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 "code/codeCache.hpp" 27 #include "code/compiledIC.hpp" 28 #include "code/dependencies.hpp" 29 #include "code/nativeInst.hpp" 30 #include "code/nmethod.hpp" 31 #include "code/scopeDesc.hpp" 32 #include "compiler/abstractCompiler.hpp" 33 #include "compiler/compileBroker.hpp" 34 #include "compiler/compileLog.hpp" 35 #include "compiler/compilerDirectives.hpp" 36 #include "compiler/directivesParser.hpp" 37 #include "compiler/disassembler.hpp" 38 #include "interpreter/bytecode.hpp" 39 #include "logging/log.hpp" 40 #include "logging/logStream.hpp" 41 #include "memory/resourceArea.hpp" 42 #include "oops/methodData.hpp" 43 #include "oops/oop.inline.hpp" 44 #include "prims/jvm.h" 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 = in_use; 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 #endif 413 } 414 415 nmethod* nmethod::new_native_nmethod(const methodHandle& method, 416 int compile_id, 417 CodeBuffer *code_buffer, 418 int vep_offset, 419 int frame_complete, 420 int frame_size, 421 ByteSize basic_lock_owner_sp_offset, 422 ByteSize basic_lock_sp_offset, 423 OopMapSet* oop_maps) { 424 code_buffer->finalize_oop_references(method); 425 // create nmethod 426 nmethod* nm = NULL; 427 { 428 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 429 int native_nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod)); 430 CodeOffsets offsets; 431 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset); 432 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete); 433 nm = new (native_nmethod_size, CompLevel_none) nmethod(method(), compiler_none, native_nmethod_size, 434 compile_id, &offsets, 435 code_buffer, frame_size, 436 basic_lock_owner_sp_offset, 437 basic_lock_sp_offset, oop_maps); 438 NOT_PRODUCT(if (nm != NULL) native_nmethod_stats.note_native_nmethod(nm)); 439 } 440 // verify nmethod 441 debug_only(if (nm) nm->verify();) // might block 442 443 if (nm != NULL) { 444 nm->log_new_nmethod(); 445 } 446 447 return nm; 448 } 449 450 nmethod* nmethod::new_nmethod(const methodHandle& method, 451 int compile_id, 452 int entry_bci, 453 CodeOffsets* offsets, 454 int orig_pc_offset, 455 DebugInformationRecorder* debug_info, 456 Dependencies* dependencies, 457 CodeBuffer* code_buffer, int frame_size, 458 OopMapSet* oop_maps, 459 ExceptionHandlerTable* handler_table, 460 ImplicitExceptionTable* nul_chk_table, 461 AbstractCompiler* compiler, 462 int comp_level 463 #if INCLUDE_JVMCI 464 , Handle installed_code, 465 Handle speculationLog 466 #endif 467 ) 468 { 469 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); 470 code_buffer->finalize_oop_references(method); 471 // create nmethod 472 nmethod* nm = NULL; 473 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 474 int nmethod_size = 475 CodeBlob::allocation_size(code_buffer, sizeof(nmethod)) 476 + adjust_pcs_size(debug_info->pcs_size()) 477 + align_up((int)dependencies->size_in_bytes(), oopSize) 478 + align_up(handler_table->size_in_bytes() , oopSize) 479 + align_up(nul_chk_table->size_in_bytes() , oopSize) 480 + align_up(debug_info->data_size() , oopSize); 481 482 nm = new (nmethod_size, comp_level) 483 nmethod(method(), compiler->type(), nmethod_size, compile_id, entry_bci, offsets, 484 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size, 485 oop_maps, 486 handler_table, 487 nul_chk_table, 488 compiler, 489 comp_level 490 #if INCLUDE_JVMCI 491 , installed_code, 492 speculationLog 493 #endif 494 ); 495 496 if (nm != NULL) { 497 // To make dependency checking during class loading fast, record 498 // the nmethod dependencies in the classes it is dependent on. 499 // This allows the dependency checking code to simply walk the 500 // class hierarchy above the loaded class, checking only nmethods 501 // which are dependent on those classes. The slow way is to 502 // check every nmethod for dependencies which makes it linear in 503 // the number of methods compiled. For applications with a lot 504 // classes the slow way is too slow. 505 for (Dependencies::DepStream deps(nm); deps.next(); ) { 506 if (deps.type() == Dependencies::call_site_target_value) { 507 // CallSite dependencies are managed on per-CallSite instance basis. 508 oop call_site = deps.argument_oop(0); 509 MethodHandles::add_dependent_nmethod(call_site, nm); 510 } else { 511 Klass* klass = deps.context_type(); 512 if (klass == NULL) { 513 continue; // ignore things like evol_method 514 } 515 // record this nmethod as dependent on this klass 516 InstanceKlass::cast(klass)->add_dependent_nmethod(nm); 517 } 518 } 519 NOT_PRODUCT(if (nm != NULL) note_java_nmethod(nm)); 520 } 521 } 522 // Do verification and logging outside CodeCache_lock. 523 if (nm != NULL) { 524 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet. 525 DEBUG_ONLY(nm->verify();) 526 nm->log_new_nmethod(); 527 } 528 return nm; 529 } 530 531 // For native wrappers 532 nmethod::nmethod( 533 Method* method, 534 CompilerType type, 535 int nmethod_size, 536 int compile_id, 537 CodeOffsets* offsets, 538 CodeBuffer* code_buffer, 539 int frame_size, 540 ByteSize basic_lock_owner_sp_offset, 541 ByteSize basic_lock_sp_offset, 542 OopMapSet* oop_maps ) 543 : CompiledMethod(method, "native nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false), 544 _native_receiver_sp_offset(basic_lock_owner_sp_offset), 545 _native_basic_lock_sp_offset(basic_lock_sp_offset) 546 { 547 { 548 int scopes_data_offset = 0; 549 int deoptimize_offset = 0; 550 int deoptimize_mh_offset = 0; 551 552 debug_only(NoSafepointVerifier nsv;) 553 assert_locked_or_safepoint(CodeCache_lock); 554 555 init_defaults(); 556 _entry_bci = InvocationEntryBci; 557 // We have no exception handler or deopt handler make the 558 // values something that will never match a pc like the nmethod vtable entry 559 _exception_offset = 0; 560 _orig_pc_offset = 0; 561 562 _consts_offset = data_offset(); 563 _stub_offset = data_offset(); 564 _oops_offset = data_offset(); 565 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize); 566 scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize); 567 _scopes_pcs_offset = scopes_data_offset; 568 _dependencies_offset = _scopes_pcs_offset; 569 _handler_table_offset = _dependencies_offset; 570 _nul_chk_table_offset = _handler_table_offset; 571 _nmethod_end_offset = _nul_chk_table_offset; 572 _compile_id = compile_id; 573 _comp_level = CompLevel_none; 574 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 575 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 576 _osr_entry_point = NULL; 577 _exception_cache = NULL; 578 _pc_desc_container.reset_to(NULL); 579 _hotness_counter = NMethodSweeper::hotness_counter_reset_val(); 580 581 _scopes_data_begin = (address) this + scopes_data_offset; 582 _deopt_handler_begin = (address) this + deoptimize_offset; 583 _deopt_mh_handler_begin = (address) this + deoptimize_mh_offset; 584 585 code_buffer->copy_code_and_locs_to(this); 586 code_buffer->copy_values_to(this); 587 if (ScavengeRootsInCode) { 588 Universe::heap()->register_nmethod(this); 589 } 590 debug_only(Universe::heap()->verify_nmethod(this)); 591 CodeCache::commit(this); 592 } 593 594 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) { 595 ttyLocker ttyl; // keep the following output all in one block 596 // This output goes directly to the tty, not the compiler log. 597 // To enable tools to match it up with the compilation activity, 598 // be sure to tag this tty output with the compile ID. 599 if (xtty != NULL) { 600 xtty->begin_head("print_native_nmethod"); 601 xtty->method(_method); 602 xtty->stamp(); 603 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this); 604 } 605 // print the header part first 606 print(); 607 // then print the requested information 608 if (PrintNativeNMethods) { 609 print_code(); 610 if (oop_maps != NULL) { 611 oop_maps->print(); 612 } 613 } 614 if (PrintRelocations) { 615 print_relocations(); 616 } 617 if (xtty != NULL) { 618 xtty->tail("print_native_nmethod"); 619 } 620 } 621 } 622 623 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () { 624 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level)); 625 } 626 627 nmethod::nmethod( 628 Method* method, 629 CompilerType type, 630 int nmethod_size, 631 int compile_id, 632 int entry_bci, 633 CodeOffsets* offsets, 634 int orig_pc_offset, 635 DebugInformationRecorder* debug_info, 636 Dependencies* dependencies, 637 CodeBuffer *code_buffer, 638 int frame_size, 639 OopMapSet* oop_maps, 640 ExceptionHandlerTable* handler_table, 641 ImplicitExceptionTable* nul_chk_table, 642 AbstractCompiler* compiler, 643 int comp_level 644 #if INCLUDE_JVMCI 645 , Handle installed_code, 646 Handle speculation_log 647 #endif 648 ) 649 : CompiledMethod(method, "nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false), 650 _native_receiver_sp_offset(in_ByteSize(-1)), 651 _native_basic_lock_sp_offset(in_ByteSize(-1)) 652 { 653 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); 654 { 655 debug_only(NoSafepointVerifier nsv;) 656 assert_locked_or_safepoint(CodeCache_lock); 657 658 _deopt_handler_begin = (address) this; 659 _deopt_mh_handler_begin = (address) this; 660 661 init_defaults(); 662 _entry_bci = entry_bci; 663 _compile_id = compile_id; 664 _comp_level = comp_level; 665 _orig_pc_offset = orig_pc_offset; 666 _hotness_counter = NMethodSweeper::hotness_counter_reset_val(); 667 668 // Section offsets 669 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts()); 670 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs()); 671 set_ctable_begin(header_begin() + _consts_offset); 672 673 #if INCLUDE_JVMCI 674 _jvmci_installed_code = installed_code(); 675 _speculation_log = (instanceOop)speculation_log(); 676 677 if (compiler->is_jvmci()) { 678 // JVMCI might not produce any stub sections 679 if (offsets->value(CodeOffsets::Exceptions) != -1) { 680 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions); 681 } else { 682 _exception_offset = -1; 683 } 684 if (offsets->value(CodeOffsets::Deopt) != -1) { 685 _deopt_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::Deopt); 686 } else { 687 _deopt_handler_begin = NULL; 688 } 689 if (offsets->value(CodeOffsets::DeoptMH) != -1) { 690 _deopt_mh_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::DeoptMH); 691 } else { 692 _deopt_mh_handler_begin = NULL; 693 } 694 } else { 695 #endif 696 // Exception handler and deopt handler are in the stub section 697 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set"); 698 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set"); 699 700 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions); 