1 /* 2 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "jvm.h" 27 #include "code/codeCache.hpp" 28 #include "code/compiledIC.hpp" 29 #include "code/dependencies.hpp" 30 #include "code/nativeInst.hpp" 31 #include "code/nmethod.hpp" 32 #include "code/scopeDesc.hpp" 33 #include "compiler/abstractCompiler.hpp" 34 #include "compiler/compileBroker.hpp" 35 #include "compiler/compileLog.hpp" 36 #include "compiler/compilerDirectives.hpp" 37 #include "compiler/directivesParser.hpp" 38 #include "compiler/disassembler.hpp" 39 #include "interpreter/bytecode.hpp" 40 #include "logging/log.hpp" 41 #include "logging/logStream.hpp" 42 #include "memory/resourceArea.hpp" 43 #include "oops/methodData.hpp" 44 #include "oops/oop.inline.hpp" 45 #include "prims/jvmtiImpl.hpp" 46 #include "runtime/atomic.hpp" 47 #include "runtime/orderAccess.inline.hpp" 48 #include "runtime/os.hpp" 49 #include "runtime/sharedRuntime.hpp" 50 #include "runtime/sweeper.hpp" 51 #include "utilities/align.hpp" 52 #include "utilities/dtrace.hpp" 53 #include "utilities/events.hpp" 54 #include "utilities/resourceHash.hpp" 55 #include "utilities/xmlstream.hpp" 56 #if INCLUDE_JVMCI 57 #include "jvmci/jvmciJavaClasses.hpp" 58 #endif 59 60 #ifdef DTRACE_ENABLED 61 62 // Only bother with this argument setup if dtrace is available 63 64 #define DTRACE_METHOD_UNLOAD_PROBE(method) \ 65 { \ 66 Method* m = (method); \ 67 if (m != NULL) { \ 68 Symbol* klass_name = m->klass_name(); \ 69 Symbol* name = m->name(); \ 70 Symbol* signature = m->signature(); \ 71 HOTSPOT_COMPILED_METHOD_UNLOAD( \ 72 (char *) klass_name->bytes(), klass_name->utf8_length(), \ 73 (char *) name->bytes(), name->utf8_length(), \ 74 (char *) signature->bytes(), signature->utf8_length()); \ 75 } \ 76 } 77 78 #else // ndef DTRACE_ENABLED 79 80 #define DTRACE_METHOD_UNLOAD_PROBE(method) 81 82 #endif 83 84 //--------------------------------------------------------------------------------- 85 // NMethod statistics 86 // They are printed under various flags, including: 87 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation. 88 // (In the latter two cases, they like other stats are printed to the log only.) 89 90 #ifndef PRODUCT 91 // These variables are put into one block to reduce relocations 92 // and make it simpler to print from the debugger. 93 struct java_nmethod_stats_struct { 94 int nmethod_count; 95 int total_size; 96 int relocation_size; 97 int consts_size; 98 int insts_size; 99 int stub_size; 100 int scopes_data_size; 101 int scopes_pcs_size; 102 int dependencies_size; 103 int handler_table_size; 104 int nul_chk_table_size; 105 int oops_size; 106 int metadata_size; 107 108 void note_nmethod(nmethod* nm) { 109 nmethod_count += 1; 110 total_size += nm->size(); 111 relocation_size += nm->relocation_size(); 112 consts_size += nm->consts_size(); 113 insts_size += nm->insts_size(); 114 stub_size += nm->stub_size(); 115 oops_size += nm->oops_size(); 116 metadata_size += nm->metadata_size(); 117 scopes_data_size += nm->scopes_data_size(); 118 scopes_pcs_size += nm->scopes_pcs_size(); 119 dependencies_size += nm->dependencies_size(); 120 handler_table_size += nm->handler_table_size(); 121 nul_chk_table_size += nm->nul_chk_table_size(); 122 } 123 void print_nmethod_stats(const char* name) { 124 if (nmethod_count == 0) return; 125 tty->print_cr("Statistics for %d bytecoded nmethods for %s:", nmethod_count, name); 126 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size); 127 if (nmethod_count != 0) tty->print_cr(" header = " SIZE_FORMAT, nmethod_count * sizeof(nmethod)); 128 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size); 129 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size); 130 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size); 131 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size); 132 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size); 133 if (metadata_size != 0) tty->print_cr(" metadata = %d", metadata_size); 134 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size); 135 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size); 136 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size); 137 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size); 138 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size); 139 } 140 }; 141 142 struct native_nmethod_stats_struct { 143 int native_nmethod_count; 144 int native_total_size; 145 int native_relocation_size; 146 int native_insts_size; 147 int native_oops_size; 148 int native_metadata_size; 149 void note_native_nmethod(nmethod* nm) { 150 native_nmethod_count += 1; 151 native_total_size += nm->size(); 152 native_relocation_size += nm->relocation_size(); 153 native_insts_size += nm->insts_size(); 154 native_oops_size += nm->oops_size(); 155 native_metadata_size += nm->metadata_size(); 156 } 157 void print_native_nmethod_stats() { 158 if (native_nmethod_count == 0) return; 159 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count); 160 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size); 161 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size); 162 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size); 163 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size); 164 if (native_metadata_size != 0) tty->print_cr(" N. metadata = %d", native_metadata_size); 165 } 166 }; 167 168 struct pc_nmethod_stats_struct { 169 int pc_desc_resets; // number of resets (= number of caches) 170 int pc_desc_queries; // queries to nmethod::find_pc_desc 171 int pc_desc_approx; // number of those which have approximate true 172 int pc_desc_repeats; // number of _pc_descs[0] hits 173 int pc_desc_hits; // number of LRU cache hits 174 int pc_desc_tests; // total number of PcDesc examinations 175 int pc_desc_searches; // total number of quasi-binary search steps 176 int pc_desc_adds; // number of LUR cache insertions 177 178 void print_pc_stats() { 179 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query", 180 pc_desc_queries, 181 (double)(pc_desc_tests + pc_desc_searches) 182 / pc_desc_queries); 183 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d", 184 pc_desc_resets, 185 pc_desc_queries, pc_desc_approx, 186 pc_desc_repeats, pc_desc_hits, 187 pc_desc_tests, pc_desc_searches, pc_desc_adds); 188 } 189 }; 190 191 #ifdef COMPILER1 192 static java_nmethod_stats_struct c1_java_nmethod_stats; 193 #endif 194 #ifdef COMPILER2 195 static java_nmethod_stats_struct c2_java_nmethod_stats; 196 #endif 197 #if INCLUDE_JVMCI 198 static java_nmethod_stats_struct jvmci_java_nmethod_stats; 199 #endif 200 static java_nmethod_stats_struct unknown_java_nmethod_stats; 201 202 static native_nmethod_stats_struct native_nmethod_stats; 203 static pc_nmethod_stats_struct pc_nmethod_stats; 204 205 static void note_java_nmethod(nmethod* nm) { 206 #ifdef COMPILER1 207 if (nm->is_compiled_by_c1()) { 208 c1_java_nmethod_stats.note_nmethod(nm); 209 } else 210 #endif 211 #ifdef COMPILER2 212 if (nm->is_compiled_by_c2()) { 213 c2_java_nmethod_stats.note_nmethod(nm); 214 } else 215 #endif 216 #if INCLUDE_JVMCI 217 if (nm->is_compiled_by_jvmci()) { 218 jvmci_java_nmethod_stats.note_nmethod(nm); 219 } else 220 #endif 221 { 222 unknown_java_nmethod_stats.note_nmethod(nm); 223 } 224 } 225 #endif // !PRODUCT 226 227 //--------------------------------------------------------------------------------- 228 229 230 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) { 231 assert(pc != NULL, "Must be non null"); 232 assert(exception.not_null(), "Must be non null"); 233 assert(handler != NULL, "Must be non null"); 234 235 _count = 0; 236 _exception_type = exception->klass(); 237 _next = NULL; 238 239 add_address_and_handler(pc,handler); 240 } 241 242 243 address ExceptionCache::match(Handle exception, address pc) { 244 assert(pc != NULL,"Must be non null"); 245 assert(exception.not_null(),"Must be non null"); 246 if (exception->klass() == exception_type()) { 247 return (test_address(pc)); 248 } 249 250 return NULL; 251 } 252 253 254 bool ExceptionCache::match_exception_with_space(Handle exception) { 255 assert(exception.not_null(),"Must be non null"); 256 if (exception->klass() == exception_type() && count() < cache_size) { 257 return true; 258 } 259 return false; 260 } 261 262 263 address ExceptionCache::test_address(address addr) { 264 int limit = count(); 265 for (int i = 0; i < limit; i++) { 266 if (pc_at(i) == addr) { 267 return handler_at(i); 268 } 269 } 270 return NULL; 271 } 272 273 274 bool ExceptionCache::add_address_and_handler(address addr, address handler) { 275 if (test_address(addr) == handler) return true; 276 277 int index = count(); 278 if (index < cache_size) { 279 set_pc_at(index, addr); 280 set_handler_at(index, handler); 281 increment_count(); 282 return true; 283 } 284 return false; 285 } 286 287 //----------------------------------------------------------------------------- 288 289 290 // Helper used by both find_pc_desc methods. 291 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) { 292 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_tests); 293 if (!approximate) 294 return pc->pc_offset() == pc_offset; 295 else 296 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset(); 297 } 298 299 void PcDescCache::reset_to(PcDesc* initial_pc_desc) { 300 if (initial_pc_desc == NULL) { 301 _pc_descs[0] = NULL; // native method; no PcDescs at all 302 return; 303 } 304 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_resets); 305 // reset the cache by filling it with benign (non-null) values 306 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel"); 307 for (int i = 0; i < cache_size; i++) 308 _pc_descs[i] = initial_pc_desc; 309 } 310 311 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) { 312 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_queries); 313 NOT_PRODUCT(if (approximate) ++pc_nmethod_stats.pc_desc_approx); 314 315 // Note: one might think that caching the most recently 316 // read value separately would be a win, but one would be 317 // wrong. When many threads are updating it, the cache 318 // line it's in would bounce between caches, negating 319 // any benefit. 320 321 // In order to prevent race conditions do not load cache elements 322 // repeatedly, but use a local copy: 323 PcDesc* res; 324 325 // Step one: Check the most recently added value. 326 res = _pc_descs[0]; 327 if (res == NULL) return NULL; // native method; no PcDescs at all 328 if (match_desc(res, pc_offset, approximate)) { 329 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_repeats); 330 return res; 331 } 332 333 // Step two: Check the rest of the LRU cache. 334 for (int i = 1; i < cache_size; ++i) { 335 res = _pc_descs[i]; 336 if (res->pc_offset() < 0) break; // optimization: skip empty cache 337 if (match_desc(res, pc_offset, approximate)) { 338 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_hits); 339 return res; 340 } 341 } 342 343 // Report failure. 344 return NULL; 345 } 346 347 void PcDescCache::add_pc_desc(PcDesc* pc_desc) { 348 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_adds); 349 // Update the LRU cache by shifting pc_desc forward. 