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 (PrintDebugInfo || CompilerOracle::has_option_string(_method, "PrintDebugInfo")) {
982 print_scopes();
983 }
984 if (PrintRelocations || CompilerOracle::has_option_string(_method, "PrintRelocations")) {
985 print_relocations();
986 }
987 if (PrintDependencies || CompilerOracle::has_option_string(_method, "PrintDependencies")) {
988 print_dependencies();
989 }
990 if (PrintExceptionHandlers) {
991 print_handler_table();
992 print_nul_chk_table();
993 }
994 if (xtty != NULL) {
995 xtty->tail("print_nmethod");
996 }
997 }
998
999
1000 // Promote one word from an assembly-time handle to a live embedded oop.
1001 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
1002 if (handle == NULL ||
1003 // As a special case, IC oops are initialized to 1 or -1.
1004 handle == (jobject) Universe::non_oop_word()) {
1005 (*dest) = (oop) handle;
1006 } else {
1007 (*dest) = JNIHandles::resolve_non_null(handle);
1008 }
1009 }
1010
1011
1012 // Have to have the same name because it's called by a template
1013 void nmethod::copy_values(GrowableArray<jobject>* array) {
1014 int length = array->length();
1015 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
1016 oop* dest = oops_begin();
1017 for (int index = 0 ; index < length; index++) {
1018 initialize_immediate_oop(&dest[index], array->at(index));
1019 }
1020
1021 // Now we can fix up all the oops in the code. We need to do this
1022 // in the code because the assembler uses jobjects as placeholders.
1023 // The code and relocations have already been initialized by the
1024 // CodeBlob constructor, so it is valid even at this early point to
1025 // iterate over relocations and patch the code.
1026 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true);
1027 }
1028
1029 void nmethod::copy_values(GrowableArray<Metadata*>* array) {
1030 int length = array->length();
1031 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough");
1032 Metadata** dest = metadata_begin();
1033 for (int index = 0 ; index < length; index++) {
1034 dest[index] = array->at(index);
1035 }
1036 }
1037
1038 bool nmethod::is_at_poll_return(address pc) {
1039 RelocIterator iter(this, pc, pc+1);
1040 while (iter.next()) {
1041 if (iter.type() == relocInfo::poll_return_type)
1042 return true;
1043 }
1044 return false;
1045 }
1046
1047
1048 bool nmethod::is_at_poll_or_poll_return(address pc) {
1049 RelocIterator iter(this, pc, pc+1);
1050 while (iter.next()) {
1051 relocInfo::relocType t = iter.type();
1052 if (t == relocInfo::poll_return_type || t == relocInfo::poll_type)
1053 return true;
1054 }
1055 return false;
1056 }
1057
1058
1059 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) {
1060 // re-patch all oop-bearing instructions, just in case some oops moved
1061 RelocIterator iter(this, begin, end);
1062 while (iter.next()) {
1063 if (iter.type() == relocInfo::oop_type) {
1064 oop_Relocation* reloc = iter.oop_reloc();
1065 if (initialize_immediates && reloc->oop_is_immediate()) {
1066 oop* dest = reloc->oop_addr();
1067 initialize_immediate_oop(dest, (jobject) *dest);
1068 }
1069 // Refresh the oop-related bits of this instruction.
1070 reloc->fix_oop_relocation();
1071 } else if (iter.type() == relocInfo::metadata_type) {
1072 metadata_Relocation* reloc = iter.metadata_reloc();
1073 reloc->fix_metadata_relocation();
1074 }
1075 }
1076 }
1077
1078
1079 void nmethod::verify_oop_relocations() {
1080 // Ensure sure that the code matches the current oop values
1081 RelocIterator iter(this, NULL, NULL);
1082 while (iter.next()) {
1083 if (iter.type() == relocInfo::oop_type) {
1084 oop_Relocation* reloc = iter.oop_reloc();
1085 if (!reloc->oop_is_immediate()) {
1086 reloc->verify_oop_relocation();
1087 }
1088 }
1089 }
1090 }
1091
1092
1093 ScopeDesc* nmethod::scope_desc_at(address pc) {
1094 PcDesc* pd = pc_desc_at(pc);
1095 guarantee(pd != NULL, "scope must be present");
1096 return new ScopeDesc(this, pd->scope_decode_offset(),
1097 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(),
1098 pd->return_oop());
1099 }
1100
1101
1102 void nmethod::clear_inline_caches() {
1103 assert(SafepointSynchronize::is_at_safepoint(), "cleaning of IC's only allowed at safepoint");
1104 if (is_zombie()) {
1105 return;
1106 }
1107
1108 RelocIterator iter(this);
1109 while (iter.next()) {
1110 iter.reloc()->clear_inline_cache();
1111 }
1112 }
1113
1114 // Clear ICStubs of all compiled ICs
1115 void nmethod::clear_ic_stubs() {
1116 assert_locked_or_safepoint(CompiledIC_lock);
1117 RelocIterator iter(this);
1118 while(iter.next()) {
1119 if (iter.type() == relocInfo::virtual_call_type) {
1120 CompiledIC* ic = CompiledIC_at(&iter);
1121 ic->clear_ic_stub();
1122 }
1123 }
1124 }
1125
1126
1127 void nmethod::cleanup_inline_caches() {
1128 assert_locked_or_safepoint(CompiledIC_lock);
1129
1130 // If the method is not entrant or zombie then a JMP is plastered over the
1131 // first few bytes. If an oop in the old code was there, that oop
1132 // should not get GC'd. Skip the first few bytes of oops on
1133 // not-entrant methods.
1134 address low_boundary = verified_entry_point();
1135 if (!is_in_use()) {
1136 low_boundary += NativeJump::instruction_size;
1137 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1138 // This means that the low_boundary is going to be a little too high.
1139 // This shouldn't matter, since oops of non-entrant methods are never used.
1140 // In fact, why are we bothering to look at oops in a non-entrant method??
1141 }
1142
1143 // Find all calls in an nmethod and clear the ones that point to non-entrant,
1144 // zombie and unloaded nmethods.
1145 ResourceMark rm;
1146 RelocIterator iter(this, low_boundary);
1147 while(iter.next()) {
1148 switch(iter.type()) {
1149 case relocInfo::virtual_call_type:
1150 case relocInfo::opt_virtual_call_type: {
1151 CompiledIC *ic = CompiledIC_at(&iter);
1152 // Ok, to lookup references to zombies here
1153 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
1154 if( cb != NULL && cb->is_nmethod() ) {
1155 nmethod* nm = (nmethod*)cb;
1156 // Clean inline caches pointing to zombie, non-entrant and unloaded methods
1157 if (!nm->is_in_use() || (nm->method()->code() != nm)) ic->set_to_clean(is_alive());
1158 }
1159 break;
1160 }
1161 case relocInfo::static_call_type: {
1162 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
1163 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
1164 if( cb != NULL && cb->is_nmethod() ) {
1165 nmethod* nm = (nmethod*)cb;
1166 // Clean inline caches pointing to zombie, non-entrant and unloaded methods
1167 if (!nm->is_in_use() || (nm->method()->code() != nm)) csc->set_to_clean();
1168 }
1169 break;
1170 }
1171 }
1172 }
1173 }
1174
1175 void nmethod::verify_clean_inline_caches() {
1176 assert_locked_or_safepoint(CompiledIC_lock);
1177
1178 // If the method is not entrant or zombie then a JMP is plastered over the
1179 // first few bytes. If an oop in the old code was there, that oop
1180 // should not get GC'd. Skip the first few bytes of oops on
1181 // not-entrant methods.
1182 address low_boundary = verified_entry_point();
1183 if (!is_in_use()) {
1184 low_boundary += NativeJump::instruction_size;
1185 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1186 // This means that the low_boundary is going to be a little too high.
1187 // This shouldn't matter, since oops of non-entrant methods are never used.
1188 // In fact, why are we bothering to look at oops in a non-entrant method??
1189 }
1190
1191 ResourceMark rm;
1192 RelocIterator iter(this, low_boundary);
1193 while(iter.next()) {
1194 switch(iter.type()) {
1195 case relocInfo::virtual_call_type:
1196 case relocInfo::opt_virtual_call_type: {
1197 CompiledIC *ic = CompiledIC_at(&iter);
1198 // Ok, to lookup references to zombies here
1199 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
1200 if( cb != NULL && cb->is_nmethod() ) {
1201 nmethod* nm = (nmethod*)cb;
1202 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
1203 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1204 assert(ic->is_clean(), "IC should be clean");
1205 }
1206 }
1207 break;
1208 }
1209 case relocInfo::static_call_type: {
1210 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
1211 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
1212 if( cb != NULL && cb->is_nmethod() ) {
1213 nmethod* nm = (nmethod*)cb;
1214 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
1215 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1216 assert(csc->is_clean(), "IC should be clean");
1217 }
1218 }
1219 break;
1220 }
1221 }
1222 }
1223 }
1224
1225 int nmethod::verify_icholder_relocations() {
1226 int count = 0;
1227
1228 RelocIterator iter(this);
1229 while(iter.next()) {
1230 if (iter.type() == relocInfo::virtual_call_type) {
1231 if (CompiledIC::is_icholder_call_site(iter.virtual_call_reloc())) {
1232 CompiledIC *ic = CompiledIC_at(&iter);
1233 if (TraceCompiledIC) {
1234 tty->print("noticed icholder " INTPTR_FORMAT " ", p2i(ic->cached_icholder()));
1235 ic->print();
1236 }
1237 assert(ic->cached_icholder() != NULL, "must be non-NULL");
1238 count++;
1239 }
1240 }
1241 }
1242
1243 return count;
1244 }
1245
1246 // This is a private interface with the sweeper.
1247 void nmethod::mark_as_seen_on_stack() {
1248 assert(is_alive(), "Must be an alive method");
1249 // Set the traversal mark to ensure that the sweeper does 2
1250 // cleaning passes before moving to zombie.
1251 set_stack_traversal_mark(NMethodSweeper::traversal_count());
1252 }
1253
1254 // Tell if a non-entrant method can be converted to a zombie (i.e.,
1255 // there are no activations on the stack, not in use by the VM,
1256 // and not in use by the ServiceThread)
1257 bool nmethod::can_convert_to_zombie() {
1258 assert(is_not_entrant(), "must be a non-entrant method");
1259
1260 // Since the nmethod sweeper only does partial sweep the sweeper's traversal
1261 // count can be greater than the stack traversal count before it hits the
1262 // nmethod for the second time.
1263 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count() &&
1264 !is_locked_by_vm();
1265 }
1266
1267 void nmethod::inc_decompile_count() {
1268 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return;
1269 // Could be gated by ProfileTraps, but do not bother...
1270 Method* m = method();
1271 if (m == NULL) return;
1272 MethodData* mdo = m->method_data();
1273 if (mdo == NULL) return;
1274 // There is a benign race here. See comments in methodData.hpp.
1275 mdo->inc_decompile_count();
1276 }
1277
1278 void nmethod::increase_unloading_clock() {
1279 _global_unloading_clock++;
1280 if (_global_unloading_clock == 0) {
1281 // _nmethods are allocated with _unloading_clock == 0,
1282 // so 0 is never used as a clock value.
