1 /*
2 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "code/codeCache.hpp"
27 #include "code/compiledIC.hpp"
28 #include "code/dependencies.hpp"
29 #include "code/nativeInst.hpp"
30 #include "code/nmethod.hpp"
31 #include "code/scopeDesc.hpp"
32 #include "compiler/abstractCompiler.hpp"
33 #include "compiler/compileBroker.hpp"
34 #include "compiler/compileLog.hpp"
35 #include "compiler/compilerDirectives.hpp"
36 #include "compiler/directivesParser.hpp"
37 #include "compiler/disassembler.hpp"
38 #include "interpreter/bytecode.hpp"
39 #include "oops/methodData.hpp"
40 #include "oops/oop.inline.hpp"
41 #include "prims/jvmtiRedefineClassesTrace.hpp"
42 #include "prims/jvmtiImpl.hpp"
43 #include "runtime/atomic.inline.hpp"
44 #include "runtime/orderAccess.inline.hpp"
45 #include "runtime/os.hpp"
46 #include "runtime/sharedRuntime.hpp"
47 #include "runtime/sweeper.hpp"
48 #include "utilities/resourceHash.hpp"
49 #include "utilities/dtrace.hpp"
50 #include "utilities/events.hpp"
51 #include "utilities/xmlstream.hpp"
52 #include "logging/log.hpp"
53 #ifdef TARGET_ARCH_x86
54 # include "nativeInst_x86.hpp"
55 #endif
56 #ifdef TARGET_ARCH_sparc
57 # include "nativeInst_sparc.hpp"
58 #endif
59 #ifdef TARGET_ARCH_zero
60 # include "nativeInst_zero.hpp"
61 #endif
62 #ifdef TARGET_ARCH_arm
63 # include "nativeInst_arm.hpp"
64 #endif
65 #ifdef TARGET_ARCH_ppc
66 # include "nativeInst_ppc.hpp"
67 #endif
68 #ifdef SHARK
69 #include "shark/sharkCompiler.hpp"
70 #endif
71 #if INCLUDE_JVMCI
72 #include "jvmci/jvmciJavaClasses.hpp"
73 #endif
74
75 unsigned char nmethod::_global_unloading_clock = 0;
76
77 #ifdef DTRACE_ENABLED
78
79 // Only bother with this argument setup if dtrace is available
80
81 #define DTRACE_METHOD_UNLOAD_PROBE(method) \
82 { \
83 Method* m = (method); \
84 if (m != NULL) { \
85 Symbol* klass_name = m->klass_name(); \
86 Symbol* name = m->name(); \
87 Symbol* signature = m->signature(); \
88 HOTSPOT_COMPILED_METHOD_UNLOAD( \
89 (char *) klass_name->bytes(), klass_name->utf8_length(), \
90 (char *) name->bytes(), name->utf8_length(), \
91 (char *) signature->bytes(), signature->utf8_length()); \
92 } \
93 }
94
95 #else // ndef DTRACE_ENABLED
96
97 #define DTRACE_METHOD_UNLOAD_PROBE(method)
98
99 #endif
100
101 bool nmethod::is_compiled_by_c1() const {
102 if (compiler() == NULL) {
103 return false;
104 }
105 return compiler()->is_c1();
106 }
107 bool nmethod::is_compiled_by_jvmci() const {
108 if (compiler() == NULL || method() == NULL) return false; // can happen during debug printing
109 if (is_native_method()) return false;
110 return compiler()->is_jvmci();
111 }
112 bool nmethod::is_compiled_by_c2() const {
113 if (compiler() == NULL) {
114 return false;
115 }
116 return compiler()->is_c2();
117 }
118 bool nmethod::is_compiled_by_shark() const {
119 if (compiler() == NULL) {
120 return false;
121 }
122 return compiler()->is_shark();
123 }
124
125
126
127 //---------------------------------------------------------------------------------
128 // NMethod statistics
129 // They are printed under various flags, including:
130 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation.
131 // (In the latter two cases, they like other stats are printed to the log only.)
132
133 #ifndef PRODUCT
134 // These variables are put into one block to reduce relocations
135 // and make it simpler to print from the debugger.
136 struct java_nmethod_stats_struct {
137 int nmethod_count;
138 int total_size;
139 int relocation_size;
140 int consts_size;
141 int insts_size;
142 int stub_size;
143 int scopes_data_size;
144 int scopes_pcs_size;
145 int dependencies_size;
146 int handler_table_size;
147 int nul_chk_table_size;
148 int oops_size;
149 int metadata_size;
150
151 void note_nmethod(nmethod* nm) {
152 nmethod_count += 1;
153 total_size += nm->size();
154 relocation_size += nm->relocation_size();
155 consts_size += nm->consts_size();
156 insts_size += nm->insts_size();
157 stub_size += nm->stub_size();
158 oops_size += nm->oops_size();
159 metadata_size += nm->metadata_size();
160 scopes_data_size += nm->scopes_data_size();
161 scopes_pcs_size += nm->scopes_pcs_size();
162 dependencies_size += nm->dependencies_size();
163 handler_table_size += nm->handler_table_size();
164 nul_chk_table_size += nm->nul_chk_table_size();
165 }
166 void print_nmethod_stats(const char* name) {
167 if (nmethod_count == 0) return;
168 tty->print_cr("Statistics for %d bytecoded nmethods for %s:", nmethod_count, name);
169 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size);
170 if (nmethod_count != 0) tty->print_cr(" header = " SIZE_FORMAT, nmethod_count * sizeof(nmethod));
171 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size);
172 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size);
173 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size);
174 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size);
175 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size);
176 if (metadata_size != 0) tty->print_cr(" metadata = %d", metadata_size);
177 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size);
178 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size);
179 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size);
180 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size);
181 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size);
182 }
183 };
184
185 struct native_nmethod_stats_struct {
186 int native_nmethod_count;
187 int native_total_size;
188 int native_relocation_size;
189 int native_insts_size;
190 int native_oops_size;
191 int native_metadata_size;
192 void note_native_nmethod(nmethod* nm) {
193 native_nmethod_count += 1;
194 native_total_size += nm->size();
195 native_relocation_size += nm->relocation_size();
196 native_insts_size += nm->insts_size();
197 native_oops_size += nm->oops_size();
198 native_metadata_size += nm->metadata_size();
199 }
200 void print_native_nmethod_stats() {
201 if (native_nmethod_count == 0) return;
202 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count);
203 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size);
204 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size);
205 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size);
206 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size);
207 if (native_metadata_size != 0) tty->print_cr(" N. metadata = %d", native_metadata_size);
208 }
209 };
210
211 struct pc_nmethod_stats_struct {
212 int pc_desc_resets; // number of resets (= number of caches)
213 int pc_desc_queries; // queries to nmethod::find_pc_desc
214 int pc_desc_approx; // number of those which have approximate true
215 int pc_desc_repeats; // number of _pc_descs[0] hits
216 int pc_desc_hits; // number of LRU cache hits
217 int pc_desc_tests; // total number of PcDesc examinations
218 int pc_desc_searches; // total number of quasi-binary search steps
219 int pc_desc_adds; // number of LUR cache insertions
220
221 void print_pc_stats() {
222 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query",
223 pc_desc_queries,
224 (double)(pc_desc_tests + pc_desc_searches)
225 / pc_desc_queries);
226 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d",
227 pc_desc_resets,
228 pc_desc_queries, pc_desc_approx,
229 pc_desc_repeats, pc_desc_hits,
230 pc_desc_tests, pc_desc_searches, pc_desc_adds);
231 }
232 };
233
234 #ifdef COMPILER1
235 static java_nmethod_stats_struct c1_java_nmethod_stats;
236 #endif
237 #ifdef COMPILER2
238 static java_nmethod_stats_struct c2_java_nmethod_stats;
239 #endif
240 #if INCLUDE_JVMCI
241 static java_nmethod_stats_struct jvmci_java_nmethod_stats;
242 #endif
243 #ifdef SHARK
244 static java_nmethod_stats_struct shark_java_nmethod_stats;
245 #endif
246 static java_nmethod_stats_struct unknown_java_nmethod_stats;
247
248 static native_nmethod_stats_struct native_nmethod_stats;
249 static pc_nmethod_stats_struct pc_nmethod_stats;
250
251 static void note_java_nmethod(nmethod* nm) {
252 #ifdef COMPILER1
253 if (nm->is_compiled_by_c1()) {
254 c1_java_nmethod_stats.note_nmethod(nm);
255 } else
256 #endif
257 #ifdef COMPILER2
258 if (nm->is_compiled_by_c2()) {
259 c2_java_nmethod_stats.note_nmethod(nm);
260 } else
261 #endif
262 #if INCLUDE_JVMCI
263 if (nm->is_compiled_by_jvmci()) {
264 jvmci_java_nmethod_stats.note_nmethod(nm);
265 } else
266 #endif
267 #ifdef SHARK
268 if (nm->is_compiled_by_shark()) {
269 shark_java_nmethod_stats.note_nmethod(nm);
270 } else
271 #endif
272 {
273 unknown_java_nmethod_stats.note_nmethod(nm);
274 }
275 }
276 #endif // !PRODUCT
277
278 //---------------------------------------------------------------------------------
279
280
281 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) {
282 assert(pc != NULL, "Must be non null");
283 assert(exception.not_null(), "Must be non null");
284 assert(handler != NULL, "Must be non null");
285
286 _count = 0;
287 _exception_type = exception->klass();
288 _next = NULL;
289
290 add_address_and_handler(pc,handler);
291 }
292
293
294 address ExceptionCache::match(Handle exception, address pc) {
295 assert(pc != NULL,"Must be non null");
296 assert(exception.not_null(),"Must be non null");
297 if (exception->klass() == exception_type()) {
298 return (test_address(pc));
299 }
300
301 return NULL;
302 }
303
304
305 bool ExceptionCache::match_exception_with_space(Handle exception) {
306 assert(exception.not_null(),"Must be non null");
307 if (exception->klass() == exception_type() && count() < cache_size) {
308 return true;
309 }
310 return false;
311 }
312
313
314 address ExceptionCache::test_address(address addr) {
315 for (int i=0; i<count(); i++) {
316 if (pc_at(i) == addr) {
317 return handler_at(i);
318 }
319 }
320 return NULL;
321 }
322
323
324 bool ExceptionCache::add_address_and_handler(address addr, address handler) {
325 if (test_address(addr) == handler) return true;
326
327 int index = count();
328 if (index < cache_size) {
329 set_pc_at(index, addr);
330 set_handler_at(index, handler);
331 OrderAccess::storestore();
332 increment_count();
333 return true;
334 }
335 return false;
336 }
337
338
339 // private method for handling exception cache
340 // These methods are private, and used to manipulate the exception cache
341 // directly.
342 ExceptionCache* nmethod::exception_cache_entry_for_exception(Handle exception) {
343 ExceptionCache* ec = exception_cache();
344 while (ec != NULL) {
345 if (ec->match_exception_with_space(exception)) {
346 return ec;
347 }
348 ec = ec->next();
349 }
350 return NULL;
351 }
352
353
354 //-----------------------------------------------------------------------------
355
356
357 // Helper used by both find_pc_desc methods.
358 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) {
359 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_tests);
360 if (!approximate)
361 return pc->pc_offset() == pc_offset;
362 else
363 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset();
364 }
365
366 void PcDescCache::reset_to(PcDesc* initial_pc_desc) {
367 if (initial_pc_desc == NULL) {
368 _pc_descs[0] = NULL; // native method; no PcDescs at all
369 return;
370 }
371 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_resets);
372 // reset the cache by filling it with benign (non-null) values
373 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel");
374 for (int i = 0; i < cache_size; i++)
375 _pc_descs[i] = initial_pc_desc;
376 }
377
378 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) {
379 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_queries);
380 NOT_PRODUCT(if (approximate) ++pc_nmethod_stats.pc_desc_approx);
381
382 // Note: one might think that caching the most recently
383 // read value separately would be a win, but one would be
384 // wrong. When many threads are updating it, the cache
385 // line it's in would bounce between caches, negating
386 // any benefit.
387
388 // In order to prevent race conditions do not load cache elements
389 // repeatedly, but use a local copy:
390 PcDesc* res;
391
392 // Step one: Check the most recently added value.
393 res = _pc_descs[0];
394 if (res == NULL) return NULL; // native method; no PcDescs at all
395 if (match_desc(res, pc_offset, approximate)) {
396 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_repeats);
397 return res;
398 }
399
400 // Step two: Check the rest of the LRU cache.
401 for (int i = 1; i < cache_size; ++i) {
402 res = _pc_descs[i];
403 if (res->pc_offset() < 0) break; // optimization: skip empty cache
404 if (match_desc(res, pc_offset, approximate)) {
405 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_hits);
406 return res;
407 }
408 }
409
410 // Report failure.
411 return NULL;
412 }
413
414 void PcDescCache::add_pc_desc(PcDesc* pc_desc) {
415 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_adds);
416 // Update the LRU cache by shifting pc_desc forward.
417 for (int i = 0; i < cache_size; i++) {
418 PcDesc* next = _pc_descs[i];
419 _pc_descs[i] = pc_desc;
420 pc_desc = next;
421 }
422 }
423
424 // adjust pcs_size so that it is a multiple of both oopSize and
425 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple
426 // of oopSize, then 2*sizeof(PcDesc) is)
427 static int adjust_pcs_size(int pcs_size) {
428 int nsize = round_to(pcs_size, oopSize);
429 if ((nsize % sizeof(PcDesc)) != 0) {
430 nsize = pcs_size + sizeof(PcDesc);
431 }
432 assert((nsize % oopSize) == 0, "correct alignment");
433 return nsize;
434 }
435
436 //-----------------------------------------------------------------------------
437
438
439 void nmethod::add_exception_cache_entry(ExceptionCache* new_entry) {
440 assert(ExceptionCache_lock->owned_by_self(),"Must hold the ExceptionCache_lock");
441 assert(new_entry != NULL,"Must be non null");
442 assert(new_entry->next() == NULL, "Must be null");
443
444 if (exception_cache() != NULL) {
445 new_entry->set_next(exception_cache());
446 }
447 set_exception_cache(new_entry);
448 }
449
450 void nmethod::clean_exception_cache(BoolObjectClosure* is_alive) {
451 ExceptionCache* prev = NULL;
452 ExceptionCache* curr = exception_cache();
453
454 while (curr != NULL) {
455 ExceptionCache* next = curr->next();
456
457 Klass* ex_klass = curr->exception_type();
458 if (ex_klass != NULL && !ex_klass->is_loader_alive(is_alive)) {
459 if (prev == NULL) {
460 set_exception_cache(next);
461 } else {
462 prev->set_next(next);
463 }
464 delete curr;
465 // prev stays the same.
466 } else {
467 prev = curr;
468 }
469
470 curr = next;
471 }
472 }
473
474 // public method for accessing the exception cache
475 // These are the public access methods.
476 address nmethod::handler_for_exception_and_pc(Handle exception, address pc) {
477 // We never grab a lock to read the exception cache, so we may
478 // have false negatives. This is okay, as it can only happen during
479 // the first few exception lookups for a given nmethod.
480 ExceptionCache* ec = exception_cache();
481 while (ec != NULL) {
482 address ret_val;
483 if ((ret_val = ec->match(exception,pc)) != NULL) {
484 return ret_val;
485 }
486 ec = ec->next();
487 }
488 return NULL;
489 }
490
491
492 void nmethod::add_handler_for_exception_and_pc(Handle exception, address pc, address handler) {
493 // There are potential race conditions during exception cache updates, so we
494 // must own the ExceptionCache_lock before doing ANY modifications. Because
495 // we don't lock during reads, it is possible to have several threads attempt
496 // to update the cache with the same data. We need to check for already inserted
497 // copies of the current data before adding it.