701 _deopt_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::Deopt); 702 if (offsets->value(CodeOffsets::DeoptMH) != -1) { 703 _deopt_mh_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::DeoptMH); 704 } else { 705 _deopt_mh_handler_begin = NULL; 706 #if INCLUDE_JVMCI 707 } 708 #endif 709 } 710 if (offsets->value(CodeOffsets::UnwindHandler) != -1) { 711 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler); 712 } else { 713 _unwind_handler_offset = -1; 714 } 715 716 _oops_offset = data_offset(); 717 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize); 718 int scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize); 719 720 _scopes_pcs_offset = scopes_data_offset + align_up(debug_info->data_size (), oopSize); 721 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size()); 722 _handler_table_offset = _dependencies_offset + align_up((int)dependencies->size_in_bytes (), oopSize); 723 _nul_chk_table_offset = _handler_table_offset + align_up(handler_table->size_in_bytes(), oopSize); 724 _nmethod_end_offset = _nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize); 725 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 726 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 727 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry); 728 _exception_cache = NULL; 729 730 _scopes_data_begin = (address) this + scopes_data_offset; 731 732 _pc_desc_container.reset_to(scopes_pcs_begin()); 733 734 code_buffer->copy_code_and_locs_to(this); 735 // Copy contents of ScopeDescRecorder to nmethod 736 code_buffer->copy_values_to(this); 737 debug_info->copy_to(this); 738 dependencies->copy_to(this); 739 if (ScavengeRootsInCode) { 740 Universe::heap()->register_nmethod(this); 741 } 742 debug_only(Universe::heap()->verify_nmethod(this)); 743 744 CodeCache::commit(this); 745 746 // Copy contents of ExceptionHandlerTable to nmethod 747 handler_table->copy_to(this); 748 nul_chk_table->copy_to(this); 749 750 // we use the information of entry points to find out if a method is 751 // static or non static 752 assert(compiler->is_c2() || compiler->is_jvmci() || 753 _method->is_static() == (entry_point() == _verified_entry_point), 754 " entry points must be same for static methods and vice versa"); 755 } 756 } 757 758 // Print a short set of xml attributes to identify this nmethod. The 759 // output should be embedded in some other element. 760 void nmethod::log_identity(xmlStream* log) const { 761 log->print(" compile_id='%d'", compile_id()); 762 const char* nm_kind = compile_kind(); 763 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind); 764 log->print(" compiler='%s'", compiler_name()); 765 if (TieredCompilation) { 766 log->print(" level='%d'", comp_level()); 767 } 768 } 769 770 771 #define LOG_OFFSET(log, name) \ 772 if (p2i(name##_end()) - p2i(name##_begin())) \ 773 log->print(" " XSTR(name) "_offset='" INTX_FORMAT "'" , \ 774 p2i(name##_begin()) - p2i(this)) 775 776 777 void nmethod::log_new_nmethod() const { 778 if (LogCompilation && xtty != NULL) { 779 ttyLocker ttyl; 780 HandleMark hm; 781 xtty->begin_elem("nmethod"); 782 log_identity(xtty); 783 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size()); 784 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this)); 785 786 LOG_OFFSET(xtty, relocation); 787 LOG_OFFSET(xtty, consts); 788 LOG_OFFSET(xtty, insts); 789 LOG_OFFSET(xtty, stub); 790 LOG_OFFSET(xtty, scopes_data); 791 LOG_OFFSET(xtty, scopes_pcs); 792 LOG_OFFSET(xtty, dependencies); 793 LOG_OFFSET(xtty, handler_table); 794 LOG_OFFSET(xtty, nul_chk_table); 795 LOG_OFFSET(xtty, oops); 796 LOG_OFFSET(xtty, metadata); 797 798 xtty->method(method()); 799 xtty->stamp(); 800 xtty->end_elem(); 801 } 802 } 803 804 #undef LOG_OFFSET 805 806 807 // Print out more verbose output usually for a newly created nmethod. 808 void nmethod::print_on(outputStream* st, const char* msg) const { 809 if (st != NULL) { 810 ttyLocker ttyl; 811 if (WizardMode) { 812 CompileTask::print(st, this, msg, /*short_form:*/ true); 813 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this)); 814 } else { 815 CompileTask::print(st, this, msg, /*short_form:*/ false); 816 } 817 } 818 } 819 820 void nmethod::maybe_print_nmethod(DirectiveSet* directive) { 821 bool printnmethods = directive->PrintAssemblyOption || directive->PrintNMethodsOption; 822 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) { 823 print_nmethod(printnmethods); 824 } 825 } 826 827 void nmethod::print_nmethod(bool printmethod) { 828 ttyLocker ttyl; // keep the following output all in one block 829 if (xtty != NULL) { 830 xtty->begin_head("print_nmethod"); 831 xtty->stamp(); 832 xtty->end_head(); 833 } 834 // print the header part first 835 print(); 836 // then print the requested information 837 if (printmethod) { 838 print_code(); 839 print_pcs(); 840 if (oop_maps()) { 841 oop_maps()->print(); 842 } 843 } 844 if (printmethod || PrintDebugInfo || CompilerOracle::has_option_string(_method, "PrintDebugInfo")) { 845 print_scopes(); 846 } 847 if (printmethod || PrintRelocations || CompilerOracle::has_option_string(_method, "PrintRelocations")) { 848 print_relocations(); 849 } 850 if (printmethod || PrintDependencies || CompilerOracle::has_option_string(_method, "PrintDependencies")) { 851 print_dependencies(); 852 } 853 if (printmethod || PrintExceptionHandlers) { 854 print_handler_table(); 855 print_nul_chk_table(); 856 } 857 if (printmethod) { 858 print_recorded_oops(); 859 print_recorded_metadata(); 860 } 861 if (xtty != NULL) { 862 xtty->tail("print_nmethod"); 863 } 864 } 865 866 867 // Promote one word from an assembly-time handle to a live embedded oop. 868 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) { 869 if (handle == NULL || 870 // As a special case, IC oops are initialized to 1 or -1. 871 handle == (jobject) Universe::non_oop_word()) { 872 (*dest) = (oop) handle; 873 } else { 874 (*dest) = JNIHandles::resolve_non_null(handle); 875 } 876 } 877 878 879 // Have to have the same name because it's called by a template 880 void nmethod::copy_values(GrowableArray<jobject>* array) { 881 int length = array->length(); 882 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough"); 883 oop* dest = oops_begin(); 884 for (int index = 0 ; index < length; index++) { 885 initialize_immediate_oop(&dest[index], array->at(index)); 886 } 887 888 // Now we can fix up all the oops in the code. We need to do this 889 // in the code because the assembler uses jobjects as placeholders. 890 // The code and relocations have already been initialized by the 891 // CodeBlob constructor, so it is valid even at this early point to 892 // iterate over relocations and patch the code. 893 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true); 894 } 895 896 void nmethod::copy_values(GrowableArray<Metadata*>* array) { 897 int length = array->length(); 898 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough"); 899 Metadata** dest = metadata_begin(); 900 for (int index = 0 ; index < length; index++) { 901 dest[index] = array->at(index); 902 } 903 } 904 905 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) { 906 // re-patch all oop-bearing instructions, just in case some oops moved 907 RelocIterator iter(this, begin, end); 908 while (iter.next()) { 909 if (iter.type() == relocInfo::oop_type) { 910 oop_Relocation* reloc = iter.oop_reloc(); 911 if (initialize_immediates && reloc->oop_is_immediate()) { 912 oop* dest = reloc->oop_addr(); 913 initialize_immediate_oop(dest, (jobject) *dest); 914 } 915 // Refresh the oop-related bits of this instruction. 916 reloc->fix_oop_relocation(); 917 } else if (iter.type() == relocInfo::metadata_type) { 918 metadata_Relocation* reloc = iter.metadata_reloc(); 919 reloc->fix_metadata_relocation(); 920 } 921 } 922 } 923 924 925 void nmethod::verify_clean_inline_caches() { 926 assert_locked_or_safepoint(CompiledIC_lock); 927 928 // If the method is not entrant or zombie then a JMP is plastered over the 929 // first few bytes. If an oop in the old code was there, that oop 930 // should not get GC'd. Skip the first few bytes of oops on 931 // not-entrant methods. 932 address low_boundary = verified_entry_point(); 933 if (!is_in_use()) { 934 low_boundary += NativeJump::instruction_size; 935 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 936 // This means that the low_boundary is going to be a little too high. 937 // This shouldn't matter, since oops of non-entrant methods are never used. 938 // In fact, why are we bothering to look at oops in a non-entrant method?? 939 } 940 941 ResourceMark rm; 942 RelocIterator iter(this, low_boundary); 943 while(iter.next()) { 944 switch(iter.type()) { 945 case relocInfo::virtual_call_type: 946 case relocInfo::opt_virtual_call_type: { 947 CompiledIC *ic = CompiledIC_at(&iter); 948 // Ok, to lookup references to zombies here 949 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination()); 950 nmethod* nm = cb->as_nmethod_or_null(); 951 if( nm != NULL ) { 952 // Verify that inline caches pointing to both zombie and not_entrant methods are clean 953 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 954 assert(ic->is_clean(), "IC should be clean"); 955 } 956 } 957 break; 958 } 959 case relocInfo::static_call_type: { 960 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc()); 961 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination()); 962 nmethod* nm = cb->as_nmethod_or_null(); 963 if( nm != NULL ) { 964 // Verify that inline caches pointing to both zombie and not_entrant methods are clean 965 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 966 assert(csc->is_clean(), "IC should be clean"); 967 } 968 } 969 break; 970 } 971 default: 972 break; 973 } 974 } 975 } 976 977 // This is a private interface with the sweeper. 978 void nmethod::mark_as_seen_on_stack() { 979 assert(is_alive(), "Must be an alive method"); 980 // Set the traversal mark to ensure that the sweeper does 2 981 // cleaning passes before moving to zombie. 982 set_stack_traversal_mark(NMethodSweeper::traversal_count()); 983 } 984 985 // Tell if a non-entrant method can be converted to a zombie (i.e., 986 // there are no activations on the stack, not in use by the VM, 987 // and not in use by the ServiceThread) 988 bool nmethod::can_convert_to_zombie() { 989 assert(is_not_entrant(), "must be a non-entrant method"); 990 991 // Since the nmethod sweeper only does partial sweep the sweeper's traversal 992 // count can be greater than the stack traversal count before it hits the 993 // nmethod for the second time. 994 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count() && 995 !is_locked_by_vm(); 996 } 997 998 void nmethod::inc_decompile_count() { 999 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return; 1000 // Could be gated by ProfileTraps, but do not bother... 