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/scopeDesc.hpp"
28 #include "code/codeCache.hpp"
29 #include "prims/methodHandles.hpp"
30 #include "interpreter/bytecode.hpp"
31 #include "memory/resourceArea.hpp"
32 #include "runtime/mutexLocker.hpp"
33
34 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)
35 : CodeBlob(name, type, layout, frame_complete_offset, frame_size, oop_maps, caller_must_gc_arguments),
36 _method(method), _mark_for_deoptimization_status(not_marked) {
37 init_defaults();
38 }
39
40 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)
41 : CodeBlob(name, type, CodeBlobLayout((address) this, size, header_size, cb), cb, frame_complete_offset, frame_size, oop_maps, caller_must_gc_arguments),
42 _method(method), _mark_for_deoptimization_status(not_marked) {
43 init_defaults();
44 }
45
46 void CompiledMethod::init_defaults() {
47 _has_unsafe_access = 0;
48 _has_method_handle_invokes = 0;
49 _lazy_critical_native = 0;
50 _has_wide_vectors = 0;
51 _unloading_clock = 0;
52 }
53
54 bool CompiledMethod::is_method_handle_return(address return_pc) {
55 if (!has_method_handle_invokes()) return false;
56 PcDesc* pd = pc_desc_at(return_pc);
57 if (pd == NULL)
58 return false;
59 return pd->is_method_handle_invoke();
60 }
61
62 // When using JVMCI the address might be off by the size of a call instruction.
63 bool CompiledMethod::is_deopt_entry(address pc) {
64 return pc == deopt_handler_begin()
65 #if INCLUDE_JVMCI
66 || (is_compiled_by_jvmci() && pc == (deopt_handler_begin() + NativeCall::instruction_size))
67 #endif
68 ;
69 }
70
71 // Returns a string version of the method state.
72 const char* CompiledMethod::state() const {
73 int state = get_state();
74 switch (state) {
75 case in_use:
76 return "in use";
77 case not_used:
78 return "not_used";
79 case not_entrant:
80 return "not_entrant";
81 case zombie:
82 return "zombie";
83 case unloaded:
84 return "unloaded";
85 default:
86 fatal("unexpected method state: %d", state);
87 return NULL;
88 }
89 }
90
91 //-----------------------------------------------------------------------------
92
93 void CompiledMethod::add_exception_cache_entry(ExceptionCache* new_entry) {
94 assert(ExceptionCache_lock->owned_by_self(),"Must hold the ExceptionCache_lock");
95 assert(new_entry != NULL,"Must be non null");
96 assert(new_entry->next() == NULL, "Must be null");
97
98 ExceptionCache *ec = exception_cache();
99 if (ec != NULL) {
100 new_entry->set_next(ec);
101 }
102 release_set_exception_cache(new_entry);
103 }
104
105 void CompiledMethod::clean_exception_cache(BoolObjectClosure* is_alive) {
106 ExceptionCache* prev = NULL;
107 ExceptionCache* curr = exception_cache();
108
109 while (curr != NULL) {
110 ExceptionCache* next = curr->next();
111
112 Klass* ex_klass = curr->exception_type();
113 if (ex_klass != NULL && !ex_klass->is_loader_alive(is_alive)) {
114 if (prev == NULL) {
115 set_exception_cache(next);
116 } else {
117 prev->set_next(next);
118 }
119 delete curr;
120 // prev stays the same.
121 } else {
122 prev = curr;
123 }
124
125 curr = next;
126 }
127 }
128
129 // public method for accessing the exception cache
130 // These are the public access methods.
131 address CompiledMethod::handler_for_exception_and_pc(Handle exception, address pc) {
132 // We never grab a lock to read the exception cache, so we may
133 // have false negatives. This is okay, as it can only happen during
134 // the first few exception lookups for a given nmethod.
135 ExceptionCache* ec = exception_cache();
136 while (ec != NULL) {
137 address ret_val;
138 if ((ret_val = ec->match(exception,pc)) != NULL) {
139 return ret_val;
140 }
141 ec = ec->next();
142 }
143 return NULL;
144 }
145
146 void CompiledMethod::add_handler_for_exception_and_pc(Handle exception, address pc, address handler) {
147 // There are potential race conditions during exception cache updates, so we
148 // must own the ExceptionCache_lock before doing ANY modifications. Because
149 // we don't lock during reads, it is possible to have several threads attempt
150 // to update the cache with the same data. We need to check for already inserted
151 // copies of the current data before adding it.