350 for (int i = 0; i < cache_size; i++) { 351 PcDesc* next = _pc_descs[i]; 352 _pc_descs[i] = pc_desc; 353 pc_desc = next; 354 } 355 } 356 357 // adjust pcs_size so that it is a multiple of both oopSize and 358 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple 359 // of oopSize, then 2*sizeof(PcDesc) is) 360 static int adjust_pcs_size(int pcs_size) { 361 int nsize = align_up(pcs_size, oopSize); 362 if ((nsize % sizeof(PcDesc)) != 0) { 363 nsize = pcs_size + sizeof(PcDesc); 364 } 365 assert((nsize % oopSize) == 0, "correct alignment"); 366 return nsize; 367 } 368 369 370 int nmethod::total_size() const { 371 return 372 consts_size() + 373 insts_size() + 374 stub_size() + 375 scopes_data_size() + 376 scopes_pcs_size() + 377 handler_table_size() + 378 nul_chk_table_size(); 379 } 380 381 const char* nmethod::compile_kind() const { 382 if (is_osr_method()) return "osr"; 383 if (method() != NULL && is_native_method()) return "c2n"; 384 return NULL; 385 } 386 387 // Fill in default values for various flag fields 388 void nmethod::init_defaults() { 389 _state = not_installed; 390 _has_flushed_dependencies = 0; 391 _lock_count = 0; 392 _stack_traversal_mark = 0; 393 _unload_reported = false; // jvmti state 394 _is_far_code = false; // nmethods are located in CodeCache 395 396 #ifdef ASSERT 397 _oops_are_stale = false; 398 #endif 399 400 _oops_do_mark_link = NULL; 401 _jmethod_id = NULL; 402 _osr_link = NULL; 403 _unloading_next = NULL; 404 _scavenge_root_link = NULL; 405 _scavenge_root_state = 0; 406 #if INCLUDE_RTM_OPT 407 _rtm_state = NoRTM; 408 #endif 409 #if INCLUDE_JVMCI 410 _jvmci_installed_code = NULL; 411 _speculation_log = NULL; 412 _jvmci_installed_code_triggers_unloading = false; 413 #endif 414 } 415 416 nmethod* nmethod::new_native_nmethod(const methodHandle& method, 417 int compile_id, 418 CodeBuffer *code_buffer, 419 int vep_offset, 420 int frame_complete, 421 int frame_size, 422 ByteSize basic_lock_owner_sp_offset, 423 ByteSize basic_lock_sp_offset, 424 OopMapSet* oop_maps) { 425 code_buffer->finalize_oop_references(method); 426 // create nmethod 427 nmethod* nm = NULL; 428 { 429 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 430 int native_nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod)); 431 CodeOffsets offsets; 432 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset); 433 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete); 434 nm = new (native_nmethod_size, CompLevel_none) nmethod(method(), compiler_none, native_nmethod_size, 435 compile_id, &offsets, 436 code_buffer, frame_size, 437 basic_lock_owner_sp_offset, 438 basic_lock_sp_offset, oop_maps); 439 NOT_PRODUCT(if (nm != NULL) native_nmethod_stats.note_native_nmethod(nm)); 440 } 441 // verify nmethod 442 debug_only(if (nm) nm->verify();) // might block 443 444 if (nm != NULL) { 445 nm->log_new_nmethod(); 446 } 447 448 nm->make_in_use(); 449 return nm; 450 } 451 452 nmethod* nmethod::new_nmethod(const methodHandle& method, 453 int compile_id, 454 int entry_bci, 455 CodeOffsets* offsets, 456 int orig_pc_offset, 457 DebugInformationRecorder* debug_info, 458 Dependencies* dependencies, 459 CodeBuffer* code_buffer, int frame_size, 460 OopMapSet* oop_maps, 461 ExceptionHandlerTable* handler_table, 462 ImplicitExceptionTable* nul_chk_table, 463 AbstractCompiler* compiler, 464 int comp_level 465 #if INCLUDE_JVMCI 466 , jweak installed_code, 467 jweak speculationLog 468 #endif 469 ) 470 { 471 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); 472 code_buffer->finalize_oop_references(method); 473 // create nmethod 474 nmethod* nm = NULL; 475 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 476 int nmethod_size = 477 CodeBlob::allocation_size(code_buffer, sizeof(nmethod)) 478 + adjust_pcs_size(debug_info->pcs_size()) 479 + align_up((int)dependencies->size_in_bytes(), oopSize) 480 + align_up(handler_table->size_in_bytes() , oopSize) 481 + align_up(nul_chk_table->size_in_bytes() , oopSize) 482 + align_up(debug_info->data_size() , oopSize); 483 484 nm = new (nmethod_size, comp_level) 485 nmethod(method(), compiler->type(), nmethod_size, compile_id, entry_bci, offsets, 486 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size, 487 oop_maps, 488 handler_table, 489 nul_chk_table, 490 compiler, 491 comp_level 492 #if INCLUDE_JVMCI 493 , installed_code, 494 speculationLog 495 #endif 496 ); 497 498 if (nm != NULL) { 499 // To make dependency checking during class loading fast, record 500 // the nmethod dependencies in the classes it is dependent on. 501 // This allows the dependency checking code to simply walk the 502 // class hierarchy above the loaded class, checking only nmethods 503 // which are dependent on those classes. The slow way is to 504 // check every nmethod for dependencies which makes it linear in 505 // the number of methods compiled. For applications with a lot 506 // classes the slow way is too slow. 507 for (Dependencies::DepStream deps(nm); deps.next(); ) { 508 if (deps.type() == Dependencies::call_site_target_value) { 509 // CallSite dependencies are managed on per-CallSite instance basis. 510 oop call_site = deps.argument_oop(0); 511 MethodHandles::add_dependent_nmethod(call_site, nm); 512 } else { 513 Klass* klass = deps.context_type(); 514 if (klass == NULL) { 515 continue; // ignore things like evol_method 516 } 517 // record this nmethod as dependent on this klass 518 InstanceKlass::cast(klass)->add_dependent_nmethod(nm); 519 } 520 } 521 NOT_PRODUCT(if (nm != NULL) note_java_nmethod(nm)); 522 } 523 } 524 // Do verification and logging outside CodeCache_lock. 525 if (nm != NULL) { 526 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet. 527 DEBUG_ONLY(nm->verify();) 528 nm->log_new_nmethod(); 529 } 530 return nm; 531 } 532 533 // For native wrappers 534 nmethod::nmethod( 535 Method* method, 536 CompilerType type, 537 int nmethod_size, 538 int compile_id, 539 CodeOffsets* offsets, 540 CodeBuffer* code_buffer, 541 int frame_size, 542 ByteSize basic_lock_owner_sp_offset, 543 ByteSize basic_lock_sp_offset, 544 OopMapSet* oop_maps ) 545 : CompiledMethod(method, "native nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false), 546 _native_receiver_sp_offset(basic_lock_owner_sp_offset), 547 _native_basic_lock_sp_offset(basic_lock_sp_offset) 548 { 549 { 550 int scopes_data_offset = 0; 551 int deoptimize_offset = 0; 552 int deoptimize_mh_offset = 0; 553 554 debug_only(NoSafepointVerifier nsv;) 555 assert_locked_or_safepoint(CodeCache_lock); 556 557 init_defaults(); 558 _entry_bci = InvocationEntryBci; 559 // We have no exception handler or deopt handler make the 560 // values something that will never match a pc like the nmethod vtable entry 561 _exception_offset = 0; 562 _orig_pc_offset = 0; 563 564 _consts_offset = data_offset(); 565 _stub_offset = data_offset(); 566 _oops_offset = data_offset(); 567 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize); 568 scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize); 569 _scopes_pcs_offset = scopes_data_offset; 570 _dependencies_offset = _scopes_pcs_offset; 571 _handler_table_offset = _dependencies_offset; 572 _nul_chk_table_offset = _handler_table_offset; 573 _nmethod_end_offset = _nul_chk_table_offset; 574 _compile_id = compile_id; 575 _comp_level = CompLevel_none; 576 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 577 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 578 _osr_entry_point = NULL; 579 _exception_cache = NULL; 580 _pc_desc_container.reset_to(NULL); 581 _hotness_counter = NMethodSweeper::hotness_counter_reset_val(); 582 583 _scopes_data_begin = (address) this + scopes_data_offset; 584 _deopt_handler_begin = (address) this + deoptimize_offset; 585 _deopt_mh_handler_begin = (address) this + deoptimize_mh_offset; 586 587 code_buffer->copy_code_and_locs_to(this); 588 code_buffer->copy_values_to(this); 589 if (ScavengeRootsInCode) { 590 Universe::heap()->register_nmethod(this); 591 } 592 debug_only(Universe::heap()->verify_nmethod(this)); 593 CodeCache::commit(this); 594 } 595 596 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) { 597 ttyLocker ttyl; // keep the following output all in one block 598 // This output goes directly to the tty, not the compiler log. 599 // To enable tools to match it up with the compilation activity, 600 // be sure to tag this tty output with the compile ID. 601 if (xtty != NULL) { 602 xtty->begin_head("print_native_nmethod"); 603 xtty->method(_method); 604 xtty->stamp(); 605 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this); 606 } 607 // print the header part first 608 print(); 609 // then print the requested information 610 if (PrintNativeNMethods) { 611 print_code(); 612 if (oop_maps != NULL) { 613 oop_maps->print(); 614 } 615 } 616 if (PrintRelocations) { 617 print_relocations(); 618 } 619 if (xtty != NULL) { 620 xtty->tail("print_native_nmethod"); 621 } 622 } 623 } 624 625 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () { 626 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level)); 627 } 628 629 nmethod::nmethod( 630 Method* method, 631 CompilerType type, 632 int nmethod_size, 633 int compile_id, 634 int entry_bci, 635 CodeOffsets* offsets, 636 int orig_pc_offset, 637 DebugInformationRecorder* debug_info, 638 Dependencies* dependencies, 639 CodeBuffer *code_buffer, 640 int frame_size, 641 OopMapSet* oop_maps, 642 ExceptionHandlerTable* handler_table, 643 ImplicitExceptionTable* nul_chk_table, 644 AbstractCompiler* compiler, 645 int comp_level 646 #if INCLUDE_JVMCI 647 , jweak installed_code, 648 jweak speculation_log 649 #endif 650 ) 651 : CompiledMethod(method, "nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false), 652 _native_receiver_sp_offset(in_ByteSize(-1)), 653 _native_basic_lock_sp_offset(in_ByteSize(-1)) 654 { 655 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); 656 { 657 debug_only(NoSafepointVerifier nsv;) 658 assert_locked_or_safepoint(CodeCache_lock); 659 660 _deopt_handler_begin = (address) this; 661 _deopt_mh_handler_begin = (address) this; 662 663 init_defaults(); 664 _entry_bci = entry_bci; 665 _compile_id = compile_id; 666 _comp_level = comp_level; 667 _orig_pc_offset = orig_pc_offset; 668 _hotness_counter = NMethodSweeper::hotness_counter_reset_val(); 669 670 // Section offsets 671 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts()); 672 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs()); 673 set_ctable_begin(header_begin() + _consts_offset); 674 675 #if INCLUDE_JVMCI 676 _jvmci_installed_code = installed_code; 677 _speculation_log = speculation_log; 678 oop obj = JNIHandles::resolve(installed_code); 679 if (obj == NULL || (obj->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(obj))) { 680 _jvmci_installed_code_triggers_unloading = false; 681 } else { 682 _jvmci_installed_code_triggers_unloading = true; 683 } 684 685 if (compiler->is_jvmci()) { 686 // JVMCI might not produce any stub sections 687 if (offsets->value(CodeOffsets::Exceptions) != -1) { 688 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions); 689 } else { 690 _exception_offset = -1; 691 } 692 if (offsets->value(CodeOffsets::Deopt) != -1) { 693 _deopt_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::Deopt); 694 } else { 695 _deopt_handler_begin = NULL; 696 } 697 if (offsets->value(CodeOffsets::DeoptMH) != -1) { 698 _deopt_mh_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::DeoptMH); 699 } else { 700 _deopt_mh_handler_begin = NULL; 701 } 702 } else { 703 #endif 704 // Exception handler and deopt handler are in the stub section 705 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set"); 706 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set"); 707 708 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions); 709 _deopt_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::Deopt); 710 if (offsets->value(CodeOffsets::DeoptMH) != -1) { 711 _deopt_mh_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::DeoptMH); 712 } else { 713 _deopt_mh_handler_begin = NULL; 714 #if INCLUDE_JVMCI 715 } 716 #endif 717 } 718 if (offsets->value(CodeOffsets::UnwindHandler) != -1) { 719 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler); 720 } else { 721 _unwind_handler_offset = -1; 722 } 723 724 _oops_offset = data_offset(); 725 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize); 726 int scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize); 727 728 _scopes_pcs_offset = scopes_data_offset + align_up(debug_info->data_size (), oopSize); 729 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size()); 730 _handler_table_offset = _dependencies_offset + align_up((int)dependencies->size_in_bytes (), oopSize); 731 _nul_chk_table_offset = _handler_table_offset + align_up(handler_table->size_in_bytes(), oopSize); 732 _nmethod_end_offset = _nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize); 733 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 734 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 735 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry); 736 _exception_cache = NULL; 737 738 _scopes_data_begin = (address) this + scopes_data_offset; 739 740 _pc_desc_container.reset_to(scopes_pcs_begin()); 741 742 code_buffer->copy_code_and_locs_to(this); 743 // Copy contents of ScopeDescRecorder to nmethod 744 code_buffer->copy_values_to(this); 745 debug_info->copy_to(this); 746 dependencies->copy_to(this); 747 if (ScavengeRootsInCode) { 748 Universe::heap()->register_nmethod(this); 749 } 750 debug_only(Universe::heap()->verify_nmethod(this)); 751 752 CodeCache::commit(this); 753 754 // Copy contents of ExceptionHandlerTable to nmethod 755 handler_table->copy_to(this); 756 nul_chk_table->copy_to(this); 757 758 // we use the information of entry points to find out if a method is 759 // static or non static 760 assert(compiler->is_c2() || compiler->is_jvmci() || 761 _method->is_static() == (entry_point() == _verified_entry_point), 762 " entry points must be same for static methods and vice versa"); 763 } 764 } 765 766 // Print a short set of xml attributes to identify this nmethod. The 767 // output should be embedded in some other element. 