nmethod.cpp revision 2062:3582bf76420e
1/* 2 * Copyright (c) 1997, 2011, 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/nmethod.hpp" 29#include "code/scopeDesc.hpp" 30#include "compiler/abstractCompiler.hpp" 31#include "compiler/compileLog.hpp" 32#include "compiler/compilerOracle.hpp" 33#include "compiler/disassembler.hpp" 34#include "interpreter/bytecode.hpp" 35#include "oops/methodDataOop.hpp" 36#include "prims/jvmtiRedefineClassesTrace.hpp" 37#include "runtime/sharedRuntime.hpp" 38#include "runtime/sweeper.hpp" 39#include "utilities/dtrace.hpp" 40#include "utilities/events.hpp" 41#include "utilities/xmlstream.hpp" 42#ifdef SHARK 43#include "shark/sharkCompiler.hpp" 44#endif 45 46#ifdef DTRACE_ENABLED 47 48// Only bother with this argument setup if dtrace is available 49 50HS_DTRACE_PROBE_DECL8(hotspot, compiled__method__load, 51 const char*, int, const char*, int, const char*, int, void*, size_t); 52 53HS_DTRACE_PROBE_DECL6(hotspot, compiled__method__unload, 54 char*, int, char*, int, char*, int); 55 56#define DTRACE_METHOD_UNLOAD_PROBE(method) \ 57 { \ 58 methodOop m = (method); \ 59 if (m != NULL) { \ 60 Symbol* klass_name = m->klass_name(); \ 61 Symbol* name = m->name(); \ 62 Symbol* signature = m->signature(); \ 63 HS_DTRACE_PROBE6(hotspot, compiled__method__unload, \ 64 klass_name->bytes(), klass_name->utf8_length(), \ 65 name->bytes(), name->utf8_length(), \ 66 signature->bytes(), signature->utf8_length()); \ 67 } \ 68 } 69 70#else // ndef DTRACE_ENABLED 71 72#define DTRACE_METHOD_UNLOAD_PROBE(method) 73 74#endif 75 76bool nmethod::is_compiled_by_c1() const { 77 if (compiler() == NULL || method() == NULL) return false; // can happen during debug printing 78 if (is_native_method()) return false; 79 return compiler()->is_c1(); 80} 81bool nmethod::is_compiled_by_c2() const { 82 if (compiler() == NULL || method() == NULL) return false; // can happen during debug printing 83 if (is_native_method()) return false; 84 return compiler()->is_c2(); 85} 86bool nmethod::is_compiled_by_shark() const { 87 if (is_native_method()) return false; 88 assert(compiler() != NULL, "must be"); 89 return compiler()->is_shark(); 90} 91 92 93 94//--------------------------------------------------------------------------------- 95// NMethod statistics 96// They are printed under various flags, including: 97// PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation. 98// (In the latter two cases, they like other stats are printed to the log only.) 99 100#ifndef PRODUCT 101// These variables are put into one block to reduce relocations 102// and make it simpler to print from the debugger. 103static 104struct nmethod_stats_struct { 105 int nmethod_count; 106 int total_size; 107 int relocation_size; 108 int consts_size; 109 int insts_size; 110 int stub_size; 111 int scopes_data_size; 112 int scopes_pcs_size; 113 int dependencies_size; 114 int handler_table_size; 115 int nul_chk_table_size; 116 int oops_size; 117 118 void note_nmethod(nmethod* nm) { 119 nmethod_count += 1; 120 total_size += nm->size(); 121 relocation_size += nm->relocation_size(); 122 consts_size += nm->consts_size(); 123 insts_size += nm->insts_size(); 124 stub_size += nm->stub_size(); 125 oops_size += nm->oops_size(); 126 scopes_data_size += nm->scopes_data_size(); 127 scopes_pcs_size += nm->scopes_pcs_size(); 128 dependencies_size += nm->dependencies_size(); 129 handler_table_size += nm->handler_table_size(); 130 nul_chk_table_size += nm->nul_chk_table_size(); 131 } 132 void print_nmethod_stats() { 133 if (nmethod_count == 0) return; 134 tty->print_cr("Statistics for %d bytecoded nmethods:", nmethod_count); 135 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size); 136 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size); 137 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size); 138 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size); 139 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size); 140 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size); 141 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size); 142 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size); 143 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size); 144 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size); 145 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size); 146 } 147 148 int native_nmethod_count; 149 int native_total_size; 150 int native_relocation_size; 151 int native_insts_size; 152 int native_oops_size; 153 void note_native_nmethod(nmethod* nm) { 154 native_nmethod_count += 1; 155 native_total_size += nm->size(); 156 native_relocation_size += nm->relocation_size(); 157 native_insts_size += nm->insts_size(); 158 native_oops_size += nm->oops_size(); 159 } 160 void print_native_nmethod_stats() { 161 if (native_nmethod_count == 0) return; 162 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count); 163 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size); 164 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size); 165 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size); 166 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size); 167 } 168 169 int pc_desc_resets; // number of resets (= number of caches) 170 int pc_desc_queries; // queries to nmethod::find_pc_desc 171 int pc_desc_approx; // number of those which have approximate true 172 int pc_desc_repeats; // number of _last_pc_desc hits 173 int pc_desc_hits; // number of LRU cache hits 174 int pc_desc_tests; // total number of PcDesc examinations 175 int pc_desc_searches; // total number of quasi-binary search steps 176 int pc_desc_adds; // number of LUR cache insertions 177 178 void print_pc_stats() { 179 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query", 180 pc_desc_queries, 181 (double)(pc_desc_tests + pc_desc_searches) 182 / pc_desc_queries); 183 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d", 184 pc_desc_resets, 185 pc_desc_queries, pc_desc_approx, 186 pc_desc_repeats, pc_desc_hits, 187 pc_desc_tests, pc_desc_searches, pc_desc_adds); 188 } 189} nmethod_stats; 190#endif //PRODUCT 191 192//--------------------------------------------------------------------------------- 193 194 195// The _unwind_handler is a special marker address, which says that 196// for given exception oop and address, the frame should be removed 197// as the tuple cannot be caught in the nmethod 198address ExceptionCache::_unwind_handler = (address) -1; 199 200 201ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) { 202 assert(pc != NULL, "Must be non null"); 203 assert(exception.not_null(), "Must be non null"); 204 assert(handler != NULL, "Must be non null"); 205 206 _count = 0; 207 _exception_type = exception->klass(); 208 _next = NULL; 209 210 add_address_and_handler(pc,handler); 211} 212 213 214address ExceptionCache::match(Handle exception, address pc) { 215 assert(pc != NULL,"Must be non null"); 216 assert(exception.not_null(),"Must be non null"); 217 if (exception->klass() == exception_type()) { 218 return (test_address(pc)); 219 } 220 221 return NULL; 222} 223 224 225bool ExceptionCache::match_exception_with_space(Handle exception) { 226 assert(exception.not_null(),"Must be non null"); 227 if (exception->klass() == exception_type() && count() < cache_size) { 228 return true; 229 } 230 return false; 231} 232 233 234address ExceptionCache::test_address(address addr) { 235 for (int i=0; i<count(); i++) { 236 if (pc_at(i) == addr) { 237 return handler_at(i); 238 } 239 } 240 return NULL; 241} 242 243 244bool ExceptionCache::add_address_and_handler(address addr, address handler) { 245 if (test_address(addr) == handler) return true; 246 if (count() < cache_size) { 247 set_pc_at(count(),addr); 248 set_handler_at(count(), handler); 249 increment_count(); 250 return true; 251 } 252 return false; 253} 254 255 256// private method for handling exception cache 257// These methods are private, and used to manipulate the exception cache 258// directly. 259ExceptionCache* nmethod::exception_cache_entry_for_exception(Handle exception) { 260 ExceptionCache* ec = exception_cache(); 261 while (ec != NULL) { 262 if (ec->match_exception_with_space(exception)) { 263 return ec; 264 } 265 ec = ec->next(); 266 } 267 return NULL; 268} 269 270 271//----------------------------------------------------------------------------- 272 273 274// Helper used by both find_pc_desc methods. 275static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) { 276 NOT_PRODUCT(++nmethod_stats.pc_desc_tests); 277 if (!approximate) 278 return pc->pc_offset() == pc_offset; 279 else 280 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset(); 281} 282 283void PcDescCache::reset_to(PcDesc* initial_pc_desc) { 284 if (initial_pc_desc == NULL) { 285 _last_pc_desc = NULL; // native method 286 return; 287 } 288 NOT_PRODUCT(++nmethod_stats.pc_desc_resets); 289 // reset the cache by filling it with benign (non-null) values 290 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel"); 291 _last_pc_desc = initial_pc_desc + 1; // first valid one is after sentinel 292 for (int i = 0; i < cache_size; i++) 293 _pc_descs[i] = initial_pc_desc; 294} 295 296PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) { 297 NOT_PRODUCT(++nmethod_stats.pc_desc_queries); 298 NOT_PRODUCT(if (approximate) ++nmethod_stats.pc_desc_approx); 299 300 // In order to prevent race conditions do not load cache elements 301 // repeatedly, but use a local copy: 302 PcDesc* res; 303 304 // Step one: Check the most recently returned value. 305 res = _last_pc_desc; 306 if (res == NULL) return NULL; // native method; no PcDescs at all 307 if (match_desc(res, pc_offset, approximate)) { 308 NOT_PRODUCT(++nmethod_stats.pc_desc_repeats); 309 return res; 310 } 311 312 // Step two: Check the LRU cache. 313 for (int i = 0; i < cache_size; i++) { 314 res = _pc_descs[i]; 315 if (res->pc_offset() < 0) break; // optimization: skip empty cache 316 if (match_desc(res, pc_offset, approximate)) { 317 NOT_PRODUCT(++nmethod_stats.pc_desc_hits); 318 _last_pc_desc = res; // record this cache hit in case of repeat 319 return res; 320 } 321 } 322 323 // Report failure. 324 return NULL; 325} 326 327void PcDescCache::add_pc_desc(PcDesc* pc_desc) { 328 NOT_PRODUCT(++nmethod_stats.pc_desc_adds); 329 // Update the LRU cache by shifting pc_desc forward: 330 for (int i = 0; i < cache_size; i++) { 331 PcDesc* next = _pc_descs[i]; 332 _pc_descs[i] = pc_desc; 333 pc_desc = next; 334 } 335 // Note: Do not update _last_pc_desc. It fronts for the LRU cache. 336} 337 338// adjust pcs_size so that it is a multiple of both oopSize and 339// sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple 340// of oopSize, then 2*sizeof(PcDesc) is) 341static int adjust_pcs_size(int pcs_size) { 342 int nsize = round_to(pcs_size, oopSize); 343 if ((nsize % sizeof(PcDesc)) != 0) { 344 nsize = pcs_size + sizeof(PcDesc); 345 } 346 assert((nsize % oopSize) == 0, "correct alignment"); 347 return nsize; 348} 349 350//----------------------------------------------------------------------------- 351 352 353void nmethod::add_exception_cache_entry(ExceptionCache* new_entry) { 354 assert(ExceptionCache_lock->owned_by_self(),"Must hold the ExceptionCache_lock"); 355 assert(new_entry != NULL,"Must be non null"); 356 assert(new_entry->next() == NULL, "Must be null"); 357 358 if (exception_cache() != NULL) { 359 new_entry->set_next(exception_cache()); 360 } 361 set_exception_cache(new_entry); 362} 363 364void nmethod::remove_from_exception_cache(ExceptionCache* ec) { 365 ExceptionCache* prev = NULL; 366 ExceptionCache* curr = exception_cache(); 367 assert(curr != NULL, "nothing to remove"); 368 // find the previous and next entry of ec 369 while (curr != ec) { 370 prev = curr; 371 curr = curr->next(); 372 assert(curr != NULL, "ExceptionCache not found"); 373 } 374 // now: curr == ec 375 ExceptionCache* next = curr->next(); 376 if (prev == NULL) { 377 set_exception_cache(next); 378 } else { 379 prev->set_next(next); 380 } 381 delete curr; 382} 383 384 385// public method for accessing the exception cache 386// These are the public access methods. 