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/directivesParser.hpp"
37 #include "compiler/disassembler.hpp"
38 #include "interpreter/bytecode.hpp"
39 #include "oops/methodData.hpp"
40 #include "oops/oop.inline.hpp"
41 #include "prims/jvmtiRedefineClassesTrace.hpp"
42 #include "prims/jvmtiImpl.hpp"
43 #include "runtime/atomic.inline.hpp"
44 #include "runtime/orderAccess.inline.hpp"
45 #include "runtime/os.hpp"
46 #include "runtime/sharedRuntime.hpp"
47 #include "runtime/sweeper.hpp"
48 #include "utilities/resourceHash.hpp"
49 #include "utilities/dtrace.hpp"
50 #include "utilities/events.hpp"
51 #include "utilities/xmlstream.hpp"
52 #include "logging/log.hpp"
53 #ifdef TARGET_ARCH_x86
54 # include "nativeInst_x86.hpp"
55 #endif
56 #ifdef TARGET_ARCH_sparc
57 # include "nativeInst_sparc.hpp"
58 #endif
59 #ifdef TARGET_ARCH_zero
60 # include "nativeInst_zero.hpp"
61 #endif
62 #ifdef TARGET_ARCH_arm
63 # include "nativeInst_arm.hpp"
64 #endif
65 #ifdef TARGET_ARCH_ppc
66 # include "nativeInst_ppc.hpp"
67 #endif
68 #ifdef SHARK
69 #include "shark/sharkCompiler.hpp"
70 #endif
71 #if INCLUDE_JVMCI
72 #include "jvmci/jvmciJavaClasses.hpp"
73 #endif
74
75 unsigned char nmethod::_global_unloading_clock = 0;
76
77 #ifdef DTRACE_ENABLED
78
79 // Only bother with this argument setup if dtrace is available
80
81 #define DTRACE_METHOD_UNLOAD_PROBE(method) \
82 { \
83 Method* m = (method); \
84 if (m != NULL) { \
85 Symbol* klass_name = m->klass_name(); \
86 Symbol* name = m->name(); \
87 Symbol* signature = m->signature(); \
88 HOTSPOT_COMPILED_METHOD_UNLOAD( \
89 (char *) klass_name->bytes(), klass_name->utf8_length(), \
90 (char *) name->bytes(), name->utf8_length(), \
91 (char *) signature->bytes(), signature->utf8_length()); \
92 } \
93 }
94
95 #else // ndef DTRACE_ENABLED
96
97 #define DTRACE_METHOD_UNLOAD_PROBE(method)
98
99 #endif
100
101 bool nmethod::is_compiled_by_c1() const {
102 if (compiler() == NULL) {
103 return false;
104 }
105 return compiler()->is_c1();
106 }
107 bool nmethod::is_compiled_by_jvmci() const {
108 if (compiler() == NULL || method() == NULL) return false; // can happen during debug printing
109 if (is_native_method()) return false;
110 return compiler()->is_jvmci();
111 }
112 bool nmethod::is_compiled_by_c2() const {
113 if (compiler() == NULL) {
114 return false;
115 }
116 return compiler()->is_c2();
117 }
118 bool nmethod::is_compiled_by_shark() const {
119 if (compiler() == NULL) {
120 return false;
121 }
122 return compiler()->is_shark();
123 }
124
125
126
127 //---------------------------------------------------------------------------------
128 // NMethod statistics
129 // They are printed under various flags, including:
130 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation.
131 // (In the latter two cases, they like other stats are printed to the log only.)
132
133 #ifndef PRODUCT
134 // These variables are put into one block to reduce relocations
135 // and make it simpler to print from the debugger.
136 struct java_nmethod_stats_struct {
137 int nmethod_count;
138 int total_size;
139 int relocation_size;
140 int consts_size;
141 int insts_size;
142 int stub_size;
143 int scopes_data_size;
144 int scopes_pcs_size;
145 int dependencies_size;
146 int handler_table_size;
147 int nul_chk_table_size;
148 int oops_size;
149 int metadata_size;
150
151 void note_nmethod(nmethod* nm) {
152 nmethod_count += 1;
153 total_size += nm->size();
154 relocation_size += nm->relocation_size();
155 consts_size += nm->consts_size();
156 insts_size += nm->insts_size();
157 stub_size += nm->stub_size();
158 oops_size += nm->oops_size();
159 metadata_size += nm->metadata_size();
160 scopes_data_size += nm->scopes_data_size();
161 scopes_pcs_size += nm->scopes_pcs_size();
162 dependencies_size += nm->dependencies_size();
163 handler_table_size += nm->handler_table_size();
164 nul_chk_table_size += nm->nul_chk_table_size();
165 }
166 void print_nmethod_stats(const char* name) {
167 if (nmethod_count == 0) return;
168 tty->print_cr("Statistics for %d bytecoded nmethods for %s:", nmethod_count, name);
169 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size);
170 if (nmethod_count != 0) tty->print_cr(" header = " SIZE_FORMAT, nmethod_count * sizeof(nmethod));
171 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size);
172 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size);
173 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size);
174 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size);
175 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size);
176 if (metadata_size != 0) tty->print_cr(" metadata = %d", metadata_size);
177 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size);
178 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size);
179 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size);
180 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size);
181 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size);
182 }
183 };
184
185 struct native_nmethod_stats_struct {
186 int native_nmethod_count;
187 int native_total_size;
188 int native_relocation_size;
189 int native_insts_size;
190 int native_oops_size;
191 int native_metadata_size;
192 void note_native_nmethod(nmethod* nm) {
193 native_nmethod_count += 1;
194 native_total_size += nm->size();
195 native_relocation_size += nm->relocation_size();
196 native_insts_size += nm->insts_size();
197 native_oops_size += nm->oops_size();
198 native_metadata_size += nm->metadata_size();
199 }
200 void print_native_nmethod_stats() {
201 if (native_nmethod_count == 0) return;
202 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count);
203 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size);
204 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size);
205 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size);
206 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size);
207 if (native_metadata_size != 0) tty->print_cr(" N. metadata = %d", native_metadata_size);
208 }
209 };
210
211 struct pc_nmethod_stats_struct {
212 int pc_desc_resets; // number of resets (= number of caches)
213 int pc_desc_queries; // queries to nmethod::find_pc_desc
214 int pc_desc_approx; // number of those which have approximate true
215 int pc_desc_repeats; // number of _pc_descs[0] hits
216 int pc_desc_hits; // number of LRU cache hits
217 int pc_desc_tests; // total number of PcDesc examinations
218 int pc_desc_searches; // total number of quasi-binary search steps
219 int pc_desc_adds; // number of LUR cache insertions
220
221 void print_pc_stats() {
222 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query",
223 pc_desc_queries,
224 (double)(pc_desc_tests + pc_desc_searches)
225 / pc_desc_queries);
226 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d",
227 pc_desc_resets,
228 pc_desc_queries, pc_desc_approx,
229 pc_desc_repeats, pc_desc_hits,
230 pc_desc_tests, pc_desc_searches, pc_desc_adds);
231 }
232 };
233
234 #ifdef COMPILER1
235 static java_nmethod_stats_struct c1_java_nmethod_stats;
236 #endif
237 #ifdef COMPILER2
238 static java_nmethod_stats_struct c2_java_nmethod_stats;
239 #endif
240 #if INCLUDE_JVMCI
241 static java_nmethod_stats_struct jvmci_java_nmethod_stats;
242 #endif
243 #ifdef SHARK
244 static java_nmethod_stats_struct shark_java_nmethod_stats;
245 #endif
246 static java_nmethod_stats_struct unknown_java_nmethod_stats;
247
248 static native_nmethod_stats_struct native_nmethod_stats;
249 static pc_nmethod_stats_struct pc_nmethod_stats;
250
251 static void note_java_nmethod(nmethod* nm) {
252 #ifdef COMPILER1
253 if (nm->is_compiled_by_c1()) {
254 c1_java_nmethod_stats.note_nmethod(nm);
255 } else
256 #endif
257 #ifdef COMPILER2
258 if (nm->is_compiled_by_c2()) {
259 c2_java_nmethod_stats.note_nmethod(nm);
260 } else
261 #endif
262 #if INCLUDE_JVMCI
263 if (nm->is_compiled_by_jvmci()) {
264 jvmci_java_nmethod_stats.note_nmethod(nm);
265 } else
266 #endif
267 #ifdef SHARK
268 if (nm->is_compiled_by_shark()) {
269 shark_java_nmethod_stats.note_nmethod(nm);
270 } else
271 #endif
272 {
273 unknown_java_nmethod_stats.note_nmethod(nm);
274 }
275 }
276 #endif // !PRODUCT
277
278 //---------------------------------------------------------------------------------
279
280
281 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) {
282 assert(pc != NULL, "Must be non null");
283 assert(exception.not_null(), "Must be non null");
284 assert(handler != NULL, "Must be non null");
285
286 _count = 0;
287 _exception_type = exception->klass();
288 _next = NULL;
289
290 add_address_and_handler(pc,handler);
291 }
292
293
294 address ExceptionCache::match(Handle exception, address pc) {
295 assert(pc != NULL,"Must be non null");
296 assert(exception.not_null(),"Must be non null");
297 if (exception->klass() == exception_type()) {
298 return (test_address(pc));
299 }
300
301 return NULL;
302 }
303
304
305 bool ExceptionCache::match_exception_with_space(Handle exception) {
306 assert(exception.not_null(),"Must be non null");
307 if (exception->klass() == exception_type() && count() < cache_size) {
308 return true;
309 }
310 return false;
311 }
312
313
314 address ExceptionCache::test_address(address addr) {
315 for (int i=0; i<count(); i++) {
316 if (pc_at(i) == addr) {
317 return handler_at(i);
318 }
319 }
320 return NULL;
321 }
322
323
324 bool ExceptionCache::add_address_and_handler(address addr, address handler) {
325 if (test_address(addr) == handler) return true;
326
327 int index = count();
328 if (index < cache_size) {
329 set_pc_at(index, addr);
330 set_handler_at(index, handler);
331 OrderAccess::storestore();
332 increment_count();
333 return true;
334 }
335 return false;
336 }
337
338
339 // private method for handling exception cache
340 // These methods are private, and used to manipulate the exception cache
341 // directly.
342 ExceptionCache* nmethod::exception_cache_entry_for_exception(Handle exception) {
343 ExceptionCache* ec = exception_cache();
344 while (ec != NULL) {
345 if (ec->match_exception_with_space(exception)) {
346 return ec;
347 }
348 ec = ec->next();
349 }
350 return NULL;
351 }
352
353
354 //-----------------------------------------------------------------------------
355
356
357 // Helper used by both find_pc_desc methods.
358 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) {
359 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_tests);
360 if (!approximate)
361 return pc->pc_offset() == pc_offset;
362 else
363 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset();
364 }
365
366 void PcDescCache::reset_to(PcDesc* initial_pc_desc) {
367 if (initial_pc_desc == NULL) {
368 _pc_descs[0] = NULL; // native method; no PcDescs at all
369 return;
370 }
371 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_resets);
372 // reset the cache by filling it with benign (non-null) values
373 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel");
374 for (int i = 0; i < cache_size; i++)
375 _pc_descs[i] = initial_pc_desc;
376 }
377
378 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) {
379 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_queries);
380 NOT_PRODUCT(if (approximate) ++pc_nmethod_stats.pc_desc_approx);
381
382 // Note: one might think that caching the most recently
383 // read value separately would be a win, but one would be
384 // wrong. When many threads are updating it, the cache
385 // line it's in would bounce between caches, negating
386 // any benefit.
387
388 // In order to prevent race conditions do not load cache elements
389 // repeatedly, but use a local copy:
390 PcDesc* res;
391
392 // Step one: Check the most recently added value.
393 res = _pc_descs[0];
394 if (res == NULL) return NULL; // native method; no PcDescs at all
395 if (match_desc(res, pc_offset, approximate)) {
396 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_repeats);
397 return res;
398 }
399
400 // Step two: Check the rest of the LRU cache.
401 for (int i = 1; i < cache_size; ++i) {
402 res = _pc_descs[i];
403 if (res->pc_offset() < 0) break; // optimization: skip empty cache
404 if (match_desc(res, pc_offset, approximate)) {
405 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_hits);
406 return res;
407 }
408 }
409
410 // Report failure.
411 return NULL;
412 }
413
414 void PcDescCache::add_pc_desc(PcDesc* pc_desc) {
415 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_adds);
416 // Update the LRU cache by shifting pc_desc forward.
417 for (int i = 0; i < cache_size; i++) {
418 PcDesc* next = _pc_descs[i];
419 _pc_descs[i] = pc_desc;
420 pc_desc = next;
421 }
422 }
423
424 // adjust pcs_size so that it is a multiple of both oopSize and
425 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple
426 // of oopSize, then 2*sizeof(PcDesc) is)
427 static int adjust_pcs_size(int pcs_size) {
428 int nsize = round_to(pcs_size, oopSize);
429 if ((nsize % sizeof(PcDesc)) != 0) {
430 nsize = pcs_size + sizeof(PcDesc);
431 }
432 assert((nsize % oopSize) == 0, "correct alignment");
433 return nsize;
434 }
435
436 //-----------------------------------------------------------------------------
437
438
439 void nmethod::add_exception_cache_entry(ExceptionCache* new_entry) {
440 assert(ExceptionCache_lock->owned_by_self(),"Must hold the ExceptionCache_lock");
441 assert(new_entry != NULL,"Must be non null");
442 assert(new_entry->next() == NULL, "Must be null");
443
444 if (exception_cache() != NULL) {
445 new_entry->set_next(exception_cache());
446 }
447 set_exception_cache(new_entry);
448 }
449
450 void nmethod::clean_exception_cache(BoolObjectClosure* is_alive) {
451 ExceptionCache* prev = NULL;
452 ExceptionCache* curr = exception_cache();
453
454 while (curr != NULL) {
455 ExceptionCache* next = curr->next();
456
457 Klass* ex_klass = curr->exception_type();
458 if (ex_klass != NULL && !ex_klass->is_loader_alive(is_alive)) {
459 if (prev == NULL) {
460 set_exception_cache(next);
461 } else {
462 prev->set_next(next);
463 }
464 delete curr;
465 // prev stays the same.
466 } else {
467 prev = curr;
468 }
469
470 curr = next;
471 }
472 }
473
474 // public method for accessing the exception cache
475 // These are the public access methods.
476 address nmethod::handler_for_exception_and_pc(Handle exception, address pc) {
477 // We never grab a lock to read the exception cache, so we may
478 // have false negatives. This is okay, as it can only happen during
479 // the first few exception lookups for a given nmethod.
480 ExceptionCache* ec = exception_cache();
481 while (ec != NULL) {
482 address ret_val;
483 if ((ret_val = ec->match(exception,pc)) != NULL) {
484 return ret_val;
485 }
486 ec = ec->next();
487 }
488 return NULL;
489 }
490
491
492 void nmethod::add_handler_for_exception_and_pc(Handle exception, address pc, address handler) {
493 // There are potential race conditions during exception cache updates, so we
494 // must own the ExceptionCache_lock before doing ANY modifications. Because
495 // we don't lock during reads, it is possible to have several threads attempt
496 // to update the cache with the same data. We need to check for already inserted
497 // copies of the current data before adding it.
