1 /*
2 * Copyright (c) 1997, 2017, 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/nmethod.hpp"
30 #include "code/scopeDesc.hpp"
31 #include "compiler/abstractCompiler.hpp"
32 #include "compiler/compileBroker.hpp"
33 #include "compiler/compileLog.hpp"
34 #include "compiler/compilerOracle.hpp"
35 #include "compiler/disassembler.hpp"
36 #include "interpreter/bytecode.hpp"
37 #include "oops/methodData.hpp"
38 #include "prims/jvmtiRedefineClassesTrace.hpp"
39 #include "prims/jvmtiImpl.hpp"
40 #include "runtime/orderAccess.inline.hpp"
41 #include "runtime/sharedRuntime.hpp"
42 #include "runtime/sweeper.hpp"
43 #include "utilities/dtrace.hpp"
44 #include "utilities/events.hpp"
45 #include "utilities/xmlstream.hpp"
46 #ifdef SHARK
47 #include "shark/sharkCompiler.hpp"
48 #endif
49
50 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
51
52 #ifdef BUILTIN_SIM
53 #include "../../../../../simulator/simulator.hpp"
54 #endif
55
56 unsigned char nmethod::_global_unloading_clock = 0;
57
58 #ifdef DTRACE_ENABLED
59
60 // Only bother with this argument setup if dtrace is available
61
62 #ifndef USDT2
63 HS_DTRACE_PROBE_DECL8(hotspot, compiled__method__load,
64 const char*, int, const char*, int, const char*, int, void*, size_t);
65
66 HS_DTRACE_PROBE_DECL6(hotspot, compiled__method__unload,
67 char*, int, char*, int, char*, int);
68
69 #define DTRACE_METHOD_UNLOAD_PROBE(method) \
70 { \
71 Method* m = (method); \
72 if (m != NULL) { \
73 Symbol* klass_name = m->klass_name(); \
74 Symbol* name = m->name(); \
75 Symbol* signature = m->signature(); \
76 HS_DTRACE_PROBE6(hotspot, compiled__method__unload, \
77 klass_name->bytes(), klass_name->utf8_length(), \
78 name->bytes(), name->utf8_length(), \
79 signature->bytes(), signature->utf8_length()); \
80 } \
81 }
82 #else /* USDT2 */
83 #define DTRACE_METHOD_UNLOAD_PROBE(method) \
84 { \
85 Method* m = (method); \
86 if (m != NULL) { \
87 Symbol* klass_name = m->klass_name(); \
88 Symbol* name = m->name(); \
89 Symbol* signature = m->signature(); \
90 HOTSPOT_COMPILED_METHOD_UNLOAD( \
91 (char *) klass_name->bytes(), klass_name->utf8_length(), \
92 (char *) name->bytes(), name->utf8_length(), \
93 (char *) signature->bytes(), signature->utf8_length()); \
94 } \
95 }
96 #endif /* USDT2 */
97
98 #else // ndef DTRACE_ENABLED
99
100 #define DTRACE_METHOD_UNLOAD_PROBE(method)
101
102 #endif
103
104 bool nmethod::is_compiled_by_c1() const {
105 if (compiler() == NULL) {
106 return false;
107 }
108 return compiler()->is_c1();
109 }
110 bool nmethod::is_compiled_by_c2() const {
111 if (compiler() == NULL) {
112 return false;
113 }
114 return compiler()->is_c2();
115 }
116 bool nmethod::is_compiled_by_shark() const {
117 if (compiler() == NULL) {
118 return false;
119 }
120 return compiler()->is_shark();
121 }
122
123
124
125 //---------------------------------------------------------------------------------
126 // NMethod statistics
127 // They are printed under various flags, including:
128 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation.
129 // (In the latter two cases, they like other stats are printed to the log only.)
130
131 #ifndef PRODUCT
132 // These variables are put into one block to reduce relocations
133 // and make it simpler to print from the debugger.
134 static
135 struct nmethod_stats_struct {
136 int nmethod_count;
137 int total_size;
138 int relocation_size;
139 int consts_size;
140 int insts_size;
141 int stub_size;
142 int scopes_data_size;
143 int scopes_pcs_size;
144 int dependencies_size;
145 int handler_table_size;
146 int nul_chk_table_size;
147 int oops_size;
148
149 void note_nmethod(nmethod* nm) {
150 nmethod_count += 1;
151 total_size += nm->size();
152 relocation_size += nm->relocation_size();
153 consts_size += nm->consts_size();
154 insts_size += nm->insts_size();
155 stub_size += nm->stub_size();
156 oops_size += nm->oops_size();
157 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() {
164 if (nmethod_count == 0) return;
165 tty->print_cr("Statistics for %d bytecoded nmethods:", nmethod_count);
166 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size);
167 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size);
168 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size);
169 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size);
170 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size);
171 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size);
172 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size);
173 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size);
174 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size);
175 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size);
176 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size);
177 }
178
179 int native_nmethod_count;
180 int native_total_size;
181 int native_relocation_size;
182 int native_insts_size;
183 int native_oops_size;
184 void note_native_nmethod(nmethod* nm) {
185 native_nmethod_count += 1;
186 native_total_size += nm->size();
187 native_relocation_size += nm->relocation_size();
188 native_insts_size += nm->insts_size();
189 native_oops_size += nm->oops_size();
190 }
191 void print_native_nmethod_stats() {
192 if (native_nmethod_count == 0) return;
193 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count);
194 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size);
195 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size);
196 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size);
197 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size);
198 }
199
200 int pc_desc_resets; // number of resets (= number of caches)
201 int pc_desc_queries; // queries to nmethod::find_pc_desc
202 int pc_desc_approx; // number of those which have approximate true
203 int pc_desc_repeats; // number of _pc_descs[0] hits
204 int pc_desc_hits; // number of LRU cache hits
205 int pc_desc_tests; // total number of PcDesc examinations
206 int pc_desc_searches; // total number of quasi-binary search steps
207 int pc_desc_adds; // number of LUR cache insertions
208
209 void print_pc_stats() {
210 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query",
211 pc_desc_queries,
212 (double)(pc_desc_tests + pc_desc_searches)
213 / pc_desc_queries);
214 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d",
215 pc_desc_resets,
216 pc_desc_queries, pc_desc_approx,
217 pc_desc_repeats, pc_desc_hits,
218 pc_desc_tests, pc_desc_searches, pc_desc_adds);
219 }
220 } nmethod_stats;
221 #endif //PRODUCT
222
223
224 //---------------------------------------------------------------------------------
225
226
227 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) {
228 assert(pc != NULL, "Must be non null");
229 assert(exception.not_null(), "Must be non null");
230 assert(handler != NULL, "Must be non null");
231
232 _count = 0;
233 _exception_type = exception->klass();
234 _next = NULL;
235
236 add_address_and_handler(pc,handler);
237 }
238
239
240 address ExceptionCache::match(Handle exception, address pc) {
241 assert(pc != NULL,"Must be non null");
242 assert(exception.not_null(),"Must be non null");
243 if (exception->klass() == exception_type()) {
244 return (test_address(pc));
245 }
246
247 return NULL;
248 }
249
250
251 bool ExceptionCache::match_exception_with_space(Handle exception) {
252 assert(exception.not_null(),"Must be non null");
253 if (exception->klass() == exception_type() && count() < cache_size) {
254 return true;
255 }
256 return false;
257 }
258
259
260 address ExceptionCache::test_address(address addr) {
261 int limit = count();
262 for (int i = 0; i < limit; i++) {
263 if (pc_at(i) == addr) {
264 return handler_at(i);
265 }
266 }
267 return NULL;
268 }
269
270
271 bool ExceptionCache::add_address_and_handler(address addr, address handler) {
272 if (test_address(addr) == handler) return true;
273
274 int index = count();
275 if (index < cache_size) {
276 set_pc_at(index, addr);
277 set_handler_at(index, handler);
278 increment_count();
279 return true;
280 }
281 return false;
282 }
283
284
285 // private method for handling exception cache
286 // These methods are private, and used to manipulate the exception cache
287 // directly.
288 ExceptionCache* nmethod::exception_cache_entry_for_exception(Handle exception) {
289 ExceptionCache* ec = exception_cache();
290 while (ec != NULL) {
291 if (ec->match_exception_with_space(exception)) {
292 return ec;
293 }
294 ec = ec->next();
295 }
296 return NULL;
297 }
298
299
300 //-----------------------------------------------------------------------------
301
302
303 // Helper used by both find_pc_desc methods.
304 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) {
305 NOT_PRODUCT(++nmethod_stats.pc_desc_tests);
306 if (!approximate)
307 return pc->pc_offset() == pc_offset;
308 else
309 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset();
310 }
311
312 void PcDescCache::reset_to(PcDesc* initial_pc_desc) {
313 if (initial_pc_desc == NULL) {
314 _pc_descs[0] = NULL; // native method; no PcDescs at all
315 return;
316 }
317 NOT_PRODUCT(++nmethod_stats.pc_desc_resets);
318 // reset the cache by filling it with benign (non-null) values
319 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel");
320 for (int i = 0; i < cache_size; i++)
321 _pc_descs[i] = initial_pc_desc;
322 }
323
324 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) {
325 NOT_PRODUCT(++nmethod_stats.pc_desc_queries);
326 NOT_PRODUCT(if (approximate) ++nmethod_stats.pc_desc_approx);
327
328 // Note: one might think that caching the most recently
329 // read value separately would be a win, but one would be
330 // wrong. When many threads are updating it, the cache
331 // line it's in would bounce between caches, negating
332 // any benefit.
333
334 // In order to prevent race conditions do not load cache elements
335 // repeatedly, but use a local copy:
336 PcDesc* res;
337
338 // Step one: Check the most recently added value.
339 res = _pc_descs[0];
340 if (res == NULL) return NULL; // native method; no PcDescs at all
341 if (match_desc(res, pc_offset, approximate)) {
342 NOT_PRODUCT(++nmethod_stats.pc_desc_repeats);
343 return res;
344 }
345
346 // Step two: Check the rest of the LRU cache.
347 for (int i = 1; i < cache_size; ++i) {
348 res = _pc_descs[i];
349 if (res->pc_offset() < 0) break; // optimization: skip empty cache
350 if (match_desc(res, pc_offset, approximate)) {
351 NOT_PRODUCT(++nmethod_stats.pc_desc_hits);
352 return res;
353 }
354 }
355
356 // Report failure.
357 return NULL;
358 }
359
360 void PcDescCache::add_pc_desc(PcDesc* pc_desc) {
361 NOT_PRODUCT(++nmethod_stats.pc_desc_adds);
362 // Update the LRU cache by shifting pc_desc forward.
363 for (int i = 0; i < cache_size; i++) {
364 PcDesc* next = _pc_descs[i];
365 _pc_descs[i] = pc_desc;
366 pc_desc = next;
367 }
368 }
369
370 // adjust pcs_size so that it is a multiple of both oopSize and
371 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple
372 // of oopSize, then 2*sizeof(PcDesc) is)
373 static int adjust_pcs_size(int pcs_size) {
374 int nsize = round_to(pcs_size, oopSize);
375 if ((nsize % sizeof(PcDesc)) != 0) {
376 nsize = pcs_size + sizeof(PcDesc);
377 }
378 assert((nsize % oopSize) == 0, "correct alignment");
379 return nsize;
380 }
381
382 //-----------------------------------------------------------------------------
383
384
385 void nmethod::add_exception_cache_entry(ExceptionCache* new_entry) {
386 assert(ExceptionCache_lock->owned_by_self(),"Must hold the ExceptionCache_lock");
387 assert(new_entry != NULL,"Must be non null");
388 assert(new_entry->next() == NULL, "Must be null");
389
390 ExceptionCache *ec = exception_cache();
391 if (ec != NULL) {
392 new_entry->set_next(ec);
393 }
394 release_set_exception_cache(new_entry);
395 }
396
397 void nmethod::clean_exception_cache(BoolObjectClosure* is_alive) {
398 ExceptionCache* prev = NULL;
399 ExceptionCache* curr = exception_cache();
400
401 while (curr != NULL) {
402 ExceptionCache* next = curr->next();
403
404 Klass* ex_klass = curr->exception_type();
405 if (ex_klass != NULL && !ex_klass->is_loader_alive(is_alive)) {
406 if (prev == NULL) {
407 set_exception_cache(next);
408 } else {
409 prev->set_next(next);
410 }
411 delete curr;
412 // prev stays the same.
413 } else {
414 prev = curr;
415 }
416
417 curr = next;
418 }
419 }
420
421 // public method for accessing the exception cache
422 // These are the public access methods.
423 address nmethod::handler_for_exception_and_pc(Handle exception, address pc) {
424 // We never grab a lock to read the exception cache, so we may
425 // have false negatives. This is okay, as it can only happen during
426 // the first few exception lookups for a given nmethod.
427 ExceptionCache* ec = exception_cache();
428 while (ec != NULL) {
429 address ret_val;
430 if ((ret_val = ec->match(exception,pc)) != NULL) {
431 return ret_val;
432 }
433 ec = ec->next();
434 }
435 return NULL;
436 }
437
438
439 void nmethod::add_handler_for_exception_and_pc(Handle exception, address pc, address handler) {
440 // There are potential race conditions during exception cache updates, so we
441 // must own the ExceptionCache_lock before doing ANY modifications. Because
442 // we don't lock during reads, it is possible to have several threads attempt
443 // to update the cache with the same data. We need to check for already inserted
444 // copies of the current data before adding it.
