1 /*
2 * Copyright 1997-2010 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 (compiler() == NULL || method() == NULL) return false; // can happen during debug printing
60 if (is_native_method()) return false;
61 return compiler()->is_c1();
62 }
63 bool nmethod::is_compiled_by_c2() const {
64 if (compiler() == NULL || method() == NULL) return false; // can happen during debug printing
65 if (is_native_method()) return false;
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 (is_osr_method()) return "osr";
418 if (method() != NULL && is_native_method()) return "c2n";
419 return NULL;
420 }
421
422 // %%% This variable is no longer used?
423 int nmethod::_zombie_instruction_size = NativeJump::instruction_size;
424
425
426 nmethod* nmethod::new_native_nmethod(methodHandle method,
427 CodeBuffer *code_buffer,
428 int vep_offset,
429 int frame_complete,
430 int frame_size,
431 ByteSize basic_lock_owner_sp_offset,
432 ByteSize basic_lock_sp_offset,
433 OopMapSet* oop_maps) {
434 // create nmethod
435 nmethod* nm = NULL;
436 {
437 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
438 int native_nmethod_size = allocation_size(code_buffer, sizeof(nmethod));
439 CodeOffsets offsets;
440 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
441 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
442 nm = new (native_nmethod_size)
443 nmethod(method(), native_nmethod_size, &offsets,
444 code_buffer, frame_size,
445 basic_lock_owner_sp_offset, basic_lock_sp_offset,
446 oop_maps);
447 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_native_nmethod(nm));
448 if (PrintAssembly && nm != NULL)
449 Disassembler::decode(nm);
450 }
451 // verify nmethod
452 debug_only(if (nm) nm->verify();) // might block
453
454 if (nm != NULL) {
455 nm->log_new_nmethod();
456 }
457
458 return nm;
459 }
460
461 #ifdef HAVE_DTRACE_H
462 nmethod* nmethod::new_dtrace_nmethod(methodHandle method,
463 CodeBuffer *code_buffer,
464 int vep_offset,
465 int trap_offset,
466 int frame_complete,
467 int frame_size) {
468 // create nmethod
469 nmethod* nm = NULL;
470 {
471 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
472 int nmethod_size = allocation_size(code_buffer, sizeof(nmethod));
473 CodeOffsets offsets;
474 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
475 offsets.set_value(CodeOffsets::Dtrace_trap, trap_offset);
476 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
477
478 nm = new (nmethod_size) nmethod(method(), nmethod_size, &offsets, code_buffer, frame_size);
479
480 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_nmethod(nm));
481 if (PrintAssembly && nm != NULL)
482 Disassembler::decode(nm);
483 }
484 // verify nmethod
485 debug_only(if (nm) nm->verify();) // might block
486
487 if (nm != NULL) {
488 nm->log_new_nmethod();
489 }
490
491 return nm;
492 }
493
494 #endif // def HAVE_DTRACE_H
495
496 nmethod* nmethod::new_nmethod(methodHandle method,
497 int compile_id,
498 int entry_bci,
499 CodeOffsets* offsets,
500 int orig_pc_offset,
501 DebugInformationRecorder* debug_info,
502 Dependencies* dependencies,
503 CodeBuffer* code_buffer, int frame_size,
504 OopMapSet* oop_maps,
505 ExceptionHandlerTable* handler_table,
506 ImplicitExceptionTable* nul_chk_table,
507 AbstractCompiler* compiler,
508 int comp_level
509 )
510 {
511 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
512 // create nmethod
513 nmethod* nm = NULL;
514 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
515 int nmethod_size =
516 allocation_size(code_buffer, sizeof(nmethod))
517 + adjust_pcs_size(debug_info->pcs_size())
518 + round_to(dependencies->size_in_bytes() , oopSize)
519 + round_to(handler_table->size_in_bytes(), oopSize)
520 + round_to(nul_chk_table->size_in_bytes(), oopSize)
521 + round_to(debug_info->data_size() , oopSize);
522 nm = new (nmethod_size)
523 nmethod(method(), nmethod_size, compile_id, entry_bci, offsets,
524 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size,
525 oop_maps,
526 handler_table,
527 nul_chk_table,
528 compiler,
529 comp_level);
530 if (nm != NULL) {
531 // To make dependency checking during class loading fast, record
532 // the nmethod dependencies in the classes it is dependent on.
533 // This allows the dependency checking code to simply walk the
534 // class hierarchy above the loaded class, checking only nmethods
535 // which are dependent on those classes. The slow way is to
536 // check every nmethod for dependencies which makes it linear in
537 // the number of methods compiled. For applications with a lot
538 // classes the slow way is too slow.
539 for (Dependencies::DepStream deps(nm); deps.next(); ) {
540 klassOop klass = deps.context_type();
541 if (klass == NULL) continue; // ignore things like evol_method
542
543 // record this nmethod as dependent on this klass
544 instanceKlass::cast(klass)->add_dependent_nmethod(nm);
545 }
546 }
547 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_nmethod(nm));
548 if (PrintAssembly && nm != NULL)
549 Disassembler::decode(nm);
550 }
551
552 // verify nmethod
553 debug_only(if (nm) nm->verify();) // might block
554
555 if (nm != NULL) {
556 nm->log_new_nmethod();
557 }
558
559 // done
560 return nm;
561 }
562
563
564 // For native wrappers
565 nmethod::nmethod(
566 methodOop method,
567 int nmethod_size,
568 CodeOffsets* offsets,
569 CodeBuffer* code_buffer,
570 int frame_size,
571 ByteSize basic_lock_owner_sp_offset,
572 ByteSize basic_lock_sp_offset,
573 OopMapSet* oop_maps )
574 : CodeBlob("native nmethod", code_buffer, sizeof(nmethod),
575 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps),
576 _compiled_synchronized_native_basic_lock_owner_sp_offset(basic_lock_owner_sp_offset),
577 _compiled_synchronized_native_basic_lock_sp_offset(basic_lock_sp_offset)
578 {
579 {
580 debug_only(No_Safepoint_Verifier nsv;)
581 assert_locked_or_safepoint(CodeCache_lock);
582
583 NOT_PRODUCT(_has_debug_info = false);
584 _oops_do_mark_link = NULL;
585 _method = method;
586 _entry_bci = InvocationEntryBci;
587 _osr_link = NULL;
588 _scavenge_root_link = NULL;
589 _scavenge_root_state = 0;
590 _saved_nmethod_link = NULL;
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 _deoptimize_mh_offset = 0;
597 _orig_pc_offset = 0;
598 #ifdef HAVE_DTRACE_H
599 _trap_offset = 0;
600 #endif // def HAVE_DTRACE_H
601 _stub_offset = data_offset();
602 _consts_offset = data_offset();
603 _scopes_data_offset = data_offset();
604 _scopes_pcs_offset = _scopes_data_offset;
605 _dependencies_offset = _scopes_pcs_offset;
606 _handler_table_offset = _dependencies_offset;
607 _nul_chk_table_offset = _handler_table_offset;
608 _nmethod_end_offset = _nul_chk_table_offset;
609 _compile_id = 0; // default
610 _comp_level = CompLevel_none;
611 _entry_point = instructions_begin();
612 _verified_entry_point = instructions_begin() + offsets->value(CodeOffsets::Verified_Entry);
613 _osr_entry_point = NULL;
614 _exception_cache = NULL;
615 _pc_desc_cache.reset_to(NULL);
616
617 flags.clear();
618 flags.state = alive;
619 _markedForDeoptimization = 0;
620
621 _lock_count = 0;
622 _stack_traversal_mark = 0;
623
624 code_buffer->copy_oops_to(this);
625 debug_only(verify_scavenge_root_oops());
626 CodeCache::commit(this);
627 VTune::create_nmethod(this);
628 }
629
630 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
631 ttyLocker ttyl; // keep the following output all in one block
632 // This output goes directly to the tty, not the compiler log.
633 // To enable tools to match it up with the compilation activity,
634 // be sure to tag this tty output with the compile ID.
635 if (xtty != NULL) {
636 xtty->begin_head("print_native_nmethod");
637 xtty->method(_method);
638 xtty->stamp();
639 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
640 }
641 // print the header part first
642 print();
643 // then print the requested information
644 if (PrintNativeNMethods) {
645 print_code();
646 oop_maps->print();
647 }
648 if (PrintRelocations) {
649 print_relocations();
650 }
651 if (xtty != NULL) {
652 xtty->tail("print_native_nmethod");
653 }
654 }
655 Events::log("Create nmethod " INTPTR_FORMAT, this);
656 }
657
658 // For dtrace wrappers
659 #ifdef HAVE_DTRACE_H
660 nmethod::nmethod(
661 methodOop method,
662 int nmethod_size,
663 CodeOffsets* offsets,
664 CodeBuffer* code_buffer,
665 int frame_size)
666 : CodeBlob("dtrace nmethod", code_buffer, sizeof(nmethod),
667 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, NULL),
668 _compiled_synchronized_native_basic_lock_owner_sp_offset(in_ByteSize(-1)),
669 _compiled_synchronized_native_basic_lock_sp_offset(in_ByteSize(-1))
670 {
671 {
672 debug_only(No_Safepoint_Verifier nsv;)
673 assert_locked_or_safepoint(CodeCache_lock);
674
675 NOT_PRODUCT(_has_debug_info = false);
676 _oops_do_mark_link = NULL;
677 _method = method;
678 _entry_bci = InvocationEntryBci;
679 _osr_link = NULL;
680 _scavenge_root_link = NULL;
681 _scavenge_root_state = 0;
682 _compiler = NULL;
683 // We have no exception handler or deopt handler make the
684 // values something that will never match a pc like the nmethod vtable entry
685 _exception_offset = 0;
686 _deoptimize_offset = 0;
687 _deoptimize_mh_offset = 0;
688 _trap_offset = offsets->value(CodeOffsets::Dtrace_trap);
689 _orig_pc_offset = 0;
690 _stub_offset = data_offset();
691 _consts_offset = data_offset();
692 _scopes_data_offset = data_offset();
693 _scopes_pcs_offset = _scopes_data_offset;
694 _dependencies_offset = _scopes_pcs_offset;
695 _handler_table_offset = _dependencies_offset;
696 _nul_chk_table_offset = _handler_table_offset;
697 _nmethod_end_offset = _nul_chk_table_offset;
698 _compile_id = 0; // default
699 _comp_level = CompLevel_none;
700 _entry_point = instructions_begin();
701 _verified_entry_point = instructions_begin() + offsets->value(CodeOffsets::Verified_Entry);
702 _osr_entry_point = NULL;
703 _exception_cache = NULL;
704 _pc_desc_cache.reset_to(NULL);
705
706 flags.clear();
707 flags.state = alive;
708 _markedForDeoptimization = 0;
709
710 _lock_count = 0;
711 _stack_traversal_mark = 0;
712
713 code_buffer->copy_oops_to(this);
714 debug_only(verify_scavenge_root_oops());
715 CodeCache::commit(this);
716 VTune::create_nmethod(this);
717 }
718
719 if (PrintNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
720 ttyLocker ttyl; // keep the following output all in one block
721 // This output goes directly to the tty, not the compiler log.
