1 /*
2 * Copyright 1997-2009 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 # include "incls/_precompiled.incl"
26 # include "incls/_nmethod.cpp.incl"
27
28 #ifdef DTRACE_ENABLED
29
30 // Only bother with this argument setup if dtrace is available
31
32 HS_DTRACE_PROBE_DECL8(hotspot, compiled__method__load,
33 const char*, int, const char*, int, const char*, int, void*, size_t);
34
35 HS_DTRACE_PROBE_DECL6(hotspot, compiled__method__unload,
36 char*, int, char*, int, char*, int);
37
38 #define DTRACE_METHOD_UNLOAD_PROBE(method) \
39 { \
40 methodOop m = (method); \
41 if (m != NULL) { \
42 symbolOop klass_name = m->klass_name(); \
43 symbolOop name = m->name(); \
44 symbolOop signature = m->signature(); \
45 HS_DTRACE_PROBE6(hotspot, compiled__method__unload, \
46 klass_name->bytes(), klass_name->utf8_length(), \
47 name->bytes(), name->utf8_length(), \
48 signature->bytes(), signature->utf8_length()); \
49 } \
50 }
51
52 #else // ndef DTRACE_ENABLED
53
54 #define DTRACE_METHOD_UNLOAD_PROBE(method)
55
56 #endif
57
58 bool nmethod::is_compiled_by_c1() const {
59 if (is_native_method()) return false;
60 assert(compiler() != NULL, "must be");
61 return compiler()->is_c1();
62 }
63 bool nmethod::is_compiled_by_c2() const {
64 if (is_native_method()) return false;
65 assert(compiler() != NULL, "must be");
66 return compiler()->is_c2();
67 }
68
69
70
71 //---------------------------------------------------------------------------------
72 // NMethod statistics
73 // They are printed under various flags, including:
74 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation.
75 // (In the latter two cases, they like other stats are printed to the log only.)
76
77 #ifndef PRODUCT
78 // These variables are put into one block to reduce relocations
79 // and make it simpler to print from the debugger.
80 static
81 struct nmethod_stats_struct {
82 int nmethod_count;
83 int total_size;
84 int relocation_size;
85 int code_size;
86 int stub_size;
87 int consts_size;
88 int scopes_data_size;
89 int scopes_pcs_size;
90 int dependencies_size;
91 int handler_table_size;
92 int nul_chk_table_size;
93 int oops_size;
94
95 void note_nmethod(nmethod* nm) {
96 nmethod_count += 1;
97 total_size += nm->size();
98 relocation_size += nm->relocation_size();
99 code_size += nm->code_size();
100 stub_size += nm->stub_size();
101 consts_size += nm->consts_size();
102 scopes_data_size += nm->scopes_data_size();
103 scopes_pcs_size += nm->scopes_pcs_size();
104 dependencies_size += nm->dependencies_size();
105 handler_table_size += nm->handler_table_size();
106 nul_chk_table_size += nm->nul_chk_table_size();
107 oops_size += nm->oops_size();
108 }
109 void print_nmethod_stats() {
110 if (nmethod_count == 0) return;
111 tty->print_cr("Statistics for %d bytecoded nmethods:", nmethod_count);
112 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size);
113 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size);
114 if (code_size != 0) tty->print_cr(" main code = %d", code_size);
115 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size);
116 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size);
117 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size);
118 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size);
119 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size);
120 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size);
121 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size);
122 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size);
123 }
124
125 int native_nmethod_count;
126 int native_total_size;
127 int native_relocation_size;
128 int native_code_size;
129 int native_oops_size;
130 void note_native_nmethod(nmethod* nm) {
131 native_nmethod_count += 1;
132 native_total_size += nm->size();
133 native_relocation_size += nm->relocation_size();
134 native_code_size += nm->code_size();
135 native_oops_size += nm->oops_size();
136 }
137 void print_native_nmethod_stats() {
138 if (native_nmethod_count == 0) return;
139 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count);
140 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size);
141 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size);
142 if (native_code_size != 0) tty->print_cr(" N. main code = %d", native_code_size);
143 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size);
144 }
145
146 int pc_desc_resets; // number of resets (= number of caches)
147 int pc_desc_queries; // queries to nmethod::find_pc_desc
148 int pc_desc_approx; // number of those which have approximate true
149 int pc_desc_repeats; // number of _last_pc_desc hits
150 int pc_desc_hits; // number of LRU cache hits
151 int pc_desc_tests; // total number of PcDesc examinations
152 int pc_desc_searches; // total number of quasi-binary search steps
153 int pc_desc_adds; // number of LUR cache insertions
154
155 void print_pc_stats() {
156 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query",
157 pc_desc_queries,
158 (double)(pc_desc_tests + pc_desc_searches)
159 / pc_desc_queries);
160 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d",
161 pc_desc_resets,
162 pc_desc_queries, pc_desc_approx,
163 pc_desc_repeats, pc_desc_hits,
164 pc_desc_tests, pc_desc_searches, pc_desc_adds);
165 }
166 } nmethod_stats;
167 #endif //PRODUCT
168
169 //---------------------------------------------------------------------------------
170
171
172 // The _unwind_handler is a special marker address, which says that
173 // for given exception oop and address, the frame should be removed
174 // as the tuple cannot be caught in the nmethod
175 address ExceptionCache::_unwind_handler = (address) -1;
176
177
178 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) {
179 assert(pc != NULL, "Must be non null");
180 assert(exception.not_null(), "Must be non null");
181 assert(handler != NULL, "Must be non null");
182
183 _count = 0;
184 _exception_type = exception->klass();
185 _next = NULL;
186
187 add_address_and_handler(pc,handler);
188 }
189
190
191 address ExceptionCache::match(Handle exception, address pc) {
192 assert(pc != NULL,"Must be non null");
193 assert(exception.not_null(),"Must be non null");
194 if (exception->klass() == exception_type()) {
195 return (test_address(pc));
196 }
197
198 return NULL;
199 }
200
201
202 bool ExceptionCache::match_exception_with_space(Handle exception) {
203 assert(exception.not_null(),"Must be non null");
204 if (exception->klass() == exception_type() && count() < cache_size) {
205 return true;
206 }
207 return false;
208 }
209
210
211 address ExceptionCache::test_address(address addr) {
212 for (int i=0; i<count(); i++) {
213 if (pc_at(i) == addr) {
214 return handler_at(i);
215 }
216 }
217 return NULL;
218 }
219
220
221 bool ExceptionCache::add_address_and_handler(address addr, address handler) {
222 if (test_address(addr) == handler) return true;
223 if (count() < cache_size) {
224 set_pc_at(count(),addr);
225 set_handler_at(count(), handler);
226 increment_count();
227 return true;
228 }
229 return false;
230 }
231
232
233 // private method for handling exception cache
234 // These methods are private, and used to manipulate the exception cache
235 // directly.
236 ExceptionCache* nmethod::exception_cache_entry_for_exception(Handle exception) {
237 ExceptionCache* ec = exception_cache();
238 while (ec != NULL) {
239 if (ec->match_exception_with_space(exception)) {
240 return ec;
241 }
242 ec = ec->next();
243 }
244 return NULL;
245 }
246
247
248 //-----------------------------------------------------------------------------
249
250
251 // Helper used by both find_pc_desc methods.
252 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) {
253 NOT_PRODUCT(++nmethod_stats.pc_desc_tests);
254 if (!approximate)
255 return pc->pc_offset() == pc_offset;
256 else
257 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset();
258 }
259
260 void PcDescCache::reset_to(PcDesc* initial_pc_desc) {
261 if (initial_pc_desc == NULL) {
262 _last_pc_desc = NULL; // native method
263 return;
264 }
265 NOT_PRODUCT(++nmethod_stats.pc_desc_resets);
266 // reset the cache by filling it with benign (non-null) values
267 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel");
268 _last_pc_desc = initial_pc_desc + 1; // first valid one is after sentinel
269 for (int i = 0; i < cache_size; i++)
270 _pc_descs[i] = initial_pc_desc;
271 }
272
273 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) {
274 NOT_PRODUCT(++nmethod_stats.pc_desc_queries);
275 NOT_PRODUCT(if (approximate) ++nmethod_stats.pc_desc_approx);
276
277 // In order to prevent race conditions do not load cache elements
278 // repeatedly, but use a local copy:
279 PcDesc* res;
280
281 // Step one: Check the most recently returned value.
282 res = _last_pc_desc;
283 if (res == NULL) return NULL; // native method; no PcDescs at all
284 if (match_desc(res, pc_offset, approximate)) {
285 NOT_PRODUCT(++nmethod_stats.pc_desc_repeats);
286 return res;
287 }
288
289 // Step two: Check the LRU cache.
290 for (int i = 0; i < cache_size; i++) {
291 res = _pc_descs[i];
292 if (res->pc_offset() < 0) break; // optimization: skip empty cache
293 if (match_desc(res, pc_offset, approximate)) {
294 NOT_PRODUCT(++nmethod_stats.pc_desc_hits);
295 _last_pc_desc = res; // record this cache hit in case of repeat
296 return res;
297 }
298 }
299
300 // Report failure.
301 return NULL;
302 }
303
304 void PcDescCache::add_pc_desc(PcDesc* pc_desc) {
305 NOT_PRODUCT(++nmethod_stats.pc_desc_adds);
306 // Update the LRU cache by shifting pc_desc forward:
307 for (int i = 0; i < cache_size; i++) {
308 PcDesc* next = _pc_descs[i];
309 _pc_descs[i] = pc_desc;
310 pc_desc = next;
311 }
312 // Note: Do not update _last_pc_desc. It fronts for the LRU cache.
313 }
314
315 // adjust pcs_size so that it is a multiple of both oopSize and
316 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple
317 // of oopSize, then 2*sizeof(PcDesc) is)
318 static int adjust_pcs_size(int pcs_size) {
319 int nsize = round_to(pcs_size, oopSize);
320 if ((nsize % sizeof(PcDesc)) != 0) {
321 nsize = pcs_size + sizeof(PcDesc);
322 }
323 assert((nsize % oopSize) == 0, "correct alignment");
324 return nsize;
325 }
326
327 //-----------------------------------------------------------------------------
328
329
330 void nmethod::add_exception_cache_entry(ExceptionCache* new_entry) {
331 assert(ExceptionCache_lock->owned_by_self(),"Must hold the ExceptionCache_lock");
332 assert(new_entry != NULL,"Must be non null");
333 assert(new_entry->next() == NULL, "Must be null");
334
335 if (exception_cache() != NULL) {
336 new_entry->set_next(exception_cache());
337 }
338 set_exception_cache(new_entry);
339 }
340
341 void nmethod::remove_from_exception_cache(ExceptionCache* ec) {
342 ExceptionCache* prev = NULL;
343 ExceptionCache* curr = exception_cache();
344 assert(curr != NULL, "nothing to remove");
345 // find the previous and next entry of ec
346 while (curr != ec) {
347 prev = curr;
348 curr = curr->next();
349 assert(curr != NULL, "ExceptionCache not found");
350 }
351 // now: curr == ec
352 ExceptionCache* next = curr->next();
353 if (prev == NULL) {
354 set_exception_cache(next);
355 } else {
356 prev->set_next(next);
357 }
358 delete curr;
359 }
360
361
362 // public method for accessing the exception cache
363 // These are the public access methods.
