // should pass zombie_ok == true. 2082 void nmethodLocker::lock_nmethod(CompiledMethod* cm, bool zombie_ok) { 2083 if (cm == NULL) return; 2084 nmethod* nm = cm->as_nmethod(); 2085 Atomic::inc(&nm->_lock_count); 2086 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method"); 2087 } 2088 2089 void nmethodLocker::unlock_nmethod(CompiledMethod* cm) { 2090 if (cm == NULL) return; 2091 nmethod* nm = cm->as_nmethod(); 2092 Atomic::dec(&nm->_lock_count); 2093 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock"); 2094 } 2095 2096 2097 // ----------------------------------------------------------------------------- 2098 // Verification 2099 2100 class VerifyOopsClosure: public OopClosure { 2101 nmethod* _nm; 2102 bool _ok; 2103 public: 2104 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { } 2105 bool ok() { return _ok; } 2106 virtual void do_oop(oop* p) { 2107 if ((*p) == NULL || (*p)->is_oop()) return; 2108 if (_ok) { 2109 _nm->print_nmethod(true); 2110 _ok = false; 2111 } 2112 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)", 2113 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm)); 2114 } 2115 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2116 }; 2117 2118 void nmethod::verify() { 2119 2120 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant 2121 // seems odd. 2122 2123 if (is_zombie() || is_not_entrant() || is_unloaded()) 2124 return; 2125 2126 // Make sure all the entry points are correctly aligned for patching. 2127 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point()); 2128 2129 // assert(method()->is_oop(), "must be valid"); 2130 2131 ResourceMark rm; 2132 2133 if (!CodeCache::contains(this)) { 2134 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this)); 2135 } 2136 2137 if(is_native_method() ) 2138 return; 2139 2140 nmethod* nm = CodeCache::find_nmethod(verified_entry_point()); 2141 if (nm != this) { 2142 fatal("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this)); 2143 } 2144 2145 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2146 if (! p->verify(this)) { 2147 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this)); 2148 } 2149 } 2150 2151 VerifyOopsClosure voc(this); 2152 oops_do(&voc); 2153 assert(voc.ok(), "embedded oops must be OK"); 2154 verify_scavenge_root_oops(); 2155 2156 verify_scopes(); 2157 } 2158 2159 2160 void nmethod::verify_interrupt_point(address call_site) { 2161 // Verify IC only when nmethod installation is finished. 2162 bool is_installed = (method()->code() == this) // nmethod is in state 'in_use' and installed 2163 || !this->is_in_use(); // nmethod is installed, but not in 'in_use' state 2164 if (is_installed) { 2165 Thread *cur = Thread::current(); 2166 if (CompiledIC_lock->owner() == cur || 2167 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) && 2168 SafepointSynchronize::is_at_safepoint())) { 2169 CompiledIC_at(this, call_site); 2170 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); 2171 } else { 2172 MutexLocker ml_verify (CompiledIC_lock); 2173 CompiledIC_at(this, call_site); 2174 } 2175 } 2176 2177 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address()); 2178 assert(pd != NULL, "PcDesc must exist"); 2179 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(), 2180 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(), 2181 pd->return_oop()); 2182 !sd->is_top(); sd = sd->sender()) { 2183 sd->verify(); 2184 } 2185 } 2186 2187 void nmethod::verify_scopes() { 2188 if( !method() ) return; // Runtime stubs have no scope 2189 if (method()->is_native()) return; // Ignore stub methods. 2190 // iterate through all interrupt point 2191 // and verify the debug information is valid. 