1 /* 2 * Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "code/compiledIC.hpp" 27 #include "code/compiledMethod.inline.hpp" 28 #include "code/scopeDesc.hpp" 29 #include "code/codeCache.hpp" 30 #include "prims/methodHandles.hpp" 31 #include "interpreter/bytecode.hpp" 32 #include "memory/resourceArea.hpp" 33 #include "runtime/mutexLocker.hpp" 34 35 CompiledMethod::CompiledMethod(Method* method, const char* name, CompilerType type, const CodeBlobLayout& layout, int frame_complete_offset, int frame_size, ImmutableOopMapSet* oop_maps, bool caller_must_gc_arguments) 36 : CodeBlob(name, type, layout, frame_complete_offset, frame_size, oop_maps, caller_must_gc_arguments), 37 _method(method), _mark_for_deoptimization_status(not_marked) { 38 init_defaults(); 39 } 40 41 CompiledMethod::CompiledMethod(Method* method, const char* name, CompilerType type, int size, int header_size, CodeBuffer* cb, int frame_complete_offset, int frame_size, OopMapSet* oop_maps, bool caller_must_gc_arguments) 42 : CodeBlob(name, type, CodeBlobLayout((address) this, size, header_size, cb), cb, frame_complete_offset, frame_size, oop_maps, caller_must_gc_arguments), 43 _method(method), _mark_for_deoptimization_status(not_marked) { 44 init_defaults(); 45 } 46 47 void CompiledMethod::init_defaults() { 48 _has_unsafe_access = 0; 49 _has_method_handle_invokes = 0; 50 _lazy_critical_native = 0; 51 _has_wide_vectors = 0; 52 _unloading_clock = 0; 53 } 54 55 bool CompiledMethod::is_method_handle_return(address return_pc) { 56 if (!has_method_handle_invokes()) return false; 57 PcDesc* pd = pc_desc_at(return_pc); 58 if (pd == NULL) 59 return false; 60 return pd->is_method_handle_invoke(); 61 } 62 63 // Returns a string version of the method state. 64 const char* CompiledMethod::state() const { 65 int state = get_state(); 66 switch (state) { 67 case in_use: 68 return "in use"; 69 case not_used: 70 return "not_used"; 71 case not_entrant: 72 return "not_entrant"; 73 case zombie: 74 return "zombie"; 75 case unloaded: 76 return "unloaded"; 77 default: 78 fatal("unexpected method state: %d", state); 79 return NULL; 80 } 81 } 82 83 //----------------------------------------------------------------------------- 84 85 void CompiledMethod::add_exception_cache_entry(ExceptionCache* new_entry) { 86 assert(ExceptionCache_lock->owned_by_self(),"Must hold the ExceptionCache_lock"); 87 assert(new_entry != NULL,"Must be non null"); 88 assert(new_entry->next() == NULL, "Must be null"); 89 90 ExceptionCache *ec = exception_cache(); 91 if (ec != NULL) { 92 new_entry->set_next(ec); 93 } 94 release_set_exception_cache(new_entry); 95 } 96 97 void CompiledMethod::clean_exception_cache(BoolObjectClosure* is_alive) { 98 ExceptionCache* prev = NULL; 99 ExceptionCache* curr = exception_cache(); 100 101 while (curr != NULL) { 102 ExceptionCache* next = curr->next(); 103 104 Klass* ex_klass = curr->exception_type(); 105 if (ex_klass != NULL && !ex_klass->is_loader_alive(is_alive)) { 106 if (prev == NULL) { 107 set_exception_cache(next); 108 } else { 109 prev->set_next(next); 110 } 111 delete curr; 112 // prev stays the same. 113 } else { 114 prev = curr; 115 } 116 117 curr = next; 118 } 119 } 120 121 // public method for accessing the exception cache 122 // These are the public access methods. 123 address CompiledMethod::handler_for_exception_and_pc(Handle exception, address pc) { 124 // We never grab a lock to read the exception cache, so we may 125 // have false negatives. This is okay, as it can only happen during 126 // the first few exception lookups for a given nmethod. 