768 void nmethod::log_identity(xmlStream* log) const { 769 log->print(" compile_id='%d'", compile_id()); 770 const char* nm_kind = compile_kind(); 771 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind); 772 log->print(" compiler='%s'", compiler_name()); 773 if (TieredCompilation) { 774 log->print(" level='%d'", comp_level()); 775 } 776 } 777 778 779 #define LOG_OFFSET(log, name) \ 780 if (p2i(name##_end()) - p2i(name##_begin())) \ 781 log->print(" " XSTR(name) "_offset='" INTX_FORMAT "'" , \ 782 p2i(name##_begin()) - p2i(this)) 783 784 785 void nmethod::log_new_nmethod() const { 786 if (LogCompilation && xtty != NULL) { 787 ttyLocker ttyl; 788 HandleMark hm; 789 xtty->begin_elem("nmethod"); 790 log_identity(xtty); 791 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size()); 792 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this)); 793 794 LOG_OFFSET(xtty, relocation); 795 LOG_OFFSET(xtty, consts); 796 LOG_OFFSET(xtty, insts); 797 LOG_OFFSET(xtty, stub); 798 LOG_OFFSET(xtty, scopes_data); 799 LOG_OFFSET(xtty, scopes_pcs); 800 LOG_OFFSET(xtty, dependencies); 801 LOG_OFFSET(xtty, handler_table); 802 LOG_OFFSET(xtty, nul_chk_table); 803 LOG_OFFSET(xtty, oops); 804 LOG_OFFSET(xtty, metadata); 805 806 xtty->method(method()); 807 xtty->stamp(); 808 xtty->end_elem(); 809 } 810 } 811 812 #undef LOG_OFFSET 813 814 815 // Print out more verbose output usually for a newly created nmethod. 816 void nmethod::print_on(outputStream* st, const char* msg) const { 817 if (st != NULL) { 818 ttyLocker ttyl; 819 if (WizardMode) { 820 CompileTask::print(st, this, msg, /*short_form:*/ true); 821 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this)); 822 } else { 823 CompileTask::print(st, this, msg, /*short_form:*/ false); 824 } 825 } 826 } 827 828 void nmethod::maybe_print_nmethod(DirectiveSet* directive) { 829 bool printnmethods = directive->PrintAssemblyOption || directive->PrintNMethodsOption; 830 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) { 831 print_nmethod(printnmethods); 832 } 833 } 834 835 void nmethod::print_nmethod(bool printmethod) { 836 ttyLocker ttyl; // keep the following output all in one block 837 if (xtty != NULL) { 838 xtty->begin_head("print_nmethod"); 839 xtty->stamp(); 840 xtty->end_head(); 841 } 842 // print the header part first 843 print(); 844 // then print the requested information 845 if (printmethod) { 846 print_code(); 847 print_pcs(); 848 if (oop_maps()) { 849 oop_maps()->print(); 850 } 851 } 852 if (printmethod || PrintDebugInfo || CompilerOracle::has_option_string(_method, "PrintDebugInfo")) { 853 print_scopes(); 854 } 855 if (printmethod || PrintRelocations || CompilerOracle::has_option_string(_method, "PrintRelocations")) { 856 print_relocations(); 857 } 858 if (printmethod || PrintDependencies || CompilerOracle::has_option_string(_method, "PrintDependencies")) { 859 print_dependencies(); 860 } 861 if (printmethod || PrintExceptionHandlers) { 862 print_handler_table(); 863 print_nul_chk_table(); 864 } 865 if (printmethod) { 866 print_recorded_oops(); 867 print_recorded_metadata(); 868 } 869 if (xtty != NULL) { 870 xtty->tail("print_nmethod"); 871 } 872 } 873 874 875 // Promote one word from an assembly-time handle to a live embedded oop. 876 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) { 877 if (handle == NULL || 878 // As a special case, IC oops are initialized to 1 or -1. 879 handle == (jobject) Universe::non_oop_word()) { 880 (*dest) = (oop) handle; 881 } else { 882 (*dest) = JNIHandles::resolve_non_null(handle); 883 } 884 } 885 886 887 // Have to have the same name because it's called by a template 888 void nmethod::copy_values(GrowableArray<jobject>* array) { 889 int length = array->length(); 890 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough"); 891 oop* dest = oops_begin(); 892 for (int index = 0 ; index < length; index++) { 893 initialize_immediate_oop(&dest[index], array->at(index)); 894 } 895 896 // Now we can fix up all the oops in the code. We need to do this 897 // in the code because the assembler uses jobjects as placeholders. 898 // The code and relocations have already been initialized by the 899 // CodeBlob constructor, so it is valid even at this early point to 900 // iterate over relocations and patch the code. 901 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true); 902 } 903 904 void nmethod::copy_values(GrowableArray<Metadata*>* array) { 905 int length = array->length(); 906 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough"); 907 Metadata** dest = metadata_begin(); 908 for (int index = 0 ; index < length; index++) { 909 dest[index] = array->at(index); 910 } 911 } 912 913 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) { 914 // re-patch all oop-bearing instructions, just in case some oops moved 915 RelocIterator iter(this, begin, end); 916 while (iter.next()) { 917 if (iter.type() == relocInfo::oop_type) { 918 oop_Relocation* reloc = iter.oop_reloc(); 919 if (initialize_immediates && reloc->oop_is_immediate()) { 920 oop* dest = reloc->oop_addr(); 921 initialize_immediate_oop(dest, (jobject) *dest); 922 } 923 // Refresh the oop-related bits of this instruction. 924 reloc->fix_oop_relocation(); 925 } else if (iter.type() == relocInfo::metadata_type) { 926 metadata_Relocation* reloc = iter.metadata_reloc(); 927 reloc->fix_metadata_relocation(); 928 } 929 } 930 } 931 932 933 void nmethod::verify_clean_inline_caches() { 934 assert_locked_or_safepoint(CompiledIC_lock); 935 936 // If the method is not entrant or zombie then a JMP is plastered over the 937 // first few bytes. If an oop in the old code was there, that oop 938 // should not get GC'd. Skip the first few bytes of oops on 939 // not-entrant methods. 940 address low_boundary = verified_entry_point(); 941 if (!is_in_use()) { 942 low_boundary += NativeJump::instruction_size; 943 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 944 // This means that the low_boundary is going to be a little too high. 945 // This shouldn't matter, since oops of non-entrant methods are never used. 946 // In fact, why are we bothering to look at oops in a non-entrant method?? 947 } 948 949 ResourceMark rm; 950 RelocIterator iter(this, low_boundary); 951 while(iter.next()) { 952 switch(iter.type()) { 953 case relocInfo::virtual_call_type: 954 case relocInfo::opt_virtual_call_type: { 955 CompiledIC *ic = CompiledIC_at(&iter); 956 // Ok, to lookup references to zombies here 957 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination()); 958 nmethod* nm = cb->as_nmethod_or_null(); 959 if( nm != NULL ) { 960 // Verify that inline caches pointing to both zombie and not_entrant methods are clean 961 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 962 assert(ic->is_clean(), "IC should be clean"); 963 } 964 } 965 break; 966 } 967 case relocInfo::static_call_type: { 968 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc()); 969 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination()); 970 nmethod* nm = cb->as_nmethod_or_null(); 971 if( nm != NULL ) { 972 // Verify that inline caches pointing to both zombie and not_entrant methods are clean 973 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 974 assert(csc->is_clean(), "IC should be clean"); 975 } 976 } 977 break; 978 } 979 default: 980 break; 981 } 982 } 983 } 984 985 // This is a private interface with the sweeper. 986 void nmethod::mark_as_seen_on_stack() { 987 assert(is_alive(), "Must be an alive method"); 988 // Set the traversal mark to ensure that the sweeper does 2 989 // cleaning passes before moving to zombie. 990 set_stack_traversal_mark(NMethodSweeper::traversal_count()); 991 } 992 993 // Tell if a non-entrant method can be converted to a zombie (i.e., 994 // there are no activations on the stack, not in use by the VM, 995 // and not in use by the ServiceThread) 996 bool nmethod::can_convert_to_zombie() { 997 assert(is_not_entrant(), "must be a non-entrant method"); 998 999 // Since the nmethod sweeper only does partial sweep the sweeper's traversal 1000 // count can be greater than the stack traversal count before it hits the 1001 // nmethod for the second time. 1002 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count() && 1003 !is_locked_by_vm(); 1004 } 1005 1006 void nmethod::inc_decompile_count() { 1007 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return; 1008 // Could be gated by ProfileTraps, but do not bother... 1009 Method* m = method(); 1010 if (m == NULL) return; 1011 MethodData* mdo = m->method_data(); 1012 if (mdo == NULL) return; 1013 // There is a benign race here. See comments in methodData.hpp. 1014 mdo->inc_decompile_count(); 1015 } 1016 1017 void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) { 1018 1019 post_compiled_method_unload(); 1020 1021 // Since this nmethod is being unloaded, make sure that dependencies 1022 // recorded in instanceKlasses get flushed and pass non-NULL closure to 1023 // indicate that this work is being done during a GC. 1024 assert(Universe::heap()->is_gc_active(), "should only be called during gc"); 1025 assert(is_alive != NULL, "Should be non-NULL"); 1026 // A non-NULL is_alive closure indicates that this is being called during GC. 1027 flush_dependencies(is_alive); 1028 1029 // Break cycle between nmethod & method 1030 LogTarget(Trace, class, unload) lt; 1031 if (lt.is_enabled()) { 1032 LogStream ls(lt); 1033 ls.print_cr("making nmethod " INTPTR_FORMAT 1034 " unloadable, Method*(" INTPTR_FORMAT 1035 "), cause(" INTPTR_FORMAT ")", 1036 p2i(this), p2i(_method), p2i(cause)); 1037 } 1038 // Unlink the osr method, so we do not look this up again 1039 if (is_osr_method()) { 1040 // Invalidate the osr nmethod only once 1041 if (is_in_use()) { 1042 invalidate_osr_method(); 1043 } 1044 #ifdef ASSERT 1045 if (method() != NULL) { 1046 // Make sure osr nmethod is invalidated, i.e. not on the list 1047 bool found = method()->method_holder()->remove_osr_nmethod(this); 1048 assert(!found, "osr nmethod should have been invalidated"); 1049 } 1050 #endif 1051 } 1052 1053 // If _method is already NULL the Method* is about to be unloaded, 1054 // so we don't have to break the cycle. Note that it is possible to 1055 // have the Method* live here, in case we unload the nmethod because 1056 // it is pointing to some oop (other than the Method*) being unloaded. 1057 if (_method != NULL) { 1058 // OSR methods point to the Method*, but the Method* does not 1059 // point back! 1060 if (_method->code() == this) { 1061 _method->clear_code(); // Break a cycle 1062 } 1063 _method = NULL; // Clear the method of this dead nmethod 1064 } 1065 1066 // Make the class unloaded - i.e., change state and notify sweeper 1067 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); 1068 if (is_in_use()) { 1069 // Transitioning directly from live to unloaded -- so 1070 // we need to force a cache clean-up; remember this 1071 // for later on. 1072 CodeCache::set_needs_cache_clean(true); 1073 } 1074 1075 // Unregister must be done before the state change 1076 Universe::heap()->unregister_nmethod(this); 1077 1078 _state = unloaded; 1079 1080 // Log the unloading. 1081 log_state_change(); 1082 1083 #if INCLUDE_JVMCI 1084 // The method can only be unloaded after the pointer to the installed code 1085 // Java wrapper is no longer alive. Here we need to clear out this weak 1086 // reference to the dead object. 1087 maybe_invalidate_installed_code(); 1088 #endif 1089 1090 // The Method* is gone at this point 1091 assert(_method == NULL, "Tautology"); 1092 1093 set_osr_link(NULL); 1094 NMethodSweeper::report_state_change(this); 1095 } 1096 1097 void nmethod::invalidate_osr_method() { 1098 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); 1099 // Remove from list of active nmethods 1100 if (method() != NULL) { 1101 method()->method_holder()->remove_osr_nmethod(this); 1102 } 1103 } 1104 1105 void nmethod::log_state_change() const { 1106 if (LogCompilation) { 1107 if (xtty != NULL) { 1108 ttyLocker ttyl; // keep the following output all in one block 1109 if (_state == unloaded) { 1110 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'", 1111 os::current_thread_id()); 1112 } else { 1113 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s", 1114 os::current_thread_id(), 1115 (_state == zombie ? " zombie='1'" : "")); 1116 } 1117 log_identity(xtty); 1118 xtty->stamp(); 1119 xtty->end_elem(); 1120 } 1121 } 1122 1123 const char *state_msg = _state == zombie ? "made zombie" : "made not entrant"; 1124 CompileTask::print_ul(this, state_msg); 1125 if (PrintCompilation && _state != unloaded) { 1126 print_on(tty, state_msg); 1127 } 1128 } 1129 1130 /** 1131 * Common functionality for both make_not_entrant and make_zombie 1132 */ 1133 bool nmethod::make_not_entrant_or_zombie(int state) { 1134 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant"); 1135 assert(!is_zombie(), "should not already be a zombie"); 1136 1137 if (_state == state) { 1138 // Avoid taking the lock if already in required state. 