1 /*
2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "code/codeCache.hpp"
27 #include "code/compiledIC.hpp"
28 #include "code/dependencies.hpp"
29 #include "code/nativeInst.hpp"
30 #include "code/nmethod.hpp"
31 #include "code/scopeDesc.hpp"
32 #include "compiler/abstractCompiler.hpp"
33 #include "compiler/compileBroker.hpp"
34 #include "compiler/compileLog.hpp"
35 #include "compiler/compilerDirectives.hpp"
36 #include "compiler/disassembler.hpp"
37 #include "interpreter/bytecode.hpp"
38 #include "oops/methodData.hpp"
39 #include "oops/oop.inline.hpp"
40 #include "prims/jvmtiRedefineClassesTrace.hpp"
41 #include "prims/jvmtiImpl.hpp"
42 #include "runtime/atomic.inline.hpp"
43 #include "runtime/orderAccess.inline.hpp"
44 #include "runtime/os.hpp"
45 #include "runtime/sharedRuntime.hpp"
46 #include "runtime/sweeper.hpp"
47 #include "utilities/resourceHash.hpp"
48 #include "utilities/dtrace.hpp"
49 #include "utilities/events.hpp"
50 #include "utilities/xmlstream.hpp"
51 #ifdef TARGET_ARCH_x86
52 # include "nativeInst_x86.hpp"
53 #endif
54 #ifdef TARGET_ARCH_sparc
55 # include "nativeInst_sparc.hpp"
56 #endif
57 #ifdef TARGET_ARCH_zero
58 # include "nativeInst_zero.hpp"
59 #endif
60 #ifdef TARGET_ARCH_arm
61 # include "nativeInst_arm.hpp"
62 #endif
63 #ifdef TARGET_ARCH_ppc
64 # include "nativeInst_ppc.hpp"
65 #endif
66 #ifdef SHARK
67 #include "shark/sharkCompiler.hpp"
68 #endif
69 #if INCLUDE_JVMCI
70 #include "jvmci/jvmciJavaClasses.hpp"
71 #endif
72
73 unsigned char nmethod::_global_unloading_clock = 0;
74
75 #ifdef DTRACE_ENABLED
76
77 // Only bother with this argument setup if dtrace is available
78
79 #define DTRACE_METHOD_UNLOAD_PROBE(method) \
80 { \
81 Method* m = (method); \
82 if (m != NULL) { \
83 Symbol* klass_name = m->klass_name(); \
84 Symbol* name = m->name(); \
85 Symbol* signature = m->signature(); \
86 HOTSPOT_COMPILED_METHOD_UNLOAD( \
87 (char *) klass_name->bytes(), klass_name->utf8_length(), \
88 (char *) name->bytes(), name->utf8_length(), \
89 (char *) signature->bytes(), signature->utf8_length()); \
90 } \
91 }
92
93 #else // ndef DTRACE_ENABLED
94
95 #define DTRACE_METHOD_UNLOAD_PROBE(method)
96
97 #endif
98
99 bool nmethod::is_compiled_by_c1() const {
100 if (compiler() == NULL) {
101 return false;
102 }
103 return compiler()->is_c1();
104 }
105 bool nmethod::is_compiled_by_jvmci() const {
106 if (compiler() == NULL || method() == NULL) return false; // can happen during debug printing
107 if (is_native_method()) return false;
108 return compiler()->is_jvmci();
109 }
110 bool nmethod::is_compiled_by_c2() const {
111 if (compiler() == NULL) {
112 return false;
113 }
114 return compiler()->is_c2();
115 }
116 bool nmethod::is_compiled_by_shark() const {
117 if (compiler() == NULL) {
118 return false;
119 }
120 return compiler()->is_shark();
121 }
122
123
124
125 //---------------------------------------------------------------------------------
126 // NMethod statistics
127 // They are printed under various flags, including:
128 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation.
129 // (In the latter two cases, they like other stats are printed to the log only.)
130
131 #ifndef PRODUCT
132 // These variables are put into one block to reduce relocations
133 // and make it simpler to print from the debugger.
134 struct java_nmethod_stats_struct {
135 int nmethod_count;
136 int total_size;
137 int relocation_size;
138 int consts_size;
139 int insts_size;
140 int stub_size;
141 int scopes_data_size;
142 int scopes_pcs_size;
143 int dependencies_size;
144 int handler_table_size;
145 int nul_chk_table_size;
146 int oops_size;
147 int metadata_size;
148
149 void note_nmethod(nmethod* nm) {
150 nmethod_count += 1;
151 total_size += nm->size();
152 relocation_size += nm->relocation_size();
153 consts_size += nm->consts_size();
154 insts_size += nm->insts_size();
155 stub_size += nm->stub_size();
156 oops_size += nm->oops_size();
157 metadata_size += nm->metadata_size();
158 scopes_data_size += nm->scopes_data_size();
159 scopes_pcs_size += nm->scopes_pcs_size();
160 dependencies_size += nm->dependencies_size();
161 handler_table_size += nm->handler_table_size();
162 nul_chk_table_size += nm->nul_chk_table_size();
163 }
164 void print_nmethod_stats(const char* name) {
165 if (nmethod_count == 0) return;
166 tty->print_cr("Statistics for %d bytecoded nmethods for %s:", nmethod_count, name);
167 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size);
168 if (nmethod_count != 0) tty->print_cr(" header = " SIZE_FORMAT, nmethod_count * sizeof(nmethod));
169 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size);
170 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size);
171 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size);
172 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size);
173 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size);
174 if (metadata_size != 0) tty->print_cr(" metadata = %d", metadata_size);
175 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size);
176 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size);
177 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size);
178 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size);
179 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size);
180 }
181 };
182
183 struct native_nmethod_stats_struct {
184 int native_nmethod_count;
185 int native_total_size;
186 int native_relocation_size;
187 int native_insts_size;
188 int native_oops_size;
189 int native_metadata_size;
190 void note_native_nmethod(nmethod* nm) {
191 native_nmethod_count += 1;
192 native_total_size += nm->size();
193 native_relocation_size += nm->relocation_size();
194 native_insts_size += nm->insts_size();
195 native_oops_size += nm->oops_size();
196 native_metadata_size += nm->metadata_size();
197 }
198 void print_native_nmethod_stats() {
199 if (native_nmethod_count == 0) return;
200 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count);
201 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size);
202 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size);
203 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size);
204 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size);
205 if (native_metadata_size != 0) tty->print_cr(" N. metadata = %d", native_metadata_size);
206 }
207 };
208
209 struct pc_nmethod_stats_struct {
210 int pc_desc_resets; // number of resets (= number of caches)
211 int pc_desc_queries; // queries to nmethod::find_pc_desc
212 int pc_desc_approx; // number of those which have approximate true
213 int pc_desc_repeats; // number of _pc_descs[0] hits
214 int pc_desc_hits; // number of LRU cache hits
215 int pc_desc_tests; // total number of PcDesc examinations
216 int pc_desc_searches; // total number of quasi-binary search steps
217 int pc_desc_adds; // number of LUR cache insertions
218
219 void print_pc_stats() {
220 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query",
221 pc_desc_queries,
222 (double)(pc_desc_tests + pc_desc_searches)
223 / pc_desc_queries);
224 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d",
225 pc_desc_resets,
226 pc_desc_queries, pc_desc_approx,
227 pc_desc_repeats, pc_desc_hits,
228 pc_desc_tests, pc_desc_searches, pc_desc_adds);
229 }
230 };
231
232 #ifdef COMPILER1
233 static java_nmethod_stats_struct c1_java_nmethod_stats;
234 #endif
235 #ifdef COMPILER2
236 static java_nmethod_stats_struct c2_java_nmethod_stats;
237 #endif
238 #if INCLUDE_JVMCI
239 static java_nmethod_stats_struct jvmci_java_nmethod_stats;
240 #endif
241 #ifdef SHARK
242 static java_nmethod_stats_struct shark_java_nmethod_stats;
243 #endif
244 static java_nmethod_stats_struct unknown_java_nmethod_stats;
245
246 static native_nmethod_stats_struct native_nmethod_stats;
247 static pc_nmethod_stats_struct pc_nmethod_stats;
248
249 static void note_java_nmethod(nmethod* nm) {
250 #ifdef COMPILER1
251 if (nm->is_compiled_by_c1()) {
252 c1_java_nmethod_stats.note_nmethod(nm);
253 } else
254 #endif
255 #ifdef COMPILER2
256 if (nm->is_compiled_by_c2()) {
257 c2_java_nmethod_stats.note_nmethod(nm);
258 } else
259 #endif
260 #if INCLUDE_JVMCI
261 if (nm->is_compiled_by_jvmci()) {
262 jvmci_java_nmethod_stats.note_nmethod(nm);
263 } else
264 #endif
265 #ifdef SHARK
266 if (nm->is_compiled_by_shark()) {
267 shark_java_nmethod_stats.note_nmethod(nm);
268 } else
269 #endif
270 {
271 unknown_java_nmethod_stats.note_nmethod(nm);
272 }
273 }
274 #endif // !PRODUCT
275
276 //---------------------------------------------------------------------------------
277
278
279 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) {
280 assert(pc != NULL, "Must be non null");
281 assert(exception.not_null(), "Must be non null");
282 assert(handler != NULL, "Must be non null");
283
284 _count = 0;
285 _exception_type = exception->klass();
286 _next = NULL;
287
288 add_address_and_handler(pc,handler);
289 }
290
291
292 address ExceptionCache::match(Handle exception, address pc) {
293 assert(pc != NULL,"Must be non null");
294 assert(exception.not_null(),"Must be non null");
295 if (exception->klass() == exception_type()) {
296 return (test_address(pc));
297 }
298
299 return NULL;
300 }
301
302
303 bool ExceptionCache::match_exception_with_space(Handle exception) {
304 assert(exception.not_null(),"Must be non null");
305 if (exception->klass() == exception_type() && count() < cache_size) {
306 return true;
307 }
308 return false;
309 }
310
311
312 address ExceptionCache::test_address(address addr) {
313 for (int i=0; i<count(); i++) {
314 if (pc_at(i) == addr) {
315 return handler_at(i);
316 }
317 }
318 return NULL;
319 }
320
321
322 bool ExceptionCache::add_address_and_handler(address addr, address handler) {
323 if (test_address(addr) == handler) return true;
324 if (count() < cache_size) {
325 set_pc_at(count(),addr);
326 set_handler_at(count(), handler);
327 increment_count();
328 return true;
329 }
330 return false;
331 }
332
333
334 // private method for handling exception cache
335 // These methods are private, and used to manipulate the exception cache
336 // directly.
337 ExceptionCache* nmethod::exception_cache_entry_for_exception(Handle exception) {
338 ExceptionCache* ec = exception_cache();
339 while (ec != NULL) {
340 if (ec->match_exception_with_space(exception)) {
341 return ec;
342 }
343 ec = ec->next();
344 }
345 return NULL;
346 }
347
348
349 //-----------------------------------------------------------------------------
350
351
352 // Helper used by both find_pc_desc methods.
353 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) {
354 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_tests);
355 if (!approximate)
356 return pc->pc_offset() == pc_offset;
357 else
358 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset();
359 }
360
361 void PcDescCache::reset_to(PcDesc* initial_pc_desc) {
362 if (initial_pc_desc == NULL) {
363 _pc_descs[0] = NULL; // native method; no PcDescs at all
364 return;
365 }
366 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_resets);
367 // reset the cache by filling it with benign (non-null) values
368 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel");
369 for (int i = 0; i < cache_size; i++)
370 _pc_descs[i] = initial_pc_desc;
371 }
372
373 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) {
374 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_queries);
375 NOT_PRODUCT(if (approximate) ++pc_nmethod_stats.pc_desc_approx);
376
377 // Note: one might think that caching the most recently
378 // read value separately would be a win, but one would be
379 // wrong. When many threads are updating it, the cache
380 // line it's in would bounce between caches, negating
381 // any benefit.
382
383 // In order to prevent race conditions do not load cache elements
384 // repeatedly, but use a local copy:
385 PcDesc* res;
386
387 // Step one: Check the most recently added value.
388 res = _pc_descs[0];
389 if (res == NULL) return NULL; // native method; no PcDescs at all
390 if (match_desc(res, pc_offset, approximate)) {
391 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_repeats);
392 return res;
393 }
394
395 // Step two: Check the rest of the LRU cache.
396 for (int i = 1; i < cache_size; ++i) {
397 res = _pc_descs[i];
398 if (res->pc_offset() < 0) break; // optimization: skip empty cache
399 if (match_desc(res, pc_offset, approximate)) {
400 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_hits);
401 return res;
402 }
403 }
404
405 // Report failure.
406 return NULL;
407 }
408
409 void PcDescCache::add_pc_desc(PcDesc* pc_desc) {
410 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_adds);
411 // Update the LRU cache by shifting pc_desc forward.
412 for (int i = 0; i < cache_size; i++) {
413 PcDesc* next = _pc_descs[i];
414 _pc_descs[i] = pc_desc;
415 pc_desc = next;
416 }
417 }
418
419 // adjust pcs_size so that it is a multiple of both oopSize and
420 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple
421 // of oopSize, then 2*sizeof(PcDesc) is)
422 static int adjust_pcs_size(int pcs_size) {
423 int nsize = round_to(pcs_size, oopSize);
424 if ((nsize % sizeof(PcDesc)) != 0) {
425 nsize = pcs_size + sizeof(PcDesc);
426 }
427 assert((nsize % oopSize) == 0, "correct alignment");
428 return nsize;
429 }
430
431 //-----------------------------------------------------------------------------
432
433
434 void nmethod::add_exception_cache_entry(ExceptionCache* new_entry) {
435 assert(ExceptionCache_lock->owned_by_self(),"Must hold the ExceptionCache_lock");
436 assert(new_entry != NULL,"Must be non null");
437 assert(new_entry->next() == NULL, "Must be null");
438
439 if (exception_cache() != NULL) {
440 new_entry->set_next(exception_cache());
441 }
442 set_exception_cache(new_entry);
443 }
444
445 void nmethod::clean_exception_cache(BoolObjectClosure* is_alive) {
446 ExceptionCache* prev = NULL;
447 ExceptionCache* curr = exception_cache();
448
449 while (curr != NULL) {
450 ExceptionCache* next = curr->next();
451
452 Klass* ex_klass = curr->exception_type();
453 if (ex_klass != NULL && !ex_klass->is_loader_alive(is_alive)) {
454 if (prev == NULL) {
455 set_exception_cache(next);
456 } else {
457 prev->set_next(next);
458 }
459 delete curr;
460 // prev stays the same.
461 } else {
462 prev = curr;
463 }
464
465 curr = next;
466 }
467 }
468
469 // public method for accessing the exception cache
470 // These are the public access methods.
471 address nmethod::handler_for_exception_and_pc(Handle exception, address pc) {
472 // We never grab a lock to read the exception cache, so we may
473 // have false negatives. This is okay, as it can only happen during
474 // the first few exception lookups for a given nmethod.
