1 /*
2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "code/codeCache.hpp"
27 #include "code/compiledIC.hpp"
28 #include "code/dependencies.hpp"
29 #include "code/nativeInst.hpp"
30 #include "code/nmethod.hpp"
31 #include "code/scopeDesc.hpp"
32 #include "compiler/abstractCompiler.hpp"
33 #include "compiler/compileBroker.hpp"
34 #include "compiler/compileLog.hpp"
35 #include "compiler/compilerDirectives.hpp"
36 #include "compiler/disassembler.hpp"
37 #include "interpreter/bytecode.hpp"
38 #include "oops/methodData.hpp"
39 #include "oops/oop.inline.hpp"
40 #include "prims/jvmtiRedefineClassesTrace.hpp"
41 #include "prims/jvmtiImpl.hpp"
42 #include "runtime/atomic.inline.hpp"
43 #include "runtime/orderAccess.inline.hpp"
44 #include "runtime/os.hpp"
45 #include "runtime/sharedRuntime.hpp"
46 #include "runtime/sweeper.hpp"
47 #include "utilities/resourceHash.hpp"
48 #include "utilities/dtrace.hpp"
49 #include "utilities/events.hpp"
50 #include "utilities/xmlstream.hpp"
51 #ifdef TARGET_ARCH_x86
52 # include "nativeInst_x86.hpp"
53 #endif
54 #ifdef TARGET_ARCH_sparc
55 # include "nativeInst_sparc.hpp"
56 #endif
57 #ifdef TARGET_ARCH_zero
58 # include "nativeInst_zero.hpp"
59 #endif
60 #ifdef TARGET_ARCH_arm
61 # include "nativeInst_arm.hpp"
62 #endif
63 #ifdef TARGET_ARCH_ppc
64 # include "nativeInst_ppc.hpp"
65 #endif
66 #ifdef SHARK
67 #include "shark/sharkCompiler.hpp"
68 #endif
69 #if INCLUDE_JVMCI
70 #include "jvmci/jvmciJavaClasses.hpp"
71 #endif
72
73 unsigned char nmethod::_global_unloading_clock = 0;
74
75 #ifdef DTRACE_ENABLED
76
77 // Only bother with this argument setup if dtrace is available
78
79 #define DTRACE_METHOD_UNLOAD_PROBE(method) \
80 { \
81 Method* m = (method); \
82 if (m != NULL) { \
83 Symbol* klass_name = m->klass_name(); \
84 Symbol* name = m->name(); \
85 Symbol* signature = m->signature(); \
86 HOTSPOT_COMPILED_METHOD_UNLOAD( \
87 (char *) klass_name->bytes(), klass_name->utf8_length(), \
88 (char *) name->bytes(), name->utf8_length(), \
89 (char *) signature->bytes(), signature->utf8_length()); \
90 } \
91 }
92
93 #else // ndef DTRACE_ENABLED
94
95 #define DTRACE_METHOD_UNLOAD_PROBE(method)
96
97 #endif
98
99 bool nmethod::is_compiled_by_c1() const {
100 if (compiler() == NULL) {
101 return false;
102 }
103 return compiler()->is_c1();
104 }
105 bool nmethod::is_compiled_by_jvmci() const {
106 if (compiler() == NULL || method() == NULL) return false; // can happen during debug printing
107 if (is_native_method()) return false;
108 return compiler()->is_jvmci();
109 }
110 bool nmethod::is_compiled_by_c2() const {
111 if (compiler() == NULL) {
112 return false;
113 }
114 return compiler()->is_c2();
115 }
116 bool nmethod::is_compiled_by_shark() const {
117 if (compiler() == NULL) {
118 return false;
119 }
120 return compiler()->is_shark();
121 }
122
123
124
125 //---------------------------------------------------------------------------------
126 // NMethod statistics
127 // They are printed under various flags, including:
128 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation.
129 // (In the latter two cases, they like other stats are printed to the log only.)
130
131 #ifndef PRODUCT
132 // These variables are put into one block to reduce relocations
133 // and make it simpler to print from the debugger.
134 struct java_nmethod_stats_struct {
135 int nmethod_count;
136 int total_size;
137 int relocation_size;
138 int consts_size;
139 int insts_size;
140 int stub_size;
141 int scopes_data_size;
142 int scopes_pcs_size;
143 int dependencies_size;
144 int handler_table_size;
145 int nul_chk_table_size;
146 int oops_size;
147 int metadata_size;
148
149 void note_nmethod(nmethod* nm) {
150 nmethod_count += 1;
151 total_size += nm->size();
152 relocation_size += nm->relocation_size();
153 consts_size += nm->consts_size();
154 insts_size += nm->insts_size();
155 stub_size += nm->stub_size();
156 oops_size += nm->oops_size();
157 metadata_size += nm->metadata_size();
158 scopes_data_size += nm->scopes_data_size();
159 scopes_pcs_size += nm->scopes_pcs_size();
160 dependencies_size += nm->dependencies_size();
161 handler_table_size += nm->handler_table_size();
162 nul_chk_table_size += nm->nul_chk_table_size();
163 }
164 void print_nmethod_stats(const char* name) {
165 if (nmethod_count == 0) return;
166 tty->print_cr("Statistics for %d bytecoded nmethods for %s:", nmethod_count, name);
167 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size);
168 if (nmethod_count != 0) tty->print_cr(" header = " SIZE_FORMAT, nmethod_count * sizeof(nmethod));
169 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size);
170 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size);
171 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size);
172 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size);
173 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size);
174 if (metadata_size != 0) tty->print_cr(" metadata = %d", metadata_size);
175 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size);
176 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size);
177 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size);
178 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size);
179 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size);
180 }
181 };
182
183 struct native_nmethod_stats_struct {
184 int native_nmethod_count;
185 int native_total_size;
186 int native_relocation_size;
187 int native_insts_size;
188 int native_oops_size;
189 int native_metadata_size;
190 void note_native_nmethod(nmethod* nm) {
191 native_nmethod_count += 1;
192 native_total_size += nm->size();
193 native_relocation_size += nm->relocation_size();
194 native_insts_size += nm->insts_size();
195 native_oops_size += nm->oops_size();
196 native_metadata_size += nm->metadata_size();
197 }
198 void print_native_nmethod_stats() {
199 if (native_nmethod_count == 0) return;
200 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count);
201 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size);
202 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size);
203 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size);
204 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size);
205 if (native_metadata_size != 0) tty->print_cr(" N. metadata = %d", native_metadata_size);
206 }
207 };
208
209 struct pc_nmethod_stats_struct {
210 int pc_desc_resets; // number of resets (= number of caches)
211 int pc_desc_queries; // queries to nmethod::find_pc_desc
212 int pc_desc_approx; // number of those which have approximate true
213 int pc_desc_repeats; // number of _pc_descs[0] hits
214 int pc_desc_hits; // number of LRU cache hits
215 int pc_desc_tests; // total number of PcDesc examinations
216 int pc_desc_searches; // total number of quasi-binary search steps
217 int pc_desc_adds; // number of LUR cache insertions
218
219 void print_pc_stats() {
220 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query",
221 pc_desc_queries,
222 (double)(pc_desc_tests + pc_desc_searches)
223 / pc_desc_queries);
224 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d",
225 pc_desc_resets,
226 pc_desc_queries, pc_desc_approx,
227 pc_desc_repeats, pc_desc_hits,
228 pc_desc_tests, pc_desc_searches, pc_desc_adds);
229 }
230 };
231
232 #ifdef COMPILER1
233 static java_nmethod_stats_struct c1_java_nmethod_stats;
234 #endif
235 #ifdef COMPILER2
236 static java_nmethod_stats_struct c2_java_nmethod_stats;
237 #endif
238 #if INCLUDE_JVMCI
239 static java_nmethod_stats_struct jvmci_java_nmethod_stats;
240 #endif
241 #ifdef SHARK
242 static java_nmethod_stats_struct shark_java_nmethod_stats;
243 #endif
244 static java_nmethod_stats_struct unknown_java_nmethod_stats;
245
246 static native_nmethod_stats_struct native_nmethod_stats;
247 static pc_nmethod_stats_struct pc_nmethod_stats;
248
249 static void note_java_nmethod(nmethod* nm) {
250 #ifdef COMPILER1
251 if (nm->is_compiled_by_c1()) {
252 c1_java_nmethod_stats.note_nmethod(nm);
253 } else
254 #endif
255 #ifdef COMPILER2
256 if (nm->is_compiled_by_c2()) {
257 c2_java_nmethod_stats.note_nmethod(nm);
258 } else
259 #endif
260 #if INCLUDE_JVMCI
261 if (nm->is_compiled_by_jvmci()) {
262 jvmci_java_nmethod_stats.note_nmethod(nm);
263 } else
264 #endif
265 #ifdef SHARK
266 if (nm->is_compiled_by_shark()) {
267 shark_java_nmethod_stats.note_nmethod(nm);
268 } else
269 #endif
270 {
271 unknown_java_nmethod_stats.note_nmethod(nm);
272 }
273 }
274 #endif // !PRODUCT
275
276 //---------------------------------------------------------------------------------
277
278
279 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) {
280 assert(pc != NULL, "Must be non null");
281 assert(exception.not_null(), "Must be non null");
282 assert(handler != NULL, "Must be non null");
283
284 _count = 0;
285 _exception_type = exception->klass();
286 _next = NULL;
287
288 add_address_and_handler(pc,handler);
289 }
290
291
292 address ExceptionCache::match(Handle exception, address pc) {
293 assert(pc != NULL,"Must be non null");
294 assert(exception.not_null(),"Must be non null");
295 if (exception->klass() == exception_type()) {
296 return (test_address(pc));
297 }
298
299 return NULL;
300 }
301
302
303 bool ExceptionCache::match_exception_with_space(Handle exception) {
304 assert(exception.not_null(),"Must be non null");
305 if (exception->klass() == exception_type() && count() < cache_size) {
306 return true;
307 }
308 return false;
309 }
310
311
312 address ExceptionCache::test_address(address addr) {
313 for (int i=0; i<count(); i++) {
314 if (pc_at(i) == addr) {
315 return handler_at(i);
316 }
317 }
318 return NULL;
319 }
320
321
322 bool ExceptionCache::add_address_and_handler(address addr, address handler) {
323 if (test_address(addr) == handler) return true;
324 if (count() < cache_size) {
325 set_pc_at(count(),addr);
326 set_handler_at(count(), handler);
327 increment_count();
328 return true;
329 }
330 return false;
331 }
332
333
334 // private method for handling exception cache
335 // These methods are private, and used to manipulate the exception cache
336 // directly.
337 ExceptionCache* nmethod::exception_cache_entry_for_exception(Handle exception) {
338 ExceptionCache* ec = exception_cache();
339 while (ec != NULL) {
340 if (ec->match_exception_with_space(exception)) {
341 return ec;
342 }
343 ec = ec->next();
344 }
345 return NULL;
346 }
347
348
349 //-----------------------------------------------------------------------------
350
351
352 // Helper used by both find_pc_desc methods.
353 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) {
354 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_tests);
355 if (!approximate)
356 return pc->pc_offset() == pc_offset;
357 else
358 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset();
359 }
360
361 void PcDescCache::reset_to(PcDesc* initial_pc_desc) {
362 if (initial_pc_desc == NULL) {
363 _pc_descs[0] = NULL; // native method; no PcDescs at all
364 return;
365 }
366 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_resets);
367 // reset the cache by filling it with benign (non-null) values
368 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel");
369 for (int i = 0; i < cache_size; i++)
370 _pc_descs[i] = initial_pc_desc;
371 }
372
373 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) {
374 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_queries);
375 NOT_PRODUCT(if (approximate) ++pc_nmethod_stats.pc_desc_approx);
376
377 // Note: one might think that caching the most recently
378 // read value separately would be a win, but one would be
379 // wrong. When many threads are updating it, the cache
380 // line it's in would bounce between caches, negating
381 // any benefit.
382
383 // In order to prevent race conditions do not load cache elements
384 // repeatedly, but use a local copy:
385 PcDesc* res;
386
387 // Step one: Check the most recently added value.
388 res = _pc_descs[0];
389 if (res == NULL) return NULL; // native method; no PcDescs at all
390 if (match_desc(res, pc_offset, approximate)) {
391 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_repeats);
392 return res;
393 }
394
395 // Step two: Check the rest of the LRU cache.
396 for (int i = 1; i < cache_size; ++i) {
397 res = _pc_descs[i];
398 if (res->pc_offset() < 0) break; // optimization: skip empty cache
399 if (match_desc(res, pc_offset, approximate)) {
400 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_hits);
401 return res;
402 }
403 }
404
405 // Report failure.
406 return NULL;
407 }
408
409 void PcDescCache::add_pc_desc(PcDesc* pc_desc) {
410 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_adds);
411 // Update the LRU cache by shifting pc_desc forward.
412 for (int i = 0; i < cache_size; i++) {
413 PcDesc* next = _pc_descs[i];
414 _pc_descs[i] = pc_desc;
415 pc_desc = next;
416 }
417 }
418
419 // adjust pcs_size so that it is a multiple of both oopSize and
420 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple
421 // of oopSize, then 2*sizeof(PcDesc) is)
422 static int adjust_pcs_size(int pcs_size) {
423 int nsize = round_to(pcs_size, oopSize);
424 if ((nsize % sizeof(PcDesc)) != 0) {
425 nsize = pcs_size + sizeof(PcDesc);
426 }
427 assert((nsize % oopSize) == 0, "correct alignment");
428 return nsize;
429 }
430
431 //-----------------------------------------------------------------------------
432
433
434 void nmethod::add_exception_cache_entry(ExceptionCache* new_entry) {
435 assert(ExceptionCache_lock->owned_by_self(),"Must hold the ExceptionCache_lock");
436 assert(new_entry != NULL,"Must be non null");
437 assert(new_entry->next() == NULL, "Must be null");
438
439 if (exception_cache() != NULL) {
440 new_entry->set_next(exception_cache());
441 }
442 set_exception_cache(new_entry);
443 }
444
445 void nmethod::clean_exception_cache(BoolObjectClosure* is_alive) {
446 ExceptionCache* prev = NULL;
447 ExceptionCache* curr = exception_cache();
448
449 while (curr != NULL) {
450 ExceptionCache* next = curr->next();
451
452 Klass* ex_klass = curr->exception_type();
453 if (ex_klass != NULL && !ex_klass->is_loader_alive(is_alive)) {
454 if (prev == NULL) {
455 set_exception_cache(next);
456 } else {
457 prev->set_next(next);
458 }
459 delete curr;
460 // prev stays the same.
461 } else {
462 prev = curr;
463 }
464
465 curr = next;
466 }
467 }
468
469 // public method for accessing the exception cache
470 // These are the public access methods.
471 address nmethod::handler_for_exception_and_pc(Handle exception, address pc) {
472 // We never grab a lock to read the exception cache, so we may
473 // have false negatives. This is okay, as it can only happen during
474 // the first few exception lookups for a given nmethod.
475 ExceptionCache* ec = exception_cache();
476 while (ec != NULL) {
477 address ret_val;
478 if ((ret_val = ec->match(exception,pc)) != NULL) {
479 return ret_val;
480 }
481 ec = ec->next();
482 }
483 return NULL;
484 }
485
486
487 void nmethod::add_handler_for_exception_and_pc(Handle exception, address pc, address handler) {
488 // There are potential race conditions during exception cache updates, so we
489 // must own the ExceptionCache_lock before doing ANY modifications. Because
490 // we don't lock during reads, it is possible to have several threads attempt
491 // to update the cache with the same data. We need to check for already inserted
492 // copies of the current data before adding it.
