1 /*
2 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "code/codeCache.hpp"
27 #include "code/compiledIC.hpp"
28 #include "code/dependencies.hpp"
29 #include "code/nativeInst.hpp"
30 #include "code/nmethod.hpp"
31 #include "code/scopeDesc.hpp"
32 #include "compiler/abstractCompiler.hpp"
33 #include "compiler/compileBroker.hpp"
34 #include "compiler/compileLog.hpp"
35 #include "compiler/compilerDirectives.hpp"
36 #include "compiler/disassembler.hpp"
37 #include "interpreter/bytecode.hpp"
38 #include "oops/methodData.hpp"
39 #include "oops/oop.inline.hpp"
40 #include "prims/jvmtiRedefineClassesTrace.hpp"
41 #include "prims/jvmtiImpl.hpp"
42 #include "runtime/atomic.inline.hpp"
43 #include "runtime/orderAccess.inline.hpp"
44 #include "runtime/os.hpp"
45 #include "runtime/sharedRuntime.hpp"
46 #include "runtime/sweeper.hpp"
47 #include "utilities/resourceHash.hpp"
48 #include "utilities/dtrace.hpp"
49 #include "utilities/events.hpp"
50 #include "utilities/xmlstream.hpp"
51 #include "logging/log.hpp"
52 #ifdef TARGET_ARCH_x86
53 # include "nativeInst_x86.hpp"
54 #endif
55 #ifdef TARGET_ARCH_sparc
56 # include "nativeInst_sparc.hpp"
57 #endif
58 #ifdef TARGET_ARCH_zero
59 # include "nativeInst_zero.hpp"
60 #endif
61 #ifdef TARGET_ARCH_arm
62 # include "nativeInst_arm.hpp"
63 #endif
64 #ifdef TARGET_ARCH_ppc
65 # include "nativeInst_ppc.hpp"
66 #endif
67 #ifdef SHARK
68 #include "shark/sharkCompiler.hpp"
69 #endif
70 #if INCLUDE_JVMCI
71 #include "jvmci/jvmciJavaClasses.hpp"
72 #endif
73
74 unsigned char nmethod::_global_unloading_clock = 0;
75
76 #ifdef DTRACE_ENABLED
77
78 // Only bother with this argument setup if dtrace is available
79
80 #define DTRACE_METHOD_UNLOAD_PROBE(method) \
81 { \
82 Method* m = (method); \
83 if (m != NULL) { \
84 Symbol* klass_name = m->klass_name(); \
85 Symbol* name = m->name(); \
86 Symbol* signature = m->signature(); \
87 HOTSPOT_COMPILED_METHOD_UNLOAD( \
88 (char *) klass_name->bytes(), klass_name->utf8_length(), \
89 (char *) name->bytes(), name->utf8_length(), \
90 (char *) signature->bytes(), signature->utf8_length()); \
91 } \
92 }
93
94 #else // ndef DTRACE_ENABLED
95
96 #define DTRACE_METHOD_UNLOAD_PROBE(method)
97
98 #endif
99
100 bool nmethod::is_compiled_by_c1() const {
101 if (compiler() == NULL) {
102 return false;
103 }
104 return compiler()->is_c1();
105 }
106 bool nmethod::is_compiled_by_jvmci() const {
107 if (compiler() == NULL || method() == NULL) return false; // can happen during debug printing
108 if (is_native_method()) return false;
109 return compiler()->is_jvmci();
110 }
111 bool nmethod::is_compiled_by_c2() const {
112 if (compiler() == NULL) {
113 return false;
114 }
115 return compiler()->is_c2();
116 }
117 bool nmethod::is_compiled_by_shark() const {
118 if (compiler() == NULL) {
119 return false;
120 }
121 return compiler()->is_shark();
122 }
123
124
125
126 //---------------------------------------------------------------------------------
127 // NMethod statistics
128 // They are printed under various flags, including:
129 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation.
130 // (In the latter two cases, they like other stats are printed to the log only.)
131
132 #ifndef PRODUCT
133 // These variables are put into one block to reduce relocations
134 // and make it simpler to print from the debugger.
135 struct java_nmethod_stats_struct {
136 int nmethod_count;
137 int total_size;
138 int relocation_size;
139 int consts_size;
140 int insts_size;
141 int stub_size;
142 int scopes_data_size;
143 int scopes_pcs_size;
144 int dependencies_size;
145 int handler_table_size;
146 int nul_chk_table_size;
147 int oops_size;
148 int metadata_size;
149
150 void note_nmethod(nmethod* nm) {
151 nmethod_count += 1;
152 total_size += nm->size();
153 relocation_size += nm->relocation_size();
154 consts_size += nm->consts_size();
155 insts_size += nm->insts_size();
156 stub_size += nm->stub_size();
157 oops_size += nm->oops_size();
158 metadata_size += nm->metadata_size();
159 scopes_data_size += nm->scopes_data_size();
160 scopes_pcs_size += nm->scopes_pcs_size();
161 dependencies_size += nm->dependencies_size();
162 handler_table_size += nm->handler_table_size();
163 nul_chk_table_size += nm->nul_chk_table_size();
164 }
165 void print_nmethod_stats(const char* name) {
166 if (nmethod_count == 0) return;
167 tty->print_cr("Statistics for %d bytecoded nmethods for %s:", nmethod_count, name);
168 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size);
169 if (nmethod_count != 0) tty->print_cr(" header = " SIZE_FORMAT, nmethod_count * sizeof(nmethod));
170 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size);
171 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size);
172 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size);
173 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size);
174 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size);
175 if (metadata_size != 0) tty->print_cr(" metadata = %d", metadata_size);
176 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size);
177 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size);
178 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size);
179 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size);
180 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size);
181 }
182 };
183
184 struct native_nmethod_stats_struct {
185 int native_nmethod_count;
186 int native_total_size;
187 int native_relocation_size;
188 int native_insts_size;
189 int native_oops_size;
190 int native_metadata_size;
191 void note_native_nmethod(nmethod* nm) {
192 native_nmethod_count += 1;
193 native_total_size += nm->size();
194 native_relocation_size += nm->relocation_size();
195 native_insts_size += nm->insts_size();
196 native_oops_size += nm->oops_size();
197 native_metadata_size += nm->metadata_size();
198 }
199 void print_native_nmethod_stats() {
200 if (native_nmethod_count == 0) return;
201 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count);
202 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size);
203 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size);
204 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size);
205 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size);
206 if (native_metadata_size != 0) tty->print_cr(" N. metadata = %d", native_metadata_size);
207 }
208 };
209
210 struct pc_nmethod_stats_struct {
211 int pc_desc_resets; // number of resets (= number of caches)
212 int pc_desc_queries; // queries to nmethod::find_pc_desc
213 int pc_desc_approx; // number of those which have approximate true
214 int pc_desc_repeats; // number of _pc_descs[0] hits
215 int pc_desc_hits; // number of LRU cache hits
216 int pc_desc_tests; // total number of PcDesc examinations
217 int pc_desc_searches; // total number of quasi-binary search steps
218 int pc_desc_adds; // number of LUR cache insertions
219
220 void print_pc_stats() {
221 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query",
222 pc_desc_queries,
223 (double)(pc_desc_tests + pc_desc_searches)
224 / pc_desc_queries);
225 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d",
226 pc_desc_resets,
227 pc_desc_queries, pc_desc_approx,
228 pc_desc_repeats, pc_desc_hits,
229 pc_desc_tests, pc_desc_searches, pc_desc_adds);
230 }
231 };
232
233 #ifdef COMPILER1
234 static java_nmethod_stats_struct c1_java_nmethod_stats;
235 #endif
236 #ifdef COMPILER2
237 static java_nmethod_stats_struct c2_java_nmethod_stats;
238 #endif
239 #if INCLUDE_JVMCI
240 static java_nmethod_stats_struct jvmci_java_nmethod_stats;
241 #endif
242 #ifdef SHARK
243 static java_nmethod_stats_struct shark_java_nmethod_stats;
244 #endif
245 static java_nmethod_stats_struct unknown_java_nmethod_stats;
246
247 static native_nmethod_stats_struct native_nmethod_stats;
248 static pc_nmethod_stats_struct pc_nmethod_stats;
249
250 static void note_java_nmethod(nmethod* nm) {
251 #ifdef COMPILER1
252 if (nm->is_compiled_by_c1()) {
253 c1_java_nmethod_stats.note_nmethod(nm);
254 } else
255 #endif
256 #ifdef COMPILER2
257 if (nm->is_compiled_by_c2()) {
258 c2_java_nmethod_stats.note_nmethod(nm);
259 } else
260 #endif
261 #if INCLUDE_JVMCI
262 if (nm->is_compiled_by_jvmci()) {
263 jvmci_java_nmethod_stats.note_nmethod(nm);
264 } else
265 #endif
266 #ifdef SHARK
267 if (nm->is_compiled_by_shark()) {
268 shark_java_nmethod_stats.note_nmethod(nm);
269 } else
270 #endif
271 {
272 unknown_java_nmethod_stats.note_nmethod(nm);
273 }
274 }
275 #endif // !PRODUCT
276
277 //---------------------------------------------------------------------------------
278
279
280 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) {
281 assert(pc != NULL, "Must be non null");
282 assert(exception.not_null(), "Must be non null");
283 assert(handler != NULL, "Must be non null");
284
285 _count = 0;
286 _exception_type = exception->klass();
287 _next = NULL;
288
289 add_address_and_handler(pc,handler);
290 }
291
292
293 address ExceptionCache::match(Handle exception, address pc) {
294 assert(pc != NULL,"Must be non null");
295 assert(exception.not_null(),"Must be non null");
296 if (exception->klass() == exception_type()) {
297 return (test_address(pc));
298 }
299
300 return NULL;
301 }
302
303
304 bool ExceptionCache::match_exception_with_space(Handle exception) {
305 assert(exception.not_null(),"Must be non null");
306 if (exception->klass() == exception_type() && count() < cache_size) {
307 return true;
308 }
309 return false;
310 }
311
312
313 address ExceptionCache::test_address(address addr) {
314 for (int i=0; i<count(); i++) {
315 if (pc_at(i) == addr) {
316 return handler_at(i);
317 }
318 }
319 return NULL;
320 }
321
322
323 bool ExceptionCache::add_address_and_handler(address addr, address handler) {
324 if (test_address(addr) == handler) return true;
325 if (count() < cache_size) {
326 set_pc_at(count(),addr);
327 set_handler_at(count(), handler);
328 increment_count();
329 return true;
330 }
331 return false;
332 }
333
334
335 // private method for handling exception cache
336 // These methods are private, and used to manipulate the exception cache
337 // directly.
338 ExceptionCache* nmethod::exception_cache_entry_for_exception(Handle exception) {
339 ExceptionCache* ec = exception_cache();
340 while (ec != NULL) {
341 if (ec->match_exception_with_space(exception)) {
342 return ec;
343 }
344 ec = ec->next();
345 }
346 return NULL;
347 }
348
349
350 //-----------------------------------------------------------------------------
351
352
353 // Helper used by both find_pc_desc methods.
354 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) {
355 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_tests);
356 if (!approximate)
357 return pc->pc_offset() == pc_offset;
358 else
359 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset();
360 }
361
362 void PcDescCache::reset_to(PcDesc* initial_pc_desc) {
363 if (initial_pc_desc == NULL) {
364 _pc_descs[0] = NULL; // native method; no PcDescs at all
365 return;
366 }
367 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_resets);
368 // reset the cache by filling it with benign (non-null) values
369 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel");
370 for (int i = 0; i < cache_size; i++)
371 _pc_descs[i] = initial_pc_desc;
372 }
373
374 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) {
375 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_queries);
376 NOT_PRODUCT(if (approximate) ++pc_nmethod_stats.pc_desc_approx);
377
378 // Note: one might think that caching the most recently
379 // read value separately would be a win, but one would be
380 // wrong. When many threads are updating it, the cache
381 // line it's in would bounce between caches, negating
382 // any benefit.
383
384 // In order to prevent race conditions do not load cache elements
385 // repeatedly, but use a local copy:
386 PcDesc* res;
387
388 // Step one: Check the most recently added value.
389 res = _pc_descs[0];
390 if (res == NULL) return NULL; // native method; no PcDescs at all
391 if (match_desc(res, pc_offset, approximate)) {
392 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_repeats);
393 return res;
394 }
395
396 // Step two: Check the rest of the LRU cache.
397 for (int i = 1; i < cache_size; ++i) {
398 res = _pc_descs[i];
399 if (res->pc_offset() < 0) break; // optimization: skip empty cache
400 if (match_desc(res, pc_offset, approximate)) {
401 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_hits);
402 return res;
403 }
404 }
405
406 // Report failure.
407 return NULL;
408 }
409
410 void PcDescCache::add_pc_desc(PcDesc* pc_desc) {
411 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_adds);
412 // Update the LRU cache by shifting pc_desc forward.
413 for (int i = 0; i < cache_size; i++) {
414 PcDesc* next = _pc_descs[i];
415 _pc_descs[i] = pc_desc;
416 pc_desc = next;
417 }
418 }
419
420 // adjust pcs_size so that it is a multiple of both oopSize and
421 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple
422 // of oopSize, then 2*sizeof(PcDesc) is)
423 static int adjust_pcs_size(int pcs_size) {
424 int nsize = round_to(pcs_size, oopSize);
425 if ((nsize % sizeof(PcDesc)) != 0) {
426 nsize = pcs_size + sizeof(PcDesc);
427 }
428 assert((nsize % oopSize) == 0, "correct alignment");
429 return nsize;
430 }
431
432 //-----------------------------------------------------------------------------
433
434
435 void nmethod::add_exception_cache_entry(ExceptionCache* new_entry) {
436 assert(ExceptionCache_lock->owned_by_self(),"Must hold the ExceptionCache_lock");
437 assert(new_entry != NULL,"Must be non null");
438 assert(new_entry->next() == NULL, "Must be null");
439
440 if (exception_cache() != NULL) {
441 new_entry->set_next(exception_cache());
442 }
443 set_exception_cache(new_entry);
444 }
445
446 void nmethod::clean_exception_cache(BoolObjectClosure* is_alive) {
447 ExceptionCache* prev = NULL;
448 ExceptionCache* curr = exception_cache();
449
450 while (curr != NULL) {
451 ExceptionCache* next = curr->next();
452
453 Klass* ex_klass = curr->exception_type();
454 if (ex_klass != NULL && !ex_klass->is_loader_alive(is_alive)) {
455 if (prev == NULL) {
456 set_exception_cache(next);
457 } else {
458 prev->set_next(next);
459 }
460 delete curr;
461 // prev stays the same.
462 } else {
463 prev = curr;
464 }
465
466 curr = next;
467 }
468 }
469
470 // public method for accessing the exception cache
471 // These are the public access methods.
472 address nmethod::handler_for_exception_and_pc(Handle exception, address pc) {
473 // We never grab a lock to read the exception cache, so we may
474 // have false negatives. This is okay, as it can only happen during
475 // the first few exception lookups for a given nmethod.
476 ExceptionCache* ec = exception_cache();
477 while (ec != NULL) {
478 address ret_val;
479 if ((ret_val = ec->match(exception,pc)) != NULL) {
480 return ret_val;
481 }
482 ec = ec->next();
483 }
484 return NULL;
485 }
486
487
488 void nmethod::add_handler_for_exception_and_pc(Handle exception, address pc, address handler) {
489 // There are potential race conditions during exception cache updates, so we
490 // must own the ExceptionCache_lock before doing ANY modifications. Because
491 // we don't lock during reads, it is possible to have several threads attempt
492 // to update the cache with the same data. We need to check for already inserted
493 // copies of the current data before adding it.
