1 /*
2 * Copyright (c) 1997, 2011, 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 "prims/jvmtiImpl.hpp"
38 #include "runtime/sharedRuntime.hpp"
39 #include "runtime/sweeper.hpp"
40 #include "utilities/dtrace.hpp"
41 #include "utilities/events.hpp"
42 #include "utilities/xmlstream.hpp"
43 #ifdef SHARK
44 #include "shark/sharkCompiler.hpp"
45 #endif
46
47 #ifdef DTRACE_ENABLED
48
49 // Only bother with this argument setup if dtrace is available
50
51 HS_DTRACE_PROBE_DECL8(hotspot, compiled__method__load,
52 const char*, int, const char*, int, const char*, int, void*, size_t);
53
54 HS_DTRACE_PROBE_DECL6(hotspot, compiled__method__unload,
55 char*, int, char*, int, char*, int);
56
57 #define DTRACE_METHOD_UNLOAD_PROBE(method) \
58 { \
59 methodOop m = (method); \
60 if (m != NULL) { \
61 Symbol* klass_name = m->klass_name(); \
62 Symbol* name = m->name(); \
63 Symbol* signature = m->signature(); \
64 HS_DTRACE_PROBE6(hotspot, compiled__method__unload, \
65 klass_name->bytes(), klass_name->utf8_length(), \
66 name->bytes(), name->utf8_length(), \
67 signature->bytes(), signature->utf8_length()); \
68 } \
69 }
70
71 #else // ndef DTRACE_ENABLED
72
73 #define DTRACE_METHOD_UNLOAD_PROBE(method)
74
75 #endif
76
77 bool nmethod::is_compiled_by_c1() const {
78 if (compiler() == NULL || method() == NULL) return false; // can happen during debug printing
79 if (is_native_method()) return false;
80 return compiler()->is_c1();
81 }
82 bool nmethod::is_compiled_by_c2() const {
83 if (compiler() == NULL || method() == NULL) return false; // can happen during debug printing
84 if (is_native_method()) return false;
85 return compiler()->is_c2();
86 }
87 bool nmethod::is_compiled_by_shark() const {
88 if (is_native_method()) return false;
89 assert(compiler() != NULL, "must be");
90 return compiler()->is_shark();
91 }
92
93
94
95 //---------------------------------------------------------------------------------
96 // NMethod statistics
97 // They are printed under various flags, including:
98 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation.
99 // (In the latter two cases, they like other stats are printed to the log only.)
100
101 #ifndef PRODUCT
102 // These variables are put into one block to reduce relocations
103 // and make it simpler to print from the debugger.
104 static
105 struct nmethod_stats_struct {
106 int nmethod_count;
107 int total_size;
108 int relocation_size;
109 int consts_size;
110 int insts_size;
111 int stub_size;
112 int scopes_data_size;
113 int scopes_pcs_size;
114 int dependencies_size;
115 int handler_table_size;
116 int nul_chk_table_size;
117 int oops_size;
118
119 void note_nmethod(nmethod* nm) {
120 nmethod_count += 1;
121 total_size += nm->size();
122 relocation_size += nm->relocation_size();
123 consts_size += nm->consts_size();
124 insts_size += nm->insts_size();
125 stub_size += nm->stub_size();
126 oops_size += nm->oops_size();
127 scopes_data_size += nm->scopes_data_size();
128 scopes_pcs_size += nm->scopes_pcs_size();
129 dependencies_size += nm->dependencies_size();
130 handler_table_size += nm->handler_table_size();
131 nul_chk_table_size += nm->nul_chk_table_size();
132 }
133 void print_nmethod_stats() {
134 if (nmethod_count == 0) return;
135 tty->print_cr("Statistics for %d bytecoded nmethods:", nmethod_count);
136 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size);
137 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size);
138 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size);
139 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size);
140 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size);
141 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size);
142 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size);
143 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size);
144 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size);
145 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size);
146 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size);
147 }
148
149 int native_nmethod_count;
150 int native_total_size;
151 int native_relocation_size;
152 int native_insts_size;
153 int native_oops_size;
154 void note_native_nmethod(nmethod* nm) {
155 native_nmethod_count += 1;
156 native_total_size += nm->size();
157 native_relocation_size += nm->relocation_size();
158 native_insts_size += nm->insts_size();
159 native_oops_size += nm->oops_size();
160 }
161 void print_native_nmethod_stats() {
162 if (native_nmethod_count == 0) return;
163 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count);
164 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size);
165 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size);
166 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size);
167 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size);
168 }
169
170 int pc_desc_resets; // number of resets (= number of caches)
171 int pc_desc_queries; // queries to nmethod::find_pc_desc
172 int pc_desc_approx; // number of those which have approximate true
173 int pc_desc_repeats; // number of _last_pc_desc hits
174 int pc_desc_hits; // number of LRU cache hits
175 int pc_desc_tests; // total number of PcDesc examinations
176 int pc_desc_searches; // total number of quasi-binary search steps
177 int pc_desc_adds; // number of LUR cache insertions
178
179 void print_pc_stats() {
180 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query",
181 pc_desc_queries,
182 (double)(pc_desc_tests + pc_desc_searches)
183 / pc_desc_queries);
184 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d",
185 pc_desc_resets,
186 pc_desc_queries, pc_desc_approx,
187 pc_desc_repeats, pc_desc_hits,
188 pc_desc_tests, pc_desc_searches, pc_desc_adds);
189 }
190 } nmethod_stats;
191 #endif //PRODUCT
192
193
194 //---------------------------------------------------------------------------------
195
196
197 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) {
198 assert(pc != NULL, "Must be non null");
199 assert(exception.not_null(), "Must be non null");
200 assert(handler != NULL, "Must be non null");
201
202 _count = 0;
203 _exception_type = exception->klass();
204 _next = NULL;
205
206 add_address_and_handler(pc,handler);
207 }
208
209
210 address ExceptionCache::match(Handle exception, address pc) {
211 assert(pc != NULL,"Must be non null");
212 assert(exception.not_null(),"Must be non null");
213 if (exception->klass() == exception_type()) {
214 return (test_address(pc));
215 }
216
217 return NULL;
218 }
219
220
221 bool ExceptionCache::match_exception_with_space(Handle exception) {
222 assert(exception.not_null(),"Must be non null");
223 if (exception->klass() == exception_type() && count() < cache_size) {
224 return true;
225 }
226 return false;
227 }
228
229
230 address ExceptionCache::test_address(address addr) {
231 for (int i=0; i<count(); i++) {
232 if (pc_at(i) == addr) {
233 return handler_at(i);
234 }
235 }
236 return NULL;
237 }
238
239
240 bool ExceptionCache::add_address_and_handler(address addr, address handler) {
241 if (test_address(addr) == handler) return true;
242 if (count() < cache_size) {
243 set_pc_at(count(),addr);
244 set_handler_at(count(), handler);
245 increment_count();
246 return true;
247 }
248 return false;
249 }
250
251
252 // private method for handling exception cache
253 // These methods are private, and used to manipulate the exception cache
254 // directly.
255 ExceptionCache* nmethod::exception_cache_entry_for_exception(Handle exception) {
256 ExceptionCache* ec = exception_cache();
257 while (ec != NULL) {
258 if (ec->match_exception_with_space(exception)) {
259 return ec;
260 }
261 ec = ec->next();
262 }
263 return NULL;
264 }
265
266
267 //-----------------------------------------------------------------------------
268
269
270 // Helper used by both find_pc_desc methods.
271 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) {
272 NOT_PRODUCT(++nmethod_stats.pc_desc_tests);
273 if (!approximate)
274 return pc->pc_offset() == pc_offset;
275 else
276 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset();
277 }
278
279 void PcDescCache::reset_to(PcDesc* initial_pc_desc) {
280 if (initial_pc_desc == NULL) {
281 _last_pc_desc = NULL; // native method
282 return;
283 }
284 NOT_PRODUCT(++nmethod_stats.pc_desc_resets);
285 // reset the cache by filling it with benign (non-null) values
286 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel");
287 _last_pc_desc = initial_pc_desc + 1; // first valid one is after sentinel
288 for (int i = 0; i < cache_size; i++)
289 _pc_descs[i] = initial_pc_desc;
290 }
291
292 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) {
293 NOT_PRODUCT(++nmethod_stats.pc_desc_queries);
294 NOT_PRODUCT(if (approximate) ++nmethod_stats.pc_desc_approx);
295
296 // In order to prevent race conditions do not load cache elements
297 // repeatedly, but use a local copy:
298 PcDesc* res;
299
300 // Step one: Check the most recently returned value.
301 res = _last_pc_desc;
302 if (res == NULL) return NULL; // native method; no PcDescs at all
303 if (match_desc(res, pc_offset, approximate)) {
304 NOT_PRODUCT(++nmethod_stats.pc_desc_repeats);
305 return res;
306 }
307
308 // Step two: Check the LRU cache.
309 for (int i = 0; i < cache_size; i++) {
310 res = _pc_descs[i];
311 if (res->pc_offset() < 0) break; // optimization: skip empty cache
312 if (match_desc(res, pc_offset, approximate)) {
313 NOT_PRODUCT(++nmethod_stats.pc_desc_hits);
314 _last_pc_desc = res; // record this cache hit in case of repeat
315 return res;
316 }
317 }
318
319 // Report failure.
320 return NULL;
321 }
322
323 void PcDescCache::add_pc_desc(PcDesc* pc_desc) {
324 NOT_PRODUCT(++nmethod_stats.pc_desc_adds);
325 // Update the LRU cache by shifting pc_desc forward:
326 for (int i = 0; i < cache_size; i++) {
327 PcDesc* next = _pc_descs[i];
328 _pc_descs[i] = pc_desc;
329 pc_desc = next;
330 }
331 // Note: Do not update _last_pc_desc. It fronts for the LRU cache.
332 }
333
334 // adjust pcs_size so that it is a multiple of both oopSize and
335 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple
336 // of oopSize, then 2*sizeof(PcDesc) is)
337 static int adjust_pcs_size(int pcs_size) {
338 int nsize = round_to(pcs_size, oopSize);
339 if ((nsize % sizeof(PcDesc)) != 0) {
340 nsize = pcs_size + sizeof(PcDesc);
341 }
342 assert((nsize % oopSize) == 0, "correct alignment");
343 return nsize;
344 }
345
346 //-----------------------------------------------------------------------------
347
348
349 void nmethod::add_exception_cache_entry(ExceptionCache* new_entry) {
350 assert(ExceptionCache_lock->owned_by_self(),"Must hold the ExceptionCache_lock");
351 assert(new_entry != NULL,"Must be non null");
352 assert(new_entry->next() == NULL, "Must be null");
353
354 if (exception_cache() != NULL) {
355 new_entry->set_next(exception_cache());
356 }
357 set_exception_cache(new_entry);
358 }
359
360 void nmethod::remove_from_exception_cache(ExceptionCache* ec) {
361 ExceptionCache* prev = NULL;
362 ExceptionCache* curr = exception_cache();
363 assert(curr != NULL, "nothing to remove");
364 // find the previous and next entry of ec
365 while (curr != ec) {
366 prev = curr;
367 curr = curr->next();
368 assert(curr != NULL, "ExceptionCache not found");
369 }
370 // now: curr == ec
371 ExceptionCache* next = curr->next();
372 if (prev == NULL) {
373 set_exception_cache(next);
374 } else {
375 prev->set_next(next);
376 }
377 delete curr;
378 }
379
380
381 // public method for accessing the exception cache
382 // These are the public access methods.
383 address nmethod::handler_for_exception_and_pc(Handle exception, address pc) {
384 // We never grab a lock to read the exception cache, so we may
385 // have false negatives. This is okay, as it can only happen during
386 // the first few exception lookups for a given nmethod.
387 ExceptionCache* ec = exception_cache();
388 while (ec != NULL) {
389 address ret_val;
390 if ((ret_val = ec->match(exception,pc)) != NULL) {
391 return ret_val;
392 }
393 ec = ec->next();
394 }
395 return NULL;
396 }
397
398
399 void nmethod::add_handler_for_exception_and_pc(Handle exception, address pc, address handler) {
400 // There are potential race conditions during exception cache updates, so we
401 // must own the ExceptionCache_lock before doing ANY modifications. Because
402 // we don't lock during reads, it is possible to have several threads attempt
403 // to update the cache with the same data. We need to check for already inserted
404 // copies of the current data before adding it.
