1 /*
2 * Copyright (c) 1997, 2014, 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/nmethod.hpp"
30 #include "code/scopeDesc.hpp"
31 #include "compiler/abstractCompiler.hpp"
32 #include "compiler/compileBroker.hpp"
33 #include "compiler/compileLog.hpp"
34 #include "compiler/compilerOracle.hpp"
35 #include "compiler/disassembler.hpp"
36 #include "interpreter/bytecode.hpp"
37 #include "oops/methodData.hpp"
38 #include "prims/jvmtiRedefineClassesTrace.hpp"
39 #include "prims/jvmtiImpl.hpp"
40 #include "runtime/orderAccess.inline.hpp"
41 #include "runtime/sharedRuntime.hpp"
42 #include "runtime/sweeper.hpp"
43 #include "utilities/dtrace.hpp"
44 #include "utilities/events.hpp"
45 #include "utilities/xmlstream.hpp"
46 #include "evtrace/traceManager.hpp"
47 #ifdef SHARK
48 #include "shark/sharkCompiler.hpp"
49 #endif
50
51 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
52
53 unsigned char nmethod::_global_unloading_clock = 0;
54
55 #ifdef DTRACE_ENABLED
56
57 // Only bother with this argument setup if dtrace is available
58
59 #ifndef USDT2
60 HS_DTRACE_PROBE_DECL8(hotspot, compiled__method__load,
61 const char*, int, const char*, int, const char*, int, void*, size_t);
62
63 HS_DTRACE_PROBE_DECL6(hotspot, compiled__method__unload,
64 char*, int, char*, int, char*, int);
65
66 #define DTRACE_METHOD_UNLOAD_PROBE(method) \
67 { \
68 Method* m = (method); \
69 if (m != NULL) { \
70 Symbol* klass_name = m->klass_name(); \
71 Symbol* name = m->name(); \
72 Symbol* signature = m->signature(); \
73 HS_DTRACE_PROBE6(hotspot, compiled__method__unload, \
74 klass_name->bytes(), klass_name->utf8_length(), \
75 name->bytes(), name->utf8_length(), \
76 signature->bytes(), signature->utf8_length()); \
77 } \
78 }
79 #else /* USDT2 */
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 #endif /* USDT2 */
94
95 #else // ndef DTRACE_ENABLED
96
97 #define DTRACE_METHOD_UNLOAD_PROBE(method)
98
99 #endif
100
101 bool nmethod::is_compiled_by_c1() const {
102 if (compiler() == NULL) {
103 return false;
104 }
105 return compiler()->is_c1();
106 }
107 bool nmethod::is_compiled_by_c2() const {
108 if (compiler() == NULL) {
109 return false;
110 }
111 return compiler()->is_c2();
112 }
113 bool nmethod::is_compiled_by_shark() const {
114 if (compiler() == NULL) {
115 return false;
116 }
117 return compiler()->is_shark();
118 }
119
120
121
122 //---------------------------------------------------------------------------------
123 // NMethod statistics
124 // They are printed under various flags, including:
125 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation.
126 // (In the latter two cases, they like other stats are printed to the log only.)
127
128 #ifndef PRODUCT
129 // These variables are put into one block to reduce relocations
130 // and make it simpler to print from the debugger.
131 static
132 struct nmethod_stats_struct {
133 int nmethod_count;
134 int total_size;
135 int relocation_size;
136 int consts_size;
137 int insts_size;
138 int stub_size;
139 int scopes_data_size;
140 int scopes_pcs_size;
141 int dependencies_size;
142 int handler_table_size;
143 int nul_chk_table_size;
144 int oops_size;
145
146 void note_nmethod(nmethod* nm) {
147 nmethod_count += 1;
148 total_size += nm->size();
149 relocation_size += nm->relocation_size();
150 consts_size += nm->consts_size();
151 insts_size += nm->insts_size();
152 stub_size += nm->stub_size();
153 oops_size += nm->oops_size();
154 scopes_data_size += nm->scopes_data_size();
155 scopes_pcs_size += nm->scopes_pcs_size();
156 dependencies_size += nm->dependencies_size();
157 handler_table_size += nm->handler_table_size();
158 nul_chk_table_size += nm->nul_chk_table_size();
159 }
160 void print_nmethod_stats() {
161 if (nmethod_count == 0) return;
162 tty->print_cr("Statistics for %d bytecoded nmethods:", nmethod_count);
163 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size);
164 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size);
165 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size);
166 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size);
167 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size);
168 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size);
169 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size);
170 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size);
171 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size);
172 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size);
173 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size);
174 }
175
176 int native_nmethod_count;
177 int native_total_size;
178 int native_relocation_size;
179 int native_insts_size;
180 int native_oops_size;
181 void note_native_nmethod(nmethod* nm) {
182 native_nmethod_count += 1;
183 native_total_size += nm->size();
184 native_relocation_size += nm->relocation_size();
185 native_insts_size += nm->insts_size();
186 native_oops_size += nm->oops_size();
187 }
188 void print_native_nmethod_stats() {
189 if (native_nmethod_count == 0) return;
190 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count);
191 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size);
192 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size);
193 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size);
194 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size);
195 }
196
197 int pc_desc_resets; // number of resets (= number of caches)
198 int pc_desc_queries; // queries to nmethod::find_pc_desc
199 int pc_desc_approx; // number of those which have approximate true
200 int pc_desc_repeats; // number of _pc_descs[0] hits
201 int pc_desc_hits; // number of LRU cache hits
202 int pc_desc_tests; // total number of PcDesc examinations
203 int pc_desc_searches; // total number of quasi-binary search steps
204 int pc_desc_adds; // number of LUR cache insertions
205
206 void print_pc_stats() {
207 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query",
208 pc_desc_queries,
209 (double)(pc_desc_tests + pc_desc_searches)
210 / pc_desc_queries);
211 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d",
212 pc_desc_resets,
213 pc_desc_queries, pc_desc_approx,
214 pc_desc_repeats, pc_desc_hits,
215 pc_desc_tests, pc_desc_searches, pc_desc_adds);
216 }
217 } nmethod_stats;
218 #endif //PRODUCT
219
220
221 //---------------------------------------------------------------------------------
222
223
224 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) {
225 assert(pc != NULL, "Must be non null");
226 assert(exception.not_null(), "Must be non null");
227 assert(handler != NULL, "Must be non null");
228
229 _count = 0;
230 _exception_type = exception->klass();
231 _next = NULL;
232
233 add_address_and_handler(pc,handler);
234 }
235
236
237 address ExceptionCache::match(Handle exception, address pc) {
238 assert(pc != NULL,"Must be non null");
239 assert(exception.not_null(),"Must be non null");
240 if (exception->klass() == exception_type()) {
241 return (test_address(pc));
242 }
243
244 return NULL;
245 }
246
247
248 bool ExceptionCache::match_exception_with_space(Handle exception) {
249 assert(exception.not_null(),"Must be non null");
250 if (exception->klass() == exception_type() && count() < cache_size) {
251 return true;
252 }
253 return false;
254 }
255
256
257 address ExceptionCache::test_address(address addr) {
258 for (int i=0; i<count(); i++) {
259 if (pc_at(i) == addr) {
260 return handler_at(i);
261 }
262 }
263 return NULL;
264 }
265
266
267 bool ExceptionCache::add_address_and_handler(address addr, address handler) {
268 if (test_address(addr) == handler) return true;
269 if (count() < cache_size) {
270 set_pc_at(count(),addr);
271 set_handler_at(count(), handler);
272 increment_count();
273 return true;
274 }
275 return false;
276 }
277
278
279 // private method for handling exception cache
280 // These methods are private, and used to manipulate the exception cache
281 // directly.
282 ExceptionCache* nmethod::exception_cache_entry_for_exception(Handle exception) {
283 ExceptionCache* ec = exception_cache();
284 while (ec != NULL) {
285 if (ec->match_exception_with_space(exception)) {
286 return ec;
287 }
288 ec = ec->next();
289 }
290 return NULL;
291 }
292
293
294 //-----------------------------------------------------------------------------
295
296
297 // Helper used by both find_pc_desc methods.
298 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) {
299 NOT_PRODUCT(++nmethod_stats.pc_desc_tests);
300 if (!approximate)
301 return pc->pc_offset() == pc_offset;
302 else
303 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset();
304 }
305
306 void PcDescCache::reset_to(PcDesc* initial_pc_desc) {
307 if (initial_pc_desc == NULL) {
308 _pc_descs[0] = NULL; // native method; no PcDescs at all
309 return;
310 }
311 NOT_PRODUCT(++nmethod_stats.pc_desc_resets);
312 // reset the cache by filling it with benign (non-null) values
313 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel");
314 for (int i = 0; i < cache_size; i++)
315 _pc_descs[i] = initial_pc_desc;
316 }
317
318 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) {
319 NOT_PRODUCT(++nmethod_stats.pc_desc_queries);
320 NOT_PRODUCT(if (approximate) ++nmethod_stats.pc_desc_approx);
321
322 // Note: one might think that caching the most recently
323 // read value separately would be a win, but one would be
324 // wrong. When many threads are updating it, the cache
325 // line it's in would bounce between caches, negating
326 // any benefit.
327
328 // In order to prevent race conditions do not load cache elements
329 // repeatedly, but use a local copy:
330 PcDesc* res;
331
332 // Step one: Check the most recently added value.
333 res = _pc_descs[0];
334 if (res == NULL) return NULL; // native method; no PcDescs at all
335 if (match_desc(res, pc_offset, approximate)) {
336 NOT_PRODUCT(++nmethod_stats.pc_desc_repeats);
337 return res;
338 }
339
340 // Step two: Check the rest of the LRU cache.
341 for (int i = 1; i < cache_size; ++i) {
342 res = _pc_descs[i];
343 if (res->pc_offset() < 0) break; // optimization: skip empty cache
344 if (match_desc(res, pc_offset, approximate)) {
345 NOT_PRODUCT(++nmethod_stats.pc_desc_hits);
346 return res;
347 }
348 }
349
350 // Report failure.
351 return NULL;
352 }
353
354 void PcDescCache::add_pc_desc(PcDesc* pc_desc) {
355 NOT_PRODUCT(++nmethod_stats.pc_desc_adds);
356 // Update the LRU cache by shifting pc_desc forward.
357 for (int i = 0; i < cache_size; i++) {
358 PcDesc* next = _pc_descs[i];
359 _pc_descs[i] = pc_desc;
360 pc_desc = next;
361 }
362 }
363
364 // adjust pcs_size so that it is a multiple of both oopSize and
365 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple
366 // of oopSize, then 2*sizeof(PcDesc) is)
367 static int adjust_pcs_size(int pcs_size) {
368 int nsize = round_to(pcs_size, oopSize);
369 if ((nsize % sizeof(PcDesc)) != 0) {
370 nsize = pcs_size + sizeof(PcDesc);
371 }
372 assert((nsize % oopSize) == 0, "correct alignment");
373 return nsize;
374 }
375
376 //-----------------------------------------------------------------------------
377
378
379 void nmethod::add_exception_cache_entry(ExceptionCache* new_entry) {
380 assert(ExceptionCache_lock->owned_by_self(),"Must hold the ExceptionCache_lock");
381 assert(new_entry != NULL,"Must be non null");
382 assert(new_entry->next() == NULL, "Must be null");
383
384 if (exception_cache() != NULL) {
385 new_entry->set_next(exception_cache());
386 }
387 set_exception_cache(new_entry);
388 }
389
390 void nmethod::clean_exception_cache(BoolObjectClosure* is_alive) {
391 ExceptionCache* prev = NULL;
392 ExceptionCache* curr = exception_cache();
393
394 while (curr != NULL) {
395 ExceptionCache* next = curr->next();
396
397 Klass* ex_klass = curr->exception_type();
398 if (ex_klass != NULL && !ex_klass->is_loader_alive(is_alive)) {
399 if (prev == NULL) {
400 set_exception_cache(next);
401 } else {
402 prev->set_next(next);
403 }
404 delete curr;
405 // prev stays the same.
406 } else {
407 prev = curr;
408 }
409
410 curr = next;
411 }
412 }
413
414 // public method for accessing the exception cache
415 // These are the public access methods.
416 address nmethod::handler_for_exception_and_pc(Handle exception, address pc) {
417 // We never grab a lock to read the exception cache, so we may
418 // have false negatives. This is okay, as it can only happen during
419 // the first few exception lookups for a given nmethod.
420 ExceptionCache* ec = exception_cache();
421 while (ec != NULL) {
422 address ret_val;
423 if ((ret_val = ec->match(exception,pc)) != NULL) {
424 return ret_val;
425 }
426 ec = ec->next();
427 }
428 return NULL;
429 }
430
431
432 void nmethod::add_handler_for_exception_and_pc(Handle exception, address pc, address handler) {
433 // There are potential race conditions during exception cache updates, so we
434 // must own the ExceptionCache_lock before doing ANY modifications. Because
435 // we don't lock during reads, it is possible to have several threads attempt
436 // to update the cache with the same data. We need to check for already inserted
437 // copies of the current data before adding it.