498
499 MutexLocker ml(ExceptionCache_lock);
500 ExceptionCache* target_entry = exception_cache_entry_for_exception(exception);
501
502 if (target_entry == NULL || !target_entry->add_address_and_handler(pc,handler)) {
503 target_entry = new ExceptionCache(exception,pc,handler);
504 add_exception_cache_entry(target_entry);
505 }
506 }
507
508
509 //-------------end of code for ExceptionCache--------------
510
511
512 int nmethod::total_size() const {
513 return
514 consts_size() +
515 insts_size() +
516 stub_size() +
517 scopes_data_size() +
518 scopes_pcs_size() +
519 handler_table_size() +
520 nul_chk_table_size();
521 }
522
523 const char* nmethod::compile_kind() const {
524 if (is_osr_method()) return "osr";
525 if (method() != NULL && is_native_method()) return "c2n";
526 return NULL;
527 }
528
529 // Fill in default values for various flag fields
530 void nmethod::init_defaults() {
531 _state = in_use;
532 _unloading_clock = 0;
533 _has_flushed_dependencies = 0;
534 _has_unsafe_access = 0;
535 _has_method_handle_invokes = 0;
536 _lazy_critical_native = 0;
537 _has_wide_vectors = 0;
538 _mark_for_deoptimization_status = not_marked;
539 _lock_count = 0;
540 _stack_traversal_mark = 0;
541 _unload_reported = false; // jvmti state
542
543 #ifdef ASSERT
544 _oops_are_stale = false;
545 #endif
546
547 _oops_do_mark_link = NULL;
548 _jmethod_id = NULL;
549 _osr_link = NULL;
550 if (UseG1GC) {
551 _unloading_next = NULL;
552 } else {
553 _scavenge_root_link = NULL;
554 }
555 _scavenge_root_state = 0;
556 _compiler = NULL;
557 #if INCLUDE_RTM_OPT
558 _rtm_state = NoRTM;
559 #endif
560 #if INCLUDE_JVMCI
561 _jvmci_installed_code = NULL;
562 _speculation_log = NULL;
563 #endif
564 }
565
566 nmethod* nmethod::new_native_nmethod(const methodHandle& method,
567 int compile_id,
568 CodeBuffer *code_buffer,
569 int vep_offset,
570 int frame_complete,
571 int frame_size,
572 ByteSize basic_lock_owner_sp_offset,
573 ByteSize basic_lock_sp_offset,
574 OopMapSet* oop_maps) {
575 code_buffer->finalize_oop_references(method);
576 // create nmethod
577 nmethod* nm = NULL;
578 {
579 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
580 int native_nmethod_size = allocation_size(code_buffer, sizeof(nmethod));
581 CodeOffsets offsets;
582 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
583 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
584 nm = new (native_nmethod_size, CompLevel_none) nmethod(method(), native_nmethod_size,
585 compile_id, &offsets,
586 code_buffer, frame_size,
587 basic_lock_owner_sp_offset,
588 basic_lock_sp_offset, oop_maps);
589 NOT_PRODUCT(if (nm != NULL) native_nmethod_stats.note_native_nmethod(nm));
590 }
591 // verify nmethod
592 debug_only(if (nm) nm->verify();) // might block
593
594 if (nm != NULL) {
595 nm->log_new_nmethod();
596 }
597
598 return nm;
599 }
600
601 nmethod* nmethod::new_nmethod(const methodHandle& method,
602 int compile_id,
603 int entry_bci,
604 CodeOffsets* offsets,
605 int orig_pc_offset,
606 DebugInformationRecorder* debug_info,
607 Dependencies* dependencies,
608 CodeBuffer* code_buffer, int frame_size,
609 OopMapSet* oop_maps,
610 ExceptionHandlerTable* handler_table,
611 ImplicitExceptionTable* nul_chk_table,
612 AbstractCompiler* compiler,
613 int comp_level
614 #if INCLUDE_JVMCI
615 , Handle installed_code,
616 Handle speculationLog
617 #endif
618 )
619 {
620 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
621 code_buffer->finalize_oop_references(method);
622 // create nmethod
623 nmethod* nm = NULL;
624 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
625 int nmethod_size =
626 allocation_size(code_buffer, sizeof(nmethod))
627 + adjust_pcs_size(debug_info->pcs_size())
628 + round_to(dependencies->size_in_bytes() , oopSize)
629 + round_to(handler_table->size_in_bytes(), oopSize)
630 + round_to(nul_chk_table->size_in_bytes(), oopSize)
631 + round_to(debug_info->data_size() , oopSize);
632
633 nm = new (nmethod_size, comp_level)
634 nmethod(method(), nmethod_size, compile_id, entry_bci, offsets,
635 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size,
636 oop_maps,
637 handler_table,
638 nul_chk_table,
639 compiler,
640 comp_level
641 #if INCLUDE_JVMCI
642 , installed_code,
643 speculationLog
644 #endif
645 );
646
647 if (nm != NULL) {
648 // To make dependency checking during class loading fast, record
649 // the nmethod dependencies in the classes it is dependent on.
650 // This allows the dependency checking code to simply walk the
651 // class hierarchy above the loaded class, checking only nmethods
652 // which are dependent on those classes. The slow way is to
653 // check every nmethod for dependencies which makes it linear in
654 // the number of methods compiled. For applications with a lot
655 // classes the slow way is too slow.
656 for (Dependencies::DepStream deps(nm); deps.next(); ) {
657 if (deps.type() == Dependencies::call_site_target_value) {
658 // CallSite dependencies are managed on per-CallSite instance basis.
659 oop call_site = deps.argument_oop(0);
660 MethodHandles::add_dependent_nmethod(call_site, nm);
661 } else {
662 Klass* klass = deps.context_type();
663 if (klass == NULL) {
664 continue; // ignore things like evol_method
665 }
666 // record this nmethod as dependent on this klass
667 InstanceKlass::cast(klass)->add_dependent_nmethod(nm);
668 }
669 }
670 NOT_PRODUCT(if (nm != NULL) note_java_nmethod(nm));
671 }
672 }
673 // Do verification and logging outside CodeCache_lock.
674 if (nm != NULL) {
675 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
676 DEBUG_ONLY(nm->verify();)
677 nm->log_new_nmethod();
678 }
679 return nm;
680 }
681
682 // For native wrappers
683 nmethod::nmethod(
684 Method* method,
685 int nmethod_size,
686 int compile_id,
687 CodeOffsets* offsets,
688 CodeBuffer* code_buffer,
689 int frame_size,
690 ByteSize basic_lock_owner_sp_offset,
691 ByteSize basic_lock_sp_offset,
692 OopMapSet* oop_maps )
693 : CodeBlob("native nmethod", code_buffer, sizeof(nmethod),
694 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps),
695 _native_receiver_sp_offset(basic_lock_owner_sp_offset),
696 _native_basic_lock_sp_offset(basic_lock_sp_offset)
697 {
698 {
699 debug_only(NoSafepointVerifier nsv;)
700 assert_locked_or_safepoint(CodeCache_lock);
701
702 init_defaults();
703 _method = method;
704 _entry_bci = InvocationEntryBci;
705 // We have no exception handler or deopt handler make the
706 // values something that will never match a pc like the nmethod vtable entry
707 _exception_offset = 0;
708 _deoptimize_offset = 0;
709 _deoptimize_mh_offset = 0;
710 _orig_pc_offset = 0;
711
712 _consts_offset = data_offset();
713 _stub_offset = data_offset();
714 _oops_offset = data_offset();
715 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize);
716 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize);
717 _scopes_pcs_offset = _scopes_data_offset;
718 _dependencies_offset = _scopes_pcs_offset;
719 _handler_table_offset = _dependencies_offset;
720 _nul_chk_table_offset = _handler_table_offset;
721 _nmethod_end_offset = _nul_chk_table_offset;
722 _compile_id = compile_id;
723 _comp_level = CompLevel_none;
724 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
725 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
726 _osr_entry_point = NULL;
727 _exception_cache = NULL;
728 _pc_desc_cache.reset_to(NULL);
729 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
730
731 code_buffer->copy_values_to(this);
732 if (ScavengeRootsInCode) {
733 if (detect_scavenge_root_oops()) {
734 CodeCache::add_scavenge_root_nmethod(this);
735 }
736 Universe::heap()->register_nmethod(this);
737 }
738 debug_only(verify_scavenge_root_oops());
739 CodeCache::commit(this);
740 }
741
742 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
743 ttyLocker ttyl; // keep the following output all in one block
744 // This output goes directly to the tty, not the compiler log.
745 // To enable tools to match it up with the compilation activity,
746 // be sure to tag this tty output with the compile ID.
747 if (xtty != NULL) {
748 xtty->begin_head("print_native_nmethod");
749 xtty->method(_method);
750 xtty->stamp();
751 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
752 }
753 // print the header part first
754 print();
755 // then print the requested information
756 if (PrintNativeNMethods) {
757 print_code();
758 if (oop_maps != NULL) {
759 oop_maps->print();
760 }
761 }
762 if (PrintRelocations) {
763 print_relocations();
764 }
765 if (xtty != NULL) {
766 xtty->tail("print_native_nmethod");
767 }
768 }
769 }
770
771 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () {
772 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level));
773 }
774
775 nmethod::nmethod(
776 Method* method,
777 int nmethod_size,
778 int compile_id,
779 int entry_bci,
780 CodeOffsets* offsets,
781 int orig_pc_offset,
782 DebugInformationRecorder* debug_info,
783 Dependencies* dependencies,
784 CodeBuffer *code_buffer,
785 int frame_size,
786 OopMapSet* oop_maps,
787 ExceptionHandlerTable* handler_table,
788 ImplicitExceptionTable* nul_chk_table,
789 AbstractCompiler* compiler,
790 int comp_level
791 #if INCLUDE_JVMCI
792 , Handle installed_code,
793 Handle speculation_log
794 #endif
795 )
796 : CodeBlob("nmethod", code_buffer, sizeof(nmethod),
797 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps),
798 _native_receiver_sp_offset(in_ByteSize(-1)),
799 _native_basic_lock_sp_offset(in_ByteSize(-1))
800 {
801 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
802 {
803 debug_only(NoSafepointVerifier nsv;)
804 assert_locked_or_safepoint(CodeCache_lock);
805
806 init_defaults();
807 _method = method;
808 _entry_bci = entry_bci;
809 _compile_id = compile_id;
810 _comp_level = comp_level;
811 _compiler = compiler;
812 _orig_pc_offset = orig_pc_offset;
813 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
814
815 // Section offsets
816 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts());
817 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs());
818
819 #if INCLUDE_JVMCI
820 _jvmci_installed_code = installed_code();
821 _speculation_log = (instanceOop)speculation_log();
822
823 if (compiler->is_jvmci()) {
824 // JVMCI might not produce any stub sections
825 if (offsets->value(CodeOffsets::Exceptions) != -1) {
826 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions);
827 } else {
828 _exception_offset = -1;
829 }
830 if (offsets->value(CodeOffsets::Deopt) != -1) {
831 _deoptimize_offset = code_offset() + offsets->value(CodeOffsets::Deopt);
832 } else {
833 _deoptimize_offset = -1;
834 }
835 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
836 _deoptimize_mh_offset = code_offset() + offsets->value(CodeOffsets::DeoptMH);
837 } else {
838 _deoptimize_mh_offset = -1;
839 }
840 } else {
841 #endif
842 // Exception handler and deopt handler are in the stub section
843 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set");
844 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set");
845
846 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
847 _deoptimize_offset = _stub_offset + offsets->value(CodeOffsets::Deopt);
848 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
849 _deoptimize_mh_offset = _stub_offset + offsets->value(CodeOffsets::DeoptMH);
850 } else {
851 _deoptimize_mh_offset = -1;
852 #if INCLUDE_JVMCI
853 }
854 #endif
855 }
856 if (offsets->value(CodeOffsets::UnwindHandler) != -1) {
857 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler);
858 } else {
859 _unwind_handler_offset = -1;
860 }
861
862 _oops_offset = data_offset();
863 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize);
864 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize);
865
866 _scopes_pcs_offset = _scopes_data_offset + round_to(debug_info->data_size (), oopSize);
867 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
868 _handler_table_offset = _dependencies_offset + round_to(dependencies->size_in_bytes (), oopSize);
869 _nul_chk_table_offset = _handler_table_offset + round_to(handler_table->size_in_bytes(), oopSize);
870 _nmethod_end_offset = _nul_chk_table_offset + round_to(nul_chk_table->size_in_bytes(), oopSize);
871
872 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
873 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
874 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry);
875 _exception_cache = NULL;
876 _pc_desc_cache.reset_to(scopes_pcs_begin());
877
878 // Copy contents of ScopeDescRecorder to nmethod
879 code_buffer->copy_values_to(this);
880 debug_info->copy_to(this);
881 dependencies->copy_to(this);
882 if (ScavengeRootsInCode) {
883 if (detect_scavenge_root_oops()) {
884 CodeCache::add_scavenge_root_nmethod(this);
885 }
886 Universe::heap()->register_nmethod(this);
887 }
888 debug_only(verify_scavenge_root_oops());
889
890 CodeCache::commit(this);
891
892 // Copy contents of ExceptionHandlerTable to nmethod
893 handler_table->copy_to(this);
894 nul_chk_table->copy_to(this);
895
896 // we use the information of entry points to find out if a method is
897 // static or non static
898 assert(compiler->is_c2() || compiler->is_jvmci() ||
899 _method->is_static() == (entry_point() == _verified_entry_point),
900 " entry points must be same for static methods and vice versa");
901 }
902 }
903
904 // Print a short set of xml attributes to identify this nmethod. The
905 // output should be embedded in some other element.
906 void nmethod::log_identity(xmlStream* log) const {
907 log->print(" compile_id='%d'", compile_id());
908 const char* nm_kind = compile_kind();
909 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind);
910 if (compiler() != NULL) {
911 log->print(" compiler='%s'", compiler()->name());
912 }
913 if (TieredCompilation) {
914 log->print(" level='%d'", comp_level());
915 }
916 }
917
918
919 #define LOG_OFFSET(log, name) \
920 if (p2i(name##_end()) - p2i(name##_begin())) \
921 log->print(" " XSTR(name) "_offset='" INTX_FORMAT "'" , \
922 p2i(name##_begin()) - p2i(this))
923
924
925 void nmethod::log_new_nmethod() const {
926 if (LogCompilation && xtty != NULL) {
927 ttyLocker ttyl;
928 HandleMark hm;
929 xtty->begin_elem("nmethod");
930 log_identity(xtty);
931 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size());
932 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this));
933
934 LOG_OFFSET(xtty, relocation);
935 LOG_OFFSET(xtty, consts);
936 LOG_OFFSET(xtty, insts);
937 LOG_OFFSET(xtty, stub);
938 LOG_OFFSET(xtty, scopes_data);
939 LOG_OFFSET(xtty, scopes_pcs);
940 LOG_OFFSET(xtty, dependencies);
941 LOG_OFFSET(xtty, handler_table);
942 LOG_OFFSET(xtty, nul_chk_table);
943 LOG_OFFSET(xtty, oops);
944 LOG_OFFSET(xtty, metadata);
945
946 xtty->method(method());
947 xtty->stamp();
948 xtty->end_elem();
949 }
950 }
951
952 #undef LOG_OFFSET
953
954
955 // Print out more verbose output usually for a newly created nmethod.
956 void nmethod::print_on(outputStream* st, const char* msg) const {
957 if (st != NULL) {
958 ttyLocker ttyl;
959 if (WizardMode) {
960 CompileTask::print(st, this, msg, /*short_form:*/ true);
961 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this));
962 } else {
963 CompileTask::print(st, this, msg, /*short_form:*/ false);
964 }
965 }
966 }
967
968 void nmethod::maybe_print_nmethod(DirectiveSet* directive) {
969 bool printnmethods = directive->PrintAssemblyOption || directive->PrintNMethodsOption;
970 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
971 print_nmethod(printnmethods);
972 }
973 }
974
975 void nmethod::print_nmethod(bool printmethod) {
976 ttyLocker ttyl; // keep the following output all in one block
977 if (xtty != NULL) {
978 xtty->begin_head("print_nmethod");
979 xtty->stamp();
980 xtty->end_head();
981 }
982 // print the header part first
983 print();
984 // then print the requested information
985 if (printmethod) {
986 print_code();
987 print_pcs();
988 if (oop_maps()) {
989 oop_maps()->print();
990 }
991 }
992 if (printmethod || PrintDebugInfo || CompilerOracle::has_option_string(_method, "PrintDebugInfo")) {
993 print_scopes();
994 }
995 if (printmethod || PrintRelocations || CompilerOracle::has_option_string(_method, "PrintRelocations")) {
996 print_relocations();
997 }
998 if (printmethod || PrintDependencies || CompilerOracle::has_option_string(_method, "PrintDependencies")) {
999 print_dependencies();
1000 }
1001 if (printmethod || PrintExceptionHandlers) {
1002 print_handler_table();
1003 print_nul_chk_table();
1004 }
1005 if (printmethod) {
1006 print_recorded_oops();
1007 print_recorded_metadata();
1008 }
1009 if (xtty != NULL) {
1010 xtty->tail("print_nmethod");
1011 }
1012 }
1013
1014
1015 // Promote one word from an assembly-time handle to a live embedded oop.
