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 #ifdef SHARK
47 #include "shark/sharkCompiler.hpp"
48 #endif
49
50 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
51
52 unsigned char nmethod::_global_unloading_clock = 0;
53
54 #ifdef DTRACE_ENABLED
55
56 // Only bother with this argument setup if dtrace is available
57
58 #ifndef USDT2
59 HS_DTRACE_PROBE_DECL8(hotspot, compiled__method__load,
60 const char*, int, const char*, int, const char*, int, void*, size_t);
61
62 HS_DTRACE_PROBE_DECL6(hotspot, compiled__method__unload,
63 char*, int, char*, int, char*, int);
64
65 #define DTRACE_METHOD_UNLOAD_PROBE(method) \
66 { \
67 Method* m = (method); \
68 if (m != NULL) { \
69 Symbol* klass_name = m->klass_name(); \
70 Symbol* name = m->name(); \
71 Symbol* signature = m->signature(); \
72 HS_DTRACE_PROBE6(hotspot, compiled__method__unload, \
73 klass_name->bytes(), klass_name->utf8_length(), \
74 name->bytes(), name->utf8_length(), \
75 signature->bytes(), signature->utf8_length()); \
76 } \
77 }
78 #else /* USDT2 */
79 #define DTRACE_METHOD_UNLOAD_PROBE(method) \
80 { \
81 Method* m = (method); \
82 if (m != NULL) { \
83 Symbol* klass_name = m->klass_name(); \
84 Symbol* name = m->name(); \
85 Symbol* signature = m->signature(); \
86 HOTSPOT_COMPILED_METHOD_UNLOAD( \
87 (char *) klass_name->bytes(), klass_name->utf8_length(), \
88 (char *) name->bytes(), name->utf8_length(), \
89 (char *) signature->bytes(), signature->utf8_length()); \
90 } \
91 }
92 #endif /* USDT2 */
93
94 #else // ndef DTRACE_ENABLED
95
96 #define DTRACE_METHOD_UNLOAD_PROBE(method)
97
98 #endif
99
100 bool nmethod::is_compiled_by_c1() const {
101 if (compiler() == NULL) {
102 return false;
103 }
104 return compiler()->is_c1();
105 }
106 bool nmethod::is_compiled_by_c2() const {
107 if (compiler() == NULL) {
108 return false;
109 }
110 return compiler()->is_c2();
111 }
112 bool nmethod::is_compiled_by_shark() const {
113 if (compiler() == NULL) {
114 return false;
115 }
116 return compiler()->is_shark();
117 }
118
119
120
121 //---------------------------------------------------------------------------------
122 // NMethod statistics
123 // They are printed under various flags, including:
124 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation.
125 // (In the latter two cases, they like other stats are printed to the log only.)
126
127 #ifndef PRODUCT
128 // These variables are put into one block to reduce relocations
129 // and make it simpler to print from the debugger.
130 static
131 struct nmethod_stats_struct {
132 int nmethod_count;
133 int total_size;
134 int relocation_size;
135 int consts_size;
136 int insts_size;
137 int stub_size;
138 int scopes_data_size;
139 int scopes_pcs_size;
140 int dependencies_size;
141 int handler_table_size;
142 int nul_chk_table_size;
143 int oops_size;
144
145 void note_nmethod(nmethod* nm) {
146 nmethod_count += 1;
147 total_size += nm->size();
148 relocation_size += nm->relocation_size();
149 consts_size += nm->consts_size();
150 insts_size += nm->insts_size();
151 stub_size += nm->stub_size();
152 oops_size += nm->oops_size();
153 scopes_data_size += nm->scopes_data_size();
154 scopes_pcs_size += nm->scopes_pcs_size();
155 dependencies_size += nm->dependencies_size();
156 handler_table_size += nm->handler_table_size();
157 nul_chk_table_size += nm->nul_chk_table_size();
158 }
159 void print_nmethod_stats() {
160 if (nmethod_count == 0) return;
161 tty->print_cr("Statistics for %d bytecoded nmethods:", nmethod_count);
162 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size);
163 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size);
164 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size);
165 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size);
166 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size);
167 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size);
168 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size);
169 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size);
170 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size);
171 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size);
172 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size);
173 }
174
175 int native_nmethod_count;
176 int native_total_size;
177 int native_relocation_size;
178 int native_insts_size;
179 int native_oops_size;
180 void note_native_nmethod(nmethod* nm) {
181 native_nmethod_count += 1;
182 native_total_size += nm->size();
183 native_relocation_size += nm->relocation_size();
184 native_insts_size += nm->insts_size();
185 native_oops_size += nm->oops_size();
186 }
187 void print_native_nmethod_stats() {
188 if (native_nmethod_count == 0) return;
189 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count);
190 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size);
191 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size);
192 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size);
193 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size);
194 }
195
196 int pc_desc_resets; // number of resets (= number of caches)
197 int pc_desc_queries; // queries to nmethod::find_pc_desc
198 int pc_desc_approx; // number of those which have approximate true
199 int pc_desc_repeats; // number of _pc_descs[0] hits
200 int pc_desc_hits; // number of LRU cache hits
201 int pc_desc_tests; // total number of PcDesc examinations
202 int pc_desc_searches; // total number of quasi-binary search steps
203 int pc_desc_adds; // number of LUR cache insertions
204
205 void print_pc_stats() {
206 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query",
207 pc_desc_queries,
208 (double)(pc_desc_tests + pc_desc_searches)
209 / pc_desc_queries);
210 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d",
211 pc_desc_resets,
212 pc_desc_queries, pc_desc_approx,
213 pc_desc_repeats, pc_desc_hits,
214 pc_desc_tests, pc_desc_searches, pc_desc_adds);
215 }
216 } nmethod_stats;
217 #endif //PRODUCT
218
219
220 //---------------------------------------------------------------------------------
221
222
223 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) {
224 assert(pc != NULL, "Must be non null");
225 assert(exception.not_null(), "Must be non null");
226 assert(handler != NULL, "Must be non null");
227
228 _count = 0;
229 _exception_type = exception->klass();
230 _next = NULL;
231
232 add_address_and_handler(pc,handler);
233 }
234
235
236 address ExceptionCache::match(Handle exception, address pc) {
237 assert(pc != NULL,"Must be non null");
238 assert(exception.not_null(),"Must be non null");
239 if (exception->klass() == exception_type()) {
240 return (test_address(pc));
241 }
242
243 return NULL;
244 }
245
246
247 bool ExceptionCache::match_exception_with_space(Handle exception) {
248 assert(exception.not_null(),"Must be non null");
249 if (exception->klass() == exception_type() && count() < cache_size) {
250 return true;
251 }
252 return false;
253 }
254
255
256 address ExceptionCache::test_address(address addr) {
257 for (int i=0; i<count(); i++) {
258 if (pc_at(i) == addr) {
259 return handler_at(i);
260 }
261 }
262 return NULL;
263 }
264
265
266 bool ExceptionCache::add_address_and_handler(address addr, address handler) {
267 if (test_address(addr) == handler) return true;
268 if (count() < cache_size) {
269 set_pc_at(count(),addr);
270 set_handler_at(count(), handler);
271 increment_count();
272 return true;
273 }
274 return false;
275 }
276
277
278 // private method for handling exception cache
279 // These methods are private, and used to manipulate the exception cache
280 // directly.
281 ExceptionCache* nmethod::exception_cache_entry_for_exception(Handle exception) {
282 ExceptionCache* ec = exception_cache();
283 while (ec != NULL) {
284 if (ec->match_exception_with_space(exception)) {
285 return ec;
286 }
287 ec = ec->next();
288 }
289 return NULL;
290 }
291
292
293 //-----------------------------------------------------------------------------
294
295
296 // Helper used by both find_pc_desc methods.
297 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) {
298 NOT_PRODUCT(++nmethod_stats.pc_desc_tests);
299 if (!approximate)
300 return pc->pc_offset() == pc_offset;
301 else
302 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset();
303 }
304
305 void PcDescCache::reset_to(PcDesc* initial_pc_desc) {
306 if (initial_pc_desc == NULL) {
307 _pc_descs[0] = NULL; // native method; no PcDescs at all
308 return;
309 }
310 NOT_PRODUCT(++nmethod_stats.pc_desc_resets);
311 // reset the cache by filling it with benign (non-null) values
312 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel");
313 for (int i = 0; i < cache_size; i++)
314 _pc_descs[i] = initial_pc_desc;
315 }
316
317 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) {
318 NOT_PRODUCT(++nmethod_stats.pc_desc_queries);
319 NOT_PRODUCT(if (approximate) ++nmethod_stats.pc_desc_approx);
320
321 // Note: one might think that caching the most recently
322 // read value separately would be a win, but one would be
323 // wrong. When many threads are updating it, the cache
324 // line it's in would bounce between caches, negating
325 // any benefit.
326
327 // In order to prevent race conditions do not load cache elements
328 // repeatedly, but use a local copy:
329 PcDesc* res;
330
331 // Step one: Check the most recently added value.
332 res = _pc_descs[0];
333 if (res == NULL) return NULL; // native method; no PcDescs at all
334 if (match_desc(res, pc_offset, approximate)) {
335 NOT_PRODUCT(++nmethod_stats.pc_desc_repeats);
336 return res;
337 }
338
339 // Step two: Check the rest of the LRU cache.
340 for (int i = 1; i < cache_size; ++i) {
341 res = _pc_descs[i];
342 if (res->pc_offset() < 0) break; // optimization: skip empty cache
343 if (match_desc(res, pc_offset, approximate)) {
344 NOT_PRODUCT(++nmethod_stats.pc_desc_hits);
345 return res;
346 }
347 }
348
349 // Report failure.
350 return NULL;
351 }
352
353 void PcDescCache::add_pc_desc(PcDesc* pc_desc) {
354 NOT_PRODUCT(++nmethod_stats.pc_desc_adds);
355 // Update the LRU cache by shifting pc_desc forward.
356 for (int i = 0; i < cache_size; i++) {
357 PcDesc* next = _pc_descs[i];
358 _pc_descs[i] = pc_desc;
359 pc_desc = next;
360 }
361 }
362
363 // adjust pcs_size so that it is a multiple of both oopSize and
364 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple
365 // of oopSize, then 2*sizeof(PcDesc) is)
366 static int adjust_pcs_size(int pcs_size) {
367 int nsize = round_to(pcs_size, oopSize);
368 if ((nsize % sizeof(PcDesc)) != 0) {
369 nsize = pcs_size + sizeof(PcDesc);
370 }
371 assert((nsize % oopSize) == 0, "correct alignment");
372 return nsize;
373 }
374
375 //-----------------------------------------------------------------------------
376
377
378 void nmethod::add_exception_cache_entry(ExceptionCache* new_entry) {
379 assert(ExceptionCache_lock->owned_by_self(),"Must hold the ExceptionCache_lock");
380 assert(new_entry != NULL,"Must be non null");
381 assert(new_entry->next() == NULL, "Must be null");
382
383 if (exception_cache() != NULL) {
384 new_entry->set_next(exception_cache());
385 }
386 set_exception_cache(new_entry);
387 }
388
389 void nmethod::clean_exception_cache(BoolObjectClosure* is_alive) {
390 ExceptionCache* prev = NULL;
391 ExceptionCache* curr = exception_cache();
392
393 while (curr != NULL) {
394 ExceptionCache* next = curr->next();
395
396 Klass* ex_klass = curr->exception_type();
397 if (ex_klass != NULL && !ex_klass->is_loader_alive(is_alive)) {
398 if (prev == NULL) {
399 set_exception_cache(next);
400 } else {
401 prev->set_next(next);
402 }
403 delete curr;
404 // prev stays the same.
405 } else {
406 prev = curr;
407 }
408
409 curr = next;
410 }
411 }
412
413 // public method for accessing the exception cache
414 // These are the public access methods.
415 address nmethod::handler_for_exception_and_pc(Handle exception, address pc) {
416 // We never grab a lock to read the exception cache, so we may
417 // have false negatives. This is okay, as it can only happen during
418 // the first few exception lookups for a given nmethod.
419 ExceptionCache* ec = exception_cache();
420 while (ec != NULL) {
421 address ret_val;
422 if ((ret_val = ec->match(exception,pc)) != NULL) {
423 return ret_val;
424 }
425 ec = ec->next();
426 }
427 return NULL;
428 }
429
430
431 void nmethod::add_handler_for_exception_and_pc(Handle exception, address pc, address handler) {
432 // There are potential race conditions during exception cache updates, so we
433 // must own the ExceptionCache_lock before doing ANY modifications. Because
434 // we don't lock during reads, it is possible to have several threads attempt
435 // to update the cache with the same data. We need to check for already inserted
436 // copies of the current data before adding it.
