Tue, 29 Apr 2014 15:17:27 +0200
8042195: Introduce umbrella header orderAccess.inline.hpp.
Reviewed-by: dholmes, kvn, stefank, twisti
1 /*
2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
25 #include "precompiled.hpp"
26 #include "code/codeCache.hpp"
27 #include "code/compiledIC.hpp"
28 #include "code/dependencies.hpp"
29 #include "code/nmethod.hpp"
30 #include "code/scopeDesc.hpp"
31 #include "compiler/abstractCompiler.hpp"
32 #include "compiler/compileBroker.hpp"
33 #include "compiler/compileLog.hpp"
34 #include "compiler/compilerOracle.hpp"
35 #include "compiler/disassembler.hpp"
36 #include "interpreter/bytecode.hpp"
37 #include "oops/methodData.hpp"
38 #include "prims/jvmtiRedefineClassesTrace.hpp"
39 #include "prims/jvmtiImpl.hpp"
40 #include "runtime/orderAccess.inline.hpp"
41 #include "runtime/sharedRuntime.hpp"
42 #include "runtime/sweeper.hpp"
43 #include "utilities/dtrace.hpp"
44 #include "utilities/events.hpp"
45 #include "utilities/xmlstream.hpp"
46 #ifdef SHARK
47 #include "shark/sharkCompiler.hpp"
48 #endif
50 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
52 #ifdef DTRACE_ENABLED
54 // Only bother with this argument setup if dtrace is available
56 #ifndef USDT2
57 HS_DTRACE_PROBE_DECL8(hotspot, compiled__method__load,
58 const char*, int, const char*, int, const char*, int, void*, size_t);
60 HS_DTRACE_PROBE_DECL6(hotspot, compiled__method__unload,
61 char*, int, char*, int, char*, int);
63 #define DTRACE_METHOD_UNLOAD_PROBE(method) \
64 { \
65 Method* m = (method); \
66 if (m != NULL) { \
67 Symbol* klass_name = m->klass_name(); \
68 Symbol* name = m->name(); \
69 Symbol* signature = m->signature(); \
70 HS_DTRACE_PROBE6(hotspot, compiled__method__unload, \
71 klass_name->bytes(), klass_name->utf8_length(), \
72 name->bytes(), name->utf8_length(), \
73 signature->bytes(), signature->utf8_length()); \
74 } \
75 }
76 #else /* USDT2 */
77 #define DTRACE_METHOD_UNLOAD_PROBE(method) \
78 { \
79 Method* m = (method); \
80 if (m != NULL) { \
81 Symbol* klass_name = m->klass_name(); \
82 Symbol* name = m->name(); \
83 Symbol* signature = m->signature(); \
84 HOTSPOT_COMPILED_METHOD_UNLOAD( \
85 (char *) klass_name->bytes(), klass_name->utf8_length(), \
86 (char *) name->bytes(), name->utf8_length(), \
87 (char *) signature->bytes(), signature->utf8_length()); \
88 } \
89 }
90 #endif /* USDT2 */
92 #else // ndef DTRACE_ENABLED
94 #define DTRACE_METHOD_UNLOAD_PROBE(method)
96 #endif
98 bool nmethod::is_compiled_by_c1() const {
99 if (compiler() == NULL) {
100 return false;
101 }
102 return compiler()->is_c1();
103 }
104 bool nmethod::is_compiled_by_c2() const {
105 if (compiler() == NULL) {
106 return false;
107 }
108 return compiler()->is_c2();
109 }
110 bool nmethod::is_compiled_by_shark() const {
111 if (compiler() == NULL) {
112 return false;
113 }
114 return compiler()->is_shark();
115 }
119 //---------------------------------------------------------------------------------
120 // NMethod statistics
121 // They are printed under various flags, including:
122 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation.
123 // (In the latter two cases, they like other stats are printed to the log only.)
125 #ifndef PRODUCT
126 // These variables are put into one block to reduce relocations
127 // and make it simpler to print from the debugger.
128 static
129 struct nmethod_stats_struct {
130 int nmethod_count;
131 int total_size;
132 int relocation_size;
133 int consts_size;
134 int insts_size;
135 int stub_size;
136 int scopes_data_size;
137 int scopes_pcs_size;
138 int dependencies_size;
139 int handler_table_size;
140 int nul_chk_table_size;
141 int oops_size;
143 void note_nmethod(nmethod* nm) {
144 nmethod_count += 1;
145 total_size += nm->size();
146 relocation_size += nm->relocation_size();
147 consts_size += nm->consts_size();
148 insts_size += nm->insts_size();
149 stub_size += nm->stub_size();
150 oops_size += nm->oops_size();
151 scopes_data_size += nm->scopes_data_size();
152 scopes_pcs_size += nm->scopes_pcs_size();
153 dependencies_size += nm->dependencies_size();
154 handler_table_size += nm->handler_table_size();
155 nul_chk_table_size += nm->nul_chk_table_size();
156 }
157 void print_nmethod_stats() {
158 if (nmethod_count == 0) return;
159 tty->print_cr("Statistics for %d bytecoded nmethods:", nmethod_count);
160 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size);
161 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size);
162 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size);
163 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size);
164 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size);
165 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size);
166 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size);
167 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size);
168 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size);
169 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size);
170 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size);
171 }
173 int native_nmethod_count;
174 int native_total_size;
175 int native_relocation_size;
176 int native_insts_size;
177 int native_oops_size;
178 void note_native_nmethod(nmethod* nm) {
179 native_nmethod_count += 1;
180 native_total_size += nm->size();
181 native_relocation_size += nm->relocation_size();
182 native_insts_size += nm->insts_size();
183 native_oops_size += nm->oops_size();
184 }
185 void print_native_nmethod_stats() {
186 if (native_nmethod_count == 0) return;
187 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count);
188 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size);
189 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size);
190 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size);
191 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size);
192 }
194 int pc_desc_resets; // number of resets (= number of caches)
195 int pc_desc_queries; // queries to nmethod::find_pc_desc
196 int pc_desc_approx; // number of those which have approximate true
197 int pc_desc_repeats; // number of _pc_descs[0] hits
198 int pc_desc_hits; // number of LRU cache hits
199 int pc_desc_tests; // total number of PcDesc examinations
200 int pc_desc_searches; // total number of quasi-binary search steps
201 int pc_desc_adds; // number of LUR cache insertions
203 void print_pc_stats() {
204 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query",
205 pc_desc_queries,
206 (double)(pc_desc_tests + pc_desc_searches)
207 / pc_desc_queries);
208 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d",
209 pc_desc_resets,
210 pc_desc_queries, pc_desc_approx,
211 pc_desc_repeats, pc_desc_hits,
212 pc_desc_tests, pc_desc_searches, pc_desc_adds);
213 }
214 } nmethod_stats;
215 #endif //PRODUCT
218 //---------------------------------------------------------------------------------
221 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) {
222 assert(pc != NULL, "Must be non null");
223 assert(exception.not_null(), "Must be non null");
224 assert(handler != NULL, "Must be non null");
226 _count = 0;
227 _exception_type = exception->klass();
228 _next = NULL;
230 add_address_and_handler(pc,handler);
231 }
234 address ExceptionCache::match(Handle exception, address pc) {
235 assert(pc != NULL,"Must be non null");
236 assert(exception.not_null(),"Must be non null");
237 if (exception->klass() == exception_type()) {
238 return (test_address(pc));
239 }
241 return NULL;
242 }
245 bool ExceptionCache::match_exception_with_space(Handle exception) {
246 assert(exception.not_null(),"Must be non null");
247 if (exception->klass() == exception_type() && count() < cache_size) {
248 return true;
249 }
250 return false;
251 }
254 address ExceptionCache::test_address(address addr) {
255 for (int i=0; i<count(); i++) {
256 if (pc_at(i) == addr) {
257 return handler_at(i);
258 }
259 }
260 return NULL;
261 }
264 bool ExceptionCache::add_address_and_handler(address addr, address handler) {
265 if (test_address(addr) == handler) return true;
266 if (count() < cache_size) {
267 set_pc_at(count(),addr);
268 set_handler_at(count(), handler);
269 increment_count();
270 return true;
271 }
272 return false;
273 }
276 // private method for handling exception cache
277 // These methods are private, and used to manipulate the exception cache
278 // directly.
279 ExceptionCache* nmethod::exception_cache_entry_for_exception(Handle exception) {
280 ExceptionCache* ec = exception_cache();
281 while (ec != NULL) {
282 if (ec->match_exception_with_space(exception)) {
283 return ec;
284 }
285 ec = ec->next();
286 }
287 return NULL;
288 }
291 //-----------------------------------------------------------------------------
294 // Helper used by both find_pc_desc methods.
295 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) {
296 NOT_PRODUCT(++nmethod_stats.pc_desc_tests);
297 if (!approximate)
298 return pc->pc_offset() == pc_offset;
299 else
300 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset();
301 }
303 void PcDescCache::reset_to(PcDesc* initial_pc_desc) {
304 if (initial_pc_desc == NULL) {
305 _pc_descs[0] = NULL; // native method; no PcDescs at all
306 return;
307 }
308 NOT_PRODUCT(++nmethod_stats.pc_desc_resets);
309 // reset the cache by filling it with benign (non-null) values
310 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel");
311 for (int i = 0; i < cache_size; i++)
312 _pc_descs[i] = initial_pc_desc;
313 }
315 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) {
316 NOT_PRODUCT(++nmethod_stats.pc_desc_queries);
317 NOT_PRODUCT(if (approximate) ++nmethod_stats.pc_desc_approx);
319 // Note: one might think that caching the most recently
320 // read value separately would be a win, but one would be
321 // wrong. When many threads are updating it, the cache
322 // line it's in would bounce between caches, negating
323 // any benefit.
325 // In order to prevent race conditions do not load cache elements
326 // repeatedly, but use a local copy:
327 PcDesc* res;
329 // Step one: Check the most recently added value.
330 res = _pc_descs[0];
331 if (res == NULL) return NULL; // native method; no PcDescs at all
332 if (match_desc(res, pc_offset, approximate)) {
333 NOT_PRODUCT(++nmethod_stats.pc_desc_repeats);
334 return res;
335 }
337 // Step two: Check the rest of the LRU cache.
338 for (int i = 1; i < cache_size; ++i) {
339 res = _pc_descs[i];
340 if (res->pc_offset() < 0) break; // optimization: skip empty cache
341 if (match_desc(res, pc_offset, approximate)) {
342 NOT_PRODUCT(++nmethod_stats.pc_desc_hits);
343 return res;
344 }
345 }
347 // Report failure.
348 return NULL;
349 }
351 void PcDescCache::add_pc_desc(PcDesc* pc_desc) {
352 NOT_PRODUCT(++nmethod_stats.pc_desc_adds);
353 // Update the LRU cache by shifting pc_desc forward.
354 for (int i = 0; i < cache_size; i++) {
355 PcDesc* next = _pc_descs[i];
356 _pc_descs[i] = pc_desc;
357 pc_desc = next;
358 }
359 }
361 // adjust pcs_size so that it is a multiple of both oopSize and
362 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple
363 // of oopSize, then 2*sizeof(PcDesc) is)
364 static int adjust_pcs_size(int pcs_size) {
365 int nsize = round_to(pcs_size, oopSize);
366 if ((nsize % sizeof(PcDesc)) != 0) {
367 nsize = pcs_size + sizeof(PcDesc);
368 }
369 assert((nsize % oopSize) == 0, "correct alignment");
370 return nsize;
371 }
373 //-----------------------------------------------------------------------------
376 void nmethod::add_exception_cache_entry(ExceptionCache* new_entry) {
377 assert(ExceptionCache_lock->owned_by_self(),"Must hold the ExceptionCache_lock");
378 assert(new_entry != NULL,"Must be non null");
379 assert(new_entry->next() == NULL, "Must be null");
381 if (exception_cache() != NULL) {
382 new_entry->set_next(exception_cache());
383 }
384 set_exception_cache(new_entry);
385 }
387 void nmethod::remove_from_exception_cache(ExceptionCache* ec) {
388 ExceptionCache* prev = NULL;
389 ExceptionCache* curr = exception_cache();
390 assert(curr != NULL, "nothing to remove");
391 // find the previous and next entry of ec
392 while (curr != ec) {
393 prev = curr;
394 curr = curr->next();
395 assert(curr != NULL, "ExceptionCache not found");
396 }
397 // now: curr == ec
398 ExceptionCache* next = curr->next();
399 if (prev == NULL) {
400 set_exception_cache(next);
401 } else {
402 prev->set_next(next);
403 }
404 delete curr;
405 }
408 // public method for accessing the exception cache
409 // These are the public access methods.
410 address nmethod::handler_for_exception_and_pc(Handle exception, address pc) {
411 // We never grab a lock to read the exception cache, so we may
412 // have false negatives. This is okay, as it can only happen during
413 // the first few exception lookups for a given nmethod.