493
494 MutexLocker ml(ExceptionCache_lock);
495 ExceptionCache* target_entry = exception_cache_entry_for_exception(exception);
496
497 if (target_entry == NULL || !target_entry->add_address_and_handler(pc,handler)) {
498 target_entry = new ExceptionCache(exception,pc,handler);
499 add_exception_cache_entry(target_entry);
500 }
501 }
502
503
504 //-------------end of code for ExceptionCache--------------
505
506
507 int nmethod::total_size() const {
508 return
509 consts_size() +
510 insts_size() +
511 stub_size() +
512 scopes_data_size() +
513 scopes_pcs_size() +
514 handler_table_size() +
515 nul_chk_table_size();
516 }
517
518 const char* nmethod::compile_kind() const {
519 if (is_osr_method()) return "osr";
520 if (method() != NULL && is_native_method()) return "c2n";
521 return NULL;
522 }
523
524 // Fill in default values for various flag fields
525 void nmethod::init_defaults() {
526 _state = in_use;
527 _unloading_clock = 0;
528 _marked_for_reclamation = 0;
529 _has_flushed_dependencies = 0;
530 _has_unsafe_access = 0;
531 _has_method_handle_invokes = 0;
532 _lazy_critical_native = 0;
533 _has_wide_vectors = 0;
534 _marked_for_deoptimization = 0;
535 _lock_count = 0;
536 _stack_traversal_mark = 0;
537 _unload_reported = false; // jvmti state
538
539 #ifdef ASSERT
540 _oops_are_stale = false;
541 #endif
542
543 _oops_do_mark_link = NULL;
544 _jmethod_id = NULL;
545 _osr_link = NULL;
546 if (UseG1GC) {
547 _unloading_next = NULL;
548 } else {
549 _scavenge_root_link = NULL;
550 }
551 _scavenge_root_state = 0;
552 _compiler = NULL;
553 #if INCLUDE_RTM_OPT
554 _rtm_state = NoRTM;
555 #endif
556 #if INCLUDE_JVMCI
557 _jvmci_installed_code = NULL;
558 _speculation_log = NULL;
559 #endif
560 }
561
562 nmethod* nmethod::new_native_nmethod(const methodHandle& method,
563 int compile_id,
564 CodeBuffer *code_buffer,
565 int vep_offset,
566 int frame_complete,
567 int frame_size,
568 ByteSize basic_lock_owner_sp_offset,
569 ByteSize basic_lock_sp_offset,
570 OopMapSet* oop_maps) {
571 code_buffer->finalize_oop_references(method);
572 // create nmethod
573 nmethod* nm = NULL;
574 {
575 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
576 int native_nmethod_size = allocation_size(code_buffer, sizeof(nmethod));
577 CodeOffsets offsets;
578 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
579 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
580 nm = new (native_nmethod_size, CompLevel_none) nmethod(method(), native_nmethod_size,
581 compile_id, &offsets,
582 code_buffer, frame_size,
583 basic_lock_owner_sp_offset,
584 basic_lock_sp_offset, oop_maps);
585 NOT_PRODUCT(if (nm != NULL) native_nmethod_stats.note_native_nmethod(nm));
586 }
587 // verify nmethod
588 debug_only(if (nm) nm->verify();) // might block
589
590 if (nm != NULL) {
591 nm->log_new_nmethod();
592 }
593
594 return nm;
595 }
596
597 nmethod* nmethod::new_nmethod(const methodHandle& method,
598 int compile_id,
599 int entry_bci,
600 CodeOffsets* offsets,
601 int orig_pc_offset,
602 DebugInformationRecorder* debug_info,
603 Dependencies* dependencies,
604 CodeBuffer* code_buffer, int frame_size,
605 OopMapSet* oop_maps,
606 ExceptionHandlerTable* handler_table,
607 ImplicitExceptionTable* nul_chk_table,
608 AbstractCompiler* compiler,
609 int comp_level
610 #if INCLUDE_JVMCI
611 , Handle installed_code,
612 Handle speculationLog
613 #endif
614 )
615 {
616 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
617 code_buffer->finalize_oop_references(method);
618 // create nmethod
619 nmethod* nm = NULL;
620 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
621 int nmethod_size =
622 allocation_size(code_buffer, sizeof(nmethod))
623 + adjust_pcs_size(debug_info->pcs_size())
624 + round_to(dependencies->size_in_bytes() , oopSize)
625 + round_to(handler_table->size_in_bytes(), oopSize)
626 + round_to(nul_chk_table->size_in_bytes(), oopSize)
627 + round_to(debug_info->data_size() , oopSize);
628
629 nm = new (nmethod_size, comp_level)
630 nmethod(method(), nmethod_size, compile_id, entry_bci, offsets,
631 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size,
632 oop_maps,
633 handler_table,
634 nul_chk_table,
635 compiler,
636 comp_level
637 #if INCLUDE_JVMCI
638 , installed_code,
639 speculationLog
640 #endif
641 );
642
643 if (nm != NULL) {
644 // To make dependency checking during class loading fast, record
645 // the nmethod dependencies in the classes it is dependent on.
646 // This allows the dependency checking code to simply walk the
647 // class hierarchy above the loaded class, checking only nmethods
648 // which are dependent on those classes. The slow way is to
649 // check every nmethod for dependencies which makes it linear in
650 // the number of methods compiled. For applications with a lot
651 // classes the slow way is too slow.
652 for (Dependencies::DepStream deps(nm); deps.next(); ) {
653 if (deps.type() == Dependencies::call_site_target_value) {
654 // CallSite dependencies are managed on per-CallSite instance basis.
655 oop call_site = deps.argument_oop(0);
656 MethodHandles::add_dependent_nmethod(call_site, nm);
657 } else {
658 Klass* klass = deps.context_type();
659 if (klass == NULL) {
660 continue; // ignore things like evol_method
661 }
662 // record this nmethod as dependent on this klass
663 InstanceKlass::cast(klass)->add_dependent_nmethod(nm);
664 }
665 }
666 NOT_PRODUCT(if (nm != NULL) note_java_nmethod(nm));
667 }
668 }
669 // Do verification and logging outside CodeCache_lock.
670 if (nm != NULL) {
671 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
672 DEBUG_ONLY(nm->verify();)
673 nm->log_new_nmethod();
674 }
675 return nm;
676 }
677
678 // For native wrappers
679 nmethod::nmethod(
680 Method* method,
681 int nmethod_size,
682 int compile_id,
683 CodeOffsets* offsets,
684 CodeBuffer* code_buffer,
685 int frame_size,
686 ByteSize basic_lock_owner_sp_offset,
687 ByteSize basic_lock_sp_offset,
688 OopMapSet* oop_maps )
689 : CodeBlob("native nmethod", code_buffer, sizeof(nmethod),
690 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps),
691 _native_receiver_sp_offset(basic_lock_owner_sp_offset),
692 _native_basic_lock_sp_offset(basic_lock_sp_offset)
693 {
694 {
695 debug_only(NoSafepointVerifier nsv;)
696 assert_locked_or_safepoint(CodeCache_lock);
697
698 init_defaults();
699 _method = method;
700 _entry_bci = InvocationEntryBci;
701 // We have no exception handler or deopt handler make the
702 // values something that will never match a pc like the nmethod vtable entry
703 _exception_offset = 0;
704 _deoptimize_offset = 0;
705 _deoptimize_mh_offset = 0;
706 _orig_pc_offset = 0;
707
708 _consts_offset = data_offset();
709 _stub_offset = data_offset();
710 _oops_offset = data_offset();
711 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize);
712 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize);
713 _scopes_pcs_offset = _scopes_data_offset;
714 _dependencies_offset = _scopes_pcs_offset;
715 _handler_table_offset = _dependencies_offset;
716 _nul_chk_table_offset = _handler_table_offset;
717 _nmethod_end_offset = _nul_chk_table_offset;
718 _compile_id = compile_id;
719 _comp_level = CompLevel_none;
720 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
721 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
722 _osr_entry_point = NULL;
723 _exception_cache = NULL;
724 _pc_desc_cache.reset_to(NULL);
725 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
726
727 code_buffer->copy_values_to(this);
728 if (ScavengeRootsInCode) {
729 if (detect_scavenge_root_oops()) {
730 CodeCache::add_scavenge_root_nmethod(this);
731 }
732 Universe::heap()->register_nmethod(this);
733 }
734 debug_only(verify_scavenge_root_oops());
735 CodeCache::commit(this);
736 }
737
738 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
739 ttyLocker ttyl; // keep the following output all in one block
740 // This output goes directly to the tty, not the compiler log.
741 // To enable tools to match it up with the compilation activity,
742 // be sure to tag this tty output with the compile ID.
743 if (xtty != NULL) {
744 xtty->begin_head("print_native_nmethod");
745 xtty->method(_method);
746 xtty->stamp();
747 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
748 }
749 // print the header part first
750 print();
751 // then print the requested information
752 if (PrintNativeNMethods) {
753 print_code();
754 if (oop_maps != NULL) {
755 oop_maps->print();
756 }
757 }
758 if (PrintRelocations) {
759 print_relocations();
760 }
761 if (xtty != NULL) {
762 xtty->tail("print_native_nmethod");
763 }
764 }
765 }
766
767 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () {
768 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level));
769 }
770
771 nmethod::nmethod(
772 Method* method,
773 int nmethod_size,
774 int compile_id,
775 int entry_bci,
776 CodeOffsets* offsets,
777 int orig_pc_offset,
778 DebugInformationRecorder* debug_info,
779 Dependencies* dependencies,
780 CodeBuffer *code_buffer,
781 int frame_size,
782 OopMapSet* oop_maps,
783 ExceptionHandlerTable* handler_table,
784 ImplicitExceptionTable* nul_chk_table,
785 AbstractCompiler* compiler,
786 int comp_level
787 #if INCLUDE_JVMCI
788 , Handle installed_code,
789 Handle speculation_log
790 #endif
791 )
792 : CodeBlob("nmethod", code_buffer, sizeof(nmethod),
793 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps),
794 _native_receiver_sp_offset(in_ByteSize(-1)),
795 _native_basic_lock_sp_offset(in_ByteSize(-1))
796 {
797 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
798 {
799 debug_only(NoSafepointVerifier nsv;)
800 assert_locked_or_safepoint(CodeCache_lock);
801
802 init_defaults();
803 _method = method;
804 _entry_bci = entry_bci;
805 _compile_id = compile_id;
806 _comp_level = comp_level;
807 _compiler = compiler;
808 _orig_pc_offset = orig_pc_offset;
809 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
810
811 // Section offsets
812 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts());
813 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs());
814
815 #if INCLUDE_JVMCI
816 _jvmci_installed_code = installed_code();
817 _speculation_log = (instanceOop)speculation_log();
818
819 if (compiler->is_jvmci()) {
820 // JVMCI might not produce any stub sections
821 if (offsets->value(CodeOffsets::Exceptions) != -1) {
822 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions);
823 } else {
824 _exception_offset = -1;
825 }
826 if (offsets->value(CodeOffsets::Deopt) != -1) {
827 _deoptimize_offset = code_offset() + offsets->value(CodeOffsets::Deopt);
828 } else {
829 _deoptimize_offset = -1;
830 }
831 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
832 _deoptimize_mh_offset = code_offset() + offsets->value(CodeOffsets::DeoptMH);
833 } else {
834 _deoptimize_mh_offset = -1;
835 }
836 } else {
837 #endif
838 // Exception handler and deopt handler are in the stub section
839 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set");
840 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set");
841
842 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
843 _deoptimize_offset = _stub_offset + offsets->value(CodeOffsets::Deopt);
844 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
845 _deoptimize_mh_offset = _stub_offset + offsets->value(CodeOffsets::DeoptMH);
846 } else {
847 _deoptimize_mh_offset = -1;
848 #if INCLUDE_JVMCI
849 }
850 #endif
851 }
852 if (offsets->value(CodeOffsets::UnwindHandler) != -1) {
853 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler);
854 } else {
855 _unwind_handler_offset = -1;
856 }
857
858 _oops_offset = data_offset();
859 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize);
860 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize);
861
862 _scopes_pcs_offset = _scopes_data_offset + round_to(debug_info->data_size (), oopSize);
863 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
864 _handler_table_offset = _dependencies_offset + round_to(dependencies->size_in_bytes (), oopSize);
865 _nul_chk_table_offset = _handler_table_offset + round_to(handler_table->size_in_bytes(), oopSize);
866 _nmethod_end_offset = _nul_chk_table_offset + round_to(nul_chk_table->size_in_bytes(), oopSize);
867
868 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
869 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
870 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry);
871 _exception_cache = NULL;
872 _pc_desc_cache.reset_to(scopes_pcs_begin());
873
874 // Copy contents of ScopeDescRecorder to nmethod
875 code_buffer->copy_values_to(this);
876 debug_info->copy_to(this);
877 dependencies->copy_to(this);
878 if (ScavengeRootsInCode) {
879 if (detect_scavenge_root_oops()) {
880 CodeCache::add_scavenge_root_nmethod(this);
881 }
882 Universe::heap()->register_nmethod(this);
883 }
884 debug_only(verify_scavenge_root_oops());
885
886 CodeCache::commit(this);
887
888 // Copy contents of ExceptionHandlerTable to nmethod
889 handler_table->copy_to(this);
890 nul_chk_table->copy_to(this);
891
892 // we use the information of entry points to find out if a method is
893 // static or non static
894 assert(compiler->is_c2() || compiler->is_jvmci() ||
895 _method->is_static() == (entry_point() == _verified_entry_point),
896 " entry points must be same for static methods and vice versa");
897 }
898 }
899
900 // Print a short set of xml attributes to identify this nmethod. The
901 // output should be embedded in some other element.
902 void nmethod::log_identity(xmlStream* log) const {
903 log->print(" compile_id='%d'", compile_id());
904 const char* nm_kind = compile_kind();
905 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind);
906 if (compiler() != NULL) {
907 log->print(" compiler='%s'", compiler()->name());
908 }
909 if (TieredCompilation) {
910 log->print(" level='%d'", comp_level());
911 }
912 }
913
914
915 #define LOG_OFFSET(log, name) \
916 if (p2i(name##_end()) - p2i(name##_begin())) \
917 log->print(" " XSTR(name) "_offset='" INTX_FORMAT "'" , \
918 p2i(name##_begin()) - p2i(this))
919
920
921 void nmethod::log_new_nmethod() const {
922 if (LogCompilation && xtty != NULL) {
923 ttyLocker ttyl;
924 HandleMark hm;
925 xtty->begin_elem("nmethod");
926 log_identity(xtty);
927 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size());
928 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this));
929
930 LOG_OFFSET(xtty, relocation);
931 LOG_OFFSET(xtty, consts);
932 LOG_OFFSET(xtty, insts);
933 LOG_OFFSET(xtty, stub);
934 LOG_OFFSET(xtty, scopes_data);
935 LOG_OFFSET(xtty, scopes_pcs);
936 LOG_OFFSET(xtty, dependencies);
937 LOG_OFFSET(xtty, handler_table);
938 LOG_OFFSET(xtty, nul_chk_table);
939 LOG_OFFSET(xtty, oops);
940 LOG_OFFSET(xtty, metadata);
941
942 xtty->method(method());
943 xtty->stamp();
944 xtty->end_elem();
945 }
946 }
947
948 #undef LOG_OFFSET
949
950
951 // Print out more verbose output usually for a newly created nmethod.
