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 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
73
74 unsigned char nmethod::_global_unloading_clock = 0;
75
76 #ifdef DTRACE_ENABLED
77
78 // Only bother with this argument setup if dtrace is available
79
80 #define DTRACE_METHOD_UNLOAD_PROBE(method) \
81 { \
82 Method* m = (method); \
83 if (m != NULL) { \
84 Symbol* klass_name = m->klass_name(); \
85 Symbol* name = m->name(); \
86 Symbol* signature = m->signature(); \
87 HOTSPOT_COMPILED_METHOD_UNLOAD( \
88 (char *) klass_name->bytes(), klass_name->utf8_length(), \
89 (char *) name->bytes(), name->utf8_length(), \
90 (char *) signature->bytes(), signature->utf8_length()); \
91 } \
92 }
93
94 #else // ndef DTRACE_ENABLED
95
96 #define DTRACE_METHOD_UNLOAD_PROBE(method)
97
98 #endif
99
100 bool nmethod::is_compiled_by_c1() const {
101 if (compiler() == NULL) {
102 return false;
103 }
104 return compiler()->is_c1();
105 }
106 bool nmethod::is_compiled_by_jvmci() const {
107 if (compiler() == NULL || method() == NULL) return false; // can happen during debug printing
108 if (is_native_method()) return false;
109 return compiler()->is_jvmci();
110 }
111 bool nmethod::is_compiled_by_c2() const {
112 if (compiler() == NULL) {
113 return false;
114 }
115 return compiler()->is_c2();
116 }
117 bool nmethod::is_compiled_by_shark() const {
118 if (compiler() == NULL) {
119 return false;
120 }
121 return compiler()->is_shark();
122 }
123
124
125
126 //---------------------------------------------------------------------------------
127 // NMethod statistics
128 // They are printed under various flags, including:
129 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation.
130 // (In the latter two cases, they like other stats are printed to the log only.)
131
132 #ifndef PRODUCT
133 // These variables are put into one block to reduce relocations
134 // and make it simpler to print from the debugger.
135 struct java_nmethod_stats_struct {
136 int nmethod_count;
137 int total_size;
138 int relocation_size;
139 int consts_size;
140 int insts_size;
141 int stub_size;
142 int scopes_data_size;
143 int scopes_pcs_size;
144 int dependencies_size;
145 int handler_table_size;
146 int nul_chk_table_size;
147 int oops_size;
148 int metadata_size;
149
150 void note_nmethod(nmethod* nm) {
151 nmethod_count += 1;
152 total_size += nm->size();
153 relocation_size += nm->relocation_size();
154 consts_size += nm->consts_size();
155 insts_size += nm->insts_size();
156 stub_size += nm->stub_size();
157 oops_size += nm->oops_size();
158 metadata_size += nm->metadata_size();
159 scopes_data_size += nm->scopes_data_size();
160 scopes_pcs_size += nm->scopes_pcs_size();
161 dependencies_size += nm->dependencies_size();
162 handler_table_size += nm->handler_table_size();
163 nul_chk_table_size += nm->nul_chk_table_size();
164 }
165 void print_nmethod_stats(const char* name) {
166 if (nmethod_count == 0) return;
167 tty->print_cr("Statistics for %d bytecoded nmethods for %s:", nmethod_count, name);
168 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size);
169 if (nmethod_count != 0) tty->print_cr(" header = %d", nmethod_count * sizeof(nmethod));
170 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size);
171 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size);
172 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size);
173 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size);
174 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size);
175 if (metadata_size != 0) tty->print_cr(" metadata = %d", metadata_size);
176 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size);
177 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size);
178 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size);
179 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size);
180 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size);
181 }
182 };
183
184 struct native_nmethod_stats_struct {
185 int native_nmethod_count;
186 int native_total_size;
187 int native_relocation_size;
188 int native_insts_size;
189 int native_oops_size;
190 int native_metadata_size;
191 void note_native_nmethod(nmethod* nm) {
192 native_nmethod_count += 1;
193 native_total_size += nm->size();
194 native_relocation_size += nm->relocation_size();
195 native_insts_size += nm->insts_size();
196 native_oops_size += nm->oops_size();
197 native_metadata_size += nm->metadata_size();
198 }
199 void print_native_nmethod_stats() {
200 if (native_nmethod_count == 0) return;
201 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count);
202 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size);
203 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size);
204 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size);
205 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size);
206 if (native_metadata_size != 0) tty->print_cr(" N. metadata = %d", native_metadata_size);
207 }
208 };
209
210 struct pc_nmethod_stats_struct {
211 int pc_desc_resets; // number of resets (= number of caches)
212 int pc_desc_queries; // queries to nmethod::find_pc_desc
213 int pc_desc_approx; // number of those which have approximate true
214 int pc_desc_repeats; // number of _pc_descs[0] hits
215 int pc_desc_hits; // number of LRU cache hits
216 int pc_desc_tests; // total number of PcDesc examinations
217 int pc_desc_searches; // total number of quasi-binary search steps
218 int pc_desc_adds; // number of LUR cache insertions
219
220 void print_pc_stats() {
221 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query",
222 pc_desc_queries,
223 (double)(pc_desc_tests + pc_desc_searches)
224 / pc_desc_queries);
225 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d",
226 pc_desc_resets,
227 pc_desc_queries, pc_desc_approx,
228 pc_desc_repeats, pc_desc_hits,
229 pc_desc_tests, pc_desc_searches, pc_desc_adds);
230 }
231 };
232
233 #ifdef COMPILER1
234 static java_nmethod_stats_struct c1_java_nmethod_stats;
235 #endif
236 #ifdef COMPILER2
237 static java_nmethod_stats_struct c2_java_nmethod_stats;
238 #endif
239 #if INCLUDE_JVMCI
240 static java_nmethod_stats_struct jvmci_java_nmethod_stats;
241 #endif
242 #ifdef SHARK
243 static java_nmethod_stats_struct shark_java_nmethod_stats;
244 #endif
245 static java_nmethod_stats_struct unknown_java_nmethod_stats;
246
247 static native_nmethod_stats_struct native_nmethod_stats;
248 static pc_nmethod_stats_struct pc_nmethod_stats;
249
250 static void note_java_nmethod(nmethod* nm) {
251 #ifdef COMPILER1
252 if (nm->is_compiled_by_c1()) {
253 c1_java_nmethod_stats.note_nmethod(nm);
254 } else
255 #endif
256 #ifdef COMPILER2
257 if (nm->is_compiled_by_c2()) {
258 c2_java_nmethod_stats.note_nmethod(nm);
259 } else
260 #endif
261 #if INCLUDE_JVMCI
262 if (nm->is_compiled_by_jvmci()) {
263 jvmci_java_nmethod_stats.note_nmethod(nm);
264 } else
265 #endif
266 #ifdef SHARK
267 if (nm->is_compiled_by_shark()) {
268 shark_java_nmethod_stats.note_nmethod(nm);
269 } else
270 #endif
271 {
272 unknown_java_nmethod_stats.note_nmethod(nm);
273 }
274 }
275 #endif // !PRODUCT
276
277 //---------------------------------------------------------------------------------
278
279
280 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) {
281 assert(pc != NULL, "Must be non null");
282 assert(exception.not_null(), "Must be non null");
283 assert(handler != NULL, "Must be non null");
284
285 _count = 0;
286 _exception_type = exception->klass();
287 _next = NULL;
288
289 add_address_and_handler(pc,handler);
290 }
291
292
293 address ExceptionCache::match(Handle exception, address pc) {
294 assert(pc != NULL,"Must be non null");
295 assert(exception.not_null(),"Must be non null");
296 if (exception->klass() == exception_type()) {
297 return (test_address(pc));
298 }
299
300 return NULL;
301 }
302
303
304 bool ExceptionCache::match_exception_with_space(Handle exception) {
305 assert(exception.not_null(),"Must be non null");
306 if (exception->klass() == exception_type() && count() < cache_size) {
307 return true;
308 }
309 return false;
310 }
311
312
313 address ExceptionCache::test_address(address addr) {
314 for (int i=0; i<count(); i++) {
315 if (pc_at(i) == addr) {
316 return handler_at(i);
317 }
318 }
319 return NULL;
320 }
321
322
323 bool ExceptionCache::add_address_and_handler(address addr, address handler) {
324 if (test_address(addr) == handler) return true;
325 if (count() < cache_size) {
326 set_pc_at(count(),addr);
327 set_handler_at(count(), handler);
328 increment_count();
329 return true;
330 }
331 return false;
332 }
333
334
335 // private method for handling exception cache
336 // These methods are private, and used to manipulate the exception cache
337 // directly.
338 ExceptionCache* nmethod::exception_cache_entry_for_exception(Handle exception) {
339 ExceptionCache* ec = exception_cache();
340 while (ec != NULL) {
341 if (ec->match_exception_with_space(exception)) {
342 return ec;
343 }
344 ec = ec->next();
345 }
346 return NULL;
347 }
348
349
350 //-----------------------------------------------------------------------------
351
352
353 // Helper used by both find_pc_desc methods.
354 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) {
355 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_tests);
356 if (!approximate)
357 return pc->pc_offset() == pc_offset;
358 else
359 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset();
360 }
361
362 void PcDescCache::reset_to(PcDesc* initial_pc_desc) {
363 if (initial_pc_desc == NULL) {
364 _pc_descs[0] = NULL; // native method; no PcDescs at all
365 return;
366 }
367 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_resets);
368 // reset the cache by filling it with benign (non-null) values
369 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel");
370 for (int i = 0; i < cache_size; i++)
371 _pc_descs[i] = initial_pc_desc;
372 }
373
374 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) {
375 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_queries);
376 NOT_PRODUCT(if (approximate) ++pc_nmethod_stats.pc_desc_approx);
377
378 // Note: one might think that caching the most recently
379 // read value separately would be a win, but one would be
380 // wrong. When many threads are updating it, the cache
381 // line it's in would bounce between caches, negating
382 // any benefit.
383
384 // In order to prevent race conditions do not load cache elements
385 // repeatedly, but use a local copy:
386 PcDesc* res;
387
388 // Step one: Check the most recently added value.
389 res = _pc_descs[0];
390 if (res == NULL) return NULL; // native method; no PcDescs at all
391 if (match_desc(res, pc_offset, approximate)) {
392 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_repeats);
393 return res;
394 }
395
396 // Step two: Check the rest of the LRU cache.
397 for (int i = 1; i < cache_size; ++i) {
398 res = _pc_descs[i];
399 if (res->pc_offset() < 0) break; // optimization: skip empty cache
400 if (match_desc(res, pc_offset, approximate)) {
401 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_hits);
402 return res;
403 }
404 }
405
406 // Report failure.
407 return NULL;
408 }
409
410 void PcDescCache::add_pc_desc(PcDesc* pc_desc) {
411 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_adds);
412 // Update the LRU cache by shifting pc_desc forward.
413 for (int i = 0; i < cache_size; i++) {
414 PcDesc* next = _pc_descs[i];
415 _pc_descs[i] = pc_desc;
416 pc_desc = next;
417 }
418 }
419
420 // adjust pcs_size so that it is a multiple of both oopSize and
421 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple
422 // of oopSize, then 2*sizeof(PcDesc) is)
423 static int adjust_pcs_size(int pcs_size) {
424 int nsize = round_to(pcs_size, oopSize);
425 if ((nsize % sizeof(PcDesc)) != 0) {
426 nsize = pcs_size + sizeof(PcDesc);
427 }
428 assert((nsize % oopSize) == 0, "correct alignment");
429 return nsize;
430 }
431
432 //-----------------------------------------------------------------------------
433
434
435 void nmethod::add_exception_cache_entry(ExceptionCache* new_entry) {
436 assert(ExceptionCache_lock->owned_by_self(),"Must hold the ExceptionCache_lock");
437 assert(new_entry != NULL,"Must be non null");
438 assert(new_entry->next() == NULL, "Must be null");
439
440 if (exception_cache() != NULL) {
441 new_entry->set_next(exception_cache());
442 }
443 set_exception_cache(new_entry);
444 }
445
446 void nmethod::clean_exception_cache(BoolObjectClosure* is_alive) {
447 ExceptionCache* prev = NULL;
448 ExceptionCache* curr = exception_cache();
449
450 while (curr != NULL) {
451 ExceptionCache* next = curr->next();
452
453 Klass* ex_klass = curr->exception_type();
454 if (ex_klass != NULL && !ex_klass->is_loader_alive(is_alive)) {
455 if (prev == NULL) {
456 set_exception_cache(next);
457 } else {
458 prev->set_next(next);
459 }
460 delete curr;
461 // prev stays the same.
462 } else {
463 prev = curr;
464 }
465
466 curr = next;
467 }
468 }
469
470 // public method for accessing the exception cache
471 // These are the public access methods.
472 address nmethod::handler_for_exception_and_pc(Handle exception, address pc) {
473 // We never grab a lock to read the exception cache, so we may
474 // have false negatives. This is okay, as it can only happen during
475 // the first few exception lookups for a given nmethod.
476 ExceptionCache* ec = exception_cache();
477 while (ec != NULL) {
478 address ret_val;
479 if ((ret_val = ec->match(exception,pc)) != NULL) {
480 return ret_val;
481 }
482 ec = ec->next();
483 }
484 return NULL;
485 }
486
487
488 void nmethod::add_handler_for_exception_and_pc(Handle exception, address pc, address handler) {
489 // There are potential race conditions during exception cache updates, so we
490 // must own the ExceptionCache_lock before doing ANY modifications. Because
491 // we don't lock during reads, it is possible to have several threads attempt
492 // to update the cache with the same data. We need to check for already inserted
493 // copies of the current data before adding it.