494
495 MutexLocker ml(ExceptionCache_lock);
496 ExceptionCache* target_entry = exception_cache_entry_for_exception(exception);
497
498 if (target_entry == NULL || !target_entry->add_address_and_handler(pc,handler)) {
499 target_entry = new ExceptionCache(exception,pc,handler);
500 add_exception_cache_entry(target_entry);
501 }
502 }
503
504
505 //-------------end of code for ExceptionCache--------------
506
507
508 int nmethod::total_size() const {
509 return
510 consts_size() +
511 insts_size() +
512 stub_size() +
513 scopes_data_size() +
514 scopes_pcs_size() +
515 handler_table_size() +
516 nul_chk_table_size();
517 }
518
519 const char* nmethod::compile_kind() const {
520 if (is_osr_method()) return "osr";
521 if (method() != NULL && is_native_method()) return "c2n";
522 return NULL;
523 }
524
525 // Fill in default values for various flag fields
526 void nmethod::init_defaults() {
527 _state = in_use;
528 _unloading_clock = 0;
529 _marked_for_reclamation = 0;
530 _has_flushed_dependencies = 0;
531 _has_unsafe_access = 0;
532 _has_method_handle_invokes = 0;
533 _lazy_critical_native = 0;
534 _has_wide_vectors = 0;
535 _marked_for_deoptimization = 0;
536 _lock_count = 0;
537 _stack_traversal_mark = 0;
538 _unload_reported = false; // jvmti state
539
540 #ifdef ASSERT
541 _oops_are_stale = false;
542 #endif
543
544 _oops_do_mark_link = NULL;
545 _jmethod_id = NULL;
546 _osr_link = NULL;
547 if (UseG1GC) {
548 _unloading_next = NULL;
549 } else {
550 _scavenge_root_link = NULL;
551 }
552 _scavenge_root_state = 0;
553 _compiler = NULL;
554 #if INCLUDE_RTM_OPT
555 _rtm_state = NoRTM;
556 #endif
557 #if INCLUDE_JVMCI
558 _jvmci_installed_code = NULL;
559 _speculation_log = NULL;
560 #endif
561 }
562
563 nmethod* nmethod::new_native_nmethod(const methodHandle& method,
564 int compile_id,
565 CodeBuffer *code_buffer,
566 int vep_offset,
567 int frame_complete,
568 int frame_size,
569 ByteSize basic_lock_owner_sp_offset,
570 ByteSize basic_lock_sp_offset,
571 OopMapSet* oop_maps) {
572 code_buffer->finalize_oop_references(method);
573 // create nmethod
574 nmethod* nm = NULL;
575 {
576 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
577 int native_nmethod_size = allocation_size(code_buffer, sizeof(nmethod));
578 CodeOffsets offsets;
579 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
580 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
581 nm = new (native_nmethod_size, CompLevel_none) nmethod(method(), native_nmethod_size,
582 compile_id, &offsets,
583 code_buffer, frame_size,
584 basic_lock_owner_sp_offset,
585 basic_lock_sp_offset, oop_maps);
586 NOT_PRODUCT(if (nm != NULL) native_nmethod_stats.note_native_nmethod(nm));
587 }
588 // verify nmethod
589 debug_only(if (nm) nm->verify();) // might block
590
591 if (nm != NULL) {
592 nm->log_new_nmethod();
593 }
594
595 return nm;
596 }
597
598 nmethod* nmethod::new_nmethod(const methodHandle& method,
599 int compile_id,
600 int entry_bci,
601 CodeOffsets* offsets,
602 int orig_pc_offset,
603 DebugInformationRecorder* debug_info,
604 Dependencies* dependencies,
605 CodeBuffer* code_buffer, int frame_size,
606 OopMapSet* oop_maps,
607 ExceptionHandlerTable* handler_table,
608 ImplicitExceptionTable* nul_chk_table,
609 AbstractCompiler* compiler,
610 int comp_level
611 #if INCLUDE_JVMCI
612 , Handle installed_code,
613 Handle speculationLog
614 #endif
615 )
616 {
617 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
618 code_buffer->finalize_oop_references(method);
619 // create nmethod
620 nmethod* nm = NULL;
621 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
622 int nmethod_size =
623 allocation_size(code_buffer, sizeof(nmethod))
624 + adjust_pcs_size(debug_info->pcs_size())
625 + round_to(dependencies->size_in_bytes() , oopSize)
626 + round_to(handler_table->size_in_bytes(), oopSize)
627 + round_to(nul_chk_table->size_in_bytes(), oopSize)
628 + round_to(debug_info->data_size() , oopSize);
629
630 nm = new (nmethod_size, comp_level)
631 nmethod(method(), nmethod_size, compile_id, entry_bci, offsets,
632 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size,
633 oop_maps,
634 handler_table,
635 nul_chk_table,
636 compiler,
637 comp_level
638 #if INCLUDE_JVMCI
639 , installed_code,
640 speculationLog
641 #endif
642 );
643
644 if (nm != NULL) {
645 // To make dependency checking during class loading fast, record
646 // the nmethod dependencies in the classes it is dependent on.
647 // This allows the dependency checking code to simply walk the
648 // class hierarchy above the loaded class, checking only nmethods
649 // which are dependent on those classes. The slow way is to
650 // check every nmethod for dependencies which makes it linear in
651 // the number of methods compiled. For applications with a lot
652 // classes the slow way is too slow.
653 for (Dependencies::DepStream deps(nm); deps.next(); ) {
654 if (deps.type() == Dependencies::call_site_target_value) {
655 // CallSite dependencies are managed on per-CallSite instance basis.
656 oop call_site = deps.argument_oop(0);
657 MethodHandles::add_dependent_nmethod(call_site, nm);
658 } else {
659 Klass* klass = deps.context_type();
660 if (klass == NULL) {
661 continue; // ignore things like evol_method
662 }
663 // record this nmethod as dependent on this klass
664 InstanceKlass::cast(klass)->add_dependent_nmethod(nm);
665 }
666 }
667 NOT_PRODUCT(if (nm != NULL) note_java_nmethod(nm));
668 }
669 }
670 // Do verification and logging outside CodeCache_lock.
671 if (nm != NULL) {
672 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
673 DEBUG_ONLY(nm->verify();)
674 nm->log_new_nmethod();
675 }
676 return nm;
677 }
678
679 // For native wrappers
680 nmethod::nmethod(
681 Method* method,
682 int nmethod_size,
683 int compile_id,
684 CodeOffsets* offsets,
685 CodeBuffer* code_buffer,
686 int frame_size,
687 ByteSize basic_lock_owner_sp_offset,
688 ByteSize basic_lock_sp_offset,
689 OopMapSet* oop_maps )
690 : CodeBlob("native nmethod", code_buffer, sizeof(nmethod),
691 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps),
692 _native_receiver_sp_offset(basic_lock_owner_sp_offset),
693 _native_basic_lock_sp_offset(basic_lock_sp_offset)
694 {
695 {
696 debug_only(NoSafepointVerifier nsv;)
697 assert_locked_or_safepoint(CodeCache_lock);
698
699 init_defaults();
700 _method = method;
701 _entry_bci = InvocationEntryBci;
702 // We have no exception handler or deopt handler make the
703 // values something that will never match a pc like the nmethod vtable entry
704 _exception_offset = 0;
705 _deoptimize_offset = 0;
706 _deoptimize_mh_offset = 0;
707 _orig_pc_offset = 0;
708
709 _consts_offset = data_offset();
710 _stub_offset = data_offset();
711 _oops_offset = data_offset();
712 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize);
713 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize);
714 _scopes_pcs_offset = _scopes_data_offset;
715 _dependencies_offset = _scopes_pcs_offset;
716 _handler_table_offset = _dependencies_offset;
717 _nul_chk_table_offset = _handler_table_offset;
718 _nmethod_end_offset = _nul_chk_table_offset;
719 _compile_id = compile_id;
720 _comp_level = CompLevel_none;
721 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
722 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
723 _osr_entry_point = NULL;
724 _exception_cache = NULL;
725 _pc_desc_cache.reset_to(NULL);
726 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
727
728 code_buffer->copy_values_to(this);
729 if (ScavengeRootsInCode) {
730 if (detect_scavenge_root_oops()) {
731 CodeCache::add_scavenge_root_nmethod(this);
732 }
733 Universe::heap()->register_nmethod(this);
734 }
735 debug_only(verify_scavenge_root_oops());
736 CodeCache::commit(this);
737 }
738
739 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
740 ttyLocker ttyl; // keep the following output all in one block
741 // This output goes directly to the tty, not the compiler log.
742 // To enable tools to match it up with the compilation activity,
743 // be sure to tag this tty output with the compile ID.
744 if (xtty != NULL) {
745 xtty->begin_head("print_native_nmethod");
746 xtty->method(_method);
747 xtty->stamp();
748 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
749 }
750 // print the header part first
751 print();
752 // then print the requested information
753 if (PrintNativeNMethods) {
754 print_code();
755 if (oop_maps != NULL) {
756 oop_maps->print();
757 }
758 }
759 if (PrintRelocations) {
760 print_relocations();
761 }
762 if (xtty != NULL) {
763 xtty->tail("print_native_nmethod");
764 }
765 }
766 }
767
768 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () {
769 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level));
770 }
771
772 nmethod::nmethod(
773 Method* method,
774 int nmethod_size,
775 int compile_id,
776 int entry_bci,
777 CodeOffsets* offsets,
778 int orig_pc_offset,
779 DebugInformationRecorder* debug_info,
780 Dependencies* dependencies,
781 CodeBuffer *code_buffer,
782 int frame_size,
783 OopMapSet* oop_maps,
784 ExceptionHandlerTable* handler_table,
785 ImplicitExceptionTable* nul_chk_table,
786 AbstractCompiler* compiler,
787 int comp_level
788 #if INCLUDE_JVMCI
789 , Handle installed_code,
790 Handle speculation_log
791 #endif
792 )
793 : CodeBlob("nmethod", code_buffer, sizeof(nmethod),
794 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps),
795 _native_receiver_sp_offset(in_ByteSize(-1)),
796 _native_basic_lock_sp_offset(in_ByteSize(-1))
797 {
798 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
799 {
800 debug_only(NoSafepointVerifier nsv;)
801 assert_locked_or_safepoint(CodeCache_lock);
802
803 init_defaults();
804 _method = method;
805 _entry_bci = entry_bci;
806 _compile_id = compile_id;
807 _comp_level = comp_level;
808 _compiler = compiler;
809 _orig_pc_offset = orig_pc_offset;
810 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
811
812 // Section offsets
813 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts());
814 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs());
815
816 #if INCLUDE_JVMCI
817 _jvmci_installed_code = installed_code();
818 _speculation_log = (instanceOop)speculation_log();
819
820 if (compiler->is_jvmci()) {
821 // JVMCI might not produce any stub sections
822 if (offsets->value(CodeOffsets::Exceptions) != -1) {
823 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions);
824 } else {
825 _exception_offset = -1;
826 }
827 if (offsets->value(CodeOffsets::Deopt) != -1) {
828 _deoptimize_offset = code_offset() + offsets->value(CodeOffsets::Deopt);
829 } else {
830 _deoptimize_offset = -1;
831 }
832 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
833 _deoptimize_mh_offset = code_offset() + offsets->value(CodeOffsets::DeoptMH);
834 } else {
835 _deoptimize_mh_offset = -1;
836 }
837 } else {
838 #endif
839 // Exception handler and deopt handler are in the stub section
840 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set");
841 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set");
842
843 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
844 _deoptimize_offset = _stub_offset + offsets->value(CodeOffsets::Deopt);
845 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
846 _deoptimize_mh_offset = _stub_offset + offsets->value(CodeOffsets::DeoptMH);
847 } else {
848 _deoptimize_mh_offset = -1;
849 #if INCLUDE_JVMCI
850 }
851 #endif
852 }
853 if (offsets->value(CodeOffsets::UnwindHandler) != -1) {
854 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler);
855 } else {
856 _unwind_handler_offset = -1;
857 }
858
859 _oops_offset = data_offset();
860 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize);
861 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize);
862
863 _scopes_pcs_offset = _scopes_data_offset + round_to(debug_info->data_size (), oopSize);
864 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
865 _handler_table_offset = _dependencies_offset + round_to(dependencies->size_in_bytes (), oopSize);
866 _nul_chk_table_offset = _handler_table_offset + round_to(handler_table->size_in_bytes(), oopSize);
867 _nmethod_end_offset = _nul_chk_table_offset + round_to(nul_chk_table->size_in_bytes(), oopSize);
868
869 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
870 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
871 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry);
872 _exception_cache = NULL;
873 _pc_desc_cache.reset_to(scopes_pcs_begin());
874
875 // Copy contents of ScopeDescRecorder to nmethod
876 code_buffer->copy_values_to(this);
877 debug_info->copy_to(this);
878 dependencies->copy_to(this);
879 if (ScavengeRootsInCode) {
880 if (detect_scavenge_root_oops()) {
881 CodeCache::add_scavenge_root_nmethod(this);
882 }
883 Universe::heap()->register_nmethod(this);
884 }
885 debug_only(verify_scavenge_root_oops());
886
887 CodeCache::commit(this);
888
889 // Copy contents of ExceptionHandlerTable to nmethod
890 handler_table->copy_to(this);
891 nul_chk_table->copy_to(this);
892
893 // we use the information of entry points to find out if a method is
894 // static or non static
895 assert(compiler->is_c2() || compiler->is_jvmci() ||
896 _method->is_static() == (entry_point() == _verified_entry_point),
897 " entry points must be same for static methods and vice versa");
898 }
899 }
900
901 // Print a short set of xml attributes to identify this nmethod. The
902 // output should be embedded in some other element.
903 void nmethod::log_identity(xmlStream* log) const {
904 log->print(" compile_id='%d'", compile_id());
905 const char* nm_kind = compile_kind();
906 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind);
907 if (compiler() != NULL) {
908 log->print(" compiler='%s'", compiler()->name());
909 }
910 if (TieredCompilation) {
911 log->print(" level='%d'", comp_level());
912 }
913 }
914
915
916 #define LOG_OFFSET(log, name) \
917 if (p2i(name##_end()) - p2i(name##_begin())) \
918 log->print(" " XSTR(name) "_offset='" INTX_FORMAT "'" , \
919 p2i(name##_begin()) - p2i(this))
920
921
922 void nmethod::log_new_nmethod() const {
923 if (LogCompilation && xtty != NULL) {
924 ttyLocker ttyl;
925 HandleMark hm;
926 xtty->begin_elem("nmethod");
927 log_identity(xtty);
928 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size());
929 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this));
930
931 LOG_OFFSET(xtty, relocation);
932 LOG_OFFSET(xtty, consts);
933 LOG_OFFSET(xtty, insts);
934 LOG_OFFSET(xtty, stub);
935 LOG_OFFSET(xtty, scopes_data);
936 LOG_OFFSET(xtty, scopes_pcs);
937 LOG_OFFSET(xtty, dependencies);
938 LOG_OFFSET(xtty, handler_table);
939 LOG_OFFSET(xtty, nul_chk_table);
940 LOG_OFFSET(xtty, oops);
941 LOG_OFFSET(xtty, metadata);
942
943 xtty->method(method());
944 xtty->stamp();
945 xtty->end_elem();
946 }
947 }
948
949 #undef LOG_OFFSET
950
951
952 // Print out more verbose output usually for a newly created nmethod.