1283 _global_unloading_clock = 1;
1284 }
1285 }
1286
1287 void nmethod::set_unloading_clock(unsigned char unloading_clock) {
1288 OrderAccess::release_store((volatile jubyte*)&_unloading_clock, unloading_clock);
1289 }
1290
1291 unsigned char nmethod::unloading_clock() {
1292 return (unsigned char)OrderAccess::load_acquire((volatile jubyte*)&_unloading_clock);
1293 }
1294
1295 void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) {
1296
1297 post_compiled_method_unload();
1298
1299 // Since this nmethod is being unloaded, make sure that dependencies
1300 // recorded in instanceKlasses get flushed and pass non-NULL closure to
1301 // indicate that this work is being done during a GC.
1302 assert(Universe::heap()->is_gc_active(), "should only be called during gc");
1303 assert(is_alive != NULL, "Should be non-NULL");
1304 // A non-NULL is_alive closure indicates that this is being called during GC.
1305 flush_dependencies(is_alive);
1306
1307 // Break cycle between nmethod & method
1308 if (TraceClassUnloading && WizardMode) {
1309 tty->print_cr("[Class unloading: Making nmethod " INTPTR_FORMAT
1310 " unloadable], Method*(" INTPTR_FORMAT
1311 "), cause(" INTPTR_FORMAT ")",
1312 p2i(this), p2i(_method), p2i(cause));
1313 if (!Universe::heap()->is_gc_active())
1314 cause->klass()->print();
1315 }
1316 // Unlink the osr method, so we do not look this up again
1317 if (is_osr_method()) {
1318 invalidate_osr_method();
1319 }
1320 // If _method is already NULL the Method* is about to be unloaded,
1321 // so we don't have to break the cycle. Note that it is possible to
1322 // have the Method* live here, in case we unload the nmethod because
1323 // it is pointing to some oop (other than the Method*) being unloaded.
1324 if (_method != NULL) {
1325 // OSR methods point to the Method*, but the Method* does not
1326 // point back!
1327 if (_method->code() == this) {
1328 _method->clear_code(); // Break a cycle
1329 }
1330 _method = NULL; // Clear the method of this dead nmethod
1331 }
1332
1333 // Make the class unloaded - i.e., change state and notify sweeper
1334 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
1335 if (is_in_use()) {
1336 // Transitioning directly from live to unloaded -- so
1337 // we need to force a cache clean-up; remember this
1338 // for later on.
1339 CodeCache::set_needs_cache_clean(true);
1340 }
1341
1342 // Unregister must be done before the state change
1343 Universe::heap()->unregister_nmethod(this);
1344
1345 _state = unloaded;
1346
1347 #if INCLUDE_JVMCI
1348 // The method can only be unloaded after the pointer to the installed code
1349 // Java wrapper is no longer alive. Here we need to clear out this weak
1350 // reference to the dead object. Nulling out the reference has to happen
1351 // after the method is unregistered since the original value may be still
1352 // tracked by the rset.
1353 maybe_invalidate_installed_code();
1354 #endif
1355
1356 // Log the unloading.
1357 log_state_change();
1358
1359 // The Method* is gone at this point
1360 assert(_method == NULL, "Tautology");
1361
1362 set_osr_link(NULL);
1363 //set_scavenge_root_link(NULL); // done by prune_scavenge_root_nmethods
1364 NMethodSweeper::report_state_change(this);
1365 }
1366
1367 void nmethod::invalidate_osr_method() {
1368 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
1369 // Remove from list of active nmethods
1370 if (method() != NULL)
1371 method()->method_holder()->remove_osr_nmethod(this);
1372 }
1373
1374 void nmethod::log_state_change() const {
1375 if (LogCompilation) {
1376 if (xtty != NULL) {
1377 ttyLocker ttyl; // keep the following output all in one block
1378 if (_state == unloaded) {
1379 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'",
1380 os::current_thread_id());
1381 } else {
1382 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s",
1383 os::current_thread_id(),
1384 (_state == zombie ? " zombie='1'" : ""));
1385 }
1386 log_identity(xtty);
1387 xtty->stamp();
1388 xtty->end_elem();
1389 }
1390 }
1391 if (PrintCompilation && _state != unloaded) {
1392 print_on(tty, _state == zombie ? "made zombie" : "made not entrant");
1393 }
1394 }
1395
1396 /**
1397 * Common functionality for both make_not_entrant and make_zombie
1398 */
1399 bool nmethod::make_not_entrant_or_zombie(unsigned int state) {
1400 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant");
1401 assert(!is_zombie(), "should not already be a zombie");
1402
1403 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below.
1404 nmethodLocker nml(this);
1405 methodHandle the_method(method());
1406 No_Safepoint_Verifier nsv;
1407
1408 // during patching, depending on the nmethod state we must notify the GC that
1409 // code has been unloaded, unregistering it. We cannot do this right while
1410 // holding the Patching_lock because we need to use the CodeCache_lock. This
1411 // would be prone to deadlocks.
1412 // This flag is used to remember whether we need to later lock and unregister.
1413 bool nmethod_needs_unregister = false;
1414
1415 {
1416 // invalidate osr nmethod before acquiring the patching lock since
1417 // they both acquire leaf locks and we don't want a deadlock.
1418 // This logic is equivalent to the logic below for patching the
1419 // verified entry point of regular methods.
1420 if (is_osr_method()) {
1421 // this effectively makes the osr nmethod not entrant
1422 invalidate_osr_method();
1423 }
1424
1425 // Enter critical section. Does not block for safepoint.
1426 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1427
1428 if (_state == state) {
1429 // another thread already performed this transition so nothing
1430 // to do, but return false to indicate this.
1431 return false;
1432 }
1433
1434 // The caller can be calling the method statically or through an inline
1435 // cache call.
1436 if (!is_osr_method() && !is_not_entrant()) {
1437 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
1438 SharedRuntime::get_handle_wrong_method_stub());
1439 }
1440
1441 if (is_in_use()) {
1442 // It's a true state change, so mark the method as decompiled.
1443 // Do it only for transition from alive.
1444 inc_decompile_count();
1445 }
1446
1447 // If the state is becoming a zombie, signal to unregister the nmethod with
1448 // the heap.
1449 // This nmethod may have already been unloaded during a full GC.
1450 if ((state == zombie) && !is_unloaded()) {
1451 nmethod_needs_unregister = true;
1452 }
1453
1454 // Must happen before state change. Otherwise we have a race condition in
1455 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately
1456 // transition its state from 'not_entrant' to 'zombie' without having to wait
1457 // for stack scanning.
1458 if (state == not_entrant) {
1459 mark_as_seen_on_stack();
1460 OrderAccess::storestore();
1461 }
1462
1463 // Change state
1464 _state = state;
1465
1466 // Log the transition once
1467 log_state_change();
1468
1469 // Remove nmethod from method.
1470 // We need to check if both the _code and _from_compiled_code_entry_point
1471 // refer to this nmethod because there is a race in setting these two fields
1472 // in Method* as seen in bugid 4947125.
1473 // If the vep() points to the zombie nmethod, the memory for the nmethod
1474 // could be flushed and the compiler and vtable stubs could still call
1475 // through it.
1476 if (method() != NULL && (method()->code() == this ||
1477 method()->from_compiled_entry() == verified_entry_point())) {
1478 HandleMark hm;
1479 method()->clear_code();
1480 }
1481 } // leave critical region under Patching_lock
1482
1483 // When the nmethod becomes zombie it is no longer alive so the
1484 // dependencies must be flushed. nmethods in the not_entrant
1485 // state will be flushed later when the transition to zombie
1486 // happens or they get unloaded.
1487 if (state == zombie) {
1488 {
1489 // Flushing dependecies must be done before any possible
1490 // safepoint can sneak in, otherwise the oops used by the
1491 // dependency logic could have become stale.
1492 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1493 if (nmethod_needs_unregister) {
1494 Universe::heap()->unregister_nmethod(this);
1495 }
1496 flush_dependencies(NULL);
1497 }
1498
1499 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload
1500 // event and it hasn't already been reported for this nmethod then
1501 // report it now. The event may have been reported earilier if the GC
1502 // marked it for unloading). JvmtiDeferredEventQueue support means
1503 // we no longer go to a safepoint here.
1504 post_compiled_method_unload();
1505
1506 #ifdef ASSERT
1507 // It's no longer safe to access the oops section since zombie
1508 // nmethods aren't scanned for GC.
1509 _oops_are_stale = true;
1510 #endif
1511 // the Method may be reclaimed by class unloading now that the
1512 // nmethod is in zombie state
1513 set_method(NULL);
1514 } else {
1515 assert(state == not_entrant, "other cases may need to be handled differently");
1516 }
1517
1518 JVMCI_ONLY(maybe_invalidate_installed_code());
1519
1520 if (TraceCreateZombies) {
1521 ResourceMark m;
1522 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");
1523 }
1524
1525 NMethodSweeper::report_state_change(this);
1526 return true;
1527 }
1528
1529 void nmethod::flush() {
1530 // Note that there are no valid oops in the nmethod anymore.
1531 assert(is_zombie() || (is_osr_method() && is_unloaded()), "must be a zombie method");
1532 assert(is_marked_for_reclamation() || (is_osr_method() && is_unloaded()), "must be marked for reclamation");
1533
1534 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed");
1535 assert_locked_or_safepoint(CodeCache_lock);
1536
1537 // completely deallocate this method
1538 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, p2i(this));
1539 if (PrintMethodFlushing) {
1540 tty->print_cr("*flushing nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT
1541 "/Free CodeCache:" SIZE_FORMAT "Kb",
1542 _compile_id, p2i(this), CodeCache::blob_count(),
1543 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024);
1544 }
1545
1546 // We need to deallocate any ExceptionCache data.
1547 // Note that we do not need to grab the nmethod lock for this, it
1548 // better be thread safe if we're disposing of it!
1549 ExceptionCache* ec = exception_cache();
1550 set_exception_cache(NULL);
1551 while(ec != NULL) {
1552 ExceptionCache* next = ec->next();
1553 delete ec;
1554 ec = next;
1555 }
1556
1557 if (on_scavenge_root_list()) {
1558 CodeCache::drop_scavenge_root_nmethod(this);
1559 }
1560
1561 #ifdef SHARK
1562 ((SharkCompiler *) compiler())->free_compiled_method(insts_begin());
1563 #endif // SHARK
1564
1565 ((CodeBlob*)(this))->flush();
1566
1567 CodeCache::free(this);
1568 }
1569
1570 //
1571 // Notify all classes this nmethod is dependent on that it is no
1572 // longer dependent. This should only be called in two situations.
1573 // First, when a nmethod transitions to a zombie all dependents need
1574 // to be clear. Since zombification happens at a safepoint there's no
1575 // synchronization issues. The second place is a little more tricky.