494
495 MutexLocker ml(ExceptionCache_lock);
496 ExceptionCache* target_entry = exception_cache_entry_for_exception(exception);
497
498 if (target_entry == NULL || !target_entry->add_address_and_handler(pc,handler)) {
499 target_entry = new ExceptionCache(exception,pc,handler);
500 add_exception_cache_entry(target_entry);
501 }
502 }
503
504
505 //-------------end of code for ExceptionCache--------------
506
507
508 int nmethod::total_size() const {
509 return
510 consts_size() +
511 insts_size() +
512 stub_size() +
513 scopes_data_size() +
514 scopes_pcs_size() +
515 handler_table_size() +
516 nul_chk_table_size();
517 }
518
519 const char* nmethod::compile_kind() const {
520 if (is_osr_method()) return "osr";
521 if (method() != NULL && is_native_method()) return "c2n";
522 return NULL;
523 }
524
525 // Fill in default values for various flag fields
526 void nmethod::init_defaults() {
527 _state = in_use;
528 _unloading_clock = 0;
529 _marked_for_reclamation = 0;
530 _has_flushed_dependencies = 0;
531 _has_unsafe_access = 0;
532 _has_method_handle_invokes = 0;
533 _lazy_critical_native = 0;
534 _has_wide_vectors = 0;
535 _marked_for_deoptimization = 0;
536 _lock_count = 0;
537 _stack_traversal_mark = 0;
538 _unload_reported = false; // jvmti state
539
540 #ifdef ASSERT
541 _oops_are_stale = false;
542 #endif
543
544 _oops_do_mark_link = NULL;
545 _jmethod_id = NULL;
546 _osr_link = NULL;
547 if (UseG1GC) {
548 _unloading_next = NULL;
549 } else {
550 _scavenge_root_link = NULL;
551 }
552 _scavenge_root_state = 0;
553 _compiler = NULL;
554 #if INCLUDE_RTM_OPT
555 _rtm_state = NoRTM;
556 #endif
557 #if INCLUDE_JVMCI
558 _jvmci_installed_code = NULL;
559 _speculation_log = NULL;
560 #endif
561 }
562
563 nmethod* nmethod::new_native_nmethod(methodHandle method,
564 int compile_id,
565 CodeBuffer *code_buffer,
566 int vep_offset,
567 int frame_complete,
568 int frame_size,
569 ByteSize basic_lock_owner_sp_offset,
570 ByteSize basic_lock_sp_offset,
571 OopMapSet* oop_maps) {
572 code_buffer->finalize_oop_references(method);
573 // create nmethod
574 nmethod* nm = NULL;
575 {
576 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
577 int native_nmethod_size = allocation_size(code_buffer, sizeof(nmethod));
578 CodeOffsets offsets;
579 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
580 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
581 nm = new (native_nmethod_size, CompLevel_none) nmethod(method(), native_nmethod_size,
582 compile_id, &offsets,
583 code_buffer, frame_size,
584 basic_lock_owner_sp_offset,
585 basic_lock_sp_offset, oop_maps);
586 NOT_PRODUCT(if (nm != NULL) native_nmethod_stats.note_native_nmethod(nm));
587 if ((PrintAssembly || CompilerOracle::should_print(method)) && nm != NULL) {
588 Disassembler::decode(nm);
589 }
590 }
591 // verify nmethod
592 debug_only(if (nm) nm->verify();) // might block
593
594 if (nm != NULL) {
595 nm->log_new_nmethod();
596 }
597
598 return nm;
599 }
600
601 nmethod* nmethod::new_nmethod(methodHandle method,
602 int compile_id,
603 int entry_bci,
604 CodeOffsets* offsets,
605 int orig_pc_offset,
606 DebugInformationRecorder* debug_info,
607 Dependencies* dependencies,
608 CodeBuffer* code_buffer, int frame_size,
609 OopMapSet* oop_maps,
610 ExceptionHandlerTable* handler_table,
611 ImplicitExceptionTable* nul_chk_table,
612 AbstractCompiler* compiler,
613 int comp_level
614 #if INCLUDE_JVMCI
615 , Handle installed_code,
616 Handle speculationLog
617 #endif
618 )
619 {
620 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
621 code_buffer->finalize_oop_references(method);
622 // create nmethod
623 nmethod* nm = NULL;
624 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
625 int nmethod_size =
626 allocation_size(code_buffer, sizeof(nmethod))
627 + adjust_pcs_size(debug_info->pcs_size())
628 + round_to(dependencies->size_in_bytes() , oopSize)
629 + round_to(handler_table->size_in_bytes(), oopSize)
630 + round_to(nul_chk_table->size_in_bytes(), oopSize)
631 + round_to(debug_info->data_size() , oopSize);
632
633 nm = new (nmethod_size, comp_level)
634 nmethod(method(), nmethod_size, compile_id, entry_bci, offsets,
635 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size,
636 oop_maps,
637 handler_table,
638 nul_chk_table,
639 compiler,
640 comp_level
641 #if INCLUDE_JVMCI
642 , installed_code,
643 speculationLog
644 #endif
645 );
646
647 if (nm != NULL) {
648 // To make dependency checking during class loading fast, record
649 // the nmethod dependencies in the classes it is dependent on.
650 // This allows the dependency checking code to simply walk the
651 // class hierarchy above the loaded class, checking only nmethods
652 // which are dependent on those classes. The slow way is to
653 // check every nmethod for dependencies which makes it linear in
654 // the number of methods compiled. For applications with a lot
655 // classes the slow way is too slow.
656 for (Dependencies::DepStream deps(nm); deps.next(); ) {
657 if (deps.type() == Dependencies::call_site_target_value) {
658 // CallSite dependencies are managed on per-CallSite instance basis.
659 oop call_site = deps.argument_oop(0);
660 MethodHandles::add_dependent_nmethod(call_site, nm);
661 } else {
662 Klass* klass = deps.context_type();
663 if (klass == NULL) {
664 continue; // ignore things like evol_method
665 }
666 // record this nmethod as dependent on this klass
667 InstanceKlass::cast(klass)->add_dependent_nmethod(nm);
668 }
669 }
670 NOT_PRODUCT(if (nm != NULL) note_java_nmethod(nm));
671 if (PrintAssembly || CompilerOracle::has_option_string(method, "PrintAssembly")) {
672 Disassembler::decode(nm);
673 }
674 }
675 }
676 // Do verification and logging outside CodeCache_lock.
677 if (nm != NULL) {
678 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
679 DEBUG_ONLY(nm->verify();)
680 nm->log_new_nmethod();
681 }
682 return nm;
683 }
684
685 #ifdef _MSC_VER
686 #pragma warning(push)
687 #pragma warning(disable:4355) // warning C4355: 'this' : used in base member initializer list
688 #endif
689 // For native wrappers
690 nmethod::nmethod(
691 Method* method,
692 int nmethod_size,
693 int compile_id,
694 CodeOffsets* offsets,
695 CodeBuffer* code_buffer,
696 int frame_size,
697 ByteSize basic_lock_owner_sp_offset,
698 ByteSize basic_lock_sp_offset,
699 OopMapSet* oop_maps )
700 : CodeBlob("native nmethod", code_buffer, sizeof(nmethod),
701 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps),
702 _native_receiver_sp_offset(basic_lock_owner_sp_offset),
703 _native_basic_lock_sp_offset(basic_lock_sp_offset)
704 {
705 {
706 debug_only(No_Safepoint_Verifier nsv;)
707 assert_locked_or_safepoint(CodeCache_lock);
708
709 init_defaults();
710 _method = method;
711 _entry_bci = InvocationEntryBci;
712 // We have no exception handler or deopt handler make the
713 // values something that will never match a pc like the nmethod vtable entry
714 _exception_offset = 0;
715 _deoptimize_offset = 0;
716 _deoptimize_mh_offset = 0;
717 _orig_pc_offset = 0;
718
719 _consts_offset = data_offset();
720 _stub_offset = data_offset();
721 _oops_offset = data_offset();
722 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize);
723 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize);
724 _scopes_pcs_offset = _scopes_data_offset;
725 _dependencies_offset = _scopes_pcs_offset;
726 _handler_table_offset = _dependencies_offset;
727 _nul_chk_table_offset = _handler_table_offset;
728 _nmethod_end_offset = _nul_chk_table_offset;
729 _compile_id = compile_id;
730 _comp_level = CompLevel_none;
731 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
732 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
733 _osr_entry_point = NULL;
734 _exception_cache = NULL;
735 _pc_desc_cache.reset_to(NULL);
736 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
737
738 code_buffer->copy_values_to(this);
739 if (ScavengeRootsInCode) {
740 if (detect_scavenge_root_oops()) {
741 CodeCache::add_scavenge_root_nmethod(this);
742 }
743 Universe::heap()->register_nmethod(this);
744 }
745 debug_only(verify_scavenge_root_oops());
746 CodeCache::commit(this);
747 }
748
749 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
750 ttyLocker ttyl; // keep the following output all in one block
751 // This output goes directly to the tty, not the compiler log.
752 // To enable tools to match it up with the compilation activity,
753 // be sure to tag this tty output with the compile ID.
754 if (xtty != NULL) {
755 xtty->begin_head("print_native_nmethod");
756 xtty->method(_method);
757 xtty->stamp();
758 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
759 }
760 // print the header part first
761 print();
762 // then print the requested information
763 if (PrintNativeNMethods) {
764 print_code();
765 if (oop_maps != NULL) {
766 oop_maps->print();
767 }
768 }
769 if (PrintRelocations) {
770 print_relocations();
771 }
772 if (xtty != NULL) {
773 xtty->tail("print_native_nmethod");
774 }
775 }
776 }
777
778 #ifdef _MSC_VER
779 #pragma warning(pop)
780 #endif
781
782 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () {
783 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level));
784 }
785
786 nmethod::nmethod(
787 Method* method,
788 int nmethod_size,
789 int compile_id,
790 int entry_bci,
791 CodeOffsets* offsets,
792 int orig_pc_offset,
793 DebugInformationRecorder* debug_info,
794 Dependencies* dependencies,
795 CodeBuffer *code_buffer,
796 int frame_size,
797 OopMapSet* oop_maps,
798 ExceptionHandlerTable* handler_table,
799 ImplicitExceptionTable* nul_chk_table,
800 AbstractCompiler* compiler,
801 int comp_level
802 #if INCLUDE_JVMCI
803 , Handle installed_code,
804 Handle speculation_log
805 #endif
806 )
807 : CodeBlob("nmethod", code_buffer, sizeof(nmethod),
808 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps),
809 _native_receiver_sp_offset(in_ByteSize(-1)),
810 _native_basic_lock_sp_offset(in_ByteSize(-1))
811 {
812 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
813 {
814 debug_only(No_Safepoint_Verifier nsv;)
815 assert_locked_or_safepoint(CodeCache_lock);
816
817 init_defaults();
818 _method = method;
819 _entry_bci = entry_bci;
820 _compile_id = compile_id;
821 _comp_level = comp_level;
822 _compiler = compiler;
823 _orig_pc_offset = orig_pc_offset;
824 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
825
826 // Section offsets
827 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts());
828 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs());
829
830 #if INCLUDE_JVMCI
831 _jvmci_installed_code = installed_code();
832 _speculation_log = (instanceOop)speculation_log();
833
834 if (compiler->is_jvmci()) {
835 // JVMCI might not produce any stub sections
836 if (offsets->value(CodeOffsets::Exceptions) != -1) {
837 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions);
838 } else {
839 _exception_offset = -1;
840 }
841 if (offsets->value(CodeOffsets::Deopt) != -1) {
842 _deoptimize_offset = code_offset() + offsets->value(CodeOffsets::Deopt);
843 } else {
844 _deoptimize_offset = -1;
845 }
846 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
847 _deoptimize_mh_offset = code_offset() + offsets->value(CodeOffsets::DeoptMH);
848 } else {
849 _deoptimize_mh_offset = -1;
850 }
851 } else {
852 #endif
853 // Exception handler and deopt handler are in the stub section
854 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set");
855 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set");
856
857 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
858 _deoptimize_offset = _stub_offset + offsets->value(CodeOffsets::Deopt);
859 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
860 _deoptimize_mh_offset = _stub_offset + offsets->value(CodeOffsets::DeoptMH);
861 } else {
862 _deoptimize_mh_offset = -1;
863 #if INCLUDE_JVMCI
864 }
865 #endif
866 }
867 if (offsets->value(CodeOffsets::UnwindHandler) != -1) {
868 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler);
869 } else {
870 _unwind_handler_offset = -1;
871 }
872
873 _oops_offset = data_offset();
874 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize);
875 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize);
876
877 _scopes_pcs_offset = _scopes_data_offset + round_to(debug_info->data_size (), oopSize);
878 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
879 _handler_table_offset = _dependencies_offset + round_to(dependencies->size_in_bytes (), oopSize);
880 _nul_chk_table_offset = _handler_table_offset + round_to(handler_table->size_in_bytes(), oopSize);
881 _nmethod_end_offset = _nul_chk_table_offset + round_to(nul_chk_table->size_in_bytes(), oopSize);
882
883 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
884 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
885 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry);
886 _exception_cache = NULL;
887 _pc_desc_cache.reset_to(scopes_pcs_begin());
888
889 // Copy contents of ScopeDescRecorder to nmethod
890 code_buffer->copy_values_to(this);
891 debug_info->copy_to(this);
892 dependencies->copy_to(this);
893 if (ScavengeRootsInCode) {
894 if (detect_scavenge_root_oops()) {
895 CodeCache::add_scavenge_root_nmethod(this);
896 }
897 Universe::heap()->register_nmethod(this);
898 }
899 debug_only(verify_scavenge_root_oops());
900
901 CodeCache::commit(this);
902
903 // Copy contents of ExceptionHandlerTable to nmethod
904 handler_table->copy_to(this);
905 nul_chk_table->copy_to(this);
906
907 // we use the information of entry points to find out if a method is
908 // static or non static
909 assert(compiler->is_c2() || compiler->is_jvmci() ||
910 _method->is_static() == (entry_point() == _verified_entry_point),
911 " entry points must be same for static methods and vice versa");
912 }
913
914 bool printnmethods = PrintNMethods || PrintNMethodsAtLevel == _comp_level
915 || CompilerOracle::should_print(_method)
916 || CompilerOracle::has_option_string(_method, "PrintNMethods");
917 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
918 print_nmethod(printnmethods);
919 }
920 }
921
922 // Print a short set of xml attributes to identify this nmethod. The
923 // output should be embedded in some other element.
924 void nmethod::log_identity(xmlStream* log) const {
925 log->print(" compile_id='%d'", compile_id());
926 const char* nm_kind = compile_kind();
927 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind);
928 if (compiler() != NULL) {
929 log->print(" compiler='%s'", compiler()->name());
930 }
931 if (TieredCompilation) {
932 log->print(" level='%d'", comp_level());
933 }
934 }
935
936
937 #define LOG_OFFSET(log, name) \
938 if ((intptr_t)name##_end() - (intptr_t)name##_begin()) \
939 log->print(" " XSTR(name) "_offset='%d'" , \
940 (intptr_t)name##_begin() - (intptr_t)this)
941
942
943 void nmethod::log_new_nmethod() const {
944 if (LogCompilation && xtty != NULL) {
945 ttyLocker ttyl;
946 HandleMark hm;
947 xtty->begin_elem("nmethod");
948 log_identity(xtty);
949 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", code_begin(), size());
950 xtty->print(" address='" INTPTR_FORMAT "'", (intptr_t) this);
951
952 LOG_OFFSET(xtty, relocation);
953 LOG_OFFSET(xtty, consts);
954 LOG_OFFSET(xtty, insts);
955 LOG_OFFSET(xtty, stub);
956 LOG_OFFSET(xtty, scopes_data);
957 LOG_OFFSET(xtty, scopes_pcs);
958 LOG_OFFSET(xtty, dependencies);
959 LOG_OFFSET(xtty, handler_table);
960 LOG_OFFSET(xtty, nul_chk_table);
961 LOG_OFFSET(xtty, oops);
962 LOG_OFFSET(xtty, metadata);
963
964 xtty->method(method());
965 xtty->stamp();
966 xtty->end_elem();
967 }
968 }
969
970 #undef LOG_OFFSET
971
972
973 // Print out more verbose output usually for a newly created nmethod.
