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