1 /*
2 * Copyright (c) 1997, 2010, 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/nmethod.hpp"
29 #include "code/scopeDesc.hpp"
30 #include "compiler/abstractCompiler.hpp"
31 #include "compiler/compileLog.hpp"
32 #include "compiler/compilerOracle.hpp"
33 #include "compiler/disassembler.hpp"
34 #include "interpreter/bytecode.hpp"
35 #include "oops/methodDataOop.hpp"
36 #include "prims/jvmtiRedefineClassesTrace.hpp"
37 #include "runtime/sharedRuntime.hpp"
38 #include "runtime/sweeper.hpp"
39 #include "utilities/dtrace.hpp"
40 #include "utilities/events.hpp"
41 #include "utilities/xmlstream.hpp"
42 #ifdef SHARK
43 #include "shark/sharkCompiler.hpp"
44 #endif
45
46 #ifdef DTRACE_ENABLED
47
48 // Only bother with this argument setup if dtrace is available
49
50 HS_DTRACE_PROBE_DECL8(hotspot, compiled__method__load,
51 const char*, int, const char*, int, const char*, int, void*, size_t);
52
53 HS_DTRACE_PROBE_DECL6(hotspot, compiled__method__unload,
54 char*, int, char*, int, char*, int);
55
56 #define DTRACE_METHOD_UNLOAD_PROBE(method) \
57 { \
58 methodOop m = (method); \
59 if (m != NULL) { \
60 symbolOop klass_name = m->klass_name(); \
61 symbolOop name = m->name(); \
62 symbolOop signature = m->signature(); \
63 HS_DTRACE_PROBE6(hotspot, compiled__method__unload, \
64 klass_name->bytes(), klass_name->utf8_length(), \
65 name->bytes(), name->utf8_length(), \
66 signature->bytes(), signature->utf8_length()); \
67 } \
68 }
69
70 #else // ndef DTRACE_ENABLED
71
72 #define DTRACE_METHOD_UNLOAD_PROBE(method)
73
74 #endif
75
76 bool nmethod::is_compiled_by_c1() const {
77 if (compiler() == NULL || method() == NULL) return false; // can happen during debug printing
78 if (is_native_method()) return false;
79 return compiler()->is_c1();
80 }
81 bool nmethod::is_compiled_by_c2() const {
82 if (compiler() == NULL || method() == NULL) return false; // can happen during debug printing
83 if (is_native_method()) return false;
84 return compiler()->is_c2();
85 }
86 bool nmethod::is_compiled_by_shark() const {
87 if (is_native_method()) return false;
88 assert(compiler() != NULL, "must be");
89 return compiler()->is_shark();
90 }
91
92
93
94 //---------------------------------------------------------------------------------
95 // NMethod statistics
96 // They are printed under various flags, including:
97 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation.
98 // (In the latter two cases, they like other stats are printed to the log only.)
99
100 #ifndef PRODUCT
101 // These variables are put into one block to reduce relocations
102 // and make it simpler to print from the debugger.
103 static
104 struct nmethod_stats_struct {
105 int nmethod_count;
106 int total_size;
107 int relocation_size;
108 int consts_size;
109 int insts_size;
110 int stub_size;
111 int scopes_data_size;
112 int scopes_pcs_size;
113 int dependencies_size;
114 int handler_table_size;
115 int nul_chk_table_size;
116 int oops_size;
117
118 void note_nmethod(nmethod* nm) {
119 nmethod_count += 1;
120 total_size += nm->size();
121 relocation_size += nm->relocation_size();
122 consts_size += nm->consts_size();
123 insts_size += nm->insts_size();
124 stub_size += nm->stub_size();
125 oops_size += nm->oops_size();
126 scopes_data_size += nm->scopes_data_size();
127 scopes_pcs_size += nm->scopes_pcs_size();
128 dependencies_size += nm->dependencies_size();
129 handler_table_size += nm->handler_table_size();
130 nul_chk_table_size += nm->nul_chk_table_size();
131 }
132 void print_nmethod_stats() {
133 if (nmethod_count == 0) return;
134 tty->print_cr("Statistics for %d bytecoded nmethods:", nmethod_count);
135 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size);
136 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size);
137 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size);
138 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size);
139 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size);
140 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size);
141 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size);
142 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size);
143 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size);
144 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size);
145 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size);
146 }
147
148 int native_nmethod_count;
149 int native_total_size;
150 int native_relocation_size;
151 int native_insts_size;
152 int native_oops_size;
153 void note_native_nmethod(nmethod* nm) {
154 native_nmethod_count += 1;
155 native_total_size += nm->size();
156 native_relocation_size += nm->relocation_size();
157 native_insts_size += nm->insts_size();
158 native_oops_size += nm->oops_size();
159 }
160 void print_native_nmethod_stats() {
161 if (native_nmethod_count == 0) return;
162 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count);
163 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size);
164 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size);
165 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size);
166 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size);
167 }
168
169 int pc_desc_resets; // number of resets (= number of caches)
170 int pc_desc_queries; // queries to nmethod::find_pc_desc
171 int pc_desc_approx; // number of those which have approximate true
172 int pc_desc_repeats; // number of _last_pc_desc hits
173 int pc_desc_hits; // number of LRU cache hits
174 int pc_desc_tests; // total number of PcDesc examinations
175 int pc_desc_searches; // total number of quasi-binary search steps
176 int pc_desc_adds; // number of LUR cache insertions
177
178 void print_pc_stats() {
179 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query",
180 pc_desc_queries,
181 (double)(pc_desc_tests + pc_desc_searches)
182 / pc_desc_queries);
183 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d",
184 pc_desc_resets,
185 pc_desc_queries, pc_desc_approx,
186 pc_desc_repeats, pc_desc_hits,
187 pc_desc_tests, pc_desc_searches, pc_desc_adds);
188 }
189 } nmethod_stats;
190 #endif //PRODUCT
191
192 //---------------------------------------------------------------------------------
193
194
195 // The _unwind_handler is a special marker address, which says that
196 // for given exception oop and address, the frame should be removed
197 // as the tuple cannot be caught in the nmethod
198 address ExceptionCache::_unwind_handler = (address) -1;
199
200
201 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) {
202 assert(pc != NULL, "Must be non null");
203 assert(exception.not_null(), "Must be non null");
204 assert(handler != NULL, "Must be non null");
205
206 _count = 0;
207 _exception_type = exception->klass();
208 _next = NULL;
209
210 add_address_and_handler(pc,handler);
211 }
212
213
214 address ExceptionCache::match(Handle exception, address pc) {
215 assert(pc != NULL,"Must be non null");
216 assert(exception.not_null(),"Must be non null");
217 if (exception->klass() == exception_type()) {
218 return (test_address(pc));
219 }
220
221 return NULL;
222 }
223
224
225 bool ExceptionCache::match_exception_with_space(Handle exception) {
226 assert(exception.not_null(),"Must be non null");
227 if (exception->klass() == exception_type() && count() < cache_size) {
228 return true;
229 }
230 return false;
231 }
232
233
234 address ExceptionCache::test_address(address addr) {
235 for (int i=0; i<count(); i++) {
236 if (pc_at(i) == addr) {
237 return handler_at(i);
238 }
239 }
240 return NULL;
241 }
242
243
244 bool ExceptionCache::add_address_and_handler(address addr, address handler) {
245 if (test_address(addr) == handler) return true;
246 if (count() < cache_size) {
247 set_pc_at(count(),addr);
248 set_handler_at(count(), handler);
249 increment_count();
250 return true;
251 }
252 return false;
253 }
254
255
256 // private method for handling exception cache
257 // These methods are private, and used to manipulate the exception cache
258 // directly.
259 ExceptionCache* nmethod::exception_cache_entry_for_exception(Handle exception) {
260 ExceptionCache* ec = exception_cache();
261 while (ec != NULL) {
262 if (ec->match_exception_with_space(exception)) {
263 return ec;
264 }
265 ec = ec->next();
266 }
267 return NULL;
268 }
269
270
271 //-----------------------------------------------------------------------------
272
273
274 // Helper used by both find_pc_desc methods.
275 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) {
276 NOT_PRODUCT(++nmethod_stats.pc_desc_tests);
277 if (!approximate)
278 return pc->pc_offset() == pc_offset;
279 else
280 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset();
281 }
282
283 void PcDescCache::reset_to(PcDesc* initial_pc_desc) {
284 if (initial_pc_desc == NULL) {
285 _last_pc_desc = NULL; // native method
286 return;
287 }
288 NOT_PRODUCT(++nmethod_stats.pc_desc_resets);
289 // reset the cache by filling it with benign (non-null) values
290 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel");
291 _last_pc_desc = initial_pc_desc + 1; // first valid one is after sentinel
292 for (int i = 0; i < cache_size; i++)
293 _pc_descs[i] = initial_pc_desc;
294 }
295
296 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) {
297 NOT_PRODUCT(++nmethod_stats.pc_desc_queries);
298 NOT_PRODUCT(if (approximate) ++nmethod_stats.pc_desc_approx);
299
300 // In order to prevent race conditions do not load cache elements
301 // repeatedly, but use a local copy:
302 PcDesc* res;
303
304 // Step one: Check the most recently returned value.
305 res = _last_pc_desc;
306 if (res == NULL) return NULL; // native method; no PcDescs at all
307 if (match_desc(res, pc_offset, approximate)) {
308 NOT_PRODUCT(++nmethod_stats.pc_desc_repeats);
309 return res;
310 }
311
312 // Step two: Check the LRU cache.
313 for (int i = 0; i < cache_size; i++) {
314 res = _pc_descs[i];
315 if (res->pc_offset() < 0) break; // optimization: skip empty cache
316 if (match_desc(res, pc_offset, approximate)) {
317 NOT_PRODUCT(++nmethod_stats.pc_desc_hits);
318 _last_pc_desc = res; // record this cache hit in case of repeat
319 return res;
320 }
321 }
322
323 // Report failure.
324 return NULL;
325 }
326
327 void PcDescCache::add_pc_desc(PcDesc* pc_desc) {
328 NOT_PRODUCT(++nmethod_stats.pc_desc_adds);
329 // Update the LRU cache by shifting pc_desc forward:
330 for (int i = 0; i < cache_size; i++) {
331 PcDesc* next = _pc_descs[i];
332 _pc_descs[i] = pc_desc;
333 pc_desc = next;
334 }
335 // Note: Do not update _last_pc_desc. It fronts for the LRU cache.
336 }
337
338 // adjust pcs_size so that it is a multiple of both oopSize and
339 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple
340 // of oopSize, then 2*sizeof(PcDesc) is)
341 static int adjust_pcs_size(int pcs_size) {
342 int nsize = round_to(pcs_size, oopSize);
343 if ((nsize % sizeof(PcDesc)) != 0) {
344 nsize = pcs_size + sizeof(PcDesc);
345 }
346 assert((nsize % oopSize) == 0, "correct alignment");
347 return nsize;
348 }
349
350 //-----------------------------------------------------------------------------
351
352
353 void nmethod::add_exception_cache_entry(ExceptionCache* new_entry) {
354 assert(ExceptionCache_lock->owned_by_self(),"Must hold the ExceptionCache_lock");
355 assert(new_entry != NULL,"Must be non null");
356 assert(new_entry->next() == NULL, "Must be null");
357
358 if (exception_cache() != NULL) {
359 new_entry->set_next(exception_cache());
360 }
361 set_exception_cache(new_entry);
362 }
363
364 void nmethod::remove_from_exception_cache(ExceptionCache* ec) {
365 ExceptionCache* prev = NULL;
366 ExceptionCache* curr = exception_cache();
367 assert(curr != NULL, "nothing to remove");
368 // find the previous and next entry of ec
369 while (curr != ec) {
370 prev = curr;
371 curr = curr->next();
372 assert(curr != NULL, "ExceptionCache not found");
373 }
374 // now: curr == ec
375 ExceptionCache* next = curr->next();
376 if (prev == NULL) {
377 set_exception_cache(next);
378 } else {
379 prev->set_next(next);
380 }
381 delete curr;
382 }
383
384
385 // public method for accessing the exception cache
386 // These are the public access methods.
387 address nmethod::handler_for_exception_and_pc(Handle exception, address pc) {
388 // We never grab a lock to read the exception cache, so we may
389 // have false negatives. This is okay, as it can only happen during
390 // the first few exception lookups for a given nmethod.
