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/sharedRuntime.hpp"
45 #include "runtime/sweeper.hpp"
46 #include "utilities/resourceHash.hpp"
47 #include "utilities/dtrace.hpp"
48 #include "utilities/events.hpp"
49 #include "utilities/xmlstream.hpp"
50 #ifdef TARGET_ARCH_x86
51 # include "nativeInst_x86.hpp"
52 #endif
53 #ifdef TARGET_ARCH_sparc
54 # include "nativeInst_sparc.hpp"
55 #endif
56 #ifdef TARGET_ARCH_zero
57 # include "nativeInst_zero.hpp"
58 #endif
59 #ifdef TARGET_ARCH_arm
60 # include "nativeInst_arm.hpp"
61 #endif
62 #ifdef TARGET_ARCH_ppc
63 # include "nativeInst_ppc.hpp"
64 #endif
65 #ifdef SHARK
66 #include "shark/sharkCompiler.hpp"
67 #endif
68 #if INCLUDE_JVMCI
69 #include "jvmci/jvmciJavaClasses.hpp"
70 #endif
71
72 unsigned char nmethod::_global_unloading_clock = 0;
73
74 #ifdef DTRACE_ENABLED
75
76 // Only bother with this argument setup if dtrace is available
77
78 #define DTRACE_METHOD_UNLOAD_PROBE(method) \
79 { \
80 Method* m = (method); \
81 if (m != NULL) { \
82 Symbol* klass_name = m->klass_name(); \
83 Symbol* name = m->name(); \
84 Symbol* signature = m->signature(); \
85 HOTSPOT_COMPILED_METHOD_UNLOAD( \
86 (char *) klass_name->bytes(), klass_name->utf8_length(), \
87 (char *) name->bytes(), name->utf8_length(), \
88 (char *) signature->bytes(), signature->utf8_length()); \
89 } \
90 }
91
92 #else // ndef DTRACE_ENABLED
93
94 #define DTRACE_METHOD_UNLOAD_PROBE(method)
95
96 #endif
97
98 bool nmethod::is_compiled_by_c1() const {
99 if (compiler() == NULL) {
100 return false;
101 }
102 return compiler()->is_c1();
103 }
104 bool nmethod::is_compiled_by_jvmci() const {
105 if (compiler() == NULL || method() == NULL) return false; // can happen during debug printing
106 if (is_native_method()) return false;
107 return compiler()->is_jvmci();
108 }
109 bool nmethod::is_compiled_by_c2() const {
110 if (compiler() == NULL) {
111 return false;
112 }
113 return compiler()->is_c2();
114 }
115 bool nmethod::is_compiled_by_shark() const {
116 if (compiler() == NULL) {
117 return false;
118 }
119 return compiler()->is_shark();
120 }
121
122
123
124 //---------------------------------------------------------------------------------
125 // NMethod statistics
126 // They are printed under various flags, including:
127 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation.
128 // (In the latter two cases, they like other stats are printed to the log only.)
129
130 #ifndef PRODUCT
131 // These variables are put into one block to reduce relocations
132 // and make it simpler to print from the debugger.
133 struct java_nmethod_stats_struct {
134 int nmethod_count;
135 int total_size;
136 int relocation_size;
137 int consts_size;
138 int insts_size;
139 int stub_size;
140 int scopes_data_size;
141 int scopes_pcs_size;
142 int dependencies_size;
143 int handler_table_size;
144 int nul_chk_table_size;
145 int oops_size;
146 int metadata_size;
147
148 void note_nmethod(nmethod* nm) {
149 nmethod_count += 1;
150 total_size += nm->size();
151 relocation_size += nm->relocation_size();
152 consts_size += nm->consts_size();
153 insts_size += nm->insts_size();
154 stub_size += nm->stub_size();
155 oops_size += nm->oops_size();
156 metadata_size += nm->metadata_size();
157 scopes_data_size += nm->scopes_data_size();
158 scopes_pcs_size += nm->scopes_pcs_size();
159 dependencies_size += nm->dependencies_size();
160 handler_table_size += nm->handler_table_size();
161 nul_chk_table_size += nm->nul_chk_table_size();
162 }
163 void print_nmethod_stats(const char* name) {
164 if (nmethod_count == 0) return;
165 tty->print_cr("Statistics for %d bytecoded nmethods for %s:", nmethod_count, name);
166 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size);
167 if (nmethod_count != 0) tty->print_cr(" header = " SIZE_FORMAT, nmethod_count * sizeof(nmethod));
168 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size);
169 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size);
170 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size);
171 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size);
172 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size);
173 if (metadata_size != 0) tty->print_cr(" metadata = %d", metadata_size);
174 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size);
175 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size);
176 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size);
177 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size);
178 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size);
179 }
180 };
181
182 struct native_nmethod_stats_struct {
183 int native_nmethod_count;
184 int native_total_size;
185 int native_relocation_size;
186 int native_insts_size;
187 int native_oops_size;
188 int native_metadata_size;
189 void note_native_nmethod(nmethod* nm) {
190 native_nmethod_count += 1;
191 native_total_size += nm->size();
192 native_relocation_size += nm->relocation_size();
193 native_insts_size += nm->insts_size();
194 native_oops_size += nm->oops_size();
195 native_metadata_size += nm->metadata_size();
196 }
197 void print_native_nmethod_stats() {
198 if (native_nmethod_count == 0) return;
199 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count);
200 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size);
201 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size);
202 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size);
203 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size);
204 if (native_metadata_size != 0) tty->print_cr(" N. metadata = %d", native_metadata_size);
205 }
206 };
207
208 struct pc_nmethod_stats_struct {
209 int pc_desc_resets; // number of resets (= number of caches)
210 int pc_desc_queries; // queries to nmethod::find_pc_desc
211 int pc_desc_approx; // number of those which have approximate true
212 int pc_desc_repeats; // number of _pc_descs[0] hits
213 int pc_desc_hits; // number of LRU cache hits
214 int pc_desc_tests; // total number of PcDesc examinations
215 int pc_desc_searches; // total number of quasi-binary search steps
216 int pc_desc_adds; // number of LUR cache insertions
217
218 void print_pc_stats() {
219 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query",
220 pc_desc_queries,
221 (double)(pc_desc_tests + pc_desc_searches)
222 / pc_desc_queries);
223 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d",
224 pc_desc_resets,
225 pc_desc_queries, pc_desc_approx,
226 pc_desc_repeats, pc_desc_hits,
227 pc_desc_tests, pc_desc_searches, pc_desc_adds);
228 }
229 };
230
231 #ifdef COMPILER1
232 static java_nmethod_stats_struct c1_java_nmethod_stats;
233 #endif
234 #ifdef COMPILER2
235 static java_nmethod_stats_struct c2_java_nmethod_stats;
236 #endif
237 #if INCLUDE_JVMCI
238 static java_nmethod_stats_struct jvmci_java_nmethod_stats;
239 #endif
240 #ifdef SHARK
241 static java_nmethod_stats_struct shark_java_nmethod_stats;
242 #endif
243 static java_nmethod_stats_struct unknown_java_nmethod_stats;
244
245 static native_nmethod_stats_struct native_nmethod_stats;
246 static pc_nmethod_stats_struct pc_nmethod_stats;
247
248 static void note_java_nmethod(nmethod* nm) {
249 #ifdef COMPILER1
250 if (nm->is_compiled_by_c1()) {
251 c1_java_nmethod_stats.note_nmethod(nm);
252 } else
253 #endif
254 #ifdef COMPILER2
255 if (nm->is_compiled_by_c2()) {
256 c2_java_nmethod_stats.note_nmethod(nm);
257 } else
258 #endif
259 #if INCLUDE_JVMCI
260 if (nm->is_compiled_by_jvmci()) {
261 jvmci_java_nmethod_stats.note_nmethod(nm);
262 } else
263 #endif
264 #ifdef SHARK
265 if (nm->is_compiled_by_shark()) {
266 shark_java_nmethod_stats.note_nmethod(nm);
267 } else
268 #endif
269 {
270 unknown_java_nmethod_stats.note_nmethod(nm);
271 }
272 }
273 #endif // !PRODUCT
274
275 //---------------------------------------------------------------------------------
276
277
278 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) {
279 assert(pc != NULL, "Must be non null");
280 assert(exception.not_null(), "Must be non null");
281 assert(handler != NULL, "Must be non null");
282
283 _count = 0;
284 _exception_type = exception->klass();
285 _next = NULL;
286
287 add_address_and_handler(pc,handler);
288 }
289
290
291 address ExceptionCache::match(Handle exception, address pc) {
292 assert(pc != NULL,"Must be non null");
293 assert(exception.not_null(),"Must be non null");
294 if (exception->klass() == exception_type()) {
295 return (test_address(pc));
296 }
297
298 return NULL;
299 }
300
301
302 bool ExceptionCache::match_exception_with_space(Handle exception) {
303 assert(exception.not_null(),"Must be non null");
304 if (exception->klass() == exception_type() && count() < cache_size) {
305 return true;
306 }
307 return false;
308 }
309
310
311 address ExceptionCache::test_address(address addr) {
312 for (int i=0; i<count(); i++) {
313 if (pc_at(i) == addr) {
314 return handler_at(i);
315 }
316 }
317 return NULL;
318 }
319
320
321 bool ExceptionCache::add_address_and_handler(address addr, address handler) {
322 if (test_address(addr) == handler) return true;
323 if (count() < cache_size) {
324 set_pc_at(count(),addr);
325 set_handler_at(count(), handler);
326 increment_count();
327 return true;
328 }
329 return false;
330 }
331
332
333 // private method for handling exception cache
334 // These methods are private, and used to manipulate the exception cache
335 // directly.
336 ExceptionCache* nmethod::exception_cache_entry_for_exception(Handle exception) {
337 ExceptionCache* ec = exception_cache();
338 while (ec != NULL) {
339 if (ec->match_exception_with_space(exception)) {
340 return ec;
341 }
342 ec = ec->next();
343 }
344 return NULL;
345 }
346
347
348 //-----------------------------------------------------------------------------
349
350
351 // Helper used by both find_pc_desc methods.
352 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) {
353 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_tests);
354 if (!approximate)
355 return pc->pc_offset() == pc_offset;
356 else
357 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset();
358 }
359
360 void PcDescCache::reset_to(PcDesc* initial_pc_desc) {
361 if (initial_pc_desc == NULL) {
362 _pc_descs[0] = NULL; // native method; no PcDescs at all
363 return;
364 }
365 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_resets);
366 // reset the cache by filling it with benign (non-null) values
367 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel");
368 for (int i = 0; i < cache_size; i++)
369 _pc_descs[i] = initial_pc_desc;
370 }
371
372 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) {
373 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_queries);
374 NOT_PRODUCT(if (approximate) ++pc_nmethod_stats.pc_desc_approx);
375
376 // Note: one might think that caching the most recently
377 // read value separately would be a win, but one would be
378 // wrong. When many threads are updating it, the cache
379 // line it's in would bounce between caches, negating
380 // any benefit.
381
382 // In order to prevent race conditions do not load cache elements
383 // repeatedly, but use a local copy:
384 PcDesc* res;
385
386 // Step one: Check the most recently added value.
387 res = _pc_descs[0];
388 if (res == NULL) return NULL; // native method; no PcDescs at all
389 if (match_desc(res, pc_offset, approximate)) {
390 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_repeats);
391 return res;
392 }
393
394 // Step two: Check the rest of the LRU cache.
395 for (int i = 1; i < cache_size; ++i) {
396 res = _pc_descs[i];
397 if (res->pc_offset() < 0) break; // optimization: skip empty cache
398 if (match_desc(res, pc_offset, approximate)) {
399 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_hits);
400 return res;
401 }
402 }
403
404 // Report failure.
405 return NULL;
406 }
407
408 void PcDescCache::add_pc_desc(PcDesc* pc_desc) {
409 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_adds);
410 // Update the LRU cache by shifting pc_desc forward.
411 for (int i = 0; i < cache_size; i++) {
412 PcDesc* next = _pc_descs[i];
413 _pc_descs[i] = pc_desc;
414 pc_desc = next;
415 }
416 }
417
418 // adjust pcs_size so that it is a multiple of both oopSize and
419 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple
420 // of oopSize, then 2*sizeof(PcDesc) is)
421 static int adjust_pcs_size(int pcs_size) {
422 int nsize = round_to(pcs_size, oopSize);
423 if ((nsize % sizeof(PcDesc)) != 0) {
424 nsize = pcs_size + sizeof(PcDesc);
425 }
426 assert((nsize % oopSize) == 0, "correct alignment");
427 return nsize;
428 }
429
430 //-----------------------------------------------------------------------------
431
432
433 void nmethod::add_exception_cache_entry(ExceptionCache* new_entry) {
434 assert(ExceptionCache_lock->owned_by_self(),"Must hold the ExceptionCache_lock");
435 assert(new_entry != NULL,"Must be non null");
436 assert(new_entry->next() == NULL, "Must be null");
437
438 if (exception_cache() != NULL) {
439 new_entry->set_next(exception_cache());
440 }
441 set_exception_cache(new_entry);
442 }
443
444 void nmethod::clean_exception_cache(BoolObjectClosure* is_alive) {
445 ExceptionCache* prev = NULL;
446 ExceptionCache* curr = exception_cache();
447
448 while (curr != NULL) {
449 ExceptionCache* next = curr->next();
450
451 Klass* ex_klass = curr->exception_type();
452 if (ex_klass != NULL && !ex_klass->is_loader_alive(is_alive)) {
453 if (prev == NULL) {
454 set_exception_cache(next);
455 } else {
456 prev->set_next(next);
457 }
458 delete curr;
459 // prev stays the same.
460 } else {
461 prev = curr;
462 }
463
464 curr = next;
465 }
466 }
467
468 // public method for accessing the exception cache
469 // These are the public access methods.
470 address nmethod::handler_for_exception_and_pc(Handle exception, address pc) {
471 // We never grab a lock to read the exception cache, so we may
472 // have false negatives. This is okay, as it can only happen during
473 // the first few exception lookups for a given nmethod.
474 ExceptionCache* ec = exception_cache();
475 while (ec != NULL) {
476 address ret_val;
477 if ((ret_val = ec->match(exception,pc)) != NULL) {
478 return ret_val;
479 }
480 ec = ec->next();
481 }
482 return NULL;
483 }
484
485
486 void nmethod::add_handler_for_exception_and_pc(Handle exception, address pc, address handler) {
487 // There are potential race conditions during exception cache updates, so we
488 // must own the ExceptionCache_lock before doing ANY modifications. Because
489 // we don't lock during reads, it is possible to have several threads attempt
490 // to update the cache with the same data. We need to check for already inserted
491 // copies of the current data before adding it.