1139 // This is safe from races because the state is an end-state, 1140 // which the nmethod cannot back out of once entered. 1141 // No need for fencing either. 1142 return false; 1143 } 1144 1145 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below. 1146 nmethodLocker nml(this); 1147 methodHandle the_method(method()); 1148 NoSafepointVerifier nsv; 1149 1150 // during patching, depending on the nmethod state we must notify the GC that 1151 // code has been unloaded, unregistering it. We cannot do this right while 1152 // holding the Patching_lock because we need to use the CodeCache_lock. This 1153 // would be prone to deadlocks. 1154 // This flag is used to remember whether we need to later lock and unregister. 1155 bool nmethod_needs_unregister = false; 1156 1157 { 1158 // invalidate osr nmethod before acquiring the patching lock since 1159 // they both acquire leaf locks and we don't want a deadlock. 1160 // This logic is equivalent to the logic below for patching the 1161 // verified entry point of regular methods. We check that the 1162 // nmethod is in use to ensure that it is invalidated only once. 1163 if (is_osr_method() && is_in_use()) { 1164 // this effectively makes the osr nmethod not entrant 1165 invalidate_osr_method(); 1166 } 1167 1168 // Enter critical section. Does not block for safepoint. 1169 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 1170 1171 if (_state == state) { 1172 // another thread already performed this transition so nothing 1173 // to do, but return false to indicate this. 1174 return false; 1175 } 1176 1177 // The caller can be calling the method statically or through an inline 1178 // cache call. 1179 if (!is_osr_method() && !is_not_entrant()) { 1180 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(), 1181 SharedRuntime::get_handle_wrong_method_stub()); 1182 } 1183 1184 if (is_in_use() && update_recompile_counts()) { 1185 // It's a true state change, so mark the method as decompiled. 1186 // Do it only for transition from alive. 1187 inc_decompile_count(); 1188 } 1189 1190 // If the state is becoming a zombie, signal to unregister the nmethod with 1191 // the heap. 1192 // This nmethod may have already been unloaded during a full GC. 1193 if ((state == zombie) && !is_unloaded()) { 1194 nmethod_needs_unregister = true; 1195 } 1196 1197 // Must happen before state change. Otherwise we have a race condition in 1198 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately 1199 // transition its state from 'not_entrant' to 'zombie' without having to wait 1200 // for stack scanning. 1201 if (state == not_entrant) { 1202 mark_as_seen_on_stack(); 1203 OrderAccess::storestore(); // _stack_traversal_mark and _state 1204 } 1205 1206 // Change state 1207 _state = state; 1208 1209 // Log the transition once 1210 log_state_change(); 1211 1212 // Invalidate while holding the patching lock 1213 JVMCI_ONLY(maybe_invalidate_installed_code()); 1214 1215 // Remove nmethod from method. 1216 // We need to check if both the _code and _from_compiled_code_entry_point 1217 // refer to this nmethod because there is a race in setting these two fields 1218 // in Method* as seen in bugid 4947125. 1219 // If the vep() points to the zombie nmethod, the memory for the nmethod 1220 // could be flushed and the compiler and vtable stubs could still call 1221 // through it. 1222 if (method() != NULL && (method()->code() == this || 1223 method()->from_compiled_entry() == verified_entry_point())) { 1224 HandleMark hm; 1225 method()->clear_code(false /* already owns Patching_lock */); 1226 } 1227 } // leave critical region under Patching_lock 1228 1229 #ifdef ASSERT 1230 if (is_osr_method() && method() != NULL) { 1231 // Make sure osr nmethod is invalidated, i.e. not on the list 1232 bool found = method()->method_holder()->remove_osr_nmethod(this); 1233 assert(!found, "osr nmethod should have been invalidated"); 1234 } 1235 #endif 1236 1237 // When the nmethod becomes zombie it is no longer alive so the 1238 // dependencies must be flushed. nmethods in the not_entrant 1239 // state will be flushed later when the transition to zombie 1240 // happens or they get unloaded. 1241 if (state == zombie) { 1242 { 1243 // Flushing dependencies must be done before any possible 1244 // safepoint can sneak in, otherwise the oops used by the 1245 // dependency logic could have become stale. 1246 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1247 if (nmethod_needs_unregister) { 1248 Universe::heap()->unregister_nmethod(this); 1249 } 1250 flush_dependencies(NULL); 1251 } 1252 1253 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload 1254 // event and it hasn't already been reported for this nmethod then 1255 // report it now. The event may have been reported earlier if the GC 1256 // marked it for unloading). JvmtiDeferredEventQueue support means 1257 // we no longer go to a safepoint here. 1258 post_compiled_method_unload(); 1259 1260 #ifdef ASSERT 1261 // It's no longer safe to access the oops section since zombie 1262 // nmethods aren't scanned for GC. 1263 _oops_are_stale = true; 1264 #endif 1265 // the Method may be reclaimed by class unloading now that the 1266 // nmethod is in zombie state 1267 set_method(NULL); 1268 } else { 1269 assert(state == not_entrant, "other cases may need to be handled differently"); 1270 } 1271 1272 if (TraceCreateZombies) { 1273 ResourceMark m; 1274 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"); 1275 } 1276 1277 NMethodSweeper::report_state_change(this); 1278 return true; 1279 } 1280 1281 void nmethod::flush() { 1282 // Note that there are no valid oops in the nmethod anymore. 1283 assert(!is_osr_method() || is_unloaded() || is_zombie(), 1284 "osr nmethod must be unloaded or zombie before flushing"); 1285 assert(is_zombie() || is_osr_method(), "must be a zombie method"); 1286 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed"); 1287 assert_locked_or_safepoint(CodeCache_lock); 1288 1289 // completely deallocate this method 1290 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, p2i(this)); 1291 if (PrintMethodFlushing) { 1292 tty->print_cr("*flushing %s nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT 1293 "/Free CodeCache:" SIZE_FORMAT "Kb", 1294 is_osr_method() ? "osr" : "",_compile_id, p2i(this), CodeCache::blob_count(), 1295 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024); 1296 } 1297 1298 // We need to deallocate any ExceptionCache data. 1299 // Note that we do not need to grab the nmethod lock for this, it 1300 // better be thread safe if we're disposing of it! 1301 ExceptionCache* ec = exception_cache(); 1302 set_exception_cache(NULL); 1303 while(ec != NULL) { 1304 ExceptionCache* next = ec->next(); 1305 delete ec; 1306 ec = next; 1307 } 1308 1309 if (on_scavenge_root_list()) { 1310 CodeCache::drop_scavenge_root_nmethod(this); 1311 } 1312 1313 #if INCLUDE_JVMCI 1314 assert(_jvmci_installed_code == NULL, "should have been nulled out when transitioned to zombie"); 1315 assert(_speculation_log == NULL, "should have been nulled out when transitioned to zombie"); 1316 #endif 1317 1318 CodeBlob::flush(); 1319 CodeCache::free(this); 1320 } 1321 1322 // 1323 // Notify all classes this nmethod is dependent on that it is no 1324 // longer dependent. This should only be called in two situations. 1325 // First, when a nmethod transitions to a zombie all dependents need 1326 // to be clear. Since zombification happens at a safepoint there's no 1327 // synchronization issues. The second place is a little more tricky. 1328 // During phase 1 of mark sweep class unloading may happen and as a 1329 // result some nmethods may get unloaded. In this case the flushing 1330 // of dependencies must happen during phase 1 since after GC any 1331 // dependencies in the unloaded nmethod won't be updated, so 1332 // traversing the dependency information in unsafe. In that case this 1333 // function is called with a non-NULL argument and this function only 1334 // notifies instanceKlasses that are reachable 1335 1336 void nmethod::flush_dependencies(BoolObjectClosure* is_alive) { 1337 assert_locked_or_safepoint(CodeCache_lock); 1338 assert(Universe::heap()->is_gc_active() == (is_alive != NULL), 1339 "is_alive is non-NULL if and only if we are called during GC"); 1340 if (!has_flushed_dependencies()) { 1341 set_has_flushed_dependencies(); 1342 for (Dependencies::DepStream deps(this); deps.next(); ) { 1343 if (deps.type() == Dependencies::call_site_target_value) { 1344 // CallSite dependencies are managed on per-CallSite instance basis. 1345 oop call_site = deps.argument_oop(0); 1346 MethodHandles::remove_dependent_nmethod(call_site, this); 1347 } else { 1348 Klass* klass = deps.context_type(); 1349 if (klass == NULL) { 1350 continue; // ignore things like evol_method 1351 } 1352 // During GC the is_alive closure is non-NULL, and is used to 1353 // determine liveness of dependees that need to be updated. 1354 if (is_alive == NULL || klass->is_loader_alive(is_alive)) { 1355 // The GC defers deletion of this entry, since there might be multiple threads 1356 // iterating over the _dependencies graph. Other call paths are single-threaded 1357 // and may delete it immediately. 1358 bool delete_immediately = is_alive == NULL; 1359 InstanceKlass::cast(klass)->remove_dependent_nmethod(this, delete_immediately); 1360 } 1361 } 1362 } 1363 } 1364 } 1365 1366 1367 // If this oop is not live, the nmethod can be unloaded. 1368 bool nmethod::can_unload(BoolObjectClosure* is_alive, oop* root, bool unloading_occurred) { 1369 assert(root != NULL, "just checking"); 1370 oop obj = *root; 1371 if (obj == NULL || is_alive->do_object_b(obj)) { 1372 return false; 1373 } 1374 1375 // If ScavengeRootsInCode is true, an nmethod might be unloaded 1376 // simply because one of its constant oops has gone dead. 1377 // No actual classes need to be unloaded in order for this to occur. 1378 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading"); 1379 make_unloaded(is_alive, obj); 1380 return true; 1381 } 1382 1383 // ------------------------------------------------------------------ 1384 // post_compiled_method_load_event 1385 // new method for install_code() path 1386 // Transfer information from compilation to jvmti 1387 void nmethod::post_compiled_method_load_event() { 1388 1389 Method* moop = method(); 1390 HOTSPOT_COMPILED_METHOD_LOAD( 1391 (char *) moop->klass_name()->bytes(), 1392 moop->klass_name()->utf8_length(), 1393 (char *) moop->name()->bytes(), 1394 moop->name()->utf8_length(), 1395 (char *) moop->signature()->bytes(), 1396 moop->signature()->utf8_length(), 1397 insts_begin(), insts_size()); 1398 1399 if (JvmtiExport::should_post_compiled_method_load() || 1400 JvmtiExport::should_post_compiled_method_unload()) { 1401 get_and_cache_jmethod_id(); 1402 } 1403 1404 if (JvmtiExport::should_post_compiled_method_load()) { 1405 // Let the Service thread (which is a real Java thread) post the event 1406 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); 1407 JvmtiDeferredEventQueue::enqueue( 1408 JvmtiDeferredEvent::compiled_method_load_event(this)); 1409 } 1410 } 1411 1412 jmethodID nmethod::get_and_cache_jmethod_id() { 1413 if (_jmethod_id == NULL) { 1414 // Cache the jmethod_id since it can no longer be looked up once the 1415 // method itself has been marked for unloading. 1416 _jmethod_id = method()->jmethod_id(); 1417 } 1418 return _jmethod_id; 1419 } 1420 1421 void nmethod::post_compiled_method_unload() { 1422 if (unload_reported()) { 1423 // During unloading we transition to unloaded and then to zombie 1424 // and the unloading is reported during the first transition. 1425 return; 1426 } 1427 1428 assert(_method != NULL && !is_unloaded(), "just checking"); 1429 DTRACE_METHOD_UNLOAD_PROBE(method()); 1430 1431 // If a JVMTI agent has enabled the CompiledMethodUnload event then 1432 // post the event. Sometime later this nmethod will be made a zombie 1433 // by the sweeper but the Method* will not be valid at that point. 1434 // If the _jmethod_id is null then no load event was ever requested 1435 // so don't bother posting the unload. The main reason for this is 1436 // that the jmethodID is a weak reference to the Method* so if 1437 // it's being unloaded there's no way to look it up since the weak 1438 // ref will have been cleared. 1439 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) { 1440 assert(!unload_reported(), "already unloaded"); 1441 JvmtiDeferredEvent event = 1442 JvmtiDeferredEvent::compiled_method_unload_event(this, 1443 _jmethod_id, insts_begin()); 1444 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); 1445 JvmtiDeferredEventQueue::enqueue(event); 1446 } 1447 1448 // The JVMTI CompiledMethodUnload event can be enabled or disabled at 1449 // any time. As the nmethod is being unloaded now we mark it has 1450 // having the unload event reported - this will ensure that we don't 1451 // attempt to report the event in the unlikely scenario where the 1452 // event is enabled at the time the nmethod is made a zombie. 