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(No_Safepoint_Verifier 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(No_Safepoint_Verifier 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 (PrintDebugInfo || CompilerOracle::has_option_string(_method, "PrintDebugInfo")) {
984 print_scopes();
985 }
986 if (PrintRelocations || CompilerOracle::has_option_string(_method, "PrintRelocations")) {
987 print_relocations();
988 }
989 if (PrintDependencies || CompilerOracle::has_option_string(_method, "PrintDependencies")) {
990 print_dependencies();
991 }
992 if (PrintExceptionHandlers) {
993 print_handler_table();
994 print_nul_chk_table();
995 }
996 if (xtty != NULL) {
997 xtty->tail("print_nmethod");
998 }
999 }
1000
1001
1002 // Promote one word from an assembly-time handle to a live embedded oop.
1003 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
1004 if (handle == NULL ||
1005 // As a special case, IC oops are initialized to 1 or -1.
1006 handle == (jobject) Universe::non_oop_word()) {
1007 (*dest) = (oop) handle;
1008 } else {
1009 (*dest) = JNIHandles::resolve_non_null(handle);
1010 }
1011 }
1012
1013
1014 // Have to have the same name because it's called by a template
1015 void nmethod::copy_values(GrowableArray<jobject>* array) {
1016 int length = array->length();
1017 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
1018 oop* dest = oops_begin();
1019 for (int index = 0 ; index < length; index++) {
1020 initialize_immediate_oop(&dest[index], array->at(index));
1021 }
1022
1023 // Now we can fix up all the oops in the code. We need to do this
1024 // in the code because the assembler uses jobjects as placeholders.
1025 // The code and relocations have already been initialized by the
1026 // CodeBlob constructor, so it is valid even at this early point to
1027 // iterate over relocations and patch the code.
1028 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true);
1029 }
1030
1031 void nmethod::copy_values(GrowableArray<Metadata*>* array) {
1032 int length = array->length();
1033 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough");
1034 Metadata** dest = metadata_begin();
1035 for (int index = 0 ; index < length; index++) {
1036 dest[index] = array->at(index);
1037 }
1038 }
1039
1040 bool nmethod::is_at_poll_return(address pc) {
1041 RelocIterator iter(this, pc, pc+1);
1042 while (iter.next()) {
1043 if (iter.type() == relocInfo::poll_return_type)
1044 return true;
1045 }
1046 return false;
1047 }
1048
1049
1050 bool nmethod::is_at_poll_or_poll_return(address pc) {
1051 RelocIterator iter(this, pc, pc+1);
1052 while (iter.next()) {
1053 relocInfo::relocType t = iter.type();
1054 if (t == relocInfo::poll_return_type || t == relocInfo::poll_type)
1055 return true;
1056 }
1057 return false;
1058 }
1059
1060
1061 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) {
1062 // re-patch all oop-bearing instructions, just in case some oops moved
1063 RelocIterator iter(this, begin, end);
1064 while (iter.next()) {
1065 if (iter.type() == relocInfo::oop_type) {
1066 oop_Relocation* reloc = iter.oop_reloc();
1067 if (initialize_immediates && reloc->oop_is_immediate()) {
1068 oop* dest = reloc->oop_addr();
1069 initialize_immediate_oop(dest, (jobject) *dest);
1070 }
1071 // Refresh the oop-related bits of this instruction.
1072 reloc->fix_oop_relocation();
1073 } else if (iter.type() == relocInfo::metadata_type) {
1074 metadata_Relocation* reloc = iter.metadata_reloc();
1075 reloc->fix_metadata_relocation();
1076 }
1077 }
1078 }
1079
1080
1081 void nmethod::verify_oop_relocations() {
1082 // Ensure sure that the code matches the current oop values
1083 RelocIterator iter(this, NULL, NULL);
1084 while (iter.next()) {
1085 if (iter.type() == relocInfo::oop_type) {
1086 oop_Relocation* reloc = iter.oop_reloc();
1087 if (!reloc->oop_is_immediate()) {
1088 reloc->verify_oop_relocation();
1089 }
1090 }
1091 }
1092 }
1093
1094
1095 ScopeDesc* nmethod::scope_desc_at(address pc) {
1096 PcDesc* pd = pc_desc_at(pc);
1097 guarantee(pd != NULL, "scope must be present");
1098 return new ScopeDesc(this, pd->scope_decode_offset(),
1099 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(),
1100 pd->return_oop());
1101 }
1102
1103
1104 void nmethod::clear_inline_caches() {
1105 assert(SafepointSynchronize::is_at_safepoint(), "cleaning of IC's only allowed at safepoint");
1106 if (is_zombie()) {
1107 return;
1108 }
1109
1110 RelocIterator iter(this);
1111 while (iter.next()) {
1112 iter.reloc()->clear_inline_cache();
1113 }
1114 }
1115
1116 // Clear ICStubs of all compiled ICs
1117 void nmethod::clear_ic_stubs() {
1118 assert_locked_or_safepoint(CompiledIC_lock);
1119 RelocIterator iter(this);
1120 while(iter.next()) {
1121 if (iter.type() == relocInfo::virtual_call_type) {
1122 CompiledIC* ic = CompiledIC_at(&iter);
1123 ic->clear_ic_stub();
1124 }
1125 }
1126 }
1127
1128
1129 void nmethod::cleanup_inline_caches() {
1130 assert_locked_or_safepoint(CompiledIC_lock);
1131
1132 // If the method is not entrant or zombie then a JMP is plastered over the
1133 // first few bytes. If an oop in the old code was there, that oop
1134 // should not get GC'd. Skip the first few bytes of oops on
1135 // not-entrant methods.
1136 address low_boundary = verified_entry_point();
1137 if (!is_in_use()) {
1138 low_boundary += NativeJump::instruction_size;
1139 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1140 // This means that the low_boundary is going to be a little too high.
1141 // This shouldn't matter, since oops of non-entrant methods are never used.
1142 // In fact, why are we bothering to look at oops in a non-entrant method??
1143 }
1144
1145 // Find all calls in an nmethod and clear the ones that point to non-entrant,
1146 // zombie and unloaded nmethods.
1147 ResourceMark rm;
1148 RelocIterator iter(this, low_boundary);
1149 while(iter.next()) {
1150 switch(iter.type()) {
1151 case relocInfo::virtual_call_type:
1152 case relocInfo::opt_virtual_call_type: {
1153 CompiledIC *ic = CompiledIC_at(&iter);
1154 // Ok, to lookup references to zombies here
1155 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
1156 if( cb != NULL && cb->is_nmethod() ) {
1157 nmethod* nm = (nmethod*)cb;
1158 // Clean inline caches pointing to zombie, non-entrant and unloaded methods
1159 if (!nm->is_in_use() || (nm->method()->code() != nm)) ic->set_to_clean(is_alive());
1160 }
1161 break;
1162 }
1163 case relocInfo::static_call_type: {
1164 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
1165 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
1166 if( cb != NULL && cb->is_nmethod() ) {
1167 nmethod* nm = (nmethod*)cb;
1168 // Clean inline caches pointing to zombie, non-entrant and unloaded methods
1169 if (!nm->is_in_use() || (nm->method()->code() != nm)) csc->set_to_clean();
1170 }
1171 break;
1172 }
1173 }
1174 }
1175 }
1176
1177 void nmethod::verify_clean_inline_caches() {
1178 assert_locked_or_safepoint(CompiledIC_lock);
1179
1180 // If the method is not entrant or zombie then a JMP is plastered over the
1181 // first few bytes. If an oop in the old code was there, that oop
1182 // should not get GC'd. Skip the first few bytes of oops on
1183 // not-entrant methods.
1184 address low_boundary = verified_entry_point();
1185 if (!is_in_use()) {
1186 low_boundary += NativeJump::instruction_size;
1187 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1188 // This means that the low_boundary is going to be a little too high.
1189 // This shouldn't matter, since oops of non-entrant methods are never used.
1190 // In fact, why are we bothering to look at oops in a non-entrant method??
1191 }
1192
1193 ResourceMark rm;
1194 RelocIterator iter(this, low_boundary);
1195 while(iter.next()) {
1196 switch(iter.type()) {
1197 case relocInfo::virtual_call_type:
1198 case relocInfo::opt_virtual_call_type: {
1199 CompiledIC *ic = CompiledIC_at(&iter);
1200 // Ok, to lookup references to zombies here
1201 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
1202 if( cb != NULL && cb->is_nmethod() ) {
1203 nmethod* nm = (nmethod*)cb;
1204 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
1205 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1206 assert(ic->is_clean(), "IC should be clean");
1207 }
1208 }
1209 break;
1210 }
1211 case relocInfo::static_call_type: {
1212 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
1213 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
1214 if( cb != NULL && cb->is_nmethod() ) {
1215 nmethod* nm = (nmethod*)cb;
1216 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
1217 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1218 assert(csc->is_clean(), "IC should be clean");
1219 }
1220 }
1221 break;
1222 }
1223 }
1224 }
1225 }
1226
1227 int nmethod::verify_icholder_relocations() {
1228 int count = 0;
1229
1230 RelocIterator iter(this);
1231 while(iter.next()) {
1232 if (iter.type() == relocInfo::virtual_call_type) {
1233 if (CompiledIC::is_icholder_call_site(iter.virtual_call_reloc())) {
1234 CompiledIC *ic = CompiledIC_at(&iter);
1235 if (TraceCompiledIC) {
1236 tty->print("noticed icholder " INTPTR_FORMAT " ", p2i(ic->cached_icholder()));
1237 ic->print();
1238 }
1239 assert(ic->cached_icholder() != NULL, "must be non-NULL");
1240 count++;
1241 }
1242 }
1243 }
1244
1245 return count;
1246 }
1247
1248 // This is a private interface with the sweeper.
1249 void nmethod::mark_as_seen_on_stack() {
1250 assert(is_alive(), "Must be an alive method");
1251 // Set the traversal mark to ensure that the sweeper does 2
1252 // cleaning passes before moving to zombie.
1253 set_stack_traversal_mark(NMethodSweeper::traversal_count());
1254 }
1255
1256 // Tell if a non-entrant method can be converted to a zombie (i.e.,
1257 // there are no activations on the stack, not in use by the VM,
1258 // and not in use by the ServiceThread)
1259 bool nmethod::can_convert_to_zombie() {
1260 assert(is_not_entrant(), "must be a non-entrant method");
1261
1262 // Since the nmethod sweeper only does partial sweep the sweeper's traversal
1263 // count can be greater than the stack traversal count before it hits the
1264 // nmethod for the second time.
1265 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count() &&
1266 !is_locked_by_vm();
1267 }
1268
1269 void nmethod::inc_decompile_count() {
1270 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return;
1271 // Could be gated by ProfileTraps, but do not bother...
1272 Method* m = method();
1273 if (m == NULL) return;
1274 MethodData* mdo = m->method_data();
1275 if (mdo == NULL) return;
1276 // There is a benign race here. See comments in methodData.hpp.
1277 mdo->inc_decompile_count();
1278 }
1279
1280 void nmethod::increase_unloading_clock() {
1281 _global_unloading_clock++;
1282 if (_global_unloading_clock == 0) {
1283 // _nmethods are allocated with _unloading_clock == 0,
1284 // so 0 is never used as a clock value.