414 ExceptionCache* ec = exception_cache();
415 while (ec != NULL) {
416 address ret_val;
417 if ((ret_val = ec->match(exception,pc)) != NULL) {
418 return ret_val;
419 }
420 ec = ec->next();
421 }
422 return NULL;
423 }
426 void nmethod::add_handler_for_exception_and_pc(Handle exception, address pc, address handler) {
427 // There are potential race conditions during exception cache updates, so we
428 // must own the ExceptionCache_lock before doing ANY modifications. Because
429 // we don't lock during reads, it is possible to have several threads attempt
430 // to update the cache with the same data. We need to check for already inserted
431 // copies of the current data before adding it.
433 MutexLocker ml(ExceptionCache_lock);
434 ExceptionCache* target_entry = exception_cache_entry_for_exception(exception);
436 if (target_entry == NULL || !target_entry->add_address_and_handler(pc,handler)) {
437 target_entry = new ExceptionCache(exception,pc,handler);
438 add_exception_cache_entry(target_entry);
439 }
440 }
443 //-------------end of code for ExceptionCache--------------
446 int nmethod::total_size() const {
447 return
448 consts_size() +
449 insts_size() +
450 stub_size() +
451 scopes_data_size() +
452 scopes_pcs_size() +
453 handler_table_size() +
454 nul_chk_table_size();
455 }
457 const char* nmethod::compile_kind() const {
458 if (is_osr_method()) return "osr";
459 if (method() != NULL && is_native_method()) return "c2n";
460 return NULL;
461 }
463 // Fill in default values for various flag fields
464 void nmethod::init_defaults() {
465 _state = in_use;
466 _marked_for_reclamation = 0;
467 _has_flushed_dependencies = 0;
468 _has_unsafe_access = 0;
469 _has_method_handle_invokes = 0;
470 _lazy_critical_native = 0;
471 _has_wide_vectors = 0;
472 _marked_for_deoptimization = 0;
473 _lock_count = 0;
474 _stack_traversal_mark = 0;
475 _unload_reported = false; // jvmti state
477 #ifdef ASSERT
478 _oops_are_stale = false;
479 #endif
481 _oops_do_mark_link = NULL;
482 _jmethod_id = NULL;
483 _osr_link = NULL;
484 _scavenge_root_link = NULL;
485 _scavenge_root_state = 0;
486 _compiler = NULL;
487 #if INCLUDE_RTM_OPT
488 _rtm_state = NoRTM;
489 #endif
490 #ifdef HAVE_DTRACE_H
491 _trap_offset = 0;
492 #endif // def HAVE_DTRACE_H
493 }
495 nmethod* nmethod::new_native_nmethod(methodHandle method,
496 int compile_id,
497 CodeBuffer *code_buffer,
498 int vep_offset,
499 int frame_complete,
500 int frame_size,
501 ByteSize basic_lock_owner_sp_offset,
502 ByteSize basic_lock_sp_offset,
503 OopMapSet* oop_maps) {
504 code_buffer->finalize_oop_references(method);
505 // create nmethod
506 nmethod* nm = NULL;
507 {
508 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
509 int native_nmethod_size = allocation_size(code_buffer, sizeof(nmethod));
510 CodeOffsets offsets;
511 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
512 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
513 nm = new (native_nmethod_size) nmethod(method(), native_nmethod_size,
514 compile_id, &offsets,
515 code_buffer, frame_size,
516 basic_lock_owner_sp_offset,
517 basic_lock_sp_offset, oop_maps);
518 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_native_nmethod(nm));
519 if (PrintAssembly && nm != NULL) {
520 Disassembler::decode(nm);
521 }
522 }
523 // verify nmethod
524 debug_only(if (nm) nm->verify();) // might block
526 if (nm != NULL) {
527 nm->log_new_nmethod();
528 }
530 return nm;
531 }
533 #ifdef HAVE_DTRACE_H
534 nmethod* nmethod::new_dtrace_nmethod(methodHandle method,
535 CodeBuffer *code_buffer,
536 int vep_offset,
537 int trap_offset,
538 int frame_complete,
539 int frame_size) {
540 code_buffer->finalize_oop_references(method);
541 // create nmethod
542 nmethod* nm = NULL;
543 {
544 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
545 int nmethod_size = allocation_size(code_buffer, sizeof(nmethod));
546 CodeOffsets offsets;
547 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
548 offsets.set_value(CodeOffsets::Dtrace_trap, trap_offset);
549 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
551 nm = new (nmethod_size) nmethod(method(), nmethod_size,
552 &offsets, code_buffer, frame_size);
554 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_nmethod(nm));
555 if (PrintAssembly && nm != NULL) {
556 Disassembler::decode(nm);
557 }
558 }
559 // verify nmethod
560 debug_only(if (nm) nm->verify();) // might block
562 if (nm != NULL) {
563 nm->log_new_nmethod();
564 }
566 return nm;
567 }
569 #endif // def HAVE_DTRACE_H
571 nmethod* nmethod::new_nmethod(methodHandle method,
572 int compile_id,
573 int entry_bci,
574 CodeOffsets* offsets,
575 int orig_pc_offset,
576 DebugInformationRecorder* debug_info,
577 Dependencies* dependencies,
578 CodeBuffer* code_buffer, int frame_size,
579 OopMapSet* oop_maps,
580 ExceptionHandlerTable* handler_table,
581 ImplicitExceptionTable* nul_chk_table,
582 AbstractCompiler* compiler,
583 int comp_level
584 )
585 {
586 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
587 code_buffer->finalize_oop_references(method);
588 // create nmethod
589 nmethod* nm = NULL;
590 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
591 int nmethod_size =
592 allocation_size(code_buffer, sizeof(nmethod))
593 + adjust_pcs_size(debug_info->pcs_size())
594 + round_to(dependencies->size_in_bytes() , oopSize)
595 + round_to(handler_table->size_in_bytes(), oopSize)
596 + round_to(nul_chk_table->size_in_bytes(), oopSize)
597 + round_to(debug_info->data_size() , oopSize);
599 nm = new (nmethod_size)
600 nmethod(method(), nmethod_size, compile_id, entry_bci, offsets,
601 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size,
602 oop_maps,
603 handler_table,
604 nul_chk_table,
605 compiler,
606 comp_level);
608 if (nm != NULL) {
609 // To make dependency checking during class loading fast, record
610 // the nmethod dependencies in the classes it is dependent on.
611 // This allows the dependency checking code to simply walk the
612 // class hierarchy above the loaded class, checking only nmethods
613 // which are dependent on those classes. The slow way is to
614 // check every nmethod for dependencies which makes it linear in
615 // the number of methods compiled. For applications with a lot
616 // classes the slow way is too slow.
617 for (Dependencies::DepStream deps(nm); deps.next(); ) {
618 Klass* klass = deps.context_type();
619 if (klass == NULL) {
620 continue; // ignore things like evol_method
621 }
623 // record this nmethod as dependent on this klass
624 InstanceKlass::cast(klass)->add_dependent_nmethod(nm);
625 }
626 NOT_PRODUCT(nmethod_stats.note_nmethod(nm));
627 if (PrintAssembly || CompilerOracle::has_option_string(method, "PrintAssembly")) {
628 Disassembler::decode(nm);
629 }
630 }
631 }
632 // Do verification and logging outside CodeCache_lock.
633 if (nm != NULL) {
634 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
635 DEBUG_ONLY(nm->verify();)
636 nm->log_new_nmethod();
637 }
638 return nm;
639 }
642 // For native wrappers
643 nmethod::nmethod(
644 Method* method,
645 int nmethod_size,
646 int compile_id,
647 CodeOffsets* offsets,
648 CodeBuffer* code_buffer,
649 int frame_size,
650 ByteSize basic_lock_owner_sp_offset,
651 ByteSize basic_lock_sp_offset,
652 OopMapSet* oop_maps )
653 : CodeBlob("native nmethod", code_buffer, sizeof(nmethod),
654 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps),
655 _native_receiver_sp_offset(basic_lock_owner_sp_offset),
656 _native_basic_lock_sp_offset(basic_lock_sp_offset)
657 {
658 {
659 debug_only(No_Safepoint_Verifier nsv;)
660 assert_locked_or_safepoint(CodeCache_lock);
662 init_defaults();
663 _method = method;
664 _entry_bci = InvocationEntryBci;
665 // We have no exception handler or deopt handler make the
666 // values something that will never match a pc like the nmethod vtable entry
667 _exception_offset = 0;
668 _deoptimize_offset = 0;
669 _deoptimize_mh_offset = 0;
670 _orig_pc_offset = 0;
672 _consts_offset = data_offset();
673 _stub_offset = data_offset();
674 _oops_offset = data_offset();
675 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize);
676 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize);
677 _scopes_pcs_offset = _scopes_data_offset;
678 _dependencies_offset = _scopes_pcs_offset;
679 _handler_table_offset = _dependencies_offset;
680 _nul_chk_table_offset = _handler_table_offset;
681 _nmethod_end_offset = _nul_chk_table_offset;
682 _compile_id = compile_id;
683 _comp_level = CompLevel_none;
684 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
685 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
686 _osr_entry_point = NULL;
687 _exception_cache = NULL;
688 _pc_desc_cache.reset_to(NULL);
689 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
691 code_buffer->copy_values_to(this);
692 if (ScavengeRootsInCode) {
693 if (detect_scavenge_root_oops()) {
694 CodeCache::add_scavenge_root_nmethod(this);
695 }
696 Universe::heap()->register_nmethod(this);
697 }
698 debug_only(verify_scavenge_root_oops());
699 CodeCache::commit(this);
700 }
702 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
703 ttyLocker ttyl; // keep the following output all in one block
704 // This output goes directly to the tty, not the compiler log.
705 // To enable tools to match it up with the compilation activity,
706 // be sure to tag this tty output with the compile ID.
707 if (xtty != NULL) {
708 xtty->begin_head("print_native_nmethod");
709 xtty->method(_method);
710 xtty->stamp();
711 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
712 }
713 // print the header part first
714 print();
715 // then print the requested information
716 if (PrintNativeNMethods) {
717 print_code();
718 if (oop_maps != NULL) {
719 oop_maps->print();
720 }
721 }
722 if (PrintRelocations) {
723 print_relocations();
724 }
725 if (xtty != NULL) {
726 xtty->tail("print_native_nmethod");
727 }
728 }
729 }
731 // For dtrace wrappers
732 #ifdef HAVE_DTRACE_H
733 nmethod::nmethod(
734 Method* method,
735 int nmethod_size,
736 CodeOffsets* offsets,
737 CodeBuffer* code_buffer,
738 int frame_size)
739 : CodeBlob("dtrace nmethod", code_buffer, sizeof(nmethod),
740 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, NULL),
741 _native_receiver_sp_offset(in_ByteSize(-1)),
742 _native_basic_lock_sp_offset(in_ByteSize(-1))
743 {
744 {
745 debug_only(No_Safepoint_Verifier nsv;)
746 assert_locked_or_safepoint(CodeCache_lock);
748 init_defaults();
749 _method = method;
750 _entry_bci = InvocationEntryBci;
751 // We have no exception handler or deopt handler make the
752 // values something that will never match a pc like the nmethod vtable entry
753 _exception_offset = 0;
754 _deoptimize_offset = 0;
755 _deoptimize_mh_offset = 0;
756 _unwind_handler_offset = -1;
757 _trap_offset = offsets->value(CodeOffsets::Dtrace_trap);
758 _orig_pc_offset = 0;
759 _consts_offset = data_offset();
760 _stub_offset = data_offset();
761 _oops_offset = data_offset();
762 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize);
763 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize);
764 _scopes_pcs_offset = _scopes_data_offset;
765 _dependencies_offset = _scopes_pcs_offset;
766 _handler_table_offset = _dependencies_offset;
767 _nul_chk_table_offset = _handler_table_offset;
768 _nmethod_end_offset = _nul_chk_table_offset;
769 _compile_id = 0; // default
770 _comp_level = CompLevel_none;
771 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
772 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
773 _osr_entry_point = NULL;
774 _exception_cache = NULL;
775 _pc_desc_cache.reset_to(NULL);
776 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
778 code_buffer->copy_values_to(this);
779 if (ScavengeRootsInCode) {
780 if (detect_scavenge_root_oops()) {
781 CodeCache::add_scavenge_root_nmethod(this);
782 }
783 Universe::heap()->register_nmethod(this);
784 }
785 DEBUG_ONLY(verify_scavenge_root_oops();)
786 CodeCache::commit(this);
787 }
789 if (PrintNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
790 ttyLocker ttyl; // keep the following output all in one block
791 // This output goes directly to the tty, not the compiler log.
792 // To enable tools to match it up with the compilation activity,
793 // be sure to tag this tty output with the compile ID.
