Thu, 05 Sep 2019 18:52:27 +0800
Merge
1 /*
2 * Copyright (c) 1997, 2017, 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 /*
26 * This file has been modified by Loongson Technology in 2015. These
27 * modifications are Copyright (c) 2015 Loongson Technology, and are made
28 * available on the same license terms set forth above.
29 */
31 #include "precompiled.hpp"
32 #include "code/codeCache.hpp"
33 #include "code/compiledIC.hpp"
34 #include "code/dependencies.hpp"
35 #include "code/nmethod.hpp"
36 #include "code/scopeDesc.hpp"
37 #include "compiler/abstractCompiler.hpp"
38 #include "compiler/compileBroker.hpp"
39 #include "compiler/compileLog.hpp"
40 #include "compiler/compilerOracle.hpp"
41 #include "compiler/disassembler.hpp"
42 #include "interpreter/bytecode.hpp"
43 #include "oops/methodData.hpp"
44 #include "prims/jvmtiRedefineClassesTrace.hpp"
45 #include "prims/jvmtiImpl.hpp"
46 #include "runtime/orderAccess.inline.hpp"
47 #include "runtime/sharedRuntime.hpp"
48 #include "runtime/sweeper.hpp"
49 #include "utilities/dtrace.hpp"
50 #include "utilities/events.hpp"
51 #include "utilities/xmlstream.hpp"
52 #ifdef SHARK
53 #include "shark/sharkCompiler.hpp"
54 #endif
56 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
58 unsigned char nmethod::_global_unloading_clock = 0;
60 #ifdef DTRACE_ENABLED
62 // Only bother with this argument setup if dtrace is available
64 #ifndef USDT2
65 HS_DTRACE_PROBE_DECL8(hotspot, compiled__method__load,
66 const char*, int, const char*, int, const char*, int, void*, size_t);
68 HS_DTRACE_PROBE_DECL6(hotspot, compiled__method__unload,
69 char*, int, char*, int, char*, int);
71 #define DTRACE_METHOD_UNLOAD_PROBE(method) \
72 { \
73 Method* m = (method); \
74 if (m != NULL) { \
75 Symbol* klass_name = m->klass_name(); \
76 Symbol* name = m->name(); \
77 Symbol* signature = m->signature(); \
78 HS_DTRACE_PROBE6(hotspot, compiled__method__unload, \
79 klass_name->bytes(), klass_name->utf8_length(), \
80 name->bytes(), name->utf8_length(), \
81 signature->bytes(), signature->utf8_length()); \
82 } \
83 }
84 #else /* USDT2 */
85 #define DTRACE_METHOD_UNLOAD_PROBE(method) \
86 { \
87 Method* m = (method); \
88 if (m != NULL) { \
89 Symbol* klass_name = m->klass_name(); \
90 Symbol* name = m->name(); \
91 Symbol* signature = m->signature(); \
92 HOTSPOT_COMPILED_METHOD_UNLOAD( \
93 (char *) klass_name->bytes(), klass_name->utf8_length(), \
94 (char *) name->bytes(), name->utf8_length(), \
95 (char *) signature->bytes(), signature->utf8_length()); \
96 } \
97 }
98 #endif /* USDT2 */
100 #else // ndef DTRACE_ENABLED
102 #define DTRACE_METHOD_UNLOAD_PROBE(method)
104 #endif
106 bool nmethod::is_compiled_by_c1() const {
107 if (compiler() == NULL) {
108 return false;
109 }
110 return compiler()->is_c1();
111 }
112 bool nmethod::is_compiled_by_c2() const {
113 if (compiler() == NULL) {
114 return false;
115 }
116 return compiler()->is_c2();
117 }
118 bool nmethod::is_compiled_by_shark() const {
119 if (compiler() == NULL) {
120 return false;
121 }
122 return compiler()->is_shark();
123 }
127 //---------------------------------------------------------------------------------
128 // NMethod statistics
129 // They are printed under various flags, including:
130 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation.
131 // (In the latter two cases, they like other stats are printed to the log only.)
133 #ifndef PRODUCT
134 // These variables are put into one block to reduce relocations
135 // and make it simpler to print from the debugger.
136 static
137 struct nmethod_stats_struct {
138 int nmethod_count;
139 int total_size;
140 int relocation_size;
141 int consts_size;
142 int insts_size;
143 int stub_size;
144 int scopes_data_size;
145 int scopes_pcs_size;
146 int dependencies_size;
147 int handler_table_size;
148 int nul_chk_table_size;
149 int oops_size;
151 void note_nmethod(nmethod* nm) {
152 nmethod_count += 1;
153 total_size += nm->size();
154 relocation_size += nm->relocation_size();
155 consts_size += nm->consts_size();
156 insts_size += nm->insts_size();
157 stub_size += nm->stub_size();
158 oops_size += nm->oops_size();
159 scopes_data_size += nm->scopes_data_size();
160 scopes_pcs_size += nm->scopes_pcs_size();
161 dependencies_size += nm->dependencies_size();
162 handler_table_size += nm->handler_table_size();
163 nul_chk_table_size += nm->nul_chk_table_size();
164 }
165 void print_nmethod_stats() {
166 if (nmethod_count == 0) return;
167 tty->print_cr("Statistics for %d bytecoded nmethods:", nmethod_count);
168 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size);
169 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size);
170 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size);
171 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size);
172 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size);
173 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size);
174 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size);
175 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size);
176 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size);
177 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size);
178 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size);
179 }
181 int native_nmethod_count;
182 int native_total_size;
183 int native_relocation_size;
184 int native_insts_size;
185 int native_oops_size;
186 void note_native_nmethod(nmethod* nm) {
187 native_nmethod_count += 1;
188 native_total_size += nm->size();
189 native_relocation_size += nm->relocation_size();
190 native_insts_size += nm->insts_size();
191 native_oops_size += nm->oops_size();
192 }
193 void print_native_nmethod_stats() {
194 if (native_nmethod_count == 0) return;
195 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count);
196 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size);
197 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size);
198 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size);
199 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size);
200 }
202 int pc_desc_resets; // number of resets (= number of caches)
203 int pc_desc_queries; // queries to nmethod::find_pc_desc
204 int pc_desc_approx; // number of those which have approximate true
205 int pc_desc_repeats; // number of _pc_descs[0] hits
206 int pc_desc_hits; // number of LRU cache hits
207 int pc_desc_tests; // total number of PcDesc examinations
208 int pc_desc_searches; // total number of quasi-binary search steps
209 int pc_desc_adds; // number of LUR cache insertions
211 void print_pc_stats() {
212 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query",
213 pc_desc_queries,
214 (double)(pc_desc_tests + pc_desc_searches)
215 / pc_desc_queries);
216 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d",
217 pc_desc_resets,
218 pc_desc_queries, pc_desc_approx,
219 pc_desc_repeats, pc_desc_hits,
220 pc_desc_tests, pc_desc_searches, pc_desc_adds);
221 }
222 } nmethod_stats;
223 #endif //PRODUCT
226 //---------------------------------------------------------------------------------
229 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) {
230 assert(pc != NULL, "Must be non null");
231 assert(exception.not_null(), "Must be non null");
232 assert(handler != NULL, "Must be non null");
234 _count = 0;
235 _exception_type = exception->klass();
236 _next = NULL;
238 add_address_and_handler(pc,handler);
239 }
242 address ExceptionCache::match(Handle exception, address pc) {
243 assert(pc != NULL,"Must be non null");
244 assert(exception.not_null(),"Must be non null");
245 if (exception->klass() == exception_type()) {
246 return (test_address(pc));
247 }
249 return NULL;
250 }
253 bool ExceptionCache::match_exception_with_space(Handle exception) {
254 assert(exception.not_null(),"Must be non null");
255 if (exception->klass() == exception_type() && count() < cache_size) {
256 return true;
257 }
258 return false;
259 }
262 address ExceptionCache::test_address(address addr) {
263 int limit = count();
264 for (int i = 0; i < limit; i++) {
265 if (pc_at(i) == addr) {
266 return handler_at(i);
267 }
268 }
269 return NULL;
270 }
273 bool ExceptionCache::add_address_and_handler(address addr, address handler) {
274 if (test_address(addr) == handler) return true;
276 int index = count();
277 if (index < cache_size) {
278 set_pc_at(index, addr);
279 set_handler_at(index, handler);
280 increment_count();
281 return true;
282 }
283 return false;
284 }
287 // private method for handling exception cache
288 // These methods are private, and used to manipulate the exception cache
289 // directly.
290 ExceptionCache* nmethod::exception_cache_entry_for_exception(Handle exception) {
291 ExceptionCache* ec = exception_cache();
292 while (ec != NULL) {
293 if (ec->match_exception_with_space(exception)) {
294 return ec;
295 }
296 ec = ec->next();
297 }
298 return NULL;
299 }
302 //-----------------------------------------------------------------------------
305 // Helper used by both find_pc_desc methods.
306 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) {
307 NOT_PRODUCT(++nmethod_stats.pc_desc_tests);
308 if (!approximate)
309 return pc->pc_offset() == pc_offset;
310 else
311 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset();
312 }
314 void PcDescCache::reset_to(PcDesc* initial_pc_desc) {
315 if (initial_pc_desc == NULL) {
316 _pc_descs[0] = NULL; // native method; no PcDescs at all
317 return;
318 }
319 NOT_PRODUCT(++nmethod_stats.pc_desc_resets);
320 // reset the cache by filling it with benign (non-null) values
321 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel");
322 for (int i = 0; i < cache_size; i++)
323 _pc_descs[i] = initial_pc_desc;
324 }
326 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) {
327 NOT_PRODUCT(++nmethod_stats.pc_desc_queries);
328 NOT_PRODUCT(if (approximate) ++nmethod_stats.pc_desc_approx);
330 // Note: one might think that caching the most recently
331 // read value separately would be a win, but one would be
332 // wrong. When many threads are updating it, the cache
333 // line it's in would bounce between caches, negating
334 // any benefit.
336 // In order to prevent race conditions do not load cache elements
337 // repeatedly, but use a local copy:
338 PcDesc* res;
340 // Step one: Check the most recently added value.
341 res = _pc_descs[0];
342 if (res == NULL) return NULL; // native method; no PcDescs at all
343 if (match_desc(res, pc_offset, approximate)) {
344 NOT_PRODUCT(++nmethod_stats.pc_desc_repeats);
345 return res;
346 }
348 // Step two: Check the rest of the LRU cache.
349 for (int i = 1; i < cache_size; ++i) {
350 res = _pc_descs[i];
351 if (res->pc_offset() < 0) break; // optimization: skip empty cache
352 if (match_desc(res, pc_offset, approximate)) {
353 NOT_PRODUCT(++nmethod_stats.pc_desc_hits);
354 return res;
355 }
356 }
358 // Report failure.
359 return NULL;
360 }
362 void PcDescCache::add_pc_desc(PcDesc* pc_desc) {
363 NOT_PRODUCT(++nmethod_stats.pc_desc_adds);
364 // Update the LRU cache by shifting pc_desc forward.
365 for (int i = 0; i < cache_size; i++) {
366 PcDesc* next = _pc_descs[i];
367 _pc_descs[i] = pc_desc;
368 pc_desc = next;
369 }
370 }
372 // adjust pcs_size so that it is a multiple of both oopSize and
373 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple
374 // of oopSize, then 2*sizeof(PcDesc) is)
375 static int adjust_pcs_size(int pcs_size) {
376 int nsize = round_to(pcs_size, oopSize);
377 if ((nsize % sizeof(PcDesc)) != 0) {
378 nsize = pcs_size + sizeof(PcDesc);
379 }
380 assert((nsize % oopSize) == 0, "correct alignment");
381 return nsize;
382 }
384 //-----------------------------------------------------------------------------
387 void nmethod::add_exception_cache_entry(ExceptionCache* new_entry) {
388 assert(ExceptionCache_lock->owned_by_self(),"Must hold the ExceptionCache_lock");
389 assert(new_entry != NULL,"Must be non null");
390 assert(new_entry->next() == NULL, "Must be null");
392 ExceptionCache *ec = exception_cache();
393 if (ec != NULL) {
394 new_entry->set_next(ec);
395 }
396 release_set_exception_cache(new_entry);
397 }
399 void nmethod::clean_exception_cache(BoolObjectClosure* is_alive) {
400 ExceptionCache* prev = NULL;
401 ExceptionCache* curr = exception_cache();
403 while (curr != NULL) {
404 ExceptionCache* next = curr->next();
406 Klass* ex_klass = curr->exception_type();
407 if (ex_klass != NULL && !ex_klass->is_loader_alive(is_alive)) {
408 if (prev == NULL) {
409 set_exception_cache(next);
410 } else {
411 prev->set_next(next);
412 }
413 delete curr;
414 // prev stays the same.
415 } else {
416 prev = curr;
417 }
419 curr = next;
420 }
421 }
423 // public method for accessing the exception cache
424 // These are the public access methods.
425 address nmethod::handler_for_exception_and_pc(Handle exception, address pc) {
426 // We never grab a lock to read the exception cache, so we may
427 // have false negatives. This is okay, as it can only happen during
428 // the first few exception lookups for a given nmethod.
429 ExceptionCache* ec = exception_cache();
430 while (ec != NULL) {
431 address ret_val;
432 if ((ret_val = ec->match(exception,pc)) != NULL) {
433 return ret_val;
434 }
435 ec = ec->next();
436 }
437 return NULL;
438 }
441 void nmethod::add_handler_for_exception_and_pc(Handle exception, address pc, address handler) {
442 // There are potential race conditions during exception cache updates, so we
443 // must own the ExceptionCache_lock before doing ANY modifications. Because
444 // we don't lock during reads, it is possible to have several threads attempt
445 // to update the cache with the same data. We need to check for already inserted
446 // copies of the current data before adding it.