405
406 MutexLocker ml(ExceptionCache_lock);
407 ExceptionCache* target_entry = exception_cache_entry_for_exception(exception);
408
409 if (target_entry == NULL || !target_entry->add_address_and_handler(pc,handler)) {
410 target_entry = new ExceptionCache(exception,pc,handler);
411 add_exception_cache_entry(target_entry);
412 }
413 }
414
415
416 //-------------end of code for ExceptionCache--------------
417
418
419 int nmethod::total_size() const {
420 return
421 consts_size() +
422 insts_size() +
423 stub_size() +
424 scopes_data_size() +
425 scopes_pcs_size() +
426 handler_table_size() +
427 nul_chk_table_size();
428 }
429
430 const char* nmethod::compile_kind() const {
431 if (is_osr_method()) return "osr";
432 if (method() != NULL && is_native_method()) return "c2n";
433 return NULL;
434 }
435
436 // Fill in default values for various flag fields
437 void nmethod::init_defaults() {
438 _state = alive;
439 _marked_for_reclamation = 0;
440 _has_flushed_dependencies = 0;
441 _speculatively_disconnected = 0;
442 _has_unsafe_access = 0;
443 _has_method_handle_invokes = 0;
444 _marked_for_deoptimization = 0;
445 _lock_count = 0;
446 _stack_traversal_mark = 0;
447 _unload_reported = false; // jvmti state
448
449 NOT_PRODUCT(_has_debug_info = false);
450 #ifdef ASSERT
451 _oops_are_stale = false;
452 #endif
453
454 _oops_do_mark_link = NULL;
455 _jmethod_id = NULL;
456 _osr_link = NULL;
457 _scavenge_root_link = NULL;
458 _scavenge_root_state = 0;
459 _saved_nmethod_link = NULL;
460 _compiler = NULL;
461
462 #ifdef HAVE_DTRACE_H
463 _trap_offset = 0;
464 #endif // def HAVE_DTRACE_H
465 }
466
467
468 nmethod* nmethod::new_native_nmethod(methodHandle method,
469 CodeBuffer *code_buffer,
470 int vep_offset,
471 int frame_complete,
472 int frame_size,
473 ByteSize basic_lock_owner_sp_offset,
474 ByteSize basic_lock_sp_offset,
475 OopMapSet* oop_maps) {
476 // create nmethod
477 nmethod* nm = NULL;
478 {
479 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
480 int native_nmethod_size = allocation_size(code_buffer, sizeof(nmethod));
481 CodeOffsets offsets;
482 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
483 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
484 nm = new (native_nmethod_size)
485 nmethod(method(), native_nmethod_size, &offsets,
486 code_buffer, frame_size,
487 basic_lock_owner_sp_offset, basic_lock_sp_offset,
488 oop_maps);
489 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_native_nmethod(nm));
490 if (PrintAssembly && nm != NULL)
491 Disassembler::decode(nm);
492 }
493 // verify nmethod
494 debug_only(if (nm) nm->verify();) // might block
495
496 if (nm != NULL) {
497 nm->log_new_nmethod();
498 }
499
500 return nm;
501 }
502
503 #ifdef HAVE_DTRACE_H
504 nmethod* nmethod::new_dtrace_nmethod(methodHandle method,
505 CodeBuffer *code_buffer,
506 int vep_offset,
507 int trap_offset,
508 int frame_complete,
509 int frame_size) {
510 // create nmethod
511 nmethod* nm = NULL;
512 {
513 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
514 int nmethod_size = allocation_size(code_buffer, sizeof(nmethod));
515 CodeOffsets offsets;
516 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
517 offsets.set_value(CodeOffsets::Dtrace_trap, trap_offset);
518 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
519
520 nm = new (nmethod_size) nmethod(method(), nmethod_size, &offsets, code_buffer, frame_size);
521
522 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_nmethod(nm));
523 if (PrintAssembly && nm != NULL)
524 Disassembler::decode(nm);
525 }
526 // verify nmethod
527 debug_only(if (nm) nm->verify();) // might block
528
529 if (nm != NULL) {
530 nm->log_new_nmethod();
531 }
532
533 return nm;
534 }
535
536 #endif // def HAVE_DTRACE_H
537
538 nmethod* nmethod::new_nmethod(methodHandle method,
539 int compile_id,
540 int entry_bci,
541 CodeOffsets* offsets,
542 int orig_pc_offset,
543 DebugInformationRecorder* debug_info,
544 Dependencies* dependencies,
545 CodeBuffer* code_buffer, int frame_size,
546 OopMapSet* oop_maps,
547 ExceptionHandlerTable* handler_table,
548 ImplicitExceptionTable* nul_chk_table,
549 AbstractCompiler* compiler,
550 int comp_level
551 )
552 {
553 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
554 // create nmethod
555 nmethod* nm = NULL;
556 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
557 int nmethod_size =
558 allocation_size(code_buffer, sizeof(nmethod))
559 + adjust_pcs_size(debug_info->pcs_size())
560 + round_to(dependencies->size_in_bytes() , oopSize)
561 + round_to(handler_table->size_in_bytes(), oopSize)
562 + round_to(nul_chk_table->size_in_bytes(), oopSize)
563 + round_to(debug_info->data_size() , oopSize);
564 nm = new (nmethod_size)
565 nmethod(method(), nmethod_size, compile_id, entry_bci, offsets,
566 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size,
567 oop_maps,
568 handler_table,
569 nul_chk_table,
570 compiler,
571 comp_level);
572 if (nm != NULL) {
573 // To make dependency checking during class loading fast, record
574 // the nmethod dependencies in the classes it is dependent on.
575 // This allows the dependency checking code to simply walk the
576 // class hierarchy above the loaded class, checking only nmethods
577 // which are dependent on those classes. The slow way is to
578 // check every nmethod for dependencies which makes it linear in
579 // the number of methods compiled. For applications with a lot
580 // classes the slow way is too slow.
581 for (Dependencies::DepStream deps(nm); deps.next(); ) {
582 klassOop klass = deps.context_type();
583 if (klass == NULL) continue; // ignore things like evol_method
584
585 // record this nmethod as dependent on this klass
586 instanceKlass::cast(klass)->add_dependent_nmethod(nm);
587 }
588 }
589 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_nmethod(nm));
590 if (PrintAssembly && nm != NULL)
591 Disassembler::decode(nm);
592 }
593
594 // verify nmethod
595 debug_only(if (nm) nm->verify();) // might block
596
597 if (nm != NULL) {
598 nm->log_new_nmethod();
599 }
600
601 // done
602 return nm;
603 }
604
605
606 // For native wrappers
607 nmethod::nmethod(
608 methodOop method,
609 int nmethod_size,
610 CodeOffsets* offsets,
611 CodeBuffer* code_buffer,
612 int frame_size,
613 ByteSize basic_lock_owner_sp_offset,
614 ByteSize basic_lock_sp_offset,
615 OopMapSet* oop_maps )
616 : CodeBlob("native nmethod", code_buffer, sizeof(nmethod),
617 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps),
618 _native_receiver_sp_offset(basic_lock_owner_sp_offset),
619 _native_basic_lock_sp_offset(basic_lock_sp_offset)
620 {
621 {
622 debug_only(No_Safepoint_Verifier nsv;)
623 assert_locked_or_safepoint(CodeCache_lock);
624
625 init_defaults();
626 _method = method;
627 _entry_bci = InvocationEntryBci;
628 // We have no exception handler or deopt handler make the
629 // values something that will never match a pc like the nmethod vtable entry
630 _exception_offset = 0;
631 _deoptimize_offset = 0;
632 _deoptimize_mh_offset = 0;
633 _orig_pc_offset = 0;
634
635 _consts_offset = data_offset();
636 _stub_offset = data_offset();
637 _oops_offset = data_offset();
638 _scopes_data_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize);
639 _scopes_pcs_offset = _scopes_data_offset;
640 _dependencies_offset = _scopes_pcs_offset;
641 _handler_table_offset = _dependencies_offset;
642 _nul_chk_table_offset = _handler_table_offset;
643 _nmethod_end_offset = _nul_chk_table_offset;
644 _compile_id = 0; // default
645 _comp_level = CompLevel_none;
646 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
647 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
648 _osr_entry_point = NULL;
649 _exception_cache = NULL;
650 _pc_desc_cache.reset_to(NULL);
651
652 code_buffer->copy_oops_to(this);
653 debug_only(verify_scavenge_root_oops());
654 CodeCache::commit(this);
655 }
656
657 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
658 ttyLocker ttyl; // keep the following output all in one block
659 // This output goes directly to the tty, not the compiler log.
660 // To enable tools to match it up with the compilation activity,
661 // be sure to tag this tty output with the compile ID.
662 if (xtty != NULL) {
663 xtty->begin_head("print_native_nmethod");
664 xtty->method(_method);
665 xtty->stamp();
666 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
667 }
668 // print the header part first
669 print();
670 // then print the requested information
671 if (PrintNativeNMethods) {
672 print_code();
673 oop_maps->print();
674 }
675 if (PrintRelocations) {
676 print_relocations();
677 }
678 if (xtty != NULL) {
679 xtty->tail("print_native_nmethod");
680 }
681 }
682 Events::log("Create nmethod " INTPTR_FORMAT, this);
683 }
684
685 // For dtrace wrappers
686 #ifdef HAVE_DTRACE_H
687 nmethod::nmethod(
688 methodOop method,
689 int nmethod_size,
690 CodeOffsets* offsets,
691 CodeBuffer* code_buffer,
692 int frame_size)
693 : CodeBlob("dtrace nmethod", code_buffer, sizeof(nmethod),
694 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, NULL),
695 _native_receiver_sp_offset(in_ByteSize(-1)),
696 _native_basic_lock_sp_offset(in_ByteSize(-1))
697 {
698 {
699 debug_only(No_Safepoint_Verifier nsv;)
700 assert_locked_or_safepoint(CodeCache_lock);
701
702 init_defaults();
703 _method = method;
704 _entry_bci = InvocationEntryBci;
705 // We have no exception handler or deopt handler make the
706 // values something that will never match a pc like the nmethod vtable entry
707 _exception_offset = 0;
708 _deoptimize_offset = 0;
709 _deoptimize_mh_offset = 0;
710 _unwind_handler_offset = -1;
711 _trap_offset = offsets->value(CodeOffsets::Dtrace_trap);
712 _orig_pc_offset = 0;
713 _consts_offset = data_offset();
714 _stub_offset = data_offset();
715 _oops_offset = data_offset();
716 _scopes_data_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize);
717 _scopes_pcs_offset = _scopes_data_offset;
718 _dependencies_offset = _scopes_pcs_offset;
719 _handler_table_offset = _dependencies_offset;
720 _nul_chk_table_offset = _handler_table_offset;
721 _nmethod_end_offset = _nul_chk_table_offset;
722 _compile_id = 0; // default
723 _comp_level = CompLevel_none;
724 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
725 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
726 _osr_entry_point = NULL;
727 _exception_cache = NULL;
728 _pc_desc_cache.reset_to(NULL);
729
730 code_buffer->copy_oops_to(this);
731 debug_only(verify_scavenge_root_oops());
732 CodeCache::commit(this);
733 }
734
735 if (PrintNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
736 ttyLocker ttyl; // keep the following output all in one block
737 // This output goes directly to the tty, not the compiler log.
738 // To enable tools to match it up with the compilation activity,
739 // be sure to tag this tty output with the compile ID.
