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
1134 void nmethod::cleanup_inline_caches() {
1135
1136 assert_locked_or_safepoint(CompiledIC_lock);
1137
1138 // If the method is not entrant or zombie then a JMP is plastered over the
1139 // first few bytes. If an oop in the old code was there, that oop
1140 // should not get GC'd. Skip the first few bytes of oops on
1141 // not-entrant methods.
1142 address low_boundary = verified_entry_point();
1143 if (!is_in_use()) {
1144 low_boundary += NativeJump::instruction_size;
1145 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1146 // This means that the low_boundary is going to be a little too high.
1147 // This shouldn't matter, since oops of non-entrant methods are never used.
1148 // In fact, why are we bothering to look at oops in a non-entrant method??
1149 }
1150
1151 // Find all calls in an nmethod, and clear the ones that points to zombie methods
1152 ResourceMark rm;
1153 RelocIterator iter(this, low_boundary);
1154 while(iter.next()) {
1155 switch(iter.type()) {
1156 case relocInfo::virtual_call_type:
1157 case relocInfo::opt_virtual_call_type: {
1158 CompiledIC *ic = CompiledIC_at(&iter);
1159 // Ok, to lookup references to zombies here
1160 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
1161 if( cb != NULL && cb->is_nmethod() ) {
1162 nmethod* nm = (nmethod*)cb;
1163 // Clean inline caches pointing to both zombie and not_entrant methods
1164 if (!nm->is_in_use() || (nm->method()->code() != nm)) ic->set_to_clean();
1165 }
1166 break;
1167 }
1168 case relocInfo::static_call_type: {
1169 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
1170 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
1171 if( cb != NULL && cb->is_nmethod() ) {
1172 nmethod* nm = (nmethod*)cb;
1173 // Clean inline caches pointing to both zombie and not_entrant methods
1174 if (!nm->is_in_use() || (nm->method()->code() != nm)) csc->set_to_clean();
1175 }
1176 break;
1177 }
1178 }
1179 }
1180 }
1181
1182 void nmethod::verify_clean_inline_caches() {
1183 assert_locked_or_safepoint(CompiledIC_lock);
1184
1185 // If the method is not entrant or zombie then a JMP is plastered over the
1186 // first few bytes. If an oop in the old code was there, that oop
1187 // should not get GC'd. Skip the first few bytes of oops on
1188 // not-entrant methods.
1189 address low_boundary = verified_entry_point();
1190 if (!is_in_use()) {
1191 low_boundary += NativeJump::instruction_size;
1192 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1193 // This means that the low_boundary is going to be a little too high.
1194 // This shouldn't matter, since oops of non-entrant methods are never used.
1195 // In fact, why are we bothering to look at oops in a non-entrant method??
1196 }
1197
1198 ResourceMark rm;
1199 RelocIterator iter(this, low_boundary);
1200 while(iter.next()) {
1201 switch(iter.type()) {
1202 case relocInfo::virtual_call_type:
1203 case relocInfo::opt_virtual_call_type: {
1204 CompiledIC *ic = CompiledIC_at(&iter);
1205 // Ok, to lookup references to zombies here
1206 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
1207 if( cb != NULL && cb->is_nmethod() ) {
1208 nmethod* nm = (nmethod*)cb;
1209 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
1210 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1211 assert(ic->is_clean(), "IC should be clean");
1212 }
1213 }
1214 break;
1215 }
1216 case relocInfo::static_call_type: {
1217 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
1218 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->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(csc->is_clean(), "IC should be clean");
1224 }
1225 }
1226 break;
1227 }
1228 }
1229 }
1230 }
1231
1232 int nmethod::verify_icholder_relocations() {
1233 int count = 0;
1234
1235 RelocIterator iter(this);
1236 while(iter.next()) {
1237 if (iter.type() == relocInfo::virtual_call_type) {
1238 if (CompiledIC::is_icholder_call_site(iter.virtual_call_reloc())) {
1239 CompiledIC *ic = CompiledIC_at(&iter);
1240 if (TraceCompiledIC) {
1241 tty->print("noticed icholder " INTPTR_FORMAT " ", p2i(ic->cached_icholder()));
1242 ic->print();
1243 }
1244 assert(ic->cached_icholder() != NULL, "must be non-NULL");
1245 count++;
1246 }
1247 }
1248 }
1249
1250 return count;
1251 }
1252
1253 // This is a private interface with the sweeper.
1254 void nmethod::mark_as_seen_on_stack() {
1255 assert(is_alive(), "Must be an alive method");
1256 // Set the traversal mark to ensure that the sweeper does 2
1257 // cleaning passes before moving to zombie.
1258 set_stack_traversal_mark(NMethodSweeper::traversal_count());
1259 }
1260
1261 // Tell if a non-entrant method can be converted to a zombie (i.e.,
1262 // there are no activations on the stack, not in use by the VM,
1263 // and not in use by the ServiceThread)
1264 bool nmethod::can_not_entrant_be_converted() {
1265 assert(is_not_entrant(), "must be a non-entrant method");
1266
1267 // Since the nmethod sweeper only does partial sweep the sweeper's traversal
1268 // count can be greater than the stack traversal count before it hits the
1269 // nmethod for the second time.
1270 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count() &&
1271 !is_locked_by_vm();
1272 }
1273
1274 void nmethod::inc_decompile_count() {
1275 if (!is_compiled_by_c2()) return;
1276 // Could be gated by ProfileTraps, but do not bother...
1277 Method* m = method();
1278 if (m == NULL) return;
1279 MethodData* mdo = m->method_data();
1280 if (mdo == NULL) return;
1281 // There is a benign race here. See comments in methodData.hpp.
1282 mdo->inc_decompile_count();
1283 }
1284
1285 void nmethod::increase_unloading_clock() {
1286 _global_unloading_clock++;
1287 if (_global_unloading_clock == 0) {
1288 // _nmethods are allocated with _unloading_clock == 0,
1289 // so 0 is never used as a clock value.
1290 _global_unloading_clock = 1;
1291 }
1292 }
1293
1294 void nmethod::set_unloading_clock(unsigned char unloading_clock) {
1295 OrderAccess::release_store((volatile jubyte*)&_unloading_clock, unloading_clock);
1296 }
1297
1298 unsigned char nmethod::unloading_clock() {
1299 return (unsigned char)OrderAccess::load_acquire((volatile jubyte*)&_unloading_clock);
1300 }
1301
1302 void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) {
1303
1304 post_compiled_method_unload();
1305
1306 // Since this nmethod is being unloaded, make sure that dependencies
1307 // recorded in instanceKlasses get flushed and pass non-NULL closure to
1308 // indicate that this work is being done during a GC.
1309 assert(Universe::heap()->is_gc_active(), "should only be called during gc");
1310 assert(is_alive != NULL, "Should be non-NULL");
1311 // A non-NULL is_alive closure indicates that this is being called during GC.
1312 flush_dependencies(is_alive);
1313
1314 // Break cycle between nmethod & method
1315 if (TraceClassUnloading && WizardMode) {
1316 tty->print_cr("[Class unloading: Making nmethod " INTPTR_FORMAT
1317 " unloadable], Method*(" INTPTR_FORMAT
1318 "), cause(" INTPTR_FORMAT ")",
1319 this, (address)_method, (address)cause);
1320 if (!Universe::heap()->is_gc_active())
1321 cause->klass()->print();
1322 }
1323 // Unlink the osr method, so we do not look this up again
1324 if (is_osr_method()) {
1325 invalidate_osr_method();
1326 }
1327 // If _method is already NULL the Method* is about to be unloaded,
1328 // so we don't have to break the cycle. Note that it is possible to
1329 // have the Method* live here, in case we unload the nmethod because
1330 // it is pointing to some oop (other than the Method*) being unloaded.
1331 if (_method != NULL) {
1332 // OSR methods point to the Method*, but the Method* does not
1333 // point back!
1334 if (_method->code() == this) {
1335 _method->clear_code(); // Break a cycle
1336 }
1337 _method = NULL; // Clear the method of this dead nmethod
1338 }
1339 // Make the class unloaded - i.e., change state and notify sweeper
1340 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
1341 if (is_in_use()) {
1342 // Transitioning directly from live to unloaded -- so
1343 // we need to force a cache clean-up; remember this
1344 // for later on.
1345 CodeCache::set_needs_cache_clean(true);
1346 }
1347
1348 // Unregister must be done before the state change
1349 Universe::heap()->unregister_nmethod(this);
1350
1351 _state = unloaded;
1352
1353 // Log the unloading.
1354 log_state_change();
1355
1356 // The Method* is gone at this point
1357 assert(_method == NULL, "Tautology");
1358
1359 set_osr_link(NULL);
1360 //set_scavenge_root_link(NULL); // done by prune_scavenge_root_nmethods
1361 NMethodSweeper::report_state_change(this);
1362 }
1363
1364 void nmethod::invalidate_osr_method() {
1365 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
1366 // Remove from list of active nmethods
1367 if (method() != NULL)
1368 method()->method_holder()->remove_osr_nmethod(this);
1369 }
1370
1371 void nmethod::log_state_change() const {
1372 if (LogCompilation) {
1373 if (xtty != NULL) {
1374 ttyLocker ttyl; // keep the following output all in one block
1375 if (_state == unloaded) {
1376 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'",
1377 os::current_thread_id());
1378 } else {
1379 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s",
1380 os::current_thread_id(),
1381 (_state == zombie ? " zombie='1'" : ""));
1382 }
1383 log_identity(xtty);
1384 xtty->stamp();
1385 xtty->end_elem();
1386 }
1387 }
1388 if (PrintCompilation && _state != unloaded) {
1389 print_on(tty, _state == zombie ? "made zombie" : "made not entrant");
1390 }
1391 }
1392
1393 /**
1394 * Common functionality for both make_not_entrant and make_zombie
1395 */
1396 bool nmethod::make_not_entrant_or_zombie(unsigned int state) {
1397 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant");
1398 assert(!is_zombie(), "should not already be a zombie");
1399
1400 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below.
