1 /*
2 * Copyright (c) 1997, 2011, 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/methodDataOop.hpp"
38 #include "prims/jvmtiRedefineClassesTrace.hpp"
39 #include "prims/jvmtiImpl.hpp"
40 #include "runtime/sharedRuntime.hpp"
41 #include "runtime/sweeper.hpp"
42 #include "utilities/dtrace.hpp"
43 #include "utilities/events.hpp"
44 #include "utilities/xmlstream.hpp"
45 #ifdef SHARK
46 #include "shark/sharkCompiler.hpp"
47 #endif
48
49 #ifdef DTRACE_ENABLED
50
51 // Only bother with this argument setup if dtrace is available
52
53 #ifndef USDT2
54 HS_DTRACE_PROBE_DECL8(hotspot, compiled__method__load,
55 const char*, int, const char*, int, const char*, int, void*, size_t);
56
57 HS_DTRACE_PROBE_DECL6(hotspot, compiled__method__unload,
58 char*, int, char*, int, char*, int);
59
60 #define DTRACE_METHOD_UNLOAD_PROBE(method) \
61 { \
62 methodOop m = (method); \
63 if (m != NULL) { \
64 Symbol* klass_name = m->klass_name(); \
65 Symbol* name = m->name(); \
66 Symbol* signature = m->signature(); \
67 HS_DTRACE_PROBE6(hotspot, compiled__method__unload, \
68 klass_name->bytes(), klass_name->utf8_length(), \
69 name->bytes(), name->utf8_length(), \
70 signature->bytes(), signature->utf8_length()); \
71 } \
72 }
73 #else /* USDT2 */
74 #define DTRACE_METHOD_UNLOAD_PROBE(method) \
75 { \
76 methodOop m = (method); \
77 if (m != NULL) { \
78 Symbol* klass_name = m->klass_name(); \
79 Symbol* name = m->name(); \
80 Symbol* signature = m->signature(); \
81 HOTSPOT_COMPILED_METHOD_UNLOAD( \
82 (char *) klass_name->bytes(), klass_name->utf8_length(), \
83 (char *) name->bytes(), name->utf8_length(), \
84 (char *) signature->bytes(), signature->utf8_length()); \
85 } \
86 }
87 #endif /* USDT2 */
88
89 #else // ndef DTRACE_ENABLED
90
91 #define DTRACE_METHOD_UNLOAD_PROBE(method)
92
93 #endif
94
95 bool nmethod::is_compiled_by_c1() const {
96 if (compiler() == NULL || method() == NULL) return false; // can happen during debug printing
97 if (is_native_method()) return false;
98 return compiler()->is_c1();
99 }
100 bool nmethod::is_compiled_by_c2() const {
101 if (compiler() == NULL || method() == NULL) return false; // can happen during debug printing
102 if (is_native_method()) return false;
103 return compiler()->is_c2();
104 }
105 bool nmethod::is_compiled_by_shark() const {
106 if (is_native_method()) return false;
107 assert(compiler() != NULL, "must be");
108 return compiler()->is_shark();
109 }
110
111
112
113 //---------------------------------------------------------------------------------
114 // NMethod statistics
115 // They are printed under various flags, including:
116 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation.
117 // (In the latter two cases, they like other stats are printed to the log only.)
118
119 #ifndef PRODUCT
120 // These variables are put into one block to reduce relocations
121 // and make it simpler to print from the debugger.
122 static
123 struct nmethod_stats_struct {
124 int nmethod_count;
125 int total_size;
126 int relocation_size;
127 int consts_size;
128 int insts_size;
129 int stub_size;
130 int scopes_data_size;
131 int scopes_pcs_size;
132 int dependencies_size;
133 int handler_table_size;
134 int nul_chk_table_size;
135 int oops_size;
136
137 void note_nmethod(nmethod* nm) {
138 nmethod_count += 1;
139 total_size += nm->size();
140 relocation_size += nm->relocation_size();
141 consts_size += nm->consts_size();
142 insts_size += nm->insts_size();
143 stub_size += nm->stub_size();
144 oops_size += nm->oops_size();
145 scopes_data_size += nm->scopes_data_size();
146 scopes_pcs_size += nm->scopes_pcs_size();
147 dependencies_size += nm->dependencies_size();
148 handler_table_size += nm->handler_table_size();
149 nul_chk_table_size += nm->nul_chk_table_size();
150 }
151 void print_nmethod_stats() {
152 if (nmethod_count == 0) return;
153 tty->print_cr("Statistics for %d bytecoded nmethods:", nmethod_count);
154 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size);
155 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size);
156 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size);
157 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size);
158 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size);
159 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size);
160 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size);
161 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size);
162 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size);
163 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size);
164 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size);
165 }
166
167 int native_nmethod_count;
168 int native_total_size;
169 int native_relocation_size;
170 int native_insts_size;
171 int native_oops_size;
172 void note_native_nmethod(nmethod* nm) {
173 native_nmethod_count += 1;
174 native_total_size += nm->size();
175 native_relocation_size += nm->relocation_size();
176 native_insts_size += nm->insts_size();
177 native_oops_size += nm->oops_size();
178 }
179 void print_native_nmethod_stats() {
180 if (native_nmethod_count == 0) return;
181 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count);
182 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size);
183 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size);
184 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size);
185 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size);
186 }
187
188 int pc_desc_resets; // number of resets (= number of caches)
189 int pc_desc_queries; // queries to nmethod::find_pc_desc
190 int pc_desc_approx; // number of those which have approximate true
191 int pc_desc_repeats; // number of _pc_descs[0] hits
192 int pc_desc_hits; // number of LRU cache hits
193 int pc_desc_tests; // total number of PcDesc examinations
194 int pc_desc_searches; // total number of quasi-binary search steps
195 int pc_desc_adds; // number of LUR cache insertions
196
197 void print_pc_stats() {
198 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query",
199 pc_desc_queries,
200 (double)(pc_desc_tests + pc_desc_searches)
201 / pc_desc_queries);
202 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d",
203 pc_desc_resets,
204 pc_desc_queries, pc_desc_approx,
205 pc_desc_repeats, pc_desc_hits,
206 pc_desc_tests, pc_desc_searches, pc_desc_adds);
207 }
208 } nmethod_stats;
209 #endif //PRODUCT
210
211
212 //---------------------------------------------------------------------------------
213
214
215 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) {
216 assert(pc != NULL, "Must be non null");
217 assert(exception.not_null(), "Must be non null");
218 assert(handler != NULL, "Must be non null");
219
220 _count = 0;
221 _exception_type = exception->klass();
222 _next = NULL;
223
224 add_address_and_handler(pc,handler);
225 }
226
227
228 address ExceptionCache::match(Handle exception, address pc) {
229 assert(pc != NULL,"Must be non null");
230 assert(exception.not_null(),"Must be non null");
231 if (exception->klass() == exception_type()) {
232 return (test_address(pc));
233 }
234
235 return NULL;
236 }
237
238
239 bool ExceptionCache::match_exception_with_space(Handle exception) {
240 assert(exception.not_null(),"Must be non null");
241 if (exception->klass() == exception_type() && count() < cache_size) {
242 return true;
243 }
244 return false;
245 }
246
247
248 address ExceptionCache::test_address(address addr) {
249 for (int i=0; i<count(); i++) {
250 if (pc_at(i) == addr) {
251 return handler_at(i);
252 }
253 }
254 return NULL;
255 }
256
257
258 bool ExceptionCache::add_address_and_handler(address addr, address handler) {
259 if (test_address(addr) == handler) return true;
260 if (count() < cache_size) {
261 set_pc_at(count(),addr);
262 set_handler_at(count(), handler);
263 increment_count();
264 return true;
265 }
266 return false;
267 }
268
269
270 // private method for handling exception cache
271 // These methods are private, and used to manipulate the exception cache
272 // directly.
273 ExceptionCache* nmethod::exception_cache_entry_for_exception(Handle exception) {
274 ExceptionCache* ec = exception_cache();
275 while (ec != NULL) {
276 if (ec->match_exception_with_space(exception)) {
277 return ec;
278 }
279 ec = ec->next();
280 }
281 return NULL;
282 }
283
284
285 //-----------------------------------------------------------------------------
286
287
288 // Helper used by both find_pc_desc methods.
289 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) {
290 NOT_PRODUCT(++nmethod_stats.pc_desc_tests);
291 if (!approximate)
292 return pc->pc_offset() == pc_offset;
293 else
294 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset();
295 }
296
297 void PcDescCache::reset_to(PcDesc* initial_pc_desc) {
298 if (initial_pc_desc == NULL) {
299 _pc_descs[0] = NULL; // native method; no PcDescs at all
300 return;
301 }
302 NOT_PRODUCT(++nmethod_stats.pc_desc_resets);
303 // reset the cache by filling it with benign (non-null) values
304 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel");
305 for (int i = 0; i < cache_size; i++)
306 _pc_descs[i] = initial_pc_desc;
307 }
308
309 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) {
310 NOT_PRODUCT(++nmethod_stats.pc_desc_queries);
311 NOT_PRODUCT(if (approximate) ++nmethod_stats.pc_desc_approx);
312
313 // Note: one might think that caching the most recently
314 // read value separately would be a win, but one would be
315 // wrong. When many threads are updating it, the cache
316 // line it's in would bounce between caches, negating
317 // any benefit.
318
319 // In order to prevent race conditions do not load cache elements
320 // repeatedly, but use a local copy:
321 PcDesc* res;
322
323 // Step one: Check the most recently added value.
324 res = _pc_descs[0];
325 if (res == NULL) return NULL; // native method; no PcDescs at all
326 if (match_desc(res, pc_offset, approximate)) {
327 NOT_PRODUCT(++nmethod_stats.pc_desc_repeats);
328 return res;
329 }
330
331 // Step two: Check the rest of the LRU cache.
332 for (int i = 1; i < cache_size; ++i) {
333 res = _pc_descs[i];
334 if (res->pc_offset() < 0) break; // optimization: skip empty cache
335 if (match_desc(res, pc_offset, approximate)) {
336 NOT_PRODUCT(++nmethod_stats.pc_desc_hits);
337 return res;
338 }
339 }
340
341 // Report failure.
342 return NULL;
343 }
344
345 void PcDescCache::add_pc_desc(PcDesc* pc_desc) {
346 NOT_PRODUCT(++nmethod_stats.pc_desc_adds);
347 // Update the LRU cache by shifting pc_desc forward.
348 for (int i = 0; i < cache_size; i++) {
349 PcDesc* next = _pc_descs[i];
350 _pc_descs[i] = pc_desc;
351 pc_desc = next;
352 }
353 }
354
355 // adjust pcs_size so that it is a multiple of both oopSize and
356 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple
357 // of oopSize, then 2*sizeof(PcDesc) is)
358 static int adjust_pcs_size(int pcs_size) {
359 int nsize = round_to(pcs_size, oopSize);
360 if ((nsize % sizeof(PcDesc)) != 0) {
361 nsize = pcs_size + sizeof(PcDesc);
362 }
363 assert((nsize % oopSize) == 0, "correct alignment");
364 return nsize;
365 }
366
367 //-----------------------------------------------------------------------------
368
369
370 void nmethod::add_exception_cache_entry(ExceptionCache* new_entry) {
371 assert(ExceptionCache_lock->owned_by_self(),"Must hold the ExceptionCache_lock");
372 assert(new_entry != NULL,"Must be non null");
373 assert(new_entry->next() == NULL, "Must be null");
374
375 if (exception_cache() != NULL) {
376 new_entry->set_next(exception_cache());
377 }
378 set_exception_cache(new_entry);
379 }
380
381 void nmethod::remove_from_exception_cache(ExceptionCache* ec) {
382 ExceptionCache* prev = NULL;
383 ExceptionCache* curr = exception_cache();
384 assert(curr != NULL, "nothing to remove");
385 // find the previous and next entry of ec
386 while (curr != ec) {
387 prev = curr;
388 curr = curr->next();
389 assert(curr != NULL, "ExceptionCache not found");
390 }
391 // now: curr == ec
392 ExceptionCache* next = curr->next();
393 if (prev == NULL) {
394 set_exception_cache(next);
395 } else {
396 prev->set_next(next);
397 }
398 delete curr;
399 }
400
401
402 // public method for accessing the exception cache
403 // These are the public access methods.
404 address nmethod::handler_for_exception_and_pc(Handle exception, address pc) {
405 // We never grab a lock to read the exception cache, so we may
406 // have false negatives. This is okay, as it can only happen during
407 // the first few exception lookups for a given nmethod.
