9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "code/codeCache.hpp"
27 #include "code/compiledIC.hpp"
28 #include "code/dependencies.hpp"
29 #include "code/nmethod.hpp"
30 #include "code/scopeDesc.hpp"
31 #include "compiler/abstractCompiler.hpp"
32 #include "compiler/compileBroker.hpp"
33 #include "compiler/compileLog.hpp"
34 #include "compiler/compilerOracle.hpp"
35 #include "compiler/disassembler.hpp"
36 #include "interpreter/bytecode.hpp"
37 #include "oops/methodData.hpp"
38 #include "oops/oop.inline.hpp"
39 #include "prims/jvmtiRedefineClassesTrace.hpp"
40 #include "prims/jvmtiImpl.hpp"
41 #include "runtime/atomic.inline.hpp"
42 #include "runtime/orderAccess.inline.hpp"
43 #include "runtime/sharedRuntime.hpp"
44 #include "runtime/sweeper.hpp"
45 #include "utilities/resourceHash.hpp"
46 #include "utilities/dtrace.hpp"
47 #include "utilities/events.hpp"
48 #include "utilities/xmlstream.hpp"
49 #ifdef SHARK
50 #include "shark/sharkCompiler.hpp"
51 #endif
52
53 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
54
55 unsigned char nmethod::_global_unloading_clock = 0;
56
57 #ifdef DTRACE_ENABLED
58
59 // Only bother with this argument setup if dtrace is available
60
61 #define DTRACE_METHOD_UNLOAD_PROBE(method) \
62 { \
63 Method* m = (method); \
64 if (m != NULL) { \
65 Symbol* klass_name = m->klass_name(); \
66 Symbol* name = m->name(); \
67 Symbol* signature = m->signature(); \
68 HOTSPOT_COMPILED_METHOD_UNLOAD( \
69 (char *) klass_name->bytes(), klass_name->utf8_length(), \
70 (char *) name->bytes(), name->utf8_length(), \
71 (char *) signature->bytes(), signature->utf8_length()); \
72 } \
73 }
74
75 #else // ndef DTRACE_ENABLED
76
77 #define DTRACE_METHOD_UNLOAD_PROBE(method)
78
79 #endif
80
81 bool nmethod::is_compiled_by_c1() const {
82 if (compiler() == NULL) {
83 return false;
84 }
85 return compiler()->is_c1();
86 }
87 bool nmethod::is_compiled_by_c2() const {
88 if (compiler() == NULL) {
89 return false;
90 }
91 return compiler()->is_c2();
92 }
93 bool nmethod::is_compiled_by_shark() const {
94 if (compiler() == NULL) {
95 return false;
96 }
97 return compiler()->is_shark();
98 }
99
100
101
102 //---------------------------------------------------------------------------------
103 // NMethod statistics
104 // They are printed under various flags, including:
105 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation.
106 // (In the latter two cases, they like other stats are printed to the log only.)
107
108 #ifndef PRODUCT
109 // These variables are put into one block to reduce relocations
110 // and make it simpler to print from the debugger.
111 static
112 struct nmethod_stats_struct {
113 int nmethod_count;
114 int total_size;
115 int relocation_size;
116 int consts_size;
117 int insts_size;
118 int stub_size;
119 int scopes_data_size;
120 int scopes_pcs_size;
121 int dependencies_size;
122 int handler_table_size;
123 int nul_chk_table_size;
124 int oops_size;
125
126 void note_nmethod(nmethod* nm) {
127 nmethod_count += 1;
128 total_size += nm->size();
129 relocation_size += nm->relocation_size();
130 consts_size += nm->consts_size();
131 insts_size += nm->insts_size();
132 stub_size += nm->stub_size();
133 oops_size += nm->oops_size();
134 scopes_data_size += nm->scopes_data_size();
135 scopes_pcs_size += nm->scopes_pcs_size();
136 dependencies_size += nm->dependencies_size();
137 handler_table_size += nm->handler_table_size();
138 nul_chk_table_size += nm->nul_chk_table_size();
139 }
140 void print_nmethod_stats() {
141 if (nmethod_count == 0) return;
142 tty->print_cr("Statistics for %d bytecoded nmethods:", nmethod_count);
143 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size);
144 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size);
145 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size);
146 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size);
147 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size);
148 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size);
149 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size);
150 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size);
151 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size);
152 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size);
153 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size);
154 }
155
156 int native_nmethod_count;
157 int native_total_size;
158 int native_relocation_size;
159 int native_insts_size;
160 int native_oops_size;
161 void note_native_nmethod(nmethod* nm) {
162 native_nmethod_count += 1;
163 native_total_size += nm->size();
164 native_relocation_size += nm->relocation_size();
165 native_insts_size += nm->insts_size();
166 native_oops_size += nm->oops_size();
167 }
168 void print_native_nmethod_stats() {
169 if (native_nmethod_count == 0) return;
170 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count);
171 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size);
172 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size);
173 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size);
174 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size);
175 }
176
177 int pc_desc_resets; // number of resets (= number of caches)
178 int pc_desc_queries; // queries to nmethod::find_pc_desc
179 int pc_desc_approx; // number of those which have approximate true
180 int pc_desc_repeats; // number of _pc_descs[0] hits
181 int pc_desc_hits; // number of LRU cache hits
182 int pc_desc_tests; // total number of PcDesc examinations
183 int pc_desc_searches; // total number of quasi-binary search steps
184 int pc_desc_adds; // number of LUR cache insertions
185
186 void print_pc_stats() {
187 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query",
188 pc_desc_queries,
189 (double)(pc_desc_tests + pc_desc_searches)
190 / pc_desc_queries);
191 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d",
192 pc_desc_resets,
193 pc_desc_queries, pc_desc_approx,
194 pc_desc_repeats, pc_desc_hits,
195 pc_desc_tests, pc_desc_searches, pc_desc_adds);
196 }
197 } nmethod_stats;
198 #endif //PRODUCT
199
200
201 //---------------------------------------------------------------------------------
202
203
204 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) {
205 assert(pc != NULL, "Must be non null");
206 assert(exception.not_null(), "Must be non null");
207 assert(handler != NULL, "Must be non null");
208
209 _count = 0;
210 _exception_type = exception->klass();
211 _next = NULL;
212
213 add_address_and_handler(pc,handler);
214 }
215
216
217 address ExceptionCache::match(Handle exception, address pc) {
218 assert(pc != NULL,"Must be non null");
219 assert(exception.not_null(),"Must be non null");
259 // private method for handling exception cache
260 // These methods are private, and used to manipulate the exception cache
261 // directly.
262 ExceptionCache* nmethod::exception_cache_entry_for_exception(Handle exception) {
263 ExceptionCache* ec = exception_cache();
264 while (ec != NULL) {
265 if (ec->match_exception_with_space(exception)) {
266 return ec;
267 }
268 ec = ec->next();
269 }
270 return NULL;
271 }
272
273
274 //-----------------------------------------------------------------------------
275
276
277 // Helper used by both find_pc_desc methods.
278 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) {
279 NOT_PRODUCT(++nmethod_stats.pc_desc_tests);
280 if (!approximate)
281 return pc->pc_offset() == pc_offset;
282 else
283 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset();
284 }
285
286 void PcDescCache::reset_to(PcDesc* initial_pc_desc) {
287 if (initial_pc_desc == NULL) {
288 _pc_descs[0] = NULL; // native method; no PcDescs at all
289 return;
290 }
291 NOT_PRODUCT(++nmethod_stats.pc_desc_resets);
292 // reset the cache by filling it with benign (non-null) values
293 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel");
294 for (int i = 0; i < cache_size; i++)
295 _pc_descs[i] = initial_pc_desc;
296 }
297
298 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) {
299 NOT_PRODUCT(++nmethod_stats.pc_desc_queries);
300 NOT_PRODUCT(if (approximate) ++nmethod_stats.pc_desc_approx);
301
302 // Note: one might think that caching the most recently
303 // read value separately would be a win, but one would be
304 // wrong. When many threads are updating it, the cache
305 // line it's in would bounce between caches, negating
306 // any benefit.
307
308 // In order to prevent race conditions do not load cache elements
309 // repeatedly, but use a local copy:
310 PcDesc* res;
311
312 // Step one: Check the most recently added value.
313 res = _pc_descs[0];
314 if (res == NULL) return NULL; // native method; no PcDescs at all
315 if (match_desc(res, pc_offset, approximate)) {
316 NOT_PRODUCT(++nmethod_stats.pc_desc_repeats);
317 return res;
318 }
319
320 // Step two: Check the rest of the LRU cache.
321 for (int i = 1; i < cache_size; ++i) {
322 res = _pc_descs[i];
323 if (res->pc_offset() < 0) break; // optimization: skip empty cache
324 if (match_desc(res, pc_offset, approximate)) {
325 NOT_PRODUCT(++nmethod_stats.pc_desc_hits);
326 return res;
327 }
328 }
329
330 // Report failure.
331 return NULL;
332 }
333
334 void PcDescCache::add_pc_desc(PcDesc* pc_desc) {
335 NOT_PRODUCT(++nmethod_stats.pc_desc_adds);
336 // Update the LRU cache by shifting pc_desc forward.
337 for (int i = 0; i < cache_size; i++) {
338 PcDesc* next = _pc_descs[i];
339 _pc_descs[i] = pc_desc;
340 pc_desc = next;
341 }
342 }
343
344 // adjust pcs_size so that it is a multiple of both oopSize and
345 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple
346 // of oopSize, then 2*sizeof(PcDesc) is)
347 static int adjust_pcs_size(int pcs_size) {
348 int nsize = round_to(pcs_size, oopSize);
349 if ((nsize % sizeof(PcDesc)) != 0) {
350 nsize = pcs_size + sizeof(PcDesc);
351 }
352 assert((nsize % oopSize) == 0, "correct alignment");
353 return nsize;
354 }
355
461 _stack_traversal_mark = 0;
462 _unload_reported = false; // jvmti state
463
464 #ifdef ASSERT
465 _oops_are_stale = false;
466 #endif
467
468 _oops_do_mark_link = NULL;
469 _jmethod_id = NULL;
470 _osr_link = NULL;
471 if (UseG1GC) {
472 _unloading_next = NULL;
473 } else {
474 _scavenge_root_link = NULL;
475 }
476 _scavenge_root_state = 0;
477 _compiler = NULL;
478 #if INCLUDE_RTM_OPT
479 _rtm_state = NoRTM;
480 #endif
481 }
482
483 nmethod* nmethod::new_native_nmethod(methodHandle method,
484 int compile_id,
485 CodeBuffer *code_buffer,
486 int vep_offset,
487 int frame_complete,
488 int frame_size,
489 ByteSize basic_lock_owner_sp_offset,
490 ByteSize basic_lock_sp_offset,
491 OopMapSet* oop_maps) {
492 code_buffer->finalize_oop_references(method);
493 // create nmethod
494 nmethod* nm = NULL;
495 {
496 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
497 int native_nmethod_size = allocation_size(code_buffer, sizeof(nmethod));
498 CodeOffsets offsets;
499 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
500 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
501 nm = new (native_nmethod_size, CompLevel_none) nmethod(method(), native_nmethod_size,
502 compile_id, &offsets,
503 code_buffer, frame_size,
504 basic_lock_owner_sp_offset,
505 basic_lock_sp_offset, oop_maps);
506 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_native_nmethod(nm));
507 if ((PrintAssembly || CompilerOracle::should_print(method)) && nm != NULL) {
508 Disassembler::decode(nm);
509 }
510 }
511 // verify nmethod
512 debug_only(if (nm) nm->verify();) // might block
513
514 if (nm != NULL) {
515 nm->log_new_nmethod();
516 }
517
518 return nm;
519 }
520
521 nmethod* nmethod::new_nmethod(methodHandle method,
522 int compile_id,
523 int entry_bci,
524 CodeOffsets* offsets,
525 int orig_pc_offset,
526 DebugInformationRecorder* debug_info,
527 Dependencies* dependencies,
528 CodeBuffer* code_buffer, int frame_size,
529 OopMapSet* oop_maps,
530 ExceptionHandlerTable* handler_table,
531 ImplicitExceptionTable* nul_chk_table,
532 AbstractCompiler* compiler,
533 int comp_level
534 )
535 {
536 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
537 code_buffer->finalize_oop_references(method);
538 // create nmethod
539 nmethod* nm = NULL;
540 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
541 int nmethod_size =
542 allocation_size(code_buffer, sizeof(nmethod))
543 + adjust_pcs_size(debug_info->pcs_size())
544 + round_to(dependencies->size_in_bytes() , oopSize)
545 + round_to(handler_table->size_in_bytes(), oopSize)
546 + round_to(nul_chk_table->size_in_bytes(), oopSize)
547 + round_to(debug_info->data_size() , oopSize);
548
549 nm = new (nmethod_size, comp_level)
550 nmethod(method(), nmethod_size, compile_id, entry_bci, offsets,
551 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size,
552 oop_maps,
553 handler_table,
554 nul_chk_table,
555 compiler,
556 comp_level);
557
558 if (nm != NULL) {
559 // To make dependency checking during class loading fast, record
560 // the nmethod dependencies in the classes it is dependent on.
561 // This allows the dependency checking code to simply walk the
562 // class hierarchy above the loaded class, checking only nmethods
563 // which are dependent on those classes. The slow way is to
564 // check every nmethod for dependencies which makes it linear in
565 // the number of methods compiled. For applications with a lot
566 // classes the slow way is too slow.
567 for (Dependencies::DepStream deps(nm); deps.next(); ) {
568 if (deps.type() == Dependencies::call_site_target_value) {
569 // CallSite dependencies are managed on per-CallSite instance basis.
570 oop call_site = deps.argument_oop(0);
571 MethodHandles::add_dependent_nmethod(call_site, nm);
572 } else {
573 Klass* klass = deps.context_type();
574 if (klass == NULL) {
575 continue; // ignore things like evol_method
576 }
577 // record this nmethod as dependent on this klass
578 InstanceKlass::cast(klass)->add_dependent_nmethod(nm);
579 }
580 }
581 NOT_PRODUCT(nmethod_stats.note_nmethod(nm));
582 if (PrintAssembly || CompilerOracle::has_option_string(method, "PrintAssembly")) {
583 Disassembler::decode(nm);
584 }
585 }
586 }
587 // Do verification and logging outside CodeCache_lock.
