nmethod.cpp revision 7837:9c3b4e28183c
1/* 2 * Copyright (c) 1997, 2014, 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/nmethod.hpp" 30#include "code/scopeDesc.hpp" 31#include "compiler/abstractCompiler.hpp" 32#include "compiler/compileBroker.hpp" 33#include "compiler/compileLog.hpp" 34#include "compiler/compilerOracle.hpp" 35#include "compiler/disassembler.hpp" 36#include "interpreter/bytecode.hpp" 37#include "oops/methodData.hpp" 38#include "prims/jvmtiRedefineClassesTrace.hpp" 39#include "prims/jvmtiImpl.hpp" 40#include "runtime/atomic.inline.hpp" 41#include "runtime/orderAccess.inline.hpp" 42#include "runtime/sharedRuntime.hpp" 43#include "runtime/sweeper.hpp" 44#include "utilities/resourceHash.hpp" 45#include "utilities/dtrace.hpp" 46#include "utilities/events.hpp" 47#include "utilities/xmlstream.hpp" 48#ifdef SHARK 49#include "shark/sharkCompiler.hpp" 50#endif 51 52PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC 53 54unsigned char nmethod::_global_unloading_clock = 0; 55 56#ifdef DTRACE_ENABLED 57 58// Only bother with this argument setup if dtrace is available 59 60#define DTRACE_METHOD_UNLOAD_PROBE(method) \ 61 { \ 62 Method* m = (method); \ 63 if (m != NULL) { \ 64 Symbol* klass_name = m->klass_name(); \ 65 Symbol* name = m->name(); \ 66 Symbol* signature = m->signature(); \ 67 HOTSPOT_COMPILED_METHOD_UNLOAD( \ 68 (char *) klass_name->bytes(), klass_name->utf8_length(), \ 69 (char *) name->bytes(), name->utf8_length(), \ 70 (char *) signature->bytes(), signature->utf8_length()); \ 71 } \ 72 } 73 74#else // ndef DTRACE_ENABLED 75 76#define DTRACE_METHOD_UNLOAD_PROBE(method) 77 78#endif 79 80bool nmethod::is_compiled_by_c1() const { 81 if (compiler() == NULL) { 82 return false; 83 } 84 return compiler()->is_c1(); 85} 86bool nmethod::is_compiled_by_c2() const { 87 if (compiler() == NULL) { 88 return false; 89 } 90 return compiler()->is_c2(); 91} 92bool nmethod::is_compiled_by_shark() const { 93 if (compiler() == NULL) { 94 return false; 95 } 96 return compiler()->is_shark(); 97} 98 99 100 101//--------------------------------------------------------------------------------- 102// NMethod statistics 103// They are printed under various flags, including: 104// PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation. 105// (In the latter two cases, they like other stats are printed to the log only.) 106 107#ifndef PRODUCT 108// These variables are put into one block to reduce relocations 109// and make it simpler to print from the debugger. 110static 111struct nmethod_stats_struct { 112 int nmethod_count; 113 int total_size; 114 int relocation_size; 115 int consts_size; 116 int insts_size; 117 int stub_size; 118 int scopes_data_size; 119 int scopes_pcs_size; 120 int dependencies_size; 121 int handler_table_size; 122 int nul_chk_table_size; 123 int oops_size; 124 125 void note_nmethod(nmethod* nm) { 126 nmethod_count += 1; 127 total_size += nm->size(); 128 relocation_size += nm->relocation_size(); 129 consts_size += nm->consts_size(); 130 insts_size += nm->insts_size(); 131 stub_size += nm->stub_size(); 132 oops_size += nm->oops_size(); 133 scopes_data_size += nm->scopes_data_size(); 134 scopes_pcs_size += nm->scopes_pcs_size(); 135 dependencies_size += nm->dependencies_size(); 136 handler_table_size += nm->handler_table_size(); 137 nul_chk_table_size += nm->nul_chk_table_size(); 138 } 139 void print_nmethod_stats() { 140 if (nmethod_count == 0) return; 141 tty->print_cr("Statistics for %d bytecoded nmethods:", nmethod_count); 142 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size); 143 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size); 144 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size); 145 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size); 146 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size); 147 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size); 148 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size); 149 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size); 150 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size); 151 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size); 152 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size); 153 } 154 155 int native_nmethod_count; 156 int native_total_size; 157 int native_relocation_size; 158 int native_insts_size; 159 int native_oops_size; 160 void note_native_nmethod(nmethod* nm) { 161 native_nmethod_count += 1; 162 native_total_size += nm->size(); 163 native_relocation_size += nm->relocation_size(); 164 native_insts_size += nm->insts_size(); 165 native_oops_size += nm->oops_size(); 166 } 167 void print_native_nmethod_stats() { 168 if (native_nmethod_count == 0) return; 169 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count); 170 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size); 171 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size); 172 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size); 173 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size); 174 } 175 176 int pc_desc_resets; // number of resets (= number of caches) 177 int pc_desc_queries; // queries to nmethod::find_pc_desc 178 int pc_desc_approx; // number of those which have approximate true 179 int pc_desc_repeats; // number of _pc_descs[0] hits 180 int pc_desc_hits; // number of LRU cache hits 181 int pc_desc_tests; // total number of PcDesc examinations 182 int pc_desc_searches; // total number of quasi-binary search steps 183 int pc_desc_adds; // number of LUR cache insertions 184 185 void print_pc_stats() { 186 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query", 187 pc_desc_queries, 188 (double)(pc_desc_tests + pc_desc_searches) 189 / pc_desc_queries); 190 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d", 191 pc_desc_resets, 192 pc_desc_queries, pc_desc_approx, 193 pc_desc_repeats, pc_desc_hits, 194 pc_desc_tests, pc_desc_searches, pc_desc_adds); 195 } 196} nmethod_stats; 197#endif //PRODUCT 198 199 200//--------------------------------------------------------------------------------- 201 202 203ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) { 204 assert(pc != NULL, "Must be non null"); 205 assert(exception.not_null(), "Must be non null"); 206 assert(handler != NULL, "Must be non null"); 207 208 _count = 0; 209 _exception_type = exception->klass(); 210 _next = NULL; 211 212 add_address_and_handler(pc,handler); 213} 214 215 216address ExceptionCache::match(Handle exception, address pc) { 217 assert(pc != NULL,"Must be non null"); 218 assert(exception.not_null(),"Must be non null"); 219 if (exception->klass() == exception_type()) { 220 return (test_address(pc)); 221 } 222 223 return NULL; 224} 225 226 227bool ExceptionCache::match_exception_with_space(Handle exception) { 228 assert(exception.not_null(),"Must be non null"); 229 if (exception->klass() == exception_type() && count() < cache_size) { 230 return true; 231 } 232 return false; 233} 234 235 236address ExceptionCache::test_address(address addr) { 237 for (int i=0; i<count(); i++) { 238 if (pc_at(i) == addr) { 239 return handler_at(i); 240 } 241 } 242 return NULL; 243} 244 245 246bool ExceptionCache::add_address_and_handler(address addr, address handler) { 247 if (test_address(addr) == handler) return true; 248 if (count() < cache_size) { 249 set_pc_at(count(),addr); 250 set_handler_at(count(), handler); 251 increment_count(); 252 return true; 253 } 254 return false; 255} 256 257 258// private method for handling exception cache 259// These methods are private, and used to manipulate the exception cache 260// directly. 261ExceptionCache* nmethod::exception_cache_entry_for_exception(Handle exception) { 262 ExceptionCache* ec = exception_cache(); 263 while (ec != NULL) { 264 if (ec->match_exception_with_space(exception)) { 265 return ec; 266 } 267 ec = ec->next(); 268 } 269 return NULL; 270} 271 272 273//----------------------------------------------------------------------------- 274 275 276// Helper used by both find_pc_desc methods. 277static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) { 278 NOT_PRODUCT(++nmethod_stats.pc_desc_tests); 279 if (!approximate) 280 return pc->pc_offset() == pc_offset; 281 else 282 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset(); 283} 284 285void PcDescCache::reset_to(PcDesc* initial_pc_desc) { 286 if (initial_pc_desc == NULL) { 287 _pc_descs[0] = NULL; // native method; no PcDescs at all 288 return; 289 } 290 NOT_PRODUCT(++nmethod_stats.pc_desc_resets); 291 // reset the cache by filling it with benign (non-null) values 292 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel"); 293 for (int i = 0; i < cache_size; i++) 294 _pc_descs[i] = initial_pc_desc; 295} 296 297PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) { 298 NOT_PRODUCT(++nmethod_stats.pc_desc_queries); 299 NOT_PRODUCT(if (approximate) ++nmethod_stats.pc_desc_approx); 300 301 // Note: one might think that caching the most recently 302 // read value separately would be a win, but one would be 303 // wrong. When many threads are updating it, the cache 304 // line it's in would bounce between caches, negating 305 // any benefit. 306 307 // In order to prevent race conditions do not load cache elements 308 // repeatedly, but use a local copy: 309 PcDesc* res; 310 311 // Step one: Check the most recently added value. 312 res = _pc_descs[0]; 313 if (res == NULL) return NULL; // native method; no PcDescs at all 314 if (match_desc(res, pc_offset, approximate)) { 315 NOT_PRODUCT(++nmethod_stats.pc_desc_repeats); 316 return res; 317 } 318 319 // Step two: Check the rest of the LRU cache. 320 for (int i = 1; i < cache_size; ++i) { 321 res = _pc_descs[i]; 322 if (res->pc_offset() < 0) break; // optimization: skip empty cache 323 if (match_desc(res, pc_offset, approximate)) { 324 NOT_PRODUCT(++nmethod_stats.pc_desc_hits); 325 return res; 326 } 327 } 328 329 // Report failure. 330 return NULL; 331} 332 333void PcDescCache::add_pc_desc(PcDesc* pc_desc) { 334 NOT_PRODUCT(++nmethod_stats.pc_desc_adds); 335 // Update the LRU cache by shifting pc_desc forward. 336 for (int i = 0; i < cache_size; i++) { 337 PcDesc* next = _pc_descs[i]; 338 _pc_descs[i] = pc_desc; 339 pc_desc = next; 340 } 341} 342 343// adjust pcs_size so that it is a multiple of both oopSize and 344// sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple 345// of oopSize, then 2*sizeof(PcDesc) is) 346static int adjust_pcs_size(int pcs_size) { 347 int nsize = round_to(pcs_size, oopSize); 348 if ((nsize % sizeof(PcDesc)) != 0) { 349 nsize = pcs_size + sizeof(PcDesc); 350 } 351 assert((nsize % oopSize) == 0, "correct alignment"); 352 return nsize; 353} 354 355//----------------------------------------------------------------------------- 356 357 358void nmethod::add_exception_cache_entry(ExceptionCache* new_entry) { 359 assert(ExceptionCache_lock->owned_by_self(),"Must hold the ExceptionCache_lock"); 360 assert(new_entry != NULL,"Must be non null"); 361 assert(new_entry->next() == NULL, "Must be null"); 362 363 if (exception_cache() != NULL) { 364 new_entry->set_next(exception_cache()); 365 } 366 set_exception_cache(new_entry); 367} 368 369void nmethod::clean_exception_cache(BoolObjectClosure* is_alive) { 370 ExceptionCache* prev = NULL; 371 ExceptionCache* curr = exception_cache(); 372 373 while (curr != NULL) { 374 ExceptionCache* next = curr->next(); 375 376 Klass* ex_klass = curr->exception_type(); 377 if (ex_klass != NULL && !ex_klass->is_loader_alive(is_alive)) { 378 if (prev == NULL) { 379 set_exception_cache(next); 380 } else { 381 prev->set_next(next); 382 } 383 delete curr; 384 // prev stays the same. 385 } else { 386 prev = curr; 387 } 388 389 curr = next; 390 } 391} 392 393// public method for accessing the exception cache 394// These are the public access methods. 395address nmethod::handler_for_exception_and_pc(Handle exception, address pc) { 396 // We never grab a lock to read the exception cache, so we may 397 // have false negatives. This is okay, as it can only happen during 398 // the first few exception lookups for a given nmethod. 