2192 RelocIterator iter((nmethod*)this); 2193 while (iter.next()) { 2194 address stub = NULL; 2195 switch (iter.type()) { 2196 case relocInfo::virtual_call_type: 2197 verify_interrupt_point(iter.addr()); 2198 break; 2199 case relocInfo::opt_virtual_call_type: 2200 stub = iter.opt_virtual_call_reloc()->static_stub(); 2201 verify_interrupt_point(iter.addr()); 2202 break; 2203 case relocInfo::static_call_type: 2204 stub = iter.static_call_reloc()->static_stub(); 2205 //verify_interrupt_point(iter.addr()); 2206 break; 2207 case relocInfo::runtime_call_type: 2208 address destination = iter.reloc()->value(); 2209 // Right now there is no way to find out which entries support 2210 // an interrupt point. It would be nice if we had this 2211 // information in a table. 2212 break; 2213 } 2214 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section"); 2215 } 2216 } 2217 2218 2219 // ----------------------------------------------------------------------------- 2220 // Non-product code 2221 #ifndef PRODUCT 2222 2223 class DebugScavengeRoot: public OopClosure { 2224 nmethod* _nm; 2225 bool _ok; 2226 public: 2227 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { } 2228 bool ok() { return _ok; } 2229 virtual void do_oop(oop* p) { 2230 if ((*p) == NULL || !(*p)->is_scavengable()) return; 2231 if (_ok) { 2232 _nm->print_nmethod(true); 2233 _ok = false; 2234 } 2235 tty->print_cr("*** scavengable oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)", 2236 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm)); 2237 (*p)->print(); 2238 } 2239 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2240 }; 2241 2242 void nmethod::verify_scavenge_root_oops() { 2243 if (UseG1GC) { 2244 return; 2245 } 2246 2247 if (!on_scavenge_root_list()) { 2248 // Actually look inside, to verify the claim that it's clean. 2249 DebugScavengeRoot debug_scavenge_root(this); 2250 oops_do(&debug_scavenge_root); 2251 if (!debug_scavenge_root.ok()) 2252 fatal("found an unadvertised bad scavengable oop in the code cache"); 2253 } 2254 assert(scavenge_root_not_marked(), ""); 2255 } 2256 2257 #endif // PRODUCT 2258 2259 // Printing operations 2260 2261 void nmethod::print() const { 2262 ResourceMark rm; 2263 ttyLocker ttyl; // keep the following output all in one block 2264 2265 tty->print("Compiled method "); 2266 2267 if (is_compiled_by_c1()) { 2268 tty->print("(c1) "); 2269 } else if (is_compiled_by_c2()) { 2270 tty->print("(c2) "); 2271 } else if (is_compiled_by_shark()) { 2272 tty->print("(shark) "); 2273 } else if (is_compiled_by_jvmci()) { 2274 tty->print("(JVMCI) "); 2275 } else { 2276 tty->print("(nm) "); 2277 } 2278 2279 print_on(tty, NULL); 2280 2281 if (WizardMode) { 2282 tty->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this)); 2283 tty->print(" for method " INTPTR_FORMAT , p2i(method())); 2284 tty->print(" { "); 2285 tty->print_cr("%s ", state()); 2286 if (on_scavenge_root_list()) tty->print("scavenge_root "); 2287 tty->print_cr("}:"); 2288 } 2289 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2290 p2i(this), 2291 p2i(this) + size(), 2292 size()); 2293 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2294 p2i(relocation_begin()), 2295 p2i(relocation_end()), 2296 relocation_size()); 2297 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2298 p2i(consts_begin()), 2299 p2i(consts_end()), 2300 consts_size()); 2301 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2302 p2i(insts_begin()), 2303 p2i(insts_end()), 2304 insts_size()); 2305 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2306 p2i(stub_begin()), 2307 p2i(stub_end()), 2308 stub_size()); 2309 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2310 p2i(oops_begin()), 2311 p2i(oops_end()), 2312 oops_size()); 2313 if (metadata_size () > 0) tty->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2314 p2i(metadata_begin()), 2315 p2i(metadata_end()), 2316 metadata_size()); 2317 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2318 p2i(scopes_data_begin()), 2319 p2i(scopes_data_end()), 2320 scopes_data_size()); 