438
439 MutexLocker ml(ExceptionCache_lock);
440 ExceptionCache* target_entry = exception_cache_entry_for_exception(exception);
441
442 if (target_entry == NULL || !target_entry->add_address_and_handler(pc,handler)) {
443 target_entry = new ExceptionCache(exception,pc,handler);
444 add_exception_cache_entry(target_entry);
445 }
446 }
447
448
449 //-------------end of code for ExceptionCache--------------
450
451
452 int nmethod::total_size() const {
453 return
454 consts_size() +
455 insts_size() +
456 stub_size() +
457 scopes_data_size() +
458 scopes_pcs_size() +
459 handler_table_size() +
460 nul_chk_table_size();
461 }
462
463 const char* nmethod::compile_kind() const {
464 if (is_osr_method()) return "osr";
465 if (method() != NULL && is_native_method()) return "c2n";
466 return NULL;
467 }
468
469 // Fill in default values for various flag fields
470 void nmethod::init_defaults() {
471 _state = in_use;
472 _unloading_clock = 0;
473 _marked_for_reclamation = 0;
474 _has_flushed_dependencies = 0;
475 _has_unsafe_access = 0;
476 _has_method_handle_invokes = 0;
477 _lazy_critical_native = 0;
478 _has_wide_vectors = 0;
479 _marked_for_deoptimization = 0;
480 _lock_count = 0;
481 _stack_traversal_mark = 0;
482 _unload_reported = false; // jvmti state
483
484 #ifdef ASSERT
485 _oops_are_stale = false;
486 #endif
487
488 _oops_do_mark_link = NULL;
489 _jmethod_id = NULL;
490 _osr_link = NULL;
491 if (UseG1GC) {
492 _unloading_next = NULL;
493 } else {
494 _scavenge_root_link = NULL;
495 }
496 _scavenge_root_state = 0;
497 _compiler = NULL;
498 #if INCLUDE_RTM_OPT
499 _rtm_state = NoRTM;
500 #endif
501 #ifdef HAVE_DTRACE_H
502 _trap_offset = 0;
503 #endif // def HAVE_DTRACE_H
504 }
505
506 nmethod* nmethod::new_native_nmethod(methodHandle method,
507 int compile_id,
508 CodeBuffer *code_buffer,
509 int vep_offset,
510 int frame_complete,
511 int frame_size,
512 ByteSize basic_lock_owner_sp_offset,
513 ByteSize basic_lock_sp_offset,
514 OopMapSet* oop_maps) {
515 code_buffer->finalize_oop_references(method);
516 // create nmethod
517 nmethod* nm = NULL;
518 {
519 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
520 int native_nmethod_size = allocation_size(code_buffer, sizeof(nmethod));
521 CodeOffsets offsets;
522 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
523 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
524 nm = new (native_nmethod_size) nmethod(method(), native_nmethod_size,
525 compile_id, &offsets,
526 code_buffer, frame_size,
527 basic_lock_owner_sp_offset,
528 basic_lock_sp_offset, oop_maps);
529 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_native_nmethod(nm));
530 if (PrintAssembly && nm != NULL) {
531 Disassembler::decode(nm);
532 }
533 }
534 // verify nmethod
535 debug_only(if (nm) nm->verify();) // might block
536
537 if (nm != NULL) {
538 nm->log_new_nmethod();
539 }
540
541 return nm;
542 }
543
544 #ifdef HAVE_DTRACE_H
545 nmethod* nmethod::new_dtrace_nmethod(methodHandle method,
546 CodeBuffer *code_buffer,
547 int vep_offset,
548 int trap_offset,
549 int frame_complete,
550 int frame_size) {
551 code_buffer->finalize_oop_references(method);
552 // create nmethod
553 nmethod* nm = NULL;
554 {
555 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
556 int nmethod_size = allocation_size(code_buffer, sizeof(nmethod));
557 CodeOffsets offsets;
558 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
559 offsets.set_value(CodeOffsets::Dtrace_trap, trap_offset);
560 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
561
562 nm = new (nmethod_size) nmethod(method(), nmethod_size,
563 &offsets, code_buffer, frame_size);
564
565 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_nmethod(nm));
566 if (PrintAssembly && nm != NULL) {
567 Disassembler::decode(nm);
568 }
569 }
570 // verify nmethod
571 debug_only(if (nm) nm->verify();) // might block
572
573 if (nm != NULL) {
574 nm->log_new_nmethod();
575 }
576
577 return nm;
578 }
579
580 #endif // def HAVE_DTRACE_H
581
582 nmethod* nmethod::new_nmethod(methodHandle method,
583 int compile_id,
584 int entry_bci,
585 CodeOffsets* offsets,
586 int orig_pc_offset,
587 DebugInformationRecorder* debug_info,
588 Dependencies* dependencies,
589 CodeBuffer* code_buffer, int frame_size,
590 OopMapSet* oop_maps,
591 ExceptionHandlerTable* handler_table,
592 ImplicitExceptionTable* nul_chk_table,
593 AbstractCompiler* compiler,
594 int comp_level
595 )
596 {
597 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
598 code_buffer->finalize_oop_references(method);
599 // create nmethod
600 nmethod* nm = NULL;
601 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
602 int nmethod_size =
603 allocation_size(code_buffer, sizeof(nmethod))
604 + adjust_pcs_size(debug_info->pcs_size())
605 + round_to(dependencies->size_in_bytes() , oopSize)
606 + round_to(handler_table->size_in_bytes(), oopSize)
607 + round_to(nul_chk_table->size_in_bytes(), oopSize)
608 + round_to(debug_info->data_size() , oopSize);
609
610 nm = new (nmethod_size)
611 nmethod(method(), nmethod_size, compile_id, entry_bci, offsets,
612 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size,
613 oop_maps,
614 handler_table,
615 nul_chk_table,
616 compiler,
617 comp_level);
618
619 if (nm != NULL) {
620 // To make dependency checking during class loading fast, record
621 // the nmethod dependencies in the classes it is dependent on.
622 // This allows the dependency checking code to simply walk the
623 // class hierarchy above the loaded class, checking only nmethods
624 // which are dependent on those classes. The slow way is to
625 // check every nmethod for dependencies which makes it linear in
626 // the number of methods compiled. For applications with a lot
627 // classes the slow way is too slow.
628 for (Dependencies::DepStream deps(nm); deps.next(); ) {
629 Klass* klass = deps.context_type();
630 if (klass == NULL) {
631 continue; // ignore things like evol_method
632 }
633
634 // record this nmethod as dependent on this klass
635 InstanceKlass::cast(klass)->add_dependent_nmethod(nm);
636 }
637 NOT_PRODUCT(nmethod_stats.note_nmethod(nm));
638 if (PrintAssembly || CompilerOracle::has_option_string(method, "PrintAssembly")) {
639 Disassembler::decode(nm);
640 }
641 }
642 }
643 // Do verification and logging outside CodeCache_lock.
644 if (nm != NULL) {
645 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
646 DEBUG_ONLY(nm->verify();)
647 nm->log_new_nmethod();
648 }
649 return nm;
650 }
651
652
653 // For native wrappers
654 nmethod::nmethod(
655 Method* method,
656 int nmethod_size,
657 int compile_id,
658 CodeOffsets* offsets,
659 CodeBuffer* code_buffer,
660 int frame_size,
661 ByteSize basic_lock_owner_sp_offset,
662 ByteSize basic_lock_sp_offset,
663 OopMapSet* oop_maps )
664 : CodeBlob("native nmethod", code_buffer, sizeof(nmethod),
665 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps),
666 _native_receiver_sp_offset(basic_lock_owner_sp_offset),
667 _native_basic_lock_sp_offset(basic_lock_sp_offset)
668 {
669 {
670 debug_only(No_Safepoint_Verifier nsv;)
671 assert_locked_or_safepoint(CodeCache_lock);
672
673 init_defaults();
674 _method = method;
675 _entry_bci = InvocationEntryBci;
676 // We have no exception handler or deopt handler make the
677 // values something that will never match a pc like the nmethod vtable entry
678 _exception_offset = 0;
679 _deoptimize_offset = 0;
680 _deoptimize_mh_offset = 0;
681 _orig_pc_offset = 0;
682
683 _consts_offset = data_offset();
684 _stub_offset = data_offset();
685 _oops_offset = data_offset();
686 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize);
687 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize);
688 _scopes_pcs_offset = _scopes_data_offset;
689 _dependencies_offset = _scopes_pcs_offset;
690 _handler_table_offset = _dependencies_offset;
691 _nul_chk_table_offset = _handler_table_offset;
692 _nmethod_end_offset = _nul_chk_table_offset;
693 _compile_id = compile_id;
694 _comp_level = CompLevel_none;
695 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
696 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
697 _osr_entry_point = NULL;
698 _exception_cache = NULL;
699 _pc_desc_cache.reset_to(NULL);
700 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
701
702 code_buffer->copy_values_to(this);
703 if (ScavengeRootsInCode) {
704 if (detect_scavenge_root_oops()) {
705 CodeCache::add_scavenge_root_nmethod(this);
706 }
707 Universe::heap()->register_nmethod(this);
708 }
709 debug_only(verify_scavenge_root_oops());
710 CodeCache::commit(this);
711 }
712
713 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
714 ttyLocker ttyl; // keep the following output all in one block
715 // This output goes directly to the tty, not the compiler log.
716 // To enable tools to match it up with the compilation activity,
717 // be sure to tag this tty output with the compile ID.
718 if (xtty != NULL) {
719 xtty->begin_head("print_native_nmethod");
720 xtty->method(_method);
721 xtty->stamp();
722 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
723 }
724 // print the header part first
725 print();
726 // then print the requested information
727 if (PrintNativeNMethods) {
728 print_code();
729 if (oop_maps != NULL) {
730 oop_maps->print();
731 }
732 }
733 if (PrintRelocations) {
734 print_relocations();
735 }
736 if (xtty != NULL) {
737 xtty->tail("print_native_nmethod");
738 }
739 }
740 }
741
742 // For dtrace wrappers
743 #ifdef HAVE_DTRACE_H
744 nmethod::nmethod(
745 Method* method,
746 int nmethod_size,
747 CodeOffsets* offsets,
748 CodeBuffer* code_buffer,
749 int frame_size)
750 : CodeBlob("dtrace nmethod", code_buffer, sizeof(nmethod),
751 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, NULL),
752 _native_receiver_sp_offset(in_ByteSize(-1)),
753 _native_basic_lock_sp_offset(in_ByteSize(-1))
754 {
755 {
756 debug_only(No_Safepoint_Verifier nsv;)
757 assert_locked_or_safepoint(CodeCache_lock);
758
759 init_defaults();
760 _method = method;
761 _entry_bci = InvocationEntryBci;
762 // We have no exception handler or deopt handler make the
763 // values something that will never match a pc like the nmethod vtable entry
764 _exception_offset = 0;
765 _deoptimize_offset = 0;
766 _deoptimize_mh_offset = 0;
767 _unwind_handler_offset = -1;
768 _trap_offset = offsets->value(CodeOffsets::Dtrace_trap);
769 _orig_pc_offset = 0;
770 _consts_offset = data_offset();
771 _stub_offset = data_offset();
772 _oops_offset = data_offset();
773 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize);
774 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize);
775 _scopes_pcs_offset = _scopes_data_offset;
776 _dependencies_offset = _scopes_pcs_offset;
777 _handler_table_offset = _dependencies_offset;
778 _nul_chk_table_offset = _handler_table_offset;
779 _nmethod_end_offset = _nul_chk_table_offset;
780 _compile_id = 0; // default
781 _comp_level = CompLevel_none;
782 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
783 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
784 _osr_entry_point = NULL;
785 _exception_cache = NULL;
786 _pc_desc_cache.reset_to(NULL);
787 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
788
789 code_buffer->copy_values_to(this);
790 if (ScavengeRootsInCode) {
791 if (detect_scavenge_root_oops()) {
792 CodeCache::add_scavenge_root_nmethod(this);
793 }
794 Universe::heap()->register_nmethod(this);
795 }
796 DEBUG_ONLY(verify_scavenge_root_oops();)
797 CodeCache::commit(this);
798 }
799
800 if (PrintNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
801 ttyLocker ttyl; // keep the following output all in one block
802 // This output goes directly to the tty, not the compiler log.
803 // To enable tools to match it up with the compilation activity,
804 // be sure to tag this tty output with the compile ID.
805 if (xtty != NULL) {
806 xtty->begin_head("print_dtrace_nmethod");
807 xtty->method(_method);
808 xtty->stamp();
809 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
810 }
811 // print the header part first
812 print();
813 // then print the requested information
814 if (PrintNMethods) {
815 print_code();
816 }
817 if (PrintRelocations) {
818 print_relocations();
819 }
820 if (xtty != NULL) {
821 xtty->tail("print_dtrace_nmethod");
822 }
823 }
824 }
825 #endif // def HAVE_DTRACE_H
826
827 void* nmethod::operator new(size_t size, int nmethod_size) throw() {
828 // Not critical, may return null if there is too little continuous memory
829 return CodeCache::allocate(nmethod_size);
830 }
831
832 nmethod::nmethod(
833 Method* method,
834 int nmethod_size,
835 int compile_id,
836 int entry_bci,
837 CodeOffsets* offsets,
838 int orig_pc_offset,
839 DebugInformationRecorder* debug_info,
840 Dependencies* dependencies,
841 CodeBuffer *code_buffer,
842 int frame_size,
843 OopMapSet* oop_maps,
844 ExceptionHandlerTable* handler_table,
845 ImplicitExceptionTable* nul_chk_table,
846 AbstractCompiler* compiler,
847 int comp_level
848 )
849 : CodeBlob("nmethod", code_buffer, sizeof(nmethod),
850 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps),
851 _native_receiver_sp_offset(in_ByteSize(-1)),
852 _native_basic_lock_sp_offset(in_ByteSize(-1))
853 {
854 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
855 {
856 debug_only(No_Safepoint_Verifier nsv;)
857 assert_locked_or_safepoint(CodeCache_lock);
858
859 init_defaults();
860 _method = method;
861 _entry_bci = entry_bci;
862 _compile_id = compile_id;
863 _comp_level = comp_level;
864 _compiler = compiler;
865 _orig_pc_offset = orig_pc_offset;
866 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
867
868 // Section offsets
869 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts());
870 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs());
871
872 // Exception handler and deopt handler are in the stub section
873 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set");
874 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set");
875 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
876 _deoptimize_offset = _stub_offset + offsets->value(CodeOffsets::Deopt);
877 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
878 _deoptimize_mh_offset = _stub_offset + offsets->value(CodeOffsets::DeoptMH);
879 } else {
880 _deoptimize_mh_offset = -1;
881 }
882 if (offsets->value(CodeOffsets::UnwindHandler) != -1) {
883 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler);
884 } else {
885 _unwind_handler_offset = -1;
886 }
887
888 _oops_offset = data_offset();
889 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize);
890 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize);
891
892 _scopes_pcs_offset = _scopes_data_offset + round_to(debug_info->data_size (), oopSize);
893 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
894 _handler_table_offset = _dependencies_offset + round_to(dependencies->size_in_bytes (), oopSize);
895 _nul_chk_table_offset = _handler_table_offset + round_to(handler_table->size_in_bytes(), oopSize);
896 _nmethod_end_offset = _nul_chk_table_offset + round_to(nul_chk_table->size_in_bytes(), oopSize);
897
898 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
899 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
900 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry);
901 _exception_cache = NULL;
902 _pc_desc_cache.reset_to(scopes_pcs_begin());
903
904 // Copy contents of ScopeDescRecorder to nmethod
905 code_buffer->copy_values_to(this);
906 debug_info->copy_to(this);
907 dependencies->copy_to(this);
908 if (ScavengeRootsInCode) {
909 if (detect_scavenge_root_oops()) {
910 CodeCache::add_scavenge_root_nmethod(this);
911 }
912 Universe::heap()->register_nmethod(this);
913 }
914 debug_only(verify_scavenge_root_oops());
915
916 CodeCache::commit(this);
917
918 // Copy contents of ExceptionHandlerTable to nmethod
919 handler_table->copy_to(this);
920 nul_chk_table->copy_to(this);
921
922 // we use the information of entry points to find out if a method is
923 // static or non static
924 assert(compiler->is_c2() ||
925 _method->is_static() == (entry_point() == _verified_entry_point),
926 " entry points must be same for static methods and vice versa");
927 }
928
929 bool printnmethods = PrintNMethods
930 || CompilerOracle::should_print(_method)
931 || CompilerOracle::has_option_string(_method, "PrintNMethods");
932 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
933 print_nmethod(printnmethods);
934 }
935 }
936
937
938 // Print a short set of xml attributes to identify this nmethod. The
939 // output should be embedded in some other element.