492
493 MutexLocker ml(ExceptionCache_lock);
494 ExceptionCache* target_entry = exception_cache_entry_for_exception(exception);
495
496 if (target_entry == NULL || !target_entry->add_address_and_handler(pc,handler)) {
497 target_entry = new ExceptionCache(exception,pc,handler);
498 add_exception_cache_entry(target_entry);
499 }
500 }
501
502
503 //-------------end of code for ExceptionCache--------------
504
505
506 int nmethod::total_size() const {
507 return
508 consts_size() +
509 insts_size() +
510 stub_size() +
511 scopes_data_size() +
512 scopes_pcs_size() +
513 handler_table_size() +
514 nul_chk_table_size();
515 }
516
517 const char* nmethod::compile_kind() const {
518 if (is_osr_method()) return "osr";
519 if (method() != NULL && is_native_method()) return "c2n";
520 return NULL;
521 }
522
523 // Fill in default values for various flag fields
524 void nmethod::init_defaults() {
525 _state = in_use;
526 _unloading_clock = 0;
527 _marked_for_reclamation = 0;
528 _has_flushed_dependencies = 0;
529 _has_unsafe_access = 0;
530 _has_method_handle_invokes = 0;
531 _lazy_critical_native = 0;
532 _has_wide_vectors = 0;
533 _marked_for_deoptimization = 0;
534 _lock_count = 0;
535 _stack_traversal_mark = 0;
536 _unload_reported = false; // jvmti state
537
538 #ifdef ASSERT
539 _oops_are_stale = false;
540 #endif
541
542 _oops_do_mark_link = NULL;
543 _jmethod_id = NULL;
544 _osr_link = NULL;
545 if (UseG1GC) {
546 _unloading_next = NULL;
547 } else {
548 _scavenge_root_link = NULL;
549 }
550 _scavenge_root_state = 0;
551 _compiler = NULL;
552 #if INCLUDE_RTM_OPT
553 _rtm_state = NoRTM;
554 #endif
555 #if INCLUDE_JVMCI
556 _jvmci_installed_code = NULL;
557 _speculation_log = NULL;
558 #endif
559 }
560
561 nmethod* nmethod::new_native_nmethod(const methodHandle& method,
562 int compile_id,
563 CodeBuffer *code_buffer,
564 int vep_offset,
565 int frame_complete,
566 int frame_size,
567 ByteSize basic_lock_owner_sp_offset,
568 ByteSize basic_lock_sp_offset,
569 OopMapSet* oop_maps) {
570 code_buffer->finalize_oop_references(method);
571 // create nmethod
572 nmethod* nm = NULL;
573 {
574 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
575 int native_nmethod_size = allocation_size(code_buffer, sizeof(nmethod));
576 CodeOffsets offsets;
577 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
578 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
579 nm = new (native_nmethod_size, CompLevel_none) nmethod(method(), native_nmethod_size,
580 compile_id, &offsets,
581 code_buffer, frame_size,
582 basic_lock_owner_sp_offset,
583 basic_lock_sp_offset, oop_maps);
584 NOT_PRODUCT(if (nm != NULL) native_nmethod_stats.note_native_nmethod(nm));
585 }
586 // verify nmethod
587 debug_only(if (nm) nm->verify();) // might block
588
589 if (nm != NULL) {
590 nm->log_new_nmethod();
591 }
592
593 return nm;
594 }
595
596 nmethod* nmethod::new_nmethod(const methodHandle& method,
597 int compile_id,
598 int entry_bci,
599 CodeOffsets* offsets,
600 int orig_pc_offset,
601 DebugInformationRecorder* debug_info,
602 Dependencies* dependencies,
603 CodeBuffer* code_buffer, int frame_size,
604 OopMapSet* oop_maps,
605 ExceptionHandlerTable* handler_table,
606 ImplicitExceptionTable* nul_chk_table,
607 AbstractCompiler* compiler,
608 int comp_level
609 #if INCLUDE_JVMCI
610 , Handle installed_code,
611 Handle speculationLog
612 #endif
613 )
614 {
615 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
616 code_buffer->finalize_oop_references(method);
617 // create nmethod
618 nmethod* nm = NULL;
619 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
620 int nmethod_size =
621 allocation_size(code_buffer, sizeof(nmethod))
622 + adjust_pcs_size(debug_info->pcs_size())
623 + round_to(dependencies->size_in_bytes() , oopSize)
624 + round_to(handler_table->size_in_bytes(), oopSize)
625 + round_to(nul_chk_table->size_in_bytes(), oopSize)
626 + round_to(debug_info->data_size() , oopSize);
627
628 nm = new (nmethod_size, comp_level)
629 nmethod(method(), nmethod_size, compile_id, entry_bci, offsets,
630 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size,
631 oop_maps,
632 handler_table,
633 nul_chk_table,
634 compiler,
635 comp_level
636 #if INCLUDE_JVMCI
637 , installed_code,
638 speculationLog
639 #endif
640 );
641
642 if (nm != NULL) {
643 // To make dependency checking during class loading fast, record
644 // the nmethod dependencies in the classes it is dependent on.
645 // This allows the dependency checking code to simply walk the
646 // class hierarchy above the loaded class, checking only nmethods
647 // which are dependent on those classes. The slow way is to
648 // check every nmethod for dependencies which makes it linear in
649 // the number of methods compiled. For applications with a lot
650 // classes the slow way is too slow.
651 for (Dependencies::DepStream deps(nm); deps.next(); ) {
652 if (deps.type() == Dependencies::call_site_target_value) {
653 // CallSite dependencies are managed on per-CallSite instance basis.
654 oop call_site = deps.argument_oop(0);
655 MethodHandles::add_dependent_nmethod(call_site, nm);
656 } else {
657 Klass* klass = deps.context_type();
658 if (klass == NULL) {
659 continue; // ignore things like evol_method
660 }
661 // record this nmethod as dependent on this klass
662 InstanceKlass::cast(klass)->add_dependent_nmethod(nm);
663 }
664 }
665 NOT_PRODUCT(if (nm != NULL) note_java_nmethod(nm));
666 }
667 }
668 // Do verification and logging outside CodeCache_lock.
669 if (nm != NULL) {
670 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
671 DEBUG_ONLY(nm->verify();)
672 nm->log_new_nmethod();
673 }
674 return nm;
675 }
676
677 // For native wrappers
678 nmethod::nmethod(
679 Method* method,
680 int nmethod_size,
681 int compile_id,
682 CodeOffsets* offsets,
683 CodeBuffer* code_buffer,
684 int frame_size,
685 ByteSize basic_lock_owner_sp_offset,
686 ByteSize basic_lock_sp_offset,
687 OopMapSet* oop_maps )
688 : CodeBlob("native nmethod", code_buffer, sizeof(nmethod),
689 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps),
690 _native_receiver_sp_offset(basic_lock_owner_sp_offset),
691 _native_basic_lock_sp_offset(basic_lock_sp_offset)
692 {
693 {
694 debug_only(No_Safepoint_Verifier nsv;)
695 assert_locked_or_safepoint(CodeCache_lock);
696
697 init_defaults();
698 _method = method;
699 _entry_bci = InvocationEntryBci;
700 // We have no exception handler or deopt handler make the
701 // values something that will never match a pc like the nmethod vtable entry
702 _exception_offset = 0;
703 _deoptimize_offset = 0;
704 _deoptimize_mh_offset = 0;
705 _orig_pc_offset = 0;
706
707 _consts_offset = data_offset();
708 _stub_offset = data_offset();
709 _oops_offset = data_offset();
710 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize);
711 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize);
712 _scopes_pcs_offset = _scopes_data_offset;
713 _dependencies_offset = _scopes_pcs_offset;
714 _handler_table_offset = _dependencies_offset;
715 _nul_chk_table_offset = _handler_table_offset;
716 _nmethod_end_offset = _nul_chk_table_offset;
717 _compile_id = compile_id;
718 _comp_level = CompLevel_none;
719 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
720 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
721 _osr_entry_point = NULL;
722 _exception_cache = NULL;
723 _pc_desc_cache.reset_to(NULL);
724 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
725
726 code_buffer->copy_values_to(this);
727 if (ScavengeRootsInCode) {
728 if (detect_scavenge_root_oops()) {
729 CodeCache::add_scavenge_root_nmethod(this);
730 }
731 Universe::heap()->register_nmethod(this);
732 }
733 debug_only(verify_scavenge_root_oops());
734 CodeCache::commit(this);
735 }
736
737 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
738 ttyLocker ttyl; // keep the following output all in one block
739 // This output goes directly to the tty, not the compiler log.
740 // To enable tools to match it up with the compilation activity,
741 // be sure to tag this tty output with the compile ID.
742 if (xtty != NULL) {
743 xtty->begin_head("print_native_nmethod");
744 xtty->method(_method);
745 xtty->stamp();
746 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
747 }
748 // print the header part first
749 print();
750 // then print the requested information
751 if (PrintNativeNMethods) {
752 print_code();
753 if (oop_maps != NULL) {
754 oop_maps->print();
755 }
756 }
757 if (PrintRelocations) {
758 print_relocations();
759 }
760 if (xtty != NULL) {
761 xtty->tail("print_native_nmethod");
762 }
763 }
764 }
765
766 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () {
767 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level));
768 }
769
770 nmethod::nmethod(
771 Method* method,
772 int nmethod_size,
773 int compile_id,
774 int entry_bci,
775 CodeOffsets* offsets,
776 int orig_pc_offset,
777 DebugInformationRecorder* debug_info,
778 Dependencies* dependencies,
779 CodeBuffer *code_buffer,
780 int frame_size,
781 OopMapSet* oop_maps,
782 ExceptionHandlerTable* handler_table,
783 ImplicitExceptionTable* nul_chk_table,
784 AbstractCompiler* compiler,
785 int comp_level
786 #if INCLUDE_JVMCI
787 , Handle installed_code,
788 Handle speculation_log
789 #endif
790 )
791 : CodeBlob("nmethod", code_buffer, sizeof(nmethod),
792 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps),
793 _native_receiver_sp_offset(in_ByteSize(-1)),
794 _native_basic_lock_sp_offset(in_ByteSize(-1))
795 {
796 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
797 {
798 debug_only(No_Safepoint_Verifier nsv;)
799 assert_locked_or_safepoint(CodeCache_lock);
800
801 init_defaults();
802 _method = method;
803 _entry_bci = entry_bci;
804 _compile_id = compile_id;
805 _comp_level = comp_level;
806 _compiler = compiler;
807 _orig_pc_offset = orig_pc_offset;
808 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
809
810 // Section offsets
811 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts());
812 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs());
813
814 #if INCLUDE_JVMCI
815 _jvmci_installed_code = installed_code();
816 _speculation_log = (instanceOop)speculation_log();
817
818 if (compiler->is_jvmci()) {
819 // JVMCI might not produce any stub sections
820 if (offsets->value(CodeOffsets::Exceptions) != -1) {
821 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions);
822 } else {
823 _exception_offset = -1;
824 }
825 if (offsets->value(CodeOffsets::Deopt) != -1) {
826 _deoptimize_offset = code_offset() + offsets->value(CodeOffsets::Deopt);
827 } else {
828 _deoptimize_offset = -1;
829 }
830 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
831 _deoptimize_mh_offset = code_offset() + offsets->value(CodeOffsets::DeoptMH);
832 } else {
833 _deoptimize_mh_offset = -1;
834 }
835 } else {
836 #endif
837 // Exception handler and deopt handler are in the stub section
838 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set");
839 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set");
840
841 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
842 _deoptimize_offset = _stub_offset + offsets->value(CodeOffsets::Deopt);
843 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
844 _deoptimize_mh_offset = _stub_offset + offsets->value(CodeOffsets::DeoptMH);
845 } else {
846 _deoptimize_mh_offset = -1;
847 #if INCLUDE_JVMCI
848 }
849 #endif
850 }
851 if (offsets->value(CodeOffsets::UnwindHandler) != -1) {
852 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler);
853 } else {
854 _unwind_handler_offset = -1;
855 }
856
857 _oops_offset = data_offset();
858 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize);
859 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize);
860
861 _scopes_pcs_offset = _scopes_data_offset + round_to(debug_info->data_size (), oopSize);
862 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
863 _handler_table_offset = _dependencies_offset + round_to(dependencies->size_in_bytes (), oopSize);
864 _nul_chk_table_offset = _handler_table_offset + round_to(handler_table->size_in_bytes(), oopSize);
865 _nmethod_end_offset = _nul_chk_table_offset + round_to(nul_chk_table->size_in_bytes(), oopSize);
866
867 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
868 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
869 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry);
870 _exception_cache = NULL;
871 _pc_desc_cache.reset_to(scopes_pcs_begin());
872
873 // Copy contents of ScopeDescRecorder to nmethod
874 code_buffer->copy_values_to(this);
875 debug_info->copy_to(this);
876 dependencies->copy_to(this);
877 if (ScavengeRootsInCode) {
878 if (detect_scavenge_root_oops()) {
879 CodeCache::add_scavenge_root_nmethod(this);
880 }
881 Universe::heap()->register_nmethod(this);
882 }
883 debug_only(verify_scavenge_root_oops());
884
885 CodeCache::commit(this);
886
887 // Copy contents of ExceptionHandlerTable to nmethod
888 handler_table->copy_to(this);
889 nul_chk_table->copy_to(this);
890
891 // we use the information of entry points to find out if a method is
892 // static or non static
893 assert(compiler->is_c2() || compiler->is_jvmci() ||
894 _method->is_static() == (entry_point() == _verified_entry_point),
895 " entry points must be same for static methods and vice versa");
896 }
897 }
898
899 // Print a short set of xml attributes to identify this nmethod. The
900 // output should be embedded in some other element.
901 void nmethod::log_identity(xmlStream* log) const {
902 log->print(" compile_id='%d'", compile_id());
903 const char* nm_kind = compile_kind();
904 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind);
905 if (compiler() != NULL) {
906 log->print(" compiler='%s'", compiler()->name());
907 }
908 if (TieredCompilation) {
909 log->print(" level='%d'", comp_level());
910 }
911 }
912
913
914 #define LOG_OFFSET(log, name) \
915 if (p2i(name##_end()) - p2i(name##_begin())) \
916 log->print(" " XSTR(name) "_offset='" INTX_FORMAT "'" , \
917 p2i(name##_begin()) - p2i(this))
918
919
920 void nmethod::log_new_nmethod() const {
921 if (LogCompilation && xtty != NULL) {
922 ttyLocker ttyl;
923 HandleMark hm;
924 xtty->begin_elem("nmethod");
925 log_identity(xtty);
926 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size());
927 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this));
928
929 LOG_OFFSET(xtty, relocation);
930 LOG_OFFSET(xtty, consts);
931 LOG_OFFSET(xtty, insts);
932 LOG_OFFSET(xtty, stub);
933 LOG_OFFSET(xtty, scopes_data);
934 LOG_OFFSET(xtty, scopes_pcs);
935 LOG_OFFSET(xtty, dependencies);
936 LOG_OFFSET(xtty, handler_table);
937 LOG_OFFSET(xtty, nul_chk_table);
938 LOG_OFFSET(xtty, oops);
939 LOG_OFFSET(xtty, metadata);
940
941 xtty->method(method());
942 xtty->stamp();
943 xtty->end_elem();
944 }
945 }
946
947 #undef LOG_OFFSET
948
949
950 // Print out more verbose output usually for a newly created nmethod.