152
153 MutexLocker ml(ExceptionCache_lock);
154 ExceptionCache* target_entry = exception_cache_entry_for_exception(exception);
155
156 if (target_entry == NULL || !target_entry->add_address_and_handler(pc,handler)) {
157 target_entry = new ExceptionCache(exception,pc,handler);
158 add_exception_cache_entry(target_entry);
159 }
160 }
161
162 //-------------end of code for ExceptionCache--------------
163
164 // private method for handling exception cache
165 // These methods are private, and used to manipulate the exception cache
166 // directly.
167 ExceptionCache* CompiledMethod::exception_cache_entry_for_exception(Handle exception) {
168 ExceptionCache* ec = exception_cache();
169 while (ec != NULL) {
170 if (ec->match_exception_with_space(exception)) {
171 return ec;
172 }
173 ec = ec->next();
174 }
175 return NULL;
176 }
177
178 bool CompiledMethod::is_at_poll_return(address pc) {
179 RelocIterator iter(this, pc, pc+1);
180 while (iter.next()) {
181 if (iter.type() == relocInfo::poll_return_type)
182 return true;
183 }
184 return false;
185 }
186
187
188 bool CompiledMethod::is_at_poll_or_poll_return(address pc) {
189 RelocIterator iter(this, pc, pc+1);
190 while (iter.next()) {
191 relocInfo::relocType t = iter.type();
192 if (t == relocInfo::poll_return_type || t == relocInfo::poll_type)
193 return true;
194 }
195 return false;
196 }
197
198 void CompiledMethod::verify_oop_relocations() {
199 // Ensure sure that the code matches the current oop values
200 RelocIterator iter(this, NULL, NULL);
201 while (iter.next()) {
202 if (iter.type() == relocInfo::oop_type) {
203 oop_Relocation* reloc = iter.oop_reloc();
204 if (!reloc->oop_is_immediate()) {
205 reloc->verify_oop_relocation();
206 }
207 }
208 }
209 }
210
211
212 ScopeDesc* CompiledMethod::scope_desc_at(address pc) {
213 PcDesc* pd = pc_desc_at(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 #ifndef SHARK
298 if (method() != NULL && !method()->is_native()) {
299 address pc = fr.pc();
300 SimpleScopeDesc ssd(this, pc);
301 Bytecode_invoke call(ssd.method(), ssd.bci());
302 bool has_receiver = call.has_receiver();
303 bool has_appendix = call.has_appendix();
304 Symbol* signature = call.signature();
305
306 // The method attached by JIT-compilers should be used, if present.
307 // Bytecode can be inaccurate in such case.
308 Method* callee = attached_method_before_pc(pc);
309 if (callee != NULL) {
310 has_receiver = !(callee->access_flags().is_static());
311 has_appendix = false;
312 signature = callee->signature();
313 }
314
315 fr.oops_compiled_arguments_do(signature, has_receiver, has_appendix, reg_map, f);
316 }
317 #endif // !SHARK
318 }
319
320 // -----------------------------------------------------------------------------
321 // CompiledMethod::get_deopt_original_pc
322 //
323 // Return the original PC for the given PC if:
324 // (a) the given PC belongs to a nmethod and
325 // (b) it is a deopt PC
326 address CompiledMethod::get_deopt_original_pc(const frame* fr) {
327 if (fr->cb() == NULL) return NULL;
328
329 CompiledMethod* cm = fr->cb()->as_compiled_method_or_null();
330 if (cm != NULL && cm->is_deopt_pc(fr->pc()))
331 return cm->get_original_pc(fr);
332
333 return NULL;
334 }
335
336 Method* CompiledMethod::attached_method(address call_instr) {
337 assert(code_contains(call_instr), "not part of the nmethod");
338 RelocIterator iter(this, call_instr, call_instr + 1);
339 while (iter.next()) {
340 if (iter.addr() == call_instr) {
341 switch(iter.type()) {
342 case relocInfo::static_call_type: return iter.static_call_reloc()->method_value();
343 case relocInfo::opt_virtual_call_type: return iter.opt_virtual_call_reloc()->method_value();
344 case relocInfo::virtual_call_type: return iter.virtual_call_reloc()->method_value();
345 default: break;
346 }
347 }
348 }
349 return NULL; // not found
350 }
351
352 Method* CompiledMethod::attached_method_before_pc(address pc) {
353 if (NativeCall::is_call_before(pc)) {
354 NativeCall* ncall = nativeCall_before(pc);
355 return attached_method(ncall->instruction_address());
356 }
357 return NULL; // not a call
358 }
359
360 void CompiledMethod::clear_inline_caches() {
361 assert(SafepointSynchronize::is_at_safepoint(), "cleaning of IC's only allowed at safepoint");
362 if (is_zombie()) {
363 return;
364 }
365
366 RelocIterator iter(this);
367 while (iter.next()) {
368 iter.reloc()->clear_inline_cache();
369 }
370 }
371
372 // Clear ICStubs of all compiled ICs
373 void CompiledMethod::clear_ic_stubs() {
374 assert_locked_or_safepoint(CompiledIC_lock);
375 RelocIterator iter(this);
376 while(iter.next()) {
377 if (iter.type() == relocInfo::virtual_call_type) {
378 CompiledIC* ic = CompiledIC_at(&iter);
379 ic->clear_ic_stub();
380 }
381 }
382 }
383
384 #ifdef ASSERT
385
386 class CheckClass : AllStatic {
387 static BoolObjectClosure* _is_alive;
388
389 // Check class_loader is alive for this bit of metadata.
