1 /*
2 * Copyright (c) 1997, 2011, 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 "precompiled.hpp"
26 #include "code/codeCache.hpp"
27 #include "code/compiledIC.hpp"
28 #include "code/dependencies.hpp"
29 #include "code/nmethod.hpp"
30 #include "code/scopeDesc.hpp"
31 #include "compiler/abstractCompiler.hpp"
32 #include "compiler/compileBroker.hpp"
33 #include "compiler/compileLog.hpp"
34 #include "compiler/compilerOracle.hpp"
35 #include "compiler/disassembler.hpp"
36 #include "interpreter/bytecode.hpp"
37 #include "oops/methodDataOop.hpp"
38 #include "prims/jvmtiRedefineClassesTrace.hpp"
39 #include "prims/jvmtiImpl.hpp"
40 #include "runtime/sharedRuntime.hpp"
41 #include "runtime/sweeper.hpp"
42 #include "utilities/dtrace.hpp"
43 #include "utilities/events.hpp"
44 #include "utilities/xmlstream.hpp"
45 #ifdef SHARK
46 #include "shark/sharkCompiler.hpp"
47 #endif
48
49 #ifdef DTRACE_ENABLED
50
51 // Only bother with this argument setup if dtrace is available
52
53 HS_DTRACE_PROBE_DECL8(hotspot, compiled__method__load,
54 const char*, int, const char*, int, const char*, int, void*, size_t);
55
56 HS_DTRACE_PROBE_DECL6(hotspot, compiled__method__unload,
57 char*, int, char*, int, char*, int);
58
59 #define DTRACE_METHOD_UNLOAD_PROBE(method) \
60 { \
61 methodOop m = (method); \
62 if (m != NULL) { \
63 Symbol* klass_name = m->klass_name(); \
64 Symbol* name = m->name(); \
65 Symbol* signature = m->signature(); \
66 HS_DTRACE_PROBE6(hotspot, compiled__method__unload, \
67 klass_name->bytes(), klass_name->utf8_length(), \
68 name->bytes(), name->utf8_length(), \
69 signature->bytes(), signature->utf8_length()); \
70 } \
71 }
72
73 #else // ndef DTRACE_ENABLED
74
75 #define DTRACE_METHOD_UNLOAD_PROBE(method)
76
77 #endif
78
79 bool nmethod::is_compiled_by_c1() const {
80 if (compiler() == NULL || method() == NULL) return false; // can happen during debug printing
81 if (is_native_method()) return false;
82 return compiler()->is_c1();
83 }
84 bool nmethod::is_compiled_by_c2() const {
85 if (compiler() == NULL || method() == NULL) return false; // can happen during debug printing
86 if (is_native_method()) return false;
87 return compiler()->is_c2();
88 }
89 bool nmethod::is_compiled_by_shark() const {
90 if (is_native_method()) return false;
91 assert(compiler() != NULL, "must be");
92 return compiler()->is_shark();
93 }
94
95
96
97 //---------------------------------------------------------------------------------
98 // NMethod statistics
99 // They are printed under various flags, including:
100 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation.
101 // (In the latter two cases, they like other stats are printed to the log only.)
102
103 #ifndef PRODUCT
104 // These variables are put into one block to reduce relocations
105 // and make it simpler to print from the debugger.
106 static
107 struct nmethod_stats_struct {
108 int nmethod_count;
109 int total_size;
110 int relocation_size;
111 int consts_size;
112 int insts_size;
113 int stub_size;
114 int scopes_data_size;
115 int scopes_pcs_size;
116 int dependencies_size;
117 int handler_table_size;
118 int nul_chk_table_size;
119 int oops_size;
120
121 void note_nmethod(nmethod* nm) {
122 nmethod_count += 1;
123 total_size += nm->size();
124 relocation_size += nm->relocation_size();
125 consts_size += nm->consts_size();
126 insts_size += nm->insts_size();
127 stub_size += nm->stub_size();
128 oops_size += nm->oops_size();
129 scopes_data_size += nm->scopes_data_size();
130 scopes_pcs_size += nm->scopes_pcs_size();
131 dependencies_size += nm->dependencies_size();
132 handler_table_size += nm->handler_table_size();
133 nul_chk_table_size += nm->nul_chk_table_size();
134 }
135 void print_nmethod_stats() {
136 if (nmethod_count == 0) return;
137 tty->print_cr("Statistics for %d bytecoded nmethods:", nmethod_count);
138 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size);
139 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size);
140 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size);
141 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size);
142 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size);
143 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size);
144 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size);
145 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size);
146 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size);
147 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size);
148 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size);
149 }
150
151 int native_nmethod_count;
152 int native_total_size;
153 int native_relocation_size;
154 int native_insts_size;
155 int native_oops_size;
156 void note_native_nmethod(nmethod* nm) {
157 native_nmethod_count += 1;
158 native_total_size += nm->size();
159 native_relocation_size += nm->relocation_size();
160 native_insts_size += nm->insts_size();
161 native_oops_size += nm->oops_size();
162 }
163 void print_native_nmethod_stats() {
164 if (native_nmethod_count == 0) return;
165 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count);
166 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size);
167 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size);
168 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size);
169 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size);
170 }
171
172 int pc_desc_resets; // number of resets (= number of caches)
173 int pc_desc_queries; // queries to nmethod::find_pc_desc
174 int pc_desc_approx; // number of those which have approximate true
175 int pc_desc_repeats; // number of _pc_descs[0] hits
176 int pc_desc_hits; // number of LRU cache hits
177 int pc_desc_tests; // total number of PcDesc examinations
178 int pc_desc_searches; // total number of quasi-binary search steps
179 int pc_desc_adds; // number of LUR cache insertions
180
181 void print_pc_stats() {
182 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query",
183 pc_desc_queries,
184 (double)(pc_desc_tests + pc_desc_searches)
185 / pc_desc_queries);
186 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d",
187 pc_desc_resets,
188 pc_desc_queries, pc_desc_approx,
189 pc_desc_repeats, pc_desc_hits,
190 pc_desc_tests, pc_desc_searches, pc_desc_adds);
191 }
192 } nmethod_stats;
193 #endif //PRODUCT
194
195
196 //---------------------------------------------------------------------------------
197
198
199 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) {
200 assert(pc != NULL, "Must be non null");
201 assert(exception.not_null(), "Must be non null");
202 assert(handler != NULL, "Must be non null");
203
204 _count = 0;
205 _exception_type = exception->klass();
206 _next = NULL;
207
208 add_address_and_handler(pc,handler);
209 }
210
211
212 address ExceptionCache::match(Handle exception, address pc) {
213 assert(pc != NULL,"Must be non null");
214 assert(exception.not_null(),"Must be non null");
215 if (exception->klass() == exception_type()) {
216 return (test_address(pc));
217 }
218
219 return NULL;
220 }
221
222
223 bool ExceptionCache::match_exception_with_space(Handle exception) {
224 assert(exception.not_null(),"Must be non null");
225 if (exception->klass() == exception_type() && count() < cache_size) {
226 return true;
227 }
228 return false;
229 }
230
231
232 address ExceptionCache::test_address(address addr) {
233 for (int i=0; i<count(); i++) {
234 if (pc_at(i) == addr) {
235 return handler_at(i);
236 }
237 }
238 return NULL;
239 }
240
241
242 bool ExceptionCache::add_address_and_handler(address addr, address handler) {
243 if (test_address(addr) == handler) return true;
244 if (count() < cache_size) {
245 set_pc_at(count(),addr);
246 set_handler_at(count(), handler);
247 increment_count();
248 return true;
249 }
250 return false;
251 }
252
253
254 // private method for handling exception cache
255 // These methods are private, and used to manipulate the exception cache
256 // directly.
257 ExceptionCache* nmethod::exception_cache_entry_for_exception(Handle exception) {
258 ExceptionCache* ec = exception_cache();
259 while (ec != NULL) {
260 if (ec->match_exception_with_space(exception)) {
261 return ec;
262 }
263 ec = ec->next();
264 }
265 return NULL;
266 }
267
268
269 //-----------------------------------------------------------------------------
270
271
272 // Helper used by both find_pc_desc methods.
273 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) {
274 NOT_PRODUCT(++nmethod_stats.pc_desc_tests);
275 if (!approximate)
276 return pc->pc_offset() == pc_offset;
277 else
278 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset();
279 }
280
281 void PcDescCache::reset_to(PcDesc* initial_pc_desc) {
282 if (initial_pc_desc == NULL) {
283 _pc_descs[0] = NULL; // native method; no PcDescs at all
284 return;
285 }
286 NOT_PRODUCT(++nmethod_stats.pc_desc_resets);
287 // reset the cache by filling it with benign (non-null) values
288 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel");
289 for (int i = 0; i < cache_size; i++)
290 _pc_descs[i] = initial_pc_desc;
291 }
292
293 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) {
294 NOT_PRODUCT(++nmethod_stats.pc_desc_queries);
295 NOT_PRODUCT(if (approximate) ++nmethod_stats.pc_desc_approx);
296
297 // Note: one might think that caching the most recently
298 // read value separately would be a win, but one would be
299 // wrong. When many threads are updating it, the cache
300 // line it's in would bounce between caches, negating
301 // any benefit.
302
303 // In order to prevent race conditions do not load cache elements
304 // repeatedly, but use a local copy:
305 PcDesc* res;
306
307 // Step one: Check the most recently added value.
308 res = _pc_descs[0];
309 if (res == NULL) return NULL; // native method; no PcDescs at all
310 if (match_desc(res, pc_offset, approximate)) {
311 NOT_PRODUCT(++nmethod_stats.pc_desc_repeats);
312 return res;
313 }
314
315 // Step two: Check the rest of the LRU cache.
316 for (int i = 1; i < cache_size; ++i) {
317 res = _pc_descs[i];
318 if (res->pc_offset() < 0) break; // optimization: skip empty cache
319 if (match_desc(res, pc_offset, approximate)) {
320 NOT_PRODUCT(++nmethod_stats.pc_desc_hits);
321 return res;
322 }
323 }
324
325 // Report failure.
326 return NULL;
327 }
328
329 void PcDescCache::add_pc_desc(PcDesc* pc_desc) {
330 NOT_PRODUCT(++nmethod_stats.pc_desc_adds);
331 // Update the LRU cache by shifting pc_desc forward.
332 for (int i = 0; i < cache_size; i++) {
333 PcDesc* next = _pc_descs[i];
334 _pc_descs[i] = pc_desc;
335 pc_desc = next;
336 }
337 }
338
339 // adjust pcs_size so that it is a multiple of both oopSize and
340 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple
341 // of oopSize, then 2*sizeof(PcDesc) is)
342 static int adjust_pcs_size(int pcs_size) {
343 int nsize = round_to(pcs_size, oopSize);
344 if ((nsize % sizeof(PcDesc)) != 0) {
345 nsize = pcs_size + sizeof(PcDesc);
346 }
347 assert((nsize % oopSize) == 0, "correct alignment");
348 return nsize;
349 }
350
351 //-----------------------------------------------------------------------------
352
353
354 void nmethod::add_exception_cache_entry(ExceptionCache* new_entry) {
355 assert(ExceptionCache_lock->owned_by_self(),"Must hold the ExceptionCache_lock");
356 assert(new_entry != NULL,"Must be non null");
357 assert(new_entry->next() == NULL, "Must be null");
358
359 if (exception_cache() != NULL) {
360 new_entry->set_next(exception_cache());
361 }
362 set_exception_cache(new_entry);
363 }
364
365 void nmethod::remove_from_exception_cache(ExceptionCache* ec) {
366 ExceptionCache* prev = NULL;
367 ExceptionCache* curr = exception_cache();
368 assert(curr != NULL, "nothing to remove");
369 // find the previous and next entry of ec
370 while (curr != ec) {
371 prev = curr;
372 curr = curr->next();
373 assert(curr != NULL, "ExceptionCache not found");
374 }
375 // now: curr == ec
376 ExceptionCache* next = curr->next();
377 if (prev == NULL) {
378 set_exception_cache(next);
379 } else {
380 prev->set_next(next);
381 }
382 delete curr;
383 }
384
385
386 // public method for accessing the exception cache
387 // These are the public access methods.
388 address nmethod::handler_for_exception_and_pc(Handle exception, address pc) {
389 // We never grab a lock to read the exception cache, so we may
390 // have false negatives. This is okay, as it can only happen during
391 // the first few exception lookups for a given nmethod.