391 ExceptionCache* ec = exception_cache();
392 while (ec != NULL) {
393 address ret_val;
394 if ((ret_val = ec->match(exception,pc)) != NULL) {
395 return ret_val;
396 }
397 ec = ec->next();
398 }
399 return NULL;
400 }
401
402
403 void nmethod::add_handler_for_exception_and_pc(Handle exception, address pc, address handler) {
404 // There are potential race conditions during exception cache updates, so we
405 // must own the ExceptionCache_lock before doing ANY modifications. Because
406 // we don't lock during reads, it is possible to have several threads attempt
407 // to update the cache with the same data. We need to check for already inserted
408 // copies of the current data before adding it.
409
410 MutexLocker ml(ExceptionCache_lock);
411 ExceptionCache* target_entry = exception_cache_entry_for_exception(exception);
412
413 if (target_entry == NULL || !target_entry->add_address_and_handler(pc,handler)) {
414 target_entry = new ExceptionCache(exception,pc,handler);
415 add_exception_cache_entry(target_entry);
416 }
417 }
418
419
420 //-------------end of code for ExceptionCache--------------
421
422
423 int nmethod::total_size() const {
424 return
425 consts_size() +
426 insts_size() +
427 stub_size() +
428 scopes_data_size() +
429 scopes_pcs_size() +
430 handler_table_size() +
431 nul_chk_table_size();
432 }
433
434 const char* nmethod::compile_kind() const {
435 if (is_osr_method()) return "osr";
436 if (method() != NULL && is_native_method()) return "c2n";
437 return NULL;
438 }
439
440 // Fill in default values for various flag fields
441 void nmethod::init_defaults() {
442 _state = alive;
443 _marked_for_reclamation = 0;
444 _has_flushed_dependencies = 0;
445 _speculatively_disconnected = 0;
446 _has_unsafe_access = 0;
447 _has_method_handle_invokes = 0;
448 _marked_for_deoptimization = 0;
449 _lock_count = 0;
450 _stack_traversal_mark = 0;
451 _unload_reported = false; // jvmti state
452
453 NOT_PRODUCT(_has_debug_info = false);
454 #ifdef ASSERT
455 _oops_are_stale = false;
456 #endif
457
458 _oops_do_mark_link = NULL;
459 _jmethod_id = NULL;
460 _osr_link = NULL;
461 _scavenge_root_link = NULL;
462 _scavenge_root_state = 0;
463 _saved_nmethod_link = NULL;
464 _compiler = NULL;
465
466 #ifdef HAVE_DTRACE_H
467 _trap_offset = 0;
468 #endif // def HAVE_DTRACE_H
469 }
470
471
472 nmethod* nmethod::new_native_nmethod(methodHandle method,
473 CodeBuffer *code_buffer,
474 int vep_offset,
475 int frame_complete,
476 int frame_size,
477 ByteSize basic_lock_owner_sp_offset,
478 ByteSize basic_lock_sp_offset,
479 OopMapSet* oop_maps) {
480 // create nmethod
481 nmethod* nm = NULL;
482 {
483 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
484 int native_nmethod_size = allocation_size(code_buffer, sizeof(nmethod));
485 CodeOffsets offsets;
486 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
487 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
488 nm = new (native_nmethod_size)
489 nmethod(method(), native_nmethod_size, &offsets,
490 code_buffer, frame_size,
491 basic_lock_owner_sp_offset, basic_lock_sp_offset,
492 oop_maps);
493 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_native_nmethod(nm));
494 if (PrintAssembly && nm != NULL)
495 Disassembler::decode(nm);
496 }
497 // verify nmethod
498 debug_only(if (nm) nm->verify();) // might block
499
500 if (nm != NULL) {
501 nm->log_new_nmethod();
502 }
503
504 return nm;
505 }
506
507 #ifdef HAVE_DTRACE_H
508 nmethod* nmethod::new_dtrace_nmethod(methodHandle method,
509 CodeBuffer *code_buffer,
510 int vep_offset,
511 int trap_offset,
512 int frame_complete,
513 int frame_size) {
514 // create nmethod
515 nmethod* nm = NULL;
516 {
517 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
518 int nmethod_size = allocation_size(code_buffer, sizeof(nmethod));
519 CodeOffsets offsets;
520 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
521 offsets.set_value(CodeOffsets::Dtrace_trap, trap_offset);
522 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
523
524 nm = new (nmethod_size) nmethod(method(), nmethod_size, &offsets, code_buffer, frame_size);
525
526 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_nmethod(nm));
527 if (PrintAssembly && nm != NULL)
528 Disassembler::decode(nm);
529 }
530 // verify nmethod
531 debug_only(if (nm) nm->verify();) // might block
532
533 if (nm != NULL) {
534 nm->log_new_nmethod();
535 }
536
537 return nm;
538 }
539
540 #endif // def HAVE_DTRACE_H
541
542 nmethod* nmethod::new_nmethod(methodHandle method,
543 int compile_id,
544 int entry_bci,
545 CodeOffsets* offsets,
546 int orig_pc_offset,
547 DebugInformationRecorder* debug_info,
548 Dependencies* dependencies,
549 CodeBuffer* code_buffer, int frame_size,
550 OopMapSet* oop_maps,
551 ExceptionHandlerTable* handler_table,
552 ImplicitExceptionTable* nul_chk_table,
553 AbstractCompiler* compiler,
554 int comp_level
555 )
556 {
557 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
558 // create nmethod
559 nmethod* nm = NULL;
560 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
561 int nmethod_size =
562 allocation_size(code_buffer, sizeof(nmethod))
563 + adjust_pcs_size(debug_info->pcs_size())
564 + round_to(dependencies->size_in_bytes() , oopSize)
565 + round_to(handler_table->size_in_bytes(), oopSize)
566 + round_to(nul_chk_table->size_in_bytes(), oopSize)
567 + round_to(debug_info->data_size() , oopSize);
568 nm = new (nmethod_size)
569 nmethod(method(), nmethod_size, compile_id, entry_bci, offsets,
570 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size,
571 oop_maps,
572 handler_table,
573 nul_chk_table,
574 compiler,
575 comp_level);
576 if (nm != NULL) {
577 // To make dependency checking during class loading fast, record
578 // the nmethod dependencies in the classes it is dependent on.
579 // This allows the dependency checking code to simply walk the
580 // class hierarchy above the loaded class, checking only nmethods
581 // which are dependent on those classes. The slow way is to
582 // check every nmethod for dependencies which makes it linear in
583 // the number of methods compiled. For applications with a lot
584 // classes the slow way is too slow.
585 for (Dependencies::DepStream deps(nm); deps.next(); ) {
586 klassOop klass = deps.context_type();
587 if (klass == NULL) continue; // ignore things like evol_method
588
589 // record this nmethod as dependent on this klass
590 instanceKlass::cast(klass)->add_dependent_nmethod(nm);
591 }
592 }
593 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_nmethod(nm));
594 if (PrintAssembly && nm != NULL)
595 Disassembler::decode(nm);
596 }
597
598 // verify nmethod
599 debug_only(if (nm) nm->verify();) // might block
600
601 if (nm != NULL) {
602 nm->log_new_nmethod();
603 }
604
605 // done
606 return nm;
607 }
608
609
610 // For native wrappers
611 nmethod::nmethod(
612 methodOop method,
613 int nmethod_size,
614 CodeOffsets* offsets,
615 CodeBuffer* code_buffer,
616 int frame_size,
617 ByteSize basic_lock_owner_sp_offset,
618 ByteSize basic_lock_sp_offset,
619 OopMapSet* oop_maps )
620 : CodeBlob("native nmethod", code_buffer, sizeof(nmethod),
621 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps),
622 _compiled_synchronized_native_basic_lock_owner_sp_offset(basic_lock_owner_sp_offset),
623 _compiled_synchronized_native_basic_lock_sp_offset(basic_lock_sp_offset)
624 {
625 {
626 debug_only(No_Safepoint_Verifier nsv;)
627 assert_locked_or_safepoint(CodeCache_lock);
628
629 init_defaults();
630 _method = method;
631 _entry_bci = InvocationEntryBci;
632 // We have no exception handler or deopt handler make the
633 // values something that will never match a pc like the nmethod vtable entry
634 _exception_offset = 0;
635 _deoptimize_offset = 0;
636 _deoptimize_mh_offset = 0;
637 _orig_pc_offset = 0;
638
639 _consts_offset = data_offset();
640 _stub_offset = data_offset();
641 _oops_offset = data_offset();
642 _scopes_data_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize);
643 _scopes_pcs_offset = _scopes_data_offset;
644 _dependencies_offset = _scopes_pcs_offset;
645 _handler_table_offset = _dependencies_offset;
646 _nul_chk_table_offset = _handler_table_offset;
647 _nmethod_end_offset = _nul_chk_table_offset;
648 _compile_id = 0; // default
649 _comp_level = CompLevel_none;
650 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
651 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
652 _osr_entry_point = NULL;
653 _exception_cache = NULL;
654 _pc_desc_cache.reset_to(NULL);
655
656 code_buffer->copy_oops_to(this);
657 debug_only(verify_scavenge_root_oops());
658 CodeCache::commit(this);
659 }
660
661 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
662 ttyLocker ttyl; // keep the following output all in one block
663 // This output goes directly to the tty, not the compiler log.
664 // To enable tools to match it up with the compilation activity,
665 // be sure to tag this tty output with the compile ID.
666 if (xtty != NULL) {
667 xtty->begin_head("print_native_nmethod");
668 xtty->method(_method);
669 xtty->stamp();
670 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
671 }
672 // print the header part first
673 print();
674 // then print the requested information
675 if (PrintNativeNMethods) {
676 print_code();
677 oop_maps->print();
678 }
679 if (PrintRelocations) {
680 print_relocations();
681 }
682 if (xtty != NULL) {
683 xtty->tail("print_native_nmethod");
684 }
685 }
686 Events::log("Create nmethod " INTPTR_FORMAT, this);
687 }
688
689 // For dtrace wrappers
690 #ifdef HAVE_DTRACE_H
691 nmethod::nmethod(
692 methodOop method,
693 int nmethod_size,
694 CodeOffsets* offsets,
695 CodeBuffer* code_buffer,
696 int frame_size)
697 : CodeBlob("dtrace nmethod", code_buffer, sizeof(nmethod),
698 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, NULL),
699 _compiled_synchronized_native_basic_lock_owner_sp_offset(in_ByteSize(-1)),
700 _compiled_synchronized_native_basic_lock_sp_offset(in_ByteSize(-1))
701 {
702 {
703 debug_only(No_Safepoint_Verifier nsv;)
704 assert_locked_or_safepoint(CodeCache_lock);
705
706 init_defaults();
707 _method = method;
708 _entry_bci = InvocationEntryBci;
709 // We have no exception handler or deopt handler make the
710 // values something that will never match a pc like the nmethod vtable entry
711 _exception_offset = 0;
712 _deoptimize_offset = 0;
713 _deoptimize_mh_offset = 0;
714 _unwind_handler_offset = -1;
715 _trap_offset = offsets->value(CodeOffsets::Dtrace_trap);
716 _orig_pc_offset = 0;
717 _consts_offset = data_offset();
718 _stub_offset = data_offset();
719 _oops_offset = data_offset();
720 _scopes_data_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize);
721 _scopes_pcs_offset = _scopes_data_offset;
722 _dependencies_offset = _scopes_pcs_offset;
723 _handler_table_offset = _dependencies_offset;
724 _nul_chk_table_offset = _handler_table_offset;
725 _nmethod_end_offset = _nul_chk_table_offset;
726 _compile_id = 0; // default
727 _comp_level = CompLevel_none;
728 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
729 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
730 _osr_entry_point = NULL;
731 _exception_cache = NULL;
732 _pc_desc_cache.reset_to(NULL);
733
734 code_buffer->copy_oops_to(this);
735 debug_only(verify_scavenge_root_oops());
736 CodeCache::commit(this);
737 }
738
739 if (PrintNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
740 ttyLocker ttyl; // keep the following output all in one block
741 // This output goes directly to the tty, not the compiler log.
742 // To enable tools to match it up with the compilation activity,
743 // be sure to tag this tty output with the compile ID.