953 void nmethod::print_on(outputStream* st, const char* msg) const {
954 if (st != NULL) {
955 ttyLocker ttyl;
956 if (WizardMode) {
957 CompileTask::print(st, this, msg, /*short_form:*/ true);
958 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this));
959 } else {
960 CompileTask::print(st, this, msg, /*short_form:*/ false);
961 }
962 }
963 }
964
965
966 void nmethod::print_nmethod(bool printmethod) {
967 ttyLocker ttyl; // keep the following output all in one block
968 if (xtty != NULL) {
969 xtty->begin_head("print_nmethod");
970 xtty->stamp();
971 xtty->end_head();
972 }
973 // print the header part first
974 print();
975 // then print the requested information
976 if (printmethod) {
977 print_code();
978 print_pcs();
979 if (oop_maps()) {
980 oop_maps()->print();
981 }
982 }
983 if (printmethod || PrintDebugInfo || CompilerOracle::has_option_string(_method, "PrintDebugInfo")) {
984 print_scopes();
985 }
986 if (printmethod || PrintRelocations || CompilerOracle::has_option_string(_method, "PrintRelocations")) {
987 print_relocations();
988 }
989 if (printmethod || PrintDependencies || CompilerOracle::has_option_string(_method, "PrintDependencies")) {
990 print_dependencies();
991 }
992 if (printmethod || PrintExceptionHandlers) {
993 print_handler_table();
994 print_nul_chk_table();
995 }
996 if (printmethod) {
997 print_recorded_oops();
998 print_recorded_metadata();
999 }
1000 if (xtty != NULL) {
1001 xtty->tail("print_nmethod");
1002 }
1003 }
1004
1005
1006 // Promote one word from an assembly-time handle to a live embedded oop.
1007 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
1008 if (handle == NULL ||
1009 // As a special case, IC oops are initialized to 1 or -1.
1010 handle == (jobject) Universe::non_oop_word()) {
1011 (*dest) = (oop) handle;
1012 } else {
1013 (*dest) = JNIHandles::resolve_non_null(handle);
1014 }
1015 }
1016
1017
1018 // Have to have the same name because it's called by a template
1019 void nmethod::copy_values(GrowableArray<jobject>* array) {
1020 int length = array->length();
1021 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
1022 oop* dest = oops_begin();
1023 for (int index = 0 ; index < length; index++) {
1024 initialize_immediate_oop(&dest[index], array->at(index));
1025 }
1026
1027 // Now we can fix up all the oops in the code. We need to do this
1028 // in the code because the assembler uses jobjects as placeholders.
1029 // The code and relocations have already been initialized by the
1030 // CodeBlob constructor, so it is valid even at this early point to
1031 // iterate over relocations and patch the code.
1032 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true);
1033 }
1034
1035 void nmethod::copy_values(GrowableArray<Metadata*>* array) {
1036 int length = array->length();
1037 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough");
1038 Metadata** dest = metadata_begin();
1039 for (int index = 0 ; index < length; index++) {
1040 dest[index] = array->at(index);
1041 }
1042 }
1043
1044 bool nmethod::is_at_poll_return(address pc) {
1045 RelocIterator iter(this, pc, pc+1);
1046 while (iter.next()) {
1047 if (iter.type() == relocInfo::poll_return_type)
1048 return true;
1049 }
1050 return false;
1051 }
1052
1053
1054 bool nmethod::is_at_poll_or_poll_return(address pc) {
1055 RelocIterator iter(this, pc, pc+1);
1056 while (iter.next()) {
1057 relocInfo::relocType t = iter.type();
1058 if (t == relocInfo::poll_return_type || t == relocInfo::poll_type)
1059 return true;
1060 }
1061 return false;
1062 }
1063
1064
1065 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) {
1066 // re-patch all oop-bearing instructions, just in case some oops moved
1067 RelocIterator iter(this, begin, end);
1068 while (iter.next()) {
1069 if (iter.type() == relocInfo::oop_type) {
1070 oop_Relocation* reloc = iter.oop_reloc();
1071 if (initialize_immediates && reloc->oop_is_immediate()) {
1072 oop* dest = reloc->oop_addr();
1073 initialize_immediate_oop(dest, (jobject) *dest);
1074 }
1075 // Refresh the oop-related bits of this instruction.
1076 reloc->fix_oop_relocation();
1077 } else if (iter.type() == relocInfo::metadata_type) {
1078 metadata_Relocation* reloc = iter.metadata_reloc();
1079 reloc->fix_metadata_relocation();
1080 }
1081 }
1082 }
1083
1084
1085 void nmethod::verify_oop_relocations() {
1086 // Ensure sure that the code matches the current oop values
1087 RelocIterator iter(this, NULL, NULL);
1088 while (iter.next()) {
1089 if (iter.type() == relocInfo::oop_type) {
1090 oop_Relocation* reloc = iter.oop_reloc();
1091 if (!reloc->oop_is_immediate()) {
1092 reloc->verify_oop_relocation();
1093 }
1094 }
1095 }
1096 }
1097
1098
1099 ScopeDesc* nmethod::scope_desc_at(address pc) {
1100 PcDesc* pd = pc_desc_at(pc);
1101 guarantee(pd != NULL, "scope must be present");
1102 return new ScopeDesc(this, pd->scope_decode_offset(),
1103 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(),
1104 pd->return_oop());
1105 }
1106
1107
1108 void nmethod::clear_inline_caches() {
1109 assert(SafepointSynchronize::is_at_safepoint(), "cleaning of IC's only allowed at safepoint");
1110 if (is_zombie()) {
1111 return;
1112 }
1113
1114 RelocIterator iter(this);
1115 while (iter.next()) {
1116 iter.reloc()->clear_inline_cache();
1117 }
1118 }
1119
1120 // Clear ICStubs of all compiled ICs
1121 void nmethod::clear_ic_stubs() {
1122 assert_locked_or_safepoint(CompiledIC_lock);
1123 RelocIterator iter(this);
1124 while(iter.next()) {
1125 if (iter.type() == relocInfo::virtual_call_type) {
1126 CompiledIC* ic = CompiledIC_at(&iter);
1127 ic->clear_ic_stub();
1128 }
1129 }
1130 }
1131
1132
1133 void nmethod::cleanup_inline_caches() {
1134 assert_locked_or_safepoint(CompiledIC_lock);
1135
1136 // If the method is not entrant or zombie then a JMP is plastered over the
1137 // first few bytes. If an oop in the old code was there, that oop
1138 // should not get GC'd. Skip the first few bytes of oops on
1139 // not-entrant methods.
1140 address low_boundary = verified_entry_point();
1141 if (!is_in_use()) {
1142 low_boundary += NativeJump::instruction_size;
1143 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1144 // This means that the low_boundary is going to be a little too high.
1145 // This shouldn't matter, since oops of non-entrant methods are never used.
1146 // In fact, why are we bothering to look at oops in a non-entrant method??
1147 }
1148
1149 // Find all calls in an nmethod and clear the ones that point to non-entrant,
1150 // zombie and unloaded nmethods.
1151 ResourceMark rm;
1152 RelocIterator iter(this, low_boundary);
1153 while(iter.next()) {
1154 switch(iter.type()) {
1155 case relocInfo::virtual_call_type:
1156 case relocInfo::opt_virtual_call_type: {
1157 CompiledIC *ic = CompiledIC_at(&iter);
1158 // Ok, to lookup references to zombies here
1159 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
1160 if( cb != NULL && cb->is_nmethod() ) {
1161 nmethod* nm = (nmethod*)cb;
1162 // Clean inline caches pointing to zombie, non-entrant and unloaded methods
1163 if (!nm->is_in_use() || (nm->method()->code() != nm)) ic->set_to_clean(is_alive());
1164 }
1165 break;
1166 }
1167 case relocInfo::static_call_type: {
1168 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
1169 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
1170 if( cb != NULL && cb->is_nmethod() ) {
1171 nmethod* nm = (nmethod*)cb;
1172 // Clean inline caches pointing to zombie, non-entrant and unloaded methods
1173 if (!nm->is_in_use() || (nm->method()->code() != nm)) csc->set_to_clean();
1174 }
1175 break;
1176 }
1177 }
1178 }
1179 }
1180
1181 void nmethod::verify_clean_inline_caches() {
1182 assert_locked_or_safepoint(CompiledIC_lock);
1183
1184 // If the method is not entrant or zombie then a JMP is plastered over the
1185 // first few bytes. If an oop in the old code was there, that oop
1186 // should not get GC'd. Skip the first few bytes of oops on
1187 // not-entrant methods.
1188 address low_boundary = verified_entry_point();
1189 if (!is_in_use()) {
1190 low_boundary += NativeJump::instruction_size;
1191 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1192 // This means that the low_boundary is going to be a little too high.
1193 // This shouldn't matter, since oops of non-entrant methods are never used.
1194 // In fact, why are we bothering to look at oops in a non-entrant method??
1195 }
1196
1197 ResourceMark rm;
1198 RelocIterator iter(this, low_boundary);
1199 while(iter.next()) {
1200 switch(iter.type()) {
1201 case relocInfo::virtual_call_type:
1202 case relocInfo::opt_virtual_call_type: {
1203 CompiledIC *ic = CompiledIC_at(&iter);
1204 // Ok, to lookup references to zombies here
1205 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
1206 if( cb != NULL && cb->is_nmethod() ) {
1207 nmethod* nm = (nmethod*)cb;
1208 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
1209 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1210 assert(ic->is_clean(), "IC should be clean");
1211 }
1212 }
1213 break;
1214 }
1215 case relocInfo::static_call_type: {
1216 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
1217 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
1218 if( cb != NULL && cb->is_nmethod() ) {
1219 nmethod* nm = (nmethod*)cb;
1220 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
1221 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1222 assert(csc->is_clean(), "IC should be clean");
1223 }
1224 }
1225 break;
1226 }
1227 }
1228 }
1229 }
1230
1231 int nmethod::verify_icholder_relocations() {
1232 int count = 0;
1233
1234 RelocIterator iter(this);
1235 while(iter.next()) {
1236 if (iter.type() == relocInfo::virtual_call_type) {
1237 if (CompiledIC::is_icholder_call_site(iter.virtual_call_reloc())) {
1238 CompiledIC *ic = CompiledIC_at(&iter);
1239 if (TraceCompiledIC) {
1240 tty->print("noticed icholder " INTPTR_FORMAT " ", p2i(ic->cached_icholder()));
1241 ic->print();
1242 }
1243 assert(ic->cached_icholder() != NULL, "must be non-NULL");
1244 count++;
1245 }
1246 }
1247 }
1248
1249 return count;
1250 }
1251
1252 // This is a private interface with the sweeper.
1253 void nmethod::mark_as_seen_on_stack() {
1254 assert(is_alive(), "Must be an alive method");
1255 // Set the traversal mark to ensure that the sweeper does 2
1256 // cleaning passes before moving to zombie.
1257 set_stack_traversal_mark(NMethodSweeper::traversal_count());
1258 }
1259
1260 // Tell if a non-entrant method can be converted to a zombie (i.e.,
1261 // there are no activations on the stack, not in use by the VM,
1262 // and not in use by the ServiceThread)
1263 bool nmethod::can_convert_to_zombie() {
1264 assert(is_not_entrant(), "must be a non-entrant method");
1265
1266 // Since the nmethod sweeper only does partial sweep the sweeper's traversal
1267 // count can be greater than the stack traversal count before it hits the
1268 // nmethod for the second time.
1269 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count() &&
1270 !is_locked_by_vm();
1271 }
1272
1273 void nmethod::inc_decompile_count() {
1274 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return;
1275 // Could be gated by ProfileTraps, but do not bother...
1276 Method* m = method();
1277 if (m == NULL) return;
1278 MethodData* mdo = m->method_data();
1279 if (mdo == NULL) return;
1280 // There is a benign race here. See comments in methodData.hpp.
1281 mdo->inc_decompile_count();
1282 }
1283
1284 void nmethod::increase_unloading_clock() {
1285 _global_unloading_clock++;
1286 if (_global_unloading_clock == 0) {
1287 // _nmethods are allocated with _unloading_clock == 0,
1288 // so 0 is never used as a clock value.
1289 _global_unloading_clock = 1;
1290 }
1291 }
1292
1293 void nmethod::set_unloading_clock(unsigned char unloading_clock) {
1294 OrderAccess::release_store((volatile jubyte*)&_unloading_clock, unloading_clock);
1295 }
1296
1297 unsigned char nmethod::unloading_clock() {
1298 return (unsigned char)OrderAccess::load_acquire((volatile jubyte*)&_unloading_clock);
1299 }
1300
1301 void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) {
1302
1303 post_compiled_method_unload();
1304
1305 // Since this nmethod is being unloaded, make sure that dependencies
1306 // recorded in instanceKlasses get flushed and pass non-NULL closure to
1307 // indicate that this work is being done during a GC.
1308 assert(Universe::heap()->is_gc_active(), "should only be called during gc");
1309 assert(is_alive != NULL, "Should be non-NULL");
1310 // A non-NULL is_alive closure indicates that this is being called during GC.
1311 flush_dependencies(is_alive);
1312
1313 // Break cycle between nmethod & method
1314 if (log_is_enabled(Trace, classunload)) {
1315 outputStream* log = LogHandle(classunload)::trace_stream();
1316 log->print_cr("making nmethod " INTPTR_FORMAT
1317 " unloadable, Method*(" INTPTR_FORMAT
1318 "), cause(" INTPTR_FORMAT ")",
1319 p2i(this), p2i(_method), p2i(cause));
1320 if (!Universe::heap()->is_gc_active())
1321 cause->klass()->print_on(log);
1322 }
1323 // Unlink the osr method, so we do not look this up again
1324 if (is_osr_method()) {
1325 invalidate_osr_method();
1326 }
1327 // If _method is already NULL the Method* is about to be unloaded,
1328 // so we don't have to break the cycle. Note that it is possible to
1329 // have the Method* live here, in case we unload the nmethod because
1330 // it is pointing to some oop (other than the Method*) being unloaded.
1331 if (_method != NULL) {
1332 // OSR methods point to the Method*, but the Method* does not
1333 // point back!
1334 if (_method->code() == this) {
1335 _method->clear_code(); // Break a cycle
1336 }
1337 _method = NULL; // Clear the method of this dead nmethod
1338 }
1339
1340 // Make the class unloaded - i.e., change state and notify sweeper
1341 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
1342 if (is_in_use()) {
1343 // Transitioning directly from live to unloaded -- so
1344 // we need to force a cache clean-up; remember this
1345 // for later on.
1346 CodeCache::set_needs_cache_clean(true);
1347 }
1348
1349 // Unregister must be done before the state change
1350 Universe::heap()->unregister_nmethod(this);
1351
1352 _state = unloaded;
1353
1354 // Log the unloading.
1355 log_state_change();
1356
1357 #if INCLUDE_JVMCI
1358 // The method can only be unloaded after the pointer to the installed code
1359 // Java wrapper is no longer alive. Here we need to clear out this weak
1360 // reference to the dead object. Nulling out the reference has to happen
1361 // after the method is unregistered since the original value may be still
1362 // tracked by the rset.
1363 maybe_invalidate_installed_code();
1364 // Clear these out after the nmethod has been unregistered and any
1365 // updates to the InstalledCode instance have been performed.
1366 _jvmci_installed_code = NULL;
1367 _speculation_log = NULL;
1368 #endif
1369
1370 // The Method* is gone at this point
1371 assert(_method == NULL, "Tautology");
1372
1373 set_osr_link(NULL);
1374 //set_scavenge_root_link(NULL); // done by prune_scavenge_root_nmethods
1375 NMethodSweeper::report_state_change(this);
1376 }
1377
1378 void nmethod::invalidate_osr_method() {
1379 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
1380 // Remove from list of active nmethods
1381 if (method() != NULL)
1382 method()->method_holder()->remove_osr_nmethod(this);
1383 }
1384
1385 void nmethod::log_state_change() const {
1386 if (LogCompilation) {
1387 if (xtty != NULL) {
1388 ttyLocker ttyl; // keep the following output all in one block
1389 if (_state == unloaded) {
1390 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'",
1391 os::current_thread_id());
1392 } else {
1393 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s",
1394 os::current_thread_id(),
1395 (_state == zombie ? " zombie='1'" : ""));
1396 }
1397 log_identity(xtty);
1398 xtty->stamp();
1399 xtty->end_elem();
1400 }
1401 }
1402 if (PrintCompilation && _state != unloaded) {
1403 print_on(tty, _state == zombie ? "made zombie" : "made not entrant");
1404 }
1405 }
1406
1407 /**
1408 * Common functionality for both make_not_entrant and make_zombie
1409 */
1410 bool nmethod::make_not_entrant_or_zombie(unsigned int state) {
1411 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant");
1412 assert(!is_zombie(), "should not already be a zombie");
1413
1414 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below.
