1 /*
2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 # include "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 bool nmethod::is_compiled_by_shark() const {
69 if (is_native_method()) return false;
70 assert(compiler() != NULL, "must be");
71 return compiler()->is_shark();
72 }
73
74
75
76 //---------------------------------------------------------------------------------
77 // NMethod statistics
78 // They are printed under various flags, including:
79 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation.
80 // (In the latter two cases, they like other stats are printed to the log only.)
81
82 #ifndef PRODUCT
83 // These variables are put into one block to reduce relocations
84 // and make it simpler to print from the debugger.
85 static
86 struct nmethod_stats_struct {
87 int nmethod_count;
88 int total_size;
89 int relocation_size;
90 int consts_size;
91 int insts_size;
92 int stub_size;
93 int scopes_data_size;
94 int scopes_pcs_size;
95 int dependencies_size;
96 int handler_table_size;
97 int nul_chk_table_size;
98 int oops_size;
99
100 void note_nmethod(nmethod* nm) {
101 nmethod_count += 1;
102 total_size += nm->size();
103 relocation_size += nm->relocation_size();
104 consts_size += nm->consts_size();
105 insts_size += nm->insts_size();
106 stub_size += nm->stub_size();
107 oops_size += nm->oops_size();
108 scopes_data_size += nm->scopes_data_size();
109 scopes_pcs_size += nm->scopes_pcs_size();
110 dependencies_size += nm->dependencies_size();
111 handler_table_size += nm->handler_table_size();
112 nul_chk_table_size += nm->nul_chk_table_size();
113 }
114 void print_nmethod_stats() {
115 if (nmethod_count == 0) return;
116 tty->print_cr("Statistics for %d bytecoded nmethods:", nmethod_count);
117 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size);
118 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size);
119 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size);
120 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size);
121 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size);
122 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size);
123 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size);
124 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size);
125 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size);
126 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size);
127 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size);
128 }
129
130 int native_nmethod_count;
131 int native_total_size;
132 int native_relocation_size;
133 int native_insts_size;
134 int native_oops_size;
135 void note_native_nmethod(nmethod* nm) {
136 native_nmethod_count += 1;
137 native_total_size += nm->size();
138 native_relocation_size += nm->relocation_size();
139 native_insts_size += nm->insts_size();
140 native_oops_size += nm->oops_size();
141 }
142 void print_native_nmethod_stats() {
143 if (native_nmethod_count == 0) return;
144 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count);
145 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size);
146 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size);
147 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size);
148 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size);
149 }
150
151 int pc_desc_resets; // number of resets (= number of caches)
152 int pc_desc_queries; // queries to nmethod::find_pc_desc
153 int pc_desc_approx; // number of those which have approximate true
154 int pc_desc_repeats; // number of _last_pc_desc hits
155 int pc_desc_hits; // number of LRU cache hits
156 int pc_desc_tests; // total number of PcDesc examinations
157 int pc_desc_searches; // total number of quasi-binary search steps
158 int pc_desc_adds; // number of LUR cache insertions
159
160 void print_pc_stats() {
161 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query",
162 pc_desc_queries,
163 (double)(pc_desc_tests + pc_desc_searches)
164 / pc_desc_queries);
165 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d",
166 pc_desc_resets,
167 pc_desc_queries, pc_desc_approx,
168 pc_desc_repeats, pc_desc_hits,
169 pc_desc_tests, pc_desc_searches, pc_desc_adds);
170 }
171 } nmethod_stats;
172 #endif //PRODUCT
173
174 //---------------------------------------------------------------------------------
175
176
177 // The _unwind_handler is a special marker address, which says that
178 // for given exception oop and address, the frame should be removed
179 // as the tuple cannot be caught in the nmethod
180 address ExceptionCache::_unwind_handler = (address) -1;
181
182
183 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) {
184 assert(pc != NULL, "Must be non null");
185 assert(exception.not_null(), "Must be non null");
186 assert(handler != NULL, "Must be non null");
187
188 _count = 0;
189 _exception_type = exception->klass();
190 _next = NULL;
191
192 add_address_and_handler(pc,handler);
193 }
194
195
196 address ExceptionCache::match(Handle exception, address pc) {
197 assert(pc != NULL,"Must be non null");
198 assert(exception.not_null(),"Must be non null");
199 if (exception->klass() == exception_type()) {
200 return (test_address(pc));
201 }
202
203 return NULL;
204 }
205
206
207 bool ExceptionCache::match_exception_with_space(Handle exception) {
208 assert(exception.not_null(),"Must be non null");
209 if (exception->klass() == exception_type() && count() < cache_size) {
210 return true;
211 }
212 return false;
213 }
214
215
216 address ExceptionCache::test_address(address addr) {
217 for (int i=0; i<count(); i++) {
218 if (pc_at(i) == addr) {
219 return handler_at(i);
220 }
221 }
222 return NULL;
223 }
224
225
226 bool ExceptionCache::add_address_and_handler(address addr, address handler) {
227 if (test_address(addr) == handler) return true;
228 if (count() < cache_size) {
229 set_pc_at(count(),addr);
230 set_handler_at(count(), handler);
231 increment_count();
232 return true;
233 }
234 return false;
235 }
236
237
238 // private method for handling exception cache
239 // These methods are private, and used to manipulate the exception cache
240 // directly.
241 ExceptionCache* nmethod::exception_cache_entry_for_exception(Handle exception) {
242 ExceptionCache* ec = exception_cache();
243 while (ec != NULL) {
244 if (ec->match_exception_with_space(exception)) {
245 return ec;
246 }
247 ec = ec->next();
248 }
249 return NULL;
250 }
251
252
253 //-----------------------------------------------------------------------------
254
255
256 // Helper used by both find_pc_desc methods.
257 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) {
258 NOT_PRODUCT(++nmethod_stats.pc_desc_tests);
259 if (!approximate)
260 return pc->pc_offset() == pc_offset;
261 else
262 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset();
263 }
264
265 void PcDescCache::reset_to(PcDesc* initial_pc_desc) {
266 if (initial_pc_desc == NULL) {
267 _last_pc_desc = NULL; // native method
268 return;
269 }
270 NOT_PRODUCT(++nmethod_stats.pc_desc_resets);
271 // reset the cache by filling it with benign (non-null) values
272 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel");
273 _last_pc_desc = initial_pc_desc + 1; // first valid one is after sentinel
274 for (int i = 0; i < cache_size; i++)
275 _pc_descs[i] = initial_pc_desc;
276 }
277
278 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) {
279 NOT_PRODUCT(++nmethod_stats.pc_desc_queries);
280 NOT_PRODUCT(if (approximate) ++nmethod_stats.pc_desc_approx);
281
282 // In order to prevent race conditions do not load cache elements
283 // repeatedly, but use a local copy:
284 PcDesc* res;
285
286 // Step one: Check the most recently returned value.
287 res = _last_pc_desc;
288 if (res == NULL) return NULL; // native method; no PcDescs at all
289 if (match_desc(res, pc_offset, approximate)) {
290 NOT_PRODUCT(++nmethod_stats.pc_desc_repeats);
291 return res;
292 }
293
294 // Step two: Check the LRU cache.
295 for (int i = 0; i < cache_size; i++) {
296 res = _pc_descs[i];
297 if (res->pc_offset() < 0) break; // optimization: skip empty cache
298 if (match_desc(res, pc_offset, approximate)) {
299 NOT_PRODUCT(++nmethod_stats.pc_desc_hits);
300 _last_pc_desc = res; // record this cache hit in case of repeat
301 return res;
302 }
303 }
304
305 // Report failure.
306 return NULL;
307 }
308
309 void PcDescCache::add_pc_desc(PcDesc* pc_desc) {
310 NOT_PRODUCT(++nmethod_stats.pc_desc_adds);
311 // Update the LRU cache by shifting pc_desc forward:
312 for (int i = 0; i < cache_size; i++) {
313 PcDesc* next = _pc_descs[i];
314 _pc_descs[i] = pc_desc;
315 pc_desc = next;
316 }
317 // Note: Do not update _last_pc_desc. It fronts for the LRU cache.
318 }
319
320 // adjust pcs_size so that it is a multiple of both oopSize and
321 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple
322 // of oopSize, then 2*sizeof(PcDesc) is)
323 static int adjust_pcs_size(int pcs_size) {
324 int nsize = round_to(pcs_size, oopSize);
325 if ((nsize % sizeof(PcDesc)) != 0) {
326 nsize = pcs_size + sizeof(PcDesc);
327 }
328 assert((nsize % oopSize) == 0, "correct alignment");
329 return nsize;
330 }
331
332 //-----------------------------------------------------------------------------
333
334
335 void nmethod::add_exception_cache_entry(ExceptionCache* new_entry) {
336 assert(ExceptionCache_lock->owned_by_self(),"Must hold the ExceptionCache_lock");
337 assert(new_entry != NULL,"Must be non null");
338 assert(new_entry->next() == NULL, "Must be null");
339
340 if (exception_cache() != NULL) {
341 new_entry->set_next(exception_cache());
342 }
343 set_exception_cache(new_entry);
344 }
345
346 void nmethod::remove_from_exception_cache(ExceptionCache* ec) {
347 ExceptionCache* prev = NULL;
348 ExceptionCache* curr = exception_cache();
349 assert(curr != NULL, "nothing to remove");
350 // find the previous and next entry of ec
351 while (curr != ec) {
352 prev = curr;
353 curr = curr->next();
354 assert(curr != NULL, "ExceptionCache not found");
355 }
356 // now: curr == ec
357 ExceptionCache* next = curr->next();
358 if (prev == NULL) {
359 set_exception_cache(next);
360 } else {
361 prev->set_next(next);
362 }
363 delete curr;
364 }
365
366
367 // public method for accessing the exception cache
368 // These are the public access methods.
369 address nmethod::handler_for_exception_and_pc(Handle exception, address pc) {
370 // We never grab a lock to read the exception cache, so we may
371 // have false negatives. This is okay, as it can only happen during
372 // the first few exception lookups for a given nmethod.
373 ExceptionCache* ec = exception_cache();
374 while (ec != NULL) {
375 address ret_val;
376 if ((ret_val = ec->match(exception,pc)) != NULL) {
377 return ret_val;
378 }
379 ec = ec->next();
380 }
381 return NULL;
382 }
383
384
385 void nmethod::add_handler_for_exception_and_pc(Handle exception, address pc, address handler) {
386 // There are potential race conditions during exception cache updates, so we
387 // must own the ExceptionCache_lock before doing ANY modifications. Because
388 // we don't lock during reads, it is possible to have several threads attempt
389 // to update the cache with the same data. We need to check for already inserted
390 // copies of the current data before adding it.