408 ExceptionCache* ec = exception_cache();
409 while (ec != NULL) {
410 address ret_val;
411 if ((ret_val = ec->match(exception,pc)) != NULL) {
412 return ret_val;
413 }
414 ec = ec->next();
415 }
416 return NULL;
417 }
418
419
420 void nmethod::add_handler_for_exception_and_pc(Handle exception, address pc, address handler) {
421 // There are potential race conditions during exception cache updates, so we
422 // must own the ExceptionCache_lock before doing ANY modifications. Because
423 // we don't lock during reads, it is possible to have several threads attempt
424 // to update the cache with the same data. We need to check for already inserted
425 // copies of the current data before adding it.
426
427 MutexLocker ml(ExceptionCache_lock);
428 ExceptionCache* target_entry = exception_cache_entry_for_exception(exception);
429
430 if (target_entry == NULL || !target_entry->add_address_and_handler(pc,handler)) {
431 target_entry = new ExceptionCache(exception,pc,handler);
432 add_exception_cache_entry(target_entry);
433 }
434 }
435
436
437 //-------------end of code for ExceptionCache--------------
438
439
440 int nmethod::total_size() const {
441 return
442 consts_size() +
443 insts_size() +
444 stub_size() +
445 scopes_data_size() +
446 scopes_pcs_size() +
447 handler_table_size() +
448 nul_chk_table_size();
449 }
450
451 const char* nmethod::compile_kind() const {
452 if (is_osr_method()) return "osr";
453 if (method() != NULL && is_native_method()) return "c2n";
454 return NULL;
455 }
456
457 // Fill in default values for various flag fields
458 void nmethod::init_defaults() {
459 _state = alive;
460 _marked_for_reclamation = 0;
461 _has_flushed_dependencies = 0;
462 _speculatively_disconnected = 0;
463 _has_unsafe_access = 0;
464 _has_method_handle_invokes = 0;
465 _marked_for_deoptimization = 0;
466 _lock_count = 0;
467 _stack_traversal_mark = 0;
468 _unload_reported = false; // jvmti state
469
470 #ifdef ASSERT
471 _oops_are_stale = false;
472 #endif
473
474 _oops_do_mark_link = NULL;
475 _jmethod_id = NULL;
476 _osr_link = NULL;
477 _scavenge_root_link = NULL;
478 _scavenge_root_state = 0;
479 _saved_nmethod_link = NULL;
480 _compiler = NULL;
481
482 #ifdef HAVE_DTRACE_H
483 _trap_offset = 0;
484 #endif // def HAVE_DTRACE_H
485 }
486
487
488 nmethod* nmethod::new_native_nmethod(methodHandle method,
489 int compile_id,
490 CodeBuffer *code_buffer,
491 int vep_offset,
492 int frame_complete,
493 int frame_size,
494 ByteSize basic_lock_owner_sp_offset,
495 ByteSize basic_lock_sp_offset,
496 OopMapSet* oop_maps) {
497 // create nmethod
498 nmethod* nm = NULL;
499 {
500 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
501 int native_nmethod_size = allocation_size(code_buffer, sizeof(nmethod));
502 CodeOffsets offsets;
503 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
504 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
505 nm = new (native_nmethod_size)
506 nmethod(method(), native_nmethod_size, compile_id, &offsets,
507 code_buffer, frame_size,
508 basic_lock_owner_sp_offset, basic_lock_sp_offset,
509 oop_maps);
510 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_native_nmethod(nm));
511 if (PrintAssembly && nm != NULL)
512 Disassembler::decode(nm);
513 }
514 // verify nmethod
515 debug_only(if (nm) nm->verify();) // might block
516
517 if (nm != NULL) {
518 nm->log_new_nmethod();
519 }
520
521 return nm;
522 }
523
524 #ifdef HAVE_DTRACE_H
525 nmethod* nmethod::new_dtrace_nmethod(methodHandle method,
526 CodeBuffer *code_buffer,
527 int vep_offset,
528 int trap_offset,
529 int frame_complete,
530 int frame_size) {
531 // create nmethod
532 nmethod* nm = NULL;
533 {
534 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
535 int nmethod_size = allocation_size(code_buffer, sizeof(nmethod));
536 CodeOffsets offsets;
537 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
538 offsets.set_value(CodeOffsets::Dtrace_trap, trap_offset);
539 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
540
541 nm = new (nmethod_size) nmethod(method(), nmethod_size, &offsets, code_buffer, frame_size);
542
543 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_nmethod(nm));
544 if (PrintAssembly && nm != NULL)
545 Disassembler::decode(nm);
546 }
547 // verify nmethod
548 debug_only(if (nm) nm->verify();) // might block
549
550 if (nm != NULL) {
551 nm->log_new_nmethod();
552 }
553
554 return nm;
555 }
556
557 #endif // def HAVE_DTRACE_H
558
559 nmethod* nmethod::new_nmethod(methodHandle method,
560 int compile_id,
561 int entry_bci,
562 CodeOffsets* offsets,
563 int orig_pc_offset,
564 DebugInformationRecorder* debug_info,
565 Dependencies* dependencies,
566 CodeBuffer* code_buffer, int frame_size,
567 OopMapSet* oop_maps,
568 ExceptionHandlerTable* handler_table,
569 ImplicitExceptionTable* nul_chk_table,
570 AbstractCompiler* compiler,
571 int comp_level
572 )
573 {
574 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
575 // create nmethod
576 nmethod* nm = NULL;
577 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
578 int nmethod_size =
579 allocation_size(code_buffer, sizeof(nmethod))
580 + adjust_pcs_size(debug_info->pcs_size())
581 + round_to(dependencies->size_in_bytes() , oopSize)
582 + round_to(handler_table->size_in_bytes(), oopSize)
583 + round_to(nul_chk_table->size_in_bytes(), oopSize)
584 + round_to(debug_info->data_size() , oopSize);
585 nm = new (nmethod_size)
586 nmethod(method(), nmethod_size, compile_id, entry_bci, offsets,
587 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size,
588 oop_maps,
589 handler_table,
590 nul_chk_table,
591 compiler,
592 comp_level);
593 if (nm != NULL) {
594 // To make dependency checking during class loading fast, record
595 // the nmethod dependencies in the classes it is dependent on.
596 // This allows the dependency checking code to simply walk the
597 // class hierarchy above the loaded class, checking only nmethods
598 // which are dependent on those classes. The slow way is to
599 // check every nmethod for dependencies which makes it linear in
600 // the number of methods compiled. For applications with a lot
601 // classes the slow way is too slow.
602 for (Dependencies::DepStream deps(nm); deps.next(); ) {
603 klassOop klass = deps.context_type();
604 if (klass == NULL) continue; // ignore things like evol_method
605
606 // record this nmethod as dependent on this klass
607 instanceKlass::cast(klass)->add_dependent_nmethod(nm);
608 }
609 }
610 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_nmethod(nm));
611 if (PrintAssembly && nm != NULL)
612 Disassembler::decode(nm);
613 }
614
615 // verify nmethod
616 debug_only(if (nm) nm->verify();) // might block
617
618 if (nm != NULL) {
619 nm->log_new_nmethod();
620 }
621
622 // done
623 return nm;
624 }
625
626
627 // For native wrappers
628 nmethod::nmethod(
629 methodOop method,
630 int nmethod_size,
631 int compile_id,
632 CodeOffsets* offsets,
633 CodeBuffer* code_buffer,
634 int frame_size,
635 ByteSize basic_lock_owner_sp_offset,
636 ByteSize basic_lock_sp_offset,
637 OopMapSet* oop_maps )
638 : CodeBlob("native nmethod", code_buffer, sizeof(nmethod),
639 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps),
640 _native_receiver_sp_offset(basic_lock_owner_sp_offset),
641 _native_basic_lock_sp_offset(basic_lock_sp_offset)
642 {
643 {
644 debug_only(No_Safepoint_Verifier nsv;)
645 assert_locked_or_safepoint(CodeCache_lock);
646
647 init_defaults();
648 _method = method;
649 _entry_bci = InvocationEntryBci;
650 // We have no exception handler or deopt handler make the
651 // values something that will never match a pc like the nmethod vtable entry
652 _exception_offset = 0;
653 _deoptimize_offset = 0;
654 _deoptimize_mh_offset = 0;
655 _orig_pc_offset = 0;
656
657 _consts_offset = data_offset();
658 _stub_offset = data_offset();
659 _oops_offset = data_offset();
660 _scopes_data_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize);
661 _scopes_pcs_offset = _scopes_data_offset;
662 _dependencies_offset = _scopes_pcs_offset;
663 _handler_table_offset = _dependencies_offset;
664 _nul_chk_table_offset = _handler_table_offset;
665 _nmethod_end_offset = _nul_chk_table_offset;
666 _compile_id = compile_id;
667 _comp_level = CompLevel_none;
668 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
669 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
670 _osr_entry_point = NULL;
671 _exception_cache = NULL;
672 _pc_desc_cache.reset_to(NULL);
673 #ifdef COMPILER1
674 _needs_recomp = false;
675 #endif
676
677 code_buffer->copy_oops_to(this);
678 if (ScavengeRootsInCode && detect_scavenge_root_oops()) {
679 CodeCache::add_scavenge_root_nmethod(this);
680 }
681 debug_only(verify_scavenge_root_oops());
682 CodeCache::commit(this);
683 }
684
685 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
686 ttyLocker ttyl; // keep the following output all in one block
687 // This output goes directly to the tty, not the compiler log.
688 // To enable tools to match it up with the compilation activity,
689 // be sure to tag this tty output with the compile ID.
690 if (xtty != NULL) {
691 xtty->begin_head("print_native_nmethod");
692 xtty->method(_method);
693 xtty->stamp();
694 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
695 }
696 // print the header part first
697 print();
698 // then print the requested information
699 if (PrintNativeNMethods) {
700 print_code();
701 oop_maps->print();
702 }
703 if (PrintRelocations) {
704 print_relocations();
705 }
706 if (xtty != NULL) {
707 xtty->tail("print_native_nmethod");
708 }
709 }
710 Events::log("Create nmethod " INTPTR_FORMAT, this);
711 }
712
713 // For dtrace wrappers
714 #ifdef HAVE_DTRACE_H
715 nmethod::nmethod(
716 methodOop method,
717 int nmethod_size,
718 CodeOffsets* offsets,
719 CodeBuffer* code_buffer,
720 int frame_size)
721 : CodeBlob("dtrace nmethod", code_buffer, sizeof(nmethod),
722 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, NULL),
723 _native_receiver_sp_offset(in_ByteSize(-1)),
724 _native_basic_lock_sp_offset(in_ByteSize(-1))
725 {
726 {
727 debug_only(No_Safepoint_Verifier nsv;)
728 assert_locked_or_safepoint(CodeCache_lock);
729
730 init_defaults();
731 _method = method;
732 _entry_bci = InvocationEntryBci;
733 // We have no exception handler or deopt handler make the
734 // values something that will never match a pc like the nmethod vtable entry
735 _exception_offset = 0;
736 _deoptimize_offset = 0;
737 _deoptimize_mh_offset = 0;
738 _unwind_handler_offset = -1;
739 _trap_offset = offsets->value(CodeOffsets::Dtrace_trap);
740 _orig_pc_offset = 0;
741 _consts_offset = data_offset();
742 _stub_offset = data_offset();
743 _oops_offset = data_offset();
744 _scopes_data_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize);
745 _scopes_pcs_offset = _scopes_data_offset;
746 _dependencies_offset = _scopes_pcs_offset;
747 _handler_table_offset = _dependencies_offset;
748 _nul_chk_table_offset = _handler_table_offset;
749 _nmethod_end_offset = _nul_chk_table_offset;
750 _compile_id = 0; // default
751 _comp_level = CompLevel_none;
752 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
753 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
754 _osr_entry_point = NULL;
755 _exception_cache = NULL;
756 _pc_desc_cache.reset_to(NULL);
757 #ifdef COMPILER1
758 _needs_recomp = false;
759 #endif
760
761 code_buffer->copy_oops_to(this);
762 debug_only(verify_scavenge_root_oops());
763 CodeCache::commit(this);
764 }
765
766 if (PrintNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
767 ttyLocker ttyl; // keep the following output all in one block
768 // This output goes directly to the tty, not the compiler log.
769 // To enable tools to match it up with the compilation activity,
770 // be sure to tag this tty output with the compile ID.