974 void nmethod::print_on(outputStream* st, const char* msg) const {
975 if (st != NULL) {
976 ttyLocker ttyl;
977 if (WizardMode) {
978 CompileTask::print_compilation(st, this, msg, /*short_form:*/ true);
979 st->print_cr(" (" INTPTR_FORMAT ")", this);
980 } else {
981 CompileTask::print_compilation(st, this, msg, /*short_form:*/ false);
982 }
983 }
984 }
985
986
987 void nmethod::print_nmethod(bool printmethod) {
988 ttyLocker ttyl; // keep the following output all in one block
989 if (xtty != NULL) {
990 xtty->begin_head("print_nmethod");
991 xtty->stamp();
992 xtty->end_head();
993 }
994 // print the header part first
995 print();
996 // then print the requested information
997 if (printmethod) {
998 print_code();
999 print_pcs();
1000 if (oop_maps()) {
1001 oop_maps()->print();
1002 }
1003 }
1004 if (PrintDebugInfo || CompilerOracle::has_option_string(_method, "PrintDebugInfo")) {
1005 print_scopes();
1006 }
1007 if (PrintRelocations || CompilerOracle::has_option_string(_method, "PrintRelocations")) {
1008 print_relocations();
1009 }
1010 if (PrintDependencies || CompilerOracle::has_option_string(_method, "PrintDependencies")) {
1011 print_dependencies();
1012 }
1013 if (PrintExceptionHandlers) {
1014 print_handler_table();
1015 print_nul_chk_table();
1016 }
1017 if (xtty != NULL) {
1018 xtty->tail("print_nmethod");
1019 }
1020 }
1021
1022
1023 // Promote one word from an assembly-time handle to a live embedded oop.
1024 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
1025 if (handle == NULL ||
1026 // As a special case, IC oops are initialized to 1 or -1.
1027 handle == (jobject) Universe::non_oop_word()) {
1028 (*dest) = (oop) handle;
1029 } else {
1030 (*dest) = JNIHandles::resolve_non_null(handle);
1031 }
1032 }
1033
1034
1035 // Have to have the same name because it's called by a template
1036 void nmethod::copy_values(GrowableArray<jobject>* array) {
1037 int length = array->length();
1038 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
1039 oop* dest = oops_begin();
1040 for (int index = 0 ; index < length; index++) {
1041 initialize_immediate_oop(&dest[index], array->at(index));
1042 }
1043
1044 // Now we can fix up all the oops in the code. We need to do this
1045 // in the code because the assembler uses jobjects as placeholders.
1046 // The code and relocations have already been initialized by the
1047 // CodeBlob constructor, so it is valid even at this early point to
1048 // iterate over relocations and patch the code.
1049 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true);
1050 }
1051
1052 void nmethod::copy_values(GrowableArray<Metadata*>* array) {
1053 int length = array->length();
1054 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough");
1055 Metadata** dest = metadata_begin();
1056 for (int index = 0 ; index < length; index++) {
1057 dest[index] = array->at(index);
1058 }
1059 }
1060
1061 bool nmethod::is_at_poll_return(address pc) {
1062 RelocIterator iter(this, pc, pc+1);
1063 while (iter.next()) {
1064 if (iter.type() == relocInfo::poll_return_type)
1065 return true;
1066 }
1067 return false;
1068 }
1069
1070
1071 bool nmethod::is_at_poll_or_poll_return(address pc) {
1072 RelocIterator iter(this, pc, pc+1);
1073 while (iter.next()) {
1074 relocInfo::relocType t = iter.type();
1075 if (t == relocInfo::poll_return_type || t == relocInfo::poll_type)
1076 return true;
1077 }
1078 return false;
1079 }
1080
1081
1082 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) {
1083 // re-patch all oop-bearing instructions, just in case some oops moved
1084 RelocIterator iter(this, begin, end);
1085 while (iter.next()) {
1086 if (iter.type() == relocInfo::oop_type) {
1087 oop_Relocation* reloc = iter.oop_reloc();
1088 if (initialize_immediates && reloc->oop_is_immediate()) {
1089 oop* dest = reloc->oop_addr();
1090 initialize_immediate_oop(dest, (jobject) *dest);
1091 }
1092 // Refresh the oop-related bits of this instruction.
1093 reloc->fix_oop_relocation();
1094 } else if (iter.type() == relocInfo::metadata_type) {
1095 metadata_Relocation* reloc = iter.metadata_reloc();
1096 reloc->fix_metadata_relocation();
1097 }
1098 }
1099 }
1100
1101
1102 void nmethod::verify_oop_relocations() {
1103 // Ensure sure that the code matches the current oop values
1104 RelocIterator iter(this, NULL, NULL);
1105 while (iter.next()) {
1106 if (iter.type() == relocInfo::oop_type) {
1107 oop_Relocation* reloc = iter.oop_reloc();
1108 if (!reloc->oop_is_immediate()) {
1109 reloc->verify_oop_relocation();
1110 }
1111 }
1112 }
1113 }
1114
1115
1116 ScopeDesc* nmethod::scope_desc_at(address pc) {
1117 PcDesc* pd = pc_desc_at(pc);
1118 guarantee(pd != NULL, "scope must be present");
1119 return new ScopeDesc(this, pd->scope_decode_offset(),
1120 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(),
1121 pd->return_oop());
1122 }
1123
1124
1125 void nmethod::clear_inline_caches() {
1126 assert(SafepointSynchronize::is_at_safepoint(), "cleaning of IC's only allowed at safepoint");
1127 if (is_zombie()) {
1128 return;
1129 }
1130
1131 RelocIterator iter(this);
1132 while (iter.next()) {
1133 iter.reloc()->clear_inline_cache();
1134 }
1135 }
1136
1137 // Clear ICStubs of all compiled ICs
1138 void nmethod::clear_ic_stubs() {
1139 assert_locked_or_safepoint(CompiledIC_lock);
1140 RelocIterator iter(this);
1141 while(iter.next()) {
1142 if (iter.type() == relocInfo::virtual_call_type) {
1143 CompiledIC* ic = CompiledIC_at(&iter);
1144 ic->clear_ic_stub();
1145 }
1146 }
1147 }
1148
1149
1150 void nmethod::cleanup_inline_caches() {
1151 assert_locked_or_safepoint(CompiledIC_lock);
1152
1153 // If the method is not entrant or zombie then a JMP is plastered over the
1154 // first few bytes. If an oop in the old code was there, that oop
1155 // should not get GC'd. Skip the first few bytes of oops on
1156 // not-entrant methods.
1157 address low_boundary = verified_entry_point();
1158 if (!is_in_use()) {
1159 low_boundary += NativeJump::instruction_size;
1160 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1161 // This means that the low_boundary is going to be a little too high.
1162 // This shouldn't matter, since oops of non-entrant methods are never used.
1163 // In fact, why are we bothering to look at oops in a non-entrant method??
1164 }
1165
1166 // Find all calls in an nmethod and clear the ones that point to non-entrant,
1167 // zombie and unloaded nmethods.
1168 ResourceMark rm;
1169 RelocIterator iter(this, low_boundary);
1170 while(iter.next()) {
1171 switch(iter.type()) {
1172 case relocInfo::virtual_call_type:
1173 case relocInfo::opt_virtual_call_type: {
1174 CompiledIC *ic = CompiledIC_at(&iter);
1175 // Ok, to lookup references to zombies here
1176 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_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)) ic->set_to_clean();
1181 }
1182 break;
1183 }
1184 case relocInfo::static_call_type: {
1185 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
1186 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
1187 if( cb != NULL && cb->is_nmethod() ) {
1188 nmethod* nm = (nmethod*)cb;
1189 // Clean inline caches pointing to zombie, non-entrant and unloaded methods
1190 if (!nm->is_in_use() || (nm->method()->code() != nm)) csc->set_to_clean();
1191 }
1192 break;
1193 }
1194 }
1195 }
1196 }
1197
1198 void nmethod::verify_clean_inline_caches() {
1199 assert_locked_or_safepoint(CompiledIC_lock);
1200
1201 // If the method is not entrant or zombie then a JMP is plastered over the
1202 // first few bytes. If an oop in the old code was there, that oop
1203 // should not get GC'd. Skip the first few bytes of oops on
1204 // not-entrant methods.
1205 address low_boundary = verified_entry_point();
1206 if (!is_in_use()) {
1207 low_boundary += NativeJump::instruction_size;
1208 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1209 // This means that the low_boundary is going to be a little too high.
1210 // This shouldn't matter, since oops of non-entrant methods are never used.
1211 // In fact, why are we bothering to look at oops in a non-entrant method??
1212 }
1213
1214 ResourceMark rm;
1215 RelocIterator iter(this, low_boundary);
1216 while(iter.next()) {
1217 switch(iter.type()) {
1218 case relocInfo::virtual_call_type:
1219 case relocInfo::opt_virtual_call_type: {
1220 CompiledIC *ic = CompiledIC_at(&iter);
1221 // Ok, to lookup references to zombies here
1222 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
1223 if( cb != NULL && cb->is_nmethod() ) {
1224 nmethod* nm = (nmethod*)cb;
1225 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
1226 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1227 assert(ic->is_clean(), "IC should be clean");
1228 }
1229 }
1230 break;
1231 }
1232 case relocInfo::static_call_type: {
1233 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
1234 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
1235 if( cb != NULL && cb->is_nmethod() ) {
1236 nmethod* nm = (nmethod*)cb;
1237 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
1238 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1239 assert(csc->is_clean(), "IC should be clean");
1240 }
1241 }
1242 break;
1243 }
1244 }
1245 }
1246 }
1247
1248 int nmethod::verify_icholder_relocations() {
1249 int count = 0;
1250
1251 RelocIterator iter(this);
1252 while(iter.next()) {
1253 if (iter.type() == relocInfo::virtual_call_type) {
1254 if (CompiledIC::is_icholder_call_site(iter.virtual_call_reloc())) {
1255 CompiledIC *ic = CompiledIC_at(&iter);
1256 if (TraceCompiledIC) {
1257 tty->print("noticed icholder " INTPTR_FORMAT " ", p2i(ic->cached_icholder()));
1258 ic->print();
1259 }
1260 assert(ic->cached_icholder() != NULL, "must be non-NULL");
1261 count++;
1262 }
1263 }
1264 }
1265
1266 return count;
1267 }
1268
1269 // This is a private interface with the sweeper.
1270 void nmethod::mark_as_seen_on_stack() {
1271 assert(is_alive(), "Must be an alive method");
1272 // Set the traversal mark to ensure that the sweeper does 2
1273 // cleaning passes before moving to zombie.
1274 set_stack_traversal_mark(NMethodSweeper::traversal_count());
1275 }
1276
1277 // Tell if a non-entrant method can be converted to a zombie (i.e.,
1278 // there are no activations on the stack, not in use by the VM,
1279 // and not in use by the ServiceThread)
1280 bool nmethod::can_not_entrant_be_converted() {
1281 assert(is_not_entrant(), "must be a non-entrant method");
1282
1283 // Since the nmethod sweeper only does partial sweep the sweeper's traversal
1284 // count can be greater than the stack traversal count before it hits the
1285 // nmethod for the second time.
1286 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count() &&
1287 !is_locked_by_vm();
1288 }
1289
1290 void nmethod::inc_decompile_count() {
1291 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return;
1292 // Could be gated by ProfileTraps, but do not bother...
1293 Method* m = method();
1294 if (m == NULL) return;
1295 MethodData* mdo = m->method_data();
1296 if (mdo == NULL) return;
1297 // There is a benign race here. See comments in methodData.hpp.
1298 mdo->inc_decompile_count();
1299 }
1300
1301 void nmethod::increase_unloading_clock() {
1302 _global_unloading_clock++;
1303 if (_global_unloading_clock == 0) {
1304 // _nmethods are allocated with _unloading_clock == 0,
1305 // so 0 is never used as a clock value.
1306 _global_unloading_clock = 1;
1307 }
1308 }
1309
1310 void nmethod::set_unloading_clock(unsigned char unloading_clock) {
1311 OrderAccess::release_store((volatile jubyte*)&_unloading_clock, unloading_clock);
1312 }
1313
1314 unsigned char nmethod::unloading_clock() {
1315 return (unsigned char)OrderAccess::load_acquire((volatile jubyte*)&_unloading_clock);
1316 }
1317
1318 void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) {
1319
1320 post_compiled_method_unload();
1321
1322 // Since this nmethod is being unloaded, make sure that dependencies
1323 // recorded in instanceKlasses get flushed and pass non-NULL closure to
1324 // indicate that this work is being done during a GC.
1325 assert(Universe::heap()->is_gc_active(), "should only be called during gc");
1326 assert(is_alive != NULL, "Should be non-NULL");
1327 // A non-NULL is_alive closure indicates that this is being called during GC.
1328 flush_dependencies(is_alive);
1329
1330 // Break cycle between nmethod & method
1331 if (TraceClassUnloading && WizardMode) {
1332 tty->print_cr("[Class unloading: Making nmethod " INTPTR_FORMAT
1333 " unloadable], Method*(" INTPTR_FORMAT
1334 "), cause(" INTPTR_FORMAT ")",
1335 this, (address)_method, (address)cause);
1336 if (!Universe::heap()->is_gc_active())
1337 cause->klass()->print();
1338 }
1339 // Unlink the osr method, so we do not look this up again
1340 if (is_osr_method()) {
1341 invalidate_osr_method();
1342 }
1343 // If _method is already NULL the Method* is about to be unloaded,
1344 // so we don't have to break the cycle. Note that it is possible to
1345 // have the Method* live here, in case we unload the nmethod because
1346 // it is pointing to some oop (other than the Method*) being unloaded.
1347 if (_method != NULL) {
1348 // OSR methods point to the Method*, but the Method* does not
1349 // point back!
1350 if (_method->code() == this) {
1351 _method->clear_code(); // Break a cycle
1352 }
1353 _method = NULL; // Clear the method of this dead nmethod
1354 }
1355
1356 // Make the class unloaded - i.e., change state and notify sweeper
1357 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
1358 if (is_in_use()) {
1359 // Transitioning directly from live to unloaded -- so
1360 // we need to force a cache clean-up; remember this
1361 // for later on.
1362 CodeCache::set_needs_cache_clean(true);
1363 }
1364
1365 // Unregister must be done before the state change
1366 Universe::heap()->unregister_nmethod(this);
1367
1368 #if INCLUDE_JVMCI
1369 // The method can only be unloaded after the pointer to the installed code
1370 // Java wrapper is no longer alive. Here we need to clear out this weak
1371 // reference to the dead object. Nulling out the reference has to happen
1372 // after the method is unregistered since the original value may be still
1373 // tracked by the rset.