391
392 MutexLocker ml(ExceptionCache_lock);
393 ExceptionCache* target_entry = exception_cache_entry_for_exception(exception);
394
395 if (target_entry == NULL || !target_entry->add_address_and_handler(pc,handler)) {
396 target_entry = new ExceptionCache(exception,pc,handler);
397 add_exception_cache_entry(target_entry);
398 }
399 }
400
401
402 //-------------end of code for ExceptionCache--------------
403
404
405 int nmethod::total_size() const {
406 return
407 consts_size() +
408 insts_size() +
409 stub_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 // Fill in default values for various flag fields
423 void nmethod::init_defaults() {
424 _state = alive;
425 _marked_for_reclamation = 0;
426 _has_flushed_dependencies = 0;
427 _speculatively_disconnected = 0;
428 _has_unsafe_access = 0;
429 _has_method_handle_invokes = 0;
430 _marked_for_deoptimization = 0;
431 _lock_count = 0;
432 _stack_traversal_mark = 0;
433 _unload_reported = false; // jvmti state
434
435 NOT_PRODUCT(_has_debug_info = false);
436 #ifdef ASSERT
437 _oops_are_stale = false;
438 #endif
439
440 _oops_do_mark_link = NULL;
441 _jmethod_id = NULL;
442 _osr_link = NULL;
443 _scavenge_root_link = NULL;
444 _scavenge_root_state = 0;
445 _saved_nmethod_link = NULL;
446 _compiler = NULL;
447
448 #ifdef HAVE_DTRACE_H
449 _trap_offset = 0;
450 #endif // def HAVE_DTRACE_H
451 }
452
453
454 nmethod* nmethod::new_native_nmethod(methodHandle method,
455 CodeBuffer *code_buffer,
456 int vep_offset,
457 int frame_complete,
458 int frame_size,
459 ByteSize basic_lock_owner_sp_offset,
460 ByteSize basic_lock_sp_offset,
461 OopMapSet* oop_maps) {
462 // create nmethod
463 nmethod* nm = NULL;
464 {
465 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
466 int native_nmethod_size = allocation_size(code_buffer, sizeof(nmethod));
467 CodeOffsets offsets;
468 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
469 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
470 nm = new (native_nmethod_size)
471 nmethod(method(), native_nmethod_size, &offsets,
472 code_buffer, frame_size,
473 basic_lock_owner_sp_offset, basic_lock_sp_offset,
474 oop_maps);
475 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_native_nmethod(nm));
476 if (PrintAssembly && nm != NULL)
477 Disassembler::decode(nm);
478 }
479 // verify nmethod
480 debug_only(if (nm) nm->verify();) // might block
481
482 if (nm != NULL) {
483 nm->log_new_nmethod();
484 }
485
486 return nm;
487 }
488
489 #ifdef HAVE_DTRACE_H
490 nmethod* nmethod::new_dtrace_nmethod(methodHandle method,
491 CodeBuffer *code_buffer,
492 int vep_offset,
493 int trap_offset,
494 int frame_complete,
495 int frame_size) {
496 // create nmethod
497 nmethod* nm = NULL;
498 {
499 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
500 int nmethod_size = allocation_size(code_buffer, sizeof(nmethod));
501 CodeOffsets offsets;
502 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
503 offsets.set_value(CodeOffsets::Dtrace_trap, trap_offset);
504 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
505
506 nm = new (nmethod_size) nmethod(method(), nmethod_size, &offsets, code_buffer, frame_size);
507
508 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_nmethod(nm));
509 if (PrintAssembly && nm != NULL)
510 Disassembler::decode(nm);
511 }
512 // verify nmethod
513 debug_only(if (nm) nm->verify();) // might block
514
515 if (nm != NULL) {
516 nm->log_new_nmethod();
517 }
518
519 return nm;
520 }
521
522 #endif // def HAVE_DTRACE_H
523
524 nmethod* nmethod::new_nmethod(methodHandle method,
525 int compile_id,
526 int entry_bci,
527 CodeOffsets* offsets,
528 int orig_pc_offset,
529 DebugInformationRecorder* debug_info,
530 Dependencies* dependencies,
531 CodeBuffer* code_buffer, int frame_size,
532 OopMapSet* oop_maps,
533 ExceptionHandlerTable* handler_table,
534 ImplicitExceptionTable* nul_chk_table,
535 AbstractCompiler* compiler,
536 int comp_level
537 )
538 {
539 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
540 // create nmethod
541 nmethod* nm = NULL;
542 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
543 int nmethod_size =
544 allocation_size(code_buffer, sizeof(nmethod))
545 + adjust_pcs_size(debug_info->pcs_size())
546 + round_to(dependencies->size_in_bytes() , oopSize)
547 + round_to(handler_table->size_in_bytes(), oopSize)
548 + round_to(nul_chk_table->size_in_bytes(), oopSize)
549 + round_to(debug_info->data_size() , oopSize);
550 nm = new (nmethod_size)
551 nmethod(method(), nmethod_size, compile_id, entry_bci, offsets,
552 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size,
553 oop_maps,
554 handler_table,
555 nul_chk_table,
556 compiler,
557 comp_level);
558 if (nm != NULL) {
559 // To make dependency checking during class loading fast, record
560 // the nmethod dependencies in the classes it is dependent on.
561 // This allows the dependency checking code to simply walk the
562 // class hierarchy above the loaded class, checking only nmethods
563 // which are dependent on those classes. The slow way is to
564 // check every nmethod for dependencies which makes it linear in
565 // the number of methods compiled. For applications with a lot
566 // classes the slow way is too slow.
567 for (Dependencies::DepStream deps(nm); deps.next(); ) {
568 klassOop klass = deps.context_type();
569 if (klass == NULL) continue; // ignore things like evol_method
570
571 // record this nmethod as dependent on this klass
572 instanceKlass::cast(klass)->add_dependent_nmethod(nm);
573 }
574 }
575 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_nmethod(nm));
576 if (PrintAssembly && nm != NULL)
577 Disassembler::decode(nm);
578 }
579
580 // verify nmethod
581 debug_only(if (nm) nm->verify();) // might block
582
583 if (nm != NULL) {
584 nm->log_new_nmethod();
585 }
586
587 // done
588 return nm;
589 }
590
591
592 // For native wrappers
593 nmethod::nmethod(
594 methodOop method,
595 int nmethod_size,
596 CodeOffsets* offsets,
597 CodeBuffer* code_buffer,
598 int frame_size,
599 ByteSize basic_lock_owner_sp_offset,
600 ByteSize basic_lock_sp_offset,
601 OopMapSet* oop_maps )
602 : CodeBlob("native nmethod", code_buffer, sizeof(nmethod),
603 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps),
604 _compiled_synchronized_native_basic_lock_owner_sp_offset(basic_lock_owner_sp_offset),
605 _compiled_synchronized_native_basic_lock_sp_offset(basic_lock_sp_offset)
606 {
607 {
608 debug_only(No_Safepoint_Verifier nsv;)
609 assert_locked_or_safepoint(CodeCache_lock);
610
611 init_defaults();
612 _method = method;
613 _entry_bci = InvocationEntryBci;
614 // We have no exception handler or deopt handler make the
615 // values something that will never match a pc like the nmethod vtable entry
616 _exception_offset = 0;
617 _deoptimize_offset = 0;
618 _deoptimize_mh_offset = 0;
619 _orig_pc_offset = 0;
620
621 _consts_offset = data_offset();
622 _stub_offset = data_offset();
623 _oops_offset = data_offset();
624 _scopes_data_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize);
625 _scopes_pcs_offset = _scopes_data_offset;
626 _dependencies_offset = _scopes_pcs_offset;
627 _handler_table_offset = _dependencies_offset;
628 _nul_chk_table_offset = _handler_table_offset;
629 _nmethod_end_offset = _nul_chk_table_offset;
630 _compile_id = 0; // default
631 _comp_level = CompLevel_none;
632 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
633 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
634 _osr_entry_point = NULL;
635 _exception_cache = NULL;
636 _pc_desc_cache.reset_to(NULL);
637
638 code_buffer->copy_oops_to(this);
639 debug_only(verify_scavenge_root_oops());
640 CodeCache::commit(this);
641 }
642
643 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
644 ttyLocker ttyl; // keep the following output all in one block
645 // This output goes directly to the tty, not the compiler log.
646 // To enable tools to match it up with the compilation activity,
647 // be sure to tag this tty output with the compile ID.
648 if (xtty != NULL) {
649 xtty->begin_head("print_native_nmethod");
650 xtty->method(_method);
651 xtty->stamp();
652 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
653 }
654 // print the header part first
655 print();
656 // then print the requested information
657 if (PrintNativeNMethods) {
658 print_code();
659 oop_maps->print();
660 }
661 if (PrintRelocations) {
662 print_relocations();
663 }
664 if (xtty != NULL) {
665 xtty->tail("print_native_nmethod");
666 }
667 }
668 Events::log("Create nmethod " INTPTR_FORMAT, this);
669 }
670
671 // For dtrace wrappers
672 #ifdef HAVE_DTRACE_H
673 nmethod::nmethod(
674 methodOop method,
675 int nmethod_size,
676 CodeOffsets* offsets,
677 CodeBuffer* code_buffer,
678 int frame_size)
679 : CodeBlob("dtrace nmethod", code_buffer, sizeof(nmethod),
680 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, NULL),
681 _compiled_synchronized_native_basic_lock_owner_sp_offset(in_ByteSize(-1)),
682 _compiled_synchronized_native_basic_lock_sp_offset(in_ByteSize(-1))
683 {
684 {
685 debug_only(No_Safepoint_Verifier nsv;)
686 assert_locked_or_safepoint(CodeCache_lock);
687
688 init_defaults();
689 _method = method;
690 _entry_bci = InvocationEntryBci;
691 // We have no exception handler or deopt handler make the
692 // values something that will never match a pc like the nmethod vtable entry
693 _exception_offset = 0;
694 _deoptimize_offset = 0;
695 _deoptimize_mh_offset = 0;
696 _unwind_handler_offset = -1;
697 _trap_offset = offsets->value(CodeOffsets::Dtrace_trap);
698 _orig_pc_offset = 0;
699 _consts_offset = data_offset();
700 _stub_offset = data_offset();
701 _oops_offset = data_offset();
702 _scopes_data_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize);
703 _scopes_pcs_offset = _scopes_data_offset;
704 _dependencies_offset = _scopes_pcs_offset;
705 _handler_table_offset = _dependencies_offset;
706 _nul_chk_table_offset = _handler_table_offset;
707 _nmethod_end_offset = _nul_chk_table_offset;
708 _compile_id = 0; // default
709 _comp_level = CompLevel_none;
710 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
711 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
712 _osr_entry_point = NULL;
713 _exception_cache = NULL;
714 _pc_desc_cache.reset_to(NULL);
715
716 code_buffer->copy_oops_to(this);
717 debug_only(verify_scavenge_root_oops());
718 CodeCache::commit(this);
719 }
720
721 if (PrintNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
722 ttyLocker ttyl; // keep the following output all in one block
723 // This output goes directly to the tty, not the compiler log.
724 // To enable tools to match it up with the compilation activity,
725 // be sure to tag this tty output with the compile ID.
726 if (xtty != NULL) {
727 xtty->begin_head("print_dtrace_nmethod");
728 xtty->method(_method);
729 xtty->stamp();
730 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
731 }
732 // print the header part first
733 print();
734 // then print the requested information
735 if (PrintNMethods) {
736 print_code();
737 }
738 if (PrintRelocations) {
739 print_relocations();
740 }
741 if (xtty != NULL) {
742 xtty->tail("print_dtrace_nmethod");
743 }
744 }
745 Events::log("Create nmethod " INTPTR_FORMAT, this);
746 }
747 #endif // def HAVE_DTRACE_H
748
749 void* nmethod::operator new(size_t size, int nmethod_size) {
750 // Always leave some room in the CodeCache for I2C/C2I adapters
751 if (CodeCache::unallocated_capacity() < CodeCacheMinimumFreeSpace) return NULL;
752 return CodeCache::allocate(nmethod_size);
753 }
754
755
756 nmethod::nmethod(
757 methodOop method,
758 int nmethod_size,
759 int compile_id,
760 int entry_bci,
761 CodeOffsets* offsets,
762 int orig_pc_offset,
763 DebugInformationRecorder* debug_info,
764 Dependencies* dependencies,
765 CodeBuffer *code_buffer,
766 int frame_size,
767 OopMapSet* oop_maps,
768 ExceptionHandlerTable* handler_table,
769 ImplicitExceptionTable* nul_chk_table,
770 AbstractCompiler* compiler,
771 int comp_level
772 )
773 : CodeBlob("nmethod", code_buffer, sizeof(nmethod),
774 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps),
775 _compiled_synchronized_native_basic_lock_owner_sp_offset(in_ByteSize(-1)),
776 _compiled_synchronized_native_basic_lock_sp_offset(in_ByteSize(-1))
777 {
778 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
779 {
780 debug_only(No_Safepoint_Verifier nsv;)
781 assert_locked_or_safepoint(CodeCache_lock);
782
783 init_defaults();
784 _method = method;
785 _entry_bci = entry_bci;
786 _compile_id = compile_id;
787 _comp_level = comp_level;
788 _compiler = compiler;
789 _orig_pc_offset = orig_pc_offset;
790
791 // Section offsets
792 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts());
793 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs());
794
795 // Exception handler and deopt handler are in the stub section
796 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
797 _deoptimize_offset = _stub_offset + offsets->value(CodeOffsets::Deopt);
798 if (has_method_handle_invokes()) {
799 _deoptimize_mh_offset = _stub_offset + offsets->value(CodeOffsets::DeoptMH);
800 } else {
801 _deoptimize_mh_offset = -1;
802 }
803 if (offsets->value(CodeOffsets::UnwindHandler) != -1) {
804 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler);
805 } else {
806 _unwind_handler_offset = -1;
807 }
808
809 _oops_offset = data_offset();
810 _scopes_data_offset = _oops_offset + round_to(code_buffer->total_oop_size (), oopSize);
811 _scopes_pcs_offset = _scopes_data_offset + round_to(debug_info->data_size (), oopSize);
812 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
813 _handler_table_offset = _dependencies_offset + round_to(dependencies->size_in_bytes (), oopSize);
814 _nul_chk_table_offset = _handler_table_offset + round_to(handler_table->size_in_bytes(), oopSize);
815 _nmethod_end_offset = _nul_chk_table_offset + round_to(nul_chk_table->size_in_bytes(), oopSize);
816
817 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
818 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
819 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry);
820 _exception_cache = NULL;
821 _pc_desc_cache.reset_to(scopes_pcs_begin());
822
823 // Copy contents of ScopeDescRecorder to nmethod
824 code_buffer->copy_oops_to(this);
825 debug_info->copy_to(this);
826 dependencies->copy_to(this);
827 if (ScavengeRootsInCode && detect_scavenge_root_oops()) {
828 CodeCache::add_scavenge_root_nmethod(this);
829 }
830 debug_only(verify_scavenge_root_oops());
831
832 CodeCache::commit(this);
833
834 // Copy contents of ExceptionHandlerTable to nmethod
835 handler_table->copy_to(this);
836 nul_chk_table->copy_to(this);
837
838 // we use the information of entry points to find out if a method is
839 // static or non static
840 assert(compiler->is_c2() ||
841 _method->is_static() == (entry_point() == _verified_entry_point),
842 " entry points must be same for static methods and vice versa");
843 }
844
845 bool printnmethods = PrintNMethods
846 || CompilerOracle::should_print(_method)
847 || CompilerOracle::has_option_string(_method, "PrintNMethods");
848 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
849 print_nmethod(printnmethods);
850 }
851
852 // Note: Do not verify in here as the CodeCache_lock is
853 // taken which would conflict with the CompiledIC_lock
854 // which taken during the verification of call sites.
