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