387address nmethod::handler_for_exception_and_pc(Handle exception, address pc) { 388 // We never grab a lock to read the exception cache, so we may 389 // have false negatives. This is okay, as it can only happen during 390 // the first few exception lookups for a given nmethod. 391 ExceptionCache* ec = exception_cache(); 392 while (ec != NULL) { 393 address ret_val; 394 if ((ret_val = ec->match(exception,pc)) != NULL) { 395 return ret_val; 396 } 397 ec = ec->next(); 398 } 399 return NULL; 400} 401 402 403void nmethod::add_handler_for_exception_and_pc(Handle exception, address pc, address handler) { 404 // There are potential race conditions during exception cache updates, so we 405 // must own the ExceptionCache_lock before doing ANY modifications. Because 406 // we don't lock during reads, it is possible to have several threads attempt 407 // to update the cache with the same data. We need to check for already inserted 408 // copies of the current data before adding it. 409 410 MutexLocker ml(ExceptionCache_lock); 411 ExceptionCache* target_entry = exception_cache_entry_for_exception(exception); 412 413 if (target_entry == NULL || !target_entry->add_address_and_handler(pc,handler)) { 414 target_entry = new ExceptionCache(exception,pc,handler); 415 add_exception_cache_entry(target_entry); 416 } 417} 418 419 420//-------------end of code for ExceptionCache-------------- 421 422 423int nmethod::total_size() const { 424 return 425 consts_size() + 426 insts_size() + 427 stub_size() + 428 scopes_data_size() + 429 scopes_pcs_size() + 430 handler_table_size() + 431 nul_chk_table_size(); 432} 433 434const char* nmethod::compile_kind() const { 435 if (is_osr_method()) return "osr"; 436 if (method() != NULL && is_native_method()) return "c2n"; 437 return NULL; 438} 439 440// Fill in default values for various flag fields 441void nmethod::init_defaults() { 442 _state = alive; 443 _marked_for_reclamation = 0; 444 _has_flushed_dependencies = 0; 445 _speculatively_disconnected = 0; 446 _has_unsafe_access = 0; 447 _has_method_handle_invokes = 0; 448 _marked_for_deoptimization = 0; 449 _lock_count = 0; 450 _stack_traversal_mark = 0; 451 _unload_reported = false; // jvmti state 452 453 NOT_PRODUCT(_has_debug_info = false); 454#ifdef ASSERT 455 _oops_are_stale = false; 456#endif 457 458 _oops_do_mark_link = NULL; 459 _jmethod_id = NULL; 460 _osr_link = NULL; 461 _scavenge_root_link = NULL; 462 _scavenge_root_state = 0; 463 _saved_nmethod_link = NULL; 464 _compiler = NULL; 465 466#ifdef HAVE_DTRACE_H 467 _trap_offset = 0; 468#endif // def HAVE_DTRACE_H 469} 470 471 472nmethod* nmethod::new_native_nmethod(methodHandle method, 473 CodeBuffer *code_buffer, 474 int vep_offset, 475 int frame_complete, 476 int frame_size, 477 ByteSize basic_lock_owner_sp_offset, 478 ByteSize basic_lock_sp_offset, 479 OopMapSet* oop_maps) { 480 // create nmethod 481 nmethod* nm = NULL; 482 { 483 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 484 int native_nmethod_size = allocation_size(code_buffer, sizeof(nmethod)); 485 CodeOffsets offsets; 486 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset); 487 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete); 488 nm = new (native_nmethod_size) 489 nmethod(method(), native_nmethod_size, &offsets, 490 code_buffer, frame_size, 491 basic_lock_owner_sp_offset, basic_lock_sp_offset, 492 oop_maps); 493 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_native_nmethod(nm)); 494 if (PrintAssembly && nm != NULL) 495 Disassembler::decode(nm); 496 } 497 // verify nmethod 498 debug_only(if (nm) nm->verify();) // might block 499 500 if (nm != NULL) { 501 nm->log_new_nmethod(); 502 } 503 504 return nm; 505} 506 507#ifdef HAVE_DTRACE_H 508nmethod* nmethod::new_dtrace_nmethod(methodHandle method, 509 CodeBuffer *code_buffer, 510 int vep_offset, 511 int trap_offset, 512 int frame_complete, 513 int frame_size) { 514 // create nmethod 515 nmethod* nm = NULL; 516 { 517 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 518 int nmethod_size = allocation_size(code_buffer, sizeof(nmethod)); 519 CodeOffsets offsets; 520 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset); 521 offsets.set_value(CodeOffsets::Dtrace_trap, trap_offset); 522 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete); 523 524 nm = new (nmethod_size) nmethod(method(), nmethod_size, &offsets, code_buffer, frame_size); 525 526 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_nmethod(nm)); 527 if (PrintAssembly && nm != NULL) 528 Disassembler::decode(nm); 529 } 530 // verify nmethod 531 debug_only(if (nm) nm->verify();) // might block 532 533 if (nm != NULL) { 534 nm->log_new_nmethod(); 535 } 536 537 return nm; 538} 539 540#endif // def HAVE_DTRACE_H 541 542nmethod* nmethod::new_nmethod(methodHandle method, 543 int compile_id, 544 int entry_bci, 545 CodeOffsets* offsets, 546 int orig_pc_offset, 547 DebugInformationRecorder* debug_info, 548 Dependencies* dependencies, 549 CodeBuffer* code_buffer, int frame_size, 550 OopMapSet* oop_maps, 551 ExceptionHandlerTable* handler_table, 552 ImplicitExceptionTable* nul_chk_table, 553 AbstractCompiler* compiler, 554 int comp_level 555) 556{ 557 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); 558 // create nmethod 559 nmethod* nm = NULL; 560 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 561 int nmethod_size = 562 allocation_size(code_buffer, sizeof(nmethod)) 563 + adjust_pcs_size(debug_info->pcs_size()) 564 + round_to(dependencies->size_in_bytes() , oopSize) 565 + round_to(handler_table->size_in_bytes(), oopSize) 566 + round_to(nul_chk_table->size_in_bytes(), oopSize) 567 + round_to(debug_info->data_size() , oopSize); 568 nm = new (nmethod_size) 569 nmethod(method(), nmethod_size, compile_id, entry_bci, offsets, 570 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size, 571 oop_maps, 572 handler_table, 573 nul_chk_table, 574 compiler, 575 comp_level); 576 if (nm != NULL) { 577 // To make dependency checking during class loading fast, record 578 // the nmethod dependencies in the classes it is dependent on. 579 // This allows the dependency checking code to simply walk the 580 // class hierarchy above the loaded class, checking only nmethods 581 // which are dependent on those classes. The slow way is to 582 // check every nmethod for dependencies which makes it linear in 583 // the number of methods compiled. For applications with a lot 584 // classes the slow way is too slow. 585 for (Dependencies::DepStream deps(nm); deps.next(); ) { 586 klassOop klass = deps.context_type(); 587 if (klass == NULL) continue; // ignore things like evol_method 588 589 // record this nmethod as dependent on this klass 590 instanceKlass::cast(klass)->add_dependent_nmethod(nm); 591 } 592 } 593 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_nmethod(nm)); 594 if (PrintAssembly && nm != NULL) 595 Disassembler::decode(nm); 596 } 597 598 // verify nmethod 599 debug_only(if (nm) nm->verify();) // might block 600 601 if (nm != NULL) { 602 nm->log_new_nmethod(); 603 } 604 605 // done 606 return nm; 607} 608 609 610// For native wrappers 611nmethod::nmethod( 612 methodOop method, 613 int nmethod_size, 614 CodeOffsets* offsets, 615 CodeBuffer* code_buffer, 616 int frame_size, 617 ByteSize basic_lock_owner_sp_offset, 618 ByteSize basic_lock_sp_offset, 619 OopMapSet* oop_maps ) 620 : CodeBlob("native nmethod", code_buffer, sizeof(nmethod), 621 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps), 622 _native_receiver_sp_offset(basic_lock_owner_sp_offset), 623 _native_basic_lock_sp_offset(basic_lock_sp_offset) 624{ 625 { 626 debug_only(No_Safepoint_Verifier nsv;) 627 assert_locked_or_safepoint(CodeCache_lock); 628 629 init_defaults(); 630 _method = method; 631 _entry_bci = InvocationEntryBci; 632 // We have no exception handler or deopt handler make the 633 // values something that will never match a pc like the nmethod vtable entry 634 _exception_offset = 0; 635 _deoptimize_offset = 0; 636 _deoptimize_mh_offset = 0; 637 _orig_pc_offset = 0; 638 639 _consts_offset = data_offset(); 640 _stub_offset = data_offset(); 641 _oops_offset = data_offset(); 642 _scopes_data_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize); 643 _scopes_pcs_offset = _scopes_data_offset; 644 _dependencies_offset = _scopes_pcs_offset; 645 _handler_table_offset = _dependencies_offset; 646 _nul_chk_table_offset = _handler_table_offset; 647 _nmethod_end_offset = _nul_chk_table_offset; 648 _compile_id = 0; // default 649 _comp_level = CompLevel_none; 650 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 651 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 652 _osr_entry_point = NULL; 653 _exception_cache = NULL; 654 _pc_desc_cache.reset_to(NULL); 655 656 code_buffer->copy_oops_to(this); 657 debug_only(verify_scavenge_root_oops()); 658 CodeCache::commit(this); 659 } 660 661 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) { 662 ttyLocker ttyl; // keep the following output all in one block 663 // This output goes directly to the tty, not the compiler log. 664 // To enable tools to match it up with the compilation activity, 665 // be sure to tag this tty output with the compile ID. 666 if (xtty != NULL) { 667 xtty->begin_head("print_native_nmethod"); 668 xtty->method(_method); 669 xtty->stamp(); 670 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this); 671 } 672 // print the header part first 673 print(); 674 // then print the requested information 675 if (PrintNativeNMethods) { 676 print_code(); 677 oop_maps->print(); 678 } 679 if (PrintRelocations) { 680 print_relocations(); 681 } 682 if (xtty != NULL) { 683 xtty->tail("print_native_nmethod"); 684 } 685 } 686 Events::log("Create nmethod " INTPTR_FORMAT, this); 687} 688 689// For dtrace wrappers 690#ifdef HAVE_DTRACE_H 691nmethod::nmethod( 692 methodOop method, 693 int nmethod_size, 694 CodeOffsets* offsets, 695 CodeBuffer* code_buffer, 696 int frame_size) 697 : CodeBlob("dtrace nmethod", code_buffer, sizeof(nmethod), 698 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, NULL), 699 _native_receiver_sp_offset(in_ByteSize(-1)), 700 _native_basic_lock_sp_offset(in_ByteSize(-1)) 701{ 702 { 703 debug_only(No_Safepoint_Verifier nsv;) 704 assert_locked_or_safepoint(CodeCache_lock); 705 706 init_defaults(); 707 _method = method; 708 _entry_bci = InvocationEntryBci; 709 // We have no exception handler or deopt handler make the 710 // values something that will never match a pc like the nmethod vtable entry 711 _exception_offset = 0; 712 _deoptimize_offset = 0; 713 _deoptimize_mh_offset = 0; 714 _unwind_handler_offset = -1; 715 _trap_offset = offsets->value(CodeOffsets::Dtrace_trap); 716 _orig_pc_offset = 0; 717 _consts_offset = data_offset(); 718 _stub_offset = data_offset(); 719 _oops_offset = data_offset(); 720 _scopes_data_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize); 721 _scopes_pcs_offset = _scopes_data_offset; 722 _dependencies_offset = _scopes_pcs_offset; 723 _handler_table_offset = _dependencies_offset; 724 _nul_chk_table_offset = _handler_table_offset; 725 _nmethod_end_offset = _nul_chk_table_offset; 726 _compile_id = 0; // default 727 _comp_level = CompLevel_none; 728 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 729 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 730 _osr_entry_point = NULL; 731 _exception_cache = NULL; 732 _pc_desc_cache.reset_to(NULL); 733 734 code_buffer->copy_oops_to(this); 735 debug_only(verify_scavenge_root_oops()); 736 CodeCache::commit(this); 737 } 738 739 if (PrintNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) { 740 ttyLocker ttyl; // keep the following output all in one block 741 // This output goes directly to the tty, not the compiler log. 742 // To enable tools to match it up with the compilation activity, 743 // be sure to tag this tty output with the compile ID. 744 if (xtty != NULL) { 