448 MutexLocker ml(ExceptionCache_lock);
449 ExceptionCache* target_entry = exception_cache_entry_for_exception(exception);
451 if (target_entry == NULL || !target_entry->add_address_and_handler(pc,handler)) {
452 target_entry = new ExceptionCache(exception,pc,handler);
453 add_exception_cache_entry(target_entry);
454 }
455 }
458 //-------------end of code for ExceptionCache--------------
461 int nmethod::total_size() const {
462 return
463 consts_size() +
464 insts_size() +
465 stub_size() +
466 scopes_data_size() +
467 scopes_pcs_size() +
468 handler_table_size() +
469 nul_chk_table_size();
470 }
472 const char* nmethod::compile_kind() const {
473 if (is_osr_method()) return "osr";
474 if (method() != NULL && is_native_method()) return "c2n";
475 return NULL;
476 }
478 // Fill in default values for various flag fields
479 void nmethod::init_defaults() {
480 _state = in_use;
481 _unloading_clock = 0;
482 _marked_for_reclamation = 0;
483 _has_flushed_dependencies = 0;
484 _has_unsafe_access = 0;
485 _has_method_handle_invokes = 0;
486 _lazy_critical_native = 0;
487 _has_wide_vectors = 0;
488 _marked_for_deoptimization = 0;
489 _lock_count = 0;
490 _stack_traversal_mark = 0;
491 _unload_reported = false; // jvmti state
493 #ifdef ASSERT
494 _oops_are_stale = false;
495 #endif
497 _oops_do_mark_link = NULL;
498 _jmethod_id = NULL;
499 _osr_link = NULL;
500 if (UseG1GC) {
501 _unloading_next = NULL;
502 } else {
503 _scavenge_root_link = NULL;
504 }
505 _scavenge_root_state = 0;
506 _compiler = NULL;
507 #if INCLUDE_RTM_OPT
508 _rtm_state = NoRTM;
509 #endif
510 #ifdef HAVE_DTRACE_H
511 _trap_offset = 0;
512 #endif // def HAVE_DTRACE_H
513 }
515 nmethod* nmethod::new_native_nmethod(methodHandle method,
516 int compile_id,
517 CodeBuffer *code_buffer,
518 int vep_offset,
519 int frame_complete,
520 int frame_size,
521 ByteSize basic_lock_owner_sp_offset,
522 ByteSize basic_lock_sp_offset,
523 OopMapSet* oop_maps) {
524 code_buffer->finalize_oop_references(method);
525 // create nmethod
526 nmethod* nm = NULL;
527 {
528 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
529 int native_nmethod_size = allocation_size(code_buffer, sizeof(nmethod));
530 CodeOffsets offsets;
531 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
532 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
533 nm = new (native_nmethod_size) nmethod(method(), native_nmethod_size,
534 compile_id, &offsets,
535 code_buffer, frame_size,
536 basic_lock_owner_sp_offset,
537 basic_lock_sp_offset, oop_maps);
538 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_native_nmethod(nm));
539 if (PrintAssembly && nm != NULL) {
540 Disassembler::decode(nm);
541 }
542 }
543 // verify nmethod
544 debug_only(if (nm) nm->verify();) // might block
546 if (nm != NULL) {
547 nm->log_new_nmethod();
548 }
550 return nm;
551 }
553 #ifdef HAVE_DTRACE_H
554 nmethod* nmethod::new_dtrace_nmethod(methodHandle method,
555 CodeBuffer *code_buffer,
556 int vep_offset,
557 int trap_offset,
558 int frame_complete,
559 int frame_size) {
560 code_buffer->finalize_oop_references(method);
561 // create nmethod
562 nmethod* nm = NULL;
563 {
564 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
565 int nmethod_size = allocation_size(code_buffer, sizeof(nmethod));
566 CodeOffsets offsets;
567 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
568 offsets.set_value(CodeOffsets::Dtrace_trap, trap_offset);
569 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
571 nm = new (nmethod_size) nmethod(method(), nmethod_size,
572 &offsets, code_buffer, frame_size);
574 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_nmethod(nm));
575 if (PrintAssembly && nm != NULL) {
576 Disassembler::decode(nm);
577 }
578 }
579 // verify nmethod
580 debug_only(if (nm) nm->verify();) // might block
582 if (nm != NULL) {
583 nm->log_new_nmethod();
584 }
586 return nm;
587 }
589 #endif // def HAVE_DTRACE_H
591 nmethod* nmethod::new_nmethod(methodHandle method,
592 int compile_id,
593 int entry_bci,
594 CodeOffsets* offsets,
595 int orig_pc_offset,
596 DebugInformationRecorder* debug_info,
597 Dependencies* dependencies,
598 CodeBuffer* code_buffer, int frame_size,
599 OopMapSet* oop_maps,
600 ExceptionHandlerTable* handler_table,
601 ImplicitExceptionTable* nul_chk_table,
602 AbstractCompiler* compiler,
603 int comp_level
604 )
605 {
606 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
607 code_buffer->finalize_oop_references(method);
608 // create nmethod
609 nmethod* nm = NULL;
610 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
611 int nmethod_size =
612 allocation_size(code_buffer, sizeof(nmethod))
613 + adjust_pcs_size(debug_info->pcs_size())
614 + round_to(dependencies->size_in_bytes() , oopSize)
615 + round_to(handler_table->size_in_bytes(), oopSize)
616 + round_to(nul_chk_table->size_in_bytes(), oopSize)
617 + round_to(debug_info->data_size() , oopSize);
619 nm = new (nmethod_size)
620 nmethod(method(), nmethod_size, compile_id, entry_bci, offsets,
621 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size,
622 oop_maps,
623 handler_table,
624 nul_chk_table,
625 compiler,
626 comp_level);
628 if (nm != NULL) {
629 // To make dependency checking during class loading fast, record
630 // the nmethod dependencies in the classes it is dependent on.
631 // This allows the dependency checking code to simply walk the
632 // class hierarchy above the loaded class, checking only nmethods
633 // which are dependent on those classes. The slow way is to
634 // check every nmethod for dependencies which makes it linear in
635 // the number of methods compiled. For applications with a lot
636 // classes the slow way is too slow.
637 for (Dependencies::DepStream deps(nm); deps.next(); ) {
638 Klass* klass = deps.context_type();
639 if (klass == NULL) {
640 continue; // ignore things like evol_method
641 }
643 // record this nmethod as dependent on this klass
644 InstanceKlass::cast(klass)->add_dependent_nmethod(nm);
645 }
646 NOT_PRODUCT(nmethod_stats.note_nmethod(nm));
647 if (PrintAssembly || CompilerOracle::has_option_string(method, "PrintAssembly")) {
648 Disassembler::decode(nm);
649 }
650 }
651 }
652 // Do verification and logging outside CodeCache_lock.
653 if (nm != NULL) {
654 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
655 DEBUG_ONLY(nm->verify();)
656 nm->log_new_nmethod();
657 }
658 return nm;
659 }
662 // For native wrappers
663 nmethod::nmethod(
664 Method* method,
665 int nmethod_size,
666 int compile_id,
667 CodeOffsets* offsets,
668 CodeBuffer* code_buffer,
669 int frame_size,
670 ByteSize basic_lock_owner_sp_offset,
671 ByteSize basic_lock_sp_offset,
672 OopMapSet* oop_maps )
673 : CodeBlob("native nmethod", code_buffer, sizeof(nmethod),
674 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps),
675 _native_receiver_sp_offset(basic_lock_owner_sp_offset),
676 _native_basic_lock_sp_offset(basic_lock_sp_offset)
677 {
678 {
679 debug_only(No_Safepoint_Verifier nsv;)
680 assert_locked_or_safepoint(CodeCache_lock);
682 init_defaults();
683 _method = method;
684 _entry_bci = InvocationEntryBci;
685 // We have no exception handler or deopt handler make the
686 // values something that will never match a pc like the nmethod vtable entry
687 _exception_offset = 0;
688 _deoptimize_offset = 0;
689 _deoptimize_mh_offset = 0;
690 _orig_pc_offset = 0;
692 _consts_offset = data_offset();
693 _stub_offset = data_offset();
694 _oops_offset = data_offset();
695 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize);
696 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize);
697 _scopes_pcs_offset = _scopes_data_offset;
698 _dependencies_offset = _scopes_pcs_offset;
699 _handler_table_offset = _dependencies_offset;
700 _nul_chk_table_offset = _handler_table_offset;
701 _nmethod_end_offset = _nul_chk_table_offset;
702 _compile_id = compile_id;
703 _comp_level = CompLevel_none;
704 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
705 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
706 _osr_entry_point = NULL;
707 _exception_cache = NULL;
708 _pc_desc_cache.reset_to(NULL);
709 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
711 code_buffer->copy_values_to(this);
712 if (ScavengeRootsInCode) {
713 if (detect_scavenge_root_oops()) {
714 CodeCache::add_scavenge_root_nmethod(this);
715 }
716 Universe::heap()->register_nmethod(this);
717 }
718 debug_only(verify_scavenge_root_oops());
719 CodeCache::commit(this);
720 }
722 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
723 ttyLocker ttyl; // keep the following output all in one block
724 // This output goes directly to the tty, not the compiler log.
725 // To enable tools to match it up with the compilation activity,
726 // be sure to tag this tty output with the compile ID.
727 if (xtty != NULL) {
728 xtty->begin_head("print_native_nmethod");
729 xtty->method(_method);
730 xtty->stamp();
731 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
732 }
733 // print the header part first
734 print();
735 // then print the requested information
736 if (PrintNativeNMethods) {
737 print_code();
738 if (oop_maps != NULL) {
739 oop_maps->print();
740 }
741 }
742 if (PrintRelocations) {
743 print_relocations();
744 }
745 if (xtty != NULL) {
746 xtty->tail("print_native_nmethod");
747 }
748 }
749 }
751 // For dtrace wrappers
752 #ifdef HAVE_DTRACE_H
753 nmethod::nmethod(
754 Method* method,
755 int nmethod_size,
756 CodeOffsets* offsets,
757 CodeBuffer* code_buffer,
758 int frame_size)
759 : CodeBlob("dtrace nmethod", code_buffer, sizeof(nmethod),
760 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, NULL),
761 _native_receiver_sp_offset(in_ByteSize(-1)),
762 _native_basic_lock_sp_offset(in_ByteSize(-1))
763 {
764 {
765 debug_only(No_Safepoint_Verifier nsv;)
766 assert_locked_or_safepoint(CodeCache_lock);
768 init_defaults();
769 _method = method;
770 _entry_bci = InvocationEntryBci;
771 // We have no exception handler or deopt handler make the
772 // values something that will never match a pc like the nmethod vtable entry
773 _exception_offset = 0;
774 _deoptimize_offset = 0;
775 _deoptimize_mh_offset = 0;
776 _unwind_handler_offset = -1;
777 _trap_offset = offsets->value(CodeOffsets::Dtrace_trap);
778 _orig_pc_offset = 0;
779 _consts_offset = data_offset();
780 _stub_offset = data_offset();
781 _oops_offset = data_offset();
782 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize);
783 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize);
784 _scopes_pcs_offset = _scopes_data_offset;
785 _dependencies_offset = _scopes_pcs_offset;
786 _handler_table_offset = _dependencies_offset;
787 _nul_chk_table_offset = _handler_table_offset;
788 _nmethod_end_offset = _nul_chk_table_offset;
789 _compile_id = 0; // default
790 _comp_level = CompLevel_none;
791 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
792 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
793 _osr_entry_point = NULL;
794 _exception_cache = NULL;
795 _pc_desc_cache.reset_to(NULL);
796 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
798 code_buffer->copy_values_to(this);
799 if (ScavengeRootsInCode) {
800 if (detect_scavenge_root_oops()) {
801 CodeCache::add_scavenge_root_nmethod(this);
802 }
803 Universe::heap()->register_nmethod(this);
804 }
805 DEBUG_ONLY(verify_scavenge_root_oops();)
806 CodeCache::commit(this);
807 }
809 if (PrintNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
810 ttyLocker ttyl; // keep the following output all in one block
811 // This output goes directly to the tty, not the compiler log.
812 // To enable tools to match it up with the compilation activity,
813 // be sure to tag this tty output with the compile ID.
814 if (xtty != NULL) {
815 xtty->begin_head("print_dtrace_nmethod");
816 xtty->method(_method);
817 xtty->stamp();
818 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
819 }
820 // print the header part first
821 print();
822 // then print the requested information
823 if (PrintNMethods) {
824 print_code();
825 }
826 if (PrintRelocations) {
827 print_relocations();
828 }
829 if (xtty != NULL) {
830 xtty->tail("print_dtrace_nmethod");
831 }
832 }
833 }
834 #endif // def HAVE_DTRACE_H
836 void* nmethod::operator new(size_t size, int nmethod_size) throw() {
837 // Not critical, may return null if there is too little continuous memory
838 return CodeCache::allocate(nmethod_size);
839 }
841 nmethod::nmethod(
842 Method* method,
843 int nmethod_size,
844 int compile_id,
845 int entry_bci,
846 CodeOffsets* offsets,
847 int orig_pc_offset,
848 DebugInformationRecorder* debug_info,
849 Dependencies* dependencies,
850 CodeBuffer *code_buffer,
851 int frame_size,
852 OopMapSet* oop_maps,
853 ExceptionHandlerTable* handler_table,
854 ImplicitExceptionTable* nul_chk_table,
855 AbstractCompiler* compiler,
856 int comp_level
857 )
858 : CodeBlob("nmethod", code_buffer, sizeof(nmethod),
859 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps),
860 _native_receiver_sp_offset(in_ByteSize(-1)),
861 _native_basic_lock_sp_offset(in_ByteSize(-1))
862 {
863 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
864 {
865 debug_only(No_Safepoint_Verifier nsv;)
866 assert_locked_or_safepoint(CodeCache_lock);
868 init_defaults();
869 _method = method;
870 _entry_bci = entry_bci;
871 _compile_id = compile_id;
872 _comp_level = comp_level;
873 _compiler = compiler;
874 _orig_pc_offset = orig_pc_offset;
875 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
877 // Section offsets
878 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts());
879 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs());
881 // Exception handler and deopt handler are in the stub section
882 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set");
883 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set");
884 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
885 _deoptimize_offset = _stub_offset + offsets->value(CodeOffsets::Deopt);
886 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
887 _deoptimize_mh_offset = _stub_offset + offsets->value(CodeOffsets::DeoptMH);
888 } else {
889 _deoptimize_mh_offset = -1;
890 }
891 if (offsets->value(CodeOffsets::UnwindHandler) != -1) {
892 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler);
893 } else {
894 _unwind_handler_offset = -1;
895 }
897 _oops_offset = data_offset();
898 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize);
899 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize);
901 _scopes_pcs_offset = _scopes_data_offset + round_to(debug_info->data_size (), oopSize);
902 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
903 _handler_table_offset = _dependencies_offset + round_to(dependencies->size_in_bytes (), oopSize);
904 _nul_chk_table_offset = _handler_table_offset + round_to(handler_table->size_in_bytes(), oopSize);
905 _nmethod_end_offset = _nul_chk_table_offset + round_to(nul_chk_table->size_in_bytes(), oopSize);
907 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
908 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
909 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry);
910 _exception_cache = NULL;
911 _pc_desc_cache.reset_to(scopes_pcs_begin());
913 // Copy contents of ScopeDescRecorder to nmethod
914 code_buffer->copy_values_to(this);
915 debug_info->copy_to(this);
916 dependencies->copy_to(this);
917 if (ScavengeRootsInCode) {
918 if (detect_scavenge_root_oops()) {
919 CodeCache::add_scavenge_root_nmethod(this);
920 }
921 Universe::heap()->register_nmethod(this);
922 }
923 debug_only(verify_scavenge_root_oops());
925 CodeCache::commit(this);
927 // Copy contents of ExceptionHandlerTable to nmethod
928 handler_table->copy_to(this);
929 nul_chk_table->copy_to(this);
931 // we use the information of entry points to find out if a method is
932 // static or non static
933 assert(compiler->is_c2() ||
934 _method->is_static() == (entry_point() == _verified_entry_point),
935 " entry points must be same for static methods and vice versa");
936 }
938 bool printnmethods = PrintNMethods
939 || CompilerOracle::should_print(_method)
940 || CompilerOracle::has_option_string(_method, "PrintNMethods");
941 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
942 print_nmethod(printnmethods);
943 }
944 }
947 // Print a short set of xml attributes to identify this nmethod. The
948 // output should be embedded in some other element.