740 if (xtty != NULL) {
741 xtty->begin_head("print_dtrace_nmethod");
742 xtty->method(_method);
743 xtty->stamp();
744 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
745 }
746 // print the header part first
747 print();
748 // then print the requested information
749 if (PrintNMethods) {
750 print_code();
751 }
752 if (PrintRelocations) {
753 print_relocations();
754 }
755 if (xtty != NULL) {
756 xtty->tail("print_dtrace_nmethod");
757 }
758 }
759 Events::log("Create nmethod " INTPTR_FORMAT, this);
760 }
761 #endif // def HAVE_DTRACE_H
762
763 void* nmethod::operator new(size_t size, int nmethod_size) {
764 // Always leave some room in the CodeCache for I2C/C2I adapters
765 if (CodeCache::unallocated_capacity() < CodeCacheMinimumFreeSpace) return NULL;
766 return CodeCache::allocate(nmethod_size);
767 }
768
769
770 nmethod::nmethod(
771 methodOop method,
772 int nmethod_size,
773 int compile_id,
774 int entry_bci,
775 CodeOffsets* offsets,
776 int orig_pc_offset,
777 DebugInformationRecorder* debug_info,
778 Dependencies* dependencies,
779 CodeBuffer *code_buffer,
780 int frame_size,
781 OopMapSet* oop_maps,
782 ExceptionHandlerTable* handler_table,
783 ImplicitExceptionTable* nul_chk_table,
784 AbstractCompiler* compiler,
785 int comp_level
786 )
787 : CodeBlob("nmethod", code_buffer, sizeof(nmethod),
788 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps),
789 _native_receiver_sp_offset(in_ByteSize(-1)),
790 _native_basic_lock_sp_offset(in_ByteSize(-1))
791 {
792 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
793 {
794 debug_only(No_Safepoint_Verifier nsv;)
795 assert_locked_or_safepoint(CodeCache_lock);
796
797 init_defaults();
798 _method = method;
799 _entry_bci = entry_bci;
800 _compile_id = compile_id;
801 _comp_level = comp_level;
802 _compiler = compiler;
803 _orig_pc_offset = orig_pc_offset;
804
805 // Section offsets
806 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts());
807 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs());
808
809 // Exception handler and deopt handler are in the stub section
810 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set");
811 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set");
812 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
813 _deoptimize_offset = _stub_offset + offsets->value(CodeOffsets::Deopt);
814 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
815 _deoptimize_mh_offset = _stub_offset + offsets->value(CodeOffsets::DeoptMH);
816 } else {
817 _deoptimize_mh_offset = -1;
818 }
819 if (offsets->value(CodeOffsets::UnwindHandler) != -1) {
820 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler);
821 } else {
822 _unwind_handler_offset = -1;
823 }
824
825 _oops_offset = data_offset();
826 _scopes_data_offset = _oops_offset + round_to(code_buffer->total_oop_size (), oopSize);
827 _scopes_pcs_offset = _scopes_data_offset + round_to(debug_info->data_size (), oopSize);
828 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
829 _handler_table_offset = _dependencies_offset + round_to(dependencies->size_in_bytes (), oopSize);
830 _nul_chk_table_offset = _handler_table_offset + round_to(handler_table->size_in_bytes(), oopSize);
831 _nmethod_end_offset = _nul_chk_table_offset + round_to(nul_chk_table->size_in_bytes(), oopSize);
832
833 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
834 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
835 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry);
836 _exception_cache = NULL;
837 _pc_desc_cache.reset_to(scopes_pcs_begin());
838
839 // Copy contents of ScopeDescRecorder to nmethod
840 code_buffer->copy_oops_to(this);
841 debug_info->copy_to(this);
842 dependencies->copy_to(this);
843 if (ScavengeRootsInCode && detect_scavenge_root_oops()) {
844 CodeCache::add_scavenge_root_nmethod(this);
845 }
846 debug_only(verify_scavenge_root_oops());
847
848 CodeCache::commit(this);
849
850 // Copy contents of ExceptionHandlerTable to nmethod
851 handler_table->copy_to(this);
852 nul_chk_table->copy_to(this);
853
854 // we use the information of entry points to find out if a method is
855 // static or non static
856 assert(compiler->is_c2() ||
857 _method->is_static() == (entry_point() == _verified_entry_point),
858 " entry points must be same for static methods and vice versa");
859 }
860
861 bool printnmethods = PrintNMethods
862 || CompilerOracle::should_print(_method)
863 || CompilerOracle::has_option_string(_method, "PrintNMethods");
864 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
865 print_nmethod(printnmethods);
866 }
867
868 // Note: Do not verify in here as the CodeCache_lock is
869 // taken which would conflict with the CompiledIC_lock
870 // which taken during the verification of call sites.
871 // (was bug - gri 10/25/99)
872
873 Events::log("Create nmethod " INTPTR_FORMAT, this);
874 }
875
876
877 // Print a short set of xml attributes to identify this nmethod. The
878 // output should be embedded in some other element.
879 void nmethod::log_identity(xmlStream* log) const {
880 log->print(" compile_id='%d'", compile_id());
881 const char* nm_kind = compile_kind();
882 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind);
883 if (compiler() != NULL) {
884 log->print(" compiler='%s'", compiler()->name());
885 }
886 if (TieredCompilation) {
887 log->print(" level='%d'", comp_level());
888 }
889 }
890
891
892 #define LOG_OFFSET(log, name) \
893 if ((intptr_t)name##_end() - (intptr_t)name##_begin()) \
894 log->print(" " XSTR(name) "_offset='%d'" , \
895 (intptr_t)name##_begin() - (intptr_t)this)
896
897
898 void nmethod::log_new_nmethod() const {
899 if (LogCompilation && xtty != NULL) {
900 ttyLocker ttyl;
901 HandleMark hm;
902 xtty->begin_elem("nmethod");
903 log_identity(xtty);
904 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", code_begin(), size());
905 xtty->print(" address='" INTPTR_FORMAT "'", (intptr_t) this);
906
907 LOG_OFFSET(xtty, relocation);
908 LOG_OFFSET(xtty, consts);
909 LOG_OFFSET(xtty, insts);
910 LOG_OFFSET(xtty, stub);
911 LOG_OFFSET(xtty, scopes_data);
912 LOG_OFFSET(xtty, scopes_pcs);
913 LOG_OFFSET(xtty, dependencies);
914 LOG_OFFSET(xtty, handler_table);
915 LOG_OFFSET(xtty, nul_chk_table);
916 LOG_OFFSET(xtty, oops);
917
918 xtty->method(method());
919 xtty->stamp();
920 xtty->end_elem();
921 }
922 }
923
924 #undef LOG_OFFSET
925
926
927 void nmethod::print_compilation(outputStream *st, const char *method_name, const char *title,
928 methodOop method, bool is_blocking, int compile_id, int bci, int comp_level) {
929 bool is_synchronized = false, has_xhandler = false, is_native = false;
930 int code_size = -1;
931 if (method != NULL) {
932 is_synchronized = method->is_synchronized();
933 has_xhandler = method->has_exception_handler();
934 is_native = method->is_native();
935 code_size = method->code_size();
936 }
937 // print compilation number
938 st->print("%7d %3d", (int)tty->time_stamp().milliseconds(), compile_id);
939
940 // print method attributes
941 const bool is_osr = bci != InvocationEntryBci;
942 const char blocking_char = is_blocking ? 'b' : ' ';
943 const char compile_type = is_osr ? '%' : ' ';
944 const char sync_char = is_synchronized ? 's' : ' ';
945 const char exception_char = has_xhandler ? '!' : ' ';
946 const char native_char = is_native ? 'n' : ' ';
947 st->print("%c%c%c%c%c ", compile_type, sync_char, exception_char, blocking_char, native_char);
948 if (TieredCompilation) {
949 st->print("%d ", comp_level);
950 }
951
952 // print optional title
953 bool do_nl = false;
954 if (title != NULL) {
955 int tlen = (int) strlen(title);
956 bool do_nl = false;
957 if (tlen > 0 && title[tlen-1] == '\n') { tlen--; do_nl = true; }
958 st->print("%.*s", tlen, title);
959 } else {
960 do_nl = true;
961 }
962
963 // print method name string if given
964 if (method_name != NULL) {
965 st->print(method_name);
966 } else {
967 // otherwise as the method to print itself
968 if (method != NULL && !Universe::heap()->is_gc_active()) {
969 method->print_short_name(st);
970 } else {
971 st->print("(method)");
972 }
973 }
974
975 if (method != NULL) {
976 // print osr_bci if any
977 if (is_osr) st->print(" @ %d", bci);
978 // print method size
979 st->print(" (%d bytes)", code_size);
980 }
981 if (do_nl) st->cr();
982 }
983
984 // Print out more verbose output usually for a newly created nmethod.
985 void nmethod::print_on(outputStream* st, const char* title) const {
986 if (st != NULL) {
987 ttyLocker ttyl;
988 print_compilation(st, /*method_name*/NULL, title,
989 method(), /*is_blocking*/false,
990 compile_id(),
991 is_osr_method() ? osr_entry_bci() : InvocationEntryBci,
992 comp_level());
993 if (WizardMode) st->print(" (" INTPTR_FORMAT ")", this);
994 }
995 }
996
997
998 void nmethod::print_nmethod(bool printmethod) {
999 ttyLocker ttyl; // keep the following output all in one block
1000 if (xtty != NULL) {
1001 xtty->begin_head("print_nmethod");
1002 xtty->stamp();
1003 xtty->end_head();
1004 }
1005 // print the header part first
1006 print();
1007 // then print the requested information
1008 if (printmethod) {
1009 print_code();
1010 print_pcs();
1011 oop_maps()->print();
1012 }
1013 if (PrintDebugInfo) {
1014 print_scopes();
1015 }
1016 if (PrintRelocations) {
1017 print_relocations();
1018 }
1019 if (PrintDependencies) {
1020 print_dependencies();
1021 }
1022 if (PrintExceptionHandlers) {
1023 print_handler_table();
1024 print_nul_chk_table();
1025 }
1026 if (xtty != NULL) {
1027 xtty->tail("print_nmethod");
1028 }
1029 }
1030
1031
1032 // Promote one word from an assembly-time handle to a live embedded oop.
1033 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
1034 if (handle == NULL ||
1035 // As a special case, IC oops are initialized to 1 or -1.
1036 handle == (jobject) Universe::non_oop_word()) {
1037 (*dest) = (oop) handle;
1038 } else {
1039 (*dest) = JNIHandles::resolve_non_null(handle);
1040 }
1041 }
1042
1043
1044 void nmethod::copy_oops(GrowableArray<jobject>* array) {
1045 //assert(oops_size() == 0, "do this handshake just once, please");
1046 int length = array->length();
1047 assert((address)(oops_begin() + length) <= data_end(), "oops big enough");
1048 oop* dest = oops_begin();
1049 for (int index = 0 ; index < length; index++) {
1050 initialize_immediate_oop(&dest[index], array->at(index));
1051 }
1052
1053 // Now we can fix up all the oops in the code. We need to do this
1054 // in the code because the assembler uses jobjects as placeholders.
1055 // The code and relocations have already been initialized by the
1056 // CodeBlob constructor, so it is valid even at this early point to
1057 // iterate over relocations and patch the code.
1058 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true);
1059 }
1060
1061
1062 bool nmethod::is_at_poll_return(address pc) {
1063 RelocIterator iter(this, pc, pc+1);
1064 while (iter.next()) {
1065 if (iter.type() == relocInfo::poll_return_type)
1066 return true;
1067 }
1068 return false;
1069 }
1070
1071
1072 bool nmethod::is_at_poll_or_poll_return(address pc) {
1073 RelocIterator iter(this, pc, pc+1);
1074 while (iter.next()) {
1075 relocInfo::relocType t = iter.type();
1076 if (t == relocInfo::poll_return_type || t == relocInfo::poll_type)
1077 return true;
1078 }
1079 return false;
1080 }
1081
1082
1083 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) {
1084 // re-patch all oop-bearing instructions, just in case some oops moved
1085 RelocIterator iter(this, begin, end);
1086 while (iter.next()) {
1087 if (iter.type() == relocInfo::oop_type) {
1088 oop_Relocation* reloc = iter.oop_reloc();
1089 if (initialize_immediates && reloc->oop_is_immediate()) {
1090 oop* dest = reloc->oop_addr();
1091 initialize_immediate_oop(dest, (jobject) *dest);
1092 }
1093 // Refresh the oop-related bits of this instruction.
1094 reloc->fix_oop_relocation();
1095 }
1096
1097 // There must not be any interfering patches or breakpoints.
1098 assert(!(iter.type() == relocInfo::breakpoint_type
1099 && iter.breakpoint_reloc()->active()),
1100 "no active breakpoint");
1101 }
1102 }
1103
1104
1105 void nmethod::verify_oop_relocations() {
1106 // Ensure sure that the code matches the current oop values
1107 RelocIterator iter(this, NULL, NULL);
1108 while (iter.next()) {
1109 if (iter.type() == relocInfo::oop_type) {
1110 oop_Relocation* reloc = iter.oop_reloc();
1111 if (!reloc->oop_is_immediate()) {
1112 reloc->verify_oop_relocation();
1113 }
1114 }
1115 }
1116 }
1117
1118
1119 ScopeDesc* nmethod::scope_desc_at(address pc) {
1120 PcDesc* pd = pc_desc_at(pc);
1121 guarantee(pd != NULL, "scope must be present");
1122 return new ScopeDesc(this, pd->scope_decode_offset(),
1123 pd->obj_decode_offset(), pd->should_reexecute(),
1124 pd->return_oop());
1125 }
1126
1127
1128 void nmethod::clear_inline_caches() {
1129 assert(SafepointSynchronize::is_at_safepoint(), "cleaning of IC's only allowed at safepoint");
1130 if (is_zombie()) {
1131 return;
1132 }
1133
1134 RelocIterator iter(this);
1135 while (iter.next()) {
1136 iter.reloc()->clear_inline_cache();
1137 }
1138 }
1139
1140
1141 void nmethod::cleanup_inline_caches() {
1142
1143 assert_locked_or_safepoint(CompiledIC_lock);
1144
1145 // If the method is not entrant or zombie then a JMP is plastered over the
1146 // first few bytes. If an oop in the old code was there, that oop
1147 // should not get GC'd. Skip the first few bytes of oops on
1148 // not-entrant methods.