855 // (was bug - gri 10/25/99)
856
857 Events::log("Create nmethod " INTPTR_FORMAT, this);
858 }
859
860
861 // Print a short set of xml attributes to identify this nmethod. The
862 // output should be embedded in some other element.
863 void nmethod::log_identity(xmlStream* log) const {
864 log->print(" compile_id='%d'", compile_id());
865 const char* nm_kind = compile_kind();
866 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind);
867 if (compiler() != NULL) {
868 log->print(" compiler='%s'", compiler()->name());
869 }
870 if (TieredCompilation) {
871 log->print(" level='%d'", comp_level());
872 }
873 }
874
875
876 #define LOG_OFFSET(log, name) \
877 if ((intptr_t)name##_end() - (intptr_t)name##_begin()) \
878 log->print(" " XSTR(name) "_offset='%d'" , \
879 (intptr_t)name##_begin() - (intptr_t)this)
880
881
882 void nmethod::log_new_nmethod() const {
883 if (LogCompilation && xtty != NULL) {
884 ttyLocker ttyl;
885 HandleMark hm;
886 xtty->begin_elem("nmethod");
887 log_identity(xtty);
888 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", code_begin(), size());
889 xtty->print(" address='" INTPTR_FORMAT "'", (intptr_t) this);
890
891 LOG_OFFSET(xtty, relocation);
892 LOG_OFFSET(xtty, consts);
893 LOG_OFFSET(xtty, insts);
894 LOG_OFFSET(xtty, stub);
895 LOG_OFFSET(xtty, scopes_data);
896 LOG_OFFSET(xtty, scopes_pcs);
897 LOG_OFFSET(xtty, dependencies);
898 LOG_OFFSET(xtty, handler_table);
899 LOG_OFFSET(xtty, nul_chk_table);
900 LOG_OFFSET(xtty, oops);
901
902 xtty->method(method());
903 xtty->stamp();
904 xtty->end_elem();
905 }
906 }
907
908 #undef LOG_OFFSET
909
910
911 void nmethod::print_compilation(outputStream *st, const char *method_name, const char *title,
912 methodOop method, bool is_blocking, int compile_id, int bci, int comp_level) {
913 bool is_synchronized = false, has_xhandler = false, is_native = false;
914 int code_size = -1;
915 if (method != NULL) {
916 is_synchronized = method->is_synchronized();
917 has_xhandler = method->has_exception_handler();
918 is_native = method->is_native();
919 code_size = method->code_size();
920 }
921 // print compilation number
922 st->print("%7d %3d", (int)tty->time_stamp().milliseconds(), compile_id);
923
924 // print method attributes
925 const bool is_osr = bci != InvocationEntryBci;
926 const char blocking_char = is_blocking ? 'b' : ' ';
927 const char compile_type = is_osr ? '%' : ' ';
928 const char sync_char = is_synchronized ? 's' : ' ';
929 const char exception_char = has_xhandler ? '!' : ' ';
930 const char native_char = is_native ? 'n' : ' ';
931 st->print("%c%c%c%c%c ", compile_type, sync_char, exception_char, blocking_char, native_char);
932 if (TieredCompilation) {
933 st->print("%d ", comp_level);
934 }
935
936 // print optional title
937 bool do_nl = false;
938 if (title != NULL) {
939 int tlen = (int) strlen(title);
940 bool do_nl = false;
941 if (tlen > 0 && title[tlen-1] == '\n') { tlen--; do_nl = true; }
942 st->print("%.*s", tlen, title);
943 } else {
944 do_nl = true;
945 }
946
947 // print method name string if given
948 if (method_name != NULL) {
949 st->print(method_name);
950 } else {
951 // otherwise as the method to print itself
952 if (method != NULL && !Universe::heap()->is_gc_active()) {
953 method->print_short_name(st);
954 } else {
955 st->print("(method)");
956 }
957 }
958
959 if (method != NULL) {
960 // print osr_bci if any
961 if (is_osr) st->print(" @ %d", bci);
962 // print method size
963 st->print(" (%d bytes)", code_size);
964 }
965 if (do_nl) st->cr();
966 }
967
968 // Print out more verbose output usually for a newly created nmethod.
969 void nmethod::print_on(outputStream* st, const char* title) const {
970 if (st != NULL) {
971 ttyLocker ttyl;
972 print_compilation(st, /*method_name*/NULL, title,
973 method(), /*is_blocking*/false,
974 compile_id(),
975 is_osr_method() ? osr_entry_bci() : InvocationEntryBci,
976 comp_level());
977 if (WizardMode) st->print(" (" INTPTR_FORMAT ")", this);
978 }
979 }
980
981
982 void nmethod::print_nmethod(bool printmethod) {
983 ttyLocker ttyl; // keep the following output all in one block
984 if (xtty != NULL) {
985 xtty->begin_head("print_nmethod");
986 xtty->stamp();
987 xtty->end_head();
988 }
989 // print the header part first
990 print();
991 // then print the requested information
992 if (printmethod) {
993 print_code();
994 print_pcs();
995 oop_maps()->print();
996 }
997 if (PrintDebugInfo) {
998 print_scopes();
999 }
1000 if (PrintRelocations) {
1001 print_relocations();
1002 }
1003 if (PrintDependencies) {
1004 print_dependencies();
1005 }
1006 if (PrintExceptionHandlers) {
1007 print_handler_table();
1008 print_nul_chk_table();
1009 }
1010 if (xtty != NULL) {
1011 xtty->tail("print_nmethod");
1012 }
1013 }
1014
1015
1016 // Promote one word from an assembly-time handle to a live embedded oop.
1017 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
1018 if (handle == NULL ||
1019 // As a special case, IC oops are initialized to 1 or -1.
1020 handle == (jobject) Universe::non_oop_word()) {
1021 (*dest) = (oop) handle;
1022 } else {
1023 (*dest) = JNIHandles::resolve_non_null(handle);
1024 }
1025 }
1026
1027
1028 void nmethod::copy_oops(GrowableArray<jobject>* array) {
1029 //assert(oops_size() == 0, "do this handshake just once, please");
1030 int length = array->length();
1031 assert((address)(oops_begin() + length) <= data_end(), "oops big enough");
1032 oop* dest = oops_begin();
1033 for (int index = 0 ; index < length; index++) {
1034 initialize_immediate_oop(&dest[index], array->at(index));
1035 }
1036
1037 // Now we can fix up all the oops in the code. We need to do this
1038 // in the code because the assembler uses jobjects as placeholders.
1039 // The code and relocations have already been initialized by the
1040 // CodeBlob constructor, so it is valid even at this early point to
1041 // iterate over relocations and patch the code.
1042 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true);
1043 }
1044
1045
1046 bool nmethod::is_at_poll_return(address pc) {
1047 RelocIterator iter(this, pc, pc+1);
1048 while (iter.next()) {
1049 if (iter.type() == relocInfo::poll_return_type)
1050 return true;
1051 }
1052 return false;
1053 }
1054
1055
1056 bool nmethod::is_at_poll_or_poll_return(address pc) {
1057 RelocIterator iter(this, pc, pc+1);
1058 while (iter.next()) {
1059 relocInfo::relocType t = iter.type();
1060 if (t == relocInfo::poll_return_type || t == relocInfo::poll_type)
1061 return true;
1062 }
1063 return false;
1064 }
1065
1066
1067 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) {
1068 // re-patch all oop-bearing instructions, just in case some oops moved
1069 RelocIterator iter(this, begin, end);
1070 while (iter.next()) {
1071 if (iter.type() == relocInfo::oop_type) {
1072 oop_Relocation* reloc = iter.oop_reloc();
1073 if (initialize_immediates && reloc->oop_is_immediate()) {
1074 oop* dest = reloc->oop_addr();
1075 initialize_immediate_oop(dest, (jobject) *dest);
1076 }
1077 // Refresh the oop-related bits of this instruction.
1078 reloc->fix_oop_relocation();
1079 }
1080
1081 // There must not be any interfering patches or breakpoints.
1082 assert(!(iter.type() == relocInfo::breakpoint_type
1083 && iter.breakpoint_reloc()->active()),
1084 "no active breakpoint");
1085 }
1086 }
1087
1088
1089 ScopeDesc* nmethod::scope_desc_at(address pc) {
1090 PcDesc* pd = pc_desc_at(pc);
1091 guarantee(pd != NULL, "scope must be present");
1092 return new ScopeDesc(this, pd->scope_decode_offset(),
1093 pd->obj_decode_offset(), pd->should_reexecute(),
1094 pd->return_oop());
1095 }
1096
1097
1098 void nmethod::clear_inline_caches() {
1099 assert(SafepointSynchronize::is_at_safepoint(), "cleaning of IC's only allowed at safepoint");
1100 if (is_zombie()) {
1101 return;
1102 }
1103
1104 RelocIterator iter(this);
1105 while (iter.next()) {
1106 iter.reloc()->clear_inline_cache();
1107 }
1108 }
1109
1110
1111 void nmethod::cleanup_inline_caches() {
1112
1113 assert_locked_or_safepoint(CompiledIC_lock);
1114
1115 // If the method is not entrant or zombie then a JMP is plastered over the
1116 // first few bytes. If an oop in the old code was there, that oop
1117 // should not get GC'd. Skip the first few bytes of oops on
1118 // not-entrant methods.
1119 address low_boundary = verified_entry_point();
1120 if (!is_in_use()) {
1121 low_boundary += NativeJump::instruction_size;
1122 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1123 // This means that the low_boundary is going to be a little too high.
1124 // This shouldn't matter, since oops of non-entrant methods are never used.
1125 // In fact, why are we bothering to look at oops in a non-entrant method??