951 void nmethod::print_on(outputStream* st, const char* msg) const {
952 if (st != NULL) {
953 ttyLocker ttyl;
954 if (WizardMode) {
955 CompileTask::print(st, this, msg, /*short_form:*/ true);
956 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this));
957 } else {
958 CompileTask::print(st, this, msg, /*short_form:*/ false);
959 }
960 }
961 }
962
963
964 void nmethod::print_nmethod(bool printmethod) {
965 ttyLocker ttyl; // keep the following output all in one block
966 if (xtty != NULL) {
967 xtty->begin_head("print_nmethod");
968 xtty->stamp();
969 xtty->end_head();
970 }
971 // print the header part first
972 print();
973 // then print the requested information
974 if (printmethod) {
975 print_code();
976 print_pcs();
977 if (oop_maps()) {
978 oop_maps()->print();
979 }
980 }
981 if (printmethod || PrintDebugInfo || CompilerOracle::has_option_string(_method, "PrintDebugInfo")) {
982 print_scopes();
983 }
984 if (printmethod || PrintRelocations || CompilerOracle::has_option_string(_method, "PrintRelocations")) {
985 print_relocations();
986 }
987 if (printmethod || PrintDependencies || CompilerOracle::has_option_string(_method, "PrintDependencies")) {
988 print_dependencies();
989 }
990 if (printmethod || PrintExceptionHandlers) {
991 print_handler_table();
992 print_nul_chk_table();
993 }
994 if (printmethod) {
995 print_recorded_oops();
996 print_recorded_metadata();
997 }
998 if (xtty != NULL) {
999 xtty->tail("print_nmethod");
1000 }
1001 }
1002
1003
1004 // Promote one word from an assembly-time handle to a live embedded oop.
1005 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
1006 if (handle == NULL ||
1007 // As a special case, IC oops are initialized to 1 or -1.
1008 handle == (jobject) Universe::non_oop_word()) {
1009 (*dest) = (oop) handle;
1010 } else {
1011 (*dest) = JNIHandles::resolve_non_null(handle);
1012 }
1013 }
1014
1015
1016 // Have to have the same name because it's called by a template
1017 void nmethod::copy_values(GrowableArray<jobject>* array) {
1018 int length = array->length();
1019 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
1020 oop* dest = oops_begin();
1021 for (int index = 0 ; index < length; index++) {
1022 initialize_immediate_oop(&dest[index], array->at(index));
1023 }
1024
1025 // Now we can fix up all the oops in the code. We need to do this
1026 // in the code because the assembler uses jobjects as placeholders.
1027 // The code and relocations have already been initialized by the
1028 // CodeBlob constructor, so it is valid even at this early point to
1029 // iterate over relocations and patch the code.
1030 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true);
1031 }
1032
1033 void nmethod::copy_values(GrowableArray<Metadata*>* array) {
1034 int length = array->length();
1035 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough");
1036 Metadata** dest = metadata_begin();
1037 for (int index = 0 ; index < length; index++) {
1038 dest[index] = array->at(index);
1039 }
1040 }
1041
1042 bool nmethod::is_at_poll_return(address pc) {
1043 RelocIterator iter(this, pc, pc+1);
1044 while (iter.next()) {
1045 if (iter.type() == relocInfo::poll_return_type)
1046 return true;
1047 }
1048 return false;
1049 }
1050
1051
1052 bool nmethod::is_at_poll_or_poll_return(address pc) {
1053 RelocIterator iter(this, pc, pc+1);
1054 while (iter.next()) {
1055 relocInfo::relocType t = iter.type();
1056 if (t == relocInfo::poll_return_type || t == relocInfo::poll_type)
1057 return true;
1058 }
1059 return false;
1060 }
1061
1062
1063 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) {
1064 // re-patch all oop-bearing instructions, just in case some oops moved
1065 RelocIterator iter(this, begin, end);
1066 while (iter.next()) {
1067 if (iter.type() == relocInfo::oop_type) {
1068 oop_Relocation* reloc = iter.oop_reloc();
1069 if (initialize_immediates && reloc->oop_is_immediate()) {
1070 oop* dest = reloc->oop_addr();
1071 initialize_immediate_oop(dest, (jobject) *dest);
1072 }
1073 // Refresh the oop-related bits of this instruction.
1074 reloc->fix_oop_relocation();
1075 } else if (iter.type() == relocInfo::metadata_type) {
1076 metadata_Relocation* reloc = iter.metadata_reloc();
1077 reloc->fix_metadata_relocation();
1078 }
1079 }
1080 }
1081
1082
1083 void nmethod::verify_oop_relocations() {
1084 // Ensure sure that the code matches the current oop values
1085 RelocIterator iter(this, NULL, NULL);
1086 while (iter.next()) {
1087 if (iter.type() == relocInfo::oop_type) {
1088 oop_Relocation* reloc = iter.oop_reloc();
1089 if (!reloc->oop_is_immediate()) {
1090 reloc->verify_oop_relocation();
1091 }
1092 }
1093 }
1094 }
1095
1096
1097 ScopeDesc* nmethod::scope_desc_at(address pc) {
1098 PcDesc* pd = pc_desc_at(pc);
1099 guarantee(pd != NULL, "scope must be present");
1100 return new ScopeDesc(this, pd->scope_decode_offset(),
1101 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(),
1102 pd->return_oop());
1103 }
1104
1105
1106 void nmethod::clear_inline_caches() {
1107 assert(SafepointSynchronize::is_at_safepoint(), "cleaning of IC's only allowed at safepoint");
1108 if (is_zombie()) {
1109 return;
1110 }
1111
1112 RelocIterator iter(this);
1113 while (iter.next()) {
1114 iter.reloc()->clear_inline_cache();
1115 }
1116 }
1117
1118 // Clear ICStubs of all compiled ICs
1119 void nmethod::clear_ic_stubs() {
1120 assert_locked_or_safepoint(CompiledIC_lock);
1121 RelocIterator iter(this);
1122 while(iter.next()) {
1123 if (iter.type() == relocInfo::virtual_call_type) {
1124 CompiledIC* ic = CompiledIC_at(&iter);
1125 ic->clear_ic_stub();
1126 }
1127 }
1128 }
1129
1130
1131 void nmethod::cleanup_inline_caches() {
1132 assert_locked_or_safepoint(CompiledIC_lock);
1133
1134 // If the method is not entrant or zombie then a JMP is plastered over the
1135 // first few bytes. If an oop in the old code was there, that oop
1136 // should not get GC'd. Skip the first few bytes of oops on
1137 // not-entrant methods.
1138 address low_boundary = verified_entry_point();
1139 if (!is_in_use()) {
1140 low_boundary += NativeJump::instruction_size;
1141 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1142 // This means that the low_boundary is going to be a little too high.
1143 // This shouldn't matter, since oops of non-entrant methods are never used.
1144 // In fact, why are we bothering to look at oops in a non-entrant method??
1145 }
1146
1147 // Find all calls in an nmethod and clear the ones that point to non-entrant,
1148 // zombie and unloaded nmethods.
1149 ResourceMark rm;
1150 RelocIterator iter(this, low_boundary);
1151 while(iter.next()) {
1152 switch(iter.type()) {
1153 case relocInfo::virtual_call_type:
1154 case relocInfo::opt_virtual_call_type: {
1155 CompiledIC *ic = CompiledIC_at(&iter);
1156 // Ok, to lookup references to zombies here
1157 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
1158 if( cb != NULL && cb->is_nmethod() ) {
1159 nmethod* nm = (nmethod*)cb;
1160 // Clean inline caches pointing to zombie, non-entrant and unloaded methods
1161 if (!nm->is_in_use() || (nm->method()->code() != nm)) ic->set_to_clean(is_alive());
1162 }
1163 break;
1164 }
1165 case relocInfo::static_call_type: {
1166 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
1167 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
1168 if( cb != NULL && cb->is_nmethod() ) {
1169 nmethod* nm = (nmethod*)cb;
1170 // Clean inline caches pointing to zombie, non-entrant and unloaded methods
1171 if (!nm->is_in_use() || (nm->method()->code() != nm)) csc->set_to_clean();
1172 }
1173 break;
1174 }
1175 }
1176 }
1177 }
1178
1179 void nmethod::verify_clean_inline_caches() {
1180 assert_locked_or_safepoint(CompiledIC_lock);
1181
1182 // If the method is not entrant or zombie then a JMP is plastered over the
1183 // first few bytes. If an oop in the old code was there, that oop
1184 // should not get GC'd. Skip the first few bytes of oops on
1185 // not-entrant methods.
1186 address low_boundary = verified_entry_point();
1187 if (!is_in_use()) {
1188 low_boundary += NativeJump::instruction_size;
1189 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1190 // This means that the low_boundary is going to be a little too high.
1191 // This shouldn't matter, since oops of non-entrant methods are never used.
1192 // In fact, why are we bothering to look at oops in a non-entrant method??
1193 }
1194
1195 ResourceMark rm;
1196 RelocIterator iter(this, low_boundary);
1197 while(iter.next()) {
1198 switch(iter.type()) {
1199 case relocInfo::virtual_call_type:
1200 case relocInfo::opt_virtual_call_type: {
1201 CompiledIC *ic = CompiledIC_at(&iter);
1202 // Ok, to lookup references to zombies here
1203 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
1204 if( cb != NULL && cb->is_nmethod() ) {
1205 nmethod* nm = (nmethod*)cb;
1206 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
1207 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1208 assert(ic->is_clean(), "IC should be clean");
1209 }
1210 }
1211 break;
1212 }
1213 case relocInfo::static_call_type: {
1214 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
1215 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
1216 if( cb != NULL && cb->is_nmethod() ) {
1217 nmethod* nm = (nmethod*)cb;
1218 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
1219 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1220 assert(csc->is_clean(), "IC should be clean");
1221 }
1222 }
1223 break;
1224 }
1225 }
1226 }
1227 }
1228
1229 int nmethod::verify_icholder_relocations() {
1230 int count = 0;
1231
1232 RelocIterator iter(this);
1233 while(iter.next()) {
1234 if (iter.type() == relocInfo::virtual_call_type) {
1235 if (CompiledIC::is_icholder_call_site(iter.virtual_call_reloc())) {
1236 CompiledIC *ic = CompiledIC_at(&iter);
1237 if (TraceCompiledIC) {
1238 tty->print("noticed icholder " INTPTR_FORMAT " ", p2i(ic->cached_icholder()));
1239 ic->print();
1240 }
1241 assert(ic->cached_icholder() != NULL, "must be non-NULL");
1242 count++;
1243 }
1244 }
1245 }
1246
1247 return count;
1248 }
1249
1250 // This is a private interface with the sweeper.
1251 void nmethod::mark_as_seen_on_stack() {
1252 assert(is_alive(), "Must be an alive method");
1253 // Set the traversal mark to ensure that the sweeper does 2
1254 // cleaning passes before moving to zombie.
1255 set_stack_traversal_mark(NMethodSweeper::traversal_count());
1256 }
1257
1258 // Tell if a non-entrant method can be converted to a zombie (i.e.,
1259 // there are no activations on the stack, not in use by the VM,
1260 // and not in use by the ServiceThread)
1261 bool nmethod::can_convert_to_zombie() {
1262 assert(is_not_entrant(), "must be a non-entrant method");
1263
1264 // Since the nmethod sweeper only does partial sweep the sweeper's traversal
1265 // count can be greater than the stack traversal count before it hits the
1266 // nmethod for the second time.
1267 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count() &&
1268 !is_locked_by_vm();
1269 }
1270
1271 void nmethod::inc_decompile_count() {
1272 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return;
1273 // Could be gated by ProfileTraps, but do not bother...
1274 Method* m = method();
1275 if (m == NULL) return;
1276 MethodData* mdo = m->method_data();
1277 if (mdo == NULL) return;
1278 // There is a benign race here. See comments in methodData.hpp.
1279 mdo->inc_decompile_count();
1280 }
1281
1282 void nmethod::increase_unloading_clock() {
1283 _global_unloading_clock++;
1284 if (_global_unloading_clock == 0) {
1285 // _nmethods are allocated with _unloading_clock == 0,
1286 // so 0 is never used as a clock value.
1287 _global_unloading_clock = 1;
1288 }
1289 }
1290
1291 void nmethod::set_unloading_clock(unsigned char unloading_clock) {
1292 OrderAccess::release_store((volatile jubyte*)&_unloading_clock, unloading_clock);
1293 }
1294
1295 unsigned char nmethod::unloading_clock() {
1296 return (unsigned char)OrderAccess::load_acquire((volatile jubyte*)&_unloading_clock);
1297 }
1298
1299 void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) {
1300
1301 post_compiled_method_unload();
1302
1303 // Since this nmethod is being unloaded, make sure that dependencies
1304 // recorded in instanceKlasses get flushed and pass non-NULL closure to
1305 // indicate that this work is being done during a GC.
1306 assert(Universe::heap()->is_gc_active(), "should only be called during gc");
1307 assert(is_alive != NULL, "Should be non-NULL");
1308 // A non-NULL is_alive closure indicates that this is being called during GC.
1309 flush_dependencies(is_alive);
1310
1311 // Break cycle between nmethod & method
1312 if (TraceClassUnloading && WizardMode) {
1313 tty->print_cr("[Class unloading: Making nmethod " INTPTR_FORMAT
1314 " unloadable], Method*(" INTPTR_FORMAT
1315 "), cause(" INTPTR_FORMAT ")",
1316 p2i(this), p2i(_method), p2i(cause));
1317 if (!Universe::heap()->is_gc_active())
1318 cause->klass()->print();
1319 }
1320 // Unlink the osr method, so we do not look this up again
1321 if (is_osr_method()) {
1322 invalidate_osr_method();
1323 }
1324 // If _method is already NULL the Method* is about to be unloaded,
1325 // so we don't have to break the cycle. Note that it is possible to
1326 // have the Method* live here, in case we unload the nmethod because
1327 // it is pointing to some oop (other than the Method*) being unloaded.
1328 if (_method != NULL) {
1329 // OSR methods point to the Method*, but the Method* does not
1330 // point back!
1331 if (_method->code() == this) {
1332 _method->clear_code(); // Break a cycle
1333 }
1334 _method = NULL; // Clear the method of this dead nmethod
1335 }
1336
1337 // Make the class unloaded - i.e., change state and notify sweeper
1338 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
1339 if (is_in_use()) {
1340 // Transitioning directly from live to unloaded -- so
1341 // we need to force a cache clean-up; remember this
1342 // for later on.
1343 CodeCache::set_needs_cache_clean(true);
1344 }
1345
1346 // Unregister must be done before the state change
1347 Universe::heap()->unregister_nmethod(this);
1348
1349 _state = unloaded;
1350
1351 #if INCLUDE_JVMCI
1352 // The method can only be unloaded after the pointer to the installed code
1353 // Java wrapper is no longer alive. Here we need to clear out this weak
1354 // reference to the dead object. Nulling out the reference has to happen
1355 // after the method is unregistered since the original value may be still
1356 // tracked by the rset.
1357 maybe_invalidate_installed_code();
1358 #endif
1359
1360 // Log the unloading.