399 ExceptionCache* ec = exception_cache(); 400 while (ec != NULL) { 401 address ret_val; 402 if ((ret_val = ec->match(exception,pc)) != NULL) { 403 return ret_val; 404 } 405 ec = ec->next(); 406 } 407 return NULL; 408} 409 410 411void nmethod::add_handler_for_exception_and_pc(Handle exception, address pc, address handler) { 412 // There are potential race conditions during exception cache updates, so we 413 // must own the ExceptionCache_lock before doing ANY modifications. Because 414 // we don't lock during reads, it is possible to have several threads attempt 415 // to update the cache with the same data. We need to check for already inserted 416 // copies of the current data before adding it. 417 418 MutexLocker ml(ExceptionCache_lock); 419 ExceptionCache* target_entry = exception_cache_entry_for_exception(exception); 420 421 if (target_entry == NULL || !target_entry->add_address_and_handler(pc,handler)) { 422 target_entry = new ExceptionCache(exception,pc,handler); 423 add_exception_cache_entry(target_entry); 424 } 425} 426 427 428//-------------end of code for ExceptionCache-------------- 429 430 431int nmethod::total_size() const { 432 return 433 consts_size() + 434 insts_size() + 435 stub_size() + 436 scopes_data_size() + 437 scopes_pcs_size() + 438 handler_table_size() + 439 nul_chk_table_size(); 440} 441 442const char* nmethod::compile_kind() const { 443 if (is_osr_method()) return "osr"; 444 if (method() != NULL && is_native_method()) return "c2n"; 445 return NULL; 446} 447 448// Fill in default values for various flag fields 449void nmethod::init_defaults() { 450 _state = in_use; 451 _unloading_clock = 0; 452 _marked_for_reclamation = 0; 453 _has_flushed_dependencies = 0; 454 _has_unsafe_access = 0; 455 _has_method_handle_invokes = 0; 456 _lazy_critical_native = 0; 457 _has_wide_vectors = 0; 458 _marked_for_deoptimization = 0; 459 _lock_count = 0; 460 _stack_traversal_mark = 0; 461 _unload_reported = false; // jvmti state 462 463#ifdef ASSERT 464 _oops_are_stale = false; 465#endif 466 467 _oops_do_mark_link = NULL; 468 _jmethod_id = NULL; 469 _osr_link = NULL; 470 if (UseG1GC) { 471 _unloading_next = NULL; 472 } else { 473 _scavenge_root_link = NULL; 474 } 475 _scavenge_root_state = 0; 476 _compiler = NULL; 477#if INCLUDE_RTM_OPT 478 _rtm_state = NoRTM; 479#endif 480} 481 482nmethod* nmethod::new_native_nmethod(methodHandle method, 483 int compile_id, 484 CodeBuffer *code_buffer, 485 int vep_offset, 486 int frame_complete, 487 int frame_size, 488 ByteSize basic_lock_owner_sp_offset, 489 ByteSize basic_lock_sp_offset, 490 OopMapSet* oop_maps) { 491 code_buffer->finalize_oop_references(method); 492 // create nmethod 493 nmethod* nm = NULL; 494 { 495 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 496 int native_nmethod_size = allocation_size(code_buffer, sizeof(nmethod)); 497 CodeOffsets offsets; 498 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset); 499 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete); 500 nm = new (native_nmethod_size, CompLevel_none) nmethod(method(), native_nmethod_size, 501 compile_id, &offsets, 502 code_buffer, frame_size, 503 basic_lock_owner_sp_offset, 504 basic_lock_sp_offset, oop_maps); 505 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_native_nmethod(nm)); 506 if (PrintAssembly && nm != NULL) { 507 Disassembler::decode(nm); 508 } 509 } 510 // verify nmethod 511 debug_only(if (nm) nm->verify();) // might block 512 513 if (nm != NULL) { 514 nm->log_new_nmethod(); 515 } 516 517 return nm; 518} 519 520nmethod* nmethod::new_nmethod(methodHandle method, 521 int compile_id, 522 int entry_bci, 523 CodeOffsets* offsets, 524 int orig_pc_offset, 525 DebugInformationRecorder* debug_info, 526 Dependencies* dependencies, 527 CodeBuffer* code_buffer, int frame_size, 528 OopMapSet* oop_maps, 529 ExceptionHandlerTable* handler_table, 530 ImplicitExceptionTable* nul_chk_table, 531 AbstractCompiler* compiler, 532 int comp_level 533) 534{ 535 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); 536 code_buffer->finalize_oop_references(method); 537 // create nmethod 538 nmethod* nm = NULL; 539 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 540 int nmethod_size = 541 allocation_size(code_buffer, sizeof(nmethod)) 542 + adjust_pcs_size(debug_info->pcs_size()) 543 + round_to(dependencies->size_in_bytes() , oopSize) 544 + round_to(handler_table->size_in_bytes(), oopSize) 545 + round_to(nul_chk_table->size_in_bytes(), oopSize) 546 + round_to(debug_info->data_size() , oopSize); 547 548 nm = new (nmethod_size, comp_level) 549 nmethod(method(), nmethod_size, compile_id, entry_bci, offsets, 550 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size, 551 oop_maps, 552 handler_table, 553 nul_chk_table, 554 compiler, 555 comp_level); 556 557 if (nm != NULL) { 558 // To make dependency checking during class loading fast, record 559 // the nmethod dependencies in the classes it is dependent on. 560 // This allows the dependency checking code to simply walk the 561 // class hierarchy above the loaded class, checking only nmethods 562 // which are dependent on those classes. The slow way is to 563 // check every nmethod for dependencies which makes it linear in 564 // the number of methods compiled. For applications with a lot 565 // classes the slow way is too slow. 566 for (Dependencies::DepStream deps(nm); deps.next(); ) { 567 Klass* klass = deps.context_type(); 568 if (klass == NULL) { 569 continue; // ignore things like evol_method 570 } 571 572 // record this nmethod as dependent on this klass 573 InstanceKlass::cast(klass)->add_dependent_nmethod(nm); 574 } 575 NOT_PRODUCT(nmethod_stats.note_nmethod(nm)); 576 if (PrintAssembly || CompilerOracle::has_option_string(method, "PrintAssembly")) { 577 Disassembler::decode(nm); 578 } 579 } 580 } 581 // Do verification and logging outside CodeCache_lock. 582 if (nm != NULL) { 583 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet. 584 DEBUG_ONLY(nm->verify();) 585 nm->log_new_nmethod(); 586 } 587 return nm; 588} 589 590 591// For native wrappers 592nmethod::nmethod( 593 Method* method, 594 int nmethod_size, 595 int compile_id, 596 CodeOffsets* offsets, 597 CodeBuffer* code_buffer, 598 int frame_size, 599 ByteSize basic_lock_owner_sp_offset, 600 ByteSize basic_lock_sp_offset, 601 OopMapSet* oop_maps ) 602 : CodeBlob("native nmethod", code_buffer, sizeof(nmethod), 603 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps), 604 _native_receiver_sp_offset(basic_lock_owner_sp_offset), 605 _native_basic_lock_sp_offset(basic_lock_sp_offset) 606{ 607 { 608 debug_only(No_Safepoint_Verifier nsv;) 609 assert_locked_or_safepoint(CodeCache_lock); 610 611 init_defaults(); 612 _method = method; 613 _entry_bci = InvocationEntryBci; 614 // We have no exception handler or deopt handler make the 615 // values something that will never match a pc like the nmethod vtable entry 616 _exception_offset = 0; 617 _deoptimize_offset = 0; 618 _deoptimize_mh_offset = 0; 619 _orig_pc_offset = 0; 620 621 _consts_offset = data_offset(); 622 _stub_offset = data_offset(); 623 _oops_offset = data_offset(); 624 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize); 625 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize); 626 _scopes_pcs_offset = _scopes_data_offset; 627 _dependencies_offset = _scopes_pcs_offset; 628 _handler_table_offset = _dependencies_offset; 629 _nul_chk_table_offset = _handler_table_offset; 630 _nmethod_end_offset = _nul_chk_table_offset; 631 _compile_id = compile_id; 632 _comp_level = CompLevel_none; 633 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 634 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 635 _osr_entry_point = NULL; 636 _exception_cache = NULL; 637 _pc_desc_cache.reset_to(NULL); 638 _hotness_counter = NMethodSweeper::hotness_counter_reset_val(); 639 640 code_buffer->copy_values_to(this); 641 if (ScavengeRootsInCode) { 642 if (detect_scavenge_root_oops()) { 643 CodeCache::add_scavenge_root_nmethod(this); 644 } 645 Universe::heap()->register_nmethod(this); 646 } 647 debug_only(verify_scavenge_root_oops()); 648 CodeCache::commit(this); 649 } 650 651 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) { 652 ttyLocker ttyl; // keep the following output all in one block 653 // This output goes directly to the tty, not the compiler log. 654 // To enable tools to match it up with the compilation activity, 655 // be sure to tag this tty output with the compile ID. 656 if (xtty != NULL) { 657 xtty->begin_head("print_native_nmethod"); 658 xtty->method(_method); 659 xtty->stamp(); 660 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this); 661 } 662 // print the header part first 663 print(); 664 // then print the requested information 665 if (PrintNativeNMethods) { 666 print_code(); 667 if (oop_maps != NULL) { 668 oop_maps->print(); 669 } 670 } 671 if (PrintRelocations) { 672 print_relocations(); 673 } 674 if (xtty != NULL) { 675 xtty->tail("print_native_nmethod"); 676 } 677 } 678} 679 680void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () { 681 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level)); 682} 683 684nmethod::nmethod( 685 Method* method, 686 int nmethod_size, 687 int compile_id, 688 int entry_bci, 689 CodeOffsets* offsets, 690 int orig_pc_offset, 691 DebugInformationRecorder* debug_info, 692 Dependencies* dependencies, 693 CodeBuffer *code_buffer, 694 int frame_size, 695 OopMapSet* oop_maps, 696 ExceptionHandlerTable* handler_table, 697 ImplicitExceptionTable* nul_chk_table, 698 AbstractCompiler* compiler, 699 int comp_level 700 ) 701 : CodeBlob("nmethod", code_buffer, sizeof(nmethod), 702 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps), 703 _native_receiver_sp_offset(in_ByteSize(-1)), 704 _native_basic_lock_sp_offset(in_ByteSize(-1)) 705{ 706 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); 707 { 708 debug_only(No_Safepoint_Verifier nsv;) 709 assert_locked_or_safepoint(CodeCache_lock); 710 711 init_defaults(); 712 _method = method; 713 _entry_bci = entry_bci; 714 _compile_id = compile_id; 715 _comp_level = comp_level; 716 _compiler = compiler; 717 _orig_pc_offset = orig_pc_offset; 718 _hotness_counter = NMethodSweeper::hotness_counter_reset_val(); 719 720 // Section offsets 721 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts()); 722 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs()); 723 724 // Exception handler and deopt handler are in the stub section 725 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set"); 726 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set"); 727 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions); 728 _deoptimize_offset = _stub_offset + offsets->value(CodeOffsets::Deopt); 729 if (offsets->value(CodeOffsets::DeoptMH) != -1) { 730 _deoptimize_mh_offset = _stub_offset + offsets->value(CodeOffsets::DeoptMH); 731 } else { 732 _deoptimize_mh_offset = -1; 733 } 734 if (offsets->value(CodeOffsets::UnwindHandler) != -1) { 735 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler); 736 } else { 737 _unwind_handler_offset = -1; 738 } 739 740 _oops_offset = data_offset(); 741 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize); 742 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize); 743 744 _scopes_pcs_offset = _scopes_data_offset + round_to(debug_info->data_size (), oopSize); 745 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size()); 746 _handler_table_offset = _dependencies_offset + round_to(dependencies->size_in_bytes (), oopSize); 747 _nul_chk_table_offset = _handler_table_offset + round_to(handler_table->size_in_bytes(), oopSize); 748 _nmethod_end_offset = _nul_chk_table_offset + round_to(nul_chk_table->size_in_bytes(), oopSize); 749 750 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 751 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 752 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry); 753 _exception_cache = NULL; 754 _pc_desc_cache.reset_to(scopes_pcs_begin()); 755 756 // Copy contents of ScopeDescRecorder to nmethod 757 code_buffer->copy_values_to(this); 758 debug_info->copy_to(this); 759 dependencies->copy_to(this); 760 if (ScavengeRootsInCode) { 761 if (detect_scavenge_root_oops()) { 762 CodeCache::add_scavenge_root_nmethod(this); 763 } 764 Universe::heap()->register_nmethod(this); 765 } 766 debug_only(verify_scavenge_root_oops()); 767 768 CodeCache::commit(this); 769 770 // Copy contents of ExceptionHandlerTable to nmethod 771 handler_table->copy_to(this); 772 nul_chk_table->copy_to(this); 773 774 // we use the information of entry points to find out if a method is 775 // static or non static 776 assert(compiler->is_c2() || 777 _method->is_static() == (entry_point() == _verified_entry_point), 778 " entry points must be same for static methods and vice versa"); 779 } 780 781 bool printnmethods = PrintNMethods 782 || CompilerOracle::should_print(_method) 783 || CompilerOracle::has_option_string(_method, "PrintNMethods"); 784 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) { 785 print_nmethod(printnmethods); 786 } 787} 788 789 790// Print a short set of xml attributes to identify this nmethod. The 791// output should be embedded in some other element. 792void nmethod::log_identity(xmlStream* log) const { 793 log->print(" compile_id='%d'", compile_id()); 794 const char* nm_kind = compile_kind(); 795 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind); 796 if (compiler() != NULL) { 797 log->print(" compiler='%s'", compiler()->name()); 798 } 799 if (TieredCompilation) { 800 log->print(" level='%d'", comp_level()); 801 } 802} 803 804 805#define LOG_OFFSET(log, name) \ 806 if ((intptr_t)name##_end() - (intptr_t)name##_begin()) \ 807 log->print(" " XSTR(name) "_offset='%d'" , \ 808 (intptr_t)name##_begin() - (intptr_t)this) 809 810 811void nmethod::log_new_nmethod() const { 812 if (LogCompilation && xtty != NULL) { 813 ttyLocker ttyl; 814 HandleMark hm; 815 xtty->begin_elem("nmethod"); 816 log_identity(xtty); 817 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", code_begin(), size()); 818 xtty->print(" address='" INTPTR_FORMAT "'", (intptr_t) this); 819 820 LOG_OFFSET(xtty, relocation); 821 LOG_OFFSET(xtty, consts); 822 LOG_OFFSET(xtty, insts); 823 LOG_OFFSET(xtty, stub); 824 LOG_OFFSET(xtty, scopes_data); 825 LOG_OFFSET(xtty, scopes_pcs); 826 LOG_OFFSET(xtty, dependencies); 827 LOG_OFFSET(xtty, handler_table); 828 LOG_OFFSET(xtty, nul_chk_table); 829 LOG_OFFSET(xtty, oops); 830 831 xtty->method(method()); 832 xtty->stamp(); 833 xtty->end_elem(); 834 } 835} 836 837#undef LOG_OFFSET 838 839 840// Print out more verbose output usually for a newly created nmethod. 