949 void nmethod::log_identity(xmlStream* log) const {
950 log->print(" compile_id='%d'", compile_id());
951 const char* nm_kind = compile_kind();
952 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind);
953 if (compiler() != NULL) {
954 log->print(" compiler='%s'", compiler()->name());
955 }
956 if (TieredCompilation) {
957 log->print(" level='%d'", comp_level());
958 }
959 }
962 #define LOG_OFFSET(log, name) \
963 if ((intptr_t)name##_end() - (intptr_t)name##_begin()) \
964 log->print(" " XSTR(name) "_offset='%d'" , \
965 (intptr_t)name##_begin() - (intptr_t)this)
968 void nmethod::log_new_nmethod() const {
969 if (LogCompilation && xtty != NULL) {
970 ttyLocker ttyl;
971 HandleMark hm;
972 xtty->begin_elem("nmethod");
973 log_identity(xtty);
974 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", code_begin(), size());
975 xtty->print(" address='" INTPTR_FORMAT "'", (intptr_t) this);
977 LOG_OFFSET(xtty, relocation);
978 LOG_OFFSET(xtty, consts);
979 LOG_OFFSET(xtty, insts);
980 LOG_OFFSET(xtty, stub);
981 LOG_OFFSET(xtty, scopes_data);
982 LOG_OFFSET(xtty, scopes_pcs);
983 LOG_OFFSET(xtty, dependencies);
984 LOG_OFFSET(xtty, handler_table);
985 LOG_OFFSET(xtty, nul_chk_table);
986 LOG_OFFSET(xtty, oops);
988 xtty->method(method());
989 xtty->stamp();
990 xtty->end_elem();
991 }
992 }
994 #undef LOG_OFFSET
997 // Print out more verbose output usually for a newly created nmethod.
998 void nmethod::print_on(outputStream* st, const char* msg) const {
999 if (st != NULL) {
1000 ttyLocker ttyl;
1001 if (WizardMode) {
1002 CompileTask::print_compilation(st, this, msg, /*short_form:*/ true);
1003 st->print_cr(" (" INTPTR_FORMAT ")", this);
1004 } else {
1005 CompileTask::print_compilation(st, this, msg, /*short_form:*/ false);
1006 }
1007 }
1008 }
1011 void nmethod::print_nmethod(bool printmethod) {
1012 ttyLocker ttyl; // keep the following output all in one block
1013 if (xtty != NULL) {
1014 xtty->begin_head("print_nmethod");
1015 xtty->stamp();
1016 xtty->end_head();
1017 }
1018 // print the header part first
1019 print();
1020 // then print the requested information
1021 if (printmethod) {
1022 print_code();
1023 print_pcs();
1024 if (oop_maps()) {
1025 oop_maps()->print();
1026 }
1027 }
1028 if (PrintDebugInfo) {
1029 print_scopes();
1030 }
1031 if (PrintRelocations) {
1032 print_relocations();
1033 }
1034 if (PrintDependencies) {
1035 print_dependencies();
1036 }
1037 if (PrintExceptionHandlers) {
1038 print_handler_table();
1039 print_nul_chk_table();
1040 }
1041 if (xtty != NULL) {
1042 xtty->tail("print_nmethod");
1043 }
1044 }
1047 // Promote one word from an assembly-time handle to a live embedded oop.
1048 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
1049 if (handle == NULL ||
1050 // As a special case, IC oops are initialized to 1 or -1.
1051 handle == (jobject) Universe::non_oop_word()) {
1052 (*dest) = (oop) handle;
1053 } else {
1054 (*dest) = JNIHandles::resolve_non_null(handle);
1055 }
1056 }
1059 // Have to have the same name because it's called by a template
1060 void nmethod::copy_values(GrowableArray<jobject>* array) {
1061 int length = array->length();
1062 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
1063 oop* dest = oops_begin();
1064 for (int index = 0 ; index < length; index++) {
1065 initialize_immediate_oop(&dest[index], array->at(index));
1066 }
1068 // Now we can fix up all the oops in the code. We need to do this
1069 // in the code because the assembler uses jobjects as placeholders.
1070 // The code and relocations have already been initialized by the
1071 // CodeBlob constructor, so it is valid even at this early point to
1072 // iterate over relocations and patch the code.
1073 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true);
1074 }
1076 void nmethod::copy_values(GrowableArray<Metadata*>* array) {
1077 int length = array->length();
1078 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough");
1079 Metadata** dest = metadata_begin();
1080 for (int index = 0 ; index < length; index++) {
1081 dest[index] = array->at(index);
1082 }
1083 }
1085 bool nmethod::is_at_poll_return(address pc) {
1086 RelocIterator iter(this, pc, pc+1);
1087 while (iter.next()) {
1088 if (iter.type() == relocInfo::poll_return_type)
1089 return true;
1090 }
1091 return false;
1092 }
1095 bool nmethod::is_at_poll_or_poll_return(address pc) {
1096 RelocIterator iter(this, pc, pc+1);
1097 while (iter.next()) {
1098 relocInfo::relocType t = iter.type();
1099 if (t == relocInfo::poll_return_type || t == relocInfo::poll_type)
1100 return true;
1101 }
1102 return false;
1103 }
1106 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) {
1107 // re-patch all oop-bearing instructions, just in case some oops moved
1108 RelocIterator iter(this, begin, end);
1109 while (iter.next()) {
1110 if (iter.type() == relocInfo::oop_type) {
1111 oop_Relocation* reloc = iter.oop_reloc();
1112 if (initialize_immediates && reloc->oop_is_immediate()) {
1113 oop* dest = reloc->oop_addr();
1114 initialize_immediate_oop(dest, (jobject) *dest);
1115 }
1116 // Refresh the oop-related bits of this instruction.
1117 reloc->fix_oop_relocation();
1118 } else if (iter.type() == relocInfo::metadata_type) {
1119 metadata_Relocation* reloc = iter.metadata_reloc();
1120 reloc->fix_metadata_relocation();
1121 }
1122 }
1123 }
1126 void nmethod::verify_oop_relocations() {
1127 // Ensure sure that the code matches the current oop values
1128 RelocIterator iter(this, NULL, NULL);
1129 while (iter.next()) {
1130 if (iter.type() == relocInfo::oop_type) {
1131 oop_Relocation* reloc = iter.oop_reloc();
1132 if (!reloc->oop_is_immediate()) {
1133 reloc->verify_oop_relocation();
1134 }
1135 }
1136 }
1137 }
1140 ScopeDesc* nmethod::scope_desc_at(address pc) {
1141 PcDesc* pd = pc_desc_at(pc);
1142 guarantee(pd != NULL, "scope must be present");
1143 return new ScopeDesc(this, pd->scope_decode_offset(),
1144 pd->obj_decode_offset(), pd->should_reexecute(),
1145 pd->return_oop());
1146 }
1149 void nmethod::clear_inline_caches() {
1150 assert(SafepointSynchronize::is_at_safepoint(), "cleaning of IC's only allowed at safepoint");
1151 if (is_zombie()) {
1152 return;
1153 }
1155 RelocIterator iter(this);
1156 while (iter.next()) {
1157 iter.reloc()->clear_inline_cache();
1158 }
1159 }
1161 // Clear ICStubs of all compiled ICs
1162 void nmethod::clear_ic_stubs() {
1163 assert_locked_or_safepoint(CompiledIC_lock);
1164 ResourceMark rm;
1165 RelocIterator iter(this);
1166 while(iter.next()) {
1167 if (iter.type() == relocInfo::virtual_call_type) {
1168 CompiledIC* ic = CompiledIC_at(&iter);
1169 ic->clear_ic_stub();
1170 }
1171 }
1172 }
1175 void nmethod::cleanup_inline_caches() {
1176 assert_locked_or_safepoint(CompiledIC_lock);
1178 // If the method is not entrant or zombie then a JMP is plastered over the
1179 // first few bytes. If an oop in the old code was there, that oop
1180 // should not get GC'd. Skip the first few bytes of oops on
1181 // not-entrant methods.
1182 address low_boundary = verified_entry_point();
1183 if (!is_in_use()) {
1184 low_boundary += NOT_MIPS64(NativeJump)MIPS64_ONLY(NativeGeneralJump)::instruction_size;
1185 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1186 // This means that the low_boundary is going to be a little too high.
1187 // This shouldn't matter, since oops of non-entrant methods are never used.
1188 // In fact, why are we bothering to look at oops in a non-entrant method??
1189 }
1191 // Find all calls in an nmethod and clear the ones that point to non-entrant,
1192 // zombie and unloaded nmethods.
1193 ResourceMark rm;
1194 RelocIterator iter(this, low_boundary);
1195 while(iter.next()) {
1196 switch(iter.type()) {
1197 case relocInfo::virtual_call_type:
1198 case relocInfo::opt_virtual_call_type: {
1199 CompiledIC *ic = CompiledIC_at(&iter);
1200 // Ok, to lookup references to zombies here
1201 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
1202 if( cb != NULL && cb->is_nmethod() ) {
1203 nmethod* nm = (nmethod*)cb;
1204 // Clean inline caches pointing to zombie, non-entrant and unloaded methods
1205 if (!nm->is_in_use() || (nm->method()->code() != nm)) ic->set_to_clean(is_alive());
1206 }
1207 break;
1208 }
1209 case relocInfo::static_call_type: {
1210 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
1211 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
1212 if( cb != NULL && cb->is_nmethod() ) {
1213 nmethod* nm = (nmethod*)cb;
1214 // Clean inline caches pointing to zombie, non-entrant and unloaded methods
1215 if (!nm->is_in_use() || (nm->method()->code() != nm)) csc->set_to_clean();
1216 }
1217 break;
1218 }
1219 }
1220 }
1221 }
1223 void nmethod::verify_clean_inline_caches() {
1224 assert_locked_or_safepoint(CompiledIC_lock);
1226 // If the method is not entrant or zombie then a JMP is plastered over the
1227 // first few bytes. If an oop in the old code was there, that oop
1228 // should not get GC'd. Skip the first few bytes of oops on
1229 // not-entrant methods.
1230 address low_boundary = verified_entry_point();
1231 if (!is_in_use()) {
1232 low_boundary += NOT_MIPS64(NativeJump)MIPS64_ONLY(NativeGeneralJump)::instruction_size;
1233 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1234 // This means that the low_boundary is going to be a little too high.
1235 // This shouldn't matter, since oops of non-entrant methods are never used.
1236 // In fact, why are we bothering to look at oops in a non-entrant method??
1237 }
1239 ResourceMark rm;
1240 RelocIterator iter(this, low_boundary);
1241 while(iter.next()) {
1242 switch(iter.type()) {
1243 case relocInfo::virtual_call_type:
1244 case relocInfo::opt_virtual_call_type: {
1245 CompiledIC *ic = CompiledIC_at(&iter);
1246 // Ok, to lookup references to zombies here
1247 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
1248 if( cb != NULL && cb->is_nmethod() ) {
1249 nmethod* nm = (nmethod*)cb;
1250 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
1251 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1252 assert(ic->is_clean(), "IC should be clean");
1253 }
1254 }
1255 break;
1256 }
1257 case relocInfo::static_call_type: {
1258 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
1259 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
1260 if( cb != NULL && cb->is_nmethod() ) {
1261 nmethod* nm = (nmethod*)cb;
1262 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
1263 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1264 assert(csc->is_clean(), "IC should be clean");
1265 }
1266 }
1267 break;
1268 }
1269 }
1270 }
1271 }
1273 int nmethod::verify_icholder_relocations() {
1274 int count = 0;
1276 RelocIterator iter(this);
1277 while(iter.next()) {
1278 if (iter.type() == relocInfo::virtual_call_type) {
1279 if (CompiledIC::is_icholder_call_site(iter.virtual_call_reloc())) {
1280 CompiledIC *ic = CompiledIC_at(&iter);
1281 if (TraceCompiledIC) {
1282 tty->print("noticed icholder " INTPTR_FORMAT " ", p2i(ic->cached_icholder()));
1283 ic->print();
1284 }
1285 assert(ic->cached_icholder() != NULL, "must be non-NULL");
1286 count++;
1287 }
1288 }
1289 }
1291 return count;
1292 }
1294 // This is a private interface with the sweeper.
1295 void nmethod::mark_as_seen_on_stack() {
1296 assert(is_alive(), "Must be an alive method");
1297 // Set the traversal mark to ensure that the sweeper does 2
1298 // cleaning passes before moving to zombie.
1299 set_stack_traversal_mark(NMethodSweeper::traversal_count());
1300 }
1302 // Tell if a non-entrant method can be converted to a zombie (i.e.,
1303 // there are no activations on the stack, not in use by the VM,
1304 // and not in use by the ServiceThread)
1305 bool nmethod::can_convert_to_zombie() {
1306 assert(is_not_entrant(), "must be a non-entrant method");
1308 // Since the nmethod sweeper only does partial sweep the sweeper's traversal
1309 // count can be greater than the stack traversal count before it hits the
1310 // nmethod for the second time.
1311 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count() &&
1312 !is_locked_by_vm();
1313 }
1315 void nmethod::inc_decompile_count() {
1316 if (!is_compiled_by_c2()) return;
1317 // Could be gated by ProfileTraps, but do not bother...