1016 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
1017 if (handle == NULL ||
1018 // As a special case, IC oops are initialized to 1 or -1.
1019 handle == (jobject) Universe::non_oop_word()) {
1020 (*dest) = (oop) handle;
1021 } else {
1022 (*dest) = JNIHandles::resolve_non_null(handle);
1023 }
1024 }
1025
1026
1027 // Have to have the same name because it's called by a template
1028 void nmethod::copy_values(GrowableArray<jobject>* array) {
1029 int length = array->length();
1030 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
1031 oop* dest = oops_begin();
1032 for (int index = 0 ; index < length; index++) {
1033 initialize_immediate_oop(&dest[index], array->at(index));
1034 }
1035
1036 // Now we can fix up all the oops in the code. We need to do this
1037 // in the code because the assembler uses jobjects as placeholders.
1038 // The code and relocations have already been initialized by the
1039 // CodeBlob constructor, so it is valid even at this early point to
1040 // iterate over relocations and patch the code.
1041 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true);
1042 }
1043
1044 void nmethod::copy_values(GrowableArray<Metadata*>* array) {
1045 int length = array->length();
1046 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough");
1047 Metadata** dest = metadata_begin();
1048 for (int index = 0 ; index < length; index++) {
1049 dest[index] = array->at(index);
1050 }
1051 }
1052
1053 bool nmethod::is_at_poll_return(address pc) {
1054 RelocIterator iter(this, pc, pc+1);
1055 while (iter.next()) {
1056 if (iter.type() == relocInfo::poll_return_type)
1057 return true;
1058 }
1059 return false;
1060 }
1061
1062
1063 bool nmethod::is_at_poll_or_poll_return(address pc) {
1064 RelocIterator iter(this, pc, pc+1);
1065 while (iter.next()) {
1066 relocInfo::relocType t = iter.type();
1067 if (t == relocInfo::poll_return_type || t == relocInfo::poll_type)
1068 return true;
1069 }
1070 return false;
1071 }
1072
1073
1074 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) {
1075 // re-patch all oop-bearing instructions, just in case some oops moved
1076 RelocIterator iter(this, begin, end);
1077 while (iter.next()) {
1078 if (iter.type() == relocInfo::oop_type) {
1079 oop_Relocation* reloc = iter.oop_reloc();
1080 if (initialize_immediates && reloc->oop_is_immediate()) {
1081 oop* dest = reloc->oop_addr();
1082 initialize_immediate_oop(dest, (jobject) *dest);
1083 }
1084 // Refresh the oop-related bits of this instruction.
1085 reloc->fix_oop_relocation();
1086 } else if (iter.type() == relocInfo::metadata_type) {
1087 metadata_Relocation* reloc = iter.metadata_reloc();
1088 reloc->fix_metadata_relocation();
1089 }
1090 }
1091 }
1092
1093
1094 void nmethod::verify_oop_relocations() {
1095 // Ensure sure that the code matches the current oop values
1096 RelocIterator iter(this, NULL, NULL);
1097 while (iter.next()) {
1098 if (iter.type() == relocInfo::oop_type) {
1099 oop_Relocation* reloc = iter.oop_reloc();
1100 if (!reloc->oop_is_immediate()) {
1101 reloc->verify_oop_relocation();
1102 }
1103 }
1104 }
1105 }
1106
1107
1108 ScopeDesc* nmethod::scope_desc_at(address pc) {
1109 PcDesc* pd = pc_desc_at(pc);
1110 guarantee(pd != NULL, "scope must be present");
1111 return new ScopeDesc(this, pd->scope_decode_offset(),
1112 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(),
1113 pd->return_oop());
1114 }
1115
1116
1117 void nmethod::clear_inline_caches() {
1118 assert(SafepointSynchronize::is_at_safepoint(), "cleaning of IC's only allowed at safepoint");
1119 if (is_zombie()) {
1120 return;
1121 }
1122
1123 RelocIterator iter(this);
1124 while (iter.next()) {
1125 iter.reloc()->clear_inline_cache();
1126 }
1127 }
1128
1129 // Clear ICStubs of all compiled ICs
1130 void nmethod::clear_ic_stubs() {
1131 assert_locked_or_safepoint(CompiledIC_lock);
1132 RelocIterator iter(this);
1133 while(iter.next()) {
1134 if (iter.type() == relocInfo::virtual_call_type) {
1135 CompiledIC* ic = CompiledIC_at(&iter);
1136 ic->clear_ic_stub();
1137 }
1138 }
1139 }
1140
1141 void nmethod::cleanup_inline_caches(bool clean_all/*=false*/) {
1142 assert_locked_or_safepoint(CompiledIC_lock);
1143
1144 // If the method is not entrant or zombie then a JMP is plastered over the
1145 // first few bytes. If an oop in the old code was there, that oop
1146 // should not get GC'd. Skip the first few bytes of oops on
1147 // not-entrant methods.
1148 address low_boundary = verified_entry_point();
1149 if (!is_in_use()) {
1150 low_boundary += NativeJump::instruction_size;
1151 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1152 // This means that the low_boundary is going to be a little too high.
1153 // This shouldn't matter, since oops of non-entrant methods are never used.
1154 // In fact, why are we bothering to look at oops in a non-entrant method??
1155 }
1156
1157 // Find all calls in an nmethod and clear the ones that point to non-entrant,
1158 // zombie and unloaded nmethods.
1159 ResourceMark rm;
1160 RelocIterator iter(this, low_boundary);
1161 while(iter.next()) {
1162 switch(iter.type()) {
1163 case relocInfo::virtual_call_type:
1164 case relocInfo::opt_virtual_call_type: {
1165 CompiledIC *ic = CompiledIC_at(&iter);
1166 // Ok, to lookup references to zombies here
1167 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
1168 if( cb != NULL && cb->is_nmethod() ) {
1169 nmethod* nm = (nmethod*)cb;
1170 // Clean inline caches pointing to zombie, non-entrant and unloaded methods
1171 if (clean_all || !nm->is_in_use() || (nm->method()->code() != nm)) ic->set_to_clean(is_alive());
1172 }
1173 break;
1174 }
1175 case relocInfo::static_call_type: {
1176 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
1177 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
1178 if( cb != NULL && cb->is_nmethod() ) {
1179 nmethod* nm = (nmethod*)cb;
1180 // Clean inline caches pointing to zombie, non-entrant and unloaded methods
1181 if (clean_all || !nm->is_in_use() || (nm->method()->code() != nm)) csc->set_to_clean();
1182 }
1183 break;
1184 }
1185 }
1186 }
1187 }
1188
1189 void nmethod::verify_clean_inline_caches() {
1190 assert_locked_or_safepoint(CompiledIC_lock);
1191
1192 // If the method is not entrant or zombie then a JMP is plastered over the
1193 // first few bytes. If an oop in the old code was there, that oop
1194 // should not get GC'd. Skip the first few bytes of oops on
1195 // not-entrant methods.
1196 address low_boundary = verified_entry_point();
1197 if (!is_in_use()) {
1198 low_boundary += NativeJump::instruction_size;
1199 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1200 // This means that the low_boundary is going to be a little too high.
1201 // This shouldn't matter, since oops of non-entrant methods are never used.
1202 // In fact, why are we bothering to look at oops in a non-entrant method??
1203 }
1204
1205 ResourceMark rm;
1206 RelocIterator iter(this, low_boundary);
1207 while(iter.next()) {
1208 switch(iter.type()) {
1209 case relocInfo::virtual_call_type:
1210 case relocInfo::opt_virtual_call_type: {
1211 CompiledIC *ic = CompiledIC_at(&iter);
1212 // Ok, to lookup references to zombies here
1213 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_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(ic->is_clean(), "IC should be clean");
1219 }
1220 }
1221 break;
1222 }
1223 case relocInfo::static_call_type: {
1224 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
1225 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
1226 if( cb != NULL && cb->is_nmethod() ) {
1227 nmethod* nm = (nmethod*)cb;
1228 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
1229 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1230 assert(csc->is_clean(), "IC should be clean");
1231 }
1232 }
1233 break;
1234 }
1235 }
1236 }
1237 }
1238
1239 int nmethod::verify_icholder_relocations() {
1240 int count = 0;
1241
1242 RelocIterator iter(this);
1243 while(iter.next()) {
1244 if (iter.type() == relocInfo::virtual_call_type) {
1245 if (CompiledIC::is_icholder_call_site(iter.virtual_call_reloc())) {
1246 CompiledIC *ic = CompiledIC_at(&iter);
1247 if (TraceCompiledIC) {
1248 tty->print("noticed icholder " INTPTR_FORMAT " ", p2i(ic->cached_icholder()));
1249 ic->print();
1250 }
1251 assert(ic->cached_icholder() != NULL, "must be non-NULL");
1252 count++;
1253 }
1254 }
1255 }
1256
1257 return count;
1258 }
1259
1260 // This is a private interface with the sweeper.
1261 void nmethod::mark_as_seen_on_stack() {
1262 assert(is_alive(), "Must be an alive method");
1263 // Set the traversal mark to ensure that the sweeper does 2
1264 // cleaning passes before moving to zombie.
1265 set_stack_traversal_mark(NMethodSweeper::traversal_count());
1266 }
1267
1268 // Tell if a non-entrant method can be converted to a zombie (i.e.,
1269 // there are no activations on the stack, not in use by the VM,
1270 // and not in use by the ServiceThread)
1271 bool nmethod::can_convert_to_zombie() {
1272 assert(is_not_entrant(), "must be a non-entrant method");
1273
1274 // Since the nmethod sweeper only does partial sweep the sweeper's traversal
1275 // count can be greater than the stack traversal count before it hits the
1276 // nmethod for the second time.
1277 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count() &&
1278 !is_locked_by_vm();
1279 }
1280
1281 void nmethod::inc_decompile_count() {
1282 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return;
1283 // Could be gated by ProfileTraps, but do not bother...
1284 Method* m = method();
1285 if (m == NULL) return;
1286 MethodData* mdo = m->method_data();
1287 if (mdo == NULL) return;
1288 // There is a benign race here. See comments in methodData.hpp.
1289 mdo->inc_decompile_count();
1290 }
1291
1292 void nmethod::increase_unloading_clock() {
1293 _global_unloading_clock++;
1294 if (_global_unloading_clock == 0) {
1295 // _nmethods are allocated with _unloading_clock == 0,
1296 // so 0 is never used as a clock value.
1297 _global_unloading_clock = 1;
1298 }
1299 }
1300
1301 void nmethod::set_unloading_clock(unsigned char unloading_clock) {
1302 OrderAccess::release_store((volatile jubyte*)&_unloading_clock, unloading_clock);
1303 }
1304
1305 unsigned char nmethod::unloading_clock() {
1306 return (unsigned char)OrderAccess::load_acquire((volatile jubyte*)&_unloading_clock);
1307 }
1308
1309 void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) {
1310
1311 post_compiled_method_unload();
1312
1313 // Since this nmethod is being unloaded, make sure that dependencies
1314 // recorded in instanceKlasses get flushed and pass non-NULL closure to
1315 // indicate that this work is being done during a GC.
1316 assert(Universe::heap()->is_gc_active(), "should only be called during gc");
1317 assert(is_alive != NULL, "Should be non-NULL");
1318 // A non-NULL is_alive closure indicates that this is being called during GC.
1319 flush_dependencies(is_alive);
1320
1321 // Break cycle between nmethod & method
1322 if (log_is_enabled(Trace, classunload)) {
1323 outputStream* log = LogHandle(classunload)::trace_stream();
1324 log->print_cr("making nmethod " INTPTR_FORMAT
1325 " unloadable, Method*(" INTPTR_FORMAT
1326 "), cause(" INTPTR_FORMAT ")",
1327 p2i(this), p2i(_method), p2i(cause));
1328 if (!Universe::heap()->is_gc_active())
1329 cause->klass()->print_on(log);
1330 }
1331 // Unlink the osr method, so we do not look this up again
1332 if (is_osr_method()) {
1333 // Invalidate the osr nmethod only once
1334 if (is_in_use()) {
1335 invalidate_osr_method();
1336 }
1337 #ifdef ASSERT
1338 if (method() != NULL) {
1339 // Make sure osr nmethod is invalidated, i.e. not on the list
1340 bool found = method()->method_holder()->remove_osr_nmethod(this);
1341 assert(!found, "osr nmethod should have been invalidated");
1342 }
1343 #endif
1344 }
1345
1346 // If _method is already NULL the Method* is about to be unloaded,
1347 // so we don't have to break the cycle. Note that it is possible to
1348 // have the Method* live here, in case we unload the nmethod because
1349 // it is pointing to some oop (other than the Method*) being unloaded.
1350 if (_method != NULL) {
1351 // OSR methods point to the Method*, but the Method* does not
1352 // point back!
1353 if (_method->code() == this) {
1354 _method->clear_code(); // Break a cycle
1355 }
1356 _method = NULL; // Clear the method of this dead nmethod
1357 }
1358
1359 // Make the class unloaded - i.e., change state and notify sweeper
1360 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
1361 if (is_in_use()) {
1362 // Transitioning directly from live to unloaded -- so
1363 // we need to force a cache clean-up; remember this
1364 // for later on.
1365 CodeCache::set_needs_cache_clean(true);
1366 }
1367
1368 // Unregister must be done before the state change
1369 Universe::heap()->unregister_nmethod(this);
1370
1371 _state = unloaded;
1372
1373 // Log the unloading.
1374 log_state_change();
1375
1376 #if INCLUDE_JVMCI
1377 // The method can only be unloaded after the pointer to the installed code
1378 // Java wrapper is no longer alive. Here we need to clear out this weak
1379 // reference to the dead object. Nulling out the reference has to happen
1380 // after the method is unregistered since the original value may be still
1381 // tracked by the rset.
1382 maybe_invalidate_installed_code();
1383 // Clear these out after the nmethod has been unregistered and any
1384 // updates to the InstalledCode instance have been performed.
1385 _jvmci_installed_code = NULL;
1386 _speculation_log = NULL;
1387 #endif
1388
1389 // The Method* is gone at this point
1390 assert(_method == NULL, "Tautology");
1391
1392 set_osr_link(NULL);
1393 NMethodSweeper::report_state_change(this);
1394 }
1395
1396 void nmethod::invalidate_osr_method() {
1397 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
1398 // Remove from list of active nmethods
1399 if (method() != NULL) {
1400 method()->method_holder()->remove_osr_nmethod(this);
1401 }
1402 }
1403
1404 void nmethod::log_state_change() const {
1405 if (LogCompilation) {
1406 if (xtty != NULL) {
1407 ttyLocker ttyl; // keep the following output all in one block
1408 if (_state == unloaded) {
1409 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'",
1410 os::current_thread_id());
1411 } else {
1412 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s",
1413 os::current_thread_id(),
1414 (_state == zombie ? " zombie='1'" : ""));
1415 }
1416 log_identity(xtty);
1417 xtty->stamp();
1418 xtty->end_elem();
1419 }
1420 }
1421 if (PrintCompilation && _state != unloaded) {
1422 print_on(tty, _state == zombie ? "made zombie" : "made not entrant");
1423 }
1424 }
1425
1426 /**
1427 * Common functionality for both make_not_entrant and make_zombie
1428 */
1429 bool nmethod::make_not_entrant_or_zombie(unsigned int state) {
1430 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant");
1431 assert(!is_zombie(), "should not already be a zombie");
1432
1433 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below.