1001 Method* m = method(); 1002 if (m == NULL) return; 1003 MethodData* mdo = m->method_data(); 1004 if (mdo == NULL) return; 1005 // There is a benign race here. See comments in methodData.hpp. 1006 mdo->inc_decompile_count(); 1007 } 1008 1009 void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) { 1010 1011 post_compiled_method_unload(); 1012 1013 // Since this nmethod is being unloaded, make sure that dependencies 1014 // recorded in instanceKlasses get flushed and pass non-NULL closure to 1015 // indicate that this work is being done during a GC. 1016 assert(Universe::heap()->is_gc_active(), "should only be called during gc"); 1017 assert(is_alive != NULL, "Should be non-NULL"); 1018 // A non-NULL is_alive closure indicates that this is being called during GC. 1019 flush_dependencies(is_alive); 1020 1021 // Break cycle between nmethod & method 1022 LogTarget(Trace, class, unload) lt; 1023 if (lt.is_enabled()) { 1024 LogStream ls(lt); 1025 ls.print_cr("making nmethod " INTPTR_FORMAT 1026 " unloadable, Method*(" INTPTR_FORMAT 1027 "), cause(" INTPTR_FORMAT ")", 1028 p2i(this), p2i(_method), p2i(cause)); 1029 if (!Universe::heap()->is_gc_active()) 1030 cause->klass()->print_on(&ls); 1031 } 1032 // Unlink the osr method, so we do not look this up again 1033 if (is_osr_method()) { 1034 // Invalidate the osr nmethod only once 1035 if (is_in_use()) { 1036 invalidate_osr_method(); 1037 } 1038 #ifdef ASSERT 1039 if (method() != NULL) { 1040 // Make sure osr nmethod is invalidated, i.e. not on the list 1041 bool found = method()->method_holder()->remove_osr_nmethod(this); 1042 assert(!found, "osr nmethod should have been invalidated"); 1043 } 1044 #endif 1045 } 1046 1047 // If _method is already NULL the Method* is about to be unloaded, 1048 // so we don't have to break the cycle. Note that it is possible to 1049 // have the Method* live here, in case we unload the nmethod because 1050 // it is pointing to some oop (other than the Method*) being unloaded. 1051 if (_method != NULL) { 1052 // OSR methods point to the Method*, but the Method* does not 1053 // point back! 1054 if (_method->code() == this) { 1055 _method->clear_code(); // Break a cycle 1056 } 1057 _method = NULL; // Clear the method of this dead nmethod 1058 } 1059 1060 // Make the class unloaded - i.e., change state and notify sweeper 1061 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); 1062 if (is_in_use()) { 1063 // Transitioning directly from live to unloaded -- so 1064 // we need to force a cache clean-up; remember this 1065 // for later on. 1066 CodeCache::set_needs_cache_clean(true); 1067 } 1068 1069 // Unregister must be done before the state change 1070 Universe::heap()->unregister_nmethod(this); 1071 1072 _state = unloaded; 1073 1074 // Log the unloading. 1075 log_state_change(); 1076 1077 #if INCLUDE_JVMCI 1078 // The method can only be unloaded after the pointer to the installed code 1079 // Java wrapper is no longer alive. Here we need to clear out this weak 1080 // reference to the dead object. Nulling out the reference has to happen 1081 // after the method is unregistered since the original value may be still 1082 // tracked by the rset. 1083 maybe_invalidate_installed_code(); 1084 // Clear these out after the nmethod has been unregistered and any 1085 // updates to the InstalledCode instance have been performed. 1086 _jvmci_installed_code = NULL; 1087 _speculation_log = NULL; 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(unsigned 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 #ifdef JVMCI 1250 _jvmci_installed_code = NULL; 1251 _speculation_log = NULL; 1252 #endif 1253 } 1254 flush_dependencies(NULL); 1255 } 1256 1257 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload 1258 // event and it hasn't already been reported for this nmethod then 1259 // report it now. The event may have been reported earlier if the GC 1260 // marked it for unloading). JvmtiDeferredEventQueue support means 1261 // we no longer go to a safepoint here. 1262 post_compiled_method_unload(); 1263 1264 #ifdef ASSERT 1265 // It's no longer safe to access the oops section since zombie 1266 // nmethods aren't scanned for GC. 1267 _oops_are_stale = true; 1268 #endif 1269 // the Method may be reclaimed by class unloading now that the 1270 // nmethod is in zombie state 1271 set_method(NULL); 1272 } else { 1273 assert(state == not_entrant, "other cases may need to be handled differently"); 1274 } 1275 1276 if (TraceCreateZombies) { 1277 ResourceMark m; 1278 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"); 1279 } 1280 1281 NMethodSweeper::report_state_change(this); 1282 return true; 1283 } 1284 1285 void nmethod::flush() { 1286 // Note that there are no valid oops in the nmethod anymore. 1287 assert(!is_osr_method() || is_unloaded() || is_zombie(), 1288 "osr nmethod must be unloaded or zombie before flushing"); 1289 assert(is_zombie() || is_osr_method(), "must be a zombie method"); 1290 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed"); 1291 assert_locked_or_safepoint(CodeCache_lock); 1292 1293 // completely deallocate this method 1294 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, p2i(this)); 1295 if (PrintMethodFlushing) { 1296 tty->print_cr("*flushing %s nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT 1297 "/Free CodeCache:" SIZE_FORMAT "Kb", 1298 is_osr_method() ? "osr" : "",_compile_id, p2i(this), CodeCache::blob_count(), 1299 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024); 1300 } 1301 1302 // We need to deallocate any ExceptionCache data. 1303 // Note that we do not need to grab the nmethod lock for this, it 1304 // better be thread safe if we're disposing of it! 1305 ExceptionCache* ec = exception_cache(); 1306 set_exception_cache(NULL); 1307 while(ec != NULL) { 1308 ExceptionCache* next = ec->next(); 1309 delete ec; 1310 ec = next; 1311 } 1312 1313 if (on_scavenge_root_list()) { 1314 CodeCache::drop_scavenge_root_nmethod(this); 1315 } 1316 1317 CodeBlob::flush(); 1318 CodeCache::free(this); 1319 } 1320 1321 // 1322 // Notify all classes this nmethod is dependent on that it is no 1323 // longer dependent. This should only be called in two situations. 1324 // First, when a nmethod transitions to a zombie all dependents need 1325 // to be clear. Since zombification happens at a safepoint there's no 1326 // synchronization issues. The second place is a little more tricky. 1327 // During phase 1 of mark sweep class unloading may happen and as a 1328 // result some nmethods may get unloaded. In this case the flushing 1329 // of dependencies must happen during phase 1 since after GC any 1330 // dependencies in the unloaded nmethod won't be updated, so 1331 // traversing the dependency information in unsafe. In that case this 1332 // function is called with a non-NULL argument and this function only 1333 // notifies instanceKlasses that are reachable 1334 1335 void nmethod::flush_dependencies(BoolObjectClosure* is_alive) { 1336 assert_locked_or_safepoint(CodeCache_lock); 1337 assert(Universe::heap()->is_gc_active() == (is_alive != NULL), 1338 "is_alive is non-NULL if and only if we are called during GC"); 1339 if (!has_flushed_dependencies()) { 1340 set_has_flushed_dependencies(); 1341 for (Dependencies::DepStream deps(this); deps.next(); ) { 1342 if (deps.type() == Dependencies::call_site_target_value) { 1343 // CallSite dependencies are managed on per-CallSite instance basis. 1344 oop call_site = deps.argument_oop(0); 1345 MethodHandles::remove_dependent_nmethod(call_site, this); 1346 } else { 1347 Klass* klass = deps.context_type(); 1348 if (klass == NULL) { 1349 continue; // ignore things like evol_method 1350 } 1351 // During GC the is_alive closure is non-NULL, and is used to 1352 // determine liveness of dependees that need to be updated. 1353 if (is_alive == NULL || klass->is_loader_alive(is_alive)) { 1354 // The GC defers deletion of this entry, since there might be multiple threads 1355 // iterating over the _dependencies graph. Other call paths are single-threaded 1356 // and may delete it immediately. 1357 bool delete_immediately = is_alive == NULL; 1358 InstanceKlass::cast(klass)->remove_dependent_nmethod(this, delete_immediately); 1359 } 1360 } 1361 } 1362 } 1363 } 1364 1365 1366 // If this oop is not live, the nmethod can be unloaded. 1367 bool nmethod::can_unload(BoolObjectClosure* is_alive, oop* root, bool unloading_occurred) { 1368 assert(root != NULL, "just checking"); 1369 oop obj = *root; 1370 if (obj == NULL || is_alive->do_object_b(obj)) { 1371 return false; 1372 } 1373 1374 // If ScavengeRootsInCode is true, an nmethod might be unloaded 1375 // simply because one of its constant oops has gone dead. 1376 // No actual classes need to be unloaded in order for this to occur. 1377 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading"); 1378 make_unloaded(is_alive, obj); 1379 return true; 1380 } 1381 1382 // ------------------------------------------------------------------ 1383 // post_compiled_method_load_event 1384 // new method for install_code() path 1385 // Transfer information from compilation to jvmti 1386 void nmethod::post_compiled_method_load_event() { 1387 1388 Method* moop = method(); 1389 HOTSPOT_COMPILED_METHOD_LOAD( 1390 (char *) moop->klass_name()->bytes(), 1391 moop->klass_name()->utf8_length(), 1392 (char *) moop->name()->bytes(), 1393 moop->name()->utf8_length(), 1394 (char *) moop->signature()->bytes(), 1395 moop->signature()->utf8_length(), 1396 insts_begin(), insts_size()); 1397 1398 if (JvmtiExport::should_post_compiled_method_load() || 1399 JvmtiExport::should_post_compiled_method_unload()) { 1400 get_and_cache_jmethod_id(); 1401 } 1402 1403 if (JvmtiExport::should_post_compiled_method_load()) { 1404 // Let the Service thread (which is a real Java thread) post the event 1405 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); 1406 JvmtiDeferredEventQueue::enqueue( 1407 JvmtiDeferredEvent::compiled_method_load_event(this)); 1408 } 1409 } 1410 1411 jmethodID nmethod::get_and_cache_jmethod_id() { 1412 if (_jmethod_id == NULL) { 1413 // Cache the jmethod_id since it can no longer be looked up once the 1414 // method itself has been marked for unloading. 1415 _jmethod_id = method()->jmethod_id(); 1416 } 1417 return _jmethod_id; 1418 } 1419 1420 void nmethod::post_compiled_method_unload() { 1421 if (unload_reported()) { 1422 // During unloading we transition to unloaded and then to zombie 1423 // and the unloading is reported during the first transition. 