940 void nmethod::log_identity(xmlStream* log) const {
941 log->print(" compile_id='%d'", compile_id());
942 const char* nm_kind = compile_kind();
943 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind);
944 if (compiler() != NULL) {
945 log->print(" compiler='%s'", compiler()->name());
946 }
947 if (TieredCompilation) {
948 log->print(" level='%d'", comp_level());
949 }
950 }
951
952
953 #define LOG_OFFSET(log, name) \
954 if ((intptr_t)name##_end() - (intptr_t)name##_begin()) \
955 log->print(" " XSTR(name) "_offset='%d'" , \
956 (intptr_t)name##_begin() - (intptr_t)this)
957
958
959 void nmethod::log_new_nmethod() const {
960 if (LogCompilation && xtty != NULL) {
961 ttyLocker ttyl;
962 HandleMark hm;
963 xtty->begin_elem("nmethod");
964 log_identity(xtty);
965 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", code_begin(), size());
966 xtty->print(" address='" INTPTR_FORMAT "'", (intptr_t) this);
967
968 LOG_OFFSET(xtty, relocation);
969 LOG_OFFSET(xtty, consts);
970 LOG_OFFSET(xtty, insts);
971 LOG_OFFSET(xtty, stub);
972 LOG_OFFSET(xtty, scopes_data);
973 LOG_OFFSET(xtty, scopes_pcs);
974 LOG_OFFSET(xtty, dependencies);
975 LOG_OFFSET(xtty, handler_table);
976 LOG_OFFSET(xtty, nul_chk_table);
977 LOG_OFFSET(xtty, oops);
978
979 xtty->method(method());
980 xtty->stamp();
981 xtty->end_elem();
982 }
983 }
984
985 #undef LOG_OFFSET
986
987
988 // Print out more verbose output usually for a newly created nmethod.
989 void nmethod::print_on(outputStream* st, const char* msg) const {
990 if (st != NULL) {
991 ttyLocker ttyl;
992 if (WizardMode) {
993 CompileTask::print_compilation(st, this, msg, /*short_form:*/ true);
994 st->print_cr(" (" INTPTR_FORMAT ")", this);
995 } else {
996 CompileTask::print_compilation(st, this, msg, /*short_form:*/ false);
997 }
998 }
999 }
1000
1001
1002 void nmethod::print_nmethod(bool printmethod) {
1003 ttyLocker ttyl; // keep the following output all in one block
1004 if (xtty != NULL) {
1005 xtty->begin_head("print_nmethod");
1006 xtty->stamp();
1007 xtty->end_head();
1008 }
1009 // print the header part first
1010 print();
1011 // then print the requested information
1012 if (printmethod) {
1013 print_code();
1014 print_pcs();
1015 if (oop_maps()) {
1016 oop_maps()->print();
1017 }
1018 }
1019 if (PrintDebugInfo) {
1020 print_scopes();
1021 }
1022 if (PrintRelocations) {
1023 print_relocations();
1024 }
1025 if (PrintDependencies) {
1026 print_dependencies();
1027 }
1028 if (PrintExceptionHandlers) {
1029 print_handler_table();
1030 print_nul_chk_table();
1031 }
1032 if (xtty != NULL) {
1033 xtty->tail("print_nmethod");
1034 }
1035 }
1036
1037
1038 // Promote one word from an assembly-time handle to a live embedded oop.
1039 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
1040 if (handle == NULL ||
1041 // As a special case, IC oops are initialized to 1 or -1.
1042 handle == (jobject) Universe::non_oop_word()) {
1043 (*dest) = (oop) handle;
1044 } else {
1045 (*dest) = JNIHandles::resolve_non_null(handle);
1046 }
1047 }
1048
1049
1050 // Have to have the same name because it's called by a template
1051 void nmethod::copy_values(GrowableArray<jobject>* array) {
1052 int length = array->length();
1053 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
1054 oop* dest = oops_begin();
1055 for (int index = 0 ; index < length; index++) {
1056 initialize_immediate_oop(&dest[index], array->at(index));
1057 }
1058
1059 // Now we can fix up all the oops in the code. We need to do this
1060 // in the code because the assembler uses jobjects as placeholders.
1061 // The code and relocations have already been initialized by the
1062 // CodeBlob constructor, so it is valid even at this early point to
1063 // iterate over relocations and patch the code.
1064 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true);
1065 }
1066
1067 void nmethod::copy_values(GrowableArray<Metadata*>* array) {
1068 int length = array->length();
1069 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough");
1070 Metadata** dest = metadata_begin();
1071 for (int index = 0 ; index < length; index++) {
1072 dest[index] = array->at(index);
1073 }
1074 }
1075
1076 bool nmethod::is_at_poll_return(address pc) {
1077 RelocIterator iter(this, pc, pc+1);
1078 while (iter.next()) {
1079 if (iter.type() == relocInfo::poll_return_type)
1080 return true;
1081 }
1082 return false;
1083 }
1084
1085
1086 bool nmethod::is_at_poll_or_poll_return(address pc) {
1087 RelocIterator iter(this, pc, pc+1);
1088 while (iter.next()) {
1089 relocInfo::relocType t = iter.type();
1090 if (t == relocInfo::poll_return_type || t == relocInfo::poll_type)
1091 return true;
1092 }
1093 return false;
1094 }
1095
1096
1097 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) {
1098 // re-patch all oop-bearing instructions, just in case some oops moved
1099 RelocIterator iter(this, begin, end);
1100 while (iter.next()) {
1101 if (iter.type() == relocInfo::oop_type) {
1102 oop_Relocation* reloc = iter.oop_reloc();
1103 if (initialize_immediates && reloc->oop_is_immediate()) {
1104 oop* dest = reloc->oop_addr();
1105 initialize_immediate_oop(dest, (jobject) *dest);
1106 }
1107 // Refresh the oop-related bits of this instruction.
1108 reloc->fix_oop_relocation();
1109 } else if (iter.type() == relocInfo::metadata_type) {
1110 metadata_Relocation* reloc = iter.metadata_reloc();
1111 reloc->fix_metadata_relocation();
1112 }
1113 }
1114 }
1115
1116
1117 void nmethod::verify_oop_relocations() {
1118 // Ensure sure that the code matches the current oop values
1119 RelocIterator iter(this, NULL, NULL);
1120 while (iter.next()) {
1121 if (iter.type() == relocInfo::oop_type) {
1122 oop_Relocation* reloc = iter.oop_reloc();
1123 if (!reloc->oop_is_immediate()) {
1124 reloc->verify_oop_relocation();
1125 }
1126 }
1127 }
1128 }
1129
1130
1131 ScopeDesc* nmethod::scope_desc_at(address pc) {
1132 PcDesc* pd = pc_desc_at(pc);
1133 guarantee(pd != NULL, "scope must be present");
1134 return new ScopeDesc(this, pd->scope_decode_offset(),
1135 pd->obj_decode_offset(), pd->should_reexecute(),
1136 pd->return_oop());
1137 }
1138
1139
1140 void nmethod::clear_inline_caches() {
1141 assert(SafepointSynchronize::is_at_safepoint(), "cleaning of IC's only allowed at safepoint");
1142 if (is_zombie()) {
1143 return;
1144 }
1145
1146 RelocIterator iter(this);
1147 while (iter.next()) {
1148 iter.reloc()->clear_inline_cache();
1149 }
1150 }
1151
1152 // Clear ICStubs of all compiled ICs
1153 void nmethod::clear_ic_stubs() {
1154 assert_locked_or_safepoint(CompiledIC_lock);
1155 RelocIterator iter(this);
1156 while(iter.next()) {
1157 if (iter.type() == relocInfo::virtual_call_type) {
1158 CompiledIC* ic = CompiledIC_at(&iter);
1159 ic->clear_ic_stub();
1160 }
1161 }
1162 }
1163
1164
1165 void nmethod::cleanup_inline_caches() {
1166 assert_locked_or_safepoint(CompiledIC_lock);
1167
1168 // If the method is not entrant or zombie then a JMP is plastered over the
1169 // first few bytes. If an oop in the old code was there, that oop
1170 // should not get GC'd. Skip the first few bytes of oops on
1171 // not-entrant methods.
1172 address low_boundary = verified_entry_point();
1173 if (!is_in_use()) {
1174 low_boundary += NativeJump::instruction_size;
1175 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1176 // This means that the low_boundary is going to be a little too high.
1177 // This shouldn't matter, since oops of non-entrant methods are never used.
1178 // In fact, why are we bothering to look at oops in a non-entrant method??
1179 }
1180
1181 // Find all calls in an nmethod and clear the ones that point to non-entrant,
1182 // zombie and unloaded nmethods.
1183 ResourceMark rm;
1184 RelocIterator iter(this, low_boundary);
1185 while(iter.next()) {
1186 switch(iter.type()) {
1187 case relocInfo::virtual_call_type:
1188 case relocInfo::opt_virtual_call_type: {
1189 CompiledIC *ic = CompiledIC_at(&iter);
1190 // Ok, to lookup references to zombies here
1191 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
1192 if( cb != NULL && cb->is_nmethod() ) {
1193 nmethod* nm = (nmethod*)cb;
1194 // Clean inline caches pointing to zombie, non-entrant and unloaded methods
1195 if (!nm->is_in_use() || (nm->method()->code() != nm)) ic->set_to_clean(is_alive());
1196 }
1197 break;
1198 }
1199 case relocInfo::static_call_type: {
1200 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
1201 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
1202 if( cb != NULL && cb->is_nmethod() ) {
1203 nmethod* nm = (nmethod*)cb;
1204 // Clean inline caches pointing to zombie, non-entrant and unloaded methods
1205 if (!nm->is_in_use() || (nm->method()->code() != nm)) csc->set_to_clean();
1206 }
1207 break;
1208 }
1209 }
1210 }
1211 }
1212
1213 void nmethod::verify_clean_inline_caches() {
1214 assert_locked_or_safepoint(CompiledIC_lock);
1215
1216 // If the method is not entrant or zombie then a JMP is plastered over the
1217 // first few bytes. If an oop in the old code was there, that oop
1218 // should not get GC'd. Skip the first few bytes of oops on
1219 // not-entrant methods.
1220 address low_boundary = verified_entry_point();
1221 if (!is_in_use()) {
1222 low_boundary += NativeJump::instruction_size;
1223 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1224 // This means that the low_boundary is going to be a little too high.
1225 // This shouldn't matter, since oops of non-entrant methods are never used.
1226 // In fact, why are we bothering to look at oops in a non-entrant method??
1227 }
1228
1229 ResourceMark rm;
1230 RelocIterator iter(this, low_boundary);
1231 while(iter.next()) {
1232 switch(iter.type()) {
1233 case relocInfo::virtual_call_type:
1234 case relocInfo::opt_virtual_call_type: {
1235 CompiledIC *ic = CompiledIC_at(&iter);
1236 // Ok, to lookup references to zombies here
1237 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
1238 if( cb != NULL && cb->is_nmethod() ) {
1239 nmethod* nm = (nmethod*)cb;
1240 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
1241 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1242 assert(ic->is_clean(), "IC should be clean");
1243 }
1244 }
1245 break;
1246 }
1247 case relocInfo::static_call_type: {
1248 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
1249 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
1250 if( cb != NULL && cb->is_nmethod() ) {
1251 nmethod* nm = (nmethod*)cb;
1252 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
1253 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1254 assert(csc->is_clean(), "IC should be clean");
1255 }
1256 }
1257 break;
1258 }
1259 }
1260 }
1261 }
1262
1263 int nmethod::verify_icholder_relocations() {
1264 int count = 0;
1265
1266 RelocIterator iter(this);
1267 while(iter.next()) {
1268 if (iter.type() == relocInfo::virtual_call_type) {
1269 if (CompiledIC::is_icholder_call_site(iter.virtual_call_reloc())) {
1270 CompiledIC *ic = CompiledIC_at(&iter);
1271 if (TraceCompiledIC) {
1272 tty->print("noticed icholder " INTPTR_FORMAT " ", p2i(ic->cached_icholder()));
1273 ic->print();
1274 }
1275 assert(ic->cached_icholder() != NULL, "must be non-NULL");
1276 count++;
1277 }
1278 }
1279 }
1280
1281 return count;
1282 }
1283
1284 // This is a private interface with the sweeper.
1285 void nmethod::mark_as_seen_on_stack() {
1286 assert(is_alive(), "Must be an alive method");
1287 // Set the traversal mark to ensure that the sweeper does 2
1288 // cleaning passes before moving to zombie.
1289 set_stack_traversal_mark(NMethodSweeper::traversal_count());
1290 }
1291
1292 // Tell if a non-entrant method can be converted to a zombie (i.e.,
1293 // there are no activations on the stack, not in use by the VM,
1294 // and not in use by the ServiceThread)
1295 bool nmethod::can_convert_to_zombie() {
1296 assert(is_not_entrant(), "must be a non-entrant method");
1297
1298 // Since the nmethod sweeper only does partial sweep the sweeper's traversal
1299 // count can be greater than the stack traversal count before it hits the
1300 // nmethod for the second time.
1301 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count() &&
1302 !is_locked_by_vm();
1303 }
1304
1305 void nmethod::inc_decompile_count() {
1306 if (!is_compiled_by_c2()) return;
1307 // Could be gated by ProfileTraps, but do not bother...
1308 Method* m = method();
1309 if (m == NULL) return;
1310 MethodData* mdo = m->method_data();
1311 if (mdo == NULL) return;
1312 // There is a benign race here. See comments in methodData.hpp.
1313 mdo->inc_decompile_count();
1314 }
1315
1316 void nmethod::increase_unloading_clock() {
1317 _global_unloading_clock++;
1318 if (_global_unloading_clock == 0) {
1319 // _nmethods are allocated with _unloading_clock == 0,
1320 // so 0 is never used as a clock value.
