Fri, 29 Jan 2010 09:27:22 -0800
4360113: Evict nmethods when code cache gets full
Summary: Speculatively unload the oldest nmethods when code cache gets full.
Reviewed-by: never, kvn
Contributed-by: eric.caspole@amd.com
1 /*
2 * Copyright 1997-2009 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 */
25 # include "incls/_precompiled.incl"
26 # include "incls/_nmethod.cpp.incl"
28 #ifdef DTRACE_ENABLED
30 // Only bother with this argument setup if dtrace is available
32 HS_DTRACE_PROBE_DECL8(hotspot, compiled__method__load,
33 const char*, int, const char*, int, const char*, int, void*, size_t);
35 HS_DTRACE_PROBE_DECL6(hotspot, compiled__method__unload,
36 char*, int, char*, int, char*, int);
38 #define DTRACE_METHOD_UNLOAD_PROBE(method) \
39 { \
40 methodOop m = (method); \
41 if (m != NULL) { \
42 symbolOop klass_name = m->klass_name(); \
43 symbolOop name = m->name(); \
44 symbolOop signature = m->signature(); \
45 HS_DTRACE_PROBE6(hotspot, compiled__method__unload, \
46 klass_name->bytes(), klass_name->utf8_length(), \
47 name->bytes(), name->utf8_length(), \
48 signature->bytes(), signature->utf8_length()); \
49 } \
50 }
52 #else // ndef DTRACE_ENABLED
54 #define DTRACE_METHOD_UNLOAD_PROBE(method)
56 #endif
58 bool nmethod::is_compiled_by_c1() const {
59 if (compiler() == NULL || method() == NULL) return false; // can happen during debug printing
60 if (is_native_method()) return false;
61 return compiler()->is_c1();
62 }
63 bool nmethod::is_compiled_by_c2() const {
64 if (compiler() == NULL || method() == NULL) return false; // can happen during debug printing
65 if (is_native_method()) return false;
66 return compiler()->is_c2();
67 }
71 //---------------------------------------------------------------------------------
72 // NMethod statistics
73 // They are printed under various flags, including:
74 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation.
75 // (In the latter two cases, they like other stats are printed to the log only.)
77 #ifndef PRODUCT
78 // These variables are put into one block to reduce relocations
79 // and make it simpler to print from the debugger.
80 static
81 struct nmethod_stats_struct {
82 int nmethod_count;
83 int total_size;
84 int relocation_size;
85 int code_size;
86 int stub_size;
87 int consts_size;
88 int scopes_data_size;
89 int scopes_pcs_size;
90 int dependencies_size;
91 int handler_table_size;
92 int nul_chk_table_size;
93 int oops_size;
95 void note_nmethod(nmethod* nm) {
96 nmethod_count += 1;
97 total_size += nm->size();
98 relocation_size += nm->relocation_size();
99 code_size += nm->code_size();
100 stub_size += nm->stub_size();
101 consts_size += nm->consts_size();
102 scopes_data_size += nm->scopes_data_size();
103 scopes_pcs_size += nm->scopes_pcs_size();
104 dependencies_size += nm->dependencies_size();
105 handler_table_size += nm->handler_table_size();
106 nul_chk_table_size += nm->nul_chk_table_size();
107 oops_size += nm->oops_size();
108 }
109 void print_nmethod_stats() {
110 if (nmethod_count == 0) return;
111 tty->print_cr("Statistics for %d bytecoded nmethods:", nmethod_count);
112 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size);
113 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size);
114 if (code_size != 0) tty->print_cr(" main code = %d", code_size);
115 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size);
116 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size);
117 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size);
118 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size);
119 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size);
120 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size);
121 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size);
122 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size);
123 }
125 int native_nmethod_count;
126 int native_total_size;
127 int native_relocation_size;
128 int native_code_size;
129 int native_oops_size;
130 void note_native_nmethod(nmethod* nm) {
131 native_nmethod_count += 1;
132 native_total_size += nm->size();
133 native_relocation_size += nm->relocation_size();
134 native_code_size += nm->code_size();
135 native_oops_size += nm->oops_size();
136 }
137 void print_native_nmethod_stats() {
138 if (native_nmethod_count == 0) return;
139 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count);
140 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size);
141 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size);
142 if (native_code_size != 0) tty->print_cr(" N. main code = %d", native_code_size);
143 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size);
144 }
146 int pc_desc_resets; // number of resets (= number of caches)
147 int pc_desc_queries; // queries to nmethod::find_pc_desc