952 void nmethod::print_on(outputStream* st, const char* msg) const {
953 if (st != NULL) {
954 ttyLocker ttyl;
955 if (WizardMode) {
956 CompileTask::print(st, this, msg, /*short_form:*/ true);
957 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this));
958 } else {
959 CompileTask::print(st, this, msg, /*short_form:*/ false);
960 }
961 }
962 }
963
964
965 void nmethod::print_nmethod(bool printmethod) {
966 ttyLocker ttyl; // keep the following output all in one block
967 if (xtty != NULL) {
968 xtty->begin_head("print_nmethod");
969 xtty->stamp();
970 xtty->end_head();
971 }
972 // print the header part first
973 print();
974 // then print the requested information
975 if (printmethod) {
976 print_code();
977 print_pcs();
978 if (oop_maps()) {
979 oop_maps()->print();
980 }
981 }
982 if (printmethod || PrintDebugInfo || CompilerOracle::has_option_string(_method, "PrintDebugInfo")) {
983 print_scopes();
984 }
985 if (printmethod || PrintRelocations || CompilerOracle::has_option_string(_method, "PrintRelocations")) {
986 print_relocations();
987 }
988 if (printmethod || PrintDependencies || CompilerOracle::has_option_string(_method, "PrintDependencies")) {
989 print_dependencies();
990 }
991 if (printmethod || PrintExceptionHandlers) {
992 print_handler_table();
993 print_nul_chk_table();
994 }
995 if (printmethod) {
996 print_recorded_oops();
997 print_recorded_metadata();
998 }
999 if (xtty != NULL) {
1000 xtty->tail("print_nmethod");
1001 }
1002 }
1003
1004
1005 // Promote one word from an assembly-time handle to a live embedded oop.
1006 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
1007 if (handle == NULL ||
1008 // As a special case, IC oops are initialized to 1 or -1.
1009 handle == (jobject) Universe::non_oop_word()) {
1010 (*dest) = (oop) handle;
1011 } else {
1012 (*dest) = JNIHandles::resolve_non_null(handle);
1013 }
1014 }
1015
1016
1017 // Have to have the same name because it's called by a template
1018 void nmethod::copy_values(GrowableArray<jobject>* array) {
1019 int length = array->length();
1020 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
1021 oop* dest = oops_begin();
1022 for (int index = 0 ; index < length; index++) {
1023 initialize_immediate_oop(&dest[index], array->at(index));
1024 }
1025
1026 // Now we can fix up all the oops in the code. We need to do this
1027 // in the code because the assembler uses jobjects as placeholders.
1028 // The code and relocations have already been initialized by the
1029 // CodeBlob constructor, so it is valid even at this early point to
1030 // iterate over relocations and patch the code.
1031 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true);
1032 }
1033
1034 void nmethod::copy_values(GrowableArray<Metadata*>* array) {
1035 int length = array->length();
1036 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough");
1037 Metadata** dest = metadata_begin();
1038 for (int index = 0 ; index < length; index++) {
1039 dest[index] = array->at(index);
1040 }
1041 }
1042
1043 bool nmethod::is_at_poll_return(address pc) {
1044 RelocIterator iter(this, pc, pc+1);
1045 while (iter.next()) {
1046 if (iter.type() == relocInfo::poll_return_type)
1047 return true;
1048 }
1049 return false;
1050 }
1051
1052
1053 bool nmethod::is_at_poll_or_poll_return(address pc) {
1054 RelocIterator iter(this, pc, pc+1);
1055 while (iter.next()) {
1056 relocInfo::relocType t = iter.type();
1057 if (t == relocInfo::poll_return_type || t == relocInfo::poll_type)
1058 return true;
1059 }
1060 return false;
1061 }
1062
1063
1064 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) {
1065 // re-patch all oop-bearing instructions, just in case some oops moved
1066 RelocIterator iter(this, begin, end);
1067 while (iter.next()) {
1068 if (iter.type() == relocInfo::oop_type) {
1069 oop_Relocation* reloc = iter.oop_reloc();
1070 if (initialize_immediates && reloc->oop_is_immediate()) {
1071 oop* dest = reloc->oop_addr();
1072 initialize_immediate_oop(dest, (jobject) *dest);
1073 }
1074 // Refresh the oop-related bits of this instruction.
1075 reloc->fix_oop_relocation();
1076 } else if (iter.type() == relocInfo::metadata_type) {
1077 metadata_Relocation* reloc = iter.metadata_reloc();
1078 reloc->fix_metadata_relocation();
1079 }
1080 }
1081 }
1082
1083
1084 void nmethod::verify_oop_relocations() {
1085 // Ensure sure that the code matches the current oop values
1086 RelocIterator iter(this, NULL, NULL);
1087 while (iter.next()) {
1088 if (iter.type() == relocInfo::oop_type) {
1089 oop_Relocation* reloc = iter.oop_reloc();
1090 if (!reloc->oop_is_immediate()) {
1091 reloc->verify_oop_relocation();
1092 }
1093 }
1094 }
1095 }
1096
1097
1098 ScopeDesc* nmethod::scope_desc_at(address pc) {
1099 PcDesc* pd = pc_desc_at(pc);
1100 guarantee(pd != NULL, "scope must be present");
1101 return new ScopeDesc(this, pd->scope_decode_offset(),
1102 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(),
1103 pd->return_oop());
1104 }
1105
1106
1107 void nmethod::clear_inline_caches() {
1108 assert(SafepointSynchronize::is_at_safepoint(), "cleaning of IC's only allowed at safepoint");
1109 if (is_zombie()) {
1110 return;
1111 }
1112
1113 RelocIterator iter(this);
1114 while (iter.next()) {
1115 iter.reloc()->clear_inline_cache();
1116 }
1117 }
1118
1119 // Clear ICStubs of all compiled ICs
1120 void nmethod::clear_ic_stubs() {
1121 assert_locked_or_safepoint(CompiledIC_lock);
1122 RelocIterator iter(this);
1123 while(iter.next()) {
1124 if (iter.type() == relocInfo::virtual_call_type) {
1125 CompiledIC* ic = CompiledIC_at(&iter);
1126 ic->clear_ic_stub();
1127 }
1128 }
1129 }
1130
1131
1132 void nmethod::cleanup_inline_caches() {
1133 assert_locked_or_safepoint(CompiledIC_lock);
1134
1135 // If the method is not entrant or zombie then a JMP is plastered over the
1136 // first few bytes. If an oop in the old code was there, that oop
1137 // should not get GC'd. Skip the first few bytes of oops on
1138 // not-entrant methods.
1139 address low_boundary = verified_entry_point();
1140 if (!is_in_use()) {
1141 low_boundary += NativeJump::instruction_size;
1142 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1143 // This means that the low_boundary is going to be a little too high.
1144 // This shouldn't matter, since oops of non-entrant methods are never used.
1145 // In fact, why are we bothering to look at oops in a non-entrant method??
1146 }
1147
1148 // Find all calls in an nmethod and clear the ones that point to non-entrant,
1149 // zombie and unloaded nmethods.
1150 ResourceMark rm;
1151 RelocIterator iter(this, low_boundary);
1152 while(iter.next()) {
1153 switch(iter.type()) {
1154 case relocInfo::virtual_call_type:
1155 case relocInfo::opt_virtual_call_type: {
1156 CompiledIC *ic = CompiledIC_at(&iter);
1157 // Ok, to lookup references to zombies here
1158 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
1159 if( cb != NULL && cb->is_nmethod() ) {
1160 nmethod* nm = (nmethod*)cb;
1161 // Clean inline caches pointing to zombie, non-entrant and unloaded methods
1162 if (!nm->is_in_use() || (nm->method()->code() != nm)) ic->set_to_clean(is_alive());
1163 }
1164 break;
1165 }
1166 case relocInfo::static_call_type: {
1167 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
1168 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
1169 if( cb != NULL && cb->is_nmethod() ) {
1170 nmethod* nm = (nmethod*)cb;
1171 // Clean inline caches pointing to zombie, non-entrant and unloaded methods
1172 if (!nm->is_in_use() || (nm->method()->code() != nm)) csc->set_to_clean();
1173 }
1174 break;
1175 }
1176 }
1177 }
1178 }
1179
1180 void nmethod::verify_clean_inline_caches() {
1181 assert_locked_or_safepoint(CompiledIC_lock);
1182
1183 // If the method is not entrant or zombie then a JMP is plastered over the
1184 // first few bytes. If an oop in the old code was there, that oop
1185 // should not get GC'd. Skip the first few bytes of oops on
1186 // not-entrant methods.
1187 address low_boundary = verified_entry_point();
1188 if (!is_in_use()) {
1189 low_boundary += NativeJump::instruction_size;
1190 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1191 // This means that the low_boundary is going to be a little too high.
1192 // This shouldn't matter, since oops of non-entrant methods are never used.
1193 // In fact, why are we bothering to look at oops in a non-entrant method??
1194 }
1195
1196 ResourceMark rm;
1197 RelocIterator iter(this, low_boundary);
1198 while(iter.next()) {
1199 switch(iter.type()) {
1200 case relocInfo::virtual_call_type:
1201 case relocInfo::opt_virtual_call_type: {
1202 CompiledIC *ic = CompiledIC_at(&iter);
1203 // Ok, to lookup references to zombies here
1204 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
1205 if( cb != NULL && cb->is_nmethod() ) {
1206 nmethod* nm = (nmethod*)cb;
1207 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
1208 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1209 assert(ic->is_clean(), "IC should be clean");
1210 }
1211 }
1212 break;
1213 }
1214 case relocInfo::static_call_type: {
1215 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
1216 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
1217 if( cb != NULL && cb->is_nmethod() ) {
1218 nmethod* nm = (nmethod*)cb;
1219 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
1220 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1221 assert(csc->is_clean(), "IC should be clean");
1222 }
1223 }
1224 break;
1225 }
1226 }
1227 }
1228 }
1229
1230 int nmethod::verify_icholder_relocations() {
1231 int count = 0;
1232
1233 RelocIterator iter(this);
1234 while(iter.next()) {
1235 if (iter.type() == relocInfo::virtual_call_type) {
1236 if (CompiledIC::is_icholder_call_site(iter.virtual_call_reloc())) {
1237 CompiledIC *ic = CompiledIC_at(&iter);
1238 if (TraceCompiledIC) {
1239 tty->print("noticed icholder " INTPTR_FORMAT " ", p2i(ic->cached_icholder()));
1240 ic->print();
1241 }
1242 assert(ic->cached_icholder() != NULL, "must be non-NULL");
1243 count++;
1244 }
1245 }
1246 }
1247
1248 return count;
1249 }
1250
1251 // This is a private interface with the sweeper.
1252 void nmethod::mark_as_seen_on_stack() {
1253 assert(is_alive(), "Must be an alive method");
1254 // Set the traversal mark to ensure that the sweeper does 2
1255 // cleaning passes before moving to zombie.
1256 set_stack_traversal_mark(NMethodSweeper::traversal_count());
1257 }
1258
1259 // Tell if a non-entrant method can be converted to a zombie (i.e.,
1260 // there are no activations on the stack, not in use by the VM,
1261 // and not in use by the ServiceThread)
1262 bool nmethod::can_convert_to_zombie() {
1263 assert(is_not_entrant(), "must be a non-entrant method");
1264
1265 // Since the nmethod sweeper only does partial sweep the sweeper's traversal
1266 // count can be greater than the stack traversal count before it hits the
1267 // nmethod for the second time.
1268 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count() &&
1269 !is_locked_by_vm();
1270 }
1271
1272 void nmethod::inc_decompile_count() {
1273 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return;
1274 // Could be gated by ProfileTraps, but do not bother...
1275 Method* m = method();
1276 if (m == NULL) return;
1277 MethodData* mdo = m->method_data();
1278 if (mdo == NULL) return;
1279 // There is a benign race here. See comments in methodData.hpp.
1280 mdo->inc_decompile_count();
1281 }
1282
1283 void nmethod::increase_unloading_clock() {
1284 _global_unloading_clock++;
1285 if (_global_unloading_clock == 0) {
1286 // _nmethods are allocated with _unloading_clock == 0,
1287 // so 0 is never used as a clock value.
1288 _global_unloading_clock = 1;
1289 }
1290 }
1291
1292 void nmethod::set_unloading_clock(unsigned char unloading_clock) {
1293 OrderAccess::release_store((volatile jubyte*)&_unloading_clock, unloading_clock);
1294 }
1295
1296 unsigned char nmethod::unloading_clock() {
1297 return (unsigned char)OrderAccess::load_acquire((volatile jubyte*)&_unloading_clock);
1298 }
1299
1300 void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) {
1301
1302 post_compiled_method_unload();
1303
1304 // Since this nmethod is being unloaded, make sure that dependencies
1305 // recorded in instanceKlasses get flushed and pass non-NULL closure to
1306 // indicate that this work is being done during a GC.
1307 assert(Universe::heap()->is_gc_active(), "should only be called during gc");
1308 assert(is_alive != NULL, "Should be non-NULL");
1309 // A non-NULL is_alive closure indicates that this is being called during GC.
1310 flush_dependencies(is_alive);
1311
1312 // Break cycle between nmethod & method
1313 if (TraceClassUnloading && WizardMode) {
1314 tty->print_cr("[Class unloading: Making nmethod " INTPTR_FORMAT
1315 " unloadable], Method*(" INTPTR_FORMAT
1316 "), cause(" INTPTR_FORMAT ")",
1317 p2i(this), p2i(_method), p2i(cause));
1318 if (!Universe::heap()->is_gc_active())
1319 cause->klass()->print();
1320 }
1321 // Unlink the osr method, so we do not look this up again
1322 if (is_osr_method()) {
1323 invalidate_osr_method();
1324 }
1325 // If _method is already NULL the Method* is about to be unloaded,
1326 // so we don't have to break the cycle. Note that it is possible to
1327 // have the Method* live here, in case we unload the nmethod because
1328 // it is pointing to some oop (other than the Method*) being unloaded.
1329 if (_method != NULL) {
1330 // OSR methods point to the Method*, but the Method* does not
1331 // point back!
1332 if (_method->code() == this) {
1333 _method->clear_code(); // Break a cycle
1334 }
1335 _method = NULL; // Clear the method of this dead nmethod
1336 }
1337
1338 // Make the class unloaded - i.e., change state and notify sweeper
1339 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
1340 if (is_in_use()) {
1341 // Transitioning directly from live to unloaded -- so
1342 // we need to force a cache clean-up; remember this
1343 // for later on.
1344 CodeCache::set_needs_cache_clean(true);
1345 }
1346
1347 // Unregister must be done before the state change
1348 Universe::heap()->unregister_nmethod(this);
1349
1350 _state = unloaded;
1351
1352 // Log the unloading.
1353 log_state_change();
1354
1355 #if INCLUDE_JVMCI
1356 // The method can only be unloaded after the pointer to the installed code
1357 // Java wrapper is no longer alive. Here we need to clear out this weak
1358 // reference to the dead object. Nulling out the reference has to happen
1359 // after the method is unregistered since the original value may be still
1360 // tracked by the rset.
1361 maybe_invalidate_installed_code();
1362 // Clear these out after the nmethod has been unregistered and any
1363 // updates to the InstalledCode instance have been performed.
1364 _jvmci_installed_code = NULL;
1365 _speculation_log = NULL;
1366 #endif
1367
1368 // The Method* is gone at this point
1369 assert(_method == NULL, "Tautology");
1370
1371 set_osr_link(NULL);
1372 //set_scavenge_root_link(NULL); // done by prune_scavenge_root_nmethods
1373 NMethodSweeper::report_state_change(this);
1374 }
1375
1376 void nmethod::invalidate_osr_method() {
1377 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
1378 // Remove from list of active nmethods
1379 if (method() != NULL)
1380 method()->method_holder()->remove_osr_nmethod(this);
1381 }
1382
1383 void nmethod::log_state_change() const {
1384 if (LogCompilation) {
1385 if (xtty != NULL) {
1386 ttyLocker ttyl; // keep the following output all in one block
1387 if (_state == unloaded) {
1388 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'",
1389 os::current_thread_id());
1390 } else {
1391 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s",
1392 os::current_thread_id(),
1393 (_state == zombie ? " zombie='1'" : ""));
1394 }
1395 log_identity(xtty);
1396 xtty->stamp();
1397 xtty->end_elem();
1398 }
1399 }
1400 if (PrintCompilation && _state != unloaded) {
1401 print_on(tty, _state == zombie ? "made zombie" : "made not entrant");
1402 }
1403 }
1404
1405 /**
1406 * Common functionality for both make_not_entrant and make_zombie
1407 */
1408 bool nmethod::make_not_entrant_or_zombie(unsigned int state) {
1409 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant");
1410 assert(!is_zombie(), "should not already be a zombie");
1411
1412 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below.