1321 _global_unloading_clock = 1;
1322 }
1323 }
1324
1325 void nmethod::set_unloading_clock(unsigned char unloading_clock) {
1326 OrderAccess::release_store((volatile jubyte*)&_unloading_clock, unloading_clock);
1327 }
1328
1329 unsigned char nmethod::unloading_clock() {
1330 return (unsigned char)OrderAccess::load_acquire((volatile jubyte*)&_unloading_clock);
1331 }
1332
1333 void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) {
1334
1335 post_compiled_method_unload();
1336
1337 // Since this nmethod is being unloaded, make sure that dependencies
1338 // recorded in instanceKlasses get flushed and pass non-NULL closure to
1339 // indicate that this work is being done during a GC.
1340 assert(Universe::heap()->is_gc_active(), "should only be called during gc");
1341 assert(is_alive != NULL, "Should be non-NULL");
1342 // A non-NULL is_alive closure indicates that this is being called during GC.
1343 flush_dependencies(is_alive);
1344
1345 // Break cycle between nmethod & method
1346 if (TraceClassUnloading && WizardMode) {
1347 tty->print_cr("[Class unloading: Making nmethod " INTPTR_FORMAT
1348 " unloadable], Method*(" INTPTR_FORMAT
1349 "), cause(" INTPTR_FORMAT ")",
1350 this, (address)_method, (address)cause);
1351 if (!Universe::heap()->is_gc_active())
1352 cause->klass()->print();
1353 }
1354 // Unlink the osr method, so we do not look this up again
1355 if (is_osr_method()) {
1356 invalidate_osr_method();
1357 }
1358 // If _method is already NULL the Method* is about to be unloaded,
1359 // so we don't have to break the cycle. Note that it is possible to
1360 // have the Method* live here, in case we unload the nmethod because
1361 // it is pointing to some oop (other than the Method*) being unloaded.
1362 if (_method != NULL) {
1363 // OSR methods point to the Method*, but the Method* does not
1364 // point back!
1365 if (_method->code() == this) {
1366 _method->clear_code(); // Break a cycle
1367 }
1368 _method = NULL; // Clear the method of this dead nmethod
1369 }
1370 // Make the class unloaded - i.e., change state and notify sweeper
1371 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
1372 if (is_in_use()) {
1373 // Transitioning directly from live to unloaded -- so
1374 // we need to force a cache clean-up; remember this
1375 // for later on.
1376 CodeCache::set_needs_cache_clean(true);
1377 }
1378
1379 // Unregister must be done before the state change
1380 Universe::heap()->unregister_nmethod(this);
1381
1382 _state = unloaded;
1383
1384 // Log the unloading.
1385 log_state_change();
1386
1387 // The Method* is gone at this point
1388 assert(_method == NULL, "Tautology");
1389
1390 set_osr_link(NULL);
1391 //set_scavenge_root_link(NULL); // done by prune_scavenge_root_nmethods
1392 NMethodSweeper::report_state_change(this);
1393 }
1394
1395 void nmethod::invalidate_osr_method() {
1396 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
1397 // Remove from list of active nmethods
1398 if (method() != NULL)
1399 method()->method_holder()->remove_osr_nmethod(this);
1400 // Set entry as invalid
1401 _entry_bci = InvalidOSREntryBci;
1402 }
1403
1404 void nmethod::log_state_change() const {
1405 if (LogCompilation) {
1406 if (xtty != NULL) {
1407 ttyLocker ttyl; // keep the following output all in one block
1408 if (_state == unloaded) {
1409 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'",
1410 os::current_thread_id());
1411 } else {
1412 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s",
1413 os::current_thread_id(),
1414 (_state == zombie ? " zombie='1'" : ""));
1415 }
1416 log_identity(xtty);
1417 xtty->stamp();
1418 xtty->end_elem();
1419 }
1420 }
1421 if (PrintCompilation && _state != unloaded) {
1422 print_on(tty, _state == zombie ? "made zombie" : "made not entrant");
1423 }
1424 }
1425
1426 /**
1427 * Common functionality for both make_not_entrant and make_zombie
1428 */
1429 bool nmethod::make_not_entrant_or_zombie(unsigned int state) {
1430 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant");
1431 assert(!is_zombie(), "should not already be a zombie");
1432
1433 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below.
1434 nmethodLocker nml(this);
1435 methodHandle the_method(method());
1436 No_Safepoint_Verifier nsv;
1437
1438 // during patching, depending on the nmethod state we must notify the GC that
1439 // code has been unloaded, unregistering it. We cannot do this right while
1440 // holding the Patching_lock because we need to use the CodeCache_lock. This
1441 // would be prone to deadlocks.
1442 // This flag is used to remember whether we need to later lock and unregister.
1443 bool nmethod_needs_unregister = false;
1444
1445 {
1446 // invalidate osr nmethod before acquiring the patching lock since
1447 // they both acquire leaf locks and we don't want a deadlock.
1448 // This logic is equivalent to the logic below for patching the
1449 // verified entry point of regular methods.
1450 if (is_osr_method()) {
1451 // this effectively makes the osr nmethod not entrant
1452 invalidate_osr_method();
1453 }
1454
1455 // Enter critical section. Does not block for safepoint.
1456 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1457
1458 if (_state == state) {
1459 // another thread already performed this transition so nothing
1460 // to do, but return false to indicate this.
1461 return false;
1462 }
1463
1464 // The caller can be calling the method statically or through an inline
1465 // cache call.
1466 if (!is_osr_method() && !is_not_entrant()) {
1467 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
1468 SharedRuntime::get_handle_wrong_method_stub());
1469 }
1470
1471 if (is_in_use()) {
1472 // It's a true state change, so mark the method as decompiled.
1473 // Do it only for transition from alive.
1474 inc_decompile_count();
1475 }
1476
1477 // If the state is becoming a zombie, signal to unregister the nmethod with
1478 // the heap.
1479 // This nmethod may have already been unloaded during a full GC.
1480 if ((state == zombie) && !is_unloaded()) {
1481 nmethod_needs_unregister = true;
1482 }
1483
1484 // Must happen before state change. Otherwise we have a race condition in
1485 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately
1486 // transition its state from 'not_entrant' to 'zombie' without having to wait
1487 // for stack scanning.
1488 if (state == not_entrant) {
1489 mark_as_seen_on_stack();
1490 OrderAccess::storestore();
1491 }
1492
1493 // Change state
1494 _state = state;
1495
1496 // Log the transition once
1497 log_state_change();
1498
1499 // Remove nmethod from method.
1500 // We need to check if both the _code and _from_compiled_code_entry_point
1501 // refer to this nmethod because there is a race in setting these two fields
1502 // in Method* as seen in bugid 4947125.
1503 // If the vep() points to the zombie nmethod, the memory for the nmethod
1504 // could be flushed and the compiler and vtable stubs could still call
1505 // through it.
1506 if (method() != NULL && (method()->code() == this ||
1507 method()->from_compiled_entry() == verified_entry_point())) {
1508 HandleMark hm;
1509 method()->clear_code();
1510 }
1511 } // leave critical region under Patching_lock
1512
1513 // When the nmethod becomes zombie it is no longer alive so the
1514 // dependencies must be flushed. nmethods in the not_entrant
1515 // state will be flushed later when the transition to zombie
1516 // happens or they get unloaded.
1517 if (state == zombie) {
1518 {
1519 // Flushing dependecies must be done before any possible
1520 // safepoint can sneak in, otherwise the oops used by the
1521 // dependency logic could have become stale.
1522 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1523 if (nmethod_needs_unregister) {
1524 Universe::heap()->unregister_nmethod(this);
1525 }
1526 flush_dependencies(NULL);
1527 }
1528
1529 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload
1530 // event and it hasn't already been reported for this nmethod then
1531 // report it now. The event may have been reported earilier if the GC
1532 // marked it for unloading). JvmtiDeferredEventQueue support means
1533 // we no longer go to a safepoint here.
1534 post_compiled_method_unload();
1535
1536 #ifdef ASSERT
1537 // It's no longer safe to access the oops section since zombie
1538 // nmethods aren't scanned for GC.
1539 _oops_are_stale = true;
1540 #endif
1541 // the Method may be reclaimed by class unloading now that the
1542 // nmethod is in zombie state
1543 set_method(NULL);
1544 } else {
1545 assert(state == not_entrant, "other cases may need to be handled differently");
1546 }
1547
1548 if (TraceCreateZombies) {
1549 tty->print_cr("nmethod <" INTPTR_FORMAT "> code made %s", this, (state == not_entrant) ? "not entrant" : "zombie");
1550 }
1551
1552 NMethodSweeper::report_state_change(this);
1553 return true;
1554 }
1555
1556 void nmethod::flush() {
1557 // Note that there are no valid oops in the nmethod anymore.
1558 assert(is_zombie() || (is_osr_method() && is_unloaded()), "must be a zombie method");
1559 assert(is_marked_for_reclamation() || (is_osr_method() && is_unloaded()), "must be marked for reclamation");
1560
1561 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed");
1562 assert_locked_or_safepoint(CodeCache_lock);
1563
1564 // completely deallocate this method
1565 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, this);
1566 if (PrintMethodFlushing) {
1567 tty->print_cr("*flushing nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT "/Free CodeCache:" SIZE_FORMAT "Kb",
1568 _compile_id, this, CodeCache::nof_blobs(), CodeCache::unallocated_capacity()/1024);
1569 }
1570
1571 // We need to deallocate any ExceptionCache data.
1572 // Note that we do not need to grab the nmethod lock for this, it
1573 // better be thread safe if we're disposing of it!
1574 ExceptionCache* ec = exception_cache();
1575 set_exception_cache(NULL);
1576 while(ec != NULL) {
1577 ExceptionCache* next = ec->next();
1578 delete ec;
1579 ec = next;
1580 }
1581
1582 if (on_scavenge_root_list()) {
1583 CodeCache::drop_scavenge_root_nmethod(this);
1584 }
1585
1586 #ifdef SHARK
1587 ((SharkCompiler *) compiler())->free_compiled_method(insts_begin());
1588 #endif // SHARK
1589
1590 ((CodeBlob*)(this))->flush();
1591
1592 CodeCache::free(this);
1593 }
1594
1595
1596 //
1597 // Notify all classes this nmethod is dependent on that it is no
1598 // longer dependent. This should only be called in two situations.
1599 // First, when a nmethod transitions to a zombie all dependents need
1600 // to be clear. Since zombification happens at a safepoint there's no
1601 // synchronization issues. The second place is a little more tricky.
1602 // During phase 1 of mark sweep class unloading may happen and as a
1603 // result some nmethods may get unloaded. In this case the flushing
1604 // of dependencies must happen during phase 1 since after GC any
1605 // dependencies in the unloaded nmethod won't be updated, so
1606 // traversing the dependency information in unsafe. In that case this
1607 // function is called with a non-NULL argument and this function only
1608 // notifies instanceKlasses that are reachable
1609
1610 void nmethod::flush_dependencies(BoolObjectClosure* is_alive) {
1611 assert_locked_or_safepoint(CodeCache_lock);
1612 assert(Universe::heap()->is_gc_active() == (is_alive != NULL),
1613 "is_alive is non-NULL if and only if we are called during GC");
1614 if (!has_flushed_dependencies()) {
1615 set_has_flushed_dependencies();
1616 for (Dependencies::DepStream deps(this); deps.next(); ) {
1617 Klass* klass = deps.context_type();
1618 if (klass == NULL) continue; // ignore things like evol_method
1619
1620 // During GC the is_alive closure is non-NULL, and is used to
1621 // determine liveness of dependees that need to be updated.
1622 if (is_alive == NULL || klass->is_loader_alive(is_alive)) {
1623 // The GC defers deletion of this entry, since there might be multiple threads
1624 // iterating over the _dependencies graph. Other call paths are single-threaded
1625 // and may delete it immediately.
1626 bool delete_immediately = is_alive == NULL;
1627 InstanceKlass::cast(klass)->remove_dependent_nmethod(this, delete_immediately);
1628 }
1629 }
1630 }
1631 }
1632
1633
1634 // If this oop is not live, the nmethod can be unloaded.
1635 bool nmethod::can_unload(BoolObjectClosure* is_alive, oop* root, bool unloading_occurred) {
1636 assert(root != NULL, "just checking");
1637 oop obj = *root;
1638 if (obj == NULL || is_alive->do_object_b(obj)) {
1639 return false;
1640 }
1641
1642 // If ScavengeRootsInCode is true, an nmethod might be unloaded
1643 // simply because one of its constant oops has gone dead.
1644 // No actual classes need to be unloaded in order for this to occur.
1645 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading");
1646 make_unloaded(is_alive, obj);
1647 return true;
1648 }
1649
1650 // ------------------------------------------------------------------
1651 // post_compiled_method_load_event
1652 // new method for install_code() path
1653 // Transfer information from compilation to jvmti
1654 void nmethod::post_compiled_method_load_event() {
1655
1656 Method* moop = method();
1657 #ifndef USDT2
1658 HS_DTRACE_PROBE8(hotspot, compiled__method__load,
1659 moop->klass_name()->bytes(),
1660 moop->klass_name()->utf8_length(),
1661 moop->name()->bytes(),
1662 moop->name()->utf8_length(),
1663 moop->signature()->bytes(),
1664 moop->signature()->utf8_length(),
1665 insts_begin(), insts_size());
1666 #else /* USDT2 */
1667 HOTSPOT_COMPILED_METHOD_LOAD(
1668 (char *) moop->klass_name()->bytes(),
1669 moop->klass_name()->utf8_length(),
1670 (char *) moop->name()->bytes(),
1671 moop->name()->utf8_length(),
1672 (char *) moop->signature()->bytes(),
1673 moop->signature()->utf8_length(),
1674 insts_begin(), insts_size());
1675 #endif /* USDT2 */
1676
1677 if (JvmtiExport::should_post_compiled_method_load() ||
1678 JvmtiExport::should_post_compiled_method_unload()) {
1679 get_and_cache_jmethod_id();
1680 }
1681
1682 if (JvmtiExport::should_post_compiled_method_load()) {
1683 // Let the Service thread (which is a real Java thread) post the event
1684 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1685 JvmtiDeferredEventQueue::enqueue(
1686 JvmtiDeferredEvent::compiled_method_load_event(this));
1687 }
1688 }
1689
1690 jmethodID nmethod::get_and_cache_jmethod_id() {
1691 if (_jmethod_id == NULL) {
1692 // Cache the jmethod_id since it can no longer be looked up once the
1693 // method itself has been marked for unloading.
1694 _jmethod_id = method()->jmethod_id();
1695 }
1696 return _jmethod_id;
1697 }
1698
1699 void nmethod::post_compiled_method_unload() {
1700 if (unload_reported()) {
1701 // During unloading we transition to unloaded and then to zombie
1702 // and the unloading is reported during the first transition.