475 ExceptionCache* ec = exception_cache();
476 while (ec != NULL) {
477 address ret_val;
478 if ((ret_val = ec->match(exception,pc)) != NULL) {
479 return ret_val;
480 }
481 ec = ec->next();
482 }
483 return NULL;
484 }
485
486
487 void nmethod::add_handler_for_exception_and_pc(Handle exception, address pc, address handler) {
488 // There are potential race conditions during exception cache updates, so we
489 // must own the ExceptionCache_lock before doing ANY modifications. Because
490 // we don't lock during reads, it is possible to have several threads attempt
491 // to update the cache with the same data. We need to check for already inserted
492 // copies of the current data before adding it.
493
494 MutexLocker ml(ExceptionCache_lock);
495 ExceptionCache* target_entry = exception_cache_entry_for_exception(exception);
496
497 if (target_entry == NULL || !target_entry->add_address_and_handler(pc,handler)) {
498 target_entry = new ExceptionCache(exception,pc,handler);
499 add_exception_cache_entry(target_entry);
500 }
501 }
502
503
504 //-------------end of code for ExceptionCache--------------
505
506
507 int nmethod::total_size() const {
508 return
509 consts_size() +
510 insts_size() +
511 stub_size() +
512 scopes_data_size() +
513 scopes_pcs_size() +
514 handler_table_size() +
515 nul_chk_table_size();
516 }
517
518 const char* nmethod::compile_kind() const {
519 if (is_osr_method()) return "osr";
520 if (method() != NULL && is_native_method()) return "c2n";
521 return NULL;
522 }
523
524 // Fill in default values for various flag fields
525 void nmethod::init_defaults() {
526 _state = in_use;
527 _unloading_clock = 0;
528 _marked_for_reclamation = 0;
529 _has_flushed_dependencies = 0;
530 _has_unsafe_access = 0;
531 _has_method_handle_invokes = 0;
532 _lazy_critical_native = 0;
533 _has_wide_vectors = 0;
534 _marked_for_deoptimization = 0;
535 _lock_count = 0;
536 _stack_traversal_mark = 0;
537 _unload_reported = false; // jvmti state
538
539 #ifdef ASSERT
540 _oops_are_stale = false;
541 #endif
542
543 _oops_do_mark_link = NULL;
544 _jmethod_id = NULL;
545 _osr_link = NULL;
546 if (UseG1GC) {
547 _unloading_next = NULL;
548 } else {
549 _scavenge_root_link = NULL;
550 }
551 _scavenge_root_state = 0;
552 _compiler = NULL;
553 #if INCLUDE_RTM_OPT
554 _rtm_state = NoRTM;
555 #endif
556 #if INCLUDE_JVMCI
557 _jvmci_installed_code = NULL;
558 _speculation_log = NULL;
559 #endif
560 }
561
562 nmethod* nmethod::new_native_nmethod(const methodHandle& method,
563 int compile_id,
564 CodeBuffer *code_buffer,
565 int vep_offset,
566 int frame_complete,
567 int frame_size,
568 ByteSize basic_lock_owner_sp_offset,
569 ByteSize basic_lock_sp_offset,
570 OopMapSet* oop_maps) {
571 code_buffer->finalize_oop_references(method);
572 // create nmethod
573 nmethod* nm = NULL;
574 {
575 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
576 int native_nmethod_size = allocation_size(code_buffer, sizeof(nmethod));
577 CodeOffsets offsets;
578 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
579 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
580 nm = new (native_nmethod_size, CompLevel_none) nmethod(method(), native_nmethod_size,
581 compile_id, &offsets,
582 code_buffer, frame_size,
583 basic_lock_owner_sp_offset,
584 basic_lock_sp_offset, oop_maps);
585 NOT_PRODUCT(if (nm != NULL) native_nmethod_stats.note_native_nmethod(nm));
586 }
587 // verify nmethod
588 debug_only(if (nm) nm->verify();) // might block
589
590 if (nm != NULL) {
591 nm->log_new_nmethod();
592 }
593
594 return nm;
595 }
596
597 nmethod* nmethod::new_nmethod(const methodHandle& method,
598 int compile_id,
599 int entry_bci,
600 CodeOffsets* offsets,
601 int orig_pc_offset,
602 DebugInformationRecorder* debug_info,
603 Dependencies* dependencies,
604 CodeBuffer* code_buffer, int frame_size,
605 OopMapSet* oop_maps,
606 ExceptionHandlerTable* handler_table,
607 ImplicitExceptionTable* nul_chk_table,
608 AbstractCompiler* compiler,
609 int comp_level
610 #if INCLUDE_JVMCI
611 , Handle installed_code,
612 Handle speculationLog
613 #endif
614 )
615 {
616 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
617 code_buffer->finalize_oop_references(method);
618 // create nmethod
619 nmethod* nm = NULL;
620 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
621 int nmethod_size =
622 allocation_size(code_buffer, sizeof(nmethod))
623 + adjust_pcs_size(debug_info->pcs_size())
624 + round_to(dependencies->size_in_bytes() , oopSize)
625 + round_to(handler_table->size_in_bytes(), oopSize)
626 + round_to(nul_chk_table->size_in_bytes(), oopSize)
627 + round_to(debug_info->data_size() , oopSize);
628
629 nm = new (nmethod_size, comp_level)
630 nmethod(method(), nmethod_size, compile_id, entry_bci, offsets,
631 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size,
632 oop_maps,
633 handler_table,
634 nul_chk_table,
635 compiler,
636 comp_level
637 #if INCLUDE_JVMCI
638 , installed_code,
639 speculationLog
640 #endif
641 );
642
643 if (nm != NULL) {
644 // To make dependency checking during class loading fast, record
645 // the nmethod dependencies in the classes it is dependent on.
646 // This allows the dependency checking code to simply walk the
647 // class hierarchy above the loaded class, checking only nmethods
648 // which are dependent on those classes. The slow way is to
649 // check every nmethod for dependencies which makes it linear in
650 // the number of methods compiled. For applications with a lot
651 // classes the slow way is too slow.
652 for (Dependencies::DepStream deps(nm); deps.next(); ) {
653 if (deps.type() == Dependencies::call_site_target_value) {
654 // CallSite dependencies are managed on per-CallSite instance basis.
655 oop call_site = deps.argument_oop(0);
656 MethodHandles::add_dependent_nmethod(call_site, nm);
657 } else {
658 Klass* klass = deps.context_type();
659 if (klass == NULL) {
660 continue; // ignore things like evol_method
661 }
662 // record this nmethod as dependent on this klass
663 InstanceKlass::cast(klass)->add_dependent_nmethod(nm);
664 }
665 }
666 NOT_PRODUCT(if (nm != NULL) note_java_nmethod(nm));
667 }
668 }
669 // Do verification and logging outside CodeCache_lock.
670 if (nm != NULL) {
671 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
672 DEBUG_ONLY(nm->verify();)
673 nm->log_new_nmethod();
674 }
675 return nm;
676 }
677
678 // For native wrappers
679 nmethod::nmethod(
680 Method* method,
681 int nmethod_size,
682 int compile_id,
683 CodeOffsets* offsets,
684 CodeBuffer* code_buffer,
685 int frame_size,
686 ByteSize basic_lock_owner_sp_offset,
687 ByteSize basic_lock_sp_offset,
688 OopMapSet* oop_maps )
689 : CodeBlob("native nmethod", code_buffer, sizeof(nmethod),
690 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps),
691 _native_receiver_sp_offset(basic_lock_owner_sp_offset),
692 _native_basic_lock_sp_offset(basic_lock_sp_offset)
693 {
694 {
695 debug_only(No_Safepoint_Verifier nsv;)
696 assert_locked_or_safepoint(CodeCache_lock);
697
698 init_defaults();
699 _method = method;
700 _entry_bci = InvocationEntryBci;
701 // We have no exception handler or deopt handler make the
702 // values something that will never match a pc like the nmethod vtable entry
703 _exception_offset = 0;
704 _deoptimize_offset = 0;
705 _deoptimize_mh_offset = 0;
706 _orig_pc_offset = 0;
707
708 _consts_offset = data_offset();
709 _stub_offset = data_offset();
710 _oops_offset = data_offset();
711 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize);
712 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize);
713 _scopes_pcs_offset = _scopes_data_offset;
714 _dependencies_offset = _scopes_pcs_offset;
715 _handler_table_offset = _dependencies_offset;
716 _nul_chk_table_offset = _handler_table_offset;
717 _nmethod_end_offset = _nul_chk_table_offset;
718 _compile_id = compile_id;
719 _comp_level = CompLevel_none;
720 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
721 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
722 _osr_entry_point = NULL;
723 _exception_cache = NULL;
724 _pc_desc_cache.reset_to(NULL);
725 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
726
727 code_buffer->copy_values_to(this);
728 if (ScavengeRootsInCode) {
729 if (detect_scavenge_root_oops()) {
730 CodeCache::add_scavenge_root_nmethod(this);
731 }
732 Universe::heap()->register_nmethod(this);
733 }
734 debug_only(verify_scavenge_root_oops());
735 CodeCache::commit(this);
736 }
737
738 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
739 ttyLocker ttyl; // keep the following output all in one block
740 // This output goes directly to the tty, not the compiler log.
741 // To enable tools to match it up with the compilation activity,
742 // be sure to tag this tty output with the compile ID.
743 if (xtty != NULL) {
744 xtty->begin_head("print_native_nmethod");
745 xtty->method(_method);
746 xtty->stamp();
747 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
748 }
749 // print the header part first
750 print();
751 // then print the requested information
752 if (PrintNativeNMethods) {
753 print_code();
754 if (oop_maps != NULL) {
755 oop_maps->print();
756 }
757 }
758 if (PrintRelocations) {
759 print_relocations();
760 }
761 if (xtty != NULL) {
762 xtty->tail("print_native_nmethod");
763 }
764 }
765 }
766
767 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () {
768 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level));
769 }
770
771 nmethod::nmethod(
772 Method* method,
773 int nmethod_size,
774 int compile_id,
775 int entry_bci,
776 CodeOffsets* offsets,
777 int orig_pc_offset,
778 DebugInformationRecorder* debug_info,
779 Dependencies* dependencies,
780 CodeBuffer *code_buffer,
781 int frame_size,
782 OopMapSet* oop_maps,
783 ExceptionHandlerTable* handler_table,
784 ImplicitExceptionTable* nul_chk_table,
785 AbstractCompiler* compiler,
786 int comp_level
787 #if INCLUDE_JVMCI
788 , Handle installed_code,
789 Handle speculation_log
790 #endif
791 )
792 : CodeBlob("nmethod", code_buffer, sizeof(nmethod),
793 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps),
794 _native_receiver_sp_offset(in_ByteSize(-1)),
795 _native_basic_lock_sp_offset(in_ByteSize(-1))
796 {
797 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
798 {
799 debug_only(No_Safepoint_Verifier nsv;)
800 assert_locked_or_safepoint(CodeCache_lock);
801
802 init_defaults();
803 _method = method;
804 _entry_bci = entry_bci;
805 _compile_id = compile_id;
806 _comp_level = comp_level;
807 _compiler = compiler;
808 _orig_pc_offset = orig_pc_offset;
809 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
810
811 // Section offsets
812 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts());
813 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs());
814
815 #if INCLUDE_JVMCI
816 _jvmci_installed_code = installed_code();
817 _speculation_log = (instanceOop)speculation_log();
818
819 if (compiler->is_jvmci()) {
820 // JVMCI might not produce any stub sections
821 if (offsets->value(CodeOffsets::Exceptions) != -1) {
822 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions);
823 } else {
824 _exception_offset = -1;
825 }
826 if (offsets->value(CodeOffsets::Deopt) != -1) {
827 _deoptimize_offset = code_offset() + offsets->value(CodeOffsets::Deopt);
828 } else {
829 _deoptimize_offset = -1;
830 }
831 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
832 _deoptimize_mh_offset = code_offset() + offsets->value(CodeOffsets::DeoptMH);
833 } else {
834 _deoptimize_mh_offset = -1;
835 }
836 } else {
837 #endif
838 // Exception handler and deopt handler are in the stub section
839 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set");
840 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set");
841
842 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
843 _deoptimize_offset = _stub_offset + offsets->value(CodeOffsets::Deopt);
844 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
845 _deoptimize_mh_offset = _stub_offset + offsets->value(CodeOffsets::DeoptMH);
846 } else {
847 _deoptimize_mh_offset = -1;
848 #if INCLUDE_JVMCI
849 }
850 #endif
851 }
852 if (offsets->value(CodeOffsets::UnwindHandler) != -1) {
853 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler);
854 } else {
855 _unwind_handler_offset = -1;
856 }
857
858 _oops_offset = data_offset();
859 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize);
860 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize);
861
862 _scopes_pcs_offset = _scopes_data_offset + round_to(debug_info->data_size (), oopSize);
863 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
864 _handler_table_offset = _dependencies_offset + round_to(dependencies->size_in_bytes (), oopSize);
865 _nul_chk_table_offset = _handler_table_offset + round_to(handler_table->size_in_bytes(), oopSize);
866 _nmethod_end_offset = _nul_chk_table_offset + round_to(nul_chk_table->size_in_bytes(), oopSize);
867
868 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
869 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
870 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry);
871 _exception_cache = NULL;
872 _pc_desc_cache.reset_to(scopes_pcs_begin());
873
874 // Copy contents of ScopeDescRecorder to nmethod
875 code_buffer->copy_values_to(this);
876 debug_info->copy_to(this);
877 dependencies->copy_to(this);
878 if (ScavengeRootsInCode) {
879 if (detect_scavenge_root_oops()) {
880 CodeCache::add_scavenge_root_nmethod(this);
881 }
882 Universe::heap()->register_nmethod(this);
883 }
884 debug_only(verify_scavenge_root_oops());
885
886 CodeCache::commit(this);
887
888 // Copy contents of ExceptionHandlerTable to nmethod
889 handler_table->copy_to(this);
890 nul_chk_table->copy_to(this);
891
892 // we use the information of entry points to find out if a method is
893 // static or non static
894 assert(compiler->is_c2() || compiler->is_jvmci() ||
895 _method->is_static() == (entry_point() == _verified_entry_point),
896 " entry points must be same for static methods and vice versa");
897 }
898 }
899
900 // Print a short set of xml attributes to identify this nmethod. The
901 // output should be embedded in some other element.
902 void nmethod::log_identity(xmlStream* log) const {
903 log->print(" compile_id='%d'", compile_id());
904 const char* nm_kind = compile_kind();
905 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind);
906 if (compiler() != NULL) {
907 log->print(" compiler='%s'", compiler()->name());
908 }
909 if (TieredCompilation) {
910 log->print(" level='%d'", comp_level());
911 }
912 }
913
914
915 #define LOG_OFFSET(log, name) \
916 if (p2i(name##_end()) - p2i(name##_begin())) \
917 log->print(" " XSTR(name) "_offset='" INTX_FORMAT "'" , \
918 p2i(name##_begin()) - p2i(this))
919
920
921 void nmethod::log_new_nmethod() const {
922 if (LogCompilation && xtty != NULL) {
923 ttyLocker ttyl;
924 HandleMark hm;
925 xtty->begin_elem("nmethod");
926 log_identity(xtty);
927 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size());
928 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this));
929
930 LOG_OFFSET(xtty, relocation);
931 LOG_OFFSET(xtty, consts);
932 LOG_OFFSET(xtty, insts);
933 LOG_OFFSET(xtty, stub);
934 LOG_OFFSET(xtty, scopes_data);
935 LOG_OFFSET(xtty, scopes_pcs);
936 LOG_OFFSET(xtty, dependencies);
937 LOG_OFFSET(xtty, handler_table);
938 LOG_OFFSET(xtty, nul_chk_table);
939 LOG_OFFSET(xtty, oops);
940 LOG_OFFSET(xtty, metadata);
941
942 xtty->method(method());
943 xtty->stamp();
944 xtty->end_elem();
945 }
946 }
947
948 #undef LOG_OFFSET
949
950
951 // Print out more verbose output usually for a newly created nmethod.