1374 if (_jvmci_installed_code != NULL) {
1375 InstalledCode::set_address(_jvmci_installed_code, 0);
1376 _jvmci_installed_code = NULL;
1377 }
1378 #endif
1379
1380 _state = unloaded;
1381
1382 // Log the unloading.
1383 log_state_change();
1384
1385 // The Method* is gone at this point
1386 assert(_method == NULL, "Tautology");
1387
1388 set_osr_link(NULL);
1389 //set_scavenge_root_link(NULL); // done by prune_scavenge_root_nmethods
1390 NMethodSweeper::report_state_change(this);
1391 }
1392
1393 void nmethod::invalidate_osr_method() {
1394 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
1395 // Remove from list of active nmethods
1396 if (method() != NULL)
1397 method()->method_holder()->remove_osr_nmethod(this);
1398 }
1399
1400 void nmethod::log_state_change() const {
1401 if (LogCompilation) {
1402 if (xtty != NULL) {
1403 ttyLocker ttyl; // keep the following output all in one block
1404 if (_state == unloaded) {
1405 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'",
1406 os::current_thread_id());
1407 } else {
1408 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s",
1409 os::current_thread_id(),
1410 (_state == zombie ? " zombie='1'" : ""));
1411 }
1412 log_identity(xtty);
1413 xtty->stamp();
1414 xtty->end_elem();
1415 }
1416 }
1417 if (PrintCompilation && _state != unloaded) {
1418 print_on(tty, _state == zombie ? "made zombie" : "made not entrant");
1419 }
1420 }
1421
1422 /**
1423 * Common functionality for both make_not_entrant and make_zombie
1424 */
1425 bool nmethod::make_not_entrant_or_zombie(unsigned int state) {
1426 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant");
1427 assert(!is_zombie(), "should not already be a zombie");
1428
1429 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below.
1430 nmethodLocker nml(this);
1431 methodHandle the_method(method());
1432 No_Safepoint_Verifier nsv;
1433
1434 // during patching, depending on the nmethod state we must notify the GC that
1435 // code has been unloaded, unregistering it. We cannot do this right while
1436 // holding the Patching_lock because we need to use the CodeCache_lock. This
1437 // would be prone to deadlocks.
1438 // This flag is used to remember whether we need to later lock and unregister.
1439 bool nmethod_needs_unregister = false;
1440
1441 {
1442 // invalidate osr nmethod before acquiring the patching lock since
1443 // they both acquire leaf locks and we don't want a deadlock.
1444 // This logic is equivalent to the logic below for patching the
1445 // verified entry point of regular methods.
1446 if (is_osr_method()) {
1447 // this effectively makes the osr nmethod not entrant
1448 invalidate_osr_method();
1449 }
1450
1451 // Enter critical section. Does not block for safepoint.
1452 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1453
1454 if (_state == state) {
1455 // another thread already performed this transition so nothing
1456 // to do, but return false to indicate this.
1457 return false;
1458 }
1459
1460 // The caller can be calling the method statically or through an inline
1461 // cache call.
1462 if (!is_osr_method() && !is_not_entrant()) {
1463 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
1464 SharedRuntime::get_handle_wrong_method_stub());
1465 }
1466
1467 if (is_in_use()) {
1468 // It's a true state change, so mark the method as decompiled.
1469 // Do it only for transition from alive.
1470 inc_decompile_count();
1471 }
1472
1473 // If the state is becoming a zombie, signal to unregister the nmethod with
1474 // the heap.
1475 // This nmethod may have already been unloaded during a full GC.
1476 if ((state == zombie) && !is_unloaded()) {
1477 nmethod_needs_unregister = true;
1478 }
1479
1480 // Must happen before state change. Otherwise we have a race condition in
1481 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately
1482 // transition its state from 'not_entrant' to 'zombie' without having to wait
1483 // for stack scanning.
1484 if (state == not_entrant) {
1485 mark_as_seen_on_stack();
1486 OrderAccess::storestore();
1487 }
1488
1489 // Change state
1490 _state = state;
1491
1492 // Log the transition once
1493 log_state_change();
1494
1495 // Remove nmethod from method.
1496 // We need to check if both the _code and _from_compiled_code_entry_point
1497 // refer to this nmethod because there is a race in setting these two fields
1498 // in Method* as seen in bugid 4947125.
1499 // If the vep() points to the zombie nmethod, the memory for the nmethod
1500 // could be flushed and the compiler and vtable stubs could still call
1501 // through it.
1502 if (method() != NULL && (method()->code() == this ||
1503 method()->from_compiled_entry() == verified_entry_point())) {
1504 HandleMark hm;
1505 method()->clear_code();
1506 }
1507 } // leave critical region under Patching_lock
1508
1509 // When the nmethod becomes zombie it is no longer alive so the
1510 // dependencies must be flushed. nmethods in the not_entrant
1511 // state will be flushed later when the transition to zombie
1512 // happens or they get unloaded.
1513 if (state == zombie) {
1514 {
1515 // Flushing dependecies must be done before any possible
1516 // safepoint can sneak in, otherwise the oops used by the
1517 // dependency logic could have become stale.
1518 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1519 if (nmethod_needs_unregister) {
1520 Universe::heap()->unregister_nmethod(this);
1521 }
1522 flush_dependencies(NULL);
1523 }
1524
1525 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload
1526 // event and it hasn't already been reported for this nmethod then
1527 // report it now. The event may have been reported earilier if the GC
1528 // marked it for unloading). JvmtiDeferredEventQueue support means
1529 // we no longer go to a safepoint here.
1530 post_compiled_method_unload();
1531
1532 #ifdef ASSERT
1533 // It's no longer safe to access the oops section since zombie
1534 // nmethods aren't scanned for GC.
1535 _oops_are_stale = true;
1536 #endif
1537 // the Method may be reclaimed by class unloading now that the
1538 // nmethod is in zombie state
1539 set_method(NULL);
1540 } else {
1541 assert(state == not_entrant, "other cases may need to be handled differently");
1542 }
1543 #if INCLUDE_JVMCI
1544 if (_jvmci_installed_code != NULL) {
1545 // Break the link between nmethod and InstalledCode such that the nmethod can subsequently be flushed safely.
1546 InstalledCode::set_address(_jvmci_installed_code, 0);
1547 }
1548 #endif
1549
1550 if (TraceCreateZombies) {
1551 ResourceMark m;
1552 tty->print_cr("nmethod <" INTPTR_FORMAT "> %s code made %s", this, this->method() ? this->method()->name_and_sig_as_C_string() : "null", (state == not_entrant) ? "not entrant" : "zombie");
1553 }
1554
1555 NMethodSweeper::report_state_change(this);
1556 return true;
1557 }
1558
1559 void nmethod::flush() {
1560 // Note that there are no valid oops in the nmethod anymore.
1561 assert(is_zombie() || (is_osr_method() && is_unloaded()), "must be a zombie method");
1562 assert(is_marked_for_reclamation() || (is_osr_method() && is_unloaded()), "must be marked for reclamation");
1563
1564 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed");
1565 assert_locked_or_safepoint(CodeCache_lock);
1566
1567 // completely deallocate this method
1568 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, this);
1569 if (PrintMethodFlushing) {
1570 tty->print_cr("*flushing nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT "/Free CodeCache:" SIZE_FORMAT "Kb",
1571 _compile_id, this, CodeCache::nof_blobs(), CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024);
1572 }
1573
1574 // We need to deallocate any ExceptionCache data.
1575 // Note that we do not need to grab the nmethod lock for this, it
1576 // better be thread safe if we're disposing of it!
1577 ExceptionCache* ec = exception_cache();
1578 set_exception_cache(NULL);
1579 while(ec != NULL) {
1580 ExceptionCache* next = ec->next();
1581 delete ec;
1582 ec = next;
1583 }
1584
1585 if (on_scavenge_root_list()) {
1586 CodeCache::drop_scavenge_root_nmethod(this);
1587 }
1588
1589 #ifdef SHARK
1590 ((SharkCompiler *) compiler())->free_compiled_method(insts_begin());
1591 #endif // SHARK
1592
1593 ((CodeBlob*)(this))->flush();
1594
1595 CodeCache::free(this);
1596 }
1597
1598 //
1599 // Notify all classes this nmethod is dependent on that it is no
1600 // longer dependent. This should only be called in two situations.
1601 // First, when a nmethod transitions to a zombie all dependents need
1602 // to be clear. Since zombification happens at a safepoint there's no
1603 // synchronization issues. The second place is a little more tricky.
1604 // During phase 1 of mark sweep class unloading may happen and as a
1605 // result some nmethods may get unloaded. In this case the flushing
1606 // of dependencies must happen during phase 1 since after GC any
1607 // dependencies in the unloaded nmethod won't be updated, so
1608 // traversing the dependency information in unsafe. In that case this
1609 // function is called with a non-NULL argument and this function only
1610 // notifies instanceKlasses that are reachable
1611
1612 void nmethod::flush_dependencies(BoolObjectClosure* is_alive) {
1613 assert_locked_or_safepoint(CodeCache_lock);
1614 assert(Universe::heap()->is_gc_active() == (is_alive != NULL),
1615 "is_alive is non-NULL if and only if we are called during GC");
1616 if (!has_flushed_dependencies()) {
1617 set_has_flushed_dependencies();
1618 for (Dependencies::DepStream deps(this); deps.next(); ) {
1619 if (deps.type() == Dependencies::call_site_target_value) {
1620 // CallSite dependencies are managed on per-CallSite instance basis.
1621 oop call_site = deps.argument_oop(0);
1622 MethodHandles::remove_dependent_nmethod(call_site, this);
1623 } else {
1624 Klass* klass = deps.context_type();
1625 if (klass == NULL) {
1626 continue; // ignore things like evol_method
1627 }
1628 // During GC the is_alive closure is non-NULL, and is used to
1629 // determine liveness of dependees that need to be updated.
1630 if (is_alive == NULL || klass->is_loader_alive(is_alive)) {
1631 InstanceKlass::cast(klass)->remove_dependent_nmethod(this);
1632 }
1633 }
1634 }
1635 }
1636 }
1637
1638
1639 // If this oop is not live, the nmethod can be unloaded.
1640 bool nmethod::can_unload(BoolObjectClosure* is_alive, oop* root, bool unloading_occurred) {
1641 assert(root != NULL, "just checking");
1642 oop obj = *root;
1643 if (obj == NULL || is_alive->do_object_b(obj)) {
1644 return false;
1645 }
1646
1647 // If ScavengeRootsInCode is true, an nmethod might be unloaded
1648 // simply because one of its constant oops has gone dead.
1649 // No actual classes need to be unloaded in order for this to occur.
1650 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading");
1651 make_unloaded(is_alive, obj);
1652 return true;
1653 }
1654
1655 // ------------------------------------------------------------------
1656 // post_compiled_method_load_event
1657 // new method for install_code() path
1658 // Transfer information from compilation to jvmti
1659 void nmethod::post_compiled_method_load_event() {
1660
1661 Method* moop = method();
1662 HOTSPOT_COMPILED_METHOD_LOAD(
1663 (char *) moop->klass_name()->bytes(),
1664 moop->klass_name()->utf8_length(),
1665 (char *) moop->name()->bytes(),
1666 moop->name()->utf8_length(),
1667 (char *) moop->signature()->bytes(),
1668 moop->signature()->utf8_length(),
1669 insts_begin(), insts_size());
1670
1671 if (JvmtiExport::should_post_compiled_method_load() ||
1672 JvmtiExport::should_post_compiled_method_unload()) {
1673 get_and_cache_jmethod_id();
1674 }
1675
1676 if (JvmtiExport::should_post_compiled_method_load()) {
1677 // Let the Service thread (which is a real Java thread) post the event
1678 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1679 JvmtiDeferredEventQueue::enqueue(
1680 JvmtiDeferredEvent::compiled_method_load_event(this));
1681 }
1682 }
1683
1684 jmethodID nmethod::get_and_cache_jmethod_id() {
1685 if (_jmethod_id == NULL) {
1686 // Cache the jmethod_id since it can no longer be looked up once the
1687 // method itself has been marked for unloading.
1688 _jmethod_id = method()->jmethod_id();
1689 }
1690 return _jmethod_id;
1691 }
1692
1693 void nmethod::post_compiled_method_unload() {
1694 if (unload_reported()) {
1695 // During unloading we transition to unloaded and then to zombie
1696 // and the unloading is reported during the first transition.
1697 return;
1698 }
1699
1700 assert(_method != NULL && !is_unloaded(), "just checking");
1701 DTRACE_METHOD_UNLOAD_PROBE(method());
1702
1703 // If a JVMTI agent has enabled the CompiledMethodUnload event then
1704 // post the event. Sometime later this nmethod will be made a zombie
1705 // by the sweeper but the Method* will not be valid at that point.
1706 // If the _jmethod_id is null then no load event was ever requested
1707 // so don't bother posting the unload. The main reason for this is
1708 // that the jmethodID is a weak reference to the Method* so if
1709 // it's being unloaded there's no way to look it up since the weak
1710 // ref will have been cleared.
1711 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) {
1712 assert(!unload_reported(), "already unloaded");
1713 JvmtiDeferredEvent event =
1714 JvmtiDeferredEvent::compiled_method_unload_event(this,
1715 _jmethod_id, insts_begin());
1716 if (SafepointSynchronize::is_at_safepoint()) {
1717 // Don't want to take the queueing lock. Add it as pending and
1718 // it will get enqueued later.
1719 JvmtiDeferredEventQueue::add_pending_event(event);
1720 } else {
1721 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1722 JvmtiDeferredEventQueue::enqueue(event);
1723 }
1724 }
1725
1726 // The JVMTI CompiledMethodUnload event can be enabled or disabled at
1727 // any time. As the nmethod is being unloaded now we mark it has
1728 // having the unload event reported - this will ensure that we don't
1729 // attempt to report the event in the unlikely scenario where the
1730 // event is enabled at the time the nmethod is made a zombie.
1731 set_unload_reported();
1732 }
1733
1734 void static clean_ic_if_metadata_is_dead(CompiledIC *ic, BoolObjectClosure *is_alive) {
1735 if (ic->is_icholder_call()) {
1736 // The only exception is compiledICHolder oops which may
1737 // yet be marked below. (We check this further below).
1738 CompiledICHolder* cichk_oop = ic->cached_icholder();
1739
1740 if (cichk_oop->holder_method()->method_holder()->is_loader_alive(is_alive) &&
1741 cichk_oop->holder_klass()->is_loader_alive(is_alive)) {
1742 return;
1743 }
1744 } else {
1745 Metadata* ic_oop = ic->cached_metadata();
1746 if (ic_oop != NULL) {
1747 if (ic_oop->is_klass()) {
1748 if (((Klass*)ic_oop)->is_loader_alive(is_alive)) {
1749 return;
1750 }
1751 } else if (ic_oop->is_method()) {
1752 if (((Method*)ic_oop)->method_holder()->is_loader_alive(is_alive)) {
1753 return;
1754 }
1755 } else {
1756 ShouldNotReachHere();
1757 }
1758 }
1759 }
1760
1761 ic->set_to_clean();
1762 }
1763
1764 // This is called at the end of the strong tracing/marking phase of a
1765 // GC to unload an nmethod if it contains otherwise unreachable
1766 // oops.