1415 nmethodLocker nml(this);
1416 methodHandle the_method(method());
1417 NoSafepointVerifier nsv;
1418
1419 // during patching, depending on the nmethod state we must notify the GC that
1420 // code has been unloaded, unregistering it. We cannot do this right while
1421 // holding the Patching_lock because we need to use the CodeCache_lock. This
1422 // would be prone to deadlocks.
1423 // This flag is used to remember whether we need to later lock and unregister.
1424 bool nmethod_needs_unregister = false;
1425
1426 {
1427 // invalidate osr nmethod before acquiring the patching lock since
1428 // they both acquire leaf locks and we don't want a deadlock.
1429 // This logic is equivalent to the logic below for patching the
1430 // verified entry point of regular methods.
1431 if (is_osr_method()) {
1432 // this effectively makes the osr nmethod not entrant
1433 invalidate_osr_method();
1434 }
1435
1436 // Enter critical section. Does not block for safepoint.
1437 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1438
1439 if (_state == state) {
1440 // another thread already performed this transition so nothing
1441 // to do, but return false to indicate this.
1442 return false;
1443 }
1444
1445 // The caller can be calling the method statically or through an inline
1446 // cache call.
1447 if (!is_osr_method() && !is_not_entrant()) {
1448 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
1449 SharedRuntime::get_handle_wrong_method_stub());
1450 }
1451
1452 if (is_in_use()) {
1453 // It's a true state change, so mark the method as decompiled.
1454 // Do it only for transition from alive.
1455 inc_decompile_count();
1456 }
1457
1458 // If the state is becoming a zombie, signal to unregister the nmethod with
1459 // the heap.
1460 // This nmethod may have already been unloaded during a full GC.
1461 if ((state == zombie) && !is_unloaded()) {
1462 nmethod_needs_unregister = true;
1463 }
1464
1465 // Must happen before state change. Otherwise we have a race condition in
1466 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately
1467 // transition its state from 'not_entrant' to 'zombie' without having to wait
1468 // for stack scanning.
1469 if (state == not_entrant) {
1470 mark_as_seen_on_stack();
1471 OrderAccess::storestore();
1472 }
1473
1474 // Change state
1475 _state = state;
1476
1477 // Log the transition once
1478 log_state_change();
1479
1480 // Invalidate while holding the patching lock
1481 JVMCI_ONLY(maybe_invalidate_installed_code());
1482
1483 // Remove nmethod from method.
1484 // We need to check if both the _code and _from_compiled_code_entry_point
1485 // refer to this nmethod because there is a race in setting these two fields
1486 // in Method* as seen in bugid 4947125.
1487 // If the vep() points to the zombie nmethod, the memory for the nmethod
1488 // could be flushed and the compiler and vtable stubs could still call
1489 // through it.
1490 if (method() != NULL && (method()->code() == this ||
1491 method()->from_compiled_entry() == verified_entry_point())) {
1492 HandleMark hm;
1493 method()->clear_code();
1494 }
1495 } // leave critical region under Patching_lock
1496
1497 // When the nmethod becomes zombie it is no longer alive so the
1498 // dependencies must be flushed. nmethods in the not_entrant
1499 // state will be flushed later when the transition to zombie
1500 // happens or they get unloaded.
1501 if (state == zombie) {
1502 {
1503 // Flushing dependecies must be done before any possible
1504 // safepoint can sneak in, otherwise the oops used by the
1505 // dependency logic could have become stale.
1506 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1507 if (nmethod_needs_unregister) {
1508 Universe::heap()->unregister_nmethod(this);
1509 #ifdef JVMCI
1510 _jvmci_installed_code = NULL;
1511 _speculation_log = NULL;
1512 #endif
1513 }
1514 flush_dependencies(NULL);
1515 }
1516
1517 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload
1518 // event and it hasn't already been reported for this nmethod then
1519 // report it now. The event may have been reported earilier if the GC
1520 // marked it for unloading). JvmtiDeferredEventQueue support means
1521 // we no longer go to a safepoint here.
1522 post_compiled_method_unload();
1523
1524 #ifdef ASSERT
1525 // It's no longer safe to access the oops section since zombie
1526 // nmethods aren't scanned for GC.
1527 _oops_are_stale = true;
1528 #endif
1529 // the Method may be reclaimed by class unloading now that the
1530 // nmethod is in zombie state
1531 set_method(NULL);
1532 } else {
1533 assert(state == not_entrant, "other cases may need to be handled differently");
1534 }
1535
1536 if (TraceCreateZombies) {
1537 ResourceMark m;
1538 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");
1539 }
1540
1541 NMethodSweeper::report_state_change(this);
1542 return true;
1543 }
1544
1545 void nmethod::flush() {
1546 // Note that there are no valid oops in the nmethod anymore.
1547 assert(is_zombie() || (is_osr_method() && is_unloaded()), "must be a zombie method");
1548 assert(is_marked_for_reclamation() || (is_osr_method() && is_unloaded()), "must be marked for reclamation");
1549
1550 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed");
1551 assert_locked_or_safepoint(CodeCache_lock);
1552
1553 // completely deallocate this method
1554 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, p2i(this));
1555 if (PrintMethodFlushing) {
1556 tty->print_cr("*flushing nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT
1557 "/Free CodeCache:" SIZE_FORMAT "Kb",
1558 _compile_id, p2i(this), CodeCache::blob_count(),
1559 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024);
1560 }
1561
1562 // We need to deallocate any ExceptionCache data.
1563 // Note that we do not need to grab the nmethod lock for this, it
1564 // better be thread safe if we're disposing of it!
1565 ExceptionCache* ec = exception_cache();
1566 set_exception_cache(NULL);
1567 while(ec != NULL) {
1568 ExceptionCache* next = ec->next();
1569 delete ec;
1570 ec = next;
1571 }
1572
1573 if (on_scavenge_root_list()) {
1574 CodeCache::drop_scavenge_root_nmethod(this);
1575 }
1576
1577 #ifdef SHARK
1578 ((SharkCompiler *) compiler())->free_compiled_method(insts_begin());
1579 #endif // SHARK
1580
1581 ((CodeBlob*)(this))->flush();
1582
1583 CodeCache::free(this);
1584 }
1585
1586 //
1587 // Notify all classes this nmethod is dependent on that it is no
1588 // longer dependent. This should only be called in two situations.
1589 // First, when a nmethod transitions to a zombie all dependents need
1590 // to be clear. Since zombification happens at a safepoint there's no
1591 // synchronization issues. The second place is a little more tricky.
1592 // During phase 1 of mark sweep class unloading may happen and as a
1593 // result some nmethods may get unloaded. In this case the flushing
1594 // of dependencies must happen during phase 1 since after GC any
1595 // dependencies in the unloaded nmethod won't be updated, so
1596 // traversing the dependency information in unsafe. In that case this
1597 // function is called with a non-NULL argument and this function only
1598 // notifies instanceKlasses that are reachable
1599
1600 void nmethod::flush_dependencies(BoolObjectClosure* is_alive) {
1601 assert_locked_or_safepoint(CodeCache_lock);
1602 assert(Universe::heap()->is_gc_active() == (is_alive != NULL),
1603 "is_alive is non-NULL if and only if we are called during GC");
1604 if (!has_flushed_dependencies()) {
1605 set_has_flushed_dependencies();
1606 for (Dependencies::DepStream deps(this); deps.next(); ) {
1607 if (deps.type() == Dependencies::call_site_target_value) {
1608 // CallSite dependencies are managed on per-CallSite instance basis.
1609 oop call_site = deps.argument_oop(0);
1610 MethodHandles::remove_dependent_nmethod(call_site, this);
1611 } else {
1612 Klass* klass = deps.context_type();
1613 if (klass == NULL) {
1614 continue; // ignore things like evol_method
1615 }
1616 // During GC the is_alive closure is non-NULL, and is used to
1617 // determine liveness of dependees that need to be updated.
1618 if (is_alive == NULL || klass->is_loader_alive(is_alive)) {
1619 // The GC defers deletion of this entry, since there might be multiple threads
1620 // iterating over the _dependencies graph. Other call paths are single-threaded
1621 // and may delete it immediately.
1622 bool delete_immediately = is_alive == NULL;
1623 InstanceKlass::cast(klass)->remove_dependent_nmethod(this, delete_immediately);
1624 }
1625 }
1626 }
1627 }
1628 }
1629
1630
1631 // If this oop is not live, the nmethod can be unloaded.
1632 bool nmethod::can_unload(BoolObjectClosure* is_alive, oop* root, bool unloading_occurred) {
1633 assert(root != NULL, "just checking");
1634 oop obj = *root;
1635 if (obj == NULL || is_alive->do_object_b(obj)) {
1636 return false;
1637 }
1638
1639 // If ScavengeRootsInCode is true, an nmethod might be unloaded
1640 // simply because one of its constant oops has gone dead.
1641 // No actual classes need to be unloaded in order for this to occur.
1642 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading");
1643 make_unloaded(is_alive, obj);
1644 return true;
1645 }
1646
1647 // ------------------------------------------------------------------
1648 // post_compiled_method_load_event
1649 // new method for install_code() path
1650 // Transfer information from compilation to jvmti
1651 void nmethod::post_compiled_method_load_event() {
1652
1653 Method* moop = method();
1654 HOTSPOT_COMPILED_METHOD_LOAD(
1655 (char *) moop->klass_name()->bytes(),
1656 moop->klass_name()->utf8_length(),
1657 (char *) moop->name()->bytes(),
1658 moop->name()->utf8_length(),
1659 (char *) moop->signature()->bytes(),
1660 moop->signature()->utf8_length(),
1661 insts_begin(), insts_size());
1662
1663 if (JvmtiExport::should_post_compiled_method_load() ||
1664 JvmtiExport::should_post_compiled_method_unload()) {
1665 get_and_cache_jmethod_id();
1666 }
1667
1668 if (JvmtiExport::should_post_compiled_method_load()) {
1669 // Let the Service thread (which is a real Java thread) post the event
1670 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1671 JvmtiDeferredEventQueue::enqueue(
1672 JvmtiDeferredEvent::compiled_method_load_event(this));
1673 }
1674 }
1675
1676 jmethodID nmethod::get_and_cache_jmethod_id() {
1677 if (_jmethod_id == NULL) {
1678 // Cache the jmethod_id since it can no longer be looked up once the
1679 // method itself has been marked for unloading.
1680 _jmethod_id = method()->jmethod_id();
1681 }
1682 return _jmethod_id;
1683 }
1684
1685 void nmethod::post_compiled_method_unload() {
1686 if (unload_reported()) {
1687 // During unloading we transition to unloaded and then to zombie
1688 // and the unloading is reported during the first transition.
1689 return;
1690 }
1691
1692 assert(_method != NULL && !is_unloaded(), "just checking");
1693 DTRACE_METHOD_UNLOAD_PROBE(method());
1694
1695 // If a JVMTI agent has enabled the CompiledMethodUnload event then
1696 // post the event. Sometime later this nmethod will be made a zombie
1697 // by the sweeper but the Method* will not be valid at that point.
1698 // If the _jmethod_id is null then no load event was ever requested
1699 // so don't bother posting the unload. The main reason for this is
1700 // that the jmethodID is a weak reference to the Method* so if
1701 // it's being unloaded there's no way to look it up since the weak
1702 // ref will have been cleared.
1703 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) {
1704 assert(!unload_reported(), "already unloaded");
1705 JvmtiDeferredEvent event =
1706 JvmtiDeferredEvent::compiled_method_unload_event(this,
1707 _jmethod_id, insts_begin());
1708 if (SafepointSynchronize::is_at_safepoint()) {
1709 // Don't want to take the queueing lock. Add it as pending and
1710 // it will get enqueued later.
1711 JvmtiDeferredEventQueue::add_pending_event(event);
1712 } else {
1713 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1714 JvmtiDeferredEventQueue::enqueue(event);
1715 }
1716 }
1717
1718 // The JVMTI CompiledMethodUnload event can be enabled or disabled at
1719 // any time. As the nmethod is being unloaded now we mark it has
1720 // having the unload event reported - this will ensure that we don't
1721 // attempt to report the event in the unlikely scenario where the
1722 // event is enabled at the time the nmethod is made a zombie.
1723 set_unload_reported();
1724 }
1725
1726 void static clean_ic_if_metadata_is_dead(CompiledIC *ic, BoolObjectClosure *is_alive) {
1727 if (ic->is_icholder_call()) {
1728 // The only exception is compiledICHolder oops which may
1729 // yet be marked below. (We check this further below).
1730 CompiledICHolder* cichk_oop = ic->cached_icholder();
1731
1732 if (cichk_oop->holder_method()->method_holder()->is_loader_alive(is_alive) &&
1733 cichk_oop->holder_klass()->is_loader_alive(is_alive)) {
1734 return;
1735 }
1736 } else {
1737 Metadata* ic_oop = ic->cached_metadata();
1738 if (ic_oop != NULL) {
1739 if (ic_oop->is_klass()) {
1740 if (((Klass*)ic_oop)->is_loader_alive(is_alive)) {
1741 return;
1742 }
1743 } else if (ic_oop->is_method()) {
1744 if (((Method*)ic_oop)->method_holder()->is_loader_alive(is_alive)) {
1745 return;
1746 }
1747 } else {
1748 ShouldNotReachHere();
1749 }
1750 }
1751 }
1752
1753 ic->set_to_clean();
1754 }
1755
1756 // This is called at the end of the strong tracing/marking phase of a
1757 // GC to unload an nmethod if it contains otherwise unreachable
1758 // oops.
1759
1760 void nmethod::do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred) {
1761 // Make sure the oop's ready to receive visitors
1762 assert(!is_zombie() && !is_unloaded(),
1763 "should not call follow on zombie or unloaded nmethod");
1764
1765 // If the method is not entrant then a JMP is plastered over the
1766 // first few bytes. If an oop in the old code was there, that oop
1767 // should not get GC'd. Skip the first few bytes of oops on
1768 // not-entrant methods.
1769 address low_boundary = verified_entry_point();
1770 if (is_not_entrant()) {
1771 low_boundary += NativeJump::instruction_size;
1772 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1773 // (See comment above.)
1774 }
1775
1776 // The RedefineClasses() API can cause the class unloading invariant
1777 // to no longer be true. See jvmtiExport.hpp for details.
1778 // Also, leave a debugging breadcrumb in local flag.
1779 if (JvmtiExport::has_redefined_a_class()) {
1780 // This set of the unloading_occurred flag is done before the
1781 // call to post_compiled_method_unload() so that the unloading
1782 // of this nmethod is reported.
1783 unloading_occurred = true;
1784 }
1785
1786 // Exception cache
1787 clean_exception_cache(is_alive);
1788
1789 // If class unloading occurred we first iterate over all inline caches and
1790 // clear ICs where the cached oop is referring to an unloaded klass or method.
1791 // The remaining live cached oops will be traversed in the relocInfo::oop_type
1792 // iteration below.