1285 _global_unloading_clock = 1;
1286 }
1287 }
1288
1289 void nmethod::set_unloading_clock(unsigned char unloading_clock) {
1290 OrderAccess::release_store((volatile jubyte*)&_unloading_clock, unloading_clock);
1291 }
1292
1293 unsigned char nmethod::unloading_clock() {
1294 return (unsigned char)OrderAccess::load_acquire((volatile jubyte*)&_unloading_clock);
1295 }
1296
1297 void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) {
1298
1299 post_compiled_method_unload();
1300
1301 // Since this nmethod is being unloaded, make sure that dependencies
1302 // recorded in instanceKlasses get flushed and pass non-NULL closure to
1303 // indicate that this work is being done during a GC.
1304 assert(Universe::heap()->is_gc_active(), "should only be called during gc");
1305 assert(is_alive != NULL, "Should be non-NULL");
1306 // A non-NULL is_alive closure indicates that this is being called during GC.
1307 flush_dependencies(is_alive);
1308
1309 // Break cycle between nmethod & method
1310 if (log_is_enabled(Trace, classunload)) {
1311 outputStream* log = LogHandle(classunload)::trace_stream();
1312 log->print_cr("[Class unloading: Making nmethod " INTPTR_FORMAT
1313 " unloadable], Method*(" INTPTR_FORMAT
1314 "), cause(" INTPTR_FORMAT ")",
1315 p2i(this), p2i(_method), p2i(cause));
1316 if (!Universe::heap()->is_gc_active())
1317 cause->klass()->print_on(log);
1318 }
1319 // Unlink the osr method, so we do not look this up again
1320 if (is_osr_method()) {
1321 invalidate_osr_method();
1322 }
1323 // If _method is already NULL the Method* is about to be unloaded,
1324 // so we don't have to break the cycle. Note that it is possible to
1325 // have the Method* live here, in case we unload the nmethod because
1326 // it is pointing to some oop (other than the Method*) being unloaded.
1327 if (_method != NULL) {
1328 // OSR methods point to the Method*, but the Method* does not
1329 // point back!
1330 if (_method->code() == this) {
1331 _method->clear_code(); // Break a cycle
1332 }
1333 _method = NULL; // Clear the method of this dead nmethod
1334 }
1335
1336 // Make the class unloaded - i.e., change state and notify sweeper
1337 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
1338 if (is_in_use()) {
1339 // Transitioning directly from live to unloaded -- so
1340 // we need to force a cache clean-up; remember this
1341 // for later on.
1342 CodeCache::set_needs_cache_clean(true);
1343 }
1344
1345 // Unregister must be done before the state change
1346 Universe::heap()->unregister_nmethod(this);
1347
1348 _state = unloaded;
1349
1350 #if INCLUDE_JVMCI
1351 // The method can only be unloaded after the pointer to the installed code
1352 // Java wrapper is no longer alive. Here we need to clear out this weak
1353 // reference to the dead object. Nulling out the reference has to happen
1354 // after the method is unregistered since the original value may be still
1355 // tracked by the rset.
1356 maybe_invalidate_installed_code();
1357 #endif
1358
1359 // Log the unloading.
1360 log_state_change();
1361
1362 // The Method* is gone at this point
1363 assert(_method == NULL, "Tautology");
1364
1365 set_osr_link(NULL);
1366 //set_scavenge_root_link(NULL); // done by prune_scavenge_root_nmethods
1367 NMethodSweeper::report_state_change(this);
1368 }
1369
1370 void nmethod::invalidate_osr_method() {
1371 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
1372 // Remove from list of active nmethods
1373 if (method() != NULL)
1374 method()->method_holder()->remove_osr_nmethod(this);
1375 }
1376
1377 void nmethod::log_state_change() const {
1378 if (LogCompilation) {
1379 if (xtty != NULL) {
1380 ttyLocker ttyl; // keep the following output all in one block
1381 if (_state == unloaded) {
1382 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'",
1383 os::current_thread_id());
1384 } else {
1385 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s",
1386 os::current_thread_id(),
1387 (_state == zombie ? " zombie='1'" : ""));
1388 }
1389 log_identity(xtty);
1390 xtty->stamp();
1391 xtty->end_elem();
1392 }
1393 }
1394 if (PrintCompilation && _state != unloaded) {
1395 print_on(tty, _state == zombie ? "made zombie" : "made not entrant");
1396 }
1397 }
1398
1399 /**
1400 * Common functionality for both make_not_entrant and make_zombie
1401 */
1402 bool nmethod::make_not_entrant_or_zombie(unsigned int state) {
1403 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant");
1404 assert(!is_zombie(), "should not already be a zombie");
1405
1406 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below.
1407 nmethodLocker nml(this);
1408 methodHandle the_method(method());
1409 No_Safepoint_Verifier nsv;
1410
1411 // during patching, depending on the nmethod state we must notify the GC that
1412 // code has been unloaded, unregistering it. We cannot do this right while
1413 // holding the Patching_lock because we need to use the CodeCache_lock. This
1414 // would be prone to deadlocks.
1415 // This flag is used to remember whether we need to later lock and unregister.
1416 bool nmethod_needs_unregister = false;
1417
1418 {
1419 // invalidate osr nmethod before acquiring the patching lock since
1420 // they both acquire leaf locks and we don't want a deadlock.
1421 // This logic is equivalent to the logic below for patching the
1422 // verified entry point of regular methods.
1423 if (is_osr_method()) {
1424 // this effectively makes the osr nmethod not entrant
1425 invalidate_osr_method();
1426 }
1427
1428 // Enter critical section. Does not block for safepoint.
1429 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1430
1431 if (_state == state) {
1432 // another thread already performed this transition so nothing
1433 // to do, but return false to indicate this.
1434 return false;
1435 }
1436
1437 // The caller can be calling the method statically or through an inline
1438 // cache call.
1439 if (!is_osr_method() && !is_not_entrant()) {
1440 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
1441 SharedRuntime::get_handle_wrong_method_stub());
1442 }
1443
1444 if (is_in_use()) {
1445 // It's a true state change, so mark the method as decompiled.
1446 // Do it only for transition from alive.
1447 inc_decompile_count();
1448 }
1449
1450 // If the state is becoming a zombie, signal to unregister the nmethod with
1451 // the heap.
1452 // This nmethod may have already been unloaded during a full GC.
1453 if ((state == zombie) && !is_unloaded()) {
1454 nmethod_needs_unregister = true;
1455 }
1456
1457 // Must happen before state change. Otherwise we have a race condition in
1458 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately
1459 // transition its state from 'not_entrant' to 'zombie' without having to wait
1460 // for stack scanning.
1461 if (state == not_entrant) {
1462 mark_as_seen_on_stack();
1463 OrderAccess::storestore();
1464 }
1465
1466 // Change state
1467 _state = state;
1468
1469 // Log the transition once
1470 log_state_change();
1471
1472 // Remove nmethod from method.
1473 // We need to check if both the _code and _from_compiled_code_entry_point
1474 // refer to this nmethod because there is a race in setting these two fields
1475 // in Method* as seen in bugid 4947125.
1476 // If the vep() points to the zombie nmethod, the memory for the nmethod
1477 // could be flushed and the compiler and vtable stubs could still call
1478 // through it.
1479 if (method() != NULL && (method()->code() == this ||
1480 method()->from_compiled_entry() == verified_entry_point())) {
1481 HandleMark hm;
1482 method()->clear_code();
1483 }
1484 } // leave critical region under Patching_lock
1485
1486 // When the nmethod becomes zombie it is no longer alive so the
1487 // dependencies must be flushed. nmethods in the not_entrant
1488 // state will be flushed later when the transition to zombie
1489 // happens or they get unloaded.
1490 if (state == zombie) {
1491 {
1492 // Flushing dependecies must be done before any possible
1493 // safepoint can sneak in, otherwise the oops used by the
1494 // dependency logic could have become stale.
1495 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1496 if (nmethod_needs_unregister) {
1497 Universe::heap()->unregister_nmethod(this);
1498 }
1499 flush_dependencies(NULL);
1500 }
1501
1502 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload
1503 // event and it hasn't already been reported for this nmethod then
1504 // report it now. The event may have been reported earilier if the GC
1505 // marked it for unloading). JvmtiDeferredEventQueue support means
1506 // we no longer go to a safepoint here.
1507 post_compiled_method_unload();
1508
1509 #ifdef ASSERT
1510 // It's no longer safe to access the oops section since zombie
1511 // nmethods aren't scanned for GC.
1512 _oops_are_stale = true;
1513 #endif
1514 // the Method may be reclaimed by class unloading now that the
1515 // nmethod is in zombie state
1516 set_method(NULL);
1517 } else {
1518 assert(state == not_entrant, "other cases may need to be handled differently");
1519 }
1520
1521 JVMCI_ONLY(maybe_invalidate_installed_code());
1522
1523 if (TraceCreateZombies) {
1524 ResourceMark m;
1525 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");
1526 }
1527
1528 NMethodSweeper::report_state_change(this);
1529 return true;
1530 }
1531
1532 void nmethod::flush() {
1533 // Note that there are no valid oops in the nmethod anymore.
1534 assert(is_zombie() || (is_osr_method() && is_unloaded()), "must be a zombie method");
1535 assert(is_marked_for_reclamation() || (is_osr_method() && is_unloaded()), "must be marked for reclamation");
1536
1537 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed");
1538 assert_locked_or_safepoint(CodeCache_lock);
1539
1540 // completely deallocate this method
1541 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, p2i(this));
1542 if (PrintMethodFlushing) {
1543 tty->print_cr("*flushing nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT
1544 "/Free CodeCache:" SIZE_FORMAT "Kb",
1545 _compile_id, p2i(this), CodeCache::blob_count(),
1546 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024);
1547 }
1548
1549 // We need to deallocate any ExceptionCache data.
1550 // Note that we do not need to grab the nmethod lock for this, it
1551 // better be thread safe if we're disposing of it!
1552 ExceptionCache* ec = exception_cache();
1553 set_exception_cache(NULL);
1554 while(ec != NULL) {
1555 ExceptionCache* next = ec->next();
1556 delete ec;
1557 ec = next;
1558 }
1559
1560 if (on_scavenge_root_list()) {
1561 CodeCache::drop_scavenge_root_nmethod(this);
1562 }
1563
1564 #ifdef SHARK
1565 ((SharkCompiler *) compiler())->free_compiled_method(insts_begin());
1566 #endif // SHARK
1567
1568 ((CodeBlob*)(this))->flush();
1569
1570 CodeCache::free(this);
1571 }
1572
1573 //
1574 // Notify all classes this nmethod is dependent on that it is no
1575 // longer dependent. This should only be called in two situations.
1576 // First, when a nmethod transitions to a zombie all dependents need
1577 // to be clear. Since zombification happens at a safepoint there's no
1578 // synchronization issues. The second place is a little more tricky.