1424 return; 1425 } 1426 1427 assert(_method != NULL && !is_unloaded(), "just checking"); 1428 DTRACE_METHOD_UNLOAD_PROBE(method()); 1429 1430 // If a JVMTI agent has enabled the CompiledMethodUnload event then 1431 // post the event. Sometime later this nmethod will be made a zombie 1432 // by the sweeper but the Method* will not be valid at that point. 1433 // If the _jmethod_id is null then no load event was ever requested 1434 // so don't bother posting the unload. The main reason for this is 1435 // that the jmethodID is a weak reference to the Method* so if 1436 // it's being unloaded there's no way to look it up since the weak 1437 // ref will have been cleared. 1438 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) { 1439 assert(!unload_reported(), "already unloaded"); 1440 JvmtiDeferredEvent event = 1441 JvmtiDeferredEvent::compiled_method_unload_event(this, 1442 _jmethod_id, insts_begin()); 1443 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); 1444 JvmtiDeferredEventQueue::enqueue(event); 1445 } 1446 1447 // The JVMTI CompiledMethodUnload event can be enabled or disabled at 1448 // any time. As the nmethod is being unloaded now we mark it has 1449 // having the unload event reported - this will ensure that we don't 1450 // attempt to report the event in the unlikely scenario where the 1451 // event is enabled at the time the nmethod is made a zombie. 1452 set_unload_reported(); 1453 } 1454 1455 bool nmethod::unload_if_dead_at(RelocIterator* iter_at_oop, BoolObjectClosure *is_alive, bool unloading_occurred) { 1456 assert(iter_at_oop->type() == relocInfo::oop_type, "Wrong relocation type"); 1457 1458 oop_Relocation* r = iter_at_oop->oop_reloc(); 1459 // Traverse those oops directly embedded in the code. 1460 // Other oops (oop_index>0) are seen as part of scopes_oops. 1461 assert(1 == (r->oop_is_immediate()) + 1462 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 1463 "oop must be found in exactly one place"); 1464 if (r->oop_is_immediate() && r->oop_value() != NULL) { 1465 // Unload this nmethod if the oop is dead. 1466 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) { 1467 return true;; 1468 } 1469 } 1470 1471 return false; 1472 } 1473 1474 bool nmethod::do_unloading_scopes(BoolObjectClosure* is_alive, bool unloading_occurred) { 1475 // Scopes 1476 for (oop* p = oops_begin(); p < oops_end(); p++) { 1477 if (*p == Universe::non_oop_word()) continue; // skip non-oops 1478 if (can_unload(is_alive, p, unloading_occurred)) { 1479 return true; 1480 } 1481 } 1482 return false; 1483 } 1484 1485 bool nmethod::do_unloading_oops(address low_boundary, BoolObjectClosure* is_alive, bool unloading_occurred) { 1486 // Compiled code 1487 { 1488 RelocIterator iter(this, low_boundary); 1489 while (iter.next()) { 1490 if (iter.type() == relocInfo::oop_type) { 1491 if (unload_if_dead_at(&iter, is_alive, unloading_occurred)) { 1492 return true; 1493 } 1494 } 1495 } 1496 } 1497 1498 return do_unloading_scopes(is_alive, unloading_occurred); 1499 } 1500 1501 #if INCLUDE_JVMCI 1502 bool nmethod::do_unloading_jvmci(BoolObjectClosure* is_alive, bool unloading_occurred) { 1503 bool is_unloaded = false; 1504 // Follow JVMCI method 1505 BarrierSet* bs = Universe::heap()->barrier_set(); 1506 if (_jvmci_installed_code != NULL) { 1507 if (_jvmci_installed_code->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(_jvmci_installed_code)) { 1508 if (!is_alive->do_object_b(_jvmci_installed_code)) { 1509 clear_jvmci_installed_code(); 1510 } 1511 } else { 1512 if (can_unload(is_alive, (oop*)&_jvmci_installed_code, unloading_occurred)) { 1513 return true; 1514 } 1515 } 1516 } 1517 1518 if (_speculation_log != NULL) { 1519 if (!is_alive->do_object_b(_speculation_log)) { 1520 bs->write_ref_nmethod_pre(&_speculation_log, this); 1521 _speculation_log = NULL; 1522 bs->write_ref_nmethod_post(&_speculation_log, this); 1523 } 1524 } 1525 return is_unloaded; 1526 } 1527 #endif 1528 1529 // Iterate over metadata calling this function. Used by RedefineClasses 1530 void nmethod::metadata_do(void f(Metadata*)) { 1531 address low_boundary = verified_entry_point(); 1532 if (is_not_entrant()) { 1533 low_boundary += NativeJump::instruction_size; 1534 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1535 // (See comment above.) 1536 } 1537 { 1538 // Visit all immediate references that are embedded in the instruction stream. 1539 RelocIterator iter(this, low_boundary); 1540 while (iter.next()) { 1541 if (iter.type() == relocInfo::metadata_type ) { 1542 metadata_Relocation* r = iter.metadata_reloc(); 1543 // In this metadata, we must only follow those metadatas directly embedded in 1544 // the code. Other metadatas (oop_index>0) are seen as part of 1545 // the metadata section below. 1546 assert(1 == (r->metadata_is_immediate()) + 1547 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()), 1548 "metadata must be found in exactly one place"); 1549 if (r->metadata_is_immediate() && r->metadata_value() != NULL) { 1550 Metadata* md = r->metadata_value(); 1551 if (md != _method) f(md); 1552 } 1553 } else if (iter.type() == relocInfo::virtual_call_type) { 1554 // Check compiledIC holders associated with this nmethod 1555 CompiledIC *ic = CompiledIC_at(&iter); 1556 if (ic->is_icholder_call()) { 1557 CompiledICHolder* cichk = ic->cached_icholder(); 1558 f(cichk->holder_method()); 1559 f(cichk->holder_klass()); 1560 } else { 1561 Metadata* ic_oop = ic->cached_metadata(); 1562 if (ic_oop != NULL) { 1563 f(ic_oop); 1564 } 1565 } 1566 } 1567 } 1568 } 1569 1570 // Visit the metadata section 1571 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) { 1572 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops 1573 Metadata* md = *p; 1574 f(md); 1575 } 1576 1577 // Visit metadata not embedded in the other places. 1578 if (_method != NULL) f(_method); 1579 } 1580 1581 void nmethod::oops_do(OopClosure* f, bool allow_zombie) { 1582 // make sure the oops ready to receive visitors 1583 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod"); 1584 assert(!is_unloaded(), "should not call follow on unloaded nmethod"); 1585 1586 // If the method is not entrant or zombie then a JMP is plastered over the 1587 // first few bytes. If an oop in the old code was there, that oop 1588 // should not get GC'd. Skip the first few bytes of oops on 1589 // not-entrant methods. 1590 address low_boundary = verified_entry_point(); 1591 if (is_not_entrant()) { 1592 low_boundary += NativeJump::instruction_size; 1593 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1594 // (See comment above.) 1595 } 1596 1597 #if INCLUDE_JVMCI 1598 if (_jvmci_installed_code != NULL) { 1599 f->do_oop((oop*) &_jvmci_installed_code); 1600 } 1601 if (_speculation_log != NULL) { 1602 f->do_oop((oop*) &_speculation_log); 1603 } 1604 #endif 1605 1606 RelocIterator iter(this, low_boundary); 1607 1608 while (iter.next()) { 1609 if (iter.type() == relocInfo::oop_type ) { 1610 oop_Relocation* r = iter.oop_reloc(); 1611 // In this loop, we must only follow those oops directly embedded in 1612 // the code. Other oops (oop_index>0) are seen as part of scopes_oops. 1613 assert(1 == (r->oop_is_immediate()) + 1614 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 1615 "oop must be found in exactly one place"); 1616 if (r->oop_is_immediate() && r->oop_value() != NULL) { 1617 f->do_oop(r->oop_addr()); 1618 } 1619 } 1620 } 1621 1622 // Scopes 1623 // This includes oop constants not inlined in the code stream. 1624 for (oop* p = oops_begin(); p < oops_end(); p++) { 1625 if (*p == Universe::non_oop_word()) continue; // skip non-oops 1626 f->do_oop(p); 1627 } 1628 } 1629 1630 #define NMETHOD_SENTINEL ((nmethod*)badAddress) 1631 1632 nmethod* volatile nmethod::_oops_do_mark_nmethods; 1633 1634 // An nmethod is "marked" if its _mark_link is set non-null. 1635 // Even if it is the end of the linked list, it will have a non-null link value, 1636 // as long as it is on the list. 1637 // This code must be MP safe, because it is used from parallel GC passes. 1638 bool nmethod::test_set_oops_do_mark() { 1639 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called"); 1640 if (_oops_do_mark_link == NULL) { 1641 // Claim this nmethod for this thread to mark. 1642 if (Atomic::cmpxchg(NMETHOD_SENTINEL, &_oops_do_mark_link, (nmethod*)NULL) == NULL) { 1643 // Atomically append this nmethod (now claimed) to the head of the list: 1644 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods; 1645 for (;;) { 1646 nmethod* required_mark_nmethods = observed_mark_nmethods; 1647 _oops_do_mark_link = required_mark_nmethods; 1648 observed_mark_nmethods = 1649 Atomic::cmpxchg(this, &_oops_do_mark_nmethods, required_mark_nmethods); 1650 if (observed_mark_nmethods == required_mark_nmethods) 1651 break; 1652 } 1653 // Mark was clear when we first saw this guy. 1654 if (TraceScavenge) { print_on(tty, "oops_do, mark"); } 1655 return false; 1656 } 1657 } 1658 // On fall through, another racing thread marked this nmethod before we did. 1659 return true; 1660 } 1661 1662 void nmethod::oops_do_marking_prologue() { 1663 if (TraceScavenge) { tty->print_cr("[oops_do_marking_prologue"); } 1664 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row"); 1665 // We use cmpxchg instead of regular assignment here because the user 1666 // may fork a bunch of threads, and we need them all to see the same state. 