588 if (nm != NULL) {
589 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
590 DEBUG_ONLY(nm->verify();)
591 nm->log_new_nmethod();
592 }
593 return nm;
594 }
595
596
597 // For native wrappers
598 nmethod::nmethod(
599 Method* method,
600 int nmethod_size,
601 int compile_id,
602 CodeOffsets* offsets,
603 CodeBuffer* code_buffer,
604 int frame_size,
605 ByteSize basic_lock_owner_sp_offset,
606 ByteSize basic_lock_sp_offset,
607 OopMapSet* oop_maps )
608 : CodeBlob("native nmethod", code_buffer, sizeof(nmethod),
609 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps),
610 _native_receiver_sp_offset(basic_lock_owner_sp_offset),
611 _native_basic_lock_sp_offset(basic_lock_sp_offset)
612 {
613 {
614 debug_only(No_Safepoint_Verifier nsv;)
615 assert_locked_or_safepoint(CodeCache_lock);
616
666 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
667 }
668 // print the header part first
669 print();
670 // then print the requested information
671 if (PrintNativeNMethods) {
672 print_code();
673 if (oop_maps != NULL) {
674 oop_maps->print();
675 }
676 }
677 if (PrintRelocations) {
678 print_relocations();
679 }
680 if (xtty != NULL) {
681 xtty->tail("print_native_nmethod");
682 }
683 }
684 }
685
686 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () {
687 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level));
688 }
689
690 nmethod::nmethod(
691 Method* method,
692 int nmethod_size,
693 int compile_id,
694 int entry_bci,
695 CodeOffsets* offsets,
696 int orig_pc_offset,
697 DebugInformationRecorder* debug_info,
698 Dependencies* dependencies,
699 CodeBuffer *code_buffer,
700 int frame_size,
701 OopMapSet* oop_maps,
702 ExceptionHandlerTable* handler_table,
703 ImplicitExceptionTable* nul_chk_table,
704 AbstractCompiler* compiler,
705 int comp_level
706 )
707 : CodeBlob("nmethod", code_buffer, sizeof(nmethod),
708 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps),
709 _native_receiver_sp_offset(in_ByteSize(-1)),
710 _native_basic_lock_sp_offset(in_ByteSize(-1))
711 {
712 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
713 {
714 debug_only(No_Safepoint_Verifier nsv;)
715 assert_locked_or_safepoint(CodeCache_lock);
716
717 init_defaults();
718 _method = method;
719 _entry_bci = entry_bci;
720 _compile_id = compile_id;
721 _comp_level = comp_level;
722 _compiler = compiler;
723 _orig_pc_offset = orig_pc_offset;
724 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
725
726 // Section offsets
727 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts());
728 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs());
729
730 // Exception handler and deopt handler are in the stub section
731 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set");
732 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set");
733 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
734 _deoptimize_offset = _stub_offset + offsets->value(CodeOffsets::Deopt);
735 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
736 _deoptimize_mh_offset = _stub_offset + offsets->value(CodeOffsets::DeoptMH);
737 } else {
738 _deoptimize_mh_offset = -1;
739 }
740 if (offsets->value(CodeOffsets::UnwindHandler) != -1) {
741 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler);
742 } else {
743 _unwind_handler_offset = -1;
744 }
745
746 _oops_offset = data_offset();
747 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize);
748 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize);
749
750 _scopes_pcs_offset = _scopes_data_offset + round_to(debug_info->data_size (), oopSize);
751 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
752 _handler_table_offset = _dependencies_offset + round_to(dependencies->size_in_bytes (), oopSize);
753 _nul_chk_table_offset = _handler_table_offset + round_to(handler_table->size_in_bytes(), oopSize);
754 _nmethod_end_offset = _nul_chk_table_offset + round_to(nul_chk_table->size_in_bytes(), oopSize);
755
756 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
757 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
758 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry);
762 // Copy contents of ScopeDescRecorder to nmethod
763 code_buffer->copy_values_to(this);
764 debug_info->copy_to(this);
765 dependencies->copy_to(this);
766 if (ScavengeRootsInCode) {
767 if (detect_scavenge_root_oops()) {
768 CodeCache::add_scavenge_root_nmethod(this);
769 }
770 Universe::heap()->register_nmethod(this);
771 }
772 debug_only(verify_scavenge_root_oops());
773
774 CodeCache::commit(this);
775
776 // Copy contents of ExceptionHandlerTable to nmethod
777 handler_table->copy_to(this);
778 nul_chk_table->copy_to(this);
779
780 // we use the information of entry points to find out if a method is
781 // static or non static
782 assert(compiler->is_c2() ||
783 _method->is_static() == (entry_point() == _verified_entry_point),
784 " entry points must be same for static methods and vice versa");
785 }
786
787 bool printnmethods = PrintNMethods
788 || CompilerOracle::should_print(_method)
789 || CompilerOracle::has_option_string(_method, "PrintNMethods");
790 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
791 print_nmethod(printnmethods);
792 }
793 }
794
795
796 // Print a short set of xml attributes to identify this nmethod. The
797 // output should be embedded in some other element.
798 void nmethod::log_identity(xmlStream* log) const {
799 log->print(" compile_id='%d'", compile_id());
800 const char* nm_kind = compile_kind();
801 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind);
802 if (compiler() != NULL) {
803 log->print(" compiler='%s'", compiler()->name());
804 }
805 if (TieredCompilation) {
806 log->print(" level='%d'", comp_level());
807 }
808 }
809
810
811 #define LOG_OFFSET(log, name) \
812 if ((intptr_t)name##_end() - (intptr_t)name##_begin()) \
813 log->print(" " XSTR(name) "_offset='%d'" , \
814 (intptr_t)name##_begin() - (intptr_t)this)
815
816
817 void nmethod::log_new_nmethod() const {
818 if (LogCompilation && xtty != NULL) {
819 ttyLocker ttyl;
820 HandleMark hm;
821 xtty->begin_elem("nmethod");
822 log_identity(xtty);
823 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", code_begin(), size());
824 xtty->print(" address='" INTPTR_FORMAT "'", (intptr_t) this);
825
826 LOG_OFFSET(xtty, relocation);
827 LOG_OFFSET(xtty, consts);
828 LOG_OFFSET(xtty, insts);
829 LOG_OFFSET(xtty, stub);
830 LOG_OFFSET(xtty, scopes_data);
831 LOG_OFFSET(xtty, scopes_pcs);
832 LOG_OFFSET(xtty, dependencies);
833 LOG_OFFSET(xtty, handler_table);
834 LOG_OFFSET(xtty, nul_chk_table);
835 LOG_OFFSET(xtty, oops);
836
837 xtty->method(method());
838 xtty->stamp();
839 xtty->end_elem();
840 }
841 }
842
843 #undef LOG_OFFSET
844
845
846 // Print out more verbose output usually for a newly created nmethod.
847 void nmethod::print_on(outputStream* st, const char* msg) const {
848 if (st != NULL) {
849 ttyLocker ttyl;
850 if (WizardMode) {
851 CompileTask::print_compilation(st, this, msg, /*short_form:*/ true);
852 st->print_cr(" (" INTPTR_FORMAT ")", this);
853 } else {
854 CompileTask::print_compilation(st, this, msg, /*short_form:*/ false);
855 }
857 }
858
859
860 void nmethod::print_nmethod(bool printmethod) {
861 ttyLocker ttyl; // keep the following output all in one block
862 if (xtty != NULL) {
863 xtty->begin_head("print_nmethod");
864 xtty->stamp();
865 xtty->end_head();
866 }
867 // print the header part first
868 print();
869 // then print the requested information
870 if (printmethod) {
871 print_code();
872 print_pcs();
873 if (oop_maps()) {
874 oop_maps()->print();
875 }
876 }
877 if (PrintDebugInfo) {
878 print_scopes();
879 }
880 if (PrintRelocations) {
881 print_relocations();
882 }
883 if (PrintDependencies) {
884 print_dependencies();
885 }
886 if (PrintExceptionHandlers) {
887 print_handler_table();
888 print_nul_chk_table();
889 }
890 if (xtty != NULL) {
891 xtty->tail("print_nmethod");
892 }
893 }
894
895
896 // Promote one word from an assembly-time handle to a live embedded oop.
897 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
898 if (handle == NULL ||
899 // As a special case, IC oops are initialized to 1 or -1.
900 handle == (jobject) Universe::non_oop_word()) {
901 (*dest) = (oop) handle;
902 } else {
903 (*dest) = JNIHandles::resolve_non_null(handle);
973
974
975 void nmethod::verify_oop_relocations() {
976 // Ensure sure that the code matches the current oop values
977 RelocIterator iter(this, NULL, NULL);
978 while (iter.next()) {
979 if (iter.type() == relocInfo::oop_type) {
980 oop_Relocation* reloc = iter.oop_reloc();
981 if (!reloc->oop_is_immediate()) {
982 reloc->verify_oop_relocation();
983 }
984 }
985 }
986 }
987
988
989 ScopeDesc* nmethod::scope_desc_at(address pc) {
990 PcDesc* pd = pc_desc_at(pc);
991 guarantee(pd != NULL, "scope must be present");
992 return new ScopeDesc(this, pd->scope_decode_offset(),
993 pd->obj_decode_offset(), pd->should_reexecute(),
994 pd->return_oop());
995 }
996
997
998 void nmethod::clear_inline_caches() {
999 assert(SafepointSynchronize::is_at_safepoint(), "cleaning of IC's only allowed at safepoint");
1000 if (is_zombie()) {
1001 return;
1002 }
1003
1004 RelocIterator iter(this);
1005 while (iter.next()) {
1006 iter.reloc()->clear_inline_cache();
1007 }
1008 }
1009
1010 // Clear ICStubs of all compiled ICs
1011 void nmethod::clear_ic_stubs() {
1012 assert_locked_or_safepoint(CompiledIC_lock);
1013 RelocIterator iter(this);
1144 assert(is_alive(), "Must be an alive method");
1145 // Set the traversal mark to ensure that the sweeper does 2
1146 // cleaning passes before moving to zombie.
1147 set_stack_traversal_mark(NMethodSweeper::traversal_count());
1148 }
1149
1150 // Tell if a non-entrant method can be converted to a zombie (i.e.,
1151 // there are no activations on the stack, not in use by the VM,
1152 // and not in use by the ServiceThread)
1153 bool nmethod::can_not_entrant_be_converted() {
1154 assert(is_not_entrant(), "must be a non-entrant method");
1155
1156 // Since the nmethod sweeper only does partial sweep the sweeper's traversal
1157 // count can be greater than the stack traversal count before it hits the
1158 // nmethod for the second time.
1159 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count() &&
1160 !is_locked_by_vm();
1161 }
1162
1163 void nmethod::inc_decompile_count() {
1164 if (!is_compiled_by_c2()) return;
1165 // Could be gated by ProfileTraps, but do not bother...
1166 Method* m = method();
1167 if (m == NULL) return;
1168 MethodData* mdo = m->method_data();
1169 if (mdo == NULL) return;
1170 // There is a benign race here. See comments in methodData.hpp.
1171 mdo->inc_decompile_count();
1172 }
1173
1174 void nmethod::increase_unloading_clock() {
1175 _global_unloading_clock++;
1176 if (_global_unloading_clock == 0) {
1177 // _nmethods are allocated with _unloading_clock == 0,
1178 // so 0 is never used as a clock value.
1179 _global_unloading_clock = 1;
1180 }
1181 }
1182
1183 void nmethod::set_unloading_clock(unsigned char unloading_clock) {
1184 OrderAccess::release_store((volatile jubyte*)&_unloading_clock, unloading_clock);
1208 this, (address)_method, (address)cause);
1209 if (!Universe::heap()->is_gc_active())
1210 cause->klass()->print();
1211 }
1212 // Unlink the osr method, so we do not look this up again
1213 if (is_osr_method()) {
1214 invalidate_osr_method();
1215 }
1216 // If _method is already NULL the Method* is about to be unloaded,
1217 // so we don't have to break the cycle. Note that it is possible to
1218 // have the Method* live here, in case we unload the nmethod because
1219 // it is pointing to some oop (other than the Method*) being unloaded.
1220 if (_method != NULL) {
1221 // OSR methods point to the Method*, but the Method* does not
1222 // point back!
1223 if (_method->code() == this) {
1224 _method->clear_code(); // Break a cycle
1225 }
1226 _method = NULL; // Clear the method of this dead nmethod
1227 }
1228 // Make the class unloaded - i.e., change state and notify sweeper
1229 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
1230 if (is_in_use()) {
1231 // Transitioning directly from live to unloaded -- so
1232 // we need to force a cache clean-up; remember this
1233 // for later on.
1234 CodeCache::set_needs_cache_clean(true);
1235 }
1236
1237 // Unregister must be done before the state change
1238 Universe::heap()->unregister_nmethod(this);
1239
1240 _state = unloaded;
1241
1242 // Log the unloading.
1243 log_state_change();
1244
1245 // The Method* is gone at this point
1246 assert(_method == NULL, "Tautology");
1247
1248 set_osr_link(NULL);
1249 //set_scavenge_root_link(NULL); // done by prune_scavenge_root_nmethods
1250 NMethodSweeper::report_state_change(this);
1251 }
1252
1253 void nmethod::invalidate_osr_method() {
1254 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
1255 // Remove from list of active nmethods
1256 if (method() != NULL)
1257 method()->method_holder()->remove_osr_nmethod(this);
1258 }
1259
1383 }
1384
1385 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload
1386 // event and it hasn't already been reported for this nmethod then
1387 // report it now. The event may have been reported earilier if the GC
1388 // marked it for unloading). JvmtiDeferredEventQueue support means
1389 // we no longer go to a safepoint here.
1390 post_compiled_method_unload();
1391
1392 #ifdef ASSERT
1393 // It's no longer safe to access the oops section since zombie
1394 // nmethods aren't scanned for GC.