445
446 MutexLocker ml(ExceptionCache_lock);
447 ExceptionCache* target_entry = exception_cache_entry_for_exception(exception);
448
449 if (target_entry == NULL || !target_entry->add_address_and_handler(pc,handler)) {
450 target_entry = new ExceptionCache(exception,pc,handler);
451 add_exception_cache_entry(target_entry);
452 }
453 }
454
455
456 //-------------end of code for ExceptionCache--------------
457
458
459 int nmethod::total_size() const {
460 return
461 consts_size() +
462 insts_size() +
463 stub_size() +
464 scopes_data_size() +
465 scopes_pcs_size() +
466 handler_table_size() +
467 nul_chk_table_size();
468 }
469
470 const char* nmethod::compile_kind() const {
471 if (is_osr_method()) return "osr";
472 if (method() != NULL && is_native_method()) return "c2n";
473 return NULL;
474 }
475
476 // Fill in default values for various flag fields
477 void nmethod::init_defaults() {
478 _state = in_use;
479 _unloading_clock = 0;
480 _marked_for_reclamation = 0;
481 _has_flushed_dependencies = 0;
482 _has_unsafe_access = 0;
483 _has_method_handle_invokes = 0;
484 _lazy_critical_native = 0;
485 _has_wide_vectors = 0;
486 _marked_for_deoptimization = 0;
487 _lock_count = 0;
488 _stack_traversal_mark = 0;
489 _unload_reported = false; // jvmti state
490
491 #ifdef ASSERT
492 _oops_are_stale = false;
493 #endif
494
495 _oops_do_mark_link = NULL;
496 _jmethod_id = NULL;
497 _osr_link = NULL;
498 if (UseG1GC || UseShenandoahGC) {
499 _unloading_next = NULL;
500 } else {
501 _scavenge_root_link = NULL;
502 }
503 _scavenge_root_state = 0;
504 _compiler = NULL;
505 #if INCLUDE_RTM_OPT
506 _rtm_state = NoRTM;
507 #endif
508 #ifdef HAVE_DTRACE_H
509 _trap_offset = 0;
510 #endif // def HAVE_DTRACE_H
511 }
512
513 nmethod* nmethod::new_native_nmethod(methodHandle method,
514 int compile_id,
515 CodeBuffer *code_buffer,
516 int vep_offset,
517 int frame_complete,
518 int frame_size,
519 ByteSize basic_lock_owner_sp_offset,
520 ByteSize basic_lock_sp_offset,
521 OopMapSet* oop_maps) {
522 code_buffer->finalize_oop_references(method);
523 // create nmethod
524 nmethod* nm = NULL;
525 {
526 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
527 int native_nmethod_size = allocation_size(code_buffer, sizeof(nmethod));
528 CodeOffsets offsets;
529 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
530 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
531 nm = new (native_nmethod_size) nmethod(method(), native_nmethod_size,
532 compile_id, &offsets,
533 code_buffer, frame_size,
534 basic_lock_owner_sp_offset,
535 basic_lock_sp_offset, oop_maps);
536 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_native_nmethod(nm));
537 if (PrintAssembly && nm != NULL) {
538 Disassembler::decode(nm);
539 }
540 }
541 // verify nmethod
542 debug_only(if (nm) nm->verify();) // might block
543
544 if (nm != NULL) {
545 nm->log_new_nmethod();
546 }
547
548 return nm;
549 }
550
551 #ifdef HAVE_DTRACE_H
552 nmethod* nmethod::new_dtrace_nmethod(methodHandle method,
553 CodeBuffer *code_buffer,
554 int vep_offset,
555 int trap_offset,
556 int frame_complete,
557 int frame_size) {
558 code_buffer->finalize_oop_references(method);
559 // create nmethod
560 nmethod* nm = NULL;
561 {
562 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
563 int nmethod_size = allocation_size(code_buffer, sizeof(nmethod));
564 CodeOffsets offsets;
565 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
566 offsets.set_value(CodeOffsets::Dtrace_trap, trap_offset);
567 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
568
569 nm = new (nmethod_size) nmethod(method(), nmethod_size,
570 &offsets, code_buffer, frame_size);
571
572 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_nmethod(nm));
573 if (PrintAssembly && nm != NULL) {
574 Disassembler::decode(nm);
575 }
576 }
577 // verify nmethod
578 debug_only(if (nm) nm->verify();) // might block
579
580 if (nm != NULL) {
581 nm->log_new_nmethod();
582 }
583
584 return nm;
585 }
586
587 #endif // def HAVE_DTRACE_H
588
589 nmethod* nmethod::new_nmethod(methodHandle method,
590 int compile_id,
591 int entry_bci,
592 CodeOffsets* offsets,
593 int orig_pc_offset,
594 DebugInformationRecorder* debug_info,
595 Dependencies* dependencies,
596 CodeBuffer* code_buffer, int frame_size,
597 OopMapSet* oop_maps,
598 ExceptionHandlerTable* handler_table,
599 ImplicitExceptionTable* nul_chk_table,
600 AbstractCompiler* compiler,
601 int comp_level
602 )
603 {
604 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
605 code_buffer->finalize_oop_references(method);
606 // create nmethod
607 nmethod* nm = NULL;
608 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
609 int nmethod_size =
610 allocation_size(code_buffer, sizeof(nmethod))
611 + adjust_pcs_size(debug_info->pcs_size())
612 + round_to(dependencies->size_in_bytes() , oopSize)
613 + round_to(handler_table->size_in_bytes(), oopSize)
614 + round_to(nul_chk_table->size_in_bytes(), oopSize)
615 + round_to(debug_info->data_size() , oopSize);
616
617 nm = new (nmethod_size)
618 nmethod(method(), nmethod_size, compile_id, entry_bci, offsets,
619 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size,
620 oop_maps,
621 handler_table,
622 nul_chk_table,
623 compiler,
624 comp_level);
625
626 if (nm != NULL) {
627 // To make dependency checking during class loading fast, record
628 // the nmethod dependencies in the classes it is dependent on.
629 // This allows the dependency checking code to simply walk the
630 // class hierarchy above the loaded class, checking only nmethods
631 // which are dependent on those classes. The slow way is to
632 // check every nmethod for dependencies which makes it linear in
633 // the number of methods compiled. For applications with a lot
634 // classes the slow way is too slow.
635 for (Dependencies::DepStream deps(nm); deps.next(); ) {
636 Klass* klass = deps.context_type();
637 if (klass == NULL) {
638 continue; // ignore things like evol_method
639 }
640
641 // record this nmethod as dependent on this klass
642 InstanceKlass::cast(klass)->add_dependent_nmethod(nm);
643 }
644 NOT_PRODUCT(nmethod_stats.note_nmethod(nm));
645 if (PrintAssembly || CompilerOracle::has_option_string(method, "PrintAssembly")) {
646 Disassembler::decode(nm);
647 }
648 }
649 }
650 // Do verification and logging outside CodeCache_lock.
651 if (nm != NULL) {
652 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
653 DEBUG_ONLY(nm->verify();)
654 nm->log_new_nmethod();
655 }
656 return nm;
657 }
658
659
660 // For native wrappers
661 nmethod::nmethod(
662 Method* method,
663 int nmethod_size,
664 int compile_id,
665 CodeOffsets* offsets,
666 CodeBuffer* code_buffer,
667 int frame_size,
668 ByteSize basic_lock_owner_sp_offset,
669 ByteSize basic_lock_sp_offset,
670 OopMapSet* oop_maps )
671 : CodeBlob("native nmethod", code_buffer, sizeof(nmethod),
672 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps),
673 _native_receiver_sp_offset(basic_lock_owner_sp_offset),
674 _native_basic_lock_sp_offset(basic_lock_sp_offset)
675 {
676 {
677 debug_only(No_Safepoint_Verifier nsv;)
678 assert_locked_or_safepoint(CodeCache_lock);
679
680 init_defaults();
681 _method = method;
682 _entry_bci = InvocationEntryBci;
683 // We have no exception handler or deopt handler make the
684 // values something that will never match a pc like the nmethod vtable entry
685 _exception_offset = 0;
686 _deoptimize_offset = 0;
687 _deoptimize_mh_offset = 0;
688 _orig_pc_offset = 0;
689
690 _consts_offset = data_offset();
691 _stub_offset = data_offset();
692 _oops_offset = data_offset();
693 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize);
694 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize);
695 _scopes_pcs_offset = _scopes_data_offset;
696 _dependencies_offset = _scopes_pcs_offset;
697 _handler_table_offset = _dependencies_offset;
698 _nul_chk_table_offset = _handler_table_offset;
699 _nmethod_end_offset = _nul_chk_table_offset;
700 _compile_id = compile_id;
701 _comp_level = CompLevel_none;
702 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
703 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
704 _osr_entry_point = NULL;
705 _exception_cache = NULL;
706 _pc_desc_cache.reset_to(NULL);
707 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
708
709 code_buffer->copy_values_to(this);
710 if (ScavengeRootsInCode) {
711 if (detect_scavenge_root_oops()) {
712 CodeCache::add_scavenge_root_nmethod(this);
713 }
714 Universe::heap()->register_nmethod(this);
715 }
716 debug_only(verify_scavenge_root_oops());
717
718 #ifdef BUILTIN_SIM
719 if (NotifySimulator) {
720 unsigned char *base = code_buffer->insts()->start();
721 long delta = entry_point() - base;
722 AArch64Simulator::get_current(UseSimulatorCache, DisableBCCheck)->notifyRelocate(base, delta);
723 }
724 #endif
725
726 CodeCache::commit(this);
727 }
728
729 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
730 ttyLocker ttyl; // keep the following output all in one block
731 // This output goes directly to the tty, not the compiler log.
732 // To enable tools to match it up with the compilation activity,
733 // be sure to tag this tty output with the compile ID.
734 if (xtty != NULL) {
735 xtty->begin_head("print_native_nmethod");
736 xtty->method(_method);
737 xtty->stamp();
738 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
739 }
740 // print the header part first
741 print();
742 // then print the requested information
743 if (PrintNativeNMethods) {
744 print_code();
745 if (oop_maps != NULL) {
746 oop_maps->print();
747 }
748 }
749 if (PrintRelocations) {
750 print_relocations();
751 }
752 if (xtty != NULL) {
753 xtty->tail("print_native_nmethod");
754 }
755 }
756 }
757
758 // For dtrace wrappers
759 #ifdef HAVE_DTRACE_H
760 nmethod::nmethod(
761 Method* method,
762 int nmethod_size,
763 CodeOffsets* offsets,
764 CodeBuffer* code_buffer,
765 int frame_size)
766 : CodeBlob("dtrace nmethod", code_buffer, sizeof(nmethod),
767 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, NULL),
768 _native_receiver_sp_offset(in_ByteSize(-1)),
769 _native_basic_lock_sp_offset(in_ByteSize(-1))
770 {
771 {
772 debug_only(No_Safepoint_Verifier nsv;)
773 assert_locked_or_safepoint(CodeCache_lock);
774
775 init_defaults();
776 _method = method;
777 _entry_bci = InvocationEntryBci;
778 // We have no exception handler or deopt handler make the
779 // values something that will never match a pc like the nmethod vtable entry
780 _exception_offset = 0;
781 _deoptimize_offset = 0;
782 _deoptimize_mh_offset = 0;
783 _unwind_handler_offset = -1;
784 _trap_offset = offsets->value(CodeOffsets::Dtrace_trap);
785 _orig_pc_offset = 0;
786 _consts_offset = data_offset();
787 _stub_offset = data_offset();
788 _oops_offset = data_offset();
789 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize);
790 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize);
791 _scopes_pcs_offset = _scopes_data_offset;
792 _dependencies_offset = _scopes_pcs_offset;
793 _handler_table_offset = _dependencies_offset;
794 _nul_chk_table_offset = _handler_table_offset;
795 _nmethod_end_offset = _nul_chk_table_offset;
796 _compile_id = 0; // default
797 _comp_level = CompLevel_none;
798 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
799 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
800 _osr_entry_point = NULL;
801 _exception_cache = NULL;
802 _pc_desc_cache.reset_to(NULL);
803 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
804
805 code_buffer->copy_values_to(this);
806 if (ScavengeRootsInCode) {
807 if (detect_scavenge_root_oops()) {
808 CodeCache::add_scavenge_root_nmethod(this);
809 }
810 Universe::heap()->register_nmethod(this);
811 }
812 DEBUG_ONLY(verify_scavenge_root_oops();)
813 CodeCache::commit(this);
814 }
815
816 if (PrintNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
817 ttyLocker ttyl; // keep the following output all in one block
818 // This output goes directly to the tty, not the compiler log.
819 // To enable tools to match it up with the compilation activity,
820 // be sure to tag this tty output with the compile ID.
821 if (xtty != NULL) {
822 xtty->begin_head("print_dtrace_nmethod");
823 xtty->method(_method);
824 xtty->stamp();
825 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
826 }
827 // print the header part first
828 print();
829 // then print the requested information
830 if (PrintNMethods) {
831 print_code();
832 }
833 if (PrintRelocations) {
834 print_relocations();
835 }
836 if (xtty != NULL) {
837 xtty->tail("print_dtrace_nmethod");
838 }
839 }
840 }
841 #endif // def HAVE_DTRACE_H
842
843 void* nmethod::operator new(size_t size, int nmethod_size) throw() {
844 // Not critical, may return null if there is too little continuous memory
845 return CodeCache::allocate(nmethod_size);
846 }
847
848 nmethod::nmethod(
849 Method* method,
850 int nmethod_size,
851 int compile_id,
852 int entry_bci,
853 CodeOffsets* offsets,
854 int orig_pc_offset,
855 DebugInformationRecorder* debug_info,
856 Dependencies* dependencies,
857 CodeBuffer *code_buffer,
858 int frame_size,
859 OopMapSet* oop_maps,
860 ExceptionHandlerTable* handler_table,
861 ImplicitExceptionTable* nul_chk_table,
862 AbstractCompiler* compiler,
863 int comp_level
864 )
865 : CodeBlob("nmethod", code_buffer, sizeof(nmethod),
866 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps),
867 _native_receiver_sp_offset(in_ByteSize(-1)),
868 _native_basic_lock_sp_offset(in_ByteSize(-1))
869 {
870 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
871 {
872 debug_only(No_Safepoint_Verifier nsv;)
873 assert_locked_or_safepoint(CodeCache_lock);
874
875 init_defaults();
876 _method = method;
877 _entry_bci = entry_bci;
878 _compile_id = compile_id;
879 _comp_level = comp_level;
880 _compiler = compiler;
881 _orig_pc_offset = orig_pc_offset;
882 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
883
884 // Section offsets
885 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts());
886 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs());
887
888 // Exception handler and deopt handler are in the stub section
889 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set");
890 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set");
891 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
892 _deoptimize_offset = _stub_offset + offsets->value(CodeOffsets::Deopt);
893 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
894 _deoptimize_mh_offset = _stub_offset + offsets->value(CodeOffsets::DeoptMH);
895 } else {
896 _deoptimize_mh_offset = -1;
897 }
898 if (offsets->value(CodeOffsets::UnwindHandler) != -1) {
899 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler);
900 } else {
901 _unwind_handler_offset = -1;
902 }
903
904 _oops_offset = data_offset();
905 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize);
906 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize);
907
908 _scopes_pcs_offset = _scopes_data_offset + round_to(debug_info->data_size (), oopSize);
909 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
910 _handler_table_offset = _dependencies_offset + round_to(dependencies->size_in_bytes (), oopSize);
911 _nul_chk_table_offset = _handler_table_offset + round_to(handler_table->size_in_bytes(), oopSize);
912 _nmethod_end_offset = _nul_chk_table_offset + round_to(nul_chk_table->size_in_bytes(), oopSize);
913
914 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
915 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
916 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry);
917 _exception_cache = NULL;
918 _pc_desc_cache.reset_to(scopes_pcs_begin());
919
920 // Copy contents of ScopeDescRecorder to nmethod
921 code_buffer->copy_values_to(this);
922 debug_info->copy_to(this);
923 dependencies->copy_to(this);
924 if (ScavengeRootsInCode) {
925 if (detect_scavenge_root_oops()) {
926 CodeCache::add_scavenge_root_nmethod(this);
927 }
928 Universe::heap()->register_nmethod(this);
929 }
930 debug_only(verify_scavenge_root_oops());
931
932 #ifdef BUILTIN_SIM
933 if (NotifySimulator) {
934 unsigned char *base = code_buffer->insts()->start();
935 long delta = entry_point() - base;
936 AArch64Simulator::get_current(UseSimulatorCache, DisableBCCheck)->notifyRelocate(base, delta);
937 }
938 #endif
939
940 CodeCache::commit(this);
941
942 // Copy contents of ExceptionHandlerTable to nmethod
943 handler_table->copy_to(this);
944 nul_chk_table->copy_to(this);
945
946 // we use the information of entry points to find out if a method is
947 // static or non static
948 assert(compiler->is_c2() ||
949 _method->is_static() == (entry_point() == _verified_entry_point),
950 " entry points must be same for static methods and vice versa");
951 }
952
953 bool printnmethods = PrintNMethods
954 || CompilerOracle::should_print(_method)
955 || CompilerOracle::has_option_string(_method, "PrintNMethods");
956 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
957 print_nmethod(printnmethods);
958 }
959 }
960
961
962 // Print a short set of xml attributes to identify this nmethod. The
963 // output should be embedded in some other element.