498
499 MutexLocker ml(ExceptionCache_lock);
500 ExceptionCache* target_entry = exception_cache_entry_for_exception(exception);
501
502 if (target_entry == NULL || !target_entry->add_address_and_handler(pc,handler)) {
503 target_entry = new ExceptionCache(exception,pc,handler);
504 add_exception_cache_entry(target_entry);
505 }
506 }
507
508
509 //-------------end of code for ExceptionCache--------------
510
511
512 int nmethod::total_size() const {
513 return
514 consts_size() +
515 insts_size() +
516 stub_size() +
517 scopes_data_size() +
518 scopes_pcs_size() +
519 handler_table_size() +
520 nul_chk_table_size();
521 }
522
523 const char* nmethod::compile_kind() const {
524 if (is_osr_method()) return "osr";
525 if (method() != NULL && is_native_method()) return "c2n";
526 return NULL;
527 }
528
529 // Fill in default values for various flag fields
530 void nmethod::init_defaults() {
531 _state = in_use;
532 _unloading_clock = 0;
533 _has_flushed_dependencies = 0;
534 _has_unsafe_access = 0;
535 _has_method_handle_invokes = 0;
536 _lazy_critical_native = 0;
537 _has_wide_vectors = 0;
538 _mark_for_deoptimization_status = not_marked;
539 _lock_count = 0;
540 _stack_traversal_mark = 0;
541 _unload_reported = false; // jvmti state
542
543 #ifdef ASSERT
544 _oops_are_stale = false;
545 #endif
546
547 _oops_do_mark_link = NULL;
548 _jmethod_id = NULL;
549 _osr_link = NULL;
550 if (UseG1GC) {
551 _unloading_next = NULL;
552 } else {
553 _scavenge_root_link = NULL;
554 }
555 _scavenge_root_state = 0;
556 _compiler = NULL;
557 #if INCLUDE_RTM_OPT
558 _rtm_state = NoRTM;
559 #endif
560 #if INCLUDE_JVMCI
561 _jvmci_installed_code = NULL;
562 _speculation_log = NULL;
563 #endif
564 }
565
566 nmethod* nmethod::new_native_nmethod(const methodHandle& method,
567 int compile_id,
568 CodeBuffer *code_buffer,
569 int vep_offset,
570 int frame_complete,
571 int frame_size,
572 ByteSize basic_lock_owner_sp_offset,
573 ByteSize basic_lock_sp_offset,
574 OopMapSet* oop_maps) {
575 code_buffer->finalize_oop_references(method);
576 // create nmethod
577 nmethod* nm = NULL;
578 {
579 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
580 int native_nmethod_size = allocation_size(code_buffer, sizeof(nmethod));
581 CodeOffsets offsets;
582 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
583 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
584 nm = new (native_nmethod_size, CompLevel_none) nmethod(method(), native_nmethod_size,
585 compile_id, &offsets,
586 code_buffer, frame_size,
587 basic_lock_owner_sp_offset,
588 basic_lock_sp_offset, oop_maps);
589 NOT_PRODUCT(if (nm != NULL) native_nmethod_stats.note_native_nmethod(nm));
590 }
591 // verify nmethod
592 debug_only(if (nm) nm->verify();) // might block
593
594 if (nm != NULL) {
595 nm->log_new_nmethod();
596 }
597
598 return nm;
599 }
600
601 nmethod* nmethod::new_nmethod(const methodHandle& method,
602 int compile_id,
603 int entry_bci,
604 CodeOffsets* offsets,
605 int orig_pc_offset,
606 DebugInformationRecorder* debug_info,
607 Dependencies* dependencies,
608 CodeBuffer* code_buffer, int frame_size,
609 OopMapSet* oop_maps,
610 ExceptionHandlerTable* handler_table,
611 ImplicitExceptionTable* nul_chk_table,
612 AbstractCompiler* compiler,
613 int comp_level
614 #if INCLUDE_JVMCI
615 , Handle installed_code,
616 Handle speculationLog
617 #endif
618 )
619 {
620 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
621 code_buffer->finalize_oop_references(method);
622 // create nmethod
623 nmethod* nm = NULL;
624 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
625 int nmethod_size =
626 allocation_size(code_buffer, sizeof(nmethod))
627 + adjust_pcs_size(debug_info->pcs_size())
628 + round_to(dependencies->size_in_bytes() , oopSize)
629 + round_to(handler_table->size_in_bytes(), oopSize)
630 + round_to(nul_chk_table->size_in_bytes(), oopSize)
631 + round_to(debug_info->data_size() , oopSize);
632
633 nm = new (nmethod_size, comp_level)
634 nmethod(method(), nmethod_size, compile_id, entry_bci, offsets,
635 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size,
636 oop_maps,
637 handler_table,
638 nul_chk_table,
639 compiler,
640 comp_level
641 #if INCLUDE_JVMCI
642 , installed_code,
643 speculationLog
644 #endif
645 );
646
647 if (nm != NULL) {
648 // To make dependency checking during class loading fast, record
649 // the nmethod dependencies in the classes it is dependent on.
650 // This allows the dependency checking code to simply walk the
651 // class hierarchy above the loaded class, checking only nmethods
652 // which are dependent on those classes. The slow way is to
653 // check every nmethod for dependencies which makes it linear in
654 // the number of methods compiled. For applications with a lot
655 // classes the slow way is too slow.
656 for (Dependencies::DepStream deps(nm); deps.next(); ) {
657 if (deps.type() == Dependencies::call_site_target_value) {
658 // CallSite dependencies are managed on per-CallSite instance basis.
659 oop call_site = deps.argument_oop(0);
660 MethodHandles::add_dependent_nmethod(call_site, nm);
661 } else {
662 Klass* klass = deps.context_type();
663 if (klass == NULL) {
664 continue; // ignore things like evol_method
665 }
666 // record this nmethod as dependent on this klass
667 InstanceKlass::cast(klass)->add_dependent_nmethod(nm);
668 }
669 }
670 NOT_PRODUCT(if (nm != NULL) note_java_nmethod(nm));
671 }
672 }
673 // Do verification and logging outside CodeCache_lock.
674 if (nm != NULL) {
675 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
676 DEBUG_ONLY(nm->verify();)
677 nm->log_new_nmethod();
678 }
679 return nm;
680 }
681
682 // For native wrappers
683 nmethod::nmethod(
684 Method* method,
685 int nmethod_size,
686 int compile_id,
687 CodeOffsets* offsets,
688 CodeBuffer* code_buffer,
689 int frame_size,
690 ByteSize basic_lock_owner_sp_offset,
691 ByteSize basic_lock_sp_offset,
692 OopMapSet* oop_maps )
693 : CodeBlob("native nmethod", code_buffer, sizeof(nmethod),
694 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps),
695 _native_receiver_sp_offset(basic_lock_owner_sp_offset),
696 _native_basic_lock_sp_offset(basic_lock_sp_offset)
697 {
698 {
699 debug_only(NoSafepointVerifier nsv;)
700 assert_locked_or_safepoint(CodeCache_lock);
701
702 init_defaults();
703 _method = method;
704 _entry_bci = InvocationEntryBci;
705 // We have no exception handler or deopt handler make the
706 // values something that will never match a pc like the nmethod vtable entry
707 _exception_offset = 0;
708 _deoptimize_offset = 0;
709 _deoptimize_mh_offset = 0;
710 _orig_pc_offset = 0;
711
712 _consts_offset = data_offset();
713 _stub_offset = data_offset();
714 _oops_offset = data_offset();
715 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize);
716 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize);
717 _scopes_pcs_offset = _scopes_data_offset;
718 _dependencies_offset = _scopes_pcs_offset;
719 _handler_table_offset = _dependencies_offset;
720 _nul_chk_table_offset = _handler_table_offset;
721 _nmethod_end_offset = _nul_chk_table_offset;
722 _compile_id = compile_id;
723 _comp_level = CompLevel_none;
724 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
725 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
726 _osr_entry_point = NULL;
727 _exception_cache = NULL;
728 _pc_desc_cache.reset_to(NULL);
729 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
730
731 code_buffer->copy_values_to(this);
732 if (ScavengeRootsInCode) {
733 if (detect_scavenge_root_oops()) {
734 CodeCache::add_scavenge_root_nmethod(this);
735 }
736 Universe::heap()->register_nmethod(this);
737 }
738 debug_only(verify_scavenge_root_oops());
739 CodeCache::commit(this);
740 }
741
742 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
743 ttyLocker ttyl; // keep the following output all in one block
744 // This output goes directly to the tty, not the compiler log.
745 // To enable tools to match it up with the compilation activity,
746 // be sure to tag this tty output with the compile ID.
747 if (xtty != NULL) {
748 xtty->begin_head("print_native_nmethod");
749 xtty->method(_method);
750 xtty->stamp();
751 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
752 }
753 // print the header part first
754 print();
755 // then print the requested information
756 if (PrintNativeNMethods) {
757 print_code();
758 if (oop_maps != NULL) {
759 oop_maps->print();
760 }
761 }
762 if (PrintRelocations) {
763 print_relocations();
764 }
765 if (xtty != NULL) {
766 xtty->tail("print_native_nmethod");
767 }
768 }
769 }
770
771 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () {
772 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level));
773 }
774
775 nmethod::nmethod(
776 Method* method,
777 int nmethod_size,
778 int compile_id,
779 int entry_bci,
780 CodeOffsets* offsets,
781 int orig_pc_offset,
782 DebugInformationRecorder* debug_info,
783 Dependencies* dependencies,
784 CodeBuffer *code_buffer,
785 int frame_size,
786 OopMapSet* oop_maps,
787 ExceptionHandlerTable* handler_table,
788 ImplicitExceptionTable* nul_chk_table,
789 AbstractCompiler* compiler,
790 int comp_level
791 #if INCLUDE_JVMCI
792 , Handle installed_code,
793 Handle speculation_log
794 #endif
795 )
796 : CodeBlob("nmethod", code_buffer, sizeof(nmethod),
797 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps),
798 _native_receiver_sp_offset(in_ByteSize(-1)),
799 _native_basic_lock_sp_offset(in_ByteSize(-1))
800 {
801 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
802 {
803 debug_only(NoSafepointVerifier nsv;)
804 assert_locked_or_safepoint(CodeCache_lock);
805
806 init_defaults();
807 _method = method;
808 _entry_bci = entry_bci;
809 _compile_id = compile_id;
810 _comp_level = comp_level;
811 _compiler = compiler;
812 _orig_pc_offset = orig_pc_offset;
813 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
814
815 // Section offsets
816 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts());
817 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs());
818
819 #if INCLUDE_JVMCI
820 _jvmci_installed_code = installed_code();
821 _speculation_log = (instanceOop)speculation_log();
822
823 if (compiler->is_jvmci()) {
824 // JVMCI might not produce any stub sections
825 if (offsets->value(CodeOffsets::Exceptions) != -1) {
826 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions);
827 } else {
828 _exception_offset = -1;
829 }
830 if (offsets->value(CodeOffsets::Deopt) != -1) {
831 _deoptimize_offset = code_offset() + offsets->value(CodeOffsets::Deopt);
832 } else {
833 _deoptimize_offset = -1;
834 }
835 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
836 _deoptimize_mh_offset = code_offset() + offsets->value(CodeOffsets::DeoptMH);
837 } else {
838 _deoptimize_mh_offset = -1;
839 }
840 } else {
841 #endif
842 // Exception handler and deopt handler are in the stub section
843 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set");
844 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set");
845
846 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
847 _deoptimize_offset = _stub_offset + offsets->value(CodeOffsets::Deopt);
848 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
849 _deoptimize_mh_offset = _stub_offset + offsets->value(CodeOffsets::DeoptMH);
850 } else {
851 _deoptimize_mh_offset = -1;
852 #if INCLUDE_JVMCI
853 }
854 #endif
855 }
856 if (offsets->value(CodeOffsets::UnwindHandler) != -1) {
857 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler);
858 } else {
859 _unwind_handler_offset = -1;
860 }
861
862 _oops_offset = data_offset();
863 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize);
864 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize);
865
866 _scopes_pcs_offset = _scopes_data_offset + round_to(debug_info->data_size (), oopSize);
867 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
868 _handler_table_offset = _dependencies_offset + round_to(dependencies->size_in_bytes (), oopSize);
869 _nul_chk_table_offset = _handler_table_offset + round_to(handler_table->size_in_bytes(), oopSize);
870 _nmethod_end_offset = _nul_chk_table_offset + round_to(nul_chk_table->size_in_bytes(), oopSize);
871
872 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
873 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
874 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry);
875 _exception_cache = NULL;
876 _pc_desc_cache.reset_to(scopes_pcs_begin());
877
878 // Copy contents of ScopeDescRecorder to nmethod
879 code_buffer->copy_values_to(this);
880 debug_info->copy_to(this);
881 dependencies->copy_to(this);
882 if (ScavengeRootsInCode) {
883 if (detect_scavenge_root_oops()) {
884 CodeCache::add_scavenge_root_nmethod(this);
885 }
886 Universe::heap()->register_nmethod(this);
887 }
888 debug_only(verify_scavenge_root_oops());
889
890 CodeCache::commit(this);
891
892 // Copy contents of ExceptionHandlerTable to nmethod
893 handler_table->copy_to(this);
894 nul_chk_table->copy_to(this);
895
896 // we use the information of entry points to find out if a method is
897 // static or non static
898 assert(compiler->is_c2() || compiler->is_jvmci() ||
899 _method->is_static() == (entry_point() == _verified_entry_point),
900 " entry points must be same for static methods and vice versa");
901 }
902 }
903
904 // Print a short set of xml attributes to identify this nmethod. The
905 // output should be embedded in some other element.
906 void nmethod::log_identity(xmlStream* log) const {
907 log->print(" compile_id='%d'", compile_id());
908 const char* nm_kind = compile_kind();
909 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind);
910 if (compiler() != NULL) {
911 log->print(" compiler='%s'", compiler()->name());
912 }
913 if (TieredCompilation) {
914 log->print(" level='%d'", comp_level());
915 }
916 }
917
918
919 #define LOG_OFFSET(log, name) \
920 if (p2i(name##_end()) - p2i(name##_begin())) \
921 log->print(" " XSTR(name) "_offset='" INTX_FORMAT "'" , \
922 p2i(name##_begin()) - p2i(this))
923
924
925 void nmethod::log_new_nmethod() const {
926 if (LogCompilation && xtty != NULL) {
927 ttyLocker ttyl;
928 HandleMark hm;
929 xtty->begin_elem("nmethod");
930 log_identity(xtty);
931 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size());
932 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this));
933
934 LOG_OFFSET(xtty, relocation);
935 LOG_OFFSET(xtty, consts);
936 LOG_OFFSET(xtty, insts);
937 LOG_OFFSET(xtty, stub);
938 LOG_OFFSET(xtty, scopes_data);
939 LOG_OFFSET(xtty, scopes_pcs);
940 LOG_OFFSET(xtty, dependencies);
941 LOG_OFFSET(xtty, handler_table);
942 LOG_OFFSET(xtty, nul_chk_table);
943 LOG_OFFSET(xtty, oops);
944 LOG_OFFSET(xtty, metadata);
945
946 xtty->method(method());
947 xtty->stamp();
948 xtty->end_elem();
949 }
950 }
951
952 #undef LOG_OFFSET
953
954
955 // Print out more verbose output usually for a newly created nmethod.