1413 nmethodLocker nml(this);
1414 methodHandle the_method(method());
1415 NoSafepointVerifier nsv;
1416
1417 // during patching, depending on the nmethod state we must notify the GC that
1418 // code has been unloaded, unregistering it. We cannot do this right while
1419 // holding the Patching_lock because we need to use the CodeCache_lock. This
1420 // would be prone to deadlocks.
1421 // This flag is used to remember whether we need to later lock and unregister.
1422 bool nmethod_needs_unregister = false;
1423
1424 {
1425 // invalidate osr nmethod before acquiring the patching lock since
1426 // they both acquire leaf locks and we don't want a deadlock.
1427 // This logic is equivalent to the logic below for patching the
1428 // verified entry point of regular methods.
1429 if (is_osr_method()) {
1430 // this effectively makes the osr nmethod not entrant
1431 invalidate_osr_method();
1432 }
1433
1434 // Enter critical section. Does not block for safepoint.
1435 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1436
1437 if (_state == state) {
1438 // another thread already performed this transition so nothing
1439 // to do, but return false to indicate this.
1440 return false;
1441 }
1442
1443 // The caller can be calling the method statically or through an inline
1444 // cache call.
1445 if (!is_osr_method() && !is_not_entrant()) {
1446 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
1447 SharedRuntime::get_handle_wrong_method_stub());
1448 }
1449
1450 if (is_in_use()) {
1451 // It's a true state change, so mark the method as decompiled.
1452 // Do it only for transition from alive.
1453 inc_decompile_count();
1454 }
1455
1456 // If the state is becoming a zombie, signal to unregister the nmethod with
1457 // the heap.
1458 // This nmethod may have already been unloaded during a full GC.
1459 if ((state == zombie) && !is_unloaded()) {
1460 nmethod_needs_unregister = true;
1461 }
1462
1463 // Must happen before state change. Otherwise we have a race condition in
1464 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately
1465 // transition its state from 'not_entrant' to 'zombie' without having to wait
1466 // for stack scanning.
1467 if (state == not_entrant) {
1468 mark_as_seen_on_stack();
1469 OrderAccess::storestore();
1470 }
1471
1472 // Change state
1473 _state = state;
1474
1475 // Log the transition once
1476 log_state_change();
1477
1478 // Invalidate while holding the patching lock
1479 JVMCI_ONLY(maybe_invalidate_installed_code());
1480
1481 // Remove nmethod from method.
1482 // We need to check if both the _code and _from_compiled_code_entry_point
1483 // refer to this nmethod because there is a race in setting these two fields
1484 // in Method* as seen in bugid 4947125.
1485 // If the vep() points to the zombie nmethod, the memory for the nmethod
1486 // could be flushed and the compiler and vtable stubs could still call
1487 // through it.
1488 if (method() != NULL && (method()->code() == this ||
1489 method()->from_compiled_entry() == verified_entry_point())) {
1490 HandleMark hm;
1491 method()->clear_code();
1492 }
1493 } // leave critical region under Patching_lock
1494
1495 // When the nmethod becomes zombie it is no longer alive so the
1496 // dependencies must be flushed. nmethods in the not_entrant
1497 // state will be flushed later when the transition to zombie
1498 // happens or they get unloaded.
1499 if (state == zombie) {
1500 {
1501 // Flushing dependecies must be done before any possible
1502 // safepoint can sneak in, otherwise the oops used by the
1503 // dependency logic could have become stale.
1504 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1505 if (nmethod_needs_unregister) {
1506 Universe::heap()->unregister_nmethod(this);
1507 #ifdef JVMCI
1508 _jvmci_installed_code = NULL;
1509 _speculation_log = NULL;
1510 #endif
1511 }
1512 flush_dependencies(NULL);
1513 }
1514
1515 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload
1516 // event and it hasn't already been reported for this nmethod then
1517 // report it now. The event may have been reported earilier if the GC
1518 // marked it for unloading). JvmtiDeferredEventQueue support means
1519 // we no longer go to a safepoint here.
1520 post_compiled_method_unload();
1521
1522 #ifdef ASSERT
1523 // It's no longer safe to access the oops section since zombie
1524 // nmethods aren't scanned for GC.
1525 _oops_are_stale = true;
1526 #endif
1527 // the Method may be reclaimed by class unloading now that the
1528 // nmethod is in zombie state
1529 set_method(NULL);
1530 } else {
1531 assert(state == not_entrant, "other cases may need to be handled differently");
1532 }
1533
1534 if (TraceCreateZombies) {
1535 ResourceMark m;
1536 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");
1537 }
1538
1539 NMethodSweeper::report_state_change(this);
1540 return true;
1541 }
1542
1543 void nmethod::flush() {
1544 // Note that there are no valid oops in the nmethod anymore.
1545 assert(is_zombie() || (is_osr_method() && is_unloaded()), "must be a zombie method");
1546 assert(is_marked_for_reclamation() || (is_osr_method() && is_unloaded()), "must be marked for reclamation");
1547
1548 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed");
1549 assert_locked_or_safepoint(CodeCache_lock);
1550
1551 // completely deallocate this method
1552 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, p2i(this));
1553 if (PrintMethodFlushing) {
1554 tty->print_cr("*flushing nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT
1555 "/Free CodeCache:" SIZE_FORMAT "Kb",
1556 _compile_id, p2i(this), CodeCache::blob_count(),
1557 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024);
1558 }
1559
1560 // We need to deallocate any ExceptionCache data.
1561 // Note that we do not need to grab the nmethod lock for this, it
1562 // better be thread safe if we're disposing of it!
1563 ExceptionCache* ec = exception_cache();
1564 set_exception_cache(NULL);
1565 while(ec != NULL) {
1566 ExceptionCache* next = ec->next();
1567 delete ec;
1568 ec = next;
1569 }
1570
1571 if (on_scavenge_root_list()) {
1572 CodeCache::drop_scavenge_root_nmethod(this);
1573 }
1574
1575 #ifdef SHARK
1576 ((SharkCompiler *) compiler())->free_compiled_method(insts_begin());
1577 #endif // SHARK
1578
1579 ((CodeBlob*)(this))->flush();
1580
1581 CodeCache::free(this);
1582 }
1583
1584 //
1585 // Notify all classes this nmethod is dependent on that it is no
1586 // longer dependent. This should only be called in two situations.
1587 // First, when a nmethod transitions to a zombie all dependents need
1588 // to be clear. Since zombification happens at a safepoint there's no
1589 // synchronization issues. The second place is a little more tricky.
1590 // During phase 1 of mark sweep class unloading may happen and as a
1591 // result some nmethods may get unloaded. In this case the flushing
1592 // of dependencies must happen during phase 1 since after GC any
1593 // dependencies in the unloaded nmethod won't be updated, so
1594 // traversing the dependency information in unsafe. In that case this
1595 // function is called with a non-NULL argument and this function only
1596 // notifies instanceKlasses that are reachable
1597
1598 void nmethod::flush_dependencies(BoolObjectClosure* is_alive) {
1599 assert_locked_or_safepoint(CodeCache_lock);
1600 assert(Universe::heap()->is_gc_active() == (is_alive != NULL),
1601 "is_alive is non-NULL if and only if we are called during GC");
1602 if (!has_flushed_dependencies()) {
1603 set_has_flushed_dependencies();
1604 for (Dependencies::DepStream deps(this); deps.next(); ) {
1605 if (deps.type() == Dependencies::call_site_target_value) {
1606 // CallSite dependencies are managed on per-CallSite instance basis.
1607 oop call_site = deps.argument_oop(0);
1608 MethodHandles::remove_dependent_nmethod(call_site, this);
1609 } else {
1610 Klass* klass = deps.context_type();
1611 if (klass == NULL) {
1612 continue; // ignore things like evol_method
1613 }
1614 // During GC the is_alive closure is non-NULL, and is used to
1615 // determine liveness of dependees that need to be updated.
1616 if (is_alive == NULL || klass->is_loader_alive(is_alive)) {
1617 // The GC defers deletion of this entry, since there might be multiple threads
1618 // iterating over the _dependencies graph. Other call paths are single-threaded
1619 // and may delete it immediately.
1620 bool delete_immediately = is_alive == NULL;
1621 InstanceKlass::cast(klass)->remove_dependent_nmethod(this, delete_immediately);
1622 }
1623 }
1624 }
1625 }
1626 }
1627
1628
1629 // If this oop is not live, the nmethod can be unloaded.
1630 bool nmethod::can_unload(BoolObjectClosure* is_alive, oop* root, bool unloading_occurred) {
1631 assert(root != NULL, "just checking");
1632 oop obj = *root;
1633 if (obj == NULL || is_alive->do_object_b(obj)) {
1634 return false;
1635 }
1636
1637 // If ScavengeRootsInCode is true, an nmethod might be unloaded
1638 // simply because one of its constant oops has gone dead.
1639 // No actual classes need to be unloaded in order for this to occur.
1640 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading");
1641 make_unloaded(is_alive, obj);
1642 return true;
1643 }
1644
1645 // ------------------------------------------------------------------
1646 // post_compiled_method_load_event
1647 // new method for install_code() path
1648 // Transfer information from compilation to jvmti
1649 void nmethod::post_compiled_method_load_event() {
1650
1651 Method* moop = method();
1652 HOTSPOT_COMPILED_METHOD_LOAD(
1653 (char *) moop->klass_name()->bytes(),
1654 moop->klass_name()->utf8_length(),
1655 (char *) moop->name()->bytes(),
1656 moop->name()->utf8_length(),
1657 (char *) moop->signature()->bytes(),
1658 moop->signature()->utf8_length(),
1659 insts_begin(), insts_size());
1660
1661 if (JvmtiExport::should_post_compiled_method_load() ||
1662 JvmtiExport::should_post_compiled_method_unload()) {
1663 get_and_cache_jmethod_id();
1664 }
1665
1666 if (JvmtiExport::should_post_compiled_method_load()) {
1667 // Let the Service thread (which is a real Java thread) post the event
1668 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1669 JvmtiDeferredEventQueue::enqueue(
1670 JvmtiDeferredEvent::compiled_method_load_event(this));
1671 }
1672 }
1673
1674 jmethodID nmethod::get_and_cache_jmethod_id() {
1675 if (_jmethod_id == NULL) {
1676 // Cache the jmethod_id since it can no longer be looked up once the
1677 // method itself has been marked for unloading.
1678 _jmethod_id = method()->jmethod_id();
1679 }
1680 return _jmethod_id;
1681 }
1682
1683 void nmethod::post_compiled_method_unload() {
1684 if (unload_reported()) {
1685 // During unloading we transition to unloaded and then to zombie
1686 // and the unloading is reported during the first transition.
1687 return;
1688 }
1689
1690 assert(_method != NULL && !is_unloaded(), "just checking");
1691 DTRACE_METHOD_UNLOAD_PROBE(method());
1692
1693 // If a JVMTI agent has enabled the CompiledMethodUnload event then
1694 // post the event. Sometime later this nmethod will be made a zombie
1695 // by the sweeper but the Method* will not be valid at that point.
1696 // If the _jmethod_id is null then no load event was ever requested
1697 // so don't bother posting the unload. The main reason for this is
1698 // that the jmethodID is a weak reference to the Method* so if
1699 // it's being unloaded there's no way to look it up since the weak
1700 // ref will have been cleared.
1701 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) {
1702 assert(!unload_reported(), "already unloaded");
1703 JvmtiDeferredEvent event =
1704 JvmtiDeferredEvent::compiled_method_unload_event(this,
1705 _jmethod_id, insts_begin());
1706 if (SafepointSynchronize::is_at_safepoint()) {
1707 // Don't want to take the queueing lock. Add it as pending and
1708 // it will get enqueued later.
1709 JvmtiDeferredEventQueue::add_pending_event(event);
1710 } else {
1711 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1712 JvmtiDeferredEventQueue::enqueue(event);
1713 }
1714 }
1715
1716 // The JVMTI CompiledMethodUnload event can be enabled or disabled at
1717 // any time. As the nmethod is being unloaded now we mark it has
1718 // having the unload event reported - this will ensure that we don't
1719 // attempt to report the event in the unlikely scenario where the
1720 // event is enabled at the time the nmethod is made a zombie.
1721 set_unload_reported();
1722 }
1723
1724 void static clean_ic_if_metadata_is_dead(CompiledIC *ic, BoolObjectClosure *is_alive) {
1725 if (ic->is_icholder_call()) {
1726 // The only exception is compiledICHolder oops which may
1727 // yet be marked below. (We check this further below).
1728 CompiledICHolder* cichk_oop = ic->cached_icholder();
1729
1730 if (cichk_oop->holder_method()->method_holder()->is_loader_alive(is_alive) &&
1731 cichk_oop->holder_klass()->is_loader_alive(is_alive)) {
1732 return;
1733 }
1734 } else {
1735 Metadata* ic_oop = ic->cached_metadata();
1736 if (ic_oop != NULL) {
1737 if (ic_oop->is_klass()) {
1738 if (((Klass*)ic_oop)->is_loader_alive(is_alive)) {
1739 return;
1740 }
1741 } else if (ic_oop->is_method()) {
1742 if (((Method*)ic_oop)->method_holder()->is_loader_alive(is_alive)) {
1743 return;
1744 }
1745 } else {
1746 ShouldNotReachHere();
1747 }
1748 }
1749 }
1750
1751 ic->set_to_clean();
1752 }
1753
1754 // This is called at the end of the strong tracing/marking phase of a
1755 // GC to unload an nmethod if it contains otherwise unreachable
1756 // oops.
1757
1758 void nmethod::do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred) {
1759 // Make sure the oop's ready to receive visitors
1760 assert(!is_zombie() && !is_unloaded(),
1761 "should not call follow on zombie or unloaded nmethod");
1762
1763 // If the method is not entrant then a JMP is plastered over the
1764 // first few bytes. If an oop in the old code was there, that oop
1765 // should not get GC'd. Skip the first few bytes of oops on
1766 // not-entrant methods.
1767 address low_boundary = verified_entry_point();
1768 if (is_not_entrant()) {
1769 low_boundary += NativeJump::instruction_size;
1770 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1771 // (See comment above.)
1772 }
1773
1774 // The RedefineClasses() API can cause the class unloading invariant
1775 // to no longer be true. See jvmtiExport.hpp for details.
1776 // Also, leave a debugging breadcrumb in local flag.
1777 if (JvmtiExport::has_redefined_a_class()) {
1778 // This set of the unloading_occurred flag is done before the
1779 // call to post_compiled_method_unload() so that the unloading
1780 // of this nmethod is reported.
1781 unloading_occurred = true;
1782 }
1783
1784 // Exception cache
1785 clean_exception_cache(is_alive);
1786
1787 // If class unloading occurred we first iterate over all inline caches and
1788 // clear ICs where the cached oop is referring to an unloaded klass or method.
1789 // The remaining live cached oops will be traversed in the relocInfo::oop_type
1790 // iteration below.