841void nmethod::print_on(outputStream* st, const char* msg) const { 842 if (st != NULL) { 843 ttyLocker ttyl; 844 if (WizardMode) { 845 CompileTask::print_compilation(st, this, msg, /*short_form:*/ true); 846 st->print_cr(" (" INTPTR_FORMAT ")", this); 847 } else { 848 CompileTask::print_compilation(st, this, msg, /*short_form:*/ false); 849 } 850 } 851} 852 853 854void nmethod::print_nmethod(bool printmethod) { 855 ttyLocker ttyl; // keep the following output all in one block 856 if (xtty != NULL) { 857 xtty->begin_head("print_nmethod"); 858 xtty->stamp(); 859 xtty->end_head(); 860 } 861 // print the header part first 862 print(); 863 // then print the requested information 864 if (printmethod) { 865 print_code(); 866 print_pcs(); 867 if (oop_maps()) { 868 oop_maps()->print(); 869 } 870 } 871 if (PrintDebugInfo) { 872 print_scopes(); 873 } 874 if (PrintRelocations) { 875 print_relocations(); 876 } 877 if (PrintDependencies) { 878 print_dependencies(); 879 } 880 if (PrintExceptionHandlers) { 881 print_handler_table(); 882 print_nul_chk_table(); 883 } 884 if (xtty != NULL) { 885 xtty->tail("print_nmethod"); 886 } 887} 888 889 890// Promote one word from an assembly-time handle to a live embedded oop. 891inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) { 892 if (handle == NULL || 893 // As a special case, IC oops are initialized to 1 or -1. 894 handle == (jobject) Universe::non_oop_word()) { 895 (*dest) = (oop) handle; 896 } else { 897 (*dest) = JNIHandles::resolve_non_null(handle); 898 } 899} 900 901 902// Have to have the same name because it's called by a template 903void nmethod::copy_values(GrowableArray<jobject>* array) { 904 int length = array->length(); 905 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough"); 906 oop* dest = oops_begin(); 907 for (int index = 0 ; index < length; index++) { 908 initialize_immediate_oop(&dest[index], array->at(index)); 909 } 910 911 // Now we can fix up all the oops in the code. We need to do this 912 // in the code because the assembler uses jobjects as placeholders. 913 // The code and relocations have already been initialized by the 914 // CodeBlob constructor, so it is valid even at this early point to 915 // iterate over relocations and patch the code. 916 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true); 917} 918 919void nmethod::copy_values(GrowableArray<Metadata*>* array) { 920 int length = array->length(); 921 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough"); 922 Metadata** dest = metadata_begin(); 923 for (int index = 0 ; index < length; index++) { 924 dest[index] = array->at(index); 925 } 926} 927 928bool nmethod::is_at_poll_return(address pc) { 929 RelocIterator iter(this, pc, pc+1); 930 while (iter.next()) { 931 if (iter.type() == relocInfo::poll_return_type) 932 return true; 933 } 934 return false; 935} 936 937 938bool nmethod::is_at_poll_or_poll_return(address pc) { 939 RelocIterator iter(this, pc, pc+1); 940 while (iter.next()) { 941 relocInfo::relocType t = iter.type(); 942 if (t == relocInfo::poll_return_type || t == relocInfo::poll_type) 943 return true; 944 } 945 return false; 946} 947 948 949void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) { 950 // re-patch all oop-bearing instructions, just in case some oops moved 951 RelocIterator iter(this, begin, end); 952 while (iter.next()) { 953 if (iter.type() == relocInfo::oop_type) { 954 oop_Relocation* reloc = iter.oop_reloc(); 955 if (initialize_immediates && reloc->oop_is_immediate()) { 956 oop* dest = reloc->oop_addr(); 957 initialize_immediate_oop(dest, (jobject) *dest); 958 } 959 // Refresh the oop-related bits of this instruction. 960 reloc->fix_oop_relocation(); 961 } else if (iter.type() == relocInfo::metadata_type) { 962 metadata_Relocation* reloc = iter.metadata_reloc(); 963 reloc->fix_metadata_relocation(); 964 } 965 } 966} 967 968 969void nmethod::verify_oop_relocations() { 970 // Ensure sure that the code matches the current oop values 971 RelocIterator iter(this, NULL, NULL); 972 while (iter.next()) { 973 if (iter.type() == relocInfo::oop_type) { 974 oop_Relocation* reloc = iter.oop_reloc(); 975 if (!reloc->oop_is_immediate()) { 976 reloc->verify_oop_relocation(); 977 } 978 } 979 } 980} 981 982 983ScopeDesc* nmethod::scope_desc_at(address pc) { 984 PcDesc* pd = pc_desc_at(pc); 985 guarantee(pd != NULL, "scope must be present"); 986 return new ScopeDesc(this, pd->scope_decode_offset(), 987 pd->obj_decode_offset(), pd->should_reexecute(), 988 pd->return_oop()); 989} 990 991 992void nmethod::clear_inline_caches() { 993 assert(SafepointSynchronize::is_at_safepoint(), "cleaning of IC's only allowed at safepoint"); 994 if (is_zombie()) { 995 return; 996 } 997 998 RelocIterator iter(this); 999 while (iter.next()) { 1000 iter.reloc()->clear_inline_cache(); 1001 } 1002} 1003 1004// Clear ICStubs of all compiled ICs 1005void nmethod::clear_ic_stubs() { 1006 assert_locked_or_safepoint(CompiledIC_lock); 1007 RelocIterator iter(this); 1008 while(iter.next()) { 1009 if (iter.type() == relocInfo::virtual_call_type) { 1010 CompiledIC* ic = CompiledIC_at(&iter); 1011 ic->clear_ic_stub(); 1012 } 1013 } 1014} 1015 1016 1017void nmethod::cleanup_inline_caches() { 1018 1019 assert_locked_or_safepoint(CompiledIC_lock); 1020 1021 // If the method is not entrant or zombie then a JMP is plastered over the 1022 // first few bytes. If an oop in the old code was there, that oop 1023 // should not get GC'd. Skip the first few bytes of oops on 1024 // not-entrant methods. 1025 address low_boundary = verified_entry_point(); 1026 if (!is_in_use()) { 1027 low_boundary += NativeJump::instruction_size; 1028 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1029 // This means that the low_boundary is going to be a little too high. 1030 // This shouldn't matter, since oops of non-entrant methods are never used. 1031 // In fact, why are we bothering to look at oops in a non-entrant method?? 1032 } 1033 1034 // Find all calls in an nmethod, and clear the ones that points to zombie methods 1035 ResourceMark rm; 1036 RelocIterator iter(this, low_boundary); 1037 while(iter.next()) { 1038 switch(iter.type()) { 1039 case relocInfo::virtual_call_type: 1040 case relocInfo::opt_virtual_call_type: { 1041 CompiledIC *ic = CompiledIC_at(&iter); 1042 // Ok, to lookup references to zombies here 1043 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination()); 1044 if( cb != NULL && cb->is_nmethod() ) { 1045 nmethod* nm = (nmethod*)cb; 1046 // Clean inline caches pointing to both zombie and not_entrant methods 1047 if (!nm->is_in_use() || (nm->method()->code() != nm)) ic->set_to_clean(); 1048 } 1049 break; 1050 } 1051 case relocInfo::static_call_type: { 1052 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc()); 1053 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination()); 1054 if( cb != NULL && cb->is_nmethod() ) { 1055 nmethod* nm = (nmethod*)cb; 1056 // Clean inline caches pointing to both zombie and not_entrant methods 1057 if (!nm->is_in_use() || (nm->method()->code() != nm)) csc->set_to_clean(); 1058 } 1059 break; 1060 } 1061 } 1062 } 1063} 1064 1065void nmethod::verify_clean_inline_caches() { 1066 assert_locked_or_safepoint(CompiledIC_lock); 1067 1068 // If the method is not entrant or zombie then a JMP is plastered over the 1069 // first few bytes. If an oop in the old code was there, that oop 1070 // should not get GC'd. Skip the first few bytes of oops on 1071 // not-entrant methods. 1072 address low_boundary = verified_entry_point(); 1073 if (!is_in_use()) { 1074 low_boundary += NativeJump::instruction_size; 1075 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1076 // This means that the low_boundary is going to be a little too high. 1077 // This shouldn't matter, since oops of non-entrant methods are never used. 1078 // In fact, why are we bothering to look at oops in a non-entrant method?? 1079 } 1080 1081 ResourceMark rm; 1082 RelocIterator iter(this, low_boundary); 1083 while(iter.next()) { 1084 switch(iter.type()) { 1085 case relocInfo::virtual_call_type: 1086 case relocInfo::opt_virtual_call_type: { 1087 CompiledIC *ic = CompiledIC_at(&iter); 1088 // Ok, to lookup references to zombies here 1089 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination()); 1090 if( cb != NULL && cb->is_nmethod() ) { 1091 nmethod* nm = (nmethod*)cb; 1092 // Verify that inline caches pointing to both zombie and not_entrant methods are clean 1093 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 1094 assert(ic->is_clean(), "IC should be clean"); 1095 } 1096 } 1097 break; 1098 } 1099 case relocInfo::static_call_type: { 1100 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc()); 1101 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination()); 1102 if( cb != NULL && cb->is_nmethod() ) { 1103 nmethod* nm = (nmethod*)cb; 1104 // Verify that inline caches pointing to both zombie and not_entrant methods are clean 1105 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 1106 assert(csc->is_clean(), "IC should be clean"); 1107 } 1108 } 1109 break; 1110 } 1111 } 1112 } 1113} 1114 1115int nmethod::verify_icholder_relocations() { 1116 int count = 0; 1117 1118 RelocIterator iter(this); 1119 while(iter.next()) { 1120 if (iter.type() == relocInfo::virtual_call_type) { 1121 if (CompiledIC::is_icholder_call_site(iter.virtual_call_reloc())) { 1122 CompiledIC *ic = CompiledIC_at(&iter); 1123 if (TraceCompiledIC) { 1124 tty->print("noticed icholder " INTPTR_FORMAT " ", p2i(ic->cached_icholder())); 1125 ic->print(); 1126 } 1127 assert(ic->cached_icholder() != NULL, "must be non-NULL"); 1128 count++; 1129 } 1130 } 1131 } 1132 1133 return count; 1134} 1135 1136// This is a private interface with the sweeper. 1137void nmethod::mark_as_seen_on_stack() { 1138 assert(is_alive(), "Must be an alive method"); 1139 // Set the traversal mark to ensure that the sweeper does 2 1140 // cleaning passes before moving to zombie. 1141 set_stack_traversal_mark(NMethodSweeper::traversal_count()); 1142} 1143 1144// Tell if a non-entrant method can be converted to a zombie (i.e., 1145// there are no activations on the stack, not in use by the VM, 1146// and not in use by the ServiceThread) 1147bool nmethod::can_not_entrant_be_converted() { 1148 assert(is_not_entrant(), "must be a non-entrant method"); 1149 1150 // Since the nmethod sweeper only does partial sweep the sweeper's traversal 1151 // count can be greater than the stack traversal count before it hits the 1152 // nmethod for the second time. 1153 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count() && 1154 !is_locked_by_vm(); 1155} 1156 1157void nmethod::inc_decompile_count() { 1158 if (!is_compiled_by_c2()) return; 1159 // Could be gated by ProfileTraps, but do not bother... 1160 Method* m = method(); 1161 if (m == NULL) return; 1162 MethodData* mdo = m->method_data(); 1163 if (mdo == NULL) return; 1164 // There is a benign race here. See comments in methodData.hpp. 1165 mdo->inc_decompile_count(); 1166} 1167 1168void nmethod::increase_unloading_clock() { 1169 _global_unloading_clock++; 1170 if (_global_unloading_clock == 0) { 1171 // _nmethods are allocated with _unloading_clock == 0, 1172 // so 0 is never used as a clock value. 1173 _global_unloading_clock = 1; 1174 } 1175} 1176 1177void nmethod::set_unloading_clock(unsigned char unloading_clock) { 1178 OrderAccess::release_store((volatile jubyte*)&_unloading_clock, unloading_clock); 1179} 1180 1181unsigned char nmethod::unloading_clock() { 1182 return (unsigned char)OrderAccess::load_acquire((volatile jubyte*)&_unloading_clock); 1183} 1184 1185void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) { 1186 1187 post_compiled_method_unload(); 1188 1189 // Since this nmethod is being unloaded, make sure that dependencies 1190 // recorded in instanceKlasses get flushed and pass non-NULL closure to 1191 // indicate that this work is being done during a GC. 1192 assert(Universe::heap()->is_gc_active(), "should only be called during gc"); 1193 assert(is_alive != NULL, "Should be non-NULL"); 1194 // A non-NULL is_alive closure indicates that this is being called during GC. 1195 flush_dependencies(is_alive); 1196 1197 // Break cycle between nmethod & method 1198 if (TraceClassUnloading && WizardMode) { 1199 tty->print_cr("[Class unloading: Making nmethod " INTPTR_FORMAT 1200 " unloadable], Method*(" INTPTR_FORMAT 1201 "), cause(" INTPTR_FORMAT ")", 1202 this, (address)_method, (address)cause); 1203 if (!Universe::heap()->is_gc_active()) 1204 cause->klass()->print(); 1205 } 1206 // Unlink the osr method, so we do not look this up again 1207 if (is_osr_method()) { 1208 invalidate_osr_method(); 1209 } 1210 // If _method is already NULL the Method* is about to be unloaded, 1211 // so we don't have to break the cycle. Note that it is possible to 1212 // have the Method* live here, in case we unload the nmethod because 1213 // it is pointing to some oop (other than the Method*) being unloaded. 1214 if (_method != NULL) { 1215 // OSR methods point to the Method*, but the Method* does not 1216 // point back! 1217 if (_method->code() == this) { 1218 _method->clear_code(); // Break a cycle 1219 } 1220 _method = NULL; // Clear the method of this dead nmethod 1221 } 1222 // Make the class unloaded - i.e., change state and notify sweeper 1223 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); 1224 if (is_in_use()) { 1225 // Transitioning directly from live to unloaded -- so 1226 // we need to force a cache clean-up; remember this 1227 // for later on. 1228 CodeCache::set_needs_cache_clean(true); 1229 } 1230 1231 // Unregister must be done before the state change 1232 Universe::heap()->unregister_nmethod(this); 1233 1234 _state = unloaded; 1235 1236 // Log the unloading. 