1401 nmethodLocker nml(this);
1402 methodHandle the_method(method());
1403 No_Safepoint_Verifier nsv;
1404
1405 // during patching, depending on the nmethod state we must notify the GC that
1406 // code has been unloaded, unregistering it. We cannot do this right while
1407 // holding the Patching_lock because we need to use the CodeCache_lock. This
1408 // would be prone to deadlocks.
1409 // This flag is used to remember whether we need to later lock and unregister.
1410 bool nmethod_needs_unregister = false;
1411
1412 {
1413 // invalidate osr nmethod before acquiring the patching lock since
1414 // they both acquire leaf locks and we don't want a deadlock.
1415 // This logic is equivalent to the logic below for patching the
1416 // verified entry point of regular methods.
1417 if (is_osr_method()) {
1418 // this effectively makes the osr nmethod not entrant
1419 invalidate_osr_method();
1420 }
1421
1422 // Enter critical section. Does not block for safepoint.
1423 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1424
1425 if (_state == state) {
1426 // another thread already performed this transition so nothing
1427 // to do, but return false to indicate this.
1428 return false;
1429 }
1430
1431 // The caller can be calling the method statically or through an inline
1432 // cache call.
1433 if (!is_osr_method() && !is_not_entrant()) {
1434 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
1435 SharedRuntime::get_handle_wrong_method_stub());
1436 }
1437
1438 if (is_in_use()) {
1439 // It's a true state change, so mark the method as decompiled.
1440 // Do it only for transition from alive.
1441 inc_decompile_count();
1442 }
1443
1444 // If the state is becoming a zombie, signal to unregister the nmethod with
1445 // the heap.
1446 // This nmethod may have already been unloaded during a full GC.
1447 if ((state == zombie) && !is_unloaded()) {
1448 nmethod_needs_unregister = true;
1449 }
1450
1451 // Must happen before state change. Otherwise we have a race condition in
1452 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately
1453 // transition its state from 'not_entrant' to 'zombie' without having to wait
1454 // for stack scanning.
1455 if (state == not_entrant) {
1456 mark_as_seen_on_stack();
1457 OrderAccess::storestore();
1458 }
1459
1460 // Change state
1461 _state = state;
1462
1463 // Log the transition once
1464 log_state_change();
1465
1466 // Remove nmethod from method.
1467 // We need to check if both the _code and _from_compiled_code_entry_point
1468 // refer to this nmethod because there is a race in setting these two fields
1469 // in Method* as seen in bugid 4947125.
1470 // If the vep() points to the zombie nmethod, the memory for the nmethod
1471 // could be flushed and the compiler and vtable stubs could still call
1472 // through it.
1473 if (method() != NULL && (method()->code() == this ||
1474 method()->from_compiled_entry() == verified_entry_point())) {
1475 HandleMark hm;
1476 method()->clear_code();
1477 }
1478 } // leave critical region under Patching_lock
1479
1480 // When the nmethod becomes zombie it is no longer alive so the
1481 // dependencies must be flushed. nmethods in the not_entrant
1482 // state will be flushed later when the transition to zombie
1483 // happens or they get unloaded.
1484 if (state == zombie) {
1485 {
1486 // Flushing dependecies must be done before any possible
1487 // safepoint can sneak in, otherwise the oops used by the
1488 // dependency logic could have become stale.
1489 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1490 if (nmethod_needs_unregister) {
1491 Universe::heap()->unregister_nmethod(this);
1492 }
1493 flush_dependencies(NULL);
1494 }
1495
1496 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload
1497 // event and it hasn't already been reported for this nmethod then
1498 // report it now. The event may have been reported earilier if the GC
1499 // marked it for unloading). JvmtiDeferredEventQueue support means
1500 // we no longer go to a safepoint here.
1501 post_compiled_method_unload();
1502
1503 #ifdef ASSERT
1504 // It's no longer safe to access the oops section since zombie
1505 // nmethods aren't scanned for GC.
1506 _oops_are_stale = true;
1507 #endif
1508 // the Method may be reclaimed by class unloading now that the
1509 // nmethod is in zombie state
1510 set_method(NULL);
1511 } else {
1512 assert(state == not_entrant, "other cases may need to be handled differently");
1513 }
1514
1515 if (TraceCreateZombies) {
1516 tty->print_cr("nmethod <" INTPTR_FORMAT "> code made %s", this, (state == not_entrant) ? "not entrant" : "zombie");
1517 }
1518
1519 NMethodSweeper::report_state_change(this);
1520 return true;
1521 }
1522
1523 void nmethod::flush() {
1524 // Note that there are no valid oops in the nmethod anymore.
1525 assert(is_zombie() || (is_osr_method() && is_unloaded()), "must be a zombie method");
1526 assert(is_marked_for_reclamation() || (is_osr_method() && is_unloaded()), "must be marked for reclamation");
1527
1528 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed");
1529 assert_locked_or_safepoint(CodeCache_lock);
1530
1531 // completely deallocate this method
1532 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, this);
1533 if (PrintMethodFlushing) {
1534 tty->print_cr("*flushing nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT "/Free CodeCache:" SIZE_FORMAT "Kb",
1535 _compile_id, this, CodeCache::nof_blobs(), CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(_comp_level))/1024);
1536 }
1537
1538 // We need to deallocate any ExceptionCache data.
1539 // Note that we do not need to grab the nmethod lock for this, it
1540 // better be thread safe if we're disposing of it!
1541 ExceptionCache* ec = exception_cache();
1542 set_exception_cache(NULL);
1543 while(ec != NULL) {
1544 ExceptionCache* next = ec->next();
1545 delete ec;
1546 ec = next;
1547 }
1548
1549 if (on_scavenge_root_list()) {
1550 CodeCache::drop_scavenge_root_nmethod(this);
1551 }
1552
1553 #ifdef SHARK
1554 ((SharkCompiler *) compiler())->free_compiled_method(insts_begin());
1555 #endif // SHARK
1556
1557 ((CodeBlob*)(this))->flush();
1558
1559 CodeCache::free(this);
1560 }
1561
1562 //
1563 // Notify all classes this nmethod is dependent on that it is no
1564 // longer dependent. This should only be called in two situations.
1565 // First, when a nmethod transitions to a zombie all dependents need
1566 // to be clear. Since zombification happens at a safepoint there's no
1567 // synchronization issues. The second place is a little more tricky.
1568 // During phase 1 of mark sweep class unloading may happen and as a
1569 // result some nmethods may get unloaded. In this case the flushing
1570 // of dependencies must happen during phase 1 since after GC any
1571 // dependencies in the unloaded nmethod won't be updated, so
1572 // traversing the dependency information in unsafe. In that case this
1573 // function is called with a non-NULL argument and this function only
1574 // notifies instanceKlasses that are reachable
1575
1576 void nmethod::flush_dependencies(BoolObjectClosure* is_alive) {
1577 assert_locked_or_safepoint(CodeCache_lock);
1578 assert(Universe::heap()->is_gc_active() == (is_alive != NULL),
1579 "is_alive is non-NULL if and only if we are called during GC");
1580 if (!has_flushed_dependencies()) {
1581 set_has_flushed_dependencies();
1582 for (Dependencies::DepStream deps(this); deps.next(); ) {
1583 Klass* klass = deps.context_type();
1584 if (klass == NULL) continue; // ignore things like evol_method
1585
1586 // During GC the is_alive closure is non-NULL, and is used to
1587 // determine liveness of dependees that need to be updated.
1588 if (is_alive == NULL || klass->is_loader_alive(is_alive)) {
1589 InstanceKlass::cast(klass)->remove_dependent_nmethod(this);
1590 }
1591 }
1592 }
1593 }
1594
1595
1596 // If this oop is not live, the nmethod can be unloaded.
1597 bool nmethod::can_unload(BoolObjectClosure* is_alive, oop* root, bool unloading_occurred) {
1598 assert(root != NULL, "just checking");
1599 oop obj = *root;
1600 if (obj == NULL || is_alive->do_object_b(obj)) {
1601 return false;
1602 }
1603
1604 // If ScavengeRootsInCode is true, an nmethod might be unloaded
1605 // simply because one of its constant oops has gone dead.
1606 // No actual classes need to be unloaded in order for this to occur.
1607 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading");
1608 make_unloaded(is_alive, obj);
1609 return true;
1610 }
1611
1612 // ------------------------------------------------------------------
1613 // post_compiled_method_load_event
1614 // new method for install_code() path
1615 // Transfer information from compilation to jvmti
1616 void nmethod::post_compiled_method_load_event() {
1617
1618 Method* moop = method();
1619 HOTSPOT_COMPILED_METHOD_LOAD(
1620 (char *) moop->klass_name()->bytes(),
1621 moop->klass_name()->utf8_length(),
1622 (char *) moop->name()->bytes(),
1623 moop->name()->utf8_length(),
1624 (char *) moop->signature()->bytes(),
1625 moop->signature()->utf8_length(),
1626 insts_begin(), insts_size());
1627
1628 if (JvmtiExport::should_post_compiled_method_load() ||
1629 JvmtiExport::should_post_compiled_method_unload()) {
1630 get_and_cache_jmethod_id();
1631 }
1632
1633 if (JvmtiExport::should_post_compiled_method_load()) {
1634 // Let the Service thread (which is a real Java thread) post the event
1635 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1636 JvmtiDeferredEventQueue::enqueue(
1637 JvmtiDeferredEvent::compiled_method_load_event(this));
1638 }
1639 }
1640
1641 jmethodID nmethod::get_and_cache_jmethod_id() {
1642 if (_jmethod_id == NULL) {
1643 // Cache the jmethod_id since it can no longer be looked up once the
1644 // method itself has been marked for unloading.