1791 if (unloading_occurred) {
1792 RelocIterator iter(this, low_boundary);
1793 while(iter.next()) {
1794 if (iter.type() == relocInfo::virtual_call_type) {
1795 CompiledIC *ic = CompiledIC_at(&iter);
1796 clean_ic_if_metadata_is_dead(ic, is_alive);
1797 }
1798 }
1799 }
1800
1801 // Compiled code
1802 {
1803 RelocIterator iter(this, low_boundary);
1804 while (iter.next()) {
1805 if (iter.type() == relocInfo::oop_type) {
1806 oop_Relocation* r = iter.oop_reloc();
1807 // In this loop, we must only traverse those oops directly embedded in
1808 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1809 assert(1 == (r->oop_is_immediate()) +
1810 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1811 "oop must be found in exactly one place");
1812 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1813 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) {
1814 return;
1815 }
1816 }
1817 }
1818 }
1819 }
1820
1821
1822 // Scopes
1823 for (oop* p = oops_begin(); p < oops_end(); p++) {
1824 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1825 if (can_unload(is_alive, p, unloading_occurred)) {
1826 return;
1827 }
1828 }
1829
1830 #if INCLUDE_JVMCI
1831 // Follow JVMCI method
1832 BarrierSet* bs = Universe::heap()->barrier_set();
1833 if (_jvmci_installed_code != NULL) {
1834 if (_jvmci_installed_code->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(_jvmci_installed_code)) {
1835 if (!is_alive->do_object_b(_jvmci_installed_code)) {
1836 clear_jvmci_installed_code();
1837 }
1838 } else {
1839 if (can_unload(is_alive, (oop*)&_jvmci_installed_code, unloading_occurred)) {
1840 return;
1841 }
1842 }
1843 }
1844
1845 if (_speculation_log != NULL) {
1846 if (!is_alive->do_object_b(_speculation_log)) {
1847 bs->write_ref_nmethod_pre(&_speculation_log, this);
1848 _speculation_log = NULL;
1849 bs->write_ref_nmethod_post(&_speculation_log, this);
1850 }
1851 }
1852 #endif
1853
1854
1855 // Ensure that all metadata is still alive
1856 verify_metadata_loaders(low_boundary, is_alive);
1857 }
1858
1859 template <class CompiledICorStaticCall>
1860 static bool clean_if_nmethod_is_unloaded(CompiledICorStaticCall *ic, address addr, BoolObjectClosure *is_alive, nmethod* from) {
1861 // Ok, to lookup references to zombies here
1862 CodeBlob *cb = CodeCache::find_blob_unsafe(addr);
1863 if (cb != NULL && cb->is_nmethod()) {
1864 nmethod* nm = (nmethod*)cb;
1865
1866 if (nm->unloading_clock() != nmethod::global_unloading_clock()) {
1867 // The nmethod has not been processed yet.
1868 return true;
1869 }
1870
1871 // Clean inline caches pointing to both zombie and not_entrant methods
1872 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1873 ic->set_to_clean();
1874 assert(ic->is_clean(), "nmethod " PTR_FORMAT "not clean %s", p2i(from), from->method()->name_and_sig_as_C_string());
1875 }
1876 }
1877
1878 return false;
1879 }
1880
1881 static bool clean_if_nmethod_is_unloaded(CompiledIC *ic, BoolObjectClosure *is_alive, nmethod* from) {
1882 return clean_if_nmethod_is_unloaded(ic, ic->ic_destination(), is_alive, from);
1883 }
1884
1885 static bool clean_if_nmethod_is_unloaded(CompiledStaticCall *csc, BoolObjectClosure *is_alive, nmethod* from) {
1886 return clean_if_nmethod_is_unloaded(csc, csc->destination(), is_alive, from);
1887 }
1888
1889 bool nmethod::unload_if_dead_at(RelocIterator* iter_at_oop, BoolObjectClosure *is_alive, bool unloading_occurred) {
1890 assert(iter_at_oop->type() == relocInfo::oop_type, "Wrong relocation type");
1891
1892 oop_Relocation* r = iter_at_oop->oop_reloc();
1893 // Traverse those oops directly embedded in the code.
1894 // Other oops (oop_index>0) are seen as part of scopes_oops.
1895 assert(1 == (r->oop_is_immediate()) +
1896 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1897 "oop must be found in exactly one place");
1898 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1899 // Unload this nmethod if the oop is dead.
1900 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) {
1901 return true;;
1902 }
1903 }
1904
1905 return false;
1906 }
1907
1908
1909 bool nmethod::do_unloading_parallel(BoolObjectClosure* is_alive, bool unloading_occurred) {
1910 ResourceMark rm;
1911
1912 // Make sure the oop's ready to receive visitors
1913 assert(!is_zombie() && !is_unloaded(),
1914 "should not call follow on zombie or unloaded nmethod");
1915
1916 // If the method is not entrant then a JMP is plastered over the
1917 // first few bytes. If an oop in the old code was there, that oop
1918 // should not get GC'd. Skip the first few bytes of oops on
1919 // not-entrant methods.
1920 address low_boundary = verified_entry_point();
1921 if (is_not_entrant()) {
1922 low_boundary += NativeJump::instruction_size;
1923 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1924 // (See comment above.)
1925 }
1926
1927 // The RedefineClasses() API can cause the class unloading invariant
1928 // to no longer be true. See jvmtiExport.hpp for details.
1929 // Also, leave a debugging breadcrumb in local flag.
1930 if (JvmtiExport::has_redefined_a_class()) {
1931 // This set of the unloading_occurred flag is done before the
1932 // call to post_compiled_method_unload() so that the unloading
1933 // of this nmethod is reported.
1934 unloading_occurred = true;
1935 }
1936
1937 // Exception cache
1938 clean_exception_cache(is_alive);
1939
1940 bool is_unloaded = false;
1941 bool postponed = false;
1942
1943 RelocIterator iter(this, low_boundary);
1944 while(iter.next()) {
1945
1946 switch (iter.type()) {
1947
1948 case relocInfo::virtual_call_type:
1949 if (unloading_occurred) {
1950 // If class unloading occurred we first iterate over all inline caches and
1951 // clear ICs where the cached oop is referring to an unloaded klass or method.
1952 clean_ic_if_metadata_is_dead(CompiledIC_at(&iter), is_alive);
1953 }
1954
1955 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
1956 break;
1957
1958 case relocInfo::opt_virtual_call_type:
1959 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
1960 break;
1961
1962 case relocInfo::static_call_type:
1963 postponed |= clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this);
1964 break;
1965
1966 case relocInfo::oop_type:
1967 if (!is_unloaded) {
1968 is_unloaded = unload_if_dead_at(&iter, is_alive, unloading_occurred);
1969 }
1970 break;
1971
1972 case relocInfo::metadata_type:
1973 break; // nothing to do.
1974 }
1975 }
1976
1977 if (is_unloaded) {
1978 return postponed;
1979 }
1980
1981 // Scopes
1982 for (oop* p = oops_begin(); p < oops_end(); p++) {
1983 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1984 if (can_unload(is_alive, p, unloading_occurred)) {
1985 is_unloaded = true;
1986 break;
1987 }
1988 }
1989
1990 if (is_unloaded) {
1991 return postponed;
1992 }
1993
1994 #if INCLUDE_JVMCI
1995 // Follow JVMCI method
1996 BarrierSet* bs = Universe::heap()->barrier_set();
1997 if (_jvmci_installed_code != NULL) {
1998 if (_jvmci_installed_code->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(_jvmci_installed_code)) {
1999 if (!is_alive->do_object_b(_jvmci_installed_code)) {
2000 clear_jvmci_installed_code();
2001 }
2002 } else {
2003 if (can_unload(is_alive, (oop*)&_jvmci_installed_code, unloading_occurred)) {
2004 is_unloaded = true;
2005 }
2006 }
2007 }
2008
2009 if (_speculation_log != NULL) {
2010 if (!is_alive->do_object_b(_speculation_log)) {
2011 bs->write_ref_nmethod_pre(&_speculation_log, this);
2012 _speculation_log = NULL;
2013 bs->write_ref_nmethod_post(&_speculation_log, this);
2014 }
2015 }
2016 #endif
2017
2018 // Ensure that all metadata is still alive
2019 verify_metadata_loaders(low_boundary, is_alive);
2020
2021 return postponed;
2022 }
2023
2024 void nmethod::do_unloading_parallel_postponed(BoolObjectClosure* is_alive, bool unloading_occurred) {
2025 ResourceMark rm;
2026
2027 // Make sure the oop's ready to receive visitors
2028 assert(!is_zombie(),
2029 "should not call follow on zombie nmethod");
2030
2031 // If the method is not entrant then a JMP is plastered over the
2032 // first few bytes. If an oop in the old code was there, that oop
2033 // should not get GC'd. Skip the first few bytes of oops on
2034 // not-entrant methods.
2035 address low_boundary = verified_entry_point();
2036 if (is_not_entrant()) {
2037 low_boundary += NativeJump::instruction_size;
2038 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
2039 // (See comment above.)
2040 }
2041
2042 RelocIterator iter(this, low_boundary);
2043 while(iter.next()) {
2044
2045 switch (iter.type()) {
2046
2047 case relocInfo::virtual_call_type:
2048 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
2049 break;
2050
2051 case relocInfo::opt_virtual_call_type:
2052 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
2053 break;
2054
2055 case relocInfo::static_call_type:
2056 clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this);
2057 break;
2058 }
2059 }
2060 }
2061
2062 #ifdef ASSERT
2063
2064 class CheckClass : AllStatic {
2065 static BoolObjectClosure* _is_alive;
2066
2067 // Check class_loader is alive for this bit of metadata.
2068 static void check_class(Metadata* md) {
2069 Klass* klass = NULL;
2070 if (md->is_klass()) {
2071 klass = ((Klass*)md);
2072 } else if (md->is_method()) {
2073 klass = ((Method*)md)->method_holder();
2074 } else if (md->is_methodData()) {
2075 klass = ((MethodData*)md)->method()->method_holder();
2076 } else {
2077 md->print();
2078 ShouldNotReachHere();
2079 }
2080 assert(klass->is_loader_alive(_is_alive), "must be alive");
2081 }
2082 public:
2083 static void do_check_class(BoolObjectClosure* is_alive, nmethod* nm) {
2084 assert(SafepointSynchronize::is_at_safepoint(), "this is only ok at safepoint");
2085 _is_alive = is_alive;
2086 nm->metadata_do(check_class);
2087 }
2088 };
2089
2090 // This is called during a safepoint so can use static data
2091 BoolObjectClosure* CheckClass::_is_alive = NULL;
2092 #endif // ASSERT
2093
2094
2095 // Processing of oop references should have been sufficient to keep
2096 // all strong references alive. Any weak references should have been
2097 // cleared as well. Visit all the metadata and ensure that it's
2098 // really alive.
2099 void nmethod::verify_metadata_loaders(address low_boundary, BoolObjectClosure* is_alive) {
2100 #ifdef ASSERT
2101 RelocIterator iter(this, low_boundary);
2102 while (iter.next()) {
2103 // static_stub_Relocations may have dangling references to
2104 // Method*s so trim them out here. Otherwise it looks like
2105 // compiled code is maintaining a link to dead metadata.
2106 address static_call_addr = NULL;
2107 if (iter.type() == relocInfo::opt_virtual_call_type) {
2108 CompiledIC* cic = CompiledIC_at(&iter);
2109 if (!cic->is_call_to_interpreted()) {
2110 static_call_addr = iter.addr();
2111 }
2112 } else if (iter.type() == relocInfo::static_call_type) {
2113 CompiledStaticCall* csc = compiledStaticCall_at(iter.reloc());
2114 if (!csc->is_call_to_interpreted()) {
2115 static_call_addr = iter.addr();
2116 }
2117 }
2118 if (static_call_addr != NULL) {
2119 RelocIterator sciter(this, low_boundary);
2120 while (sciter.next()) {
2121 if (sciter.type() == relocInfo::static_stub_type &&
2122 sciter.static_stub_reloc()->static_call() == static_call_addr) {
2123 sciter.static_stub_reloc()->clear_inline_cache();
2124 }
2125 }
2126 }
2127 }
2128 // Check that the metadata embedded in the nmethod is alive
2129 CheckClass::do_check_class(is_alive, this);
2130 #endif
2131 }
2132
2133
2134 // Iterate over metadata calling this function. Used by RedefineClasses
2135 void nmethod::metadata_do(void f(Metadata*)) {
2136 address low_boundary = verified_entry_point();
2137 if (is_not_entrant()) {
2138 low_boundary += NativeJump::instruction_size;
2139 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
2140 // (See comment above.)
2141 }
2142 {
2143 // Visit all immediate references that are embedded in the instruction stream.
2144 RelocIterator iter(this, low_boundary);
2145 while (iter.next()) {
2146 if (iter.type() == relocInfo::metadata_type ) {
2147 metadata_Relocation* r = iter.metadata_reloc();
2148 // In this metadata, we must only follow those metadatas directly embedded in
2149 // the code. Other metadatas (oop_index>0) are seen as part of
2150 // the metadata section below.
2151 assert(1 == (r->metadata_is_immediate()) +
2152 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
2153 "metadata must be found in exactly one place");
2154 if (r->metadata_is_immediate() && r->metadata_value() != NULL) {
2155 Metadata* md = r->metadata_value();
2156 if (md != _method) f(md);
2157 }
2158 } else if (iter.type() == relocInfo::virtual_call_type) {
2159 // Check compiledIC holders associated with this nmethod
2160 CompiledIC *ic = CompiledIC_at(&iter);
2161 if (ic->is_icholder_call()) {
2162 CompiledICHolder* cichk = ic->cached_icholder();
2163 f(cichk->holder_method());
2164 f(cichk->holder_klass());
2165 } else {
2166 Metadata* ic_oop = ic->cached_metadata();
2167 if (ic_oop != NULL) {
2168 f(ic_oop);
2169 }
2170 }
2171 }
2172 }
2173 }
2174
2175 // Visit the metadata section
2176 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
2177 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops
2178 Metadata* md = *p;
2179 f(md);
2180 }
2181
2182 // Visit metadata not embedded in the other places.
2183 if (_method != NULL) f(_method);
2184 }
2185
2186 void nmethod::oops_do(OopClosure* f, bool allow_zombie) {
2187 // make sure the oops ready to receive visitors
2188 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod");
2189 assert(!is_unloaded(), "should not call follow on unloaded nmethod");
2190
2191 // If the method is not entrant or zombie then a JMP is plastered over the
2192 // first few bytes. If an oop in the old code was there, that oop
2193 // should not get GC'd. Skip the first few bytes of oops on
2194 // not-entrant methods.
2195 address low_boundary = verified_entry_point();
2196 if (is_not_entrant()) {
2197 low_boundary += NativeJump::instruction_size;
2198 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
2199 // (See comment above.)
2200 }
2201
2202 #if INCLUDE_JVMCI
2203 if (_jvmci_installed_code != NULL) {
2204 f->do_oop((oop*) &_jvmci_installed_code);
2205 }
2206 if (_speculation_log != NULL) {
2207 f->do_oop((oop*) &_speculation_log);
2208 }
2209 #endif
2210
2211 RelocIterator iter(this, low_boundary);
2212
2213 while (iter.next()) {
2214 if (iter.type() == relocInfo::oop_type ) {
2215 oop_Relocation* r = iter.oop_reloc();
2216 // In this loop, we must only follow those oops directly embedded in
2217 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
2218 assert(1 == (r->oop_is_immediate()) +
2219 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
2220 "oop must be found in exactly one place");
2221 if (r->oop_is_immediate() && r->oop_value() != NULL) {
2222 f->do_oop(r->oop_addr());
2223 }
2224 }
2225 }
2226
2227 // Scopes
2228 // This includes oop constants not inlined in the code stream.
2229 for (oop* p = oops_begin(); p < oops_end(); p++) {
2230 if (*p == Universe::non_oop_word()) continue; // skip non-oops
2231 f->do_oop(p);
2232 }
2233 }
2234
2235 #define NMETHOD_SENTINEL ((nmethod*)badAddress)
2236
2237 nmethod* volatile nmethod::_oops_do_mark_nmethods;
2238
2239 // An nmethod is "marked" if its _mark_link is set non-null.