745 xtty->begin_head("print_dtrace_nmethod"); 746 xtty->method(_method); 747 xtty->stamp(); 748 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this); 749 } 750 // print the header part first 751 print(); 752 // then print the requested information 753 if (PrintNMethods) { 754 print_code(); 755 } 756 if (PrintRelocations) { 757 print_relocations(); 758 } 759 if (xtty != NULL) { 760 xtty->tail("print_dtrace_nmethod"); 761 } 762 } 763 Events::log("Create nmethod " INTPTR_FORMAT, this); 764} 765#endif // def HAVE_DTRACE_H 766 767void* nmethod::operator new(size_t size, int nmethod_size) { 768 // Always leave some room in the CodeCache for I2C/C2I adapters 769 if (CodeCache::unallocated_capacity() < CodeCacheMinimumFreeSpace) return NULL; 770 return CodeCache::allocate(nmethod_size); 771} 772 773 774nmethod::nmethod( 775 methodOop method, 776 int nmethod_size, 777 int compile_id, 778 int entry_bci, 779 CodeOffsets* offsets, 780 int orig_pc_offset, 781 DebugInformationRecorder* debug_info, 782 Dependencies* dependencies, 783 CodeBuffer *code_buffer, 784 int frame_size, 785 OopMapSet* oop_maps, 786 ExceptionHandlerTable* handler_table, 787 ImplicitExceptionTable* nul_chk_table, 788 AbstractCompiler* compiler, 789 int comp_level 790 ) 791 : CodeBlob("nmethod", code_buffer, sizeof(nmethod), 792 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps), 793 _native_receiver_sp_offset(in_ByteSize(-1)), 794 _native_basic_lock_sp_offset(in_ByteSize(-1)) 795{ 796 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); 797 { 798 debug_only(No_Safepoint_Verifier nsv;) 799 assert_locked_or_safepoint(CodeCache_lock); 800 801 init_defaults(); 802 _method = method; 803 _entry_bci = entry_bci; 804 _compile_id = compile_id; 805 _comp_level = comp_level; 806 _compiler = compiler; 807 _orig_pc_offset = orig_pc_offset; 808 809 // Section offsets 810 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts()); 811 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs()); 812 813 // Exception handler and deopt handler are in the stub section 814 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set"); 815 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set"); 816 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions); 817 _deoptimize_offset = _stub_offset + offsets->value(CodeOffsets::Deopt); 818 if (offsets->value(CodeOffsets::DeoptMH) != -1) { 819 _deoptimize_mh_offset = _stub_offset + offsets->value(CodeOffsets::DeoptMH); 820 } else { 821 _deoptimize_mh_offset = -1; 822 } 823 if (offsets->value(CodeOffsets::UnwindHandler) != -1) { 824 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler); 825 } else { 826 _unwind_handler_offset = -1; 827 } 828 829 _oops_offset = data_offset(); 830 _scopes_data_offset = _oops_offset + round_to(code_buffer->total_oop_size (), oopSize); 831 _scopes_pcs_offset = _scopes_data_offset + round_to(debug_info->data_size (), oopSize); 832 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size()); 833 _handler_table_offset = _dependencies_offset + round_to(dependencies->size_in_bytes (), oopSize); 834 _nul_chk_table_offset = _handler_table_offset + round_to(handler_table->size_in_bytes(), oopSize); 835 _nmethod_end_offset = _nul_chk_table_offset + round_to(nul_chk_table->size_in_bytes(), oopSize); 836 837 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 838 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 839 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry); 840 _exception_cache = NULL; 841 _pc_desc_cache.reset_to(scopes_pcs_begin()); 842 843 // Copy contents of ScopeDescRecorder to nmethod 844 code_buffer->copy_oops_to(this); 845 debug_info->copy_to(this); 846 dependencies->copy_to(this); 847 if (ScavengeRootsInCode && detect_scavenge_root_oops()) { 848 CodeCache::add_scavenge_root_nmethod(this); 849 } 850 debug_only(verify_scavenge_root_oops()); 851 852 CodeCache::commit(this); 853 854 // Copy contents of ExceptionHandlerTable to nmethod 855 handler_table->copy_to(this); 856 nul_chk_table->copy_to(this); 857 858 // we use the information of entry points to find out if a method is 859 // static or non static 860 assert(compiler->is_c2() || 861 _method->is_static() == (entry_point() == _verified_entry_point), 862 " entry points must be same for static methods and vice versa"); 863 } 864 865 bool printnmethods = PrintNMethods 866 || CompilerOracle::should_print(_method) 867 || CompilerOracle::has_option_string(_method, "PrintNMethods"); 868 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) { 869 print_nmethod(printnmethods); 870 } 871 872 // Note: Do not verify in here as the CodeCache_lock is 873 // taken which would conflict with the CompiledIC_lock 874 // which taken during the verification of call sites. 875 // (was bug - gri 10/25/99) 876 877 Events::log("Create nmethod " INTPTR_FORMAT, this); 878} 879 880 881// Print a short set of xml attributes to identify this nmethod. The 882// output should be embedded in some other element. 883void nmethod::log_identity(xmlStream* log) const { 884 log->print(" compile_id='%d'", compile_id()); 885 const char* nm_kind = compile_kind(); 886 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind); 887 if (compiler() != NULL) { 888 log->print(" compiler='%s'", compiler()->name()); 889 } 890 if (TieredCompilation) { 891 log->print(" level='%d'", comp_level()); 892 } 893} 894 895 896#define LOG_OFFSET(log, name) \ 897 if ((intptr_t)name##_end() - (intptr_t)name##_begin()) \ 898 log->print(" " XSTR(name) "_offset='%d'" , \ 899 (intptr_t)name##_begin() - (intptr_t)this) 900 901 902void nmethod::log_new_nmethod() const { 903 if (LogCompilation && xtty != NULL) { 904 ttyLocker ttyl; 905 HandleMark hm; 906 xtty->begin_elem("nmethod"); 907 log_identity(xtty); 908 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", code_begin(), size()); 909 xtty->print(" address='" INTPTR_FORMAT "'", (intptr_t) this); 910 911 LOG_OFFSET(xtty, relocation); 912 LOG_OFFSET(xtty, consts); 913 LOG_OFFSET(xtty, insts); 914 LOG_OFFSET(xtty, stub); 915 LOG_OFFSET(xtty, scopes_data); 916 LOG_OFFSET(xtty, scopes_pcs); 917 LOG_OFFSET(xtty, dependencies); 918 LOG_OFFSET(xtty, handler_table); 919 LOG_OFFSET(xtty, nul_chk_table); 920 LOG_OFFSET(xtty, oops); 921 922 xtty->method(method()); 923 xtty->stamp(); 924 xtty->end_elem(); 925 } 926} 927 928#undef LOG_OFFSET 929 930 931void nmethod::print_compilation(outputStream *st, const char *method_name, const char *title, 932 methodOop method, bool is_blocking, int compile_id, int bci, int comp_level) { 933 bool is_synchronized = false, has_xhandler = false, is_native = false; 934 int code_size = -1; 935 if (method != NULL) { 936 is_synchronized = method->is_synchronized(); 937 has_xhandler = method->has_exception_handler(); 938 is_native = method->is_native(); 939 code_size = method->code_size(); 940 } 941 // print compilation number 942 st->print("%7d %3d", (int)tty->time_stamp().milliseconds(), compile_id); 943 944 // print method attributes 945 const bool is_osr = bci != InvocationEntryBci; 946 const char blocking_char = is_blocking ? 'b' : ' '; 947 const char compile_type = is_osr ? '%' : ' '; 948 const char sync_char = is_synchronized ? 's' : ' '; 949 const char exception_char = has_xhandler ? '!' : ' '; 950 const char native_char = is_native ? 'n' : ' '; 951 st->print("%c%c%c%c%c ", compile_type, sync_char, exception_char, blocking_char, native_char); 952 if (TieredCompilation) { 953 st->print("%d ", comp_level); 954 } 955 956 // print optional title 957 bool do_nl = false; 958 if (title != NULL) { 959 int tlen = (int) strlen(title); 960 bool do_nl = false; 961 if (tlen > 0 && title[tlen-1] == '\n') { tlen--; do_nl = true; } 962 st->print("%.*s", tlen, title); 963 } else { 964 do_nl = true; 965 } 966 967 // print method name string if given 968 if (method_name != NULL) { 969 st->print(method_name); 970 } else { 971 // otherwise as the method to print itself 972 if (method != NULL && !Universe::heap()->is_gc_active()) { 973 method->print_short_name(st); 974 } else { 975 st->print("(method)"); 976 } 977 } 978 979 if (method != NULL) { 980 // print osr_bci if any 981 if (is_osr) st->print(" @ %d", bci); 982 // print method size 983 st->print(" (%d bytes)", code_size); 984 } 985 if (do_nl) st->cr(); 986} 987 988// Print out more verbose output usually for a newly created nmethod. 989void nmethod::print_on(outputStream* st, const char* title) const { 990 if (st != NULL) { 991 ttyLocker ttyl; 992 print_compilation(st, /*method_name*/NULL, title, 993 method(), /*is_blocking*/false, 994 compile_id(), 995 is_osr_method() ? osr_entry_bci() : InvocationEntryBci, 996 comp_level()); 997 if (WizardMode) st->print(" (" INTPTR_FORMAT ")", this); 998 } 999} 1000 1001 1002void nmethod::print_nmethod(bool printmethod) { 1003 ttyLocker ttyl; // keep the following output all in one block 1004 if (xtty != NULL) { 1005 xtty->begin_head("print_nmethod"); 1006 xtty->stamp(); 1007 xtty->end_head(); 1008 } 1009 // print the header part first 1010 print(); 1011 // then print the requested information 1012 if (printmethod) { 1013 print_code(); 1014 print_pcs(); 1015 oop_maps()->print(); 1016 } 1017 if (PrintDebugInfo) { 1018 print_scopes(); 1019 } 1020 if (PrintRelocations) { 1021 print_relocations(); 1022 } 1023 if (PrintDependencies) { 1024 print_dependencies(); 1025 } 1026 if (PrintExceptionHandlers) { 1027 print_handler_table(); 1028 print_nul_chk_table(); 1029 } 1030 if (xtty != NULL) { 1031 xtty->tail("print_nmethod"); 1032 } 1033} 1034 1035 1036// Promote one word from an assembly-time handle to a live embedded oop. 1037inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) { 1038 if (handle == NULL || 1039 // As a special case, IC oops are initialized to 1 or -1. 1040 handle == (jobject) Universe::non_oop_word()) { 1041 (*dest) = (oop) handle; 1042 } else { 1043 (*dest) = JNIHandles::resolve_non_null(handle); 1044 } 1045} 1046 1047 1048void nmethod::copy_oops(GrowableArray<jobject>* array) { 1049 //assert(oops_size() == 0, "do this handshake just once, please"); 1050 int length = array->length(); 1051 assert((address)(oops_begin() + length) <= data_end(), "oops big enough"); 1052 oop* dest = oops_begin(); 1053 for (int index = 0 ; index < length; index++) { 1054 initialize_immediate_oop(&dest[index], array->at(index)); 1055 } 1056 1057 // Now we can fix up all the oops in the code. We need to do this 1058 // in the code because the assembler uses jobjects as placeholders. 1059 // The code and relocations have already been initialized by the 1060 // CodeBlob constructor, so it is valid even at this early point to 1061 // iterate over relocations and patch the code. 1062 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true); 1063} 1064 1065 1066bool nmethod::is_at_poll_return(address pc) { 1067 RelocIterator iter(this, pc, pc+1); 1068 while (iter.next()) { 1069 if (iter.type() == relocInfo::poll_return_type) 1070 return true; 1071 } 1072 return false; 1073} 1074 1075 1076bool nmethod::is_at_poll_or_poll_return(address pc) { 1077 RelocIterator iter(this, pc, pc+1); 1078 while (iter.next()) { 1079 relocInfo::relocType t = iter.type(); 1080 if (t == relocInfo::poll_return_type || t == relocInfo::poll_type) 1081 return true; 1082 } 1083 return false; 1084} 1085 1086 1087void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) { 1088 // re-patch all oop-bearing instructions, just in case some oops moved 1089 RelocIterator iter(this, begin, end); 1090 while (iter.next()) { 1091 if (iter.type() == relocInfo::oop_type) { 1092 oop_Relocation* reloc = iter.oop_reloc(); 1093 if (initialize_immediates && reloc->oop_is_immediate()) { 1094 oop* dest = reloc->oop_addr(); 1095 initialize_immediate_oop(dest, (jobject) *dest); 1096 } 1097 // Refresh the oop-related bits of this instruction. 1098 reloc->fix_oop_relocation(); 1099 } 1100 1101 // There must not be any interfering patches or breakpoints. 1102 assert(!