952 void nmethod::print_on(outputStream* st, const char* msg) const {
953 if (st != NULL) {
954 ttyLocker ttyl;
955 if (WizardMode) {
956 CompileTask::print(st, this, msg, /*short_form:*/ true);
957 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this));
958 } else {
959 CompileTask::print(st, this, msg, /*short_form:*/ false);
960 }
961 }
962 }
963
964
965 void nmethod::print_nmethod(bool printmethod) {
966 ttyLocker ttyl; // keep the following output all in one block
967 if (xtty != NULL) {
968 xtty->begin_head("print_nmethod");
969 xtty->stamp();
970 xtty->end_head();
971 }
972 // print the header part first
973 print();
974 // then print the requested information
975 if (printmethod) {
976 print_code();
977 print_pcs();
978 if (oop_maps()) {
979 oop_maps()->print();
980 }
981 }
982 if (PrintDebugInfo || CompilerOracle::has_option_string(_method, "PrintDebugInfo")) {
983 print_scopes();
984 }
985 if (PrintRelocations || CompilerOracle::has_option_string(_method, "PrintRelocations")) {
986 print_relocations();
987 }
988 if (PrintDependencies || CompilerOracle::has_option_string(_method, "PrintDependencies")) {
989 print_dependencies();
990 }
991 if (PrintExceptionHandlers) {
992 print_handler_table();
993 print_nul_chk_table();
994 }
995 if (xtty != NULL) {
996 xtty->tail("print_nmethod");
997 }
998 }
999
1000
1001 // Promote one word from an assembly-time handle to a live embedded oop.
1002 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
1003 if (handle == NULL ||
1004 // As a special case, IC oops are initialized to 1 or -1.
1005 handle == (jobject) Universe::non_oop_word()) {
1006 (*dest) = (oop) handle;
1007 } else {
1008 (*dest) = JNIHandles::resolve_non_null(handle);
1009 }
1010 }
1011
1012
1013 // Have to have the same name because it's called by a template
1014 void nmethod::copy_values(GrowableArray<jobject>* array) {
1015 int length = array->length();
1016 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
1017 oop* dest = oops_begin();
1018 for (int index = 0 ; index < length; index++) {
1019 initialize_immediate_oop(&dest[index], array->at(index));
1020 }
1021
1022 // Now we can fix up all the oops in the code. We need to do this
1023 // in the code because the assembler uses jobjects as placeholders.
1024 // The code and relocations have already been initialized by the
1025 // CodeBlob constructor, so it is valid even at this early point to
1026 // iterate over relocations and patch the code.
1027 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true);
1028 }
1029
1030 void nmethod::copy_values(GrowableArray<Metadata*>* array) {
1031 int length = array->length();
1032 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough");
1033 Metadata** dest = metadata_begin();
1034 for (int index = 0 ; index < length; index++) {
1035 dest[index] = array->at(index);
1036 }
1037 }
1038
1039 bool nmethod::is_at_poll_return(address pc) {
1040 RelocIterator iter(this, pc, pc+1);
1041 while (iter.next()) {
1042 if (iter.type() == relocInfo::poll_return_type)
1043 return true;
1044 }
1045 return false;
1046 }
1047
1048
1049 bool nmethod::is_at_poll_or_poll_return(address pc) {
1050 RelocIterator iter(this, pc, pc+1);
1051 while (iter.next()) {
1052 relocInfo::relocType t = iter.type();
1053 if (t == relocInfo::poll_return_type || t == relocInfo::poll_type)
1054 return true;
1055 }
1056 return false;
1057 }
1058
1059
1060 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) {
1061 // re-patch all oop-bearing instructions, just in case some oops moved
1062 RelocIterator iter(this, begin, end);
1063 while (iter.next()) {
1064 if (iter.type() == relocInfo::oop_type) {
1065 oop_Relocation* reloc = iter.oop_reloc();
1066 if (initialize_immediates && reloc->oop_is_immediate()) {
1067 oop* dest = reloc->oop_addr();
1068 initialize_immediate_oop(dest, (jobject) *dest);
1069 }
1070 // Refresh the oop-related bits of this instruction.
1071 reloc->fix_oop_relocation();
1072 } else if (iter.type() == relocInfo::metadata_type) {
1073 metadata_Relocation* reloc = iter.metadata_reloc();
1074 reloc->fix_metadata_relocation();
1075 }
1076 }
1077 }
1078
1079
1080 void nmethod::verify_oop_relocations() {
1081 // Ensure sure that the code matches the current oop values
1082 RelocIterator iter(this, NULL, NULL);
1083 while (iter.next()) {
1084 if (iter.type() == relocInfo::oop_type) {
1085 oop_Relocation* reloc = iter.oop_reloc();
1086 if (!reloc->oop_is_immediate()) {
1087 reloc->verify_oop_relocation();
1088 }
1089 }
1090 }
1091 }
1092
1093
1094 ScopeDesc* nmethod::scope_desc_at(address pc) {
1095 PcDesc* pd = pc_desc_at(pc);
1096 guarantee(pd != NULL, "scope must be present");
1097 return new ScopeDesc(this, pd->scope_decode_offset(),
1098 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(),
1099 pd->return_oop());
1100 }
1101
1102
1103 void nmethod::clear_inline_caches() {
1104 assert(SafepointSynchronize::is_at_safepoint(), "cleaning of IC's only allowed at safepoint");
1105 if (is_zombie()) {
1106 return;
1107 }
1108
1109 RelocIterator iter(this);
1110 while (iter.next()) {
1111 iter.reloc()->clear_inline_cache();
1112 }
1113 }
1114
1115 // Clear ICStubs of all compiled ICs
1116 void nmethod::clear_ic_stubs() {
1117 assert_locked_or_safepoint(CompiledIC_lock);
1118 RelocIterator iter(this);
1119 while(iter.next()) {
1120 if (iter.type() == relocInfo::virtual_call_type) {
1121 CompiledIC* ic = CompiledIC_at(&iter);
1122 ic->clear_ic_stub();
1123 }
1124 }
1125 }
1126
1127
1128 void nmethod::cleanup_inline_caches() {
1129 assert_locked_or_safepoint(CompiledIC_lock);
1130
1131 // If the method is not entrant or zombie then a JMP is plastered over the
1132 // first few bytes. If an oop in the old code was there, that oop
1133 // should not get GC'd. Skip the first few bytes of oops on
1134 // not-entrant methods.
1135 address low_boundary = verified_entry_point();
1136 if (!is_in_use()) {
1137 low_boundary += NativeJump::instruction_size;
1138 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1139 // This means that the low_boundary is going to be a little too high.
1140 // This shouldn't matter, since oops of non-entrant methods are never used.
1141 // In fact, why are we bothering to look at oops in a non-entrant method??
1142 }
1143
1144 // Find all calls in an nmethod and clear the ones that point to non-entrant,
1145 // zombie and unloaded nmethods.
1146 ResourceMark rm;
1147 RelocIterator iter(this, low_boundary);
1148 while(iter.next()) {
1149 switch(iter.type()) {
1150 case relocInfo::virtual_call_type:
1151 case relocInfo::opt_virtual_call_type: {
1152 CompiledIC *ic = CompiledIC_at(&iter);
1153 // Ok, to lookup references to zombies here
1154 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
1155 if( cb != NULL && cb->is_nmethod() ) {
1156 nmethod* nm = (nmethod*)cb;
1157 // Clean inline caches pointing to zombie, non-entrant and unloaded methods
1158 if (!nm->is_in_use() || (nm->method()->code() != nm)) ic->set_to_clean(is_alive());
1159 }
1160 break;
1161 }
1162 case relocInfo::static_call_type: {
1163 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
1164 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
1165 if( cb != NULL && cb->is_nmethod() ) {
1166 nmethod* nm = (nmethod*)cb;
1167 // Clean inline caches pointing to zombie, non-entrant and unloaded methods
1168 if (!nm->is_in_use() || (nm->method()->code() != nm)) csc->set_to_clean();
1169 }
1170 break;
1171 }
1172 }
1173 }
1174 }
1175
1176 void nmethod::verify_clean_inline_caches() {
1177 assert_locked_or_safepoint(CompiledIC_lock);
1178
1179 // If the method is not entrant or zombie then a JMP is plastered over the
1180 // first few bytes. If an oop in the old code was there, that oop
1181 // should not get GC'd. Skip the first few bytes of oops on
1182 // not-entrant methods.
1183 address low_boundary = verified_entry_point();
1184 if (!is_in_use()) {
1185 low_boundary += NativeJump::instruction_size;
1186 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1187 // This means that the low_boundary is going to be a little too high.
1188 // This shouldn't matter, since oops of non-entrant methods are never used.
1189 // In fact, why are we bothering to look at oops in a non-entrant method??
1190 }
1191
1192 ResourceMark rm;
1193 RelocIterator iter(this, low_boundary);
1194 while(iter.next()) {
1195 switch(iter.type()) {
1196 case relocInfo::virtual_call_type:
1197 case relocInfo::opt_virtual_call_type: {
1198 CompiledIC *ic = CompiledIC_at(&iter);
1199 // Ok, to lookup references to zombies here
1200 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
1201 if( cb != NULL && cb->is_nmethod() ) {
1202 nmethod* nm = (nmethod*)cb;
1203 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
1204 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1205 assert(ic->is_clean(), "IC should be clean");
1206 }
1207 }
1208 break;
1209 }
1210 case relocInfo::static_call_type: {
1211 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
1212 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
1213 if( cb != NULL && cb->is_nmethod() ) {
1214 nmethod* nm = (nmethod*)cb;
1215 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
1216 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1217 assert(csc->is_clean(), "IC should be clean");
1218 }
1219 }
1220 break;
1221 }
1222 }
1223 }
1224 }
1225
1226 int nmethod::verify_icholder_relocations() {
1227 int count = 0;
1228
1229 RelocIterator iter(this);
1230 while(iter.next()) {
1231 if (iter.type() == relocInfo::virtual_call_type) {
1232 if (CompiledIC::is_icholder_call_site(iter.virtual_call_reloc())) {
1233 CompiledIC *ic = CompiledIC_at(&iter);
1234 if (TraceCompiledIC) {
1235 tty->print("noticed icholder " INTPTR_FORMAT " ", p2i(ic->cached_icholder()));
1236 ic->print();
1237 }
1238 assert(ic->cached_icholder() != NULL, "must be non-NULL");
1239 count++;
1240 }
1241 }
1242 }
1243
1244 return count;
1245 }
1246
1247 // This is a private interface with the sweeper.
1248 void nmethod::mark_as_seen_on_stack() {
1249 assert(is_alive(), "Must be an alive method");
1250 // Set the traversal mark to ensure that the sweeper does 2
1251 // cleaning passes before moving to zombie.
1252 set_stack_traversal_mark(NMethodSweeper::traversal_count());
1253 }
1254
1255 // Tell if a non-entrant method can be converted to a zombie (i.e.,
1256 // there are no activations on the stack, not in use by the VM,
1257 // and not in use by the ServiceThread)
1258 bool nmethod::can_convert_to_zombie() {
1259 assert(is_not_entrant(), "must be a non-entrant method");
1260
1261 // Since the nmethod sweeper only does partial sweep the sweeper's traversal
1262 // count can be greater than the stack traversal count before it hits the
1263 // nmethod for the second time.
1264 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count() &&
1265 !is_locked_by_vm();
1266 }
1267
1268 void nmethod::inc_decompile_count() {
1269 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return;
1270 // Could be gated by ProfileTraps, but do not bother...
1271 Method* m = method();
1272 if (m == NULL) return;
1273 MethodData* mdo = m->method_data();
1274 if (mdo == NULL) return;
1275 // There is a benign race here. See comments in methodData.hpp.
1276 mdo->inc_decompile_count();
1277 }
1278
1279 void nmethod::increase_unloading_clock() {
1280 _global_unloading_clock++;
1281 if (_global_unloading_clock == 0) {
1282 // _nmethods are allocated with _unloading_clock == 0,
1283 // so 0 is never used as a clock value.
1284 _global_unloading_clock = 1;
1285 }
1286 }
1287
1288 void nmethod::set_unloading_clock(unsigned char unloading_clock) {
1289 OrderAccess::release_store((volatile jubyte*)&_unloading_clock, unloading_clock);
1290 }
1291
1292 unsigned char nmethod::unloading_clock() {
1293 return (unsigned char)OrderAccess::load_acquire((volatile jubyte*)&_unloading_clock);
1294 }
1295
1296 void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) {
1297
1298 post_compiled_method_unload();
1299
1300 // Since this nmethod is being unloaded, make sure that dependencies
1301 // recorded in instanceKlasses get flushed and pass non-NULL closure to
1302 // indicate that this work is being done during a GC.
1303 assert(Universe::heap()->is_gc_active(), "should only be called during gc");
1304 assert(is_alive != NULL, "Should be non-NULL");
1305 // A non-NULL is_alive closure indicates that this is being called during GC.
1306 flush_dependencies(is_alive);
1307
1308 // Break cycle between nmethod & method
1309 if (TraceClassUnloading && WizardMode) {
1310 tty->print_cr("[Class unloading: Making nmethod " INTPTR_FORMAT
1311 " unloadable], Method*(" INTPTR_FORMAT
1312 "), cause(" INTPTR_FORMAT ")",
1313 p2i(this), p2i(_method), p2i(cause));
1314 if (!Universe::heap()->is_gc_active())
1315 cause->klass()->print();
1316 }
1317 // Unlink the osr method, so we do not look this up again
1318 if (is_osr_method()) {
1319 invalidate_osr_method();
1320 }
1321 // If _method is already NULL the Method* is about to be unloaded,
1322 // so we don't have to break the cycle. Note that it is possible to
1323 // have the Method* live here, in case we unload the nmethod because
1324 // it is pointing to some oop (other than the Method*) being unloaded.
1325 if (_method != NULL) {
1326 // OSR methods point to the Method*, but the Method* does not
1327 // point back!
1328 if (_method->code() == this) {
1329 _method->clear_code(); // Break a cycle
1330 }
1331 _method = NULL; // Clear the method of this dead nmethod
1332 }
1333
1334 // Make the class unloaded - i.e., change state and notify sweeper
1335 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
1336 if (is_in_use()) {
1337 // Transitioning directly from live to unloaded -- so
1338 // we need to force a cache clean-up; remember this
1339 // for later on.