390 static void check_class(Metadata* md) {
391 Klass* klass = NULL;
392 if (md->is_klass()) {
393 klass = ((Klass*)md);
394 } else if (md->is_method()) {
395 klass = ((Method*)md)->method_holder();
396 } else if (md->is_methodData()) {
397 klass = ((MethodData*)md)->method()->method_holder();
398 } else {
399 md->print();
400 ShouldNotReachHere();
401 }
402 assert(klass->is_loader_alive(_is_alive), "must be alive");
403 }
404 public:
405 static void do_check_class(BoolObjectClosure* is_alive, CompiledMethod* nm) {
406 assert(SafepointSynchronize::is_at_safepoint(), "this is only ok at safepoint");
407 _is_alive = is_alive;
408 nm->metadata_do(check_class);
409 }
410 };
411
412 // This is called during a safepoint so can use static data
413 BoolObjectClosure* CheckClass::_is_alive = NULL;
414 #endif // ASSERT
415
416
417 void CompiledMethod::clean_ic_if_metadata_is_dead(CompiledIC *ic, BoolObjectClosure *is_alive) {
418 if (ic->is_icholder_call()) {
419 // The only exception is compiledICHolder oops which may
420 // yet be marked below. (We check this further below).
421 CompiledICHolder* cichk_oop = ic->cached_icholder();
422
423 if (cichk_oop->holder_method()->method_holder()->is_loader_alive(is_alive) &&
424 cichk_oop->holder_klass()->is_loader_alive(is_alive)) {
425 return;
426 }
427 } else {
428 Metadata* ic_oop = ic->cached_metadata();
429 if (ic_oop != NULL) {
430 if (ic_oop->is_klass()) {
431 if (((Klass*)ic_oop)->is_loader_alive(is_alive)) {
432 return;
433 }
434 } else if (ic_oop->is_method()) {
435 if (((Method*)ic_oop)->method_holder()->is_loader_alive(is_alive)) {
436 return;
437 }
438 } else {
439 ShouldNotReachHere();
440 }
441 }
442 }
443
444 ic->set_to_clean();
445 }
446
447 unsigned char CompiledMethod::_global_unloading_clock = 0;
448
449 void CompiledMethod::increase_unloading_clock() {
450 _global_unloading_clock++;
451 if (_global_unloading_clock == 0) {
452 // _nmethods are allocated with _unloading_clock == 0,
453 // so 0 is never used as a clock value.
454 _global_unloading_clock = 1;
455 }
456 }
457
458 void CompiledMethod::set_unloading_clock(unsigned char unloading_clock) {
459 OrderAccess::release_store((volatile jubyte*)&_unloading_clock, unloading_clock);
460 }
461
462 unsigned char CompiledMethod::unloading_clock() {
463 return (unsigned char)OrderAccess::load_acquire((volatile jubyte*)&_unloading_clock);
464 }
465
466 // Processing of oop references should have been sufficient to keep
467 // all strong references alive. Any weak references should have been
468 // cleared as well. Visit all the metadata and ensure that it's
469 // really alive.