956 void nmethod::print_on(outputStream* st, const char* msg) const {
957 if (st != NULL) {
958 ttyLocker ttyl;
959 if (WizardMode) {
960 CompileTask::print(st, this, msg, /*short_form:*/ true);
961 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this));
962 } else {
963 CompileTask::print(st, this, msg, /*short_form:*/ false);
964 }
965 }
966 }
967
968 void nmethod::maybe_print_nmethod(DirectiveSet* directive) {
969 bool printnmethods = directive->PrintAssemblyOption || directive->PrintNMethodsOption;
970 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
971 print_nmethod(printnmethods);
972 }
973 }
974
975 void nmethod::print_nmethod(bool printmethod) {
976 ttyLocker ttyl; // keep the following output all in one block
977 if (xtty != NULL) {
978 xtty->begin_head("print_nmethod");
979 xtty->stamp();
980 xtty->end_head();
981 }
982 // print the header part first
983 print();
984 // then print the requested information
985 if (printmethod) {
986 print_code();
987 print_pcs();
988 if (oop_maps()) {
989 oop_maps()->print();
990 }
991 }
992 if (printmethod || PrintDebugInfo || CompilerOracle::has_option_string(_method, "PrintDebugInfo")) {
993 print_scopes();
994 }
995 if (printmethod || PrintRelocations || CompilerOracle::has_option_string(_method, "PrintRelocations")) {
996 print_relocations();
997 }
998 if (printmethod || PrintDependencies || CompilerOracle::has_option_string(_method, "PrintDependencies")) {
999 print_dependencies();
1000 }
1001 if (printmethod || PrintExceptionHandlers) {
1002 print_handler_table();
1003 print_nul_chk_table();
1004 }
1005 if (printmethod) {
1006 print_recorded_oops();
1007 print_recorded_metadata();
1008 }
1009 if (xtty != NULL) {
1010 xtty->tail("print_nmethod");
1011 }
1012 }
1013
1014
1015 // Promote one word from an assembly-time handle to a live embedded oop.
1016 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
1017 if (handle == NULL ||
1018 // As a special case, IC oops are initialized to 1 or -1.
1019 handle == (jobject) Universe::non_oop_word()) {
1020 (*dest) = (oop) handle;
1021 } else {
1022 (*dest) = JNIHandles::resolve_non_null(handle);
1023 }
1024 }
1025
1026
1027 // Have to have the same name because it's called by a template
1028 void nmethod::copy_values(GrowableArray<jobject>* array) {
1029 int length = array->length();
1030 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
1031 oop* dest = oops_begin();
1032 for (int index = 0 ; index < length; index++) {
1033 initialize_immediate_oop(&dest[index], array->at(index));
1034 }
1035
1036 // Now we can fix up all the oops in the code. We need to do this
1037 // in the code because the assembler uses jobjects as placeholders.
1038 // The code and relocations have already been initialized by the
1039 // CodeBlob constructor, so it is valid even at this early point to
1040 // iterate over relocations and patch the code.
1041 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true);
1042 }
1043
1044 void nmethod::copy_values(GrowableArray<Metadata*>* array) {
1045 int length = array->length();
1046 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough");
1047 Metadata** dest = metadata_begin();
1048 for (int index = 0 ; index < length; index++) {
1049 dest[index] = array->at(index);
1050 }
1051 }
1052
1053 bool nmethod::is_at_poll_return(address pc) {
1054 RelocIterator iter(this, pc, pc+1);
1055 while (iter.next()) {
1056 if (iter.type() == relocInfo::poll_return_type)
1057 return true;
1058 }
1059 return false;
1060 }
1061
1062
1063 bool nmethod::is_at_poll_or_poll_return(address pc) {
1064 RelocIterator iter(this, pc, pc+1);
1065 while (iter.next()) {
1066 relocInfo::relocType t = iter.type();
1067 if (t == relocInfo::poll_return_type || t == relocInfo::poll_type)
1068 return true;
1069 }
1070 return false;
1071 }
1072
1073
1074 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) {
1075 // re-patch all oop-bearing instructions, just in case some oops moved
1076 RelocIterator iter(this, begin, end);
1077 while (iter.next()) {
1078 if (iter.type() == relocInfo::oop_type) {
1079 oop_Relocation* reloc = iter.oop_reloc();
1080 if (initialize_immediates && reloc->oop_is_immediate()) {
1081 oop* dest = reloc->oop_addr();
1082 initialize_immediate_oop(dest, (jobject) *dest);
1083 }
1084 // Refresh the oop-related bits of this instruction.
1085 reloc->fix_oop_relocation();
1086 } else if (iter.type() == relocInfo::metadata_type) {
1087 metadata_Relocation* reloc = iter.metadata_reloc();
1088 reloc->fix_metadata_relocation();
1089 }
1090 }
1091 }
1092
1093
1094 void nmethod::verify_oop_relocations() {
1095 // Ensure sure that the code matches the current oop values
1096 RelocIterator iter(this, NULL, NULL);
1097 while (iter.next()) {
1098 if (iter.type() == relocInfo::oop_type) {
1099 oop_Relocation* reloc = iter.oop_reloc();
1100 if (!reloc->oop_is_immediate()) {
1101 reloc->verify_oop_relocation();
1102 }
1103 }
1104 }
1105 }
1106
1107
1108 ScopeDesc* nmethod::scope_desc_at(address pc) {
1109 PcDesc* pd = pc_desc_at(pc);
1110 guarantee(pd != NULL, "scope must be present");
1111 return new ScopeDesc(this, pd->scope_decode_offset(),
1112 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(),
1113 pd->return_oop());
1114 }
1115
1116
1117 void nmethod::clear_inline_caches() {
1118 assert(SafepointSynchronize::is_at_safepoint(), "cleaning of IC's only allowed at safepoint");
1119 if (is_zombie()) {
1120 return;
1121 }
1122
1123 RelocIterator iter(this);
1124 while (iter.next()) {
1125 iter.reloc()->clear_inline_cache();
1126 }
1127 }
1128
1129 // Clear ICStubs of all compiled ICs
1130 void nmethod::clear_ic_stubs() {
1131 assert_locked_or_safepoint(CompiledIC_lock);
1132 RelocIterator iter(this);
1133 while(iter.next()) {
1134 if (iter.type() == relocInfo::virtual_call_type) {
1135 CompiledIC* ic = CompiledIC_at(&iter);
1136 ic->clear_ic_stub();
1137 }
1138 }
1139 }
1140
1141
1142 void nmethod::cleanup_inline_caches() {
1143 assert_locked_or_safepoint(CompiledIC_lock);
1144
1145 // If the method is not entrant or zombie then a JMP is plastered over the
1146 // first few bytes. If an oop in the old code was there, that oop
1147 // should not get GC'd. Skip the first few bytes of oops on
1148 // not-entrant methods.
1149 address low_boundary = verified_entry_point();
1150 if (!is_in_use()) {
1151 low_boundary += NativeJump::instruction_size;
1152 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1153 // This means that the low_boundary is going to be a little too high.
1154 // This shouldn't matter, since oops of non-entrant methods are never used.
1155 // In fact, why are we bothering to look at oops in a non-entrant method??
1156 }
1157
1158 // Find all calls in an nmethod and clear the ones that point to non-entrant,
1159 // zombie and unloaded nmethods.
1160 ResourceMark rm;
1161 RelocIterator iter(this, low_boundary);
1162 while(iter.next()) {
1163 switch(iter.type()) {
1164 case relocInfo::virtual_call_type:
1165 case relocInfo::opt_virtual_call_type: {
1166 CompiledIC *ic = CompiledIC_at(&iter);
1167 // Ok, to lookup references to zombies here
1168 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
1169 if( cb != NULL && cb->is_nmethod() ) {
1170 nmethod* nm = (nmethod*)cb;
1171 // Clean inline caches pointing to zombie, non-entrant and unloaded methods
1172 if (!nm->is_in_use() || (nm->method()->code() != nm)) ic->set_to_clean(is_alive());
1173 }
1174 break;
1175 }
1176 case relocInfo::static_call_type: {
1177 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
1178 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
1179 if( cb != NULL && cb->is_nmethod() ) {
1180 nmethod* nm = (nmethod*)cb;
1181 // Clean inline caches pointing to zombie, non-entrant and unloaded methods
1182 if (!nm->is_in_use() || (nm->method()->code() != nm)) csc->set_to_clean();
1183 }
1184 break;
1185 }
1186 }
1187 }
1188 }
1189
1190 void nmethod::verify_clean_inline_caches() {
1191 assert_locked_or_safepoint(CompiledIC_lock);
1192
1193 // If the method is not entrant or zombie then a JMP is plastered over the
1194 // first few bytes. If an oop in the old code was there, that oop
1195 // should not get GC'd. Skip the first few bytes of oops on
1196 // not-entrant methods.
1197 address low_boundary = verified_entry_point();
1198 if (!is_in_use()) {
1199 low_boundary += NativeJump::instruction_size;
1200 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1201 // This means that the low_boundary is going to be a little too high.
1202 // This shouldn't matter, since oops of non-entrant methods are never used.
1203 // In fact, why are we bothering to look at oops in a non-entrant method??
1204 }
1205
1206 ResourceMark rm;
1207 RelocIterator iter(this, low_boundary);
1208 while(iter.next()) {
1209 switch(iter.type()) {
1210 case relocInfo::virtual_call_type:
1211 case relocInfo::opt_virtual_call_type: {
1212 CompiledIC *ic = CompiledIC_at(&iter);
1213 // Ok, to lookup references to zombies here
1214 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
1215 if( cb != NULL && cb->is_nmethod() ) {
1216 nmethod* nm = (nmethod*)cb;
1217 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
1218 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1219 assert(ic->is_clean(), "IC should be clean");
1220 }
1221 }
1222 break;
1223 }
1224 case relocInfo::static_call_type: {
1225 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
1226 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
1227 if( cb != NULL && cb->is_nmethod() ) {
1228 nmethod* nm = (nmethod*)cb;
1229 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
1230 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1231 assert(csc->is_clean(), "IC should be clean");
1232 }
1233 }
1234 break;
1235 }
1236 }
1237 }
1238 }
1239
1240 int nmethod::verify_icholder_relocations() {
1241 int count = 0;
1242
1243 RelocIterator iter(this);
1244 while(iter.next()) {
1245 if (iter.type() == relocInfo::virtual_call_type) {
1246 if (CompiledIC::is_icholder_call_site(iter.virtual_call_reloc())) {
1247 CompiledIC *ic = CompiledIC_at(&iter);
1248 if (TraceCompiledIC) {
1249 tty->print("noticed icholder " INTPTR_FORMAT " ", p2i(ic->cached_icholder()));
1250 ic->print();
1251 }
1252 assert(ic->cached_icholder() != NULL, "must be non-NULL");
1253 count++;
1254 }
1255 }
1256 }
1257
1258 return count;
1259 }
1260
1261 // This is a private interface with the sweeper.
1262 void nmethod::mark_as_seen_on_stack() {
1263 assert(is_alive(), "Must be an alive method");
1264 // Set the traversal mark to ensure that the sweeper does 2
1265 // cleaning passes before moving to zombie.
1266 set_stack_traversal_mark(NMethodSweeper::traversal_count());
1267 }
1268
1269 // Tell if a non-entrant method can be converted to a zombie (i.e.,
1270 // there are no activations on the stack, not in use by the VM,
1271 // and not in use by the ServiceThread)
1272 bool nmethod::can_convert_to_zombie() {
1273 assert(is_not_entrant(), "must be a non-entrant method");
1274
1275 // Since the nmethod sweeper only does partial sweep the sweeper's traversal
1276 // count can be greater than the stack traversal count before it hits the
1277 // nmethod for the second time.
1278 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count() &&
1279 !is_locked_by_vm();
1280 }
1281
1282 void nmethod::inc_decompile_count() {
1283 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return;
1284 // Could be gated by ProfileTraps, but do not bother...
1285 Method* m = method();
1286 if (m == NULL) return;
1287 MethodData* mdo = m->method_data();
1288 if (mdo == NULL) return;
1289 // There is a benign race here. See comments in methodData.hpp.
1290 mdo->inc_decompile_count();
1291 }
1292
1293 void nmethod::increase_unloading_clock() {
1294 _global_unloading_clock++;
1295 if (_global_unloading_clock == 0) {
1296 // _nmethods are allocated with _unloading_clock == 0,
1297 // so 0 is never used as a clock value.
1298 _global_unloading_clock = 1;
1299 }
1300 }
1301
1302 void nmethod::set_unloading_clock(unsigned char unloading_clock) {
1303 OrderAccess::release_store((volatile jubyte*)&_unloading_clock, unloading_clock);
1304 }
1305
1306 unsigned char nmethod::unloading_clock() {
1307 return (unsigned char)OrderAccess::load_acquire((volatile jubyte*)&_unloading_clock);
1308 }
1309
1310 void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) {
1311
1312 post_compiled_method_unload();
1313
1314 // Since this nmethod is being unloaded, make sure that dependencies
1315 // recorded in instanceKlasses get flushed and pass non-NULL closure to
1316 // indicate that this work is being done during a GC.
1317 assert(Universe::heap()->is_gc_active(), "should only be called during gc");
1318 assert(is_alive != NULL, "Should be non-NULL");
1319 // A non-NULL is_alive closure indicates that this is being called during GC.
1320 flush_dependencies(is_alive);
1321
1322 // Break cycle between nmethod & method
1323 if (log_is_enabled(Trace, classunload)) {
1324 outputStream* log = LogHandle(classunload)::trace_stream();
1325 log->print_cr("making nmethod " INTPTR_FORMAT
1326 " unloadable, Method*(" INTPTR_FORMAT
1327 "), cause(" INTPTR_FORMAT ")",
1328 p2i(this), p2i(_method), p2i(cause));
1329 if (!Universe::heap()->is_gc_active())
1330 cause->klass()->print_on(log);
1331 }
1332 // Unlink the osr method, so we do not look this up again
1333 if (is_osr_method()) {
1334 invalidate_osr_method();
1335 }
1336 // If _method is already NULL the Method* is about to be unloaded,
1337 // so we don't have to break the cycle. Note that it is possible to
1338 // have the Method* live here, in case we unload the nmethod because
1339 // it is pointing to some oop (other than the Method*) being unloaded.
1340 if (_method != NULL) {
1341 // OSR methods point to the Method*, but the Method* does not
1342 // point back!
1343 if (_method->code() == this) {
1344 _method->clear_code(); // Break a cycle
1345 }
1346 _method = NULL; // Clear the method of this dead nmethod
1347 }
1348
1349 // Make the class unloaded - i.e., change state and notify sweeper
1350 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
1351 if (is_in_use()) {
1352 // Transitioning directly from live to unloaded -- so
1353 // we need to force a cache clean-up; remember this
1354 // for later on.
1355 CodeCache::set_needs_cache_clean(true);
1356 }
1357
1358 // Unregister must be done before the state change
1359 Universe::heap()->unregister_nmethod(this);
1360
1361 _state = unloaded;
1362
1363 // Log the unloading.
1364 log_state_change();
1365
1366 #if INCLUDE_JVMCI
1367 // The method can only be unloaded after the pointer to the installed code
1368 // Java wrapper is no longer alive. Here we need to clear out this weak
1369 // reference to the dead object. Nulling out the reference has to happen
1370 // after the method is unregistered since the original value may be still
1371 // tracked by the rset.
1372 maybe_invalidate_installed_code();
1373 // Clear these out after the nmethod has been unregistered and any
1374 // updates to the InstalledCode instance have been performed.
