1 /*
2 * Copyright (c) 1997, 2014, 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/methodData.hpp"
38 #include "prims/jvmtiRedefineClassesTrace.hpp"
39 #include "prims/jvmtiImpl.hpp"
40 #include "runtime/atomic.inline.hpp"
41 #include "runtime/orderAccess.inline.hpp"
42 #include "runtime/sharedRuntime.hpp"
43 #include "runtime/sweeper.hpp"
44 #include "utilities/resourceHash.hpp"
45 #include "utilities/dtrace.hpp"
46 #include "utilities/events.hpp"
47 #include "utilities/xmlstream.hpp"
48 #ifdef SHARK
49 #include "shark/sharkCompiler.hpp"
50 #endif
51
52 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
53
54 unsigned char nmethod::_global_unloading_clock = 0;
55
56 #ifdef DTRACE_ENABLED
57
58 // Only bother with this argument setup if dtrace is available
59
60 #define DTRACE_METHOD_UNLOAD_PROBE(method) \
61 { \
62 Method* m = (method); \
63 if (m != NULL) { \
64 Symbol* klass_name = m->klass_name(); \
65 Symbol* name = m->name(); \
66 Symbol* signature = m->signature(); \
67 HOTSPOT_COMPILED_METHOD_UNLOAD( \
68 (char *) klass_name->bytes(), klass_name->utf8_length(), \
69 (char *) name->bytes(), name->utf8_length(), \
70 (char *) signature->bytes(), signature->utf8_length()); \
71 } \
72 }
73
74 #else // ndef DTRACE_ENABLED
75
76 #define DTRACE_METHOD_UNLOAD_PROBE(method)
77
78 #endif
79
80 bool nmethod::is_compiled_by_c1() const {
81 if (compiler() == NULL) {
82 return false;
83 }
84 return compiler()->is_c1();
85 }
86 bool nmethod::is_compiled_by_c2() const {
87 if (compiler() == NULL) {
88 return false;
89 }
90 return compiler()->is_c2();
91 }
92 bool nmethod::is_compiled_by_shark() const {
93 if (compiler() == NULL) {
94 return false;
95 }
96 return compiler()->is_shark();
97 }
98
99
100
101 //---------------------------------------------------------------------------------
102 // NMethod statistics
103 // They are printed under various flags, including:
104 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation.
105 // (In the latter two cases, they like other stats are printed to the log only.)
106
107 #ifndef PRODUCT
108 // These variables are put into one block to reduce relocations
109 // and make it simpler to print from the debugger.
110 static
111 struct nmethod_stats_struct {
112 int nmethod_count;
113 int total_size;
114 int relocation_size;
115 int consts_size;
116 int insts_size;
117 int stub_size;
118 int scopes_data_size;
119 int scopes_pcs_size;
120 int dependencies_size;
121 int handler_table_size;
122 int nul_chk_table_size;
123 int oops_size;
124
125 void note_nmethod(nmethod* nm) {
126 nmethod_count += 1;
127 total_size += nm->size();
128 relocation_size += nm->relocation_size();
129 consts_size += nm->consts_size();
130 insts_size += nm->insts_size();
131 stub_size += nm->stub_size();
132 oops_size += nm->oops_size();
133 scopes_data_size += nm->scopes_data_size();
134 scopes_pcs_size += nm->scopes_pcs_size();
135 dependencies_size += nm->dependencies_size();
136 handler_table_size += nm->handler_table_size();
137 nul_chk_table_size += nm->nul_chk_table_size();
138 }
139 void print_nmethod_stats() {
140 if (nmethod_count == 0) return;
141 tty->print_cr("Statistics for %d bytecoded nmethods:", nmethod_count);
142 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size);
143 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size);
144 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size);
145 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size);
146 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size);
147 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size);
148 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size);
149 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size);
150 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size);
151 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size);
152 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size);
153 }
154
155 int native_nmethod_count;
156 int native_total_size;
157 int native_relocation_size;
158 int native_insts_size;
159 int native_oops_size;
160 void note_native_nmethod(nmethod* nm) {
161 native_nmethod_count += 1;
162 native_total_size += nm->size();
163 native_relocation_size += nm->relocation_size();
164 native_insts_size += nm->insts_size();
165 native_oops_size += nm->oops_size();
166 }
167 void print_native_nmethod_stats() {
168 if (native_nmethod_count == 0) return;
169 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count);
170 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size);
171 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size);
172 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size);
173 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size);
174 }
175
176 int pc_desc_resets; // number of resets (= number of caches)
177 int pc_desc_queries; // queries to nmethod::find_pc_desc
178 int pc_desc_approx; // number of those which have approximate true
179 int pc_desc_repeats; // number of _pc_descs[0] hits
180 int pc_desc_hits; // number of LRU cache hits
181 int pc_desc_tests; // total number of PcDesc examinations
182 int pc_desc_searches; // total number of quasi-binary search steps
183 int pc_desc_adds; // number of LUR cache insertions
184
185 void print_pc_stats() {
186 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query",
187 pc_desc_queries,
188 (double)(pc_desc_tests + pc_desc_searches)
189 / pc_desc_queries);
190 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d",
191 pc_desc_resets,
192 pc_desc_queries, pc_desc_approx,
193 pc_desc_repeats, pc_desc_hits,
194 pc_desc_tests, pc_desc_searches, pc_desc_adds);
195 }
196 } nmethod_stats;
197 #endif //PRODUCT
198
199
200 //---------------------------------------------------------------------------------
201
202
203 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) {
204 assert(pc != NULL, "Must be non null");
205 assert(exception.not_null(), "Must be non null");
206 assert(handler != NULL, "Must be non null");
207
208 _count = 0;
209 _exception_type = exception->klass();
210 _next = NULL;
211
212 add_address_and_handler(pc,handler);
213 }
214
215
216 address ExceptionCache::match(Handle exception, address pc) {
217 assert(pc != NULL,"Must be non null");
218 assert(exception.not_null(),"Must be non null");
219 if (exception->klass() == exception_type()) {
220 return (test_address(pc));
221 }
222
223 return NULL;
224 }
225
226
227 bool ExceptionCache::match_exception_with_space(Handle exception) {
228 assert(exception.not_null(),"Must be non null");
229 if (exception->klass() == exception_type() && count() < cache_size) {
230 return true;
231 }
232 return false;
233 }
234
235
236 address ExceptionCache::test_address(address addr) {
237 for (int i=0; i<count(); i++) {
238 if (pc_at(i) == addr) {
239 return handler_at(i);
240 }
241 }
242 return NULL;
243 }
244
245
246 bool ExceptionCache::add_address_and_handler(address addr, address handler) {
247 if (test_address(addr) == handler) return true;
248 if (count() < cache_size) {
249 set_pc_at(count(),addr);
250 set_handler_at(count(), handler);
251 increment_count();
252 return true;
253 }
254 return false;
255 }
256
257
258 // private method for handling exception cache
259 // These methods are private, and used to manipulate the exception cache
260 // directly.
261 ExceptionCache* nmethod::exception_cache_entry_for_exception(Handle exception) {
262 ExceptionCache* ec = exception_cache();
263 while (ec != NULL) {
264 if (ec->match_exception_with_space(exception)) {
265 return ec;
266 }
267 ec = ec->next();
268 }
269 return NULL;
270 }
271
272
273 //-----------------------------------------------------------------------------
274
275
276 // Helper used by both find_pc_desc methods.
277 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) {
278 NOT_PRODUCT(++nmethod_stats.pc_desc_tests);
279 if (!approximate)
280 return pc->pc_offset() == pc_offset;
281 else
282 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset();
283 }
284
285 void PcDescCache::reset_to(PcDesc* initial_pc_desc) {
286 if (initial_pc_desc == NULL) {
287 _pc_descs[0] = NULL; // native method; no PcDescs at all
288 return;
289 }
290 NOT_PRODUCT(++nmethod_stats.pc_desc_resets);
291 // reset the cache by filling it with benign (non-null) values
292 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel");
293 for (int i = 0; i < cache_size; i++)
294 _pc_descs[i] = initial_pc_desc;
295 }
296
297 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) {
298 NOT_PRODUCT(++nmethod_stats.pc_desc_queries);
299 NOT_PRODUCT(if (approximate) ++nmethod_stats.pc_desc_approx);
300
301 // Note: one might think that caching the most recently
302 // read value separately would be a win, but one would be
303 // wrong. When many threads are updating it, the cache
304 // line it's in would bounce between caches, negating
305 // any benefit.
306
307 // In order to prevent race conditions do not load cache elements
308 // repeatedly, but use a local copy:
309 PcDesc* res;
310
311 // Step one: Check the most recently added value.
312 res = _pc_descs[0];
313 if (res == NULL) return NULL; // native method; no PcDescs at all
314 if (match_desc(res, pc_offset, approximate)) {
315 NOT_PRODUCT(++nmethod_stats.pc_desc_repeats);
316 return res;
317 }
318
319 // Step two: Check the rest of the LRU cache.
320 for (int i = 1; i < cache_size; ++i) {
321 res = _pc_descs[i];
322 if (res->pc_offset() < 0) break; // optimization: skip empty cache
323 if (match_desc(res, pc_offset, approximate)) {
324 NOT_PRODUCT(++nmethod_stats.pc_desc_hits);
325 return res;
326 }
327 }
328
329 // Report failure.
330 return NULL;
331 }
332
333 void PcDescCache::add_pc_desc(PcDesc* pc_desc) {
334 NOT_PRODUCT(++nmethod_stats.pc_desc_adds);
335 // Update the LRU cache by shifting pc_desc forward.
336 for (int i = 0; i < cache_size; i++) {
337 PcDesc* next = _pc_descs[i];
338 _pc_descs[i] = pc_desc;
339 pc_desc = next;
340 }
341 }
342
343 // adjust pcs_size so that it is a multiple of both oopSize and
344 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple
345 // of oopSize, then 2*sizeof(PcDesc) is)
346 static int adjust_pcs_size(int pcs_size) {
347 int nsize = round_to(pcs_size, oopSize);
348 if ((nsize % sizeof(PcDesc)) != 0) {
349 nsize = pcs_size + sizeof(PcDesc);
350 }
351 assert((nsize % oopSize) == 0, "correct alignment");
352 return nsize;
353 }
354
355 //-----------------------------------------------------------------------------
356
357
358 void nmethod::add_exception_cache_entry(ExceptionCache* new_entry) {
359 assert(ExceptionCache_lock->owned_by_self(),"Must hold the ExceptionCache_lock");
360 assert(new_entry != NULL,"Must be non null");
361 assert(new_entry->next() == NULL, "Must be null");
362
363 if (exception_cache() != NULL) {
364 new_entry->set_next(exception_cache());
365 }
366 set_exception_cache(new_entry);
367 }
368
369 void nmethod::clean_exception_cache(BoolObjectClosure* is_alive) {
370 ExceptionCache* prev = NULL;
371 ExceptionCache* curr = exception_cache();
372
373 while (curr != NULL) {
374 ExceptionCache* next = curr->next();
375
376 Klass* ex_klass = curr->exception_type();
377 if (ex_klass != NULL && !ex_klass->is_loader_alive(is_alive)) {
378 if (prev == NULL) {
379 set_exception_cache(next);
380 } else {
381 prev->set_next(next);
382 }
383 delete curr;
384 // prev stays the same.
385 } else {
386 prev = curr;
387 }
388
389 curr = next;
390 }
391 }
392
393 // public method for accessing the exception cache
394 // These are the public access methods.
395 address nmethod::handler_for_exception_and_pc(Handle exception, address pc) {
396 // We never grab a lock to read the exception cache, so we may
397 // have false negatives. This is okay, as it can only happen during
398 // the first few exception lookups for a given nmethod.
399 ExceptionCache* ec = exception_cache();
400 while (ec != NULL) {
401 address ret_val;
402 if ((ret_val = ec->match(exception,pc)) != NULL) {
403 return ret_val;
404 }
405 ec = ec->next();
406 }
407 return NULL;
408 }
409
410
411 void nmethod::add_handler_for_exception_and_pc(Handle exception, address pc, address handler) {
412 // There are potential race conditions during exception cache updates, so we
413 // must own the ExceptionCache_lock before doing ANY modifications. Because
414 // we don't lock during reads, it is possible to have several threads attempt
415 // to update the cache with the same data. We need to check for already inserted
416 // copies of the current data before adding it.