1237 log_state_change(); 1238 1239 // The Method* is gone at this point 1240 assert(_method == NULL, "Tautology"); 1241 1242 set_osr_link(NULL); 1243 //set_scavenge_root_link(NULL); // done by prune_scavenge_root_nmethods 1244 NMethodSweeper::report_state_change(this); 1245} 1246 1247void nmethod::invalidate_osr_method() { 1248 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); 1249 // Remove from list of active nmethods 1250 if (method() != NULL) 1251 method()->method_holder()->remove_osr_nmethod(this); 1252} 1253 1254void nmethod::log_state_change() const { 1255 if (LogCompilation) { 1256 if (xtty != NULL) { 1257 ttyLocker ttyl; // keep the following output all in one block 1258 if (_state == unloaded) { 1259 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'", 1260 os::current_thread_id()); 1261 } else { 1262 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s", 1263 os::current_thread_id(), 1264 (_state == zombie ? " zombie='1'" : "")); 1265 } 1266 log_identity(xtty); 1267 xtty->stamp(); 1268 xtty->end_elem(); 1269 } 1270 } 1271 if (PrintCompilation && _state != unloaded) { 1272 print_on(tty, _state == zombie ? "made zombie" : "made not entrant"); 1273 } 1274} 1275 1276/** 1277 * Common functionality for both make_not_entrant and make_zombie 1278 */ 1279bool nmethod::make_not_entrant_or_zombie(unsigned int state) { 1280 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant"); 1281 assert(!is_zombie(), "should not already be a zombie"); 1282 1283 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below. 1284 nmethodLocker nml(this); 1285 methodHandle the_method(method()); 1286 No_Safepoint_Verifier nsv; 1287 1288 // during patching, depending on the nmethod state we must notify the GC that 1289 // code has been unloaded, unregistering it. We cannot do this right while 1290 // holding the Patching_lock because we need to use the CodeCache_lock. This 1291 // would be prone to deadlocks. 1292 // This flag is used to remember whether we need to later lock and unregister. 1293 bool nmethod_needs_unregister = false; 1294 1295 { 1296 // invalidate osr nmethod before acquiring the patching lock since 1297 // they both acquire leaf locks and we don't want a deadlock. 1298 // This logic is equivalent to the logic below for patching the 1299 // verified entry point of regular methods. 1300 if (is_osr_method()) { 1301 // this effectively makes the osr nmethod not entrant 1302 invalidate_osr_method(); 1303 } 1304 1305 // Enter critical section. Does not block for safepoint. 1306 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 1307 1308 if (_state == state) { 1309 // another thread already performed this transition so nothing 1310 // to do, but return false to indicate this. 1311 return false; 1312 } 1313 1314 // The caller can be calling the method statically or through an inline 1315 // cache call. 1316 if (!is_osr_method() && !is_not_entrant()) { 1317 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(), 1318 SharedRuntime::get_handle_wrong_method_stub()); 1319 } 1320 1321 if (is_in_use()) { 1322 // It's a true state change, so mark the method as decompiled. 1323 // Do it only for transition from alive. 1324 inc_decompile_count(); 1325 } 1326 1327 // If the state is becoming a zombie, signal to unregister the nmethod with 1328 // the heap. 1329 // This nmethod may have already been unloaded during a full GC. 1330 if ((state == zombie) && !is_unloaded()) { 1331 nmethod_needs_unregister = true; 1332 } 1333 1334 // Must happen before state change. Otherwise we have a race condition in 1335 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately 1336 // transition its state from 'not_entrant' to 'zombie' without having to wait 1337 // for stack scanning. 1338 if (state == not_entrant) { 1339 mark_as_seen_on_stack(); 1340 OrderAccess::storestore(); 1341 } 1342 1343 // Change state 1344 _state = state; 1345 1346 // Log the transition once 1347 log_state_change(); 1348 1349 // Remove nmethod from method. 1350 // We need to check if both the _code and _from_compiled_code_entry_point 1351 // refer to this nmethod because there is a race in setting these two fields 1352 // in Method* as seen in bugid 4947125. 1353 // If the vep() points to the zombie nmethod, the memory for the nmethod 1354 // could be flushed and the compiler and vtable stubs could still call 1355 // through it. 1356 if (method() != NULL && (method()->code() == this || 1357 method()->from_compiled_entry() == verified_entry_point())) { 1358 HandleMark hm; 1359 method()->clear_code(); 1360 } 1361 } // leave critical region under Patching_lock 1362 1363 // When the nmethod becomes zombie it is no longer alive so the 1364 // dependencies must be flushed. nmethods in the not_entrant 1365 // state will be flushed later when the transition to zombie 1366 // happens or they get unloaded. 1367 if (state == zombie) { 1368 { 1369 // Flushing dependecies must be done before any possible 1370 // safepoint can sneak in, otherwise the oops used by the 1371 // dependency logic could have become stale. 1372 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1373 if (nmethod_needs_unregister) { 1374 Universe::heap()->unregister_nmethod(this); 1375 } 1376 flush_dependencies(NULL); 1377 } 1378 1379 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload 1380 // event and it hasn't already been reported for this nmethod then 1381 // report it now. The event may have been reported earilier if the GC 1382 // marked it for unloading). JvmtiDeferredEventQueue support means 1383 // we no longer go to a safepoint here. 1384 post_compiled_method_unload(); 1385 1386#ifdef ASSERT 1387 // It's no longer safe to access the oops section since zombie 1388 // nmethods aren't scanned for GC. 1389 _oops_are_stale = true; 1390#endif 1391 // the Method may be reclaimed by class unloading now that the 1392 // nmethod is in zombie state 1393 set_method(NULL); 1394 } else { 1395 assert(state == not_entrant, "other cases may need to be handled differently"); 1396 } 1397 1398 if (TraceCreateZombies) { 1399 tty->print_cr("nmethod <" INTPTR_FORMAT "> code made %s", this, (state == not_entrant) ? "not entrant" : "zombie"); 1400 } 1401 1402 NMethodSweeper::report_state_change(this); 1403 return true; 1404} 1405 1406void nmethod::flush() { 1407 // Note that there are no valid oops in the nmethod anymore. 1408 assert(is_zombie() || (is_osr_method() && is_unloaded()), "must be a zombie method"); 1409 assert(is_marked_for_reclamation() || (is_osr_method() && is_unloaded()), "must be marked for reclamation"); 1410 1411 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed"); 1412 assert_locked_or_safepoint(CodeCache_lock); 1413 1414 // completely deallocate this method 1415 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, this); 1416 if (PrintMethodFlushing) { 1417 tty->print_cr("*flushing nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT "/Free CodeCache:" SIZE_FORMAT "Kb", 1418 _compile_id, this, CodeCache::nof_blobs(), CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(_comp_level))/1024); 1419 } 1420 1421 // We need to deallocate any ExceptionCache data. 1422 // Note that we do not need to grab the nmethod lock for this, it 1423 // better be thread safe if we're disposing of it! 1424 ExceptionCache* ec = exception_cache(); 1425 set_exception_cache(NULL); 1426 while(ec != NULL) { 1427 ExceptionCache* next = ec->next(); 1428 delete ec; 1429 ec = next; 1430 } 1431 1432 if (on_scavenge_root_list()) { 1433 CodeCache::drop_scavenge_root_nmethod(this); 1434 } 1435 1436#ifdef SHARK 1437 ((SharkCompiler *) compiler())->free_compiled_method(insts_begin()); 1438#endif // SHARK 1439 1440 ((CodeBlob*)(this))->flush(); 1441 1442 CodeCache::free(this); 1443} 1444 1445// 1446// Notify all classes this nmethod is dependent on that it is no 1447// longer dependent. This should only be called in two situations. 1448// First, when a nmethod transitions to a zombie all dependents need 1449// to be clear. Since zombification happens at a safepoint there's no 1450// synchronization issues. The second place is a little more tricky. 1451// During phase 1 of mark sweep class unloading may happen and as a 1452// result some nmethods may get unloaded. In this case the flushing 1453// of dependencies must happen during phase 1 since after GC any 1454// dependencies in the unloaded nmethod won't be updated, so 1455// traversing the dependency information in unsafe. In that case this 1456// function is called with a non-NULL argument and this function only 1457// notifies instanceKlasses that are reachable 1458 1459void nmethod::flush_dependencies(BoolObjectClosure* is_alive) { 1460 assert_locked_or_safepoint(CodeCache_lock); 1461 assert(Universe::heap()->is_gc_active() == (is_alive != NULL), 1462 "is_alive is non-NULL if and only if we are called during GC"); 1463 if (!has_flushed_dependencies()) { 1464 set_has_flushed_dependencies(); 1465 for (Dependencies::DepStream deps(this); deps.next(); ) { 1466 Klass* klass = deps.context_type(); 1467 if (klass == NULL) continue; // ignore things like evol_method 1468 1469 // During GC the is_alive closure is non-NULL, and is used to 1470 // determine liveness of dependees that need to be updated. 1471 if (is_alive == NULL || klass->is_loader_alive(is_alive)) { 1472 InstanceKlass::cast(klass)->remove_dependent_nmethod(this); 1473 } 1474 } 1475 } 1476} 1477 1478 1479// If this oop is not live, the nmethod can be unloaded. 1480bool nmethod::can_unload(BoolObjectClosure* is_alive, oop* root, bool unloading_occurred) { 1481 assert(root != NULL, "just checking"); 1482 oop obj = *root; 1483 if (obj == NULL || is_alive->do_object_b(obj)) { 1484 return false; 1485 } 1486 1487 // If ScavengeRootsInCode is true, an nmethod might be unloaded 1488 // simply because one of its constant oops has gone dead. 1489 // No actual classes need to be unloaded in order for this to occur. 1490 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading"); 1491 make_unloaded(is_alive, obj); 1492 return true; 1493} 1494 1495// ------------------------------------------------------------------ 1496// post_compiled_method_load_event 1497// new method for install_code() path 1498// Transfer information from compilation to jvmti 1499void nmethod::post_compiled_method_load_event() { 1500 1501 Method* moop = method(); 1502 HOTSPOT_COMPILED_METHOD_LOAD( 1503 (char *) moop->klass_name()->bytes(), 1504 moop->klass_name()->utf8_length(), 1505 (char *) moop->name()->bytes(), 1506 moop->name()->utf8_length(), 1507 (char *) moop->signature()->bytes(), 1508 moop->signature()->utf8_length(), 1509 insts_begin(), insts_size()); 1510 1511 if (JvmtiExport::should_post_compiled_method_load() || 1512 JvmtiExport::should_post_compiled_method_unload()) { 1513 get_and_cache_jmethod_id(); 1514 } 1515 1516 if (JvmtiExport::should_post_compiled_method_load()) { 1517 // Let the Service thread (which is a real Java thread) post the event 1518 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); 1519 JvmtiDeferredEventQueue::enqueue( 1520 JvmtiDeferredEvent::compiled_method_load_event(this)); 1521 } 1522} 1523 1524jmethodID nmethod::get_and_cache_jmethod_id() { 1525 if (_jmethod_id == NULL) { 1526 // Cache the jmethod_id since it can no longer be looked up once the 1527 // method itself has been marked for unloading. 1528 _jmethod_id = method()->jmethod_id(); 1529 } 1530 return _jmethod_id; 1531} 1532 1533void nmethod::post_compiled_method_unload() { 1534 if (unload_reported()) { 1535 // During unloading we transition to unloaded and then to zombie 1536 // and the unloading is reported during the first transition. 1537 return; 1538 } 1539 1540 assert(_method != NULL && !is_unloaded(), "just checking"); 1541 DTRACE_METHOD_UNLOAD_PROBE(method()); 1542 1543 // If a JVMTI agent has enabled the CompiledMethodUnload event then 1544 // post the event. Sometime later this nmethod will be made a zombie 1545 // by the sweeper but the Method* will not be valid at that point. 1546 // If the _jmethod_id is null then no load event was ever requested 1547 // so don't bother posting the unload. The main reason for this is 1548 // that the jmethodID is a weak reference to the Method* so if 1549 // it's being unloaded there's no way to look it up since the weak 1550 // ref will have been cleared. 1551 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) { 1552 assert(!unload_reported(), "already unloaded"); 1553 JvmtiDeferredEvent event = 1554 JvmtiDeferredEvent::compiled_method_unload_event(this, 1555 _jmethod_id, insts_begin()); 1556 if (SafepointSynchronize::is_at_safepoint()) { 1557 // Don't want to take the queueing lock. Add it as pending and 1558 // it will get enqueued later. 1559 JvmtiDeferredEventQueue::add_pending_event(event); 1560 } else { 1561 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); 1562 JvmtiDeferredEventQueue::enqueue(event); 1563 } 1564 } 1565 1566 // The JVMTI CompiledMethodUnload event can be enabled or disabled at 1567 // any time. As the nmethod is being unloaded now we mark it has 1568 // having the unload event reported - this will ensure that we don't 1569 // attempt to report the event in the unlikely scenario where the 1570 // event is enabled at the time the nmethod is made a zombie. 1571 set_unload_reported(); 1572} 1573 1574void static clean_ic_if_metadata_is_dead(CompiledIC *ic, BoolObjectClosure *is_alive, bool mark_on_stack) { 1575 if (ic->is_icholder_call()) { 1576 // The only exception is compiledICHolder oops which may 1577 // yet be marked below. (We check this further below). 