1149 address low_boundary = verified_entry_point();
1150 if (!is_in_use()) {
1151 low_boundary += NativeJump::instruction_size;
1152 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1153 // This means that the low_boundary is going to be a little too high.
1154 // This shouldn't matter, since oops of non-entrant methods are never used.
1155 // In fact, why are we bothering to look at oops in a non-entrant method??
1156 }
1157
1158 // Find all calls in an nmethod, and clear the ones that points to zombie methods
1159 ResourceMark rm;
1160 RelocIterator iter(this, low_boundary);
1161 while(iter.next()) {
1162 switch(iter.type()) {
1163 case relocInfo::virtual_call_type:
1164 case relocInfo::opt_virtual_call_type: {
1165 CompiledIC *ic = CompiledIC_at(iter.reloc());
1166 // Ok, to lookup references to zombies here
1167 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
1168 if( cb != NULL && cb->is_nmethod() ) {
1169 nmethod* nm = (nmethod*)cb;
1170 // Clean inline caches pointing to both zombie and not_entrant methods
1171 if (!nm->is_in_use() || (nm->method()->code() != nm)) ic->set_to_clean();
1172 }
1173 break;
1174 }
1175 case relocInfo::static_call_type: {
1176 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
1177 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
1178 if( cb != NULL && cb->is_nmethod() ) {
1179 nmethod* nm = (nmethod*)cb;
1180 // Clean inline caches pointing to both zombie and not_entrant methods
1181 if (!nm->is_in_use() || (nm->method()->code() != nm)) csc->set_to_clean();
1182 }
1183 break;
1184 }
1185 }
1186 }
1187 }
1188
1189 // This is a private interface with the sweeper.
1190 void nmethod::mark_as_seen_on_stack() {
1191 assert(is_not_entrant(), "must be a non-entrant method");
1192 // Set the traversal mark to ensure that the sweeper does 2
1193 // cleaning passes before moving to zombie.
1194 set_stack_traversal_mark(NMethodSweeper::traversal_count());
1195 }
1196
1197 // Tell if a non-entrant method can be converted to a zombie (i.e., there is no activations on the stack)
1198 bool nmethod::can_not_entrant_be_converted() {
1199 assert(is_not_entrant(), "must be a non-entrant method");
1200
1201 // Since the nmethod sweeper only does partial sweep the sweeper's traversal
1202 // count can be greater than the stack traversal count before it hits the
1203 // nmethod for the second time.
1204 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count();
1205 }
1206
1207 void nmethod::inc_decompile_count() {
1208 if (!is_compiled_by_c2()) return;
1209 // Could be gated by ProfileTraps, but do not bother...
1210 methodOop m = method();
1211 if (m == NULL) return;
1212 methodDataOop mdo = m->method_data();
1213 if (mdo == NULL) return;
1214 // There is a benign race here. See comments in methodDataOop.hpp.
1215 mdo->inc_decompile_count();
1216 }
1217
1218 void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) {
1219
1220 post_compiled_method_unload();
1221
1222 // Since this nmethod is being unloaded, make sure that dependencies
1223 // recorded in instanceKlasses get flushed and pass non-NULL closure to
1224 // indicate that this work is being done during a GC.
1225 assert(Universe::heap()->is_gc_active(), "should only be called during gc");
1226 assert(is_alive != NULL, "Should be non-NULL");
1227 // A non-NULL is_alive closure indicates that this is being called during GC.
1228 flush_dependencies(is_alive);
1229
1230 // Break cycle between nmethod & method
1231 if (TraceClassUnloading && WizardMode) {
1232 tty->print_cr("[Class unloading: Making nmethod " INTPTR_FORMAT
1233 " unloadable], methodOop(" INTPTR_FORMAT
1234 "), cause(" INTPTR_FORMAT ")",
1235 this, (address)_method, (address)cause);
1236 if (!Universe::heap()->is_gc_active())
1237 cause->klass()->print();
1238 }
1239 // Unlink the osr method, so we do not look this up again
1240 if (is_osr_method()) {
1241 invalidate_osr_method();
1242 }
1243 // If _method is already NULL the methodOop is about to be unloaded,
1244 // so we don't have to break the cycle. Note that it is possible to
1245 // have the methodOop live here, in case we unload the nmethod because
1246 // it is pointing to some oop (other than the methodOop) being unloaded.
1247 if (_method != NULL) {
1248 // OSR methods point to the methodOop, but the methodOop does not
1249 // point back!
1250 if (_method->code() == this) {
1251 _method->clear_code(); // Break a cycle
1252 }
1253 _method = NULL; // Clear the method of this dead nmethod
1254 }
1255 // Make the class unloaded - i.e., change state and notify sweeper
1256 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
1257 if (is_in_use()) {
1258 // Transitioning directly from live to unloaded -- so
1259 // we need to force a cache clean-up; remember this
1260 // for later on.
1261 CodeCache::set_needs_cache_clean(true);
1262 }
1263 _state = unloaded;
1264
1265 // Log the unloading.
1266 log_state_change();
1267
1268 // The methodOop is gone at this point
1269 assert(_method == NULL, "Tautology");
1270
1271 set_osr_link(NULL);
1272 //set_scavenge_root_link(NULL); // done by prune_scavenge_root_nmethods
1273 NMethodSweeper::notify(this);
1274 }
1275
1276 void nmethod::invalidate_osr_method() {
1277 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
1278 // Remove from list of active nmethods
1279 if (method() != NULL)
1280 instanceKlass::cast(method()->method_holder())->remove_osr_nmethod(this);
1281 // Set entry as invalid
1282 _entry_bci = InvalidOSREntryBci;
1283 }
1284
1285 void nmethod::log_state_change() const {
1286 if (LogCompilation) {
1287 if (xtty != NULL) {
1288 ttyLocker ttyl; // keep the following output all in one block
1289 if (_state == unloaded) {
1290 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'",
1291 os::current_thread_id());
1292 } else {
1293 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s",
1294 os::current_thread_id(),
1295 (_state == zombie ? " zombie='1'" : ""));
1296 }
1297 log_identity(xtty);
1298 xtty->stamp();
1299 xtty->end_elem();
1300 }
1301 }
1302 if (PrintCompilation && _state != unloaded) {
1303 print_on(tty, _state == zombie ? "made zombie " : "made not entrant ");
1304 tty->cr();
1305 }
1306 }
1307
1308 // Common functionality for both make_not_entrant and make_zombie
1309 bool nmethod::make_not_entrant_or_zombie(unsigned int state) {
1310 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant");
1311
1312 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below.
1313 nmethodLocker nml(this);
1314 methodHandle the_method(method());
1315 No_Safepoint_Verifier nsv;
1316
1317 {
1318 // If the method is already zombie there is nothing to do
1319 if (is_zombie()) {
1320 return false;
1321 }
1322
1323 // invalidate osr nmethod before acquiring the patching lock since
1324 // they both acquire leaf locks and we don't want a deadlock.
1325 // This logic is equivalent to the logic below for patching the
1326 // verified entry point of regular methods.
1327 if (is_osr_method()) {
1328 // this effectively makes the osr nmethod not entrant
1329 invalidate_osr_method();
1330 }
1331
1332 // Enter critical section. Does not block for safepoint.
1333 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1334
1335 if (_state == state) {
1336 // another thread already performed this transition so nothing
1337 // to do, but return false to indicate this.
1338 return false;
1339 }
1340
1341 // The caller can be calling the method statically or through an inline
1342 // cache call.
1343 if (!is_osr_method() && !is_not_entrant()) {
1344 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
1345 SharedRuntime::get_handle_wrong_method_stub());
1346 }
1347
1348 if (is_in_use()) {
1349 // It's a true state change, so mark the method as decompiled.
1350 // Do it only for transition from alive.
1351 inc_decompile_count();
1352 }
1353
1354 // Change state
1355 _state = state;
1356
1357 // Log the transition once
1358 log_state_change();
1359
1360 // Remove nmethod from method.
1361 // We need to check if both the _code and _from_compiled_code_entry_point
1362 // refer to this nmethod because there is a race in setting these two fields
1363 // in methodOop as seen in bugid 4947125.
1364 // If the vep() points to the zombie nmethod, the memory for the nmethod
1365 // could be flushed and the compiler and vtable stubs could still call
1366 // through it.
1367 if (method() != NULL && (method()->code() == this ||
1368 method()->from_compiled_entry() == verified_entry_point())) {
1369 HandleMark hm;
1370 method()->clear_code();
1371 }
1372
1373 if (state == not_entrant) {
1374 mark_as_seen_on_stack();
1375 }
1376
1377 } // leave critical region under Patching_lock
1378
1379 // When the nmethod becomes zombie it is no longer alive so the
1380 // dependencies must be flushed. nmethods in the not_entrant
1381 // state will be flushed later when the transition to zombie
1382 // happens or they get unloaded.
1383 if (state == zombie) {
1384 {
1385 // Flushing dependecies must be done before any possible
1386 // safepoint can sneak in, otherwise the oops used by the
1387 // dependency logic could have become stale.
1388 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1389 flush_dependencies(NULL);
1390 }
1391
1392 {
1393 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload event
1394 // and it hasn't already been reported for this nmethod then report it now.
1395 // (the event may have been reported earilier if the GC marked it for unloading).
1396 Pause_No_Safepoint_Verifier pnsv(&nsv);
1397 post_compiled_method_unload();
1398 }
1399
1400 #ifdef ASSERT
1401 // It's no longer safe to access the oops section since zombie
1402 // nmethods aren't scanned for GC.
1403 _oops_are_stale = true;
1404 #endif
1405 } else {
1406 assert(state == not_entrant, "other cases may need to be handled differently");
1407 }
1408
1409 if (TraceCreateZombies) {
1410 tty->print_cr("nmethod <" INTPTR_FORMAT "> code made %s", this, (state == not_entrant) ? "not entrant" : "zombie");
1411 }
1412
1413 // Make sweeper aware that there is a zombie method that needs to be removed
1414 NMethodSweeper::notify(this);
1415
1416 return true;
1417 }
1418
1419 void nmethod::flush() {
1420 // Note that there are no valid oops in the nmethod anymore.
1421 assert(is_zombie() || (is_osr_method() && is_unloaded()), "must be a zombie method");
1422 assert(is_marked_for_reclamation() || (is_osr_method() && is_unloaded()), "must be marked for reclamation");
1423
1424 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed");
1425 assert_locked_or_safepoint(CodeCache_lock);
1426
1427 // completely deallocate this method
1428 EventMark m("flushing nmethod " INTPTR_FORMAT " %s", this, "");
1429 if (PrintMethodFlushing) {
1430 tty->print_cr("*flushing nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT "/Free CodeCache:" SIZE_FORMAT "Kb",
1431 _compile_id, this, CodeCache::nof_blobs(), CodeCache::unallocated_capacity()/1024);
1432 }
1433
1434 // We need to deallocate any ExceptionCache data.
1435 // Note that we do not need to grab the nmethod lock for this, it
1436 // better be thread safe if we're disposing of it!
1437 ExceptionCache* ec = exception_cache();
1438 set_exception_cache(NULL);
1439 while(ec != NULL) {
1440 ExceptionCache* next = ec->next();
1441 delete ec;
1442 ec = next;
1443 }
1444
1445 if (on_scavenge_root_list()) {
1446 CodeCache::drop_scavenge_root_nmethod(this);
1447 }
1448
1449 if (is_speculatively_disconnected()) {
1450 CodeCache::remove_saved_code(this);
1451 }
1452
1453 #ifdef SHARK
1454 ((SharkCompiler *) compiler())->free_compiled_method(insts_begin());
1455 #endif // SHARK
1456
1457 ((CodeBlob*)(this))->flush();
1458
1459 CodeCache::free(this);
1460 }
1461
1462
1463 //
1464 // Notify all classes this nmethod is dependent on that it is no
1465 // longer dependent. This should only be called in two situations.
1466 // First, when a nmethod transitions to a zombie all dependents need
1467 // to be clear. Since zombification happens at a safepoint there's no
1468 // synchronization issues. The second place is a little more tricky.