794 if (xtty != NULL) {
795 xtty->begin_head("print_dtrace_nmethod");
796 xtty->method(_method);
797 xtty->stamp();
798 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
799 }
800 // print the header part first
801 print();
802 // then print the requested information
803 if (PrintNMethods) {
804 print_code();
805 }
806 if (PrintRelocations) {
807 print_relocations();
808 }
809 if (xtty != NULL) {
810 xtty->tail("print_dtrace_nmethod");
811 }
812 }
813 }
814 #endif // def HAVE_DTRACE_H
816 void* nmethod::operator new(size_t size, int nmethod_size) throw() {
817 // Not critical, may return null if there is too little continuous memory
818 return CodeCache::allocate(nmethod_size);
819 }
821 nmethod::nmethod(
822 Method* method,
823 int nmethod_size,
824 int compile_id,
825 int entry_bci,
826 CodeOffsets* offsets,
827 int orig_pc_offset,
828 DebugInformationRecorder* debug_info,
829 Dependencies* dependencies,
830 CodeBuffer *code_buffer,
831 int frame_size,
832 OopMapSet* oop_maps,
833 ExceptionHandlerTable* handler_table,
834 ImplicitExceptionTable* nul_chk_table,
835 AbstractCompiler* compiler,
836 int comp_level
837 )
838 : CodeBlob("nmethod", code_buffer, sizeof(nmethod),
839 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps),
840 _native_receiver_sp_offset(in_ByteSize(-1)),
841 _native_basic_lock_sp_offset(in_ByteSize(-1))
842 {
843 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
844 {
845 debug_only(No_Safepoint_Verifier nsv;)
846 assert_locked_or_safepoint(CodeCache_lock);
848 init_defaults();
849 _method = method;
850 _entry_bci = entry_bci;
851 _compile_id = compile_id;
852 _comp_level = comp_level;
853 _compiler = compiler;
854 _orig_pc_offset = orig_pc_offset;
855 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
857 // Section offsets
858 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts());
859 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs());
861 // Exception handler and deopt handler are in the stub section
862 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set");
863 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set");
864 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
865 _deoptimize_offset = _stub_offset + offsets->value(CodeOffsets::Deopt);
866 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
867 _deoptimize_mh_offset = _stub_offset + offsets->value(CodeOffsets::DeoptMH);
868 } else {
869 _deoptimize_mh_offset = -1;
870 }
871 if (offsets->value(CodeOffsets::UnwindHandler) != -1) {
872 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler);
873 } else {
874 _unwind_handler_offset = -1;
875 }
877 _oops_offset = data_offset();
878 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize);
879 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize);
881 _scopes_pcs_offset = _scopes_data_offset + round_to(debug_info->data_size (), oopSize);
882 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
883 _handler_table_offset = _dependencies_offset + round_to(dependencies->size_in_bytes (), oopSize);
884 _nul_chk_table_offset = _handler_table_offset + round_to(handler_table->size_in_bytes(), oopSize);
885 _nmethod_end_offset = _nul_chk_table_offset + round_to(nul_chk_table->size_in_bytes(), oopSize);
887 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
888 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
889 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry);
890 _exception_cache = NULL;
891 _pc_desc_cache.reset_to(scopes_pcs_begin());
893 // Copy contents of ScopeDescRecorder to nmethod
894 code_buffer->copy_values_to(this);
895 debug_info->copy_to(this);
896 dependencies->copy_to(this);
897 if (ScavengeRootsInCode) {
898 if (detect_scavenge_root_oops()) {
899 CodeCache::add_scavenge_root_nmethod(this);
900 }
901 Universe::heap()->register_nmethod(this);
902 }
903 debug_only(verify_scavenge_root_oops());
905 CodeCache::commit(this);
907 // Copy contents of ExceptionHandlerTable to nmethod
908 handler_table->copy_to(this);
909 nul_chk_table->copy_to(this);
911 // we use the information of entry points to find out if a method is
912 // static or non static
913 assert(compiler->is_c2() ||
914 _method->is_static() == (entry_point() == _verified_entry_point),
915 " entry points must be same for static methods and vice versa");
916 }
918 bool printnmethods = PrintNMethods
919 || CompilerOracle::should_print(_method)
920 || CompilerOracle::has_option_string(_method, "PrintNMethods");
921 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
922 print_nmethod(printnmethods);
923 }
924 }
927 // Print a short set of xml attributes to identify this nmethod. The
928 // output should be embedded in some other element.
929 void nmethod::log_identity(xmlStream* log) const {
930 log->print(" compile_id='%d'", compile_id());
931 const char* nm_kind = compile_kind();
932 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind);
933 if (compiler() != NULL) {
934 log->print(" compiler='%s'", compiler()->name());
935 }
936 if (TieredCompilation) {
937 log->print(" level='%d'", comp_level());
938 }
939 }
942 #define LOG_OFFSET(log, name) \
943 if ((intptr_t)name##_end() - (intptr_t)name##_begin()) \
944 log->print(" " XSTR(name) "_offset='%d'" , \
945 (intptr_t)name##_begin() - (intptr_t)this)
948 void nmethod::log_new_nmethod() const {
949 if (LogCompilation && xtty != NULL) {
950 ttyLocker ttyl;
951 HandleMark hm;
952 xtty->begin_elem("nmethod");
953 log_identity(xtty);
954 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", code_begin(), size());
955 xtty->print(" address='" INTPTR_FORMAT "'", (intptr_t) this);
957 LOG_OFFSET(xtty, relocation);
958 LOG_OFFSET(xtty, consts);
959 LOG_OFFSET(xtty, insts);
960 LOG_OFFSET(xtty, stub);
961 LOG_OFFSET(xtty, scopes_data);
962 LOG_OFFSET(xtty, scopes_pcs);
963 LOG_OFFSET(xtty, dependencies);
964 LOG_OFFSET(xtty, handler_table);
965 LOG_OFFSET(xtty, nul_chk_table);
966 LOG_OFFSET(xtty, oops);
968 xtty->method(method());
969 xtty->stamp();
970 xtty->end_elem();
971 }
972 }
974 #undef LOG_OFFSET
977 // Print out more verbose output usually for a newly created nmethod.
978 void nmethod::print_on(outputStream* st, const char* msg) const {
979 if (st != NULL) {
980 ttyLocker ttyl;
981 if (WizardMode) {
982 CompileTask::print_compilation(st, this, msg, /*short_form:*/ true);
983 st->print_cr(" (" INTPTR_FORMAT ")", this);
984 } else {
985 CompileTask::print_compilation(st, this, msg, /*short_form:*/ false);
986 }
987 }
988 }
991 void nmethod::print_nmethod(bool printmethod) {
992 ttyLocker ttyl; // keep the following output all in one block
993 if (xtty != NULL) {
994 xtty->begin_head("print_nmethod");
995 xtty->stamp();
996 xtty->end_head();
997 }
998 // print the header part first
999 print();
1000 // then print the requested information
1001 if (printmethod) {
1002 print_code();
1003 print_pcs();
1004 if (oop_maps()) {
1005 oop_maps()->print();
1006 }
1007 }
1008 if (PrintDebugInfo) {
1009 print_scopes();
1010 }
1011 if (PrintRelocations) {
1012 print_relocations();
1013 }
1014 if (PrintDependencies) {
1015 print_dependencies();
1016 }
1017 if (PrintExceptionHandlers) {
1018 print_handler_table();
1019 print_nul_chk_table();
1020 }
1021 if (xtty != NULL) {
1022 xtty->tail("print_nmethod");
1023 }
1024 }
1027 // Promote one word from an assembly-time handle to a live embedded oop.
1028 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
1029 if (handle == NULL ||
1030 // As a special case, IC oops are initialized to 1 or -1.
1031 handle == (jobject) Universe::non_oop_word()) {
1032 (*dest) = (oop) handle;
1033 } else {
1034 (*dest) = JNIHandles::resolve_non_null(handle);
1035 }
1036 }
1039 // Have to have the same name because it's called by a template
1040 void nmethod::copy_values(GrowableArray<jobject>* array) {
1041 int length = array->length();
1042 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
1043 oop* dest = oops_begin();
1044 for (int index = 0 ; index < length; index++) {
1045 initialize_immediate_oop(&dest[index], array->at(index));
1046 }
1048 // Now we can fix up all the oops in the code. We need to do this
1049 // in the code because the assembler uses jobjects as placeholders.
1050 // The code and relocations have already been initialized by the
1051 // CodeBlob constructor, so it is valid even at this early point to
1052 // iterate over relocations and patch the code.
1053 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true);
1054 }
1056 void nmethod::copy_values(GrowableArray<Metadata*>* array) {
1057 int length = array->length();
1058 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough");
1059 Metadata** dest = metadata_begin();
1060 for (int index = 0 ; index < length; index++) {
1061 dest[index] = array->at(index);
1062 }
1063 }
1065 bool nmethod::is_at_poll_return(address pc) {
1066 RelocIterator iter(this, pc, pc+1);
1067 while (iter.next()) {
1068 if (iter.type() == relocInfo::poll_return_type)
1069 return true;
1070 }
1071 return false;
1072 }
1075 bool nmethod::is_at_poll_or_poll_return(address pc) {
1076 RelocIterator iter(this, pc, pc+1);
1077 while (iter.next()) {
1078 relocInfo::relocType t = iter.type();
1079 if (t == relocInfo::poll_return_type || t == relocInfo::poll_type)
1080 return true;
1081 }
1082 return false;
1083 }
1086 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) {
1087 // re-patch all oop-bearing instructions, just in case some oops moved
1088 RelocIterator iter(this, begin, end);
1089 while (iter.next()) {
1090 if (iter.type() == relocInfo::oop_type) {
1091 oop_Relocation* reloc = iter.oop_reloc();
1092 if (initialize_immediates && reloc->oop_is_immediate()) {
1093 oop* dest = reloc->oop_addr();
1094 initialize_immediate_oop(dest, (jobject) *dest);
1095 }
1096 // Refresh the oop-related bits of this instruction.
1097 reloc->fix_oop_relocation();
1098 } else if (iter.type() == relocInfo::metadata_type) {
1099 metadata_Relocation* reloc = iter.metadata_reloc();
1100 reloc->fix_metadata_relocation();
1101 }
1102 }
1103 }
1106 void nmethod::verify_oop_relocations() {
1107 // Ensure sure that the code matches the current oop values
1108 RelocIterator iter(this, NULL, NULL);
1109 while (iter.next()) {
1110 if (iter.type() == relocInfo::oop_type) {
1111 oop_Relocation* reloc = iter.oop_reloc();
1112 if (!reloc->oop_is_immediate()) {
1113 reloc->verify_oop_relocation();
1114 }
1115 }
1116 }
1117 }
1120 ScopeDesc* nmethod::scope_desc_at(address pc) {
1121 PcDesc* pd = pc_desc_at(pc);
1122 guarantee(pd != NULL, "scope must be present");
1123 return new ScopeDesc(this, pd->scope_decode_offset(),
1124 pd->obj_decode_offset(), pd->should_reexecute(),
1125 pd->return_oop());
1126 }
1129 void nmethod::clear_inline_caches() {
1130 assert(SafepointSynchronize::is_at_safepoint(), "cleaning of IC's only allowed at safepoint");
1131 if (is_zombie()) {
1132 return;
1133 }
1135 RelocIterator iter(this);
1136 while (iter.next()) {
1137 iter.reloc()->clear_inline_cache();
1138 }
1139 }
1142 void nmethod::cleanup_inline_caches() {
1144 assert_locked_or_safepoint(CompiledIC_lock);
1146 // If the method is not entrant or zombie then a JMP is plastered over the
1147 // first few bytes. If an oop in the old code was there, that oop
1148 // should not get GC'd. Skip the first few bytes of oops on
1149 // not-entrant methods.
1150 address low_boundary = verified_entry_point();
1151 if (!is_in_use()) {
1152 low_boundary += NativeJump::instruction_size;
1153 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1154 // This means that the low_boundary is going to be a little too high.
1155 // This shouldn't matter, since oops of non-entrant methods are never used.
1156 // In fact, why are we bothering to look at oops in a non-entrant method??
1157 }
1159 // Find all calls in an nmethod, and clear the ones that points to zombie methods
1160 ResourceMark rm;
1161 RelocIterator iter(this, low_boundary);
1162 while(iter.next()) {
1163 switch(iter.type()) {
1164 case relocInfo::virtual_call_type:
1165 case relocInfo::opt_virtual_call_type: {
1166 CompiledIC *ic = CompiledIC_at(iter.reloc());
1167 // Ok, to lookup references to zombies here
1168 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
1169 if( cb != NULL && cb->is_nmethod() ) {
1170 nmethod* nm = (nmethod*)cb;
1171 // Clean inline caches pointing to both zombie and not_entrant methods
1172 if (!nm->is_in_use() || (nm->method()->code() != nm)) ic->set_to_clean();
1173 }
1174 break;
1175 }
1176 case relocInfo::static_call_type: {
1177 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
1178 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
1179 if( cb != NULL && cb->is_nmethod() ) {
1180 nmethod* nm = (nmethod*)cb;
1181 // Clean inline caches pointing to both zombie and not_entrant methods
1182 if (!nm->is_in_use() || (nm->method()->code() != nm)) csc->set_to_clean();
1183 }
1184 break;
1185 }
1186 }
1187 }
1188 }
1190 // This is a private interface with the sweeper.
