1 /*
2 * Copyright 1997-2007 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 # include "incls/_precompiled.incl"
26 # include "incls/_nmethod.cpp.incl"
27
28 #ifdef DTRACE_ENABLED
29
30
31 // Only bother with this argument setup if dtrace is available
32
33 HS_DTRACE_PROBE_DECL8(hotspot, compiled__method__load,
34 const char*, int, const char*, int, const char*, int, void*, size_t);
35
36 HS_DTRACE_PROBE_DECL6(hotspot, compiled__method__unload,
37 char*, int, char*, int, char*, int);
38
39 #define DTRACE_METHOD_UNLOAD_PROBE(method) \
40 { \
41 methodOop m = (method); \
42 if (m != NULL) { \
43 symbolOop klass_name = m->klass_name(); \
44 symbolOop name = m->name(); \
45 symbolOop signature = m->signature(); \
46 HS_DTRACE_PROBE6(hotspot, compiled__method__unload, \
47 klass_name->bytes(), klass_name->utf8_length(), \
48 name->bytes(), name->utf8_length(), \
49 signature->bytes(), signature->utf8_length()); \
50 } \
51 }
52
53 #else // ndef DTRACE_ENABLED
54
55 #define DTRACE_METHOD_UNLOAD_PROBE(method)
56
57 #endif
58
59 bool nmethod::is_compiled_by_c1() const {
60 if (is_native_method()) return false;
61 assert(compiler() != NULL, "must be");
62 return compiler()->is_c1();
63 }
64 bool nmethod::is_compiled_by_c2() const {
65 if (is_native_method()) return false;
66 assert(compiler() != NULL, "must be");
67 return compiler()->is_c2();
68 }
69
70
71
72 //---------------------------------------------------------------------------------
73 // NMethod statistics
74 // They are printed under various flags, including:
75 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation.
76 // (In the latter two cases, they like other stats are printed to the log only.)
77
78 #ifndef PRODUCT
79 // These variables are put into one block to reduce relocations
80 // and make it simpler to print from the debugger.
81 static
82 struct nmethod_stats_struct {
83 int nmethod_count;
84 int total_size;
85 int relocation_size;
86 int code_size;
87 int stub_size;
88 int consts_size;
89 int scopes_data_size;
90 int scopes_pcs_size;
91 int dependencies_size;
92 int handler_table_size;
93 int nul_chk_table_size;
94 int oops_size;
95
96 void note_nmethod(nmethod* nm) {
97 nmethod_count += 1;
98 total_size += nm->size();
99 relocation_size += nm->relocation_size();
100 code_size += nm->code_size();
101 stub_size += nm->stub_size();
102 consts_size += nm->consts_size();
103 scopes_data_size += nm->scopes_data_size();
104 scopes_pcs_size += nm->scopes_pcs_size();
105 dependencies_size += nm->dependencies_size();
106 handler_table_size += nm->handler_table_size();
107 nul_chk_table_size += nm->nul_chk_table_size();
108 oops_size += nm->oops_size();
109 }
110 void print_nmethod_stats() {
111 if (nmethod_count == 0) return;
112 tty->print_cr("Statistics for %d bytecoded nmethods:", nmethod_count);
113 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size);
114 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size);
115 if (code_size != 0) tty->print_cr(" main code = %d", code_size);
116 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size);
117 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size);
118 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size);
119 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size);
120 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size);
121 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size);
122 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size);
123 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size);
124 }
125
126 int native_nmethod_count;
127 int native_total_size;
128 int native_relocation_size;
129 int native_code_size;
130 int native_oops_size;
131 void note_native_nmethod(nmethod* nm) {
132 native_nmethod_count += 1;
133 native_total_size += nm->size();
134 native_relocation_size += nm->relocation_size();
135 native_code_size += nm->code_size();
136 native_oops_size += nm->oops_size();
137 }
138 void print_native_nmethod_stats() {
139 if (native_nmethod_count == 0) return;
140 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count);
141 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size);
142 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size);
143 if (native_code_size != 0) tty->print_cr(" N. main code = %d", native_code_size);
144 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size);
145 }
146
147 int pc_desc_resets; // number of resets (= number of caches)
148 int pc_desc_queries; // queries to nmethod::find_pc_desc
149 int pc_desc_approx; // number of those which have approximate true
150 int pc_desc_repeats; // number of _last_pc_desc hits
151 int pc_desc_hits; // number of LRU cache hits
152 int pc_desc_tests; // total number of PcDesc examinations
153 int pc_desc_searches; // total number of quasi-binary search steps
154 int pc_desc_adds; // number of LUR cache insertions
155
156 void print_pc_stats() {
157 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query",
158 pc_desc_queries,
159 (double)(pc_desc_tests + pc_desc_searches)
160 / pc_desc_queries);
161 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d",
162 pc_desc_resets,
163 pc_desc_queries, pc_desc_approx,
164 pc_desc_repeats, pc_desc_hits,
165 pc_desc_tests, pc_desc_searches, pc_desc_adds);
166 }
167 } nmethod_stats;
168 #endif //PRODUCT
169
170 //---------------------------------------------------------------------------------
171
172
173 // The _unwind_handler is a special marker address, which says that
174 // for given exception oop and address, the frame should be removed
175 // as the tuple cannot be caught in the nmethod
176 address ExceptionCache::_unwind_handler = (address) -1;
177
178
179 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) {
180 assert(pc != NULL, "Must be non null");
181 assert(exception.not_null(), "Must be non null");
182 assert(handler != NULL, "Must be non null");
183
184 _count = 0;
185 _exception_type = exception->klass();
186 _next = NULL;
187
188 add_address_and_handler(pc,handler);
189 }
190
191
192 address ExceptionCache::match(Handle exception, address pc) {
193 assert(pc != NULL,"Must be non null");
194 assert(exception.not_null(),"Must be non null");
195 if (exception->klass() == exception_type()) {
196 return (test_address(pc));
197 }
198
199 return NULL;
200 }
201
202
203 bool ExceptionCache::match_exception_with_space(Handle exception) {
204 assert(exception.not_null(),"Must be non null");
205 if (exception->klass() == exception_type() && count() < cache_size) {
206 return true;
207 }
208 return false;
209 }
210
211
212 address ExceptionCache::test_address(address addr) {
213 for (int i=0; i<count(); i++) {
214 if (pc_at(i) == addr) {
215 return handler_at(i);
216 }
217 }
218 return NULL;
219 }
220
221
222 bool ExceptionCache::add_address_and_handler(address addr, address handler) {
223 if (test_address(addr) == handler) return true;
224 if (count() < cache_size) {
225 set_pc_at(count(),addr);
226 set_handler_at(count(), handler);
227 increment_count();
228 return true;
229 }
230 return false;
231 }
232
233
234 // private method for handling exception cache
235 // These methods are private, and used to manipulate the exception cache
236 // directly.
237 ExceptionCache* nmethod::exception_cache_entry_for_exception(Handle exception) {
238 ExceptionCache* ec = exception_cache();
239 while (ec != NULL) {
240 if (ec->match_exception_with_space(exception)) {
241 return ec;
242 }
243 ec = ec->next();
244 }
245 return NULL;
246 }
247
248
249 //-----------------------------------------------------------------------------
250
251
252 // Helper used by both find_pc_desc methods.
253 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) {
254 NOT_PRODUCT(++nmethod_stats.pc_desc_tests);
255 if (!approximate)
256 return pc->pc_offset() == pc_offset;
257 else
258 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset();
259 }
260
261 void PcDescCache::reset_to(PcDesc* initial_pc_desc) {
262 if (initial_pc_desc == NULL) {
263 _last_pc_desc = NULL; // native method
264 return;
265 }
266 NOT_PRODUCT(++nmethod_stats.pc_desc_resets);
267 // reset the cache by filling it with benign (non-null) values
268 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel");
269 _last_pc_desc = initial_pc_desc + 1; // first valid one is after sentinel
270 for (int i = 0; i < cache_size; i++)
271 _pc_descs[i] = initial_pc_desc;
272 }
273
274 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) {
275 NOT_PRODUCT(++nmethod_stats.pc_desc_queries);
276 NOT_PRODUCT(if (approximate) ++nmethod_stats.pc_desc_approx);
277
278 // In order to prevent race conditions do not load cache elements
279 // repeatedly, but use a local copy:
280 PcDesc* res;
281
282 // Step one: Check the most recently returned value.
283 res = _last_pc_desc;
284 if (res == NULL) return NULL; // native method; no PcDescs at all
285 if (match_desc(res, pc_offset, approximate)) {
286 NOT_PRODUCT(++nmethod_stats.pc_desc_repeats);
287 return res;
288 }
289
290 // Step two: Check the LRU cache.
291 for (int i = 0; i < cache_size; i++) {
292 res = _pc_descs[i];
293 if (res->pc_offset() < 0) break; // optimization: skip empty cache
294 if (match_desc(res, pc_offset, approximate)) {
295 NOT_PRODUCT(++nmethod_stats.pc_desc_hits);
296 _last_pc_desc = res; // record this cache hit in case of repeat
297 return res;
298 }
299 }
300
301 // Report failure.
302 return NULL;
303 }
304
305 void PcDescCache::add_pc_desc(PcDesc* pc_desc) {
306 NOT_PRODUCT(++nmethod_stats.pc_desc_adds);
307 // Update the LRU cache by shifting pc_desc forward:
308 for (int i = 0; i < cache_size; i++) {
309 PcDesc* next = _pc_descs[i];
310 _pc_descs[i] = pc_desc;
311 pc_desc = next;
312 }
313 // Note: Do not update _last_pc_desc. It fronts for the LRU cache.