1395 _oops_are_stale = true;
1396 #endif
1397 // the Method may be reclaimed by class unloading now that the
1398 // nmethod is in zombie state
1399 set_method(NULL);
1400 } else {
1401 assert(state == not_entrant, "other cases may need to be handled differently");
1402 }
1403
1404 if (TraceCreateZombies) {
1405 tty->print_cr("nmethod <" INTPTR_FORMAT "> code made %s", this, (state == not_entrant) ? "not entrant" : "zombie");
1406 }
1407
1408 NMethodSweeper::report_state_change(this);
1409 return true;
1410 }
1411
1412 void nmethod::flush() {
1413 // Note that there are no valid oops in the nmethod anymore.
1414 assert(is_zombie() || (is_osr_method() && is_unloaded()), "must be a zombie method");
1415 assert(is_marked_for_reclamation() || (is_osr_method() && is_unloaded()), "must be marked for reclamation");
1416
1417 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed");
1418 assert_locked_or_safepoint(CodeCache_lock);
1419
1420 // completely deallocate this method
1421 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, this);
1422 if (PrintMethodFlushing) {
1423 tty->print_cr("*flushing nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT "/Free CodeCache:" SIZE_FORMAT "Kb",
1424 _compile_id, this, CodeCache::nof_blobs(), CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024);
1425 }
1673 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1674 "oop must be found in exactly one place");
1675 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1676 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) {
1677 return;
1678 }
1679 }
1680 }
1681 }
1682 }
1683
1684
1685 // Scopes
1686 for (oop* p = oops_begin(); p < oops_end(); p++) {
1687 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1688 if (can_unload(is_alive, p, unloading_occurred)) {
1689 return;
1690 }
1691 }
1692
1693 // Ensure that all metadata is still alive
1694 verify_metadata_loaders(low_boundary, is_alive);
1695 }
1696
1697 template <class CompiledICorStaticCall>
1698 static bool clean_if_nmethod_is_unloaded(CompiledICorStaticCall *ic, address addr, BoolObjectClosure *is_alive, nmethod* from) {
1699 // Ok, to lookup references to zombies here
1700 CodeBlob *cb = CodeCache::find_blob_unsafe(addr);
1701 if (cb != NULL && cb->is_nmethod()) {
1702 nmethod* nm = (nmethod*)cb;
1703
1704 if (nm->unloading_clock() != nmethod::global_unloading_clock()) {
1705 // The nmethod has not been processed yet.
1706 return true;
1707 }
1708
1709 // Clean inline caches pointing to both zombie and not_entrant methods
1710 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1711 ic->set_to_clean();
1712 assert(ic->is_clean(), err_msg("nmethod " PTR_FORMAT "not clean %s", from, from->method()->name_and_sig_as_C_string()));
1755 // first few bytes. If an oop in the old code was there, that oop
1756 // should not get GC'd. Skip the first few bytes of oops on
1757 // not-entrant methods.
1758 address low_boundary = verified_entry_point();
1759 if (is_not_entrant()) {
1760 low_boundary += NativeJump::instruction_size;
1761 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1762 // (See comment above.)
1763 }
1764
1765 // The RedefineClasses() API can cause the class unloading invariant
1766 // to no longer be true. See jvmtiExport.hpp for details.
1767 // Also, leave a debugging breadcrumb in local flag.
1768 if (JvmtiExport::has_redefined_a_class()) {
1769 // This set of the unloading_occurred flag is done before the
1770 // call to post_compiled_method_unload() so that the unloading
1771 // of this nmethod is reported.
1772 unloading_occurred = true;
1773 }
1774
1775 // Exception cache
1776 clean_exception_cache(is_alive);
1777
1778 bool is_unloaded = false;
1779 bool postponed = false;
1780
1781 RelocIterator iter(this, low_boundary);
1782 while(iter.next()) {
1783
1784 switch (iter.type()) {
1785
1786 case relocInfo::virtual_call_type:
1787 if (unloading_occurred) {
1788 // If class unloading occurred we first iterate over all inline caches and
1789 // clear ICs where the cached oop is referring to an unloaded klass or method.
1790 clean_ic_if_metadata_is_dead(CompiledIC_at(&iter), is_alive);
1791 }
1792
1793 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
1794 break;
1812 }
1813 }
1814
1815 if (is_unloaded) {
1816 return postponed;
1817 }
1818
1819 // Scopes
1820 for (oop* p = oops_begin(); p < oops_end(); p++) {
1821 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1822 if (can_unload(is_alive, p, unloading_occurred)) {
1823 is_unloaded = true;
1824 break;
1825 }
1826 }
1827
1828 if (is_unloaded) {
1829 return postponed;
1830 }
1831
1832 // Ensure that all metadata is still alive
1833 verify_metadata_loaders(low_boundary, is_alive);
1834
1835 return postponed;
1836 }
1837
1838 void nmethod::do_unloading_parallel_postponed(BoolObjectClosure* is_alive, bool unloading_occurred) {
1839 ResourceMark rm;
1840
1841 // Make sure the oop's ready to receive visitors
1842 assert(!is_zombie(),
1843 "should not call follow on zombie nmethod");
1844
1845 // If the method is not entrant then a JMP is plastered over the
1846 // first few bytes. If an oop in the old code was there, that oop
1847 // should not get GC'd. Skip the first few bytes of oops on
1848 // not-entrant methods.
1849 address low_boundary = verified_entry_point();
1850 if (is_not_entrant()) {
1851 low_boundary += NativeJump::instruction_size;
1996 // Visit metadata not embedded in the other places.
1997 if (_method != NULL) f(_method);
1998 }
1999
2000 void nmethod::oops_do(OopClosure* f, bool allow_zombie) {
2001 // make sure the oops ready to receive visitors
2002 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod");
2003 assert(!is_unloaded(), "should not call follow on unloaded nmethod");
2004
2005 // If the method is not entrant or zombie then a JMP is plastered over the
2006 // first few bytes. If an oop in the old code was there, that oop
2007 // should not get GC'd. Skip the first few bytes of oops on
2008 // not-entrant methods.
2009 address low_boundary = verified_entry_point();
2010 if (is_not_entrant()) {
2011 low_boundary += NativeJump::instruction_size;
2012 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
2013 // (See comment above.)
2014 }
2015
2016 RelocIterator iter(this, low_boundary);
2017
2018 while (iter.next()) {
2019 if (iter.type() == relocInfo::oop_type ) {
2020 oop_Relocation* r = iter.oop_reloc();
2021 // In this loop, we must only follow those oops directly embedded in
2022 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
2023 assert(1 == (r->oop_is_immediate()) +
2024 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
2025 "oop must be found in exactly one place");
2026 if (r->oop_is_immediate() && r->oop_value() != NULL) {
2027 f->do_oop(r->oop_addr());
2028 }
2029 }
2030 }
2031
2032 // Scopes
2033 // This includes oop constants not inlined in the code stream.
2034 for (oop* p = oops_begin(); p < oops_end(); p++) {
2035 if (*p == Universe::non_oop_word()) continue; // skip non-oops
2120 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root");
2121 tty->print_cr("" PTR_FORMAT "[offset=%d] detected scavengable oop " PTR_FORMAT " (found at " PTR_FORMAT ")",
2122 _print_nm, (int)((intptr_t)p - (intptr_t)_print_nm),
2123 (void *)(*p), (intptr_t)p);
2124 (*p)->print();
2125 }
2126 #endif //PRODUCT
2127 };
2128
2129 bool nmethod::detect_scavenge_root_oops() {
2130 DetectScavengeRoot detect_scavenge_root;
2131 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this);
2132 oops_do(&detect_scavenge_root);
2133 return detect_scavenge_root.detected_scavenge_root();
2134 }
2135
2136 // Method that knows how to preserve outgoing arguments at call. This method must be
2137 // called with a frame corresponding to a Java invoke
2138 void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) {
2139 #ifndef SHARK
2140 if (!method()->is_native()) {
2141 SimpleScopeDesc ssd(this, fr.pc());
2142 Bytecode_invoke call(ssd.method(), ssd.bci());
2143 bool has_receiver = call.has_receiver();
2144 bool has_appendix = call.has_appendix();
2145 Symbol* signature = call.signature();
2146 fr.oops_compiled_arguments_do(signature, has_receiver, has_appendix, reg_map, f);
2147 }
2148 #endif // !SHARK
2149 }
2150
2151 inline bool includes(void* p, void* from, void* to) {
2152 return from <= p && p < to;
2153 }
2154
2155
2156 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
2157 assert(count >= 2, "must be sentinel values, at least");
2158
2159 #ifdef ASSERT
2160 // must be sorted and unique; we do a binary search in find_pc_desc()
2186 // Adjust the final sentinel downward.
2187 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
2188 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
2189 last_pc->set_pc_offset(content_size() + 1);
2190 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
2191 // Fill any rounding gaps with copies of the last record.
2192 last_pc[1] = last_pc[0];
2193 }
2194 // The following assert could fail if sizeof(PcDesc) is not
2195 // an integral multiple of oopSize (the rounding term).
2196 // If it fails, change the logic to always allocate a multiple
2197 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
2198 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
2199 }
2200
2201 void nmethod::copy_scopes_data(u_char* buffer, int size) {
2202 assert(scopes_data_size() >= size, "oob");
2203 memcpy(scopes_data_begin(), buffer, size);
2204 }
2205
2206
2207 #ifdef ASSERT
2208 static PcDesc* linear_search(nmethod* nm, int pc_offset, bool approximate) {
2209 PcDesc* lower = nm->scopes_pcs_begin();
2210 PcDesc* upper = nm->scopes_pcs_end();
2211 lower += 1; // exclude initial sentinel
2212 PcDesc* res = NULL;
2213 for (PcDesc* p = lower; p < upper; p++) {
2214 NOT_PRODUCT(--nmethod_stats.pc_desc_tests); // don't count this call to match_desc
2215 if (match_desc(p, pc_offset, approximate)) {
2216 if (res == NULL)
2217 res = p;
2218 else
2219 res = (PcDesc*) badAddress;
2220 }
2221 }
2222 return res;
2223 }
2224 #endif
2225
2226
2227 // Finds a PcDesc with real-pc equal to "pc"
2228 PcDesc* nmethod::find_pc_desc_internal(address pc, bool approximate) {
2229 address base_address = code_begin();
2230 if ((pc < base_address) ||
2231 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
2232 return NULL; // PC is wildly out of range
2233 }
2234 int pc_offset = (int) (pc - base_address);
2241 return res;
2242 }
2243
2244 // Fallback algorithm: quasi-linear search for the PcDesc
2245 // Find the last pc_offset less than the given offset.
2246 // The successor must be the required match, if there is a match at all.
2247 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
2248 PcDesc* lower = scopes_pcs_begin();
2249 PcDesc* upper = scopes_pcs_end();
2250 upper -= 1; // exclude final sentinel
2251 if (lower >= upper) return NULL; // native method; no PcDescs at all
2252
2253 #define assert_LU_OK \
2254 /* invariant on lower..upper during the following search: */ \
2255 assert(lower->pc_offset() < pc_offset, "sanity"); \
2256 assert(upper->pc_offset() >= pc_offset, "sanity")
2257 assert_LU_OK;
2258
2259 // Use the last successful return as a split point.
2260 PcDesc* mid = _pc_desc_cache.last_pc_desc();
2261 NOT_PRODUCT(++nmethod_stats.pc_desc_searches);
2262 if (mid->pc_offset() < pc_offset) {
2263 lower = mid;
2264 } else {
2265 upper = mid;
2266 }
2267
2268 // Take giant steps at first (4096, then 256, then 16, then 1)
2269 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
2270 const int RADIX = (1 << LOG2_RADIX);
2271 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
2272 while ((mid = lower + step) < upper) {
2273 assert_LU_OK;
2274 NOT_PRODUCT(++nmethod_stats.pc_desc_searches);
2275 if (mid->pc_offset() < pc_offset) {
2276 lower = mid;
2277 } else {
2278 upper = mid;
2279 break;
2280 }
2281 }
2282 assert_LU_OK;
2283 }
2284
2285 // Sneak up on the value with a linear search of length ~16.
2286 while (true) {
2287 assert_LU_OK;
2288 mid = lower + 1;
2289 NOT_PRODUCT(++nmethod_stats.pc_desc_searches);
2290 if (mid->pc_offset() < pc_offset) {
2291 lower = mid;
2292 } else {
2293 upper = mid;
2294 break;
2295 }
2296 }
2297 #undef assert_LU_OK
2298
2299 if (match_desc(upper, pc_offset, approximate)) {
2300 assert(upper == linear_search(this, pc_offset, approximate), "search ok");
2301 _pc_desc_cache.add_pc_desc(upper);
2302 return upper;
2303 } else {
2304 assert(NULL == linear_search(this, pc_offset, approximate), "search ok");
2305 return NULL;
2306 }
2307 }
2308
2309
2456 CodeBlob* cb = CodeCache::find_blob(pc);
2457 guarantee(cb != NULL && cb->is_nmethod(), "bad pc for a nmethod found");
2458 _nm = (nmethod*)cb;
2459 lock_nmethod(_nm);
2460 }
2461
2462 // Only JvmtiDeferredEvent::compiled_method_unload_event()
2463 // should pass zombie_ok == true.
2464 void nmethodLocker::lock_nmethod(nmethod* nm, bool zombie_ok) {
2465 if (nm == NULL) return;
2466 Atomic::inc(&nm->_lock_count);
2467 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method");
2468 }
2469
2470 void nmethodLocker::unlock_nmethod(nmethod* nm) {
2471 if (nm == NULL) return;
2472 Atomic::dec(&nm->_lock_count);
2473 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock");
2474 }
2475
2476
2477 // -----------------------------------------------------------------------------
2478 // nmethod::get_deopt_original_pc
2479 //
2480 // Return the original PC for the given PC if:
2481 // (a) the given PC belongs to a nmethod and
2482 // (b) it is a deopt PC
2483 address nmethod::get_deopt_original_pc(const frame* fr) {
2484 if (fr->cb() == NULL) return NULL;
2485
2486 nmethod* nm = fr->cb()->as_nmethod_or_null();
2487 if (nm != NULL && nm->is_deopt_pc(fr->pc()))
2488 return nm->get_original_pc(fr);
2489
2490 return NULL;
2491 }
2492
2493
2494 // -----------------------------------------------------------------------------
2495 // MethodHandle
2496
2570 void nmethod::verify_interrupt_point(address call_site) {
2571 // Verify IC only when nmethod installation is finished.