417
418 MutexLocker ml(ExceptionCache_lock);
419 ExceptionCache* target_entry = exception_cache_entry_for_exception(exception);
420
421 if (target_entry == NULL || !target_entry->add_address_and_handler(pc,handler)) {
422 target_entry = new ExceptionCache(exception,pc,handler);
423 add_exception_cache_entry(target_entry);
424 }
425 }
426
427
428 //-------------end of code for ExceptionCache--------------
429
430
431 int nmethod::total_size() const {
432 return
433 consts_size() +
434 insts_size() +
435 stub_size() +
436 scopes_data_size() +
437 scopes_pcs_size() +
438 handler_table_size() +
439 nul_chk_table_size();
440 }
441
442 const char* nmethod::compile_kind() const {
443 if (is_osr_method()) return "osr";
444 if (method() != NULL && is_native_method()) return "c2n";
445 return NULL;
446 }
447
448 // Fill in default values for various flag fields
449 void nmethod::init_defaults() {
450 _state = in_use;
451 _unloading_clock = 0;
452 _marked_for_reclamation = 0;
453 _has_flushed_dependencies = 0;
454 _has_unsafe_access = 0;
455 _has_method_handle_invokes = 0;
456 _lazy_critical_native = 0;
457 _has_wide_vectors = 0;
458 _marked_for_deoptimization = 0;
459 _lock_count = 0;
460 _stack_traversal_mark = 0;
461 _unload_reported = false; // jvmti state
462
463 #ifdef ASSERT
464 _oops_are_stale = false;
465 #endif
466
467 _oops_do_mark_link = NULL;
468 _jmethod_id = NULL;
469 _osr_link = NULL;
470 if (UseG1GC) {
471 _unloading_next = NULL;
472 } else {
473 _scavenge_root_link = NULL;
474 }
475 _scavenge_root_state = 0;
476 _compiler = NULL;
477 #if INCLUDE_RTM_OPT
478 _rtm_state = NoRTM;
479 #endif
480 #ifdef HAVE_DTRACE_H
481 _trap_offset = 0;
482 #endif // def HAVE_DTRACE_H
483 }
484
485 nmethod* nmethod::new_native_nmethod(methodHandle method,
486 int compile_id,
487 CodeBuffer *code_buffer,
488 int vep_offset,
489 int frame_complete,
490 int frame_size,
491 ByteSize basic_lock_owner_sp_offset,
492 ByteSize basic_lock_sp_offset,
493 OopMapSet* oop_maps) {
494 code_buffer->finalize_oop_references(method);
495 // create nmethod
496 nmethod* nm = NULL;
497 {
498 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
499 int native_nmethod_size = allocation_size(code_buffer, sizeof(nmethod));
500 CodeOffsets offsets;
501 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
502 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
503 nm = new (native_nmethod_size, CompLevel_none) nmethod(method(), native_nmethod_size,
504 compile_id, &offsets,
505 code_buffer, frame_size,
506 basic_lock_owner_sp_offset,
507 basic_lock_sp_offset, oop_maps);
508 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_native_nmethod(nm));
509 if (PrintAssembly && nm != NULL) {
510 Disassembler::decode(nm);
511 }
512 }
513 // verify nmethod
514 debug_only(if (nm) nm->verify();) // might block
515
516 if (nm != NULL) {
517 nm->log_new_nmethod();
518 }
519
520 return nm;
521 }
522
523 #ifdef HAVE_DTRACE_H
524 nmethod* nmethod::new_dtrace_nmethod(methodHandle method,
525 CodeBuffer *code_buffer,
526 int vep_offset,
527 int trap_offset,
528 int frame_complete,
529 int frame_size) {
530 code_buffer->finalize_oop_references(method);
531 // create nmethod
532 nmethod* nm = NULL;
533 {
534 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
535 int nmethod_size = allocation_size(code_buffer, sizeof(nmethod));
536 CodeOffsets offsets;
537 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
538 offsets.set_value(CodeOffsets::Dtrace_trap, trap_offset);
539 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
540
541 nm = new (nmethod_size, CompLevel_none) nmethod(method(), nmethod_size,
542 &offsets, code_buffer, frame_size);
543
544 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_nmethod(nm));
545 if (PrintAssembly && nm != NULL) {
546 Disassembler::decode(nm);
547 }
548 }
549 // verify nmethod
550 debug_only(if (nm) nm->verify();) // might block
551
552 if (nm != NULL) {
553 nm->log_new_nmethod();
554 }
555
556 return nm;
557 }
558
559 #endif // def HAVE_DTRACE_H
560
561 nmethod* nmethod::new_nmethod(methodHandle method,
562 int compile_id,
563 int entry_bci,
564 CodeOffsets* offsets,
565 int orig_pc_offset,
566 DebugInformationRecorder* debug_info,
567 Dependencies* dependencies,
568 CodeBuffer* code_buffer, int frame_size,
569 OopMapSet* oop_maps,
570 ExceptionHandlerTable* handler_table,
571 ImplicitExceptionTable* nul_chk_table,
572 AbstractCompiler* compiler,
573 int comp_level
574 )
575 {
576 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
577 code_buffer->finalize_oop_references(method);
578 // create nmethod
579 nmethod* nm = NULL;
580 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
581 int nmethod_size =
582 allocation_size(code_buffer, sizeof(nmethod))
583 + adjust_pcs_size(debug_info->pcs_size())
584 + round_to(dependencies->size_in_bytes() , oopSize)
585 + round_to(handler_table->size_in_bytes(), oopSize)
586 + round_to(nul_chk_table->size_in_bytes(), oopSize)
587 + round_to(debug_info->data_size() , oopSize);
588
589 nm = new (nmethod_size, comp_level)
590 nmethod(method(), nmethod_size, compile_id, entry_bci, offsets,
591 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size,
592 oop_maps,
593 handler_table,
594 nul_chk_table,
595 compiler,
596 comp_level);
597
598 if (nm != NULL) {
599 // To make dependency checking during class loading fast, record
600 // the nmethod dependencies in the classes it is dependent on.
601 // This allows the dependency checking code to simply walk the
602 // class hierarchy above the loaded class, checking only nmethods
603 // which are dependent on those classes. The slow way is to
604 // check every nmethod for dependencies which makes it linear in
605 // the number of methods compiled. For applications with a lot
606 // classes the slow way is too slow.
607 for (Dependencies::DepStream deps(nm); deps.next(); ) {
608 Klass* klass = deps.context_type();
609 if (klass == NULL) {
610 continue; // ignore things like evol_method
611 }
612
613 // record this nmethod as dependent on this klass
614 InstanceKlass::cast(klass)->add_dependent_nmethod(nm);
615 }
616 NOT_PRODUCT(nmethod_stats.note_nmethod(nm));
617 if (PrintAssembly || CompilerOracle::has_option_string(method, "PrintAssembly")) {
618 Disassembler::decode(nm);
619 }
620 }
621 }
622 // Do verification and logging outside CodeCache_lock.
623 if (nm != NULL) {
624 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
625 DEBUG_ONLY(nm->verify();)
626 nm->log_new_nmethod();
627 }
628 return nm;
629 }
630
631
632 // For native wrappers
633 nmethod::nmethod(
634 Method* method,
635 int nmethod_size,
636 int compile_id,
637 CodeOffsets* offsets,
638 CodeBuffer* code_buffer,
639 int frame_size,
640 ByteSize basic_lock_owner_sp_offset,
641 ByteSize basic_lock_sp_offset,
642 OopMapSet* oop_maps )
643 : CodeBlob("native nmethod", code_buffer, sizeof(nmethod),
644 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps),
645 _native_receiver_sp_offset(basic_lock_owner_sp_offset),
646 _native_basic_lock_sp_offset(basic_lock_sp_offset)
647 {
648 {
649 debug_only(No_Safepoint_Verifier nsv;)
650 assert_locked_or_safepoint(CodeCache_lock);
651
652 init_defaults();
653 _method = method;
654 _entry_bci = InvocationEntryBci;
655 // We have no exception handler or deopt handler make the
656 // values something that will never match a pc like the nmethod vtable entry
657 _exception_offset = 0;
658 _deoptimize_offset = 0;
659 _deoptimize_mh_offset = 0;
660 _orig_pc_offset = 0;
661
662 _consts_offset = data_offset();
663 _stub_offset = data_offset();
664 _oops_offset = data_offset();
665 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize);
666 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize);
667 _scopes_pcs_offset = _scopes_data_offset;
668 _dependencies_offset = _scopes_pcs_offset;
669 _handler_table_offset = _dependencies_offset;
670 _nul_chk_table_offset = _handler_table_offset;
671 _nmethod_end_offset = _nul_chk_table_offset;
672 _compile_id = compile_id;
673 _comp_level = CompLevel_none;
674 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
675 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
676 _osr_entry_point = NULL;
677 _exception_cache = NULL;
678 _pc_desc_cache.reset_to(NULL);
679 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
680
681 code_buffer->copy_values_to(this);
682 if (ScavengeRootsInCode) {
683 if (detect_scavenge_root_oops()) {
684 CodeCache::add_scavenge_root_nmethod(this);
685 }
686 Universe::heap()->register_nmethod(this);
687 }
688 debug_only(verify_scavenge_root_oops());
689 CodeCache::commit(this);
690 }
691
692 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
693 ttyLocker ttyl; // keep the following output all in one block
694 // This output goes directly to the tty, not the compiler log.
695 // To enable tools to match it up with the compilation activity,
696 // be sure to tag this tty output with the compile ID.
697 if (xtty != NULL) {
698 xtty->begin_head("print_native_nmethod");
699 xtty->method(_method);
700 xtty->stamp();
701 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
702 }
703 // print the header part first
704 print();
705 // then print the requested information
706 if (PrintNativeNMethods) {
707 print_code();
708 if (oop_maps != NULL) {
709 oop_maps->print();
710 }
711 }
712 if (PrintRelocations) {
713 print_relocations();
714 }
715 if (xtty != NULL) {
716 xtty->tail("print_native_nmethod");
717 }
718 }
719 }
720
721 // For dtrace wrappers
722 #ifdef HAVE_DTRACE_H
723 nmethod::nmethod(
724 Method* method,
725 int nmethod_size,
726 CodeOffsets* offsets,
727 CodeBuffer* code_buffer,
728 int frame_size)
729 : CodeBlob("dtrace nmethod", code_buffer, sizeof(nmethod),
730 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, NULL),
731 _native_receiver_sp_offset(in_ByteSize(-1)),
732 _native_basic_lock_sp_offset(in_ByteSize(-1))
733 {
734 {
735 debug_only(No_Safepoint_Verifier nsv;)
736 assert_locked_or_safepoint(CodeCache_lock);
737
738 init_defaults();
739 _method = method;
740 _entry_bci = InvocationEntryBci;
741 // We have no exception handler or deopt handler make the
742 // values something that will never match a pc like the nmethod vtable entry
743 _exception_offset = 0;
744 _deoptimize_offset = 0;
745 _deoptimize_mh_offset = 0;
746 _unwind_handler_offset = -1;
747 _trap_offset = offsets->value(CodeOffsets::Dtrace_trap);
748 _orig_pc_offset = 0;
749 _consts_offset = data_offset();
750 _stub_offset = data_offset();
751 _oops_offset = data_offset();
752 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize);
753 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize);
754 _scopes_pcs_offset = _scopes_data_offset;
755 _dependencies_offset = _scopes_pcs_offset;
756 _handler_table_offset = _dependencies_offset;
757 _nul_chk_table_offset = _handler_table_offset;
758 _nmethod_end_offset = _nul_chk_table_offset;
759 _compile_id = 0; // default
760 _comp_level = CompLevel_none;
761 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
762 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
763 _osr_entry_point = NULL;
764 _exception_cache = NULL;
765 _pc_desc_cache.reset_to(NULL);
766 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
767
768 code_buffer->copy_values_to(this);
769 if (ScavengeRootsInCode) {
770 if (detect_scavenge_root_oops()) {
771 CodeCache::add_scavenge_root_nmethod(this);
772 }
773 Universe::heap()->register_nmethod(this);
774 }
775 DEBUG_ONLY(verify_scavenge_root_oops();)
776 CodeCache::commit(this);
777 }
778
779 if (PrintNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
780 ttyLocker ttyl; // keep the following output all in one block
781 // This output goes directly to the tty, not the compiler log.
782 // To enable tools to match it up with the compilation activity,
783 // be sure to tag this tty output with the compile ID.
784 if (xtty != NULL) {
785 xtty->begin_head("print_dtrace_nmethod");
786 xtty->method(_method);
787 xtty->stamp();
788 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
789 }
790 // print the header part first
791 print();
792 // then print the requested information
793 if (PrintNMethods) {
794 print_code();
795 }
796 if (PrintRelocations) {
797 print_relocations();
798 }
799 if (xtty != NULL) {
800 xtty->tail("print_dtrace_nmethod");
801 }
802 }
803 }
804 #endif // def HAVE_DTRACE_H
805
806 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () {
807 // With a SegmentedCodeCache, nmethods are allocated on separate heaps and therefore do not share memory
808 // with critical CodeBlobs. We define the allocation as critical to make sure all code heap memory is used.
809 bool is_critical = SegmentedCodeCache;
810 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level), is_critical);
811 }
812
813 nmethod::nmethod(
814 Method* method,
815 int nmethod_size,
816 int compile_id,
817 int entry_bci,
818 CodeOffsets* offsets,
819 int orig_pc_offset,
820 DebugInformationRecorder* debug_info,
821 Dependencies* dependencies,
822 CodeBuffer *code_buffer,
823 int frame_size,
824 OopMapSet* oop_maps,
825 ExceptionHandlerTable* handler_table,
826 ImplicitExceptionTable* nul_chk_table,
827 AbstractCompiler* compiler,
828 int comp_level
829 )
830 : CodeBlob("nmethod", code_buffer, sizeof(nmethod),
831 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps),
832 _native_receiver_sp_offset(in_ByteSize(-1)),
833 _native_basic_lock_sp_offset(in_ByteSize(-1))
834 {
835 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
836 {
837 debug_only(No_Safepoint_Verifier nsv;)
838 assert_locked_or_safepoint(CodeCache_lock);
839
840 init_defaults();
841 _method = method;
842 _entry_bci = entry_bci;
843 _compile_id = compile_id;
844 _comp_level = comp_level;
845 _compiler = compiler;
846 _orig_pc_offset = orig_pc_offset;
847 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
848
849 // Section offsets
850 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts());
851 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs());
852
853 // Exception handler and deopt handler are in the stub section
854 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set");
855 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set");
856 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
857 _deoptimize_offset = _stub_offset + offsets->value(CodeOffsets::Deopt);
858 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
859 _deoptimize_mh_offset = _stub_offset + offsets->value(CodeOffsets::DeoptMH);
860 } else {
861 _deoptimize_mh_offset = -1;
862 }
863 if (offsets->value(CodeOffsets::UnwindHandler) != -1) {
864 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler);
865 } else {
866 _unwind_handler_offset = -1;
867 }
868
869 _oops_offset = data_offset();
870 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize);
871 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize);
872
873 _scopes_pcs_offset = _scopes_data_offset + round_to(debug_info->data_size (), oopSize);
874 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
875 _handler_table_offset = _dependencies_offset + round_to(dependencies->size_in_bytes (), oopSize);
876 _nul_chk_table_offset = _handler_table_offset + round_to(handler_table->size_in_bytes(), oopSize);
877 _nmethod_end_offset = _nul_chk_table_offset + round_to(nul_chk_table->size_in_bytes(), oopSize);
878
879 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
880 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
881 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry);
882 _exception_cache = NULL;
883 _pc_desc_cache.reset_to(scopes_pcs_begin());
884
885 // Copy contents of ScopeDescRecorder to nmethod
886 code_buffer->copy_values_to(this);
887 debug_info->copy_to(this);
888 dependencies->copy_to(this);
889 if (ScavengeRootsInCode) {
890 if (detect_scavenge_root_oops()) {
891 CodeCache::add_scavenge_root_nmethod(this);
892 }
893 Universe::heap()->register_nmethod(this);
894 }
895 debug_only(verify_scavenge_root_oops());
896
897 CodeCache::commit(this);
898
899 // Copy contents of ExceptionHandlerTable to nmethod
900 handler_table->copy_to(this);
901 nul_chk_table->copy_to(this);
902
903 // we use the information of entry points to find out if a method is
904 // static or non static
905 assert(compiler->is_c2() ||
906 _method->is_static() == (entry_point() == _verified_entry_point),
907 " entry points must be same for static methods and vice versa");
908 }
909
910 bool printnmethods = PrintNMethods
911 || CompilerOracle::should_print(_method)
912 || CompilerOracle::has_option_string(_method, "PrintNMethods");
913 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
914 print_nmethod(printnmethods);
915 }
916 }
917
918
919 // Print a short set of xml attributes to identify this nmethod. The
920 // output should be embedded in some other element.