1361 log_state_change();
1362
1363 // The Method* is gone at this point
1364 assert(_method == NULL, "Tautology");
1365
1366 set_osr_link(NULL);
1367 //set_scavenge_root_link(NULL); // done by prune_scavenge_root_nmethods
1368 NMethodSweeper::report_state_change(this);
1369 }
1370
1371 void nmethod::invalidate_osr_method() {
1372 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
1373 // Remove from list of active nmethods
1374 if (method() != NULL)
1375 method()->method_holder()->remove_osr_nmethod(this);
1376 }
1377
1378 void nmethod::log_state_change() const {
1379 if (LogCompilation) {
1380 if (xtty != NULL) {
1381 ttyLocker ttyl; // keep the following output all in one block
1382 if (_state == unloaded) {
1383 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'",
1384 os::current_thread_id());
1385 } else {
1386 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s",
1387 os::current_thread_id(),
1388 (_state == zombie ? " zombie='1'" : ""));
1389 }
1390 log_identity(xtty);
1391 xtty->stamp();
1392 xtty->end_elem();
1393 }
1394 }
1395 if (PrintCompilation && _state != unloaded) {
1396 print_on(tty, _state == zombie ? "made zombie" : "made not entrant");
1397 }
1398 }
1399
1400 /**
1401 * Common functionality for both make_not_entrant and make_zombie
1402 */
1403 bool nmethod::make_not_entrant_or_zombie(unsigned int state) {
1404 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant");
1405 assert(!is_zombie(), "should not already be a zombie");
1406
1407 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below.
1408 nmethodLocker nml(this);
1409 methodHandle the_method(method());
1410 No_Safepoint_Verifier nsv;
1411
1412 // during patching, depending on the nmethod state we must notify the GC that
1413 // code has been unloaded, unregistering it. We cannot do this right while
1414 // holding the Patching_lock because we need to use the CodeCache_lock. This
1415 // would be prone to deadlocks.
1416 // This flag is used to remember whether we need to later lock and unregister.
1417 bool nmethod_needs_unregister = false;
1418
1419 {
1420 // invalidate osr nmethod before acquiring the patching lock since
1421 // they both acquire leaf locks and we don't want a deadlock.
1422 // This logic is equivalent to the logic below for patching the
1423 // verified entry point of regular methods.
1424 if (is_osr_method()) {
1425 // this effectively makes the osr nmethod not entrant
1426 invalidate_osr_method();
1427 }
1428
1429 // Enter critical section. Does not block for safepoint.
1430 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1431
1432 if (_state == state) {
1433 // another thread already performed this transition so nothing
1434 // to do, but return false to indicate this.
1435 return false;
1436 }
1437
1438 // The caller can be calling the method statically or through an inline
1439 // cache call.
1440 if (!is_osr_method() && !is_not_entrant()) {
1441 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
1442 SharedRuntime::get_handle_wrong_method_stub());
1443 }
1444
1445 if (is_in_use()) {
1446 // It's a true state change, so mark the method as decompiled.
1447 // Do it only for transition from alive.
1448 inc_decompile_count();
1449 }
1450
1451 // If the state is becoming a zombie, signal to unregister the nmethod with
1452 // the heap.
1453 // This nmethod may have already been unloaded during a full GC.
1454 if ((state == zombie) && !is_unloaded()) {
1455 nmethod_needs_unregister = true;
1456 }
1457
1458 // Must happen before state change. Otherwise we have a race condition in
1459 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately
1460 // transition its state from 'not_entrant' to 'zombie' without having to wait
1461 // for stack scanning.
1462 if (state == not_entrant) {
1463 mark_as_seen_on_stack();
1464 OrderAccess::storestore();
1465 }
1466
1467 // Change state
1468 _state = state;
1469
1470 // Log the transition once
1471 log_state_change();
1472
1473 // Remove nmethod from method.
1474 // We need to check if both the _code and _from_compiled_code_entry_point
1475 // refer to this nmethod because there is a race in setting these two fields
1476 // in Method* as seen in bugid 4947125.
1477 // If the vep() points to the zombie nmethod, the memory for the nmethod
1478 // could be flushed and the compiler and vtable stubs could still call
1479 // through it.
1480 if (method() != NULL && (method()->code() == this ||
1481 method()->from_compiled_entry() == verified_entry_point())) {
1482 HandleMark hm;
1483 method()->clear_code();
1484 }
1485 } // leave critical region under Patching_lock
1486
1487 // When the nmethod becomes zombie it is no longer alive so the
1488 // dependencies must be flushed. nmethods in the not_entrant
1489 // state will be flushed later when the transition to zombie
1490 // happens or they get unloaded.
1491 if (state == zombie) {
1492 {
1493 // Flushing dependecies must be done before any possible
1494 // safepoint can sneak in, otherwise the oops used by the
1495 // dependency logic could have become stale.
1496 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1497 if (nmethod_needs_unregister) {
1498 Universe::heap()->unregister_nmethod(this);
1499 }
1500 flush_dependencies(NULL);
1501 }
1502
1503 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload
1504 // event and it hasn't already been reported for this nmethod then
1505 // report it now. The event may have been reported earilier if the GC
1506 // marked it for unloading). JvmtiDeferredEventQueue support means
1507 // we no longer go to a safepoint here.
1508 post_compiled_method_unload();
1509
1510 #ifdef ASSERT
1511 // It's no longer safe to access the oops section since zombie
1512 // nmethods aren't scanned for GC.
1513 _oops_are_stale = true;
1514 #endif
1515 // the Method may be reclaimed by class unloading now that the
1516 // nmethod is in zombie state
1517 set_method(NULL);
1518 } else {
1519 assert(state == not_entrant, "other cases may need to be handled differently");
1520 }
1521
1522 JVMCI_ONLY(maybe_invalidate_installed_code());
1523
1524 if (TraceCreateZombies) {
1525 ResourceMark m;
1526 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");
1527 }
1528
1529 NMethodSweeper::report_state_change(this);
1530 return true;
1531 }
1532
1533 void nmethod::flush() {
1534 // Note that there are no valid oops in the nmethod anymore.
1535 assert(is_zombie() || (is_osr_method() && is_unloaded()), "must be a zombie method");
1536 assert(is_marked_for_reclamation() || (is_osr_method() && is_unloaded()), "must be marked for reclamation");
1537
1538 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed");
1539 assert_locked_or_safepoint(CodeCache_lock);
1540
1541 // completely deallocate this method
1542 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, p2i(this));
1543 if (PrintMethodFlushing) {
1544 tty->print_cr("*flushing nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT
1545 "/Free CodeCache:" SIZE_FORMAT "Kb",
1546 _compile_id, p2i(this), CodeCache::blob_count(),
1547 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024);
1548 }
1549
1550 // We need to deallocate any ExceptionCache data.
1551 // Note that we do not need to grab the nmethod lock for this, it
1552 // better be thread safe if we're disposing of it!
1553 ExceptionCache* ec = exception_cache();
1554 set_exception_cache(NULL);
1555 while(ec != NULL) {
1556 ExceptionCache* next = ec->next();
1557 delete ec;
1558 ec = next;
1559 }
1560
1561 if (on_scavenge_root_list()) {
1562 CodeCache::drop_scavenge_root_nmethod(this);
1563 }
1564
1565 #ifdef SHARK
1566 ((SharkCompiler *) compiler())->free_compiled_method(insts_begin());
1567 #endif // SHARK
1568
1569 ((CodeBlob*)(this))->flush();
1570
1571 CodeCache::free(this);
1572 }
1573
1574 //
1575 // Notify all classes this nmethod is dependent on that it is no
1576 // longer dependent. This should only be called in two situations.
1577 // First, when a nmethod transitions to a zombie all dependents need
1578 // to be clear. Since zombification happens at a safepoint there's no
1579 // synchronization issues. The second place is a little more tricky.
1580 // During phase 1 of mark sweep class unloading may happen and as a
1581 // result some nmethods may get unloaded. In this case the flushing
1582 // of dependencies must happen during phase 1 since after GC any
1583 // dependencies in the unloaded nmethod won't be updated, so
1584 // traversing the dependency information in unsafe. In that case this
1585 // function is called with a non-NULL argument and this function only
1586 // notifies instanceKlasses that are reachable
1587
1588 void nmethod::flush_dependencies(BoolObjectClosure* is_alive) {
1589 assert_locked_or_safepoint(CodeCache_lock);
1590 assert(Universe::heap()->is_gc_active() == (is_alive != NULL),
1591 "is_alive is non-NULL if and only if we are called during GC");
1592 if (!has_flushed_dependencies()) {
1593 set_has_flushed_dependencies();
1594 for (Dependencies::DepStream deps(this); deps.next(); ) {
1595 if (deps.type() == Dependencies::call_site_target_value) {
1596 // CallSite dependencies are managed on per-CallSite instance basis.
1597 oop call_site = deps.argument_oop(0);
1598 MethodHandles::remove_dependent_nmethod(call_site, this);
1599 } else {
1600 Klass* klass = deps.context_type();
1601 if (klass == NULL) {
1602 continue; // ignore things like evol_method
1603 }
1604 // During GC the is_alive closure is non-NULL, and is used to
1605 // determine liveness of dependees that need to be updated.
1606 if (is_alive == NULL || klass->is_loader_alive(is_alive)) {
1607 // The GC defers deletion of this entry, since there might be multiple threads
1608 // iterating over the _dependencies graph. Other call paths are single-threaded
1609 // and may delete it immediately.
1610 bool delete_immediately = is_alive == NULL;
1611 InstanceKlass::cast(klass)->remove_dependent_nmethod(this, delete_immediately);
1612 }
1613 }
1614 }
1615 }
1616 }
1617
1618
1619 // If this oop is not live, the nmethod can be unloaded.
1620 bool nmethod::can_unload(BoolObjectClosure* is_alive, oop* root, bool unloading_occurred) {
1621 assert(root != NULL, "just checking");
1622 oop obj = *root;
1623 if (obj == NULL || is_alive->do_object_b(obj)) {
1624 return false;
1625 }
1626
1627 // If ScavengeRootsInCode is true, an nmethod might be unloaded
1628 // simply because one of its constant oops has gone dead.
1629 // No actual classes need to be unloaded in order for this to occur.
1630 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading");
1631 make_unloaded(is_alive, obj);
1632 return true;
1633 }
1634
1635 // ------------------------------------------------------------------
1636 // post_compiled_method_load_event
1637 // new method for install_code() path
1638 // Transfer information from compilation to jvmti
1639 void nmethod::post_compiled_method_load_event() {
1640
1641 Method* moop = method();
1642 HOTSPOT_COMPILED_METHOD_LOAD(
1643 (char *) moop->klass_name()->bytes(),
1644 moop->klass_name()->utf8_length(),
1645 (char *) moop->name()->bytes(),
1646 moop->name()->utf8_length(),
1647 (char *) moop->signature()->bytes(),
1648 moop->signature()->utf8_length(),
1649 insts_begin(), insts_size());
1650
1651 if (JvmtiExport::should_post_compiled_method_load() ||
1652 JvmtiExport::should_post_compiled_method_unload()) {
1653 get_and_cache_jmethod_id();
1654 }
1655
1656 if (JvmtiExport::should_post_compiled_method_load()) {
1657 // Let the Service thread (which is a real Java thread) post the event
1658 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1659 JvmtiDeferredEventQueue::enqueue(
1660 JvmtiDeferredEvent::compiled_method_load_event(this));
1661 }
1662 }
1663
1664 jmethodID nmethod::get_and_cache_jmethod_id() {
1665 if (_jmethod_id == NULL) {
1666 // Cache the jmethod_id since it can no longer be looked up once the
1667 // method itself has been marked for unloading.
1668 _jmethod_id = method()->jmethod_id();
1669 }
1670 return _jmethod_id;
1671 }
1672
1673 void nmethod::post_compiled_method_unload() {
1674 if (unload_reported()) {
1675 // During unloading we transition to unloaded and then to zombie
1676 // and the unloading is reported during the first transition.
1677 return;
1678 }
1679
1680 assert(_method != NULL && !is_unloaded(), "just checking");
1681 DTRACE_METHOD_UNLOAD_PROBE(method());
1682
1683 // If a JVMTI agent has enabled the CompiledMethodUnload event then
1684 // post the event. Sometime later this nmethod will be made a zombie
1685 // by the sweeper but the Method* will not be valid at that point.
1686 // If the _jmethod_id is null then no load event was ever requested
1687 // so don't bother posting the unload. The main reason for this is
1688 // that the jmethodID is a weak reference to the Method* so if
1689 // it's being unloaded there's no way to look it up since the weak
1690 // ref will have been cleared.
1691 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) {
1692 assert(!unload_reported(), "already unloaded");
1693 JvmtiDeferredEvent event =
1694 JvmtiDeferredEvent::compiled_method_unload_event(this,
1695 _jmethod_id, insts_begin());
1696 if (SafepointSynchronize::is_at_safepoint()) {
1697 // Don't want to take the queueing lock. Add it as pending and
1698 // it will get enqueued later.
1699 JvmtiDeferredEventQueue::add_pending_event(event);
1700 } else {
1701 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1702 JvmtiDeferredEventQueue::enqueue(event);
1703 }
1704 }
1705
1706 // The JVMTI CompiledMethodUnload event can be enabled or disabled at
1707 // any time. As the nmethod is being unloaded now we mark it has
1708 // having the unload event reported - this will ensure that we don't
1709 // attempt to report the event in the unlikely scenario where the
1710 // event is enabled at the time the nmethod is made a zombie.
1711 set_unload_reported();
1712 }
1713
1714 void static clean_ic_if_metadata_is_dead(CompiledIC *ic, BoolObjectClosure *is_alive) {
1715 if (ic->is_icholder_call()) {
1716 // The only exception is compiledICHolder oops which may
1717 // yet be marked below. (We check this further below).
1718 CompiledICHolder* cichk_oop = ic->cached_icholder();
1719
1720 if (cichk_oop->holder_method()->method_holder()->is_loader_alive(is_alive) &&
1721 cichk_oop->holder_klass()->is_loader_alive(is_alive)) {
1722 return;
1723 }
1724 } else {
1725 Metadata* ic_oop = ic->cached_metadata();
1726 if (ic_oop != NULL) {
1727 if (ic_oop->is_klass()) {
1728 if (((Klass*)ic_oop)->is_loader_alive(is_alive)) {
1729 return;
1730 }
1731 } else if (ic_oop->is_method()) {
1732 if (((Method*)ic_oop)->method_holder()->is_loader_alive(is_alive)) {
1733 return;
1734 }
1735 } else {
1736 ShouldNotReachHere();
1737 }
1738 }
1739 }
1740
1741 ic->set_to_clean();
1742 }
1743
1744 // This is called at the end of the strong tracing/marking phase of a
1745 // GC to unload an nmethod if it contains otherwise unreachable
1746 // oops.
1747
1748 void nmethod::do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred) {
1749 // Make sure the oop's ready to receive visitors
1750 assert(!is_zombie() && !is_unloaded(),
1751 "should not call follow on zombie or unloaded nmethod");
1752
1753 // If the method is not entrant then a JMP is plastered over the
1754 // first few bytes. If an oop in the old code was there, that oop
1755 // should not get GC'd. Skip the first few bytes of oops on
1756 // not-entrant methods.
1757 address low_boundary = verified_entry_point();
1758 if (is_not_entrant()) {
1759 low_boundary += NativeJump::instruction_size;
1760 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1761 // (See comment above.)
1762 }
1763
1764 // The RedefineClasses() API can cause the class unloading invariant
1765 // to no longer be true. See jvmtiExport.hpp for details.
1766 // Also, leave a debugging breadcrumb in local flag.