771 if (xtty != NULL) {
772 xtty->begin_head("print_dtrace_nmethod");
773 xtty->method(_method);
774 xtty->stamp();
775 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
776 }
777 // print the header part first
778 print();
779 // then print the requested information
780 if (PrintNMethods) {
781 print_code();
782 }
783 if (PrintRelocations) {
784 print_relocations();
785 }
786 if (xtty != NULL) {
787 xtty->tail("print_dtrace_nmethod");
788 }
789 }
790 Events::log("Create nmethod " INTPTR_FORMAT, this);
791 }
792 #endif // def HAVE_DTRACE_H
793
794 void* nmethod::operator new(size_t size, int nmethod_size) {
795 // Always leave some room in the CodeCache for I2C/C2I adapters
796 if (CodeCache::largest_free_block() < CodeCacheMinimumFreeSpace) return NULL;
797 return CodeCache::allocate(nmethod_size);
798 }
799
800
801 nmethod::nmethod(
802 methodOop method,
803 int nmethod_size,
804 int compile_id,
805 int entry_bci,
806 CodeOffsets* offsets,
807 int orig_pc_offset,
808 DebugInformationRecorder* debug_info,
809 Dependencies* dependencies,
810 CodeBuffer *code_buffer,
811 int frame_size,
812 OopMapSet* oop_maps,
813 ExceptionHandlerTable* handler_table,
814 ImplicitExceptionTable* nul_chk_table,
815 AbstractCompiler* compiler,
816 int comp_level
817 )
818 : CodeBlob("nmethod", code_buffer, sizeof(nmethod),
819 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps),
820 _native_receiver_sp_offset(in_ByteSize(-1)),
821 _native_basic_lock_sp_offset(in_ByteSize(-1))
822 {
823 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
824 {
825 debug_only(No_Safepoint_Verifier nsv;)
826 assert_locked_or_safepoint(CodeCache_lock);
827
828 init_defaults();
829 _method = method;
830 _entry_bci = entry_bci;
831 _compile_id = compile_id;
832 _comp_level = comp_level;
833 _compiler = compiler;
834 _orig_pc_offset = orig_pc_offset;
835
836 // Section offsets
837 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts());
838 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs());
839
840 // Exception handler and deopt handler are in the stub section
841 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set");
842 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set");
843 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
844 _deoptimize_offset = _stub_offset + offsets->value(CodeOffsets::Deopt);
845 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
846 _deoptimize_mh_offset = _stub_offset + offsets->value(CodeOffsets::DeoptMH);
847 } else {
848 _deoptimize_mh_offset = -1;
849 }
850 if (offsets->value(CodeOffsets::UnwindHandler) != -1) {
851 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler);
852 } else {
853 _unwind_handler_offset = -1;
854 }
855
856 _oops_offset = data_offset();
857 _scopes_data_offset = _oops_offset + round_to(code_buffer->total_oop_size (), oopSize);
858 _scopes_pcs_offset = _scopes_data_offset + round_to(debug_info->data_size (), oopSize);
859 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
860 _handler_table_offset = _dependencies_offset + round_to(dependencies->size_in_bytes (), oopSize);
861 _nul_chk_table_offset = _handler_table_offset + round_to(handler_table->size_in_bytes(), oopSize);
862 _nmethod_end_offset = _nul_chk_table_offset + round_to(nul_chk_table->size_in_bytes(), oopSize);
863
864 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
865 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
866 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry);
867 _exception_cache = NULL;
868 _pc_desc_cache.reset_to(scopes_pcs_begin());
869
870 // Copy contents of ScopeDescRecorder to nmethod
871 code_buffer->copy_oops_to(this);
872 debug_info->copy_to(this);
873 dependencies->copy_to(this);
874 if (ScavengeRootsInCode && detect_scavenge_root_oops()) {
875 CodeCache::add_scavenge_root_nmethod(this);
876 }
877 debug_only(verify_scavenge_root_oops());
878
879 CodeCache::commit(this);
880
881 #ifdef COMPILER1
882 _needs_recomp = false;
883 #endif
884
885 // Copy contents of ExceptionHandlerTable to nmethod
886 handler_table->copy_to(this);
887 nul_chk_table->copy_to(this);
888
889 // we use the information of entry points to find out if a method is
890 // static or non static
891 assert(compiler->is_c2() ||
892 _method->is_static() == (entry_point() == _verified_entry_point),
893 " entry points must be same for static methods and vice versa");
894 }
895
896 bool printnmethods = PrintNMethods
897 || CompilerOracle::should_print(_method)
898 || CompilerOracle::has_option_string(_method, "PrintNMethods");
899 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
900 print_nmethod(printnmethods);
901 }
902
903 // Note: Do not verify in here as the CodeCache_lock is
904 // taken which would conflict with the CompiledIC_lock
905 // which taken during the verification of call sites.
906 // (was bug - gri 10/25/99)
907
908 Events::log("Create nmethod " INTPTR_FORMAT, this);
909 }
910
911
912 // Print a short set of xml attributes to identify this nmethod. The
913 // output should be embedded in some other element.
914 void nmethod::log_identity(xmlStream* log) const {
915 log->print(" compile_id='%d'", compile_id());
916 const char* nm_kind = compile_kind();
917 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind);
918 if (compiler() != NULL) {
919 log->print(" compiler='%s'", compiler()->name());
920 }
921 if (TieredCompilation) {
922 log->print(" level='%d'", comp_level());
923 }
924 }
925
926
927 #define LOG_OFFSET(log, name) \
928 if ((intptr_t)name##_end() - (intptr_t)name##_begin()) \
929 log->print(" " XSTR(name) "_offset='%d'" , \
930 (intptr_t)name##_begin() - (intptr_t)this)
931
932
933 void nmethod::log_new_nmethod() const {
934 if (LogCompilation && xtty != NULL) {
935 ttyLocker ttyl;
936 HandleMark hm;
937 xtty->begin_elem("nmethod");
938 log_identity(xtty);
939 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", code_begin(), size());
940 xtty->print(" address='" INTPTR_FORMAT "'", (intptr_t) this);
941
942 LOG_OFFSET(xtty, relocation);
943 LOG_OFFSET(xtty, consts);
944 LOG_OFFSET(xtty, insts);
945 LOG_OFFSET(xtty, stub);
946 LOG_OFFSET(xtty, scopes_data);
947 LOG_OFFSET(xtty, scopes_pcs);
948 LOG_OFFSET(xtty, dependencies);
949 LOG_OFFSET(xtty, handler_table);
950 LOG_OFFSET(xtty, nul_chk_table);
951 LOG_OFFSET(xtty, oops);
952
953 xtty->method(method());
954 xtty->stamp();
955 xtty->end_elem();
956 }
957 }
958
959 #undef LOG_OFFSET
960
961
962 // Print out more verbose output usually for a newly created nmethod.
963 void nmethod::print_on(outputStream* st, const char* msg) const {
964 if (st != NULL) {
965 ttyLocker ttyl;
966 CompileTask::print_compilation(st, this, msg);
967 if (WizardMode) st->print(" (" INTPTR_FORMAT ")", this);
968 }
969 }
970
971
972 void nmethod::print_nmethod(bool printmethod) {
973 ttyLocker ttyl; // keep the following output all in one block
974 if (xtty != NULL) {
975 xtty->begin_head("print_nmethod");
976 xtty->stamp();
977 xtty->end_head();
978 }
979 // print the header part first
980 print();
981 // then print the requested information
982 if (printmethod) {
983 print_code();
984 print_pcs();
985 oop_maps()->print();
986 }
987 if (PrintDebugInfo) {
988 print_scopes();
989 }
990 if (PrintRelocations) {
991 print_relocations();
992 }
993 if (PrintDependencies) {
994 print_dependencies();
995 }
996 if (PrintExceptionHandlers) {
997 print_handler_table();
998 print_nul_chk_table();
999 }
1000 if (xtty != NULL) {
1001 xtty->tail("print_nmethod");
1002 }
1003 }
1004
1005
1006 // Promote one word from an assembly-time handle to a live embedded oop.
1007 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
1008 if (handle == NULL ||
1009 // As a special case, IC oops are initialized to 1 or -1.
1010 handle == (jobject) Universe::non_oop_word()) {
1011 (*dest) = (oop) handle;
1012 } else {
1013 (*dest) = JNIHandles::resolve_non_null(handle);
1014 }
1015 }
1016
1017
1018 void nmethod::copy_oops(GrowableArray<jobject>* array) {
1019 //assert(oops_size() == 0, "do this handshake just once, please");
1020 int length = array->length();
1021 assert((address)(oops_begin() + length) <= data_end(), "oops big enough");
1022 oop* dest = oops_begin();
1023 for (int index = 0 ; index < length; index++) {
1024 initialize_immediate_oop(&dest[index], array->at(index));
1025 }
1026
1027 // Now we can fix up all the oops in the code. We need to do this
1028 // in the code because the assembler uses jobjects as placeholders.
1029 // The code and relocations have already been initialized by the
1030 // CodeBlob constructor, so it is valid even at this early point to
1031 // iterate over relocations and patch the code.
1032 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true);
1033 }
1034
1035
1036 bool nmethod::is_at_poll_return(address pc) {
1037 RelocIterator iter(this, pc, pc+1);
1038 while (iter.next()) {
1039 if (iter.type() == relocInfo::poll_return_type)
1040 return true;
1041 }
1042 return false;
1043 }
1044
1045
1046 bool nmethod::is_at_poll_or_poll_return(address pc) {
1047 RelocIterator iter(this, pc, pc+1);
1048 while (iter.next()) {
1049 relocInfo::relocType t = iter.type();
1050 if (t == relocInfo::poll_return_type || t == relocInfo::poll_type)
1051 return true;
1052 }
1053 return false;
1054 }
1055
1056
1057 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) {
1058 // re-patch all oop-bearing instructions, just in case some oops moved
1059 RelocIterator iter(this, begin, end);
1060 while (iter.next()) {
1061 if (iter.type() == relocInfo::oop_type) {
1062 oop_Relocation* reloc = iter.oop_reloc();
1063 if (initialize_immediates && reloc->oop_is_immediate()) {
1064 oop* dest = reloc->oop_addr();
1065 initialize_immediate_oop(dest, (jobject) *dest);
1066 }
1067 // Refresh the oop-related bits of this instruction.
1068 reloc->fix_oop_relocation();
1069 }
1070
1071 // There must not be any interfering patches or breakpoints.
1072 assert(!(iter.type() == relocInfo::breakpoint_type
1073 && iter.breakpoint_reloc()->active()),
1074 "no active breakpoint");
1075 }
1076 }
1077
1078
1079 void nmethod::verify_oop_relocations() {
1080 // Ensure sure that the code matches the current oop values
1081 RelocIterator iter(this, NULL, NULL);
1082 while (iter.next()) {
1083 if (iter.type() == relocInfo::oop_type) {
1084 oop_Relocation* reloc = iter.oop_reloc();
1085 if (!reloc->oop_is_immediate()) {
1086 reloc->verify_oop_relocation();
1087 }
1088 }
1089 }
1090 }
1091
1092
1093 ScopeDesc* nmethod::scope_desc_at(address pc) {
1094 PcDesc* pd = pc_desc_at(pc);
1095 guarantee(pd != NULL, "scope must be present");
1096 return new ScopeDesc(this, pd->scope_decode_offset(),
1097 pd->obj_decode_offset(), pd->should_reexecute(),
1098 pd->return_oop());
1099 }
1100
1101
1102 void nmethod::clear_inline_caches() {
1103 assert(SafepointSynchronize::is_at_safepoint(), "cleaning of IC's only allowed at safepoint");
1104 if (is_zombie()) {
1105 return;
1106 }
1107
1108 RelocIterator iter(this);
1109 while (iter.next()) {
1110 iter.reloc()->clear_inline_cache();
1111 }
1112 }
1113
1114
1115 void nmethod::cleanup_inline_caches() {
1116
1117 assert_locked_or_safepoint(CompiledIC_lock);
1118
1119 // If the method is not entrant or zombie then a JMP is plastered over the
1120 // first few bytes. If an oop in the old code was there, that oop
1121 // should not get GC'd. Skip the first few bytes of oops on
1122 // not-entrant methods.
1123 address low_boundary = verified_entry_point();
1124 if (!is_in_use()) {
1125 low_boundary += NativeJump::instruction_size;
1126 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1127 // This means that the low_boundary is going to be a little too high.
1128 // This shouldn't matter, since oops of non-entrant methods are never used.
1129 // In fact, why are we bothering to look at oops in a non-entrant method??