127 ExceptionCache* ec = exception_cache(); 128 while (ec != NULL) { 129 address ret_val; 130 if ((ret_val = ec->match(exception,pc)) != NULL) { 131 return ret_val; 132 } 133 ec = ec->next(); 134 } 135 return NULL; 136 } 137 138 void CompiledMethod::add_handler_for_exception_and_pc(Handle exception, address pc, address handler) { 139 // There are potential race conditions during exception cache updates, so we 140 // must own the ExceptionCache_lock before doing ANY modifications. Because 141 // we don't lock during reads, it is possible to have several threads attempt 142 // to update the cache with the same data. We need to check for already inserted 143 // copies of the current data before adding it. 144 145 MutexLocker ml(ExceptionCache_lock); 146 ExceptionCache* target_entry = exception_cache_entry_for_exception(exception); 147 148 if (target_entry == NULL || !target_entry->add_address_and_handler(pc,handler)) { 149 target_entry = new ExceptionCache(exception,pc,handler); 150 add_exception_cache_entry(target_entry); 151 } 152 } 153 154 //-------------end of code for ExceptionCache-------------- 155 156 // private method for handling exception cache 157 // These methods are private, and used to manipulate the exception cache 158 // directly. 159 ExceptionCache* CompiledMethod::exception_cache_entry_for_exception(Handle exception) { 160 ExceptionCache* ec = exception_cache(); 161 while (ec != NULL) { 162 if (ec->match_exception_with_space(exception)) { 163 return ec; 164 } 165 ec = ec->next(); 166 } 167 return NULL; 168 } 169 170 bool CompiledMethod::is_at_poll_return(address pc) { 171 RelocIterator iter(this, pc, pc+1); 172 while (iter.next()) { 173 if (iter.type() == relocInfo::poll_return_type) 174 return true; 175 } 176 return false; 177 } 178 179 180 bool CompiledMethod::is_at_poll_or_poll_return(address pc) { 181 RelocIterator iter(this, pc, pc+1); 182 while (iter.next()) { 183 relocInfo::relocType t = iter.type(); 184 if (t == relocInfo::poll_return_type || t == relocInfo::poll_type) 185 return true; 186 } 187 return false; 188 } 189 190 void CompiledMethod::verify_oop_relocations() { 191 // Ensure sure that the code matches the current oop values 192 RelocIterator iter(this, NULL, NULL); 193 while (iter.next()) { 194 if (iter.type() == relocInfo::oop_type) { 195 oop_Relocation* reloc = iter.oop_reloc(); 196 if (!reloc->oop_is_immediate()) { 197 reloc->verify_oop_relocation(); 198 } 199 } 200 } 201 } 202 203 204 ScopeDesc* CompiledMethod::scope_desc_at(address pc) { 205 PcDesc* pd = pc_desc_at(pc); 206 guarantee(pd != NULL, "scope must be present"); 207 return new ScopeDesc(this, pd->scope_decode_offset(), 208 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(), 209 pd->return_oop()); 210 } 211 212 ScopeDesc* CompiledMethod::scope_desc_near(address pc) { 213 PcDesc* pd = pc_desc_near(pc); 214 guarantee(pd != NULL, "scope must be present"); 215 return new ScopeDesc(this, pd->scope_decode_offset(), 216 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(), 217 pd->return_oop()); 218 } 219 220 void CompiledMethod::cleanup_inline_caches(bool clean_all/*=false*/) { 221 assert_locked_or_safepoint(CompiledIC_lock); 222 223 // If the method is not entrant or zombie then a JMP is plastered over the 224 // first few bytes. If an oop in the old code was there, that oop 225 // should not get GC'd. Skip the first few bytes of oops on 226 // not-entrant methods. 227 address low_boundary = verified_entry_point(); 228 if (!is_in_use() && is_nmethod()) { 229 low_boundary += NativeJump::instruction_size; 230 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 231 // This means that the low_boundary is going to be a little too high. 232 // This shouldn't matter, since oops of non-entrant methods are never used. 233 // In fact, why are we bothering to look at oops in a non-entrant method?? 234 } 235 236 // Find all calls in an nmethod and clear the ones that point to non-entrant, 237 // zombie and unloaded nmethods. 