1576 // During phase 1 of mark sweep class unloading may happen and as a
1577 // result some nmethods may get unloaded. In this case the flushing
1578 // of dependencies must happen during phase 1 since after GC any
1579 // dependencies in the unloaded nmethod won't be updated, so
1580 // traversing the dependency information in unsafe. In that case this
1581 // function is called with a non-NULL argument and this function only
1582 // notifies instanceKlasses that are reachable
1583
1584 void nmethod::flush_dependencies(BoolObjectClosure* is_alive) {
1585 assert_locked_or_safepoint(CodeCache_lock);
1586 assert(Universe::heap()->is_gc_active() == (is_alive != NULL),
1587 "is_alive is non-NULL if and only if we are called during GC");
1588 if (!has_flushed_dependencies()) {
1589 set_has_flushed_dependencies();
1590 for (Dependencies::DepStream deps(this); deps.next(); ) {
1591 if (deps.type() == Dependencies::call_site_target_value) {
1592 // CallSite dependencies are managed on per-CallSite instance basis.
1593 oop call_site = deps.argument_oop(0);
1594 MethodHandles::remove_dependent_nmethod(call_site, this);
1595 } else {
1596 Klass* klass = deps.context_type();
1597 if (klass == NULL) {
1598 continue; // ignore things like evol_method
1599 }
1600 // During GC the is_alive closure is non-NULL, and is used to
1601 // determine liveness of dependees that need to be updated.
1602 if (is_alive == NULL || klass->is_loader_alive(is_alive)) {
1603 // The GC defers deletion of this entry, since there might be multiple threads
1604 // iterating over the _dependencies graph. Other call paths are single-threaded
1605 // and may delete it immediately.
1606 bool delete_immediately = is_alive == NULL;
1607 InstanceKlass::cast(klass)->remove_dependent_nmethod(this, delete_immediately);
1608 }
1609 }
1610 }
1611 }
1612 }
1613
1614
1615 // If this oop is not live, the nmethod can be unloaded.
1616 bool nmethod::can_unload(BoolObjectClosure* is_alive, oop* root, bool unloading_occurred) {
1617 assert(root != NULL, "just checking");
1618 oop obj = *root;
1619 if (obj == NULL || is_alive->do_object_b(obj)) {
1620 return false;
1621 }
1622
1623 // If ScavengeRootsInCode is true, an nmethod might be unloaded
1624 // simply because one of its constant oops has gone dead.
1625 // No actual classes need to be unloaded in order for this to occur.
1626 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading");
1627 make_unloaded(is_alive, obj);
1628 return true;
1629 }
1630
1631 // ------------------------------------------------------------------
1632 // post_compiled_method_load_event
1633 // new method for install_code() path
1634 // Transfer information from compilation to jvmti
1635 void nmethod::post_compiled_method_load_event() {
1636
1637 Method* moop = method();
1638 HOTSPOT_COMPILED_METHOD_LOAD(
1639 (char *) moop->klass_name()->bytes(),
1640 moop->klass_name()->utf8_length(),
1641 (char *) moop->name()->bytes(),
1642 moop->name()->utf8_length(),
1643 (char *) moop->signature()->bytes(),
1644 moop->signature()->utf8_length(),
1645 insts_begin(), insts_size());
1646
1647 if (JvmtiExport::should_post_compiled_method_load() ||
1648 JvmtiExport::should_post_compiled_method_unload()) {
1649 get_and_cache_jmethod_id();
1650 }
1651
1652 if (JvmtiExport::should_post_compiled_method_load()) {
1653 // Let the Service thread (which is a real Java thread) post the event
1654 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1655 JvmtiDeferredEventQueue::enqueue(
1656 JvmtiDeferredEvent::compiled_method_load_event(this));
1657 }
1658 }
1659
1660 jmethodID nmethod::get_and_cache_jmethod_id() {
1661 if (_jmethod_id == NULL) {
1662 // Cache the jmethod_id since it can no longer be looked up once the
1663 // method itself has been marked for unloading.
1664 _jmethod_id = method()->jmethod_id();
1665 }
1666 return _jmethod_id;
1667 }
1668
1669 void nmethod::post_compiled_method_unload() {
1670 if (unload_reported()) {
1671 // During unloading we transition to unloaded and then to zombie
1672 // and the unloading is reported during the first transition.
1673 return;
1674 }
1675
1676 assert(_method != NULL && !is_unloaded(), "just checking");
1677 DTRACE_METHOD_UNLOAD_PROBE(method());
1678
1679 // If a JVMTI agent has enabled the CompiledMethodUnload event then
1680 // post the event. Sometime later this nmethod will be made a zombie
1681 // by the sweeper but the Method* will not be valid at that point.
1682 // If the _jmethod_id is null then no load event was ever requested
1683 // so don't bother posting the unload. The main reason for this is
1684 // that the jmethodID is a weak reference to the Method* so if
1685 // it's being unloaded there's no way to look it up since the weak
1686 // ref will have been cleared.
1687 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) {
1688 assert(!unload_reported(), "already unloaded");
1689 JvmtiDeferredEvent event =
1690 JvmtiDeferredEvent::compiled_method_unload_event(this,
1691 _jmethod_id, insts_begin());
1692 if (SafepointSynchronize::is_at_safepoint()) {
1693 // Don't want to take the queueing lock. Add it as pending and
1694 // it will get enqueued later.
1695 JvmtiDeferredEventQueue::add_pending_event(event);
1696 } else {
1697 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1698 JvmtiDeferredEventQueue::enqueue(event);
1699 }
1700 }
1701
1702 // The JVMTI CompiledMethodUnload event can be enabled or disabled at
1703 // any time. As the nmethod is being unloaded now we mark it has
1704 // having the unload event reported - this will ensure that we don't
1705 // attempt to report the event in the unlikely scenario where the
1706 // event is enabled at the time the nmethod is made a zombie.
1707 set_unload_reported();
1708 }
1709
1710 void static clean_ic_if_metadata_is_dead(CompiledIC *ic, BoolObjectClosure *is_alive) {
1711 if (ic->is_icholder_call()) {
1712 // The only exception is compiledICHolder oops which may
1713 // yet be marked below. (We check this further below).
1714 CompiledICHolder* cichk_oop = ic->cached_icholder();
1715
1716 if (cichk_oop->holder_method()->method_holder()->is_loader_alive(is_alive) &&
1717 cichk_oop->holder_klass()->is_loader_alive(is_alive)) {
1718 return;
1719 }
1720 } else {
1721 Metadata* ic_oop = ic->cached_metadata();
1722 if (ic_oop != NULL) {
1723 if (ic_oop->is_klass()) {
1724 if (((Klass*)ic_oop)->is_loader_alive(is_alive)) {
1725 return;
1726 }
1727 } else if (ic_oop->is_method()) {
1728 if (((Method*)ic_oop)->method_holder()->is_loader_alive(is_alive)) {
1729 return;
1730 }
1731 } else {
1732 ShouldNotReachHere();
1733 }
1734 }
1735 }
1736
1737 ic->set_to_clean();
1738 }
1739
1740 // This is called at the end of the strong tracing/marking phase of a
1741 // GC to unload an nmethod if it contains otherwise unreachable
1742 // oops.
1743
1744 void nmethod::do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred) {
1745 // Make sure the oop's ready to receive visitors
1746 assert(!is_zombie() && !is_unloaded(),
1747 "should not call follow on zombie or unloaded nmethod");
1748
1749 // If the method is not entrant then a JMP is plastered over the
1750 // first few bytes. If an oop in the old code was there, that oop
1751 // should not get GC'd. Skip the first few bytes of oops on
1752 // not-entrant methods.
1753 address low_boundary = verified_entry_point();
1754 if (is_not_entrant()) {
1755 low_boundary += NativeJump::instruction_size;
1756 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1757 // (See comment above.)
1758 }
1759
1760 // The RedefineClasses() API can cause the class unloading invariant
1761 // to no longer be true. See jvmtiExport.hpp for details.
1762 // Also, leave a debugging breadcrumb in local flag.
1763 if (JvmtiExport::has_redefined_a_class()) {
1764 // This set of the unloading_occurred flag is done before the
1765 // call to post_compiled_method_unload() so that the unloading
1766 // of this nmethod is reported.
1767 unloading_occurred = true;
1768 }
1769
1770 // Exception cache
1771 clean_exception_cache(is_alive);
1772
1773 // If class unloading occurred we first iterate over all inline caches and
1774 // clear ICs where the cached oop is referring to an unloaded klass or method.
1775 // The remaining live cached oops will be traversed in the relocInfo::oop_type
1776 // iteration below.
1777 if (unloading_occurred) {
1778 RelocIterator iter(this, low_boundary);
1779 while(iter.next()) {
1780 if (iter.type() == relocInfo::virtual_call_type) {
1781 CompiledIC *ic = CompiledIC_at(&iter);
1782 clean_ic_if_metadata_is_dead(ic, is_alive);
1783 }
1784 }
1785 }
1786
1787 // Compiled code
1788 {
1789 RelocIterator iter(this, low_boundary);
1790 while (iter.next()) {
1791 if (iter.type() == relocInfo::oop_type) {
1792 oop_Relocation* r = iter.oop_reloc();
1793 // In this loop, we must only traverse those oops directly embedded in
1794 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1795 assert(1 == (r->oop_is_immediate()) +
1796 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1797 "oop must be found in exactly one place");
1798 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1799 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) {
1800 return;
1801 }
1802 }
1803 }
1804 }
1805 }
1806
1807
1808 // Scopes
1809 for (oop* p = oops_begin(); p < oops_end(); p++) {
1810 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1811 if (can_unload(is_alive, p, unloading_occurred)) {
1812 return;
1813 }
1814 }
1815
1816 #if INCLUDE_JVMCI
1817 // Follow JVMCI method
1818 BarrierSet* bs = Universe::heap()->barrier_set();
1819 if (_jvmci_installed_code != NULL) {
1820 if (_jvmci_installed_code->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(_jvmci_installed_code)) {
1821 if (!is_alive->do_object_b(_jvmci_installed_code)) {
1822 clear_jvmci_installed_code();
1823 }
1824 } else {
1825 if (can_unload(is_alive, (oop*)&_jvmci_installed_code, unloading_occurred)) {
1826 return;
1827 }
1828 }
1829 }
1830
1831 if (_speculation_log != NULL) {
1832 if (!is_alive->do_object_b(_speculation_log)) {
1833 bs->write_ref_nmethod_pre(&_speculation_log, this);
1834 _speculation_log = NULL;
1835 bs->write_ref_nmethod_post(&_speculation_log, this);
1836 }
1837 }
1838 #endif
1839
1840
1841 // Ensure that all metadata is still alive
1842 verify_metadata_loaders(low_boundary, is_alive);
1843 }
1844
1845 template <class CompiledICorStaticCall>
1846 static bool clean_if_nmethod_is_unloaded(CompiledICorStaticCall *ic, address addr, BoolObjectClosure *is_alive, nmethod* from) {
1847 // Ok, to lookup references to zombies here
1848 CodeBlob *cb = CodeCache::find_blob_unsafe(addr);
1849 if (cb != NULL && cb->is_nmethod()) {
1850 nmethod* nm = (nmethod*)cb;
1851
1852 if (nm->unloading_clock() != nmethod::global_unloading_clock()) {
1853 // The nmethod has not been processed yet.