744 if (xtty != NULL) {
745 xtty->begin_head("print_dtrace_nmethod");
746 xtty->method(_method);
747 xtty->stamp();
748 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
749 }
750 // print the header part first
751 print();
752 // then print the requested information
753 if (PrintNMethods) {
754 print_code();
755 }
756 if (PrintRelocations) {
757 print_relocations();
758 }
759 if (xtty != NULL) {
760 xtty->tail("print_dtrace_nmethod");
761 }
762 }
763 Events::log("Create nmethod " INTPTR_FORMAT, this);
764 }
765 #endif // def HAVE_DTRACE_H
766
767 void* nmethod::operator new(size_t size, int nmethod_size) {
768 // Always leave some room in the CodeCache for I2C/C2I adapters
769 if (CodeCache::unallocated_capacity() < CodeCacheMinimumFreeSpace) return NULL;
770 return CodeCache::allocate(nmethod_size);
771 }
772
773
774 nmethod::nmethod(
775 methodOop method,
776 int nmethod_size,
777 int compile_id,
778 int entry_bci,
779 CodeOffsets* offsets,
780 int orig_pc_offset,
781 DebugInformationRecorder* debug_info,
782 Dependencies* dependencies,
783 CodeBuffer *code_buffer,
784 int frame_size,
785 OopMapSet* oop_maps,
786 ExceptionHandlerTable* handler_table,
787 ImplicitExceptionTable* nul_chk_table,
788 AbstractCompiler* compiler,
789 int comp_level
790 )
791 : CodeBlob("nmethod", code_buffer, sizeof(nmethod),
792 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps),
793 _compiled_synchronized_native_basic_lock_owner_sp_offset(in_ByteSize(-1)),
794 _compiled_synchronized_native_basic_lock_sp_offset(in_ByteSize(-1))
795 {
796 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
797 {
798 debug_only(No_Safepoint_Verifier nsv;)
799 assert_locked_or_safepoint(CodeCache_lock);
800
801 init_defaults();
802 _method = method;
803 _entry_bci = entry_bci;
804 _compile_id = compile_id;
805 _comp_level = comp_level;
806 _compiler = compiler;
807 _orig_pc_offset = orig_pc_offset;
808
809 // Section offsets
810 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts());
811 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs());
812
813 // Exception handler and deopt handler are in the stub section
814 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
815 _deoptimize_offset = _stub_offset + offsets->value(CodeOffsets::Deopt);
816 if (has_method_handle_invokes()) {
817 _deoptimize_mh_offset = _stub_offset + offsets->value(CodeOffsets::DeoptMH);
818 } else {
819 _deoptimize_mh_offset = -1;
820 }
821 if (offsets->value(CodeOffsets::UnwindHandler) != -1) {
822 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler);
823 } else {
824 _unwind_handler_offset = -1;
825 }
826
827 _oops_offset = data_offset();
828 _scopes_data_offset = _oops_offset + round_to(code_buffer->total_oop_size (), oopSize);
829 _scopes_pcs_offset = _scopes_data_offset + round_to(debug_info->data_size (), oopSize);
830 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
831 _handler_table_offset = _dependencies_offset + round_to(dependencies->size_in_bytes (), oopSize);
832 _nul_chk_table_offset = _handler_table_offset + round_to(handler_table->size_in_bytes(), oopSize);
833 _nmethod_end_offset = _nul_chk_table_offset + round_to(nul_chk_table->size_in_bytes(), oopSize);
834
835 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
836 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
837 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry);
838 _exception_cache = NULL;
839 _pc_desc_cache.reset_to(scopes_pcs_begin());
840
841 // Copy contents of ScopeDescRecorder to nmethod
842 code_buffer->copy_oops_to(this);
843 debug_info->copy_to(this);
844 dependencies->copy_to(this);
845 if (ScavengeRootsInCode && detect_scavenge_root_oops()) {
846 CodeCache::add_scavenge_root_nmethod(this);
847 }
848 debug_only(verify_scavenge_root_oops());
849
850 CodeCache::commit(this);
851
852 // Copy contents of ExceptionHandlerTable to nmethod
853 handler_table->copy_to(this);
854 nul_chk_table->copy_to(this);
855
856 // we use the information of entry points to find out if a method is
857 // static or non static
858 assert(compiler->is_c2() ||
859 _method->is_static() == (entry_point() == _verified_entry_point),
860 " entry points must be same for static methods and vice versa");
861 }
862
863 bool printnmethods = PrintNMethods
864 || CompilerOracle::should_print(_method)
865 || CompilerOracle::has_option_string(_method, "PrintNMethods");
866 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
867 print_nmethod(printnmethods);
868 }
869
870 // Note: Do not verify in here as the CodeCache_lock is
871 // taken which would conflict with the CompiledIC_lock
872 // which taken during the verification of call sites.
873 // (was bug - gri 10/25/99)
874
875 Events::log("Create nmethod " INTPTR_FORMAT, this);
876 }
877
878
879 // Print a short set of xml attributes to identify this nmethod. The
880 // output should be embedded in some other element.
881 void nmethod::log_identity(xmlStream* log) const {
882 log->print(" compile_id='%d'", compile_id());
883 const char* nm_kind = compile_kind();
884 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind);
885 if (compiler() != NULL) {
886 log->print(" compiler='%s'", compiler()->name());
887 }
888 if (TieredCompilation) {
889 log->print(" level='%d'", comp_level());
890 }
891 }
892
893
894 #define LOG_OFFSET(log, name) \
895 if ((intptr_t)name##_end() - (intptr_t)name##_begin()) \
896 log->print(" " XSTR(name) "_offset='%d'" , \
897 (intptr_t)name##_begin() - (intptr_t)this)
898
899
900 void nmethod::log_new_nmethod() const {
901 if (LogCompilation && xtty != NULL) {
902 ttyLocker ttyl;
903 HandleMark hm;
904 xtty->begin_elem("nmethod");
905 log_identity(xtty);
906 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", code_begin(), size());
907 xtty->print(" address='" INTPTR_FORMAT "'", (intptr_t) this);
908
909 LOG_OFFSET(xtty, relocation);
910 LOG_OFFSET(xtty, consts);
911 LOG_OFFSET(xtty, insts);
912 LOG_OFFSET(xtty, stub);
913 LOG_OFFSET(xtty, scopes_data);
914 LOG_OFFSET(xtty, scopes_pcs);
915 LOG_OFFSET(xtty, dependencies);
916 LOG_OFFSET(xtty, handler_table);
917 LOG_OFFSET(xtty, nul_chk_table);
918 LOG_OFFSET(xtty, oops);
919
920 xtty->method(method());
921 xtty->stamp();
922 xtty->end_elem();
923 }
924 }
925
926 #undef LOG_OFFSET
927
928
929 void nmethod::print_compilation(outputStream *st, const char *method_name, const char *title,
930 methodOop method, bool is_blocking, int compile_id, int bci, int comp_level) {
931 bool is_synchronized = false, has_xhandler = false, is_native = false;
932 int code_size = -1;
933 if (method != NULL) {
934 is_synchronized = method->is_synchronized();
935 has_xhandler = method->has_exception_handler();
936 is_native = method->is_native();
937 code_size = method->code_size();
938 }
939 // print compilation number
940 st->print("%7d %3d", (int)tty->time_stamp().milliseconds(), compile_id);
941
942 // print method attributes
943 const bool is_osr = bci != InvocationEntryBci;
944 const char blocking_char = is_blocking ? 'b' : ' ';
945 const char compile_type = is_osr ? '%' : ' ';
946 const char sync_char = is_synchronized ? 's' : ' ';
947 const char exception_char = has_xhandler ? '!' : ' ';
948 const char native_char = is_native ? 'n' : ' ';
949 st->print("%c%c%c%c%c ", compile_type, sync_char, exception_char, blocking_char, native_char);
950 if (TieredCompilation) {
951 st->print("%d ", comp_level);
952 }
953
954 // print optional title
955 bool do_nl = false;
956 if (title != NULL) {
957 int tlen = (int) strlen(title);
958 bool do_nl = false;
959 if (tlen > 0 && title[tlen-1] == '\n') { tlen--; do_nl = true; }
960 st->print("%.*s", tlen, title);
961 } else {
962 do_nl = true;
963 }
964
965 // print method name string if given
966 if (method_name != NULL) {
967 st->print(method_name);
968 } else {
969 // otherwise as the method to print itself
970 if (method != NULL && !Universe::heap()->is_gc_active()) {
971 method->print_short_name(st);
972 } else {
973 st->print("(method)");
974 }
975 }
976
977 if (method != NULL) {
978 // print osr_bci if any
979 if (is_osr) st->print(" @ %d", bci);
980 // print method size
981 st->print(" (%d bytes)", code_size);
982 }
983 if (do_nl) st->cr();
984 }
985
986 // Print out more verbose output usually for a newly created nmethod.
987 void nmethod::print_on(outputStream* st, const char* title) const {
988 if (st != NULL) {
989 ttyLocker ttyl;
990 print_compilation(st, /*method_name*/NULL, title,
991 method(), /*is_blocking*/false,
992 compile_id(),
993 is_osr_method() ? osr_entry_bci() : InvocationEntryBci,
994 comp_level());
995 if (WizardMode) st->print(" (" INTPTR_FORMAT ")", this);
996 }
997 }
998
999
1000 void nmethod::print_nmethod(bool printmethod) {
1001 ttyLocker ttyl; // keep the following output all in one block
1002 if (xtty != NULL) {
1003 xtty->begin_head("print_nmethod");
1004 xtty->stamp();
1005 xtty->end_head();
1006 }
1007 // print the header part first
1008 print();
1009 // then print the requested information
1010 if (printmethod) {
1011 print_code();
1012 print_pcs();
1013 oop_maps()->print();
1014 }
1015 if (PrintDebugInfo) {
1016 print_scopes();
1017 }
1018 if (PrintRelocations) {
1019 print_relocations();
1020 }
1021 if (PrintDependencies) {
1022 print_dependencies();
1023 }
1024 if (PrintExceptionHandlers) {
1025 print_handler_table();
1026 print_nul_chk_table();
1027 }
1028 if (xtty != NULL) {
1029 xtty->tail("print_nmethod");
1030 }
1031 }
1032
1033
1034 // Promote one word from an assembly-time handle to a live embedded oop.
1035 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
1036 if (handle == NULL ||
1037 // As a special case, IC oops are initialized to 1 or -1.
1038 handle == (jobject) Universe::non_oop_word()) {
1039 (*dest) = (oop) handle;
1040 } else {
1041 (*dest) = JNIHandles::resolve_non_null(handle);
1042 }
1043 }
1044
1045
1046 void nmethod::copy_oops(GrowableArray<jobject>* array) {
1047 //assert(oops_size() == 0, "do this handshake just once, please");
1048 int length = array->length();
1049 assert((address)(oops_begin() + length) <= data_end(), "oops big enough");
1050 oop* dest = oops_begin();
1051 for (int index = 0 ; index < length; index++) {
1052 initialize_immediate_oop(&dest[index], array->at(index));
1053 }
1054
1055 // Now we can fix up all the oops in the code. We need to do this
1056 // in the code because the assembler uses jobjects as placeholders.
1057 // The code and relocations have already been initialized by the
1058 // CodeBlob constructor, so it is valid even at this early point to
1059 // iterate over relocations and patch the code.
1060 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true);
1061 }
1062
1063
1064 bool nmethod::is_at_poll_return(address pc) {
1065 RelocIterator iter(this, pc, pc+1);
1066 while (iter.next()) {
1067 if (iter.type() == relocInfo::poll_return_type)
1068 return true;
1069 }
1070 return false;
1071 }
1072
1073
1074 bool nmethod::is_at_poll_or_poll_return(address pc) {
1075 RelocIterator iter(this, pc, pc+1);
1076 while (iter.next()) {
1077 relocInfo::relocType t = iter.type();
1078 if (t == relocInfo::poll_return_type || t == relocInfo::poll_type)
1079 return true;
1080 }
1081 return false;
1082 }
1083
1084
1085 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) {
1086 // re-patch all oop-bearing instructions, just in case some oops moved
1087 RelocIterator iter(this, begin, end);
1088 while (iter.next()) {
1089 if (iter.type() == relocInfo::oop_type) {
1090 oop_Relocation* reloc = iter.oop_reloc();
1091 if (initialize_immediates && reloc->oop_is_immediate()) {
1092 oop* dest = reloc->oop_addr();
1093 initialize_immediate_oop(dest, (jobject) *dest);
1094 }
1095 // Refresh the oop-related bits of this instruction.
1096 reloc->fix_oop_relocation();
1097 }
1098
1099 // There must not be any interfering patches or breakpoints.