238 ResourceMark rm; 239 RelocIterator iter(this, low_boundary); 240 while(iter.next()) { 241 switch(iter.type()) { 242 case relocInfo::virtual_call_type: 243 case relocInfo::opt_virtual_call_type: { 244 CompiledIC *ic = CompiledIC_at(&iter); 245 // Ok, to lookup references to zombies here 246 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination()); 247 if( cb != NULL && cb->is_compiled() ) { 248 CompiledMethod* nm = cb->as_compiled_method(); 249 // Clean inline caches pointing to zombie, non-entrant and unloaded methods 250 if (clean_all || !nm->is_in_use() || (nm->method()->code() != nm)) ic->set_to_clean(is_alive()); 251 } 252 break; 253 } 254 case relocInfo::static_call_type: { 255 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc()); 256 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination()); 257 if( cb != NULL && cb->is_compiled() ) { 258 CompiledMethod* cm = cb->as_compiled_method(); 259 // Clean inline caches pointing to zombie, non-entrant and unloaded methods 260 if (clean_all || !cm->is_in_use() || (cm->method()->code() != cm)) { 261 csc->set_to_clean(); 262 } 263 } 264 break; 265 } 266 default: 267 break; 268 } 269 } 270 } 271 272 int CompiledMethod::verify_icholder_relocations() { 273 ResourceMark rm; 274 int count = 0; 275 276 RelocIterator iter(this); 277 while(iter.next()) { 278 if (iter.type() == relocInfo::virtual_call_type) { 279 if (CompiledIC::is_icholder_call_site(iter.virtual_call_reloc(), this)) { 280 CompiledIC *ic = CompiledIC_at(&iter); 281 if (TraceCompiledIC) { 282 tty->print("noticed icholder " INTPTR_FORMAT " ", p2i(ic->cached_icholder())); 283 ic->print(); 284 } 285 assert(ic->cached_icholder() != NULL, "must be non-NULL"); 286 count++; 287 } 288 } 289 } 290 291 return count; 292 } 293 294 // Method that knows how to preserve outgoing arguments at call. This method must be 295 // called with a frame corresponding to a Java invoke 296 void CompiledMethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { 297 if (method() != NULL && !method()->is_native()) { 298 address pc = fr.pc(); 299 SimpleScopeDesc ssd(this, pc); 300 Bytecode_invoke call(ssd.method(), ssd.bci()); 301 bool has_receiver = call.has_receiver(); 302 bool has_appendix = call.has_appendix(); 303 Symbol* signature = call.signature(); 304 305 // The method attached by JIT-compilers should be used, if present. 306 // Bytecode can be inaccurate in such case. 307 Method* callee = attached_method_before_pc(pc); 308 if (callee != NULL) { 309 has_receiver = !(callee->access_flags().is_static()); 310 has_appendix = false; 311 signature = callee->signature(); 312 } 313 314 fr.oops_compiled_arguments_do(signature, has_receiver, has_appendix, reg_map, f); 315 } 316 } 317 318 Method* CompiledMethod::attached_method(address call_instr) { 319 assert(code_contains(call_instr), "not part of the nmethod"); 320 RelocIterator iter(this, call_instr, call_instr + 1); 321 while (iter.next()) { 322 if (iter.addr() == call_instr) { 323 switch(iter.type()) { 324 case relocInfo::static_call_type: return iter.static_call_reloc()->method_value(); 325 case relocInfo::opt_virtual_call_type: return iter.opt_virtual_call_reloc()->method_value(); 326 case relocInfo::virtual_call_type: return iter.virtual_call_reloc()->method_value(); 327 default: break; 328 } 329 } 330 } 331 return NULL; // not found 332 } 333 334 Method* CompiledMethod::attached_method_before_pc(address pc) { 335 if (NativeCall::is_call_before(pc)) { 336 NativeCall* ncall = nativeCall_before(pc); 337 return attached_method(ncall->instruction_address()); 338 } 339 return NULL; // not a call 340 } 341 342 void CompiledMethod::clear_inline_caches() { 343 assert(SafepointSynchronize::is_at_safepoint(), "cleaning of IC's only allowed at safepoint"); 344 if (is_zombie()) { 345 return; 346 } 347 348 RelocIterator iter(this); 349 while (iter.next()) { 350 iter.reloc()->clear_inline_cache(); 351 } 352 } 353 354 // Clear ICStubs of all compiled ICs 355 void CompiledMethod::clear_ic_stubs() { 356 assert_locked_or_safepoint(CompiledIC_lock); 357 RelocIterator iter(this); 358 while(iter.next()) { 359 if (iter.type() == relocInfo::virtual_call_type) { 360 CompiledIC* ic = CompiledIC_at(&iter); 361 ic->clear_ic_stub(); 362 } 363 } 364 } 365 366 #ifdef ASSERT 367 368 class CheckClass : AllStatic { 369 static BoolObjectClosure* _is_alive; 370 371 // Check class_loader is alive for this bit of metadata. 