1579 // During phase 1 of mark sweep class unloading may happen and as a
1580 // result some nmethods may get unloaded. In this case the flushing
1581 // of dependencies must happen during phase 1 since after GC any
1582 // dependencies in the unloaded nmethod won't be updated, so
1583 // traversing the dependency information in unsafe. In that case this
1584 // function is called with a non-NULL argument and this function only
1585 // notifies instanceKlasses that are reachable
1586
1587 void nmethod::flush_dependencies(BoolObjectClosure* is_alive) {
1588 assert_locked_or_safepoint(CodeCache_lock);
1589 assert(Universe::heap()->is_gc_active() == (is_alive != NULL),
1590 "is_alive is non-NULL if and only if we are called during GC");
1591 if (!has_flushed_dependencies()) {
1592 set_has_flushed_dependencies();
1593 for (Dependencies::DepStream deps(this); deps.next(); ) {
1594 if (deps.type() == Dependencies::call_site_target_value) {
1595 // CallSite dependencies are managed on per-CallSite instance basis.
1596 oop call_site = deps.argument_oop(0);
1597 MethodHandles::remove_dependent_nmethod(call_site, this);
1598 } else {
1599 Klass* klass = deps.context_type();
1600 if (klass == NULL) {
1601 continue; // ignore things like evol_method
1602 }
1603 // During GC the is_alive closure is non-NULL, and is used to
1604 // determine liveness of dependees that need to be updated.
1605 if (is_alive == NULL || klass->is_loader_alive(is_alive)) {
1606 // The GC defers deletion of this entry, since there might be multiple threads
1607 // iterating over the _dependencies graph. Other call paths are single-threaded
1608 // and may delete it immediately.
1609 bool delete_immediately = is_alive == NULL;
1610 InstanceKlass::cast(klass)->remove_dependent_nmethod(this, delete_immediately);
1611 }
1612 }
1613 }
1614 }
1615 }
1616
1617
1618 // If this oop is not live, the nmethod can be unloaded.
1619 bool nmethod::can_unload(BoolObjectClosure* is_alive, oop* root, bool unloading_occurred) {
1620 assert(root != NULL, "just checking");
1621 oop obj = *root;
1622 if (obj == NULL || is_alive->do_object_b(obj)) {
1623 return false;
1624 }
1625
1626 // If ScavengeRootsInCode is true, an nmethod might be unloaded
1627 // simply because one of its constant oops has gone dead.
1628 // No actual classes need to be unloaded in order for this to occur.
1629 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading");
1630 make_unloaded(is_alive, obj);
1631 return true;
1632 }
1633
1634 // ------------------------------------------------------------------
1635 // post_compiled_method_load_event
1636 // new method for install_code() path
1637 // Transfer information from compilation to jvmti
1638 void nmethod::post_compiled_method_load_event() {
1639
1640 Method* moop = method();
1641 HOTSPOT_COMPILED_METHOD_LOAD(
1642 (char *) moop->klass_name()->bytes(),
1643 moop->klass_name()->utf8_length(),
1644 (char *) moop->name()->bytes(),
1645 moop->name()->utf8_length(),
1646 (char *) moop->signature()->bytes(),
1647 moop->signature()->utf8_length(),
1648 insts_begin(), insts_size());
1649
1650 if (JvmtiExport::should_post_compiled_method_load() ||
1651 JvmtiExport::should_post_compiled_method_unload()) {
1652 get_and_cache_jmethod_id();
1653 }
1654
1655 if (JvmtiExport::should_post_compiled_method_load()) {
1656 // Let the Service thread (which is a real Java thread) post the event
1657 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1658 JvmtiDeferredEventQueue::enqueue(
1659 JvmtiDeferredEvent::compiled_method_load_event(this));
1660 }
1661 }
1662
1663 jmethodID nmethod::get_and_cache_jmethod_id() {
1664 if (_jmethod_id == NULL) {
1665 // Cache the jmethod_id since it can no longer be looked up once the
1666 // method itself has been marked for unloading.
1667 _jmethod_id = method()->jmethod_id();
1668 }
1669 return _jmethod_id;
1670 }
1671
1672 void nmethod::post_compiled_method_unload() {
1673 if (unload_reported()) {
1674 // During unloading we transition to unloaded and then to zombie
1675 // and the unloading is reported during the first transition.
1676 return;
1677 }
1678
1679 assert(_method != NULL && !is_unloaded(), "just checking");
1680 DTRACE_METHOD_UNLOAD_PROBE(method());
1681
1682 // If a JVMTI agent has enabled the CompiledMethodUnload event then
1683 // post the event. Sometime later this nmethod will be made a zombie
1684 // by the sweeper but the Method* will not be valid at that point.
1685 // If the _jmethod_id is null then no load event was ever requested
1686 // so don't bother posting the unload. The main reason for this is
1687 // that the jmethodID is a weak reference to the Method* so if
1688 // it's being unloaded there's no way to look it up since the weak
1689 // ref will have been cleared.
1690 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) {
1691 assert(!unload_reported(), "already unloaded");
1692 JvmtiDeferredEvent event =
1693 JvmtiDeferredEvent::compiled_method_unload_event(this,
1694 _jmethod_id, insts_begin());
1695 if (SafepointSynchronize::is_at_safepoint()) {
1696 // Don't want to take the queueing lock. Add it as pending and
1697 // it will get enqueued later.
1698 JvmtiDeferredEventQueue::add_pending_event(event);
1699 } else {
1700 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1701 JvmtiDeferredEventQueue::enqueue(event);
1702 }
1703 }
1704
1705 // The JVMTI CompiledMethodUnload event can be enabled or disabled at
1706 // any time. As the nmethod is being unloaded now we mark it has
1707 // having the unload event reported - this will ensure that we don't
1708 // attempt to report the event in the unlikely scenario where the
1709 // event is enabled at the time the nmethod is made a zombie.
1710 set_unload_reported();
1711 }
1712
1713 void static clean_ic_if_metadata_is_dead(CompiledIC *ic, BoolObjectClosure *is_alive) {
1714 if (ic->is_icholder_call()) {
1715 // The only exception is compiledICHolder oops which may
1716 // yet be marked below. (We check this further below).
1717 CompiledICHolder* cichk_oop = ic->cached_icholder();
1718
1719 if (cichk_oop->holder_method()->method_holder()->is_loader_alive(is_alive) &&
1720 cichk_oop->holder_klass()->is_loader_alive(is_alive)) {
1721 return;
1722 }
1723 } else {
1724 Metadata* ic_oop = ic->cached_metadata();
1725 if (ic_oop != NULL) {
1726 if (ic_oop->is_klass()) {
1727 if (((Klass*)ic_oop)->is_loader_alive(is_alive)) {
1728 return;
1729 }
1730 } else if (ic_oop->is_method()) {
1731 if (((Method*)ic_oop)->method_holder()->is_loader_alive(is_alive)) {
1732 return;
1733 }
1734 } else {
1735 ShouldNotReachHere();
1736 }
1737 }
1738 }
1739
1740 ic->set_to_clean();
1741 }
1742
1743 // This is called at the end of the strong tracing/marking phase of a
1744 // GC to unload an nmethod if it contains otherwise unreachable
1745 // oops.
1746
1747 void nmethod::do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred) {
1748 // Make sure the oop's ready to receive visitors
1749 assert(!is_zombie() && !is_unloaded(),
1750 "should not call follow on zombie or unloaded nmethod");
1751
1752 // If the method is not entrant then a JMP is plastered over the
1753 // first few bytes. If an oop in the old code was there, that oop
1754 // should not get GC'd. Skip the first few bytes of oops on
1755 // not-entrant methods.
1756 address low_boundary = verified_entry_point();
1757 if (is_not_entrant()) {
1758 low_boundary += NativeJump::instruction_size;
1759 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1760 // (See comment above.)
1761 }
1762
1763 // The RedefineClasses() API can cause the class unloading invariant
1764 // to no longer be true. See jvmtiExport.hpp for details.
1765 // Also, leave a debugging breadcrumb in local flag.
1766 if (JvmtiExport::has_redefined_a_class()) {
1767 // This set of the unloading_occurred flag is done before the
1768 // call to post_compiled_method_unload() so that the unloading
1769 // of this nmethod is reported.
1770 unloading_occurred = true;
1771 }
1772
1773 // Exception cache
1774 clean_exception_cache(is_alive);
1775
1776 // If class unloading occurred we first iterate over all inline caches and
1777 // clear ICs where the cached oop is referring to an unloaded klass or method.
1778 // The remaining live cached oops will be traversed in the relocInfo::oop_type
1779 // iteration below.
1780 if (unloading_occurred) {
1781 RelocIterator iter(this, low_boundary);
1782 while(iter.next()) {
1783 if (iter.type() == relocInfo::virtual_call_type) {
1784 CompiledIC *ic = CompiledIC_at(&iter);
1785 clean_ic_if_metadata_is_dead(ic, is_alive);
1786 }
1787 }
1788 }
1789
1790 // Compiled code
1791 {
1792 RelocIterator iter(this, low_boundary);
1793 while (iter.next()) {
1794 if (iter.type() == relocInfo::oop_type) {
1795 oop_Relocation* r = iter.oop_reloc();
1796 // In this loop, we must only traverse those oops directly embedded in
1797 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1798 assert(1 == (r->oop_is_immediate()) +
1799 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1800 "oop must be found in exactly one place");
1801 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1802 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) {
1803 return;
1804 }
1805 }
1806 }
1807 }
1808 }
1809
1810
1811 // Scopes
1812 for (oop* p = oops_begin(); p < oops_end(); p++) {
1813 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1814 if (can_unload(is_alive, p, unloading_occurred)) {
1815 return;
1816 }
1817 }
1818
1819 #if INCLUDE_JVMCI
1820 // Follow JVMCI method
1821 BarrierSet* bs = Universe::heap()->barrier_set();
1822 if (_jvmci_installed_code != NULL) {
1823 if (_jvmci_installed_code->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(_jvmci_installed_code)) {
1824 if (!is_alive->do_object_b(_jvmci_installed_code)) {
1825 clear_jvmci_installed_code();
1826 }
1827 } else {
1828 if (can_unload(is_alive, (oop*)&_jvmci_installed_code, unloading_occurred)) {
1829 return;
1830 }
1831 }
1832 }
1833
1834 if (_speculation_log != NULL) {
1835 if (!is_alive->do_object_b(_speculation_log)) {
1836 bs->write_ref_nmethod_pre(&_speculation_log, this);
1837 _speculation_log = NULL;
1838 bs->write_ref_nmethod_post(&_speculation_log, this);
1839 }
1840 }
1841 #endif
1842
1843
1844 // Ensure that all metadata is still alive
1845 verify_metadata_loaders(low_boundary, is_alive);
1846 }
1847
1848 template <class CompiledICorStaticCall>
1849 static bool clean_if_nmethod_is_unloaded(CompiledICorStaticCall *ic, address addr, BoolObjectClosure *is_alive, nmethod* from) {
1850 // Ok, to lookup references to zombies here
1851 CodeBlob *cb = CodeCache::find_blob_unsafe(addr);
1852 if (cb != NULL && cb->is_nmethod()) {
1853 nmethod* nm = (nmethod*)cb;
1854
1855 if (nm->unloading_clock() != nmethod::global_unloading_clock()) {
1856 // The nmethod has not been processed yet.