364 address nmethod::handler_for_exception_and_pc(Handle exception, address pc) {
365 // We never grab a lock to read the exception cache, so we may
366 // have false negatives. This is okay, as it can only happen during
367 // the first few exception lookups for a given nmethod.
368 ExceptionCache* ec = exception_cache();
369 while (ec != NULL) {
370 address ret_val;
371 if ((ret_val = ec->match(exception,pc)) != NULL) {
372 return ret_val;
373 }
374 ec = ec->next();
375 }
376 return NULL;
377 }
378
379
380 void nmethod::add_handler_for_exception_and_pc(Handle exception, address pc, address handler) {
381 // There are potential race conditions during exception cache updates, so we
382 // must own the ExceptionCache_lock before doing ANY modifications. Because
383 // we don't lock during reads, it is possible to have several threads attempt
384 // to update the cache with the same data. We need to check for already inserted
385 // copies of the current data before adding it.
386
387 MutexLocker ml(ExceptionCache_lock);
388 ExceptionCache* target_entry = exception_cache_entry_for_exception(exception);
389
390 if (target_entry == NULL || !target_entry->add_address_and_handler(pc,handler)) {
391 target_entry = new ExceptionCache(exception,pc,handler);
392 add_exception_cache_entry(target_entry);
393 }
394 }
395
396
397 //-------------end of code for ExceptionCache--------------
398
399
400 void nmFlags::clear() {
401 assert(sizeof(nmFlags) == sizeof(int), "using more than one word for nmFlags");
402 *(jint*)this = 0;
403 }
404
405 int nmethod::total_size() const {
406 return
407 code_size() +
408 stub_size() +
409 consts_size() +
410 scopes_data_size() +
411 scopes_pcs_size() +
412 handler_table_size() +
413 nul_chk_table_size();
414 }
415
416 const char* nmethod::compile_kind() const {
417 if (method() == NULL) return "unloaded";
418 if (is_native_method()) return "c2n";
419 if (is_osr_method()) return "osr";
420 return NULL;
421 }
422
423 // %%% This variable is no longer used?
424 int nmethod::_zombie_instruction_size = NativeJump::instruction_size;
425
426
427 nmethod* nmethod::new_native_nmethod(methodHandle method,
428 CodeBuffer *code_buffer,
429 int vep_offset,
430 int frame_complete,
431 int frame_size,
432 ByteSize basic_lock_owner_sp_offset,
433 ByteSize basic_lock_sp_offset,
434 OopMapSet* oop_maps) {
435 // create nmethod
436 nmethod* nm = NULL;
437 {
438 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
439 int native_nmethod_size = allocation_size(code_buffer, sizeof(nmethod));
440 CodeOffsets offsets;
441 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
442 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
443 nm = new (native_nmethod_size)
444 nmethod(method(), native_nmethod_size, &offsets,
445 code_buffer, frame_size,
446 basic_lock_owner_sp_offset, basic_lock_sp_offset,
447 oop_maps);
448 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_native_nmethod(nm));
449 if (PrintAssembly && nm != NULL)
450 Disassembler::decode(nm);
451 }
452 // verify nmethod
453 debug_only(if (nm) nm->verify();) // might block
454
455 if (nm != NULL) {
456 nm->log_new_nmethod();
457 }
458
459 return nm;
460 }
461
462 #ifdef HAVE_DTRACE_H
463 nmethod* nmethod::new_dtrace_nmethod(methodHandle method,
464 CodeBuffer *code_buffer,
465 int vep_offset,
466 int trap_offset,
467 int frame_complete,
468 int frame_size) {
469 // create nmethod
470 nmethod* nm = NULL;
471 {
472 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
473 int nmethod_size = allocation_size(code_buffer, sizeof(nmethod));
474 CodeOffsets offsets;
475 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
476 offsets.set_value(CodeOffsets::Dtrace_trap, trap_offset);
477 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
478
479 nm = new (nmethod_size) nmethod(method(), nmethod_size, &offsets, code_buffer, frame_size);
480
481 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_nmethod(nm));
482 if (PrintAssembly && nm != NULL)
483 Disassembler::decode(nm);
484 }
485 // verify nmethod
486 debug_only(if (nm) nm->verify();) // might block
487
488 if (nm != NULL) {
489 nm->log_new_nmethod();
490 }
491
492 return nm;
493 }
494
495 #endif // def HAVE_DTRACE_H
496
497 nmethod* nmethod::new_nmethod(methodHandle method,
498 int compile_id,
499 int entry_bci,
500 CodeOffsets* offsets,
501 int orig_pc_offset,
502 DebugInformationRecorder* debug_info,
503 Dependencies* dependencies,
504 CodeBuffer* code_buffer, int frame_size,
505 OopMapSet* oop_maps,
506 ExceptionHandlerTable* handler_table,
507 ImplicitExceptionTable* nul_chk_table,
508 AbstractCompiler* compiler,
509 int comp_level
510 )
511 {
512 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
513 // create nmethod
514 nmethod* nm = NULL;
515 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
516 int nmethod_size =
517 allocation_size(code_buffer, sizeof(nmethod))
518 + adjust_pcs_size(debug_info->pcs_size())
519 + round_to(dependencies->size_in_bytes() , oopSize)
520 + round_to(handler_table->size_in_bytes(), oopSize)
521 + round_to(nul_chk_table->size_in_bytes(), oopSize)
522 + round_to(debug_info->data_size() , oopSize);
523 nm = new (nmethod_size)
524 nmethod(method(), nmethod_size, compile_id, entry_bci, offsets,
525 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size,
526 oop_maps,
527 handler_table,
528 nul_chk_table,
529 compiler,
530 comp_level);
531 if (nm != NULL) {
532 // To make dependency checking during class loading fast, record
533 // the nmethod dependencies in the classes it is dependent on.
534 // This allows the dependency checking code to simply walk the
535 // class hierarchy above the loaded class, checking only nmethods
536 // which are dependent on those classes. The slow way is to
537 // check every nmethod for dependencies which makes it linear in
538 // the number of methods compiled. For applications with a lot
539 // classes the slow way is too slow.
540 for (Dependencies::DepStream deps(nm); deps.next(); ) {
541 klassOop klass = deps.context_type();
542 if (klass == NULL) continue; // ignore things like evol_method
543
544 // record this nmethod as dependent on this klass
545 instanceKlass::cast(klass)->add_dependent_nmethod(nm);
546 }
547 }
548 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_nmethod(nm));
549 if (PrintAssembly && nm != NULL)
550 Disassembler::decode(nm);
551 }
552
553 // verify nmethod
554 debug_only(if (nm) nm->verify();) // might block
555
556 if (nm != NULL) {
557 nm->log_new_nmethod();
558 }
559
560 // done
561 return nm;
562 }
563
564
565 // For native wrappers
566 nmethod::nmethod(
567 methodOop method,
568 int nmethod_size,
569 CodeOffsets* offsets,
570 CodeBuffer* code_buffer,
571 int frame_size,
572 ByteSize basic_lock_owner_sp_offset,
573 ByteSize basic_lock_sp_offset,
574 OopMapSet* oop_maps )
575 : CodeBlob("native nmethod", code_buffer, sizeof(nmethod),
576 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps),
577 _compiled_synchronized_native_basic_lock_owner_sp_offset(basic_lock_owner_sp_offset),
578 _compiled_synchronized_native_basic_lock_sp_offset(basic_lock_sp_offset)
579 {
580 {
581 debug_only(No_Safepoint_Verifier nsv;)
582 assert_locked_or_safepoint(CodeCache_lock);
583
584 NOT_PRODUCT(_has_debug_info = false);
585 _oops_do_mark_link = NULL;
586 _method = method;
587 _entry_bci = InvocationEntryBci;
588 _osr_link = NULL;
589 _scavenge_root_link = NULL;
590 _scavenge_root_state = 0;
591 _compiler = NULL;
592 // We have no exception handler or deopt handler make the
593 // values something that will never match a pc like the nmethod vtable entry
594 _exception_offset = 0;
595 _deoptimize_offset = 0;
596 _orig_pc_offset = 0;
597 #ifdef HAVE_DTRACE_H
598 _trap_offset = 0;
599 #endif // def HAVE_DTRACE_H
600 _stub_offset = data_offset();
601 _consts_offset = data_offset();
602 _scopes_data_offset = data_offset();
603 _scopes_pcs_offset = _scopes_data_offset;
604 _dependencies_offset = _scopes_pcs_offset;
605 _handler_table_offset = _dependencies_offset;
606 _nul_chk_table_offset = _handler_table_offset;
607 _nmethod_end_offset = _nul_chk_table_offset;
608 _compile_id = 0; // default
609 _comp_level = CompLevel_none;
610 _entry_point = instructions_begin();
611 _verified_entry_point = instructions_begin() + offsets->value(CodeOffsets::Verified_Entry);
612 _osr_entry_point = NULL;
613 _exception_cache = NULL;
614 _pc_desc_cache.reset_to(NULL);
615
616 flags.clear();
617 flags.state = alive;
618 _markedForDeoptimization = 0;
619
620 _lock_count = 0;
621 _stack_traversal_mark = 0;
622
623 code_buffer->copy_oops_to(this);
624 debug_only(verify_scavenge_root_oops());
625 CodeCache::commit(this);
626 VTune::create_nmethod(this);
627 }
628
629 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
630 ttyLocker ttyl; // keep the following output all in one block
631 // This output goes directly to the tty, not the compiler log.
632 // To enable tools to match it up with the compilation activity,
633 // be sure to tag this tty output with the compile ID.
634 if (xtty != NULL) {
635 xtty->begin_head("print_native_nmethod");
636 xtty->method(_method);
637 xtty->stamp();
638 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
639 }
640 // print the header part first
641 print();
642 // then print the requested information
643 if (PrintNativeNMethods) {
644 print_code();
645 oop_maps->print();
646 }
647 if (PrintRelocations) {
648 print_relocations();
649 }
650 if (xtty != NULL) {
651 xtty->tail("print_native_nmethod");
652 }
653 }
654 Events::log("Create nmethod " INTPTR_FORMAT, this);
655 }
656
657 // For dtrace wrappers
658 #ifdef HAVE_DTRACE_H
659 nmethod::nmethod(
660 methodOop method,
661 int nmethod_size,
662 CodeOffsets* offsets,
663 CodeBuffer* code_buffer,
664 int frame_size)
665 : CodeBlob("dtrace nmethod", code_buffer, sizeof(nmethod),
666 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, NULL),
667 _compiled_synchronized_native_basic_lock_owner_sp_offset(in_ByteSize(-1)),
668 _compiled_synchronized_native_basic_lock_sp_offset(in_ByteSize(-1))
669 {
670 {
671 debug_only(No_Safepoint_Verifier nsv;)
672 assert_locked_or_safepoint(CodeCache_lock);
673
674 NOT_PRODUCT(_has_debug_info = false);
675 _oops_do_mark_link = NULL;
676 _method = method;
677 _entry_bci = InvocationEntryBci;
678 _osr_link = NULL;
679 _scavenge_root_link = NULL;
680 _scavenge_root_state = 0;
681 _compiler = NULL;
682 // We have no exception handler or deopt handler make the
683 // values something that will never match a pc like the nmethod vtable entry
684 _exception_offset = 0;
685 _deoptimize_offset = 0;
686 _trap_offset = offsets->value(CodeOffsets::Dtrace_trap);
687 _orig_pc_offset = 0;
688 _stub_offset = data_offset();
689 _consts_offset = data_offset();
690 _scopes_data_offset = data_offset();
691 _scopes_pcs_offset = _scopes_data_offset;
692 _dependencies_offset = _scopes_pcs_offset;
693 _handler_table_offset = _dependencies_offset;
694 _nul_chk_table_offset = _handler_table_offset;
695 _nmethod_end_offset = _nul_chk_table_offset;
696 _compile_id = 0; // default
697 _comp_level = CompLevel_none;
698 _entry_point = instructions_begin();
699 _verified_entry_point = instructions_begin() + offsets->value(CodeOffsets::Verified_Entry);
700 _osr_entry_point = NULL;
701 _exception_cache = NULL;
702 _pc_desc_cache.reset_to(NULL);
703
704 flags.clear();
705 flags.state = alive;
706 _markedForDeoptimization = 0;
707
708 _lock_count = 0;
709 _stack_traversal_mark = 0;
710
711 code_buffer->copy_oops_to(this);
712 debug_only(verify_scavenge_root_oops());
713 CodeCache::commit(this);
714 VTune::create_nmethod(this);
715 }
716
717 if (PrintNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
718 ttyLocker ttyl; // keep the following output all in one block
719 // This output goes directly to the tty, not the compiler log.
