1 /*
2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "code/codeCache.hpp"
27 #include "code/compiledIC.hpp"
28 #include "code/dependencies.hpp"
29 #include "code/nativeInst.hpp"
30 #include "code/nmethod.hpp"
31 #include "code/scopeDesc.hpp"
32 #include "compiler/abstractCompiler.hpp"
33 #include "compiler/compileBroker.hpp"
34 #include "compiler/compileLog.hpp"
35 #include "compiler/compilerDirectives.hpp"
36 #include "compiler/disassembler.hpp"
37 #include "interpreter/bytecode.hpp"
38 #include "oops/methodData.hpp"
39 #include "oops/oop.inline.hpp"
40 #include "prims/jvmtiRedefineClassesTrace.hpp"
41 #include "prims/jvmtiImpl.hpp"
42 #include "runtime/atomic.inline.hpp"
43 #include "runtime/orderAccess.inline.hpp"
44 #include "runtime/sharedRuntime.hpp"
45 #include "runtime/sweeper.hpp"
46 #include "utilities/resourceHash.hpp"
47 #include "utilities/dtrace.hpp"
48 #include "utilities/events.hpp"
49 #include "utilities/xmlstream.hpp"
50 #ifdef TARGET_ARCH_x86
51 # include "nativeInst_x86.hpp"
52 #endif
53 #ifdef TARGET_ARCH_sparc
54 # include "nativeInst_sparc.hpp"
55 #endif
56 #ifdef TARGET_ARCH_zero
57 # include "nativeInst_zero.hpp"
58 #endif
59 #ifdef TARGET_ARCH_arm
60 # include "nativeInst_arm.hpp"
61 #endif
62 #ifdef TARGET_ARCH_ppc
63 # include "nativeInst_ppc.hpp"
64 #endif
65 #ifdef SHARK
66 #include "shark/sharkCompiler.hpp"
67 #endif
68 #if INCLUDE_JVMCI
69 #include "jvmci/jvmciJavaClasses.hpp"
70 #endif
71
72 unsigned char nmethod::_global_unloading_clock = 0;
73
74 #ifdef DTRACE_ENABLED
75
76 // Only bother with this argument setup if dtrace is available
77
78 #define DTRACE_METHOD_UNLOAD_PROBE(method) \
79 { \
80 Method* m = (method); \
81 if (m != NULL) { \
82 Symbol* klass_name = m->klass_name(); \
83 Symbol* name = m->name(); \
84 Symbol* signature = m->signature(); \
85 HOTSPOT_COMPILED_METHOD_UNLOAD( \
86 (char *) klass_name->bytes(), klass_name->utf8_length(), \
87 (char *) name->bytes(), name->utf8_length(), \
88 (char *) signature->bytes(), signature->utf8_length()); \
89 } \
90 }
91
92 #else // ndef DTRACE_ENABLED
93
94 #define DTRACE_METHOD_UNLOAD_PROBE(method)
95
96 #endif
97
98 bool nmethod::is_compiled_by_c1() const {
99 if (compiler() == NULL) {
100 return false;
101 }
102 return compiler()->is_c1();
103 }
104 bool nmethod::is_compiled_by_jvmci() const {
105 if (compiler() == NULL || method() == NULL) return false; // can happen during debug printing
106 if (is_native_method()) return false;
107 return compiler()->is_jvmci();
108 }
109 bool nmethod::is_compiled_by_c2() const {
110 if (compiler() == NULL) {
111 return false;
112 }
113 return compiler()->is_c2();
114 }
115 bool nmethod::is_compiled_by_shark() const {
116 if (compiler() == NULL) {
117 return false;
118 }
119 return compiler()->is_shark();
120 }
121
122
123
124 //---------------------------------------------------------------------------------
125 // NMethod statistics
126 // They are printed under various flags, including:
127 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation.
128 // (In the latter two cases, they like other stats are printed to the log only.)
129
130 #ifndef PRODUCT
131 // These variables are put into one block to reduce relocations
132 // and make it simpler to print from the debugger.
133 struct java_nmethod_stats_struct {
134 int nmethod_count;
135 int total_size;
136 int relocation_size;
137 int consts_size;
138 int insts_size;
139 int stub_size;
140 int scopes_data_size;
141 int scopes_pcs_size;
142 int dependencies_size;
143 int handler_table_size;
144 int nul_chk_table_size;
145 int oops_size;
146 int metadata_size;
147
148 void note_nmethod(nmethod* nm) {
149 nmethod_count += 1;
150 total_size += nm->size();
151 relocation_size += nm->relocation_size();
152 consts_size += nm->consts_size();
153 insts_size += nm->insts_size();
154 stub_size += nm->stub_size();
155 oops_size += nm->oops_size();
156 metadata_size += nm->metadata_size();
157 scopes_data_size += nm->scopes_data_size();
158 scopes_pcs_size += nm->scopes_pcs_size();
159 dependencies_size += nm->dependencies_size();
160 handler_table_size += nm->handler_table_size();
161 nul_chk_table_size += nm->nul_chk_table_size();
162 }
163 void print_nmethod_stats(const char* name) {
164 if (nmethod_count == 0) return;
165 tty->print_cr("Statistics for %d bytecoded nmethods for %s:", nmethod_count, name);
166 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size);
167 if (nmethod_count != 0) tty->print_cr(" header = " SIZE_FORMAT, nmethod_count * sizeof(nmethod));
168 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size);
169 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size);
170 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size);
171 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size);
172 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size);
173 if (metadata_size != 0) tty->print_cr(" metadata = %d", metadata_size);
174 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size);
175 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size);
176 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size);
177 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size);
178 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size);
179 }
180 };
181
182 struct native_nmethod_stats_struct {
183 int native_nmethod_count;
184 int native_total_size;
185 int native_relocation_size;
186 int native_insts_size;
187 int native_oops_size;
188 int native_metadata_size;
189 void note_native_nmethod(nmethod* nm) {
190 native_nmethod_count += 1;
191 native_total_size += nm->size();
192 native_relocation_size += nm->relocation_size();
193 native_insts_size += nm->insts_size();
194 native_oops_size += nm->oops_size();
195 native_metadata_size += nm->metadata_size();
196 }
197 void print_native_nmethod_stats() {
198 if (native_nmethod_count == 0) return;
199 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count);
200 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size);
201 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size);
202 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size);
203 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size);
204 if (native_metadata_size != 0) tty->print_cr(" N. metadata = %d", native_metadata_size);
205 }
206 };
207
208 struct pc_nmethod_stats_struct {
209 int pc_desc_resets; // number of resets (= number of caches)
210 int pc_desc_queries; // queries to nmethod::find_pc_desc
211 int pc_desc_approx; // number of those which have approximate true
212 int pc_desc_repeats; // number of _pc_descs[0] hits
213 int pc_desc_hits; // number of LRU cache hits
214 int pc_desc_tests; // total number of PcDesc examinations
215 int pc_desc_searches; // total number of quasi-binary search steps
216 int pc_desc_adds; // number of LUR cache insertions
217
218 void print_pc_stats() {
219 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query",
220 pc_desc_queries,
221 (double)(pc_desc_tests + pc_desc_searches)
222 / pc_desc_queries);
223 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d",
224 pc_desc_resets,
225 pc_desc_queries, pc_desc_approx,
226 pc_desc_repeats, pc_desc_hits,
227 pc_desc_tests, pc_desc_searches, pc_desc_adds);
228 }
229 };
230
231 #ifdef COMPILER1
232 static java_nmethod_stats_struct c1_java_nmethod_stats;
233 #endif
234 #ifdef COMPILER2
235 static java_nmethod_stats_struct c2_java_nmethod_stats;
236 #endif
237 #if INCLUDE_JVMCI
238 static java_nmethod_stats_struct jvmci_java_nmethod_stats;
239 #endif
240 #ifdef SHARK
241 static java_nmethod_stats_struct shark_java_nmethod_stats;
242 #endif
243 static java_nmethod_stats_struct unknown_java_nmethod_stats;
244
245 static native_nmethod_stats_struct native_nmethod_stats;
246 static pc_nmethod_stats_struct pc_nmethod_stats;
247
248 static void note_java_nmethod(nmethod* nm) {
249 #ifdef COMPILER1
250 if (nm->is_compiled_by_c1()) {
251 c1_java_nmethod_stats.note_nmethod(nm);
252 } else
253 #endif
254 #ifdef COMPILER2
255 if (nm->is_compiled_by_c2()) {
256 c2_java_nmethod_stats.note_nmethod(nm);
257 } else
258 #endif
259 #if INCLUDE_JVMCI
260 if (nm->is_compiled_by_jvmci()) {
261 jvmci_java_nmethod_stats.note_nmethod(nm);
262 } else
263 #endif
264 #ifdef SHARK
265 if (nm->is_compiled_by_shark()) {
266 shark_java_nmethod_stats.note_nmethod(nm);
267 } else
268 #endif
269 {
270 unknown_java_nmethod_stats.note_nmethod(nm);
271 }
272 }
273 #endif // !PRODUCT
274
275 //---------------------------------------------------------------------------------
276
277
278 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) {
279 assert(pc != NULL, "Must be non null");
280 assert(exception.not_null(), "Must be non null");
281 assert(handler != NULL, "Must be non null");
282
283 _count = 0;
284 _exception_type = exception->klass();
285 _next = NULL;
286
287 add_address_and_handler(pc,handler);
288 }
289
290
291 address ExceptionCache::match(Handle exception, address pc) {
292 assert(pc != NULL,"Must be non null");
293 assert(exception.not_null(),"Must be non null");
294 if (exception->klass() == exception_type()) {
295 return (test_address(pc));
296 }
297
298 return NULL;
299 }
300
301
302 bool ExceptionCache::match_exception_with_space(Handle exception) {
303 assert(exception.not_null(),"Must be non null");
304 if (exception->klass() == exception_type() && count() < cache_size) {
305 return true;
306 }
307 return false;
308 }
309
310
311 address ExceptionCache::test_address(address addr) {
312 for (int i=0; i<count(); i++) {
313 if (pc_at(i) == addr) {
314 return handler_at(i);
315 }
316 }
317 return NULL;
318 }
319
320
321 bool ExceptionCache::add_address_and_handler(address addr, address handler) {
322 if (test_address(addr) == handler) return true;
323 if (count() < cache_size) {
324 set_pc_at(count(),addr);
325 set_handler_at(count(), handler);
326 increment_count();
327 return true;
328 }
329 return false;
330 }
331
332
333 // private method for handling exception cache
334 // These methods are private, and used to manipulate the exception cache
335 // directly.
336 ExceptionCache* nmethod::exception_cache_entry_for_exception(Handle exception) {
337 ExceptionCache* ec = exception_cache();
338 while (ec != NULL) {
339 if (ec->match_exception_with_space(exception)) {
340 return ec;
341 }
342 ec = ec->next();
343 }
344 return NULL;
345 }
346
347
348 //-----------------------------------------------------------------------------
349
350
351 // Helper used by both find_pc_desc methods.
352 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) {
353 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_tests);
354 if (!approximate)
355 return pc->pc_offset() == pc_offset;
356 else
357 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset();
358 }
359
360 void PcDescCache::reset_to(PcDesc* initial_pc_desc) {
361 if (initial_pc_desc == NULL) {
362 _pc_descs[0] = NULL; // native method; no PcDescs at all
363 return;
364 }
365 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_resets);
366 // reset the cache by filling it with benign (non-null) values
367 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel");
368 for (int i = 0; i < cache_size; i++)
369 _pc_descs[i] = initial_pc_desc;
370 }
371
372 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) {
373 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_queries);
374 NOT_PRODUCT(if (approximate) ++pc_nmethod_stats.pc_desc_approx);
375
376 // Note: one might think that caching the most recently
377 // read value separately would be a win, but one would be
378 // wrong. When many threads are updating it, the cache
379 // line it's in would bounce between caches, negating
380 // any benefit.
381
382 // In order to prevent race conditions do not load cache elements
383 // repeatedly, but use a local copy:
384 PcDesc* res;
385
386 // Step one: Check the most recently added value.
387 res = _pc_descs[0];
388 if (res == NULL) return NULL; // native method; no PcDescs at all
389 if (match_desc(res, pc_offset, approximate)) {
390 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_repeats);
391 return res;
392 }
393
394 // Step two: Check the rest of the LRU cache.
395 for (int i = 1; i < cache_size; ++i) {
396 res = _pc_descs[i];
397 if (res->pc_offset() < 0) break; // optimization: skip empty cache
398 if (match_desc(res, pc_offset, approximate)) {
399 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_hits);
400 return res;
401 }
402 }
403
404 // Report failure.
405 return NULL;
406 }
407
408 void PcDescCache::add_pc_desc(PcDesc* pc_desc) {
409 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_adds);
410 // Update the LRU cache by shifting pc_desc forward.
411 for (int i = 0; i < cache_size; i++) {
412 PcDesc* next = _pc_descs[i];
413 _pc_descs[i] = pc_desc;
414 pc_desc = next;
415 }
416 }
417
418 // adjust pcs_size so that it is a multiple of both oopSize and
419 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple
420 // of oopSize, then 2*sizeof(PcDesc) is)
421 static int adjust_pcs_size(int pcs_size) {
422 int nsize = round_to(pcs_size, oopSize);
423 if ((nsize % sizeof(PcDesc)) != 0) {
424 nsize = pcs_size + sizeof(PcDesc);
425 }
426 assert((nsize % oopSize) == 0, "correct alignment");
427 return nsize;
428 }
429
430 //-----------------------------------------------------------------------------
431
432
433 void nmethod::add_exception_cache_entry(ExceptionCache* new_entry) {
434 assert(ExceptionCache_lock->owned_by_self(),"Must hold the ExceptionCache_lock");
435 assert(new_entry != NULL,"Must be non null");
436 assert(new_entry->next() == NULL, "Must be null");
437
438 if (exception_cache() != NULL) {
439 new_entry->set_next(exception_cache());
440 }
441 set_exception_cache(new_entry);
442 }
443
444 void nmethod::clean_exception_cache(BoolObjectClosure* is_alive) {
445 ExceptionCache* prev = NULL;
446 ExceptionCache* curr = exception_cache();
447
448 while (curr != NULL) {
449 ExceptionCache* next = curr->next();
450
451 Klass* ex_klass = curr->exception_type();
452 if (ex_klass != NULL && !ex_klass->is_loader_alive(is_alive)) {
453 if (prev == NULL) {
454 set_exception_cache(next);
455 } else {
456 prev->set_next(next);
457 }
458 delete curr;
459 // prev stays the same.
460 } else {
461 prev = curr;
462 }
463
464 curr = next;
465 }
466 }
467
468 // public method for accessing the exception cache
469 // These are the public access methods.
470 address nmethod::handler_for_exception_and_pc(Handle exception, address pc) {
471 // We never grab a lock to read the exception cache, so we may
472 // have false negatives. This is okay, as it can only happen during
473 // the first few exception lookups for a given nmethod.