1100 assert(!(iter.type() == relocInfo::breakpoint_type
1101 && iter.breakpoint_reloc()->active()),
1102 "no active breakpoint");
1103 }
1104 }
1105
1106
1107 ScopeDesc* nmethod::scope_desc_at(address pc) {
1108 PcDesc* pd = pc_desc_at(pc);
1109 guarantee(pd != NULL, "scope must be present");
1110 return new ScopeDesc(this, pd->scope_decode_offset(),
1111 pd->obj_decode_offset(), pd->should_reexecute(),
1112 pd->return_oop());
1113 }
1114
1115
1116 void nmethod::clear_inline_caches() {
1117 assert(SafepointSynchronize::is_at_safepoint(), "cleaning of IC's only allowed at safepoint");
1118 if (is_zombie()) {
1119 return;
1120 }
1121
1122 RelocIterator iter(this);
1123 while (iter.next()) {
1124 iter.reloc()->clear_inline_cache();
1125 }
1126 }
1127
1128
1129 void nmethod::cleanup_inline_caches() {
1130
1131 assert_locked_or_safepoint(CompiledIC_lock);
1132
1133 // If the method is not entrant or zombie then a JMP is plastered over the
1134 // first few bytes. If an oop in the old code was there, that oop
1135 // should not get GC'd. Skip the first few bytes of oops on
1136 // not-entrant methods.
1137 address low_boundary = verified_entry_point();
1138 if (!is_in_use()) {
1139 low_boundary += NativeJump::instruction_size;
1140 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1141 // This means that the low_boundary is going to be a little too high.
1142 // This shouldn't matter, since oops of non-entrant methods are never used.
1143 // In fact, why are we bothering to look at oops in a non-entrant method??
1144 }
1145
1146 // Find all calls in an nmethod, and clear the ones that points to zombie methods
1147 ResourceMark rm;
1148 RelocIterator iter(this, low_boundary);
1149 while(iter.next()) {
1150 switch(iter.type()) {
1151 case relocInfo::virtual_call_type:
1152 case relocInfo::opt_virtual_call_type: {
1153 CompiledIC *ic = CompiledIC_at(iter.reloc());
1154 // Ok, to lookup references to zombies here
1155 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
1156 if( cb != NULL && cb->is_nmethod() ) {
1157 nmethod* nm = (nmethod*)cb;
1158 // Clean inline caches pointing to both zombie and not_entrant methods
1159 if (!nm->is_in_use() || (nm->method()->code() != nm)) ic->set_to_clean();
1160 }
1161 break;
1162 }
1163 case relocInfo::static_call_type: {
1164 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
1165 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
1166 if( cb != NULL && cb->is_nmethod() ) {
1167 nmethod* nm = (nmethod*)cb;
1168 // Clean inline caches pointing to both zombie and not_entrant methods
1169 if (!nm->is_in_use() || (nm->method()->code() != nm)) csc->set_to_clean();
1170 }
1171 break;
1172 }
1173 }
1174 }
1175 }
1176
1177 // This is a private interface with the sweeper.
1178 void nmethod::mark_as_seen_on_stack() {
1179 assert(is_not_entrant(), "must be a non-entrant method");
1180 // Set the traversal mark to ensure that the sweeper does 2
1181 // cleaning passes before moving to zombie.
1182 set_stack_traversal_mark(NMethodSweeper::traversal_count());
1183 }
1184
1185 // Tell if a non-entrant method can be converted to a zombie (i.e., there is no activations on the stack)
1186 bool nmethod::can_not_entrant_be_converted() {
1187 assert(is_not_entrant(), "must be a non-entrant method");
1188
1189 // Since the nmethod sweeper only does partial sweep the sweeper's traversal
1190 // count can be greater than the stack traversal count before it hits the
1191 // nmethod for the second time.
1192 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count();
1193 }
1194
1195 void nmethod::inc_decompile_count() {
1196 if (!is_compiled_by_c2()) return;
1197 // Could be gated by ProfileTraps, but do not bother...
1198 methodOop m = method();
1199 if (m == NULL) return;
1200 methodDataOop mdo = m->method_data();
1201 if (mdo == NULL) return;
1202 // There is a benign race here. See comments in methodDataOop.hpp.
1203 mdo->inc_decompile_count();
1204 }
1205
1206 void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) {
1207
1208 post_compiled_method_unload();
1209
1210 // Since this nmethod is being unloaded, make sure that dependencies
1211 // recorded in instanceKlasses get flushed and pass non-NULL closure to
1212 // indicate that this work is being done during a GC.
1213 assert(Universe::heap()->is_gc_active(), "should only be called during gc");
1214 assert(is_alive != NULL, "Should be non-NULL");
1215 // A non-NULL is_alive closure indicates that this is being called during GC.
1216 flush_dependencies(is_alive);
1217
1218 // Break cycle between nmethod & method
1219 if (TraceClassUnloading && WizardMode) {
1220 tty->print_cr("[Class unloading: Making nmethod " INTPTR_FORMAT
1221 " unloadable], methodOop(" INTPTR_FORMAT
1222 "), cause(" INTPTR_FORMAT ")",
1223 this, (address)_method, (address)cause);
1224 if (!Universe::heap()->is_gc_active())
1225 cause->klass()->print();
1226 }
1227 // Unlink the osr method, so we do not look this up again
1228 if (is_osr_method()) {
1229 invalidate_osr_method();
1230 }
1231 // If _method is already NULL the methodOop is about to be unloaded,
1232 // so we don't have to break the cycle. Note that it is possible to
1233 // have the methodOop live here, in case we unload the nmethod because
1234 // it is pointing to some oop (other than the methodOop) being unloaded.
1235 if (_method != NULL) {
1236 // OSR methods point to the methodOop, but the methodOop does not
1237 // point back!
1238 if (_method->code() == this) {
1239 _method->clear_code(); // Break a cycle
1240 }
1241 _method = NULL; // Clear the method of this dead nmethod
1242 }
1243 // Make the class unloaded - i.e., change state and notify sweeper
1244 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
1245 if (is_in_use()) {
1246 // Transitioning directly from live to unloaded -- so
1247 // we need to force a cache clean-up; remember this
1248 // for later on.
1249 CodeCache::set_needs_cache_clean(true);
1250 }
1251 _state = unloaded;
1252
1253 // Log the unloading.
1254 log_state_change();
1255
1256 // The methodOop is gone at this point
1257 assert(_method == NULL, "Tautology");
1258
1259 set_osr_link(NULL);
1260 //set_scavenge_root_link(NULL); // done by prune_scavenge_root_nmethods
1261 NMethodSweeper::notify(this);
1262 }
1263
1264 void nmethod::invalidate_osr_method() {
1265 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
1266 // Remove from list of active nmethods
1267 if (method() != NULL)
1268 instanceKlass::cast(method()->method_holder())->remove_osr_nmethod(this);
1269 // Set entry as invalid
1270 _entry_bci = InvalidOSREntryBci;
1271 }
1272
1273 void nmethod::log_state_change() const {
1274 if (LogCompilation) {
1275 if (xtty != NULL) {
1276 ttyLocker ttyl; // keep the following output all in one block
1277 if (_state == unloaded) {
1278 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'",
1279 os::current_thread_id());
1280 } else {
1281 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s",
1282 os::current_thread_id(),
1283 (_state == zombie ? " zombie='1'" : ""));
1284 }
1285 log_identity(xtty);
1286 xtty->stamp();
1287 xtty->end_elem();
1288 }
1289 }
1290 if (PrintCompilation && _state != unloaded) {
1291 print_on(tty, _state == zombie ? "made zombie " : "made not entrant ");
1292 tty->cr();
1293 }
1294 }
1295
1296 // Common functionality for both make_not_entrant and make_zombie
1297 bool nmethod::make_not_entrant_or_zombie(unsigned int state) {
1298 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant");
1299
1300 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below.
1301 nmethodLocker nml(this);
1302 methodHandle the_method(method());
1303 No_Safepoint_Verifier nsv;
1304
1305 {
1306 // If the method is already zombie there is nothing to do
1307 if (is_zombie()) {
1308 return false;
1309 }
1310
1311 // invalidate osr nmethod before acquiring the patching lock since
1312 // they both acquire leaf locks and we don't want a deadlock.
1313 // This logic is equivalent to the logic below for patching the
1314 // verified entry point of regular methods.
1315 if (is_osr_method()) {
1316 // this effectively makes the osr nmethod not entrant
1317 invalidate_osr_method();
1318 }
1319
1320 // Enter critical section. Does not block for safepoint.
1321 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1322
1323 if (_state == state) {
1324 // another thread already performed this transition so nothing
1325 // to do, but return false to indicate this.
1326 return false;
1327 }
1328
1329 // The caller can be calling the method statically or through an inline
1330 // cache call.
1331 if (!is_osr_method() && !is_not_entrant()) {
1332 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
1333 SharedRuntime::get_handle_wrong_method_stub());
1334 }
1335
1336 if (is_in_use()) {
1337 // It's a true state change, so mark the method as decompiled.
1338 // Do it only for transition from alive.
1339 inc_decompile_count();
1340 }
1341
1342 // Change state
1343 _state = state;
1344
1345 // Log the transition once
1346 log_state_change();
1347
1348 // Remove nmethod from method.
1349 // We need to check if both the _code and _from_compiled_code_entry_point
1350 // refer to this nmethod because there is a race in setting these two fields
1351 // in methodOop as seen in bugid 4947125.
1352 // If the vep() points to the zombie nmethod, the memory for the nmethod
1353 // could be flushed and the compiler and vtable stubs could still call
1354 // through it.
1355 if (method() != NULL && (method()->code() == this ||
1356 method()->from_compiled_entry() == verified_entry_point())) {
1357 HandleMark hm;
1358 method()->clear_code();
1359 }
1360
1361 if (state == not_entrant) {
1362 mark_as_seen_on_stack();
1363 }
1364
1365 } // leave critical region under Patching_lock
1366
1367 // When the nmethod becomes zombie it is no longer alive so the
1368 // dependencies must be flushed. nmethods in the not_entrant
1369 // state will be flushed later when the transition to zombie
1370 // happens or they get unloaded.
1371 if (state == zombie) {
1372 {
1373 // Flushing dependecies must be done before any possible
1374 // safepoint can sneak in, otherwise the oops used by the
1375 // dependency logic could have become stale.
1376 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1377 flush_dependencies(NULL);
1378 }
1379
1380 {
1381 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload event
1382 // and it hasn't already been reported for this nmethod then report it now.
1383 // (the event may have been reported earilier if the GC marked it for unloading).
1384 Pause_No_Safepoint_Verifier pnsv(&nsv);
1385 post_compiled_method_unload();
1386 }
1387
1388 #ifdef ASSERT
1389 // It's no longer safe to access the oops section since zombie
1390 // nmethods aren't scanned for GC.
1391 _oops_are_stale = true;
1392 #endif
1393 } else {
1394 assert(state == not_entrant, "other cases may need to be handled differently");
1395 }
1396
1397 if (TraceCreateZombies) {
1398 tty->print_cr("nmethod <" INTPTR_FORMAT "> code made %s", this, (state == not_entrant) ? "not entrant" : "zombie");
1399 }
1400
1401 // Make sweeper aware that there is a zombie method that needs to be removed
1402 NMethodSweeper::notify(this);
1403
1404 return true;
1405 }
1406
1407 void nmethod::flush() {
1408 // Note that there are no valid oops in the nmethod anymore.
1409 assert(is_zombie() || (is_osr_method() && is_unloaded()), "must be a zombie method");
1410 assert(is_marked_for_reclamation() || (is_osr_method() && is_unloaded()), "must be marked for reclamation");
1411
1412 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed");
1413 assert_locked_or_safepoint(CodeCache_lock);
1414
1415 // completely deallocate this method
1416 EventMark m("flushing nmethod " INTPTR_FORMAT " %s", this, "");
1417 if (PrintMethodFlushing) {
1418 tty->print_cr("*flushing nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT "/Free CodeCache:" SIZE_FORMAT "Kb",
1419 _compile_id, this, CodeCache::nof_blobs(), CodeCache::unallocated_capacity()/1024);
1420 }
1421
1422 // We need to deallocate any ExceptionCache data.
1423 // Note that we do not need to grab the nmethod lock for this, it
1424 // better be thread safe if we're disposing of it!
1425 ExceptionCache* ec = exception_cache();
1426 set_exception_cache(NULL);
1427 while(ec != NULL) {
1428 ExceptionCache* next = ec->next();
1429 delete ec;
1430 ec = next;
1431 }
1432
1433 if (on_scavenge_root_list()) {
1434 CodeCache::drop_scavenge_root_nmethod(this);
1435 }
1436
1437 if (is_speculatively_disconnected()) {
1438 CodeCache::remove_saved_code(this);
1439 }
1440
1441 #ifdef SHARK
1442 ((SharkCompiler *) compiler())->free_compiled_method(insts_begin());
1443 #endif // SHARK
1444
1445 ((CodeBlob*)(this))->flush();
1446
1447 CodeCache::free(this);
1448 }
1449
1450
1451 //
1452 // Notify all classes this nmethod is dependent on that it is no
1453 // longer dependent. This should only be called in two situations.