2321 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2322 p2i(scopes_pcs_begin()), 2323 p2i(scopes_pcs_end()), 2324 scopes_pcs_size()); 2325 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2326 p2i(dependencies_begin()), 2327 p2i(dependencies_end()), 2328 dependencies_size()); 2329 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2330 p2i(handler_table_begin()), 2331 p2i(handler_table_end()), 2332 handler_table_size()); 2333 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2334 p2i(nul_chk_table_begin()), 2335 p2i(nul_chk_table_end()), 2336 nul_chk_table_size()); 2337 } 2338 2339 #ifndef PRODUCT 2340 2341 void nmethod::print_scopes() { 2342 // Find the first pc desc for all scopes in the code and print it. 2343 ResourceMark rm; 2344 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2345 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null) 2346 continue; 2347 2348 ScopeDesc* sd = scope_desc_at(p->real_pc(this)); 2349 while (sd != NULL) { 2350 sd->print_on(tty, p); 2351 sd = sd->sender(); 2352 } 2353 } 2354 } 2355 2356 void nmethod::print_dependencies() { 2357 ResourceMark rm; 2358 ttyLocker ttyl; // keep the following output all in one block 2359 tty->print_cr("Dependencies:"); 2360 for (Dependencies::DepStream deps(this); deps.next(); ) { 2361 deps.print_dependency(); 2362 Klass* ctxk = deps.context_type(); 2363 if (ctxk != NULL) { 2364 if (ctxk->is_instance_klass() && InstanceKlass::cast(ctxk)->is_dependent_nmethod(this)) { 2365 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name()); 2366 } 2367 } 2368 deps.log_dependency(); // put it into the xml log also 2369 } 2370 } 2371 2372 2373 void nmethod::print_relocations() { 2374 ResourceMark m; // in case methods get printed via the debugger 2375 tty->print_cr("relocations:"); 2376 RelocIterator iter(this); 2377 iter.print(); 2378 if (UseRelocIndex) { 2379 jint* index_end = (jint*)relocation_end() - 1; 2380 jint index_size = *index_end; 2381 jint* index_start = (jint*)( (address)index_end - index_size ); 2382 tty->print_cr(" index @" INTPTR_FORMAT ": index_size=%d", p2i(index_start), index_size); 2383 if (index_size > 0) { 2384 jint* ip; 2385 for (ip = index_start; ip+2 <= index_end; ip += 2) 2386 tty->print_cr(" (%d %d) addr=" INTPTR_FORMAT " @" INTPTR_FORMAT, 2387 ip[0], 2388 ip[1], 2389 p2i(header_end()+ip[0]), 2390 p2i(relocation_begin()-1+ip[1])); 2391 for (; ip < index_end; ip++) 2392 tty->print_cr(" (%d ?)", ip[0]); 2393 tty->print_cr(" @" INTPTR_FORMAT ": index_size=%d", p2i(ip), *ip); 2394 ip++; 2395 tty->print_cr("reloc_end @" INTPTR_FORMAT ":", p2i(ip)); 2396 } 2397 } 2398 } 2399 2400 2401 void nmethod::print_pcs() { 2402 ResourceMark m; // in case methods get printed via debugger 2403 tty->print_cr("pc-bytecode offsets:"); 2404 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2405 p->print(this); 2406 } 2407 } 2408 2409 void nmethod::print_recorded_oops() { 2410 tty->print_cr("Recorded oops:"); 2411 for (int i = 0; i < oops_count(); i++) { 2412 oop o = oop_at(i); 2413 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(o)); 2414 if (o == (oop)Universe::non_oop_word()) { 2415 tty->print("non-oop word"); 2416 } else { 2417 o->print_value(); 2418 } 2419 tty->cr(); 2420 } 2421 } 2422 2423 void nmethod::print_recorded_metadata() { 2424 tty->print_cr("Recorded metadata:"); 2425 for (int i = 0; i < metadata_count(); i++) { 2426 Metadata* m = metadata_at(i); 2427 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(m)); 2428 if (m == (Metadata*)Universe::non_oop_word()) { 2429 tty->print("non-metadata word"); 2430 } else { 2431 m->print_value_on_maybe_null(tty); 2432 } 2433 tty->cr(); 2434 } 2435 } 2436 2437 #endif // PRODUCT 2438 2439 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) { 2440 RelocIterator iter(this, begin, end); 2441 bool have_one = false; 2442 while (iter.next()) { 2443 