1793 if (unloading_occurred) {
1794 RelocIterator iter(this, low_boundary);
1795 while(iter.next()) {
1796 if (iter.type() == relocInfo::virtual_call_type) {
1797 CompiledIC *ic = CompiledIC_at(&iter);
1798 clean_ic_if_metadata_is_dead(ic, is_alive);
1799 }
1800 }
1801 }
1802
1803 // Compiled code
1804 {
1805 RelocIterator iter(this, low_boundary);
1806 while (iter.next()) {
1807 if (iter.type() == relocInfo::oop_type) {
1808 oop_Relocation* r = iter.oop_reloc();
1809 // In this loop, we must only traverse those oops directly embedded in
1810 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1811 assert(1 == (r->oop_is_immediate()) +
1812 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1813 "oop must be found in exactly one place");
1814 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1815 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) {
1816 return;
1817 }
1818 }
1819 }
1820 }
1821 }
1822
1823
1824 // Scopes
1825 for (oop* p = oops_begin(); p < oops_end(); p++) {
1826 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1827 if (can_unload(is_alive, p, unloading_occurred)) {
1828 return;
1829 }
1830 }
1831
1832 #if INCLUDE_JVMCI
1833 // Follow JVMCI method
1834 BarrierSet* bs = Universe::heap()->barrier_set();
1835 if (_jvmci_installed_code != NULL) {
1836 if (_jvmci_installed_code->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(_jvmci_installed_code)) {
1837 if (!is_alive->do_object_b(_jvmci_installed_code)) {
1838 clear_jvmci_installed_code();
1839 }
1840 } else {
1841 if (can_unload(is_alive, (oop*)&_jvmci_installed_code, unloading_occurred)) {
1842 return;
1843 }
1844 }
1845 }
1846
1847 if (_speculation_log != NULL) {
1848 if (!is_alive->do_object_b(_speculation_log)) {
1849 bs->write_ref_nmethod_pre(&_speculation_log, this);
1850 _speculation_log = NULL;
1851 bs->write_ref_nmethod_post(&_speculation_log, this);
1852 }
1853 }
1854 #endif
1855
1856
1857 // Ensure that all metadata is still alive
1858 verify_metadata_loaders(low_boundary, is_alive);
1859 }
1860
1861 template <class CompiledICorStaticCall>
1862 static bool clean_if_nmethod_is_unloaded(CompiledICorStaticCall *ic, address addr, BoolObjectClosure *is_alive, nmethod* from) {
1863 // Ok, to lookup references to zombies here
1864 CodeBlob *cb = CodeCache::find_blob_unsafe(addr);
1865 if (cb != NULL && cb->is_nmethod()) {
1866 nmethod* nm = (nmethod*)cb;
1867
1868 if (nm->unloading_clock() != nmethod::global_unloading_clock()) {
1869 // The nmethod has not been processed yet.
1870 return true;
1871 }
1872
1873 // Clean inline caches pointing to both zombie and not_entrant methods
1874 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1875 ic->set_to_clean();
1876 assert(ic->is_clean(), "nmethod " PTR_FORMAT "not clean %s", p2i(from), from->method()->name_and_sig_as_C_string());
1877 }
1878 }
1879
1880 return false;
1881 }
1882
1883 static bool clean_if_nmethod_is_unloaded(CompiledIC *ic, BoolObjectClosure *is_alive, nmethod* from) {
1884 return clean_if_nmethod_is_unloaded(ic, ic->ic_destination(), is_alive, from);
1885 }
1886
1887 static bool clean_if_nmethod_is_unloaded(CompiledStaticCall *csc, BoolObjectClosure *is_alive, nmethod* from) {
1888 return clean_if_nmethod_is_unloaded(csc, csc->destination(), is_alive, from);
1889 }
1890
1891 bool nmethod::unload_if_dead_at(RelocIterator* iter_at_oop, BoolObjectClosure *is_alive, bool unloading_occurred) {
1892 assert(iter_at_oop->type() == relocInfo::oop_type, "Wrong relocation type");
1893
1894 oop_Relocation* r = iter_at_oop->oop_reloc();
1895 // Traverse those oops directly embedded in the code.
1896 // Other oops (oop_index>0) are seen as part of scopes_oops.
1897 assert(1 == (r->oop_is_immediate()) +
1898 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1899 "oop must be found in exactly one place");
1900 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1901 // Unload this nmethod if the oop is dead.
1902 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) {
1903 return true;;
1904 }
1905 }
1906
1907 return false;
1908 }
1909
1910
1911 bool nmethod::do_unloading_parallel(BoolObjectClosure* is_alive, bool unloading_occurred) {
1912 ResourceMark rm;
1913
1914 // Make sure the oop's ready to receive visitors
1915 assert(!is_zombie() && !is_unloaded(),
1916 "should not call follow on zombie or unloaded nmethod");
1917
1918 // If the method is not entrant then a JMP is plastered over the
1919 // first few bytes. If an oop in the old code was there, that oop
1920 // should not get GC'd. Skip the first few bytes of oops on
1921 // not-entrant methods.
1922 address low_boundary = verified_entry_point();
1923 if (is_not_entrant()) {
1924 low_boundary += NativeJump::instruction_size;
1925 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1926 // (See comment above.)
1927 }
1928
1929 // The RedefineClasses() API can cause the class unloading invariant
1930 // to no longer be true. See jvmtiExport.hpp for details.
1931 // Also, leave a debugging breadcrumb in local flag.
1932 if (JvmtiExport::has_redefined_a_class()) {
1933 // This set of the unloading_occurred flag is done before the
1934 // call to post_compiled_method_unload() so that the unloading
1935 // of this nmethod is reported.
1936 unloading_occurred = true;
1937 }
1938
1939 // Exception cache
1940 clean_exception_cache(is_alive);
1941
1942 bool is_unloaded = false;
1943 bool postponed = false;
1944
1945 RelocIterator iter(this, low_boundary);
1946 while(iter.next()) {
1947
1948 switch (iter.type()) {
1949
1950 case relocInfo::virtual_call_type:
1951 if (unloading_occurred) {
1952 // If class unloading occurred we first iterate over all inline caches and
1953 // clear ICs where the cached oop is referring to an unloaded klass or method.
1954 clean_ic_if_metadata_is_dead(CompiledIC_at(&iter), is_alive);
1955 }
1956
1957 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
1958 break;
1959
1960 case relocInfo::opt_virtual_call_type:
1961 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
1962 break;
1963
1964 case relocInfo::static_call_type:
1965 postponed |= clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this);
1966 break;
1967
1968 case relocInfo::oop_type:
1969 if (!is_unloaded) {
1970 is_unloaded = unload_if_dead_at(&iter, is_alive, unloading_occurred);
1971 }
1972 break;
1973
1974 case relocInfo::metadata_type:
1975 break; // nothing to do.
1976 }
1977 }
1978
1979 if (is_unloaded) {
1980 return postponed;
1981 }
1982
1983 // Scopes
1984 for (oop* p = oops_begin(); p < oops_end(); p++) {
1985 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1986 if (can_unload(is_alive, p, unloading_occurred)) {
1987 is_unloaded = true;
1988 break;
1989 }
1990 }
1991
1992 if (is_unloaded) {
1993 return postponed;
1994 }
1995
1996 #if INCLUDE_JVMCI
1997 // Follow JVMCI method
1998 BarrierSet* bs = Universe::heap()->barrier_set();
1999 if (_jvmci_installed_code != NULL) {
2000 if (_jvmci_installed_code->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(_jvmci_installed_code)) {
2001 if (!is_alive->do_object_b(_jvmci_installed_code)) {
2002 clear_jvmci_installed_code();
2003 }
2004 } else {
2005 if (can_unload(is_alive, (oop*)&_jvmci_installed_code, unloading_occurred)) {
2006 is_unloaded = true;
2007 }
2008 }
2009 }
2010
2011 if (_speculation_log != NULL) {
2012 if (!is_alive->do_object_b(_speculation_log)) {
2013 bs->write_ref_nmethod_pre(&_speculation_log, this);
2014 _speculation_log = NULL;
2015 bs->write_ref_nmethod_post(&_speculation_log, this);
2016 }
2017 }
2018 #endif
2019
2020 // Ensure that all metadata is still alive
2021 verify_metadata_loaders(low_boundary, is_alive);
2022
2023 return postponed;
2024 }
2025
2026 void nmethod::do_unloading_parallel_postponed(BoolObjectClosure* is_alive, bool unloading_occurred) {
2027 ResourceMark rm;
2028
2029 // Make sure the oop's ready to receive visitors
2030 assert(!is_zombie(),
2031 "should not call follow on zombie nmethod");
2032
2033 // If the method is not entrant then a JMP is plastered over the
2034 // first few bytes. If an oop in the old code was there, that oop
2035 // should not get GC'd. Skip the first few bytes of oops on
2036 // not-entrant methods.
2037 address low_boundary = verified_entry_point();
2038 if (is_not_entrant()) {
2039 low_boundary += NativeJump::instruction_size;
2040 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
2041 // (See comment above.)
2042 }
2043
2044 RelocIterator iter(this, low_boundary);
2045 while(iter.next()) {
2046
2047 switch (iter.type()) {
2048
2049 case relocInfo::virtual_call_type:
2050 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
2051 break;
2052
2053 case relocInfo::opt_virtual_call_type:
2054 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
2055 break;
2056
2057 case relocInfo::static_call_type:
2058 clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this);
2059 break;
2060 }
2061 }
2062 }
2063
2064 #ifdef ASSERT
2065
2066 class CheckClass : AllStatic {
2067 static BoolObjectClosure* _is_alive;
2068
2069 // Check class_loader is alive for this bit of metadata.
2070 static void check_class(Metadata* md) {
2071 Klass* klass = NULL;
2072 if (md->is_klass()) {
2073 klass = ((Klass*)md);
2074 } else if (md->is_method()) {
2075 klass = ((Method*)md)->method_holder();
2076 } else if (md->is_methodData()) {
2077 klass = ((MethodData*)md)->method()->method_holder();
2078 } else {
2079 md->print();
2080 ShouldNotReachHere();
2081 }
2082 assert(klass->is_loader_alive(_is_alive), "must be alive");
2083 }
2084 public:
2085 static void do_check_class(BoolObjectClosure* is_alive, nmethod* nm) {
2086 assert(SafepointSynchronize::is_at_safepoint(), "this is only ok at safepoint");
2087 _is_alive = is_alive;
2088 nm->metadata_do(check_class);
2089 }
2090 };
2091
2092 // This is called during a safepoint so can use static data
2093 BoolObjectClosure* CheckClass::_is_alive = NULL;
2094 #endif // ASSERT
2095
2096
2097 // Processing of oop references should have been sufficient to keep
2098 // all strong references alive. Any weak references should have been
2099 // cleared as well. Visit all the metadata and ensure that it's
2100 // really alive.
2101 void nmethod::verify_metadata_loaders(address low_boundary, BoolObjectClosure* is_alive) {
2102 #ifdef ASSERT
2103 RelocIterator iter(this, low_boundary);
2104 while (iter.next()) {
2105 // static_stub_Relocations may have dangling references to
2106 // Method*s so trim them out here. Otherwise it looks like
2107 // compiled code is maintaining a link to dead metadata.
2108 address static_call_addr = NULL;
2109 if (iter.type() == relocInfo::opt_virtual_call_type) {
2110 CompiledIC* cic = CompiledIC_at(&iter);
2111 if (!cic->is_call_to_interpreted()) {
2112 static_call_addr = iter.addr();
2113 }
2114 } else if (iter.type() == relocInfo::static_call_type) {
2115 CompiledStaticCall* csc = compiledStaticCall_at(iter.reloc());
2116 if (!csc->is_call_to_interpreted()) {
2117 static_call_addr = iter.addr();
2118 }
2119 }
2120 if (static_call_addr != NULL) {
2121 RelocIterator sciter(this, low_boundary);
2122 while (sciter.next()) {
2123 if (sciter.type() == relocInfo::static_stub_type &&
2124 sciter.static_stub_reloc()->static_call() == static_call_addr) {
2125 sciter.static_stub_reloc()->clear_inline_cache();
2126 }
2127 }
2128 }
2129 }
2130 // Check that the metadata embedded in the nmethod is alive
2131 CheckClass::do_check_class(is_alive, this);
2132 #endif
2133 }
2134
2135
2136 // Iterate over metadata calling this function. Used by RedefineClasses
2137 void nmethod::metadata_do(void f(Metadata*)) {
2138 address low_boundary = verified_entry_point();
2139 if (is_not_entrant()) {
2140 low_boundary += NativeJump::instruction_size;
2141 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
2142 // (See comment above.)
2143 }
2144 {
2145 // Visit all immediate references that are embedded in the instruction stream.
2146 RelocIterator iter(this, low_boundary);
2147 while (iter.next()) {
2148 if (iter.type() == relocInfo::metadata_type ) {
2149 metadata_Relocation* r = iter.metadata_reloc();
2150 // In this metadata, we must only follow those metadatas directly embedded in
2151 // the code. Other metadatas (oop_index>0) are seen as part of
2152 // the metadata section below.
2153 assert(1 == (r->metadata_is_immediate()) +
2154 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
2155 "metadata must be found in exactly one place");
2156 if (r->metadata_is_immediate() && r->metadata_value() != NULL) {
2157 Metadata* md = r->metadata_value();
2158 if (md != _method) f(md);
2159 }
2160 } else if (iter.type() == relocInfo::virtual_call_type) {
2161 // Check compiledIC holders associated with this nmethod
2162 CompiledIC *ic = CompiledIC_at(&iter);
2163 if (ic->is_icholder_call()) {
2164 CompiledICHolder* cichk = ic->cached_icholder();
2165 f(cichk->holder_method());
2166 f(cichk->holder_klass());
2167 } else {
2168 Metadata* ic_oop = ic->cached_metadata();
2169 if (ic_oop != NULL) {
2170 f(ic_oop);
2171 }
2172 }
2173 }
2174 }
2175 }
2176
2177 // Visit the metadata section
2178 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
2179 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops
2180 Metadata* md = *p;
2181 f(md);
2182 }
2183
2184 // Visit metadata not embedded in the other places.
2185 if (_method != NULL) f(_method);
2186 }
2187
2188 void nmethod::oops_do(OopClosure* f, bool allow_zombie) {
2189 // make sure the oops ready to receive visitors
2190 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod");
2191 assert(!is_unloaded(), "should not call follow on unloaded nmethod");
2192
2193 // If the method is not entrant or zombie then a JMP is plastered over the
2194 // first few bytes. If an oop in the old code was there, that oop
2195 // should not get GC'd. Skip the first few bytes of oops on
2196 // not-entrant methods.
2197 address low_boundary = verified_entry_point();
2198 if (is_not_entrant()) {
2199 low_boundary += NativeJump::instruction_size;
2200 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
2201 // (See comment above.)
2202 }
2203
2204 #if INCLUDE_JVMCI
2205 if (_jvmci_installed_code != NULL) {
2206 f->do_oop((oop*) &_jvmci_installed_code);
2207 }
2208 if (_speculation_log != NULL) {
2209 f->do_oop((oop*) &_speculation_log);
2210 }
2211 #endif
2212
2213 RelocIterator iter(this, low_boundary);
2214
2215 while (iter.next()) {
2216 if (iter.type() == relocInfo::oop_type ) {
2217 oop_Relocation* r = iter.oop_reloc();
2218 // In this loop, we must only follow those oops directly embedded in
2219 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
2220 assert(1 == (r->oop_is_immediate()) +
2221 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
2222 "oop must be found in exactly one place");
2223 if (r->oop_is_immediate() && r->oop_value() != NULL) {
2224 f->do_oop(r->oop_addr());
2225 }
2226 }
2227 }
2228
2229 // Scopes
2230 // This includes oop constants not inlined in the code stream.
2231 for (oop* p = oops_begin(); p < oops_end(); p++) {
2232 if (*p == Universe::non_oop_word()) continue; // skip non-oops
2233 f->do_oop(p);
2234 }
2235 }
2236
2237 #define NMETHOD_SENTINEL ((nmethod*)badAddress)
2238
2239 nmethod* volatile nmethod::_oops_do_mark_nmethods;
2240
2241 // An nmethod is "marked" if its _mark_link is set non-null.