(iter.type() == relocInfo::breakpoint_type 1103 && iter.breakpoint_reloc()->active()), 1104 "no active breakpoint"); 1105 } 1106} 1107 1108 1109ScopeDesc* nmethod::scope_desc_at(address pc) { 1110 PcDesc* pd = pc_desc_at(pc); 1111 guarantee(pd != NULL, "scope must be present"); 1112 return new ScopeDesc(this, pd->scope_decode_offset(), 1113 pd->obj_decode_offset(), pd->should_reexecute(), 1114 pd->return_oop()); 1115} 1116 1117 1118void nmethod::clear_inline_caches() { 1119 assert(SafepointSynchronize::is_at_safepoint(), "cleaning of IC's only allowed at safepoint"); 1120 if (is_zombie()) { 1121 return; 1122 } 1123 1124 RelocIterator iter(this); 1125 while (iter.next()) { 1126 iter.reloc()->clear_inline_cache(); 1127 } 1128} 1129 1130 1131void nmethod::cleanup_inline_caches() { 1132 1133 assert_locked_or_safepoint(CompiledIC_lock); 1134 1135 // If the method is not entrant or zombie then a JMP is plastered over the 1136 // first few bytes. If an oop in the old code was there, that oop 1137 // should not get GC'd. Skip the first few bytes of oops on 1138 // not-entrant methods. 1139 address low_boundary = verified_entry_point(); 1140 if (!is_in_use()) { 1141 low_boundary += NativeJump::instruction_size; 1142 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1143 // This means that the low_boundary is going to be a little too high. 1144 // This shouldn't matter, since oops of non-entrant methods are never used. 1145 // In fact, why are we bothering to look at oops in a non-entrant method?? 1146 } 1147 1148 // Find all calls in an nmethod, and clear the ones that points to zombie methods 1149 ResourceMark rm; 1150 RelocIterator iter(this, low_boundary); 1151 while(iter.next()) { 1152 switch(iter.type()) { 1153 case relocInfo::virtual_call_type: 1154 case relocInfo::opt_virtual_call_type: { 1155 CompiledIC *ic = CompiledIC_at(iter.reloc()); 1156 // Ok, to lookup references to zombies here 1157 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination()); 1158 if( cb != NULL && cb->is_nmethod() ) { 1159 nmethod* nm = (nmethod*)cb; 1160 // Clean inline caches pointing to both zombie and not_entrant methods 1161 if (!nm->is_in_use() || (nm->method()->code() != nm)) ic->set_to_clean(); 1162 } 1163 break; 1164 } 1165 case relocInfo::static_call_type: { 1166 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc()); 1167 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination()); 1168 if( cb != NULL && cb->is_nmethod() ) { 1169 nmethod* nm = (nmethod*)cb; 1170 // Clean inline caches pointing to both zombie and not_entrant methods 1171 if (!nm->is_in_use() || (nm->method()->code() != nm)) csc->set_to_clean(); 1172 } 1173 break; 1174 } 1175 } 1176 } 1177} 1178 1179// This is a private interface with the sweeper. 1180void nmethod::mark_as_seen_on_stack() { 1181 assert(is_not_entrant(), "must be a non-entrant method"); 1182 // Set the traversal mark to ensure that the sweeper does 2 1183 // cleaning passes before moving to zombie. 1184 set_stack_traversal_mark(NMethodSweeper::traversal_count()); 1185} 1186 1187// Tell if a non-entrant method can be converted to a zombie (i.e., there is no activations on the stack) 1188bool nmethod::can_not_entrant_be_converted() { 1189 assert(is_not_entrant(), "must be a non-entrant method"); 1190 1191 // Since the nmethod sweeper only does partial sweep the sweeper's traversal 1192 // count can be greater than the stack traversal count before it hits the 1193 // nmethod for the second time. 1194 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count(); 1195} 1196 1197void nmethod::inc_decompile_count() { 1198 if (!is_compiled_by_c2()) return; 1199 // Could be gated by ProfileTraps, but do not bother... 1200 methodOop m = method(); 1201 if (m == NULL) return; 1202 methodDataOop mdo = m->method_data(); 1203 if (mdo == NULL) return; 1204 // There is a benign race here. See comments in methodDataOop.hpp. 1205 mdo->inc_decompile_count(); 1206} 1207 1208void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) { 1209 1210 post_compiled_method_unload(); 1211 1212 // Since this nmethod is being unloaded, make sure that dependencies 1213 // recorded in instanceKlasses get flushed and pass non-NULL closure to 1214 // indicate that this work is being done during a GC. 1215 assert(Universe::heap()->is_gc_active(), "should only be called during gc"); 1216 assert(is_alive != NULL, "Should be non-NULL"); 1217 // A non-NULL is_alive closure indicates that this is being called during GC. 1218 flush_dependencies(is_alive); 1219 1220 // Break cycle between nmethod & method 1221 if (TraceClassUnloading && WizardMode) { 1222 tty->print_cr("[Class unloading: Making nmethod " INTPTR_FORMAT 1223 " unloadable], methodOop(" INTPTR_FORMAT 1224 "), cause(" INTPTR_FORMAT ")", 1225 this, (address)_method, (address)cause); 1226 if (!Universe::heap()->is_gc_active()) 1227 cause->klass()->print(); 1228 } 1229 // Unlink the osr method, so we do not look this up again 1230 if (is_osr_method()) { 1231 invalidate_osr_method(); 1232 } 1233 // If _method is already NULL the methodOop is about to be unloaded, 1234 // so we don't have to break the cycle. Note that it is possible to 1235 // have the methodOop live here, in case we unload the nmethod because 1236 // it is pointing to some oop (other than the methodOop) being unloaded. 1237 if (_method != NULL) { 1238 // OSR methods point to the methodOop, but the methodOop does not 1239 // point back! 1240 if (_method->code() == this) { 1241 _method->clear_code(); // Break a cycle 1242 } 1243 _method = NULL; // Clear the method of this dead nmethod 1244 } 1245 // Make the class unloaded - i.e., change state and notify sweeper 1246 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); 1247 if (is_in_use()) { 1248 // Transitioning directly from live to unloaded -- so 1249 // we need to force a cache clean-up; remember this 1250 // for later on. 1251 CodeCache::set_needs_cache_clean(true); 1252 } 1253 _state = unloaded; 1254 1255 // Log the unloading. 1256 log_state_change(); 1257 1258 // The methodOop is gone at this point 1259 assert(_method == NULL, "Tautology"); 1260 1261 set_osr_link(NULL); 1262 //set_scavenge_root_link(NULL); // done by prune_scavenge_root_nmethods 1263 NMethodSweeper::notify(this); 1264} 1265 1266void nmethod::invalidate_osr_method() { 1267 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); 1268 // Remove from list of active nmethods 1269 if (method() != NULL) 1270 instanceKlass::cast(method()->method_holder())->remove_osr_nmethod(this); 1271 // Set entry as invalid 1272 _entry_bci = InvalidOSREntryBci; 1273} 1274 1275void nmethod::log_state_change() const { 1276 if (LogCompilation) { 1277 if (xtty != NULL) { 1278 ttyLocker ttyl; // keep the following output all in one block 1279 if (_state == unloaded) { 1280 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'", 1281 os::current_thread_id()); 1282 } else { 1283 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s", 1284 os::current_thread_id(), 1285 (_state == zombie ? " zombie='1'" : "")); 1286 } 1287 log_identity(xtty); 1288 xtty->stamp(); 1289 xtty->end_elem(); 1290 } 1291 } 1292 if (PrintCompilation && _state != unloaded) { 1293 print_on(tty, _state == zombie ? "made zombie " : "made not entrant "); 1294 tty->cr(); 1295 } 1296} 1297 1298// Common functionality for both make_not_entrant and make_zombie 1299bool nmethod::make_not_entrant_or_zombie(unsigned int state) { 1300 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant"); 1301 1302 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below. 1303 nmethodLocker nml(this); 1304 methodHandle the_method(method()); 1305 No_Safepoint_Verifier nsv; 1306 1307 { 1308 // If the method is already zombie there is nothing to do 1309 if (is_zombie()) { 1310 return false; 1311 } 1312 1313 // invalidate osr nmethod before acquiring the patching lock since 1314 // they both acquire leaf locks and we don't want a deadlock. 1315 // This logic is equivalent to the logic below for patching the 1316 // verified entry point of regular methods. 1317 if (is_osr_method()) { 1318 // this effectively makes the osr nmethod not entrant 1319 invalidate_osr_method(); 1320 } 1321 1322 // Enter critical section. Does not block for safepoint. 1323 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 1324 1325 if (_state == state) { 1326 // another thread already performed this transition so nothing 1327 // to do, but return false to indicate this. 1328 return false; 1329 } 1330 1331 // The caller can be calling the method statically or through an inline 1332 // cache call. 1333 if (!is_osr_method() && !is_not_entrant()) { 1334 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(), 1335 SharedRuntime::get_handle_wrong_method_stub()); 1336 } 1337 1338 if (is_in_use()) { 1339 // It's a true state change, so mark the method as decompiled. 1340 // Do it only for transition from alive. 1341 inc_decompile_count(); 1342 } 1343 1344 // Change state 1345 _state = state; 1346 1347 // Log the transition once 1348 log_state_change(); 1349 1350 // Remove nmethod from method. 1351 // We need to check if both the _code and _from_compiled_code_entry_point 1352 // refer to this nmethod because there is a race in setting these two fields 1353 // in methodOop as seen in bugid 4947125. 1354 // If the vep() points to the zombie nmethod, the memory for the nmethod 1355 // could be flushed and the compiler and vtable stubs could still call 1356 // through it. 1357 if (method() != NULL && (method()->code() == this || 1358 method()->from_compiled_entry() == verified_entry_point())) { 1359 HandleMark hm; 1360 method()->clear_code(); 1361 } 1362 1363 if (state == not_entrant) { 1364 mark_as_seen_on_stack(); 1365 } 1366 1367 } // leave critical region under Patching_lock 1368 1369 // When the nmethod becomes zombie it is no longer alive so the 1370 // dependencies must be flushed. nmethods in the not_entrant 1371 // state will be flushed later when the transition to zombie 1372 // happens or they get unloaded. 1373 if (state == zombie) { 1374 { 1375 // Flushing dependecies must be done before any possible 1376 // safepoint can sneak in, otherwise the oops used by the 1377 // dependency logic could have become stale. 1378 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1379 flush_dependencies(NULL); 1380 } 1381 1382 { 1383 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload event 1384 // and it hasn't already been reported for this nmethod then report it now. 1385 // (the event may have been reported earilier if the GC marked it for unloading). 1386 Pause_No_Safepoint_Verifier pnsv(&nsv); 1387 post_compiled_method_unload(); 1388 } 1389 1390#ifdef ASSERT 1391 // It's no longer safe to access the oops section since zombie 1392 // nmethods aren't scanned for GC. 1393 _oops_are_stale = true; 1394#endif 1395 } else { 1396 assert(state == not_entrant, "other cases may need to be handled differently"); 1397 } 1398 1399 if (TraceCreateZombies) { 1400 tty->print_cr("nmethod <" INTPTR_FORMAT "> code made %s", this, (state == not_entrant) ? "not entrant" : "zombie"); 1401 } 1402 1403 // Make sweeper aware that there is a zombie method that needs to be removed 1404 NMethodSweeper::notify(this); 1405 1406 return true; 1407} 1408 1409void nmethod::flush() { 1410 // Note that there are no valid oops in the nmethod anymore. 