1318 Method* m = method();
1319 if (m == NULL) return;
1320 MethodData* mdo = m->method_data();
1321 if (mdo == NULL) return;
1322 // There is a benign race here. See comments in methodData.hpp.
1323 mdo->inc_decompile_count();
1324 }
1326 void nmethod::increase_unloading_clock() {
1327 _global_unloading_clock++;
1328 if (_global_unloading_clock == 0) {
1329 // _nmethods are allocated with _unloading_clock == 0,
1330 // so 0 is never used as a clock value.
1331 _global_unloading_clock = 1;
1332 }
1333 }
1335 void nmethod::set_unloading_clock(unsigned char unloading_clock) {
1336 OrderAccess::release_store((volatile jubyte*)&_unloading_clock, unloading_clock);
1337 }
1339 unsigned char nmethod::unloading_clock() {
1340 return (unsigned char)OrderAccess::load_acquire((volatile jubyte*)&_unloading_clock);
1341 }
1343 void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) {
1345 post_compiled_method_unload();
1347 // Since this nmethod is being unloaded, make sure that dependencies
1348 // recorded in instanceKlasses get flushed and pass non-NULL closure to
1349 // indicate that this work is being done during a GC.
1350 assert(Universe::heap()->is_gc_active(), "should only be called during gc");
1351 assert(is_alive != NULL, "Should be non-NULL");
1352 // A non-NULL is_alive closure indicates that this is being called during GC.
1353 flush_dependencies(is_alive);
1355 // Break cycle between nmethod & method
1356 if (TraceClassUnloading && WizardMode) {
1357 tty->print_cr("[Class unloading: Making nmethod " INTPTR_FORMAT
1358 " unloadable], Method*(" INTPTR_FORMAT
1359 "), cause(" INTPTR_FORMAT ")",
1360 this, (address)_method, (address)cause);
1361 if (!Universe::heap()->is_gc_active())
1362 cause->klass()->print();
1363 }
1364 // Unlink the osr method, so we do not look this up again
1365 if (is_osr_method()) {
1366 invalidate_osr_method();
1367 }
1368 // If _method is already NULL the Method* is about to be unloaded,
1369 // so we don't have to break the cycle. Note that it is possible to
1370 // have the Method* live here, in case we unload the nmethod because
1371 // it is pointing to some oop (other than the Method*) being unloaded.
1372 if (_method != NULL) {
1373 // OSR methods point to the Method*, but the Method* does not
1374 // point back!
1375 if (_method->code() == this) {
1376 _method->clear_code(); // Break a cycle
1377 }
1378 _method = NULL; // Clear the method of this dead nmethod
1379 }
1380 // Make the class unloaded - i.e., change state and notify sweeper
1381 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
1382 if (is_in_use()) {
1383 // Transitioning directly from live to unloaded -- so
1384 // we need to force a cache clean-up; remember this
1385 // for later on.
1386 CodeCache::set_needs_cache_clean(true);
1387 }
1389 // Unregister must be done before the state change
1390 Universe::heap()->unregister_nmethod(this);
1392 _state = unloaded;
1394 // Log the unloading.
1395 log_state_change();
1397 // The Method* is gone at this point
1398 assert(_method == NULL, "Tautology");
1400 set_osr_link(NULL);
1401 NMethodSweeper::report_state_change(this);
1402 }
1404 void nmethod::invalidate_osr_method() {
1405 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
1406 // Remove from list of active nmethods
1407 if (method() != NULL)
1408 method()->method_holder()->remove_osr_nmethod(this);
1409 // Set entry as invalid
1410 _entry_bci = InvalidOSREntryBci;
1411 }
1413 void nmethod::log_state_change() const {
1414 if (LogCompilation) {
1415 if (xtty != NULL) {
1416 ttyLocker ttyl; // keep the following output all in one block
1417 if (_state == unloaded) {
1418 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'",
1419 os::current_thread_id());
1420 } else {
1421 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s",
1422 os::current_thread_id(),
1423 (_state == zombie ? " zombie='1'" : ""));
1424 }
1425 log_identity(xtty);
1426 xtty->stamp();
1427 xtty->end_elem();
1428 }
1429 }
1430 if (PrintCompilation && _state != unloaded) {
1431 print_on(tty, _state == zombie ? "made zombie" : "made not entrant");
1432 }
1433 }
1435 /**
1436 * Common functionality for both make_not_entrant and make_zombie
1437 */
1438 bool nmethod::make_not_entrant_or_zombie(unsigned int state) {
1439 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant");
1440 assert(!is_zombie(), "should not already be a zombie");
1442 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below.
1443 nmethodLocker nml(this);
1444 methodHandle the_method(method());
1445 No_Safepoint_Verifier nsv;
1447 // during patching, depending on the nmethod state we must notify the GC that
1448 // code has been unloaded, unregistering it. We cannot do this right while
1449 // holding the Patching_lock because we need to use the CodeCache_lock. This
1450 // would be prone to deadlocks.
1451 // This flag is used to remember whether we need to later lock and unregister.
1452 bool nmethod_needs_unregister = false;
1454 {
1455 // invalidate osr nmethod before acquiring the patching lock since
1456 // they both acquire leaf locks and we don't want a deadlock.
1457 // This logic is equivalent to the logic below for patching the
1458 // verified entry point of regular methods.
1459 if (is_osr_method()) {
1460 // this effectively makes the osr nmethod not entrant
1461 invalidate_osr_method();
1462 }
1464 // Enter critical section. Does not block for safepoint.
1465 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1467 if (_state == state) {
1468 // another thread already performed this transition so nothing
1469 // to do, but return false to indicate this.
1470 return false;
1471 }
1473 // The caller can be calling the method statically or through an inline
1474 // cache call.
1475 if (!is_osr_method() && !is_not_entrant()) {
1476 NOT_MIPS64(NativeJump)MIPS64_ONLY(NativeGeneralJump)::patch_verified_entry(entry_point(), verified_entry_point(),
1477 SharedRuntime::get_handle_wrong_method_stub());
1478 }
1480 if (is_in_use()) {
1481 // It's a true state change, so mark the method as decompiled.
1482 // Do it only for transition from alive.
1483 inc_decompile_count();
1484 }
1486 // If the state is becoming a zombie, signal to unregister the nmethod with
1487 // the heap.
1488 // This nmethod may have already been unloaded during a full GC.
1489 if ((state == zombie) && !is_unloaded()) {
1490 nmethod_needs_unregister = true;
1491 }
1493 // Must happen before state change. Otherwise we have a race condition in
1494 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately
1495 // transition its state from 'not_entrant' to 'zombie' without having to wait
1496 // for stack scanning.
1497 if (state == not_entrant) {
1498 mark_as_seen_on_stack();
1499 OrderAccess::storestore();
1500 }
1502 // Change state
1503 _state = state;
1505 // Log the transition once
1506 log_state_change();
1508 // Remove nmethod from method.
1509 // We need to check if both the _code and _from_compiled_code_entry_point
1510 // refer to this nmethod because there is a race in setting these two fields
1511 // in Method* as seen in bugid 4947125.
1512 // If the vep() points to the zombie nmethod, the memory for the nmethod
1513 // could be flushed and the compiler and vtable stubs could still call
1514 // through it.
1515 if (method() != NULL && (method()->code() == this ||
1516 method()->from_compiled_entry() == verified_entry_point())) {
1517 HandleMark hm;
1518 method()->clear_code(false /* already owns Patching_lock */);
1519 }
1520 } // leave critical region under Patching_lock
1522 // When the nmethod becomes zombie it is no longer alive so the
1523 // dependencies must be flushed. nmethods in the not_entrant
1524 // state will be flushed later when the transition to zombie
1525 // happens or they get unloaded.
1526 if (state == zombie) {
1527 {
1528 // Flushing dependecies must be done before any possible
1529 // safepoint can sneak in, otherwise the oops used by the
1530 // dependency logic could have become stale.
1531 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1532 if (nmethod_needs_unregister) {
1533 Universe::heap()->unregister_nmethod(this);
1534 }
1535 flush_dependencies(NULL);
1536 }
1538 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload
1539 // event and it hasn't already been reported for this nmethod then
1540 // report it now. The event may have been reported earilier if the GC
1541 // marked it for unloading). JvmtiDeferredEventQueue support means
1542 // we no longer go to a safepoint here.
1543 post_compiled_method_unload();
1545 #ifdef ASSERT
1546 // It's no longer safe to access the oops section since zombie
1547 // nmethods aren't scanned for GC.
1548 _oops_are_stale = true;
1549 #endif
1550 // the Method may be reclaimed by class unloading now that the
1551 // nmethod is in zombie state
1552 set_method(NULL);
1553 } else {
1554 assert(state == not_entrant, "other cases may need to be handled differently");
1555 }
1557 if (TraceCreateZombies) {
1558 tty->print_cr("nmethod <" INTPTR_FORMAT "> code made %s", this, (state == not_entrant) ? "not entrant" : "zombie");
1559 }
1561 NMethodSweeper::report_state_change(this);
1562 return true;
1563 }
1565 void nmethod::flush() {
1566 // Note that there are no valid oops in the nmethod anymore.
1567 assert(is_zombie() || (is_osr_method() && is_unloaded()), "must be a zombie method");
1568 assert(is_marked_for_reclamation() || (is_osr_method() && is_unloaded()), "must be marked for reclamation");
1570 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed");
1571 assert_locked_or_safepoint(CodeCache_lock);
1573 // completely deallocate this method
1574 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, this);
1575 if (PrintMethodFlushing) {
1576 tty->print_cr("*flushing nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT "/Free CodeCache:" SIZE_FORMAT "Kb",
1577 _compile_id, this, CodeCache::nof_blobs(), CodeCache::unallocated_capacity()/1024);
1578 }
1580 // We need to deallocate any ExceptionCache data.
1581 // Note that we do not need to grab the nmethod lock for this, it
1582 // better be thread safe if we're disposing of it!
1583 ExceptionCache* ec = exception_cache();
1584 set_exception_cache(NULL);
1585 while(ec != NULL) {
1586 ExceptionCache* next = ec->next();
1587 delete ec;
1588 ec = next;
1589 }
1591 if (on_scavenge_root_list()) {
1592 CodeCache::drop_scavenge_root_nmethod(this);
1593 }
1595 #ifdef SHARK
1596 ((SharkCompiler *) compiler())->free_compiled_method(insts_begin());
1597 #endif // SHARK
1599 ((CodeBlob*)(this))->flush();
1601 CodeCache::free(this);
1602 }
1605 //
1606 // Notify all classes this nmethod is dependent on that it is no
1607 // longer dependent. This should only be called in two situations.
1608 // First, when a nmethod transitions to a zombie all dependents need
1609 // to be clear. Since zombification happens at a safepoint there's no
1610 // synchronization issues. The second place is a little more tricky.
1611 // During phase 1 of mark sweep class unloading may happen and as a
1612 // result some nmethods may get unloaded. In this case the flushing
1613 // of dependencies must happen during phase 1 since after GC any
1614 // dependencies in the unloaded nmethod won't be updated, so
1615 // traversing the dependency information in unsafe. In that case this
1616 // function is called with a non-NULL argument and this function only
1617 // notifies instanceKlasses that are reachable
1619 void nmethod::flush_dependencies(BoolObjectClosure* is_alive) {
1620 assert_locked_or_safepoint(CodeCache_lock);
1621 assert(Universe::heap()->is_gc_active() == (is_alive != NULL),
1622 "is_alive is non-NULL if and only if we are called during GC");
1623 if (!has_flushed_dependencies()) {
1624 set_has_flushed_dependencies();
1625 for (Dependencies::DepStream deps(this); deps.next(); ) {
1626 Klass* klass = deps.context_type();
1627 if (klass == NULL) continue; // ignore things like evol_method
1629 // During GC the is_alive closure is non-NULL, and is used to
1630 // determine liveness of dependees that need to be updated.
1631 if (is_alive == NULL || klass->is_loader_alive(is_alive)) {
1632 // The GC defers deletion of this entry, since there might be multiple threads
1633 // iterating over the _dependencies graph. Other call paths are single-threaded
1634 // and may delete it immediately.
1635 bool delete_immediately = is_alive == NULL;
1636 InstanceKlass::cast(klass)->remove_dependent_nmethod(this, delete_immediately);
1637 }
1638 }
1639 }
1640 }
1643 // If this oop is not live, the nmethod can be unloaded.
1644 bool nmethod::can_unload(BoolObjectClosure* is_alive, oop* root, bool unloading_occurred) {
1645 assert(root != NULL, "just checking");
1646 oop obj = *root;
1647 if (obj == NULL || is_alive->do_object_b(obj)) {
1648 return false;
1649 }
1651 // If ScavengeRootsInCode is true, an nmethod might be unloaded
1652 // simply because one of its constant oops has gone dead.
1653 // No actual classes need to be unloaded in order for this to occur.
1654 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading");
1655 make_unloaded(is_alive, obj);
1656 return true;
1657 }
1659 // ------------------------------------------------------------------
1660 // post_compiled_method_load_event
1661 // new method for install_code() path
1662 // Transfer information from compilation to jvmti
1663 void nmethod::post_compiled_method_load_event() {
1665 Method* moop = method();
1666 #ifndef USDT2
1667 HS_DTRACE_PROBE8(hotspot, compiled__method__load,
1668 moop->klass_name()->bytes(),
1669 moop->klass_name()->utf8_length(),
1670 moop->name()->bytes(),
1671 moop->name()->utf8_length(),
1672 moop->signature()->bytes(),
1673 moop->signature()->utf8_length(),
1674 insts_begin(), insts_size());
1675 #else /* USDT2 */
1676 HOTSPOT_COMPILED_METHOD_LOAD(
1677 (char *) moop->klass_name()->bytes(),
1678 moop->klass_name()->utf8_length(),
1679 (char *) moop->name()->bytes(),
1680 moop->name()->utf8_length(),
1681 (char *) moop->signature()->bytes(),
1682 moop->signature()->utf8_length(),
1683 insts_begin(), insts_size());
1684 #endif /* USDT2 */
1686 if (JvmtiExport::should_post_compiled_method_load() ||
1687 JvmtiExport::should_post_compiled_method_unload()) {
1688 get_and_cache_jmethod_id();
1689 }
1691 if (JvmtiExport::should_post_compiled_method_load()) {
1692 // Let the Service thread (which is a real Java thread) post the event
1693 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1694 JvmtiDeferredEventQueue::enqueue(
1695 JvmtiDeferredEvent::compiled_method_load_event(this));
1696 }
1697 }
1699 jmethodID nmethod::get_and_cache_jmethod_id() {
1700 if (_jmethod_id == NULL) {
1701 // Cache the jmethod_id since it can no longer be looked up once the
1702 // method itself has been marked for unloading.
