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