720 // To enable tools to match it up with the compilation activity,
721 // be sure to tag this tty output with the compile ID.
722 if (xtty != NULL) {
723 xtty->begin_head("print_dtrace_nmethod");
724 xtty->method(_method);
725 xtty->stamp();
726 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
727 }
728 // print the header part first
729 print();
730 // then print the requested information
731 if (PrintNMethods) {
732 print_code();
733 }
734 if (PrintRelocations) {
735 print_relocations();
736 }
737 if (xtty != NULL) {
738 xtty->tail("print_dtrace_nmethod");
739 }
740 }
741 Events::log("Create nmethod " INTPTR_FORMAT, this);
742 }
743 #endif // def HAVE_DTRACE_H
744
745 void* nmethod::operator new(size_t size, int nmethod_size) {
746 // Always leave some room in the CodeCache for I2C/C2I adapters
747 if (CodeCache::unallocated_capacity() < CodeCacheMinimumFreeSpace) return NULL;
748 return CodeCache::allocate(nmethod_size);
749 }
750
751
752 nmethod::nmethod(
753 methodOop method,
754 int nmethod_size,
755 int compile_id,
756 int entry_bci,
757 CodeOffsets* offsets,
758 int orig_pc_offset,
759 DebugInformationRecorder* debug_info,
760 Dependencies* dependencies,
761 CodeBuffer *code_buffer,
762 int frame_size,
763 OopMapSet* oop_maps,
764 ExceptionHandlerTable* handler_table,
765 ImplicitExceptionTable* nul_chk_table,
766 AbstractCompiler* compiler,
767 int comp_level
768 )
769 : CodeBlob("nmethod", code_buffer, sizeof(nmethod),
770 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps),
771 _compiled_synchronized_native_basic_lock_owner_sp_offset(in_ByteSize(-1)),
772 _compiled_synchronized_native_basic_lock_sp_offset(in_ByteSize(-1))
773 {
774 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
775 {
776 debug_only(No_Safepoint_Verifier nsv;)
777 assert_locked_or_safepoint(CodeCache_lock);
778
779 NOT_PRODUCT(_has_debug_info = false);
780 _oops_do_mark_link = NULL;
781 _method = method;
782 _compile_id = compile_id;
783 _comp_level = comp_level;
784 _entry_bci = entry_bci;
785 _osr_link = NULL;
786 _scavenge_root_link = NULL;
787 _scavenge_root_state = 0;
788 _compiler = compiler;
789 _orig_pc_offset = orig_pc_offset;
790 #ifdef HAVE_DTRACE_H
791 _trap_offset = 0;
792 #endif // def HAVE_DTRACE_H
793 _stub_offset = instructions_offset() + code_buffer->total_offset_of(code_buffer->stubs()->start());
794
795 // Exception handler and deopt handler are in the stub section
796 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
797 _deoptimize_offset = _stub_offset + offsets->value(CodeOffsets::Deopt);
798 _consts_offset = instructions_offset() + code_buffer->total_offset_of(code_buffer->consts()->start());
799 _scopes_data_offset = data_offset();
800 _scopes_pcs_offset = _scopes_data_offset + round_to(debug_info->data_size (), oopSize);
801 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
802 _handler_table_offset = _dependencies_offset + round_to(dependencies->size_in_bytes (), oopSize);
803 _nul_chk_table_offset = _handler_table_offset + round_to(handler_table->size_in_bytes(), oopSize);
804 _nmethod_end_offset = _nul_chk_table_offset + round_to(nul_chk_table->size_in_bytes(), oopSize);
805
806 _entry_point = instructions_begin();
807 _verified_entry_point = instructions_begin() + offsets->value(CodeOffsets::Verified_Entry);
808 _osr_entry_point = instructions_begin() + offsets->value(CodeOffsets::OSR_Entry);
809 _exception_cache = NULL;
810 _pc_desc_cache.reset_to(scopes_pcs_begin());
811
812 flags.clear();
813 flags.state = alive;
814 _markedForDeoptimization = 0;
815
816 _unload_reported = false; // jvmti state
817
818 _lock_count = 0;
819 _stack_traversal_mark = 0;
820
821 // Copy contents of ScopeDescRecorder to nmethod
822 code_buffer->copy_oops_to(this);
823 debug_info->copy_to(this);
824 dependencies->copy_to(this);
825 if (ScavengeRootsInCode && detect_scavenge_root_oops()) {
826 CodeCache::add_scavenge_root_nmethod(this);
827 }
828 debug_only(verify_scavenge_root_oops());
829
830 CodeCache::commit(this);
831
832 VTune::create_nmethod(this);
833
834 // Copy contents of ExceptionHandlerTable to nmethod
835 handler_table->copy_to(this);
836 nul_chk_table->copy_to(this);
837
838 // we use the information of entry points to find out if a method is
839 // static or non static
840 assert(compiler->is_c2() ||
841 _method->is_static() == (entry_point() == _verified_entry_point),
842 " entry points must be same for static methods and vice versa");
843 }
844
845 bool printnmethods = PrintNMethods
846 || CompilerOracle::should_print(_method)
847 || CompilerOracle::has_option_string(_method, "PrintNMethods");
848 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
849 print_nmethod(printnmethods);
850 }
851
852 // Note: Do not verify in here as the CodeCache_lock is
853 // taken which would conflict with the CompiledIC_lock
854 // which taken during the verification of call sites.
855 // (was bug - gri 10/25/99)
856
857 Events::log("Create nmethod " INTPTR_FORMAT, this);
858 }
859
860
861 // Print a short set of xml attributes to identify this nmethod. The
862 // output should be embedded in some other element.
863 void nmethod::log_identity(xmlStream* log) const {
864 log->print(" compile_id='%d'", compile_id());
865 const char* nm_kind = compile_kind();
866 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind);
867 if (compiler() != NULL) {
868 log->print(" compiler='%s'", compiler()->name());
869 }
870 #ifdef TIERED
871 log->print(" level='%d'", comp_level());
872 #endif // TIERED
873 }
874
875
876 #define LOG_OFFSET(log, name) \
877 if ((intptr_t)name##_end() - (intptr_t)name##_begin()) \
878 log->print(" " XSTR(name) "_offset='%d'" , \
879 (intptr_t)name##_begin() - (intptr_t)this)
880
881
882 void nmethod::log_new_nmethod() const {
883 if (LogCompilation && xtty != NULL) {
884 ttyLocker ttyl;
885 HandleMark hm;
886 xtty->begin_elem("nmethod");
887 log_identity(xtty);
888 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'",
889 instructions_begin(), size());
890 xtty->print(" address='" INTPTR_FORMAT "'", (intptr_t) this);
891
892 LOG_OFFSET(xtty, relocation);
893 LOG_OFFSET(xtty, code);
894 LOG_OFFSET(xtty, stub);
895 LOG_OFFSET(xtty, consts);
896 LOG_OFFSET(xtty, scopes_data);
897 LOG_OFFSET(xtty, scopes_pcs);
898 LOG_OFFSET(xtty, dependencies);
899 LOG_OFFSET(xtty, handler_table);
900 LOG_OFFSET(xtty, nul_chk_table);
901 LOG_OFFSET(xtty, oops);
902
903 xtty->method(method());
904 xtty->stamp();
905 xtty->end_elem();
906 }
907 }
908
909 #undef LOG_OFFSET
910
911
912 // Print out more verbose output usually for a newly created nmethod.
913 void nmethod::print_on(outputStream* st, const char* title) const {
914 if (st != NULL) {
915 ttyLocker ttyl;
916 // Print a little tag line that looks like +PrintCompilation output:
917 int tlen = (int) strlen(title);
918 bool do_nl = false;
919 if (tlen > 0 && title[tlen-1] == '\n') { tlen--; do_nl = true; }
920 st->print("%3d%c %.*s",
921 compile_id(),
922 is_osr_method() ? '%' :
923 method() != NULL &&
924 is_native_method() ? 'n' : ' ',
925 tlen, title);
926 #ifdef TIERED
927 st->print(" (%d) ", comp_level());
928 #endif // TIERED
929 if (WizardMode) st->print(" (" INTPTR_FORMAT ")", this);
930 if (Universe::heap()->is_gc_active() && method() != NULL) {
931 st->print("(method)");
932 } else if (method() != NULL) {
933 method()->print_short_name(st);
934 if (is_osr_method())
935 st->print(" @ %d", osr_entry_bci());
936 if (method()->code_size() > 0)
937 st->print(" (%d bytes)", method()->code_size());
938 }
939
940 if (do_nl) st->cr();
941 }
942 }
943
944
945 void nmethod::print_nmethod(bool printmethod) {
946 ttyLocker ttyl; // keep the following output all in one block
947 if (xtty != NULL) {
948 xtty->begin_head("print_nmethod");
949 xtty->stamp();
950 xtty->end_head();
951 }
952 // print the header part first
953 print();
954 // then print the requested information
955 if (printmethod) {
956 print_code();
957 print_pcs();
958 oop_maps()->print();
959 }
960 if (PrintDebugInfo) {
961 print_scopes();
962 }
963 if (PrintRelocations) {
964 print_relocations();
965 }
966 if (PrintDependencies) {
967 print_dependencies();
968 }
969 if (PrintExceptionHandlers) {
970 print_handler_table();
971 print_nul_chk_table();
972 }
973 if (xtty != NULL) {
974 xtty->tail("print_nmethod");
975 }
976 }
977
978
979 void nmethod::set_version(int v) {
980 flags.version = v;
981 }
982
983
984 ScopeDesc* nmethod::scope_desc_at(address pc) {
985 PcDesc* pd = pc_desc_at(pc);
986 guarantee(pd != NULL, "scope must be present");
987 return new ScopeDesc(this, pd->scope_decode_offset(),
988 pd->obj_decode_offset(), pd->should_reexecute());
989 }
990
991
992 void nmethod::clear_inline_caches() {
993 assert(SafepointSynchronize::is_at_safepoint(), "cleaning of IC's only allowed at safepoint");
994 if (is_zombie()) {
995 return;
996 }
997
998 RelocIterator iter(this);
999 while (iter.next()) {
1000 iter.reloc()->clear_inline_cache();
1001 }
1002 }
1003
1004
1005 void nmethod::cleanup_inline_caches() {
1006
1007 assert(SafepointSynchronize::is_at_safepoint() &&
1008 !CompiledIC_lock->is_locked() &&
1009 !Patching_lock->is_locked(), "no threads must be updating the inline caches by them selfs");
1010
1011 // If the method is not entrant or zombie then a JMP is plastered over the
1012 // first few bytes. If an oop in the old code was there, that oop
1013 // should not get GC'd. Skip the first few bytes of oops on
1014 // not-entrant methods.