1767 if (JvmtiExport::has_redefined_a_class()) {
1768 // This set of the unloading_occurred flag is done before the
1769 // call to post_compiled_method_unload() so that the unloading
1770 // of this nmethod is reported.
1771 unloading_occurred = true;
1772 }
1773
1774 // Exception cache
1775 clean_exception_cache(is_alive);
1776
1777 // If class unloading occurred we first iterate over all inline caches and
1778 // clear ICs where the cached oop is referring to an unloaded klass or method.
1779 // The remaining live cached oops will be traversed in the relocInfo::oop_type
1780 // iteration below.
1781 if (unloading_occurred) {
1782 RelocIterator iter(this, low_boundary);
1783 while(iter.next()) {
1784 if (iter.type() == relocInfo::virtual_call_type) {
1785 CompiledIC *ic = CompiledIC_at(&iter);
1786 clean_ic_if_metadata_is_dead(ic, is_alive);
1787 }
1788 }
1789 }
1790
1791 // Compiled code
1792 {
1793 RelocIterator iter(this, low_boundary);
1794 while (iter.next()) {
1795 if (iter.type() == relocInfo::oop_type) {
1796 oop_Relocation* r = iter.oop_reloc();
1797 // In this loop, we must only traverse those oops directly embedded in
1798 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1799 assert(1 == (r->oop_is_immediate()) +
1800 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1801 "oop must be found in exactly one place");
1802 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1803 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) {
1804 return;
1805 }
1806 }
1807 }
1808 }
1809 }
1810
1811
1812 // Scopes
1813 for (oop* p = oops_begin(); p < oops_end(); p++) {
1814 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1815 if (can_unload(is_alive, p, unloading_occurred)) {
1816 return;
1817 }
1818 }
1819
1820 #if INCLUDE_JVMCI
1821 // Follow JVMCI method
1822 BarrierSet* bs = Universe::heap()->barrier_set();
1823 if (_jvmci_installed_code != NULL) {
1824 if (_jvmci_installed_code->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(_jvmci_installed_code)) {
1825 if (!is_alive->do_object_b(_jvmci_installed_code)) {
1826 clear_jvmci_installed_code();
1827 }
1828 } else {
1829 if (can_unload(is_alive, (oop*)&_jvmci_installed_code, unloading_occurred)) {
1830 return;
1831 }
1832 }
1833 }
1834
1835 if (_speculation_log != NULL) {
1836 if (!is_alive->do_object_b(_speculation_log)) {
1837 bs->write_ref_nmethod_pre(&_speculation_log, this);
1838 _speculation_log = NULL;
1839 bs->write_ref_nmethod_post(&_speculation_log, this);
1840 }
1841 }
1842 #endif
1843
1844
1845 // Ensure that all metadata is still alive
1846 verify_metadata_loaders(low_boundary, is_alive);
1847 }
1848
1849 template <class CompiledICorStaticCall>
1850 static bool clean_if_nmethod_is_unloaded(CompiledICorStaticCall *ic, address addr, BoolObjectClosure *is_alive, nmethod* from) {
1851 // Ok, to lookup references to zombies here
1852 CodeBlob *cb = CodeCache::find_blob_unsafe(addr);
1853 if (cb != NULL && cb->is_nmethod()) {
1854 nmethod* nm = (nmethod*)cb;
1855
1856 if (nm->unloading_clock() != nmethod::global_unloading_clock()) {
1857 // The nmethod has not been processed yet.
1858 return true;
1859 }
1860
1861 // Clean inline caches pointing to both zombie and not_entrant methods
1862 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1863 ic->set_to_clean();
1864 assert(ic->is_clean(), "nmethod " PTR_FORMAT "not clean %s", p2i(from), from->method()->name_and_sig_as_C_string());
1865 }
1866 }
1867
1868 return false;
1869 }
1870
1871 static bool clean_if_nmethod_is_unloaded(CompiledIC *ic, BoolObjectClosure *is_alive, nmethod* from) {
1872 return clean_if_nmethod_is_unloaded(ic, ic->ic_destination(), is_alive, from);
1873 }
1874
1875 static bool clean_if_nmethod_is_unloaded(CompiledStaticCall *csc, BoolObjectClosure *is_alive, nmethod* from) {
1876 return clean_if_nmethod_is_unloaded(csc, csc->destination(), is_alive, from);
1877 }
1878
1879 bool nmethod::unload_if_dead_at(RelocIterator* iter_at_oop, BoolObjectClosure *is_alive, bool unloading_occurred) {
1880 assert(iter_at_oop->type() == relocInfo::oop_type, "Wrong relocation type");
1881
1882 oop_Relocation* r = iter_at_oop->oop_reloc();
1883 // Traverse those oops directly embedded in the code.
1884 // Other oops (oop_index>0) are seen as part of scopes_oops.
1885 assert(1 == (r->oop_is_immediate()) +
1886 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1887 "oop must be found in exactly one place");
1888 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1889 // Unload this nmethod if the oop is dead.
1890 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) {
1891 return true;;
1892 }
1893 }
1894
1895 return false;
1896 }
1897
1898
1899 bool nmethod::do_unloading_parallel(BoolObjectClosure* is_alive, bool unloading_occurred) {
1900 ResourceMark rm;
1901
1902 // Make sure the oop's ready to receive visitors
1903 assert(!is_zombie() && !is_unloaded(),
1904 "should not call follow on zombie or unloaded nmethod");
1905
1906 // If the method is not entrant then a JMP is plastered over the
1907 // first few bytes. If an oop in the old code was there, that oop
1908 // should not get GC'd. Skip the first few bytes of oops on
1909 // not-entrant methods.
1910 address low_boundary = verified_entry_point();
1911 if (is_not_entrant()) {
1912 low_boundary += NativeJump::instruction_size;
1913 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1914 // (See comment above.)
1915 }
1916
1917 // The RedefineClasses() API can cause the class unloading invariant
1918 // to no longer be true. See jvmtiExport.hpp for details.
1919 // Also, leave a debugging breadcrumb in local flag.
1920 if (JvmtiExport::has_redefined_a_class()) {
1921 // This set of the unloading_occurred flag is done before the
1922 // call to post_compiled_method_unload() so that the unloading
1923 // of this nmethod is reported.
1924 unloading_occurred = true;
1925 }
1926
1927 // Exception cache
1928 clean_exception_cache(is_alive);
1929
1930 bool is_unloaded = false;
1931 bool postponed = false;
1932
1933 RelocIterator iter(this, low_boundary);
1934 while(iter.next()) {
1935
1936 switch (iter.type()) {
1937
1938 case relocInfo::virtual_call_type:
1939 if (unloading_occurred) {
1940 // If class unloading occurred we first iterate over all inline caches and
1941 // clear ICs where the cached oop is referring to an unloaded klass or method.
1942 clean_ic_if_metadata_is_dead(CompiledIC_at(&iter), is_alive);
1943 }
1944
1945 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
1946 break;
1947
1948 case relocInfo::opt_virtual_call_type:
1949 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
1950 break;
1951
1952 case relocInfo::static_call_type:
1953 postponed |= clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this);
1954 break;
1955
1956 case relocInfo::oop_type:
1957 if (!is_unloaded) {
1958 is_unloaded = unload_if_dead_at(&iter, is_alive, unloading_occurred);
1959 }
1960 break;
1961
1962 case relocInfo::metadata_type:
1963 break; // nothing to do.
1964 }
1965 }
1966
1967 if (is_unloaded) {
1968 return postponed;
1969 }
1970
1971 // Scopes
1972 for (oop* p = oops_begin(); p < oops_end(); p++) {
1973 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1974 if (can_unload(is_alive, p, unloading_occurred)) {
1975 is_unloaded = true;
1976 break;
1977 }
1978 }
1979
1980 if (is_unloaded) {
1981 return postponed;
1982 }
1983
1984 #if INCLUDE_JVMCI
1985 // Follow JVMCI method
1986 BarrierSet* bs = Universe::heap()->barrier_set();
1987 if (_jvmci_installed_code != NULL) {
1988 if (_jvmci_installed_code->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(_jvmci_installed_code)) {
1989 if (!is_alive->do_object_b(_jvmci_installed_code)) {
1990 clear_jvmci_installed_code();
1991 }
1992 } else {
1993 if (can_unload(is_alive, (oop*)&_jvmci_installed_code, unloading_occurred)) {
1994 is_unloaded = true;
1995 }
1996 }
1997 }
1998
1999 if (_speculation_log != NULL) {
2000 if (!is_alive->do_object_b(_speculation_log)) {
2001 bs->write_ref_nmethod_pre(&_speculation_log, this);
2002 _speculation_log = NULL;
2003 bs->write_ref_nmethod_post(&_speculation_log, this);
2004 }
2005 }
2006 #endif
2007
2008 // Ensure that all metadata is still alive
2009 verify_metadata_loaders(low_boundary, is_alive);
2010
2011 return postponed;
2012 }
2013
2014 void nmethod::do_unloading_parallel_postponed(BoolObjectClosure* is_alive, bool unloading_occurred) {
2015 ResourceMark rm;
2016
2017 // Make sure the oop's ready to receive visitors
2018 assert(!is_zombie(),
2019 "should not call follow on zombie nmethod");
2020
2021 // If the method is not entrant then a JMP is plastered over the
2022 // first few bytes. If an oop in the old code was there, that oop
2023 // should not get GC'd. Skip the first few bytes of oops on
2024 // not-entrant methods.
2025 address low_boundary = verified_entry_point();
2026 if (is_not_entrant()) {
2027 low_boundary += NativeJump::instruction_size;
2028 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
2029 // (See comment above.)
2030 }
2031
2032 RelocIterator iter(this, low_boundary);
2033 while(iter.next()) {
2034
2035 switch (iter.type()) {
2036
2037 case relocInfo::virtual_call_type:
2038 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
2039 break;
2040
2041 case relocInfo::opt_virtual_call_type:
2042 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
2043 break;
2044
2045 case relocInfo::static_call_type:
2046 clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this);
2047 break;
2048 }
2049 }
2050 }
2051
2052 #ifdef ASSERT
2053
2054 class CheckClass : AllStatic {
2055 static BoolObjectClosure* _is_alive;
2056
2057 // Check class_loader is alive for this bit of metadata.
2058 static void check_class(Metadata* md) {
2059 Klass* klass = NULL;
2060 if (md->is_klass()) {
2061 klass = ((Klass*)md);
2062 } else if (md->is_method()) {
2063 klass = ((Method*)md)->method_holder();
2064 } else if (md->is_methodData()) {
2065 klass = ((MethodData*)md)->method()->method_holder();
2066 } else {
2067 md->print();
2068 ShouldNotReachHere();
2069 }
2070 assert(klass->is_loader_alive(_is_alive), "must be alive");
2071 }
2072 public:
2073 static void do_check_class(BoolObjectClosure* is_alive, nmethod* nm) {
2074 assert(SafepointSynchronize::is_at_safepoint(), "this is only ok at safepoint");
2075 _is_alive = is_alive;
2076 nm->metadata_do(check_class);
2077 }
2078 };
2079
2080 // This is called during a safepoint so can use static data
2081 BoolObjectClosure* CheckClass::_is_alive = NULL;
2082 #endif // ASSERT
2083
2084
2085 // Processing of oop references should have been sufficient to keep
2086 // all strong references alive. Any weak references should have been
2087 // cleared as well. Visit all the metadata and ensure that it's
2088 // really alive.
2089 void nmethod::verify_metadata_loaders(address low_boundary, BoolObjectClosure* is_alive) {
2090 #ifdef ASSERT
2091 RelocIterator iter(this, low_boundary);
2092 while (iter.next()) {
2093 // static_stub_Relocations may have dangling references to
2094 // Method*s so trim them out here. Otherwise it looks like
2095 // compiled code is maintaining a link to dead metadata.
2096 address static_call_addr = NULL;
2097 if (iter.type() == relocInfo::opt_virtual_call_type) {
2098 CompiledIC* cic = CompiledIC_at(&iter);
2099 if (!cic->is_call_to_interpreted()) {
2100 static_call_addr = iter.addr();
2101 }
2102 } else if (iter.type() == relocInfo::static_call_type) {
2103 CompiledStaticCall* csc = compiledStaticCall_at(iter.reloc());
2104 if (!csc->is_call_to_interpreted()) {
2105 static_call_addr = iter.addr();
2106 }
2107 }
2108 if (static_call_addr != NULL) {
2109 RelocIterator sciter(this, low_boundary);
2110 while (sciter.next()) {
2111 if (sciter.type() == relocInfo::static_stub_type &&
2112 sciter.static_stub_reloc()->static_call() == static_call_addr) {
2113 sciter.static_stub_reloc()->clear_inline_cache();
2114 }
2115 }
2116 }
2117 }
2118 // Check that the metadata embedded in the nmethod is alive
2119 CheckClass::do_check_class(is_alive, this);
2120 #endif
2121 }
2122
2123
2124 // Iterate over metadata calling this function. Used by RedefineClasses
2125 void nmethod::metadata_do(void f(Metadata*)) {
2126 address low_boundary = verified_entry_point();
2127 if (is_not_entrant()) {
2128 low_boundary += NativeJump::instruction_size;
2129 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
2130 // (See comment above.)
2131 }
2132 {
2133 // Visit all immediate references that are embedded in the instruction stream.
2134 RelocIterator iter(this, low_boundary);
2135 while (iter.next()) {
2136 if (iter.type() == relocInfo::metadata_type ) {
2137 metadata_Relocation* r = iter.metadata_reloc();
2138 // In this metadata, we must only follow those metadatas directly embedded in
2139 // the code. Other metadatas (oop_index>0) are seen as part of
2140 // the metadata section below.
2141 assert(1 == (r->metadata_is_immediate()) +
2142 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
2143 "metadata must be found in exactly one place");
2144 if (r->metadata_is_immediate() && r->metadata_value() != NULL) {
2145 Metadata* md = r->metadata_value();
2146 if (md != _method) f(md);
2147 }
2148 } else if (iter.type() == relocInfo::virtual_call_type) {
2149 // Check compiledIC holders associated with this nmethod
2150 CompiledIC *ic = CompiledIC_at(&iter);
2151 if (ic->is_icholder_call()) {
2152 CompiledICHolder* cichk = ic->cached_icholder();
2153 f(cichk->holder_method());
2154 f(cichk->holder_klass());
2155 } else {
2156 Metadata* ic_oop = ic->cached_metadata();
2157 if (ic_oop != NULL) {
2158 f(ic_oop);
2159 }
2160 }
2161 }
2162 }
2163 }
2164
2165 // Visit the metadata section
2166 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
2167 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops
2168 Metadata* md = *p;
2169 f(md);
2170 }
2171
2172 // Visit metadata not embedded in the other places.
2173 if (_method != NULL) f(_method);
2174 }
2175
2176 void nmethod::oops_do(OopClosure* f, bool allow_zombie) {
2177 // make sure the oops ready to receive visitors
2178 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod");
2179 assert(!is_unloaded(), "should not call follow on unloaded nmethod");
2180
2181 // If the method is not entrant or zombie then a JMP is plastered over the
2182 // first few bytes. If an oop in the old code was there, that oop
2183 // should not get GC'd. Skip the first few bytes of oops on
2184 // not-entrant methods.