1645 _jmethod_id = method()->jmethod_id();
1646 }
1647 return _jmethod_id;
1648 }
1649
1650 void nmethod::post_compiled_method_unload() {
1651 if (unload_reported()) {
1652 // During unloading we transition to unloaded and then to zombie
1653 // and the unloading is reported during the first transition.
1654 return;
1655 }
1656
1657 assert(_method != NULL && !is_unloaded(), "just checking");
1658 DTRACE_METHOD_UNLOAD_PROBE(method());
1659
1660 // If a JVMTI agent has enabled the CompiledMethodUnload event then
1661 // post the event. Sometime later this nmethod will be made a zombie
1662 // by the sweeper but the Method* will not be valid at that point.
1663 // If the _jmethod_id is null then no load event was ever requested
1664 // so don't bother posting the unload. The main reason for this is
1665 // that the jmethodID is a weak reference to the Method* so if
1666 // it's being unloaded there's no way to look it up since the weak
1667 // ref will have been cleared.
1668 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) {
1669 assert(!unload_reported(), "already unloaded");
1670 JvmtiDeferredEvent event =
1671 JvmtiDeferredEvent::compiled_method_unload_event(this,
1672 _jmethod_id, insts_begin());
1673 if (SafepointSynchronize::is_at_safepoint()) {
1674 // Don't want to take the queueing lock. Add it as pending and
1675 // it will get enqueued later.
1676 JvmtiDeferredEventQueue::add_pending_event(event);
1677 } else {
1678 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1679 JvmtiDeferredEventQueue::enqueue(event);
1680 }
1681 }
1682
1683 // The JVMTI CompiledMethodUnload event can be enabled or disabled at
1684 // any time. As the nmethod is being unloaded now we mark it has
1685 // having the unload event reported - this will ensure that we don't
1686 // attempt to report the event in the unlikely scenario where the
1687 // event is enabled at the time the nmethod is made a zombie.
1688 set_unload_reported();
1689 }
1690
1691 void static clean_ic_if_metadata_is_dead(CompiledIC *ic, BoolObjectClosure *is_alive) {
1692 if (ic->is_icholder_call()) {
1693 // The only exception is compiledICHolder oops which may
1694 // yet be marked below. (We check this further below).
1695 CompiledICHolder* cichk_oop = ic->cached_icholder();
1696 if (cichk_oop->holder_method()->method_holder()->is_loader_alive(is_alive) &&
1697 cichk_oop->holder_klass()->is_loader_alive(is_alive)) {
1698 return;
1699 }
1700 } else {
1701 Metadata* ic_oop = ic->cached_metadata();
1702 if (ic_oop != NULL) {
1703 if (ic_oop->is_klass()) {
1704 if (((Klass*)ic_oop)->is_loader_alive(is_alive)) {
1705 return;
1706 }
1707 } else if (ic_oop->is_method()) {
1708 if (((Method*)ic_oop)->method_holder()->is_loader_alive(is_alive)) {
1709 return;
1710 }
1711 } else {
1712 ShouldNotReachHere();
1713 }
1714 }
1715 }
1716
1717 ic->set_to_clean();
1718 }
1719
1720 // This is called at the end of the strong tracing/marking phase of a
1721 // GC to unload an nmethod if it contains otherwise unreachable
1722 // oops.
1723
1724 void nmethod::do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred) {
1725 // Make sure the oop's ready to receive visitors
1726 assert(!is_zombie() && !is_unloaded(),
1727 "should not call follow on zombie or unloaded nmethod");
1728
1729 // If the method is not entrant then a JMP is plastered over the
1730 // first few bytes. If an oop in the old code was there, that oop
1731 // should not get GC'd. Skip the first few bytes of oops on
1732 // not-entrant methods.
1733 address low_boundary = verified_entry_point();
1734 if (is_not_entrant()) {
1735 low_boundary += NativeJump::instruction_size;
1736 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1737 // (See comment above.)
1738 }
1739
1740 // The RedefineClasses() API can cause the class unloading invariant
1741 // to no longer be true. See jvmtiExport.hpp for details.
1742 // Also, leave a debugging breadcrumb in local flag.
1743 bool a_class_was_redefined = JvmtiExport::has_redefined_a_class();
1744 if (a_class_was_redefined) {
1745 // This set of the unloading_occurred flag is done before the
1746 // call to post_compiled_method_unload() so that the unloading
1747 // of this nmethod is reported.
1748 unloading_occurred = true;
1749 }
1750
1751 // Exception cache
1752 clean_exception_cache(is_alive);
1753
1754 // If class unloading occurred we first iterate over all inline caches and
1755 // clear ICs where the cached oop is referring to an unloaded klass or method.
1756 // The remaining live cached oops will be traversed in the relocInfo::oop_type
1757 // iteration below.
1758 if (unloading_occurred) {
1759 RelocIterator iter(this, low_boundary);
1760 while(iter.next()) {
1761 if (iter.type() == relocInfo::virtual_call_type) {
1762 CompiledIC *ic = CompiledIC_at(&iter);
1763 clean_ic_if_metadata_is_dead(ic, is_alive);
1764 }
1765 }
1766 }
1767
1768 // Compiled code
1769 {
1770 RelocIterator iter(this, low_boundary);
1771 while (iter.next()) {
1772 if (iter.type() == relocInfo::oop_type) {
1773 oop_Relocation* r = iter.oop_reloc();
1774 // In this loop, we must only traverse those oops directly embedded in
1775 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1776 assert(1 == (r->oop_is_immediate()) +
1777 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1778 "oop must be found in exactly one place");
1779 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1780 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) {
1781 return;
1782 }
1783 }
1784 }
1785 }
1786 }
1787
1788
1789 // Scopes
1790 for (oop* p = oops_begin(); p < oops_end(); p++) {
1791 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1792 if (can_unload(is_alive, p, unloading_occurred)) {
1793 return;
1794 }
1795 }
1796
1797 // Ensure that all metadata is still alive
1798 verify_metadata_loaders(low_boundary, is_alive);
1799 }
1800
1801 template <class CompiledICorStaticCall>
1802 static bool clean_if_nmethod_is_unloaded(CompiledICorStaticCall *ic, address addr, BoolObjectClosure *is_alive, nmethod* from) {
1803 // Ok, to lookup references to zombies here
1804 CodeBlob *cb = CodeCache::find_blob_unsafe(addr);
1805 if (cb != NULL && cb->is_nmethod()) {
1806 nmethod* nm = (nmethod*)cb;
1807
1808 if (nm->unloading_clock() != nmethod::global_unloading_clock()) {
1809 // The nmethod has not been processed yet.
1810 return true;
1811 }
1812
1813 // Clean inline caches pointing to both zombie and not_entrant methods
1814 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1815 ic->set_to_clean();
1816 assert(ic->is_clean(), err_msg("nmethod " PTR_FORMAT "not clean %s", from, from->method()->name_and_sig_as_C_string()));
1817 }
1818 }
1819
1820 return false;
1821 }
1822
1823 static bool clean_if_nmethod_is_unloaded(CompiledIC *ic, BoolObjectClosure *is_alive, nmethod* from) {
1824 return clean_if_nmethod_is_unloaded(ic, ic->ic_destination(), is_alive, from);
1825 }
1826
1827 static bool clean_if_nmethod_is_unloaded(CompiledStaticCall *csc, BoolObjectClosure *is_alive, nmethod* from) {
1828 return clean_if_nmethod_is_unloaded(csc, csc->destination(), is_alive, from);
1829 }
1830
1831 bool nmethod::do_unloading_parallel(BoolObjectClosure* is_alive, bool unloading_occurred) {
1832 ResourceMark rm;
1833
1834 // Make sure the oop's ready to receive visitors
1835 assert(!is_zombie() && !is_unloaded(),
1836 "should not call follow on zombie or unloaded nmethod");
1837
1838 // If the method is not entrant then a JMP is plastered over the
1839 // first few bytes. If an oop in the old code was there, that oop
1840 // should not get GC'd. Skip the first few bytes of oops on
1841 // not-entrant methods.
1842 address low_boundary = verified_entry_point();
1843 if (is_not_entrant()) {
1844 low_boundary += NativeJump::instruction_size;
1845 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1846 // (See comment above.)
1847 }
1848
1849 // The RedefineClasses() API can cause the class unloading invariant
1850 // to no longer be true. See jvmtiExport.hpp for details.
1851 // Also, leave a debugging breadcrumb in local flag.
1852 bool a_class_was_redefined = JvmtiExport::has_redefined_a_class();
1853 if (a_class_was_redefined) {
1854 // This set of the unloading_occurred flag is done before the
1855 // call to post_compiled_method_unload() so that the unloading
1856 // of this nmethod is reported.
1857 unloading_occurred = true;
1858 }
1859
1860 // Exception cache
1861 clean_exception_cache(is_alive);
1862
1863 bool is_unloaded = false;
1864 bool postponed = false;
1865
1866 RelocIterator iter(this, low_boundary);
1867 while(iter.next()) {
1868
1869 switch (iter.type()) {
1870
1871 case relocInfo::virtual_call_type:
1872 if (unloading_occurred) {
1873 // If class unloading occurred we first iterate over all inline caches and
1874 // clear ICs where the cached oop is referring to an unloaded klass or method.