1703 return;
1704 }
1705
1706 assert(_method != NULL && !is_unloaded(), "just checking");
1707
1708 if (EnableEventTracing) {
1709 TraceManager::nmethod_is_unloading(this);
1710 }
1711
1712 DTRACE_METHOD_UNLOAD_PROBE(method());
1713
1714 // If a JVMTI agent has enabled the CompiledMethodUnload event then
1715 // post the event. Sometime later this nmethod will be made a zombie
1716 // by the sweeper but the Method* will not be valid at that point.
1717 // If the _jmethod_id is null then no load event was ever requested
1718 // so don't bother posting the unload. The main reason for this is
1719 // that the jmethodID is a weak reference to the Method* so if
1720 // it's being unloaded there's no way to look it up since the weak
1721 // ref will have been cleared.
1722 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) {
1723 assert(!unload_reported(), "already unloaded");
1724 JvmtiDeferredEvent event =
1725 JvmtiDeferredEvent::compiled_method_unload_event(this,
1726 _jmethod_id, insts_begin());
1727 if (SafepointSynchronize::is_at_safepoint()) {
1728 // Don't want to take the queueing lock. Add it as pending and
1729 // it will get enqueued later.
1730 JvmtiDeferredEventQueue::add_pending_event(event);
1731 } else {
1732 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1733 JvmtiDeferredEventQueue::enqueue(event);
1734 }
1735 }
1736
1737 // The JVMTI CompiledMethodUnload event can be enabled or disabled at
1738 // any time. As the nmethod is being unloaded now we mark it has
1739 // having the unload event reported - this will ensure that we don't
1740 // attempt to report the event in the unlikely scenario where the
1741 // event is enabled at the time the nmethod is made a zombie.
1742 set_unload_reported();
1743 }
1744
1745 void static clean_ic_if_metadata_is_dead(CompiledIC *ic, BoolObjectClosure *is_alive, bool mark_on_stack) {
1746 if (ic->is_icholder_call()) {
1747 // The only exception is compiledICHolder oops which may
1748 // yet be marked below. (We check this further below).
1749 CompiledICHolder* cichk_oop = ic->cached_icholder();
1750
1751 if (mark_on_stack) {
1752 Metadata::mark_on_stack(cichk_oop->holder_method());
1753 Metadata::mark_on_stack(cichk_oop->holder_klass());
1754 }
1755
1756 if (cichk_oop->holder_method()->method_holder()->is_loader_alive(is_alive) &&
1757 cichk_oop->holder_klass()->is_loader_alive(is_alive)) {
1758 return;
1759 }
1760 } else {
1761 Metadata* ic_oop = ic->cached_metadata();
1762 if (ic_oop != NULL) {
1763 if (mark_on_stack) {
1764 Metadata::mark_on_stack(ic_oop);
1765 }
1766
1767 if (ic_oop->is_klass()) {
1768 if (((Klass*)ic_oop)->is_loader_alive(is_alive)) {
1769 return;
1770 }
1771 } else if (ic_oop->is_method()) {
1772 if (((Method*)ic_oop)->method_holder()->is_loader_alive(is_alive)) {
1773 return;
1774 }
1775 } else {
1776 ShouldNotReachHere();
1777 }
1778 }
1779 }
1780
1781 ic->set_to_clean();
1782 }
1783
1784 // This is called at the end of the strong tracing/marking phase of a
1785 // GC to unload an nmethod if it contains otherwise unreachable
1786 // oops.
1787
1788 void nmethod::do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred) {
1789 // Make sure the oop's ready to receive visitors
1790 assert(!is_zombie() && !is_unloaded(),
1791 "should not call follow on zombie or unloaded nmethod");
1792
1793 // If the method is not entrant then a JMP is plastered over the
1794 // first few bytes. If an oop in the old code was there, that oop
1795 // should not get GC'd. Skip the first few bytes of oops on
1796 // not-entrant methods.
1797 address low_boundary = verified_entry_point();
1798 if (is_not_entrant()) {
1799 low_boundary += NativeJump::instruction_size;
1800 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1801 // (See comment above.)
1802 }
1803
1804 // The RedefineClasses() API can cause the class unloading invariant
1805 // to no longer be true. See jvmtiExport.hpp for details.
1806 // Also, leave a debugging breadcrumb in local flag.
1807 bool a_class_was_redefined = JvmtiExport::has_redefined_a_class();
1808 if (a_class_was_redefined) {
1809 // This set of the unloading_occurred flag is done before the
1810 // call to post_compiled_method_unload() so that the unloading
1811 // of this nmethod is reported.
1812 unloading_occurred = true;
1813 }
1814
1815 // Exception cache
1816 clean_exception_cache(is_alive);
1817
1818 // If class unloading occurred we first iterate over all inline caches and
1819 // clear ICs where the cached oop is referring to an unloaded klass or method.
1820 // The remaining live cached oops will be traversed in the relocInfo::oop_type
1821 // iteration below.
1822 if (unloading_occurred) {
1823 RelocIterator iter(this, low_boundary);
1824 while(iter.next()) {
1825 if (iter.type() == relocInfo::virtual_call_type) {
1826 CompiledIC *ic = CompiledIC_at(&iter);
1827 clean_ic_if_metadata_is_dead(ic, is_alive, false);
1828 }
1829 }
1830 }
1831
1832 // Compiled code
1833 {
1834 RelocIterator iter(this, low_boundary);
1835 while (iter.next()) {
1836 if (iter.type() == relocInfo::oop_type) {
1837 oop_Relocation* r = iter.oop_reloc();
1838 // In this loop, we must only traverse those oops directly embedded in
1839 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1840 assert(1 == (r->oop_is_immediate()) +
1841 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1842 "oop must be found in exactly one place");
1843 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1844 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) {
1845 return;
1846 }
1847 }
1848 }
1849 }
1850 }
1851
1852
1853 // Scopes
1854 for (oop* p = oops_begin(); p < oops_end(); p++) {
1855 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1856 if (can_unload(is_alive, p, unloading_occurred)) {
1857 return;
1858 }
1859 }
1860
1861 // Ensure that all metadata is still alive
1862 verify_metadata_loaders(low_boundary, is_alive);
1863 }
1864
1865 template <class CompiledICorStaticCall>
1866 static bool clean_if_nmethod_is_unloaded(CompiledICorStaticCall *ic, address addr, BoolObjectClosure *is_alive, nmethod* from) {
1867 // Ok, to lookup references to zombies here
1868 CodeBlob *cb = CodeCache::find_blob_unsafe(addr);
1869 if (cb != NULL && cb->is_nmethod()) {
1870 nmethod* nm = (nmethod*)cb;
1871
1872 if (nm->unloading_clock() != nmethod::global_unloading_clock()) {
1873 // The nmethod has not been processed yet.
1874 return true;
1875 }
1876
1877 // Clean inline caches pointing to both zombie and not_entrant methods
1878 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1879 ic->set_to_clean();
1880 assert(ic->is_clean(), err_msg("nmethod " PTR_FORMAT "not clean %s", from, from->method()->name_and_sig_as_C_string()));
1881 }
1882 }
1883
1884 return false;
1885 }
1886
1887 static bool clean_if_nmethod_is_unloaded(CompiledIC *ic, BoolObjectClosure *is_alive, nmethod* from) {
1888 return clean_if_nmethod_is_unloaded(ic, ic->ic_destination(), is_alive, from);
1889 }
1890
1891 static bool clean_if_nmethod_is_unloaded(CompiledStaticCall *csc, BoolObjectClosure *is_alive, nmethod* from) {
1892 return clean_if_nmethod_is_unloaded(csc, csc->destination(), is_alive, from);
1893 }
1894
1895 bool nmethod::unload_if_dead_at(RelocIterator* iter_at_oop, BoolObjectClosure *is_alive, bool unloading_occurred) {
1896 assert(iter_at_oop->type() == relocInfo::oop_type, "Wrong relocation type");
1897
1898 oop_Relocation* r = iter_at_oop->oop_reloc();
1899 // Traverse those oops directly embedded in the code.
1900 // Other oops (oop_index>0) are seen as part of scopes_oops.
1901 assert(1 == (r->oop_is_immediate()) +
1902 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1903 "oop must be found in exactly one place");
1904 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1905 // Unload this nmethod if the oop is dead.
1906 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) {
1907 return true;;
1908 }
1909 }
1910
1911 return false;
1912 }
1913
1914 void nmethod::mark_metadata_on_stack_at(RelocIterator* iter_at_metadata) {
1915 assert(iter_at_metadata->type() == relocInfo::metadata_type, "Wrong relocation type");
1916
1917 metadata_Relocation* r = iter_at_metadata->metadata_reloc();
1918 // In this metadata, we must only follow those metadatas directly embedded in
1919 // the code. Other metadatas (oop_index>0) are seen as part of
1920 // the metadata section below.
1921 assert(1 == (r->metadata_is_immediate()) +
1922 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
1923 "metadata must be found in exactly one place");
1924 if (r->metadata_is_immediate() && r->metadata_value() != NULL) {
1925 Metadata* md = r->metadata_value();
1926 if (md != _method) Metadata::mark_on_stack(md);
1927 }
1928 }
1929
1930 void nmethod::mark_metadata_on_stack_non_relocs() {
1931 // Visit the metadata section
1932 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
1933 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops
1934 Metadata* md = *p;
1935 Metadata::mark_on_stack(md);
1936 }
1937
1938 // Visit metadata not embedded in the other places.
1939 if (_method != NULL) Metadata::mark_on_stack(_method);
1940 }
1941
1942 bool nmethod::do_unloading_parallel(BoolObjectClosure* is_alive, bool unloading_occurred) {
1943 ResourceMark rm;
1944
1945 // Make sure the oop's ready to receive visitors
1946 assert(!is_zombie() && !is_unloaded(),
1947 "should not call follow on zombie or unloaded nmethod");
1948
1949 // If the method is not entrant then a JMP is plastered over the
1950 // first few bytes. If an oop in the old code was there, that oop
1951 // should not get GC'd. Skip the first few bytes of oops on
1952 // not-entrant methods.
1953 address low_boundary = verified_entry_point();
1954 if (is_not_entrant()) {
1955 low_boundary += NativeJump::instruction_size;
1956 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1957 // (See comment above.)
1958 }
1959
1960 // The RedefineClasses() API can cause the class unloading invariant
1961 // to no longer be true. See jvmtiExport.hpp for details.
1962 // Also, leave a debugging breadcrumb in local flag.
1963 bool a_class_was_redefined = JvmtiExport::has_redefined_a_class();
1964 if (a_class_was_redefined) {
1965 // This set of the unloading_occurred flag is done before the
1966 // call to post_compiled_method_unload() so that the unloading
1967 // of this nmethod is reported.
1968 unloading_occurred = true;
1969 }
1970
1971 // When class redefinition is used all metadata in the CodeCache has to be recorded,
1972 // so that unused "previous versions" can be purged. Since walking the CodeCache can
1973 // be expensive, the "mark on stack" is piggy-backed on this parallel unloading code.
1974 bool mark_metadata_on_stack = a_class_was_redefined;
1975
1976 // Exception cache
1977 clean_exception_cache(is_alive);
1978
1979 bool is_unloaded = false;
1980 bool postponed = false;
1981
1982 RelocIterator iter(this, low_boundary);
1983 while(iter.next()) {
1984
1985 switch (iter.type()) {
1986
1987 case relocInfo::virtual_call_type:
1988 if (unloading_occurred) {
1989 // If class unloading occurred we first iterate over all inline caches and
1990 // clear ICs where the cached oop is referring to an unloaded klass or method.
1991 clean_ic_if_metadata_is_dead(CompiledIC_at(&iter), is_alive, mark_metadata_on_stack);
1992 }
1993
1994 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
1995 break;
1996
1997 case relocInfo::opt_virtual_call_type:
1998 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
1999 break;
2000
2001 case relocInfo::static_call_type:
2002 postponed |= clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this);
2003 break;
2004
2005 case relocInfo::oop_type:
2006 if (!is_unloaded) {
2007 is_unloaded = unload_if_dead_at(&iter, is_alive, unloading_occurred);
2008 }
2009 break;
2010
2011 case relocInfo::metadata_type:
2012 if (mark_metadata_on_stack) {
2013 mark_metadata_on_stack_at(&iter);
2014 }
2015 }
2016 }
2017
2018 if (mark_metadata_on_stack) {
2019 mark_metadata_on_stack_non_relocs();
2020 }
2021
2022 if (is_unloaded) {
2023 return postponed;
2024 }
2025
2026 // Scopes
2027 for (oop* p = oops_begin(); p < oops_end(); p++) {
2028 if (*p == Universe::non_oop_word()) continue; // skip non-oops
2029 if (can_unload(is_alive, p, unloading_occurred)) {
2030 is_unloaded = true;
2031 break;
2032 }
2033 }
2034
2035 if (is_unloaded) {
2036 return postponed;
2037 }
2038
2039 // Ensure that all metadata is still alive
2040 verify_metadata_loaders(low_boundary, is_alive);
2041
2042 return postponed;
2043 }
2044
2045 void nmethod::do_unloading_parallel_postponed(BoolObjectClosure* is_alive, bool unloading_occurred) {
2046 ResourceMark rm;
2047
2048 // Make sure the oop's ready to receive visitors
2049 assert(!is_zombie(),
2050 "should not call follow on zombie nmethod");
2051
2052 // If the method is not entrant then a JMP is plastered over the
2053 // first few bytes. If an oop in the old code was there, that oop
2054 // should not get GC'd. Skip the first few bytes of oops on
2055 // not-entrant methods.
2056 address low_boundary = verified_entry_point();
2057 if (is_not_entrant()) {
2058 low_boundary += NativeJump::instruction_size;
2059 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
2060 // (See comment above.)
2061 }
2062
2063 RelocIterator iter(this, low_boundary);
2064 while(iter.next()) {
2065
2066 switch (iter.type()) {
2067
2068 case relocInfo::virtual_call_type:
2069 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
2070 break;
2071
2072 case relocInfo::opt_virtual_call_type:
2073 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
2074 break;
2075
2076 case relocInfo::static_call_type:
2077 clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this);
2078 break;
2079 }
2080 }
2081 }
2082
2083 #ifdef ASSERT
2084
2085 class CheckClass : AllStatic {
2086 static BoolObjectClosure* _is_alive;
2087
2088 // Check class_loader is alive for this bit of metadata.