1857 return true;
1858 }
1859
1860 // Clean inline caches pointing to both zombie and not_entrant methods
1861 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1862 ic->set_to_clean();
1863 assert(ic->is_clean(), "nmethod " PTR_FORMAT "not clean %s", p2i(from), from->method()->name_and_sig_as_C_string());
1864 }
1865 }
1866
1867 return false;
1868 }
1869
1870 static bool clean_if_nmethod_is_unloaded(CompiledIC *ic, BoolObjectClosure *is_alive, nmethod* from) {
1871 return clean_if_nmethod_is_unloaded(ic, ic->ic_destination(), is_alive, from);
1872 }
1873
1874 static bool clean_if_nmethod_is_unloaded(CompiledStaticCall *csc, BoolObjectClosure *is_alive, nmethod* from) {
1875 return clean_if_nmethod_is_unloaded(csc, csc->destination(), is_alive, from);
1876 }
1877
1878 bool nmethod::unload_if_dead_at(RelocIterator* iter_at_oop, BoolObjectClosure *is_alive, bool unloading_occurred) {
1879 assert(iter_at_oop->type() == relocInfo::oop_type, "Wrong relocation type");
1880
1881 oop_Relocation* r = iter_at_oop->oop_reloc();
1882 // Traverse those oops directly embedded in the code.
1883 // Other oops (oop_index>0) are seen as part of scopes_oops.
1884 assert(1 == (r->oop_is_immediate()) +
1885 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1886 "oop must be found in exactly one place");
1887 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1888 // Unload this nmethod if the oop is dead.
1889 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) {
1890 return true;;
1891 }
1892 }
1893
1894 return false;
1895 }
1896
1897
1898 bool nmethod::do_unloading_parallel(BoolObjectClosure* is_alive, bool unloading_occurred) {
1899 ResourceMark rm;
1900
1901 // Make sure the oop's ready to receive visitors
1902 assert(!is_zombie() && !is_unloaded(),
1903 "should not call follow on zombie or unloaded nmethod");
1904
1905 // If the method is not entrant then a JMP is plastered over the
1906 // first few bytes. If an oop in the old code was there, that oop
1907 // should not get GC'd. Skip the first few bytes of oops on
1908 // not-entrant methods.
1909 address low_boundary = verified_entry_point();
1910 if (is_not_entrant()) {
1911 low_boundary += NativeJump::instruction_size;
1912 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1913 // (See comment above.)
1914 }
1915
1916 // The RedefineClasses() API can cause the class unloading invariant
1917 // to no longer be true. See jvmtiExport.hpp for details.
1918 // Also, leave a debugging breadcrumb in local flag.
1919 if (JvmtiExport::has_redefined_a_class()) {
1920 // This set of the unloading_occurred flag is done before the
1921 // call to post_compiled_method_unload() so that the unloading
1922 // of this nmethod is reported.
1923 unloading_occurred = true;
1924 }
1925
1926 // Exception cache
1927 clean_exception_cache(is_alive);
1928
1929 bool is_unloaded = false;
1930 bool postponed = false;
1931
1932 RelocIterator iter(this, low_boundary);
1933 while(iter.next()) {
1934
1935 switch (iter.type()) {
1936
1937 case relocInfo::virtual_call_type:
1938 if (unloading_occurred) {
1939 // If class unloading occurred we first iterate over all inline caches and
1940 // clear ICs where the cached oop is referring to an unloaded klass or method.
1941 clean_ic_if_metadata_is_dead(CompiledIC_at(&iter), is_alive);
1942 }
1943
1944 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
1945 break;
1946
1947 case relocInfo::opt_virtual_call_type:
1948 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
1949 break;
1950
1951 case relocInfo::static_call_type:
1952 postponed |= clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this);
1953 break;
1954
1955 case relocInfo::oop_type:
1956 if (!is_unloaded) {
1957 is_unloaded = unload_if_dead_at(&iter, is_alive, unloading_occurred);
1958 }
1959 break;
1960
1961 case relocInfo::metadata_type:
1962 break; // nothing to do.
1963 }
1964 }
1965
1966 if (is_unloaded) {
1967 return postponed;
1968 }
1969
1970 // Scopes
1971 for (oop* p = oops_begin(); p < oops_end(); p++) {
1972 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1973 if (can_unload(is_alive, p, unloading_occurred)) {
1974 is_unloaded = true;
1975 break;
1976 }
1977 }
1978
1979 if (is_unloaded) {
1980 return postponed;
1981 }
1982
1983 #if INCLUDE_JVMCI
1984 // Follow JVMCI method
1985 BarrierSet* bs = Universe::heap()->barrier_set();
1986 if (_jvmci_installed_code != NULL) {
1987 if (_jvmci_installed_code->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(_jvmci_installed_code)) {
1988 if (!is_alive->do_object_b(_jvmci_installed_code)) {
1989 clear_jvmci_installed_code();
1990 }
1991 } else {
1992 if (can_unload(is_alive, (oop*)&_jvmci_installed_code, unloading_occurred)) {
1993 is_unloaded = true;
1994 }
1995 }
1996 }
1997
1998 if (_speculation_log != NULL) {
1999 if (!is_alive->do_object_b(_speculation_log)) {
2000 bs->write_ref_nmethod_pre(&_speculation_log, this);
2001 _speculation_log = NULL;
2002 bs->write_ref_nmethod_post(&_speculation_log, this);
2003 }
2004 }
2005 #endif
2006
2007 // Ensure that all metadata is still alive
2008 verify_metadata_loaders(low_boundary, is_alive);
2009
2010 return postponed;
2011 }
2012
2013 void nmethod::do_unloading_parallel_postponed(BoolObjectClosure* is_alive, bool unloading_occurred) {
2014 ResourceMark rm;
2015
2016 // Make sure the oop's ready to receive visitors
2017 assert(!is_zombie(),
2018 "should not call follow on zombie nmethod");
2019
2020 // If the method is not entrant then a JMP is plastered over the
2021 // first few bytes. If an oop in the old code was there, that oop
2022 // should not get GC'd. Skip the first few bytes of oops on
2023 // not-entrant methods.
2024 address low_boundary = verified_entry_point();
2025 if (is_not_entrant()) {
2026 low_boundary += NativeJump::instruction_size;
2027 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
2028 // (See comment above.)
2029 }
2030
2031 RelocIterator iter(this, low_boundary);
2032 while(iter.next()) {
2033
2034 switch (iter.type()) {
2035
2036 case relocInfo::virtual_call_type:
2037 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
2038 break;
2039
2040 case relocInfo::opt_virtual_call_type:
2041 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
2042 break;
2043
2044 case relocInfo::static_call_type:
2045 clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this);
2046 break;
2047 }
2048 }
2049 }
2050
2051 #ifdef ASSERT
2052
2053 class CheckClass : AllStatic {
2054 static BoolObjectClosure* _is_alive;
2055
2056 // Check class_loader is alive for this bit of metadata.
2057 static void check_class(Metadata* md) {
2058 Klass* klass = NULL;
2059 if (md->is_klass()) {
2060 klass = ((Klass*)md);
2061 } else if (md->is_method()) {
2062 klass = ((Method*)md)->method_holder();
2063 } else if (md->is_methodData()) {
2064 klass = ((MethodData*)md)->method()->method_holder();
2065 } else {
2066 md->print();
2067 ShouldNotReachHere();
2068 }
2069 assert(klass->is_loader_alive(_is_alive), "must be alive");
2070 }
2071 public:
2072 static void do_check_class(BoolObjectClosure* is_alive, nmethod* nm) {
2073 assert(SafepointSynchronize::is_at_safepoint(), "this is only ok at safepoint");
2074 _is_alive = is_alive;
2075 nm->metadata_do(check_class);
2076 }
2077 };
2078
2079 // This is called during a safepoint so can use static data
2080 BoolObjectClosure* CheckClass::_is_alive = NULL;
2081 #endif // ASSERT
2082
2083
2084 // Processing of oop references should have been sufficient to keep
2085 // all strong references alive. Any weak references should have been
2086 // cleared as well. Visit all the metadata and ensure that it's
2087 // really alive.
2088 void nmethod::verify_metadata_loaders(address low_boundary, BoolObjectClosure* is_alive) {
2089 #ifdef ASSERT
2090 RelocIterator iter(this, low_boundary);
2091 while (iter.next()) {
2092 // static_stub_Relocations may have dangling references to
2093 // Method*s so trim them out here. Otherwise it looks like
2094 // compiled code is maintaining a link to dead metadata.
2095 address static_call_addr = NULL;
2096 if (iter.type() == relocInfo::opt_virtual_call_type) {
2097 CompiledIC* cic = CompiledIC_at(&iter);
2098 if (!cic->is_call_to_interpreted()) {
2099 static_call_addr = iter.addr();
2100 }
2101 } else if (iter.type() == relocInfo::static_call_type) {
2102 CompiledStaticCall* csc = compiledStaticCall_at(iter.reloc());
2103 if (!csc->is_call_to_interpreted()) {
2104 static_call_addr = iter.addr();
2105 }
2106 }
2107 if (static_call_addr != NULL) {
2108 RelocIterator sciter(this, low_boundary);
2109 while (sciter.next()) {
2110 if (sciter.type() == relocInfo::static_stub_type &&
2111 sciter.static_stub_reloc()->static_call() == static_call_addr) {
2112 sciter.static_stub_reloc()->clear_inline_cache();
2113 }
2114 }
2115 }
2116 }
2117 // Check that the metadata embedded in the nmethod is alive
2118 CheckClass::do_check_class(is_alive, this);
2119 #endif
2120 }
2121
2122
2123 // Iterate over metadata calling this function. Used by RedefineClasses
2124 void nmethod::metadata_do(void f(Metadata*)) {
2125 address low_boundary = verified_entry_point();
2126 if (is_not_entrant()) {
2127 low_boundary += NativeJump::instruction_size;
2128 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
2129 // (See comment above.)
2130 }
2131 {
2132 // Visit all immediate references that are embedded in the instruction stream.
2133 RelocIterator iter(this, low_boundary);
2134 while (iter.next()) {
2135 if (iter.type() == relocInfo::metadata_type ) {
2136 metadata_Relocation* r = iter.metadata_reloc();
2137 // In this metadata, we must only follow those metadatas directly embedded in
2138 // the code. Other metadatas (oop_index>0) are seen as part of
2139 // the metadata section below.
2140 assert(1 == (r->metadata_is_immediate()) +
2141 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
2142 "metadata must be found in exactly one place");
2143 if (r->metadata_is_immediate() && r->metadata_value() != NULL) {
2144 Metadata* md = r->metadata_value();
2145 if (md != _method) f(md);
2146 }
2147 } else if (iter.type() == relocInfo::virtual_call_type) {
2148 // Check compiledIC holders associated with this nmethod
2149 CompiledIC *ic = CompiledIC_at(&iter);
2150 if (ic->is_icholder_call()) {
2151 CompiledICHolder* cichk = ic->cached_icholder();
2152 f(cichk->holder_method());
2153 f(cichk->holder_klass());
2154 } else {
2155 Metadata* ic_oop = ic->cached_metadata();
2156 if (ic_oop != NULL) {
2157 f(ic_oop);
2158 }
2159 }
2160 }
2161 }
2162 }
2163
2164 // Visit the metadata section
2165 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
2166 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops
2167 Metadata* md = *p;
2168 f(md);
2169 }
2170
2171 // Visit metadata not embedded in the other places.