1854 return true;
1855 }
1856
1857 // Clean inline caches pointing to both zombie and not_entrant methods
1858 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1859 ic->set_to_clean();
1860 assert(ic->is_clean(), "nmethod " PTR_FORMAT "not clean %s", p2i(from), from->method()->name_and_sig_as_C_string());
1861 }
1862 }
1863
1864 return false;
1865 }
1866
1867 static bool clean_if_nmethod_is_unloaded(CompiledIC *ic, BoolObjectClosure *is_alive, nmethod* from) {
1868 return clean_if_nmethod_is_unloaded(ic, ic->ic_destination(), is_alive, from);
1869 }
1870
1871 static bool clean_if_nmethod_is_unloaded(CompiledStaticCall *csc, BoolObjectClosure *is_alive, nmethod* from) {
1872 return clean_if_nmethod_is_unloaded(csc, csc->destination(), is_alive, from);
1873 }
1874
1875 bool nmethod::unload_if_dead_at(RelocIterator* iter_at_oop, BoolObjectClosure *is_alive, bool unloading_occurred) {
1876 assert(iter_at_oop->type() == relocInfo::oop_type, "Wrong relocation type");
1877
1878 oop_Relocation* r = iter_at_oop->oop_reloc();
1879 // Traverse those oops directly embedded in the code.
1880 // Other oops (oop_index>0) are seen as part of scopes_oops.
1881 assert(1 == (r->oop_is_immediate()) +
1882 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1883 "oop must be found in exactly one place");
1884 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1885 // Unload this nmethod if the oop is dead.
1886 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) {
1887 return true;;
1888 }
1889 }
1890
1891 return false;
1892 }
1893
1894
1895 bool nmethod::do_unloading_parallel(BoolObjectClosure* is_alive, bool unloading_occurred) {
1896 ResourceMark rm;
1897
1898 // Make sure the oop's ready to receive visitors
1899 assert(!is_zombie() && !is_unloaded(),
1900 "should not call follow on zombie or unloaded nmethod");
1901
1902 // If the method is not entrant then a JMP is plastered over the
1903 // first few bytes. If an oop in the old code was there, that oop
1904 // should not get GC'd. Skip the first few bytes of oops on
1905 // not-entrant methods.
1906 address low_boundary = verified_entry_point();
1907 if (is_not_entrant()) {
1908 low_boundary += NativeJump::instruction_size;
1909 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1910 // (See comment above.)
1911 }
1912
1913 // The RedefineClasses() API can cause the class unloading invariant
1914 // to no longer be true. See jvmtiExport.hpp for details.
1915 // Also, leave a debugging breadcrumb in local flag.
1916 if (JvmtiExport::has_redefined_a_class()) {
1917 // This set of the unloading_occurred flag is done before the
1918 // call to post_compiled_method_unload() so that the unloading
1919 // of this nmethod is reported.
1920 unloading_occurred = true;
1921 }
1922
1923 // Exception cache
1924 clean_exception_cache(is_alive);
1925
1926 bool is_unloaded = false;
1927 bool postponed = false;
1928
1929 RelocIterator iter(this, low_boundary);
1930 while(iter.next()) {
1931
1932 switch (iter.type()) {
1933
1934 case relocInfo::virtual_call_type:
1935 if (unloading_occurred) {
1936 // If class unloading occurred we first iterate over all inline caches and
1937 // clear ICs where the cached oop is referring to an unloaded klass or method.
1938 clean_ic_if_metadata_is_dead(CompiledIC_at(&iter), is_alive);
1939 }
1940
1941 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
1942 break;
1943
1944 case relocInfo::opt_virtual_call_type:
1945 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
1946 break;
1947
1948 case relocInfo::static_call_type:
1949 postponed |= clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this);
1950 break;
1951
1952 case relocInfo::oop_type:
1953 if (!is_unloaded) {
1954 is_unloaded = unload_if_dead_at(&iter, is_alive, unloading_occurred);
1955 }
1956 break;
1957
1958 case relocInfo::metadata_type:
1959 break; // nothing to do.
1960 }
1961 }
1962
1963 if (is_unloaded) {
1964 return postponed;
1965 }
1966
1967 // Scopes
1968 for (oop* p = oops_begin(); p < oops_end(); p++) {
1969 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1970 if (can_unload(is_alive, p, unloading_occurred)) {
1971 is_unloaded = true;
1972 break;
1973 }
1974 }
1975
1976 if (is_unloaded) {
1977 return postponed;
1978 }
1979
1980 #if INCLUDE_JVMCI
1981 // Follow JVMCI method
1982 BarrierSet* bs = Universe::heap()->barrier_set();
1983 if (_jvmci_installed_code != NULL) {
1984 if (_jvmci_installed_code->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(_jvmci_installed_code)) {
1985 if (!is_alive->do_object_b(_jvmci_installed_code)) {
1986 clear_jvmci_installed_code();
1987 }
1988 } else {
1989 if (can_unload(is_alive, (oop*)&_jvmci_installed_code, unloading_occurred)) {
1990 is_unloaded = true;
1991 }
1992 }
1993 }
1994
1995 if (_speculation_log != NULL) {
1996 if (!is_alive->do_object_b(_speculation_log)) {
1997 bs->write_ref_nmethod_pre(&_speculation_log, this);
1998 _speculation_log = NULL;
1999 bs->write_ref_nmethod_post(&_speculation_log, this);
2000 }
2001 }
2002 #endif
2003
2004 // Ensure that all metadata is still alive
2005 verify_metadata_loaders(low_boundary, is_alive);
2006
2007 return postponed;
2008 }
2009
2010 void nmethod::do_unloading_parallel_postponed(BoolObjectClosure* is_alive, bool unloading_occurred) {
2011 ResourceMark rm;
2012
2013 // Make sure the oop's ready to receive visitors
2014 assert(!is_zombie(),
2015 "should not call follow on zombie nmethod");
2016
2017 // If the method is not entrant then a JMP is plastered over the
2018 // first few bytes. If an oop in the old code was there, that oop
2019 // should not get GC'd. Skip the first few bytes of oops on
2020 // not-entrant methods.
2021 address low_boundary = verified_entry_point();
2022 if (is_not_entrant()) {
2023 low_boundary += NativeJump::instruction_size;
2024 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
2025 // (See comment above.)
2026 }
2027
2028 RelocIterator iter(this, low_boundary);
2029 while(iter.next()) {
2030
2031 switch (iter.type()) {
2032
2033 case relocInfo::virtual_call_type:
2034 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
2035 break;
2036
2037 case relocInfo::opt_virtual_call_type:
2038 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
2039 break;
2040
2041 case relocInfo::static_call_type:
2042 clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this);
2043 break;
2044 }
2045 }
2046 }
2047
2048 #ifdef ASSERT
2049
2050 class CheckClass : AllStatic {
2051 static BoolObjectClosure* _is_alive;
2052
2053 // Check class_loader is alive for this bit of metadata.
2054 static void check_class(Metadata* md) {
2055 Klass* klass = NULL;
2056 if (md->is_klass()) {
2057 klass = ((Klass*)md);
2058 } else if (md->is_method()) {
2059 klass = ((Method*)md)->method_holder();
2060 } else if (md->is_methodData()) {
2061 klass = ((MethodData*)md)->method()->method_holder();
2062 } else {
2063 md->print();
2064 ShouldNotReachHere();
2065 }
2066 assert(klass->is_loader_alive(_is_alive), "must be alive");
2067 }
2068 public:
2069 static void do_check_class(BoolObjectClosure* is_alive, nmethod* nm) {
2070 assert(SafepointSynchronize::is_at_safepoint(), "this is only ok at safepoint");
2071 _is_alive = is_alive;
2072 nm->metadata_do(check_class);
2073 }
2074 };
2075
2076 // This is called during a safepoint so can use static data
2077 BoolObjectClosure* CheckClass::_is_alive = NULL;
2078 #endif // ASSERT
2079
2080
2081 // Processing of oop references should have been sufficient to keep
2082 // all strong references alive. Any weak references should have been
2083 // cleared as well. Visit all the metadata and ensure that it's
2084 // really alive.
2085 void nmethod::verify_metadata_loaders(address low_boundary, BoolObjectClosure* is_alive) {
2086 #ifdef ASSERT
2087 RelocIterator iter(this, low_boundary);
2088 while (iter.next()) {
2089 // static_stub_Relocations may have dangling references to
2090 // Method*s so trim them out here. Otherwise it looks like
2091 // compiled code is maintaining a link to dead metadata.
2092 address static_call_addr = NULL;
2093 if (iter.type() == relocInfo::opt_virtual_call_type) {
2094 CompiledIC* cic = CompiledIC_at(&iter);
2095 if (!cic->is_call_to_interpreted()) {
2096 static_call_addr = iter.addr();
2097 }
2098 } else if (iter.type() == relocInfo::static_call_type) {
2099 CompiledStaticCall* csc = compiledStaticCall_at(iter.reloc());
2100 if (!csc->is_call_to_interpreted()) {
2101 static_call_addr = iter.addr();
2102 }
2103 }
2104 if (static_call_addr != NULL) {
2105 RelocIterator sciter(this, low_boundary);
2106 while (sciter.next()) {
2107 if (sciter.type() == relocInfo::static_stub_type &&
2108 sciter.static_stub_reloc()->static_call() == static_call_addr) {
2109 sciter.static_stub_reloc()->clear_inline_cache();
2110 }
2111 }
2112 }
2113 }
2114 // Check that the metadata embedded in the nmethod is alive
2115 CheckClass::do_check_class(is_alive, this);
2116 #endif
2117 }
2118
2119
2120 // Iterate over metadata calling this function. Used by RedefineClasses
2121 void nmethod::metadata_do(void f(Metadata*)) {
2122 address low_boundary = verified_entry_point();
2123 if (is_not_entrant()) {
2124 low_boundary += NativeJump::instruction_size;
2125 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
2126 // (See comment above.)
2127 }
2128 {
2129 // Visit all immediate references that are embedded in the instruction stream.
2130 RelocIterator iter(this, low_boundary);
2131 while (iter.next()) {
2132 if (iter.type() == relocInfo::metadata_type ) {
2133 metadata_Relocation* r = iter.metadata_reloc();
2134 // In this metadata, we must only follow those metadatas directly embedded in
2135 // the code. Other metadatas (oop_index>0) are seen as part of
2136 // the metadata section below.
2137 assert(1 == (r->metadata_is_immediate()) +
2138 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
2139 "metadata must be found in exactly one place");
2140 if (r->metadata_is_immediate() && r->metadata_value() != NULL) {
2141 Metadata* md = r->metadata_value();
2142 if (md != _method) f(md);
2143 }
2144 } else if (iter.type() == relocInfo::virtual_call_type) {
2145 // Check compiledIC holders associated with this nmethod
2146 CompiledIC *ic = CompiledIC_at(&iter);
2147 if (ic->is_icholder_call()) {
2148 CompiledICHolder* cichk = ic->cached_icholder();
2149 f(cichk->holder_method());
2150 f(cichk->holder_klass());
2151 } else {
2152 Metadata* ic_oop = ic->cached_metadata();
2153 if (ic_oop != NULL) {
2154 f(ic_oop);
2155 }
2156 }
2157 }
2158 }
2159 }
2160
2161 // Visit the metadata section
2162 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
2163 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops
2164 Metadata* md = *p;
2165 f(md);
2166 }
2167
2168 // Visit metadata not embedded in the other places.