722 // To enable tools to match it up with the compilation activity,
723 // be sure to tag this tty output with the compile ID.
724 if (xtty != NULL) {
725 xtty->begin_head("print_dtrace_nmethod");
726 xtty->method(_method);
727 xtty->stamp();
728 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
729 }
730 // print the header part first
731 print();
732 // then print the requested information
733 if (PrintNMethods) {
734 print_code();
735 }
736 if (PrintRelocations) {
737 print_relocations();
738 }
739 if (xtty != NULL) {
740 xtty->tail("print_dtrace_nmethod");
741 }
742 }
743 Events::log("Create nmethod " INTPTR_FORMAT, this);
744 }
745 #endif // def HAVE_DTRACE_H
746
747 void* nmethod::operator new(size_t size, int nmethod_size) {
748 // Always leave some room in the CodeCache for I2C/C2I adapters
749 if (CodeCache::unallocated_capacity() < CodeCacheMinimumFreeSpace) return NULL;
750 return CodeCache::allocate(nmethod_size);
751 }
752
753
754 nmethod::nmethod(
755 methodOop method,
756 int nmethod_size,
757 int compile_id,
758 int entry_bci,
759 CodeOffsets* offsets,
760 int orig_pc_offset,
761 DebugInformationRecorder* debug_info,
762 Dependencies* dependencies,
763 CodeBuffer *code_buffer,
764 int frame_size,
765 OopMapSet* oop_maps,
766 ExceptionHandlerTable* handler_table,
767 ImplicitExceptionTable* nul_chk_table,
768 AbstractCompiler* compiler,
769 int comp_level
770 )
771 : CodeBlob("nmethod", code_buffer, sizeof(nmethod),
772 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps),
773 _compiled_synchronized_native_basic_lock_owner_sp_offset(in_ByteSize(-1)),
774 _compiled_synchronized_native_basic_lock_sp_offset(in_ByteSize(-1))
775 {
776 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
777 {
778 debug_only(No_Safepoint_Verifier nsv;)
779 assert_locked_or_safepoint(CodeCache_lock);
780
781 NOT_PRODUCT(_has_debug_info = false);
782 _oops_do_mark_link = NULL;
783 _method = method;
784 _compile_id = compile_id;
785 _comp_level = comp_level;
786 _entry_bci = entry_bci;
787 _osr_link = NULL;
788 _scavenge_root_link = NULL;
789 _scavenge_root_state = 0;
790 _compiler = compiler;
791 _orig_pc_offset = orig_pc_offset;
792 #ifdef HAVE_DTRACE_H
793 _trap_offset = 0;
794 #endif // def HAVE_DTRACE_H
795 _stub_offset = instructions_offset() + code_buffer->total_offset_of(code_buffer->stubs()->start());
796
797 // Exception handler and deopt handler are in the stub section
798 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
799 _deoptimize_offset = _stub_offset + offsets->value(CodeOffsets::Deopt);
800 _deoptimize_mh_offset = _stub_offset + offsets->value(CodeOffsets::DeoptMH);
801 _consts_offset = instructions_offset() + code_buffer->total_offset_of(code_buffer->consts()->start());
802 _scopes_data_offset = data_offset();
803 _scopes_pcs_offset = _scopes_data_offset + round_to(debug_info->data_size (), oopSize);
804 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
805 _handler_table_offset = _dependencies_offset + round_to(dependencies->size_in_bytes (), oopSize);
806 _nul_chk_table_offset = _handler_table_offset + round_to(handler_table->size_in_bytes(), oopSize);
807 _nmethod_end_offset = _nul_chk_table_offset + round_to(nul_chk_table->size_in_bytes(), oopSize);
808
809 _entry_point = instructions_begin();
810 _verified_entry_point = instructions_begin() + offsets->value(CodeOffsets::Verified_Entry);
811 _osr_entry_point = instructions_begin() + offsets->value(CodeOffsets::OSR_Entry);
812 _exception_cache = NULL;
813 _pc_desc_cache.reset_to(scopes_pcs_begin());
814
815 flags.clear();
816 flags.state = alive;
817 _markedForDeoptimization = 0;
818
819 _unload_reported = false; // jvmti state
820
821 _lock_count = 0;
822 _stack_traversal_mark = 0;
823
824 // Copy contents of ScopeDescRecorder to nmethod
825 code_buffer->copy_oops_to(this);
826 debug_info->copy_to(this);
827 dependencies->copy_to(this);
828 if (ScavengeRootsInCode && detect_scavenge_root_oops()) {
829 CodeCache::add_scavenge_root_nmethod(this);
830 }
831 debug_only(verify_scavenge_root_oops());
832
833 CodeCache::commit(this);
834
835 VTune::create_nmethod(this);
836
837 // Copy contents of ExceptionHandlerTable to nmethod
838 handler_table->copy_to(this);
839 nul_chk_table->copy_to(this);
840
841 // we use the information of entry points to find out if a method is
842 // static or non static
843 assert(compiler->is_c2() ||
844 _method->is_static() == (entry_point() == _verified_entry_point),
845 " entry points must be same for static methods and vice versa");
846 }
847
848 bool printnmethods = PrintNMethods
849 || CompilerOracle::should_print(_method)
850 || CompilerOracle::has_option_string(_method, "PrintNMethods");
851 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
852 print_nmethod(printnmethods);
853 }
854
855 // Note: Do not verify in here as the CodeCache_lock is
856 // taken which would conflict with the CompiledIC_lock
857 // which taken during the verification of call sites.
858 // (was bug - gri 10/25/99)
859
860 Events::log("Create nmethod " INTPTR_FORMAT, this);
861 }
862
863
864 // Print a short set of xml attributes to identify this nmethod. The
865 // output should be embedded in some other element.
866 void nmethod::log_identity(xmlStream* log) const {
867 log->print(" compile_id='%d'", compile_id());
868 const char* nm_kind = compile_kind();
869 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind);
870 if (compiler() != NULL) {
871 log->print(" compiler='%s'", compiler()->name());
872 }
873 #ifdef TIERED
874 log->print(" level='%d'", comp_level());
875 #endif // TIERED
876 }
877
878
879 #define LOG_OFFSET(log, name) \
880 if ((intptr_t)name##_end() - (intptr_t)name##_begin()) \
881 log->print(" " XSTR(name) "_offset='%d'" , \
882 (intptr_t)name##_begin() - (intptr_t)this)
883
884
885 void nmethod::log_new_nmethod() const {
886 if (LogCompilation && xtty != NULL) {
887 ttyLocker ttyl;
888 HandleMark hm;
889 xtty->begin_elem("nmethod");
890 log_identity(xtty);
891 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'",
892 instructions_begin(), size());
893 xtty->print(" address='" INTPTR_FORMAT "'", (intptr_t) this);
894
895 LOG_OFFSET(xtty, relocation);
896 LOG_OFFSET(xtty, code);
897 LOG_OFFSET(xtty, stub);
898 LOG_OFFSET(xtty, consts);
899 LOG_OFFSET(xtty, scopes_data);
900 LOG_OFFSET(xtty, scopes_pcs);
901 LOG_OFFSET(xtty, dependencies);
902 LOG_OFFSET(xtty, handler_table);
903 LOG_OFFSET(xtty, nul_chk_table);
904 LOG_OFFSET(xtty, oops);
905
906 xtty->method(method());
907 xtty->stamp();
908 xtty->end_elem();
909 }
910 }
911
912 #undef LOG_OFFSET
913
914
915 // Print out more verbose output usually for a newly created nmethod.
916 void nmethod::print_on(outputStream* st, const char* title) const {
917 if (st != NULL) {
918 ttyLocker ttyl;
919 // Print a little tag line that looks like +PrintCompilation output:
920 int tlen = (int) strlen(title);
921 bool do_nl = false;
922 if (tlen > 0 && title[tlen-1] == '\n') { tlen--; do_nl = true; }
923 st->print("%3d%c %.*s",
924 compile_id(),
925 is_osr_method() ? '%' :
926 method() != NULL &&
927 is_native_method() ? 'n' : ' ',
928 tlen, title);
929 #ifdef TIERED
930 st->print(" (%d) ", comp_level());
931 #endif // TIERED
932 if (WizardMode) st->print(" (" INTPTR_FORMAT ")", this);
933 if (Universe::heap()->is_gc_active() && method() != NULL) {
934 st->print("(method)");
935 } else if (method() != NULL) {
936 method()->print_short_name(st);
937 if (is_osr_method())
938 st->print(" @ %d", osr_entry_bci());
939 if (method()->code_size() > 0)
940 st->print(" (%d bytes)", method()->code_size());
941 }
942
943 if (do_nl) st->cr();
944 }
945 }
946
947
948 void nmethod::print_nmethod(bool printmethod) {
949 ttyLocker ttyl; // keep the following output all in one block
950 if (xtty != NULL) {
951 xtty->begin_head("print_nmethod");
952 xtty->stamp();
953 xtty->end_head();
954 }
955 // print the header part first
956 print();
957 // then print the requested information
958 if (printmethod) {
959 print_code();
960 print_pcs();
961 oop_maps()->print();
962 }
963 if (PrintDebugInfo) {
964 print_scopes();
965 }
966 if (PrintRelocations) {
967 print_relocations();
968 }
969 if (PrintDependencies) {
970 print_dependencies();
971 }
972 if (PrintExceptionHandlers) {
973 print_handler_table();
974 print_nul_chk_table();
975 }
976 if (xtty != NULL) {
977 xtty->tail("print_nmethod");
978 }
979 }
980
981
982 void nmethod::set_version(int v) {
983 flags.version = v;
984 }
985
986
987 ScopeDesc* nmethod::scope_desc_at(address pc) {
988 PcDesc* pd = pc_desc_at(pc);
989 guarantee(pd != NULL, "scope must be present");
990 return new ScopeDesc(this, pd->scope_decode_offset(),
991 pd->obj_decode_offset(), pd->should_reexecute(),
992 pd->return_oop());
993 }
994
995
996 void nmethod::clear_inline_caches() {
997 assert(SafepointSynchronize::is_at_safepoint(), "cleaning of IC's only allowed at safepoint");
998 if (is_zombie()) {
999 return;
1000 }
1001
1002 RelocIterator iter(this);
1003 while (iter.next()) {
1004 iter.reloc()->clear_inline_cache();
1005 }
1006 }
1007
1008
1009 void nmethod::cleanup_inline_caches() {
1010
1011 assert(SafepointSynchronize::is_at_safepoint() &&
1012 !CompiledIC_lock->is_locked() &&
1013 !Patching_lock->is_locked(), "no threads must be updating the inline caches by them selfs");
1014
1015 // If the method is not entrant or zombie then a JMP is plastered over the
1016 // first few bytes. If an oop in the old code was there, that oop
1017 // should not get GC'd. Skip the first few bytes of oops on
1018 // not-entrant methods.