2172 if (_method != NULL) f(_method);
2173 }
2174
2175 void nmethod::oops_do(OopClosure* f, bool allow_zombie) {
2176 // make sure the oops ready to receive visitors
2177 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod");
2178 assert(!is_unloaded(), "should not call follow on unloaded nmethod");
2179
2180 // If the method is not entrant or zombie then a JMP is plastered over the
2181 // first few bytes. If an oop in the old code was there, that oop
2182 // should not get GC'd. Skip the first few bytes of oops on
2183 // not-entrant methods.
2184 address low_boundary = verified_entry_point();
2185 if (is_not_entrant()) {
2186 low_boundary += NativeJump::instruction_size;
2187 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
2188 // (See comment above.)
2189 }
2190
2191 #if INCLUDE_JVMCI
2192 if (_jvmci_installed_code != NULL) {
2193 f->do_oop((oop*) &_jvmci_installed_code);
2194 }
2195 if (_speculation_log != NULL) {
2196 f->do_oop((oop*) &_speculation_log);
2197 }
2198 #endif
2199
2200 RelocIterator iter(this, low_boundary);
2201
2202 while (iter.next()) {
2203 if (iter.type() == relocInfo::oop_type ) {
2204 oop_Relocation* r = iter.oop_reloc();
2205 // In this loop, we must only follow those oops directly embedded in
2206 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
2207 assert(1 == (r->oop_is_immediate()) +
2208 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
2209 "oop must be found in exactly one place");
2210 if (r->oop_is_immediate() && r->oop_value() != NULL) {
2211 f->do_oop(r->oop_addr());
2212 }
2213 }
2214 }
2215
2216 // Scopes
2217 // This includes oop constants not inlined in the code stream.
2218 for (oop* p = oops_begin(); p < oops_end(); p++) {
2219 if (*p == Universe::non_oop_word()) continue; // skip non-oops
2220 f->do_oop(p);
2221 }
2222 }
2223
2224 #define NMETHOD_SENTINEL ((nmethod*)badAddress)
2225
2226 nmethod* volatile nmethod::_oops_do_mark_nmethods;
2227
2228 // An nmethod is "marked" if its _mark_link is set non-null.
2229 // Even if it is the end of the linked list, it will have a non-null link value,
2230 // as long as it is on the list.
2231 // This code must be MP safe, because it is used from parallel GC passes.
2232 bool nmethod::test_set_oops_do_mark() {
2233 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");
2234 nmethod* observed_mark_link = _oops_do_mark_link;
2235 if (observed_mark_link == NULL) {
2236 // Claim this nmethod for this thread to mark.
2237 observed_mark_link = (nmethod*)
2238 Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_link, NULL);
2239 if (observed_mark_link == NULL) {
2240
2241 // Atomically append this nmethod (now claimed) to the head of the list:
2242 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods;
2243 for (;;) {
2244 nmethod* required_mark_nmethods = observed_mark_nmethods;
2245 _oops_do_mark_link = required_mark_nmethods;
2246 observed_mark_nmethods = (nmethod*)
2247 Atomic::cmpxchg_ptr(this, &_oops_do_mark_nmethods, required_mark_nmethods);
2248 if (observed_mark_nmethods == required_mark_nmethods)
2249 break;
2250 }
2251 // Mark was clear when we first saw this guy.
2252 if (TraceScavenge) { print_on(tty, "oops_do, mark"); }
2253 return false;
2254 }
2255 }
2256 // On fall through, another racing thread marked this nmethod before we did.
2257 return true;
2258 }
2259
2260 void nmethod::oops_do_marking_prologue() {
2261 if (TraceScavenge) { tty->print_cr("[oops_do_marking_prologue"); }
2262 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row");
2263 // We use cmpxchg_ptr instead of regular assignment here because the user
2264 // may fork a bunch of threads, and we need them all to see the same state.
2265 void* observed = Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, NULL);
2266 guarantee(observed == NULL, "no races in this sequential code");
2267 }
2268
2269 void nmethod::oops_do_marking_epilogue() {
2270 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row");
2271 nmethod* cur = _oops_do_mark_nmethods;
2272 while (cur != NMETHOD_SENTINEL) {
2273 assert(cur != NULL, "not NULL-terminated");
2274 nmethod* next = cur->_oops_do_mark_link;
2275 cur->_oops_do_mark_link = NULL;
2276 DEBUG_ONLY(cur->verify_oop_relocations());
2277 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark"));
2278 cur = next;
2279 }
2280 void* required = _oops_do_mark_nmethods;
2281 void* observed = Atomic::cmpxchg_ptr(NULL, &_oops_do_mark_nmethods, required);
2282 guarantee(observed == required, "no races in this sequential code");
2283 if (TraceScavenge) { tty->print_cr("oops_do_marking_epilogue]"); }
2284 }
2285
2286 class DetectScavengeRoot: public OopClosure {
2287 bool _detected_scavenge_root;
2288 public:
2289 DetectScavengeRoot() : _detected_scavenge_root(false)
2290 { NOT_PRODUCT(_print_nm = NULL); }
2291 bool detected_scavenge_root() { return _detected_scavenge_root; }
2292 virtual void do_oop(oop* p) {
2293 if ((*p) != NULL && (*p)->is_scavengable()) {
2294 NOT_PRODUCT(maybe_print(p));
2295 _detected_scavenge_root = true;
2296 }
2297 }
2298 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2299
2300 #ifndef PRODUCT
2301 nmethod* _print_nm;
2302 void maybe_print(oop* p) {
2303 if (_print_nm == NULL) return;
2304 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root");
2305 tty->print_cr("" PTR_FORMAT "[offset=%d] detected scavengable oop " PTR_FORMAT " (found at " PTR_FORMAT ")",
2306 p2i(_print_nm), (int)((intptr_t)p - (intptr_t)_print_nm),
2307 p2i(*p), p2i(p));
2308 (*p)->print();
2309 }
2310 #endif //PRODUCT
2311 };
2312
2313 bool nmethod::detect_scavenge_root_oops() {
2314 DetectScavengeRoot detect_scavenge_root;
2315 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this);
2316 oops_do(&detect_scavenge_root);
2317 return detect_scavenge_root.detected_scavenge_root();
2318 }
2319
2320 // Method that knows how to preserve outgoing arguments at call. This method must be
2321 // called with a frame corresponding to a Java invoke
2322 void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) {
2323 #ifndef SHARK
2324 if (method() != NULL && !method()->is_native()) {
2325 SimpleScopeDesc ssd(this, fr.pc());
2326 Bytecode_invoke call(ssd.method(), ssd.bci());
2327 bool has_receiver = call.has_receiver();
2328 bool has_appendix = call.has_appendix();
2329 Symbol* signature = call.signature();
2330 fr.oops_compiled_arguments_do(signature, has_receiver, has_appendix, reg_map, f);
2331 }
2332 #endif // !SHARK
2333 }
2334
2335 inline bool includes(void* p, void* from, void* to) {
2336 return from <= p && p < to;
2337 }
2338
2339
2340 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
2341 assert(count >= 2, "must be sentinel values, at least");
2342
2343 #ifdef ASSERT
2344 // must be sorted and unique; we do a binary search in find_pc_desc()
2345 int prev_offset = pcs[0].pc_offset();
2346 assert(prev_offset == PcDesc::lower_offset_limit,
2347 "must start with a sentinel");
2348 for (int i = 1; i < count; i++) {
2349 int this_offset = pcs[i].pc_offset();
2350 assert(this_offset > prev_offset, "offsets must be sorted");
2351 prev_offset = this_offset;
2352 }
2353 assert(prev_offset == PcDesc::upper_offset_limit,
2354 "must end with a sentinel");
2355 #endif //ASSERT
2356
2357 // Search for MethodHandle invokes and tag the nmethod.
2358 for (int i = 0; i < count; i++) {
2359 if (pcs[i].is_method_handle_invoke()) {
2360 set_has_method_handle_invokes(true);
2361 break;
2362 }
2363 }
2364 assert(has_method_handle_invokes() == (_deoptimize_mh_offset != -1), "must have deopt mh handler");
2365
2366 int size = count * sizeof(PcDesc);
2367 assert(scopes_pcs_size() >= size, "oob");
2368 memcpy(scopes_pcs_begin(), pcs, size);
2369
2370 // Adjust the final sentinel downward.
2371 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
2372 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
2373 last_pc->set_pc_offset(content_size() + 1);
2374 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
2375 // Fill any rounding gaps with copies of the last record.
2376 last_pc[1] = last_pc[0];
2377 }
2378 // The following assert could fail if sizeof(PcDesc) is not
2379 // an integral multiple of oopSize (the rounding term).
2380 // If it fails, change the logic to always allocate a multiple
2381 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
2382 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
2383 }
2384
2385 void nmethod::copy_scopes_data(u_char* buffer, int size) {
2386 assert(scopes_data_size() >= size, "oob");
2387 memcpy(scopes_data_begin(), buffer, size);
2388 }
2389
2390 // When using JVMCI the address might be off by the size of a call instruction.
2391 bool nmethod::is_deopt_entry(address pc) {
2392 return pc == deopt_handler_begin()
2393 #if INCLUDE_JVMCI
2394 || pc == (deopt_handler_begin() + NativeCall::instruction_size)
2395 #endif
2396 ;
2397 }
2398
2399 #ifdef ASSERT
2400 static PcDesc* linear_search(nmethod* nm, int pc_offset, bool approximate) {
2401 PcDesc* lower = nm->scopes_pcs_begin();
2402 PcDesc* upper = nm->scopes_pcs_end();
2403 lower += 1; // exclude initial sentinel
2404 PcDesc* res = NULL;
2405 for (PcDesc* p = lower; p < upper; p++) {
2406 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc
2407 if (match_desc(p, pc_offset, approximate)) {
2408 if (res == NULL)
2409 res = p;
2410 else
2411 res = (PcDesc*) badAddress;
2412 }
2413 }
2414 return res;
2415 }
2416 #endif
2417
2418
2419 // Finds a PcDesc with real-pc equal to "pc"
2420 PcDesc* nmethod::find_pc_desc_internal(address pc, bool approximate) {
2421 address base_address = code_begin();
2422 if ((pc < base_address) ||
2423 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
2424 return NULL; // PC is wildly out of range
2425 }
2426 int pc_offset = (int) (pc - base_address);
2427
2428 // Check the PcDesc cache if it contains the desired PcDesc
2429 // (This as an almost 100% hit rate.)
2430 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
2431 if (res != NULL) {
2432 assert(res == linear_search(this, pc_offset, approximate), "cache ok");
2433 return res;
2434 }
2435
2436 // Fallback algorithm: quasi-linear search for the PcDesc
2437 // Find the last pc_offset less than the given offset.
2438 // The successor must be the required match, if there is a match at all.