372 static void check_class(Metadata* md) { 373 Klass* klass = NULL; 374 if (md->is_klass()) { 375 klass = ((Klass*)md); 376 } else if (md->is_method()) { 377 klass = ((Method*)md)->method_holder(); 378 } else if (md->is_methodData()) { 379 klass = ((MethodData*)md)->method()->method_holder(); 380 } else { 381 md->print(); 382 ShouldNotReachHere(); 383 } 384 assert(klass->is_loader_alive(_is_alive), "must be alive"); 385 } 386 public: 387 static void do_check_class(BoolObjectClosure* is_alive, CompiledMethod* nm) { 388 assert(SafepointSynchronize::is_at_safepoint(), "this is only ok at safepoint"); 389 _is_alive = is_alive; 390 nm->metadata_do(check_class); 391 } 392 }; 393 394 // This is called during a safepoint so can use static data 395 BoolObjectClosure* CheckClass::_is_alive = NULL; 396 #endif // ASSERT 397 398 399 void CompiledMethod::clean_ic_if_metadata_is_dead(CompiledIC *ic, BoolObjectClosure *is_alive) { 400 if (ic->is_icholder_call()) { 401 // The only exception is compiledICHolder oops which may 402 // yet be marked below. (We check this further below). 403 CompiledICHolder* cichk_oop = ic->cached_icholder(); 404 405 if (cichk_oop->holder_method()->method_holder()->is_loader_alive(is_alive) && 406 cichk_oop->holder_klass()->is_loader_alive(is_alive)) { 407 return; 408 } 409 } else { 410 Metadata* ic_oop = ic->cached_metadata(); 411 if (ic_oop != NULL) { 412 if (ic_oop->is_klass()) { 413 if (((Klass*)ic_oop)->is_loader_alive(is_alive)) { 414 return; 415 } 416 } else if (ic_oop->is_method()) { 417 if (((Method*)ic_oop)->method_holder()->is_loader_alive(is_alive)) { 418 return; 419 } 420 } else { 421 ShouldNotReachHere(); 422 } 423 } 424 } 425 426 ic->set_to_clean(); 427 } 428 429 unsigned char CompiledMethod::_global_unloading_clock = 0; 430 431 void CompiledMethod::increase_unloading_clock() { 432 _global_unloading_clock++; 433 if (_global_unloading_clock == 0) { 434 // _nmethods are allocated with _unloading_clock == 0, 435 // so 0 is never used as a clock value. 436 _global_unloading_clock = 1; 437 } 438 } 439 440 void CompiledMethod::set_unloading_clock(unsigned char unloading_clock) { 441 OrderAccess::release_store((volatile jubyte*)&_unloading_clock, unloading_clock); 442 } 443 444 unsigned char CompiledMethod::unloading_clock() { 445 return (unsigned char)OrderAccess::load_acquire((volatile jubyte*)&_unloading_clock); 446 } 447 448 // Processing of oop references should have been sufficient to keep 449 // all strong references alive. Any weak references should have been 450 // cleared as well. Visit all the metadata and ensure that it's 451 // really alive. 452 void CompiledMethod::verify_metadata_loaders(address low_boundary, BoolObjectClosure* is_alive) { 453 #ifdef ASSERT 454 RelocIterator iter(this, low_boundary); 455 while (iter.next()) { 456 // static_stub_Relocations may have dangling references to 457 // Method*s so trim them out here. Otherwise it looks like 458 // compiled code is maintaining a link to dead metadata. 