1453 set_unload_reported(); 1454 } 1455 1456 bool nmethod::unload_if_dead_at(RelocIterator* iter_at_oop, BoolObjectClosure *is_alive, bool unloading_occurred) { 1457 assert(iter_at_oop->type() == relocInfo::oop_type, "Wrong relocation type"); 1458 1459 oop_Relocation* r = iter_at_oop->oop_reloc(); 1460 // Traverse those oops directly embedded in the code. 1461 // Other oops (oop_index>0) are seen as part of scopes_oops. 1462 assert(1 == (r->oop_is_immediate()) + 1463 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 1464 "oop must be found in exactly one place"); 1465 if (r->oop_is_immediate() && r->oop_value() != NULL) { 1466 // Unload this nmethod if the oop is dead. 1467 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) { 1468 return true;; 1469 } 1470 } 1471 1472 return false; 1473 } 1474 1475 bool nmethod::do_unloading_scopes(BoolObjectClosure* is_alive, bool unloading_occurred) { 1476 // Scopes 1477 for (oop* p = oops_begin(); p < oops_end(); p++) { 1478 if (*p == Universe::non_oop_word()) continue; // skip non-oops 1479 if (can_unload(is_alive, p, unloading_occurred)) { 1480 return true; 1481 } 1482 } 1483 return false; 1484 } 1485 1486 bool nmethod::do_unloading_oops(address low_boundary, BoolObjectClosure* is_alive, bool unloading_occurred) { 1487 // Compiled code 1488 { 1489 RelocIterator iter(this, low_boundary); 1490 while (iter.next()) { 1491 if (iter.type() == relocInfo::oop_type) { 1492 if (unload_if_dead_at(&iter, is_alive, unloading_occurred)) { 1493 return true; 1494 } 1495 } 1496 } 1497 } 1498 1499 return do_unloading_scopes(is_alive, unloading_occurred); 1500 } 1501 1502 #if INCLUDE_JVMCI 1503 bool nmethod::do_unloading_jvmci(BoolObjectClosure* is_alive, bool unloading_occurred) { 1504 if (_jvmci_installed_code != NULL) { 1505 if (JNIHandles::is_global_weak_cleared(_jvmci_installed_code)) { 1506 if (_jvmci_installed_code_triggers_unloading) { 1507 // jweak reference processing has already cleared the referent 1508 make_unloaded(is_alive, NULL); 1509 return true; 1510 } else { 1511 clear_jvmci_installed_code(); 1512 } 1513 } 1514 } 1515 return false; 1516 } 1517 #endif 1518 1519 // Iterate over metadata calling this function. Used by RedefineClasses 1520 void nmethod::metadata_do(void f(Metadata*)) { 1521 address low_boundary = verified_entry_point(); 1522 if (is_not_entrant()) { 1523 low_boundary += NativeJump::instruction_size; 1524 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1525 // (See comment above.) 1526 } 1527 { 1528 // Visit all immediate references that are embedded in the instruction stream. 1529 RelocIterator iter(this, low_boundary); 1530 while (iter.next()) { 1531 if (iter.type() == relocInfo::metadata_type ) { 1532 metadata_Relocation* r = iter.metadata_reloc(); 1533 // In this metadata, we must only follow those metadatas directly embedded in 1534 // the code. Other metadatas (oop_index>0) are seen as part of 1535 // the metadata section below. 1536 assert(1 == (r->metadata_is_immediate()) + 1537 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()), 1538 "metadata must be found in exactly one place"); 1539 if (r->metadata_is_immediate() && r->metadata_value() != NULL) { 1540 Metadata* md = r->metadata_value(); 1541 if (md != _method) f(md); 1542 } 1543 } else if (iter.type() == relocInfo::virtual_call_type) { 1544 // Check compiledIC holders associated with this nmethod 1545 CompiledIC *ic = CompiledIC_at(&iter); 1546 if (ic->is_icholder_call()) { 1547 CompiledICHolder* cichk = ic->cached_icholder(); 1548 f(cichk->holder_method()); 1549 f(cichk->holder_klass()); 1550 } else { 1551 Metadata* ic_oop = ic->cached_metadata(); 1552 if (ic_oop != NULL) { 1553 f(ic_oop); 1554 } 1555 } 1556 } 1557 } 1558 } 1559 1560 // Visit the metadata section 1561 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) { 1562 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops 1563 Metadata* md = *p; 1564 f(md); 1565 } 1566 1567 // Visit metadata not embedded in the other places. 1568 if (_method != NULL) f(_method); 1569 } 1570 1571 void nmethod::oops_do(OopClosure* f, bool allow_zombie) { 1572 // make sure the oops ready to receive visitors 1573 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod"); 1574 assert(!is_unloaded(), "should not call follow on unloaded nmethod"); 1575 1576 // If the method is not entrant or zombie then a JMP is plastered over the 1577 // first few bytes. If an oop in the old code was there, that oop 1578 // should not get GC'd. Skip the first few bytes of oops on 1579 // not-entrant methods. 1580 address low_boundary = verified_entry_point(); 1581 if (is_not_entrant()) { 1582 low_boundary += NativeJump::instruction_size; 1583 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1584 // (See comment above.) 1585 } 1586 1587 RelocIterator iter(this, low_boundary); 1588 1589 while (iter.next()) { 1590 if (iter.type() == relocInfo::oop_type ) { 1591 oop_Relocation* r = iter.oop_reloc(); 1592 // In this loop, we must only follow those oops directly embedded in 1593 // the code. Other oops (oop_index>0) are seen as part of scopes_oops. 1594 assert(1 == (r->oop_is_immediate()) + 1595 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 1596 "oop must be found in exactly one place"); 1597 if (r->oop_is_immediate() && r->oop_value() != NULL) { 1598 f->do_oop(r->oop_addr()); 1599 } 1600 } 1601 } 1602 1603 // Scopes 1604 // This includes oop constants not inlined in the code stream. 1605 for (oop* p = oops_begin(); p < oops_end(); p++) { 1606 if (*p == Universe::non_oop_word()) continue; // skip non-oops 1607 f->do_oop(p); 1608 } 1609 } 1610 1611 #define NMETHOD_SENTINEL ((nmethod*)badAddress) 1612 1613 nmethod* volatile nmethod::_oops_do_mark_nmethods; 1614 1615 // An nmethod is "marked" if its _mark_link is set non-null. 1616 // Even if it is the end of the linked list, it will have a non-null link value, 1617 // as long as it is on the list. 1618 // This code must be MP safe, because it is used from parallel GC passes. 1619 bool nmethod::test_set_oops_do_mark() { 1620 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called"); 1621 if (_oops_do_mark_link == NULL) { 1622 // Claim this nmethod for this thread to mark. 1623 if (Atomic::cmpxchg(NMETHOD_SENTINEL, &_oops_do_mark_link, (nmethod*)NULL) == NULL) { 1624 // Atomically append this nmethod (now claimed) to the head of the list: 1625 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods; 1626 for (;;) { 1627 nmethod* required_mark_nmethods = observed_mark_nmethods; 1628 _oops_do_mark_link = required_mark_nmethods; 1629 observed_mark_nmethods = 1630 Atomic::cmpxchg(this, &_oops_do_mark_nmethods, required_mark_nmethods); 1631 if (observed_mark_nmethods == required_mark_nmethods) 1632 break; 1633 } 1634 // Mark was clear when we first saw this guy. 1635 if (TraceScavenge) { print_on(tty, "oops_do, mark"); } 1636 return false; 1637 } 1638 } 1639 // On fall through, another racing thread marked this nmethod before we did. 1640 return true; 1641 } 1642 1643 void nmethod::oops_do_marking_prologue() { 1644 if (TraceScavenge) { tty->print_cr("[oops_do_marking_prologue"); } 1645 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row"); 1646 // We use cmpxchg instead of regular assignment here because the user 1647 // may fork a bunch of threads, and we need them all to see the same state. 1648 nmethod* observed = Atomic::cmpxchg(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, (nmethod*)NULL); 1649 guarantee(observed == NULL, "no races in this sequential code"); 1650 } 1651 1652 void nmethod::oops_do_marking_epilogue() { 1653 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row"); 1654 nmethod* cur = _oops_do_mark_nmethods; 1655 while (cur != NMETHOD_SENTINEL) { 1656 assert(cur != NULL, "not NULL-terminated"); 1657 nmethod* next = cur->_oops_do_mark_link; 1658 cur->_oops_do_mark_link = NULL; 1659 DEBUG_ONLY(cur->verify_oop_relocations()); 1660 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark")); 1661 cur = next; 1662 } 1663 nmethod* required = _oops_do_mark_nmethods; 1664 nmethod* observed = Atomic::cmpxchg((nmethod*)NULL, &_oops_do_mark_nmethods, required); 1665 guarantee(observed == required, "no races in this sequential code"); 1666 if (TraceScavenge) { tty->print_cr("oops_do_marking_epilogue]"); } 1667 } 1668 1669 class DetectScavengeRoot: public OopClosure { 1670 bool _detected_scavenge_root; 1671 public: 1672 DetectScavengeRoot() : _detected_scavenge_root(false) 1673 { NOT_PRODUCT(_print_nm = NULL); } 1674 bool detected_scavenge_root() { return _detected_scavenge_root; } 1675 virtual void do_oop(oop* p) { 1676 if ((*p) != NULL && (*p)->is_scavengable()) { 1677 NOT_PRODUCT(maybe_print(p)); 1678 _detected_scavenge_root = true; 1679 } 1680 } 1681 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 1682 1683 #ifndef PRODUCT 1684 nmethod* _print_nm; 1685 void maybe_print(oop* p) { 1686 if (_print_nm == NULL) return; 1687 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root"); 1688 tty->print_cr("" PTR_FORMAT "[offset=%d] detected scavengable oop " PTR_FORMAT " (found at " PTR_FORMAT ")", 1689 p2i(_print_nm), (int)((intptr_t)p - (intptr_t)_print_nm), 1690 p2i(*p), p2i(p)); 1691 (*p)->print(); 1692 } 1693 #endif //PRODUCT 1694 }; 1695 1696 bool nmethod::detect_scavenge_root_oops() { 1697 DetectScavengeRoot detect_scavenge_root; 1698 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this); 1699 oops_do(&detect_scavenge_root); 1700 return detect_scavenge_root.detected_scavenge_root(); 1701 } 1702 1703 inline bool includes(void* p, void* from, void* to) { 1704 return from <= p && p < to; 1705 } 1706 1707 1708 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) { 1709 assert(count >= 2, "must be sentinel values, at least"); 1710 1711 #ifdef ASSERT 1712 // must be sorted and unique; we do a binary search in find_pc_desc() 1713 int prev_offset = pcs[0].pc_offset(); 1714 assert(prev_offset == PcDesc::lower_offset_limit, 1715 "must start with a sentinel"); 1716 for (int i = 1; i < count; i++) { 1717 int this_offset = pcs[i].pc_offset(); 1718 assert(this_offset > prev_offset, "offsets must be sorted"); 1719 prev_offset = this_offset; 1720 } 1721 assert(prev_offset == PcDesc::upper_offset_limit, 1722 "must end with a sentinel"); 1723 #endif //ASSERT 1724 1725 // Search for MethodHandle invokes and tag the nmethod. 1726 for (int i = 0; i < count; i++) { 1727 if (pcs[i].is_method_handle_invoke()) { 1728 set_has_method_handle_invokes(true); 1729 break; 1730 } 1731 } 1732 assert(has_method_handle_invokes() == (_deopt_mh_handler_begin != NULL), "must have deopt mh handler"); 1733 1734 int size = count * sizeof(PcDesc); 1735 assert(scopes_pcs_size() >= size, "oob"); 1736 memcpy(scopes_pcs_begin(), pcs, size); 1737 1738 // Adjust the final sentinel downward. 1739 PcDesc* last_pc = &scopes_pcs_begin()[count-1]; 1740 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity"); 1741 last_pc->set_pc_offset(content_size() + 1); 1742 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) { 1743 // Fill any rounding gaps with copies of the last record. 1744 last_pc[1] = last_pc[0]; 1745 } 1746 // The following assert could fail if sizeof(PcDesc) is not 1747 // an integral multiple of oopSize (the rounding term). 1748 // If it fails, change the logic to always allocate a multiple 1749 // of sizeof(PcDesc), and fill unused words with copies of *last_pc. 1750 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly"); 1751 } 1752 1753 void nmethod::copy_scopes_data(u_char* buffer, int size) { 1754 assert(scopes_data_size() >= size, "oob"); 1755 memcpy(scopes_data_begin(), buffer, size); 1756 } 1757 1758 #ifdef ASSERT 1759 static PcDesc* linear_search(const PcDescSearch& search, int pc_offset, bool approximate) { 1760 PcDesc* lower = search.scopes_pcs_begin(); 1761 PcDesc* upper = search.scopes_pcs_end(); 1762 lower += 1; // exclude initial sentinel 1763 PcDesc* res = NULL; 1764 for (PcDesc* p = lower; p < upper; p++) { 1765 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc 1766 if (match_desc(p, pc_offset, approximate)) { 1767 if (res == NULL) 1768 res = p; 1769 else 1770 res = (PcDesc*) badAddress; 1771 } 1772 } 1773 return res; 1774 } 1775 #endif 1776 1777 1778 // Finds a PcDesc with real-pc equal to "pc" 1779 PcDesc* PcDescContainer::find_pc_desc_internal(address pc, bool approximate, const PcDescSearch& search) { 1780 address base_address = search.code_begin(); 1781 if ((pc < base_address) || 1782 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) { 1783 return NULL; // PC is wildly out of range 1784 } 1785 int pc_offset = (int) (pc - base_address); 1786 1787 // Check the PcDesc cache if it contains the desired PcDesc 1788 // (This as an almost 100% hit rate.) 1789 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate); 1790 if (res != NULL) { 1791 assert(res == linear_search(search, pc_offset, approximate), "cache ok"); 1792 return res; 1793 } 1794 1795 // Fallback algorithm: quasi-linear search for the PcDesc 1796 // Find the last pc_offset less than the given offset. 