148 int pc_desc_approx; // number of those which have approximate true
149 int pc_desc_repeats; // number of _last_pc_desc hits
150 int pc_desc_hits; // number of LRU cache hits
151 int pc_desc_tests; // total number of PcDesc examinations
152 int pc_desc_searches; // total number of quasi-binary search steps
153 int pc_desc_adds; // number of LUR cache insertions
155 void print_pc_stats() {
156 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query",
157 pc_desc_queries,
158 (double)(pc_desc_tests + pc_desc_searches)
159 / pc_desc_queries);
160 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d",
161 pc_desc_resets,
162 pc_desc_queries, pc_desc_approx,
163 pc_desc_repeats, pc_desc_hits,
164 pc_desc_tests, pc_desc_searches, pc_desc_adds);
165 }
166 } nmethod_stats;
167 #endif //PRODUCT
169 //---------------------------------------------------------------------------------
172 // The _unwind_handler is a special marker address, which says that
173 // for given exception oop and address, the frame should be removed
174 // as the tuple cannot be caught in the nmethod
175 address ExceptionCache::_unwind_handler = (address) -1;
178 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) {
179 assert(pc != NULL, "Must be non null");
180 assert(exception.not_null(), "Must be non null");
181 assert(handler != NULL, "Must be non null");
183 _count = 0;
184 _exception_type = exception->klass();
185 _next = NULL;
187 add_address_and_handler(pc,handler);
188 }
191 address ExceptionCache::match(Handle exception, address pc) {
192 assert(pc != NULL,"Must be non null");
193 assert(exception.not_null(),"Must be non null");
194 if (exception->klass() == exception_type()) {
195 return (test_address(pc));
196 }
198 return NULL;
199 }
202 bool ExceptionCache::match_exception_with_space(Handle exception) {
203 assert(exception.not_null(),"Must be non null");
204 if (exception->klass() == exception_type() && count() < cache_size) {
205 return true;
206 }
207 return false;
208 }
211 address ExceptionCache::test_address(address addr) {
212 for (int i=0; i<count(); i++) {
213 if (pc_at(i) == addr) {
214 return handler_at(i);
215 }
216 }
217 return NULL;
218 }
221 bool ExceptionCache::add_address_and_handler(address addr, address handler) {
222 if (test_address(addr) == handler) return true;
223 if (count() < cache_size) {
224 set_pc_at(count(),addr);
225 set_handler_at(count(), handler);
226 increment_count();
227 return true;
228 }
229 return false;
230 }
233 // private method for handling exception cache
234 // These methods are private, and used to manipulate the exception cache
235 // directly.
236 ExceptionCache* nmethod::exception_cache_entry_for_exception(Handle exception) {
237 ExceptionCache* ec = exception_cache();
238 while (ec != NULL) {
239 if (ec->match_exception_with_space(exception)) {
240 return ec;
241 }
242 ec = ec->next();
243 }
244 return NULL;
245 }
248 //-----------------------------------------------------------------------------
251 // Helper used by both find_pc_desc methods.
252 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) {
253 NOT_PRODUCT(++nmethod_stats.pc_desc_tests);
254 if (!approximate)
255 return pc->pc_offset() == pc_offset;
256 else
257 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset();
258 }
260 void PcDescCache::reset_to(PcDesc* initial_pc_desc) {
261 if (initial_pc_desc == NULL) {
262 _last_pc_desc = NULL; // native method
263 return;
264 }
265 NOT_PRODUCT(++nmethod_stats.pc_desc_resets);
266 // reset the cache by filling it with benign (non-null) values
267 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel");
268 _last_pc_desc = initial_pc_desc + 1; // first valid one is after sentinel
269 for (int i = 0; i < cache_size; i++)
270 _pc_descs[i] = initial_pc_desc;
271 }
273 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) {
274 NOT_PRODUCT(++nmethod_stats.pc_desc_queries);
275 NOT_PRODUCT(if (approximate) ++nmethod_stats.pc_desc_approx);
277 // In order to prevent race conditions do not load cache elements
278 // repeatedly, but use a local copy:
279 PcDesc* res;
281 // Step one: Check the most recently returned value.
282 res = _last_pc_desc;
283 if (res == NULL) return NULL; // native method; no PcDescs at all
284 if (match_desc(res, pc_offset, approximate)) {
285 NOT_PRODUCT(++nmethod_stats.pc_desc_repeats);
286 return res;
287 }
289 // Step two: Check the LRU cache.
290 for (int i = 0; i < cache_size; i++) {
291 res = _pc_descs[i];
292 if (res->pc_offset() < 0) break; // optimization: skip empty cache
293 if (match_desc(res, pc_offset, approximate)) {
294 NOT_PRODUCT(++nmethod_stats.pc_desc_hits);
295 _last_pc_desc = res; // record this cache hit in case of repeat
296 return res;
297 }
298 }
300 // Report failure.