1578 CompiledICHolder* cichk_oop = ic->cached_icholder(); 1579 1580 if (mark_on_stack) { 1581 Metadata::mark_on_stack(cichk_oop->holder_method()); 1582 Metadata::mark_on_stack(cichk_oop->holder_klass()); 1583 } 1584 1585 if (cichk_oop->holder_method()->method_holder()->is_loader_alive(is_alive) && 1586 cichk_oop->holder_klass()->is_loader_alive(is_alive)) { 1587 return; 1588 } 1589 } else { 1590 Metadata* ic_oop = ic->cached_metadata(); 1591 if (ic_oop != NULL) { 1592 if (mark_on_stack) { 1593 Metadata::mark_on_stack(ic_oop); 1594 } 1595 1596 if (ic_oop->is_klass()) { 1597 if (((Klass*)ic_oop)->is_loader_alive(is_alive)) { 1598 return; 1599 } 1600 } else if (ic_oop->is_method()) { 1601 if (((Method*)ic_oop)->method_holder()->is_loader_alive(is_alive)) { 1602 return; 1603 } 1604 } else { 1605 ShouldNotReachHere(); 1606 } 1607 } 1608 } 1609 1610 ic->set_to_clean(); 1611} 1612 1613// This is called at the end of the strong tracing/marking phase of a 1614// GC to unload an nmethod if it contains otherwise unreachable 1615// oops. 1616 1617void nmethod::do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred) { 1618 // Make sure the oop's ready to receive visitors 1619 assert(!is_zombie() && !is_unloaded(), 1620 "should not call follow on zombie or unloaded nmethod"); 1621 1622 // If the method is not entrant then a JMP is plastered over the 1623 // first few bytes. If an oop in the old code was there, that oop 1624 // should not get GC'd. Skip the first few bytes of oops on 1625 // not-entrant methods. 1626 address low_boundary = verified_entry_point(); 1627 if (is_not_entrant()) { 1628 low_boundary += NativeJump::instruction_size; 1629 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1630 // (See comment above.) 1631 } 1632 1633 // The RedefineClasses() API can cause the class unloading invariant 1634 // to no longer be true. See jvmtiExport.hpp for details. 1635 // Also, leave a debugging breadcrumb in local flag. 1636 bool a_class_was_redefined = JvmtiExport::has_redefined_a_class(); 1637 if (a_class_was_redefined) { 1638 // This set of the unloading_occurred flag is done before the 1639 // call to post_compiled_method_unload() so that the unloading 1640 // of this nmethod is reported. 1641 unloading_occurred = true; 1642 } 1643 1644 // Exception cache 1645 clean_exception_cache(is_alive); 1646 1647 // If class unloading occurred we first iterate over all inline caches and 1648 // clear ICs where the cached oop is referring to an unloaded klass or method. 1649 // The remaining live cached oops will be traversed in the relocInfo::oop_type 1650 // iteration below. 1651 if (unloading_occurred) { 1652 RelocIterator iter(this, low_boundary); 1653 while(iter.next()) { 1654 if (iter.type() == relocInfo::virtual_call_type) { 1655 CompiledIC *ic = CompiledIC_at(&iter); 1656 clean_ic_if_metadata_is_dead(ic, is_alive, false); 1657 } 1658 } 1659 } 1660 1661 // Compiled code 1662 { 1663 RelocIterator iter(this, low_boundary); 1664 while (iter.next()) { 1665 if (iter.type() == relocInfo::oop_type) { 1666 oop_Relocation* r = iter.oop_reloc(); 1667 // In this loop, we must only traverse those oops directly embedded in 1668 // the code. Other oops (oop_index>0) are seen as part of scopes_oops. 1669 assert(1 == (r->oop_is_immediate()) + 1670 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 1671 "oop must be found in exactly one place"); 1672 if (r->oop_is_immediate() && r->oop_value() != NULL) { 1673 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) { 1674 return; 1675 } 1676 } 1677 } 1678 } 1679 } 1680 1681 1682 // Scopes 1683 for (oop* p = oops_begin(); p < oops_end(); p++) { 1684 if (*p == Universe::non_oop_word()) continue; // skip non-oops 1685 if (can_unload(is_alive, p, unloading_occurred)) { 1686 return; 1687 } 1688 } 1689 1690 // Ensure that all metadata is still alive 1691 verify_metadata_loaders(low_boundary, is_alive); 1692} 1693 1694template <class CompiledICorStaticCall> 1695static bool clean_if_nmethod_is_unloaded(CompiledICorStaticCall *ic, address addr, BoolObjectClosure *is_alive, nmethod* from) { 1696 // Ok, to lookup references to zombies here 1697 CodeBlob *cb = CodeCache::find_blob_unsafe(addr); 1698 if (cb != NULL && cb->is_nmethod()) { 1699 nmethod* nm = (nmethod*)cb; 1700 1701 if (nm->unloading_clock() != nmethod::global_unloading_clock()) { 1702 // The nmethod has not been processed yet. 1703 return true; 1704 } 1705 1706 // Clean inline caches pointing to both zombie and not_entrant methods 1707 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 1708 ic->set_to_clean(); 1709 assert(ic->is_clean(), err_msg("nmethod " PTR_FORMAT "not clean %s", from, from->method()->name_and_sig_as_C_string())); 1710 } 1711 } 1712 1713 return false; 1714} 1715 1716static bool clean_if_nmethod_is_unloaded(CompiledIC *ic, BoolObjectClosure *is_alive, nmethod* from) { 1717 return clean_if_nmethod_is_unloaded(ic, ic->ic_destination(), is_alive, from); 1718} 1719 1720static bool clean_if_nmethod_is_unloaded(CompiledStaticCall *csc, BoolObjectClosure *is_alive, nmethod* from) { 1721 return clean_if_nmethod_is_unloaded(csc, csc->destination(), is_alive, from); 1722} 1723 1724bool nmethod::unload_if_dead_at(RelocIterator* iter_at_oop, BoolObjectClosure *is_alive, bool unloading_occurred) { 1725 assert(iter_at_oop->type() == relocInfo::oop_type, "Wrong relocation type"); 1726 1727 oop_Relocation* r = iter_at_oop->oop_reloc(); 1728 // Traverse those oops directly embedded in the code. 1729 // Other oops (oop_index>0) are seen as part of scopes_oops. 1730 assert(1 == (r->oop_is_immediate()) + 1731 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 1732 "oop must be found in exactly one place"); 1733 if (r->oop_is_immediate() && r->oop_value() != NULL) { 1734 // Unload this nmethod if the oop is dead. 1735 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) { 1736 return true;; 1737 } 1738 } 1739 1740 return false; 1741} 1742 1743void nmethod::mark_metadata_on_stack_at(RelocIterator* iter_at_metadata) { 1744 assert(iter_at_metadata->type() == relocInfo::metadata_type, "Wrong relocation type"); 1745 1746 metadata_Relocation* r = iter_at_metadata->metadata_reloc(); 1747 // In this metadata, we must only follow those metadatas directly embedded in 1748 // the code. Other metadatas (oop_index>0) are seen as part of 1749 // the metadata section below. 1750 assert(1 == (r->metadata_is_immediate()) + 1751 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()), 1752 "metadata must be found in exactly one place"); 1753 if (r->metadata_is_immediate() && r->metadata_value() != NULL) { 1754 Metadata* md = r->metadata_value(); 1755 if (md != _method) Metadata::mark_on_stack(md); 1756 } 1757} 1758 1759void nmethod::mark_metadata_on_stack_non_relocs() { 1760 // Visit the metadata section 1761 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) { 1762 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops 1763 Metadata* md = *p; 1764 Metadata::mark_on_stack(md); 1765 } 1766 1767 // Visit metadata not embedded in the other places. 1768 if (_method != NULL) Metadata::mark_on_stack(_method); 1769} 1770 1771bool nmethod::do_unloading_parallel(BoolObjectClosure* is_alive, bool unloading_occurred) { 1772 ResourceMark rm; 1773 1774 // Make sure the oop's ready to receive visitors 1775 assert(!is_zombie() && !is_unloaded(), 1776 "should not call follow on zombie or unloaded nmethod"); 1777 1778 // If the method is not entrant then a JMP is plastered over the 1779 // first few bytes. If an oop in the old code was there, that oop 1780 // should not get GC'd. Skip the first few bytes of oops on 1781 // not-entrant methods. 1782 address low_boundary = verified_entry_point(); 1783 if (is_not_entrant()) { 1784 low_boundary += NativeJump::instruction_size; 1785 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1786 // (See comment above.) 1787 } 1788 1789 // The RedefineClasses() API can cause the class unloading invariant 1790 // to no longer be true. See jvmtiExport.hpp for details. 1791 // Also, leave a debugging breadcrumb in local flag. 1792 bool a_class_was_redefined = JvmtiExport::has_redefined_a_class(); 1793 if (a_class_was_redefined) { 1794 // This set of the unloading_occurred flag is done before the 1795 // call to post_compiled_method_unload() so that the unloading 1796 // of this nmethod is reported. 1797 unloading_occurred = true; 1798 } 1799 1800 // When class redefinition is used all metadata in the CodeCache has to be recorded, 1801 // so that unused "previous versions" can be purged. Since walking the CodeCache can 1802 // be expensive, the "mark on stack" is piggy-backed on this parallel unloading code. 1803 bool mark_metadata_on_stack = a_class_was_redefined; 1804 1805 // Exception cache 1806 clean_exception_cache(is_alive); 1807 1808 bool is_unloaded = false; 1809 bool postponed = false; 1810 1811 RelocIterator iter(this, low_boundary); 1812 while(iter.next()) { 1813 1814 switch (iter.type()) { 1815 1816 case relocInfo::virtual_call_type: 1817 if (unloading_occurred) { 1818 // If class unloading occurred we first iterate over all inline caches and 1819 // clear ICs where the cached oop is referring to an unloaded klass or method. 1820 clean_ic_if_metadata_is_dead(CompiledIC_at(&iter), is_alive, mark_metadata_on_stack); 1821 } 1822 1823 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this); 1824 break; 1825 1826 case relocInfo::opt_virtual_call_type: 1827 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this); 1828 break; 1829 1830 case relocInfo::static_call_type: 1831 postponed |= clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this); 1832 break; 1833 1834 case relocInfo::oop_type: 1835 if (!is_unloaded) { 1836 is_unloaded = unload_if_dead_at(&iter, is_alive, unloading_occurred); 1837 } 1838 break; 1839 1840 case relocInfo::metadata_type: 1841 if (mark_metadata_on_stack) { 1842 mark_metadata_on_stack_at(&iter); 1843 } 1844 } 1845 } 1846 1847 if (mark_metadata_on_stack) { 1848 mark_metadata_on_stack_non_relocs(); 1849 } 1850 1851 if (is_unloaded) { 1852 return postponed; 1853 } 1854 1855 // Scopes 1856 for (oop* p = oops_begin(); p < oops_end(); p++) { 1857 if (*p == Universe::non_oop_word()) continue; // skip non-oops 1858 if (can_unload(is_alive, p, unloading_occurred)) { 1859 is_unloaded = true; 1860 break; 1861 } 1862 } 1863 1864 if (is_unloaded) { 1865 return postponed; 1866 } 1867 1868 // Ensure that all metadata is still alive 1869 verify_metadata_loaders(low_boundary, is_alive); 1870 1871 return postponed; 1872} 1873 1874void nmethod::do_unloading_parallel_postponed(BoolObjectClosure* is_alive, bool unloading_occurred) { 1875 ResourceMark rm; 1876 1877 // Make sure the oop's ready to receive visitors 1878 assert(!is_zombie(), 1879 "should not call follow on zombie nmethod"); 1880 1881 // If the method is not entrant then a JMP is plastered over the 1882 // first few bytes. If an oop in the old code was there, that oop 1883 // should not get GC'd. Skip the first few bytes of oops on 1884 // not-entrant methods. 1885 address low_boundary = verified_entry_point(); 1886 if (is_not_entrant()) { 1887 low_boundary += NativeJump::instruction_size; 1888 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1889 // (See comment above.) 1890 } 1891 1892 RelocIterator iter(this, low_boundary); 1893 while(iter.next()) { 1894 1895 switch (iter.type()) { 1896 1897 case relocInfo::virtual_call_type: 1898 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this); 1899 break; 1900 1901 case relocInfo::opt_virtual_call_type: 1902 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this); 1903 break; 1904 1905 case relocInfo::static_call_type: 1906 clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this); 1907 break; 1908 } 1909 } 1910} 1911 1912#ifdef ASSERT 1913 1914class CheckClass : AllStatic { 1915 static BoolObjectClosure* _is_alive; 1916 1917 // Check class_loader is alive for this bit of metadata. 1918 static void check_class(Metadata* md) { 1919 Klass* klass = NULL; 1920 if (md->is_klass()) { 1921 klass = ((Klass*)md); 1922 } else if (md->is_method()) { 1923 klass = ((Method*)md)->method_holder(); 1924 } else if (md->is_methodData()) { 1925 klass = ((MethodData*)md)->method()->method_holder(); 1926 } else { 1927 md->print(); 1928 ShouldNotReachHere(); 1929 } 1930 assert(klass->is_loader_alive(_is_alive), "must be alive"); 1931 } 1932 public: 1933 static void do_check_class(BoolObjectClosure* is_alive, nmethod* nm) { 1934 assert(SafepointSynchronize::is_at_safepoint(), "this is only ok at safepoint"); 1935 _is_alive = is_alive; 1936 nm->metadata_do(check_class); 1937 } 1938}; 1939 1940// This is called during a safepoint so can use static data 1941BoolObjectClosure* CheckClass::_is_alive = NULL; 1942#endif // ASSERT 1943 1944 1945// Processing of oop references should have been sufficient to keep 1946// all strong references alive. Any weak references should have been 1947// cleared as well. Visit all the metadata and ensure that it's 1948// really alive. 1949void nmethod::verify_metadata_loaders(address low_boundary, BoolObjectClosure* is_alive) { 1950#ifdef ASSERT 1951 RelocIterator iter(this, low_boundary); 1952 while (iter.next()) { 1953 // static_stub_Relocations may have dangling references to 1954 // Method*s so trim them out here. Otherwise it looks like 1955 // compiled code is maintaining a link to dead metadata. 