1434 nmethodLocker nml(this);
1435 methodHandle the_method(method());
1436 NoSafepointVerifier nsv;
1437
1438 // during patching, depending on the nmethod state we must notify the GC that
1439 // code has been unloaded, unregistering it. We cannot do this right while
1440 // holding the Patching_lock because we need to use the CodeCache_lock. This
1441 // would be prone to deadlocks.
1442 // This flag is used to remember whether we need to later lock and unregister.
1443 bool nmethod_needs_unregister = false;
1444
1445 {
1446 // invalidate osr nmethod before acquiring the patching lock since
1447 // they both acquire leaf locks and we don't want a deadlock.
1448 // This logic is equivalent to the logic below for patching the
1449 // verified entry point of regular methods. We check that the
1450 // nmethod is in use to ensure that it is invalidated only once.
1451 if (is_osr_method() && is_in_use()) {
1452 // this effectively makes the osr nmethod not entrant
1453 invalidate_osr_method();
1454 }
1455
1456 // Enter critical section. Does not block for safepoint.
1457 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1458
1459 if (_state == state) {
1460 // another thread already performed this transition so nothing
1461 // to do, but return false to indicate this.
1462 return false;
1463 }
1464
1465 // The caller can be calling the method statically or through an inline
1466 // cache call.
1467 if (!is_osr_method() && !is_not_entrant()) {
1468 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
1469 SharedRuntime::get_handle_wrong_method_stub());
1470 }
1471
1472 if (is_in_use() && update_recompile_counts()) {
1473 // It's a true state change, so mark the method as decompiled.
1474 // Do it only for transition from alive.
1475 inc_decompile_count();
1476 }
1477
1478 // If the state is becoming a zombie, signal to unregister the nmethod with
1479 // the heap.
1480 // This nmethod may have already been unloaded during a full GC.
1481 if ((state == zombie) && !is_unloaded()) {
1482 nmethod_needs_unregister = true;
1483 }
1484
1485 // Must happen before state change. Otherwise we have a race condition in
1486 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately
1487 // transition its state from 'not_entrant' to 'zombie' without having to wait
1488 // for stack scanning.
1489 if (state == not_entrant) {
1490 mark_as_seen_on_stack();
1491 OrderAccess::storestore();
1492 }
1493
1494 // Change state
1495 _state = state;
1496
1497 // Log the transition once
1498 log_state_change();
1499
1500 // Invalidate while holding the patching lock
1501 JVMCI_ONLY(maybe_invalidate_installed_code());
1502
1503 // Remove nmethod from method.
1504 // We need to check if both the _code and _from_compiled_code_entry_point
1505 // refer to this nmethod because there is a race in setting these two fields
1506 // in Method* as seen in bugid 4947125.
1507 // If the vep() points to the zombie nmethod, the memory for the nmethod
1508 // could be flushed and the compiler and vtable stubs could still call
1509 // through it.
1510 if (method() != NULL && (method()->code() == this ||
1511 method()->from_compiled_entry() == verified_entry_point())) {
1512 HandleMark hm;
1513 method()->clear_code();
1514 }
1515 } // leave critical region under Patching_lock
1516
1517 #ifdef ASSERT
1518 if (is_osr_method() && method() != NULL) {
1519 // Make sure osr nmethod is invalidated, i.e. not on the list
1520 bool found = method()->method_holder()->remove_osr_nmethod(this);
1521 assert(!found, "osr nmethod should have been invalidated");
1522 }
1523 #endif
1524
1525 // When the nmethod becomes zombie it is no longer alive so the
1526 // dependencies must be flushed. nmethods in the not_entrant
1527 // state will be flushed later when the transition to zombie
1528 // happens or they get unloaded.
1529 if (state == zombie) {
1530 {
1531 // Flushing dependencies must be done before any possible
1532 // safepoint can sneak in, otherwise the oops used by the
1533 // dependency logic could have become stale.
1534 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1535 if (nmethod_needs_unregister) {
1536 Universe::heap()->unregister_nmethod(this);
1537 #ifdef JVMCI
1538 _jvmci_installed_code = NULL;
1539 _speculation_log = NULL;
1540 #endif
1541 }
1542 flush_dependencies(NULL);
1543 }
1544
1545 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload
1546 // event and it hasn't already been reported for this nmethod then
1547 // report it now. The event may have been reported earlier if the GC
1548 // marked it for unloading). JvmtiDeferredEventQueue support means
1549 // we no longer go to a safepoint here.
1550 post_compiled_method_unload();
1551
1552 #ifdef ASSERT
1553 // It's no longer safe to access the oops section since zombie
1554 // nmethods aren't scanned for GC.
1555 _oops_are_stale = true;
1556 #endif
1557 // the Method may be reclaimed by class unloading now that the
1558 // nmethod is in zombie state
1559 set_method(NULL);
1560 } else {
1561 assert(state == not_entrant, "other cases may need to be handled differently");
1562 }
1563
1564 if (TraceCreateZombies) {
1565 ResourceMark m;
1566 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");
1567 }
1568
1569 NMethodSweeper::report_state_change(this);
1570 return true;
1571 }
1572
1573 void nmethod::flush() {
1574 // Note that there are no valid oops in the nmethod anymore.
1575 assert(!is_osr_method() || is_unloaded() || is_zombie(),
1576 "osr nmethod must be unloaded or zombie before flushing");
1577 assert(is_zombie() || is_osr_method(), "must be a zombie method");
1578 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed");
1579 assert_locked_or_safepoint(CodeCache_lock);
1580
1581 // completely deallocate this method
1582 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, p2i(this));
1583 if (PrintMethodFlushing) {
1584 tty->print_cr("*flushing %s nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT
1585 "/Free CodeCache:" SIZE_FORMAT "Kb",
1586 is_osr_method() ? "osr" : "",_compile_id, p2i(this), CodeCache::blob_count(),
1587 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024);
1588 }
1589
1590 // We need to deallocate any ExceptionCache data.
1591 // Note that we do not need to grab the nmethod lock for this, it
1592 // better be thread safe if we're disposing of it!
1593 ExceptionCache* ec = exception_cache();
1594 set_exception_cache(NULL);
1595 while(ec != NULL) {
1596 ExceptionCache* next = ec->next();
1597 delete ec;
1598 ec = next;
1599 }
1600
1601 if (on_scavenge_root_list()) {
1602 CodeCache::drop_scavenge_root_nmethod(this);
1603 }
1604
1605 #ifdef SHARK
1606 ((SharkCompiler *) compiler())->free_compiled_method(insts_begin());
1607 #endif // SHARK
1608
1609 ((CodeBlob*)(this))->flush();
1610
1611 CodeCache::free(this);
1612 }
1613
1614 //
1615 // Notify all classes this nmethod is dependent on that it is no
1616 // longer dependent. This should only be called in two situations.
1617 // First, when a nmethod transitions to a zombie all dependents need
1618 // to be clear. Since zombification happens at a safepoint there's no
1619 // synchronization issues. The second place is a little more tricky.
1620 // During phase 1 of mark sweep class unloading may happen and as a
1621 // result some nmethods may get unloaded. In this case the flushing
1622 // of dependencies must happen during phase 1 since after GC any
1623 // dependencies in the unloaded nmethod won't be updated, so
1624 // traversing the dependency information in unsafe. In that case this
1625 // function is called with a non-NULL argument and this function only
1626 // notifies instanceKlasses that are reachable
1627
1628 void nmethod::flush_dependencies(BoolObjectClosure* is_alive) {
1629 assert_locked_or_safepoint(CodeCache_lock);
1630 assert(Universe::heap()->is_gc_active() == (is_alive != NULL),
1631 "is_alive is non-NULL if and only if we are called during GC");
1632 if (!has_flushed_dependencies()) {
1633 set_has_flushed_dependencies();
1634 for (Dependencies::DepStream deps(this); deps.next(); ) {
1635 if (deps.type() == Dependencies::call_site_target_value) {
1636 // CallSite dependencies are managed on per-CallSite instance basis.
1637 oop call_site = deps.argument_oop(0);
1638 MethodHandles::remove_dependent_nmethod(call_site, this);
1639 } else {
1640 Klass* klass = deps.context_type();
1641 if (klass == NULL) {
1642 continue; // ignore things like evol_method
1643 }
1644 // During GC the is_alive closure is non-NULL, and is used to
1645 // determine liveness of dependees that need to be updated.
1646 if (is_alive == NULL || klass->is_loader_alive(is_alive)) {
1647 // The GC defers deletion of this entry, since there might be multiple threads
1648 // iterating over the _dependencies graph. Other call paths are single-threaded
1649 // and may delete it immediately.
1650 bool delete_immediately = is_alive == NULL;
1651 InstanceKlass::cast(klass)->remove_dependent_nmethod(this, delete_immediately);
1652 }
1653 }
1654 }
1655 }
1656 }
1657
1658
1659 // If this oop is not live, the nmethod can be unloaded.
1660 bool nmethod::can_unload(BoolObjectClosure* is_alive, oop* root, bool unloading_occurred) {
1661 assert(root != NULL, "just checking");
1662 oop obj = *root;
1663 if (obj == NULL || is_alive->do_object_b(obj)) {
1664 return false;
1665 }
1666
1667 // If ScavengeRootsInCode is true, an nmethod might be unloaded
1668 // simply because one of its constant oops has gone dead.
1669 // No actual classes need to be unloaded in order for this to occur.
1670 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading");
1671 make_unloaded(is_alive, obj);
1672 return true;
1673 }
1674
1675 // ------------------------------------------------------------------
1676 // post_compiled_method_load_event
1677 // new method for install_code() path
1678 // Transfer information from compilation to jvmti
1679 void nmethod::post_compiled_method_load_event() {
1680
1681 Method* moop = method();
1682 HOTSPOT_COMPILED_METHOD_LOAD(
1683 (char *) moop->klass_name()->bytes(),
1684 moop->klass_name()->utf8_length(),
1685 (char *) moop->name()->bytes(),
1686 moop->name()->utf8_length(),
1687 (char *) moop->signature()->bytes(),
1688 moop->signature()->utf8_length(),
1689 insts_begin(), insts_size());
1690
1691 if (JvmtiExport::should_post_compiled_method_load() ||
1692 JvmtiExport::should_post_compiled_method_unload()) {
1693 get_and_cache_jmethod_id();
1694 }
1695
1696 if (JvmtiExport::should_post_compiled_method_load()) {
1697 // Let the Service thread (which is a real Java thread) post the event
1698 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1699 JvmtiDeferredEventQueue::enqueue(
1700 JvmtiDeferredEvent::compiled_method_load_event(this));
1701 }
1702 }
1703
1704 jmethodID nmethod::get_and_cache_jmethod_id() {
1705 if (_jmethod_id == NULL) {
1706 // Cache the jmethod_id since it can no longer be looked up once the
1707 // method itself has been marked for unloading.
1708 _jmethod_id = method()->jmethod_id();
1709 }
1710 return _jmethod_id;
1711 }
1712
1713 void nmethod::post_compiled_method_unload() {
1714 if (unload_reported()) {
1715 // During unloading we transition to unloaded and then to zombie
1716 // and the unloading is reported during the first transition.
1717 return;
1718 }
1719
1720 assert(_method != NULL && !is_unloaded(), "just checking");
1721 DTRACE_METHOD_UNLOAD_PROBE(method());
1722
1723 // If a JVMTI agent has enabled the CompiledMethodUnload event then
1724 // post the event. Sometime later this nmethod will be made a zombie
1725 // by the sweeper but the Method* will not be valid at that point.
1726 // If the _jmethod_id is null then no load event was ever requested
1727 // so don't bother posting the unload. The main reason for this is
1728 // that the jmethodID is a weak reference to the Method* so if
1729 // it's being unloaded there's no way to look it up since the weak
1730 // ref will have been cleared.
1731 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) {
1732 assert(!unload_reported(), "already unloaded");
1733 JvmtiDeferredEvent event =
1734 JvmtiDeferredEvent::compiled_method_unload_event(this,
1735 _jmethod_id, insts_begin());
1736 if (SafepointSynchronize::is_at_safepoint()) {
1737 // Don't want to take the queueing lock. Add it as pending and
1738 // it will get enqueued later.
1739 JvmtiDeferredEventQueue::add_pending_event(event);
1740 } else {
1741 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1742 JvmtiDeferredEventQueue::enqueue(event);
1743 }
1744 }
1745
1746 // The JVMTI CompiledMethodUnload event can be enabled or disabled at
1747 // any time. As the nmethod is being unloaded now we mark it has
1748 // having the unload event reported - this will ensure that we don't
1749 // attempt to report the event in the unlikely scenario where the
1750 // event is enabled at the time the nmethod is made a zombie.
1751 set_unload_reported();
1752 }
1753
1754 void static clean_ic_if_metadata_is_dead(CompiledIC *ic, BoolObjectClosure *is_alive) {
1755 if (ic->is_icholder_call()) {
1756 // The only exception is compiledICHolder oops which may
1757 // yet be marked below. (We check this further below).
1758 CompiledICHolder* cichk_oop = ic->cached_icholder();
1759
1760 if (cichk_oop->holder_method()->method_holder()->is_loader_alive(is_alive) &&
1761 cichk_oop->holder_klass()->is_loader_alive(is_alive)) {
1762 return;
1763 }
1764 } else {
1765 Metadata* ic_oop = ic->cached_metadata();
1766 if (ic_oop != NULL) {
1767 if (ic_oop->is_klass()) {
1768 if (((Klass*)ic_oop)->is_loader_alive(is_alive)) {
1769 return;
1770 }
1771 } else if (ic_oop->is_method()) {
1772 if (((Method*)ic_oop)->method_holder()->is_loader_alive(is_alive)) {
1773 return;
1774 }
1775 } else {
1776 ShouldNotReachHere();
1777 }
1778 }
1779 }
1780
1781 ic->set_to_clean();
1782 }
1783
1784 // This is called at the end of the strong tracing/marking phase of a
1785 // GC to unload an nmethod if it contains otherwise unreachable
1786 // oops.
1787
1788 void nmethod::do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred) {
1789 // Make sure the oop's ready to receive visitors
1790 assert(!is_zombie() && !is_unloaded(),
1791 "should not call follow on zombie or unloaded nmethod");
1792
1793 // If the method is not entrant then a JMP is plastered over the
1794 // first few bytes. If an oop in the old code was there, that oop
1795 // should not get GC'd. Skip the first few bytes of oops on
1796 // not-entrant methods.
1797 address low_boundary = verified_entry_point();
1798 if (is_not_entrant()) {
1799 low_boundary += NativeJump::instruction_size;
1800 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1801 // (See comment above.)
1802 }
1803
1804 // The RedefineClasses() API can cause the class unloading invariant
1805 // to no longer be true. See jvmtiExport.hpp for details.
1806 // Also, leave a debugging breadcrumb in local flag.
1807 if (JvmtiExport::has_redefined_a_class()) {
1808 // This set of the unloading_occurred flag is done before the
1809 // call to post_compiled_method_unload() so that the unloading
1810 // of this nmethod is reported.
1811 unloading_occurred = true;
1812 }
1813
1814 // Exception cache
1815 clean_exception_cache(is_alive);
1816
1817 // If class unloading occurred we first iterate over all inline caches and
1818 // clear ICs where the cached oop is referring to an unloaded klass or method.
1819 // The remaining live cached oops will be traversed in the relocInfo::oop_type
1820 // iteration below.