437
438 MutexLocker ml(ExceptionCache_lock);
439 ExceptionCache* target_entry = exception_cache_entry_for_exception(exception);
440
441 if (target_entry == NULL || !target_entry->add_address_and_handler(pc,handler)) {
442 target_entry = new ExceptionCache(exception,pc,handler);
443 add_exception_cache_entry(target_entry);
444 }
445 }
446
447
448 //-------------end of code for ExceptionCache--------------
449
450
451 int nmethod::total_size() const {
452 return
453 consts_size() +
454 insts_size() +
455 stub_size() +
456 scopes_data_size() +
457 scopes_pcs_size() +
458 handler_table_size() +
459 nul_chk_table_size();
460 }
461
462 const char* nmethod::compile_kind() const {
463 if (is_osr_method()) return "osr";
464 if (method() != NULL && is_native_method()) return "c2n";
465 return NULL;
466 }
467
468 // Fill in default values for various flag fields
469 void nmethod::init_defaults() {
470 _state = in_use;
471 _unloading_clock = 0;
472 _marked_for_reclamation = 0;
473 _has_flushed_dependencies = 0;
474 _has_unsafe_access = 0;
475 _has_method_handle_invokes = 0;
476 _lazy_critical_native = 0;
477 _has_wide_vectors = 0;
478 _marked_for_deoptimization = 0;
479 _lock_count = 0;
480 _stack_traversal_mark = 0;
481 _unload_reported = false; // jvmti state
482
483 #ifdef ASSERT
484 _oops_are_stale = false;
485 #endif
486
487 _oops_do_mark_link = NULL;
488 _jmethod_id = NULL;
489 _osr_link = NULL;
490 if (UseG1GC) {
491 _unloading_next = NULL;
492 } else {
493 _scavenge_root_link = NULL;
494 }
495 _scavenge_root_state = 0;
496 _compiler = NULL;
497 #if INCLUDE_RTM_OPT
498 _rtm_state = NoRTM;
499 #endif
500 #ifdef HAVE_DTRACE_H
501 _trap_offset = 0;
502 #endif // def HAVE_DTRACE_H
503 }
504
505 nmethod* nmethod::new_native_nmethod(methodHandle method,
506 int compile_id,
507 CodeBuffer *code_buffer,
508 int vep_offset,
509 int frame_complete,
510 int frame_size,
511 ByteSize basic_lock_owner_sp_offset,
512 ByteSize basic_lock_sp_offset,
513 OopMapSet* oop_maps) {
514 code_buffer->finalize_oop_references(method);
515 // create nmethod
516 nmethod* nm = NULL;
517 {
518 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
519 int native_nmethod_size = allocation_size(code_buffer, sizeof(nmethod));
520 CodeOffsets offsets;
521 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
522 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
523 nm = new (native_nmethod_size) nmethod(method(), native_nmethod_size,
524 compile_id, &offsets,
525 code_buffer, frame_size,
526 basic_lock_owner_sp_offset,
527 basic_lock_sp_offset, oop_maps);
528 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_native_nmethod(nm));
529 if (PrintAssembly && nm != NULL) {
530 Disassembler::decode(nm);
531 }
532 }
533 // verify nmethod
534 debug_only(if (nm) nm->verify();) // might block
535
536 if (nm != NULL) {
537 nm->log_new_nmethod();
538 }
539
540 return nm;
541 }
542
543 #ifdef HAVE_DTRACE_H
544 nmethod* nmethod::new_dtrace_nmethod(methodHandle method,
545 CodeBuffer *code_buffer,
546 int vep_offset,
547 int trap_offset,
548 int frame_complete,
549 int frame_size) {
550 code_buffer->finalize_oop_references(method);
551 // create nmethod
552 nmethod* nm = NULL;
553 {
554 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
555 int nmethod_size = allocation_size(code_buffer, sizeof(nmethod));
556 CodeOffsets offsets;
557 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
558 offsets.set_value(CodeOffsets::Dtrace_trap, trap_offset);
559 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
560
561 nm = new (nmethod_size) nmethod(method(), nmethod_size,
562 &offsets, code_buffer, frame_size);
563
564 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_nmethod(nm));
565 if (PrintAssembly && nm != NULL) {
566 Disassembler::decode(nm);
567 }
568 }
569 // verify nmethod
570 debug_only(if (nm) nm->verify();) // might block
571
572 if (nm != NULL) {
573 nm->log_new_nmethod();
574 }
575
576 return nm;
577 }
578
579 #endif // def HAVE_DTRACE_H
580
581 nmethod* nmethod::new_nmethod(methodHandle method,
582 int compile_id,
583 int entry_bci,
584 CodeOffsets* offsets,
585 int orig_pc_offset,
586 DebugInformationRecorder* debug_info,
587 Dependencies* dependencies,
588 CodeBuffer* code_buffer, int frame_size,
589 OopMapSet* oop_maps,
590 ExceptionHandlerTable* handler_table,
591 ImplicitExceptionTable* nul_chk_table,
592 AbstractCompiler* compiler,
593 int comp_level
594 )
595 {
596 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
597 code_buffer->finalize_oop_references(method);
598 // create nmethod
599 nmethod* nm = NULL;
600 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
601 int nmethod_size =
602 allocation_size(code_buffer, sizeof(nmethod))
603 + adjust_pcs_size(debug_info->pcs_size())
604 + round_to(dependencies->size_in_bytes() , oopSize)
605 + round_to(handler_table->size_in_bytes(), oopSize)
606 + round_to(nul_chk_table->size_in_bytes(), oopSize)
607 + round_to(debug_info->data_size() , oopSize);
608
609 nm = new (nmethod_size)
610 nmethod(method(), nmethod_size, compile_id, entry_bci, offsets,
611 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size,
612 oop_maps,
613 handler_table,
614 nul_chk_table,
615 compiler,
616 comp_level);
617
618 if (nm != NULL) {
619 // To make dependency checking during class loading fast, record
620 // the nmethod dependencies in the classes it is dependent on.
621 // This allows the dependency checking code to simply walk the
622 // class hierarchy above the loaded class, checking only nmethods
623 // which are dependent on those classes. The slow way is to
624 // check every nmethod for dependencies which makes it linear in
625 // the number of methods compiled. For applications with a lot
626 // classes the slow way is too slow.
627 for (Dependencies::DepStream deps(nm); deps.next(); ) {
628 Klass* klass = deps.context_type();
629 if (klass == NULL) {
630 continue; // ignore things like evol_method
631 }
632
633 // record this nmethod as dependent on this klass
634 InstanceKlass::cast(klass)->add_dependent_nmethod(nm);
635 }
636 NOT_PRODUCT(nmethod_stats.note_nmethod(nm));
637 if (PrintAssembly || CompilerOracle::has_option_string(method, "PrintAssembly")) {
638 Disassembler::decode(nm);
639 }
640 }
641 }
642 // Do verification and logging outside CodeCache_lock.
643 if (nm != NULL) {
644 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
645 DEBUG_ONLY(nm->verify();)
646 nm->log_new_nmethod();
647 }
648 return nm;
649 }
650
651
652 // For native wrappers
653 nmethod::nmethod(
654 Method* method,
655 int nmethod_size,
656 int compile_id,
657 CodeOffsets* offsets,
658 CodeBuffer* code_buffer,
659 int frame_size,
660 ByteSize basic_lock_owner_sp_offset,
661 ByteSize basic_lock_sp_offset,
662 OopMapSet* oop_maps )
663 : CodeBlob("native nmethod", code_buffer, sizeof(nmethod),
664 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps),
665 _native_receiver_sp_offset(basic_lock_owner_sp_offset),
666 _native_basic_lock_sp_offset(basic_lock_sp_offset)
667 {
668 {
669 debug_only(No_Safepoint_Verifier nsv;)
670 assert_locked_or_safepoint(CodeCache_lock);
671
672 init_defaults();
673 _method = method;
674 _entry_bci = InvocationEntryBci;
675 // We have no exception handler or deopt handler make the
676 // values something that will never match a pc like the nmethod vtable entry
677 _exception_offset = 0;
678 _deoptimize_offset = 0;
679 _deoptimize_mh_offset = 0;
680 _orig_pc_offset = 0;
681
682 _consts_offset = data_offset();
683 _stub_offset = data_offset();
684 _oops_offset = data_offset();
685 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize);
686 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize);
687 _scopes_pcs_offset = _scopes_data_offset;
688 _dependencies_offset = _scopes_pcs_offset;
689 _handler_table_offset = _dependencies_offset;
690 _nul_chk_table_offset = _handler_table_offset;
691 _nmethod_end_offset = _nul_chk_table_offset;
692 _compile_id = compile_id;
693 _comp_level = CompLevel_none;
694 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
695 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
696 _osr_entry_point = NULL;
697 _exception_cache = NULL;
698 _pc_desc_cache.reset_to(NULL);
699 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
700
701 code_buffer->copy_values_to(this);
702 if (ScavengeRootsInCode) {
703 if (detect_scavenge_root_oops()) {
704 CodeCache::add_scavenge_root_nmethod(this);
705 }
706 Universe::heap()->register_nmethod(this);
707 }
708 debug_only(verify_scavenge_root_oops());
709 CodeCache::commit(this);
710 }
711
712 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
713 ttyLocker ttyl; // keep the following output all in one block
714 // This output goes directly to the tty, not the compiler log.
715 // To enable tools to match it up with the compilation activity,
716 // be sure to tag this tty output with the compile ID.
717 if (xtty != NULL) {
718 xtty->begin_head("print_native_nmethod");
719 xtty->method(_method);
720 xtty->stamp();
721 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
722 }
723 // print the header part first
724 print();
725 // then print the requested information
726 if (PrintNativeNMethods) {
727 print_code();
728 if (oop_maps != NULL) {
729 oop_maps->print();
730 }
731 }
732 if (PrintRelocations) {
733 print_relocations();
734 }
735 if (xtty != NULL) {
736 xtty->tail("print_native_nmethod");
737 }
738 }
739 }
740
741 // For dtrace wrappers
742 #ifdef HAVE_DTRACE_H
743 nmethod::nmethod(
744 Method* method,
745 int nmethod_size,
746 CodeOffsets* offsets,
747 CodeBuffer* code_buffer,
748 int frame_size)
749 : CodeBlob("dtrace nmethod", code_buffer, sizeof(nmethod),
750 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, NULL),
751 _native_receiver_sp_offset(in_ByteSize(-1)),
752 _native_basic_lock_sp_offset(in_ByteSize(-1))
753 {
754 {
755 debug_only(No_Safepoint_Verifier nsv;)
756 assert_locked_or_safepoint(CodeCache_lock);
757
758 init_defaults();
759 _method = method;
760 _entry_bci = InvocationEntryBci;
761 // We have no exception handler or deopt handler make the
762 // values something that will never match a pc like the nmethod vtable entry
763 _exception_offset = 0;
764 _deoptimize_offset = 0;
765 _deoptimize_mh_offset = 0;
766 _unwind_handler_offset = -1;
767 _trap_offset = offsets->value(CodeOffsets::Dtrace_trap);
768 _orig_pc_offset = 0;
769 _consts_offset = data_offset();
770 _stub_offset = data_offset();
771 _oops_offset = data_offset();
772 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize);
773 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize);
774 _scopes_pcs_offset = _scopes_data_offset;
775 _dependencies_offset = _scopes_pcs_offset;
776 _handler_table_offset = _dependencies_offset;
777 _nul_chk_table_offset = _handler_table_offset;
778 _nmethod_end_offset = _nul_chk_table_offset;
779 _compile_id = 0; // default
780 _comp_level = CompLevel_none;
781 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
782 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
783 _osr_entry_point = NULL;
784 _exception_cache = NULL;
785 _pc_desc_cache.reset_to(NULL);
786 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
787
788 code_buffer->copy_values_to(this);
789 if (ScavengeRootsInCode) {
790 if (detect_scavenge_root_oops()) {
791 CodeCache::add_scavenge_root_nmethod(this);
792 }
793 Universe::heap()->register_nmethod(this);
794 }
795 DEBUG_ONLY(verify_scavenge_root_oops();)
796 CodeCache::commit(this);
797 }
798
799 if (PrintNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
800 ttyLocker ttyl; // keep the following output all in one block
801 // This output goes directly to the tty, not the compiler log.
802 // To enable tools to match it up with the compilation activity,
803 // be sure to tag this tty output with the compile ID.
804 if (xtty != NULL) {
805 xtty->begin_head("print_dtrace_nmethod");
806 xtty->method(_method);
807 xtty->stamp();
808 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
809 }
810 // print the header part first
811 print();
812 // then print the requested information
813 if (PrintNMethods) {
814 print_code();
815 }
816 if (PrintRelocations) {
817 print_relocations();
818 }
819 if (xtty != NULL) {
820 xtty->tail("print_dtrace_nmethod");
821 }
822 }
823 }
824 #endif // def HAVE_DTRACE_H
825
826 void* nmethod::operator new(size_t size, int nmethod_size) throw() {
827 // Not critical, may return null if there is too little continuous memory
828 return CodeCache::allocate(nmethod_size);
829 }
830
831 nmethod::nmethod(
832 Method* method,
833 int nmethod_size,
834 int compile_id,
835 int entry_bci,
836 CodeOffsets* offsets,
837 int orig_pc_offset,
838 DebugInformationRecorder* debug_info,
839 Dependencies* dependencies,
840 CodeBuffer *code_buffer,
841 int frame_size,
842 OopMapSet* oop_maps,
843 ExceptionHandlerTable* handler_table,
844 ImplicitExceptionTable* nul_chk_table,
845 AbstractCompiler* compiler,
846 int comp_level
847 )
848 : CodeBlob("nmethod", code_buffer, sizeof(nmethod),
849 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps),
850 _native_receiver_sp_offset(in_ByteSize(-1)),
851 _native_basic_lock_sp_offset(in_ByteSize(-1))
852 {
853 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
854 {
855 debug_only(No_Safepoint_Verifier nsv;)
856 assert_locked_or_safepoint(CodeCache_lock);
857
858 init_defaults();
859 _method = method;
860 _entry_bci = entry_bci;
861 _compile_id = compile_id;
862 _comp_level = comp_level;
863 _compiler = compiler;
864 _orig_pc_offset = orig_pc_offset;
865 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
866
867 // Section offsets
868 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts());
869 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs());
870
871 // Exception handler and deopt handler are in the stub section
872 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set");
873 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set");
874 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
875 _deoptimize_offset = _stub_offset + offsets->value(CodeOffsets::Deopt);
876 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
877 _deoptimize_mh_offset = _stub_offset + offsets->value(CodeOffsets::DeoptMH);
878 } else {
879 _deoptimize_mh_offset = -1;
880 }
881 if (offsets->value(CodeOffsets::UnwindHandler) != -1) {
882 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler);
883 } else {
884 _unwind_handler_offset = -1;
885 }
886
887 _oops_offset = data_offset();
888 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize);
889 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize);
890
891 _scopes_pcs_offset = _scopes_data_offset + round_to(debug_info->data_size (), oopSize);
892 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
893 _handler_table_offset = _dependencies_offset + round_to(dependencies->size_in_bytes (), oopSize);
894 _nul_chk_table_offset = _handler_table_offset + round_to(handler_table->size_in_bytes(), oopSize);
895 _nmethod_end_offset = _nul_chk_table_offset + round_to(nul_chk_table->size_in_bytes(), oopSize);
896
897 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
898 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
899 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry);
900 _exception_cache = NULL;
901 _pc_desc_cache.reset_to(scopes_pcs_begin());
902
903 // Copy contents of ScopeDescRecorder to nmethod
904 code_buffer->copy_values_to(this);
905 debug_info->copy_to(this);
906 dependencies->copy_to(this);
907 if (ScavengeRootsInCode) {
908 if (detect_scavenge_root_oops()) {
909 CodeCache::add_scavenge_root_nmethod(this);
910 }
911 Universe::heap()->register_nmethod(this);
912 }
913 debug_only(verify_scavenge_root_oops());
914
915 CodeCache::commit(this);
916
917 // Copy contents of ExceptionHandlerTable to nmethod
918 handler_table->copy_to(this);
919 nul_chk_table->copy_to(this);
920
921 // we use the information of entry points to find out if a method is
922 // static or non static
923 assert(compiler->is_c2() ||
924 _method->is_static() == (entry_point() == _verified_entry_point),
925 " entry points must be same for static methods and vice versa");
926 }
927
928 bool printnmethods = PrintNMethods
929 || CompilerOracle::should_print(_method)
930 || CompilerOracle::has_option_string(_method, "PrintNMethods");
931 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
932 print_nmethod(printnmethods);
933 }
934 }
935
936
937 // Print a short set of xml attributes to identify this nmethod. The
938 // output should be embedded in some other element.