2169 if (_method != NULL) f(_method);
2170 }
2171
2172 void nmethod::oops_do(OopClosure* f, bool allow_zombie) {
2173 // make sure the oops ready to receive visitors
2174 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod");
2175 assert(!is_unloaded(), "should not call follow on unloaded nmethod");
2176
2177 // If the method is not entrant or zombie then a JMP is plastered over the
2178 // first few bytes. If an oop in the old code was there, that oop
2179 // should not get GC'd. Skip the first few bytes of oops on
2180 // not-entrant methods.
2181 address low_boundary = verified_entry_point();
2182 if (is_not_entrant()) {
2183 low_boundary += NativeJump::instruction_size;
2184 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
2185 // (See comment above.)
2186 }
2187
2188 #if INCLUDE_JVMCI
2189 if (_jvmci_installed_code != NULL) {
2190 f->do_oop((oop*) &_jvmci_installed_code);
2191 }
2192 if (_speculation_log != NULL) {
2193 f->do_oop((oop*) &_speculation_log);
2194 }
2195 #endif
2196
2197 RelocIterator iter(this, low_boundary);
2198
2199 while (iter.next()) {
2200 if (iter.type() == relocInfo::oop_type ) {
2201 oop_Relocation* r = iter.oop_reloc();
2202 // In this loop, we must only follow those oops directly embedded in
2203 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
2204 assert(1 == (r->oop_is_immediate()) +
2205 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
2206 "oop must be found in exactly one place");
2207 if (r->oop_is_immediate() && r->oop_value() != NULL) {
2208 f->do_oop(r->oop_addr());
2209 }
2210 }
2211 }
2212
2213 // Scopes
2214 // This includes oop constants not inlined in the code stream.
2215 for (oop* p = oops_begin(); p < oops_end(); p++) {
2216 if (*p == Universe::non_oop_word()) continue; // skip non-oops
2217 f->do_oop(p);
2218 }
2219 }
2220
2221 #define NMETHOD_SENTINEL ((nmethod*)badAddress)
2222
2223 nmethod* volatile nmethod::_oops_do_mark_nmethods;
2224
2225 // An nmethod is "marked" if its _mark_link is set non-null.
2226 // Even if it is the end of the linked list, it will have a non-null link value,
2227 // as long as it is on the list.
2228 // This code must be MP safe, because it is used from parallel GC passes.
2229 bool nmethod::test_set_oops_do_mark() {
2230 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");
2231 nmethod* observed_mark_link = _oops_do_mark_link;
2232 if (observed_mark_link == NULL) {
2233 // Claim this nmethod for this thread to mark.
2234 observed_mark_link = (nmethod*)
2235 Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_link, NULL);
2236 if (observed_mark_link == NULL) {
2237
2238 // Atomically append this nmethod (now claimed) to the head of the list:
2239 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods;
2240 for (;;) {
2241 nmethod* required_mark_nmethods = observed_mark_nmethods;
2242 _oops_do_mark_link = required_mark_nmethods;
2243 observed_mark_nmethods = (nmethod*)
2244 Atomic::cmpxchg_ptr(this, &_oops_do_mark_nmethods, required_mark_nmethods);
2245 if (observed_mark_nmethods == required_mark_nmethods)
2246 break;
2247 }
2248 // Mark was clear when we first saw this guy.
2249 if (TraceScavenge) { print_on(tty, "oops_do, mark"); }
2250 return false;
2251 }
2252 }
2253 // On fall through, another racing thread marked this nmethod before we did.
2254 return true;
2255 }
2256
2257 void nmethod::oops_do_marking_prologue() {
2258 if (TraceScavenge) { tty->print_cr("[oops_do_marking_prologue"); }
2259 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row");
2260 // We use cmpxchg_ptr instead of regular assignment here because the user
2261 // may fork a bunch of threads, and we need them all to see the same state.
2262 void* observed = Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, NULL);
2263 guarantee(observed == NULL, "no races in this sequential code");
2264 }
2265
2266 void nmethod::oops_do_marking_epilogue() {
2267 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row");
2268 nmethod* cur = _oops_do_mark_nmethods;
2269 while (cur != NMETHOD_SENTINEL) {
2270 assert(cur != NULL, "not NULL-terminated");
2271 nmethod* next = cur->_oops_do_mark_link;
2272 cur->_oops_do_mark_link = NULL;
2273 DEBUG_ONLY(cur->verify_oop_relocations());
2274 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark"));
2275 cur = next;
2276 }
2277 void* required = _oops_do_mark_nmethods;
2278 void* observed = Atomic::cmpxchg_ptr(NULL, &_oops_do_mark_nmethods, required);
2279 guarantee(observed == required, "no races in this sequential code");
2280 if (TraceScavenge) { tty->print_cr("oops_do_marking_epilogue]"); }
2281 }
2282
2283 class DetectScavengeRoot: public OopClosure {
2284 bool _detected_scavenge_root;
2285 public:
2286 DetectScavengeRoot() : _detected_scavenge_root(false)
2287 { NOT_PRODUCT(_print_nm = NULL); }
2288 bool detected_scavenge_root() { return _detected_scavenge_root; }
2289 virtual void do_oop(oop* p) {
2290 if ((*p) != NULL && (*p)->is_scavengable()) {
2291 NOT_PRODUCT(maybe_print(p));
2292 _detected_scavenge_root = true;
2293 }
2294 }
2295 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2296
2297 #ifndef PRODUCT
2298 nmethod* _print_nm;
2299 void maybe_print(oop* p) {
2300 if (_print_nm == NULL) return;
2301 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root");
2302 tty->print_cr("" PTR_FORMAT "[offset=%d] detected scavengable oop " PTR_FORMAT " (found at " PTR_FORMAT ")",
2303 p2i(_print_nm), (int)((intptr_t)p - (intptr_t)_print_nm),
2304 p2i(*p), p2i(p));
2305 (*p)->print();
2306 }
2307 #endif //PRODUCT
2308 };
2309
2310 bool nmethod::detect_scavenge_root_oops() {
2311 DetectScavengeRoot detect_scavenge_root;
2312 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this);
2313 oops_do(&detect_scavenge_root);
2314 return detect_scavenge_root.detected_scavenge_root();
2315 }
2316
2317 // Method that knows how to preserve outgoing arguments at call. This method must be
2318 // called with a frame corresponding to a Java invoke
2319 void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) {
2320 #ifndef SHARK
2321 if (method() != NULL && !method()->is_native()) {
2322 SimpleScopeDesc ssd(this, fr.pc());
2323 Bytecode_invoke call(ssd.method(), ssd.bci());
2324 bool has_receiver = call.has_receiver();
2325 bool has_appendix = call.has_appendix();
2326 Symbol* signature = call.signature();
2327 fr.oops_compiled_arguments_do(signature, has_receiver, has_appendix, reg_map, f);
2328 }
2329 #endif // !SHARK
2330 }
2331
2332 inline bool includes(void* p, void* from, void* to) {
2333 return from <= p && p < to;
2334 }
2335
2336
2337 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
2338 assert(count >= 2, "must be sentinel values, at least");
2339
2340 #ifdef ASSERT
2341 // must be sorted and unique; we do a binary search in find_pc_desc()
2342 int prev_offset = pcs[0].pc_offset();
2343 assert(prev_offset == PcDesc::lower_offset_limit,
2344 "must start with a sentinel");
2345 for (int i = 1; i < count; i++) {
2346 int this_offset = pcs[i].pc_offset();
2347 assert(this_offset > prev_offset, "offsets must be sorted");
2348 prev_offset = this_offset;
2349 }
2350 assert(prev_offset == PcDesc::upper_offset_limit,
2351 "must end with a sentinel");
2352 #endif //ASSERT
2353
2354 // Search for MethodHandle invokes and tag the nmethod.
2355 for (int i = 0; i < count; i++) {
2356 if (pcs[i].is_method_handle_invoke()) {
2357 set_has_method_handle_invokes(true);
2358 break;
2359 }
2360 }
2361 assert(has_method_handle_invokes() == (_deoptimize_mh_offset != -1), "must have deopt mh handler");
2362
2363 int size = count * sizeof(PcDesc);
2364 assert(scopes_pcs_size() >= size, "oob");
2365 memcpy(scopes_pcs_begin(), pcs, size);
2366
2367 // Adjust the final sentinel downward.
2368 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
2369 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
2370 last_pc->set_pc_offset(content_size() + 1);
2371 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
2372 // Fill any rounding gaps with copies of the last record.
2373 last_pc[1] = last_pc[0];
2374 }
2375 // The following assert could fail if sizeof(PcDesc) is not
2376 // an integral multiple of oopSize (the rounding term).
2377 // If it fails, change the logic to always allocate a multiple
2378 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
2379 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
2380 }
2381
2382 void nmethod::copy_scopes_data(u_char* buffer, int size) {
2383 assert(scopes_data_size() >= size, "oob");
2384 memcpy(scopes_data_begin(), buffer, size);
2385 }
2386
2387 // When using JVMCI the address might be off by the size of a call instruction.
2388 bool nmethod::is_deopt_entry(address pc) {
2389 return pc == deopt_handler_begin()
2390 #if INCLUDE_JVMCI
2391 || pc == (deopt_handler_begin() + NativeCall::instruction_size)
2392 #endif
2393 ;
2394 }
2395
2396 #ifdef ASSERT
2397 static PcDesc* linear_search(nmethod* nm, int pc_offset, bool approximate) {
2398 PcDesc* lower = nm->scopes_pcs_begin();
2399 PcDesc* upper = nm->scopes_pcs_end();
2400 lower += 1; // exclude initial sentinel
2401 PcDesc* res = NULL;
2402 for (PcDesc* p = lower; p < upper; p++) {
2403 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc
2404 if (match_desc(p, pc_offset, approximate)) {
2405 if (res == NULL)
2406 res = p;
2407 else
2408 res = (PcDesc*) badAddress;
2409 }
2410 }
2411 return res;
2412 }
2413 #endif
2414
2415
2416 // Finds a PcDesc with real-pc equal to "pc"
2417 PcDesc* nmethod::find_pc_desc_internal(address pc, bool approximate) {
2418 address base_address = code_begin();
2419 if ((pc < base_address) ||
2420 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
2421 return NULL; // PC is wildly out of range
2422 }
2423 int pc_offset = (int) (pc - base_address);
2424
2425 // Check the PcDesc cache if it contains the desired PcDesc
2426 // (This as an almost 100% hit rate.)
2427 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
2428 if (res != NULL) {
2429 assert(res == linear_search(this, pc_offset, approximate), "cache ok");
2430 return res;
2431 }
2432
2433 // Fallback algorithm: quasi-linear search for the PcDesc
2434 // Find the last pc_offset less than the given offset.
2435 // The successor must be the required match, if there is a match at all.