1797 // The successor must be the required match, if there is a match at all. 1798 // (Use a fixed radix to avoid expensive affine pointer arithmetic.) 1799 PcDesc* lower = search.scopes_pcs_begin(); 1800 PcDesc* upper = search.scopes_pcs_end(); 1801 upper -= 1; // exclude final sentinel 1802 if (lower >= upper) return NULL; // native method; no PcDescs at all 1803 1804 #define assert_LU_OK \ 1805 /* invariant on lower..upper during the following search: */ \ 1806 assert(lower->pc_offset() < pc_offset, "sanity"); \ 1807 assert(upper->pc_offset() >= pc_offset, "sanity") 1808 assert_LU_OK; 1809 1810 // Use the last successful return as a split point. 1811 PcDesc* mid = _pc_desc_cache.last_pc_desc(); 1812 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 1813 if (mid->pc_offset() < pc_offset) { 1814 lower = mid; 1815 } else { 1816 upper = mid; 1817 } 1818 1819 // Take giant steps at first (4096, then 256, then 16, then 1) 1820 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1); 1821 const int RADIX = (1 << LOG2_RADIX); 1822 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) { 1823 while ((mid = lower + step) < upper) { 1824 assert_LU_OK; 1825 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 1826 if (mid->pc_offset() < pc_offset) { 1827 lower = mid; 1828 } else { 1829 upper = mid; 1830 break; 1831 } 1832 } 1833 assert_LU_OK; 1834 } 1835 1836 // Sneak up on the value with a linear search of length ~16. 1837 while (true) { 1838 assert_LU_OK; 1839 mid = lower + 1; 1840 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 1841 if (mid->pc_offset() < pc_offset) { 1842 lower = mid; 1843 } else { 1844 upper = mid; 1845 break; 1846 } 1847 } 1848 #undef assert_LU_OK 1849 1850 if (match_desc(upper, pc_offset, approximate)) { 1851 assert(upper == linear_search(search, pc_offset, approximate), "search ok"); 1852 _pc_desc_cache.add_pc_desc(upper); 1853 return upper; 1854 } else { 1855 assert(NULL == linear_search(search, pc_offset, approximate), "search ok"); 1856 return NULL; 1857 } 1858 } 1859 1860 1861 void nmethod::check_all_dependencies(DepChange& changes) { 1862 // Checked dependencies are allocated into this ResourceMark 1863 ResourceMark rm; 1864 1865 // Turn off dependency tracing while actually testing dependencies. 1866 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) ); 1867 1868 typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash, 1869 &DependencySignature::equals, 11027> DepTable; 1870 1871 DepTable* table = new DepTable(); 1872 1873 // Iterate over live nmethods and check dependencies of all nmethods that are not 1874 // marked for deoptimization. A particular dependency is only checked once. 1875 NMethodIterator iter; 1876 while(iter.next()) { 1877 nmethod* nm = iter.method(); 1878 // Only notify for live nmethods 1879 if (nm->is_alive() && !nm->is_marked_for_deoptimization()) { 1880 for (Dependencies::DepStream deps(nm); deps.next(); ) { 1881 // Construct abstraction of a dependency. 1882 DependencySignature* current_sig = new DependencySignature(deps); 1883 1884 // Determine if dependency is already checked. table->put(...) returns 1885 // 'true' if the dependency is added (i.e., was not in the hashtable). 1886 if (table->put(*current_sig, 1)) { 1887 if (deps.check_dependency() != NULL) { 1888 // Dependency checking failed. Print out information about the failed 1889 // dependency and finally fail with an assert. We can fail here, since 1890 // dependency checking is never done in a product build. 1891 tty->print_cr("Failed dependency:"); 1892 changes.print(); 1893 nm->print(); 1894 nm->print_dependencies(); 1895 assert(false, "Should have been marked for deoptimization"); 1896 } 1897 } 1898 } 1899 } 1900 } 1901 } 1902 1903 bool nmethod::check_dependency_on(DepChange& changes) { 1904 // What has happened: 1905 // 1) a new class dependee has been added 1906 // 2) dependee and all its super classes have been marked 1907 bool found_check = false; // set true if we are upset 1908 for (Dependencies::DepStream deps(this); deps.next(); ) { 1909 // Evaluate only relevant dependencies. 1910 if (deps.spot_check_dependency_at(changes) != NULL) { 1911 found_check = true; 1912 NOT_DEBUG(break); 1913 } 1914 } 1915 return found_check; 1916 } 1917 1918 bool nmethod::is_evol_dependent_on(Klass* dependee) { 1919 InstanceKlass *dependee_ik = InstanceKlass::cast(dependee); 1920 Array<Method*>* dependee_methods = dependee_ik->methods(); 1921 for (Dependencies::DepStream deps(this); deps.next(); ) { 1922 if (deps.type() == Dependencies::evol_method) { 1923 Method* method = deps.method_argument(0); 1924 for (int j = 0; j < dependee_methods->length(); j++) { 1925 if (dependee_methods->at(j) == method) { 1926 if (log_is_enabled(Debug, redefine, class, nmethod)) { 1927 ResourceMark rm; 1928 log_debug(redefine, class, nmethod) 1929 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)", 1930 _method->method_holder()->external_name(), 1931 _method->name()->as_C_string(), 1932 _method->signature()->as_C_string(), 1933 compile_id(), 1934 method->method_holder()->external_name(), 1935 method->name()->as_C_string(), 1936 method->signature()->as_C_string()); 1937 } 1938 if (TraceDependencies || LogCompilation) 1939 deps.log_dependency(dependee); 1940 return true; 1941 } 1942 } 1943 } 1944 } 1945 return false; 1946 } 1947 1948 // Called from mark_for_deoptimization, when dependee is invalidated. 1949 bool nmethod::is_dependent_on_method(Method* dependee) { 1950 for (Dependencies::DepStream deps(this); deps.next(); ) { 1951 if (deps.type() != Dependencies::evol_method) 1952 continue; 1953 Method* method = deps.method_argument(0); 1954 if (method == dependee) return true; 1955 } 1956 return false; 1957 } 1958 1959 1960 bool nmethod::is_patchable_at(address instr_addr) { 1961 assert(insts_contains(instr_addr), "wrong nmethod used"); 1962 if (is_zombie()) { 1963 // a zombie may never be patched 1964 return false; 1965 } 1966 return true; 1967 } 1968 1969 1970 address nmethod::continuation_for_implicit_exception(address pc) { 1971 // Exception happened outside inline-cache check code => we are inside 1972 // an active nmethod => use cpc to determine a return address 1973 int exception_offset = pc - code_begin(); 1974 int cont_offset = ImplicitExceptionTable(this).at( exception_offset ); 1975 #ifdef ASSERT 1976 if (cont_offset == 0) { 1977 Thread* thread = Thread::current(); 1978 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY 1979 HandleMark hm(thread); 1980 ResourceMark rm(thread); 1981 CodeBlob* cb = CodeCache::find_blob(pc); 1982 assert(cb != NULL && cb == this, ""); 1983 ttyLocker ttyl; 1984 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, p2i(pc)); 1985 print(); 1986 method()->print_codes(); 1987 print_code(); 1988 print_pcs(); 1989 } 1990 #endif 1991 if (cont_offset == 0) { 1992 // Let the normal error handling report the exception 1993 return NULL; 1994 } 1995 return code_begin() + cont_offset; 1996 } 1997 1998 1999 2000 void nmethod_init() { 2001 // make sure you didn't forget to adjust the filler fields 2002 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word"); 2003 } 2004 2005 2006 //------------------------------------------------------------------------------------------- 2007 2008 2009 // QQQ might we make this work from a frame?? 2010 nmethodLocker::nmethodLocker(address pc) { 2011 CodeBlob* cb = CodeCache::find_blob(pc); 2012 guarantee(cb != NULL && cb->is_compiled(), "bad pc for a nmethod found"); 2013 _nm = cb->as_compiled_method(); 2014 lock_nmethod(_nm); 2015 } 2016 2017 // Only JvmtiDeferredEvent::compiled_method_unload_event() 2018 // should pass zombie_ok == true. 2019 void nmethodLocker::lock_nmethod(CompiledMethod* cm, bool zombie_ok) { 2020 if (cm == NULL) return; 2021 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method 2022 nmethod* nm = cm->as_nmethod(); 2023 Atomic::inc(&nm->_lock_count); 2024 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method"); 2025 } 2026 2027 void nmethodLocker::unlock_nmethod(CompiledMethod* cm) { 2028 if (cm == NULL) return; 2029 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method 2030 nmethod* nm = cm->as_nmethod(); 2031 Atomic::dec(&nm->_lock_count); 2032 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock"); 2033 } 2034 2035 2036 // ----------------------------------------------------------------------------- 2037 // Verification 2038 2039 class VerifyOopsClosure: public OopClosure { 2040 nmethod* _nm; 2041 bool _ok; 2042 public: 2043 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { } 2044 bool ok() { return _ok; } 2045 virtual void do_oop(oop* p) { 2046 if (oopDesc::is_oop_or_null(*p)) return; 2047 if (_ok) { 2048 _nm->print_nmethod(true); 2049 _ok = false; 2050 } 2051 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)", 2052 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm)); 2053 } 2054 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2055 }; 2056 2057 void nmethod::verify() { 2058 2059 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant 2060 // seems odd. 2061 2062 if (is_zombie() || is_not_entrant() || is_unloaded()) 2063 return; 2064 2065 // Make sure all the entry points are correctly aligned for patching. 2066 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point()); 2067 2068 // assert(oopDesc::is_oop(method()), "must be valid"); 2069 2070 ResourceMark rm; 2071 2072 if (!CodeCache::contains(this)) { 2073 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this)); 2074 } 2075 2076 if(is_native_method() ) 2077 return; 2078 2079 nmethod* nm = CodeCache::find_nmethod(verified_entry_point()); 2080 if (nm != this) { 2081 fatal("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this)); 2082 } 2083 2084 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2085 if (! p->verify(this)) { 2086 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this)); 2087 } 2088 } 2089 2090 VerifyOopsClosure voc(this); 2091 oops_do(&voc); 2092 assert(voc.ok(), "embedded oops must be OK"); 2093 Universe::heap()->verify_nmethod(this); 2094 2095 verify_scopes(); 2096 } 2097 2098 2099 void nmethod::verify_interrupt_point(address call_site) { 2100 // Verify IC only when nmethod installation is finished. 2101 if (!is_not_installed()) { 2102 Thread *cur = Thread::current(); 2103 if (CompiledIC_lock->owner() == cur || 2104 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) && 2105 SafepointSynchronize::is_at_safepoint())) { 2106 CompiledIC_at(this, call_site); 2107 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); 2108 } else { 2109 MutexLocker ml_verify (CompiledIC_lock); 2110 CompiledIC_at(this, call_site); 2111 } 2112 } 2113 2114 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address()); 2115 assert(pd != NULL, "PcDesc must exist"); 2116 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(), 2117 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(), 2118 pd->return_oop()); 2119 !sd->is_top(); sd = sd->sender()) { 2120 sd->verify(); 2121 } 2122 } 2123 2124 void nmethod::verify_scopes() { 2125 if( !method() ) return; // Runtime stubs have no scope 2126 if (method()->is_native()) return; // Ignore stub methods. 2127 // iterate through all interrupt point 2128 // and verify the debug information is valid. 2129 RelocIterator iter((nmethod*)this); 2130 while (iter.next()) { 2131 address stub = NULL; 2132 switch (iter.type()) { 2133 case relocInfo::virtual_call_type: 2134 verify_interrupt_point(iter.addr()); 2135 break; 2136 case relocInfo::opt_virtual_call_type: 2137 stub = iter.opt_virtual_call_reloc()->static_stub(false); 2138 verify_interrupt_point(iter.addr()); 2139 break; 2140 case relocInfo::static_call_type: 2141 stub = iter.static_call_reloc()->static_stub(false); 2142 //verify_interrupt_point(iter.addr()); 2143 break; 2144 case relocInfo::runtime_call_type: 2145 case relocInfo::runtime_call_w_cp_type: { 2146 address destination = iter.reloc()->value(); 2147 // Right now there is no way to find out which entries support 2148 // an interrupt point. It would be nice if we had this 2149 // information in a table. 