1703 _jmethod_id = method()->jmethod_id();
1704 }
1705 return _jmethod_id;
1706 }
1708 void nmethod::post_compiled_method_unload() {
1709 if (unload_reported()) {
1710 // During unloading we transition to unloaded and then to zombie
1711 // and the unloading is reported during the first transition.
1712 return;
1713 }
1715 assert(_method != NULL && !is_unloaded(), "just checking");
1716 DTRACE_METHOD_UNLOAD_PROBE(method());
1718 // If a JVMTI agent has enabled the CompiledMethodUnload event then
1719 // post the event. Sometime later this nmethod will be made a zombie
1720 // by the sweeper but the Method* will not be valid at that point.
1721 // If the _jmethod_id is null then no load event was ever requested
1722 // so don't bother posting the unload. The main reason for this is
1723 // that the jmethodID is a weak reference to the Method* so if
1724 // it's being unloaded there's no way to look it up since the weak
1725 // ref will have been cleared.
1726 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) {
1727 assert(!unload_reported(), "already unloaded");
1728 JvmtiDeferredEvent event =
1729 JvmtiDeferredEvent::compiled_method_unload_event(this,
1730 _jmethod_id, insts_begin());
1731 if (SafepointSynchronize::is_at_safepoint()) {
1732 // Don't want to take the queueing lock. Add it as pending and
1733 // it will get enqueued later.
1734 JvmtiDeferredEventQueue::add_pending_event(event);
1735 } else {
1736 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1737 JvmtiDeferredEventQueue::enqueue(event);
1738 }
1739 }
1741 // The JVMTI CompiledMethodUnload event can be enabled or disabled at
1742 // any time. As the nmethod is being unloaded now we mark it has
1743 // having the unload event reported - this will ensure that we don't
1744 // attempt to report the event in the unlikely scenario where the
1745 // event is enabled at the time the nmethod is made a zombie.
1746 set_unload_reported();
1747 }
1749 void static clean_ic_if_metadata_is_dead(CompiledIC *ic, BoolObjectClosure *is_alive, bool mark_on_stack) {
1750 if (ic->is_icholder_call()) {
1751 // The only exception is compiledICHolder oops which may
1752 // yet be marked below. (We check this further below).
1753 CompiledICHolder* cichk_oop = ic->cached_icholder();
1755 if (mark_on_stack) {
1756 Metadata::mark_on_stack(cichk_oop->holder_metadata());
1757 Metadata::mark_on_stack(cichk_oop->holder_klass());
1758 }
1760 if (cichk_oop->is_loader_alive(is_alive)) {
1761 return;
1762 }
1763 } else {
1764 Metadata* ic_oop = ic->cached_metadata();
1765 if (ic_oop != NULL) {
1766 if (mark_on_stack) {
1767 Metadata::mark_on_stack(ic_oop);
1768 }
1770 if (ic_oop->is_klass()) {
1771 if (((Klass*)ic_oop)->is_loader_alive(is_alive)) {
1772 return;
1773 }
1774 } else if (ic_oop->is_method()) {
1775 if (((Method*)ic_oop)->method_holder()->is_loader_alive(is_alive)) {
1776 return;
1777 }
1778 } else {
1779 ShouldNotReachHere();
1780 }
1781 }
1782 }
1784 ic->set_to_clean();
1785 }
1787 // This is called at the end of the strong tracing/marking phase of a
1788 // GC to unload an nmethod if it contains otherwise unreachable
1789 // oops.
1791 void nmethod::do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred) {
1792 // Make sure the oop's ready to receive visitors
1793 assert(!is_zombie() && !is_unloaded(),
1794 "should not call follow on zombie or unloaded nmethod");
1796 // If the method is not entrant then a JMP is plastered over the
1797 // first few bytes. If an oop in the old code was there, that oop
1798 // should not get GC'd. Skip the first few bytes of oops on
1799 // not-entrant methods.
1800 address low_boundary = verified_entry_point();
1801 if (is_not_entrant()) {
1802 low_boundary += NOT_MIPS64(NativeJump)MIPS64_ONLY(NativeGeneralJump)::instruction_size;
1803 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1804 // (See comment above.)
1805 }
1807 // The RedefineClasses() API can cause the class unloading invariant
1808 // to no longer be true. See jvmtiExport.hpp for details.
1809 // Also, leave a debugging breadcrumb in local flag.
1810 bool a_class_was_redefined = JvmtiExport::has_redefined_a_class();
1811 if (a_class_was_redefined) {
1812 // This set of the unloading_occurred flag is done before the
1813 // call to post_compiled_method_unload() so that the unloading
1814 // of this nmethod is reported.
1815 unloading_occurred = true;
1816 }
1818 // Exception cache
1819 clean_exception_cache(is_alive);
1821 // If class unloading occurred we first iterate over all inline caches and
1822 // clear ICs where the cached oop is referring to an unloaded klass or method.
1823 // The remaining live cached oops will be traversed in the relocInfo::oop_type
1824 // iteration below.
1825 if (unloading_occurred) {
1826 RelocIterator iter(this, low_boundary);
1827 while(iter.next()) {
1828 if (iter.type() == relocInfo::virtual_call_type) {
1829 CompiledIC *ic = CompiledIC_at(&iter);
1830 clean_ic_if_metadata_is_dead(ic, is_alive, false);
1831 }
1832 }
1833 }
1835 // Compiled code
1836 {
1837 RelocIterator iter(this, low_boundary);
1838 while (iter.next()) {
1839 if (iter.type() == relocInfo::oop_type) {
1840 oop_Relocation* r = iter.oop_reloc();
1841 // In this loop, we must only traverse those oops directly embedded in
1842 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1843 assert(1 == (r->oop_is_immediate()) +
1844 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1845 "oop must be found in exactly one place");
1846 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1847 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) {
1848 return;
1849 }
1850 }
1851 }
1852 }
1853 }
1856 // Scopes
1857 for (oop* p = oops_begin(); p < oops_end(); p++) {
1858 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1859 if (can_unload(is_alive, p, unloading_occurred)) {
1860 return;
1861 }
1862 }
1864 // Ensure that all metadata is still alive
1865 verify_metadata_loaders(low_boundary, is_alive);
1866 }
1868 template <class CompiledICorStaticCall>
1869 static bool clean_if_nmethod_is_unloaded(CompiledICorStaticCall *ic, address addr, BoolObjectClosure *is_alive, nmethod* from) {
1870 // Ok, to lookup references to zombies here
1871 CodeBlob *cb = CodeCache::find_blob_unsafe(addr);
1872 if (cb != NULL && cb->is_nmethod()) {
1873 nmethod* nm = (nmethod*)cb;
1875 if (nm->unloading_clock() != nmethod::global_unloading_clock()) {
1876 // The nmethod has not been processed yet.
1877 return true;
1878 }
1880 // Clean inline caches pointing to both zombie and not_entrant methods
1881 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1882 ic->set_to_clean();
1883 assert(ic->is_clean(), err_msg("nmethod " PTR_FORMAT "not clean %s", from, from->method()->name_and_sig_as_C_string()));
1884 }
1885 }
1887 return false;
1888 }
1890 static bool clean_if_nmethod_is_unloaded(CompiledIC *ic, BoolObjectClosure *is_alive, nmethod* from) {
1891 return clean_if_nmethod_is_unloaded(ic, ic->ic_destination(), is_alive, from);
1892 }
1894 static bool clean_if_nmethod_is_unloaded(CompiledStaticCall *csc, BoolObjectClosure *is_alive, nmethod* from) {
1895 return clean_if_nmethod_is_unloaded(csc, csc->destination(), is_alive, from);
1896 }
1898 bool nmethod::unload_if_dead_at(RelocIterator* iter_at_oop, BoolObjectClosure *is_alive, bool unloading_occurred) {
1899 assert(iter_at_oop->type() == relocInfo::oop_type, "Wrong relocation type");
1901 oop_Relocation* r = iter_at_oop->oop_reloc();
1902 // Traverse those oops directly embedded in the code.
1903 // Other oops (oop_index>0) are seen as part of scopes_oops.
1904 assert(1 == (r->oop_is_immediate()) +
1905 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1906 "oop must be found in exactly one place");
1907 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1908 // Unload this nmethod if the oop is dead.
1909 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) {
1910 return true;;
1911 }
1912 }
1914 return false;
1915 }
1917 void nmethod::mark_metadata_on_stack_at(RelocIterator* iter_at_metadata) {
1918 assert(iter_at_metadata->type() == relocInfo::metadata_type, "Wrong relocation type");
1920 metadata_Relocation* r = iter_at_metadata->metadata_reloc();
1921 // In this metadata, we must only follow those metadatas directly embedded in
1922 // the code. Other metadatas (oop_index>0) are seen as part of
1923 // the metadata section below.
1924 assert(1 == (r->metadata_is_immediate()) +
1925 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
1926 "metadata must be found in exactly one place");
1927 if (r->metadata_is_immediate() && r->metadata_value() != NULL) {
1928 Metadata* md = r->metadata_value();
1929 if (md != _method) Metadata::mark_on_stack(md);
1930 }
1931 }
1933 void nmethod::mark_metadata_on_stack_non_relocs() {
1934 // Visit the metadata section
1935 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
1936 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops
1937 Metadata* md = *p;
1938 Metadata::mark_on_stack(md);
1939 }
1941 // Visit metadata not embedded in the other places.
1942 if (_method != NULL) Metadata::mark_on_stack(_method);
1943 }
1945 bool nmethod::do_unloading_parallel(BoolObjectClosure* is_alive, bool unloading_occurred) {
1946 ResourceMark rm;
1948 // Make sure the oop's ready to receive visitors
1949 assert(!is_zombie() && !is_unloaded(),
1950 "should not call follow on zombie or unloaded nmethod");
1952 // If the method is not entrant then a JMP is plastered over the
1953 // first few bytes. If an oop in the old code was there, that oop
1954 // should not get GC'd. Skip the first few bytes of oops on
1955 // not-entrant methods.
1956 address low_boundary = verified_entry_point();
1957 if (is_not_entrant()) {
1958 low_boundary += NOT_MIPS64(NativeJump)MIPS64_ONLY(NativeGeneralJump)::instruction_size;
1959 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1960 // (See comment above.)
1961 }
1963 // The RedefineClasses() API can cause the class unloading invariant
1964 // to no longer be true. See jvmtiExport.hpp for details.
1965 // Also, leave a debugging breadcrumb in local flag.
1966 bool a_class_was_redefined = JvmtiExport::has_redefined_a_class();
1967 if (a_class_was_redefined) {
1968 // This set of the unloading_occurred flag is done before the
1969 // call to post_compiled_method_unload() so that the unloading
1970 // of this nmethod is reported.
1971 unloading_occurred = true;
1972 }
1974 // When class redefinition is used all metadata in the CodeCache has to be recorded,
1975 // so that unused "previous versions" can be purged. Since walking the CodeCache can
1976 // be expensive, the "mark on stack" is piggy-backed on this parallel unloading code.
1977 bool mark_metadata_on_stack = a_class_was_redefined;
1979 // Exception cache
1980 clean_exception_cache(is_alive);
1982 bool is_unloaded = false;
1983 bool postponed = false;
1985 RelocIterator iter(this, low_boundary);
1986 while(iter.next()) {
1988 switch (iter.type()) {
1990 case relocInfo::virtual_call_type:
1991 if (unloading_occurred) {
1992 // If class unloading occurred we first iterate over all inline caches and
1993 // clear ICs where the cached oop is referring to an unloaded klass or method.
1994 clean_ic_if_metadata_is_dead(CompiledIC_at(&iter), is_alive, mark_metadata_on_stack);
1995 }
1997 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
1998 break;
2000 case relocInfo::opt_virtual_call_type:
2001 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
2002 break;
2004 case relocInfo::static_call_type:
2005 postponed |= clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this);
2006 break;
2008 case relocInfo::oop_type:
2009 if (!is_unloaded) {
2010 is_unloaded = unload_if_dead_at(&iter, is_alive, unloading_occurred);
2011 }
2012 break;
2014 case relocInfo::metadata_type:
2015 if (mark_metadata_on_stack) {
2016 mark_metadata_on_stack_at(&iter);
2017 }
2018 }
2019 }
2021 if (mark_metadata_on_stack) {
2022 mark_metadata_on_stack_non_relocs();
2023 }
2025 if (is_unloaded) {
2026 return postponed;
2027 }
2029 // Scopes
2030 for (oop* p = oops_begin(); p < oops_end(); p++) {
2031 if (*p == Universe::non_oop_word()) continue; // skip non-oops
2032 if (can_unload(is_alive, p, unloading_occurred)) {
2033 is_unloaded = true;
2034 break;
2035 }
2036 }
2038 if (is_unloaded) {
2039 return postponed;
2040 }
2042 // Ensure that all metadata is still alive
2043 verify_metadata_loaders(low_boundary, is_alive);
2045 return postponed;
2046 }
2048 void nmethod::do_unloading_parallel_postponed(BoolObjectClosure* is_alive, bool unloading_occurred) {
2049 ResourceMark rm;
2051 // Make sure the oop's ready to receive visitors
2052 assert(!is_zombie(),
2053 "should not call follow on zombie nmethod");
2055 // If the method is not entrant then a JMP is plastered over the
2056 // first few bytes. If an oop in the old code was there, that oop
2057 // should not get GC'd. Skip the first few bytes of oops on
2058 // not-entrant methods.
2059 address low_boundary = verified_entry_point();
2060 if (is_not_entrant()) {
2061 low_boundary += NOT_MIPS64(NativeJump)MIPS64_ONLY(NativeGeneralJump)::instruction_size;
2062 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
2063 // (See comment above.)
2064 }
2066 RelocIterator iter(this, low_boundary);
2067 while(iter.next()) {
2069 switch (iter.type()) {
2071 case relocInfo::virtual_call_type:
2072 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
2073 break;
2075 case relocInfo::opt_virtual_call_type:
2076 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
2077 break;
2079 case relocInfo::static_call_type:
2080 clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this);
2081 break;
2082 }
2083 }
2084 }
2086 #ifdef ASSERT
2088 class CheckClass : AllStatic {
2089 static BoolObjectClosure* _is_alive;
2091 // Check class_loader is alive for this bit of metadata.