964 void nmethod::log_identity(xmlStream* log) const {
965 log->print(" compile_id='%d'", compile_id());
966 const char* nm_kind = compile_kind();
967 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind);
968 if (compiler() != NULL) {
969 log->print(" compiler='%s'", compiler()->name());
970 }
971 if (TieredCompilation) {
972 log->print(" level='%d'", comp_level());
973 }
974 }
975
976
977 #define LOG_OFFSET(log, name) \
978 if ((intptr_t)name##_end() - (intptr_t)name##_begin()) \
979 log->print(" " XSTR(name) "_offset='%d'" , \
980 (intptr_t)name##_begin() - (intptr_t)this)
981
982
983 void nmethod::log_new_nmethod() const {
984 if (LogCompilation && xtty != NULL) {
985 ttyLocker ttyl;
986 HandleMark hm;
987 xtty->begin_elem("nmethod");
988 log_identity(xtty);
989 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", code_begin(), size());
990 xtty->print(" address='" INTPTR_FORMAT "'", (intptr_t) this);
991
992 LOG_OFFSET(xtty, relocation);
993 LOG_OFFSET(xtty, consts);
994 LOG_OFFSET(xtty, insts);
995 LOG_OFFSET(xtty, stub);
996 LOG_OFFSET(xtty, scopes_data);
997 LOG_OFFSET(xtty, scopes_pcs);
998 LOG_OFFSET(xtty, dependencies);
999 LOG_OFFSET(xtty, handler_table);
1000 LOG_OFFSET(xtty, nul_chk_table);
1001 LOG_OFFSET(xtty, oops);
1002
1003 xtty->method(method());
1004 xtty->stamp();
1005 xtty->end_elem();
1006 }
1007 }
1008
1009 #undef LOG_OFFSET
1010
1011
1012 // Print out more verbose output usually for a newly created nmethod.
1013 void nmethod::print_on(outputStream* st, const char* msg) const {
1014 if (st != NULL) {
1015 ttyLocker ttyl;
1016 if (WizardMode) {
1017 CompileTask::print_compilation(st, this, msg, /*short_form:*/ true);
1018 st->print_cr(" (" INTPTR_FORMAT ")", this);
1019 } else {
1020 CompileTask::print_compilation(st, this, msg, /*short_form:*/ false);
1021 }
1022 }
1023 }
1024
1025
1026 void nmethod::print_nmethod(bool printmethod) {
1027 ttyLocker ttyl; // keep the following output all in one block
1028 if (xtty != NULL) {
1029 xtty->begin_head("print_nmethod");
1030 xtty->stamp();
1031 xtty->end_head();
1032 }
1033 // print the header part first
1034 print();
1035 // then print the requested information
1036 if (printmethod) {
1037 print_code();
1038 print_pcs();
1039 if (oop_maps()) {
1040 oop_maps()->print();
1041 }
1042 }
1043 if (PrintDebugInfo) {
1044 print_scopes();
1045 }
1046 if (PrintRelocations) {
1047 print_relocations();
1048 }
1049 if (PrintDependencies) {
1050 print_dependencies();
1051 }
1052 if (PrintExceptionHandlers) {
1053 print_handler_table();
1054 print_nul_chk_table();
1055 }
1056 if (xtty != NULL) {
1057 xtty->tail("print_nmethod");
1058 }
1059 }
1060
1061
1062 // Promote one word from an assembly-time handle to a live embedded oop.
1063 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
1064 if (handle == NULL ||
1065 // As a special case, IC oops are initialized to 1 or -1.
1066 handle == (jobject) Universe::non_oop_word()) {
1067 (*dest) = (oop) handle;
1068 } else {
1069 (*dest) = JNIHandles::resolve_non_null(handle);
1070 }
1071 }
1072
1073
1074 // Have to have the same name because it's called by a template
1075 void nmethod::copy_values(GrowableArray<jobject>* array) {
1076 int length = array->length();
1077 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
1078 oop* dest = oops_begin();
1079 for (int index = 0 ; index < length; index++) {
1080 initialize_immediate_oop(&dest[index], array->at(index));
1081 }
1082
1083 // Now we can fix up all the oops in the code. We need to do this
1084 // in the code because the assembler uses jobjects as placeholders.
1085 // The code and relocations have already been initialized by the
1086 // CodeBlob constructor, so it is valid even at this early point to
1087 // iterate over relocations and patch the code.
1088 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true);
1089 }
1090
1091 void nmethod::copy_values(GrowableArray<Metadata*>* array) {
1092 int length = array->length();
1093 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough");
1094 Metadata** dest = metadata_begin();
1095 for (int index = 0 ; index < length; index++) {
1096 dest[index] = array->at(index);
1097 }
1098 }
1099
1100 bool nmethod::is_at_poll_return(address pc) {
1101 RelocIterator iter(this, pc, pc+1);
1102 while (iter.next()) {
1103 if (iter.type() == relocInfo::poll_return_type)
1104 return true;
1105 }
1106 return false;
1107 }
1108
1109
1110 bool nmethod::is_at_poll_or_poll_return(address pc) {
1111 RelocIterator iter(this, pc, pc+1);
1112 while (iter.next()) {
1113 relocInfo::relocType t = iter.type();
1114 if (t == relocInfo::poll_return_type || t == relocInfo::poll_type)
1115 return true;
1116 }
1117 return false;
1118 }
1119
1120
1121 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) {
1122 // re-patch all oop-bearing instructions, just in case some oops moved
1123 RelocIterator iter(this, begin, end);
1124 while (iter.next()) {
1125 if (iter.type() == relocInfo::oop_type) {
1126 oop_Relocation* reloc = iter.oop_reloc();
1127 if (initialize_immediates && reloc->oop_is_immediate()) {
1128 oop* dest = reloc->oop_addr();
1129 initialize_immediate_oop(dest, (jobject) *dest);
1130 }
1131 // Refresh the oop-related bits of this instruction.
1132 reloc->fix_oop_relocation();
1133 } else if (iter.type() == relocInfo::metadata_type) {
1134 metadata_Relocation* reloc = iter.metadata_reloc();
1135 reloc->fix_metadata_relocation();
1136 }
1137 }
1138 }
1139
1140
1141 void nmethod::verify_oop_relocations() {
1142 // Ensure sure that the code matches the current oop values
1143 RelocIterator iter(this, NULL, NULL);
1144 while (iter.next()) {
1145 if (iter.type() == relocInfo::oop_type) {
1146 oop_Relocation* reloc = iter.oop_reloc();
1147 if (!reloc->oop_is_immediate()) {
1148 reloc->verify_oop_relocation();
1149 }
1150 }
1151 }
1152 }
1153
1154
1155 ScopeDesc* nmethod::scope_desc_at(address pc) {
1156 PcDesc* pd = pc_desc_at(pc);
1157 guarantee(pd != NULL, "scope must be present");
1158 return new ScopeDesc(this, pd->scope_decode_offset(),
1159 pd->obj_decode_offset(), pd->should_reexecute(),
1160 pd->return_oop());
1161 }
1162
1163
1164 void nmethod::clear_inline_caches() {
1165 assert(SafepointSynchronize::is_at_safepoint(), "cleaning of IC's only allowed at safepoint");
1166 if (is_zombie()) {
1167 return;
1168 }
1169
1170 RelocIterator iter(this);
1171 while (iter.next()) {
1172 iter.reloc()->clear_inline_cache();
1173 }
1174 }
1175
1176 // Clear ICStubs of all compiled ICs
1177 void nmethod::clear_ic_stubs() {
1178 assert_locked_or_safepoint(CompiledIC_lock);
1179 ResourceMark rm;
1180 RelocIterator iter(this);
1181 while(iter.next()) {
1182 if (iter.type() == relocInfo::virtual_call_type) {
1183 CompiledIC* ic = CompiledIC_at(&iter);
1184 ic->clear_ic_stub();
1185 }
1186 }
1187 }
1188
1189
1190 void nmethod::cleanup_inline_caches() {
1191 assert_locked_or_safepoint(CompiledIC_lock);
1192
1193 // If the method is not entrant or zombie then a JMP is plastered over the
1194 // first few bytes. If an oop in the old code was there, that oop
1195 // should not get GC'd. Skip the first few bytes of oops on
1196 // not-entrant methods.
1197 address low_boundary = verified_entry_point();
1198 if (!is_in_use()) {
1199 low_boundary += NativeJump::instruction_size;
1200 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1201 // This means that the low_boundary is going to be a little too high.
1202 // This shouldn't matter, since oops of non-entrant methods are never used.
1203 // In fact, why are we bothering to look at oops in a non-entrant method??
1204 }
1205
1206 // Find all calls in an nmethod and clear the ones that point to non-entrant,
1207 // zombie and unloaded nmethods.
1208 ResourceMark rm;
1209 RelocIterator iter(this, low_boundary);
1210 while(iter.next()) {
1211 switch(iter.type()) {
1212 case relocInfo::virtual_call_type:
1213 case relocInfo::opt_virtual_call_type: {
1214 CompiledIC *ic = CompiledIC_at(&iter);
1215 // Ok, to lookup references to zombies here
1216 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
1217 if( cb != NULL && cb->is_nmethod() ) {
1218 nmethod* nm = (nmethod*)cb;
1219 // Clean inline caches pointing to zombie, non-entrant and unloaded methods
1220 if (!nm->is_in_use() || (nm->method()->code() != nm)) ic->set_to_clean(is_alive());
1221 }
1222 break;
1223 }
1224 case relocInfo::static_call_type: {
1225 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
1226 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
1227 if( cb != NULL && cb->is_nmethod() ) {
1228 nmethod* nm = (nmethod*)cb;
1229 // Clean inline caches pointing to zombie, non-entrant and unloaded methods
1230 if (!nm->is_in_use() || (nm->method()->code() != nm)) csc->set_to_clean();
1231 }
1232 break;
1233 }
1234 }
1235 }
1236 }
1237
1238 void nmethod::verify_clean_inline_caches() {
1239 assert_locked_or_safepoint(CompiledIC_lock);
1240
1241 // If the method is not entrant or zombie then a JMP is plastered over the
1242 // first few bytes. If an oop in the old code was there, that oop
1243 // should not get GC'd. Skip the first few bytes of oops on
1244 // not-entrant methods.
1245 address low_boundary = verified_entry_point();
1246 if (!is_in_use()) {
1247 low_boundary += NativeJump::instruction_size;
1248 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1249 // This means that the low_boundary is going to be a little too high.
1250 // This shouldn't matter, since oops of non-entrant methods are never used.
1251 // In fact, why are we bothering to look at oops in a non-entrant method??
1252 }
1253
1254 ResourceMark rm;
1255 RelocIterator iter(this, low_boundary);
1256 while(iter.next()) {
1257 switch(iter.type()) {
1258 case relocInfo::virtual_call_type:
1259 case relocInfo::opt_virtual_call_type: {
1260 CompiledIC *ic = CompiledIC_at(&iter);
1261 // Ok, to lookup references to zombies here
1262 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
1263 if( cb != NULL && cb->is_nmethod() ) {
1264 nmethod* nm = (nmethod*)cb;
1265 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
1266 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1267 assert(ic->is_clean(), "IC should be clean");
1268 }
1269 }
1270 break;
1271 }
1272 case relocInfo::static_call_type: {
1273 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
1274 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
1275 if( cb != NULL && cb->is_nmethod() ) {
1276 nmethod* nm = (nmethod*)cb;
1277 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
1278 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1279 assert(csc->is_clean(), "IC should be clean");
1280 }
1281 }
1282 break;
1283 }
1284 }
1285 }
1286 }
1287
1288 int nmethod::verify_icholder_relocations() {
1289 int count = 0;
1290
1291 RelocIterator iter(this);
1292 while(iter.next()) {
1293 if (iter.type() == relocInfo::virtual_call_type) {
1294 if (CompiledIC::is_icholder_call_site(iter.virtual_call_reloc())) {
1295 CompiledIC *ic = CompiledIC_at(&iter);
1296 if (TraceCompiledIC) {
1297 tty->print("noticed icholder " INTPTR_FORMAT " ", p2i(ic->cached_icholder()));
1298 ic->print();
1299 }
1300 assert(ic->cached_icholder() != NULL, "must be non-NULL");
1301 count++;
1302 }
1303 }
1304 }
1305
1306 return count;
1307 }
1308
1309 // This is a private interface with the sweeper.
1310 void nmethod::mark_as_seen_on_stack() {
1311 assert(is_alive(), "Must be an alive method");
1312 // Set the traversal mark to ensure that the sweeper does 2
1313 // cleaning passes before moving to zombie.
1314 set_stack_traversal_mark(NMethodSweeper::traversal_count());
1315 }
1316
1317 // Tell if a non-entrant method can be converted to a zombie (i.e.,
1318 // there are no activations on the stack, not in use by the VM,
1319 // and not in use by the ServiceThread)
1320 bool nmethod::can_convert_to_zombie() {
1321 assert(is_not_entrant(), "must be a non-entrant method");
1322
1323 // Since the nmethod sweeper only does partial sweep the sweeper's traversal
1324 // count can be greater than the stack traversal count before it hits the
1325 // nmethod for the second time.
1326 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count() &&
1327 !is_locked_by_vm();
1328 }
1329
1330 void nmethod::inc_decompile_count() {
1331 if (!is_compiled_by_c2()) return;
1332 // Could be gated by ProfileTraps, but do not bother...