1667 nmethod* observed = Atomic::cmpxchg(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, (nmethod*)NULL); 1668 guarantee(observed == NULL, "no races in this sequential code"); 1669 } 1670 1671 void nmethod::oops_do_marking_epilogue() { 1672 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row"); 1673 nmethod* cur = _oops_do_mark_nmethods; 1674 while (cur != NMETHOD_SENTINEL) { 1675 assert(cur != NULL, "not NULL-terminated"); 1676 nmethod* next = cur->_oops_do_mark_link; 1677 cur->_oops_do_mark_link = NULL; 1678 DEBUG_ONLY(cur->verify_oop_relocations()); 1679 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark")); 1680 cur = next; 1681 } 1682 nmethod* required = _oops_do_mark_nmethods; 1683 nmethod* observed = Atomic::cmpxchg((nmethod*)NULL, &_oops_do_mark_nmethods, required); 1684 guarantee(observed == required, "no races in this sequential code"); 1685 if (TraceScavenge) { tty->print_cr("oops_do_marking_epilogue]"); } 1686 } 1687 1688 class DetectScavengeRoot: public OopClosure { 1689 bool _detected_scavenge_root; 1690 public: 1691 DetectScavengeRoot() : _detected_scavenge_root(false) 1692 { NOT_PRODUCT(_print_nm = NULL); } 1693 bool detected_scavenge_root() { return _detected_scavenge_root; } 1694 virtual void do_oop(oop* p) { 1695 if ((*p) != NULL && (*p)->is_scavengable()) { 1696 NOT_PRODUCT(maybe_print(p)); 1697 _detected_scavenge_root = true; 1698 } 1699 } 1700 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 1701 1702 #ifndef PRODUCT 1703 nmethod* _print_nm; 1704 void maybe_print(oop* p) { 1705 if (_print_nm == NULL) return; 1706 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root"); 1707 tty->print_cr("" PTR_FORMAT "[offset=%d] detected scavengable oop " PTR_FORMAT " (found at " PTR_FORMAT ")", 1708 p2i(_print_nm), (int)((intptr_t)p - (intptr_t)_print_nm), 1709 p2i(*p), p2i(p)); 1710 (*p)->print(); 1711 } 1712 #endif //PRODUCT 1713 }; 1714 1715 bool nmethod::detect_scavenge_root_oops() { 1716 DetectScavengeRoot detect_scavenge_root; 1717 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this); 1718 oops_do(&detect_scavenge_root); 1719 return detect_scavenge_root.detected_scavenge_root(); 1720 } 1721 1722 inline bool includes(void* p, void* from, void* to) { 1723 return from <= p && p < to; 1724 } 1725 1726 1727 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) { 1728 assert(count >= 2, "must be sentinel values, at least"); 1729 1730 #ifdef ASSERT 1731 // must be sorted and unique; we do a binary search in find_pc_desc() 1732 int prev_offset = pcs[0].pc_offset(); 1733 assert(prev_offset == PcDesc::lower_offset_limit, 1734 "must start with a sentinel"); 1735 for (int i = 1; i < count; i++) { 1736 int this_offset = pcs[i].pc_offset(); 1737 assert(this_offset > prev_offset, "offsets must be sorted"); 1738 prev_offset = this_offset; 1739 } 1740 assert(prev_offset == PcDesc::upper_offset_limit, 1741 "must end with a sentinel"); 1742 #endif //ASSERT 1743 1744 // Search for MethodHandle invokes and tag the nmethod. 1745 for (int i = 0; i < count; i++) { 1746 if (pcs[i].is_method_handle_invoke()) { 1747 set_has_method_handle_invokes(true); 1748 break; 1749 } 1750 } 1751 assert(has_method_handle_invokes() == (_deopt_mh_handler_begin != NULL), "must have deopt mh handler"); 1752 1753 int size = count * sizeof(PcDesc); 1754 assert(scopes_pcs_size() >= size, "oob"); 1755 memcpy(scopes_pcs_begin(), pcs, size); 1756 1757 // Adjust the final sentinel downward. 1758 PcDesc* last_pc = &scopes_pcs_begin()[count-1]; 1759 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity"); 1760 last_pc->set_pc_offset(content_size() + 1); 1761 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) { 1762 // Fill any rounding gaps with copies of the last record. 1763 last_pc[1] = last_pc[0]; 1764 } 1765 // The following assert could fail if sizeof(PcDesc) is not 1766 // an integral multiple of oopSize (the rounding term). 1767 // If it fails, change the logic to always allocate a multiple 1768 // of sizeof(PcDesc), and fill unused words with copies of *last_pc. 1769 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly"); 1770 } 1771 1772 void nmethod::copy_scopes_data(u_char* buffer, int size) { 1773 assert(scopes_data_size() >= size, "oob"); 1774 memcpy(scopes_data_begin(), buffer, size); 1775 } 1776 1777 #ifdef ASSERT 1778 static PcDesc* linear_search(const PcDescSearch& search, int pc_offset, bool approximate) { 1779 PcDesc* lower = search.scopes_pcs_begin(); 1780 PcDesc* upper = search.scopes_pcs_end(); 1781 lower += 1; // exclude initial sentinel 1782 PcDesc* res = NULL; 1783 for (PcDesc* p = lower; p < upper; p++) { 1784 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc 1785 if (match_desc(p, pc_offset, approximate)) { 1786 if (res == NULL) 1787 res = p; 1788 else 1789 res = (PcDesc*) badAddress; 1790 } 1791 } 1792 return res; 1793 } 1794 #endif 1795 1796 1797 // Finds a PcDesc with real-pc equal to "pc" 1798 PcDesc* PcDescContainer::find_pc_desc_internal(address pc, bool approximate, const PcDescSearch& search) { 1799 address base_address = search.code_begin(); 1800 if ((pc < base_address) || 1801 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) { 1802 return NULL; // PC is wildly out of range 1803 } 1804 int pc_offset = (int) (pc - base_address); 1805 1806 // Check the PcDesc cache if it contains the desired PcDesc 1807 // (This as an almost 100% hit rate.) 1808 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate); 1809 if (res != NULL) { 1810 assert(res == linear_search(search, pc_offset, approximate), "cache ok"); 1811 return res; 1812 } 1813 1814 // Fallback algorithm: quasi-linear search for the PcDesc 1815 // Find the last pc_offset less than the given offset. 1816 // The successor must be the required match, if there is a match at all. 1817 // (Use a fixed radix to avoid expensive affine pointer arithmetic.) 1818 PcDesc* lower = search.scopes_pcs_begin(); 1819 PcDesc* upper = search.scopes_pcs_end(); 1820 upper -= 1; // exclude final sentinel 1821 if (lower >= upper) return NULL; // native method; no PcDescs at all 1822 1823 #define assert_LU_OK \ 1824 /* invariant on lower..upper during the following search: */ \ 1825 assert(lower->pc_offset() < pc_offset, "sanity"); \ 1826 assert(upper->pc_offset() >= pc_offset, "sanity") 1827 assert_LU_OK; 1828 1829 // Use the last successful return as a split point. 1830 PcDesc* mid = _pc_desc_cache.last_pc_desc(); 1831 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 1832 if (mid->pc_offset() < pc_offset) { 1833 lower = mid; 1834 } else { 1835 upper = mid; 1836 } 1837 1838 // Take giant steps at first (4096, then 256, then 16, then 1) 1839 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1); 1840 const int RADIX = (1 << LOG2_RADIX); 1841 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) { 1842 while ((mid = lower + step) < upper) { 1843 assert_LU_OK; 1844 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 1845 if (mid->pc_offset() < pc_offset) { 1846 lower = mid; 1847 } else { 1848 upper = mid; 1849 break; 1850 } 1851 } 1852 assert_LU_OK; 1853 } 1854 1855 // Sneak up on the value with a linear search of length ~16. 1856 while (true) { 1857 assert_LU_OK; 1858 mid = lower + 1; 1859 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 1860 if (mid->pc_offset() < pc_offset) { 1861 lower = mid; 1862 } else { 1863 upper = mid; 1864 break; 1865 } 1866 } 1867 #undef assert_LU_OK 1868 1869 if (match_desc(upper, pc_offset, approximate)) { 1870 assert(upper == linear_search(search, pc_offset, approximate), "search ok"); 1871 _pc_desc_cache.add_pc_desc(upper); 1872 return upper; 1873 } else { 1874 assert(NULL == linear_search(search, pc_offset, approximate), "search ok"); 1875 return NULL; 1876 } 1877 } 1878 1879 1880 void nmethod::check_all_dependencies(DepChange& changes) { 1881 // Checked dependencies are allocated into this ResourceMark 1882 ResourceMark rm; 1883 1884 // Turn off dependency tracing while actually testing dependencies. 1885 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) ); 1886 1887 typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash, 1888 &DependencySignature::equals, 11027> DepTable; 1889 1890 DepTable* table = new DepTable(); 1891 1892 // Iterate over live nmethods and check dependencies of all nmethods that are not 1893 // marked for deoptimization. A particular dependency is only checked once. 1894 NMethodIterator iter; 1895 while(iter.next()) { 1896 nmethod* nm = iter.method(); 1897 // Only notify for live nmethods 1898 if (nm->is_alive() && !nm->is_marked_for_deoptimization()) { 1899 for (Dependencies::DepStream deps(nm); deps.next(); ) { 1900 // Construct abstraction of a dependency. 1901 DependencySignature* current_sig = new DependencySignature(deps); 1902 1903 // Determine if dependency is already checked. table->put(...) returns 1904 // 'true' if the dependency is added (i.e., was not in the hashtable). 1905 if (table->put(*current_sig, 1)) { 1906 if (deps.check_dependency() != NULL) { 1907 // Dependency checking failed. Print out information about the failed 1908 // dependency and finally fail with an assert. We can fail here, since 1909 // dependency checking is never done in a product build. 1910 tty->print_cr("Failed dependency:"); 1911 changes.print(); 1912 nm->print(); 1913 nm->print_dependencies(); 1914 assert(false, "Should have been marked for deoptimization"); 1915 } 1916 } 1917 } 1918 } 1919 } 1920 } 1921 1922 bool nmethod::check_dependency_on(DepChange& changes) { 1923 // What has happened: 1924 // 1) a new class dependee has been added 1925 // 2) dependee and all its super classes have been marked 1926 bool found_check = false; // set true if we are upset 1927 for (Dependencies::DepStream deps(this); deps.next(); ) { 1928 // Evaluate only relevant dependencies. 1929 if (deps.spot_check_dependency_at(changes) != NULL) { 1930 found_check = true; 1931 NOT_DEBUG(break); 1932 } 1933 } 1934 return found_check; 1935 } 1936 1937 bool nmethod::is_evol_dependent_on(Klass* dependee) { 1938 InstanceKlass *dependee_ik = InstanceKlass::cast(dependee); 1939 Array<Method*>* dependee_methods = dependee_ik->methods(); 1940 for (Dependencies::DepStream deps(this); deps.next(); ) { 1941 if (deps.type() == Dependencies::evol_method) { 1942 Method* method = deps.method_argument(0); 1943 for (int j = 0; j < dependee_methods->length(); j++) { 1944 if (dependee_methods->at(j) == method) { 1945 if (log_is_enabled(Debug, redefine, class, nmethod)) { 1946 ResourceMark rm; 1947 log_debug(redefine, class, nmethod) 1948 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)", 1949 _method->method_holder()->external_name(), 1950 _method->name()->as_C_string(), 1951 _method->signature()->as_C_string(), 1952 compile_id(), 1953 method->method_holder()->external_name(), 1954 method->name()->as_C_string(), 1955 method->signature()->as_C_string()); 1956 } 1957 if (TraceDependencies || LogCompilation) 1958 deps.log_dependency(dependee); 1959 return true; 1960 } 1961 } 1962 } 1963 } 1964 return false; 1965 } 1966 1967 // Called from mark_for_deoptimization, when dependee is invalidated. 