392 ExceptionCache* ec = exception_cache();
393 while (ec != NULL) {
394 address ret_val;
395 if ((ret_val = ec->match(exception,pc)) != NULL) {
396 return ret_val;
397 }
398 ec = ec->next();
399 }
400 return NULL;
401 }
402
403
404 void nmethod::add_handler_for_exception_and_pc(Handle exception, address pc, address handler) {
405 // There are potential race conditions during exception cache updates, so we
406 // must own the ExceptionCache_lock before doing ANY modifications. Because
407 // we don't lock during reads, it is possible to have several threads attempt
408 // to update the cache with the same data. We need to check for already inserted
409 // copies of the current data before adding it.
410
411 MutexLocker ml(ExceptionCache_lock);
412 ExceptionCache* target_entry = exception_cache_entry_for_exception(exception);
413
414 if (target_entry == NULL || !target_entry->add_address_and_handler(pc,handler)) {
415 target_entry = new ExceptionCache(exception,pc,handler);
416 add_exception_cache_entry(target_entry);
417 }
418 }
419
420
421 //-------------end of code for ExceptionCache--------------
422
423
424 int nmethod::total_size() const {
425 return
426 consts_size() +
427 insts_size() +
428 stub_size() +
429 scopes_data_size() +
430 scopes_pcs_size() +
431 handler_table_size() +
432 nul_chk_table_size();
433 }
434
435 const char* nmethod::compile_kind() const {
436 if (is_osr_method()) return "osr";
437 if (method() != NULL && is_native_method()) return "c2n";
438 return NULL;
439 }
440
441 // Fill in default values for various flag fields
442 void nmethod::init_defaults() {
443 _state = alive;
444 _marked_for_reclamation = 0;
445 _has_flushed_dependencies = 0;
446 _speculatively_disconnected = 0;
447 _has_unsafe_access = 0;
448 _has_method_handle_invokes = 0;
449 _marked_for_deoptimization = 0;
450 _lock_count = 0;
451 _stack_traversal_mark = 0;
452 _unload_reported = false; // jvmti state
453
454 NOT_PRODUCT(_has_debug_info = false);
455 #ifdef ASSERT
456 _oops_are_stale = false;
457 #endif
458
459 _oops_do_mark_link = NULL;
460 _jmethod_id = NULL;
461 _osr_link = NULL;
462 _scavenge_root_link = NULL;
463 _scavenge_root_state = 0;
464 _saved_nmethod_link = NULL;
465 _compiler = NULL;
466
467 #ifdef HAVE_DTRACE_H
468 _trap_offset = 0;
469 #endif // def HAVE_DTRACE_H
470 }
471
472
473 nmethod* nmethod::new_native_nmethod(methodHandle method,
474 int compile_id,
475 CodeBuffer *code_buffer,
476 int vep_offset,
477 int frame_complete,
478 int frame_size,
479 ByteSize basic_lock_owner_sp_offset,
480 ByteSize basic_lock_sp_offset,
481 OopMapSet* oop_maps) {
482 // create nmethod
483 nmethod* nm = NULL;
484 {
485 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
486 int native_nmethod_size = allocation_size(code_buffer, sizeof(nmethod));
487 CodeOffsets offsets;
488 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
489 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
490 nm = new (native_nmethod_size)
491 nmethod(method(), native_nmethod_size, compile_id, &offsets,
492 code_buffer, frame_size,
493 basic_lock_owner_sp_offset, basic_lock_sp_offset,
494 oop_maps);
495 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_native_nmethod(nm));
496 if (PrintAssembly && nm != NULL)
497 Disassembler::decode(nm);
498 }
499 // verify nmethod
500 debug_only(if (nm) nm->verify();) // might block
501
502 if (nm != NULL) {
503 nm->log_new_nmethod();
504 }
505
506 return nm;
507 }
508
509 #ifdef HAVE_DTRACE_H
510 nmethod* nmethod::new_dtrace_nmethod(methodHandle method,
511 CodeBuffer *code_buffer,
512 int vep_offset,
513 int trap_offset,
514 int frame_complete,
515 int frame_size) {
516 // create nmethod
517 nmethod* nm = NULL;
518 {
519 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
520 int nmethod_size = allocation_size(code_buffer, sizeof(nmethod));
521 CodeOffsets offsets;
522 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
523 offsets.set_value(CodeOffsets::Dtrace_trap, trap_offset);
524 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
525
526 nm = new (nmethod_size) nmethod(method(), nmethod_size, &offsets, code_buffer, frame_size);
527
528 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_nmethod(nm));
529 if (PrintAssembly && nm != NULL)
530 Disassembler::decode(nm);
531 }
532 // verify nmethod
533 debug_only(if (nm) nm->verify();) // might block
534
535 if (nm != NULL) {
536 nm->log_new_nmethod();
537 }
538
539 return nm;
540 }
541
542 #endif // def HAVE_DTRACE_H
543
544 nmethod* nmethod::new_nmethod(methodHandle method,
545 int compile_id,
546 int entry_bci,
547 CodeOffsets* offsets,
548 int orig_pc_offset,
549 DebugInformationRecorder* debug_info,
550 Dependencies* dependencies,
551 CodeBuffer* code_buffer, int frame_size,
552 OopMapSet* oop_maps,
553 ExceptionHandlerTable* handler_table,
554 ImplicitExceptionTable* nul_chk_table,
555 AbstractCompiler* compiler,
556 int comp_level
557 )
558 {
559 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
560 // create nmethod
561 nmethod* nm = NULL;
562 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
563 int nmethod_size =
564 allocation_size(code_buffer, sizeof(nmethod))
565 + adjust_pcs_size(debug_info->pcs_size())
566 + round_to(dependencies->size_in_bytes() , oopSize)
567 + round_to(handler_table->size_in_bytes(), oopSize)
568 + round_to(nul_chk_table->size_in_bytes(), oopSize)
569 + round_to(debug_info->data_size() , oopSize);
570 nm = new (nmethod_size)
571 nmethod(method(), nmethod_size, compile_id, entry_bci, offsets,
572 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size,
573 oop_maps,
574 handler_table,
575 nul_chk_table,
576 compiler,
577 comp_level);
578 if (nm != NULL) {
579 // To make dependency checking during class loading fast, record
580 // the nmethod dependencies in the classes it is dependent on.
581 // This allows the dependency checking code to simply walk the
582 // class hierarchy above the loaded class, checking only nmethods
583 // which are dependent on those classes. The slow way is to
584 // check every nmethod for dependencies which makes it linear in
585 // the number of methods compiled. For applications with a lot
586 // classes the slow way is too slow.
587 for (Dependencies::DepStream deps(nm); deps.next(); ) {
588 klassOop klass = deps.context_type();
589 if (klass == NULL) continue; // ignore things like evol_method
590
591 // record this nmethod as dependent on this klass
592 instanceKlass::cast(klass)->add_dependent_nmethod(nm);
593 }
594 }
595 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_nmethod(nm));
596 if (PrintAssembly && nm != NULL)
597 Disassembler::decode(nm);
598 }
599
600 // verify nmethod
601 debug_only(if (nm) nm->verify();) // might block
602
603 if (nm != NULL) {
604 nm->log_new_nmethod();
605 }
606
607 // done
608 return nm;
609 }
610
611
612 // For native wrappers
613 nmethod::nmethod(
614 methodOop method,
615 int nmethod_size,
616 int compile_id,
617 CodeOffsets* offsets,
618 CodeBuffer* code_buffer,
619 int frame_size,
620 ByteSize basic_lock_owner_sp_offset,
621 ByteSize basic_lock_sp_offset,
622 OopMapSet* oop_maps )
623 : CodeBlob("native nmethod", code_buffer, sizeof(nmethod),
624 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps),
625 _native_receiver_sp_offset(basic_lock_owner_sp_offset),
626 _native_basic_lock_sp_offset(basic_lock_sp_offset)
627 {
628 {
629 debug_only(No_Safepoint_Verifier nsv;)
630 assert_locked_or_safepoint(CodeCache_lock);
631
632 init_defaults();
633 _method = method;
634 _entry_bci = InvocationEntryBci;
635 // We have no exception handler or deopt handler make the
636 // values something that will never match a pc like the nmethod vtable entry
637 _exception_offset = 0;
638 _deoptimize_offset = 0;
639 _deoptimize_mh_offset = 0;
640 _orig_pc_offset = 0;
641
642 _consts_offset = data_offset();
643 _stub_offset = data_offset();
644 _oops_offset = data_offset();
645 _scopes_data_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize);
646 _scopes_pcs_offset = _scopes_data_offset;
647 _dependencies_offset = _scopes_pcs_offset;
648 _handler_table_offset = _dependencies_offset;
649 _nul_chk_table_offset = _handler_table_offset;
650 _nmethod_end_offset = _nul_chk_table_offset;
651 _compile_id = compile_id;
652 _comp_level = CompLevel_none;
653 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
654 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
655 _osr_entry_point = NULL;
656 _exception_cache = NULL;
657 _pc_desc_cache.reset_to(NULL);
658
659 code_buffer->copy_oops_to(this);
660 if (ScavengeRootsInCode && detect_scavenge_root_oops()) {
661 CodeCache::add_scavenge_root_nmethod(this);
662 }
663 debug_only(verify_scavenge_root_oops());
664 CodeCache::commit(this);
665 }
666
667 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
668 ttyLocker ttyl; // keep the following output all in one block
669 // This output goes directly to the tty, not the compiler log.
670 // To enable tools to match it up with the compilation activity,
671 // be sure to tag this tty output with the compile ID.
672 if (xtty != NULL) {
673 xtty->begin_head("print_native_nmethod");
674 xtty->method(_method);
675 xtty->stamp();
676 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
677 }
678 // print the header part first
679 print();
680 // then print the requested information
681 if (PrintNativeNMethods) {
682 print_code();
683 oop_maps->print();
684 }
685 if (PrintRelocations) {
686 print_relocations();
687 }
688 if (xtty != NULL) {
689 xtty->tail("print_native_nmethod");
690 }
691 }
692 Events::log("Create nmethod " INTPTR_FORMAT, this);
693 }
694
695 // For dtrace wrappers
696 #ifdef HAVE_DTRACE_H
697 nmethod::nmethod(
698 methodOop method,
699 int nmethod_size,
700 CodeOffsets* offsets,
701 CodeBuffer* code_buffer,
702 int frame_size)
703 : CodeBlob("dtrace nmethod", code_buffer, sizeof(nmethod),
704 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, NULL),
705 _native_receiver_sp_offset(in_ByteSize(-1)),
706 _native_basic_lock_sp_offset(in_ByteSize(-1))
707 {
708 {
709 debug_only(No_Safepoint_Verifier nsv;)
710 assert_locked_or_safepoint(CodeCache_lock);
711
712 init_defaults();
713 _method = method;
714 _entry_bci = InvocationEntryBci;
715 // We have no exception handler or deopt handler make the
716 // values something that will never match a pc like the nmethod vtable entry
717 _exception_offset = 0;
718 _deoptimize_offset = 0;
719 _deoptimize_mh_offset = 0;
720 _unwind_handler_offset = -1;
721 _trap_offset = offsets->value(CodeOffsets::Dtrace_trap);
722 _orig_pc_offset = 0;
723 _consts_offset = data_offset();
724 _stub_offset = data_offset();
725 _oops_offset = data_offset();
726 _scopes_data_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize);
727 _scopes_pcs_offset = _scopes_data_offset;
728 _dependencies_offset = _scopes_pcs_offset;
729 _handler_table_offset = _dependencies_offset;
730 _nul_chk_table_offset = _handler_table_offset;
731 _nmethod_end_offset = _nul_chk_table_offset;
732 _compile_id = 0; // default
733 _comp_level = CompLevel_none;
734 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
735 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
736 _osr_entry_point = NULL;
737 _exception_cache = NULL;
738 _pc_desc_cache.reset_to(NULL);
739
740 code_buffer->copy_oops_to(this);
741 debug_only(verify_scavenge_root_oops());
742 CodeCache::commit(this);
743 }
744
745 if (PrintNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
746 ttyLocker ttyl; // keep the following output all in one block
747 // This output goes directly to the tty, not the compiler log.