1340 CodeCache::set_needs_cache_clean(true);
1341 }
1342
1343 // Unregister must be done before the state change
1344 Universe::heap()->unregister_nmethod(this);
1345
1346 _state = unloaded;
1347
1348 #if INCLUDE_JVMCI
1349 // The method can only be unloaded after the pointer to the installed code
1350 // Java wrapper is no longer alive. Here we need to clear out this weak
1351 // reference to the dead object. Nulling out the reference has to happen
1352 // after the method is unregistered since the original value may be still
1353 // tracked by the rset.
1354 maybe_invalidate_installed_code();
1355 #endif
1356
1357 // Log the unloading.
1358 log_state_change();
1359
1360 // The Method* is gone at this point
1361 assert(_method == NULL, "Tautology");
1362
1363 set_osr_link(NULL);
1364 //set_scavenge_root_link(NULL); // done by prune_scavenge_root_nmethods
1365 NMethodSweeper::report_state_change(this);
1366 }
1367
1368 void nmethod::invalidate_osr_method() {
1369 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
1370 // Remove from list of active nmethods
1371 if (method() != NULL)
1372 method()->method_holder()->remove_osr_nmethod(this);
1373 }
1374
1375 void nmethod::log_state_change() const {
1376 if (LogCompilation) {
1377 if (xtty != NULL) {
1378 ttyLocker ttyl; // keep the following output all in one block
1379 if (_state == unloaded) {
1380 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'",
1381 os::current_thread_id());
1382 } else {
1383 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s",
1384 os::current_thread_id(),
1385 (_state == zombie ? " zombie='1'" : ""));
1386 }
1387 log_identity(xtty);
1388 xtty->stamp();
1389 xtty->end_elem();
1390 }
1391 }
1392 if (PrintCompilation && _state != unloaded) {
1393 print_on(tty, _state == zombie ? "made zombie" : "made not entrant");
1394 }
1395 }
1396
1397 /**
1398 * Common functionality for both make_not_entrant and make_zombie
1399 */
1400 bool nmethod::make_not_entrant_or_zombie(unsigned int state) {
1401 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant");
1402 assert(!is_zombie(), "should not already be a zombie");
1403
1404 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below.
1405 nmethodLocker nml(this);
1406 methodHandle the_method(method());
1407 No_Safepoint_Verifier nsv;
1408
1409 // during patching, depending on the nmethod state we must notify the GC that
1410 // code has been unloaded, unregistering it. We cannot do this right while
1411 // holding the Patching_lock because we need to use the CodeCache_lock. This
1412 // would be prone to deadlocks.
1413 // This flag is used to remember whether we need to later lock and unregister.
1414 bool nmethod_needs_unregister = false;
1415
1416 {
1417 // invalidate osr nmethod before acquiring the patching lock since
1418 // they both acquire leaf locks and we don't want a deadlock.
1419 // This logic is equivalent to the logic below for patching the
1420 // verified entry point of regular methods.
1421 if (is_osr_method()) {
1422 // this effectively makes the osr nmethod not entrant
1423 invalidate_osr_method();
1424 }
1425
1426 // Enter critical section. Does not block for safepoint.
1427 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1428
1429 if (_state == state) {
1430 // another thread already performed this transition so nothing
1431 // to do, but return false to indicate this.
1432 return false;
1433 }
1434
1435 // The caller can be calling the method statically or through an inline
1436 // cache call.
1437 if (!is_osr_method() && !is_not_entrant()) {
1438 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
1439 SharedRuntime::get_handle_wrong_method_stub());
1440 }
1441
1442 if (is_in_use()) {
1443 // It's a true state change, so mark the method as decompiled.
1444 // Do it only for transition from alive.
1445 inc_decompile_count();
1446 }
1447
1448 // If the state is becoming a zombie, signal to unregister the nmethod with
1449 // the heap.
1450 // This nmethod may have already been unloaded during a full GC.
1451 if ((state == zombie) && !is_unloaded()) {
1452 nmethod_needs_unregister = true;
1453 }
1454
1455 // Must happen before state change. Otherwise we have a race condition in
1456 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately
1457 // transition its state from 'not_entrant' to 'zombie' without having to wait
1458 // for stack scanning.
1459 if (state == not_entrant) {
1460 mark_as_seen_on_stack();
1461 OrderAccess::storestore();
1462 }
1463
1464 // Change state
1465 _state = state;
1466
1467 // Log the transition once
1468 log_state_change();
1469
1470 // Remove nmethod from method.
1471 // We need to check if both the _code and _from_compiled_code_entry_point
1472 // refer to this nmethod because there is a race in setting these two fields
1473 // in Method* as seen in bugid 4947125.
1474 // If the vep() points to the zombie nmethod, the memory for the nmethod
1475 // could be flushed and the compiler and vtable stubs could still call
1476 // through it.
1477 if (method() != NULL && (method()->code() == this ||
1478 method()->from_compiled_entry() == verified_entry_point())) {
1479 HandleMark hm;
1480 method()->clear_code();
1481 }
1482 } // leave critical region under Patching_lock
1483
1484 // When the nmethod becomes zombie it is no longer alive so the
1485 // dependencies must be flushed. nmethods in the not_entrant
1486 // state will be flushed later when the transition to zombie
1487 // happens or they get unloaded.
1488 if (state == zombie) {
1489 {
1490 // Flushing dependecies must be done before any possible
1491 // safepoint can sneak in, otherwise the oops used by the
1492 // dependency logic could have become stale.
1493 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1494 if (nmethod_needs_unregister) {
1495 Universe::heap()->unregister_nmethod(this);
1496 }
1497 flush_dependencies(NULL);
1498 }
1499
1500 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload
1501 // event and it hasn't already been reported for this nmethod then
1502 // report it now. The event may have been reported earilier if the GC
1503 // marked it for unloading). JvmtiDeferredEventQueue support means
1504 // we no longer go to a safepoint here.
1505 post_compiled_method_unload();
1506
1507 #ifdef ASSERT
1508 // It's no longer safe to access the oops section since zombie
1509 // nmethods aren't scanned for GC.
1510 _oops_are_stale = true;
1511 #endif
1512 // the Method may be reclaimed by class unloading now that the
1513 // nmethod is in zombie state
1514 set_method(NULL);
1515 } else {
1516 assert(state == not_entrant, "other cases may need to be handled differently");
1517 }
1518
1519 JVMCI_ONLY(maybe_invalidate_installed_code());
1520
1521 if (TraceCreateZombies) {
1522 ResourceMark m;
1523 tty->print_cr("nmethod <" INTPTR_FORMAT "> %s code made %s", p2i(this), this->method() ? this->method()->name_and_sig_as_C_string() : "null", (state == not_entrant) ? "not entrant" : "zombie");
1524 }
1525
1526 NMethodSweeper::report_state_change(this);
1527 return true;
1528 }
1529
1530 void nmethod::flush() {
1531 // Note that there are no valid oops in the nmethod anymore.
1532 assert(is_zombie() || (is_osr_method() && is_unloaded()), "must be a zombie method");
1533 assert(is_marked_for_reclamation() || (is_osr_method() && is_unloaded()), "must be marked for reclamation");
1534
1535 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed");
1536 assert_locked_or_safepoint(CodeCache_lock);
1537
1538 // completely deallocate this method
1539 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, p2i(this));
1540 if (PrintMethodFlushing) {
1541 tty->print_cr("*flushing nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT
1542 "/Free CodeCache:" SIZE_FORMAT "Kb",
1543 _compile_id, p2i(this), CodeCache::blob_count(),
1544 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024);
1545 }
1546
1547 // We need to deallocate any ExceptionCache data.
1548 // Note that we do not need to grab the nmethod lock for this, it
1549 // better be thread safe if we're disposing of it!
1550 ExceptionCache* ec = exception_cache();
1551 set_exception_cache(NULL);
1552 while(ec != NULL) {
1553 ExceptionCache* next = ec->next();
1554 delete ec;
1555 ec = next;
1556 }
1557
1558 if (on_scavenge_root_list()) {
1559 CodeCache::drop_scavenge_root_nmethod(this);
1560 }
1561
1562 #ifdef SHARK
1563 ((SharkCompiler *) compiler())->free_compiled_method(insts_begin());
1564 #endif // SHARK
1565
1566 ((CodeBlob*)(this))->flush();
1567
1568 CodeCache::free(this);
1569 }
1570
1571 //
1572 // Notify all classes this nmethod is dependent on that it is no
1573 // longer dependent. This should only be called in two situations.
1574 // First, when a nmethod transitions to a zombie all dependents need
1575 // to be clear. Since zombification happens at a safepoint there's no
1576 // synchronization issues. The second place is a little more tricky.
1577 // During phase 1 of mark sweep class unloading may happen and as a
1578 // result some nmethods may get unloaded. In this case the flushing
1579 // of dependencies must happen during phase 1 since after GC any
1580 // dependencies in the unloaded nmethod won't be updated, so
1581 // traversing the dependency information in unsafe. In that case this
1582 // function is called with a non-NULL argument and this function only
1583 // notifies instanceKlasses that are reachable
1584
1585 void nmethod::flush_dependencies(BoolObjectClosure* is_alive) {
1586 assert_locked_or_safepoint(CodeCache_lock);
1587 assert(Universe::heap()->is_gc_active() == (is_alive != NULL),
1588 "is_alive is non-NULL if and only if we are called during GC");
1589 if (!has_flushed_dependencies()) {
1590 set_has_flushed_dependencies();
1591 for (Dependencies::DepStream deps(this); deps.next(); ) {
1592 if (deps.type() == Dependencies::call_site_target_value) {
1593 // CallSite dependencies are managed on per-CallSite instance basis.
1594 oop call_site = deps.argument_oop(0);
1595 MethodHandles::remove_dependent_nmethod(call_site, this);
1596 } else {
1597 Klass* klass = deps.context_type();
1598 if (klass == NULL) {
1599 continue; // ignore things like evol_method
1600 }
1601 // During GC the is_alive closure is non-NULL, and is used to
1602 // determine liveness of dependees that need to be updated.
1603 if (is_alive == NULL || klass->is_loader_alive(is_alive)) {
1604 // The GC defers deletion of this entry, since there might be multiple threads
1605 // iterating over the _dependencies graph. Other call paths are single-threaded
1606 // and may delete it immediately.
1607 bool delete_immediately = is_alive == NULL;
1608 InstanceKlass::cast(klass)->remove_dependent_nmethod(this, delete_immediately);
1609 }
1610 }
1611 }
1612 }
1613 }
1614
1615
1616 // If this oop is not live, the nmethod can be unloaded.
1617 bool nmethod::can_unload(BoolObjectClosure* is_alive, oop* root, bool unloading_occurred) {
1618 assert(root != NULL, "just checking");
1619 oop obj = *root;
1620 if (obj == NULL || is_alive->do_object_b(obj)) {
1621 return false;
1622 }
1623
1624 // If ScavengeRootsInCode is true, an nmethod might be unloaded
1625 // simply because one of its constant oops has gone dead.
1626 // No actual classes need to be unloaded in order for this to occur.
1627 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading");
1628 make_unloaded(is_alive, obj);
1629 return true;
1630 }
1631
1632 // ------------------------------------------------------------------
1633 // post_compiled_method_load_event
1634 // new method for install_code() path
1635 // Transfer information from compilation to jvmti
1636 void nmethod::post_compiled_method_load_event() {
1637
1638 Method* moop = method();
1639 HOTSPOT_COMPILED_METHOD_LOAD(
1640 (char *) moop->klass_name()->bytes(),
1641 moop->klass_name()->utf8_length(),
1642 (char *) moop->name()->bytes(),
1643 moop->name()->utf8_length(),
1644 (char *) moop->signature()->bytes(),
1645 moop->signature()->utf8_length(),
1646 insts_begin(), insts_size());
1647
1648 if (JvmtiExport::should_post_compiled_method_load() ||
1649 JvmtiExport::should_post_compiled_method_unload()) {
1650 get_and_cache_jmethod_id();
1651 }
1652
1653 if (JvmtiExport::should_post_compiled_method_load()) {
1654 // Let the Service thread (which is a real Java thread) post the event
1655 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1656 JvmtiDeferredEventQueue::enqueue(
1657 JvmtiDeferredEvent::compiled_method_load_event(this));
1658 }
1659 }
1660
1661 jmethodID nmethod::get_and_cache_jmethod_id() {
1662 if (_jmethod_id == NULL) {
1663 // Cache the jmethod_id since it can no longer be looked up once the
1664 // method itself has been marked for unloading.
1665 _jmethod_id = method()->jmethod_id();
1666 }
1667 return _jmethod_id;
1668 }
1669
1670 void nmethod::post_compiled_method_unload() {
1671 if (unload_reported()) {
1672 // During unloading we transition to unloaded and then to zombie
1673 // and the unloading is reported during the first transition.
1674 return;
1675 }
1676
1677 assert(_method != NULL && !is_unloaded(), "just checking");
1678 DTRACE_METHOD_UNLOAD_PROBE(method());
1679
1680 // If a JVMTI agent has enabled the CompiledMethodUnload event then
1681 // post the event. Sometime later this nmethod will be made a zombie
1682 // by the sweeper but the Method* will not be valid at that point.
1683 // If the _jmethod_id is null then no load event was ever requested
1684 // so don't bother posting the unload. The main reason for this is
1685 // that the jmethodID is a weak reference to the Method* so if
1686 // it's being unloaded there's no way to look it up since the weak
1687 // ref will have been cleared.
1688 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) {
1689 assert(!unload_reported(), "already unloaded");
1690 JvmtiDeferredEvent event =
1691 JvmtiDeferredEvent::compiled_method_unload_event(this,
1692 _jmethod_id, insts_begin());
1693 if (SafepointSynchronize::is_at_safepoint()) {
1694 // Don't want to take the queueing lock. Add it as pending and
1695 // it will get enqueued later.
1696 JvmtiDeferredEventQueue::add_pending_event(event);
1697 } else {
1698 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1699 JvmtiDeferredEventQueue::enqueue(event);
1700 }
1701 }
1702
1703 // The JVMTI CompiledMethodUnload event can be enabled or disabled at
1704 // any time. As the nmethod is being unloaded now we mark it has
1705 // having the unload event reported - this will ensure that we don't
1706 // attempt to report the event in the unlikely scenario where the
1707 // event is enabled at the time the nmethod is made a zombie.
1708 set_unload_reported();
1709 }
1710
1711 void static clean_ic_if_metadata_is_dead(CompiledIC *ic, BoolObjectClosure *is_alive) {
1712 if (ic->is_icholder_call()) {
1713 // The only exception is compiledICHolder oops which may
1714 // yet be marked below. (We check this further below).