1956 address static_call_addr = NULL; 1957 if (iter.type() == relocInfo::opt_virtual_call_type) { 1958 CompiledIC* cic = CompiledIC_at(&iter); 1959 if (!cic->is_call_to_interpreted()) { 1960 static_call_addr = iter.addr(); 1961 } 1962 } else if (iter.type() == relocInfo::static_call_type) { 1963 CompiledStaticCall* csc = compiledStaticCall_at(iter.reloc()); 1964 if (!csc->is_call_to_interpreted()) { 1965 static_call_addr = iter.addr(); 1966 } 1967 } 1968 if (static_call_addr != NULL) { 1969 RelocIterator sciter(this, low_boundary); 1970 while (sciter.next()) { 1971 if (sciter.type() == relocInfo::static_stub_type && 1972 sciter.static_stub_reloc()->static_call() == static_call_addr) { 1973 sciter.static_stub_reloc()->clear_inline_cache(); 1974 } 1975 } 1976 } 1977 } 1978 // Check that the metadata embedded in the nmethod is alive 1979 CheckClass::do_check_class(is_alive, this); 1980#endif 1981} 1982 1983 1984// Iterate over metadata calling this function. Used by RedefineClasses 1985void nmethod::metadata_do(void f(Metadata*)) { 1986 address low_boundary = verified_entry_point(); 1987 if (is_not_entrant()) { 1988 low_boundary += NativeJump::instruction_size; 1989 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1990 // (See comment above.) 1991 } 1992 { 1993 // Visit all immediate references that are embedded in the instruction stream. 1994 RelocIterator iter(this, low_boundary); 1995 while (iter.next()) { 1996 if (iter.type() == relocInfo::metadata_type ) { 1997 metadata_Relocation* r = iter.metadata_reloc(); 1998 // In this metadata, we must only follow those metadatas directly embedded in 1999 // the code. Other metadatas (oop_index>0) are seen as part of 2000 // the metadata section below. 2001 assert(1 == (r->metadata_is_immediate()) + 2002 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()), 2003 "metadata must be found in exactly one place"); 2004 if (r->metadata_is_immediate() && r->metadata_value() != NULL) { 2005 Metadata* md = r->metadata_value(); 2006 if (md != _method) f(md); 2007 } 2008 } else if (iter.type() == relocInfo::virtual_call_type) { 2009 // Check compiledIC holders associated with this nmethod 2010 CompiledIC *ic = CompiledIC_at(&iter); 2011 if (ic->is_icholder_call()) { 2012 CompiledICHolder* cichk = ic->cached_icholder(); 2013 f(cichk->holder_method()); 2014 f(cichk->holder_klass()); 2015 } else { 2016 Metadata* ic_oop = ic->cached_metadata(); 2017 if (ic_oop != NULL) { 2018 f(ic_oop); 2019 } 2020 } 2021 } 2022 } 2023 } 2024 2025 // Visit the metadata section 2026 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) { 2027 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops 2028 Metadata* md = *p; 2029 f(md); 2030 } 2031 2032 // Visit metadata not embedded in the other places. 2033 if (_method != NULL) f(_method); 2034} 2035 2036void nmethod::oops_do(OopClosure* f, bool allow_zombie) { 2037 // make sure the oops ready to receive visitors 2038 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod"); 2039 assert(!is_unloaded(), "should not call follow on unloaded nmethod"); 2040 2041 // If the method is not entrant or zombie then a JMP is plastered over the 2042 // first few bytes. If an oop in the old code was there, that oop 2043 // should not get GC'd. Skip the first few bytes of oops on 2044 // not-entrant methods. 2045 address low_boundary = verified_entry_point(); 2046 if (is_not_entrant()) { 2047 low_boundary += NativeJump::instruction_size; 2048 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 2049 // (See comment above.) 2050 } 2051 2052 RelocIterator iter(this, low_boundary); 2053 2054 while (iter.next()) { 2055 if (iter.type() == relocInfo::oop_type ) { 2056 oop_Relocation* r = iter.oop_reloc(); 2057 // In this loop, we must only follow those oops directly embedded in 2058 // the code. Other oops (oop_index>0) are seen as part of scopes_oops. 2059 assert(1 == (r->oop_is_immediate()) + 2060 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 2061 "oop must be found in exactly one place"); 2062 if (r->oop_is_immediate() && r->oop_value() != NULL) { 2063 f->do_oop(r->oop_addr()); 2064 } 2065 } 2066 } 2067 2068 // Scopes 2069 // This includes oop constants not inlined in the code stream. 2070 for (oop* p = oops_begin(); p < oops_end(); p++) { 2071 if (*p == Universe::non_oop_word()) continue; // skip non-oops 2072 f->do_oop(p); 2073 } 2074} 2075 2076#define NMETHOD_SENTINEL ((nmethod*)badAddress) 2077 2078nmethod* volatile nmethod::_oops_do_mark_nmethods; 2079 2080// An nmethod is "marked" if its _mark_link is set non-null. 2081// Even if it is the end of the linked list, it will have a non-null link value, 2082// as long as it is on the list. 2083// This code must be MP safe, because it is used from parallel GC passes. 2084bool nmethod::test_set_oops_do_mark() { 2085 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called"); 2086 nmethod* observed_mark_link = _oops_do_mark_link; 2087 if (observed_mark_link == NULL) { 2088 // Claim this nmethod for this thread to mark. 2089 observed_mark_link = (nmethod*) 2090 Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_link, NULL); 2091 if (observed_mark_link == NULL) { 2092 2093 // Atomically append this nmethod (now claimed) to the head of the list: 2094 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods; 2095 for (;;) { 2096 nmethod* required_mark_nmethods = observed_mark_nmethods; 2097 _oops_do_mark_link = required_mark_nmethods; 2098 observed_mark_nmethods = (nmethod*) 2099 Atomic::cmpxchg_ptr(this, &_oops_do_mark_nmethods, required_mark_nmethods); 2100 if (observed_mark_nmethods == required_mark_nmethods) 2101 break; 2102 } 2103 // Mark was clear when we first saw this guy. 2104 NOT_PRODUCT(if (TraceScavenge) print_on(tty, "oops_do, mark")); 2105 return false; 2106 } 2107 } 2108 // On fall through, another racing thread marked this nmethod before we did. 2109 return true; 2110} 2111 2112void nmethod::oops_do_marking_prologue() { 2113 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("[oops_do_marking_prologue")); 2114 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row"); 2115 // We use cmpxchg_ptr instead of regular assignment here because the user 2116 // may fork a bunch of threads, and we need them all to see the same state. 2117 void* observed = Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, NULL); 2118 guarantee(observed == NULL, "no races in this sequential code"); 2119} 2120 2121void nmethod::oops_do_marking_epilogue() { 2122 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row"); 2123 nmethod* cur = _oops_do_mark_nmethods; 2124 while (cur != NMETHOD_SENTINEL) { 2125 assert(cur != NULL, "not NULL-terminated"); 2126 nmethod* next = cur->_oops_do_mark_link; 2127 cur->_oops_do_mark_link = NULL; 2128 cur->verify_oop_relocations(); 2129 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark")); 2130 cur = next; 2131 } 2132 void* required = _oops_do_mark_nmethods; 2133 void* observed = Atomic::cmpxchg_ptr(NULL, &_oops_do_mark_nmethods, required); 2134 guarantee(observed == required, "no races in this sequential code"); 2135 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("oops_do_marking_epilogue]")); 2136} 2137 2138class DetectScavengeRoot: public OopClosure { 2139 bool _detected_scavenge_root; 2140public: 2141 DetectScavengeRoot() : _detected_scavenge_root(false) 2142 { NOT_PRODUCT(_print_nm = NULL); } 2143 bool detected_scavenge_root() { return _detected_scavenge_root; } 2144 virtual void do_oop(oop* p) { 2145 if ((*p) != NULL && (*p)->is_scavengable()) { 2146 NOT_PRODUCT(maybe_print(p)); 2147 _detected_scavenge_root = true; 2148 } 2149 } 2150 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2151 2152#ifndef PRODUCT 2153 nmethod* _print_nm; 2154 void maybe_print(oop* p) { 2155 if (_print_nm == NULL) return; 2156 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root"); 2157 tty->print_cr(""PTR_FORMAT"[offset=%d] detected scavengable oop "PTR_FORMAT" (found at "PTR_FORMAT")", 2158 _print_nm, (int)((intptr_t)p - (intptr_t)_print_nm), 2159 (void *)(*p), (intptr_t)p); 2160 (*p)->print(); 2161 } 2162#endif //PRODUCT 2163}; 2164 2165bool nmethod::detect_scavenge_root_oops() { 2166 DetectScavengeRoot detect_scavenge_root; 2167 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this); 2168 oops_do(&detect_scavenge_root); 2169 return detect_scavenge_root.detected_scavenge_root(); 2170} 2171 2172// Method that knows how to preserve outgoing arguments at call. This method must be 2173// called with a frame corresponding to a Java invoke 2174void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { 2175#ifndef SHARK 2176 if (!method()->is_native()) { 2177 SimpleScopeDesc ssd(this, fr.pc()); 2178 Bytecode_invoke call(ssd.method(), ssd.bci()); 2179 bool has_receiver = call.has_receiver(); 2180 bool has_appendix = call.has_appendix(); 2181 Symbol* signature = call.signature(); 2182 fr.oops_compiled_arguments_do(signature, has_receiver, has_appendix, reg_map, f); 2183 } 2184#endif // !SHARK 2185} 2186 2187 2188oop nmethod::embeddedOop_at(u_char* p) { 2189 RelocIterator iter(this, p, p + 1); 2190 while (iter.next()) 2191 if (iter.type() == relocInfo::oop_type) { 2192 return iter.oop_reloc()->oop_value(); 2193 } 2194 return NULL; 2195} 2196 2197 2198inline bool includes(void* p, void* from, void* to) { 2199 return from <= p && p < to; 2200} 2201 2202 2203void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) { 2204 assert(count >= 2, "must be sentinel values, at least"); 2205 2206#ifdef ASSERT 2207 // must be sorted and unique; we do a binary search in find_pc_desc() 2208 int prev_offset = pcs[0].pc_offset(); 2209 assert(prev_offset == PcDesc::lower_offset_limit, 2210 "must start with a sentinel"); 2211 for (int i = 1; i < count; i++) { 2212 int this_offset = pcs[i].pc_offset(); 2213 assert(this_offset > prev_offset, "offsets must be sorted"); 2214 prev_offset = this_offset; 2215 } 2216 assert(prev_offset == PcDesc::upper_offset_limit, 2217 "must end with a sentinel"); 2218#endif //ASSERT 2219 2220 // Search for MethodHandle invokes and tag the nmethod. 2221 for (int i = 0; i < count; i++) { 2222 if (pcs[i].is_method_handle_invoke()) { 2223 set_has_method_handle_invokes(true); 2224 break; 2225 } 2226 } 2227 assert(has_method_handle_invokes() == (_deoptimize_mh_offset != -1), "must have deopt mh handler"); 2228 2229 int size = count * sizeof(PcDesc); 2230 assert(scopes_pcs_size() >= size, "oob"); 2231 memcpy(scopes_pcs_begin(), pcs, size); 2232 2233 // Adjust the final sentinel downward. 2234 PcDesc* last_pc = &scopes_pcs_begin()[count-1]; 2235 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity"); 2236 last_pc->set_pc_offset(content_size() + 1); 2237 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) { 2238 // Fill any rounding gaps with copies of the last record. 2239 last_pc[1] = last_pc[0]; 2240 } 2241 // The following assert could fail if sizeof(PcDesc) is not 2242 // an integral multiple of oopSize (the rounding term). 2243 // If it fails, change the logic to always allocate a multiple 2244 // of sizeof(PcDesc), and fill unused words with copies of *last_pc. 2245 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly"); 2246} 2247 2248void nmethod::copy_scopes_data(u_char* buffer, int size) { 2249 assert(scopes_data_size() >= size, "oob"); 2250 memcpy(scopes_data_begin(), buffer, size); 2251} 2252 2253 2254#ifdef ASSERT 2255static PcDesc* linear_search(nmethod* nm, int pc_offset, bool approximate) { 2256 PcDesc* lower = nm->scopes_pcs_begin(); 2257 PcDesc* upper = nm->scopes_pcs_end(); 2258 lower += 1; // exclude initial sentinel 2259 PcDesc* res = NULL; 2260 for (PcDesc* p = lower; p < upper; p++) { 2261 NOT_PRODUCT(--nmethod_stats.pc_desc_tests); // don't count this call to match_desc 2262 if (match_desc(p, pc_offset, approximate)) { 2263 if (res == NULL) 2264 res = p; 2265 else 2266 res = (PcDesc*) badAddress; 2267 } 2268 } 2269 return res; 2270} 2271#endif 2272 2273 2274// Finds a PcDesc with real-pc equal to "pc" 2275PcDesc* nmethod::find_pc_desc_internal(address pc, bool approximate) { 2276 address base_address = code_begin(); 2277 if ((pc < base_address) || 2278 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) { 2279 return NULL; // PC is wildly out of range 2280 } 2281 int pc_offset = (int) (pc - base_address); 2282 2283 // Check the PcDesc cache if it contains the desired PcDesc 2284 // (This as an almost 100% hit rate.) 2285 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate); 2286 if (res != NULL) { 2287 assert(res == linear_search(this, pc_offset, approximate), "cache ok"); 2288 return res; 2289 } 2290 2291 // Fallback algorithm: quasi-linear search for the PcDesc 2292 // Find the last pc_offset less than the given offset. 2293 // The successor must be the required match, if there is a match at all. 2294 // (Use a fixed radix to avoid expensive affine pointer arithmetic.) 2295 PcDesc* lower = scopes_pcs_begin(); 2296 PcDesc* upper = scopes_pcs_end(); 2297 upper -= 1; // exclude final sentinel 2298 if (lower >= upper) return NULL; // native method; no PcDescs at all 2299 2300#define assert_LU_OK \ 2301 /* invariant on lower..upper during the following search: */ \ 2302 assert(lower->pc_offset() < pc_offset, "sanity"); \ 2303 assert(upper->pc_offset() >= pc_offset, "sanity") 2304 assert_LU_OK; 2305 2306 // Use the last successful return as a split point. 2307 PcDesc* mid = _pc_desc_cache.last_pc_desc(); 2308 NOT_PRODUCT(++nmethod_stats.pc_desc_searches); 2309 if (mid->pc_offset() < pc_offset) { 2310 lower = mid; 2311 } else { 2312 upper = mid; 2313 } 2314 2315 // Take giant steps at first (4096, then 256, then 16, then 1) 2316 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1); 2317 const int RADIX = (1 << LOG2_RADIX); 2318 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) { 2319 while ((mid = lower + step) < upper) { 2320 assert_LU_OK; 2321 NOT_PRODUCT(++nmethod_stats.pc_desc_searches); 2322 if (mid->pc_offset() < pc_offset) { 2323 lower = mid; 2324 } else { 2325 upper = mid; 2326 break; 2327 } 2328 } 2329 assert_LU_OK; 2330 } 2331 2332 // Sneak up on the value with a linear search of length ~16. 