2436 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
2437 PcDesc* lower = scopes_pcs_begin();
2438 PcDesc* upper = scopes_pcs_end();
2439 upper -= 1; // exclude final sentinel
2440 if (lower >= upper) return NULL; // native method; no PcDescs at all
2441
2442 #define assert_LU_OK \
2443 /* invariant on lower..upper during the following search: */ \
2444 assert(lower->pc_offset() < pc_offset, "sanity"); \
2445 assert(upper->pc_offset() >= pc_offset, "sanity")
2446 assert_LU_OK;
2447
2448 // Use the last successful return as a split point.
2449 PcDesc* mid = _pc_desc_cache.last_pc_desc();
2450 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
2451 if (mid->pc_offset() < pc_offset) {
2452 lower = mid;
2453 } else {
2454 upper = mid;
2455 }
2456
2457 // Take giant steps at first (4096, then 256, then 16, then 1)
2458 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
2459 const int RADIX = (1 << LOG2_RADIX);
2460 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
2461 while ((mid = lower + step) < upper) {
2462 assert_LU_OK;
2463 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
2464 if (mid->pc_offset() < pc_offset) {
2465 lower = mid;
2466 } else {
2467 upper = mid;
2468 break;
2469 }
2470 }
2471 assert_LU_OK;
2472 }
2473
2474 // Sneak up on the value with a linear search of length ~16.
2475 while (true) {
2476 assert_LU_OK;
2477 mid = lower + 1;
2478 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
2479 if (mid->pc_offset() < pc_offset) {
2480 lower = mid;
2481 } else {
2482 upper = mid;
2483 break;
2484 }
2485 }
2486 #undef assert_LU_OK
2487
2488 if (match_desc(upper, pc_offset, approximate)) {
2489 assert(upper == linear_search(this, pc_offset, approximate), "search ok");
2490 _pc_desc_cache.add_pc_desc(upper);
2491 return upper;
2492 } else {
2493 assert(NULL == linear_search(this, pc_offset, approximate), "search ok");
2494 return NULL;
2495 }
2496 }
2497
2498
2499 void nmethod::check_all_dependencies(DepChange& changes) {
2500 // Checked dependencies are allocated into this ResourceMark
2501 ResourceMark rm;
2502
2503 // Turn off dependency tracing while actually testing dependencies.
2504 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) );
2505
2506 typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash,
2507 &DependencySignature::equals, 11027> DepTable;
2508
2509 DepTable* table = new DepTable();
2510
2511 // Iterate over live nmethods and check dependencies of all nmethods that are not
2512 // marked for deoptimization. A particular dependency is only checked once.
2513 NMethodIterator iter;
2514 while(iter.next()) {
2515 nmethod* nm = iter.method();
2516 // Only notify for live nmethods
2517 if (nm->is_alive() && !nm->is_marked_for_deoptimization()) {
2518 for (Dependencies::DepStream deps(nm); deps.next(); ) {
2519 // Construct abstraction of a dependency.
2520 DependencySignature* current_sig = new DependencySignature(deps);
2521
2522 // Determine if dependency is already checked. table->put(...) returns
2523 // 'true' if the dependency is added (i.e., was not in the hashtable).
2524 if (table->put(*current_sig, 1)) {
2525 if (deps.check_dependency() != NULL) {
2526 // Dependency checking failed. Print out information about the failed
2527 // dependency and finally fail with an assert. We can fail here, since
2528 // dependency checking is never done in a product build.
2529 tty->print_cr("Failed dependency:");
2530 changes.print();
2531 nm->print();
2532 nm->print_dependencies();
2533 assert(false, "Should have been marked for deoptimization");
2534 }
2535 }
2536 }
2537 }
2538 }
2539 }
2540
2541 bool nmethod::check_dependency_on(DepChange& changes) {
2542 // What has happened:
2543 // 1) a new class dependee has been added
2544 // 2) dependee and all its super classes have been marked
2545 bool found_check = false; // set true if we are upset
2546 for (Dependencies::DepStream deps(this); deps.next(); ) {
2547 // Evaluate only relevant dependencies.
2548 if (deps.spot_check_dependency_at(changes) != NULL) {
2549 found_check = true;
2550 NOT_DEBUG(break);
2551 }
2552 }
2553 return found_check;
2554 }
2555
2556 bool nmethod::is_evol_dependent_on(Klass* dependee) {
2557 InstanceKlass *dependee_ik = InstanceKlass::cast(dependee);
2558 Array<Method*>* dependee_methods = dependee_ik->methods();
2559 for (Dependencies::DepStream deps(this); deps.next(); ) {
2560 if (deps.type() == Dependencies::evol_method) {
2561 Method* method = deps.method_argument(0);
2562 for (int j = 0; j < dependee_methods->length(); j++) {
2563 if (dependee_methods->at(j) == method) {
2564 // RC_TRACE macro has an embedded ResourceMark
2565 RC_TRACE(0x01000000,
2566 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)",
2567 _method->method_holder()->external_name(),
2568 _method->name()->as_C_string(),
2569 _method->signature()->as_C_string(), compile_id(),
2570 method->method_holder()->external_name(),
2571 method->name()->as_C_string(),
2572 method->signature()->as_C_string()));
2573 if (TraceDependencies || LogCompilation)
2574 deps.log_dependency(dependee);
2575 return true;
2576 }
2577 }
2578 }
2579 }
2580 return false;
2581 }
2582
2583 // Called from mark_for_deoptimization, when dependee is invalidated.
2584 bool nmethod::is_dependent_on_method(Method* dependee) {
2585 for (Dependencies::DepStream deps(this); deps.next(); ) {
2586 if (deps.type() != Dependencies::evol_method)
2587 continue;
2588 Method* method = deps.method_argument(0);
2589 if (method == dependee) return true;
2590 }
2591 return false;
2592 }
2593
2594
2595 bool nmethod::is_patchable_at(address instr_addr) {
2596 assert(insts_contains(instr_addr), "wrong nmethod used");
2597 if (is_zombie()) {
2598 // a zombie may never be patched
2599 return false;
2600 }
2601 return true;
2602 }
2603
2604
2605 address nmethod::continuation_for_implicit_exception(address pc) {
2606 // Exception happened outside inline-cache check code => we are inside
2607 // an active nmethod => use cpc to determine a return address
2608 int exception_offset = pc - code_begin();
2609 int cont_offset = ImplicitExceptionTable(this).at( exception_offset );
2610 #ifdef ASSERT
2611 if (cont_offset == 0) {
2612 Thread* thread = ThreadLocalStorage::get_thread_slow();
2613 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
2614 HandleMark hm(thread);
2615 ResourceMark rm(thread);
2616 CodeBlob* cb = CodeCache::find_blob(pc);
2617 assert(cb != NULL && cb == this, "");
2618 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, p2i(pc));
2619 print();
2620 method()->print_codes();
2621 print_code();
2622 print_pcs();
2623 }
2624 #endif
2625 if (cont_offset == 0) {
2626 // Let the normal error handling report the exception
2627 return NULL;
2628 }
2629 return code_begin() + cont_offset;
2630 }
2631
2632
2633
2634 void nmethod_init() {
2635 // make sure you didn't forget to adjust the filler fields
2636 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
2637 }
2638
2639
2640 //-------------------------------------------------------------------------------------------
2641
2642
2643 // QQQ might we make this work from a frame??
2644 nmethodLocker::nmethodLocker(address pc) {
2645 CodeBlob* cb = CodeCache::find_blob(pc);
2646 guarantee(cb != NULL && cb->is_nmethod(), "bad pc for a nmethod found");
2647 _nm = (nmethod*)cb;
2648 lock_nmethod(_nm);
2649 }
2650
2651 // Only JvmtiDeferredEvent::compiled_method_unload_event()
2652 // should pass zombie_ok == true.
2653 void nmethodLocker::lock_nmethod(nmethod* nm, bool zombie_ok) {
2654 if (nm == NULL) return;
2655 Atomic::inc(&nm->_lock_count);
2656 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method");
2657 }
2658
2659 void nmethodLocker::unlock_nmethod(nmethod* nm) {
2660 if (nm == NULL) return;
2661 Atomic::dec(&nm->_lock_count);
2662 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock");
2663 }
2664
2665 // -----------------------------------------------------------------------------
2666 // nmethod::get_deopt_original_pc
2667 //
2668 // Return the original PC for the given PC if:
2669 // (a) the given PC belongs to a nmethod and
2670 // (b) it is a deopt PC
2671 address nmethod::get_deopt_original_pc(const frame* fr) {
2672 if (fr->cb() == NULL) return NULL;
2673
2674 nmethod* nm = fr->cb()->as_nmethod_or_null();
2675 if (nm != NULL && nm->is_deopt_pc(fr->pc()))
2676 return nm->get_original_pc(fr);
2677
2678 return NULL;
2679 }
2680
2681
2682 // -----------------------------------------------------------------------------
2683 // MethodHandle
2684
2685 bool nmethod::is_method_handle_return(address return_pc) {
2686 if (!has_method_handle_invokes()) return false;
2687 PcDesc* pd = pc_desc_at(return_pc);
2688 if (pd == NULL)
2689 return false;
2690 return pd->is_method_handle_invoke();
2691 }
2692
2693
2694 // -----------------------------------------------------------------------------
2695 // Verification
2696
2697 class VerifyOopsClosure: public OopClosure {
2698 nmethod* _nm;
2699 bool _ok;
2700 public:
2701 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
2702 bool ok() { return _ok; }
2703 virtual void do_oop(oop* p) {
2704 if ((*p) == NULL || (*p)->is_oop()) return;
2705 if (_ok) {
2706 _nm->print_nmethod(true);
2707 _ok = false;
2708 }
2709 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2710 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2711 }
2712 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2713 };
2714
2715 void nmethod::verify() {
2716
2717 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant
2718 // seems odd.
2719
2720 if (is_zombie() || is_not_entrant() || is_unloaded())
2721 return;
2722
2723 // Make sure all the entry points are correctly aligned for patching.
2724 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
2725
2726 // assert(method()->is_oop(), "must be valid");
2727
2728 ResourceMark rm;
2729
2730 if (!CodeCache::contains(this)) {
2731 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this));
2732 }
2733
2734 if(is_native_method() )
2735 return;
2736
2737 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
2738 if (nm != this) {
2739 fatal("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this));
2740 }
2741
2742 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2743 if (! p->verify(this)) {
2744 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this));
2745 }
2746 }
2747
2748 VerifyOopsClosure voc(this);
2749 oops_do(&voc);
2750 assert(voc.ok(), "embedded oops must be OK");
2751 verify_scavenge_root_oops();
2752
2753 verify_scopes();
2754 }
2755
2756
2757 void nmethod::verify_interrupt_point(address call_site) {
2758 // Verify IC only when nmethod installation is finished.