1333 Method* m = method();
1334 if (m == NULL) return;
1335 MethodData* mdo = m->method_data();
1336 if (mdo == NULL) return;
1337 // There is a benign race here. See comments in methodData.hpp.
1338 mdo->inc_decompile_count();
1339 }
1340
1341 void nmethod::increase_unloading_clock() {
1342 _global_unloading_clock++;
1343 if (_global_unloading_clock == 0) {
1344 // _nmethods are allocated with _unloading_clock == 0,
1345 // so 0 is never used as a clock value.
1346 _global_unloading_clock = 1;
1347 }
1348 }
1349
1350 void nmethod::set_unloading_clock(unsigned char unloading_clock) {
1351 OrderAccess::release_store((volatile jubyte*)&_unloading_clock, unloading_clock);
1352 }
1353
1354 unsigned char nmethod::unloading_clock() {
1355 return (unsigned char)OrderAccess::load_acquire((volatile jubyte*)&_unloading_clock);
1356 }
1357
1358 void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) {
1359
1360 post_compiled_method_unload();
1361
1362 // Since this nmethod is being unloaded, make sure that dependencies
1363 // recorded in instanceKlasses get flushed and pass non-NULL closure to
1364 // indicate that this work is being done during a GC.
1365 assert(Universe::heap()->is_gc_active(), "should only be called during gc");
1366 assert(is_alive != NULL, "Should be non-NULL");
1367 // A non-NULL is_alive closure indicates that this is being called during GC.
1368 flush_dependencies(is_alive);
1369
1370 // Break cycle between nmethod & method
1371 if (TraceClassUnloading && WizardMode) {
1372 tty->print_cr("[Class unloading: Making nmethod " INTPTR_FORMAT
1373 " unloadable], Method*(" INTPTR_FORMAT
1374 "), cause(" INTPTR_FORMAT ")",
1375 this, (address)_method, (address)cause);
1376 if (!Universe::heap()->is_gc_active())
1377 cause->klass()->print();
1378 }
1379 // Unlink the osr method, so we do not look this up again
1380 if (is_osr_method()) {
1381 invalidate_osr_method();
1382 }
1383 // If _method is already NULL the Method* is about to be unloaded,
1384 // so we don't have to break the cycle. Note that it is possible to
1385 // have the Method* live here, in case we unload the nmethod because
1386 // it is pointing to some oop (other than the Method*) being unloaded.
1387 if (_method != NULL) {
1388 // OSR methods point to the Method*, but the Method* does not
1389 // point back!
1390 if (_method->code() == this) {
1391 _method->clear_code(); // Break a cycle
1392 }
1393 _method = NULL; // Clear the method of this dead nmethod
1394 }
1395 // Make the class unloaded - i.e., change state and notify sweeper
1396 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
1397 if (is_in_use()) {
1398 // Transitioning directly from live to unloaded -- so
1399 // we need to force a cache clean-up; remember this
1400 // for later on.
1401 CodeCache::set_needs_cache_clean(true);
1402 }
1403
1404 // Unregister must be done before the state change
1405 Universe::heap()->unregister_nmethod(this);
1406
1407 _state = unloaded;
1408
1409 // Log the unloading.
1410 log_state_change();
1411
1412 // The Method* is gone at this point
1413 assert(_method == NULL, "Tautology");
1414
1415 set_osr_link(NULL);
1416 //set_scavenge_root_link(NULL); // done by prune_scavenge_root_nmethods
1417 NMethodSweeper::report_state_change(this);
1418 }
1419
1420 void nmethod::invalidate_osr_method() {
1421 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
1422 // Remove from list of active nmethods
1423 if (method() != NULL)
1424 method()->method_holder()->remove_osr_nmethod(this);
1425 // Set entry as invalid
1426 _entry_bci = InvalidOSREntryBci;
1427 }
1428
1429 void nmethod::log_state_change() const {
1430 if (LogCompilation) {
1431 if (xtty != NULL) {
1432 ttyLocker ttyl; // keep the following output all in one block
1433 if (_state == unloaded) {
1434 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'",
1435 os::current_thread_id());
1436 } else {
1437 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s",
1438 os::current_thread_id(),
1439 (_state == zombie ? " zombie='1'" : ""));
1440 }
1441 log_identity(xtty);
1442 xtty->stamp();
1443 xtty->end_elem();
1444 }
1445 }
1446 if (PrintCompilation && _state != unloaded) {
1447 print_on(tty, _state == zombie ? "made zombie" : "made not entrant");
1448 }
1449 }
1450
1451 /**
1452 * Common functionality for both make_not_entrant and make_zombie
1453 */
1454 bool nmethod::make_not_entrant_or_zombie(unsigned int state) {
1455 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant");
1456 assert(!is_zombie(), "should not already be a zombie");
1457
1458 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below.
1459 nmethodLocker nml(this);
1460 methodHandle the_method(method());
1461 No_Safepoint_Verifier nsv;
1462
1463 // during patching, depending on the nmethod state we must notify the GC that
1464 // code has been unloaded, unregistering it. We cannot do this right while
1465 // holding the Patching_lock because we need to use the CodeCache_lock. This
1466 // would be prone to deadlocks.
1467 // This flag is used to remember whether we need to later lock and unregister.
1468 bool nmethod_needs_unregister = false;
1469
1470 {
1471 // invalidate osr nmethod before acquiring the patching lock since
1472 // they both acquire leaf locks and we don't want a deadlock.
1473 // This logic is equivalent to the logic below for patching the
1474 // verified entry point of regular methods.
1475 if (is_osr_method()) {
1476 // this effectively makes the osr nmethod not entrant
1477 invalidate_osr_method();
1478 }
1479
1480 // Enter critical section. Does not block for safepoint.
1481 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1482
1483 if (_state == state) {
1484 // another thread already performed this transition so nothing
1485 // to do, but return false to indicate this.
1486 return false;
1487 }
1488
1489 // The caller can be calling the method statically or through an inline
1490 // cache call.
1491 if (!is_osr_method() && !is_not_entrant()) {
1492 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
1493 SharedRuntime::get_handle_wrong_method_stub());
1494 }
1495
1496 if (is_in_use()) {
1497 // It's a true state change, so mark the method as decompiled.
1498 // Do it only for transition from alive.
1499 inc_decompile_count();
1500 }
1501
1502 // If the state is becoming a zombie, signal to unregister the nmethod with
1503 // the heap.
1504 // This nmethod may have already been unloaded during a full GC.
1505 if ((state == zombie) && !is_unloaded()) {
1506 nmethod_needs_unregister = true;
1507 }
1508
1509 // Must happen before state change. Otherwise we have a race condition in
1510 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately
1511 // transition its state from 'not_entrant' to 'zombie' without having to wait
1512 // for stack scanning.
1513 if (state == not_entrant) {
1514 mark_as_seen_on_stack();
1515 OrderAccess::storestore();
1516 }
1517
1518 // Change state
1519 _state = state;
1520
1521 // Log the transition once
1522 log_state_change();
1523
1524 // Remove nmethod from method.
1525 // We need to check if both the _code and _from_compiled_code_entry_point
1526 // refer to this nmethod because there is a race in setting these two fields
1527 // in Method* as seen in bugid 4947125.
1528 // If the vep() points to the zombie nmethod, the memory for the nmethod
1529 // could be flushed and the compiler and vtable stubs could still call
1530 // through it.
1531 if (method() != NULL && (method()->code() == this ||
1532 method()->from_compiled_entry() == verified_entry_point())) {
1533 HandleMark hm;
1534 method()->clear_code(false /* already owns Patching_lock */);
1535 }
1536 } // leave critical region under Patching_lock
1537
1538 // When the nmethod becomes zombie it is no longer alive so the
1539 // dependencies must be flushed. nmethods in the not_entrant
1540 // state will be flushed later when the transition to zombie
1541 // happens or they get unloaded.
1542 if (state == zombie) {
1543 {
1544 // Flushing dependecies must be done before any possible
1545 // safepoint can sneak in, otherwise the oops used by the
1546 // dependency logic could have become stale.
1547 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1548 if (nmethod_needs_unregister) {
1549 Universe::heap()->unregister_nmethod(this);
1550 }
1551 flush_dependencies(NULL);
1552 }
1553
1554 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload
1555 // event and it hasn't already been reported for this nmethod then
1556 // report it now. The event may have been reported earilier if the GC
1557 // marked it for unloading). JvmtiDeferredEventQueue support means
1558 // we no longer go to a safepoint here.
1559 post_compiled_method_unload();
1560
1561 #ifdef ASSERT
1562 // It's no longer safe to access the oops section since zombie
1563 // nmethods aren't scanned for GC.
1564 _oops_are_stale = true;
1565 #endif
1566 // the Method may be reclaimed by class unloading now that the
1567 // nmethod is in zombie state
1568 set_method(NULL);
1569 } else {
1570 assert(state == not_entrant, "other cases may need to be handled differently");
1571 }
1572
1573 if (TraceCreateZombies) {
1574 tty->print_cr("nmethod <" INTPTR_FORMAT "> code made %s", this, (state == not_entrant) ? "not entrant" : "zombie");
1575 }
1576
1577 NMethodSweeper::report_state_change(this);
1578 return true;
1579 }
1580
1581 void nmethod::flush() {
1582 // Note that there are no valid oops in the nmethod anymore.
1583 assert(is_zombie() || (is_osr_method() && is_unloaded()), "must be a zombie method");
1584 assert(is_marked_for_reclamation() || (is_osr_method() && is_unloaded()), "must be marked for reclamation");
1585
1586 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed");
1587 assert_locked_or_safepoint(CodeCache_lock);
1588
1589 // completely deallocate this method
1590 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, this);
1591 if (PrintMethodFlushing) {
1592 tty->print_cr("*flushing nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT "/Free CodeCache:" SIZE_FORMAT "Kb",
1593 _compile_id, this, CodeCache::nof_blobs(), CodeCache::unallocated_capacity()/1024);
1594 }
1595
1596 // We need to deallocate any ExceptionCache data.
1597 // Note that we do not need to grab the nmethod lock for this, it
1598 // better be thread safe if we're disposing of it!
1599 ExceptionCache* ec = exception_cache();
1600 set_exception_cache(NULL);
1601 while(ec != NULL) {
1602 ExceptionCache* next = ec->next();
1603 delete ec;
1604 ec = next;
1605 }
1606
1607 if (on_scavenge_root_list()) {
1608 CodeCache::drop_scavenge_root_nmethod(this);
1609 }
1610
1611 #ifdef SHARK
1612 ((SharkCompiler *) compiler())->free_compiled_method(insts_begin());
1613 #endif // SHARK
1614
1615 ((CodeBlob*)(this))->flush();
1616
1617 CodeCache::free(this);
1618 }
1619
1620
1621 //
1622 // Notify all classes this nmethod is dependent on that it is no
1623 // longer dependent. This should only be called in two situations.
1624 // First, when a nmethod transitions to a zombie all dependents need
1625 // to be clear. Since zombification happens at a safepoint there's no
1626 // synchronization issues. The second place is a little more tricky.
1627 // During phase 1 of mark sweep class unloading may happen and as a
1628 // result some nmethods may get unloaded. In this case the flushing
1629 // of dependencies must happen during phase 1 since after GC any
1630 // dependencies in the unloaded nmethod won't be updated, so
1631 // traversing the dependency information in unsafe. In that case this
1632 // function is called with a non-NULL argument and this function only
1633 // notifies instanceKlasses that are reachable
1634
1635 void nmethod::flush_dependencies(BoolObjectClosure* is_alive) {
1636 assert_locked_or_safepoint(CodeCache_lock);
1637 assert(Universe::heap()->is_gc_active() == (is_alive != NULL),
1638 "is_alive is non-NULL if and only if we are called during GC");
1639 if (!has_flushed_dependencies()) {
1640 set_has_flushed_dependencies();
1641 for (Dependencies::DepStream deps(this); deps.next(); ) {
1642 Klass* klass = deps.context_type();
1643 if (klass == NULL) continue; // ignore things like evol_method
1644
1645 // During GC the is_alive closure is non-NULL, and is used to
1646 // determine liveness of dependees that need to be updated.
1647 if (is_alive == NULL || klass->is_loader_alive(is_alive)) {
1648 // The GC defers deletion of this entry, since there might be multiple threads
1649 // iterating over the _dependencies graph. Other call paths are single-threaded
1650 // and may delete it immediately.
1651 bool delete_immediately = is_alive == NULL;
1652 InstanceKlass::cast(klass)->remove_dependent_nmethod(this, delete_immediately);
1653 }
1654 }
1655 }
1656 }
1657
1658
1659 // If this oop is not live, the nmethod can be unloaded.
1660 bool nmethod::can_unload(BoolObjectClosure* is_alive, oop* root, bool unloading_occurred) {
1661 assert(root != NULL, "just checking");
1662 oop obj = *root;
1663 if (obj == NULL || is_alive->do_object_b(obj)) {
1664 return false;
1665 }
1666
1667 // If ScavengeRootsInCode is true, an nmethod might be unloaded
1668 // simply because one of its constant oops has gone dead.
1669 // No actual classes need to be unloaded in order for this to occur.
1670 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading");
1671 make_unloaded(is_alive, obj);
1672 return true;
1673 }
1674
1675 // ------------------------------------------------------------------
1676 // post_compiled_method_load_event
1677 // new method for install_code() path
1678 // Transfer information from compilation to jvmti
1679 void nmethod::post_compiled_method_load_event() {
1680
1681 Method* moop = method();
1682 #ifndef USDT2
1683 HS_DTRACE_PROBE8(hotspot, compiled__method__load,
1684 moop->klass_name()->bytes(),
1685 moop->klass_name()->utf8_length(),
1686 moop->name()->bytes(),
1687 moop->name()->utf8_length(),
1688 moop->signature()->bytes(),
1689 moop->signature()->utf8_length(),
1690 insts_begin(), insts_size());
1691 #else /* USDT2 */
1692 HOTSPOT_COMPILED_METHOD_LOAD(
1693 (char *) moop->klass_name()->bytes(),
1694 moop->klass_name()->utf8_length(),
1695 (char *) moop->name()->bytes(),
1696 moop->name()->utf8_length(),
1697 (char *) moop->signature()->bytes(),
1698 moop->signature()->utf8_length(),
1699 insts_begin(), insts_size());
1700 #endif /* USDT2 */
1701
1702 if (JvmtiExport::should_post_compiled_method_load() ||
1703 JvmtiExport::should_post_compiled_method_unload()) {
1704 get_and_cache_jmethod_id();
1705 }
1706
1707 if (JvmtiExport::should_post_compiled_method_load()) {
1708 // Let the Service thread (which is a real Java thread) post the event
1709 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1710 JvmtiDeferredEventQueue::enqueue(
1711 JvmtiDeferredEvent::compiled_method_load_event(this));
1712 }
1713 }
1714
1715 jmethodID nmethod::get_and_cache_jmethod_id() {
1716 if (_jmethod_id == NULL) {
1717 // Cache the jmethod_id since it can no longer be looked up once the
1718 // method itself has been marked for unloading.