have_one = true; 2444 switch (iter.type()) { 2445 case relocInfo::none: return "no_reloc"; 2446 case relocInfo::oop_type: { 2447 stringStream st; 2448 oop_Relocation* r = iter.oop_reloc(); 2449 oop obj = r->oop_value(); 2450 st.print("oop("); 2451 if (obj == NULL) st.print("NULL"); 2452 else obj->print_value_on(&st); 2453 st.print(")"); 2454 return st.as_string(); 2455 } 2456 case relocInfo::metadata_type: { 2457 stringStream st; 2458 metadata_Relocation* r = iter.metadata_reloc(); 2459 Metadata* obj = r->metadata_value(); 2460 st.print("metadata("); 2461 if (obj == NULL) st.print("NULL"); 2462 else obj->print_value_on(&st); 2463 st.print(")"); 2464 return st.as_string(); 2465 } 2466 case relocInfo::runtime_call_type: { 2467 stringStream st; 2468 st.print("runtime_call"); 2469 runtime_call_Relocation* r = iter.runtime_call_reloc(); 2470 address dest = r->destination(); 2471 CodeBlob* cb = CodeCache::find_blob(dest); 2472 if (cb != NULL) { 2473 st.print(" %s", cb->name()); 2474 } else { 2475 ResourceMark rm; 2476 const int buflen = 1024; 2477 char* buf = NEW_RESOURCE_ARRAY(char, buflen); 2478 int offset; 2479 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) { 2480 st.print(" %s", buf); 2481 if (offset != 0) { 2482 st.print("+%d", offset); 2483 } 2484 } 2485 } 2486 return st.as_string(); 2487 } 2488 case relocInfo::virtual_call_type: { 2489 stringStream st; 2490 st.print_raw("virtual_call"); 2491 virtual_call_Relocation* r = iter.virtual_call_reloc(); 2492 Method* m = r->method_value(); 2493 if (m != NULL) { 2494 assert(m->is_method(), ""); 2495 m->print_short_name(&st); 2496 } 2497 return st.as_string(); 2498 } 2499 case relocInfo::opt_virtual_call_type: { 2500 stringStream st; 2501 st.print_raw("optimized virtual_call"); 2502 opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc(); 2503 Method* m = r->method_value(); 2504 if (m != NULL) { 2505 assert(m->is_method(), ""); 2506 m->print_short_name(&st); 2507 } 2508 return st.as_string(); 2509 } 2510 case relocInfo::static_call_type: { 2511 stringStream st; 2512 st.print_raw("static_call"); 2513 static_call_Relocation* r = iter.static_call_reloc(); 2514 Method* m = r->method_value(); 2515 if (m != NULL) { 2516 assert(m->is_method(), ""); 2517 m->print_short_name(&st); 2518 } 2519 return st.as_string(); 2520 } 2521 case relocInfo::static_stub_type: return "static_stub"; 2522 case relocInfo::external_word_type: return "external_word"; 2523 case relocInfo::internal_word_type: return "internal_word"; 2524 case relocInfo::section_word_type: return "section_word"; 2525 case relocInfo::poll_type: return "poll"; 2526 case relocInfo::poll_return_type: return "poll_return"; 2527 case relocInfo::type_mask: return "type_bit_mask"; 2528 } 2529 } 2530 return have_one ? "other" : NULL; 2531 } 2532 2533 // Return a the last scope in (begin..end] 2534 ScopeDesc* nmethod::scope_desc_in(address begin, address end) { 2535 PcDesc* p = pc_desc_near(begin+1); 2536 if (p != NULL && p->real_pc(this) <= end) { 2537 return new ScopeDesc(this, p->scope_decode_offset(), 2538 p->obj_decode_offset(), p->should_reexecute(), p->rethrow_exception(), 2539 p->return_oop()); 2540 } 2541 return NULL; 2542 } 2543 2544 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const { 2545 if (block_begin == entry_point()) stream->print_cr("[Entry Point]"); 2546 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]"); 2547 if (JVMCI_ONLY(_exception_offset >= 0 &&) block_begin == exception_begin()) stream->print_cr("[Exception Handler]"); 2548 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]"); 2549 if (JVMCI_ONLY(_deopt_handler_begin != NULL &&) block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]"); 2550 2551 if (has_method_handle_invokes()) 2552 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]"); 2553 2554 if (block_begin == consts_begin()) stream->print_cr("[Constants]"); 