1191 void nmethod::mark_as_seen_on_stack() {
1192 assert(is_alive(), "Must be an alive method");
1193 // Set the traversal mark to ensure that the sweeper does 2
1194 // cleaning passes before moving to zombie.
1195 set_stack_traversal_mark(NMethodSweeper::traversal_count());
1196 }
1198 // Tell if a non-entrant method can be converted to a zombie (i.e.,
1199 // there are no activations on the stack, not in use by the VM,
1200 // and not in use by the ServiceThread)
1201 bool nmethod::can_not_entrant_be_converted() {
1202 assert(is_not_entrant(), "must be a non-entrant method");
1204 // Since the nmethod sweeper only does partial sweep the sweeper's traversal
1205 // count can be greater than the stack traversal count before it hits the
1206 // nmethod for the second time.
1207 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count() &&
1208 !is_locked_by_vm();
1209 }
1211 void nmethod::inc_decompile_count() {
1212 if (!is_compiled_by_c2()) return;
1213 // Could be gated by ProfileTraps, but do not bother...
1214 Method* m = method();
1215 if (m == NULL) return;
1216 MethodData* mdo = m->method_data();
1217 if (mdo == NULL) return;
1218 // There is a benign race here. See comments in methodData.hpp.
1219 mdo->inc_decompile_count();
1220 }
1222 void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) {
1224 post_compiled_method_unload();
1226 // Since this nmethod is being unloaded, make sure that dependencies
1227 // recorded in instanceKlasses get flushed and pass non-NULL closure to
1228 // indicate that this work is being done during a GC.
1229 assert(Universe::heap()->is_gc_active(), "should only be called during gc");
1230 assert(is_alive != NULL, "Should be non-NULL");
1231 // A non-NULL is_alive closure indicates that this is being called during GC.
1232 flush_dependencies(is_alive);
1234 // Break cycle between nmethod & method
1235 if (TraceClassUnloading && WizardMode) {
1236 tty->print_cr("[Class unloading: Making nmethod " INTPTR_FORMAT
1237 " unloadable], Method*(" INTPTR_FORMAT
1238 "), cause(" INTPTR_FORMAT ")",
1239 this, (address)_method, (address)cause);
1240 if (!Universe::heap()->is_gc_active())
1241 cause->klass()->print();
1242 }
1243 // Unlink the osr method, so we do not look this up again
1244 if (is_osr_method()) {
1245 invalidate_osr_method();
1246 }
1247 // If _method is already NULL the Method* is about to be unloaded,
1248 // so we don't have to break the cycle. Note that it is possible to
1249 // have the Method* live here, in case we unload the nmethod because
1250 // it is pointing to some oop (other than the Method*) being unloaded.
1251 if (_method != NULL) {
1252 // OSR methods point to the Method*, but the Method* does not
1253 // point back!
1254 if (_method->code() == this) {
1255 _method->clear_code(); // Break a cycle
1256 }
1257 _method = NULL; // Clear the method of this dead nmethod
1258 }
1259 // Make the class unloaded - i.e., change state and notify sweeper
1260 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
1261 if (is_in_use()) {
1262 // Transitioning directly from live to unloaded -- so
1263 // we need to force a cache clean-up; remember this
1264 // for later on.
1265 CodeCache::set_needs_cache_clean(true);
1266 }
1267 _state = unloaded;
1269 // Log the unloading.
1270 log_state_change();
1272 // The Method* is gone at this point
1273 assert(_method == NULL, "Tautology");
1275 set_osr_link(NULL);
1276 //set_scavenge_root_link(NULL); // done by prune_scavenge_root_nmethods
1277 NMethodSweeper::report_state_change(this);
1278 }
1280 void nmethod::invalidate_osr_method() {
1281 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
1282 // Remove from list of active nmethods
1283 if (method() != NULL)
1284 method()->method_holder()->remove_osr_nmethod(this);
1285 // Set entry as invalid
1286 _entry_bci = InvalidOSREntryBci;
1287 }
1289 void nmethod::log_state_change() const {
1290 if (LogCompilation) {
1291 if (xtty != NULL) {
1292 ttyLocker ttyl; // keep the following output all in one block
1293 if (_state == unloaded) {
1294 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'",
1295 os::current_thread_id());
1296 } else {
1297 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s",
1298 os::current_thread_id(),
1299 (_state == zombie ? " zombie='1'" : ""));
1300 }
1301 log_identity(xtty);
1302 xtty->stamp();
1303 xtty->end_elem();
1304 }
1305 }
1306 if (PrintCompilation && _state != unloaded) {
1307 print_on(tty, _state == zombie ? "made zombie" : "made not entrant");
1308 }
1309 }
1311 /**
1312 * Common functionality for both make_not_entrant and make_zombie
1313 */
1314 bool nmethod::make_not_entrant_or_zombie(unsigned int state) {
1315 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant");
1316 assert(!is_zombie(), "should not already be a zombie");
1318 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below.
1319 nmethodLocker nml(this);
1320 methodHandle the_method(method());
1321 No_Safepoint_Verifier nsv;
1323 // during patching, depending on the nmethod state we must notify the GC that
1324 // code has been unloaded, unregistering it. We cannot do this right while
1325 // holding the Patching_lock because we need to use the CodeCache_lock. This
1326 // would be prone to deadlocks.
1327 // This flag is used to remember whether we need to later lock and unregister.
1328 bool nmethod_needs_unregister = false;
1330 {
1331 // invalidate osr nmethod before acquiring the patching lock since
1332 // they both acquire leaf locks and we don't want a deadlock.
1333 // This logic is equivalent to the logic below for patching the
1334 // verified entry point of regular methods.
1335 if (is_osr_method()) {
1336 // this effectively makes the osr nmethod not entrant
1337 invalidate_osr_method();
1338 }
1340 // Enter critical section. Does not block for safepoint.
1341 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1343 if (_state == state) {
1344 // another thread already performed this transition so nothing
1345 // to do, but return false to indicate this.
1346 return false;
1347 }
1349 // The caller can be calling the method statically or through an inline
1350 // cache call.
1351 if (!is_osr_method() && !is_not_entrant()) {
1352 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
1353 SharedRuntime::get_handle_wrong_method_stub());
1354 }
1356 if (is_in_use()) {
1357 // It's a true state change, so mark the method as decompiled.
1358 // Do it only for transition from alive.
1359 inc_decompile_count();
1360 }
1362 // If the state is becoming a zombie, signal to unregister the nmethod with
1363 // the heap.
1364 // This nmethod may have already been unloaded during a full GC.
1365 if ((state == zombie) && !is_unloaded()) {
1366 nmethod_needs_unregister = true;
1367 }
1369 // Must happen before state change. Otherwise we have a race condition in
1370 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately
1371 // transition its state from 'not_entrant' to 'zombie' without having to wait
1372 // for stack scanning.
1373 if (state == not_entrant) {
1374 mark_as_seen_on_stack();
1375 OrderAccess::storestore();
1376 }
1378 // Change state
1379 _state = state;
1381 // Log the transition once
1382 log_state_change();
1384 // Remove nmethod from method.
1385 // We need to check if both the _code and _from_compiled_code_entry_point
1386 // refer to this nmethod because there is a race in setting these two fields
1387 // in Method* as seen in bugid 4947125.
1388 // If the vep() points to the zombie nmethod, the memory for the nmethod
1389 // could be flushed and the compiler and vtable stubs could still call
1390 // through it.
1391 if (method() != NULL && (method()->code() == this ||
1392 method()->from_compiled_entry() == verified_entry_point())) {
1393 HandleMark hm;
1394 method()->clear_code();
1395 }
1396 } // leave critical region under Patching_lock
1398 // When the nmethod becomes zombie it is no longer alive so the
1399 // dependencies must be flushed. nmethods in the not_entrant
1400 // state will be flushed later when the transition to zombie
1401 // happens or they get unloaded.
1402 if (state == zombie) {
1403 {
1404 // Flushing dependecies must be done before any possible
1405 // safepoint can sneak in, otherwise the oops used by the
1406 // dependency logic could have become stale.
1407 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1408 if (nmethod_needs_unregister) {
1409 Universe::heap()->unregister_nmethod(this);
1410 }
1411 flush_dependencies(NULL);
1412 }
1414 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload
1415 // event and it hasn't already been reported for this nmethod then
1416 // report it now. The event may have been reported earilier if the GC
1417 // marked it for unloading). JvmtiDeferredEventQueue support means
1418 // we no longer go to a safepoint here.
1419 post_compiled_method_unload();
1421 #ifdef ASSERT
1422 // It's no longer safe to access the oops section since zombie
1423 // nmethods aren't scanned for GC.
1424 _oops_are_stale = true;
1425 #endif
1426 // the Method may be reclaimed by class unloading now that the
1427 // nmethod is in zombie state
1428 set_method(NULL);
1429 } else {
1430 assert(state == not_entrant, "other cases may need to be handled differently");
1431 }
1433 if (TraceCreateZombies) {
1434 tty->print_cr("nmethod <" INTPTR_FORMAT "> code made %s", this, (state == not_entrant) ? "not entrant" : "zombie");
1435 }
1437 NMethodSweeper::report_state_change(this);
1438 return true;
1439 }
1441 void nmethod::flush() {
1442 // Note that there are no valid oops in the nmethod anymore.
1443 assert(is_zombie() || (is_osr_method() && is_unloaded()), "must be a zombie method");
1444 assert(is_marked_for_reclamation() || (is_osr_method() && is_unloaded()), "must be marked for reclamation");
1446 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed");
1447 assert_locked_or_safepoint(CodeCache_lock);
1449 // completely deallocate this method
1450 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, this);
1451 if (PrintMethodFlushing) {
1452 tty->print_cr("*flushing nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT "/Free CodeCache:" SIZE_FORMAT "Kb",
1453 _compile_id, this, CodeCache::nof_blobs(), CodeCache::unallocated_capacity()/1024);
1454 }
1456 // We need to deallocate any ExceptionCache data.
1457 // Note that we do not need to grab the nmethod lock for this, it
1458 // better be thread safe if we're disposing of it!
1459 ExceptionCache* ec = exception_cache();
1460 set_exception_cache(NULL);
1461 while(ec != NULL) {
1462 ExceptionCache* next = ec->next();
1463 delete ec;
1464 ec = next;
1465 }
1467 if (on_scavenge_root_list()) {
1468 CodeCache::drop_scavenge_root_nmethod(this);
1469 }
1471 #ifdef SHARK
1472 ((SharkCompiler *) compiler())->free_compiled_method(insts_begin());
1473 #endif // SHARK
1475 ((CodeBlob*)(this))->flush();
1477 CodeCache::free(this);
1478 }
1481 //
1482 // Notify all classes this nmethod is dependent on that it is no
1483 // longer dependent. This should only be called in two situations.
1484 // First, when a nmethod transitions to a zombie all dependents need
1485 // to be clear. Since zombification happens at a safepoint there's no
1486 // synchronization issues. The second place is a little more tricky.
1487 // During phase 1 of mark sweep class unloading may happen and as a
1488 // result some nmethods may get unloaded. In this case the flushing
1489 // of dependencies must happen during phase 1 since after GC any
1490 // dependencies in the unloaded nmethod won't be updated, so
1491 // traversing the dependency information in unsafe. In that case this
1492 // function is called with a non-NULL argument and this function only
1493 // notifies instanceKlasses that are reachable
1495 void nmethod::flush_dependencies(BoolObjectClosure* is_alive) {
1496 assert_locked_or_safepoint(CodeCache_lock);
1497 assert(Universe::heap()->is_gc_active() == (is_alive != NULL),
1498 "is_alive is non-NULL if and only if we are called during GC");
1499 if (!has_flushed_dependencies()) {
1500 set_has_flushed_dependencies();
1501 for (Dependencies::DepStream deps(this); deps.next(); ) {
1502 Klass* klass = deps.context_type();
1503 if (klass == NULL) continue; // ignore things like evol_method
1505 // During GC the is_alive closure is non-NULL, and is used to
1506 // determine liveness of dependees that need to be updated.
1507 if (is_alive == NULL || klass->is_loader_alive(is_alive)) {
1508 InstanceKlass::cast(klass)->remove_dependent_nmethod(this);
1509 }
1510 }
1511 }
1512 }
1515 // If this oop is not live, the nmethod can be unloaded.