939 void nmethod::log_identity(xmlStream* log) const {
940 log->print(" compile_id='%d'", compile_id());
941 const char* nm_kind = compile_kind();
942 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind);
943 if (compiler() != NULL) {
944 log->print(" compiler='%s'", compiler()->name());
945 }
946 if (TieredCompilation) {
947 log->print(" level='%d'", comp_level());
948 }
949 }
950
951
952 #define LOG_OFFSET(log, name) \
953 if ((intptr_t)name##_end() - (intptr_t)name##_begin()) \
954 log->print(" " XSTR(name) "_offset='%d'" , \
955 (intptr_t)name##_begin() - (intptr_t)this)
956
957
958 void nmethod::log_new_nmethod() const {
959 if (LogCompilation && xtty != NULL) {
960 ttyLocker ttyl;
961 HandleMark hm;
962 xtty->begin_elem("nmethod");
963 log_identity(xtty);
964 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", code_begin(), size());
965 xtty->print(" address='" INTPTR_FORMAT "'", (intptr_t) this);
966
967 LOG_OFFSET(xtty, relocation);
968 LOG_OFFSET(xtty, consts);
969 LOG_OFFSET(xtty, insts);
970 LOG_OFFSET(xtty, stub);
971 LOG_OFFSET(xtty, scopes_data);
972 LOG_OFFSET(xtty, scopes_pcs);
973 LOG_OFFSET(xtty, dependencies);
974 LOG_OFFSET(xtty, handler_table);
975 LOG_OFFSET(xtty, nul_chk_table);
976 LOG_OFFSET(xtty, oops);
977
978 xtty->method(method());
979 xtty->stamp();
980 xtty->end_elem();
981 }
982 }
983
984 #undef LOG_OFFSET
985
986
987 // Print out more verbose output usually for a newly created nmethod.
988 void nmethod::print_on(outputStream* st, const char* msg) const {
989 if (st != NULL) {
990 ttyLocker ttyl;
991 if (WizardMode) {
992 CompileTask::print_compilation(st, this, msg, /*short_form:*/ true);
993 st->print_cr(" (" INTPTR_FORMAT ")", this);
994 } else {
995 CompileTask::print_compilation(st, this, msg, /*short_form:*/ false);
996 }
997 }
998 }
999
1000
1001 void nmethod::print_nmethod(bool printmethod) {
1002 ttyLocker ttyl; // keep the following output all in one block
1003 if (xtty != NULL) {
1004 xtty->begin_head("print_nmethod");
1005 xtty->stamp();
1006 xtty->end_head();
1007 }
1008 // print the header part first
1009 print();
1010 // then print the requested information
1011 if (printmethod) {
1012 print_code();
1013 print_pcs();
1014 if (oop_maps()) {
1015 oop_maps()->print();
1016 }
1017 }
1018 if (PrintDebugInfo) {
1019 print_scopes();
1020 }
1021 if (PrintRelocations) {
1022 print_relocations();
1023 }
1024 if (PrintDependencies) {
1025 print_dependencies();
1026 }
1027 if (PrintExceptionHandlers) {
1028 print_handler_table();
1029 print_nul_chk_table();
1030 }
1031 if (xtty != NULL) {
1032 xtty->tail("print_nmethod");
1033 }
1034 }
1035
1036
1037 // Promote one word from an assembly-time handle to a live embedded oop.
1038 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
1039 if (handle == NULL ||
1040 // As a special case, IC oops are initialized to 1 or -1.
1041 handle == (jobject) Universe::non_oop_word()) {
1042 (*dest) = (oop) handle;
1043 } else {
1044 (*dest) = JNIHandles::resolve_non_null(handle);
1045 }
1046 }
1047
1048
1049 // Have to have the same name because it's called by a template
1050 void nmethod::copy_values(GrowableArray<jobject>* array) {
1051 int length = array->length();
1052 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
1053 oop* dest = oops_begin();
1054 for (int index = 0 ; index < length; index++) {
1055 initialize_immediate_oop(&dest[index], array->at(index));
1056 }
1057
1058 // Now we can fix up all the oops in the code. We need to do this
1059 // in the code because the assembler uses jobjects as placeholders.
1060 // The code and relocations have already been initialized by the
1061 // CodeBlob constructor, so it is valid even at this early point to
1062 // iterate over relocations and patch the code.
1063 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true);
1064 }
1065
1066 void nmethod::copy_values(GrowableArray<Metadata*>* array) {
1067 int length = array->length();
1068 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough");
1069 Metadata** dest = metadata_begin();
1070 for (int index = 0 ; index < length; index++) {
1071 dest[index] = array->at(index);
1072 }
1073 }
1074
1075 bool nmethod::is_at_poll_return(address pc) {
1076 RelocIterator iter(this, pc, pc+1);
1077 while (iter.next()) {
1078 if (iter.type() == relocInfo::poll_return_type)
1079 return true;
1080 }
1081 return false;
1082 }
1083
1084
1085 bool nmethod::is_at_poll_or_poll_return(address pc) {
1086 RelocIterator iter(this, pc, pc+1);
1087 while (iter.next()) {
1088 relocInfo::relocType t = iter.type();
1089 if (t == relocInfo::poll_return_type || t == relocInfo::poll_type)
1090 return true;
1091 }
1092 return false;
1093 }
1094
1095
1096 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) {
1097 // re-patch all oop-bearing instructions, just in case some oops moved
1098 RelocIterator iter(this, begin, end);
1099 while (iter.next()) {
1100 if (iter.type() == relocInfo::oop_type) {
1101 oop_Relocation* reloc = iter.oop_reloc();
1102 if (initialize_immediates && reloc->oop_is_immediate()) {
1103 oop* dest = reloc->oop_addr();
1104 initialize_immediate_oop(dest, (jobject) *dest);
1105 }
1106 // Refresh the oop-related bits of this instruction.
1107 reloc->fix_oop_relocation();
1108 } else if (iter.type() == relocInfo::metadata_type) {
1109 metadata_Relocation* reloc = iter.metadata_reloc();
1110 reloc->fix_metadata_relocation();
1111 }
1112 }
1113 }
1114
1115
1116 void nmethod::verify_oop_relocations() {
1117 // Ensure sure that the code matches the current oop values
1118 RelocIterator iter(this, NULL, NULL);
1119 while (iter.next()) {
1120 if (iter.type() == relocInfo::oop_type) {
1121 oop_Relocation* reloc = iter.oop_reloc();
1122 if (!reloc->oop_is_immediate()) {
1123 reloc->verify_oop_relocation();
1124 }
1125 }
1126 }
1127 }
1128
1129
1130 ScopeDesc* nmethod::scope_desc_at(address pc) {
1131 PcDesc* pd = pc_desc_at(pc);
1132 guarantee(pd != NULL, "scope must be present");
1133 return new ScopeDesc(this, pd->scope_decode_offset(),
1134 pd->obj_decode_offset(), pd->should_reexecute(),
1135 pd->return_oop());
1136 }
1137
1138
1139 void nmethod::clear_inline_caches() {
1140 assert(SafepointSynchronize::is_at_safepoint(), "cleaning of IC's only allowed at safepoint");
1141 if (is_zombie()) {
1142 return;
1143 }
1144
1145 RelocIterator iter(this);
1146 while (iter.next()) {
1147 iter.reloc()->clear_inline_cache();
1148 }
1149 }
1150
1151
1152 void nmethod::cleanup_inline_caches() {
1153
1154 assert_locked_or_safepoint(CompiledIC_lock);
1155
1156 // If the method is not entrant or zombie then a JMP is plastered over the
1157 // first few bytes. If an oop in the old code was there, that oop
1158 // should not get GC'd. Skip the first few bytes of oops on
1159 // not-entrant methods.
1160 address low_boundary = verified_entry_point();
1161 if (!is_in_use()) {
1162 low_boundary += NativeJump::instruction_size;
1163 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1164 // This means that the low_boundary is going to be a little too high.
1165 // This shouldn't matter, since oops of non-entrant methods are never used.
1166 // In fact, why are we bothering to look at oops in a non-entrant method??
1167 }
1168
1169 // Find all calls in an nmethod, and clear the ones that points to zombie methods
1170 ResourceMark rm;
1171 RelocIterator iter(this, low_boundary);
1172 while(iter.next()) {
1173 switch(iter.type()) {
1174 case relocInfo::virtual_call_type:
1175 case relocInfo::opt_virtual_call_type: {
1176 CompiledIC *ic = CompiledIC_at(&iter);
1177 // Ok, to lookup references to zombies here
1178 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
1179 if( cb != NULL && cb->is_nmethod() ) {
1180 nmethod* nm = (nmethod*)cb;
1181 // Clean inline caches pointing to both zombie and not_entrant methods
1182 if (!nm->is_in_use() || (nm->method()->code() != nm)) ic->set_to_clean();
1183 }
1184 break;
1185 }
1186 case relocInfo::static_call_type: {
1187 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
1188 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
1189 if( cb != NULL && cb->is_nmethod() ) {
1190 nmethod* nm = (nmethod*)cb;
1191 // Clean inline caches pointing to both zombie and not_entrant methods
1192 if (!nm->is_in_use() || (nm->method()->code() != nm)) csc->set_to_clean();
1193 }
1194 break;
1195 }
1196 }
1197 }
1198 }
1199
1200 void nmethod::verify_clean_inline_caches() {
1201 assert_locked_or_safepoint(CompiledIC_lock);
1202
1203 // If the method is not entrant or zombie then a JMP is plastered over the
1204 // first few bytes. If an oop in the old code was there, that oop
1205 // should not get GC'd. Skip the first few bytes of oops on
1206 // not-entrant methods.
1207 address low_boundary = verified_entry_point();
1208 if (!is_in_use()) {
1209 low_boundary += NativeJump::instruction_size;
1210 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1211 // This means that the low_boundary is going to be a little too high.
1212 // This shouldn't matter, since oops of non-entrant methods are never used.
1213 // In fact, why are we bothering to look at oops in a non-entrant method??
1214 }
1215
1216 ResourceMark rm;
1217 RelocIterator iter(this, low_boundary);
1218 while(iter.next()) {
1219 switch(iter.type()) {
1220 case relocInfo::virtual_call_type:
1221 case relocInfo::opt_virtual_call_type: {
1222 CompiledIC *ic = CompiledIC_at(&iter);
1223 // Ok, to lookup references to zombies here
1224 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
1225 if( cb != NULL && cb->is_nmethod() ) {
1226 nmethod* nm = (nmethod*)cb;
1227 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
1228 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1229 assert(ic->is_clean(), "IC should be clean");
1230 }
1231 }
1232 break;
1233 }
1234 case relocInfo::static_call_type: {
1235 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
1236 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
1237 if( cb != NULL && cb->is_nmethod() ) {
1238 nmethod* nm = (nmethod*)cb;
1239 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
1240 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1241 assert(csc->is_clean(), "IC should be clean");
1242 }
1243 }
1244 break;
1245 }
1246 }
1247 }
1248 }
1249
1250 int nmethod::verify_icholder_relocations() {
1251 int count = 0;
1252
1253 RelocIterator iter(this);
1254 while(iter.next()) {
1255 if (iter.type() == relocInfo::virtual_call_type) {
1256 if (CompiledIC::is_icholder_call_site(iter.virtual_call_reloc())) {
1257 CompiledIC *ic = CompiledIC_at(&iter);
1258 if (TraceCompiledIC) {
1259 tty->print("noticed icholder " INTPTR_FORMAT " ", p2i(ic->cached_icholder()));
1260 ic->print();
1261 }
1262 assert(ic->cached_icholder() != NULL, "must be non-NULL");
1263 count++;
1264 }
1265 }
1266 }
1267
1268 return count;
1269 }
1270
1271 // This is a private interface with the sweeper.
1272 void nmethod::mark_as_seen_on_stack() {
1273 assert(is_alive(), "Must be an alive method");
1274 // Set the traversal mark to ensure that the sweeper does 2
1275 // cleaning passes before moving to zombie.
1276 set_stack_traversal_mark(NMethodSweeper::traversal_count());
1277 }
1278
1279 // Tell if a non-entrant method can be converted to a zombie (i.e.,
1280 // there are no activations on the stack, not in use by the VM,
1281 // and not in use by the ServiceThread)
1282 bool nmethod::can_not_entrant_be_converted() {
1283 assert(is_not_entrant(), "must be a non-entrant method");
1284
1285 // Since the nmethod sweeper only does partial sweep the sweeper's traversal
1286 // count can be greater than the stack traversal count before it hits the
1287 // nmethod for the second time.
1288 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count() &&
1289 !is_locked_by_vm();
1290 }
1291
1292 void nmethod::inc_decompile_count() {
1293 if (!is_compiled_by_c2()) return;
1294 // Could be gated by ProfileTraps, but do not bother...
1295 Method* m = method();
1296 if (m == NULL) return;
1297 MethodData* mdo = m->method_data();
1298 if (mdo == NULL) return;
1299 // There is a benign race here. See comments in methodData.hpp.
1300 mdo->inc_decompile_count();
1301 }
1302
1303 void nmethod::increase_unloading_clock() {
1304 _global_unloading_clock++;
1305 if (_global_unloading_clock == 0) {
1306 // _nmethods are allocated with _unloading_clock == 0,
1307 // so 0 is never used as a clock value.
1308 _global_unloading_clock = 1;
1309 }
1310 }
1311
1312 void nmethod::set_unloading_clock(unsigned char unloading_clock) {
1313 OrderAccess::release_store((volatile jubyte*)&_unloading_clock, unloading_clock);
1314 }
1315
1316 unsigned char nmethod::unloading_clock() {
1317 return (unsigned char)OrderAccess::load_acquire((volatile jubyte*)&_unloading_clock);
1318 }
1319
1320 void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) {
1321
1322 post_compiled_method_unload();
1323
1324 // Since this nmethod is being unloaded, make sure that dependencies
1325 // recorded in instanceKlasses get flushed and pass non-NULL closure to
1326 // indicate that this work is being done during a GC.