474 ExceptionCache* ec = exception_cache();
475 while (ec != NULL) {
476 address ret_val;
477 if ((ret_val = ec->match(exception,pc)) != NULL) {
478 return ret_val;
479 }
480 ec = ec->next();
481 }
482 return NULL;
483 }
484
485
486 void nmethod::add_handler_for_exception_and_pc(Handle exception, address pc, address handler) {
487 // There are potential race conditions during exception cache updates, so we
488 // must own the ExceptionCache_lock before doing ANY modifications. Because
489 // we don't lock during reads, it is possible to have several threads attempt
490 // to update the cache with the same data. We need to check for already inserted
491 // copies of the current data before adding it.
492
493 MutexLocker ml(ExceptionCache_lock);
494 ExceptionCache* target_entry = exception_cache_entry_for_exception(exception);
495
496 if (target_entry == NULL || !target_entry->add_address_and_handler(pc,handler)) {
497 target_entry = new ExceptionCache(exception,pc,handler);
498 add_exception_cache_entry(target_entry);
499 }
500 }
501
502
503 //-------------end of code for ExceptionCache--------------
504
505
506 int nmethod::total_size() const {
507 return
508 consts_size() +
509 insts_size() +
510 stub_size() +
511 scopes_data_size() +
512 scopes_pcs_size() +
513 handler_table_size() +
514 nul_chk_table_size();
515 }
516
517 const char* nmethod::compile_kind() const {
518 if (is_osr_method()) return "osr";
519 if (method() != NULL && is_native_method()) return "c2n";
520 return NULL;
521 }
522
523 // Fill in default values for various flag fields
524 void nmethod::init_defaults() {
525 _state = in_use;
526 _unloading_clock = 0;
527 _marked_for_reclamation = 0;
528 _has_flushed_dependencies = 0;
529 _has_unsafe_access = 0;
530 _has_method_handle_invokes = 0;
531 _lazy_critical_native = 0;
532 _has_wide_vectors = 0;
533 _marked_for_deoptimization = 0;
534 _lock_count = 0;
535 _stack_traversal_mark = 0;
536 _unload_reported = false; // jvmti state
537
538 #ifdef ASSERT
539 _oops_are_stale = false;
540 #endif
541
542 _oops_do_mark_link = NULL;
543 _jmethod_id = NULL;
544 _osr_link = NULL;
545 if (UseG1GC) {
546 _unloading_next = NULL;
547 } else {
548 _scavenge_root_link = NULL;
549 }
550 _scavenge_root_state = 0;
551 _compiler = NULL;
552 #if INCLUDE_RTM_OPT
553 _rtm_state = NoRTM;
554 #endif
555 #if INCLUDE_JVMCI
556 _jvmci_installed_code = NULL;
557 _speculation_log = NULL;
558 #endif
559 }
560
561 nmethod* nmethod::new_native_nmethod(methodHandle method,
562 int compile_id,
563 CodeBuffer *code_buffer,
564 int vep_offset,
565 int frame_complete,
566 int frame_size,
567 ByteSize basic_lock_owner_sp_offset,
568 ByteSize basic_lock_sp_offset,
569 OopMapSet* oop_maps) {
570 code_buffer->finalize_oop_references(method);
571 // create nmethod
572 nmethod* nm = NULL;
573 {
574 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
575 int native_nmethod_size = allocation_size(code_buffer, sizeof(nmethod));
576 CodeOffsets offsets;
577 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
578 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
579 nm = new (native_nmethod_size, CompLevel_none) nmethod(method(), native_nmethod_size,
580 compile_id, &offsets,
581 code_buffer, frame_size,
582 basic_lock_owner_sp_offset,
583 basic_lock_sp_offset, oop_maps);
584 NOT_PRODUCT(if (nm != NULL) native_nmethod_stats.note_native_nmethod(nm));
585 }
586 // verify nmethod
587 debug_only(if (nm) nm->verify();) // might block
588
589 if (nm != NULL) {
590 nm->log_new_nmethod();
591 }
592
593 return nm;
594 }
595
596 nmethod* nmethod::new_nmethod(methodHandle method,
597 int compile_id,
598 int entry_bci,
599 CodeOffsets* offsets,
600 int orig_pc_offset,
601 DebugInformationRecorder* debug_info,
602 Dependencies* dependencies,
603 CodeBuffer* code_buffer, int frame_size,
604 OopMapSet* oop_maps,
605 ExceptionHandlerTable* handler_table,
606 ImplicitExceptionTable* nul_chk_table,
607 AbstractCompiler* compiler,
608 int comp_level
609 #if INCLUDE_JVMCI
610 , Handle installed_code,
611 Handle speculationLog
612 #endif
613 )
614 {
615 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
616 code_buffer->finalize_oop_references(method);
617 // create nmethod
618 nmethod* nm = NULL;
619 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
620 int nmethod_size =
621 allocation_size(code_buffer, sizeof(nmethod))
622 + adjust_pcs_size(debug_info->pcs_size())
623 + round_to(dependencies->size_in_bytes() , oopSize)
624 + round_to(handler_table->size_in_bytes(), oopSize)
625 + round_to(nul_chk_table->size_in_bytes(), oopSize)
626 + round_to(debug_info->data_size() , oopSize);
627
628 nm = new (nmethod_size, comp_level)
629 nmethod(method(), nmethod_size, compile_id, entry_bci, offsets,
630 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size,
631 oop_maps,
632 handler_table,
633 nul_chk_table,
634 compiler,
635 comp_level
636 #if INCLUDE_JVMCI
637 , installed_code,
638 speculationLog
639 #endif
640 );
641
642 if (nm != NULL) {
643 // To make dependency checking during class loading fast, record
644 // the nmethod dependencies in the classes it is dependent on.
645 // This allows the dependency checking code to simply walk the
646 // class hierarchy above the loaded class, checking only nmethods
647 // which are dependent on those classes. The slow way is to
648 // check every nmethod for dependencies which makes it linear in
649 // the number of methods compiled. For applications with a lot
650 // classes the slow way is too slow.
651 for (Dependencies::DepStream deps(nm); deps.next(); ) {
652 if (deps.type() == Dependencies::call_site_target_value) {
653 // CallSite dependencies are managed on per-CallSite instance basis.
654 oop call_site = deps.argument_oop(0);
655 MethodHandles::add_dependent_nmethod(call_site, nm);
656 } else {
657 Klass* klass = deps.context_type();
658 if (klass == NULL) {
659 continue; // ignore things like evol_method
660 }
661 // record this nmethod as dependent on this klass
662 InstanceKlass::cast(klass)->add_dependent_nmethod(nm);
663 }
664 }
665 NOT_PRODUCT(if (nm != NULL) note_java_nmethod(nm));
666 }
667 }
668 // Do verification and logging outside CodeCache_lock.
669 if (nm != NULL) {
670 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
671 DEBUG_ONLY(nm->verify();)
672 nm->log_new_nmethod();
673 }
674 return nm;
675 }
676
677 #ifdef _MSC_VER
678 #pragma warning(push)
679 #pragma warning(disable:4355) // warning C4355: 'this' : used in base member initializer list
680 #endif
681 // For native wrappers
682 nmethod::nmethod(
683 Method* method,
684 int nmethod_size,
685 int compile_id,
686 CodeOffsets* offsets,
687 CodeBuffer* code_buffer,
688 int frame_size,
689 ByteSize basic_lock_owner_sp_offset,
690 ByteSize basic_lock_sp_offset,
691 OopMapSet* oop_maps )
692 : CodeBlob("native nmethod", code_buffer, sizeof(nmethod),
693 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps),
694 _native_receiver_sp_offset(basic_lock_owner_sp_offset),
695 _native_basic_lock_sp_offset(basic_lock_sp_offset)
696 {
697 {
698 debug_only(No_Safepoint_Verifier nsv;)
699 assert_locked_or_safepoint(CodeCache_lock);
700
701 init_defaults();
702 _method = method;
703 _entry_bci = InvocationEntryBci;
704 // We have no exception handler or deopt handler make the
705 // values something that will never match a pc like the nmethod vtable entry
706 _exception_offset = 0;
707 _deoptimize_offset = 0;
708 _deoptimize_mh_offset = 0;
709 _orig_pc_offset = 0;
710
711 _consts_offset = data_offset();
712 _stub_offset = data_offset();
713 _oops_offset = data_offset();
714 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize);
715 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize);
716 _scopes_pcs_offset = _scopes_data_offset;
717 _dependencies_offset = _scopes_pcs_offset;
718 _handler_table_offset = _dependencies_offset;
719 _nul_chk_table_offset = _handler_table_offset;
720 _nmethod_end_offset = _nul_chk_table_offset;
721 _compile_id = compile_id;
722 _comp_level = CompLevel_none;
723 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
724 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
725 _osr_entry_point = NULL;
726 _exception_cache = NULL;
727 _pc_desc_cache.reset_to(NULL);
728 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
729
730 code_buffer->copy_values_to(this);
731 if (ScavengeRootsInCode) {
732 if (detect_scavenge_root_oops()) {
733 CodeCache::add_scavenge_root_nmethod(this);
734 }
735 Universe::heap()->register_nmethod(this);
736 }
737 debug_only(verify_scavenge_root_oops());
738 CodeCache::commit(this);
739 }
740
741 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
742 ttyLocker ttyl; // keep the following output all in one block
743 // This output goes directly to the tty, not the compiler log.
744 // To enable tools to match it up with the compilation activity,
745 // be sure to tag this tty output with the compile ID.
746 if (xtty != NULL) {
747 xtty->begin_head("print_native_nmethod");
748 xtty->method(_method);
749 xtty->stamp();
750 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
751 }
752 // print the header part first
753 print();
754 // then print the requested information
755 if (PrintNativeNMethods) {
756 print_code();
757 if (oop_maps != NULL) {
758 oop_maps->print();
759 }
760 }
761 if (PrintRelocations) {
762 print_relocations();
763 }
764 if (xtty != NULL) {
765 xtty->tail("print_native_nmethod");
766 }
767 }
768 }
769
770 #ifdef _MSC_VER
771 #pragma warning(pop)
772 #endif
773
774 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () {
775 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level));
776 }
777
778 nmethod::nmethod(
779 Method* method,
780 int nmethod_size,
781 int compile_id,
782 int entry_bci,
783 CodeOffsets* offsets,
784 int orig_pc_offset,
785 DebugInformationRecorder* debug_info,
786 Dependencies* dependencies,
787 CodeBuffer *code_buffer,
788 int frame_size,
789 OopMapSet* oop_maps,
790 ExceptionHandlerTable* handler_table,
791 ImplicitExceptionTable* nul_chk_table,
792 AbstractCompiler* compiler,
793 int comp_level
794 #if INCLUDE_JVMCI
795 , Handle installed_code,
796 Handle speculation_log
797 #endif
798 )
799 : CodeBlob("nmethod", code_buffer, sizeof(nmethod),
800 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps),
801 _native_receiver_sp_offset(in_ByteSize(-1)),
802 _native_basic_lock_sp_offset(in_ByteSize(-1))
803 {
804 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
805 {
806 debug_only(No_Safepoint_Verifier nsv;)
807 assert_locked_or_safepoint(CodeCache_lock);
808
809 init_defaults();
810 _method = method;
811 _entry_bci = entry_bci;
812 _compile_id = compile_id;
813 _comp_level = comp_level;
814 _compiler = compiler;
815 _orig_pc_offset = orig_pc_offset;
816 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
817
818 // Section offsets
819 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts());
820 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs());
821
822 #if INCLUDE_JVMCI
823 _jvmci_installed_code = installed_code();
824 _speculation_log = (instanceOop)speculation_log();
825
826 if (compiler->is_jvmci()) {
827 // JVMCI might not produce any stub sections
828 if (offsets->value(CodeOffsets::Exceptions) != -1) {
829 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions);
830 } else {
831 _exception_offset = -1;
832 }
833 if (offsets->value(CodeOffsets::Deopt) != -1) {
834 _deoptimize_offset = code_offset() + offsets->value(CodeOffsets::Deopt);
835 } else {
836 _deoptimize_offset = -1;
837 }
838 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
839 _deoptimize_mh_offset = code_offset() + offsets->value(CodeOffsets::DeoptMH);
840 } else {
841 _deoptimize_mh_offset = -1;
842 }
843 } else {
844 #endif
845 // Exception handler and deopt handler are in the stub section
846 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set");
847 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set");
848
849 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
850 _deoptimize_offset = _stub_offset + offsets->value(CodeOffsets::Deopt);
851 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
852 _deoptimize_mh_offset = _stub_offset + offsets->value(CodeOffsets::DeoptMH);
853 } else {
854 _deoptimize_mh_offset = -1;
855 #if INCLUDE_JVMCI
856 }
857 #endif
858 }
859 if (offsets->value(CodeOffsets::UnwindHandler) != -1) {
860 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler);
861 } else {
862 _unwind_handler_offset = -1;
863 }
864
865 _oops_offset = data_offset();
866 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize);
867 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize);
868
869 _scopes_pcs_offset = _scopes_data_offset + round_to(debug_info->data_size (), oopSize);
870 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
871 _handler_table_offset = _dependencies_offset + round_to(dependencies->size_in_bytes (), oopSize);
872 _nul_chk_table_offset = _handler_table_offset + round_to(handler_table->size_in_bytes(), oopSize);
873 _nmethod_end_offset = _nul_chk_table_offset + round_to(nul_chk_table->size_in_bytes(), oopSize);
874
875 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
876 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
877 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry);
878 _exception_cache = NULL;
879 _pc_desc_cache.reset_to(scopes_pcs_begin());
880
881 // Copy contents of ScopeDescRecorder to nmethod
882 code_buffer->copy_values_to(this);
883 debug_info->copy_to(this);
884 dependencies->copy_to(this);
885 if (ScavengeRootsInCode) {
886 if (detect_scavenge_root_oops()) {
887 CodeCache::add_scavenge_root_nmethod(this);
888 }
889 Universe::heap()->register_nmethod(this);
890 }
891 debug_only(verify_scavenge_root_oops());
892
893 CodeCache::commit(this);
894
895 // Copy contents of ExceptionHandlerTable to nmethod
896 handler_table->copy_to(this);
897 nul_chk_table->copy_to(this);
898
899 // we use the information of entry points to find out if a method is
900 // static or non static
901 assert(compiler->is_c2() || compiler->is_jvmci() ||
902 _method->is_static() == (entry_point() == _verified_entry_point),
903 " entry points must be same for static methods and vice versa");
904 }
905 }
906
907 // Print a short set of xml attributes to identify this nmethod. The
908 // output should be embedded in some other element.