1719 _jmethod_id = method()->jmethod_id();
1720 }
1721 return _jmethod_id;
1722 }
1723
1724 void nmethod::post_compiled_method_unload() {
1725 if (unload_reported()) {
1726 // During unloading we transition to unloaded and then to zombie
1727 // and the unloading is reported during the first transition.
1728 return;
1729 }
1730
1731 assert(_method != NULL && !is_unloaded(), "just checking");
1732 DTRACE_METHOD_UNLOAD_PROBE(method());
1733
1734 // If a JVMTI agent has enabled the CompiledMethodUnload event then
1735 // post the event. Sometime later this nmethod will be made a zombie
1736 // by the sweeper but the Method* will not be valid at that point.
1737 // If the _jmethod_id is null then no load event was ever requested
1738 // so don't bother posting the unload. The main reason for this is
1739 // that the jmethodID is a weak reference to the Method* so if
1740 // it's being unloaded there's no way to look it up since the weak
1741 // ref will have been cleared.
1742 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) {
1743 assert(!unload_reported(), "already unloaded");
1744 JvmtiDeferredEvent event =
1745 JvmtiDeferredEvent::compiled_method_unload_event(this,
1746 _jmethod_id, insts_begin());
1747 if (SafepointSynchronize::is_at_safepoint()) {
1748 // Don't want to take the queueing lock. Add it as pending and
1749 // it will get enqueued later.
1750 JvmtiDeferredEventQueue::add_pending_event(event);
1751 } else {
1752 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1753 JvmtiDeferredEventQueue::enqueue(event);
1754 }
1755 }
1756
1757 // The JVMTI CompiledMethodUnload event can be enabled or disabled at
1758 // any time. As the nmethod is being unloaded now we mark it has
1759 // having the unload event reported - this will ensure that we don't
1760 // attempt to report the event in the unlikely scenario where the
1761 // event is enabled at the time the nmethod is made a zombie.
1762 set_unload_reported();
1763 }
1764
1765 void static clean_ic_if_metadata_is_dead(CompiledIC *ic, BoolObjectClosure *is_alive, bool mark_on_stack) {
1766 if (ic->is_icholder_call()) {
1767 // The only exception is compiledICHolder oops which may
1768 // yet be marked below. (We check this further below).
1769 CompiledICHolder* cichk_oop = ic->cached_icholder();
1770
1771 if (mark_on_stack) {
1772 Metadata::mark_on_stack(cichk_oop->holder_metadata());
1773 Metadata::mark_on_stack(cichk_oop->holder_klass());
1774 }
1775
1776 if (cichk_oop->is_loader_alive(is_alive)) {
1777 return;
1778 }
1779 } else {
1780 Metadata* ic_oop = ic->cached_metadata();
1781 if (ic_oop != NULL) {
1782 if (mark_on_stack) {
1783 Metadata::mark_on_stack(ic_oop);
1784 }
1785
1786 if (ic_oop->is_klass()) {
1787 if (((Klass*)ic_oop)->is_loader_alive(is_alive)) {
1788 return;
1789 }
1790 } else if (ic_oop->is_method()) {
1791 if (((Method*)ic_oop)->method_holder()->is_loader_alive(is_alive)) {
1792 return;
1793 }
1794 } else {
1795 ShouldNotReachHere();
1796 }
1797 }
1798 }
1799
1800 ic->set_to_clean();
1801 }
1802
1803 // This is called at the end of the strong tracing/marking phase of a
1804 // GC to unload an nmethod if it contains otherwise unreachable
1805 // oops.
1806
1807 void nmethod::do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred) {
1808 // Make sure the oop's ready to receive visitors
1809 assert(!is_zombie() && !is_unloaded(),
1810 "should not call follow on zombie or unloaded nmethod");
1811
1812 // If the method is not entrant then a JMP is plastered over the
1813 // first few bytes. If an oop in the old code was there, that oop
1814 // should not get GC'd. Skip the first few bytes of oops on
1815 // not-entrant methods.
1816 address low_boundary = verified_entry_point();
1817 if (is_not_entrant()) {
1818 low_boundary += NativeJump::instruction_size;
1819 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1820 // (See comment above.)
1821 }
1822
1823 // The RedefineClasses() API can cause the class unloading invariant
1824 // to no longer be true. See jvmtiExport.hpp for details.
1825 // Also, leave a debugging breadcrumb in local flag.
1826 bool a_class_was_redefined = JvmtiExport::has_redefined_a_class();
1827 if (a_class_was_redefined) {
1828 // This set of the unloading_occurred flag is done before the
1829 // call to post_compiled_method_unload() so that the unloading
1830 // of this nmethod is reported.
1831 unloading_occurred = true;
1832 }
1833
1834 // Exception cache
1835 clean_exception_cache(is_alive);
1836
1837 // If class unloading occurred we first iterate over all inline caches and
1838 // clear ICs where the cached oop is referring to an unloaded klass or method.
1839 // The remaining live cached oops will be traversed in the relocInfo::oop_type
1840 // iteration below.
1841 if (unloading_occurred) {
1842 RelocIterator iter(this, low_boundary);
1843 while(iter.next()) {
1844 if (iter.type() == relocInfo::virtual_call_type) {
1845 CompiledIC *ic = CompiledIC_at(&iter);
1846 clean_ic_if_metadata_is_dead(ic, is_alive, false);
1847 }
1848 }
1849 }
1850
1851 // Compiled code
1852 {
1853 RelocIterator iter(this, low_boundary);
1854 while (iter.next()) {
1855 if (iter.type() == relocInfo::oop_type) {
1856 oop_Relocation* r = iter.oop_reloc();
1857 // In this loop, we must only traverse those oops directly embedded in
1858 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1859 assert(1 == (r->oop_is_immediate()) +
1860 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1861 "oop must be found in exactly one place");
1862 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1863 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) {
1864 return;
1865 }
1866 }
1867 }
1868 }
1869 }
1870
1871
1872 // Scopes
1873 for (oop* p = oops_begin(); p < oops_end(); p++) {
1874 if (oopDesc::unsafe_equals(*p, (oop) Universe::non_oop_word())) continue; // skip non-oops
1875 if (can_unload(is_alive, p, unloading_occurred)) {
1876 return;
1877 }
1878 }
1879
1880 // Ensure that all metadata is still alive
1881 verify_metadata_loaders(low_boundary, is_alive);
1882 }
1883
1884 template <class CompiledICorStaticCall>
1885 static bool clean_if_nmethod_is_unloaded(CompiledICorStaticCall *ic, address addr, BoolObjectClosure *is_alive, nmethod* from) {
1886 // Ok, to lookup references to zombies here
1887 CodeBlob *cb = CodeCache::find_blob_unsafe(addr);
1888 if (cb != NULL && cb->is_nmethod()) {
1889 nmethod* nm = (nmethod*)cb;
1890
1891 if (nm->unloading_clock() != nmethod::global_unloading_clock()) {
1892 // The nmethod has not been processed yet.
1893 return true;
1894 }
1895
1896 // Clean inline caches pointing to both zombie and not_entrant methods
1897 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1898 ic->set_to_clean();
1899 assert(ic->is_clean(), err_msg("nmethod " PTR_FORMAT "not clean %s", from, from->method()->name_and_sig_as_C_string()));
1900 }
1901 }
1902
1903 return false;
1904 }
1905
1906 static bool clean_if_nmethod_is_unloaded(CompiledIC *ic, BoolObjectClosure *is_alive, nmethod* from) {
1907 return clean_if_nmethod_is_unloaded(ic, ic->ic_destination(), is_alive, from);
1908 }
1909
1910 static bool clean_if_nmethod_is_unloaded(CompiledStaticCall *csc, BoolObjectClosure *is_alive, nmethod* from) {
1911 return clean_if_nmethod_is_unloaded(csc, csc->destination(), is_alive, from);
1912 }
1913
1914 bool nmethod::unload_if_dead_at(RelocIterator* iter_at_oop, BoolObjectClosure *is_alive, bool unloading_occurred) {
1915 assert(iter_at_oop->type() == relocInfo::oop_type, "Wrong relocation type");
1916
1917 oop_Relocation* r = iter_at_oop->oop_reloc();
1918 // Traverse those oops directly embedded in the code.
1919 // Other oops (oop_index>0) are seen as part of scopes_oops.
1920 assert(1 == (r->oop_is_immediate()) +
1921 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1922 "oop must be found in exactly one place");
1923 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1924 // Unload this nmethod if the oop is dead.
1925 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) {
1926 return true;;
1927 }
1928 }
1929
1930 return false;
1931 }
1932
1933 void nmethod::mark_metadata_on_stack_at(RelocIterator* iter_at_metadata) {
1934 assert(iter_at_metadata->type() == relocInfo::metadata_type, "Wrong relocation type");
1935
1936 metadata_Relocation* r = iter_at_metadata->metadata_reloc();
1937 // In this metadata, we must only follow those metadatas directly embedded in
1938 // the code. Other metadatas (oop_index>0) are seen as part of
1939 // the metadata section below.
1940 assert(1 == (r->metadata_is_immediate()) +
1941 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
1942 "metadata must be found in exactly one place");
1943 if (r->metadata_is_immediate() && r->metadata_value() != NULL) {
1944 Metadata* md = r->metadata_value();
1945 if (md != _method) Metadata::mark_on_stack(md);
1946 }
1947 }
1948
1949 void nmethod::mark_metadata_on_stack_non_relocs() {
1950 // Visit the metadata section
1951 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
1952 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops
1953 Metadata* md = *p;
1954 Metadata::mark_on_stack(md);
1955 }
1956
1957 // Visit metadata not embedded in the other places.
1958 if (_method != NULL) Metadata::mark_on_stack(_method);
1959 }
1960
1961 bool nmethod::do_unloading_parallel(BoolObjectClosure* is_alive, bool unloading_occurred) {
1962 ResourceMark rm;
1963
1964 // Make sure the oop's ready to receive visitors
1965 assert(!is_zombie() && !is_unloaded(),
1966 "should not call follow on zombie or unloaded nmethod");
1967
1968 // If the method is not entrant then a JMP is plastered over the
1969 // first few bytes. If an oop in the old code was there, that oop
1970 // should not get GC'd. Skip the first few bytes of oops on
1971 // not-entrant methods.
1972 address low_boundary = verified_entry_point();
1973 if (is_not_entrant()) {
1974 low_boundary += NativeJump::instruction_size;
1975 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1976 // (See comment above.)
1977 }
1978
1979 // The RedefineClasses() API can cause the class unloading invariant
1980 // to no longer be true. See jvmtiExport.hpp for details.
1981 // Also, leave a debugging breadcrumb in local flag.
1982 bool a_class_was_redefined = JvmtiExport::has_redefined_a_class();
1983 if (a_class_was_redefined) {
1984 // This set of the unloading_occurred flag is done before the
1985 // call to post_compiled_method_unload() so that the unloading
1986 // of this nmethod is reported.
1987 unloading_occurred = true;
1988 }
1989
1990 // When class redefinition is used all metadata in the CodeCache has to be recorded,
1991 // so that unused "previous versions" can be purged. Since walking the CodeCache can
1992 // be expensive, the "mark on stack" is piggy-backed on this parallel unloading code.
1993 bool mark_metadata_on_stack = a_class_was_redefined;
1994
1995 // Exception cache
1996 clean_exception_cache(is_alive);
1997
1998 bool is_unloaded = false;
1999 bool postponed = false;
2000
2001 RelocIterator iter(this, low_boundary);
2002 while(iter.next()) {
2003
2004 switch (iter.type()) {
2005
2006 case relocInfo::virtual_call_type:
2007 if (unloading_occurred) {
2008 // If class unloading occurred we first iterate over all inline caches and
2009 // clear ICs where the cached oop is referring to an unloaded klass or method.
2010 clean_ic_if_metadata_is_dead(CompiledIC_at(&iter), is_alive, mark_metadata_on_stack);
2011 }
2012
2013 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
2014 break;
2015
2016 case relocInfo::opt_virtual_call_type:
2017 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
2018 break;
2019
2020 case relocInfo::static_call_type:
2021 postponed |= clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this);
2022 break;
2023
2024 case relocInfo::oop_type:
2025 if (!is_unloaded) {
2026 is_unloaded = unload_if_dead_at(&iter, is_alive, unloading_occurred);
2027 }
2028 break;
2029
2030 case relocInfo::metadata_type:
2031 if (mark_metadata_on_stack) {
2032 mark_metadata_on_stack_at(&iter);
2033 }
2034 }
2035 }
2036
2037 if (mark_metadata_on_stack) {
2038 mark_metadata_on_stack_non_relocs();
2039 }
2040
2041 if (is_unloaded) {
2042 return postponed;
2043 }
2044
2045 // Scopes
2046 for (oop* p = oops_begin(); p < oops_end(); p++) {
2047 if (oopDesc::unsafe_equals(*p, (oop) Universe::non_oop_word())) continue; // skip non-oops
2048 if (can_unload(is_alive, p, unloading_occurred)) {
2049 is_unloaded = true;
2050 break;
2051 }
2052 }
2053
2054 if (is_unloaded) {
2055 return postponed;
2056 }
2057
2058 // Ensure that all metadata is still alive
2059 verify_metadata_loaders(low_boundary, is_alive);
2060
2061 return postponed;
2062 }
2063
2064 void nmethod::do_unloading_parallel_postponed(BoolObjectClosure* is_alive, bool unloading_occurred) {
2065 ResourceMark rm;
2066
2067 // Make sure the oop's ready to receive visitors
2068 assert(!is_zombie(),
2069 "should not call follow on zombie nmethod");
2070
2071 // If the method is not entrant then a JMP is plastered over the
2072 // first few bytes. If an oop in the old code was there, that oop
2073 // should not get GC'd. Skip the first few bytes of oops on
2074 // not-entrant methods.
2075 address low_boundary = verified_entry_point();
2076 if (is_not_entrant()) {
2077 low_boundary += NativeJump::instruction_size;
2078 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
2079 // (See comment above.)
2080 }
2081
2082 RelocIterator iter(this, low_boundary);
2083 while(iter.next()) {
2084
2085 switch (iter.type()) {
2086
2087 case relocInfo::virtual_call_type:
2088 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
2089 break;
2090
2091 case relocInfo::opt_virtual_call_type:
2092 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
2093 break;
2094
2095 case relocInfo::static_call_type:
2096 clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this);
2097 break;
2098 }
2099 }
2100 }
2101
2102 #ifdef ASSERT
2103
2104 class CheckClass : AllStatic {
2105 static BoolObjectClosure* _is_alive;
2106
2107 // Check class_loader is alive for this bit of metadata.