1516 bool nmethod::can_unload(BoolObjectClosure* is_alive, oop* root, bool unloading_occurred) {
1517 assert(root != NULL, "just checking");
1518 oop obj = *root;
1519 if (obj == NULL || is_alive->do_object_b(obj)) {
1520 return false;
1521 }
1523 // If ScavengeRootsInCode is true, an nmethod might be unloaded
1524 // simply because one of its constant oops has gone dead.
1525 // No actual classes need to be unloaded in order for this to occur.
1526 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading");
1527 make_unloaded(is_alive, obj);
1528 return true;
1529 }
1531 // ------------------------------------------------------------------
1532 // post_compiled_method_load_event
1533 // new method for install_code() path
1534 // Transfer information from compilation to jvmti
1535 void nmethod::post_compiled_method_load_event() {
1537 Method* moop = method();
1538 #ifndef USDT2
1539 HS_DTRACE_PROBE8(hotspot, compiled__method__load,
1540 moop->klass_name()->bytes(),
1541 moop->klass_name()->utf8_length(),
1542 moop->name()->bytes(),
1543 moop->name()->utf8_length(),
1544 moop->signature()->bytes(),
1545 moop->signature()->utf8_length(),
1546 insts_begin(), insts_size());
1547 #else /* USDT2 */
1548 HOTSPOT_COMPILED_METHOD_LOAD(
1549 (char *) moop->klass_name()->bytes(),
1550 moop->klass_name()->utf8_length(),
1551 (char *) moop->name()->bytes(),
1552 moop->name()->utf8_length(),
1553 (char *) moop->signature()->bytes(),
1554 moop->signature()->utf8_length(),
1555 insts_begin(), insts_size());
1556 #endif /* USDT2 */
1558 if (JvmtiExport::should_post_compiled_method_load() ||
1559 JvmtiExport::should_post_compiled_method_unload()) {
1560 get_and_cache_jmethod_id();
1561 }
1563 if (JvmtiExport::should_post_compiled_method_load()) {
1564 // Let the Service thread (which is a real Java thread) post the event
1565 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1566 JvmtiDeferredEventQueue::enqueue(
1567 JvmtiDeferredEvent::compiled_method_load_event(this));
1568 }
1569 }
1571 jmethodID nmethod::get_and_cache_jmethod_id() {
1572 if (_jmethod_id == NULL) {
1573 // Cache the jmethod_id since it can no longer be looked up once the
1574 // method itself has been marked for unloading.
1575 _jmethod_id = method()->jmethod_id();
1576 }
1577 return _jmethod_id;
1578 }
1580 void nmethod::post_compiled_method_unload() {
1581 if (unload_reported()) {
1582 // During unloading we transition to unloaded and then to zombie
1583 // and the unloading is reported during the first transition.
1584 return;
1585 }
1587 assert(_method != NULL && !is_unloaded(), "just checking");
1588 DTRACE_METHOD_UNLOAD_PROBE(method());
1590 // If a JVMTI agent has enabled the CompiledMethodUnload event then
1591 // post the event. Sometime later this nmethod will be made a zombie
1592 // by the sweeper but the Method* will not be valid at that point.
1593 // If the _jmethod_id is null then no load event was ever requested
1594 // so don't bother posting the unload. The main reason for this is
1595 // that the jmethodID is a weak reference to the Method* so if
1596 // it's being unloaded there's no way to look it up since the weak
1597 // ref will have been cleared.
1598 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) {
1599 assert(!unload_reported(), "already unloaded");
1600 JvmtiDeferredEvent event =
1601 JvmtiDeferredEvent::compiled_method_unload_event(this,
1602 _jmethod_id, insts_begin());
1603 if (SafepointSynchronize::is_at_safepoint()) {
1604 // Don't want to take the queueing lock. Add it as pending and
1605 // it will get enqueued later.
1606 JvmtiDeferredEventQueue::add_pending_event(event);
1607 } else {
1608 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1609 JvmtiDeferredEventQueue::enqueue(event);
1610 }
1611 }
1613 // The JVMTI CompiledMethodUnload event can be enabled or disabled at
1614 // any time. As the nmethod is being unloaded now we mark it has
1615 // having the unload event reported - this will ensure that we don't
1616 // attempt to report the event in the unlikely scenario where the
1617 // event is enabled at the time the nmethod is made a zombie.
1618 set_unload_reported();
1619 }
1621 // This is called at the end of the strong tracing/marking phase of a
1622 // GC to unload an nmethod if it contains otherwise unreachable
1623 // oops.
1625 void nmethod::do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred) {
1626 // Make sure the oop's ready to receive visitors
1627 assert(!is_zombie() && !is_unloaded(),
1628 "should not call follow on zombie or unloaded nmethod");
1630 // If the method is not entrant then a JMP is plastered over the
1631 // first few bytes. If an oop in the old code was there, that oop
1632 // should not get GC'd. Skip the first few bytes of oops on
1633 // not-entrant methods.
1634 address low_boundary = verified_entry_point();
1635 if (is_not_entrant()) {
1636 low_boundary += NativeJump::instruction_size;
1637 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1638 // (See comment above.)
1639 }
1641 // The RedefineClasses() API can cause the class unloading invariant
1642 // to no longer be true. See jvmtiExport.hpp for details.
1643 // Also, leave a debugging breadcrumb in local flag.
1644 bool a_class_was_redefined = JvmtiExport::has_redefined_a_class();
1645 if (a_class_was_redefined) {
1646 // This set of the unloading_occurred flag is done before the
1647 // call to post_compiled_method_unload() so that the unloading
1648 // of this nmethod is reported.
1649 unloading_occurred = true;
1650 }
1652 // Exception cache
1653 ExceptionCache* ec = exception_cache();
1654 while (ec != NULL) {
1655 Klass* ex_klass = ec->exception_type();
1656 ExceptionCache* next_ec = ec->next();
1657 if (ex_klass != NULL && !ex_klass->is_loader_alive(is_alive)) {
1658 remove_from_exception_cache(ec);
1659 }
1660 ec = next_ec;
1661 }
1663 // If class unloading occurred we first iterate over all inline caches and
1664 // clear ICs where the cached oop is referring to an unloaded klass or method.
1665 // The remaining live cached oops will be traversed in the relocInfo::oop_type
1666 // iteration below.
1667 if (unloading_occurred) {
1668 RelocIterator iter(this, low_boundary);
1669 while(iter.next()) {
1670 if (iter.type() == relocInfo::virtual_call_type) {
1671 CompiledIC *ic = CompiledIC_at(iter.reloc());
1672 if (ic->is_icholder_call()) {
1673 // The only exception is compiledICHolder oops which may
1674 // yet be marked below. (We check this further below).
1675 CompiledICHolder* cichk_oop = ic->cached_icholder();
1676 if (cichk_oop->holder_method()->method_holder()->is_loader_alive(is_alive) &&
1677 cichk_oop->holder_klass()->is_loader_alive(is_alive)) {
1678 continue;
1679 }
1680 } else {
1681 Metadata* ic_oop = ic->cached_metadata();
1682 if (ic_oop != NULL) {
1683 if (ic_oop->is_klass()) {
1684 if (((Klass*)ic_oop)->is_loader_alive(is_alive)) {
1685 continue;
1686 }
1687 } else if (ic_oop->is_method()) {
1688 if (((Method*)ic_oop)->method_holder()->is_loader_alive(is_alive)) {
1689 continue;
1690 }
1691 } else {
1692 ShouldNotReachHere();
1693 }
1694 }
1695 }
1696 ic->set_to_clean();
1697 }
1698 }
1699 }
1701 // Compiled code
1702 {
1703 RelocIterator iter(this, low_boundary);
1704 while (iter.next()) {
1705 if (iter.type() == relocInfo::oop_type) {
1706 oop_Relocation* r = iter.oop_reloc();
1707 // In this loop, we must only traverse those oops directly embedded in
1708 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1709 assert(1 == (r->oop_is_immediate()) +
1710 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1711 "oop must be found in exactly one place");
1712 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1713 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) {
1714 return;
1715 }
1716 }
1717 }
1718 }
1719 }
1722 // Scopes
1723 for (oop* p = oops_begin(); p < oops_end(); p++) {
1724 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1725 if (can_unload(is_alive, p, unloading_occurred)) {
1726 return;
1727 }
1728 }
1730 // Ensure that all metadata is still alive
1731 verify_metadata_loaders(low_boundary, is_alive);
1732 }
1734 #ifdef ASSERT
1736 class CheckClass : AllStatic {
1737 static BoolObjectClosure* _is_alive;
1739 // Check class_loader is alive for this bit of metadata.
1740 static void check_class(Metadata* md) {
1741 Klass* klass = NULL;
1742 if (md->is_klass()) {
1743 klass = ((Klass*)md);
1744 } else if (md->is_method()) {
1745 klass = ((Method*)md)->method_holder();
1746 } else if (md->is_methodData()) {
1747 klass = ((MethodData*)md)->method()->method_holder();
1748 } else {
1749 md->print();
1750 ShouldNotReachHere();
1751 }
1752 assert(klass->is_loader_alive(_is_alive), "must be alive");
1753 }
1754 public:
1755 static void do_check_class(BoolObjectClosure* is_alive, nmethod* nm) {
1756 assert(SafepointSynchronize::is_at_safepoint(), "this is only ok at safepoint");
1757 _is_alive = is_alive;
1758 nm->metadata_do(check_class);
1759 }
1760 };
1762 // This is called during a safepoint so can use static data
1763 BoolObjectClosure* CheckClass::_is_alive = NULL;
1764 #endif // ASSERT
1767 // Processing of oop references should have been sufficient to keep
1768 // all strong references alive. Any weak references should have been
1769 // cleared as well. Visit all the metadata and ensure that it's
1770 // really alive.
1771 void nmethod::verify_metadata_loaders(address low_boundary, BoolObjectClosure* is_alive) {
1772 #ifdef ASSERT
1773 RelocIterator iter(this, low_boundary);
1774 while (iter.next()) {
1775 // static_stub_Relocations may have dangling references to
1776 // Method*s so trim them out here. Otherwise it looks like
1777 // compiled code is maintaining a link to dead metadata.
1778 address static_call_addr = NULL;
1779 if (iter.type() == relocInfo::opt_virtual_call_type) {
1780 CompiledIC* cic = CompiledIC_at(iter.reloc());
1781 if (!cic->is_call_to_interpreted()) {
1782 static_call_addr = iter.addr();
1783 }
1784 } else if (iter.type() == relocInfo::static_call_type) {
1785 CompiledStaticCall* csc = compiledStaticCall_at(iter.reloc());
1786 if (!csc->is_call_to_interpreted()) {
1787 static_call_addr = iter.addr();
1788 }
1789 }
1790 if (static_call_addr != NULL) {
1791 RelocIterator sciter(this, low_boundary);
1792 while (sciter.next()) {
1793 if (sciter.type() == relocInfo::static_stub_type &&
1794 sciter.static_stub_reloc()->static_call() == static_call_addr) {
1795 sciter.static_stub_reloc()->clear_inline_cache();
1796 }
1797 }
1798 }
1799 }
1800 // Check that the metadata embedded in the nmethod is alive
1801 CheckClass::do_check_class(is_alive, this);
1802 #endif
1803 }
1806 // Iterate over metadata calling this function. Used by RedefineClasses
1807 void nmethod::metadata_do(void f(Metadata*)) {
1808 address low_boundary = verified_entry_point();
1809 if (is_not_entrant()) {
1810 low_boundary += NativeJump::instruction_size;
1811 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1812 // (See comment above.)
1813 }
1814 {
1815 // Visit all immediate references that are embedded in the instruction stream.
1816 RelocIterator iter(this, low_boundary);
1817 while (iter.next()) {
1818 if (iter.type() == relocInfo::metadata_type ) {
1819 metadata_Relocation* r = iter.metadata_reloc();
1820 // In this lmetadata, we must only follow those metadatas directly embedded in
1821 // the code. Other metadatas (oop_index>0) are seen as part of
1822 // the metadata section below.
1823 assert(1 == (r->metadata_is_immediate()) +
1824 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
1825 "metadata must be found in exactly one place");
1826 if (r->metadata_is_immediate() && r->metadata_value() != NULL) {
1827 Metadata* md = r->metadata_value();
1828 f(md);
1829 }
1830 } else if (iter.type() == relocInfo::virtual_call_type) {
1831 // Check compiledIC holders associated with this nmethod
1832 CompiledIC *ic = CompiledIC_at(iter.reloc());
1833 if (ic->is_icholder_call()) {
1834 CompiledICHolder* cichk = ic->cached_icholder();
1835 f(cichk->holder_method());
1836 f(cichk->holder_klass());
1837 } else {
1838 Metadata* ic_oop = ic->cached_metadata();
1839 if (ic_oop != NULL) {
1840 f(ic_oop);
1841 }
1842 }
1843 }
1844 }
1845 }
1847 // Visit the metadata section
1848 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
1849 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops
1850 Metadata* md = *p;
1851 f(md);
1852 }
1854 // Call function Method*, not embedded in these other places.