1875 clean_ic_if_metadata_is_dead(CompiledIC_at(&iter), is_alive);
1876 }
1877
1878 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
1879 break;
1880
1881 case relocInfo::opt_virtual_call_type:
1882 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
1883 break;
1884
1885 case relocInfo::static_call_type:
1886 postponed |= clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this);
1887 break;
1888
1889 case relocInfo::oop_type:
1890 if (!is_unloaded) {
1891 // Unload check
1892 oop_Relocation* r = iter.oop_reloc();
1893 // Traverse those oops directly embedded in the code.
1894 // Other oops (oop_index>0) are seen as part of scopes_oops.
1895 assert(1 == (r->oop_is_immediate()) +
1896 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1897 "oop must be found in exactly one place");
1898 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1899 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) {
1900 is_unloaded = true;
1901 }
1902 }
1903 }
1904 break;
1905
1906 }
1907 }
1908
1909 if (is_unloaded) {
1910 return postponed;
1911 }
1912
1913 // Scopes
1914 for (oop* p = oops_begin(); p < oops_end(); p++) {
1915 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1916 if (can_unload(is_alive, p, unloading_occurred)) {
1917 is_unloaded = true;
1918 break;
1919 }
1920 }
1921
1922 if (is_unloaded) {
1923 return postponed;
1924 }
1925
1926 // Ensure that all metadata is still alive
1927 verify_metadata_loaders(low_boundary, is_alive);
1928
1929 return postponed;
1930 }
1931
1932 void nmethod::do_unloading_parallel_postponed(BoolObjectClosure* is_alive, bool unloading_occurred) {
1933 ResourceMark rm;
1934
1935 // Make sure the oop's ready to receive visitors
1936 assert(!is_zombie(),
1937 "should not call follow on zombie nmethod");
1938
1939 // If the method is not entrant then a JMP is plastered over the
1940 // first few bytes. If an oop in the old code was there, that oop
1941 // should not get GC'd. Skip the first few bytes of oops on
1942 // not-entrant methods.
1943 address low_boundary = verified_entry_point();
1944 if (is_not_entrant()) {
1945 low_boundary += NativeJump::instruction_size;
1946 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1947 // (See comment above.)
1948 }
1949
1950 RelocIterator iter(this, low_boundary);
1951 while(iter.next()) {
1952
1953 switch (iter.type()) {
1954
1955 case relocInfo::virtual_call_type:
1956 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
1957 break;
1958
1959 case relocInfo::opt_virtual_call_type:
1960 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
1961 break;
1962
1963 case relocInfo::static_call_type:
1964 clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this);
1965 break;
1966 }
1967 }
1968 }
1969
1970 #ifdef ASSERT
1971
1972 class CheckClass : AllStatic {
1973 static BoolObjectClosure* _is_alive;
1974
1975 // Check class_loader is alive for this bit of metadata.
1976 static void check_class(Metadata* md) {
1977 Klass* klass = NULL;
1978 if (md->is_klass()) {
1979 klass = ((Klass*)md);
1980 } else if (md->is_method()) {
1981 klass = ((Method*)md)->method_holder();
1982 } else if (md->is_methodData()) {
1983 klass = ((MethodData*)md)->method()->method_holder();
1984 } else {
1985 md->print();
1986 ShouldNotReachHere();
1987 }
1988 assert(klass->is_loader_alive(_is_alive), "must be alive");
1989 }
1990 public:
1991 static void do_check_class(BoolObjectClosure* is_alive, nmethod* nm) {
1992 assert(SafepointSynchronize::is_at_safepoint(), "this is only ok at safepoint");
1993 _is_alive = is_alive;
1994 nm->metadata_do(check_class);
1995 }
1996 };
1997
1998 // This is called during a safepoint so can use static data
1999 BoolObjectClosure* CheckClass::_is_alive = NULL;
2000 #endif // ASSERT
2001
2002
2003 // Processing of oop references should have been sufficient to keep
2004 // all strong references alive. Any weak references should have been
2005 // cleared as well. Visit all the metadata and ensure that it's
2006 // really alive.
2007 void nmethod::verify_metadata_loaders(address low_boundary, BoolObjectClosure* is_alive) {
2008 #ifdef ASSERT
2009 RelocIterator iter(this, low_boundary);
2010 while (iter.next()) {
2011 // static_stub_Relocations may have dangling references to
2012 // Method*s so trim them out here. Otherwise it looks like
2013 // compiled code is maintaining a link to dead metadata.
2014 address static_call_addr = NULL;
2015 if (iter.type() == relocInfo::opt_virtual_call_type) {
2016 CompiledIC* cic = CompiledIC_at(&iter);
2017 if (!cic->is_call_to_interpreted()) {
2018 static_call_addr = iter.addr();
2019 }
2020 } else if (iter.type() == relocInfo::static_call_type) {
2021 CompiledStaticCall* csc = compiledStaticCall_at(iter.reloc());
2022 if (!csc->is_call_to_interpreted()) {
2023 static_call_addr = iter.addr();
2024 }
2025 }
2026 if (static_call_addr != NULL) {
2027 RelocIterator sciter(this, low_boundary);
2028 while (sciter.next()) {
2029 if (sciter.type() == relocInfo::static_stub_type &&
2030 sciter.static_stub_reloc()->static_call() == static_call_addr) {
2031 sciter.static_stub_reloc()->clear_inline_cache();
2032 }
2033 }
2034 }
2035 }
2036 // Check that the metadata embedded in the nmethod is alive
2037 CheckClass::do_check_class(is_alive, this);
2038 #endif
2039 }
2040
2041
2042 // Iterate over metadata calling this function. Used by RedefineClasses
2043 void nmethod::metadata_do(void f(Metadata*)) {
2044 address low_boundary = verified_entry_point();
2045 if (is_not_entrant()) {
2046 low_boundary += NativeJump::instruction_size;
2047 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
2048 // (See comment above.)
2049 }
2050 {
2051 // Visit all immediate references that are embedded in the instruction stream.
2052 RelocIterator iter(this, low_boundary);
2053 while (iter.next()) {
2054 if (iter.type() == relocInfo::metadata_type ) {
2055 metadata_Relocation* r = iter.metadata_reloc();
2056 // In this lmetadata, we must only follow those metadatas directly embedded in
2057 // the code. Other metadatas (oop_index>0) are seen as part of
2058 // the metadata section below.
2059 assert(1 == (r->metadata_is_immediate()) +
2060 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
2061 "metadata must be found in exactly one place");
2062 if (r->metadata_is_immediate() && r->metadata_value() != NULL) {
2063 Metadata* md = r->metadata_value();
2064 if (md != _method) f(md);
2065 }
2066 } else if (iter.type() == relocInfo::virtual_call_type) {
2067 // Check compiledIC holders associated with this nmethod
2068 CompiledIC *ic = CompiledIC_at(&iter);
2069 if (ic->is_icholder_call()) {
2070 CompiledICHolder* cichk = ic->cached_icholder();
2071 f(cichk->holder_method());
2072 f(cichk->holder_klass());
2073 } else {
2074 Metadata* ic_oop = ic->cached_metadata();
2075 if (ic_oop != NULL) {
2076 f(ic_oop);
2077 }
2078 }
2079 }
2080 }
2081 }
2082
2083 // Visit the metadata section
2084 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
2085 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops
2086 Metadata* md = *p;
2087 f(md);
2088 }
2089
2090 // Call function Method*, not embedded in these other places.
2091 if (_method != NULL) f(_method);
2092 }
2093
2094 void nmethod::oops_do(OopClosure* f, bool allow_zombie) {
2095 // make sure the oops ready to receive visitors
2096 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod");
2097 assert(!is_unloaded(), "should not call follow on unloaded nmethod");
2098
2099 // If the method is not entrant or zombie then a JMP is plastered over the
2100 // first few bytes. If an oop in the old code was there, that oop
2101 // should not get GC'd. Skip the first few bytes of oops on
2102 // not-entrant methods.
2103 address low_boundary = verified_entry_point();
2104 if (is_not_entrant()) {
2105 low_boundary += NativeJump::instruction_size;
2106 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
2107 // (See comment above.)
2108 }
2109
2110 RelocIterator iter(this, low_boundary);
2111
2112 while (iter.next()) {
2113 if (iter.type() == relocInfo::oop_type ) {
2114 oop_Relocation* r = iter.oop_reloc();
2115 // In this loop, we must only follow those oops directly embedded in
2116 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
2117 assert(1 == (r->oop_is_immediate()) +
2118 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
2119 "oop must be found in exactly one place");
2120 if (r->oop_is_immediate() && r->oop_value() != NULL) {
2121 f->do_oop(r->oop_addr());
2122 }
2123 }
2124 }
2125
2126 // Scopes
2127 // This includes oop constants not inlined in the code stream.
2128 for (oop* p = oops_begin(); p < oops_end(); p++) {
2129 if (*p == Universe::non_oop_word()) continue; // skip non-oops
2130 f->do_oop(p);
2131 }
2132 }
2133
2134 #define NMETHOD_SENTINEL ((nmethod*)badAddress)
2135
2136 nmethod* volatile nmethod::_oops_do_mark_nmethods;
2137
2138 // An nmethod is "marked" if its _mark_link is set non-null.
2139 // Even if it is the end of the linked list, it will have a non-null link value,
2140 // as long as it is on the list.
2141 // This code must be MP safe, because it is used from parallel GC passes.
2142 bool nmethod::test_set_oops_do_mark() {
2143 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");
2144 nmethod* observed_mark_link = _oops_do_mark_link;
2145 if (observed_mark_link == NULL) {
2146 // Claim this nmethod for this thread to mark.