1454 // First, when a nmethod transitions to a zombie all dependents need
1455 // to be clear. Since zombification happens at a safepoint there's no
1456 // synchronization issues. The second place is a little more tricky.
1457 // During phase 1 of mark sweep class unloading may happen and as a
1458 // result some nmethods may get unloaded. In this case the flushing
1459 // of dependencies must happen during phase 1 since after GC any
1460 // dependencies in the unloaded nmethod won't be updated, so
1461 // traversing the dependency information in unsafe. In that case this
1462 // function is called with a non-NULL argument and this function only
1463 // notifies instanceKlasses that are reachable
1464
1465 void nmethod::flush_dependencies(BoolObjectClosure* is_alive) {
1466 assert_locked_or_safepoint(CodeCache_lock);
1467 assert(Universe::heap()->is_gc_active() == (is_alive != NULL),
1468 "is_alive is non-NULL if and only if we are called during GC");
1469 if (!has_flushed_dependencies()) {
1470 set_has_flushed_dependencies();
1471 for (Dependencies::DepStream deps(this); deps.next(); ) {
1472 klassOop klass = deps.context_type();
1473 if (klass == NULL) continue; // ignore things like evol_method
1474
1475 // During GC the is_alive closure is non-NULL, and is used to
1476 // determine liveness of dependees that need to be updated.
1477 if (is_alive == NULL || is_alive->do_object_b(klass)) {
1478 instanceKlass::cast(klass)->remove_dependent_nmethod(this);
1479 }
1480 }
1481 }
1482 }
1483
1484
1485 // If this oop is not live, the nmethod can be unloaded.
1486 bool nmethod::can_unload(BoolObjectClosure* is_alive,
1487 OopClosure* keep_alive,
1488 oop* root, bool unloading_occurred) {
1489 assert(root != NULL, "just checking");
1490 oop obj = *root;
1491 if (obj == NULL || is_alive->do_object_b(obj)) {
1492 return false;
1493 }
1494 if (obj->is_compiledICHolder()) {
1495 compiledICHolderOop cichk_oop = compiledICHolderOop(obj);
1496 if (is_alive->do_object_b(
1497 cichk_oop->holder_method()->method_holder()) &&
1498 is_alive->do_object_b(cichk_oop->holder_klass())) {
1499 // The oop should be kept alive
1500 keep_alive->do_oop(root);
1501 return false;
1502 }
1503 }
1504 // If ScavengeRootsInCode is true, an nmethod might be unloaded
1505 // simply because one of its constant oops has gone dead.
1506 // No actual classes need to be unloaded in order for this to occur.
1507 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading");
1508 make_unloaded(is_alive, obj);
1509 return true;
1510 }
1511
1512 // ------------------------------------------------------------------
1513 // post_compiled_method_load_event
1514 // new method for install_code() path
1515 // Transfer information from compilation to jvmti
1516 void nmethod::post_compiled_method_load_event() {
1517
1518 methodOop moop = method();
1519 HS_DTRACE_PROBE8(hotspot, compiled__method__load,
1520 moop->klass_name()->bytes(),
1521 moop->klass_name()->utf8_length(),
1522 moop->name()->bytes(),
1523 moop->name()->utf8_length(),
1524 moop->signature()->bytes(),
1525 moop->signature()->utf8_length(),
1526 insts_begin(), insts_size());
1527
1528 if (JvmtiExport::should_post_compiled_method_load() ||
1529 JvmtiExport::should_post_compiled_method_unload()) {
1530 get_and_cache_jmethod_id();
1531 }
1532
1533 if (JvmtiExport::should_post_compiled_method_load()) {
1534 JvmtiExport::post_compiled_method_load(this);
1535 }
1536 }
1537
1538 jmethodID nmethod::get_and_cache_jmethod_id() {
1539 if (_jmethod_id == NULL) {
1540 // Cache the jmethod_id since it can no longer be looked up once the
1541 // method itself has been marked for unloading.
1542 _jmethod_id = method()->jmethod_id();
1543 }
1544 return _jmethod_id;
1545 }
1546
1547 void nmethod::post_compiled_method_unload() {
1548 if (unload_reported()) {
1549 // During unloading we transition to unloaded and then to zombie
1550 // and the unloading is reported during the first transition.
1551 return;
1552 }
1553
1554 assert(_method != NULL && !is_unloaded(), "just checking");
1555 DTRACE_METHOD_UNLOAD_PROBE(method());
1556
1557 // If a JVMTI agent has enabled the CompiledMethodUnload event then
1558 // post the event. Sometime later this nmethod will be made a zombie
1559 // by the sweeper but the methodOop will not be valid at that point.
1560 // If the _jmethod_id is null then no load event was ever requested
1561 // so don't bother posting the unload. The main reason for this is
1562 // that the jmethodID is a weak reference to the methodOop so if
1563 // it's being unloaded there's no way to look it up since the weak
1564 // ref will have been cleared.
1565 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) {
1566 assert(!unload_reported(), "already unloaded");
1567 HandleMark hm;
1568 JvmtiExport::post_compiled_method_unload(_jmethod_id, insts_begin());
1569 }
1570
1571 // The JVMTI CompiledMethodUnload event can be enabled or disabled at
1572 // any time. As the nmethod is being unloaded now we mark it has
1573 // having the unload event reported - this will ensure that we don't
1574 // attempt to report the event in the unlikely scenario where the
1575 // event is enabled at the time the nmethod is made a zombie.
1576 set_unload_reported();
1577 }
1578
1579 // This is called at the end of the strong tracing/marking phase of a
1580 // GC to unload an nmethod if it contains otherwise unreachable
1581 // oops.
1582
1583 void nmethod::do_unloading(BoolObjectClosure* is_alive,
1584 OopClosure* keep_alive, bool unloading_occurred) {
1585 // Make sure the oop's ready to receive visitors
1586 assert(!is_zombie() && !is_unloaded(),
1587 "should not call follow on zombie or unloaded nmethod");
1588
1589 // If the method is not entrant then a JMP is plastered over the
1590 // first few bytes. If an oop in the old code was there, that oop
1591 // should not get GC'd. Skip the first few bytes of oops on
1592 // not-entrant methods.
1593 address low_boundary = verified_entry_point();
1594 if (is_not_entrant()) {
1595 low_boundary += NativeJump::instruction_size;
1596 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1597 // (See comment above.)
1598 }
1599
1600 // The RedefineClasses() API can cause the class unloading invariant
1601 // to no longer be true. See jvmtiExport.hpp for details.
1602 // Also, leave a debugging breadcrumb in local flag.
1603 bool a_class_was_redefined = JvmtiExport::has_redefined_a_class();
1604 if (a_class_was_redefined) {
1605 // This set of the unloading_occurred flag is done before the
1606 // call to post_compiled_method_unload() so that the unloading
1607 // of this nmethod is reported.
1608 unloading_occurred = true;
1609 }
1610
1611 // Follow methodOop
1612 if (can_unload(is_alive, keep_alive, (oop*)&_method, unloading_occurred)) {
1613 return;
1614 }
1615
1616 // Exception cache
1617 ExceptionCache* ec = exception_cache();
1618 while (ec != NULL) {
1619 oop* ex_addr = (oop*)ec->exception_type_addr();
1620 oop ex = *ex_addr;
1621 ExceptionCache* next_ec = ec->next();
1622 if (ex != NULL && !is_alive->do_object_b(ex)) {
1623 assert(!ex->is_compiledICHolder(), "Possible error here");
1624 remove_from_exception_cache(ec);
1625 }
1626 ec = next_ec;
1627 }
1628
1629 // If class unloading occurred we first iterate over all inline caches and
1630 // clear ICs where the cached oop is referring to an unloaded klass or method.
1631 // The remaining live cached oops will be traversed in the relocInfo::oop_type
1632 // iteration below.
1633 if (unloading_occurred) {
1634 RelocIterator iter(this, low_boundary);
1635 while(iter.next()) {
1636 if (iter.type() == relocInfo::virtual_call_type) {
1637 CompiledIC *ic = CompiledIC_at(iter.reloc());
1638 oop ic_oop = ic->cached_oop();
1639 if (ic_oop != NULL && !is_alive->do_object_b(ic_oop)) {
1640 // The only exception is compiledICHolder oops which may
1641 // yet be marked below. (We check this further below).
1642 if (ic_oop->is_compiledICHolder()) {
1643 compiledICHolderOop cichk_oop = compiledICHolderOop(ic_oop);
1644 if (is_alive->do_object_b(
1645 cichk_oop->holder_method()->method_holder()) &&
1646 is_alive->do_object_b(cichk_oop->holder_klass())) {
1647 continue;
1648 }
1649 }
1650 ic->set_to_clean();
1651 assert(ic->cached_oop() == NULL,
1652 "cached oop in IC should be cleared");
1653 }
1654 }
1655 }
1656 }
1657
1658 // Compiled code
1659 RelocIterator iter(this, low_boundary);
1660 while (iter.next()) {
1661 if (iter.type() == relocInfo::oop_type) {
1662 oop_Relocation* r = iter.oop_reloc();
1663 // In this loop, we must only traverse those oops directly embedded in
1664 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1665 assert(1 == (r->oop_is_immediate()) +
1666 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1667 "oop must be found in exactly one place");
1668 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1669 if (can_unload(is_alive, keep_alive, r->oop_addr(), unloading_occurred)) {
1670 return;
1671 }
1672 }
1673 }
1674 }
1675
1676
1677 // Scopes
1678 for (oop* p = oops_begin(); p < oops_end(); p++) {
1679 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1680 if (can_unload(is_alive, keep_alive, p, unloading_occurred)) {
1681 return;
1682 }
1683 }
1684
1685 #ifndef PRODUCT
1686 // This nmethod was not unloaded; check below that all CompiledICs
1687 // refer to marked oops.
1688 {
1689 RelocIterator iter(this, low_boundary);
1690 while (iter.next()) {
1691 if (iter.type() == relocInfo::virtual_call_type) {
1692 CompiledIC *ic = CompiledIC_at(iter.reloc());
1693 oop ic_oop = ic->cached_oop();
1694 assert(ic_oop == NULL || is_alive->do_object_b(ic_oop),
1695 "Found unmarked ic_oop in reachable nmethod");
1696 }
1697 }
1698 }
1699 #endif // !PRODUCT
1700 }
1701
1702 // This method is called twice during GC -- once while
1703 // tracing the "active" nmethods on thread stacks during
1704 // the (strong) marking phase, and then again when walking
1705 // the code cache contents during the weak roots processing
1706 // phase. The two uses are distinguished by means of the
1707 // 'do_strong_roots_only' flag, which is true in the first
1708 // case. We want to walk the weak roots in the nmethod
1709 // only in the second case. The weak roots in the nmethod
1710 // are the oops in the ExceptionCache and the InlineCache
1711 // oops.
1712 void nmethod::oops_do(OopClosure* f, bool do_strong_roots_only) {
1713 // make sure the oops ready to receive visitors
1714 assert(!is_zombie() && !is_unloaded(),
1715 "should not call follow on zombie or unloaded nmethod");
1716
1717 // If the method is not entrant or zombie then a JMP is plastered over the
1718 // first few bytes. If an oop in the old code was there, that oop
1719 // should not get GC'd. Skip the first few bytes of oops on
1720 // not-entrant methods.
1721 address low_boundary = verified_entry_point();
1722 if (is_not_entrant()) {
1723 low_boundary += NativeJump::instruction_size;
1724 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1725 // (See comment above.)
1726 }
1727
1728 // Compiled code
1729 f->do_oop((oop*) &_method);
1730 if (!do_strong_roots_only) {
1731 // weak roots processing phase -- update ExceptionCache oops
1732 ExceptionCache* ec = exception_cache();
1733 while(ec != NULL) {
1734 f->do_oop((oop*)ec->exception_type_addr());
1735 ec = ec->next();
1736 }
1737 } // Else strong roots phase -- skip oops in ExceptionCache
1738
1739 RelocIterator iter(this, low_boundary);
1740
1741 while (iter.next()) {
1742 if (iter.type() == relocInfo::oop_type ) {
1743 oop_Relocation* r = iter.oop_reloc();
1744 // In this loop, we must only follow those oops directly embedded in
1745 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1746 assert(1 == (r->oop_is_immediate()) +
1747 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1748 "oop must be found in exactly one place");
1749 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1750 f->do_oop(r->oop_addr());
1751 }
1752 }
1753 }
1754
1755 // Scopes
1756 // This includes oop constants not inlined in the code stream.