1715 CompiledICHolder* cichk_oop = ic->cached_icholder();
1716
1717 if (cichk_oop->holder_method()->method_holder()->is_loader_alive(is_alive) &&
1718 cichk_oop->holder_klass()->is_loader_alive(is_alive)) {
1719 return;
1720 }
1721 } else {
1722 Metadata* ic_oop = ic->cached_metadata();
1723 if (ic_oop != NULL) {
1724 if (ic_oop->is_klass()) {
1725 if (((Klass*)ic_oop)->is_loader_alive(is_alive)) {
1726 return;
1727 }
1728 } else if (ic_oop->is_method()) {
1729 if (((Method*)ic_oop)->method_holder()->is_loader_alive(is_alive)) {
1730 return;
1731 }
1732 } else {
1733 ShouldNotReachHere();
1734 }
1735 }
1736 }
1737
1738 ic->set_to_clean();
1739 }
1740
1741 // This is called at the end of the strong tracing/marking phase of a
1742 // GC to unload an nmethod if it contains otherwise unreachable
1743 // oops.
1744
1745 void nmethod::do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred) {
1746 // Make sure the oop's ready to receive visitors
1747 assert(!is_zombie() && !is_unloaded(),
1748 "should not call follow on zombie or unloaded nmethod");
1749
1750 // If the method is not entrant then a JMP is plastered over the
1751 // first few bytes. If an oop in the old code was there, that oop
1752 // should not get GC'd. Skip the first few bytes of oops on
1753 // not-entrant methods.
1754 address low_boundary = verified_entry_point();
1755 if (is_not_entrant()) {
1756 low_boundary += NativeJump::instruction_size;
1757 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1758 // (See comment above.)
1759 }
1760
1761 // The RedefineClasses() API can cause the class unloading invariant
1762 // to no longer be true. See jvmtiExport.hpp for details.
1763 // Also, leave a debugging breadcrumb in local flag.
1764 if (JvmtiExport::has_redefined_a_class()) {
1765 // This set of the unloading_occurred flag is done before the
1766 // call to post_compiled_method_unload() so that the unloading
1767 // of this nmethod is reported.
1768 unloading_occurred = true;
1769 }
1770
1771 // Exception cache
1772 clean_exception_cache(is_alive);
1773
1774 // If class unloading occurred we first iterate over all inline caches and
1775 // clear ICs where the cached oop is referring to an unloaded klass or method.
1776 // The remaining live cached oops will be traversed in the relocInfo::oop_type
1777 // iteration below.
1778 if (unloading_occurred) {
1779 RelocIterator iter(this, low_boundary);
1780 while(iter.next()) {
1781 if (iter.type() == relocInfo::virtual_call_type) {
1782 CompiledIC *ic = CompiledIC_at(&iter);
1783 clean_ic_if_metadata_is_dead(ic, is_alive);
1784 }
1785 }
1786 }
1787
1788 // Compiled code
1789 {
1790 RelocIterator iter(this, low_boundary);
1791 while (iter.next()) {
1792 if (iter.type() == relocInfo::oop_type) {
1793 oop_Relocation* r = iter.oop_reloc();
1794 // In this loop, we must only traverse those oops directly embedded in
1795 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1796 assert(1 == (r->oop_is_immediate()) +
1797 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1798 "oop must be found in exactly one place");
1799 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1800 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) {
1801 return;
1802 }
1803 }
1804 }
1805 }
1806 }
1807
1808
1809 // Scopes
1810 for (oop* p = oops_begin(); p < oops_end(); p++) {
1811 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1812 if (can_unload(is_alive, p, unloading_occurred)) {
1813 return;
1814 }
1815 }
1816
1817 #if INCLUDE_JVMCI
1818 // Follow JVMCI method
1819 BarrierSet* bs = Universe::heap()->barrier_set();
1820 if (_jvmci_installed_code != NULL) {
1821 if (_jvmci_installed_code->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(_jvmci_installed_code)) {
1822 if (!is_alive->do_object_b(_jvmci_installed_code)) {
1823 clear_jvmci_installed_code();
1824 }
1825 } else {
1826 if (can_unload(is_alive, (oop*)&_jvmci_installed_code, unloading_occurred)) {
1827 return;
1828 }
1829 }
1830 }
1831
1832 if (_speculation_log != NULL) {
1833 if (!is_alive->do_object_b(_speculation_log)) {
1834 bs->write_ref_nmethod_pre(&_speculation_log, this);
1835 _speculation_log = NULL;
1836 bs->write_ref_nmethod_post(&_speculation_log, this);
1837 }
1838 }
1839 #endif
1840
1841
1842 // Ensure that all metadata is still alive
1843 verify_metadata_loaders(low_boundary, is_alive);
1844 }
1845
1846 template <class CompiledICorStaticCall>
1847 static bool clean_if_nmethod_is_unloaded(CompiledICorStaticCall *ic, address addr, BoolObjectClosure *is_alive, nmethod* from) {
1848 // Ok, to lookup references to zombies here
1849 CodeBlob *cb = CodeCache::find_blob_unsafe(addr);
1850 if (cb != NULL && cb->is_nmethod()) {
1851 nmethod* nm = (nmethod*)cb;
1852
1853 if (nm->unloading_clock() != nmethod::global_unloading_clock()) {
1854 // The nmethod has not been processed yet.
1855 return true;
1856 }
1857
1858 // Clean inline caches pointing to both zombie and not_entrant methods
1859 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1860 ic->set_to_clean();
1861 assert(ic->is_clean(), "nmethod " PTR_FORMAT "not clean %s", p2i(from), from->method()->name_and_sig_as_C_string());
1862 }
1863 }
1864
1865 return false;
1866 }
1867
1868 static bool clean_if_nmethod_is_unloaded(CompiledIC *ic, BoolObjectClosure *is_alive, nmethod* from) {
1869 return clean_if_nmethod_is_unloaded(ic, ic->ic_destination(), is_alive, from);
1870 }
1871
1872 static bool clean_if_nmethod_is_unloaded(CompiledStaticCall *csc, BoolObjectClosure *is_alive, nmethod* from) {
1873 return clean_if_nmethod_is_unloaded(csc, csc->destination(), is_alive, from);
1874 }
1875
1876 bool nmethod::unload_if_dead_at(RelocIterator* iter_at_oop, BoolObjectClosure *is_alive, bool unloading_occurred) {
1877 assert(iter_at_oop->type() == relocInfo::oop_type, "Wrong relocation type");
1878
1879 oop_Relocation* r = iter_at_oop->oop_reloc();
1880 // Traverse those oops directly embedded in the code.
1881 // Other oops (oop_index>0) are seen as part of scopes_oops.
1882 assert(1 == (r->oop_is_immediate()) +
1883 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1884 "oop must be found in exactly one place");
1885 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1886 // Unload this nmethod if the oop is dead.
1887 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) {
1888 return true;;
1889 }
1890 }
1891
1892 return false;
1893 }
1894
1895
1896 bool nmethod::do_unloading_parallel(BoolObjectClosure* is_alive, bool unloading_occurred) {
1897 ResourceMark rm;
1898
1899 // Make sure the oop's ready to receive visitors
1900 assert(!is_zombie() && !is_unloaded(),
1901 "should not call follow on zombie or unloaded nmethod");
1902
1903 // If the method is not entrant then a JMP is plastered over the
1904 // first few bytes. If an oop in the old code was there, that oop
1905 // should not get GC'd. Skip the first few bytes of oops on
1906 // not-entrant methods.
1907 address low_boundary = verified_entry_point();
1908 if (is_not_entrant()) {
1909 low_boundary += NativeJump::instruction_size;
1910 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1911 // (See comment above.)
1912 }
1913
1914 // The RedefineClasses() API can cause the class unloading invariant
1915 // to no longer be true. See jvmtiExport.hpp for details.
1916 // Also, leave a debugging breadcrumb in local flag.
1917 if (JvmtiExport::has_redefined_a_class()) {
1918 // This set of the unloading_occurred flag is done before the
1919 // call to post_compiled_method_unload() so that the unloading
1920 // of this nmethod is reported.
1921 unloading_occurred = true;
1922 }
1923
1924 // Exception cache
1925 clean_exception_cache(is_alive);
1926
1927 bool is_unloaded = false;
1928 bool postponed = false;
1929
1930 RelocIterator iter(this, low_boundary);
1931 while(iter.next()) {
1932
1933 switch (iter.type()) {
1934
1935 case relocInfo::virtual_call_type:
1936 if (unloading_occurred) {
1937 // If class unloading occurred we first iterate over all inline caches and
1938 // clear ICs where the cached oop is referring to an unloaded klass or method.
1939 clean_ic_if_metadata_is_dead(CompiledIC_at(&iter), is_alive);
1940 }
1941
1942 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
1943 break;
1944
1945 case relocInfo::opt_virtual_call_type:
1946 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
1947 break;
1948
1949 case relocInfo::static_call_type:
1950 postponed |= clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this);
1951 break;
1952
1953 case relocInfo::oop_type:
1954 if (!is_unloaded) {
1955 is_unloaded = unload_if_dead_at(&iter, is_alive, unloading_occurred);
1956 }
1957 break;
1958
1959 case relocInfo::metadata_type:
1960 break; // nothing to do.
1961 }
1962 }
1963
1964 if (is_unloaded) {
1965 return postponed;
1966 }
1967
1968 // Scopes
1969 for (oop* p = oops_begin(); p < oops_end(); p++) {
1970 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1971 if (can_unload(is_alive, p, unloading_occurred)) {
1972 is_unloaded = true;
1973 break;
1974 }
1975 }
1976
1977 if (is_unloaded) {
1978 return postponed;
1979 }
1980
1981 #if INCLUDE_JVMCI
1982 // Follow JVMCI method
1983 BarrierSet* bs = Universe::heap()->barrier_set();
1984 if (_jvmci_installed_code != NULL) {
1985 if (_jvmci_installed_code->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(_jvmci_installed_code)) {
1986 if (!is_alive->do_object_b(_jvmci_installed_code)) {
1987 clear_jvmci_installed_code();
1988 }
1989 } else {
1990 if (can_unload(is_alive, (oop*)&_jvmci_installed_code, unloading_occurred)) {
1991 is_unloaded = true;
1992 }
1993 }
1994 }
1995
1996 if (_speculation_log != NULL) {
1997 if (!is_alive->do_object_b(_speculation_log)) {
1998 bs->write_ref_nmethod_pre(&_speculation_log, this);
1999 _speculation_log = NULL;
2000 bs->write_ref_nmethod_post(&_speculation_log, this);
2001 }
2002 }
2003 #endif
2004
2005 // Ensure that all metadata is still alive
2006 verify_metadata_loaders(low_boundary, is_alive);
2007
2008 return postponed;
2009 }
2010
2011 void nmethod::do_unloading_parallel_postponed(BoolObjectClosure* is_alive, bool unloading_occurred) {
2012 ResourceMark rm;
2013
2014 // Make sure the oop's ready to receive visitors
2015 assert(!is_zombie(),
2016 "should not call follow on zombie nmethod");
2017
2018 // If the method is not entrant then a JMP is plastered over the
2019 // first few bytes. If an oop in the old code was there, that oop
2020 // should not get GC'd. Skip the first few bytes of oops on
2021 // not-entrant methods.
2022 address low_boundary = verified_entry_point();
2023 if (is_not_entrant()) {
2024 low_boundary += NativeJump::instruction_size;
2025 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
2026 // (See comment above.)
2027 }
2028
2029 RelocIterator iter(this, low_boundary);
2030 while(iter.next()) {
2031
2032 switch (iter.type()) {
2033
2034 case relocInfo::virtual_call_type:
2035 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
2036 break;
2037
2038 case relocInfo::opt_virtual_call_type:
2039 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
2040 break;
2041
2042 case relocInfo::static_call_type:
2043 clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this);
2044 break;
2045 }
2046 }
2047 }
2048
2049 #ifdef ASSERT
2050
2051 class CheckClass : AllStatic {
2052 static BoolObjectClosure* _is_alive;
2053
2054 // Check class_loader is alive for this bit of metadata.
2055 static void check_class(Metadata* md) {
2056 Klass* klass = NULL;
2057 if (md->is_klass()) {
2058 klass = ((Klass*)md);
2059 } else if (md->is_method()) {
2060 klass = ((Method*)md)->method_holder();
2061 } else if (md->is_methodData()) {
2062 klass = ((MethodData*)md)->method()->method_holder();
2063 } else {
2064 md->print();
2065 ShouldNotReachHere();
2066 }
2067 assert(klass->is_loader_alive(_is_alive), "must be alive");
2068 }
2069 public:
2070 static void do_check_class(BoolObjectClosure* is_alive, nmethod* nm) {
2071 assert(SafepointSynchronize::is_at_safepoint(), "this is only ok at safepoint");
2072 _is_alive = is_alive;
2073 nm->metadata_do(check_class);
2074 }
2075 };
2076
2077 // This is called during a safepoint so can use static data
2078 BoolObjectClosure* CheckClass::_is_alive = NULL;
2079 #endif // ASSERT
2080
2081
2082 // Processing of oop references should have been sufficient to keep
2083 // all strong references alive. Any weak references should have been
2084 // cleared as well. Visit all the metadata and ensure that it's
2085 // really alive.
2086 void nmethod::verify_metadata_loaders(address low_boundary, BoolObjectClosure* is_alive) {
2087 #ifdef ASSERT
2088 RelocIterator iter(this, low_boundary);
2089 while (iter.next()) {
2090 // static_stub_Relocations may have dangling references to
2091 // Method*s so trim them out here. Otherwise it looks like
2092 // compiled code is maintaining a link to dead metadata.
2093 address static_call_addr = NULL;
2094 if (iter.type() == relocInfo::opt_virtual_call_type) {
2095 CompiledIC* cic = CompiledIC_at(&iter);
2096 if (!cic->is_call_to_interpreted()) {
2097 static_call_addr = iter.addr();
2098 }
2099 } else if (iter.type() == relocInfo::static_call_type) {
2100 CompiledStaticCall* csc = compiledStaticCall_at(iter.reloc());
2101 if (!csc->is_call_to_interpreted()) {
2102 static_call_addr = iter.addr();
2103 }
2104 }
2105 if (static_call_addr != NULL) {
2106 RelocIterator sciter(this, low_boundary);
2107 while (sciter.next()) {
2108 if (sciter.type() == relocInfo::static_stub_type &&
2109 sciter.static_stub_reloc()->static_call() == static_call_addr) {
2110 sciter.static_stub_reloc()->clear_inline_cache();
2111 }
2112 }
2113 }
2114 }
2115 // Check that the metadata embedded in the nmethod is alive
2116 CheckClass::do_check_class(is_alive, this);
2117 #endif
2118 }
2119
2120
2121 // Iterate over metadata calling this function. Used by RedefineClasses
2122 void nmethod::metadata_do(void f(Metadata*)) {
2123 address low_boundary = verified_entry_point();
2124 if (is_not_entrant()) {
2125 low_boundary += NativeJump::instruction_size;
2126 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
2127 // (See comment above.)
2128 }
2129 {
2130 // Visit all immediate references that are embedded in the instruction stream.
2131 RelocIterator iter(this, low_boundary);
2132 while (iter.next()) {
2133 if (iter.type() == relocInfo::metadata_type ) {
2134 metadata_Relocation* r = iter.metadata_reloc();
2135 // In this metadata, we must only follow those metadatas directly embedded in
2136 // the code. Other metadatas (oop_index>0) are seen as part of
2137 // the metadata section below.