1375 _jvmci_installed_code = NULL;
1376 _speculation_log = NULL;
1377 #endif
1378
1379 // The Method* is gone at this point
1380 assert(_method == NULL, "Tautology");
1381
1382 set_osr_link(NULL);
1383 //set_scavenge_root_link(NULL); // done by prune_scavenge_root_nmethods
1384 NMethodSweeper::report_state_change(this);
1385 }
1386
1387 void nmethod::invalidate_osr_method() {
1388 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
1389 #ifndef ASSERT
1390 // Make sure osr nmethod is invalidated only once
1391 if (!is_in_use()) {
1392 return;
1393 }
1394 #endif
1395 // Remove from list of active nmethods
1396 if (method() != NULL) {
1397 bool removed = method()->method_holder()->remove_osr_nmethod(this);
1398 assert(!removed || is_in_use(), "unused osr nmethod should be invalidated");
1399 }
1400 }
1401
1402 void nmethod::log_state_change() const {
1403 if (LogCompilation) {
1404 if (xtty != NULL) {
1405 ttyLocker ttyl; // keep the following output all in one block
1406 if (_state == unloaded) {
1407 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'",
1408 os::current_thread_id());
1409 } else {
1410 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s",
1411 os::current_thread_id(),
1412 (_state == zombie ? " zombie='1'" : ""));
1413 }
1414 log_identity(xtty);
1415 xtty->stamp();
1416 xtty->end_elem();
1417 }
1418 }
1419 if (PrintCompilation && _state != unloaded) {
1420 print_on(tty, _state == zombie ? "made zombie" : "made not entrant");
1421 }
1422 }
1423
1424 /**
1425 * Common functionality for both make_not_entrant and make_zombie
1426 */
1427 bool nmethod::make_not_entrant_or_zombie(unsigned int state) {
1428 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant");
1429 assert(!is_zombie(), "should not already be a zombie");
1430
1431 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below.
1432 nmethodLocker nml(this);
1433 methodHandle the_method(method());
1434 NoSafepointVerifier nsv;
1435
1436 // during patching, depending on the nmethod state we must notify the GC that
1437 // code has been unloaded, unregistering it. We cannot do this right while
1438 // holding the Patching_lock because we need to use the CodeCache_lock. This
1439 // would be prone to deadlocks.
1440 // This flag is used to remember whether we need to later lock and unregister.
1441 bool nmethod_needs_unregister = false;
1442
1443 {
1444 // invalidate osr nmethod before acquiring the patching lock since
1445 // they both acquire leaf locks and we don't want a deadlock.
1446 // This logic is equivalent to the logic below for patching the
1447 // verified entry point of regular methods.
1448 if (is_osr_method()) {
1449 // this effectively makes the osr nmethod not entrant
1450 invalidate_osr_method();
1451 }
1452
1453 // Enter critical section. Does not block for safepoint.
1454 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1455
1456 if (_state == state) {
1457 // another thread already performed this transition so nothing
1458 // to do, but return false to indicate this.
1459 return false;
1460 }
1461
1462 // The caller can be calling the method statically or through an inline
1463 // cache call.
1464 if (!is_osr_method() && !is_not_entrant()) {
1465 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
1466 SharedRuntime::get_handle_wrong_method_stub());
1467 }
1468
1469 if (is_in_use() && update_recompile_counts()) {
1470 // It's a true state change, so mark the method as decompiled.
1471 // Do it only for transition from alive.
1472 inc_decompile_count();
1473 }
1474
1475 // If the state is becoming a zombie, signal to unregister the nmethod with
1476 // the heap.
1477 // This nmethod may have already been unloaded during a full GC.
1478 if ((state == zombie) && !is_unloaded()) {
1479 nmethod_needs_unregister = true;
1480 }
1481
1482 // Must happen before state change. Otherwise we have a race condition in
1483 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately
1484 // transition its state from 'not_entrant' to 'zombie' without having to wait
1485 // for stack scanning.
1486 if (state == not_entrant) {
1487 mark_as_seen_on_stack();
1488 OrderAccess::storestore();
1489 }
1490
1491 // Change state
1492 _state = state;
1493
1494 // Log the transition once
1495 log_state_change();
1496
1497 // Invalidate while holding the patching lock
1498 JVMCI_ONLY(maybe_invalidate_installed_code());
1499
1500 // Remove nmethod from method.
1501 // We need to check if both the _code and _from_compiled_code_entry_point
1502 // refer to this nmethod because there is a race in setting these two fields
1503 // in Method* as seen in bugid 4947125.
1504 // If the vep() points to the zombie nmethod, the memory for the nmethod
1505 // could be flushed and the compiler and vtable stubs could still call
1506 // through it.
1507 if (method() != NULL && (method()->code() == this ||
1508 method()->from_compiled_entry() == verified_entry_point())) {
1509 HandleMark hm;
1510 method()->clear_code();
1511 }
1512 } // leave critical region under Patching_lock
1513
1514 // When the nmethod becomes zombie it is no longer alive so the
1515 // dependencies must be flushed. nmethods in the not_entrant
1516 // state will be flushed later when the transition to zombie
1517 // happens or they get unloaded.
1518 if (state == zombie) {
1519 {
1520 // Flushing dependencies must be done before any possible
1521 // safepoint can sneak in, otherwise the oops used by the
1522 // dependency logic could have become stale.
1523 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1524 if (nmethod_needs_unregister) {
1525 Universe::heap()->unregister_nmethod(this);
1526 #ifdef JVMCI
1527 _jvmci_installed_code = NULL;
1528 _speculation_log = NULL;
1529 #endif
1530 }
1531 flush_dependencies(NULL);
1532 }
1533
1534 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload
1535 // event and it hasn't already been reported for this nmethod then
1536 // report it now. The event may have been reported earlier if the GC
1537 // marked it for unloading). JvmtiDeferredEventQueue support means
1538 // we no longer go to a safepoint here.
1539 post_compiled_method_unload();
1540
1541 #ifdef ASSERT
1542 // It's no longer safe to access the oops section since zombie
1543 // nmethods aren't scanned for GC.
1544 _oops_are_stale = true;
1545 #endif
1546 // the Method may be reclaimed by class unloading now that the
1547 // nmethod is in zombie state
1548 set_method(NULL);
1549 } else {
1550 assert(state == not_entrant, "other cases may need to be handled differently");
1551 }
1552
1553 if (TraceCreateZombies) {
1554 ResourceMark m;
1555 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");
1556 }
1557
1558 NMethodSweeper::report_state_change(this);
1559 return true;
1560 }
1561
1562 void nmethod::flush() {
1563 // Note that there are no valid oops in the nmethod anymore.
1564 assert(!is_osr_method() || is_unloaded() || is_zombie(),
1565 "osr nmethod must be unloaded or zombie before flushing");
1566 assert(is_zombie() || is_osr_method(), "must be a zombie method");
1567 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed");
1568 assert_locked_or_safepoint(CodeCache_lock);
1569
1570 // completely deallocate this method
1571 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, p2i(this));
1572 if (PrintMethodFlushing) {
1573 tty->print_cr("*flushing %s nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT
1574 "/Free CodeCache:" SIZE_FORMAT "Kb",
1575 is_osr_method() ? "osr" : "",_compile_id, p2i(this), CodeCache::blob_count(),
1576 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024);
1577 }
1578
1579 // We need to deallocate any ExceptionCache data.
1580 // Note that we do not need to grab the nmethod lock for this, it
1581 // better be thread safe if we're disposing of it!
1582 ExceptionCache* ec = exception_cache();
1583 set_exception_cache(NULL);
1584 while(ec != NULL) {
1585 ExceptionCache* next = ec->next();
1586 delete ec;
1587 ec = next;
1588 }
1589
1590 if (on_scavenge_root_list()) {
1591 CodeCache::drop_scavenge_root_nmethod(this);
1592 }
1593
1594 #ifdef SHARK
1595 ((SharkCompiler *) compiler())->free_compiled_method(insts_begin());
1596 #endif // SHARK
1597
1598 ((CodeBlob*)(this))->flush();
1599
1600 CodeCache::free(this);
1601 }
1602
1603 //
1604 // Notify all classes this nmethod is dependent on that it is no
1605 // longer dependent. This should only be called in two situations.
1606 // First, when a nmethod transitions to a zombie all dependents need
1607 // to be clear. Since zombification happens at a safepoint there's no
1608 // synchronization issues. The second place is a little more tricky.
1609 // During phase 1 of mark sweep class unloading may happen and as a
1610 // result some nmethods may get unloaded. In this case the flushing
1611 // of dependencies must happen during phase 1 since after GC any
1612 // dependencies in the unloaded nmethod won't be updated, so
1613 // traversing the dependency information in unsafe. In that case this
1614 // function is called with a non-NULL argument and this function only
1615 // notifies instanceKlasses that are reachable
1616
1617 void nmethod::flush_dependencies(BoolObjectClosure* is_alive) {
1618 assert_locked_or_safepoint(CodeCache_lock);
1619 assert(Universe::heap()->is_gc_active() == (is_alive != NULL),
1620 "is_alive is non-NULL if and only if we are called during GC");
1621 if (!has_flushed_dependencies()) {
1622 set_has_flushed_dependencies();
1623 for (Dependencies::DepStream deps(this); deps.next(); ) {
1624 if (deps.type() == Dependencies::call_site_target_value) {
1625 // CallSite dependencies are managed on per-CallSite instance basis.
1626 oop call_site = deps.argument_oop(0);
1627 MethodHandles::remove_dependent_nmethod(call_site, this);
1628 } else {
1629 Klass* klass = deps.context_type();
1630 if (klass == NULL) {
1631 continue; // ignore things like evol_method
1632 }
1633 // During GC the is_alive closure is non-NULL, and is used to
1634 // determine liveness of dependees that need to be updated.
1635 if (is_alive == NULL || klass->is_loader_alive(is_alive)) {
1636 // The GC defers deletion of this entry, since there might be multiple threads
1637 // iterating over the _dependencies graph. Other call paths are single-threaded
1638 // and may delete it immediately.
1639 bool delete_immediately = is_alive == NULL;
1640 InstanceKlass::cast(klass)->remove_dependent_nmethod(this, delete_immediately);
1641 }
1642 }
1643 }
1644 }
1645 }
1646
1647
1648 // If this oop is not live, the nmethod can be unloaded.
1649 bool nmethod::can_unload(BoolObjectClosure* is_alive, oop* root, bool unloading_occurred) {
1650 assert(root != NULL, "just checking");
1651 oop obj = *root;
1652 if (obj == NULL || is_alive->do_object_b(obj)) {
1653 return false;
1654 }
1655
1656 // If ScavengeRootsInCode is true, an nmethod might be unloaded
1657 // simply because one of its constant oops has gone dead.
1658 // No actual classes need to be unloaded in order for this to occur.
1659 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading");
1660 make_unloaded(is_alive, obj);
1661 return true;
1662 }
1663
1664 // ------------------------------------------------------------------
1665 // post_compiled_method_load_event
1666 // new method for install_code() path
1667 // Transfer information from compilation to jvmti
1668 void nmethod::post_compiled_method_load_event() {
1669
1670 Method* moop = method();
1671 HOTSPOT_COMPILED_METHOD_LOAD(
1672 (char *) moop->klass_name()->bytes(),
1673 moop->klass_name()->utf8_length(),
1674 (char *) moop->name()->bytes(),
1675 moop->name()->utf8_length(),
1676 (char *) moop->signature()->bytes(),
1677 moop->signature()->utf8_length(),
1678 insts_begin(), insts_size());
1679
1680 if (JvmtiExport::should_post_compiled_method_load() ||
1681 JvmtiExport::should_post_compiled_method_unload()) {
1682 get_and_cache_jmethod_id();
1683 }
1684
1685 if (JvmtiExport::should_post_compiled_method_load()) {
1686 // Let the Service thread (which is a real Java thread) post the event
1687 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1688 JvmtiDeferredEventQueue::enqueue(
1689 JvmtiDeferredEvent::compiled_method_load_event(this));
1690 }
1691 }
1692
1693 jmethodID nmethod::get_and_cache_jmethod_id() {
1694 if (_jmethod_id == NULL) {
1695 // Cache the jmethod_id since it can no longer be looked up once the
1696 // method itself has been marked for unloading.
1697 _jmethod_id = method()->jmethod_id();
1698 }
1699 return _jmethod_id;
1700 }
1701
1702 void nmethod::post_compiled_method_unload() {
1703 if (unload_reported()) {
1704 // During unloading we transition to unloaded and then to zombie
1705 // and the unloading is reported during the first transition.
1706 return;
1707 }
1708
1709 assert(_method != NULL && !is_unloaded(), "just checking");
1710 DTRACE_METHOD_UNLOAD_PROBE(method());
1711
1712 // If a JVMTI agent has enabled the CompiledMethodUnload event then
1713 // post the event. Sometime later this nmethod will be made a zombie
1714 // by the sweeper but the Method* will not be valid at that point.
1715 // If the _jmethod_id is null then no load event was ever requested
1716 // so don't bother posting the unload. The main reason for this is
1717 // that the jmethodID is a weak reference to the Method* so if
1718 // it's being unloaded there's no way to look it up since the weak
1719 // ref will have been cleared.
1720 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) {
1721 assert(!unload_reported(), "already unloaded");
1722 JvmtiDeferredEvent event =
1723 JvmtiDeferredEvent::compiled_method_unload_event(this,
1724 _jmethod_id, insts_begin());
1725 if (SafepointSynchronize::is_at_safepoint()) {
1726 // Don't want to take the queueing lock. Add it as pending and
1727 // it will get enqueued later.
1728 JvmtiDeferredEventQueue::add_pending_event(event);
1729 } else {
1730 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1731 JvmtiDeferredEventQueue::enqueue(event);
1732 }
1733 }
1734
1735 // The JVMTI CompiledMethodUnload event can be enabled or disabled at
1736 // any time. As the nmethod is being unloaded now we mark it has
1737 // having the unload event reported - this will ensure that we don't
1738 // attempt to report the event in the unlikely scenario where the
1739 // event is enabled at the time the nmethod is made a zombie.
1740 set_unload_reported();
1741 }
1742
1743 void static clean_ic_if_metadata_is_dead(CompiledIC *ic, BoolObjectClosure *is_alive) {
1744 if (ic->is_icholder_call()) {
1745 // The only exception is compiledICHolder oops which may
1746 // yet be marked below. (We check this further below).
1747 CompiledICHolder* cichk_oop = ic->cached_icholder();
1748
1749 if (cichk_oop->holder_method()->method_holder()->is_loader_alive(is_alive) &&
1750 cichk_oop->holder_klass()->is_loader_alive(is_alive)) {
1751 return;
1752 }
1753 } else {
1754 Metadata* ic_oop = ic->cached_metadata();
1755 if (ic_oop != NULL) {
1756 if (ic_oop->is_klass()) {
1757 if (((Klass*)ic_oop)->is_loader_alive(is_alive)) {
1758 return;
1759 }
1760 } else if (ic_oop->is_method()) {
1761 if (((Method*)ic_oop)->method_holder()->is_loader_alive(is_alive)) {
1762 return;
1763 }
1764 } else {
1765 ShouldNotReachHere();
1766 }
1767 }
1768 }
1769
1770 ic->set_to_clean();
1771 }
1772
1773 // This is called at the end of the strong tracing/marking phase of a
1774 // GC to unload an nmethod if it contains otherwise unreachable
1775 // oops.
1776
1777 void nmethod::do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred) {
1778 // Make sure the oop's ready to receive visitors
1779 assert(!is_zombie() && !is_unloaded(),
1780 "should not call follow on zombie or unloaded nmethod");
1781
1782 // If the method is not entrant then a JMP is plastered over the
1783 // first few bytes. If an oop in the old code was there, that oop
1784 // should not get GC'd. Skip the first few bytes of oops on
1785 // not-entrant methods.
1786 address low_boundary = verified_entry_point();
1787 if (is_not_entrant()) {
1788 low_boundary += NativeJump::instruction_size;
1789 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1790 // (See comment above.)
1791 }
1792
1793 // The RedefineClasses() API can cause the class unloading invariant
1794 // to no longer be true. See jvmtiExport.hpp for details.
1795 // Also, leave a debugging breadcrumb in local flag.
1796 if (JvmtiExport::has_redefined_a_class()) {
1797 // This set of the unloading_occurred flag is done before the
1798 // call to post_compiled_method_unload() so that the unloading
1799 // of this nmethod is reported.
1800 unloading_occurred = true;
1801 }
1802
1803 // Exception cache
1804 clean_exception_cache(is_alive);
1805
1806 // If class unloading occurred we first iterate over all inline caches and
1807 // clear ICs where the cached oop is referring to an unloaded klass or method.