2242 // Even if it is the end of the linked list, it will have a non-null link value,
2243 // as long as it is on the list.
2244 // This code must be MP safe, because it is used from parallel GC passes.
2245 bool nmethod::test_set_oops_do_mark() {
2246 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");
2247 nmethod* observed_mark_link = _oops_do_mark_link;
2248 if (observed_mark_link == NULL) {
2249 // Claim this nmethod for this thread to mark.
2250 observed_mark_link = (nmethod*)
2251 Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_link, NULL);
2252 if (observed_mark_link == NULL) {
2253
2254 // Atomically append this nmethod (now claimed) to the head of the list:
2255 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods;
2256 for (;;) {
2257 nmethod* required_mark_nmethods = observed_mark_nmethods;
2258 _oops_do_mark_link = required_mark_nmethods;
2259 observed_mark_nmethods = (nmethod*)
2260 Atomic::cmpxchg_ptr(this, &_oops_do_mark_nmethods, required_mark_nmethods);
2261 if (observed_mark_nmethods == required_mark_nmethods)
2262 break;
2263 }
2264 // Mark was clear when we first saw this guy.
2265 if (TraceScavenge) { print_on(tty, "oops_do, mark"); }
2266 return false;
2267 }
2268 }
2269 // On fall through, another racing thread marked this nmethod before we did.
2270 return true;
2271 }
2272
2273 void nmethod::oops_do_marking_prologue() {
2274 if (TraceScavenge) { tty->print_cr("[oops_do_marking_prologue"); }
2275 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row");
2276 // We use cmpxchg_ptr instead of regular assignment here because the user
2277 // may fork a bunch of threads, and we need them all to see the same state.
2278 void* observed = Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, NULL);
2279 guarantee(observed == NULL, "no races in this sequential code");
2280 }
2281
2282 void nmethod::oops_do_marking_epilogue() {
2283 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row");
2284 nmethod* cur = _oops_do_mark_nmethods;
2285 while (cur != NMETHOD_SENTINEL) {
2286 assert(cur != NULL, "not NULL-terminated");
2287 nmethod* next = cur->_oops_do_mark_link;
2288 cur->_oops_do_mark_link = NULL;
2289 DEBUG_ONLY(cur->verify_oop_relocations());
2290 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark"));
2291 cur = next;
2292 }
2293 void* required = _oops_do_mark_nmethods;
2294 void* observed = Atomic::cmpxchg_ptr(NULL, &_oops_do_mark_nmethods, required);
2295 guarantee(observed == required, "no races in this sequential code");
2296 if (TraceScavenge) { tty->print_cr("oops_do_marking_epilogue]"); }
2297 }
2298
2299 class DetectScavengeRoot: public OopClosure {
2300 bool _detected_scavenge_root;
2301 public:
2302 DetectScavengeRoot() : _detected_scavenge_root(false)
2303 { NOT_PRODUCT(_print_nm = NULL); }
2304 bool detected_scavenge_root() { return _detected_scavenge_root; }
2305 virtual void do_oop(oop* p) {
2306 if ((*p) != NULL && (*p)->is_scavengable()) {
2307 NOT_PRODUCT(maybe_print(p));
2308 _detected_scavenge_root = true;
2309 }
2310 }
2311 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2312
2313 #ifndef PRODUCT
2314 nmethod* _print_nm;
2315 void maybe_print(oop* p) {
2316 if (_print_nm == NULL) return;
2317 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root");
2318 tty->print_cr("" PTR_FORMAT "[offset=%d] detected scavengable oop " PTR_FORMAT " (found at " PTR_FORMAT ")",
2319 p2i(_print_nm), (int)((intptr_t)p - (intptr_t)_print_nm),
2320 p2i(*p), p2i(p));
2321 (*p)->print();
2322 }
2323 #endif //PRODUCT
2324 };
2325
2326 bool nmethod::detect_scavenge_root_oops() {
2327 DetectScavengeRoot detect_scavenge_root;
2328 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this);
2329 oops_do(&detect_scavenge_root);
2330 return detect_scavenge_root.detected_scavenge_root();
2331 }
2332
2333 // Method that knows how to preserve outgoing arguments at call. This method must be
2334 // called with a frame corresponding to a Java invoke
2335 void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) {
2336 #ifndef SHARK
2337 if (method() != NULL && !method()->is_native()) {
2338 address pc = fr.pc();
2339 SimpleScopeDesc ssd(this, pc);
2340 Bytecode_invoke call(ssd.method(), ssd.bci());
2341 bool has_receiver = call.has_receiver();
2342 bool has_appendix = call.has_appendix();
2343 Symbol* signature = call.signature();
2344
2345 // The method attached by JIT-compilers should be used, if present.
2346 // Bytecode can be inaccurate in such case.
2347 Method* callee = attached_method_before_pc(pc);
2348 if (callee != NULL) {
2349 has_receiver = !(callee->access_flags().is_static());
2350 has_appendix = false;
2351 signature = callee->signature();
2352 }
2353
2354 fr.oops_compiled_arguments_do(signature, has_receiver, has_appendix, reg_map, f);
2355 }
2356 #endif // !SHARK
2357 }
2358
2359 inline bool includes(void* p, void* from, void* to) {
2360 return from <= p && p < to;
2361 }
2362
2363
2364 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
2365 assert(count >= 2, "must be sentinel values, at least");
2366
2367 #ifdef ASSERT
2368 // must be sorted and unique; we do a binary search in find_pc_desc()
2369 int prev_offset = pcs[0].pc_offset();
2370 assert(prev_offset == PcDesc::lower_offset_limit,
2371 "must start with a sentinel");
2372 for (int i = 1; i < count; i++) {
2373 int this_offset = pcs[i].pc_offset();
2374 assert(this_offset > prev_offset, "offsets must be sorted");
2375 prev_offset = this_offset;
2376 }
2377 assert(prev_offset == PcDesc::upper_offset_limit,
2378 "must end with a sentinel");
2379 #endif //ASSERT
2380
2381 // Search for MethodHandle invokes and tag the nmethod.
2382 for (int i = 0; i < count; i++) {
2383 if (pcs[i].is_method_handle_invoke()) {
2384 set_has_method_handle_invokes(true);
2385 break;
2386 }
2387 }
2388 assert(has_method_handle_invokes() == (_deoptimize_mh_offset != -1), "must have deopt mh handler");
2389
2390 int size = count * sizeof(PcDesc);
2391 assert(scopes_pcs_size() >= size, "oob");
2392 memcpy(scopes_pcs_begin(), pcs, size);
2393
2394 // Adjust the final sentinel downward.
2395 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
2396 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
2397 last_pc->set_pc_offset(content_size() + 1);
2398 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
2399 // Fill any rounding gaps with copies of the last record.
2400 last_pc[1] = last_pc[0];
2401 }
2402 // The following assert could fail if sizeof(PcDesc) is not
2403 // an integral multiple of oopSize (the rounding term).
2404 // If it fails, change the logic to always allocate a multiple
2405 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
2406 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
2407 }
2408
2409 void nmethod::copy_scopes_data(u_char* buffer, int size) {
2410 assert(scopes_data_size() >= size, "oob");
2411 memcpy(scopes_data_begin(), buffer, size);
2412 }
2413
2414 // When using JVMCI the address might be off by the size of a call instruction.
2415 bool nmethod::is_deopt_entry(address pc) {
2416 return pc == deopt_handler_begin()
2417 #if INCLUDE_JVMCI
2418 || pc == (deopt_handler_begin() + NativeCall::instruction_size)
2419 #endif
2420 ;
2421 }
2422
2423 #ifdef ASSERT
2424 static PcDesc* linear_search(nmethod* nm, int pc_offset, bool approximate) {
2425 PcDesc* lower = nm->scopes_pcs_begin();
2426 PcDesc* upper = nm->scopes_pcs_end();
2427 lower += 1; // exclude initial sentinel
2428 PcDesc* res = NULL;
2429 for (PcDesc* p = lower; p < upper; p++) {
2430 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc
2431 if (match_desc(p, pc_offset, approximate)) {
2432 if (res == NULL)
2433 res = p;
2434 else
2435 res = (PcDesc*) badAddress;
2436 }
2437 }
2438 return res;
2439 }
2440 #endif
2441
2442
2443 // Finds a PcDesc with real-pc equal to "pc"
2444 PcDesc* nmethod::find_pc_desc_internal(address pc, bool approximate) {
2445 address base_address = code_begin();
2446 if ((pc < base_address) ||
2447 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
2448 return NULL; // PC is wildly out of range
2449 }
2450 int pc_offset = (int) (pc - base_address);
2451
2452 // Check the PcDesc cache if it contains the desired PcDesc
2453 // (This as an almost 100% hit rate.)
2454 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
2455 if (res != NULL) {
2456 assert(res == linear_search(this, pc_offset, approximate), "cache ok");
2457 return res;
2458 }
2459
2460 // Fallback algorithm: quasi-linear search for the PcDesc
2461 // Find the last pc_offset less than the given offset.
2462 // The successor must be the required match, if there is a match at all.
2463 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
2464 PcDesc* lower = scopes_pcs_begin();
2465 PcDesc* upper = scopes_pcs_end();
2466 upper -= 1; // exclude final sentinel
2467 if (lower >= upper) return NULL; // native method; no PcDescs at all
2468
2469 #define assert_LU_OK \
2470 /* invariant on lower..upper during the following search: */ \
2471 assert(lower->pc_offset() < pc_offset, "sanity"); \
2472 assert(upper->pc_offset() >= pc_offset, "sanity")
2473 assert_LU_OK;
2474
2475 // Use the last successful return as a split point.
2476 PcDesc* mid = _pc_desc_cache.last_pc_desc();
2477 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
2478 if (mid->pc_offset() < pc_offset) {
2479 lower = mid;
2480 } else {
2481 upper = mid;
2482 }
2483
2484 // Take giant steps at first (4096, then 256, then 16, then 1)
2485 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
2486 const int RADIX = (1 << LOG2_RADIX);
2487 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
2488 while ((mid = lower + step) < upper) {
2489 assert_LU_OK;
2490 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
2491 if (mid->pc_offset() < pc_offset) {
2492 lower = mid;
2493 } else {
2494 upper = mid;
2495 break;
2496 }
2497 }
2498 assert_LU_OK;
2499 }
2500
2501 // Sneak up on the value with a linear search of length ~16.
2502 while (true) {
2503 assert_LU_OK;
2504 mid = lower + 1;
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 break;
2511 }
2512 }
2513 #undef assert_LU_OK
2514
2515 if (match_desc(upper, pc_offset, approximate)) {
2516 assert(upper == linear_search(this, pc_offset, approximate), "search ok");
2517 _pc_desc_cache.add_pc_desc(upper);
2518 return upper;
2519 } else {
2520 assert(NULL == linear_search(this, pc_offset, approximate), "search ok");
2521 return NULL;
2522 }
2523 }
2524
2525
2526 void nmethod::check_all_dependencies(DepChange& changes) {
2527 // Checked dependencies are allocated into this ResourceMark
2528 ResourceMark rm;
2529
2530 // Turn off dependency tracing while actually testing dependencies.
2531 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) );
2532
2533 typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash,
2534 &DependencySignature::equals, 11027> DepTable;
2535
2536 DepTable* table = new DepTable();
2537
2538 // Iterate over live nmethods and check dependencies of all nmethods that are not
2539 // marked for deoptimization. A particular dependency is only checked once.
2540 NMethodIterator iter;
2541 while(iter.next()) {
2542 nmethod* nm = iter.method();
2543 // Only notify for live nmethods
2544 if (nm->is_alive() && !nm->is_marked_for_deoptimization()) {
2545 for (Dependencies::DepStream deps(nm); deps.next(); ) {
2546 // Construct abstraction of a dependency.
2547 DependencySignature* current_sig = new DependencySignature(deps);
2548
2549 // Determine if dependency is already checked. table->put(...) returns
2550 // 'true' if the dependency is added (i.e., was not in the hashtable).
2551 if (table->put(*current_sig, 1)) {
2552 if (deps.check_dependency() != NULL) {
2553 // Dependency checking failed. Print out information about the failed
2554 // dependency and finally fail with an assert. We can fail here, since
2555 // dependency checking is never done in a product build.
2556 tty->print_cr("Failed dependency:");
2557 changes.print();
2558 nm->print();
2559 nm->print_dependencies();
2560 assert(false, "Should have been marked for deoptimization");
2561 }
2562 }
2563 }
2564 }
2565 }
2566 }
2567
2568 bool nmethod::check_dependency_on(DepChange& changes) {
2569 // What has happened:
2570 // 1) a new class dependee has been added
2571 // 2) dependee and all its super classes have been marked
2572 bool found_check = false; // set true if we are upset
2573 for (Dependencies::DepStream deps(this); deps.next(); ) {
2574 // Evaluate only relevant dependencies.
2575 if (deps.spot_check_dependency_at(changes) != NULL) {
2576 found_check = true;
2577 NOT_DEBUG(break);
2578 }
2579 }
2580 return found_check;
2581 }
2582
2583 bool nmethod::is_evol_dependent_on(Klass* dependee) {
2584 InstanceKlass *dependee_ik = InstanceKlass::cast(dependee);
2585 Array<Method*>* dependee_methods = dependee_ik->methods();
2586 for (Dependencies::DepStream deps(this); deps.next(); ) {
2587 if (deps.type() == Dependencies::evol_method) {
2588 Method* method = deps.method_argument(0);
2589 for (int j = 0; j < dependee_methods->length(); j++) {
2590 if (dependee_methods->at(j) == method) {
2591 // RC_TRACE macro has an embedded ResourceMark
2592 RC_TRACE(0x01000000,
2593 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)",
2594 _method->method_holder()->external_name(),
2595 _method->name()->as_C_string(),
2596 _method->signature()->as_C_string(), compile_id(),
2597 method->method_holder()->external_name(),
2598 method->name()->as_C_string(),
2599 method->signature()->as_C_string()));
2600 if (TraceDependencies || LogCompilation)
2601 deps.log_dependency(dependee);
2602 return true;
2603 }
2604 }
2605 }
2606 }
2607 return false;
2608 }
2609
2610 // Called from mark_for_deoptimization, when dependee is invalidated.
2611 bool nmethod::is_dependent_on_method(Method* dependee) {
2612 for (Dependencies::DepStream deps(this); deps.next(); ) {
2613 if (deps.type() != Dependencies::evol_method)
2614 continue;
2615 Method* method = deps.method_argument(0);
2616 if (method == dependee) return true;
2617 }
2618 return false;
2619 }
2620
2621
2622 bool nmethod::is_patchable_at(address instr_addr) {
2623 assert(insts_contains(instr_addr), "wrong nmethod used");
2624 if (is_zombie()) {
2625 // a zombie may never be patched
2626 return false;
2627 }
2628 return true;
2629 }
2630
2631
2632 address nmethod::continuation_for_implicit_exception(address pc) {
2633 // Exception happened outside inline-cache check code => we are inside
2634 // an active nmethod => use cpc to determine a return address
2635 int exception_offset = pc - code_begin();
2636 int cont_offset = ImplicitExceptionTable(this).at( exception_offset );
2637 #ifdef ASSERT
2638 if (cont_offset == 0) {
2639 Thread* thread = Thread::current();
2640 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
2641 HandleMark hm(thread);
2642 ResourceMark rm(thread);
2643 CodeBlob* cb = CodeCache::find_blob(pc);
2644 assert(cb != NULL && cb == this, "");
2645 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, p2i(pc));
2646 print();
2647 method()->print_codes();
2648 print_code();
2649 print_pcs();
2650 }
2651 #endif
2652 if (cont_offset == 0) {
2653 // Let the normal error handling report the exception
2654 return NULL;
2655 }
2656 return code_begin() + cont_offset;
2657 }
2658
2659
2660
2661 void nmethod_init() {
2662 // make sure you didn't forget to adjust the filler fields
2663 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
2664 }
2665
2666
2667 //-------------------------------------------------------------------------------------------
2668
2669
2670 // QQQ might we make this work from a frame??