1767
1768 void nmethod::do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred) {
1769 // Make sure the oop's ready to receive visitors
1770 assert(!is_zombie() && !is_unloaded(),
1771 "should not call follow on zombie or unloaded nmethod");
1772
1773 // If the method is not entrant then a JMP is plastered over the
1774 // first few bytes. If an oop in the old code was there, that oop
1775 // should not get GC'd. Skip the first few bytes of oops on
1776 // not-entrant methods.
1777 address low_boundary = verified_entry_point();
1778 if (is_not_entrant()) {
1779 low_boundary += NativeJump::instruction_size;
1780 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1781 // (See comment above.)
1782 }
1783
1784 // The RedefineClasses() API can cause the class unloading invariant
1785 // to no longer be true. See jvmtiExport.hpp for details.
1786 // Also, leave a debugging breadcrumb in local flag.
1787 if (JvmtiExport::has_redefined_a_class()) {
1788 // This set of the unloading_occurred flag is done before the
1789 // call to post_compiled_method_unload() so that the unloading
1790 // of this nmethod is reported.
1791 unloading_occurred = true;
1792 }
1793
1794 // Exception cache
1795 clean_exception_cache(is_alive);
1796
1797 // If class unloading occurred we first iterate over all inline caches and
1798 // clear ICs where the cached oop is referring to an unloaded klass or method.
1799 // The remaining live cached oops will be traversed in the relocInfo::oop_type
1800 // iteration below.
1801 if (unloading_occurred) {
1802 RelocIterator iter(this, low_boundary);
1803 while(iter.next()) {
1804 if (iter.type() == relocInfo::virtual_call_type) {
1805 CompiledIC *ic = CompiledIC_at(&iter);
1806 clean_ic_if_metadata_is_dead(ic, is_alive);
1807 }
1808 }
1809 }
1810
1811 // Compiled code
1812 {
1813 RelocIterator iter(this, low_boundary);
1814 while (iter.next()) {
1815 if (iter.type() == relocInfo::oop_type) {
1816 oop_Relocation* r = iter.oop_reloc();
1817 // In this loop, we must only traverse those oops directly embedded in
1818 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1819 assert(1 == (r->oop_is_immediate()) +
1820 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1821 "oop must be found in exactly one place");
1822 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1823 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) {
1824 return;
1825 }
1826 }
1827 }
1828 }
1829 }
1830
1831
1832 // Scopes
1833 for (oop* p = oops_begin(); p < oops_end(); p++) {
1834 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1835 if (can_unload(is_alive, p, unloading_occurred)) {
1836 return;
1837 }
1838 }
1839
1840 #if INCLUDE_JVMCI
1841 // Follow JVMCI method
1842 BarrierSet* bs = Universe::heap()->barrier_set();
1843 if (_jvmci_installed_code != NULL) {
1844 if (_jvmci_installed_code->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(_jvmci_installed_code)) {
1845 if (!is_alive->do_object_b(_jvmci_installed_code)) {
1846 bs->write_ref_nmethod_pre(&_jvmci_installed_code, this);
1847 _jvmci_installed_code = NULL;
1848 bs->write_ref_nmethod_post(&_jvmci_installed_code, this);
1849 }
1850 } else {
1851 if (can_unload(is_alive, (oop*)&_jvmci_installed_code, unloading_occurred)) {
1852 return;
1853 }
1854 }
1855 }
1856
1857 if (_speculation_log != NULL) {
1858 if (!is_alive->do_object_b(_speculation_log)) {
1859 bs->write_ref_nmethod_pre(&_speculation_log, this);
1860 _speculation_log = NULL;
1861 bs->write_ref_nmethod_post(&_speculation_log, this);
1862 }
1863 }
1864 #endif
1865
1866
1867 // Ensure that all metadata is still alive
1868 verify_metadata_loaders(low_boundary, is_alive);
1869 }
1870
1871 template <class CompiledICorStaticCall>
1872 static bool clean_if_nmethod_is_unloaded(CompiledICorStaticCall *ic, address addr, BoolObjectClosure *is_alive, nmethod* from) {
1873 // Ok, to lookup references to zombies here
1874 CodeBlob *cb = CodeCache::find_blob_unsafe(addr);
1875 if (cb != NULL && cb->is_nmethod()) {
1876 nmethod* nm = (nmethod*)cb;
1877
1878 if (nm->unloading_clock() != nmethod::global_unloading_clock()) {
1879 // The nmethod has not been processed yet.
1880 return true;
1881 }
1882
1883 // Clean inline caches pointing to both zombie and not_entrant methods
1884 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1885 ic->set_to_clean();
1886 assert(ic->is_clean(), err_msg("nmethod " PTR_FORMAT "not clean %s", from, from->method()->name_and_sig_as_C_string()));
1887 }
1888 }
1889
1890 return false;
1891 }
1892
1893 static bool clean_if_nmethod_is_unloaded(CompiledIC *ic, BoolObjectClosure *is_alive, nmethod* from) {
1894 return clean_if_nmethod_is_unloaded(ic, ic->ic_destination(), is_alive, from);
1895 }
1896
1897 static bool clean_if_nmethod_is_unloaded(CompiledStaticCall *csc, BoolObjectClosure *is_alive, nmethod* from) {
1898 return clean_if_nmethod_is_unloaded(csc, csc->destination(), is_alive, from);
1899 }
1900
1901 bool nmethod::unload_if_dead_at(RelocIterator* iter_at_oop, BoolObjectClosure *is_alive, bool unloading_occurred) {
1902 assert(iter_at_oop->type() == relocInfo::oop_type, "Wrong relocation type");
1903
1904 oop_Relocation* r = iter_at_oop->oop_reloc();
1905 // Traverse those oops directly embedded in the code.
1906 // Other oops (oop_index>0) are seen as part of scopes_oops.
1907 assert(1 == (r->oop_is_immediate()) +
1908 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1909 "oop must be found in exactly one place");
1910 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1911 // Unload this nmethod if the oop is dead.
1912 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) {
1913 return true;;
1914 }
1915 }
1916
1917 return false;
1918 }
1919
1920
1921 bool nmethod::do_unloading_parallel(BoolObjectClosure* is_alive, bool unloading_occurred) {
1922 ResourceMark rm;
1923
1924 // Make sure the oop's ready to receive visitors
1925 assert(!is_zombie() && !is_unloaded(),
1926 "should not call follow on zombie or unloaded nmethod");
1927
1928 // If the method is not entrant then a JMP is plastered over the
1929 // first few bytes. If an oop in the old code was there, that oop
1930 // should not get GC'd. Skip the first few bytes of oops on
1931 // not-entrant methods.
1932 address low_boundary = verified_entry_point();
1933 if (is_not_entrant()) {
1934 low_boundary += NativeJump::instruction_size;
1935 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1936 // (See comment above.)
1937 }
1938
1939 // The RedefineClasses() API can cause the class unloading invariant
1940 // to no longer be true. See jvmtiExport.hpp for details.
1941 // Also, leave a debugging breadcrumb in local flag.
1942 if (JvmtiExport::has_redefined_a_class()) {
1943 // This set of the unloading_occurred flag is done before the
1944 // call to post_compiled_method_unload() so that the unloading
1945 // of this nmethod is reported.
1946 unloading_occurred = true;
1947 }
1948
1949 #if INCLUDE_JVMCI
1950 // Follow JVMCI method
1951 if (_jvmci_installed_code != NULL) {
1952 if (_jvmci_installed_code->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(_jvmci_installed_code)) {
1953 if (!is_alive->do_object_b(_jvmci_installed_code)) {
1954 _jvmci_installed_code = NULL;
1955 }
1956 } else {
1957 if (can_unload(is_alive, (oop*)&_jvmci_installed_code, unloading_occurred)) {
1958 return false;
1959 }
1960 }
1961 }
1962
1963 if (_speculation_log != NULL) {
1964 if (!is_alive->do_object_b(_speculation_log)) {
1965 _speculation_log = NULL;
1966 }
1967 }
1968 #endif
1969
1970 // Exception cache
1971 clean_exception_cache(is_alive);
1972
1973 bool is_unloaded = false;
1974 bool postponed = false;
1975
1976 RelocIterator iter(this, low_boundary);
1977 while(iter.next()) {
1978
1979 switch (iter.type()) {
1980
1981 case relocInfo::virtual_call_type:
1982 if (unloading_occurred) {
1983 // If class unloading occurred we first iterate over all inline caches and
1984 // clear ICs where the cached oop is referring to an unloaded klass or method.
1985 clean_ic_if_metadata_is_dead(CompiledIC_at(&iter), is_alive);
1986 }
1987
1988 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
1989 break;
1990
1991 case relocInfo::opt_virtual_call_type:
1992 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
1993 break;
1994
1995 case relocInfo::static_call_type:
1996 postponed |= clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this);
1997 break;
1998
1999 case relocInfo::oop_type:
2000 if (!is_unloaded) {
2001 is_unloaded = unload_if_dead_at(&iter, is_alive, unloading_occurred);
2002 }
2003 break;
2004
2005 case relocInfo::metadata_type:
2006 break; // nothing to do.
2007 }
2008 }
2009
2010 if (is_unloaded) {
2011 return postponed;
2012 }
2013
2014 // Scopes
2015 for (oop* p = oops_begin(); p < oops_end(); p++) {
2016 if (*p == Universe::non_oop_word()) continue; // skip non-oops
2017 if (can_unload(is_alive, p, unloading_occurred)) {
2018 is_unloaded = true;
2019 break;
2020 }
2021 }
2022
2023 if (is_unloaded) {
2024 return postponed;
2025 }
2026
2027 #if INCLUDE_JVMCI
2028 // Follow JVMCI method
2029 BarrierSet* bs = Universe::heap()->barrier_set();
2030 if (_jvmci_installed_code != NULL) {
2031 if (_jvmci_installed_code->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(_jvmci_installed_code)) {
2032 if (!is_alive->do_object_b(_jvmci_installed_code)) {
2033 bs->write_ref_nmethod_pre(&_jvmci_installed_code, this);
2034 _jvmci_installed_code = NULL;
2035 bs->write_ref_nmethod_post(&_jvmci_installed_code, this);
2036 }
2037 } else {
2038 if (can_unload(is_alive, (oop*)&_jvmci_installed_code, unloading_occurred)) {
2039 is_unloaded = true;
2040 }
2041 }
2042 }
2043
2044 if (_speculation_log != NULL) {
2045 if (!is_alive->do_object_b(_speculation_log)) {
2046 bs->write_ref_nmethod_pre(&_speculation_log, this);
2047 _speculation_log = NULL;
2048 bs->write_ref_nmethod_post(&_speculation_log, this);
2049 }
2050 }
2051 #endif
2052
2053 // Ensure that all metadata is still alive
2054 verify_metadata_loaders(low_boundary, is_alive);
2055
2056 return postponed;
2057 }
2058
2059 void nmethod::do_unloading_parallel_postponed(BoolObjectClosure* is_alive, bool unloading_occurred) {
2060 ResourceMark rm;
2061
2062 // Make sure the oop's ready to receive visitors
2063 assert(!is_zombie(),
2064 "should not call follow on zombie nmethod");
2065
2066 // If the method is not entrant then a JMP is plastered over the
2067 // first few bytes. If an oop in the old code was there, that oop
2068 // should not get GC'd. Skip the first few bytes of oops on
2069 // not-entrant methods.
2070 address low_boundary = verified_entry_point();
2071 if (is_not_entrant()) {
2072 low_boundary += NativeJump::instruction_size;
2073 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
2074 // (See comment above.)
2075 }
2076
2077 RelocIterator iter(this, low_boundary);
2078 while(iter.next()) {
2079
2080 switch (iter.type()) {
2081
2082 case relocInfo::virtual_call_type:
2083 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
2084 break;
2085
2086 case relocInfo::opt_virtual_call_type:
2087 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
2088 break;
2089
2090 case relocInfo::static_call_type:
2091 clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this);
2092 break;
2093 }
2094 }
2095 }
2096
2097 #ifdef ASSERT
2098
2099 class CheckClass : AllStatic {
2100 static BoolObjectClosure* _is_alive;
2101
2102 // Check class_loader is alive for this bit of metadata.
2103 static void check_class(Metadata* md) {
2104 Klass* klass = NULL;
2105 if (md->is_klass()) {
2106 klass = ((Klass*)md);
2107 } else if (md->is_method()) {
2108 klass = ((Method*)md)->method_holder();
2109 } else if (md->is_methodData()) {
2110 klass = ((MethodData*)md)->method()->method_holder();
2111 } else {
2112 md->print();
2113 ShouldNotReachHere();
2114 }
2115 assert(klass->is_loader_alive(_is_alive), "must be alive");
2116 }
2117 public:
2118 static void do_check_class(BoolObjectClosure* is_alive, nmethod* nm) {
2119 assert(SafepointSynchronize::is_at_safepoint(), "this is only ok at safepoint");
2120 _is_alive = is_alive;
2121 nm->metadata_do(check_class);
2122 }
2123 };
2124
2125 // This is called during a safepoint so can use static data
2126 BoolObjectClosure* CheckClass::_is_alive = NULL;
2127 #endif // ASSERT
2128
2129
2130 // Processing of oop references should have been sufficient to keep
2131 // all strong references alive. Any weak references should have been
2132 // cleared as well. Visit all the metadata and ensure that it's
2133 // really alive.
2134 void nmethod::verify_metadata_loaders(address low_boundary, BoolObjectClosure* is_alive) {
2135 #ifdef ASSERT
2136 RelocIterator iter(this, low_boundary);
2137 while (iter.next()) {
2138 // static_stub_Relocations may have dangling references to
2139 // Method*s so trim them out here. Otherwise it looks like
2140 // compiled code is maintaining a link to dead metadata.
2141 address static_call_addr = NULL;
2142 if (iter.type() == relocInfo::opt_virtual_call_type) {
2143 CompiledIC* cic = CompiledIC_at(&iter);
2144 if (!cic->is_call_to_interpreted()) {
2145 static_call_addr = iter.addr();
2146 }
2147 } else if (iter.type() == relocInfo::static_call_type) {
2148 CompiledStaticCall* csc = compiledStaticCall_at(iter.reloc());
2149 if (!csc->is_call_to_interpreted()) {
2150 static_call_addr = iter.addr();
2151 }
2152 }
2153 if (static_call_addr != NULL) {
2154 RelocIterator sciter(this, low_boundary);
2155 while (sciter.next()) {
2156 if (sciter.type() == relocInfo::static_stub_type &&
2157 sciter.static_stub_reloc()->static_call() == static_call_addr) {
2158 sciter.static_stub_reloc()->clear_inline_cache();
2159 }
2160 }
2161 }
2162 }
2163 // Check that the metadata embedded in the nmethod is alive
2164 CheckClass::do_check_class(is_alive, this);
2165 #endif
2166 }
2167
2168
2169 // Iterate over metadata calling this function. Used by RedefineClasses
2170 void nmethod::metadata_do(void f(Metadata*)) {
2171 address low_boundary = verified_entry_point();
2172 if (is_not_entrant()) {
2173 low_boundary += NativeJump::instruction_size;
2174 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
2175 // (See comment above.)