909 void nmethod::log_identity(xmlStream* log) const {
910 log->print(" compile_id='%d'", compile_id());
911 const char* nm_kind = compile_kind();
912 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind);
913 if (compiler() != NULL) {
914 log->print(" compiler='%s'", compiler()->name());
915 }
916 if (TieredCompilation) {
917 log->print(" level='%d'", comp_level());
918 }
919 }
920
921
922 #define LOG_OFFSET(log, name) \
923 if (p2i(name##_end()) - p2i(name##_begin())) \
924 log->print(" " XSTR(name) "_offset='" INTX_FORMAT "'" , \
925 p2i(name##_begin()) - p2i(this))
926
927
928 void nmethod::log_new_nmethod() const {
929 if (LogCompilation && xtty != NULL) {
930 ttyLocker ttyl;
931 HandleMark hm;
932 xtty->begin_elem("nmethod");
933 log_identity(xtty);
934 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size());
935 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this));
936
937 LOG_OFFSET(xtty, relocation);
938 LOG_OFFSET(xtty, consts);
939 LOG_OFFSET(xtty, insts);
940 LOG_OFFSET(xtty, stub);
941 LOG_OFFSET(xtty, scopes_data);
942 LOG_OFFSET(xtty, scopes_pcs);
943 LOG_OFFSET(xtty, dependencies);
944 LOG_OFFSET(xtty, handler_table);
945 LOG_OFFSET(xtty, nul_chk_table);
946 LOG_OFFSET(xtty, oops);
947 LOG_OFFSET(xtty, metadata);
948
949 xtty->method(method());
950 xtty->stamp();
951 xtty->end_elem();
952 }
953 }
954
955 #undef LOG_OFFSET
956
957
958 // Print out more verbose output usually for a newly created nmethod.
959 void nmethod::print_on(outputStream* st, const char* msg) const {
960 if (st != NULL) {
961 ttyLocker ttyl;
962 if (WizardMode) {
963 CompileTask::print(st, this, msg, /*short_form:*/ true);
964 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this));
965 } else {
966 CompileTask::print(st, this, msg, /*short_form:*/ false);
967 }
968 }
969 }
970
971
972 void nmethod::print_nmethod(bool printmethod) {
973 ttyLocker ttyl; // keep the following output all in one block
974 if (xtty != NULL) {
975 xtty->begin_head("print_nmethod");
976 xtty->stamp();
977 xtty->end_head();
978 }
979 // print the header part first
980 print();
981 // then print the requested information
982 if (printmethod) {
983 print_code();
984 print_pcs();
985 if (oop_maps()) {
986 oop_maps()->print();
987 }
988 }
989 if (PrintDebugInfo || CompilerOracle::has_option_string(_method, "PrintDebugInfo")) {
990 print_scopes();
991 }
992 if (PrintRelocations || CompilerOracle::has_option_string(_method, "PrintRelocations")) {
993 print_relocations();
994 }
995 if (PrintDependencies || CompilerOracle::has_option_string(_method, "PrintDependencies")) {
996 print_dependencies();
997 }
998 if (PrintExceptionHandlers) {
999 print_handler_table();
1000 print_nul_chk_table();
1001 }
1002 if (xtty != NULL) {
1003 xtty->tail("print_nmethod");
1004 }
1005 }
1006
1007
1008 // Promote one word from an assembly-time handle to a live embedded oop.
1009 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
1010 if (handle == NULL ||
1011 // As a special case, IC oops are initialized to 1 or -1.
1012 handle == (jobject) Universe::non_oop_word()) {
1013 (*dest) = (oop) handle;
1014 } else {
1015 (*dest) = JNIHandles::resolve_non_null(handle);
1016 }
1017 }
1018
1019
1020 // Have to have the same name because it's called by a template
1021 void nmethod::copy_values(GrowableArray<jobject>* array) {
1022 int length = array->length();
1023 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
1024 oop* dest = oops_begin();
1025 for (int index = 0 ; index < length; index++) {
1026 initialize_immediate_oop(&dest[index], array->at(index));
1027 }
1028
1029 // Now we can fix up all the oops in the code. We need to do this
1030 // in the code because the assembler uses jobjects as placeholders.
1031 // The code and relocations have already been initialized by the
1032 // CodeBlob constructor, so it is valid even at this early point to
1033 // iterate over relocations and patch the code.
1034 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true);
1035 }
1036
1037 void nmethod::copy_values(GrowableArray<Metadata*>* array) {
1038 int length = array->length();
1039 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough");
1040 Metadata** dest = metadata_begin();
1041 for (int index = 0 ; index < length; index++) {
1042 dest[index] = array->at(index);
1043 }
1044 }
1045
1046 bool nmethod::is_at_poll_return(address pc) {
1047 RelocIterator iter(this, pc, pc+1);
1048 while (iter.next()) {
1049 if (iter.type() == relocInfo::poll_return_type)
1050 return true;
1051 }
1052 return false;
1053 }
1054
1055
1056 bool nmethod::is_at_poll_or_poll_return(address pc) {
1057 RelocIterator iter(this, pc, pc+1);
1058 while (iter.next()) {
1059 relocInfo::relocType t = iter.type();
1060 if (t == relocInfo::poll_return_type || t == relocInfo::poll_type)
1061 return true;
1062 }
1063 return false;
1064 }
1065
1066
1067 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) {
1068 // re-patch all oop-bearing instructions, just in case some oops moved
1069 RelocIterator iter(this, begin, end);
1070 while (iter.next()) {
1071 if (iter.type() == relocInfo::oop_type) {
1072 oop_Relocation* reloc = iter.oop_reloc();
1073 if (initialize_immediates && reloc->oop_is_immediate()) {
1074 oop* dest = reloc->oop_addr();
1075 initialize_immediate_oop(dest, (jobject) *dest);
1076 }
1077 // Refresh the oop-related bits of this instruction.
1078 reloc->fix_oop_relocation();
1079 } else if (iter.type() == relocInfo::metadata_type) {
1080 metadata_Relocation* reloc = iter.metadata_reloc();
1081 reloc->fix_metadata_relocation();
1082 }
1083 }
1084 }
1085
1086
1087 void nmethod::verify_oop_relocations() {
1088 // Ensure sure that the code matches the current oop values
1089 RelocIterator iter(this, NULL, NULL);
1090 while (iter.next()) {
1091 if (iter.type() == relocInfo::oop_type) {
1092 oop_Relocation* reloc = iter.oop_reloc();
1093 if (!reloc->oop_is_immediate()) {
1094 reloc->verify_oop_relocation();
1095 }
1096 }
1097 }
1098 }
1099
1100
1101 ScopeDesc* nmethod::scope_desc_at(address pc) {
1102 PcDesc* pd = pc_desc_at(pc);
1103 guarantee(pd != NULL, "scope must be present");
1104 return new ScopeDesc(this, pd->scope_decode_offset(),
1105 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(),
1106 pd->return_oop());
1107 }
1108
1109
1110 void nmethod::clear_inline_caches() {
1111 assert(SafepointSynchronize::is_at_safepoint(), "cleaning of IC's only allowed at safepoint");
1112 if (is_zombie()) {
1113 return;
1114 }
1115
1116 RelocIterator iter(this);
1117 while (iter.next()) {
1118 iter.reloc()->clear_inline_cache();
1119 }
1120 }
1121
1122 // Clear ICStubs of all compiled ICs
1123 void nmethod::clear_ic_stubs() {
1124 assert_locked_or_safepoint(CompiledIC_lock);
1125 RelocIterator iter(this);
1126 while(iter.next()) {
1127 if (iter.type() == relocInfo::virtual_call_type) {
1128 CompiledIC* ic = CompiledIC_at(&iter);
1129 ic->clear_ic_stub();
1130 }
1131 }
1132 }
1133
1134
1135 void nmethod::cleanup_inline_caches() {
1136 assert_locked_or_safepoint(CompiledIC_lock);
1137
1138 // If the method is not entrant or zombie then a JMP is plastered over the
1139 // first few bytes. If an oop in the old code was there, that oop
1140 // should not get GC'd. Skip the first few bytes of oops on
1141 // not-entrant methods.
1142 address low_boundary = verified_entry_point();
1143 if (!is_in_use()) {
1144 low_boundary += NativeJump::instruction_size;
1145 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1146 // This means that the low_boundary is going to be a little too high.
1147 // This shouldn't matter, since oops of non-entrant methods are never used.
1148 // In fact, why are we bothering to look at oops in a non-entrant method??
1149 }
1150
1151 // Find all calls in an nmethod and clear the ones that point to non-entrant,
1152 // zombie and unloaded nmethods.
1153 ResourceMark rm;
1154 RelocIterator iter(this, low_boundary);
1155 while(iter.next()) {
1156 switch(iter.type()) {
1157 case relocInfo::virtual_call_type:
1158 case relocInfo::opt_virtual_call_type: {
1159 CompiledIC *ic = CompiledIC_at(&iter);
1160 // Ok, to lookup references to zombies here
1161 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
1162 if( cb != NULL && cb->is_nmethod() ) {
1163 nmethod* nm = (nmethod*)cb;
1164 // Clean inline caches pointing to zombie, non-entrant and unloaded methods
1165 if (!nm->is_in_use() || (nm->method()->code() != nm)) ic->set_to_clean(is_alive());
1166 }
1167 break;
1168 }
1169 case relocInfo::static_call_type: {
1170 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
1171 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
1172 if( cb != NULL && cb->is_nmethod() ) {
1173 nmethod* nm = (nmethod*)cb;
1174 // Clean inline caches pointing to zombie, non-entrant and unloaded methods
1175 if (!nm->is_in_use() || (nm->method()->code() != nm)) csc->set_to_clean();
1176 }
1177 break;
1178 }
1179 }
1180 }
1181 }
1182
1183 void nmethod::verify_clean_inline_caches() {
1184 assert_locked_or_safepoint(CompiledIC_lock);
1185
1186 // If the method is not entrant or zombie then a JMP is plastered over the
1187 // first few bytes. If an oop in the old code was there, that oop
1188 // should not get GC'd. Skip the first few bytes of oops on
1189 // not-entrant methods.
1190 address low_boundary = verified_entry_point();
1191 if (!is_in_use()) {
1192 low_boundary += NativeJump::instruction_size;
1193 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1194 // This means that the low_boundary is going to be a little too high.
1195 // This shouldn't matter, since oops of non-entrant methods are never used.
1196 // In fact, why are we bothering to look at oops in a non-entrant method??
1197 }
1198
1199 ResourceMark rm;
1200 RelocIterator iter(this, low_boundary);
1201 while(iter.next()) {
1202 switch(iter.type()) {
1203 case relocInfo::virtual_call_type:
1204 case relocInfo::opt_virtual_call_type: {
1205 CompiledIC *ic = CompiledIC_at(&iter);
1206 // Ok, to lookup references to zombies here
1207 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
1208 if( cb != NULL && cb->is_nmethod() ) {
1209 nmethod* nm = (nmethod*)cb;
1210 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
1211 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1212 assert(ic->is_clean(), "IC should be clean");
1213 }
1214 }
1215 break;
1216 }
1217 case relocInfo::static_call_type: {
1218 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
1219 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
1220 if( cb != NULL && cb->is_nmethod() ) {
1221 nmethod* nm = (nmethod*)cb;
1222 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
1223 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1224 assert(csc->is_clean(), "IC should be clean");
1225 }
1226 }
1227 break;
1228 }
1229 }
1230 }
1231 }
1232
1233 int nmethod::verify_icholder_relocations() {
1234 int count = 0;
1235
1236 RelocIterator iter(this);
1237 while(iter.next()) {
1238 if (iter.type() == relocInfo::virtual_call_type) {
1239 if (CompiledIC::is_icholder_call_site(iter.virtual_call_reloc())) {
1240 CompiledIC *ic = CompiledIC_at(&iter);
1241 if (TraceCompiledIC) {
1242 tty->print("noticed icholder " INTPTR_FORMAT " ", p2i(ic->cached_icholder()));
1243 ic->print();
1244 }
1245 assert(ic->cached_icholder() != NULL, "must be non-NULL");
1246 count++;
1247 }
1248 }
1249 }
1250
1251 return count;
1252 }
1253
1254 // This is a private interface with the sweeper.
1255 void nmethod::mark_as_seen_on_stack() {
1256 assert(is_alive(), "Must be an alive method");
1257 // Set the traversal mark to ensure that the sweeper does 2
1258 // cleaning passes before moving to zombie.
1259 set_stack_traversal_mark(NMethodSweeper::traversal_count());
1260 }
1261
1262 // Tell if a non-entrant method can be converted to a zombie (i.e.,
1263 // there are no activations on the stack, not in use by the VM,
1264 // and not in use by the ServiceThread)
1265 bool nmethod::can_convert_to_zombie() {
1266 assert(is_not_entrant(), "must be a non-entrant method");
1267
1268 // Since the nmethod sweeper only does partial sweep the sweeper's traversal
1269 // count can be greater than the stack traversal count before it hits the
1270 // nmethod for the second time.
1271 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count() &&
1272 !is_locked_by_vm();
1273 }
1274
1275 void nmethod::inc_decompile_count() {
1276 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return;
1277 // Could be gated by ProfileTraps, but do not bother...
1278 Method* m = method();
1279 if (m == NULL) return;
1280 MethodData* mdo = m->method_data();
1281 if (mdo == NULL) return;
1282 // There is a benign race here. See comments in methodData.hpp.
1283 mdo->inc_decompile_count();
1284 }
1285
1286 void nmethod::increase_unloading_clock() {
1287 _global_unloading_clock++;
1288 if (_global_unloading_clock == 0) {
1289 // _nmethods are allocated with _unloading_clock == 0,
1290 // so 0 is never used as a clock value.
1291 _global_unloading_clock = 1;
1292 }
1293 }
1294
1295 void nmethod::set_unloading_clock(unsigned char unloading_clock) {
1296 OrderAccess::release_store((volatile jubyte*)&_unloading_clock, unloading_clock);
1297 }
1298
1299 unsigned char nmethod::unloading_clock() {
1300 return (unsigned char)OrderAccess::load_acquire((volatile jubyte*)&_unloading_clock);
1301 }
1302
1303 void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) {
1304
1305 post_compiled_method_unload();
1306
1307 // Since this nmethod is being unloaded, make sure that dependencies
1308 // recorded in instanceKlasses get flushed and pass non-NULL closure to
1309 // indicate that this work is being done during a GC.
1310 assert(Universe::heap()->is_gc_active(), "should only be called during gc");
1311 assert(is_alive != NULL, "Should be non-NULL");
1312 // A non-NULL is_alive closure indicates that this is being called during GC.
1313 flush_dependencies(is_alive);
1314
1315 // Break cycle between nmethod & method
1316 if (TraceClassUnloading && WizardMode) {
1317 tty->print_cr("[Class unloading: Making nmethod " INTPTR_FORMAT
1318 " unloadable], Method*(" INTPTR_FORMAT
1319 "), cause(" INTPTR_FORMAT ")",
1320 p2i(this), p2i(_method), p2i(cause));
1321 if (!Universe::heap()->is_gc_active())
1322 cause->klass()->print();
1323 }
1324 // Unlink the osr method, so we do not look this up again
1325 if (is_osr_method()) {
1326 invalidate_osr_method();
1327 }
1328 // If _method is already NULL the Method* is about to be unloaded,
1329 // so we don't have to break the cycle. Note that it is possible to
1330 // have the Method* live here, in case we unload the nmethod because
1331 // it is pointing to some oop (other than the Method*) being unloaded.
1332 if (_method != NULL) {
1333 // OSR methods point to the Method*, but the Method* does not
1334 // point back!