314 }
315
316 // adjust pcs_size so that it is a multiple of both oopSize and
317 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple
318 // of oopSize, then 2*sizeof(PcDesc) is)
319 static int adjust_pcs_size(int pcs_size) {
320 int nsize = round_to(pcs_size, oopSize);
321 if ((nsize % sizeof(PcDesc)) != 0) {
322 nsize = pcs_size + sizeof(PcDesc);
323 }
324 assert((nsize % oopSize) == 0, "correct alignment");
325 return nsize;
326 }
327
328 //-----------------------------------------------------------------------------
329
330
331 void nmethod::add_exception_cache_entry(ExceptionCache* new_entry) {
332 assert(ExceptionCache_lock->owned_by_self(),"Must hold the ExceptionCache_lock");
333 assert(new_entry != NULL,"Must be non null");
334 assert(new_entry->next() == NULL, "Must be null");
335
336 if (exception_cache() != NULL) {
337 new_entry->set_next(exception_cache());
338 }
339 set_exception_cache(new_entry);
340 }
341
342 void nmethod::remove_from_exception_cache(ExceptionCache* ec) {
343 ExceptionCache* prev = NULL;
344 ExceptionCache* curr = exception_cache();
345 assert(curr != NULL, "nothing to remove");
346 // find the previous and next entry of ec
347 while (curr != ec) {
348 prev = curr;
349 curr = curr->next();
350 assert(curr != NULL, "ExceptionCache not found");
351 }
352 // now: curr == ec
353 ExceptionCache* next = curr->next();
354 if (prev == NULL) {
355 set_exception_cache(next);
356 } else {
357 prev->set_next(next);
358 }
359 delete curr;
360 }
361
362
363 // public method for accessing the exception cache
364 // These are the public access methods.
365 address nmethod::handler_for_exception_and_pc(Handle exception, address pc) {
366 // We never grab a lock to read the exception cache, so we may
367 // have false negatives. This is okay, as it can only happen during
368 // the first few exception lookups for a given nmethod.
369 ExceptionCache* ec = exception_cache();
370 while (ec != NULL) {
371 address ret_val;
372 if ((ret_val = ec->match(exception,pc)) != NULL) {
373 return ret_val;
374 }
375 ec = ec->next();
376 }
377 return NULL;
378 }
379
380
381 void nmethod::add_handler_for_exception_and_pc(Handle exception, address pc, address handler) {
382 // There are potential race conditions during exception cache updates, so we
383 // must own the ExceptionCache_lock before doing ANY modifications. Because
384 // we dont lock during reads, it is possible to have several threads attempt
385 // to update the cache with the same data. We need to check for already inserted
386 // copies of the current data before adding it.
387
388 MutexLocker ml(ExceptionCache_lock);
389 ExceptionCache* target_entry = exception_cache_entry_for_exception(exception);
390
391 if (target_entry == NULL || !target_entry->add_address_and_handler(pc,handler)) {
392 target_entry = new ExceptionCache(exception,pc,handler);
393 add_exception_cache_entry(target_entry);
394 }
395 }
396
397
398 //-------------end of code for ExceptionCache--------------
399
400
401 void nmFlags::clear() {
402 assert(sizeof(nmFlags) == sizeof(int), "using more than one word for nmFlags");
403 *(jint*)this = 0;
404 }
405
406 int nmethod::total_size() const {
407 return
408 code_size() +
409 stub_size() +
410 consts_size() +
411 scopes_data_size() +
412 scopes_pcs_size() +
413 handler_table_size() +
414 nul_chk_table_size();
415 }
416
417 const char* nmethod::compile_kind() const {
418 if (method() == NULL) return "unloaded";
419 if (is_native_method()) return "c2n";
420 if (is_osr_method()) return "osr";
421 return NULL;
422 }
423
424 // %%% This variable is no longer used?
425 int nmethod::_zombie_instruction_size = NativeJump::instruction_size;
426
427
428 nmethod* nmethod::new_native_nmethod(methodHandle method,
429 CodeBuffer *code_buffer,
430 int vep_offset,
431 int frame_complete,
432 int frame_size,
433 ByteSize basic_lock_owner_sp_offset,
434 ByteSize basic_lock_sp_offset,
435 OopMapSet* oop_maps) {
436 // create nmethod
437 nmethod* nm = NULL;
438 {
439 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
440 int native_nmethod_size = allocation_size(code_buffer, sizeof(nmethod));
441 const int dummy = -1; // Flag to force proper "operator new"
442 CodeOffsets offsets;
443 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
444 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
445 nm = new (native_nmethod_size)
446 nmethod(method(), native_nmethod_size, &offsets,
447 code_buffer, frame_size,
448 basic_lock_owner_sp_offset, basic_lock_sp_offset,
449 oop_maps);
450 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_native_nmethod(nm));
451 if (PrintAssembly && nm != NULL)
452 Disassembler::decode(nm);
453 }
454 // verify nmethod
455 debug_only(if (nm) nm->verify();) // might block
456
457 if (nm != NULL) {
458 nm->log_new_nmethod();
459 }
460
461 return nm;
462 }
463
464 nmethod* nmethod::new_nmethod(methodHandle method,
465 int compile_id,
466 int entry_bci,
467 CodeOffsets* offsets,
468 int orig_pc_offset,
469 DebugInformationRecorder* debug_info,
470 Dependencies* dependencies,
471 CodeBuffer* code_buffer, int frame_size,
472 OopMapSet* oop_maps,
473 ExceptionHandlerTable* handler_table,
474 ImplicitExceptionTable* nul_chk_table,
475 AbstractCompiler* compiler,
476 int comp_level
477 )
478 {
479 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
480 // create nmethod
481 nmethod* nm = NULL;
482 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
483 int nmethod_size =
484 allocation_size(code_buffer, sizeof(nmethod))
485 + adjust_pcs_size(debug_info->pcs_size())
486 + round_to(dependencies->size_in_bytes() , oopSize)
487 + round_to(handler_table->size_in_bytes(), oopSize)
488 + round_to(nul_chk_table->size_in_bytes(), oopSize)
489 + round_to(debug_info->data_size() , oopSize);
490 nm = new (nmethod_size)
491 nmethod(method(), nmethod_size, compile_id, entry_bci, offsets,
492 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size,
493 oop_maps,
494 handler_table,
495 nul_chk_table,
496 compiler,
497 comp_level);
498 if (nm != NULL) {
499 // To make dependency checking during class loading fast, record
500 // the nmethod dependencies in the classes it is dependent on.
501 // This allows the dependency checking code to simply walk the
502 // class hierarchy above the loaded class, checking only nmethods
503 // which are dependent on those classes. The slow way is to
504 // check every nmethod for dependencies which makes it linear in
505 // the number of methods compiled. For applications with a lot
506 // classes the slow way is too slow.
507 for (Dependencies::DepStream deps(nm); deps.next(); ) {
508 klassOop klass = deps.context_type();
509 if (klass == NULL) continue; // ignore things like evol_method
510
511 // record this nmethod as dependent on this klass
512 instanceKlass::cast(klass)->add_dependent_nmethod(nm);
513 }
514 }
515 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_nmethod(nm));
516 if (PrintAssembly && nm != NULL)
517 Disassembler::decode(nm);
518 }
519
520 // verify nmethod
521 debug_only(if (nm) nm->verify();) // might block
522
523 if (nm != NULL) {
524 nm->log_new_nmethod();
525 }
526
527 // done
528 return nm;
529 }
530
531
532 // For native wrappers
533 nmethod::nmethod(
534 methodOop method,
535 int nmethod_size,
536 CodeOffsets* offsets,
537 CodeBuffer* code_buffer,
538 int frame_size,
539 ByteSize basic_lock_owner_sp_offset,
540 ByteSize basic_lock_sp_offset,
541 OopMapSet* oop_maps )
542 : CodeBlob("native nmethod", code_buffer, sizeof(nmethod),
543 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps),
544 _compiled_synchronized_native_basic_lock_owner_sp_offset(basic_lock_owner_sp_offset),
545 _compiled_synchronized_native_basic_lock_sp_offset(basic_lock_sp_offset)
546 {
547 {
548 debug_only(No_Safepoint_Verifier nsv;)
549 assert_locked_or_safepoint(CodeCache_lock);
550
551 NOT_PRODUCT(_has_debug_info = false; )
552 _method = method;
553 _entry_bci = InvocationEntryBci;
554 _link = NULL;
555 _compiler = NULL;
556 // We have no exception handler or deopt handler make the
557 // values something that will never match a pc like the nmethod vtable entry
558 _exception_offset = 0;
559 _deoptimize_offset = 0;
560 _orig_pc_offset = 0;
561 _stub_offset = data_offset();
562 _consts_offset = data_offset();
563 _scopes_data_offset = data_offset();
564 _scopes_pcs_offset = _scopes_data_offset;
565 _dependencies_offset = _scopes_pcs_offset;
566 _handler_table_offset = _dependencies_offset;
567 _nul_chk_table_offset = _handler_table_offset;
568 _nmethod_end_offset = _nul_chk_table_offset;
569 _compile_id = 0; // default
570 _comp_level = CompLevel_none;
571 _entry_point = instructions_begin();
572 _verified_entry_point = instructions_begin() + offsets->value(CodeOffsets::Verified_Entry);
573 _osr_entry_point = NULL;
574 _exception_cache = NULL;
575 _pc_desc_cache.reset_to(NULL);
576
577 flags.clear();
578 flags.state = alive;
579 _markedForDeoptimization = 0;
580
581 _lock_count = 0;
582 _stack_traversal_mark = 0;
583
584 code_buffer->copy_oops_to(this);
585 debug_only(check_store();)
586 CodeCache::commit(this);
587 VTune::create_nmethod(this);
588 }
589
590 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
591 ttyLocker ttyl; // keep the following output all in one block
592 // This output goes directly to the tty, not the compiler log.
593 // To enable tools to match it up with the compilation activity,
594 // be sure to tag this tty output with the compile ID.