2108 static void check_class(Metadata* md) {
2109 Klass* klass = NULL;
2110 if (md->is_klass()) {
2111 klass = ((Klass*)md);
2112 } else if (md->is_method()) {
2113 klass = ((Method*)md)->method_holder();
2114 } else if (md->is_methodData()) {
2115 klass = ((MethodData*)md)->method()->method_holder();
2116 } else {
2117 md->print();
2118 ShouldNotReachHere();
2119 }
2120 assert(klass->is_loader_alive(_is_alive), "must be alive");
2121 }
2122 public:
2123 static void do_check_class(BoolObjectClosure* is_alive, nmethod* nm) {
2124 assert(SafepointSynchronize::is_at_safepoint(), "this is only ok at safepoint");
2125 _is_alive = is_alive;
2126 nm->metadata_do(check_class);
2127 }
2128 };
2129
2130 // This is called during a safepoint so can use static data
2131 BoolObjectClosure* CheckClass::_is_alive = NULL;
2132 #endif // ASSERT
2133
2134
2135 // Processing of oop references should have been sufficient to keep
2136 // all strong references alive. Any weak references should have been
2137 // cleared as well. Visit all the metadata and ensure that it's
2138 // really alive.
2139 void nmethod::verify_metadata_loaders(address low_boundary, BoolObjectClosure* is_alive) {
2140 #ifdef ASSERT
2141 RelocIterator iter(this, low_boundary);
2142 while (iter.next()) {
2143 // static_stub_Relocations may have dangling references to
2144 // Method*s so trim them out here. Otherwise it looks like
2145 // compiled code is maintaining a link to dead metadata.
2146 address static_call_addr = NULL;
2147 if (iter.type() == relocInfo::opt_virtual_call_type) {
2148 CompiledIC* cic = CompiledIC_at(&iter);
2149 if (!cic->is_call_to_interpreted()) {
2150 static_call_addr = iter.addr();
2151 }
2152 } else if (iter.type() == relocInfo::static_call_type) {
2153 CompiledStaticCall* csc = compiledStaticCall_at(iter.reloc());
2154 if (!csc->is_call_to_interpreted()) {
2155 static_call_addr = iter.addr();
2156 }
2157 }
2158 if (static_call_addr != NULL) {
2159 RelocIterator sciter(this, low_boundary);
2160 while (sciter.next()) {
2161 if (sciter.type() == relocInfo::static_stub_type &&
2162 sciter.static_stub_reloc()->static_call() == static_call_addr) {
2163 sciter.static_stub_reloc()->clear_inline_cache();
2164 }
2165 }
2166 }
2167 }
2168 // Check that the metadata embedded in the nmethod is alive
2169 CheckClass::do_check_class(is_alive, this);
2170 #endif
2171 }
2172
2173
2174 // Iterate over metadata calling this function. Used by RedefineClasses
2175 void nmethod::metadata_do(void f(Metadata*)) {
2176 address low_boundary = verified_entry_point();
2177 if (is_not_entrant()) {
2178 low_boundary += NativeJump::instruction_size;
2179 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
2180 // (See comment above.)
2181 }
2182 {
2183 // Visit all immediate references that are embedded in the instruction stream.
2184 RelocIterator iter(this, low_boundary);
2185 while (iter.next()) {
2186 if (iter.type() == relocInfo::metadata_type ) {
2187 metadata_Relocation* r = iter.metadata_reloc();
2188 // In this metadata, we must only follow those metadatas directly embedded in
2189 // the code. Other metadatas (oop_index>0) are seen as part of
2190 // the metadata section below.
2191 assert(1 == (r->metadata_is_immediate()) +
2192 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
2193 "metadata must be found in exactly one place");
2194 if (r->metadata_is_immediate() && r->metadata_value() != NULL) {
2195 Metadata* md = r->metadata_value();
2196 if (md != _method) f(md);
2197 }
2198 } else if (iter.type() == relocInfo::virtual_call_type) {
2199 // Check compiledIC holders associated with this nmethod
2200 CompiledIC *ic = CompiledIC_at(&iter);
2201 if (ic->is_icholder_call()) {
2202 CompiledICHolder* cichk = ic->cached_icholder();
2203 f(cichk->holder_metadata());
2204 f(cichk->holder_klass());
2205 } else {
2206 Metadata* ic_oop = ic->cached_metadata();
2207 if (ic_oop != NULL) {
2208 f(ic_oop);
2209 }
2210 }
2211 }
2212 }
2213 }
2214
2215 // Visit the metadata section
2216 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
2217 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops
2218 Metadata* md = *p;
2219 f(md);
2220 }
2221
2222 // Call function Method*, not embedded in these other places.
2223 if (_method != NULL) f(_method);
2224 }
2225
2226 void nmethod::oops_do(OopClosure* f, bool allow_zombie) {
2227 // make sure the oops ready to receive visitors
2228 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod");
2229 assert(!is_unloaded(), "should not call follow on unloaded nmethod");
2230
2231 // If the method is not entrant or zombie then a JMP is plastered over the
2232 // first few bytes. If an oop in the old code was there, that oop
2233 // should not get GC'd. Skip the first few bytes of oops on
2234 // not-entrant methods.
2235 address low_boundary = verified_entry_point();
2236 if (is_not_entrant()) {
2237 low_boundary += NativeJump::instruction_size;
2238 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
2239 // (See comment above.)
2240 }
2241
2242 RelocIterator iter(this, low_boundary);
2243
2244 while (iter.next()) {
2245 if (iter.type() == relocInfo::oop_type ) {
2246 oop_Relocation* r = iter.oop_reloc();
2247 // In this loop, we must only follow those oops directly embedded in
2248 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
2249 assert(1 == (r->oop_is_immediate()) +
2250 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
2251 "oop must be found in exactly one place");
2252 if (r->oop_is_immediate() && r->oop_value() != NULL) {
2253 f->do_oop(r->oop_addr());
2254 }
2255 }
2256 }
2257
2258 // Scopes
2259 // This includes oop constants not inlined in the code stream.
2260 for (oop* p = oops_begin(); p < oops_end(); p++) {
2261 if (oopDesc::unsafe_equals(*p, (oop) Universe::non_oop_word())) continue; // skip non-oops
2262 f->do_oop(p);
2263 }
2264 }
2265
2266 #define NMETHOD_SENTINEL ((nmethod*)badAddress)
2267
2268 nmethod* volatile nmethod::_oops_do_mark_nmethods;
2269
2270 // An nmethod is "marked" if its _mark_link is set non-null.
2271 // Even if it is the end of the linked list, it will have a non-null link value,
2272 // as long as it is on the list.
2273 // This code must be MP safe, because it is used from parallel GC passes.
2274 bool nmethod::test_set_oops_do_mark() {
2275 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");
2276 nmethod* observed_mark_link = _oops_do_mark_link;
2277 if (observed_mark_link == NULL) {
2278 // Claim this nmethod for this thread to mark.
2279 observed_mark_link = (nmethod*)
2280 Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_link, NULL);
2281 if (observed_mark_link == NULL) {
2282
2283 // Atomically append this nmethod (now claimed) to the head of the list:
2284 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods;
2285 for (;;) {
2286 nmethod* required_mark_nmethods = observed_mark_nmethods;
2287 _oops_do_mark_link = required_mark_nmethods;
2288 observed_mark_nmethods = (nmethod*)
2289 Atomic::cmpxchg_ptr(this, &_oops_do_mark_nmethods, required_mark_nmethods);
2290 if (observed_mark_nmethods == required_mark_nmethods)
2291 break;
2292 }
2293 // Mark was clear when we first saw this guy.
2294 NOT_PRODUCT(if (TraceScavenge) print_on(tty, "oops_do, mark"));
2295 return false;
2296 }
2297 }
2298 // On fall through, another racing thread marked this nmethod before we did.
2299 return true;
2300 }
2301
2302 void nmethod::oops_do_marking_prologue() {
2303 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("[oops_do_marking_prologue"));
2304 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row");
2305 // We use cmpxchg_ptr instead of regular assignment here because the user
2306 // may fork a bunch of threads, and we need them all to see the same state.
2307 void* observed = Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, NULL);
2308 guarantee(observed == NULL, "no races in this sequential code");
2309 }
2310
2311 void nmethod::oops_do_marking_epilogue() {
2312 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row");
2313 nmethod* cur = _oops_do_mark_nmethods;
2314 while (cur != NMETHOD_SENTINEL) {
2315 assert(cur != NULL, "not NULL-terminated");
2316 nmethod* next = cur->_oops_do_mark_link;
2317 cur->_oops_do_mark_link = NULL;
2318 DEBUG_ONLY(cur->verify_oop_relocations());
2319 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark"));
2320 cur = next;
2321 }
2322 void* required = _oops_do_mark_nmethods;
2323 void* observed = Atomic::cmpxchg_ptr(NULL, &_oops_do_mark_nmethods, required);
2324 guarantee(observed == required, "no races in this sequential code");
2325 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("oops_do_marking_epilogue]"));
2326 }
2327
2328 class DetectScavengeRoot: public OopClosure {
2329 bool _detected_scavenge_root;
2330 public:
2331 DetectScavengeRoot() : _detected_scavenge_root(false)
2332 { NOT_PRODUCT(_print_nm = NULL); }
2333 bool detected_scavenge_root() { return _detected_scavenge_root; }
2334 virtual void do_oop(oop* p) {
2335 if ((*p) != NULL && (*p)->is_scavengable()) {
2336 NOT_PRODUCT(maybe_print(p));
2337 _detected_scavenge_root = true;
2338 }
2339 }
2340 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2341
2342 #ifndef PRODUCT
2343 nmethod* _print_nm;
2344 void maybe_print(oop* p) {
2345 if (_print_nm == NULL) return;
2346 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root");
2347 tty->print_cr(""PTR_FORMAT"[offset=%d] detected scavengable oop "PTR_FORMAT" (found at "PTR_FORMAT")",
2348 _print_nm, (int)((intptr_t)p - (intptr_t)_print_nm),
2349 (void *)(*p), (intptr_t)p);
2350 (*p)->print();
2351 }
2352 #endif //PRODUCT
2353 };
2354
2355 bool nmethod::detect_scavenge_root_oops() {
2356 DetectScavengeRoot detect_scavenge_root;
2357 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this);
2358 oops_do(&detect_scavenge_root);
2359 return detect_scavenge_root.detected_scavenge_root();
2360 }
2361
2362 // Method that knows how to preserve outgoing arguments at call. This method must be
2363 // called with a frame corresponding to a Java invoke
2364 void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) {
2365 #ifndef SHARK
2366 if (!method()->is_native()) {
2367 SimpleScopeDesc ssd(this, fr.pc());
2368 Bytecode_invoke call(ssd.method(), ssd.bci());
2369 bool has_receiver = call.has_receiver();
2370 bool has_appendix = call.has_appendix();
2371 Symbol* signature = call.signature();
2372 fr.oops_compiled_arguments_do(signature, has_receiver, has_appendix, reg_map, f);
2373 }
2374 #endif // !SHARK
2375 }
2376
2377
2378 oop nmethod::embeddedOop_at(u_char* p) {
2379 RelocIterator iter(this, p, p + 1);
2380 while (iter.next())
2381 if (iter.type() == relocInfo::oop_type) {
2382 return iter.oop_reloc()->oop_value();
2383 }
2384 return NULL;
2385 }
2386
2387
2388 inline bool includes(void* p, void* from, void* to) {
2389 return from <= p && p < to;
2390 }
2391
2392
2393 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
2394 assert(count >= 2, "must be sentinel values, at least");
2395
2396 #ifdef ASSERT
2397 // must be sorted and unique; we do a binary search in find_pc_desc()
2398 int prev_offset = pcs[0].pc_offset();
2399 assert(prev_offset == PcDesc::lower_offset_limit,
2400 "must start with a sentinel");
2401 for (int i = 1; i < count; i++) {
2402 int this_offset = pcs[i].pc_offset();
2403 assert(this_offset > prev_offset, "offsets must be sorted");
2404 prev_offset = this_offset;
2405 }
2406 assert(prev_offset == PcDesc::upper_offset_limit,
2407 "must end with a sentinel");
2408 #endif //ASSERT
2409
2410 // Search for MethodHandle invokes and tag the nmethod.
2411 for (int i = 0; i < count; i++) {
2412 if (pcs[i].is_method_handle_invoke()) {
2413 set_has_method_handle_invokes(true);
2414 break;
2415 }
2416 }
2417 assert(has_method_handle_invokes() == (_deoptimize_mh_offset != -1), "must have deopt mh handler");
2418
2419 int size = count * sizeof(PcDesc);
2420 assert(scopes_pcs_size() >= size, "oob");
2421 memcpy(scopes_pcs_begin(), pcs, size);
2422
2423 // Adjust the final sentinel downward.
2424 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
2425 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
2426 last_pc->set_pc_offset(content_size() + 1);
2427 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
2428 // Fill any rounding gaps with copies of the last record.
2429 last_pc[1] = last_pc[0];
2430 }
2431 // The following assert could fail if sizeof(PcDesc) is not
2432 // an integral multiple of oopSize (the rounding term).
2433 // If it fails, change the logic to always allocate a multiple
2434 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
2435 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
2436 }
2437
2438 void nmethod::copy_scopes_data(u_char* buffer, int size) {
2439 assert(scopes_data_size() >= size, "oob");
2440 memcpy(scopes_data_begin(), buffer, size);
2441 }
2442
2443
2444 #ifdef ASSERT
2445 static PcDesc* linear_search(nmethod* nm, int pc_offset, bool approximate) {
2446 PcDesc* lower = nm->scopes_pcs_begin();
2447 PcDesc* upper = nm->scopes_pcs_end();
2448 lower += 1; // exclude initial sentinel
2449 PcDesc* res = NULL;
2450 for (PcDesc* p = lower; p < upper; p++) {
2451 NOT_PRODUCT(--nmethod_stats.pc_desc_tests); // don't count this call to match_desc
2452 if (match_desc(p, pc_offset, approximate)) {
2453 if (res == NULL)
2454 res = p;
2455 else
2456 res = (PcDesc*) badAddress;
2457 }
2458 }
2459 return res;
2460 }
2461 #endif
2462
2463
2464 // Finds a PcDesc with real-pc equal to "pc"
2465 PcDesc* nmethod::find_pc_desc_internal(address pc, bool approximate) {
2466 address base_address = code_begin();
2467 if ((pc < base_address) ||
2468 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
2469 return NULL; // PC is wildly out of range
2470 }
2471 int pc_offset = (int) (pc - base_address);
2472
2473 // Check the PcDesc cache if it contains the desired PcDesc
2474 // (This as an almost 100% hit rate.)