2092 static void check_class(Metadata* md) {
2093 Klass* klass = NULL;
2094 if (md->is_klass()) {
2095 klass = ((Klass*)md);
2096 } else if (md->is_method()) {
2097 klass = ((Method*)md)->method_holder();
2098 } else if (md->is_methodData()) {
2099 klass = ((MethodData*)md)->method()->method_holder();
2100 } else {
2101 md->print();
2102 ShouldNotReachHere();
2103 }
2104 assert(klass->is_loader_alive(_is_alive), "must be alive");
2105 }
2106 public:
2107 static void do_check_class(BoolObjectClosure* is_alive, nmethod* nm) {
2108 assert(SafepointSynchronize::is_at_safepoint(), "this is only ok at safepoint");
2109 _is_alive = is_alive;
2110 nm->metadata_do(check_class);
2111 }
2112 };
2114 // This is called during a safepoint so can use static data
2115 BoolObjectClosure* CheckClass::_is_alive = NULL;
2116 #endif // ASSERT
2119 // Processing of oop references should have been sufficient to keep
2120 // all strong references alive. Any weak references should have been
2121 // cleared as well. Visit all the metadata and ensure that it's
2122 // really alive.
2123 void nmethod::verify_metadata_loaders(address low_boundary, BoolObjectClosure* is_alive) {
2124 #ifdef ASSERT
2125 RelocIterator iter(this, low_boundary);
2126 while (iter.next()) {
2127 // static_stub_Relocations may have dangling references to
2128 // Method*s so trim them out here. Otherwise it looks like
2129 // compiled code is maintaining a link to dead metadata.
2130 address static_call_addr = NULL;
2131 if (iter.type() == relocInfo::opt_virtual_call_type) {
2132 CompiledIC* cic = CompiledIC_at(&iter);
2133 if (!cic->is_call_to_interpreted()) {
2134 static_call_addr = iter.addr();
2135 }
2136 } else if (iter.type() == relocInfo::static_call_type) {
2137 CompiledStaticCall* csc = compiledStaticCall_at(iter.reloc());
2138 if (!csc->is_call_to_interpreted()) {
2139 static_call_addr = iter.addr();
2140 }
2141 }
2142 if (static_call_addr != NULL) {
2143 RelocIterator sciter(this, low_boundary);
2144 while (sciter.next()) {
2145 if (sciter.type() == relocInfo::static_stub_type &&
2146 sciter.static_stub_reloc()->static_call() == static_call_addr) {
2147 sciter.static_stub_reloc()->clear_inline_cache();
2148 }
2149 }
2150 }
2151 }
2152 // Check that the metadata embedded in the nmethod is alive
2153 CheckClass::do_check_class(is_alive, this);
2154 #endif
2155 }
2158 // Iterate over metadata calling this function. Used by RedefineClasses
2159 void nmethod::metadata_do(void f(Metadata*)) {
2160 address low_boundary = verified_entry_point();
2161 if (is_not_entrant()) {
2162 low_boundary += NOT_MIPS64(NativeJump)MIPS64_ONLY(NativeGeneralJump)::instruction_size;
2163 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
2164 // (See comment above.)
2165 }
2166 {
2167 // Visit all immediate references that are embedded in the instruction stream.
2168 RelocIterator iter(this, low_boundary);
2169 while (iter.next()) {
2170 if (iter.type() == relocInfo::metadata_type ) {
2171 metadata_Relocation* r = iter.metadata_reloc();
2172 // In this metadata, we must only follow those metadatas directly embedded in
2173 // the code. Other metadatas (oop_index>0) are seen as part of
2174 // the metadata section below.
2175 assert(1 == (r->metadata_is_immediate()) +
2176 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
2177 "metadata must be found in exactly one place");
2178 if (r->metadata_is_immediate() && r->metadata_value() != NULL) {
2179 Metadata* md = r->metadata_value();
2180 if (md != _method) f(md);
2181 }
2182 } else if (iter.type() == relocInfo::virtual_call_type) {
2183 // Check compiledIC holders associated with this nmethod
2184 ResourceMark rm;
2185 CompiledIC *ic = CompiledIC_at(&iter);
2186 if (ic->is_icholder_call()) {
2187 CompiledICHolder* cichk = ic->cached_icholder();
2188 f(cichk->holder_metadata());
2189 f(cichk->holder_klass());
2190 } else {
2191 Metadata* ic_oop = ic->cached_metadata();
2192 if (ic_oop != NULL) {
2193 f(ic_oop);
2194 }
2195 }
2196 }
2197 }
2198 }
2200 // Visit the metadata section
2201 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
2202 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops
2203 Metadata* md = *p;
2204 f(md);
2205 }
2207 // Call function Method*, not embedded in these other places.
2208 if (_method != NULL) f(_method);
2209 }
2211 void nmethod::oops_do(OopClosure* f, bool allow_zombie) {
2212 // make sure the oops ready to receive visitors
2213 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod");
2214 assert(!is_unloaded(), "should not call follow on unloaded nmethod");
2216 // If the method is not entrant or zombie then a JMP is plastered over the
2217 // first few bytes. If an oop in the old code was there, that oop
2218 // should not get GC'd. Skip the first few bytes of oops on
2219 // not-entrant methods.
2220 address low_boundary = verified_entry_point();
2221 if (is_not_entrant()) {
2222 low_boundary += NOT_MIPS64(NativeJump)MIPS64_ONLY(NativeGeneralJump)::instruction_size;
2223 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
2224 // (See comment above.)
2225 }
2227 RelocIterator iter(this, low_boundary);
2229 while (iter.next()) {
2230 if (iter.type() == relocInfo::oop_type ) {
2231 oop_Relocation* r = iter.oop_reloc();
2232 // In this loop, we must only follow those oops directly embedded in
2233 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
2234 assert(1 == (r->oop_is_immediate()) +
2235 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
2236 "oop must be found in exactly one place");
2237 if (r->oop_is_immediate() && r->oop_value() != NULL) {
2238 f->do_oop(r->oop_addr());
2239 }
2240 }
2241 }
2243 // Scopes
2244 // This includes oop constants not inlined in the code stream.
2245 for (oop* p = oops_begin(); p < oops_end(); p++) {
2246 if (*p == Universe::non_oop_word()) continue; // skip non-oops
2247 f->do_oop(p);
2248 }
2249 }
2251 #define NMETHOD_SENTINEL ((nmethod*)badAddress)
2253 nmethod* volatile nmethod::_oops_do_mark_nmethods;
2255 // An nmethod is "marked" if its _mark_link is set non-null.
2256 // Even if it is the end of the linked list, it will have a non-null link value,
2257 // as long as it is on the list.
2258 // This code must be MP safe, because it is used from parallel GC passes.
2259 bool nmethod::test_set_oops_do_mark() {
2260 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");
2261 nmethod* observed_mark_link = _oops_do_mark_link;
2262 if (observed_mark_link == NULL) {
2263 // Claim this nmethod for this thread to mark.
2264 observed_mark_link = (nmethod*)
2265 Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_link, NULL);
2266 if (observed_mark_link == NULL) {
2268 // Atomically append this nmethod (now claimed) to the head of the list:
2269 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods;
2270 for (;;) {
2271 nmethod* required_mark_nmethods = observed_mark_nmethods;
2272 _oops_do_mark_link = required_mark_nmethods;
2273 observed_mark_nmethods = (nmethod*)
2274 Atomic::cmpxchg_ptr(this, &_oops_do_mark_nmethods, required_mark_nmethods);
2275 if (observed_mark_nmethods == required_mark_nmethods)
2276 break;
2277 }
2278 // Mark was clear when we first saw this guy.
2279 NOT_PRODUCT(if (TraceScavenge) print_on(tty, "oops_do, mark"));
2280 return false;
2281 }
2282 }
2283 // On fall through, another racing thread marked this nmethod before we did.
2284 return true;
2285 }
2287 void nmethod::oops_do_marking_prologue() {
2288 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("[oops_do_marking_prologue"));
2289 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row");
2290 // We use cmpxchg_ptr instead of regular assignment here because the user
2291 // may fork a bunch of threads, and we need them all to see the same state.
2292 void* observed = Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, NULL);
2293 guarantee(observed == NULL, "no races in this sequential code");
2294 }
2296 void nmethod::oops_do_marking_epilogue() {
2297 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row");
2298 nmethod* cur = _oops_do_mark_nmethods;
2299 while (cur != NMETHOD_SENTINEL) {
2300 assert(cur != NULL, "not NULL-terminated");
2301 nmethod* next = cur->_oops_do_mark_link;
2302 cur->_oops_do_mark_link = NULL;
2303 DEBUG_ONLY(cur->verify_oop_relocations());
2304 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark"));
2305 cur = next;
2306 }
2307 void* required = _oops_do_mark_nmethods;
2308 void* observed = Atomic::cmpxchg_ptr(NULL, &_oops_do_mark_nmethods, required);
2309 guarantee(observed == required, "no races in this sequential code");
2310 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("oops_do_marking_epilogue]"));
2311 }
2313 class DetectScavengeRoot: public OopClosure {
2314 bool _detected_scavenge_root;
2315 public:
2316 DetectScavengeRoot() : _detected_scavenge_root(false)
2317 { NOT_PRODUCT(_print_nm = NULL); }
2318 bool detected_scavenge_root() { return _detected_scavenge_root; }
2319 virtual void do_oop(oop* p) {
2320 if ((*p) != NULL && (*p)->is_scavengable()) {
2321 NOT_PRODUCT(maybe_print(p));
2322 _detected_scavenge_root = true;
2323 }
2324 }
2325 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2327 #ifndef PRODUCT
2328 nmethod* _print_nm;
2329 void maybe_print(oop* p) {
2330 if (_print_nm == NULL) return;
2331 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root");
2332 tty->print_cr("" PTR_FORMAT "[offset=%d] detected scavengable oop " PTR_FORMAT " (found at " PTR_FORMAT ")",
2333 _print_nm, (int)((intptr_t)p - (intptr_t)_print_nm),
2334 (void *)(*p), (intptr_t)p);
2335 (*p)->print();
2336 }
2337 #endif //PRODUCT
2338 };
2340 bool nmethod::detect_scavenge_root_oops() {
2341 DetectScavengeRoot detect_scavenge_root;
2342 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this);
2343 oops_do(&detect_scavenge_root);
2344 return detect_scavenge_root.detected_scavenge_root();
2345 }
2347 // Method that knows how to preserve outgoing arguments at call. This method must be
2348 // called with a frame corresponding to a Java invoke
2349 void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) {
2350 #ifndef SHARK
2351 if (!method()->is_native()) {
2352 SimpleScopeDesc ssd(this, fr.pc());
2353 Bytecode_invoke call(ssd.method(), ssd.bci());
2354 bool has_receiver = call.has_receiver();
2355 bool has_appendix = call.has_appendix();
2356 Symbol* signature = call.signature();
2357 fr.oops_compiled_arguments_do(signature, has_receiver, has_appendix, reg_map, f);
2358 }
2359 #endif // !SHARK
2360 }
2363 oop nmethod::embeddedOop_at(u_char* p) {
2364 RelocIterator iter(this, p, p + 1);
2365 while (iter.next())
2366 if (iter.type() == relocInfo::oop_type) {
2367 return iter.oop_reloc()->oop_value();
2368 }
2369 return NULL;
2370 }
2373 inline bool includes(void* p, void* from, void* to) {
2374 return from <= p && p < to;
2375 }
2378 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
2379 assert(count >= 2, "must be sentinel values, at least");
2381 #ifdef ASSERT
2382 // must be sorted and unique; we do a binary search in find_pc_desc()
2383 int prev_offset = pcs[0].pc_offset();
2384 assert(prev_offset == PcDesc::lower_offset_limit,
2385 "must start with a sentinel");
2386 for (int i = 1; i < count; i++) {
2387 int this_offset = pcs[i].pc_offset();
2388 assert(this_offset > prev_offset, "offsets must be sorted");
2389 prev_offset = this_offset;
2390 }
2391 assert(prev_offset == PcDesc::upper_offset_limit,
2392 "must end with a sentinel");
2393 #endif //ASSERT
2395 // Search for MethodHandle invokes and tag the nmethod.
2396 for (int i = 0; i < count; i++) {
2397 if (pcs[i].is_method_handle_invoke()) {
2398 set_has_method_handle_invokes(true);
2399 break;
2400 }
2401 }
2402 assert(has_method_handle_invokes() == (_deoptimize_mh_offset != -1), "must have deopt mh handler");
2404 int size = count * sizeof(PcDesc);
2405 assert(scopes_pcs_size() >= size, "oob");
2406 memcpy(scopes_pcs_begin(), pcs, size);
2408 // Adjust the final sentinel downward.
2409 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
2410 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
2411 last_pc->set_pc_offset(content_size() + 1);
2412 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
2413 // Fill any rounding gaps with copies of the last record.
2414 last_pc[1] = last_pc[0];
2415 }
2416 // The following assert could fail if sizeof(PcDesc) is not
2417 // an integral multiple of oopSize (the rounding term).
2418 // If it fails, change the logic to always allocate a multiple
2419 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
2420 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
2421 }
2423 void nmethod::copy_scopes_data(u_char* buffer, int size) {
2424 assert(scopes_data_size() >= size, "oob");
2425 memcpy(scopes_data_begin(), buffer, size);
2426 }
2429 #ifdef ASSERT
2430 static PcDesc* linear_search(nmethod* nm, int pc_offset, bool approximate) {
2431 PcDesc* lower = nm->scopes_pcs_begin();
2432 PcDesc* upper = nm->scopes_pcs_end();
2433 lower += 1; // exclude initial sentinel
2434 PcDesc* res = NULL;
2435 for (PcDesc* p = lower; p < upper; p++) {
2436 NOT_PRODUCT(--nmethod_stats.pc_desc_tests); // don't count this call to match_desc
2437 if (match_desc(p, pc_offset, approximate)) {
2438 if (res == NULL)
2439 res = p;
2440 else
2441 res = (PcDesc*) badAddress;
2442 }
2443 }
2444 return res;
2445 }
2446 #endif
2449 // Finds a PcDesc with real-pc equal to "pc"
2450 PcDesc* nmethod::find_pc_desc_internal(address pc, bool approximate) {
2451 address base_address = code_begin();
2452 if ((pc < base_address) ||
2453 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
2454 return NULL; // PC is wildly out of range
2455 }
2456 int pc_offset = (int) (pc - base_address);
2458 // Check the PcDesc cache if it contains the desired PcDesc
2459 // (This as an almost 100% hit rate.)