2147 observed_mark_link = (nmethod*)
2148 Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_link, NULL);
2149 if (observed_mark_link == NULL) {
2150
2151 // Atomically append this nmethod (now claimed) to the head of the list:
2152 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods;
2153 for (;;) {
2154 nmethod* required_mark_nmethods = observed_mark_nmethods;
2155 _oops_do_mark_link = required_mark_nmethods;
2156 observed_mark_nmethods = (nmethod*)
2157 Atomic::cmpxchg_ptr(this, &_oops_do_mark_nmethods, required_mark_nmethods);
2158 if (observed_mark_nmethods == required_mark_nmethods)
2159 break;
2160 }
2161 // Mark was clear when we first saw this guy.
2162 NOT_PRODUCT(if (TraceScavenge) print_on(tty, "oops_do, mark"));
2163 return false;
2164 }
2165 }
2166 // On fall through, another racing thread marked this nmethod before we did.
2167 return true;
2168 }
2169
2170 void nmethod::oops_do_marking_prologue() {
2171 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("[oops_do_marking_prologue"));
2172 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row");
2173 // We use cmpxchg_ptr instead of regular assignment here because the user
2174 // may fork a bunch of threads, and we need them all to see the same state.
2175 void* observed = Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, NULL);
2176 guarantee(observed == NULL, "no races in this sequential code");
2177 }
2178
2179 void nmethod::oops_do_marking_epilogue() {
2180 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row");
2181 nmethod* cur = _oops_do_mark_nmethods;
2182 while (cur != NMETHOD_SENTINEL) {
2183 assert(cur != NULL, "not NULL-terminated");
2184 nmethod* next = cur->_oops_do_mark_link;
2185 cur->_oops_do_mark_link = NULL;
2186 cur->verify_oop_relocations();
2187 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark"));
2188 cur = next;
2189 }
2190 void* required = _oops_do_mark_nmethods;
2191 void* observed = Atomic::cmpxchg_ptr(NULL, &_oops_do_mark_nmethods, required);
2192 guarantee(observed == required, "no races in this sequential code");
2193 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("oops_do_marking_epilogue]"));
2194 }
2195
2196 class DetectScavengeRoot: public OopClosure {
2197 bool _detected_scavenge_root;
2198 public:
2199 DetectScavengeRoot() : _detected_scavenge_root(false)
2200 { NOT_PRODUCT(_print_nm = NULL); }
2201 bool detected_scavenge_root() { return _detected_scavenge_root; }
2202 virtual void do_oop(oop* p) {
2203 if ((*p) != NULL && (*p)->is_scavengable()) {
2204 NOT_PRODUCT(maybe_print(p));
2205 _detected_scavenge_root = true;
2206 }
2207 }
2208 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2209
2210 #ifndef PRODUCT
2211 nmethod* _print_nm;
2212 void maybe_print(oop* p) {
2213 if (_print_nm == NULL) return;
2214 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root");
2215 tty->print_cr(""PTR_FORMAT"[offset=%d] detected scavengable oop "PTR_FORMAT" (found at "PTR_FORMAT")",
2216 _print_nm, (int)((intptr_t)p - (intptr_t)_print_nm),
2217 (void *)(*p), (intptr_t)p);
2218 (*p)->print();
2219 }
2220 #endif //PRODUCT
2221 };
2222
2223 bool nmethod::detect_scavenge_root_oops() {
2224 DetectScavengeRoot detect_scavenge_root;
2225 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this);
2226 oops_do(&detect_scavenge_root);
2227 return detect_scavenge_root.detected_scavenge_root();
2228 }
2229
2230 // Method that knows how to preserve outgoing arguments at call. This method must be
2231 // called with a frame corresponding to a Java invoke
2232 void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) {
2233 #ifndef SHARK
2234 if (!method()->is_native()) {
2235 SimpleScopeDesc ssd(this, fr.pc());
2236 Bytecode_invoke call(ssd.method(), ssd.bci());
2237 bool has_receiver = call.has_receiver();
2238 bool has_appendix = call.has_appendix();
2239 Symbol* signature = call.signature();
2240 fr.oops_compiled_arguments_do(signature, has_receiver, has_appendix, reg_map, f);
2241 }
2242 #endif // !SHARK
2243 }
2244
2245
2246 oop nmethod::embeddedOop_at(u_char* p) {
2247 RelocIterator iter(this, p, p + 1);
2248 while (iter.next())
2249 if (iter.type() == relocInfo::oop_type) {
2250 return iter.oop_reloc()->oop_value();
2251 }
2252 return NULL;
2253 }
2254
2255
2256 inline bool includes(void* p, void* from, void* to) {
2257 return from <= p && p < to;
2258 }
2259
2260
2261 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
2262 assert(count >= 2, "must be sentinel values, at least");
2263
2264 #ifdef ASSERT
2265 // must be sorted and unique; we do a binary search in find_pc_desc()
2266 int prev_offset = pcs[0].pc_offset();
2267 assert(prev_offset == PcDesc::lower_offset_limit,
2268 "must start with a sentinel");
2269 for (int i = 1; i < count; i++) {
2270 int this_offset = pcs[i].pc_offset();
2271 assert(this_offset > prev_offset, "offsets must be sorted");
2272 prev_offset = this_offset;
2273 }
2274 assert(prev_offset == PcDesc::upper_offset_limit,
2275 "must end with a sentinel");
2276 #endif //ASSERT
2277
2278 // Search for MethodHandle invokes and tag the nmethod.
2279 for (int i = 0; i < count; i++) {
2280 if (pcs[i].is_method_handle_invoke()) {
2281 set_has_method_handle_invokes(true);
2282 break;
2283 }
2284 }
2285 assert(has_method_handle_invokes() == (_deoptimize_mh_offset != -1), "must have deopt mh handler");
2286
2287 int size = count * sizeof(PcDesc);
2288 assert(scopes_pcs_size() >= size, "oob");
2289 memcpy(scopes_pcs_begin(), pcs, size);
2290
2291 // Adjust the final sentinel downward.
2292 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
2293 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
2294 last_pc->set_pc_offset(content_size() + 1);
2295 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
2296 // Fill any rounding gaps with copies of the last record.
2297 last_pc[1] = last_pc[0];
2298 }
2299 // The following assert could fail if sizeof(PcDesc) is not
2300 // an integral multiple of oopSize (the rounding term).
2301 // If it fails, change the logic to always allocate a multiple
2302 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
2303 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
2304 }
2305
2306 void nmethod::copy_scopes_data(u_char* buffer, int size) {
2307 assert(scopes_data_size() >= size, "oob");
2308 memcpy(scopes_data_begin(), buffer, size);
2309 }
2310
2311
2312 #ifdef ASSERT
2313 static PcDesc* linear_search(nmethod* nm, int pc_offset, bool approximate) {
2314 PcDesc* lower = nm->scopes_pcs_begin();
2315 PcDesc* upper = nm->scopes_pcs_end();
2316 lower += 1; // exclude initial sentinel
2317 PcDesc* res = NULL;
2318 for (PcDesc* p = lower; p < upper; p++) {
2319 NOT_PRODUCT(--nmethod_stats.pc_desc_tests); // don't count this call to match_desc
2320 if (match_desc(p, pc_offset, approximate)) {
2321 if (res == NULL)
2322 res = p;
2323 else
2324 res = (PcDesc*) badAddress;
2325 }
2326 }
2327 return res;
2328 }
2329 #endif
2330
2331
2332 // Finds a PcDesc with real-pc equal to "pc"
2333 PcDesc* nmethod::find_pc_desc_internal(address pc, bool approximate) {
2334 address base_address = code_begin();
2335 if ((pc < base_address) ||
2336 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
2337 return NULL; // PC is wildly out of range
2338 }
2339 int pc_offset = (int) (pc - base_address);
2340
2341 // Check the PcDesc cache if it contains the desired PcDesc
2342 // (This as an almost 100% hit rate.)
2343 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
2344 if (res != NULL) {
2345 assert(res == linear_search(this, pc_offset, approximate), "cache ok");
2346 return res;
2347 }
2348
2349 // Fallback algorithm: quasi-linear search for the PcDesc
2350 // Find the last pc_offset less than the given offset.
2351 // The successor must be the required match, if there is a match at all.
2352 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
2353 PcDesc* lower = scopes_pcs_begin();
2354 PcDesc* upper = scopes_pcs_end();
2355 upper -= 1; // exclude final sentinel
2356 if (lower >= upper) return NULL; // native method; no PcDescs at all
2357
2358 #define assert_LU_OK \
2359 /* invariant on lower..upper during the following search: */ \
2360 assert(lower->pc_offset() < pc_offset, "sanity"); \
2361 assert(upper->pc_offset() >= pc_offset, "sanity")
2362 assert_LU_OK;
2363
2364 // Use the last successful return as a split point.
2365 PcDesc* mid = _pc_desc_cache.last_pc_desc();
2366 NOT_PRODUCT(++nmethod_stats.pc_desc_searches);
2367 if (mid->pc_offset() < pc_offset) {
2368 lower = mid;
2369 } else {
2370 upper = mid;
2371 }
2372
2373 // Take giant steps at first (4096, then 256, then 16, then 1)
2374 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
2375 const int RADIX = (1 << LOG2_RADIX);
2376 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
2377 while ((mid = lower + step) < upper) {
2378 assert_LU_OK;
2379 NOT_PRODUCT(++nmethod_stats.pc_desc_searches);
2380 if (mid->pc_offset() < pc_offset) {
2381 lower = mid;
2382 } else {
2383 upper = mid;
2384 break;
2385 }
2386 }
2387 assert_LU_OK;
2388 }
2389
2390 // Sneak up on the value with a linear search of length ~16.