2138 assert(1 == (r->metadata_is_immediate()) +
2139 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
2140 "metadata must be found in exactly one place");
2141 if (r->metadata_is_immediate() && r->metadata_value() != NULL) {
2142 Metadata* md = r->metadata_value();
2143 if (md != _method) f(md);
2144 }
2145 } else if (iter.type() == relocInfo::virtual_call_type) {
2146 // Check compiledIC holders associated with this nmethod
2147 CompiledIC *ic = CompiledIC_at(&iter);
2148 if (ic->is_icholder_call()) {
2149 CompiledICHolder* cichk = ic->cached_icholder();
2150 f(cichk->holder_method());
2151 f(cichk->holder_klass());
2152 } else {
2153 Metadata* ic_oop = ic->cached_metadata();
2154 if (ic_oop != NULL) {
2155 f(ic_oop);
2156 }
2157 }
2158 }
2159 }
2160 }
2161
2162 // Visit the metadata section
2163 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
2164 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops
2165 Metadata* md = *p;
2166 f(md);
2167 }
2168
2169 // Visit metadata not embedded in the other places.
2170 if (_method != NULL) f(_method);
2171 }
2172
2173 void nmethod::oops_do(OopClosure* f, bool allow_zombie) {
2174 // make sure the oops ready to receive visitors
2175 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod");
2176 assert(!is_unloaded(), "should not call follow on unloaded nmethod");
2177
2178 // If the method is not entrant or zombie then a JMP is plastered over the
2179 // first few bytes. If an oop in the old code was there, that oop
2180 // should not get GC'd. Skip the first few bytes of oops on
2181 // not-entrant methods.
2182 address low_boundary = verified_entry_point();
2183 if (is_not_entrant()) {
2184 low_boundary += NativeJump::instruction_size;
2185 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
2186 // (See comment above.)
2187 }
2188
2189 #if INCLUDE_JVMCI
2190 if (_jvmci_installed_code != NULL) {
2191 f->do_oop((oop*) &_jvmci_installed_code);
2192 }
2193 if (_speculation_log != NULL) {
2194 f->do_oop((oop*) &_speculation_log);
2195 }
2196 #endif
2197
2198 RelocIterator iter(this, low_boundary);
2199
2200 while (iter.next()) {
2201 if (iter.type() == relocInfo::oop_type ) {
2202 oop_Relocation* r = iter.oop_reloc();
2203 // In this loop, we must only follow those oops directly embedded in
2204 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
2205 assert(1 == (r->oop_is_immediate()) +
2206 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
2207 "oop must be found in exactly one place");
2208 if (r->oop_is_immediate() && r->oop_value() != NULL) {
2209 f->do_oop(r->oop_addr());
2210 }
2211 }
2212 }
2213
2214 // Scopes
2215 // This includes oop constants not inlined in the code stream.
2216 for (oop* p = oops_begin(); p < oops_end(); p++) {
2217 if (*p == Universe::non_oop_word()) continue; // skip non-oops
2218 f->do_oop(p);
2219 }
2220 }
2221
2222 #define NMETHOD_SENTINEL ((nmethod*)badAddress)
2223
2224 nmethod* volatile nmethod::_oops_do_mark_nmethods;
2225
2226 // An nmethod is "marked" if its _mark_link is set non-null.
2227 // Even if it is the end of the linked list, it will have a non-null link value,
2228 // as long as it is on the list.
2229 // This code must be MP safe, because it is used from parallel GC passes.
2230 bool nmethod::test_set_oops_do_mark() {
2231 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");
2232 nmethod* observed_mark_link = _oops_do_mark_link;
2233 if (observed_mark_link == NULL) {
2234 // Claim this nmethod for this thread to mark.
2235 observed_mark_link = (nmethod*)
2236 Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_link, NULL);
2237 if (observed_mark_link == NULL) {
2238
2239 // Atomically append this nmethod (now claimed) to the head of the list:
2240 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods;
2241 for (;;) {
2242 nmethod* required_mark_nmethods = observed_mark_nmethods;
2243 _oops_do_mark_link = required_mark_nmethods;
2244 observed_mark_nmethods = (nmethod*)
2245 Atomic::cmpxchg_ptr(this, &_oops_do_mark_nmethods, required_mark_nmethods);
2246 if (observed_mark_nmethods == required_mark_nmethods)
2247 break;
2248 }
2249 // Mark was clear when we first saw this guy.
2250 if (TraceScavenge) { print_on(tty, "oops_do, mark"); }
2251 return false;
2252 }
2253 }
2254 // On fall through, another racing thread marked this nmethod before we did.
2255 return true;
2256 }
2257
2258 void nmethod::oops_do_marking_prologue() {
2259 if (TraceScavenge) { tty->print_cr("[oops_do_marking_prologue"); }
2260 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row");
2261 // We use cmpxchg_ptr instead of regular assignment here because the user
2262 // may fork a bunch of threads, and we need them all to see the same state.
2263 void* observed = Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, NULL);
2264 guarantee(observed == NULL, "no races in this sequential code");
2265 }
2266
2267 void nmethod::oops_do_marking_epilogue() {
2268 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row");
2269 nmethod* cur = _oops_do_mark_nmethods;
2270 while (cur != NMETHOD_SENTINEL) {
2271 assert(cur != NULL, "not NULL-terminated");
2272 nmethod* next = cur->_oops_do_mark_link;
2273 cur->_oops_do_mark_link = NULL;
2274 DEBUG_ONLY(cur->verify_oop_relocations());
2275 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark"));
2276 cur = next;
2277 }
2278 void* required = _oops_do_mark_nmethods;
2279 void* observed = Atomic::cmpxchg_ptr(NULL, &_oops_do_mark_nmethods, required);
2280 guarantee(observed == required, "no races in this sequential code");
2281 if (TraceScavenge) { tty->print_cr("oops_do_marking_epilogue]"); }
2282 }
2283
2284 class DetectScavengeRoot: public OopClosure {
2285 bool _detected_scavenge_root;
2286 public:
2287 DetectScavengeRoot() : _detected_scavenge_root(false)
2288 { NOT_PRODUCT(_print_nm = NULL); }
2289 bool detected_scavenge_root() { return _detected_scavenge_root; }
2290 virtual void do_oop(oop* p) {
2291 if ((*p) != NULL && (*p)->is_scavengable()) {
2292 NOT_PRODUCT(maybe_print(p));
2293 _detected_scavenge_root = true;
2294 }
2295 }
2296 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2297
2298 #ifndef PRODUCT
2299 nmethod* _print_nm;
2300 void maybe_print(oop* p) {
2301 if (_print_nm == NULL) return;
2302 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root");
2303 tty->print_cr("" PTR_FORMAT "[offset=%d] detected scavengable oop " PTR_FORMAT " (found at " PTR_FORMAT ")",
2304 p2i(_print_nm), (int)((intptr_t)p - (intptr_t)_print_nm),
2305 p2i(*p), p2i(p));
2306 (*p)->print();
2307 }
2308 #endif //PRODUCT
2309 };
2310
2311 bool nmethod::detect_scavenge_root_oops() {
2312 DetectScavengeRoot detect_scavenge_root;
2313 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this);
2314 oops_do(&detect_scavenge_root);
2315 return detect_scavenge_root.detected_scavenge_root();
2316 }
2317
2318 // Method that knows how to preserve outgoing arguments at call. This method must be
2319 // called with a frame corresponding to a Java invoke
2320 void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) {
2321 #ifndef SHARK
2322 if (method() != NULL && !method()->is_native()) {
2323 SimpleScopeDesc ssd(this, fr.pc());
2324 Bytecode_invoke call(ssd.method(), ssd.bci());
2325 bool has_receiver = call.has_receiver();
2326 bool has_appendix = call.has_appendix();
2327 Symbol* signature = call.signature();
2328 fr.oops_compiled_arguments_do(signature, has_receiver, has_appendix, reg_map, f);
2329 }
2330 #endif // !SHARK
2331 }
2332
2333 inline bool includes(void* p, void* from, void* to) {
2334 return from <= p && p < to;
2335 }
2336
2337
2338 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
2339 assert(count >= 2, "must be sentinel values, at least");
2340
2341 #ifdef ASSERT
2342 // must be sorted and unique; we do a binary search in find_pc_desc()
2343 int prev_offset = pcs[0].pc_offset();
2344 assert(prev_offset == PcDesc::lower_offset_limit,
2345 "must start with a sentinel");
2346 for (int i = 1; i < count; i++) {
2347 int this_offset = pcs[i].pc_offset();
2348 assert(this_offset > prev_offset, "offsets must be sorted");
2349 prev_offset = this_offset;
2350 }
2351 assert(prev_offset == PcDesc::upper_offset_limit,
2352 "must end with a sentinel");
2353 #endif //ASSERT
2354
2355 // Search for MethodHandle invokes and tag the nmethod.
2356 for (int i = 0; i < count; i++) {
2357 if (pcs[i].is_method_handle_invoke()) {
2358 set_has_method_handle_invokes(true);
2359 break;
2360 }
2361 }
2362 assert(has_method_handle_invokes() == (_deoptimize_mh_offset != -1), "must have deopt mh handler");
2363
2364 int size = count * sizeof(PcDesc);
2365 assert(scopes_pcs_size() >= size, "oob");
2366 memcpy(scopes_pcs_begin(), pcs, size);
2367
2368 // Adjust the final sentinel downward.
2369 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
2370 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
2371 last_pc->set_pc_offset(content_size() + 1);
2372 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
2373 // Fill any rounding gaps with copies of the last record.
2374 last_pc[1] = last_pc[0];
2375 }
2376 // The following assert could fail if sizeof(PcDesc) is not
2377 // an integral multiple of oopSize (the rounding term).
2378 // If it fails, change the logic to always allocate a multiple
2379 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
2380 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
2381 }
2382
2383 void nmethod::copy_scopes_data(u_char* buffer, int size) {
2384 assert(scopes_data_size() >= size, "oob");
2385 memcpy(scopes_data_begin(), buffer, size);
2386 }
2387
2388 // When using JVMCI the address might be off by the size of a call instruction.
2389 bool nmethod::is_deopt_entry(address pc) {
2390 return pc == deopt_handler_begin()
2391 #if INCLUDE_JVMCI
2392 || pc == (deopt_handler_begin() + NativeCall::instruction_size)
2393 #endif
2394 ;
2395 }
2396
2397 #ifdef ASSERT
2398 static PcDesc* linear_search(nmethod* nm, int pc_offset, bool approximate) {
2399 PcDesc* lower = nm->scopes_pcs_begin();
2400 PcDesc* upper = nm->scopes_pcs_end();
2401 lower += 1; // exclude initial sentinel
2402 PcDesc* res = NULL;
2403 for (PcDesc* p = lower; p < upper; p++) {
2404 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc
2405 if (match_desc(p, pc_offset, approximate)) {
2406 if (res == NULL)
2407 res = p;
2408 else
2409 res = (PcDesc*) badAddress;
2410 }
2411 }
2412 return res;
2413 }
2414 #endif
2415
2416
2417 // Finds a PcDesc with real-pc equal to "pc"
2418 PcDesc* nmethod::find_pc_desc_internal(address pc, bool approximate) {
2419 address base_address = code_begin();
2420 if ((pc < base_address) ||
2421 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
2422 return NULL; // PC is wildly out of range
2423 }
2424 int pc_offset = (int) (pc - base_address);
2425
2426 // Check the PcDesc cache if it contains the desired PcDesc
2427 // (This as an almost 100% hit rate.)
2428 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
2429 if (res != NULL) {
2430 assert(res == linear_search(this, pc_offset, approximate), "cache ok");
2431 return res;
2432 }
2433
2434 // Fallback algorithm: quasi-linear search for the PcDesc
2435 // Find the last pc_offset less than the given offset.
2436 // The successor must be the required match, if there is a match at all.
2437 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
2438 PcDesc* lower = scopes_pcs_begin();
2439 PcDesc* upper = scopes_pcs_end();
2440 upper -= 1; // exclude final sentinel
2441 if (lower >= upper) return NULL; // native method; no PcDescs at all
2442
2443 #define assert_LU_OK \
2444 /* invariant on lower..upper during the following search: */ \
2445 assert(lower->pc_offset() < pc_offset, "sanity"); \
2446 assert(upper->pc_offset() >= pc_offset, "sanity")
2447 assert_LU_OK;
2448
2449 // Use the last successful return as a split point.
2450 PcDesc* mid = _pc_desc_cache.last_pc_desc();
2451 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
2452 if (mid->pc_offset() < pc_offset) {
2453 lower = mid;
2454 } else {
2455 upper = mid;
2456 }
2457
2458 // Take giant steps at first (4096, then 256, then 16, then 1)
2459 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
2460 const int RADIX = (1 << LOG2_RADIX);
2461 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
2462 while ((mid = lower + step) < upper) {
2463 assert_LU_OK;
2464 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
2465 if (mid->pc_offset() < pc_offset) {
2466 lower = mid;
2467 } else {
2468 upper = mid;
2469 break;
2470 }
2471 }
2472 assert_LU_OK;
2473 }
2474
2475 // Sneak up on the value with a linear search of length ~16.
2476 while (true) {
2477 assert_LU_OK;
2478 mid = lower + 1;
2479 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
2480 if (mid->pc_offset() < pc_offset) {
2481 lower = mid;
2482 } else {
2483 upper = mid;
2484 break;
2485 }
2486 }
2487 #undef assert_LU_OK
2488
2489 if (match_desc(upper, pc_offset, approximate)) {
2490 assert(upper == linear_search(this, pc_offset, approximate), "search ok");
2491 _pc_desc_cache.add_pc_desc(upper);
2492 return upper;
2493 } else {
2494 assert(NULL == linear_search(this, pc_offset, approximate), "search ok");
2495 return NULL;
2496 }
2497 }
2498
2499
2500 void nmethod::check_all_dependencies(DepChange& changes) {
2501 // Checked dependencies are allocated into this ResourceMark
2502 ResourceMark rm;
2503
2504 // Turn off dependency tracing while actually testing dependencies.
2505 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) );
2506
2507 typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash,
2508 &DependencySignature::equals, 11027> DepTable;
2509
2510 DepTable* table = new DepTable();
2511
2512 // Iterate over live nmethods and check dependencies of all nmethods that are not
2513 // marked for deoptimization. A particular dependency is only checked once.
2514 NMethodIterator iter;
2515 while(iter.next()) {
2516 nmethod* nm = iter.method();
2517 // Only notify for live nmethods
2518 if (nm->is_alive() && !nm->is_marked_for_deoptimization()) {
2519 for (Dependencies::DepStream deps(nm); deps.next(); ) {
2520 // Construct abstraction of a dependency.
2521 DependencySignature* current_sig = new DependencySignature(deps);
2522
2523 // Determine if dependency is already checked. table->put(...) returns
2524 // 'true' if the dependency is added (i.e., was not in the hashtable).
2525 if (table->put(*current_sig, 1)) {
2526 if (deps.check_dependency() != NULL) {
2527 // Dependency checking failed. Print out information about the failed
2528 // dependency and finally fail with an assert. We can fail here, since
2529 // dependency checking is never done in a product build.