1335 if (_method->code() == this) {
1336 _method->clear_code(); // Break a cycle
1337 }
1338 _method = NULL; // Clear the method of this dead nmethod
1339 }
1340
1341 // Make the class unloaded - i.e., change state and notify sweeper
1342 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
1343 if (is_in_use()) {
1344 // Transitioning directly from live to unloaded -- so
1345 // we need to force a cache clean-up; remember this
1346 // for later on.
1347 CodeCache::set_needs_cache_clean(true);
1348 }
1349
1350 // Unregister must be done before the state change
1351 Universe::heap()->unregister_nmethod(this);
1352
1353 #if INCLUDE_JVMCI
1354 // The method can only be unloaded after the pointer to the installed code
1355 // Java wrapper is no longer alive. Here we need to clear out this weak
1356 // reference to the dead object. Nulling out the reference has to happen
1357 // after the method is unregistered since the original value may be still
1358 // tracked by the rset.
1359 if (_jvmci_installed_code != NULL) {
1360 InstalledCode::set_address(_jvmci_installed_code, 0);
1361 _jvmci_installed_code = NULL;
1362 }
1363 #endif
1364
1365 _state = unloaded;
1366
1367 // Log the unloading.
1368 log_state_change();
1369
1370 // The Method* is gone at this point
1371 assert(_method == NULL, "Tautology");
1372
1373 set_osr_link(NULL);
1374 //set_scavenge_root_link(NULL); // done by prune_scavenge_root_nmethods
1375 NMethodSweeper::report_state_change(this);
1376 }
1377
1378 void nmethod::invalidate_osr_method() {
1379 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
1380 // Remove from list of active nmethods
1381 if (method() != NULL)
1382 method()->method_holder()->remove_osr_nmethod(this);
1383 }
1384
1385 void nmethod::log_state_change() const {
1386 if (LogCompilation) {
1387 if (xtty != NULL) {
1388 ttyLocker ttyl; // keep the following output all in one block
1389 if (_state == unloaded) {
1390 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'",
1391 os::current_thread_id());
1392 } else {
1393 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s",
1394 os::current_thread_id(),
1395 (_state == zombie ? " zombie='1'" : ""));
1396 }
1397 log_identity(xtty);
1398 xtty->stamp();
1399 xtty->end_elem();
1400 }
1401 }
1402 if (PrintCompilation && _state != unloaded) {
1403 print_on(tty, _state == zombie ? "made zombie" : "made not entrant");
1404 }
1405 }
1406
1407 /**
1408 * Common functionality for both make_not_entrant and make_zombie
1409 */
1410 bool nmethod::make_not_entrant_or_zombie(unsigned int state) {
1411 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant");
1412 assert(!is_zombie(), "should not already be a zombie");
1413
1414 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below.
1415 nmethodLocker nml(this);
1416 methodHandle the_method(method());
1417 No_Safepoint_Verifier nsv;
1418
1419 // during patching, depending on the nmethod state we must notify the GC that
1420 // code has been unloaded, unregistering it. We cannot do this right while
1421 // holding the Patching_lock because we need to use the CodeCache_lock. This
1422 // would be prone to deadlocks.
1423 // This flag is used to remember whether we need to later lock and unregister.
1424 bool nmethod_needs_unregister = false;
1425
1426 {
1427 // invalidate osr nmethod before acquiring the patching lock since
1428 // they both acquire leaf locks and we don't want a deadlock.
1429 // This logic is equivalent to the logic below for patching the
1430 // verified entry point of regular methods.
1431 if (is_osr_method()) {
1432 // this effectively makes the osr nmethod not entrant
1433 invalidate_osr_method();
1434 }
1435
1436 // Enter critical section. Does not block for safepoint.
1437 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1438
1439 if (_state == state) {
1440 // another thread already performed this transition so nothing
1441 // to do, but return false to indicate this.
1442 return false;
1443 }
1444
1445 // The caller can be calling the method statically or through an inline
1446 // cache call.
1447 if (!is_osr_method() && !is_not_entrant()) {
1448 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
1449 SharedRuntime::get_handle_wrong_method_stub());
1450 }
1451
1452 if (is_in_use()) {
1453 // It's a true state change, so mark the method as decompiled.
1454 // Do it only for transition from alive.
1455 inc_decompile_count();
1456 }
1457
1458 // If the state is becoming a zombie, signal to unregister the nmethod with
1459 // the heap.
1460 // This nmethod may have already been unloaded during a full GC.
1461 if ((state == zombie) && !is_unloaded()) {
1462 nmethod_needs_unregister = true;
1463 }
1464
1465 // Must happen before state change. Otherwise we have a race condition in
1466 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately
1467 // transition its state from 'not_entrant' to 'zombie' without having to wait
1468 // for stack scanning.
1469 if (state == not_entrant) {
1470 mark_as_seen_on_stack();
1471 OrderAccess::storestore();
1472 }
1473
1474 // Change state
1475 _state = state;
1476
1477 // Log the transition once
1478 log_state_change();
1479
1480 // Remove nmethod from method.
1481 // We need to check if both the _code and _from_compiled_code_entry_point
1482 // refer to this nmethod because there is a race in setting these two fields
1483 // in Method* as seen in bugid 4947125.
1484 // If the vep() points to the zombie nmethod, the memory for the nmethod
1485 // could be flushed and the compiler and vtable stubs could still call
1486 // through it.
1487 if (method() != NULL && (method()->code() == this ||
1488 method()->from_compiled_entry() == verified_entry_point())) {
1489 HandleMark hm;
1490 method()->clear_code();
1491 }
1492 } // leave critical region under Patching_lock
1493
1494 // When the nmethod becomes zombie it is no longer alive so the
1495 // dependencies must be flushed. nmethods in the not_entrant
1496 // state will be flushed later when the transition to zombie
1497 // happens or they get unloaded.
1498 if (state == zombie) {
1499 {
1500 // Flushing dependecies must be done before any possible
1501 // safepoint can sneak in, otherwise the oops used by the
1502 // dependency logic could have become stale.
1503 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1504 if (nmethod_needs_unregister) {
1505 Universe::heap()->unregister_nmethod(this);
1506 }
1507 flush_dependencies(NULL);
1508 }
1509
1510 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload
1511 // event and it hasn't already been reported for this nmethod then
1512 // report it now. The event may have been reported earilier if the GC
1513 // marked it for unloading). JvmtiDeferredEventQueue support means
1514 // we no longer go to a safepoint here.
1515 post_compiled_method_unload();
1516
1517 #ifdef ASSERT
1518 // It's no longer safe to access the oops section since zombie
1519 // nmethods aren't scanned for GC.
1520 _oops_are_stale = true;
1521 #endif
1522 // the Method may be reclaimed by class unloading now that the
1523 // nmethod is in zombie state
1524 set_method(NULL);
1525 } else {
1526 assert(state == not_entrant, "other cases may need to be handled differently");
1527 }
1528 #if INCLUDE_JVMCI
1529 if (_jvmci_installed_code != NULL) {
1530 // Break the link between nmethod and InstalledCode such that the nmethod can subsequently be flushed safely.
1531 InstalledCode::set_address(_jvmci_installed_code, 0);
1532 }
1533 #endif
1534
1535 if (TraceCreateZombies) {
1536 ResourceMark m;
1537 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");
1538 }
1539
1540 NMethodSweeper::report_state_change(this);
1541 return true;
1542 }
1543
1544 void nmethod::flush() {
1545 // Note that there are no valid oops in the nmethod anymore.
1546 assert(is_zombie() || (is_osr_method() && is_unloaded()), "must be a zombie method");
1547 assert(is_marked_for_reclamation() || (is_osr_method() && is_unloaded()), "must be marked for reclamation");
1548
1549 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed");
1550 assert_locked_or_safepoint(CodeCache_lock);
1551
1552 // completely deallocate this method
1553 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, p2i(this));
1554 if (PrintMethodFlushing) {
1555 tty->print_cr("*flushing nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT
1556 "/Free CodeCache:" SIZE_FORMAT "Kb",
1557 _compile_id, p2i(this), CodeCache::nof_blobs(),
1558 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024);
1559 }
1560
1561 // We need to deallocate any ExceptionCache data.
1562 // Note that we do not need to grab the nmethod lock for this, it
1563 // better be thread safe if we're disposing of it!
1564 ExceptionCache* ec = exception_cache();
1565 set_exception_cache(NULL);
1566 while(ec != NULL) {
1567 ExceptionCache* next = ec->next();
1568 delete ec;
1569 ec = next;
1570 }
1571
1572 if (on_scavenge_root_list()) {
1573 CodeCache::drop_scavenge_root_nmethod(this);
1574 }
1575
1576 #ifdef SHARK
1577 ((SharkCompiler *) compiler())->free_compiled_method(insts_begin());
1578 #endif // SHARK
1579
1580 ((CodeBlob*)(this))->flush();
1581
1582 CodeCache::free(this);
1583 }
1584
1585 //
1586 // Notify all classes this nmethod is dependent on that it is no
1587 // longer dependent. This should only be called in two situations.
1588 // First, when a nmethod transitions to a zombie all dependents need
1589 // to be clear. Since zombification happens at a safepoint there's no
1590 // synchronization issues. The second place is a little more tricky.
1591 // During phase 1 of mark sweep class unloading may happen and as a
1592 // result some nmethods may get unloaded. In this case the flushing
1593 // of dependencies must happen during phase 1 since after GC any
1594 // dependencies in the unloaded nmethod won't be updated, so
1595 // traversing the dependency information in unsafe. In that case this
1596 // function is called with a non-NULL argument and this function only
1597 // notifies instanceKlasses that are reachable
1598
1599 void nmethod::flush_dependencies(BoolObjectClosure* is_alive) {
1600 assert_locked_or_safepoint(CodeCache_lock);
1601 assert(Universe::heap()->is_gc_active() == (is_alive != NULL),
1602 "is_alive is non-NULL if and only if we are called during GC");
1603 if (!has_flushed_dependencies()) {
1604 set_has_flushed_dependencies();
1605 for (Dependencies::DepStream deps(this); deps.next(); ) {
1606 if (deps.type() == Dependencies::call_site_target_value) {
1607 // CallSite dependencies are managed on per-CallSite instance basis.
1608 oop call_site = deps.argument_oop(0);
1609 MethodHandles::remove_dependent_nmethod(call_site, this);
1610 } else {
1611 Klass* klass = deps.context_type();
1612 if (klass == NULL) {
1613 continue; // ignore things like evol_method
1614 }
1615 // During GC the is_alive closure is non-NULL, and is used to
1616 // determine liveness of dependees that need to be updated.
1617 if (is_alive == NULL || klass->is_loader_alive(is_alive)) {
1618 InstanceKlass::cast(klass)->remove_dependent_nmethod(this);
1619 }
1620 }
1621 }
1622 }
1623 }
1624
1625
1626 // If this oop is not live, the nmethod can be unloaded.
1627 bool nmethod::can_unload(BoolObjectClosure* is_alive, oop* root, bool unloading_occurred) {
1628 assert(root != NULL, "just checking");
1629 oop obj = *root;
1630 if (obj == NULL || is_alive->do_object_b(obj)) {
1631 return false;
1632 }
1633
1634 // If ScavengeRootsInCode is true, an nmethod might be unloaded
1635 // simply because one of its constant oops has gone dead.
1636 // No actual classes need to be unloaded in order for this to occur.
1637 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading");
1638 make_unloaded(is_alive, obj);
1639 return true;
1640 }
1641
1642 // ------------------------------------------------------------------
1643 // post_compiled_method_load_event
1644 // new method for install_code() path
1645 // Transfer information from compilation to jvmti
1646 void nmethod::post_compiled_method_load_event() {
1647
1648 Method* moop = method();
1649 HOTSPOT_COMPILED_METHOD_LOAD(
1650 (char *) moop->klass_name()->bytes(),
1651 moop->klass_name()->utf8_length(),
1652 (char *) moop->name()->bytes(),
1653 moop->name()->utf8_length(),
1654 (char *) moop->signature()->bytes(),
1655 moop->signature()->utf8_length(),
1656 insts_begin(), insts_size());
1657
1658 if (JvmtiExport::should_post_compiled_method_load() ||
1659 JvmtiExport::should_post_compiled_method_unload()) {
1660 get_and_cache_jmethod_id();
1661 }
1662
1663 if (JvmtiExport::should_post_compiled_method_load()) {
1664 // Let the Service thread (which is a real Java thread) post the event
1665 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1666 JvmtiDeferredEventQueue::enqueue(
1667 JvmtiDeferredEvent::compiled_method_load_event(this));
1668 }
1669 }
1670
1671 jmethodID nmethod::get_and_cache_jmethod_id() {
1672 if (_jmethod_id == NULL) {
1673 // Cache the jmethod_id since it can no longer be looked up once the
1674 // method itself has been marked for unloading.
1675 _jmethod_id = method()->jmethod_id();
1676 }
1677 return _jmethod_id;
1678 }
1679
1680 void nmethod::post_compiled_method_unload() {
1681 if (unload_reported()) {
1682 // During unloading we transition to unloaded and then to zombie
1683 // and the unloading is reported during the first transition.
1684 return;
1685 }
1686
1687 assert(_method != NULL && !is_unloaded(), "just checking");
1688 DTRACE_METHOD_UNLOAD_PROBE(method());
1689
1690 // If a JVMTI agent has enabled the CompiledMethodUnload event then
1691 // post the event. Sometime later this nmethod will be made a zombie
1692 // by the sweeper but the Method* will not be valid at that point.
1693 // If the _jmethod_id is null then no load event was ever requested
1694 // so don't bother posting the unload. The main reason for this is
1695 // that the jmethodID is a weak reference to the Method* so if
1696 // it's being unloaded there's no way to look it up since the weak
1697 // ref will have been cleared.
1698 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) {
1699 assert(!unload_reported(), "already unloaded");
1700 JvmtiDeferredEvent event =
1701 JvmtiDeferredEvent::compiled_method_unload_event(this,
1702 _jmethod_id, insts_begin());
1703 if (SafepointSynchronize::is_at_safepoint()) {
1704 // Don't want to take the queueing lock. Add it as pending and
1705 // it will get enqueued later.
1706 JvmtiDeferredEventQueue::add_pending_event(event);
1707 } else {
1708 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1709 JvmtiDeferredEventQueue::enqueue(event);
1710 }
1711 }
1712
1713 // The JVMTI CompiledMethodUnload event can be enabled or disabled at
1714 // any time. As the nmethod is being unloaded now we mark it has
1715 // having the unload event reported - this will ensure that we don't
1716 // attempt to report the event in the unlikely scenario where the
1717 // event is enabled at the time the nmethod is made a zombie.
1718 set_unload_reported();
1719 }
1720
1721 void static clean_ic_if_metadata_is_dead(CompiledIC *ic, BoolObjectClosure *is_alive) {
1722 if (ic->is_icholder_call()) {
1723 // The only exception is compiledICHolder oops which may
1724 // yet be marked below. (We check this further below).
