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