2150 break; 2151 } 2152 default: 2153 break; 2154 } 2155 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section"); 2156 } 2157 } 2158 2159 2160 // ----------------------------------------------------------------------------- 2161 // Non-product code 2162 #ifndef PRODUCT 2163 2164 class DebugScavengeRoot: public OopClosure { 2165 nmethod* _nm; 2166 bool _ok; 2167 public: 2168 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { } 2169 bool ok() { return _ok; } 2170 virtual void do_oop(oop* p) { 2171 if ((*p) == NULL || !(*p)->is_scavengable()) return; 2172 if (_ok) { 2173 _nm->print_nmethod(true); 2174 _ok = false; 2175 } 2176 tty->print_cr("*** scavengable oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)", 2177 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm)); 2178 (*p)->print(); 2179 } 2180 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2181 }; 2182 2183 void nmethod::verify_scavenge_root_oops() { 2184 if (!on_scavenge_root_list()) { 2185 // Actually look inside, to verify the claim that it's clean. 2186 DebugScavengeRoot debug_scavenge_root(this); 2187 oops_do(&debug_scavenge_root); 2188 if (!debug_scavenge_root.ok()) 2189 fatal("found an unadvertised bad scavengable oop in the code cache"); 2190 } 2191 assert(scavenge_root_not_marked(), ""); 2192 } 2193 2194 #endif // PRODUCT 2195 2196 // Printing operations 2197 2198 void nmethod::print() const { 2199 ResourceMark rm; 2200 ttyLocker ttyl; // keep the following output all in one block 2201 2202 tty->print("Compiled method "); 2203 2204 if (is_compiled_by_c1()) { 2205 tty->print("(c1) "); 2206 } else if (is_compiled_by_c2()) { 2207 tty->print("(c2) "); 2208 } else if (is_compiled_by_jvmci()) { 2209 tty->print("(JVMCI) "); 2210 } else { 2211 tty->print("(nm) "); 2212 } 2213 2214 print_on(tty, NULL); 2215 2216 if (WizardMode) { 2217 tty->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this)); 2218 tty->print(" for method " INTPTR_FORMAT , p2i(method())); 2219 tty->print(" { "); 2220 tty->print_cr("%s ", state()); 2221 if (on_scavenge_root_list()) tty->print("scavenge_root "); 2222 tty->print_cr("}:"); 2223 } 2224 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2225 p2i(this), 2226 p2i(this) + size(), 2227 size()); 2228 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2229 p2i(relocation_begin()), 2230 p2i(relocation_end()), 2231 relocation_size()); 2232 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2233 p2i(consts_begin()), 2234 p2i(consts_end()), 2235 consts_size()); 2236 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2237 p2i(insts_begin()), 2238 p2i(insts_end()), 2239 insts_size()); 2240 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2241 p2i(stub_begin()), 2242 p2i(stub_end()), 2243 stub_size()); 2244 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2245 p2i(oops_begin()), 2246 p2i(oops_end()), 2247 oops_size()); 2248 if (metadata_size () > 0) tty->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2249 p2i(metadata_begin()), 2250 p2i(metadata_end()), 2251 metadata_size()); 2252 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2253 p2i(scopes_data_begin()), 2254 p2i(scopes_data_end()), 2255 scopes_data_size()); 2256 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2257 p2i(scopes_pcs_begin()), 2258 p2i(scopes_pcs_end()), 2259 scopes_pcs_size()); 2260 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2261 p2i(dependencies_begin()), 2262 p2i(dependencies_end()), 2263 dependencies_size()); 2264 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2265 p2i(handler_table_begin()), 2266 p2i(handler_table_end()), 2267 handler_table_size()); 2268 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2269 p2i(nul_chk_table_begin()), 2270 p2i(nul_chk_table_end()), 2271 nul_chk_table_size()); 2272 } 2273 2274 #ifndef PRODUCT 2275 2276 void nmethod::print_scopes() { 2277 // Find the first pc desc for all scopes in the code and print it. 2278 ResourceMark rm; 2279 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2280 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null) 2281 continue; 2282 2283 ScopeDesc* sd = scope_desc_at(p->real_pc(this)); 2284 while (sd != NULL) { 2285 sd->print_on(tty, p); 2286 sd = sd->sender(); 2287 } 2288 } 2289 } 2290 2291 void nmethod::print_dependencies() { 2292 ResourceMark rm; 2293 ttyLocker ttyl; // keep the following output all in one block 2294 tty->print_cr("Dependencies:"); 2295 for (Dependencies::DepStream deps(this); deps.next(); ) { 2296 deps.print_dependency(); 2297 Klass* ctxk = deps.context_type(); 2298 if (ctxk != NULL) { 2299 if (ctxk->is_instance_klass() && InstanceKlass::cast(ctxk)->is_dependent_nmethod(this)) { 2300 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name()); 2301 } 2302 } 2303 deps.log_dependency(); // put it into the xml log also 2304 } 2305 } 2306 2307 2308 void nmethod::print_relocations() { 2309 ResourceMark m; // in case methods get printed via the debugger 2310 tty->print_cr("relocations:"); 2311 RelocIterator iter(this); 2312 iter.print(); 2313 } 2314 2315 2316 void nmethod::print_pcs() { 2317 ResourceMark m; // in case methods get printed via debugger 2318 tty->print_cr("pc-bytecode offsets:"); 2319 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2320 p->print(this); 2321 } 2322 } 2323 2324 void nmethod::print_recorded_oops() { 2325 tty->print_cr("Recorded oops:"); 2326 for (int i = 0; i < oops_count(); i++) { 2327 oop o = oop_at(i); 2328 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(o)); 2329 if (o == (oop)Universe::non_oop_word()) { 2330 tty->print("non-oop word"); 2331 } else { 2332 o->print_value(); 2333 } 2334 tty->cr(); 2335 } 2336 } 2337 2338 void nmethod::print_recorded_metadata() { 2339 tty->print_cr("Recorded metadata:"); 2340 for (int i = 0; i < metadata_count(); i++) { 2341 Metadata* m = metadata_at(i); 2342 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(m)); 2343 if (m == (Metadata*)Universe::non_oop_word()) { 2344 tty->print("non-metadata word"); 2345 } else { 2346 m->print_value_on_maybe_null(tty); 2347 } 2348 tty->cr(); 2349 } 2350 } 2351 2352 #endif // PRODUCT 2353 2354 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) { 2355 RelocIterator iter(this, begin, end); 2356 bool have_one = false; 2357 while (iter.next()) { 2358 have_one = true; 2359 switch (iter.type()) { 2360 case relocInfo::none: return "no_reloc"; 2361 case relocInfo::oop_type: { 2362 stringStream st; 2363 oop_Relocation* r = iter.oop_reloc(); 2364 oop obj = r->oop_value(); 2365 st.print("oop("); 2366 if (obj == NULL) st.print("NULL"); 2367 else obj->print_value_on(&st); 2368 st.print(")"); 2369 return st.as_string(); 2370 } 2371 case relocInfo::metadata_type: { 2372 stringStream st; 2373 metadata_Relocation* r = iter.metadata_reloc(); 2374 Metadata* obj = r->metadata_value(); 2375 st.print("metadata("); 2376 if (obj == NULL) st.print("NULL"); 2377 else obj->print_value_on(&st); 2378 st.print(")"); 2379 return st.as_string(); 2380 } 2381 case relocInfo::runtime_call_type: 2382 case relocInfo::runtime_call_w_cp_type: { 2383 stringStream st; 2384 st.print("runtime_call"); 2385 CallRelocation* r = (CallRelocation*)iter.reloc(); 2386 address dest = r->destination(); 2387 CodeBlob* cb = CodeCache::find_blob(dest); 2388 if (cb != NULL) { 2389 st.print(" %s", cb->name()); 2390 } else { 2391 ResourceMark rm; 2392 const int buflen = 1024; 2393 char* buf = NEW_RESOURCE_ARRAY(char, buflen); 2394 int offset; 2395 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) { 2396 st.print(" %s", buf); 2397 if (offset != 0) { 2398 st.print("+%d", offset); 2399 } 2400 } 2401 } 2402 return st.as_string(); 2403 } 2404 case relocInfo::virtual_call_type: { 2405 stringStream st; 2406 st.print_raw("virtual_call"); 2407 virtual_call_Relocation* r = iter.virtual_call_reloc(); 2408 Method* m = r->method_value(); 2409 if (m != NULL) { 2410 assert(m->is_method(), ""); 2411 m->print_short_name(&st); 2412 } 2413 return st.as_string(); 2414 } 2415 case relocInfo::opt_virtual_call_type: { 2416 stringStream st; 2417 st.print_raw("optimized virtual_call"); 2418 opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc(); 2419 Method* m = r->method_value(); 2420 if (m != NULL) { 2421 assert(m->is_method(), ""); 2422 m->print_short_name(&st); 2423 } 2424 return st.as_string(); 2425 } 2426 case relocInfo::static_call_type: { 2427 stringStream st; 2428 st.print_raw("static_call"); 2429 static_call_Relocation* r = iter.static_call_reloc(); 2430 Method* m = r->method_value(); 2431 if (m != NULL) { 2432 assert(m->is_method(), ""); 2433 m->print_short_name(&st); 2434 } 2435 return st.as_string(); 2436 } 2437 case relocInfo::static_stub_type: return "static_stub"; 2438 case relocInfo::external_word_type: return "external_word"; 2439 case relocInfo::internal_word_type: return "internal_word"; 2440 case relocInfo::section_word_type: return "section_word"; 2441 case relocInfo::poll_type: return "poll"; 2442 case relocInfo::poll_return_type: return "poll_return"; 2443 case relocInfo::type_mask: return "type_bit_mask"; 2444 2445 default: 2446 break; 2447 } 2448 } 2449 return have_one ? "other" : NULL; 2450 } 2451 2452 // Return a the last scope in (begin..end] 2453 ScopeDesc* nmethod::scope_desc_in(address begin, address end) { 2454 PcDesc* p = pc_desc_near(begin+1); 2455 if (p != NULL && p->real_pc(this) <= end) { 2456 return new ScopeDesc(this, p->scope_decode_offset(), 2457 p->obj_decode_offset(), p->should_reexecute(), p->rethrow_exception(), 2458 p->return_oop()); 2459 } 2460 return NULL; 2461 } 2462 2463 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const { 2464 if (block_begin == entry_point()) stream->print_cr("[Entry Point]"); 2465 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]"); 2466 if (JVMCI_ONLY(_exception_offset >= 0 &&) block_begin == exception_begin()) stream->print_cr("[Exception Handler]"); 2467 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]"); 2468 if (JVMCI_ONLY(_deopt_handler_begin != NULL &&) block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]"); 2469 2470 if (has_method_handle_invokes()) 2471 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]"); 2472 2473 if (block_begin == consts_begin()) stream->print_cr("[Constants]"); 2474 2475 if (block_begin == entry_point()) { 2476 methodHandle m = method(); 2477 if (m.not_null()) { 2478 stream->print(" # "); 2479 m->print_value_on(stream); 2480 stream->cr(); 2481 } 2482 if (m.not_null() && !is_osr_method()) { 2483 ResourceMark rm; 2484 int sizeargs = m->size_of_parameters(); 2485 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs); 2486 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs); 2487 { 2488 int sig_index = 0; 2489 if (!m->is_static()) 2490 sig_bt[sig_index++] = T_OBJECT; // 'this' 2491 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) { 2492 BasicType t = ss.type(); 2493 sig_bt[sig_index++] = t; 2494 if (type2size[t] == 2) { 2495 sig_bt[sig_index++] = T_VOID; 2496 } else { 2497 assert(type2size[t] == 1, "size is 1 or 2"); 2498 } 2499 } 2500 assert(sig_index == sizeargs, ""); 2501 } 2502 const char* spname = "sp"; // make arch-specific? 2503 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false); 2504 int stack_slot_offset = this->frame_size() * wordSize; 2505 int tab1 = 14, tab2 = 24; 2506 int sig_index = 0; 2507 int arg_index = (m->is_static() ? 0 : -1); 2508 bool did_old_sp = false; 2509 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) { 2510 bool at_this = (arg_index == -1); 2511 bool at_old_sp = false; 2512 BasicType t = (at_this ? T_OBJECT : ss.type()); 2513 assert(t == sig_bt[sig_index], "sigs in sync"); 2514 if (at_this) 2515 stream->print(" # this: "); 2516 else 2517 stream->print(" # parm%d: ", arg_index); 2518 stream->move_to(tab1); 2519 VMReg fst = regs[sig_index].first(); 2520 VMReg snd = regs[sig_index].second(); 2521 if (fst->is_reg()) { 2522 stream->print("%s", fst->name()); 2523 if (snd->is_valid()) { 2524 stream->print(":%s", snd->name()); 2525 } 2526 } else if (fst->is_stack()) { 2527 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset; 2528 if (offset == stack_slot_offset) at_old_sp = true; 2529 stream->print("[%s+0x%x]", spname, offset); 2530 } else { 2531 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd); 2532 } 2533 stream->print(" "); 2534 stream->move_to(tab2); 2535 stream->print("= "); 2536 if (at_this) { 2537 m->method_holder()->print_value_on(stream); 2538 } else { 2539 bool did_name = false; 2540 if (!at_this && ss.is_object()) { 2541 Symbol* name = ss.as_symbol_or_null(); 2542 if (name != NULL) { 2543 name->print_value_on(stream); 2544 did_name = true; 2545 } 2546 } 2547 if (!did_name) 2548 stream->print("%s", type2name(t)); 2549 } 2550 if (at_old_sp) { 2551 stream->print(" (%s of caller)", spname); 2552 did_old_sp = true; 2553 } 2554 stream->cr(); 2555 sig_index += type2size[t]; 2556 arg_index += 1; 2557 if (!at_this) ss.next(); 2558 } 2559 if (!did_old_sp) { 2560 stream->print(" # "); 2561 stream->move_to(tab1); 2562 stream->print("[%s+0x%x]", spname, stack_slot_offset); 2563 stream->print(" (%s of caller)", spname); 2564 stream->cr(); 2565 } 2566 } 2567 } 2568 } 2569 2570 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) { 2571 // First, find an oopmap in (begin, end]. 