1725 CompiledICHolder* cichk_oop = ic->cached_icholder();
1726
1727 if (cichk_oop->holder_method()->method_holder()->is_loader_alive(is_alive) &&
1728 cichk_oop->holder_klass()->is_loader_alive(is_alive)) {
1729 return;
1730 }
1731 } else {
1732 Metadata* ic_oop = ic->cached_metadata();
1733 if (ic_oop != NULL) {
1734 if (ic_oop->is_klass()) {
1735 if (((Klass*)ic_oop)->is_loader_alive(is_alive)) {
1736 return;
1737 }
1738 } else if (ic_oop->is_method()) {
1739 if (((Method*)ic_oop)->method_holder()->is_loader_alive(is_alive)) {
1740 return;
1741 }
1742 } else {
1743 ShouldNotReachHere();
1744 }
1745 }
1746 }
1747
1748 ic->set_to_clean();
1749 }
1750
1751 // This is called at the end of the strong tracing/marking phase of a
1752 // GC to unload an nmethod if it contains otherwise unreachable
1753 // oops.
1754
1755 void nmethod::do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred) {
1756 // Make sure the oop's ready to receive visitors
1757 assert(!is_zombie() && !is_unloaded(),
1758 "should not call follow on zombie or unloaded nmethod");
1759
1760 // If the method is not entrant then a JMP is plastered over the
1761 // first few bytes. If an oop in the old code was there, that oop
1762 // should not get GC'd. Skip the first few bytes of oops on
1763 // not-entrant methods.
1764 address low_boundary = verified_entry_point();
1765 if (is_not_entrant()) {
1766 low_boundary += NativeJump::instruction_size;
1767 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1768 // (See comment above.)
1769 }
1770
1771 // The RedefineClasses() API can cause the class unloading invariant
1772 // to no longer be true. See jvmtiExport.hpp for details.
1773 // Also, leave a debugging breadcrumb in local flag.
1774 if (JvmtiExport::has_redefined_a_class()) {
1775 // This set of the unloading_occurred flag is done before the
1776 // call to post_compiled_method_unload() so that the unloading
1777 // of this nmethod is reported.
1778 unloading_occurred = true;
1779 }
1780
1781 // Exception cache
1782 clean_exception_cache(is_alive);
1783
1784 // If class unloading occurred we first iterate over all inline caches and
1785 // clear ICs where the cached oop is referring to an unloaded klass or method.
1786 // The remaining live cached oops will be traversed in the relocInfo::oop_type
1787 // iteration below.
1788 if (unloading_occurred) {
1789 RelocIterator iter(this, low_boundary);
1790 while(iter.next()) {
1791 if (iter.type() == relocInfo::virtual_call_type) {
1792 CompiledIC *ic = CompiledIC_at(&iter);
1793 clean_ic_if_metadata_is_dead(ic, is_alive);
1794 }
1795 }
1796 }
1797
1798 // Compiled code
1799 {
1800 RelocIterator iter(this, low_boundary);
1801 while (iter.next()) {
1802 if (iter.type() == relocInfo::oop_type) {
1803 oop_Relocation* r = iter.oop_reloc();
1804 // In this loop, we must only traverse those oops directly embedded in
1805 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1806 assert(1 == (r->oop_is_immediate()) +
1807 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1808 "oop must be found in exactly one place");
1809 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1810 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) {
1811 return;
1812 }
1813 }
1814 }
1815 }
1816 }
1817
1818
1819 // Scopes
1820 for (oop* p = oops_begin(); p < oops_end(); p++) {
1821 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1822 if (can_unload(is_alive, p, unloading_occurred)) {
1823 return;
1824 }
1825 }
1826
1827 #if INCLUDE_JVMCI
1828 // Follow JVMCI method
1829 BarrierSet* bs = Universe::heap()->barrier_set();
1830 if (_jvmci_installed_code != NULL) {
1831 if (_jvmci_installed_code->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(_jvmci_installed_code)) {
1832 if (!is_alive->do_object_b(_jvmci_installed_code)) {
1833 bs->write_ref_nmethod_pre(&_jvmci_installed_code, this);
1834 _jvmci_installed_code = NULL;
1835 bs->write_ref_nmethod_post(&_jvmci_installed_code, this);
1836 }
1837 } else {
1838 if (can_unload(is_alive, (oop*)&_jvmci_installed_code, unloading_occurred)) {
1839 return;
1840 }
1841 }
1842 }
1843
1844 if (_speculation_log != NULL) {
1845 if (!is_alive->do_object_b(_speculation_log)) {
1846 bs->write_ref_nmethod_pre(&_speculation_log, this);
1847 _speculation_log = NULL;
1848 bs->write_ref_nmethod_post(&_speculation_log, this);
1849 }
1850 }
1851 #endif
1852
1853
1854 // Ensure that all metadata is still alive
1855 verify_metadata_loaders(low_boundary, is_alive);
1856 }
1857
1858 template <class CompiledICorStaticCall>
1859 static bool clean_if_nmethod_is_unloaded(CompiledICorStaticCall *ic, address addr, BoolObjectClosure *is_alive, nmethod* from) {
1860 // Ok, to lookup references to zombies here
1861 CodeBlob *cb = CodeCache::find_blob_unsafe(addr);
1862 if (cb != NULL && cb->is_nmethod()) {
1863 nmethod* nm = (nmethod*)cb;
1864
1865 if (nm->unloading_clock() != nmethod::global_unloading_clock()) {
1866 // The nmethod has not been processed yet.
1867 return true;
1868 }
1869
1870 // Clean inline caches pointing to both zombie and not_entrant methods
1871 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1872 ic->set_to_clean();
1873 assert(ic->is_clean(), "nmethod " PTR_FORMAT "not clean %s", p2i(from), from->method()->name_and_sig_as_C_string());
1874 }
1875 }
1876
1877 return false;
1878 }
1879
1880 static bool clean_if_nmethod_is_unloaded(CompiledIC *ic, BoolObjectClosure *is_alive, nmethod* from) {
1881 return clean_if_nmethod_is_unloaded(ic, ic->ic_destination(), is_alive, from);
1882 }
1883
1884 static bool clean_if_nmethod_is_unloaded(CompiledStaticCall *csc, BoolObjectClosure *is_alive, nmethod* from) {
1885 return clean_if_nmethod_is_unloaded(csc, csc->destination(), is_alive, from);
1886 }
1887
1888 bool nmethod::unload_if_dead_at(RelocIterator* iter_at_oop, BoolObjectClosure *is_alive, bool unloading_occurred) {
1889 assert(iter_at_oop->type() == relocInfo::oop_type, "Wrong relocation type");
1890
1891 oop_Relocation* r = iter_at_oop->oop_reloc();
1892 // Traverse those oops directly embedded in the code.
1893 // Other oops (oop_index>0) are seen as part of scopes_oops.
1894 assert(1 == (r->oop_is_immediate()) +
1895 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1896 "oop must be found in exactly one place");
1897 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1898 // Unload this nmethod if the oop is dead.
1899 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) {
1900 return true;;
1901 }
1902 }
1903
1904 return false;
1905 }
1906
1907
1908 bool nmethod::do_unloading_parallel(BoolObjectClosure* is_alive, bool unloading_occurred) {
1909 ResourceMark rm;
1910
1911 // Make sure the oop's ready to receive visitors
1912 assert(!is_zombie() && !is_unloaded(),
1913 "should not call follow on zombie or unloaded nmethod");
1914
1915 // If the method is not entrant then a JMP is plastered over the
1916 // first few bytes. If an oop in the old code was there, that oop
1917 // should not get GC'd. Skip the first few bytes of oops on
1918 // not-entrant methods.
1919 address low_boundary = verified_entry_point();
1920 if (is_not_entrant()) {
1921 low_boundary += NativeJump::instruction_size;
1922 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1923 // (See comment above.)
1924 }
1925
1926 // The RedefineClasses() API can cause the class unloading invariant
1927 // to no longer be true. See jvmtiExport.hpp for details.
1928 // Also, leave a debugging breadcrumb in local flag.
1929 if (JvmtiExport::has_redefined_a_class()) {
1930 // This set of the unloading_occurred flag is done before the
1931 // call to post_compiled_method_unload() so that the unloading
1932 // of this nmethod is reported.
1933 unloading_occurred = true;
1934 }
1935
1936 #if INCLUDE_JVMCI
1937 // Follow JVMCI method
1938 if (_jvmci_installed_code != NULL) {
1939 if (_jvmci_installed_code->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(_jvmci_installed_code)) {
1940 if (!is_alive->do_object_b(_jvmci_installed_code)) {
1941 _jvmci_installed_code = NULL;
1942 }
1943 } else {
1944 if (can_unload(is_alive, (oop*)&_jvmci_installed_code, unloading_occurred)) {
1945 return false;
1946 }
1947 }
1948 }
1949
1950 if (_speculation_log != NULL) {
1951 if (!is_alive->do_object_b(_speculation_log)) {
1952 _speculation_log = NULL;
1953 }
1954 }
1955 #endif
1956
1957 // Exception cache
1958 clean_exception_cache(is_alive);
1959
1960 bool is_unloaded = false;
1961 bool postponed = false;
1962
1963 RelocIterator iter(this, low_boundary);
1964 while(iter.next()) {
1965
1966 switch (iter.type()) {
1967
1968 case relocInfo::virtual_call_type:
1969 if (unloading_occurred) {
1970 // If class unloading occurred we first iterate over all inline caches and
1971 // clear ICs where the cached oop is referring to an unloaded klass or method.
1972 clean_ic_if_metadata_is_dead(CompiledIC_at(&iter), is_alive);
1973 }
1974
1975 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
1976 break;
1977
1978 case relocInfo::opt_virtual_call_type:
1979 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
1980 break;
1981
1982 case relocInfo::static_call_type:
1983 postponed |= clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this);
1984 break;
1985
1986 case relocInfo::oop_type:
1987 if (!is_unloaded) {
1988 is_unloaded = unload_if_dead_at(&iter, is_alive, unloading_occurred);
1989 }
1990 break;
1991
1992 case relocInfo::metadata_type:
1993 break; // nothing to do.
1994 }
1995 }
1996
1997 if (is_unloaded) {
1998 return postponed;
1999 }
2000
2001 // Scopes
2002 for (oop* p = oops_begin(); p < oops_end(); p++) {
2003 if (*p == Universe::non_oop_word()) continue; // skip non-oops
2004 if (can_unload(is_alive, p, unloading_occurred)) {
2005 is_unloaded = true;
2006 break;
2007 }
2008 }
2009
2010 if (is_unloaded) {
2011 return postponed;
2012 }
2013
2014 #if INCLUDE_JVMCI
2015 // Follow JVMCI method
2016 BarrierSet* bs = Universe::heap()->barrier_set();
2017 if (_jvmci_installed_code != NULL) {
2018 if (_jvmci_installed_code->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(_jvmci_installed_code)) {
2019 if (!is_alive->do_object_b(_jvmci_installed_code)) {
2020 bs->write_ref_nmethod_pre(&_jvmci_installed_code, this);
2021 _jvmci_installed_code = NULL;
2022 bs->write_ref_nmethod_post(&_jvmci_installed_code, this);
2023 }
2024 } else {
2025 if (can_unload(is_alive, (oop*)&_jvmci_installed_code, unloading_occurred)) {
2026 is_unloaded = true;
2027 }
2028 }
2029 }
2030
2031 if (_speculation_log != NULL) {
2032 if (!is_alive->do_object_b(_speculation_log)) {
2033 bs->write_ref_nmethod_pre(&_speculation_log, this);
2034 _speculation_log = NULL;
2035 bs->write_ref_nmethod_post(&_speculation_log, this);
2036 }
2037 }
2038 #endif
2039
2040 // Ensure that all metadata is still alive
2041 verify_metadata_loaders(low_boundary, is_alive);
2042
2043 return postponed;
2044 }
2045
2046 void nmethod::do_unloading_parallel_postponed(BoolObjectClosure* is_alive, bool unloading_occurred) {
2047 ResourceMark rm;
2048
2049 // Make sure the oop's ready to receive visitors
2050 assert(!is_zombie(),
2051 "should not call follow on zombie nmethod");
2052
2053 // If the method is not entrant then a JMP is plastered over the
2054 // first few bytes. If an oop in the old code was there, that oop
2055 // should not get GC'd. Skip the first few bytes of oops on
2056 // not-entrant methods.
2057 address low_boundary = verified_entry_point();
2058 if (is_not_entrant()) {
2059 low_boundary += NativeJump::instruction_size;
2060 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
2061 // (See comment above.)
2062 }
2063
2064 RelocIterator iter(this, low_boundary);
2065 while(iter.next()) {
2066
2067 switch (iter.type()) {
2068
2069 case relocInfo::virtual_call_type:
2070 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
2071 break;
2072
2073 case relocInfo::opt_virtual_call_type:
2074 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
2075 break;
2076
2077 case relocInfo::static_call_type:
2078 clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this);
2079 break;
2080 }
2081 }
2082 }
2083
2084 #ifdef ASSERT
2085
2086 class CheckClass : AllStatic {
2087 static BoolObjectClosure* _is_alive;
2088
2089 // Check class_loader is alive for this bit of metadata.
2090 static void check_class(Metadata* md) {
2091 Klass* klass = NULL;
2092 if (md->is_klass()) {
2093 klass = ((Klass*)md);
2094 } else if (md->is_method()) {
2095 klass = ((Method*)md)->method_holder();
2096 } else if (md->is_methodData()) {
2097 klass = ((MethodData*)md)->method()->method_holder();
2098 } else {
2099 md->print();
2100 ShouldNotReachHere();
2101 }
2102 assert(klass->is_loader_alive(_is_alive), "must be alive");
2103 }
2104 public:
2105 static void do_check_class(BoolObjectClosure* is_alive, nmethod* nm) {
2106 assert(SafepointSynchronize::is_at_safepoint(), "this is only ok at safepoint");
2107 _is_alive = is_alive;
2108 nm->metadata_do(check_class);
2109 }
2110 };
2111
2112 // This is called during a safepoint so can use static data
2113 BoolObjectClosure* CheckClass::_is_alive = NULL;
2114 #endif // ASSERT
2115
2116
2117 // Processing of oop references should have been sufficient to keep
2118 // all strong references alive. Any weak references should have been
2119 // cleared as well. Visit all the metadata and ensure that it's
2120 // really alive.
2121 void nmethod::verify_metadata_loaders(address low_boundary, BoolObjectClosure* is_alive) {
2122 #ifdef ASSERT
2123 RelocIterator iter(this, low_boundary);
2124 while (iter.next()) {
2125 // static_stub_Relocations may have dangling references to
2126 // Method*s so trim them out here. Otherwise it looks like
2127 // compiled code is maintaining a link to dead metadata.