1757 for (oop* p = oops_begin(); p < oops_end(); p++) {
1758 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1759 f->do_oop(p);
1760 }
1761 }
1762
1763 #define NMETHOD_SENTINEL ((nmethod*)badAddress)
1764
1765 nmethod* volatile nmethod::_oops_do_mark_nmethods;
1766
1767 // An nmethod is "marked" if its _mark_link is set non-null.
1768 // Even if it is the end of the linked list, it will have a non-null link value,
1769 // as long as it is on the list.
1770 // This code must be MP safe, because it is used from parallel GC passes.
1771 bool nmethod::test_set_oops_do_mark() {
1772 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");
1773 nmethod* observed_mark_link = _oops_do_mark_link;
1774 if (observed_mark_link == NULL) {
1775 // Claim this nmethod for this thread to mark.
1776 observed_mark_link = (nmethod*)
1777 Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_link, NULL);
1778 if (observed_mark_link == NULL) {
1779
1780 // Atomically append this nmethod (now claimed) to the head of the list:
1781 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods;
1782 for (;;) {
1783 nmethod* required_mark_nmethods = observed_mark_nmethods;
1784 _oops_do_mark_link = required_mark_nmethods;
1785 observed_mark_nmethods = (nmethod*)
1786 Atomic::cmpxchg_ptr(this, &_oops_do_mark_nmethods, required_mark_nmethods);
1787 if (observed_mark_nmethods == required_mark_nmethods)
1788 break;
1789 }
1790 // Mark was clear when we first saw this guy.
1791 NOT_PRODUCT(if (TraceScavenge) print_on(tty, "oops_do, mark\n"));
1792 return false;
1793 }
1794 }
1795 // On fall through, another racing thread marked this nmethod before we did.
1796 return true;
1797 }
1798
1799 void nmethod::oops_do_marking_prologue() {
1800 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("[oops_do_marking_prologue"));
1801 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row");
1802 // We use cmpxchg_ptr instead of regular assignment here because the user
1803 // may fork a bunch of threads, and we need them all to see the same state.
1804 void* observed = Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, NULL);
1805 guarantee(observed == NULL, "no races in this sequential code");
1806 }
1807
1808 void nmethod::oops_do_marking_epilogue() {
1809 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row");
1810 nmethod* cur = _oops_do_mark_nmethods;
1811 while (cur != NMETHOD_SENTINEL) {
1812 assert(cur != NULL, "not NULL-terminated");
1813 nmethod* next = cur->_oops_do_mark_link;
1814 cur->_oops_do_mark_link = NULL;
1815 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark\n"));
1816 cur = next;
1817 }
1818 void* required = _oops_do_mark_nmethods;
1819 void* observed = Atomic::cmpxchg_ptr(NULL, &_oops_do_mark_nmethods, required);
1820 guarantee(observed == required, "no races in this sequential code");
1821 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("oops_do_marking_epilogue]"));
1822 }
1823
1824 class DetectScavengeRoot: public OopClosure {
1825 bool _detected_scavenge_root;
1826 public:
1827 DetectScavengeRoot() : _detected_scavenge_root(false)
1828 { NOT_PRODUCT(_print_nm = NULL); }
1829 bool detected_scavenge_root() { return _detected_scavenge_root; }
1830 virtual void do_oop(oop* p) {
1831 if ((*p) != NULL && (*p)->is_scavengable()) {
1832 NOT_PRODUCT(maybe_print(p));
1833 _detected_scavenge_root = true;
1834 }
1835 }
1836 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
1837
1838 #ifndef PRODUCT
1839 nmethod* _print_nm;
1840 void maybe_print(oop* p) {
1841 if (_print_nm == NULL) return;
1842 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root");
1843 tty->print_cr(""PTR_FORMAT"[offset=%d] detected non-perm oop "PTR_FORMAT" (found at "PTR_FORMAT")",
1844 _print_nm, (int)((intptr_t)p - (intptr_t)_print_nm),
1845 (intptr_t)(*p), (intptr_t)p);
1846 (*p)->print();
1847 }
1848 #endif //PRODUCT
1849 };
1850
1851 bool nmethod::detect_scavenge_root_oops() {
1852 DetectScavengeRoot detect_scavenge_root;
1853 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this);
1854 oops_do(&detect_scavenge_root);
1855 return detect_scavenge_root.detected_scavenge_root();
1856 }
1857
1858 // Method that knows how to preserve outgoing arguments at call. This method must be
1859 // called with a frame corresponding to a Java invoke
1860 void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) {
1861 #ifndef SHARK
1862 if (!method()->is_native()) {
1863 SimpleScopeDesc ssd(this, fr.pc());
1864 Bytecode_invoke* call = Bytecode_invoke_at(ssd.method(), ssd.bci());
1865 bool has_receiver = call->has_receiver();
1866 symbolOop signature = call->signature();
1867 fr.oops_compiled_arguments_do(signature, has_receiver, reg_map, f);
1868 }
1869 #endif // !SHARK
1870 }
1871
1872
1873 oop nmethod::embeddedOop_at(u_char* p) {
1874 RelocIterator iter(this, p, p + oopSize);
1875 while (iter.next())
1876 if (iter.type() == relocInfo::oop_type) {
1877 return iter.oop_reloc()->oop_value();
1878 }
1879 return NULL;
1880 }
1881
1882
1883 inline bool includes(void* p, void* from, void* to) {
1884 return from <= p && p < to;
1885 }
1886
1887
1888 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
1889 assert(count >= 2, "must be sentinel values, at least");
1890
1891 #ifdef ASSERT
1892 // must be sorted and unique; we do a binary search in find_pc_desc()
1893 int prev_offset = pcs[0].pc_offset();
1894 assert(prev_offset == PcDesc::lower_offset_limit,
1895 "must start with a sentinel");
1896 for (int i = 1; i < count; i++) {
1897 int this_offset = pcs[i].pc_offset();
1898 assert(this_offset > prev_offset, "offsets must be sorted");
1899 prev_offset = this_offset;
1900 }
1901 assert(prev_offset == PcDesc::upper_offset_limit,
1902 "must end with a sentinel");
1903 #endif //ASSERT
1904
1905 // Search for MethodHandle invokes and tag the nmethod.
1906 for (int i = 0; i < count; i++) {
1907 if (pcs[i].is_method_handle_invoke()) {
1908 set_has_method_handle_invokes(true);
1909 break;
1910 }
1911 }
1912
1913 int size = count * sizeof(PcDesc);
1914 assert(scopes_pcs_size() >= size, "oob");
1915 memcpy(scopes_pcs_begin(), pcs, size);
1916
1917 // Adjust the final sentinel downward.
1918 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
1919 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
1920 last_pc->set_pc_offset(content_size() + 1);
1921 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
1922 // Fill any rounding gaps with copies of the last record.
1923 last_pc[1] = last_pc[0];
1924 }
1925 // The following assert could fail if sizeof(PcDesc) is not
1926 // an integral multiple of oopSize (the rounding term).
1927 // If it fails, change the logic to always allocate a multiple
1928 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
1929 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
1930 }
1931
1932 void nmethod::copy_scopes_data(u_char* buffer, int size) {
1933 assert(scopes_data_size() >= size, "oob");
1934 memcpy(scopes_data_begin(), buffer, size);
1935 }
1936
1937
1938 #ifdef ASSERT
1939 static PcDesc* linear_search(nmethod* nm, int pc_offset, bool approximate) {
1940 PcDesc* lower = nm->scopes_pcs_begin();
1941 PcDesc* upper = nm->scopes_pcs_end();
1942 lower += 1; // exclude initial sentinel
1943 PcDesc* res = NULL;
1944 for (PcDesc* p = lower; p < upper; p++) {
1945 NOT_PRODUCT(--nmethod_stats.pc_desc_tests); // don't count this call to match_desc
1946 if (match_desc(p, pc_offset, approximate)) {
1947 if (res == NULL)
1948 res = p;
1949 else
1950 res = (PcDesc*) badAddress;
1951 }
1952 }
1953 return res;
1954 }
1955 #endif
1956
1957
1958 // Finds a PcDesc with real-pc equal to "pc"
1959 PcDesc* nmethod::find_pc_desc_internal(address pc, bool approximate) {
1960 address base_address = code_begin();
1961 if ((pc < base_address) ||
1962 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
1963 return NULL; // PC is wildly out of range
1964 }
1965 int pc_offset = (int) (pc - base_address);
1966
1967 // Check the PcDesc cache if it contains the desired PcDesc
1968 // (This as an almost 100% hit rate.)
1969 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
1970 if (res != NULL) {
1971 assert(res == linear_search(this, pc_offset, approximate), "cache ok");
1972 return res;
1973 }
1974
1975 // Fallback algorithm: quasi-linear search for the PcDesc
1976 // Find the last pc_offset less than the given offset.
1977 // The successor must be the required match, if there is a match at all.
1978 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
1979 PcDesc* lower = scopes_pcs_begin();
1980 PcDesc* upper = scopes_pcs_end();
1981 upper -= 1; // exclude final sentinel
1982 if (lower >= upper) return NULL; // native method; no PcDescs at all
1983
1984 #define assert_LU_OK \
1985 /* invariant on lower..upper during the following search: */ \
1986 assert(lower->pc_offset() < pc_offset, "sanity"); \
1987 assert(upper->pc_offset() >= pc_offset, "sanity")
1988 assert_LU_OK;
1989
1990 // Use the last successful return as a split point.
1991 PcDesc* mid = _pc_desc_cache.last_pc_desc();
1992 NOT_PRODUCT(++nmethod_stats.pc_desc_searches);
1993 if (mid->pc_offset() < pc_offset) {
1994 lower = mid;
1995 } else {
1996 upper = mid;
1997 }
1998
1999 // Take giant steps at first (4096, then 256, then 16, then 1)
2000 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
2001 const int RADIX = (1 << LOG2_RADIX);
2002 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
2003 while ((mid = lower + step) < upper) {
2004 assert_LU_OK;
2005 NOT_PRODUCT(++nmethod_stats.pc_desc_searches);
2006 if (mid->pc_offset() < pc_offset) {
2007 lower = mid;
2008 } else {
2009 upper = mid;
2010 break;
2011 }
2012 }
2013 assert_LU_OK;
2014 }
2015
2016 // Sneak up on the value with a linear search of length ~16.
2017 while (true) {
2018 assert_LU_OK;
2019 mid = lower + 1;
2020 NOT_PRODUCT(++nmethod_stats.pc_desc_searches);
2021 if (mid->pc_offset() < pc_offset) {
2022 lower = mid;
2023 } else {
2024 upper = mid;
2025 break;
2026 }
2027 }
2028 #undef assert_LU_OK
2029
2030 if (match_desc(upper, pc_offset, approximate)) {
2031 assert(upper == linear_search(this, pc_offset, approximate), "search ok");
2032 _pc_desc_cache.add_pc_desc(upper);
2033 return upper;
2034 } else {
2035 assert(NULL == linear_search(this, pc_offset, approximate), "search ok");
2036 return NULL;
2037 }
2038 }
2039
2040
2041 bool nmethod::check_all_dependencies() {
2042 bool found_check = false;
2043 // wholesale check of all dependencies
2044 for (Dependencies::DepStream deps(this); deps.next(); ) {
2045 if (deps.check_dependency() != NULL) {
2046 found_check = true;
2047 NOT_DEBUG(break);
2048 }
2049 }
2050 return found_check; // tell caller if we found anything
2051 }
2052
2053 bool nmethod::check_dependency_on(DepChange& changes) {
2054 // What has happened:
2055 // 1) a new class dependee has been added
2056 // 2) dependee and all its super classes have been marked
2057 bool found_check = false; // set true if we are upset
2058 for (Dependencies::DepStream deps(this); deps.next(); ) {
2059 // Evaluate only relevant dependencies.