1327 assert(Universe::heap()->is_gc_active(), "should only be called during gc");
1328 assert(is_alive != NULL, "Should be non-NULL");
1329 // A non-NULL is_alive closure indicates that this is being called during GC.
1330 flush_dependencies(is_alive);
1331
1332 // Break cycle between nmethod & method
1333 if (TraceClassUnloading && WizardMode) {
1334 tty->print_cr("[Class unloading: Making nmethod " INTPTR_FORMAT
1335 " unloadable], Method*(" INTPTR_FORMAT
1336 "), cause(" INTPTR_FORMAT ")",
1337 this, (address)_method, (address)cause);
1338 if (!Universe::heap()->is_gc_active())
1339 cause->klass()->print();
1340 }
1341 // Unlink the osr method, so we do not look this up again
1342 if (is_osr_method()) {
1343 invalidate_osr_method();
1344 }
1345 // If _method is already NULL the Method* is about to be unloaded,
1346 // so we don't have to break the cycle. Note that it is possible to
1347 // have the Method* live here, in case we unload the nmethod because
1348 // it is pointing to some oop (other than the Method*) being unloaded.
1349 if (_method != NULL) {
1350 // OSR methods point to the Method*, but the Method* does not
1351 // point back!
1352 if (_method->code() == this) {
1353 _method->clear_code(); // Break a cycle
1354 }
1355 _method = NULL; // Clear the method of this dead nmethod
1356 }
1357 // Make the class unloaded - i.e., change state and notify sweeper
1358 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
1359 if (is_in_use()) {
1360 // Transitioning directly from live to unloaded -- so
1361 // we need to force a cache clean-up; remember this
1362 // for later on.
1363 CodeCache::set_needs_cache_clean(true);
1364 }
1365
1366 // Unregister must be done before the state change
1367 Universe::heap()->unregister_nmethod(this);
1368
1369 _state = unloaded;
1370
1371 // Log the unloading.
1372 log_state_change();
1373
1374 // The Method* is gone at this point
1375 assert(_method == NULL, "Tautology");
1376
1377 set_osr_link(NULL);
1378 //set_scavenge_root_link(NULL); // done by prune_scavenge_root_nmethods
1379 NMethodSweeper::report_state_change(this);
1380 }
1381
1382 void nmethod::invalidate_osr_method() {
1383 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
1384 // Remove from list of active nmethods
1385 if (method() != NULL)
1386 method()->method_holder()->remove_osr_nmethod(this);
1387 // Set entry as invalid
1388 _entry_bci = InvalidOSREntryBci;
1389 }
1390
1391 void nmethod::log_state_change() const {
1392 if (LogCompilation) {
1393 if (xtty != NULL) {
1394 ttyLocker ttyl; // keep the following output all in one block
1395 if (_state == unloaded) {
1396 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'",
1397 os::current_thread_id());
1398 } else {
1399 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s",
1400 os::current_thread_id(),
1401 (_state == zombie ? " zombie='1'" : ""));
1402 }
1403 log_identity(xtty);
1404 xtty->stamp();
1405 xtty->end_elem();
1406 }
1407 }
1408 if (PrintCompilation && _state != unloaded) {
1409 print_on(tty, _state == zombie ? "made zombie" : "made not entrant");
1410 }
1411 }
1412
1413 /**
1414 * Common functionality for both make_not_entrant and make_zombie
1415 */
1416 bool nmethod::make_not_entrant_or_zombie(unsigned int state) {
1417 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant");
1418 assert(!is_zombie(), "should not already be a zombie");
1419
1420 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below.
1421 nmethodLocker nml(this);
1422 methodHandle the_method(method());
1423 No_Safepoint_Verifier nsv;
1424
1425 // during patching, depending on the nmethod state we must notify the GC that
1426 // code has been unloaded, unregistering it. We cannot do this right while
1427 // holding the Patching_lock because we need to use the CodeCache_lock. This
1428 // would be prone to deadlocks.
1429 // This flag is used to remember whether we need to later lock and unregister.
1430 bool nmethod_needs_unregister = false;
1431
1432 {
1433 // invalidate osr nmethod before acquiring the patching lock since
1434 // they both acquire leaf locks and we don't want a deadlock.
1435 // This logic is equivalent to the logic below for patching the
1436 // verified entry point of regular methods.
1437 if (is_osr_method()) {
1438 // this effectively makes the osr nmethod not entrant
1439 invalidate_osr_method();
1440 }
1441
1442 // Enter critical section. Does not block for safepoint.
1443 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1444
1445 if (_state == state) {
1446 // another thread already performed this transition so nothing
1447 // to do, but return false to indicate this.
1448 return false;
1449 }
1450
1451 // The caller can be calling the method statically or through an inline
1452 // cache call.
1453 if (!is_osr_method() && !is_not_entrant()) {
1454 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
1455 SharedRuntime::get_handle_wrong_method_stub());
1456 }
1457
1458 if (is_in_use()) {
1459 // It's a true state change, so mark the method as decompiled.
1460 // Do it only for transition from alive.
1461 inc_decompile_count();
1462 }
1463
1464 // If the state is becoming a zombie, signal to unregister the nmethod with
1465 // the heap.
1466 // This nmethod may have already been unloaded during a full GC.
1467 if ((state == zombie) && !is_unloaded()) {
1468 nmethod_needs_unregister = true;
1469 }
1470
1471 // Must happen before state change. Otherwise we have a race condition in
1472 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately
1473 // transition its state from 'not_entrant' to 'zombie' without having to wait
1474 // for stack scanning.
1475 if (state == not_entrant) {
1476 mark_as_seen_on_stack();
1477 OrderAccess::storestore();
1478 }
1479
1480 // Change state
1481 _state = state;
1482
1483 // Log the transition once
1484 log_state_change();
1485
1486 // Remove nmethod from method.
1487 // We need to check if both the _code and _from_compiled_code_entry_point
1488 // refer to this nmethod because there is a race in setting these two fields
1489 // in Method* as seen in bugid 4947125.
1490 // If the vep() points to the zombie nmethod, the memory for the nmethod
1491 // could be flushed and the compiler and vtable stubs could still call
1492 // through it.
1493 if (method() != NULL && (method()->code() == this ||
1494 method()->from_compiled_entry() == verified_entry_point())) {
1495 HandleMark hm;
1496 method()->clear_code();
1497 }
1498 } // leave critical region under Patching_lock
1499
1500 // When the nmethod becomes zombie it is no longer alive so the
1501 // dependencies must be flushed. nmethods in the not_entrant
1502 // state will be flushed later when the transition to zombie
1503 // happens or they get unloaded.
1504 if (state == zombie) {
1505 {
1506 // Flushing dependecies must be done before any possible
1507 // safepoint can sneak in, otherwise the oops used by the
1508 // dependency logic could have become stale.
1509 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1510 if (nmethod_needs_unregister) {
1511 Universe::heap()->unregister_nmethod(this);
1512 }
1513 flush_dependencies(NULL);
1514 }
1515
1516 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload
1517 // event and it hasn't already been reported for this nmethod then
1518 // report it now. The event may have been reported earilier if the GC
1519 // marked it for unloading). JvmtiDeferredEventQueue support means
1520 // we no longer go to a safepoint here.
1521 post_compiled_method_unload();
1522
1523 #ifdef ASSERT
1524 // It's no longer safe to access the oops section since zombie
1525 // nmethods aren't scanned for GC.
1526 _oops_are_stale = true;
1527 #endif
1528 // the Method may be reclaimed by class unloading now that the
1529 // nmethod is in zombie state
1530 set_method(NULL);
1531 } else {
1532 assert(state == not_entrant, "other cases may need to be handled differently");
1533 }
1534
1535 if (TraceCreateZombies) {
1536 tty->print_cr("nmethod <" INTPTR_FORMAT "> code made %s", this, (state == not_entrant) ? "not entrant" : "zombie");
1537 }
1538
1539 NMethodSweeper::report_state_change(this);
1540 return true;
1541 }
1542
1543 void nmethod::flush() {
1544 // Note that there are no valid oops in the nmethod anymore.
1545 assert(is_zombie() || (is_osr_method() && is_unloaded()), "must be a zombie method");
1546 assert(is_marked_for_reclamation() || (is_osr_method() && is_unloaded()), "must be marked for reclamation");
1547
1548 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed");
1549 assert_locked_or_safepoint(CodeCache_lock);
1550
1551 // completely deallocate this method
1552 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, this);
1553 if (PrintMethodFlushing) {
1554 tty->print_cr("*flushing nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT "/Free CodeCache:" SIZE_FORMAT "Kb",
1555 _compile_id, this, CodeCache::nof_blobs(), CodeCache::unallocated_capacity()/1024);
1556 }
1557
1558 // We need to deallocate any ExceptionCache data.
1559 // Note that we do not need to grab the nmethod lock for this, it
1560 // better be thread safe if we're disposing of it!
1561 ExceptionCache* ec = exception_cache();
1562 set_exception_cache(NULL);
1563 while(ec != NULL) {
1564 ExceptionCache* next = ec->next();
1565 delete ec;
1566 ec = next;
1567 }
1568
1569 if (on_scavenge_root_list()) {
1570 CodeCache::drop_scavenge_root_nmethod(this);
1571 }
1572
1573 #ifdef SHARK
1574 ((SharkCompiler *) compiler())->free_compiled_method(insts_begin());
1575 #endif // SHARK
1576
1577 ((CodeBlob*)(this))->flush();
1578
1579 CodeCache::free(this);
1580 }
1581
1582
1583 //
1584 // Notify all classes this nmethod is dependent on that it is no
1585 // longer dependent. This should only be called in two situations.
1586 // First, when a nmethod transitions to a zombie all dependents need
1587 // to be clear. Since zombification happens at a safepoint there's no
1588 // synchronization issues. The second place is a little more tricky.
1589 // During phase 1 of mark sweep class unloading may happen and as a
1590 // result some nmethods may get unloaded. In this case the flushing
1591 // of dependencies must happen during phase 1 since after GC any
1592 // dependencies in the unloaded nmethod won't be updated, so
1593 // traversing the dependency information in unsafe. In that case this
1594 // function is called with a non-NULL argument and this function only
1595 // notifies instanceKlasses that are reachable
1596
1597 void nmethod::flush_dependencies(BoolObjectClosure* is_alive) {
1598 assert_locked_or_safepoint(CodeCache_lock);
1599 assert(Universe::heap()->is_gc_active() == (is_alive != NULL),
1600 "is_alive is non-NULL if and only if we are called during GC");
1601 if (!has_flushed_dependencies()) {
1602 set_has_flushed_dependencies();
1603 for (Dependencies::DepStream deps(this); deps.next(); ) {
1604 Klass* klass = deps.context_type();
1605 if (klass == NULL) continue; // ignore things like evol_method
1606
1607 // During GC the is_alive closure is non-NULL, and is used to
1608 // determine liveness of dependees that need to be updated.
1609 if (is_alive == NULL || klass->is_loader_alive(is_alive)) {
1610 InstanceKlass::cast(klass)->remove_dependent_nmethod(this);
1611 }
1612 }
1613 }
1614 }
1615
1616
1617 // If this oop is not live, the nmethod can be unloaded.
1618 bool nmethod::can_unload(BoolObjectClosure* is_alive, oop* root, bool unloading_occurred) {
1619 assert(root != NULL, "just checking");
1620 oop obj = *root;
1621 if (obj == NULL || is_alive->do_object_b(obj)) {
1622 return false;
1623 }
1624
1625 // If ScavengeRootsInCode is true, an nmethod might be unloaded
1626 // simply because one of its constant oops has gone dead.
1627 // No actual classes need to be unloaded in order for this to occur.
1628 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading");
1629 make_unloaded(is_alive, obj);
1630 return true;
1631 }
1632
1633 // ------------------------------------------------------------------
1634 // post_compiled_method_load_event
1635 // new method for install_code() path
1636 // Transfer information from compilation to jvmti
1637 void nmethod::post_compiled_method_load_event() {
1638
1639 Method* moop = method();
1640 #ifndef USDT2
1641 HS_DTRACE_PROBE8(hotspot, compiled__method__load,
1642 moop->klass_name()->bytes(),
1643 moop->klass_name()->utf8_length(),
1644 moop->name()->bytes(),
1645 moop->name()->utf8_length(),
1646 moop->signature()->bytes(),
1647 moop->signature()->utf8_length(),
1648 insts_begin(), insts_size());
1649 #else /* USDT2 */
1650 HOTSPOT_COMPILED_METHOD_LOAD(
1651 (char *) moop->klass_name()->bytes(),
1652 moop->klass_name()->utf8_length(),
1653 (char *) moop->name()->bytes(),
1654 moop->name()->utf8_length(),
1655 (char *) moop->signature()->bytes(),
1656 moop->signature()->utf8_length(),
1657 insts_begin(), insts_size());
1658 #endif /* USDT2 */
1659
1660 if (JvmtiExport::should_post_compiled_method_load() ||
1661 JvmtiExport::should_post_compiled_method_unload()) {
1662 get_and_cache_jmethod_id();
1663 }
1664
1665 if (JvmtiExport::should_post_compiled_method_load()) {
1666 // Let the Service thread (which is a real Java thread) post the event
1667 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1668 JvmtiDeferredEventQueue::enqueue(
1669 JvmtiDeferredEvent::compiled_method_load_event(this));
1670 }
1671 }
1672
1673 jmethodID nmethod::get_and_cache_jmethod_id() {
1674 if (_jmethod_id == NULL) {
1675 // Cache the jmethod_id since it can no longer be looked up once the
1676 // method itself has been marked for unloading.
1677 _jmethod_id = method()->jmethod_id();
1678 }
1679 return _jmethod_id;
1680 }
1681
1682 void nmethod::post_compiled_method_unload() {
1683 if (unload_reported()) {
1684 // During unloading we transition to unloaded and then to zombie
1685 // and the unloading is reported during the first transition.
1686 return;
1687 }
1688
1689 assert(_method != NULL && !is_unloaded(), "just checking");
1690 DTRACE_METHOD_UNLOAD_PROBE(method());
1691
1692 // If a JVMTI agent has enabled the CompiledMethodUnload event then
1693 // post the event. Sometime later this nmethod will be made a zombie
1694 // by the sweeper but the Method* will not be valid at that point.