1808 // The remaining live cached oops will be traversed in the relocInfo::oop_type
1809 // iteration below.
1810 if (unloading_occurred) {
1811 RelocIterator iter(this, low_boundary);
1812 while(iter.next()) {
1813 if (iter.type() == relocInfo::virtual_call_type) {
1814 CompiledIC *ic = CompiledIC_at(&iter);
1815 clean_ic_if_metadata_is_dead(ic, is_alive);
1816 }
1817 }
1818 }
1819
1820 // Compiled code
1821 {
1822 RelocIterator iter(this, low_boundary);
1823 while (iter.next()) {
1824 if (iter.type() == relocInfo::oop_type) {
1825 oop_Relocation* r = iter.oop_reloc();
1826 // In this loop, we must only traverse those oops directly embedded in
1827 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1828 assert(1 == (r->oop_is_immediate()) +
1829 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1830 "oop must be found in exactly one place");
1831 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1832 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) {
1833 return;
1834 }
1835 }
1836 }
1837 }
1838 }
1839
1840
1841 // Scopes
1842 for (oop* p = oops_begin(); p < oops_end(); p++) {
1843 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1844 if (can_unload(is_alive, p, unloading_occurred)) {
1845 return;
1846 }
1847 }
1848
1849 #if INCLUDE_JVMCI
1850 // Follow JVMCI method
1851 BarrierSet* bs = Universe::heap()->barrier_set();
1852 if (_jvmci_installed_code != NULL) {
1853 if (_jvmci_installed_code->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(_jvmci_installed_code)) {
1854 if (!is_alive->do_object_b(_jvmci_installed_code)) {
1855 clear_jvmci_installed_code();
1856 }
1857 } else {
1858 if (can_unload(is_alive, (oop*)&_jvmci_installed_code, unloading_occurred)) {
1859 return;
1860 }
1861 }
1862 }
1863
1864 if (_speculation_log != NULL) {
1865 if (!is_alive->do_object_b(_speculation_log)) {
1866 bs->write_ref_nmethod_pre(&_speculation_log, this);
1867 _speculation_log = NULL;
1868 bs->write_ref_nmethod_post(&_speculation_log, this);
1869 }
1870 }
1871 #endif
1872
1873
1874 // Ensure that all metadata is still alive
1875 verify_metadata_loaders(low_boundary, is_alive);
1876 }
1877
1878 template <class CompiledICorStaticCall>
1879 static bool clean_if_nmethod_is_unloaded(CompiledICorStaticCall *ic, address addr, BoolObjectClosure *is_alive, nmethod* from) {
1880 // Ok, to lookup references to zombies here
1881 CodeBlob *cb = CodeCache::find_blob_unsafe(addr);
1882 if (cb != NULL && cb->is_nmethod()) {
1883 nmethod* nm = (nmethod*)cb;
1884
1885 if (nm->unloading_clock() != nmethod::global_unloading_clock()) {
1886 // The nmethod has not been processed yet.
1887 return true;
1888 }
1889
1890 // Clean inline caches pointing to both zombie and not_entrant methods
1891 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1892 ic->set_to_clean();
1893 assert(ic->is_clean(), "nmethod " PTR_FORMAT "not clean %s", p2i(from), from->method()->name_and_sig_as_C_string());
1894 }
1895 }
1896
1897 return false;
1898 }
1899
1900 static bool clean_if_nmethod_is_unloaded(CompiledIC *ic, BoolObjectClosure *is_alive, nmethod* from) {
1901 return clean_if_nmethod_is_unloaded(ic, ic->ic_destination(), is_alive, from);
1902 }
1903
1904 static bool clean_if_nmethod_is_unloaded(CompiledStaticCall *csc, BoolObjectClosure *is_alive, nmethod* from) {
1905 return clean_if_nmethod_is_unloaded(csc, csc->destination(), is_alive, from);
1906 }
1907
1908 bool nmethod::unload_if_dead_at(RelocIterator* iter_at_oop, BoolObjectClosure *is_alive, bool unloading_occurred) {
1909 assert(iter_at_oop->type() == relocInfo::oop_type, "Wrong relocation type");
1910
1911 oop_Relocation* r = iter_at_oop->oop_reloc();
1912 // Traverse those oops directly embedded in the code.
1913 // Other oops (oop_index>0) are seen as part of scopes_oops.
1914 assert(1 == (r->oop_is_immediate()) +
1915 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1916 "oop must be found in exactly one place");
1917 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1918 // Unload this nmethod if the oop is dead.
1919 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) {
1920 return true;;
1921 }
1922 }
1923
1924 return false;
1925 }
1926
1927
1928 bool nmethod::do_unloading_parallel(BoolObjectClosure* is_alive, bool unloading_occurred) {
1929 ResourceMark rm;
1930
1931 // Make sure the oop's ready to receive visitors
1932 assert(!is_zombie() && !is_unloaded(),
1933 "should not call follow on zombie or unloaded nmethod");
1934
1935 // If the method is not entrant then a JMP is plastered over the
1936 // first few bytes. If an oop in the old code was there, that oop
1937 // should not get GC'd. Skip the first few bytes of oops on
1938 // not-entrant methods.
1939 address low_boundary = verified_entry_point();
1940 if (is_not_entrant()) {
1941 low_boundary += NativeJump::instruction_size;
1942 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1943 // (See comment above.)
1944 }
1945
1946 // The RedefineClasses() API can cause the class unloading invariant
1947 // to no longer be true. See jvmtiExport.hpp for details.
1948 // Also, leave a debugging breadcrumb in local flag.
1949 if (JvmtiExport::has_redefined_a_class()) {
1950 // This set of the unloading_occurred flag is done before the
1951 // call to post_compiled_method_unload() so that the unloading
1952 // of this nmethod is reported.
1953 unloading_occurred = true;
1954 }
1955
1956 // Exception cache
1957 clean_exception_cache(is_alive);
1958
1959 bool is_unloaded = false;
1960 bool postponed = false;
1961
1962 RelocIterator iter(this, low_boundary);
1963 while(iter.next()) {
1964
1965 switch (iter.type()) {
1966
1967 case relocInfo::virtual_call_type:
1968 if (unloading_occurred) {
1969 // If class unloading occurred we first iterate over all inline caches and
1970 // clear ICs where the cached oop is referring to an unloaded klass or method.
1971 clean_ic_if_metadata_is_dead(CompiledIC_at(&iter), is_alive);
1972 }
1973
1974 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
1975 break;
1976
1977 case relocInfo::opt_virtual_call_type:
1978 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
1979 break;
1980
1981 case relocInfo::static_call_type:
1982 postponed |= clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this);
1983 break;
1984
1985 case relocInfo::oop_type:
1986 if (!is_unloaded) {
1987 is_unloaded = unload_if_dead_at(&iter, is_alive, unloading_occurred);
1988 }
1989 break;
1990
1991 case relocInfo::metadata_type:
1992 break; // nothing to do.
1993 }
1994 }
1995
1996 if (is_unloaded) {
1997 return postponed;
1998 }
1999
2000 // Scopes
2001 for (oop* p = oops_begin(); p < oops_end(); p++) {
2002 if (*p == Universe::non_oop_word()) continue; // skip non-oops
2003 if (can_unload(is_alive, p, unloading_occurred)) {
2004 is_unloaded = true;
2005 break;
2006 }
2007 }
2008
2009 if (is_unloaded) {
2010 return postponed;
2011 }
2012
2013 #if INCLUDE_JVMCI
2014 // Follow JVMCI method
2015 BarrierSet* bs = Universe::heap()->barrier_set();
2016 if (_jvmci_installed_code != NULL) {
2017 if (_jvmci_installed_code->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(_jvmci_installed_code)) {
2018 if (!is_alive->do_object_b(_jvmci_installed_code)) {
2019 clear_jvmci_installed_code();
2020 }
2021 } else {
2022 if (can_unload(is_alive, (oop*)&_jvmci_installed_code, unloading_occurred)) {
2023 is_unloaded = true;
2024 }
2025 }
2026 }
2027
2028 if (_speculation_log != NULL) {
2029 if (!is_alive->do_object_b(_speculation_log)) {
2030 bs->write_ref_nmethod_pre(&_speculation_log, this);
2031 _speculation_log = NULL;
2032 bs->write_ref_nmethod_post(&_speculation_log, this);
2033 }
2034 }
2035 #endif
2036
2037 // Ensure that all metadata is still alive
2038 verify_metadata_loaders(low_boundary, is_alive);
2039
2040 return postponed;
2041 }
2042
2043 void nmethod::do_unloading_parallel_postponed(BoolObjectClosure* is_alive, bool unloading_occurred) {
2044 ResourceMark rm;
2045
2046 // Make sure the oop's ready to receive visitors
2047 assert(!is_zombie(),
2048 "should not call follow on zombie nmethod");
2049
2050 // If the method is not entrant then a JMP is plastered over the
2051 // first few bytes. If an oop in the old code was there, that oop
2052 // should not get GC'd. Skip the first few bytes of oops on
2053 // not-entrant methods.
2054 address low_boundary = verified_entry_point();
2055 if (is_not_entrant()) {
2056 low_boundary += NativeJump::instruction_size;
2057 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
2058 // (See comment above.)
2059 }
2060
2061 RelocIterator iter(this, low_boundary);
2062 while(iter.next()) {
2063
2064 switch (iter.type()) {
2065
2066 case relocInfo::virtual_call_type:
2067 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
2068 break;
2069
2070 case relocInfo::opt_virtual_call_type:
2071 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
2072 break;
2073
2074 case relocInfo::static_call_type:
2075 clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this);
2076 break;
2077 }
2078 }
2079 }
2080
2081 #ifdef ASSERT
2082
2083 class CheckClass : AllStatic {
2084 static BoolObjectClosure* _is_alive;
2085
2086 // Check class_loader is alive for this bit of metadata.
2087 static void check_class(Metadata* md) {
2088 Klass* klass = NULL;
2089 if (md->is_klass()) {
2090 klass = ((Klass*)md);
2091 } else if (md->is_method()) {
2092 klass = ((Method*)md)->method_holder();
2093 } else if (md->is_methodData()) {
2094 klass = ((MethodData*)md)->method()->method_holder();
2095 } else {
2096 md->print();
2097 ShouldNotReachHere();
2098 }
2099 assert(klass->is_loader_alive(_is_alive), "must be alive");
2100 }
2101 public:
2102 static void do_check_class(BoolObjectClosure* is_alive, nmethod* nm) {
2103 assert(SafepointSynchronize::is_at_safepoint(), "this is only ok at safepoint");
2104 _is_alive = is_alive;
2105 nm->metadata_do(check_class);
2106 }
2107 };
2108
2109 // This is called during a safepoint so can use static data
2110 BoolObjectClosure* CheckClass::_is_alive = NULL;
2111 #endif // ASSERT
2112
2113
2114 // Processing of oop references should have been sufficient to keep
2115 // all strong references alive. Any weak references should have been
2116 // cleared as well. Visit all the metadata and ensure that it's
2117 // really alive.
2118 void nmethod::verify_metadata_loaders(address low_boundary, BoolObjectClosure* is_alive) {
2119 #ifdef ASSERT
2120 RelocIterator iter(this, low_boundary);
2121 while (iter.next()) {
2122 // static_stub_Relocations may have dangling references to
2123 // Method*s so trim them out here. Otherwise it looks like
2124 // compiled code is maintaining a link to dead metadata.
2125 address static_call_addr = NULL;
2126 if (iter.type() == relocInfo::opt_virtual_call_type) {
2127 CompiledIC* cic = CompiledIC_at(&iter);
2128 if (!cic->is_call_to_interpreted()) {
2129 static_call_addr = iter.addr();
2130 }
2131 } else if (iter.type() == relocInfo::static_call_type) {
2132 CompiledStaticCall* csc = compiledStaticCall_at(iter.reloc());
2133 if (!csc->is_call_to_interpreted()) {
2134 static_call_addr = iter.addr();
2135 }
2136 }
2137 if (static_call_addr != NULL) {
2138 RelocIterator sciter(this, low_boundary);
2139 while (sciter.next()) {
2140 if (sciter.type() == relocInfo::static_stub_type &&
2141 sciter.static_stub_reloc()->static_call() == static_call_addr) {
2142 sciter.static_stub_reloc()->clear_inline_cache();
2143 }
2144 }
2145 }
2146 }
2147 // Check that the metadata embedded in the nmethod is alive
2148 CheckClass::do_check_class(is_alive, this);
2149 #endif
2150 }
2151
2152
2153 // Iterate over metadata calling this function. Used by RedefineClasses
2154 void nmethod::metadata_do(void f(Metadata*)) {
2155 address low_boundary = verified_entry_point();
2156 if (is_not_entrant()) {
2157 low_boundary += NativeJump::instruction_size;
2158 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
2159 // (See comment above.)
2160 }
2161 {
2162 // Visit all immediate references that are embedded in the instruction stream.
2163 RelocIterator iter(this, low_boundary);
2164 while (iter.next()) {
2165 if (iter.type() == relocInfo::metadata_type ) {
2166 metadata_Relocation* r = iter.metadata_reloc();
2167 // In this metadata, we must only follow those metadatas directly embedded in
2168 // the code. Other metadatas (oop_index>0) are seen as part of
2169 // the metadata section below.
2170 assert(1 == (r->metadata_is_immediate()) +
2171 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
2172 "metadata must be found in exactly one place");
2173 if (r->metadata_is_immediate() && r->metadata_value() != NULL) {
2174 Metadata* md = r->metadata_value();
2175 if (md != _method) f(md);
2176 }
2177 } else if (iter.type() == relocInfo::virtual_call_type) {
2178 // Check compiledIC holders associated with this nmethod
2179 CompiledIC *ic = CompiledIC_at(&iter);
2180 if (ic->is_icholder_call()) {
2181 CompiledICHolder* cichk = ic->cached_icholder();
2182 f(cichk->holder_method());
2183 f(cichk->holder_klass());
2184 } else {
2185 Metadata* ic_oop = ic->cached_metadata();
2186 if (ic_oop != NULL) {
2187 f(ic_oop);
2188 }
2189 }
2190 }
2191 }
2192 }
2193
2194 // Visit the metadata section
2195 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
2196 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops
2197 Metadata* md = *p;
2198 f(md);
2199 }
2200
2201 // Visit metadata not embedded in the other places.
2202 if (_method != NULL) f(_method);
2203 }
2204
2205 void nmethod::oops_do(OopClosure* f, bool allow_zombie) {
2206 // make sure the oops ready to receive visitors
2207 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod");
2208 assert(!is_unloaded(), "should not call follow on unloaded nmethod");
2209
2210 // If the method is not entrant or zombie then a JMP is plastered over the
2211 // first few bytes. If an oop in the old code was there, that oop
2212 // should not get GC'd. Skip the first few bytes of oops on
2213 // not-entrant methods.
2214 address low_boundary = verified_entry_point();
2215 if (is_not_entrant()) {
2216 low_boundary += NativeJump::instruction_size;
2217 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
2218 // (See comment above.)
2219 }
2220
2221 #if INCLUDE_JVMCI
2222 if (_jvmci_installed_code != NULL) {
2223 f->do_oop((oop*) &_jvmci_installed_code);
2224 }
2225 if (_speculation_log != NULL) {
2226 f->do_oop((oop*) &_speculation_log);
2227 }
2228 #endif
2229
2230 RelocIterator iter(this, low_boundary);
2231
2232 while (iter.next()) {
2233 if (iter.type() == relocInfo::oop_type ) {
2234 oop_Relocation* r = iter.oop_reloc();
2235 // In this loop, we must only follow those oops directly embedded in
2236 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
2237 assert(1 == (r->oop_is_immediate()) +
2238 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
2239 "oop must be found in exactly one place");
2240 if (r->oop_is_immediate() && r->oop_value() != NULL) {
2241 f->do_oop(r->oop_addr());
2242 }
2243 }
2244 }
2245
2246 // Scopes
2247 // This includes oop constants not inlined in the code stream.