1019 address low_boundary = verified_entry_point();
1020 if (!is_in_use()) {
1021 low_boundary += NativeJump::instruction_size;
1022 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1023 // This means that the low_boundary is going to be a little too high.
1024 // This shouldn't matter, since oops of non-entrant methods are never used.
1025 // In fact, why are we bothering to look at oops in a non-entrant method??
1026 }
1027
1028 // Find all calls in an nmethod, and clear the ones that points to zombie methods
1029 ResourceMark rm;
1030 RelocIterator iter(this, low_boundary);
1031 while(iter.next()) {
1032 switch(iter.type()) {
1033 case relocInfo::virtual_call_type:
1034 case relocInfo::opt_virtual_call_type: {
1035 CompiledIC *ic = CompiledIC_at(iter.reloc());
1036 // Ok, to lookup references to zombies here
1037 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
1038 if( cb != NULL && cb->is_nmethod() ) {
1039 nmethod* nm = (nmethod*)cb;
1040 // Clean inline caches pointing to both zombie and not_entrant methods
1041 if (!nm->is_in_use() || (nm->method()->code() != nm)) ic->set_to_clean();
1042 }
1043 break;
1044 }
1045 case relocInfo::static_call_type: {
1046 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
1047 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
1048 if( cb != NULL && cb->is_nmethod() ) {
1049 nmethod* nm = (nmethod*)cb;
1050 // Clean inline caches pointing to both zombie and not_entrant methods
1051 if (!nm->is_in_use() || (nm->method()->code() != nm)) csc->set_to_clean();
1052 }
1053 break;
1054 }
1055 }
1056 }
1057 }
1058
1059 // This is a private interface with the sweeper.
1060 void nmethod::mark_as_seen_on_stack() {
1061 assert(is_not_entrant(), "must be a non-entrant method");
1062 set_stack_traversal_mark(NMethodSweeper::traversal_count());
1063 }
1064
1065 // Tell if a non-entrant method can be converted to a zombie (i.e., there is no activations on the stack)
1066 bool nmethod::can_not_entrant_be_converted() {
1067 assert(is_not_entrant(), "must be a non-entrant method");
1068 assert(SafepointSynchronize::is_at_safepoint(), "must be called during a safepoint");
1069
1070 // Since the nmethod sweeper only does partial sweep the sweeper's traversal
1071 // count can be greater than the stack traversal count before it hits the
1072 // nmethod for the second time.
1073 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count();
1074 }
1075
1076 void nmethod::inc_decompile_count() {
1077 // Could be gated by ProfileTraps, but do not bother...
1078 methodOop m = method();
1079 if (m == NULL) return;
1080 methodDataOop mdo = m->method_data();
1081 if (mdo == NULL) return;
1082 // There is a benign race here. See comments in methodDataOop.hpp.
1083 mdo->inc_decompile_count();
1084 }
1085
1086 void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) {
1087
1088 post_compiled_method_unload();
1089
1090 // Since this nmethod is being unloaded, make sure that dependencies
1091 // recorded in instanceKlasses get flushed and pass non-NULL closure to
1092 // indicate that this work is being done during a GC.
1093 assert(Universe::heap()->is_gc_active(), "should only be called during gc");
1094 assert(is_alive != NULL, "Should be non-NULL");
1095 // A non-NULL is_alive closure indicates that this is being called during GC.
1096 flush_dependencies(is_alive);
1097
1098 // Break cycle between nmethod & method
1099 if (TraceClassUnloading && WizardMode) {
1100 tty->print_cr("[Class unloading: Making nmethod " INTPTR_FORMAT
1101 " unloadable], methodOop(" INTPTR_FORMAT
1102 "), cause(" INTPTR_FORMAT ")",
1103 this, (address)_method, (address)cause);
1104 if (!Universe::heap()->is_gc_active())
1105 cause->klass()->print();
1106 }
1107 // Unlink the osr method, so we do not look this up again
1108 if (is_osr_method()) {
1109 invalidate_osr_method();
1110 }
1111 // If _method is already NULL the methodOop is about to be unloaded,
1112 // so we don't have to break the cycle. Note that it is possible to
1113 // have the methodOop live here, in case we unload the nmethod because
1114 // it is pointing to some oop (other than the methodOop) being unloaded.
1115 if (_method != NULL) {
1116 // OSR methods point to the methodOop, but the methodOop does not
1117 // point back!
1118 if (_method->code() == this) {
1119 _method->clear_code(); // Break a cycle
1120 }
1121 _method = NULL; // Clear the method of this dead nmethod
1122 }
1123 // Make the class unloaded - i.e., change state and notify sweeper
1124 check_safepoint();
1125 if (is_in_use()) {
1126 // Transitioning directly from live to unloaded -- so
1127 // we need to force a cache clean-up; remember this
1128 // for later on.
1129 CodeCache::set_needs_cache_clean(true);
1130 }
1131 flags.state = unloaded;
1132
1133 // Log the unloading.
1134 log_state_change();
1135
1136 // The methodOop is gone at this point
1137 assert(_method == NULL, "Tautology");
1138
1139 set_osr_link(NULL);
1140 //set_scavenge_root_link(NULL); // done by prune_scavenge_root_nmethods
1141 NMethodSweeper::notify(this);
1142 }
1143
1144 void nmethod::invalidate_osr_method() {
1145 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
1146 // Remove from list of active nmethods
1147 if (method() != NULL)
1148 instanceKlass::cast(method()->method_holder())->remove_osr_nmethod(this);
1149 // Set entry as invalid
1150 _entry_bci = InvalidOSREntryBci;
1151 }
1152
1153 void nmethod::log_state_change() const {
1154 if (LogCompilation) {
1155 if (xtty != NULL) {
1156 ttyLocker ttyl; // keep the following output all in one block
1157 if (flags.state == unloaded) {
1158 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'",
1159 os::current_thread_id());
1160 } else {
1161 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s",
1162 os::current_thread_id(),
1163 (flags.state == zombie ? " zombie='1'" : ""));
1164 }
1165 log_identity(xtty);
1166 xtty->stamp();
1167 xtty->end_elem();
1168 }
1169 }
1170 if (PrintCompilation && flags.state != unloaded) {
1171 print_on(tty, flags.state == zombie ? "made zombie " : "made not entrant ");
1172 tty->cr();
1173 }
1174 }
1175
1176 // Common functionality for both make_not_entrant and make_zombie
1177 bool nmethod::make_not_entrant_or_zombie(unsigned int state) {
1178 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant");
1179
1180 bool was_alive = false;
1181
1182 // Make sure the nmethod is not flushed in case of a safepoint in code below.
1183 nmethodLocker nml(this);
1184
1185 {
1186 // If the method is already zombie there is nothing to do
1187 if (is_zombie()) {
1188 return false;
1189 }
1190
1191 // invalidate osr nmethod before acquiring the patching lock since
1192 // they both acquire leaf locks and we don't want a deadlock.
1193 // This logic is equivalent to the logic below for patching the
1194 // verified entry point of regular methods.
1195 if (is_osr_method()) {
1196 // this effectively makes the osr nmethod not entrant
1197 invalidate_osr_method();
1198 }
1199
1200 // Enter critical section. Does not block for safepoint.
1201 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1202
1203 if (flags.state == state) {
1204 // another thread already performed this transition so nothing
1205 // to do, but return false to indicate this.
1206 return false;
1207 }
1208
1209 // The caller can be calling the method statically or through an inline
1210 // cache call.
1211 if (!is_osr_method() && !is_not_entrant()) {
1212 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
1213 SharedRuntime::get_handle_wrong_method_stub());
1214 assert (NativeJump::instruction_size == nmethod::_zombie_instruction_size, "");
1215 }
1216
1217 // When the nmethod becomes zombie it is no longer alive so the
1218 // dependencies must be flushed. nmethods in the not_entrant
1219 // state will be flushed later when the transition to zombie
1220 // happens or they get unloaded.
1221 if (state == zombie) {
1222 assert(SafepointSynchronize::is_at_safepoint(), "must be done at safepoint");
1223 flush_dependencies(NULL);
1224 } else {
1225 assert(state == not_entrant, "other cases may need to be handled differently");
1226 }
1227
1228 was_alive = is_in_use(); // Read state under lock
1229
1230 // Change state
1231 flags.state = state;
1232
1233 // Log the transition once
1234 log_state_change();
1235
1236 } // leave critical region under Patching_lock
1237
1238 if (state == not_entrant) {
1239 Events::log("Make nmethod not entrant " INTPTR_FORMAT, this);
1240 } else {
1241 Events::log("Make nmethod zombie " INTPTR_FORMAT, this);
1242 }
1243
1244 if (TraceCreateZombies) {
1245 tty->print_cr("nmethod <" INTPTR_FORMAT "> code made %s", this, (state == not_entrant) ? "not entrant" : "zombie");
1246 }
1247
1248 // Make sweeper aware that there is a zombie method that needs to be removed
1249 NMethodSweeper::notify(this);
1250
1251 // not_entrant only stuff
1252 if (state == not_entrant) {
1253 mark_as_seen_on_stack();
1254 }
1255
1256 if (was_alive) {
1257 // It's a true state change, so mark the method as decompiled.
1258 // Do it only for transition from alive.
1259 inc_decompile_count();
1260 }
1261
1262 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload event
1263 // and it hasn't already been reported for this nmethod then report it now.
1264 // (the event may have been reported earilier if the GC marked it for unloading).