1411 assert(is_zombie() || (is_osr_method() && is_unloaded()), "must be a zombie method"); 1412 assert(is_marked_for_reclamation() || (is_osr_method() && is_unloaded()), "must be marked for reclamation"); 1413 1414 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed"); 1415 assert_locked_or_safepoint(CodeCache_lock); 1416 1417 // completely deallocate this method 1418 EventMark m("flushing nmethod " INTPTR_FORMAT " %s", this, ""); 1419 if (PrintMethodFlushing) { 1420 tty->print_cr("*flushing nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT "/Free CodeCache:" SIZE_FORMAT "Kb", 1421 _compile_id, this, CodeCache::nof_blobs(), CodeCache::unallocated_capacity()/1024); 1422 } 1423 1424 // We need to deallocate any ExceptionCache data. 1425 // Note that we do not need to grab the nmethod lock for this, it 1426 // better be thread safe if we're disposing of it! 1427 ExceptionCache* ec = exception_cache(); 1428 set_exception_cache(NULL); 1429 while(ec != NULL) { 1430 ExceptionCache* next = ec->next(); 1431 delete ec; 1432 ec = next; 1433 } 1434 1435 if (on_scavenge_root_list()) { 1436 CodeCache::drop_scavenge_root_nmethod(this); 1437 } 1438 1439 if (is_speculatively_disconnected()) { 1440 CodeCache::remove_saved_code(this); 1441 } 1442 1443#ifdef SHARK 1444 ((SharkCompiler *) compiler())->free_compiled_method(insts_begin()); 1445#endif // SHARK 1446 1447 ((CodeBlob*)(this))->flush(); 1448 1449 CodeCache::free(this); 1450} 1451 1452 1453// 1454// Notify all classes this nmethod is dependent on that it is no 1455// longer dependent. This should only be called in two situations. 1456// First, when a nmethod transitions to a zombie all dependents need 1457// to be clear. Since zombification happens at a safepoint there's no 1458// synchronization issues. The second place is a little more tricky. 1459// During phase 1 of mark sweep class unloading may happen and as a 1460// result some nmethods may get unloaded. In this case the flushing 1461// of dependencies must happen during phase 1 since after GC any 1462// dependencies in the unloaded nmethod won't be updated, so 1463// traversing the dependency information in unsafe. In that case this 1464// function is called with a non-NULL argument and this function only 1465// notifies instanceKlasses that are reachable 1466 1467void nmethod::flush_dependencies(BoolObjectClosure* is_alive) { 1468 assert_locked_or_safepoint(CodeCache_lock); 1469 assert(Universe::heap()->is_gc_active() == (is_alive != NULL), 1470 "is_alive is non-NULL if and only if we are called during GC"); 1471 if (!has_flushed_dependencies()) { 1472 set_has_flushed_dependencies(); 1473 for (Dependencies::DepStream deps(this); deps.next(); ) { 1474 klassOop klass = deps.context_type(); 1475 if (klass == NULL) continue; // ignore things like evol_method 1476 1477 // During GC the is_alive closure is non-NULL, and is used to 1478 // determine liveness of dependees that need to be updated. 1479 if (is_alive == NULL || is_alive->do_object_b(klass)) { 1480 instanceKlass::cast(klass)->remove_dependent_nmethod(this); 1481 } 1482 } 1483 } 1484} 1485 1486 1487// If this oop is not live, the nmethod can be unloaded. 1488bool nmethod::can_unload(BoolObjectClosure* is_alive, 1489 OopClosure* keep_alive, 1490 oop* root, bool unloading_occurred) { 1491 assert(root != NULL, "just checking"); 1492 oop obj = *root; 1493 if (obj == NULL || is_alive->do_object_b(obj)) { 1494 return false; 1495 } 1496 if (obj->is_compiledICHolder()) { 1497 compiledICHolderOop cichk_oop = compiledICHolderOop(obj); 1498 if (is_alive->do_object_b( 1499 cichk_oop->holder_method()->method_holder()) && 1500 is_alive->do_object_b(cichk_oop->holder_klass())) { 1501 // The oop should be kept alive 1502 keep_alive->do_oop(root); 1503 return false; 1504 } 1505 } 1506 // If ScavengeRootsInCode is true, an nmethod might be unloaded 1507 // simply because one of its constant oops has gone dead. 1508 // No actual classes need to be unloaded in order for this to occur. 1509 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading"); 1510 make_unloaded(is_alive, obj); 1511 return true; 1512} 1513 1514// ------------------------------------------------------------------ 1515// post_compiled_method_load_event 1516// new method for install_code() path 1517// Transfer information from compilation to jvmti 1518void nmethod::post_compiled_method_load_event() { 1519 1520 methodOop moop = method(); 1521 HS_DTRACE_PROBE8(hotspot, compiled__method__load, 1522 moop->klass_name()->bytes(), 1523 moop->klass_name()->utf8_length(), 1524 moop->name()->bytes(), 1525 moop->name()->utf8_length(), 1526 moop->signature()->bytes(), 1527 moop->signature()->utf8_length(), 1528 insts_begin(), insts_size()); 1529 1530 if (JvmtiExport::should_post_compiled_method_load() || 1531 JvmtiExport::should_post_compiled_method_unload()) { 1532 get_and_cache_jmethod_id(); 1533 } 1534 1535 if (JvmtiExport::should_post_compiled_method_load()) { 1536 JvmtiExport::post_compiled_method_load(this); 1537 } 1538} 1539 1540jmethodID nmethod::get_and_cache_jmethod_id() { 1541 if (_jmethod_id == NULL) { 1542 // Cache the jmethod_id since it can no longer be looked up once the 1543 // method itself has been marked for unloading. 1544 _jmethod_id = method()->jmethod_id(); 1545 } 1546 return _jmethod_id; 1547} 1548 1549void nmethod::post_compiled_method_unload() { 1550 if (unload_reported()) { 1551 // During unloading we transition to unloaded and then to zombie 1552 // and the unloading is reported during the first transition. 1553 return; 1554 } 1555 1556 assert(_method != NULL && !is_unloaded(), "just checking"); 1557 DTRACE_METHOD_UNLOAD_PROBE(method()); 1558 1559 // If a JVMTI agent has enabled the CompiledMethodUnload event then 1560 // post the event. Sometime later this nmethod will be made a zombie 1561 // by the sweeper but the methodOop will not be valid at that point. 1562 // If the _jmethod_id is null then no load event was ever requested 1563 // so don't bother posting the unload. The main reason for this is 1564 // that the jmethodID is a weak reference to the methodOop so if 1565 // it's being unloaded there's no way to look it up since the weak 1566 // ref will have been cleared. 1567 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) { 1568 assert(!unload_reported(), "already unloaded"); 1569 HandleMark hm; 1570 JvmtiExport::post_compiled_method_unload(_jmethod_id, insts_begin()); 1571 } 1572 1573 // The JVMTI CompiledMethodUnload event can be enabled or disabled at 1574 // any time. As the nmethod is being unloaded now we mark it has 1575 // having the unload event reported - this will ensure that we don't 1576 // attempt to report the event in the unlikely scenario where the 1577 // event is enabled at the time the nmethod is made a zombie. 1578 set_unload_reported(); 1579} 1580 1581// This is called at the end of the strong tracing/marking phase of a 1582// GC to unload an nmethod if it contains otherwise unreachable 1583// oops. 1584 1585void nmethod::do_unloading(BoolObjectClosure* is_alive, 1586 OopClosure* keep_alive, bool unloading_occurred) { 1587 // Make sure the oop's ready to receive visitors 1588 assert(!is_zombie() && !is_unloaded(), 1589 "should not call follow on zombie or unloaded nmethod"); 1590 1591 // If the method is not entrant then a JMP is plastered over the 1592 // first few bytes. If an oop in the old code was there, that oop 1593 // should not get GC'd. Skip the first few bytes of oops on 1594 // not-entrant methods. 1595 address low_boundary = verified_entry_point(); 1596 if (is_not_entrant()) { 1597 low_boundary += NativeJump::instruction_size; 1598 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1599 // (See comment above.) 1600 } 1601 1602 // The RedefineClasses() API can cause the class unloading invariant 1603 // to no longer be true. See jvmtiExport.hpp for details. 1604 // Also, leave a debugging breadcrumb in local flag. 1605 bool a_class_was_redefined = JvmtiExport::has_redefined_a_class(); 1606 if (a_class_was_redefined) { 1607 // This set of the unloading_occurred flag is done before the 1608 // call to post_compiled_method_unload() so that the unloading 1609 // of this nmethod is reported. 1610 unloading_occurred = true; 1611 } 1612 1613 // Follow methodOop 1614 if (can_unload(is_alive, keep_alive, (oop*)&_method, unloading_occurred)) { 1615 return; 1616 } 1617 1618 // Exception cache 1619 ExceptionCache* ec = exception_cache(); 1620 while (ec != NULL) { 1621 oop* ex_addr = (oop*)ec->exception_type_addr(); 1622 oop ex = *ex_addr; 1623 ExceptionCache* next_ec = ec->next(); 1624 if (ex != NULL && !is_alive->do_object_b(ex)) { 1625 assert(!ex->is_compiledICHolder(), "Possible error here"); 1626 remove_from_exception_cache(ec); 1627 } 1628 ec = next_ec; 1629 } 1630 1631 // If class unloading occurred we first iterate over all inline caches and 1632 // clear ICs where the cached oop is referring to an unloaded klass or method. 1633 // The remaining live cached oops will be traversed in the relocInfo::oop_type 1634 // iteration below. 1635 if (unloading_occurred) { 1636 RelocIterator iter(this, low_boundary); 1637 while(iter.next()) { 1638 if (iter.type() == relocInfo::virtual_call_type) { 1639 CompiledIC *ic = CompiledIC_at(iter.reloc()); 1640 oop ic_oop = ic->cached_oop(); 1641 if (ic_oop != NULL && !is_alive->do_object_b(ic_oop)) { 1642 // The only exception is compiledICHolder oops which may 1643 // yet be marked below. (We check this further below). 1644 if (ic_oop->is_compiledICHolder()) { 1645 compiledICHolderOop cichk_oop = compiledICHolderOop(ic_oop); 1646 if (is_alive->do_object_b( 1647 cichk_oop->holder_method()->method_holder()) && 1648 is_alive->do_object_b(cichk_oop->holder_klass())) { 1649 continue; 1650 } 1651 } 1652 ic->set_to_clean(); 1653 assert(ic->cached_oop() == NULL, 1654 "cached oop in IC should be cleared"); 1655 } 1656 } 1657 } 1658 } 1659 1660 // Compiled code 1661 RelocIterator iter(this, low_boundary); 1662 while (iter.next()) { 1663 if (iter.type() == relocInfo::oop_type) { 1664 oop_Relocation* r = iter.oop_reloc(); 1665 // In this loop, we must only traverse those oops directly embedded in 1666 // the code. Other oops (oop_index>0) are seen as part of scopes_oops. 1667 assert(1 == (r->oop_is_immediate()) + 1668 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 1669 "oop must be found in exactly one place"); 1670 if (r->oop_is_immediate() && r->oop_value() != NULL) { 1671 if (can_unload(is_alive, keep_alive, r->oop_addr(), unloading_occurred)) { 1672 return; 1673 } 1674 } 1675 } 1676 } 1677 1678 1679 // Scopes 1680 for (oop* p = oops_begin(); p < oops_end(); p++) { 1681 if (*p == Universe::non_oop_word()) continue; // skip non-oops 1682 if (can_unload(is_alive, keep_alive, p, unloading_occurred)) { 1683 return; 1684 } 1685 } 1686 1687#ifndef PRODUCT 1688 // This nmethod was not unloaded; check below that all CompiledICs 1689 // refer to marked oops. 1690 { 1691 RelocIterator iter(this, low_boundary); 1692 while (iter.next()) { 1693 if (iter.type() == relocInfo::virtual_call_type) { 1694 CompiledIC *ic = CompiledIC_at(iter.reloc()); 1695 oop ic_oop = ic->cached_oop(); 1696 assert(ic_oop == NULL || is_alive->do_object_b(ic_oop), 1697 "Found unmarked ic_oop in reachable nmethod"); 1698 } 1699 } 1700 } 1701#endif // !PRODUCT 1702} 1703 1704// This method is called twice during GC -- once while 1705// tracing the "active" nmethods on thread stacks during 1706// the (strong) marking phase, and then again when walking 1707// the code cache contents during the weak roots processing 1708// phase. The two uses are distinguished by means of the 1709// 'do_strong_roots_only' flag, which is true in the first 1710// case. We want to walk the weak roots in the nmethod 1711// only in the second case. The weak roots in the nmethod 1712// are the oops in the ExceptionCache and the InlineCache 1713// oops. 1714void nmethod::oops_do(OopClosure* f, bool do_strong_roots_only) { 1715 // make sure the oops ready to receive visitors 1716 assert(!is_zombie() && !is_unloaded(), 1717 "should not call follow on zombie or unloaded nmethod"); 1718 1719 // If the method is not entrant or zombie then a JMP is plastered over the 1720 // first few bytes. If an oop in the old code was there, that oop 1721 // should not get GC'd. Skip the first few bytes of oops on 1722 // not-entrant methods. 1723 address low_boundary = verified_entry_point(); 1724 if (is_not_entrant()) { 1725 low_boundary += NativeJump::instruction_size; 1726 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1727 // (See comment above.) 