921 void nmethod::log_identity(xmlStream* log) const {
922 log->print(" compile_id='%d'", compile_id());
923 const char* nm_kind = compile_kind();
924 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind);
925 if (compiler() != NULL) {
926 log->print(" compiler='%s'", compiler()->name());
927 }
928 if (TieredCompilation) {
929 log->print(" level='%d'", comp_level());
930 }
931 }
932
933
934 #define LOG_OFFSET(log, name) \
935 if ((intptr_t)name##_end() - (intptr_t)name##_begin()) \
936 log->print(" " XSTR(name) "_offset='%d'" , \
937 (intptr_t)name##_begin() - (intptr_t)this)
938
939
940 void nmethod::log_new_nmethod() const {
941 if (LogCompilation && xtty != NULL) {
942 ttyLocker ttyl;
943 HandleMark hm;
944 xtty->begin_elem("nmethod");
945 log_identity(xtty);
946 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", code_begin(), size());
947 xtty->print(" address='" INTPTR_FORMAT "'", (intptr_t) this);
948
949 LOG_OFFSET(xtty, relocation);
950 LOG_OFFSET(xtty, consts);
951 LOG_OFFSET(xtty, insts);
952 LOG_OFFSET(xtty, stub);
953 LOG_OFFSET(xtty, scopes_data);
954 LOG_OFFSET(xtty, scopes_pcs);
955 LOG_OFFSET(xtty, dependencies);
956 LOG_OFFSET(xtty, handler_table);
957 LOG_OFFSET(xtty, nul_chk_table);
958 LOG_OFFSET(xtty, oops);
959
960 xtty->method(method());
961 xtty->stamp();
962 xtty->end_elem();
963 }
964 }
965
966 #undef LOG_OFFSET
967
968
969 // Print out more verbose output usually for a newly created nmethod.
970 void nmethod::print_on(outputStream* st, const char* msg) const {
971 if (st != NULL) {
972 ttyLocker ttyl;
973 if (WizardMode) {
974 CompileTask::print_compilation(st, this, msg, /*short_form:*/ true);
975 st->print_cr(" (" INTPTR_FORMAT ")", this);
976 } else {
977 CompileTask::print_compilation(st, this, msg, /*short_form:*/ false);
978 }
979 }
980 }
981
982
983 void nmethod::print_nmethod(bool printmethod) {
984 ttyLocker ttyl; // keep the following output all in one block
985 if (xtty != NULL) {
986 xtty->begin_head("print_nmethod");
987 xtty->stamp();
988 xtty->end_head();
989 }
990 // print the header part first
991 print();
992 // then print the requested information
993 if (printmethod) {
994 print_code();
995 print_pcs();
996 if (oop_maps()) {
997 oop_maps()->print();
998 }
999 }
1000 if (PrintDebugInfo) {
1001 print_scopes();
1002 }
1003 if (PrintRelocations) {
1004 print_relocations();
1005 }
1006 if (PrintDependencies) {
1007 print_dependencies();
1008 }
1009 if (PrintExceptionHandlers) {
1010 print_handler_table();
1011 print_nul_chk_table();
1012 }
1013 if (xtty != NULL) {
1014 xtty->tail("print_nmethod");
1015 }
1016 }
1017
1018
1019 // Promote one word from an assembly-time handle to a live embedded oop.
1020 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
1021 if (handle == NULL ||
1022 // As a special case, IC oops are initialized to 1 or -1.
1023 handle == (jobject) Universe::non_oop_word()) {
1024 (*dest) = (oop) handle;
1025 } else {
1026 (*dest) = JNIHandles::resolve_non_null(handle);
1027 }
1028 }
1029
1030
1031 // Have to have the same name because it's called by a template
1032 void nmethod::copy_values(GrowableArray<jobject>* array) {
1033 int length = array->length();
1034 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
1035 oop* dest = oops_begin();
1036 for (int index = 0 ; index < length; index++) {
1037 initialize_immediate_oop(&dest[index], array->at(index));
1038 }
1039
1040 // Now we can fix up all the oops in the code. We need to do this
1041 // in the code because the assembler uses jobjects as placeholders.
1042 // The code and relocations have already been initialized by the
1043 // CodeBlob constructor, so it is valid even at this early point to
1044 // iterate over relocations and patch the code.
1045 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true);
1046 }
1047
1048 void nmethod::copy_values(GrowableArray<Metadata*>* array) {
1049 int length = array->length();
1050 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough");
1051 Metadata** dest = metadata_begin();
1052 for (int index = 0 ; index < length; index++) {
1053 dest[index] = array->at(index);
1054 }
1055 }
1056
1057 bool nmethod::is_at_poll_return(address pc) {
1058 RelocIterator iter(this, pc, pc+1);
1059 while (iter.next()) {
1060 if (iter.type() == relocInfo::poll_return_type)
1061 return true;
1062 }
1063 return false;
1064 }
1065
1066
1067 bool nmethod::is_at_poll_or_poll_return(address pc) {
1068 RelocIterator iter(this, pc, pc+1);
1069 while (iter.next()) {
1070 relocInfo::relocType t = iter.type();
1071 if (t == relocInfo::poll_return_type || t == relocInfo::poll_type)
1072 return true;
1073 }
1074 return false;
1075 }
1076
1077
1078 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) {
1079 // re-patch all oop-bearing instructions, just in case some oops moved
1080 RelocIterator iter(this, begin, end);
1081 while (iter.next()) {
1082 if (iter.type() == relocInfo::oop_type) {
1083 oop_Relocation* reloc = iter.oop_reloc();
1084 if (initialize_immediates && reloc->oop_is_immediate()) {
1085 oop* dest = reloc->oop_addr();
1086 initialize_immediate_oop(dest, (jobject) *dest);
1087 }
1088 // Refresh the oop-related bits of this instruction.
1089 reloc->fix_oop_relocation();
1090 } else if (iter.type() == relocInfo::metadata_type) {
1091 metadata_Relocation* reloc = iter.metadata_reloc();
1092 reloc->fix_metadata_relocation();
1093 }
1094 }
1095 }
1096
1097
1098 void nmethod::verify_oop_relocations() {
1099 // Ensure sure that the code matches the current oop values
1100 RelocIterator iter(this, NULL, NULL);
1101 while (iter.next()) {
1102 if (iter.type() == relocInfo::oop_type) {
1103 oop_Relocation* reloc = iter.oop_reloc();
1104 if (!reloc->oop_is_immediate()) {
1105 reloc->verify_oop_relocation();
1106 }
1107 }
1108 }
1109 }
1110
1111
1112 ScopeDesc* nmethod::scope_desc_at(address pc) {
1113 PcDesc* pd = pc_desc_at(pc);
1114 guarantee(pd != NULL, "scope must be present");
1115 return new ScopeDesc(this, pd->scope_decode_offset(),
1116 pd->obj_decode_offset(), pd->should_reexecute(),
1117 pd->return_oop());
1118 }
1119
1120
1121 void nmethod::clear_inline_caches() {
1122 assert(SafepointSynchronize::is_at_safepoint(), "cleaning of IC's only allowed at safepoint");
1123 if (is_zombie()) {
1124 return;
1125 }
1126
1127 RelocIterator iter(this);
1128 while (iter.next()) {
1129 iter.reloc()->clear_inline_cache();
1130 }
1131 }
1132
1133 // Clear ICStubs of all compiled ICs
1134 void nmethod::clear_ic_stubs() {
1135 assert_locked_or_safepoint(CompiledIC_lock);
1136 RelocIterator iter(this);
1137 while(iter.next()) {
1138 if (iter.type() == relocInfo::virtual_call_type) {
1139 CompiledIC* ic = CompiledIC_at(&iter);
1140 ic->clear_ic_stub();
1141 }
1142 }
1143 }
1144
1145
1146 void nmethod::cleanup_inline_caches() {
1147
1148 assert_locked_or_safepoint(CompiledIC_lock);
1149
1150 // If the method is not entrant or zombie then a JMP is plastered over the
1151 // first few bytes. If an oop in the old code was there, that oop
1152 // should not get GC'd. Skip the first few bytes of oops on
1153 // not-entrant methods.
1154 address low_boundary = verified_entry_point();
1155 if (!is_in_use()) {
1156 low_boundary += NativeJump::instruction_size;
1157 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1158 // This means that the low_boundary is going to be a little too high.
1159 // This shouldn't matter, since oops of non-entrant methods are never used.
1160 // In fact, why are we bothering to look at oops in a non-entrant method??
1161 }
1162
1163 // Find all calls in an nmethod, and clear the ones that points to zombie methods
1164 ResourceMark rm;
1165 RelocIterator iter(this, low_boundary);
1166 while(iter.next()) {
1167 switch(iter.type()) {
1168 case relocInfo::virtual_call_type:
1169 case relocInfo::opt_virtual_call_type: {
1170 CompiledIC *ic = CompiledIC_at(&iter);
1171 // Ok, to lookup references to zombies here
1172 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
1173 if( cb != NULL && cb->is_nmethod() ) {
1174 nmethod* nm = (nmethod*)cb;
1175 // Clean inline caches pointing to both zombie and not_entrant methods
1176 if (!nm->is_in_use() || (nm->method()->code() != nm)) ic->set_to_clean();
1177 }
1178 break;
1179 }
1180 case relocInfo::static_call_type: {
1181 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
1182 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
1183 if( cb != NULL && cb->is_nmethod() ) {
1184 nmethod* nm = (nmethod*)cb;
1185 // Clean inline caches pointing to both zombie and not_entrant methods
1186 if (!nm->is_in_use() || (nm->method()->code() != nm)) csc->set_to_clean();
1187 }
1188 break;
1189 }
1190 }
1191 }
1192 }
1193
1194 void nmethod::verify_clean_inline_caches() {
1195 assert_locked_or_safepoint(CompiledIC_lock);
1196
1197 // If the method is not entrant or zombie then a JMP is plastered over the
1198 // first few bytes. If an oop in the old code was there, that oop
1199 // should not get GC'd. Skip the first few bytes of oops on
1200 // not-entrant methods.
1201 address low_boundary = verified_entry_point();
1202 if (!is_in_use()) {
1203 low_boundary += NativeJump::instruction_size;
1204 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1205 // This means that the low_boundary is going to be a little too high.
1206 // This shouldn't matter, since oops of non-entrant methods are never used.
1207 // In fact, why are we bothering to look at oops in a non-entrant method??
1208 }
1209
1210 ResourceMark rm;
1211 RelocIterator iter(this, low_boundary);
1212 while(iter.next()) {
1213 switch(iter.type()) {
1214 case relocInfo::virtual_call_type:
1215 case relocInfo::opt_virtual_call_type: {
1216 CompiledIC *ic = CompiledIC_at(&iter);
1217 // Ok, to lookup references to zombies here
1218 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
1219 if( cb != NULL && cb->is_nmethod() ) {
1220 nmethod* nm = (nmethod*)cb;
1221 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
1222 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1223 assert(ic->is_clean(), "IC should be clean");
1224 }
1225 }
1226 break;
1227 }
1228 case relocInfo::static_call_type: {
1229 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
1230 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
1231 if( cb != NULL && cb->is_nmethod() ) {
1232 nmethod* nm = (nmethod*)cb;
1233 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
1234 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1235 assert(csc->is_clean(), "IC should be clean");
1236 }
1237 }
1238 break;
1239 }
1240 }
1241 }
1242 }
1243
1244 int nmethod::verify_icholder_relocations() {
1245 int count = 0;
1246
1247 RelocIterator iter(this);
1248 while(iter.next()) {
1249 if (iter.type() == relocInfo::virtual_call_type) {
1250 if (CompiledIC::is_icholder_call_site(iter.virtual_call_reloc())) {
1251 CompiledIC *ic = CompiledIC_at(&iter);
1252 if (TraceCompiledIC) {
1253 tty->print("noticed icholder " INTPTR_FORMAT " ", p2i(ic->cached_icholder()));
1254 ic->print();
1255 }
1256 assert(ic->cached_icholder() != NULL, "must be non-NULL");
1257 count++;
1258 }
1259 }
1260 }
1261
1262 return count;
1263 }
1264
1265 // This is a private interface with the sweeper.
1266 void nmethod::mark_as_seen_on_stack() {
1267 assert(is_alive(), "Must be an alive method");
1268 // Set the traversal mark to ensure that the sweeper does 2
1269 // cleaning passes before moving to zombie.
1270 set_stack_traversal_mark(NMethodSweeper::traversal_count());
1271 }
1272
1273 // Tell if a non-entrant method can be converted to a zombie (i.e.,
1274 // there are no activations on the stack, not in use by the VM,
1275 // and not in use by the ServiceThread)
1276 bool nmethod::can_not_entrant_be_converted() {
1277 assert(is_not_entrant(), "must be a non-entrant method");
1278
1279 // Since the nmethod sweeper only does partial sweep the sweeper's traversal
1280 // count can be greater than the stack traversal count before it hits the
1281 // nmethod for the second time.
1282 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count() &&
1283 !is_locked_by_vm();
1284 }
1285
1286 void nmethod::inc_decompile_count() {
1287 if (!is_compiled_by_c2()) return;
1288 // Could be gated by ProfileTraps, but do not bother...
1289 Method* m = method();
1290 if (m == NULL) return;
1291 MethodData* mdo = m->method_data();
1292 if (mdo == NULL) return;
1293 // There is a benign race here. See comments in methodData.hpp.