748 // To enable tools to match it up with the compilation activity,
749 // be sure to tag this tty output with the compile ID.
750 if (xtty != NULL) {
751 xtty->begin_head("print_dtrace_nmethod");
752 xtty->method(_method);
753 xtty->stamp();
754 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
755 }
756 // print the header part first
757 print();
758 // then print the requested information
759 if (PrintNMethods) {
760 print_code();
761 }
762 if (PrintRelocations) {
763 print_relocations();
764 }
765 if (xtty != NULL) {
766 xtty->tail("print_dtrace_nmethod");
767 }
768 }
769 Events::log("Create nmethod " INTPTR_FORMAT, this);
770 }
771 #endif // def HAVE_DTRACE_H
772
773 void* nmethod::operator new(size_t size, int nmethod_size) {
774 // Always leave some room in the CodeCache for I2C/C2I adapters
775 if (CodeCache::largest_free_block() < CodeCacheMinimumFreeSpace) return NULL;
776 return CodeCache::allocate(nmethod_size);
777 }
778
779
780 nmethod::nmethod(
781 methodOop method,
782 int nmethod_size,
783 int compile_id,
784 int entry_bci,
785 CodeOffsets* offsets,
786 int orig_pc_offset,
787 DebugInformationRecorder* debug_info,
788 Dependencies* dependencies,
789 CodeBuffer *code_buffer,
790 int frame_size,
791 OopMapSet* oop_maps,
792 ExceptionHandlerTable* handler_table,
793 ImplicitExceptionTable* nul_chk_table,
794 AbstractCompiler* compiler,
795 int comp_level
796 )
797 : CodeBlob("nmethod", code_buffer, sizeof(nmethod),
798 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps),
799 _native_receiver_sp_offset(in_ByteSize(-1)),
800 _native_basic_lock_sp_offset(in_ByteSize(-1))
801 {
802 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
803 {
804 debug_only(No_Safepoint_Verifier nsv;)
805 assert_locked_or_safepoint(CodeCache_lock);
806
807 init_defaults();
808 _method = method;
809 _entry_bci = entry_bci;
810 _compile_id = compile_id;
811 _comp_level = comp_level;
812 _compiler = compiler;
813 _orig_pc_offset = orig_pc_offset;
814
815 // Section offsets
816 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts());
817 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs());
818
819 // Exception handler and deopt handler are in the stub section
820 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set");
821 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set");
822 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
823 _deoptimize_offset = _stub_offset + offsets->value(CodeOffsets::Deopt);
824 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
825 _deoptimize_mh_offset = _stub_offset + offsets->value(CodeOffsets::DeoptMH);
826 } else {
827 _deoptimize_mh_offset = -1;
828 }
829 if (offsets->value(CodeOffsets::UnwindHandler) != -1) {
830 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler);
831 } else {
832 _unwind_handler_offset = -1;
833 }
834
835 _oops_offset = data_offset();
836 _scopes_data_offset = _oops_offset + round_to(code_buffer->total_oop_size (), oopSize);
837 _scopes_pcs_offset = _scopes_data_offset + round_to(debug_info->data_size (), oopSize);
838 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
839 _handler_table_offset = _dependencies_offset + round_to(dependencies->size_in_bytes (), oopSize);
840 _nul_chk_table_offset = _handler_table_offset + round_to(handler_table->size_in_bytes(), oopSize);
841 _nmethod_end_offset = _nul_chk_table_offset + round_to(nul_chk_table->size_in_bytes(), oopSize);
842
843 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
844 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
845 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry);
846 _exception_cache = NULL;
847 _pc_desc_cache.reset_to(scopes_pcs_begin());
848
849 // Copy contents of ScopeDescRecorder to nmethod
850 code_buffer->copy_oops_to(this);
851 debug_info->copy_to(this);
852 dependencies->copy_to(this);
853 if (ScavengeRootsInCode && detect_scavenge_root_oops()) {
854 CodeCache::add_scavenge_root_nmethod(this);
855 }
856 debug_only(verify_scavenge_root_oops());
857
858 CodeCache::commit(this);
859
860 // Copy contents of ExceptionHandlerTable to nmethod
861 handler_table->copy_to(this);
862 nul_chk_table->copy_to(this);
863
864 // we use the information of entry points to find out if a method is
865 // static or non static
866 assert(compiler->is_c2() ||
867 _method->is_static() == (entry_point() == _verified_entry_point),
868 " entry points must be same for static methods and vice versa");
869 }
870
871 bool printnmethods = PrintNMethods
872 || CompilerOracle::should_print(_method)
873 || CompilerOracle::has_option_string(_method, "PrintNMethods");
874 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
875 print_nmethod(printnmethods);
876 }
877
878 // Note: Do not verify in here as the CodeCache_lock is
879 // taken which would conflict with the CompiledIC_lock
880 // which taken during the verification of call sites.
881 // (was bug - gri 10/25/99)
882
883 Events::log("Create nmethod " INTPTR_FORMAT, this);
884 }
885
886
887 // Print a short set of xml attributes to identify this nmethod. The
888 // output should be embedded in some other element.
889 void nmethod::log_identity(xmlStream* log) const {
890 log->print(" compile_id='%d'", compile_id());
891 const char* nm_kind = compile_kind();
892 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind);
893 if (compiler() != NULL) {
894 log->print(" compiler='%s'", compiler()->name());
895 }
896 if (TieredCompilation) {
897 log->print(" level='%d'", comp_level());
898 }
899 }
900
901
902 #define LOG_OFFSET(log, name) \
903 if ((intptr_t)name##_end() - (intptr_t)name##_begin()) \
904 log->print(" " XSTR(name) "_offset='%d'" , \
905 (intptr_t)name##_begin() - (intptr_t)this)
906
907
908 void nmethod::log_new_nmethod() const {
909 if (LogCompilation && xtty != NULL) {
910 ttyLocker ttyl;
911 HandleMark hm;
912 xtty->begin_elem("nmethod");
913 log_identity(xtty);
914 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", code_begin(), size());
915 xtty->print(" address='" INTPTR_FORMAT "'", (intptr_t) this);
916
917 LOG_OFFSET(xtty, relocation);
918 LOG_OFFSET(xtty, consts);
919 LOG_OFFSET(xtty, insts);
920 LOG_OFFSET(xtty, stub);
921 LOG_OFFSET(xtty, scopes_data);
922 LOG_OFFSET(xtty, scopes_pcs);
923 LOG_OFFSET(xtty, dependencies);
924 LOG_OFFSET(xtty, handler_table);
925 LOG_OFFSET(xtty, nul_chk_table);
926 LOG_OFFSET(xtty, oops);
927
928 xtty->method(method());
929 xtty->stamp();
930 xtty->end_elem();
931 }
932 }
933
934 #undef LOG_OFFSET
935
936
937 // Print out more verbose output usually for a newly created nmethod.
938 void nmethod::print_on(outputStream* st, const char* msg) const {
939 if (st != NULL) {
940 ttyLocker ttyl;
941 CompileTask::print_compilation(st, this, msg);
942 if (WizardMode) st->print(" (" INTPTR_FORMAT ")", this);
943 }
944 }
945
946
947 void nmethod::print_nmethod(bool printmethod) {
948 ttyLocker ttyl; // keep the following output all in one block
949 if (xtty != NULL) {
950 xtty->begin_head("print_nmethod");
951 xtty->stamp();
952 xtty->end_head();
953 }
954 // print the header part first
955 print();
956 // then print the requested information
957 if (printmethod) {
958 print_code();
959 print_pcs();
960 oop_maps()->print();
961 }
962 if (PrintDebugInfo) {
963 print_scopes();
964 }
965 if (PrintRelocations) {
966 print_relocations();
967 }
968 if (PrintDependencies) {
969 print_dependencies();
970 }
971 if (PrintExceptionHandlers) {
972 print_handler_table();
973 print_nul_chk_table();
974 }
975 if (xtty != NULL) {
976 xtty->tail("print_nmethod");
977 }
978 }
979
980
981 // Promote one word from an assembly-time handle to a live embedded oop.
982 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
983 if (handle == NULL ||
984 // As a special case, IC oops are initialized to 1 or -1.
985 handle == (jobject) Universe::non_oop_word()) {
986 (*dest) = (oop) handle;
987 } else {
988 (*dest) = JNIHandles::resolve_non_null(handle);
989 }
990 }
991
992
993 void nmethod::copy_oops(GrowableArray<jobject>* array) {
994 //assert(oops_size() == 0, "do this handshake just once, please");
995 int length = array->length();
996 assert((address)(oops_begin() + length) <= data_end(), "oops big enough");
997 oop* dest = oops_begin();
998 for (int index = 0 ; index < length; index++) {
999 initialize_immediate_oop(&dest[index], array->at(index));
1000 }
1001
1002 // Now we can fix up all the oops in the code. We need to do this
1003 // in the code because the assembler uses jobjects as placeholders.
1004 // The code and relocations have already been initialized by the
1005 // CodeBlob constructor, so it is valid even at this early point to
1006 // iterate over relocations and patch the code.
1007 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true);
1008 }
1009
1010
1011 bool nmethod::is_at_poll_return(address pc) {
1012 RelocIterator iter(this, pc, pc+1);
1013 while (iter.next()) {
1014 if (iter.type() == relocInfo::poll_return_type)
1015 return true;
1016 }
1017 return false;
1018 }
1019
1020
1021 bool nmethod::is_at_poll_or_poll_return(address pc) {
1022 RelocIterator iter(this, pc, pc+1);
1023 while (iter.next()) {
1024 relocInfo::relocType t = iter.type();
1025 if (t == relocInfo::poll_return_type || t == relocInfo::poll_type)
1026 return true;
1027 }
1028 return false;
1029 }
1030
1031
1032 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) {
1033 // re-patch all oop-bearing instructions, just in case some oops moved
1034 RelocIterator iter(this, begin, end);
1035 while (iter.next()) {
1036 if (iter.type() == relocInfo::oop_type) {
1037 oop_Relocation* reloc = iter.oop_reloc();
1038 if (initialize_immediates && reloc->oop_is_immediate()) {
1039 oop* dest = reloc->oop_addr();
1040 initialize_immediate_oop(dest, (jobject) *dest);
1041 }
1042 // Refresh the oop-related bits of this instruction.
1043 reloc->fix_oop_relocation();
1044 }
1045
1046 // There must not be any interfering patches or breakpoints.
1047 assert(!(iter.type() == relocInfo::breakpoint_type
1048 && iter.breakpoint_reloc()->active()),
1049 "no active breakpoint");
1050 }
1051 }
1052
1053
1054 void nmethod::verify_oop_relocations() {
1055 // Ensure sure that the code matches the current oop values
1056 RelocIterator iter(this, NULL, NULL);
1057 while (iter.next()) {
1058 if (iter.type() == relocInfo::oop_type) {
1059 oop_Relocation* reloc = iter.oop_reloc();
1060 if (!reloc->oop_is_immediate()) {
1061 reloc->verify_oop_relocation();
1062 }
1063 }
1064 }
1065 }
1066
1067
1068 ScopeDesc* nmethod::scope_desc_at(address pc) {
1069 PcDesc* pd = pc_desc_at(pc);
1070 guarantee(pd != NULL, "scope must be present");
1071 return new ScopeDesc(this, pd->scope_decode_offset(),
1072 pd->obj_decode_offset(), pd->should_reexecute(),
1073 pd->return_oop());
1074 }
1075
1076
1077 void nmethod::clear_inline_caches() {
1078 assert(SafepointSynchronize::is_at_safepoint(), "cleaning of IC's only allowed at safepoint");
1079 if (is_zombie()) {
1080 return;
1081 }
1082
1083 RelocIterator iter(this);
1084 while (iter.next()) {
1085 iter.reloc()->clear_inline_cache();
1086 }
1087 }
1088
1089
1090 void nmethod::cleanup_inline_caches() {
1091
1092 assert_locked_or_safepoint(CompiledIC_lock);
1093
1094 // If the method is not entrant or zombie then a JMP is plastered over the
1095 // first few bytes. If an oop in the old code was there, that oop
1096 // should not get GC'd. Skip the first few bytes of oops on
1097 // not-entrant methods.
1098 address low_boundary = verified_entry_point();
1099 if (!is_in_use()) {
1100 low_boundary += NativeJump::instruction_size;
1101 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1102 // This means that the low_boundary is going to be a little too high.