1855 if (_method != NULL) f(_method);
1856 }
1858 void nmethod::oops_do(OopClosure* f, bool allow_zombie) {
1859 // make sure the oops ready to receive visitors
1860 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod");
1861 assert(!is_unloaded(), "should not call follow on unloaded nmethod");
1863 // If the method is not entrant or zombie then a JMP is plastered over the
1864 // first few bytes. If an oop in the old code was there, that oop
1865 // should not get GC'd. Skip the first few bytes of oops on
1866 // not-entrant methods.
1867 address low_boundary = verified_entry_point();
1868 if (is_not_entrant()) {
1869 low_boundary += NativeJump::instruction_size;
1870 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1871 // (See comment above.)
1872 }
1874 RelocIterator iter(this, low_boundary);
1876 while (iter.next()) {
1877 if (iter.type() == relocInfo::oop_type ) {
1878 oop_Relocation* r = iter.oop_reloc();
1879 // In this loop, we must only follow those oops directly embedded in
1880 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1881 assert(1 == (r->oop_is_immediate()) +
1882 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1883 "oop must be found in exactly one place");
1884 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1885 f->do_oop(r->oop_addr());
1886 }
1887 }
1888 }
1890 // Scopes
1891 // This includes oop constants not inlined in the code stream.
1892 for (oop* p = oops_begin(); p < oops_end(); p++) {
1893 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1894 f->do_oop(p);
1895 }
1896 }
1898 #define NMETHOD_SENTINEL ((nmethod*)badAddress)
1900 nmethod* volatile nmethod::_oops_do_mark_nmethods;
1902 // An nmethod is "marked" if its _mark_link is set non-null.
1903 // Even if it is the end of the linked list, it will have a non-null link value,
1904 // as long as it is on the list.
1905 // This code must be MP safe, because it is used from parallel GC passes.
1906 bool nmethod::test_set_oops_do_mark() {
1907 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");
1908 nmethod* observed_mark_link = _oops_do_mark_link;
1909 if (observed_mark_link == NULL) {
1910 // Claim this nmethod for this thread to mark.
1911 observed_mark_link = (nmethod*)
1912 Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_link, NULL);
1913 if (observed_mark_link == NULL) {
1915 // Atomically append this nmethod (now claimed) to the head of the list:
1916 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods;
1917 for (;;) {
1918 nmethod* required_mark_nmethods = observed_mark_nmethods;
1919 _oops_do_mark_link = required_mark_nmethods;
1920 observed_mark_nmethods = (nmethod*)
1921 Atomic::cmpxchg_ptr(this, &_oops_do_mark_nmethods, required_mark_nmethods);
1922 if (observed_mark_nmethods == required_mark_nmethods)
1923 break;
1924 }
1925 // Mark was clear when we first saw this guy.
1926 NOT_PRODUCT(if (TraceScavenge) print_on(tty, "oops_do, mark"));
1927 return false;
1928 }
1929 }
1930 // On fall through, another racing thread marked this nmethod before we did.
1931 return true;
1932 }
1934 void nmethod::oops_do_marking_prologue() {
1935 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("[oops_do_marking_prologue"));
1936 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row");
1937 // We use cmpxchg_ptr instead of regular assignment here because the user
1938 // may fork a bunch of threads, and we need them all to see the same state.
1939 void* observed = Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, NULL);
1940 guarantee(observed == NULL, "no races in this sequential code");
1941 }
1943 void nmethod::oops_do_marking_epilogue() {
1944 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row");
1945 nmethod* cur = _oops_do_mark_nmethods;
1946 while (cur != NMETHOD_SENTINEL) {
1947 assert(cur != NULL, "not NULL-terminated");
1948 nmethod* next = cur->_oops_do_mark_link;
1949 cur->_oops_do_mark_link = NULL;
1950 cur->fix_oop_relocations();
1951 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark"));
1952 cur = next;
1953 }
1954 void* required = _oops_do_mark_nmethods;
1955 void* observed = Atomic::cmpxchg_ptr(NULL, &_oops_do_mark_nmethods, required);
1956 guarantee(observed == required, "no races in this sequential code");
1957 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("oops_do_marking_epilogue]"));
1958 }
1960 class DetectScavengeRoot: public OopClosure {
1961 bool _detected_scavenge_root;
1962 public:
1963 DetectScavengeRoot() : _detected_scavenge_root(false)
1964 { NOT_PRODUCT(_print_nm = NULL); }
1965 bool detected_scavenge_root() { return _detected_scavenge_root; }
1966 virtual void do_oop(oop* p) {
1967 if ((*p) != NULL && (*p)->is_scavengable()) {
1968 NOT_PRODUCT(maybe_print(p));
1969 _detected_scavenge_root = true;
1970 }
1971 }
1972 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
1974 #ifndef PRODUCT
1975 nmethod* _print_nm;
1976 void maybe_print(oop* p) {
1977 if (_print_nm == NULL) return;
1978 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root");
1979 tty->print_cr(""PTR_FORMAT"[offset=%d] detected scavengable oop "PTR_FORMAT" (found at "PTR_FORMAT")",
1980 _print_nm, (int)((intptr_t)p - (intptr_t)_print_nm),
1981 (void *)(*p), (intptr_t)p);
1982 (*p)->print();
1983 }
1984 #endif //PRODUCT
1985 };
1987 bool nmethod::detect_scavenge_root_oops() {
1988 DetectScavengeRoot detect_scavenge_root;
1989 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this);
1990 oops_do(&detect_scavenge_root);
1991 return detect_scavenge_root.detected_scavenge_root();
1992 }
1994 // Method that knows how to preserve outgoing arguments at call. This method must be
1995 // called with a frame corresponding to a Java invoke
1996 void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) {
1997 #ifndef SHARK
1998 if (!method()->is_native()) {
1999 SimpleScopeDesc ssd(this, fr.pc());
2000 Bytecode_invoke call(ssd.method(), ssd.bci());
2001 bool has_receiver = call.has_receiver();
2002 bool has_appendix = call.has_appendix();
2003 Symbol* signature = call.signature();
2004 fr.oops_compiled_arguments_do(signature, has_receiver, has_appendix, reg_map, f);
2005 }
2006 #endif // !SHARK
2007 }
2010 oop nmethod::embeddedOop_at(u_char* p) {
2011 RelocIterator iter(this, p, p + 1);
2012 while (iter.next())
2013 if (iter.type() == relocInfo::oop_type) {
2014 return iter.oop_reloc()->oop_value();
2015 }
2016 return NULL;
2017 }
2020 inline bool includes(void* p, void* from, void* to) {
2021 return from <= p && p < to;
2022 }
2025 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
2026 assert(count >= 2, "must be sentinel values, at least");
2028 #ifdef ASSERT
2029 // must be sorted and unique; we do a binary search in find_pc_desc()
2030 int prev_offset = pcs[0].pc_offset();
2031 assert(prev_offset == PcDesc::lower_offset_limit,
2032 "must start with a sentinel");
2033 for (int i = 1; i < count; i++) {
2034 int this_offset = pcs[i].pc_offset();
2035 assert(this_offset > prev_offset, "offsets must be sorted");
2036 prev_offset = this_offset;
2037 }
2038 assert(prev_offset == PcDesc::upper_offset_limit,
2039 "must end with a sentinel");
2040 #endif //ASSERT
2042 // Search for MethodHandle invokes and tag the nmethod.
2043 for (int i = 0; i < count; i++) {
2044 if (pcs[i].is_method_handle_invoke()) {
2045 set_has_method_handle_invokes(true);
2046 break;
2047 }
2048 }
2049 assert(has_method_handle_invokes() == (_deoptimize_mh_offset != -1), "must have deopt mh handler");
2051 int size = count * sizeof(PcDesc);
2052 assert(scopes_pcs_size() >= size, "oob");
2053 memcpy(scopes_pcs_begin(), pcs, size);
2055 // Adjust the final sentinel downward.
2056 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
2057 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
2058 last_pc->set_pc_offset(content_size() + 1);
2059 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
2060 // Fill any rounding gaps with copies of the last record.
2061 last_pc[1] = last_pc[0];
2062 }
2063 // The following assert could fail if sizeof(PcDesc) is not
2064 // an integral multiple of oopSize (the rounding term).
2065 // If it fails, change the logic to always allocate a multiple
2066 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
2067 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
2068 }
2070 void nmethod::copy_scopes_data(u_char* buffer, int size) {
2071 assert(scopes_data_size() >= size, "oob");
2072 memcpy(scopes_data_begin(), buffer, size);
2073 }
2076 #ifdef ASSERT
2077 static PcDesc* linear_search(nmethod* nm, int pc_offset, bool approximate) {
2078 PcDesc* lower = nm->scopes_pcs_begin();
2079 PcDesc* upper = nm->scopes_pcs_end();
2080 lower += 1; // exclude initial sentinel
2081 PcDesc* res = NULL;
2082 for (PcDesc* p = lower; p < upper; p++) {
2083 NOT_PRODUCT(--nmethod_stats.pc_desc_tests); // don't count this call to match_desc
2084 if (match_desc(p, pc_offset, approximate)) {
2085 if (res == NULL)
2086 res = p;
2087 else
2088 res = (PcDesc*) badAddress;
2089 }
2090 }
2091 return res;
2092 }
2093 #endif
2096 // Finds a PcDesc with real-pc equal to "pc"
2097 PcDesc* nmethod::find_pc_desc_internal(address pc, bool approximate) {
2098 address base_address = code_begin();
2099 if ((pc < base_address) ||
2100 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
2101 return NULL; // PC is wildly out of range
2102 }
2103 int pc_offset = (int) (pc - base_address);
2105 // Check the PcDesc cache if it contains the desired PcDesc
2106 // (This as an almost 100% hit rate.)
2107 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
2108 if (res != NULL) {
2109 assert(res == linear_search(this, pc_offset, approximate), "cache ok");
2110 return res;
2111 }
2113 // Fallback algorithm: quasi-linear search for the PcDesc
2114 // Find the last pc_offset less than the given offset.
2115 // The successor must be the required match, if there is a match at all.
2116 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
2117 PcDesc* lower = scopes_pcs_begin();
2118 PcDesc* upper = scopes_pcs_end();
2119 upper -= 1; // exclude final sentinel
2120 if (lower >= upper) return NULL; // native method; no PcDescs at all
2122 #define assert_LU_OK \
2123 /* invariant on lower..upper during the following search: */ \
2124 assert(lower->pc_offset() < pc_offset, "sanity"); \
2125 assert(upper->pc_offset() >= pc_offset, "sanity")
2126 assert_LU_OK;
2128 // Use the last successful return as a split point.
2129 PcDesc* mid = _pc_desc_cache.last_pc_desc();
2130 NOT_PRODUCT(++nmethod_stats.pc_desc_searches);
2131 if (mid->pc_offset() < pc_offset) {
2132 lower = mid;
2133 } else {
2134 upper = mid;
2135 }
2137 // Take giant steps at first (4096, then 256, then 16, then 1)
2138 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
2139 const int RADIX = (1 << LOG2_RADIX);
2140 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
2141 while ((mid = lower + step) < upper) {
2142 assert_LU_OK;
2143 NOT_PRODUCT(++nmethod_stats.pc_desc_searches);
2144 if (mid->pc_offset() < pc_offset) {
2145 lower = mid;
2146 } else {
2147 upper = mid;
2148 break;
2149 }
2150 }
2151 assert_LU_OK;
2152 }
2154 // Sneak up on the value with a linear search of length ~16.
2155 while (true) {
2156 assert_LU_OK;
2157 mid = lower + 1;
2158 NOT_PRODUCT(++nmethod_stats.pc_desc_searches);
2159 if (mid->pc_offset() < pc_offset) {
2160 lower = mid;
2161 } else {
2162 upper = mid;
2163 break;
2164 }
2165 }
2166 #undef assert_LU_OK
2168 if (match_desc(upper, pc_offset, approximate)) {
2169 assert(upper == linear_search(this, pc_offset, approximate), "search ok");
2170 _pc_desc_cache.add_pc_desc(upper);
2171 return upper;
2172 } else {
2173 assert(NULL == linear_search(this, pc_offset, approximate), "search ok");
2174 return NULL;
2175 }
2176 }
2179 bool nmethod::check_all_dependencies() {
2180 bool found_check = false;
2181 // wholesale check of all dependencies
2182 for (Dependencies::DepStream deps(this); deps.next(); ) {
2183 if (deps.check_dependency() != NULL) {
2184 found_check = true;
2185 NOT_DEBUG(break);
2186 }
2187 }
2188 return found_check; // tell caller if we found anything
2189 }
2191 bool nmethod::check_dependency_on(DepChange& changes) {
2192 // What has happened:
2193 // 1) a new class dependee has been added
2194 // 2) dependee and all its super classes have been marked
2195 bool found_check = false; // set true if we are upset
2196 for (Dependencies::DepStream deps(this); deps.next(); ) {
2197 // Evaluate only relevant dependencies.