1126 }
1127
1128 // Find all calls in an nmethod, and clear the ones that points to zombie methods
1129 ResourceMark rm;
1130 RelocIterator iter(this, low_boundary);
1131 while(iter.next()) {
1132 switch(iter.type()) {
1133 case relocInfo::virtual_call_type:
1134 case relocInfo::opt_virtual_call_type: {
1135 CompiledIC *ic = CompiledIC_at(iter.reloc());
1136 // Ok, to lookup references to zombies here
1137 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
1138 if( cb != NULL && cb->is_nmethod() ) {
1139 nmethod* nm = (nmethod*)cb;
1140 // Clean inline caches pointing to both zombie and not_entrant methods
1141 if (!nm->is_in_use() || (nm->method()->code() != nm)) ic->set_to_clean();
1142 }
1143 break;
1144 }
1145 case relocInfo::static_call_type: {
1146 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
1147 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
1148 if( cb != NULL && cb->is_nmethod() ) {
1149 nmethod* nm = (nmethod*)cb;
1150 // Clean inline caches pointing to both zombie and not_entrant methods
1151 if (!nm->is_in_use() || (nm->method()->code() != nm)) csc->set_to_clean();
1152 }
1153 break;
1154 }
1155 }
1156 }
1157 }
1158
1159 // This is a private interface with the sweeper.
1160 void nmethod::mark_as_seen_on_stack() {
1161 assert(is_not_entrant(), "must be a non-entrant method");
1162 // Set the traversal mark to ensure that the sweeper does 2
1163 // cleaning passes before moving to zombie.
1164 set_stack_traversal_mark(NMethodSweeper::traversal_count());
1165 }
1166
1167 // Tell if a non-entrant method can be converted to a zombie (i.e., there is no activations on the stack)
1168 bool nmethod::can_not_entrant_be_converted() {
1169 assert(is_not_entrant(), "must be a non-entrant method");
1170
1171 // Since the nmethod sweeper only does partial sweep the sweeper's traversal
1172 // count can be greater than the stack traversal count before it hits the
1173 // nmethod for the second time.
1174 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count();
1175 }
1176
1177 void nmethod::inc_decompile_count() {
1178 if (!is_compiled_by_c2()) return;
1179 // Could be gated by ProfileTraps, but do not bother...
1180 methodOop m = method();
1181 if (m == NULL) return;
1182 methodDataOop mdo = m->method_data();
1183 if (mdo == NULL) return;
1184 // There is a benign race here. See comments in methodDataOop.hpp.
1185 mdo->inc_decompile_count();
1186 }
1187
1188 void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) {
1189
1190 post_compiled_method_unload();
1191
1192 // Since this nmethod is being unloaded, make sure that dependencies
1193 // recorded in instanceKlasses get flushed and pass non-NULL closure to
1194 // indicate that this work is being done during a GC.
1195 assert(Universe::heap()->is_gc_active(), "should only be called during gc");
1196 assert(is_alive != NULL, "Should be non-NULL");
1197 // A non-NULL is_alive closure indicates that this is being called during GC.
1198 flush_dependencies(is_alive);
1199
1200 // Break cycle between nmethod & method
1201 if (TraceClassUnloading && WizardMode) {
1202 tty->print_cr("[Class unloading: Making nmethod " INTPTR_FORMAT
1203 " unloadable], methodOop(" INTPTR_FORMAT
1204 "), cause(" INTPTR_FORMAT ")",
1205 this, (address)_method, (address)cause);
1206 if (!Universe::heap()->is_gc_active())
1207 cause->klass()->print();
1208 }
1209 // Unlink the osr method, so we do not look this up again
1210 if (is_osr_method()) {
1211 invalidate_osr_method();
1212 }
1213 // If _method is already NULL the methodOop is about to be unloaded,
1214 // so we don't have to break the cycle. Note that it is possible to
1215 // have the methodOop live here, in case we unload the nmethod because
1216 // it is pointing to some oop (other than the methodOop) being unloaded.
1217 if (_method != NULL) {
1218 // OSR methods point to the methodOop, but the methodOop does not
1219 // point back!
1220 if (_method->code() == this) {
1221 _method->clear_code(); // Break a cycle
1222 }
1223 _method = NULL; // Clear the method of this dead nmethod
1224 }
1225 // Make the class unloaded - i.e., change state and notify sweeper
1226 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
1227 if (is_in_use()) {
1228 // Transitioning directly from live to unloaded -- so
1229 // we need to force a cache clean-up; remember this
1230 // for later on.
1231 CodeCache::set_needs_cache_clean(true);
1232 }
1233 _state = unloaded;
1234
1235 // Log the unloading.
1236 log_state_change();
1237
1238 // The methodOop is gone at this point
1239 assert(_method == NULL, "Tautology");
1240
1241 set_osr_link(NULL);
1242 //set_scavenge_root_link(NULL); // done by prune_scavenge_root_nmethods
1243 NMethodSweeper::notify(this);
1244 }
1245
1246 void nmethod::invalidate_osr_method() {
1247 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
1248 // Remove from list of active nmethods
1249 if (method() != NULL)
1250 instanceKlass::cast(method()->method_holder())->remove_osr_nmethod(this);
1251 // Set entry as invalid
1252 _entry_bci = InvalidOSREntryBci;
1253 }
1254
1255 void nmethod::log_state_change() const {
1256 if (LogCompilation) {
1257 if (xtty != NULL) {
1258 ttyLocker ttyl; // keep the following output all in one block
1259 if (_state == unloaded) {
1260 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'",
1261 os::current_thread_id());
1262 } else {
1263 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s",
1264 os::current_thread_id(),
1265 (_state == zombie ? " zombie='1'" : ""));
1266 }
1267 log_identity(xtty);
1268 xtty->stamp();
1269 xtty->end_elem();
1270 }
1271 }
1272 if (PrintCompilation && _state != unloaded) {
1273 print_on(tty, _state == zombie ? "made zombie " : "made not entrant ");
1274 tty->cr();
1275 }
1276 }
1277
1278 // Common functionality for both make_not_entrant and make_zombie
1279 bool nmethod::make_not_entrant_or_zombie(unsigned int state) {
1280 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant");
1281
1282 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below.
1283 nmethodLocker nml(this);
1284 methodHandle the_method(method());
1285 No_Safepoint_Verifier nsv;
1286
1287 {
1288 // If the method is already zombie there is nothing to do
1289 if (is_zombie()) {
1290 return false;
1291 }
1292
1293 // invalidate osr nmethod before acquiring the patching lock since
1294 // they both acquire leaf locks and we don't want a deadlock.
1295 // This logic is equivalent to the logic below for patching the
1296 // verified entry point of regular methods.
1297 if (is_osr_method()) {
1298 // this effectively makes the osr nmethod not entrant
1299 invalidate_osr_method();
1300 }
1301
1302 // Enter critical section. Does not block for safepoint.
1303 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1304
1305 if (_state == state) {
1306 // another thread already performed this transition so nothing
1307 // to do, but return false to indicate this.
1308 return false;
1309 }
1310
1311 // The caller can be calling the method statically or through an inline
1312 // cache call.
1313 if (!is_osr_method() && !is_not_entrant()) {
1314 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
1315 SharedRuntime::get_handle_wrong_method_stub());
1316 }
1317
1318 if (is_in_use()) {
1319 // It's a true state change, so mark the method as decompiled.
1320 // Do it only for transition from alive.
1321 inc_decompile_count();
1322 }
1323
1324 // Change state
1325 _state = state;
1326
1327 // Log the transition once
1328 log_state_change();
1329
1330 // Remove nmethod from method.
1331 // We need to check if both the _code and _from_compiled_code_entry_point
1332 // refer to this nmethod because there is a race in setting these two fields
1333 // in methodOop as seen in bugid 4947125.
1334 // If the vep() points to the zombie nmethod, the memory for the nmethod
1335 // could be flushed and the compiler and vtable stubs could still call
1336 // through it.
1337 if (method() != NULL && (method()->code() == this ||
1338 method()->from_compiled_entry() == verified_entry_point())) {
1339 HandleMark hm;
1340 method()->clear_code();
1341 }
1342
1343 if (state == not_entrant) {
1344 mark_as_seen_on_stack();
1345 }
1346
1347 } // leave critical region under Patching_lock
1348
1349 // When the nmethod becomes zombie it is no longer alive so the
1350 // dependencies must be flushed. nmethods in the not_entrant
1351 // state will be flushed later when the transition to zombie
1352 // happens or they get unloaded.
1353 if (state == zombie) {
1354 {
1355 // Flushing dependecies must be done before any possible
1356 // safepoint can sneak in, otherwise the oops used by the
1357 // dependency logic could have become stale.
1358 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1359 flush_dependencies(NULL);
1360 }
1361
1362 {
1363 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload event
1364 // and it hasn't already been reported for this nmethod then report it now.
1365 // (the event may have been reported earilier if the GC marked it for unloading).
1366 Pause_No_Safepoint_Verifier pnsv(&nsv);
1367 post_compiled_method_unload();
1368 }
1369
1370 #ifdef ASSERT
1371 // It's no longer safe to access the oops section since zombie
1372 // nmethods aren't scanned for GC.
1373 _oops_are_stale = true;
1374 #endif
1375 } else {
1376 assert(state == not_entrant, "other cases may need to be handled differently");
1377 }
1378
1379 if (TraceCreateZombies) {
1380 tty->print_cr("nmethod <" INTPTR_FORMAT "> code made %s", this, (state == not_entrant) ? "not entrant" : "zombie");
1381 }
1382
1383 // Make sweeper aware that there is a zombie method that needs to be removed
1384 NMethodSweeper::notify(this);
1385
1386 return true;
1387 }
1388
1389 void nmethod::flush() {
1390 // Note that there are no valid oops in the nmethod anymore.
1391 assert(is_zombie() || (is_osr_method() && is_unloaded()), "must be a zombie method");
1392 assert(is_marked_for_reclamation() || (is_osr_method() && is_unloaded()), "must be marked for reclamation");
1393
1394 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed");
1395 assert_locked_or_safepoint(CodeCache_lock);
1396
1397 // completely deallocate this method
1398 EventMark m("flushing nmethod " INTPTR_FORMAT " %s", this, "");
1399 if (PrintMethodFlushing) {
1400 tty->print_cr("*flushing nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT "/Free CodeCache:" SIZE_FORMAT "Kb",
1401 _compile_id, this, CodeCache::nof_blobs(), CodeCache::unallocated_capacity()/1024);
1402 }
1403
1404 // We need to deallocate any ExceptionCache data.
1405 // Note that we do not need to grab the nmethod lock for this, it
1406 // better be thread safe if we're disposing of it!
1407 ExceptionCache* ec = exception_cache();
1408 set_exception_cache(NULL);
1409 while(ec != NULL) {
1410 ExceptionCache* next = ec->next();
1411 delete ec;
1412 ec = next;
1413 }
1414
1415 if (on_scavenge_root_list()) {
1416 CodeCache::drop_scavenge_root_nmethod(this);
1417 }
1418
1419 if (is_speculatively_disconnected()) {
1420 CodeCache::remove_saved_code(this);
1421 }
1422
1423 #ifdef SHARK
1424 ((SharkCompiler *) compiler())->free_compiled_method(insts_begin());
1425 #endif // SHARK
1426
1427 ((CodeBlob*)(this))->flush();
1428
1429 CodeCache::free(this);
1430 }
1431
1432
1433 //
1434 // Notify all classes this nmethod is dependent on that it is no
1435 // longer dependent. This should only be called in two situations.
1436 // First, when a nmethod transitions to a zombie all dependents need
1437 // to be clear. Since zombification happens at a safepoint there's no
1438 // synchronization issues. The second place is a little more tricky.
1439 // During phase 1 of mark sweep class unloading may happen and as a
1440 // result some nmethods may get unloaded. In this case the flushing
1441 // of dependencies must happen during phase 1 since after GC any
1442 // dependencies in the unloaded nmethod won't be updated, so
1443 // traversing the dependency information in unsafe. In that case this
1444 // function is called with a non-NULL argument and this function only
1445 // notifies instanceKlasses that are reachable
1446
1447 void nmethod::flush_dependencies(BoolObjectClosure* is_alive) {
1448 assert_locked_or_safepoint(CodeCache_lock);
1449 assert(Universe::heap()->is_gc_active() == (is_alive != NULL),
1450 "is_alive is non-NULL if and only if we are called during GC");
1451 if (!has_flushed_dependencies()) {
1452 set_has_flushed_dependencies();
1453 for (Dependencies::DepStream deps(this); deps.next(); ) {
1454 klassOop klass = deps.context_type();
1455 if (klass == NULL) continue; // ignore things like evol_method
1456
1457 // During GC the is_alive closure is non-NULL, and is used to
1458 // determine liveness of dependees that need to be updated.