1265 if (state == zombie) {
1266
1267 DTRACE_METHOD_UNLOAD_PROBE(method());
1268
1269 if (JvmtiExport::should_post_compiled_method_unload() &&
1270 !unload_reported()) {
1271 assert(method() != NULL, "checking");
1272 {
1273 HandleMark hm;
1274 JvmtiExport::post_compiled_method_unload_at_safepoint(
1275 method()->jmethod_id(), code_begin());
1276 }
1277 set_unload_reported();
1278 }
1279 }
1280
1281
1282 // Zombie only stuff
1283 if (state == zombie) {
1284 VTune::delete_nmethod(this);
1285 }
1286
1287 // Check whether method got unloaded at a safepoint before this,
1288 // if so we can skip the flushing steps below
1289 if (method() == NULL) return true;
1290
1291 // Remove nmethod from method.
1292 // We need to check if both the _code and _from_compiled_code_entry_point
1293 // refer to this nmethod because there is a race in setting these two fields
1294 // in methodOop as seen in bugid 4947125.
1295 // If the vep() points to the zombie nmethod, the memory for the nmethod
1296 // could be flushed and the compiler and vtable stubs could still call
1297 // through it.
1298 if (method()->code() == this ||
1299 method()->from_compiled_entry() == verified_entry_point()) {
1300 HandleMark hm;
1301 method()->clear_code();
1302 }
1303
1304 return true;
1305 }
1306
1307
1308 #ifndef PRODUCT
1309 void nmethod::check_safepoint() {
1310 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
1311 }
1312 #endif
1313
1314
1315 void nmethod::flush() {
1316 // Note that there are no valid oops in the nmethod anymore.
1317 assert(is_zombie() || (is_osr_method() && is_unloaded()), "must be a zombie method");
1318 assert(is_marked_for_reclamation() || (is_osr_method() && is_unloaded()), "must be marked for reclamation");
1319
1320 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed");
1321 check_safepoint();
1322
1323 // completely deallocate this method
1324 EventMark m("flushing nmethod " INTPTR_FORMAT " %s", this, "");
1325 if (PrintMethodFlushing) {
1326 tty->print_cr("*flushing nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT "/Free CodeCache:" SIZE_FORMAT "Kb",
1327 _compile_id, this, CodeCache::nof_blobs(), CodeCache::unallocated_capacity()/1024);
1328 }
1329
1330 // We need to deallocate any ExceptionCache data.
1331 // Note that we do not need to grab the nmethod lock for this, it
1332 // better be thread safe if we're disposing of it!
1333 ExceptionCache* ec = exception_cache();
1334 set_exception_cache(NULL);
1335 while(ec != NULL) {
1336 ExceptionCache* next = ec->next();
1337 delete ec;
1338 ec = next;
1339 }
1340
1341 if (on_scavenge_root_list()) {
1342 CodeCache::drop_scavenge_root_nmethod(this);
1343 }
1344
1345 if (is_speculatively_disconnected()) {
1346 CodeCache::remove_saved_code(this);
1347 }
1348
1349 ((CodeBlob*)(this))->flush();
1350
1351 CodeCache::free(this);
1352 }
1353
1354
1355 //
1356 // Notify all classes this nmethod is dependent on that it is no
1357 // longer dependent. This should only be called in two situations.
1358 // First, when a nmethod transitions to a zombie all dependents need
1359 // to be clear. Since zombification happens at a safepoint there's no
1360 // synchronization issues. The second place is a little more tricky.
1361 // During phase 1 of mark sweep class unloading may happen and as a
1362 // result some nmethods may get unloaded. In this case the flushing
1363 // of dependencies must happen during phase 1 since after GC any
1364 // dependencies in the unloaded nmethod won't be updated, so
1365 // traversing the dependency information in unsafe. In that case this
1366 // function is called with a non-NULL argument and this function only
1367 // notifies instanceKlasses that are reachable
1368
1369 void nmethod::flush_dependencies(BoolObjectClosure* is_alive) {
1370 assert(SafepointSynchronize::is_at_safepoint(), "must be done at safepoint");
1371 assert(Universe::heap()->is_gc_active() == (is_alive != NULL),
1372 "is_alive is non-NULL if and only if we are called during GC");
1373 if (!has_flushed_dependencies()) {
1374 set_has_flushed_dependencies();
1375 for (Dependencies::DepStream deps(this); deps.next(); ) {
1376 klassOop klass = deps.context_type();
1377 if (klass == NULL) continue; // ignore things like evol_method
1378
1379 // During GC the is_alive closure is non-NULL, and is used to
1380 // determine liveness of dependees that need to be updated.
1381 if (is_alive == NULL || is_alive->do_object_b(klass)) {
1382 instanceKlass::cast(klass)->remove_dependent_nmethod(this);
1383 }
1384 }
1385 }
1386 }
1387
1388
1389 // If this oop is not live, the nmethod can be unloaded.
1390 bool nmethod::can_unload(BoolObjectClosure* is_alive,
1391 OopClosure* keep_alive,
1392 oop* root, bool unloading_occurred) {
1393 assert(root != NULL, "just checking");
1394 oop obj = *root;
1395 if (obj == NULL || is_alive->do_object_b(obj)) {
1396 return false;
1397 }
1398 if (obj->is_compiledICHolder()) {
1399 compiledICHolderOop cichk_oop = compiledICHolderOop(obj);
1400 if (is_alive->do_object_b(
1401 cichk_oop->holder_method()->method_holder()) &&
1402 is_alive->do_object_b(cichk_oop->holder_klass())) {
1403 // The oop should be kept alive
1404 keep_alive->do_oop(root);
1405 return false;
1406 }
1407 }
1408 // If ScavengeRootsInCode is true, an nmethod might be unloaded
1409 // simply because one of its constant oops has gone dead.
1410 // No actual classes need to be unloaded in order for this to occur.
1411 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading");
1412 make_unloaded(is_alive, obj);
1413 return true;
1414 }
1415
1416 // ------------------------------------------------------------------
1417 // post_compiled_method_load_event
1418 // new method for install_code() path
1419 // Transfer information from compilation to jvmti
1420 void nmethod::post_compiled_method_load_event() {
1421
1422 methodOop moop = method();
1423 HS_DTRACE_PROBE8(hotspot, compiled__method__load,
1424 moop->klass_name()->bytes(),
1425 moop->klass_name()->utf8_length(),
1426 moop->name()->bytes(),
1427 moop->name()->utf8_length(),
1428 moop->signature()->bytes(),
1429 moop->signature()->utf8_length(),
1430 code_begin(), code_size());
1431
1432 if (JvmtiExport::should_post_compiled_method_load()) {
1433 JvmtiExport::post_compiled_method_load(this);
1434 }
1435 }
1436
1437 void nmethod::post_compiled_method_unload() {
1438 assert(_method != NULL && !is_unloaded(), "just checking");
1439 DTRACE_METHOD_UNLOAD_PROBE(method());
1440
1441 // If a JVMTI agent has enabled the CompiledMethodUnload event then
1442 // post the event. Sometime later this nmethod will be made a zombie by
1443 // the sweeper but the methodOop will not be valid at that point.
1444 if (JvmtiExport::should_post_compiled_method_unload()) {
1445 assert(!unload_reported(), "already unloaded");
1446 HandleMark hm;
1447 JvmtiExport::post_compiled_method_unload_at_safepoint(
1448 method()->jmethod_id(), code_begin());
1449 }
1450
1451 // The JVMTI CompiledMethodUnload event can be enabled or disabled at
1452 // any time. As the nmethod is being unloaded now we mark it has
1453 // having the unload event reported - this will ensure that we don't
1454 // attempt to report the event in the unlikely scenario where the
1455 // event is enabled at the time the nmethod is made a zombie.
1456 set_unload_reported();
1457 }
1458
1459 // This is called at the end of the strong tracing/marking phase of a
1460 // GC to unload an nmethod if it contains otherwise unreachable
1461 // oops.
1462
1463 void nmethod::do_unloading(BoolObjectClosure* is_alive,
1464 OopClosure* keep_alive, bool unloading_occurred) {
1465 // Make sure the oop's ready to receive visitors
1466 assert(!is_zombie() && !is_unloaded(),
1467 "should not call follow on zombie or unloaded nmethod");
1468
1469 // If the method is not entrant then a JMP is plastered over the
1470 // first few bytes. If an oop in the old code was there, that oop
1471 // should not get GC'd. Skip the first few bytes of oops on
1472 // not-entrant methods.
1473 address low_boundary = verified_entry_point();
1474 if (is_not_entrant()) {
1475 low_boundary += NativeJump::instruction_size;
1476 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1477 // (See comment above.)
1478 }
1479
1480 // The RedefineClasses() API can cause the class unloading invariant
1481 // to no longer be true. See jvmtiExport.hpp for details.
1482 // Also, leave a debugging breadcrumb in local flag.
1483 bool a_class_was_redefined = JvmtiExport::has_redefined_a_class();
1484 if (a_class_was_redefined) {
1485 // This set of the unloading_occurred flag is done before the
1486 // call to post_compiled_method_unload() so that the unloading
1487 // of this nmethod is reported.
1488 unloading_occurred = true;
1489 }
1490
1491 // Follow methodOop
1492 if (can_unload(is_alive, keep_alive, (oop*)&_method, unloading_occurred)) {
1493 return;
1494 }
1495
1496 // Exception cache
1497 ExceptionCache* ec = exception_cache();
1498 while (ec != NULL) {
1499 oop* ex_addr = (oop*)ec->exception_type_addr();
1500 oop ex = *ex_addr;
1501 ExceptionCache* next_ec = ec->next();
1502 if (ex != NULL && !is_alive->do_object_b(ex)) {
1503 assert(!ex->is_compiledICHolder(), "Possible error here");
1504 remove_from_exception_cache(ec);
1505 }
1506 ec = next_ec;
1507 }
1508
1509 // If class unloading occurred we first iterate over all inline caches and
1510 // clear ICs where the cached oop is referring to an unloaded klass or method.
1511 // The remaining live cached oops will be traversed in the relocInfo::oop_type
1512 // iteration below.
1513 if (unloading_occurred) {
1514 RelocIterator iter(this, low_boundary);
1515 while(iter.next()) {
1516 if (iter.type() == relocInfo::virtual_call_type) {
1517 CompiledIC *ic = CompiledIC_at(iter.reloc());
1518 oop ic_oop = ic->cached_oop();
1519 if (ic_oop != NULL && !is_alive->do_object_b(ic_oop)) {
1520 // The only exception is compiledICHolder oops which may
1521 // yet be marked below. (We check this further below).