1821 if (unloading_occurred) {
1822 RelocIterator iter(this, low_boundary);
1823 while(iter.next()) {
1824 if (iter.type() == relocInfo::virtual_call_type) {
1825 CompiledIC *ic = CompiledIC_at(&iter);
1826 clean_ic_if_metadata_is_dead(ic, is_alive);
1827 }
1828 }
1829 }
1830
1831 // Compiled code
1832 {
1833 RelocIterator iter(this, low_boundary);
1834 while (iter.next()) {
1835 if (iter.type() == relocInfo::oop_type) {
1836 oop_Relocation* r = iter.oop_reloc();
1837 // In this loop, we must only traverse those oops directly embedded in
1838 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1839 assert(1 == (r->oop_is_immediate()) +
1840 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1841 "oop must be found in exactly one place");
1842 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1843 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) {
1844 return;
1845 }
1846 }
1847 }
1848 }
1849 }
1850
1851
1852 // Scopes
1853 for (oop* p = oops_begin(); p < oops_end(); p++) {
1854 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1855 if (can_unload(is_alive, p, unloading_occurred)) {
1856 return;
1857 }
1858 }
1859
1860 #if INCLUDE_JVMCI
1861 // Follow JVMCI method
1862 BarrierSet* bs = Universe::heap()->barrier_set();
1863 if (_jvmci_installed_code != NULL) {
1864 if (_jvmci_installed_code->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(_jvmci_installed_code)) {
1865 if (!is_alive->do_object_b(_jvmci_installed_code)) {
1866 clear_jvmci_installed_code();
1867 }
1868 } else {
1869 if (can_unload(is_alive, (oop*)&_jvmci_installed_code, unloading_occurred)) {
1870 return;
1871 }
1872 }
1873 }
1874
1875 if (_speculation_log != NULL) {
1876 if (!is_alive->do_object_b(_speculation_log)) {
1877 bs->write_ref_nmethod_pre(&_speculation_log, this);
1878 _speculation_log = NULL;
1879 bs->write_ref_nmethod_post(&_speculation_log, this);
1880 }
1881 }
1882 #endif
1883
1884
1885 // Ensure that all metadata is still alive
1886 verify_metadata_loaders(low_boundary, is_alive);
1887 }
1888
1889 template <class CompiledICorStaticCall>
1890 static bool clean_if_nmethod_is_unloaded(CompiledICorStaticCall *ic, address addr, BoolObjectClosure *is_alive, nmethod* from) {
1891 // Ok, to lookup references to zombies here
1892 CodeBlob *cb = CodeCache::find_blob_unsafe(addr);
1893 if (cb != NULL && cb->is_nmethod()) {
1894 nmethod* nm = (nmethod*)cb;
1895
1896 if (nm->unloading_clock() != nmethod::global_unloading_clock()) {
1897 // The nmethod has not been processed yet.
1898 return true;
1899 }
1900
1901 // Clean inline caches pointing to both zombie and not_entrant methods
1902 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1903 ic->set_to_clean();
1904 assert(ic->is_clean(), "nmethod " PTR_FORMAT "not clean %s", p2i(from), from->method()->name_and_sig_as_C_string());
1905 }
1906 }
1907
1908 return false;
1909 }
1910
1911 static bool clean_if_nmethod_is_unloaded(CompiledIC *ic, BoolObjectClosure *is_alive, nmethod* from) {
1912 return clean_if_nmethod_is_unloaded(ic, ic->ic_destination(), is_alive, from);
1913 }
1914
1915 static bool clean_if_nmethod_is_unloaded(CompiledStaticCall *csc, BoolObjectClosure *is_alive, nmethod* from) {
1916 return clean_if_nmethod_is_unloaded(csc, csc->destination(), is_alive, from);
1917 }
1918
1919 bool nmethod::unload_if_dead_at(RelocIterator* iter_at_oop, BoolObjectClosure *is_alive, bool unloading_occurred) {
1920 assert(iter_at_oop->type() == relocInfo::oop_type, "Wrong relocation type");
1921
1922 oop_Relocation* r = iter_at_oop->oop_reloc();
1923 // Traverse those oops directly embedded in the code.
1924 // Other oops (oop_index>0) are seen as part of scopes_oops.
1925 assert(1 == (r->oop_is_immediate()) +
1926 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1927 "oop must be found in exactly one place");
1928 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1929 // Unload this nmethod if the oop is dead.
1930 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) {
1931 return true;;
1932 }
1933 }
1934
1935 return false;
1936 }
1937
1938
1939 bool nmethod::do_unloading_parallel(BoolObjectClosure* is_alive, bool unloading_occurred) {
1940 ResourceMark rm;
1941
1942 // Make sure the oop's ready to receive visitors
1943 assert(!is_zombie() && !is_unloaded(),
1944 "should not call follow on zombie or unloaded nmethod");
1945
1946 // If the method is not entrant then a JMP is plastered over the
1947 // first few bytes. If an oop in the old code was there, that oop
1948 // should not get GC'd. Skip the first few bytes of oops on
1949 // not-entrant methods.
1950 address low_boundary = verified_entry_point();
1951 if (is_not_entrant()) {
1952 low_boundary += NativeJump::instruction_size;
1953 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1954 // (See comment above.)
1955 }
1956
1957 // The RedefineClasses() API can cause the class unloading invariant
1958 // to no longer be true. See jvmtiExport.hpp for details.
1959 // Also, leave a debugging breadcrumb in local flag.
1960 if (JvmtiExport::has_redefined_a_class()) {
1961 // This set of the unloading_occurred flag is done before the
1962 // call to post_compiled_method_unload() so that the unloading
1963 // of this nmethod is reported.
1964 unloading_occurred = true;
1965 }
1966
1967 // Exception cache
1968 clean_exception_cache(is_alive);
1969
1970 bool is_unloaded = false;
1971 bool postponed = false;
1972
1973 RelocIterator iter(this, low_boundary);
1974 while(iter.next()) {
1975
1976 switch (iter.type()) {
1977
1978 case relocInfo::virtual_call_type:
1979 if (unloading_occurred) {
1980 // If class unloading occurred we first iterate over all inline caches and
1981 // clear ICs where the cached oop is referring to an unloaded klass or method.
1982 clean_ic_if_metadata_is_dead(CompiledIC_at(&iter), is_alive);
1983 }
1984
1985 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
1986 break;
1987
1988 case relocInfo::opt_virtual_call_type:
1989 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
1990 break;
1991
1992 case relocInfo::static_call_type:
1993 postponed |= clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this);
1994 break;
1995
1996 case relocInfo::oop_type:
1997 if (!is_unloaded) {
1998 is_unloaded = unload_if_dead_at(&iter, is_alive, unloading_occurred);
1999 }
2000 break;
2001
2002 case relocInfo::metadata_type:
2003 break; // nothing to do.
2004 }
2005 }
2006
2007 if (is_unloaded) {
2008 return postponed;
2009 }
2010
2011 // Scopes
2012 for (oop* p = oops_begin(); p < oops_end(); p++) {
2013 if (*p == Universe::non_oop_word()) continue; // skip non-oops
2014 if (can_unload(is_alive, p, unloading_occurred)) {
2015 is_unloaded = true;
2016 break;
2017 }
2018 }
2019
2020 if (is_unloaded) {
2021 return postponed;
2022 }
2023
2024 #if INCLUDE_JVMCI
2025 // Follow JVMCI method
2026 BarrierSet* bs = Universe::heap()->barrier_set();
2027 if (_jvmci_installed_code != NULL) {
2028 if (_jvmci_installed_code->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(_jvmci_installed_code)) {
2029 if (!is_alive->do_object_b(_jvmci_installed_code)) {
2030 clear_jvmci_installed_code();
2031 }
2032 } else {
2033 if (can_unload(is_alive, (oop*)&_jvmci_installed_code, unloading_occurred)) {
2034 is_unloaded = true;
2035 }
2036 }
2037 }
2038
2039 if (_speculation_log != NULL) {
2040 if (!is_alive->do_object_b(_speculation_log)) {
2041 bs->write_ref_nmethod_pre(&_speculation_log, this);
2042 _speculation_log = NULL;
2043 bs->write_ref_nmethod_post(&_speculation_log, this);
2044 }
2045 }
2046 #endif
2047
2048 // Ensure that all metadata is still alive
2049 verify_metadata_loaders(low_boundary, is_alive);
2050
2051 return postponed;
2052 }
2053
2054 void nmethod::do_unloading_parallel_postponed(BoolObjectClosure* is_alive, bool unloading_occurred) {
2055 ResourceMark rm;
2056
2057 // Make sure the oop's ready to receive visitors
2058 assert(!is_zombie(),
2059 "should not call follow on zombie nmethod");
2060
2061 // If the method is not entrant then a JMP is plastered over the
2062 // first few bytes. If an oop in the old code was there, that oop
2063 // should not get GC'd. Skip the first few bytes of oops on
2064 // not-entrant methods.
2065 address low_boundary = verified_entry_point();
2066 if (is_not_entrant()) {
2067 low_boundary += NativeJump::instruction_size;
2068 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
2069 // (See comment above.)
2070 }
2071
2072 RelocIterator iter(this, low_boundary);
2073 while(iter.next()) {
2074
2075 switch (iter.type()) {
2076
2077 case relocInfo::virtual_call_type:
2078 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
2079 break;
2080
2081 case relocInfo::opt_virtual_call_type:
2082 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
2083 break;
2084
2085 case relocInfo::static_call_type:
2086 clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this);
2087 break;
2088 }
2089 }
2090 }
2091
2092 #ifdef ASSERT
2093
2094 class CheckClass : AllStatic {
2095 static BoolObjectClosure* _is_alive;
2096
2097 // Check class_loader is alive for this bit of metadata.
2098 static void check_class(Metadata* md) {
2099 Klass* klass = NULL;
2100 if (md->is_klass()) {
2101 klass = ((Klass*)md);
2102 } else if (md->is_method()) {
2103 klass = ((Method*)md)->method_holder();
2104 } else if (md->is_methodData()) {
2105 klass = ((MethodData*)md)->method()->method_holder();
2106 } else {
2107 md->print();
2108 ShouldNotReachHere();
2109 }
2110 assert(klass->is_loader_alive(_is_alive), "must be alive");
2111 }
2112 public:
2113 static void do_check_class(BoolObjectClosure* is_alive, nmethod* nm) {
2114 assert(SafepointSynchronize::is_at_safepoint(), "this is only ok at safepoint");
2115 _is_alive = is_alive;
2116 nm->metadata_do(check_class);
2117 }
2118 };
2119
2120 // This is called during a safepoint so can use static data
2121 BoolObjectClosure* CheckClass::_is_alive = NULL;
2122 #endif // ASSERT
2123
2124
2125 // Processing of oop references should have been sufficient to keep
2126 // all strong references alive. Any weak references should have been
2127 // cleared as well. Visit all the metadata and ensure that it's
2128 // really alive.
2129 void nmethod::verify_metadata_loaders(address low_boundary, BoolObjectClosure* is_alive) {
2130 #ifdef ASSERT
2131 RelocIterator iter(this, low_boundary);
2132 while (iter.next()) {
2133 // static_stub_Relocations may have dangling references to
2134 // Method*s so trim them out here. Otherwise it looks like
2135 // compiled code is maintaining a link to dead metadata.
2136 address static_call_addr = NULL;
2137 if (iter.type() == relocInfo::opt_virtual_call_type) {
2138 CompiledIC* cic = CompiledIC_at(&iter);
2139 if (!cic->is_call_to_interpreted()) {
2140 static_call_addr = iter.addr();
2141 }
2142 } else if (iter.type() == relocInfo::static_call_type) {
2143 CompiledStaticCall* csc = compiledStaticCall_at(iter.reloc());
2144 if (!csc->is_call_to_interpreted()) {
2145 static_call_addr = iter.addr();
2146 }
2147 }
2148 if (static_call_addr != NULL) {
2149 RelocIterator sciter(this, low_boundary);
2150 while (sciter.next()) {
2151 if (sciter.type() == relocInfo::static_stub_type &&
2152 sciter.static_stub_reloc()->static_call() == static_call_addr) {
2153 sciter.static_stub_reloc()->clear_inline_cache();
2154 }
2155 }
2156 }
2157 }
2158 // Check that the metadata embedded in the nmethod is alive
2159 CheckClass::do_check_class(is_alive, this);
2160 #endif
2161 }
2162
2163
2164 // Iterate over metadata calling this function. Used by RedefineClasses
2165 void nmethod::metadata_do(void f(Metadata*)) {
2166 address low_boundary = verified_entry_point();
2167 if (is_not_entrant()) {
2168 low_boundary += NativeJump::instruction_size;
2169 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
2170 // (See comment above.)
2171 }
2172 {
2173 // Visit all immediate references that are embedded in the instruction stream.
2174 RelocIterator iter(this, low_boundary);
2175 while (iter.next()) {
2176 if (iter.type() == relocInfo::metadata_type ) {
2177 metadata_Relocation* r = iter.metadata_reloc();
2178 // In this metadata, we must only follow those metadatas directly embedded in
2179 // the code. Other metadatas (oop_index>0) are seen as part of
2180 // the metadata section below.
2181 assert(1 == (r->metadata_is_immediate()) +
2182 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
2183 "metadata must be found in exactly one place");
2184 if (r->metadata_is_immediate() && r->metadata_value() != NULL) {
2185 Metadata* md = r->metadata_value();
2186 if (md != _method) f(md);
2187 }
2188 } else if (iter.type() == relocInfo::virtual_call_type) {
2189 // Check compiledIC holders associated with this nmethod
2190 CompiledIC *ic = CompiledIC_at(&iter);
2191 if (ic->is_icholder_call()) {
2192 CompiledICHolder* cichk = ic->cached_icholder();
2193 f(cichk->holder_method());
2194 f(cichk->holder_klass());
2195 } else {
2196 Metadata* ic_oop = ic->cached_metadata();
2197 if (ic_oop != NULL) {
2198 f(ic_oop);
2199 }
2200 }
2201 }
2202 }
2203 }
2204
2205 // Visit the metadata section
2206 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
2207 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops
2208 Metadata* md = *p;
2209 f(md);
2210 }
2211
2212 // Visit metadata not embedded in the other places.
2213 if (_method != NULL) f(_method);
2214 }
2215
2216 void nmethod::oops_do(OopClosure* f, bool allow_zombie) {
2217 // make sure the oops ready to receive visitors
2218 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod");
2219 assert(!is_unloaded(), "should not call follow on unloaded nmethod");
2220
2221 // If the method is not entrant or zombie then a JMP is plastered over the
2222 // first few bytes. If an oop in the old code was there, that oop
2223 // should not get GC'd. Skip the first few bytes of oops on
2224 // not-entrant methods.
2225 address low_boundary = verified_entry_point();
2226 if (is_not_entrant()) {
2227 low_boundary += NativeJump::instruction_size;
2228 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
2229 // (See comment above.)
2230 }
2231
2232 #if INCLUDE_JVMCI
2233 if (_jvmci_installed_code != NULL) {
2234 f->do_oop((oop*) &_jvmci_installed_code);
2235 }
2236 if (_speculation_log != NULL) {
2237 f->do_oop((oop*) &_speculation_log);
2238 }
2239 #endif
2240
2241 RelocIterator iter(this, low_boundary);
2242
2243 while (iter.next()) {
2244 if (iter.type() == relocInfo::oop_type ) {
2245 oop_Relocation* r = iter.oop_reloc();
2246 // In this loop, we must only follow those oops directly embedded in
2247 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
2248 assert(1 == (r->oop_is_immediate()) +
2249 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
2250 "oop must be found in exactly one place");
2251 if (r->oop_is_immediate() && r->oop_value() != NULL) {
2252 f->do_oop(r->oop_addr());
2253 }
2254 }
2255 }
2256
2257 // Scopes
2258 // This includes oop constants not inlined in the code stream.