1695 // If the _jmethod_id is null then no load event was ever requested
1696 // so don't bother posting the unload. The main reason for this is
1697 // that the jmethodID is a weak reference to the Method* so if
1698 // it's being unloaded there's no way to look it up since the weak
1699 // ref will have been cleared.
1700 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) {
1701 assert(!unload_reported(), "already unloaded");
1702 JvmtiDeferredEvent event =
1703 JvmtiDeferredEvent::compiled_method_unload_event(this,
1704 _jmethod_id, insts_begin());
1705 if (SafepointSynchronize::is_at_safepoint()) {
1706 // Don't want to take the queueing lock. Add it as pending and
1707 // it will get enqueued later.
1708 JvmtiDeferredEventQueue::add_pending_event(event);
1709 } else {
1710 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1711 JvmtiDeferredEventQueue::enqueue(event);
1712 }
1713 }
1714
1715 // The JVMTI CompiledMethodUnload event can be enabled or disabled at
1716 // any time. As the nmethod is being unloaded now we mark it has
1717 // having the unload event reported - this will ensure that we don't
1718 // attempt to report the event in the unlikely scenario where the
1719 // event is enabled at the time the nmethod is made a zombie.
1720 set_unload_reported();
1721 }
1722
1723 void static clean_ic_if_metadata_is_dead(CompiledIC *ic, BoolObjectClosure *is_alive, bool mark_on_stack) {
1724 if (ic->is_icholder_call()) {
1725 // The only exception is compiledICHolder oops which may
1726 // yet be marked below. (We check this further below).
1727 CompiledICHolder* cichk_oop = ic->cached_icholder();
1728
1729 if (mark_on_stack) {
1730 Metadata::mark_on_stack(cichk_oop->holder_method());
1731 Metadata::mark_on_stack(cichk_oop->holder_klass());
1732 }
1733
1734 if (cichk_oop->holder_method()->method_holder()->is_loader_alive(is_alive) &&
1735 cichk_oop->holder_klass()->is_loader_alive(is_alive)) {
1736 return;
1737 }
1738 } else {
1739 Metadata* ic_oop = ic->cached_metadata();
1740 if (ic_oop != NULL) {
1741 if (mark_on_stack) {
1742 Metadata::mark_on_stack(ic_oop);
1743 }
1744
1745 if (ic_oop->is_klass()) {
1746 if (((Klass*)ic_oop)->is_loader_alive(is_alive)) {
1747 return;
1748 }
1749 } else if (ic_oop->is_method()) {
1750 if (((Method*)ic_oop)->method_holder()->is_loader_alive(is_alive)) {
1751 return;
1752 }
1753 } else {
1754 ShouldNotReachHere();
1755 }
1756 }
1757 }
1758
1759 ic->set_to_clean();
1760 }
1761
1762 // This is called at the end of the strong tracing/marking phase of a
1763 // GC to unload an nmethod if it contains otherwise unreachable
1764 // oops.
1765
1766 void nmethod::do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred) {
1767 // Make sure the oop's ready to receive visitors
1768 assert(!is_zombie() && !is_unloaded(),
1769 "should not call follow on zombie or unloaded nmethod");
1770
1771 // If the method is not entrant then a JMP is plastered over the
1772 // first few bytes. If an oop in the old code was there, that oop
1773 // should not get GC'd. Skip the first few bytes of oops on
1774 // not-entrant methods.
1775 address low_boundary = verified_entry_point();
1776 if (is_not_entrant()) {
1777 low_boundary += NativeJump::instruction_size;
1778 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1779 // (See comment above.)
1780 }
1781
1782 // The RedefineClasses() API can cause the class unloading invariant
1783 // to no longer be true. See jvmtiExport.hpp for details.
1784 // Also, leave a debugging breadcrumb in local flag.
1785 bool a_class_was_redefined = JvmtiExport::has_redefined_a_class();
1786 if (a_class_was_redefined) {
1787 // This set of the unloading_occurred flag is done before the
1788 // call to post_compiled_method_unload() so that the unloading
1789 // of this nmethod is reported.
1790 unloading_occurred = true;
1791 }
1792
1793 // Exception cache
1794 clean_exception_cache(is_alive);
1795
1796 // If class unloading occurred we first iterate over all inline caches and
1797 // clear ICs where the cached oop is referring to an unloaded klass or method.
1798 // The remaining live cached oops will be traversed in the relocInfo::oop_type
1799 // iteration below.
1800 if (unloading_occurred) {
1801 RelocIterator iter(this, low_boundary);
1802 while(iter.next()) {
1803 if (iter.type() == relocInfo::virtual_call_type) {
1804 CompiledIC *ic = CompiledIC_at(&iter);
1805 clean_ic_if_metadata_is_dead(ic, is_alive, false);
1806 }
1807 }
1808 }
1809
1810 // Compiled code
1811 {
1812 RelocIterator iter(this, low_boundary);
1813 while (iter.next()) {
1814 if (iter.type() == relocInfo::oop_type) {
1815 oop_Relocation* r = iter.oop_reloc();
1816 // In this loop, we must only traverse those oops directly embedded in
1817 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1818 assert(1 == (r->oop_is_immediate()) +
1819 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1820 "oop must be found in exactly one place");
1821 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1822 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) {
1823 return;
1824 }
1825 }
1826 }
1827 }
1828 }
1829
1830
1831 // Scopes
1832 for (oop* p = oops_begin(); p < oops_end(); p++) {
1833 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1834 if (can_unload(is_alive, p, unloading_occurred)) {
1835 return;
1836 }
1837 }
1838
1839 // Ensure that all metadata is still alive
1840 verify_metadata_loaders(low_boundary, is_alive);
1841 }
1842
1843 template <class CompiledICorStaticCall>
1844 static bool clean_if_nmethod_is_unloaded(CompiledICorStaticCall *ic, address addr, BoolObjectClosure *is_alive, nmethod* from) {
1845 // Ok, to lookup references to zombies here
1846 CodeBlob *cb = CodeCache::find_blob_unsafe(addr);
1847 if (cb != NULL && cb->is_nmethod()) {
1848 nmethod* nm = (nmethod*)cb;
1849
1850 if (nm->unloading_clock() != nmethod::global_unloading_clock()) {
1851 // The nmethod has not been processed yet.
1852 return true;
1853 }
1854
1855 // Clean inline caches pointing to both zombie and not_entrant methods
1856 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1857 ic->set_to_clean();
1858 assert(ic->is_clean(), err_msg("nmethod " PTR_FORMAT "not clean %s", from, from->method()->name_and_sig_as_C_string()));
1859 }
1860 }
1861
1862 return false;
1863 }
1864
1865 static bool clean_if_nmethod_is_unloaded(CompiledIC *ic, BoolObjectClosure *is_alive, nmethod* from) {
1866 return clean_if_nmethod_is_unloaded(ic, ic->ic_destination(), is_alive, from);
1867 }
1868
1869 static bool clean_if_nmethod_is_unloaded(CompiledStaticCall *csc, BoolObjectClosure *is_alive, nmethod* from) {
1870 return clean_if_nmethod_is_unloaded(csc, csc->destination(), is_alive, from);
1871 }
1872
1873 bool nmethod::unload_if_dead_at(RelocIterator* iter_at_oop, BoolObjectClosure *is_alive, bool unloading_occurred) {
1874 assert(iter_at_oop->type() == relocInfo::oop_type, "Wrong relocation type");
1875
1876 oop_Relocation* r = iter_at_oop->oop_reloc();
1877 // Traverse those oops directly embedded in the code.
1878 // Other oops (oop_index>0) are seen as part of scopes_oops.
1879 assert(1 == (r->oop_is_immediate()) +
1880 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1881 "oop must be found in exactly one place");
1882 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1883 // Unload this nmethod if the oop is dead.
1884 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) {
1885 return true;;
1886 }
1887 }
1888
1889 return false;
1890 }
1891
1892 void nmethod::mark_metadata_on_stack_at(RelocIterator* iter_at_metadata) {
1893 assert(iter_at_metadata->type() == relocInfo::metadata_type, "Wrong relocation type");
1894
1895 metadata_Relocation* r = iter_at_metadata->metadata_reloc();
1896 // In this metadata, we must only follow those metadatas directly embedded in
1897 // the code. Other metadatas (oop_index>0) are seen as part of
1898 // the metadata section below.
1899 assert(1 == (r->metadata_is_immediate()) +
1900 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
1901 "metadata must be found in exactly one place");
1902 if (r->metadata_is_immediate() && r->metadata_value() != NULL) {
1903 Metadata* md = r->metadata_value();
1904 if (md != _method) Metadata::mark_on_stack(md);
1905 }
1906 }
1907
1908 void nmethod::mark_metadata_on_stack_non_relocs() {
1909 // Visit the metadata section
1910 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
1911 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops
1912 Metadata* md = *p;
1913 Metadata::mark_on_stack(md);
1914 }
1915
1916 // Visit metadata not embedded in the other places.
1917 if (_method != NULL) Metadata::mark_on_stack(_method);
1918 }
1919
1920 bool nmethod::do_unloading_parallel(BoolObjectClosure* is_alive, bool unloading_occurred) {
1921 ResourceMark rm;
1922
1923 // Make sure the oop's ready to receive visitors
1924 assert(!is_zombie() && !is_unloaded(),
1925 "should not call follow on zombie or unloaded nmethod");
1926
1927 // If the method is not entrant then a JMP is plastered over the
1928 // first few bytes. If an oop in the old code was there, that oop
1929 // should not get GC'd. Skip the first few bytes of oops on
1930 // not-entrant methods.
1931 address low_boundary = verified_entry_point();
1932 if (is_not_entrant()) {
1933 low_boundary += NativeJump::instruction_size;
1934 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1935 // (See comment above.)
1936 }
1937
1938 // The RedefineClasses() API can cause the class unloading invariant
1939 // to no longer be true. See jvmtiExport.hpp for details.
1940 // Also, leave a debugging breadcrumb in local flag.
1941 bool a_class_was_redefined = JvmtiExport::has_redefined_a_class();
1942 if (a_class_was_redefined) {
1943 // This set of the unloading_occurred flag is done before the
1944 // call to post_compiled_method_unload() so that the unloading
1945 // of this nmethod is reported.
1946 unloading_occurred = true;
1947 }
1948
1949 // When class redefinition is used all metadata in the CodeCache has to be recorded,
1950 // so that unused "previous versions" can be purged. Since walking the CodeCache can
1951 // be expensive, the "mark on stack" is piggy-backed on this parallel unloading code.
1952 bool mark_metadata_on_stack = a_class_was_redefined;
1953
1954 // Exception cache
1955 clean_exception_cache(is_alive);
1956
1957 bool is_unloaded = false;
1958 bool postponed = false;
1959
1960 RelocIterator iter(this, low_boundary);
1961 while(iter.next()) {
1962
1963 switch (iter.type()) {
1964
1965 case relocInfo::virtual_call_type:
1966 if (unloading_occurred) {
1967 // If class unloading occurred we first iterate over all inline caches and
1968 // clear ICs where the cached oop is referring to an unloaded klass or method.
1969 clean_ic_if_metadata_is_dead(CompiledIC_at(&iter), is_alive, mark_metadata_on_stack);
1970 }
1971
1972 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
1973 break;
1974
1975 case relocInfo::opt_virtual_call_type:
1976 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
1977 break;
1978
1979 case relocInfo::static_call_type:
1980 postponed |= clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this);
1981 break;
1982
1983 case relocInfo::oop_type:
1984 if (!is_unloaded) {
1985 is_unloaded = unload_if_dead_at(&iter, is_alive, unloading_occurred);
1986 }
1987 break;
1988
1989 case relocInfo::metadata_type:
1990 if (mark_metadata_on_stack) {
1991 mark_metadata_on_stack_at(&iter);
1992 }
1993 }
1994 }
1995
1996 if (mark_metadata_on_stack) {
1997 mark_metadata_on_stack_non_relocs();
1998 }
1999
2000 if (is_unloaded) {
2001 return postponed;
2002 }
2003
2004 // Scopes
2005 for (oop* p = oops_begin(); p < oops_end(); p++) {
2006 if (*p == Universe::non_oop_word()) continue; // skip non-oops
2007 if (can_unload(is_alive, p, unloading_occurred)) {
2008 is_unloaded = true;
2009 break;
2010 }
2011 }
2012
2013 if (is_unloaded) {
2014 return postponed;
2015 }
2016
2017 // Ensure that all metadata is still alive
2018 verify_metadata_loaders(low_boundary, is_alive);
2019
2020 return postponed;
2021 }
2022
2023 void nmethod::do_unloading_parallel_postponed(BoolObjectClosure* is_alive, bool unloading_occurred) {
2024 ResourceMark rm;
2025
2026 // Make sure the oop's ready to receive visitors
2027 assert(!is_zombie(),
2028 "should not call follow on zombie nmethod");
2029
2030 // If the method is not entrant then a JMP is plastered over the
2031 // first few bytes. If an oop in the old code was there, that oop
2032 // should not get GC'd. Skip the first few bytes of oops on
2033 // not-entrant methods.
2034 address low_boundary = verified_entry_point();
2035 if (is_not_entrant()) {
2036 low_boundary += NativeJump::instruction_size;
2037 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
2038 // (See comment above.)
2039 }
2040
2041 RelocIterator iter(this, low_boundary);
2042 while(iter.next()) {
2043
2044 switch (iter.type()) {
2045
2046 case relocInfo::virtual_call_type:
2047 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
2048 break;
2049
2050 case relocInfo::opt_virtual_call_type:
2051 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
2052 break;
2053
2054 case relocInfo::static_call_type:
2055 clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this);
2056 break;
2057 }
2058 }
2059 }
2060
2061 #ifdef ASSERT
2062
2063 class CheckClass : AllStatic {
2064 static BoolObjectClosure* _is_alive;
2065
2066 // Check class_loader is alive for this bit of metadata.