2185 address low_boundary = verified_entry_point();
2186 if (is_not_entrant()) {
2187 low_boundary += NativeJump::instruction_size;
2188 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
2189 // (See comment above.)
2190 }
2191
2192 #if INCLUDE_JVMCI
2193 if (_jvmci_installed_code != NULL) {
2194 f->do_oop((oop*) &_jvmci_installed_code);
2195 }
2196 if (_speculation_log != NULL) {
2197 f->do_oop((oop*) &_speculation_log);
2198 }
2199 #endif
2200
2201 RelocIterator iter(this, low_boundary);
2202
2203 while (iter.next()) {
2204 if (iter.type() == relocInfo::oop_type ) {
2205 oop_Relocation* r = iter.oop_reloc();
2206 // In this loop, we must only follow those oops directly embedded in
2207 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
2208 assert(1 == (r->oop_is_immediate()) +
2209 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
2210 "oop must be found in exactly one place");
2211 if (r->oop_is_immediate() && r->oop_value() != NULL) {
2212 f->do_oop(r->oop_addr());
2213 }
2214 }
2215 }
2216
2217 // Scopes
2218 // This includes oop constants not inlined in the code stream.
2219 for (oop* p = oops_begin(); p < oops_end(); p++) {
2220 if (*p == Universe::non_oop_word()) continue; // skip non-oops
2221 f->do_oop(p);
2222 }
2223 }
2224
2225 #define NMETHOD_SENTINEL ((nmethod*)badAddress)
2226
2227 nmethod* volatile nmethod::_oops_do_mark_nmethods;
2228
2229 // An nmethod is "marked" if its _mark_link is set non-null.
2230 // Even if it is the end of the linked list, it will have a non-null link value,
2231 // as long as it is on the list.
2232 // This code must be MP safe, because it is used from parallel GC passes.
2233 bool nmethod::test_set_oops_do_mark() {
2234 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");
2235 nmethod* observed_mark_link = _oops_do_mark_link;
2236 if (observed_mark_link == NULL) {
2237 // Claim this nmethod for this thread to mark.
2238 observed_mark_link = (nmethod*)
2239 Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_link, NULL);
2240 if (observed_mark_link == NULL) {
2241
2242 // Atomically append this nmethod (now claimed) to the head of the list:
2243 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods;
2244 for (;;) {
2245 nmethod* required_mark_nmethods = observed_mark_nmethods;
2246 _oops_do_mark_link = required_mark_nmethods;
2247 observed_mark_nmethods = (nmethod*)
2248 Atomic::cmpxchg_ptr(this, &_oops_do_mark_nmethods, required_mark_nmethods);
2249 if (observed_mark_nmethods == required_mark_nmethods)
2250 break;
2251 }
2252 // Mark was clear when we first saw this guy.
2253 if (TraceScavenge) { print_on(tty, "oops_do, mark"); }
2254 return false;
2255 }
2256 }
2257 // On fall through, another racing thread marked this nmethod before we did.
2258 return true;
2259 }
2260
2261 void nmethod::oops_do_marking_prologue() {
2262 if (TraceScavenge) { tty->print_cr("[oops_do_marking_prologue"); }
2263 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row");
2264 // We use cmpxchg_ptr instead of regular assignment here because the user
2265 // may fork a bunch of threads, and we need them all to see the same state.
2266 void* observed = Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, NULL);
2267 guarantee(observed == NULL, "no races in this sequential code");
2268 }
2269
2270 void nmethod::oops_do_marking_epilogue() {
2271 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row");
2272 nmethod* cur = _oops_do_mark_nmethods;
2273 while (cur != NMETHOD_SENTINEL) {
2274 assert(cur != NULL, "not NULL-terminated");
2275 nmethod* next = cur->_oops_do_mark_link;
2276 cur->_oops_do_mark_link = NULL;
2277 DEBUG_ONLY(cur->verify_oop_relocations());
2278 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark"));
2279 cur = next;
2280 }
2281 void* required = _oops_do_mark_nmethods;
2282 void* observed = Atomic::cmpxchg_ptr(NULL, &_oops_do_mark_nmethods, required);
2283 guarantee(observed == required, "no races in this sequential code");
2284 if (TraceScavenge) { tty->print_cr("oops_do_marking_epilogue]"); }
2285 }
2286
2287 class DetectScavengeRoot: public OopClosure {
2288 bool _detected_scavenge_root;
2289 public:
2290 DetectScavengeRoot() : _detected_scavenge_root(false)
2291 { NOT_PRODUCT(_print_nm = NULL); }
2292 bool detected_scavenge_root() { return _detected_scavenge_root; }
2293 virtual void do_oop(oop* p) {
2294 if ((*p) != NULL && (*p)->is_scavengable()) {
2295 NOT_PRODUCT(maybe_print(p));
2296 _detected_scavenge_root = true;
2297 }
2298 }
2299 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2300
2301 #ifndef PRODUCT
2302 nmethod* _print_nm;
2303 void maybe_print(oop* p) {
2304 if (_print_nm == NULL) return;
2305 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root");
2306 tty->print_cr("" PTR_FORMAT "[offset=%d] detected scavengable oop " PTR_FORMAT " (found at " PTR_FORMAT ")",
2307 p2i(_print_nm), (int)((intptr_t)p - (intptr_t)_print_nm),
2308 p2i(*p), p2i(p));
2309 (*p)->print();
2310 }
2311 #endif //PRODUCT
2312 };
2313
2314 bool nmethod::detect_scavenge_root_oops() {
2315 DetectScavengeRoot detect_scavenge_root;
2316 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this);
2317 oops_do(&detect_scavenge_root);
2318 return detect_scavenge_root.detected_scavenge_root();
2319 }
2320
2321 // Method that knows how to preserve outgoing arguments at call. This method must be
2322 // called with a frame corresponding to a Java invoke
2323 void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) {
2324 #ifndef SHARK
2325 if (method() != NULL && !method()->is_native()) {
2326 SimpleScopeDesc ssd(this, fr.pc());
2327 Bytecode_invoke call(ssd.method(), ssd.bci());
2328 bool has_receiver = call.has_receiver();
2329 bool has_appendix = call.has_appendix();
2330 Symbol* signature = call.signature();
2331 fr.oops_compiled_arguments_do(signature, has_receiver, has_appendix, reg_map, f);
2332 }
2333 #endif // !SHARK
2334 }
2335
2336 inline bool includes(void* p, void* from, void* to) {
2337 return from <= p && p < to;
2338 }
2339
2340
2341 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
2342 assert(count >= 2, "must be sentinel values, at least");
2343
2344 #ifdef ASSERT
2345 // must be sorted and unique; we do a binary search in find_pc_desc()
2346 int prev_offset = pcs[0].pc_offset();
2347 assert(prev_offset == PcDesc::lower_offset_limit,
2348 "must start with a sentinel");
2349 for (int i = 1; i < count; i++) {
2350 int this_offset = pcs[i].pc_offset();
2351 assert(this_offset > prev_offset, "offsets must be sorted");
2352 prev_offset = this_offset;
2353 }
2354 assert(prev_offset == PcDesc::upper_offset_limit,
2355 "must end with a sentinel");
2356 #endif //ASSERT
2357
2358 // Search for MethodHandle invokes and tag the nmethod.
2359 for (int i = 0; i < count; i++) {
2360 if (pcs[i].is_method_handle_invoke()) {
2361 set_has_method_handle_invokes(true);
2362 break;
2363 }
2364 }
2365 assert(has_method_handle_invokes() == (_deoptimize_mh_offset != -1), "must have deopt mh handler");
2366
2367 int size = count * sizeof(PcDesc);
2368 assert(scopes_pcs_size() >= size, "oob");
2369 memcpy(scopes_pcs_begin(), pcs, size);
2370
2371 // Adjust the final sentinel downward.
2372 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
2373 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
2374 last_pc->set_pc_offset(content_size() + 1);
2375 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
2376 // Fill any rounding gaps with copies of the last record.
2377 last_pc[1] = last_pc[0];
2378 }
2379 // The following assert could fail if sizeof(PcDesc) is not
2380 // an integral multiple of oopSize (the rounding term).
2381 // If it fails, change the logic to always allocate a multiple
2382 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
2383 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
2384 }
2385
2386 void nmethod::copy_scopes_data(u_char* buffer, int size) {
2387 assert(scopes_data_size() >= size, "oob");
2388 memcpy(scopes_data_begin(), buffer, size);
2389 }
2390
2391 // When using JVMCI the address might be off by the size of a call instruction.
2392 bool nmethod::is_deopt_entry(address pc) {
2393 return pc == deopt_handler_begin()
2394 #if INCLUDE_JVMCI
2395 || pc == (deopt_handler_begin() + NativeCall::instruction_size)
2396 #endif
2397 ;
2398 }
2399
2400 #ifdef ASSERT
2401 static PcDesc* linear_search(nmethod* nm, int pc_offset, bool approximate) {
2402 PcDesc* lower = nm->scopes_pcs_begin();
2403 PcDesc* upper = nm->scopes_pcs_end();
2404 lower += 1; // exclude initial sentinel
2405 PcDesc* res = NULL;
2406 for (PcDesc* p = lower; p < upper; p++) {
2407 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc
2408 if (match_desc(p, pc_offset, approximate)) {
2409 if (res == NULL)
2410 res = p;
2411 else
2412 res = (PcDesc*) badAddress;
2413 }
2414 }
2415 return res;
2416 }
2417 #endif
2418
2419
2420 // Finds a PcDesc with real-pc equal to "pc"
2421 PcDesc* nmethod::find_pc_desc_internal(address pc, bool approximate) {
2422 address base_address = code_begin();
2423 if ((pc < base_address) ||
2424 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
2425 return NULL; // PC is wildly out of range
2426 }
2427 int pc_offset = (int) (pc - base_address);
2428
2429 // Check the PcDesc cache if it contains the desired PcDesc
2430 // (This as an almost 100% hit rate.)
2431 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
2432 if (res != NULL) {
2433 assert(res == linear_search(this, pc_offset, approximate), "cache ok");
2434 return res;
2435 }
2436
2437 // Fallback algorithm: quasi-linear search for the PcDesc
2438 // Find the last pc_offset less than the given offset.
2439 // The successor must be the required match, if there is a match at all.
2440 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
2441 PcDesc* lower = scopes_pcs_begin();
2442 PcDesc* upper = scopes_pcs_end();
2443 upper -= 1; // exclude final sentinel
2444 if (lower >= upper) return NULL; // native method; no PcDescs at all
2445
2446 #define assert_LU_OK \
2447 /* invariant on lower..upper during the following search: */ \
2448 assert(lower->pc_offset() < pc_offset, "sanity"); \
2449 assert(upper->pc_offset() >= pc_offset, "sanity")
2450 assert_LU_OK;
2451
2452 // Use the last successful return as a split point.
2453 PcDesc* mid = _pc_desc_cache.last_pc_desc();
2454 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
2455 if (mid->pc_offset() < pc_offset) {
2456 lower = mid;
2457 } else {
2458 upper = mid;
2459 }
2460
2461 // Take giant steps at first (4096, then 256, then 16, then 1)
2462 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
2463 const int RADIX = (1 << LOG2_RADIX);
2464 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
2465 while ((mid = lower + step) < upper) {
2466 assert_LU_OK;
2467 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
2468 if (mid->pc_offset() < pc_offset) {
2469 lower = mid;
2470 } else {
2471 upper = mid;
2472 break;
2473 }
2474 }
2475 assert_LU_OK;
2476 }
2477
2478 // Sneak up on the value with a linear search of length ~16.
2479 while (true) {
2480 assert_LU_OK;
2481 mid = lower + 1;
2482 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
2483 if (mid->pc_offset() < pc_offset) {
2484 lower = mid;
2485 } else {
2486 upper = mid;
2487 break;
2488 }
2489 }
2490 #undef assert_LU_OK
2491
2492 if (match_desc(upper, pc_offset, approximate)) {
2493 assert(upper == linear_search(this, pc_offset, approximate), "search ok");
2494 _pc_desc_cache.add_pc_desc(upper);
2495 return upper;
2496 } else {
2497 assert(NULL == linear_search(this, pc_offset, approximate), "search ok");
2498 return NULL;
2499 }
2500 }
2501
2502
2503 void nmethod::check_all_dependencies(DepChange& changes) {
2504 // Checked dependencies are allocated into this ResourceMark
2505 ResourceMark rm;
2506
2507 // Turn off dependency tracing while actually testing dependencies.
2508 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) );
2509
2510 typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash,
2511 &DependencySignature::equals, 11027> DepTable;
2512
2513 DepTable* table = new DepTable();
2514
2515 // Iterate over live nmethods and check dependencies of all nmethods that are not
2516 // marked for deoptimization. A particular dependency is only checked once.
2517 NMethodIterator iter;
2518 while(iter.next()) {
2519 nmethod* nm = iter.method();
2520 // Only notify for live nmethods
2521 if (nm->is_alive() && !nm->is_marked_for_deoptimization()) {
2522 for (Dependencies::DepStream deps(nm); deps.next(); ) {
2523 // Construct abstraction of a dependency.
2524 DependencySignature* current_sig = new DependencySignature(deps);
2525
2526 // Determine if dependency is already checked. table->put(...) returns
2527 // 'true' if the dependency is added (i.e., was not in the hashtable).
2528 if (table->put(*current_sig, 1)) {
2529 if (deps.check_dependency() != NULL) {
2530 // Dependency checking failed. Print out information about the failed
2531 // dependency and finally fail with an assert. We can fail here, since
2532 // dependency checking is never done in a product build.
2533 tty->print_cr("Failed dependency:");
2534 changes.print();
2535 nm->print();
2536 nm->print_dependencies();
2537 assert(false, "Should have been marked for deoptimization");
2538 }
2539 }
2540 }
2541 }
2542 }
2543 }
2544
2545 bool nmethod::check_dependency_on(DepChange& changes) {
2546 // What has happened:
2547 // 1) a new class dependee has been added
2548 // 2) dependee and all its super classes have been marked
2549 bool found_check = false; // set true if we are upset
2550 for (Dependencies::DepStream deps(this); deps.next(); ) {
2551 // Evaluate only relevant dependencies.
2552 if (deps.spot_check_dependency_at(changes) != NULL) {
2553 found_check = true;
2554 NOT_DEBUG(break);
2555 }
2556 }
2557 return found_check;
2558 }
2559
2560 bool nmethod::is_evol_dependent_on(Klass* dependee) {
2561 InstanceKlass *dependee_ik = InstanceKlass::cast(dependee);
2562 Array<Method*>* dependee_methods = dependee_ik->methods();
2563 for (Dependencies::DepStream deps(this); deps.next(); ) {
2564 if (deps.type() == Dependencies::evol_method) {
2565 Method* method = deps.method_argument(0);
2566 for (int j = 0; j < dependee_methods->length(); j++) {
2567 if (dependee_methods->at(j) == method) {
2568 // RC_TRACE macro has an embedded ResourceMark
2569 RC_TRACE(0x01000000,
2570 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)",
2571 _method->method_holder()->external_name(),
2572 _method->name()->as_C_string(),
2573 _method->signature()->as_C_string(), compile_id(),
2574 method->method_holder()->external_name(),
2575 method->name()->as_C_string(),
2576 method->signature()->as_C_string()));
2577 if (TraceDependencies || LogCompilation)
2578 deps.log_dependency(dependee);
2579 return true;
2580 }
2581 }
2582 }
2583 }
2584 return false;
2585 }
2586
2587 // Called from mark_for_deoptimization, when dependee is invalidated.