1130 }
1131
1132 // Find all calls in an nmethod, and clear the ones that points to zombie methods
1133 ResourceMark rm;
1134 RelocIterator iter(this, low_boundary);
1135 while(iter.next()) {
1136 switch(iter.type()) {
1137 case relocInfo::virtual_call_type:
1138 case relocInfo::opt_virtual_call_type: {
1139 CompiledIC *ic = CompiledIC_at(iter.reloc());
1140 // Ok, to lookup references to zombies here
1141 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
1142 if( cb != NULL && cb->is_nmethod() ) {
1143 nmethod* nm = (nmethod*)cb;
1144 // Clean inline caches pointing to both zombie and not_entrant methods
1145 if (!nm->is_in_use() || (nm->method()->code() != nm)) ic->set_to_clean();
1146 }
1147 break;
1148 }
1149 case relocInfo::static_call_type: {
1150 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
1151 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
1152 if( cb != NULL && cb->is_nmethod() ) {
1153 nmethod* nm = (nmethod*)cb;
1154 // Clean inline caches pointing to both zombie and not_entrant methods
1155 if (!nm->is_in_use() || (nm->method()->code() != nm)) csc->set_to_clean();
1156 }
1157 break;
1158 }
1159 }
1160 }
1161 }
1162
1163 // This is a private interface with the sweeper.
1164 void nmethod::mark_as_seen_on_stack() {
1165 assert(is_not_entrant(), "must be a non-entrant method");
1166 // Set the traversal mark to ensure that the sweeper does 2
1167 // cleaning passes before moving to zombie.
1168 set_stack_traversal_mark(NMethodSweeper::traversal_count());
1169 }
1170
1171 // Tell if a non-entrant method can be converted to a zombie (i.e.,
1172 // there are no activations on the stack, not in use by the VM,
1173 // and not in use by the ServiceThread)
1174 bool nmethod::can_not_entrant_be_converted() {
1175 assert(is_not_entrant(), "must be a non-entrant method");
1176
1177 // Since the nmethod sweeper only does partial sweep the sweeper's traversal
1178 // count can be greater than the stack traversal count before it hits the
1179 // nmethod for the second time.
1180 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count() &&
1181 !is_locked_by_vm();
1182 }
1183
1184 void nmethod::inc_decompile_count() {
1185 if (!is_compiled_by_c2()) return;
1186 // Could be gated by ProfileTraps, but do not bother...
1187 methodOop m = method();
1188 if (m == NULL) return;
1189 methodDataOop mdo = m->method_data();
1190 if (mdo == NULL) return;
1191 // There is a benign race here. See comments in methodDataOop.hpp.
1192 mdo->inc_decompile_count();
1193 }
1194
1195 void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) {
1196
1197 post_compiled_method_unload();
1198
1199 // Since this nmethod is being unloaded, make sure that dependencies
1200 // recorded in instanceKlasses get flushed and pass non-NULL closure to
1201 // indicate that this work is being done during a GC.
1202 assert(Universe::heap()->is_gc_active(), "should only be called during gc");
1203 assert(is_alive != NULL, "Should be non-NULL");
1204 // A non-NULL is_alive closure indicates that this is being called during GC.
1205 flush_dependencies(is_alive);
1206
1207 // Break cycle between nmethod & method
1208 if (TraceClassUnloading && WizardMode) {
1209 tty->print_cr("[Class unloading: Making nmethod " INTPTR_FORMAT
1210 " unloadable], methodOop(" INTPTR_FORMAT
1211 "), cause(" INTPTR_FORMAT ")",
1212 this, (address)_method, (address)cause);
1213 if (!Universe::heap()->is_gc_active())
1214 cause->klass()->print();
1215 }
1216 // Unlink the osr method, so we do not look this up again
1217 if (is_osr_method()) {
1218 invalidate_osr_method();
1219 }
1220 // If _method is already NULL the methodOop is about to be unloaded,
1221 // so we don't have to break the cycle. Note that it is possible to
1222 // have the methodOop live here, in case we unload the nmethod because
1223 // it is pointing to some oop (other than the methodOop) being unloaded.
1224 if (_method != NULL) {
1225 // OSR methods point to the methodOop, but the methodOop does not
1226 // point back!
1227 if (_method->code() == this) {
1228 _method->clear_code(); // Break a cycle
1229 }
1230 _method = NULL; // Clear the method of this dead nmethod
1231 }
1232 // Make the class unloaded - i.e., change state and notify sweeper
1233 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
1234 if (is_in_use()) {
1235 // Transitioning directly from live to unloaded -- so
1236 // we need to force a cache clean-up; remember this
1237 // for later on.
1238 CodeCache::set_needs_cache_clean(true);
1239 }
1240 _state = unloaded;
1241
1242 // Log the unloading.
1243 log_state_change();
1244
1245 // The methodOop is gone at this point
1246 assert(_method == NULL, "Tautology");
1247
1248 set_osr_link(NULL);
1249 //set_scavenge_root_link(NULL); // done by prune_scavenge_root_nmethods
1250 NMethodSweeper::notify(this);
1251 }
1252
1253 void nmethod::invalidate_osr_method() {
1254 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
1255 // Remove from list of active nmethods
1256 if (method() != NULL)
1257 instanceKlass::cast(method()->method_holder())->remove_osr_nmethod(this);
1258 // Set entry as invalid
1259 _entry_bci = InvalidOSREntryBci;
1260 }
1261
1262 void nmethod::log_state_change() const {
1263 if (LogCompilation) {
1264 if (xtty != NULL) {
1265 ttyLocker ttyl; // keep the following output all in one block
1266 if (_state == unloaded) {
1267 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'",
1268 os::current_thread_id());
1269 } else {
1270 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s",
1271 os::current_thread_id(),
1272 (_state == zombie ? " zombie='1'" : ""));
1273 }
1274 log_identity(xtty);
1275 xtty->stamp();
1276 xtty->end_elem();
1277 }
1278 }
1279 if (PrintCompilation && _state != unloaded) {
1280 print_on(tty, _state == zombie ? "made zombie" : "made not entrant");
1281 }
1282 }
1283
1284 // Common functionality for both make_not_entrant and make_zombie
1285 bool nmethod::make_not_entrant_or_zombie(unsigned int state) {
1286 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant");
1287 assert(!is_zombie(), "should not already be a zombie");
1288
1289 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below.
1290 nmethodLocker nml(this);
1291 methodHandle the_method(method());
1292 No_Safepoint_Verifier nsv;
1293
1294 {
1295 // invalidate osr nmethod before acquiring the patching lock since
1296 // they both acquire leaf locks and we don't want a deadlock.
1297 // This logic is equivalent to the logic below for patching the
1298 // verified entry point of regular methods.
1299 if (is_osr_method()) {
1300 // this effectively makes the osr nmethod not entrant
1301 invalidate_osr_method();
1302 }
1303
1304 // Enter critical section. Does not block for safepoint.
1305 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1306
1307 if (_state == state) {
1308 // another thread already performed this transition so nothing
1309 // to do, but return false to indicate this.
1310 return false;
1311 }
1312
1313 // The caller can be calling the method statically or through an inline
1314 // cache call.
1315 if (!is_osr_method() && !is_not_entrant()) {
1316 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
1317 SharedRuntime::get_handle_wrong_method_stub());
1318 }
1319
1320 if (is_in_use()) {
1321 // It's a true state change, so mark the method as decompiled.
1322 // Do it only for transition from alive.
1323 inc_decompile_count();
1324 }
1325
1326 // Change state
1327 _state = state;
1328
1329 // Log the transition once
1330 log_state_change();
1331
1332 // Remove nmethod from method.
1333 // We need to check if both the _code and _from_compiled_code_entry_point
1334 // refer to this nmethod because there is a race in setting these two fields
1335 // in methodOop as seen in bugid 4947125.
1336 // If the vep() points to the zombie nmethod, the memory for the nmethod
1337 // could be flushed and the compiler and vtable stubs could still call
1338 // through it.
1339 if (method() != NULL && (method()->code() == this ||
1340 method()->from_compiled_entry() == verified_entry_point())) {
1341 HandleMark hm;
1342 method()->clear_code();
1343 }
1344
1345 if (state == not_entrant) {
1346 mark_as_seen_on_stack();
1347 }
1348
1349 } // leave critical region under Patching_lock
1350
1351 // When the nmethod becomes zombie it is no longer alive so the
1352 // dependencies must be flushed. nmethods in the not_entrant
1353 // state will be flushed later when the transition to zombie
1354 // happens or they get unloaded.
1355 if (state == zombie) {
1356 {
1357 // Flushing dependecies must be done before any possible
1358 // safepoint can sneak in, otherwise the oops used by the
1359 // dependency logic could have become stale.
1360 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1361 flush_dependencies(NULL);
1362 }
1363
1364 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload
1365 // event and it hasn't already been reported for this nmethod then
1366 // report it now. The event may have been reported earilier if the GC
1367 // marked it for unloading). JvmtiDeferredEventQueue support means
1368 // we no longer go to a safepoint here.
1369 post_compiled_method_unload();
1370
1371 #ifdef ASSERT
1372 // It's no longer safe to access the oops section since zombie
1373 // nmethods aren't scanned for GC.
1374 _oops_are_stale = true;
1375 #endif
1376 } else {
1377 assert(state == not_entrant, "other cases may need to be handled differently");
1378 }
1379
1380 if (TraceCreateZombies) {
1381 tty->print_cr("nmethod <" INTPTR_FORMAT "> code made %s", this, (state == not_entrant) ? "not entrant" : "zombie");
1382 }
1383
1384 // Make sweeper aware that there is a zombie method that needs to be removed
1385 NMethodSweeper::notify(this);
1386
1387 return true;
1388 }
1389
1390 void nmethod::flush() {
1391 // Note that there are no valid oops in the nmethod anymore.
1392 assert(is_zombie() || (is_osr_method() && is_unloaded()), "must be a zombie method");
1393 assert(is_marked_for_reclamation() || (is_osr_method() && is_unloaded()), "must be marked for reclamation");
1394
1395 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed");
1396 assert_locked_or_safepoint(CodeCache_lock);
1397
1398 // completely deallocate this method
1399 EventMark m("flushing nmethod " INTPTR_FORMAT " %s", this, "");
1400 if (PrintMethodFlushing) {
1401 tty->print_cr("*flushing nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT "/Free CodeCache:" SIZE_FORMAT "Kb",
1402 _compile_id, this, CodeCache::nof_blobs(), CodeCache::unallocated_capacity()/1024);
1403 }
1404
1405 // We need to deallocate any ExceptionCache data.
1406 // Note that we do not need to grab the nmethod lock for this, it
1407 // better be thread safe if we're disposing of it!
1408 ExceptionCache* ec = exception_cache();
1409 set_exception_cache(NULL);
1410 while(ec != NULL) {
1411 ExceptionCache* next = ec->next();
1412 delete ec;
1413 ec = next;
1414 }
1415
1416 if (on_scavenge_root_list()) {
1417 CodeCache::drop_scavenge_root_nmethod(this);
1418 }
1419
1420 if (is_speculatively_disconnected()) {
1421 CodeCache::remove_saved_code(this);
1422 }
1423
1424 #ifdef SHARK
1425 ((SharkCompiler *) compiler())->free_compiled_method(insts_begin());
1426 #endif // SHARK
1427
1428 ((CodeBlob*)(this))->flush();
1429
1430 CodeCache::free(this);
1431 }
1432
1433
1434 //
1435 // Notify all classes this nmethod is dependent on that it is no
1436 // longer dependent. This should only be called in two situations.
1437 // First, when a nmethod transitions to a zombie all dependents need
1438 // to be clear. Since zombification happens at a safepoint there's no
1439 // synchronization issues. The second place is a little more tricky.
1440 // During phase 1 of mark sweep class unloading may happen and as a
1441 // result some nmethods may get unloaded. In this case the flushing
1442 // of dependencies must happen during phase 1 since after GC any
1443 // dependencies in the unloaded nmethod won't be updated, so
1444 // traversing the dependency information in unsafe. In that case this
1445 // function is called with a non-NULL argument and this function only
1446 // notifies instanceKlasses that are reachable
1447
1448 void nmethod::flush_dependencies(BoolObjectClosure* is_alive) {
1449 assert_locked_or_safepoint(CodeCache_lock);
1450 assert(Universe::heap()->is_gc_active() == (is_alive != NULL),
1451 "is_alive is non-NULL if and only if we are called during GC");
1452 if (!has_flushed_dependencies()) {
1453 set_has_flushed_dependencies();
1454 for (Dependencies::DepStream deps(this); deps.next(); ) {
1455 klassOop klass = deps.context_type();
1456 if (klass == NULL) continue; // ignore things like evol_method
1457
1458 // During GC the is_alive closure is non-NULL, and is used to
1459 // determine liveness of dependees that need to be updated.