1522 if (ic_oop->is_compiledICHolder()) {
1523 compiledICHolderOop cichk_oop = compiledICHolderOop(ic_oop);
1524 if (is_alive->do_object_b(
1525 cichk_oop->holder_method()->method_holder()) &&
1526 is_alive->do_object_b(cichk_oop->holder_klass())) {
1527 continue;
1528 }
1529 }
1530 ic->set_to_clean();
1531 assert(ic->cached_oop() == NULL, "cached oop in IC should be cleared")
1532 }
1533 }
1534 }
1535 }
1536
1537 // Compiled code
1538 RelocIterator iter(this, low_boundary);
1539 while (iter.next()) {
1540 if (iter.type() == relocInfo::oop_type) {
1541 oop_Relocation* r = iter.oop_reloc();
1542 // In this loop, we must only traverse those oops directly embedded in
1543 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1544 assert(1 == (r->oop_is_immediate()) +
1545 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1546 "oop must be found in exactly one place");
1547 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1548 if (can_unload(is_alive, keep_alive, r->oop_addr(), unloading_occurred)) {
1549 return;
1550 }
1551 }
1552 }
1553 }
1554
1555
1556 // Scopes
1557 for (oop* p = oops_begin(); p < oops_end(); p++) {
1558 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1559 if (can_unload(is_alive, keep_alive, p, unloading_occurred)) {
1560 return;
1561 }
1562 }
1563
1564 #ifndef PRODUCT
1565 // This nmethod was not unloaded; check below that all CompiledICs
1566 // refer to marked oops.
1567 {
1568 RelocIterator iter(this, low_boundary);
1569 while (iter.next()) {
1570 if (iter.type() == relocInfo::virtual_call_type) {
1571 CompiledIC *ic = CompiledIC_at(iter.reloc());
1572 oop ic_oop = ic->cached_oop();
1573 assert(ic_oop == NULL || is_alive->do_object_b(ic_oop),
1574 "Found unmarked ic_oop in reachable nmethod");
1575 }
1576 }
1577 }
1578 #endif // !PRODUCT
1579 }
1580
1581 // This method is called twice during GC -- once while
1582 // tracing the "active" nmethods on thread stacks during
1583 // the (strong) marking phase, and then again when walking
1584 // the code cache contents during the weak roots processing
1585 // phase. The two uses are distinguished by means of the
1586 // 'do_strong_roots_only' flag, which is true in the first
1587 // case. We want to walk the weak roots in the nmethod
1588 // only in the second case. The weak roots in the nmethod
1589 // are the oops in the ExceptionCache and the InlineCache
1590 // oops.
1591 void nmethod::oops_do(OopClosure* f, bool do_strong_roots_only) {
1592 // make sure the oops ready to receive visitors
1593 assert(!is_zombie() && !is_unloaded(),
1594 "should not call follow on zombie or unloaded nmethod");
1595
1596 // If the method is not entrant or zombie then a JMP is plastered over the
1597 // first few bytes. If an oop in the old code was there, that oop
1598 // should not get GC'd. Skip the first few bytes of oops on
1599 // not-entrant methods.
1600 address low_boundary = verified_entry_point();
1601 if (is_not_entrant()) {
1602 low_boundary += NativeJump::instruction_size;
1603 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1604 // (See comment above.)
1605 }
1606
1607 // Compiled code
1608 f->do_oop((oop*) &_method);
1609 if (!do_strong_roots_only) {
1610 // weak roots processing phase -- update ExceptionCache oops
1611 ExceptionCache* ec = exception_cache();
1612 while(ec != NULL) {
1613 f->do_oop((oop*)ec->exception_type_addr());
1614 ec = ec->next();
1615 }
1616 } // Else strong roots phase -- skip oops in ExceptionCache
1617
1618 RelocIterator iter(this, low_boundary);
1619
1620 while (iter.next()) {
1621 if (iter.type() == relocInfo::oop_type ) {
1622 oop_Relocation* r = iter.oop_reloc();
1623 // In this loop, we must only follow those oops directly embedded in
1624 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1625 assert(1 == (r->oop_is_immediate()) +
1626 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1627 "oop must be found in exactly one place");
1628 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1629 f->do_oop(r->oop_addr());
1630 }
1631 }
1632 }
1633
1634 // Scopes
1635 // This includes oop constants not inlined in the code stream.
1636 for (oop* p = oops_begin(); p < oops_end(); p++) {
1637 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1638 f->do_oop(p);
1639 }
1640 }
1641
1642 #define NMETHOD_SENTINEL ((nmethod*)badAddress)
1643
1644 nmethod* volatile nmethod::_oops_do_mark_nmethods;
1645
1646 // An nmethod is "marked" if its _mark_link is set non-null.
1647 // Even if it is the end of the linked list, it will have a non-null link value,
1648 // as long as it is on the list.
1649 // This code must be MP safe, because it is used from parallel GC passes.
1650 bool nmethod::test_set_oops_do_mark() {
1651 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");
1652 nmethod* observed_mark_link = _oops_do_mark_link;
1653 if (observed_mark_link == NULL) {
1654 // Claim this nmethod for this thread to mark.
1655 observed_mark_link = (nmethod*)
1656 Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_link, NULL);
1657 if (observed_mark_link == NULL) {
1658
1659 // Atomically append this nmethod (now claimed) to the head of the list:
1660 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods;
1661 for (;;) {
1662 nmethod* required_mark_nmethods = observed_mark_nmethods;
1663 _oops_do_mark_link = required_mark_nmethods;
1664 observed_mark_nmethods = (nmethod*)
1665 Atomic::cmpxchg_ptr(this, &_oops_do_mark_nmethods, required_mark_nmethods);
1666 if (observed_mark_nmethods == required_mark_nmethods)
1667 break;
1668 }
1669 // Mark was clear when we first saw this guy.
1670 NOT_PRODUCT(if (TraceScavenge) print_on(tty, "oops_do, mark\n"));
1671 return false;
1672 }
1673 }
1674 // On fall through, another racing thread marked this nmethod before we did.
1675 return true;
1676 }
1677
1678 void nmethod::oops_do_marking_prologue() {
1679 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("[oops_do_marking_prologue"));
1680 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row");
1681 // We use cmpxchg_ptr instead of regular assignment here because the user
1682 // may fork a bunch of threads, and we need them all to see the same state.
1683 void* observed = Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, NULL);
1684 guarantee(observed == NULL, "no races in this sequential code");
1685 }
1686
1687 void nmethod::oops_do_marking_epilogue() {
1688 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row");
1689 nmethod* cur = _oops_do_mark_nmethods;
1690 while (cur != NMETHOD_SENTINEL) {
1691 assert(cur != NULL, "not NULL-terminated");
1692 nmethod* next = cur->_oops_do_mark_link;
1693 cur->_oops_do_mark_link = NULL;
1694 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark\n"));
1695 cur = next;
1696 }
1697 void* required = _oops_do_mark_nmethods;
1698 void* observed = Atomic::cmpxchg_ptr(NULL, &_oops_do_mark_nmethods, required);
1699 guarantee(observed == required, "no races in this sequential code");
1700 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("oops_do_marking_epilogue]"));
1701 }
1702
1703 class DetectScavengeRoot: public OopClosure {
1704 bool _detected_scavenge_root;
1705 public:
1706 DetectScavengeRoot() : _detected_scavenge_root(false)
1707 { NOT_PRODUCT(_print_nm = NULL); }
1708 bool detected_scavenge_root() { return _detected_scavenge_root; }
1709 virtual void do_oop(oop* p) {
1710 if ((*p) != NULL && (*p)->is_scavengable()) {
1711 NOT_PRODUCT(maybe_print(p));
1712 _detected_scavenge_root = true;
1713 }
1714 }
1715 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
1716
1717 #ifndef PRODUCT
1718 nmethod* _print_nm;
1719 void maybe_print(oop* p) {
1720 if (_print_nm == NULL) return;
1721 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root");
1722 tty->print_cr(""PTR_FORMAT"[offset=%d] detected non-perm oop "PTR_FORMAT" (found at "PTR_FORMAT")",
1723 _print_nm, (int)((intptr_t)p - (intptr_t)_print_nm),
1724 (intptr_t)(*p), (intptr_t)p);
1725 (*p)->print();
1726 }
1727 #endif //PRODUCT
1728 };
1729
1730 bool nmethod::detect_scavenge_root_oops() {
1731 DetectScavengeRoot detect_scavenge_root;
1732 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this);
1733 oops_do(&detect_scavenge_root);
1734 return detect_scavenge_root.detected_scavenge_root();
1735 }
1736
1737 // Method that knows how to preserve outgoing arguments at call. This method must be
1738 // called with a frame corresponding to a Java invoke
1739 void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) {
1740 if (!method()->is_native()) {
1741 SimpleScopeDesc ssd(this, fr.pc());
1742 Bytecode_invoke* call = Bytecode_invoke_at(ssd.method(), ssd.bci());
1743 bool has_receiver = call->has_receiver();
1744 symbolOop signature = call->signature();
1745 fr.oops_compiled_arguments_do(signature, has_receiver, reg_map, f);
1746 }
1747 }
1748
1749
1750 oop nmethod::embeddedOop_at(u_char* p) {
1751 RelocIterator iter(this, p, p + oopSize);
1752 while (iter.next())
1753 if (iter.type() == relocInfo::oop_type) {
1754 return iter.oop_reloc()->oop_value();
1755 }
1756 return NULL;
1757 }
1758
1759
1760 inline bool includes(void* p, void* from, void* to) {
1761 return from <= p && p < to;
1762 }
1763
1764
1765 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
1766 assert(count >= 2, "must be sentinel values, at least");
1767
1768 #ifdef ASSERT
1769 // must be sorted and unique; we do a binary search in find_pc_desc()
1770 int prev_offset = pcs[0].pc_offset();
1771 assert(prev_offset == PcDesc::lower_offset_limit,
1772 "must start with a sentinel");
1773 for (int i = 1; i < count; i++) {
1774 int this_offset = pcs[i].pc_offset();
1775 assert(this_offset > prev_offset, "offsets must be sorted");
1776 prev_offset = this_offset;
1777 }
1778 assert(prev_offset == PcDesc::upper_offset_limit,
1779 "must end with a sentinel");
1780 #endif //ASSERT
1781
1782 // Search for MethodHandle invokes and tag the nmethod.