470 void CompiledMethod::verify_metadata_loaders(address low_boundary, BoolObjectClosure* is_alive) {
471 #ifdef ASSERT
472 RelocIterator iter(this, low_boundary);
473 while (iter.next()) {
474 // static_stub_Relocations may have dangling references to
475 // Method*s so trim them out here. Otherwise it looks like
476 // compiled code is maintaining a link to dead metadata.
477 address static_call_addr = NULL;
478 if (iter.type() == relocInfo::opt_virtual_call_type) {
479 CompiledIC* cic = CompiledIC_at(&iter);
480 if (!cic->is_call_to_interpreted()) {
481 static_call_addr = iter.addr();
482 }
483 } else if (iter.type() == relocInfo::static_call_type) {
484 CompiledStaticCall* csc = compiledStaticCall_at(iter.reloc());
485 if (!csc->is_call_to_interpreted()) {
486 static_call_addr = iter.addr();
487 }
488 }
489 if (static_call_addr != NULL) {
490 RelocIterator sciter(this, low_boundary);
491 while (sciter.next()) {
492 if (sciter.type() == relocInfo::static_stub_type &&
493 sciter.static_stub_reloc()->static_call() == static_call_addr) {
494 sciter.static_stub_reloc()->clear_inline_cache();
495 }
496 }
497 }
498 }
499 // Check that the metadata embedded in the nmethod is alive
500 CheckClass::do_check_class(is_alive, this);
501 #endif
502 }
503
504 // This is called at the end of the strong tracing/marking phase of a
505 // GC to unload an nmethod if it contains otherwise unreachable
506 // oops.
507
508 void CompiledMethod::do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred) {
509 // Make sure the oop's ready to receive visitors
510 assert(!is_zombie() && !is_unloaded(),
511 "should not call follow on zombie or unloaded nmethod");
512
513 // If the method is not entrant then a JMP is plastered over the
514 // first few bytes. If an oop in the old code was there, that oop
515 // should not get GC'd. Skip the first few bytes of oops on
516 // not-entrant methods.
517 address low_boundary = verified_entry_point();
518 if (is_not_entrant()) {
519 low_boundary += NativeJump::instruction_size;
520 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
521 // (See comment above.)
522 }
523
524 // The RedefineClasses() API can cause the class unloading invariant
525 // to no longer be true. See jvmtiExport.hpp for details.
526 // Also, leave a debugging breadcrumb in local flag.
527 if (JvmtiExport::has_redefined_a_class()) {
528 // This set of the unloading_occurred flag is done before the
529 // call to post_compiled_method_unload() so that the unloading
530 // of this nmethod is reported.
531 unloading_occurred = true;
532 }
533
534 // Exception cache
535 clean_exception_cache(is_alive);
536
537 // If class unloading occurred we first iterate over all inline caches and
538 // clear ICs where the cached oop is referring to an unloaded klass or method.
539 // The remaining live cached oops will be traversed in the relocInfo::oop_type
540 // iteration below.
541 if (unloading_occurred) {
542 RelocIterator iter(this, low_boundary);
543 while(iter.next()) {
544 if (iter.type() == relocInfo::virtual_call_type) {
545 CompiledIC *ic = CompiledIC_at(&iter);
546 clean_ic_if_metadata_is_dead(ic, is_alive);
547 }
548 }
549 }
550
551 if (do_unloading_oops(low_boundary, is_alive, unloading_occurred)) {
552 return;
553 }
554
555 #if INCLUDE_JVMCI
556 if (do_unloading_jvmci(is_alive, unloading_occurred)) {
557 return;
558 }
559 #endif
560
561 // Ensure that all metadata is still alive
562 verify_metadata_loaders(low_boundary, is_alive);
563 }
564
565 template <class CompiledICorStaticCall>
566 static bool clean_if_nmethod_is_unloaded(CompiledICorStaticCall *ic, address addr, BoolObjectClosure *is_alive, CompiledMethod* from) {
567 // Ok, to lookup references to zombies here
568 CodeBlob *cb = CodeCache::find_blob_unsafe(addr);
569 CompiledMethod* nm = (cb != NULL) ? cb->as_compiled_method_or_null() : NULL;
570 if (nm != NULL) {
571 if (nm->unloading_clock() != CompiledMethod::global_unloading_clock()) {
572 // The nmethod has not been processed yet.
