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