1459 if (is_alive == NULL || is_alive->do_object_b(klass)) {
1460 instanceKlass::cast(klass)->remove_dependent_nmethod(this);
1461 }
1462 }
1463 }
1464 }
1465
1466
1467 // If this oop is not live, the nmethod can be unloaded.
1468 bool nmethod::can_unload(BoolObjectClosure* is_alive,
1469 OopClosure* keep_alive,
1470 oop* root, bool unloading_occurred) {
1471 assert(root != NULL, "just checking");
1472 oop obj = *root;
1473 if (obj == NULL || is_alive->do_object_b(obj)) {
1474 return false;
1475 }
1476 if (obj->is_compiledICHolder()) {
1477 compiledICHolderOop cichk_oop = compiledICHolderOop(obj);
1478 if (is_alive->do_object_b(
1479 cichk_oop->holder_method()->method_holder()) &&
1480 is_alive->do_object_b(cichk_oop->holder_klass())) {
1481 // The oop should be kept alive
1482 keep_alive->do_oop(root);
1483 return false;
1484 }
1485 }
1486 // If ScavengeRootsInCode is true, an nmethod might be unloaded
1487 // simply because one of its constant oops has gone dead.
1488 // No actual classes need to be unloaded in order for this to occur.
1489 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading");
1490 make_unloaded(is_alive, obj);
1491 return true;
1492 }
1493
1494 // ------------------------------------------------------------------
1495 // post_compiled_method_load_event
1496 // new method for install_code() path
1497 // Transfer information from compilation to jvmti
1498 void nmethod::post_compiled_method_load_event() {
1499
1500 methodOop moop = method();
1501 HS_DTRACE_PROBE8(hotspot, compiled__method__load,
1502 moop->klass_name()->bytes(),
1503 moop->klass_name()->utf8_length(),
1504 moop->name()->bytes(),
1505 moop->name()->utf8_length(),
1506 moop->signature()->bytes(),
1507 moop->signature()->utf8_length(),
1508 insts_begin(), insts_size());
1509
1510 if (JvmtiExport::should_post_compiled_method_load() ||
1511 JvmtiExport::should_post_compiled_method_unload()) {
1512 get_and_cache_jmethod_id();
1513 }
1514
1515 if (JvmtiExport::should_post_compiled_method_load()) {
1516 JvmtiExport::post_compiled_method_load(this);
1517 }
1518 }
1519
1520 jmethodID nmethod::get_and_cache_jmethod_id() {
1521 if (_jmethod_id == NULL) {
1522 // Cache the jmethod_id since it can no longer be looked up once the
1523 // method itself has been marked for unloading.
1524 _jmethod_id = method()->jmethod_id();
1525 }
1526 return _jmethod_id;
1527 }
1528
1529 void nmethod::post_compiled_method_unload() {
1530 if (unload_reported()) {
1531 // During unloading we transition to unloaded and then to zombie
1532 // and the unloading is reported during the first transition.
1533 return;
1534 }
1535
1536 assert(_method != NULL && !is_unloaded(), "just checking");
1537 DTRACE_METHOD_UNLOAD_PROBE(method());
1538
1539 // If a JVMTI agent has enabled the CompiledMethodUnload event then
1540 // post the event. Sometime later this nmethod will be made a zombie
1541 // by the sweeper but the methodOop will not be valid at that point.
1542 // If the _jmethod_id is null then no load event was ever requested
1543 // so don't bother posting the unload. The main reason for this is
1544 // that the jmethodID is a weak reference to the methodOop so if
1545 // it's being unloaded there's no way to look it up since the weak
1546 // ref will have been cleared.
1547 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) {
1548 assert(!unload_reported(), "already unloaded");
1549 HandleMark hm;
1550 JvmtiExport::post_compiled_method_unload(_jmethod_id, insts_begin());
1551 }
1552
1553 // The JVMTI CompiledMethodUnload event can be enabled or disabled at
1554 // any time. As the nmethod is being unloaded now we mark it has
1555 // having the unload event reported - this will ensure that we don't
1556 // attempt to report the event in the unlikely scenario where the
1557 // event is enabled at the time the nmethod is made a zombie.
1558 set_unload_reported();
1559 }
1560
1561 // This is called at the end of the strong tracing/marking phase of a
1562 // GC to unload an nmethod if it contains otherwise unreachable
1563 // oops.
1564
1565 void nmethod::do_unloading(BoolObjectClosure* is_alive,
1566 OopClosure* keep_alive, bool unloading_occurred) {
1567 // Make sure the oop's ready to receive visitors
1568 assert(!is_zombie() && !is_unloaded(),
1569 "should not call follow on zombie or unloaded nmethod");
1570
1571 // If the method is not entrant then a JMP is plastered over the
1572 // first few bytes. If an oop in the old code was there, that oop
1573 // should not get GC'd. Skip the first few bytes of oops on
1574 // not-entrant methods.
1575 address low_boundary = verified_entry_point();
1576 if (is_not_entrant()) {
1577 low_boundary += NativeJump::instruction_size;
1578 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1579 // (See comment above.)
1580 }
1581
1582 // The RedefineClasses() API can cause the class unloading invariant
1583 // to no longer be true. See jvmtiExport.hpp for details.
1584 // Also, leave a debugging breadcrumb in local flag.
1585 bool a_class_was_redefined = JvmtiExport::has_redefined_a_class();
1586 if (a_class_was_redefined) {
1587 // This set of the unloading_occurred flag is done before the
1588 // call to post_compiled_method_unload() so that the unloading
1589 // of this nmethod is reported.
1590 unloading_occurred = true;
1591 }
1592
1593 // Follow methodOop
1594 if (can_unload(is_alive, keep_alive, (oop*)&_method, unloading_occurred)) {
1595 return;
1596 }
1597
1598 // Exception cache
1599 ExceptionCache* ec = exception_cache();
1600 while (ec != NULL) {
1601 oop* ex_addr = (oop*)ec->exception_type_addr();
1602 oop ex = *ex_addr;
1603 ExceptionCache* next_ec = ec->next();
1604 if (ex != NULL && !is_alive->do_object_b(ex)) {
1605 assert(!ex->is_compiledICHolder(), "Possible error here");
1606 remove_from_exception_cache(ec);
1607 }
1608 ec = next_ec;
1609 }
1610
1611 // If class unloading occurred we first iterate over all inline caches and
1612 // clear ICs where the cached oop is referring to an unloaded klass or method.
1613 // The remaining live cached oops will be traversed in the relocInfo::oop_type
1614 // iteration below.
1615 if (unloading_occurred) {
1616 RelocIterator iter(this, low_boundary);
1617 while(iter.next()) {
1618 if (iter.type() == relocInfo::virtual_call_type) {
1619 CompiledIC *ic = CompiledIC_at(iter.reloc());
1620 oop ic_oop = ic->cached_oop();
1621 if (ic_oop != NULL && !is_alive->do_object_b(ic_oop)) {
1622 // The only exception is compiledICHolder oops which may
1623 // yet be marked below. (We check this further below).
1624 if (ic_oop->is_compiledICHolder()) {
1625 compiledICHolderOop cichk_oop = compiledICHolderOop(ic_oop);
1626 if (is_alive->do_object_b(
1627 cichk_oop->holder_method()->method_holder()) &&
1628 is_alive->do_object_b(cichk_oop->holder_klass())) {
1629 continue;
1630 }
1631 }
1632 ic->set_to_clean();
1633 assert(ic->cached_oop() == NULL,
1634 "cached oop in IC should be cleared");
1635 }
1636 }
1637 }
1638 }
1639
1640 // Compiled code
1641 RelocIterator iter(this, low_boundary);
1642 while (iter.next()) {
1643 if (iter.type() == relocInfo::oop_type) {
1644 oop_Relocation* r = iter.oop_reloc();
1645 // In this loop, we must only traverse those oops directly embedded in
1646 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1647 assert(1 == (r->oop_is_immediate()) +
1648 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1649 "oop must be found in exactly one place");
1650 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1651 if (can_unload(is_alive, keep_alive, r->oop_addr(), unloading_occurred)) {
1652 return;
1653 }
1654 }
1655 }
1656 }
1657
1658
1659 // Scopes
1660 for (oop* p = oops_begin(); p < oops_end(); p++) {
1661 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1662 if (can_unload(is_alive, keep_alive, p, unloading_occurred)) {
1663 return;
1664 }
1665 }
1666
1667 #ifndef PRODUCT
1668 // This nmethod was not unloaded; check below that all CompiledICs
1669 // refer to marked oops.
1670 {
1671 RelocIterator iter(this, low_boundary);
1672 while (iter.next()) {
1673 if (iter.type() == relocInfo::virtual_call_type) {
1674 CompiledIC *ic = CompiledIC_at(iter.reloc());
1675 oop ic_oop = ic->cached_oop();
1676 assert(ic_oop == NULL || is_alive->do_object_b(ic_oop),
1677 "Found unmarked ic_oop in reachable nmethod");
1678 }
1679 }
1680 }
1681 #endif // !PRODUCT
1682 }
1683
1684 // This method is called twice during GC -- once while
1685 // tracing the "active" nmethods on thread stacks during
1686 // the (strong) marking phase, and then again when walking
1687 // the code cache contents during the weak roots processing
1688 // phase. The two uses are distinguished by means of the
1689 // 'do_strong_roots_only' flag, which is true in the first
1690 // case. We want to walk the weak roots in the nmethod
1691 // only in the second case. The weak roots in the nmethod
1692 // are the oops in the ExceptionCache and the InlineCache
1693 // oops.
1694 void nmethod::oops_do(OopClosure* f, bool do_strong_roots_only) {
1695 // make sure the oops ready to receive visitors
1696 assert(!is_zombie() && !is_unloaded(),
1697 "should not call follow on zombie or unloaded nmethod");
1698
1699 // If the method is not entrant or zombie then a JMP is plastered over the
1700 // first few bytes. If an oop in the old code was there, that oop
1701 // should not get GC'd. Skip the first few bytes of oops on
1702 // not-entrant methods.
1703 address low_boundary = verified_entry_point();
1704 if (is_not_entrant()) {
1705 low_boundary += NativeJump::instruction_size;
1706 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1707 // (See comment above.)
1708 }
1709
1710 // Compiled code
1711 f->do_oop((oop*) &_method);
1712 if (!do_strong_roots_only) {
1713 // weak roots processing phase -- update ExceptionCache oops
1714 ExceptionCache* ec = exception_cache();
1715 while(ec != NULL) {
1716 f->do_oop((oop*)ec->exception_type_addr());
1717 ec = ec->next();
1718 }
1719 } // Else strong roots phase -- skip oops in ExceptionCache
1720
1721 RelocIterator iter(this, low_boundary);
1722
1723 while (iter.next()) {
1724 if (iter.type() == relocInfo::oop_type ) {
1725 oop_Relocation* r = iter.oop_reloc();
1726 // In this loop, we must only follow those oops directly embedded in
1727 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1728 assert(1 == (r->oop_is_immediate()) +
1729 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1730 "oop must be found in exactly one place");
1731 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1732 f->do_oop(r->oop_addr());
1733 }
1734 }
1735 }
1736
1737 // Scopes
1738 // This includes oop constants not inlined in the code stream.
1739 for (oop* p = oops_begin(); p < oops_end(); p++) {
1740 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1741 f->do_oop(p);
1742 }
1743 }
1744
1745 #define NMETHOD_SENTINEL ((nmethod*)badAddress)
1746
1747 nmethod* volatile nmethod::_oops_do_mark_nmethods;
1748
1749 // An nmethod is "marked" if its _mark_link is set non-null.
1750 // Even if it is the end of the linked list, it will have a non-null link value,
1751 // as long as it is on the list.
1752 // This code must be MP safe, because it is used from parallel GC passes.
1753 bool nmethod::test_set_oops_do_mark() {
1754 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");
1755 nmethod* observed_mark_link = _oops_do_mark_link;
1756 if (observed_mark_link == NULL) {
1757 // Claim this nmethod for this thread to mark.