2530 tty->print_cr("Failed dependency:");
2531 changes.print();
2532 nm->print();
2533 nm->print_dependencies();
2534 assert(false, "Should have been marked for deoptimization");
2535 }
2536 }
2537 }
2538 }
2539 }
2540 }
2541
2542 bool nmethod::check_dependency_on(DepChange& changes) {
2543 // What has happened:
2544 // 1) a new class dependee has been added
2545 // 2) dependee and all its super classes have been marked
2546 bool found_check = false; // set true if we are upset
2547 for (Dependencies::DepStream deps(this); deps.next(); ) {
2548 // Evaluate only relevant dependencies.
2549 if (deps.spot_check_dependency_at(changes) != NULL) {
2550 found_check = true;
2551 NOT_DEBUG(break);
2552 }
2553 }
2554 return found_check;
2555 }
2556
2557 bool nmethod::is_evol_dependent_on(Klass* dependee) {
2558 InstanceKlass *dependee_ik = InstanceKlass::cast(dependee);
2559 Array<Method*>* dependee_methods = dependee_ik->methods();
2560 for (Dependencies::DepStream deps(this); deps.next(); ) {
2561 if (deps.type() == Dependencies::evol_method) {
2562 Method* method = deps.method_argument(0);
2563 for (int j = 0; j < dependee_methods->length(); j++) {
2564 if (dependee_methods->at(j) == method) {
2565 // RC_TRACE macro has an embedded ResourceMark
2566 RC_TRACE(0x01000000,
2567 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)",
2568 _method->method_holder()->external_name(),
2569 _method->name()->as_C_string(),
2570 _method->signature()->as_C_string(), compile_id(),
2571 method->method_holder()->external_name(),
2572 method->name()->as_C_string(),
2573 method->signature()->as_C_string()));
2574 if (TraceDependencies || LogCompilation)
2575 deps.log_dependency(dependee);
2576 return true;
2577 }
2578 }
2579 }
2580 }
2581 return false;
2582 }
2583
2584 // Called from mark_for_deoptimization, when dependee is invalidated.
2585 bool nmethod::is_dependent_on_method(Method* dependee) {
2586 for (Dependencies::DepStream deps(this); deps.next(); ) {
2587 if (deps.type() != Dependencies::evol_method)
2588 continue;
2589 Method* method = deps.method_argument(0);
2590 if (method == dependee) return true;
2591 }
2592 return false;
2593 }
2594
2595
2596 bool nmethod::is_patchable_at(address instr_addr) {
2597 assert(insts_contains(instr_addr), "wrong nmethod used");
2598 if (is_zombie()) {
2599 // a zombie may never be patched
2600 return false;
2601 }
2602 return true;
2603 }
2604
2605
2606 address nmethod::continuation_for_implicit_exception(address pc) {
2607 // Exception happened outside inline-cache check code => we are inside
2608 // an active nmethod => use cpc to determine a return address
2609 int exception_offset = pc - code_begin();
2610 int cont_offset = ImplicitExceptionTable(this).at( exception_offset );
2611 #ifdef ASSERT
2612 if (cont_offset == 0) {
2613 Thread* thread = Thread::current();
2614 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
2615 HandleMark hm(thread);
2616 ResourceMark rm(thread);
2617 CodeBlob* cb = CodeCache::find_blob(pc);
2618 assert(cb != NULL && cb == this, "");
2619 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, p2i(pc));
2620 print();
2621 method()->print_codes();
2622 print_code();
2623 print_pcs();
2624 }
2625 #endif
2626 if (cont_offset == 0) {
2627 // Let the normal error handling report the exception
2628 return NULL;
2629 }
2630 return code_begin() + cont_offset;
2631 }
2632
2633
2634
2635 void nmethod_init() {
2636 // make sure you didn't forget to adjust the filler fields
2637 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
2638 }
2639
2640
2641 //-------------------------------------------------------------------------------------------
2642
2643
2644 // QQQ might we make this work from a frame??
2645 nmethodLocker::nmethodLocker(address pc) {
2646 CodeBlob* cb = CodeCache::find_blob(pc);
2647 guarantee(cb != NULL && cb->is_nmethod(), "bad pc for a nmethod found");
2648 _nm = (nmethod*)cb;
2649 lock_nmethod(_nm);
2650 }
2651
2652 // Only JvmtiDeferredEvent::compiled_method_unload_event()
2653 // should pass zombie_ok == true.
2654 void nmethodLocker::lock_nmethod(nmethod* nm, bool zombie_ok) {
2655 if (nm == NULL) return;
2656 Atomic::inc(&nm->_lock_count);
2657 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method");
2658 }
2659
2660 void nmethodLocker::unlock_nmethod(nmethod* nm) {
2661 if (nm == NULL) return;
2662 Atomic::dec(&nm->_lock_count);
2663 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock");
2664 }
2665
2666 // -----------------------------------------------------------------------------
2667 // nmethod::get_deopt_original_pc
2668 //
2669 // Return the original PC for the given PC if:
2670 // (a) the given PC belongs to a nmethod and
2671 // (b) it is a deopt PC
2672 address nmethod::get_deopt_original_pc(const frame* fr) {
2673 if (fr->cb() == NULL) return NULL;
2674
2675 nmethod* nm = fr->cb()->as_nmethod_or_null();
2676 if (nm != NULL && nm->is_deopt_pc(fr->pc()))
2677 return nm->get_original_pc(fr);
2678
2679 return NULL;
2680 }
2681
2682
2683 // -----------------------------------------------------------------------------
2684 // MethodHandle
2685
2686 bool nmethod::is_method_handle_return(address return_pc) {
2687 if (!has_method_handle_invokes()) return false;
2688 PcDesc* pd = pc_desc_at(return_pc);
2689 if (pd == NULL)
2690 return false;
2691 return pd->is_method_handle_invoke();
2692 }
2693
2694
2695 // -----------------------------------------------------------------------------
2696 // Verification
2697
2698 class VerifyOopsClosure: public OopClosure {
2699 nmethod* _nm;
2700 bool _ok;
2701 public:
2702 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
2703 bool ok() { return _ok; }
2704 virtual void do_oop(oop* p) {
2705 if ((*p) == NULL || (*p)->is_oop()) return;
2706 if (_ok) {
2707 _nm->print_nmethod(true);
2708 _ok = false;
2709 }
2710 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2711 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2712 }
2713 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2714 };
2715
2716 void nmethod::verify() {
2717
2718 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant
2719 // seems odd.
2720
2721 if (is_zombie() || is_not_entrant() || is_unloaded())
2722 return;
2723
2724 // Make sure all the entry points are correctly aligned for patching.
2725 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
2726
2727 // assert(method()->is_oop(), "must be valid");
2728
2729 ResourceMark rm;
2730
2731 if (!CodeCache::contains(this)) {
2732 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this));
2733 }
2734
2735 if(is_native_method() )
2736 return;
2737
2738 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
2739 if (nm != this) {
2740 fatal("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this));
2741 }
2742
2743 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2744 if (! p->verify(this)) {
2745 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this));
2746 }
2747 }
2748
2749 VerifyOopsClosure voc(this);
2750 oops_do(&voc);
2751 assert(voc.ok(), "embedded oops must be OK");
2752 verify_scavenge_root_oops();
2753
2754 verify_scopes();
2755 }
2756
2757
2758 void nmethod::verify_interrupt_point(address call_site) {
2759 // Verify IC only when nmethod installation is finished.
2760 bool is_installed = (method()->code() == this) // nmethod is in state 'in_use' and installed
2761 || !this->is_in_use(); // nmethod is installed, but not in 'in_use' state
2762 if (is_installed) {
2763 Thread *cur = Thread::current();
2764 if (CompiledIC_lock->owner() == cur ||
2765 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) &&
2766 SafepointSynchronize::is_at_safepoint())) {
2767 CompiledIC_at(this, call_site);
2768 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
2769 } else {
2770 MutexLocker ml_verify (CompiledIC_lock);
2771 CompiledIC_at(this, call_site);
2772 }
2773 }
2774
2775 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address());
2776 assert(pd != NULL, "PcDesc must exist");
2777 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(),
2778 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(),
2779 pd->return_oop());
2780 !sd->is_top(); sd = sd->sender()) {
2781 sd->verify();
2782 }
2783 }
2784
2785 void nmethod::verify_scopes() {
2786 if( !method() ) return; // Runtime stubs have no scope
2787 if (method()->is_native()) return; // Ignore stub methods.
2788 // iterate through all interrupt point
2789 // and verify the debug information is valid.
2790 RelocIterator iter((nmethod*)this);
2791 while (iter.next()) {
2792 address stub = NULL;
2793 switch (iter.type()) {
2794 case relocInfo::virtual_call_type:
2795 verify_interrupt_point(iter.addr());
2796 break;
2797 case relocInfo::opt_virtual_call_type:
2798 stub = iter.opt_virtual_call_reloc()->static_stub();
2799 verify_interrupt_point(iter.addr());
2800 break;
2801 case relocInfo::static_call_type:
2802 stub = iter.static_call_reloc()->static_stub();
2803 //verify_interrupt_point(iter.addr());
2804 break;
2805 case relocInfo::runtime_call_type:
2806 address destination = iter.reloc()->value();
2807 // Right now there is no way to find out which entries support
2808 // an interrupt point. It would be nice if we had this
2809 // information in a table.
2810 break;
2811 }
2812 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section");
2813 }
2814 }
2815
2816
2817 // -----------------------------------------------------------------------------
2818 // Non-product code
2819 #ifndef PRODUCT
2820
2821 class DebugScavengeRoot: public OopClosure {
2822 nmethod* _nm;
2823 bool _ok;
2824 public:
2825 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { }
2826 bool ok() { return _ok; }
2827 virtual void do_oop(oop* p) {
2828 if ((*p) == NULL || !(*p)->is_scavengable()) return;
2829 if (_ok) {
2830 _nm->print_nmethod(true);
2831 _ok = false;
2832 }
2833 tty->print_cr("*** scavengable oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2834 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2835 (*p)->print();
2836 }
2837 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2838 };
2839
2840 void nmethod::verify_scavenge_root_oops() {
2841 if (UseG1GC) {
2842 return;
2843 }
2844
2845 if (!on_scavenge_root_list()) {
2846 // Actually look inside, to verify the claim that it's clean.
2847 DebugScavengeRoot debug_scavenge_root(this);
2848 oops_do(&debug_scavenge_root);
2849 if (!debug_scavenge_root.ok())
2850 fatal("found an unadvertised bad scavengable oop in the code cache");
2851 }
2852 assert(scavenge_root_not_marked(), "");
2853 }
2854
2855 #endif // PRODUCT
2856
2857 // Printing operations
2858
2859 void nmethod::print() const {
2860 ResourceMark rm;
2861 ttyLocker ttyl; // keep the following output all in one block
2862
2863 tty->print("Compiled method ");
2864
2865 if (is_compiled_by_c1()) {
2866 tty->print("(c1) ");
2867 } else if (is_compiled_by_c2()) {
2868 tty->print("(c2) ");
2869 } else if (is_compiled_by_shark()) {
2870 tty->print("(shark) ");
2871 } else if (is_compiled_by_jvmci()) {
2872 tty->print("(JVMCI) ");
2873 } else {
2874 tty->print("(nm) ");
2875 }
2876
2877 print_on(tty, NULL);
2878
2879 if (WizardMode) {
2880 tty->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this));
2881 tty->print(" for method " INTPTR_FORMAT , p2i(method()));
2882 tty->print(" { ");
2883 if (is_in_use()) tty->print("in_use ");
2884 if (is_not_entrant()) tty->print("not_entrant ");
2885 if (is_zombie()) tty->print("zombie ");
2886 if (is_unloaded()) tty->print("unloaded ");
2887 if (on_scavenge_root_list()) tty->print("scavenge_root ");
2888 tty->print_cr("}:");
2889 }
2890 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2891 p2i(this),
2892 p2i(this) + size(),
2893 size());
2894 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2895 p2i(relocation_begin()),
2896 p2i(relocation_end()),
2897 relocation_size());
2898 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2899 p2i(consts_begin()),
2900 p2i(consts_end()),
2901 consts_size());
2902 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2903 p2i(insts_begin()),
2904 p2i(insts_end()),
2905 insts_size());
2906 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2907 p2i(stub_begin()),
2908 p2i(stub_end()),
2909 stub_size());
2910 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2911 p2i(oops_begin()),
2912 p2i(oops_end()),
2913 oops_size());
2914 if (metadata_size () > 0) tty->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2915 p2i(metadata_begin()),
2916 p2i(metadata_end()),
2917 metadata_size());
2918 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2919 p2i(scopes_data_begin()),
2920 p2i(scopes_data_end()),
2921 scopes_data_size());
2922 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2923 p2i(scopes_pcs_begin()),
2924 p2i(scopes_pcs_end()),
2925 scopes_pcs_size());
2926 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2927 p2i(dependencies_begin()),
2928 p2i(dependencies_end()),
2929 dependencies_size());
2930 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2931 p2i(handler_table_begin()),
2932 p2i(handler_table_end()),
2933 handler_table_size());
2934 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2935 p2i(nul_chk_table_begin()),
2936 p2i(nul_chk_table_end()),
2937 nul_chk_table_size());
2938 }
2939
2940 void nmethod::print_code() {
2941 HandleMark hm;
2942 ResourceMark m;
2943 Disassembler::decode(this);
2944 }
2945
2946
2947 #ifndef PRODUCT
2948
2949 void nmethod::print_scopes() {
2950 // Find the first pc desc for all scopes in the code and print it.