1968 bool nmethod::is_dependent_on_method(Method* dependee) { 1969 for (Dependencies::DepStream deps(this); deps.next(); ) { 1970 if (deps.type() != Dependencies::evol_method) 1971 continue; 1972 Method* method = deps.method_argument(0); 1973 if (method == dependee) return true; 1974 } 1975 return false; 1976 } 1977 1978 1979 bool nmethod::is_patchable_at(address instr_addr) { 1980 assert(insts_contains(instr_addr), "wrong nmethod used"); 1981 if (is_zombie()) { 1982 // a zombie may never be patched 1983 return false; 1984 } 1985 return true; 1986 } 1987 1988 1989 address nmethod::continuation_for_implicit_exception(address pc) { 1990 // Exception happened outside inline-cache check code => we are inside 1991 // an active nmethod => use cpc to determine a return address 1992 int exception_offset = pc - code_begin(); 1993 int cont_offset = ImplicitExceptionTable(this).at( exception_offset ); 1994 #ifdef ASSERT 1995 if (cont_offset == 0) { 1996 Thread* thread = Thread::current(); 1997 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY 1998 HandleMark hm(thread); 1999 ResourceMark rm(thread); 2000 CodeBlob* cb = CodeCache::find_blob(pc); 2001 assert(cb != NULL && cb == this, ""); 2002 ttyLocker ttyl; 2003 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, p2i(pc)); 2004 print(); 2005 method()->print_codes(); 2006 print_code(); 2007 print_pcs(); 2008 } 2009 #endif 2010 if (cont_offset == 0) { 2011 // Let the normal error handling report the exception 2012 return NULL; 2013 } 2014 return code_begin() + cont_offset; 2015 } 2016 2017 2018 2019 void nmethod_init() { 2020 // make sure you didn't forget to adjust the filler fields 2021 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word"); 2022 } 2023 2024 2025 //------------------------------------------------------------------------------------------- 2026 2027 2028 // QQQ might we make this work from a frame?? 2029 nmethodLocker::nmethodLocker(address pc) { 2030 CodeBlob* cb = CodeCache::find_blob(pc); 2031 guarantee(cb != NULL && cb->is_compiled(), "bad pc for a nmethod found"); 2032 _nm = cb->as_compiled_method(); 2033 lock_nmethod(_nm); 2034 } 2035 2036 // Only JvmtiDeferredEvent::compiled_method_unload_event() 2037 // should pass zombie_ok == true. 2038 void nmethodLocker::lock_nmethod(CompiledMethod* cm, bool zombie_ok) { 2039 if (cm == NULL) return; 2040 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method 2041 nmethod* nm = cm->as_nmethod(); 2042 Atomic::inc(&nm->_lock_count); 2043 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method"); 2044 } 2045 2046 void nmethodLocker::unlock_nmethod(CompiledMethod* cm) { 2047 if (cm == NULL) return; 2048 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method 2049 nmethod* nm = cm->as_nmethod(); 2050 Atomic::dec(&nm->_lock_count); 2051 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock"); 2052 } 2053 2054 2055 // ----------------------------------------------------------------------------- 2056 // Verification 2057 2058 class VerifyOopsClosure: public OopClosure { 2059 nmethod* _nm; 2060 bool _ok; 2061 public: 2062 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { } 2063 bool ok() { return _ok; } 2064 virtual void do_oop(oop* p) { 2065 if (oopDesc::is_oop_or_null(*p)) return; 2066 if (_ok) { 2067 _nm->print_nmethod(true); 2068 _ok = false; 2069 } 2070 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)", 2071 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm)); 2072 } 2073 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2074 }; 2075 2076 void nmethod::verify() { 2077 2078 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant 2079 // seems odd. 2080 2081 if (is_zombie() || is_not_entrant() || is_unloaded()) 2082 return; 2083 2084 // Make sure all the entry points are correctly aligned for patching. 2085 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point()); 2086 2087 // assert(oopDesc::is_oop(method()), "must be valid"); 2088 2089 ResourceMark rm; 2090 2091 if (!CodeCache::contains(this)) { 2092 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this)); 2093 } 2094 2095 if(is_native_method() ) 2096 return; 2097 2098 nmethod* nm = CodeCache::find_nmethod(verified_entry_point()); 2099 if (nm != this) { 2100 fatal("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this)); 2101 } 2102 2103 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2104 if (! p->verify(this)) { 2105 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this)); 2106 } 2107 } 2108 2109 VerifyOopsClosure voc(this); 2110 oops_do(&voc); 2111 assert(voc.ok(), "embedded oops must be OK"); 2112 Universe::heap()->verify_nmethod(this); 2113 2114 verify_scopes(); 2115 } 2116 2117 2118 void nmethod::verify_interrupt_point(address call_site) { 2119 // Verify IC only when nmethod installation is finished. 2120 bool is_installed = (method()->code() == this) // nmethod is in state 'in_use' and installed 2121 || !this->is_in_use(); // nmethod is installed, but not in 'in_use' state 2122 if (is_installed) { 2123 Thread *cur = Thread::current(); 2124 if (CompiledIC_lock->owner() == cur || 2125 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) && 2126 SafepointSynchronize::is_at_safepoint())) { 2127 CompiledIC_at(this, call_site); 2128 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); 2129 } else { 2130 MutexLocker ml_verify (CompiledIC_lock); 2131 CompiledIC_at(this, call_site); 2132 } 2133 } 2134 2135 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address()); 2136 assert(pd != NULL, "PcDesc must exist"); 2137 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(), 2138 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(), 2139 pd->return_oop()); 2140 !sd->is_top(); sd = sd->sender()) { 2141 sd->verify(); 2142 } 2143 } 2144 2145 void nmethod::verify_scopes() { 2146 if( !method() ) return; // Runtime stubs have no scope 2147 if (method()->is_native()) return; // Ignore stub methods. 2148 // iterate through all interrupt point 2149 // and verify the debug information is valid. 2150 RelocIterator iter((nmethod*)this); 2151 while (iter.next()) { 2152 address stub = NULL; 2153 switch (iter.type()) { 2154 case relocInfo::virtual_call_type: 2155 verify_interrupt_point(iter.addr()); 2156 break; 2157 case relocInfo::opt_virtual_call_type: 2158 stub = iter.opt_virtual_call_reloc()->static_stub(false); 2159 verify_interrupt_point(iter.addr()); 2160 break; 2161 case relocInfo::static_call_type: 2162 stub = iter.static_call_reloc()->static_stub(false); 2163 //verify_interrupt_point(iter.addr()); 2164 break; 2165 case relocInfo::runtime_call_type: 2166 case relocInfo::runtime_call_w_cp_type: { 2167 address destination = iter.reloc()->value(); 2168 // Right now there is no way to find out which entries support 2169 // an interrupt point. It would be nice if we had this 2170 // information in a table. 2171 break; 2172 } 2173 default: 2174 break; 2175 } 2176 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section"); 2177 } 2178 } 2179 2180 2181 // ----------------------------------------------------------------------------- 2182 // Non-product code 2183 #ifndef PRODUCT 2184 2185 class DebugScavengeRoot: public OopClosure { 2186 nmethod* _nm; 2187 bool _ok; 2188 public: 2189 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { } 2190 bool ok() { return _ok; } 2191 virtual void do_oop(oop* p) { 2192 if ((*p) == NULL || !(*p)->is_scavengable()) return; 2193 if (_ok) { 2194 _nm->print_nmethod(true); 2195 _ok = false; 2196 } 2197 tty->print_cr("*** scavengable oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)", 2198 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm)); 2199 (*p)->print(); 2200 } 2201 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2202 }; 2203 2204 void nmethod::verify_scavenge_root_oops() { 2205 if (!on_scavenge_root_list()) { 2206 // Actually look inside, to verify the claim that it's clean. 2207 DebugScavengeRoot debug_scavenge_root(this); 2208 oops_do(&debug_scavenge_root); 2209 if (!debug_scavenge_root.ok()) 2210 fatal("found an unadvertised bad scavengable oop in the code cache"); 2211 } 2212 assert(scavenge_root_not_marked(), ""); 2213 } 2214 2215 #endif // PRODUCT 2216 2217 // Printing operations 2218 2219 void nmethod::print() const { 2220 ResourceMark rm; 2221 ttyLocker ttyl; // keep the following output all in one block 2222 2223 tty->print("Compiled method "); 2224 2225 if (is_compiled_by_c1()) { 2226 tty->print("(c1) "); 2227 } else if (is_compiled_by_c2()) { 2228 tty->print("(c2) "); 2229 } else if (is_compiled_by_jvmci()) { 2230 tty->print("(JVMCI) "); 2231 } else { 2232 tty->print("(nm) "); 2233 } 2234 2235 print_on(tty, NULL); 2236 2237 if (WizardMode) { 2238 tty->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this)); 2239 tty->print(" for method " INTPTR_FORMAT , p2i(method())); 2240 tty->print(" { "); 2241 tty->print_cr("%s ", state()); 2242 if (on_scavenge_root_list()) tty->print("scavenge_root "); 2243 tty->print_cr("}:"); 2244 } 2245 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2246 p2i(this), 2247 p2i(this) + size(), 2248 size()); 2249 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2250 p2i(relocation_begin()), 2251 p2i(relocation_end()), 2252 relocation_size()); 2253 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2254 p2i(consts_begin()), 2255 p2i(consts_end()), 2256 consts_size()); 2257 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2258 p2i(insts_begin()), 2259 p2i(insts_end()), 2260 insts_size()); 2261 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2262 p2i(stub_begin()), 2263 p2i(stub_end()), 2264 stub_size()); 2265 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2266 p2i(oops_begin()), 2267 p2i(oops_end()), 2268 oops_size()); 2269 if (metadata_size () > 0) tty->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2270 p2i(metadata_begin()), 2271 p2i(metadata_end()), 2272 metadata_size()); 2273 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2274 p2i(scopes_data_begin()), 2275 p2i(scopes_data_end()), 2276 scopes_data_size()); 2277 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2278 p2i(scopes_pcs_begin()), 2279 p2i(scopes_pcs_end()), 2280 scopes_pcs_size()); 2281 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2282 p2i(dependencies_begin()), 2283 p2i(dependencies_end()), 2284 dependencies_size()); 2285 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2286 p2i(handler_table_begin()), 2287 p2i(handler_table_end()), 2288 handler_table_size()); 2289 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2290 p2i(nul_chk_table_begin()), 2291 p2i(nul_chk_table_end()), 2292 nul_chk_table_size()); 2293 } 2294 2295 #ifndef PRODUCT 2296 2297 void nmethod::print_scopes() { 2298 // Find the first pc desc for all scopes in the code and print it. 2299 ResourceMark rm; 2300 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2301 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null) 2302 continue; 2303 2304 ScopeDesc* sd = scope_desc_at(p->real_pc(this)); 2305 while (sd != NULL) { 2306 sd->print_on(tty, p); 2307 sd = sd->sender(); 2308 } 2309 } 2310 } 2311 2312 void nmethod::print_dependencies() { 2313 