1294 mdo->inc_decompile_count();
1295 }
1296
1297 void nmethod::increase_unloading_clock() {
1298 _global_unloading_clock++;
1299 if (_global_unloading_clock == 0) {
1300 // _nmethods are allocated with _unloading_clock == 0,
1301 // so 0 is never used as a clock value.
1302 _global_unloading_clock = 1;
1303 }
1304 }
1305
1306 void nmethod::set_unloading_clock(unsigned char unloading_clock) {
1307 OrderAccess::release_store((volatile jubyte*)&_unloading_clock, unloading_clock);
1308 }
1309
1310 unsigned char nmethod::unloading_clock() {
1311 return (unsigned char)OrderAccess::load_acquire((volatile jubyte*)&_unloading_clock);
1312 }
1313
1314 void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) {
1315
1316 post_compiled_method_unload();
1317
1318 // Since this nmethod is being unloaded, make sure that dependencies
1319 // recorded in instanceKlasses get flushed and pass non-NULL closure to
1320 // indicate that this work is being done during a GC.
1321 assert(Universe::heap()->is_gc_active(), "should only be called during gc");
1322 assert(is_alive != NULL, "Should be non-NULL");
1323 // A non-NULL is_alive closure indicates that this is being called during GC.
1324 flush_dependencies(is_alive);
1325
1326 // Break cycle between nmethod & method
1327 if (TraceClassUnloading && WizardMode) {
1328 tty->print_cr("[Class unloading: Making nmethod " INTPTR_FORMAT
1329 " unloadable], Method*(" INTPTR_FORMAT
1330 "), cause(" INTPTR_FORMAT ")",
1331 this, (address)_method, (address)cause);
1332 if (!Universe::heap()->is_gc_active())
1333 cause->klass()->print();
1334 }
1335 // Unlink the osr method, so we do not look this up again
1336 if (is_osr_method()) {
1337 invalidate_osr_method();
1338 }
1339 // If _method is already NULL the Method* is about to be unloaded,
1340 // so we don't have to break the cycle. Note that it is possible to
1341 // have the Method* live here, in case we unload the nmethod because
1342 // it is pointing to some oop (other than the Method*) being unloaded.
1343 if (_method != NULL) {
1344 // OSR methods point to the Method*, but the Method* does not
1345 // point back!
1346 if (_method->code() == this) {
1347 _method->clear_code(); // Break a cycle
1348 }
1349 _method = NULL; // Clear the method of this dead nmethod
1350 }
1351 // Make the class unloaded - i.e., change state and notify sweeper
1352 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
1353 if (is_in_use()) {
1354 // Transitioning directly from live to unloaded -- so
1355 // we need to force a cache clean-up; remember this
1356 // for later on.
1357 CodeCache::set_needs_cache_clean(true);
1358 }
1359
1360 // Unregister must be done before the state change
1361 Universe::heap()->unregister_nmethod(this);
1362
1363 _state = unloaded;
1364
1365 // Log the unloading.
1366 log_state_change();
1367
1368 // The Method* is gone at this point
1369 assert(_method == NULL, "Tautology");
1370
1371 set_osr_link(NULL);
1372 //set_scavenge_root_link(NULL); // done by prune_scavenge_root_nmethods
1373 NMethodSweeper::report_state_change(this);
1374 }
1375
1376 void nmethod::invalidate_osr_method() {
1377 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
1378 // Remove from list of active nmethods
1379 if (method() != NULL)
1380 method()->method_holder()->remove_osr_nmethod(this);
1381 }
1382
1383 void nmethod::log_state_change() const {
1384 if (LogCompilation) {
1385 if (xtty != NULL) {
1386 ttyLocker ttyl; // keep the following output all in one block
1387 if (_state == unloaded) {
1388 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'",
1389 os::current_thread_id());
1390 } else {
1391 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s",
1392 os::current_thread_id(),
1393 (_state == zombie ? " zombie='1'" : ""));
1394 }
1395 log_identity(xtty);
1396 xtty->stamp();
1397 xtty->end_elem();
1398 }
1399 }
1400 if (PrintCompilation && _state != unloaded) {
1401 print_on(tty, _state == zombie ? "made zombie" : "made not entrant");
1402 }
1403 }
1404
1405 /**
1406 * Common functionality for both make_not_entrant and make_zombie
1407 */
1408 bool nmethod::make_not_entrant_or_zombie(unsigned int state) {
1409 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant");
1410 assert(!is_zombie(), "should not already be a zombie");
1411
1412 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below.
1413 nmethodLocker nml(this);
1414 methodHandle the_method(method());
1415 No_Safepoint_Verifier nsv;
1416
1417 // during patching, depending on the nmethod state we must notify the GC that
1418 // code has been unloaded, unregistering it. We cannot do this right while
1419 // holding the Patching_lock because we need to use the CodeCache_lock. This
1420 // would be prone to deadlocks.
1421 // This flag is used to remember whether we need to later lock and unregister.
1422 bool nmethod_needs_unregister = false;
1423
1424 {
1425 // invalidate osr nmethod before acquiring the patching lock since
1426 // they both acquire leaf locks and we don't want a deadlock.
1427 // This logic is equivalent to the logic below for patching the
1428 // verified entry point of regular methods.
1429 if (is_osr_method()) {
1430 // this effectively makes the osr nmethod not entrant
1431 invalidate_osr_method();
1432 }
1433
1434 // Enter critical section. Does not block for safepoint.
1435 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1436
1437 if (_state == state) {
1438 // another thread already performed this transition so nothing
1439 // to do, but return false to indicate this.
1440 return false;
1441 }
1442
1443 // The caller can be calling the method statically or through an inline
1444 // cache call.
1445 if (!is_osr_method() && !is_not_entrant()) {
1446 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
1447 SharedRuntime::get_handle_wrong_method_stub());
1448 }
1449
1450 if (is_in_use()) {
1451 // It's a true state change, so mark the method as decompiled.
1452 // Do it only for transition from alive.
1453 inc_decompile_count();
1454 }
1455
1456 // If the state is becoming a zombie, signal to unregister the nmethod with
1457 // the heap.
1458 // This nmethod may have already been unloaded during a full GC.
1459 if ((state == zombie) && !is_unloaded()) {
1460 nmethod_needs_unregister = true;
1461 }
1462
1463 // Must happen before state change. Otherwise we have a race condition in
1464 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately
1465 // transition its state from 'not_entrant' to 'zombie' without having to wait
1466 // for stack scanning.
1467 if (state == not_entrant) {
1468 mark_as_seen_on_stack();
1469 OrderAccess::storestore();
1470 }
1471
1472 // Change state
1473 _state = state;
1474
1475 // Log the transition once
1476 log_state_change();
1477
1478 // Remove nmethod from method.
1479 // We need to check if both the _code and _from_compiled_code_entry_point
1480 // refer to this nmethod because there is a race in setting these two fields
1481 // in Method* as seen in bugid 4947125.
1482 // If the vep() points to the zombie nmethod, the memory for the nmethod
1483 // could be flushed and the compiler and vtable stubs could still call
1484 // through it.
1485 if (method() != NULL && (method()->code() == this ||
1486 method()->from_compiled_entry() == verified_entry_point())) {
1487 HandleMark hm;
1488 method()->clear_code();
1489 }
1490 } // leave critical region under Patching_lock
1491
1492 // When the nmethod becomes zombie it is no longer alive so the
1493 // dependencies must be flushed. nmethods in the not_entrant
1494 // state will be flushed later when the transition to zombie
1495 // happens or they get unloaded.
1496 if (state == zombie) {
1497 {
1498 // Flushing dependecies must be done before any possible
1499 // safepoint can sneak in, otherwise the oops used by the
1500 // dependency logic could have become stale.
1501 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1502 if (nmethod_needs_unregister) {
1503 Universe::heap()->unregister_nmethod(this);
1504 }
1505 flush_dependencies(NULL);
1506 }
1507
1508
1509
1510 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload
1511 // event and it hasn't already been reported for this nmethod then
1512 // report it now. The event may have been reported earilier if the GC
1513 // marked it for unloading). JvmtiDeferredEventQueue support means
1514 // we no longer go to a safepoint here.
1515 post_compiled_method_unload();
1516
1517 #ifdef ASSERT
1518 // It's no longer safe to access the oops section since zombie
1519 // nmethods aren't scanned for GC.
1520 _oops_are_stale = true;
1521 #endif
1522 // the Method may be reclaimed by class unloading now that the
1523 // nmethod is in zombie state
1524 set_method(NULL);
1525 } else {
1526 assert(state == not_entrant, "other cases may need to be handled differently");
1527 }
1528
1529 if (TraceCreateZombies) {
1530 tty->print_cr("nmethod <" INTPTR_FORMAT "> code made %s", this, (state == not_entrant) ? "not entrant" : "zombie");
1531 }
1532
1533 NMethodSweeper::report_state_change(this);
1534 return true;
1535 }
1536
1537 void nmethod::flush() {
1538 // Note that there are no valid oops in the nmethod anymore.
1539 assert(is_zombie() || (is_osr_method() && is_unloaded()), "must be a zombie method");
1540 assert(is_marked_for_reclamation() || (is_osr_method() && is_unloaded()), "must be marked for reclamation");
1541
1542 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed");
1543 assert_locked_or_safepoint(CodeCache_lock);
1544
1545 // completely deallocate this method
1546 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, this);
1547 if (PrintMethodFlushing) {
1548 tty->print_cr("*flushing nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT "/Free CodeCache:" SIZE_FORMAT "Kb",
1549 _compile_id, this, CodeCache::nof_blobs(), CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(_comp_level))/1024);
1550 }
1551
1552 // We need to deallocate any ExceptionCache data.
1553 // Note that we do not need to grab the nmethod lock for this, it
1554 // better be thread safe if we're disposing of it!
1555 ExceptionCache* ec = exception_cache();
1556 set_exception_cache(NULL);
1557 while(ec != NULL) {
1558 ExceptionCache* next = ec->next();
1559 delete ec;
1560 ec = next;
1561 }
1562
1563 if (on_scavenge_root_list()) {
1564 CodeCache::drop_scavenge_root_nmethod(this);
1565 }
1566
1567 #ifdef SHARK
1568 ((SharkCompiler *) compiler())->free_compiled_method(insts_begin());
1569 #endif // SHARK
1570
1571 ((CodeBlob*)(this))->flush();
1572
1573 CodeCache::free(this);
1574 }
1575
1576 //
1577 // Notify all classes this nmethod is dependent on that it is no
1578 // longer dependent. This should only be called in two situations.
1579 // First, when a nmethod transitions to a zombie all dependents need
1580 // to be clear. Since zombification happens at a safepoint there's no
1581 // synchronization issues. The second place is a little more tricky.
1582 // During phase 1 of mark sweep class unloading may happen and as a
1583 // result some nmethods may get unloaded. In this case the flushing
1584 // of dependencies must happen during phase 1 since after GC any
1585 // dependencies in the unloaded nmethod won't be updated, so
1586 // traversing the dependency information in unsafe. In that case this
1587 // function is called with a non-NULL argument and this function only
1588 // notifies instanceKlasses that are reachable
1589
1590 void nmethod::flush_dependencies(BoolObjectClosure* is_alive) {
1591 assert_locked_or_safepoint(CodeCache_lock);
1592 assert(Universe::heap()->is_gc_active() == (is_alive != NULL),
1593 "is_alive is non-NULL if and only if we are called during GC");
1594 if (!has_flushed_dependencies()) {
1595 set_has_flushed_dependencies();
1596 for (Dependencies::DepStream deps(this); deps.next(); ) {
1597 Klass* klass = deps.context_type();
1598 if (klass == NULL) continue; // ignore things like evol_method
1599
1600 // During GC the is_alive closure is non-NULL, and is used to
1601 // determine liveness of dependees that need to be updated.
1602 if (is_alive == NULL || klass->is_loader_alive(is_alive)) {
1603 InstanceKlass::cast(klass)->remove_dependent_nmethod(this);
1604 }
1605 }
1606 }
1607 }
1608
1609
1610 // If this oop is not live, the nmethod can be unloaded.
1611 bool nmethod::can_unload(BoolObjectClosure* is_alive, oop* root, bool unloading_occurred) {
1612 assert(root != NULL, "just checking");
1613 oop obj = *root;
1614 if (obj == NULL || is_alive->do_object_b(obj)) {
1615 return false;
1616 }
1617
1618 // If ScavengeRootsInCode is true, an nmethod might be unloaded
1619 // simply because one of its constant oops has gone dead.
1620 // No actual classes need to be unloaded in order for this to occur.
1621 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading");
1622 make_unloaded(is_alive, obj);
1623 return true;
1624 }
1625
1626 // ------------------------------------------------------------------
1627 // post_compiled_method_load_event
1628 // new method for install_code() path
1629 // Transfer information from compilation to jvmti
1630 void nmethod::post_compiled_method_load_event() {
1631
1632 Method* moop = method();
1633 HOTSPOT_COMPILED_METHOD_LOAD(
1634 (char *) moop->klass_name()->bytes(),
1635 moop->klass_name()->utf8_length(),
1636 (char *) moop->name()->bytes(),
1637 moop->name()->utf8_length(),
1638 (char *) moop->signature()->bytes(),
1639 moop->signature()->utf8_length(),
1640 insts_begin(), insts_size());
1641
1642 if (JvmtiExport::should_post_compiled_method_load() ||
1643 JvmtiExport::should_post_compiled_method_unload()) {
1644 get_and_cache_jmethod_id();
1645 }
1646
1647 if (JvmtiExport::should_post_compiled_method_load()) {
1648 // Let the Service thread (which is a real Java thread) post the event
1649 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1650 JvmtiDeferredEventQueue::enqueue(
1651 JvmtiDeferredEvent::compiled_method_load_event(this));
1652 }
1653 }
1654
1655 jmethodID nmethod::get_and_cache_jmethod_id() {
1656 if (_jmethod_id == NULL) {
1657 // Cache the jmethod_id since it can no longer be looked up once the
1658 // method itself has been marked for unloading.