2671 nmethodLocker::nmethodLocker(address pc) {
2672 CodeBlob* cb = CodeCache::find_blob(pc);
2673 guarantee(cb != NULL && cb->is_nmethod(), "bad pc for a nmethod found");
2674 _nm = (nmethod*)cb;
2675 lock_nmethod(_nm);
2676 }
2677
2678 // Only JvmtiDeferredEvent::compiled_method_unload_event()
2679 // should pass zombie_ok == true.
2680 void nmethodLocker::lock_nmethod(nmethod* nm, bool zombie_ok) {
2681 if (nm == NULL) return;
2682 Atomic::inc(&nm->_lock_count);
2683 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method");
2684 }
2685
2686 void nmethodLocker::unlock_nmethod(nmethod* nm) {
2687 if (nm == NULL) return;
2688 Atomic::dec(&nm->_lock_count);
2689 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock");
2690 }
2691
2692 // -----------------------------------------------------------------------------
2693 // nmethod::get_deopt_original_pc
2694 //
2695 // Return the original PC for the given PC if:
2696 // (a) the given PC belongs to a nmethod and
2697 // (b) it is a deopt PC
2698 address nmethod::get_deopt_original_pc(const frame* fr) {
2699 if (fr->cb() == NULL) return NULL;
2700
2701 nmethod* nm = fr->cb()->as_nmethod_or_null();
2702 if (nm != NULL && nm->is_deopt_pc(fr->pc()))
2703 return nm->get_original_pc(fr);
2704
2705 return NULL;
2706 }
2707
2708
2709 // -----------------------------------------------------------------------------
2710 // MethodHandle
2711
2712 bool nmethod::is_method_handle_return(address return_pc) {
2713 if (!has_method_handle_invokes()) return false;
2714 PcDesc* pd = pc_desc_at(return_pc);
2715 if (pd == NULL)
2716 return false;
2717 return pd->is_method_handle_invoke();
2718 }
2719
2720
2721 // -----------------------------------------------------------------------------
2722 // Verification
2723
2724 class VerifyOopsClosure: public OopClosure {
2725 nmethod* _nm;
2726 bool _ok;
2727 public:
2728 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
2729 bool ok() { return _ok; }
2730 virtual void do_oop(oop* p) {
2731 if ((*p) == NULL || (*p)->is_oop()) return;
2732 if (_ok) {
2733 _nm->print_nmethod(true);
2734 _ok = false;
2735 }
2736 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2737 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2738 }
2739 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2740 };
2741
2742 void nmethod::verify() {
2743
2744 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant
2745 // seems odd.
2746
2747 if (is_zombie() || is_not_entrant() || is_unloaded())
2748 return;
2749
2750 // Make sure all the entry points are correctly aligned for patching.
2751 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
2752
2753 // assert(method()->is_oop(), "must be valid");
2754
2755 ResourceMark rm;
2756
2757 if (!CodeCache::contains(this)) {
2758 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this));
2759 }
2760
2761 if(is_native_method() )
2762 return;
2763
2764 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
2765 if (nm != this) {
2766 fatal("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this));
2767 }
2768
2769 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2770 if (! p->verify(this)) {
2771 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this));
2772 }
2773 }
2774
2775 VerifyOopsClosure voc(this);
2776 oops_do(&voc);
2777 assert(voc.ok(), "embedded oops must be OK");
2778 verify_scavenge_root_oops();
2779
2780 verify_scopes();
2781 }
2782
2783
2784 void nmethod::verify_interrupt_point(address call_site) {
2785 // Verify IC only when nmethod installation is finished.
2786 bool is_installed = (method()->code() == this) // nmethod is in state 'in_use' and installed
2787 || !this->is_in_use(); // nmethod is installed, but not in 'in_use' state
2788 if (is_installed) {
2789 Thread *cur = Thread::current();
2790 if (CompiledIC_lock->owner() == cur ||
2791 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) &&
2792 SafepointSynchronize::is_at_safepoint())) {
2793 CompiledIC_at(this, call_site);
2794 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
2795 } else {
2796 MutexLocker ml_verify (CompiledIC_lock);
2797 CompiledIC_at(this, call_site);
2798 }
2799 }
2800
2801 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address());
2802 assert(pd != NULL, "PcDesc must exist");
2803 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(),
2804 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(),
2805 pd->return_oop());
2806 !sd->is_top(); sd = sd->sender()) {
2807 sd->verify();
2808 }
2809 }
2810
2811 void nmethod::verify_scopes() {
2812 if( !method() ) return; // Runtime stubs have no scope
2813 if (method()->is_native()) return; // Ignore stub methods.
2814 // iterate through all interrupt point
2815 // and verify the debug information is valid.
2816 RelocIterator iter((nmethod*)this);
2817 while (iter.next()) {
2818 address stub = NULL;
2819 switch (iter.type()) {
2820 case relocInfo::virtual_call_type:
2821 verify_interrupt_point(iter.addr());
2822 break;
2823 case relocInfo::opt_virtual_call_type:
2824 stub = iter.opt_virtual_call_reloc()->static_stub();
2825 verify_interrupt_point(iter.addr());
2826 break;
2827 case relocInfo::static_call_type:
2828 stub = iter.static_call_reloc()->static_stub();
2829 //verify_interrupt_point(iter.addr());
2830 break;
2831 case relocInfo::runtime_call_type:
2832 address destination = iter.reloc()->value();
2833 // Right now there is no way to find out which entries support
2834 // an interrupt point. It would be nice if we had this
2835 // information in a table.
2836 break;
2837 }
2838 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section");
2839 }
2840 }
2841
2842
2843 // -----------------------------------------------------------------------------
2844 // Non-product code
2845 #ifndef PRODUCT
2846
2847 class DebugScavengeRoot: public OopClosure {
2848 nmethod* _nm;
2849 bool _ok;
2850 public:
2851 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { }
2852 bool ok() { return _ok; }
2853 virtual void do_oop(oop* p) {
2854 if ((*p) == NULL || !(*p)->is_scavengable()) return;
2855 if (_ok) {
2856 _nm->print_nmethod(true);
2857 _ok = false;
2858 }
2859 tty->print_cr("*** scavengable oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2860 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2861 (*p)->print();
2862 }
2863 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2864 };
2865
2866 void nmethod::verify_scavenge_root_oops() {
2867 if (UseG1GC) {
2868 return;
2869 }
2870
2871 if (!on_scavenge_root_list()) {
2872 // Actually look inside, to verify the claim that it's clean.
2873 DebugScavengeRoot debug_scavenge_root(this);
2874 oops_do(&debug_scavenge_root);
2875 if (!debug_scavenge_root.ok())
2876 fatal("found an unadvertised bad scavengable oop in the code cache");
2877 }
2878 assert(scavenge_root_not_marked(), "");
2879 }
2880
2881 #endif // PRODUCT
2882
2883 // Printing operations
2884
2885 void nmethod::print() const {
2886 ResourceMark rm;
2887 ttyLocker ttyl; // keep the following output all in one block
2888
2889 tty->print("Compiled method ");
2890
2891 if (is_compiled_by_c1()) {
2892 tty->print("(c1) ");
2893 } else if (is_compiled_by_c2()) {
2894 tty->print("(c2) ");
2895 } else if (is_compiled_by_shark()) {
2896 tty->print("(shark) ");
2897 } else if (is_compiled_by_jvmci()) {
2898 tty->print("(JVMCI) ");
2899 } else {
2900 tty->print("(nm) ");
2901 }
2902
2903 print_on(tty, NULL);
2904
2905 if (WizardMode) {
2906 tty->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this));
2907 tty->print(" for method " INTPTR_FORMAT , p2i(method()));
2908 tty->print(" { ");
2909 if (is_in_use()) tty->print("in_use ");
2910 if (is_not_entrant()) tty->print("not_entrant ");
2911 if (is_zombie()) tty->print("zombie ");
2912 if (is_unloaded()) tty->print("unloaded ");
2913 if (on_scavenge_root_list()) tty->print("scavenge_root ");
2914 tty->print_cr("}:");
2915 }
2916 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2917 p2i(this),
2918 p2i(this) + size(),
2919 size());
2920 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2921 p2i(relocation_begin()),
2922 p2i(relocation_end()),
2923 relocation_size());
2924 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2925 p2i(consts_begin()),
2926 p2i(consts_end()),
2927 consts_size());
2928 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2929 p2i(insts_begin()),
2930 p2i(insts_end()),
2931 insts_size());
2932 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2933 p2i(stub_begin()),
2934 p2i(stub_end()),
2935 stub_size());
2936 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2937 p2i(oops_begin()),
2938 p2i(oops_end()),
2939 oops_size());
2940 if (metadata_size () > 0) tty->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2941 p2i(metadata_begin()),
2942 p2i(metadata_end()),
2943 metadata_size());
2944 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2945 p2i(scopes_data_begin()),
2946 p2i(scopes_data_end()),
2947 scopes_data_size());
2948 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2949 p2i(scopes_pcs_begin()),
2950 p2i(scopes_pcs_end()),
2951 scopes_pcs_size());
2952 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2953 p2i(dependencies_begin()),
2954 p2i(dependencies_end()),
2955 dependencies_size());
2956 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2957 p2i(handler_table_begin()),
2958 p2i(handler_table_end()),
2959 handler_table_size());
2960 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2961 p2i(nul_chk_table_begin()),
2962 p2i(nul_chk_table_end()),
2963 nul_chk_table_size());
2964 }
2965
2966 void nmethod::print_code() {
2967 HandleMark hm;
2968 ResourceMark m;
2969 Disassembler::decode(this);
2970 }
2971
2972
2973 #ifndef PRODUCT
2974
2975 void nmethod::print_scopes() {
2976 // Find the first pc desc for all scopes in the code and print it.
2977 ResourceMark rm;
2978 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2979 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
2980 continue;
2981
2982 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
2983 while (sd != NULL) {
2984 sd->print_on(tty, p);
2985 sd = sd->sender();
2986 }
2987 }
2988 }
2989
2990 void nmethod::print_dependencies() {
2991 ResourceMark rm;
2992 ttyLocker ttyl; // keep the following output all in one block
2993 tty->print_cr("Dependencies:");
2994 for (Dependencies::DepStream deps(this); deps.next(); ) {
2995 deps.print_dependency();
2996 Klass* ctxk = deps.context_type();
2997 if (ctxk != NULL) {
2998 if (ctxk->is_instance_klass() && InstanceKlass::cast(ctxk)->is_dependent_nmethod(this)) {
2999 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name());
3000 }
3001 }
3002 deps.log_dependency(); // put it into the xml log also
3003 }
3004 }
3005
3006
3007 void nmethod::print_relocations() {
3008 ResourceMark m; // in case methods get printed via the debugger
3009 tty->print_cr("relocations:");
3010 RelocIterator iter(this);
3011 iter.print();
3012 if (UseRelocIndex) {
3013 jint* index_end = (jint*)relocation_end() - 1;
3014 jint index_size = *index_end;
3015 jint* index_start = (jint*)( (address)index_end - index_size );
3016 tty->print_cr(" index @" INTPTR_FORMAT ": index_size=%d", p2i(index_start), index_size);
3017 if (index_size > 0) {
3018 jint* ip;
3019 for (ip = index_start; ip+2 <= index_end; ip += 2)
3020 tty->print_cr(" (%d %d) addr=" INTPTR_FORMAT " @" INTPTR_FORMAT,
3021 ip[0],
3022 ip[1],
3023 p2i(header_end()+ip[0]),
3024 p2i(relocation_begin()-1+ip[1]));
3025 for (; ip < index_end; ip++)
3026 tty->print_cr(" (%d ?)", ip[0]);
3027 tty->print_cr(" @" INTPTR_FORMAT ": index_size=%d", p2i(ip), *ip);
3028 ip++;
3029 tty->print_cr("reloc_end @" INTPTR_FORMAT ":", p2i(ip));
3030 }
3031 }
3032 }
3033
3034
3035 void nmethod::print_pcs() {
3036 ResourceMark m; // in case methods get printed via debugger
3037 tty->print_cr("pc-bytecode offsets:");
3038 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
3039 p->print(this);
3040 }
3041 }
3042
3043 void nmethod::print_recorded_oops() {
3044 tty->print_cr("Recorded oops:");
3045 for (int i = 0; i < oops_count(); i++) {
3046 oop o = oop_at(i);
3047 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(o));
3048 if (o == (oop)Universe::non_oop_word()) {
3049 tty->print("non-oop word");
3050 } else {
3051 o->print_value();
3052 }
3053 tty->cr();
3054 }
3055 }
3056
3057 void nmethod::print_recorded_metadata() {
3058 tty->print_cr("Recorded metadata:");
3059 for (int i = 0; i < metadata_count(); i++) {
3060 Metadata* m = metadata_at(i);
3061 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(m));
3062 if (m == (Metadata*)Universe::non_oop_word()) {
3063 tty->print("non-metadata word");
3064 } else {
3065 m->print_value_on_maybe_null(tty);
3066 }
3067 tty->cr();
3068 }
3069 }
3070
3071 #endif // PRODUCT
3072
3073 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
3074 RelocIterator iter(this, begin, end);
3075 bool have_one = false;
3076 while (iter.next()) {
3077 have_one = true;
3078 switch (iter.type()) {
3079 case relocInfo::none: return "no_reloc";
3080 case relocInfo::oop_type: {
3081 stringStream st;
3082 oop_Relocation* r = iter.oop_reloc();
3083 oop obj = r->oop_value();
3084 st.print("oop(");
3085 if (obj == NULL) st.print("NULL");
3086 else obj->print_value_on(&st);
3087 st.print(")");
3088 return st.as_string();
3089 }
3090 case relocInfo::metadata_type: {
3091 stringStream st;
3092 metadata_Relocation* r = iter.metadata_reloc();
3093 Metadata* obj = r->metadata_value();
3094 st.print("metadata(");
3095 if (obj == NULL) st.print("NULL");
3096 else obj->print_value_on(&st);
3097 st.print(")");
3098 return st.as_string();
3099 }
3100 case relocInfo::runtime_call_type: {
3101 stringStream st;
3102 st.print("runtime_call");
3103 runtime_call_Relocation* r = iter.runtime_call_reloc();
3104 address dest = r->destination();
3105 CodeBlob* cb = CodeCache::find_blob(dest);
3106 if (cb != NULL) {
3107 st.print(" %s", cb->name());
3108 } else {
3109 ResourceMark rm;
3110 const int buflen = 1024;
3111 char* buf = NEW_RESOURCE_ARRAY(char, buflen);
3112 int offset;
3113 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) {
3114 st.print(" %s", buf);
3115 if (offset != 0) {
3116 st.print("+%d", offset);
3117 }
3118 }
3119 }
3120 return st.as_string();
3121 }
3122 case relocInfo::virtual_call_type: {
3123 stringStream st;
3124 st.print_raw("virtual_call");
3125 virtual_call_Relocation* r = iter.virtual_call_reloc();
3126 Method* m = r->method_value();
3127 if (m != NULL) {
3128 assert(m->is_method(), "");
3129 m->print_short_name(&st);
3130 }
3131 return st.as_string();
3132 }
3133 case relocInfo::opt_virtual_call_type: {
3134 stringStream st;
3135 st.print_raw("optimized virtual_call");
3136 opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc();
3137 Method* m = r->method_value();
3138 if (m != NULL) {
3139 assert(m->is_method(), "");
3140 m->print_short_name(&st);
3141 }
3142 return st.as_string();
3143 }
3144 case relocInfo::static_call_type: {
3145 stringStream st;
3146 st.print_raw("static_call");
3147 static_call_Relocation* r = iter.static_call_reloc();
3148 Method* m = r->method_value();
3149 if (m != NULL) {
3150 assert(m->is_method(), "");
3151 m->print_short_name(&st);
3152 }
3153 return st.as_string();
3154 }
3155 case relocInfo::static_stub_type: return "static_stub";
3156 case relocInfo::external_word_type: return "external_word";
3157 case relocInfo::internal_word_type: return "internal_word";
3158 case relocInfo::section_word_type: return "section_word";
3159 case relocInfo::poll_type: return "poll";
3160 case relocInfo::poll_return_type: return "poll_return";
3161 case relocInfo::type_mask: return "type_bit_mask";
3162 }
3163 }
3164 return have_one ? "other" : NULL;
3165 }
3166
3167 // Return a the last scope in (begin..end]
3168 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
3169 PcDesc* p = pc_desc_near(begin+1);
3170 if (p != NULL && p->real_pc(this) <= end) {
3171 return new ScopeDesc(this, p->scope_decode_offset(),
3172 p->obj_decode_offset(), p->should_reexecute(), p->rethrow_exception(),
3173 p->return_oop());
3174 }
3175 return NULL;
3176 }
3177
3178 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const {
3179 if (block_begin == entry_point()) stream->print_cr("[Entry Point]");
3180 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]");
3181 if (JVMCI_ONLY(_exception_offset >= 0 &&) block_begin == exception_begin()) stream->print_cr("[Exception Handler]");
3182 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]");
3183 if (JVMCI_ONLY(_deoptimize_offset >= 0 &&) block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]");
3184
3185 if (has_method_handle_invokes())
3186 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]");
3187
3188 if (block_begin == consts_begin()) stream->print_cr("[Constants]");
3189
3190 if (block_begin == entry_point()) {
3191 methodHandle m = method();
3192 if (m.not_null()) {
3193 stream->print(" # ");
3194 m->print_value_on(stream);
3195 stream->cr();
3196 }
3197 if (m.not_null() && !is_osr_method()) {
3198 ResourceMark rm;
3199 int sizeargs = m->size_of_parameters();
3200 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
3201 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
3202 {
3203 int sig_index = 0;
3204 if (!m->is_static())
3205 sig_bt[sig_index++] = T_OBJECT; // 'this'
3206 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) {
3207 BasicType t = ss.type();
3208 sig_bt[sig_index++] = t;
3209 if (type2size[t] == 2) {
3210 sig_bt[sig_index++] = T_VOID;
3211 } else {
3212 assert(type2size[t] == 1, "size is 1 or 2");
3213 }
3214 }
3215 assert(sig_index == sizeargs, "");
3216 }
3217 const char* spname = "sp"; // make arch-specific?