595 if (xtty != NULL) {
596 xtty->begin_head("print_native_nmethod");
597 xtty->method(_method);
598 xtty->stamp();
599 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
600 }
601 // print the header part first
602 print();
603 // then print the requested information
604 if (PrintNativeNMethods) {
605 print_code();
606 oop_maps->print();
607 }
608 if (PrintRelocations) {
609 print_relocations();
610 }
611 if (xtty != NULL) {
612 xtty->tail("print_native_nmethod");
613 }
614 }
615 Events::log("Create nmethod " INTPTR_FORMAT, this);
616 }
617
618
619 void* nmethod::operator new(size_t size, int nmethod_size) {
620 // Always leave some room in the CodeCache for I2C/C2I adapters
621 if (CodeCache::unallocated_capacity() < CodeCacheMinimumFreeSpace) return NULL;
622 return CodeCache::allocate(nmethod_size);
623 }
624
625
626 nmethod::nmethod(
627 methodOop method,
628 int nmethod_size,
629 int compile_id,
630 int entry_bci,
631 CodeOffsets* offsets,
632 int orig_pc_offset,
633 DebugInformationRecorder* debug_info,
634 Dependencies* dependencies,
635 CodeBuffer *code_buffer,
636 int frame_size,
637 OopMapSet* oop_maps,
638 ExceptionHandlerTable* handler_table,
639 ImplicitExceptionTable* nul_chk_table,
640 AbstractCompiler* compiler,
641 int comp_level
642 )
643 : CodeBlob("nmethod", code_buffer, sizeof(nmethod),
644 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps),
645 _compiled_synchronized_native_basic_lock_owner_sp_offset(in_ByteSize(-1)),
646 _compiled_synchronized_native_basic_lock_sp_offset(in_ByteSize(-1))
647 {
648 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
649 {
650 debug_only(No_Safepoint_Verifier nsv;)
651 assert_locked_or_safepoint(CodeCache_lock);
652
653 NOT_PRODUCT(_has_debug_info = false; )
654 _method = method;
655 _compile_id = compile_id;
656 _comp_level = comp_level;
657 _entry_bci = entry_bci;
658 _link = NULL;
659 _compiler = compiler;
660 _orig_pc_offset = orig_pc_offset;
661 _stub_offset = instructions_offset() + code_buffer->total_offset_of(code_buffer->stubs()->start());
662
663 // Exception handler and deopt handler are in the stub section
664 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
665 _deoptimize_offset = _stub_offset + offsets->value(CodeOffsets::Deopt);
666 _consts_offset = instructions_offset() + code_buffer->total_offset_of(code_buffer->consts()->start());
667 _scopes_data_offset = data_offset();
668 _scopes_pcs_offset = _scopes_data_offset + round_to(debug_info->data_size (), oopSize);
669 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
670 _handler_table_offset = _dependencies_offset + round_to(dependencies->size_in_bytes (), oopSize);
671 _nul_chk_table_offset = _handler_table_offset + round_to(handler_table->size_in_bytes(), oopSize);
672 _nmethod_end_offset = _nul_chk_table_offset + round_to(nul_chk_table->size_in_bytes(), oopSize);
673
674 _entry_point = instructions_begin();
675 _verified_entry_point = instructions_begin() + offsets->value(CodeOffsets::Verified_Entry);
676 _osr_entry_point = instructions_begin() + offsets->value(CodeOffsets::OSR_Entry);
677 _exception_cache = NULL;
678 _pc_desc_cache.reset_to(scopes_pcs_begin());
679
680 flags.clear();
681 flags.state = alive;
682 _markedForDeoptimization = 0;
683
684 _unload_reported = false; // jvmti state
685
686 _lock_count = 0;
687 _stack_traversal_mark = 0;
688
689 // Copy contents of ScopeDescRecorder to nmethod
690 code_buffer->copy_oops_to(this);
691 debug_info->copy_to(this);
692 dependencies->copy_to(this);
693 debug_only(check_store();)
694
695 CodeCache::commit(this);
696
697 VTune::create_nmethod(this);
698
699 // Copy contents of ExceptionHandlerTable to nmethod
700 handler_table->copy_to(this);
701 nul_chk_table->copy_to(this);
702
703 // we use the information of entry points to find out if a method is
704 // static or non static
705 assert(compiler->is_c2() ||
706 _method->is_static() == (entry_point() == _verified_entry_point),
707 " entry points must be same for static methods and vice versa");
708 }
709
710 bool printnmethods = PrintNMethods || CompilerOracle::has_option_string(_method, "PrintNMethods");
711 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
712 print_nmethod(printnmethods);
713 }
714
715 // Note: Do not verify in here as the CodeCache_lock is
716 // taken which would conflict with the CompiledIC_lock
717 // which taken during the verification of call sites.
718 // (was bug - gri 10/25/99)
719
720 Events::log("Create nmethod " INTPTR_FORMAT, this);
721 }
722
723
724 // Print a short set of xml attributes to identify this nmethod. The
725 // output should be embedded in some other element.
726 void nmethod::log_identity(xmlStream* log) const {
727 log->print(" compile_id='%d'", compile_id());
728 const char* nm_kind = compile_kind();
729 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind);
730 if (compiler() != NULL) {
731 log->print(" compiler='%s'", compiler()->name());
732 }
733 #ifdef TIERED
734 log->print(" level='%d'", comp_level());
735 #endif // TIERED
736 }
737
738
739 #define LOG_OFFSET(log, name) \
740 if ((intptr_t)name##_end() - (intptr_t)name##_begin()) \
741 log->print(" " XSTR(name) "_offset='%d'" , \
742 (intptr_t)name##_begin() - (intptr_t)this)
743
744
745 void nmethod::log_new_nmethod() const {
746 if (LogCompilation && xtty != NULL) {
747 ttyLocker ttyl;
748 HandleMark hm;
749 xtty->begin_elem("nmethod");
750 log_identity(xtty);
751 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'",
752 instructions_begin(), size());
753 xtty->print(" address='" INTPTR_FORMAT "'", (intptr_t) this);
754
755 LOG_OFFSET(xtty, relocation);
756 LOG_OFFSET(xtty, code);
757 LOG_OFFSET(xtty, stub);
758 LOG_OFFSET(xtty, consts);
759 LOG_OFFSET(xtty, scopes_data);
760 LOG_OFFSET(xtty, scopes_pcs);
761 LOG_OFFSET(xtty, dependencies);
762 LOG_OFFSET(xtty, handler_table);
763 LOG_OFFSET(xtty, nul_chk_table);
764 LOG_OFFSET(xtty, oops);
765
766 xtty->method(method());
767 xtty->stamp();
768 xtty->end_elem();
769 }
770 }
771
772 #undef LOG_OFFSET
773
774
775 // Print out more verbose output usually for a newly created nmethod.
776 void nmethod::print_on(outputStream* st, const char* title) const {
777 if (st != NULL) {
778 ttyLocker ttyl;
779 // Print a little tag line that looks like +PrintCompilation output:
780 st->print("%3d%c %s",
781 compile_id(),
782 is_osr_method() ? '%' :
783 method() != NULL &&
784 is_native_method() ? 'n' : ' ',
785 title);
786 #ifdef TIERED
787 st->print(" (%d) ", comp_level());
788 #endif // TIERED
789 if (WizardMode) st->print(" (" INTPTR_FORMAT ")", this);
790 if (method() != NULL) {
791 method()->print_short_name(st);
792 if (is_osr_method())
793 st->print(" @ %d", osr_entry_bci());
794 if (method()->code_size() > 0)
795 st->print(" (%d bytes)", method()->code_size());
796 }
797 }
798 }
799
800
801 #ifndef PRODUCT
802 void nmethod::print_nmethod(bool printmethod) {
803 ttyLocker ttyl; // keep the following output all in one block
804 if (xtty != NULL) {
805 xtty->begin_head("print_nmethod");
806 xtty->stamp();
807 xtty->end_head();
808 }
809 // print the header part first
810 print();
811 // then print the requested information
812 if (printmethod) {
813 print_code();
814 print_pcs();
815 oop_maps()->print();
816 }
817 if (PrintDebugInfo) {
818 print_scopes();
819 }
820 if (PrintRelocations) {
821 print_relocations();
822 }
823 if (PrintDependencies) {
824 print_dependencies();
825 }
826 if (PrintExceptionHandlers) {
827 print_handler_table();
828 print_nul_chk_table();
829 }
830 if (xtty != NULL) {
831 xtty->tail("print_nmethod");
832 }
833 }
834 #endif
835
836
837 void nmethod::set_version(int v) {
838 flags.version = v;
839 }
840
841
842 ScopeDesc* nmethod::scope_desc_at(address pc) {
843 PcDesc* pd = pc_desc_at(pc);
844 guarantee(pd != NULL, "scope must be present");
845 return new ScopeDesc(this, pd->scope_decode_offset(),
846 pd->obj_decode_offset());
847 }
848
849
850 void nmethod::clear_inline_caches() {
851 assert(SafepointSynchronize::is_at_safepoint(), "cleaning of IC's only allowed at safepoint");
852 if (is_zombie()) {
853 return;
854 }
855
856 RelocIterator iter(this);
857 while (iter.next()) {
858 iter.reloc()->clear_inline_cache();
859 }
860 }
861
862
863 void nmethod::cleanup_inline_caches() {
864
865 assert(SafepointSynchronize::is_at_safepoint() &&
866 !CompiledIC_lock->is_locked() &&
867 !Patching_lock->is_locked(), "no threads must be updating the inline caches by them selfs");
868
869 // If the method is not entrant or zombie then a JMP is plastered over the
870 // first few bytes. If an oop in the old code was there, that oop
871 // should not get GC'd. Skip the first few bytes of oops on
872 // not-entrant methods.
873 address low_boundary = verified_entry_point();
874 if (!is_in_use()) {
875 low_boundary += NativeJump::instruction_size;
876 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
877 // This means that the low_boundary is going to be a little too high.
878 // This shouldn't matter, since oops of non-entrant methods are never used.
879 // In fact, why are we bothering to look at oops in a non-entrant method??
