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