1460 if (is_alive == NULL || is_alive->do_object_b(klass)) {
1461 instanceKlass::cast(klass)->remove_dependent_nmethod(this);
1462 }
1463 }
1464 }
1465 }
1466
1467
1468 // If this oop is not live, the nmethod can be unloaded.
1469 bool nmethod::can_unload(BoolObjectClosure* is_alive,
1470 OopClosure* keep_alive,
1471 oop* root, bool unloading_occurred) {
1472 assert(root != NULL, "just checking");
1473 oop obj = *root;
1474 if (obj == NULL || is_alive->do_object_b(obj)) {
1475 return false;
1476 }
1477 if (obj->is_compiledICHolder()) {
1478 compiledICHolderOop cichk_oop = compiledICHolderOop(obj);
1479 if (is_alive->do_object_b(
1480 cichk_oop->holder_method()->method_holder()) &&
1481 is_alive->do_object_b(cichk_oop->holder_klass())) {
1482 // The oop should be kept alive
1483 keep_alive->do_oop(root);
1484 return false;
1485 }
1486 }
1487 // If ScavengeRootsInCode is true, an nmethod might be unloaded
1488 // simply because one of its constant oops has gone dead.
1489 // No actual classes need to be unloaded in order for this to occur.
1490 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading");
1491 make_unloaded(is_alive, obj);
1492 return true;
1493 }
1494
1495 // ------------------------------------------------------------------
1496 // post_compiled_method_load_event
1497 // new method for install_code() path
1498 // Transfer information from compilation to jvmti
1499 void nmethod::post_compiled_method_load_event() {
1500
1501 methodOop moop = method();
1502 #ifndef USDT2
1503 HS_DTRACE_PROBE8(hotspot, compiled__method__load,
1504 moop->klass_name()->bytes(),
1505 moop->klass_name()->utf8_length(),
1506 moop->name()->bytes(),
1507 moop->name()->utf8_length(),
1508 moop->signature()->bytes(),
1509 moop->signature()->utf8_length(),
1510 insts_begin(), insts_size());
1511 #else /* USDT2 */
1512 HOTSPOT_COMPILED_METHOD_LOAD(
1513 (char *) moop->klass_name()->bytes(),
1514 moop->klass_name()->utf8_length(),
1515 (char *) moop->name()->bytes(),
1516 moop->name()->utf8_length(),
1517 (char *) moop->signature()->bytes(),
1518 moop->signature()->utf8_length(),
1519 insts_begin(), insts_size());
1520 #endif /* USDT2 */
1521
1522 if (JvmtiExport::should_post_compiled_method_load() ||
1523 JvmtiExport::should_post_compiled_method_unload()) {
1524 get_and_cache_jmethod_id();
1525 }
1526
1527 if (JvmtiExport::should_post_compiled_method_load()) {
1528 // Let the Service thread (which is a real Java thread) post the event
1529 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1530 JvmtiDeferredEventQueue::enqueue(
1531 JvmtiDeferredEvent::compiled_method_load_event(this));
1532 }
1533 }
1534
1535 jmethodID nmethod::get_and_cache_jmethod_id() {
1536 if (_jmethod_id == NULL) {
1537 // Cache the jmethod_id since it can no longer be looked up once the
1538 // method itself has been marked for unloading.
1539 _jmethod_id = method()->jmethod_id();
1540 }
1541 return _jmethod_id;
1542 }
1543
1544 void nmethod::post_compiled_method_unload() {
1545 if (unload_reported()) {
1546 // During unloading we transition to unloaded and then to zombie
1547 // and the unloading is reported during the first transition.
1548 return;
1549 }
1550
1551 assert(_method != NULL && !is_unloaded(), "just checking");
1552 DTRACE_METHOD_UNLOAD_PROBE(method());
1553
1554 // If a JVMTI agent has enabled the CompiledMethodUnload event then
1555 // post the event. Sometime later this nmethod will be made a zombie
1556 // by the sweeper but the methodOop will not be valid at that point.
1557 // If the _jmethod_id is null then no load event was ever requested
1558 // so don't bother posting the unload. The main reason for this is
1559 // that the jmethodID is a weak reference to the methodOop so if
1560 // it's being unloaded there's no way to look it up since the weak
1561 // ref will have been cleared.
1562 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) {
1563 assert(!unload_reported(), "already unloaded");
1564 JvmtiDeferredEvent event =
1565 JvmtiDeferredEvent::compiled_method_unload_event(this,
1566 _jmethod_id, insts_begin());
1567 if (SafepointSynchronize::is_at_safepoint()) {
1568 // Don't want to take the queueing lock. Add it as pending and
1569 // it will get enqueued later.
1570 JvmtiDeferredEventQueue::add_pending_event(event);
1571 } else {
1572 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1573 JvmtiDeferredEventQueue::enqueue(event);
1574 }
1575 }
1576
1577 // The JVMTI CompiledMethodUnload event can be enabled or disabled at
1578 // any time. As the nmethod is being unloaded now we mark it has
1579 // having the unload event reported - this will ensure that we don't
1580 // attempt to report the event in the unlikely scenario where the
1581 // event is enabled at the time the nmethod is made a zombie.
1582 set_unload_reported();
1583 }
1584
1585 // This is called at the end of the strong tracing/marking phase of a
1586 // GC to unload an nmethod if it contains otherwise unreachable
1587 // oops.
1588
1589 void nmethod::do_unloading(BoolObjectClosure* is_alive,
1590 OopClosure* keep_alive, bool unloading_occurred) {
1591 // Make sure the oop's ready to receive visitors
1592 assert(!is_zombie() && !is_unloaded(),
1593 "should not call follow on zombie or unloaded nmethod");
1594
1595 // If the method is not entrant then a JMP is plastered over the
1596 // first few bytes. If an oop in the old code was there, that oop
1597 // should not get GC'd. Skip the first few bytes of oops on
1598 // not-entrant methods.
1599 address low_boundary = verified_entry_point();
1600 if (is_not_entrant()) {
1601 low_boundary += NativeJump::instruction_size;
1602 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1603 // (See comment above.)
1604 }
1605
1606 // The RedefineClasses() API can cause the class unloading invariant
1607 // to no longer be true. See jvmtiExport.hpp for details.
1608 // Also, leave a debugging breadcrumb in local flag.
1609 bool a_class_was_redefined = JvmtiExport::has_redefined_a_class();
1610 if (a_class_was_redefined) {
1611 // This set of the unloading_occurred flag is done before the
1612 // call to post_compiled_method_unload() so that the unloading
1613 // of this nmethod is reported.
1614 unloading_occurred = true;
1615 }
1616
1617 // Follow methodOop
1618 if (can_unload(is_alive, keep_alive, (oop*)&_method, unloading_occurred)) {
1619 return;
1620 }
1621
1622 // Exception cache
1623 ExceptionCache* ec = exception_cache();
1624 while (ec != NULL) {
1625 oop* ex_addr = (oop*)ec->exception_type_addr();
1626 oop ex = *ex_addr;
1627 ExceptionCache* next_ec = ec->next();
1628 if (ex != NULL && !is_alive->do_object_b(ex)) {
1629 assert(!ex->is_compiledICHolder(), "Possible error here");
1630 remove_from_exception_cache(ec);
1631 }
1632 ec = next_ec;
1633 }
1634
1635 // If class unloading occurred we first iterate over all inline caches and
1636 // clear ICs where the cached oop is referring to an unloaded klass or method.
1637 // The remaining live cached oops will be traversed in the relocInfo::oop_type
1638 // iteration below.
1639 if (unloading_occurred) {
1640 RelocIterator iter(this, low_boundary);
1641 while(iter.next()) {
1642 if (iter.type() == relocInfo::virtual_call_type) {
1643 CompiledIC *ic = CompiledIC_at(iter.reloc());
1644 oop ic_oop = ic->cached_oop();
1645 if (ic_oop != NULL && !is_alive->do_object_b(ic_oop)) {
1646 // The only exception is compiledICHolder oops which may
1647 // yet be marked below. (We check this further below).
1648 if (ic_oop->is_compiledICHolder()) {
1649 compiledICHolderOop cichk_oop = compiledICHolderOop(ic_oop);
1650 if (is_alive->do_object_b(
1651 cichk_oop->holder_method()->method_holder()) &&
1652 is_alive->do_object_b(cichk_oop->holder_klass())) {
1653 continue;
1654 }
1655 }
1656 ic->set_to_clean();
1657 assert(ic->cached_oop() == NULL,
1658 "cached oop in IC should be cleared");
1659 }
1660 }
1661 }
1662 }
1663
1664 // Compiled code
1665 RelocIterator iter(this, low_boundary);
1666 while (iter.next()) {
1667 if (iter.type() == relocInfo::oop_type) {
1668 oop_Relocation* r = iter.oop_reloc();
1669 // In this loop, we must only traverse those oops directly embedded in
1670 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1671 assert(1 == (r->oop_is_immediate()) +
1672 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1673 "oop must be found in exactly one place");
1674 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1675 if (can_unload(is_alive, keep_alive, r->oop_addr(), unloading_occurred)) {
1676 return;
1677 }
1678 }
1679 }
1680 }
1681
1682
1683 // Scopes
1684 for (oop* p = oops_begin(); p < oops_end(); p++) {
1685 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1686 if (can_unload(is_alive, keep_alive, p, unloading_occurred)) {
1687 return;
1688 }
1689 }
1690
1691 #ifndef PRODUCT
1692 // This nmethod was not unloaded; check below that all CompiledICs
1693 // refer to marked oops.
1694 {
1695 RelocIterator iter(this, low_boundary);
1696 while (iter.next()) {
1697 if (iter.type() == relocInfo::virtual_call_type) {
1698 CompiledIC *ic = CompiledIC_at(iter.reloc());
1699 oop ic_oop = ic->cached_oop();
1700 assert(ic_oop == NULL || is_alive->do_object_b(ic_oop),
1701 "Found unmarked ic_oop in reachable nmethod");
1702 }
1703 }
1704 }
1705 #endif // !PRODUCT
1706 }
1707
1708 // This method is called twice during GC -- once while
1709 // tracing the "active" nmethods on thread stacks during
1710 // the (strong) marking phase, and then again when walking
1711 // the code cache contents during the weak roots processing
1712 // phase. The two uses are distinguished by means of the
1713 // 'do_strong_roots_only' flag, which is true in the first
1714 // case. We want to walk the weak roots in the nmethod
1715 // only in the second case. The weak roots in the nmethod
1716 // are the oops in the ExceptionCache and the InlineCache
1717 // oops.
1718 void nmethod::oops_do(OopClosure* f, bool do_strong_roots_only) {
1719 // make sure the oops ready to receive visitors
1720 assert(!is_zombie() && !is_unloaded(),
1721 "should not call follow on zombie or unloaded nmethod");
1722
1723 // If the method is not entrant or zombie then a JMP is plastered over the
1724 // first few bytes. If an oop in the old code was there, that oop
1725 // should not get GC'd. Skip the first few bytes of oops on
1726 // not-entrant methods.
1727 address low_boundary = verified_entry_point();
1728 if (is_not_entrant()) {
1729 low_boundary += NativeJump::instruction_size;
1730 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1731 // (See comment above.)
1732 }
1733
1734 // Compiled code
1735 f->do_oop((oop*) &_method);
1736 if (!do_strong_roots_only) {
1737 // weak roots processing phase -- update ExceptionCache oops
1738 ExceptionCache* ec = exception_cache();
1739 while(ec != NULL) {
1740 f->do_oop((oop*)ec->exception_type_addr());
1741 ec = ec->next();
1742 }
1743 } // Else strong roots phase -- skip oops in ExceptionCache
1744
1745 RelocIterator iter(this, low_boundary);
1746
1747 while (iter.next()) {
1748 if (iter.type() == relocInfo::oop_type ) {
1749 oop_Relocation* r = iter.oop_reloc();
1750 // In this loop, we must only follow those oops directly embedded in
1751 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1752 assert(1 == (r->oop_is_immediate()) +
1753 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1754 "oop must be found in exactly one place");
1755 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1756 f->do_oop(r->oop_addr());
1757 }
1758 }
1759 }
1760
1761 // Scopes
1762 // This includes oop constants not inlined in the code stream.
1763 for (oop* p = oops_begin(); p < oops_end(); p++) {
1764 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1765 f->do_oop(p);
1766 }
1767 }
1768
1769 #define NMETHOD_SENTINEL ((nmethod*)badAddress)
1770
1771 nmethod* volatile nmethod::_oops_do_mark_nmethods;
1772
1773 // An nmethod is "marked" if its _mark_link is set non-null.
1774 // Even if it is the end of the linked list, it will have a non-null link value,
1775 // as long as it is on the list.