2391 while (true) {
2392 assert_LU_OK;
2393 mid = lower + 1;
2394 NOT_PRODUCT(++nmethod_stats.pc_desc_searches);
2395 if (mid->pc_offset() < pc_offset) {
2396 lower = mid;
2397 } else {
2398 upper = mid;
2399 break;
2400 }
2401 }
2402 #undef assert_LU_OK
2403
2404 if (match_desc(upper, pc_offset, approximate)) {
2405 assert(upper == linear_search(this, pc_offset, approximate), "search ok");
2406 _pc_desc_cache.add_pc_desc(upper);
2407 return upper;
2408 } else {
2409 assert(NULL == linear_search(this, pc_offset, approximate), "search ok");
2410 return NULL;
2411 }
2412 }
2413
2414
2415 void nmethod::check_all_dependencies(DepChange& changes) {
2416 // Checked dependencies are allocated into this ResourceMark
2417 ResourceMark rm;
2418
2419 // Turn off dependency tracing while actually testing dependencies.
2420 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) );
2421
2422 typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash,
2423 &DependencySignature::equals, 11027> DepTable;
2424
2425 DepTable* table = new DepTable();
2426
2427 // Iterate over live nmethods and check dependencies of all nmethods that are not
2428 // marked for deoptimization. A particular dependency is only checked once.
2429 NMethodIterator iter;
2430 while(iter.next()) {
2431 nmethod* nm = iter.method();
2432 // Only notify for live nmethods
2433 if (nm->is_alive() && !nm->is_marked_for_deoptimization()) {
2434 for (Dependencies::DepStream deps(nm); deps.next(); ) {
2435 // Construct abstraction of a dependency.
2436 DependencySignature* current_sig = new DependencySignature(deps);
2437
2438 // Determine if dependency is already checked. table->put(...) returns
2439 // 'true' if the dependency is added (i.e., was not in the hashtable).
2440 if (table->put(*current_sig, 1)) {
2441 if (deps.check_dependency() != NULL) {
2442 // Dependency checking failed. Print out information about the failed
2443 // dependency and finally fail with an assert. We can fail here, since
2444 // dependency checking is never done in a product build.
2445 changes.print();
2446 nm->print();
2447 nm->print_dependencies();
2448 assert(false, "Should have been marked for deoptimization");
2449 }
2450 }
2451 }
2452 }
2453 }
2454 }
2455
2456 bool nmethod::check_dependency_on(DepChange& changes) {
2457 // What has happened:
2458 // 1) a new class dependee has been added
2459 // 2) dependee and all its super classes have been marked
2460 bool found_check = false; // set true if we are upset
2461 for (Dependencies::DepStream deps(this); deps.next(); ) {
2462 // Evaluate only relevant dependencies.
2463 if (deps.spot_check_dependency_at(changes) != NULL) {
2464 found_check = true;
2465 NOT_DEBUG(break);
2466 }
2467 }
2468 return found_check;
2469 }
2470
2471 bool nmethod::is_evol_dependent_on(Klass* dependee) {
2472 InstanceKlass *dependee_ik = InstanceKlass::cast(dependee);
2473 Array<Method*>* dependee_methods = dependee_ik->methods();
2474 for (Dependencies::DepStream deps(this); deps.next(); ) {
2475 if (deps.type() == Dependencies::evol_method) {
2476 Method* method = deps.method_argument(0);
2477 for (int j = 0; j < dependee_methods->length(); j++) {
2478 if (dependee_methods->at(j) == method) {
2479 // RC_TRACE macro has an embedded ResourceMark
2480 RC_TRACE(0x01000000,
2481 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)",
2482 _method->method_holder()->external_name(),
2483 _method->name()->as_C_string(),
2484 _method->signature()->as_C_string(), compile_id(),
2485 method->method_holder()->external_name(),
2486 method->name()->as_C_string(),
2487 method->signature()->as_C_string()));
2488 if (TraceDependencies || LogCompilation)
2489 deps.log_dependency(dependee);
2490 return true;
2491 }
2492 }
2493 }
2494 }
2495 return false;
2496 }
2497
2498 // Called from mark_for_deoptimization, when dependee is invalidated.
2499 bool nmethod::is_dependent_on_method(Method* dependee) {
2500 for (Dependencies::DepStream deps(this); deps.next(); ) {
2501 if (deps.type() != Dependencies::evol_method)
2502 continue;
2503 Method* method = deps.method_argument(0);
2504 if (method == dependee) return true;
2505 }
2506 return false;
2507 }
2508
2509
2510 bool nmethod::is_patchable_at(address instr_addr) {
2511 assert(insts_contains(instr_addr), "wrong nmethod used");
2512 if (is_zombie()) {
2513 // a zombie may never be patched
2514 return false;
2515 }
2516 return true;
2517 }
2518
2519
2520 address nmethod::continuation_for_implicit_exception(address pc) {
2521 // Exception happened outside inline-cache check code => we are inside
2522 // an active nmethod => use cpc to determine a return address
2523 int exception_offset = pc - code_begin();
2524 int cont_offset = ImplicitExceptionTable(this).at( exception_offset );
2525 #ifdef ASSERT
2526 if (cont_offset == 0) {
2527 Thread* thread = ThreadLocalStorage::get_thread_slow();
2528 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
2529 HandleMark hm(thread);
2530 ResourceMark rm(thread);
2531 CodeBlob* cb = CodeCache::find_blob(pc);
2532 assert(cb != NULL && cb == this, "");
2533 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, pc);
2534 print();
2535 method()->print_codes();
2536 print_code();
2537 print_pcs();
2538 }
2539 #endif
2540 if (cont_offset == 0) {
2541 // Let the normal error handling report the exception
2542 return NULL;
2543 }
2544 return code_begin() + cont_offset;
2545 }
2546
2547
2548
2549 void nmethod_init() {
2550 // make sure you didn't forget to adjust the filler fields
2551 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
2552 }
2553
2554
2555 //-------------------------------------------------------------------------------------------
2556
2557
2558 // QQQ might we make this work from a frame??
2559 nmethodLocker::nmethodLocker(address pc) {
2560 CodeBlob* cb = CodeCache::find_blob(pc);
2561 guarantee(cb != NULL && cb->is_nmethod(), "bad pc for a nmethod found");
2562 _nm = (nmethod*)cb;
2563 lock_nmethod(_nm);
2564 }
2565
2566 // Only JvmtiDeferredEvent::compiled_method_unload_event()
2567 // should pass zombie_ok == true.
2568 void nmethodLocker::lock_nmethod(nmethod* nm, bool zombie_ok) {
2569 if (nm == NULL) return;
2570 Atomic::inc(&nm->_lock_count);
2571 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method");
2572 }
2573
2574 void nmethodLocker::unlock_nmethod(nmethod* nm) {
2575 if (nm == NULL) return;
2576 Atomic::dec(&nm->_lock_count);
2577 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock");
2578 }
2579
2580
2581 // -----------------------------------------------------------------------------
2582 // nmethod::get_deopt_original_pc
2583 //
2584 // Return the original PC for the given PC if:
2585 // (a) the given PC belongs to a nmethod and
2586 // (b) it is a deopt PC
2587 address nmethod::get_deopt_original_pc(const frame* fr) {
2588 if (fr->cb() == NULL) return NULL;
2589
2590 nmethod* nm = fr->cb()->as_nmethod_or_null();
2591 if (nm != NULL && nm->is_deopt_pc(fr->pc()))
2592 return nm->get_original_pc(fr);
2593
2594 return NULL;
2595 }
2596
2597
2598 // -----------------------------------------------------------------------------
2599 // MethodHandle
2600
2601 bool nmethod::is_method_handle_return(address return_pc) {
2602 if (!has_method_handle_invokes()) return false;
2603 PcDesc* pd = pc_desc_at(return_pc);
2604 if (pd == NULL)
2605 return false;
2606 return pd->is_method_handle_invoke();
2607 }
2608
2609
2610 // -----------------------------------------------------------------------------
2611 // Verification
2612
2613 class VerifyOopsClosure: public OopClosure {
2614 nmethod* _nm;
2615 bool _ok;
2616 public:
2617 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
2618 bool ok() { return _ok; }
2619 virtual void do_oop(oop* p) {
2620 if ((*p) == NULL || (*p)->is_oop()) return;
2621 if (_ok) {
2622 _nm->print_nmethod(true);
2623 _ok = false;
2624 }
2625 tty->print_cr("*** non-oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)",
2626 (void *)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm));
2627 }
2628 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2629 };
2630
2631 void nmethod::verify() {
2632
2633 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant
2634 // seems odd.
2635
2636 if( is_zombie() || is_not_entrant() )
2637 return;
2638
2639 // Make sure all the entry points are correctly aligned for patching.
2640 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
2641
2642 // assert(method()->is_oop(), "must be valid");
2643
2644 ResourceMark rm;
2645
2646 if (!CodeCache::contains(this)) {
2647 fatal(err_msg("nmethod at " INTPTR_FORMAT " not in zone", this));
2648 }
2649
2650 if(is_native_method() )
2651 return;
2652
2653 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
2654 if (nm != this) {
2655 fatal(err_msg("findNMethod did not find this nmethod (" INTPTR_FORMAT ")",
2656 this));
2657 }
2658
2659 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2660 if (! p->verify(this)) {
2661 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", this);
2662 }
2663 }
2664
2665 VerifyOopsClosure voc(this);
2666 oops_do(&voc);
2667 assert(voc.ok(), "embedded oops must be OK");
2668 verify_scavenge_root_oops();
2669
2670 verify_scopes();
2671 }
2672
2673
2674 void nmethod::verify_interrupt_point(address call_site) {
2675 // Verify IC only when nmethod installation is finished.