2176 }
2177 {
2178 // Visit all immediate references that are embedded in the instruction stream.
2179 RelocIterator iter(this, low_boundary);
2180 while (iter.next()) {
2181 if (iter.type() == relocInfo::metadata_type ) {
2182 metadata_Relocation* r = iter.metadata_reloc();
2183 // In this metadata, we must only follow those metadatas directly embedded in
2184 // the code. Other metadatas (oop_index>0) are seen as part of
2185 // the metadata section below.
2186 assert(1 == (r->metadata_is_immediate()) +
2187 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
2188 "metadata must be found in exactly one place");
2189 if (r->metadata_is_immediate() && r->metadata_value() != NULL) {
2190 Metadata* md = r->metadata_value();
2191 if (md != _method) f(md);
2192 }
2193 } else if (iter.type() == relocInfo::virtual_call_type) {
2194 // Check compiledIC holders associated with this nmethod
2195 CompiledIC *ic = CompiledIC_at(&iter);
2196 if (ic->is_icholder_call()) {
2197 CompiledICHolder* cichk = ic->cached_icholder();
2198 f(cichk->holder_method());
2199 f(cichk->holder_klass());
2200 } else {
2201 Metadata* ic_oop = ic->cached_metadata();
2202 if (ic_oop != NULL) {
2203 f(ic_oop);
2204 }
2205 }
2206 }
2207 }
2208 }
2209
2210 // Visit the metadata section
2211 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
2212 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops
2213 Metadata* md = *p;
2214 f(md);
2215 }
2216
2217 // Visit metadata not embedded in the other places.
2218 if (_method != NULL) f(_method);
2219 }
2220
2221 void nmethod::oops_do(OopClosure* f, bool allow_zombie) {
2222 // make sure the oops ready to receive visitors
2223 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod");
2224 assert(!is_unloaded(), "should not call follow on unloaded nmethod");
2225
2226 // If the method is not entrant or zombie then a JMP is plastered over the
2227 // first few bytes. If an oop in the old code was there, that oop
2228 // should not get GC'd. Skip the first few bytes of oops on
2229 // not-entrant methods.
2230 address low_boundary = verified_entry_point();
2231 if (is_not_entrant()) {
2232 low_boundary += NativeJump::instruction_size;
2233 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
2234 // (See comment above.)
2235 }
2236
2237 #if INCLUDE_JVMCI
2238 if (_jvmci_installed_code != NULL) {
2239 f->do_oop((oop*) &_jvmci_installed_code);
2240 }
2241 if (_speculation_log != NULL) {
2242 f->do_oop((oop*) &_speculation_log);
2243 }
2244 #endif
2245
2246 RelocIterator iter(this, low_boundary);
2247
2248 while (iter.next()) {
2249 if (iter.type() == relocInfo::oop_type ) {
2250 oop_Relocation* r = iter.oop_reloc();
2251 // In this loop, we must only follow those oops directly embedded in
2252 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
2253 assert(1 == (r->oop_is_immediate()) +
2254 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
2255 "oop must be found in exactly one place");
2256 if (r->oop_is_immediate() && r->oop_value() != NULL) {
2257 f->do_oop(r->oop_addr());
2258 }
2259 }
2260 }
2261
2262 // Scopes
2263 // This includes oop constants not inlined in the code stream.
2264 for (oop* p = oops_begin(); p < oops_end(); p++) {
2265 if (*p == Universe::non_oop_word()) continue; // skip non-oops
2266 f->do_oop(p);
2267 }
2268 }
2269
2270 #define NMETHOD_SENTINEL ((nmethod*)badAddress)
2271
2272 nmethod* volatile nmethod::_oops_do_mark_nmethods;
2273
2274 // An nmethod is "marked" if its _mark_link is set non-null.
2275 // Even if it is the end of the linked list, it will have a non-null link value,
2276 // as long as it is on the list.
2277 // This code must be MP safe, because it is used from parallel GC passes.
2278 bool nmethod::test_set_oops_do_mark() {
2279 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");
2280 nmethod* observed_mark_link = _oops_do_mark_link;
2281 if (observed_mark_link == NULL) {
2282 // Claim this nmethod for this thread to mark.
2283 observed_mark_link = (nmethod*)
2284 Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_link, NULL);
2285 if (observed_mark_link == NULL) {
2286
2287 // Atomically append this nmethod (now claimed) to the head of the list:
2288 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods;
2289 for (;;) {
2290 nmethod* required_mark_nmethods = observed_mark_nmethods;
2291 _oops_do_mark_link = required_mark_nmethods;
2292 observed_mark_nmethods = (nmethod*)
2293 Atomic::cmpxchg_ptr(this, &_oops_do_mark_nmethods, required_mark_nmethods);
2294 if (observed_mark_nmethods == required_mark_nmethods)
2295 break;
2296 }
2297 // Mark was clear when we first saw this guy.
2298 NOT_PRODUCT(if (TraceScavenge) print_on(tty, "oops_do, mark"));
2299 return false;
2300 }
2301 }
2302 // On fall through, another racing thread marked this nmethod before we did.
2303 return true;
2304 }
2305
2306 void nmethod::oops_do_marking_prologue() {
2307 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("[oops_do_marking_prologue"));
2308 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row");
2309 // We use cmpxchg_ptr instead of regular assignment here because the user
2310 // may fork a bunch of threads, and we need them all to see the same state.
2311 void* observed = Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, NULL);
2312 guarantee(observed == NULL, "no races in this sequential code");
2313 }
2314
2315 void nmethod::oops_do_marking_epilogue() {
2316 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row");
2317 nmethod* cur = _oops_do_mark_nmethods;
2318 while (cur != NMETHOD_SENTINEL) {
2319 assert(cur != NULL, "not NULL-terminated");
2320 nmethod* next = cur->_oops_do_mark_link;
2321 cur->_oops_do_mark_link = NULL;
2322 cur->verify_oop_relocations();
2323 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark"));
2324 cur = next;
2325 }
2326 void* required = _oops_do_mark_nmethods;
2327 void* observed = Atomic::cmpxchg_ptr(NULL, &_oops_do_mark_nmethods, required);
2328 guarantee(observed == required, "no races in this sequential code");
2329 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("oops_do_marking_epilogue]"));
2330 }
2331
2332 class DetectScavengeRoot: public OopClosure {
2333 bool _detected_scavenge_root;
2334 public:
2335 DetectScavengeRoot() : _detected_scavenge_root(false)
2336 { NOT_PRODUCT(_print_nm = NULL); }
2337 bool detected_scavenge_root() { return _detected_scavenge_root; }
2338 virtual void do_oop(oop* p) {
2339 if ((*p) != NULL && (*p)->is_scavengable()) {
2340 NOT_PRODUCT(maybe_print(p));
2341 _detected_scavenge_root = true;
2342 }
2343 }
2344 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2345
2346 #ifndef PRODUCT
2347 nmethod* _print_nm;
2348 void maybe_print(oop* p) {
2349 if (_print_nm == NULL) return;
2350 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root");
2351 tty->print_cr("" PTR_FORMAT "[offset=%d] detected scavengable oop " PTR_FORMAT " (found at " PTR_FORMAT ")",
2352 _print_nm, (int)((intptr_t)p - (intptr_t)_print_nm),
2353 (void *)(*p), (intptr_t)p);
2354 (*p)->print();
2355 }
2356 #endif //PRODUCT
2357 };
2358
2359 bool nmethod::detect_scavenge_root_oops() {
2360 DetectScavengeRoot detect_scavenge_root;
2361 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this);
2362 oops_do(&detect_scavenge_root);
2363 return detect_scavenge_root.detected_scavenge_root();
2364 }
2365
2366 // Method that knows how to preserve outgoing arguments at call. This method must be
2367 // called with a frame corresponding to a Java invoke
2368 void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) {
2369 #ifndef SHARK
2370 if (method() != NULL && !method()->is_native()) {
2371 SimpleScopeDesc ssd(this, fr.pc());
2372 Bytecode_invoke call(ssd.method(), ssd.bci());
2373 bool has_receiver = call.has_receiver();
2374 bool has_appendix = call.has_appendix();
2375 Symbol* signature = call.signature();
2376 fr.oops_compiled_arguments_do(signature, has_receiver, has_appendix, reg_map, f);
2377 }
2378 #endif // !SHARK
2379 }
2380
2381 inline bool includes(void* p, void* from, void* to) {
2382 return from <= p && p < to;
2383 }
2384
2385
2386 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
2387 assert(count >= 2, "must be sentinel values, at least");
2388
2389 #ifdef ASSERT
2390 // must be sorted and unique; we do a binary search in find_pc_desc()
2391 int prev_offset = pcs[0].pc_offset();
2392 assert(prev_offset == PcDesc::lower_offset_limit,
2393 "must start with a sentinel");
2394 for (int i = 1; i < count; i++) {
2395 int this_offset = pcs[i].pc_offset();
2396 assert(this_offset > prev_offset, "offsets must be sorted");
2397 prev_offset = this_offset;
2398 }
2399 assert(prev_offset == PcDesc::upper_offset_limit,
2400 "must end with a sentinel");
2401 #endif //ASSERT
2402
2403 // Search for MethodHandle invokes and tag the nmethod.
2404 for (int i = 0; i < count; i++) {
2405 if (pcs[i].is_method_handle_invoke()) {
2406 set_has_method_handle_invokes(true);
2407 break;
2408 }
2409 }
2410 assert(has_method_handle_invokes() == (_deoptimize_mh_offset != -1), "must have deopt mh handler");
2411
2412 int size = count * sizeof(PcDesc);
2413 assert(scopes_pcs_size() >= size, "oob");
2414 memcpy(scopes_pcs_begin(), pcs, size);
2415
2416 // Adjust the final sentinel downward.
2417 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
2418 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
2419 last_pc->set_pc_offset(content_size() + 1);
2420 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
2421 // Fill any rounding gaps with copies of the last record.
2422 last_pc[1] = last_pc[0];
2423 }
2424 // The following assert could fail if sizeof(PcDesc) is not
2425 // an integral multiple of oopSize (the rounding term).
2426 // If it fails, change the logic to always allocate a multiple
2427 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
2428 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
2429 }
2430
2431 void nmethod::copy_scopes_data(u_char* buffer, int size) {
2432 assert(scopes_data_size() >= size, "oob");
2433 memcpy(scopes_data_begin(), buffer, size);
2434 }
2435
2436 // When using JVMCI the address might be off by the size of a call instruction.
2437 bool nmethod::is_deopt_entry(address pc) {
2438 return pc == deopt_handler_begin()
2439 #if INCLUDE_JVMCI
2440 || pc == (deopt_handler_begin() + NativeCall::instruction_size)
2441 #endif
2442 ;
2443 }
2444
2445 #ifdef ASSERT
2446 static PcDesc* linear_search(nmethod* nm, int pc_offset, bool approximate) {
2447 PcDesc* lower = nm->scopes_pcs_begin();
2448 PcDesc* upper = nm->scopes_pcs_end();
2449 lower += 1; // exclude initial sentinel
2450 PcDesc* res = NULL;
2451 for (PcDesc* p = lower; p < upper; p++) {
2452 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc
2453 if (match_desc(p, pc_offset, approximate)) {
2454 if (res == NULL)
2455 res = p;
2456 else
2457 res = (PcDesc*) badAddress;
2458 }
2459 }
2460 return res;
2461 }
2462 #endif
2463
2464
2465 // Finds a PcDesc with real-pc equal to "pc"
2466 PcDesc* nmethod::find_pc_desc_internal(address pc, bool approximate) {
2467 address base_address = code_begin();
2468 if ((pc < base_address) ||
2469 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
2470 return NULL; // PC is wildly out of range
2471 }
2472 int pc_offset = (int) (pc - base_address);
2473
2474 // Check the PcDesc cache if it contains the desired PcDesc
2475 // (This as an almost 100% hit rate.)
2476 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
2477 if (res != NULL) {
2478 assert(res == linear_search(this, pc_offset, approximate), "cache ok");
2479 return res;
2480 }
2481
2482 // Fallback algorithm: quasi-linear search for the PcDesc
2483 // Find the last pc_offset less than the given offset.
2484 // The successor must be the required match, if there is a match at all.
2485 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
2486 PcDesc* lower = scopes_pcs_begin();
2487 PcDesc* upper = scopes_pcs_end();
2488 upper -= 1; // exclude final sentinel
2489 if (lower >= upper) return NULL; // native method; no PcDescs at all
2490
2491 #define assert_LU_OK \
2492 /* invariant on lower..upper during the following search: */ \
2493 assert(lower->pc_offset() < pc_offset, "sanity"); \
2494 assert(upper->pc_offset() >= pc_offset, "sanity")
2495 assert_LU_OK;
2496
2497 // Use the last successful return as a split point.
2498 PcDesc* mid = _pc_desc_cache.last_pc_desc();
2499 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
2500 if (mid->pc_offset() < pc_offset) {
2501 lower = mid;
2502 } else {
2503 upper = mid;
2504 }
2505
2506 // Take giant steps at first (4096, then 256, then 16, then 1)
2507 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
2508 const int RADIX = (1 << LOG2_RADIX);
2509 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
2510 while ((mid = lower + step) < upper) {
2511 assert_LU_OK;
2512 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
2513 if (mid->pc_offset() < pc_offset) {
2514 lower = mid;
2515 } else {
2516 upper = mid;
2517 break;
2518 }
2519 }
2520 assert_LU_OK;
2521 }
2522
2523 // Sneak up on the value with a linear search of length ~16.
2524 while (true) {
2525 assert_LU_OK;
2526 mid = lower + 1;
2527 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
2528 if (mid->pc_offset() < pc_offset) {
2529 lower = mid;
2530 } else {
2531 upper = mid;
2532 break;
2533 }
2534 }
2535 #undef assert_LU_OK
2536
2537 if (match_desc(upper, pc_offset, approximate)) {
2538 assert(upper == linear_search(this, pc_offset, approximate), "search ok");
2539 _pc_desc_cache.add_pc_desc(upper);
2540 return upper;
2541 } else {
2542 assert(NULL == linear_search(this, pc_offset, approximate), "search ok");
2543 return NULL;
2544 }
2545 }
2546
2547
2548 void nmethod::check_all_dependencies(DepChange& changes) {
2549 // Checked dependencies are allocated into this ResourceMark
2550 ResourceMark rm;
2551
2552 // Turn off dependency tracing while actually testing dependencies.
