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