2240 // Even if it is the end of the linked list, it will have a non-null link value,
2241 // as long as it is on the list.
2242 // This code must be MP safe, because it is used from parallel GC passes.
2243 bool nmethod::test_set_oops_do_mark() {
2244 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");
2245 nmethod* observed_mark_link = _oops_do_mark_link;
2246 if (observed_mark_link == NULL) {
2247 // Claim this nmethod for this thread to mark.
2248 observed_mark_link = (nmethod*)
2249 Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_link, NULL);
2250 if (observed_mark_link == NULL) {
2251
2252 // Atomically append this nmethod (now claimed) to the head of the list:
2253 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods;
2254 for (;;) {
2255 nmethod* required_mark_nmethods = observed_mark_nmethods;
2256 _oops_do_mark_link = required_mark_nmethods;
2257 observed_mark_nmethods = (nmethod*)
2258 Atomic::cmpxchg_ptr(this, &_oops_do_mark_nmethods, required_mark_nmethods);
2259 if (observed_mark_nmethods == required_mark_nmethods)
2260 break;
2261 }
2262 // Mark was clear when we first saw this guy.
2263 if (TraceScavenge) { print_on(tty, "oops_do, mark"); }
2264 return false;
2265 }
2266 }
2267 // On fall through, another racing thread marked this nmethod before we did.
2268 return true;
2269 }
2270
2271 void nmethod::oops_do_marking_prologue() {
2272 if (TraceScavenge) { tty->print_cr("[oops_do_marking_prologue"); }
2273 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row");
2274 // We use cmpxchg_ptr instead of regular assignment here because the user
2275 // may fork a bunch of threads, and we need them all to see the same state.
2276 void* observed = Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, NULL);
2277 guarantee(observed == NULL, "no races in this sequential code");
2278 }
2279
2280 void nmethod::oops_do_marking_epilogue() {
2281 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row");
2282 nmethod* cur = _oops_do_mark_nmethods;
2283 while (cur != NMETHOD_SENTINEL) {
2284 assert(cur != NULL, "not NULL-terminated");
2285 nmethod* next = cur->_oops_do_mark_link;
2286 cur->_oops_do_mark_link = NULL;
2287 DEBUG_ONLY(cur->verify_oop_relocations());
2288 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark"));
2289 cur = next;
2290 }
2291 void* required = _oops_do_mark_nmethods;
2292 void* observed = Atomic::cmpxchg_ptr(NULL, &_oops_do_mark_nmethods, required);
2293 guarantee(observed == required, "no races in this sequential code");
2294 if (TraceScavenge) { tty->print_cr("oops_do_marking_epilogue]"); }
2295 }
2296
2297 class DetectScavengeRoot: public OopClosure {
2298 bool _detected_scavenge_root;
2299 public:
2300 DetectScavengeRoot() : _detected_scavenge_root(false)
2301 { NOT_PRODUCT(_print_nm = NULL); }
2302 bool detected_scavenge_root() { return _detected_scavenge_root; }
2303 virtual void do_oop(oop* p) {
2304 if ((*p) != NULL && (*p)->is_scavengable()) {
2305 NOT_PRODUCT(maybe_print(p));
2306 _detected_scavenge_root = true;
2307 }
2308 }
2309 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2310
2311 #ifndef PRODUCT
2312 nmethod* _print_nm;
2313 void maybe_print(oop* p) {
2314 if (_print_nm == NULL) return;
2315 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root");
2316 tty->print_cr("" PTR_FORMAT "[offset=%d] detected scavengable oop " PTR_FORMAT " (found at " PTR_FORMAT ")",
2317 p2i(_print_nm), (int)((intptr_t)p - (intptr_t)_print_nm),
2318 p2i(*p), p2i(p));
2319 (*p)->print();
2320 }
2321 #endif //PRODUCT
2322 };
2323
2324 bool nmethod::detect_scavenge_root_oops() {
2325 DetectScavengeRoot detect_scavenge_root;
2326 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this);
2327 oops_do(&detect_scavenge_root);
2328 return detect_scavenge_root.detected_scavenge_root();
2329 }
2330
2331 // Method that knows how to preserve outgoing arguments at call. This method must be
2332 // called with a frame corresponding to a Java invoke
2333 void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) {
2334 #ifndef SHARK
2335 if (method() != NULL && !method()->is_native()) {
2336 address pc = fr.pc();
2337 SimpleScopeDesc ssd(this, pc);
2338 Bytecode_invoke call(ssd.method(), ssd.bci());
2339 bool has_receiver = call.has_receiver();
2340 bool has_appendix = call.has_appendix();
2341 Symbol* signature = call.signature();
2342
2343 // The method attached by JIT-compilers should be used, if present.
2344 // Bytecode can be inaccurate in such case.
2345 Method* callee = attached_method_before_pc(pc);
2346 if (callee != NULL) {
2347 has_receiver = !(callee->access_flags().is_static());
2348 has_appendix = false;
2349 signature = callee->signature();
2350 }
2351
2352 fr.oops_compiled_arguments_do(signature, has_receiver, has_appendix, reg_map, f);
2353 }
2354 #endif // !SHARK
2355 }
2356
2357 inline bool includes(void* p, void* from, void* to) {
2358 return from <= p && p < to;
2359 }
2360
2361
2362 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
2363 assert(count >= 2, "must be sentinel values, at least");
2364
2365 #ifdef ASSERT
2366 // must be sorted and unique; we do a binary search in find_pc_desc()
2367 int prev_offset = pcs[0].pc_offset();
2368 assert(prev_offset == PcDesc::lower_offset_limit,
2369 "must start with a sentinel");
2370 for (int i = 1; i < count; i++) {
2371 int this_offset = pcs[i].pc_offset();
2372 assert(this_offset > prev_offset, "offsets must be sorted");
2373 prev_offset = this_offset;
2374 }
2375 assert(prev_offset == PcDesc::upper_offset_limit,
2376 "must end with a sentinel");
2377 #endif //ASSERT
2378
2379 // Search for MethodHandle invokes and tag the nmethod.
2380 for (int i = 0; i < count; i++) {
2381 if (pcs[i].is_method_handle_invoke()) {
2382 set_has_method_handle_invokes(true);
2383 break;
2384 }
2385 }
2386 assert(has_method_handle_invokes() == (_deoptimize_mh_offset != -1), "must have deopt mh handler");
2387
2388 int size = count * sizeof(PcDesc);
2389 assert(scopes_pcs_size() >= size, "oob");
2390 memcpy(scopes_pcs_begin(), pcs, size);
2391
2392 // Adjust the final sentinel downward.
2393 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
2394 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
2395 last_pc->set_pc_offset(content_size() + 1);
2396 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
2397 // Fill any rounding gaps with copies of the last record.
2398 last_pc[1] = last_pc[0];
2399 }
2400 // The following assert could fail if sizeof(PcDesc) is not
2401 // an integral multiple of oopSize (the rounding term).
2402 // If it fails, change the logic to always allocate a multiple
2403 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
2404 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
2405 }
2406
2407 void nmethod::copy_scopes_data(u_char* buffer, int size) {
2408 assert(scopes_data_size() >= size, "oob");
2409 memcpy(scopes_data_begin(), buffer, size);
2410 }
2411
2412 // When using JVMCI the address might be off by the size of a call instruction.
2413 bool nmethod::is_deopt_entry(address pc) {
2414 return pc == deopt_handler_begin()
2415 #if INCLUDE_JVMCI
2416 || pc == (deopt_handler_begin() + NativeCall::instruction_size)
2417 #endif
2418 ;
2419 }
2420
2421 #ifdef ASSERT
2422 static PcDesc* linear_search(nmethod* nm, int pc_offset, bool approximate) {
2423 PcDesc* lower = nm->scopes_pcs_begin();
2424 PcDesc* upper = nm->scopes_pcs_end();
2425 lower += 1; // exclude initial sentinel
2426 PcDesc* res = NULL;
2427 for (PcDesc* p = lower; p < upper; p++) {
2428 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc
2429 if (match_desc(p, pc_offset, approximate)) {
2430 if (res == NULL)
2431 res = p;
2432 else
2433 res = (PcDesc*) badAddress;
2434 }
2435 }
2436 return res;
2437 }
2438 #endif
2439
2440
2441 // Finds a PcDesc with real-pc equal to "pc"
2442 PcDesc* nmethod::find_pc_desc_internal(address pc, bool approximate) {
2443 address base_address = code_begin();
2444 if ((pc < base_address) ||
2445 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
2446 return NULL; // PC is wildly out of range
2447 }
2448 int pc_offset = (int) (pc - base_address);
2449
2450 // Check the PcDesc cache if it contains the desired PcDesc
2451 // (This as an almost 100% hit rate.)
2452 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
2453 if (res != NULL) {
2454 assert(res == linear_search(this, pc_offset, approximate), "cache ok");
2455 return res;
2456 }
2457
2458 // Fallback algorithm: quasi-linear search for the PcDesc
2459 // Find the last pc_offset less than the given offset.
2460 // The successor must be the required match, if there is a match at all.
2461 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
2462 PcDesc* lower = scopes_pcs_begin();
2463 PcDesc* upper = scopes_pcs_end();
2464 upper -= 1; // exclude final sentinel
2465 if (lower >= upper) return NULL; // native method; no PcDescs at all
2466
2467 #define assert_LU_OK \
2468 /* invariant on lower..upper during the following search: */ \
2469 assert(lower->pc_offset() < pc_offset, "sanity"); \
2470 assert(upper->pc_offset() >= pc_offset, "sanity")
2471 assert_LU_OK;
2472
2473 // Use the last successful return as a split point.
2474 PcDesc* mid = _pc_desc_cache.last_pc_desc();
2475 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
2476 if (mid->pc_offset() < pc_offset) {
2477 lower = mid;
2478 } else {
2479 upper = mid;
2480 }
2481
2482 // Take giant steps at first (4096, then 256, then 16, then 1)
2483 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
2484 const int RADIX = (1 << LOG2_RADIX);
2485 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
2486 while ((mid = lower + step) < upper) {
2487 assert_LU_OK;
2488 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
2489 if (mid->pc_offset() < pc_offset) {
2490 lower = mid;
2491 } else {
2492 upper = mid;
2493 break;
2494 }
2495 }
2496 assert_LU_OK;
2497 }
2498
2499 // Sneak up on the value with a linear search of length ~16.
2500 while (true) {
2501 assert_LU_OK;
2502 mid = lower + 1;
2503 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
2504 if (mid->pc_offset() < pc_offset) {
2505 lower = mid;
2506 } else {
2507 upper = mid;
2508 break;
2509 }
2510 }
2511 #undef assert_LU_OK
2512
2513 if (match_desc(upper, pc_offset, approximate)) {
2514 assert(upper == linear_search(this, pc_offset, approximate), "search ok");
2515 _pc_desc_cache.add_pc_desc(upper);
2516 return upper;
2517 } else {
2518 assert(NULL == linear_search(this, pc_offset, approximate), "search ok");
2519 return NULL;
2520 }
2521 }
2522
2523
2524 void nmethod::check_all_dependencies(DepChange& changes) {
2525 // Checked dependencies are allocated into this ResourceMark
2526 ResourceMark rm;
2527
2528 // Turn off dependency tracing while actually testing dependencies.
2529 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) );
2530
2531 typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash,
2532 &DependencySignature::equals, 11027> DepTable;
2533
2534 DepTable* table = new DepTable();
2535
2536 // Iterate over live nmethods and check dependencies of all nmethods that are not
2537 // marked for deoptimization. A particular dependency is only checked once.
2538 NMethodIterator iter;
2539 while(iter.next()) {
2540 nmethod* nm = iter.method();
2541 // Only notify for live nmethods
2542 if (nm->is_alive() && !nm->is_marked_for_deoptimization()) {
2543 for (Dependencies::DepStream deps(nm); deps.next(); ) {
2544 // Construct abstraction of a dependency.
2545 DependencySignature* current_sig = new DependencySignature(deps);
2546
2547 // Determine if dependency is already checked. table->put(...) returns
2548 // 'true' if the dependency is added (i.e., was not in the hashtable).
2549 if (table->put(*current_sig, 1)) {
2550 if (deps.check_dependency() != NULL) {
2551 // Dependency checking failed. Print out information about the failed
2552 // dependency and finally fail with an assert. We can fail here, since
2553 // dependency checking is never done in a product build.
2554 tty->print_cr("Failed dependency:");
2555 changes.print();
2556 nm->print();
2557 nm->print_dependencies();
2558 assert(false, "Should have been marked for deoptimization");
2559 }
2560 }
2561 }
2562 }
2563 }
2564 }
2565
2566 bool nmethod::check_dependency_on(DepChange& changes) {
2567 // What has happened:
2568 // 1) a new class dependee has been added
2569 // 2) dependee and all its super classes have been marked
2570 bool found_check = false; // set true if we are upset
2571 for (Dependencies::DepStream deps(this); deps.next(); ) {
2572 // Evaluate only relevant dependencies.
2573 if (deps.spot_check_dependency_at(changes) != NULL) {
2574 found_check = true;
2575 NOT_DEBUG(break);
2576 }
2577 }
2578 return found_check;
2579 }
2580
2581 bool nmethod::is_evol_dependent_on(Klass* dependee) {
2582 InstanceKlass *dependee_ik = InstanceKlass::cast(dependee);
2583 Array<Method*>* dependee_methods = dependee_ik->methods();
2584 for (Dependencies::DepStream deps(this); deps.next(); ) {
2585 if (deps.type() == Dependencies::evol_method) {
2586 Method* method = deps.method_argument(0);
2587 for (int j = 0; j < dependee_methods->length(); j++) {
2588 if (dependee_methods->at(j) == method) {
2589 // RC_TRACE macro has an embedded ResourceMark
2590 RC_TRACE(0x01000000,
2591 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)",
2592 _method->method_holder()->external_name(),
2593 _method->name()->as_C_string(),
2594 _method->signature()->as_C_string(), compile_id(),
2595 method->method_holder()->external_name(),
2596 method->name()->as_C_string(),
2597 method->signature()->as_C_string()));
2598 if (TraceDependencies || LogCompilation)
2599 deps.log_dependency(dependee);
2600 return true;
2601 }
2602 }
2603 }
2604 }
2605 return false;
2606 }
2607
2608 // Called from mark_for_deoptimization, when dependee is invalidated.
2609 bool nmethod::is_dependent_on_method(Method* dependee) {
2610 for (Dependencies::DepStream deps(this); deps.next(); ) {
2611 if (deps.type() != Dependencies::evol_method)
2612 continue;
2613 Method* method = deps.method_argument(0);
2614 if (method == dependee) return true;
2615 }
2616 return false;
2617 }
2618
2619
2620 bool nmethod::is_patchable_at(address instr_addr) {
2621 assert(insts_contains(instr_addr), "wrong nmethod used");
2622 if (is_zombie()) {
2623 // a zombie may never be patched
2624 return false;
2625 }
2626 return true;
2627 }
2628
2629
2630 address nmethod::continuation_for_implicit_exception(address pc) {
2631 // Exception happened outside inline-cache check code => we are inside
2632 // an active nmethod => use cpc to determine a return address
2633 int exception_offset = pc - code_begin();
2634 int cont_offset = ImplicitExceptionTable(this).at( exception_offset );
2635 #ifdef ASSERT
2636 if (cont_offset == 0) {
2637 Thread* thread = Thread::current();
2638 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
2639 HandleMark hm(thread);
2640 ResourceMark rm(thread);
2641 CodeBlob* cb = CodeCache::find_blob(pc);
2642 assert(cb != NULL && cb == this, "");
2643 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, p2i(pc));
2644 print();
2645 method()->print_codes();
2646 print_code();
2647 print_pcs();
2648 }
2649 #endif
2650 if (cont_offset == 0) {
2651 // Let the normal error handling report the exception
2652 return NULL;
2653 }
2654 return code_begin() + cont_offset;
2655 }
2656
2657
2658
2659 void nmethod_init() {
2660 // make sure you didn't forget to adjust the filler fields
2661 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
2662 }
2663
2664
2665 //-------------------------------------------------------------------------------------------
2666
2667
2668 // QQQ might we make this work from a frame??