2248 for (oop* p = oops_begin(); p < oops_end(); p++) {
2249 if (*p == Universe::non_oop_word()) continue; // skip non-oops
2250 f->do_oop(p);
2251 }
2252 }
2253
2254 #define NMETHOD_SENTINEL ((nmethod*)badAddress)
2255
2256 nmethod* volatile nmethod::_oops_do_mark_nmethods;
2257
2258 // An nmethod is "marked" if its _mark_link is set non-null.
2259 // Even if it is the end of the linked list, it will have a non-null link value,
2260 // as long as it is on the list.
2261 // This code must be MP safe, because it is used from parallel GC passes.
2262 bool nmethod::test_set_oops_do_mark() {
2263 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");
2264 nmethod* observed_mark_link = _oops_do_mark_link;
2265 if (observed_mark_link == NULL) {
2266 // Claim this nmethod for this thread to mark.
2267 observed_mark_link = (nmethod*)
2268 Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_link, NULL);
2269 if (observed_mark_link == NULL) {
2270
2271 // Atomically append this nmethod (now claimed) to the head of the list:
2272 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods;
2273 for (;;) {
2274 nmethod* required_mark_nmethods = observed_mark_nmethods;
2275 _oops_do_mark_link = required_mark_nmethods;
2276 observed_mark_nmethods = (nmethod*)
2277 Atomic::cmpxchg_ptr(this, &_oops_do_mark_nmethods, required_mark_nmethods);
2278 if (observed_mark_nmethods == required_mark_nmethods)
2279 break;
2280 }
2281 // Mark was clear when we first saw this guy.
2282 if (TraceScavenge) { print_on(tty, "oops_do, mark"); }
2283 return false;
2284 }
2285 }
2286 // On fall through, another racing thread marked this nmethod before we did.
2287 return true;
2288 }
2289
2290 void nmethod::oops_do_marking_prologue() {
2291 if (TraceScavenge) { tty->print_cr("[oops_do_marking_prologue"); }
2292 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row");
2293 // We use cmpxchg_ptr instead of regular assignment here because the user
2294 // may fork a bunch of threads, and we need them all to see the same state.
2295 void* observed = Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, NULL);
2296 guarantee(observed == NULL, "no races in this sequential code");
2297 }
2298
2299 void nmethod::oops_do_marking_epilogue() {
2300 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row");
2301 nmethod* cur = _oops_do_mark_nmethods;
2302 while (cur != NMETHOD_SENTINEL) {
2303 assert(cur != NULL, "not NULL-terminated");
2304 nmethod* next = cur->_oops_do_mark_link;
2305 cur->_oops_do_mark_link = NULL;
2306 DEBUG_ONLY(cur->verify_oop_relocations());
2307 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark"));
2308 cur = next;
2309 }
2310 void* required = _oops_do_mark_nmethods;
2311 void* observed = Atomic::cmpxchg_ptr(NULL, &_oops_do_mark_nmethods, required);
2312 guarantee(observed == required, "no races in this sequential code");
2313 if (TraceScavenge) { tty->print_cr("oops_do_marking_epilogue]"); }
2314 }
2315
2316 class DetectScavengeRoot: public OopClosure {
2317 bool _detected_scavenge_root;
2318 public:
2319 DetectScavengeRoot() : _detected_scavenge_root(false)
2320 { NOT_PRODUCT(_print_nm = NULL); }
2321 bool detected_scavenge_root() { return _detected_scavenge_root; }
2322 virtual void do_oop(oop* p) {
2323 if ((*p) != NULL && (*p)->is_scavengable()) {
2324 NOT_PRODUCT(maybe_print(p));
2325 _detected_scavenge_root = true;
2326 }
2327 }
2328 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2329
2330 #ifndef PRODUCT
2331 nmethod* _print_nm;
2332 void maybe_print(oop* p) {
2333 if (_print_nm == NULL) return;
2334 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root");
2335 tty->print_cr("" PTR_FORMAT "[offset=%d] detected scavengable oop " PTR_FORMAT " (found at " PTR_FORMAT ")",
2336 p2i(_print_nm), (int)((intptr_t)p - (intptr_t)_print_nm),
2337 p2i(*p), p2i(p));
2338 (*p)->print();
2339 }
2340 #endif //PRODUCT
2341 };
2342
2343 bool nmethod::detect_scavenge_root_oops() {
2344 DetectScavengeRoot detect_scavenge_root;
2345 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this);
2346 oops_do(&detect_scavenge_root);
2347 return detect_scavenge_root.detected_scavenge_root();
2348 }
2349
2350 // Method that knows how to preserve outgoing arguments at call. This method must be
2351 // called with a frame corresponding to a Java invoke
2352 void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) {
2353 #ifndef SHARK
2354 if (method() != NULL && !method()->is_native()) {
2355 address pc = fr.pc();
2356 SimpleScopeDesc ssd(this, pc);
2357 Bytecode_invoke call(ssd.method(), ssd.bci());
2358 bool has_receiver = call.has_receiver();
2359 bool has_appendix = call.has_appendix();
2360 Symbol* signature = call.signature();
2361
2362 // The method attached by JIT-compilers should be used, if present.
2363 // Bytecode can be inaccurate in such case.
2364 Method* callee = attached_method_before_pc(pc);
2365 if (callee != NULL) {
2366 has_receiver = !(callee->access_flags().is_static());
2367 has_appendix = false;
2368 signature = callee->signature();
2369 }
2370
2371 fr.oops_compiled_arguments_do(signature, has_receiver, has_appendix, reg_map, f);
2372 }
2373 #endif // !SHARK
2374 }
2375
2376 inline bool includes(void* p, void* from, void* to) {
2377 return from <= p && p < to;
2378 }
2379
2380
2381 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
2382 assert(count >= 2, "must be sentinel values, at least");
2383
2384 #ifdef ASSERT
2385 // must be sorted and unique; we do a binary search in find_pc_desc()
2386 int prev_offset = pcs[0].pc_offset();
2387 assert(prev_offset == PcDesc::lower_offset_limit,
2388 "must start with a sentinel");
2389 for (int i = 1; i < count; i++) {
2390 int this_offset = pcs[i].pc_offset();
2391 assert(this_offset > prev_offset, "offsets must be sorted");
2392 prev_offset = this_offset;
2393 }
2394 assert(prev_offset == PcDesc::upper_offset_limit,
2395 "must end with a sentinel");
2396 #endif //ASSERT
2397
2398 // Search for MethodHandle invokes and tag the nmethod.
2399 for (int i = 0; i < count; i++) {
2400 if (pcs[i].is_method_handle_invoke()) {
2401 set_has_method_handle_invokes(true);
2402 break;
2403 }
2404 }
2405 assert(has_method_handle_invokes() == (_deoptimize_mh_offset != -1), "must have deopt mh handler");
2406
2407 int size = count * sizeof(PcDesc);
2408 assert(scopes_pcs_size() >= size, "oob");
2409 memcpy(scopes_pcs_begin(), pcs, size);
2410
2411 // Adjust the final sentinel downward.
2412 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
2413 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
2414 last_pc->set_pc_offset(content_size() + 1);
2415 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
2416 // Fill any rounding gaps with copies of the last record.
2417 last_pc[1] = last_pc[0];
2418 }
2419 // The following assert could fail if sizeof(PcDesc) is not
2420 // an integral multiple of oopSize (the rounding term).
2421 // If it fails, change the logic to always allocate a multiple
2422 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
2423 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
2424 }
2425
2426 void nmethod::copy_scopes_data(u_char* buffer, int size) {
2427 assert(scopes_data_size() >= size, "oob");
2428 memcpy(scopes_data_begin(), buffer, size);
2429 }
2430
2431 // When using JVMCI the address might be off by the size of a call instruction.
2432 bool nmethod::is_deopt_entry(address pc) {
2433 return pc == deopt_handler_begin()
2434 #if INCLUDE_JVMCI
2435 || pc == (deopt_handler_begin() + NativeCall::instruction_size)
2436 #endif
2437 ;
2438 }
2439
2440 #ifdef ASSERT
2441 static PcDesc* linear_search(nmethod* nm, int pc_offset, bool approximate) {
2442 PcDesc* lower = nm->scopes_pcs_begin();
2443 PcDesc* upper = nm->scopes_pcs_end();
2444 lower += 1; // exclude initial sentinel
2445 PcDesc* res = NULL;
2446 for (PcDesc* p = lower; p < upper; p++) {
2447 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc
2448 if (match_desc(p, pc_offset, approximate)) {
2449 if (res == NULL)
2450 res = p;
2451 else
2452 res = (PcDesc*) badAddress;
2453 }
2454 }
2455 return res;
2456 }
2457 #endif
2458
2459
2460 // Finds a PcDesc with real-pc equal to "pc"
2461 PcDesc* nmethod::find_pc_desc_internal(address pc, bool approximate) {
2462 address base_address = code_begin();
2463 if ((pc < base_address) ||
2464 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
2465 return NULL; // PC is wildly out of range
2466 }
2467 int pc_offset = (int) (pc - base_address);
2468
2469 // Check the PcDesc cache if it contains the desired PcDesc
2470 // (This as an almost 100% hit rate.)
2471 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
2472 if (res != NULL) {
2473 assert(res == linear_search(this, pc_offset, approximate), "cache ok");
2474 return res;
2475 }
2476
2477 // Fallback algorithm: quasi-linear search for the PcDesc
2478 // Find the last pc_offset less than the given offset.
2479 // The successor must be the required match, if there is a match at all.
2480 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
2481 PcDesc* lower = scopes_pcs_begin();
2482 PcDesc* upper = scopes_pcs_end();
2483 upper -= 1; // exclude final sentinel
2484 if (lower >= upper) return NULL; // native method; no PcDescs at all
2485
2486 #define assert_LU_OK \
2487 /* invariant on lower..upper during the following search: */ \
2488 assert(lower->pc_offset() < pc_offset, "sanity"); \
2489 assert(upper->pc_offset() >= pc_offset, "sanity")
2490 assert_LU_OK;
2491
2492 // Use the last successful return as a split point.
2493 PcDesc* mid = _pc_desc_cache.last_pc_desc();
2494 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
2495 if (mid->pc_offset() < pc_offset) {
2496 lower = mid;
2497 } else {
2498 upper = mid;
2499 }
2500
2501 // Take giant steps at first (4096, then 256, then 16, then 1)
2502 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
2503 const int RADIX = (1 << LOG2_RADIX);
2504 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
2505 while ((mid = lower + step) < upper) {
2506 assert_LU_OK;
2507 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
2508 if (mid->pc_offset() < pc_offset) {
2509 lower = mid;
2510 } else {
2511 upper = mid;
2512 break;
2513 }
2514 }
2515 assert_LU_OK;
2516 }
2517
2518 // Sneak up on the value with a linear search of length ~16.
2519 while (true) {
2520 assert_LU_OK;
2521 mid = lower + 1;
2522 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
2523 if (mid->pc_offset() < pc_offset) {
2524 lower = mid;
2525 } else {
2526 upper = mid;
2527 break;
2528 }
2529 }
2530 #undef assert_LU_OK
2531
2532 if (match_desc(upper, pc_offset, approximate)) {
2533 assert(upper == linear_search(this, pc_offset, approximate), "search ok");
2534 _pc_desc_cache.add_pc_desc(upper);
2535 return upper;
2536 } else {
2537 assert(NULL == linear_search(this, pc_offset, approximate), "search ok");
2538 return NULL;
2539 }
2540 }
2541
2542
2543 void nmethod::check_all_dependencies(DepChange& changes) {
2544 // Checked dependencies are allocated into this ResourceMark
2545 ResourceMark rm;
2546
2547 // Turn off dependency tracing while actually testing dependencies.
2548 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) );
2549
2550 typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash,
2551 &DependencySignature::equals, 11027> DepTable;
2552
2553 DepTable* table = new DepTable();
2554
2555 // Iterate over live nmethods and check dependencies of all nmethods that are not
2556 // marked for deoptimization. A particular dependency is only checked once.
2557 NMethodIterator iter;
2558 while(iter.next()) {
2559 nmethod* nm = iter.method();
2560 // Only notify for live nmethods
2561 if (nm->is_alive() && !nm->is_marked_for_deoptimization()) {
2562 for (Dependencies::DepStream deps(nm); deps.next(); ) {
2563 // Construct abstraction of a dependency.
2564 DependencySignature* current_sig = new DependencySignature(deps);
2565
2566 // Determine if dependency is already checked. table->put(...) returns
2567 // 'true' if the dependency is added (i.e., was not in the hashtable).
2568 if (table->put(*current_sig, 1)) {
2569 if (deps.check_dependency() != NULL) {
2570 // Dependency checking failed. Print out information about the failed
2571 // dependency and finally fail with an assert. We can fail here, since
2572 // dependency checking is never done in a product build.
2573 tty->print_cr("Failed dependency:");
2574 changes.print();
2575 nm->print();
2576 nm->print_dependencies();
2577 assert(false, "Should have been marked for deoptimization");
2578 }
2579 }
2580 }
2581 }
2582 }
2583 }
2584
2585 bool nmethod::check_dependency_on(DepChange& changes) {
2586 // What has happened:
2587 // 1) a new class dependee has been added
2588 // 2) dependee and all its super classes have been marked
2589 bool found_check = false; // set true if we are upset
2590 for (Dependencies::DepStream deps(this); deps.next(); ) {
2591 // Evaluate only relevant dependencies.
2592 if (deps.spot_check_dependency_at(changes) != NULL) {
2593 found_check = true;
2594 NOT_DEBUG(break);
2595 }
2596 }
2597 return found_check;
2598 }
2599
2600 bool nmethod::is_evol_dependent_on(Klass* dependee) {
2601 InstanceKlass *dependee_ik = InstanceKlass::cast(dependee);
2602 Array<Method*>* dependee_methods = dependee_ik->methods();
2603 for (Dependencies::DepStream deps(this); deps.next(); ) {
2604 if (deps.type() == Dependencies::evol_method) {
2605 Method* method = deps.method_argument(0);
2606 for (int j = 0; j < dependee_methods->length(); j++) {
2607 if (dependee_methods->at(j) == method) {
2608 // RC_TRACE macro has an embedded ResourceMark
2609 RC_TRACE(0x01000000,
2610 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)",
2611 _method->method_holder()->external_name(),
2612 _method->name()->as_C_string(),
2613 _method->signature()->as_C_string(), compile_id(),
2614 method->method_holder()->external_name(),
2615 method->name()->as_C_string(),
2616 method->signature()->as_C_string()));
2617 if (TraceDependencies || LogCompilation)
2618 deps.log_dependency(dependee);
2619 return true;
2620 }
2621 }
2622 }
2623 }
2624 return false;
2625 }
2626
2627 // Called from mark_for_deoptimization, when dependee is invalidated.
2628 bool nmethod::is_dependent_on_method(Method* dependee) {
2629 for (Dependencies::DepStream deps(this); deps.next(); ) {
2630 if (deps.type() != Dependencies::evol_method)
2631 continue;
2632 Method* method = deps.method_argument(0);
2633 if (method == dependee) return true;
2634 }
2635 return false;
2636 }
2637
2638
2639 bool nmethod::is_patchable_at(address instr_addr) {
2640 assert(insts_contains(instr_addr), "wrong nmethod used");
2641 if (is_zombie()) {
2642 // a zombie may never be patched
2643 return false;
2644 }
2645 return true;
2646 }
2647
2648
2649 address nmethod::continuation_for_implicit_exception(address pc) {
2650 // Exception happened outside inline-cache check code => we are inside
2651 // an active nmethod => use cpc to determine a return address
2652 int exception_offset = pc - code_begin();
2653 int cont_offset = ImplicitExceptionTable(this).at( exception_offset );
2654 #ifdef ASSERT
2655 if (cont_offset == 0) {
2656 Thread* thread = Thread::current();
2657 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
2658 HandleMark hm(thread);
2659 ResourceMark rm(thread);
2660 CodeBlob* cb = CodeCache::find_blob(pc);
2661 assert(cb != NULL && cb == this, "");
2662 ttyLocker ttyl;
2663 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, p2i(pc));
2664 print();
2665 method()->print_codes();
2666 print_code();
2667 print_pcs();
2668 }
2669 #endif
2670 if (cont_offset == 0) {
2671 // Let the normal error handling report the exception
2672 return NULL;
2673 }
2674 return code_begin() + cont_offset;
2675 }
2676
2677
2678
2679 void nmethod_init() {
2680 // make sure you didn't forget to adjust the filler fields
2681 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
2682 }
2683
2684
2685 //-------------------------------------------------------------------------------------------
2686
2687
2688 // QQQ might we make this work from a frame??