3218 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false);
3219 int stack_slot_offset = this->frame_size() * wordSize;
3220 int tab1 = 14, tab2 = 24;
3221 int sig_index = 0;
3222 int arg_index = (m->is_static() ? 0 : -1);
3223 bool did_old_sp = false;
3224 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) {
3225 bool at_this = (arg_index == -1);
3226 bool at_old_sp = false;
3227 BasicType t = (at_this ? T_OBJECT : ss.type());
3228 assert(t == sig_bt[sig_index], "sigs in sync");
3229 if (at_this)
3230 stream->print(" # this: ");
3231 else
3232 stream->print(" # parm%d: ", arg_index);
3233 stream->move_to(tab1);
3234 VMReg fst = regs[sig_index].first();
3235 VMReg snd = regs[sig_index].second();
3236 if (fst->is_reg()) {
3237 stream->print("%s", fst->name());
3238 if (snd->is_valid()) {
3239 stream->print(":%s", snd->name());
3240 }
3241 } else if (fst->is_stack()) {
3242 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
3243 if (offset == stack_slot_offset) at_old_sp = true;
3244 stream->print("[%s+0x%x]", spname, offset);
3245 } else {
3246 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
3247 }
3248 stream->print(" ");
3249 stream->move_to(tab2);
3250 stream->print("= ");
3251 if (at_this) {
3252 m->method_holder()->print_value_on(stream);
3253 } else {
3254 bool did_name = false;
3255 if (!at_this && ss.is_object()) {
3256 Symbol* name = ss.as_symbol_or_null();
3257 if (name != NULL) {
3258 name->print_value_on(stream);
3259 did_name = true;
3260 }
3261 }
3262 if (!did_name)
3263 stream->print("%s", type2name(t));
3264 }
3265 if (at_old_sp) {
3266 stream->print(" (%s of caller)", spname);
3267 did_old_sp = true;
3268 }
3269 stream->cr();
3270 sig_index += type2size[t];
3271 arg_index += 1;
3272 if (!at_this) ss.next();
3273 }
3274 if (!did_old_sp) {
3275 stream->print(" # ");
3276 stream->move_to(tab1);
3277 stream->print("[%s+0x%x]", spname, stack_slot_offset);
3278 stream->print(" (%s of caller)", spname);
3279 stream->cr();
3280 }
3281 }
3282 }
3283 }
3284
3285 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) {
3286 // First, find an oopmap in (begin, end].
3287 // We use the odd half-closed interval so that oop maps and scope descs
3288 // which are tied to the byte after a call are printed with the call itself.
3289 address base = code_begin();
3290 ImmutableOopMapSet* oms = oop_maps();
3291 if (oms != NULL) {
3292 for (int i = 0, imax = oms->count(); i < imax; i++) {
3293 const ImmutableOopMapPair* pair = oms->pair_at(i);
3294 const ImmutableOopMap* om = pair->get_from(oms);
3295 address pc = base + pair->pc_offset();
3296 if (pc > begin) {
3297 if (pc <= end) {
3298 st->move_to(column);
3299 st->print("; ");
3300 om->print_on(st);
3301 }
3302 break;
3303 }
3304 }
3305 }
3306
3307 // Print any debug info present at this pc.
3308 ScopeDesc* sd = scope_desc_in(begin, end);
3309 if (sd != NULL) {
3310 st->move_to(column);
3311 if (sd->bci() == SynchronizationEntryBCI) {
3312 st->print(";*synchronization entry");
3313 } else {
3314 if (sd->method() == NULL) {
3315 st->print("method is NULL");
3316 } else if (sd->method()->is_native()) {
3317 st->print("method is native");
3318 } else {
3319 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci());
3320 st->print(";*%s", Bytecodes::name(bc));
3321 switch (bc) {
3322 case Bytecodes::_invokevirtual:
3323 case Bytecodes::_invokespecial:
3324 case Bytecodes::_invokestatic:
3325 case Bytecodes::_invokeinterface:
3326 {
3327 Bytecode_invoke invoke(sd->method(), sd->bci());
3328 st->print(" ");
3329 if (invoke.name() != NULL)
3330 invoke.name()->print_symbol_on(st);
3331 else
3332 st->print("<UNKNOWN>");
3333 break;
3334 }
3335 case Bytecodes::_getfield:
3336 case Bytecodes::_putfield:
3337 case Bytecodes::_getstatic:
3338 case Bytecodes::_putstatic:
3339 {
3340 Bytecode_field field(sd->method(), sd->bci());
3341 st->print(" ");
3342 if (field.name() != NULL)
3343 field.name()->print_symbol_on(st);
3344 else
3345 st->print("<UNKNOWN>");
3346 }
3347 }
3348 }
3349 st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop());
3350 }
3351
3352 // Print all scopes
3353 for (;sd != NULL; sd = sd->sender()) {
3354 st->move_to(column);
3355 st->print("; -");
3356 if (sd->method() == NULL) {
3357 st->print("method is NULL");
3358 } else {
3359 sd->method()->print_short_name(st);
3360 }
3361 int lineno = sd->method()->line_number_from_bci(sd->bci());
3362 if (lineno != -1) {
3363 st->print("@%d (line %d)", sd->bci(), lineno);
3364 } else {
3365 st->print("@%d", sd->bci());
3366 }
3367 st->cr();
3368 }
3369 }
3370
3371 // Print relocation information
3372 const char* str = reloc_string_for(begin, end);
3373 if (str != NULL) {
3374 if (sd != NULL) st->cr();
3375 st->move_to(column);
3376 st->print("; {%s}", str);
3377 }
3378 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin());
3379 if (cont_offset != 0) {
3380 st->move_to(column);
3381 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset));
3382 }
3383
3384 }
3385
3386 #ifndef PRODUCT
3387
3388 void nmethod::print_value_on(outputStream* st) const {
3389 st->print("nmethod");
3390 print_on(st, NULL);
3391 }
3392
3393 void nmethod::print_calls(outputStream* st) {
3394 RelocIterator iter(this);
3395 while (iter.next()) {
3396 switch (iter.type()) {
3397 case relocInfo::virtual_call_type:
3398 case relocInfo::opt_virtual_call_type: {
3399 VerifyMutexLocker mc(CompiledIC_lock);
3400 CompiledIC_at(&iter)->print();
3401 break;
3402 }
3403 case relocInfo::static_call_type:
3404 st->print_cr("Static call at " INTPTR_FORMAT, p2i(iter.reloc()->addr()));
3405 compiledStaticCall_at(iter.reloc())->print();
3406 break;
3407 }
3408 }
3409 }
3410
3411 void nmethod::print_handler_table() {
3412 ExceptionHandlerTable(this).print();
3413 }
3414
3415 void nmethod::print_nul_chk_table() {
3416 ImplicitExceptionTable(this).print(code_begin());
3417 }
3418
3419 void nmethod::print_statistics() {
3420 ttyLocker ttyl;
3421 if (xtty != NULL) xtty->head("statistics type='nmethod'");
3422 native_nmethod_stats.print_native_nmethod_stats();
3423 #ifdef COMPILER1
3424 c1_java_nmethod_stats.print_nmethod_stats("C1");
3425 #endif
3426 #ifdef COMPILER2
3427 c2_java_nmethod_stats.print_nmethod_stats("C2");
3428 #endif
3429 #if INCLUDE_JVMCI
3430 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI");
3431 #endif
3432 #ifdef SHARK
3433 shark_java_nmethod_stats.print_nmethod_stats("Shark");
3434 #endif
3435 unknown_java_nmethod_stats.print_nmethod_stats("Unknown");
3436 DebugInformationRecorder::print_statistics();
3437 #ifndef PRODUCT
3438 pc_nmethod_stats.print_pc_stats();
3439 #endif
3440 Dependencies::print_statistics();
3441 if (xtty != NULL) xtty->tail("statistics");
3442 }
3443
3444 #endif // !PRODUCT
3445
3446 #if INCLUDE_JVMCI
3447 void nmethod::clear_jvmci_installed_code() {
3448 // write_ref_method_pre/post can only be safely called at a
3449 // safepoint or while holding the CodeCache_lock
3450 assert(CodeCache_lock->is_locked() ||
3451 SafepointSynchronize::is_at_safepoint(), "should be performed under a lock for consistency");
3452 if (_jvmci_installed_code != NULL) {
3453 // This must be done carefully to maintain nmethod remembered sets properly
3454 BarrierSet* bs = Universe::heap()->barrier_set();
3455 bs->write_ref_nmethod_pre(&_jvmci_installed_code, this);
3456 _jvmci_installed_code = NULL;
3457 bs->write_ref_nmethod_post(&_jvmci_installed_code, this);
3458 }
3459 }
3460
3461 void nmethod::maybe_invalidate_installed_code() {
3462 assert(Patching_lock->is_locked() ||
3463 SafepointSynchronize::is_at_safepoint(), "should be performed under a lock for consistency");
3464 oop installed_code = jvmci_installed_code();
3465 if (installed_code != NULL) {
3466 nmethod* nm = (nmethod*)InstalledCode::address(installed_code);
3467 if (nm == NULL || nm != this) {
3468 // The link has been broken or the InstalledCode instance is
3469 // associated with another nmethod so do nothing.
3470 return;
3471 }
3472 if (!is_alive()) {
3473 // Break the link between nmethod and InstalledCode such that the nmethod
3474 // can subsequently be flushed safely. The link must be maintained while
3475 // the method could have live activations since invalidateInstalledCode
3476 // might want to invalidate all existing activations.
3477 InstalledCode::set_address(installed_code, 0);
3478 InstalledCode::set_entryPoint(installed_code, 0);
3479 } else if (is_not_entrant()) {
3480 // Remove the entry point so any invocation will fail but keep
3481 // the address link around that so that existing activations can
3482 // be invalidated.
3483 InstalledCode::set_entryPoint(installed_code, 0);
3484 }
3485 }
3486 }
3487
3488 void nmethod::invalidate_installed_code(Handle installedCode, TRAPS) {
3489 if (installedCode() == NULL) {
3490 THROW(vmSymbols::java_lang_NullPointerException());
3491 }
3492 jlong nativeMethod = InstalledCode::address(installedCode);
3493 nmethod* nm = (nmethod*)nativeMethod;
3494 if (nm == NULL) {
3495 // Nothing to do
3496 return;
3497 }
3498
3499 nmethodLocker nml(nm);
3500 #ifdef ASSERT
3501 {
3502 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
3503 // This relationship can only be checked safely under a lock
3504 assert(nm == NULL || !nm->is_alive() || nm->jvmci_installed_code() == installedCode(), "sanity check");
3505 }
3506 #endif
3507
3508 if (nm->is_alive()) {
3509 // The nmethod state machinery maintains the link between the
3510 // HotSpotInstalledCode and nmethod* so as long as the nmethod appears to be
3511 // alive assume there is work to do and deoptimize the nmethod.
3512 nm->mark_for_deoptimization();
3513 VM_Deoptimize op;
3514 VMThread::execute(&op);
3515 }
3516
3517 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
3518 // Check that it's still associated with the same nmethod and break
3519 // the link if it is.
3520 if (InstalledCode::address(installedCode) == nativeMethod) {
3521 InstalledCode::set_address(installedCode, 0);
3522 }
3523 }
3524
3525 char* nmethod::jvmci_installed_code_name(char* buf, size_t buflen) {
3526 if (!this->is_compiled_by_jvmci()) {
3527 return NULL;
3528 }
3529 oop installedCode = this->jvmci_installed_code();
3530 if (installedCode != NULL) {
3531 oop installedCodeName = NULL;
3532 if (installedCode->is_a(InstalledCode::klass())) {
3533 installedCodeName = InstalledCode::name(installedCode);
3534 }
3535 if (installedCodeName != NULL) {
3536 return java_lang_String::as_utf8_string(installedCodeName, buf, (int)buflen);
3537 } else {
3538 jio_snprintf(buf, buflen, "null");
3539 return buf;
3540 }
3541 }
3542 jio_snprintf(buf, buflen, "noInstalledCode");
3543 return buf;
3544 }
3545 #endif
3546
3547 Method* nmethod::attached_method(address call_instr) {
3548 assert(code_contains(call_instr), "not part of the nmethod");
3549 RelocIterator iter(this, call_instr, call_instr + 1);
3550 while (iter.next()) {
3551 if (iter.addr() == call_instr) {
3552 switch(iter.type()) {
3553 case relocInfo::static_call_type: return iter.static_call_reloc()->method_value();
3554 case relocInfo::opt_virtual_call_type: return iter.opt_virtual_call_reloc()->method_value();
3555 case relocInfo::virtual_call_type: return iter.virtual_call_reloc()->method_value();
3556 }
3557 }
3558 }
3559 return NULL; // not found
3560 }
3561
3562 Method* nmethod::attached_method_before_pc(address pc) {
3563 if (NativeCall::is_call_before(pc)) {
3564 NativeCall* ncall = nativeCall_before(pc);
3565 return attached_method(ncall->instruction_address());
3566 }
3567 return NULL; // not a call
3568 }
3569