2555 2556 if (block_begin == entry_point()) { 2557 methodHandle m = method(); 2558 if (m.not_null()) { 2559 stream->print(" # "); 2560 m->print_value_on(stream); 2561 stream->cr(); 2562 } 2563 if (m.not_null() && !is_osr_method()) { 2564 ResourceMark rm; 2565 int sizeargs = m->size_of_parameters(); 2566 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs); 2567 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs); 2568 { 2569 int sig_index = 0; 2570 if (!m->is_static()) 2571 sig_bt[sig_index++] = T_OBJECT; // 'this' 2572 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) { 2573 BasicType t = ss.type(); 2574 sig_bt[sig_index++] = t; 2575 if (type2size[t] == 2) { 2576 sig_bt[sig_index++] = T_VOID; 2577 } else { 2578 assert(type2size[t] == 1, "size is 1 or 2"); 2579 } 2580 } 2581 assert(sig_index == sizeargs, ""); 2582 } 2583 const char* spname = "sp"; // make arch-specific? 2584 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false); 2585 int stack_slot_offset = this->frame_size() * wordSize; 2586 int tab1 = 14, tab2 = 24; 2587 int sig_index = 0; 2588 int arg_index = (m->is_static() ? 0 : -1); 2589 bool did_old_sp = false; 2590 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) { 2591 bool at_this = (arg_index == -1); 2592 bool at_old_sp = false; 2593 BasicType t = (at_this ? T_OBJECT : ss.type()); 2594 assert(t == sig_bt[sig_index], "sigs in sync"); 2595 if (at_this) 2596 stream->print(" # this: "); 2597 else 2598 stream->print(" # parm%d: ", arg_index); 2599 stream->move_to(tab1); 2600 VMReg fst = regs[sig_index].first(); 2601 VMReg snd = regs[sig_index].second(); 2602 if (fst->is_reg()) { 2603 stream->print("%s", fst->name()); 2604 if (snd->is_valid()) { 2605 stream->print(":%s", snd->name()); 2606 } 2607 } else if (fst->is_stack()) { 2608 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset; 2609 if (offset == stack_slot_offset) at_old_sp = true; 2610 stream->print("[%s+0x%x]", spname, offset); 2611 } else { 2612 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd); 2613 } 2614 stream->print(" "); 2615 stream->move_to(tab2); 2616 stream->print("= "); 2617 if (at_this) { 2618 m->method_holder()->print_value_on(stream); 2619 } else { 2620 bool did_name = false; 2621 if (!at_this && ss.is_object()) { 2622 Symbol* name = ss.as_symbol_or_null(); 2623 if (name != NULL) { 2624 name->print_value_on(stream); 2625 did_name = true; 2626 } 2627 } 2628 if (!did_name) 2629 stream->print("%s", type2name(t)); 2630 } 2631 if (at_old_sp) { 2632 stream->print(" (%s of caller)", spname); 2633 did_old_sp = true; 2634 } 2635 stream->cr(); 2636 sig_index += type2size[t]; 2637 arg_index += 1; 2638 if (!at_this) ss.next(); 2639 } 2640 if (!did_old_sp) { 2641 stream->print(" # "); 2642 stream->move_to(tab1); 2643 stream->print("[%s+0x%x]", spname, stack_slot_offset); 2644 stream->print(" (%s of caller)", spname); 2645 stream->cr(); 2646 } 2647 } 2648 } 2649 } 2650 2651 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) { 2652 // First, find an oopmap in (begin, end]. 2653 // We use the odd half-closed interval so that oop maps and scope descs 2654 // which are tied to the byte after a call are printed with the call itself. 2655 address base = code_begin(); 2656 ImmutableOopMapSet* oms = oop_maps(); 2657 if (oms != NULL) { 2658 for (int i = 0, imax = oms->count(); i < imax; i++) { 2659 const ImmutableOopMapPair* pair = oms->pair_at(i); 2660 const ImmutableOopMap* om = pair->get_from(oms); 2661 address pc = base + pair->pc_offset(); 2662 if (pc > begin) { 2663 if (pc <= end) { 2664 st->move_to(column); 2665 st->print("; "); 2666 om->print_on(st); 2667 } 2668 break; 2669 } 2670 } 2671 } 2672 2673 // Print any debug info present at this pc. 2674 ScopeDesc* sd = scope_desc_in(begin, end); 2675 if (sd != NULL) { 2676 st->move_to(column); 2677 if (sd->bci() == SynchronizationEntryBCI) { 2678 st->print(";*synchronization entry"); 2679 } else { 2680 if (sd->method() == NULL) { 2681 st->print("method is NULL"); 2682 } else if (sd->method()->is_native()) { 2683 st->print("method is native"); 2684 } else { 2685 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci()); 2686 st->print(";*%s", Bytecodes::name(bc)); 2687 switch (bc) { 2688 case Bytecodes::_invokevirtual: 2689 case Bytecodes::_invokespecial: 2690 case Bytecodes::_invokestatic: 2691 case Bytecodes::_invokeinterface: 2692 { 2693 Bytecode_invoke invoke(sd->method(), sd->bci()); 2694 st->print(" "); 2695 if (invoke.name() != NULL) 2696 invoke.name()->print_symbol_on(st); 2697 else 2698 st->print("<UNKNOWN>"); 2699 break; 2700 } 2701 case Bytecodes::_getfield: 2702 case Bytecodes::_putfield: 2703 case Bytecodes::_getstatic: 2704 case Bytecodes::_putstatic: 2705 { 2706 Bytecode_field field(sd->method(), sd->bci()); 2707 st->print(" "); 2708 if (field.name() != NULL) 2709 field.name()->print_symbol_on(st); 2710 else 2711 st->print("<UNKNOWN>"); 2712 } 2713 } 2714 } 2715 st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop()); 2716 } 2717 2718 // Print all scopes 2719 for (;sd != NULL; sd = sd->sender()) { 2720 st->move_to(column); 2721 st->print("; -"); 2722 if (sd->method() == NULL) { 2723 st->print("method is NULL"); 2724 } else { 2725 sd->method()->print_short_name(st); 2726 } 2727 int lineno = sd->method()->line_number_from_bci(sd->bci()); 2728 if (lineno != -1) { 2729 st->print("@%d (line %d)", sd->bci(), lineno); 2730 } else { 2731 st->print("@%d", sd->bci()); 2732 } 2733 st->cr(); 2734 } 2735 } 2736 2737 // Print relocation information 2738 const char* str = reloc_string_for(begin, end); 2739 if (str != NULL) { 2740 if (sd != NULL) st->cr(); 2741 st->move_to(column); 2742 st->print("; {%s}", str); 2743 } 2744 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin()); 2745 if (cont_offset != 0) { 2746 st->move_to(column); 2747 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset)); 2748 } 2749 2750 } 2751 2752 #ifndef PRODUCT 2753 2754 void nmethod::print_value_on(outputStream* st) const { 2755 st->print("nmethod"); 2756 print_on(st, NULL); 2757 } 2758 2759 void nmethod::print_calls(outputStream* st) { 2760 RelocIterator iter(this); 2761 while (iter.next()) { 2762 switch (iter.type()) { 2763 case relocInfo::virtual_call_type: 2764 case relocInfo::opt_virtual_call_type: { 2765 VerifyMutexLocker mc(CompiledIC_lock); 2766 CompiledIC_at(&iter)->print(); 2767 break; 2768 } 2769 case relocInfo::static_call_type: 2770 st->print_cr("Static call at " INTPTR_FORMAT, p2i(iter.reloc()->addr())); 2771 compiledStaticCall_at(iter.reloc())->print(); 2772 break; 2773 } 2774 } 2775 } 2776 2777 void nmethod::print_handler_table() { 2778 ExceptionHandlerTable(this).print(); 2779 } 2780 2781 void nmethod::print_nul_chk_table() { 2782 ImplicitExceptionTable(this).print(code_begin()); 2783 } 2784 2785 void nmethod::print_statistics() { 2786 ttyLocker ttyl; 2787 if (xtty != NULL) xtty->head("statistics type='nmethod'"); 2788 native_nmethod_stats.print_native_nmethod_stats(); 2789 #ifdef COMPILER1 2790 c1_java_nmethod_stats.print_nmethod_stats("C1"); 2791 #endif 2792 #ifdef COMPILER2 2793 c2_java_nmethod_stats.print_nmethod_stats("C2"); 2794 #endif 2795 #if INCLUDE_JVMCI 2796 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI"); 2797 #endif 2798 #ifdef SHARK 2799 shark_java_nmethod_stats.print_nmethod_stats("Shark"); 2800 #endif 2801 unknown_java_nmethod_stats.print_nmethod_stats("Unknown"); 2802 DebugInformationRecorder::print_statistics(); 2803 #ifndef PRODUCT 2804 pc_nmethod_stats.print_pc_stats(); 2805 #endif 2806 Dependencies::print_statistics(); 2807 if (xtty != NULL) xtty->tail("statistics"); 2808 } 2809 2810 #endif // !PRODUCT 2811 2812 #if INCLUDE_JVMCI 2813 void nmethod::clear_jvmci_installed_code() { 