2060 if (deps.spot_check_dependency_at(changes) != NULL) {
2061 found_check = true;
2062 NOT_DEBUG(break);
2063 }
2064 }
2065 return found_check;
2066 }
2067
2068 bool nmethod::is_evol_dependent_on(klassOop dependee) {
2069 instanceKlass *dependee_ik = instanceKlass::cast(dependee);
2070 objArrayOop dependee_methods = dependee_ik->methods();
2071 for (Dependencies::DepStream deps(this); deps.next(); ) {
2072 if (deps.type() == Dependencies::evol_method) {
2073 methodOop method = deps.method_argument(0);
2074 for (int j = 0; j < dependee_methods->length(); j++) {
2075 if ((methodOop) dependee_methods->obj_at(j) == method) {
2076 // RC_TRACE macro has an embedded ResourceMark
2077 RC_TRACE(0x01000000,
2078 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)",
2079 _method->method_holder()->klass_part()->external_name(),
2080 _method->name()->as_C_string(),
2081 _method->signature()->as_C_string(), compile_id(),
2082 method->method_holder()->klass_part()->external_name(),
2083 method->name()->as_C_string(),
2084 method->signature()->as_C_string()));
2085 if (TraceDependencies || LogCompilation)
2086 deps.log_dependency(dependee);
2087 return true;
2088 }
2089 }
2090 }
2091 }
2092 return false;
2093 }
2094
2095 // Called from mark_for_deoptimization, when dependee is invalidated.
2096 bool nmethod::is_dependent_on_method(methodOop dependee) {
2097 for (Dependencies::DepStream deps(this); deps.next(); ) {
2098 if (deps.type() != Dependencies::evol_method)
2099 continue;
2100 methodOop method = deps.method_argument(0);
2101 if (method == dependee) return true;
2102 }
2103 return false;
2104 }
2105
2106
2107 bool nmethod::is_patchable_at(address instr_addr) {
2108 assert(insts_contains(instr_addr), "wrong nmethod used");
2109 if (is_zombie()) {
2110 // a zombie may never be patched
2111 return false;
2112 }
2113 return true;
2114 }
2115
2116
2117 address nmethod::continuation_for_implicit_exception(address pc) {
2118 // Exception happened outside inline-cache check code => we are inside
2119 // an active nmethod => use cpc to determine a return address
2120 int exception_offset = pc - code_begin();
2121 int cont_offset = ImplicitExceptionTable(this).at( exception_offset );
2122 #ifdef ASSERT
2123 if (cont_offset == 0) {
2124 Thread* thread = ThreadLocalStorage::get_thread_slow();
2125 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
2126 HandleMark hm(thread);
2127 ResourceMark rm(thread);
2128 CodeBlob* cb = CodeCache::find_blob(pc);
2129 assert(cb != NULL && cb == this, "");
2130 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, pc);
2131 print();
2132 method()->print_codes();
2133 print_code();
2134 print_pcs();
2135 }
2136 #endif
2137 if (cont_offset == 0) {
2138 // Let the normal error handling report the exception
2139 return NULL;
2140 }
2141 return code_begin() + cont_offset;
2142 }
2143
2144
2145
2146 void nmethod_init() {
2147 // make sure you didn't forget to adjust the filler fields
2148 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
2149 }
2150
2151
2152 //-------------------------------------------------------------------------------------------
2153
2154
2155 // QQQ might we make this work from a frame??
2156 nmethodLocker::nmethodLocker(address pc) {
2157 CodeBlob* cb = CodeCache::find_blob(pc);
2158 guarantee(cb != NULL && cb->is_nmethod(), "bad pc for a nmethod found");
2159 _nm = (nmethod*)cb;
2160 lock_nmethod(_nm);
2161 }
2162
2163 void nmethodLocker::lock_nmethod(nmethod* nm) {
2164 if (nm == NULL) return;
2165 Atomic::inc(&nm->_lock_count);
2166 guarantee(!nm->is_zombie(), "cannot lock a zombie method");
2167 }
2168
2169 void nmethodLocker::unlock_nmethod(nmethod* nm) {
2170 if (nm == NULL) return;
2171 Atomic::dec(&nm->_lock_count);
2172 guarantee(nm->_lock_count >= 0, "unmatched nmethod lock/unlock");
2173 }
2174
2175
2176 // -----------------------------------------------------------------------------
2177 // nmethod::get_deopt_original_pc
2178 //
2179 // Return the original PC for the given PC if:
2180 // (a) the given PC belongs to a nmethod and
2181 // (b) it is a deopt PC
2182 address nmethod::get_deopt_original_pc(const frame* fr) {
2183 if (fr->cb() == NULL) return NULL;
2184
2185 nmethod* nm = fr->cb()->as_nmethod_or_null();
2186 if (nm != NULL && nm->is_deopt_pc(fr->pc()))
2187 return nm->get_original_pc(fr);
2188
2189 return NULL;
2190 }
2191
2192
2193 // -----------------------------------------------------------------------------
2194 // MethodHandle
2195
2196 bool nmethod::is_method_handle_return(address return_pc) {
2197 if (!has_method_handle_invokes()) return false;
2198 PcDesc* pd = pc_desc_at(return_pc);
2199 if (pd == NULL)
2200 return false;
2201 return pd->is_method_handle_invoke();
2202 }
2203
2204
2205 // -----------------------------------------------------------------------------
2206 // Verification
2207
2208 class VerifyOopsClosure: public OopClosure {
2209 nmethod* _nm;
2210 bool _ok;
2211 public:
2212 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
2213 bool ok() { return _ok; }
2214 virtual void do_oop(oop* p) {
2215 if ((*p) == NULL || (*p)->is_oop()) return;
2216 if (_ok) {
2217 _nm->print_nmethod(true);
2218 _ok = false;
2219 }
2220 tty->print_cr("*** non-oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)",
2221 (intptr_t)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm));
2222 }
2223 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2224 };
2225
2226 void nmethod::verify() {
2227
2228 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant
2229 // seems odd.
2230
2231 if( is_zombie() || is_not_entrant() )
2232 return;
2233
2234 // Make sure all the entry points are correctly aligned for patching.
2235 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
2236
2237 assert(method()->is_oop(), "must be valid");
2238
2239 ResourceMark rm;
2240
2241 if (!CodeCache::contains(this)) {
2242 fatal(err_msg("nmethod at " INTPTR_FORMAT " not in zone", this));
2243 }
2244
2245 if(is_native_method() )
2246 return;
2247
2248 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
2249 if (nm != this) {
2250 fatal(err_msg("findNMethod did not find this nmethod (" INTPTR_FORMAT ")",
2251 this));
2252 }
2253
2254 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2255 if (! p->verify(this)) {
2256 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", this);
2257 }
2258 }
2259
2260 VerifyOopsClosure voc(this);
2261 oops_do(&voc);
2262 assert(voc.ok(), "embedded oops must be OK");
2263 verify_scavenge_root_oops();
2264
2265 verify_scopes();
2266 }
2267
2268
2269 void nmethod::verify_interrupt_point(address call_site) {
2270 // This code does not work in release mode since
2271 // owns_lock only is available in debug mode.
2272 CompiledIC* ic = NULL;
2273 Thread *cur = Thread::current();
2274 if (CompiledIC_lock->owner() == cur ||
2275 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) &&
2276 SafepointSynchronize::is_at_safepoint())) {
2277 ic = CompiledIC_at(call_site);
2278 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
2279 } else {
2280 MutexLocker ml_verify (CompiledIC_lock);
2281 ic = CompiledIC_at(call_site);
2282 }
2283 PcDesc* pd = pc_desc_at(ic->end_of_call());
2284 assert(pd != NULL, "PcDesc must exist");
2285 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(),
2286 pd->obj_decode_offset(), pd->should_reexecute(),
2287 pd->return_oop());
2288 !sd->is_top(); sd = sd->sender()) {
2289 sd->verify();
2290 }
2291 }
2292
2293 void nmethod::verify_scopes() {
2294 if( !method() ) return; // Runtime stubs have no scope
2295 if (method()->is_native()) return; // Ignore stub methods.
2296 // iterate through all interrupt point
2297 // and verify the debug information is valid.
2298 RelocIterator iter((nmethod*)this);
2299 while (iter.next()) {
2300 address stub = NULL;
2301 switch (iter.type()) {
2302 case relocInfo::virtual_call_type:
2303 verify_interrupt_point(iter.addr());
2304 break;
2305 case relocInfo::opt_virtual_call_type:
2306 stub = iter.opt_virtual_call_reloc()->static_stub();
2307 verify_interrupt_point(iter.addr());
2308 break;
2309 case relocInfo::static_call_type:
2310 stub = iter.static_call_reloc()->static_stub();
2311 //verify_interrupt_point(iter.addr());
2312 break;
2313 case relocInfo::runtime_call_type:
2314 address destination = iter.reloc()->value();
2315 // Right now there is no way to find out which entries support
2316 // an interrupt point. It would be nice if we had this
2317 // information in a table.
2318 break;
2319 }
2320 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section");
2321 }
2322 }
2323
2324
2325 // -----------------------------------------------------------------------------
2326 // Non-product code
2327 #ifndef PRODUCT
2328
2329 class DebugScavengeRoot: public OopClosure {
2330 nmethod* _nm;
2331 bool _ok;
2332 public:
2333 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { }
2334 bool ok() { return _ok; }
2335 virtual void do_oop(oop* p) {
2336 if ((*p) == NULL || !(*p)->is_scavengable()) return;
2337 if (_ok) {
2338 _nm->print_nmethod(true);
2339 _ok = false;
2340 }
2341 tty->print_cr("*** non-perm oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)",
2342 (intptr_t)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm));
2343 (*p)->print();
2344 }
2345 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2346 };
2347
2348 void nmethod::verify_scavenge_root_oops() {
2349 if (!on_scavenge_root_list()) {
2350 // Actually look inside, to verify the claim that it's clean.
2351 DebugScavengeRoot debug_scavenge_root(this);
2352 oops_do(&debug_scavenge_root);
2353 if (!debug_scavenge_root.ok())
2354 fatal("found an unadvertised bad non-perm oop in the code cache");
2355 }
2356 assert(scavenge_root_not_marked(), "");
2357 }
2358
2359 #endif // PRODUCT
2360
2361 // Printing operations
2362
2363 void nmethod::print() const {
2364 ResourceMark rm;
2365 ttyLocker ttyl; // keep the following output all in one block
2366
2367 tty->print("Compiled ");
2368
2369 if (is_compiled_by_c1()) {
2370 tty->print("(c1) ");
2371 } else if (is_compiled_by_c2()) {
2372 tty->print("(c2) ");
2373 } else if (is_compiled_by_shark()) {
2374 tty->print("(shark) ");
2375 } else {
2376 tty->print("(nm) ");
2377 }
2378
2379 print_on(tty, "nmethod");
2380 tty->cr();
2381 if (WizardMode) {
2382 tty->print("((nmethod*) "INTPTR_FORMAT ") ", this);
2383 tty->print(" for method " INTPTR_FORMAT , (address)method());
2384 tty->print(" { ");
2385 if (is_in_use()) tty->print("in_use ");
2386 if (is_not_entrant()) tty->print("not_entrant ");
2387 if (is_zombie()) tty->print("zombie ");
2388 if (is_unloaded()) tty->print("unloaded ");
2389 if (on_scavenge_root_list()) tty->print("scavenge_root ");
2390 tty->print_cr("}:");
2391 }
2392 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2393 (address)this,
2394 (address)this + size(),
2395 size());
2396 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2397 relocation_begin(),
2398 relocation_end(),
2399 relocation_size());
2400 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2401 consts_begin(),
2402 consts_end(),
2403 consts_size());
2404 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2405 insts_begin(),
2406 insts_end(),
2407 insts_size());
2408 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2409 stub_begin(),
2410 stub_end(),
2411 stub_size());
2412 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2413 oops_begin(),
2414 oops_end(),
2415 oops_size());
2416 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2417 scopes_data_begin(),
2418 scopes_data_end(),
2419 scopes_data_size());
2420 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2421 scopes_pcs_begin(),
2422 scopes_pcs_end(),
2423 scopes_pcs_size());
2424 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2425 dependencies_begin(),
2426 dependencies_end(),
2427 dependencies_size());
2428 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2429 handler_table_begin(),
2430 handler_table_end(),
2431 handler_table_size());
2432 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2433 nul_chk_table_begin(),
2434 nul_chk_table_end(),
2435 nul_chk_table_size());
2436 }
2437
2438 void nmethod::print_code() {
2439 HandleMark hm;
2440 ResourceMark m;
2441 Disassembler::decode(this);
2442 }
2443
2444
2445 #ifndef PRODUCT
2446
2447 void nmethod::print_scopes() {
2448 // Find the first pc desc for all scopes in the code and print it.