880 }
881
882 // Find all calls in an nmethod, and clear the ones that points to zombie methods
883 ResourceMark rm;
884 RelocIterator iter(this, low_boundary);
885 while(iter.next()) {
886 switch(iter.type()) {
887 case relocInfo::virtual_call_type:
888 case relocInfo::opt_virtual_call_type: {
889 CompiledIC *ic = CompiledIC_at(iter.reloc());
890 // Ok, to lookup references to zombies here
891 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
892 if( cb != NULL && cb->is_nmethod() ) {
893 nmethod* nm = (nmethod*)cb;
894 // Clean inline caches pointing to both zombie and not_entrant methods
895 if (!nm->is_in_use()) ic->set_to_clean();
896 }
897 break;
898 }
899 case relocInfo::static_call_type: {
900 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
901 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
902 if( cb != NULL && cb->is_nmethod() ) {
903 nmethod* nm = (nmethod*)cb;
904 // Clean inline caches pointing to both zombie and not_entrant methods
905 if (!nm->is_in_use()) csc->set_to_clean();
906 }
907 break;
908 }
909 }
910 }
911 }
912
913 void nmethod::mark_as_seen_on_stack() {
914 assert(is_not_entrant(), "must be a non-entrant method");
915 set_stack_traversal_mark(NMethodSweeper::traversal_count());
916 }
917
918 // Tell if a non-entrant method can be converted to a zombie (i.e., there is no activations on the stack)
919 bool nmethod::can_not_entrant_be_converted() {
920 assert(is_not_entrant(), "must be a non-entrant method");
921 assert(SafepointSynchronize::is_at_safepoint(), "must be called during a safepoint");
922
923 // Since the nmethod sweeper only does partial sweep the sweeper's traversal
924 // count can be greater than the stack traversal count before it hits the
925 // nmethod for the second time.
926 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count();
927 }
928
929 void nmethod::inc_decompile_count() {
930 // Could be gated by ProfileTraps, but do not bother...
931 methodOop m = method();
932 if (m == NULL) return;
933 methodDataOop mdo = m->method_data();
934 if (mdo == NULL) return;
935 // There is a benign race here. See comments in methodDataOop.hpp.
936 mdo->inc_decompile_count();
937 }
938
939 void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) {
940
941 post_compiled_method_unload();
942
943 // Since this nmethod is being unloaded, make sure that dependencies
944 // recorded in instanceKlasses get flushed and pass non-NULL closure to
945 // indicate that this work is being done during a GC.
946 assert(Universe::heap()->is_gc_active(), "should only be called during gc");
947 assert(is_alive != NULL, "Should be non-NULL");
948 // A non-NULL is_alive closure indicates that this is being called during GC.
949 flush_dependencies(is_alive);
950
951 // Break cycle between nmethod & method
952 if (TraceClassUnloading && WizardMode) {
953 tty->print_cr("[Class unloading: Making nmethod " INTPTR_FORMAT
954 " unloadable], methodOop(" INTPTR_FORMAT
955 "), cause(" INTPTR_FORMAT ")",
956 this, (address)_method, (address)cause);
957 cause->klass()->print();
958 }
959 // If _method is already NULL the methodOop is about to be unloaded,
960 // so we don't have to break the cycle. Note that it is possible to
961 // have the methodOop live here, in case we unload the nmethod because
962 // it is pointing to some oop (other than the methodOop) being unloaded.
963 if (_method != NULL) {
964 // OSR methods point to the methodOop, but the methodOop does not
965 // point back!
966 if (_method->code() == this) {
967 _method->clear_code(); // Break a cycle
968 }
969 inc_decompile_count(); // Last chance to make a mark on the MDO
970 _method = NULL; // Clear the method of this dead nmethod
971 }
972 // Make the class unloaded - i.e., change state and notify sweeper
973 check_safepoint();
974 if (is_in_use()) {
975 // Transitioning directly from live to unloaded -- so
976 // we need to force a cache clean-up; remember this
977 // for later on.
978 CodeCache::set_needs_cache_clean(true);
979 }
980 flags.state = unloaded;
981
982 // The methodOop is gone at this point
983 assert(_method == NULL, "Tautology");
984
985 set_link(NULL);
986 NMethodSweeper::notify(this);
987 }
988
989 void nmethod::invalidate_osr_method() {
990 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
991 if (_entry_bci != InvalidOSREntryBci)
992 inc_decompile_count();
993 // Remove from list of active nmethods
994 if (method() != NULL)
995 instanceKlass::cast(method()->method_holder())->remove_osr_nmethod(this);
996 // Set entry as invalid
997 _entry_bci = InvalidOSREntryBci;
998 }
999
1000 void nmethod::log_state_change(int state) const {
1001 if (LogCompilation) {
1002 if (xtty != NULL) {
1003 ttyLocker ttyl; // keep the following output all in one block
1004 xtty->begin_elem("make_not_entrant %sthread='" UINTX_FORMAT "'",
1005 (state == zombie ? "zombie='1' " : ""),
1006 os::current_thread_id());
1007 log_identity(xtty);
1008 xtty->stamp();
1009 xtty->end_elem();
1010 }
1011 }
1012 if (PrintCompilation) {
1013 print_on(tty, state == zombie ? "made zombie " : "made not entrant ");
1014 tty->cr();
1015 }
1016 }
1017
1018 // Common functionality for both make_not_entrant and make_zombie
1019 void nmethod::make_not_entrant_or_zombie(int state) {
1020 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant");
1021
1022 // Code for an on-stack-replacement nmethod is removed when a class gets unloaded.
1023 // They never become zombie/non-entrant, so the nmethod sweeper will never remove
1024 // them. Instead the entry_bci is set to InvalidOSREntryBci, so the osr nmethod
1025 // will never be used anymore. That the nmethods only gets removed when class unloading
1026 // happens, make life much simpler, since the nmethods are not just going to disappear
1027 // out of the blue.
1028 if (is_osr_only_method()) {
1029 if (osr_entry_bci() != InvalidOSREntryBci) {
1030 // only log this once
1031 log_state_change(state);
1032 }
1033 invalidate_osr_method();
1034 return;
1035 }
1036
1037 // If the method is already zombie or set to the state we want, nothing to do
1038 if (is_zombie() || (state == not_entrant && is_not_entrant())) {
1039 return;
1040 }
1041
1042 log_state_change(state);
1043
1044 // Make sure the nmethod is not flushed in case of a safepoint in code below.
1045 nmethodLocker nml(this);
1046
1047 {
1048 // Enter critical section. Does not block for safepoint.
1049 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1050 // The caller can be calling the method statically or through an inline
1051 // cache call.
1052 if (!is_not_entrant()) {
1053 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
1054 SharedRuntime::get_handle_wrong_method_stub());
1055 assert (NativeJump::instruction_size == nmethod::_zombie_instruction_size, "");
1056 }
1057
1058 // When the nmethod becomes zombie it is no longer alive so the
1059 // dependencies must be flushed. nmethods in the not_entrant
1060 // state will be flushed later when the transition to zombie
1061 // happens or they get unloaded.
1062 if (state == zombie) {
1063 assert(SafepointSynchronize::is_at_safepoint(), "must be done at safepoint");
1064 flush_dependencies(NULL);
1065 } else {
1066 assert(state == not_entrant, "other cases may need to be handled differently");
1067 }
1068
1069 // Change state
1070 flags.state = state;
1071 } // leave critical region under Patching_lock
1072
1073 if (state == not_entrant) {
1074 Events::log("Make nmethod not entrant " INTPTR_FORMAT, this);
1075 } else {
1076 Events::log("Make nmethod zombie " INTPTR_FORMAT, this);
1077 }
1078
1079 if (TraceCreateZombies) {
1080 tty->print_cr("nmethod <" INTPTR_FORMAT "> code made %s", this, (state == not_entrant) ? "not entrant" : "zombie");
1081 }
1082
1083 // Make sweeper aware that there is a zombie method that needs to be removed
1084 NMethodSweeper::notify(this);
1085
1086 // not_entrant only stuff
1087 if (state == not_entrant) {
1088 mark_as_seen_on_stack();
1089 }
1090
1091 // It's a true state change, so mark the method as decompiled.
1092 inc_decompile_count();
1093
1094
1095 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload event
1096 // and it hasn't already been reported for this nmethod then report it now.
1097 // (the event may have been reported earilier if the GC marked it for unloading).
1098 if (state == zombie) {
1099
1100 DTRACE_METHOD_UNLOAD_PROBE(method());
1101
1102 if (JvmtiExport::should_post_compiled_method_unload() &&
1103 !unload_reported()) {
1104 assert(method() != NULL, "checking");
1105 {
1106 HandleMark hm;
1107 JvmtiExport::post_compiled_method_unload_at_safepoint(
1108 method()->jmethod_id(), code_begin());
1109 }
1110 set_unload_reported();
1111 }
1112 }
1113
1114
1115 // Zombie only stuff
1116 if (state == zombie) {
1117 VTune::delete_nmethod(this);
1118 }
1119
1120 // Check whether method got unloaded at a safepoint before this,
1121 // if so we can skip the flushing steps below
1122 if (method() == NULL) return;
1123
1124 // Remove nmethod from method.
1125 // We need to check if both the _code and _from_compiled_code_entry_point
1126 // refer to this nmethod because there is a race in setting these two fields
1127 // in methodOop as seen in bugid 4947125.
1128 // If the vep() points to the zombie nmethod, the memory for the nmethod
1129 // could be flushed and the compiler and vtable stubs could still call
1130 // through it.
1131 if (method()->code() == this ||
1132 method()->from_compiled_entry() == verified_entry_point()) {
1133 HandleMark hm;
1134 method()->clear_code();
1135 }
1136 }
1137
1138
1139 #ifndef PRODUCT
1140 void nmethod::check_safepoint() {
1141 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
1142 }
1143 #endif
1144
1145
1146 void nmethod::flush() {
1147 // Note that there are no valid oops in the nmethod anymore.