2333 while (true) { 2334 assert_LU_OK; 2335 mid = lower + 1; 2336 NOT_PRODUCT(++nmethod_stats.pc_desc_searches); 2337 if (mid->pc_offset() < pc_offset) { 2338 lower = mid; 2339 } else { 2340 upper = mid; 2341 break; 2342 } 2343 } 2344#undef assert_LU_OK 2345 2346 if (match_desc(upper, pc_offset, approximate)) { 2347 assert(upper == linear_search(this, pc_offset, approximate), "search ok"); 2348 _pc_desc_cache.add_pc_desc(upper); 2349 return upper; 2350 } else { 2351 assert(NULL == linear_search(this, pc_offset, approximate), "search ok"); 2352 return NULL; 2353 } 2354} 2355 2356 2357void nmethod::check_all_dependencies(DepChange& changes) { 2358 // Checked dependencies are allocated into this ResourceMark 2359 ResourceMark rm; 2360 2361 // Turn off dependency tracing while actually testing dependencies. 2362 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) ); 2363 2364 typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash, 2365 &DependencySignature::equals, 11027> DepTable; 2366 2367 DepTable* table = new DepTable(); 2368 2369 // Iterate over live nmethods and check dependencies of all nmethods that are not 2370 // marked for deoptimization. A particular dependency is only checked once. 2371 NMethodIterator iter; 2372 while(iter.next()) { 2373 nmethod* nm = iter.method(); 2374 // Only notify for live nmethods 2375 if (nm->is_alive() && !nm->is_marked_for_deoptimization()) { 2376 for (Dependencies::DepStream deps(nm); deps.next(); ) { 2377 // Construct abstraction of a dependency. 2378 DependencySignature* current_sig = new DependencySignature(deps); 2379 2380 // Determine if dependency is already checked. table->put(...) returns 2381 // 'true' if the dependency is added (i.e., was not in the hashtable). 2382 if (table->put(*current_sig, 1)) { 2383 if (deps.check_dependency() != NULL) { 2384 // Dependency checking failed. Print out information about the failed 2385 // dependency and finally fail with an assert. We can fail here, since 2386 // dependency checking is never done in a product build. 2387 changes.print(); 2388 nm->print(); 2389 nm->print_dependencies(); 2390 assert(false, "Should have been marked for deoptimization"); 2391 } 2392 } 2393 } 2394 } 2395 } 2396} 2397 2398bool nmethod::check_dependency_on(DepChange& changes) { 2399 // What has happened: 2400 // 1) a new class dependee has been added 2401 // 2) dependee and all its super classes have been marked 2402 bool found_check = false; // set true if we are upset 2403 for (Dependencies::DepStream deps(this); deps.next(); ) { 2404 // Evaluate only relevant dependencies. 2405 if (deps.spot_check_dependency_at(changes) != NULL) { 2406 found_check = true; 2407 NOT_DEBUG(break); 2408 } 2409 } 2410 return found_check; 2411} 2412 2413bool nmethod::is_evol_dependent_on(Klass* dependee) { 2414 InstanceKlass *dependee_ik = InstanceKlass::cast(dependee); 2415 Array<Method*>* dependee_methods = dependee_ik->methods(); 2416 for (Dependencies::DepStream deps(this); deps.next(); ) { 2417 if (deps.type() == Dependencies::evol_method) { 2418 Method* method = deps.method_argument(0); 2419 for (int j = 0; j < dependee_methods->length(); j++) { 2420 if (dependee_methods->at(j) == method) { 2421 // RC_TRACE macro has an embedded ResourceMark 2422 RC_TRACE(0x01000000, 2423 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)", 2424 _method->method_holder()->external_name(), 2425 _method->name()->as_C_string(), 2426 _method->signature()->as_C_string(), compile_id(), 2427 method->method_holder()->external_name(), 2428 method->name()->as_C_string(), 2429 method->signature()->as_C_string())); 2430 if (TraceDependencies || LogCompilation) 2431 deps.log_dependency(dependee); 2432 return true; 2433 } 2434 } 2435 } 2436 } 2437 return false; 2438} 2439 2440// Called from mark_for_deoptimization, when dependee is invalidated. 2441bool nmethod::is_dependent_on_method(Method* dependee) { 2442 for (Dependencies::DepStream deps(this); deps.next(); ) { 2443 if (deps.type() != Dependencies::evol_method) 2444 continue; 2445 Method* method = deps.method_argument(0); 2446 if (method == dependee) return true; 2447 } 2448 return false; 2449} 2450 2451 2452bool nmethod::is_patchable_at(address instr_addr) { 2453 assert(insts_contains(instr_addr), "wrong nmethod used"); 2454 if (is_zombie()) { 2455 // a zombie may never be patched 2456 return false; 2457 } 2458 return true; 2459} 2460 2461 2462address nmethod::continuation_for_implicit_exception(address pc) { 2463 // Exception happened outside inline-cache check code => we are inside 2464 // an active nmethod => use cpc to determine a return address 2465 int exception_offset = pc - code_begin(); 2466 int cont_offset = ImplicitExceptionTable(this).at( exception_offset ); 2467#ifdef ASSERT 2468 if (cont_offset == 0) { 2469 Thread* thread = ThreadLocalStorage::get_thread_slow(); 2470 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY 2471 HandleMark hm(thread); 2472 ResourceMark rm(thread); 2473 CodeBlob* cb = CodeCache::find_blob(pc); 2474 assert(cb != NULL && cb == this, ""); 2475 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, pc); 2476 print(); 2477 method()->print_codes(); 2478 print_code(); 2479 print_pcs(); 2480 } 2481#endif 2482 if (cont_offset == 0) { 2483 // Let the normal error handling report the exception 2484 return NULL; 2485 } 2486 return code_begin() + cont_offset; 2487} 2488 2489 2490 2491void nmethod_init() { 2492 // make sure you didn't forget to adjust the filler fields 2493 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word"); 2494} 2495 2496 2497//------------------------------------------------------------------------------------------- 2498 2499 2500// QQQ might we make this work from a frame?? 2501nmethodLocker::nmethodLocker(address pc) { 2502 CodeBlob* cb = CodeCache::find_blob(pc); 2503 guarantee(cb != NULL && cb->is_nmethod(), "bad pc for a nmethod found"); 2504 _nm = (nmethod*)cb; 2505 lock_nmethod(_nm); 2506} 2507 2508// Only JvmtiDeferredEvent::compiled_method_unload_event() 2509// should pass zombie_ok == true. 2510void nmethodLocker::lock_nmethod(nmethod* nm, bool zombie_ok) { 2511 if (nm == NULL) return; 2512 Atomic::inc(&nm->_lock_count); 2513 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method"); 2514} 2515 2516void nmethodLocker::unlock_nmethod(nmethod* nm) { 2517 if (nm == NULL) return; 2518 Atomic::dec(&nm->_lock_count); 2519 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock"); 2520} 2521 2522 2523// ----------------------------------------------------------------------------- 2524// nmethod::get_deopt_original_pc 2525// 2526// Return the original PC for the given PC if: 2527// (a) the given PC belongs to a nmethod and 2528// (b) it is a deopt PC 2529address nmethod::get_deopt_original_pc(const frame* fr) { 2530 if (fr->cb() == NULL) return NULL; 2531 2532 nmethod* nm = fr->cb()->as_nmethod_or_null(); 2533 if (nm != NULL && nm->is_deopt_pc(fr->pc())) 2534 return nm->get_original_pc(fr); 2535 2536 return NULL; 2537} 2538 2539 2540// ----------------------------------------------------------------------------- 2541// MethodHandle 2542 2543bool nmethod::is_method_handle_return(address return_pc) { 2544 if (!has_method_handle_invokes()) return false; 2545 PcDesc* pd = pc_desc_at(return_pc); 2546 if (pd == NULL) 2547 return false; 2548 return pd->is_method_handle_invoke(); 2549} 2550 2551 2552// ----------------------------------------------------------------------------- 2553// Verification 2554 2555class VerifyOopsClosure: public OopClosure { 2556 nmethod* _nm; 2557 bool _ok; 2558public: 2559 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { } 2560 bool ok() { return _ok; } 2561 virtual void do_oop(oop* p) { 2562 if ((*p) == NULL || (*p)->is_oop()) return; 2563 if (_ok) { 2564 _nm->print_nmethod(true); 2565 _ok = false; 2566 } 2567 tty->print_cr("*** non-oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)", 2568 (void *)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm)); 2569 } 2570 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2571}; 2572 2573void nmethod::verify() { 2574 2575 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant 2576 // seems odd. 2577 2578 if( is_zombie() || is_not_entrant() ) 2579 return; 2580 2581 // Make sure all the entry points are correctly aligned for patching. 2582 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point()); 2583 2584 // assert(method()->is_oop(), "must be valid"); 2585 2586 ResourceMark rm; 2587 2588 if (!CodeCache::contains(this)) { 2589 fatal(err_msg("nmethod at " INTPTR_FORMAT " not in zone", this)); 2590 } 2591 2592 if(is_native_method() ) 2593 return; 2594 2595 nmethod* nm = CodeCache::find_nmethod(verified_entry_point()); 2596 if (nm != this) { 2597 fatal(err_msg("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", 2598 this)); 2599 } 2600 2601 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2602 if (! p->verify(this)) { 2603 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", this); 2604 } 2605 } 2606 2607 VerifyOopsClosure voc(this); 2608 oops_do(&voc); 2609 assert(voc.ok(), "embedded oops must be OK"); 2610 verify_scavenge_root_oops(); 2611 2612 verify_scopes(); 2613} 2614 2615 2616void nmethod::verify_interrupt_point(address call_site) { 2617 // Verify IC only when nmethod installation is finished. 2618 bool is_installed = (method()->code() == this) // nmethod is in state 'in_use' and installed 2619 || !this->is_in_use(); // nmethod is installed, but not in 'in_use' state 2620 if (is_installed) { 2621 Thread *cur = Thread::current(); 2622 if (CompiledIC_lock->owner() == cur || 2623 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) && 2624 SafepointSynchronize::is_at_safepoint())) { 2625 CompiledIC_at(this, call_site); 2626 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); 2627 } else { 2628 MutexLocker ml_verify (CompiledIC_lock); 2629 CompiledIC_at(this, call_site); 2630 } 2631 } 2632 2633 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address()); 2634 assert(pd != NULL, "PcDesc must exist"); 2635 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(), 2636 pd->obj_decode_offset(), pd->should_reexecute(), 2637 pd->return_oop()); 2638 !sd->is_top(); sd = sd->sender()) { 2639 sd->verify(); 2640 } 2641} 2642 2643void nmethod::verify_scopes() { 2644 if( !method() ) return; // Runtime stubs have no scope 2645 if (method()->is_native()) return; // Ignore stub methods. 2646 // iterate through all interrupt point 2647 // and verify the debug information is valid. 2648 RelocIterator iter((nmethod*)this); 2649 while (iter.next()) { 2650 address stub = NULL; 2651 switch (iter.type()) { 2652 case relocInfo::virtual_call_type: 2653 verify_interrupt_point(iter.addr()); 2654 break; 2655 case relocInfo::opt_virtual_call_type: 2656 stub = iter.opt_virtual_call_reloc()->static_stub(); 2657 verify_interrupt_point(iter.addr()); 2658 break; 2659 case relocInfo::static_call_type: 2660 stub = iter.static_call_reloc()->static_stub(); 2661 //verify_interrupt_point(iter.addr()); 2662 break; 2663 case relocInfo::runtime_call_type: 2664 address destination = iter.reloc()->value(); 2665 // Right now there is no way to find out which entries support 2666 // an interrupt point. It would be nice if we had this 2667 // information in a table. 2668 break; 2669 } 2670 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section"); 2671 } 2672} 2673 2674 2675// ----------------------------------------------------------------------------- 2676// Non-product code 2677#ifndef PRODUCT 2678 2679class DebugScavengeRoot: public OopClosure { 2680 nmethod* _nm; 2681 bool _ok; 2682public: 2683 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { } 2684 bool ok() { return _ok; } 2685 virtual void do_oop(oop* p) { 2686 if ((*p) == NULL || !(*p)->is_scavengable()) return; 2687 if (_ok) { 2688 _nm->print_nmethod(true); 2689 _ok = false; 2690 } 2691 tty->print_cr("*** scavengable oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)", 2692 (void *)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm)); 2693 (*p)->print(); 2694 } 2695 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2696}; 2697 2698void nmethod::verify_scavenge_root_oops() { 2699 if (UseG1GC) { 2700 return; 2701 } 2702 2703 if (!on_scavenge_root_list()) { 2704 // Actually look inside, to verify the claim that it's clean. 