1758 observed_mark_link = (nmethod*)
1759 Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_link, NULL);
1760 if (observed_mark_link == NULL) {
1761
1762 // Atomically append this nmethod (now claimed) to the head of the list:
1763 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods;
1764 for (;;) {
1765 nmethod* required_mark_nmethods = observed_mark_nmethods;
1766 _oops_do_mark_link = required_mark_nmethods;
1767 observed_mark_nmethods = (nmethod*)
1768 Atomic::cmpxchg_ptr(this, &_oops_do_mark_nmethods, required_mark_nmethods);
1769 if (observed_mark_nmethods == required_mark_nmethods)
1770 break;
1771 }
1772 // Mark was clear when we first saw this guy.
1773 NOT_PRODUCT(if (TraceScavenge) print_on(tty, "oops_do, mark\n"));
1774 return false;
1775 }
1776 }
1777 // On fall through, another racing thread marked this nmethod before we did.
1778 return true;
1779 }
1780
1781 void nmethod::oops_do_marking_prologue() {
1782 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("[oops_do_marking_prologue"));
1783 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row");
1784 // We use cmpxchg_ptr instead of regular assignment here because the user
1785 // may fork a bunch of threads, and we need them all to see the same state.
1786 void* observed = Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, NULL);
1787 guarantee(observed == NULL, "no races in this sequential code");
1788 }
1789
1790 void nmethod::oops_do_marking_epilogue() {
1791 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row");
1792 nmethod* cur = _oops_do_mark_nmethods;
1793 while (cur != NMETHOD_SENTINEL) {
1794 assert(cur != NULL, "not NULL-terminated");
1795 nmethod* next = cur->_oops_do_mark_link;
1796 cur->_oops_do_mark_link = NULL;
1797 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark\n"));
1798 cur = next;
1799 }
1800 void* required = _oops_do_mark_nmethods;
1801 void* observed = Atomic::cmpxchg_ptr(NULL, &_oops_do_mark_nmethods, required);
1802 guarantee(observed == required, "no races in this sequential code");
1803 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("oops_do_marking_epilogue]"));
1804 }
1805
1806 class DetectScavengeRoot: public OopClosure {
1807 bool _detected_scavenge_root;
1808 public:
1809 DetectScavengeRoot() : _detected_scavenge_root(false)
1810 { NOT_PRODUCT(_print_nm = NULL); }
1811 bool detected_scavenge_root() { return _detected_scavenge_root; }
1812 virtual void do_oop(oop* p) {
1813 if ((*p) != NULL && (*p)->is_scavengable()) {
1814 NOT_PRODUCT(maybe_print(p));
1815 _detected_scavenge_root = true;
1816 }
1817 }
1818 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
1819
1820 #ifndef PRODUCT
1821 nmethod* _print_nm;
1822 void maybe_print(oop* p) {
1823 if (_print_nm == NULL) return;
1824 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root");
1825 tty->print_cr(""PTR_FORMAT"[offset=%d] detected non-perm oop "PTR_FORMAT" (found at "PTR_FORMAT")",
1826 _print_nm, (int)((intptr_t)p - (intptr_t)_print_nm),
1827 (intptr_t)(*p), (intptr_t)p);
1828 (*p)->print();
1829 }
1830 #endif //PRODUCT
1831 };
1832
1833 bool nmethod::detect_scavenge_root_oops() {
1834 DetectScavengeRoot detect_scavenge_root;
1835 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this);
1836 oops_do(&detect_scavenge_root);
1837 return detect_scavenge_root.detected_scavenge_root();
1838 }
1839
1840 // Method that knows how to preserve outgoing arguments at call. This method must be
1841 // called with a frame corresponding to a Java invoke
1842 void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) {
1843 #ifndef SHARK
1844 if (!method()->is_native()) {
1845 SimpleScopeDesc ssd(this, fr.pc());
1846 Bytecode_invoke* call = Bytecode_invoke_at(ssd.method(), ssd.bci());
1847 bool has_receiver = call->has_receiver();
1848 symbolOop signature = call->signature();
1849 fr.oops_compiled_arguments_do(signature, has_receiver, reg_map, f);
1850 }
1851 #endif // !SHARK
1852 }
1853
1854
1855 oop nmethod::embeddedOop_at(u_char* p) {
1856 RelocIterator iter(this, p, p + oopSize);
1857 while (iter.next())
1858 if (iter.type() == relocInfo::oop_type) {
1859 return iter.oop_reloc()->oop_value();
1860 }
1861 return NULL;
1862 }
1863
1864
1865 inline bool includes(void* p, void* from, void* to) {
1866 return from <= p && p < to;
1867 }
1868
1869
1870 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
1871 assert(count >= 2, "must be sentinel values, at least");
1872
1873 #ifdef ASSERT
1874 // must be sorted and unique; we do a binary search in find_pc_desc()
1875 int prev_offset = pcs[0].pc_offset();
1876 assert(prev_offset == PcDesc::lower_offset_limit,
1877 "must start with a sentinel");
1878 for (int i = 1; i < count; i++) {
1879 int this_offset = pcs[i].pc_offset();
1880 assert(this_offset > prev_offset, "offsets must be sorted");
1881 prev_offset = this_offset;
1882 }
1883 assert(prev_offset == PcDesc::upper_offset_limit,
1884 "must end with a sentinel");
1885 #endif //ASSERT
1886
1887 // Search for MethodHandle invokes and tag the nmethod.
1888 for (int i = 0; i < count; i++) {
1889 if (pcs[i].is_method_handle_invoke()) {
1890 set_has_method_handle_invokes(true);
1891 break;
1892 }
1893 }
1894
1895 int size = count * sizeof(PcDesc);
1896 assert(scopes_pcs_size() >= size, "oob");
1897 memcpy(scopes_pcs_begin(), pcs, size);
1898
1899 // Adjust the final sentinel downward.
1900 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
1901 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
1902 last_pc->set_pc_offset(content_size() + 1);
1903 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
1904 // Fill any rounding gaps with copies of the last record.
1905 last_pc[1] = last_pc[0];
1906 }
1907 // The following assert could fail if sizeof(PcDesc) is not
1908 // an integral multiple of oopSize (the rounding term).
1909 // If it fails, change the logic to always allocate a multiple
1910 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
1911 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
1912 }
1913
1914 void nmethod::copy_scopes_data(u_char* buffer, int size) {
1915 assert(scopes_data_size() >= size, "oob");
1916 memcpy(scopes_data_begin(), buffer, size);
1917 }
1918
1919
1920 #ifdef ASSERT
1921 static PcDesc* linear_search(nmethod* nm, int pc_offset, bool approximate) {
1922 PcDesc* lower = nm->scopes_pcs_begin();
1923 PcDesc* upper = nm->scopes_pcs_end();
1924 lower += 1; // exclude initial sentinel
1925 PcDesc* res = NULL;
1926 for (PcDesc* p = lower; p < upper; p++) {
1927 NOT_PRODUCT(--nmethod_stats.pc_desc_tests); // don't count this call to match_desc
1928 if (match_desc(p, pc_offset, approximate)) {
1929 if (res == NULL)
1930 res = p;
1931 else
1932 res = (PcDesc*) badAddress;
1933 }
1934 }
1935 return res;
1936 }
1937 #endif
1938
1939
1940 // Finds a PcDesc with real-pc equal to "pc"
1941 PcDesc* nmethod::find_pc_desc_internal(address pc, bool approximate) {
1942 address base_address = code_begin();
1943 if ((pc < base_address) ||
1944 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
1945 return NULL; // PC is wildly out of range
1946 }
1947 int pc_offset = (int) (pc - base_address);
1948
1949 // Check the PcDesc cache if it contains the desired PcDesc
1950 // (This as an almost 100% hit rate.)
1951 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
1952 if (res != NULL) {
1953 assert(res == linear_search(this, pc_offset, approximate), "cache ok");
1954 return res;
1955 }
1956
1957 // Fallback algorithm: quasi-linear search for the PcDesc
1958 // Find the last pc_offset less than the given offset.
1959 // The successor must be the required match, if there is a match at all.
1960 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
1961 PcDesc* lower = scopes_pcs_begin();
1962 PcDesc* upper = scopes_pcs_end();
1963 upper -= 1; // exclude final sentinel
1964 if (lower >= upper) return NULL; // native method; no PcDescs at all
1965
1966 #define assert_LU_OK \
1967 /* invariant on lower..upper during the following search: */ \
1968 assert(lower->pc_offset() < pc_offset, "sanity"); \
1969 assert(upper->pc_offset() >= pc_offset, "sanity")
1970 assert_LU_OK;
1971
1972 // Use the last successful return as a split point.
1973 PcDesc* mid = _pc_desc_cache.last_pc_desc();
1974 NOT_PRODUCT(++nmethod_stats.pc_desc_searches);
1975 if (mid->pc_offset() < pc_offset) {
1976 lower = mid;
1977 } else {
1978 upper = mid;
1979 }
1980
1981 // Take giant steps at first (4096, then 256, then 16, then 1)
1982 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
1983 const int RADIX = (1 << LOG2_RADIX);
1984 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
1985 while ((mid = lower + step) < upper) {
1986 assert_LU_OK;
1987 NOT_PRODUCT(++nmethod_stats.pc_desc_searches);
1988 if (mid->pc_offset() < pc_offset) {
1989 lower = mid;
1990 } else {
1991 upper = mid;
1992 break;
1993 }
1994 }
1995 assert_LU_OK;
1996 }
1997
1998 // Sneak up on the value with a linear search of length ~16.
1999 while (true) {
2000 assert_LU_OK;
2001 mid = lower + 1;
2002 NOT_PRODUCT(++nmethod_stats.pc_desc_searches);
2003 if (mid->pc_offset() < pc_offset) {
2004 lower = mid;
2005 } else {
2006 upper = mid;
2007 break;
2008 }
2009 }
2010 #undef assert_LU_OK
2011
2012 if (match_desc(upper, pc_offset, approximate)) {
2013 assert(upper == linear_search(this, pc_offset, approximate), "search ok");
2014 _pc_desc_cache.add_pc_desc(upper);
2015 return upper;
2016 } else {
2017 assert(NULL == linear_search(this, pc_offset, approximate), "search ok");
2018 return NULL;
2019 }
2020 }
2021
2022
2023 bool nmethod::check_all_dependencies() {
2024 bool found_check = false;
2025 // wholesale check of all dependencies
2026 for (Dependencies::DepStream deps(this); deps.next(); ) {
2027 if (deps.check_dependency() != NULL) {
2028 found_check = true;
2029 NOT_DEBUG(break);
2030 }
2031 }
2032 return found_check; // tell caller if we found anything
2033 }
2034
2035 bool nmethod::check_dependency_on(DepChange& changes) {
2036 // What has happened:
2037 // 1) a new class dependee has been added
2038 // 2) dependee and all its super classes have been marked
2039 bool found_check = false; // set true if we are upset
2040 for (Dependencies::DepStream deps(this); deps.next(); ) {
2041 // Evaluate only relevant dependencies.
2042 if (deps.spot_check_dependency_at(changes) != NULL) {
2043 found_check = true;
2044 NOT_DEBUG(break);
2045 }
2046 }
2047 return found_check;
2048 }
2049
2050 bool nmethod::is_evol_dependent_on(klassOop dependee) {
2051 instanceKlass *dependee_ik = instanceKlass::cast(dependee);
2052 objArrayOop dependee_methods = dependee_ik->methods();
2053 for (Dependencies::DepStream deps(this); deps.next(); ) {
2054 if (deps.type() == Dependencies::evol_method) {
2055 methodOop method = deps.method_argument(0);
2056 for (int j = 0; j < dependee_methods->length(); j++) {
2057 if ((methodOop) dependee_methods->obj_at(j) == method) {
2058 // RC_TRACE macro has an embedded ResourceMark
2059 RC_TRACE(0x01000000,
2060 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)",
2061 _method->method_holder()->klass_part()->external_name(),
2062 _method->name()->as_C_string(),
2063 _method->signature()->as_C_string(), compile_id(),
2064 method->method_holder()->klass_part()->external_name(),
2065 method->name()->as_C_string(),
2066 method->signature()->as_C_string()));
2067 if (TraceDependencies || LogCompilation)
2068 deps.log_dependency(dependee);
2069 return true;
2070 }
2071 }
2072 }
2073 }
2074 return false;
2075 }
2076
2077 // Called from mark_for_deoptimization, when dependee is invalidated.