2460 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
2461 if (res != NULL) {
2462 assert(res == linear_search(this, pc_offset, approximate), "cache ok");
2463 return res;
2464 }
2466 // Fallback algorithm: quasi-linear search for the PcDesc
2467 // Find the last pc_offset less than the given offset.
2468 // The successor must be the required match, if there is a match at all.
2469 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
2470 PcDesc* lower = scopes_pcs_begin();
2471 PcDesc* upper = scopes_pcs_end();
2472 upper -= 1; // exclude final sentinel
2473 if (lower >= upper) return NULL; // native method; no PcDescs at all
2475 #define assert_LU_OK \
2476 /* invariant on lower..upper during the following search: */ \
2477 assert(lower->pc_offset() < pc_offset, "sanity"); \
2478 assert(upper->pc_offset() >= pc_offset, "sanity")
2479 assert_LU_OK;
2481 // Use the last successful return as a split point.
2482 PcDesc* mid = _pc_desc_cache.last_pc_desc();
2483 NOT_PRODUCT(++nmethod_stats.pc_desc_searches);
2484 if (mid->pc_offset() < pc_offset) {
2485 lower = mid;
2486 } else {
2487 upper = mid;
2488 }
2490 // Take giant steps at first (4096, then 256, then 16, then 1)
2491 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
2492 const int RADIX = (1 << LOG2_RADIX);
2493 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
2494 while ((mid = lower + step) < upper) {
2495 assert_LU_OK;
2496 NOT_PRODUCT(++nmethod_stats.pc_desc_searches);
2497 if (mid->pc_offset() < pc_offset) {
2498 lower = mid;
2499 } else {
2500 upper = mid;
2501 break;
2502 }
2503 }
2504 assert_LU_OK;
2505 }
2507 // Sneak up on the value with a linear search of length ~16.
2508 while (true) {
2509 assert_LU_OK;
2510 mid = lower + 1;
2511 NOT_PRODUCT(++nmethod_stats.pc_desc_searches);
2512 if (mid->pc_offset() < pc_offset) {
2513 lower = mid;
2514 } else {
2515 upper = mid;
2516 break;
2517 }
2518 }
2519 #undef assert_LU_OK
2521 if (match_desc(upper, pc_offset, approximate)) {
2522 assert(upper == linear_search(this, pc_offset, approximate), "search ok");
2523 _pc_desc_cache.add_pc_desc(upper);
2524 return upper;
2525 } else {
2526 assert(NULL == linear_search(this, pc_offset, approximate), "search ok");
2527 return NULL;
2528 }
2529 }
2532 bool nmethod::check_all_dependencies() {
2533 bool found_check = false;
2534 // wholesale check of all dependencies
2535 for (Dependencies::DepStream deps(this); deps.next(); ) {
2536 if (deps.check_dependency() != NULL) {
2537 found_check = true;
2538 NOT_DEBUG(break);
2539 }
2540 }
2541 return found_check; // tell caller if we found anything
2542 }
2544 bool nmethod::check_dependency_on(DepChange& changes) {
2545 // What has happened:
2546 // 1) a new class dependee has been added
2547 // 2) dependee and all its super classes have been marked
2548 bool found_check = false; // set true if we are upset
2549 for (Dependencies::DepStream deps(this); deps.next(); ) {
2550 // Evaluate only relevant dependencies.
2551 if (deps.spot_check_dependency_at(changes) != NULL) {
2552 found_check = true;
2553 NOT_DEBUG(break);
2554 }
2555 }
2556 return found_check;
2557 }
2559 bool nmethod::is_evol_dependent_on(Klass* dependee) {
2560 InstanceKlass *dependee_ik = InstanceKlass::cast(dependee);
2561 Array<Method*>* dependee_methods = dependee_ik->methods();
2562 for (Dependencies::DepStream deps(this); deps.next(); ) {
2563 if (deps.type() == Dependencies::evol_method) {
2564 Method* method = deps.method_argument(0);
2565 for (int j = 0; j < dependee_methods->length(); j++) {
2566 if (dependee_methods->at(j) == method) {
2567 // RC_TRACE macro has an embedded ResourceMark
2568 RC_TRACE(0x01000000,
2569 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)",
2570 _method->method_holder()->external_name(),
2571 _method->name()->as_C_string(),
2572 _method->signature()->as_C_string(), compile_id(),
2573 method->method_holder()->external_name(),
2574 method->name()->as_C_string(),
2575 method->signature()->as_C_string()));
2576 if (TraceDependencies || LogCompilation)
2577 deps.log_dependency(dependee);
2578 return true;
2579 }
2580 }
2581 }
2582 }
2583 return false;
2584 }
2586 // Called from mark_for_deoptimization, when dependee is invalidated.
2587 bool nmethod::is_dependent_on_method(Method* dependee) {
2588 for (Dependencies::DepStream deps(this); deps.next(); ) {
2589 if (deps.type() != Dependencies::evol_method)
2590 continue;
2591 Method* method = deps.method_argument(0);
2592 if (method == dependee) return true;
2593 }
2594 return false;
2595 }
2598 bool nmethod::is_patchable_at(address instr_addr) {
2599 assert(insts_contains(instr_addr), "wrong nmethod used");
2600 if (is_zombie()) {
2601 // a zombie may never be patched
2602 return false;
2603 }
2604 return true;
2605 }
2608 address nmethod::continuation_for_implicit_exception(address pc) {
2609 // Exception happened outside inline-cache check code => we are inside
2610 // an active nmethod => use cpc to determine a return address
2611 int exception_offset = pc - code_begin();
2612 int cont_offset = ImplicitExceptionTable(this).at( exception_offset );
2613 #ifdef ASSERT
2614 if (cont_offset == 0) {
2615 Thread* thread = ThreadLocalStorage::get_thread_slow();
2616 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
2617 HandleMark hm(thread);
2618 ResourceMark rm(thread);
2619 CodeBlob* cb = CodeCache::find_blob(pc);
2620 assert(cb != NULL && cb == this, "");
2621 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, pc);
2622 print();
2623 method()->print_codes();
2624 print_code();
2625 print_pcs();
2626 }
2627 #endif
2628 if (cont_offset == 0) {
2629 // Let the normal error handling report the exception
2630 return NULL;
2631 }
2632 return code_begin() + cont_offset;
2633 }
2637 void nmethod_init() {
2638 // make sure you didn't forget to adjust the filler fields
2639 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
2640 }
2643 //-------------------------------------------------------------------------------------------
2646 // QQQ might we make this work from a frame??
2647 nmethodLocker::nmethodLocker(address pc) {
2648 CodeBlob* cb = CodeCache::find_blob(pc);
2649 guarantee(cb != NULL && cb->is_nmethod(), "bad pc for a nmethod found");
2650 _nm = (nmethod*)cb;
2651 lock_nmethod(_nm);
2652 }
2654 // Only JvmtiDeferredEvent::compiled_method_unload_event()
2655 // should pass zombie_ok == true.
2656 void nmethodLocker::lock_nmethod(nmethod* nm, bool zombie_ok) {
2657 if (nm == NULL) return;
2658 Atomic::inc(&nm->_lock_count);
2659 guarantee(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method");
2660 }
2662 void nmethodLocker::unlock_nmethod(nmethod* nm) {
2663 if (nm == NULL) return;
2664 Atomic::dec(&nm->_lock_count);
2665 guarantee(nm->_lock_count >= 0, "unmatched nmethod lock/unlock");
2666 }
2669 // -----------------------------------------------------------------------------
2670 // nmethod::get_deopt_original_pc
2671 //
2672 // Return the original PC for the given PC if:
2673 // (a) the given PC belongs to a nmethod and
2674 // (b) it is a deopt PC
2675 address nmethod::get_deopt_original_pc(const frame* fr) {
2676 if (fr->cb() == NULL) return NULL;
2678 nmethod* nm = fr->cb()->as_nmethod_or_null();
2679 if (nm != NULL && nm->is_deopt_pc(fr->pc()))
2680 return nm->get_original_pc(fr);
2682 return NULL;
2683 }
2686 // -----------------------------------------------------------------------------
2687 // MethodHandle
2689 bool nmethod::is_method_handle_return(address return_pc) {
2690 if (!has_method_handle_invokes()) return false;
2691 PcDesc* pd = pc_desc_at(return_pc);
2692 if (pd == NULL)
2693 return false;
2694 return pd->is_method_handle_invoke();
2695 }
2698 // -----------------------------------------------------------------------------
2699 // Verification
2701 class VerifyOopsClosure: public OopClosure {
2702 nmethod* _nm;
2703 bool _ok;
2704 public:
2705 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
2706 bool ok() { return _ok; }
2707 virtual void do_oop(oop* p) {
2708 if ((*p) == NULL || (*p)->is_oop()) return;
2709 if (_ok) {
2710 _nm->print_nmethod(true);
2711 _ok = false;
2712 }
2713 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2714 (void *)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm));
2715 }
2716 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2717 };
2719 void nmethod::verify() {
2721 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant
2722 // seems odd.
2724 if (is_zombie() || is_not_entrant() || is_unloaded())
2725 return;
2727 // Make sure all the entry points are correctly aligned for patching.
2728 NOT_MIPS64(NativeJump)MIPS64_ONLY(NativeGeneralJump)::check_verified_entry_alignment(entry_point(), verified_entry_point());
2730 // assert(method()->is_oop(), "must be valid");
2732 ResourceMark rm;
2734 if (!CodeCache::contains(this)) {
2735 fatal(err_msg("nmethod at " INTPTR_FORMAT " not in zone", this));
2736 }
2738 if(is_native_method() )
2739 return;
2741 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
2742 if (nm != this) {
2743 fatal(err_msg("findNMethod did not find this nmethod (" INTPTR_FORMAT ")",
2744 this));
2745 }
2747 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2748 if (! p->verify(this)) {
2749 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", this);
2750 }
2751 }
2753 VerifyOopsClosure voc(this);
2754 oops_do(&voc);
2755 assert(voc.ok(), "embedded oops must be OK");
2756 verify_scavenge_root_oops();
2758 verify_scopes();
2759 }
2762 void nmethod::verify_interrupt_point(address call_site) {
2763 // Verify IC only when nmethod installation is finished.
2764 bool is_installed = (method()->code() == this) // nmethod is in state 'in_use' and installed
2765 || !this->is_in_use(); // nmethod is installed, but not in 'in_use' state
2766 if (is_installed) {
2767 Thread *cur = Thread::current();
2768 if (CompiledIC_lock->owner() == cur ||
2769 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) &&
2770 SafepointSynchronize::is_at_safepoint())) {
2771 CompiledIC_at(this, call_site);
2772 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
2773 } else {
2774 MutexLocker ml_verify (CompiledIC_lock);
2775 CompiledIC_at(this, call_site);
2776 }
2777 }
2779 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address());
2780 assert(pd != NULL, "PcDesc must exist");
2781 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(),
2782 pd->obj_decode_offset(), pd->should_reexecute(),
2783 pd->return_oop());
2784 !sd->is_top(); sd = sd->sender()) {
2785 sd->verify();
2786 }
2787 }
2789 void nmethod::verify_scopes() {
2790 if( !method() ) return; // Runtime stubs have no scope
2791 if (method()->is_native()) return; // Ignore stub methods.
2792 // iterate through all interrupt point
2793 // and verify the debug information is valid.
2794 RelocIterator iter((nmethod*)this);
2795 while (iter.next()) {
2796 address stub = NULL;
2797 switch (iter.type()) {
2798 case relocInfo::virtual_call_type:
2799 verify_interrupt_point(iter.addr());
2800 break;
2801 case relocInfo::opt_virtual_call_type:
2802 stub = iter.opt_virtual_call_reloc()->static_stub();
2803 verify_interrupt_point(iter.addr());
2804 break;
2805 case relocInfo::static_call_type:
2806 stub = iter.static_call_reloc()->static_stub();
2807 //verify_interrupt_point(iter.addr());
2808 break;
2809 case relocInfo::runtime_call_type:
2810 address destination = iter.reloc()->value();
2811 // Right now there is no way to find out which entries support
2812 // an interrupt point. It would be nice if we had this
2813 // information in a table.
2814 break;
2815 }
2816 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section");
2817 }
2818 }
2821 // -----------------------------------------------------------------------------
2822 // Non-product code
2823 #ifndef PRODUCT
2825 class DebugScavengeRoot: public OopClosure {
2826 nmethod* _nm;
2827 bool _ok;
2828 public:
2829 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { }
2830 bool ok() { return _ok; }
2831 virtual void do_oop(oop* p) {
2832 if ((*p) == NULL || !(*p)->is_scavengable()) return;
2833 if (_ok) {
2834 _nm->print_nmethod(true);
2835 _ok = false;
2836 }
2837 tty->print_cr("*** scavengable oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2838 (void *)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm));
2839 (*p)->print();
2840 }
2841 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2842 };
2844 void nmethod::verify_scavenge_root_oops() {
2845 if (UseG1GC) {
2846 return;
2847 }
2849 if (!on_scavenge_root_list()) {
2850 // Actually look inside, to verify the claim that it's clean.