ResourceMark rm; 2314 ttyLocker ttyl; // keep the following output all in one block 2315 tty->print_cr("Dependencies:"); 2316 for (Dependencies::DepStream deps(this); deps.next(); ) { 2317 deps.print_dependency(); 2318 Klass* ctxk = deps.context_type(); 2319 if (ctxk != NULL) { 2320 if (ctxk->is_instance_klass() && InstanceKlass::cast(ctxk)->is_dependent_nmethod(this)) { 2321 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name()); 2322 } 2323 } 2324 deps.log_dependency(); // put it into the xml log also 2325 } 2326 } 2327 2328 2329 void nmethod::print_relocations() { 2330 ResourceMark m; // in case methods get printed via the debugger 2331 tty->print_cr("relocations:"); 2332 RelocIterator iter(this); 2333 iter.print(); 2334 } 2335 2336 2337 void nmethod::print_pcs() { 2338 ResourceMark m; // in case methods get printed via debugger 2339 tty->print_cr("pc-bytecode offsets:"); 2340 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2341 p->print(this); 2342 } 2343 } 2344 2345 void nmethod::print_recorded_oops() { 2346 tty->print_cr("Recorded oops:"); 2347 for (int i = 0; i < oops_count(); i++) { 2348 oop o = oop_at(i); 2349 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(o)); 2350 if (o == (oop)Universe::non_oop_word()) { 2351 tty->print("non-oop word"); 2352 } else { 2353 o->print_value(); 2354 } 2355 tty->cr(); 2356 } 2357 } 2358 2359 void nmethod::print_recorded_metadata() { 2360 tty->print_cr("Recorded metadata:"); 2361 for (int i = 0; i < metadata_count(); i++) { 2362 Metadata* m = metadata_at(i); 2363 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(m)); 2364 if (m == (Metadata*)Universe::non_oop_word()) { 2365 tty->print("non-metadata word"); 2366 } else { 2367 m->print_value_on_maybe_null(tty); 2368 } 2369 tty->cr(); 2370 } 2371 } 2372 2373 #endif // PRODUCT 2374 2375 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) { 2376 RelocIterator iter(this, begin, end); 2377 bool have_one = false; 2378 while (iter.next()) { 2379 have_one = true; 2380 switch (iter.type()) { 2381 case relocInfo::none: return "no_reloc"; 2382 case relocInfo::oop_type: { 2383 stringStream st; 2384 oop_Relocation* r = iter.oop_reloc(); 2385 oop obj = r->oop_value(); 2386 st.print("oop("); 2387 if (obj == NULL) st.print("NULL"); 2388 else obj->print_value_on(&st); 2389 st.print(")"); 2390 return st.as_string(); 2391 } 2392 case relocInfo::metadata_type: { 2393 stringStream st; 2394 metadata_Relocation* r = iter.metadata_reloc(); 2395 Metadata* obj = r->metadata_value(); 2396 st.print("metadata("); 2397 if (obj == NULL) st.print("NULL"); 2398 else obj->print_value_on(&st); 2399 st.print(")"); 2400 return st.as_string(); 2401 } 2402 case relocInfo::runtime_call_type: 2403 case relocInfo::runtime_call_w_cp_type: { 2404 stringStream st; 2405 st.print("runtime_call"); 2406 CallRelocation* r = (CallRelocation*)iter.reloc(); 2407 address dest = r->destination(); 2408 CodeBlob* cb = CodeCache::find_blob(dest); 2409 if (cb != NULL) { 2410 st.print(" %s", cb->name()); 2411 } else { 2412 ResourceMark rm; 2413 const int buflen = 1024; 2414 char* buf = NEW_RESOURCE_ARRAY(char, buflen); 2415 int offset; 2416 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) { 2417 st.print(" %s", buf); 2418 if (offset != 0) { 2419 st.print("+%d", offset); 2420 } 2421 } 2422 } 2423 return st.as_string(); 2424 } 2425 case relocInfo::virtual_call_type: { 2426 stringStream st; 2427 st.print_raw("virtual_call"); 2428 virtual_call_Relocation* r = iter.virtual_call_reloc(); 2429 Method* m = r->method_value(); 2430 if (m != NULL) { 2431 assert(m->is_method(), ""); 2432 m->print_short_name(&st); 2433 } 2434 return st.as_string(); 2435 } 2436 case relocInfo::opt_virtual_call_type: { 2437 stringStream st; 2438 st.print_raw("optimized virtual_call"); 2439 opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc(); 2440 Method* m = r->method_value(); 2441 if (m != NULL) { 2442 assert(m->is_method(), ""); 2443 m->print_short_name(&st); 2444 } 2445 return st.as_string(); 2446 } 2447 case relocInfo::static_call_type: { 2448 stringStream st; 2449 st.print_raw("static_call"); 2450 static_call_Relocation* r = iter.static_call_reloc(); 2451 Method* m = r->method_value(); 2452 if (m != NULL) { 2453 assert(m->is_method(), ""); 2454 m->print_short_name(&st); 2455 } 2456 return st.as_string(); 2457 } 2458 case relocInfo::static_stub_type: return "static_stub"; 2459 case relocInfo::external_word_type: return "external_word"; 2460 case relocInfo::internal_word_type: return "internal_word"; 2461 case relocInfo::section_word_type: return "section_word"; 2462 case relocInfo::poll_type: return "poll"; 2463 case relocInfo::poll_return_type: return "poll_return"; 2464 case relocInfo::type_mask: return "type_bit_mask"; 2465 2466 default: 2467 break; 2468 } 2469 } 2470 return have_one ? "other" : NULL; 2471 } 2472 2473 // Return a the last scope in (begin..end] 2474 ScopeDesc* nmethod::scope_desc_in(address begin, address end) { 2475 PcDesc* p = pc_desc_near(begin+1); 2476 if (p != NULL && p->real_pc(this) <= end) { 2477 return new ScopeDesc(this, p->scope_decode_offset(), 2478 p->obj_decode_offset(), p->should_reexecute(), p->rethrow_exception(), 2479 p->return_oop()); 2480 } 2481 return NULL; 2482 } 2483 2484 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const { 2485 if (block_begin == entry_point()) stream->print_cr("[Entry Point]"); 2486 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]"); 2487 if (JVMCI_ONLY(_exception_offset >= 0 &&) block_begin == exception_begin()) stream->print_cr("[Exception Handler]"); 2488 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]"); 2489 if (JVMCI_ONLY(_deopt_handler_begin != NULL &&) block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]"); 2490 2491 if (has_method_handle_invokes()) 2492 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]"); 2493 2494 if (block_begin == consts_begin()) stream->print_cr("[Constants]"); 2495 2496 if (block_begin == entry_point()) { 2497 methodHandle m = method(); 2498 if (m.not_null()) { 2499 stream->print(" # "); 2500 m->print_value_on(stream); 2501 stream->cr(); 2502 } 2503 if (m.not_null() && !is_osr_method()) { 2504 ResourceMark rm; 2505 int sizeargs = m->size_of_parameters(); 2506 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs); 2507 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs); 2508 { 2509 int sig_index = 0; 2510 if (!m->is_static()) 2511 sig_bt[sig_index++] = T_OBJECT; // 'this' 2512 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) { 2513 BasicType t = ss.type(); 2514 sig_bt[sig_index++] = t; 2515 if (type2size[t] == 2) { 2516 sig_bt[sig_index++] = T_VOID; 2517 } else { 2518 assert(type2size[t] == 1, "size is 1 or 2"); 2519 } 2520 } 2521 assert(sig_index == sizeargs, ""); 2522 } 2523 const char* spname = "sp"; // make arch-specific? 2524 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false); 2525 int stack_slot_offset = this->frame_size() * wordSize; 2526 int tab1 = 14, tab2 = 24; 2527 int sig_index = 0; 2528 int arg_index = (m->is_static() ? 0 : -1); 2529 bool did_old_sp = false; 2530 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) { 2531 bool at_this = (arg_index == -1); 2532 bool at_old_sp = false; 2533 BasicType t = (at_this ? T_OBJECT : ss.type()); 2534 assert(t == sig_bt[sig_index], "sigs in sync"); 2535 if (at_this) 2536 stream->print(" # this: "); 2537 else 2538 stream->print(" # parm%d: ", arg_index); 2539 stream->move_to(tab1); 2540 VMReg fst = regs[sig_index].first(); 2541 VMReg snd = regs[sig_index].second(); 2542 if (fst->is_reg()) { 2543 stream->print("%s", fst->name()); 2544 if (snd->is_valid()) { 2545 stream->print(":%s", snd->name()); 2546 } 2547 } else if (fst->is_stack()) { 2548 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset; 2549 if (offset == stack_slot_offset) at_old_sp = true; 2550 stream->print("[%s+0x%x]", spname, offset); 2551 } else { 2552 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd); 2553 } 2554 stream->print(" "); 2555 stream->move_to(tab2); 2556 stream->print("= "); 2557 if (at_this) { 2558 m->method_holder()->print_value_on(stream); 2559 } else { 2560 bool did_name = false; 2561 if (!at_this && ss.is_object()) { 2562 Symbol* name = ss.as_symbol_or_null(); 2563 if (name != NULL) { 2564 name->print_value_on(stream); 2565 did_name = true; 2566 } 2567 } 2568 if (!did_name) 2569 stream->print("%s", type2name(t)); 2570 } 2571 if (at_old_sp) { 2572 stream->print(" (%s of caller)", spname); 2573 did_old_sp = true; 2574 } 2575 stream->cr(); 2576 sig_index += type2size[t]; 2577 arg_index += 1; 2578 if (!at_this) ss.next(); 2579 } 2580 if (!did_old_sp) { 2581 stream->print(" # "); 2582 stream->move_to(tab1); 2583 stream->print("[%s+0x%x]", spname, stack_slot_offset); 2584 stream->print(" (%s of caller)", spname); 2585 stream->cr(); 2586 } 2587 } 2588 } 2589 } 2590 2591 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) { 2592 // First, find an oopmap in (begin, end]. 2593 // We use the odd half-closed interval so that oop maps and scope descs 2594 // which are tied to the byte after a call are printed with the call itself. 