2449 ResourceMark rm;
2450 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2451 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
2452 continue;
2453
2454 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
2455 sd->print_on(tty, p);
2456 }
2457 }
2458
2459 void nmethod::print_dependencies() {
2460 ResourceMark rm;
2461 ttyLocker ttyl; // keep the following output all in one block
2462 tty->print_cr("Dependencies:");
2463 for (Dependencies::DepStream deps(this); deps.next(); ) {
2464 deps.print_dependency();
2465 klassOop ctxk = deps.context_type();
2466 if (ctxk != NULL) {
2467 Klass* k = Klass::cast(ctxk);
2468 if (k->oop_is_instance() && ((instanceKlass*)k)->is_dependent_nmethod(this)) {
2469 tty->print_cr(" [nmethod<=klass]%s", k->external_name());
2470 }
2471 }
2472 deps.log_dependency(); // put it into the xml log also
2473 }
2474 }
2475
2476
2477 void nmethod::print_relocations() {
2478 ResourceMark m; // in case methods get printed via the debugger
2479 tty->print_cr("relocations:");
2480 RelocIterator iter(this);
2481 iter.print();
2482 if (UseRelocIndex) {
2483 jint* index_end = (jint*)relocation_end() - 1;
2484 jint index_size = *index_end;
2485 jint* index_start = (jint*)( (address)index_end - index_size );
2486 tty->print_cr(" index @" INTPTR_FORMAT ": index_size=%d", index_start, index_size);
2487 if (index_size > 0) {
2488 jint* ip;
2489 for (ip = index_start; ip+2 <= index_end; ip += 2)
2490 tty->print_cr(" (%d %d) addr=" INTPTR_FORMAT " @" INTPTR_FORMAT,
2491 ip[0],
2492 ip[1],
2493 header_end()+ip[0],
2494 relocation_begin()-1+ip[1]);
2495 for (; ip < index_end; ip++)
2496 tty->print_cr(" (%d ?)", ip[0]);
2497 tty->print_cr(" @" INTPTR_FORMAT ": index_size=%d", ip, *ip++);
2498 tty->print_cr("reloc_end @" INTPTR_FORMAT ":", ip);
2499 }
2500 }
2501 }
2502
2503
2504 void nmethod::print_pcs() {
2505 ResourceMark m; // in case methods get printed via debugger
2506 tty->print_cr("pc-bytecode offsets:");
2507 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2508 p->print(this);
2509 }
2510 }
2511
2512 #endif // PRODUCT
2513
2514 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
2515 RelocIterator iter(this, begin, end);
2516 bool have_one = false;
2517 while (iter.next()) {
2518 have_one = true;
2519 switch (iter.type()) {
2520 case relocInfo::none: return "no_reloc";
2521 case relocInfo::oop_type: {
2522 stringStream st;
2523 oop_Relocation* r = iter.oop_reloc();
2524 oop obj = r->oop_value();
2525 st.print("oop(");
2526 if (obj == NULL) st.print("NULL");
2527 else obj->print_value_on(&st);
2528 st.print(")");
2529 return st.as_string();
2530 }
2531 case relocInfo::virtual_call_type: return "virtual_call";
2532 case relocInfo::opt_virtual_call_type: return "optimized virtual_call";
2533 case relocInfo::static_call_type: return "static_call";
2534 case relocInfo::static_stub_type: return "static_stub";
2535 case relocInfo::runtime_call_type: return "runtime_call";
2536 case relocInfo::external_word_type: return "external_word";
2537 case relocInfo::internal_word_type: return "internal_word";
2538 case relocInfo::section_word_type: return "section_word";
2539 case relocInfo::poll_type: return "poll";
2540 case relocInfo::poll_return_type: return "poll_return";
2541 case relocInfo::type_mask: return "type_bit_mask";
2542 }
2543 }
2544 return have_one ? "other" : NULL;
2545 }
2546
2547 // Return a the last scope in (begin..end]
2548 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
2549 PcDesc* p = pc_desc_near(begin+1);
2550 if (p != NULL && p->real_pc(this) <= end) {
2551 return new ScopeDesc(this, p->scope_decode_offset(),
2552 p->obj_decode_offset(), p->should_reexecute(),
2553 p->return_oop());
2554 }
2555 return NULL;
2556 }
2557
2558 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) {
2559 if (block_begin == entry_point()) stream->print_cr("[Entry Point]");
2560 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]");
2561 if (block_begin == exception_begin()) stream->print_cr("[Exception Handler]");
2562 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]");
2563 if (block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]");
2564
2565 if (has_method_handle_invokes())
2566 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]");
2567
2568 if (block_begin == consts_begin()) stream->print_cr("[Constants]");
2569
2570 if (block_begin == entry_point()) {
2571 methodHandle m = method();
2572 if (m.not_null()) {
2573 stream->print(" # ");
2574 m->print_value_on(stream);
2575 stream->cr();
2576 }
2577 if (m.not_null() && !is_osr_method()) {
2578 ResourceMark rm;
2579 int sizeargs = m->size_of_parameters();
2580 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
2581 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
2582 {
2583 int sig_index = 0;
2584 if (!m->is_static())
2585 sig_bt[sig_index++] = T_OBJECT; // 'this'
2586 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) {
2587 BasicType t = ss.type();
2588 sig_bt[sig_index++] = t;
2589 if (type2size[t] == 2) {
2590 sig_bt[sig_index++] = T_VOID;
2591 } else {
2592 assert(type2size[t] == 1, "size is 1 or 2");
2593 }
2594 }
2595 assert(sig_index == sizeargs, "");
2596 }
2597 const char* spname = "sp"; // make arch-specific?
2598 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false);
2599 int stack_slot_offset = this->frame_size() * wordSize;
2600 int tab1 = 14, tab2 = 24;
2601 int sig_index = 0;
2602 int arg_index = (m->is_static() ? 0 : -1);
2603 bool did_old_sp = false;
2604 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) {
2605 bool at_this = (arg_index == -1);
2606 bool at_old_sp = false;
2607 BasicType t = (at_this ? T_OBJECT : ss.type());
2608 assert(t == sig_bt[sig_index], "sigs in sync");
2609 if (at_this)
2610 stream->print(" # this: ");
2611 else
2612 stream->print(" # parm%d: ", arg_index);
2613 stream->move_to(tab1);
2614 VMReg fst = regs[sig_index].first();
2615 VMReg snd = regs[sig_index].second();
2616 if (fst->is_reg()) {
2617 stream->print("%s", fst->name());
2618 if (snd->is_valid()) {
2619 stream->print(":%s", snd->name());
2620 }
2621 } else if (fst->is_stack()) {
2622 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
2623 if (offset == stack_slot_offset) at_old_sp = true;
2624 stream->print("[%s+0x%x]", spname, offset);
2625 } else {
2626 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
2627 }
2628 stream->print(" ");
2629 stream->move_to(tab2);
2630 stream->print("= ");
2631 if (at_this) {
2632 m->method_holder()->print_value_on(stream);
2633 } else {
2634 bool did_name = false;
2635 if (!at_this && ss.is_object()) {
2636 symbolOop name = ss.as_symbol_or_null();
2637 if (name != NULL) {
2638 name->print_value_on(stream);
2639 did_name = true;
2640 }
2641 }
2642 if (!did_name)
2643 stream->print("%s", type2name(t));
2644 }
2645 if (at_old_sp) {
2646 stream->print(" (%s of caller)", spname);
2647 did_old_sp = true;
2648 }
2649 stream->cr();
2650 sig_index += type2size[t];
2651 arg_index += 1;
2652 if (!at_this) ss.next();
2653 }
2654 if (!did_old_sp) {
2655 stream->print(" # ");
2656 stream->move_to(tab1);
2657 stream->print("[%s+0x%x]", spname, stack_slot_offset);
2658 stream->print(" (%s of caller)", spname);
2659 stream->cr();
2660 }
2661 }
2662 }
2663 }
2664
2665 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) {
2666 // First, find an oopmap in (begin, end].
2667 // We use the odd half-closed interval so that oop maps and scope descs
2668 // which are tied to the byte after a call are printed with the call itself.
2669 address base = code_begin();
2670 OopMapSet* oms = oop_maps();
2671 if (oms != NULL) {
2672 for (int i = 0, imax = oms->size(); i < imax; i++) {
2673 OopMap* om = oms->at(i);
2674 address pc = base + om->offset();
2675 if (pc > begin) {
2676 if (pc <= end) {
2677 st->move_to(column);
2678 st->print("; ");
2679 om->print_on(st);
2680 }
2681 break;
2682 }
2683 }
2684 }
2685
2686 // Print any debug info present at this pc.
2687 ScopeDesc* sd = scope_desc_in(begin, end);
2688 if (sd != NULL) {
2689 st->move_to(column);
2690 if (sd->bci() == SynchronizationEntryBCI) {
2691 st->print(";*synchronization entry");
2692 } else {
2693 if (sd->method().is_null()) {
2694 st->print("method is NULL");
2695 } else if (sd->method()->is_native()) {
2696 st->print("method is native");
2697 } else {
2698 address bcp = sd->method()->bcp_from(sd->bci());
2699 Bytecodes::Code bc = Bytecodes::java_code_at(bcp);
2700 st->print(";*%s", Bytecodes::name(bc));
2701 switch (bc) {
2702 case Bytecodes::_invokevirtual:
2703 case Bytecodes::_invokespecial:
2704 case Bytecodes::_invokestatic:
2705 case Bytecodes::_invokeinterface:
2706 {
2707 Bytecode_invoke* invoke = Bytecode_invoke_at(sd->method(), sd->bci());
2708 st->print(" ");
2709 if (invoke->name() != NULL)
2710 invoke->name()->print_symbol_on(st);
2711 else
2712 st->print("<UNKNOWN>");
2713 break;
2714 }
2715 case Bytecodes::_getfield:
2716 case Bytecodes::_putfield:
2717 case Bytecodes::_getstatic:
2718 case Bytecodes::_putstatic:
2719 {
2720 Bytecode_field* field = Bytecode_field_at(sd->method(), sd->bci());
2721 st->print(" ");
2722 if (field->name() != NULL)
2723 field->name()->print_symbol_on(st);
2724 else
2725 st->print("<UNKNOWN>");
2726 }
2727 }
2728 }
2729 }
2730
2731 // Print all scopes
2732 for (;sd != NULL; sd = sd->sender()) {
2733 st->move_to(column);
2734 st->print("; -");
2735 if (sd->method().is_null()) {
2736 st->print("method is NULL");
2737 } else {
2738 sd->method()->print_short_name(st);
2739 }
2740 int lineno = sd->method()->line_number_from_bci(sd->bci());
2741 if (lineno != -1) {
2742 st->print("@%d (line %d)", sd->bci(), lineno);
2743 } else {
2744 st->print("@%d", sd->bci());
2745 }
2746 st->cr();
2747 }
2748 }
2749
2750 // Print relocation information
2751 const char* str = reloc_string_for(begin, end);
2752 if (str != NULL) {
2753 if (sd != NULL) st->cr();
2754 st->move_to(column);
2755 st->print("; {%s}", str);
2756 }
2757 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin());
2758 if (cont_offset != 0) {
2759 st->move_to(column);
2760 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, code_begin() + cont_offset);
2761 }
2762
2763 }
2764
2765 #ifndef PRODUCT
2766
2767 void nmethod::print_value_on(outputStream* st) const {
2768 print_on(st, "nmethod");
2769 }
2770
2771 void nmethod::print_calls(outputStream* st) {
2772 RelocIterator iter(this);
2773 while (iter.next()) {
2774 switch (iter.type()) {
2775 case relocInfo::virtual_call_type:
2776 case relocInfo::opt_virtual_call_type: {
2777 VerifyMutexLocker mc(CompiledIC_lock);
2778 CompiledIC_at(iter.reloc())->print();
2779 break;
2780 }
2781 case relocInfo::static_call_type:
2782 st->print_cr("Static call at " INTPTR_FORMAT, iter.reloc()->addr());
2783 compiledStaticCall_at(iter.reloc())->print();
2784 break;
2785 }
2786 }
2787 }
2788
2789 void nmethod::print_handler_table() {
2790 ExceptionHandlerTable(this).print();
2791 }
2792
2793 void nmethod::print_nul_chk_table() {
2794 ImplicitExceptionTable(this).print(code_begin());
2795 }
2796
2797 void nmethod::print_statistics() {
2798 ttyLocker ttyl;
2799 if (xtty != NULL) xtty->head("statistics type='nmethod'");
2800 nmethod_stats.print_native_nmethod_stats();
2801 nmethod_stats.print_nmethod_stats();
2802 DebugInformationRecorder::print_statistics();
2803 nmethod_stats.print_pc_stats();
2804 Dependencies::print_statistics();
2805 if (xtty != NULL) xtty->tail("statistics");
2806 }
2807
2808 #endif // PRODUCT