2078 bool nmethod::is_dependent_on_method(methodOop dependee) {
2079 for (Dependencies::DepStream deps(this); deps.next(); ) {
2080 if (deps.type() != Dependencies::evol_method)
2081 continue;
2082 methodOop method = deps.method_argument(0);
2083 if (method == dependee) return true;
2084 }
2085 return false;
2086 }
2087
2088
2089 bool nmethod::is_patchable_at(address instr_addr) {
2090 assert(insts_contains(instr_addr), "wrong nmethod used");
2091 if (is_zombie()) {
2092 // a zombie may never be patched
2093 return false;
2094 }
2095 return true;
2096 }
2097
2098
2099 address nmethod::continuation_for_implicit_exception(address pc) {
2100 // Exception happened outside inline-cache check code => we are inside
2101 // an active nmethod => use cpc to determine a return address
2102 int exception_offset = pc - code_begin();
2103 int cont_offset = ImplicitExceptionTable(this).at( exception_offset );
2104 #ifdef ASSERT
2105 if (cont_offset == 0) {
2106 Thread* thread = ThreadLocalStorage::get_thread_slow();
2107 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
2108 HandleMark hm(thread);
2109 ResourceMark rm(thread);
2110 CodeBlob* cb = CodeCache::find_blob(pc);
2111 assert(cb != NULL && cb == this, "");
2112 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, pc);
2113 print();
2114 method()->print_codes();
2115 print_code();
2116 print_pcs();
2117 }
2118 #endif
2119 if (cont_offset == 0) {
2120 // Let the normal error handling report the exception
2121 return NULL;
2122 }
2123 return code_begin() + cont_offset;
2124 }
2125
2126
2127
2128 void nmethod_init() {
2129 // make sure you didn't forget to adjust the filler fields
2130 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
2131 }
2132
2133
2134 //-------------------------------------------------------------------------------------------
2135
2136
2137 // QQQ might we make this work from a frame??
2138 nmethodLocker::nmethodLocker(address pc) {
2139 CodeBlob* cb = CodeCache::find_blob(pc);
2140 guarantee(cb != NULL && cb->is_nmethod(), "bad pc for a nmethod found");
2141 _nm = (nmethod*)cb;
2142 lock_nmethod(_nm);
2143 }
2144
2145 void nmethodLocker::lock_nmethod(nmethod* nm) {
2146 if (nm == NULL) return;
2147 Atomic::inc(&nm->_lock_count);
2148 guarantee(!nm->is_zombie(), "cannot lock a zombie method");
2149 }
2150
2151 void nmethodLocker::unlock_nmethod(nmethod* nm) {
2152 if (nm == NULL) return;
2153 Atomic::dec(&nm->_lock_count);
2154 guarantee(nm->_lock_count >= 0, "unmatched nmethod lock/unlock");
2155 }
2156
2157
2158 // -----------------------------------------------------------------------------
2159 // nmethod::get_deopt_original_pc
2160 //
2161 // Return the original PC for the given PC if:
2162 // (a) the given PC belongs to a nmethod and
2163 // (b) it is a deopt PC
2164 address nmethod::get_deopt_original_pc(const frame* fr) {
2165 if (fr->cb() == NULL) return NULL;
2166
2167 nmethod* nm = fr->cb()->as_nmethod_or_null();
2168 if (nm != NULL && nm->is_deopt_pc(fr->pc()))
2169 return nm->get_original_pc(fr);
2170
2171 return NULL;
2172 }
2173
2174
2175 // -----------------------------------------------------------------------------
2176 // MethodHandle
2177
2178 bool nmethod::is_method_handle_return(address return_pc) {
2179 if (!has_method_handle_invokes()) return false;
2180 PcDesc* pd = pc_desc_at(return_pc);
2181 if (pd == NULL)
2182 return false;
2183 return pd->is_method_handle_invoke();
2184 }
2185
2186
2187 // -----------------------------------------------------------------------------
2188 // Verification
2189
2190 class VerifyOopsClosure: public OopClosure {
2191 nmethod* _nm;
2192 bool _ok;
2193 public:
2194 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
2195 bool ok() { return _ok; }
2196 virtual void do_oop(oop* p) {
2197 if ((*p) == NULL || (*p)->is_oop()) return;
2198 if (_ok) {
2199 _nm->print_nmethod(true);
2200 _ok = false;
2201 }
2202 tty->print_cr("*** non-oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)",
2203 (intptr_t)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm));
2204 }
2205 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2206 };
2207
2208 void nmethod::verify() {
2209
2210 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant
2211 // seems odd.
2212
2213 if( is_zombie() || is_not_entrant() )
2214 return;
2215
2216 // Make sure all the entry points are correctly aligned for patching.
2217 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
2218
2219 assert(method()->is_oop(), "must be valid");
2220
2221 ResourceMark rm;
2222
2223 if (!CodeCache::contains(this)) {
2224 fatal(err_msg("nmethod at " INTPTR_FORMAT " not in zone", this));
2225 }
2226
2227 if(is_native_method() )
2228 return;
2229
2230 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
2231 if (nm != this) {
2232 fatal(err_msg("findNMethod did not find this nmethod (" INTPTR_FORMAT ")",
2233 this));
2234 }
2235
2236 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2237 if (! p->verify(this)) {
2238 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", this);
2239 }
2240 }
2241
2242 VerifyOopsClosure voc(this);
2243 oops_do(&voc);
2244 assert(voc.ok(), "embedded oops must be OK");
2245 verify_scavenge_root_oops();
2246
2247 verify_scopes();
2248 }
2249
2250
2251 void nmethod::verify_interrupt_point(address call_site) {
2252 // This code does not work in release mode since
2253 // owns_lock only is available in debug mode.
2254 CompiledIC* ic = NULL;
2255 Thread *cur = Thread::current();
2256 if (CompiledIC_lock->owner() == cur ||
2257 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) &&
2258 SafepointSynchronize::is_at_safepoint())) {
2259 ic = CompiledIC_at(call_site);
2260 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
2261 } else {
2262 MutexLocker ml_verify (CompiledIC_lock);
2263 ic = CompiledIC_at(call_site);
2264 }
2265 PcDesc* pd = pc_desc_at(ic->end_of_call());
2266 assert(pd != NULL, "PcDesc must exist");
2267 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(),
2268 pd->obj_decode_offset(), pd->should_reexecute(),
2269 pd->return_oop());
2270 !sd->is_top(); sd = sd->sender()) {
2271 sd->verify();
2272 }
2273 }
2274
2275 void nmethod::verify_scopes() {
2276 if( !method() ) return; // Runtime stubs have no scope
2277 if (method()->is_native()) return; // Ignore stub methods.
2278 // iterate through all interrupt point
2279 // and verify the debug information is valid.
2280 RelocIterator iter((nmethod*)this);
2281 while (iter.next()) {
2282 address stub = NULL;
2283 switch (iter.type()) {
2284 case relocInfo::virtual_call_type:
2285 verify_interrupt_point(iter.addr());
2286 break;
2287 case relocInfo::opt_virtual_call_type:
2288 stub = iter.opt_virtual_call_reloc()->static_stub();
2289 verify_interrupt_point(iter.addr());
2290 break;
2291 case relocInfo::static_call_type:
2292 stub = iter.static_call_reloc()->static_stub();
2293 //verify_interrupt_point(iter.addr());
2294 break;
2295 case relocInfo::runtime_call_type:
2296 address destination = iter.reloc()->value();
2297 // Right now there is no way to find out which entries support
2298 // an interrupt point. It would be nice if we had this
2299 // information in a table.
2300 break;
2301 }
2302 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section");
2303 }
2304 }
2305
2306
2307 // -----------------------------------------------------------------------------
2308 // Non-product code
2309 #ifndef PRODUCT
2310
2311 class DebugScavengeRoot: public OopClosure {
2312 nmethod* _nm;
2313 bool _ok;
2314 public:
2315 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { }
2316 bool ok() { return _ok; }
2317 virtual void do_oop(oop* p) {
2318 if ((*p) == NULL || !(*p)->is_scavengable()) return;
2319 if (_ok) {
2320 _nm->print_nmethod(true);
2321 _ok = false;
2322 }
2323 tty->print_cr("*** non-perm oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)",
2324 (intptr_t)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm));
2325 (*p)->print();
2326 }
2327 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2328 };
2329
2330 void nmethod::verify_scavenge_root_oops() {
2331 if (!on_scavenge_root_list()) {
2332 // Actually look inside, to verify the claim that it's clean.
2333 DebugScavengeRoot debug_scavenge_root(this);
2334 oops_do(&debug_scavenge_root);
2335 if (!debug_scavenge_root.ok())
2336 fatal("found an unadvertised bad non-perm oop in the code cache");
2337 }
2338 assert(scavenge_root_not_marked(), "");
2339 }
2340
2341 #endif // PRODUCT
2342
2343 // Printing operations
2344
2345 void nmethod::print() const {
2346 ResourceMark rm;
2347 ttyLocker ttyl; // keep the following output all in one block
2348
2349 tty->print("Compiled ");
2350
2351 if (is_compiled_by_c1()) {
2352 tty->print("(c1) ");
2353 } else if (is_compiled_by_c2()) {
2354 tty->print("(c2) ");
2355 } else if (is_compiled_by_shark()) {
2356 tty->print("(shark) ");
2357 } else {
2358 tty->print("(nm) ");
2359 }
2360
2361 print_on(tty, "nmethod");
2362 tty->cr();
2363 if (WizardMode) {
2364 tty->print("((nmethod*) "INTPTR_FORMAT ") ", this);
2365 tty->print(" for method " INTPTR_FORMAT , (address)method());
2366 tty->print(" { ");
2367 if (is_in_use()) tty->print("in_use ");
2368 if (is_not_entrant()) tty->print("not_entrant ");
2369 if (is_zombie()) tty->print("zombie ");
2370 if (is_unloaded()) tty->print("unloaded ");
2371 if (on_scavenge_root_list()) tty->print("scavenge_root ");
2372 tty->print_cr("}:");
2373 }
2374 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2375 (address)this,
2376 (address)this + size(),
2377 size());
2378 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2379 relocation_begin(),
2380 relocation_end(),
2381 relocation_size());
2382 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2383 consts_begin(),
2384 consts_end(),
2385 consts_size());
2386 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2387 insts_begin(),
2388 insts_end(),
2389 insts_size());
2390 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2391 stub_begin(),
2392 stub_end(),
2393 stub_size());
2394 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2395 oops_begin(),
2396 oops_end(),
2397 oops_size());
2398 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2399 scopes_data_begin(),
2400 scopes_data_end(),
2401 scopes_data_size());
2402 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2403 scopes_pcs_begin(),
2404 scopes_pcs_end(),
2405 scopes_pcs_size());
2406 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2407 dependencies_begin(),
2408 dependencies_end(),
2409 dependencies_size());
2410 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2411 handler_table_begin(),
2412 handler_table_end(),
2413 handler_table_size());
2414 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2415 nul_chk_table_begin(),
2416 nul_chk_table_end(),
2417 nul_chk_table_size());
2418 }
2419
2420 void nmethod::print_code() {
2421 HandleMark hm;
2422 ResourceMark m;
2423 Disassembler::decode(this);
2424 }
2425
2426
2427 #ifndef PRODUCT
2428
2429 void nmethod::print_scopes() {
2430 // Find the first pc desc for all scopes in the code and print it.