2067 static void check_class(Metadata* md) {
2068 Klass* klass = NULL;
2069 if (md->is_klass()) {
2070 klass = ((Klass*)md);
2071 } else if (md->is_method()) {
2072 klass = ((Method*)md)->method_holder();
2073 } else if (md->is_methodData()) {
2074 klass = ((MethodData*)md)->method()->method_holder();
2075 } else {
2076 md->print();
2077 ShouldNotReachHere();
2078 }
2079 assert(klass->is_loader_alive(_is_alive), "must be alive");
2080 }
2081 public:
2082 static void do_check_class(BoolObjectClosure* is_alive, nmethod* nm) {
2083 assert(SafepointSynchronize::is_at_safepoint(), "this is only ok at safepoint");
2084 _is_alive = is_alive;
2085 nm->metadata_do(check_class);
2086 }
2087 };
2088
2089 // This is called during a safepoint so can use static data
2090 BoolObjectClosure* CheckClass::_is_alive = NULL;
2091 #endif // ASSERT
2092
2093
2094 // Processing of oop references should have been sufficient to keep
2095 // all strong references alive. Any weak references should have been
2096 // cleared as well. Visit all the metadata and ensure that it's
2097 // really alive.
2098 void nmethod::verify_metadata_loaders(address low_boundary, BoolObjectClosure* is_alive) {
2099 #ifdef ASSERT
2100 RelocIterator iter(this, low_boundary);
2101 while (iter.next()) {
2102 // static_stub_Relocations may have dangling references to
2103 // Method*s so trim them out here. Otherwise it looks like
2104 // compiled code is maintaining a link to dead metadata.
2105 address static_call_addr = NULL;
2106 if (iter.type() == relocInfo::opt_virtual_call_type) {
2107 CompiledIC* cic = CompiledIC_at(&iter);
2108 if (!cic->is_call_to_interpreted()) {
2109 static_call_addr = iter.addr();
2110 }
2111 } else if (iter.type() == relocInfo::static_call_type) {
2112 CompiledStaticCall* csc = compiledStaticCall_at(iter.reloc());
2113 if (!csc->is_call_to_interpreted()) {
2114 static_call_addr = iter.addr();
2115 }
2116 }
2117 if (static_call_addr != NULL) {
2118 RelocIterator sciter(this, low_boundary);
2119 while (sciter.next()) {
2120 if (sciter.type() == relocInfo::static_stub_type &&
2121 sciter.static_stub_reloc()->static_call() == static_call_addr) {
2122 sciter.static_stub_reloc()->clear_inline_cache();
2123 }
2124 }
2125 }
2126 }
2127 // Check that the metadata embedded in the nmethod is alive
2128 CheckClass::do_check_class(is_alive, this);
2129 #endif
2130 }
2131
2132
2133 // Iterate over metadata calling this function. Used by RedefineClasses
2134 void nmethod::metadata_do(void f(Metadata*)) {
2135 address low_boundary = verified_entry_point();
2136 if (is_not_entrant()) {
2137 low_boundary += NativeJump::instruction_size;
2138 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
2139 // (See comment above.)
2140 }
2141 {
2142 // Visit all immediate references that are embedded in the instruction stream.
2143 RelocIterator iter(this, low_boundary);
2144 while (iter.next()) {
2145 if (iter.type() == relocInfo::metadata_type ) {
2146 metadata_Relocation* r = iter.metadata_reloc();
2147 // In this metadata, we must only follow those metadatas directly embedded in
2148 // the code. Other metadatas (oop_index>0) are seen as part of
2149 // the metadata section below.
2150 assert(1 == (r->metadata_is_immediate()) +
2151 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
2152 "metadata must be found in exactly one place");
2153 if (r->metadata_is_immediate() && r->metadata_value() != NULL) {
2154 Metadata* md = r->metadata_value();
2155 f(md);
2156 }
2157 } else if (iter.type() == relocInfo::virtual_call_type) {
2158 // Check compiledIC holders associated with this nmethod
2159 CompiledIC *ic = CompiledIC_at(&iter);
2160 if (ic->is_icholder_call()) {
2161 CompiledICHolder* cichk = ic->cached_icholder();
2162 f(cichk->holder_method());
2163 f(cichk->holder_klass());
2164 } else {
2165 Metadata* ic_oop = ic->cached_metadata();
2166 if (ic_oop != NULL) {
2167 f(ic_oop);
2168 }
2169 }
2170 }
2171 }
2172 }
2173
2174 // Visit the metadata section
2175 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
2176 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops
2177 Metadata* md = *p;
2178 f(md);
2179 }
2180
2181 // Visit metadata not embedded in the other places.
2182 if (_method != NULL) f(_method);
2183 }
2184
2185 void nmethod::oops_do(OopClosure* f, bool allow_zombie) {
2186 // make sure the oops ready to receive visitors
2187 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod");
2188 assert(!is_unloaded(), "should not call follow on unloaded nmethod");
2189
2190 // If the method is not entrant or zombie then a JMP is plastered over the
2191 // first few bytes. If an oop in the old code was there, that oop
2192 // should not get GC'd. Skip the first few bytes of oops on
2193 // not-entrant methods.
2194 address low_boundary = verified_entry_point();
2195 if (is_not_entrant()) {
2196 low_boundary += NativeJump::instruction_size;
2197 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
2198 // (See comment above.)
2199 }
2200
2201 RelocIterator iter(this, low_boundary);
2202
2203 while (iter.next()) {
2204 if (iter.type() == relocInfo::oop_type ) {
2205 oop_Relocation* r = iter.oop_reloc();
2206 // In this loop, we must only follow those oops directly embedded in
2207 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
2208 assert(1 == (r->oop_is_immediate()) +
2209 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
2210 "oop must be found in exactly one place");
2211 if (r->oop_is_immediate() && r->oop_value() != NULL) {
2212 f->do_oop(r->oop_addr());
2213 }
2214 }
2215 }
2216
2217 // Scopes
2218 // This includes oop constants not inlined in the code stream.
2219 for (oop* p = oops_begin(); p < oops_end(); p++) {
2220 if (*p == Universe::non_oop_word()) continue; // skip non-oops
2221 f->do_oop(p);
2222 }
2223 }
2224
2225 #define NMETHOD_SENTINEL ((nmethod*)badAddress)
2226
2227 nmethod* volatile nmethod::_oops_do_mark_nmethods;
2228
2229 // An nmethod is "marked" if its _mark_link is set non-null.
2230 // Even if it is the end of the linked list, it will have a non-null link value,
2231 // as long as it is on the list.
2232 // This code must be MP safe, because it is used from parallel GC passes.
2233 bool nmethod::test_set_oops_do_mark() {
2234 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");
2235 nmethod* observed_mark_link = _oops_do_mark_link;
2236 if (observed_mark_link == NULL) {
2237 // Claim this nmethod for this thread to mark.
2238 observed_mark_link = (nmethod*)
2239 Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_link, NULL);
2240 if (observed_mark_link == NULL) {
2241
2242 // Atomically append this nmethod (now claimed) to the head of the list:
2243 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods;
2244 for (;;) {
2245 nmethod* required_mark_nmethods = observed_mark_nmethods;
2246 _oops_do_mark_link = required_mark_nmethods;
2247 observed_mark_nmethods = (nmethod*)
2248 Atomic::cmpxchg_ptr(this, &_oops_do_mark_nmethods, required_mark_nmethods);
2249 if (observed_mark_nmethods == required_mark_nmethods)
2250 break;
2251 }
2252 // Mark was clear when we first saw this guy.
2253 NOT_PRODUCT(if (TraceScavenge) print_on(tty, "oops_do, mark"));
2254 return false;
2255 }
2256 }
2257 // On fall through, another racing thread marked this nmethod before we did.
2258 return true;
2259 }
2260
2261 void nmethod::oops_do_marking_prologue() {
2262 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("[oops_do_marking_prologue"));
2263 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row");
2264 // We use cmpxchg_ptr instead of regular assignment here because the user
2265 // may fork a bunch of threads, and we need them all to see the same state.
2266 void* observed = Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, NULL);
2267 guarantee(observed == NULL, "no races in this sequential code");
2268 }
2269
2270 void nmethod::oops_do_marking_epilogue() {
2271 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row");
2272 nmethod* cur = _oops_do_mark_nmethods;
2273 while (cur != NMETHOD_SENTINEL) {
2274 assert(cur != NULL, "not NULL-terminated");
2275 nmethod* next = cur->_oops_do_mark_link;
2276 cur->_oops_do_mark_link = NULL;
2277 cur->verify_oop_relocations();
2278 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark"));
2279 cur = next;
2280 }
2281 void* required = _oops_do_mark_nmethods;
2282 void* observed = Atomic::cmpxchg_ptr(NULL, &_oops_do_mark_nmethods, required);
2283 guarantee(observed == required, "no races in this sequential code");
2284 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("oops_do_marking_epilogue]"));
2285 }
2286
2287 class DetectScavengeRoot: public OopClosure {
2288 bool _detected_scavenge_root;
2289 public:
2290 DetectScavengeRoot() : _detected_scavenge_root(false)
2291 { NOT_PRODUCT(_print_nm = NULL); }
2292 bool detected_scavenge_root() { return _detected_scavenge_root; }
2293 virtual void do_oop(oop* p) {
2294 if ((*p) != NULL && (*p)->is_scavengable()) {
2295 NOT_PRODUCT(maybe_print(p));
2296 _detected_scavenge_root = true;
2297 }
2298 }
2299 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2300
2301 #ifndef PRODUCT
2302 nmethod* _print_nm;
2303 void maybe_print(oop* p) {
2304 if (_print_nm == NULL) return;
2305 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root");
2306 tty->print_cr(""PTR_FORMAT"[offset=%d] detected scavengable oop "PTR_FORMAT" (found at "PTR_FORMAT")",
2307 _print_nm, (int)((intptr_t)p - (intptr_t)_print_nm),
2308 (void *)(*p), (intptr_t)p);
2309 (*p)->print();
2310 }
2311 #endif //PRODUCT
2312 };
2313
2314 bool nmethod::detect_scavenge_root_oops() {
2315 DetectScavengeRoot detect_scavenge_root;
2316 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this);
2317 oops_do(&detect_scavenge_root);
2318 return detect_scavenge_root.detected_scavenge_root();
2319 }
2320
2321 // Method that knows how to preserve outgoing arguments at call. This method must be
2322 // called with a frame corresponding to a Java invoke
2323 void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) {
2324 #ifndef SHARK
2325 if (!method()->is_native()) {
2326 SimpleScopeDesc ssd(this, fr.pc());
2327 Bytecode_invoke call(ssd.method(), ssd.bci());
2328 bool has_receiver = call.has_receiver();
2329 bool has_appendix = call.has_appendix();
2330 Symbol* signature = call.signature();
2331 fr.oops_compiled_arguments_do(signature, has_receiver, has_appendix, reg_map, f);
2332 }
2333 #endif // !SHARK
2334 }
2335
2336
2337 oop nmethod::embeddedOop_at(u_char* p) {
2338 RelocIterator iter(this, p, p + 1);
2339 while (iter.next())
2340 if (iter.type() == relocInfo::oop_type) {
2341 return iter.oop_reloc()->oop_value();
2342 }
2343 return NULL;
2344 }
2345
2346
2347 inline bool includes(void* p, void* from, void* to) {
2348 return from <= p && p < to;
2349 }
2350
2351
2352 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
2353 assert(count >= 2, "must be sentinel values, at least");
2354
2355 #ifdef ASSERT
2356 // must be sorted and unique; we do a binary search in find_pc_desc()
2357 int prev_offset = pcs[0].pc_offset();
2358 assert(prev_offset == PcDesc::lower_offset_limit,
2359 "must start with a sentinel");
2360 for (int i = 1; i < count; i++) {
2361 int this_offset = pcs[i].pc_offset();
2362 assert(this_offset > prev_offset, "offsets must be sorted");
2363 prev_offset = this_offset;
2364 }
2365 assert(prev_offset == PcDesc::upper_offset_limit,
2366 "must end with a sentinel");
2367 #endif //ASSERT
2368
2369 // Search for MethodHandle invokes and tag the nmethod.
2370 for (int i = 0; i < count; i++) {
2371 if (pcs[i].is_method_handle_invoke()) {
2372 set_has_method_handle_invokes(true);
2373 break;
2374 }
2375 }
2376 assert(has_method_handle_invokes() == (_deoptimize_mh_offset != -1), "must have deopt mh handler");
2377
2378 int size = count * sizeof(PcDesc);
2379 assert(scopes_pcs_size() >= size, "oob");
2380 memcpy(scopes_pcs_begin(), pcs, size);
2381
2382 // Adjust the final sentinel downward.
2383 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
2384 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
2385 last_pc->set_pc_offset(content_size() + 1);
2386 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
2387 // Fill any rounding gaps with copies of the last record.
2388 last_pc[1] = last_pc[0];
2389 }
2390 // The following assert could fail if sizeof(PcDesc) is not
2391 // an integral multiple of oopSize (the rounding term).
2392 // If it fails, change the logic to always allocate a multiple
2393 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
2394 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
2395 }
2396
2397 void nmethod::copy_scopes_data(u_char* buffer, int size) {
2398 assert(scopes_data_size() >= size, "oob");
2399 memcpy(scopes_data_begin(), buffer, size);
2400 }
2401
2402
2403 #ifdef ASSERT
2404 static PcDesc* linear_search(nmethod* nm, int pc_offset, bool approximate) {
2405 PcDesc* lower = nm->scopes_pcs_begin();
2406 PcDesc* upper = nm->scopes_pcs_end();
2407 lower += 1; // exclude initial sentinel
2408 PcDesc* res = NULL;
2409 for (PcDesc* p = lower; p < upper; p++) {
2410 NOT_PRODUCT(--nmethod_stats.pc_desc_tests); // don't count this call to match_desc
2411 if (match_desc(p, pc_offset, approximate)) {
2412 if (res == NULL)
2413 res = p;
2414 else
2415 res = (PcDesc*) badAddress;
2416 }
2417 }
2418 return res;
2419 }
2420 #endif
2421
2422
2423 // Finds a PcDesc with real-pc equal to "pc"
2424 PcDesc* nmethod::find_pc_desc_internal(address pc, bool approximate) {
2425 address base_address = code_begin();
2426 if ((pc < base_address) ||
2427 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
2428 return NULL; // PC is wildly out of range
2429 }
2430 int pc_offset = (int) (pc - base_address);
2431
2432 // Check the PcDesc cache if it contains the desired PcDesc
2433 // (This as an almost 100% hit rate.)
2434 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
2435 if (res != NULL) {
2436 assert(res == linear_search(this, pc_offset, approximate), "cache ok");
2437 return res;
2438 }
2439
2440 // Fallback algorithm: quasi-linear search for the PcDesc
2441 // Find the last pc_offset less than the given offset.
2442 // The successor must be the required match, if there is a match at all.