2588 bool nmethod::is_dependent_on_method(Method* dependee) {
2589 for (Dependencies::DepStream deps(this); deps.next(); ) {
2590 if (deps.type() != Dependencies::evol_method)
2591 continue;
2592 Method* method = deps.method_argument(0);
2593 if (method == dependee) return true;
2594 }
2595 return false;
2596 }
2597
2598
2599 bool nmethod::is_patchable_at(address instr_addr) {
2600 assert(insts_contains(instr_addr), "wrong nmethod used");
2601 if (is_zombie()) {
2602 // a zombie may never be patched
2603 return false;
2604 }
2605 return true;
2606 }
2607
2608
2609 address nmethod::continuation_for_implicit_exception(address pc) {
2610 // Exception happened outside inline-cache check code => we are inside
2611 // an active nmethod => use cpc to determine a return address
2612 int exception_offset = pc - code_begin();
2613 int cont_offset = ImplicitExceptionTable(this).at( exception_offset );
2614 #ifdef ASSERT
2615 if (cont_offset == 0) {
2616 Thread* thread = ThreadLocalStorage::get_thread_slow();
2617 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
2618 HandleMark hm(thread);
2619 ResourceMark rm(thread);
2620 CodeBlob* cb = CodeCache::find_blob(pc);
2621 assert(cb != NULL && cb == this, "");
2622 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, p2i(pc));
2623 print();
2624 method()->print_codes();
2625 print_code();
2626 print_pcs();
2627 }
2628 #endif
2629 if (cont_offset == 0) {
2630 // Let the normal error handling report the exception
2631 return NULL;
2632 }
2633 return code_begin() + cont_offset;
2634 }
2635
2636
2637
2638 void nmethod_init() {
2639 // make sure you didn't forget to adjust the filler fields
2640 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
2641 }
2642
2643
2644 //-------------------------------------------------------------------------------------------
2645
2646
2647 // QQQ might we make this work from a frame??
2648 nmethodLocker::nmethodLocker(address pc) {
2649 CodeBlob* cb = CodeCache::find_blob(pc);
2650 guarantee(cb != NULL && cb->is_nmethod(), "bad pc for a nmethod found");
2651 _nm = (nmethod*)cb;
2652 lock_nmethod(_nm);
2653 }
2654
2655 // Only JvmtiDeferredEvent::compiled_method_unload_event()
2656 // should pass zombie_ok == true.
2657 void nmethodLocker::lock_nmethod(nmethod* nm, bool zombie_ok) {
2658 if (nm == NULL) return;
2659 Atomic::inc(&nm->_lock_count);
2660 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method");
2661 }
2662
2663 void nmethodLocker::unlock_nmethod(nmethod* nm) {
2664 if (nm == NULL) return;
2665 Atomic::dec(&nm->_lock_count);
2666 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock");
2667 }
2668
2669 // -----------------------------------------------------------------------------
2670 // nmethod::get_deopt_original_pc
2671 //
2672 // Return the original PC for the given PC if:
2673 // (a) the given PC belongs to a nmethod and
2674 // (b) it is a deopt PC
2675 address nmethod::get_deopt_original_pc(const frame* fr) {
2676 if (fr->cb() == NULL) return NULL;
2677
2678 nmethod* nm = fr->cb()->as_nmethod_or_null();
2679 if (nm != NULL && nm->is_deopt_pc(fr->pc()))
2680 return nm->get_original_pc(fr);
2681
2682 return NULL;
2683 }
2684
2685
2686 // -----------------------------------------------------------------------------
2687 // MethodHandle
2688
2689 bool nmethod::is_method_handle_return(address return_pc) {
2690 if (!has_method_handle_invokes()) return false;
2691 PcDesc* pd = pc_desc_at(return_pc);
2692 if (pd == NULL)
2693 return false;
2694 return pd->is_method_handle_invoke();
2695 }
2696
2697
2698 // -----------------------------------------------------------------------------
2699 // Verification
2700
2701 class VerifyOopsClosure: public OopClosure {
2702 nmethod* _nm;
2703 bool _ok;
2704 public:
2705 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
2706 bool ok() { return _ok; }
2707 virtual void do_oop(oop* p) {
2708 if ((*p) == NULL || (*p)->is_oop()) return;
2709 if (_ok) {
2710 _nm->print_nmethod(true);
2711 _ok = false;
2712 }
2713 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2714 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2715 }
2716 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2717 };
2718
2719 void nmethod::verify() {
2720
2721 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant
2722 // seems odd.
2723
2724 if (is_zombie() || is_not_entrant() || is_unloaded())
2725 return;
2726
2727 // Make sure all the entry points are correctly aligned for patching.
2728 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
2729
2730 // assert(method()->is_oop(), "must be valid");
2731
2732 ResourceMark rm;
2733
2734 if (!CodeCache::contains(this)) {
2735 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this));
2736 }
2737
2738 if(is_native_method() )
2739 return;
2740
2741 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
2742 if (nm != this) {
2743 fatal("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this));
2744 }
2745
2746 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2747 if (! p->verify(this)) {
2748 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this));
2749 }
2750 }
2751
2752 VerifyOopsClosure voc(this);
2753 oops_do(&voc);
2754 assert(voc.ok(), "embedded oops must be OK");
2755 verify_scavenge_root_oops();
2756
2757 verify_scopes();
2758 }
2759
2760
2761 void nmethod::verify_interrupt_point(address call_site) {
2762 // Verify IC only when nmethod installation is finished.
2763 bool is_installed = (method()->code() == this) // nmethod is in state 'in_use' and installed
2764 || !this->is_in_use(); // nmethod is installed, but not in 'in_use' state
2765 if (is_installed) {
2766 Thread *cur = Thread::current();
2767 if (CompiledIC_lock->owner() == cur ||
2768 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) &&
2769 SafepointSynchronize::is_at_safepoint())) {
2770 CompiledIC_at(this, call_site);
2771 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
2772 } else {
2773 MutexLocker ml_verify (CompiledIC_lock);
2774 CompiledIC_at(this, call_site);
2775 }
2776 }
2777
2778 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address());
2779 assert(pd != NULL, "PcDesc must exist");
2780 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(),
2781 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(),
2782 pd->return_oop());
2783 !sd->is_top(); sd = sd->sender()) {
2784 sd->verify();
2785 }
2786 }
2787
2788 void nmethod::verify_scopes() {
2789 if( !method() ) return; // Runtime stubs have no scope
2790 if (method()->is_native()) return; // Ignore stub methods.
2791 // iterate through all interrupt point
2792 // and verify the debug information is valid.
2793 RelocIterator iter((nmethod*)this);
2794 while (iter.next()) {
2795 address stub = NULL;
2796 switch (iter.type()) {
2797 case relocInfo::virtual_call_type:
2798 verify_interrupt_point(iter.addr());
2799 break;
2800 case relocInfo::opt_virtual_call_type:
2801 stub = iter.opt_virtual_call_reloc()->static_stub();
2802 verify_interrupt_point(iter.addr());
2803 break;
2804 case relocInfo::static_call_type:
2805 stub = iter.static_call_reloc()->static_stub();
2806 //verify_interrupt_point(iter.addr());
2807 break;
2808 case relocInfo::runtime_call_type:
2809 address destination = iter.reloc()->value();
2810 // Right now there is no way to find out which entries support
2811 // an interrupt point. It would be nice if we had this
2812 // information in a table.
2813 break;
2814 }
2815 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section");
2816 }
2817 }
2818
2819
2820 // -----------------------------------------------------------------------------
2821 // Non-product code
2822 #ifndef PRODUCT
2823
2824 class DebugScavengeRoot: public OopClosure {
2825 nmethod* _nm;
2826 bool _ok;
2827 public:
2828 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { }
2829 bool ok() { return _ok; }
2830 virtual void do_oop(oop* p) {
2831 if ((*p) == NULL || !(*p)->is_scavengable()) return;
2832 if (_ok) {
2833 _nm->print_nmethod(true);
2834 _ok = false;
2835 }
2836 tty->print_cr("*** scavengable oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2837 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2838 (*p)->print();
2839 }
2840 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2841 };
2842
2843 void nmethod::verify_scavenge_root_oops() {
2844 if (UseG1GC) {
2845 return;
2846 }
2847
2848 if (!on_scavenge_root_list()) {
2849 // Actually look inside, to verify the claim that it's clean.
2850 DebugScavengeRoot debug_scavenge_root(this);
2851 oops_do(&debug_scavenge_root);
2852 if (!debug_scavenge_root.ok())
2853 fatal("found an unadvertised bad scavengable oop in the code cache");
2854 }
2855 assert(scavenge_root_not_marked(), "");
2856 }
2857
2858 #endif // PRODUCT
2859
2860 // Printing operations
2861
2862 void nmethod::print() const {
2863 ResourceMark rm;
2864 ttyLocker ttyl; // keep the following output all in one block
2865
2866 tty->print("Compiled method ");
2867
2868 if (is_compiled_by_c1()) {
2869 tty->print("(c1) ");
2870 } else if (is_compiled_by_c2()) {
2871 tty->print("(c2) ");
2872 } else if (is_compiled_by_shark()) {
2873 tty->print("(shark) ");
2874 } else if (is_compiled_by_jvmci()) {
2875 tty->print("(JVMCI) ");
2876 } else {
2877 tty->print("(nm) ");
2878 }
2879
2880 print_on(tty, NULL);
2881
2882 if (WizardMode) {
2883 tty->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this));
2884 tty->print(" for method " INTPTR_FORMAT , p2i(method()));
2885 tty->print(" { ");
2886 if (is_in_use()) tty->print("in_use ");
2887 if (is_not_entrant()) tty->print("not_entrant ");
2888 if (is_zombie()) tty->print("zombie ");
2889 if (is_unloaded()) tty->print("unloaded ");
2890 if (on_scavenge_root_list()) tty->print("scavenge_root ");
2891 tty->print_cr("}:");
2892 }
2893 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2894 p2i(this),
2895 p2i(this) + size(),
2896 size());
2897 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2898 p2i(relocation_begin()),
2899 p2i(relocation_end()),
2900 relocation_size());
2901 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2902 p2i(consts_begin()),
2903 p2i(consts_end()),
2904 consts_size());
2905 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2906 p2i(insts_begin()),
2907 p2i(insts_end()),
2908 insts_size());
2909 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2910 p2i(stub_begin()),
2911 p2i(stub_end()),
2912 stub_size());
2913 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2914 p2i(oops_begin()),
2915 p2i(oops_end()),
2916 oops_size());
2917 if (metadata_size () > 0) tty->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2918 p2i(metadata_begin()),
2919 p2i(metadata_end()),
2920 metadata_size());
2921 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2922 p2i(scopes_data_begin()),
2923 p2i(scopes_data_end()),
2924 scopes_data_size());
2925 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2926 p2i(scopes_pcs_begin()),
2927 p2i(scopes_pcs_end()),
2928 scopes_pcs_size());
2929 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2930 p2i(dependencies_begin()),
2931 p2i(dependencies_end()),
2932 dependencies_size());
2933 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2934 p2i(handler_table_begin()),
2935 p2i(handler_table_end()),
2936 handler_table_size());
2937 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2938 p2i(nul_chk_table_begin()),
2939 p2i(nul_chk_table_end()),
2940 nul_chk_table_size());
2941 }
2942
2943 void nmethod::print_code() {
2944 HandleMark hm;
2945 ResourceMark m;
2946 Disassembler::decode(this);
2947 }
2948
2949
2950 #ifndef PRODUCT
2951
2952 void nmethod::print_scopes() {
2953 // Find the first pc desc for all scopes in the code and print it.