1015 address low_boundary = verified_entry_point();
1016 if (!is_in_use()) {
1017 low_boundary += NativeJump::instruction_size;
1018 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1019 // This means that the low_boundary is going to be a little too high.
1020 // This shouldn't matter, since oops of non-entrant methods are never used.
1021 // In fact, why are we bothering to look at oops in a non-entrant method??
1022 }
1023
1024 // Find all calls in an nmethod, and clear the ones that points to zombie methods
1025 ResourceMark rm;
1026 RelocIterator iter(this, low_boundary);
1027 while(iter.next()) {
1028 switch(iter.type()) {
1029 case relocInfo::virtual_call_type:
1030 case relocInfo::opt_virtual_call_type: {
1031 CompiledIC *ic = CompiledIC_at(iter.reloc());
1032 // Ok, to lookup references to zombies here
1033 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
1034 if( cb != NULL && cb->is_nmethod() ) {
1035 nmethod* nm = (nmethod*)cb;
1036 // Clean inline caches pointing to both zombie and not_entrant methods
1037 if (!nm->is_in_use()) ic->set_to_clean();
1038 }
1039 break;
1040 }
1041 case relocInfo::static_call_type: {
1042 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
1043 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
1044 if( cb != NULL && cb->is_nmethod() ) {
1045 nmethod* nm = (nmethod*)cb;
1046 // Clean inline caches pointing to both zombie and not_entrant methods
1047 if (!nm->is_in_use()) csc->set_to_clean();
1048 }
1049 break;
1050 }
1051 }
1052 }
1053 }
1054
1055 // This is a private interface with the sweeper.
1056 void nmethod::mark_as_seen_on_stack() {
1057 assert(is_not_entrant(), "must be a non-entrant method");
1058 set_stack_traversal_mark(NMethodSweeper::traversal_count());
1059 }
1060
1061 // Tell if a non-entrant method can be converted to a zombie (i.e., there is no activations on the stack)
1062 bool nmethod::can_not_entrant_be_converted() {
1063 assert(is_not_entrant(), "must be a non-entrant method");
1064 assert(SafepointSynchronize::is_at_safepoint(), "must be called during a safepoint");
1065
1066 // Since the nmethod sweeper only does partial sweep the sweeper's traversal
1067 // count can be greater than the stack traversal count before it hits the
1068 // nmethod for the second time.
1069 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count();
1070 }
1071
1072 void nmethod::inc_decompile_count() {
1073 // Could be gated by ProfileTraps, but do not bother...
1074 methodOop m = method();
1075 if (m == NULL) return;
1076 methodDataOop mdo = m->method_data();
1077 if (mdo == NULL) return;
1078 // There is a benign race here. See comments in methodDataOop.hpp.
1079 mdo->inc_decompile_count();
1080 }
1081
1082 void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) {
1083
1084 post_compiled_method_unload();
1085
1086 // Since this nmethod is being unloaded, make sure that dependencies
1087 // recorded in instanceKlasses get flushed and pass non-NULL closure to
1088 // indicate that this work is being done during a GC.
1089 assert(Universe::heap()->is_gc_active(), "should only be called during gc");
1090 assert(is_alive != NULL, "Should be non-NULL");
1091 // A non-NULL is_alive closure indicates that this is being called during GC.
1092 flush_dependencies(is_alive);
1093
1094 // Break cycle between nmethod & method
1095 if (TraceClassUnloading && WizardMode) {
1096 tty->print_cr("[Class unloading: Making nmethod " INTPTR_FORMAT
1097 " unloadable], methodOop(" INTPTR_FORMAT
1098 "), cause(" INTPTR_FORMAT ")",
1099 this, (address)_method, (address)cause);
1100 if (!Universe::heap()->is_gc_active())
1101 cause->klass()->print();
1102 }
1103 // Unlink the osr method, so we do not look this up again
1104 if (is_osr_method()) {
1105 invalidate_osr_method();
1106 }
1107 // If _method is already NULL the methodOop is about to be unloaded,
1108 // so we don't have to break the cycle. Note that it is possible to
1109 // have the methodOop live here, in case we unload the nmethod because
1110 // it is pointing to some oop (other than the methodOop) being unloaded.
1111 if (_method != NULL) {
1112 // OSR methods point to the methodOop, but the methodOop does not
1113 // point back!
1114 if (_method->code() == this) {
1115 _method->clear_code(); // Break a cycle
1116 }
1117 inc_decompile_count(); // Last chance to make a mark on the MDO
1118 _method = NULL; // Clear the method of this dead nmethod
1119 }
1120 // Make the class unloaded - i.e., change state and notify sweeper
1121 check_safepoint();
1122 if (is_in_use()) {
1123 // Transitioning directly from live to unloaded -- so
1124 // we need to force a cache clean-up; remember this
1125 // for later on.
1126 CodeCache::set_needs_cache_clean(true);
1127 }
1128 flags.state = unloaded;
1129
1130 // The methodOop is gone at this point
1131 assert(_method == NULL, "Tautology");
1132
1133 set_osr_link(NULL);
1134 //set_scavenge_root_link(NULL); // done by prune_scavenge_root_nmethods
1135 NMethodSweeper::notify(this);
1136 }
1137
1138 void nmethod::invalidate_osr_method() {
1139 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
1140 if (_entry_bci != InvalidOSREntryBci)
1141 inc_decompile_count();
1142 // Remove from list of active nmethods
1143 if (method() != NULL)
1144 instanceKlass::cast(method()->method_holder())->remove_osr_nmethod(this);
1145 // Set entry as invalid
1146 _entry_bci = InvalidOSREntryBci;
1147 }
1148
1149 void nmethod::log_state_change(int state) const {
1150 if (LogCompilation) {
1151 if (xtty != NULL) {
1152 ttyLocker ttyl; // keep the following output all in one block
1153 xtty->begin_elem("make_not_entrant %sthread='" UINTX_FORMAT "'",
1154 (state == zombie ? "zombie='1' " : ""),
1155 os::current_thread_id());
1156 log_identity(xtty);
1157 xtty->stamp();
1158 xtty->end_elem();
1159 }
1160 }
1161 if (PrintCompilation) {
1162 print_on(tty, state == zombie ? "made zombie " : "made not entrant ");
1163 tty->cr();
1164 }
1165 }
1166
1167 // Common functionality for both make_not_entrant and make_zombie
1168 void nmethod::make_not_entrant_or_zombie(int state) {
1169 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant");
1170
1171 // Code for an on-stack-replacement nmethod is removed when a class gets unloaded.
1172 // They never become zombie/non-entrant, so the nmethod sweeper will never remove
1173 // them. Instead the entry_bci is set to InvalidOSREntryBci, so the osr nmethod
1174 // will never be used anymore. That the nmethods only gets removed when class unloading
1175 // happens, make life much simpler, since the nmethods are not just going to disappear
1176 // out of the blue.
1177 if (is_osr_method()) {
1178 if (osr_entry_bci() != InvalidOSREntryBci) {
1179 // only log this once
1180 log_state_change(state);
1181 }
1182 invalidate_osr_method();
1183 return;
1184 }
1185
1186 // If the method is already zombie or set to the state we want, nothing to do
1187 if (is_zombie() || (state == not_entrant && is_not_entrant())) {
1188 return;
1189 }
1190
1191 log_state_change(state);
1192
1193 // Make sure the nmethod is not flushed in case of a safepoint in code below.
1194 nmethodLocker nml(this);
1195
1196 {
1197 // Enter critical section. Does not block for safepoint.
1198 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1199 // The caller can be calling the method statically or through an inline
1200 // cache call.
1201 if (!is_not_entrant()) {
1202 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
1203 SharedRuntime::get_handle_wrong_method_stub());
1204 assert (NativeJump::instruction_size == nmethod::_zombie_instruction_size, "");
1205 }
1206
1207 // When the nmethod becomes zombie it is no longer alive so the
1208 // dependencies must be flushed. nmethods in the not_entrant
1209 // state will be flushed later when the transition to zombie
1210 // happens or they get unloaded.
1211 if (state == zombie) {
1212 assert(SafepointSynchronize::is_at_safepoint(), "must be done at safepoint");
1213 flush_dependencies(NULL);
1214 } else {
1215 assert(state == not_entrant, "other cases may need to be handled differently");
1216 }
1217
1218 // Change state
1219 flags.state = state;
1220 } // leave critical region under Patching_lock
1221
1222 if (state == not_entrant) {
1223 Events::log("Make nmethod not entrant " INTPTR_FORMAT, this);
1224 } else {
1225 Events::log("Make nmethod zombie " INTPTR_FORMAT, this);
1226 }
1227
1228 if (TraceCreateZombies) {
1229 tty->print_cr("nmethod <" INTPTR_FORMAT "> code made %s", this, (state == not_entrant) ? "not entrant" : "zombie");
1230 }
1231
1232 // Make sweeper aware that there is a zombie method that needs to be removed
1233 NMethodSweeper::notify(this);
1234
1235 // not_entrant only stuff
1236 if (state == not_entrant) {
1237 mark_as_seen_on_stack();
1238 }
1239
1240 // It's a true state change, so mark the method as decompiled.
1241 inc_decompile_count();
1242
1243
1244 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload event
1245 // and it hasn't already been reported for this nmethod then report it now.
1246 // (the event may have been reported earilier if the GC marked it for unloading).
1247 if (state == zombie) {
1248
1249 DTRACE_METHOD_UNLOAD_PROBE(method());
1250
1251 if (JvmtiExport::should_post_compiled_method_unload() &&
1252 !unload_reported()) {
1253 assert(method() != NULL, "checking");
1254 {
1255 HandleMark hm;
1256 JvmtiExport::post_compiled_method_unload_at_safepoint(
1257 method()->jmethod_id(), code_begin());
1258 }
1259 set_unload_reported();
1260 }
1261 }
1262
1263
1264 // Zombie only stuff
1265 if (state == zombie) {
1266 VTune::delete_nmethod(this);
1267 }
1268
1269 // Check whether method got unloaded at a safepoint before this,
1270 // if so we can skip the flushing steps below
1271 if (method() == NULL) return;
1272
1273 // Remove nmethod from method.
1274 // We need to check if both the _code and _from_compiled_code_entry_point
1275 // refer to this nmethod because there is a race in setting these two fields
1276 // in methodOop as seen in bugid 4947125.
1277 // If the vep() points to the zombie nmethod, the memory for the nmethod
1278 // could be flushed and the compiler and vtable stubs could still call
1279 // through it.
1280 if (method()->code() == this ||
1281 method()->from_compiled_entry() == verified_entry_point()) {
1282 HandleMark hm;
1283 method()->clear_code();
1284 }
1285 }
1286
1287
1288 #ifndef PRODUCT
1289 void nmethod::check_safepoint() {
1290 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
1291 }
1292 #endif
1293
1294
1295 void nmethod::flush() {
1296 // Note that there are no valid oops in the nmethod anymore.