459 address static_call_addr = NULL; 460 if (iter.type() == relocInfo::opt_virtual_call_type) { 461 CompiledIC* cic = CompiledIC_at(&iter); 462 if (!cic->is_call_to_interpreted()) { 463 static_call_addr = iter.addr(); 464 } 465 } else if (iter.type() == relocInfo::static_call_type) { 466 CompiledStaticCall* csc = compiledStaticCall_at(iter.reloc()); 467 if (!csc->is_call_to_interpreted()) { 468 static_call_addr = iter.addr(); 469 } 470 } 471 if (static_call_addr != NULL) { 472 RelocIterator sciter(this, low_boundary); 473 while (sciter.next()) { 474 if (sciter.type() == relocInfo::static_stub_type && 475 sciter.static_stub_reloc()->static_call() == static_call_addr) { 476 sciter.static_stub_reloc()->clear_inline_cache(); 477 } 478 } 479 } 480 } 481 // Check that the metadata embedded in the nmethod is alive 482 CheckClass::do_check_class(is_alive, this); 483 #endif 484 } 485 486 // This is called at the end of the strong tracing/marking phase of a 487 // GC to unload an nmethod if it contains otherwise unreachable 488 // oops. 489 490 void CompiledMethod::do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred) { 491 // Make sure the oop's ready to receive visitors 492 assert(!is_zombie() && !is_unloaded(), 493 "should not call follow on zombie or unloaded nmethod"); 494 495 // If the method is not entrant then a JMP is plastered over the 496 // first few bytes. If an oop in the old code was there, that oop 497 // should not get GC'd. Skip the first few bytes of oops on 498 // not-entrant methods. 499 address low_boundary = verified_entry_point(); 500 if (is_not_entrant()) { 501 low_boundary += NativeJump::instruction_size; 502 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 503 // (See comment above.) 504 } 505 506 // The RedefineClasses() API can cause the class unloading invariant 507 // to no longer be true. See jvmtiExport.hpp for details. 508 // Also, leave a debugging breadcrumb in local flag. 509 if (JvmtiExport::has_redefined_a_class()) { 510 // This set of the unloading_occurred flag is done before the 511 // call to post_compiled_method_unload() so that the unloading 512 // of this nmethod is reported. 513 unloading_occurred = true; 514 } 515 516 // Exception cache 517 clean_exception_cache(is_alive); 518 519 // If class unloading occurred we first iterate over all inline caches and 520 // clear ICs where the cached oop is referring to an unloaded klass or method. 521 // The remaining live cached oops will be traversed in the relocInfo::oop_type 522 // iteration below. 523 if (unloading_occurred) { 524 RelocIterator iter(this, low_boundary); 525 while(iter.next()) { 526 if (iter.type() == relocInfo::virtual_call_type) { 527 CompiledIC *ic = CompiledIC_at(&iter); 528 clean_ic_if_metadata_is_dead(ic, is_alive); 529 } 530 } 531 } 532 533 if (do_unloading_oops(low_boundary, is_alive, unloading_occurred)) { 534 return; 535 } 536 537 #if INCLUDE_JVMCI 538 if (do_unloading_jvmci(is_alive, unloading_occurred)) { 539 return; 540 } 541 #endif 542 543 // Ensure that all metadata is still alive 544 verify_metadata_loaders(low_boundary, is_alive); 545 } 546 547 template <class CompiledICorStaticCall> 548 static bool clean_if_nmethod_is_unloaded(CompiledICorStaticCall *ic, address addr, BoolObjectClosure *is_alive, CompiledMethod* from) { 549 // Ok, to lookup references to zombies here 550 CodeBlob *cb = CodeCache::find_blob_unsafe(addr); 551 CompiledMethod* nm = (cb != NULL) ? cb->as_compiled_method_or_null() : NULL; 552 if (nm != NULL) { 553 if (nm->unloading_clock() != CompiledMethod::global_unloading_clock()) { 554 // The nmethod has not been processed yet. 555 return true; 556 } 557 558 // Clean inline caches pointing to both zombie and not_entrant methods 559 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 560 ic->set_to_clean(); 561 assert(ic->is_clean(), "nmethod " PTR_FORMAT "not clean %s", p2i(from), from->method()->name_and_sig_as_C_string()); 562 } 563 } 564 565 return false; 566 } 567 568 static bool clean_if_nmethod_is_unloaded(CompiledIC *ic, BoolObjectClosure *is_alive, CompiledMethod* from) { 569 return clean_if_nmethod_is_unloaded(ic, ic->ic_destination(), is_alive, from); 570 } 571 572 static bool clean_if_nmethod_is_unloaded(CompiledStaticCall *csc, BoolObjectClosure *is_alive, CompiledMethod* from) { 573 return clean_if_nmethod_is_unloaded(csc, csc->destination(), is_alive, from); 574 } 575 576 bool CompiledMethod::do_unloading_parallel(BoolObjectClosure* is_alive, bool unloading_occurred) { 577 ResourceMark rm; 578 579 // Make sure the oop's ready to receive visitors 580 assert(!is_zombie() && !is_unloaded(), 581 "should not call follow on zombie or unloaded nmethod"); 582 583 // If the method is not entrant then a JMP is plastered over the 584 // first few bytes. If an oop in the old code was there, that oop 585 // should not get GC'd. Skip the first few bytes of oops on 586 // not-entrant methods. 