1783 for (int i = 0; i < count; i++) {
1784 if (pcs[i].is_method_handle_invoke()) {
1785 set_has_method_handle_invokes(true);
1786 break;
1787 }
1788 }
1789
1790 int size = count * sizeof(PcDesc);
1791 assert(scopes_pcs_size() >= size, "oob");
1792 memcpy(scopes_pcs_begin(), pcs, size);
1793
1794 // Adjust the final sentinel downward.
1795 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
1796 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
1797 last_pc->set_pc_offset(instructions_size() + 1);
1798 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
1799 // Fill any rounding gaps with copies of the last record.
1800 last_pc[1] = last_pc[0];
1801 }
1802 // The following assert could fail if sizeof(PcDesc) is not
1803 // an integral multiple of oopSize (the rounding term).
1804 // If it fails, change the logic to always allocate a multiple
1805 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
1806 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
1807 }
1808
1809 void nmethod::copy_scopes_data(u_char* buffer, int size) {
1810 assert(scopes_data_size() >= size, "oob");
1811 memcpy(scopes_data_begin(), buffer, size);
1812 }
1813
1814
1815 #ifdef ASSERT
1816 static PcDesc* linear_search(nmethod* nm, int pc_offset, bool approximate) {
1817 PcDesc* lower = nm->scopes_pcs_begin();
1818 PcDesc* upper = nm->scopes_pcs_end();
1819 lower += 1; // exclude initial sentinel
1820 PcDesc* res = NULL;
1821 for (PcDesc* p = lower; p < upper; p++) {
1822 NOT_PRODUCT(--nmethod_stats.pc_desc_tests); // don't count this call to match_desc
1823 if (match_desc(p, pc_offset, approximate)) {
1824 if (res == NULL)
1825 res = p;
1826 else
1827 res = (PcDesc*) badAddress;
1828 }
1829 }
1830 return res;
1831 }
1832 #endif
1833
1834
1835 // Finds a PcDesc with real-pc equal to "pc"
1836 PcDesc* nmethod::find_pc_desc_internal(address pc, bool approximate) {
1837 address base_address = instructions_begin();
1838 if ((pc < base_address) ||
1839 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
1840 return NULL; // PC is wildly out of range
1841 }
1842 int pc_offset = (int) (pc - base_address);
1843
1844 // Check the PcDesc cache if it contains the desired PcDesc
1845 // (This as an almost 100% hit rate.)
1846 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
1847 if (res != NULL) {
1848 assert(res == linear_search(this, pc_offset, approximate), "cache ok");
1849 return res;
1850 }
1851
1852 // Fallback algorithm: quasi-linear search for the PcDesc
1853 // Find the last pc_offset less than the given offset.
1854 // The successor must be the required match, if there is a match at all.
1855 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
1856 PcDesc* lower = scopes_pcs_begin();
1857 PcDesc* upper = scopes_pcs_end();
1858 upper -= 1; // exclude final sentinel
1859 if (lower >= upper) return NULL; // native method; no PcDescs at all
1860
1861 #define assert_LU_OK \
1862 /* invariant on lower..upper during the following search: */ \
1863 assert(lower->pc_offset() < pc_offset, "sanity"); \
1864 assert(upper->pc_offset() >= pc_offset, "sanity")
1865 assert_LU_OK;
1866
1867 // Use the last successful return as a split point.
1868 PcDesc* mid = _pc_desc_cache.last_pc_desc();
1869 NOT_PRODUCT(++nmethod_stats.pc_desc_searches);
1870 if (mid->pc_offset() < pc_offset) {
1871 lower = mid;
1872 } else {
1873 upper = mid;
1874 }
1875
1876 // Take giant steps at first (4096, then 256, then 16, then 1)
1877 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
1878 const int RADIX = (1 << LOG2_RADIX);
1879 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
1880 while ((mid = lower + step) < upper) {
1881 assert_LU_OK;
1882 NOT_PRODUCT(++nmethod_stats.pc_desc_searches);
1883 if (mid->pc_offset() < pc_offset) {
1884 lower = mid;
1885 } else {
1886 upper = mid;
1887 break;
1888 }
1889 }
1890 assert_LU_OK;
1891 }
1892
1893 // Sneak up on the value with a linear search of length ~16.
1894 while (true) {
1895 assert_LU_OK;
1896 mid = lower + 1;
1897 NOT_PRODUCT(++nmethod_stats.pc_desc_searches);
1898 if (mid->pc_offset() < pc_offset) {
1899 lower = mid;
1900 } else {
1901 upper = mid;
1902 break;
1903 }
1904 }
1905 #undef assert_LU_OK
1906
1907 if (match_desc(upper, pc_offset, approximate)) {
1908 assert(upper == linear_search(this, pc_offset, approximate), "search ok");
1909 _pc_desc_cache.add_pc_desc(upper);
1910 return upper;
1911 } else {
1912 assert(NULL == linear_search(this, pc_offset, approximate), "search ok");
1913 return NULL;
1914 }
1915 }
1916
1917
1918 bool nmethod::check_all_dependencies() {
1919 bool found_check = false;
1920 // wholesale check of all dependencies
1921 for (Dependencies::DepStream deps(this); deps.next(); ) {
1922 if (deps.check_dependency() != NULL) {
1923 found_check = true;
1924 NOT_DEBUG(break);
1925 }
1926 }
1927 return found_check; // tell caller if we found anything
1928 }
1929
1930 bool nmethod::check_dependency_on(DepChange& changes) {
1931 // What has happened:
1932 // 1) a new class dependee has been added
1933 // 2) dependee and all its super classes have been marked
1934 bool found_check = false; // set true if we are upset
1935 for (Dependencies::DepStream deps(this); deps.next(); ) {
1936 // Evaluate only relevant dependencies.
1937 if (deps.spot_check_dependency_at(changes) != NULL) {
1938 found_check = true;
1939 NOT_DEBUG(break);
1940 }
1941 }
1942 return found_check;
1943 }
1944
1945 bool nmethod::is_evol_dependent_on(klassOop dependee) {
1946 instanceKlass *dependee_ik = instanceKlass::cast(dependee);
1947 objArrayOop dependee_methods = dependee_ik->methods();
1948 for (Dependencies::DepStream deps(this); deps.next(); ) {
1949 if (deps.type() == Dependencies::evol_method) {
1950 methodOop method = deps.method_argument(0);
1951 for (int j = 0; j < dependee_methods->length(); j++) {
1952 if ((methodOop) dependee_methods->obj_at(j) == method) {
1953 // RC_TRACE macro has an embedded ResourceMark
1954 RC_TRACE(0x01000000,
1955 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)",
1956 _method->method_holder()->klass_part()->external_name(),
1957 _method->name()->as_C_string(),
1958 _method->signature()->as_C_string(), compile_id(),
1959 method->method_holder()->klass_part()->external_name(),
1960 method->name()->as_C_string(),
1961 method->signature()->as_C_string()));
1962 if (TraceDependencies || LogCompilation)
1963 deps.log_dependency(dependee);
1964 return true;
1965 }
1966 }
1967 }
1968 }
1969 return false;
1970 }
1971
1972 // Called from mark_for_deoptimization, when dependee is invalidated.
1973 bool nmethod::is_dependent_on_method(methodOop dependee) {
1974 for (Dependencies::DepStream deps(this); deps.next(); ) {
1975 if (deps.type() != Dependencies::evol_method)
1976 continue;
1977 methodOop method = deps.method_argument(0);
1978 if (method == dependee) return true;
1979 }
1980 return false;
1981 }
1982
1983
1984 bool nmethod::is_patchable_at(address instr_addr) {
1985 assert (code_contains(instr_addr), "wrong nmethod used");
1986 if (is_zombie()) {
1987 // a zombie may never be patched
1988 return false;
1989 }
1990 return true;
1991 }
1992
1993
1994 address nmethod::continuation_for_implicit_exception(address pc) {
1995 // Exception happened outside inline-cache check code => we are inside
1996 // an active nmethod => use cpc to determine a return address
1997 int exception_offset = pc - instructions_begin();
1998 int cont_offset = ImplicitExceptionTable(this).at( exception_offset );
1999 #ifdef ASSERT
2000 if (cont_offset == 0) {
2001 Thread* thread = ThreadLocalStorage::get_thread_slow();
2002 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
2003 HandleMark hm(thread);
2004 ResourceMark rm(thread);
2005 CodeBlob* cb = CodeCache::find_blob(pc);
2006 assert(cb != NULL && cb == this, "");
2007 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, pc);
2008 print();
2009 method()->print_codes();
2010 print_code();
2011 print_pcs();
2012 }
2013 #endif
2014 if (cont_offset == 0) {
2015 // Let the normal error handling report the exception
2016 return NULL;
2017 }
2018 return instructions_begin() + cont_offset;
2019 }
2020
2021
2022
2023 void nmethod_init() {
2024 // make sure you didn't forget to adjust the filler fields
2025 assert(sizeof(nmFlags) <= 4, "nmFlags occupies more than a word");
2026 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
2027 }
2028
2029
2030 //-------------------------------------------------------------------------------------------
2031
2032
2033 // QQQ might we make this work from a frame??
2034 nmethodLocker::nmethodLocker(address pc) {
2035 CodeBlob* cb = CodeCache::find_blob(pc);
2036 guarantee(cb != NULL && cb->is_nmethod(), "bad pc for a nmethod found");
2037 _nm = (nmethod*)cb;
2038 lock_nmethod(_nm);
2039 }
2040
2041 void nmethodLocker::lock_nmethod(nmethod* nm) {
2042 if (nm == NULL) return;
2043 Atomic::inc(&nm->_lock_count);
2044 guarantee(!nm->is_zombie(), "cannot lock a zombie method");
2045 }
2046
2047 void nmethodLocker::unlock_nmethod(nmethod* nm) {
2048 if (nm == NULL) return;
2049 Atomic::dec(&nm->_lock_count);
2050 guarantee(nm->_lock_count >= 0, "unmatched nmethod lock/unlock");
2051 }
2052
2053
2054 // -----------------------------------------------------------------------------
2055 // nmethod::get_deopt_original_pc
2056 //
2057 // Return the original PC for the given PC if:
2058 // (a) the given PC belongs to a nmethod and
2059 // (b) it is a deopt PC
2060 address nmethod::get_deopt_original_pc(const frame* fr) {
2061 if (fr->cb() == NULL) return NULL;
2062
2063 nmethod* nm = fr->cb()->as_nmethod_or_null();
2064 if (nm != NULL && nm->is_deopt_pc(fr->pc()))
2065 return nm->get_original_pc(fr);
2066
2067 return NULL;
2068 }
2069
2070
2071 // -----------------------------------------------------------------------------
2072 // MethodHandle
2073
2074 bool nmethod::is_method_handle_return(address return_pc) {
2075 if (!has_method_handle_invokes()) return false;
2076 PcDesc* pd = pc_desc_at(return_pc);
2077 if (pd == NULL)
2078 return false;
2079 return pd->is_method_handle_invoke();
2080 }
2081
2082
2083 // -----------------------------------------------------------------------------
2084 // Verification
2085
2086 class VerifyOopsClosure: public OopClosure {
2087 nmethod* _nm;
2088 bool _ok;
2089 public:
2090 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
2091 bool ok() { return _ok; }
2092 virtual void do_oop(oop* p) {
2093 if ((*p) == NULL || (*p)->is_oop()) return;
2094 if (_ok) {
2095 _nm->print_nmethod(true);
2096 _ok = false;
2097 }
2098 tty->print_cr("*** non-oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)",
2099 (intptr_t)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm));
2100 }
2101 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2102 };
2103
2104 void nmethod::verify() {
2105
2106 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant
2107 // seems odd.