2128 address static_call_addr = NULL;
2129 if (iter.type() == relocInfo::opt_virtual_call_type) {
2130 CompiledIC* cic = CompiledIC_at(&iter);
2131 if (!cic->is_call_to_interpreted()) {
2132 static_call_addr = iter.addr();
2133 }
2134 } else if (iter.type() == relocInfo::static_call_type) {
2135 CompiledStaticCall* csc = compiledStaticCall_at(iter.reloc());
2136 if (!csc->is_call_to_interpreted()) {
2137 static_call_addr = iter.addr();
2138 }
2139 }
2140 if (static_call_addr != NULL) {
2141 RelocIterator sciter(this, low_boundary);
2142 while (sciter.next()) {
2143 if (sciter.type() == relocInfo::static_stub_type &&
2144 sciter.static_stub_reloc()->static_call() == static_call_addr) {
2145 sciter.static_stub_reloc()->clear_inline_cache();
2146 }
2147 }
2148 }
2149 }
2150 // Check that the metadata embedded in the nmethod is alive
2151 CheckClass::do_check_class(is_alive, this);
2152 #endif
2153 }
2154
2155
2156 // Iterate over metadata calling this function. Used by RedefineClasses
2157 void nmethod::metadata_do(void f(Metadata*)) {
2158 address low_boundary = verified_entry_point();
2159 if (is_not_entrant()) {
2160 low_boundary += NativeJump::instruction_size;
2161 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
2162 // (See comment above.)
2163 }
2164 {
2165 // Visit all immediate references that are embedded in the instruction stream.
2166 RelocIterator iter(this, low_boundary);
2167 while (iter.next()) {
2168 if (iter.type() == relocInfo::metadata_type ) {
2169 metadata_Relocation* r = iter.metadata_reloc();
2170 // In this metadata, we must only follow those metadatas directly embedded in
2171 // the code. Other metadatas (oop_index>0) are seen as part of
2172 // the metadata section below.
2173 assert(1 == (r->metadata_is_immediate()) +
2174 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
2175 "metadata must be found in exactly one place");
2176 if (r->metadata_is_immediate() && r->metadata_value() != NULL) {
2177 Metadata* md = r->metadata_value();
2178 if (md != _method) f(md);
2179 }
2180 } else if (iter.type() == relocInfo::virtual_call_type) {
2181 // Check compiledIC holders associated with this nmethod
2182 CompiledIC *ic = CompiledIC_at(&iter);
2183 if (ic->is_icholder_call()) {
2184 CompiledICHolder* cichk = ic->cached_icholder();
2185 f(cichk->holder_method());
2186 f(cichk->holder_klass());
2187 } else {
2188 Metadata* ic_oop = ic->cached_metadata();
2189 if (ic_oop != NULL) {
2190 f(ic_oop);
2191 }
2192 }
2193 }
2194 }
2195 }
2196
2197 // Visit the metadata section
2198 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
2199 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops
2200 Metadata* md = *p;
2201 f(md);
2202 }
2203
2204 // Visit metadata not embedded in the other places.
2205 if (_method != NULL) f(_method);
2206 }
2207
2208 void nmethod::oops_do(OopClosure* f, bool allow_zombie) {
2209 // make sure the oops ready to receive visitors
2210 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod");
2211 assert(!is_unloaded(), "should not call follow on unloaded nmethod");
2212
2213 // If the method is not entrant or zombie then a JMP is plastered over the
2214 // first few bytes. If an oop in the old code was there, that oop
2215 // should not get GC'd. Skip the first few bytes of oops on
2216 // not-entrant methods.
2217 address low_boundary = verified_entry_point();
2218 if (is_not_entrant()) {
2219 low_boundary += NativeJump::instruction_size;
2220 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
2221 // (See comment above.)
2222 }
2223
2224 #if INCLUDE_JVMCI
2225 if (_jvmci_installed_code != NULL) {
2226 f->do_oop((oop*) &_jvmci_installed_code);
2227 }
2228 if (_speculation_log != NULL) {
2229 f->do_oop((oop*) &_speculation_log);
2230 }
2231 #endif
2232
2233 RelocIterator iter(this, low_boundary);
2234
2235 while (iter.next()) {
2236 if (iter.type() == relocInfo::oop_type ) {
2237 oop_Relocation* r = iter.oop_reloc();
2238 // In this loop, we must only follow those oops directly embedded in
2239 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
2240 assert(1 == (r->oop_is_immediate()) +
2241 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
2242 "oop must be found in exactly one place");
2243 if (r->oop_is_immediate() && r->oop_value() != NULL) {
2244 f->do_oop(r->oop_addr());
2245 }
2246 }
2247 }
2248
2249 // Scopes
2250 // This includes oop constants not inlined in the code stream.
2251 for (oop* p = oops_begin(); p < oops_end(); p++) {
2252 if (*p == Universe::non_oop_word()) continue; // skip non-oops
2253 f->do_oop(p);
2254 }
2255 }
2256
2257 #define NMETHOD_SENTINEL ((nmethod*)badAddress)
2258
2259 nmethod* volatile nmethod::_oops_do_mark_nmethods;
2260
2261 // An nmethod is "marked" if its _mark_link is set non-null.
2262 // Even if it is the end of the linked list, it will have a non-null link value,
2263 // as long as it is on the list.
2264 // This code must be MP safe, because it is used from parallel GC passes.
2265 bool nmethod::test_set_oops_do_mark() {
2266 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");
2267 nmethod* observed_mark_link = _oops_do_mark_link;
2268 if (observed_mark_link == NULL) {
2269 // Claim this nmethod for this thread to mark.
2270 observed_mark_link = (nmethod*)
2271 Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_link, NULL);
2272 if (observed_mark_link == NULL) {
2273
2274 // Atomically append this nmethod (now claimed) to the head of the list:
2275 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods;
2276 for (;;) {
2277 nmethod* required_mark_nmethods = observed_mark_nmethods;
2278 _oops_do_mark_link = required_mark_nmethods;
2279 observed_mark_nmethods = (nmethod*)
2280 Atomic::cmpxchg_ptr(this, &_oops_do_mark_nmethods, required_mark_nmethods);
2281 if (observed_mark_nmethods == required_mark_nmethods)
2282 break;
2283 }
2284 // Mark was clear when we first saw this guy.
2285 NOT_PRODUCT(if (TraceScavenge) print_on(tty, "oops_do, mark"));
2286 return false;
2287 }
2288 }
2289 // On fall through, another racing thread marked this nmethod before we did.
2290 return true;
2291 }
2292
2293 void nmethod::oops_do_marking_prologue() {
2294 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("[oops_do_marking_prologue"));
2295 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row");
2296 // We use cmpxchg_ptr instead of regular assignment here because the user
2297 // may fork a bunch of threads, and we need them all to see the same state.
2298 void* observed = Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, NULL);
2299 guarantee(observed == NULL, "no races in this sequential code");
2300 }
2301
2302 void nmethod::oops_do_marking_epilogue() {
2303 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row");
2304 nmethod* cur = _oops_do_mark_nmethods;
2305 while (cur != NMETHOD_SENTINEL) {
2306 assert(cur != NULL, "not NULL-terminated");
2307 nmethod* next = cur->_oops_do_mark_link;
2308 cur->_oops_do_mark_link = NULL;
2309 cur->verify_oop_relocations();
2310 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark"));
2311 cur = next;
2312 }
2313 void* required = _oops_do_mark_nmethods;
2314 void* observed = Atomic::cmpxchg_ptr(NULL, &_oops_do_mark_nmethods, required);
2315 guarantee(observed == required, "no races in this sequential code");
2316 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("oops_do_marking_epilogue]"));
2317 }
2318
2319 class DetectScavengeRoot: public OopClosure {
2320 bool _detected_scavenge_root;
2321 public:
2322 DetectScavengeRoot() : _detected_scavenge_root(false)
2323 { NOT_PRODUCT(_print_nm = NULL); }
2324 bool detected_scavenge_root() { return _detected_scavenge_root; }
2325 virtual void do_oop(oop* p) {
2326 if ((*p) != NULL && (*p)->is_scavengable()) {
2327 NOT_PRODUCT(maybe_print(p));
2328 _detected_scavenge_root = true;
2329 }
2330 }
2331 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2332
2333 #ifndef PRODUCT
2334 nmethod* _print_nm;
2335 void maybe_print(oop* p) {
2336 if (_print_nm == NULL) return;
2337 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root");
2338 tty->print_cr("" PTR_FORMAT "[offset=%d] detected scavengable oop " PTR_FORMAT " (found at " PTR_FORMAT ")",
2339 p2i(_print_nm), (int)((intptr_t)p - (intptr_t)_print_nm),
2340 p2i(*p), p2i(p));
2341 (*p)->print();
2342 }
2343 #endif //PRODUCT
2344 };
2345
2346 bool nmethod::detect_scavenge_root_oops() {
2347 DetectScavengeRoot detect_scavenge_root;
2348 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this);
2349 oops_do(&detect_scavenge_root);
2350 return detect_scavenge_root.detected_scavenge_root();
2351 }
2352
2353 // Method that knows how to preserve outgoing arguments at call. This method must be
2354 // called with a frame corresponding to a Java invoke
2355 void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) {
2356 #ifndef SHARK
2357 if (method() != NULL && !method()->is_native()) {
2358 SimpleScopeDesc ssd(this, fr.pc());
2359 Bytecode_invoke call(ssd.method(), ssd.bci());
2360 bool has_receiver = call.has_receiver();
2361 bool has_appendix = call.has_appendix();
2362 Symbol* signature = call.signature();
2363 fr.oops_compiled_arguments_do(signature, has_receiver, has_appendix, reg_map, f);
2364 }
2365 #endif // !SHARK
2366 }
2367
2368 inline bool includes(void* p, void* from, void* to) {
2369 return from <= p && p < to;
2370 }
2371
2372
2373 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
2374 assert(count >= 2, "must be sentinel values, at least");
2375
2376 #ifdef ASSERT
2377 // must be sorted and unique; we do a binary search in find_pc_desc()
2378 int prev_offset = pcs[0].pc_offset();
2379 assert(prev_offset == PcDesc::lower_offset_limit,
2380 "must start with a sentinel");
2381 for (int i = 1; i < count; i++) {
2382 int this_offset = pcs[i].pc_offset();
2383 assert(this_offset > prev_offset, "offsets must be sorted");
2384 prev_offset = this_offset;
2385 }
2386 assert(prev_offset == PcDesc::upper_offset_limit,
2387 "must end with a sentinel");
2388 #endif //ASSERT
2389
2390 // Search for MethodHandle invokes and tag the nmethod.
2391 for (int i = 0; i < count; i++) {
2392 if (pcs[i].is_method_handle_invoke()) {
2393 set_has_method_handle_invokes(true);
2394 break;
2395 }
2396 }
2397 assert(has_method_handle_invokes() == (_deoptimize_mh_offset != -1), "must have deopt mh handler");
2398
2399 int size = count * sizeof(PcDesc);
2400 assert(scopes_pcs_size() >= size, "oob");
2401 memcpy(scopes_pcs_begin(), pcs, size);
2402
2403 // Adjust the final sentinel downward.
2404 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
2405 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
2406 last_pc->set_pc_offset(content_size() + 1);
2407 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
2408 // Fill any rounding gaps with copies of the last record.
2409 last_pc[1] = last_pc[0];
2410 }
2411 // The following assert could fail if sizeof(PcDesc) is not
2412 // an integral multiple of oopSize (the rounding term).
2413 // If it fails, change the logic to always allocate a multiple
2414 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
2415 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
2416 }
2417
2418 void nmethod::copy_scopes_data(u_char* buffer, int size) {
2419 assert(scopes_data_size() >= size, "oob");
2420 memcpy(scopes_data_begin(), buffer, size);
2421 }
2422
2423 // When using JVMCI the address might be off by the size of a call instruction.
2424 bool nmethod::is_deopt_entry(address pc) {
2425 return pc == deopt_handler_begin()
2426 #if INCLUDE_JVMCI
2427 || pc == (deopt_handler_begin() + NativeCall::instruction_size)
2428 #endif
2429 ;
2430 }
2431
2432 #ifdef ASSERT
2433 static PcDesc* linear_search(nmethod* nm, int pc_offset, bool approximate) {
2434 PcDesc* lower = nm->scopes_pcs_begin();
2435 PcDesc* upper = nm->scopes_pcs_end();
2436 lower += 1; // exclude initial sentinel
2437 PcDesc* res = NULL;
2438 for (PcDesc* p = lower; p < upper; p++) {
2439 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc
2440 if (match_desc(p, pc_offset, approximate)) {
2441 if (res == NULL)
2442 res = p;
2443 else
2444 res = (PcDesc*) badAddress;
2445 }
2446 }
2447 return res;
2448 }
2449 #endif
2450
2451
2452 // Finds a PcDesc with real-pc equal to "pc"
2453 PcDesc* nmethod::find_pc_desc_internal(address pc, bool approximate) {
2454 address base_address = code_begin();
2455 if ((pc < base_address) ||
2456 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
2457 return NULL; // PC is wildly out of range
2458 }
2459 int pc_offset = (int) (pc - base_address);
2460
2461 // Check the PcDesc cache if it contains the desired PcDesc
2462 // (This as an almost 100% hit rate.)
2463 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
2464 if (res != NULL) {
2465 assert(res == linear_search(this, pc_offset, approximate), "cache ok");
2466 return res;
2467 }
2468
2469 // Fallback algorithm: quasi-linear search for the PcDesc
2470 // Find the last pc_offset less than the given offset.
2471 // The successor must be the required match, if there is a match at all.
2472 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
2473 PcDesc* lower = scopes_pcs_begin();
2474 PcDesc* upper = scopes_pcs_end();
2475 upper -= 1; // exclude final sentinel
2476 if (lower >= upper) return NULL; // native method; no PcDescs at all
2477
2478 #define assert_LU_OK \
2479 /* invariant on lower..upper during the following search: */ \
2480 assert(lower->pc_offset() < pc_offset, "sanity"); \
2481 assert(upper->pc_offset() >= pc_offset, "sanity")
2482 assert_LU_OK;
2483
2484 // Use the last successful return as a split point.
2485 PcDesc* mid = _pc_desc_cache.last_pc_desc();
2486 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
2487 if (mid->pc_offset() < pc_offset) {
2488 lower = mid;
2489 } else {
2490 upper = mid;
2491 }
2492
2493 // Take giant steps at first (4096, then 256, then 16, then 1)
2494 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
2495 const int RADIX = (1 << LOG2_RADIX);
2496 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
2497 while ((mid = lower + step) < upper) {
2498 assert_LU_OK;
2499 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
2500 if (mid->pc_offset() < pc_offset) {
2501 lower = mid;
2502 } else {
2503 upper = mid;
2504 break;
2505 }
2506 }
2507 assert_LU_OK;
2508 }
2509
2510 // Sneak up on the value with a linear search of length ~16.
2511 while (true) {
2512 assert_LU_OK;
2513 mid = lower + 1;
2514 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
2515 if (mid->pc_offset() < pc_offset) {
2516 lower = mid;
2517 } else {
2518 upper = mid;
2519 break;
2520 }
2521 }
2522 #undef assert_LU_OK
2523
2524 if (match_desc(upper, pc_offset, approximate)) {
2525 assert(upper == linear_search(this, pc_offset, approximate), "search ok");
2526 _pc_desc_cache.add_pc_desc(upper);
2527 return upper;
2528 } else {
2529 assert(NULL == linear_search(this, pc_offset, approximate), "search ok");
2530 return NULL;
2531 }
2532 }
2533
2534
2535 void nmethod::check_all_dependencies(DepChange& changes) {
2536 // Checked dependencies are allocated into this ResourceMark
2537 ResourceMark rm;
2538
2539 // Turn off dependency tracing while actually testing dependencies.