1659 _jmethod_id = method()->jmethod_id();
1660 }
1661 return _jmethod_id;
1662 }
1663
1664 void nmethod::post_compiled_method_unload() {
1665 if (unload_reported()) {
1666 // During unloading we transition to unloaded and then to zombie
1667 // and the unloading is reported during the first transition.
1668 return;
1669 }
1670
1671 assert(_method != NULL && !is_unloaded(), "just checking");
1672 DTRACE_METHOD_UNLOAD_PROBE(method());
1673
1674 // If a JVMTI agent has enabled the CompiledMethodUnload event then
1675 // post the event. Sometime later this nmethod will be made a zombie
1676 // by the sweeper but the Method* will not be valid at that point.
1677 // If the _jmethod_id is null then no load event was ever requested
1678 // so don't bother posting the unload. The main reason for this is
1679 // that the jmethodID is a weak reference to the Method* so if
1680 // it's being unloaded there's no way to look it up since the weak
1681 // ref will have been cleared.
1682 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) {
1683 assert(!unload_reported(), "already unloaded");
1684 JvmtiDeferredEvent event =
1685 JvmtiDeferredEvent::compiled_method_unload_event(this,
1686 _jmethod_id, insts_begin());
1687 if (SafepointSynchronize::is_at_safepoint()) {
1688 // Don't want to take the queueing lock. Add it as pending and
1689 // it will get enqueued later.
1690 JvmtiDeferredEventQueue::add_pending_event(event);
1691 } else {
1692 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1693 JvmtiDeferredEventQueue::enqueue(event);
1694 }
1695 }
1696
1697 // The JVMTI CompiledMethodUnload event can be enabled or disabled at
1698 // any time. As the nmethod is being unloaded now we mark it has
1699 // having the unload event reported - this will ensure that we don't
1700 // attempt to report the event in the unlikely scenario where the
1701 // event is enabled at the time the nmethod is made a zombie.
1702 set_unload_reported();
1703 }
1704
1705 void static clean_ic_if_metadata_is_dead(CompiledIC *ic, BoolObjectClosure *is_alive) {
1706 if (ic->is_icholder_call()) {
1707 // The only exception is compiledICHolder oops which may
1708 // yet be marked below. (We check this further below).
1709 CompiledICHolder* cichk_oop = ic->cached_icholder();
1710 if (cichk_oop->holder_method()->method_holder()->is_loader_alive(is_alive) &&
1711 cichk_oop->holder_klass()->is_loader_alive(is_alive)) {
1712 return;
1713 }
1714 } else {
1715 Metadata* ic_oop = ic->cached_metadata();
1716 if (ic_oop != NULL) {
1717 if (ic_oop->is_klass()) {
1718 if (((Klass*)ic_oop)->is_loader_alive(is_alive)) {
1719 return;
1720 }
1721 } else if (ic_oop->is_method()) {
1722 if (((Method*)ic_oop)->method_holder()->is_loader_alive(is_alive)) {
1723 return;
1724 }
1725 } else {
1726 ShouldNotReachHere();
1727 }
1728 }
1729 }
1730
1731 ic->set_to_clean();
1732 }
1733
1734 // This is called at the end of the strong tracing/marking phase of a
1735 // GC to unload an nmethod if it contains otherwise unreachable
1736 // oops.
1737
1738 void nmethod::do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred) {
1739 // Make sure the oop's ready to receive visitors
1740 assert(!is_zombie() && !is_unloaded(),
1741 "should not call follow on zombie or unloaded nmethod");
1742
1743 // If the method is not entrant then a JMP is plastered over the
1744 // first few bytes. If an oop in the old code was there, that oop
1745 // should not get GC'd. Skip the first few bytes of oops on
1746 // not-entrant methods.
1747 address low_boundary = verified_entry_point();
1748 if (is_not_entrant()) {
1749 low_boundary += NativeJump::instruction_size;
1750 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1751 // (See comment above.)
1752 }
1753
1754 // The RedefineClasses() API can cause the class unloading invariant
1755 // to no longer be true. See jvmtiExport.hpp for details.
1756 // Also, leave a debugging breadcrumb in local flag.
1757 bool a_class_was_redefined = JvmtiExport::has_redefined_a_class();
1758 if (a_class_was_redefined) {
1759 // This set of the unloading_occurred flag is done before the
1760 // call to post_compiled_method_unload() so that the unloading
1761 // of this nmethod is reported.
1762 unloading_occurred = true;
1763 }
1764
1765 // Exception cache
1766 clean_exception_cache(is_alive);
1767
1768 // If class unloading occurred we first iterate over all inline caches and
1769 // clear ICs where the cached oop is referring to an unloaded klass or method.
1770 // The remaining live cached oops will be traversed in the relocInfo::oop_type
1771 // iteration below.
1772 if (unloading_occurred) {
1773 RelocIterator iter(this, low_boundary);
1774 while(iter.next()) {
1775 if (iter.type() == relocInfo::virtual_call_type) {
1776 CompiledIC *ic = CompiledIC_at(&iter);
1777 clean_ic_if_metadata_is_dead(ic, is_alive);
1778 }
1779 }
1780 }
1781
1782 // Compiled code
1783 {
1784 RelocIterator iter(this, low_boundary);
1785 while (iter.next()) {
1786 if (iter.type() == relocInfo::oop_type) {
1787 oop_Relocation* r = iter.oop_reloc();
1788 // In this loop, we must only traverse those oops directly embedded in
1789 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1790 assert(1 == (r->oop_is_immediate()) +
1791 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1792 "oop must be found in exactly one place");
1793 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1794 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) {
1795 return;
1796 }
1797 }
1798 }
1799 }
1800 }
1801
1802
1803 // Scopes
1804 for (oop* p = oops_begin(); p < oops_end(); p++) {
1805 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1806 if (can_unload(is_alive, p, unloading_occurred)) {
1807 return;
1808 }
1809 }
1810
1811 // Ensure that all metadata is still alive
1812 verify_metadata_loaders(low_boundary, is_alive);
1813 }
1814
1815 template <class CompiledICorStaticCall>
1816 static bool clean_if_nmethod_is_unloaded(CompiledICorStaticCall *ic, address addr, BoolObjectClosure *is_alive, nmethod* from) {
1817 // Ok, to lookup references to zombies here
1818 CodeBlob *cb = CodeCache::find_blob_unsafe(addr);
1819 if (cb != NULL && cb->is_nmethod()) {
1820 nmethod* nm = (nmethod*)cb;
1821
1822 if (nm->unloading_clock() != nmethod::global_unloading_clock()) {
1823 // The nmethod has not been processed yet.
1824 return true;
1825 }
1826
1827 // Clean inline caches pointing to both zombie and not_entrant methods
1828 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1829 ic->set_to_clean();
1830 assert(ic->is_clean(), err_msg("nmethod " PTR_FORMAT "not clean %s", from, from->method()->name_and_sig_as_C_string()));
1831 }
1832 }
1833
1834 return false;
1835 }
1836
1837 static bool clean_if_nmethod_is_unloaded(CompiledIC *ic, BoolObjectClosure *is_alive, nmethod* from) {
1838 return clean_if_nmethod_is_unloaded(ic, ic->ic_destination(), is_alive, from);
1839 }
1840
1841 static bool clean_if_nmethod_is_unloaded(CompiledStaticCall *csc, BoolObjectClosure *is_alive, nmethod* from) {
1842 return clean_if_nmethod_is_unloaded(csc, csc->destination(), is_alive, from);
1843 }
1844
1845 bool nmethod::do_unloading_parallel(BoolObjectClosure* is_alive, bool unloading_occurred) {
1846 ResourceMark rm;
1847
1848 // Make sure the oop's ready to receive visitors
1849 assert(!is_zombie() && !is_unloaded(),
1850 "should not call follow on zombie or unloaded nmethod");
1851
1852 // If the method is not entrant then a JMP is plastered over the
1853 // first few bytes. If an oop in the old code was there, that oop
1854 // should not get GC'd. Skip the first few bytes of oops on
1855 // not-entrant methods.
1856 address low_boundary = verified_entry_point();
1857 if (is_not_entrant()) {
1858 low_boundary += NativeJump::instruction_size;
1859 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1860 // (See comment above.)
1861 }
1862
1863 // The RedefineClasses() API can cause the class unloading invariant
1864 // to no longer be true. See jvmtiExport.hpp for details.
1865 // Also, leave a debugging breadcrumb in local flag.
1866 bool a_class_was_redefined = JvmtiExport::has_redefined_a_class();
1867 if (a_class_was_redefined) {
1868 // This set of the unloading_occurred flag is done before the
1869 // call to post_compiled_method_unload() so that the unloading
1870 // of this nmethod is reported.
1871 unloading_occurred = true;
1872 }
1873
1874 // Exception cache
1875 clean_exception_cache(is_alive);
1876
1877 bool is_unloaded = false;
1878 bool postponed = false;
1879
1880 RelocIterator iter(this, low_boundary);
1881 while(iter.next()) {
1882
1883 switch (iter.type()) {
1884
1885 case relocInfo::virtual_call_type:
1886 if (unloading_occurred) {
1887 // If class unloading occurred we first iterate over all inline caches and
1888 // clear ICs where the cached oop is referring to an unloaded klass or method.
1889 clean_ic_if_metadata_is_dead(CompiledIC_at(&iter), is_alive);
1890 }
1891
1892 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
1893 break;
1894
1895 case relocInfo::opt_virtual_call_type:
1896 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
1897 break;
1898
1899 case relocInfo::static_call_type:
1900 postponed |= clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this);
1901 break;
1902
1903 case relocInfo::oop_type:
1904 if (!is_unloaded) {
1905 // Unload check
1906 oop_Relocation* r = iter.oop_reloc();
1907 // Traverse those oops directly embedded in the code.
1908 // Other oops (oop_index>0) are seen as part of scopes_oops.
1909 assert(1 == (r->oop_is_immediate()) +
1910 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1911 "oop must be found in exactly one place");
1912 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1913 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) {
1914 is_unloaded = true;
1915 }
1916 }
1917 }
1918 break;
1919
1920 }
1921 }
1922
1923 if (is_unloaded) {
1924 return postponed;
1925 }
1926
1927 // Scopes
1928 for (oop* p = oops_begin(); p < oops_end(); p++) {
1929 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1930 if (can_unload(is_alive, p, unloading_occurred)) {
1931 is_unloaded = true;
1932 break;
1933 }
1934 }
1935
1936 if (is_unloaded) {
1937 return postponed;
1938 }
1939
1940 // Ensure that all metadata is still alive
1941 verify_metadata_loaders(low_boundary, is_alive);
1942
1943 return postponed;
1944 }
1945
1946 void nmethod::do_unloading_parallel_postponed(BoolObjectClosure* is_alive, bool unloading_occurred) {
1947 ResourceMark rm;
1948
1949 // Make sure the oop's ready to receive visitors
1950 assert(!is_zombie(),
1951 "should not call follow on zombie nmethod");
1952
1953 // If the method is not entrant then a JMP is plastered over the
1954 // first few bytes. If an oop in the old code was there, that oop
1955 // should not get GC'd. Skip the first few bytes of oops on
1956 // not-entrant methods.
1957 address low_boundary = verified_entry_point();
1958 if (is_not_entrant()) {
1959 low_boundary += NativeJump::instruction_size;
1960 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1961 // (See comment above.)
1962 }
1963
1964 RelocIterator iter(this, low_boundary);
1965 while(iter.next()) {
1966
1967 switch (iter.type()) {
1968
1969 case relocInfo::virtual_call_type:
1970 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
1971 break;
1972
1973 case relocInfo::opt_virtual_call_type:
1974 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
1975 break;
1976
1977 case relocInfo::static_call_type:
1978 clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this);
1979 break;
1980 }
1981 }
1982 }
1983
1984 #ifdef ASSERT
1985
1986 class CheckClass : AllStatic {
1987 static BoolObjectClosure* _is_alive;
1988
1989 // Check class_loader is alive for this bit of metadata.
1990 static void check_class(Metadata* md) {
1991 Klass* klass = NULL;
1992 if (md->is_klass()) {
1993 klass = ((Klass*)md);
1994 } else if (md->is_method()) {
1995 klass = ((Method*)md)->method_holder();
1996 } else if (md->is_methodData()) {
1997 klass = ((MethodData*)md)->method()->method_holder();
1998 } else {
1999 md->print();
2000 ShouldNotReachHere();
2001 }
2002 assert(klass->is_loader_alive(_is_alive), "must be alive");
2003 }
2004 public:
2005 static void do_check_class(BoolObjectClosure* is_alive, nmethod* nm) {
2006 assert(SafepointSynchronize::is_at_safepoint(), "this is only ok at safepoint");
2007 _is_alive = is_alive;
2008 nm->metadata_do(check_class);
2009 }
2010 };
2011
2012 // This is called during a safepoint so can use static data
2013 BoolObjectClosure* CheckClass::_is_alive = NULL;
2014 #endif // ASSERT
2015
2016
2017 // Processing of oop references should have been sufficient to keep
2018 // all strong references alive. Any weak references should have been
2019 // cleared as well. Visit all the metadata and ensure that it's
2020 // really alive.
2021 void nmethod::verify_metadata_loaders(address low_boundary, BoolObjectClosure* is_alive) {
2022 #ifdef ASSERT
2023 RelocIterator iter(this, low_boundary);
2024 while (iter.next()) {
2025 // static_stub_Relocations may have dangling references to
2026 // Method*s so trim them out here. Otherwise it looks like
2027 // compiled code is maintaining a link to dead metadata.
2028 address static_call_addr = NULL;
2029 if (iter.type() == relocInfo::opt_virtual_call_type) {
2030 CompiledIC* cic = CompiledIC_at(&iter);
2031 if (!cic->is_call_to_interpreted()) {
2032 static_call_addr = iter.addr();
2033 }
2034 } else if (iter.type() == relocInfo::static_call_type) {
2035 CompiledStaticCall* csc = compiledStaticCall_at(iter.reloc());
2036 if (!csc->is_call_to_interpreted()) {
2037 static_call_addr = iter.addr();
2038 }
2039 }
2040 if (static_call_addr != NULL) {
2041 RelocIterator sciter(this, low_boundary);
2042 while (sciter.next()) {
2043 if (sciter.type() == relocInfo::static_stub_type &&
2044 sciter.static_stub_reloc()->static_call() == static_call_addr) {
2045 sciter.static_stub_reloc()->clear_inline_cache();
2046 }
2047 }
2048 }
2049 }
2050 // Check that the metadata embedded in the nmethod is alive
2051 CheckClass::do_check_class(is_alive, this);
2052 #endif
2053 }
2054
2055
2056 // Iterate over metadata calling this function. Used by RedefineClasses
2057 void nmethod::metadata_do(void f(Metadata*)) {
2058 address low_boundary = verified_entry_point();
2059 if (is_not_entrant()) {
2060 low_boundary += NativeJump::instruction_size;
2061 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
2062 // (See comment above.)