2259 for (oop* p = oops_begin(); p < oops_end(); p++) {
2260 if (*p == Universe::non_oop_word()) continue; // skip non-oops
2261 f->do_oop(p);
2262 }
2263 }
2264
2265 #define NMETHOD_SENTINEL ((nmethod*)badAddress)
2266
2267 nmethod* volatile nmethod::_oops_do_mark_nmethods;
2268
2269 // An nmethod is "marked" if its _mark_link is set non-null.
2270 // Even if it is the end of the linked list, it will have a non-null link value,
2271 // as long as it is on the list.
2272 // This code must be MP safe, because it is used from parallel GC passes.
2273 bool nmethod::test_set_oops_do_mark() {
2274 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");
2275 nmethod* observed_mark_link = _oops_do_mark_link;
2276 if (observed_mark_link == NULL) {
2277 // Claim this nmethod for this thread to mark.
2278 observed_mark_link = (nmethod*)
2279 Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_link, NULL);
2280 if (observed_mark_link == NULL) {
2281
2282 // Atomically append this nmethod (now claimed) to the head of the list:
2283 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods;
2284 for (;;) {
2285 nmethod* required_mark_nmethods = observed_mark_nmethods;
2286 _oops_do_mark_link = required_mark_nmethods;
2287 observed_mark_nmethods = (nmethod*)
2288 Atomic::cmpxchg_ptr(this, &_oops_do_mark_nmethods, required_mark_nmethods);
2289 if (observed_mark_nmethods == required_mark_nmethods)
2290 break;
2291 }
2292 // Mark was clear when we first saw this guy.
2293 if (TraceScavenge) { print_on(tty, "oops_do, mark"); }
2294 return false;
2295 }
2296 }
2297 // On fall through, another racing thread marked this nmethod before we did.
2298 return true;
2299 }
2300
2301 void nmethod::oops_do_marking_prologue() {
2302 if (TraceScavenge) { tty->print_cr("[oops_do_marking_prologue"); }
2303 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row");
2304 // We use cmpxchg_ptr instead of regular assignment here because the user
2305 // may fork a bunch of threads, and we need them all to see the same state.
2306 void* observed = Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, NULL);
2307 guarantee(observed == NULL, "no races in this sequential code");
2308 }
2309
2310 void nmethod::oops_do_marking_epilogue() {
2311 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row");
2312 nmethod* cur = _oops_do_mark_nmethods;
2313 while (cur != NMETHOD_SENTINEL) {
2314 assert(cur != NULL, "not NULL-terminated");
2315 nmethod* next = cur->_oops_do_mark_link;
2316 cur->_oops_do_mark_link = NULL;
2317 DEBUG_ONLY(cur->verify_oop_relocations());
2318 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark"));
2319 cur = next;
2320 }
2321 void* required = _oops_do_mark_nmethods;
2322 void* observed = Atomic::cmpxchg_ptr(NULL, &_oops_do_mark_nmethods, required);
2323 guarantee(observed == required, "no races in this sequential code");
2324 if (TraceScavenge) { tty->print_cr("oops_do_marking_epilogue]"); }
2325 }
2326
2327 class DetectScavengeRoot: public OopClosure {
2328 bool _detected_scavenge_root;
2329 public:
2330 DetectScavengeRoot() : _detected_scavenge_root(false)
2331 { NOT_PRODUCT(_print_nm = NULL); }
2332 bool detected_scavenge_root() { return _detected_scavenge_root; }
2333 virtual void do_oop(oop* p) {
2334 if ((*p) != NULL && (*p)->is_scavengable()) {
2335 NOT_PRODUCT(maybe_print(p));
2336 _detected_scavenge_root = true;
2337 }
2338 }
2339 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2340
2341 #ifndef PRODUCT
2342 nmethod* _print_nm;
2343 void maybe_print(oop* p) {
2344 if (_print_nm == NULL) return;
2345 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root");
2346 tty->print_cr("" PTR_FORMAT "[offset=%d] detected scavengable oop " PTR_FORMAT " (found at " PTR_FORMAT ")",
2347 p2i(_print_nm), (int)((intptr_t)p - (intptr_t)_print_nm),
2348 p2i(*p), p2i(p));
2349 (*p)->print();
2350 }
2351 #endif //PRODUCT
2352 };
2353
2354 bool nmethod::detect_scavenge_root_oops() {
2355 DetectScavengeRoot detect_scavenge_root;
2356 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this);
2357 oops_do(&detect_scavenge_root);
2358 return detect_scavenge_root.detected_scavenge_root();
2359 }
2360
2361 // Method that knows how to preserve outgoing arguments at call. This method must be
2362 // called with a frame corresponding to a Java invoke
2363 void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) {
2364 #ifndef SHARK
2365 if (method() != NULL && !method()->is_native()) {
2366 address pc = fr.pc();
2367 SimpleScopeDesc ssd(this, pc);
2368 Bytecode_invoke call(ssd.method(), ssd.bci());
2369 bool has_receiver = call.has_receiver();
2370 bool has_appendix = call.has_appendix();
2371 Symbol* signature = call.signature();
2372
2373 // The method attached by JIT-compilers should be used, if present.
2374 // Bytecode can be inaccurate in such case.
2375 Method* callee = attached_method_before_pc(pc);
2376 if (callee != NULL) {
2377 has_receiver = !(callee->access_flags().is_static());
2378 has_appendix = false;
2379 signature = callee->signature();
2380 }
2381
2382 fr.oops_compiled_arguments_do(signature, has_receiver, has_appendix, reg_map, f);
2383 }
2384 #endif // !SHARK
2385 }
2386
2387 inline bool includes(void* p, void* from, void* to) {
2388 return from <= p && p < to;
2389 }
2390
2391
2392 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
2393 assert(count >= 2, "must be sentinel values, at least");
2394
2395 #ifdef ASSERT
2396 // must be sorted and unique; we do a binary search in find_pc_desc()
2397 int prev_offset = pcs[0].pc_offset();
2398 assert(prev_offset == PcDesc::lower_offset_limit,
2399 "must start with a sentinel");
2400 for (int i = 1; i < count; i++) {
2401 int this_offset = pcs[i].pc_offset();
2402 assert(this_offset > prev_offset, "offsets must be sorted");
2403 prev_offset = this_offset;
2404 }
2405 assert(prev_offset == PcDesc::upper_offset_limit,
2406 "must end with a sentinel");
2407 #endif //ASSERT
2408
2409 // Search for MethodHandle invokes and tag the nmethod.
2410 for (int i = 0; i < count; i++) {
2411 if (pcs[i].is_method_handle_invoke()) {
2412 set_has_method_handle_invokes(true);
2413 break;
2414 }
2415 }
2416 assert(has_method_handle_invokes() == (_deoptimize_mh_offset != -1), "must have deopt mh handler");
2417
2418 int size = count * sizeof(PcDesc);
2419 assert(scopes_pcs_size() >= size, "oob");
2420 memcpy(scopes_pcs_begin(), pcs, size);
2421
2422 // Adjust the final sentinel downward.
2423 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
2424 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
2425 last_pc->set_pc_offset(content_size() + 1);
2426 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
2427 // Fill any rounding gaps with copies of the last record.
2428 last_pc[1] = last_pc[0];
2429 }
2430 // The following assert could fail if sizeof(PcDesc) is not
2431 // an integral multiple of oopSize (the rounding term).
2432 // If it fails, change the logic to always allocate a multiple
2433 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
2434 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
2435 }
2436
2437 void nmethod::copy_scopes_data(u_char* buffer, int size) {
2438 assert(scopes_data_size() >= size, "oob");
2439 memcpy(scopes_data_begin(), buffer, size);
2440 }
2441
2442 // When using JVMCI the address might be off by the size of a call instruction.
2443 bool nmethod::is_deopt_entry(address pc) {
2444 return pc == deopt_handler_begin()
2445 #if INCLUDE_JVMCI
2446 || pc == (deopt_handler_begin() + NativeCall::instruction_size)
2447 #endif
2448 ;
2449 }
2450
2451 #ifdef ASSERT
2452 static PcDesc* linear_search(nmethod* nm, int pc_offset, bool approximate) {
2453 PcDesc* lower = nm->scopes_pcs_begin();
2454 PcDesc* upper = nm->scopes_pcs_end();
2455 lower += 1; // exclude initial sentinel
2456 PcDesc* res = NULL;
2457 for (PcDesc* p = lower; p < upper; p++) {
2458 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc
2459 if (match_desc(p, pc_offset, approximate)) {
2460 if (res == NULL)
2461 res = p;
2462 else
2463 res = (PcDesc*) badAddress;
2464 }
2465 }
2466 return res;
2467 }
2468 #endif
2469
2470
2471 // Finds a PcDesc with real-pc equal to "pc"
2472 PcDesc* nmethod::find_pc_desc_internal(address pc, bool approximate) {
2473 address base_address = code_begin();
2474 if ((pc < base_address) ||
2475 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
2476 return NULL; // PC is wildly out of range
2477 }
2478 int pc_offset = (int) (pc - base_address);
2479
2480 // Check the PcDesc cache if it contains the desired PcDesc
2481 // (This as an almost 100% hit rate.)
2482 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
2483 if (res != NULL) {
2484 assert(res == linear_search(this, pc_offset, approximate), "cache ok");
2485 return res;
2486 }
2487
2488 // Fallback algorithm: quasi-linear search for the PcDesc
2489 // Find the last pc_offset less than the given offset.
2490 // The successor must be the required match, if there is a match at all.
2491 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
2492 PcDesc* lower = scopes_pcs_begin();
2493 PcDesc* upper = scopes_pcs_end();
2494 upper -= 1; // exclude final sentinel
2495 if (lower >= upper) return NULL; // native method; no PcDescs at all
2496
2497 #define assert_LU_OK \
2498 /* invariant on lower..upper during the following search: */ \
2499 assert(lower->pc_offset() < pc_offset, "sanity"); \
2500 assert(upper->pc_offset() >= pc_offset, "sanity")
2501 assert_LU_OK;
2502
2503 // Use the last successful return as a split point.
2504 PcDesc* mid = _pc_desc_cache.last_pc_desc();
2505 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
2506 if (mid->pc_offset() < pc_offset) {
2507 lower = mid;
2508 } else {
2509 upper = mid;
2510 }
2511
2512 // Take giant steps at first (4096, then 256, then 16, then 1)
2513 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
2514 const int RADIX = (1 << LOG2_RADIX);
2515 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
2516 while ((mid = lower + step) < upper) {
2517 assert_LU_OK;
2518 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
2519 if (mid->pc_offset() < pc_offset) {
2520 lower = mid;
2521 } else {
2522 upper = mid;
2523 break;
2524 }
2525 }
2526 assert_LU_OK;
2527 }
2528
2529 // Sneak up on the value with a linear search of length ~16.
2530 while (true) {
2531 assert_LU_OK;
2532 mid = lower + 1;
2533 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
2534 if (mid->pc_offset() < pc_offset) {
2535 lower = mid;
2536 } else {
2537 upper = mid;
2538 break;
2539 }
2540 }
2541 #undef assert_LU_OK
2542
2543 if (match_desc(upper, pc_offset, approximate)) {
2544 assert(upper == linear_search(this, pc_offset, approximate), "search ok");
2545 _pc_desc_cache.add_pc_desc(upper);
2546 return upper;
2547 } else {
2548 assert(NULL == linear_search(this, pc_offset, approximate), "search ok");
2549 return NULL;
2550 }
2551 }
2552
2553
2554 void nmethod::check_all_dependencies(DepChange& changes) {
2555 // Checked dependencies are allocated into this ResourceMark
2556 ResourceMark rm;
2557
2558 // Turn off dependency tracing while actually testing dependencies.
2559 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) );
2560
2561 typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash,
2562 &DependencySignature::equals, 11027> DepTable;
2563
2564 DepTable* table = new DepTable();
2565
2566 // Iterate over live nmethods and check dependencies of all nmethods that are not
2567 // marked for deoptimization. A particular dependency is only checked once.
2568 NMethodIterator iter;
2569 while(iter.next()) {
2570 nmethod* nm = iter.method();
2571 // Only notify for live nmethods
2572 if (nm->is_alive() && !nm->is_marked_for_deoptimization()) {
2573 for (Dependencies::DepStream deps(nm); deps.next(); ) {
2574 // Construct abstraction of a dependency.
2575 DependencySignature* current_sig = new DependencySignature(deps);
2576
2577 // Determine if dependency is already checked. table->put(...) returns
2578 // 'true' if the dependency is added (i.e., was not in the hashtable).
2579 if (table->put(*current_sig, 1)) {
2580 if (deps.check_dependency() != NULL) {
2581 // Dependency checking failed. Print out information about the failed
2582 // dependency and finally fail with an assert. We can fail here, since
2583 // dependency checking is never done in a product build.
2584 tty->print_cr("Failed dependency:");
2585 changes.print();
2586 nm->print();
2587 nm->print_dependencies();
2588 assert(false, "Should have been marked for deoptimization");
2589 }
2590 }
2591 }
2592 }
2593 }
2594 }
2595
2596 bool nmethod::check_dependency_on(DepChange& changes) {
2597 // What has happened:
2598 // 1) a new class dependee has been added
2599 // 2) dependee and all its super classes have been marked
2600 bool found_check = false; // set true if we are upset
2601 for (Dependencies::DepStream deps(this); deps.next(); ) {
2602 // Evaluate only relevant dependencies.
2603 if (deps.spot_check_dependency_at(changes) != NULL) {
2604 found_check = true;
2605 NOT_DEBUG(break);
2606 }
2607 }
2608 return found_check;
2609 }
2610
2611 bool nmethod::is_evol_dependent_on(Klass* dependee) {
2612 InstanceKlass *dependee_ik = InstanceKlass::cast(dependee);
2613 Array<Method*>* dependee_methods = dependee_ik->methods();
2614 for (Dependencies::DepStream deps(this); deps.next(); ) {
2615 if (deps.type() == Dependencies::evol_method) {
2616 Method* method = deps.method_argument(0);
2617 for (int j = 0; j < dependee_methods->length(); j++) {
2618 if (dependee_methods->at(j) == method) {
2619 // RC_TRACE macro has an embedded ResourceMark
2620 RC_TRACE(0x01000000,
2621 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)",
2622 _method->method_holder()->external_name(),
2623 _method->name()->as_C_string(),
2624 _method->signature()->as_C_string(), compile_id(),
2625 method->method_holder()->external_name(),
2626 method->name()->as_C_string(),
2627 method->signature()->as_C_string()));
2628 if (TraceDependencies || LogCompilation)
2629 deps.log_dependency(dependee);
2630 return true;
2631 }
2632 }
2633 }
2634 }
2635 return false;
2636 }
2637
2638 // Called from mark_for_deoptimization, when dependee is invalidated.
2639 bool nmethod::is_dependent_on_method(Method* dependee) {
2640 for (Dependencies::DepStream deps(this); deps.next(); ) {
2641 if (deps.type() != Dependencies::evol_method)
2642 continue;
2643 Method* method = deps.method_argument(0);
2644 if (method == dependee) return true;
2645 }
2646 return false;
2647 }
2648
2649
2650 bool nmethod::is_patchable_at(address instr_addr) {
2651 assert(insts_contains(instr_addr), "wrong nmethod used");
2652 if (is_zombie()) {
2653 // a zombie may never be patched
2654 return false;
2655 }
2656 return true;
2657 }
2658
2659
2660 address nmethod::continuation_for_implicit_exception(address pc) {
2661 // Exception happened outside inline-cache check code => we are inside
2662 // an active nmethod => use cpc to determine a return address
2663 int exception_offset = pc - code_begin();
2664 int cont_offset = ImplicitExceptionTable(this).at( exception_offset );
2665 #ifdef ASSERT
2666 if (cont_offset == 0) {
2667 Thread* thread = Thread::current();
2668 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
2669 HandleMark hm(thread);
2670 ResourceMark rm(thread);
2671 CodeBlob* cb = CodeCache::find_blob(pc);
2672 assert(cb != NULL && cb == this, "");
2673 ttyLocker ttyl;
2674 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, p2i(pc));
2675 print();
2676 method()->print_codes();
2677 print_code();
2678 print_pcs();
2679 }
2680 #endif
2681 if (cont_offset == 0) {
2682 // Let the normal error handling report the exception
2683 return NULL;
2684 }
2685 return code_begin() + cont_offset;
2686 }
2687
2688
2689
2690 void nmethod_init() {
2691 // make sure you didn't forget to adjust the filler fields
2692 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
2693 }
2694
2695
2696 //-------------------------------------------------------------------------------------------
2697
2698
2699 // QQQ might we make this work from a frame??