2198 if (deps.spot_check_dependency_at(changes) != NULL) {
2199 found_check = true;
2200 NOT_DEBUG(break);
2201 }
2202 }
2203 return found_check;
2204 }
2206 bool nmethod::is_evol_dependent_on(Klass* dependee) {
2207 InstanceKlass *dependee_ik = InstanceKlass::cast(dependee);
2208 Array<Method*>* dependee_methods = dependee_ik->methods();
2209 for (Dependencies::DepStream deps(this); deps.next(); ) {
2210 if (deps.type() == Dependencies::evol_method) {
2211 Method* method = deps.method_argument(0);
2212 for (int j = 0; j < dependee_methods->length(); j++) {
2213 if (dependee_methods->at(j) == method) {
2214 // RC_TRACE macro has an embedded ResourceMark
2215 RC_TRACE(0x01000000,
2216 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)",
2217 _method->method_holder()->external_name(),
2218 _method->name()->as_C_string(),
2219 _method->signature()->as_C_string(), compile_id(),
2220 method->method_holder()->external_name(),
2221 method->name()->as_C_string(),
2222 method->signature()->as_C_string()));
2223 if (TraceDependencies || LogCompilation)
2224 deps.log_dependency(dependee);
2225 return true;
2226 }
2227 }
2228 }
2229 }
2230 return false;
2231 }
2233 // Called from mark_for_deoptimization, when dependee is invalidated.
2234 bool nmethod::is_dependent_on_method(Method* dependee) {
2235 for (Dependencies::DepStream deps(this); deps.next(); ) {
2236 if (deps.type() != Dependencies::evol_method)
2237 continue;
2238 Method* method = deps.method_argument(0);
2239 if (method == dependee) return true;
2240 }
2241 return false;
2242 }
2245 bool nmethod::is_patchable_at(address instr_addr) {
2246 assert(insts_contains(instr_addr), "wrong nmethod used");
2247 if (is_zombie()) {
2248 // a zombie may never be patched
2249 return false;
2250 }
2251 return true;
2252 }
2255 address nmethod::continuation_for_implicit_exception(address pc) {
2256 // Exception happened outside inline-cache check code => we are inside
2257 // an active nmethod => use cpc to determine a return address
2258 int exception_offset = pc - code_begin();
2259 int cont_offset = ImplicitExceptionTable(this).at( exception_offset );
2260 #ifdef ASSERT
2261 if (cont_offset == 0) {
2262 Thread* thread = ThreadLocalStorage::get_thread_slow();
2263 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
2264 HandleMark hm(thread);
2265 ResourceMark rm(thread);
2266 CodeBlob* cb = CodeCache::find_blob(pc);
2267 assert(cb != NULL && cb == this, "");
2268 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, pc);
2269 print();
2270 method()->print_codes();
2271 print_code();
2272 print_pcs();
2273 }
2274 #endif
2275 if (cont_offset == 0) {
2276 // Let the normal error handling report the exception
2277 return NULL;
2278 }
2279 return code_begin() + cont_offset;
2280 }
2284 void nmethod_init() {
2285 // make sure you didn't forget to adjust the filler fields
2286 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
2287 }
2290 //-------------------------------------------------------------------------------------------
2293 // QQQ might we make this work from a frame??
2294 nmethodLocker::nmethodLocker(address pc) {
2295 CodeBlob* cb = CodeCache::find_blob(pc);
2296 guarantee(cb != NULL && cb->is_nmethod(), "bad pc for a nmethod found");
2297 _nm = (nmethod*)cb;
2298 lock_nmethod(_nm);
2299 }
2301 // Only JvmtiDeferredEvent::compiled_method_unload_event()
2302 // should pass zombie_ok == true.
2303 void nmethodLocker::lock_nmethod(nmethod* nm, bool zombie_ok) {
2304 if (nm == NULL) return;
2305 Atomic::inc(&nm->_lock_count);
2306 guarantee(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method");
2307 }
2309 void nmethodLocker::unlock_nmethod(nmethod* nm) {
2310 if (nm == NULL) return;
2311 Atomic::dec(&nm->_lock_count);
2312 guarantee(nm->_lock_count >= 0, "unmatched nmethod lock/unlock");
2313 }
2316 // -----------------------------------------------------------------------------
2317 // nmethod::get_deopt_original_pc
2318 //
2319 // Return the original PC for the given PC if:
2320 // (a) the given PC belongs to a nmethod and
2321 // (b) it is a deopt PC
2322 address nmethod::get_deopt_original_pc(const frame* fr) {
2323 if (fr->cb() == NULL) return NULL;
2325 nmethod* nm = fr->cb()->as_nmethod_or_null();
2326 if (nm != NULL && nm->is_deopt_pc(fr->pc()))
2327 return nm->get_original_pc(fr);
2329 return NULL;
2330 }
2333 // -----------------------------------------------------------------------------
2334 // MethodHandle
2336 bool nmethod::is_method_handle_return(address return_pc) {
2337 if (!has_method_handle_invokes()) return false;
2338 PcDesc* pd = pc_desc_at(return_pc);
2339 if (pd == NULL)
2340 return false;
2341 return pd->is_method_handle_invoke();
2342 }
2345 // -----------------------------------------------------------------------------
2346 // Verification
2348 class VerifyOopsClosure: public OopClosure {
2349 nmethod* _nm;
2350 bool _ok;
2351 public:
2352 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
2353 bool ok() { return _ok; }
2354 virtual void do_oop(oop* p) {
2355 if ((*p) == NULL || (*p)->is_oop()) return;
2356 if (_ok) {
2357 _nm->print_nmethod(true);
2358 _ok = false;
2359 }
2360 tty->print_cr("*** non-oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)",
2361 (void *)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm));
2362 }
2363 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2364 };
2366 void nmethod::verify() {
2368 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant
2369 // seems odd.
2371 if( is_zombie() || is_not_entrant() )
2372 return;
2374 // Make sure all the entry points are correctly aligned for patching.
2375 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
2377 // assert(method()->is_oop(), "must be valid");
2379 ResourceMark rm;
2381 if (!CodeCache::contains(this)) {
2382 fatal(err_msg("nmethod at " INTPTR_FORMAT " not in zone", this));
2383 }
2385 if(is_native_method() )
2386 return;
2388 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
2389 if (nm != this) {
2390 fatal(err_msg("findNMethod did not find this nmethod (" INTPTR_FORMAT ")",
2391 this));
2392 }
2394 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2395 if (! p->verify(this)) {
2396 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", this);
2397 }
2398 }
2400 VerifyOopsClosure voc(this);
2401 oops_do(&voc);
2402 assert(voc.ok(), "embedded oops must be OK");
2403 verify_scavenge_root_oops();
2405 verify_scopes();
2406 }
2409 void nmethod::verify_interrupt_point(address call_site) {
2410 // Verify IC only when nmethod installation is finished.
2411 bool is_installed = (method()->code() == this) // nmethod is in state 'in_use' and installed
2412 || !this->is_in_use(); // nmethod is installed, but not in 'in_use' state
2413 if (is_installed) {
2414 Thread *cur = Thread::current();
2415 if (CompiledIC_lock->owner() == cur ||
2416 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) &&
2417 SafepointSynchronize::is_at_safepoint())) {
2418 CompiledIC_at(this, call_site);
2419 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
2420 } else {
2421 MutexLocker ml_verify (CompiledIC_lock);
2422 CompiledIC_at(this, call_site);
2423 }
2424 }
2426 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address());
2427 assert(pd != NULL, "PcDesc must exist");
2428 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(),
2429 pd->obj_decode_offset(), pd->should_reexecute(),
2430 pd->return_oop());
2431 !sd->is_top(); sd = sd->sender()) {
2432 sd->verify();
2433 }
2434 }
2436 void nmethod::verify_scopes() {
2437 if( !method() ) return; // Runtime stubs have no scope
2438 if (method()->is_native()) return; // Ignore stub methods.
2439 // iterate through all interrupt point
2440 // and verify the debug information is valid.
2441 RelocIterator iter((nmethod*)this);
2442 while (iter.next()) {
2443 address stub = NULL;
2444 switch (iter.type()) {
2445 case relocInfo::virtual_call_type:
2446 verify_interrupt_point(iter.addr());
2447 break;
2448 case relocInfo::opt_virtual_call_type:
2449 stub = iter.opt_virtual_call_reloc()->static_stub();
2450 verify_interrupt_point(iter.addr());
2451 break;
2452 case relocInfo::static_call_type:
2453 stub = iter.static_call_reloc()->static_stub();
2454 //verify_interrupt_point(iter.addr());
2455 break;
2456 case relocInfo::runtime_call_type:
2457 address destination = iter.reloc()->value();
2458 // Right now there is no way to find out which entries support
2459 // an interrupt point. It would be nice if we had this
2460 // information in a table.
2461 break;
2462 }
2463 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section");
2464 }
2465 }
2468 // -----------------------------------------------------------------------------
2469 // Non-product code
2470 #ifndef PRODUCT
2472 class DebugScavengeRoot: public OopClosure {
2473 nmethod* _nm;
2474 bool _ok;
2475 public:
2476 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { }
2477 bool ok() { return _ok; }
2478 virtual void do_oop(oop* p) {
2479 if ((*p) == NULL || !(*p)->is_scavengable()) return;
2480 if (_ok) {
2481 _nm->print_nmethod(true);
2482 _ok = false;
2483 }
2484 tty->print_cr("*** scavengable oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)",
2485 (void *)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm));
2486 (*p)->print();
2487 }
2488 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2489 };
2491 void nmethod::verify_scavenge_root_oops() {
2492 if (!on_scavenge_root_list()) {
2493 // Actually look inside, to verify the claim that it's clean.
2494 DebugScavengeRoot debug_scavenge_root(this);
2495 oops_do(&debug_scavenge_root);
2496 if (!debug_scavenge_root.ok())
2497 fatal("found an unadvertised bad scavengable oop in the code cache");
2498 }
2499 assert(scavenge_root_not_marked(), "");
2500 }
2502 #endif // PRODUCT
2504 // Printing operations
2506 void nmethod::print() const {
2507 ResourceMark rm;
2508 ttyLocker ttyl; // keep the following output all in one block
2510 tty->print("Compiled method ");
2512 if (is_compiled_by_c1()) {
2513 tty->print("(c1) ");
2514 } else if (is_compiled_by_c2()) {
2515 tty->print("(c2) ");
2516 } else if (is_compiled_by_shark()) {
2517 tty->print("(shark) ");
2518 } else {
2519 tty->print("(nm) ");
2520 }
2522 print_on(tty, NULL);
2524 if (WizardMode) {
2525 tty->print("((nmethod*) "INTPTR_FORMAT ") ", this);
2526 tty->print(" for method " INTPTR_FORMAT , (address)method());
2527 tty->print(" { ");
2528 if (is_in_use()) tty->print("in_use ");
2529 if (is_not_entrant()) tty->print("not_entrant ");
2530 if (is_zombie()) tty->print("zombie ");
2531 if (is_unloaded()) tty->print("unloaded ");
2532 if (on_scavenge_root_list()) tty->print("scavenge_root ");
2533 tty->print_cr("}:");
2534 }
2535 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2536 (address)this,
2537 (address)this + size(),
2538 size());
2539 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2540 relocation_begin(),
2541 relocation_end(),
2542 relocation_size());
2543 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2544 consts_begin(),
2545 consts_end(),
2546 consts_size());
2547 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2548 insts_begin(),
2549 insts_end(),
2550 insts_size());
2551 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2552 stub_begin(),
2553 stub_end(),
2554 stub_size());
2555 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2556 oops_begin(),
2557 oops_end(),
2558 oops_size());
2559 if (metadata_size () > 0) tty->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2560 metadata_begin(),
2561 metadata_end(),
2562 metadata_size());
2563 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2564 scopes_data_begin(),
2565 scopes_data_end(),
2566 scopes_data_size());
2567 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2568 scopes_pcs_begin(),
2569 scopes_pcs_end(),
2570 scopes_pcs_size());
2571 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2572 dependencies_begin(),
2573 dependencies_end(),
2574 dependencies_size());
2575 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2576 handler_table_begin(),
2577 handler_table_end(),
2578 handler_table_size());
2579 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2580 nul_chk_table_begin(),
2581 nul_chk_table_end(),
2582 nul_chk_table_size());
2583 }
2585 void nmethod::print_code() {
2586 HandleMark hm;
2587 ResourceMark m;
2588 Disassembler::decode(this);
2589 }
2592 #ifndef PRODUCT
2594 void nmethod::print_scopes() {
2595 // Find the first pc desc for all scopes in the code and print it.