1148 assert(is_zombie() || (is_osr_method() && is_unloaded()), "must be a zombie method");
1149 assert(is_marked_for_reclamation() || (is_osr_method() && is_unloaded()), "must be marked for reclamation");
1150
1151 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed");
1152 check_safepoint();
1153
1154 // completely deallocate this method
1155 EventMark m("flushing nmethod " INTPTR_FORMAT " %s", this, "");
1156 if (PrintMethodFlushing) {
1157 tty->print_cr("*flushing nmethod " INTPTR_FORMAT ". Live blobs: %d", this, CodeCache::nof_blobs());
1158 }
1159
1160 // We need to deallocate any ExceptionCache data.
1161 // Note that we do not need to grab the nmethod lock for this, it
1162 // better be thread safe if we're disposing of it!
1163 ExceptionCache* ec = exception_cache();
1164 set_exception_cache(NULL);
1165 while(ec != NULL) {
1166 ExceptionCache* next = ec->next();
1167 delete ec;
1168 ec = next;
1169 }
1170
1171 ((CodeBlob*)(this))->flush();
1172
1173 CodeCache::free(this);
1174 }
1175
1176
1177 //
1178 // Notify all classes this nmethod is dependent on that it is no
1179 // longer dependent. This should only be called in two situations.
1180 // First, when a nmethod transitions to a zombie all dependents need
1181 // to be clear. Since zombification happens at a safepoint there's no
1182 // synchronization issues. The second place is a little more tricky.
1183 // During phase 1 of mark sweep class unloading may happen and as a
1184 // result some nmethods may get unloaded. In this case the flushing
1185 // of dependencies must happen during phase 1 since after GC any
1186 // dependencies in the unloaded nmethod won't be updated, so
1187 // traversing the dependency information in unsafe. In that case this
1188 // function is called with a non-NULL argument and this function only
1189 // notifies instanceKlasses that are reachable
1190
1191 void nmethod::flush_dependencies(BoolObjectClosure* is_alive) {
1192 assert(SafepointSynchronize::is_at_safepoint(), "must be done at safepoint");
1193 assert(Universe::heap()->is_gc_active() == (is_alive != NULL),
1194 "is_alive is non-NULL if and only if we are called during GC");
1195 if (!has_flushed_dependencies()) {
1196 set_has_flushed_dependencies();
1197 for (Dependencies::DepStream deps(this); deps.next(); ) {
1198 klassOop klass = deps.context_type();
1199 if (klass == NULL) continue; // ignore things like evol_method
1200
1201 // During GC the is_alive closure is non-NULL, and is used to
1202 // determine liveness of dependees that need to be updated.
1203 if (is_alive == NULL || is_alive->do_object_b(klass)) {
1204 instanceKlass::cast(klass)->remove_dependent_nmethod(this);
1205 }
1206 }
1207 }
1208 }
1209
1210
1211 // If this oop is not live, the nmethod can be unloaded.
1212 bool nmethod::can_unload(BoolObjectClosure* is_alive,
1213 OopClosure* keep_alive,
1214 oop* root, bool unloading_occurred) {
1215 assert(root != NULL, "just checking");
1216 oop obj = *root;
1217 if (obj == NULL || is_alive->do_object_b(obj)) {
1218 return false;
1219 }
1220 if (obj->is_compiledICHolder()) {
1221 compiledICHolderOop cichk_oop = compiledICHolderOop(obj);
1222 if (is_alive->do_object_b(
1223 cichk_oop->holder_method()->method_holder()) &&
1224 is_alive->do_object_b(cichk_oop->holder_klass())) {
1225 // The oop should be kept alive
1226 keep_alive->do_oop(root);
1227 return false;
1228 }
1229 }
1230 if (!UseParallelOldGC || !VerifyParallelOldWithMarkSweep) {
1231 // Cannot do this test if verification of the UseParallelOldGC
1232 // code using the PSMarkSweep code is being done.
1233 assert(unloading_occurred, "Inconsistency in unloading");
1234 }
1235 make_unloaded(is_alive, obj);
1236 return true;
1237 }
1238
1239 // ------------------------------------------------------------------
1240 // post_compiled_method_load_event
1241 // new method for install_code() path
1242 // Transfer information from compilation to jvmti
1243 void nmethod::post_compiled_method_load_event() {
1244
1245 methodOop moop = method();
1246 HS_DTRACE_PROBE8(hotspot, compiled__method__load,
1247 moop->klass_name()->bytes(),
1248 moop->klass_name()->utf8_length(),
1249 moop->name()->bytes(),
1250 moop->name()->utf8_length(),
1251 moop->signature()->bytes(),
1252 moop->signature()->utf8_length(),
1253 code_begin(), code_size());
1254
1255 if (JvmtiExport::should_post_compiled_method_load()) {
1256 JvmtiExport::post_compiled_method_load(this);
1257 }
1258 }
1259
1260 void nmethod::post_compiled_method_unload() {
1261 assert(_method != NULL && !is_unloaded(), "just checking");
1262 DTRACE_METHOD_UNLOAD_PROBE(method());
1263
1264 // If a JVMTI agent has enabled the CompiledMethodUnload event then
1265 // post the event. Sometime later this nmethod will be made a zombie by
1266 // the sweeper but the methodOop will not be valid at that point.
1267 if (JvmtiExport::should_post_compiled_method_unload()) {
1268 assert(!unload_reported(), "already unloaded");
1269 HandleMark hm;
1270 JvmtiExport::post_compiled_method_unload_at_safepoint(
1271 method()->jmethod_id(), code_begin());
1272 }
1273
1274 // The JVMTI CompiledMethodUnload event can be enabled or disabled at
1275 // any time. As the nmethod is being unloaded now we mark it has
1276 // having the unload event reported - this will ensure that we don't
1277 // attempt to report the event in the unlikely scenario where the
1278 // event is enabled at the time the nmethod is made a zombie.
1279 set_unload_reported();
1280 }
1281
1282 // This is called at the end of the strong tracing/marking phase of a
1283 // GC to unload an nmethod if it contains otherwise unreachable
1284 // oops.
1285
1286 void nmethod::do_unloading(BoolObjectClosure* is_alive,
1287 OopClosure* keep_alive, bool unloading_occurred) {
1288 // Make sure the oop's ready to receive visitors
1289 assert(!is_zombie() && !is_unloaded(),
1290 "should not call follow on zombie or unloaded nmethod");
1291
1292 // If the method is not entrant then a JMP is plastered over the
1293 // first few bytes. If an oop in the old code was there, that oop
1294 // should not get GC'd. Skip the first few bytes of oops on
1295 // not-entrant methods.
1296 address low_boundary = verified_entry_point();
1297 if (is_not_entrant()) {
1298 low_boundary += NativeJump::instruction_size;
1299 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1300 // (See comment above.)
1301 }
1302
1303 // The RedefineClasses() API can cause the class unloading invariant
1304 // to no longer be true. See jvmtiExport.hpp for details.
1305 // Also, leave a debugging breadcrumb in local flag.
1306 bool a_class_was_redefined = JvmtiExport::has_redefined_a_class();
1307 if (a_class_was_redefined) {
1308 // This set of the unloading_occurred flag is done before the
1309 // call to post_compiled_method_unload() so that the unloading
1310 // of this nmethod is reported.
1311 unloading_occurred = true;
1312 }
1313
1314 // Follow methodOop
1315 if (can_unload(is_alive, keep_alive, (oop*)&_method, unloading_occurred)) {
1316 return;
1317 }
1318
1319 // Exception cache
1320 ExceptionCache* ec = exception_cache();
1321 while (ec != NULL) {
1322 oop* ex_addr = (oop*)ec->exception_type_addr();
1323 oop ex = *ex_addr;
1324 ExceptionCache* next_ec = ec->next();
1325 if (ex != NULL && !is_alive->do_object_b(ex)) {
1326 assert(!ex->is_compiledICHolder(), "Possible error here");
1327 remove_from_exception_cache(ec);
1328 }
1329 ec = next_ec;
1330 }
1331
1332 // If class unloading occurred we first iterate over all inline caches and
1333 // clear ICs where the cached oop is referring to an unloaded klass or method.
1334 // The remaining live cached oops will be traversed in the relocInfo::oop_type
1335 // iteration below.
1336 if (unloading_occurred) {
1337 RelocIterator iter(this, low_boundary);
1338 while(iter.next()) {
1339 if (iter.type() == relocInfo::virtual_call_type) {
1340 CompiledIC *ic = CompiledIC_at(iter.reloc());
1341 oop ic_oop = ic->cached_oop();
1342 if (ic_oop != NULL && !is_alive->do_object_b(ic_oop)) {
1343 // The only exception is compiledICHolder oops which may
1344 // yet be marked below. (We check this further below).
1345 if (ic_oop->is_compiledICHolder()) {
1346 compiledICHolderOop cichk_oop = compiledICHolderOop(ic_oop);
1347 if (is_alive->do_object_b(
1348 cichk_oop->holder_method()->method_holder()) &&
1349 is_alive->do_object_b(cichk_oop->holder_klass())) {
1350 continue;
1351 }
1352 }
1353 ic->set_to_clean();
1354 assert(ic->cached_oop() == NULL, "cached oop in IC should be cleared")
1355 }
1356 }
1357 }
1358 }
1359
1360 // Compiled code
1361 RelocIterator iter(this, low_boundary);
1362 while (iter.next()) {
1363 if (iter.type() == relocInfo::oop_type) {
1364 oop_Relocation* r = iter.oop_reloc();
1365 // In this loop, we must only traverse those oops directly embedded in
1366 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1367 assert(1 == (r->oop_is_immediate()) +
1368 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1369 "oop must be found in exactly one place");
1370 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1371 if (can_unload(is_alive, keep_alive, r->oop_addr(), unloading_occurred)) {
1372 return;
1373 }
1374 }
1375 }
1376 }
1377
1378
1379 // Scopes
1380 for (oop* p = oops_begin(); p < oops_end(); p++) {
1381 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1382 if (can_unload(is_alive, keep_alive, p, unloading_occurred)) {
1383 return;
1384 }
1385 }
1386
1387 #ifndef PRODUCT
1388 // This nmethod was not unloaded; check below that all CompiledICs
1389 // refer to marked oops.