2595 address base = code_begin(); 2596 ImmutableOopMapSet* oms = oop_maps(); 2597 if (oms != NULL) { 2598 for (int i = 0, imax = oms->count(); i < imax; i++) { 2599 const ImmutableOopMapPair* pair = oms->pair_at(i); 2600 const ImmutableOopMap* om = pair->get_from(oms); 2601 address pc = base + pair->pc_offset(); 2602 if (pc > begin) { 2603 if (pc <= end) { 2604 st->move_to(column); 2605 st->print("; "); 2606 om->print_on(st); 2607 } 2608 break; 2609 } 2610 } 2611 } 2612 2613 // Print any debug info present at this pc. 2614 ScopeDesc* sd = scope_desc_in(begin, end); 2615 if (sd != NULL) { 2616 st->move_to(column); 2617 if (sd->bci() == SynchronizationEntryBCI) { 2618 st->print(";*synchronization entry"); 2619 } else { 2620 if (sd->method() == NULL) { 2621 st->print("method is NULL"); 2622 } else if (sd->method()->is_native()) { 2623 st->print("method is native"); 2624 } else { 2625 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci()); 2626 st->print(";*%s", Bytecodes::name(bc)); 2627 switch (bc) { 2628 case Bytecodes::_invokevirtual: 2629 case Bytecodes::_invokespecial: 2630 case Bytecodes::_invokestatic: 2631 case Bytecodes::_invokeinterface: 2632 { 2633 Bytecode_invoke invoke(sd->method(), sd->bci()); 2634 st->print(" "); 2635 if (invoke.name() != NULL) 2636 invoke.name()->print_symbol_on(st); 2637 else 2638 st->print("<UNKNOWN>"); 2639 break; 2640 } 2641 case Bytecodes::_getfield: 2642 case Bytecodes::_putfield: 2643 case Bytecodes::_getstatic: 2644 case Bytecodes::_putstatic: 2645 { 2646 Bytecode_field field(sd->method(), sd->bci()); 2647 st->print(" "); 2648 if (field.name() != NULL) 2649 field.name()->print_symbol_on(st); 2650 else 2651 st->print("<UNKNOWN>"); 2652 } 2653 default: 2654 break; 2655 } 2656 } 2657 st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop()); 2658 } 2659 2660 // Print all scopes 2661 for (;sd != NULL; sd = sd->sender()) { 2662 st->move_to(column); 2663 st->print("; -"); 2664 if (sd->method() == NULL) { 2665 st->print("method is NULL"); 2666 } else { 2667 sd->method()->print_short_name(st); 2668 } 2669 int lineno = sd->method()->line_number_from_bci(sd->bci()); 2670 if (lineno != -1) { 2671 st->print("@%d (line %d)", sd->bci(), lineno); 2672 } else { 2673 st->print("@%d", sd->bci()); 2674 } 2675 st->cr(); 2676 } 2677 } 2678 2679 // Print relocation information 2680 const char* str = reloc_string_for(begin, end); 2681 if (str != NULL) { 2682 if (sd != NULL) st->cr(); 2683 st->move_to(column); 2684 st->print("; {%s}", str); 2685 } 2686 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin()); 2687 if (cont_offset != 0) { 2688 st->move_to(column); 2689 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset)); 2690 } 2691 2692 } 2693 2694 class DirectNativeCallWrapper: public NativeCallWrapper { 2695 private: 2696 NativeCall* _call; 2697 2698 public: 2699 DirectNativeCallWrapper(NativeCall* call) : _call(call) {} 2700 2701 virtual address destination() const { return _call->destination(); } 2702 virtual address instruction_address() const { return _call->instruction_address(); } 2703 virtual address next_instruction_address() const { return _call->next_instruction_address(); } 2704 virtual address return_address() const { return _call->return_address(); } 2705 2706 virtual address get_resolve_call_stub(bool is_optimized) const { 2707 if (is_optimized) { 2708 return SharedRuntime::get_resolve_opt_virtual_call_stub(); 2709 } 2710 return SharedRuntime::get_resolve_virtual_call_stub(); 2711 } 2712 2713 virtual void set_destination_mt_safe(address dest) { 2714 #if INCLUDE_AOT 2715 if (UseAOT) { 2716 CodeBlob* callee = CodeCache::find_blob(dest); 2717 CompiledMethod* cm = callee->as_compiled_method_or_null(); 2718 if (cm != NULL && cm->is_far_code()) { 2719 // Temporary fix, see JDK-8143106 2720 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address()); 2721 csc->set_to_far(methodHandle(cm->method()), dest); 2722 return; 2723 } 2724 } 2725 #endif 2726 _call->set_destination_mt_safe(dest); 2727 } 2728 2729 virtual void set_to_interpreted(const methodHandle& method, CompiledICInfo& info) { 2730 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address()); 2731 #if INCLUDE_AOT 2732 if (info.to_aot()) { 2733 csc->set_to_far(method, info.entry()); 2734 } else 2735 #endif 2736 { 2737 csc->set_to_interpreted(method, info.entry()); 2738 } 2739 } 2740 2741 virtual void verify() const { 2742 // make sure code pattern is actually a call imm32 instruction 2743 _call->verify(); 2744 if (os::is_MP()) { 2745 _call->verify_alignment(); 2746 } 2747 } 2748 2749 virtual void verify_resolve_call(address dest) const { 2750 CodeBlob* db = CodeCache::find_blob_unsafe(dest); 2751 assert(!db->is_adapter_blob(), "must use stub!"); 2752 } 2753 2754 virtual bool is_call_to_interpreted(address dest) const { 2755 CodeBlob* cb = CodeCache::find_blob(_call->instruction_address()); 2756 return cb->contains(dest); 2757 } 2758 2759 virtual bool is_safe_for_patching() const { return false; } 2760 2761 virtual NativeInstruction* get_load_instruction(virtual_call_Relocation* r) const { 2762 return nativeMovConstReg_at(r->cached_value()); 2763 } 2764 2765 virtual void *get_data(NativeInstruction* instruction) const { 2766 return (void*)((NativeMovConstReg*) instruction)->data(); 2767 } 2768 2769 virtual void set_data(NativeInstruction* instruction, intptr_t data) { 2770 ((NativeMovConstReg*) instruction)->set_data(data); 2771 } 2772 }; 2773 2774 NativeCallWrapper* nmethod::call_wrapper_at(address call) const { 2775 return new DirectNativeCallWrapper((NativeCall*) call); 2776 } 2777 2778 NativeCallWrapper* nmethod::call_wrapper_before(address return_pc) const { 2779 return new DirectNativeCallWrapper(nativeCall_before(return_pc)); 2780 } 2781 2782 address nmethod::call_instruction_address(address pc) const { 2783 if (NativeCall::is_call_before(pc)) { 2784 NativeCall *ncall = nativeCall_before(pc); 2785 return ncall->instruction_address(); 2786 } 2787 return NULL; 2788 } 2789 2790 CompiledStaticCall* nmethod::compiledStaticCall_at(Relocation* call_site) const { 2791 return CompiledDirectStaticCall::at(call_site); 2792 } 2793 2794 CompiledStaticCall* nmethod::compiledStaticCall_at(address call_site) const { 2795 return CompiledDirectStaticCall::at(call_site); 2796 } 2797 2798 CompiledStaticCall* nmethod::compiledStaticCall_before(address return_addr) const { 2799 return CompiledDirectStaticCall::before(return_addr); 2800 } 2801 2802 #ifndef PRODUCT 2803 2804 void nmethod::print_value_on(outputStream* st) const { 2805 st->print("nmethod"); 2806 print_on(st, NULL); 2807 } 2808 2809 void nmethod::print_calls(outputStream* st) { 2810 RelocIterator iter(this); 2811 while (iter.next()) { 2812 switch (iter.type()) { 2813 case relocInfo::virtual_call_type: 2814 case relocInfo::opt_virtual_call_type: { 2815 VerifyMutexLocker mc(CompiledIC_lock); 2816 CompiledIC_at(&iter)->print(); 2817 break; 2818 } 2819 case relocInfo::static_call_type: 2820 st->print_cr("Static call at " INTPTR_FORMAT, p2i(iter.reloc()->addr())); 2821 CompiledDirectStaticCall::at(iter.reloc())->print(); 2822 break; 2823 default: 2824 break; 2825 } 2826 } 2827 } 2828 2829 void nmethod::print_handler_table() { 2830 ExceptionHandlerTable(this).print(); 2831 } 2832 2833 void nmethod::print_nul_chk_table() { 2834 ImplicitExceptionTable(this).print(code_begin()); 2835 } 2836 2837 void nmethod::print_statistics() { 2838 ttyLocker ttyl; 2839 if (xtty != NULL) xtty->head("statistics type='nmethod'"); 2840 native_nmethod_stats.print_native_nmethod_stats(); 2841 #ifdef COMPILER1 2842 c1_java_nmethod_stats.print_nmethod_stats("C1"); 2843 #endif 2844 #ifdef COMPILER2 2845 c2_java_nmethod_stats.print_nmethod_stats("C2"); 2846 #endif 2847 #if INCLUDE_JVMCI 2848 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI"); 2849 #endif 2850 unknown_java_nmethod_stats.print_nmethod_stats("Unknown"); 2851 DebugInformationRecorder::print_statistics(); 2852 #ifndef PRODUCT 2853 pc_nmethod_stats.print_pc_stats(); 2854 #endif 2855 Dependencies::print_statistics(); 2856 if (xtty != NULL) xtty->tail("statistics"); 2857 } 2858 2859 #endif // !PRODUCT 2860 2861 #if INCLUDE_JVMCI 2862 void nmethod::clear_jvmci_installed_code() { 2863 // write_ref_method_pre/post can only be safely called at a 2864 // safepoint or while holding the CodeCache_lock 2865 assert(CodeCache_lock->is_locked() || 2866 SafepointSynchronize::is_at_safepoint(), "should be performed under a lock for consistency"); 2867 if (_jvmci_installed_code != NULL) { 2868 // This must be done carefully to maintain nmethod remembered sets properly 2869 BarrierSet* bs = Universe::heap()->barrier_set(); 2870 bs->write_ref_nmethod_pre(&_jvmci_installed_code, this); 2871 _jvmci_installed_code = NULL; 2872 bs->write_ref_nmethod_post(&_jvmci_installed_code, this); 2873 } 2874 } 2875 2876 void nmethod::maybe_invalidate_installed_code() { 2877 assert(Patching_lock->is_locked() || 2878 SafepointSynchronize::is_at_safepoint(), "should be performed under a lock for consistency"); 2879 oop installed_code = jvmci_installed_code(); 2880 if (installed_code != NULL) { 2881 nmethod* nm = (nmethod*)InstalledCode::address(installed_code); 2882 if (nm == NULL || nm != this) { 2883 // The link has been broken or the InstalledCode instance is 2884 // associated with another nmethod so do nothing. 2885 return; 2886 } 2887 if (!is_alive()) { 2888 // Break the link between nmethod and InstalledCode such that the nmethod 2889 // can subsequently be flushed safely. The link must be maintained while 2890 // the method could have live activations since invalidateInstalledCode 2891 // might want to invalidate all existing activations. 2892 InstalledCode::set_address(installed_code, 0); 2893 InstalledCode::set_entryPoint(installed_code, 0); 2894 } else if (is_not_entrant()) { 2895 // Remove the entry point so any invocation will fail but keep 2896 // the address link around that so that existing activations can 2897 // be invalidated. 2898 InstalledCode::set_entryPoint(installed_code, 0); 2899 } 2900 } 2901 } 2902 2903 void nmethod::invalidate_installed_code(Handle installedCode, TRAPS) { 2904 if (installedCode() == NULL) { 2905 THROW(vmSymbols::java_lang_NullPointerException()); 2906 } 2907 jlong nativeMethod = InstalledCode::address(installedCode); 2908 nmethod* nm = (nmethod*)nativeMethod; 2909 if (nm == NULL) { 2910 // Nothing to do 2911 return; 2912 } 2913 2914 nmethodLocker nml(nm); 2915 #ifdef ASSERT 2916 { 2917 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 2918 // This relationship can only be checked safely under a lock 2919 assert(nm == NULL || !nm->is_alive() || nm->jvmci_installed_code() == installedCode(), "sanity check"); 2920 } 2921 #endif 2922 2923 if (nm->is_alive()) { 2924 // The nmethod state machinery maintains the link between the 2925 // HotSpotInstalledCode and nmethod* so as long as the nmethod appears to be 2926 // alive assume there is work to do and deoptimize the nmethod. 2927 nm->mark_for_deoptimization(); 2928 VM_Deoptimize op; 2929 VMThread::execute(&op); 2930 } 2931 2932 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 2933 // Check that it's still associated with the same nmethod and break 2934 // the link if it is. 2935 if (InstalledCode::address(installedCode) == nativeMethod) { 2936 InstalledCode::set_address(installedCode, 0); 2937 } 2938 } 2939 2940 char* nmethod::jvmci_installed_code_name(char* buf, size_t buflen) { 2941 if (!this->is_compiled_by_jvmci()) { 2942 return NULL; 2943 } 2944 oop installedCode = this->jvmci_installed_code(); 2945 if (installedCode != NULL) { 2946 oop installedCodeName = NULL; 2947 if (installedCode->is_a(InstalledCode::klass())) { 2948 installedCodeName = InstalledCode::name(installedCode); 2949 } 2950 if (installedCodeName != NULL) { 2951 return java_lang_String::as_utf8_string(installedCodeName, buf, (int)buflen); 2952 } else { 2953 jio_snprintf(buf, buflen, "null"); 2954 return buf; 2955 } 2956 } 2957 jio_snprintf(buf, buflen, "noInstalledCode"); 2958 return buf; 2959 } 2960 #endif