2572 bool is_installed = (method()->code() == this) // nmethod is in state 'in_use' and installed
2573 || !this->is_in_use(); // nmethod is installed, but not in 'in_use' state
2574 if (is_installed) {
2575 Thread *cur = Thread::current();
2576 if (CompiledIC_lock->owner() == cur ||
2577 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) &&
2578 SafepointSynchronize::is_at_safepoint())) {
2579 CompiledIC_at(this, call_site);
2580 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
2581 } else {
2582 MutexLocker ml_verify (CompiledIC_lock);
2583 CompiledIC_at(this, call_site);
2584 }
2585 }
2586
2587 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address());
2588 assert(pd != NULL, "PcDesc must exist");
2589 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(),
2590 pd->obj_decode_offset(), pd->should_reexecute(),
2591 pd->return_oop());
2592 !sd->is_top(); sd = sd->sender()) {
2593 sd->verify();
2594 }
2595 }
2596
2597 void nmethod::verify_scopes() {
2598 if( !method() ) return; // Runtime stubs have no scope
2599 if (method()->is_native()) return; // Ignore stub methods.
2600 // iterate through all interrupt point
2601 // and verify the debug information is valid.
2602 RelocIterator iter((nmethod*)this);
2603 while (iter.next()) {
2604 address stub = NULL;
2605 switch (iter.type()) {
2606 case relocInfo::virtual_call_type:
2607 verify_interrupt_point(iter.addr());
2608 break;
2609 case relocInfo::opt_virtual_call_type:
2610 stub = iter.opt_virtual_call_reloc()->static_stub();
2663 }
2664 assert(scavenge_root_not_marked(), "");
2665 }
2666
2667 #endif // PRODUCT
2668
2669 // Printing operations
2670
2671 void nmethod::print() const {
2672 ResourceMark rm;
2673 ttyLocker ttyl; // keep the following output all in one block
2674
2675 tty->print("Compiled method ");
2676
2677 if (is_compiled_by_c1()) {
2678 tty->print("(c1) ");
2679 } else if (is_compiled_by_c2()) {
2680 tty->print("(c2) ");
2681 } else if (is_compiled_by_shark()) {
2682 tty->print("(shark) ");
2683 } else {
2684 tty->print("(nm) ");
2685 }
2686
2687 print_on(tty, NULL);
2688
2689 if (WizardMode) {
2690 tty->print("((nmethod*) " INTPTR_FORMAT ") ", this);
2691 tty->print(" for method " INTPTR_FORMAT , (address)method());
2692 tty->print(" { ");
2693 if (is_in_use()) tty->print("in_use ");
2694 if (is_not_entrant()) tty->print("not_entrant ");
2695 if (is_zombie()) tty->print("zombie ");
2696 if (is_unloaded()) tty->print("unloaded ");
2697 if (on_scavenge_root_list()) tty->print("scavenge_root ");
2698 tty->print_cr("}:");
2699 }
2700 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2701 (address)this,
2702 (address)this + size(),
2747 nul_chk_table_size());
2748 }
2749
2750 void nmethod::print_code() {
2751 HandleMark hm;
2752 ResourceMark m;
2753 Disassembler::decode(this);
2754 }
2755
2756
2757 #ifndef PRODUCT
2758
2759 void nmethod::print_scopes() {
2760 // Find the first pc desc for all scopes in the code and print it.
2761 ResourceMark rm;
2762 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2763 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
2764 continue;
2765
2766 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
2767 sd->print_on(tty, p);
2768 }
2769 }
2770
2771 void nmethod::print_dependencies() {
2772 ResourceMark rm;
2773 ttyLocker ttyl; // keep the following output all in one block
2774 tty->print_cr("Dependencies:");
2775 for (Dependencies::DepStream deps(this); deps.next(); ) {
2776 deps.print_dependency();
2777 Klass* ctxk = deps.context_type();
2778 if (ctxk != NULL) {
2779 if (ctxk->oop_is_instance() && ((InstanceKlass*)ctxk)->is_dependent_nmethod(this)) {
2780 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name());
2781 }
2782 }
2783 deps.log_dependency(); // put it into the xml log also
2784 }
2785 }
2786
2787
2864 case relocInfo::virtual_call_type: return "virtual_call";
2865 case relocInfo::opt_virtual_call_type: return "optimized virtual_call";
2866 case relocInfo::static_call_type: return "static_call";
2867 case relocInfo::static_stub_type: return "static_stub";
2868 case relocInfo::external_word_type: return "external_word";
2869 case relocInfo::internal_word_type: return "internal_word";
2870 case relocInfo::section_word_type: return "section_word";
2871 case relocInfo::poll_type: return "poll";
2872 case relocInfo::poll_return_type: return "poll_return";
2873 case relocInfo::type_mask: return "type_bit_mask";
2874 }
2875 }
2876 return have_one ? "other" : NULL;
2877 }
2878
2879 // Return a the last scope in (begin..end]
2880 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
2881 PcDesc* p = pc_desc_near(begin+1);
2882 if (p != NULL && p->real_pc(this) <= end) {
2883 return new ScopeDesc(this, p->scope_decode_offset(),
2884 p->obj_decode_offset(), p->should_reexecute(),
2885 p->return_oop());
2886 }
2887 return NULL;
2888 }
2889
2890 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const {
2891 if (block_begin == entry_point()) stream->print_cr("[Entry Point]");
2892 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]");
2893 if (block_begin == exception_begin()) stream->print_cr("[Exception Handler]");
2894 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]");
2895 if (block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]");
2896
2897 if (has_method_handle_invokes())
2898 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]");
2899
2900 if (block_begin == consts_begin()) stream->print_cr("[Constants]");
2901
2902 if (block_begin == entry_point()) {
2903 methodHandle m = method();
2904 if (m.not_null()) {
2905 stream->print(" # ");
2906 m->print_value_on(stream);
2907 stream->cr();
2908 }
2909 if (m.not_null() && !is_osr_method()) {
2910 ResourceMark rm;
2911 int sizeargs = m->size_of_parameters();
2912 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
2913 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
2914 {
2915 int sig_index = 0;
3041 if (invoke.name() != NULL)
3042 invoke.name()->print_symbol_on(st);
3043 else
3044 st->print("<UNKNOWN>");
3045 break;
3046 }
3047 case Bytecodes::_getfield:
3048 case Bytecodes::_putfield:
3049 case Bytecodes::_getstatic:
3050 case Bytecodes::_putstatic:
3051 {
3052 Bytecode_field field(sd->method(), sd->bci());
3053 st->print(" ");
3054 if (field.name() != NULL)
3055 field.name()->print_symbol_on(st);
3056 else
3057 st->print("<UNKNOWN>");
3058 }
3059 }
3060 }
3061 }
3062
3063 // Print all scopes
3064 for (;sd != NULL; sd = sd->sender()) {
3065 st->move_to(column);
3066 st->print("; -");
3067 if (sd->method() == NULL) {
3068 st->print("method is NULL");
3069 } else {
3070 sd->method()->print_short_name(st);
3071 }
3072 int lineno = sd->method()->line_number_from_bci(sd->bci());
3073 if (lineno != -1) {
3074 st->print("@%d (line %d)", sd->bci(), lineno);
3075 } else {
3076 st->print("@%d", sd->bci());
3077 }
3078 st->cr();
3079 }
3080 }
3113 }
3114 case relocInfo::static_call_type:
3115 st->print_cr("Static call at " INTPTR_FORMAT, iter.reloc()->addr());
3116 compiledStaticCall_at(iter.reloc())->print();
3117 break;
3118 }
3119 }
3120 }
3121
3122 void nmethod::print_handler_table() {
3123 ExceptionHandlerTable(this).print();
3124 }
3125
3126 void nmethod::print_nul_chk_table() {
3127 ImplicitExceptionTable(this).print(code_begin());
3128 }
3129
3130 void nmethod::print_statistics() {
3131 ttyLocker ttyl;
3132 if (xtty != NULL) xtty->head("statistics type='nmethod'");
3133 nmethod_stats.print_native_nmethod_stats();
3134 nmethod_stats.print_nmethod_stats();
3135 DebugInformationRecorder::print_statistics();
3136 nmethod_stats.print_pc_stats();
3137 Dependencies::print_statistics();
3138 if (xtty != NULL) xtty->tail("statistics");
3139 }
3140
3141 #endif // PRODUCT
|
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "code/codeCache.hpp"
27 #include "code/compiledIC.hpp"
28 #include "code/dependencies.hpp"
29 #include "code/nativeInst.hpp"
30 #include "code/nmethod.hpp"
31 #include "code/scopeDesc.hpp"
32 #include "compiler/abstractCompiler.hpp"
33 #include "compiler/compileBroker.hpp"
34 #include "compiler/compileLog.hpp"
35 #include "compiler/compilerOracle.hpp"
36 #include "compiler/disassembler.hpp"
37 #include "interpreter/bytecode.hpp"
38 #include "oops/methodData.hpp"
39 #include "oops/oop.inline.hpp"
40 #include "prims/jvmtiRedefineClassesTrace.hpp"
41 #include "prims/jvmtiImpl.hpp"
42 #include "runtime/atomic.inline.hpp"
43 #include "runtime/orderAccess.inline.hpp"
44 #include "runtime/sharedRuntime.hpp"
45 #include "runtime/sweeper.hpp"
46 #include "utilities/resourceHash.hpp"
47 #include "utilities/dtrace.hpp"
48 #include "utilities/events.hpp"
49 #include "utilities/xmlstream.hpp"
50 #ifdef TARGET_ARCH_x86
51 # include "nativeInst_x86.hpp"
52 #endif
53 #ifdef TARGET_ARCH_sparc
54 # include "nativeInst_sparc.hpp"
55 #endif
56 #ifdef TARGET_ARCH_zero
57 # include "nativeInst_zero.hpp"
58 #endif
59 #ifdef TARGET_ARCH_arm
60 # include "nativeInst_arm.hpp"
61 #endif
62 #ifdef TARGET_ARCH_ppc
63 # include "nativeInst_ppc.hpp"
64 #endif
65 #ifdef SHARK
66 #include "shark/sharkCompiler.hpp"
67 #endif
68 #if INCLUDE_JVMCI
69 #include "jvmci/jvmciJavaClasses.hpp"
70 #endif
71
72 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
73
74 unsigned char nmethod::_global_unloading_clock = 0;
75
76 #ifdef DTRACE_ENABLED
77
78 // Only bother with this argument setup if dtrace is available
79
80 #define DTRACE_METHOD_UNLOAD_PROBE(method) \
81 { \
82 Method* m = (method); \
83 if (m != NULL) { \
84 Symbol* klass_name = m->klass_name(); \
85 Symbol* name = m->name(); \
86 Symbol* signature = m->signature(); \
87 HOTSPOT_COMPILED_METHOD_UNLOAD( \
88 (char *) klass_name->bytes(), klass_name->utf8_length(), \
89 (char *) name->bytes(), name->utf8_length(), \
90 (char *) signature->bytes(), signature->utf8_length()); \
91 } \
92 }
93
94 #else // ndef DTRACE_ENABLED
95
96 #define DTRACE_METHOD_UNLOAD_PROBE(method)
97
98 #endif
99
100 bool nmethod::is_compiled_by_c1() const {
101 if (compiler() == NULL) {
102 return false;
103 }
104 return compiler()->is_c1();
105 }
106 bool nmethod::is_compiled_by_jvmci() const {
107 if (compiler() == NULL || method() == NULL) return false; // can happen during debug printing
108 if (is_native_method()) return false;
109 return compiler()->is_jvmci();
110 }
111 bool nmethod::is_compiled_by_c2() const {
112 if (compiler() == NULL) {
113 return false;
114 }
115 return compiler()->is_c2();
116 }
117 bool nmethod::is_compiled_by_shark() const {
118 if (compiler() == NULL) {
119 return false;
120 }
121 return compiler()->is_shark();
122 }
123
124
125
126 //---------------------------------------------------------------------------------
127 // NMethod statistics
128 // They are printed under various flags, including:
129 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation.
130 // (In the latter two cases, they like other stats are printed to the log only.)
131
132 #ifndef PRODUCT
133 // These variables are put into one block to reduce relocations
134 // and make it simpler to print from the debugger.