1390 {
1391 RelocIterator iter(this, low_boundary);
1392 while (iter.next()) {
1393 if (iter.type() == relocInfo::virtual_call_type) {
1394 CompiledIC *ic = CompiledIC_at(iter.reloc());
1395 oop ic_oop = ic->cached_oop();
1396 assert(ic_oop == NULL || is_alive->do_object_b(ic_oop),
1397 "Found unmarked ic_oop in reachable nmethod");
1398 }
1399 }
1400 }
1401 #endif // !PRODUCT
1402 }
1403
1404 void nmethod::oops_do(OopClosure* f) {
1405 // make sure the oops ready to receive visitors
1406 assert(!is_zombie() && !is_unloaded(),
1407 "should not call follow on zombie or unloaded nmethod");
1408
1409 // If the method is not entrant or zombie then a JMP is plastered over the
1410 // first few bytes. If an oop in the old code was there, that oop
1411 // should not get GC'd. Skip the first few bytes of oops on
1412 // not-entrant methods.
1413 address low_boundary = verified_entry_point();
1414 if (is_not_entrant()) {
1415 low_boundary += NativeJump::instruction_size;
1416 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1417 // (See comment above.)
1418 }
1419
1420 // Compiled code
1421 f->do_oop((oop*) &_method);
1422 ExceptionCache* ec = exception_cache();
1423 while(ec != NULL) {
1424 f->do_oop((oop*)ec->exception_type_addr());
1425 ec = ec->next();
1426 }
1427
1428 RelocIterator iter(this, low_boundary);
1429 while (iter.next()) {
1430 if (iter.type() == relocInfo::oop_type ) {
1431 oop_Relocation* r = iter.oop_reloc();
1432 // In this loop, we must only follow those oops directly embedded in
1433 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1434 assert(1 == (r->oop_is_immediate()) + (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), "oop must be found in exactly one place");
1435 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1436 f->do_oop(r->oop_addr());
1437 }
1438 }
1439 }
1440
1441 // Scopes
1442 for (oop* p = oops_begin(); p < oops_end(); p++) {
1443 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1444 f->do_oop(p);
1445 }
1446 }
1447
1448 // Method that knows how to preserve outgoing arguments at call. This method must be
1449 // called with a frame corresponding to a Java invoke
1450 void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) {
1451 if (!method()->is_native()) {
1452 SimpleScopeDesc ssd(this, fr.pc());
1453 Bytecode_invoke* call = Bytecode_invoke_at(ssd.method(), ssd.bci());
1454 bool is_static = call->is_invokestatic();
1455 symbolOop signature = call->signature();
1456 fr.oops_compiled_arguments_do(signature, is_static, reg_map, f);
1457 }
1458 }
1459
1460
1461 oop nmethod::embeddedOop_at(u_char* p) {
1462 RelocIterator iter(this, p, p + oopSize);
1463 while (iter.next())
1464 if (iter.type() == relocInfo::oop_type) {
1465 return iter.oop_reloc()->oop_value();
1466 }
1467 return NULL;
1468 }
1469
1470
1471 inline bool includes(void* p, void* from, void* to) {
1472 return from <= p && p < to;
1473 }
1474
1475
1476 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
1477 assert(count >= 2, "must be sentinel values, at least");
1478
1479 #ifdef ASSERT
1480 // must be sorted and unique; we do a binary search in find_pc_desc()
1481 int prev_offset = pcs[0].pc_offset();
1482 assert(prev_offset == PcDesc::lower_offset_limit,
1483 "must start with a sentinel");
1484 for (int i = 1; i < count; i++) {
1485 int this_offset = pcs[i].pc_offset();
1486 assert(this_offset > prev_offset, "offsets must be sorted");
1487 prev_offset = this_offset;
1488 }
1489 assert(prev_offset == PcDesc::upper_offset_limit,
1490 "must end with a sentinel");
1491 #endif //ASSERT
1492
1493 int size = count * sizeof(PcDesc);
1494 assert(scopes_pcs_size() >= size, "oob");
1495 memcpy(scopes_pcs_begin(), pcs, size);
1496
1497 // Adjust the final sentinel downward.
1498 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
1499 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
1500 last_pc->set_pc_offset(instructions_size() + 1);
1501 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
1502 // Fill any rounding gaps with copies of the last record.
1503 last_pc[1] = last_pc[0];
1504 }
1505 // The following assert could fail if sizeof(PcDesc) is not
1506 // an integral multiple of oopSize (the rounding term).
1507 // If it fails, change the logic to always allocate a multiple
1508 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
1509 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
1510 }
1511
1512 void nmethod::copy_scopes_data(u_char* buffer, int size) {
1513 assert(scopes_data_size() >= size, "oob");
1514 memcpy(scopes_data_begin(), buffer, size);
1515 }
1516
1517
1518 #ifdef ASSERT
1519 static PcDesc* linear_search(nmethod* nm, int pc_offset, bool approximate) {
1520 PcDesc* lower = nm->scopes_pcs_begin();
1521 PcDesc* upper = nm->scopes_pcs_end();
1522 lower += 1; // exclude initial sentinel
1523 PcDesc* res = NULL;
1524 for (PcDesc* p = lower; p < upper; p++) {
1525 NOT_PRODUCT(--nmethod_stats.pc_desc_tests); // don't count this call to match_desc
1526 if (match_desc(p, pc_offset, approximate)) {
1527 if (res == NULL)
1528 res = p;
1529 else
1530 res = (PcDesc*) badAddress;
1531 }
1532 }
1533 return res;
1534 }
1535 #endif
1536
1537
1538 // Finds a PcDesc with real-pc equal to "pc"
1539 PcDesc* nmethod::find_pc_desc_internal(address pc, bool approximate) {
1540 address base_address = instructions_begin();
1541 if ((pc < base_address) ||
1542 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
1543 return NULL; // PC is wildly out of range
1544 }
1545 int pc_offset = (int) (pc - base_address);
1546
1547 // Check the PcDesc cache if it contains the desired PcDesc
1548 // (This as an almost 100% hit rate.)
1549 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
1550 if (res != NULL) {
1551 assert(res == linear_search(this, pc_offset, approximate), "cache ok");
1552 return res;
1553 }
1554
1555 // Fallback algorithm: quasi-linear search for the PcDesc
1556 // Find the last pc_offset less than the given offset.
1557 // The successor must be the required match, if there is a match at all.
1558 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
1559 PcDesc* lower = scopes_pcs_begin();
1560 PcDesc* upper = scopes_pcs_end();
1561 upper -= 1; // exclude final sentinel
1562 if (lower >= upper) return NULL; // native method; no PcDescs at all
1563
1564 #define assert_LU_OK \
1565 /* invariant on lower..upper during the following search: */ \
1566 assert(lower->pc_offset() < pc_offset, "sanity"); \
1567 assert(upper->pc_offset() >= pc_offset, "sanity")
1568 assert_LU_OK;
1569
1570 // Use the last successful return as a split point.
1571 PcDesc* mid = _pc_desc_cache.last_pc_desc();
1572 NOT_PRODUCT(++nmethod_stats.pc_desc_searches);
1573 if (mid->pc_offset() < pc_offset) {
1574 lower = mid;
1575 } else {
1576 upper = mid;
1577 }
1578
1579 // Take giant steps at first (4096, then 256, then 16, then 1)
1580 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
1581 const int RADIX = (1 << LOG2_RADIX);
1582 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
1583 while ((mid = lower + step) < upper) {
1584 assert_LU_OK;
1585 NOT_PRODUCT(++nmethod_stats.pc_desc_searches);
1586 if (mid->pc_offset() < pc_offset) {
1587 lower = mid;
1588 } else {
1589 upper = mid;
1590 break;
1591 }
1592 }
1593 assert_LU_OK;
1594 }
1595
1596 // Sneak up on the value with a linear search of length ~16.
1597 while (true) {
1598 assert_LU_OK;
1599 mid = lower + 1;
1600 NOT_PRODUCT(++nmethod_stats.pc_desc_searches);
1601 if (mid->pc_offset() < pc_offset) {
1602 lower = mid;
1603 } else {
1604 upper = mid;
1605 break;
1606 }
1607 }
1608 #undef assert_LU_OK
1609
1610 if (match_desc(upper, pc_offset, approximate)) {
1611 assert(upper == linear_search(this, pc_offset, approximate), "search ok");
1612 _pc_desc_cache.add_pc_desc(upper);
1613 return upper;
1614 } else {
1615 assert(NULL == linear_search(this, pc_offset, approximate), "search ok");
1616 return NULL;
1617 }
1618 }
1619
1620
1621 bool nmethod::check_all_dependencies() {
1622 bool found_check = false;
1623 // wholesale check of all dependencies
1624 for (Dependencies::DepStream deps(this); deps.next(); ) {
1625 if (deps.check_dependency() != NULL) {
1626 found_check = true;
1627 NOT_DEBUG(break);
1628 }
1629 }
1630 return found_check; // tell caller if we found anything
1631 }
1632
1633 bool nmethod::check_dependency_on(DepChange& changes) {
1634 // What has happened:
1635 // 1) a new class dependee has been added
1636 // 2) dependee and all its super classes have been marked
1637 bool found_check = false; // set true if we are upset
1638 for (Dependencies::DepStream deps(this); deps.next(); ) {
1639 // Evaluate only relevant dependencies.