2108
2109 if( is_zombie() || is_not_entrant() )
2110 return;
2111
2112 // Make sure all the entry points are correctly aligned for patching.
2113 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
2114
2115 assert(method()->is_oop(), "must be valid");
2116
2117 ResourceMark rm;
2118
2119 if (!CodeCache::contains(this)) {
2120 fatal1("nmethod at " INTPTR_FORMAT " not in zone", this);
2121 }
2122
2123 if(is_native_method() )
2124 return;
2125
2126 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
2127 if (nm != this) {
2128 fatal1("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", this);
2129 }
2130
2131 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2132 if (! p->verify(this)) {
2133 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", this);
2134 }
2135 }
2136
2137 VerifyOopsClosure voc(this);
2138 oops_do(&voc);
2139 assert(voc.ok(), "embedded oops must be OK");
2140 verify_scavenge_root_oops();
2141
2142 verify_scopes();
2143 }
2144
2145
2146 void nmethod::verify_interrupt_point(address call_site) {
2147 // This code does not work in release mode since
2148 // owns_lock only is available in debug mode.
2149 CompiledIC* ic = NULL;
2150 Thread *cur = Thread::current();
2151 if (CompiledIC_lock->owner() == cur ||
2152 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) &&
2153 SafepointSynchronize::is_at_safepoint())) {
2154 ic = CompiledIC_at(call_site);
2155 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
2156 } else {
2157 MutexLocker ml_verify (CompiledIC_lock);
2158 ic = CompiledIC_at(call_site);
2159 }
2160 PcDesc* pd = pc_desc_at(ic->end_of_call());
2161 assert(pd != NULL, "PcDesc must exist");
2162 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(),
2163 pd->obj_decode_offset(), pd->should_reexecute(),
2164 pd->return_oop());
2165 !sd->is_top(); sd = sd->sender()) {
2166 sd->verify();
2167 }
2168 }
2169
2170 void nmethod::verify_scopes() {
2171 if( !method() ) return; // Runtime stubs have no scope
2172 if (method()->is_native()) return; // Ignore stub methods.
2173 // iterate through all interrupt point
2174 // and verify the debug information is valid.
2175 RelocIterator iter((nmethod*)this);
2176 while (iter.next()) {
2177 address stub = NULL;
2178 switch (iter.type()) {
2179 case relocInfo::virtual_call_type:
2180 verify_interrupt_point(iter.addr());
2181 break;
2182 case relocInfo::opt_virtual_call_type:
2183 stub = iter.opt_virtual_call_reloc()->static_stub();
2184 verify_interrupt_point(iter.addr());
2185 break;
2186 case relocInfo::static_call_type:
2187 stub = iter.static_call_reloc()->static_stub();
2188 //verify_interrupt_point(iter.addr());
2189 break;
2190 case relocInfo::runtime_call_type:
2191 address destination = iter.reloc()->value();
2192 // Right now there is no way to find out which entries support
2193 // an interrupt point. It would be nice if we had this
2194 // information in a table.
2195 break;
2196 }
2197 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section");
2198 }
2199 }
2200
2201
2202 // -----------------------------------------------------------------------------
2203 // Non-product code
2204 #ifndef PRODUCT
2205
2206 class DebugScavengeRoot: public OopClosure {
2207 nmethod* _nm;
2208 bool _ok;
2209 public:
2210 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { }
2211 bool ok() { return _ok; }
2212 virtual void do_oop(oop* p) {
2213 if ((*p) == NULL || !(*p)->is_scavengable()) return;
2214 if (_ok) {
2215 _nm->print_nmethod(true);
2216 _ok = false;
2217 }
2218 tty->print_cr("*** non-perm oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)",
2219 (intptr_t)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm));
2220 (*p)->print();
2221 }
2222 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2223 };
2224
2225 void nmethod::verify_scavenge_root_oops() {
2226 if (!on_scavenge_root_list()) {
2227 // Actually look inside, to verify the claim that it's clean.
2228 DebugScavengeRoot debug_scavenge_root(this);
2229 oops_do(&debug_scavenge_root);
2230 if (!debug_scavenge_root.ok())
2231 fatal("found an unadvertised bad non-perm oop in the code cache");
2232 }
2233 assert(scavenge_root_not_marked(), "");
2234 }
2235
2236 #endif // PRODUCT
2237
2238 // Printing operations
2239
2240 void nmethod::print() const {
2241 ResourceMark rm;
2242 ttyLocker ttyl; // keep the following output all in one block
2243
2244 tty->print("Compiled ");
2245
2246 if (is_compiled_by_c1()) {
2247 tty->print("(c1) ");
2248 } else if (is_compiled_by_c2()) {
2249 tty->print("(c2) ");
2250 } else {
2251 tty->print("(nm) ");
2252 }
2253
2254 print_on(tty, "nmethod");
2255 tty->cr();
2256 if (WizardMode) {
2257 tty->print("((nmethod*) "INTPTR_FORMAT ") ", this);
2258 tty->print(" for method " INTPTR_FORMAT , (address)method());
2259 tty->print(" { ");
2260 if (version()) tty->print("v%d ", version());
2261 if (level()) tty->print("l%d ", level());
2262 if (is_in_use()) tty->print("in_use ");
2263 if (is_not_entrant()) tty->print("not_entrant ");
2264 if (is_zombie()) tty->print("zombie ");
2265 if (is_unloaded()) tty->print("unloaded ");
2266 if (on_scavenge_root_list()) tty->print("scavenge_root ");
2267 tty->print_cr("}:");
2268 }
2269 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2270 (address)this,
2271 (address)this + size(),
2272 size());
2273 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2274 relocation_begin(),
2275 relocation_end(),
2276 relocation_size());
2277 if (code_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2278 code_begin(),
2279 code_end(),
2280 code_size());
2281 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2282 stub_begin(),
2283 stub_end(),
2284 stub_size());
2285 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2286 consts_begin(),
2287 consts_end(),
2288 consts_size());
2289 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2290 scopes_data_begin(),
2291 scopes_data_end(),
2292 scopes_data_size());
2293 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2294 scopes_pcs_begin(),
2295 scopes_pcs_end(),
2296 scopes_pcs_size());
2297 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2298 dependencies_begin(),
2299 dependencies_end(),
2300 dependencies_size());
2301 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2302 handler_table_begin(),
2303 handler_table_end(),
2304 handler_table_size());
2305 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2306 nul_chk_table_begin(),
2307 nul_chk_table_end(),
2308 nul_chk_table_size());
2309 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2310 oops_begin(),
2311 oops_end(),
2312 oops_size());
2313 }
2314
2315 void nmethod::print_code() {
2316 HandleMark hm;
2317 ResourceMark m;
2318 Disassembler::decode(this);
2319 }
2320
2321
2322 #ifndef PRODUCT
2323
2324 void nmethod::print_scopes() {
2325 // Find the first pc desc for all scopes in the code and print it.