301 return NULL;
302 }
304 void PcDescCache::add_pc_desc(PcDesc* pc_desc) {
305 NOT_PRODUCT(++nmethod_stats.pc_desc_adds);
306 // Update the LRU cache by shifting pc_desc forward:
307 for (int i = 0; i < cache_size; i++) {
308 PcDesc* next = _pc_descs[i];
309 _pc_descs[i] = pc_desc;
310 pc_desc = next;
311 }
312 // Note: Do not update _last_pc_desc. It fronts for the LRU cache.
313 }
315 // adjust pcs_size so that it is a multiple of both oopSize and
316 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple
317 // of oopSize, then 2*sizeof(PcDesc) is)
318 static int adjust_pcs_size(int pcs_size) {
319 int nsize = round_to(pcs_size, oopSize);
320 if ((nsize % sizeof(PcDesc)) != 0) {
321 nsize = pcs_size + sizeof(PcDesc);
322 }
323 assert((nsize % oopSize) == 0, "correct alignment");
324 return nsize;
325 }
327 //-----------------------------------------------------------------------------
330 void nmethod::add_exception_cache_entry(ExceptionCache* new_entry) {
331 assert(ExceptionCache_lock->owned_by_self(),"Must hold the ExceptionCache_lock");
332 assert(new_entry != NULL,"Must be non null");
333 assert(new_entry->next() == NULL, "Must be null");
335 if (exception_cache() != NULL) {
336 new_entry->set_next(exception_cache());
337 }
338 set_exception_cache(new_entry);
339 }
341 void nmethod::remove_from_exception_cache(ExceptionCache* ec) {
342 ExceptionCache* prev = NULL;
343 ExceptionCache* curr = exception_cache();
344 assert(curr != NULL, "nothing to remove");
345 // find the previous and next entry of ec
346 while (curr != ec) {
347 prev = curr;
348 curr = curr->next();
349 assert(curr != NULL, "ExceptionCache not found");
350 }
351 // now: curr == ec
352 ExceptionCache* next = curr->next();
353 if (prev == NULL) {
354 set_exception_cache(next);
355 } else {
356 prev->set_next(next);
357 }
358 delete curr;
359 }
362 // public method for accessing the exception cache
363 // These are the public access methods.
364 address nmethod::handler_for_exception_and_pc(Handle exception, address pc) {
365 // We never grab a lock to read the exception cache, so we may
366 // have false negatives. This is okay, as it can only happen during
367 // the first few exception lookups for a given nmethod.
368 ExceptionCache* ec = exception_cache();
369 while (ec != NULL) {
370 address ret_val;
371 if ((ret_val = ec->match(exception,pc)) != NULL) {
372 return ret_val;
373 }
374 ec = ec->next();
375 }
376 return NULL;
377 }
380 void nmethod::add_handler_for_exception_and_pc(Handle exception, address pc, address handler) {
381 // There are potential race conditions during exception cache updates, so we
382 // must own the ExceptionCache_lock before doing ANY modifications. Because
383 // we don't lock during reads, it is possible to have several threads attempt
384 // to update the cache with the same data. We need to check for already inserted
385 // copies of the current data before adding it.
387 MutexLocker ml(ExceptionCache_lock);
388 ExceptionCache* target_entry = exception_cache_entry_for_exception(exception);
390 if (target_entry == NULL || !target_entry->add_address_and_handler(pc,handler)) {
391 target_entry = new ExceptionCache(exception,pc,handler);
392 add_exception_cache_entry(target_entry);
393 }
394 }
397 //-------------end of code for ExceptionCache--------------
400 void nmFlags::clear() {
401 assert(sizeof(nmFlags) == sizeof(int), "using more than one word for nmFlags");
402 *(jint*)this = 0;
403 }
405 int nmethod::total_size() const {
406 return
407 code_size() +
408 stub_size() +
409 consts_size() +
410 scopes_data_size() +
411 scopes_pcs_size() +
412 handler_table_size() +
413 nul_chk_table_size();
414 }
416 const char* nmethod::compile_kind() const {
417 if (is_osr_method()) return "osr";
418 if (method() != NULL && is_native_method()) return "c2n";
419 return NULL;
420 }
422 // %%% This variable is no longer used?