1469 // During phase 1 of mark sweep class unloading may happen and as a
1470 // result some nmethods may get unloaded. In this case the flushing
1471 // of dependencies must happen during phase 1 since after GC any
1472 // dependencies in the unloaded nmethod won't be updated, so
1473 // traversing the dependency information in unsafe. In that case this
1474 // function is called with a non-NULL argument and this function only
1475 // notifies instanceKlasses that are reachable
1476
1477 void nmethod::flush_dependencies(BoolObjectClosure* is_alive) {
1478 assert_locked_or_safepoint(CodeCache_lock);
1479 assert(Universe::heap()->is_gc_active() == (is_alive != NULL),
1480 "is_alive is non-NULL if and only if we are called during GC");
1481 if (!has_flushed_dependencies()) {
1482 set_has_flushed_dependencies();
1483 for (Dependencies::DepStream deps(this); deps.next(); ) {
1484 klassOop klass = deps.context_type();
1485 if (klass == NULL) continue; // ignore things like evol_method
1486
1487 // During GC the is_alive closure is non-NULL, and is used to
1488 // determine liveness of dependees that need to be updated.
1489 if (is_alive == NULL || is_alive->do_object_b(klass)) {
1490 instanceKlass::cast(klass)->remove_dependent_nmethod(this);
1491 }
1492 }
1493 }
1494 }
1495
1496
1497 // If this oop is not live, the nmethod can be unloaded.
1498 bool nmethod::can_unload(BoolObjectClosure* is_alive,
1499 OopClosure* keep_alive,
1500 oop* root, bool unloading_occurred) {
1501 assert(root != NULL, "just checking");
1502 oop obj = *root;
1503 if (obj == NULL || is_alive->do_object_b(obj)) {
1504 return false;
1505 }
1506 if (obj->is_compiledICHolder()) {
1507 compiledICHolderOop cichk_oop = compiledICHolderOop(obj);
1508 if (is_alive->do_object_b(
1509 cichk_oop->holder_method()->method_holder()) &&
1510 is_alive->do_object_b(cichk_oop->holder_klass())) {
1511 // The oop should be kept alive
1512 keep_alive->do_oop(root);
1513 return false;
1514 }
1515 }
1516 // If ScavengeRootsInCode is true, an nmethod might be unloaded
1517 // simply because one of its constant oops has gone dead.
1518 // No actual classes need to be unloaded in order for this to occur.
1519 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading");
1520 make_unloaded(is_alive, obj);
1521 return true;
1522 }
1523
1524 // ------------------------------------------------------------------
1525 // post_compiled_method_load_event
1526 // new method for install_code() path
1527 // Transfer information from compilation to jvmti
1528 void nmethod::post_compiled_method_load_event() {
1529
1530 methodOop moop = method();
1531 HS_DTRACE_PROBE8(hotspot, compiled__method__load,
1532 moop->klass_name()->bytes(),
1533 moop->klass_name()->utf8_length(),
1534 moop->name()->bytes(),
1535 moop->name()->utf8_length(),
1536 moop->signature()->bytes(),
1537 moop->signature()->utf8_length(),
1538 insts_begin(), insts_size());
1539
1540 if (JvmtiExport::should_post_compiled_method_load() ||
1541 JvmtiExport::should_post_compiled_method_unload()) {
1542 get_and_cache_jmethod_id();
1543 }
1544
1545 if (JvmtiExport::should_post_compiled_method_load()) {
1546 // Let the Service thread (which is a real Java thread) post the event
1547 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1548 JvmtiDeferredEventQueue::enqueue(
1549 JvmtiDeferredEvent::compiled_method_load_event(this));
1550 }
1551 }
1552
1553 jmethodID nmethod::get_and_cache_jmethod_id() {
1554 if (_jmethod_id == NULL) {
1555 // Cache the jmethod_id since it can no longer be looked up once the
1556 // method itself has been marked for unloading.
1557 _jmethod_id = method()->jmethod_id();
1558 }
1559 return _jmethod_id;
1560 }
1561
1562 void nmethod::post_compiled_method_unload() {
1563 if (unload_reported()) {
1564 // During unloading we transition to unloaded and then to zombie
1565 // and the unloading is reported during the first transition.
1566 return;
1567 }
1568
1569 assert(_method != NULL && !is_unloaded(), "just checking");
1570 DTRACE_METHOD_UNLOAD_PROBE(method());
1571
1572 // If a JVMTI agent has enabled the CompiledMethodUnload event then
1573 // post the event. Sometime later this nmethod will be made a zombie
1574 // by the sweeper but the methodOop will not be valid at that point.
1575 // If the _jmethod_id is null then no load event was ever requested
1576 // so don't bother posting the unload. The main reason for this is
1577 // that the jmethodID is a weak reference to the methodOop so if
1578 // it's being unloaded there's no way to look it up since the weak
1579 // ref will have been cleared.
1580 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) {
1581 assert(!unload_reported(), "already unloaded");
1582 JvmtiDeferredEvent event =
1583 JvmtiDeferredEvent::compiled_method_unload_event(
1584 _jmethod_id, insts_begin());
1585 if (SafepointSynchronize::is_at_safepoint()) {
1586 // Don't want to take the queueing lock. Add it as pending and
1587 // it will get enqueued later.
1588 JvmtiDeferredEventQueue::add_pending_event(event);
1589 } else {
1590 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1591 JvmtiDeferredEventQueue::enqueue(event);
1592 }
1593 }
1594
1595 // The JVMTI CompiledMethodUnload event can be enabled or disabled at
1596 // any time. As the nmethod is being unloaded now we mark it has
1597 // having the unload event reported - this will ensure that we don't
1598 // attempt to report the event in the unlikely scenario where the
1599 // event is enabled at the time the nmethod is made a zombie.
1600 set_unload_reported();
1601 }
1602
1603 // This is called at the end of the strong tracing/marking phase of a
1604 // GC to unload an nmethod if it contains otherwise unreachable
1605 // oops.
1606
1607 void nmethod::do_unloading(BoolObjectClosure* is_alive,
1608 OopClosure* keep_alive, bool unloading_occurred) {
1609 // Make sure the oop's ready to receive visitors
1610 assert(!is_zombie() && !is_unloaded(),
1611 "should not call follow on zombie or unloaded nmethod");
1612
1613 // If the method is not entrant then a JMP is plastered over the
1614 // first few bytes. If an oop in the old code was there, that oop
1615 // should not get GC'd. Skip the first few bytes of oops on
1616 // not-entrant methods.
1617 address low_boundary = verified_entry_point();
1618 if (is_not_entrant()) {
1619 low_boundary += NativeJump::instruction_size;
1620 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1621 // (See comment above.)
1622 }
1623
1624 // The RedefineClasses() API can cause the class unloading invariant
1625 // to no longer be true. See jvmtiExport.hpp for details.
1626 // Also, leave a debugging breadcrumb in local flag.
1627 bool a_class_was_redefined = JvmtiExport::has_redefined_a_class();
1628 if (a_class_was_redefined) {
1629 // This set of the unloading_occurred flag is done before the
1630 // call to post_compiled_method_unload() so that the unloading
1631 // of this nmethod is reported.
1632 unloading_occurred = true;
1633 }
1634
1635 // Follow methodOop
1636 if (can_unload(is_alive, keep_alive, (oop*)&_method, unloading_occurred)) {
1637 return;
1638 }
1639
1640 // Exception cache
1641 ExceptionCache* ec = exception_cache();
1642 while (ec != NULL) {
1643 oop* ex_addr = (oop*)ec->exception_type_addr();
1644 oop ex = *ex_addr;
1645 ExceptionCache* next_ec = ec->next();
1646 if (ex != NULL && !is_alive->do_object_b(ex)) {
1647 assert(!ex->is_compiledICHolder(), "Possible error here");
1648 remove_from_exception_cache(ec);
1649 }
1650 ec = next_ec;
1651 }
1652
1653 // If class unloading occurred we first iterate over all inline caches and
1654 // clear ICs where the cached oop is referring to an unloaded klass or method.
1655 // The remaining live cached oops will be traversed in the relocInfo::oop_type
1656 // iteration below.
1657 if (unloading_occurred) {
1658 RelocIterator iter(this, low_boundary);
1659 while(iter.next()) {
1660 if (iter.type() == relocInfo::virtual_call_type) {
1661 CompiledIC *ic = CompiledIC_at(iter.reloc());
1662 oop ic_oop = ic->cached_oop();
1663 if (ic_oop != NULL && !is_alive->do_object_b(ic_oop)) {
1664 // The only exception is compiledICHolder oops which may
1665 // yet be marked below. (We check this further below).
1666 if (ic_oop->is_compiledICHolder()) {
1667 compiledICHolderOop cichk_oop = compiledICHolderOop(ic_oop);
1668 if (is_alive->do_object_b(
1669 cichk_oop->holder_method()->method_holder()) &&
1670 is_alive->do_object_b(cichk_oop->holder_klass())) {
1671 continue;
1672 }
1673 }
1674 ic->set_to_clean();
1675 assert(ic->cached_oop() == NULL,
1676 "cached oop in IC should be cleared");
1677 }
1678 }
1679 }
1680 }
1681
1682 // Compiled code
1683 RelocIterator iter(this, low_boundary);
1684 while (iter.next()) {
1685 if (iter.type() == relocInfo::oop_type) {
1686 oop_Relocation* r = iter.oop_reloc();
1687 // In this loop, we must only traverse those oops directly embedded in
1688 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1689 assert(1 == (r->oop_is_immediate()) +
1690 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1691 "oop must be found in exactly one place");
1692 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1693 if (can_unload(is_alive, keep_alive, r->oop_addr(), unloading_occurred)) {
1694 return;
1695 }
1696 }
1697 }
1698 }
1699
1700
1701 // Scopes
1702 for (oop* p = oops_begin(); p < oops_end(); p++) {
1703 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1704 if (can_unload(is_alive, keep_alive, p, unloading_occurred)) {
1705 return;
1706 }
1707 }
1708
1709 #ifndef PRODUCT
1710 // This nmethod was not unloaded; check below that all CompiledICs
1711 // refer to marked oops.
1712 {
1713 RelocIterator iter(this, low_boundary);
1714 while (iter.next()) {
1715 if (iter.type() == relocInfo::virtual_call_type) {
1716 CompiledIC *ic = CompiledIC_at(iter.reloc());
1717 oop ic_oop = ic->cached_oop();
1718 assert(ic_oop == NULL || is_alive->do_object_b(ic_oop),
1719 "Found unmarked ic_oop in reachable nmethod");
1720 }
1721 }
1722 }
1723 #endif // !PRODUCT
1724 }
1725
1726 // This method is called twice during GC -- once while
1727 // tracing the "active" nmethods on thread stacks during
1728 // the (strong) marking phase, and then again when walking
1729 // the code cache contents during the weak roots processing
1730 // phase. The two uses are distinguished by means of the
1731 // 'do_strong_roots_only' flag, which is true in the first
1732 // case. We want to walk the weak roots in the nmethod
1733 // only in the second case. The weak roots in the nmethod
1734 // are the oops in the ExceptionCache and the InlineCache
1735 // oops.
1736 void nmethod::oops_do(OopClosure* f, bool do_strong_roots_only) {
1737 // make sure the oops ready to receive visitors
1738 assert(!is_zombie() && !is_unloaded(),
1739 "should not call follow on zombie or unloaded nmethod");
1740
1741 // If the method is not entrant or zombie then a JMP is plastered over the
1742 // first few bytes. If an oop in the old code was there, that oop
1743 // should not get GC'd. Skip the first few bytes of oops on
1744 // not-entrant methods.
1745 address low_boundary = verified_entry_point();
1746 if (is_not_entrant()) {
1747 low_boundary += NativeJump::instruction_size;
1748 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1749 // (See comment above.)
1750 }
1751
1752 // Compiled code
1753 f->do_oop((oop*) &_method);
1754 if (!do_strong_roots_only) {
1755 // weak roots processing phase -- update ExceptionCache oops
1756 ExceptionCache* ec = exception_cache();
1757 while(ec != NULL) {
1758 f->do_oop((oop*)ec->exception_type_addr());
1759 ec = ec->next();
1760 }
1761 } // Else strong roots phase -- skip oops in ExceptionCache
1762
1763 RelocIterator iter(this, low_boundary);
1764
1765 while (iter.next()) {
1766 if (iter.type() == relocInfo::oop_type ) {
1767 oop_Relocation* r = iter.oop_reloc();
1768 // In this loop, we must only follow those oops directly embedded in
1769 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1770 assert(1 == (r->oop_is_immediate()) +
1771 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1772 "oop must be found in exactly one place");
1773 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1774 f->do_oop(r->oop_addr());
1775 }
1776 }
1777 }
1778
1779 // Scopes
1780 // This includes oop constants not inlined in the code stream.