2553 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) );
2554
2555 typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash,
2556 &DependencySignature::equals, 11027> DepTable;
2557
2558 DepTable* table = new DepTable();
2559
2560 // Iterate over live nmethods and check dependencies of all nmethods that are not
2561 // marked for deoptimization. A particular dependency is only checked once.
2562 NMethodIterator iter;
2563 while(iter.next()) {
2564 nmethod* nm = iter.method();
2565 // Only notify for live nmethods
2566 if (nm->is_alive() && !nm->is_marked_for_deoptimization()) {
2567 for (Dependencies::DepStream deps(nm); deps.next(); ) {
2568 // Construct abstraction of a dependency.
2569 DependencySignature* current_sig = new DependencySignature(deps);
2570
2571 // Determine if dependency is already checked. table->put(...) returns
2572 // 'true' if the dependency is added (i.e., was not in the hashtable).
2573 if (table->put(*current_sig, 1)) {
2574 if (deps.check_dependency() != NULL) {
2575 // Dependency checking failed. Print out information about the failed
2576 // dependency and finally fail with an assert. We can fail here, since
2577 // dependency checking is never done in a product build.
2578 tty->print_cr("Failed dependency:");
2579 changes.print();
2580 nm->print();
2581 nm->print_dependencies();
2582 assert(false, "Should have been marked for deoptimization");
2583 }
2584 }
2585 }
2586 }
2587 }
2588 }
2589
2590 bool nmethod::check_dependency_on(DepChange& changes) {
2591 // What has happened:
2592 // 1) a new class dependee has been added
2593 // 2) dependee and all its super classes have been marked
2594 bool found_check = false; // set true if we are upset
2595 for (Dependencies::DepStream deps(this); deps.next(); ) {
2596 // Evaluate only relevant dependencies.
2597 if (deps.spot_check_dependency_at(changes) != NULL) {
2598 found_check = true;
2599 NOT_DEBUG(break);
2600 }
2601 }
2602 return found_check;
2603 }
2604
2605 bool nmethod::is_evol_dependent_on(Klass* dependee) {
2606 InstanceKlass *dependee_ik = InstanceKlass::cast(dependee);
2607 Array<Method*>* dependee_methods = dependee_ik->methods();
2608 for (Dependencies::DepStream deps(this); deps.next(); ) {
2609 if (deps.type() == Dependencies::evol_method) {
2610 Method* method = deps.method_argument(0);
2611 for (int j = 0; j < dependee_methods->length(); j++) {
2612 if (dependee_methods->at(j) == method) {
2613 // RC_TRACE macro has an embedded ResourceMark
2614 RC_TRACE(0x01000000,
2615 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)",
2616 _method->method_holder()->external_name(),
2617 _method->name()->as_C_string(),
2618 _method->signature()->as_C_string(), compile_id(),
2619 method->method_holder()->external_name(),
2620 method->name()->as_C_string(),
2621 method->signature()->as_C_string()));
2622 if (TraceDependencies || LogCompilation)
2623 deps.log_dependency(dependee);
2624 return true;
2625 }
2626 }
2627 }
2628 }
2629 return false;
2630 }
2631
2632 // Called from mark_for_deoptimization, when dependee is invalidated.
2633 bool nmethod::is_dependent_on_method(Method* dependee) {
2634 for (Dependencies::DepStream deps(this); deps.next(); ) {
2635 if (deps.type() != Dependencies::evol_method)
2636 continue;
2637 Method* method = deps.method_argument(0);
2638 if (method == dependee) return true;
2639 }
2640 return false;
2641 }
2642
2643
2644 bool nmethod::is_patchable_at(address instr_addr) {
2645 assert(insts_contains(instr_addr), "wrong nmethod used");
2646 if (is_zombie()) {
2647 // a zombie may never be patched
2648 return false;
2649 }
2650 return true;
2651 }
2652
2653
2654 address nmethod::continuation_for_implicit_exception(address pc) {
2655 // Exception happened outside inline-cache check code => we are inside
2656 // an active nmethod => use cpc to determine a return address
2657 int exception_offset = pc - code_begin();
2658 int cont_offset = ImplicitExceptionTable(this).at( exception_offset );
2659 #ifdef ASSERT
2660 if (cont_offset == 0) {
2661 Thread* thread = ThreadLocalStorage::get_thread_slow();
2662 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
2663 HandleMark hm(thread);
2664 ResourceMark rm(thread);
2665 CodeBlob* cb = CodeCache::find_blob(pc);
2666 assert(cb != NULL && cb == this, "");
2667 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, pc);
2668 print();
2669 method()->print_codes();
2670 print_code();
2671 print_pcs();
2672 }
2673 #endif
2674 if (cont_offset == 0) {
2675 // Let the normal error handling report the exception
2676 return NULL;
2677 }
2678 return code_begin() + cont_offset;
2679 }
2680
2681
2682
2683 void nmethod_init() {
2684 // make sure you didn't forget to adjust the filler fields
2685 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
2686 }
2687
2688
2689 //-------------------------------------------------------------------------------------------
2690
2691
2692 // QQQ might we make this work from a frame??
2693 nmethodLocker::nmethodLocker(address pc) {
2694 CodeBlob* cb = CodeCache::find_blob(pc);
2695 guarantee(cb != NULL && cb->is_nmethod(), "bad pc for a nmethod found");
2696 _nm = (nmethod*)cb;
2697 lock_nmethod(_nm);
2698 }
2699
2700 // Only JvmtiDeferredEvent::compiled_method_unload_event()
2701 // should pass zombie_ok == true.
2702 void nmethodLocker::lock_nmethod(nmethod* nm, bool zombie_ok) {
2703 if (nm == NULL) return;
2704 Atomic::inc(&nm->_lock_count);
2705 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method");
2706 }
2707
2708 void nmethodLocker::unlock_nmethod(nmethod* nm) {
2709 if (nm == NULL) return;
2710 Atomic::dec(&nm->_lock_count);
2711 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock");
2712 }
2713
2714 // -----------------------------------------------------------------------------
2715 // nmethod::get_deopt_original_pc
2716 //
2717 // Return the original PC for the given PC if:
2718 // (a) the given PC belongs to a nmethod and
2719 // (b) it is a deopt PC
2720 address nmethod::get_deopt_original_pc(const frame* fr) {
2721 if (fr->cb() == NULL) return NULL;
2722
2723 nmethod* nm = fr->cb()->as_nmethod_or_null();
2724 if (nm != NULL && nm->is_deopt_pc(fr->pc()))
2725 return nm->get_original_pc(fr);
2726
2727 return NULL;
2728 }
2729
2730
2731 // -----------------------------------------------------------------------------
2732 // MethodHandle
2733
2734 bool nmethod::is_method_handle_return(address return_pc) {
2735 if (!has_method_handle_invokes()) return false;
2736 PcDesc* pd = pc_desc_at(return_pc);
2737 if (pd == NULL)
2738 return false;
2739 return pd->is_method_handle_invoke();
2740 }
2741
2742
2743 // -----------------------------------------------------------------------------
2744 // Verification
2745
2746 class VerifyOopsClosure: public OopClosure {
2747 nmethod* _nm;
2748 bool _ok;
2749 public:
2750 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
2751 bool ok() { return _ok; }
2752 virtual void do_oop(oop* p) {
2753 if ((*p) == NULL || (*p)->is_oop()) return;
2754 if (_ok) {
2755 _nm->print_nmethod(true);
2756 _ok = false;
2757 }
2758 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2759 (void *)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm));
2760 }
2761 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2762 };
2763
2764 void nmethod::verify() {
2765
2766 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant
2767 // seems odd.
2768
2769 if (is_zombie() || is_not_entrant() || is_unloaded())
2770 return;
2771
2772 // Make sure all the entry points are correctly aligned for patching.
2773 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
2774
2775 // assert(method()->is_oop(), "must be valid");
2776
2777 ResourceMark rm;
2778
2779 if (!CodeCache::contains(this)) {
2780 fatal(err_msg("nmethod at " INTPTR_FORMAT " not in zone", this));
2781 }
2782
2783 if(is_native_method() )
2784 return;
2785
2786 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
2787 if (nm != this) {
2788 fatal(err_msg("findNMethod did not find this nmethod (" INTPTR_FORMAT ")",
2789 this));
2790 }
2791
2792 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2793 if (! p->verify(this)) {
2794 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", this);
2795 }
2796 }
2797
2798 VerifyOopsClosure voc(this);
2799 oops_do(&voc);
2800 assert(voc.ok(), "embedded oops must be OK");
2801 verify_scavenge_root_oops();
2802
2803 verify_scopes();
2804 }
2805
2806
2807 void nmethod::verify_interrupt_point(address call_site) {
2808 // Verify IC only when nmethod installation is finished.
2809 bool is_installed = (method()->code() == this) // nmethod is in state 'in_use' and installed
2810 || !this->is_in_use(); // nmethod is installed, but not in 'in_use' state
2811 if (is_installed) {
2812 Thread *cur = Thread::current();
2813 if (CompiledIC_lock->owner() == cur ||
2814 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) &&
2815 SafepointSynchronize::is_at_safepoint())) {
2816 CompiledIC_at(this, call_site);
2817 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
2818 } else {
2819 MutexLocker ml_verify (CompiledIC_lock);
2820 CompiledIC_at(this, call_site);
2821 }
2822 }
2823
2824 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address());
2825 assert(pd != NULL, "PcDesc must exist");
2826 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(),
2827 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(),
2828 pd->return_oop());
2829 !sd->is_top(); sd = sd->sender()) {
2830 sd->verify();
2831 }
2832 }
2833
2834 void nmethod::verify_scopes() {
2835 if( !method() ) return; // Runtime stubs have no scope
2836 if (method()->is_native()) return; // Ignore stub methods.
2837 // iterate through all interrupt point
2838 // and verify the debug information is valid.
2839 RelocIterator iter((nmethod*)this);
2840 while (iter.next()) {
2841 address stub = NULL;
2842 switch (iter.type()) {
2843 case relocInfo::virtual_call_type:
2844 verify_interrupt_point(iter.addr());
2845 break;
2846 case relocInfo::opt_virtual_call_type:
2847 stub = iter.opt_virtual_call_reloc()->static_stub();
2848 verify_interrupt_point(iter.addr());
2849 break;
2850 case relocInfo::static_call_type:
2851 stub = iter.static_call_reloc()->static_stub();
2852 //verify_interrupt_point(iter.addr());
2853 break;
2854 case relocInfo::runtime_call_type:
2855 address destination = iter.reloc()->value();
2856 // Right now there is no way to find out which entries support
2857 // an interrupt point. It would be nice if we had this
2858 // information in a table.
2859 break;
2860 }
2861 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section");
2862 }
2863 }
2864
2865
2866 // -----------------------------------------------------------------------------
2867 // Non-product code
2868 #ifndef PRODUCT
2869
2870 class DebugScavengeRoot: public OopClosure {
2871 nmethod* _nm;
2872 bool _ok;
2873 public:
2874 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { }
2875 bool ok() { return _ok; }
2876 virtual void do_oop(oop* p) {
2877 if ((*p) == NULL || !(*p)->is_scavengable()) return;
2878 if (_ok) {
2879 _nm->print_nmethod(true);
2880 _ok = false;
2881 }
2882 tty->print_cr("*** scavengable oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2883 (void *)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm));
2884 (*p)->print();
2885 }
2886 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2887 };
2888
2889 void nmethod::verify_scavenge_root_oops() {
2890 if (UseG1GC) {
2891 return;
2892 }
2893
2894 if (!on_scavenge_root_list()) {
2895 // Actually look inside, to verify the claim that it's clean.
2896 DebugScavengeRoot debug_scavenge_root(this);
2897 oops_do(&debug_scavenge_root);
2898 if (!debug_scavenge_root.ok())
2899 fatal("found an unadvertised bad scavengable oop in the code cache");
2900 }
2901 assert(scavenge_root_not_marked(), "");
2902 }
2903
2904 #endif // PRODUCT
2905
2906 // Printing operations
2907
2908 void nmethod::print() const {
2909 ResourceMark rm;
2910 ttyLocker ttyl; // keep the following output all in one block
2911
2912 tty->print("Compiled method ");
2913
2914 if (is_compiled_by_c1()) {
2915 tty->print("(c1) ");
2916 } else if (is_compiled_by_c2()) {
2917 tty->print("(c2) ");
2918 } else if (is_compiled_by_shark()) {
2919 tty->print("(shark) ");
2920 } else if (is_compiled_by_jvmci()) {
2921 tty->print("(JVMCI) ");
2922 } else {
2923 tty->print("(nm) ");
2924 }
2925
2926 print_on(tty, NULL);
2927
2928 if (WizardMode) {
2929 tty->print("((nmethod*) " INTPTR_FORMAT ") ", this);
2930 tty->print(" for method " INTPTR_FORMAT , (address)method());
2931 tty->print(" { ");
2932 if (is_in_use()) tty->print("in_use ");
2933 if (is_not_entrant()) tty->print("not_entrant ");
2934 if (is_zombie()) tty->print("zombie ");
2935 if (is_unloaded()) tty->print("unloaded ");
2936 if (on_scavenge_root_list()) tty->print("scavenge_root ");
2937 tty->print_cr("}:");
2938 }
2939 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2940 (address)this,
2941 (address)this + size(),
2942 size());
2943 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2944 relocation_begin(),
2945 relocation_end(),
2946 relocation_size());
2947 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2948 consts_begin(),
2949 consts_end(),
2950 consts_size());
2951 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2952 insts_begin(),
2953 insts_end(),
2954 insts_size());
2955 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2956 stub_begin(),
2957 stub_end(),
2958 stub_size());
2959 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2960 oops_begin(),
2961 oops_end(),
2962 oops_size());
2963 if (metadata_size () > 0) tty->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2964 metadata_begin(),
2965 metadata_end(),
2966 metadata_size());
2967 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2968 scopes_data_begin(),
2969 scopes_data_end(),
2970 scopes_data_size());
2971 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2972 scopes_pcs_begin(),
2973 scopes_pcs_end(),
2974 scopes_pcs_size());
2975 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2976 dependencies_begin(),
2977 dependencies_end(),
2978 dependencies_size());
2979 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2980 handler_table_begin(),
2981 handler_table_end(),
2982 handler_table_size());
2983 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2984 nul_chk_table_begin(),
2985 nul_chk_table_end(),
2986 nul_chk_table_size());
2987 }
2988
2989 void nmethod::print_code() {
2990 HandleMark hm;
2991 ResourceMark m;
2992 Disassembler::decode(this);
2993 }
2994
2995
2996 #ifndef PRODUCT
2997
2998 void nmethod::print_scopes() {
2999 // Find the first pc desc for all scopes in the code and print it.