2954 ResourceMark rm;
2955 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2956 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
2957 continue;
2958
2959 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
2960 while (sd != NULL) {
2961 sd->print_on(tty, p);
2962 sd = sd->sender();
2963 }
2964 }
2965 }
2966
2967 void nmethod::print_dependencies() {
2968 ResourceMark rm;
2969 ttyLocker ttyl; // keep the following output all in one block
2970 tty->print_cr("Dependencies:");
2971 for (Dependencies::DepStream deps(this); deps.next(); ) {
2972 deps.print_dependency();
2973 Klass* ctxk = deps.context_type();
2974 if (ctxk != NULL) {
2975 if (ctxk->is_instance_klass() && InstanceKlass::cast(ctxk)->is_dependent_nmethod(this)) {
2976 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name());
2977 }
2978 }
2979 deps.log_dependency(); // put it into the xml log also
2980 }
2981 }
2982
2983
2984 void nmethod::print_relocations() {
2985 ResourceMark m; // in case methods get printed via the debugger
2986 tty->print_cr("relocations:");
2987 RelocIterator iter(this);
2988 iter.print();
2989 if (UseRelocIndex) {
2990 jint* index_end = (jint*)relocation_end() - 1;
2991 jint index_size = *index_end;
2992 jint* index_start = (jint*)( (address)index_end - index_size );
2993 tty->print_cr(" index @" INTPTR_FORMAT ": index_size=%d", p2i(index_start), index_size);
2994 if (index_size > 0) {
2995 jint* ip;
2996 for (ip = index_start; ip+2 <= index_end; ip += 2)
2997 tty->print_cr(" (%d %d) addr=" INTPTR_FORMAT " @" INTPTR_FORMAT,
2998 ip[0],
2999 ip[1],
3000 p2i(header_end()+ip[0]),
3001 p2i(relocation_begin()-1+ip[1]));
3002 for (; ip < index_end; ip++)
3003 tty->print_cr(" (%d ?)", ip[0]);
3004 tty->print_cr(" @" INTPTR_FORMAT ": index_size=%d", p2i(ip), *ip);
3005 ip++;
3006 tty->print_cr("reloc_end @" INTPTR_FORMAT ":", p2i(ip));
3007 }
3008 }
3009 }
3010
3011
3012 void nmethod::print_pcs() {
3013 ResourceMark m; // in case methods get printed via debugger
3014 tty->print_cr("pc-bytecode offsets:");
3015 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
3016 p->print(this);
3017 }
3018 }
3019
3020 void nmethod::print_recorded_oops() {
3021 tty->print_cr("Recorded oops:");
3022 for (int i = 0; i < oops_count(); i++) {
3023 oop o = oop_at(i);
3024 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(o));
3025 o->print_value();
3026 tty->cr();
3027 }
3028 }
3029
3030 void nmethod::print_recorded_metadata() {
3031 tty->print_cr("Recorded metadata:");
3032 for (int i = 0; i < metadata_count(); i++) {
3033 Metadata* m = metadata_at(i);
3034 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(m));
3035 m->print_value_on_maybe_null(tty);
3036 tty->cr();
3037 }
3038 }
3039
3040 #endif // PRODUCT
3041
3042 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
3043 RelocIterator iter(this, begin, end);
3044 bool have_one = false;
3045 while (iter.next()) {
3046 have_one = true;
3047 switch (iter.type()) {
3048 case relocInfo::none: return "no_reloc";
3049 case relocInfo::oop_type: {
3050 stringStream st;
3051 oop_Relocation* r = iter.oop_reloc();
3052 oop obj = r->oop_value();
3053 st.print("oop(");
3054 if (obj == NULL) st.print("NULL");
3055 else obj->print_value_on(&st);
3056 st.print(")");
3057 return st.as_string();
3058 }
3059 case relocInfo::metadata_type: {
3060 stringStream st;
3061 metadata_Relocation* r = iter.metadata_reloc();
3062 Metadata* obj = r->metadata_value();
3063 st.print("metadata(");
3064 if (obj == NULL) st.print("NULL");
3065 else obj->print_value_on(&st);
3066 st.print(")");
3067 return st.as_string();
3068 }
3069 case relocInfo::runtime_call_type: {
3070 stringStream st;
3071 st.print("runtime_call");
3072 runtime_call_Relocation* r = iter.runtime_call_reloc();
3073 address dest = r->destination();
3074 CodeBlob* cb = CodeCache::find_blob(dest);
3075 if (cb != NULL) {
3076 st.print(" %s", cb->name());
3077 }
3078 return st.as_string();
3079 }
3080 case relocInfo::virtual_call_type: {
3081 stringStream st;
3082 st.print_raw("virtual_call");
3083 virtual_call_Relocation* r = iter.virtual_call_reloc();
3084 Method* m = r->method_value();
3085 if (m != NULL) {
3086 assert(m->is_method(), "");
3087 m->print_short_name(&st);
3088 }
3089 return st.as_string();
3090 }
3091 case relocInfo::opt_virtual_call_type: {
3092 stringStream st;
3093 st.print_raw("optimized virtual_call");
3094 opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc();
3095 Method* m = r->method_value();
3096 if (m != NULL) {
3097 assert(m->is_method(), "");
3098 m->print_short_name(&st);
3099 }
3100 return st.as_string();
3101 }
3102 case relocInfo::static_call_type: {
3103 stringStream st;
3104 st.print_raw("static_call");
3105 static_call_Relocation* r = iter.static_call_reloc();
3106 Method* m = r->method_value();
3107 if (m != NULL) {
3108 assert(m->is_method(), "");
3109 m->print_short_name(&st);
3110 }
3111 return st.as_string();
3112 }
3113 case relocInfo::static_stub_type: return "static_stub";
3114 case relocInfo::external_word_type: return "external_word";
3115 case relocInfo::internal_word_type: return "internal_word";
3116 case relocInfo::section_word_type: return "section_word";
3117 case relocInfo::poll_type: return "poll";
3118 case relocInfo::poll_return_type: return "poll_return";
3119 case relocInfo::type_mask: return "type_bit_mask";
3120 }
3121 }
3122 return have_one ? "other" : NULL;
3123 }
3124
3125 // Return a the last scope in (begin..end]
3126 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
3127 PcDesc* p = pc_desc_near(begin+1);
3128 if (p != NULL && p->real_pc(this) <= end) {
3129 return new ScopeDesc(this, p->scope_decode_offset(),
3130 p->obj_decode_offset(), p->should_reexecute(), p->rethrow_exception(),
3131 p->return_oop());
3132 }
3133 return NULL;
3134 }
3135
3136 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const {
3137 if (block_begin == entry_point()) stream->print_cr("[Entry Point]");
3138 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]");
3139 if (JVMCI_ONLY(_exception_offset >= 0 &&) block_begin == exception_begin()) stream->print_cr("[Exception Handler]");
3140 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]");
3141 if (JVMCI_ONLY(_deoptimize_offset >= 0 &&) block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]");
3142
3143 if (has_method_handle_invokes())
3144 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]");
3145
3146 if (block_begin == consts_begin()) stream->print_cr("[Constants]");
3147
3148 if (block_begin == entry_point()) {
3149 methodHandle m = method();
3150 if (m.not_null()) {
3151 stream->print(" # ");
3152 m->print_value_on(stream);
3153 stream->cr();
3154 }
3155 if (m.not_null() && !is_osr_method()) {
3156 ResourceMark rm;
3157 int sizeargs = m->size_of_parameters();
3158 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
3159 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
3160 {
3161 int sig_index = 0;
3162 if (!m->is_static())
3163 sig_bt[sig_index++] = T_OBJECT; // 'this'
3164 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) {
3165 BasicType t = ss.type();
3166 sig_bt[sig_index++] = t;
3167 if (type2size[t] == 2) {
3168 sig_bt[sig_index++] = T_VOID;
3169 } else {
3170 assert(type2size[t] == 1, "size is 1 or 2");
3171 }
3172 }
3173 assert(sig_index == sizeargs, "");
3174 }
3175 const char* spname = "sp"; // make arch-specific?
3176 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false);
3177 int stack_slot_offset = this->frame_size() * wordSize;
3178 int tab1 = 14, tab2 = 24;
3179 int sig_index = 0;
3180 int arg_index = (m->is_static() ? 0 : -1);
3181 bool did_old_sp = false;
3182 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) {
3183 bool at_this = (arg_index == -1);
3184 bool at_old_sp = false;
3185 BasicType t = (at_this ? T_OBJECT : ss.type());
3186 assert(t == sig_bt[sig_index], "sigs in sync");
3187 if (at_this)
3188 stream->print(" # this: ");
3189 else
3190 stream->print(" # parm%d: ", arg_index);
3191 stream->move_to(tab1);
3192 VMReg fst = regs[sig_index].first();
3193 VMReg snd = regs[sig_index].second();
3194 if (fst->is_reg()) {
3195 stream->print("%s", fst->name());
3196 if (snd->is_valid()) {
3197 stream->print(":%s", snd->name());
3198 }
3199 } else if (fst->is_stack()) {
3200 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
3201 if (offset == stack_slot_offset) at_old_sp = true;
3202 stream->print("[%s+0x%x]", spname, offset);
3203 } else {
3204 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
3205 }
3206 stream->print(" ");
3207 stream->move_to(tab2);
3208 stream->print("= ");
3209 if (at_this) {
3210 m->method_holder()->print_value_on(stream);
3211 } else {
3212 bool did_name = false;
3213 if (!at_this && ss.is_object()) {
3214 Symbol* name = ss.as_symbol_or_null();
3215 if (name != NULL) {
3216 name->print_value_on(stream);
3217 did_name = true;
3218 }
3219 }
3220 if (!did_name)
3221 stream->print("%s", type2name(t));
3222 }
3223 if (at_old_sp) {
3224 stream->print(" (%s of caller)", spname);
3225 did_old_sp = true;
3226 }
3227 stream->cr();
3228 sig_index += type2size[t];
3229 arg_index += 1;
3230 if (!at_this) ss.next();
3231 }
3232 if (!did_old_sp) {
3233 stream->print(" # ");
3234 stream->move_to(tab1);
3235 stream->print("[%s+0x%x]", spname, stack_slot_offset);
3236 stream->print(" (%s of caller)", spname);
3237 stream->cr();
3238 }
3239 }
3240 }
3241 }
3242
3243 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) {
3244 // First, find an oopmap in (begin, end].
3245 // We use the odd half-closed interval so that oop maps and scope descs
3246 // which are tied to the byte after a call are printed with the call itself.
3247 address base = code_begin();
3248 ImmutableOopMapSet* oms = oop_maps();
3249 if (oms != NULL) {
3250 for (int i = 0, imax = oms->count(); i < imax; i++) {
3251 const ImmutableOopMapPair* pair = oms->pair_at(i);
3252 const ImmutableOopMap* om = pair->get_from(oms);
3253 address pc = base + pair->pc_offset();
3254 if (pc > begin) {
3255 if (pc <= end) {
3256 st->move_to(column);
3257 st->print("; ");
3258 om->print_on(st);
3259 }
3260 break;
3261 }
3262 }
3263 }
3264
3265 // Print any debug info present at this pc.
3266 ScopeDesc* sd = scope_desc_in(begin, end);
3267 if (sd != NULL) {
3268 st->move_to(column);
3269 if (sd->bci() == SynchronizationEntryBCI) {
3270 st->print(";*synchronization entry");
3271 } else {
3272 if (sd->method() == NULL) {
3273 st->print("method is NULL");
3274 } else if (sd->method()->is_native()) {
3275 st->print("method is native");
3276 } else {
3277 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci());
3278 st->print(";*%s", Bytecodes::name(bc));
3279 switch (bc) {
3280 case Bytecodes::_invokevirtual:
3281 case Bytecodes::_invokespecial:
3282 case Bytecodes::_invokestatic:
3283 case Bytecodes::_invokeinterface:
3284 {
3285 Bytecode_invoke invoke(sd->method(), sd->bci());
3286 st->print(" ");
3287 if (invoke.name() != NULL)
3288 invoke.name()->print_symbol_on(st);
3289 else
3290 st->print("<UNKNOWN>");
3291 break;
3292 }
3293 case Bytecodes::_getfield:
3294 case Bytecodes::_putfield:
3295 case Bytecodes::_getstatic:
3296 case Bytecodes::_putstatic:
3297 {
3298 Bytecode_field field(sd->method(), sd->bci());
3299 st->print(" ");
3300 if (field.name() != NULL)
3301 field.name()->print_symbol_on(st);
3302 else
3303 st->print("<UNKNOWN>");
3304 }
3305 }
3306 }
3307 st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop());
3308 }
3309
3310 // Print all scopes
3311 for (;sd != NULL; sd = sd->sender()) {
3312 st->move_to(column);
3313 st->print("; -");
3314 if (sd->method() == NULL) {
3315 st->print("method is NULL");
3316 } else {
3317 sd->method()->print_short_name(st);
3318 }
3319 int lineno = sd->method()->line_number_from_bci(sd->bci());
3320 if (lineno != -1) {
3321 st->print("@%d (line %d)", sd->bci(), lineno);
3322 } else {
3323 st->print("@%d", sd->bci());
3324 }
3325 st->cr();
3326 }
3327 }
3328
3329 // Print relocation information
3330 const char* str = reloc_string_for(begin, end);
3331 if (str != NULL) {
3332 if (sd != NULL) st->cr();
3333 st->move_to(column);
3334 st->print("; {%s}", str);
3335 }
3336 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin());
3337 if (cont_offset != 0) {
3338 st->move_to(column);
3339 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset));
3340 }
3341
3342 }
3343
3344 #ifndef PRODUCT
3345
3346 void nmethod::print_value_on(outputStream* st) const {
3347 st->print("nmethod");
3348 print_on(st, NULL);
3349 }
3350
3351 void nmethod::print_calls(outputStream* st) {
3352 RelocIterator iter(this);
3353 while (iter.next()) {
3354 switch (iter.type()) {
3355 case relocInfo::virtual_call_type:
3356 case relocInfo::opt_virtual_call_type: {
3357 VerifyMutexLocker mc(CompiledIC_lock);
3358 CompiledIC_at(&iter)->print();
3359 break;
3360 }
3361 case relocInfo::static_call_type:
3362 st->print_cr("Static call at " INTPTR_FORMAT, p2i(iter.reloc()->addr()));
3363 compiledStaticCall_at(iter.reloc())->print();
3364 break;
3365 }
3366 }
3367 }
3368
3369 void nmethod::print_handler_table() {
3370 ExceptionHandlerTable(this).print();
3371 }
3372
3373 void nmethod::print_nul_chk_table() {
3374 ImplicitExceptionTable(this).print(code_begin());
3375 }
3376
3377 void nmethod::print_statistics() {
3378 ttyLocker ttyl;
3379 if (xtty != NULL) xtty->head("statistics type='nmethod'");
3380 native_nmethod_stats.print_native_nmethod_stats();
3381 #ifdef COMPILER1
3382 c1_java_nmethod_stats.print_nmethod_stats("C1");
3383 #endif
3384 #ifdef COMPILER2
3385 c2_java_nmethod_stats.print_nmethod_stats("C2");
3386 #endif
3387 #if INCLUDE_JVMCI
3388 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI");
3389 #endif
3390 #ifdef SHARK
3391 shark_java_nmethod_stats.print_nmethod_stats("Shark");
3392 #endif
3393 unknown_java_nmethod_stats.print_nmethod_stats("Unknown");
3394 DebugInformationRecorder::print_statistics();
3395 #ifndef PRODUCT
3396 pc_nmethod_stats.print_pc_stats();
3397 #endif
3398 Dependencies::print_statistics();
3399 if (xtty != NULL) xtty->tail("statistics");
3400 }
3401
3402 #endif // !PRODUCT
3403
3404 #if INCLUDE_JVMCI
3405 void nmethod::clear_jvmci_installed_code() {
3406 // This must be done carefully to maintain nmethod remembered sets properly
3407 BarrierSet* bs = Universe::heap()->barrier_set();
3408 bs->write_ref_nmethod_pre(&_jvmci_installed_code, this);
3409 _jvmci_installed_code = NULL;
3410 bs->write_ref_nmethod_post(&_jvmci_installed_code, this);
3411 }
3412
3413 void nmethod::maybe_invalidate_installed_code() {
3414 if (_jvmci_installed_code != NULL) {
3415 if (!is_alive()) {
3416 // Break the link between nmethod and InstalledCode such that the nmethod
3417 // can subsequently be flushed safely. The link must be maintained while
3418 // the method could have live activations since invalidateInstalledCode
3419 // might want to invalidate all existing activations.
3420 InstalledCode::set_address(_jvmci_installed_code, 0);
3421 InstalledCode::set_entryPoint(_jvmci_installed_code, 0);
3422 clear_jvmci_installed_code();
3423 } else if (is_not_entrant()) {
3424 InstalledCode::set_entryPoint(_jvmci_installed_code, 0);
3425 }
3426 }
3427 }
3428
3429 char* nmethod::jvmci_installed_code_name(char* buf, size_t buflen) {
3430 if (!this->is_compiled_by_jvmci()) {
3431 return NULL;
3432 }
3433 oop installedCode = this->jvmci_installed_code();
3434 if (installedCode != NULL) {
3435 oop installedCodeName = NULL;
3436 if (installedCode->is_a(InstalledCode::klass())) {
3437 installedCodeName = InstalledCode::name(installedCode);
3438 }
3439 if (installedCodeName != NULL) {
3440 return java_lang_String::as_utf8_string(installedCodeName, buf, (int)buflen);
3441 } else {
3442 jio_snprintf(buf, buflen, "null");
3443 return buf;
3444 }
3445 }
3446 jio_snprintf(buf, buflen, "noInstalledCode");
3447 return buf;
3448 }
3449 #endif
3450
3451 Method* nmethod::attached_method(address call_instr) {
3452 assert(code_contains(call_instr), "not part of the nmethod");
3453 RelocIterator iter(this, call_instr, call_instr + 1);
3454 while (iter.next()) {
3455 if (iter.addr() == call_instr) {
3456 switch(iter.type()) {
3457 case relocInfo::static_call_type: return iter.static_call_reloc()->method_value();
3458 case relocInfo::opt_virtual_call_type: return iter.opt_virtual_call_reloc()->method_value();
3459 case relocInfo::virtual_call_type: return iter.virtual_call_reloc()->method_value();
3460 }
3461 }
3462 }
3463 return NULL; // not found
3464 }
3465