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