2540 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) );
2541
2542 typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash,
2543 &DependencySignature::equals, 11027> DepTable;
2544
2545 DepTable* table = new DepTable();
2546
2547 // Iterate over live nmethods and check dependencies of all nmethods that are not
2548 // marked for deoptimization. A particular dependency is only checked once.
2549 NMethodIterator iter;
2550 while(iter.next()) {
2551 nmethod* nm = iter.method();
2552 // Only notify for live nmethods
2553 if (nm->is_alive() && !nm->is_marked_for_deoptimization()) {
2554 for (Dependencies::DepStream deps(nm); deps.next(); ) {
2555 // Construct abstraction of a dependency.
2556 DependencySignature* current_sig = new DependencySignature(deps);
2557
2558 // Determine if dependency is already checked. table->put(...) returns
2559 // 'true' if the dependency is added (i.e., was not in the hashtable).
2560 if (table->put(*current_sig, 1)) {
2561 if (deps.check_dependency() != NULL) {
2562 // Dependency checking failed. Print out information about the failed
2563 // dependency and finally fail with an assert. We can fail here, since
2564 // dependency checking is never done in a product build.
2565 tty->print_cr("Failed dependency:");
2566 changes.print();
2567 nm->print();
2568 nm->print_dependencies();
2569 assert(false, "Should have been marked for deoptimization");
2570 }
2571 }
2572 }
2573 }
2574 }
2575 }
2576
2577 bool nmethod::check_dependency_on(DepChange& changes) {
2578 // What has happened:
2579 // 1) a new class dependee has been added
2580 // 2) dependee and all its super classes have been marked
2581 bool found_check = false; // set true if we are upset
2582 for (Dependencies::DepStream deps(this); deps.next(); ) {
2583 // Evaluate only relevant dependencies.
2584 if (deps.spot_check_dependency_at(changes) != NULL) {
2585 found_check = true;
2586 NOT_DEBUG(break);
2587 }
2588 }
2589 return found_check;
2590 }
2591
2592 bool nmethod::is_evol_dependent_on(Klass* dependee) {
2593 InstanceKlass *dependee_ik = InstanceKlass::cast(dependee);
2594 Array<Method*>* dependee_methods = dependee_ik->methods();
2595 for (Dependencies::DepStream deps(this); deps.next(); ) {
2596 if (deps.type() == Dependencies::evol_method) {
2597 Method* method = deps.method_argument(0);
2598 for (int j = 0; j < dependee_methods->length(); j++) {
2599 if (dependee_methods->at(j) == method) {
2600 // RC_TRACE macro has an embedded ResourceMark
2601 RC_TRACE(0x01000000,
2602 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)",
2603 _method->method_holder()->external_name(),
2604 _method->name()->as_C_string(),
2605 _method->signature()->as_C_string(), compile_id(),
2606 method->method_holder()->external_name(),
2607 method->name()->as_C_string(),
2608 method->signature()->as_C_string()));
2609 if (TraceDependencies || LogCompilation)
2610 deps.log_dependency(dependee);
2611 return true;
2612 }
2613 }
2614 }
2615 }
2616 return false;
2617 }
2618
2619 // Called from mark_for_deoptimization, when dependee is invalidated.
2620 bool nmethod::is_dependent_on_method(Method* dependee) {
2621 for (Dependencies::DepStream deps(this); deps.next(); ) {
2622 if (deps.type() != Dependencies::evol_method)
2623 continue;
2624 Method* method = deps.method_argument(0);
2625 if (method == dependee) return true;
2626 }
2627 return false;
2628 }
2629
2630
2631 bool nmethod::is_patchable_at(address instr_addr) {
2632 assert(insts_contains(instr_addr), "wrong nmethod used");
2633 if (is_zombie()) {
2634 // a zombie may never be patched
2635 return false;
2636 }
2637 return true;
2638 }
2639
2640
2641 address nmethod::continuation_for_implicit_exception(address pc) {
2642 // Exception happened outside inline-cache check code => we are inside
2643 // an active nmethod => use cpc to determine a return address
2644 int exception_offset = pc - code_begin();
2645 int cont_offset = ImplicitExceptionTable(this).at( exception_offset );
2646 #ifdef ASSERT
2647 if (cont_offset == 0) {
2648 Thread* thread = ThreadLocalStorage::get_thread_slow();
2649 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
2650 HandleMark hm(thread);
2651 ResourceMark rm(thread);
2652 CodeBlob* cb = CodeCache::find_blob(pc);
2653 assert(cb != NULL && cb == this, "");
2654 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, p2i(pc));
2655 print();
2656 method()->print_codes();
2657 print_code();
2658 print_pcs();
2659 }
2660 #endif
2661 if (cont_offset == 0) {
2662 // Let the normal error handling report the exception
2663 return NULL;
2664 }
2665 return code_begin() + cont_offset;
2666 }
2667
2668
2669
2670 void nmethod_init() {
2671 // make sure you didn't forget to adjust the filler fields
2672 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
2673 }
2674
2675
2676 //-------------------------------------------------------------------------------------------
2677
2678
2679 // QQQ might we make this work from a frame??
2680 nmethodLocker::nmethodLocker(address pc) {
2681 CodeBlob* cb = CodeCache::find_blob(pc);
2682 guarantee(cb != NULL && cb->is_nmethod(), "bad pc for a nmethod found");
2683 _nm = (nmethod*)cb;
2684 lock_nmethod(_nm);
2685 }
2686
2687 // Only JvmtiDeferredEvent::compiled_method_unload_event()
2688 // should pass zombie_ok == true.
2689 void nmethodLocker::lock_nmethod(nmethod* nm, bool zombie_ok) {
2690 if (nm == NULL) return;
2691 Atomic::inc(&nm->_lock_count);
2692 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method");
2693 }
2694
2695 void nmethodLocker::unlock_nmethod(nmethod* nm) {
2696 if (nm == NULL) return;
2697 Atomic::dec(&nm->_lock_count);
2698 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock");
2699 }
2700
2701 // -----------------------------------------------------------------------------
2702 // nmethod::get_deopt_original_pc
2703 //
2704 // Return the original PC for the given PC if:
2705 // (a) the given PC belongs to a nmethod and
2706 // (b) it is a deopt PC
2707 address nmethod::get_deopt_original_pc(const frame* fr) {
2708 if (fr->cb() == NULL) return NULL;
2709
2710 nmethod* nm = fr->cb()->as_nmethod_or_null();
2711 if (nm != NULL && nm->is_deopt_pc(fr->pc()))
2712 return nm->get_original_pc(fr);
2713
2714 return NULL;
2715 }
2716
2717
2718 // -----------------------------------------------------------------------------
2719 // MethodHandle
2720
2721 bool nmethod::is_method_handle_return(address return_pc) {
2722 if (!has_method_handle_invokes()) return false;
2723 PcDesc* pd = pc_desc_at(return_pc);
2724 if (pd == NULL)
2725 return false;
2726 return pd->is_method_handle_invoke();
2727 }
2728
2729
2730 // -----------------------------------------------------------------------------
2731 // Verification
2732
2733 class VerifyOopsClosure: public OopClosure {
2734 nmethod* _nm;
2735 bool _ok;
2736 public:
2737 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
2738 bool ok() { return _ok; }
2739 virtual void do_oop(oop* p) {
2740 if ((*p) == NULL || (*p)->is_oop()) return;
2741 if (_ok) {
2742 _nm->print_nmethod(true);
2743 _ok = false;
2744 }
2745 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2746 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2747 }
2748 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2749 };
2750
2751 void nmethod::verify() {
2752
2753 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant
2754 // seems odd.
2755
2756 if (is_zombie() || is_not_entrant() || is_unloaded())
2757 return;
2758
2759 // Make sure all the entry points are correctly aligned for patching.
2760 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
2761
2762 // assert(method()->is_oop(), "must be valid");
2763
2764 ResourceMark rm;
2765
2766 if (!CodeCache::contains(this)) {
2767 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this));
2768 }
2769
2770 if(is_native_method() )
2771 return;
2772
2773 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
2774 if (nm != this) {
2775 fatal("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this));
2776 }
2777
2778 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2779 if (! p->verify(this)) {
2780 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this));
2781 }
2782 }
2783
2784 VerifyOopsClosure voc(this);
2785 oops_do(&voc);
2786 assert(voc.ok(), "embedded oops must be OK");
2787 verify_scavenge_root_oops();
2788
2789 verify_scopes();
2790 }
2791
2792
2793 void nmethod::verify_interrupt_point(address call_site) {
2794 // Verify IC only when nmethod installation is finished.
2795 bool is_installed = (method()->code() == this) // nmethod is in state 'in_use' and installed
2796 || !this->is_in_use(); // nmethod is installed, but not in 'in_use' state
2797 if (is_installed) {
2798 Thread *cur = Thread::current();
2799 if (CompiledIC_lock->owner() == cur ||
2800 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) &&
2801 SafepointSynchronize::is_at_safepoint())) {
2802 CompiledIC_at(this, call_site);
2803 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
2804 } else {
2805 MutexLocker ml_verify (CompiledIC_lock);
2806 CompiledIC_at(this, call_site);
2807 }
2808 }
2809
2810 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address());
2811 assert(pd != NULL, "PcDesc must exist");
2812 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(),
2813 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(),
2814 pd->return_oop());
2815 !sd->is_top(); sd = sd->sender()) {
2816 sd->verify();
2817 }
2818 }
2819
2820 void nmethod::verify_scopes() {
2821 if( !method() ) return; // Runtime stubs have no scope
2822 if (method()->is_native()) return; // Ignore stub methods.
2823 // iterate through all interrupt point
2824 // and verify the debug information is valid.
2825 RelocIterator iter((nmethod*)this);
2826 while (iter.next()) {
2827 address stub = NULL;
2828 switch (iter.type()) {
2829 case relocInfo::virtual_call_type:
2830 verify_interrupt_point(iter.addr());
2831 break;
2832 case relocInfo::opt_virtual_call_type:
2833 stub = iter.opt_virtual_call_reloc()->static_stub();
2834 verify_interrupt_point(iter.addr());
2835 break;
2836 case relocInfo::static_call_type:
2837 stub = iter.static_call_reloc()->static_stub();
2838 //verify_interrupt_point(iter.addr());
2839 break;
2840 case relocInfo::runtime_call_type:
2841 address destination = iter.reloc()->value();
2842 // Right now there is no way to find out which entries support
2843 // an interrupt point. It would be nice if we had this
2844 // information in a table.
2845 break;
2846 }
2847 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section");
2848 }
2849 }
2850
2851
2852 // -----------------------------------------------------------------------------
2853 // Non-product code
2854 #ifndef PRODUCT
2855
2856 class DebugScavengeRoot: public OopClosure {
2857 nmethod* _nm;
2858 bool _ok;
2859 public:
2860 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { }
2861 bool ok() { return _ok; }
2862 virtual void do_oop(oop* p) {
2863 if ((*p) == NULL || !(*p)->is_scavengable()) return;
2864 if (_ok) {
2865 _nm->print_nmethod(true);
2866 _ok = false;
2867 }
2868 tty->print_cr("*** scavengable oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2869 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2870 (*p)->print();
2871 }
2872 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2873 };
2874
2875 void nmethod::verify_scavenge_root_oops() {
2876 if (UseG1GC) {
2877 return;
2878 }
2879
2880 if (!on_scavenge_root_list()) {
2881 // Actually look inside, to verify the claim that it's clean.
2882 DebugScavengeRoot debug_scavenge_root(this);
2883 oops_do(&debug_scavenge_root);
2884 if (!debug_scavenge_root.ok())
2885 fatal("found an unadvertised bad scavengable oop in the code cache");
2886 }
2887 assert(scavenge_root_not_marked(), "");
2888 }
2889
2890 #endif // PRODUCT
2891
2892 // Printing operations
2893
2894 void nmethod::print() const {
2895 ResourceMark rm;
2896 ttyLocker ttyl; // keep the following output all in one block
2897
2898 tty->print("Compiled method ");
2899
2900 if (is_compiled_by_c1()) {
2901 tty->print("(c1) ");
2902 } else if (is_compiled_by_c2()) {
2903 tty->print("(c2) ");
2904 } else if (is_compiled_by_shark()) {
2905 tty->print("(shark) ");
2906 } else if (is_compiled_by_jvmci()) {
2907 tty->print("(JVMCI) ");
2908 } else {
2909 tty->print("(nm) ");
2910 }
2911
2912 print_on(tty, NULL);
2913
2914 if (WizardMode) {
2915 tty->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this));
2916 tty->print(" for method " INTPTR_FORMAT , p2i(method()));
2917 tty->print(" { ");
2918 if (is_in_use()) tty->print("in_use ");
2919 if (is_not_entrant()) tty->print("not_entrant ");
2920 if (is_zombie()) tty->print("zombie ");
2921 if (is_unloaded()) tty->print("unloaded ");
2922 if (on_scavenge_root_list()) tty->print("scavenge_root ");
2923 tty->print_cr("}:");
2924 }
2925 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2926 p2i(this),
2927 p2i(this) + size(),
2928 size());
2929 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2930 p2i(relocation_begin()),
2931 p2i(relocation_end()),
2932 relocation_size());
2933 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2934 p2i(consts_begin()),
2935 p2i(consts_end()),
2936 consts_size());
2937 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2938 p2i(insts_begin()),
2939 p2i(insts_end()),
2940 insts_size());
2941 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2942 p2i(stub_begin()),
2943 p2i(stub_end()),
2944 stub_size());
2945 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2946 p2i(oops_begin()),
2947 p2i(oops_end()),
2948 oops_size());
2949 if (metadata_size () > 0) tty->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2950 p2i(metadata_begin()),
2951 p2i(metadata_end()),
2952 metadata_size());
2953 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2954 p2i(scopes_data_begin()),
2955 p2i(scopes_data_end()),
2956 scopes_data_size());
2957 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2958 p2i(scopes_pcs_begin()),
2959 p2i(scopes_pcs_end()),
2960 scopes_pcs_size());
2961 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2962 p2i(dependencies_begin()),
2963 p2i(dependencies_end()),
2964 dependencies_size());
2965 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2966 p2i(handler_table_begin()),
2967 p2i(handler_table_end()),
2968 handler_table_size());
2969 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2970 p2i(nul_chk_table_begin()),
2971 p2i(nul_chk_table_end()),
2972 nul_chk_table_size());
2973 }
2974
2975 void nmethod::print_code() {
2976 HandleMark hm;
2977 ResourceMark m;
2978 Disassembler::decode(this);
2979 }
2980
2981
2982 #ifndef PRODUCT
2983
2984 void nmethod::print_scopes() {
2985 // Find the first pc desc for all scopes in the code and print it.