2431 ResourceMark rm;
2432 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2433 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
2434 continue;
2435
2436 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
2437 sd->print_on(tty, p);
2438 }
2439 }
2440
2441 void nmethod::print_dependencies() {
2442 ResourceMark rm;
2443 ttyLocker ttyl; // keep the following output all in one block
2444 tty->print_cr("Dependencies:");
2445 for (Dependencies::DepStream deps(this); deps.next(); ) {
2446 deps.print_dependency();
2447 klassOop ctxk = deps.context_type();
2448 if (ctxk != NULL) {
2449 Klass* k = Klass::cast(ctxk);
2450 if (k->oop_is_instance() && ((instanceKlass*)k)->is_dependent_nmethod(this)) {
2451 tty->print_cr(" [nmethod<=klass]%s", k->external_name());
2452 }
2453 }
2454 deps.log_dependency(); // put it into the xml log also
2455 }
2456 }
2457
2458
2459 void nmethod::print_relocations() {
2460 ResourceMark m; // in case methods get printed via the debugger
2461 tty->print_cr("relocations:");
2462 RelocIterator iter(this);
2463 iter.print();
2464 if (UseRelocIndex) {
2465 jint* index_end = (jint*)relocation_end() - 1;
2466 jint index_size = *index_end;
2467 jint* index_start = (jint*)( (address)index_end - index_size );
2468 tty->print_cr(" index @" INTPTR_FORMAT ": index_size=%d", index_start, index_size);
2469 if (index_size > 0) {
2470 jint* ip;
2471 for (ip = index_start; ip+2 <= index_end; ip += 2)
2472 tty->print_cr(" (%d %d) addr=" INTPTR_FORMAT " @" INTPTR_FORMAT,
2473 ip[0],
2474 ip[1],
2475 header_end()+ip[0],
2476 relocation_begin()-1+ip[1]);
2477 for (; ip < index_end; ip++)
2478 tty->print_cr(" (%d ?)", ip[0]);
2479 tty->print_cr(" @" INTPTR_FORMAT ": index_size=%d", ip, *ip++);
2480 tty->print_cr("reloc_end @" INTPTR_FORMAT ":", ip);
2481 }
2482 }
2483 }
2484
2485
2486 void nmethod::print_pcs() {
2487 ResourceMark m; // in case methods get printed via debugger
2488 tty->print_cr("pc-bytecode offsets:");
2489 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2490 p->print(this);
2491 }
2492 }
2493
2494 #endif // PRODUCT
2495
2496 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
2497 RelocIterator iter(this, begin, end);
2498 bool have_one = false;
2499 while (iter.next()) {
2500 have_one = true;
2501 switch (iter.type()) {
2502 case relocInfo::none: return "no_reloc";
2503 case relocInfo::oop_type: {
2504 stringStream st;
2505 oop_Relocation* r = iter.oop_reloc();
2506 oop obj = r->oop_value();
2507 st.print("oop(");
2508 if (obj == NULL) st.print("NULL");
2509 else obj->print_value_on(&st);
2510 st.print(")");
2511 return st.as_string();
2512 }
2513 case relocInfo::virtual_call_type: return "virtual_call";
2514 case relocInfo::opt_virtual_call_type: return "optimized virtual_call";
2515 case relocInfo::static_call_type: return "static_call";
2516 case relocInfo::static_stub_type: return "static_stub";
2517 case relocInfo::runtime_call_type: return "runtime_call";
2518 case relocInfo::external_word_type: return "external_word";
2519 case relocInfo::internal_word_type: return "internal_word";
2520 case relocInfo::section_word_type: return "section_word";
2521 case relocInfo::poll_type: return "poll";
2522 case relocInfo::poll_return_type: return "poll_return";
2523 case relocInfo::type_mask: return "type_bit_mask";
2524 }
2525 }
2526 return have_one ? "other" : NULL;
2527 }
2528
2529 // Return a the last scope in (begin..end]
2530 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
2531 PcDesc* p = pc_desc_near(begin+1);
2532 if (p != NULL && p->real_pc(this) <= end) {
2533 return new ScopeDesc(this, p->scope_decode_offset(),
2534 p->obj_decode_offset(), p->should_reexecute(),
2535 p->return_oop());
2536 }
2537 return NULL;
2538 }
2539
2540 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) {
2541 if (block_begin == entry_point()) stream->print_cr("[Entry Point]");
2542 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]");
2543 if (block_begin == exception_begin()) stream->print_cr("[Exception Handler]");
2544 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]");
2545 if (block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]");
2546
2547 if (has_method_handle_invokes())
2548 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]");
2549
2550 if (block_begin == consts_begin()) stream->print_cr("[Constants]");
2551
2552 if (block_begin == entry_point()) {
2553 methodHandle m = method();
2554 if (m.not_null()) {
2555 stream->print(" # ");
2556 m->print_value_on(stream);
2557 stream->cr();
2558 }
2559 if (m.not_null() && !is_osr_method()) {
2560 ResourceMark rm;
2561 int sizeargs = m->size_of_parameters();
2562 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
2563 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
2564 {
2565 int sig_index = 0;
2566 if (!m->is_static())
2567 sig_bt[sig_index++] = T_OBJECT; // 'this'
2568 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) {
2569 BasicType t = ss.type();
2570 sig_bt[sig_index++] = t;
2571 if (type2size[t] == 2) {
2572 sig_bt[sig_index++] = T_VOID;
2573 } else {
2574 assert(type2size[t] == 1, "size is 1 or 2");
2575 }
2576 }
2577 assert(sig_index == sizeargs, "");
2578 }
2579 const char* spname = "sp"; // make arch-specific?
2580 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false);
2581 int stack_slot_offset = this->frame_size() * wordSize;
2582 int tab1 = 14, tab2 = 24;
2583 int sig_index = 0;
2584 int arg_index = (m->is_static() ? 0 : -1);
2585 bool did_old_sp = false;
2586 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) {
2587 bool at_this = (arg_index == -1);
2588 bool at_old_sp = false;
2589 BasicType t = (at_this ? T_OBJECT : ss.type());
2590 assert(t == sig_bt[sig_index], "sigs in sync");
2591 if (at_this)
2592 stream->print(" # this: ");
2593 else
2594 stream->print(" # parm%d: ", arg_index);
2595 stream->move_to(tab1);
2596 VMReg fst = regs[sig_index].first();
2597 VMReg snd = regs[sig_index].second();
2598 if (fst->is_reg()) {
2599 stream->print("%s", fst->name());
2600 if (snd->is_valid()) {
2601 stream->print(":%s", snd->name());
2602 }
2603 } else if (fst->is_stack()) {
2604 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
2605 if (offset == stack_slot_offset) at_old_sp = true;
2606 stream->print("[%s+0x%x]", spname, offset);
2607 } else {
2608 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
2609 }
2610 stream->print(" ");
2611 stream->move_to(tab2);
2612 stream->print("= ");
2613 if (at_this) {
2614 m->method_holder()->print_value_on(stream);
2615 } else {
2616 bool did_name = false;
2617 if (!at_this && ss.is_object()) {
2618 symbolOop name = ss.as_symbol_or_null();
2619 if (name != NULL) {
2620 name->print_value_on(stream);
2621 did_name = true;
2622 }
2623 }
2624 if (!did_name)
2625 stream->print("%s", type2name(t));
2626 }
2627 if (at_old_sp) {
2628 stream->print(" (%s of caller)", spname);
2629 did_old_sp = true;
2630 }
2631 stream->cr();
2632 sig_index += type2size[t];
2633 arg_index += 1;
2634 if (!at_this) ss.next();
2635 }
2636 if (!did_old_sp) {
2637 stream->print(" # ");
2638 stream->move_to(tab1);
2639 stream->print("[%s+0x%x]", spname, stack_slot_offset);
2640 stream->print(" (%s of caller)", spname);
2641 stream->cr();
2642 }
2643 }
2644 }
2645 }
2646
2647 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) {
2648 // First, find an oopmap in (begin, end].
2649 // We use the odd half-closed interval so that oop maps and scope descs
2650 // which are tied to the byte after a call are printed with the call itself.
2651 address base = code_begin();
2652 OopMapSet* oms = oop_maps();
2653 if (oms != NULL) {
2654 for (int i = 0, imax = oms->size(); i < imax; i++) {
2655 OopMap* om = oms->at(i);
2656 address pc = base + om->offset();
2657 if (pc > begin) {
2658 if (pc <= end) {
2659 st->move_to(column);
2660 st->print("; ");
2661 om->print_on(st);
2662 }
2663 break;
2664 }
2665 }
2666 }
2667
2668 // Print any debug info present at this pc.
2669 ScopeDesc* sd = scope_desc_in(begin, end);
2670 if (sd != NULL) {
2671 st->move_to(column);
2672 if (sd->bci() == SynchronizationEntryBCI) {
2673 st->print(";*synchronization entry");
2674 } else {
2675 if (sd->method().is_null()) {
2676 st->print("method is NULL");
2677 } else if (sd->method()->is_native()) {
2678 st->print("method is native");
2679 } else {
2680 address bcp = sd->method()->bcp_from(sd->bci());
2681 Bytecodes::Code bc = Bytecodes::java_code_at(bcp);
2682 st->print(";*%s", Bytecodes::name(bc));
2683 switch (bc) {
2684 case Bytecodes::_invokevirtual:
2685 case Bytecodes::_invokespecial:
2686 case Bytecodes::_invokestatic:
2687 case Bytecodes::_invokeinterface:
2688 {
2689 Bytecode_invoke* invoke = Bytecode_invoke_at(sd->method(), sd->bci());
2690 st->print(" ");
2691 if (invoke->name() != NULL)
2692 invoke->name()->print_symbol_on(st);
2693 else
2694 st->print("<UNKNOWN>");
2695 break;
2696 }
2697 case Bytecodes::_getfield:
2698 case Bytecodes::_putfield:
2699 case Bytecodes::_getstatic:
2700 case Bytecodes::_putstatic:
2701 {
2702 Bytecode_field* field = Bytecode_field_at(sd->method(), sd->bci());
2703 st->print(" ");
2704 if (field->name() != NULL)
2705 field->name()->print_symbol_on(st);
2706 else
2707 st->print("<UNKNOWN>");
2708 }
2709 }
2710 }
2711 }
2712
2713 // Print all scopes
2714 for (;sd != NULL; sd = sd->sender()) {
2715 st->move_to(column);
2716 st->print("; -");
2717 if (sd->method().is_null()) {
2718 st->print("method is NULL");
2719 } else {
2720 sd->method()->print_short_name(st);
2721 }
2722 int lineno = sd->method()->line_number_from_bci(sd->bci());
2723 if (lineno != -1) {
2724 st->print("@%d (line %d)", sd->bci(), lineno);
2725 } else {
2726 st->print("@%d", sd->bci());
2727 }
2728 st->cr();
2729 }
2730 }
2731
2732 // Print relocation information
2733 const char* str = reloc_string_for(begin, end);
2734 if (str != NULL) {
2735 if (sd != NULL) st->cr();
2736 st->move_to(column);
2737 st->print("; {%s}", str);
2738 }
2739 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin());
2740 if (cont_offset != 0) {
2741 st->move_to(column);
2742 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, code_begin() + cont_offset);
2743 }
2744
2745 }
2746
2747 #ifndef PRODUCT
2748
2749 void nmethod::print_value_on(outputStream* st) const {
2750 print_on(st, "nmethod");
2751 }
2752
2753 void nmethod::print_calls(outputStream* st) {
2754 RelocIterator iter(this);
2755 while (iter.next()) {
2756 switch (iter.type()) {
2757 case relocInfo::virtual_call_type:
2758 case relocInfo::opt_virtual_call_type: {
2759 VerifyMutexLocker mc(CompiledIC_lock);
2760 CompiledIC_at(iter.reloc())->print();
2761 break;
2762 }
2763 case relocInfo::static_call_type:
2764 st->print_cr("Static call at " INTPTR_FORMAT, iter.reloc()->addr());
2765 compiledStaticCall_at(iter.reloc())->print();
2766 break;
2767 }
2768 }
2769 }
2770
2771 void nmethod::print_handler_table() {
2772 ExceptionHandlerTable(this).print();
2773 }
2774
2775 void nmethod::print_nul_chk_table() {
2776 ImplicitExceptionTable(this).print(code_begin());
2777 }
2778
2779 void nmethod::print_statistics() {
2780 ttyLocker ttyl;
2781 if (xtty != NULL) xtty->head("statistics type='nmethod'");
2782 nmethod_stats.print_native_nmethod_stats();
2783 nmethod_stats.print_nmethod_stats();
2784 DebugInformationRecorder::print_statistics();
2785 nmethod_stats.print_pc_stats();
2786 Dependencies::print_statistics();
2787 if (xtty != NULL) xtty->tail("statistics");
2788 }
2789
2790 #endif // PRODUCT