2851 DebugScavengeRoot debug_scavenge_root(this);
2852 oops_do(&debug_scavenge_root);
2853 if (!debug_scavenge_root.ok())
2854 fatal("found an unadvertised bad scavengable oop in the code cache");
2855 }
2856 assert(scavenge_root_not_marked(), "");
2857 }
2859 #endif // PRODUCT
2861 // Printing operations
2863 void nmethod::print() const {
2864 ResourceMark rm;
2865 ttyLocker ttyl; // keep the following output all in one block
2867 tty->print("Compiled method ");
2869 if (is_compiled_by_c1()) {
2870 tty->print("(c1) ");
2871 } else if (is_compiled_by_c2()) {
2872 tty->print("(c2) ");
2873 } else if (is_compiled_by_shark()) {
2874 tty->print("(shark) ");
2875 } else {
2876 tty->print("(nm) ");
2877 }
2879 print_on(tty, NULL);
2881 if (WizardMode) {
2882 tty->print("((nmethod*) " INTPTR_FORMAT ") ", this);
2883 tty->print(" for method " INTPTR_FORMAT , (address)method());
2884 tty->print(" { ");
2885 if (is_in_use()) tty->print("in_use ");
2886 if (is_not_entrant()) tty->print("not_entrant ");
2887 if (is_zombie()) tty->print("zombie ");
2888 if (is_unloaded()) tty->print("unloaded ");
2889 if (on_scavenge_root_list()) tty->print("scavenge_root ");
2890 tty->print_cr("}:");
2891 }
2892 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2893 (address)this,
2894 (address)this + size(),
2895 size());
2896 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2897 relocation_begin(),
2898 relocation_end(),
2899 relocation_size());
2900 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2901 consts_begin(),
2902 consts_end(),
2903 consts_size());
2904 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2905 insts_begin(),
2906 insts_end(),
2907 insts_size());
2908 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2909 stub_begin(),
2910 stub_end(),
2911 stub_size());
2912 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2913 oops_begin(),
2914 oops_end(),
2915 oops_size());
2916 if (metadata_size () > 0) tty->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2917 metadata_begin(),
2918 metadata_end(),
2919 metadata_size());
2920 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2921 scopes_data_begin(),
2922 scopes_data_end(),
2923 scopes_data_size());
2924 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2925 scopes_pcs_begin(),
2926 scopes_pcs_end(),
2927 scopes_pcs_size());
2928 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2929 dependencies_begin(),
2930 dependencies_end(),
2931 dependencies_size());
2932 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2933 handler_table_begin(),
2934 handler_table_end(),
2935 handler_table_size());
2936 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2937 nul_chk_table_begin(),
2938 nul_chk_table_end(),
2939 nul_chk_table_size());
2940 }
2942 void nmethod::print_code() {
2943 HandleMark hm;
2944 ResourceMark m;
2945 Disassembler::decode(this);
2946 }
2949 #ifndef PRODUCT
2951 void nmethod::print_scopes() {
2952 // Find the first pc desc for all scopes in the code and print it.
2953 ResourceMark rm;
2954 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2955 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
2956 continue;
2958 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
2959 sd->print_on(tty, p);
2960 }
2961 }
2963 void nmethod::print_dependencies() {
2964 ResourceMark rm;
2965 ttyLocker ttyl; // keep the following output all in one block
2966 tty->print_cr("Dependencies:");
2967 for (Dependencies::DepStream deps(this); deps.next(); ) {
2968 deps.print_dependency();
2969 Klass* ctxk = deps.context_type();
2970 if (ctxk != NULL) {
2971 if (ctxk->oop_is_instance() && ((InstanceKlass*)ctxk)->is_dependent_nmethod(this)) {
2972 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name());
2973 }
2974 }
2975 deps.log_dependency(); // put it into the xml log also
2976 }
2977 }
2980 void nmethod::print_relocations() {
2981 ResourceMark m; // in case methods get printed via the debugger
2982 tty->print_cr("relocations:");
2983 RelocIterator iter(this);
2984 iter.print();
2985 if (UseRelocIndex) {
2986 jint* index_end = (jint*)relocation_end() - 1;
2987 jint index_size = *index_end;
2988 jint* index_start = (jint*)( (address)index_end - index_size );
2989 tty->print_cr(" index @" INTPTR_FORMAT ": index_size=%d", index_start, index_size);
2990 if (index_size > 0) {
2991 jint* ip;
2992 for (ip = index_start; ip+2 <= index_end; ip += 2)
2993 tty->print_cr(" (%d %d) addr=" INTPTR_FORMAT " @" INTPTR_FORMAT,
2994 ip[0],
2995 ip[1],
2996 header_end()+ip[0],
2997 relocation_begin()-1+ip[1]);
2998 for (; ip < index_end; ip++)
2999 tty->print_cr(" (%d ?)", ip[0]);
3000 tty->print_cr(" @" INTPTR_FORMAT ": index_size=%d", ip, *ip);
3001 ip++;
3002 tty->print_cr("reloc_end @" INTPTR_FORMAT ":", ip);
3003 }
3004 }
3005 }
3008 void nmethod::print_pcs() {
3009 ResourceMark m; // in case methods get printed via debugger
3010 tty->print_cr("pc-bytecode offsets:");
3011 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
3012 p->print(this);
3013 }
3014 }
3016 #endif // PRODUCT
3018 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
3019 RelocIterator iter(this, begin, end);
3020 bool have_one = false;
3021 while (iter.next()) {
3022 have_one = true;
3023 switch (iter.type()) {
3024 case relocInfo::none: return "no_reloc";
3025 case relocInfo::oop_type: {
3026 stringStream st;
3027 oop_Relocation* r = iter.oop_reloc();
3028 oop obj = r->oop_value();
3029 st.print("oop(");
3030 if (obj == NULL) st.print("NULL");
3031 else obj->print_value_on(&st);
3032 st.print(")");
3033 return st.as_string();
3034 }
3035 case relocInfo::metadata_type: {
3036 stringStream st;
3037 metadata_Relocation* r = iter.metadata_reloc();
3038 Metadata* obj = r->metadata_value();
3039 st.print("metadata(");
3040 if (obj == NULL) st.print("NULL");
3041 else obj->print_value_on(&st);
3042 st.print(")");
3043 return st.as_string();
3044 }
3045 case relocInfo::virtual_call_type: return "virtual_call";
3046 case relocInfo::opt_virtual_call_type: return "optimized virtual_call";
3047 case relocInfo::static_call_type: return "static_call";
3048 case relocInfo::static_stub_type: return "static_stub";
3049 case relocInfo::runtime_call_type: return "runtime_call";
3050 case relocInfo::external_word_type: return "external_word";
3051 case relocInfo::internal_word_type: return "internal_word";
3052 case relocInfo::section_word_type: return "section_word";
3053 case relocInfo::poll_type: return "poll";
3054 case relocInfo::poll_return_type: return "poll_return";
3055 case relocInfo::type_mask: return "type_bit_mask";
3056 }
3057 }
3058 return have_one ? "other" : NULL;
3059 }
3061 // Return a the last scope in (begin..end]
3062 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
3063 PcDesc* p = pc_desc_near(begin+1);
3064 if (p != NULL && p->real_pc(this) <= end) {
3065 return new ScopeDesc(this, p->scope_decode_offset(),
3066 p->obj_decode_offset(), p->should_reexecute(),
3067 p->return_oop());
3068 }
3069 return NULL;
3070 }
3072 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const {
3073 if (block_begin == entry_point()) stream->print_cr("[Entry Point]");
3074 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]");
3075 if (block_begin == exception_begin()) stream->print_cr("[Exception Handler]");
3076 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]");
3077 if (block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]");
3079 if (has_method_handle_invokes())
3080 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]");
3082 if (block_begin == consts_begin()) stream->print_cr("[Constants]");
3084 if (block_begin == entry_point()) {
3085 methodHandle m = method();
3086 if (m.not_null()) {
3087 stream->print(" # ");
3088 m->print_value_on(stream);
3089 stream->cr();
3090 }
3091 if (m.not_null() && !is_osr_method()) {
3092 ResourceMark rm;
3093 int sizeargs = m->size_of_parameters();
3094 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
3095 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
3096 {
3097 int sig_index = 0;
3098 if (!m->is_static())
3099 sig_bt[sig_index++] = T_OBJECT; // 'this'
3100 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) {
3101 BasicType t = ss.type();
3102 sig_bt[sig_index++] = t;
3103 if (type2size[t] == 2) {
3104 sig_bt[sig_index++] = T_VOID;
3105 } else {
3106 assert(type2size[t] == 1, "size is 1 or 2");
3107 }
3108 }
3109 assert(sig_index == sizeargs, "");
3110 }
3111 const char* spname = "sp"; // make arch-specific?
3112 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false);
3113 int stack_slot_offset = this->frame_size() * wordSize;
3114 int tab1 = 14, tab2 = 24;
3115 int sig_index = 0;
3116 int arg_index = (m->is_static() ? 0 : -1);
3117 bool did_old_sp = false;
3118 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) {
3119 bool at_this = (arg_index == -1);
3120 bool at_old_sp = false;
3121 BasicType t = (at_this ? T_OBJECT : ss.type());
3122 assert(t == sig_bt[sig_index], "sigs in sync");
3123 if (at_this)
3124 stream->print(" # this: ");
3125 else
3126 stream->print(" # parm%d: ", arg_index);
3127 stream->move_to(tab1);
3128 VMReg fst = regs[sig_index].first();
3129 VMReg snd = regs[sig_index].second();
3130 if (fst->is_reg()) {
3131 stream->print("%s", fst->name());
3132 if (snd->is_valid()) {
3133 stream->print(":%s", snd->name());
3134 }
3135 } else if (fst->is_stack()) {
3136 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
3137 if (offset == stack_slot_offset) at_old_sp = true;
3138 stream->print("[%s+0x%x]", spname, offset);
3139 } else {
3140 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
3141 }
3142 stream->print(" ");
3143 stream->move_to(tab2);
3144 stream->print("= ");
3145 if (at_this) {
3146 m->method_holder()->print_value_on(stream);
3147 } else {
3148 bool did_name = false;
3149 if (!at_this && ss.is_object()) {
3150 Symbol* name = ss.as_symbol_or_null();
3151 if (name != NULL) {
3152 name->print_value_on(stream);
3153 did_name = true;
3154 }
3155 }
3156 if (!did_name)
3157 stream->print("%s", type2name(t));
3158 }
3159 if (at_old_sp) {
3160 stream->print(" (%s of caller)", spname);
3161 did_old_sp = true;
3162 }
3163 stream->cr();
3164 sig_index += type2size[t];
3165 arg_index += 1;
3166 if (!at_this) ss.next();
3167 }
3168 if (!did_old_sp) {
3169 stream->print(" # ");
3170 stream->move_to(tab1);
3171 stream->print("[%s+0x%x]", spname, stack_slot_offset);
3172 stream->print(" (%s of caller)", spname);
3173 stream->cr();
3174 }
3175 }
3176 }
3177 }
3179 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) {
3180 // First, find an oopmap in (begin, end].
3181 // We use the odd half-closed interval so that oop maps and scope descs
3182 // which are tied to the byte after a call are printed with the call itself.
3183 address base = code_begin();
3184 OopMapSet* oms = oop_maps();
3185 if (oms != NULL) {
3186 for (int i = 0, imax = oms->size(); i < imax; i++) {
3187 OopMap* om = oms->at(i);
3188 address pc = base + om->offset();
3189 if (pc > begin) {
3190 if (pc <= end) {
3191 st->move_to(column);
3192 st->print("; ");
3193 om->print_on(st);
3194 }
3195 break;
3196 }
3197 }
3198 }
3200 // Print any debug info present at this pc.
3201 ScopeDesc* sd = scope_desc_in(begin, end);
3202 if (sd != NULL) {
3203 st->move_to(column);
3204 if (sd->bci() == SynchronizationEntryBCI) {
3205 st->print(";*synchronization entry");
3206 } else {
3207 if (sd->method() == NULL) {
3208 st->print("method is NULL");
3209 } else if (sd->method()->is_native()) {
3210 st->print("method is native");
3211 } else {
3212 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci());
3213 st->print(";*%s", Bytecodes::name(bc));
3214 switch (bc) {
3215 case Bytecodes::_invokevirtual:
3216 case Bytecodes::_invokespecial:
3217 case Bytecodes::_invokestatic:
3218 case Bytecodes::_invokeinterface:
3219 {
3220 Bytecode_invoke invoke(sd->method(), sd->bci());
3221 st->print(" ");
3222 if (invoke.name() != NULL)
3223 invoke.name()->print_symbol_on(st);
3224 else
3225 st->print("<UNKNOWN>");
3226 break;
3227 }
3228 case Bytecodes::_getfield:
3229 case Bytecodes::_putfield:
3230 case Bytecodes::_getstatic:
3231 case Bytecodes::_putstatic:
3232 {
3233 Bytecode_field field(sd->method(), sd->bci());
3234 st->print(" ");
3235 if (field.name() != NULL)
3236 field.name()->print_symbol_on(st);
3237 else
3238 st->print("<UNKNOWN>");
3239 }
3240 }
3241 }
3242 }
3244 // Print all scopes
3245 for (;sd != NULL; sd = sd->sender()) {
3246 st->move_to(column);
3247 st->print("; -");
3248 if (sd->method() == NULL) {
3249 st->print("method is NULL");
3250 } else {
3251 sd->method()->print_short_name(st);
3252 }
3253 int lineno = sd->method()->line_number_from_bci(sd->bci());
3254 if (lineno != -1) {
3255 st->print("@%d (line %d)", sd->bci(), lineno);
3256 } else {
3257 st->print("@%d", sd->bci());
3258 }
3259 st->cr();
3260 }
3261 }
3263 // Print relocation information
3264 const char* str = reloc_string_for(begin, end);
3265 if (str != NULL) {
3266 if (sd != NULL) st->cr();
3267 st->move_to(column);
3268 st->print("; {%s}", str);
3269 }
3270 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin());
3271 if (cont_offset != 0) {
3272 st->move_to(column);
3273 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, code_begin() + cont_offset);
3274 }
3276 }
3278 #ifndef PRODUCT
3280 void nmethod::print_value_on(outputStream* st) const {
3281 st->print("nmethod");
3282 print_on(st, NULL);
3283 }
3285 void nmethod::print_calls(outputStream* st) {
3286 RelocIterator iter(this);
3287 while (iter.next()) {
3288 switch (iter.type()) {
3289 case relocInfo::virtual_call_type:
3290 case relocInfo::opt_virtual_call_type: {
3291 VerifyMutexLocker mc(CompiledIC_lock);
3292 CompiledIC_at(&iter)->print();
3293 break;
3294 }
3295 case relocInfo::static_call_type:
3296 st->print_cr("Static call at " INTPTR_FORMAT, iter.reloc()->addr());
3297 compiledStaticCall_at(iter.reloc())->print();
3298 break;
3299 }
3300 }
3301 }
3303 void nmethod::print_handler_table() {
3304 ExceptionHandlerTable(this).print();
3305 }
3307 void nmethod::print_nul_chk_table() {
3308 ImplicitExceptionTable(this).print(code_begin());
3309 }
3311 void nmethod::print_statistics() {
3312 ttyLocker ttyl;
3313 if (xtty != NULL) xtty->head("statistics type='nmethod'");
3314 nmethod_stats.print_native_nmethod_stats();
3315 nmethod_stats.print_nmethod_stats();
3316 DebugInformationRecorder::print_statistics();
3317 nmethod_stats.print_pc_stats();
3318 Dependencies::print_statistics();
3319 if (xtty != NULL) xtty->tail("statistics");
3320 }
3322 #endif // PRODUCT