135 struct java_nmethod_stats_struct {
136 int nmethod_count;
137 int total_size;
138 int relocation_size;
139 int consts_size;
140 int insts_size;
141 int stub_size;
142 int scopes_data_size;
143 int scopes_pcs_size;
144 int dependencies_size;
145 int handler_table_size;
146 int nul_chk_table_size;
147 int oops_size;
148 int metadata_size;
149
150 void note_nmethod(nmethod* nm) {
151 nmethod_count += 1;
152 total_size += nm->size();
153 relocation_size += nm->relocation_size();
154 consts_size += nm->consts_size();
155 insts_size += nm->insts_size();
156 stub_size += nm->stub_size();
157 oops_size += nm->oops_size();
158 metadata_size += nm->metadata_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(const char* name) {
166 if (nmethod_count == 0) return;
167 tty->print_cr("Statistics for %d bytecoded nmethods for %s:", nmethod_count, name);
168 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size);
169 if (nmethod_count != 0) tty->print_cr(" header = %d", nmethod_count * sizeof(nmethod));
170 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size);
171 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size);
172 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size);
173 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size);
174 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size);
175 if (metadata_size != 0) tty->print_cr(" metadata = %d", metadata_size);
176 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size);
177 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size);
178 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size);
179 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size);
180 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size);
181 }
182 };
183
184 struct native_nmethod_stats_struct {
185 int native_nmethod_count;
186 int native_total_size;
187 int native_relocation_size;
188 int native_insts_size;
189 int native_oops_size;
190 int native_metadata_size;
191 void note_native_nmethod(nmethod* nm) {
192 native_nmethod_count += 1;
193 native_total_size += nm->size();
194 native_relocation_size += nm->relocation_size();
195 native_insts_size += nm->insts_size();
196 native_oops_size += nm->oops_size();
197 native_metadata_size += nm->metadata_size();
198 }
199 void print_native_nmethod_stats() {
200 if (native_nmethod_count == 0) return;
201 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count);
202 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size);
203 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size);
204 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size);
205 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size);
206 if (native_metadata_size != 0) tty->print_cr(" N. metadata = %d", native_metadata_size);
207 }
208 };
209
210 struct pc_nmethod_stats_struct {
211 int pc_desc_resets; // number of resets (= number of caches)
212 int pc_desc_queries; // queries to nmethod::find_pc_desc
213 int pc_desc_approx; // number of those which have approximate true
214 int pc_desc_repeats; // number of _pc_descs[0] hits
215 int pc_desc_hits; // number of LRU cache hits
216 int pc_desc_tests; // total number of PcDesc examinations
217 int pc_desc_searches; // total number of quasi-binary search steps
218 int pc_desc_adds; // number of LUR cache insertions
219
220 void print_pc_stats() {
221 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query",
222 pc_desc_queries,
223 (double)(pc_desc_tests + pc_desc_searches)
224 / pc_desc_queries);
225 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d",
226 pc_desc_resets,
227 pc_desc_queries, pc_desc_approx,
228 pc_desc_repeats, pc_desc_hits,
229 pc_desc_tests, pc_desc_searches, pc_desc_adds);
230 }
231 };
232
233 #ifdef COMPILER1
234 static java_nmethod_stats_struct c1_java_nmethod_stats;
235 #endif
236 #ifdef COMPILER2
237 static java_nmethod_stats_struct c2_java_nmethod_stats;
238 #endif
239 #if INCLUDE_JVMCI
240 static java_nmethod_stats_struct jvmci_java_nmethod_stats;
241 #endif
242 #ifdef SHARK
243 static java_nmethod_stats_struct shark_java_nmethod_stats;
244 #endif
245 static java_nmethod_stats_struct unknown_java_nmethod_stats;
246
247 static native_nmethod_stats_struct native_nmethod_stats;
248 static pc_nmethod_stats_struct pc_nmethod_stats;
249
250 static void note_java_nmethod(nmethod* nm) {
251 #ifdef COMPILER1
252 if (nm->is_compiled_by_c1()) {
253 c1_java_nmethod_stats.note_nmethod(nm);
254 } else
255 #endif
256 #ifdef COMPILER2
257 if (nm->is_compiled_by_c2()) {
258 c2_java_nmethod_stats.note_nmethod(nm);
259 } else
260 #endif
261 #if INCLUDE_JVMCI
262 if (nm->is_compiled_by_jvmci()) {
263 jvmci_java_nmethod_stats.note_nmethod(nm);
264 } else
265 #endif
266 #ifdef SHARK
267 if (nm->is_compiled_by_shark()) {
268 shark_java_nmethod_stats.note_nmethod(nm);
269 } else
270 #endif
271 {
272 unknown_java_nmethod_stats.note_nmethod(nm);
273 }
274 }
275 #endif // !PRODUCT
276
277 //---------------------------------------------------------------------------------
278
279
280 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) {
281 assert(pc != NULL, "Must be non null");
282 assert(exception.not_null(), "Must be non null");
283 assert(handler != NULL, "Must be non null");
284
285 _count = 0;
286 _exception_type = exception->klass();
287 _next = NULL;
288
289 add_address_and_handler(pc,handler);
290 }
291
292
293 address ExceptionCache::match(Handle exception, address pc) {
294 assert(pc != NULL,"Must be non null");
295 assert(exception.not_null(),"Must be non null");
335 // private method for handling exception cache
336 // These methods are private, and used to manipulate the exception cache
337 // directly.
338 ExceptionCache* nmethod::exception_cache_entry_for_exception(Handle exception) {
339 ExceptionCache* ec = exception_cache();
340 while (ec != NULL) {
341 if (ec->match_exception_with_space(exception)) {
342 return ec;
343 }
344 ec = ec->next();
345 }
346 return NULL;
347 }
348
349
350 //-----------------------------------------------------------------------------
351
352
353 // Helper used by both find_pc_desc methods.
354 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) {
355 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_tests);
356 if (!approximate)
357 return pc->pc_offset() == pc_offset;
358 else
359 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset();
360 }
361
362 void PcDescCache::reset_to(PcDesc* initial_pc_desc) {
363 if (initial_pc_desc == NULL) {
364 _pc_descs[0] = NULL; // native method; no PcDescs at all
365 return;
366 }
367 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_resets);
368 // reset the cache by filling it with benign (non-null) values
369 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel");
370 for (int i = 0; i < cache_size; i++)
371 _pc_descs[i] = initial_pc_desc;
372 }
373
374 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) {
375 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_queries);
376 NOT_PRODUCT(if (approximate) ++pc_nmethod_stats.pc_desc_approx);
377
378 // Note: one might think that caching the most recently
379 // read value separately would be a win, but one would be
380 // wrong. When many threads are updating it, the cache
381 // line it's in would bounce between caches, negating
382 // any benefit.
383
384 // In order to prevent race conditions do not load cache elements
385 // repeatedly, but use a local copy:
386 PcDesc* res;
387
388 // Step one: Check the most recently added value.
389 res = _pc_descs[0];
390 if (res == NULL) return NULL; // native method; no PcDescs at all
391 if (match_desc(res, pc_offset, approximate)) {
392 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_repeats);
393 return res;
394 }
395
396 // Step two: Check the rest of the LRU cache.
397 for (int i = 1; i < cache_size; ++i) {
398 res = _pc_descs[i];
399 if (res->pc_offset() < 0) break; // optimization: skip empty cache
400 if (match_desc(res, pc_offset, approximate)) {
401 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_hits);
402 return res;
403 }
404 }
405
406 // Report failure.
407 return NULL;
408 }
409
410 void PcDescCache::add_pc_desc(PcDesc* pc_desc) {
411 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_adds);
412 // Update the LRU cache by shifting pc_desc forward.
413 for (int i = 0; i < cache_size; i++) {
414 PcDesc* next = _pc_descs[i];
415 _pc_descs[i] = pc_desc;
416 pc_desc = next;
417 }
418 }
419
420 // adjust pcs_size so that it is a multiple of both oopSize and
421 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple
422 // of oopSize, then 2*sizeof(PcDesc) is)
423 static int adjust_pcs_size(int pcs_size) {
424 int nsize = round_to(pcs_size, oopSize);
425 if ((nsize % sizeof(PcDesc)) != 0) {
426 nsize = pcs_size + sizeof(PcDesc);
427 }
428 assert((nsize % oopSize) == 0, "correct alignment");
429 return nsize;
430 }
431
537 _stack_traversal_mark = 0;
538 _unload_reported = false; // jvmti state
539
540 #ifdef ASSERT
541 _oops_are_stale = false;
542 #endif
543
544 _oops_do_mark_link = NULL;
545 _jmethod_id = NULL;
546 _osr_link = NULL;
547 if (UseG1GC) {
548 _unloading_next = NULL;
549 } else {
550 _scavenge_root_link = NULL;
551 }
552 _scavenge_root_state = 0;
553 _compiler = NULL;
554 #if INCLUDE_RTM_OPT
555 _rtm_state = NoRTM;
556 #endif
557 #if INCLUDE_JVMCI
558 _jvmci_installed_code = NULL;
559 _speculation_log = NULL;
560 #endif
561 }
562
563 nmethod* nmethod::new_native_nmethod(methodHandle method,
564 int compile_id,
565 CodeBuffer *code_buffer,
566 int vep_offset,
567 int frame_complete,
568 int frame_size,
569 ByteSize basic_lock_owner_sp_offset,
570 ByteSize basic_lock_sp_offset,
571 OopMapSet* oop_maps) {
572 code_buffer->finalize_oop_references(method);
573 // create nmethod
574 nmethod* nm = NULL;
575 {
576 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
577 int native_nmethod_size = allocation_size(code_buffer, sizeof(nmethod));
578 CodeOffsets offsets;
579 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
580 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
581 nm = new (native_nmethod_size, CompLevel_none) nmethod(method(), native_nmethod_size,
582 compile_id, &offsets,
583 code_buffer, frame_size,
584 basic_lock_owner_sp_offset,
585 basic_lock_sp_offset, oop_maps);
586 NOT_PRODUCT(if (nm != NULL) native_nmethod_stats.note_native_nmethod(nm));
587 if ((PrintAssembly || CompilerOracle::should_print(method)) && nm != NULL) {
588 Disassembler::decode(nm);
589 }
590 }
591 // verify nmethod
592 debug_only(if (nm) nm->verify();) // might block
593
594 if (nm != NULL) {
595 nm->log_new_nmethod();
596 }
597
598 return nm;
599 }
600
601 nmethod* nmethod::new_nmethod(methodHandle method,
602 int compile_id,
603 int entry_bci,
604 CodeOffsets* offsets,
605 int orig_pc_offset,
606 DebugInformationRecorder* debug_info,
607 Dependencies* dependencies,
608 CodeBuffer* code_buffer, int frame_size,
609 OopMapSet* oop_maps,
610 ExceptionHandlerTable* handler_table,
611 ImplicitExceptionTable* nul_chk_table,
612 AbstractCompiler* compiler,
613 int comp_level
614 #if INCLUDE_JVMCI
615 , Handle installed_code,
616 Handle speculationLog
617 #endif
618 )
619 {
620 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
621 code_buffer->finalize_oop_references(method);
622 // create nmethod
623 nmethod* nm = NULL;
624 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
625 int nmethod_size =
626 allocation_size(code_buffer, sizeof(nmethod))
627 + adjust_pcs_size(debug_info->pcs_size())
628 + round_to(dependencies->size_in_bytes() , oopSize)
629 + round_to(handler_table->size_in_bytes(), oopSize)
630 + round_to(nul_chk_table->size_in_bytes(), oopSize)
631 + round_to(debug_info->data_size() , oopSize);
632
633 nm = new (nmethod_size, comp_level)
634 nmethod(method(), nmethod_size, compile_id, entry_bci, offsets,
635 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size,
636 oop_maps,
637 handler_table,
638 nul_chk_table,
639 compiler,
640 comp_level
641 #if INCLUDE_JVMCI
642 , installed_code,
643 speculationLog
644 #endif
645 );
646
647 if (nm != NULL) {
648 // To make dependency checking during class loading fast, record
649 // the nmethod dependencies in the classes it is dependent on.
650 // This allows the dependency checking code to simply walk the
651 // class hierarchy above the loaded class, checking only nmethods
652 // which are dependent on those classes. The slow way is to
653 // check every nmethod for dependencies which makes it linear in
654 // the number of methods compiled. For applications with a lot
655 // classes the slow way is too slow.
656 for (Dependencies::DepStream deps(nm); deps.next(); ) {
657 if (deps.type() == Dependencies::call_site_target_value) {
658 // CallSite dependencies are managed on per-CallSite instance basis.
659 oop call_site = deps.argument_oop(0);
660 MethodHandles::add_dependent_nmethod(call_site, nm);
661 } else {
662 Klass* klass = deps.context_type();
663 if (klass == NULL) {
664 continue; // ignore things like evol_method
665 }
666 // record this nmethod as dependent on this klass
667 InstanceKlass::cast(klass)->add_dependent_nmethod(nm);
668 }
669 }
670 NOT_PRODUCT(if (nm != NULL) note_java_nmethod(nm));
671 if (PrintAssembly || CompilerOracle::has_option_string(method, "PrintAssembly")) {
672 Disassembler::decode(nm);
673 }
674 }
675 }
676 // Do verification and logging outside CodeCache_lock.