2700 nmethodLocker::nmethodLocker(address pc) {
2701 CodeBlob* cb = CodeCache::find_blob(pc);
2702 guarantee(cb != NULL && cb->is_nmethod(), "bad pc for a nmethod found");
2703 _nm = (nmethod*)cb;
2704 lock_nmethod(_nm);
2705 }
2706
2707 // Only JvmtiDeferredEvent::compiled_method_unload_event()
2708 // should pass zombie_ok == true.
2709 void nmethodLocker::lock_nmethod(nmethod* nm, bool zombie_ok) {
2710 if (nm == NULL) return;
2711 Atomic::inc(&nm->_lock_count);
2712 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method");
2713 }
2714
2715 void nmethodLocker::unlock_nmethod(nmethod* nm) {
2716 if (nm == NULL) return;
2717 Atomic::dec(&nm->_lock_count);
2718 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock");
2719 }
2720
2721 // -----------------------------------------------------------------------------
2722 // nmethod::get_deopt_original_pc
2723 //
2724 // Return the original PC for the given PC if:
2725 // (a) the given PC belongs to a nmethod and
2726 // (b) it is a deopt PC
2727 address nmethod::get_deopt_original_pc(const frame* fr) {
2728 if (fr->cb() == NULL) return NULL;
2729
2730 nmethod* nm = fr->cb()->as_nmethod_or_null();
2731 if (nm != NULL && nm->is_deopt_pc(fr->pc()))
2732 return nm->get_original_pc(fr);
2733
2734 return NULL;
2735 }
2736
2737
2738 // -----------------------------------------------------------------------------
2739 // MethodHandle
2740
2741 bool nmethod::is_method_handle_return(address return_pc) {
2742 if (!has_method_handle_invokes()) return false;
2743 PcDesc* pd = pc_desc_at(return_pc);
2744 if (pd == NULL)
2745 return false;
2746 return pd->is_method_handle_invoke();
2747 }
2748
2749
2750 // -----------------------------------------------------------------------------
2751 // Verification
2752
2753 class VerifyOopsClosure: public OopClosure {
2754 nmethod* _nm;
2755 bool _ok;
2756 public:
2757 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
2758 bool ok() { return _ok; }
2759 virtual void do_oop(oop* p) {
2760 if ((*p) == NULL || (*p)->is_oop()) return;
2761 if (_ok) {
2762 _nm->print_nmethod(true);
2763 _ok = false;
2764 }
2765 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2766 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2767 }
2768 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2769 };
2770
2771 void nmethod::verify() {
2772
2773 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant
2774 // seems odd.
2775
2776 if (is_zombie() || is_not_entrant() || is_unloaded())
2777 return;
2778
2779 // Make sure all the entry points are correctly aligned for patching.
2780 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
2781
2782 // assert(method()->is_oop(), "must be valid");
2783
2784 ResourceMark rm;
2785
2786 if (!CodeCache::contains(this)) {
2787 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this));
2788 }
2789
2790 if(is_native_method() )
2791 return;
2792
2793 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
2794 if (nm != this) {
2795 fatal("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this));
2796 }
2797
2798 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2799 if (! p->verify(this)) {
2800 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this));
2801 }
2802 }
2803
2804 VerifyOopsClosure voc(this);
2805 oops_do(&voc);
2806 assert(voc.ok(), "embedded oops must be OK");
2807 verify_scavenge_root_oops();
2808
2809 verify_scopes();
2810 }
2811
2812
2813 void nmethod::verify_interrupt_point(address call_site) {
2814 // Verify IC only when nmethod installation is finished.
2815 bool is_installed = (method()->code() == this) // nmethod is in state 'in_use' and installed
2816 || !this->is_in_use(); // nmethod is installed, but not in 'in_use' state
2817 if (is_installed) {
2818 Thread *cur = Thread::current();
2819 if (CompiledIC_lock->owner() == cur ||
2820 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) &&
2821 SafepointSynchronize::is_at_safepoint())) {
2822 CompiledIC_at(this, call_site);
2823 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
2824 } else {
2825 MutexLocker ml_verify (CompiledIC_lock);
2826 CompiledIC_at(this, call_site);
2827 }
2828 }
2829
2830 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address());
2831 assert(pd != NULL, "PcDesc must exist");
2832 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(),
2833 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(),
2834 pd->return_oop());
2835 !sd->is_top(); sd = sd->sender()) {
2836 sd->verify();
2837 }
2838 }
2839
2840 void nmethod::verify_scopes() {
2841 if( !method() ) return; // Runtime stubs have no scope
2842 if (method()->is_native()) return; // Ignore stub methods.
2843 // iterate through all interrupt point
2844 // and verify the debug information is valid.
2845 RelocIterator iter((nmethod*)this);
2846 while (iter.next()) {
2847 address stub = NULL;
2848 switch (iter.type()) {
2849 case relocInfo::virtual_call_type:
2850 verify_interrupt_point(iter.addr());
2851 break;
2852 case relocInfo::opt_virtual_call_type:
2853 stub = iter.opt_virtual_call_reloc()->static_stub();
2854 verify_interrupt_point(iter.addr());
2855 break;
2856 case relocInfo::static_call_type:
2857 stub = iter.static_call_reloc()->static_stub();
2858 //verify_interrupt_point(iter.addr());
2859 break;
2860 case relocInfo::runtime_call_type:
2861 address destination = iter.reloc()->value();
2862 // Right now there is no way to find out which entries support
2863 // an interrupt point. It would be nice if we had this
2864 // information in a table.
2865 break;
2866 }
2867 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section");
2868 }
2869 }
2870
2871
2872 // -----------------------------------------------------------------------------
2873 // Non-product code
2874 #ifndef PRODUCT
2875
2876 class DebugScavengeRoot: public OopClosure {
2877 nmethod* _nm;
2878 bool _ok;
2879 public:
2880 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { }
2881 bool ok() { return _ok; }
2882 virtual void do_oop(oop* p) {
2883 if ((*p) == NULL || !(*p)->is_scavengable()) return;
2884 if (_ok) {
2885 _nm->print_nmethod(true);
2886 _ok = false;
2887 }
2888 tty->print_cr("*** scavengable oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2889 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2890 (*p)->print();
2891 }
2892 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2893 };
2894
2895 void nmethod::verify_scavenge_root_oops() {
2896 if (UseG1GC) {
2897 return;
2898 }
2899
2900 if (!on_scavenge_root_list()) {
2901 // Actually look inside, to verify the claim that it's clean.
2902 DebugScavengeRoot debug_scavenge_root(this);
2903 oops_do(&debug_scavenge_root);
2904 if (!debug_scavenge_root.ok())
2905 fatal("found an unadvertised bad scavengable oop in the code cache");
2906 }
2907 assert(scavenge_root_not_marked(), "");
2908 }
2909
2910 #endif // PRODUCT
2911
2912 // Printing operations
2913
2914 void nmethod::print() const {
2915 ResourceMark rm;
2916 ttyLocker ttyl; // keep the following output all in one block
2917
2918 tty->print("Compiled method ");
2919
2920 if (is_compiled_by_c1()) {
2921 tty->print("(c1) ");
2922 } else if (is_compiled_by_c2()) {
2923 tty->print("(c2) ");
2924 } else if (is_compiled_by_shark()) {
2925 tty->print("(shark) ");
2926 } else if (is_compiled_by_jvmci()) {
2927 tty->print("(JVMCI) ");
2928 } else {
2929 tty->print("(nm) ");
2930 }
2931
2932 print_on(tty, NULL);
2933
2934 if (WizardMode) {
2935 tty->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this));
2936 tty->print(" for method " INTPTR_FORMAT , p2i(method()));
2937 tty->print(" { ");
2938 tty->print_cr("%s ", state());
2939 if (on_scavenge_root_list()) tty->print("scavenge_root ");
2940 tty->print_cr("}:");
2941 }
2942 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2943 p2i(this),
2944 p2i(this) + size(),
2945 size());
2946 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2947 p2i(relocation_begin()),
2948 p2i(relocation_end()),
2949 relocation_size());
2950 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2951 p2i(consts_begin()),
2952 p2i(consts_end()),
2953 consts_size());
2954 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2955 p2i(insts_begin()),
2956 p2i(insts_end()),
2957 insts_size());
2958 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2959 p2i(stub_begin()),
2960 p2i(stub_end()),
2961 stub_size());
2962 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2963 p2i(oops_begin()),
2964 p2i(oops_end()),
2965 oops_size());
2966 if (metadata_size () > 0) tty->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2967 p2i(metadata_begin()),
2968 p2i(metadata_end()),
2969 metadata_size());
2970 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2971 p2i(scopes_data_begin()),
2972 p2i(scopes_data_end()),
2973 scopes_data_size());
2974 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2975 p2i(scopes_pcs_begin()),
2976 p2i(scopes_pcs_end()),
2977 scopes_pcs_size());
2978 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2979 p2i(dependencies_begin()),
2980 p2i(dependencies_end()),
2981 dependencies_size());
2982 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2983 p2i(handler_table_begin()),
2984 p2i(handler_table_end()),
2985 handler_table_size());
2986 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2987 p2i(nul_chk_table_begin()),
2988 p2i(nul_chk_table_end()),
2989 nul_chk_table_size());
2990 }
2991
2992 #ifndef PRODUCT
2993
2994 void nmethod::print_scopes() {
2995 // Find the first pc desc for all scopes in the code and print it.
2996 ResourceMark rm;
2997 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2998 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
2999 continue;
3000
3001 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
3002 while (sd != NULL) {
3003 sd->print_on(tty, p);
3004 sd = sd->sender();
3005 }
3006 }
3007 }
3008
3009 void nmethod::print_dependencies() {
3010 ResourceMark rm;
3011 ttyLocker ttyl; // keep the following output all in one block
3012 tty->print_cr("Dependencies:");
3013 for (Dependencies::DepStream deps(this); deps.next(); ) {
3014 deps.print_dependency();
3015 Klass* ctxk = deps.context_type();
3016 if (ctxk != NULL) {
3017 if (ctxk->is_instance_klass() && InstanceKlass::cast(ctxk)->is_dependent_nmethod(this)) {
3018 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name());
3019 }
3020 }
3021 deps.log_dependency(); // put it into the xml log also
3022 }
3023 }
3024
3025
3026 void nmethod::print_relocations() {
3027 ResourceMark m; // in case methods get printed via the debugger
3028 tty->print_cr("relocations:");
3029 RelocIterator iter(this);
3030 iter.print();
3031 if (UseRelocIndex) {
3032 jint* index_end = (jint*)relocation_end() - 1;
3033 jint index_size = *index_end;
3034 jint* index_start = (jint*)( (address)index_end - index_size );
3035 tty->print_cr(" index @" INTPTR_FORMAT ": index_size=%d", p2i(index_start), index_size);
3036 if (index_size > 0) {
3037 jint* ip;
3038 for (ip = index_start; ip+2 <= index_end; ip += 2)
3039 tty->print_cr(" (%d %d) addr=" INTPTR_FORMAT " @" INTPTR_FORMAT,
3040 ip[0],
3041 ip[1],
3042 p2i(header_end()+ip[0]),
3043 p2i(relocation_begin()-1+ip[1]));
3044 for (; ip < index_end; ip++)
3045 tty->print_cr(" (%d ?)", ip[0]);
3046 tty->print_cr(" @" INTPTR_FORMAT ": index_size=%d", p2i(ip), *ip);
3047 ip++;
3048 tty->print_cr("reloc_end @" INTPTR_FORMAT ":", p2i(ip));
3049 }
3050 }
3051 }
3052
3053
3054 void nmethod::print_pcs() {
3055 ResourceMark m; // in case methods get printed via debugger
3056 tty->print_cr("pc-bytecode offsets:");
3057 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
3058 p->print(this);
3059 }
3060 }
3061
3062 void nmethod::print_recorded_oops() {
3063 tty->print_cr("Recorded oops:");
3064 for (int i = 0; i < oops_count(); i++) {
3065 oop o = oop_at(i);
3066 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(o));
3067 if (o == (oop)Universe::non_oop_word()) {
3068 tty->print("non-oop word");
3069 } else {
3070 o->print_value();
3071 }
3072 tty->cr();
3073 }
3074 }
3075
3076 void nmethod::print_recorded_metadata() {
3077 tty->print_cr("Recorded metadata:");
3078 for (int i = 0; i < metadata_count(); i++) {
3079 Metadata* m = metadata_at(i);
3080 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(m));
3081 if (m == (Metadata*)Universe::non_oop_word()) {
3082 tty->print("non-metadata word");
3083 } else {
3084 m->print_value_on_maybe_null(tty);
3085 }
3086 tty->cr();
3087 }
3088 }
3089
3090 #endif // PRODUCT
3091
3092 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
3093 RelocIterator iter(this, begin, end);
3094 bool have_one = false;
3095 while (iter.next()) {
3096 have_one = true;
3097 switch (iter.type()) {
3098 case relocInfo::none: return "no_reloc";
3099 case relocInfo::oop_type: {
3100 stringStream st;
3101 oop_Relocation* r = iter.oop_reloc();
3102 oop obj = r->oop_value();
3103 st.print("oop(");
3104 if (obj == NULL) st.print("NULL");
3105 else obj->print_value_on(&st);
3106 st.print(")");
3107 return st.as_string();
3108 }
3109 case relocInfo::metadata_type: {
3110 stringStream st;
3111 metadata_Relocation* r = iter.metadata_reloc();
3112 Metadata* obj = r->metadata_value();
3113 st.print("metadata(");
3114 if (obj == NULL) st.print("NULL");
3115 else obj->print_value_on(&st);
3116 st.print(")");
3117 return st.as_string();
3118 }
3119 case relocInfo::runtime_call_type: {
3120 stringStream st;
3121 st.print("runtime_call");
3122 runtime_call_Relocation* r = iter.runtime_call_reloc();
3123 address dest = r->destination();
3124 CodeBlob* cb = CodeCache::find_blob(dest);
3125 if (cb != NULL) {
3126 st.print(" %s", cb->name());
3127 } else {
3128 ResourceMark rm;
3129 const int buflen = 1024;
3130 char* buf = NEW_RESOURCE_ARRAY(char, buflen);
3131 int offset;
3132 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) {
3133 st.print(" %s", buf);
3134 if (offset != 0) {
3135 st.print("+%d", offset);
3136 }
3137 }
3138 }
3139 return st.as_string();
3140 }
3141 case relocInfo::virtual_call_type: {
3142 stringStream st;
3143 st.print_raw("virtual_call");
3144 virtual_call_Relocation* r = iter.virtual_call_reloc();
3145 Method* m = r->method_value();
3146 if (m != NULL) {
3147 assert(m->is_method(), "");
3148 m->print_short_name(&st);
3149 }
3150 return st.as_string();
3151 }
3152 case relocInfo::opt_virtual_call_type: {
3153 stringStream st;
3154 st.print_raw("optimized virtual_call");
3155 opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc();
3156 Method* m = r->method_value();
3157 if (m != NULL) {
3158 assert(m->is_method(), "");
3159 m->print_short_name(&st);
3160 }
3161 return st.as_string();
3162 }
3163 case relocInfo::static_call_type: {
3164 stringStream st;
3165 st.print_raw("static_call");
3166 static_call_Relocation* r = iter.static_call_reloc();
3167 Method* m = r->method_value();
3168 if (m != NULL) {
3169 assert(m->is_method(), "");
3170 m->print_short_name(&st);
3171 }
3172 return st.as_string();
3173 }
3174 case relocInfo::static_stub_type: return "static_stub";
3175 case relocInfo::external_word_type: return "external_word";
3176 case relocInfo::internal_word_type: return "internal_word";
3177 case relocInfo::section_word_type: return "section_word";
3178 case relocInfo::poll_type: return "poll";
3179 case relocInfo::poll_return_type: return "poll_return";
3180 case relocInfo::type_mask: return "type_bit_mask";
3181 }
3182 }
3183 return have_one ? "other" : NULL;
3184 }
3185
3186 // Return a the last scope in (begin..end]
3187 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
3188 PcDesc* p = pc_desc_near(begin+1);
3189 if (p != NULL && p->real_pc(this) <= end) {
3190 return new ScopeDesc(this, p->scope_decode_offset(),
3191 p->obj_decode_offset(), p->should_reexecute(), p->rethrow_exception(),
3192 p->return_oop());
3193 }
3194 return NULL;
3195 }
3196
3197 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const {
3198 if (block_begin == entry_point()) stream->print_cr("[Entry Point]");
3199 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]");
3200 if (JVMCI_ONLY(_exception_offset >= 0 &&) block_begin == exception_begin()) stream->print_cr("[Exception Handler]");
3201 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]");
3202 if (JVMCI_ONLY(_deoptimize_offset >= 0 &&) block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]");
3203
3204 if (has_method_handle_invokes())
3205 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]");
3206
3207 if (block_begin == consts_begin()) stream->print_cr("[Constants]");
3208
3209 if (block_begin == entry_point()) {
3210 methodHandle m = method();
3211 if (m.not_null()) {
3212 stream->print(" # ");
3213 m->print_value_on(stream);
3214 stream->cr();
3215 }
3216 if (m.not_null() && !is_osr_method()) {
3217 ResourceMark rm;
3218 int sizeargs = m->size_of_parameters();
3219 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
3220 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
3221 {
3222 int sig_index = 0;
3223 if (!m->is_static())
3224 sig_bt[sig_index++] = T_OBJECT; // 'this'
3225 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) {
3226 BasicType t = ss.type();
3227 sig_bt[sig_index++] = t;
3228 if (type2size[t] == 2) {
3229 sig_bt[sig_index++] = T_VOID;
3230 } else {
3231 assert(type2size[t] == 1, "size is 1 or 2");
3232 }
3233 }
3234 assert(sig_index == sizeargs, "");
3235 }
3236 const char* spname = "sp"; // make arch-specific?