2596 ResourceMark rm;
2597 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2598 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
2599 continue;
2601 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
2602 sd->print_on(tty, p);
2603 }
2604 }
2606 void nmethod::print_dependencies() {
2607 ResourceMark rm;
2608 ttyLocker ttyl; // keep the following output all in one block
2609 tty->print_cr("Dependencies:");
2610 for (Dependencies::DepStream deps(this); deps.next(); ) {
2611 deps.print_dependency();
2612 Klass* ctxk = deps.context_type();
2613 if (ctxk != NULL) {
2614 if (ctxk->oop_is_instance() && ((InstanceKlass*)ctxk)->is_dependent_nmethod(this)) {
2615 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name());
2616 }
2617 }
2618 deps.log_dependency(); // put it into the xml log also
2619 }
2620 }
2623 void nmethod::print_relocations() {
2624 ResourceMark m; // in case methods get printed via the debugger
2625 tty->print_cr("relocations:");
2626 RelocIterator iter(this);
2627 iter.print();
2628 if (UseRelocIndex) {
2629 jint* index_end = (jint*)relocation_end() - 1;
2630 jint index_size = *index_end;
2631 jint* index_start = (jint*)( (address)index_end - index_size );
2632 tty->print_cr(" index @" INTPTR_FORMAT ": index_size=%d", index_start, index_size);
2633 if (index_size > 0) {
2634 jint* ip;
2635 for (ip = index_start; ip+2 <= index_end; ip += 2)
2636 tty->print_cr(" (%d %d) addr=" INTPTR_FORMAT " @" INTPTR_FORMAT,
2637 ip[0],
2638 ip[1],
2639 header_end()+ip[0],
2640 relocation_begin()-1+ip[1]);
2641 for (; ip < index_end; ip++)
2642 tty->print_cr(" (%d ?)", ip[0]);
2643 tty->print_cr(" @" INTPTR_FORMAT ": index_size=%d", ip, *ip);
2644 ip++;
2645 tty->print_cr("reloc_end @" INTPTR_FORMAT ":", ip);
2646 }
2647 }
2648 }
2651 void nmethod::print_pcs() {
2652 ResourceMark m; // in case methods get printed via debugger
2653 tty->print_cr("pc-bytecode offsets:");
2654 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2655 p->print(this);
2656 }
2657 }
2659 #endif // PRODUCT
2661 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
2662 RelocIterator iter(this, begin, end);
2663 bool have_one = false;
2664 while (iter.next()) {
2665 have_one = true;
2666 switch (iter.type()) {
2667 case relocInfo::none: return "no_reloc";
2668 case relocInfo::oop_type: {
2669 stringStream st;
2670 oop_Relocation* r = iter.oop_reloc();
2671 oop obj = r->oop_value();
2672 st.print("oop(");
2673 if (obj == NULL) st.print("NULL");
2674 else obj->print_value_on(&st);
2675 st.print(")");
2676 return st.as_string();
2677 }
2678 case relocInfo::metadata_type: {
2679 stringStream st;
2680 metadata_Relocation* r = iter.metadata_reloc();
2681 Metadata* obj = r->metadata_value();
2682 st.print("metadata(");
2683 if (obj == NULL) st.print("NULL");
2684 else obj->print_value_on(&st);
2685 st.print(")");
2686 return st.as_string();
2687 }
2688 case relocInfo::virtual_call_type: return "virtual_call";
2689 case relocInfo::opt_virtual_call_type: return "optimized virtual_call";
2690 case relocInfo::static_call_type: return "static_call";
2691 case relocInfo::static_stub_type: return "static_stub";
2692 case relocInfo::runtime_call_type: return "runtime_call";
2693 case relocInfo::external_word_type: return "external_word";
2694 case relocInfo::internal_word_type: return "internal_word";
2695 case relocInfo::section_word_type: return "section_word";
2696 case relocInfo::poll_type: return "poll";
2697 case relocInfo::poll_return_type: return "poll_return";
2698 case relocInfo::type_mask: return "type_bit_mask";
2699 }
2700 }
2701 return have_one ? "other" : NULL;
2702 }
2704 // Return a the last scope in (begin..end]
2705 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
2706 PcDesc* p = pc_desc_near(begin+1);
2707 if (p != NULL && p->real_pc(this) <= end) {
2708 return new ScopeDesc(this, p->scope_decode_offset(),
2709 p->obj_decode_offset(), p->should_reexecute(),
2710 p->return_oop());
2711 }
2712 return NULL;
2713 }
2715 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const {
2716 if (block_begin == entry_point()) stream->print_cr("[Entry Point]");
2717 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]");
2718 if (block_begin == exception_begin()) stream->print_cr("[Exception Handler]");
2719 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]");
2720 if (block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]");
2722 if (has_method_handle_invokes())
2723 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]");
2725 if (block_begin == consts_begin()) stream->print_cr("[Constants]");
2727 if (block_begin == entry_point()) {
2728 methodHandle m = method();
2729 if (m.not_null()) {
2730 stream->print(" # ");
2731 m->print_value_on(stream);
2732 stream->cr();
2733 }
2734 if (m.not_null() && !is_osr_method()) {
2735 ResourceMark rm;
2736 int sizeargs = m->size_of_parameters();
2737 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
2738 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
2739 {
2740 int sig_index = 0;
2741 if (!m->is_static())
2742 sig_bt[sig_index++] = T_OBJECT; // 'this'
2743 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) {
2744 BasicType t = ss.type();
2745 sig_bt[sig_index++] = t;
2746 if (type2size[t] == 2) {
2747 sig_bt[sig_index++] = T_VOID;
2748 } else {
2749 assert(type2size[t] == 1, "size is 1 or 2");
2750 }
2751 }
2752 assert(sig_index == sizeargs, "");
2753 }
2754 const char* spname = "sp"; // make arch-specific?
2755 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false);
2756 int stack_slot_offset = this->frame_size() * wordSize;
2757 int tab1 = 14, tab2 = 24;
2758 int sig_index = 0;
2759 int arg_index = (m->is_static() ? 0 : -1);
2760 bool did_old_sp = false;
2761 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) {
2762 bool at_this = (arg_index == -1);
2763 bool at_old_sp = false;
2764 BasicType t = (at_this ? T_OBJECT : ss.type());
2765 assert(t == sig_bt[sig_index], "sigs in sync");
2766 if (at_this)
2767 stream->print(" # this: ");
2768 else
2769 stream->print(" # parm%d: ", arg_index);
2770 stream->move_to(tab1);
2771 VMReg fst = regs[sig_index].first();
2772 VMReg snd = regs[sig_index].second();
2773 if (fst->is_reg()) {
2774 stream->print("%s", fst->name());
2775 if (snd->is_valid()) {
2776 stream->print(":%s", snd->name());
2777 }
2778 } else if (fst->is_stack()) {
2779 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
2780 if (offset == stack_slot_offset) at_old_sp = true;
2781 stream->print("[%s+0x%x]", spname, offset);
2782 } else {
2783 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
2784 }
2785 stream->print(" ");
2786 stream->move_to(tab2);
2787 stream->print("= ");
2788 if (at_this) {
2789 m->method_holder()->print_value_on(stream);
2790 } else {
2791 bool did_name = false;
2792 if (!at_this && ss.is_object()) {
2793 Symbol* name = ss.as_symbol_or_null();
2794 if (name != NULL) {
2795 name->print_value_on(stream);
2796 did_name = true;
2797 }
2798 }
2799 if (!did_name)
2800 stream->print("%s", type2name(t));
2801 }
2802 if (at_old_sp) {
2803 stream->print(" (%s of caller)", spname);
2804 did_old_sp = true;
2805 }
2806 stream->cr();
2807 sig_index += type2size[t];
2808 arg_index += 1;
2809 if (!at_this) ss.next();
2810 }
2811 if (!did_old_sp) {
2812 stream->print(" # ");
2813 stream->move_to(tab1);
2814 stream->print("[%s+0x%x]", spname, stack_slot_offset);
2815 stream->print(" (%s of caller)", spname);
2816 stream->cr();
2817 }
2818 }
2819 }
2820 }
2822 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) {
2823 // First, find an oopmap in (begin, end].
2824 // We use the odd half-closed interval so that oop maps and scope descs
2825 // which are tied to the byte after a call are printed with the call itself.
2826 address base = code_begin();
2827 OopMapSet* oms = oop_maps();
2828 if (oms != NULL) {
2829 for (int i = 0, imax = oms->size(); i < imax; i++) {
2830 OopMap* om = oms->at(i);
2831 address pc = base + om->offset();
2832 if (pc > begin) {
2833 if (pc <= end) {
2834 st->move_to(column);
2835 st->print("; ");
2836 om->print_on(st);
2837 }
2838 break;
2839 }
2840 }
2841 }
2843 // Print any debug info present at this pc.
2844 ScopeDesc* sd = scope_desc_in(begin, end);
2845 if (sd != NULL) {
2846 st->move_to(column);
2847 if (sd->bci() == SynchronizationEntryBCI) {
2848 st->print(";*synchronization entry");
2849 } else {
2850 if (sd->method() == NULL) {
2851 st->print("method is NULL");
2852 } else if (sd->method()->is_native()) {
2853 st->print("method is native");
2854 } else {
2855 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci());
2856 st->print(";*%s", Bytecodes::name(bc));
2857 switch (bc) {
2858 case Bytecodes::_invokevirtual:
2859 case Bytecodes::_invokespecial:
2860 case Bytecodes::_invokestatic:
2861 case Bytecodes::_invokeinterface:
2862 {
2863 Bytecode_invoke invoke(sd->method(), sd->bci());
2864 st->print(" ");
2865 if (invoke.name() != NULL)
2866 invoke.name()->print_symbol_on(st);
2867 else
2868 st->print("<UNKNOWN>");
2869 break;
2870 }
2871 case Bytecodes::_getfield:
2872 case Bytecodes::_putfield:
2873 case Bytecodes::_getstatic:
2874 case Bytecodes::_putstatic:
2875 {
2876 Bytecode_field field(sd->method(), sd->bci());
2877 st->print(" ");
2878 if (field.name() != NULL)
2879 field.name()->print_symbol_on(st);
2880 else
2881 st->print("<UNKNOWN>");
2882 }
2883 }
2884 }
2885 }
2887 // Print all scopes
2888 for (;sd != NULL; sd = sd->sender()) {
2889 st->move_to(column);
2890 st->print("; -");
2891 if (sd->method() == NULL) {
2892 st->print("method is NULL");
2893 } else {
2894 sd->method()->print_short_name(st);
2895 }
2896 int lineno = sd->method()->line_number_from_bci(sd->bci());
2897 if (lineno != -1) {
2898 st->print("@%d (line %d)", sd->bci(), lineno);
2899 } else {
2900 st->print("@%d", sd->bci());
2901 }
2902 st->cr();
2903 }
2904 }
2906 // Print relocation information
2907 const char* str = reloc_string_for(begin, end);
2908 if (str != NULL) {
2909 if (sd != NULL) st->cr();
2910 st->move_to(column);
2911 st->print("; {%s}", str);
2912 }
2913 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin());
2914 if (cont_offset != 0) {
2915 st->move_to(column);
2916 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, code_begin() + cont_offset);
2917 }
2919 }
2921 #ifndef PRODUCT
2923 void nmethod::print_value_on(outputStream* st) const {
2924 st->print("nmethod");
2925 print_on(st, NULL);
2926 }
2928 void nmethod::print_calls(outputStream* st) {
2929 RelocIterator iter(this);
2930 while (iter.next()) {
2931 switch (iter.type()) {
2932 case relocInfo::virtual_call_type:
2933 case relocInfo::opt_virtual_call_type: {
2934 VerifyMutexLocker mc(CompiledIC_lock);
2935 CompiledIC_at(iter.reloc())->print();
2936 break;
2937 }
2938 case relocInfo::static_call_type:
2939 st->print_cr("Static call at " INTPTR_FORMAT, iter.reloc()->addr());
2940 compiledStaticCall_at(iter.reloc())->print();
2941 break;
2942 }
2943 }
2944 }
2946 void nmethod::print_handler_table() {
2947 ExceptionHandlerTable(this).print();
2948 }
2950 void nmethod::print_nul_chk_table() {
2951 ImplicitExceptionTable(this).print(code_begin());
2952 }
2954 void nmethod::print_statistics() {
2955 ttyLocker ttyl;
2956 if (xtty != NULL) xtty->head("statistics type='nmethod'");
2957 nmethod_stats.print_native_nmethod_stats();
2958 nmethod_stats.print_nmethod_stats();
2959 DebugInformationRecorder::print_statistics();
2960 nmethod_stats.print_pc_stats();
2961 Dependencies::print_statistics();
2962 if (xtty != NULL) xtty->tail("statistics");
2963 }
2965 #endif // PRODUCT