2705 DebugScavengeRoot debug_scavenge_root(this); 2706 oops_do(&debug_scavenge_root); 2707 if (!debug_scavenge_root.ok()) 2708 fatal("found an unadvertised bad scavengable oop in the code cache"); 2709 } 2710 assert(scavenge_root_not_marked(), ""); 2711} 2712 2713#endif // PRODUCT 2714 2715// Printing operations 2716 2717void nmethod::print() const { 2718 ResourceMark rm; 2719 ttyLocker ttyl; // keep the following output all in one block 2720 2721 tty->print("Compiled method "); 2722 2723 if (is_compiled_by_c1()) { 2724 tty->print("(c1) "); 2725 } else if (is_compiled_by_c2()) { 2726 tty->print("(c2) "); 2727 } else if (is_compiled_by_shark()) { 2728 tty->print("(shark) "); 2729 } else { 2730 tty->print("(nm) "); 2731 } 2732 2733 print_on(tty, NULL); 2734 2735 if (WizardMode) { 2736 tty->print("((nmethod*) "INTPTR_FORMAT ") ", this); 2737 tty->print(" for method " INTPTR_FORMAT , (address)method()); 2738 tty->print(" { "); 2739 if (is_in_use()) tty->print("in_use "); 2740 if (is_not_entrant()) tty->print("not_entrant "); 2741 if (is_zombie()) tty->print("zombie "); 2742 if (is_unloaded()) tty->print("unloaded "); 2743 if (on_scavenge_root_list()) tty->print("scavenge_root "); 2744 tty->print_cr("}:"); 2745 } 2746 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2747 (address)this, 2748 (address)this + size(), 2749 size()); 2750 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2751 relocation_begin(), 2752 relocation_end(), 2753 relocation_size()); 2754 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2755 consts_begin(), 2756 consts_end(), 2757 consts_size()); 2758 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2759 insts_begin(), 2760 insts_end(), 2761 insts_size()); 2762 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2763 stub_begin(), 2764 stub_end(), 2765 stub_size()); 2766 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2767 oops_begin(), 2768 oops_end(), 2769 oops_size()); 2770 if (metadata_size () > 0) tty->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2771 metadata_begin(), 2772 metadata_end(), 2773 metadata_size()); 2774 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2775 scopes_data_begin(), 2776 scopes_data_end(), 2777 scopes_data_size()); 2778 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2779 scopes_pcs_begin(), 2780 scopes_pcs_end(), 2781 scopes_pcs_size()); 2782 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2783 dependencies_begin(), 2784 dependencies_end(), 2785 dependencies_size()); 2786 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2787 handler_table_begin(), 2788 handler_table_end(), 2789 handler_table_size()); 2790 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2791 nul_chk_table_begin(), 2792 nul_chk_table_end(), 2793 nul_chk_table_size()); 2794} 2795 2796void nmethod::print_code() { 2797 HandleMark hm; 2798 ResourceMark m; 2799 Disassembler::decode(this); 2800} 2801 2802 2803#ifndef PRODUCT 2804 2805void nmethod::print_scopes() { 2806 // Find the first pc desc for all scopes in the code and print it. 2807 ResourceMark rm; 2808 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2809 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null) 2810 continue; 2811 2812 ScopeDesc* sd = scope_desc_at(p->real_pc(this)); 2813 sd->print_on(tty, p); 2814 } 2815} 2816 2817void nmethod::print_dependencies() { 2818 ResourceMark rm; 2819 ttyLocker ttyl; // keep the following output all in one block 2820 tty->print_cr("Dependencies:"); 2821 for (Dependencies::DepStream deps(this); deps.next(); ) { 2822 deps.print_dependency(); 2823 Klass* ctxk = deps.context_type(); 2824 if (ctxk != NULL) { 2825 if (ctxk->oop_is_instance() && ((InstanceKlass*)ctxk)->is_dependent_nmethod(this)) { 2826 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name()); 2827 } 2828 } 2829 deps.log_dependency(); // put it into the xml log also 2830 } 2831} 2832 2833 2834void nmethod::print_relocations() { 2835 ResourceMark m; // in case methods get printed via the debugger 2836 tty->print_cr("relocations:"); 2837 RelocIterator iter(this); 2838 iter.print(); 2839 if (UseRelocIndex) { 2840 jint* index_end = (jint*)relocation_end() - 1; 2841 jint index_size = *index_end; 2842 jint* index_start = (jint*)( (address)index_end - index_size ); 2843 tty->print_cr(" index @" INTPTR_FORMAT ": index_size=%d", index_start, index_size); 2844 if (index_size > 0) { 2845 jint* ip; 2846 for (ip = index_start; ip+2 <= index_end; ip += 2) 2847 tty->print_cr(" (%d %d) addr=" INTPTR_FORMAT " @" INTPTR_FORMAT, 2848 ip[0], 2849 ip[1], 2850 header_end()+ip[0], 2851 relocation_begin()-1+ip[1]); 2852 for (; ip < index_end; ip++) 2853 tty->print_cr(" (%d ?)", ip[0]); 2854 tty->print_cr(" @" INTPTR_FORMAT ": index_size=%d", ip, *ip); 2855 ip++; 2856 tty->print_cr("reloc_end @" INTPTR_FORMAT ":", ip); 2857 } 2858 } 2859} 2860 2861 2862void nmethod::print_pcs() { 2863 ResourceMark m; // in case methods get printed via debugger 2864 tty->print_cr("pc-bytecode offsets:"); 2865 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2866 p->print(this); 2867 } 2868} 2869 2870#endif // PRODUCT 2871 2872const char* nmethod::reloc_string_for(u_char* begin, u_char* end) { 2873 RelocIterator iter(this, begin, end); 2874 bool have_one = false; 2875 while (iter.next()) { 2876 have_one = true; 2877 switch (iter.type()) { 2878 case relocInfo::none: return "no_reloc"; 2879 case relocInfo::oop_type: { 2880 stringStream st; 2881 oop_Relocation* r = iter.oop_reloc(); 2882 oop obj = r->oop_value(); 2883 st.print("oop("); 2884 if (obj == NULL) st.print("NULL"); 2885 else obj->print_value_on(&st); 2886 st.print(")"); 2887 return st.as_string(); 2888 } 2889 case relocInfo::metadata_type: { 2890 stringStream st; 2891 metadata_Relocation* r = iter.metadata_reloc(); 2892 Metadata* obj = r->metadata_value(); 2893 st.print("metadata("); 2894 if (obj == NULL) st.print("NULL"); 2895 else obj->print_value_on(&st); 2896 st.print(")"); 2897 return st.as_string(); 2898 } 2899 case relocInfo::virtual_call_type: return "virtual_call"; 2900 case relocInfo::opt_virtual_call_type: return "optimized virtual_call"; 2901 case relocInfo::static_call_type: return "static_call"; 2902 case relocInfo::static_stub_type: return "static_stub"; 2903 case relocInfo::runtime_call_type: return "runtime_call"; 2904 case relocInfo::external_word_type: return "external_word"; 2905 case relocInfo::internal_word_type: return "internal_word"; 2906 case relocInfo::section_word_type: return "section_word"; 2907 case relocInfo::poll_type: return "poll"; 2908 case relocInfo::poll_return_type: return "poll_return"; 2909 case relocInfo::type_mask: return "type_bit_mask"; 2910 } 2911 } 2912 return have_one ? "other" : NULL; 2913} 2914 2915// Return a the last scope in (begin..end] 2916ScopeDesc* nmethod::scope_desc_in(address begin, address end) { 2917 PcDesc* p = pc_desc_near(begin+1); 2918 if (p != NULL && p->real_pc(this) <= end) { 2919 return new ScopeDesc(this, p->scope_decode_offset(), 2920 p->obj_decode_offset(), p->should_reexecute(), 2921 p->return_oop()); 2922 } 2923 return NULL; 2924} 2925 2926void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const { 2927 if (block_begin == entry_point()) stream->print_cr("[Entry Point]"); 2928 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]"); 2929 if (block_begin == exception_begin()) stream->print_cr("[Exception Handler]"); 2930 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]"); 2931 if (block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]"); 2932 2933 if (has_method_handle_invokes()) 2934 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]"); 2935 2936 if (block_begin == consts_begin()) stream->print_cr("[Constants]"); 2937 2938 if (block_begin == entry_point()) { 2939 methodHandle m = method(); 2940 if (m.not_null()) { 2941 stream->print(" # "); 2942 m->print_value_on(stream); 2943 stream->cr(); 2944 } 2945 if (m.not_null() && !is_osr_method()) { 2946 ResourceMark rm; 2947 int sizeargs = m->size_of_parameters(); 2948 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs); 2949 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs); 2950 { 2951 int sig_index = 0; 2952 if (!m->is_static()) 2953 sig_bt[sig_index++] = T_OBJECT; // 'this' 2954 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) { 2955 BasicType t = ss.type(); 2956 sig_bt[sig_index++] = t; 2957 if (type2size[t] == 2) { 2958 sig_bt[sig_index++] = T_VOID; 2959 } else { 2960 assert(type2size[t] == 1, "size is 1 or 2"); 2961 } 2962 } 2963 assert(sig_index == sizeargs, ""); 2964 } 2965 const char* spname = "sp"; // make arch-specific? 2966 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false); 2967 int stack_slot_offset = this->frame_size() * wordSize; 2968 int tab1 = 14, tab2 = 24; 2969 int sig_index = 0; 2970 int arg_index = (m->is_static() ? 0 : -1); 2971 bool did_old_sp = false; 2972 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) { 2973 bool at_this = (arg_index == -1); 2974 bool at_old_sp = false; 2975 BasicType t = (at_this ? T_OBJECT : ss.type()); 2976 assert(t == sig_bt[sig_index], "sigs in sync"); 2977 if (at_this) 2978 stream->print(" # this: "); 2979 else 2980 stream->print(" # parm%d: ", arg_index); 2981 stream->move_to(tab1); 2982 VMReg fst = regs[sig_index].first(); 2983 VMReg snd = regs[sig_index].second(); 2984 if (fst->is_reg()) { 2985 stream->print("%s", fst->name()); 2986 if (snd->is_valid()) { 2987 stream->print(":%s", snd->name()); 2988 } 2989 } else if (fst->is_stack()) { 2990 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset; 2991 if (offset == stack_slot_offset) at_old_sp = true; 2992 stream->print("[%s+0x%x]", spname, offset); 2993 } else { 2994 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd); 2995 } 2996 stream->print(" "); 2997 stream->move_to(tab2); 2998 stream->print("= "); 2999 if (at_this) { 3000 m->method_holder()->print_value_on(stream); 3001 } else { 3002 bool did_name = false; 3003 if (!at_this && ss.is_object()) { 3004 Symbol* name = ss.as_symbol_or_null(); 3005 if (name != NULL) { 3006 name->print_value_on(stream); 3007 did_name = true; 3008 } 3009 } 3010 if (!did_name) 3011 stream->print("%s", type2name(t)); 3012 } 3013 if (at_old_sp) { 3014 stream->print(" (%s of caller)", spname); 3015 did_old_sp = true; 3016 } 3017 stream->cr(); 3018 sig_index += type2size[t]; 3019 arg_index += 1; 3020 if (!at_this) ss.next(); 3021 } 3022 if (!did_old_sp) { 3023 stream->print(" # "); 3024 stream->move_to(tab1); 3025 stream->print("[%s+0x%x]", spname, stack_slot_offset); 3026 stream->print(" (%s of caller)", spname); 3027 stream->cr(); 3028 } 3029 } 3030 } 3031} 3032 3033void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) { 3034 // First, find an oopmap in (begin, end]. 3035 // We use the odd half-closed interval so that oop maps and scope descs 3036 // which are tied to the byte after a call are printed with the call itself. 3037 address base = code_begin(); 3038 OopMapSet* oms = oop_maps(); 3039 if (oms != NULL) { 3040 for (int i = 0, imax = oms->size(); i < imax; i++) { 3041 OopMap* om = oms->at(i); 3042 address pc = base + om->offset(); 3043 if (pc > begin) { 3044 if (pc <= end) { 3045 st->move_to(column); 3046 st->print("; "); 3047 om->print_on(st); 3048 } 3049 break; 3050 } 3051 } 3052 } 3053 3054 // Print any debug info present at this pc. 3055 ScopeDesc* sd = scope_desc_in(begin, end); 3056 if (sd != NULL) { 3057 st->move_to(column); 3058 if (sd->bci() == SynchronizationEntryBCI) { 3059 st->print(";*synchronization entry"); 3060 } else { 3061 if (sd->method() == NULL) { 3062 st->print("method is NULL"); 3063 } else if (sd->method()->is_native()) { 3064 st->print("method is native"); 3065 } else { 3066 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci()); 3067 st->print(";*%s", Bytecodes::name(bc)); 3068 switch (bc) { 3069 case Bytecodes::_invokevirtual: 3070 case Bytecodes::_invokespecial: 3071 case Bytecodes::_invokestatic: 3072 case Bytecodes::_invokeinterface: 3073 { 3074 Bytecode_invoke invoke(sd->method(), sd->bci()); 3075 st->print(" "); 3076 if (invoke.name() != NULL) 3077 invoke.name()->print_symbol_on(st); 3078 else 3079 st->print("<UNKNOWN>"); 3080 break; 3081 } 3082 case Bytecodes::_getfield: 3083 case Bytecodes::_putfield: 3084 case Bytecodes::_getstatic: 3085 case Bytecodes::_putstatic: 3086 { 3087 Bytecode_field field(sd->method(), sd->bci()); 3088 st->print(" "); 3089 if (field.name() != NULL) 3090 field.name()->print_symbol_on(st); 3091 else 3092 st->print("<UNKNOWN>"); 3093 } 3094 } 3095 } 3096 } 3097 3098 // Print all scopes 3099 for (;sd != NULL; sd = sd->sender()) { 3100 st->move_to(column); 3101 st->print("; -"); 3102 if (sd->method() == NULL) { 3103 st->print("method is NULL"); 3104 } else { 3105 sd->method()->print_short_name(st); 3106 } 3107 int lineno = sd->method()->line_number_from_bci(sd->bci()); 3108 if (lineno != -1) { 3109 st->print("@%d (line %d)", sd->bci(), lineno); 3110 } else { 3111 st->print("@%d", sd->bci()); 3112 } 3113 st->cr(); 3114 } 3115 } 3116 3117 // Print relocation information 3118 const char* str = reloc_string_for(begin, end); 3119 if (str != NULL) { 3120 if (sd != NULL) st->cr(); 3121 st->move_to(column); 3122 st->print("; {%s}", str); 3123 } 3124 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin()); 3125 if (cont_offset != 0) { 3126 st->move_to(column); 3127 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, code_begin() + cont_offset); 3128 } 3129 3130} 3131 3132#ifndef PRODUCT 3133 3134void nmethod::print_value_on(outputStream* st) const { 3135 st->print("nmethod"); 3136 print_on(st, NULL); 3137} 3138 3139void nmethod::print_calls(outputStream* st) { 3140 RelocIterator iter(this); 3141 while (iter.next()) { 3142 switch (iter.type()) { 3143 case relocInfo::virtual_call_type: 3144 case relocInfo::opt_virtual_call_type: { 3145 VerifyMutexLocker mc(CompiledIC_lock); 3146 CompiledIC_at(&iter)->print(); 3147 break; 3148 } 3149 case relocInfo::static_call_type: 3150 st->print_cr("Static call at " INTPTR_FORMAT, iter.reloc()->addr()); 3151 compiledStaticCall_at(iter.reloc())->print(); 3152 break; 3153 } 3154 } 3155} 3156 3157void nmethod::print_handler_table() { 3158 ExceptionHandlerTable(this).print(); 3159} 3160 3161void nmethod::print_nul_chk_table() { 3162 ImplicitExceptionTable(this).print(code_begin()); 3163} 3164 3165void nmethod::print_statistics() { 3166 ttyLocker ttyl; 3167 if (xtty != NULL) xtty->head("statistics type='nmethod'"); 3168 nmethod_stats.print_native_nmethod_stats(); 3169 nmethod_stats.print_nmethod_stats(); 3170 DebugInformationRecorder::print_statistics(); 3171 nmethod_stats.print_pc_stats(); 3172 Dependencies::print_statistics(); 3173 if (xtty != NULL) xtty->tail("statistics"); 3174} 3175 3176#endif // PRODUCT 3177