1781 for (oop* p = oops_begin(); p < oops_end(); p++) {
1782 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1783 f->do_oop(p);
1784 }
1785 }
1786
1787 #define NMETHOD_SENTINEL ((nmethod*)badAddress)
1788
1789 nmethod* volatile nmethod::_oops_do_mark_nmethods;
1790
1791 // An nmethod is "marked" if its _mark_link is set non-null.
1792 // Even if it is the end of the linked list, it will have a non-null link value,
1793 // as long as it is on the list.
1794 // This code must be MP safe, because it is used from parallel GC passes.
1795 bool nmethod::test_set_oops_do_mark() {
1796 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");
1797 nmethod* observed_mark_link = _oops_do_mark_link;
1798 if (observed_mark_link == NULL) {
1799 // Claim this nmethod for this thread to mark.
1800 observed_mark_link = (nmethod*)
1801 Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_link, NULL);
1802 if (observed_mark_link == NULL) {
1803
1804 // Atomically append this nmethod (now claimed) to the head of the list:
1805 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods;
1806 for (;;) {
1807 nmethod* required_mark_nmethods = observed_mark_nmethods;
1808 _oops_do_mark_link = required_mark_nmethods;
1809 observed_mark_nmethods = (nmethod*)
1810 Atomic::cmpxchg_ptr(this, &_oops_do_mark_nmethods, required_mark_nmethods);
1811 if (observed_mark_nmethods == required_mark_nmethods)
1812 break;
1813 }
1814 // Mark was clear when we first saw this guy.
1815 NOT_PRODUCT(if (TraceScavenge) print_on(tty, "oops_do, mark\n"));
1816 return false;
1817 }
1818 }
1819 // On fall through, another racing thread marked this nmethod before we did.
1820 return true;
1821 }
1822
1823 void nmethod::oops_do_marking_prologue() {
1824 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("[oops_do_marking_prologue"));
1825 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row");
1826 // We use cmpxchg_ptr instead of regular assignment here because the user
1827 // may fork a bunch of threads, and we need them all to see the same state.
1828 void* observed = Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, NULL);
1829 guarantee(observed == NULL, "no races in this sequential code");
1830 }
1831
1832 void nmethod::oops_do_marking_epilogue() {
1833 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row");
1834 nmethod* cur = _oops_do_mark_nmethods;
1835 while (cur != NMETHOD_SENTINEL) {
1836 assert(cur != NULL, "not NULL-terminated");
1837 nmethod* next = cur->_oops_do_mark_link;
1838 cur->_oops_do_mark_link = NULL;
1839 cur->fix_oop_relocations();
1840 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark\n"));
1841 cur = next;
1842 }
1843 void* required = _oops_do_mark_nmethods;
1844 void* observed = Atomic::cmpxchg_ptr(NULL, &_oops_do_mark_nmethods, required);
1845 guarantee(observed == required, "no races in this sequential code");
1846 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("oops_do_marking_epilogue]"));
1847 }
1848
1849 class DetectScavengeRoot: public OopClosure {
1850 bool _detected_scavenge_root;
1851 public:
1852 DetectScavengeRoot() : _detected_scavenge_root(false)
1853 { NOT_PRODUCT(_print_nm = NULL); }
1854 bool detected_scavenge_root() { return _detected_scavenge_root; }
1855 virtual void do_oop(oop* p) {
1856 if ((*p) != NULL && (*p)->is_scavengable()) {
1857 NOT_PRODUCT(maybe_print(p));
1858 _detected_scavenge_root = true;
1859 }
1860 }
1861 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
1862
1863 #ifndef PRODUCT
1864 nmethod* _print_nm;
1865 void maybe_print(oop* p) {
1866 if (_print_nm == NULL) return;
1867 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root");
1868 tty->print_cr(""PTR_FORMAT"[offset=%d] detected non-perm oop "PTR_FORMAT" (found at "PTR_FORMAT")",
1869 _print_nm, (int)((intptr_t)p - (intptr_t)_print_nm),
1870 (intptr_t)(*p), (intptr_t)p);
1871 (*p)->print();
1872 }
1873 #endif //PRODUCT
1874 };
1875
1876 bool nmethod::detect_scavenge_root_oops() {
1877 DetectScavengeRoot detect_scavenge_root;
1878 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this);
1879 oops_do(&detect_scavenge_root);
1880 return detect_scavenge_root.detected_scavenge_root();
1881 }
1882
1883 // Method that knows how to preserve outgoing arguments at call. This method must be
1884 // called with a frame corresponding to a Java invoke
1885 void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) {
1886 #ifndef SHARK
1887 if (!method()->is_native()) {
1888 SimpleScopeDesc ssd(this, fr.pc());
1889 Bytecode_invoke call(ssd.method(), ssd.bci());
1890 bool has_receiver = call.has_receiver();
1891 Symbol* signature = call.signature();
1892 fr.oops_compiled_arguments_do(signature, has_receiver, reg_map, f);
1893 }
1894 #endif // !SHARK
1895 }
1896
1897
1898 oop nmethod::embeddedOop_at(u_char* p) {
1899 RelocIterator iter(this, p, p + oopSize);
1900 while (iter.next())
1901 if (iter.type() == relocInfo::oop_type) {
1902 return iter.oop_reloc()->oop_value();
1903 }
1904 return NULL;
1905 }
1906
1907
1908 inline bool includes(void* p, void* from, void* to) {
1909 return from <= p && p < to;
1910 }
1911
1912
1913 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
1914 assert(count >= 2, "must be sentinel values, at least");
1915
1916 #ifdef ASSERT
1917 // must be sorted and unique; we do a binary search in find_pc_desc()
1918 int prev_offset = pcs[0].pc_offset();
1919 assert(prev_offset == PcDesc::lower_offset_limit,
1920 "must start with a sentinel");
1921 for (int i = 1; i < count; i++) {
1922 int this_offset = pcs[i].pc_offset();
1923 assert(this_offset > prev_offset, "offsets must be sorted");
1924 prev_offset = this_offset;
1925 }
1926 assert(prev_offset == PcDesc::upper_offset_limit,
1927 "must end with a sentinel");
1928 #endif //ASSERT
1929
1930 // Search for MethodHandle invokes and tag the nmethod.
1931 for (int i = 0; i < count; i++) {
1932 if (pcs[i].is_method_handle_invoke()) {
1933 set_has_method_handle_invokes(true);
1934 break;
1935 }
1936 }
1937 assert(has_method_handle_invokes() == (_deoptimize_mh_offset != -1), "must have deopt mh handler");
1938
1939 int size = count * sizeof(PcDesc);
1940 assert(scopes_pcs_size() >= size, "oob");
1941 memcpy(scopes_pcs_begin(), pcs, size);
1942
1943 // Adjust the final sentinel downward.
1944 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
1945 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
1946 last_pc->set_pc_offset(content_size() + 1);
1947 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
1948 // Fill any rounding gaps with copies of the last record.
1949 last_pc[1] = last_pc[0];
1950 }
1951 // The following assert could fail if sizeof(PcDesc) is not
1952 // an integral multiple of oopSize (the rounding term).
1953 // If it fails, change the logic to always allocate a multiple
1954 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
1955 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
1956 }
1957
1958 void nmethod::copy_scopes_data(u_char* buffer, int size) {
1959 assert(scopes_data_size() >= size, "oob");
1960 memcpy(scopes_data_begin(), buffer, size);
1961 }
1962
1963
1964 #ifdef ASSERT
1965 static PcDesc* linear_search(nmethod* nm, int pc_offset, bool approximate) {
1966 PcDesc* lower = nm->scopes_pcs_begin();
1967 PcDesc* upper = nm->scopes_pcs_end();
1968 lower += 1; // exclude initial sentinel
1969 PcDesc* res = NULL;
1970 for (PcDesc* p = lower; p < upper; p++) {
1971 NOT_PRODUCT(--nmethod_stats.pc_desc_tests); // don't count this call to match_desc
1972 if (match_desc(p, pc_offset, approximate)) {
1973 if (res == NULL)
1974 res = p;
1975 else
1976 res = (PcDesc*) badAddress;
1977 }
1978 }
1979 return res;
1980 }
1981 #endif
1982
1983
1984 // Finds a PcDesc with real-pc equal to "pc"
1985 PcDesc* nmethod::find_pc_desc_internal(address pc, bool approximate) {
1986 address base_address = code_begin();
1987 if ((pc < base_address) ||
1988 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
1989 return NULL; // PC is wildly out of range
1990 }
1991 int pc_offset = (int) (pc - base_address);
1992
1993 // Check the PcDesc cache if it contains the desired PcDesc
1994 // (This as an almost 100% hit rate.)
1995 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
1996 if (res != NULL) {
1997 assert(res == linear_search(this, pc_offset, approximate), "cache ok");
1998 return res;
1999 }
2000
2001 // Fallback algorithm: quasi-linear search for the PcDesc
2002 // Find the last pc_offset less than the given offset.
2003 // The successor must be the required match, if there is a match at all.
2004 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
2005 PcDesc* lower = scopes_pcs_begin();
2006 PcDesc* upper = scopes_pcs_end();
2007 upper -= 1; // exclude final sentinel
2008 if (lower >= upper) return NULL; // native method; no PcDescs at all
2009
2010 #define assert_LU_OK \
2011 /* invariant on lower..upper during the following search: */ \
2012 assert(lower->pc_offset() < pc_offset, "sanity"); \
2013 assert(upper->pc_offset() >= pc_offset, "sanity")
2014 assert_LU_OK;
2015
2016 // Use the last successful return as a split point.
2017 PcDesc* mid = _pc_desc_cache.last_pc_desc();
2018 NOT_PRODUCT(++nmethod_stats.pc_desc_searches);
2019 if (mid->pc_offset() < pc_offset) {
2020 lower = mid;
2021 } else {
2022 upper = mid;
2023 }
2024
2025 // Take giant steps at first (4096, then 256, then 16, then 1)
2026 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
2027 const int RADIX = (1 << LOG2_RADIX);
2028 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
2029 while ((mid = lower + step) < upper) {
2030 assert_LU_OK;
2031 NOT_PRODUCT(++nmethod_stats.pc_desc_searches);
2032 if (mid->pc_offset() < pc_offset) {
2033 lower = mid;
2034 } else {
2035 upper = mid;
2036 break;
2037 }
2038 }
2039 assert_LU_OK;
2040 }
2041
2042 // Sneak up on the value with a linear search of length ~16.
2043 while (true) {
2044 assert_LU_OK;
2045 mid = lower + 1;
2046 NOT_PRODUCT(++nmethod_stats.pc_desc_searches);
2047 if (mid->pc_offset() < pc_offset) {
2048 lower = mid;
2049 } else {
2050 upper = mid;
2051 break;
2052 }
2053 }
2054 #undef assert_LU_OK
2055
2056 if (match_desc(upper, pc_offset, approximate)) {
2057 assert(upper == linear_search(this, pc_offset, approximate), "search ok");
2058 _pc_desc_cache.add_pc_desc(upper);
2059 return upper;
2060 } else {
2061 assert(NULL == linear_search(this, pc_offset, approximate), "search ok");
2062 return NULL;
2063 }
2064 }
2065
2066
2067 bool nmethod::check_all_dependencies() {
2068 bool found_check = false;
2069 // wholesale check of all dependencies
2070 for (Dependencies::DepStream deps(this); deps.next(); ) {
2071 if (deps.check_dependency() != NULL) {
2072 found_check = true;
2073 NOT_DEBUG(break);
2074 }
2075 }
2076 return found_check; // tell caller if we found anything
2077 }
2078
2079 bool nmethod::check_dependency_on(DepChange& changes) {
2080 // What has happened:
2081 // 1) a new class dependee has been added
2082 // 2) dependee and all its super classes have been marked
2083 bool found_check = false; // set true if we are upset
2084 for (Dependencies::DepStream deps(this); deps.next(); ) {
2085 // Evaluate only relevant dependencies.