2986 ResourceMark rm;
2987 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2988 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
2989 continue;
2990
2991 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
2992 while (sd != NULL) {
2993 sd->print_on(tty, p);
2994 sd = sd->sender();
2995 }
2996 }
2997 }
2998
2999 void nmethod::print_dependencies() {
3000 ResourceMark rm;
3001 ttyLocker ttyl; // keep the following output all in one block
3002 tty->print_cr("Dependencies:");
3003 for (Dependencies::DepStream deps(this); deps.next(); ) {
3004 deps.print_dependency();
3005 Klass* ctxk = deps.context_type();
3006 if (ctxk != NULL) {
3007 if (ctxk->oop_is_instance() && ((InstanceKlass*)ctxk)->is_dependent_nmethod(this)) {
3008 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name());
3009 }
3010 }
3011 deps.log_dependency(); // put it into the xml log also
3012 }
3013 }
3014
3015
3016 void nmethod::print_relocations() {
3017 ResourceMark m; // in case methods get printed via the debugger
3018 tty->print_cr("relocations:");
3019 RelocIterator iter(this);
3020 iter.print();
3021 if (UseRelocIndex) {
3022 jint* index_end = (jint*)relocation_end() - 1;
3023 jint index_size = *index_end;
3024 jint* index_start = (jint*)( (address)index_end - index_size );
3025 tty->print_cr(" index @" INTPTR_FORMAT ": index_size=%d", p2i(index_start), index_size);
3026 if (index_size > 0) {
3027 jint* ip;
3028 for (ip = index_start; ip+2 <= index_end; ip += 2)
3029 tty->print_cr(" (%d %d) addr=" INTPTR_FORMAT " @" INTPTR_FORMAT,
3030 ip[0],
3031 ip[1],
3032 p2i(header_end()+ip[0]),
3033 p2i(relocation_begin()-1+ip[1]));
3034 for (; ip < index_end; ip++)
3035 tty->print_cr(" (%d ?)", ip[0]);
3036 tty->print_cr(" @" INTPTR_FORMAT ": index_size=%d", p2i(ip), *ip);
3037 ip++;
3038 tty->print_cr("reloc_end @" INTPTR_FORMAT ":", p2i(ip));
3039 }
3040 }
3041 }
3042
3043
3044 void nmethod::print_pcs() {
3045 ResourceMark m; // in case methods get printed via debugger
3046 tty->print_cr("pc-bytecode offsets:");
3047 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
3048 p->print(this);
3049 }
3050 }
3051
3052 #endif // PRODUCT
3053
3054 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
3055 RelocIterator iter(this, begin, end);
3056 bool have_one = false;
3057 while (iter.next()) {
3058 have_one = true;
3059 switch (iter.type()) {
3060 case relocInfo::none: return "no_reloc";
3061 case relocInfo::oop_type: {
3062 stringStream st;
3063 oop_Relocation* r = iter.oop_reloc();
3064 oop obj = r->oop_value();
3065 st.print("oop(");
3066 if (obj == NULL) st.print("NULL");
3067 else obj->print_value_on(&st);
3068 st.print(")");
3069 return st.as_string();
3070 }
3071 case relocInfo::metadata_type: {
3072 stringStream st;
3073 metadata_Relocation* r = iter.metadata_reloc();
3074 Metadata* obj = r->metadata_value();
3075 st.print("metadata(");
3076 if (obj == NULL) st.print("NULL");
3077 else obj->print_value_on(&st);
3078 st.print(")");
3079 return st.as_string();
3080 }
3081 case relocInfo::runtime_call_type: {
3082 stringStream st;
3083 st.print("runtime_call");
3084 runtime_call_Relocation* r = iter.runtime_call_reloc();
3085 address dest = r->destination();
3086 CodeBlob* cb = CodeCache::find_blob(dest);
3087 if (cb != NULL) {
3088 st.print(" %s", cb->name());
3089 }
3090 return st.as_string();
3091 }
3092 case relocInfo::virtual_call_type: return "virtual_call";
3093 case relocInfo::opt_virtual_call_type: return "optimized virtual_call";
3094 case relocInfo::static_call_type: return "static_call";
3095 case relocInfo::static_stub_type: return "static_stub";
3096 case relocInfo::external_word_type: return "external_word";
3097 case relocInfo::internal_word_type: return "internal_word";
3098 case relocInfo::section_word_type: return "section_word";
3099 case relocInfo::poll_type: return "poll";
3100 case relocInfo::poll_return_type: return "poll_return";
3101 case relocInfo::type_mask: return "type_bit_mask";
3102 }
3103 }
3104 return have_one ? "other" : NULL;
3105 }
3106
3107 // Return a the last scope in (begin..end]
3108 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
3109 PcDesc* p = pc_desc_near(begin+1);
3110 if (p != NULL && p->real_pc(this) <= end) {
3111 return new ScopeDesc(this, p->scope_decode_offset(),
3112 p->obj_decode_offset(), p->should_reexecute(), p->rethrow_exception(),
3113 p->return_oop());
3114 }
3115 return NULL;
3116 }
3117
3118 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const {
3119 if (block_begin == entry_point()) stream->print_cr("[Entry Point]");
3120 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]");
3121 if (JVMCI_ONLY(_exception_offset >= 0 &&) block_begin == exception_begin()) stream->print_cr("[Exception Handler]");
3122 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]");
3123 if (JVMCI_ONLY(_deoptimize_offset >= 0 &&) block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]");
3124
3125 if (has_method_handle_invokes())
3126 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]");
3127
3128 if (block_begin == consts_begin()) stream->print_cr("[Constants]");
3129
3130 if (block_begin == entry_point()) {
3131 methodHandle m = method();
3132 if (m.not_null()) {
3133 stream->print(" # ");
3134 m->print_value_on(stream);
3135 stream->cr();
3136 }
3137 if (m.not_null() && !is_osr_method()) {
3138 ResourceMark rm;
3139 int sizeargs = m->size_of_parameters();
3140 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
3141 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
3142 {
3143 int sig_index = 0;
3144 if (!m->is_static())
3145 sig_bt[sig_index++] = T_OBJECT; // 'this'
3146 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) {
3147 BasicType t = ss.type();
3148 sig_bt[sig_index++] = t;
3149 if (type2size[t] == 2) {
3150 sig_bt[sig_index++] = T_VOID;
3151 } else {
3152 assert(type2size[t] == 1, "size is 1 or 2");
3153 }
3154 }
3155 assert(sig_index == sizeargs, "");
3156 }
3157 const char* spname = "sp"; // make arch-specific?
3158 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false);
3159 int stack_slot_offset = this->frame_size() * wordSize;
3160 int tab1 = 14, tab2 = 24;
3161 int sig_index = 0;
3162 int arg_index = (m->is_static() ? 0 : -1);
3163 bool did_old_sp = false;
3164 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) {
3165 bool at_this = (arg_index == -1);
3166 bool at_old_sp = false;
3167 BasicType t = (at_this ? T_OBJECT : ss.type());
3168 assert(t == sig_bt[sig_index], "sigs in sync");
3169 if (at_this)
3170 stream->print(" # this: ");
3171 else
3172 stream->print(" # parm%d: ", arg_index);
3173 stream->move_to(tab1);
3174 VMReg fst = regs[sig_index].first();
3175 VMReg snd = regs[sig_index].second();
3176 if (fst->is_reg()) {
3177 stream->print("%s", fst->name());
3178 if (snd->is_valid()) {
3179 stream->print(":%s", snd->name());
3180 }
3181 } else if (fst->is_stack()) {
3182 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
3183 if (offset == stack_slot_offset) at_old_sp = true;
3184 stream->print("[%s+0x%x]", spname, offset);
3185 } else {
3186 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
3187 }
3188 stream->print(" ");
3189 stream->move_to(tab2);
3190 stream->print("= ");
3191 if (at_this) {
3192 m->method_holder()->print_value_on(stream);
3193 } else {
3194 bool did_name = false;
3195 if (!at_this && ss.is_object()) {
3196 Symbol* name = ss.as_symbol_or_null();
3197 if (name != NULL) {
3198 name->print_value_on(stream);
3199 did_name = true;
3200 }
3201 }
3202 if (!did_name)
3203 stream->print("%s", type2name(t));
3204 }
3205 if (at_old_sp) {
3206 stream->print(" (%s of caller)", spname);
3207 did_old_sp = true;
3208 }
3209 stream->cr();
3210 sig_index += type2size[t];
3211 arg_index += 1;
3212 if (!at_this) ss.next();
3213 }
3214 if (!did_old_sp) {
3215 stream->print(" # ");
3216 stream->move_to(tab1);
3217 stream->print("[%s+0x%x]", spname, stack_slot_offset);
3218 stream->print(" (%s of caller)", spname);
3219 stream->cr();
3220 }
3221 }
3222 }
3223 }
3224
3225 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) {
3226 // First, find an oopmap in (begin, end].
3227 // We use the odd half-closed interval so that oop maps and scope descs
3228 // which are tied to the byte after a call are printed with the call itself.
3229 address base = code_begin();
3230 ImmutableOopMapSet* oms = oop_maps();
3231 if (oms != NULL) {
3232 for (int i = 0, imax = oms->count(); i < imax; i++) {
3233 const ImmutableOopMapPair* pair = oms->pair_at(i);
3234 const ImmutableOopMap* om = pair->get_from(oms);
3235 address pc = base + pair->pc_offset();
3236 if (pc > begin) {
3237 if (pc <= end) {
3238 st->move_to(column);
3239 st->print("; ");
3240 om->print_on(st);
3241 }
3242 break;
3243 }
3244 }
3245 }
3246
3247 // Print any debug info present at this pc.
3248 ScopeDesc* sd = scope_desc_in(begin, end);
3249 if (sd != NULL) {
3250 st->move_to(column);
3251 if (sd->bci() == SynchronizationEntryBCI) {
3252 st->print(";*synchronization entry");
3253 } else {
3254 if (sd->method() == NULL) {
3255 st->print("method is NULL");
3256 } else if (sd->method()->is_native()) {
3257 st->print("method is native");
3258 } else {
3259 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci());
3260 st->print(";*%s", Bytecodes::name(bc));
3261 switch (bc) {
3262 case Bytecodes::_invokevirtual:
3263 case Bytecodes::_invokespecial:
3264 case Bytecodes::_invokestatic:
3265 case Bytecodes::_invokeinterface:
3266 {
3267 Bytecode_invoke invoke(sd->method(), sd->bci());
3268 st->print(" ");
3269 if (invoke.name() != NULL)
3270 invoke.name()->print_symbol_on(st);
3271 else
3272 st->print("<UNKNOWN>");
3273 break;
3274 }
3275 case Bytecodes::_getfield:
3276 case Bytecodes::_putfield:
3277 case Bytecodes::_getstatic:
3278 case Bytecodes::_putstatic:
3279 {
3280 Bytecode_field field(sd->method(), sd->bci());
3281 st->print(" ");
3282 if (field.name() != NULL)
3283 field.name()->print_symbol_on(st);
3284 else
3285 st->print("<UNKNOWN>");
3286 }
3287 }
3288 }
3289 st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop());
3290 }
3291
3292 // Print all scopes
3293 for (;sd != NULL; sd = sd->sender()) {
3294 st->move_to(column);
3295 st->print("; -");
3296 if (sd->method() == NULL) {
3297 st->print("method is NULL");
3298 } else {
3299 sd->method()->print_short_name(st);
3300 }
3301 int lineno = sd->method()->line_number_from_bci(sd->bci());
3302 if (lineno != -1) {
3303 st->print("@%d (line %d)", sd->bci(), lineno);
3304 } else {
3305 st->print("@%d", sd->bci());
3306 }
3307 st->cr();
3308 }
3309 }
3310
3311 // Print relocation information
3312 const char* str = reloc_string_for(begin, end);
3313 if (str != NULL) {
3314 if (sd != NULL) st->cr();
3315 st->move_to(column);
3316 st->print("; {%s}", str);
3317 }
3318 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin());
3319 if (cont_offset != 0) {
3320 st->move_to(column);
3321 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset));
3322 }
3323
3324 }
3325
3326 #ifndef PRODUCT
3327
3328 void nmethod::print_value_on(outputStream* st) const {
3329 st->print("nmethod");
3330 print_on(st, NULL);
3331 }
3332
3333 void nmethod::print_calls(outputStream* st) {
3334 RelocIterator iter(this);
3335 while (iter.next()) {
3336 switch (iter.type()) {
3337 case relocInfo::virtual_call_type:
3338 case relocInfo::opt_virtual_call_type: {
3339 VerifyMutexLocker mc(CompiledIC_lock);
3340 CompiledIC_at(&iter)->print();
3341 break;
3342 }
3343 case relocInfo::static_call_type:
3344 st->print_cr("Static call at " INTPTR_FORMAT, p2i(iter.reloc()->addr()));
3345 compiledStaticCall_at(iter.reloc())->print();
3346 break;
3347 }
3348 }
3349 }
3350
3351 void nmethod::print_handler_table() {
3352 ExceptionHandlerTable(this).print();
3353 }
3354
3355 void nmethod::print_nul_chk_table() {
3356 ImplicitExceptionTable(this).print(code_begin());
3357 }
3358
3359 void nmethod::print_statistics() {
3360 ttyLocker ttyl;
3361 if (xtty != NULL) xtty->head("statistics type='nmethod'");
3362 native_nmethod_stats.print_native_nmethod_stats();
3363 #ifdef COMPILER1
3364 c1_java_nmethod_stats.print_nmethod_stats("C1");
3365 #endif
3366 #ifdef COMPILER2
3367 c2_java_nmethod_stats.print_nmethod_stats("C2");
3368 #endif
3369 #if INCLUDE_JVMCI
3370 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI");
3371 #endif
3372 #ifdef SHARK
3373 shark_java_nmethod_stats.print_nmethod_stats("Shark");
3374 #endif
3375 unknown_java_nmethod_stats.print_nmethod_stats("Unknown");
3376 DebugInformationRecorder::print_statistics();
3377 #ifndef PRODUCT
3378 pc_nmethod_stats.print_pc_stats();
3379 #endif
3380 Dependencies::print_statistics();
3381 if (xtty != NULL) xtty->tail("statistics");
3382 }
3383
3384 #endif // !PRODUCT
3385
3386 #if INCLUDE_JVMCI
3387 char* nmethod::jvmci_installed_code_name(char* buf, size_t buflen) {
3388 if (!this->is_compiled_by_jvmci()) {
3389 return NULL;
3390 }
3391 oop installedCode = this->jvmci_installed_code();
3392 if (installedCode != NULL) {
3393 oop installedCodeName = NULL;
3394 if (installedCode->is_a(InstalledCode::klass())) {
3395 installedCodeName = InstalledCode::name(installedCode);
3396 }
3397 if (installedCodeName != NULL) {
3398 return java_lang_String::as_utf8_string(installedCodeName, buf, (int)buflen);
3399 } else {
3400 jio_snprintf(buf, buflen, "null");
3401 return buf;
3402 }
3403 }
3404 jio_snprintf(buf, buflen, "noInstalledCode");
3405 return buf;
3406 }
3407 #endif