1103 // This shouldn't matter, since oops of non-entrant methods are never used.
1104 // In fact, why are we bothering to look at oops in a non-entrant method??
1105 }
1106
1107 // Find all calls in an nmethod, and clear the ones that points to zombie methods
1108 ResourceMark rm;
1109 RelocIterator iter(this, low_boundary);
1110 while(iter.next()) {
1111 switch(iter.type()) {
1112 case relocInfo::virtual_call_type:
1113 case relocInfo::opt_virtual_call_type: {
1114 CompiledIC *ic = CompiledIC_at(iter.reloc());
1115 // Ok, to lookup references to zombies here
1116 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
1117 if( cb != NULL && cb->is_nmethod() ) {
1118 nmethod* nm = (nmethod*)cb;
1119 // Clean inline caches pointing to both zombie and not_entrant methods
1120 if (!nm->is_in_use() || (nm->method()->code() != nm)) ic->set_to_clean();
1121 }
1122 break;
1123 }
1124 case relocInfo::static_call_type: {
1125 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
1126 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
1127 if( cb != NULL && cb->is_nmethod() ) {
1128 nmethod* nm = (nmethod*)cb;
1129 // Clean inline caches pointing to both zombie and not_entrant methods
1130 if (!nm->is_in_use() || (nm->method()->code() != nm)) csc->set_to_clean();
1131 }
1132 break;
1133 }
1134 }
1135 }
1136 }
1137
1138 // This is a private interface with the sweeper.
1139 void nmethod::mark_as_seen_on_stack() {
1140 assert(is_not_entrant(), "must be a non-entrant method");
1141 // Set the traversal mark to ensure that the sweeper does 2
1142 // cleaning passes before moving to zombie.
1143 set_stack_traversal_mark(NMethodSweeper::traversal_count());
1144 }
1145
1146 // Tell if a non-entrant method can be converted to a zombie (i.e.,
1147 // there are no activations on the stack, not in use by the VM,
1148 // and not in use by the ServiceThread)
1149 bool nmethod::can_not_entrant_be_converted() {
1150 assert(is_not_entrant(), "must be a non-entrant method");
1151
1152 // Since the nmethod sweeper only does partial sweep the sweeper's traversal
1153 // count can be greater than the stack traversal count before it hits the
1154 // nmethod for the second time.
1155 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count() &&
1156 !is_locked_by_vm();
1157 }
1158
1159 void nmethod::inc_decompile_count() {
1160 if (!is_compiled_by_c2()) return;
1161 // Could be gated by ProfileTraps, but do not bother...
1162 methodOop m = method();
1163 if (m == NULL) return;
1164 methodDataOop mdo = m->method_data();
1165 if (mdo == NULL) return;
1166 // There is a benign race here. See comments in methodDataOop.hpp.
1167 mdo->inc_decompile_count();
1168 }
1169
1170 void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) {
1171
1172 post_compiled_method_unload();
1173
1174 // Since this nmethod is being unloaded, make sure that dependencies
1175 // recorded in instanceKlasses get flushed and pass non-NULL closure to
1176 // indicate that this work is being done during a GC.
1177 assert(Universe::heap()->is_gc_active(), "should only be called during gc");
1178 assert(is_alive != NULL, "Should be non-NULL");
1179 // A non-NULL is_alive closure indicates that this is being called during GC.
1180 flush_dependencies(is_alive);
1181
1182 // Break cycle between nmethod & method
1183 if (TraceClassUnloading && WizardMode) {
1184 tty->print_cr("[Class unloading: Making nmethod " INTPTR_FORMAT
1185 " unloadable], methodOop(" INTPTR_FORMAT
1186 "), cause(" INTPTR_FORMAT ")",
1187 this, (address)_method, (address)cause);
1188 if (!Universe::heap()->is_gc_active())
1189 cause->klass()->print();
1190 }
1191 // Unlink the osr method, so we do not look this up again
1192 if (is_osr_method()) {
1193 invalidate_osr_method();
1194 }
1195 // If _method is already NULL the methodOop is about to be unloaded,
1196 // so we don't have to break the cycle. Note that it is possible to
1197 // have the methodOop live here, in case we unload the nmethod because
1198 // it is pointing to some oop (other than the methodOop) being unloaded.
1199 if (_method != NULL) {
1200 // OSR methods point to the methodOop, but the methodOop does not
1201 // point back!
1202 if (_method->code() == this) {
1203 _method->clear_code(); // Break a cycle
1204 }
1205 _method = NULL; // Clear the method of this dead nmethod
1206 }
1207 // Make the class unloaded - i.e., change state and notify sweeper
1208 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
1209 if (is_in_use()) {
1210 // Transitioning directly from live to unloaded -- so
1211 // we need to force a cache clean-up; remember this
1212 // for later on.
1213 CodeCache::set_needs_cache_clean(true);
1214 }
1215 _state = unloaded;
1216
1217 // Log the unloading.
1218 log_state_change();
1219
1220 // The methodOop is gone at this point
1221 assert(_method == NULL, "Tautology");
1222
1223 set_osr_link(NULL);
1224 //set_scavenge_root_link(NULL); // done by prune_scavenge_root_nmethods
1225 NMethodSweeper::notify(this);
1226 }
1227
1228 void nmethod::invalidate_osr_method() {
1229 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
1230 // Remove from list of active nmethods
1231 if (method() != NULL)
1232 instanceKlass::cast(method()->method_holder())->remove_osr_nmethod(this);
1233 // Set entry as invalid
1234 _entry_bci = InvalidOSREntryBci;
1235 }
1236
1237 void nmethod::log_state_change() const {
1238 if (LogCompilation) {
1239 if (xtty != NULL) {
1240 ttyLocker ttyl; // keep the following output all in one block
1241 if (_state == unloaded) {
1242 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'",
1243 os::current_thread_id());
1244 } else {
1245 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s",
1246 os::current_thread_id(),
1247 (_state == zombie ? " zombie='1'" : ""));
1248 }
1249 log_identity(xtty);
1250 xtty->stamp();
1251 xtty->end_elem();
1252 }
1253 }
1254 if (PrintCompilation && _state != unloaded) {
1255 print_on(tty, _state == zombie ? "made zombie" : "made not entrant");
1256 }
1257 }
1258
1259 // Common functionality for both make_not_entrant and make_zombie
1260 bool nmethod::make_not_entrant_or_zombie(unsigned int state) {
1261 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant");
1262 assert(!is_zombie(), "should not already be a zombie");
1263
1264 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below.
1265 nmethodLocker nml(this);
1266 methodHandle the_method(method());
1267 No_Safepoint_Verifier nsv;
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 (_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 }
1294
1295 if (is_in_use()) {
1296 // It's a true state change, so mark the method as decompiled.
1297 // Do it only for transition from alive.
1298 inc_decompile_count();
1299 }
1300
1301 // Change state
1302 _state = state;
1303
1304 // Log the transition once
1305 log_state_change();
1306
1307 // Remove nmethod from method.
1308 // We need to check if both the _code and _from_compiled_code_entry_point
1309 // refer to this nmethod because there is a race in setting these two fields
1310 // in methodOop as seen in bugid 4947125.
1311 // If the vep() points to the zombie nmethod, the memory for the nmethod
1312 // could be flushed and the compiler and vtable stubs could still call
1313 // through it.
1314 if (method() != NULL && (method()->code() == this ||
1315 method()->from_compiled_entry() == verified_entry_point())) {
1316 HandleMark hm;
1317 method()->clear_code();
1318 }
1319
1320 if (state == not_entrant) {
1321 mark_as_seen_on_stack();
1322 }
1323
1324 } // leave critical region under Patching_lock
1325
1326 // When the nmethod becomes zombie it is no longer alive so the
1327 // dependencies must be flushed. nmethods in the not_entrant
1328 // state will be flushed later when the transition to zombie
1329 // happens or they get unloaded.
1330 if (state == zombie) {
1331 {
1332 // Flushing dependecies must be done before any possible
1333 // safepoint can sneak in, otherwise the oops used by the
1334 // dependency logic could have become stale.
1335 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1336 flush_dependencies(NULL);
1337 }
1338
1339 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload
1340 // event and it hasn't already been reported for this nmethod then
1341 // report it now. The event may have been reported earilier if the GC
1342 // marked it for unloading). JvmtiDeferredEventQueue support means
1343 // we no longer go to a safepoint here.
1344 post_compiled_method_unload();
1345
1346 #ifdef ASSERT
1347 // It's no longer safe to access the oops section since zombie
1348 // nmethods aren't scanned for GC.
1349 _oops_are_stale = true;
1350 #endif
1351 } else {
1352 assert(state == not_entrant, "other cases may need to be handled differently");
1353 }
1354
1355 if (TraceCreateZombies) {
1356 tty->print_cr("nmethod <" INTPTR_FORMAT "> code made %s", this, (state == not_entrant) ? "not entrant" : "zombie");
1357 }
1358
1359 // Make sweeper aware that there is a zombie method that needs to be removed
1360 NMethodSweeper::notify(this);
1361
1362 return true;
1363 }
1364
1365 void nmethod::flush() {
1366 // Note that there are no valid oops in the nmethod anymore.
1367 assert(is_zombie() || (is_osr_method() && is_unloaded()), "must be a zombie method");
1368 assert(is_marked_for_reclamation() || (is_osr_method() && is_unloaded()), "must be marked for reclamation");
1369
1370 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed");
1371 assert_locked_or_safepoint(CodeCache_lock);
1372
1373 // completely deallocate this method
1374 EventMark m("flushing nmethod " INTPTR_FORMAT " %s", this, "");
1375 if (PrintMethodFlushing) {
1376 tty->print_cr("*flushing nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT "/Free CodeCache:" SIZE_FORMAT "Kb",
1377 _compile_id, this, CodeCache::nof_blobs(), CodeCache::unallocated_capacity()/1024);
1378 }
1379
1380 // We need to deallocate any ExceptionCache data.
1381 // Note that we do not need to grab the nmethod lock for this, it
1382 // better be thread safe if we're disposing of it!
1383 ExceptionCache* ec = exception_cache();
1384 set_exception_cache(NULL);
1385 while(ec != NULL) {
1386 ExceptionCache* next = ec->next();
1387 delete ec;
1388 ec = next;
1389 }
1390
1391 if (on_scavenge_root_list()) {
1392 CodeCache::drop_scavenge_root_nmethod(this);
1393 }
1394
1395 if (is_speculatively_disconnected()) {
1396 CodeCache::remove_saved_code(this);
1397 }
1398
1399 #ifdef SHARK
1400 ((SharkCompiler *) compiler())->free_compiled_method(insts_begin());
1401 #endif // SHARK
1402
1403 ((CodeBlob*)(this))->flush();
1404
1405 CodeCache::free(this);
1406 }
1407
1408
1409 //
1410 // Notify all classes this nmethod is dependent on that it is no
1411 // longer dependent. This should only be called in two situations.
1412 // First, when a nmethod transitions to a zombie all dependents need
1413 // to be clear. Since zombification happens at a safepoint there's no
1414 // synchronization issues. The second place is a little more tricky.
1415 // During phase 1 of mark sweep class unloading may happen and as a
1416 // result some nmethods may get unloaded. In this case the flushing
1417 // of dependencies must happen during phase 1 since after GC any
1418 // dependencies in the unloaded nmethod won't be updated, so
1419 // traversing the dependency information in unsafe. In that case this
1420 // function is called with a non-NULL argument and this function only
1421 // notifies instanceKlasses that are reachable
1422
1423 void nmethod::flush_dependencies(BoolObjectClosure* is_alive) {
1424 assert_locked_or_safepoint(CodeCache_lock);
1425 assert(Universe::heap()->is_gc_active() == (is_alive != NULL),
1426 "is_alive is non-NULL if and only if we are called during GC");
1427 if (!has_flushed_dependencies()) {
1428 set_has_flushed_dependencies();
1429 for (Dependencies::DepStream deps(this); deps.next(); ) {
1430 klassOop klass = deps.context_type();
1431 if (klass == NULL) continue; // ignore things like evol_method
1432
1433 // During GC the is_alive closure is non-NULL, and is used to
1434 // determine liveness of dependees that need to be updated.