677 if (nm != NULL) {
678 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
679 DEBUG_ONLY(nm->verify();)
680 nm->log_new_nmethod();
681 }
682 return nm;
683 }
684
685 #ifdef _MSC_VER
686 #pragma warning(push)
687 #pragma warning(disable:4355) // warning C4355: 'this' : used in base member initializer list
688 #endif
689 // For native wrappers
690 nmethod::nmethod(
691 Method* method,
692 int nmethod_size,
693 int compile_id,
694 CodeOffsets* offsets,
695 CodeBuffer* code_buffer,
696 int frame_size,
697 ByteSize basic_lock_owner_sp_offset,
698 ByteSize basic_lock_sp_offset,
699 OopMapSet* oop_maps )
700 : CodeBlob("native nmethod", code_buffer, sizeof(nmethod),
701 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps),
702 _native_receiver_sp_offset(basic_lock_owner_sp_offset),
703 _native_basic_lock_sp_offset(basic_lock_sp_offset)
704 {
705 {
706 debug_only(No_Safepoint_Verifier nsv;)
707 assert_locked_or_safepoint(CodeCache_lock);
708
758 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
759 }
760 // print the header part first
761 print();
762 // then print the requested information
763 if (PrintNativeNMethods) {
764 print_code();
765 if (oop_maps != NULL) {
766 oop_maps->print();
767 }
768 }
769 if (PrintRelocations) {
770 print_relocations();
771 }
772 if (xtty != NULL) {
773 xtty->tail("print_native_nmethod");
774 }
775 }
776 }
777
778 #ifdef _MSC_VER
779 #pragma warning(pop)
780 #endif
781
782 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () {
783 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level));
784 }
785
786 nmethod::nmethod(
787 Method* method,
788 int nmethod_size,
789 int compile_id,
790 int entry_bci,
791 CodeOffsets* offsets,
792 int orig_pc_offset,
793 DebugInformationRecorder* debug_info,
794 Dependencies* dependencies,
795 CodeBuffer *code_buffer,
796 int frame_size,
797 OopMapSet* oop_maps,
798 ExceptionHandlerTable* handler_table,
799 ImplicitExceptionTable* nul_chk_table,
800 AbstractCompiler* compiler,
801 int comp_level
802 #if INCLUDE_JVMCI
803 , Handle installed_code,
804 Handle speculation_log
805 #endif
806 )
807 : CodeBlob("nmethod", code_buffer, sizeof(nmethod),
808 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps),
809 _native_receiver_sp_offset(in_ByteSize(-1)),
810 _native_basic_lock_sp_offset(in_ByteSize(-1))
811 {
812 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
813 {
814 debug_only(No_Safepoint_Verifier nsv;)
815 assert_locked_or_safepoint(CodeCache_lock);
816
817 init_defaults();
818 _method = method;
819 _entry_bci = entry_bci;
820 _compile_id = compile_id;
821 _comp_level = comp_level;
822 _compiler = compiler;
823 _orig_pc_offset = orig_pc_offset;
824 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
825
826 // Section offsets
827 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts());
828 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs());
829
830 #if INCLUDE_JVMCI
831 _jvmci_installed_code = installed_code();
832 _speculation_log = (instanceOop)speculation_log();
833
834 if (compiler->is_jvmci()) {
835 // JVMCI might not produce any stub sections
836 if (offsets->value(CodeOffsets::Exceptions) != -1) {
837 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions);
838 } else {
839 _exception_offset = -1;
840 }
841 if (offsets->value(CodeOffsets::Deopt) != -1) {
842 _deoptimize_offset = code_offset() + offsets->value(CodeOffsets::Deopt);
843 } else {
844 _deoptimize_offset = -1;
845 }
846 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
847 _deoptimize_mh_offset = code_offset() + offsets->value(CodeOffsets::DeoptMH);
848 } else {
849 _deoptimize_mh_offset = -1;
850 }
851 } else {
852 #endif
853 // Exception handler and deopt handler are in the stub section
854 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set");
855 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set");
856
857 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
858 _deoptimize_offset = _stub_offset + offsets->value(CodeOffsets::Deopt);
859 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
860 _deoptimize_mh_offset = _stub_offset + offsets->value(CodeOffsets::DeoptMH);
861 } else {
862 _deoptimize_mh_offset = -1;
863 #if INCLUDE_JVMCI
864 }
865 #endif
866 }
867 if (offsets->value(CodeOffsets::UnwindHandler) != -1) {
868 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler);
869 } else {
870 _unwind_handler_offset = -1;
871 }
872
873 _oops_offset = data_offset();
874 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize);
875 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize);
876
877 _scopes_pcs_offset = _scopes_data_offset + round_to(debug_info->data_size (), oopSize);
878 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
879 _handler_table_offset = _dependencies_offset + round_to(dependencies->size_in_bytes (), oopSize);
880 _nul_chk_table_offset = _handler_table_offset + round_to(handler_table->size_in_bytes(), oopSize);
881 _nmethod_end_offset = _nul_chk_table_offset + round_to(nul_chk_table->size_in_bytes(), oopSize);
882
883 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
884 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
885 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry);
889 // Copy contents of ScopeDescRecorder to nmethod
890 code_buffer->copy_values_to(this);
891 debug_info->copy_to(this);
892 dependencies->copy_to(this);
893 if (ScavengeRootsInCode) {
894 if (detect_scavenge_root_oops()) {
895 CodeCache::add_scavenge_root_nmethod(this);
896 }
897 Universe::heap()->register_nmethod(this);
898 }
899 debug_only(verify_scavenge_root_oops());
900
901 CodeCache::commit(this);
902
903 // Copy contents of ExceptionHandlerTable to nmethod
904 handler_table->copy_to(this);
905 nul_chk_table->copy_to(this);
906
907 // we use the information of entry points to find out if a method is
908 // static or non static
909 assert(compiler->is_c2() || compiler->is_jvmci() ||
910 _method->is_static() == (entry_point() == _verified_entry_point),
911 " entry points must be same for static methods and vice versa");
912 }
913
914 bool printnmethods = PrintNMethods || PrintNMethodsAtLevel == _comp_level
915 || CompilerOracle::should_print(_method)
916 || CompilerOracle::has_option_string(_method, "PrintNMethods");
917 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
918 print_nmethod(printnmethods);
919 }
920 }
921
922 // Print a short set of xml attributes to identify this nmethod. The
923 // output should be embedded in some other element.
924 void nmethod::log_identity(xmlStream* log) const {
925 log->print(" compile_id='%d'", compile_id());
926 const char* nm_kind = compile_kind();
927 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind);
928 if (compiler() != NULL) {
929 log->print(" compiler='%s'", compiler()->name());
930 }
931 if (TieredCompilation) {
932 log->print(" level='%d'", comp_level());
933 }
934 }
935
936
937 #define LOG_OFFSET(log, name) \
938 if ((intptr_t)name##_end() - (intptr_t)name##_begin()) \
939 log->print(" " XSTR(name) "_offset='%d'" , \
940 (intptr_t)name##_begin() - (intptr_t)this)
941
942
943 void nmethod::log_new_nmethod() const {
944 if (LogCompilation && xtty != NULL) {
945 ttyLocker ttyl;
946 HandleMark hm;
947 xtty->begin_elem("nmethod");
948 log_identity(xtty);
949 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", code_begin(), size());
950 xtty->print(" address='" INTPTR_FORMAT "'", (intptr_t) this);
951
952 LOG_OFFSET(xtty, relocation);
953 LOG_OFFSET(xtty, consts);
954 LOG_OFFSET(xtty, insts);
955 LOG_OFFSET(xtty, stub);
956 LOG_OFFSET(xtty, scopes_data);
957 LOG_OFFSET(xtty, scopes_pcs);
958 LOG_OFFSET(xtty, dependencies);
959 LOG_OFFSET(xtty, handler_table);
960 LOG_OFFSET(xtty, nul_chk_table);
961 LOG_OFFSET(xtty, oops);
962 LOG_OFFSET(xtty, metadata);
963
964 xtty->method(method());
965 xtty->stamp();
966 xtty->end_elem();
967 }
968 }
969
970 #undef LOG_OFFSET
971
972
973 // Print out more verbose output usually for a newly created nmethod.
974 void nmethod::print_on(outputStream* st, const char* msg) const {
975 if (st != NULL) {
976 ttyLocker ttyl;
977 if (WizardMode) {
978 CompileTask::print_compilation(st, this, msg, /*short_form:*/ true);
979 st->print_cr(" (" INTPTR_FORMAT ")", this);
980 } else {
981 CompileTask::print_compilation(st, this, msg, /*short_form:*/ false);
982 }
984 }
985
986
987 void nmethod::print_nmethod(bool printmethod) {
988 ttyLocker ttyl; // keep the following output all in one block
989 if (xtty != NULL) {
990 xtty->begin_head("print_nmethod");
991 xtty->stamp();
992 xtty->end_head();
993 }
994 // print the header part first
995 print();
996 // then print the requested information
997 if (printmethod) {
998 print_code();
999 print_pcs();
1000 if (oop_maps()) {
1001 oop_maps()->print();
1002 }
1003 }
1004 if (PrintDebugInfo || CompilerOracle::has_option_string(_method, "PrintDebugInfo")) {
1005 print_scopes();
1006 }
1007 if (PrintRelocations || CompilerOracle::has_option_string(_method, "PrintRelocations")) {
1008 print_relocations();
1009 }
1010 if (PrintDependencies || CompilerOracle::has_option_string(_method, "PrintDependencies")) {
1011 print_dependencies();
1012 }
1013 if (PrintExceptionHandlers) {
1014 print_handler_table();
1015 print_nul_chk_table();
1016 }
1017 if (xtty != NULL) {
1018 xtty->tail("print_nmethod");
1019 }
1020 }
1021
1022
1023 // Promote one word from an assembly-time handle to a live embedded oop.
1024 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
1025 if (handle == NULL ||
1026 // As a special case, IC oops are initialized to 1 or -1.
1027 handle == (jobject) Universe::non_oop_word()) {
1028 (*dest) = (oop) handle;
1029 } else {
1030 (*dest) = JNIHandles::resolve_non_null(handle);
1100
1101
1102 void nmethod::verify_oop_relocations() {
1103 // Ensure sure that the code matches the current oop values
1104 RelocIterator iter(this, NULL, NULL);
1105 while (iter.next()) {
1106 if (iter.type() == relocInfo::oop_type) {
1107 oop_Relocation* reloc = iter.oop_reloc();
1108 if (!reloc->oop_is_immediate()) {
1109 reloc->verify_oop_relocation();
1110 }
1111 }
1112 }
1113 }
1114
1115
1116 ScopeDesc* nmethod::scope_desc_at(address pc) {
1117 PcDesc* pd = pc_desc_at(pc);
1118 guarantee(pd != NULL, "scope must be present");
1119 return new ScopeDesc(this, pd->scope_decode_offset(),
1120 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(),
1121 pd->return_oop());
1122 }
1123
1124
1125 void nmethod::clear_inline_caches() {
1126 assert(SafepointSynchronize::is_at_safepoint(), "cleaning of IC's only allowed at safepoint");
1127 if (is_zombie()) {
1128 return;
1129 }
1130
1131 RelocIterator iter(this);
1132 while (iter.next()) {
1133 iter.reloc()->clear_inline_cache();
1134 }
1135 }
1136
1137 // Clear ICStubs of all compiled ICs
1138 void nmethod::clear_ic_stubs() {
1139 assert_locked_or_safepoint(CompiledIC_lock);
1140 RelocIterator iter(this);
1271 assert(is_alive(), "Must be an alive method");
1272 // Set the traversal mark to ensure that the sweeper does 2
1273 // cleaning passes before moving to zombie.
1274 set_stack_traversal_mark(NMethodSweeper::traversal_count());
1275 }
1276
1277 // Tell if a non-entrant method can be converted to a zombie (i.e.,
1278 // there are no activations on the stack, not in use by the VM,
1279 // and not in use by the ServiceThread)
1280 bool nmethod::can_not_entrant_be_converted() {
1281 assert(is_not_entrant(), "must be a non-entrant method");
1282
1283 // Since the nmethod sweeper only does partial sweep the sweeper's traversal
1284 // count can be greater than the stack traversal count before it hits the
1285 // nmethod for the second time.
1286 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count() &&
1287 !is_locked_by_vm();
1288 }
1289
1290 void nmethod::inc_decompile_count() {
1291 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return;
1292 // Could be gated by ProfileTraps, but do not bother...
1293 Method* m = method();
1294 if (m == NULL) return;
1295 MethodData* mdo = m->method_data();
1296 if (mdo == NULL) return;
1297 // There is a benign race here. See comments in methodData.hpp.
1298 mdo->inc_decompile_count();
1299 }
1300
1301 void nmethod::increase_unloading_clock() {
1302 _global_unloading_clock++;
1303 if (_global_unloading_clock == 0) {
1304 // _nmethods are allocated with _unloading_clock == 0,
1305 // so 0 is never used as a clock value.
1306 _global_unloading_clock = 1;
1307 }
1308 }
1309
1310 void nmethod::set_unloading_clock(unsigned char unloading_clock) {
1311 OrderAccess::release_store((volatile jubyte*)&_unloading_clock, unloading_clock);
1335 this, (address)_method, (address)cause);
1336 if (!Universe::heap()->is_gc_active())
1337 cause->klass()->print();
1338 }
1339 // Unlink the osr method, so we do not look this up again
1340 if (is_osr_method()) {
1341 invalidate_osr_method();
1342 }
1343 // If _method is already NULL the Method* is about to be unloaded,
1344 // so we don't have to break the cycle. Note that it is possible to
1345 // have the Method* live here, in case we unload the nmethod because
1346 // it is pointing to some oop (other than the Method*) being unloaded.
1347 if (_method != NULL) {
1348 // OSR methods point to the Method*, but the Method* does not
1349 // point back!
1350 if (_method->code() == this) {
1351 _method->clear_code(); // Break a cycle
1352 }
1353 _method = NULL; // Clear the method of this dead nmethod
1354 }
1355
1356 // Make the class unloaded - i.e., change state and notify sweeper
1357 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
1358 if (is_in_use()) {
1359 // Transitioning directly from live to unloaded -- so
1360 // we need to force a cache clean-up; remember this
1361 // for later on.
1362 CodeCache::set_needs_cache_clean(true);
1363 }
1364
1365 // Unregister must be done before the state change
1366 Universe::heap()->unregister_nmethod(this);
1367
1368 #if INCLUDE_JVMCI
1369 // The method can only be unloaded after the pointer to the installed code
1370 // Java wrapper is no longer alive. Here we need to clear out this weak
1371 // reference to the dead object. Nulling out the reference has to happen
1372 // after the method is unregistered since the original value may be still
1373 // tracked by the rset.
1374 if (_jvmci_installed_code != NULL) {
1375 InstalledCode::set_address(_jvmci_installed_code, 0);
1376 _jvmci_installed_code = NULL;
1377 }
1378 #endif
1379
1380 _state = unloaded;
1381
1382 // Log the unloading.
1383 log_state_change();
1384
1385 // The Method* is gone at this point
1386 assert(_method == NULL, "Tautology");
1387
1388 set_osr_link(NULL);
1389 //set_scavenge_root_link(NULL); // done by prune_scavenge_root_nmethods
1390 NMethodSweeper::report_state_change(this);
1391 }
1392
1393 void nmethod::invalidate_osr_method() {
1394 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
1395 // Remove from list of active nmethods
1396 if (method() != NULL)
1397 method()->method_holder()->remove_osr_nmethod(this);
1398 }
1399
1523 }
1524
1525 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload
1526 // event and it hasn't already been reported for this nmethod then
1527 // report it now. The event may have been reported earilier if the GC
1528 // marked it for unloading). JvmtiDeferredEventQueue support means
1529 // we no longer go to a safepoint here.
1530 post_compiled_method_unload();
1531
1532 #ifdef ASSERT
1533 // It's no longer safe to access the oops section since zombie
1534 // nmethods aren't scanned for GC.