1728 } 1729 1730 // Compiled code 1731 f->do_oop((oop*) &_method); 1732 if (!do_strong_roots_only) { 1733 // weak roots processing phase -- update ExceptionCache oops 1734 ExceptionCache* ec = exception_cache(); 1735 while(ec != NULL) { 1736 f->do_oop((oop*)ec->exception_type_addr()); 1737 ec = ec->next(); 1738 } 1739 } // Else strong roots phase -- skip oops in ExceptionCache 1740 1741 RelocIterator iter(this, low_boundary); 1742 1743 while (iter.next()) { 1744 if (iter.type() == relocInfo::oop_type ) { 1745 oop_Relocation* r = iter.oop_reloc(); 1746 // In this loop, we must only follow those oops directly embedded in 1747 // the code. Other oops (oop_index>0) are seen as part of scopes_oops. 1748 assert(1 == (r->oop_is_immediate()) + 1749 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 1750 "oop must be found in exactly one place"); 1751 if (r->oop_is_immediate() && r->oop_value() != NULL) { 1752 f->do_oop(r->oop_addr()); 1753 } 1754 } 1755 } 1756 1757 // Scopes 1758 // This includes oop constants not inlined in the code stream. 1759 for (oop* p = oops_begin(); p < oops_end(); p++) { 1760 if (*p == Universe::non_oop_word()) continue; // skip non-oops 1761 f->do_oop(p); 1762 } 1763} 1764 1765#define NMETHOD_SENTINEL ((nmethod*)badAddress) 1766 1767nmethod* volatile nmethod::_oops_do_mark_nmethods; 1768 1769// An nmethod is "marked" if its _mark_link is set non-null. 1770// Even if it is the end of the linked list, it will have a non-null link value, 1771// as long as it is on the list. 1772// This code must be MP safe, because it is used from parallel GC passes. 1773bool nmethod::test_set_oops_do_mark() { 1774 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called"); 1775 nmethod* observed_mark_link = _oops_do_mark_link; 1776 if (observed_mark_link == NULL) { 1777 // Claim this nmethod for this thread to mark. 1778 observed_mark_link = (nmethod*) 1779 Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_link, NULL); 1780 if (observed_mark_link == NULL) { 1781 1782 // Atomically append this nmethod (now claimed) to the head of the list: 1783 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods; 1784 for (;;) { 1785 nmethod* required_mark_nmethods = observed_mark_nmethods; 1786 _oops_do_mark_link = required_mark_nmethods; 1787 observed_mark_nmethods = (nmethod*) 1788 Atomic::cmpxchg_ptr(this, &_oops_do_mark_nmethods, required_mark_nmethods); 1789 if (observed_mark_nmethods == required_mark_nmethods) 1790 break; 1791 } 1792 // Mark was clear when we first saw this guy. 1793 NOT_PRODUCT(if (TraceScavenge) print_on(tty, "oops_do, mark\n")); 1794 return false; 1795 } 1796 } 1797 // On fall through, another racing thread marked this nmethod before we did. 1798 return true; 1799} 1800 1801void nmethod::oops_do_marking_prologue() { 1802 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("[oops_do_marking_prologue")); 1803 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row"); 1804 // We use cmpxchg_ptr instead of regular assignment here because the user 1805 // may fork a bunch of threads, and we need them all to see the same state. 1806 void* observed = Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, NULL); 1807 guarantee(observed == NULL, "no races in this sequential code"); 1808} 1809 1810void nmethod::oops_do_marking_epilogue() { 1811 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row"); 1812 nmethod* cur = _oops_do_mark_nmethods; 1813 while (cur != NMETHOD_SENTINEL) { 1814 assert(cur != NULL, "not NULL-terminated"); 1815 nmethod* next = cur->_oops_do_mark_link; 1816 cur->_oops_do_mark_link = NULL; 1817 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark\n")); 1818 cur = next; 1819 } 1820 void* required = _oops_do_mark_nmethods; 1821 void* observed = Atomic::cmpxchg_ptr(NULL, &_oops_do_mark_nmethods, required); 1822 guarantee(observed == required, "no races in this sequential code"); 1823 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("oops_do_marking_epilogue]")); 1824} 1825 1826class DetectScavengeRoot: public OopClosure { 1827 bool _detected_scavenge_root; 1828public: 1829 DetectScavengeRoot() : _detected_scavenge_root(false) 1830 { NOT_PRODUCT(_print_nm = NULL); } 1831 bool detected_scavenge_root() { return _detected_scavenge_root; } 1832 virtual void do_oop(oop* p) { 1833 if ((*p) != NULL && (*p)->is_scavengable()) { 1834 NOT_PRODUCT(maybe_print(p)); 1835 _detected_scavenge_root = true; 1836 } 1837 } 1838 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 1839 1840#ifndef PRODUCT 1841 nmethod* _print_nm; 1842 void maybe_print(oop* p) { 1843 if (_print_nm == NULL) return; 1844 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root"); 1845 tty->print_cr(""PTR_FORMAT"[offset=%d] detected non-perm oop "PTR_FORMAT" (found at "PTR_FORMAT")", 1846 _print_nm, (int)((intptr_t)p - (intptr_t)_print_nm), 1847 (intptr_t)(*p), (intptr_t)p); 1848 (*p)->print(); 1849 } 1850#endif //PRODUCT 1851}; 1852 1853bool nmethod::detect_scavenge_root_oops() { 1854 DetectScavengeRoot detect_scavenge_root; 1855 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this); 1856 oops_do(&detect_scavenge_root); 1857 return detect_scavenge_root.detected_scavenge_root(); 1858} 1859 1860// Method that knows how to preserve outgoing arguments at call. This method must be 1861// called with a frame corresponding to a Java invoke 1862void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { 1863#ifndef SHARK 1864 if (!method()->is_native()) { 1865 SimpleScopeDesc ssd(this, fr.pc()); 1866 Bytecode_invoke call(ssd.method(), ssd.bci()); 1867 bool has_receiver = call.has_receiver(); 1868 Symbol* signature = call.signature(); 1869 fr.oops_compiled_arguments_do(signature, has_receiver, reg_map, f); 1870 } 1871#endif // !SHARK 1872} 1873 1874 1875oop nmethod::embeddedOop_at(u_char* p) { 1876 RelocIterator iter(this, p, p + oopSize); 1877 while (iter.next()) 1878 if (iter.type() == relocInfo::oop_type) { 1879 return iter.oop_reloc()->oop_value(); 1880 } 1881 return NULL; 1882} 1883 1884 1885inline bool includes(void* p, void* from, void* to) { 1886 return from <= p && p < to; 1887} 1888 1889 1890void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) { 1891 assert(count >= 2, "must be sentinel values, at least"); 1892 1893#ifdef ASSERT 1894 // must be sorted and unique; we do a binary search in find_pc_desc() 1895 int prev_offset = pcs[0].pc_offset(); 1896 assert(prev_offset == PcDesc::lower_offset_limit, 1897 "must start with a sentinel"); 1898 for (int i = 1; i < count; i++) { 1899 int this_offset = pcs[i].pc_offset(); 1900 assert(this_offset > prev_offset, "offsets must be sorted"); 1901 prev_offset = this_offset; 1902 } 1903 assert(prev_offset == PcDesc::upper_offset_limit, 1904 "must end with a sentinel"); 1905#endif //ASSERT 1906 1907 // Search for MethodHandle invokes and tag the nmethod. 1908 for (int i = 0; i < count; i++) { 1909 if (pcs[i].is_method_handle_invoke()) { 1910 set_has_method_handle_invokes(true); 1911 break; 1912 } 1913 } 1914 assert(has_method_handle_invokes() == (_deoptimize_mh_offset != -1), "must have deopt mh handler"); 1915 1916 int size = count * sizeof(PcDesc); 1917 assert(scopes_pcs_size() >= size, "oob"); 1918 memcpy(scopes_pcs_begin(), pcs, size); 1919 1920 // Adjust the final sentinel downward. 1921 PcDesc* last_pc = &scopes_pcs_begin()[count-1]; 1922 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity"); 1923 last_pc->set_pc_offset(content_size() + 1); 1924 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) { 1925 // Fill any rounding gaps with copies of the last record. 1926 last_pc[1] = last_pc[0]; 1927 } 1928 // The following assert could fail if sizeof(PcDesc) is not 1929 // an integral multiple of oopSize (the rounding term). 1930 // If it fails, change the logic to always allocate a multiple 1931 // of sizeof(PcDesc), and fill unused words with copies of *last_pc. 1932 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly"); 1933} 1934 1935void nmethod::copy_scopes_data(u_char* buffer, int size) { 1936 assert(scopes_data_size() >= size, "oob"); 1937 memcpy(scopes_data_begin(), buffer, size); 1938} 1939 1940 1941#ifdef ASSERT 1942static PcDesc* linear_search(nmethod* nm, int pc_offset, bool approximate) { 1943 PcDesc* lower = nm->scopes_pcs_begin(); 1944 PcDesc* upper = nm->scopes_pcs_end(); 1945 lower += 1; // exclude initial sentinel 1946 PcDesc* res = NULL; 1947 for (PcDesc* p = lower; p < upper; p++) { 1948 NOT_PRODUCT(--nmethod_stats.pc_desc_tests); // don't count this call to match_desc 1949 if (match_desc(p, pc_offset, approximate)) { 1950 if (res == NULL) 1951 res = p; 1952 else 1953 res = (PcDesc*) badAddress; 1954 } 1955 } 1956 return res; 1957} 1958#endif 1959 1960 1961// Finds a PcDesc with real-pc equal to "pc" 1962PcDesc* nmethod::find_pc_desc_internal(address pc, bool approximate) { 1963 address base_address = code_begin(); 1964 if ((pc < base_address) || 1965 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) { 1966 return NULL; // PC is wildly out of range 1967 } 1968 int pc_offset = (int) (pc - base_address); 1969 1970 // Check the PcDesc cache if it contains the desired PcDesc 1971 // (This as an almost 100% hit rate.) 1972 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate); 1973 if (res != NULL) { 1974 assert(res == linear_search(this, pc_offset, approximate), "cache ok"); 1975 return res; 1976 } 1977 1978 // Fallback algorithm: quasi-linear search for the PcDesc 1979 // Find the last pc_offset less than the given offset. 1980 // The successor must be the required match, if there is a match at all. 1981 // (Use a fixed radix to avoid expensive affine pointer arithmetic.) 1982 PcDesc* lower = scopes_pcs_begin(); 1983 PcDesc* upper = scopes_pcs_end(); 1984 upper -= 1; // exclude final sentinel 1985 if (lower >= upper) return NULL; // native method; no PcDescs at all 1986 1987#define assert_LU_OK \ 1988 /* invariant on lower..upper during the following search: */ \ 1989 assert(lower->pc_offset() < pc_offset, "sanity"); \ 1990 assert(upper->pc_offset() >= pc_offset, "sanity") 1991 assert_LU_OK; 1992 1993 // Use the last successful return as a split point. 1994 PcDesc* mid = _pc_desc_cache.last_pc_desc(); 1995 NOT_PRODUCT(++nmethod_stats.pc_desc_searches); 1996 if (mid->pc_offset() < pc_offset) { 1997 lower = mid; 1998 } else { 1999 upper = mid; 2000 } 2001 2002 // Take giant steps at first (4096, then 256, then 16, then 1) 2003 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1); 2004 const int RADIX = (1 << LOG2_RADIX); 2005 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) { 2006 while ((mid = lower + step) < upper) { 2007 assert_LU_OK; 2008 NOT_PRODUCT(++nmethod_stats.pc_desc_searches); 2009 if (mid->pc_offset() < pc_offset) { 2010 lower = mid; 2011 } else { 2012 upper = mid; 2013 break; 2014 } 2015 } 2016 assert_LU_OK; 2017 } 2018 2019 // Sneak up on the value with a linear search of length ~16. 2020 while (true) { 2021 assert_LU_OK; 2022 mid = lower + 1; 2023 NOT_PRODUCT(++nmethod_stats.pc_desc_searches); 2024 if (mid->pc_offset() < pc_offset) { 2025 lower = mid; 2026 } else { 2027 upper = mid; 2028 break; 2029 } 2030 } 2031#undef assert_LU_OK 2032 2033 if (match_desc(upper, pc_offset, approximate)) { 2034 assert(upper == linear_search(this, pc_offset, approximate), "search ok"); 2035 _pc_desc_cache.add_pc_desc(upper); 2036 return upper; 2037 } else { 2038 assert(NULL == linear_search(this, pc_offset, approximate), "search ok"); 2039 return NULL; 2040 } 2041} 2042 2043 2044bool nmethod::check_all_dependencies() { 2045 bool found_check = false; 2046 // wholesale check of all dependencies 2047 for (Dependencies::DepStream deps(this); deps.next(); ) { 2048 if (deps.check_dependency() != NULL) { 2049 found_check = true; 2050 NOT_DEBUG(break); 2051 } 2052 } 2053 return found_check; // tell caller if we found anything 2054} 2055 2056bool nmethod::check_dependency_on(DepChange& changes) { 2057 // What has happened: 2058 // 1) a new class dependee has been added 2059 // 2) dependee and all its super classes have been marked 2060 bool found_check = false; // set true if we are upset 2061 for (Dependencies::DepStream deps(this); deps.next(); ) { 2062 // Evaluate only relevant dependencies. 