2759 bool is_installed = (method()->code() == this) // nmethod is in state 'in_use' and installed
2760 || !this->is_in_use(); // nmethod is installed, but not in 'in_use' state
2761 if (is_installed) {
2762 Thread *cur = Thread::current();
2763 if (CompiledIC_lock->owner() == cur ||
2764 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) &&
2765 SafepointSynchronize::is_at_safepoint())) {
2766 CompiledIC_at(this, call_site);
2767 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
2768 } else {
2769 MutexLocker ml_verify (CompiledIC_lock);
2770 CompiledIC_at(this, call_site);
2771 }
2772 }
2773
2774 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address());
2775 assert(pd != NULL, "PcDesc must exist");
2776 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(),
2777 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(),
2778 pd->return_oop());
2779 !sd->is_top(); sd = sd->sender()) {
2780 sd->verify();
2781 }
2782 }
2783
2784 void nmethod::verify_scopes() {
2785 if( !method() ) return; // Runtime stubs have no scope
2786 if (method()->is_native()) return; // Ignore stub methods.
2787 // iterate through all interrupt point
2788 // and verify the debug information is valid.
2789 RelocIterator iter((nmethod*)this);
2790 while (iter.next()) {
2791 address stub = NULL;
2792 switch (iter.type()) {
2793 case relocInfo::virtual_call_type:
2794 verify_interrupt_point(iter.addr());
2795 break;
2796 case relocInfo::opt_virtual_call_type:
2797 stub = iter.opt_virtual_call_reloc()->static_stub();
2798 verify_interrupt_point(iter.addr());
2799 break;
2800 case relocInfo::static_call_type:
2801 stub = iter.static_call_reloc()->static_stub();
2802 //verify_interrupt_point(iter.addr());
2803 break;
2804 case relocInfo::runtime_call_type:
2805 address destination = iter.reloc()->value();
2806 // Right now there is no way to find out which entries support
2807 // an interrupt point. It would be nice if we had this
2808 // information in a table.
2809 break;
2810 }
2811 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section");
2812 }
2813 }
2814
2815
2816 // -----------------------------------------------------------------------------
2817 // Non-product code
2818 #ifndef PRODUCT
2819
2820 class DebugScavengeRoot: public OopClosure {
2821 nmethod* _nm;
2822 bool _ok;
2823 public:
2824 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { }
2825 bool ok() { return _ok; }
2826 virtual void do_oop(oop* p) {
2827 if ((*p) == NULL || !(*p)->is_scavengable()) return;
2828 if (_ok) {
2829 _nm->print_nmethod(true);
2830 _ok = false;
2831 }
2832 tty->print_cr("*** scavengable oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2833 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2834 (*p)->print();
2835 }
2836 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2837 };
2838
2839 void nmethod::verify_scavenge_root_oops() {
2840 if (UseG1GC) {
2841 return;
2842 }
2843
2844 if (!on_scavenge_root_list()) {
2845 // Actually look inside, to verify the claim that it's clean.
2846 DebugScavengeRoot debug_scavenge_root(this);
2847 oops_do(&debug_scavenge_root);
2848 if (!debug_scavenge_root.ok())
2849 fatal("found an unadvertised bad scavengable oop in the code cache");
2850 }
2851 assert(scavenge_root_not_marked(), "");
2852 }
2853
2854 #endif // PRODUCT
2855
2856 // Printing operations
2857
2858 void nmethod::print() const {
2859 ResourceMark rm;
2860 ttyLocker ttyl; // keep the following output all in one block
2861
2862 tty->print("Compiled method ");
2863
2864 if (is_compiled_by_c1()) {
2865 tty->print("(c1) ");
2866 } else if (is_compiled_by_c2()) {
2867 tty->print("(c2) ");
2868 } else if (is_compiled_by_shark()) {
2869 tty->print("(shark) ");
2870 } else if (is_compiled_by_jvmci()) {
2871 tty->print("(JVMCI) ");
2872 } else {
2873 tty->print("(nm) ");
2874 }
2875
2876 print_on(tty, NULL);
2877
2878 if (WizardMode) {
2879 tty->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this));
2880 tty->print(" for method " INTPTR_FORMAT , p2i(method()));
2881 tty->print(" { ");
2882 if (is_in_use()) tty->print("in_use ");
2883 if (is_not_entrant()) tty->print("not_entrant ");
2884 if (is_zombie()) tty->print("zombie ");
2885 if (is_unloaded()) tty->print("unloaded ");
2886 if (on_scavenge_root_list()) tty->print("scavenge_root ");
2887 tty->print_cr("}:");
2888 }
2889 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2890 p2i(this),
2891 p2i(this) + size(),
2892 size());
2893 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2894 p2i(relocation_begin()),
2895 p2i(relocation_end()),
2896 relocation_size());
2897 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2898 p2i(consts_begin()),
2899 p2i(consts_end()),
2900 consts_size());
2901 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2902 p2i(insts_begin()),
2903 p2i(insts_end()),
2904 insts_size());
2905 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2906 p2i(stub_begin()),
2907 p2i(stub_end()),
2908 stub_size());
2909 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2910 p2i(oops_begin()),
2911 p2i(oops_end()),
2912 oops_size());
2913 if (metadata_size () > 0) tty->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2914 p2i(metadata_begin()),
2915 p2i(metadata_end()),
2916 metadata_size());
2917 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2918 p2i(scopes_data_begin()),
2919 p2i(scopes_data_end()),
2920 scopes_data_size());
2921 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2922 p2i(scopes_pcs_begin()),
2923 p2i(scopes_pcs_end()),
2924 scopes_pcs_size());
2925 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2926 p2i(dependencies_begin()),
2927 p2i(dependencies_end()),
2928 dependencies_size());
2929 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2930 p2i(handler_table_begin()),
2931 p2i(handler_table_end()),
2932 handler_table_size());
2933 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2934 p2i(nul_chk_table_begin()),
2935 p2i(nul_chk_table_end()),
2936 nul_chk_table_size());
2937 }
2938
2939 void nmethod::print_code() {
2940 HandleMark hm;
2941 ResourceMark m;
2942 Disassembler::decode(this);
2943 }
2944
2945
2946 #ifndef PRODUCT
2947
2948 void nmethod::print_scopes() {
2949 // Find the first pc desc for all scopes in the code and print it.
2950 ResourceMark rm;
2951 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2952 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
2953 continue;
2954
2955 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
2956 while (sd != NULL) {
2957 sd->print_on(tty, p);
2958 sd = sd->sender();
2959 }
2960 }
2961 }
2962
2963 void nmethod::print_dependencies() {
2964 ResourceMark rm;
2965 ttyLocker ttyl; // keep the following output all in one block
2966 tty->print_cr("Dependencies:");
2967 for (Dependencies::DepStream deps(this); deps.next(); ) {
2968 deps.print_dependency();
2969 Klass* ctxk = deps.context_type();
2970 if (ctxk != NULL) {
2971 if (ctxk->is_instance_klass() && InstanceKlass::cast(ctxk)->is_dependent_nmethod(this)) {
2972 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name());
2973 }
2974 }
2975 deps.log_dependency(); // put it into the xml log also
2976 }
2977 }
2978
2979
2980 void nmethod::print_relocations() {
2981 ResourceMark m; // in case methods get printed via the debugger
2982 tty->print_cr("relocations:");
2983 RelocIterator iter(this);
2984 iter.print();
2985 if (UseRelocIndex) {
2986 jint* index_end = (jint*)relocation_end() - 1;
2987 jint index_size = *index_end;
2988 jint* index_start = (jint*)( (address)index_end - index_size );
2989 tty->print_cr(" index @" INTPTR_FORMAT ": index_size=%d", p2i(index_start), index_size);
2990 if (index_size > 0) {
2991 jint* ip;
2992 for (ip = index_start; ip+2 <= index_end; ip += 2)
2993 tty->print_cr(" (%d %d) addr=" INTPTR_FORMAT " @" INTPTR_FORMAT,
2994 ip[0],
2995 ip[1],
2996 p2i(header_end()+ip[0]),
2997 p2i(relocation_begin()-1+ip[1]));
2998 for (; ip < index_end; ip++)
2999 tty->print_cr(" (%d ?)", ip[0]);
3000 tty->print_cr(" @" INTPTR_FORMAT ": index_size=%d", p2i(ip), *ip);
3001 ip++;
3002 tty->print_cr("reloc_end @" INTPTR_FORMAT ":", p2i(ip));
3003 }
3004 }
3005 }
3006
3007
3008 void nmethod::print_pcs() {
3009 ResourceMark m; // in case methods get printed via debugger
3010 tty->print_cr("pc-bytecode offsets:");
3011 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
3012 p->print(this);
3013 }
3014 }
3015
3016 #endif // PRODUCT
3017
3018 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
3019 RelocIterator iter(this, begin, end);
3020 bool have_one = false;
3021 while (iter.next()) {
3022 have_one = true;
3023 switch (iter.type()) {
3024 case relocInfo::none: return "no_reloc";
3025 case relocInfo::oop_type: {
3026 stringStream st;
3027 oop_Relocation* r = iter.oop_reloc();
3028 oop obj = r->oop_value();
3029 st.print("oop(");
3030 if (obj == NULL) st.print("NULL");
3031 else obj->print_value_on(&st);
3032 st.print(")");
3033 return st.as_string();
3034 }
3035 case relocInfo::metadata_type: {
3036 stringStream st;
3037 metadata_Relocation* r = iter.metadata_reloc();
3038 Metadata* obj = r->metadata_value();
3039 st.print("metadata(");
3040 if (obj == NULL) st.print("NULL");
3041 else obj->print_value_on(&st);
3042 st.print(")");
3043 return st.as_string();
3044 }
3045 case relocInfo::runtime_call_type: {
3046 stringStream st;
3047 st.print("runtime_call");
3048 runtime_call_Relocation* r = iter.runtime_call_reloc();
3049 address dest = r->destination();
3050 CodeBlob* cb = CodeCache::find_blob(dest);
3051 if (cb != NULL) {
3052 st.print(" %s", cb->name());
3053 }
3054 return st.as_string();
3055 }
3056 case relocInfo::virtual_call_type: return "virtual_call";
3057 case relocInfo::opt_virtual_call_type: return "optimized virtual_call";
3058 case relocInfo::static_call_type: return "static_call";
3059 case relocInfo::static_stub_type: return "static_stub";
3060 case relocInfo::external_word_type: return "external_word";
3061 case relocInfo::internal_word_type: return "internal_word";
3062 case relocInfo::section_word_type: return "section_word";
3063 case relocInfo::poll_type: return "poll";
3064 case relocInfo::poll_return_type: return "poll_return";
3065 case relocInfo::type_mask: return "type_bit_mask";
3066 }
3067 }
3068 return have_one ? "other" : NULL;
3069 }
3070
3071 // Return a the last scope in (begin..end]
3072 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
3073 PcDesc* p = pc_desc_near(begin+1);
3074 if (p != NULL && p->real_pc(this) <= end) {
3075 return new ScopeDesc(this, p->scope_decode_offset(),
3076 p->obj_decode_offset(), p->should_reexecute(), p->rethrow_exception(),
3077 p->return_oop());
3078 }
3079 return NULL;
3080 }
3081
3082 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const {
3083 if (block_begin == entry_point()) stream->print_cr("[Entry Point]");
3084 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]");
3085 if (JVMCI_ONLY(_exception_offset >= 0 &&) block_begin == exception_begin()) stream->print_cr("[Exception Handler]");
3086 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]");
3087 if (JVMCI_ONLY(_deoptimize_offset >= 0 &&) block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]");
3088
3089 if (has_method_handle_invokes())
3090 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]");
3091
3092 if (block_begin == consts_begin()) stream->print_cr("[Constants]");
3093
3094 if (block_begin == entry_point()) {
3095 methodHandle m = method();
3096 if (m.not_null()) {
3097 stream->print(" # ");
3098 m->print_value_on(stream);
3099 stream->cr();
3100 }
3101 if (m.not_null() && !is_osr_method()) {
3102 ResourceMark rm;
3103 int sizeargs = m->size_of_parameters();
3104 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
3105 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
3106 {
3107 int sig_index = 0;
3108 if (!m->is_static())
3109 sig_bt[sig_index++] = T_OBJECT; // 'this'
3110 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) {
3111 BasicType t = ss.type();
3112 sig_bt[sig_index++] = t;
3113 if (type2size[t] == 2) {
3114 sig_bt[sig_index++] = T_VOID;
3115 } else {
3116 assert(type2size[t] == 1, "size is 1 or 2");
3117 }
3118 }
3119 assert(sig_index == sizeargs, "");
3120 }
3121 const char* spname = "sp"; // make arch-specific?