587 address low_boundary = verified_entry_point(); 588 if (is_not_entrant()) { 589 low_boundary += NativeJump::instruction_size; 590 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 591 // (See comment above.) 592 } 593 594 // The RedefineClasses() API can cause the class unloading invariant 595 // to no longer be true. See jvmtiExport.hpp for details. 596 // Also, leave a debugging breadcrumb in local flag. 597 if (JvmtiExport::has_redefined_a_class()) { 598 // This set of the unloading_occurred flag is done before the 599 // call to post_compiled_method_unload() so that the unloading 600 // of this nmethod is reported. 601 unloading_occurred = true; 602 } 603 604 // Exception cache 605 clean_exception_cache(is_alive); 606 607 bool postponed = false; 608 609 RelocIterator iter(this, low_boundary); 610 while(iter.next()) { 611 612 switch (iter.type()) { 613 614 case relocInfo::virtual_call_type: 615 if (unloading_occurred) { 616 // If class unloading occurred we first iterate over all inline caches and 617 // clear ICs where the cached oop is referring to an unloaded klass or method. 618 clean_ic_if_metadata_is_dead(CompiledIC_at(&iter), is_alive); 619 } 620 621 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this); 622 break; 623 624 case relocInfo::opt_virtual_call_type: 625 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this); 626 break; 627 628 case relocInfo::static_call_type: 629 postponed |= clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this); 630 break; 631 632 case relocInfo::oop_type: 633 // handled by do_unloading_oops below 634 break; 635 636 case relocInfo::metadata_type: 637 break; // nothing to do. 638 639 default: 640 break; 641 } 642 } 643 644 if (do_unloading_oops(low_boundary, is_alive, unloading_occurred)) { 645 return postponed; 646 } 647 648 #if INCLUDE_JVMCI 649 if (do_unloading_jvmci(is_alive, unloading_occurred)) { 650 return postponed; 651 } 652 #endif 653 654 // Ensure that all metadata is still alive 655 verify_metadata_loaders(low_boundary, is_alive); 656 657 return postponed; 658 } 659 660 void CompiledMethod::do_unloading_parallel_postponed(BoolObjectClosure* is_alive, bool unloading_occurred) { 661 ResourceMark rm; 662 663 // Make sure the oop's ready to receive visitors 664 assert(!is_zombie(), 665 "should not call follow on zombie nmethod"); 666 667 // If the method is not entrant then a JMP is plastered over the 668 // first few bytes. If an oop in the old code was there, that oop 669 // should not get GC'd. Skip the first few bytes of oops on 670 // not-entrant methods. 671 address low_boundary = verified_entry_point(); 672 if (is_not_entrant()) { 673 low_boundary += NativeJump::instruction_size; 674 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 675 // (See comment above.) 676 } 677 678 RelocIterator iter(this, low_boundary); 679 while(iter.next()) { 680 681 switch (iter.type()) { 682 683 case relocInfo::virtual_call_type: 684 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this); 685 break; 686 687 case relocInfo::opt_virtual_call_type: 688 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this); 689 break; 690 691 case relocInfo::static_call_type: 692 clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this); 693 break; 694 695 default: 696 break; 697 } 698 } 699 }