2443 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
2444 PcDesc* lower = scopes_pcs_begin();
2445 PcDesc* upper = scopes_pcs_end();
2446 upper -= 1; // exclude final sentinel
2447 if (lower >= upper) return NULL; // native method; no PcDescs at all
2448
2449 #define assert_LU_OK \
2450 /* invariant on lower..upper during the following search: */ \
2451 assert(lower->pc_offset() < pc_offset, "sanity"); \
2452 assert(upper->pc_offset() >= pc_offset, "sanity")
2453 assert_LU_OK;
2454
2455 // Use the last successful return as a split point.
2456 PcDesc* mid = _pc_desc_cache.last_pc_desc();
2457 NOT_PRODUCT(++nmethod_stats.pc_desc_searches);
2458 if (mid->pc_offset() < pc_offset) {
2459 lower = mid;
2460 } else {
2461 upper = mid;
2462 }
2463
2464 // Take giant steps at first (4096, then 256, then 16, then 1)
2465 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
2466 const int RADIX = (1 << LOG2_RADIX);
2467 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
2468 while ((mid = lower + step) < upper) {
2469 assert_LU_OK;
2470 NOT_PRODUCT(++nmethod_stats.pc_desc_searches);
2471 if (mid->pc_offset() < pc_offset) {
2472 lower = mid;
2473 } else {
2474 upper = mid;
2475 break;
2476 }
2477 }
2478 assert_LU_OK;
2479 }
2480
2481 // Sneak up on the value with a linear search of length ~16.
2482 while (true) {
2483 assert_LU_OK;
2484 mid = lower + 1;
2485 NOT_PRODUCT(++nmethod_stats.pc_desc_searches);
2486 if (mid->pc_offset() < pc_offset) {
2487 lower = mid;
2488 } else {
2489 upper = mid;
2490 break;
2491 }
2492 }
2493 #undef assert_LU_OK
2494
2495 if (match_desc(upper, pc_offset, approximate)) {
2496 assert(upper == linear_search(this, pc_offset, approximate), "search ok");
2497 _pc_desc_cache.add_pc_desc(upper);
2498 return upper;
2499 } else {
2500 assert(NULL == linear_search(this, pc_offset, approximate), "search ok");
2501 return NULL;
2502 }
2503 }
2504
2505
2506 bool nmethod::check_all_dependencies() {
2507 bool found_check = false;
2508 // wholesale check of all dependencies
2509 for (Dependencies::DepStream deps(this); deps.next(); ) {
2510 if (deps.check_dependency() != NULL) {
2511 found_check = true;
2512 NOT_DEBUG(break);
2513 }
2514 }
2515 return found_check; // tell caller if we found anything
2516 }
2517
2518 bool nmethod::check_dependency_on(DepChange& changes) {
2519 // What has happened:
2520 // 1) a new class dependee has been added
2521 // 2) dependee and all its super classes have been marked
2522 bool found_check = false; // set true if we are upset
2523 for (Dependencies::DepStream deps(this); deps.next(); ) {
2524 // Evaluate only relevant dependencies.
2525 if (deps.spot_check_dependency_at(changes) != NULL) {
2526 found_check = true;
2527 NOT_DEBUG(break);
2528 }
2529 }
2530 return found_check;
2531 }
2532
2533 bool nmethod::is_evol_dependent_on(Klass* dependee) {
2534 InstanceKlass *dependee_ik = InstanceKlass::cast(dependee);
2535 Array<Method*>* dependee_methods = dependee_ik->methods();
2536 for (Dependencies::DepStream deps(this); deps.next(); ) {
2537 if (deps.type() == Dependencies::evol_method) {
2538 Method* method = deps.method_argument(0);
2539 for (int j = 0; j < dependee_methods->length(); j++) {
2540 if (dependee_methods->at(j) == method) {
2541 // RC_TRACE macro has an embedded ResourceMark
2542 RC_TRACE(0x01000000,
2543 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)",
2544 _method->method_holder()->external_name(),
2545 _method->name()->as_C_string(),
2546 _method->signature()->as_C_string(), compile_id(),
2547 method->method_holder()->external_name(),
2548 method->name()->as_C_string(),
2549 method->signature()->as_C_string()));
2550 if (TraceDependencies || LogCompilation)
2551 deps.log_dependency(dependee);
2552 return true;
2553 }
2554 }
2555 }
2556 }
2557 return false;
2558 }
2559
2560 // Called from mark_for_deoptimization, when dependee is invalidated.
2561 bool nmethod::is_dependent_on_method(Method* dependee) {
2562 for (Dependencies::DepStream deps(this); deps.next(); ) {
2563 if (deps.type() != Dependencies::evol_method)
2564 continue;
2565 Method* method = deps.method_argument(0);
2566 if (method == dependee) return true;
2567 }
2568 return false;
2569 }
2570
2571
2572 bool nmethod::is_patchable_at(address instr_addr) {
2573 assert(insts_contains(instr_addr), "wrong nmethod used");
2574 if (is_zombie()) {
2575 // a zombie may never be patched
2576 return false;
2577 }
2578 return true;
2579 }
2580
2581
2582 address nmethod::continuation_for_implicit_exception(address pc) {
2583 // Exception happened outside inline-cache check code => we are inside
2584 // an active nmethod => use cpc to determine a return address
2585 int exception_offset = pc - code_begin();
2586 int cont_offset = ImplicitExceptionTable(this).at( exception_offset );
2587 #ifdef ASSERT
2588 if (cont_offset == 0) {
2589 Thread* thread = ThreadLocalStorage::get_thread_slow();
2590 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
2591 HandleMark hm(thread);
2592 ResourceMark rm(thread);
2593 CodeBlob* cb = CodeCache::find_blob(pc);
2594 assert(cb != NULL && cb == this, "");
2595 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, pc);
2596 print();
2597 method()->print_codes();
2598 print_code();
2599 print_pcs();
2600 }
2601 #endif
2602 if (cont_offset == 0) {
2603 // Let the normal error handling report the exception
2604 return NULL;
2605 }
2606 return code_begin() + cont_offset;
2607 }
2608
2609
2610
2611 void nmethod_init() {
2612 // make sure you didn't forget to adjust the filler fields
2613 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
2614 }
2615
2616
2617 //-------------------------------------------------------------------------------------------
2618
2619
2620 // QQQ might we make this work from a frame??
2621 nmethodLocker::nmethodLocker(address pc) {
2622 CodeBlob* cb = CodeCache::find_blob(pc);
2623 guarantee(cb != NULL && cb->is_nmethod(), "bad pc for a nmethod found");
2624 _nm = (nmethod*)cb;
2625 lock_nmethod(_nm);
2626 }
2627
2628 // Only JvmtiDeferredEvent::compiled_method_unload_event()
2629 // should pass zombie_ok == true.
2630 void nmethodLocker::lock_nmethod(nmethod* nm, bool zombie_ok) {
2631 if (nm == NULL) return;
2632 Atomic::inc(&nm->_lock_count);
2633 guarantee(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method");
2634 }
2635
2636 void nmethodLocker::unlock_nmethod(nmethod* nm) {
2637 if (nm == NULL) return;
2638 Atomic::dec(&nm->_lock_count);
2639 guarantee(nm->_lock_count >= 0, "unmatched nmethod lock/unlock");
2640 }
2641
2642
2643 // -----------------------------------------------------------------------------
2644 // nmethod::get_deopt_original_pc
2645 //
2646 // Return the original PC for the given PC if:
2647 // (a) the given PC belongs to a nmethod and
2648 // (b) it is a deopt PC
2649 address nmethod::get_deopt_original_pc(const frame* fr) {
2650 if (fr->cb() == NULL) return NULL;
2651
2652 nmethod* nm = fr->cb()->as_nmethod_or_null();
2653 if (nm != NULL && nm->is_deopt_pc(fr->pc()))
2654 return nm->get_original_pc(fr);
2655
2656 return NULL;
2657 }
2658
2659
2660 // -----------------------------------------------------------------------------
2661 // MethodHandle
2662
2663 bool nmethod::is_method_handle_return(address return_pc) {
2664 if (!has_method_handle_invokes()) return false;
2665 PcDesc* pd = pc_desc_at(return_pc);
2666 if (pd == NULL)
2667 return false;
2668 return pd->is_method_handle_invoke();
2669 }
2670
2671
2672 // -----------------------------------------------------------------------------
2673 // Verification
2674
2675 class VerifyOopsClosure: public OopClosure {
2676 nmethod* _nm;
2677 bool _ok;
2678 public:
2679 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
2680 bool ok() { return _ok; }
2681 virtual void do_oop(oop* p) {
2682 if ((*p) == NULL || (*p)->is_oop()) return;
2683 if (_ok) {
2684 _nm->print_nmethod(true);
2685 _ok = false;
2686 }
2687 tty->print_cr("*** non-oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)",
2688 (void *)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm));
2689 }
2690 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2691 };
2692
2693 void nmethod::verify() {
2694
2695 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant
2696 // seems odd.
2697
2698 if( is_zombie() || is_not_entrant() )
2699 return;
2700
2701 // Make sure all the entry points are correctly aligned for patching.
2702 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
2703
2704 // assert(method()->is_oop(), "must be valid");
2705
2706 ResourceMark rm;
2707
2708 if (!CodeCache::contains(this)) {
2709 fatal(err_msg("nmethod at " INTPTR_FORMAT " not in zone", this));
2710 }
2711
2712 if(is_native_method() )
2713 return;
2714
2715 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
2716 if (nm != this) {
2717 fatal(err_msg("findNMethod did not find this nmethod (" INTPTR_FORMAT ")",
2718 this));
2719 }
2720
2721 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2722 if (! p->verify(this)) {
2723 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", this);
2724 }
2725 }
2726
2727 VerifyOopsClosure voc(this);
2728 oops_do(&voc);
2729 assert(voc.ok(), "embedded oops must be OK");
2730 verify_scavenge_root_oops();
2731
2732 verify_scopes();
2733 }
2734
2735
2736 void nmethod::verify_interrupt_point(address call_site) {
2737 // Verify IC only when nmethod installation is finished.
2738 bool is_installed = (method()->code() == this) // nmethod is in state 'in_use' and installed
2739 || !this->is_in_use(); // nmethod is installed, but not in 'in_use' state
2740 if (is_installed) {
2741 Thread *cur = Thread::current();
2742 if (CompiledIC_lock->owner() == cur ||
2743 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) &&
2744 SafepointSynchronize::is_at_safepoint())) {
2745 CompiledIC_at(this, call_site);
2746 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
2747 } else {
2748 MutexLocker ml_verify (CompiledIC_lock);
2749 CompiledIC_at(this, call_site);
2750 }
2751 }
2752
2753 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address());
2754 assert(pd != NULL, "PcDesc must exist");
2755 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(),
2756 pd->obj_decode_offset(), pd->should_reexecute(),
2757 pd->return_oop());
2758 !sd->is_top(); sd = sd->sender()) {
2759 sd->verify();
2760 }
2761 }
2762
2763 void nmethod::verify_scopes() {
2764 if( !method() ) return; // Runtime stubs have no scope
2765 if (method()->is_native()) return; // Ignore stub methods.
2766 // iterate through all interrupt point
2767 // and verify the debug information is valid.
2768 RelocIterator iter((nmethod*)this);
2769 while (iter.next()) {
2770 address stub = NULL;
2771 switch (iter.type()) {
2772 case relocInfo::virtual_call_type:
2773 verify_interrupt_point(iter.addr());
2774 break;
2775 case relocInfo::opt_virtual_call_type:
2776 stub = iter.opt_virtual_call_reloc()->static_stub();
2777 verify_interrupt_point(iter.addr());
2778 break;
2779 case relocInfo::static_call_type:
2780 stub = iter.static_call_reloc()->static_stub();
2781 //verify_interrupt_point(iter.addr());
2782 break;
2783 case relocInfo::runtime_call_type:
2784 address destination = iter.reloc()->value();
2785 // Right now there is no way to find out which entries support
2786 // an interrupt point. It would be nice if we had this
2787 // information in a table.
2788 break;
2789 }
2790 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section");
2791 }
2792 }
2793
2794
2795 // -----------------------------------------------------------------------------
2796 // Non-product code
2797 #ifndef PRODUCT
2798
2799 class DebugScavengeRoot: public OopClosure {
2800 nmethod* _nm;
2801 bool _ok;
2802 public:
2803 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { }
2804 bool ok() { return _ok; }
2805 virtual void do_oop(oop* p) {
2806 if ((*p) == NULL || !(*p)->is_scavengable()) return;
2807 if (_ok) {
2808 _nm->print_nmethod(true);
2809 _ok = false;
2810 }
2811 tty->print_cr("*** scavengable oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)",
2812 (void *)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm));
2813 (*p)->print();
2814 }
2815 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2816 };
2817
2818 void nmethod::verify_scavenge_root_oops() {
2819 if (UseG1GC) {
2820 return;
2821 }
2822
2823 if (!on_scavenge_root_list()) {
2824 // Actually look inside, to verify the claim that it's clean.
2825 DebugScavengeRoot debug_scavenge_root(this);
2826 oops_do(&debug_scavenge_root);
2827 if (!debug_scavenge_root.ok())
2828 fatal("found an unadvertised bad scavengable oop in the code cache");
2829 }
2830 assert(scavenge_root_not_marked(), "");
2831 }
2832
2833 #endif // PRODUCT
2834
2835 // Printing operations
2836
2837 void nmethod::print() const {
2838 ResourceMark rm;
2839 ttyLocker ttyl; // keep the following output all in one block
2840
2841 tty->print("Compiled method ");
2842
2843 if (is_compiled_by_c1()) {
2844 tty->print("(c1) ");
2845 } else if (is_compiled_by_c2()) {
2846 tty->print("(c2) ");
2847 } else if (is_compiled_by_shark()) {
2848 tty->print("(shark) ");
2849 } else {
2850 tty->print("(nm) ");
2851 }
2852
2853 print_on(tty, NULL);
2854
2855 if (WizardMode) {
2856 tty->print("((nmethod*) "INTPTR_FORMAT ") ", this);
2857 tty->print(" for method " INTPTR_FORMAT , (address)method());
2858 tty->print(" { ");
2859 if (is_in_use()) tty->print("in_use ");
2860 if (is_not_entrant()) tty->print("not_entrant ");
2861 if (is_zombie()) tty->print("zombie ");
2862 if (is_unloaded()) tty->print("unloaded ");
2863 if (on_scavenge_root_list()) tty->print("scavenge_root ");
2864 tty->print_cr("}:");
2865 }
2866 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2867 (address)this,
2868 (address)this + size(),
2869 size());
2870 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2871 relocation_begin(),
2872 relocation_end(),
2873 relocation_size());
2874 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2875 consts_begin(),
2876 consts_end(),
2877 consts_size());
2878 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2879 insts_begin(),
2880 insts_end(),
2881 insts_size());
2882 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2883 stub_begin(),
2884 stub_end(),
2885 stub_size());
2886 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2887 oops_begin(),
2888 oops_end(),
2889 oops_size());
2890 if (metadata_size () > 0) tty->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2891 metadata_begin(),
2892 metadata_end(),
2893 metadata_size());
2894 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2895 scopes_data_begin(),
2896 scopes_data_end(),
2897 scopes_data_size());
2898 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2899 scopes_pcs_begin(),
2900 scopes_pcs_end(),
2901 scopes_pcs_size());
2902 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2903 dependencies_begin(),
2904 dependencies_end(),
2905 dependencies_size());
2906 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2907 handler_table_begin(),
2908 handler_table_end(),
2909 handler_table_size());
2910 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2911 nul_chk_table_begin(),
2912 nul_chk_table_end(),
2913 nul_chk_table_size());
2914 }
2915
2916 void nmethod::print_code() {
2917 HandleMark hm;
2918 ResourceMark m;
2919 Disassembler::decode(this);
2920 }
2921
2922
2923 #ifndef PRODUCT
2924
2925 void nmethod::print_scopes() {
2926 // Find the first pc desc for all scopes in the code and print it.