1535 _oops_are_stale = true;
1536 #endif
1537 // the Method may be reclaimed by class unloading now that the
1538 // nmethod is in zombie state
1539 set_method(NULL);
1540 } else {
1541 assert(state == not_entrant, "other cases may need to be handled differently");
1542 }
1543 #if INCLUDE_JVMCI
1544 if (_jvmci_installed_code != NULL) {
1545 // Break the link between nmethod and InstalledCode such that the nmethod can subsequently be flushed safely.
1546 InstalledCode::set_address(_jvmci_installed_code, 0);
1547 }
1548 #endif
1549
1550 if (TraceCreateZombies) {
1551 ResourceMark m;
1552 tty->print_cr("nmethod <" INTPTR_FORMAT "> %s code made %s", this, this->method() ? this->method()->name_and_sig_as_C_string() : "null", (state == not_entrant) ? "not entrant" : "zombie");
1553 }
1554
1555 NMethodSweeper::report_state_change(this);
1556 return true;
1557 }
1558
1559 void nmethod::flush() {
1560 // Note that there are no valid oops in the nmethod anymore.
1561 assert(is_zombie() || (is_osr_method() && is_unloaded()), "must be a zombie method");
1562 assert(is_marked_for_reclamation() || (is_osr_method() && is_unloaded()), "must be marked for reclamation");
1563
1564 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed");
1565 assert_locked_or_safepoint(CodeCache_lock);
1566
1567 // completely deallocate this method
1568 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, this);
1569 if (PrintMethodFlushing) {
1570 tty->print_cr("*flushing nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT "/Free CodeCache:" SIZE_FORMAT "Kb",
1571 _compile_id, this, CodeCache::nof_blobs(), CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024);
1572 }
1820 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1821 "oop must be found in exactly one place");
1822 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1823 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) {
1824 return;
1825 }
1826 }
1827 }
1828 }
1829 }
1830
1831
1832 // Scopes
1833 for (oop* p = oops_begin(); p < oops_end(); p++) {
1834 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1835 if (can_unload(is_alive, p, unloading_occurred)) {
1836 return;
1837 }
1838 }
1839
1840 #if INCLUDE_JVMCI
1841 // Follow JVMCI method
1842 BarrierSet* bs = Universe::heap()->barrier_set();
1843 if (_jvmci_installed_code != NULL) {
1844 if (_jvmci_installed_code->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(_jvmci_installed_code)) {
1845 if (!is_alive->do_object_b(_jvmci_installed_code)) {
1846 bs->write_ref_nmethod_pre(&_jvmci_installed_code, this);
1847 _jvmci_installed_code = NULL;
1848 bs->write_ref_nmethod_post(&_jvmci_installed_code, this);
1849 }
1850 } else {
1851 if (can_unload(is_alive, (oop*)&_jvmci_installed_code, unloading_occurred)) {
1852 return;
1853 }
1854 }
1855 }
1856
1857 if (_speculation_log != NULL) {
1858 if (!is_alive->do_object_b(_speculation_log)) {
1859 bs->write_ref_nmethod_pre(&_speculation_log, this);
1860 _speculation_log = NULL;
1861 bs->write_ref_nmethod_post(&_speculation_log, this);
1862 }
1863 }
1864 #endif
1865
1866
1867 // Ensure that all metadata is still alive
1868 verify_metadata_loaders(low_boundary, is_alive);
1869 }
1870
1871 template <class CompiledICorStaticCall>
1872 static bool clean_if_nmethod_is_unloaded(CompiledICorStaticCall *ic, address addr, BoolObjectClosure *is_alive, nmethod* from) {
1873 // Ok, to lookup references to zombies here
1874 CodeBlob *cb = CodeCache::find_blob_unsafe(addr);
1875 if (cb != NULL && cb->is_nmethod()) {
1876 nmethod* nm = (nmethod*)cb;
1877
1878 if (nm->unloading_clock() != nmethod::global_unloading_clock()) {
1879 // The nmethod has not been processed yet.
1880 return true;
1881 }
1882
1883 // Clean inline caches pointing to both zombie and not_entrant methods
1884 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1885 ic->set_to_clean();
1886 assert(ic->is_clean(), err_msg("nmethod " PTR_FORMAT "not clean %s", from, from->method()->name_and_sig_as_C_string()));
1929 // first few bytes. If an oop in the old code was there, that oop
1930 // should not get GC'd. Skip the first few bytes of oops on
1931 // not-entrant methods.
1932 address low_boundary = verified_entry_point();
1933 if (is_not_entrant()) {
1934 low_boundary += NativeJump::instruction_size;
1935 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1936 // (See comment above.)
1937 }
1938
1939 // The RedefineClasses() API can cause the class unloading invariant
1940 // to no longer be true. See jvmtiExport.hpp for details.
1941 // Also, leave a debugging breadcrumb in local flag.
1942 if (JvmtiExport::has_redefined_a_class()) {
1943 // This set of the unloading_occurred flag is done before the
1944 // call to post_compiled_method_unload() so that the unloading
1945 // of this nmethod is reported.
1946 unloading_occurred = true;
1947 }
1948
1949 #if INCLUDE_JVMCI
1950 // Follow JVMCI method
1951 if (_jvmci_installed_code != NULL) {
1952 if (_jvmci_installed_code->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(_jvmci_installed_code)) {
1953 if (!is_alive->do_object_b(_jvmci_installed_code)) {
1954 _jvmci_installed_code = NULL;
1955 }
1956 } else {
1957 if (can_unload(is_alive, (oop*)&_jvmci_installed_code, unloading_occurred)) {
1958 return false;
1959 }
1960 }
1961 }
1962
1963 if (_speculation_log != NULL) {
1964 if (!is_alive->do_object_b(_speculation_log)) {
1965 _speculation_log = NULL;
1966 }
1967 }
1968 #endif
1969
1970 // Exception cache
1971 clean_exception_cache(is_alive);
1972
1973 bool is_unloaded = false;
1974 bool postponed = false;
1975
1976 RelocIterator iter(this, low_boundary);
1977 while(iter.next()) {
1978
1979 switch (iter.type()) {
1980
1981 case relocInfo::virtual_call_type:
1982 if (unloading_occurred) {
1983 // If class unloading occurred we first iterate over all inline caches and
1984 // clear ICs where the cached oop is referring to an unloaded klass or method.
1985 clean_ic_if_metadata_is_dead(CompiledIC_at(&iter), is_alive);
1986 }
1987
1988 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
1989 break;
2007 }
2008 }
2009
2010 if (is_unloaded) {
2011 return postponed;
2012 }
2013
2014 // Scopes
2015 for (oop* p = oops_begin(); p < oops_end(); p++) {
2016 if (*p == Universe::non_oop_word()) continue; // skip non-oops
2017 if (can_unload(is_alive, p, unloading_occurred)) {
2018 is_unloaded = true;
2019 break;
2020 }
2021 }
2022
2023 if (is_unloaded) {
2024 return postponed;
2025 }
2026
2027 #if INCLUDE_JVMCI
2028 // Follow JVMCI method
2029 BarrierSet* bs = Universe::heap()->barrier_set();
2030 if (_jvmci_installed_code != NULL) {
2031 if (_jvmci_installed_code->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(_jvmci_installed_code)) {
2032 if (!is_alive->do_object_b(_jvmci_installed_code)) {
2033 bs->write_ref_nmethod_pre(&_jvmci_installed_code, this);
2034 _jvmci_installed_code = NULL;
2035 bs->write_ref_nmethod_post(&_jvmci_installed_code, this);
2036 }
2037 } else {
2038 if (can_unload(is_alive, (oop*)&_jvmci_installed_code, unloading_occurred)) {
2039 is_unloaded = true;
2040 }
2041 }
2042 }
2043
2044 if (_speculation_log != NULL) {
2045 if (!is_alive->do_object_b(_speculation_log)) {
2046 bs->write_ref_nmethod_pre(&_speculation_log, this);
2047 _speculation_log = NULL;
2048 bs->write_ref_nmethod_post(&_speculation_log, this);
2049 }
2050 }
2051 #endif
2052
2053 // Ensure that all metadata is still alive
2054 verify_metadata_loaders(low_boundary, is_alive);
2055
2056 return postponed;
2057 }
2058
2059 void nmethod::do_unloading_parallel_postponed(BoolObjectClosure* is_alive, bool unloading_occurred) {
2060 ResourceMark rm;
2061
2062 // Make sure the oop's ready to receive visitors
2063 assert(!is_zombie(),
2064 "should not call follow on zombie nmethod");
2065
2066 // If the method is not entrant then a JMP is plastered over the
2067 // first few bytes. If an oop in the old code was there, that oop
2068 // should not get GC'd. Skip the first few bytes of oops on
2069 // not-entrant methods.
2070 address low_boundary = verified_entry_point();
2071 if (is_not_entrant()) {
2072 low_boundary += NativeJump::instruction_size;
2217 // Visit metadata not embedded in the other places.
2218 if (_method != NULL) f(_method);
2219 }
2220
2221 void nmethod::oops_do(OopClosure* f, bool allow_zombie) {
2222 // make sure the oops ready to receive visitors
2223 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod");
2224 assert(!is_unloaded(), "should not call follow on unloaded nmethod");
2225
2226 // If the method is not entrant or zombie then a JMP is plastered over the
2227 // first few bytes. If an oop in the old code was there, that oop
2228 // should not get GC'd. Skip the first few bytes of oops on
2229 // not-entrant methods.
2230 address low_boundary = verified_entry_point();
2231 if (is_not_entrant()) {
2232 low_boundary += NativeJump::instruction_size;
2233 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
2234 // (See comment above.)
2235 }
2236
2237 #if INCLUDE_JVMCI
2238 if (_jvmci_installed_code != NULL) {
2239 f->do_oop((oop*) &_jvmci_installed_code);
2240 }
2241 if (_speculation_log != NULL) {
2242 f->do_oop((oop*) &_speculation_log);
2243 }
2244 #endif
2245
2246 RelocIterator iter(this, low_boundary);
2247
2248 while (iter.next()) {
2249 if (iter.type() == relocInfo::oop_type ) {
2250 oop_Relocation* r = iter.oop_reloc();
2251 // In this loop, we must only follow those oops directly embedded in
2252 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
2253 assert(1 == (r->oop_is_immediate()) +
2254 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
2255 "oop must be found in exactly one place");
2256 if (r->oop_is_immediate() && r->oop_value() != NULL) {
2257 f->do_oop(r->oop_addr());
2258 }
2259 }
2260 }
2261
2262 // Scopes
2263 // This includes oop constants not inlined in the code stream.
2264 for (oop* p = oops_begin(); p < oops_end(); p++) {
2265 if (*p == Universe::non_oop_word()) continue; // skip non-oops
2350 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root");
2351 tty->print_cr("" PTR_FORMAT "[offset=%d] detected scavengable oop " PTR_FORMAT " (found at " PTR_FORMAT ")",
2352 _print_nm, (int)((intptr_t)p - (intptr_t)_print_nm),
2353 (void *)(*p), (intptr_t)p);
2354 (*p)->print();
2355 }
2356 #endif //PRODUCT
2357 };
2358
2359 bool nmethod::detect_scavenge_root_oops() {
2360 DetectScavengeRoot detect_scavenge_root;
2361 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this);
2362 oops_do(&detect_scavenge_root);
2363 return detect_scavenge_root.detected_scavenge_root();
2364 }
2365
2366 // Method that knows how to preserve outgoing arguments at call. This method must be
2367 // called with a frame corresponding to a Java invoke
2368 void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) {
2369 #ifndef SHARK
2370 if (method() != NULL && !method()->is_native()) {
2371 SimpleScopeDesc ssd(this, fr.pc());
2372 Bytecode_invoke call(ssd.method(), ssd.bci());
2373 bool has_receiver = call.has_receiver();
2374 bool has_appendix = call.has_appendix();
2375 Symbol* signature = call.signature();
2376 fr.oops_compiled_arguments_do(signature, has_receiver, has_appendix, reg_map, f);
2377 }
2378 #endif // !SHARK
2379 }
2380
2381 inline bool includes(void* p, void* from, void* to) {
2382 return from <= p && p < to;
2383 }
2384
2385
2386 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
2387 assert(count >= 2, "must be sentinel values, at least");
2388
2389 #ifdef ASSERT
2390 // must be sorted and unique; we do a binary search in find_pc_desc()
2416 // Adjust the final sentinel downward.
2417 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
2418 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
2419 last_pc->set_pc_offset(content_size() + 1);
2420 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
2421 // Fill any rounding gaps with copies of the last record.
2422 last_pc[1] = last_pc[0];
2423 }
2424 // The following assert could fail if sizeof(PcDesc) is not
2425 // an integral multiple of oopSize (the rounding term).
2426 // If it fails, change the logic to always allocate a multiple
2427 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
2428 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
2429 }
2430
2431 void nmethod::copy_scopes_data(u_char* buffer, int size) {
2432 assert(scopes_data_size() >= size, "oob");
2433 memcpy(scopes_data_begin(), buffer, size);
2434 }
2435
2436 // When using JVMCI the address might be off by the size of a call instruction.
2437 bool nmethod::is_deopt_entry(address pc) {
2438 return pc == deopt_handler_begin()
2439 #if INCLUDE_JVMCI
2440 || pc == (deopt_handler_begin() + NativeCall::instruction_size)
2441 #endif
2442 ;
2443 }
2444
2445 #ifdef ASSERT
2446 static PcDesc* linear_search(nmethod* nm, int pc_offset, bool approximate) {
2447 PcDesc* lower = nm->scopes_pcs_begin();
2448 PcDesc* upper = nm->scopes_pcs_end();
2449 lower += 1; // exclude initial sentinel
2450 PcDesc* res = NULL;
2451 for (PcDesc* p = lower; p < upper; p++) {
2452 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc
2453 if (match_desc(p, pc_offset, approximate)) {
2454 if (res == NULL)
2455 res = p;
2456 else
2457 res = (PcDesc*) badAddress;
2458 }
2459 }
2460 return res;
2461 }
2462 #endif
2463
2464
2465 // Finds a PcDesc with real-pc equal to "pc"
2466 PcDesc* nmethod::find_pc_desc_internal(address pc, bool approximate) {
2467 address base_address = code_begin();
2468 if ((pc < base_address) ||
2469 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
2470 return NULL; // PC is wildly out of range
2471 }
2472 int pc_offset = (int) (pc - base_address);
2479 return res;
2480 }
2481
2482 // Fallback algorithm: quasi-linear search for the PcDesc
2483 // Find the last pc_offset less than the given offset.