2676 bool is_installed = (method()->code() == this) // nmethod is in state 'in_use' and installed
2677 || !this->is_in_use(); // nmethod is installed, but not in 'in_use' state
2678 if (is_installed) {
2679 Thread *cur = Thread::current();
2680 if (CompiledIC_lock->owner() == cur ||
2681 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) &&
2682 SafepointSynchronize::is_at_safepoint())) {
2683 CompiledIC_at(this, call_site);
2684 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
2685 } else {
2686 MutexLocker ml_verify (CompiledIC_lock);
2687 CompiledIC_at(this, call_site);
2688 }
2689 }
2690
2691 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address());
2692 assert(pd != NULL, "PcDesc must exist");
2693 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(),
2694 pd->obj_decode_offset(), pd->should_reexecute(),
2695 pd->return_oop());
2696 !sd->is_top(); sd = sd->sender()) {
2697 sd->verify();
2698 }
2699 }
2700
2701 void nmethod::verify_scopes() {
2702 if( !method() ) return; // Runtime stubs have no scope
2703 if (method()->is_native()) return; // Ignore stub methods.
2704 // iterate through all interrupt point
2705 // and verify the debug information is valid.
2706 RelocIterator iter((nmethod*)this);
2707 while (iter.next()) {
2708 address stub = NULL;
2709 switch (iter.type()) {
2710 case relocInfo::virtual_call_type:
2711 verify_interrupt_point(iter.addr());
2712 break;
2713 case relocInfo::opt_virtual_call_type:
2714 stub = iter.opt_virtual_call_reloc()->static_stub();
2715 verify_interrupt_point(iter.addr());
2716 break;
2717 case relocInfo::static_call_type:
2718 stub = iter.static_call_reloc()->static_stub();
2719 //verify_interrupt_point(iter.addr());
2720 break;
2721 case relocInfo::runtime_call_type:
2722 address destination = iter.reloc()->value();
2723 // Right now there is no way to find out which entries support
2724 // an interrupt point. It would be nice if we had this
2725 // information in a table.
2726 break;
2727 }
2728 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section");
2729 }
2730 }
2731
2732
2733 // -----------------------------------------------------------------------------
2734 // Non-product code
2735 #ifndef PRODUCT
2736
2737 class DebugScavengeRoot: public OopClosure {
2738 nmethod* _nm;
2739 bool _ok;
2740 public:
2741 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { }
2742 bool ok() { return _ok; }
2743 virtual void do_oop(oop* p) {
2744 if ((*p) == NULL || !(*p)->is_scavengable()) return;
2745 if (_ok) {
2746 _nm->print_nmethod(true);
2747 _ok = false;
2748 }
2749 tty->print_cr("*** scavengable oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)",
2750 (void *)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm));
2751 (*p)->print();
2752 }
2753 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2754 };
2755
2756 void nmethod::verify_scavenge_root_oops() {
2757 if (UseG1GC) {
2758 return;
2759 }
2760
2761 if (!on_scavenge_root_list()) {
2762 // Actually look inside, to verify the claim that it's clean.
2763 DebugScavengeRoot debug_scavenge_root(this);
2764 oops_do(&debug_scavenge_root);
2765 if (!debug_scavenge_root.ok())
2766 fatal("found an unadvertised bad scavengable oop in the code cache");
2767 }
2768 assert(scavenge_root_not_marked(), "");
2769 }
2770
2771 #endif // PRODUCT
2772
2773 // Printing operations
2774
2775 void nmethod::print() const {
2776 ResourceMark rm;
2777 ttyLocker ttyl; // keep the following output all in one block
2778
2779 tty->print("Compiled method ");
2780
2781 if (is_compiled_by_c1()) {
2782 tty->print("(c1) ");
2783 } else if (is_compiled_by_c2()) {
2784 tty->print("(c2) ");
2785 } else if (is_compiled_by_shark()) {
2786 tty->print("(shark) ");
2787 } else {
2788 tty->print("(nm) ");
2789 }
2790
2791 print_on(tty, NULL);
2792
2793 if (WizardMode) {
2794 tty->print("((nmethod*) "INTPTR_FORMAT ") ", this);
2795 tty->print(" for method " INTPTR_FORMAT , (address)method());
2796 tty->print(" { ");
2797 if (is_in_use()) tty->print("in_use ");
2798 if (is_not_entrant()) tty->print("not_entrant ");
2799 if (is_zombie()) tty->print("zombie ");
2800 if (is_unloaded()) tty->print("unloaded ");
2801 if (on_scavenge_root_list()) tty->print("scavenge_root ");
2802 tty->print_cr("}:");
2803 }
2804 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2805 (address)this,
2806 (address)this + size(),
2807 size());
2808 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2809 relocation_begin(),
2810 relocation_end(),
2811 relocation_size());
2812 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2813 consts_begin(),
2814 consts_end(),
2815 consts_size());
2816 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2817 insts_begin(),
2818 insts_end(),
2819 insts_size());
2820 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2821 stub_begin(),
2822 stub_end(),
2823 stub_size());
2824 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2825 oops_begin(),
2826 oops_end(),
2827 oops_size());
2828 if (metadata_size () > 0) tty->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2829 metadata_begin(),
2830 metadata_end(),
2831 metadata_size());
2832 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2833 scopes_data_begin(),
2834 scopes_data_end(),
2835 scopes_data_size());
2836 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2837 scopes_pcs_begin(),
2838 scopes_pcs_end(),
2839 scopes_pcs_size());
2840 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2841 dependencies_begin(),
2842 dependencies_end(),
2843 dependencies_size());
2844 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2845 handler_table_begin(),
2846 handler_table_end(),
2847 handler_table_size());
2848 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2849 nul_chk_table_begin(),
2850 nul_chk_table_end(),
2851 nul_chk_table_size());
2852 }
2853
2854 void nmethod::print_code() {
2855 HandleMark hm;
2856 ResourceMark m;
2857 Disassembler::decode(this);
2858 }
2859
2860
2861 #ifndef PRODUCT
2862
2863 void nmethod::print_scopes() {
2864 // Find the first pc desc for all scopes in the code and print it.
2865 ResourceMark rm;
2866 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2867 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
2868 continue;
2869
2870 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
2871 sd->print_on(tty, p);
2872 }
2873 }
2874
2875 void nmethod::print_dependencies() {
2876 ResourceMark rm;
2877 ttyLocker ttyl; // keep the following output all in one block
2878 tty->print_cr("Dependencies:");
2879 for (Dependencies::DepStream deps(this); deps.next(); ) {
2880 deps.print_dependency();
2881 Klass* ctxk = deps.context_type();
2882 if (ctxk != NULL) {
2883 if (ctxk->oop_is_instance() && ((InstanceKlass*)ctxk)->is_dependent_nmethod(this)) {
2884 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name());
2885 }
2886 }
2887 deps.log_dependency(); // put it into the xml log also
2888 }
2889 }
2890
2891
2892 void nmethod::print_relocations() {
2893 ResourceMark m; // in case methods get printed via the debugger
2894 tty->print_cr("relocations:");
2895 RelocIterator iter(this);
2896 iter.print();
2897 if (UseRelocIndex) {
2898 jint* index_end = (jint*)relocation_end() - 1;
2899 jint index_size = *index_end;
2900 jint* index_start = (jint*)( (address)index_end - index_size );
2901 tty->print_cr(" index @" INTPTR_FORMAT ": index_size=%d", index_start, index_size);
2902 if (index_size > 0) {
2903 jint* ip;
2904 for (ip = index_start; ip+2 <= index_end; ip += 2)
2905 tty->print_cr(" (%d %d) addr=" INTPTR_FORMAT " @" INTPTR_FORMAT,
2906 ip[0],
2907 ip[1],
2908 header_end()+ip[0],
2909 relocation_begin()-1+ip[1]);
2910 for (; ip < index_end; ip++)
2911 tty->print_cr(" (%d ?)", ip[0]);
2912 tty->print_cr(" @" INTPTR_FORMAT ": index_size=%d", ip, *ip);
2913 ip++;
2914 tty->print_cr("reloc_end @" INTPTR_FORMAT ":", ip);
2915 }
2916 }
2917 }
2918
2919
2920 void nmethod::print_pcs() {
2921 ResourceMark m; // in case methods get printed via debugger
2922 tty->print_cr("pc-bytecode offsets:");
2923 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2924 p->print(this);
2925 }
2926 }
2927
2928 #endif // PRODUCT
2929
2930 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
2931 RelocIterator iter(this, begin, end);
2932 bool have_one = false;
2933 while (iter.next()) {
2934 have_one = true;
2935 switch (iter.type()) {
2936 case relocInfo::none: return "no_reloc";
2937 case relocInfo::oop_type: {
2938 stringStream st;
2939 oop_Relocation* r = iter.oop_reloc();
2940 oop obj = r->oop_value();
2941 st.print("oop(");
2942 if (obj == NULL) st.print("NULL");
2943 else obj->print_value_on(&st);
2944 st.print(")");
2945 return st.as_string();
2946 }
2947 case relocInfo::metadata_type: {
2948 stringStream st;
2949 metadata_Relocation* r = iter.metadata_reloc();
2950 Metadata* obj = r->metadata_value();
2951 st.print("metadata(");
2952 if (obj == NULL) st.print("NULL");
2953 else obj->print_value_on(&st);
2954 st.print(")");
2955 return st.as_string();
2956 }
2957 case relocInfo::virtual_call_type: return "virtual_call";
2958 case relocInfo::opt_virtual_call_type: return "optimized virtual_call";
2959 case relocInfo::static_call_type: return "static_call";
2960 case relocInfo::static_stub_type: return "static_stub";
2961 case relocInfo::runtime_call_type: return "runtime_call";
2962 case relocInfo::external_word_type: return "external_word";
2963 case relocInfo::internal_word_type: return "internal_word";
2964 case relocInfo::section_word_type: return "section_word";
2965 case relocInfo::poll_type: return "poll";
2966 case relocInfo::poll_return_type: return "poll_return";
2967 case relocInfo::type_mask: return "type_bit_mask";
2968 }
2969 }
2970 return have_one ? "other" : NULL;
2971 }
2972
2973 // Return a the last scope in (begin..end]
2974 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
2975 PcDesc* p = pc_desc_near(begin+1);
2976 if (p != NULL && p->real_pc(this) <= end) {
2977 return new ScopeDesc(this, p->scope_decode_offset(),
2978 p->obj_decode_offset(), p->should_reexecute(),
2979 p->return_oop());
2980 }
2981 return NULL;
2982 }
2983
2984 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const {
2985 if (block_begin == entry_point()) stream->print_cr("[Entry Point]");
2986 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]");
2987 if (block_begin == exception_begin()) stream->print_cr("[Exception Handler]");
2988 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]");
2989 if (block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]");
2990
2991 if (has_method_handle_invokes())
2992 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]");
2993
2994 if (block_begin == consts_begin()) stream->print_cr("[Constants]");
2995
2996 if (block_begin == entry_point()) {
2997 methodHandle m = method();
2998 if (m.not_null()) {
2999 stream->print(" # ");
3000 m->print_value_on(stream);
3001 stream->cr();
3002 }
3003 if (m.not_null() && !is_osr_method()) {
3004 ResourceMark rm;
3005 int sizeargs = m->size_of_parameters();
3006 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
3007 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
3008 {
3009 int sig_index = 0;
3010 if (!m->is_static())
3011 sig_bt[sig_index++] = T_OBJECT; // 'this'
3012 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) {
3013 BasicType t = ss.type();
3014 sig_bt[sig_index++] = t;
3015 if (type2size[t] == 2) {
3016 sig_bt[sig_index++] = T_VOID;
3017 } else {
3018 assert(type2size[t] == 1, "size is 1 or 2");
3019 }
3020 }
3021 assert(sig_index == sizeargs, "");
3022 }
3023 const char* spname = "sp"; // make arch-specific?