2439 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
2440 PcDesc* lower = scopes_pcs_begin();
2441 PcDesc* upper = scopes_pcs_end();
2442 upper -= 1; // exclude final sentinel
2443 if (lower >= upper) return NULL; // native method; no PcDescs at all
2444
2445 #define assert_LU_OK \
2446 /* invariant on lower..upper during the following search: */ \
2447 assert(lower->pc_offset() < pc_offset, "sanity"); \
2448 assert(upper->pc_offset() >= pc_offset, "sanity")
2449 assert_LU_OK;
2450
2451 // Use the last successful return as a split point.
2452 PcDesc* mid = _pc_desc_cache.last_pc_desc();
2453 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
2454 if (mid->pc_offset() < pc_offset) {
2455 lower = mid;
2456 } else {
2457 upper = mid;
2458 }
2459
2460 // Take giant steps at first (4096, then 256, then 16, then 1)
2461 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
2462 const int RADIX = (1 << LOG2_RADIX);
2463 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
2464 while ((mid = lower + step) < upper) {
2465 assert_LU_OK;
2466 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
2467 if (mid->pc_offset() < pc_offset) {
2468 lower = mid;
2469 } else {
2470 upper = mid;
2471 break;
2472 }
2473 }
2474 assert_LU_OK;
2475 }
2476
2477 // Sneak up on the value with a linear search of length ~16.
2478 while (true) {
2479 assert_LU_OK;
2480 mid = lower + 1;
2481 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
2482 if (mid->pc_offset() < pc_offset) {
2483 lower = mid;
2484 } else {
2485 upper = mid;
2486 break;
2487 }
2488 }
2489 #undef assert_LU_OK
2490
2491 if (match_desc(upper, pc_offset, approximate)) {
2492 assert(upper == linear_search(this, pc_offset, approximate), "search ok");
2493 _pc_desc_cache.add_pc_desc(upper);
2494 return upper;
2495 } else {
2496 assert(NULL == linear_search(this, pc_offset, approximate), "search ok");
2497 return NULL;
2498 }
2499 }
2500
2501
2502 void nmethod::check_all_dependencies(DepChange& changes) {
2503 // Checked dependencies are allocated into this ResourceMark
2504 ResourceMark rm;
2505
2506 // Turn off dependency tracing while actually testing dependencies.
2507 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) );
2508
2509 typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash,
2510 &DependencySignature::equals, 11027> DepTable;
2511
2512 DepTable* table = new DepTable();
2513
2514 // Iterate over live nmethods and check dependencies of all nmethods that are not
2515 // marked for deoptimization. A particular dependency is only checked once.
2516 NMethodIterator iter;
2517 while(iter.next()) {
2518 nmethod* nm = iter.method();
2519 // Only notify for live nmethods
2520 if (nm->is_alive() && !nm->is_marked_for_deoptimization()) {
2521 for (Dependencies::DepStream deps(nm); deps.next(); ) {
2522 // Construct abstraction of a dependency.
2523 DependencySignature* current_sig = new DependencySignature(deps);
2524
2525 // Determine if dependency is already checked. table->put(...) returns
2526 // 'true' if the dependency is added (i.e., was not in the hashtable).
2527 if (table->put(*current_sig, 1)) {
2528 if (deps.check_dependency() != NULL) {
2529 // Dependency checking failed. Print out information about the failed
2530 // dependency and finally fail with an assert. We can fail here, since
2531 // dependency checking is never done in a product build.
2532 tty->print_cr("Failed dependency:");
2533 changes.print();
2534 nm->print();
2535 nm->print_dependencies();
2536 assert(false, "Should have been marked for deoptimization");
2537 }
2538 }
2539 }
2540 }
2541 }
2542 }
2543
2544 bool nmethod::check_dependency_on(DepChange& changes) {
2545 // What has happened:
2546 // 1) a new class dependee has been added
2547 // 2) dependee and all its super classes have been marked
2548 bool found_check = false; // set true if we are upset
2549 for (Dependencies::DepStream deps(this); deps.next(); ) {
2550 // Evaluate only relevant dependencies.
2551 if (deps.spot_check_dependency_at(changes) != NULL) {
2552 found_check = true;
2553 NOT_DEBUG(break);
2554 }
2555 }
2556 return found_check;
2557 }
2558
2559 bool nmethod::is_evol_dependent_on(Klass* dependee) {
2560 InstanceKlass *dependee_ik = InstanceKlass::cast(dependee);
2561 Array<Method*>* dependee_methods = dependee_ik->methods();
2562 for (Dependencies::DepStream deps(this); deps.next(); ) {
2563 if (deps.type() == Dependencies::evol_method) {
2564 Method* method = deps.method_argument(0);
2565 for (int j = 0; j < dependee_methods->length(); j++) {
2566 if (dependee_methods->at(j) == method) {
2567 // RC_TRACE macro has an embedded ResourceMark
2568 RC_TRACE(0x01000000,
2569 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)",
2570 _method->method_holder()->external_name(),
2571 _method->name()->as_C_string(),
2572 _method->signature()->as_C_string(), compile_id(),
2573 method->method_holder()->external_name(),
2574 method->name()->as_C_string(),
2575 method->signature()->as_C_string()));
2576 if (TraceDependencies || LogCompilation)
2577 deps.log_dependency(dependee);
2578 return true;
2579 }
2580 }
2581 }
2582 }
2583 return false;
2584 }
2585
2586 // Called from mark_for_deoptimization, when dependee is invalidated.
2587 bool nmethod::is_dependent_on_method(Method* dependee) {
2588 for (Dependencies::DepStream deps(this); deps.next(); ) {
2589 if (deps.type() != Dependencies::evol_method)
2590 continue;
2591 Method* method = deps.method_argument(0);
2592 if (method == dependee) return true;
2593 }
2594 return false;
2595 }
2596
2597
2598 bool nmethod::is_patchable_at(address instr_addr) {
2599 assert(insts_contains(instr_addr), "wrong nmethod used");
2600 if (is_zombie()) {
2601 // a zombie may never be patched
2602 return false;
2603 }
2604 return true;
2605 }
2606
2607
2608 address nmethod::continuation_for_implicit_exception(address pc) {
2609 // Exception happened outside inline-cache check code => we are inside
2610 // an active nmethod => use cpc to determine a return address
2611 int exception_offset = pc - code_begin();
2612 int cont_offset = ImplicitExceptionTable(this).at( exception_offset );
2613 #ifdef ASSERT
2614 if (cont_offset == 0) {
2615 Thread* thread = Thread::current();
2616 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
2617 HandleMark hm(thread);
2618 ResourceMark rm(thread);
2619 CodeBlob* cb = CodeCache::find_blob(pc);
2620 assert(cb != NULL && cb == this, "");
2621 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, p2i(pc));
2622 print();
2623 method()->print_codes();
2624 print_code();
2625 print_pcs();
2626 }
2627 #endif
2628 if (cont_offset == 0) {
2629 // Let the normal error handling report the exception
2630 return NULL;
2631 }
2632 return code_begin() + cont_offset;
2633 }
2634
2635
2636
2637 void nmethod_init() {
2638 // make sure you didn't forget to adjust the filler fields
2639 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
2640 }
2641
2642
2643 //-------------------------------------------------------------------------------------------
2644
2645
2646 // QQQ might we make this work from a frame??
2647 nmethodLocker::nmethodLocker(address pc) {
2648 CodeBlob* cb = CodeCache::find_blob(pc);
2649 guarantee(cb != NULL && cb->is_nmethod(), "bad pc for a nmethod found");
2650 _nm = (nmethod*)cb;
2651 lock_nmethod(_nm);
2652 }
2653
2654 // Only JvmtiDeferredEvent::compiled_method_unload_event()
2655 // should pass zombie_ok == true.
2656 void nmethodLocker::lock_nmethod(nmethod* nm, bool zombie_ok) {
2657 if (nm == NULL) return;
2658 Atomic::inc(&nm->_lock_count);
2659 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method");
2660 }
2661
2662 void nmethodLocker::unlock_nmethod(nmethod* nm) {
2663 if (nm == NULL) return;
2664 Atomic::dec(&nm->_lock_count);
2665 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock");
2666 }
2667
2668 // -----------------------------------------------------------------------------
2669 // nmethod::get_deopt_original_pc
2670 //
2671 // Return the original PC for the given PC if:
2672 // (a) the given PC belongs to a nmethod and
2673 // (b) it is a deopt PC
2674 address nmethod::get_deopt_original_pc(const frame* fr) {
2675 if (fr->cb() == NULL) return NULL;
2676
2677 nmethod* nm = fr->cb()->as_nmethod_or_null();
2678 if (nm != NULL && nm->is_deopt_pc(fr->pc()))
2679 return nm->get_original_pc(fr);
2680
2681 return NULL;
2682 }
2683
2684
2685 // -----------------------------------------------------------------------------
2686 // MethodHandle
2687
2688 bool nmethod::is_method_handle_return(address return_pc) {
2689 if (!has_method_handle_invokes()) return false;
2690 PcDesc* pd = pc_desc_at(return_pc);
2691 if (pd == NULL)
2692 return false;
2693 return pd->is_method_handle_invoke();
2694 }
2695
2696
2697 // -----------------------------------------------------------------------------
2698 // Verification
2699
2700 class VerifyOopsClosure: public OopClosure {
2701 nmethod* _nm;
2702 bool _ok;
2703 public:
2704 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
2705 bool ok() { return _ok; }
2706 virtual void do_oop(oop* p) {
2707 if ((*p) == NULL || (*p)->is_oop()) return;
2708 if (_ok) {
2709 _nm->print_nmethod(true);
2710 _ok = false;
2711 }
2712 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2713 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2714 }
2715 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2716 };
2717
2718 void nmethod::verify() {
2719
2720 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant
2721 // seems odd.
2722
2723 if (is_zombie() || is_not_entrant() || is_unloaded())
2724 return;
2725
2726 // Make sure all the entry points are correctly aligned for patching.
2727 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
2728
2729 // assert(method()->is_oop(), "must be valid");
2730
2731 ResourceMark rm;
2732
2733 if (!CodeCache::contains(this)) {
2734 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this));
2735 }
2736
2737 if(is_native_method() )
2738 return;
2739
2740 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
2741 if (nm != this) {
2742 fatal("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this));
2743 }
2744
2745 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2746 if (! p->verify(this)) {
2747 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this));
2748 }
2749 }
2750
2751 VerifyOopsClosure voc(this);
2752 oops_do(&voc);
2753 assert(voc.ok(), "embedded oops must be OK");
2754 verify_scavenge_root_oops();
2755
2756 verify_scopes();
2757 }
2758
2759
2760 void nmethod::verify_interrupt_point(address call_site) {
2761 // Verify IC only when nmethod installation is finished.
2762 bool is_installed = (method()->code() == this) // nmethod is in state 'in_use' and installed
2763 || !this->is_in_use(); // nmethod is installed, but not in 'in_use' state
2764 if (is_installed) {
2765 Thread *cur = Thread::current();
2766 if (CompiledIC_lock->owner() == cur ||
2767 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) &&
2768 SafepointSynchronize::is_at_safepoint())) {
2769 CompiledIC_at(this, call_site);
2770 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
2771 } else {
2772 MutexLocker ml_verify (CompiledIC_lock);
2773 CompiledIC_at(this, call_site);
2774 }
2775 }
2776
2777 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address());
2778 assert(pd != NULL, "PcDesc must exist");
2779 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(),
2780 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(),
2781 pd->return_oop());
2782 !sd->is_top(); sd = sd->sender()) {
2783 sd->verify();
2784 }
2785 }
2786
2787 void nmethod::verify_scopes() {
2788 if( !method() ) return; // Runtime stubs have no scope
2789 if (method()->is_native()) return; // Ignore stub methods.