1297 assert(is_zombie() || (is_osr_method() && is_unloaded()), "must be a zombie method");
1298 assert(is_marked_for_reclamation() || (is_osr_method() && is_unloaded()), "must be marked for reclamation");
1299
1300 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed");
1301 check_safepoint();
1302
1303 // completely deallocate this method
1304 EventMark m("flushing nmethod " INTPTR_FORMAT " %s", this, "");
1305 if (PrintMethodFlushing) {
1306 tty->print_cr("*flushing nmethod " INTPTR_FORMAT ". Live blobs: %d", this, CodeCache::nof_blobs());
1307 }
1308
1309 // We need to deallocate any ExceptionCache data.
1310 // Note that we do not need to grab the nmethod lock for this, it
1311 // better be thread safe if we're disposing of it!
1312 ExceptionCache* ec = exception_cache();
1313 set_exception_cache(NULL);
1314 while(ec != NULL) {
1315 ExceptionCache* next = ec->next();
1316 delete ec;
1317 ec = next;
1318 }
1319
1320 if (on_scavenge_root_list()) {
1321 CodeCache::drop_scavenge_root_nmethod(this);
1322 }
1323
1324 ((CodeBlob*)(this))->flush();
1325
1326 CodeCache::free(this);
1327 }
1328
1329
1330 //
1331 // Notify all classes this nmethod is dependent on that it is no
1332 // longer dependent. This should only be called in two situations.
1333 // First, when a nmethod transitions to a zombie all dependents need
1334 // to be clear. Since zombification happens at a safepoint there's no
1335 // synchronization issues. The second place is a little more tricky.
1336 // During phase 1 of mark sweep class unloading may happen and as a
1337 // result some nmethods may get unloaded. In this case the flushing
1338 // of dependencies must happen during phase 1 since after GC any
1339 // dependencies in the unloaded nmethod won't be updated, so
1340 // traversing the dependency information in unsafe. In that case this
1341 // function is called with a non-NULL argument and this function only
1342 // notifies instanceKlasses that are reachable
1343
1344 void nmethod::flush_dependencies(BoolObjectClosure* is_alive) {
1345 assert(SafepointSynchronize::is_at_safepoint(), "must be done at safepoint");
1346 assert(Universe::heap()->is_gc_active() == (is_alive != NULL),
1347 "is_alive is non-NULL if and only if we are called during GC");
1348 if (!has_flushed_dependencies()) {
1349 set_has_flushed_dependencies();
1350 for (Dependencies::DepStream deps(this); deps.next(); ) {
1351 klassOop klass = deps.context_type();
1352 if (klass == NULL) continue; // ignore things like evol_method
1353
1354 // During GC the is_alive closure is non-NULL, and is used to
1355 // determine liveness of dependees that need to be updated.
1356 if (is_alive == NULL || is_alive->do_object_b(klass)) {
1357 instanceKlass::cast(klass)->remove_dependent_nmethod(this);
1358 }
1359 }
1360 }
1361 }
1362
1363
1364 // If this oop is not live, the nmethod can be unloaded.
1365 bool nmethod::can_unload(BoolObjectClosure* is_alive,
1366 OopClosure* keep_alive,
1367 oop* root, bool unloading_occurred) {
1368 assert(root != NULL, "just checking");
1369 oop obj = *root;
1370 if (obj == NULL || is_alive->do_object_b(obj)) {
1371 return false;
1372 }
1373 if (obj->is_compiledICHolder()) {
1374 compiledICHolderOop cichk_oop = compiledICHolderOop(obj);
1375 if (is_alive->do_object_b(
1376 cichk_oop->holder_method()->method_holder()) &&
1377 is_alive->do_object_b(cichk_oop->holder_klass())) {
1378 // The oop should be kept alive
1379 keep_alive->do_oop(root);
1380 return false;
1381 }
1382 }
1383 // If ScavengeRootsInCode is true, an nmethod might be unloaded
1384 // simply because one of its constant oops has gone dead.
1385 // No actual classes need to be unloaded in order for this to occur.
1386 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading");
1387 make_unloaded(is_alive, obj);
1388 return true;
1389 }
1390
1391 // ------------------------------------------------------------------
1392 // post_compiled_method_load_event
1393 // new method for install_code() path
1394 // Transfer information from compilation to jvmti
1395 void nmethod::post_compiled_method_load_event() {
1396
1397 methodOop moop = method();
1398 HS_DTRACE_PROBE8(hotspot, compiled__method__load,
1399 moop->klass_name()->bytes(),
1400 moop->klass_name()->utf8_length(),
1401 moop->name()->bytes(),
1402 moop->name()->utf8_length(),
1403 moop->signature()->bytes(),
1404 moop->signature()->utf8_length(),
1405 code_begin(), code_size());
1406
1407 if (JvmtiExport::should_post_compiled_method_load()) {
1408 JvmtiExport::post_compiled_method_load(this);
1409 }
1410 }
1411
1412 void nmethod::post_compiled_method_unload() {
1413 assert(_method != NULL && !is_unloaded(), "just checking");
1414 DTRACE_METHOD_UNLOAD_PROBE(method());
1415
1416 // If a JVMTI agent has enabled the CompiledMethodUnload event then
1417 // post the event. Sometime later this nmethod will be made a zombie by
1418 // the sweeper but the methodOop will not be valid at that point.
1419 if (JvmtiExport::should_post_compiled_method_unload()) {
1420 assert(!unload_reported(), "already unloaded");
1421 HandleMark hm;
1422 JvmtiExport::post_compiled_method_unload_at_safepoint(
1423 method()->jmethod_id(), code_begin());
1424 }
1425
1426 // The JVMTI CompiledMethodUnload event can be enabled or disabled at
1427 // any time. As the nmethod is being unloaded now we mark it has
1428 // having the unload event reported - this will ensure that we don't
1429 // attempt to report the event in the unlikely scenario where the
1430 // event is enabled at the time the nmethod is made a zombie.
1431 set_unload_reported();
1432 }
1433
1434 // This is called at the end of the strong tracing/marking phase of a
1435 // GC to unload an nmethod if it contains otherwise unreachable
1436 // oops.
1437
1438 void nmethod::do_unloading(BoolObjectClosure* is_alive,
1439 OopClosure* keep_alive, bool unloading_occurred) {
1440 // Make sure the oop's ready to receive visitors
1441 assert(!is_zombie() && !is_unloaded(),
1442 "should not call follow on zombie or unloaded nmethod");
1443
1444 // If the method is not entrant then a JMP is plastered over the
1445 // first few bytes. If an oop in the old code was there, that oop
1446 // should not get GC'd. Skip the first few bytes of oops on
1447 // not-entrant methods.
1448 address low_boundary = verified_entry_point();
1449 if (is_not_entrant()) {
1450 low_boundary += NativeJump::instruction_size;
1451 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1452 // (See comment above.)
1453 }
1454
1455 // The RedefineClasses() API can cause the class unloading invariant
1456 // to no longer be true. See jvmtiExport.hpp for details.
1457 // Also, leave a debugging breadcrumb in local flag.
1458 bool a_class_was_redefined = JvmtiExport::has_redefined_a_class();
1459 if (a_class_was_redefined) {
1460 // This set of the unloading_occurred flag is done before the
1461 // call to post_compiled_method_unload() so that the unloading
1462 // of this nmethod is reported.
1463 unloading_occurred = true;
1464 }
1465
1466 // Follow methodOop
1467 if (can_unload(is_alive, keep_alive, (oop*)&_method, unloading_occurred)) {
1468 return;
1469 }
1470
1471 // Exception cache
1472 ExceptionCache* ec = exception_cache();
1473 while (ec != NULL) {
1474 oop* ex_addr = (oop*)ec->exception_type_addr();
1475 oop ex = *ex_addr;
1476 ExceptionCache* next_ec = ec->next();
1477 if (ex != NULL && !is_alive->do_object_b(ex)) {
1478 assert(!ex->is_compiledICHolder(), "Possible error here");
1479 remove_from_exception_cache(ec);
1480 }
1481 ec = next_ec;
1482 }
1483
1484 // If class unloading occurred we first iterate over all inline caches and
1485 // clear ICs where the cached oop is referring to an unloaded klass or method.
1486 // The remaining live cached oops will be traversed in the relocInfo::oop_type
1487 // iteration below.
1488 if (unloading_occurred) {
1489 RelocIterator iter(this, low_boundary);
1490 while(iter.next()) {
1491 if (iter.type() == relocInfo::virtual_call_type) {
1492 CompiledIC *ic = CompiledIC_at(iter.reloc());
1493 oop ic_oop = ic->cached_oop();
1494 if (ic_oop != NULL && !is_alive->do_object_b(ic_oop)) {
1495 // The only exception is compiledICHolder oops which may
1496 // yet be marked below. (We check this further below).
1497 if (ic_oop->is_compiledICHolder()) {
1498 compiledICHolderOop cichk_oop = compiledICHolderOop(ic_oop);
1499 if (is_alive->do_object_b(
1500 cichk_oop->holder_method()->method_holder()) &&
1501 is_alive->do_object_b(cichk_oop->holder_klass())) {
1502 continue;
1503 }
1504 }
1505 ic->set_to_clean();
1506 assert(ic->cached_oop() == NULL, "cached oop in IC should be cleared")
1507 }
1508 }
1509 }
1510 }
1511
1512 // Compiled code
1513 RelocIterator iter(this, low_boundary);
1514 while (iter.next()) {
1515 if (iter.type() == relocInfo::oop_type) {
1516 oop_Relocation* r = iter.oop_reloc();
1517 // In this loop, we must only traverse those oops directly embedded in
1518 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1519 assert(1 == (r->oop_is_immediate()) +
1520 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1521 "oop must be found in exactly one place");
1522 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1523 if (can_unload(is_alive, keep_alive, r->oop_addr(), unloading_occurred)) {
1524 return;
1525 }
1526 }
1527 }
1528 }
1529
1530
1531 // Scopes
1532 for (oop* p = oops_begin(); p < oops_end(); p++) {
1533 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1534 if (can_unload(is_alive, keep_alive, p, unloading_occurred)) {
1535 return;
1536 }
1537 }
1538
1539 #ifndef PRODUCT
1540 // This nmethod was not unloaded; check below that all CompiledICs
1541 // refer to marked oops.
1542 {
1543 RelocIterator iter(this, low_boundary);
1544 while (iter.next()) {
1545 if (iter.type() == relocInfo::virtual_call_type) {
1546 CompiledIC *ic = CompiledIC_at(iter.reloc());
1547 oop ic_oop = ic->cached_oop();
1548 assert(ic_oop == NULL || is_alive->do_object_b(ic_oop),
1549 "Found unmarked ic_oop in reachable nmethod");
1550 }
1551 }
1552 }
1553 #endif // !PRODUCT
1554 }
1555
1556 // This method is called twice during GC -- once while
1557 // tracing the "active" nmethods on thread stacks during
1558 // the (strong) marking phase, and then again when walking
1559 // the code cache contents during the weak roots processing
1560 // phase. The two uses are distinguished by means of the
1561 // 'do_strong_roots_only' flag, which is true in the first
1562 // case. We want to walk the weak roots in the nmethod
1563 // only in the second case. The weak roots in the nmethod
1564 // are the oops in the ExceptionCache and the InlineCache
1565 // oops.
1566 void nmethod::oops_do(OopClosure* f, bool do_strong_roots_only) {
1567 // make sure the oops ready to receive visitors
1568 assert(!is_zombie() && !is_unloaded(),
1569 "should not call follow on zombie or unloaded nmethod");
1570
1571 // If the method is not entrant or zombie then a JMP is plastered over the
1572 // first few bytes. If an oop in the old code was there, that oop
1573 // should not get GC'd. Skip the first few bytes of oops on
1574 // not-entrant methods.