2063 if (deps.spot_check_dependency_at(changes) != NULL) { 2064 found_check = true; 2065 NOT_DEBUG(break); 2066 } 2067 } 2068 return found_check; 2069} 2070 2071bool nmethod::is_evol_dependent_on(klassOop dependee) { 2072 instanceKlass *dependee_ik = instanceKlass::cast(dependee); 2073 objArrayOop dependee_methods = dependee_ik->methods(); 2074 for (Dependencies::DepStream deps(this); deps.next(); ) { 2075 if (deps.type() == Dependencies::evol_method) { 2076 methodOop method = deps.method_argument(0); 2077 for (int j = 0; j < dependee_methods->length(); j++) { 2078 if ((methodOop) dependee_methods->obj_at(j) == method) { 2079 // RC_TRACE macro has an embedded ResourceMark 2080 RC_TRACE(0x01000000, 2081 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)", 2082 _method->method_holder()->klass_part()->external_name(), 2083 _method->name()->as_C_string(), 2084 _method->signature()->as_C_string(), compile_id(), 2085 method->method_holder()->klass_part()->external_name(), 2086 method->name()->as_C_string(), 2087 method->signature()->as_C_string())); 2088 if (TraceDependencies || LogCompilation) 2089 deps.log_dependency(dependee); 2090 return true; 2091 } 2092 } 2093 } 2094 } 2095 return false; 2096} 2097 2098// Called from mark_for_deoptimization, when dependee is invalidated. 2099bool nmethod::is_dependent_on_method(methodOop dependee) { 2100 for (Dependencies::DepStream deps(this); deps.next(); ) { 2101 if (deps.type() != Dependencies::evol_method) 2102 continue; 2103 methodOop method = deps.method_argument(0); 2104 if (method == dependee) return true; 2105 } 2106 return false; 2107} 2108 2109 2110bool nmethod::is_patchable_at(address instr_addr) { 2111 assert(insts_contains(instr_addr), "wrong nmethod used"); 2112 if (is_zombie()) { 2113 // a zombie may never be patched 2114 return false; 2115 } 2116 return true; 2117} 2118 2119 2120address nmethod::continuation_for_implicit_exception(address pc) { 2121 // Exception happened outside inline-cache check code => we are inside 2122 // an active nmethod => use cpc to determine a return address 2123 int exception_offset = pc - code_begin(); 2124 int cont_offset = ImplicitExceptionTable(this).at( exception_offset ); 2125#ifdef ASSERT 2126 if (cont_offset == 0) { 2127 Thread* thread = ThreadLocalStorage::get_thread_slow(); 2128 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY 2129 HandleMark hm(thread); 2130 ResourceMark rm(thread); 2131 CodeBlob* cb = CodeCache::find_blob(pc); 2132 assert(cb != NULL && cb == this, ""); 2133 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, pc); 2134 print(); 2135 method()->print_codes(); 2136 print_code(); 2137 print_pcs(); 2138 } 2139#endif 2140 if (cont_offset == 0) { 2141 // Let the normal error handling report the exception 2142 return NULL; 2143 } 2144 return code_begin() + cont_offset; 2145} 2146 2147 2148 2149void nmethod_init() { 2150 // make sure you didn't forget to adjust the filler fields 2151 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word"); 2152} 2153 2154 2155//------------------------------------------------------------------------------------------- 2156 2157 2158// QQQ might we make this work from a frame?? 2159nmethodLocker::nmethodLocker(address pc) { 2160 CodeBlob* cb = CodeCache::find_blob(pc); 2161 guarantee(cb != NULL && cb->is_nmethod(), "bad pc for a nmethod found"); 2162 _nm = (nmethod*)cb; 2163 lock_nmethod(_nm); 2164} 2165 2166void nmethodLocker::lock_nmethod(nmethod* nm) { 2167 if (nm == NULL) return; 2168 Atomic::inc(&nm->_lock_count); 2169 guarantee(!nm->is_zombie(), "cannot lock a zombie method"); 2170} 2171 2172void nmethodLocker::unlock_nmethod(nmethod* nm) { 2173 if (nm == NULL) return; 2174 Atomic::dec(&nm->_lock_count); 2175 guarantee(nm->_lock_count >= 0, "unmatched nmethod lock/unlock"); 2176} 2177 2178 2179// ----------------------------------------------------------------------------- 2180// nmethod::get_deopt_original_pc 2181// 2182// Return the original PC for the given PC if: 2183// (a) the given PC belongs to a nmethod and 2184// (b) it is a deopt PC 2185address nmethod::get_deopt_original_pc(const frame* fr) { 2186 if (fr->cb() == NULL) return NULL; 2187 2188 nmethod* nm = fr->cb()->as_nmethod_or_null(); 2189 if (nm != NULL && nm->is_deopt_pc(fr->pc())) 2190 return nm->get_original_pc(fr); 2191 2192 return NULL; 2193} 2194 2195 2196// ----------------------------------------------------------------------------- 2197// MethodHandle 2198 2199bool nmethod::is_method_handle_return(address return_pc) { 2200 if (!has_method_handle_invokes()) return false; 2201 PcDesc* pd = pc_desc_at(return_pc); 2202 if (pd == NULL) 2203 return false; 2204 return pd->is_method_handle_invoke(); 2205} 2206 2207 2208// ----------------------------------------------------------------------------- 2209// Verification 2210 2211class VerifyOopsClosure: public OopClosure { 2212 nmethod* _nm; 2213 bool _ok; 2214public: 2215 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { } 2216 bool ok() { return _ok; } 2217 virtual void do_oop(oop* p) { 2218 if ((*p) == NULL || (*p)->is_oop()) return; 2219 if (_ok) { 2220 _nm->print_nmethod(true); 2221 _ok = false; 2222 } 2223 tty->print_cr("*** non-oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)", 2224 (intptr_t)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm)); 2225 } 2226 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2227}; 2228 2229void nmethod::verify() { 2230 2231 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant 2232 // seems odd. 2233 2234 if( is_zombie() || is_not_entrant() ) 2235 return; 2236 2237 // Make sure all the entry points are correctly aligned for patching. 2238 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point()); 2239 2240 assert(method()->is_oop(), "must be valid"); 2241 2242 ResourceMark rm; 2243 2244 if (!CodeCache::contains(this)) { 2245 fatal(err_msg("nmethod at " INTPTR_FORMAT " not in zone", this)); 2246 } 2247 2248 if(is_native_method() ) 2249 return; 2250 2251 nmethod* nm = CodeCache::find_nmethod(verified_entry_point()); 2252 if (nm != this) { 2253 fatal(err_msg("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", 2254 this)); 2255 } 2256 2257 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2258 if (! p->verify(this)) { 2259 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", this); 2260 } 2261 } 2262 2263 VerifyOopsClosure voc(this); 2264 oops_do(&voc); 2265 assert(voc.ok(), "embedded oops must be OK"); 2266 verify_scavenge_root_oops(); 2267 2268 verify_scopes(); 2269} 2270 2271 2272void nmethod::verify_interrupt_point(address call_site) { 2273 // This code does not work in release mode since 2274 // owns_lock only is available in debug mode. 2275 CompiledIC* ic = NULL; 2276 Thread *cur = Thread::current(); 2277 if (CompiledIC_lock->owner() == cur || 2278 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) && 2279 SafepointSynchronize::is_at_safepoint())) { 2280 ic = CompiledIC_at(call_site); 2281 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); 2282 } else { 2283 MutexLocker ml_verify (CompiledIC_lock); 2284 ic = CompiledIC_at(call_site); 2285 } 2286 PcDesc* pd = pc_desc_at(ic->end_of_call()); 2287 assert(pd != NULL, "PcDesc must exist"); 2288 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(), 2289 pd->obj_decode_offset(), pd->should_reexecute(), 2290 pd->return_oop()); 2291 !sd->is_top(); sd = sd->sender()) { 2292 sd->verify(); 2293 } 2294} 2295 2296void nmethod::verify_scopes() { 2297 if( !method() ) return; // Runtime stubs have no scope 2298 if (method()->is_native()) return; // Ignore stub methods. 2299 // iterate through all interrupt point 2300 // and verify the debug information is valid. 2301 RelocIterator iter((nmethod*)this); 2302 while (iter.next()) { 2303 address stub = NULL; 2304 switch (iter.type()) { 2305 case relocInfo::virtual_call_type: 2306 verify_interrupt_point(iter.addr()); 2307 break; 2308 case relocInfo::opt_virtual_call_type: 2309 stub = iter.opt_virtual_call_reloc()->static_stub(); 2310 verify_interrupt_point(iter.addr()); 2311 break; 2312 case relocInfo::static_call_type: 2313 stub = iter.static_call_reloc()->static_stub(); 2314 //verify_interrupt_point(iter.addr()); 2315 break; 2316 case relocInfo::runtime_call_type: 2317 address destination = iter.reloc()->value(); 2318 // Right now there is no way to find out which entries support 2319 // an interrupt point. It would be nice if we had this 2320 // information in a table. 2321 break; 2322 } 2323 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section"); 2324 } 2325} 2326 2327 2328// ----------------------------------------------------------------------------- 2329// Non-product code 2330#ifndef PRODUCT 2331 2332class DebugScavengeRoot: public OopClosure { 2333 nmethod* _nm; 2334 bool _ok; 2335public: 2336 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { } 2337 bool ok() { return _ok; } 2338 virtual void do_oop(oop* p) { 2339 if ((*p) == NULL || !(*p)->is_scavengable()) return; 2340 if (_ok) { 2341 _nm->print_nmethod(true); 2342 _ok = false; 2343 } 2344 tty->print_cr("*** non-perm oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)", 2345 (intptr_t)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm)); 2346 (*p)->print(); 2347 } 2348 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2349}; 2350 2351void nmethod::verify_scavenge_root_oops() { 2352 if (!on_scavenge_root_list()) { 2353 // Actually look inside, to verify the claim that it's clean. 2354 DebugScavengeRoot debug_scavenge_root(this); 2355 oops_do(&debug_scavenge_root); 2356 if (!debug_scavenge_root.ok()) 2357 fatal("found an unadvertised bad non-perm oop in the code cache"); 2358 } 2359 assert(scavenge_root_not_marked(), ""); 2360} 2361 2362#endif // PRODUCT 2363 2364// Printing operations 2365 2366void nmethod::print() const { 2367 ResourceMark rm; 2368 ttyLocker ttyl; // keep the following output all in one block 2369 2370 tty->print("Compiled "); 2371 2372 if (is_compiled_by_c1()) { 2373 tty->print("(c1) "); 2374 } else if (is_compiled_by_c2()) { 2375 tty->print("(c2) "); 2376 } else if (is_compiled_by_shark()) { 2377 tty->print("(shark) "); 2378 } else { 2379 tty->print("(nm) "); 2380 } 2381 2382 print_on(tty, "nmethod"); 2383 tty->cr(); 2384 if (WizardMode) { 2385 tty->print("((nmethod*) "INTPTR_FORMAT ") ", this); 2386 tty->print(" for method " INTPTR_FORMAT , (address)method()); 2387 tty->print(" { "); 2388 if (is_in_use()) tty->print("in_use "); 2389 if (is_not_entrant()) tty->print("not_entrant "); 2390 if (is_zombie()) tty->print("zombie "); 2391 if (is_unloaded()) tty->print("unloaded "); 2392 if (on_scavenge_root_list()) tty->print("scavenge_root "); 2393 tty->print_cr("}:"); 2394 } 2395 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2396 (address)this, 2397 (address)this + size(), 2398 size()); 2399 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2400 relocation_begin(), 2401 relocation_end(), 2402 relocation_size()); 2403 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2404 consts_begin(), 2405 consts_end(), 2406 consts_size()); 2407 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2408 insts_begin(), 2409 insts_end(), 2410 insts_size()); 2411 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2412 stub_begin(), 2413 stub_end(), 2414 stub_size()); 2415 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2416 oops_begin(), 2417 oops_end(), 2418 oops_size()); 2419 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2420 scopes_data_begin(), 2421 scopes_data_end(), 2422 scopes_data_size()); 2423 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2424 scopes_pcs_begin(), 2425 scopes_pcs_end(), 2426 scopes_pcs_size()); 2427 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2428 dependencies_begin(), 2429 