2086 if (deps.spot_check_dependency_at(changes) != NULL) {
2087 found_check = true;
2088 NOT_DEBUG(break);
2089 }
2090 }
2091 return found_check;
2092 }
2093
2094 bool nmethod::is_evol_dependent_on(klassOop dependee) {
2095 instanceKlass *dependee_ik = instanceKlass::cast(dependee);
2096 objArrayOop dependee_methods = dependee_ik->methods();
2097 for (Dependencies::DepStream deps(this); deps.next(); ) {
2098 if (deps.type() == Dependencies::evol_method) {
2099 methodOop method = deps.method_argument(0);
2100 for (int j = 0; j < dependee_methods->length(); j++) {
2101 if ((methodOop) dependee_methods->obj_at(j) == method) {
2102 // RC_TRACE macro has an embedded ResourceMark
2103 RC_TRACE(0x01000000,
2104 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)",
2105 _method->method_holder()->klass_part()->external_name(),
2106 _method->name()->as_C_string(),
2107 _method->signature()->as_C_string(), compile_id(),
2108 method->method_holder()->klass_part()->external_name(),
2109 method->name()->as_C_string(),
2110 method->signature()->as_C_string()));
2111 if (TraceDependencies || LogCompilation)
2112 deps.log_dependency(dependee);
2113 return true;
2114 }
2115 }
2116 }
2117 }
2118 return false;
2119 }
2120
2121 // Called from mark_for_deoptimization, when dependee is invalidated.
2122 bool nmethod::is_dependent_on_method(methodOop dependee) {
2123 for (Dependencies::DepStream deps(this); deps.next(); ) {
2124 if (deps.type() != Dependencies::evol_method)
2125 continue;
2126 methodOop method = deps.method_argument(0);
2127 if (method == dependee) return true;
2128 }
2129 return false;
2130 }
2131
2132
2133 bool nmethod::is_patchable_at(address instr_addr) {
2134 assert(insts_contains(instr_addr), "wrong nmethod used");
2135 if (is_zombie()) {
2136 // a zombie may never be patched
2137 return false;
2138 }
2139 return true;
2140 }
2141
2142
2143 address nmethod::continuation_for_implicit_exception(address pc) {
2144 // Exception happened outside inline-cache check code => we are inside
2145 // an active nmethod => use cpc to determine a return address
2146 int exception_offset = pc - code_begin();
2147 int cont_offset = ImplicitExceptionTable(this).at( exception_offset );
2148 #ifdef ASSERT
2149 if (cont_offset == 0) {
2150 Thread* thread = ThreadLocalStorage::get_thread_slow();
2151 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
2152 HandleMark hm(thread);
2153 ResourceMark rm(thread);
2154 CodeBlob* cb = CodeCache::find_blob(pc);
2155 assert(cb != NULL && cb == this, "");
2156 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, pc);
2157 print();
2158 method()->print_codes();
2159 print_code();
2160 print_pcs();
2161 }
2162 #endif
2163 if (cont_offset == 0) {
2164 // Let the normal error handling report the exception
2165 return NULL;
2166 }
2167 return code_begin() + cont_offset;
2168 }
2169
2170
2171
2172 void nmethod_init() {
2173 // make sure you didn't forget to adjust the filler fields
2174 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
2175 }
2176
2177
2178 //-------------------------------------------------------------------------------------------
2179
2180
2181 // QQQ might we make this work from a frame??
2182 nmethodLocker::nmethodLocker(address pc) {
2183 CodeBlob* cb = CodeCache::find_blob(pc);
2184 guarantee(cb != NULL && cb->is_nmethod(), "bad pc for a nmethod found");
2185 _nm = (nmethod*)cb;
2186 lock_nmethod(_nm);
2187 }
2188
2189 void nmethodLocker::lock_nmethod(nmethod* nm) {
2190 if (nm == NULL) return;
2191 Atomic::inc(&nm->_lock_count);
2192 guarantee(!nm->is_zombie(), "cannot lock a zombie method");
2193 }
2194
2195 void nmethodLocker::unlock_nmethod(nmethod* nm) {
2196 if (nm == NULL) return;
2197 Atomic::dec(&nm->_lock_count);
2198 guarantee(nm->_lock_count >= 0, "unmatched nmethod lock/unlock");
2199 }
2200
2201
2202 // -----------------------------------------------------------------------------
2203 // nmethod::get_deopt_original_pc
2204 //
2205 // Return the original PC for the given PC if:
2206 // (a) the given PC belongs to a nmethod and
2207 // (b) it is a deopt PC
2208 address nmethod::get_deopt_original_pc(const frame* fr) {
2209 if (fr->cb() == NULL) return NULL;
2210
2211 nmethod* nm = fr->cb()->as_nmethod_or_null();
2212 if (nm != NULL && nm->is_deopt_pc(fr->pc()))
2213 return nm->get_original_pc(fr);
2214
2215 return NULL;
2216 }
2217
2218
2219 // -----------------------------------------------------------------------------
2220 // MethodHandle
2221
2222 bool nmethod::is_method_handle_return(address return_pc) {
2223 if (!has_method_handle_invokes()) return false;
2224 PcDesc* pd = pc_desc_at(return_pc);
2225 if (pd == NULL)
2226 return false;
2227 return pd->is_method_handle_invoke();
2228 }
2229
2230
2231 // -----------------------------------------------------------------------------
2232 // Verification
2233
2234 class VerifyOopsClosure: public OopClosure {
2235 nmethod* _nm;
2236 bool _ok;
2237 public:
2238 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
2239 bool ok() { return _ok; }
2240 virtual void do_oop(oop* p) {
2241 if ((*p) == NULL || (*p)->is_oop()) return;
2242 if (_ok) {
2243 _nm->print_nmethod(true);
2244 _ok = false;
2245 }
2246 tty->print_cr("*** non-oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)",
2247 (intptr_t)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm));
2248 }
2249 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2250 };
2251
2252 void nmethod::verify() {
2253
2254 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant
2255 // seems odd.
2256
2257 if( is_zombie() || is_not_entrant() )
2258 return;
2259
2260 // Make sure all the entry points are correctly aligned for patching.
2261 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
2262
2263 assert(method()->is_oop(), "must be valid");
2264
2265 ResourceMark rm;
2266
2267 if (!CodeCache::contains(this)) {
2268 fatal(err_msg("nmethod at " INTPTR_FORMAT " not in zone", this));
2269 }
2270
2271 if(is_native_method() )
2272 return;
2273
2274 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
2275 if (nm != this) {
2276 fatal(err_msg("findNMethod did not find this nmethod (" INTPTR_FORMAT ")",
2277 this));
2278 }
2279
2280 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2281 if (! p->verify(this)) {
2282 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", this);
2283 }
2284 }
2285
2286 VerifyOopsClosure voc(this);
2287 oops_do(&voc);
2288 assert(voc.ok(), "embedded oops must be OK");
2289 verify_scavenge_root_oops();
2290
2291 verify_scopes();
2292 }
2293
2294
2295 void nmethod::verify_interrupt_point(address call_site) {
2296 // This code does not work in release mode since
2297 // owns_lock only is available in debug mode.
2298 CompiledIC* ic = NULL;
2299 Thread *cur = Thread::current();
2300 if (CompiledIC_lock->owner() == cur ||
2301 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) &&
2302 SafepointSynchronize::is_at_safepoint())) {
2303 ic = CompiledIC_at(call_site);
2304 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
2305 } else {
2306 MutexLocker ml_verify (CompiledIC_lock);
2307 ic = CompiledIC_at(call_site);
2308 }
2309 PcDesc* pd = pc_desc_at(ic->end_of_call());
2310 assert(pd != NULL, "PcDesc must exist");
2311 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(),
2312 pd->obj_decode_offset(), pd->should_reexecute(),
2313 pd->return_oop());
2314 !sd->is_top(); sd = sd->sender()) {
2315 sd->verify();
2316 }
2317 }
2318
2319 void nmethod::verify_scopes() {
2320 if( !method() ) return; // Runtime stubs have no scope
2321 if (method()->is_native()) return; // Ignore stub methods.
2322 // iterate through all interrupt point
2323 // and verify the debug information is valid.
2324 RelocIterator iter((nmethod*)this);
2325 while (iter.next()) {
2326 address stub = NULL;
2327 switch (iter.type()) {
2328 case relocInfo::virtual_call_type:
2329 verify_interrupt_point(iter.addr());
2330 break;
2331 case relocInfo::opt_virtual_call_type:
2332 stub = iter.opt_virtual_call_reloc()->static_stub();
2333 verify_interrupt_point(iter.addr());
2334 break;
2335 case relocInfo::static_call_type:
2336 stub = iter.static_call_reloc()->static_stub();
2337 //verify_interrupt_point(iter.addr());
2338 break;
2339 case relocInfo::runtime_call_type:
2340 address destination = iter.reloc()->value();
2341 // Right now there is no way to find out which entries support
2342 // an interrupt point. It would be nice if we had this
2343 // information in a table.
2344 break;
2345 }
2346 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section");
2347 }
2348 }
2349
2350
2351 // -----------------------------------------------------------------------------
2352 // Non-product code
2353 #ifndef PRODUCT
2354
2355 class DebugScavengeRoot: public OopClosure {
2356 nmethod* _nm;
2357 bool _ok;
2358 public:
2359 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { }
2360 bool ok() { return _ok; }
2361 virtual void do_oop(oop* p) {
2362 if ((*p) == NULL || !(*p)->is_scavengable()) return;
2363 if (_ok) {
2364 _nm->print_nmethod(true);
2365 _ok = false;
2366 }
2367 tty->print_cr("*** non-perm oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)",
2368 (intptr_t)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm));
2369 (*p)->print();
2370 }
2371 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2372 };
2373
2374 void nmethod::verify_scavenge_root_oops() {
2375 if (!on_scavenge_root_list()) {
2376 // Actually look inside, to verify the claim that it's clean.
2377 DebugScavengeRoot debug_scavenge_root(this);
2378 oops_do(&debug_scavenge_root);
2379 if (!debug_scavenge_root.ok())
2380 fatal("found an unadvertised bad non-perm oop in the code cache");
2381 }
2382 assert(scavenge_root_not_marked(), "");
2383 }
2384
2385 #endif // PRODUCT
2386
2387 // Printing operations
2388
2389 void nmethod::print() const {
2390 ResourceMark rm;
2391 ttyLocker ttyl; // keep the following output all in one block
2392
2393 tty->print("Compiled ");
2394
2395 if (is_compiled_by_c1()) {
2396 tty->print("(c1) ");
2397 } else if (is_compiled_by_c2()) {
2398 tty->print("(c2) ");
2399 } else if (is_compiled_by_shark()) {
2400 tty->print("(shark) ");
2401 } else {
2402 tty->print("(nm) ");
2403 }
2404
2405 print_on(tty, "nmethod");
2406 tty->cr();
2407 if (WizardMode) {
2408 tty->print("((nmethod*) "INTPTR_FORMAT ") ", this);
2409 tty->print(" for method " INTPTR_FORMAT , (address)method());
2410 tty->print(" { ");
2411 if (is_in_use()) tty->print("in_use ");
2412 if (is_not_entrant()) tty->print("not_entrant ");
2413 if (is_zombie()) tty->print("zombie ");
2414 if (is_unloaded()) tty->print("unloaded ");
2415 if (on_scavenge_root_list()) tty->print("scavenge_root ");
2416 tty->print_cr("}:");
2417 }
2418 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2419 (address)this,
2420 (address)this + size(),
2421 size());
2422 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2423 relocation_begin(),
2424 relocation_end(),
2425 relocation_size());
2426 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2427 consts_begin(),
2428 consts_end(),
2429 consts_size());
2430 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2431 insts_begin(),
2432 insts_end(),
2433 insts_size());
2434 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2435 stub_begin(),
2436 stub_end(),
2437 stub_size());
2438 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2439 oops_begin(),
2440 oops_end(),
2441 oops_size());
2442 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2443 scopes_data_begin(),
2444 scopes_data_end(),
2445 scopes_data_size());
2446 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2447 scopes_pcs_begin(),
2448 scopes_pcs_end(),
2449 scopes_pcs_size());
2450 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2451 dependencies_begin(),
2452 dependencies_end(),
2453 dependencies_size());
2454 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2455 handler_table_begin(),
2456 handler_table_end(),
2457 handler_table_size());
2458 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2459 nul_chk_table_begin(),
2460 nul_chk_table_end(),
2461 nul_chk_table_size());
2462 }
2463
2464 void nmethod::print_code() {
2465 HandleMark hm;
2466 ResourceMark m;
2467 Disassembler::decode(this);
2468 }
2469
2470
2471 #ifndef PRODUCT
2472
2473 void nmethod::print_scopes() {
2474 // Find the first pc desc for all scopes in the code and print it.