2814 // write_ref_method_pre/post can only be safely called at a 2815 // safepoint or while holding the CodeCache_lock 2816 assert(CodeCache_lock->is_locked() || 2817 SafepointSynchronize::is_at_safepoint(), "should be performed under a lock for consistency"); 2818 if (_jvmci_installed_code != NULL) { 2819 // This must be done carefully to maintain nmethod remembered sets properly 2820 BarrierSet* bs = Universe::heap()->barrier_set(); 2821 bs->write_ref_nmethod_pre(&_jvmci_installed_code, this); 2822 _jvmci_installed_code = NULL; 2823 bs->write_ref_nmethod_post(&_jvmci_installed_code, this); 2824 } 2825 } 2826 2827 void nmethod::maybe_invalidate_installed_code() { 2828 assert(Patching_lock->is_locked() || 2829 SafepointSynchronize::is_at_safepoint(), "should be performed under a lock for consistency"); 2830 oop installed_code = jvmci_installed_code(); 2831 if (installed_code != NULL) { 2832 nmethod* nm = (nmethod*)InstalledCode::address(installed_code); 2833 if (nm == NULL || nm != this) { 2834 // The link has been broken or the InstalledCode instance is 2835 // associated with another nmethod so do nothing. 2836 return; 2837 } 2838 if (!is_alive()) { 2839 // Break the link between nmethod and InstalledCode such that the nmethod 2840 // can subsequently be flushed safely. The link must be maintained while 2841 // the method could have live activations since invalidateInstalledCode 2842 // might want to invalidate all existing activations. 2843 InstalledCode::set_address(installed_code, 0); 2844 InstalledCode::set_entryPoint(installed_code, 0); 2845 } else if (is_not_entrant()) { 2846 // Remove the entry point so any invocation will fail but keep 2847 // the address link around that so that existing activations can 2848 // be invalidated. 2849 InstalledCode::set_entryPoint(installed_code, 0); 2850 } 2851 } 2852 } 2853 2854 void nmethod::invalidate_installed_code(Handle installedCode, TRAPS) { 2855 if (installedCode() == NULL) { 2856 THROW(vmSymbols::java_lang_NullPointerException()); 2857 } 2858 jlong nativeMethod = InstalledCode::address(installedCode); 2859 nmethod* nm = (nmethod*)nativeMethod; 2860 if (nm == NULL) { 2861 // Nothing to do 2862 return; 2863 } 2864 2865 nmethodLocker nml(nm); 2866 #ifdef ASSERT 2867 { 2868 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 2869 // This relationship can only be checked safely under a lock 2870 assert(nm == NULL || !nm->is_alive() || nm->jvmci_installed_code() == installedCode(), "sanity check"); 2871 } 2872 #endif 2873 2874 if (nm->is_alive()) { 2875 // The nmethod state machinery maintains the link between the 2876 // HotSpotInstalledCode and nmethod* so as long as the nmethod appears to be 2877 // alive assume there is work to do and deoptimize the nmethod. 2878 nm->mark_for_deoptimization(); 2879 VM_Deoptimize op; 2880 VMThread::execute(&op); 2881 } 2882 2883 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 2884 // Check that it's still associated with the same nmethod and break 2885 // the link if it is. 2886 if (InstalledCode::address(installedCode) == nativeMethod) { 2887 InstalledCode::set_address(installedCode, 0); 2888 } 2889 } 2890 2891 char* nmethod::jvmci_installed_code_name(char* buf, size_t buflen) { 2892 if (!this->is_compiled_by_jvmci()) { 2893 return NULL; 2894 } 2895 oop installedCode = this->jvmci_installed_code(); 2896 if (installedCode != NULL) { 2897 oop installedCodeName = NULL; 2898 if (installedCode->is_a(InstalledCode::klass())) { 2899 installedCodeName = InstalledCode::name(installedCode); 2900 } 2901 if (installedCodeName != NULL) { 2902 return java_lang_String::as_utf8_string(installedCodeName, buf, (int)buflen); 2903 } else { 2904 jio_snprintf(buf, buflen, "null"); 2905 return buf; 2906 } 2907 } 2908 jio_snprintf(buf, buflen, "noInstalledCode"); 2909 return buf; 2910 } 2911 #endif 2912