2927 ResourceMark rm;
2928 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2929 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
2930 continue;
2931
2932 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
2933 sd->print_on(tty, p);
2934 }
2935 }
2936
2937 void nmethod::print_dependencies() {
2938 ResourceMark rm;
2939 ttyLocker ttyl; // keep the following output all in one block
2940 tty->print_cr("Dependencies:");
2941 for (Dependencies::DepStream deps(this); deps.next(); ) {
2942 deps.print_dependency();
2943 Klass* ctxk = deps.context_type();
2944 if (ctxk != NULL) {
2945 if (ctxk->oop_is_instance() && ((InstanceKlass*)ctxk)->is_dependent_nmethod(this)) {
2946 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name());
2947 }
2948 }
2949 deps.log_dependency(); // put it into the xml log also
2950 }
2951 }
2952
2953
2954 void nmethod::print_relocations() {
2955 ResourceMark m; // in case methods get printed via the debugger
2956 tty->print_cr("relocations:");
2957 RelocIterator iter(this);
2958 iter.print();
2959 if (UseRelocIndex) {
2960 jint* index_end = (jint*)relocation_end() - 1;
2961 jint index_size = *index_end;
2962 jint* index_start = (jint*)( (address)index_end - index_size );
2963 tty->print_cr(" index @" INTPTR_FORMAT ": index_size=%d", index_start, index_size);
2964 if (index_size > 0) {
2965 jint* ip;
2966 for (ip = index_start; ip+2 <= index_end; ip += 2)
2967 tty->print_cr(" (%d %d) addr=" INTPTR_FORMAT " @" INTPTR_FORMAT,
2968 ip[0],
2969 ip[1],
2970 header_end()+ip[0],
2971 relocation_begin()-1+ip[1]);
2972 for (; ip < index_end; ip++)
2973 tty->print_cr(" (%d ?)", ip[0]);
2974 tty->print_cr(" @" INTPTR_FORMAT ": index_size=%d", ip, *ip);
2975 ip++;
2976 tty->print_cr("reloc_end @" INTPTR_FORMAT ":", ip);
2977 }
2978 }
2979 }
2980
2981
2982 void nmethod::print_pcs() {
2983 ResourceMark m; // in case methods get printed via debugger
2984 tty->print_cr("pc-bytecode offsets:");
2985 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2986 p->print(this);
2987 }
2988 }
2989
2990 #endif // PRODUCT
2991
2992 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
2993 RelocIterator iter(this, begin, end);
2994 bool have_one = false;
2995 while (iter.next()) {
2996 have_one = true;
2997 switch (iter.type()) {
2998 case relocInfo::none: return "no_reloc";
2999 case relocInfo::oop_type: {
3000 stringStream st;
3001 oop_Relocation* r = iter.oop_reloc();
3002 oop obj = r->oop_value();
3003 st.print("oop(");
3004 if (obj == NULL) st.print("NULL");
3005 else obj->print_value_on(&st);
3006 st.print(")");
3007 return st.as_string();
3008 }
3009 case relocInfo::metadata_type: {
3010 stringStream st;
3011 metadata_Relocation* r = iter.metadata_reloc();
3012 Metadata* obj = r->metadata_value();
3013 st.print("metadata(");
3014 if (obj == NULL) st.print("NULL");
3015 else obj->print_value_on(&st);
3016 st.print(")");
3017 return st.as_string();
3018 }
3019 case relocInfo::virtual_call_type: return "virtual_call";
3020 case relocInfo::opt_virtual_call_type: return "optimized virtual_call";
3021 case relocInfo::static_call_type: return "static_call";
3022 case relocInfo::static_stub_type: return "static_stub";
3023 case relocInfo::runtime_call_type: return "runtime_call";
3024 case relocInfo::external_word_type: return "external_word";
3025 case relocInfo::internal_word_type: return "internal_word";
3026 case relocInfo::section_word_type: return "section_word";
3027 case relocInfo::poll_type: return "poll";
3028 case relocInfo::poll_return_type: return "poll_return";
3029 case relocInfo::type_mask: return "type_bit_mask";
3030 }
3031 }
3032 return have_one ? "other" : NULL;
3033 }
3034
3035 // Return a the last scope in (begin..end]
3036 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
3037 PcDesc* p = pc_desc_near(begin+1);
3038 if (p != NULL && p->real_pc(this) <= end) {
3039 return new ScopeDesc(this, p->scope_decode_offset(),
3040 p->obj_decode_offset(), p->should_reexecute(),
3041 p->return_oop());
3042 }
3043 return NULL;
3044 }
3045
3046 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const {
3047 if (block_begin == entry_point()) stream->print_cr("[Entry Point]");
3048 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]");
3049 if (block_begin == exception_begin()) stream->print_cr("[Exception Handler]");
3050 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]");
3051 if (block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]");
3052
3053 if (has_method_handle_invokes())
3054 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]");
3055
3056 if (block_begin == consts_begin()) stream->print_cr("[Constants]");
3057
3058 if (block_begin == entry_point()) {
3059 methodHandle m = method();
3060 if (m.not_null()) {
3061 stream->print(" # ");
3062 m->print_value_on(stream);
3063 stream->cr();
3064 }
3065 if (m.not_null() && !is_osr_method()) {
3066 ResourceMark rm;
3067 int sizeargs = m->size_of_parameters();
3068 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
3069 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
3070 {
3071 int sig_index = 0;
3072 if (!m->is_static())
3073 sig_bt[sig_index++] = T_OBJECT; // 'this'
3074 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) {
3075 BasicType t = ss.type();
3076 sig_bt[sig_index++] = t;
3077 if (type2size[t] == 2) {
3078 sig_bt[sig_index++] = T_VOID;
3079 } else {
3080 assert(type2size[t] == 1, "size is 1 or 2");
3081 }
3082 }
3083 assert(sig_index == sizeargs, "");
3084 }
3085 const char* spname = "sp"; // make arch-specific?
3086 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false);
3087 int stack_slot_offset = this->frame_size() * wordSize;
3088 int tab1 = 14, tab2 = 24;
3089 int sig_index = 0;
3090 int arg_index = (m->is_static() ? 0 : -1);
3091 bool did_old_sp = false;
3092 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) {
3093 bool at_this = (arg_index == -1);
3094 bool at_old_sp = false;
3095 BasicType t = (at_this ? T_OBJECT : ss.type());
3096 assert(t == sig_bt[sig_index], "sigs in sync");
3097 if (at_this)
3098 stream->print(" # this: ");
3099 else
3100 stream->print(" # parm%d: ", arg_index);
3101 stream->move_to(tab1);
3102 VMReg fst = regs[sig_index].first();
3103 VMReg snd = regs[sig_index].second();
3104 if (fst->is_reg()) {
3105 stream->print("%s", fst->name());
3106 if (snd->is_valid()) {
3107 stream->print(":%s", snd->name());
3108 }
3109 } else if (fst->is_stack()) {
3110 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
3111 if (offset == stack_slot_offset) at_old_sp = true;
3112 stream->print("[%s+0x%x]", spname, offset);
3113 } else {
3114 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
3115 }
3116 stream->print(" ");
3117 stream->move_to(tab2);
3118 stream->print("= ");
3119 if (at_this) {
3120 m->method_holder()->print_value_on(stream);
3121 } else {
3122 bool did_name = false;
3123 if (!at_this && ss.is_object()) {
3124 Symbol* name = ss.as_symbol_or_null();
3125 if (name != NULL) {
3126 name->print_value_on(stream);
3127 did_name = true;
3128 }
3129 }
3130 if (!did_name)
3131 stream->print("%s", type2name(t));
3132 }
3133 if (at_old_sp) {
3134 stream->print(" (%s of caller)", spname);
3135 did_old_sp = true;
3136 }
3137 stream->cr();
3138 sig_index += type2size[t];
3139 arg_index += 1;
3140 if (!at_this) ss.next();
3141 }
3142 if (!did_old_sp) {
3143 stream->print(" # ");
3144 stream->move_to(tab1);
3145 stream->print("[%s+0x%x]", spname, stack_slot_offset);
3146 stream->print(" (%s of caller)", spname);
3147 stream->cr();
3148 }
3149 }
3150 }
3151 }
3152
3153 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) {
3154 // First, find an oopmap in (begin, end].
3155 // We use the odd half-closed interval so that oop maps and scope descs
3156 // which are tied to the byte after a call are printed with the call itself.
3157 address base = code_begin();
3158 OopMapSet* oms = oop_maps();
3159 if (oms != NULL) {
3160 for (int i = 0, imax = oms->size(); i < imax; i++) {
3161 OopMap* om = oms->at(i);
3162 address pc = base + om->offset();
3163 if (pc > begin) {
3164 if (pc <= end) {
3165 st->move_to(column);
3166 st->print("; ");
3167 om->print_on(st);
3168 }
3169 break;
3170 }
3171 }
3172 }
3173
3174 // Print any debug info present at this pc.
3175 ScopeDesc* sd = scope_desc_in(begin, end);
3176 if (sd != NULL) {
3177 st->move_to(column);
3178 if (sd->bci() == SynchronizationEntryBCI) {
3179 st->print(";*synchronization entry");
3180 } else {
3181 if (sd->method() == NULL) {
3182 st->print("method is NULL");
3183 } else if (sd->method()->is_native()) {
3184 st->print("method is native");
3185 } else {
3186 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci());
3187 st->print(";*%s", Bytecodes::name(bc));
3188 switch (bc) {
3189 case Bytecodes::_invokevirtual:
3190 case Bytecodes::_invokespecial:
3191 case Bytecodes::_invokestatic:
3192 case Bytecodes::_invokeinterface:
3193 {
3194 Bytecode_invoke invoke(sd->method(), sd->bci());
3195 st->print(" ");
3196 if (invoke.name() != NULL)
3197 invoke.name()->print_symbol_on(st);
3198 else
3199 st->print("<UNKNOWN>");
3200 break;
3201 }
3202 case Bytecodes::_getfield:
3203 case Bytecodes::_putfield:
3204 case Bytecodes::_getstatic:
3205 case Bytecodes::_putstatic:
3206 {
3207 Bytecode_field field(sd->method(), sd->bci());
3208 st->print(" ");
3209 if (field.name() != NULL)
3210 field.name()->print_symbol_on(st);
3211 else
3212 st->print("<UNKNOWN>");
3213 }
3214 }
3215 }
3216 }
3217
3218 // Print all scopes
3219 for (;sd != NULL; sd = sd->sender()) {
3220 st->move_to(column);
3221 st->print("; -");
3222 if (sd->method() == NULL) {
3223 st->print("method is NULL");
3224 } else {
3225 sd->method()->print_short_name(st);
3226 }
3227 int lineno = sd->method()->line_number_from_bci(sd->bci());
3228 if (lineno != -1) {
3229 st->print("@%d (line %d)", sd->bci(), lineno);
3230 } else {
3231 st->print("@%d", sd->bci());
3232 }
3233 st->cr();
3234 }
3235 }
3236
3237 // Print relocation information
3238 const char* str = reloc_string_for(begin, end);
3239 if (str != NULL) {
3240 if (sd != NULL) st->cr();
3241 st->move_to(column);
3242 st->print("; {%s}", str);
3243 }
3244 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin());
3245 if (cont_offset != 0) {
3246 st->move_to(column);
3247 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, code_begin() + cont_offset);
3248 }
3249
3250 }
3251
3252 #ifndef PRODUCT
3253
3254 void nmethod::print_value_on(outputStream* st) const {
3255 st->print("nmethod");
3256 print_on(st, NULL);
3257 }
3258
3259 void nmethod::print_calls(outputStream* st) {
3260 RelocIterator iter(this);
3261 while (iter.next()) {
3262 switch (iter.type()) {
3263 case relocInfo::virtual_call_type:
3264 case relocInfo::opt_virtual_call_type: {
3265 VerifyMutexLocker mc(CompiledIC_lock);
3266 CompiledIC_at(&iter)->print();
3267 break;
3268 }
3269 case relocInfo::static_call_type:
3270 st->print_cr("Static call at " INTPTR_FORMAT, iter.reloc()->addr());
3271 compiledStaticCall_at(iter.reloc())->print();
3272 break;
3273 }
3274 }
3275 }
3276
3277 void nmethod::print_handler_table() {
3278 ExceptionHandlerTable(this).print();
3279 }
3280
3281 void nmethod::print_nul_chk_table() {
3282 ImplicitExceptionTable(this).print(code_begin());
3283 }
3284
3285 void nmethod::print_statistics() {
3286 ttyLocker ttyl;
3287 if (xtty != NULL) xtty->head("statistics type='nmethod'");
3288 nmethod_stats.print_native_nmethod_stats();
3289 nmethod_stats.print_nmethod_stats();
3290 DebugInformationRecorder::print_statistics();
3291 nmethod_stats.print_pc_stats();
3292 Dependencies::print_statistics();
3293 if (xtty != NULL) xtty->tail("statistics");
3294 }
3295
3296 #endif // PRODUCT