2951 ResourceMark rm;
2952 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2953 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
2954 continue;
2955
2956 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
2957 while (sd != NULL) {
2958 sd->print_on(tty, p);
2959 sd = sd->sender();
2960 }
2961 }
2962 }
2963
2964 void nmethod::print_dependencies() {
2965 ResourceMark rm;
2966 ttyLocker ttyl; // keep the following output all in one block
2967 tty->print_cr("Dependencies:");
2968 for (Dependencies::DepStream deps(this); deps.next(); ) {
2969 deps.print_dependency();
2970 Klass* ctxk = deps.context_type();
2971 if (ctxk != NULL) {
2972 if (ctxk->is_instance_klass() && InstanceKlass::cast(ctxk)->is_dependent_nmethod(this)) {
2973 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name());
2974 }
2975 }
2976 deps.log_dependency(); // put it into the xml log also
2977 }
2978 }
2979
2980
2981 void nmethod::print_relocations() {
2982 ResourceMark m; // in case methods get printed via the debugger
2983 tty->print_cr("relocations:");
2984 RelocIterator iter(this);
2985 iter.print();
2986 if (UseRelocIndex) {
2987 jint* index_end = (jint*)relocation_end() - 1;
2988 jint index_size = *index_end;
2989 jint* index_start = (jint*)( (address)index_end - index_size );
2990 tty->print_cr(" index @" INTPTR_FORMAT ": index_size=%d", p2i(index_start), index_size);
2991 if (index_size > 0) {
2992 jint* ip;
2993 for (ip = index_start; ip+2 <= index_end; ip += 2)
2994 tty->print_cr(" (%d %d) addr=" INTPTR_FORMAT " @" INTPTR_FORMAT,
2995 ip[0],
2996 ip[1],
2997 p2i(header_end()+ip[0]),
2998 p2i(relocation_begin()-1+ip[1]));
2999 for (; ip < index_end; ip++)
3000 tty->print_cr(" (%d ?)", ip[0]);
3001 tty->print_cr(" @" INTPTR_FORMAT ": index_size=%d", p2i(ip), *ip);
3002 ip++;
3003 tty->print_cr("reloc_end @" INTPTR_FORMAT ":", p2i(ip));
3004 }
3005 }
3006 }
3007
3008
3009 void nmethod::print_pcs() {
3010 ResourceMark m; // in case methods get printed via debugger
3011 tty->print_cr("pc-bytecode offsets:");
3012 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
3013 p->print(this);
3014 }
3015 }
3016
3017 #endif // PRODUCT
3018
3019 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
3020 RelocIterator iter(this, begin, end);
3021 bool have_one = false;
3022 while (iter.next()) {
3023 have_one = true;
3024 switch (iter.type()) {
3025 case relocInfo::none: return "no_reloc";
3026 case relocInfo::oop_type: {
3027 stringStream st;
3028 oop_Relocation* r = iter.oop_reloc();
3029 oop obj = r->oop_value();
3030 st.print("oop(");
3031 if (obj == NULL) st.print("NULL");
3032 else obj->print_value_on(&st);
3033 st.print(")");
3034 return st.as_string();
3035 }
3036 case relocInfo::metadata_type: {
3037 stringStream st;
3038 metadata_Relocation* r = iter.metadata_reloc();
3039 Metadata* obj = r->metadata_value();
3040 st.print("metadata(");
3041 if (obj == NULL) st.print("NULL");
3042 else obj->print_value_on(&st);
3043 st.print(")");
3044 return st.as_string();
3045 }
3046 case relocInfo::runtime_call_type: {
3047 stringStream st;
3048 st.print("runtime_call");
3049 runtime_call_Relocation* r = iter.runtime_call_reloc();
3050 address dest = r->destination();
3051 CodeBlob* cb = CodeCache::find_blob(dest);
3052 if (cb != NULL) {
3053 st.print(" %s", cb->name());
3054 } else {
3055 ResourceMark rm;
3056 const int buflen = 1024;
3057 char* buf = NEW_RESOURCE_ARRAY(char, buflen);
3058 int offset;
3059 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) {
3060 st.print(" %s", buf);
3061 if (offset != 0) {
3062 st.print("+%d", offset);
3063 }
3064 }
3065 }
3066 return st.as_string();
3067 }
3068 case relocInfo::virtual_call_type: return "virtual_call";
3069 case relocInfo::opt_virtual_call_type: return "optimized virtual_call";
3070 case relocInfo::static_call_type: return "static_call";
3071 case relocInfo::static_stub_type: return "static_stub";
3072 case relocInfo::external_word_type: return "external_word";
3073 case relocInfo::internal_word_type: return "internal_word";
3074 case relocInfo::section_word_type: return "section_word";
3075 case relocInfo::poll_type: return "poll";
3076 case relocInfo::poll_return_type: return "poll_return";
3077 case relocInfo::type_mask: return "type_bit_mask";
3078 }
3079 }
3080 return have_one ? "other" : NULL;
3081 }
3082
3083 // Return a the last scope in (begin..end]
3084 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
3085 PcDesc* p = pc_desc_near(begin+1);
3086 if (p != NULL && p->real_pc(this) <= end) {
3087 return new ScopeDesc(this, p->scope_decode_offset(),
3088 p->obj_decode_offset(), p->should_reexecute(), p->rethrow_exception(),
3089 p->return_oop());
3090 }
3091 return NULL;
3092 }
3093
3094 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const {
3095 if (block_begin == entry_point()) stream->print_cr("[Entry Point]");
3096 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]");
3097 if (JVMCI_ONLY(_exception_offset >= 0 &&) block_begin == exception_begin()) stream->print_cr("[Exception Handler]");
3098 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]");
3099 if (JVMCI_ONLY(_deoptimize_offset >= 0 &&) block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]");
3100
3101 if (has_method_handle_invokes())
3102 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]");
3103
3104 if (block_begin == consts_begin()) stream->print_cr("[Constants]");
3105
3106 if (block_begin == entry_point()) {
3107 methodHandle m = method();
3108 if (m.not_null()) {
3109 stream->print(" # ");
3110 m->print_value_on(stream);
3111 stream->cr();
3112 }
3113 if (m.not_null() && !is_osr_method()) {
3114 ResourceMark rm;
3115 int sizeargs = m->size_of_parameters();
3116 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
3117 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
3118 {
3119 int sig_index = 0;
3120 if (!m->is_static())
3121 sig_bt[sig_index++] = T_OBJECT; // 'this'
3122 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) {
3123 BasicType t = ss.type();
3124 sig_bt[sig_index++] = t;
3125 if (type2size[t] == 2) {
3126 sig_bt[sig_index++] = T_VOID;
3127 } else {
3128 assert(type2size[t] == 1, "size is 1 or 2");
3129 }
3130 }
3131 assert(sig_index == sizeargs, "");
3132 }
3133 const char* spname = "sp"; // make arch-specific?
3134 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false);
3135 int stack_slot_offset = this->frame_size() * wordSize;
3136 int tab1 = 14, tab2 = 24;
3137 int sig_index = 0;
3138 int arg_index = (m->is_static() ? 0 : -1);
3139 bool did_old_sp = false;
3140 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) {
3141 bool at_this = (arg_index == -1);
3142 bool at_old_sp = false;
3143 BasicType t = (at_this ? T_OBJECT : ss.type());
3144 assert(t == sig_bt[sig_index], "sigs in sync");
3145 if (at_this)
3146 stream->print(" # this: ");
3147 else
3148 stream->print(" # parm%d: ", arg_index);
3149 stream->move_to(tab1);
3150 VMReg fst = regs[sig_index].first();
3151 VMReg snd = regs[sig_index].second();
3152 if (fst->is_reg()) {
3153 stream->print("%s", fst->name());
3154 if (snd->is_valid()) {
3155 stream->print(":%s", snd->name());
3156 }
3157 } else if (fst->is_stack()) {
3158 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
3159 if (offset == stack_slot_offset) at_old_sp = true;
3160 stream->print("[%s+0x%x]", spname, offset);
3161 } else {
3162 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
3163 }
3164 stream->print(" ");
3165 stream->move_to(tab2);
3166 stream->print("= ");
3167 if (at_this) {
3168 m->method_holder()->print_value_on(stream);
3169 } else {
3170 bool did_name = false;
3171 if (!at_this && ss.is_object()) {
3172 Symbol* name = ss.as_symbol_or_null();
3173 if (name != NULL) {
3174 name->print_value_on(stream);
3175 did_name = true;
3176 }
3177 }
3178 if (!did_name)
3179 stream->print("%s", type2name(t));
3180 }
3181 if (at_old_sp) {
3182 stream->print(" (%s of caller)", spname);
3183 did_old_sp = true;
3184 }
3185 stream->cr();
3186 sig_index += type2size[t];
3187 arg_index += 1;
3188 if (!at_this) ss.next();
3189 }
3190 if (!did_old_sp) {
3191 stream->print(" # ");
3192 stream->move_to(tab1);
3193 stream->print("[%s+0x%x]", spname, stack_slot_offset);
3194 stream->print(" (%s of caller)", spname);
3195 stream->cr();
3196 }
3197 }
3198 }
3199 }
3200
3201 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) {
3202 // First, find an oopmap in (begin, end].
3203 // We use the odd half-closed interval so that oop maps and scope descs
3204 // which are tied to the byte after a call are printed with the call itself.
3205 address base = code_begin();
3206 ImmutableOopMapSet* oms = oop_maps();
3207 if (oms != NULL) {
3208 for (int i = 0, imax = oms->count(); i < imax; i++) {
3209 const ImmutableOopMapPair* pair = oms->pair_at(i);
3210 const ImmutableOopMap* om = pair->get_from(oms);
3211 address pc = base + pair->pc_offset();
3212 if (pc > begin) {
3213 if (pc <= end) {
3214 st->move_to(column);
3215 st->print("; ");
3216 om->print_on(st);
3217 }
3218 break;
3219 }
3220 }
3221 }
3222
3223 // Print any debug info present at this pc.
3224 ScopeDesc* sd = scope_desc_in(begin, end);
3225 if (sd != NULL) {
3226 st->move_to(column);
3227 if (sd->bci() == SynchronizationEntryBCI) {
3228 st->print(";*synchronization entry");
3229 } else {
3230 if (sd->method() == NULL) {
3231 st->print("method is NULL");
3232 } else if (sd->method()->is_native()) {
3233 st->print("method is native");
3234 } else {
3235 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci());
3236 st->print(";*%s", Bytecodes::name(bc));
3237 switch (bc) {
3238 case Bytecodes::_invokevirtual:
3239 case Bytecodes::_invokespecial:
3240 case Bytecodes::_invokestatic:
3241 case Bytecodes::_invokeinterface:
3242 {
3243 Bytecode_invoke invoke(sd->method(), sd->bci());
3244 st->print(" ");
3245 if (invoke.name() != NULL)
3246 invoke.name()->print_symbol_on(st);
3247 else
3248 st->print("<UNKNOWN>");
3249 break;
3250 }
3251 case Bytecodes::_getfield:
3252 case Bytecodes::_putfield:
3253 case Bytecodes::_getstatic:
3254 case Bytecodes::_putstatic:
3255 {
3256 Bytecode_field field(sd->method(), sd->bci());
3257 st->print(" ");
3258 if (field.name() != NULL)
3259 field.name()->print_symbol_on(st);
3260 else
3261 st->print("<UNKNOWN>");
3262 }
3263 }
3264 }
3265 st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop());
3266 }
3267
3268 // Print all scopes
3269 for (;sd != NULL; sd = sd->sender()) {
3270 st->move_to(column);
3271 st->print("; -");
3272 if (sd->method() == NULL) {
3273 st->print("method is NULL");
3274 } else {
3275 sd->method()->print_short_name(st);
3276 }
3277 int lineno = sd->method()->line_number_from_bci(sd->bci());
3278 if (lineno != -1) {
3279 st->print("@%d (line %d)", sd->bci(), lineno);
3280 } else {
3281 st->print("@%d", sd->bci());
3282 }
3283 st->cr();
3284 }
3285 }
3286
3287 // Print relocation information
3288 const char* str = reloc_string_for(begin, end);
3289 if (str != NULL) {
3290 if (sd != NULL) st->cr();
3291 st->move_to(column);
3292 st->print("; {%s}", str);
3293 }
3294 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin());
3295 if (cont_offset != 0) {
3296 st->move_to(column);
3297 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset));
3298 }
3299
3300 }
3301
3302 #ifndef PRODUCT
3303
3304 void nmethod::print_value_on(outputStream* st) const {
3305 st->print("nmethod");
3306 print_on(st, NULL);
3307 }
3308
3309 void nmethod::print_calls(outputStream* st) {
3310 RelocIterator iter(this);
3311 while (iter.next()) {
3312 switch (iter.type()) {
3313 case relocInfo::virtual_call_type:
3314 case relocInfo::opt_virtual_call_type: {
3315 VerifyMutexLocker mc(CompiledIC_lock);
3316 CompiledIC_at(&iter)->print();
3317 break;
3318 }
3319 case relocInfo::static_call_type:
3320 st->print_cr("Static call at " INTPTR_FORMAT, p2i(iter.reloc()->addr()));
3321 compiledStaticCall_at(iter.reloc())->print();
3322 break;
3323 }
3324 }
3325 }
3326
3327 void nmethod::print_handler_table() {
3328 ExceptionHandlerTable(this).print();
3329 }
3330
3331 void nmethod::print_nul_chk_table() {
3332 ImplicitExceptionTable(this).print(code_begin());
3333 }
3334
3335 void nmethod::print_statistics() {
3336 ttyLocker ttyl;
3337 if (xtty != NULL) xtty->head("statistics type='nmethod'");
3338 native_nmethod_stats.print_native_nmethod_stats();
3339 #ifdef COMPILER1
3340 c1_java_nmethod_stats.print_nmethod_stats("C1");
3341 #endif
3342 #ifdef COMPILER2
3343 c2_java_nmethod_stats.print_nmethod_stats("C2");
3344 #endif
3345 #if INCLUDE_JVMCI
3346 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI");
3347 #endif
3348 #ifdef SHARK
3349 shark_java_nmethod_stats.print_nmethod_stats("Shark");
3350 #endif
3351 unknown_java_nmethod_stats.print_nmethod_stats("Unknown");
3352 DebugInformationRecorder::print_statistics();
3353 #ifndef PRODUCT
3354 pc_nmethod_stats.print_pc_stats();
3355 #endif
3356 Dependencies::print_statistics();
3357 if (xtty != NULL) xtty->tail("statistics");
3358 }
3359
3360 #endif // !PRODUCT
3361
3362 #if INCLUDE_JVMCI
3363 void nmethod::clear_jvmci_installed_code() {
3364 // This must be done carefully to maintain nmethod remembered sets properly
3365 BarrierSet* bs = Universe::heap()->barrier_set();
3366 bs->write_ref_nmethod_pre(&_jvmci_installed_code, this);
3367 _jvmci_installed_code = NULL;
3368 bs->write_ref_nmethod_post(&_jvmci_installed_code, this);
3369 }
3370
3371 void nmethod::maybe_invalidate_installed_code() {
3372 if (_jvmci_installed_code != NULL) {
3373 if (!is_alive()) {
3374 // Break the link between nmethod and InstalledCode such that the nmethod
3375 // can subsequently be flushed safely. The link must be maintained while
3376 // the method could have live activations since invalidateInstalledCode
3377 // might want to invalidate all existing activations.
3378 InstalledCode::set_address(_jvmci_installed_code, 0);
3379 InstalledCode::set_entryPoint(_jvmci_installed_code, 0);
3380 clear_jvmci_installed_code();
3381 } else if (is_not_entrant()) {
3382 InstalledCode::set_entryPoint(_jvmci_installed_code, 0);
3383 }
3384 }
3385 }
3386
3387 char* nmethod::jvmci_installed_code_name(char* buf, size_t buflen) {
3388 if (!this->is_compiled_by_jvmci()) {
3389 return NULL;
3390 }
3391 oop installedCode = this->jvmci_installed_code();
3392 if (installedCode != NULL) {
3393 oop installedCodeName = NULL;
3394 if (installedCode->is_a(InstalledCode::klass())) {
3395 installedCodeName = InstalledCode::name(installedCode);
3396 }
3397 if (installedCodeName != NULL) {
3398 return java_lang_String::as_utf8_string(installedCodeName, buf, (int)buflen);
3399 } else {
3400 jio_snprintf(buf, buflen, "null");
3401 return buf;
3402 }
3403 }
3404 jio_snprintf(buf, buflen, "noInstalledCode");
3405 return buf;
3406 }
3407 #endif