2063 }
2064 {
2065 // Visit all immediate references that are embedded in the instruction stream.
2066 RelocIterator iter(this, low_boundary);
2067 while (iter.next()) {
2068 if (iter.type() == relocInfo::metadata_type ) {
2069 metadata_Relocation* r = iter.metadata_reloc();
2070 // In this lmetadata, we must only follow those metadatas directly embedded in
2071 // the code. Other metadatas (oop_index>0) are seen as part of
2072 // the metadata section below.
2073 assert(1 == (r->metadata_is_immediate()) +
2074 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
2075 "metadata must be found in exactly one place");
2076 if (r->metadata_is_immediate() && r->metadata_value() != NULL) {
2077 Metadata* md = r->metadata_value();
2078 if (md != _method) f(md);
2079 }
2080 } else if (iter.type() == relocInfo::virtual_call_type) {
2081 // Check compiledIC holders associated with this nmethod
2082 CompiledIC *ic = CompiledIC_at(&iter);
2083 if (ic->is_icholder_call()) {
2084 CompiledICHolder* cichk = ic->cached_icholder();
2085 f(cichk->holder_method());
2086 f(cichk->holder_klass());
2087 } else {
2088 Metadata* ic_oop = ic->cached_metadata();
2089 if (ic_oop != NULL) {
2090 f(ic_oop);
2091 }
2092 }
2093 }
2094 }
2095 }
2096
2097 // Visit the metadata section
2098 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
2099 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops
2100 Metadata* md = *p;
2101 f(md);
2102 }
2103
2104 // Call function Method*, not embedded in these other places.
2105 if (_method != NULL) f(_method);
2106 }
2107
2108 void nmethod::oops_do(OopClosure* f, bool allow_zombie) {
2109 // make sure the oops ready to receive visitors
2110 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod");
2111 assert(!is_unloaded(), "should not call follow on unloaded nmethod");
2112
2113 // If the method is not entrant or zombie then a JMP is plastered over the
2114 // first few bytes. If an oop in the old code was there, that oop
2115 // should not get GC'd. Skip the first few bytes of oops on
2116 // not-entrant methods.
2117 address low_boundary = verified_entry_point();
2118 if (is_not_entrant()) {
2119 low_boundary += NativeJump::instruction_size;
2120 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
2121 // (See comment above.)
2122 }
2123
2124 RelocIterator iter(this, low_boundary);
2125
2126 while (iter.next()) {
2127 if (iter.type() == relocInfo::oop_type ) {
2128 oop_Relocation* r = iter.oop_reloc();
2129 // In this loop, we must only follow those oops directly embedded in
2130 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
2131 assert(1 == (r->oop_is_immediate()) +
2132 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
2133 "oop must be found in exactly one place");
2134 if (r->oop_is_immediate() && r->oop_value() != NULL) {
2135 f->do_oop(r->oop_addr());
2136 }
2137 }
2138 }
2139
2140 // Scopes
2141 // This includes oop constants not inlined in the code stream.
2142 for (oop* p = oops_begin(); p < oops_end(); p++) {
2143 if (*p == Universe::non_oop_word()) continue; // skip non-oops
2144 f->do_oop(p);
2145 }
2146 }
2147
2148 #define NMETHOD_SENTINEL ((nmethod*)badAddress)
2149
2150 nmethod* volatile nmethod::_oops_do_mark_nmethods;
2151
2152 // An nmethod is "marked" if its _mark_link is set non-null.
2153 // Even if it is the end of the linked list, it will have a non-null link value,
2154 // as long as it is on the list.
2155 // This code must be MP safe, because it is used from parallel GC passes.
2156 bool nmethod::test_set_oops_do_mark() {
2157 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");
2158 nmethod* observed_mark_link = _oops_do_mark_link;
2159 if (observed_mark_link == NULL) {
2160 // Claim this nmethod for this thread to mark.
2161 observed_mark_link = (nmethod*)
2162 Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_link, NULL);
2163 if (observed_mark_link == NULL) {
2164
2165 // Atomically append this nmethod (now claimed) to the head of the list:
2166 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods;
2167 for (;;) {
2168 nmethod* required_mark_nmethods = observed_mark_nmethods;
2169 _oops_do_mark_link = required_mark_nmethods;
2170 observed_mark_nmethods = (nmethod*)
2171 Atomic::cmpxchg_ptr(this, &_oops_do_mark_nmethods, required_mark_nmethods);
2172 if (observed_mark_nmethods == required_mark_nmethods)
2173 break;
2174 }
2175 // Mark was clear when we first saw this guy.
2176 NOT_PRODUCT(if (TraceScavenge) print_on(tty, "oops_do, mark"));
2177 return false;
2178 }
2179 }
2180 // On fall through, another racing thread marked this nmethod before we did.
2181 return true;
2182 }
2183
2184 void nmethod::oops_do_marking_prologue() {
2185 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("[oops_do_marking_prologue"));
2186 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row");
2187 // We use cmpxchg_ptr instead of regular assignment here because the user
2188 // may fork a bunch of threads, and we need them all to see the same state.
2189 void* observed = Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, NULL);
2190 guarantee(observed == NULL, "no races in this sequential code");
2191 }
2192
2193 void nmethod::oops_do_marking_epilogue() {
2194 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row");
2195 nmethod* cur = _oops_do_mark_nmethods;
2196 while (cur != NMETHOD_SENTINEL) {
2197 assert(cur != NULL, "not NULL-terminated");
2198 nmethod* next = cur->_oops_do_mark_link;
2199 cur->_oops_do_mark_link = NULL;
2200 cur->verify_oop_relocations();
2201 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark"));
2202 cur = next;
2203 }
2204 void* required = _oops_do_mark_nmethods;
2205 void* observed = Atomic::cmpxchg_ptr(NULL, &_oops_do_mark_nmethods, required);
2206 guarantee(observed == required, "no races in this sequential code");
2207 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("oops_do_marking_epilogue]"));
2208 }
2209
2210 class DetectScavengeRoot: public OopClosure {
2211 bool _detected_scavenge_root;
2212 public:
2213 DetectScavengeRoot() : _detected_scavenge_root(false)
2214 { NOT_PRODUCT(_print_nm = NULL); }
2215 bool detected_scavenge_root() { return _detected_scavenge_root; }
2216 virtual void do_oop(oop* p) {
2217 if ((*p) != NULL && (*p)->is_scavengable()) {
2218 NOT_PRODUCT(maybe_print(p));
2219 _detected_scavenge_root = true;
2220 }
2221 }
2222 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2223
2224 #ifndef PRODUCT
2225 nmethod* _print_nm;
2226 void maybe_print(oop* p) {
2227 if (_print_nm == NULL) return;
2228 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root");
2229 tty->print_cr(""PTR_FORMAT"[offset=%d] detected scavengable oop "PTR_FORMAT" (found at "PTR_FORMAT")",
2230 _print_nm, (int)((intptr_t)p - (intptr_t)_print_nm),
2231 (void *)(*p), (intptr_t)p);
2232 (*p)->print();
2233 }
2234 #endif //PRODUCT
2235 };
2236
2237 bool nmethod::detect_scavenge_root_oops() {
2238 DetectScavengeRoot detect_scavenge_root;
2239 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this);
2240 oops_do(&detect_scavenge_root);
2241 return detect_scavenge_root.detected_scavenge_root();
2242 }
2243
2244 // Method that knows how to preserve outgoing arguments at call. This method must be
2245 // called with a frame corresponding to a Java invoke
2246 void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) {
2247 #ifndef SHARK
2248 if (!method()->is_native()) {
2249 SimpleScopeDesc ssd(this, fr.pc());
2250 Bytecode_invoke call(ssd.method(), ssd.bci());
2251 bool has_receiver = call.has_receiver();
2252 bool has_appendix = call.has_appendix();
2253 Symbol* signature = call.signature();
2254 fr.oops_compiled_arguments_do(signature, has_receiver, has_appendix, reg_map, f);
2255 }
2256 #endif // !SHARK
2257 }
2258
2259
2260 oop nmethod::embeddedOop_at(u_char* p) {
2261 RelocIterator iter(this, p, p + 1);
2262 while (iter.next())
2263 if (iter.type() == relocInfo::oop_type) {
2264 return iter.oop_reloc()->oop_value();
2265 }
2266 return NULL;
2267 }
2268
2269
2270 inline bool includes(void* p, void* from, void* to) {
2271 return from <= p && p < to;
2272 }
2273
2274
2275 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
2276 assert(count >= 2, "must be sentinel values, at least");
2277
2278 #ifdef ASSERT
2279 // must be sorted and unique; we do a binary search in find_pc_desc()
2280 int prev_offset = pcs[0].pc_offset();
2281 assert(prev_offset == PcDesc::lower_offset_limit,
2282 "must start with a sentinel");
2283 for (int i = 1; i < count; i++) {
2284 int this_offset = pcs[i].pc_offset();
2285 assert(this_offset > prev_offset, "offsets must be sorted");
2286 prev_offset = this_offset;
2287 }
2288 assert(prev_offset == PcDesc::upper_offset_limit,
2289 "must end with a sentinel");
2290 #endif //ASSERT
2291
2292 // Search for MethodHandle invokes and tag the nmethod.
2293 for (int i = 0; i < count; i++) {
2294 if (pcs[i].is_method_handle_invoke()) {
2295 set_has_method_handle_invokes(true);
2296 break;
2297 }
2298 }
2299 assert(has_method_handle_invokes() == (_deoptimize_mh_offset != -1), "must have deopt mh handler");
2300
2301 int size = count * sizeof(PcDesc);
2302 assert(scopes_pcs_size() >= size, "oob");
2303 memcpy(scopes_pcs_begin(), pcs, size);
2304
2305 // Adjust the final sentinel downward.
2306 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
2307 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
2308 last_pc->set_pc_offset(content_size() + 1);
2309 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
2310 // Fill any rounding gaps with copies of the last record.
2311 last_pc[1] = last_pc[0];
2312 }
2313 // The following assert could fail if sizeof(PcDesc) is not
2314 // an integral multiple of oopSize (the rounding term).
2315 // If it fails, change the logic to always allocate a multiple
2316 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
2317 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
2318 }
2319
2320 void nmethod::copy_scopes_data(u_char* buffer, int size) {
2321 assert(scopes_data_size() >= size, "oob");
2322 memcpy(scopes_data_begin(), buffer, size);
2323 }
2324
2325
2326 #ifdef ASSERT
2327 static PcDesc* linear_search(nmethod* nm, int pc_offset, bool approximate) {
2328 PcDesc* lower = nm->scopes_pcs_begin();
2329 PcDesc* upper = nm->scopes_pcs_end();
2330 lower += 1; // exclude initial sentinel
2331 PcDesc* res = NULL;
2332 for (PcDesc* p = lower; p < upper; p++) {
2333 NOT_PRODUCT(--nmethod_stats.pc_desc_tests); // don't count this call to match_desc
2334 if (match_desc(p, pc_offset, approximate)) {
2335 if (res == NULL)
2336 res = p;
2337 else
2338 res = (PcDesc*) badAddress;
2339 }
2340 }
2341 return res;
2342 }
2343 #endif
2344
2345
2346 // Finds a PcDesc with real-pc equal to "pc"
2347 PcDesc* nmethod::find_pc_desc_internal(address pc, bool approximate) {
2348 address base_address = code_begin();
2349 if ((pc < base_address) ||
2350 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
2351 return NULL; // PC is wildly out of range
2352 }
2353 int pc_offset = (int) (pc - base_address);
2354
2355 // Check the PcDesc cache if it contains the desired PcDesc
2356 // (This as an almost 100% hit rate.)
2357 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
2358 if (res != NULL) {
2359 assert(res == linear_search(this, pc_offset, approximate), "cache ok");
2360 return res;
2361 }
2362
2363 // Fallback algorithm: quasi-linear search for the PcDesc
2364 // Find the last pc_offset less than the given offset.
2365 // The successor must be the required match, if there is a match at all.
2366 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
2367 PcDesc* lower = scopes_pcs_begin();
2368 PcDesc* upper = scopes_pcs_end();
2369 upper -= 1; // exclude final sentinel
2370 if (lower >= upper) return NULL; // native method; no PcDescs at all
2371
2372 #define assert_LU_OK \
2373 /* invariant on lower..upper during the following search: */ \
2374 assert(lower->pc_offset() < pc_offset, "sanity"); \
2375 assert(upper->pc_offset() >= pc_offset, "sanity")
2376 assert_LU_OK;
2377
2378 // Use the last successful return as a split point.
2379 PcDesc* mid = _pc_desc_cache.last_pc_desc();
2380 NOT_PRODUCT(++nmethod_stats.pc_desc_searches);
2381 if (mid->pc_offset() < pc_offset) {
2382 lower = mid;
2383 } else {
2384 upper = mid;
2385 }
2386
2387 // Take giant steps at first (4096, then 256, then 16, then 1)
2388 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
2389 const int RADIX = (1 << LOG2_RADIX);
2390 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
2391 while ((mid = lower + step) < upper) {
2392 assert_LU_OK;
2393 NOT_PRODUCT(++nmethod_stats.pc_desc_searches);
2394 if (mid->pc_offset() < pc_offset) {
2395 lower = mid;
2396 } else {
2397 upper = mid;
2398 break;
2399 }
2400 }
2401 assert_LU_OK;
2402 }
2403
2404 // Sneak up on the value with a linear search of length ~16.