2689 nmethodLocker::nmethodLocker(address pc) {
2690 CodeBlob* cb = CodeCache::find_blob(pc);
2691 guarantee(cb != NULL && cb->is_nmethod(), "bad pc for a nmethod found");
2692 _nm = (nmethod*)cb;
2693 lock_nmethod(_nm);
2694 }
2695
2696 // Only JvmtiDeferredEvent::compiled_method_unload_event()
2697 // should pass zombie_ok == true.
2698 void nmethodLocker::lock_nmethod(nmethod* nm, bool zombie_ok) {
2699 if (nm == NULL) return;
2700 Atomic::inc(&nm->_lock_count);
2701 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method");
2702 }
2703
2704 void nmethodLocker::unlock_nmethod(nmethod* nm) {
2705 if (nm == NULL) return;
2706 Atomic::dec(&nm->_lock_count);
2707 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock");
2708 }
2709
2710 // -----------------------------------------------------------------------------
2711 // nmethod::get_deopt_original_pc
2712 //
2713 // Return the original PC for the given PC if:
2714 // (a) the given PC belongs to a nmethod and
2715 // (b) it is a deopt PC
2716 address nmethod::get_deopt_original_pc(const frame* fr) {
2717 if (fr->cb() == NULL) return NULL;
2718
2719 nmethod* nm = fr->cb()->as_nmethod_or_null();
2720 if (nm != NULL && nm->is_deopt_pc(fr->pc()))
2721 return nm->get_original_pc(fr);
2722
2723 return NULL;
2724 }
2725
2726
2727 // -----------------------------------------------------------------------------
2728 // MethodHandle
2729
2730 bool nmethod::is_method_handle_return(address return_pc) {
2731 if (!has_method_handle_invokes()) return false;
2732 PcDesc* pd = pc_desc_at(return_pc);
2733 if (pd == NULL)
2734 return false;
2735 return pd->is_method_handle_invoke();
2736 }
2737
2738
2739 // -----------------------------------------------------------------------------
2740 // Verification
2741
2742 class VerifyOopsClosure: public OopClosure {
2743 nmethod* _nm;
2744 bool _ok;
2745 public:
2746 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
2747 bool ok() { return _ok; }
2748 virtual void do_oop(oop* p) {
2749 if ((*p) == NULL || (*p)->is_oop()) return;
2750 if (_ok) {
2751 _nm->print_nmethod(true);
2752 _ok = false;
2753 }
2754 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2755 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2756 }
2757 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2758 };
2759
2760 void nmethod::verify() {
2761
2762 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant
2763 // seems odd.
2764
2765 if (is_zombie() || is_not_entrant() || is_unloaded())
2766 return;
2767
2768 // Make sure all the entry points are correctly aligned for patching.
2769 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
2770
2771 // assert(method()->is_oop(), "must be valid");
2772
2773 ResourceMark rm;
2774
2775 if (!CodeCache::contains(this)) {
2776 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this));
2777 }
2778
2779 if(is_native_method() )
2780 return;
2781
2782 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
2783 if (nm != this) {
2784 fatal("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this));
2785 }
2786
2787 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2788 if (! p->verify(this)) {
2789 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this));
2790 }
2791 }
2792
2793 VerifyOopsClosure voc(this);
2794 oops_do(&voc);
2795 assert(voc.ok(), "embedded oops must be OK");
2796 verify_scavenge_root_oops();
2797
2798 verify_scopes();
2799 }
2800
2801
2802 void nmethod::verify_interrupt_point(address call_site) {
2803 // Verify IC only when nmethod installation is finished.
2804 bool is_installed = (method()->code() == this) // nmethod is in state 'in_use' and installed
2805 || !this->is_in_use(); // nmethod is installed, but not in 'in_use' state
2806 if (is_installed) {
2807 Thread *cur = Thread::current();
2808 if (CompiledIC_lock->owner() == cur ||
2809 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) &&
2810 SafepointSynchronize::is_at_safepoint())) {
2811 CompiledIC_at(this, call_site);
2812 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
2813 } else {
2814 MutexLocker ml_verify (CompiledIC_lock);
2815 CompiledIC_at(this, call_site);
2816 }
2817 }
2818
2819 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address());
2820 assert(pd != NULL, "PcDesc must exist");
2821 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(),
2822 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(),
2823 pd->return_oop());
2824 !sd->is_top(); sd = sd->sender()) {
2825 sd->verify();
2826 }
2827 }
2828
2829 void nmethod::verify_scopes() {
2830 if( !method() ) return; // Runtime stubs have no scope
2831 if (method()->is_native()) return; // Ignore stub methods.
2832 // iterate through all interrupt point
2833 // and verify the debug information is valid.
2834 RelocIterator iter((nmethod*)this);
2835 while (iter.next()) {
2836 address stub = NULL;
2837 switch (iter.type()) {
2838 case relocInfo::virtual_call_type:
2839 verify_interrupt_point(iter.addr());
2840 break;
2841 case relocInfo::opt_virtual_call_type:
2842 stub = iter.opt_virtual_call_reloc()->static_stub();
2843 verify_interrupt_point(iter.addr());
2844 break;
2845 case relocInfo::static_call_type:
2846 stub = iter.static_call_reloc()->static_stub();
2847 //verify_interrupt_point(iter.addr());
2848 break;
2849 case relocInfo::runtime_call_type:
2850 address destination = iter.reloc()->value();
2851 // Right now there is no way to find out which entries support
2852 // an interrupt point. It would be nice if we had this
2853 // information in a table.
2854 break;
2855 }
2856 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section");
2857 }
2858 }
2859
2860
2861 // -----------------------------------------------------------------------------
2862 // Non-product code
2863 #ifndef PRODUCT
2864
2865 class DebugScavengeRoot: public OopClosure {
2866 nmethod* _nm;
2867 bool _ok;
2868 public:
2869 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { }
2870 bool ok() { return _ok; }
2871 virtual void do_oop(oop* p) {
2872 if ((*p) == NULL || !(*p)->is_scavengable()) return;
2873 if (_ok) {
2874 _nm->print_nmethod(true);
2875 _ok = false;
2876 }
2877 tty->print_cr("*** scavengable oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2878 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2879 (*p)->print();
2880 }
2881 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2882 };
2883
2884 void nmethod::verify_scavenge_root_oops() {
2885 if (UseG1GC) {
2886 return;
2887 }
2888
2889 if (!on_scavenge_root_list()) {
2890 // Actually look inside, to verify the claim that it's clean.
2891 DebugScavengeRoot debug_scavenge_root(this);
2892 oops_do(&debug_scavenge_root);
2893 if (!debug_scavenge_root.ok())
2894 fatal("found an unadvertised bad scavengable oop in the code cache");
2895 }
2896 assert(scavenge_root_not_marked(), "");
2897 }
2898
2899 #endif // PRODUCT
2900
2901 // Printing operations
2902
2903 void nmethod::print() const {
2904 ResourceMark rm;
2905 ttyLocker ttyl; // keep the following output all in one block
2906
2907 tty->print("Compiled method ");
2908
2909 if (is_compiled_by_c1()) {
2910 tty->print("(c1) ");
2911 } else if (is_compiled_by_c2()) {
2912 tty->print("(c2) ");
2913 } else if (is_compiled_by_shark()) {
2914 tty->print("(shark) ");
2915 } else if (is_compiled_by_jvmci()) {
2916 tty->print("(JVMCI) ");
2917 } else {
2918 tty->print("(nm) ");
2919 }
2920
2921 print_on(tty, NULL);
2922
2923 if (WizardMode) {
2924 tty->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this));
2925 tty->print(" for method " INTPTR_FORMAT , p2i(method()));
2926 tty->print(" { ");
2927 tty->print_cr("%s ", state());
2928 if (on_scavenge_root_list()) tty->print("scavenge_root ");
2929 tty->print_cr("}:");
2930 }
2931 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2932 p2i(this),
2933 p2i(this) + size(),
2934 size());
2935 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2936 p2i(relocation_begin()),
2937 p2i(relocation_end()),
2938 relocation_size());
2939 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2940 p2i(consts_begin()),
2941 p2i(consts_end()),
2942 consts_size());
2943 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2944 p2i(insts_begin()),
2945 p2i(insts_end()),
2946 insts_size());
2947 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2948 p2i(stub_begin()),
2949 p2i(stub_end()),
2950 stub_size());
2951 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2952 p2i(oops_begin()),
2953 p2i(oops_end()),
2954 oops_size());
2955 if (metadata_size () > 0) tty->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2956 p2i(metadata_begin()),
2957 p2i(metadata_end()),
2958 metadata_size());
2959 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2960 p2i(scopes_data_begin()),
2961 p2i(scopes_data_end()),
2962 scopes_data_size());
2963 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2964 p2i(scopes_pcs_begin()),
2965 p2i(scopes_pcs_end()),
2966 scopes_pcs_size());
2967 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2968 p2i(dependencies_begin()),
2969 p2i(dependencies_end()),
2970 dependencies_size());
2971 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2972 p2i(handler_table_begin()),
2973 p2i(handler_table_end()),
2974 handler_table_size());
2975 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2976 p2i(nul_chk_table_begin()),
2977 p2i(nul_chk_table_end()),
2978 nul_chk_table_size());
2979 }
2980
2981 #ifndef PRODUCT
2982
2983 void nmethod::print_scopes() {
2984 // Find the first pc desc for all scopes in the code and print it.
2985 ResourceMark rm;
2986 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2987 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
2988 continue;
2989
2990 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
2991 while (sd != NULL) {
2992 sd->print_on(tty, p);
2993 sd = sd->sender();
2994 }
2995 }
2996 }
2997
2998 void nmethod::print_dependencies() {
2999 ResourceMark rm;
3000 ttyLocker ttyl; // keep the following output all in one block
3001 tty->print_cr("Dependencies:");
3002 for (Dependencies::DepStream deps(this); deps.next(); ) {
3003 deps.print_dependency();
3004 Klass* ctxk = deps.context_type();
3005 if (ctxk != NULL) {
3006 if (ctxk->is_instance_klass() && InstanceKlass::cast(ctxk)->is_dependent_nmethod(this)) {
3007 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name());
3008 }
3009 }
3010 deps.log_dependency(); // put it into the xml log also
3011 }
3012 }
3013
3014
3015 void nmethod::print_relocations() {
3016 ResourceMark m; // in case methods get printed via the debugger
3017 tty->print_cr("relocations:");
3018 RelocIterator iter(this);
3019 iter.print();
3020 if (UseRelocIndex) {
3021 jint* index_end = (jint*)relocation_end() - 1;
3022 jint index_size = *index_end;
3023 jint* index_start = (jint*)( (address)index_end - index_size );
3024 tty->print_cr(" index @" INTPTR_FORMAT ": index_size=%d", p2i(index_start), index_size);
3025 if (index_size > 0) {
3026 jint* ip;
3027 for (ip = index_start; ip+2 <= index_end; ip += 2)
3028 tty->print_cr(" (%d %d) addr=" INTPTR_FORMAT " @" INTPTR_FORMAT,
3029 ip[0],
3030 ip[1],
3031 p2i(header_end()+ip[0]),
3032 p2i(relocation_begin()-1+ip[1]));
3033 for (; ip < index_end; ip++)
3034 tty->print_cr(" (%d ?)", ip[0]);
3035 tty->print_cr(" @" INTPTR_FORMAT ": index_size=%d", p2i(ip), *ip);
3036 ip++;
3037 tty->print_cr("reloc_end @" INTPTR_FORMAT ":", p2i(ip));
3038 }
3039 }
3040 }
3041
3042
3043 void nmethod::print_pcs() {
3044 ResourceMark m; // in case methods get printed via debugger
3045 tty->print_cr("pc-bytecode offsets:");
3046 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
3047 p->print(this);
3048 }
3049 }
3050
3051 void nmethod::print_recorded_oops() {
3052 tty->print_cr("Recorded oops:");
3053 for (int i = 0; i < oops_count(); i++) {
3054 oop o = oop_at(i);
3055 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(o));
3056 if (o == (oop)Universe::non_oop_word()) {
3057 tty->print("non-oop word");
3058 } else {
3059 o->print_value();
3060 }
3061 tty->cr();
3062 }
3063 }
3064
3065 void nmethod::print_recorded_metadata() {
3066 tty->print_cr("Recorded metadata:");
3067 for (int i = 0; i < metadata_count(); i++) {
3068 Metadata* m = metadata_at(i);
3069 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(m));
3070 if (m == (Metadata*)Universe::non_oop_word()) {
3071 tty->print("non-metadata word");
3072 } else {
3073 m->print_value_on_maybe_null(tty);
3074 }
3075 tty->cr();
3076 }
3077 }
3078
3079 #endif // PRODUCT
3080
3081 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
3082 RelocIterator iter(this, begin, end);
3083 bool have_one = false;
3084 while (iter.next()) {
3085 have_one = true;
3086 switch (iter.type()) {
3087 case relocInfo::none: return "no_reloc";
3088 case relocInfo::oop_type: {
3089 stringStream st;
3090 oop_Relocation* r = iter.oop_reloc();
3091 oop obj = r->oop_value();
3092 st.print("oop(");
3093 if (obj == NULL) st.print("NULL");
3094 else obj->print_value_on(&st);
3095 st.print(")");
3096 return st.as_string();
3097 }
3098 case relocInfo::metadata_type: {
3099 stringStream st;
3100 metadata_Relocation* r = iter.metadata_reloc();
3101 Metadata* obj = r->metadata_value();
3102 st.print("metadata(");
3103 if (obj == NULL) st.print("NULL");
3104 else obj->print_value_on(&st);
3105 st.print(")");
3106 return st.as_string();
3107 }
3108 case relocInfo::runtime_call_type: {
3109 stringStream st;
3110 st.print("runtime_call");
3111 runtime_call_Relocation* r = iter.runtime_call_reloc();
3112 address dest = r->destination();
3113 CodeBlob* cb = CodeCache::find_blob(dest);
3114 if (cb != NULL) {
3115 st.print(" %s", cb->name());
3116 } else {
3117 ResourceMark rm;
3118 const int buflen = 1024;
3119 char* buf = NEW_RESOURCE_ARRAY(char, buflen);
3120 int offset;
3121 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) {
3122 st.print(" %s", buf);
3123 if (offset != 0) {
3124 st.print("+%d", offset);
3125 }
3126 }
3127 }
3128 return st.as_string();
3129 }
3130 case relocInfo::virtual_call_type: {
3131 stringStream st;
3132 st.print_raw("virtual_call");
3133 virtual_call_Relocation* r = iter.virtual_call_reloc();
3134 Method* m = r->method_value();
3135 if (m != NULL) {
3136 assert(m->is_method(), "");
3137 m->print_short_name(&st);
3138 }
3139 return st.as_string();
3140 }
3141 case relocInfo::opt_virtual_call_type: {
3142 stringStream st;
3143 st.print_raw("optimized virtual_call");
3144 opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc();
3145 Method* m = r->method_value();
3146 if (m != NULL) {
3147 assert(m->is_method(), "");
3148 m->print_short_name(&st);
3149 }
3150 return st.as_string();
3151 }
3152 case relocInfo::static_call_type: {
3153 stringStream st;
3154 st.print_raw("static_call");
3155 static_call_Relocation* r = iter.static_call_reloc();
3156 Method* m = r->method_value();
3157 if (m != NULL) {
3158 assert(m->is_method(), "");
3159 m->print_short_name(&st);
3160 }
3161 return st.as_string();
3162 }
3163 case relocInfo::static_stub_type: return "static_stub";
3164 case relocInfo::external_word_type: return "external_word";
3165 case relocInfo::internal_word_type: return "internal_word";
3166 case relocInfo::section_word_type: return "section_word";
3167 case relocInfo::poll_type: return "poll";
3168 case relocInfo::poll_return_type: return "poll_return";
3169 case relocInfo::type_mask: return "type_bit_mask";
3170 }
3171 }
3172 return have_one ? "other" : NULL;
3173 }
3174
3175 // Return a the last scope in (begin..end]
3176 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
3177 PcDesc* p = pc_desc_near(begin+1);
3178 if (p != NULL && p->real_pc(this) <= end) {
3179 return new ScopeDesc(this, p->scope_decode_offset(),
3180 p->obj_decode_offset(), p->should_reexecute(), p->rethrow_exception(),
3181 p->return_oop());
3182 }
3183 return NULL;
3184 }
3185
3186 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const {
3187 if (block_begin == entry_point()) stream->print_cr("[Entry Point]");
3188 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]");
3189 if (JVMCI_ONLY(_exception_offset >= 0 &&) block_begin == exception_begin()) stream->print_cr("[Exception Handler]");
3190 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]");
3191 if (JVMCI_ONLY(_deoptimize_offset >= 0 &&) block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]");
3192
3193 if (has_method_handle_invokes())
3194 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]");
3195
3196 if (block_begin == consts_begin()) stream->print_cr("[Constants]");
3197
3198 if (block_begin == entry_point()) {
3199 methodHandle m = method();
3200 if (m.not_null()) {
3201 stream->print(" # ");
3202 m->print_value_on(stream);
3203 stream->cr();
3204 }
3205 if (m.not_null() && !is_osr_method()) {
3206 ResourceMark rm;
3207 int sizeargs = m->size_of_parameters();
3208 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
3209 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
3210 {
3211 int sig_index = 0;
3212 if (!m->is_static())
3213 sig_bt[sig_index++] = T_OBJECT; // 'this'
3214 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) {
3215 BasicType t = ss.type();
3216 sig_bt[sig_index++] = t;
3217 if (type2size[t] == 2) {
3218 sig_bt[sig_index++] = T_VOID;
3219 } else {
3220 assert(type2size[t] == 1, "size is 1 or 2");
3221 }
3222 }
3223 assert(sig_index == sizeargs, "");
3224 }
3225 const char* spname = "sp"; // make arch-specific?