1776 // This code must be MP safe, because it is used from parallel GC passes.
1777 bool nmethod::test_set_oops_do_mark() {
1778 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");
1779 nmethod* observed_mark_link = _oops_do_mark_link;
1780 if (observed_mark_link == NULL) {
1781 // Claim this nmethod for this thread to mark.
1782 observed_mark_link = (nmethod*)
1783 Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_link, NULL);
1784 if (observed_mark_link == NULL) {
1785
1786 // Atomically append this nmethod (now claimed) to the head of the list:
1787 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods;
1788 for (;;) {
1789 nmethod* required_mark_nmethods = observed_mark_nmethods;
1790 _oops_do_mark_link = required_mark_nmethods;
1791 observed_mark_nmethods = (nmethod*)
1792 Atomic::cmpxchg_ptr(this, &_oops_do_mark_nmethods, required_mark_nmethods);
1793 if (observed_mark_nmethods == required_mark_nmethods)
1794 break;
1795 }
1796 // Mark was clear when we first saw this guy.
1797 NOT_PRODUCT(if (TraceScavenge) print_on(tty, "oops_do, mark"));
1798 return false;
1799 }
1800 }
1801 // On fall through, another racing thread marked this nmethod before we did.
1802 return true;
1803 }
1804
1805 void nmethod::oops_do_marking_prologue() {
1806 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("[oops_do_marking_prologue"));
1807 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row");
1808 // We use cmpxchg_ptr instead of regular assignment here because the user
1809 // may fork a bunch of threads, and we need them all to see the same state.
1810 void* observed = Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, NULL);
1811 guarantee(observed == NULL, "no races in this sequential code");
1812 }
1813
1814 void nmethod::oops_do_marking_epilogue() {
1815 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row");
1816 nmethod* cur = _oops_do_mark_nmethods;
1817 while (cur != NMETHOD_SENTINEL) {
1818 assert(cur != NULL, "not NULL-terminated");
1819 nmethod* next = cur->_oops_do_mark_link;
1820 cur->_oops_do_mark_link = NULL;
1821 cur->fix_oop_relocations();
1822 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark"));
1823 cur = next;
1824 }
1825 void* required = _oops_do_mark_nmethods;
1826 void* observed = Atomic::cmpxchg_ptr(NULL, &_oops_do_mark_nmethods, required);
1827 guarantee(observed == required, "no races in this sequential code");
1828 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("oops_do_marking_epilogue]"));
1829 }
1830
1831 class DetectScavengeRoot: public OopClosure {
1832 bool _detected_scavenge_root;
1833 public:
1834 DetectScavengeRoot() : _detected_scavenge_root(false)
1835 { NOT_PRODUCT(_print_nm = NULL); }
1836 bool detected_scavenge_root() { return _detected_scavenge_root; }
1837 virtual void do_oop(oop* p) {
1838 if ((*p) != NULL && (*p)->is_scavengable()) {
1839 NOT_PRODUCT(maybe_print(p));
1840 _detected_scavenge_root = true;
1841 }
1842 }
1843 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
1844
1845 #ifndef PRODUCT
1846 nmethod* _print_nm;
1847 void maybe_print(oop* p) {
1848 if (_print_nm == NULL) return;
1849 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root");
1850 tty->print_cr(""PTR_FORMAT"[offset=%d] detected scavengable oop "PTR_FORMAT" (found at "PTR_FORMAT")",
1851 _print_nm, (int)((intptr_t)p - (intptr_t)_print_nm),
1852 (intptr_t)(*p), (intptr_t)p);
1853 (*p)->print();
1854 }
1855 #endif //PRODUCT
1856 };
1857
1858 bool nmethod::detect_scavenge_root_oops() {
1859 DetectScavengeRoot detect_scavenge_root;
1860 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this);
1861 oops_do(&detect_scavenge_root);
1862 return detect_scavenge_root.detected_scavenge_root();
1863 }
1864
1865 // Method that knows how to preserve outgoing arguments at call. This method must be
1866 // called with a frame corresponding to a Java invoke
1867 void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) {
1868 #ifndef SHARK
1869 if (!method()->is_native()) {
1870 SimpleScopeDesc ssd(this, fr.pc());
1871 Bytecode_invoke call(ssd.method(), ssd.bci());
1872 // compiled invokedynamic call sites have an implicit receiver at
1873 // resolution time, so make sure it gets GC'ed.
1874 bool has_receiver = !call.is_invokestatic();
1875 Symbol* signature = call.signature();
1876 fr.oops_compiled_arguments_do(signature, has_receiver, reg_map, f);
1877 }
1878 #endif // !SHARK
1879 }
1880
1881
1882 oop nmethod::embeddedOop_at(u_char* p) {
1883 RelocIterator iter(this, p, p + 1);
1884 while (iter.next())
1885 if (iter.type() == relocInfo::oop_type) {
1886 return iter.oop_reloc()->oop_value();
1887 }
1888 return NULL;
1889 }
1890
1891
1892 inline bool includes(void* p, void* from, void* to) {
1893 return from <= p && p < to;
1894 }
1895
1896
1897 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
1898 assert(count >= 2, "must be sentinel values, at least");
1899
1900 #ifdef ASSERT
1901 // must be sorted and unique; we do a binary search in find_pc_desc()
1902 int prev_offset = pcs[0].pc_offset();
1903 assert(prev_offset == PcDesc::lower_offset_limit,
1904 "must start with a sentinel");
1905 for (int i = 1; i < count; i++) {
1906 int this_offset = pcs[i].pc_offset();
1907 assert(this_offset > prev_offset, "offsets must be sorted");
1908 prev_offset = this_offset;
1909 }
1910 assert(prev_offset == PcDesc::upper_offset_limit,
1911 "must end with a sentinel");
1912 #endif //ASSERT
1913
1914 // Search for MethodHandle invokes and tag the nmethod.
1915 bool searching_method_handle = true;
1916 bool searching_profiled_call = false;
1917 COMPILER1_PRESENT(searching_profiled_call = searching_profiled_call || C1ProfileInlining);
1918 for (int i = 0; i < count; i++) {
1919 if (pcs[i].is_method_handle_invoke()) {
1920 set_has_method_handle_invokes(true);
1921 searching_method_handle = false;
1922 if (!searching_profiled_call) break;
1923 }
1924 if (pcs[i].is_profiled_call()) {
1925 set_has_profiled_calls(true);
1926 searching_profiled_call =false;
1927 if (!searching_method_handle) break;
1928 }
1929 }
1930 assert(has_method_handle_invokes() == (_deoptimize_mh_offset != -1), "must have deopt mh handler");
1931
1932 int size = count * sizeof(PcDesc);
1933 assert(scopes_pcs_size() >= size, "oob");
1934 memcpy(scopes_pcs_begin(), pcs, size);
1935
1936 // Adjust the final sentinel downward.
1937 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
1938 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
1939 last_pc->set_pc_offset(content_size() + 1);
1940 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
1941 // Fill any rounding gaps with copies of the last record.
1942 last_pc[1] = last_pc[0];
1943 }
1944 // The following assert could fail if sizeof(PcDesc) is not
1945 // an integral multiple of oopSize (the rounding term).
1946 // If it fails, change the logic to always allocate a multiple
1947 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
1948 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
1949 }
1950
1951 void nmethod::copy_scopes_data(u_char* buffer, int size) {
1952 assert(scopes_data_size() >= size, "oob");
1953 memcpy(scopes_data_begin(), buffer, size);
1954 }
1955
1956
1957 #ifdef ASSERT
1958 static PcDesc* linear_search(nmethod* nm, int pc_offset, bool approximate) {
1959 PcDesc* lower = nm->scopes_pcs_begin();
1960 PcDesc* upper = nm->scopes_pcs_end();
1961 lower += 1; // exclude initial sentinel
1962 PcDesc* res = NULL;
1963 for (PcDesc* p = lower; p < upper; p++) {
1964 NOT_PRODUCT(--nmethod_stats.pc_desc_tests); // don't count this call to match_desc
1965 if (match_desc(p, pc_offset, approximate)) {
1966 if (res == NULL)
1967 res = p;
1968 else
1969 res = (PcDesc*) badAddress;
1970 }
1971 }
1972 return res;
1973 }
1974 #endif
1975
1976
1977 // Finds a PcDesc with real-pc equal to "pc"
1978 PcDesc* nmethod::find_pc_desc_internal(address pc, bool approximate) {
1979 address base_address = code_begin();
1980 if ((pc < base_address) ||
1981 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
1982 return NULL; // PC is wildly out of range
1983 }
1984 int pc_offset = (int) (pc - base_address);
1985
1986 // Check the PcDesc cache if it contains the desired PcDesc
1987 // (This as an almost 100% hit rate.)
1988 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
1989 if (res != NULL) {
1990 assert(res == linear_search(this, pc_offset, approximate), "cache ok");
1991 return res;
1992 }
1993
1994 // Fallback algorithm: quasi-linear search for the PcDesc
1995 // Find the last pc_offset less than the given offset.
1996 // The successor must be the required match, if there is a match at all.
1997 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
1998 PcDesc* lower = scopes_pcs_begin();
1999 PcDesc* upper = scopes_pcs_end();
2000 upper -= 1; // exclude final sentinel
2001 if (lower >= upper) return NULL; // native method; no PcDescs at all
2002
2003 #define assert_LU_OK \
2004 /* invariant on lower..upper during the following search: */ \
2005 assert(lower->pc_offset() < pc_offset, "sanity"); \
2006 assert(upper->pc_offset() >= pc_offset, "sanity")
2007 assert_LU_OK;
2008
2009 // Use the last successful return as a split point.
2010 PcDesc* mid = _pc_desc_cache.last_pc_desc();
2011 NOT_PRODUCT(++nmethod_stats.pc_desc_searches);
2012 if (mid->pc_offset() < pc_offset) {
2013 lower = mid;
2014 } else {
2015 upper = mid;
2016 }
2017
2018 // Take giant steps at first (4096, then 256, then 16, then 1)
2019 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
2020 const int RADIX = (1 << LOG2_RADIX);
2021 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
2022 while ((mid = lower + step) < upper) {
2023 assert_LU_OK;
2024 NOT_PRODUCT(++nmethod_stats.pc_desc_searches);
2025 if (mid->pc_offset() < pc_offset) {
2026 lower = mid;
2027 } else {
2028 upper = mid;
2029 break;
2030 }
2031 }
2032 assert_LU_OK;
2033 }
2034
2035 // Sneak up on the value with a linear search of length ~16.
2036 while (true) {
2037 assert_LU_OK;
2038 mid = lower + 1;
2039 NOT_PRODUCT(++nmethod_stats.pc_desc_searches);
2040 if (mid->pc_offset() < pc_offset) {
2041 lower = mid;
2042 } else {
2043 upper = mid;
2044 break;
2045 }
2046 }
2047 #undef assert_LU_OK
2048
2049 if (match_desc(upper, pc_offset, approximate)) {
2050 assert(upper == linear_search(this, pc_offset, approximate), "search ok");
2051 _pc_desc_cache.add_pc_desc(upper);
2052 return upper;
2053 } else {
2054 assert(NULL == linear_search(this, pc_offset, approximate), "search ok");
2055 return NULL;
2056 }
2057 }
2058
2059
2060 bool nmethod::check_all_dependencies() {
2061 bool found_check = false;
2062 // wholesale check of all dependencies
2063 for (Dependencies::DepStream deps(this); deps.next(); ) {
2064 if (deps.check_dependency() != NULL) {
2065 found_check = true;
2066 NOT_DEBUG(break);
2067 }
2068 }
2069 return found_check; // tell caller if we found anything
2070 }
2071
2072 bool nmethod::check_dependency_on(DepChange& changes) {
2073 // What has happened:
2074 // 1) a new class dependee has been added
2075 // 2) dependee and all its super classes have been marked
2076 bool found_check = false; // set true if we are upset
2077 for (Dependencies::DepStream deps(this); deps.next(); ) {
2078 // Evaluate only relevant dependencies.