1575 address low_boundary = verified_entry_point();
1576 if (is_not_entrant()) {
1577 low_boundary += NativeJump::instruction_size;
1578 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1579 // (See comment above.)
1580 }
1581
1582 // Compiled code
1583 f->do_oop((oop*) &_method);
1584 if (!do_strong_roots_only) {
1585 // weak roots processing phase -- update ExceptionCache oops
1586 ExceptionCache* ec = exception_cache();
1587 while(ec != NULL) {
1588 f->do_oop((oop*)ec->exception_type_addr());
1589 ec = ec->next();
1590 }
1591 } // Else strong roots phase -- skip oops in ExceptionCache
1592
1593 RelocIterator iter(this, low_boundary);
1594
1595 while (iter.next()) {
1596 if (iter.type() == relocInfo::oop_type ) {
1597 oop_Relocation* r = iter.oop_reloc();
1598 // In this loop, we must only follow those oops directly embedded in
1599 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1600 assert(1 == (r->oop_is_immediate()) +
1601 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1602 "oop must be found in exactly one place");
1603 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1604 f->do_oop(r->oop_addr());
1605 }
1606 }
1607 }
1608
1609 // Scopes
1610 // This includes oop constants not inlined in the code stream.
1611 for (oop* p = oops_begin(); p < oops_end(); p++) {
1612 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1613 f->do_oop(p);
1614 }
1615 }
1616
1617 #define NMETHOD_SENTINEL ((nmethod*)badAddress)
1618
1619 nmethod* volatile nmethod::_oops_do_mark_nmethods;
1620
1621 // An nmethod is "marked" if its _mark_link is set non-null.
1622 // Even if it is the end of the linked list, it will have a non-null link value,
1623 // as long as it is on the list.
1624 // This code must be MP safe, because it is used from parallel GC passes.
1625 bool nmethod::test_set_oops_do_mark() {
1626 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");
1627 nmethod* observed_mark_link = _oops_do_mark_link;
1628 if (observed_mark_link == NULL) {
1629 // Claim this nmethod for this thread to mark.
1630 observed_mark_link = (nmethod*)
1631 Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_link, NULL);
1632 if (observed_mark_link == NULL) {
1633
1634 // Atomically append this nmethod (now claimed) to the head of the list:
1635 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods;
1636 for (;;) {
1637 nmethod* required_mark_nmethods = observed_mark_nmethods;
1638 _oops_do_mark_link = required_mark_nmethods;
1639 observed_mark_nmethods = (nmethod*)
1640 Atomic::cmpxchg_ptr(this, &_oops_do_mark_nmethods, required_mark_nmethods);
1641 if (observed_mark_nmethods == required_mark_nmethods)
1642 break;
1643 }
1644 // Mark was clear when we first saw this guy.
1645 NOT_PRODUCT(if (TraceScavenge) print_on(tty, "oops_do, mark\n"));
1646 return false;
1647 }
1648 }
1649 // On fall through, another racing thread marked this nmethod before we did.
1650 return true;
1651 }
1652
1653 void nmethod::oops_do_marking_prologue() {
1654 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("[oops_do_marking_prologue"));
1655 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row");
1656 // We use cmpxchg_ptr instead of regular assignment here because the user
1657 // may fork a bunch of threads, and we need them all to see the same state.
1658 void* observed = Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, NULL);
1659 guarantee(observed == NULL, "no races in this sequential code");
1660 }
1661
1662 void nmethod::oops_do_marking_epilogue() {
1663 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row");
1664 nmethod* cur = _oops_do_mark_nmethods;
1665 while (cur != NMETHOD_SENTINEL) {
1666 assert(cur != NULL, "not NULL-terminated");
1667 nmethod* next = cur->_oops_do_mark_link;
1668 cur->_oops_do_mark_link = NULL;
1669 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark\n"));
1670 cur = next;
1671 }
1672 void* required = _oops_do_mark_nmethods;
1673 void* observed = Atomic::cmpxchg_ptr(NULL, &_oops_do_mark_nmethods, required);
1674 guarantee(observed == required, "no races in this sequential code");
1675 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("oops_do_marking_epilogue]"));
1676 }
1677
1678 class DetectScavengeRoot: public OopClosure {
1679 bool _detected_scavenge_root;
1680 public:
1681 DetectScavengeRoot() : _detected_scavenge_root(false)
1682 { NOT_PRODUCT(_print_nm = NULL); }
1683 bool detected_scavenge_root() { return _detected_scavenge_root; }
1684 virtual void do_oop(oop* p) {
1685 if ((*p) != NULL && (*p)->is_scavengable()) {
1686 NOT_PRODUCT(maybe_print(p));
1687 _detected_scavenge_root = true;
1688 }
1689 }
1690 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
1691
1692 #ifndef PRODUCT
1693 nmethod* _print_nm;
1694 void maybe_print(oop* p) {
1695 if (_print_nm == NULL) return;
1696 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root");
1697 tty->print_cr(""PTR_FORMAT"[offset=%d] detected non-perm oop "PTR_FORMAT" (found at "PTR_FORMAT")",
1698 _print_nm, (int)((intptr_t)p - (intptr_t)_print_nm),
1699 (intptr_t)(*p), (intptr_t)p);
1700 (*p)->print();
1701 }
1702 #endif //PRODUCT
1703 };
1704
1705 bool nmethod::detect_scavenge_root_oops() {
1706 DetectScavengeRoot detect_scavenge_root;
1707 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this);
1708 oops_do(&detect_scavenge_root);
1709 return detect_scavenge_root.detected_scavenge_root();
1710 }
1711
1712 // Method that knows how to preserve outgoing arguments at call. This method must be
1713 // called with a frame corresponding to a Java invoke
1714 void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) {
1715 if (!method()->is_native()) {
1716 SimpleScopeDesc ssd(this, fr.pc());
1717 Bytecode_invoke* call = Bytecode_invoke_at(ssd.method(), ssd.bci());
1718 bool is_static = call->is_invokestatic();
1719 symbolOop signature = call->signature();
1720 fr.oops_compiled_arguments_do(signature, is_static, reg_map, f);
1721 }
1722 }
1723
1724
1725 oop nmethod::embeddedOop_at(u_char* p) {
1726 RelocIterator iter(this, p, p + oopSize);
1727 while (iter.next())
1728 if (iter.type() == relocInfo::oop_type) {
1729 return iter.oop_reloc()->oop_value();
1730 }
1731 return NULL;
1732 }
1733
1734
1735 inline bool includes(void* p, void* from, void* to) {
1736 return from <= p && p < to;
1737 }
1738
1739
1740 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
1741 assert(count >= 2, "must be sentinel values, at least");
1742
1743 #ifdef ASSERT
1744 // must be sorted and unique; we do a binary search in find_pc_desc()
1745 int prev_offset = pcs[0].pc_offset();
1746 assert(prev_offset == PcDesc::lower_offset_limit,
1747 "must start with a sentinel");
1748 for (int i = 1; i < count; i++) {
1749 int this_offset = pcs[i].pc_offset();
1750 assert(this_offset > prev_offset, "offsets must be sorted");
1751 prev_offset = this_offset;
1752 }
1753 assert(prev_offset == PcDesc::upper_offset_limit,
1754 "must end with a sentinel");
1755 #endif //ASSERT
1756
1757 int size = count * sizeof(PcDesc);
1758 assert(scopes_pcs_size() >= size, "oob");
1759 memcpy(scopes_pcs_begin(), pcs, size);
1760
1761 // Adjust the final sentinel downward.
1762 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
1763 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
1764 last_pc->set_pc_offset(instructions_size() + 1);
1765 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
1766 // Fill any rounding gaps with copies of the last record.
1767 last_pc[1] = last_pc[0];
1768 }
1769 // The following assert could fail if sizeof(PcDesc) is not
1770 // an integral multiple of oopSize (the rounding term).
1771 // If it fails, change the logic to always allocate a multiple
1772 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
1773 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
1774 }
1775
1776 void nmethod::copy_scopes_data(u_char* buffer, int size) {
1777 assert(scopes_data_size() >= size, "oob");
1778 memcpy(scopes_data_begin(), buffer, size);
1779 }
1780
1781
1782 #ifdef ASSERT
1783 static PcDesc* linear_search(nmethod* nm, int pc_offset, bool approximate) {
1784 PcDesc* lower = nm->scopes_pcs_begin();
1785 PcDesc* upper = nm->scopes_pcs_end();
1786 lower += 1; // exclude initial sentinel
1787 PcDesc* res = NULL;
1788 for (PcDesc* p = lower; p < upper; p++) {
1789 NOT_PRODUCT(--nmethod_stats.pc_desc_tests); // don't count this call to match_desc
1790 if (match_desc(p, pc_offset, approximate)) {
1791 if (res == NULL)
1792 res = p;
1793 else
1794 res = (PcDesc*) badAddress;
1795 }
1796 }
1797 return res;
1798 }
1799 #endif
1800
1801
1802 // Finds a PcDesc with real-pc equal to "pc"
1803 PcDesc* nmethod::find_pc_desc_internal(address pc, bool approximate) {
1804 address base_address = instructions_begin();
1805 if ((pc < base_address) ||
1806 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
1807 return NULL; // PC is wildly out of range
1808 }
1809 int pc_offset = (int) (pc - base_address);
1810
1811 // Check the PcDesc cache if it contains the desired PcDesc
1812 // (This as an almost 100% hit rate.)
1813 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
1814 if (res != NULL) {
1815 assert(res == linear_search(this, pc_offset, approximate), "cache ok");
1816 return res;
1817 }
1818
1819 // Fallback algorithm: quasi-linear search for the PcDesc
1820 // Find the last pc_offset less than the given offset.
1821 // The successor must be the required match, if there is a match at all.
1822 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
1823 PcDesc* lower = scopes_pcs_begin();
1824 PcDesc* upper = scopes_pcs_end();
1825 upper -= 1; // exclude final sentinel
1826 if (lower >= upper) return NULL; // native method; no PcDescs at all
1827
1828 #define assert_LU_OK \
1829 /* invariant on lower..upper during the following search: */ \
1830 assert(lower->pc_offset() < pc_offset, "sanity"); \
1831 assert(upper->pc_offset() >= pc_offset, "sanity")
1832 assert_LU_OK;
1833
1834 // Use the last successful return as a split point.
1835 PcDesc* mid = _pc_desc_cache.last_pc_desc();
1836 NOT_PRODUCT(++nmethod_stats.pc_desc_searches);
1837 if (mid->pc_offset() < pc_offset) {
1838 lower = mid;
1839 } else {
1840 upper = mid;
1841 }
1842
1843 // Take giant steps at first (4096, then 256, then 16, then 1)
1844 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
1845 const int RADIX = (1 << LOG2_RADIX);
1846 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
1847 while ((mid = lower + step) < upper) {
1848 assert_LU_OK;
1849 NOT_PRODUCT(++nmethod_stats.pc_desc_searches);
1850 if (mid->pc_offset() < pc_offset) {
1851 lower = mid;
1852 } else {
1853 upper = mid;
1854 break;
1855 }
1856 }
1857 assert_LU_OK;
1858 }
1859
1860 // Sneak up on the value with a linear search of length ~16.