2484 // The successor must be the required match, if there is a match at all.
2485 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
2486 PcDesc* lower = scopes_pcs_begin();
2487 PcDesc* upper = scopes_pcs_end();
2488 upper -= 1; // exclude final sentinel
2489 if (lower >= upper) return NULL; // native method; no PcDescs at all
2490
2491 #define assert_LU_OK \
2492 /* invariant on lower..upper during the following search: */ \
2493 assert(lower->pc_offset() < pc_offset, "sanity"); \
2494 assert(upper->pc_offset() >= pc_offset, "sanity")
2495 assert_LU_OK;
2496
2497 // Use the last successful return as a split point.
2498 PcDesc* mid = _pc_desc_cache.last_pc_desc();
2499 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
2500 if (mid->pc_offset() < pc_offset) {
2501 lower = mid;
2502 } else {
2503 upper = mid;
2504 }
2505
2506 // Take giant steps at first (4096, then 256, then 16, then 1)
2507 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
2508 const int RADIX = (1 << LOG2_RADIX);
2509 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
2510 while ((mid = lower + step) < upper) {
2511 assert_LU_OK;
2512 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
2513 if (mid->pc_offset() < pc_offset) {
2514 lower = mid;
2515 } else {
2516 upper = mid;
2517 break;
2518 }
2519 }
2520 assert_LU_OK;
2521 }
2522
2523 // Sneak up on the value with a linear search of length ~16.
2524 while (true) {
2525 assert_LU_OK;
2526 mid = lower + 1;
2527 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
2528 if (mid->pc_offset() < pc_offset) {
2529 lower = mid;
2530 } else {
2531 upper = mid;
2532 break;
2533 }
2534 }
2535 #undef assert_LU_OK
2536
2537 if (match_desc(upper, pc_offset, approximate)) {
2538 assert(upper == linear_search(this, pc_offset, approximate), "search ok");
2539 _pc_desc_cache.add_pc_desc(upper);
2540 return upper;
2541 } else {
2542 assert(NULL == linear_search(this, pc_offset, approximate), "search ok");
2543 return NULL;
2544 }
2545 }
2546
2547
2694 CodeBlob* cb = CodeCache::find_blob(pc);
2695 guarantee(cb != NULL && cb->is_nmethod(), "bad pc for a nmethod found");
2696 _nm = (nmethod*)cb;
2697 lock_nmethod(_nm);
2698 }
2699
2700 // Only JvmtiDeferredEvent::compiled_method_unload_event()
2701 // should pass zombie_ok == true.
2702 void nmethodLocker::lock_nmethod(nmethod* nm, bool zombie_ok) {
2703 if (nm == NULL) return;
2704 Atomic::inc(&nm->_lock_count);
2705 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method");
2706 }
2707
2708 void nmethodLocker::unlock_nmethod(nmethod* nm) {
2709 if (nm == NULL) return;
2710 Atomic::dec(&nm->_lock_count);
2711 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock");
2712 }
2713
2714 // -----------------------------------------------------------------------------
2715 // nmethod::get_deopt_original_pc
2716 //
2717 // Return the original PC for the given PC if:
2718 // (a) the given PC belongs to a nmethod and
2719 // (b) it is a deopt PC
2720 address nmethod::get_deopt_original_pc(const frame* fr) {
2721 if (fr->cb() == NULL) return NULL;
2722
2723 nmethod* nm = fr->cb()->as_nmethod_or_null();
2724 if (nm != NULL && nm->is_deopt_pc(fr->pc()))
2725 return nm->get_original_pc(fr);
2726
2727 return NULL;
2728 }
2729
2730
2731 // -----------------------------------------------------------------------------
2732 // MethodHandle
2733
2807 void nmethod::verify_interrupt_point(address call_site) {
2808 // Verify IC only when nmethod installation is finished.
2809 bool is_installed = (method()->code() == this) // nmethod is in state 'in_use' and installed
2810 || !this->is_in_use(); // nmethod is installed, but not in 'in_use' state
2811 if (is_installed) {
2812 Thread *cur = Thread::current();
2813 if (CompiledIC_lock->owner() == cur ||
2814 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) &&
2815 SafepointSynchronize::is_at_safepoint())) {
2816 CompiledIC_at(this, call_site);
2817 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
2818 } else {
2819 MutexLocker ml_verify (CompiledIC_lock);
2820 CompiledIC_at(this, call_site);
2821 }
2822 }
2823
2824 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address());
2825 assert(pd != NULL, "PcDesc must exist");
2826 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(),
2827 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(),
2828 pd->return_oop());
2829 !sd->is_top(); sd = sd->sender()) {
2830 sd->verify();
2831 }
2832 }
2833
2834 void nmethod::verify_scopes() {
2835 if( !method() ) return; // Runtime stubs have no scope
2836 if (method()->is_native()) return; // Ignore stub methods.
2837 // iterate through all interrupt point
2838 // and verify the debug information is valid.
2839 RelocIterator iter((nmethod*)this);
2840 while (iter.next()) {
2841 address stub = NULL;
2842 switch (iter.type()) {
2843 case relocInfo::virtual_call_type:
2844 verify_interrupt_point(iter.addr());
2845 break;
2846 case relocInfo::opt_virtual_call_type:
2847 stub = iter.opt_virtual_call_reloc()->static_stub();
2900 }
2901 assert(scavenge_root_not_marked(), "");
2902 }
2903
2904 #endif // PRODUCT
2905
2906 // Printing operations
2907
2908 void nmethod::print() const {
2909 ResourceMark rm;
2910 ttyLocker ttyl; // keep the following output all in one block
2911
2912 tty->print("Compiled method ");
2913
2914 if (is_compiled_by_c1()) {
2915 tty->print("(c1) ");
2916 } else if (is_compiled_by_c2()) {
2917 tty->print("(c2) ");
2918 } else if (is_compiled_by_shark()) {
2919 tty->print("(shark) ");
2920 } else if (is_compiled_by_jvmci()) {
2921 tty->print("(JVMCI) ");
2922 } else {
2923 tty->print("(nm) ");
2924 }
2925
2926 print_on(tty, NULL);
2927
2928 if (WizardMode) {
2929 tty->print("((nmethod*) " INTPTR_FORMAT ") ", this);
2930 tty->print(" for method " INTPTR_FORMAT , (address)method());
2931 tty->print(" { ");
2932 if (is_in_use()) tty->print("in_use ");
2933 if (is_not_entrant()) tty->print("not_entrant ");
2934 if (is_zombie()) tty->print("zombie ");
2935 if (is_unloaded()) tty->print("unloaded ");
2936 if (on_scavenge_root_list()) tty->print("scavenge_root ");
2937 tty->print_cr("}:");
2938 }
2939 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2940 (address)this,
2941 (address)this + size(),
2986 nul_chk_table_size());
2987 }
2988
2989 void nmethod::print_code() {
2990 HandleMark hm;
2991 ResourceMark m;
2992 Disassembler::decode(this);
2993 }
2994
2995
2996 #ifndef PRODUCT
2997
2998 void nmethod::print_scopes() {
2999 // Find the first pc desc for all scopes in the code and print it.
3000 ResourceMark rm;
3001 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
3002 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
3003 continue;
3004
3005 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
3006 while (sd != NULL) {
3007 sd->print_on(tty, p);
3008 sd = sd->sender();
3009 }
3010 }
3011 }
3012
3013 void nmethod::print_dependencies() {
3014 ResourceMark rm;
3015 ttyLocker ttyl; // keep the following output all in one block
3016 tty->print_cr("Dependencies:");
3017 for (Dependencies::DepStream deps(this); deps.next(); ) {
3018 deps.print_dependency();
3019 Klass* ctxk = deps.context_type();
3020 if (ctxk != NULL) {
3021 if (ctxk->oop_is_instance() && ((InstanceKlass*)ctxk)->is_dependent_nmethod(this)) {
3022 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name());
3023 }
3024 }
3025 deps.log_dependency(); // put it into the xml log also
3026 }
3027 }
3028
3029
3106 case relocInfo::virtual_call_type: return "virtual_call";
3107 case relocInfo::opt_virtual_call_type: return "optimized virtual_call";
3108 case relocInfo::static_call_type: return "static_call";
3109 case relocInfo::static_stub_type: return "static_stub";
3110 case relocInfo::external_word_type: return "external_word";
3111 case relocInfo::internal_word_type: return "internal_word";
3112 case relocInfo::section_word_type: return "section_word";
3113 case relocInfo::poll_type: return "poll";
3114 case relocInfo::poll_return_type: return "poll_return";
3115 case relocInfo::type_mask: return "type_bit_mask";
3116 }
3117 }
3118 return have_one ? "other" : NULL;
3119 }
3120
3121 // Return a the last scope in (begin..end]
3122 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
3123 PcDesc* p = pc_desc_near(begin+1);
3124 if (p != NULL && p->real_pc(this) <= end) {
3125 return new ScopeDesc(this, p->scope_decode_offset(),
3126 p->obj_decode_offset(), p->should_reexecute(), p->rethrow_exception(),
3127 p->return_oop());
3128 }
3129 return NULL;
3130 }
3131
3132 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const {
3133 if (block_begin == entry_point()) stream->print_cr("[Entry Point]");
3134 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]");
3135 if (JVMCI_ONLY(_exception_offset >= 0 &&) block_begin == exception_begin()) stream->print_cr("[Exception Handler]");
3136 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]");
3137 if (JVMCI_ONLY(_deoptimize_offset >= 0 &&) block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]");
3138
3139 if (has_method_handle_invokes())
3140 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]");
3141
3142 if (block_begin == consts_begin()) stream->print_cr("[Constants]");
3143
3144 if (block_begin == entry_point()) {
3145 methodHandle m = method();
3146 if (m.not_null()) {
3147 stream->print(" # ");
3148 m->print_value_on(stream);
3149 stream->cr();
3150 }
3151 if (m.not_null() && !is_osr_method()) {
3152 ResourceMark rm;
3153 int sizeargs = m->size_of_parameters();
3154 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
3155 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
3156 {
3157 int sig_index = 0;
3283 if (invoke.name() != NULL)
3284 invoke.name()->print_symbol_on(st);
3285 else
3286 st->print("<UNKNOWN>");
3287 break;
3288 }
3289 case Bytecodes::_getfield:
3290 case Bytecodes::_putfield:
3291 case Bytecodes::_getstatic:
3292 case Bytecodes::_putstatic:
3293 {
3294 Bytecode_field field(sd->method(), sd->bci());
3295 st->print(" ");
3296 if (field.name() != NULL)
3297 field.name()->print_symbol_on(st);
3298 else
3299 st->print("<UNKNOWN>");
3300 }
3301 }
3302 }
3303 st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop());
3304 }
3305
3306 // Print all scopes
3307 for (;sd != NULL; sd = sd->sender()) {
3308 st->move_to(column);
3309 st->print("; -");
3310 if (sd->method() == NULL) {
3311 st->print("method is NULL");
3312 } else {
3313 sd->method()->print_short_name(st);
3314 }
3315 int lineno = sd->method()->line_number_from_bci(sd->bci());
3316 if (lineno != -1) {
3317 st->print("@%d (line %d)", sd->bci(), lineno);
3318 } else {
3319 st->print("@%d", sd->bci());
3320 }
3321 st->cr();
3322 }
3323 }
3356 }
3357 case relocInfo::static_call_type:
3358 st->print_cr("Static call at " INTPTR_FORMAT, iter.reloc()->addr());
3359 compiledStaticCall_at(iter.reloc())->print();
3360 break;
3361 }
3362 }
3363 }
3364
3365 void nmethod::print_handler_table() {
3366 ExceptionHandlerTable(this).print();
3367 }
3368
3369 void nmethod::print_nul_chk_table() {
3370 ImplicitExceptionTable(this).print(code_begin());
3371 }
3372
3373 void nmethod::print_statistics() {
3374 ttyLocker ttyl;
3375 if (xtty != NULL) xtty->head("statistics type='nmethod'");
3376 native_nmethod_stats.print_native_nmethod_stats();
3377 #ifdef COMPILER1
3378 c1_java_nmethod_stats.print_nmethod_stats("C1");
3379 #endif
3380 #ifdef COMPILER2
3381 c2_java_nmethod_stats.print_nmethod_stats("C2");
3382 #endif
3383 #if INCLUDE_JVMCI
3384 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI");
3385 #endif
3386 #ifdef SHARK
3387 shark_java_nmethod_stats.print_nmethod_stats("Shark");
3388 #endif
3389 unknown_java_nmethod_stats.print_nmethod_stats("Unknown");
3390 DebugInformationRecorder::print_statistics();
3391 #ifndef PRODUCT
3392 pc_nmethod_stats.print_pc_stats();
3393 #endif
3394 Dependencies::print_statistics();
3395 if (xtty != NULL) xtty->tail("statistics");
3396 }
3397
3398 #endif // !PRODUCT
3399
3400 #if INCLUDE_JVMCI
3401 char* nmethod::jvmci_installed_code_name(char* buf, size_t buflen) {
3402 if (!this->is_compiled_by_jvmci()) {
3403 return NULL;
3404 }
3405 oop installedCode = this->jvmci_installed_code();
3406 if (installedCode != NULL) {
3407 oop installedCodeName = NULL;
3408 if (installedCode->is_a(InstalledCode::klass())) {
3409 installedCodeName = InstalledCode::name(installedCode);
3410 }
3411 if (installedCodeName != NULL) {
3412 return java_lang_String::as_utf8_string(installedCodeName, buf, (int)buflen);
3413 } else {
3414 jio_snprintf(buf, buflen, "null");
3415 return buf;
3416 }
3417 }
3418 jio_snprintf(buf, buflen, "noInstalledCode");
3419 return buf;
3420 }
3421 #endif
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