2079 if (deps.spot_check_dependency_at(changes) != NULL) {
2080 found_check = true;
2081 NOT_DEBUG(break);
2082 }
2083 }
2084 return found_check;
2085 }
2086
2087 bool nmethod::is_evol_dependent_on(klassOop dependee) {
2088 instanceKlass *dependee_ik = instanceKlass::cast(dependee);
2089 objArrayOop dependee_methods = dependee_ik->methods();
2090 for (Dependencies::DepStream deps(this); deps.next(); ) {
2091 if (deps.type() == Dependencies::evol_method) {
2092 methodOop method = deps.method_argument(0);
2093 for (int j = 0; j < dependee_methods->length(); j++) {
2094 if ((methodOop) dependee_methods->obj_at(j) == method) {
2095 // RC_TRACE macro has an embedded ResourceMark
2096 RC_TRACE(0x01000000,
2097 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)",
2098 _method->method_holder()->klass_part()->external_name(),
2099 _method->name()->as_C_string(),
2100 _method->signature()->as_C_string(), compile_id(),
2101 method->method_holder()->klass_part()->external_name(),
2102 method->name()->as_C_string(),
2103 method->signature()->as_C_string()));
2104 if (TraceDependencies || LogCompilation)
2105 deps.log_dependency(dependee);
2106 return true;
2107 }
2108 }
2109 }
2110 }
2111 return false;
2112 }
2113
2114 // Called from mark_for_deoptimization, when dependee is invalidated.
2115 bool nmethod::is_dependent_on_method(methodOop dependee) {
2116 for (Dependencies::DepStream deps(this); deps.next(); ) {
2117 if (deps.type() != Dependencies::evol_method)
2118 continue;
2119 methodOop method = deps.method_argument(0);
2120 if (method == dependee) return true;
2121 }
2122 return false;
2123 }
2124
2125
2126 bool nmethod::is_patchable_at(address instr_addr) {
2127 assert(insts_contains(instr_addr), "wrong nmethod used");
2128 if (is_zombie()) {
2129 // a zombie may never be patched
2130 return false;
2131 }
2132 return true;
2133 }
2134
2135
2136 address nmethod::continuation_for_implicit_exception(address pc) {
2137 // Exception happened outside inline-cache check code => we are inside
2138 // an active nmethod => use cpc to determine a return address
2139 int exception_offset = pc - code_begin();
2140 int cont_offset = ImplicitExceptionTable(this).at( exception_offset );
2141 #ifdef ASSERT
2142 if (cont_offset == 0) {
2143 Thread* thread = ThreadLocalStorage::get_thread_slow();
2144 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
2145 HandleMark hm(thread);
2146 ResourceMark rm(thread);
2147 CodeBlob* cb = CodeCache::find_blob(pc);
2148 assert(cb != NULL && cb == this, "");
2149 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, pc);
2150 print();
2151 method()->print_codes();
2152 print_code();
2153 print_pcs();
2154 }
2155 #endif
2156 if (cont_offset == 0) {
2157 // Let the normal error handling report the exception
2158 return NULL;
2159 }
2160 return code_begin() + cont_offset;
2161 }
2162
2163
2164
2165 void nmethod_init() {
2166 // make sure you didn't forget to adjust the filler fields
2167 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
2168 }
2169
2170
2171 //-------------------------------------------------------------------------------------------
2172
2173
2174 // QQQ might we make this work from a frame??
2175 nmethodLocker::nmethodLocker(address pc) {
2176 CodeBlob* cb = CodeCache::find_blob(pc);
2177 guarantee(cb != NULL && cb->is_nmethod(), "bad pc for a nmethod found");
2178 _nm = (nmethod*)cb;
2179 lock_nmethod(_nm);
2180 }
2181
2182 // Only JvmtiDeferredEvent::compiled_method_unload_event()
2183 // should pass zombie_ok == true.
2184 void nmethodLocker::lock_nmethod(nmethod* nm, bool zombie_ok) {
2185 if (nm == NULL) return;
2186 Atomic::inc(&nm->_lock_count);
2187 guarantee(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method");
2188 }
2189
2190 void nmethodLocker::unlock_nmethod(nmethod* nm) {
2191 if (nm == NULL) return;
2192 Atomic::dec(&nm->_lock_count);
2193 guarantee(nm->_lock_count >= 0, "unmatched nmethod lock/unlock");
2194 }
2195
2196
2197 // -----------------------------------------------------------------------------
2198 // nmethod::get_deopt_original_pc
2199 //
2200 // Return the original PC for the given PC if:
2201 // (a) the given PC belongs to a nmethod and
2202 // (b) it is a deopt PC
2203 address nmethod::get_deopt_original_pc(const frame* fr) {
2204 if (fr->cb() == NULL) return NULL;
2205
2206 nmethod* nm = fr->cb()->as_nmethod_or_null();
2207 if (nm != NULL && nm->is_deopt_pc(fr->pc()))
2208 return nm->get_original_pc(fr);
2209
2210 return NULL;
2211 }
2212
2213
2214 // -----------------------------------------------------------------------------
2215 // MethodHandle
2216
2217 bool nmethod::is_method_handle_return(address return_pc) {
2218 if (!has_method_handle_invokes()) return false;
2219 PcDesc* pd = pc_desc_at(return_pc);
2220 if (pd == NULL)
2221 return false;
2222 return pd->is_method_handle_invoke();
2223 }
2224
2225 bool nmethod::is_profiled_call(address call_pc) {
2226 if (!has_profiled_calls()) return false;
2227 PcDesc* pd = pc_desc_at(call_pc);
2228 if (pd == NULL)
2229 return false;
2230 return pd->is_profiled_call();
2231 }
2232
2233
2234 // -----------------------------------------------------------------------------
2235 // Verification
2236
2237 class VerifyOopsClosure: public OopClosure {
2238 nmethod* _nm;
2239 bool _ok;
2240 public:
2241 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
2242 bool ok() { return _ok; }
2243 virtual void do_oop(oop* p) {
2244 if ((*p) == NULL || (*p)->is_oop()) return;
2245 if (_ok) {
2246 _nm->print_nmethod(true);
2247 _ok = false;
2248 }
2249 tty->print_cr("*** non-oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)",
2250 (intptr_t)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm));
2251 }
2252 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2253 };
2254
2255 void nmethod::verify() {
2256
2257 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant
2258 // seems odd.
2259
2260 if( is_zombie() || is_not_entrant() )
2261 return;
2262
2263 // Make sure all the entry points are correctly aligned for patching.
2264 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
2265
2266 assert(method()->is_oop(), "must be valid");
2267
2268 ResourceMark rm;
2269
2270 if (!CodeCache::contains(this)) {
2271 fatal(err_msg("nmethod at " INTPTR_FORMAT " not in zone", this));
2272 }
2273
2274 if(is_native_method() )
2275 return;
2276
2277 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
2278 if (nm != this) {
2279 fatal(err_msg("findNMethod did not find this nmethod (" INTPTR_FORMAT ")",
2280 this));
2281 }
2282
2283 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2284 if (! p->verify(this)) {
2285 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", this);
2286 }
2287 }
2288
2289 VerifyOopsClosure voc(this);
2290 oops_do(&voc);
2291 assert(voc.ok(), "embedded oops must be OK");
2292 verify_scavenge_root_oops();
2293
2294 verify_scopes();
2295 }
2296
2297
2298 void nmethod::verify_interrupt_point(address call_site) {
2299 // This code does not work in release mode since
2300 // owns_lock only is available in debug mode.
2301 CompiledIC* ic = NULL;
2302 Thread *cur = Thread::current();
2303 if (CompiledIC_lock->owner() == cur ||
2304 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) &&
2305 SafepointSynchronize::is_at_safepoint())) {
2306 ic = CompiledIC_at(call_site);
2307 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
2308 } else {
2309 MutexLocker ml_verify (CompiledIC_lock);
2310 ic = CompiledIC_at(call_site);
2311 }
2312 PcDesc* pd = pc_desc_at(ic->end_of_call());
2313 assert(pd != NULL, "PcDesc must exist");
2314 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(),
2315 pd->obj_decode_offset(), pd->should_reexecute(),
2316 pd->return_oop());
2317 !sd->is_top(); sd = sd->sender()) {
2318 sd->verify();
2319 }
2320 }
2321
2322 void nmethod::verify_scopes() {
2323 if( !method() ) return; // Runtime stubs have no scope
2324 if (method()->is_native()) return; // Ignore stub methods.
2325 // iterate through all interrupt point
2326 // and verify the debug information is valid.
2327 RelocIterator iter((nmethod*)this);
2328 while (iter.next()) {
2329 address stub = NULL;
2330 switch (iter.type()) {
2331 case relocInfo::virtual_call_type:
2332 verify_interrupt_point(iter.addr());
2333 break;
2334 case relocInfo::opt_virtual_call_type:
2335 stub = iter.opt_virtual_call_reloc()->static_stub();
2336 verify_interrupt_point(iter.addr());
2337 break;
2338 case relocInfo::static_call_type:
2339 stub = iter.static_call_reloc()->static_stub();
2340 //verify_interrupt_point(iter.addr());
2341 break;
2342 case relocInfo::runtime_call_type:
2343 address destination = iter.reloc()->value();
2344 // Right now there is no way to find out which entries support
2345 // an interrupt point. It would be nice if we had this
2346 // information in a table.
2347 break;
2348 }
2349 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section");
2350 }
2351 }
2352
2353
2354 // -----------------------------------------------------------------------------
2355 // Non-product code
2356 #ifndef PRODUCT
2357
2358 class DebugScavengeRoot: public OopClosure {
2359 nmethod* _nm;
2360 bool _ok;
2361 public:
2362 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { }
2363 bool ok() { return _ok; }
2364 virtual void do_oop(oop* p) {
2365 if ((*p) == NULL || !(*p)->is_scavengable()) return;
2366 if (_ok) {
2367 _nm->print_nmethod(true);
2368 _ok = false;
2369 }
2370 tty->print_cr("*** scavengable oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)",
2371 (intptr_t)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm));
2372 (*p)->print();
2373 }
2374 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2375 };
2376
2377 void nmethod::verify_scavenge_root_oops() {
2378 if (!on_scavenge_root_list()) {
2379 // Actually look inside, to verify the claim that it's clean.
2380 DebugScavengeRoot debug_scavenge_root(this);
2381 oops_do(&debug_scavenge_root);
2382 if (!debug_scavenge_root.ok())
2383 fatal("found an unadvertised bad scavengable oop in the code cache");
2384 }
2385 assert(scavenge_root_not_marked(), "");
2386 }
2387
2388 #endif // PRODUCT
2389
2390 // Printing operations
2391
2392 void nmethod::print() const {
2393 ResourceMark rm;
2394 ttyLocker ttyl; // keep the following output all in one block
2395
2396 tty->print("Compiled method ");
2397
2398 if (is_compiled_by_c1()) {
2399 tty->print("(c1) ");
2400 } else if (is_compiled_by_c2()) {
2401 tty->print("(c2) ");
2402 } else if (is_compiled_by_shark()) {
2403 tty->print("(shark) ");
2404 } else {
2405 tty->print("(nm) ");
2406 }
2407
2408 print_on(tty, NULL);
2409
2410 if (WizardMode) {
2411 tty->print("((nmethod*) "INTPTR_FORMAT ") ", this);
2412 tty->print(" for method " INTPTR_FORMAT , (address)method());
2413 tty->print(" { ");
2414 if (is_in_use()) tty->print("in_use ");
2415 if (is_not_entrant()) tty->print("not_entrant ");
2416 if (is_zombie()) tty->print("zombie ");
2417 if (is_unloaded()) tty->print("unloaded ");
2418 if (on_scavenge_root_list()) tty->print("scavenge_root ");
2419 tty->print_cr("}:");
2420 }
2421 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2422 (address)this,
2423 (address)this + size(),
2424 size());
2425 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2426 relocation_begin(),
2427 relocation_end(),
2428 relocation_size());
2429 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2430 consts_begin(),
2431 consts_end(),
2432 consts_size());
2433 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2434 insts_begin(),
2435 insts_end(),
2436 insts_size());
2437 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2438 stub_begin(),
2439 stub_end(),
2440 stub_size());
2441 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2442 oops_begin(),
2443 oops_end(),
2444 oops_size());
2445 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2446 scopes_data_begin(),
2447 scopes_data_end(),
2448 scopes_data_size());
2449 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2450 scopes_pcs_begin(),
2451 scopes_pcs_end(),
2452 scopes_pcs_size());
2453 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2454 dependencies_begin(),
2455 dependencies_end(),
2456 dependencies_size());
2457 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2458 handler_table_begin(),
2459 handler_table_end(),
2460 handler_table_size());
2461 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2462 nul_chk_table_begin(),
2463 nul_chk_table_end(),
2464 nul_chk_table_size());
2465 }
2466
2467 void nmethod::print_code() {
2468 HandleMark hm;
2469 ResourceMark m;
2470 Disassembler::decode(this);
2471 }
2472
2473
2474 #ifndef PRODUCT
2475
2476 void nmethod::print_scopes() {
2477 // Find the first pc desc for all scopes in the code and print it.