1640 if (deps.spot_check_dependency_at(changes) != NULL) {
1641 found_check = true;
1642 NOT_DEBUG(break);
1643 }
1644 }
1645 return found_check;
1646 }
1647
1648 bool nmethod::is_evol_dependent_on(klassOop dependee) {
1649 instanceKlass *dependee_ik = instanceKlass::cast(dependee);
1650 objArrayOop dependee_methods = dependee_ik->methods();
1651 for (Dependencies::DepStream deps(this); deps.next(); ) {
1652 if (deps.type() == Dependencies::evol_method) {
1653 methodOop method = deps.method_argument(0);
1654 for (int j = 0; j < dependee_methods->length(); j++) {
1655 if ((methodOop) dependee_methods->obj_at(j) == method) {
1656 // RC_TRACE macro has an embedded ResourceMark
1657 RC_TRACE(0x01000000,
1658 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)",
1659 _method->method_holder()->klass_part()->external_name(),
1660 _method->name()->as_C_string(),
1661 _method->signature()->as_C_string(), compile_id(),
1662 method->method_holder()->klass_part()->external_name(),
1663 method->name()->as_C_string(),
1664 method->signature()->as_C_string()));
1665 if (TraceDependencies || LogCompilation)
1666 deps.log_dependency(dependee);
1667 return true;
1668 }
1669 }
1670 }
1671 }
1672 return false;
1673 }
1674
1675 // Called from mark_for_deoptimization, when dependee is invalidated.
1676 bool nmethod::is_dependent_on_method(methodOop dependee) {
1677 for (Dependencies::DepStream deps(this); deps.next(); ) {
1678 if (deps.type() != Dependencies::evol_method)
1679 continue;
1680 methodOop method = deps.method_argument(0);
1681 if (method == dependee) return true;
1682 }
1683 return false;
1684 }
1685
1686
1687 bool nmethod::is_patchable_at(address instr_addr) {
1688 assert (code_contains(instr_addr), "wrong nmethod used");
1689 if (is_zombie()) {
1690 // a zombie may never be patched
1691 return false;
1692 }
1693 return true;
1694 }
1695
1696
1697 address nmethod::continuation_for_implicit_exception(address pc) {
1698 // Exception happened outside inline-cache check code => we are inside
1699 // an active nmethod => use cpc to determine a return address
1700 int exception_offset = pc - instructions_begin();
1701 int cont_offset = ImplicitExceptionTable(this).at( exception_offset );
1702 #ifdef ASSERT
1703 if (cont_offset == 0) {
1704 Thread* thread = ThreadLocalStorage::get_thread_slow();
1705 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
1706 HandleMark hm(thread);
1707 ResourceMark rm(thread);
1708 CodeBlob* cb = CodeCache::find_blob(pc);
1709 assert(cb != NULL && cb == this, "");
1710 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, pc);
1711 print();
1712 method()->print_codes();
1713 print_code();
1714 print_pcs();
1715 }
1716 #endif
1717 guarantee(cont_offset != 0, "unhandled implicit exception in compiled code");
1718 return instructions_begin() + cont_offset;
1719 }
1720
1721
1722
1723 void nmethod_init() {
1724 // make sure you didn't forget to adjust the filler fields
1725 assert(sizeof(nmFlags) <= 4, "nmFlags occupies more than a word");
1726 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
1727 }
1728
1729
1730 //-------------------------------------------------------------------------------------------
1731
1732
1733 // QQQ might we make this work from a frame??
1734 nmethodLocker::nmethodLocker(address pc) {
1735 CodeBlob* cb = CodeCache::find_blob(pc);
1736 guarantee(cb != NULL && cb->is_nmethod(), "bad pc for a nmethod found");
1737 _nm = (nmethod*)cb;
1738 lock_nmethod(_nm);
1739 }
1740
1741 void nmethodLocker::lock_nmethod(nmethod* nm) {
1742 if (nm == NULL) return;
1743 Atomic::inc(&nm->_lock_count);
1744 guarantee(!nm->is_zombie(), "cannot lock a zombie method");
1745 }
1746
1747 void nmethodLocker::unlock_nmethod(nmethod* nm) {
1748 if (nm == NULL) return;
1749 Atomic::dec(&nm->_lock_count);
1750 guarantee(nm->_lock_count >= 0, "unmatched nmethod lock/unlock");
1751 }
1752
1753 bool nmethod::is_deopt_pc(address pc) {
1754 bool ret = pc == deopt_handler_begin();
1755 return ret;
1756 }
1757
1758
1759 // -----------------------------------------------------------------------------
1760 // Verification
1761
1762 void nmethod::verify() {
1763
1764 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant
1765 // seems odd.
1766
1767 if( is_zombie() || is_not_entrant() )
1768 return;
1769
1770 // Make sure all the entry points are correctly aligned for patching.
1771 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
1772
1773 assert(method()->is_oop(), "must be valid");
1774
1775 ResourceMark rm;
1776
1777 if (!CodeCache::contains(this)) {
1778 fatal1("nmethod at " INTPTR_FORMAT " not in zone", this);
1779 }
1780
1781 if(is_native_method() )
1782 return;
1783
1784 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
1785 if (nm != this) {
1786 fatal1("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", this);
1787 }
1788
1789 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
1790 if (! p->verify(this)) {
1791 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", this);
1792 }
1793 }
1794
1795 verify_scopes();
1796 }
1797
1798
1799 void nmethod::verify_interrupt_point(address call_site) {
1800 // This code does not work in release mode since
1801 // owns_lock only is available in debug mode.
1802 CompiledIC* ic = NULL;
1803 Thread *cur = Thread::current();
1804 if (CompiledIC_lock->owner() == cur ||
1805 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) &&
1806 SafepointSynchronize::is_at_safepoint())) {
1807 ic = CompiledIC_at(call_site);
1808 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
1809 } else {
1810 MutexLocker ml_verify (CompiledIC_lock);
1811 ic = CompiledIC_at(call_site);
1812 }
1813 PcDesc* pd = pc_desc_at(ic->end_of_call());
1814 assert(pd != NULL, "PcDesc must exist");
1815 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(),
1816 pd->obj_decode_offset());
1817 !sd->is_top(); sd = sd->sender()) {
1818 sd->verify();
1819 }
1820 }
1821
1822 void nmethod::verify_scopes() {
1823 if( !method() ) return; // Runtime stubs have no scope
1824 if (method()->is_native()) return; // Ignore stub methods.
1825 // iterate through all interrupt point
1826 // and verify the debug information is valid.
1827 RelocIterator iter((nmethod*)this);
1828 while (iter.next()) {
1829 address stub = NULL;
1830 switch (iter.type()) {
1831 case relocInfo::virtual_call_type:
1832 verify_interrupt_point(iter.addr());
1833 break;
1834 case relocInfo::opt_virtual_call_type:
1835 stub = iter.opt_virtual_call_reloc()->static_stub();
1836 verify_interrupt_point(iter.addr());
1837 break;
1838 case relocInfo::static_call_type:
1839 stub = iter.static_call_reloc()->static_stub();
1840 //verify_interrupt_point(iter.addr());
1841 break;
1842 case relocInfo::runtime_call_type:
1843 address destination = iter.reloc()->value();
1844 // Right now there is no way to find out which entries support
1845 // an interrupt point. It would be nice if we had this
1846 // information in a table.
1847 break;
1848 }
1849 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section");
1850 }
1851 }
1852
1853
1854 // -----------------------------------------------------------------------------
1855 // Non-product code
1856 #ifndef PRODUCT
1857
1858 void nmethod::check_store() {
1859 // Make sure all oops in the compiled code are tenured
1860
1861 RelocIterator iter(this);
1862 while (iter.next()) {
1863 if (iter.type() == relocInfo::oop_type) {
1864 oop_Relocation* reloc = iter.oop_reloc();
1865 oop obj = reloc->oop_value();
1866 if (obj != NULL && !obj->is_perm()) {
1867 fatal("must be permanent oop in compiled code");
1868 }
1869 }
1870 }
1871 }
1872
1873
1874 // Printing operations
1875
1876 void nmethod::print() const {
1877 ResourceMark rm;
1878 ttyLocker ttyl; // keep the following output all in one block
1879
1880 tty->print("Compiled ");
1881
1882 if (is_compiled_by_c1()) {
1883 tty->print("(c1) ");
1884 } else if (is_compiled_by_c2()) {
1885 tty->print("(c2) ");
1886 } else {
1887 assert(is_native_method(), "Who else?");
1888 tty->print("(nm) ");
1889 }
1890
1891 print_on(tty, "nmethod");
1892 tty->cr();
1893 if (WizardMode) {
1894 tty->print("((nmethod*) "INTPTR_FORMAT ") ", this);
1895 tty->print(" for method " INTPTR_FORMAT , (address)method());
1896 tty->print(" { ");
1897 if (version()) tty->print("v%d ", version());
1898 if (level()) tty->print("l%d ", level());
1899 if (is_in_use()) tty->print("in_use ");
1900 if (is_not_entrant()) tty->print("not_entrant ");
1901 if (is_zombie()) tty->print("zombie ");
1902 if (is_unloaded()) tty->print("unloaded ");
1903 tty->print_cr("}:");
1904 }
1905 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
1906 (address)this,
1907 (address)this + size(),
1908 size());
1909 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
1910 relocation_begin(),
1911 relocation_end(),
1912 relocation_size());
1913 if (code_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
1914 code_begin(),
1915 code_end(),
1916 code_size());
1917 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
1918 stub_begin(),
1919 stub_end(),
1920 stub_size());
1921 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
1922 consts_begin(),
1923 consts_end(),
1924 consts_size());
1925 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
1926 scopes_data_begin(),
1927 scopes_data_end(),
1928 scopes_data_size());
1929 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
1930 scopes_pcs_begin(),
1931 scopes_pcs_end(),
1932 scopes_pcs_size());
1933 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
1934 dependencies_begin(),
1935 dependencies_end(),
1936 dependencies_size());
1937 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
1938 handler_table_begin(),
1939 handler_table_end(),
1940 handler_table_size());
1941 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
1942 nul_chk_table_begin(),
1943 nul_chk_table_end(),
1944 nul_chk_table_size());
1945 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
1946 oops_begin(),
1947 oops_end(),
1948 oops_size());
1949 }
1950
1951
1952 void nmethod::print_scopes() {
1953 // Find the first pc desc for all scopes in the code and print it.