3024 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false);
3025 int stack_slot_offset = this->frame_size() * wordSize;
3026 int tab1 = 14, tab2 = 24;
3027 int sig_index = 0;
3028 int arg_index = (m->is_static() ? 0 : -1);
3029 bool did_old_sp = false;
3030 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) {
3031 bool at_this = (arg_index == -1);
3032 bool at_old_sp = false;
3033 BasicType t = (at_this ? T_OBJECT : ss.type());
3034 assert(t == sig_bt[sig_index], "sigs in sync");
3035 if (at_this)
3036 stream->print(" # this: ");
3037 else
3038 stream->print(" # parm%d: ", arg_index);
3039 stream->move_to(tab1);
3040 VMReg fst = regs[sig_index].first();
3041 VMReg snd = regs[sig_index].second();
3042 if (fst->is_reg()) {
3043 stream->print("%s", fst->name());
3044 if (snd->is_valid()) {
3045 stream->print(":%s", snd->name());
3046 }
3047 } else if (fst->is_stack()) {
3048 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
3049 if (offset == stack_slot_offset) at_old_sp = true;
3050 stream->print("[%s+0x%x]", spname, offset);
3051 } else {
3052 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
3053 }
3054 stream->print(" ");
3055 stream->move_to(tab2);
3056 stream->print("= ");
3057 if (at_this) {
3058 m->method_holder()->print_value_on(stream);
3059 } else {
3060 bool did_name = false;
3061 if (!at_this && ss.is_object()) {
3062 Symbol* name = ss.as_symbol_or_null();
3063 if (name != NULL) {
3064 name->print_value_on(stream);
3065 did_name = true;
3066 }
3067 }
3068 if (!did_name)
3069 stream->print("%s", type2name(t));
3070 }
3071 if (at_old_sp) {
3072 stream->print(" (%s of caller)", spname);
3073 did_old_sp = true;
3074 }
3075 stream->cr();
3076 sig_index += type2size[t];
3077 arg_index += 1;
3078 if (!at_this) ss.next();
3079 }
3080 if (!did_old_sp) {
3081 stream->print(" # ");
3082 stream->move_to(tab1);
3083 stream->print("[%s+0x%x]", spname, stack_slot_offset);
3084 stream->print(" (%s of caller)", spname);
3085 stream->cr();
3086 }
3087 }
3088 }
3089 }
3090
3091 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) {
3092 // First, find an oopmap in (begin, end].
3093 // We use the odd half-closed interval so that oop maps and scope descs
3094 // which are tied to the byte after a call are printed with the call itself.
3095 address base = code_begin();
3096 OopMapSet* oms = oop_maps();
3097 if (oms != NULL) {
3098 for (int i = 0, imax = oms->size(); i < imax; i++) {
3099 OopMap* om = oms->at(i);
3100 address pc = base + om->offset();
3101 if (pc > begin) {
3102 if (pc <= end) {
3103 st->move_to(column);
3104 st->print("; ");
3105 om->print_on(st);
3106 }
3107 break;
3108 }
3109 }
3110 }
3111
3112 // Print any debug info present at this pc.
3113 ScopeDesc* sd = scope_desc_in(begin, end);
3114 if (sd != NULL) {
3115 st->move_to(column);
3116 if (sd->bci() == SynchronizationEntryBCI) {
3117 st->print(";*synchronization entry");
3118 } else {
3119 if (sd->method() == NULL) {
3120 st->print("method is NULL");
3121 } else if (sd->method()->is_native()) {
3122 st->print("method is native");
3123 } else {
3124 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci());
3125 st->print(";*%s", Bytecodes::name(bc));
3126 switch (bc) {
3127 case Bytecodes::_invokevirtual:
3128 case Bytecodes::_invokespecial:
3129 case Bytecodes::_invokestatic:
3130 case Bytecodes::_invokeinterface:
3131 {
3132 Bytecode_invoke invoke(sd->method(), sd->bci());
3133 st->print(" ");
3134 if (invoke.name() != NULL)
3135 invoke.name()->print_symbol_on(st);
3136 else
3137 st->print("<UNKNOWN>");
3138 break;
3139 }
3140 case Bytecodes::_getfield:
3141 case Bytecodes::_putfield:
3142 case Bytecodes::_getstatic:
3143 case Bytecodes::_putstatic:
3144 {
3145 Bytecode_field field(sd->method(), sd->bci());
3146 st->print(" ");
3147 if (field.name() != NULL)
3148 field.name()->print_symbol_on(st);
3149 else
3150 st->print("<UNKNOWN>");
3151 }
3152 }
3153 }
3154 }
3155
3156 // Print all scopes
3157 for (;sd != NULL; sd = sd->sender()) {
3158 st->move_to(column);
3159 st->print("; -");
3160 if (sd->method() == NULL) {
3161 st->print("method is NULL");
3162 } else {
3163 sd->method()->print_short_name(st);
3164 }
3165 int lineno = sd->method()->line_number_from_bci(sd->bci());
3166 if (lineno != -1) {
3167 st->print("@%d (line %d)", sd->bci(), lineno);
3168 } else {
3169 st->print("@%d", sd->bci());
3170 }
3171 st->cr();
3172 }
3173 }
3174
3175 // Print relocation information
3176 const char* str = reloc_string_for(begin, end);
3177 if (str != NULL) {
3178 if (sd != NULL) st->cr();
3179 st->move_to(column);
3180 st->print("; {%s}", str);
3181 }
3182 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin());
3183 if (cont_offset != 0) {
3184 st->move_to(column);
3185 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, code_begin() + cont_offset);
3186 }
3187
3188 }
3189
3190 #ifndef PRODUCT
3191
3192 void nmethod::print_value_on(outputStream* st) const {
3193 st->print("nmethod");
3194 print_on(st, NULL);
3195 }
3196
3197 void nmethod::print_calls(outputStream* st) {
3198 RelocIterator iter(this);
3199 while (iter.next()) {
3200 switch (iter.type()) {
3201 case relocInfo::virtual_call_type:
3202 case relocInfo::opt_virtual_call_type: {
3203 VerifyMutexLocker mc(CompiledIC_lock);
3204 CompiledIC_at(&iter)->print();
3205 break;
3206 }
3207 case relocInfo::static_call_type:
3208 st->print_cr("Static call at " INTPTR_FORMAT, iter.reloc()->addr());
3209 compiledStaticCall_at(iter.reloc())->print();
3210 break;
3211 }
3212 }
3213 }
3214
3215 void nmethod::print_handler_table() {
3216 ExceptionHandlerTable(this).print();
3217 }
3218
3219 void nmethod::print_nul_chk_table() {
3220 ImplicitExceptionTable(this).print(code_begin());
3221 }
3222
3223 void nmethod::print_statistics() {
3224 ttyLocker ttyl;
3225 if (xtty != NULL) xtty->head("statistics type='nmethod'");
3226 nmethod_stats.print_native_nmethod_stats();
3227 nmethod_stats.print_nmethod_stats();
3228 DebugInformationRecorder::print_statistics();
3229 nmethod_stats.print_pc_stats();
3230 Dependencies::print_statistics();
3231 if (xtty != NULL) xtty->tail("statistics");
3232 }
3233
3234 #endif // PRODUCT