2405 while (true) {
2406 assert_LU_OK;
2407 mid = lower + 1;
2408 NOT_PRODUCT(++nmethod_stats.pc_desc_searches);
2409 if (mid->pc_offset() < pc_offset) {
2410 lower = mid;
2411 } else {
2412 upper = mid;
2413 break;
2414 }
2415 }
2416 #undef assert_LU_OK
2417
2418 if (match_desc(upper, pc_offset, approximate)) {
2419 assert(upper == linear_search(this, pc_offset, approximate), "search ok");
2420 _pc_desc_cache.add_pc_desc(upper);
2421 return upper;
2422 } else {
2423 assert(NULL == linear_search(this, pc_offset, approximate), "search ok");
2424 return NULL;
2425 }
2426 }
2427
2428
2429 void nmethod::check_all_dependencies(DepChange& changes) {
2430 // Checked dependencies are allocated into this ResourceMark
2431 ResourceMark rm;
2432
2433 // Turn off dependency tracing while actually testing dependencies.
2434 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) );
2435
2436 typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash,
2437 &DependencySignature::equals, 11027> DepTable;
2438
2439 DepTable* table = new DepTable();
2440
2441 // Iterate over live nmethods and check dependencies of all nmethods that are not
2442 // marked for deoptimization. A particular dependency is only checked once.
2443 NMethodIterator iter;
2444 while(iter.next()) {
2445 nmethod* nm = iter.method();
2446 // Only notify for live nmethods
2447 if (nm->is_alive() && !nm->is_marked_for_deoptimization()) {
2448 for (Dependencies::DepStream deps(nm); deps.next(); ) {
2449 // Construct abstraction of a dependency.
2450 DependencySignature* current_sig = new DependencySignature(deps);
2451
2452 // Determine if dependency is already checked. table->put(...) returns
2453 // 'true' if the dependency is added (i.e., was not in the hashtable).
2454 if (table->put(*current_sig, 1)) {
2455 if (deps.check_dependency() != NULL) {
2456 // Dependency checking failed. Print out information about the failed
2457 // dependency and finally fail with an assert. We can fail here, since
2458 // dependency checking is never done in a product build.
2459 changes.print();
2460 nm->print();
2461 nm->print_dependencies();
2462 assert(false, "Should have been marked for deoptimization");
2463 }
2464 }
2465 }
2466 }
2467 }
2468 }
2469
2470 bool nmethod::check_dependency_on(DepChange& changes) {
2471 // What has happened:
2472 // 1) a new class dependee has been added
2473 // 2) dependee and all its super classes have been marked
2474 bool found_check = false; // set true if we are upset
2475 for (Dependencies::DepStream deps(this); deps.next(); ) {
2476 // Evaluate only relevant dependencies.
2477 if (deps.spot_check_dependency_at(changes) != NULL) {
2478 found_check = true;
2479 NOT_DEBUG(break);
2480 }
2481 }
2482 return found_check;
2483 }
2484
2485 bool nmethod::is_evol_dependent_on(Klass* dependee) {
2486 InstanceKlass *dependee_ik = InstanceKlass::cast(dependee);
2487 Array<Method*>* dependee_methods = dependee_ik->methods();
2488 for (Dependencies::DepStream deps(this); deps.next(); ) {
2489 if (deps.type() == Dependencies::evol_method) {
2490 Method* method = deps.method_argument(0);
2491 for (int j = 0; j < dependee_methods->length(); j++) {
2492 if (dependee_methods->at(j) == method) {
2493 // RC_TRACE macro has an embedded ResourceMark
2494 RC_TRACE(0x01000000,
2495 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)",
2496 _method->method_holder()->external_name(),
2497 _method->name()->as_C_string(),
2498 _method->signature()->as_C_string(), compile_id(),
2499 method->method_holder()->external_name(),
2500 method->name()->as_C_string(),
2501 method->signature()->as_C_string()));
2502 if (TraceDependencies || LogCompilation)
2503 deps.log_dependency(dependee);
2504 return true;
2505 }
2506 }
2507 }
2508 }
2509 return false;
2510 }
2511
2512 // Called from mark_for_deoptimization, when dependee is invalidated.
2513 bool nmethod::is_dependent_on_method(Method* dependee) {
2514 for (Dependencies::DepStream deps(this); deps.next(); ) {
2515 if (deps.type() != Dependencies::evol_method)
2516 continue;
2517 Method* method = deps.method_argument(0);
2518 if (method == dependee) return true;
2519 }
2520 return false;
2521 }
2522
2523
2524 bool nmethod::is_patchable_at(address instr_addr) {
2525 assert(insts_contains(instr_addr), "wrong nmethod used");
2526 if (is_zombie()) {
2527 // a zombie may never be patched
2528 return false;
2529 }
2530 return true;
2531 }
2532
2533
2534 address nmethod::continuation_for_implicit_exception(address pc) {
2535 // Exception happened outside inline-cache check code => we are inside
2536 // an active nmethod => use cpc to determine a return address
2537 int exception_offset = pc - code_begin();
2538 int cont_offset = ImplicitExceptionTable(this).at( exception_offset );
2539 #ifdef ASSERT
2540 if (cont_offset == 0) {
2541 Thread* thread = ThreadLocalStorage::get_thread_slow();
2542 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
2543 HandleMark hm(thread);
2544 ResourceMark rm(thread);
2545 CodeBlob* cb = CodeCache::find_blob(pc);
2546 assert(cb != NULL && cb == this, "");
2547 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, pc);
2548 print();
2549 method()->print_codes();
2550 print_code();
2551 print_pcs();
2552 }
2553 #endif
2554 if (cont_offset == 0) {
2555 // Let the normal error handling report the exception
2556 return NULL;
2557 }
2558 return code_begin() + cont_offset;
2559 }
2560
2561
2562
2563 void nmethod_init() {
2564 // make sure you didn't forget to adjust the filler fields
2565 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
2566 }
2567
2568
2569 //-------------------------------------------------------------------------------------------
2570
2571
2572 // QQQ might we make this work from a frame??
2573 nmethodLocker::nmethodLocker(address pc) {
2574 CodeBlob* cb = CodeCache::find_blob(pc);
2575 guarantee(cb != NULL && cb->is_nmethod(), "bad pc for a nmethod found");
2576 _nm = (nmethod*)cb;
2577 lock_nmethod(_nm);
2578 }
2579
2580 // Only JvmtiDeferredEvent::compiled_method_unload_event()
2581 // should pass zombie_ok == true.
2582 void nmethodLocker::lock_nmethod(nmethod* nm, bool zombie_ok) {
2583 if (nm == NULL) return;
2584 Atomic::inc(&nm->_lock_count);
2585 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method");
2586 }
2587
2588 void nmethodLocker::unlock_nmethod(nmethod* nm) {
2589 if (nm == NULL) return;
2590 Atomic::dec(&nm->_lock_count);
2591 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock");
2592 }
2593
2594
2595 // -----------------------------------------------------------------------------
2596 // nmethod::get_deopt_original_pc
2597 //
2598 // Return the original PC for the given PC if:
2599 // (a) the given PC belongs to a nmethod and
2600 // (b) it is a deopt PC
2601 address nmethod::get_deopt_original_pc(const frame* fr) {
2602 if (fr->cb() == NULL) return NULL;
2603
2604 nmethod* nm = fr->cb()->as_nmethod_or_null();
2605 if (nm != NULL && nm->is_deopt_pc(fr->pc()))
2606 return nm->get_original_pc(fr);
2607
2608 return NULL;
2609 }
2610
2611
2612 // -----------------------------------------------------------------------------
2613 // MethodHandle
2614
2615 bool nmethod::is_method_handle_return(address return_pc) {
2616 if (!has_method_handle_invokes()) return false;
2617 PcDesc* pd = pc_desc_at(return_pc);
2618 if (pd == NULL)
2619 return false;
2620 return pd->is_method_handle_invoke();
2621 }
2622
2623
2624 // -----------------------------------------------------------------------------
2625 // Verification
2626
2627 class VerifyOopsClosure: public OopClosure {
2628 nmethod* _nm;
2629 bool _ok;
2630 public:
2631 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
2632 bool ok() { return _ok; }
2633 virtual void do_oop(oop* p) {
2634 if ((*p) == NULL || (*p)->is_oop()) return;
2635 if (_ok) {
2636 _nm->print_nmethod(true);
2637 _ok = false;
2638 }
2639 tty->print_cr("*** non-oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)",
2640 (void *)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm));
2641 }
2642 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2643 };
2644
2645 void nmethod::verify() {
2646
2647 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant
2648 // seems odd.
2649
2650 if( is_zombie() || is_not_entrant() )
2651 return;
2652
2653 // Make sure all the entry points are correctly aligned for patching.
2654 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
2655
2656 // assert(method()->is_oop(), "must be valid");
2657
2658 ResourceMark rm;
2659
2660 if (!CodeCache::contains(this)) {
2661 fatal(err_msg("nmethod at " INTPTR_FORMAT " not in zone", this));
2662 }
2663
2664 if(is_native_method() )
2665 return;
2666
2667 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
2668 if (nm != this) {
2669 fatal(err_msg("findNMethod did not find this nmethod (" INTPTR_FORMAT ")",
2670 this));
2671 }
2672
2673 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2674 if (! p->verify(this)) {
2675 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", this);
2676 }
2677 }
2678
2679 VerifyOopsClosure voc(this);
2680 oops_do(&voc);
2681 assert(voc.ok(), "embedded oops must be OK");
2682 verify_scavenge_root_oops();
2683
2684 verify_scopes();
2685 }
2686
2687
2688 void nmethod::verify_interrupt_point(address call_site) {
2689 // Verify IC only when nmethod installation is finished.
2690 bool is_installed = (method()->code() == this) // nmethod is in state 'in_use' and installed
2691 || !this->is_in_use(); // nmethod is installed, but not in 'in_use' state
2692 if (is_installed) {
2693 Thread *cur = Thread::current();
2694 if (CompiledIC_lock->owner() == cur ||
2695 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) &&
2696 SafepointSynchronize::is_at_safepoint())) {
2697 CompiledIC_at(this, call_site);
2698 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
2699 } else {
2700 MutexLocker ml_verify (CompiledIC_lock);
2701 CompiledIC_at(this, call_site);
2702 }
2703 }
2704
2705 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address());
2706 assert(pd != NULL, "PcDesc must exist");
2707 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(),
2708 pd->obj_decode_offset(), pd->should_reexecute(),
2709 pd->return_oop());
2710 !sd->is_top(); sd = sd->sender()) {
2711 sd->verify();
2712 }
2713 }
2714
2715 void nmethod::verify_scopes() {
2716 if( !method() ) return; // Runtime stubs have no scope
2717 if (method()->is_native()) return; // Ignore stub methods.
2718 // iterate through all interrupt point
2719 // and verify the debug information is valid.
2720 RelocIterator iter((nmethod*)this);
2721 while (iter.next()) {
2722 address stub = NULL;
2723 switch (iter.type()) {
2724 case relocInfo::virtual_call_type:
2725 verify_interrupt_point(iter.addr());
2726 break;
2727 case relocInfo::opt_virtual_call_type:
2728 stub = iter.opt_virtual_call_reloc()->static_stub();
2729 verify_interrupt_point(iter.addr());
2730 break;
2731 case relocInfo::static_call_type:
2732 stub = iter.static_call_reloc()->static_stub();
2733 //verify_interrupt_point(iter.addr());
2734 break;
2735 case relocInfo::runtime_call_type:
2736 address destination = iter.reloc()->value();
2737 // Right now there is no way to find out which entries support
2738 // an interrupt point. It would be nice if we had this
2739 // information in a table.
2740 break;
2741 }
2742 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section");
2743 }
2744 }
2745
2746
2747 // -----------------------------------------------------------------------------
2748 // Non-product code
2749 #ifndef PRODUCT
2750
2751 class DebugScavengeRoot: public OopClosure {
2752 nmethod* _nm;
2753 bool _ok;
2754 public:
2755 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { }
2756 bool ok() { return _ok; }
2757 virtual void do_oop(oop* p) {
2758 if ((*p) == NULL || !(*p)->is_scavengable()) return;
2759 if (_ok) {
2760 _nm->print_nmethod(true);
2761 _ok = false;
2762 }
2763 tty->print_cr("*** scavengable oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)",
2764 (void *)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm));
2765 (*p)->print();
2766 }
2767 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2768 };
2769
2770 void nmethod::verify_scavenge_root_oops() {
2771 if (UseG1GC) {
2772 return;
2773 }
2774
2775 if (!on_scavenge_root_list()) {
2776 // Actually look inside, to verify the claim that it's clean.
2777 DebugScavengeRoot debug_scavenge_root(this);
2778 oops_do(&debug_scavenge_root);
2779 if (!debug_scavenge_root.ok())
2780 fatal("found an unadvertised bad scavengable oop in the code cache");
2781 }
2782 assert(scavenge_root_not_marked(), "");
2783 }
2784
2785 #endif // PRODUCT
2786
2787 // Printing operations
2788
2789 void nmethod::print() const {
2790 ResourceMark rm;
2791 ttyLocker ttyl; // keep the following output all in one block
2792
2793 tty->print("Compiled method ");
2794
2795 if (is_compiled_by_c1()) {
2796 tty->print("(c1) ");
2797 } else if (is_compiled_by_c2()) {
2798 tty->print("(c2) ");
2799 } else if (is_compiled_by_shark()) {
2800 tty->print("(shark) ");
2801 } else {
2802 tty->print("(nm) ");
2803 }
2804
2805 print_on(tty, NULL);
2806
2807 if (WizardMode) {
2808 tty->print("((nmethod*) "INTPTR_FORMAT ") ", this);
2809 tty->print(" for method " INTPTR_FORMAT , (address)method());
2810 tty->print(" { ");
2811 if (is_in_use()) tty->print("in_use ");
2812 if (is_not_entrant()) tty->print("not_entrant ");
2813 if (is_zombie()) tty->print("zombie ");
2814 if (is_unloaded()) tty->print("unloaded ");
2815 if (on_scavenge_root_list()) tty->print("scavenge_root ");
2816 tty->print_cr("}:");
2817 }
2818 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2819 (address)this,
2820 (address)this + size(),
2821 size());
2822 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2823 relocation_begin(),
2824 relocation_end(),
2825 relocation_size());
2826 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2827 consts_begin(),
2828 consts_end(),
2829 consts_size());
2830 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2831 insts_begin(),
2832 insts_end(),
2833 insts_size());
2834 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2835 stub_begin(),
2836 stub_end(),
2837 stub_size());
2838 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2839 oops_begin(),
2840 oops_end(),
2841 oops_size());
2842 if (metadata_size () > 0) tty->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2843 metadata_begin(),
2844 metadata_end(),
2845 metadata_size());
2846 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2847 scopes_data_begin(),
2848 scopes_data_end(),
2849 scopes_data_size());
2850 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2851 scopes_pcs_begin(),
2852 scopes_pcs_end(),
2853 scopes_pcs_size());
2854 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2855 dependencies_begin(),
2856 dependencies_end(),
2857 dependencies_size());
2858 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2859 handler_table_begin(),
2860 handler_table_end(),
2861 handler_table_size());
2862 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2863 nul_chk_table_begin(),
2864 nul_chk_table_end(),
2865 nul_chk_table_size());
2866 }
2867
2868 void nmethod::print_code() {
2869 HandleMark hm;
2870 ResourceMark m;
2871 Disassembler::decode(this);
2872 }
2873
2874
2875 #ifndef PRODUCT
2876
2877 void nmethod::print_scopes() {
2878 // Find the first pc desc for all scopes in the code and print it.