2089 static void check_class(Metadata* md) {
2090 Klass* klass = NULL;
2091 if (md->is_klass()) {
2092 klass = ((Klass*)md);
2093 } else if (md->is_method()) {
2094 klass = ((Method*)md)->method_holder();
2095 } else if (md->is_methodData()) {
2096 klass = ((MethodData*)md)->method()->method_holder();
2097 } else {
2098 md->print();
2099 ShouldNotReachHere();
2100 }
2101 assert(klass->is_loader_alive(_is_alive), "must be alive");
2102 }
2103 public:
2104 static void do_check_class(BoolObjectClosure* is_alive, nmethod* nm) {
2105 assert(SafepointSynchronize::is_at_safepoint(), "this is only ok at safepoint");
2106 _is_alive = is_alive;
2107 nm->metadata_do(check_class);
2108 }
2109 };
2110
2111 // This is called during a safepoint so can use static data
2112 BoolObjectClosure* CheckClass::_is_alive = NULL;
2113 #endif // ASSERT
2114
2115
2116 // Processing of oop references should have been sufficient to keep
2117 // all strong references alive. Any weak references should have been
2118 // cleared as well. Visit all the metadata and ensure that it's
2119 // really alive.
2120 void nmethod::verify_metadata_loaders(address low_boundary, BoolObjectClosure* is_alive) {
2121 #ifdef ASSERT
2122 RelocIterator iter(this, low_boundary);
2123 while (iter.next()) {
2124 // static_stub_Relocations may have dangling references to
2125 // Method*s so trim them out here. Otherwise it looks like
2126 // compiled code is maintaining a link to dead metadata.
2127 address static_call_addr = NULL;
2128 if (iter.type() == relocInfo::opt_virtual_call_type) {
2129 CompiledIC* cic = CompiledIC_at(&iter);
2130 if (!cic->is_call_to_interpreted()) {
2131 static_call_addr = iter.addr();
2132 }
2133 } else if (iter.type() == relocInfo::static_call_type) {
2134 CompiledStaticCall* csc = compiledStaticCall_at(iter.reloc());
2135 if (!csc->is_call_to_interpreted()) {
2136 static_call_addr = iter.addr();
2137 }
2138 }
2139 if (static_call_addr != NULL) {
2140 RelocIterator sciter(this, low_boundary);
2141 while (sciter.next()) {
2142 if (sciter.type() == relocInfo::static_stub_type &&
2143 sciter.static_stub_reloc()->static_call() == static_call_addr) {
2144 sciter.static_stub_reloc()->clear_inline_cache();
2145 }
2146 }
2147 }
2148 }
2149 // Check that the metadata embedded in the nmethod is alive
2150 CheckClass::do_check_class(is_alive, this);
2151 #endif
2152 }
2153
2154
2155 // Iterate over metadata calling this function. Used by RedefineClasses
2156 void nmethod::metadata_do(void f(Metadata*)) {
2157 address low_boundary = verified_entry_point();
2158 if (is_not_entrant()) {
2159 low_boundary += NativeJump::instruction_size;
2160 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
2161 // (See comment above.)
2162 }
2163 {
2164 // Visit all immediate references that are embedded in the instruction stream.
2165 RelocIterator iter(this, low_boundary);
2166 while (iter.next()) {
2167 if (iter.type() == relocInfo::metadata_type ) {
2168 metadata_Relocation* r = iter.metadata_reloc();
2169 // In this metadata, we must only follow those metadatas directly embedded in
2170 // the code. Other metadatas (oop_index>0) are seen as part of
2171 // the metadata section below.
2172 assert(1 == (r->metadata_is_immediate()) +
2173 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
2174 "metadata must be found in exactly one place");
2175 if (r->metadata_is_immediate() && r->metadata_value() != NULL) {
2176 Metadata* md = r->metadata_value();
2177 f(md);
2178 }
2179 } else if (iter.type() == relocInfo::virtual_call_type) {
2180 // Check compiledIC holders associated with this nmethod
2181 CompiledIC *ic = CompiledIC_at(&iter);
2182 if (ic->is_icholder_call()) {
2183 CompiledICHolder* cichk = ic->cached_icholder();
2184 f(cichk->holder_method());
2185 f(cichk->holder_klass());
2186 } else {
2187 Metadata* ic_oop = ic->cached_metadata();
2188 if (ic_oop != NULL) {
2189 f(ic_oop);
2190 }
2191 }
2192 }
2193 }
2194 }
2195
2196 // Visit the metadata section
2197 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
2198 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops
2199 Metadata* md = *p;
2200 f(md);
2201 }
2202
2203 // Visit metadata not embedded in the other places.
2204 if (_method != NULL) f(_method);
2205 }
2206
2207 void nmethod::oops_do(OopClosure* f, bool allow_zombie) {
2208 // make sure the oops ready to receive visitors
2209 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod");
2210 assert(!is_unloaded(), "should not call follow on unloaded nmethod");
2211
2212 // If the method is not entrant or zombie then a JMP is plastered over the
2213 // first few bytes. If an oop in the old code was there, that oop
2214 // should not get GC'd. Skip the first few bytes of oops on
2215 // not-entrant methods.
2216 address low_boundary = verified_entry_point();
2217 if (is_not_entrant()) {
2218 low_boundary += NativeJump::instruction_size;
2219 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
2220 // (See comment above.)
2221 }
2222
2223 RelocIterator iter(this, low_boundary);
2224
2225 while (iter.next()) {
2226 if (iter.type() == relocInfo::oop_type ) {
2227 oop_Relocation* r = iter.oop_reloc();
2228 // In this loop, we must only follow those oops directly embedded in
2229 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
2230 assert(1 == (r->oop_is_immediate()) +
2231 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
2232 "oop must be found in exactly one place");
2233 if (r->oop_is_immediate() && r->oop_value() != NULL) {
2234 f->do_oop(r->oop_addr());
2235 }
2236 }
2237 }
2238
2239 // Scopes
2240 // This includes oop constants not inlined in the code stream.
2241 for (oop* p = oops_begin(); p < oops_end(); p++) {
2242 if (*p == Universe::non_oop_word()) continue; // skip non-oops
2243 f->do_oop(p);
2244 }
2245 }
2246
2247 #define NMETHOD_SENTINEL ((nmethod*)badAddress)
2248
2249 nmethod* volatile nmethod::_oops_do_mark_nmethods;
2250
2251 // An nmethod is "marked" if its _mark_link is set non-null.
2252 // Even if it is the end of the linked list, it will have a non-null link value,
2253 // as long as it is on the list.
2254 // This code must be MP safe, because it is used from parallel GC passes.
2255 bool nmethod::test_set_oops_do_mark() {
2256 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");
2257 nmethod* observed_mark_link = _oops_do_mark_link;
2258 if (observed_mark_link == NULL) {
2259 // Claim this nmethod for this thread to mark.
2260 observed_mark_link = (nmethod*)
2261 Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_link, NULL);
2262 if (observed_mark_link == NULL) {
2263
2264 // Atomically append this nmethod (now claimed) to the head of the list:
2265 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods;
2266 for (;;) {
2267 nmethod* required_mark_nmethods = observed_mark_nmethods;
2268 _oops_do_mark_link = required_mark_nmethods;
2269 observed_mark_nmethods = (nmethod*)
2270 Atomic::cmpxchg_ptr(this, &_oops_do_mark_nmethods, required_mark_nmethods);
2271 if (observed_mark_nmethods == required_mark_nmethods)
2272 break;
2273 }
2274 // Mark was clear when we first saw this guy.
2275 NOT_PRODUCT(if (TraceScavenge) print_on(tty, "oops_do, mark"));
2276 return false;
2277 }
2278 }
2279 // On fall through, another racing thread marked this nmethod before we did.
2280 return true;
2281 }
2282
2283 void nmethod::oops_do_marking_prologue() {
2284 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("[oops_do_marking_prologue"));
2285 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row");
2286 // We use cmpxchg_ptr instead of regular assignment here because the user
2287 // may fork a bunch of threads, and we need them all to see the same state.
2288 void* observed = Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, NULL);
2289 guarantee(observed == NULL, "no races in this sequential code");
2290 }
2291
2292 void nmethod::oops_do_marking_epilogue() {
2293 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row");
2294 nmethod* cur = _oops_do_mark_nmethods;
2295 while (cur != NMETHOD_SENTINEL) {
2296 assert(cur != NULL, "not NULL-terminated");
2297 nmethod* next = cur->_oops_do_mark_link;
2298 cur->_oops_do_mark_link = NULL;
2299 cur->verify_oop_relocations();
2300 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark"));
2301 cur = next;
2302 }
2303 void* required = _oops_do_mark_nmethods;
2304 void* observed = Atomic::cmpxchg_ptr(NULL, &_oops_do_mark_nmethods, required);
2305 guarantee(observed == required, "no races in this sequential code");
2306 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("oops_do_marking_epilogue]"));
2307 }
2308
2309 class DetectScavengeRoot: public OopClosure {
2310 bool _detected_scavenge_root;
2311 public:
2312 DetectScavengeRoot() : _detected_scavenge_root(false)
2313 { NOT_PRODUCT(_print_nm = NULL); }
2314 bool detected_scavenge_root() { return _detected_scavenge_root; }
2315 virtual void do_oop(oop* p) {
2316 if ((*p) != NULL && (*p)->is_scavengable()) {
2317 NOT_PRODUCT(maybe_print(p));
2318 _detected_scavenge_root = true;
2319 }
2320 }
2321 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2322
2323 #ifndef PRODUCT
2324 nmethod* _print_nm;
2325 void maybe_print(oop* p) {
2326 if (_print_nm == NULL) return;
2327 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root");
2328 tty->print_cr(""PTR_FORMAT"[offset=%d] detected scavengable oop "PTR_FORMAT" (found at "PTR_FORMAT")",
2329 _print_nm, (int)((intptr_t)p - (intptr_t)_print_nm),
2330 (void *)(*p), (intptr_t)p);
2331 (*p)->print();
2332 }
2333 #endif //PRODUCT
2334 };
2335
2336 bool nmethod::detect_scavenge_root_oops() {
2337 DetectScavengeRoot detect_scavenge_root;
2338 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this);
2339 oops_do(&detect_scavenge_root);
2340 return detect_scavenge_root.detected_scavenge_root();
2341 }
2342
2343 // Method that knows how to preserve outgoing arguments at call. This method must be
2344 // called with a frame corresponding to a Java invoke
2345 void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) {
2346 #ifndef SHARK
2347 if (!method()->is_native()) {
2348 SimpleScopeDesc ssd(this, fr.pc());
2349 Bytecode_invoke call(ssd.method(), ssd.bci());
2350 bool has_receiver = call.has_receiver();
2351 bool has_appendix = call.has_appendix();
2352 Symbol* signature = call.signature();
2353 fr.oops_compiled_arguments_do(signature, has_receiver, has_appendix, reg_map, f);
2354 }
2355 #endif // !SHARK
2356 }
2357
2358
2359 oop nmethod::embeddedOop_at(u_char* p) {
2360 RelocIterator iter(this, p, p + 1);
2361 while (iter.next())
2362 if (iter.type() == relocInfo::oop_type) {
2363 return iter.oop_reloc()->oop_value();
2364 }
2365 return NULL;
2366 }
2367
2368
2369 inline bool includes(void* p, void* from, void* to) {
2370 return from <= p && p < to;
2371 }
2372
2373
2374 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
2375 assert(count >= 2, "must be sentinel values, at least");
2376
2377 #ifdef ASSERT
2378 // must be sorted and unique; we do a binary search in find_pc_desc()
2379 int prev_offset = pcs[0].pc_offset();
2380 assert(prev_offset == PcDesc::lower_offset_limit,
2381 "must start with a sentinel");
2382 for (int i = 1; i < count; i++) {
2383 int this_offset = pcs[i].pc_offset();
2384 assert(this_offset > prev_offset, "offsets must be sorted");
2385 prev_offset = this_offset;
2386 }
2387 assert(prev_offset == PcDesc::upper_offset_limit,
2388 "must end with a sentinel");
2389 #endif //ASSERT
2390
2391 // Search for MethodHandle invokes and tag the nmethod.
2392 for (int i = 0; i < count; i++) {
2393 if (pcs[i].is_method_handle_invoke()) {
2394 set_has_method_handle_invokes(true);
2395 break;
2396 }
2397 }
2398 assert(has_method_handle_invokes() == (_deoptimize_mh_offset != -1), "must have deopt mh handler");
2399
2400 int size = count * sizeof(PcDesc);
2401 assert(scopes_pcs_size() >= size, "oob");
2402 memcpy(scopes_pcs_begin(), pcs, size);
2403
2404 // Adjust the final sentinel downward.
2405 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
2406 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
2407 last_pc->set_pc_offset(content_size() + 1);
2408 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
2409 // Fill any rounding gaps with copies of the last record.
2410 last_pc[1] = last_pc[0];
2411 }
2412 // The following assert could fail if sizeof(PcDesc) is not
2413 // an integral multiple of oopSize (the rounding term).
2414 // If it fails, change the logic to always allocate a multiple
2415 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
2416 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
2417 }
2418
2419 void nmethod::copy_scopes_data(u_char* buffer, int size) {
2420 assert(scopes_data_size() >= size, "oob");
2421 memcpy(scopes_data_begin(), buffer, size);
2422 }
2423
2424
2425 #ifdef ASSERT
2426 static PcDesc* linear_search(nmethod* nm, int pc_offset, bool approximate) {
2427 PcDesc* lower = nm->scopes_pcs_begin();
2428 PcDesc* upper = nm->scopes_pcs_end();
2429 lower += 1; // exclude initial sentinel
2430 PcDesc* res = NULL;
2431 for (PcDesc* p = lower; p < upper; p++) {
2432 NOT_PRODUCT(--nmethod_stats.pc_desc_tests); // don't count this call to match_desc
2433 if (match_desc(p, pc_offset, approximate)) {
2434 if (res == NULL)
2435 res = p;
2436 else
2437 res = (PcDesc*) badAddress;
2438 }
2439 }
2440 return res;
2441 }
2442 #endif
2443
2444
2445 // Finds a PcDesc with real-pc equal to "pc"
2446 PcDesc* nmethod::find_pc_desc_internal(address pc, bool approximate) {
2447 address base_address = code_begin();
2448 if ((pc < base_address) ||
2449 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
2450 return NULL; // PC is wildly out of range
2451 }
2452 int pc_offset = (int) (pc - base_address);
2453
2454 // Check the PcDesc cache if it contains the desired PcDesc
2455 // (This as an almost 100% hit rate.)
2456 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
2457 if (res != NULL) {
2458 assert(res == linear_search(this, pc_offset, approximate), "cache ok");
2459 return res;
2460 }
2461
2462 // Fallback algorithm: quasi-linear search for the PcDesc
2463 // Find the last pc_offset less than the given offset.