1954 ResourceMark rm;
1955 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
1956 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
1957 continue;
1958
1959 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
1960 sd->print_on(tty, p);
1961 }
1962 }
1963
1964 void nmethod::print_dependencies() {
1965 ResourceMark rm;
1966 ttyLocker ttyl; // keep the following output all in one block
1967 tty->print_cr("Dependencies:");
1968 for (Dependencies::DepStream deps(this); deps.next(); ) {
1969 deps.print_dependency();
1970 klassOop ctxk = deps.context_type();
1971 if (ctxk != NULL) {
1972 Klass* k = Klass::cast(ctxk);
1973 if (k->oop_is_instance() && ((instanceKlass*)k)->is_dependent_nmethod(this)) {
1974 tty->print_cr(" [nmethod<=klass]%s", k->external_name());
1975 }
1976 }
1977 deps.log_dependency(); // put it into the xml log also
1978 }
1979 }
1980
1981
1982 void nmethod::print_code() {
1983 HandleMark hm;
1984 ResourceMark m;
1985 Disassembler().decode(this);
1986 }
1987
1988
1989 void nmethod::print_relocations() {
1990 ResourceMark m; // in case methods get printed via the debugger
1991 tty->print_cr("relocations:");
1992 RelocIterator iter(this);
1993 iter.print();
1994 if (UseRelocIndex) {
1995 jint* index_end = (jint*)relocation_end() - 1;
1996 jint index_size = *index_end;
1997 jint* index_start = (jint*)( (address)index_end - index_size );
1998 tty->print_cr(" index @" INTPTR_FORMAT ": index_size=%d", index_start, index_size);
1999 if (index_size > 0) {
2000 jint* ip;
2001 for (ip = index_start; ip+2 <= index_end; ip += 2)
2002 tty->print_cr(" (%d %d) addr=" INTPTR_FORMAT " @" INTPTR_FORMAT,
2003 ip[0],
2004 ip[1],
2005 header_end()+ip[0],
2006 relocation_begin()-1+ip[1]);
2007 for (; ip < index_end; ip++)
2008 tty->print_cr(" (%d ?)", ip[0]);
2009 tty->print_cr(" @" INTPTR_FORMAT ": index_size=%d", ip, *ip++);
2010 tty->print_cr("reloc_end @" INTPTR_FORMAT ":", ip);
2011 }
2012 }
2013 }
2014
2015
2016 void nmethod::print_pcs() {
2017 ResourceMark m; // in case methods get printed via debugger
2018 tty->print_cr("pc-bytecode offsets:");
2019 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2020 p->print(this);
2021 }
2022 }
2023
2024
2025 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
2026 RelocIterator iter(this, begin, end);
2027 bool have_one = false;
2028 while (iter.next()) {
2029 have_one = true;
2030 switch (iter.type()) {
2031 case relocInfo::none: return "no_reloc";
2032 case relocInfo::oop_type: {
2033 stringStream st;
2034 oop_Relocation* r = iter.oop_reloc();
2035 oop obj = r->oop_value();
2036 st.print("oop(");
2037 if (obj == NULL) st.print("NULL");
2038 else obj->print_value_on(&st);
2039 st.print(")");
2040 return st.as_string();
2041 }
2042 case relocInfo::virtual_call_type: return "virtual_call";
2043 case relocInfo::opt_virtual_call_type: return "optimized virtual_call";
2044 case relocInfo::static_call_type: return "static_call";
2045 case relocInfo::static_stub_type: return "static_stub";
2046 case relocInfo::runtime_call_type: return "runtime_call";
2047 case relocInfo::external_word_type: return "external_word";
2048 case relocInfo::internal_word_type: return "internal_word";
2049 case relocInfo::section_word_type: return "section_word";
2050 case relocInfo::poll_type: return "poll";
2051 case relocInfo::poll_return_type: return "poll_return";
2052 case relocInfo::type_mask: return "type_bit_mask";
2053 }
2054 }
2055 return have_one ? "other" : NULL;
2056 }
2057
2058
2059 // Return a the last scope in (begin..end]
2060 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
2061 PcDesc* p = pc_desc_near(begin+1);
2062 if (p != NULL && p->real_pc(this) <= end) {
2063 return new ScopeDesc(this, p->scope_decode_offset(),
2064 p->obj_decode_offset());
2065 }
2066 return NULL;
2067 }
2068
2069 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) {
2070 // First, find an oopmap in (begin, end].
2071 // We use the odd half-closed interval so that oop maps and scope descs
2072 // which are tied to the byte after a call are printed with the call itself.
2073 address base = instructions_begin();
2074 OopMapSet* oms = oop_maps();
2075 if (oms != NULL) {
2076 for (int i = 0, imax = oms->size(); i < imax; i++) {
2077 OopMap* om = oms->at(i);
2078 address pc = base + om->offset();
2079 if (pc > begin) {
2080 if (pc <= end) {
2081 st->fill_to(column);
2082 if (st == tty) {
2083 st->print("; OopMap ");
2084 om->print();
2085 tty->cr();
2086 } else {
2087 st->print_cr("; OopMap #%d offset:%d", i, om->offset());
2088 }
2089 }
2090 break;
2091 }
2092 }
2093 }
2094 ScopeDesc* sd = scope_desc_in(begin, end);
2095 if (sd != NULL) {
2096 st->fill_to(column);
2097 if (sd->bci() == SynchronizationEntryBCI) {
2098 st->print(";*synchronization entry");
2099 } else {
2100 if (sd->method().is_null()) {
2101 tty->print("method is NULL");
2102 } else if (sd->method()->is_native()) {
2103 tty->print("method is native");
2104 } else {
2105 address bcp = sd->method()->bcp_from(sd->bci());
2106 Bytecodes::Code bc = Bytecodes::java_code_at(bcp);
2107 st->print(";*%s", Bytecodes::name(bc));
2108 switch (bc) {
2109 case Bytecodes::_invokevirtual:
2110 case Bytecodes::_invokespecial:
2111 case Bytecodes::_invokestatic:
2112 case Bytecodes::_invokeinterface:
2113 {
2114 Bytecode_invoke* invoke = Bytecode_invoke_at(sd->method(), sd->bci());
2115 st->print(" ");
2116 if (invoke->name() != NULL)
2117 invoke->name()->print_symbol_on(st);
2118 else
2119 st->print("<UNKNOWN>");
2120 break;
2121 }
2122 case Bytecodes::_getfield:
2123 case Bytecodes::_putfield:
2124 case Bytecodes::_getstatic:
2125 case Bytecodes::_putstatic:
2126 {
2127 methodHandle sdm = sd->method();
2128 Bytecode_field* field = Bytecode_field_at(sdm(), sdm->bcp_from(sd->bci()));
2129 constantPoolOop sdmc = sdm->constants();
2130 symbolOop name = sdmc->name_ref_at(field->index());
2131 st->print(" ");
2132 if (name != NULL)
2133 name->print_symbol_on(st);
2134 else
2135 st->print("<UNKNOWN>");
2136 }
2137 }
2138 }
2139 }
2140 st->cr();
2141 // Print all scopes
2142 for (;sd != NULL; sd = sd->sender()) {
2143 st->fill_to(column);
2144 st->print("; -");
2145 if (sd->method().is_null()) {
2146 tty->print("method is NULL");
2147 } else {
2148 sd->method()->print_short_name(st);
2149 }
2150 int lineno = sd->method()->line_number_from_bci(sd->bci());
2151 if (lineno != -1) {
2152 st->print("@%d (line %d)", sd->bci(), lineno);
2153 } else {
2154 st->print("@%d", sd->bci());
2155 }
2156 st->cr();
2157 }
2158 }
2159
2160 // Print relocation information
2161 const char* str = reloc_string_for(begin, end);
2162 if (str != NULL) {
2163 if (sd != NULL) st->cr();
2164 st->fill_to(column);
2165 st->print("; {%s}", str);
2166 }
2167 int cont_offset = ImplicitExceptionTable(this).at(begin - instructions_begin());
2168 if (cont_offset != 0) {
2169 st->fill_to(column);
2170 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, instructions_begin() + cont_offset);
2171 }
2172
2173 }
2174
2175 void nmethod::print_value_on(outputStream* st) const {
2176 print_on(st, "nmethod");
2177 }
2178
2179 void nmethod::print_calls(outputStream* st) {
2180 RelocIterator iter(this);
2181 while (iter.next()) {
2182 switch (iter.type()) {
2183 case relocInfo::virtual_call_type:
2184 case relocInfo::opt_virtual_call_type: {
2185 VerifyMutexLocker mc(CompiledIC_lock);
2186 CompiledIC_at(iter.reloc())->print();
2187 break;
2188 }
2189 case relocInfo::static_call_type:
2190 st->print_cr("Static call at " INTPTR_FORMAT, iter.reloc()->addr());
2191 compiledStaticCall_at(iter.reloc())->print();
2192 break;
2193 }
2194 }
2195 }
2196
2197 void nmethod::print_handler_table() {
2198 ExceptionHandlerTable(this).print();
2199 }
2200
2201 void nmethod::print_nul_chk_table() {
2202 ImplicitExceptionTable(this).print(instructions_begin());
2203 }
2204
2205 void nmethod::print_statistics() {
2206 ttyLocker ttyl;
2207 if (xtty != NULL) xtty->head("statistics type='nmethod'");
2208 nmethod_stats.print_native_nmethod_stats();
2209 nmethod_stats.print_nmethod_stats();
2210 DebugInformationRecorder::print_statistics();
2211 nmethod_stats.print_pc_stats();
2212 Dependencies::print_statistics();
2213 if (xtty != NULL) xtty->tail("statistics");
2214 }
2215
2216 #endif // PRODUCT