1435 if (is_alive == NULL || is_alive->do_object_b(klass)) {
1436 instanceKlass::cast(klass)->remove_dependent_nmethod(this);
1437 }
1438 }
1439 }
1440 }
1441
1442
1443 // If this oop is not live, the nmethod can be unloaded.
1444 bool nmethod::can_unload(BoolObjectClosure* is_alive,
1445 OopClosure* keep_alive,
1446 oop* root, bool unloading_occurred) {
1447 assert(root != NULL, "just checking");
1448 oop obj = *root;
1449 if (obj == NULL || is_alive->do_object_b(obj)) {
1450 return false;
1451 }
1452 if (obj->is_compiledICHolder()) {
1453 compiledICHolderOop cichk_oop = compiledICHolderOop(obj);
1454 if (is_alive->do_object_b(
1455 cichk_oop->holder_method()->method_holder()) &&
1456 is_alive->do_object_b(cichk_oop->holder_klass())) {
1457 // The oop should be kept alive
1458 keep_alive->do_oop(root);
1459 return false;
1460 }
1461 }
1462 // If ScavengeRootsInCode is true, an nmethod might be unloaded
1463 // simply because one of its constant oops has gone dead.
1464 // No actual classes need to be unloaded in order for this to occur.
1465 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading");
1466 make_unloaded(is_alive, obj);
1467 return true;
1468 }
1469
1470 // ------------------------------------------------------------------
1471 // post_compiled_method_load_event
1472 // new method for install_code() path
1473 // Transfer information from compilation to jvmti
1474 void nmethod::post_compiled_method_load_event() {
1475
1476 methodOop moop = method();
1477 HS_DTRACE_PROBE8(hotspot, compiled__method__load,
1478 moop->klass_name()->bytes(),
1479 moop->klass_name()->utf8_length(),
1480 moop->name()->bytes(),
1481 moop->name()->utf8_length(),
1482 moop->signature()->bytes(),
1483 moop->signature()->utf8_length(),
1484 insts_begin(), insts_size());
1485
1486 if (JvmtiExport::should_post_compiled_method_load() ||
1487 JvmtiExport::should_post_compiled_method_unload()) {
1488 get_and_cache_jmethod_id();
1489 }
1490
1491 if (JvmtiExport::should_post_compiled_method_load()) {
1492 // Let the Service thread (which is a real Java thread) post the event
1493 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1494 JvmtiDeferredEventQueue::enqueue(
1495 JvmtiDeferredEvent::compiled_method_load_event(this));
1496 }
1497 }
1498
1499 jmethodID nmethod::get_and_cache_jmethod_id() {
1500 if (_jmethod_id == NULL) {
1501 // Cache the jmethod_id since it can no longer be looked up once the
1502 // method itself has been marked for unloading.
1503 _jmethod_id = method()->jmethod_id();
1504 }
1505 return _jmethod_id;
1506 }
1507
1508 void nmethod::post_compiled_method_unload() {
1509 if (unload_reported()) {
1510 // During unloading we transition to unloaded and then to zombie
1511 // and the unloading is reported during the first transition.
1512 return;
1513 }
1514
1515 assert(_method != NULL && !is_unloaded(), "just checking");
1516 DTRACE_METHOD_UNLOAD_PROBE(method());
1517
1518 // If a JVMTI agent has enabled the CompiledMethodUnload event then
1519 // post the event. Sometime later this nmethod will be made a zombie
1520 // by the sweeper but the methodOop will not be valid at that point.
1521 // If the _jmethod_id is null then no load event was ever requested
1522 // so don't bother posting the unload. The main reason for this is
1523 // that the jmethodID is a weak reference to the methodOop so if
1524 // it's being unloaded there's no way to look it up since the weak
1525 // ref will have been cleared.
1526 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) {
1527 assert(!unload_reported(), "already unloaded");
1528 JvmtiDeferredEvent event =
1529 JvmtiDeferredEvent::compiled_method_unload_event(this,
1530 _jmethod_id, insts_begin());
1531 if (SafepointSynchronize::is_at_safepoint()) {
1532 // Don't want to take the queueing lock. Add it as pending and
1533 // it will get enqueued later.
1534 JvmtiDeferredEventQueue::add_pending_event(event);
1535 } else {
1536 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1537 JvmtiDeferredEventQueue::enqueue(event);
1538 }
1539 }
1540
1541 // The JVMTI CompiledMethodUnload event can be enabled or disabled at
1542 // any time. As the nmethod is being unloaded now we mark it has
1543 // having the unload event reported - this will ensure that we don't
1544 // attempt to report the event in the unlikely scenario where the
1545 // event is enabled at the time the nmethod is made a zombie.
1546 set_unload_reported();
1547 }
1548
1549 // This is called at the end of the strong tracing/marking phase of a
1550 // GC to unload an nmethod if it contains otherwise unreachable
1551 // oops.
1552
1553 void nmethod::do_unloading(BoolObjectClosure* is_alive,
1554 OopClosure* keep_alive, bool unloading_occurred) {
1555 // Make sure the oop's ready to receive visitors
1556 assert(!is_zombie() && !is_unloaded(),
1557 "should not call follow on zombie or unloaded nmethod");
1558
1559 // If the method is not entrant then a JMP is plastered over the
1560 // first few bytes. If an oop in the old code was there, that oop
1561 // should not get GC'd. Skip the first few bytes of oops on
1562 // not-entrant methods.
1563 address low_boundary = verified_entry_point();
1564 if (is_not_entrant()) {
1565 low_boundary += NativeJump::instruction_size;
1566 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1567 // (See comment above.)
1568 }
1569
1570 // The RedefineClasses() API can cause the class unloading invariant
1571 // to no longer be true. See jvmtiExport.hpp for details.
1572 // Also, leave a debugging breadcrumb in local flag.
1573 bool a_class_was_redefined = JvmtiExport::has_redefined_a_class();
1574 if (a_class_was_redefined) {
1575 // This set of the unloading_occurred flag is done before the
1576 // call to post_compiled_method_unload() so that the unloading
1577 // of this nmethod is reported.
1578 unloading_occurred = true;
1579 }
1580
1581 // Follow methodOop
1582 if (can_unload(is_alive, keep_alive, (oop*)&_method, unloading_occurred)) {
1583 return;
1584 }
1585
1586 // Exception cache
1587 ExceptionCache* ec = exception_cache();
1588 while (ec != NULL) {
1589 oop* ex_addr = (oop*)ec->exception_type_addr();
1590 oop ex = *ex_addr;
1591 ExceptionCache* next_ec = ec->next();
1592 if (ex != NULL && !is_alive->do_object_b(ex)) {
1593 assert(!ex->is_compiledICHolder(), "Possible error here");
1594 remove_from_exception_cache(ec);
1595 }
1596 ec = next_ec;
1597 }
1598
1599 // If class unloading occurred we first iterate over all inline caches and
1600 // clear ICs where the cached oop is referring to an unloaded klass or method.
1601 // The remaining live cached oops will be traversed in the relocInfo::oop_type
1602 // iteration below.
1603 if (unloading_occurred) {
1604 RelocIterator iter(this, low_boundary);
1605 while(iter.next()) {
1606 if (iter.type() == relocInfo::virtual_call_type) {
1607 CompiledIC *ic = CompiledIC_at(iter.reloc());
1608 oop ic_oop = ic->cached_oop();
1609 if (ic_oop != NULL && !is_alive->do_object_b(ic_oop)) {
1610 // The only exception is compiledICHolder oops which may
1611 // yet be marked below. (We check this further below).
1612 if (ic_oop->is_compiledICHolder()) {
1613 compiledICHolderOop cichk_oop = compiledICHolderOop(ic_oop);
1614 if (is_alive->do_object_b(
1615 cichk_oop->holder_method()->method_holder()) &&
1616 is_alive->do_object_b(cichk_oop->holder_klass())) {
1617 continue;
1618 }
1619 }
1620 ic->set_to_clean();
1621 assert(ic->cached_oop() == NULL,
1622 "cached oop in IC should be cleared");
1623 }
1624 }
1625 }
1626 }
1627
1628 // Compiled code
1629 RelocIterator iter(this, low_boundary);
1630 while (iter.next()) {
1631 if (iter.type() == relocInfo::oop_type) {
1632 oop_Relocation* r = iter.oop_reloc();
1633 // In this loop, we must only traverse those oops directly embedded in
1634 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1635 assert(1 == (r->oop_is_immediate()) +
1636 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1637 "oop must be found in exactly one place");
1638 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1639 if (can_unload(is_alive, keep_alive, r->oop_addr(), unloading_occurred)) {
1640 return;
1641 }
1642 }
1643 }
1644 }
1645
1646
1647 // Scopes
1648 for (oop* p = oops_begin(); p < oops_end(); p++) {
1649 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1650 if (can_unload(is_alive, keep_alive, p, unloading_occurred)) {
1651 return;
1652 }
1653 }
1654
1655 #ifndef PRODUCT
1656 // This nmethod was not unloaded; check below that all CompiledICs
1657 // refer to marked oops.
1658 {
1659 RelocIterator iter(this, low_boundary);
1660 while (iter.next()) {
1661 if (iter.type() == relocInfo::virtual_call_type) {
1662 CompiledIC *ic = CompiledIC_at(iter.reloc());
1663 oop ic_oop = ic->cached_oop();
1664 assert(ic_oop == NULL || is_alive->do_object_b(ic_oop),
1665 "Found unmarked ic_oop in reachable nmethod");
1666 }
1667 }
1668 }
1669 #endif // !PRODUCT
1670 }
1671
1672 // This method is called twice during GC -- once while
1673 // tracing the "active" nmethods on thread stacks during
1674 // the (strong) marking phase, and then again when walking
1675 // the code cache contents during the weak roots processing
1676 // phase. The two uses are distinguished by means of the
1677 // 'do_strong_roots_only' flag, which is true in the first
1678 // case. We want to walk the weak roots in the nmethod
1679 // only in the second case. The weak roots in the nmethod
1680 // are the oops in the ExceptionCache and the InlineCache
1681 // oops.
1682 void nmethod::oops_do(OopClosure* f, bool do_strong_roots_only) {
1683 // make sure the oops ready to receive visitors
1684 assert(!is_zombie() && !is_unloaded(),
1685 "should not call follow on zombie or unloaded nmethod");
1686
1687 // If the method is not entrant or zombie then a JMP is plastered over the
1688 // first few bytes. If an oop in the old code was there, that oop
1689 // should not get GC'd. Skip the first few bytes of oops on
1690 // not-entrant methods.
1691 address low_boundary = verified_entry_point();
1692 if (is_not_entrant()) {
1693 low_boundary += NativeJump::instruction_size;
1694 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1695 // (See comment above.)
1696 }
1697
1698 // Compiled code
1699 f->do_oop((oop*) &_method);
1700 if (!do_strong_roots_only) {
1701 // weak roots processing phase -- update ExceptionCache oops
1702 ExceptionCache* ec = exception_cache();
1703 while(ec != NULL) {
1704 f->do_oop((oop*)ec->exception_type_addr());
1705 ec = ec->next();
1706 }
1707 } // Else strong roots phase -- skip oops in ExceptionCache
1708
1709 RelocIterator iter(this, low_boundary);
1710
1711 while (iter.next()) {
1712 if (iter.type() == relocInfo::oop_type ) {
1713 oop_Relocation* r = iter.oop_reloc();
1714 // In this loop, we must only follow those oops directly embedded in
1715 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1716 assert(1 == (r->oop_is_immediate()) +
1717 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1718 "oop must be found in exactly one place");
1719 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1720 f->do_oop(r->oop_addr());
1721 }
1722 }
1723 }
1724
1725 // Scopes
1726 // This includes oop constants not inlined in the code stream.
1727 for (oop* p = oops_begin(); p < oops_end(); p++) {
1728 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1729 f->do_oop(p);
1730 }
1731 }
1732
1733 #define NMETHOD_SENTINEL ((nmethod*)badAddress)
1734
1735 nmethod* volatile nmethod::_oops_do_mark_nmethods;
1736
1737 // An nmethod is "marked" if its _mark_link is set non-null.
1738 // Even if it is the end of the linked list, it will have a non-null link value,
1739 // as long as it is on the list.
1740 // This code must be MP safe, because it is used from parallel GC passes.
1741 bool nmethod::test_set_oops_do_mark() {
1742 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");
1743 nmethod* observed_mark_link = _oops_do_mark_link;
1744 if (observed_mark_link == NULL) {
1745 // Claim this nmethod for this thread to mark.