2464 // The successor must be the required match, if there is a match at all.
2465 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
2466 PcDesc* lower = scopes_pcs_begin();
2467 PcDesc* upper = scopes_pcs_end();
2468 upper -= 1; // exclude final sentinel
2469 if (lower >= upper) return NULL; // native method; no PcDescs at all
2470
2471 #define assert_LU_OK \
2472 /* invariant on lower..upper during the following search: */ \
2473 assert(lower->pc_offset() < pc_offset, "sanity"); \
2474 assert(upper->pc_offset() >= pc_offset, "sanity")
2475 assert_LU_OK;
2476
2477 // Use the last successful return as a split point.
2478 PcDesc* mid = _pc_desc_cache.last_pc_desc();
2479 NOT_PRODUCT(++nmethod_stats.pc_desc_searches);
2480 if (mid->pc_offset() < pc_offset) {
2481 lower = mid;
2482 } else {
2483 upper = mid;
2484 }
2485
2486 // Take giant steps at first (4096, then 256, then 16, then 1)
2487 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
2488 const int RADIX = (1 << LOG2_RADIX);
2489 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
2490 while ((mid = lower + step) < upper) {
2491 assert_LU_OK;
2492 NOT_PRODUCT(++nmethod_stats.pc_desc_searches);
2493 if (mid->pc_offset() < pc_offset) {
2494 lower = mid;
2495 } else {
2496 upper = mid;
2497 break;
2498 }
2499 }
2500 assert_LU_OK;
2501 }
2502
2503 // Sneak up on the value with a linear search of length ~16.
2504 while (true) {
2505 assert_LU_OK;
2506 mid = lower + 1;
2507 NOT_PRODUCT(++nmethod_stats.pc_desc_searches);
2508 if (mid->pc_offset() < pc_offset) {
2509 lower = mid;
2510 } else {
2511 upper = mid;
2512 break;
2513 }
2514 }
2515 #undef assert_LU_OK
2516
2517 if (match_desc(upper, pc_offset, approximate)) {
2518 assert(upper == linear_search(this, pc_offset, approximate), "search ok");
2519 _pc_desc_cache.add_pc_desc(upper);
2520 return upper;
2521 } else {
2522 assert(NULL == linear_search(this, pc_offset, approximate), "search ok");
2523 return NULL;
2524 }
2525 }
2526
2527
2528 bool nmethod::check_all_dependencies() {
2529 bool found_check = false;
2530 // wholesale check of all dependencies
2531 for (Dependencies::DepStream deps(this); deps.next(); ) {
2532 if (deps.check_dependency() != NULL) {
2533 found_check = true;
2534 NOT_DEBUG(break);
2535 }
2536 }
2537 return found_check; // tell caller if we found anything
2538 }
2539
2540 bool nmethod::check_dependency_on(DepChange& changes) {
2541 // What has happened:
2542 // 1) a new class dependee has been added
2543 // 2) dependee and all its super classes have been marked
2544 bool found_check = false; // set true if we are upset
2545 for (Dependencies::DepStream deps(this); deps.next(); ) {
2546 // Evaluate only relevant dependencies.
2547 if (deps.spot_check_dependency_at(changes) != NULL) {
2548 found_check = true;
2549 NOT_DEBUG(break);
2550 }
2551 }
2552 return found_check;
2553 }
2554
2555 bool nmethod::is_evol_dependent_on(Klass* dependee) {
2556 InstanceKlass *dependee_ik = InstanceKlass::cast(dependee);
2557 Array<Method*>* dependee_methods = dependee_ik->methods();
2558 for (Dependencies::DepStream deps(this); deps.next(); ) {
2559 if (deps.type() == Dependencies::evol_method) {
2560 Method* method = deps.method_argument(0);
2561 for (int j = 0; j < dependee_methods->length(); j++) {
2562 if (dependee_methods->at(j) == method) {
2563 // RC_TRACE macro has an embedded ResourceMark
2564 RC_TRACE(0x01000000,
2565 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)",
2566 _method->method_holder()->external_name(),
2567 _method->name()->as_C_string(),
2568 _method->signature()->as_C_string(), compile_id(),
2569 method->method_holder()->external_name(),
2570 method->name()->as_C_string(),
2571 method->signature()->as_C_string()));
2572 if (TraceDependencies || LogCompilation)
2573 deps.log_dependency(dependee);
2574 return true;
2575 }
2576 }
2577 }
2578 }
2579 return false;
2580 }
2581
2582 // Called from mark_for_deoptimization, when dependee is invalidated.
2583 bool nmethod::is_dependent_on_method(Method* dependee) {
2584 for (Dependencies::DepStream deps(this); deps.next(); ) {
2585 if (deps.type() != Dependencies::evol_method)
2586 continue;
2587 Method* method = deps.method_argument(0);
2588 if (method == dependee) return true;
2589 }
2590 return false;
2591 }
2592
2593
2594 bool nmethod::is_patchable_at(address instr_addr) {
2595 assert(insts_contains(instr_addr), "wrong nmethod used");
2596 if (is_zombie()) {
2597 // a zombie may never be patched
2598 return false;
2599 }
2600 return true;
2601 }
2602
2603
2604 address nmethod::continuation_for_implicit_exception(address pc) {
2605 // Exception happened outside inline-cache check code => we are inside
2606 // an active nmethod => use cpc to determine a return address
2607 int exception_offset = pc - code_begin();
2608 int cont_offset = ImplicitExceptionTable(this).at( exception_offset );
2609 #ifdef ASSERT
2610 if (cont_offset == 0) {
2611 Thread* thread = ThreadLocalStorage::get_thread_slow();
2612 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
2613 HandleMark hm(thread);
2614 ResourceMark rm(thread);
2615 CodeBlob* cb = CodeCache::find_blob(pc);
2616 assert(cb != NULL && cb == this, "");
2617 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, pc);
2618 print();
2619 method()->print_codes();
2620 print_code();
2621 print_pcs();
2622 }
2623 #endif
2624 if (cont_offset == 0) {
2625 // Let the normal error handling report the exception
2626 return NULL;
2627 }
2628 return code_begin() + cont_offset;
2629 }
2630
2631
2632
2633 void nmethod_init() {
2634 // make sure you didn't forget to adjust the filler fields
2635 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
2636 }
2637
2638
2639 //-------------------------------------------------------------------------------------------
2640
2641
2642 // QQQ might we make this work from a frame??
2643 nmethodLocker::nmethodLocker(address pc) {
2644 CodeBlob* cb = CodeCache::find_blob(pc);
2645 guarantee(cb != NULL && cb->is_nmethod(), "bad pc for a nmethod found");
2646 _nm = (nmethod*)cb;
2647 lock_nmethod(_nm);
2648 }
2649
2650 // Only JvmtiDeferredEvent::compiled_method_unload_event()
2651 // should pass zombie_ok == true.
2652 void nmethodLocker::lock_nmethod(nmethod* nm, bool zombie_ok) {
2653 if (nm == NULL) return;
2654 Atomic::inc(&nm->_lock_count);
2655 guarantee(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method");
2656 }
2657
2658 void nmethodLocker::unlock_nmethod(nmethod* nm) {
2659 if (nm == NULL) return;
2660 Atomic::dec(&nm->_lock_count);
2661 guarantee(nm->_lock_count >= 0, "unmatched nmethod lock/unlock");
2662 }
2663
2664
2665 // -----------------------------------------------------------------------------
2666 // nmethod::get_deopt_original_pc
2667 //
2668 // Return the original PC for the given PC if:
2669 // (a) the given PC belongs to a nmethod and
2670 // (b) it is a deopt PC
2671 address nmethod::get_deopt_original_pc(const frame* fr) {
2672 if (fr->cb() == NULL) return NULL;
2673
2674 nmethod* nm = fr->cb()->as_nmethod_or_null();
2675 if (nm != NULL && nm->is_deopt_pc(fr->pc()))
2676 return nm->get_original_pc(fr);
2677
2678 return NULL;
2679 }
2680
2681
2682 // -----------------------------------------------------------------------------
2683 // MethodHandle
2684
2685 bool nmethod::is_method_handle_return(address return_pc) {
2686 if (!has_method_handle_invokes()) return false;
2687 PcDesc* pd = pc_desc_at(return_pc);
2688 if (pd == NULL)
2689 return false;
2690 return pd->is_method_handle_invoke();
2691 }
2692
2693
2694 // -----------------------------------------------------------------------------
2695 // Verification
2696
2697 class VerifyOopsClosure: public OopClosure {
2698 nmethod* _nm;
2699 bool _ok;
2700 public:
2701 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
2702 bool ok() { return _ok; }
2703 virtual void do_oop(oop* p) {
2704 if ((*p) == NULL || (*p)->is_oop()) return;
2705 if (_ok) {
2706 _nm->print_nmethod(true);
2707 _ok = false;
2708 }
2709 tty->print_cr("*** non-oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)",
2710 (void *)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm));
2711 }
2712 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2713 };
2714
2715 void nmethod::verify() {
2716
2717 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant
2718 // seems odd.
2719
2720 if (is_zombie() || is_not_entrant() || is_unloaded())
2721 return;
2722
2723 // Make sure all the entry points are correctly aligned for patching.
2724 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
2725
2726 // assert(method()->is_oop(), "must be valid");
2727
2728 ResourceMark rm;
2729
2730 if (!CodeCache::contains(this)) {
2731 fatal(err_msg("nmethod at " INTPTR_FORMAT " not in zone", this));
2732 }
2733
2734 if(is_native_method() )
2735 return;
2736
2737 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
2738 if (nm != this) {
2739 fatal(err_msg("findNMethod did not find this nmethod (" INTPTR_FORMAT ")",
2740 this));
2741 }
2742
2743 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2744 if (! p->verify(this)) {
2745 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", this);
2746 }
2747 }
2748
2749 VerifyOopsClosure voc(this);
2750 oops_do(&voc);
2751 assert(voc.ok(), "embedded oops must be OK");
2752 verify_scavenge_root_oops();
2753
2754 verify_scopes();
2755 }
2756
2757
2758 void nmethod::verify_interrupt_point(address call_site) {
2759 // Verify IC only when nmethod installation is finished.
2760 bool is_installed = (method()->code() == this) // nmethod is in state 'in_use' and installed
2761 || !this->is_in_use(); // nmethod is installed, but not in 'in_use' state
2762 if (is_installed) {
2763 Thread *cur = Thread::current();
2764 if (CompiledIC_lock->owner() == cur ||
2765 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) &&
2766 SafepointSynchronize::is_at_safepoint())) {
2767 CompiledIC_at(this, call_site);
2768 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
2769 } else {
2770 MutexLocker ml_verify (CompiledIC_lock);
2771 CompiledIC_at(this, call_site);
2772 }
2773 }
2774
2775 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address());
2776 assert(pd != NULL, "PcDesc must exist");
2777 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(),
2778 pd->obj_decode_offset(), pd->should_reexecute(),
2779 pd->return_oop());
2780 !sd->is_top(); sd = sd->sender()) {
2781 sd->verify();
2782 }
2783 }
2784
2785 void nmethod::verify_scopes() {
2786 if( !method() ) return; // Runtime stubs have no scope
2787 if (method()->is_native()) return; // Ignore stub methods.
2788 // iterate through all interrupt point
2789 // and verify the debug information is valid.
2790 RelocIterator iter((nmethod*)this);
2791 while (iter.next()) {
2792 address stub = NULL;
2793 switch (iter.type()) {
2794 case relocInfo::virtual_call_type:
2795 verify_interrupt_point(iter.addr());
2796 break;
2797 case relocInfo::opt_virtual_call_type:
2798 stub = iter.opt_virtual_call_reloc()->static_stub();
2799 verify_interrupt_point(iter.addr());
2800 break;
2801 case relocInfo::static_call_type:
2802 stub = iter.static_call_reloc()->static_stub();
2803 //verify_interrupt_point(iter.addr());
2804 break;
2805 case relocInfo::runtime_call_type:
2806 address destination = iter.reloc()->value();
2807 // Right now there is no way to find out which entries support
2808 // an interrupt point. It would be nice if we had this
2809 // information in a table.
2810 break;
2811 }
2812 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section");
2813 }
2814 }
2815
2816
2817 // -----------------------------------------------------------------------------
2818 // Non-product code
2819 #ifndef PRODUCT
2820
2821 class DebugScavengeRoot: public OopClosure {
2822 nmethod* _nm;
2823 bool _ok;
2824 public:
2825 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { }
2826 bool ok() { return _ok; }
2827 virtual void do_oop(oop* p) {
2828 if ((*p) == NULL || !(*p)->is_scavengable()) return;
2829 if (_ok) {
2830 _nm->print_nmethod(true);
2831 _ok = false;
2832 }
2833 tty->print_cr("*** scavengable oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)",
2834 (void *)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm));
2835 (*p)->print();
2836 }
2837 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2838 };
2839
2840 void nmethod::verify_scavenge_root_oops() {
2841 if (UseG1GC) {
2842 return;
2843 }
2844
2845 if (!on_scavenge_root_list()) {
2846 // Actually look inside, to verify the claim that it's clean.