2669 nmethodLocker::nmethodLocker(address pc) {
2670 CodeBlob* cb = CodeCache::find_blob(pc);
2671 guarantee(cb != NULL && cb->is_nmethod(), "bad pc for a nmethod found");
2672 _nm = (nmethod*)cb;
2673 lock_nmethod(_nm);
2674 }
2675
2676 // Only JvmtiDeferredEvent::compiled_method_unload_event()
2677 // should pass zombie_ok == true.
2678 void nmethodLocker::lock_nmethod(nmethod* nm, bool zombie_ok) {
2679 if (nm == NULL) return;
2680 Atomic::inc(&nm->_lock_count);
2681 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method");
2682 }
2683
2684 void nmethodLocker::unlock_nmethod(nmethod* nm) {
2685 if (nm == NULL) return;
2686 Atomic::dec(&nm->_lock_count);
2687 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock");
2688 }
2689
2690 // -----------------------------------------------------------------------------
2691 // nmethod::get_deopt_original_pc
2692 //
2693 // Return the original PC for the given PC if:
2694 // (a) the given PC belongs to a nmethod and
2695 // (b) it is a deopt PC
2696 address nmethod::get_deopt_original_pc(const frame* fr) {
2697 if (fr->cb() == NULL) return NULL;
2698
2699 nmethod* nm = fr->cb()->as_nmethod_or_null();
2700 if (nm != NULL && nm->is_deopt_pc(fr->pc()))
2701 return nm->get_original_pc(fr);
2702
2703 return NULL;
2704 }
2705
2706
2707 // -----------------------------------------------------------------------------
2708 // MethodHandle
2709
2710 bool nmethod::is_method_handle_return(address return_pc) {
2711 if (!has_method_handle_invokes()) return false;
2712 PcDesc* pd = pc_desc_at(return_pc);
2713 if (pd == NULL)
2714 return false;
2715 return pd->is_method_handle_invoke();
2716 }
2717
2718
2719 // -----------------------------------------------------------------------------
2720 // Verification
2721
2722 class VerifyOopsClosure: public OopClosure {
2723 nmethod* _nm;
2724 bool _ok;
2725 public:
2726 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
2727 bool ok() { return _ok; }
2728 virtual void do_oop(oop* p) {
2729 if ((*p) == NULL || (*p)->is_oop()) return;
2730 if (_ok) {
2731 _nm->print_nmethod(true);
2732 _ok = false;
2733 }
2734 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2735 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2736 }
2737 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2738 };
2739
2740 void nmethod::verify() {
2741
2742 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant
2743 // seems odd.
2744
2745 if (is_zombie() || is_not_entrant() || is_unloaded())
2746 return;
2747
2748 // Make sure all the entry points are correctly aligned for patching.
2749 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
2750
2751 // assert(method()->is_oop(), "must be valid");
2752
2753 ResourceMark rm;
2754
2755 if (!CodeCache::contains(this)) {
2756 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this));
2757 }
2758
2759 if(is_native_method() )
2760 return;
2761
2762 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
2763 if (nm != this) {
2764 fatal("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this));
2765 }
2766
2767 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2768 if (! p->verify(this)) {
2769 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this));
2770 }
2771 }
2772
2773 VerifyOopsClosure voc(this);
2774 oops_do(&voc);
2775 assert(voc.ok(), "embedded oops must be OK");
2776 verify_scavenge_root_oops();
2777
2778 verify_scopes();
2779 }
2780
2781
2782 void nmethod::verify_interrupt_point(address call_site) {
2783 // Verify IC only when nmethod installation is finished.
2784 bool is_installed = (method()->code() == this) // nmethod is in state 'in_use' and installed
2785 || !this->is_in_use(); // nmethod is installed, but not in 'in_use' state
2786 if (is_installed) {
2787 Thread *cur = Thread::current();
2788 if (CompiledIC_lock->owner() == cur ||
2789 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) &&
2790 SafepointSynchronize::is_at_safepoint())) {
2791 CompiledIC_at(this, call_site);
2792 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
2793 } else {
2794 MutexLocker ml_verify (CompiledIC_lock);
2795 CompiledIC_at(this, call_site);
2796 }
2797 }
2798
2799 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address());
2800 assert(pd != NULL, "PcDesc must exist");
2801 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(),
2802 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(),
2803 pd->return_oop());
2804 !sd->is_top(); sd = sd->sender()) {
2805 sd->verify();
2806 }
2807 }
2808
2809 void nmethod::verify_scopes() {
2810 if( !method() ) return; // Runtime stubs have no scope
2811 if (method()->is_native()) return; // Ignore stub methods.
2812 // iterate through all interrupt point
2813 // and verify the debug information is valid.
2814 RelocIterator iter((nmethod*)this);
2815 while (iter.next()) {
2816 address stub = NULL;
2817 switch (iter.type()) {
2818 case relocInfo::virtual_call_type:
2819 verify_interrupt_point(iter.addr());
2820 break;
2821 case relocInfo::opt_virtual_call_type:
2822 stub = iter.opt_virtual_call_reloc()->static_stub();
2823 verify_interrupt_point(iter.addr());
2824 break;
2825 case relocInfo::static_call_type:
2826 stub = iter.static_call_reloc()->static_stub();
2827 //verify_interrupt_point(iter.addr());
2828 break;
2829 case relocInfo::runtime_call_type:
2830 address destination = iter.reloc()->value();
2831 // Right now there is no way to find out which entries support
2832 // an interrupt point. It would be nice if we had this
2833 // information in a table.
2834 break;
2835 }
2836 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section");
2837 }
2838 }
2839
2840
2841 // -----------------------------------------------------------------------------
2842 // Non-product code
2843 #ifndef PRODUCT
2844
2845 class DebugScavengeRoot: public OopClosure {
2846 nmethod* _nm;
2847 bool _ok;
2848 public:
2849 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { }
2850 bool ok() { return _ok; }
2851 virtual void do_oop(oop* p) {
2852 if ((*p) == NULL || !(*p)->is_scavengable()) return;
2853 if (_ok) {
2854 _nm->print_nmethod(true);
2855 _ok = false;
2856 }
2857 tty->print_cr("*** scavengable oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2858 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2859 (*p)->print();
2860 }
2861 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2862 };
2863
2864 void nmethod::verify_scavenge_root_oops() {
2865 if (UseG1GC) {
2866 return;
2867 }
2868
2869 if (!on_scavenge_root_list()) {
2870 // Actually look inside, to verify the claim that it's clean.
2871 DebugScavengeRoot debug_scavenge_root(this);
2872 oops_do(&debug_scavenge_root);
2873 if (!debug_scavenge_root.ok())
2874 fatal("found an unadvertised bad scavengable oop in the code cache");
2875 }
2876 assert(scavenge_root_not_marked(), "");
2877 }
2878
2879 #endif // PRODUCT
2880
2881 // Printing operations
2882
2883 void nmethod::print() const {
2884 ResourceMark rm;
2885 ttyLocker ttyl; // keep the following output all in one block
2886
2887 tty->print("Compiled method ");
2888
2889 if (is_compiled_by_c1()) {
2890 tty->print("(c1) ");
2891 } else if (is_compiled_by_c2()) {
2892 tty->print("(c2) ");
2893 } else if (is_compiled_by_shark()) {
2894 tty->print("(shark) ");
2895 } else if (is_compiled_by_jvmci()) {
2896 tty->print("(JVMCI) ");
2897 } else {
2898 tty->print("(nm) ");
2899 }
2900
2901 print_on(tty, NULL);
2902
2903 if (WizardMode) {
2904 tty->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this));
2905 tty->print(" for method " INTPTR_FORMAT , p2i(method()));
2906 tty->print(" { ");
2907 if (is_in_use()) tty->print("in_use ");
2908 if (is_not_entrant()) tty->print("not_entrant ");
2909 if (is_zombie()) tty->print("zombie ");
2910 if (is_unloaded()) tty->print("unloaded ");
2911 if (on_scavenge_root_list()) tty->print("scavenge_root ");
2912 tty->print_cr("}:");
2913 }
2914 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2915 p2i(this),
2916 p2i(this) + size(),
2917 size());
2918 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2919 p2i(relocation_begin()),
2920 p2i(relocation_end()),
2921 relocation_size());
2922 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2923 p2i(consts_begin()),
2924 p2i(consts_end()),
2925 consts_size());
2926 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2927 p2i(insts_begin()),
2928 p2i(insts_end()),
2929 insts_size());
2930 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2931 p2i(stub_begin()),
2932 p2i(stub_end()),
2933 stub_size());
2934 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2935 p2i(oops_begin()),
2936 p2i(oops_end()),
2937 oops_size());
2938 if (metadata_size () > 0) tty->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2939 p2i(metadata_begin()),
2940 p2i(metadata_end()),
2941 metadata_size());
2942 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2943 p2i(scopes_data_begin()),
2944 p2i(scopes_data_end()),
2945 scopes_data_size());
2946 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2947 p2i(scopes_pcs_begin()),
2948 p2i(scopes_pcs_end()),
2949 scopes_pcs_size());
2950 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2951 p2i(dependencies_begin()),
2952 p2i(dependencies_end()),
2953 dependencies_size());
2954 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2955 p2i(handler_table_begin()),
2956 p2i(handler_table_end()),
2957 handler_table_size());
2958 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2959 p2i(nul_chk_table_begin()),
2960 p2i(nul_chk_table_end()),
2961 nul_chk_table_size());
2962 }
2963
2964 void nmethod::print_code() {
2965 HandleMark hm;
2966 ResourceMark m;
2967 Disassembler::decode(this);
2968 }
2969
2970
2971 #ifndef PRODUCT
2972
2973 void nmethod::print_scopes() {
2974 // Find the first pc desc for all scopes in the code and print it.
2975 ResourceMark rm;
2976 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2977 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
2978 continue;
2979
2980 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
2981 while (sd != NULL) {
2982 sd->print_on(tty, p);
2983 sd = sd->sender();
2984 }
2985 }
2986 }
2987
2988 void nmethod::print_dependencies() {
2989 ResourceMark rm;
2990 ttyLocker ttyl; // keep the following output all in one block
2991 tty->print_cr("Dependencies:");
2992 for (Dependencies::DepStream deps(this); deps.next(); ) {
2993 deps.print_dependency();
2994 Klass* ctxk = deps.context_type();
2995 if (ctxk != NULL) {
2996 if (ctxk->is_instance_klass() && InstanceKlass::cast(ctxk)->is_dependent_nmethod(this)) {
2997 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name());
2998 }
2999 }
3000 deps.log_dependency(); // put it into the xml log also
3001 }
3002 }
3003
3004
3005 void nmethod::print_relocations() {
3006 ResourceMark m; // in case methods get printed via the debugger
3007 tty->print_cr("relocations:");
3008 RelocIterator iter(this);
3009 iter.print();
3010 if (UseRelocIndex) {
3011 jint* index_end = (jint*)relocation_end() - 1;
3012 jint index_size = *index_end;
3013 jint* index_start = (jint*)( (address)index_end - index_size );
3014 tty->print_cr(" index @" INTPTR_FORMAT ": index_size=%d", p2i(index_start), index_size);
3015 if (index_size > 0) {
3016 jint* ip;
3017 for (ip = index_start; ip+2 <= index_end; ip += 2)
3018 tty->print_cr(" (%d %d) addr=" INTPTR_FORMAT " @" INTPTR_FORMAT,
3019 ip[0],
3020 ip[1],
3021 p2i(header_end()+ip[0]),
3022 p2i(relocation_begin()-1+ip[1]));
3023 for (; ip < index_end; ip++)
3024 tty->print_cr(" (%d ?)", ip[0]);
3025 tty->print_cr(" @" INTPTR_FORMAT ": index_size=%d", p2i(ip), *ip);
3026 ip++;
3027 tty->print_cr("reloc_end @" INTPTR_FORMAT ":", p2i(ip));
3028 }
3029 }
3030 }
3031
3032
3033 void nmethod::print_pcs() {
3034 ResourceMark m; // in case methods get printed via debugger
3035 tty->print_cr("pc-bytecode offsets:");
3036 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
3037 p->print(this);
3038 }
3039 }
3040
3041 void nmethod::print_recorded_oops() {
3042 tty->print_cr("Recorded oops:");
3043 for (int i = 0; i < oops_count(); i++) {
3044 oop o = oop_at(i);
3045 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(o));
3046 if (o == (oop)Universe::non_oop_word()) {
3047 tty->print("non-oop word");
3048 } else {
3049 o->print_value();
3050 }
3051 tty->cr();
3052 }
3053 }
3054
3055 void nmethod::print_recorded_metadata() {
3056 tty->print_cr("Recorded metadata:");
3057 for (int i = 0; i < metadata_count(); i++) {
3058 Metadata* m = metadata_at(i);
3059 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(m));
3060 if (m == (Metadata*)Universe::non_oop_word()) {
3061 tty->print("non-metadata word");
3062 } else {
3063 m->print_value_on_maybe_null(tty);
3064 }
3065 tty->cr();
3066 }
3067 }
3068
3069 #endif // PRODUCT
3070
3071 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
3072 RelocIterator iter(this, begin, end);
3073 bool have_one = false;
3074 while (iter.next()) {
3075 have_one = true;
3076 switch (iter.type()) {
3077 case relocInfo::none: return "no_reloc";
3078 case relocInfo::oop_type: {
3079 stringStream st;
3080 oop_Relocation* r = iter.oop_reloc();
3081 oop obj = r->oop_value();
3082 st.print("oop(");
3083 if (obj == NULL) st.print("NULL");
3084 else obj->print_value_on(&st);
3085 st.print(")");
3086 return st.as_string();
3087 }
3088 case relocInfo::metadata_type: {
3089 stringStream st;
3090 metadata_Relocation* r = iter.metadata_reloc();
3091 Metadata* obj = r->metadata_value();
3092 st.print("metadata(");
3093 if (obj == NULL) st.print("NULL");
3094 else obj->print_value_on(&st);
3095 st.print(")");
3096 return st.as_string();
3097 }
3098 case relocInfo::runtime_call_type: {
3099 stringStream st;
3100 st.print("runtime_call");
3101 runtime_call_Relocation* r = iter.runtime_call_reloc();
3102 address dest = r->destination();
3103 CodeBlob* cb = CodeCache::find_blob(dest);
3104 if (cb != NULL) {
3105 st.print(" %s", cb->name());
3106 } else {
3107 ResourceMark rm;
3108 const int buflen = 1024;
3109 char* buf = NEW_RESOURCE_ARRAY(char, buflen);
3110 int offset;
3111 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) {
3112 st.print(" %s", buf);
3113 if (offset != 0) {
3114 st.print("+%d", offset);
3115 }
3116 }
3117 }
3118 return st.as_string();
3119 }
3120 case relocInfo::virtual_call_type: {
3121 stringStream st;
3122 st.print_raw("virtual_call");
3123 virtual_call_Relocation* r = iter.virtual_call_reloc();
3124 Method* m = r->method_value();
3125 if (m != NULL) {
3126 assert(m->is_method(), "");
3127 m->print_short_name(&st);
3128 }
3129 return st.as_string();
3130 }
3131 case relocInfo::opt_virtual_call_type: {
3132 stringStream st;
3133 st.print_raw("optimized virtual_call");
3134 opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc();
3135 Method* m = r->method_value();
3136 if (m != NULL) {
3137 assert(m->is_method(), "");
3138 m->print_short_name(&st);
3139 }
3140 return st.as_string();
3141 }
3142 case relocInfo::static_call_type: {
3143 stringStream st;
3144 st.print_raw("static_call");
3145 static_call_Relocation* r = iter.static_call_reloc();
3146 Method* m = r->method_value();
3147 if (m != NULL) {
3148 assert(m->is_method(), "");
3149 m->print_short_name(&st);
3150 }
3151 return st.as_string();
3152 }
3153 case relocInfo::static_stub_type: return "static_stub";
3154 case relocInfo::external_word_type: return "external_word";
3155 case relocInfo::internal_word_type: return "internal_word";
3156 case relocInfo::section_word_type: return "section_word";
3157 case relocInfo::poll_type: return "poll";
3158 case relocInfo::poll_return_type: return "poll_return";
3159 case relocInfo::type_mask: return "type_bit_mask";
3160 }
3161 }
3162 return have_one ? "other" : NULL;
3163 }
3164
3165 // Return a the last scope in (begin..end]
3166 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
3167 PcDesc* p = pc_desc_near(begin+1);
3168 if (p != NULL && p->real_pc(this) <= end) {
3169 return new ScopeDesc(this, p->scope_decode_offset(),
3170 p->obj_decode_offset(), p->should_reexecute(), p->rethrow_exception(),
3171 p->return_oop());
3172 }
3173 return NULL;
3174 }
3175
3176 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const {
3177 if (block_begin == entry_point()) stream->print_cr("[Entry Point]");
3178 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]");
3179 if (JVMCI_ONLY(_exception_offset >= 0 &&) block_begin == exception_begin()) stream->print_cr("[Exception Handler]");
3180 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]");
3181 if (JVMCI_ONLY(_deoptimize_offset >= 0 &&) block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]");
3182
3183 if (has_method_handle_invokes())
3184 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]");
3185
3186 if (block_begin == consts_begin()) stream->print_cr("[Constants]");
3187
3188 if (block_begin == entry_point()) {
3189 methodHandle m = method();
3190 if (m.not_null()) {
3191 stream->print(" # ");
3192 m->print_value_on(stream);
3193 stream->cr();
3194 }
3195 if (m.not_null() && !is_osr_method()) {
3196 ResourceMark rm;
3197 int sizeargs = m->size_of_parameters();
3198 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
3199 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
3200 {
3201 int sig_index = 0;
3202 if (!m->is_static())
3203 sig_bt[sig_index++] = T_OBJECT; // 'this'
3204 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) {
3205 BasicType t = ss.type();
3206 sig_bt[sig_index++] = t;
3207 if (type2size[t] == 2) {
3208 sig_bt[sig_index++] = T_VOID;
3209 } else {
3210 assert(type2size[t] == 1, "size is 1 or 2");
3211 }
3212 }
3213 assert(sig_index == sizeargs, "");
3214 }
3215 const char* spname = "sp"; // make arch-specific?