3237 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false);
3238 int stack_slot_offset = this->frame_size() * wordSize;
3239 int tab1 = 14, tab2 = 24;
3240 int sig_index = 0;
3241 int arg_index = (m->is_static() ? 0 : -1);
3242 bool did_old_sp = false;
3243 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) {
3244 bool at_this = (arg_index == -1);
3245 bool at_old_sp = false;
3246 BasicType t = (at_this ? T_OBJECT : ss.type());
3247 assert(t == sig_bt[sig_index], "sigs in sync");
3248 if (at_this)
3249 stream->print(" # this: ");
3250 else
3251 stream->print(" # parm%d: ", arg_index);
3252 stream->move_to(tab1);
3253 VMReg fst = regs[sig_index].first();
3254 VMReg snd = regs[sig_index].second();
3255 if (fst->is_reg()) {
3256 stream->print("%s", fst->name());
3257 if (snd->is_valid()) {
3258 stream->print(":%s", snd->name());
3259 }
3260 } else if (fst->is_stack()) {
3261 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
3262 if (offset == stack_slot_offset) at_old_sp = true;
3263 stream->print("[%s+0x%x]", spname, offset);
3264 } else {
3265 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
3266 }
3267 stream->print(" ");
3268 stream->move_to(tab2);
3269 stream->print("= ");
3270 if (at_this) {
3271 m->method_holder()->print_value_on(stream);
3272 } else {
3273 bool did_name = false;
3274 if (!at_this && ss.is_object()) {
3275 Symbol* name = ss.as_symbol_or_null();
3276 if (name != NULL) {
3277 name->print_value_on(stream);
3278 did_name = true;
3279 }
3280 }
3281 if (!did_name)
3282 stream->print("%s", type2name(t));
3283 }
3284 if (at_old_sp) {
3285 stream->print(" (%s of caller)", spname);
3286 did_old_sp = true;
3287 }
3288 stream->cr();
3289 sig_index += type2size[t];
3290 arg_index += 1;
3291 if (!at_this) ss.next();
3292 }
3293 if (!did_old_sp) {
3294 stream->print(" # ");
3295 stream->move_to(tab1);
3296 stream->print("[%s+0x%x]", spname, stack_slot_offset);
3297 stream->print(" (%s of caller)", spname);
3298 stream->cr();
3299 }
3300 }
3301 }
3302 }
3303
3304 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) {
3305 // First, find an oopmap in (begin, end].
3306 // We use the odd half-closed interval so that oop maps and scope descs
3307 // which are tied to the byte after a call are printed with the call itself.
3308 address base = code_begin();
3309 ImmutableOopMapSet* oms = oop_maps();
3310 if (oms != NULL) {
3311 for (int i = 0, imax = oms->count(); i < imax; i++) {
3312 const ImmutableOopMapPair* pair = oms->pair_at(i);
3313 const ImmutableOopMap* om = pair->get_from(oms);
3314 address pc = base + pair->pc_offset();
3315 if (pc > begin) {
3316 if (pc <= end) {
3317 st->move_to(column);
3318 st->print("; ");
3319 om->print_on(st);
3320 }
3321 break;
3322 }
3323 }
3324 }
3325
3326 // Print any debug info present at this pc.
3327 ScopeDesc* sd = scope_desc_in(begin, end);
3328 if (sd != NULL) {
3329 st->move_to(column);
3330 if (sd->bci() == SynchronizationEntryBCI) {
3331 st->print(";*synchronization entry");
3332 } else {
3333 if (sd->method() == NULL) {
3334 st->print("method is NULL");
3335 } else if (sd->method()->is_native()) {
3336 st->print("method is native");
3337 } else {
3338 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci());
3339 st->print(";*%s", Bytecodes::name(bc));
3340 switch (bc) {
3341 case Bytecodes::_invokevirtual:
3342 case Bytecodes::_invokespecial:
3343 case Bytecodes::_invokestatic:
3344 case Bytecodes::_invokeinterface:
3345 {
3346 Bytecode_invoke invoke(sd->method(), sd->bci());
3347 st->print(" ");
3348 if (invoke.name() != NULL)
3349 invoke.name()->print_symbol_on(st);
3350 else
3351 st->print("<UNKNOWN>");
3352 break;
3353 }
3354 case Bytecodes::_getfield:
3355 case Bytecodes::_putfield:
3356 case Bytecodes::_getstatic:
3357 case Bytecodes::_putstatic:
3358 {
3359 Bytecode_field field(sd->method(), sd->bci());
3360 st->print(" ");
3361 if (field.name() != NULL)
3362 field.name()->print_symbol_on(st);
3363 else
3364 st->print("<UNKNOWN>");
3365 }
3366 }
3367 }
3368 st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop());
3369 }
3370
3371 // Print all scopes
3372 for (;sd != NULL; sd = sd->sender()) {
3373 st->move_to(column);
3374 st->print("; -");
3375 if (sd->method() == NULL) {
3376 st->print("method is NULL");
3377 } else {
3378 sd->method()->print_short_name(st);
3379 }
3380 int lineno = sd->method()->line_number_from_bci(sd->bci());
3381 if (lineno != -1) {
3382 st->print("@%d (line %d)", sd->bci(), lineno);
3383 } else {
3384 st->print("@%d", sd->bci());
3385 }
3386 st->cr();
3387 }
3388 }
3389
3390 // Print relocation information
3391 const char* str = reloc_string_for(begin, end);
3392 if (str != NULL) {
3393 if (sd != NULL) st->cr();
3394 st->move_to(column);
3395 st->print("; {%s}", str);
3396 }
3397 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin());
3398 if (cont_offset != 0) {
3399 st->move_to(column);
3400 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset));
3401 }
3402
3403 }
3404
3405 #ifndef PRODUCT
3406
3407 void nmethod::print_value_on(outputStream* st) const {
3408 st->print("nmethod");
3409 print_on(st, NULL);
3410 }
3411
3412 void nmethod::print_calls(outputStream* st) {
3413 RelocIterator iter(this);
3414 while (iter.next()) {
3415 switch (iter.type()) {
3416 case relocInfo::virtual_call_type:
3417 case relocInfo::opt_virtual_call_type: {
3418 VerifyMutexLocker mc(CompiledIC_lock);
3419 CompiledIC_at(&iter)->print();
3420 break;
3421 }
3422 case relocInfo::static_call_type:
3423 st->print_cr("Static call at " INTPTR_FORMAT, p2i(iter.reloc()->addr()));
3424 compiledStaticCall_at(iter.reloc())->print();
3425 break;
3426 }
3427 }
3428 }
3429
3430 void nmethod::print_handler_table() {
3431 ExceptionHandlerTable(this).print();
3432 }
3433
3434 void nmethod::print_nul_chk_table() {
3435 ImplicitExceptionTable(this).print(code_begin());
3436 }
3437
3438 void nmethod::print_statistics() {
3439 ttyLocker ttyl;
3440 if (xtty != NULL) xtty->head("statistics type='nmethod'");
3441 native_nmethod_stats.print_native_nmethod_stats();
3442 #ifdef COMPILER1
3443 c1_java_nmethod_stats.print_nmethod_stats("C1");
3444 #endif
3445 #ifdef COMPILER2
3446 c2_java_nmethod_stats.print_nmethod_stats("C2");
3447 #endif
3448 #if INCLUDE_JVMCI
3449 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI");
3450 #endif
3451 #ifdef SHARK
3452 shark_java_nmethod_stats.print_nmethod_stats("Shark");
3453 #endif
3454 unknown_java_nmethod_stats.print_nmethod_stats("Unknown");
3455 DebugInformationRecorder::print_statistics();
3456 #ifndef PRODUCT
3457 pc_nmethod_stats.print_pc_stats();
3458 #endif
3459 Dependencies::print_statistics();
3460 if (xtty != NULL) xtty->tail("statistics");
3461 }
3462
3463 #endif // !PRODUCT
3464
3465 #if INCLUDE_JVMCI
3466 void nmethod::clear_jvmci_installed_code() {
3467 // write_ref_method_pre/post can only be safely called at a
3468 // safepoint or while holding the CodeCache_lock
3469 assert(CodeCache_lock->is_locked() ||
3470 SafepointSynchronize::is_at_safepoint(), "should be performed under a lock for consistency");
3471 if (_jvmci_installed_code != NULL) {
3472 // This must be done carefully to maintain nmethod remembered sets properly
3473 BarrierSet* bs = Universe::heap()->barrier_set();
3474 bs->write_ref_nmethod_pre(&_jvmci_installed_code, this);
3475 _jvmci_installed_code = NULL;
3476 bs->write_ref_nmethod_post(&_jvmci_installed_code, this);
3477 }
3478 }
3479
3480 void nmethod::maybe_invalidate_installed_code() {
3481 assert(Patching_lock->is_locked() ||
3482 SafepointSynchronize::is_at_safepoint(), "should be performed under a lock for consistency");
3483 oop installed_code = jvmci_installed_code();
3484 if (installed_code != NULL) {
3485 nmethod* nm = (nmethod*)InstalledCode::address(installed_code);
3486 if (nm == NULL || nm != this) {
3487 // The link has been broken or the InstalledCode instance is
3488 // associated with another nmethod so do nothing.
3489 return;
3490 }
3491 if (!is_alive()) {
3492 // Break the link between nmethod and InstalledCode such that the nmethod
3493 // can subsequently be flushed safely. The link must be maintained while
3494 // the method could have live activations since invalidateInstalledCode
3495 // might want to invalidate all existing activations.
3496 InstalledCode::set_address(installed_code, 0);
3497 InstalledCode::set_entryPoint(installed_code, 0);
3498 } else if (is_not_entrant()) {
3499 // Remove the entry point so any invocation will fail but keep
3500 // the address link around that so that existing activations can
3501 // be invalidated.
3502 InstalledCode::set_entryPoint(installed_code, 0);
3503 }
3504 }
3505 }
3506
3507 void nmethod::invalidate_installed_code(Handle installedCode, TRAPS) {
3508 if (installedCode() == NULL) {
3509 THROW(vmSymbols::java_lang_NullPointerException());
3510 }
3511 jlong nativeMethod = InstalledCode::address(installedCode);
3512 nmethod* nm = (nmethod*)nativeMethod;
3513 if (nm == NULL) {
3514 // Nothing to do
3515 return;
3516 }
3517
3518 nmethodLocker nml(nm);
3519 #ifdef ASSERT
3520 {
3521 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
3522 // This relationship can only be checked safely under a lock
3523 assert(nm == NULL || !nm->is_alive() || nm->jvmci_installed_code() == installedCode(), "sanity check");
3524 }
3525 #endif
3526
3527 if (nm->is_alive()) {
3528 // The nmethod state machinery maintains the link between the
3529 // HotSpotInstalledCode and nmethod* so as long as the nmethod appears to be
3530 // alive assume there is work to do and deoptimize the nmethod.
3531 nm->mark_for_deoptimization();
3532 VM_Deoptimize op;
3533 VMThread::execute(&op);
3534 }
3535
3536 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
3537 // Check that it's still associated with the same nmethod and break
3538 // the link if it is.
3539 if (InstalledCode::address(installedCode) == nativeMethod) {
3540 InstalledCode::set_address(installedCode, 0);
3541 }
3542 }
3543
3544 char* nmethod::jvmci_installed_code_name(char* buf, size_t buflen) {
3545 if (!this->is_compiled_by_jvmci()) {
3546 return NULL;
3547 }
3548 oop installedCode = this->jvmci_installed_code();
3549 if (installedCode != NULL) {
3550 oop installedCodeName = NULL;
3551 if (installedCode->is_a(InstalledCode::klass())) {
3552 installedCodeName = InstalledCode::name(installedCode);
3553 }
3554 if (installedCodeName != NULL) {
3555 return java_lang_String::as_utf8_string(installedCodeName, buf, (int)buflen);
3556 } else {
3557 jio_snprintf(buf, buflen, "null");
3558 return buf;
3559 }
3560 }
3561 jio_snprintf(buf, buflen, "noInstalledCode");
3562 return buf;
3563 }
3564 #endif
3565
3566 Method* nmethod::attached_method(address call_instr) {
3567 assert(code_contains(call_instr), "not part of the nmethod");
3568 RelocIterator iter(this, call_instr, call_instr + 1);
3569 while (iter.next()) {
3570 if (iter.addr() == call_instr) {
3571 switch(iter.type()) {
3572 case relocInfo::static_call_type: return iter.static_call_reloc()->method_value();
3573 case relocInfo::opt_virtual_call_type: return iter.opt_virtual_call_reloc()->method_value();
3574 case relocInfo::virtual_call_type: return iter.virtual_call_reloc()->method_value();
3575 }
3576 }
3577 }
3578 return NULL; // not found
3579 }
3580
3581 Method* nmethod::attached_method_before_pc(address pc) {
3582 if (NativeCall::is_call_before(pc)) {
3583 NativeCall* ncall = nativeCall_before(pc);
3584 return attached_method(ncall->instruction_address());
3585 }
3586 return NULL; // not a call
3587 }
3588