1861 while (true) {
1862 assert_LU_OK;
1863 mid = lower + 1;
1864 NOT_PRODUCT(++nmethod_stats.pc_desc_searches);
1865 if (mid->pc_offset() < pc_offset) {
1866 lower = mid;
1867 } else {
1868 upper = mid;
1869 break;
1870 }
1871 }
1872 #undef assert_LU_OK
1873
1874 if (match_desc(upper, pc_offset, approximate)) {
1875 assert(upper == linear_search(this, pc_offset, approximate), "search ok");
1876 _pc_desc_cache.add_pc_desc(upper);
1877 return upper;
1878 } else {
1879 assert(NULL == linear_search(this, pc_offset, approximate), "search ok");
1880 return NULL;
1881 }
1882 }
1883
1884
1885 bool nmethod::check_all_dependencies() {
1886 bool found_check = false;
1887 // wholesale check of all dependencies
1888 for (Dependencies::DepStream deps(this); deps.next(); ) {
1889 if (deps.check_dependency() != NULL) {
1890 found_check = true;
1891 NOT_DEBUG(break);
1892 }
1893 }
1894 return found_check; // tell caller if we found anything
1895 }
1896
1897 bool nmethod::check_dependency_on(DepChange& changes) {
1898 // What has happened:
1899 // 1) a new class dependee has been added
1900 // 2) dependee and all its super classes have been marked
1901 bool found_check = false; // set true if we are upset
1902 for (Dependencies::DepStream deps(this); deps.next(); ) {
1903 // Evaluate only relevant dependencies.
1904 if (deps.spot_check_dependency_at(changes) != NULL) {
1905 found_check = true;
1906 NOT_DEBUG(break);
1907 }
1908 }
1909 return found_check;
1910 }
1911
1912 bool nmethod::is_evol_dependent_on(klassOop dependee) {
1913 instanceKlass *dependee_ik = instanceKlass::cast(dependee);
1914 objArrayOop dependee_methods = dependee_ik->methods();
1915 for (Dependencies::DepStream deps(this); deps.next(); ) {
1916 if (deps.type() == Dependencies::evol_method) {
1917 methodOop method = deps.method_argument(0);
1918 for (int j = 0; j < dependee_methods->length(); j++) {
1919 if ((methodOop) dependee_methods->obj_at(j) == method) {
1920 // RC_TRACE macro has an embedded ResourceMark
1921 RC_TRACE(0x01000000,
1922 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)",
1923 _method->method_holder()->klass_part()->external_name(),
1924 _method->name()->as_C_string(),
1925 _method->signature()->as_C_string(), compile_id(),
1926 method->method_holder()->klass_part()->external_name(),
1927 method->name()->as_C_string(),
1928 method->signature()->as_C_string()));
1929 if (TraceDependencies || LogCompilation)
1930 deps.log_dependency(dependee);
1931 return true;
1932 }
1933 }
1934 }
1935 }
1936 return false;
1937 }
1938
1939 // Called from mark_for_deoptimization, when dependee is invalidated.
1940 bool nmethod::is_dependent_on_method(methodOop dependee) {
1941 for (Dependencies::DepStream deps(this); deps.next(); ) {
1942 if (deps.type() != Dependencies::evol_method)
1943 continue;
1944 methodOop method = deps.method_argument(0);
1945 if (method == dependee) return true;
1946 }
1947 return false;
1948 }
1949
1950
1951 bool nmethod::is_patchable_at(address instr_addr) {
1952 assert (code_contains(instr_addr), "wrong nmethod used");
1953 if (is_zombie()) {
1954 // a zombie may never be patched
1955 return false;
1956 }
1957 return true;
1958 }
1959
1960
1961 address nmethod::continuation_for_implicit_exception(address pc) {
1962 // Exception happened outside inline-cache check code => we are inside
1963 // an active nmethod => use cpc to determine a return address
1964 int exception_offset = pc - instructions_begin();
1965 int cont_offset = ImplicitExceptionTable(this).at( exception_offset );
1966 #ifdef ASSERT
1967 if (cont_offset == 0) {
1968 Thread* thread = ThreadLocalStorage::get_thread_slow();
1969 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
1970 HandleMark hm(thread);
1971 ResourceMark rm(thread);
1972 CodeBlob* cb = CodeCache::find_blob(pc);
1973 assert(cb != NULL && cb == this, "");
1974 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, pc);
1975 print();
1976 method()->print_codes();
1977 print_code();
1978 print_pcs();
1979 }
1980 #endif
1981 guarantee(cont_offset != 0, "unhandled implicit exception in compiled code");
1982 return instructions_begin() + cont_offset;
1983 }
1984
1985
1986
1987 void nmethod_init() {
1988 // make sure you didn't forget to adjust the filler fields
1989 assert(sizeof(nmFlags) <= 4, "nmFlags occupies more than a word");
1990 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
1991 }
1992
1993
1994 //-------------------------------------------------------------------------------------------
1995
1996
1997 // QQQ might we make this work from a frame??
1998 nmethodLocker::nmethodLocker(address pc) {
1999 CodeBlob* cb = CodeCache::find_blob(pc);
2000 guarantee(cb != NULL && cb->is_nmethod(), "bad pc for a nmethod found");
2001 _nm = (nmethod*)cb;
2002 lock_nmethod(_nm);
2003 }
2004
2005 void nmethodLocker::lock_nmethod(nmethod* nm) {
2006 if (nm == NULL) return;
2007 Atomic::inc(&nm->_lock_count);
2008 guarantee(!nm->is_zombie(), "cannot lock a zombie method");
2009 }
2010
2011 void nmethodLocker::unlock_nmethod(nmethod* nm) {
2012 if (nm == NULL) return;
2013 Atomic::dec(&nm->_lock_count);
2014 guarantee(nm->_lock_count >= 0, "unmatched nmethod lock/unlock");
2015 }
2016
2017 bool nmethod::is_deopt_pc(address pc) {
2018 bool ret = pc == deopt_handler_begin();
2019 return ret;
2020 }
2021
2022
2023 // -----------------------------------------------------------------------------
2024 // Verification
2025
2026 class VerifyOopsClosure: public OopClosure {
2027 nmethod* _nm;
2028 bool _ok;
2029 public:
2030 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
2031 bool ok() { return _ok; }
2032 virtual void do_oop(oop* p) {
2033 if ((*p) == NULL || (*p)->is_oop()) return;
2034 if (_ok) {
2035 _nm->print_nmethod(true);
2036 _ok = false;
2037 }
2038 tty->print_cr("*** non-oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)",
2039 (intptr_t)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm));
2040 }
2041 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2042 };
2043
2044 void nmethod::verify() {
2045
2046 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant
2047 // seems odd.
2048
2049 if( is_zombie() || is_not_entrant() )
2050 return;
2051
2052 // Make sure all the entry points are correctly aligned for patching.
2053 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
2054
2055 assert(method()->is_oop(), "must be valid");
2056
2057 ResourceMark rm;
2058
2059 if (!CodeCache::contains(this)) {
2060 fatal1("nmethod at " INTPTR_FORMAT " not in zone", this);
2061 }
2062
2063 if(is_native_method() )
2064 return;
2065
2066 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
2067 if (nm != this) {
2068 fatal1("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", this);
2069 }
2070
2071 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2072 if (! p->verify(this)) {
2073 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", this);
2074 }
2075 }
2076
2077 VerifyOopsClosure voc(this);
2078 oops_do(&voc);
2079 assert(voc.ok(), "embedded oops must be OK");
2080 verify_scavenge_root_oops();
2081
2082 verify_scopes();
2083 }
2084
2085
2086 void nmethod::verify_interrupt_point(address call_site) {
2087 // This code does not work in release mode since
2088 // owns_lock only is available in debug mode.
2089 CompiledIC* ic = NULL;
2090 Thread *cur = Thread::current();
2091 if (CompiledIC_lock->owner() == cur ||
2092 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) &&
2093 SafepointSynchronize::is_at_safepoint())) {
2094 ic = CompiledIC_at(call_site);
2095 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
2096 } else {
2097 MutexLocker ml_verify (CompiledIC_lock);
2098 ic = CompiledIC_at(call_site);
2099 }
2100 PcDesc* pd = pc_desc_at(ic->end_of_call());
2101 assert(pd != NULL, "PcDesc must exist");
2102 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(),
2103 pd->obj_decode_offset(), pd->should_reexecute());
2104 !sd->is_top(); sd = sd->sender()) {
2105 sd->verify();
2106 }
2107 }
2108
2109 void nmethod::verify_scopes() {
2110 if( !method() ) return; // Runtime stubs have no scope
2111 if (method()->is_native()) return; // Ignore stub methods.
2112 // iterate through all interrupt point
2113 // and verify the debug information is valid.
2114 RelocIterator iter((nmethod*)this);
2115 while (iter.next()) {
2116 address stub = NULL;
2117 switch (iter.type()) {
2118 case relocInfo::virtual_call_type:
2119 verify_interrupt_point(iter.addr());
2120 break;
2121 case relocInfo::opt_virtual_call_type:
2122 stub = iter.opt_virtual_call_reloc()->static_stub();
2123 verify_interrupt_point(iter.addr());
2124 break;
2125 case relocInfo::static_call_type:
2126 stub = iter.static_call_reloc()->static_stub();
2127 //verify_interrupt_point(iter.addr());
2128 break;
2129 case relocInfo::runtime_call_type:
2130 address destination = iter.reloc()->value();
2131 // Right now there is no way to find out which entries support
2132 // an interrupt point. It would be nice if we had this
2133 // information in a table.
2134 break;
2135 }
2136 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section");
2137 }
2138 }
2139
2140
2141 // -----------------------------------------------------------------------------
2142 // Non-product code
2143 #ifndef PRODUCT
2144
2145 class DebugScavengeRoot: public OopClosure {
2146 nmethod* _nm;
2147 bool _ok;
2148 public:
2149 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { }
2150 bool ok() { return _ok; }
2151 virtual void do_oop(oop* p) {
2152 if ((*p) == NULL || !(*p)->is_scavengable()) return;
2153 if (_ok) {
2154 _nm->print_nmethod(true);
2155 _ok = false;
2156 }
2157 tty->print_cr("*** non-perm oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)",
2158 (intptr_t)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm));
2159 (*p)->print();
2160 }
2161 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2162 };
2163
2164 void nmethod::verify_scavenge_root_oops() {
2165 if (!on_scavenge_root_list()) {
2166 // Actually look inside, to verify the claim that it's clean.