1746 observed_mark_link = (nmethod*)
1747 Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_link, NULL);
1748 if (observed_mark_link == NULL) {
1749
1750 // Atomically append this nmethod (now claimed) to the head of the list:
1751 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods;
1752 for (;;) {
1753 nmethod* required_mark_nmethods = observed_mark_nmethods;
1754 _oops_do_mark_link = required_mark_nmethods;
1755 observed_mark_nmethods = (nmethod*)
1756 Atomic::cmpxchg_ptr(this, &_oops_do_mark_nmethods, required_mark_nmethods);
1757 if (observed_mark_nmethods == required_mark_nmethods)
1758 break;
1759 }
1760 // Mark was clear when we first saw this guy.
1761 NOT_PRODUCT(if (TraceScavenge) print_on(tty, "oops_do, mark"));
1762 return false;
1763 }
1764 }
1765 // On fall through, another racing thread marked this nmethod before we did.
1766 return true;
1767 }
1768
1769 void nmethod::oops_do_marking_prologue() {
1770 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("[oops_do_marking_prologue"));
1771 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row");
1772 // We use cmpxchg_ptr instead of regular assignment here because the user
1773 // may fork a bunch of threads, and we need them all to see the same state.
1774 void* observed = Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, NULL);
1775 guarantee(observed == NULL, "no races in this sequential code");
1776 }
1777
1778 void nmethod::oops_do_marking_epilogue() {
1779 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row");
1780 nmethod* cur = _oops_do_mark_nmethods;
1781 while (cur != NMETHOD_SENTINEL) {
1782 assert(cur != NULL, "not NULL-terminated");
1783 nmethod* next = cur->_oops_do_mark_link;
1784 cur->_oops_do_mark_link = NULL;
1785 cur->fix_oop_relocations();
1786 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark"));
1787 cur = next;
1788 }
1789 void* required = _oops_do_mark_nmethods;
1790 void* observed = Atomic::cmpxchg_ptr(NULL, &_oops_do_mark_nmethods, required);
1791 guarantee(observed == required, "no races in this sequential code");
1792 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("oops_do_marking_epilogue]"));
1793 }
1794
1795 class DetectScavengeRoot: public OopClosure {
1796 bool _detected_scavenge_root;
1797 public:
1798 DetectScavengeRoot() : _detected_scavenge_root(false)
1799 { NOT_PRODUCT(_print_nm = NULL); }
1800 bool detected_scavenge_root() { return _detected_scavenge_root; }
1801 virtual void do_oop(oop* p) {
1802 if ((*p) != NULL && (*p)->is_scavengable()) {
1803 NOT_PRODUCT(maybe_print(p));
1804 _detected_scavenge_root = true;
1805 }
1806 }
1807 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
1808
1809 #ifndef PRODUCT
1810 nmethod* _print_nm;
1811 void maybe_print(oop* p) {
1812 if (_print_nm == NULL) return;
1813 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root");
1814 tty->print_cr(""PTR_FORMAT"[offset=%d] detected scavengable oop "PTR_FORMAT" (found at "PTR_FORMAT")",
1815 _print_nm, (int)((intptr_t)p - (intptr_t)_print_nm),
1816 (intptr_t)(*p), (intptr_t)p);
1817 (*p)->print();
1818 }
1819 #endif //PRODUCT
1820 };
1821
1822 bool nmethod::detect_scavenge_root_oops() {
1823 DetectScavengeRoot detect_scavenge_root;
1824 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this);
1825 oops_do(&detect_scavenge_root);
1826 return detect_scavenge_root.detected_scavenge_root();
1827 }
1828
1829 // Method that knows how to preserve outgoing arguments at call. This method must be
1830 // called with a frame corresponding to a Java invoke
1831 void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) {
1832 #ifndef SHARK
1833 if (!method()->is_native()) {
1834 SimpleScopeDesc ssd(this, fr.pc());
1835 Bytecode_invoke call(ssd.method(), ssd.bci());
1836 // compiled invokedynamic call sites have an implicit receiver at
1837 // resolution time, so make sure it gets GC'ed.
1838 bool has_receiver = !call.is_invokestatic();
1839 Symbol* signature = call.signature();
1840 fr.oops_compiled_arguments_do(signature, has_receiver, reg_map, f);
1841 }
1842 #endif // !SHARK
1843 }
1844
1845
1846 oop nmethod::embeddedOop_at(u_char* p) {
1847 RelocIterator iter(this, p, p + 1);
1848 while (iter.next())
1849 if (iter.type() == relocInfo::oop_type) {
1850 return iter.oop_reloc()->oop_value();
1851 }
1852 return NULL;
1853 }
1854
1855
1856 inline bool includes(void* p, void* from, void* to) {
1857 return from <= p && p < to;
1858 }
1859
1860
1861 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
1862 assert(count >= 2, "must be sentinel values, at least");
1863
1864 #ifdef ASSERT
1865 // must be sorted and unique; we do a binary search in find_pc_desc()
1866 int prev_offset = pcs[0].pc_offset();
1867 assert(prev_offset == PcDesc::lower_offset_limit,
1868 "must start with a sentinel");
1869 for (int i = 1; i < count; i++) {
1870 int this_offset = pcs[i].pc_offset();
1871 assert(this_offset > prev_offset, "offsets must be sorted");
1872 prev_offset = this_offset;
1873 }
1874 assert(prev_offset == PcDesc::upper_offset_limit,
1875 "must end with a sentinel");
1876 #endif //ASSERT
1877
1878 // Search for MethodHandle invokes and tag the nmethod.
1879 for (int i = 0; i < count; i++) {
1880 if (pcs[i].is_method_handle_invoke()) {
1881 set_has_method_handle_invokes(true);
1882 break;
1883 }
1884 }
1885 assert(has_method_handle_invokes() == (_deoptimize_mh_offset != -1), "must have deopt mh handler");
1886
1887 int size = count * sizeof(PcDesc);
1888 assert(scopes_pcs_size() >= size, "oob");
1889 memcpy(scopes_pcs_begin(), pcs, size);
1890
1891 // Adjust the final sentinel downward.
1892 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
1893 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
1894 last_pc->set_pc_offset(content_size() + 1);
1895 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
1896 // Fill any rounding gaps with copies of the last record.
1897 last_pc[1] = last_pc[0];
1898 }
1899 // The following assert could fail if sizeof(PcDesc) is not
1900 // an integral multiple of oopSize (the rounding term).
1901 // If it fails, change the logic to always allocate a multiple
1902 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
1903 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
1904 }
1905
1906 void nmethod::copy_scopes_data(u_char* buffer, int size) {
1907 assert(scopes_data_size() >= size, "oob");
1908 memcpy(scopes_data_begin(), buffer, size);
1909 }
1910
1911
1912 #ifdef ASSERT
1913 static PcDesc* linear_search(nmethod* nm, int pc_offset, bool approximate) {
1914 PcDesc* lower = nm->scopes_pcs_begin();
1915 PcDesc* upper = nm->scopes_pcs_end();
1916 lower += 1; // exclude initial sentinel
1917 PcDesc* res = NULL;
1918 for (PcDesc* p = lower; p < upper; p++) {
1919 NOT_PRODUCT(--nmethod_stats.pc_desc_tests); // don't count this call to match_desc
1920 if (match_desc(p, pc_offset, approximate)) {
1921 if (res == NULL)
1922 res = p;
1923 else
1924 res = (PcDesc*) badAddress;
1925 }
1926 }
1927 return res;
1928 }
1929 #endif
1930
1931
1932 // Finds a PcDesc with real-pc equal to "pc"
1933 PcDesc* nmethod::find_pc_desc_internal(address pc, bool approximate) {
1934 address base_address = code_begin();
1935 if ((pc < base_address) ||
1936 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
1937 return NULL; // PC is wildly out of range
1938 }
1939 int pc_offset = (int) (pc - base_address);
1940
1941 // Check the PcDesc cache if it contains the desired PcDesc
1942 // (This as an almost 100% hit rate.)
1943 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
1944 if (res != NULL) {
1945 assert(res == linear_search(this, pc_offset, approximate), "cache ok");
1946 return res;
1947 }
1948
1949 // Fallback algorithm: quasi-linear search for the PcDesc
1950 // Find the last pc_offset less than the given offset.
1951 // The successor must be the required match, if there is a match at all.
1952 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
1953 PcDesc* lower = scopes_pcs_begin();
1954 PcDesc* upper = scopes_pcs_end();
1955 upper -= 1; // exclude final sentinel
1956 if (lower >= upper) return NULL; // native method; no PcDescs at all
1957
1958 #define assert_LU_OK \
1959 /* invariant on lower..upper during the following search: */ \
1960 assert(lower->pc_offset() < pc_offset, "sanity"); \
1961 assert(upper->pc_offset() >= pc_offset, "sanity")
1962 assert_LU_OK;
1963
1964 // Use the last successful return as a split point.
1965 PcDesc* mid = _pc_desc_cache.last_pc_desc();
1966 NOT_PRODUCT(++nmethod_stats.pc_desc_searches);
1967 if (mid->pc_offset() < pc_offset) {
1968 lower = mid;
1969 } else {
1970 upper = mid;
1971 }
1972
1973 // Take giant steps at first (4096, then 256, then 16, then 1)
1974 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
1975 const int RADIX = (1 << LOG2_RADIX);
1976 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
1977 while ((mid = lower + step) < upper) {
1978 assert_LU_OK;
1979 NOT_PRODUCT(++nmethod_stats.pc_desc_searches);
1980 if (mid->pc_offset() < pc_offset) {
1981 lower = mid;
1982 } else {
1983 upper = mid;
1984 break;
1985 }
1986 }
1987 assert_LU_OK;
1988 }
1989
1990 // Sneak up on the value with a linear search of length ~16.
1991 while (true) {
1992 assert_LU_OK;
1993 mid = lower + 1;
1994 NOT_PRODUCT(++nmethod_stats.pc_desc_searches);
1995 if (mid->pc_offset() < pc_offset) {
1996 lower = mid;
1997 } else {
1998 upper = mid;
1999 break;
2000 }
2001 }
2002 #undef assert_LU_OK
2003
2004 if (match_desc(upper, pc_offset, approximate)) {
2005 assert(upper == linear_search(this, pc_offset, approximate), "search ok");
2006 _pc_desc_cache.add_pc_desc(upper);
2007 return upper;
2008 } else {
2009 assert(NULL == linear_search(this, pc_offset, approximate), "search ok");
2010 return NULL;
2011 }
2012 }
2013
2014
2015 bool nmethod::check_all_dependencies() {
2016 bool found_check = false;
2017 // wholesale check of all dependencies
2018 for (Dependencies::DepStream deps(this); deps.next(); ) {
2019 if (deps.check_dependency() != NULL) {
2020 found_check = true;
2021 NOT_DEBUG(break);
2022 }
2023 }
2024 return found_check; // tell caller if we found anything
2025 }
2026
2027 bool nmethod::check_dependency_on(DepChange& changes) {
2028 // What has happened:
2029 // 1) a new class dependee has been added
2030 // 2) dependee and all its super classes have been marked
2031 bool found_check = false; // set true if we are upset
2032 for (Dependencies::DepStream deps(this); deps.next(); ) {
2033 // Evaluate only relevant dependencies.
2034 if (deps.spot_check_dependency_at(changes) != NULL) {
2035 found_check = true;
2036 NOT_DEBUG(break);
2037 }
2038 }
2039 return found_check;
2040 }
2041
2042 bool nmethod::is_evol_dependent_on(klassOop dependee) {
2043 instanceKlass *dependee_ik = instanceKlass::cast(dependee);
2044 objArrayOop dependee_methods = dependee_ik->methods();
2045 for (Dependencies::DepStream deps(this); deps.next(); ) {
2046 if (deps.type() == Dependencies::evol_method) {
2047 methodOop method = deps.method_argument(0);
2048 for (int j = 0; j < dependee_methods->length(); j++) {
2049 if ((methodOop) dependee_methods->obj_at(j) == method) {
2050 // RC_TRACE macro has an embedded ResourceMark
2051 RC_TRACE(0x01000000,
2052 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)",
2053 _method->method_holder()->klass_part()->external_name(),
2054 _method->name()->as_C_string(),
2055 _method->signature()->as_C_string(), compile_id(),
2056 method->method_holder()->klass_part()->external_name(),
2057 method->name()->as_C_string(),
2058 method->signature()->as_C_string()));
2059 if (TraceDependencies || LogCompilation)
2060 deps.log_dependency(dependee);
2061 return true;
2062 }
2063 }
2064 }
2065 }
2066 return false;
2067 }
2068
2069 // Called from mark_for_deoptimization, when dependee is invalidated.