3216 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false);
3217 int stack_slot_offset = this->frame_size() * wordSize;
3218 int tab1 = 14, tab2 = 24;
3219 int sig_index = 0;
3220 int arg_index = (m->is_static() ? 0 : -1);
3221 bool did_old_sp = false;
3222 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) {
3223 bool at_this = (arg_index == -1);
3224 bool at_old_sp = false;
3225 BasicType t = (at_this ? T_OBJECT : ss.type());
3226 assert(t == sig_bt[sig_index], "sigs in sync");
3227 if (at_this)
3228 stream->print(" # this: ");
3229 else
3230 stream->print(" # parm%d: ", arg_index);
3231 stream->move_to(tab1);
3232 VMReg fst = regs[sig_index].first();
3233 VMReg snd = regs[sig_index].second();
3234 if (fst->is_reg()) {
3235 stream->print("%s", fst->name());
3236 if (snd->is_valid()) {
3237 stream->print(":%s", snd->name());
3238 }
3239 } else if (fst->is_stack()) {
3240 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
3241 if (offset == stack_slot_offset) at_old_sp = true;
3242 stream->print("[%s+0x%x]", spname, offset);
3243 } else {
3244 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
3245 }
3246 stream->print(" ");
3247 stream->move_to(tab2);
3248 stream->print("= ");
3249 if (at_this) {
3250 m->method_holder()->print_value_on(stream);
3251 } else {
3252 bool did_name = false;
3253 if (!at_this && ss.is_object()) {
3254 Symbol* name = ss.as_symbol_or_null();
3255 if (name != NULL) {
3256 name->print_value_on(stream);
3257 did_name = true;
3258 }
3259 }
3260 if (!did_name)
3261 stream->print("%s", type2name(t));
3262 }
3263 if (at_old_sp) {
3264 stream->print(" (%s of caller)", spname);
3265 did_old_sp = true;
3266 }
3267 stream->cr();
3268 sig_index += type2size[t];
3269 arg_index += 1;
3270 if (!at_this) ss.next();
3271 }
3272 if (!did_old_sp) {
3273 stream->print(" # ");
3274 stream->move_to(tab1);
3275 stream->print("[%s+0x%x]", spname, stack_slot_offset);
3276 stream->print(" (%s of caller)", spname);
3277 stream->cr();
3278 }
3279 }
3280 }
3281 }
3282
3283 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) {
3284 // First, find an oopmap in (begin, end].
3285 // We use the odd half-closed interval so that oop maps and scope descs
3286 // which are tied to the byte after a call are printed with the call itself.
3287 address base = code_begin();
3288 ImmutableOopMapSet* oms = oop_maps();
3289 if (oms != NULL) {
3290 for (int i = 0, imax = oms->count(); i < imax; i++) {
3291 const ImmutableOopMapPair* pair = oms->pair_at(i);
3292 const ImmutableOopMap* om = pair->get_from(oms);
3293 address pc = base + pair->pc_offset();
3294 if (pc > begin) {
3295 if (pc <= end) {
3296 st->move_to(column);
3297 st->print("; ");
3298 om->print_on(st);
3299 }
3300 break;
3301 }
3302 }
3303 }
3304
3305 // Print any debug info present at this pc.
3306 ScopeDesc* sd = scope_desc_in(begin, end);
3307 if (sd != NULL) {
3308 st->move_to(column);
3309 if (sd->bci() == SynchronizationEntryBCI) {
3310 st->print(";*synchronization entry");
3311 } else {
3312 if (sd->method() == NULL) {
3313 st->print("method is NULL");
3314 } else if (sd->method()->is_native()) {
3315 st->print("method is native");
3316 } else {
3317 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci());
3318 st->print(";*%s", Bytecodes::name(bc));
3319 switch (bc) {
3320 case Bytecodes::_invokevirtual:
3321 case Bytecodes::_invokespecial:
3322 case Bytecodes::_invokestatic:
3323 case Bytecodes::_invokeinterface:
3324 {
3325 Bytecode_invoke invoke(sd->method(), sd->bci());
3326 st->print(" ");
3327 if (invoke.name() != NULL)
3328 invoke.name()->print_symbol_on(st);
3329 else
3330 st->print("<UNKNOWN>");
3331 break;
3332 }
3333 case Bytecodes::_getfield:
3334 case Bytecodes::_putfield:
3335 case Bytecodes::_getstatic:
3336 case Bytecodes::_putstatic:
3337 {
3338 Bytecode_field field(sd->method(), sd->bci());
3339 st->print(" ");
3340 if (field.name() != NULL)
3341 field.name()->print_symbol_on(st);
3342 else
3343 st->print("<UNKNOWN>");
3344 }
3345 }
3346 }
3347 st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop());
3348 }
3349
3350 // Print all scopes
3351 for (;sd != NULL; sd = sd->sender()) {
3352 st->move_to(column);
3353 st->print("; -");
3354 if (sd->method() == NULL) {
3355 st->print("method is NULL");
3356 } else {
3357 sd->method()->print_short_name(st);
3358 }
3359 int lineno = sd->method()->line_number_from_bci(sd->bci());
3360 if (lineno != -1) {
3361 st->print("@%d (line %d)", sd->bci(), lineno);
3362 } else {
3363 st->print("@%d", sd->bci());
3364 }
3365 st->cr();
3366 }
3367 }
3368
3369 // Print relocation information
3370 const char* str = reloc_string_for(begin, end);
3371 if (str != NULL) {
3372 if (sd != NULL) st->cr();
3373 st->move_to(column);
3374 st->print("; {%s}", str);
3375 }
3376 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin());
3377 if (cont_offset != 0) {
3378 st->move_to(column);
3379 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset));
3380 }
3381
3382 }
3383
3384 #ifndef PRODUCT
3385
3386 void nmethod::print_value_on(outputStream* st) const {
3387 st->print("nmethod");
3388 print_on(st, NULL);
3389 }
3390
3391 void nmethod::print_calls(outputStream* st) {
3392 RelocIterator iter(this);
3393 while (iter.next()) {
3394 switch (iter.type()) {
3395 case relocInfo::virtual_call_type:
3396 case relocInfo::opt_virtual_call_type: {
3397 VerifyMutexLocker mc(CompiledIC_lock);
3398 CompiledIC_at(&iter)->print();
3399 break;
3400 }
3401 case relocInfo::static_call_type:
3402 st->print_cr("Static call at " INTPTR_FORMAT, p2i(iter.reloc()->addr()));
3403 compiledStaticCall_at(iter.reloc())->print();
3404 break;
3405 }
3406 }
3407 }
3408
3409 void nmethod::print_handler_table() {
3410 ExceptionHandlerTable(this).print();
3411 }
3412
3413 void nmethod::print_nul_chk_table() {
3414 ImplicitExceptionTable(this).print(code_begin());
3415 }
3416
3417 void nmethod::print_statistics() {
3418 ttyLocker ttyl;
3419 if (xtty != NULL) xtty->head("statistics type='nmethod'");
3420 native_nmethod_stats.print_native_nmethod_stats();
3421 #ifdef COMPILER1
3422 c1_java_nmethod_stats.print_nmethod_stats("C1");
3423 #endif
3424 #ifdef COMPILER2
3425 c2_java_nmethod_stats.print_nmethod_stats("C2");
3426 #endif
3427 #if INCLUDE_JVMCI
3428 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI");
3429 #endif
3430 #ifdef SHARK
3431 shark_java_nmethod_stats.print_nmethod_stats("Shark");
3432 #endif
3433 unknown_java_nmethod_stats.print_nmethod_stats("Unknown");
3434 DebugInformationRecorder::print_statistics();
3435 #ifndef PRODUCT
3436 pc_nmethod_stats.print_pc_stats();
3437 #endif
3438 Dependencies::print_statistics();
3439 if (xtty != NULL) xtty->tail("statistics");
3440 }
3441
3442 #endif // !PRODUCT
3443
3444 #if INCLUDE_JVMCI
3445 void nmethod::clear_jvmci_installed_code() {
3446 // write_ref_method_pre/post can only be safely called at a
3447 // safepoint or while holding the CodeCache_lock
3448 assert(CodeCache_lock->is_locked() ||
3449 SafepointSynchronize::is_at_safepoint(), "should be performed under a lock for consistency");
3450 if (_jvmci_installed_code != NULL) {
3451 // This must be done carefully to maintain nmethod remembered sets properly
3452 BarrierSet* bs = Universe::heap()->barrier_set();
3453 bs->write_ref_nmethod_pre(&_jvmci_installed_code, this);
3454 _jvmci_installed_code = NULL;
3455 bs->write_ref_nmethod_post(&_jvmci_installed_code, this);
3456 }
3457 }
3458
3459 void nmethod::maybe_invalidate_installed_code() {
3460 assert(Patching_lock->is_locked() ||
3461 SafepointSynchronize::is_at_safepoint(), "should be performed under a lock for consistency");
3462 oop installed_code = jvmci_installed_code();
3463 if (installed_code != NULL) {
3464 nmethod* nm = (nmethod*)InstalledCode::address(installed_code);
3465 if (nm == NULL || nm != this) {
3466 // The link has been broken or the InstalledCode instance is
3467 // associated with another nmethod so do nothing.
3468 return;
3469 }
3470 if (!is_alive()) {
3471 // Break the link between nmethod and InstalledCode such that the nmethod
3472 // can subsequently be flushed safely. The link must be maintained while
3473 // the method could have live activations since invalidateInstalledCode
3474 // might want to invalidate all existing activations.
3475 InstalledCode::set_address(installed_code, 0);
3476 InstalledCode::set_entryPoint(installed_code, 0);
3477 } else if (is_not_entrant()) {
3478 // Remove the entry point so any invocation will fail but keep
3479 // the address link around that so that existing activations can
3480 // be invalidated.
3481 InstalledCode::set_entryPoint(installed_code, 0);
3482 }
3483 }
3484 }
3485
3486 void nmethod::invalidate_installed_code(Handle installedCode, TRAPS) {
3487 if (installedCode() == NULL) {
3488 THROW(vmSymbols::java_lang_NullPointerException());
3489 }
3490 jlong nativeMethod = InstalledCode::address(installedCode);
3491 nmethod* nm = (nmethod*)nativeMethod;
3492 if (nm == NULL) {
3493 // Nothing to do
3494 return;
3495 }
3496
3497 nmethodLocker nml(nm);
3498 #ifdef ASSERT
3499 {
3500 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
3501 // This relationship can only be checked safely under a lock
3502 assert(nm == NULL || !nm->is_alive() || nm->jvmci_installed_code() == installedCode(), "sanity check");
3503 }
3504 #endif
3505
3506 if (nm->is_alive()) {
3507 // The nmethod state machinery maintains the link between the
3508 // HotSpotInstalledCode and nmethod* so as long as the nmethod appears to be
3509 // alive assume there is work to do and deoptimize the nmethod.
3510 nm->mark_for_deoptimization();
3511 VM_Deoptimize op;
3512 VMThread::execute(&op);
3513 }
3514
3515 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
3516 // Check that it's still associated with the same nmethod and break
3517 // the link if it is.
3518 if (InstalledCode::address(installedCode) == nativeMethod) {
3519 InstalledCode::set_address(installedCode, 0);
3520 }
3521 }
3522
3523 char* nmethod::jvmci_installed_code_name(char* buf, size_t buflen) {
3524 if (!this->is_compiled_by_jvmci()) {
3525 return NULL;
3526 }
3527 oop installedCode = this->jvmci_installed_code();
3528 if (installedCode != NULL) {
3529 oop installedCodeName = NULL;
3530 if (installedCode->is_a(InstalledCode::klass())) {
3531 installedCodeName = InstalledCode::name(installedCode);
3532 }
3533 if (installedCodeName != NULL) {
3534 return java_lang_String::as_utf8_string(installedCodeName, buf, (int)buflen);
3535 } else {
3536 jio_snprintf(buf, buflen, "null");
3537 return buf;
3538 }
3539 }
3540 jio_snprintf(buf, buflen, "noInstalledCode");
3541 return buf;
3542 }
3543 #endif
3544
3545 Method* nmethod::attached_method(address call_instr) {
3546 assert(code_contains(call_instr), "not part of the nmethod");
3547 RelocIterator iter(this, call_instr, call_instr + 1);
3548 while (iter.next()) {
3549 if (iter.addr() == call_instr) {
3550 switch(iter.type()) {
3551 case relocInfo::static_call_type: return iter.static_call_reloc()->method_value();
3552 case relocInfo::opt_virtual_call_type: return iter.opt_virtual_call_reloc()->method_value();
3553 case relocInfo::virtual_call_type: return iter.virtual_call_reloc()->method_value();
3554 }
3555 }
3556 }
3557 return NULL; // not found
3558 }
3559
3560 Method* nmethod::attached_method_before_pc(address pc) {
3561 if (NativeCall::is_call_before(pc)) {
3562 NativeCall* ncall = nativeCall_before(pc);
3563 return attached_method(ncall->instruction_address());
3564 }
3565 return NULL; // not a call
3566 }
3567