2572 // We use the odd half-closed interval so that oop maps and scope descs 2573 // which are tied to the byte after a call are printed with the call itself. 2574 address base = code_begin(); 2575 ImmutableOopMapSet* oms = oop_maps(); 2576 if (oms != NULL) { 2577 for (int i = 0, imax = oms->count(); i < imax; i++) { 2578 const ImmutableOopMapPair* pair = oms->pair_at(i); 2579 const ImmutableOopMap* om = pair->get_from(oms); 2580 address pc = base + pair->pc_offset(); 2581 if (pc > begin) { 2582 if (pc <= end) { 2583 st->move_to(column); 2584 st->print("; "); 2585 om->print_on(st); 2586 } 2587 break; 2588 } 2589 } 2590 } 2591 2592 // Print any debug info present at this pc. 2593 ScopeDesc* sd = scope_desc_in(begin, end); 2594 if (sd != NULL) { 2595 st->move_to(column); 2596 if (sd->bci() == SynchronizationEntryBCI) { 2597 st->print(";*synchronization entry"); 2598 } else { 2599 if (sd->method() == NULL) { 2600 st->print("method is NULL"); 2601 } else if (sd->method()->is_native()) { 2602 st->print("method is native"); 2603 } else { 2604 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci()); 2605 st->print(";*%s", Bytecodes::name(bc)); 2606 switch (bc) { 2607 case Bytecodes::_invokevirtual: 2608 case Bytecodes::_invokespecial: 2609 case Bytecodes::_invokestatic: 2610 case Bytecodes::_invokeinterface: 2611 { 2612 Bytecode_invoke invoke(sd->method(), sd->bci()); 2613 st->print(" "); 2614 if (invoke.name() != NULL) 2615 invoke.name()->print_symbol_on(st); 2616 else 2617 st->print("<UNKNOWN>"); 2618 break; 2619 } 2620 case Bytecodes::_getfield: 2621 case Bytecodes::_putfield: 2622 case Bytecodes::_getstatic: 2623 case Bytecodes::_putstatic: 2624 { 2625 Bytecode_field field(sd->method(), sd->bci()); 2626 st->print(" "); 2627 if (field.name() != NULL) 2628 field.name()->print_symbol_on(st); 2629 else 2630 st->print("<UNKNOWN>"); 2631 } 2632 default: 2633 break; 2634 } 2635 } 2636 st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop()); 2637 } 2638 2639 // Print all scopes 2640 for (;sd != NULL; sd = sd->sender()) { 2641 st->move_to(column); 2642 st->print("; -"); 2643 if (sd->method() == NULL) { 2644 st->print("method is NULL"); 2645 } else { 2646 sd->method()->print_short_name(st); 2647 } 2648 int lineno = sd->method()->line_number_from_bci(sd->bci()); 2649 if (lineno != -1) { 2650 st->print("@%d (line %d)", sd->bci(), lineno); 2651 } else { 2652 st->print("@%d", sd->bci()); 2653 } 2654 st->cr(); 2655 } 2656 } 2657 2658 // Print relocation information 2659 const char* str = reloc_string_for(begin, end); 2660 if (str != NULL) { 2661 if (sd != NULL) st->cr(); 2662 st->move_to(column); 2663 st->print("; {%s}", str); 2664 } 2665 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin()); 2666 if (cont_offset != 0) { 2667 st->move_to(column); 2668 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset)); 2669 } 2670 2671 } 2672 2673 class DirectNativeCallWrapper: public NativeCallWrapper { 2674 private: 2675 NativeCall* _call; 2676 2677 public: 2678 DirectNativeCallWrapper(NativeCall* call) : _call(call) {} 2679 2680 virtual address destination() const { return _call->destination(); } 2681 virtual address instruction_address() const { return _call->instruction_address(); } 2682 virtual address next_instruction_address() const { return _call->next_instruction_address(); } 2683 virtual address return_address() const { return _call->return_address(); } 2684 2685 virtual address get_resolve_call_stub(bool is_optimized) const { 2686 if (is_optimized) { 2687 return SharedRuntime::get_resolve_opt_virtual_call_stub(); 2688 } 2689 return SharedRuntime::get_resolve_virtual_call_stub(); 2690 } 2691 2692 virtual void set_destination_mt_safe(address dest) { 2693 #if INCLUDE_AOT 2694 if (UseAOT) { 2695 CodeBlob* callee = CodeCache::find_blob(dest); 2696 CompiledMethod* cm = callee->as_compiled_method_or_null(); 2697 if (cm != NULL && cm->is_far_code()) { 2698 // Temporary fix, see JDK-8143106 2699 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address()); 2700 csc->set_to_far(methodHandle(cm->method()), dest); 2701 return; 2702 } 2703 } 2704 #endif 2705 _call->set_destination_mt_safe(dest); 2706 } 2707 2708 virtual void set_to_interpreted(const methodHandle& method, CompiledICInfo& info) { 2709 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address()); 2710 #if INCLUDE_AOT 2711 if (info.to_aot()) { 2712 csc->set_to_far(method, info.entry()); 2713 } else 2714 #endif 2715 { 2716 csc->set_to_interpreted(method, info.entry()); 2717 } 2718 } 2719 2720 virtual void verify() const { 2721 // make sure code pattern is actually a call imm32 instruction 2722 _call->verify(); 2723 if (os::is_MP()) { 2724 _call->verify_alignment(); 2725 } 2726 } 2727 2728 virtual void verify_resolve_call(address dest) const { 2729 CodeBlob* db = CodeCache::find_blob_unsafe(dest); 2730 assert(!db->is_adapter_blob(), "must use stub!"); 2731 } 2732 2733 virtual bool is_call_to_interpreted(address dest) const { 2734 CodeBlob* cb = CodeCache::find_blob(_call->instruction_address()); 2735 return cb->contains(dest); 2736 } 2737 2738 virtual bool is_safe_for_patching() const { return false; } 2739 2740 virtual NativeInstruction* get_load_instruction(virtual_call_Relocation* r) const { 2741 return nativeMovConstReg_at(r->cached_value()); 2742 } 2743 2744 virtual void *get_data(NativeInstruction* instruction) const { 2745 return (void*)((NativeMovConstReg*) instruction)->data(); 2746 } 2747 2748 virtual void set_data(NativeInstruction* instruction, intptr_t data) { 2749 ((NativeMovConstReg*) instruction)->set_data(data); 2750 } 2751 }; 2752 2753 NativeCallWrapper* nmethod::call_wrapper_at(address call) const { 2754 return new DirectNativeCallWrapper((NativeCall*) call); 2755 } 2756 2757 NativeCallWrapper* nmethod::call_wrapper_before(address return_pc) const { 2758 return new DirectNativeCallWrapper(nativeCall_before(return_pc)); 2759 } 2760 2761 address nmethod::call_instruction_address(address pc) const { 2762 if (NativeCall::is_call_before(pc)) { 2763 NativeCall *ncall = nativeCall_before(pc); 2764 return ncall->instruction_address(); 2765 } 2766 return NULL; 2767 } 2768 2769 CompiledStaticCall* nmethod::compiledStaticCall_at(Relocation* call_site) const { 2770 return CompiledDirectStaticCall::at(call_site); 2771 } 2772 2773 CompiledStaticCall* nmethod::compiledStaticCall_at(address call_site) const { 2774 return CompiledDirectStaticCall::at(call_site); 2775 } 2776 2777 CompiledStaticCall* nmethod::compiledStaticCall_before(address return_addr) const { 2778 return CompiledDirectStaticCall::before(return_addr); 2779 } 2780 2781 #ifndef PRODUCT 2782 2783 void nmethod::print_value_on(outputStream* st) const { 2784 st->print("nmethod"); 2785 print_on(st, NULL); 2786 } 2787 2788 void nmethod::print_calls(outputStream* st) { 2789 RelocIterator iter(this); 2790 while (iter.next()) { 2791 switch (iter.type()) { 2792 case relocInfo::virtual_call_type: 2793 case relocInfo::opt_virtual_call_type: { 2794 VerifyMutexLocker mc(CompiledIC_lock); 2795 CompiledIC_at(&iter)->print(); 2796 break; 2797 } 2798 case relocInfo::static_call_type: 2799 st->print_cr("Static call at " INTPTR_FORMAT, p2i(iter.reloc()->addr())); 2800 CompiledDirectStaticCall::at(iter.reloc())->print(); 2801 break; 2802 default: 2803 break; 2804 } 2805 } 2806 } 2807 2808 void nmethod::print_handler_table() { 2809 ExceptionHandlerTable(this).print(); 2810 } 2811 2812 void nmethod::print_nul_chk_table() { 2813 ImplicitExceptionTable(this).print(code_begin()); 2814 } 2815 2816 void nmethod::print_statistics() { 2817 ttyLocker ttyl; 2818 if (xtty != NULL) xtty->head("statistics type='nmethod'"); 2819 native_nmethod_stats.print_native_nmethod_stats(); 2820 #ifdef COMPILER1 2821 c1_java_nmethod_stats.print_nmethod_stats("C1"); 2822 #endif 2823 #ifdef COMPILER2 2824 c2_java_nmethod_stats.print_nmethod_stats("C2"); 2825 #endif 2826 #if INCLUDE_JVMCI 2827 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI"); 2828 #endif 2829 unknown_java_nmethod_stats.print_nmethod_stats("Unknown"); 2830 DebugInformationRecorder::print_statistics(); 2831 #ifndef PRODUCT 2832 pc_nmethod_stats.print_pc_stats(); 2833 #endif 2834 Dependencies::print_statistics(); 2835 if (xtty != NULL) xtty->tail("statistics"); 2836 } 2837 2838 #endif // !PRODUCT 2839 2840 #if INCLUDE_JVMCI 2841 void nmethod::clear_jvmci_installed_code() { 2842 assert_locked_or_safepoint(Patching_lock); 2843 if (_jvmci_installed_code != NULL) { 2844 JNIHandles::destroy_weak_global(_jvmci_installed_code); 2845 _jvmci_installed_code = NULL; 2846 } 2847 } 2848 2849 void nmethod::clear_speculation_log() { 2850 assert_locked_or_safepoint(Patching_lock); 2851 if (_speculation_log != NULL) { 2852 JNIHandles::destroy_weak_global(_speculation_log); 2853 _speculation_log = NULL; 2854 } 2855 } 2856 2857 void nmethod::maybe_invalidate_installed_code() { 2858 assert(Patching_lock->is_locked() || 2859 SafepointSynchronize::is_at_safepoint(), "should be performed under a lock for consistency"); 2860 oop installed_code = JNIHandles::resolve(_jvmci_installed_code); 2861 if (installed_code != NULL) { 2862 // Update the values in the InstalledCode instance if it still refers to this nmethod 2863 nmethod* nm = (nmethod*)InstalledCode::address(installed_code); 2864 if (nm == this) { 2865 if (!is_alive()) { 2866 // Break the link between nmethod and InstalledCode such that the nmethod 2867 // can subsequently be flushed safely. The link must be maintained while 2868 // the method could have live activations since invalidateInstalledCode 2869 // might want to invalidate all existing activations. 2870 InstalledCode::set_address(installed_code, 0); 2871 InstalledCode::set_entryPoint(installed_code, 0); 2872 } else if (is_not_entrant()) { 2873 // Remove the entry point so any invocation will fail but keep 2874 // the address link around that so that existing activations can 2875 // be invalidated. 2876 InstalledCode::set_entryPoint(installed_code, 0); 2877 } 2878 } 2879 } 2880 if (!is_alive()) { 2881 // Clear these out after the nmethod has been unregistered and any 2882 // updates to the InstalledCode instance have been performed. 2883 clear_jvmci_installed_code(); 2884 clear_speculation_log(); 2885 } 2886 } 2887 2888 void nmethod::invalidate_installed_code(Handle installedCode, TRAPS) { 2889 if (installedCode() == NULL) { 2890 THROW(vmSymbols::java_lang_NullPointerException()); 2891 } 2892 jlong nativeMethod = InstalledCode::address(installedCode); 2893 nmethod* nm = (nmethod*)nativeMethod; 2894 if (nm == NULL) { 2895 // Nothing to do 2896 return; 2897 } 2898 2899 nmethodLocker nml(nm); 2900 #ifdef ASSERT 2901 { 2902 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 2903 // This relationship can only be checked safely under a lock 2904 assert(!nm->is_alive() || nm->jvmci_installed_code() == installedCode(), "sanity check"); 2905 } 2906 #endif 2907 2908 if (nm->is_alive()) { 2909 // Invalidating the InstalledCode means we want the nmethod 2910 // to be deoptimized. 2911 nm->mark_for_deoptimization(); 2912 VM_Deoptimize op; 2913 VMThread::execute(&op); 2914 } 2915 2916 // Multiple threads could reach this point so we now need to 2917 // lock and re-check the link to the nmethod so that only one 2918 // thread clears it. 2919 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 2920 if (InstalledCode::address(installedCode) == nativeMethod) { 2921 InstalledCode::set_address(installedCode, 0); 2922 } 2923 } 2924 2925 oop nmethod::jvmci_installed_code() { 2926 return JNIHandles::resolve(_jvmci_installed_code); 2927 } 2928 2929 oop nmethod::speculation_log() { 2930 return JNIHandles::resolve(_speculation_log); 2931 } 2932 2933 char* nmethod::jvmci_installed_code_name(char* buf, size_t buflen) { 2934 if (!this->is_compiled_by_jvmci()) { 2935 return NULL; 2936 } 2937 oop installed_code = JNIHandles::resolve(_jvmci_installed_code); 2938 if (installed_code != NULL) { 2939 oop installed_code_name = NULL; 2940 if (installed_code->is_a(InstalledCode::klass())) { 2941 installed_code_name = InstalledCode::name(installed_code); 2942 } 2943 if (installed_code_name != NULL) { 2944 return java_lang_String::as_utf8_string(installed_code_name, buf, (int)buflen); 2945 } 2946 } 2947 return NULL; 2948 } 2949 #endif