2070 bool nmethod::is_dependent_on_method(methodOop dependee) {
2071 for (Dependencies::DepStream deps(this); deps.next(); ) {
2072 if (deps.type() != Dependencies::evol_method)
2073 continue;
2074 methodOop method = deps.method_argument(0);
2075 if (method == dependee) return true;
2076 }
2077 return false;
2078 }
2079
2080
2081 bool nmethod::is_patchable_at(address instr_addr) {
2082 assert(insts_contains(instr_addr), "wrong nmethod used");
2083 if (is_zombie()) {
2084 // a zombie may never be patched
2085 return false;
2086 }
2087 return true;
2088 }
2089
2090
2091 address nmethod::continuation_for_implicit_exception(address pc) {
2092 // Exception happened outside inline-cache check code => we are inside
2093 // an active nmethod => use cpc to determine a return address
2094 int exception_offset = pc - code_begin();
2095 int cont_offset = ImplicitExceptionTable(this).at( exception_offset );
2096 #ifdef ASSERT
2097 if (cont_offset == 0) {
2098 Thread* thread = ThreadLocalStorage::get_thread_slow();
2099 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
2100 HandleMark hm(thread);
2101 ResourceMark rm(thread);
2102 CodeBlob* cb = CodeCache::find_blob(pc);
2103 assert(cb != NULL && cb == this, "");
2104 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, pc);
2105 print();
2106 method()->print_codes();
2107 print_code();
2108 print_pcs();
2109 }
2110 #endif
2111 if (cont_offset == 0) {
2112 // Let the normal error handling report the exception
2113 return NULL;
2114 }
2115 return code_begin() + cont_offset;
2116 }
2117
2118
2119
2120 void nmethod_init() {
2121 // make sure you didn't forget to adjust the filler fields
2122 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
2123 }
2124
2125
2126 //-------------------------------------------------------------------------------------------
2127
2128
2129 // QQQ might we make this work from a frame??
2130 nmethodLocker::nmethodLocker(address pc) {
2131 CodeBlob* cb = CodeCache::find_blob(pc);
2132 guarantee(cb != NULL && cb->is_nmethod(), "bad pc for a nmethod found");
2133 _nm = (nmethod*)cb;
2134 lock_nmethod(_nm);
2135 }
2136
2137 // Only JvmtiDeferredEvent::compiled_method_unload_event()
2138 // should pass zombie_ok == true.
2139 void nmethodLocker::lock_nmethod(nmethod* nm, bool zombie_ok) {
2140 if (nm == NULL) return;
2141 Atomic::inc(&nm->_lock_count);
2142 guarantee(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method");
2143 }
2144
2145 void nmethodLocker::unlock_nmethod(nmethod* nm) {
2146 if (nm == NULL) return;
2147 Atomic::dec(&nm->_lock_count);
2148 guarantee(nm->_lock_count >= 0, "unmatched nmethod lock/unlock");
2149 }
2150
2151
2152 // -----------------------------------------------------------------------------
2153 // nmethod::get_deopt_original_pc
2154 //
2155 // Return the original PC for the given PC if:
2156 // (a) the given PC belongs to a nmethod and
2157 // (b) it is a deopt PC
2158 address nmethod::get_deopt_original_pc(const frame* fr) {
2159 if (fr->cb() == NULL) return NULL;
2160
2161 nmethod* nm = fr->cb()->as_nmethod_or_null();
2162 if (nm != NULL && nm->is_deopt_pc(fr->pc()))
2163 return nm->get_original_pc(fr);
2164
2165 return NULL;
2166 }
2167
2168
2169 // -----------------------------------------------------------------------------
2170 // MethodHandle
2171
2172 bool nmethod::is_method_handle_return(address return_pc) {
2173 if (!has_method_handle_invokes()) return false;
2174 PcDesc* pd = pc_desc_at(return_pc);
2175 if (pd == NULL)
2176 return false;
2177 return pd->is_method_handle_invoke();
2178 }
2179
2180
2181 // -----------------------------------------------------------------------------
2182 // Verification
2183
2184 class VerifyOopsClosure: public OopClosure {
2185 nmethod* _nm;
2186 bool _ok;
2187 public:
2188 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
2189 bool ok() { return _ok; }
2190 virtual void do_oop(oop* p) {
2191 if ((*p) == NULL || (*p)->is_oop()) return;
2192 if (_ok) {
2193 _nm->print_nmethod(true);
2194 _ok = false;
2195 }
2196 tty->print_cr("*** non-oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)",
2197 (intptr_t)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm));
2198 }
2199 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2200 };
2201
2202 void nmethod::verify() {
2203
2204 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant
2205 // seems odd.
2206
2207 if( is_zombie() || is_not_entrant() )
2208 return;
2209
2210 // Make sure all the entry points are correctly aligned for patching.
2211 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
2212
2213 assert(method()->is_oop(), "must be valid");
2214
2215 ResourceMark rm;
2216
2217 if (!CodeCache::contains(this)) {
2218 fatal(err_msg("nmethod at " INTPTR_FORMAT " not in zone", this));
2219 }
2220
2221 if(is_native_method() )
2222 return;
2223
2224 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
2225 if (nm != this) {
2226 fatal(err_msg("findNMethod did not find this nmethod (" INTPTR_FORMAT ")",
2227 this));
2228 }
2229
2230 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2231 if (! p->verify(this)) {
2232 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", this);
2233 }
2234 }
2235
2236 VerifyOopsClosure voc(this);
2237 oops_do(&voc);
2238 assert(voc.ok(), "embedded oops must be OK");
2239 verify_scavenge_root_oops();
2240
2241 verify_scopes();
2242 }
2243
2244
2245 void nmethod::verify_interrupt_point(address call_site) {
2246 // This code does not work in release mode since
2247 // owns_lock only is available in debug mode.
2248 CompiledIC* ic = NULL;
2249 Thread *cur = Thread::current();
2250 if (CompiledIC_lock->owner() == cur ||
2251 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) &&
2252 SafepointSynchronize::is_at_safepoint())) {
2253 ic = CompiledIC_at(call_site);
2254 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
2255 } else {
2256 MutexLocker ml_verify (CompiledIC_lock);
2257 ic = CompiledIC_at(call_site);
2258 }
2259 PcDesc* pd = pc_desc_at(ic->end_of_call());
2260 assert(pd != NULL, "PcDesc must exist");
2261 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(),
2262 pd->obj_decode_offset(), pd->should_reexecute(),
2263 pd->return_oop());
2264 !sd->is_top(); sd = sd->sender()) {
2265 sd->verify();
2266 }
2267 }
2268
2269 void nmethod::verify_scopes() {
2270 if( !method() ) return; // Runtime stubs have no scope
2271 if (method()->is_native()) return; // Ignore stub methods.
2272 // iterate through all interrupt point
2273 // and verify the debug information is valid.
2274 RelocIterator iter((nmethod*)this);
2275 while (iter.next()) {
2276 address stub = NULL;
2277 switch (iter.type()) {
2278 case relocInfo::virtual_call_type:
2279 verify_interrupt_point(iter.addr());
2280 break;
2281 case relocInfo::opt_virtual_call_type:
2282 stub = iter.opt_virtual_call_reloc()->static_stub();
2283 verify_interrupt_point(iter.addr());
2284 break;
2285 case relocInfo::static_call_type:
2286 stub = iter.static_call_reloc()->static_stub();
2287 //verify_interrupt_point(iter.addr());
2288 break;
2289 case relocInfo::runtime_call_type:
2290 address destination = iter.reloc()->value();
2291 // Right now there is no way to find out which entries support
2292 // an interrupt point. It would be nice if we had this
2293 // information in a table.
2294 break;
2295 }
2296 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section");
2297 }
2298 }
2299
2300
2301 // -----------------------------------------------------------------------------
2302 // Non-product code
2303 #ifndef PRODUCT
2304
2305 class DebugScavengeRoot: public OopClosure {
2306 nmethod* _nm;
2307 bool _ok;
2308 public:
2309 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { }
2310 bool ok() { return _ok; }
2311 virtual void do_oop(oop* p) {
2312 if ((*p) == NULL || !(*p)->is_scavengable()) return;
2313 if (_ok) {
2314 _nm->print_nmethod(true);
2315 _ok = false;
2316 }
2317 tty->print_cr("*** scavengable oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)",
2318 (intptr_t)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm));
2319 (*p)->print();
2320 }
2321 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2322 };
2323
2324 void nmethod::verify_scavenge_root_oops() {
2325 if (!on_scavenge_root_list()) {
2326 // Actually look inside, to verify the claim that it's clean.
2327 DebugScavengeRoot debug_scavenge_root(this);
2328 oops_do(&debug_scavenge_root);
2329 if (!debug_scavenge_root.ok())
2330 fatal("found an unadvertised bad scavengable oop in the code cache");
2331 }
2332 assert(scavenge_root_not_marked(), "");
2333 }
2334
2335 #endif // PRODUCT
2336
2337 // Printing operations
2338
2339 void nmethod::print() const {
2340 ResourceMark rm;
2341 ttyLocker ttyl; // keep the following output all in one block
2342
2343 tty->print("Compiled method ");
2344
2345 if (is_compiled_by_c1()) {
2346 tty->print("(c1) ");
2347 } else if (is_compiled_by_c2()) {
2348 tty->print("(c2) ");
2349 } else if (is_compiled_by_shark()) {
2350 tty->print("(shark) ");
2351 } else {
2352 tty->print("(nm) ");
2353 }
2354
2355 print_on(tty, NULL);
2356
2357 if (WizardMode) {
2358 tty->print("((nmethod*) "INTPTR_FORMAT ") ", this);
2359 tty->print(" for method " INTPTR_FORMAT , (address)method());
2360 tty->print(" { ");
2361 if (is_in_use()) tty->print("in_use ");
2362 if (is_not_entrant()) tty->print("not_entrant ");
2363 if (is_zombie()) tty->print("zombie ");
2364 if (is_unloaded()) tty->print("unloaded ");
2365 if (on_scavenge_root_list()) tty->print("scavenge_root ");
2366 tty->print_cr("}:");
2367 }
2368 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2369 (address)this,
2370 (address)this + size(),
2371 size());
2372 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2373 relocation_begin(),
2374 relocation_end(),
2375 relocation_size());
2376 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2377 consts_begin(),
2378 consts_end(),
2379 consts_size());
2380 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2381 insts_begin(),
2382 insts_end(),
2383 insts_size());
2384 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2385 stub_begin(),
2386 stub_end(),
2387 stub_size());
2388 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2389 oops_begin(),
2390 oops_end(),
2391 oops_size());
2392 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2393 scopes_data_begin(),
2394 scopes_data_end(),
2395 scopes_data_size());
2396 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2397 scopes_pcs_begin(),
2398 scopes_pcs_end(),
2399 scopes_pcs_size());
2400 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2401 dependencies_begin(),
2402 dependencies_end(),
2403 dependencies_size());
2404 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2405 handler_table_begin(),
2406 handler_table_end(),
2407 handler_table_size());
2408 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2409 nul_chk_table_begin(),
2410 nul_chk_table_end(),
2411 nul_chk_table_size());
2412 }
2413
2414 void nmethod::print_code() {
2415 HandleMark hm;
2416 ResourceMark m;
2417 Disassembler::decode(this);
2418 }
2419
2420
2421 #ifndef PRODUCT
2422
2423 void nmethod::print_scopes() {
2424 // Find the first pc desc for all scopes in the code and print it.