2790 // iterate through all interrupt point
2791 // and verify the debug information is valid.
2792 RelocIterator iter((nmethod*)this);
2793 while (iter.next()) {
2794 address stub = NULL;
2795 switch (iter.type()) {
2796 case relocInfo::virtual_call_type:
2797 verify_interrupt_point(iter.addr());
2798 break;
2799 case relocInfo::opt_virtual_call_type:
2800 stub = iter.opt_virtual_call_reloc()->static_stub();
2801 verify_interrupt_point(iter.addr());
2802 break;
2803 case relocInfo::static_call_type:
2804 stub = iter.static_call_reloc()->static_stub();
2805 //verify_interrupt_point(iter.addr());
2806 break;
2807 case relocInfo::runtime_call_type:
2808 address destination = iter.reloc()->value();
2809 // Right now there is no way to find out which entries support
2810 // an interrupt point. It would be nice if we had this
2811 // information in a table.
2812 break;
2813 }
2814 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section");
2815 }
2816 }
2817
2818
2819 // -----------------------------------------------------------------------------
2820 // Non-product code
2821 #ifndef PRODUCT
2822
2823 class DebugScavengeRoot: public OopClosure {
2824 nmethod* _nm;
2825 bool _ok;
2826 public:
2827 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { }
2828 bool ok() { return _ok; }
2829 virtual void do_oop(oop* p) {
2830 if ((*p) == NULL || !(*p)->is_scavengable()) return;
2831 if (_ok) {
2832 _nm->print_nmethod(true);
2833 _ok = false;
2834 }
2835 tty->print_cr("*** scavengable oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2836 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2837 (*p)->print();
2838 }
2839 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2840 };
2841
2842 void nmethod::verify_scavenge_root_oops() {
2843 if (UseG1GC) {
2844 return;
2845 }
2846
2847 if (!on_scavenge_root_list()) {
2848 // Actually look inside, to verify the claim that it's clean.
2849 DebugScavengeRoot debug_scavenge_root(this);
2850 oops_do(&debug_scavenge_root);
2851 if (!debug_scavenge_root.ok())
2852 fatal("found an unadvertised bad scavengable oop in the code cache");
2853 }
2854 assert(scavenge_root_not_marked(), "");
2855 }
2856
2857 #endif // PRODUCT
2858
2859 // Printing operations
2860
2861 void nmethod::print() const {
2862 ResourceMark rm;
2863 ttyLocker ttyl; // keep the following output all in one block
2864
2865 tty->print("Compiled method ");
2866
2867 if (is_compiled_by_c1()) {
2868 tty->print("(c1) ");
2869 } else if (is_compiled_by_c2()) {
2870 tty->print("(c2) ");
2871 } else if (is_compiled_by_shark()) {
2872 tty->print("(shark) ");
2873 } else if (is_compiled_by_jvmci()) {
2874 tty->print("(JVMCI) ");
2875 } else {
2876 tty->print("(nm) ");
2877 }
2878
2879 print_on(tty, NULL);
2880
2881 if (WizardMode) {
2882 tty->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this));
2883 tty->print(" for method " INTPTR_FORMAT , p2i(method()));
2884 tty->print(" { ");
2885 if (is_in_use()) tty->print("in_use ");
2886 if (is_not_entrant()) tty->print("not_entrant ");
2887 if (is_zombie()) tty->print("zombie ");
2888 if (is_unloaded()) tty->print("unloaded ");
2889 if (on_scavenge_root_list()) tty->print("scavenge_root ");
2890 tty->print_cr("}:");
2891 }
2892 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2893 p2i(this),
2894 p2i(this) + size(),
2895 size());
2896 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2897 p2i(relocation_begin()),
2898 p2i(relocation_end()),
2899 relocation_size());
2900 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2901 p2i(consts_begin()),
2902 p2i(consts_end()),
2903 consts_size());
2904 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2905 p2i(insts_begin()),
2906 p2i(insts_end()),
2907 insts_size());
2908 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2909 p2i(stub_begin()),
2910 p2i(stub_end()),
2911 stub_size());
2912 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2913 p2i(oops_begin()),
2914 p2i(oops_end()),
2915 oops_size());
2916 if (metadata_size () > 0) tty->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2917 p2i(metadata_begin()),
2918 p2i(metadata_end()),
2919 metadata_size());
2920 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2921 p2i(scopes_data_begin()),
2922 p2i(scopes_data_end()),
2923 scopes_data_size());
2924 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2925 p2i(scopes_pcs_begin()),
2926 p2i(scopes_pcs_end()),
2927 scopes_pcs_size());
2928 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2929 p2i(dependencies_begin()),
2930 p2i(dependencies_end()),
2931 dependencies_size());
2932 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2933 p2i(handler_table_begin()),
2934 p2i(handler_table_end()),
2935 handler_table_size());
2936 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2937 p2i(nul_chk_table_begin()),
2938 p2i(nul_chk_table_end()),
2939 nul_chk_table_size());
2940 }
2941
2942 void nmethod::print_code() {
2943 HandleMark hm;
2944 ResourceMark m;
2945 Disassembler::decode(this);
2946 }
2947
2948
2949 #ifndef PRODUCT
2950
2951 void nmethod::print_scopes() {
2952 // Find the first pc desc for all scopes in the code and print it.
2953 ResourceMark rm;
2954 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2955 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
2956 continue;
2957
2958 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
2959 while (sd != NULL) {
2960 sd->print_on(tty, p);
2961 sd = sd->sender();
2962 }
2963 }
2964 }
2965
2966 void nmethod::print_dependencies() {
2967 ResourceMark rm;
2968 ttyLocker ttyl; // keep the following output all in one block
2969 tty->print_cr("Dependencies:");
2970 for (Dependencies::DepStream deps(this); deps.next(); ) {
2971 deps.print_dependency();
2972 Klass* ctxk = deps.context_type();
2973 if (ctxk != NULL) {
2974 if (ctxk->is_instance_klass() && InstanceKlass::cast(ctxk)->is_dependent_nmethod(this)) {
2975 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name());
2976 }
2977 }
2978 deps.log_dependency(); // put it into the xml log also
2979 }
2980 }
2981
2982
2983 void nmethod::print_relocations() {
2984 ResourceMark m; // in case methods get printed via the debugger
2985 tty->print_cr("relocations:");
2986 RelocIterator iter(this);
2987 iter.print();
2988 if (UseRelocIndex) {
2989 jint* index_end = (jint*)relocation_end() - 1;
2990 jint index_size = *index_end;
2991 jint* index_start = (jint*)( (address)index_end - index_size );
2992 tty->print_cr(" index @" INTPTR_FORMAT ": index_size=%d", p2i(index_start), index_size);
2993 if (index_size > 0) {
2994 jint* ip;
2995 for (ip = index_start; ip+2 <= index_end; ip += 2)
2996 tty->print_cr(" (%d %d) addr=" INTPTR_FORMAT " @" INTPTR_FORMAT,
2997 ip[0],
2998 ip[1],
2999 p2i(header_end()+ip[0]),
3000 p2i(relocation_begin()-1+ip[1]));
3001 for (; ip < index_end; ip++)
3002 tty->print_cr(" (%d ?)", ip[0]);
3003 tty->print_cr(" @" INTPTR_FORMAT ": index_size=%d", p2i(ip), *ip);
3004 ip++;
3005 tty->print_cr("reloc_end @" INTPTR_FORMAT ":", p2i(ip));
3006 }
3007 }
3008 }
3009
3010
3011 void nmethod::print_pcs() {
3012 ResourceMark m; // in case methods get printed via debugger
3013 tty->print_cr("pc-bytecode offsets:");
3014 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
3015 p->print(this);
3016 }
3017 }
3018
3019 #endif // PRODUCT
3020
3021 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
3022 RelocIterator iter(this, begin, end);
3023 bool have_one = false;
3024 while (iter.next()) {
3025 have_one = true;
3026 switch (iter.type()) {
3027 case relocInfo::none: return "no_reloc";
3028 case relocInfo::oop_type: {
3029 stringStream st;
3030 oop_Relocation* r = iter.oop_reloc();
3031 oop obj = r->oop_value();
3032 st.print("oop(");
3033 if (obj == NULL) st.print("NULL");
3034 else obj->print_value_on(&st);
3035 st.print(")");
3036 return st.as_string();
3037 }
3038 case relocInfo::metadata_type: {
3039 stringStream st;
3040 metadata_Relocation* r = iter.metadata_reloc();
3041 Metadata* obj = r->metadata_value();
3042 st.print("metadata(");
3043 if (obj == NULL) st.print("NULL");
3044 else obj->print_value_on(&st);
3045 st.print(")");
3046 return st.as_string();
3047 }
3048 case relocInfo::runtime_call_type: {
3049 stringStream st;
3050 st.print("runtime_call");
3051 runtime_call_Relocation* r = iter.runtime_call_reloc();
3052 address dest = r->destination();
3053 CodeBlob* cb = CodeCache::find_blob(dest);
3054 if (cb != NULL) {
3055 st.print(" %s", cb->name());
3056 } else {
3057 ResourceMark rm;
3058 const int buflen = 1024;
3059 char* buf = NEW_RESOURCE_ARRAY(char, buflen);
3060 int offset;
3061 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) {
3062 st.print(" %s", buf);
3063 if (offset != 0) {
3064 st.print("+%d", offset);
3065 }
3066 }
3067 }
3068 return st.as_string();
3069 }
3070 case relocInfo::virtual_call_type: return "virtual_call";
3071 case relocInfo::opt_virtual_call_type: return "optimized virtual_call";
3072 case relocInfo::static_call_type: return "static_call";
3073 case relocInfo::static_stub_type: return "static_stub";
3074 case relocInfo::external_word_type: return "external_word";
3075 case relocInfo::internal_word_type: return "internal_word";
3076 case relocInfo::section_word_type: return "section_word";
3077 case relocInfo::poll_type: return "poll";
3078 case relocInfo::poll_return_type: return "poll_return";
3079 case relocInfo::type_mask: return "type_bit_mask";
3080 }
3081 }
3082 return have_one ? "other" : NULL;
3083 }
3084
3085 // Return a the last scope in (begin..end]
3086 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
3087 PcDesc* p = pc_desc_near(begin+1);
3088 if (p != NULL && p->real_pc(this) <= end) {
3089 return new ScopeDesc(this, p->scope_decode_offset(),
3090 p->obj_decode_offset(), p->should_reexecute(), p->rethrow_exception(),
3091 p->return_oop());
3092 }
3093 return NULL;
3094 }
3095
3096 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const {
3097 if (block_begin == entry_point()) stream->print_cr("[Entry Point]");
3098 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]");
3099 if (JVMCI_ONLY(_exception_offset >= 0 &&) block_begin == exception_begin()) stream->print_cr("[Exception Handler]");
3100 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]");
3101 if (JVMCI_ONLY(_deoptimize_offset >= 0 &&) block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]");
3102
3103 if (has_method_handle_invokes())
3104 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]");
3105
3106 if (block_begin == consts_begin()) stream->print_cr("[Constants]");
3107
3108 if (block_begin == entry_point()) {
3109 methodHandle m = method();
3110 if (m.not_null()) {
3111 stream->print(" # ");
3112 m->print_value_on(stream);
3113 stream->cr();
3114 }
3115 if (m.not_null() && !is_osr_method()) {
3116 ResourceMark rm;
3117 int sizeargs = m->size_of_parameters();
3118 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
3119 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
3120 {
3121 int sig_index = 0;
3122 if (!m->is_static())
3123 sig_bt[sig_index++] = T_OBJECT; // 'this'
3124 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) {
3125 BasicType t = ss.type();
3126 sig_bt[sig_index++] = t;
3127 if (type2size[t] == 2) {
3128 sig_bt[sig_index++] = T_VOID;
3129 } else {
3130 assert(type2size[t] == 1, "size is 1 or 2");
3131 }
3132 }
3133 assert(sig_index == sizeargs, "");
3134 }
3135 const char* spname = "sp"; // make arch-specific?