2326 ResourceMark rm;
2327 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2328 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
2329 continue;
2330
2331 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
2332 sd->print_on(tty, p);
2333 }
2334 }
2335
2336 void nmethod::print_dependencies() {
2337 ResourceMark rm;
2338 ttyLocker ttyl; // keep the following output all in one block
2339 tty->print_cr("Dependencies:");
2340 for (Dependencies::DepStream deps(this); deps.next(); ) {
2341 deps.print_dependency();
2342 klassOop ctxk = deps.context_type();
2343 if (ctxk != NULL) {
2344 Klass* k = Klass::cast(ctxk);
2345 if (k->oop_is_instance() && ((instanceKlass*)k)->is_dependent_nmethod(this)) {
2346 tty->print_cr(" [nmethod<=klass]%s", k->external_name());
2347 }
2348 }
2349 deps.log_dependency(); // put it into the xml log also
2350 }
2351 }
2352
2353
2354 void nmethod::print_relocations() {
2355 ResourceMark m; // in case methods get printed via the debugger
2356 tty->print_cr("relocations:");
2357 RelocIterator iter(this);
2358 iter.print();
2359 if (UseRelocIndex) {
2360 jint* index_end = (jint*)relocation_end() - 1;
2361 jint index_size = *index_end;
2362 jint* index_start = (jint*)( (address)index_end - index_size );
2363 tty->print_cr(" index @" INTPTR_FORMAT ": index_size=%d", index_start, index_size);
2364 if (index_size > 0) {
2365 jint* ip;
2366 for (ip = index_start; ip+2 <= index_end; ip += 2)
2367 tty->print_cr(" (%d %d) addr=" INTPTR_FORMAT " @" INTPTR_FORMAT,
2368 ip[0],
2369 ip[1],
2370 header_end()+ip[0],
2371 relocation_begin()-1+ip[1]);
2372 for (; ip < index_end; ip++)
2373 tty->print_cr(" (%d ?)", ip[0]);
2374 tty->print_cr(" @" INTPTR_FORMAT ": index_size=%d", ip, *ip++);
2375 tty->print_cr("reloc_end @" INTPTR_FORMAT ":", ip);
2376 }
2377 }
2378 }
2379
2380
2381 void nmethod::print_pcs() {
2382 ResourceMark m; // in case methods get printed via debugger
2383 tty->print_cr("pc-bytecode offsets:");
2384 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2385 p->print(this);
2386 }
2387 }
2388
2389 #endif // PRODUCT
2390
2391 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
2392 RelocIterator iter(this, begin, end);
2393 bool have_one = false;
2394 while (iter.next()) {
2395 have_one = true;
2396 switch (iter.type()) {
2397 case relocInfo::none: return "no_reloc";
2398 case relocInfo::oop_type: {
2399 stringStream st;
2400 oop_Relocation* r = iter.oop_reloc();
2401 oop obj = r->oop_value();
2402 st.print("oop(");
2403 if (obj == NULL) st.print("NULL");
2404 else obj->print_value_on(&st);
2405 st.print(")");
2406 return st.as_string();
2407 }
2408 case relocInfo::virtual_call_type: return "virtual_call";
2409 case relocInfo::opt_virtual_call_type: return "optimized virtual_call";
2410 case relocInfo::static_call_type: return "static_call";
2411 case relocInfo::static_stub_type: return "static_stub";
2412 case relocInfo::runtime_call_type: return "runtime_call";
2413 case relocInfo::external_word_type: return "external_word";
2414 case relocInfo::internal_word_type: return "internal_word";
2415 case relocInfo::section_word_type: return "section_word";
2416 case relocInfo::poll_type: return "poll";
2417 case relocInfo::poll_return_type: return "poll_return";
2418 case relocInfo::type_mask: return "type_bit_mask";
2419 }
2420 }
2421 return have_one ? "other" : NULL;
2422 }
2423
2424 // Return a the last scope in (begin..end]
2425 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
2426 PcDesc* p = pc_desc_near(begin+1);
2427 if (p != NULL && p->real_pc(this) <= end) {
2428 return new ScopeDesc(this, p->scope_decode_offset(),
2429 p->obj_decode_offset(), p->should_reexecute(),
2430 p->return_oop());
2431 }
2432 return NULL;
2433 }
2434
2435 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) {
2436 if (block_begin == entry_point()) stream->print_cr("[Entry Point]");
2437 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]");
2438 if (block_begin == exception_begin()) stream->print_cr("[Exception Handler]");
2439 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]");
2440 if (block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]");
2441 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]");
2442 if (block_begin == consts_begin()) stream->print_cr("[Constants]");
2443 if (block_begin == entry_point()) {
2444 methodHandle m = method();
2445 if (m.not_null()) {
2446 stream->print(" # ");
2447 m->print_value_on(stream);
2448 stream->cr();
2449 }
2450 if (m.not_null() && !is_osr_method()) {
2451 ResourceMark rm;
2452 int sizeargs = m->size_of_parameters();
2453 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
2454 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
2455 {
2456 int sig_index = 0;
2457 if (!m->is_static())
2458 sig_bt[sig_index++] = T_OBJECT; // 'this'
2459 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) {
2460 BasicType t = ss.type();
2461 sig_bt[sig_index++] = t;
2462 if (type2size[t] == 2) {
2463 sig_bt[sig_index++] = T_VOID;
2464 } else {
2465 assert(type2size[t] == 1, "size is 1 or 2");
2466 }
2467 }
2468 assert(sig_index == sizeargs, "");
2469 }
2470 const char* spname = "sp"; // make arch-specific?
2471 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false);
2472 int stack_slot_offset = this->frame_size() * wordSize;
2473 int tab1 = 14, tab2 = 24;
2474 int sig_index = 0;
2475 int arg_index = (m->is_static() ? 0 : -1);
2476 bool did_old_sp = false;
2477 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) {
2478 bool at_this = (arg_index == -1);
2479 bool at_old_sp = false;
2480 BasicType t = (at_this ? T_OBJECT : ss.type());
2481 assert(t == sig_bt[sig_index], "sigs in sync");
2482 if (at_this)
2483 stream->print(" # this: ");
2484 else
2485 stream->print(" # parm%d: ", arg_index);
2486 stream->move_to(tab1);
2487 VMReg fst = regs[sig_index].first();
2488 VMReg snd = regs[sig_index].second();
2489 if (fst->is_reg()) {
2490 stream->print("%s", fst->name());
2491 if (snd->is_valid()) {
2492 stream->print(":%s", snd->name());
2493 }
2494 } else if (fst->is_stack()) {
2495 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
2496 if (offset == stack_slot_offset) at_old_sp = true;
2497 stream->print("[%s+0x%x]", spname, offset);
2498 } else {
2499 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
2500 }
2501 stream->print(" ");
2502 stream->move_to(tab2);
2503 stream->print("= ");
2504 if (at_this) {
2505 m->method_holder()->print_value_on(stream);
2506 } else {
2507 bool did_name = false;
2508 if (!at_this && ss.is_object()) {
2509 symbolOop name = ss.as_symbol_or_null();
2510 if (name != NULL) {
2511 name->print_value_on(stream);
2512 did_name = true;
2513 }
2514 }
2515 if (!did_name)
2516 stream->print("%s", type2name(t));
2517 }
2518 if (at_old_sp) {
2519 stream->print(" (%s of caller)", spname);
2520 did_old_sp = true;
2521 }
2522 stream->cr();
2523 sig_index += type2size[t];
2524 arg_index += 1;
2525 if (!at_this) ss.next();
2526 }
2527 if (!did_old_sp) {
2528 stream->print(" # ");
2529 stream->move_to(tab1);
2530 stream->print("[%s+0x%x]", spname, stack_slot_offset);
2531 stream->print(" (%s of caller)", spname);
2532 stream->cr();
2533 }
2534 }
2535 }
2536 }
2537
2538 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) {
2539 // First, find an oopmap in (begin, end].
2540 // We use the odd half-closed interval so that oop maps and scope descs
2541 // which are tied to the byte after a call are printed with the call itself.
2542 address base = instructions_begin();
2543 OopMapSet* oms = oop_maps();
2544 if (oms != NULL) {
2545 for (int i = 0, imax = oms->size(); i < imax; i++) {
2546 OopMap* om = oms->at(i);
2547 address pc = base + om->offset();
2548 if (pc > begin) {
2549 if (pc <= end) {
2550 st->move_to(column);
2551 st->print("; ");
2552 om->print_on(st);
2553 }
2554 break;
2555 }
2556 }
2557 }
2558
2559 // Print any debug info present at this pc.
2560 ScopeDesc* sd = scope_desc_in(begin, end);
2561 if (sd != NULL) {
2562 st->move_to(column);
2563 if (sd->bci() == SynchronizationEntryBCI) {
2564 st->print(";*synchronization entry");
2565 } else {
2566 if (sd->method().is_null()) {
2567 st->print("method is NULL");
2568 } else if (sd->method()->is_native()) {
2569 st->print("method is native");
2570 } else {
2571 address bcp = sd->method()->bcp_from(sd->bci());
2572 Bytecodes::Code bc = Bytecodes::java_code_at(bcp);
2573 st->print(";*%s", Bytecodes::name(bc));
2574 switch (bc) {
2575 case Bytecodes::_invokevirtual:
2576 case Bytecodes::_invokespecial:
2577 case Bytecodes::_invokestatic:
2578 case Bytecodes::_invokeinterface:
2579 {
2580 Bytecode_invoke* invoke = Bytecode_invoke_at(sd->method(), sd->bci());
2581 st->print(" ");
2582 if (invoke->name() != NULL)
2583 invoke->name()->print_symbol_on(st);
2584 else
2585 st->print("<UNKNOWN>");
2586 break;
2587 }
2588 case Bytecodes::_getfield:
2589 case Bytecodes::_putfield:
2590 case Bytecodes::_getstatic:
2591 case Bytecodes::_putstatic:
2592 {
2593 methodHandle sdm = sd->method();
2594 Bytecode_field* field = Bytecode_field_at(sdm(), sdm->bcp_from(sd->bci()));
2595 constantPoolOop sdmc = sdm->constants();
2596 symbolOop name = sdmc->name_ref_at(field->index());
2597 st->print(" ");
2598 if (name != NULL)
2599 name->print_symbol_on(st);
2600 else
2601 st->print("<UNKNOWN>");
2602 }
2603 }
2604 }
2605 }
2606
2607 // Print all scopes
2608 for (;sd != NULL; sd = sd->sender()) {
2609 st->move_to(column);
2610 st->print("; -");
2611 if (sd->method().is_null()) {
2612 st->print("method is NULL");
2613 } else {
2614 sd->method()->print_short_name(st);
2615 }
2616 int lineno = sd->method()->line_number_from_bci(sd->bci());
2617 if (lineno != -1) {
2618 st->print("@%d (line %d)", sd->bci(), lineno);
2619 } else {
2620 st->print("@%d", sd->bci());
2621 }
2622 st->cr();
2623 }
2624 }
2625
2626 // Print relocation information
2627 const char* str = reloc_string_for(begin, end);
2628 if (str != NULL) {
2629 if (sd != NULL) st->cr();
2630 st->move_to(column);
2631 st->print("; {%s}", str);
2632 }
2633 int cont_offset = ImplicitExceptionTable(this).at(begin - instructions_begin());
2634 if (cont_offset != 0) {
2635 st->move_to(column);
2636 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, instructions_begin() + cont_offset);
2637 }
2638
2639 }
2640
2641 #ifndef PRODUCT
2642
2643 void nmethod::print_value_on(outputStream* st) const {
2644 print_on(st, "nmethod");
2645 }
2646
2647 void nmethod::print_calls(outputStream* st) {
2648 RelocIterator iter(this);
2649 while (iter.next()) {
2650 switch (iter.type()) {
2651 case relocInfo::virtual_call_type:
2652 case relocInfo::opt_virtual_call_type: {
2653 VerifyMutexLocker mc(CompiledIC_lock);
2654 CompiledIC_at(iter.reloc())->print();
2655 break;
2656 }
2657 case relocInfo::static_call_type:
2658 st->print_cr("Static call at " INTPTR_FORMAT, iter.reloc()->addr());
2659 compiledStaticCall_at(iter.reloc())->print();
2660 break;
2661 }
2662 }
2663 }
2664
2665 void nmethod::print_handler_table() {
2666 ExceptionHandlerTable(this).print();
2667 }
2668
2669 void nmethod::print_nul_chk_table() {
2670 ImplicitExceptionTable(this).print(instructions_begin());
2671 }
2672
2673 void nmethod::print_statistics() {
2674 ttyLocker ttyl;
2675 if (xtty != NULL) xtty->head("statistics type='nmethod'");
2676 nmethod_stats.print_native_nmethod_stats();
2677 nmethod_stats.print_nmethod_stats();
2678 DebugInformationRecorder::print_statistics();
2679 nmethod_stats.print_pc_stats();
2680 Dependencies::print_statistics();
2681 if (xtty != NULL) xtty->tail("statistics");
2682 }
2683
2684 #endif // PRODUCT