2425 ResourceMark rm;
2426 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2427 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
2428 continue;
2429
2430 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
2431 sd->print_on(tty, p);
2432 }
2433 }
2434
2435 void nmethod::print_dependencies() {
2436 ResourceMark rm;
2437 ttyLocker ttyl; // keep the following output all in one block
2438 tty->print_cr("Dependencies:");
2439 for (Dependencies::DepStream deps(this); deps.next(); ) {
2440 deps.print_dependency();
2441 klassOop ctxk = deps.context_type();
2442 if (ctxk != NULL) {
2443 Klass* k = Klass::cast(ctxk);
2444 if (k->oop_is_instance() && ((instanceKlass*)k)->is_dependent_nmethod(this)) {
2445 tty->print_cr(" [nmethod<=klass]%s", k->external_name());
2446 }
2447 }
2448 deps.log_dependency(); // put it into the xml log also
2449 }
2450 }
2451
2452
2453 void nmethod::print_relocations() {
2454 ResourceMark m; // in case methods get printed via the debugger
2455 tty->print_cr("relocations:");
2456 RelocIterator iter(this);
2457 iter.print();
2458 if (UseRelocIndex) {
2459 jint* index_end = (jint*)relocation_end() - 1;
2460 jint index_size = *index_end;
2461 jint* index_start = (jint*)( (address)index_end - index_size );
2462 tty->print_cr(" index @" INTPTR_FORMAT ": index_size=%d", index_start, index_size);
2463 if (index_size > 0) {
2464 jint* ip;
2465 for (ip = index_start; ip+2 <= index_end; ip += 2)
2466 tty->print_cr(" (%d %d) addr=" INTPTR_FORMAT " @" INTPTR_FORMAT,
2467 ip[0],
2468 ip[1],
2469 header_end()+ip[0],
2470 relocation_begin()-1+ip[1]);
2471 for (; ip < index_end; ip++)
2472 tty->print_cr(" (%d ?)", ip[0]);
2473 tty->print_cr(" @" INTPTR_FORMAT ": index_size=%d", ip, *ip++);
2474 tty->print_cr("reloc_end @" INTPTR_FORMAT ":", ip);
2475 }
2476 }
2477 }
2478
2479
2480 void nmethod::print_pcs() {
2481 ResourceMark m; // in case methods get printed via debugger
2482 tty->print_cr("pc-bytecode offsets:");
2483 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2484 p->print(this);
2485 }
2486 }
2487
2488 #endif // PRODUCT
2489
2490 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
2491 RelocIterator iter(this, begin, end);
2492 bool have_one = false;
2493 while (iter.next()) {
2494 have_one = true;
2495 switch (iter.type()) {
2496 case relocInfo::none: return "no_reloc";
2497 case relocInfo::oop_type: {
2498 stringStream st;
2499 oop_Relocation* r = iter.oop_reloc();
2500 oop obj = r->oop_value();
2501 st.print("oop(");
2502 if (obj == NULL) st.print("NULL");
2503 else obj->print_value_on(&st);
2504 st.print(")");
2505 return st.as_string();
2506 }
2507 case relocInfo::virtual_call_type: return "virtual_call";
2508 case relocInfo::opt_virtual_call_type: return "optimized virtual_call";
2509 case relocInfo::static_call_type: return "static_call";
2510 case relocInfo::static_stub_type: return "static_stub";
2511 case relocInfo::runtime_call_type: return "runtime_call";
2512 case relocInfo::external_word_type: return "external_word";
2513 case relocInfo::internal_word_type: return "internal_word";
2514 case relocInfo::section_word_type: return "section_word";
2515 case relocInfo::poll_type: return "poll";
2516 case relocInfo::poll_return_type: return "poll_return";
2517 case relocInfo::type_mask: return "type_bit_mask";
2518 }
2519 }
2520 return have_one ? "other" : NULL;
2521 }
2522
2523 // Return a the last scope in (begin..end]
2524 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
2525 PcDesc* p = pc_desc_near(begin+1);
2526 if (p != NULL && p->real_pc(this) <= end) {
2527 return new ScopeDesc(this, p->scope_decode_offset(),
2528 p->obj_decode_offset(), p->should_reexecute(),
2529 p->return_oop());
2530 }
2531 return NULL;
2532 }
2533
2534 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) {
2535 if (block_begin == entry_point()) stream->print_cr("[Entry Point]");
2536 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]");
2537 if (block_begin == exception_begin()) stream->print_cr("[Exception Handler]");
2538 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]");
2539 if (block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]");
2540
2541 if (has_method_handle_invokes())
2542 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]");
2543
2544 if (block_begin == consts_begin()) stream->print_cr("[Constants]");
2545
2546 if (block_begin == entry_point()) {
2547 methodHandle m = method();
2548 if (m.not_null()) {
2549 stream->print(" # ");
2550 m->print_value_on(stream);
2551 stream->cr();
2552 }
2553 if (m.not_null() && !is_osr_method()) {
2554 ResourceMark rm;
2555 int sizeargs = m->size_of_parameters();
2556 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
2557 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
2558 {
2559 int sig_index = 0;
2560 if (!m->is_static())
2561 sig_bt[sig_index++] = T_OBJECT; // 'this'
2562 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) {
2563 BasicType t = ss.type();
2564 sig_bt[sig_index++] = t;
2565 if (type2size[t] == 2) {
2566 sig_bt[sig_index++] = T_VOID;
2567 } else {
2568 assert(type2size[t] == 1, "size is 1 or 2");
2569 }
2570 }
2571 assert(sig_index == sizeargs, "");
2572 }
2573 const char* spname = "sp"; // make arch-specific?
2574 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false);
2575 int stack_slot_offset = this->frame_size() * wordSize;
2576 int tab1 = 14, tab2 = 24;
2577 int sig_index = 0;
2578 int arg_index = (m->is_static() ? 0 : -1);
2579 bool did_old_sp = false;
2580 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) {
2581 bool at_this = (arg_index == -1);
2582 bool at_old_sp = false;
2583 BasicType t = (at_this ? T_OBJECT : ss.type());
2584 assert(t == sig_bt[sig_index], "sigs in sync");
2585 if (at_this)
2586 stream->print(" # this: ");
2587 else
2588 stream->print(" # parm%d: ", arg_index);
2589 stream->move_to(tab1);
2590 VMReg fst = regs[sig_index].first();
2591 VMReg snd = regs[sig_index].second();
2592 if (fst->is_reg()) {
2593 stream->print("%s", fst->name());
2594 if (snd->is_valid()) {
2595 stream->print(":%s", snd->name());
2596 }
2597 } else if (fst->is_stack()) {
2598 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
2599 if (offset == stack_slot_offset) at_old_sp = true;
2600 stream->print("[%s+0x%x]", spname, offset);
2601 } else {
2602 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
2603 }
2604 stream->print(" ");
2605 stream->move_to(tab2);
2606 stream->print("= ");
2607 if (at_this) {
2608 m->method_holder()->print_value_on(stream);
2609 } else {
2610 bool did_name = false;
2611 if (!at_this && ss.is_object()) {
2612 Symbol* name = ss.as_symbol_or_null();
2613 if (name != NULL) {
2614 name->print_value_on(stream);
2615 did_name = true;
2616 }
2617 }
2618 if (!did_name)
2619 stream->print("%s", type2name(t));
2620 }
2621 if (at_old_sp) {
2622 stream->print(" (%s of caller)", spname);
2623 did_old_sp = true;
2624 }
2625 stream->cr();
2626 sig_index += type2size[t];
2627 arg_index += 1;
2628 if (!at_this) ss.next();
2629 }
2630 if (!did_old_sp) {
2631 stream->print(" # ");
2632 stream->move_to(tab1);
2633 stream->print("[%s+0x%x]", spname, stack_slot_offset);
2634 stream->print(" (%s of caller)", spname);
2635 stream->cr();
2636 }
2637 }
2638 }
2639 }
2640
2641 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) {
2642 // First, find an oopmap in (begin, end].
2643 // We use the odd half-closed interval so that oop maps and scope descs
2644 // which are tied to the byte after a call are printed with the call itself.
2645 address base = code_begin();
2646 OopMapSet* oms = oop_maps();
2647 if (oms != NULL) {
2648 for (int i = 0, imax = oms->size(); i < imax; i++) {
2649 OopMap* om = oms->at(i);
2650 address pc = base + om->offset();
2651 if (pc > begin) {
2652 if (pc <= end) {
2653 st->move_to(column);
2654 st->print("; ");
2655 om->print_on(st);
2656 }
2657 break;
2658 }
2659 }
2660 }
2661
2662 // Print any debug info present at this pc.
2663 ScopeDesc* sd = scope_desc_in(begin, end);
2664 if (sd != NULL) {
2665 st->move_to(column);
2666 if (sd->bci() == SynchronizationEntryBCI) {
2667 st->print(";*synchronization entry");
2668 } else {
2669 if (sd->method().is_null()) {
2670 st->print("method is NULL");
2671 } else if (sd->method()->is_native()) {
2672 st->print("method is native");
2673 } else {
2674 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci());
2675 st->print(";*%s", Bytecodes::name(bc));
2676 switch (bc) {
2677 case Bytecodes::_invokevirtual:
2678 case Bytecodes::_invokespecial:
2679 case Bytecodes::_invokestatic:
2680 case Bytecodes::_invokeinterface:
2681 {
2682 Bytecode_invoke invoke(sd->method(), sd->bci());
2683 st->print(" ");
2684 if (invoke.name() != NULL)
2685 invoke.name()->print_symbol_on(st);
2686 else
2687 st->print("<UNKNOWN>");
2688 break;
2689 }
2690 case Bytecodes::_getfield:
2691 case Bytecodes::_putfield:
2692 case Bytecodes::_getstatic:
2693 case Bytecodes::_putstatic:
2694 {
2695 Bytecode_field field(sd->method(), sd->bci());
2696 st->print(" ");
2697 if (field.name() != NULL)
2698 field.name()->print_symbol_on(st);
2699 else
2700 st->print("<UNKNOWN>");
2701 }
2702 }
2703 }
2704 }
2705
2706 // Print all scopes
2707 for (;sd != NULL; sd = sd->sender()) {
2708 st->move_to(column);
2709 st->print("; -");
2710 if (sd->method().is_null()) {
2711 st->print("method is NULL");
2712 } else {
2713 sd->method()->print_short_name(st);
2714 }
2715 int lineno = sd->method()->line_number_from_bci(sd->bci());
2716 if (lineno != -1) {
2717 st->print("@%d (line %d)", sd->bci(), lineno);
2718 } else {
2719 st->print("@%d", sd->bci());
2720 }
2721 st->cr();
2722 }
2723 }
2724
2725 // Print relocation information
2726 const char* str = reloc_string_for(begin, end);
2727 if (str != NULL) {
2728 if (sd != NULL) st->cr();
2729 st->move_to(column);
2730 st->print("; {%s}", str);
2731 }
2732 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin());
2733 if (cont_offset != 0) {
2734 st->move_to(column);
2735 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, code_begin() + cont_offset);
2736 }
2737
2738 }
2739
2740 #ifndef PRODUCT
2741
2742 void nmethod::print_value_on(outputStream* st) const {
2743 st->print("nmethod");
2744 print_on(st, NULL);
2745 }
2746
2747 void nmethod::print_calls(outputStream* st) {
2748 RelocIterator iter(this);
2749 while (iter.next()) {
2750 switch (iter.type()) {
2751 case relocInfo::virtual_call_type:
2752 case relocInfo::opt_virtual_call_type: {
2753 VerifyMutexLocker mc(CompiledIC_lock);
2754 CompiledIC_at(iter.reloc())->print();
2755 break;
2756 }
2757 case relocInfo::static_call_type:
2758 st->print_cr("Static call at " INTPTR_FORMAT, iter.reloc()->addr());
2759 compiledStaticCall_at(iter.reloc())->print();
2760 break;
2761 }
2762 }
2763 }
2764
2765 void nmethod::print_handler_table() {
2766 ExceptionHandlerTable(this).print();
2767 }
2768
2769 void nmethod::print_nul_chk_table() {
2770 ImplicitExceptionTable(this).print(code_begin());
2771 }
2772
2773 void nmethod::print_statistics() {
2774 ttyLocker ttyl;
2775 if (xtty != NULL) xtty->head("statistics type='nmethod'");
2776 nmethod_stats.print_native_nmethod_stats();
2777 nmethod_stats.print_nmethod_stats();
2778 DebugInformationRecorder::print_statistics();
2779 nmethod_stats.print_pc_stats();
2780 Dependencies::print_statistics();
2781 if (xtty != NULL) xtty->tail("statistics");
2782 }
2783
2784 #endif // PRODUCT