2167 DebugScavengeRoot debug_scavenge_root(this);
2168 oops_do(&debug_scavenge_root);
2169 if (!debug_scavenge_root.ok())
2170 fatal("found an unadvertised bad non-perm oop in the code cache");
2171 }
2172 assert(scavenge_root_not_marked(), "");
2173 }
2174
2175 #endif // PRODUCT
2176
2177 // Printing operations
2178
2179 void nmethod::print() const {
2180 ResourceMark rm;
2181 ttyLocker ttyl; // keep the following output all in one block
2182
2183 tty->print("Compiled ");
2184
2185 if (is_compiled_by_c1()) {
2186 tty->print("(c1) ");
2187 } else if (is_compiled_by_c2()) {
2188 tty->print("(c2) ");
2189 } else {
2190 tty->print("(nm) ");
2191 }
2192
2193 print_on(tty, "nmethod");
2194 tty->cr();
2195 if (WizardMode) {
2196 tty->print("((nmethod*) "INTPTR_FORMAT ") ", this);
2197 tty->print(" for method " INTPTR_FORMAT , (address)method());
2198 tty->print(" { ");
2199 if (version()) tty->print("v%d ", version());
2200 if (level()) tty->print("l%d ", level());
2201 if (is_in_use()) tty->print("in_use ");
2202 if (is_not_entrant()) tty->print("not_entrant ");
2203 if (is_zombie()) tty->print("zombie ");
2204 if (is_unloaded()) tty->print("unloaded ");
2205 if (on_scavenge_root_list()) tty->print("scavenge_root ");
2206 tty->print_cr("}:");
2207 }
2208 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2209 (address)this,
2210 (address)this + size(),
2211 size());
2212 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2213 relocation_begin(),
2214 relocation_end(),
2215 relocation_size());
2216 if (code_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2217 code_begin(),
2218 code_end(),
2219 code_size());
2220 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2221 stub_begin(),
2222 stub_end(),
2223 stub_size());
2224 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2225 consts_begin(),
2226 consts_end(),
2227 consts_size());
2228 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2229 scopes_data_begin(),
2230 scopes_data_end(),
2231 scopes_data_size());
2232 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2233 scopes_pcs_begin(),
2234 scopes_pcs_end(),
2235 scopes_pcs_size());
2236 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2237 dependencies_begin(),
2238 dependencies_end(),
2239 dependencies_size());
2240 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2241 handler_table_begin(),
2242 handler_table_end(),
2243 handler_table_size());
2244 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2245 nul_chk_table_begin(),
2246 nul_chk_table_end(),
2247 nul_chk_table_size());
2248 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2249 oops_begin(),
2250 oops_end(),
2251 oops_size());
2252 }
2253
2254 void nmethod::print_code() {
2255 HandleMark hm;
2256 ResourceMark m;
2257 Disassembler::decode(this);
2258 }
2259
2260
2261 #ifndef PRODUCT
2262
2263 void nmethod::print_scopes() {
2264 // Find the first pc desc for all scopes in the code and print it.
2265 ResourceMark rm;
2266 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2267 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
2268 continue;
2269
2270 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
2271 sd->print_on(tty, p);
2272 }
2273 }
2274
2275 void nmethod::print_dependencies() {
2276 ResourceMark rm;
2277 ttyLocker ttyl; // keep the following output all in one block
2278 tty->print_cr("Dependencies:");
2279 for (Dependencies::DepStream deps(this); deps.next(); ) {
2280 deps.print_dependency();
2281 klassOop ctxk = deps.context_type();
2282 if (ctxk != NULL) {
2283 Klass* k = Klass::cast(ctxk);
2284 if (k->oop_is_instance() && ((instanceKlass*)k)->is_dependent_nmethod(this)) {
2285 tty->print_cr(" [nmethod<=klass]%s", k->external_name());
2286 }
2287 }
2288 deps.log_dependency(); // put it into the xml log also
2289 }
2290 }
2291
2292
2293 void nmethod::print_relocations() {
2294 ResourceMark m; // in case methods get printed via the debugger
2295 tty->print_cr("relocations:");
2296 RelocIterator iter(this);
2297 iter.print();
2298 if (UseRelocIndex) {
2299 jint* index_end = (jint*)relocation_end() - 1;
2300 jint index_size = *index_end;
2301 jint* index_start = (jint*)( (address)index_end - index_size );
2302 tty->print_cr(" index @" INTPTR_FORMAT ": index_size=%d", index_start, index_size);
2303 if (index_size > 0) {
2304 jint* ip;
2305 for (ip = index_start; ip+2 <= index_end; ip += 2)
2306 tty->print_cr(" (%d %d) addr=" INTPTR_FORMAT " @" INTPTR_FORMAT,
2307 ip[0],
2308 ip[1],
2309 header_end()+ip[0],
2310 relocation_begin()-1+ip[1]);
2311 for (; ip < index_end; ip++)
2312 tty->print_cr(" (%d ?)", ip[0]);
2313 tty->print_cr(" @" INTPTR_FORMAT ": index_size=%d", ip, *ip++);
2314 tty->print_cr("reloc_end @" INTPTR_FORMAT ":", ip);
2315 }
2316 }
2317 }
2318
2319
2320 void nmethod::print_pcs() {
2321 ResourceMark m; // in case methods get printed via debugger
2322 tty->print_cr("pc-bytecode offsets:");
2323 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2324 p->print(this);
2325 }
2326 }
2327
2328 #endif // PRODUCT
2329
2330 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
2331 RelocIterator iter(this, begin, end);
2332 bool have_one = false;
2333 while (iter.next()) {
2334 have_one = true;
2335 switch (iter.type()) {
2336 case relocInfo::none: return "no_reloc";
2337 case relocInfo::oop_type: {
2338 stringStream st;
2339 oop_Relocation* r = iter.oop_reloc();
2340 oop obj = r->oop_value();
2341 st.print("oop(");
2342 if (obj == NULL) st.print("NULL");
2343 else obj->print_value_on(&st);
2344 st.print(")");
2345 return st.as_string();
2346 }
2347 case relocInfo::virtual_call_type: return "virtual_call";
2348 case relocInfo::opt_virtual_call_type: return "optimized virtual_call";
2349 case relocInfo::static_call_type: return "static_call";
2350 case relocInfo::static_stub_type: return "static_stub";
2351 case relocInfo::runtime_call_type: return "runtime_call";
2352 case relocInfo::external_word_type: return "external_word";
2353 case relocInfo::internal_word_type: return "internal_word";
2354 case relocInfo::section_word_type: return "section_word";
2355 case relocInfo::poll_type: return "poll";
2356 case relocInfo::poll_return_type: return "poll_return";
2357 case relocInfo::type_mask: return "type_bit_mask";
2358 }
2359 }
2360 return have_one ? "other" : NULL;
2361 }
2362
2363 // Return a the last scope in (begin..end]
2364 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
2365 PcDesc* p = pc_desc_near(begin+1);
2366 if (p != NULL && p->real_pc(this) <= end) {
2367 return new ScopeDesc(this, p->scope_decode_offset(),
2368 p->obj_decode_offset(), p->should_reexecute());
2369 }
2370 return NULL;
2371 }
2372
2373 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) {
2374 // First, find an oopmap in (begin, end].
2375 // We use the odd half-closed interval so that oop maps and scope descs
2376 // which are tied to the byte after a call are printed with the call itself.
2377 address base = instructions_begin();
2378 OopMapSet* oms = oop_maps();
2379 if (oms != NULL) {
2380 for (int i = 0, imax = oms->size(); i < imax; i++) {
2381 OopMap* om = oms->at(i);
2382 address pc = base + om->offset();
2383 if (pc > begin) {
2384 if (pc <= end) {
2385 st->move_to(column);
2386 st->print("; ");
2387 om->print_on(st);
2388 }
2389 break;
2390 }
2391 }
2392 }
2393
2394 // Print any debug info present at this pc.
2395 ScopeDesc* sd = scope_desc_in(begin, end);
2396 if (sd != NULL) {
2397 st->move_to(column);
2398 if (sd->bci() == SynchronizationEntryBCI) {
2399 st->print(";*synchronization entry");
2400 } else {
2401 if (sd->method().is_null()) {
2402 st->print("method is NULL");
2403 } else if (sd->method()->is_native()) {
2404 st->print("method is native");
2405 } else {
2406 address bcp = sd->method()->bcp_from(sd->bci());
2407 Bytecodes::Code bc = Bytecodes::java_code_at(bcp);
2408 st->print(";*%s", Bytecodes::name(bc));
2409 switch (bc) {
2410 case Bytecodes::_invokevirtual:
2411 case Bytecodes::_invokespecial:
2412 case Bytecodes::_invokestatic:
2413 case Bytecodes::_invokeinterface:
2414 {
2415 Bytecode_invoke* invoke = Bytecode_invoke_at(sd->method(), sd->bci());
2416 st->print(" ");
2417 if (invoke->name() != NULL)
2418 invoke->name()->print_symbol_on(st);
2419 else
2420 st->print("<UNKNOWN>");
2421 break;
2422 }
2423 case Bytecodes::_getfield:
2424 case Bytecodes::_putfield:
2425 case Bytecodes::_getstatic:
2426 case Bytecodes::_putstatic:
2427 {
2428 methodHandle sdm = sd->method();
2429 Bytecode_field* field = Bytecode_field_at(sdm(), sdm->bcp_from(sd->bci()));
2430 constantPoolOop sdmc = sdm->constants();
2431 symbolOop name = sdmc->name_ref_at(field->index());
2432 st->print(" ");
2433 if (name != NULL)
2434 name->print_symbol_on(st);
2435 else
2436 st->print("<UNKNOWN>");
2437 }
2438 }
2439 }
2440 }
2441
2442 // Print all scopes
2443 for (;sd != NULL; sd = sd->sender()) {
2444 st->move_to(column);
2445 st->print("; -");
2446 if (sd->method().is_null()) {
2447 st->print("method is NULL");
2448 } else {
2449 sd->method()->print_short_name(st);
2450 }
2451 int lineno = sd->method()->line_number_from_bci(sd->bci());
2452 if (lineno != -1) {
2453 st->print("@%d (line %d)", sd->bci(), lineno);
2454 } else {
2455 st->print("@%d", sd->bci());
2456 }
2457 st->cr();
2458 }
2459 }
2460
2461 // Print relocation information
2462 const char* str = reloc_string_for(begin, end);
2463 if (str != NULL) {
2464 if (sd != NULL) st->cr();
2465 st->move_to(column);
2466 st->print("; {%s}", str);
2467 }
2468 int cont_offset = ImplicitExceptionTable(this).at(begin - instructions_begin());
2469 if (cont_offset != 0) {
2470 st->move_to(column);
2471 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, instructions_begin() + cont_offset);
2472 }
2473
2474 }
2475
2476 #ifndef PRODUCT
2477
2478 void nmethod::print_value_on(outputStream* st) const {
2479 print_on(st, "nmethod");
2480 }
2481
2482 void nmethod::print_calls(outputStream* st) {
2483 RelocIterator iter(this);
2484 while (iter.next()) {
2485 switch (iter.type()) {
2486 case relocInfo::virtual_call_type:
2487 case relocInfo::opt_virtual_call_type: {
2488 VerifyMutexLocker mc(CompiledIC_lock);
2489 CompiledIC_at(iter.reloc())->print();
2490 break;
2491 }
2492 case relocInfo::static_call_type:
2493 st->print_cr("Static call at " INTPTR_FORMAT, iter.reloc()->addr());
2494 compiledStaticCall_at(iter.reloc())->print();
2495 break;
2496 }
2497 }
2498 }
2499
2500 void nmethod::print_handler_table() {
2501 ExceptionHandlerTable(this).print();
2502 }
2503
2504 void nmethod::print_nul_chk_table() {
2505 ImplicitExceptionTable(this).print(instructions_begin());
2506 }
2507
2508 void nmethod::print_statistics() {
2509 ttyLocker ttyl;
2510 if (xtty != NULL) xtty->head("statistics type='nmethod'");
2511 nmethod_stats.print_native_nmethod_stats();
2512 nmethod_stats.print_nmethod_stats();
2513 DebugInformationRecorder::print_statistics();
2514 nmethod_stats.print_pc_stats();
2515 Dependencies::print_statistics();
2516 if (xtty != NULL) xtty->tail("statistics");
2517 }
2518
2519 #endif // PRODUCT