2475 ResourceMark rm;
2476 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2477 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
2478 continue;
2479
2480 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
2481 sd->print_on(tty, p);
2482 }
2483 }
2484
2485 void nmethod::print_dependencies() {
2486 ResourceMark rm;
2487 ttyLocker ttyl; // keep the following output all in one block
2488 tty->print_cr("Dependencies:");
2489 for (Dependencies::DepStream deps(this); deps.next(); ) {
2490 deps.print_dependency();
2491 klassOop ctxk = deps.context_type();
2492 if (ctxk != NULL) {
2493 Klass* k = Klass::cast(ctxk);
2494 if (k->oop_is_instance() && ((instanceKlass*)k)->is_dependent_nmethod(this)) {
2495 tty->print_cr(" [nmethod<=klass]%s", k->external_name());
2496 }
2497 }
2498 deps.log_dependency(); // put it into the xml log also
2499 }
2500 }
2501
2502
2503 void nmethod::print_relocations() {
2504 ResourceMark m; // in case methods get printed via the debugger
2505 tty->print_cr("relocations:");
2506 RelocIterator iter(this);
2507 iter.print();
2508 if (UseRelocIndex) {
2509 jint* index_end = (jint*)relocation_end() - 1;
2510 jint index_size = *index_end;
2511 jint* index_start = (jint*)( (address)index_end - index_size );
2512 tty->print_cr(" index @" INTPTR_FORMAT ": index_size=%d", index_start, index_size);
2513 if (index_size > 0) {
2514 jint* ip;
2515 for (ip = index_start; ip+2 <= index_end; ip += 2)
2516 tty->print_cr(" (%d %d) addr=" INTPTR_FORMAT " @" INTPTR_FORMAT,
2517 ip[0],
2518 ip[1],
2519 header_end()+ip[0],
2520 relocation_begin()-1+ip[1]);
2521 for (; ip < index_end; ip++)
2522 tty->print_cr(" (%d ?)", ip[0]);
2523 tty->print_cr(" @" INTPTR_FORMAT ": index_size=%d", ip, *ip++);
2524 tty->print_cr("reloc_end @" INTPTR_FORMAT ":", ip);
2525 }
2526 }
2527 }
2528
2529
2530 void nmethod::print_pcs() {
2531 ResourceMark m; // in case methods get printed via debugger
2532 tty->print_cr("pc-bytecode offsets:");
2533 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2534 p->print(this);
2535 }
2536 }
2537
2538 #endif // PRODUCT
2539
2540 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
2541 RelocIterator iter(this, begin, end);
2542 bool have_one = false;
2543 while (iter.next()) {
2544 have_one = true;
2545 switch (iter.type()) {
2546 case relocInfo::none: return "no_reloc";
2547 case relocInfo::oop_type: {
2548 stringStream st;
2549 oop_Relocation* r = iter.oop_reloc();
2550 oop obj = r->oop_value();
2551 st.print("oop(");
2552 if (obj == NULL) st.print("NULL");
2553 else obj->print_value_on(&st);
2554 st.print(")");
2555 return st.as_string();
2556 }
2557 case relocInfo::virtual_call_type: return "virtual_call";
2558 case relocInfo::opt_virtual_call_type: return "optimized virtual_call";
2559 case relocInfo::static_call_type: return "static_call";
2560 case relocInfo::static_stub_type: return "static_stub";
2561 case relocInfo::runtime_call_type: return "runtime_call";
2562 case relocInfo::external_word_type: return "external_word";
2563 case relocInfo::internal_word_type: return "internal_word";
2564 case relocInfo::section_word_type: return "section_word";
2565 case relocInfo::poll_type: return "poll";
2566 case relocInfo::poll_return_type: return "poll_return";
2567 case relocInfo::type_mask: return "type_bit_mask";
2568 }
2569 }
2570 return have_one ? "other" : NULL;
2571 }
2572
2573 // Return a the last scope in (begin..end]
2574 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
2575 PcDesc* p = pc_desc_near(begin+1);
2576 if (p != NULL && p->real_pc(this) <= end) {
2577 return new ScopeDesc(this, p->scope_decode_offset(),
2578 p->obj_decode_offset(), p->should_reexecute(),
2579 p->return_oop());
2580 }
2581 return NULL;
2582 }
2583
2584 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) {
2585 if (block_begin == entry_point()) stream->print_cr("[Entry Point]");
2586 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]");
2587 if (block_begin == exception_begin()) stream->print_cr("[Exception Handler]");
2588 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]");
2589 if (block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]");
2590
2591 if (has_method_handle_invokes())
2592 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]");
2593
2594 if (block_begin == consts_begin()) stream->print_cr("[Constants]");
2595
2596 if (block_begin == entry_point()) {
2597 methodHandle m = method();
2598 if (m.not_null()) {
2599 stream->print(" # ");
2600 m->print_value_on(stream);
2601 stream->cr();
2602 }
2603 if (m.not_null() && !is_osr_method()) {
2604 ResourceMark rm;
2605 int sizeargs = m->size_of_parameters();
2606 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
2607 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
2608 {
2609 int sig_index = 0;
2610 if (!m->is_static())
2611 sig_bt[sig_index++] = T_OBJECT; // 'this'
2612 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) {
2613 BasicType t = ss.type();
2614 sig_bt[sig_index++] = t;
2615 if (type2size[t] == 2) {
2616 sig_bt[sig_index++] = T_VOID;
2617 } else {
2618 assert(type2size[t] == 1, "size is 1 or 2");
2619 }
2620 }
2621 assert(sig_index == sizeargs, "");
2622 }
2623 const char* spname = "sp"; // make arch-specific?
2624 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false);
2625 int stack_slot_offset = this->frame_size() * wordSize;
2626 int tab1 = 14, tab2 = 24;
2627 int sig_index = 0;
2628 int arg_index = (m->is_static() ? 0 : -1);
2629 bool did_old_sp = false;
2630 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) {
2631 bool at_this = (arg_index == -1);
2632 bool at_old_sp = false;
2633 BasicType t = (at_this ? T_OBJECT : ss.type());
2634 assert(t == sig_bt[sig_index], "sigs in sync");
2635 if (at_this)
2636 stream->print(" # this: ");
2637 else
2638 stream->print(" # parm%d: ", arg_index);
2639 stream->move_to(tab1);
2640 VMReg fst = regs[sig_index].first();
2641 VMReg snd = regs[sig_index].second();
2642 if (fst->is_reg()) {
2643 stream->print("%s", fst->name());
2644 if (snd->is_valid()) {
2645 stream->print(":%s", snd->name());
2646 }
2647 } else if (fst->is_stack()) {
2648 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
2649 if (offset == stack_slot_offset) at_old_sp = true;
2650 stream->print("[%s+0x%x]", spname, offset);
2651 } else {
2652 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
2653 }
2654 stream->print(" ");
2655 stream->move_to(tab2);
2656 stream->print("= ");
2657 if (at_this) {
2658 m->method_holder()->print_value_on(stream);
2659 } else {
2660 bool did_name = false;
2661 if (!at_this && ss.is_object()) {
2662 Symbol* name = ss.as_symbol_or_null();
2663 if (name != NULL) {
2664 name->print_value_on(stream);
2665 did_name = true;
2666 }
2667 }
2668 if (!did_name)
2669 stream->print("%s", type2name(t));
2670 }
2671 if (at_old_sp) {
2672 stream->print(" (%s of caller)", spname);
2673 did_old_sp = true;
2674 }
2675 stream->cr();
2676 sig_index += type2size[t];
2677 arg_index += 1;
2678 if (!at_this) ss.next();
2679 }
2680 if (!did_old_sp) {
2681 stream->print(" # ");
2682 stream->move_to(tab1);
2683 stream->print("[%s+0x%x]", spname, stack_slot_offset);
2684 stream->print(" (%s of caller)", spname);
2685 stream->cr();
2686 }
2687 }
2688 }
2689 }
2690
2691 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) {
2692 // First, find an oopmap in (begin, end].
2693 // We use the odd half-closed interval so that oop maps and scope descs
2694 // which are tied to the byte after a call are printed with the call itself.
2695 address base = code_begin();
2696 OopMapSet* oms = oop_maps();
2697 if (oms != NULL) {
2698 for (int i = 0, imax = oms->size(); i < imax; i++) {
2699 OopMap* om = oms->at(i);
2700 address pc = base + om->offset();
2701 if (pc > begin) {
2702 if (pc <= end) {
2703 st->move_to(column);
2704 st->print("; ");
2705 om->print_on(st);
2706 }
2707 break;
2708 }
2709 }
2710 }
2711
2712 // Print any debug info present at this pc.
2713 ScopeDesc* sd = scope_desc_in(begin, end);
2714 if (sd != NULL) {
2715 st->move_to(column);
2716 if (sd->bci() == SynchronizationEntryBCI) {
2717 st->print(";*synchronization entry");
2718 } else {
2719 if (sd->method().is_null()) {
2720 st->print("method is NULL");
2721 } else if (sd->method()->is_native()) {
2722 st->print("method is native");
2723 } else {
2724 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci());
2725 st->print(";*%s", Bytecodes::name(bc));
2726 switch (bc) {
2727 case Bytecodes::_invokevirtual:
2728 case Bytecodes::_invokespecial:
2729 case Bytecodes::_invokestatic:
2730 case Bytecodes::_invokeinterface:
2731 {
2732 Bytecode_invoke invoke(sd->method(), sd->bci());
2733 st->print(" ");
2734 if (invoke.name() != NULL)
2735 invoke.name()->print_symbol_on(st);
2736 else
2737 st->print("<UNKNOWN>");
2738 break;
2739 }
2740 case Bytecodes::_getfield:
2741 case Bytecodes::_putfield:
2742 case Bytecodes::_getstatic:
2743 case Bytecodes::_putstatic:
2744 {
2745 Bytecode_field field(sd->method(), sd->bci());
2746 st->print(" ");
2747 if (field.name() != NULL)
2748 field.name()->print_symbol_on(st);
2749 else
2750 st->print("<UNKNOWN>");
2751 }
2752 }
2753 }
2754 }
2755
2756 // Print all scopes
2757 for (;sd != NULL; sd = sd->sender()) {
2758 st->move_to(column);
2759 st->print("; -");
2760 if (sd->method().is_null()) {
2761 st->print("method is NULL");
2762 } else {
2763 sd->method()->print_short_name(st);
2764 }
2765 int lineno = sd->method()->line_number_from_bci(sd->bci());
2766 if (lineno != -1) {
2767 st->print("@%d (line %d)", sd->bci(), lineno);
2768 } else {
2769 st->print("@%d", sd->bci());
2770 }
2771 st->cr();
2772 }
2773 }
2774
2775 // Print relocation information
2776 const char* str = reloc_string_for(begin, end);
2777 if (str != NULL) {
2778 if (sd != NULL) st->cr();
2779 st->move_to(column);
2780 st->print("; {%s}", str);
2781 }
2782 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin());
2783 if (cont_offset != 0) {
2784 st->move_to(column);
2785 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, code_begin() + cont_offset);
2786 }
2787
2788 }
2789
2790 #ifndef PRODUCT
2791
2792 void nmethod::print_value_on(outputStream* st) const {
2793 print_on(st, "nmethod");
2794 }
2795
2796 void nmethod::print_calls(outputStream* st) {
2797 RelocIterator iter(this);
2798 while (iter.next()) {
2799 switch (iter.type()) {
2800 case relocInfo::virtual_call_type:
2801 case relocInfo::opt_virtual_call_type: {
2802 VerifyMutexLocker mc(CompiledIC_lock);
2803 CompiledIC_at(iter.reloc())->print();
2804 break;
2805 }
2806 case relocInfo::static_call_type:
2807 st->print_cr("Static call at " INTPTR_FORMAT, iter.reloc()->addr());
2808 compiledStaticCall_at(iter.reloc())->print();
2809 break;
2810 }
2811 }
2812 }
2813
2814 void nmethod::print_handler_table() {
2815 ExceptionHandlerTable(this).print();
2816 }
2817
2818 void nmethod::print_nul_chk_table() {
2819 ImplicitExceptionTable(this).print(code_begin());
2820 }
2821
2822 void nmethod::print_statistics() {
2823 ttyLocker ttyl;
2824 if (xtty != NULL) xtty->head("statistics type='nmethod'");
2825 nmethod_stats.print_native_nmethod_stats();
2826 nmethod_stats.print_nmethod_stats();
2827 DebugInformationRecorder::print_statistics();
2828 nmethod_stats.print_pc_stats();
2829 Dependencies::print_statistics();
2830 if (xtty != NULL) xtty->tail("statistics");
2831 }
2832
2833 #endif // PRODUCT