2879 ResourceMark rm;
2880 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2881 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
2882 continue;
2883
2884 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
2885 sd->print_on(tty, p);
2886 }
2887 }
2888
2889 void nmethod::print_dependencies() {
2890 ResourceMark rm;
2891 ttyLocker ttyl; // keep the following output all in one block
2892 tty->print_cr("Dependencies:");
2893 for (Dependencies::DepStream deps(this); deps.next(); ) {
2894 deps.print_dependency();
2895 Klass* ctxk = deps.context_type();
2896 if (ctxk != NULL) {
2897 if (ctxk->oop_is_instance() && ((InstanceKlass*)ctxk)->is_dependent_nmethod(this)) {
2898 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name());
2899 }
2900 }
2901 deps.log_dependency(); // put it into the xml log also
2902 }
2903 }
2904
2905
2906 void nmethod::print_relocations() {
2907 ResourceMark m; // in case methods get printed via the debugger
2908 tty->print_cr("relocations:");
2909 RelocIterator iter(this);
2910 iter.print();
2911 if (UseRelocIndex) {
2912 jint* index_end = (jint*)relocation_end() - 1;
2913 jint index_size = *index_end;
2914 jint* index_start = (jint*)( (address)index_end - index_size );
2915 tty->print_cr(" index @" INTPTR_FORMAT ": index_size=%d", index_start, index_size);
2916 if (index_size > 0) {
2917 jint* ip;
2918 for (ip = index_start; ip+2 <= index_end; ip += 2)
2919 tty->print_cr(" (%d %d) addr=" INTPTR_FORMAT " @" INTPTR_FORMAT,
2920 ip[0],
2921 ip[1],
2922 header_end()+ip[0],
2923 relocation_begin()-1+ip[1]);
2924 for (; ip < index_end; ip++)
2925 tty->print_cr(" (%d ?)", ip[0]);
2926 tty->print_cr(" @" INTPTR_FORMAT ": index_size=%d", ip, *ip);
2927 ip++;
2928 tty->print_cr("reloc_end @" INTPTR_FORMAT ":", ip);
2929 }
2930 }
2931 }
2932
2933
2934 void nmethod::print_pcs() {
2935 ResourceMark m; // in case methods get printed via debugger
2936 tty->print_cr("pc-bytecode offsets:");
2937 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2938 p->print(this);
2939 }
2940 }
2941
2942 #endif // PRODUCT
2943
2944 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
2945 RelocIterator iter(this, begin, end);
2946 bool have_one = false;
2947 while (iter.next()) {
2948 have_one = true;
2949 switch (iter.type()) {
2950 case relocInfo::none: return "no_reloc";
2951 case relocInfo::oop_type: {
2952 stringStream st;
2953 oop_Relocation* r = iter.oop_reloc();
2954 oop obj = r->oop_value();
2955 st.print("oop(");
2956 if (obj == NULL) st.print("NULL");
2957 else obj->print_value_on(&st);
2958 st.print(")");
2959 return st.as_string();
2960 }
2961 case relocInfo::metadata_type: {
2962 stringStream st;
2963 metadata_Relocation* r = iter.metadata_reloc();
2964 Metadata* obj = r->metadata_value();
2965 st.print("metadata(");
2966 if (obj == NULL) st.print("NULL");
2967 else obj->print_value_on(&st);
2968 st.print(")");
2969 return st.as_string();
2970 }
2971 case relocInfo::virtual_call_type: return "virtual_call";
2972 case relocInfo::opt_virtual_call_type: return "optimized virtual_call";
2973 case relocInfo::static_call_type: return "static_call";
2974 case relocInfo::static_stub_type: return "static_stub";
2975 case relocInfo::runtime_call_type: return "runtime_call";
2976 case relocInfo::external_word_type: return "external_word";
2977 case relocInfo::internal_word_type: return "internal_word";
2978 case relocInfo::section_word_type: return "section_word";
2979 case relocInfo::poll_type: return "poll";
2980 case relocInfo::poll_return_type: return "poll_return";
2981 case relocInfo::type_mask: return "type_bit_mask";
2982 }
2983 }
2984 return have_one ? "other" : NULL;
2985 }
2986
2987 // Return a the last scope in (begin..end]
2988 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
2989 PcDesc* p = pc_desc_near(begin+1);
2990 if (p != NULL && p->real_pc(this) <= end) {
2991 return new ScopeDesc(this, p->scope_decode_offset(),
2992 p->obj_decode_offset(), p->should_reexecute(),
2993 p->return_oop());
2994 }
2995 return NULL;
2996 }
2997
2998 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const {
2999 if (block_begin == entry_point()) stream->print_cr("[Entry Point]");
3000 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]");
3001 if (block_begin == exception_begin()) stream->print_cr("[Exception Handler]");
3002 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]");
3003 if (block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]");
3004
3005 if (has_method_handle_invokes())
3006 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]");
3007
3008 if (block_begin == consts_begin()) stream->print_cr("[Constants]");
3009
3010 if (block_begin == entry_point()) {
3011 methodHandle m = method();
3012 if (m.not_null()) {
3013 stream->print(" # ");
3014 m->print_value_on(stream);
3015 stream->cr();
3016 }
3017 if (m.not_null() && !is_osr_method()) {
3018 ResourceMark rm;
3019 int sizeargs = m->size_of_parameters();
3020 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
3021 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
3022 {
3023 int sig_index = 0;
3024 if (!m->is_static())
3025 sig_bt[sig_index++] = T_OBJECT; // 'this'
3026 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) {
3027 BasicType t = ss.type();
3028 sig_bt[sig_index++] = t;
3029 if (type2size[t] == 2) {
3030 sig_bt[sig_index++] = T_VOID;
3031 } else {
3032 assert(type2size[t] == 1, "size is 1 or 2");
3033 }
3034 }
3035 assert(sig_index == sizeargs, "");
3036 }
3037 const char* spname = "sp"; // make arch-specific?
3038 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false);
3039 int stack_slot_offset = this->frame_size() * wordSize;
3040 int tab1 = 14, tab2 = 24;
3041 int sig_index = 0;
3042 int arg_index = (m->is_static() ? 0 : -1);
3043 bool did_old_sp = false;
3044 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) {
3045 bool at_this = (arg_index == -1);
3046 bool at_old_sp = false;
3047 BasicType t = (at_this ? T_OBJECT : ss.type());
3048 assert(t == sig_bt[sig_index], "sigs in sync");
3049 if (at_this)
3050 stream->print(" # this: ");
3051 else
3052 stream->print(" # parm%d: ", arg_index);
3053 stream->move_to(tab1);
3054 VMReg fst = regs[sig_index].first();
3055 VMReg snd = regs[sig_index].second();
3056 if (fst->is_reg()) {
3057 stream->print("%s", fst->name());
3058 if (snd->is_valid()) {
3059 stream->print(":%s", snd->name());
3060 }
3061 } else if (fst->is_stack()) {
3062 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
3063 if (offset == stack_slot_offset) at_old_sp = true;
3064 stream->print("[%s+0x%x]", spname, offset);
3065 } else {
3066 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
3067 }
3068 stream->print(" ");
3069 stream->move_to(tab2);
3070 stream->print("= ");
3071 if (at_this) {
3072 m->method_holder()->print_value_on(stream);
3073 } else {
3074 bool did_name = false;
3075 if (!at_this && ss.is_object()) {
3076 Symbol* name = ss.as_symbol_or_null();
3077 if (name != NULL) {
3078 name->print_value_on(stream);
3079 did_name = true;
3080 }
3081 }
3082 if (!did_name)
3083 stream->print("%s", type2name(t));
3084 }
3085 if (at_old_sp) {
3086 stream->print(" (%s of caller)", spname);
3087 did_old_sp = true;
3088 }
3089 stream->cr();
3090 sig_index += type2size[t];
3091 arg_index += 1;
3092 if (!at_this) ss.next();
3093 }
3094 if (!did_old_sp) {
3095 stream->print(" # ");
3096 stream->move_to(tab1);
3097 stream->print("[%s+0x%x]", spname, stack_slot_offset);
3098 stream->print(" (%s of caller)", spname);
3099 stream->cr();
3100 }
3101 }
3102 }
3103 }
3104
3105 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) {
3106 // First, find an oopmap in (begin, end].
3107 // We use the odd half-closed interval so that oop maps and scope descs
3108 // which are tied to the byte after a call are printed with the call itself.
3109 address base = code_begin();
3110 OopMapSet* oms = oop_maps();
3111 if (oms != NULL) {
3112 for (int i = 0, imax = oms->size(); i < imax; i++) {
3113 OopMap* om = oms->at(i);
3114 address pc = base + om->offset();
3115 if (pc > begin) {
3116 if (pc <= end) {
3117 st->move_to(column);
3118 st->print("; ");
3119 om->print_on(st);
3120 }
3121 break;
3122 }
3123 }
3124 }
3125
3126 // Print any debug info present at this pc.
3127 ScopeDesc* sd = scope_desc_in(begin, end);
3128 if (sd != NULL) {
3129 st->move_to(column);
3130 if (sd->bci() == SynchronizationEntryBCI) {
3131 st->print(";*synchronization entry");
3132 } else {
3133 if (sd->method() == NULL) {
3134 st->print("method is NULL");
3135 } else if (sd->method()->is_native()) {
3136 st->print("method is native");
3137 } else {
3138 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci());
3139 st->print(";*%s", Bytecodes::name(bc));
3140 switch (bc) {
3141 case Bytecodes::_invokevirtual:
3142 case Bytecodes::_invokespecial:
3143 case Bytecodes::_invokestatic:
3144 case Bytecodes::_invokeinterface:
3145 {
3146 Bytecode_invoke invoke(sd->method(), sd->bci());
3147 st->print(" ");
3148 if (invoke.name() != NULL)
3149 invoke.name()->print_symbol_on(st);
3150 else
3151 st->print("<UNKNOWN>");
3152 break;
3153 }
3154 case Bytecodes::_getfield:
3155 case Bytecodes::_putfield:
3156 case Bytecodes::_getstatic:
3157 case Bytecodes::_putstatic:
3158 {
3159 Bytecode_field field(sd->method(), sd->bci());
3160 st->print(" ");
3161 if (field.name() != NULL)
3162 field.name()->print_symbol_on(st);
3163 else
3164 st->print("<UNKNOWN>");
3165 }
3166 }
3167 }
3168 }
3169
3170 // Print all scopes
3171 for (;sd != NULL; sd = sd->sender()) {
3172 st->move_to(column);
3173 st->print("; -");
3174 if (sd->method() == NULL) {
3175 st->print("method is NULL");
3176 } else {
3177 sd->method()->print_short_name(st);
3178 }
3179 int lineno = sd->method()->line_number_from_bci(sd->bci());
3180 if (lineno != -1) {
3181 st->print("@%d (line %d)", sd->bci(), lineno);
3182 } else {
3183 st->print("@%d", sd->bci());
3184 }
3185 st->cr();
3186 }
3187 }
3188
3189 // Print relocation information
3190 const char* str = reloc_string_for(begin, end);
3191 if (str != NULL) {
3192 if (sd != NULL) st->cr();
3193 st->move_to(column);
3194 st->print("; {%s}", str);
3195 }
3196 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin());
3197 if (cont_offset != 0) {
3198 st->move_to(column);
3199 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, code_begin() + cont_offset);
3200 }
3201
3202 }
3203
3204 #ifndef PRODUCT
3205
3206 void nmethod::print_value_on(outputStream* st) const {
3207 st->print("nmethod");
3208 print_on(st, NULL);
3209 }
3210
3211 void nmethod::print_calls(outputStream* st) {
3212 RelocIterator iter(this);
3213 while (iter.next()) {
3214 switch (iter.type()) {
3215 case relocInfo::virtual_call_type:
3216 case relocInfo::opt_virtual_call_type: {
3217 VerifyMutexLocker mc(CompiledIC_lock);
3218 CompiledIC_at(&iter)->print();
3219 break;
3220 }
3221 case relocInfo::static_call_type:
3222 st->print_cr("Static call at " INTPTR_FORMAT, iter.reloc()->addr());
3223 compiledStaticCall_at(iter.reloc())->print();
3224 break;
3225 }
3226 }
3227 }
3228
3229 void nmethod::print_handler_table() {
3230 ExceptionHandlerTable(this).print();
3231 }
3232
3233 void nmethod::print_nul_chk_table() {
3234 ImplicitExceptionTable(this).print(code_begin());
3235 }
3236
3237 void nmethod::print_statistics() {
3238 ttyLocker ttyl;
3239 if (xtty != NULL) xtty->head("statistics type='nmethod'");
3240 nmethod_stats.print_native_nmethod_stats();
3241 nmethod_stats.print_nmethod_stats();
3242 DebugInformationRecorder::print_statistics();
3243 nmethod_stats.print_pc_stats();
3244 Dependencies::print_statistics();
3245 if (xtty != NULL) xtty->tail("statistics");
3246 }
3247
3248 #endif // PRODUCT