dependencies_end(), 2430 dependencies_size()); 2431 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2432 handler_table_begin(), 2433 handler_table_end(), 2434 handler_table_size()); 2435 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2436 nul_chk_table_begin(), 2437 nul_chk_table_end(), 2438 nul_chk_table_size()); 2439} 2440 2441void nmethod::print_code() { 2442 HandleMark hm; 2443 ResourceMark m; 2444 Disassembler::decode(this); 2445} 2446 2447 2448#ifndef PRODUCT 2449 2450void nmethod::print_scopes() { 2451 // Find the first pc desc for all scopes in the code and print it. 2452 ResourceMark rm; 2453 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2454 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null) 2455 continue; 2456 2457 ScopeDesc* sd = scope_desc_at(p->real_pc(this)); 2458 sd->print_on(tty, p); 2459 } 2460} 2461 2462void nmethod::print_dependencies() { 2463 ResourceMark rm; 2464 ttyLocker ttyl; // keep the following output all in one block 2465 tty->print_cr("Dependencies:"); 2466 for (Dependencies::DepStream deps(this); deps.next(); ) { 2467 deps.print_dependency(); 2468 klassOop ctxk = deps.context_type(); 2469 if (ctxk != NULL) { 2470 Klass* k = Klass::cast(ctxk); 2471 if (k->oop_is_instance() && ((instanceKlass*)k)->is_dependent_nmethod(this)) { 2472 tty->print_cr(" [nmethod<=klass]%s", k->external_name()); 2473 } 2474 } 2475 deps.log_dependency(); // put it into the xml log also 2476 } 2477} 2478 2479 2480void nmethod::print_relocations() { 2481 ResourceMark m; // in case methods get printed via the debugger 2482 tty->print_cr("relocations:"); 2483 RelocIterator iter(this); 2484 iter.print(); 2485 if (UseRelocIndex) { 2486 jint* index_end = (jint*)relocation_end() - 1; 2487 jint index_size = *index_end; 2488 jint* index_start = (jint*)( (address)index_end - index_size ); 2489 tty->print_cr(" index @" INTPTR_FORMAT ": index_size=%d", index_start, index_size); 2490 if (index_size > 0) { 2491 jint* ip; 2492 for (ip = index_start; ip+2 <= index_end; ip += 2) 2493 tty->print_cr(" (%d %d) addr=" INTPTR_FORMAT " @" INTPTR_FORMAT, 2494 ip[0], 2495 ip[1], 2496 header_end()+ip[0], 2497 relocation_begin()-1+ip[1]); 2498 for (; ip < index_end; ip++) 2499 tty->print_cr(" (%d ?)", ip[0]); 2500 tty->print_cr(" @" INTPTR_FORMAT ": index_size=%d", ip, *ip++); 2501 tty->print_cr("reloc_end @" INTPTR_FORMAT ":", ip); 2502 } 2503 } 2504} 2505 2506 2507void nmethod::print_pcs() { 2508 ResourceMark m; // in case methods get printed via debugger 2509 tty->print_cr("pc-bytecode offsets:"); 2510 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2511 p->print(this); 2512 } 2513} 2514 2515#endif // PRODUCT 2516 2517const char* nmethod::reloc_string_for(u_char* begin, u_char* end) { 2518 RelocIterator iter(this, begin, end); 2519 bool have_one = false; 2520 while (iter.next()) { 2521 have_one = true; 2522 switch (iter.type()) { 2523 case relocInfo::none: return "no_reloc"; 2524 case relocInfo::oop_type: { 2525 stringStream st; 2526 oop_Relocation* r = iter.oop_reloc(); 2527 oop obj = r->oop_value(); 2528 st.print("oop("); 2529 if (obj == NULL) st.print("NULL"); 2530 else obj->print_value_on(&st); 2531 st.print(")"); 2532 return st.as_string(); 2533 } 2534 case relocInfo::virtual_call_type: return "virtual_call"; 2535 case relocInfo::opt_virtual_call_type: return "optimized virtual_call"; 2536 case relocInfo::static_call_type: return "static_call"; 2537 case relocInfo::static_stub_type: return "static_stub"; 2538 case relocInfo::runtime_call_type: return "runtime_call"; 2539 case relocInfo::external_word_type: return "external_word"; 2540 case relocInfo::internal_word_type: return "internal_word"; 2541 case relocInfo::section_word_type: return "section_word"; 2542 case relocInfo::poll_type: return "poll"; 2543 case relocInfo::poll_return_type: return "poll_return"; 2544 case relocInfo::type_mask: return "type_bit_mask"; 2545 } 2546 } 2547 return have_one ? "other" : NULL; 2548} 2549 2550// Return a the last scope in (begin..end] 2551ScopeDesc* nmethod::scope_desc_in(address begin, address end) { 2552 PcDesc* p = pc_desc_near(begin+1); 2553 if (p != NULL && p->real_pc(this) <= end) { 2554 return new ScopeDesc(this, p->scope_decode_offset(), 2555 p->obj_decode_offset(), p->should_reexecute(), 2556 p->return_oop()); 2557 } 2558 return NULL; 2559} 2560 2561void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) { 2562 if (block_begin == entry_point()) stream->print_cr("[Entry Point]"); 2563 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]"); 2564 if (block_begin == exception_begin()) stream->print_cr("[Exception Handler]"); 2565 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]"); 2566 if (block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]"); 2567 2568 if (has_method_handle_invokes()) 2569 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]"); 2570 2571 if (block_begin == consts_begin()) stream->print_cr("[Constants]"); 2572 2573 if (block_begin == entry_point()) { 2574 methodHandle m = method(); 2575 if (m.not_null()) { 2576 stream->print(" # "); 2577 m->print_value_on(stream); 2578 stream->cr(); 2579 } 2580 if (m.not_null() && !is_osr_method()) { 2581 ResourceMark rm; 2582 int sizeargs = m->size_of_parameters(); 2583 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs); 2584 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs); 2585 { 2586 int sig_index = 0; 2587 if (!m->is_static()) 2588 sig_bt[sig_index++] = T_OBJECT; // 'this' 2589 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) { 2590 BasicType t = ss.type(); 2591 sig_bt[sig_index++] = t; 2592 if (type2size[t] == 2) { 2593 sig_bt[sig_index++] = T_VOID; 2594 } else { 2595 assert(type2size[t] == 1, "size is 1 or 2"); 2596 } 2597 } 2598 assert(sig_index == sizeargs, ""); 2599 } 2600 const char* spname = "sp"; // make arch-specific? 2601 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false); 2602 int stack_slot_offset = this->frame_size() * wordSize; 2603 int tab1 = 14, tab2 = 24; 2604 int sig_index = 0; 2605 int arg_index = (m->is_static() ? 0 : -1); 2606 bool did_old_sp = false; 2607 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) { 2608 bool at_this = (arg_index == -1); 2609 bool at_old_sp = false; 2610 BasicType t = (at_this ? T_OBJECT : ss.type()); 2611 assert(t == sig_bt[sig_index], "sigs in sync"); 2612 if (at_this) 2613 stream->print(" # this: "); 2614 else 2615 stream->print(" # parm%d: ", arg_index); 2616 stream->move_to(tab1); 2617 VMReg fst = regs[sig_index].first(); 2618 VMReg snd = regs[sig_index].second(); 2619 if (fst->is_reg()) { 2620 stream->print("%s", fst->name()); 2621 if (snd->is_valid()) { 2622 stream->print(":%s", snd->name()); 2623 } 2624 } else if (fst->is_stack()) { 2625 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset; 2626 if (offset == stack_slot_offset) at_old_sp = true; 2627 stream->print("[%s+0x%x]", spname, offset); 2628 } else { 2629 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd); 2630 } 2631 stream->print(" "); 2632 stream->move_to(tab2); 2633 stream->print("= "); 2634 if (at_this) { 2635 m->method_holder()->print_value_on(stream); 2636 } else { 2637 bool did_name = false; 2638 if (!at_this && ss.is_object()) { 2639 Symbol* name = ss.as_symbol_or_null(); 2640 if (name != NULL) { 2641 name->print_value_on(stream); 2642 did_name = true; 2643 } 2644 } 2645 if (!did_name) 2646 stream->print("%s", type2name(t)); 2647 } 2648 if (at_old_sp) { 2649 stream->print(" (%s of caller)", spname); 2650 did_old_sp = true; 2651 } 2652 stream->cr(); 2653 sig_index += type2size[t]; 2654 arg_index += 1; 2655 if (!at_this) ss.next(); 2656 } 2657 if (!did_old_sp) { 2658 stream->print(" # "); 2659 stream->move_to(tab1); 2660 stream->print("[%s+0x%x]", spname, stack_slot_offset); 2661 stream->print(" (%s of caller)", spname); 2662 stream->cr(); 2663 } 2664 } 2665 } 2666} 2667 2668void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) { 2669 // First, find an oopmap in (begin, end]. 2670 // We use the odd half-closed interval so that oop maps and scope descs 2671 // which are tied to the byte after a call are printed with the call itself. 2672 address base = code_begin(); 2673 OopMapSet* oms = oop_maps(); 2674 if (oms != NULL) { 2675 for (int i = 0, imax = oms->size(); i < imax; i++) { 2676 OopMap* om = oms->at(i); 2677 address pc = base + om->offset(); 2678 if (pc > begin) { 2679 if (pc <= end) { 2680 st->move_to(column); 2681 st->print("; "); 2682 om->print_on(st); 2683 } 2684 break; 2685 } 2686 } 2687 } 2688 2689 // Print any debug info present at this pc. 2690 ScopeDesc* sd = scope_desc_in(begin, end); 2691 if (sd != NULL) { 2692 st->move_to(column); 2693 if (sd->bci() == SynchronizationEntryBCI) { 2694 st->print(";*synchronization entry"); 2695 } else { 2696 if (sd->method().is_null()) { 2697 st->print("method is NULL"); 2698 } else if (sd->method()->is_native()) { 2699 st->print("method is native"); 2700 } else { 2701 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci()); 2702 st->print(";*%s", Bytecodes::name(bc)); 2703 switch (bc) { 2704 case Bytecodes::_invokevirtual: 2705 case Bytecodes::_invokespecial: 2706 case Bytecodes::_invokestatic: 2707 case Bytecodes::_invokeinterface: 2708 { 2709 Bytecode_invoke invoke(sd->method(), sd->bci()); 2710 st->print(" "); 2711 if (invoke.name() != NULL) 2712 invoke.name()->print_symbol_on(st); 2713 else 2714 st->print("<UNKNOWN>"); 2715 break; 2716 } 2717 case Bytecodes::_getfield: 2718 case Bytecodes::_putfield: 2719 case Bytecodes::_getstatic: 2720 case Bytecodes::_putstatic: 2721 { 2722 Bytecode_field field(sd->method(), sd->bci()); 2723 st->print(" "); 2724 if (field.name() != NULL) 2725 field.name()->print_symbol_on(st); 2726 else 2727 st->print("<UNKNOWN>"); 2728 } 2729 } 2730 } 2731 } 2732 2733 // Print all scopes 2734 for (;sd != NULL; sd = sd->sender()) { 2735 st->move_to(column); 2736 st->print("; -"); 2737 if (sd->method().is_null()) { 2738 st->print("method is NULL"); 2739 } else { 2740 sd->method()->print_short_name(st); 2741 } 2742 int lineno = sd->method()->line_number_from_bci(sd->bci()); 2743 if (lineno != -1) { 2744 st->print("@%d (line %d)", sd->bci(), lineno); 2745 } else { 2746 st->print("@%d", sd->bci()); 2747 } 2748 st->cr(); 2749 } 2750 } 2751 2752 // Print relocation information 2753 const char* str = reloc_string_for(begin, end); 2754 if (str != NULL) { 2755 if (sd != NULL) st->cr(); 2756 st->move_to(column); 2757 st->print("; {%s}", str); 2758 } 2759 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin()); 2760 if (cont_offset != 0) { 2761 st->move_to(column); 2762 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, code_begin() + cont_offset); 2763 } 2764 2765} 2766 2767#ifndef PRODUCT 2768 2769void nmethod::print_value_on(outputStream* st) const { 2770 print_on(st, "nmethod"); 2771} 2772 2773void nmethod::print_calls(outputStream* st) { 2774 RelocIterator iter(this); 2775 while (iter.next()) { 2776 switch (iter.type()) { 2777 case relocInfo::virtual_call_type: 2778 case relocInfo::opt_virtual_call_type: { 2779 VerifyMutexLocker mc(CompiledIC_lock); 2780 CompiledIC_at(iter.reloc())->print(); 2781 break; 2782 } 2783 case relocInfo::static_call_type: 2784 st->print_cr("Static call at " INTPTR_FORMAT, iter.reloc()->addr()); 2785 compiledStaticCall_at(iter.reloc())->print(); 2786 break; 2787 } 2788 } 2789} 2790 2791void nmethod::print_handler_table() { 2792 ExceptionHandlerTable(this).print(); 2793} 2794 2795void nmethod::print_nul_chk_table() { 2796 ImplicitExceptionTable(this).print(code_begin()); 2797} 2798 2799void nmethod::print_statistics() { 2800 ttyLocker ttyl; 2801 if (xtty != NULL) xtty->head("statistics type='nmethod'"); 2802 nmethod_stats.print_native_nmethod_stats(); 2803 nmethod_stats.print_nmethod_stats(); 2804 DebugInformationRecorder::print_statistics(); 2805 nmethod_stats.print_pc_stats(); 2806 Dependencies::print_statistics(); 2807 if (xtty != NULL) xtty->tail("statistics"); 2808} 2809 2810#endif // PRODUCT 2811