2475 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
2476 if (res != NULL) {
2477 assert(res == linear_search(this, pc_offset, approximate), "cache ok");
2478 return res;
2479 }
2480
2481 // Fallback algorithm: quasi-linear search for the PcDesc
2482 // Find the last pc_offset less than the given offset.
2483 // The successor must be the required match, if there is a match at all.
2484 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
2485 PcDesc* lower = scopes_pcs_begin();
2486 PcDesc* upper = scopes_pcs_end();
2487 upper -= 1; // exclude final sentinel
2488 if (lower >= upper) return NULL; // native method; no PcDescs at all
2489
2490 #define assert_LU_OK \
2491 /* invariant on lower..upper during the following search: */ \
2492 assert(lower->pc_offset() < pc_offset, "sanity"); \
2493 assert(upper->pc_offset() >= pc_offset, "sanity")
2494 assert_LU_OK;
2495
2496 // Use the last successful return as a split point.
2497 PcDesc* mid = _pc_desc_cache.last_pc_desc();
2498 NOT_PRODUCT(++nmethod_stats.pc_desc_searches);
2499 if (mid->pc_offset() < pc_offset) {
2500 lower = mid;
2501 } else {
2502 upper = mid;
2503 }
2504
2505 // Take giant steps at first (4096, then 256, then 16, then 1)
2506 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
2507 const int RADIX = (1 << LOG2_RADIX);
2508 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
2509 while ((mid = lower + step) < upper) {
2510 assert_LU_OK;
2511 NOT_PRODUCT(++nmethod_stats.pc_desc_searches);
2512 if (mid->pc_offset() < pc_offset) {
2513 lower = mid;
2514 } else {
2515 upper = mid;
2516 break;
2517 }
2518 }
2519 assert_LU_OK;
2520 }
2521
2522 // Sneak up on the value with a linear search of length ~16.
2523 while (true) {
2524 assert_LU_OK;
2525 mid = lower + 1;
2526 NOT_PRODUCT(++nmethod_stats.pc_desc_searches);
2527 if (mid->pc_offset() < pc_offset) {
2528 lower = mid;
2529 } else {
2530 upper = mid;
2531 break;
2532 }
2533 }
2534 #undef assert_LU_OK
2535
2536 if (match_desc(upper, pc_offset, approximate)) {
2537 assert(upper == linear_search(this, pc_offset, approximate), "search ok");
2538 _pc_desc_cache.add_pc_desc(upper);
2539 return upper;
2540 } else {
2541 assert(NULL == linear_search(this, pc_offset, approximate), "search ok");
2542 return NULL;
2543 }
2544 }
2545
2546
2547 bool nmethod::check_all_dependencies() {
2548 bool found_check = false;
2549 // wholesale check of all dependencies
2550 for (Dependencies::DepStream deps(this); deps.next(); ) {
2551 if (deps.check_dependency() != NULL) {
2552 found_check = true;
2553 NOT_DEBUG(break);
2554 }
2555 }
2556 return found_check; // tell caller if we found anything
2557 }
2558
2559 bool nmethod::check_dependency_on(DepChange& changes) {
2560 // What has happened:
2561 // 1) a new class dependee has been added
2562 // 2) dependee and all its super classes have been marked
2563 bool found_check = false; // set true if we are upset
2564 for (Dependencies::DepStream deps(this); deps.next(); ) {
2565 // Evaluate only relevant dependencies.
2566 if (deps.spot_check_dependency_at(changes) != NULL) {
2567 found_check = true;
2568 NOT_DEBUG(break);
2569 }
2570 }
2571 return found_check;
2572 }
2573
2574 bool nmethod::is_evol_dependent_on(Klass* dependee) {
2575 InstanceKlass *dependee_ik = InstanceKlass::cast(dependee);
2576 Array<Method*>* dependee_methods = dependee_ik->methods();
2577 for (Dependencies::DepStream deps(this); deps.next(); ) {
2578 if (deps.type() == Dependencies::evol_method) {
2579 Method* method = deps.method_argument(0);
2580 for (int j = 0; j < dependee_methods->length(); j++) {
2581 if (dependee_methods->at(j) == method) {
2582 // RC_TRACE macro has an embedded ResourceMark
2583 RC_TRACE(0x01000000,
2584 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)",
2585 _method->method_holder()->external_name(),
2586 _method->name()->as_C_string(),
2587 _method->signature()->as_C_string(), compile_id(),
2588 method->method_holder()->external_name(),
2589 method->name()->as_C_string(),
2590 method->signature()->as_C_string()));
2591 if (TraceDependencies || LogCompilation)
2592 deps.log_dependency(dependee);
2593 return true;
2594 }
2595 }
2596 }
2597 }
2598 return false;
2599 }
2600
2601 // Called from mark_for_deoptimization, when dependee is invalidated.
2602 bool nmethod::is_dependent_on_method(Method* dependee) {
2603 for (Dependencies::DepStream deps(this); deps.next(); ) {
2604 if (deps.type() != Dependencies::evol_method)
2605 continue;
2606 Method* method = deps.method_argument(0);
2607 if (method == dependee) return true;
2608 }
2609 return false;
2610 }
2611
2612
2613 bool nmethod::is_patchable_at(address instr_addr) {
2614 assert(insts_contains(instr_addr), "wrong nmethod used");
2615 if (is_zombie()) {
2616 // a zombie may never be patched
2617 return false;
2618 }
2619 return true;
2620 }
2621
2622
2623 address nmethod::continuation_for_implicit_exception(address pc) {
2624 // Exception happened outside inline-cache check code => we are inside
2625 // an active nmethod => use cpc to determine a return address
2626 int exception_offset = pc - code_begin();
2627 int cont_offset = ImplicitExceptionTable(this).at( exception_offset );
2628 #ifdef ASSERT
2629 if (cont_offset == 0) {
2630 Thread* thread = ThreadLocalStorage::get_thread_slow();
2631 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
2632 HandleMark hm(thread);
2633 ResourceMark rm(thread);
2634 CodeBlob* cb = CodeCache::find_blob(pc);
2635 assert(cb != NULL && cb == this, "");
2636 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, pc);
2637 print();
2638 method()->print_codes();
2639 print_code();
2640 print_pcs();
2641 }
2642 #endif
2643 if (cont_offset == 0) {
2644 // Let the normal error handling report the exception
2645 return NULL;
2646 }
2647 return code_begin() + cont_offset;
2648 }
2649
2650
2651
2652 void nmethod_init() {
2653 // make sure you didn't forget to adjust the filler fields
2654 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
2655 }
2656
2657
2658 //-------------------------------------------------------------------------------------------
2659
2660
2661 // QQQ might we make this work from a frame??
2662 nmethodLocker::nmethodLocker(address pc) {
2663 CodeBlob* cb = CodeCache::find_blob(pc);
2664 guarantee(cb != NULL && cb->is_nmethod(), "bad pc for a nmethod found");
2665 _nm = (nmethod*)cb;
2666 lock_nmethod(_nm);
2667 }
2668
2669 // Only JvmtiDeferredEvent::compiled_method_unload_event()
2670 // should pass zombie_ok == true.
2671 void nmethodLocker::lock_nmethod(nmethod* nm, bool zombie_ok) {
2672 if (nm == NULL) return;
2673 Atomic::inc(&nm->_lock_count);
2674 guarantee(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method");
2675 }
2676
2677 void nmethodLocker::unlock_nmethod(nmethod* nm) {
2678 if (nm == NULL) return;
2679 Atomic::dec(&nm->_lock_count);
2680 guarantee(nm->_lock_count >= 0, "unmatched nmethod lock/unlock");
2681 }
2682
2683
2684 // -----------------------------------------------------------------------------
2685 // nmethod::get_deopt_original_pc
2686 //
2687 // Return the original PC for the given PC if:
2688 // (a) the given PC belongs to a nmethod and
2689 // (b) it is a deopt PC
2690 address nmethod::get_deopt_original_pc(const frame* fr) {
2691 if (fr->cb() == NULL) return NULL;
2692
2693 nmethod* nm = fr->cb()->as_nmethod_or_null();
2694 if (nm != NULL && nm->is_deopt_pc(fr->pc()))
2695 return nm->get_original_pc(fr);
2696
2697 return NULL;
2698 }
2699
2700
2701 // -----------------------------------------------------------------------------
2702 // MethodHandle
2703
2704 bool nmethod::is_method_handle_return(address return_pc) {
2705 if (!has_method_handle_invokes()) return false;
2706 PcDesc* pd = pc_desc_at(return_pc);
2707 if (pd == NULL)
2708 return false;
2709 return pd->is_method_handle_invoke();
2710 }
2711
2712
2713 // -----------------------------------------------------------------------------
2714 // Verification
2715
2716 class VerifyOopsClosure: public OopClosure {
2717 nmethod* _nm;
2718 bool _ok;
2719 public:
2720 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
2721 bool ok() { return _ok; }
2722 virtual void do_oop(oop* p) {
2723 if ((*p) == NULL || (*p)->is_oop()) return;
2724 if (_ok) {
2725 _nm->print_nmethod(true);
2726 _ok = false;
2727 }
2728 tty->print_cr("*** non-oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)",
2729 (void *)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm));
2730 }
2731 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2732 };
2733
2734 void nmethod::verify() {
2735
2736 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant
2737 // seems odd.
2738
2739 if (is_zombie() || is_not_entrant() || is_unloaded())
2740 return;
2741
2742 // Make sure all the entry points are correctly aligned for patching.
2743 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
2744
2745 // assert(method()->is_oop(), "must be valid");
2746
2747 ResourceMark rm;
2748
2749 if (!CodeCache::contains(this)) {
2750 fatal(err_msg("nmethod at " INTPTR_FORMAT " not in zone", this));
2751 }
2752
2753 if(is_native_method() )
2754 return;
2755
2756 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
2757 if (nm != this) {
2758 fatal(err_msg("findNMethod did not find this nmethod (" INTPTR_FORMAT ")",
2759 this));
2760 }
2761
2762 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2763 if (! p->verify(this)) {
2764 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", this);
2765 }
2766 }
2767
2768 VerifyOopsClosure voc(this);
2769 oops_do(&voc);
2770 assert(voc.ok(), "embedded oops must be OK");
2771 verify_scavenge_root_oops();
2772
2773 verify_scopes();
2774 }
2775
2776
2777 void nmethod::verify_interrupt_point(address call_site) {
2778 // Verify IC only when nmethod installation is finished.
2779 bool is_installed = (method()->code() == this) // nmethod is in state 'in_use' and installed
2780 || !this->is_in_use(); // nmethod is installed, but not in 'in_use' state
2781 if (is_installed) {
2782 Thread *cur = Thread::current();
2783 if (CompiledIC_lock->owner() == cur ||
2784 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) &&
2785 SafepointSynchronize::is_at_safepoint())) {
2786 CompiledIC_at(this, call_site);
2787 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
2788 } else {
2789 MutexLocker ml_verify (CompiledIC_lock);
2790 CompiledIC_at(this, call_site);
2791 }
2792 }
2793
2794 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address());
2795 assert(pd != NULL, "PcDesc must exist");
2796 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(),
2797 pd->obj_decode_offset(), pd->should_reexecute(),
2798 pd->return_oop());
2799 !sd->is_top(); sd = sd->sender()) {
2800 sd->verify();
2801 }
2802 }
2803
2804 void nmethod::verify_scopes() {
2805 if( !method() ) return; // Runtime stubs have no scope
2806 if (method()->is_native()) return; // Ignore stub methods.
2807 // iterate through all interrupt point
2808 // and verify the debug information is valid.
2809 RelocIterator iter((nmethod*)this);
2810 while (iter.next()) {
2811 address stub = NULL;
2812 switch (iter.type()) {
2813 case relocInfo::virtual_call_type:
2814 verify_interrupt_point(iter.addr());
2815 break;
2816 case relocInfo::opt_virtual_call_type:
2817 stub = iter.opt_virtual_call_reloc()->static_stub();
2818 verify_interrupt_point(iter.addr());
2819 break;
2820 case relocInfo::static_call_type:
2821 stub = iter.static_call_reloc()->static_stub();
2822 //verify_interrupt_point(iter.addr());
2823 break;
2824 case relocInfo::runtime_call_type:
2825 address destination = iter.reloc()->value();
2826 // Right now there is no way to find out which entries support
2827 // an interrupt point. It would be nice if we had this
2828 // information in a table.
2829 break;
2830 }
2831 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section");
2832 }
2833 }
2834
2835
2836 // -----------------------------------------------------------------------------
2837 // Non-product code
2838 #ifndef PRODUCT
2839
2840 class DebugScavengeRoot: public OopClosure {
2841 nmethod* _nm;
2842 bool _ok;
2843 public:
2844 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { }
2845 bool ok() { return _ok; }
2846 virtual void do_oop(oop* p) {
2847 if ((*p) == NULL || !(*p)->is_scavengable()) return;
2848 if (_ok) {
2849 _nm->print_nmethod(true);
2850 _ok = false;
2851 }
2852 tty->print_cr("*** scavengable oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)",
2853 (void *)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm));
2854 (*p)->print();
2855 }
2856 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2857 };
2858
2859 void nmethod::verify_scavenge_root_oops() {
2860 if (UseG1GC || UseShenandoahGC) {
2861 return;
2862 }
2863
2864 if (!on_scavenge_root_list()) {
2865 // Actually look inside, to verify the claim that it's clean.