3000 ResourceMark rm;
3001 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
3002 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
3003 continue;
3004
3005 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
3006 while (sd != NULL) {
3007 sd->print_on(tty, p);
3008 sd = sd->sender();
3009 }
3010 }
3011 }
3012
3013 void nmethod::print_dependencies() {
3014 ResourceMark rm;
3015 ttyLocker ttyl; // keep the following output all in one block
3016 tty->print_cr("Dependencies:");
3017 for (Dependencies::DepStream deps(this); deps.next(); ) {
3018 deps.print_dependency();
3019 Klass* ctxk = deps.context_type();
3020 if (ctxk != NULL) {
3021 if (ctxk->oop_is_instance() && ((InstanceKlass*)ctxk)->is_dependent_nmethod(this)) {
3022 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name());
3023 }
3024 }
3025 deps.log_dependency(); // put it into the xml log also
3026 }
3027 }
3028
3029
3030 void nmethod::print_relocations() {
3031 ResourceMark m; // in case methods get printed via the debugger
3032 tty->print_cr("relocations:");
3033 RelocIterator iter(this);
3034 iter.print();
3035 if (UseRelocIndex) {
3036 jint* index_end = (jint*)relocation_end() - 1;
3037 jint index_size = *index_end;
3038 jint* index_start = (jint*)( (address)index_end - index_size );
3039 tty->print_cr(" index @" INTPTR_FORMAT ": index_size=%d", index_start, index_size);
3040 if (index_size > 0) {
3041 jint* ip;
3042 for (ip = index_start; ip+2 <= index_end; ip += 2)
3043 tty->print_cr(" (%d %d) addr=" INTPTR_FORMAT " @" INTPTR_FORMAT,
3044 ip[0],
3045 ip[1],
3046 header_end()+ip[0],
3047 relocation_begin()-1+ip[1]);
3048 for (; ip < index_end; ip++)
3049 tty->print_cr(" (%d ?)", ip[0]);
3050 tty->print_cr(" @" INTPTR_FORMAT ": index_size=%d", ip, *ip);
3051 ip++;
3052 tty->print_cr("reloc_end @" INTPTR_FORMAT ":", ip);
3053 }
3054 }
3055 }
3056
3057
3058 void nmethod::print_pcs() {
3059 ResourceMark m; // in case methods get printed via debugger
3060 tty->print_cr("pc-bytecode offsets:");
3061 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
3062 p->print(this);
3063 }
3064 }
3065
3066 #endif // PRODUCT
3067
3068 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
3069 RelocIterator iter(this, begin, end);
3070 bool have_one = false;
3071 while (iter.next()) {
3072 have_one = true;
3073 switch (iter.type()) {
3074 case relocInfo::none: return "no_reloc";
3075 case relocInfo::oop_type: {
3076 stringStream st;
3077 oop_Relocation* r = iter.oop_reloc();
3078 oop obj = r->oop_value();
3079 st.print("oop(");
3080 if (obj == NULL) st.print("NULL");
3081 else obj->print_value_on(&st);
3082 st.print(")");
3083 return st.as_string();
3084 }
3085 case relocInfo::metadata_type: {
3086 stringStream st;
3087 metadata_Relocation* r = iter.metadata_reloc();
3088 Metadata* obj = r->metadata_value();
3089 st.print("metadata(");
3090 if (obj == NULL) st.print("NULL");
3091 else obj->print_value_on(&st);
3092 st.print(")");
3093 return st.as_string();
3094 }
3095 case relocInfo::runtime_call_type: {
3096 stringStream st;
3097 st.print("runtime_call");
3098 runtime_call_Relocation* r = iter.runtime_call_reloc();
3099 address dest = r->destination();
3100 CodeBlob* cb = CodeCache::find_blob(dest);
3101 if (cb != NULL) {
3102 st.print(" %s", cb->name());
3103 }
3104 return st.as_string();
3105 }
3106 case relocInfo::virtual_call_type: return "virtual_call";
3107 case relocInfo::opt_virtual_call_type: return "optimized virtual_call";
3108 case relocInfo::static_call_type: return "static_call";
3109 case relocInfo::static_stub_type: return "static_stub";
3110 case relocInfo::external_word_type: return "external_word";
3111 case relocInfo::internal_word_type: return "internal_word";
3112 case relocInfo::section_word_type: return "section_word";
3113 case relocInfo::poll_type: return "poll";
3114 case relocInfo::poll_return_type: return "poll_return";
3115 case relocInfo::type_mask: return "type_bit_mask";
3116 }
3117 }
3118 return have_one ? "other" : NULL;
3119 }
3120
3121 // Return a the last scope in (begin..end]
3122 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
3123 PcDesc* p = pc_desc_near(begin+1);
3124 if (p != NULL && p->real_pc(this) <= end) {
3125 return new ScopeDesc(this, p->scope_decode_offset(),
3126 p->obj_decode_offset(), p->should_reexecute(), p->rethrow_exception(),
3127 p->return_oop());
3128 }
3129 return NULL;
3130 }
3131
3132 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const {
3133 if (block_begin == entry_point()) stream->print_cr("[Entry Point]");
3134 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]");
3135 if (JVMCI_ONLY(_exception_offset >= 0 &&) block_begin == exception_begin()) stream->print_cr("[Exception Handler]");
3136 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]");
3137 if (JVMCI_ONLY(_deoptimize_offset >= 0 &&) block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]");
3138
3139 if (has_method_handle_invokes())
3140 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]");
3141
3142 if (block_begin == consts_begin()) stream->print_cr("[Constants]");
3143
3144 if (block_begin == entry_point()) {
3145 methodHandle m = method();
3146 if (m.not_null()) {
3147 stream->print(" # ");
3148 m->print_value_on(stream);
3149 stream->cr();
3150 }
3151 if (m.not_null() && !is_osr_method()) {
3152 ResourceMark rm;
3153 int sizeargs = m->size_of_parameters();
3154 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
3155 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
3156 {
3157 int sig_index = 0;
3158 if (!m->is_static())
3159 sig_bt[sig_index++] = T_OBJECT; // 'this'
3160 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) {
3161 BasicType t = ss.type();
3162 sig_bt[sig_index++] = t;
3163 if (type2size[t] == 2) {
3164 sig_bt[sig_index++] = T_VOID;
3165 } else {
3166 assert(type2size[t] == 1, "size is 1 or 2");
3167 }
3168 }
3169 assert(sig_index == sizeargs, "");
3170 }
3171 const char* spname = "sp"; // make arch-specific?
3172 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false);
3173 int stack_slot_offset = this->frame_size() * wordSize;
3174 int tab1 = 14, tab2 = 24;
3175 int sig_index = 0;
3176 int arg_index = (m->is_static() ? 0 : -1);
3177 bool did_old_sp = false;
3178 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) {
3179 bool at_this = (arg_index == -1);
3180 bool at_old_sp = false;
3181 BasicType t = (at_this ? T_OBJECT : ss.type());
3182 assert(t == sig_bt[sig_index], "sigs in sync");
3183 if (at_this)
3184 stream->print(" # this: ");
3185 else
3186 stream->print(" # parm%d: ", arg_index);
3187 stream->move_to(tab1);
3188 VMReg fst = regs[sig_index].first();
3189 VMReg snd = regs[sig_index].second();
3190 if (fst->is_reg()) {
3191 stream->print("%s", fst->name());
3192 if (snd->is_valid()) {
3193 stream->print(":%s", snd->name());
3194 }
3195 } else if (fst->is_stack()) {
3196 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
3197 if (offset == stack_slot_offset) at_old_sp = true;
3198 stream->print("[%s+0x%x]", spname, offset);
3199 } else {
3200 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
3201 }
3202 stream->print(" ");
3203 stream->move_to(tab2);
3204 stream->print("= ");
3205 if (at_this) {
3206 m->method_holder()->print_value_on(stream);
3207 } else {
3208 bool did_name = false;
3209 if (!at_this && ss.is_object()) {
3210 Symbol* name = ss.as_symbol_or_null();
3211 if (name != NULL) {
3212 name->print_value_on(stream);
3213 did_name = true;
3214 }
3215 }
3216 if (!did_name)
3217 stream->print("%s", type2name(t));
3218 }
3219 if (at_old_sp) {
3220 stream->print(" (%s of caller)", spname);
3221 did_old_sp = true;
3222 }
3223 stream->cr();
3224 sig_index += type2size[t];
3225 arg_index += 1;
3226 if (!at_this) ss.next();
3227 }
3228 if (!did_old_sp) {
3229 stream->print(" # ");
3230 stream->move_to(tab1);
3231 stream->print("[%s+0x%x]", spname, stack_slot_offset);
3232 stream->print(" (%s of caller)", spname);
3233 stream->cr();
3234 }
3235 }
3236 }
3237 }
3238
3239 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) {
3240 // First, find an oopmap in (begin, end].
3241 // We use the odd half-closed interval so that oop maps and scope descs
3242 // which are tied to the byte after a call are printed with the call itself.
3243 address base = code_begin();
3244 ImmutableOopMapSet* oms = oop_maps();
3245 if (oms != NULL) {
3246 for (int i = 0, imax = oms->count(); i < imax; i++) {
3247 const ImmutableOopMapPair* pair = oms->pair_at(i);
3248 const ImmutableOopMap* om = pair->get_from(oms);
3249 address pc = base + pair->pc_offset();
3250 if (pc > begin) {
3251 if (pc <= end) {
3252 st->move_to(column);
3253 st->print("; ");
3254 om->print_on(st);
3255 }
3256 break;
3257 }
3258 }
3259 }
3260
3261 // Print any debug info present at this pc.
3262 ScopeDesc* sd = scope_desc_in(begin, end);
3263 if (sd != NULL) {
3264 st->move_to(column);
3265 if (sd->bci() == SynchronizationEntryBCI) {
3266 st->print(";*synchronization entry");
3267 } else {
3268 if (sd->method() == NULL) {
3269 st->print("method is NULL");
3270 } else if (sd->method()->is_native()) {
3271 st->print("method is native");
3272 } else {
3273 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci());
3274 st->print(";*%s", Bytecodes::name(bc));
3275 switch (bc) {
3276 case Bytecodes::_invokevirtual:
3277 case Bytecodes::_invokespecial:
3278 case Bytecodes::_invokestatic:
3279 case Bytecodes::_invokeinterface:
3280 {
3281 Bytecode_invoke invoke(sd->method(), sd->bci());
3282 st->print(" ");
3283 if (invoke.name() != NULL)
3284 invoke.name()->print_symbol_on(st);
3285 else
3286 st->print("<UNKNOWN>");
3287 break;
3288 }
3289 case Bytecodes::_getfield:
3290 case Bytecodes::_putfield:
3291 case Bytecodes::_getstatic:
3292 case Bytecodes::_putstatic:
3293 {
3294 Bytecode_field field(sd->method(), sd->bci());
3295 st->print(" ");
3296 if (field.name() != NULL)
3297 field.name()->print_symbol_on(st);
3298 else
3299 st->print("<UNKNOWN>");
3300 }
3301 }
3302 }
3303 st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop());
3304 }
3305
3306 // Print all scopes
3307 for (;sd != NULL; sd = sd->sender()) {
3308 st->move_to(column);
3309 st->print("; -");
3310 if (sd->method() == NULL) {
3311 st->print("method is NULL");
3312 } else {
3313 sd->method()->print_short_name(st);
3314 }
3315 int lineno = sd->method()->line_number_from_bci(sd->bci());
3316 if (lineno != -1) {
3317 st->print("@%d (line %d)", sd->bci(), lineno);
3318 } else {
3319 st->print("@%d", sd->bci());
3320 }
3321 st->cr();
3322 }
3323 }
3324
3325 // Print relocation information
3326 const char* str = reloc_string_for(begin, end);
3327 if (str != NULL) {
3328 if (sd != NULL) st->cr();
3329 st->move_to(column);
3330 st->print("; {%s}", str);
3331 }
3332 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin());
3333 if (cont_offset != 0) {
3334 st->move_to(column);
3335 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, code_begin() + cont_offset);
3336 }
3337
3338 }
3339
3340 #ifndef PRODUCT
3341
3342 void nmethod::print_value_on(outputStream* st) const {
3343 st->print("nmethod");
3344 print_on(st, NULL);
3345 }
3346
3347 void nmethod::print_calls(outputStream* st) {
3348 RelocIterator iter(this);
3349 while (iter.next()) {
3350 switch (iter.type()) {
3351 case relocInfo::virtual_call_type:
3352 case relocInfo::opt_virtual_call_type: {
3353 VerifyMutexLocker mc(CompiledIC_lock);
3354 CompiledIC_at(&iter)->print();
3355 break;
3356 }
3357 case relocInfo::static_call_type:
3358 st->print_cr("Static call at " INTPTR_FORMAT, iter.reloc()->addr());
3359 compiledStaticCall_at(iter.reloc())->print();
3360 break;
3361 }
3362 }
3363 }
3364
3365 void nmethod::print_handler_table() {
3366 ExceptionHandlerTable(this).print();
3367 }
3368
3369 void nmethod::print_nul_chk_table() {
3370 ImplicitExceptionTable(this).print(code_begin());
3371 }
3372
3373 void nmethod::print_statistics() {
3374 ttyLocker ttyl;
3375 if (xtty != NULL) xtty->head("statistics type='nmethod'");
3376 native_nmethod_stats.print_native_nmethod_stats();
3377 #ifdef COMPILER1
3378 c1_java_nmethod_stats.print_nmethod_stats("C1");
3379 #endif
3380 #ifdef COMPILER2
3381 c2_java_nmethod_stats.print_nmethod_stats("C2");
3382 #endif
3383 #if INCLUDE_JVMCI
3384 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI");
3385 #endif
3386 #ifdef SHARK
3387 shark_java_nmethod_stats.print_nmethod_stats("Shark");
3388 #endif
3389 unknown_java_nmethod_stats.print_nmethod_stats("Unknown");
3390 DebugInformationRecorder::print_statistics();
3391 #ifndef PRODUCT
3392 pc_nmethod_stats.print_pc_stats();
3393 #endif
3394 Dependencies::print_statistics();
3395 if (xtty != NULL) xtty->tail("statistics");
3396 }
3397
3398 #endif // !PRODUCT
3399
3400 #if INCLUDE_JVMCI
3401 char* nmethod::jvmci_installed_code_name(char* buf, size_t buflen) {
3402 if (!this->is_compiled_by_jvmci()) {
3403 return NULL;
3404 }
3405 oop installedCode = this->jvmci_installed_code();
3406 if (installedCode != NULL) {
3407 oop installedCodeName = NULL;
3408 if (installedCode->is_a(InstalledCode::klass())) {
3409 installedCodeName = InstalledCode::name(installedCode);
3410 }
3411 if (installedCodeName != NULL) {
3412 return java_lang_String::as_utf8_string(installedCodeName, buf, (int)buflen);
3413 } else {
3414 jio_snprintf(buf, buflen, "null");
3415 return buf;
3416 }
3417 }
3418 jio_snprintf(buf, buflen, "noInstalledCode");
3419 return buf;
3420 }
3421 #endif