3122 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false);
3123 int stack_slot_offset = this->frame_size() * wordSize;
3124 int tab1 = 14, tab2 = 24;
3125 int sig_index = 0;
3126 int arg_index = (m->is_static() ? 0 : -1);
3127 bool did_old_sp = false;
3128 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) {
3129 bool at_this = (arg_index == -1);
3130 bool at_old_sp = false;
3131 BasicType t = (at_this ? T_OBJECT : ss.type());
3132 assert(t == sig_bt[sig_index], "sigs in sync");
3133 if (at_this)
3134 stream->print(" # this: ");
3135 else
3136 stream->print(" # parm%d: ", arg_index);
3137 stream->move_to(tab1);
3138 VMReg fst = regs[sig_index].first();
3139 VMReg snd = regs[sig_index].second();
3140 if (fst->is_reg()) {
3141 stream->print("%s", fst->name());
3142 if (snd->is_valid()) {
3143 stream->print(":%s", snd->name());
3144 }
3145 } else if (fst->is_stack()) {
3146 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
3147 if (offset == stack_slot_offset) at_old_sp = true;
3148 stream->print("[%s+0x%x]", spname, offset);
3149 } else {
3150 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
3151 }
3152 stream->print(" ");
3153 stream->move_to(tab2);
3154 stream->print("= ");
3155 if (at_this) {
3156 m->method_holder()->print_value_on(stream);
3157 } else {
3158 bool did_name = false;
3159 if (!at_this && ss.is_object()) {
3160 Symbol* name = ss.as_symbol_or_null();
3161 if (name != NULL) {
3162 name->print_value_on(stream);
3163 did_name = true;
3164 }
3165 }
3166 if (!did_name)
3167 stream->print("%s", type2name(t));
3168 }
3169 if (at_old_sp) {
3170 stream->print(" (%s of caller)", spname);
3171 did_old_sp = true;
3172 }
3173 stream->cr();
3174 sig_index += type2size[t];
3175 arg_index += 1;
3176 if (!at_this) ss.next();
3177 }
3178 if (!did_old_sp) {
3179 stream->print(" # ");
3180 stream->move_to(tab1);
3181 stream->print("[%s+0x%x]", spname, stack_slot_offset);
3182 stream->print(" (%s of caller)", spname);
3183 stream->cr();
3184 }
3185 }
3186 }
3187 }
3188
3189 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) {
3190 // First, find an oopmap in (begin, end].
3191 // We use the odd half-closed interval so that oop maps and scope descs
3192 // which are tied to the byte after a call are printed with the call itself.
3193 address base = code_begin();
3194 ImmutableOopMapSet* oms = oop_maps();
3195 if (oms != NULL) {
3196 for (int i = 0, imax = oms->count(); i < imax; i++) {
3197 const ImmutableOopMapPair* pair = oms->pair_at(i);
3198 const ImmutableOopMap* om = pair->get_from(oms);
3199 address pc = base + pair->pc_offset();
3200 if (pc > begin) {
3201 if (pc <= end) {
3202 st->move_to(column);
3203 st->print("; ");
3204 om->print_on(st);
3205 }
3206 break;
3207 }
3208 }
3209 }
3210
3211 // Print any debug info present at this pc.
3212 ScopeDesc* sd = scope_desc_in(begin, end);
3213 if (sd != NULL) {
3214 st->move_to(column);
3215 if (sd->bci() == SynchronizationEntryBCI) {
3216 st->print(";*synchronization entry");
3217 } else {
3218 if (sd->method() == NULL) {
3219 st->print("method is NULL");
3220 } else if (sd->method()->is_native()) {
3221 st->print("method is native");
3222 } else {
3223 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci());
3224 st->print(";*%s", Bytecodes::name(bc));
3225 switch (bc) {
3226 case Bytecodes::_invokevirtual:
3227 case Bytecodes::_invokespecial:
3228 case Bytecodes::_invokestatic:
3229 case Bytecodes::_invokeinterface:
3230 {
3231 Bytecode_invoke invoke(sd->method(), sd->bci());
3232 st->print(" ");
3233 if (invoke.name() != NULL)
3234 invoke.name()->print_symbol_on(st);
3235 else
3236 st->print("<UNKNOWN>");
3237 break;
3238 }
3239 case Bytecodes::_getfield:
3240 case Bytecodes::_putfield:
3241 case Bytecodes::_getstatic:
3242 case Bytecodes::_putstatic:
3243 {
3244 Bytecode_field field(sd->method(), sd->bci());
3245 st->print(" ");
3246 if (field.name() != NULL)
3247 field.name()->print_symbol_on(st);
3248 else
3249 st->print("<UNKNOWN>");
3250 }
3251 }
3252 }
3253 st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop());
3254 }
3255
3256 // Print all scopes
3257 for (;sd != NULL; sd = sd->sender()) {
3258 st->move_to(column);
3259 st->print("; -");
3260 if (sd->method() == NULL) {
3261 st->print("method is NULL");
3262 } else {
3263 sd->method()->print_short_name(st);
3264 }
3265 int lineno = sd->method()->line_number_from_bci(sd->bci());
3266 if (lineno != -1) {
3267 st->print("@%d (line %d)", sd->bci(), lineno);
3268 } else {
3269 st->print("@%d", sd->bci());
3270 }
3271 st->cr();
3272 }
3273 }
3274
3275 // Print relocation information
3276 const char* str = reloc_string_for(begin, end);
3277 if (str != NULL) {
3278 if (sd != NULL) st->cr();
3279 st->move_to(column);
3280 st->print("; {%s}", str);
3281 }
3282 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin());
3283 if (cont_offset != 0) {
3284 st->move_to(column);
3285 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset));
3286 }
3287
3288 }
3289
3290 #ifndef PRODUCT
3291
3292 void nmethod::print_value_on(outputStream* st) const {
3293 st->print("nmethod");
3294 print_on(st, NULL);
3295 }
3296
3297 void nmethod::print_calls(outputStream* st) {
3298 RelocIterator iter(this);
3299 while (iter.next()) {
3300 switch (iter.type()) {
3301 case relocInfo::virtual_call_type:
3302 case relocInfo::opt_virtual_call_type: {
3303 VerifyMutexLocker mc(CompiledIC_lock);
3304 CompiledIC_at(&iter)->print();
3305 break;
3306 }
3307 case relocInfo::static_call_type:
3308 st->print_cr("Static call at " INTPTR_FORMAT, p2i(iter.reloc()->addr()));
3309 compiledStaticCall_at(iter.reloc())->print();
3310 break;
3311 }
3312 }
3313 }
3314
3315 void nmethod::print_handler_table() {
3316 ExceptionHandlerTable(this).print();
3317 }
3318
3319 void nmethod::print_nul_chk_table() {
3320 ImplicitExceptionTable(this).print(code_begin());
3321 }
3322
3323 void nmethod::print_statistics() {
3324 ttyLocker ttyl;
3325 if (xtty != NULL) xtty->head("statistics type='nmethod'");
3326 native_nmethod_stats.print_native_nmethod_stats();
3327 #ifdef COMPILER1
3328 c1_java_nmethod_stats.print_nmethod_stats("C1");
3329 #endif
3330 #ifdef COMPILER2
3331 c2_java_nmethod_stats.print_nmethod_stats("C2");
3332 #endif
3333 #if INCLUDE_JVMCI
3334 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI");
3335 #endif
3336 #ifdef SHARK
3337 shark_java_nmethod_stats.print_nmethod_stats("Shark");
3338 #endif
3339 unknown_java_nmethod_stats.print_nmethod_stats("Unknown");
3340 DebugInformationRecorder::print_statistics();
3341 #ifndef PRODUCT
3342 pc_nmethod_stats.print_pc_stats();
3343 #endif
3344 Dependencies::print_statistics();
3345 if (xtty != NULL) xtty->tail("statistics");
3346 }
3347
3348 #endif // !PRODUCT
3349
3350 #if INCLUDE_JVMCI
3351 void nmethod::clear_jvmci_installed_code() {
3352 // This must be done carefully to maintain nmethod remembered sets properly
3353 BarrierSet* bs = Universe::heap()->barrier_set();
3354 bs->write_ref_nmethod_pre(&_jvmci_installed_code, this);
3355 _jvmci_installed_code = NULL;
3356 bs->write_ref_nmethod_post(&_jvmci_installed_code, this);
3357 }
3358
3359 void nmethod::maybe_invalidate_installed_code() {
3360 if (_jvmci_installed_code != NULL) {
3361 if (!is_alive()) {
3362 // Break the link between nmethod and InstalledCode such that the nmethod
3363 // can subsequently be flushed safely. The link must be maintained while
3364 // the method could have live activations since invalidateInstalledCode
3365 // might want to invalidate all existing activations.
3366 InstalledCode::set_address(_jvmci_installed_code, 0);
3367 InstalledCode::set_entryPoint(_jvmci_installed_code, 0);
3368 clear_jvmci_installed_code();
3369 } else if (is_not_entrant()) {
3370 InstalledCode::set_entryPoint(_jvmci_installed_code, 0);
3371 }
3372 }
3373 }
3374
3375 char* nmethod::jvmci_installed_code_name(char* buf, size_t buflen) {
3376 if (!this->is_compiled_by_jvmci()) {
3377 return NULL;
3378 }
3379 oop installedCode = this->jvmci_installed_code();
3380 if (installedCode != NULL) {
3381 oop installedCodeName = NULL;
3382 if (installedCode->is_a(InstalledCode::klass())) {
3383 installedCodeName = InstalledCode::name(installedCode);
3384 }
3385 if (installedCodeName != NULL) {
3386 return java_lang_String::as_utf8_string(installedCodeName, buf, (int)buflen);
3387 } else {
3388 jio_snprintf(buf, buflen, "null");
3389 return buf;
3390 }
3391 }
3392 jio_snprintf(buf, buflen, "noInstalledCode");
3393 return buf;
3394 }
3395 #endif