3136 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false);
3137 int stack_slot_offset = this->frame_size() * wordSize;
3138 int tab1 = 14, tab2 = 24;
3139 int sig_index = 0;
3140 int arg_index = (m->is_static() ? 0 : -1);
3141 bool did_old_sp = false;
3142 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) {
3143 bool at_this = (arg_index == -1);
3144 bool at_old_sp = false;
3145 BasicType t = (at_this ? T_OBJECT : ss.type());
3146 assert(t == sig_bt[sig_index], "sigs in sync");
3147 if (at_this)
3148 stream->print(" # this: ");
3149 else
3150 stream->print(" # parm%d: ", arg_index);
3151 stream->move_to(tab1);
3152 VMReg fst = regs[sig_index].first();
3153 VMReg snd = regs[sig_index].second();
3154 if (fst->is_reg()) {
3155 stream->print("%s", fst->name());
3156 if (snd->is_valid()) {
3157 stream->print(":%s", snd->name());
3158 }
3159 } else if (fst->is_stack()) {
3160 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
3161 if (offset == stack_slot_offset) at_old_sp = true;
3162 stream->print("[%s+0x%x]", spname, offset);
3163 } else {
3164 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
3165 }
3166 stream->print(" ");
3167 stream->move_to(tab2);
3168 stream->print("= ");
3169 if (at_this) {
3170 m->method_holder()->print_value_on(stream);
3171 } else {
3172 bool did_name = false;
3173 if (!at_this && ss.is_object()) {
3174 Symbol* name = ss.as_symbol_or_null();
3175 if (name != NULL) {
3176 name->print_value_on(stream);
3177 did_name = true;
3178 }
3179 }
3180 if (!did_name)
3181 stream->print("%s", type2name(t));
3182 }
3183 if (at_old_sp) {
3184 stream->print(" (%s of caller)", spname);
3185 did_old_sp = true;
3186 }
3187 stream->cr();
3188 sig_index += type2size[t];
3189 arg_index += 1;
3190 if (!at_this) ss.next();
3191 }
3192 if (!did_old_sp) {
3193 stream->print(" # ");
3194 stream->move_to(tab1);
3195 stream->print("[%s+0x%x]", spname, stack_slot_offset);
3196 stream->print(" (%s of caller)", spname);
3197 stream->cr();
3198 }
3199 }
3200 }
3201 }
3202
3203 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) {
3204 // First, find an oopmap in (begin, end].
3205 // We use the odd half-closed interval so that oop maps and scope descs
3206 // which are tied to the byte after a call are printed with the call itself.
3207 address base = code_begin();
3208 ImmutableOopMapSet* oms = oop_maps();
3209 if (oms != NULL) {
3210 for (int i = 0, imax = oms->count(); i < imax; i++) {
3211 const ImmutableOopMapPair* pair = oms->pair_at(i);
3212 const ImmutableOopMap* om = pair->get_from(oms);
3213 address pc = base + pair->pc_offset();
3214 if (pc > begin) {
3215 if (pc <= end) {
3216 st->move_to(column);
3217 st->print("; ");
3218 om->print_on(st);
3219 }
3220 break;
3221 }
3222 }
3223 }
3224
3225 // Print any debug info present at this pc.
3226 ScopeDesc* sd = scope_desc_in(begin, end);
3227 if (sd != NULL) {
3228 st->move_to(column);
3229 if (sd->bci() == SynchronizationEntryBCI) {
3230 st->print(";*synchronization entry");
3231 } else {
3232 if (sd->method() == NULL) {
3233 st->print("method is NULL");
3234 } else if (sd->method()->is_native()) {
3235 st->print("method is native");
3236 } else {
3237 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci());
3238 st->print(";*%s", Bytecodes::name(bc));
3239 switch (bc) {
3240 case Bytecodes::_invokevirtual:
3241 case Bytecodes::_invokespecial:
3242 case Bytecodes::_invokestatic:
3243 case Bytecodes::_invokeinterface:
3244 {
3245 Bytecode_invoke invoke(sd->method(), sd->bci());
3246 st->print(" ");
3247 if (invoke.name() != NULL)
3248 invoke.name()->print_symbol_on(st);
3249 else
3250 st->print("<UNKNOWN>");
3251 break;
3252 }
3253 case Bytecodes::_getfield:
3254 case Bytecodes::_putfield:
3255 case Bytecodes::_getstatic:
3256 case Bytecodes::_putstatic:
3257 {
3258 Bytecode_field field(sd->method(), sd->bci());
3259 st->print(" ");
3260 if (field.name() != NULL)
3261 field.name()->print_symbol_on(st);
3262 else
3263 st->print("<UNKNOWN>");
3264 }
3265 }
3266 }
3267 st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop());
3268 }
3269
3270 // Print all scopes
3271 for (;sd != NULL; sd = sd->sender()) {
3272 st->move_to(column);
3273 st->print("; -");
3274 if (sd->method() == NULL) {
3275 st->print("method is NULL");
3276 } else {
3277 sd->method()->print_short_name(st);
3278 }
3279 int lineno = sd->method()->line_number_from_bci(sd->bci());
3280 if (lineno != -1) {
3281 st->print("@%d (line %d)", sd->bci(), lineno);
3282 } else {
3283 st->print("@%d", sd->bci());
3284 }
3285 st->cr();
3286 }
3287 }
3288
3289 // Print relocation information
3290 const char* str = reloc_string_for(begin, end);
3291 if (str != NULL) {
3292 if (sd != NULL) st->cr();
3293 st->move_to(column);
3294 st->print("; {%s}", str);
3295 }
3296 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin());
3297 if (cont_offset != 0) {
3298 st->move_to(column);
3299 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset));
3300 }
3301
3302 }
3303
3304 #ifndef PRODUCT
3305
3306 void nmethod::print_value_on(outputStream* st) const {
3307 st->print("nmethod");
3308 print_on(st, NULL);
3309 }
3310
3311 void nmethod::print_calls(outputStream* st) {
3312 RelocIterator iter(this);
3313 while (iter.next()) {
3314 switch (iter.type()) {
3315 case relocInfo::virtual_call_type:
3316 case relocInfo::opt_virtual_call_type: {
3317 VerifyMutexLocker mc(CompiledIC_lock);
3318 CompiledIC_at(&iter)->print();
3319 break;
3320 }
3321 case relocInfo::static_call_type:
3322 st->print_cr("Static call at " INTPTR_FORMAT, p2i(iter.reloc()->addr()));
3323 compiledStaticCall_at(iter.reloc())->print();
3324 break;
3325 }
3326 }
3327 }
3328
3329 void nmethod::print_handler_table() {
3330 ExceptionHandlerTable(this).print();
3331 }
3332
3333 void nmethod::print_nul_chk_table() {
3334 ImplicitExceptionTable(this).print(code_begin());
3335 }
3336
3337 void nmethod::print_statistics() {
3338 ttyLocker ttyl;
3339 if (xtty != NULL) xtty->head("statistics type='nmethod'");
3340 native_nmethod_stats.print_native_nmethod_stats();
3341 #ifdef COMPILER1
3342 c1_java_nmethod_stats.print_nmethod_stats("C1");
3343 #endif
3344 #ifdef COMPILER2
3345 c2_java_nmethod_stats.print_nmethod_stats("C2");
3346 #endif
3347 #if INCLUDE_JVMCI
3348 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI");
3349 #endif
3350 #ifdef SHARK
3351 shark_java_nmethod_stats.print_nmethod_stats("Shark");
3352 #endif
3353 unknown_java_nmethod_stats.print_nmethod_stats("Unknown");
3354 DebugInformationRecorder::print_statistics();
3355 #ifndef PRODUCT
3356 pc_nmethod_stats.print_pc_stats();
3357 #endif
3358 Dependencies::print_statistics();
3359 if (xtty != NULL) xtty->tail("statistics");
3360 }
3361
3362 #endif // !PRODUCT
3363
3364 #if INCLUDE_JVMCI
3365 void nmethod::clear_jvmci_installed_code() {
3366 // This must be done carefully to maintain nmethod remembered sets properly
3367 BarrierSet* bs = Universe::heap()->barrier_set();
3368 bs->write_ref_nmethod_pre(&_jvmci_installed_code, this);
3369 _jvmci_installed_code = NULL;
3370 bs->write_ref_nmethod_post(&_jvmci_installed_code, this);
3371 }
3372
3373 void nmethod::maybe_invalidate_installed_code() {
3374 if (_jvmci_installed_code != NULL) {
3375 if (!is_alive()) {
3376 // Break the link between nmethod and InstalledCode such that the nmethod
3377 // can subsequently be flushed safely. The link must be maintained while
3378 // the method could have live activations since invalidateInstalledCode
3379 // might want to invalidate all existing activations.
3380 InstalledCode::set_address(_jvmci_installed_code, 0);
3381 InstalledCode::set_entryPoint(_jvmci_installed_code, 0);
3382 clear_jvmci_installed_code();
3383 } else if (is_not_entrant()) {
3384 InstalledCode::set_entryPoint(_jvmci_installed_code, 0);
3385 }
3386 }
3387 }
3388
3389 char* nmethod::jvmci_installed_code_name(char* buf, size_t buflen) {
3390 if (!this->is_compiled_by_jvmci()) {
3391 return NULL;
3392 }
3393 oop installedCode = this->jvmci_installed_code();
3394 if (installedCode != NULL) {
3395 oop installedCodeName = NULL;
3396 if (installedCode->is_a(InstalledCode::klass())) {
3397 installedCodeName = InstalledCode::name(installedCode);
3398 }
3399 if (installedCodeName != NULL) {
3400 return java_lang_String::as_utf8_string(installedCodeName, buf, (int)buflen);
3401 } else {
3402 jio_snprintf(buf, buflen, "null");
3403 return buf;
3404 }
3405 }
3406 jio_snprintf(buf, buflen, "noInstalledCode");
3407 return buf;
3408 }
3409 #endif