2847 DebugScavengeRoot debug_scavenge_root(this);
2848 oops_do(&debug_scavenge_root);
2849 if (!debug_scavenge_root.ok())
2850 fatal("found an unadvertised bad scavengable oop in the code cache");
2851 }
2852 assert(scavenge_root_not_marked(), "");
2853 }
2854
2855 #endif // PRODUCT
2856
2857 // Printing operations
2858
2859 void nmethod::print() const {
2860 ResourceMark rm;
2861 ttyLocker ttyl; // keep the following output all in one block
2862
2863 tty->print("Compiled method ");
2864
2865 if (is_compiled_by_c1()) {
2866 tty->print("(c1) ");
2867 } else if (is_compiled_by_c2()) {
2868 tty->print("(c2) ");
2869 } else if (is_compiled_by_shark()) {
2870 tty->print("(shark) ");
2871 } else {
2872 tty->print("(nm) ");
2873 }
2874
2875 print_on(tty, NULL);
2876
2877 if (WizardMode) {
2878 tty->print("((nmethod*) "INTPTR_FORMAT ") ", this);
2879 tty->print(" for method " INTPTR_FORMAT , (address)method());
2880 tty->print(" { ");
2881 if (is_in_use()) tty->print("in_use ");
2882 if (is_not_entrant()) tty->print("not_entrant ");
2883 if (is_zombie()) tty->print("zombie ");
2884 if (is_unloaded()) tty->print("unloaded ");
2885 if (on_scavenge_root_list()) tty->print("scavenge_root ");
2886 tty->print_cr("}:");
2887 }
2888 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2889 (address)this,
2890 (address)this + size(),
2891 size());
2892 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2893 relocation_begin(),
2894 relocation_end(),
2895 relocation_size());
2896 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2897 consts_begin(),
2898 consts_end(),
2899 consts_size());
2900 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2901 insts_begin(),
2902 insts_end(),
2903 insts_size());
2904 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2905 stub_begin(),
2906 stub_end(),
2907 stub_size());
2908 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2909 oops_begin(),
2910 oops_end(),
2911 oops_size());
2912 if (metadata_size () > 0) tty->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2913 metadata_begin(),
2914 metadata_end(),
2915 metadata_size());
2916 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2917 scopes_data_begin(),
2918 scopes_data_end(),
2919 scopes_data_size());
2920 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2921 scopes_pcs_begin(),
2922 scopes_pcs_end(),
2923 scopes_pcs_size());
2924 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2925 dependencies_begin(),
2926 dependencies_end(),
2927 dependencies_size());
2928 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2929 handler_table_begin(),
2930 handler_table_end(),
2931 handler_table_size());
2932 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2933 nul_chk_table_begin(),
2934 nul_chk_table_end(),
2935 nul_chk_table_size());
2936 }
2937
2938 void nmethod::print_code() {
2939 HandleMark hm;
2940 ResourceMark m;
2941 Disassembler::decode(this);
2942 }
2943
2944
2945 #ifndef PRODUCT
2946
2947 void nmethod::print_scopes() {
2948 // Find the first pc desc for all scopes in the code and print it.
2949 ResourceMark rm;
2950 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2951 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
2952 continue;
2953
2954 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
2955 sd->print_on(tty, p);
2956 }
2957 }
2958
2959 void nmethod::print_dependencies() {
2960 ResourceMark rm;
2961 ttyLocker ttyl; // keep the following output all in one block
2962 tty->print_cr("Dependencies:");
2963 for (Dependencies::DepStream deps(this); deps.next(); ) {
2964 deps.print_dependency();
2965 Klass* ctxk = deps.context_type();
2966 if (ctxk != NULL) {
2967 if (ctxk->oop_is_instance() && ((InstanceKlass*)ctxk)->is_dependent_nmethod(this)) {
2968 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name());
2969 }
2970 }
2971 deps.log_dependency(); // put it into the xml log also
2972 }
2973 }
2974
2975
2976 void nmethod::print_relocations() {
2977 ResourceMark m; // in case methods get printed via the debugger
2978 tty->print_cr("relocations:");
2979 RelocIterator iter(this);
2980 iter.print();
2981 if (UseRelocIndex) {
2982 jint* index_end = (jint*)relocation_end() - 1;
2983 jint index_size = *index_end;
2984 jint* index_start = (jint*)( (address)index_end - index_size );
2985 tty->print_cr(" index @" INTPTR_FORMAT ": index_size=%d", index_start, index_size);
2986 if (index_size > 0) {
2987 jint* ip;
2988 for (ip = index_start; ip+2 <= index_end; ip += 2)
2989 tty->print_cr(" (%d %d) addr=" INTPTR_FORMAT " @" INTPTR_FORMAT,
2990 ip[0],
2991 ip[1],
2992 header_end()+ip[0],
2993 relocation_begin()-1+ip[1]);
2994 for (; ip < index_end; ip++)
2995 tty->print_cr(" (%d ?)", ip[0]);
2996 tty->print_cr(" @" INTPTR_FORMAT ": index_size=%d", ip, *ip);
2997 ip++;
2998 tty->print_cr("reloc_end @" INTPTR_FORMAT ":", ip);
2999 }
3000 }
3001 }
3002
3003
3004 void nmethod::print_pcs() {
3005 ResourceMark m; // in case methods get printed via debugger
3006 tty->print_cr("pc-bytecode offsets:");
3007 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
3008 p->print(this);
3009 }
3010 }
3011
3012 #endif // PRODUCT
3013
3014 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
3015 RelocIterator iter(this, begin, end);
3016 bool have_one = false;
3017 while (iter.next()) {
3018 have_one = true;
3019 switch (iter.type()) {
3020 case relocInfo::none: return "no_reloc";
3021 case relocInfo::oop_type: {
3022 stringStream st;
3023 oop_Relocation* r = iter.oop_reloc();
3024 oop obj = r->oop_value();
3025 st.print("oop(");
3026 if (obj == NULL) st.print("NULL");
3027 else obj->print_value_on(&st);
3028 st.print(")");
3029 return st.as_string();
3030 }
3031 case relocInfo::metadata_type: {
3032 stringStream st;
3033 metadata_Relocation* r = iter.metadata_reloc();
3034 Metadata* obj = r->metadata_value();
3035 st.print("metadata(");
3036 if (obj == NULL) st.print("NULL");
3037 else obj->print_value_on(&st);
3038 st.print(")");
3039 return st.as_string();
3040 }
3041 case relocInfo::virtual_call_type: return "virtual_call";
3042 case relocInfo::opt_virtual_call_type: return "optimized virtual_call";
3043 case relocInfo::static_call_type: return "static_call";
3044 case relocInfo::static_stub_type: return "static_stub";
3045 case relocInfo::runtime_call_type: return "runtime_call";
3046 case relocInfo::external_word_type: return "external_word";
3047 case relocInfo::internal_word_type: return "internal_word";
3048 case relocInfo::section_word_type: return "section_word";
3049 case relocInfo::poll_type: return "poll";
3050 case relocInfo::poll_return_type: return "poll_return";
3051 case relocInfo::type_mask: return "type_bit_mask";
3052 }
3053 }
3054 return have_one ? "other" : NULL;
3055 }
3056
3057 // Return a the last scope in (begin..end]
3058 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
3059 PcDesc* p = pc_desc_near(begin+1);
3060 if (p != NULL && p->real_pc(this) <= end) {
3061 return new ScopeDesc(this, p->scope_decode_offset(),
3062 p->obj_decode_offset(), p->should_reexecute(),
3063 p->return_oop());
3064 }
3065 return NULL;
3066 }
3067
3068 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const {
3069 if (block_begin == entry_point()) stream->print_cr("[Entry Point]");
3070 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]");
3071 if (block_begin == exception_begin()) stream->print_cr("[Exception Handler]");
3072 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]");
3073 if (block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]");
3074
3075 if (has_method_handle_invokes())
3076 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]");
3077
3078 if (block_begin == consts_begin()) stream->print_cr("[Constants]");
3079
3080 if (block_begin == entry_point()) {
3081 methodHandle m = method();
3082 if (m.not_null()) {
3083 stream->print(" # ");
3084 m->print_value_on(stream);
3085 stream->cr();
3086 }
3087 if (m.not_null() && !is_osr_method()) {
3088 ResourceMark rm;
3089 int sizeargs = m->size_of_parameters();
3090 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
3091 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
3092 {
3093 int sig_index = 0;
3094 if (!m->is_static())
3095 sig_bt[sig_index++] = T_OBJECT; // 'this'
3096 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) {
3097 BasicType t = ss.type();
3098 sig_bt[sig_index++] = t;
3099 if (type2size[t] == 2) {
3100 sig_bt[sig_index++] = T_VOID;
3101 } else {
3102 assert(type2size[t] == 1, "size is 1 or 2");
3103 }
3104 }
3105 assert(sig_index == sizeargs, "");
3106 }
3107 const char* spname = "sp"; // make arch-specific?
3108 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false);
3109 int stack_slot_offset = this->frame_size() * wordSize;
3110 int tab1 = 14, tab2 = 24;
3111 int sig_index = 0;
3112 int arg_index = (m->is_static() ? 0 : -1);
3113 bool did_old_sp = false;
3114 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) {
3115 bool at_this = (arg_index == -1);
3116 bool at_old_sp = false;
3117 BasicType t = (at_this ? T_OBJECT : ss.type());
3118 assert(t == sig_bt[sig_index], "sigs in sync");
3119 if (at_this)
3120 stream->print(" # this: ");
3121 else
3122 stream->print(" # parm%d: ", arg_index);
3123 stream->move_to(tab1);
3124 VMReg fst = regs[sig_index].first();
3125 VMReg snd = regs[sig_index].second();
3126 if (fst->is_reg()) {
3127 stream->print("%s", fst->name());
3128 if (snd->is_valid()) {
3129 stream->print(":%s", snd->name());
3130 }
3131 } else if (fst->is_stack()) {
3132 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
3133 if (offset == stack_slot_offset) at_old_sp = true;
3134 stream->print("[%s+0x%x]", spname, offset);
3135 } else {
3136 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
3137 }
3138 stream->print(" ");
3139 stream->move_to(tab2);
3140 stream->print("= ");
3141 if (at_this) {
3142 m->method_holder()->print_value_on(stream);
3143 } else {
3144 bool did_name = false;
3145 if (!at_this && ss.is_object()) {
3146 Symbol* name = ss.as_symbol_or_null();
3147 if (name != NULL) {
3148 name->print_value_on(stream);
3149 did_name = true;
3150 }
3151 }
3152 if (!did_name)
3153 stream->print("%s", type2name(t));
3154 }
3155 if (at_old_sp) {
3156 stream->print(" (%s of caller)", spname);
3157 did_old_sp = true;
3158 }
3159 stream->cr();
3160 sig_index += type2size[t];
3161 arg_index += 1;
3162 if (!at_this) ss.next();
3163 }
3164 if (!did_old_sp) {
3165 stream->print(" # ");
3166 stream->move_to(tab1);
3167 stream->print("[%s+0x%x]", spname, stack_slot_offset);
3168 stream->print(" (%s of caller)", spname);
3169 stream->cr();
3170 }
3171 }
3172 }
3173 }
3174
3175 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) {
3176 // First, find an oopmap in (begin, end].
3177 // We use the odd half-closed interval so that oop maps and scope descs
3178 // which are tied to the byte after a call are printed with the call itself.
3179 address base = code_begin();
3180 OopMapSet* oms = oop_maps();
3181 if (oms != NULL) {
3182 for (int i = 0, imax = oms->size(); i < imax; i++) {
3183 OopMap* om = oms->at(i);
3184 address pc = base + om->offset();
3185 if (pc > begin) {
3186 if (pc <= end) {
3187 st->move_to(column);
3188 st->print("; ");
3189 om->print_on(st);
3190 }
3191 break;
3192 }
3193 }
3194 }
3195
3196 // Print any debug info present at this pc.
3197 ScopeDesc* sd = scope_desc_in(begin, end);
3198 if (sd != NULL) {
3199 st->move_to(column);
3200 if (sd->bci() == SynchronizationEntryBCI) {
3201 st->print(";*synchronization entry");
3202 } else {
3203 if (sd->method() == NULL) {
3204 st->print("method is NULL");
3205 } else if (sd->method()->is_native()) {
3206 st->print("method is native");
3207 } else {
3208 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci());
3209 st->print(";*%s", Bytecodes::name(bc));
3210 switch (bc) {
3211 case Bytecodes::_invokevirtual:
3212 case Bytecodes::_invokespecial:
3213 case Bytecodes::_invokestatic:
3214 case Bytecodes::_invokeinterface:
3215 {
3216 Bytecode_invoke invoke(sd->method(), sd->bci());
3217 st->print(" ");
3218 if (invoke.name() != NULL)
3219 invoke.name()->print_symbol_on(st);
3220 else
3221 st->print("<UNKNOWN>");
3222 break;
3223 }
3224 case Bytecodes::_getfield:
3225 case Bytecodes::_putfield:
3226 case Bytecodes::_getstatic:
3227 case Bytecodes::_putstatic:
3228 {
3229 Bytecode_field field(sd->method(), sd->bci());
3230 st->print(" ");
3231 if (field.name() != NULL)
3232 field.name()->print_symbol_on(st);
3233 else
3234 st->print("<UNKNOWN>");
3235 }
3236 }
3237 }
3238 }
3239
3240 // Print all scopes
3241 for (;sd != NULL; sd = sd->sender()) {
3242 st->move_to(column);
3243 st->print("; -");
3244 if (sd->method() == NULL) {
3245 st->print("method is NULL");
3246 } else {
3247 sd->method()->print_short_name(st);
3248 }
3249 int lineno = sd->method()->line_number_from_bci(sd->bci());
3250 if (lineno != -1) {
3251 st->print("@%d (line %d)", sd->bci(), lineno);
3252 } else {
3253 st->print("@%d", sd->bci());
3254 }
3255 st->cr();
3256 }
3257 }
3258
3259 // Print relocation information
3260 const char* str = reloc_string_for(begin, end);
3261 if (str != NULL) {
3262 if (sd != NULL) st->cr();
3263 st->move_to(column);
3264 st->print("; {%s}", str);
3265 }
3266 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin());
3267 if (cont_offset != 0) {
3268 st->move_to(column);
3269 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, code_begin() + cont_offset);
3270 }
3271
3272 }
3273
3274 #ifndef PRODUCT
3275
3276 void nmethod::print_value_on(outputStream* st) const {
3277 st->print("nmethod");
3278 print_on(st, NULL);
3279 }
3280
3281 void nmethod::print_calls(outputStream* st) {
3282 RelocIterator iter(this);
3283 while (iter.next()) {
3284 switch (iter.type()) {
3285 case relocInfo::virtual_call_type:
3286 case relocInfo::opt_virtual_call_type: {
3287 VerifyMutexLocker mc(CompiledIC_lock);
3288 CompiledIC_at(&iter)->print();
3289 break;
3290 }
3291 case relocInfo::static_call_type:
3292 st->print_cr("Static call at " INTPTR_FORMAT, iter.reloc()->addr());
3293 compiledStaticCall_at(iter.reloc())->print();
3294 break;
3295 }
3296 }
3297 }
3298
3299 void nmethod::print_handler_table() {
3300 ExceptionHandlerTable(this).print();
3301 }
3302
3303 void nmethod::print_nul_chk_table() {
3304 ImplicitExceptionTable(this).print(code_begin());
3305 }
3306
3307 void nmethod::print_statistics() {
3308 ttyLocker ttyl;
3309 if (xtty != NULL) xtty->head("statistics type='nmethod'");
3310 nmethod_stats.print_native_nmethod_stats();
3311 nmethod_stats.print_nmethod_stats();
3312 DebugInformationRecorder::print_statistics();
3313 nmethod_stats.print_pc_stats();
3314 Dependencies::print_statistics();
3315 if (xtty != NULL) xtty->tail("statistics");
3316 }
3317
3318 #endif // PRODUCT