573 return true;
574 }
575
576 // Clean inline caches pointing to both zombie and not_entrant methods
577 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
578 ic->set_to_clean();
579 assert(ic->is_clean(), "nmethod " PTR_FORMAT "not clean %s", p2i(from), from->method()->name_and_sig_as_C_string());
580 }
581 }
582
583 return false;
584 }
585
586 static bool clean_if_nmethod_is_unloaded(CompiledIC *ic, BoolObjectClosure *is_alive, CompiledMethod* from) {
587 return clean_if_nmethod_is_unloaded(ic, ic->ic_destination(), is_alive, from);
588 }
589
590 static bool clean_if_nmethod_is_unloaded(CompiledStaticCall *csc, BoolObjectClosure *is_alive, CompiledMethod* from) {
591 return clean_if_nmethod_is_unloaded(csc, csc->destination(), is_alive, from);
592 }
593
594 bool CompiledMethod::do_unloading_parallel(BoolObjectClosure* is_alive, bool unloading_occurred) {
595 ResourceMark rm;
596
597 // Make sure the oop's ready to receive visitors
598 assert(!is_zombie() && !is_unloaded(),
599 "should not call follow on zombie or unloaded nmethod");
600
601 // If the method is not entrant then a JMP is plastered over the
602 // first few bytes. If an oop in the old code was there, that oop
603 // should not get GC'd. Skip the first few bytes of oops on
604 // not-entrant methods.
605 address low_boundary = verified_entry_point();
606 if (is_not_entrant()) {
607 low_boundary += NativeJump::instruction_size;
608 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
609 // (See comment above.)
610 }
611
612 // The RedefineClasses() API can cause the class unloading invariant
613 // to no longer be true. See jvmtiExport.hpp for details.
614 // Also, leave a debugging breadcrumb in local flag.
615 if (JvmtiExport::has_redefined_a_class()) {
616 // This set of the unloading_occurred flag is done before the
617 // call to post_compiled_method_unload() so that the unloading
618 // of this nmethod is reported.
619 unloading_occurred = true;
620 }
621
622 // Exception cache
623 clean_exception_cache(is_alive);
624
625 bool postponed = false;
626
627 RelocIterator iter(this, low_boundary);
628 while(iter.next()) {
629
630 switch (iter.type()) {
631
632 case relocInfo::virtual_call_type:
633 if (unloading_occurred) {
634 // If class unloading occurred we first iterate over all inline caches and
635 // clear ICs where the cached oop is referring to an unloaded klass or method.
636 clean_ic_if_metadata_is_dead(CompiledIC_at(&iter), is_alive);
637 }
638
639 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
640 break;
641
642 case relocInfo::opt_virtual_call_type:
643 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
644 break;
645
646 case relocInfo::static_call_type:
647 postponed |= clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this);
648 break;
649
650 case relocInfo::oop_type:
651 // handled by do_unloading_oops below
652 break;
653
654 case relocInfo::metadata_type:
655 break; // nothing to do.
656
657 default:
658 break;
659 }
660 }
661
662 if (do_unloading_oops(low_boundary, is_alive, unloading_occurred)) {
663 return postponed;
664 }
665
666 #if INCLUDE_JVMCI
667 if (do_unloading_jvmci(is_alive, unloading_occurred)) {
668 return postponed;
669 }
670 #endif
671
672 // Ensure that all metadata is still alive
673 verify_metadata_loaders(low_boundary, is_alive);
674
675 return postponed;
676 }
677
678 void CompiledMethod::do_unloading_parallel_postponed(BoolObjectClosure* is_alive, bool unloading_occurred) {
679 ResourceMark rm;
680
681 // Make sure the oop's ready to receive visitors
682 assert(!is_zombie(),
683 "should not call follow on zombie nmethod");
684
685 // If the method is not entrant then a JMP is plastered over the
686 // first few bytes. If an oop in the old code was there, that oop
687 // should not get GC'd. Skip the first few bytes of oops on
688 // not-entrant methods.
689 address low_boundary = verified_entry_point();
690 if (is_not_entrant()) {
691 low_boundary += NativeJump::instruction_size;
692 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
693 // (See comment above.)
694 }
695
696 RelocIterator iter(this, low_boundary);
697 while(iter.next()) {
698
699 switch (iter.type()) {
700
701 case relocInfo::virtual_call_type:
702 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
703 break;
704
705 case relocInfo::opt_virtual_call_type:
706 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
707 break;
708
709 case relocInfo::static_call_type:
710 clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this);
711 break;
712
713 default:
714 break;
715 }
716 }
717 }