2478 ResourceMark rm;
2479 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2480 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
2481 continue;
2482
2483 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
2484 sd->print_on(tty, p);
2485 }
2486 }
2487
2488 void nmethod::print_dependencies() {
2489 ResourceMark rm;
2490 ttyLocker ttyl; // keep the following output all in one block
2491 tty->print_cr("Dependencies:");
2492 for (Dependencies::DepStream deps(this); deps.next(); ) {
2493 deps.print_dependency();
2494 klassOop ctxk = deps.context_type();
2495 if (ctxk != NULL) {
2496 Klass* k = Klass::cast(ctxk);
2497 if (k->oop_is_instance() && ((instanceKlass*)k)->is_dependent_nmethod(this)) {
2498 tty->print_cr(" [nmethod<=klass]%s", k->external_name());
2499 }
2500 }
2501 deps.log_dependency(); // put it into the xml log also
2502 }
2503 }
2504
2505
2506 void nmethod::print_relocations() {
2507 ResourceMark m; // in case methods get printed via the debugger
2508 tty->print_cr("relocations:");
2509 RelocIterator iter(this);
2510 iter.print();
2511 if (UseRelocIndex) {
2512 jint* index_end = (jint*)relocation_end() - 1;
2513 jint index_size = *index_end;
2514 jint* index_start = (jint*)( (address)index_end - index_size );
2515 tty->print_cr(" index @" INTPTR_FORMAT ": index_size=%d", index_start, index_size);
2516 if (index_size > 0) {
2517 jint* ip;
2518 for (ip = index_start; ip+2 <= index_end; ip += 2)
2519 tty->print_cr(" (%d %d) addr=" INTPTR_FORMAT " @" INTPTR_FORMAT,
2520 ip[0],
2521 ip[1],
2522 header_end()+ip[0],
2523 relocation_begin()-1+ip[1]);
2524 for (; ip < index_end; ip++)
2525 tty->print_cr(" (%d ?)", ip[0]);
2526 tty->print_cr(" @" INTPTR_FORMAT ": index_size=%d", ip, *ip++);
2527 tty->print_cr("reloc_end @" INTPTR_FORMAT ":", ip);
2528 }
2529 }
2530 }
2531
2532
2533 void nmethod::print_pcs() {
2534 ResourceMark m; // in case methods get printed via debugger
2535 tty->print_cr("pc-bytecode offsets:");
2536 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2537 p->print(this);
2538 }
2539 }
2540
2541 #endif // PRODUCT
2542
2543 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
2544 RelocIterator iter(this, begin, end);
2545 bool have_one = false;
2546 while (iter.next()) {
2547 have_one = true;
2548 switch (iter.type()) {
2549 case relocInfo::none: return "no_reloc";
2550 case relocInfo::oop_type: {
2551 stringStream st;
2552 oop_Relocation* r = iter.oop_reloc();
2553 oop obj = r->oop_value();
2554 st.print("oop(");
2555 if (obj == NULL) st.print("NULL");
2556 else obj->print_value_on(&st);
2557 st.print(")");
2558 return st.as_string();
2559 }
2560 case relocInfo::virtual_call_type: return "virtual_call";
2561 case relocInfo::opt_virtual_call_type: return "optimized virtual_call";
2562 case relocInfo::static_call_type: return "static_call";
2563 case relocInfo::static_stub_type: return "static_stub";
2564 case relocInfo::runtime_call_type: return "runtime_call";
2565 case relocInfo::external_word_type: return "external_word";
2566 case relocInfo::internal_word_type: return "internal_word";
2567 case relocInfo::section_word_type: return "section_word";
2568 case relocInfo::poll_type: return "poll";
2569 case relocInfo::poll_return_type: return "poll_return";
2570 case relocInfo::type_mask: return "type_bit_mask";
2571 }
2572 }
2573 return have_one ? "other" : NULL;
2574 }
2575
2576 // Return a the last scope in (begin..end]
2577 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
2578 PcDesc* p = pc_desc_near(begin+1);
2579 if (p != NULL && p->real_pc(this) <= end) {
2580 return new ScopeDesc(this, p->scope_decode_offset(),
2581 p->obj_decode_offset(), p->should_reexecute(),
2582 p->return_oop());
2583 }
2584 return NULL;
2585 }
2586
2587 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) {
2588 if (block_begin == entry_point()) stream->print_cr("[Entry Point]");
2589 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]");
2590 if (block_begin == exception_begin()) stream->print_cr("[Exception Handler]");
2591 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]");
2592 if (block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]");
2593
2594 if (has_method_handle_invokes())
2595 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]");
2596
2597 if (block_begin == consts_begin()) stream->print_cr("[Constants]");
2598
2599 if (block_begin == entry_point()) {
2600 methodHandle m = method();
2601 if (m.not_null()) {
2602 stream->print(" # ");
2603 m->print_value_on(stream);
2604 stream->cr();
2605 }
2606 if (m.not_null() && !is_osr_method()) {
2607 ResourceMark rm;
2608 int sizeargs = m->size_of_parameters();
2609 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
2610 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
2611 {
2612 int sig_index = 0;
2613 if (!m->is_static())
2614 sig_bt[sig_index++] = T_OBJECT; // 'this'
2615 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) {
2616 BasicType t = ss.type();
2617 sig_bt[sig_index++] = t;
2618 if (type2size[t] == 2) {
2619 sig_bt[sig_index++] = T_VOID;
2620 } else {
2621 assert(type2size[t] == 1, "size is 1 or 2");
2622 }
2623 }
2624 assert(sig_index == sizeargs, "");
2625 }
2626 const char* spname = "sp"; // make arch-specific?
2627 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false);
2628 int stack_slot_offset = this->frame_size() * wordSize;
2629 int tab1 = 14, tab2 = 24;
2630 int sig_index = 0;
2631 int arg_index = (m->is_static() ? 0 : -1);
2632 bool did_old_sp = false;
2633 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) {
2634 bool at_this = (arg_index == -1);
2635 bool at_old_sp = false;
2636 BasicType t = (at_this ? T_OBJECT : ss.type());
2637 assert(t == sig_bt[sig_index], "sigs in sync");
2638 if (at_this)
2639 stream->print(" # this: ");
2640 else
2641 stream->print(" # parm%d: ", arg_index);
2642 stream->move_to(tab1);
2643 VMReg fst = regs[sig_index].first();
2644 VMReg snd = regs[sig_index].second();
2645 if (fst->is_reg()) {
2646 stream->print("%s", fst->name());
2647 if (snd->is_valid()) {
2648 stream->print(":%s", snd->name());
2649 }
2650 } else if (fst->is_stack()) {
2651 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
2652 if (offset == stack_slot_offset) at_old_sp = true;
2653 stream->print("[%s+0x%x]", spname, offset);
2654 } else {
2655 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
2656 }
2657 stream->print(" ");
2658 stream->move_to(tab2);
2659 stream->print("= ");
2660 if (at_this) {
2661 m->method_holder()->print_value_on(stream);
2662 } else {
2663 bool did_name = false;
2664 if (!at_this && ss.is_object()) {
2665 Symbol* name = ss.as_symbol_or_null();
2666 if (name != NULL) {
2667 name->print_value_on(stream);
2668 did_name = true;
2669 }
2670 }
2671 if (!did_name)
2672 stream->print("%s", type2name(t));
2673 }
2674 if (at_old_sp) {
2675 stream->print(" (%s of caller)", spname);
2676 did_old_sp = true;
2677 }
2678 stream->cr();
2679 sig_index += type2size[t];
2680 arg_index += 1;
2681 if (!at_this) ss.next();
2682 }
2683 if (!did_old_sp) {
2684 stream->print(" # ");
2685 stream->move_to(tab1);
2686 stream->print("[%s+0x%x]", spname, stack_slot_offset);
2687 stream->print(" (%s of caller)", spname);
2688 stream->cr();
2689 }
2690 }
2691 }
2692 }
2693
2694 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) {
2695 // First, find an oopmap in (begin, end].
2696 // We use the odd half-closed interval so that oop maps and scope descs
2697 // which are tied to the byte after a call are printed with the call itself.
2698 address base = code_begin();
2699 OopMapSet* oms = oop_maps();
2700 if (oms != NULL) {
2701 for (int i = 0, imax = oms->size(); i < imax; i++) {
2702 OopMap* om = oms->at(i);
2703 address pc = base + om->offset();
2704 if (pc > begin) {
2705 if (pc <= end) {
2706 st->move_to(column);
2707 st->print("; ");
2708 om->print_on(st);
2709 }
2710 break;
2711 }
2712 }
2713 }
2714
2715 // Print any debug info present at this pc.
2716 ScopeDesc* sd = scope_desc_in(begin, end);
2717 if (sd != NULL) {
2718 st->move_to(column);
2719 if (sd->bci() == SynchronizationEntryBCI) {
2720 st->print(";*synchronization entry");
2721 } else {
2722 if (sd->method().is_null()) {
2723 st->print("method is NULL");
2724 } else if (sd->method()->is_native()) {
2725 st->print("method is native");
2726 } else {
2727 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci());
2728 st->print(";*%s", Bytecodes::name(bc));
2729 switch (bc) {
2730 case Bytecodes::_invokevirtual:
2731 case Bytecodes::_invokespecial:
2732 case Bytecodes::_invokestatic:
2733 case Bytecodes::_invokeinterface:
2734 {
2735 Bytecode_invoke invoke(sd->method(), sd->bci());
2736 st->print(" ");
2737 if (invoke.name() != NULL)
2738 invoke.name()->print_symbol_on(st);
2739 else
2740 st->print("<UNKNOWN>");
2741 break;
2742 }
2743 case Bytecodes::_getfield:
2744 case Bytecodes::_putfield:
2745 case Bytecodes::_getstatic:
2746 case Bytecodes::_putstatic:
2747 {
2748 Bytecode_field field(sd->method(), sd->bci());
2749 st->print(" ");
2750 if (field.name() != NULL)
2751 field.name()->print_symbol_on(st);
2752 else
2753 st->print("<UNKNOWN>");
2754 }
2755 }
2756 }
2757 }
2758
2759 // Print all scopes
2760 for (;sd != NULL; sd = sd->sender()) {
2761 st->move_to(column);
2762 st->print("; -");
2763 if (sd->method().is_null()) {
2764 st->print("method is NULL");
2765 } else {
2766 sd->method()->print_short_name(st);
2767 }
2768 int lineno = sd->method()->line_number_from_bci(sd->bci());
2769 if (lineno != -1) {
2770 st->print("@%d (line %d)", sd->bci(), lineno);
2771 } else {
2772 st->print("@%d", sd->bci());
2773 }
2774 st->cr();
2775 }
2776 }
2777
2778 // Print relocation information
2779 const char* str = reloc_string_for(begin, end);
2780 if (str != NULL) {
2781 if (sd != NULL) st->cr();
2782 st->move_to(column);
2783 st->print("; {%s}", str);
2784 }
2785 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin());
2786 if (cont_offset != 0) {
2787 st->move_to(column);
2788 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, code_begin() + cont_offset);
2789 }
2790
2791 }
2792
2793 #ifndef PRODUCT
2794
2795 void nmethod::print_value_on(outputStream* st) const {
2796 st->print("nmethod");
2797 print_on(st, NULL);
2798 }
2799
2800 void nmethod::print_calls(outputStream* st) {
2801 RelocIterator iter(this);
2802 while (iter.next()) {
2803 switch (iter.type()) {
2804 case relocInfo::virtual_call_type:
2805 case relocInfo::opt_virtual_call_type: {
2806 VerifyMutexLocker mc(CompiledIC_lock);
2807 CompiledIC_at(iter.reloc())->print();
2808 break;
2809 }
2810 case relocInfo::static_call_type:
2811 st->print_cr("Static call at " INTPTR_FORMAT, iter.reloc()->addr());
2812 compiledStaticCall_at(iter.reloc())->print();
2813 break;
2814 }
2815 }
2816 }
2817
2818 void nmethod::print_handler_table() {
2819 ExceptionHandlerTable(this).print();
2820 }
2821
2822 void nmethod::print_nul_chk_table() {
2823 ImplicitExceptionTable(this).print(code_begin());
2824 }
2825
2826 void nmethod::print_statistics() {
2827 ttyLocker ttyl;
2828 if (xtty != NULL) xtty->head("statistics type='nmethod'");
2829 nmethod_stats.print_native_nmethod_stats();
2830 nmethod_stats.print_nmethod_stats();
2831 DebugInformationRecorder::print_statistics();
2832 nmethod_stats.print_pc_stats();
2833 Dependencies::print_statistics();
2834 if (xtty != NULL) xtty->tail("statistics");
2835 }
2836
2837 #endif // PRODUCT