3226 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false);
3227 int stack_slot_offset = this->frame_size() * wordSize;
3228 int tab1 = 14, tab2 = 24;
3229 int sig_index = 0;
3230 int arg_index = (m->is_static() ? 0 : -1);
3231 bool did_old_sp = false;
3232 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) {
3233 bool at_this = (arg_index == -1);
3234 bool at_old_sp = false;
3235 BasicType t = (at_this ? T_OBJECT : ss.type());
3236 assert(t == sig_bt[sig_index], "sigs in sync");
3237 if (at_this)
3238 stream->print(" # this: ");
3239 else
3240 stream->print(" # parm%d: ", arg_index);
3241 stream->move_to(tab1);
3242 VMReg fst = regs[sig_index].first();
3243 VMReg snd = regs[sig_index].second();
3244 if (fst->is_reg()) {
3245 stream->print("%s", fst->name());
3246 if (snd->is_valid()) {
3247 stream->print(":%s", snd->name());
3248 }
3249 } else if (fst->is_stack()) {
3250 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
3251 if (offset == stack_slot_offset) at_old_sp = true;
3252 stream->print("[%s+0x%x]", spname, offset);
3253 } else {
3254 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
3255 }
3256 stream->print(" ");
3257 stream->move_to(tab2);
3258 stream->print("= ");
3259 if (at_this) {
3260 m->method_holder()->print_value_on(stream);
3261 } else {
3262 bool did_name = false;
3263 if (!at_this && ss.is_object()) {
3264 Symbol* name = ss.as_symbol_or_null();
3265 if (name != NULL) {
3266 name->print_value_on(stream);
3267 did_name = true;
3268 }
3269 }
3270 if (!did_name)
3271 stream->print("%s", type2name(t));
3272 }
3273 if (at_old_sp) {
3274 stream->print(" (%s of caller)", spname);
3275 did_old_sp = true;
3276 }
3277 stream->cr();
3278 sig_index += type2size[t];
3279 arg_index += 1;
3280 if (!at_this) ss.next();
3281 }
3282 if (!did_old_sp) {
3283 stream->print(" # ");
3284 stream->move_to(tab1);
3285 stream->print("[%s+0x%x]", spname, stack_slot_offset);
3286 stream->print(" (%s of caller)", spname);
3287 stream->cr();
3288 }
3289 }
3290 }
3291 }
3292
3293 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) {
3294 // First, find an oopmap in (begin, end].
3295 // We use the odd half-closed interval so that oop maps and scope descs
3296 // which are tied to the byte after a call are printed with the call itself.
3297 address base = code_begin();
3298 ImmutableOopMapSet* oms = oop_maps();
3299 if (oms != NULL) {
3300 for (int i = 0, imax = oms->count(); i < imax; i++) {
3301 const ImmutableOopMapPair* pair = oms->pair_at(i);
3302 const ImmutableOopMap* om = pair->get_from(oms);
3303 address pc = base + pair->pc_offset();
3304 if (pc > begin) {
3305 if (pc <= end) {
3306 st->move_to(column);
3307 st->print("; ");
3308 om->print_on(st);
3309 }
3310 break;
3311 }
3312 }
3313 }
3314
3315 // Print any debug info present at this pc.
3316 ScopeDesc* sd = scope_desc_in(begin, end);
3317 if (sd != NULL) {
3318 st->move_to(column);
3319 if (sd->bci() == SynchronizationEntryBCI) {
3320 st->print(";*synchronization entry");
3321 } else {
3322 if (sd->method() == NULL) {
3323 st->print("method is NULL");
3324 } else if (sd->method()->is_native()) {
3325 st->print("method is native");
3326 } else {
3327 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci());
3328 st->print(";*%s", Bytecodes::name(bc));
3329 switch (bc) {
3330 case Bytecodes::_invokevirtual:
3331 case Bytecodes::_invokespecial:
3332 case Bytecodes::_invokestatic:
3333 case Bytecodes::_invokeinterface:
3334 {
3335 Bytecode_invoke invoke(sd->method(), sd->bci());
3336 st->print(" ");
3337 if (invoke.name() != NULL)
3338 invoke.name()->print_symbol_on(st);
3339 else
3340 st->print("<UNKNOWN>");
3341 break;
3342 }
3343 case Bytecodes::_getfield:
3344 case Bytecodes::_putfield:
3345 case Bytecodes::_getstatic:
3346 case Bytecodes::_putstatic:
3347 {
3348 Bytecode_field field(sd->method(), sd->bci());
3349 st->print(" ");
3350 if (field.name() != NULL)
3351 field.name()->print_symbol_on(st);
3352 else
3353 st->print("<UNKNOWN>");
3354 }
3355 }
3356 }
3357 st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop());
3358 }
3359
3360 // Print all scopes
3361 for (;sd != NULL; sd = sd->sender()) {
3362 st->move_to(column);
3363 st->print("; -");
3364 if (sd->method() == NULL) {
3365 st->print("method is NULL");
3366 } else {
3367 sd->method()->print_short_name(st);
3368 }
3369 int lineno = sd->method()->line_number_from_bci(sd->bci());
3370 if (lineno != -1) {
3371 st->print("@%d (line %d)", sd->bci(), lineno);
3372 } else {
3373 st->print("@%d", sd->bci());
3374 }
3375 st->cr();
3376 }
3377 }
3378
3379 // Print relocation information
3380 const char* str = reloc_string_for(begin, end);
3381 if (str != NULL) {
3382 if (sd != NULL) st->cr();
3383 st->move_to(column);
3384 st->print("; {%s}", str);
3385 }
3386 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin());
3387 if (cont_offset != 0) {
3388 st->move_to(column);
3389 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset));
3390 }
3391
3392 }
3393
3394 #ifndef PRODUCT
3395
3396 void nmethod::print_value_on(outputStream* st) const {
3397 st->print("nmethod");
3398 print_on(st, NULL);
3399 }
3400
3401 void nmethod::print_calls(outputStream* st) {
3402 RelocIterator iter(this);
3403 while (iter.next()) {
3404 switch (iter.type()) {
3405 case relocInfo::virtual_call_type:
3406 case relocInfo::opt_virtual_call_type: {
3407 VerifyMutexLocker mc(CompiledIC_lock);
3408 CompiledIC_at(&iter)->print();
3409 break;
3410 }
3411 case relocInfo::static_call_type:
3412 st->print_cr("Static call at " INTPTR_FORMAT, p2i(iter.reloc()->addr()));
3413 compiledStaticCall_at(iter.reloc())->print();
3414 break;
3415 }
3416 }
3417 }
3418
3419 void nmethod::print_handler_table() {
3420 ExceptionHandlerTable(this).print();
3421 }
3422
3423 void nmethod::print_nul_chk_table() {
3424 ImplicitExceptionTable(this).print(code_begin());
3425 }
3426
3427 void nmethod::print_statistics() {
3428 ttyLocker ttyl;
3429 if (xtty != NULL) xtty->head("statistics type='nmethod'");
3430 native_nmethod_stats.print_native_nmethod_stats();
3431 #ifdef COMPILER1
3432 c1_java_nmethod_stats.print_nmethod_stats("C1");
3433 #endif
3434 #ifdef COMPILER2
3435 c2_java_nmethod_stats.print_nmethod_stats("C2");
3436 #endif
3437 #if INCLUDE_JVMCI
3438 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI");
3439 #endif
3440 #ifdef SHARK
3441 shark_java_nmethod_stats.print_nmethod_stats("Shark");
3442 #endif
3443 unknown_java_nmethod_stats.print_nmethod_stats("Unknown");
3444 DebugInformationRecorder::print_statistics();
3445 #ifndef PRODUCT
3446 pc_nmethod_stats.print_pc_stats();
3447 #endif
3448 Dependencies::print_statistics();
3449 if (xtty != NULL) xtty->tail("statistics");
3450 }
3451
3452 #endif // !PRODUCT
3453
3454 #if INCLUDE_JVMCI
3455 void nmethod::clear_jvmci_installed_code() {
3456 // write_ref_method_pre/post can only be safely called at a
3457 // safepoint or while holding the CodeCache_lock
3458 assert(CodeCache_lock->is_locked() ||
3459 SafepointSynchronize::is_at_safepoint(), "should be performed under a lock for consistency");
3460 if (_jvmci_installed_code != NULL) {
3461 // This must be done carefully to maintain nmethod remembered sets properly
3462 BarrierSet* bs = Universe::heap()->barrier_set();
3463 bs->write_ref_nmethod_pre(&_jvmci_installed_code, this);
3464 _jvmci_installed_code = NULL;
3465 bs->write_ref_nmethod_post(&_jvmci_installed_code, this);
3466 }
3467 }
3468
3469 void nmethod::maybe_invalidate_installed_code() {
3470 assert(Patching_lock->is_locked() ||
3471 SafepointSynchronize::is_at_safepoint(), "should be performed under a lock for consistency");
3472 oop installed_code = jvmci_installed_code();
3473 if (installed_code != NULL) {
3474 nmethod* nm = (nmethod*)InstalledCode::address(installed_code);
3475 if (nm == NULL || nm != this) {
3476 // The link has been broken or the InstalledCode instance is
3477 // associated with another nmethod so do nothing.
3478 return;
3479 }
3480 if (!is_alive()) {
3481 // Break the link between nmethod and InstalledCode such that the nmethod
3482 // can subsequently be flushed safely. The link must be maintained while
3483 // the method could have live activations since invalidateInstalledCode
3484 // might want to invalidate all existing activations.
3485 InstalledCode::set_address(installed_code, 0);
3486 InstalledCode::set_entryPoint(installed_code, 0);
3487 } else if (is_not_entrant()) {
3488 // Remove the entry point so any invocation will fail but keep
3489 // the address link around that so that existing activations can
3490 // be invalidated.
3491 InstalledCode::set_entryPoint(installed_code, 0);
3492 }
3493 }
3494 }
3495
3496 void nmethod::invalidate_installed_code(Handle installedCode, TRAPS) {
3497 if (installedCode() == NULL) {
3498 THROW(vmSymbols::java_lang_NullPointerException());
3499 }
3500 jlong nativeMethod = InstalledCode::address(installedCode);
3501 nmethod* nm = (nmethod*)nativeMethod;
3502 if (nm == NULL) {
3503 // Nothing to do
3504 return;
3505 }
3506
3507 nmethodLocker nml(nm);
3508 #ifdef ASSERT
3509 {
3510 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
3511 // This relationship can only be checked safely under a lock
3512 assert(nm == NULL || !nm->is_alive() || nm->jvmci_installed_code() == installedCode(), "sanity check");
3513 }
3514 #endif
3515
3516 if (nm->is_alive()) {
3517 // The nmethod state machinery maintains the link between the
3518 // HotSpotInstalledCode and nmethod* so as long as the nmethod appears to be
3519 // alive assume there is work to do and deoptimize the nmethod.
3520 nm->mark_for_deoptimization();
3521 VM_Deoptimize op;
3522 VMThread::execute(&op);
3523 }
3524
3525 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
3526 // Check that it's still associated with the same nmethod and break
3527 // the link if it is.
3528 if (InstalledCode::address(installedCode) == nativeMethod) {
3529 InstalledCode::set_address(installedCode, 0);
3530 }
3531 }
3532
3533 char* nmethod::jvmci_installed_code_name(char* buf, size_t buflen) {
3534 if (!this->is_compiled_by_jvmci()) {
3535 return NULL;
3536 }
3537 oop installedCode = this->jvmci_installed_code();
3538 if (installedCode != NULL) {
3539 oop installedCodeName = NULL;
3540 if (installedCode->is_a(InstalledCode::klass())) {
3541 installedCodeName = InstalledCode::name(installedCode);
3542 }
3543 if (installedCodeName != NULL) {
3544 return java_lang_String::as_utf8_string(installedCodeName, buf, (int)buflen);
3545 } else {
3546 jio_snprintf(buf, buflen, "null");
3547 return buf;
3548 }
3549 }
3550 jio_snprintf(buf, buflen, "noInstalledCode");
3551 return buf;
3552 }
3553 #endif
3554
3555 Method* nmethod::attached_method(address call_instr) {
3556 assert(code_contains(call_instr), "not part of the nmethod");
3557 RelocIterator iter(this, call_instr, call_instr + 1);
3558 while (iter.next()) {
3559 if (iter.addr() == call_instr) {
3560 switch(iter.type()) {
3561 case relocInfo::static_call_type: return iter.static_call_reloc()->method_value();
3562 case relocInfo::opt_virtual_call_type: return iter.opt_virtual_call_reloc()->method_value();
3563 case relocInfo::virtual_call_type: return iter.virtual_call_reloc()->method_value();
3564 }
3565 }
3566 }
3567 return NULL; // not found
3568 }
3569
3570 Method* nmethod::attached_method_before_pc(address pc) {
3571 if (NativeCall::is_call_before(pc)) {
3572 NativeCall* ncall = nativeCall_before(pc);
3573 return attached_method(ncall->instruction_address());
3574 }
3575 return NULL; // not a call
3576 }
3577