2866 DebugScavengeRoot debug_scavenge_root(this);
2867 oops_do(&debug_scavenge_root);
2868 if (!debug_scavenge_root.ok())
2869 fatal("found an unadvertised bad scavengable oop in the code cache");
2870 }
2871 assert(scavenge_root_not_marked(), "");
2872 }
2873
2874 #endif // PRODUCT
2875
2876 // Printing operations
2877
2878 void nmethod::print() const {
2879 ResourceMark rm;
2880 ttyLocker ttyl; // keep the following output all in one block
2881
2882 tty->print("Compiled method ");
2883
2884 if (is_compiled_by_c1()) {
2885 tty->print("(c1) ");
2886 } else if (is_compiled_by_c2()) {
2887 tty->print("(c2) ");
2888 } else if (is_compiled_by_shark()) {
2889 tty->print("(shark) ");
2890 } else {
2891 tty->print("(nm) ");
2892 }
2893
2894 print_on(tty, NULL);
2895
2896 if (WizardMode) {
2897 tty->print("((nmethod*) "INTPTR_FORMAT ") ", this);
2898 tty->print(" for method " INTPTR_FORMAT , (address)method());
2899 tty->print(" { ");
2900 if (is_in_use()) tty->print("in_use ");
2901 if (is_not_entrant()) tty->print("not_entrant ");
2902 if (is_zombie()) tty->print("zombie ");
2903 if (is_unloaded()) tty->print("unloaded ");
2904 if (on_scavenge_root_list()) tty->print("scavenge_root ");
2905 tty->print_cr("}:");
2906 }
2907 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2908 (address)this,
2909 (address)this + size(),
2910 size());
2911 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2912 relocation_begin(),
2913 relocation_end(),
2914 relocation_size());
2915 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2916 consts_begin(),
2917 consts_end(),
2918 consts_size());
2919 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2920 insts_begin(),
2921 insts_end(),
2922 insts_size());
2923 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2924 stub_begin(),
2925 stub_end(),
2926 stub_size());
2927 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2928 oops_begin(),
2929 oops_end(),
2930 oops_size());
2931 if (metadata_size () > 0) tty->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2932 metadata_begin(),
2933 metadata_end(),
2934 metadata_size());
2935 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2936 scopes_data_begin(),
2937 scopes_data_end(),
2938 scopes_data_size());
2939 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2940 scopes_pcs_begin(),
2941 scopes_pcs_end(),
2942 scopes_pcs_size());
2943 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2944 dependencies_begin(),
2945 dependencies_end(),
2946 dependencies_size());
2947 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2948 handler_table_begin(),
2949 handler_table_end(),
2950 handler_table_size());
2951 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2952 nul_chk_table_begin(),
2953 nul_chk_table_end(),
2954 nul_chk_table_size());
2955 }
2956
2957 void nmethod::print_code() {
2958 HandleMark hm;
2959 ResourceMark m;
2960 Disassembler::decode(this);
2961 }
2962
2963
2964 #ifndef PRODUCT
2965
2966 void nmethod::print_scopes() {
2967 // Find the first pc desc for all scopes in the code and print it.
2968 ResourceMark rm;
2969 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2970 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
2971 continue;
2972
2973 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
2974 sd->print_on(tty, p);
2975 }
2976 }
2977
2978 void nmethod::print_dependencies() {
2979 ResourceMark rm;
2980 ttyLocker ttyl; // keep the following output all in one block
2981 tty->print_cr("Dependencies:");
2982 for (Dependencies::DepStream deps(this); deps.next(); ) {
2983 deps.print_dependency();
2984 Klass* ctxk = deps.context_type();
2985 if (ctxk != NULL) {
2986 if (ctxk->oop_is_instance() && ((InstanceKlass*)ctxk)->is_dependent_nmethod(this)) {
2987 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name());
2988 }
2989 }
2990 deps.log_dependency(); // put it into the xml log also
2991 }
2992 }
2993
2994
2995 void nmethod::print_relocations() {
2996 ResourceMark m; // in case methods get printed via the debugger
2997 tty->print_cr("relocations:");
2998 RelocIterator iter(this);
2999 iter.print();
3000 if (UseRelocIndex) {
3001 jint* index_end = (jint*)relocation_end() - 1;
3002 jint index_size = *index_end;
3003 jint* index_start = (jint*)( (address)index_end - index_size );
3004 tty->print_cr(" index @" INTPTR_FORMAT ": index_size=%d", index_start, index_size);
3005 if (index_size > 0) {
3006 jint* ip;
3007 for (ip = index_start; ip+2 <= index_end; ip += 2)
3008 tty->print_cr(" (%d %d) addr=" INTPTR_FORMAT " @" INTPTR_FORMAT,
3009 ip[0],
3010 ip[1],
3011 header_end()+ip[0],
3012 relocation_begin()-1+ip[1]);
3013 for (; ip < index_end; ip++)
3014 tty->print_cr(" (%d ?)", ip[0]);
3015 tty->print_cr(" @" INTPTR_FORMAT ": index_size=%d", ip, *ip);
3016 ip++;
3017 tty->print_cr("reloc_end @" INTPTR_FORMAT ":", ip);
3018 }
3019 }
3020 }
3021
3022
3023 void nmethod::print_pcs() {
3024 ResourceMark m; // in case methods get printed via debugger
3025 tty->print_cr("pc-bytecode offsets:");
3026 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
3027 p->print(this);
3028 }
3029 }
3030
3031 #endif // PRODUCT
3032
3033 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
3034 RelocIterator iter(this, begin, end);
3035 bool have_one = false;
3036 while (iter.next()) {
3037 have_one = true;
3038 switch (iter.type()) {
3039 case relocInfo::none: return "no_reloc";
3040 case relocInfo::oop_type: {
3041 stringStream st;
3042 oop_Relocation* r = iter.oop_reloc();
3043 oop obj = r->oop_value();
3044 st.print("oop(");
3045 if (obj == NULL) st.print("NULL");
3046 else obj->print_value_on(&st);
3047 st.print(")");
3048 return st.as_string();
3049 }
3050 case relocInfo::metadata_type: {
3051 stringStream st;
3052 metadata_Relocation* r = iter.metadata_reloc();
3053 Metadata* obj = r->metadata_value();
3054 st.print("metadata(");
3055 if (obj == NULL) st.print("NULL");
3056 else obj->print_value_on(&st);
3057 st.print(")");
3058 return st.as_string();
3059 }
3060 case relocInfo::virtual_call_type: return "virtual_call";
3061 case relocInfo::opt_virtual_call_type: return "optimized virtual_call";
3062 case relocInfo::static_call_type: return "static_call";
3063 case relocInfo::static_stub_type: return "static_stub";
3064 case relocInfo::runtime_call_type: return "runtime_call";
3065 case relocInfo::external_word_type: return "external_word";
3066 case relocInfo::internal_word_type: return "internal_word";
3067 case relocInfo::section_word_type: return "section_word";
3068 case relocInfo::poll_type: return "poll";
3069 case relocInfo::poll_return_type: return "poll_return";
3070 case relocInfo::type_mask: return "type_bit_mask";
3071 }
3072 }
3073 return have_one ? "other" : NULL;
3074 }
3075
3076 // Return a the last scope in (begin..end]
3077 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
3078 PcDesc* p = pc_desc_near(begin+1);
3079 if (p != NULL && p->real_pc(this) <= end) {
3080 return new ScopeDesc(this, p->scope_decode_offset(),
3081 p->obj_decode_offset(), p->should_reexecute(),
3082 p->return_oop());
3083 }
3084 return NULL;
3085 }
3086
3087 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const {
3088 if (block_begin == entry_point()) stream->print_cr("[Entry Point]");
3089 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]");
3090 if (block_begin == exception_begin()) stream->print_cr("[Exception Handler]");
3091 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]");
3092 if (block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]");
3093
3094 if (has_method_handle_invokes())
3095 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]");
3096
3097 if (block_begin == consts_begin()) stream->print_cr("[Constants]");
3098
3099 if (block_begin == entry_point()) {
3100 methodHandle m = method();
3101 if (m.not_null()) {
3102 stream->print(" # ");
3103 m->print_value_on(stream);
3104 stream->cr();
3105 }
3106 if (m.not_null() && !is_osr_method()) {
3107 ResourceMark rm;
3108 int sizeargs = m->size_of_parameters();
3109 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
3110 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
3111 {
3112 int sig_index = 0;
3113 if (!m->is_static())
3114 sig_bt[sig_index++] = T_OBJECT; // 'this'
3115 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) {
3116 BasicType t = ss.type();
3117 sig_bt[sig_index++] = t;
3118 if (type2size[t] == 2) {
3119 sig_bt[sig_index++] = T_VOID;
3120 } else {
3121 assert(type2size[t] == 1, "size is 1 or 2");
3122 }
3123 }
3124 assert(sig_index == sizeargs, "");
3125 }
3126 const char* spname = "sp"; // make arch-specific?
3127 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false);
3128 int stack_slot_offset = this->frame_size() * wordSize;
3129 int tab1 = 14, tab2 = 24;
3130 int sig_index = 0;
3131 int arg_index = (m->is_static() ? 0 : -1);
3132 bool did_old_sp = false;
3133 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) {
3134 bool at_this = (arg_index == -1);
3135 bool at_old_sp = false;
3136 BasicType t = (at_this ? T_OBJECT : ss.type());
3137 assert(t == sig_bt[sig_index], "sigs in sync");
3138 if (at_this)
3139 stream->print(" # this: ");
3140 else
3141 stream->print(" # parm%d: ", arg_index);
3142 stream->move_to(tab1);
3143 VMReg fst = regs[sig_index].first();
3144 VMReg snd = regs[sig_index].second();
3145 if (fst->is_reg()) {
3146 stream->print("%s", fst->name());
3147 if (snd->is_valid()) {
3148 stream->print(":%s", snd->name());
3149 }
3150 } else if (fst->is_stack()) {
3151 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
3152 if (offset == stack_slot_offset) at_old_sp = true;
3153 stream->print("[%s+0x%x]", spname, offset);
3154 } else {
3155 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
3156 }
3157 stream->print(" ");
3158 stream->move_to(tab2);
3159 stream->print("= ");
3160 if (at_this) {
3161 m->method_holder()->print_value_on(stream);
3162 } else {
3163 bool did_name = false;
3164 if (!at_this && ss.is_object()) {
3165 Symbol* name = ss.as_symbol_or_null();
3166 if (name != NULL) {
3167 name->print_value_on(stream);
3168 did_name = true;
3169 }
3170 }
3171 if (!did_name)
3172 stream->print("%s", type2name(t));
3173 }
3174 if (at_old_sp) {
3175 stream->print(" (%s of caller)", spname);
3176 did_old_sp = true;
3177 }
3178 stream->cr();
3179 sig_index += type2size[t];
3180 arg_index += 1;
3181 if (!at_this) ss.next();
3182 }
3183 if (!did_old_sp) {
3184 stream->print(" # ");
3185 stream->move_to(tab1);
3186 stream->print("[%s+0x%x]", spname, stack_slot_offset);
3187 stream->print(" (%s of caller)", spname);
3188 stream->cr();
3189 }
3190 }
3191 }
3192 }
3193
3194 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) {
3195 // First, find an oopmap in (begin, end].
3196 // We use the odd half-closed interval so that oop maps and scope descs
3197 // which are tied to the byte after a call are printed with the call itself.
3198 address base = code_begin();
3199 OopMapSet* oms = oop_maps();
3200 if (oms != NULL) {
3201 for (int i = 0, imax = oms->size(); i < imax; i++) {
3202 OopMap* om = oms->at(i);
3203 address pc = base + om->offset();
3204 if (pc > begin) {
3205 if (pc <= end) {
3206 st->move_to(column);
3207 st->print("; ");
3208 om->print_on(st);
3209 }
3210 break;
3211 }
3212 }
3213 }
3214
3215 // Print any debug info present at this pc.
3216 ScopeDesc* sd = scope_desc_in(begin, end);
3217 if (sd != NULL) {
3218 st->move_to(column);
3219 if (sd->bci() == SynchronizationEntryBCI) {
3220 st->print(";*synchronization entry");
3221 } else {
3222 if (sd->method() == NULL) {
3223 st->print("method is NULL");
3224 } else if (sd->method()->is_native()) {
3225 st->print("method is native");
3226 } else {
3227 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci());
3228 st->print(";*%s", Bytecodes::name(bc));
3229 switch (bc) {
3230 case Bytecodes::_invokevirtual:
3231 case Bytecodes::_invokespecial:
3232 case Bytecodes::_invokestatic:
3233 case Bytecodes::_invokeinterface:
3234 {
3235 Bytecode_invoke invoke(sd->method(), sd->bci());
3236 st->print(" ");
3237 if (invoke.name() != NULL)
3238 invoke.name()->print_symbol_on(st);
3239 else
3240 st->print("<UNKNOWN>");
3241 break;
3242 }
3243 case Bytecodes::_getfield:
3244 case Bytecodes::_putfield:
3245 case Bytecodes::_getstatic:
3246 case Bytecodes::_putstatic:
3247 {
3248 Bytecode_field field(sd->method(), sd->bci());
3249 st->print(" ");
3250 if (field.name() != NULL)
3251 field.name()->print_symbol_on(st);
3252 else
3253 st->print("<UNKNOWN>");
3254 }
3255 }
3256 }
3257 }
3258
3259 // Print all scopes
3260 for (;sd != NULL; sd = sd->sender()) {
3261 st->move_to(column);
3262 st->print("; -");
3263 if (sd->method() == NULL) {
3264 st->print("method is NULL");
3265 } else {
3266 sd->method()->print_short_name(st);
3267 }
3268 int lineno = sd->method()->line_number_from_bci(sd->bci());
3269 if (lineno != -1) {
3270 st->print("@%d (line %d)", sd->bci(), lineno);
3271 } else {
3272 st->print("@%d", sd->bci());
3273 }
3274 st->cr();
3275 }
3276 }
3277
3278 // Print relocation information
3279 const char* str = reloc_string_for(begin, end);
3280 if (str != NULL) {
3281 if (sd != NULL) st->cr();
3282 st->move_to(column);
3283 st->print("; {%s}", str);
3284 }
3285 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin());
3286 if (cont_offset != 0) {
3287 st->move_to(column);
3288 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, code_begin() + cont_offset);
3289 }
3290
3291 }
3292
3293 #ifndef PRODUCT
3294
3295 void nmethod::print_value_on(outputStream* st) const {
3296 st->print("nmethod");
3297 print_on(st, NULL);
3298 }
3299
3300 void nmethod::print_calls(outputStream* st) {
3301 RelocIterator iter(this);
3302 while (iter.next()) {
3303 switch (iter.type()) {
3304 case relocInfo::virtual_call_type:
3305 case relocInfo::opt_virtual_call_type: {
3306 VerifyMutexLocker mc(CompiledIC_lock);
3307 CompiledIC_at(&iter)->print();
3308 break;
3309 }
3310 case relocInfo::static_call_type:
3311 st->print_cr("Static call at " INTPTR_FORMAT, iter.reloc()->addr());
3312 compiledStaticCall_at(iter.reloc())->print();
3313 break;
3314 }
3315 }
3316 }
3317
3318 void nmethod::print_handler_table() {
3319 ExceptionHandlerTable(this).print();
3320 }
3321
3322 void nmethod::print_nul_chk_table() {
3323 ImplicitExceptionTable(this).print(code_begin());
3324 }
3325
3326 void nmethod::print_statistics() {
3327 ttyLocker ttyl;
3328 if (xtty != NULL) xtty->head("statistics type='nmethod'");
3329 nmethod_stats.print_native_nmethod_stats();
3330 nmethod_stats.print_nmethod_stats();
3331 DebugInformationRecorder::print_statistics();
3332 nmethod_stats.print_pc_stats();
3333 Dependencies::print_statistics();
3334 if (xtty != NULL) xtty->tail("statistics");
3335 }
3336
3337 #endif // PRODUCT