423 int nmethod::_zombie_instruction_size = NativeJump::instruction_size;
426 nmethod* nmethod::new_native_nmethod(methodHandle method,
427 CodeBuffer *code_buffer,
428 int vep_offset,
429 int frame_complete,
430 int frame_size,
431 ByteSize basic_lock_owner_sp_offset,
432 ByteSize basic_lock_sp_offset,
433 OopMapSet* oop_maps) {
434 // create nmethod
435 nmethod* nm = NULL;
436 {
437 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
438 int native_nmethod_size = allocation_size(code_buffer, sizeof(nmethod));
439 CodeOffsets offsets;
440 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
441 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
442 nm = new (native_nmethod_size)
443 nmethod(method(), native_nmethod_size, &offsets,
444 code_buffer, frame_size,
445 basic_lock_owner_sp_offset, basic_lock_sp_offset,
446 oop_maps);
447 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_native_nmethod(nm));
448 if (PrintAssembly && nm != NULL)
449 Disassembler::decode(nm);
450 }
451 // verify nmethod
452 debug_only(if (nm) nm->verify();) // might block
454 if (nm != NULL) {
455 nm->log_new_nmethod();
456 }
458 return nm;
459 }
461 #ifdef HAVE_DTRACE_H
462 nmethod* nmethod::new_dtrace_nmethod(methodHandle method,
463 CodeBuffer *code_buffer,
464 int vep_offset,
465 int trap_offset,
466 int frame_complete,
467 int frame_size) {
468 // create nmethod
469 nmethod* nm = NULL;
470 {
471 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
472 int nmethod_size = allocation_size(code_buffer, sizeof(nmethod));
473 CodeOffsets offsets;
474 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
475 offsets.set_value(CodeOffsets::Dtrace_trap, trap_offset);
476 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
478 nm = new (nmethod_size) nmethod(method(), nmethod_size, &offsets, code_buffer, frame_size);
480 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_nmethod(nm));
481 if (PrintAssembly && nm != NULL)
482 Disassembler::decode(nm);
483 }
484 // verify nmethod
485 debug_only(if (nm) nm->verify();) // might block
487 if (nm != NULL) {
488 nm->log_new_nmethod();
489 }
491 return nm;
492 }
494 #endif // def HAVE_DTRACE_H
496 nmethod* nmethod::new_nmethod(methodHandle method,
497 int compile_id,
498 int entry_bci,
499 CodeOffsets* offsets,
500 int orig_pc_offset,
501 DebugInformationRecorder* debug_info,
502 Dependencies* dependencies,
503 CodeBuffer* code_buffer, int frame_size,
504 OopMapSet* oop_maps,
505 ExceptionHandlerTable* handler_table,
506 ImplicitExceptionTable* nul_chk_table,
507 AbstractCompiler* compiler,
508 int comp_level
509 )
510 {
511 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
512 // create nmethod
513 nmethod* nm = NULL;
514 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
515 int nmethod_size =
516 allocation_size(code_buffer, sizeof(nmethod))
517 + adjust_pcs_size(debug_info->pcs_size())
518 + round_to(dependencies->size_in_bytes() , oopSize)
519 + round_to(handler_table->size_in_bytes(), oopSize)
520 + round_to(nul_chk_table->size_in_bytes(), oopSize)
521 + round_to(debug_info->data_size() , oopSize);
522 nm = new (nmethod_size)
523 nmethod(method(), nmethod_size, compile_id, entry_bci, offsets,
524 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size,
525 oop_maps,
526 handler_table,
527 nul_chk_table,
528 compiler,
529 comp_level);
530 if (nm != NULL) {
531 // To make dependency checking during class loading fast, record
532 // the nmethod dependencies in the classes it is dependent on.
533 // This allows the dependency checking code to simply walk the
534 // class hierarchy above the loaded class, checking only nmethods
535 // which are dependent on those classes. The slow way is to
536 // check every nmethod for dependencies which makes it linear in
537 // the number of methods compiled. For applications with a lot
538 // classes the slow way is too slow.
539 for (Dependencies::DepStream deps(nm); deps.next(); ) {
540 klassOop klass = deps.context_type();
541 if (klass == NULL) continue; // ignore things like evol_method
543 // record this nmethod as dependent on this klass
544 instanceKlass::cast(klass)->add_dependent_nmethod(nm);
545 }
546 }
547 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_nmethod(nm));
548 if (PrintAssembly && nm != NULL)
549 Disassembler::decode(nm);
550 }
552 // verify nmethod
553 debug_only(if (nm) nm->verify();) // might block
555 if (nm != NULL) {
556 nm->log_new_nmethod();
557 }
559 // done
560 return nm;
561 }
564 // For native wrappers
565 nmethod::nmethod(
566 methodOop method,
567 int nmethod_size,
568 CodeOffsets* offsets,
569 CodeBuffer* code_buffer,
570 int frame_size,
571 ByteSize basic_lock_owner_sp_offset,
572 ByteSize basic_lock_sp_offset,
573 OopMapSet* oop_maps )
574 : CodeBlob("native nmethod", code_buffer, sizeof(nmethod),
575 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps),
576 _compiled_synchronized_native_basic_lock_owner_sp_offset(basic_lock_owner_sp_offset),
577 _compiled_synchronized_native_basic_lock_sp_offset(basic_lock_sp_offset)
578 {
579 {
580 debug_only(No_Safepoint_Verifier nsv;)
581 assert_locked_or_safepoint(CodeCache_lock);
583 NOT_PRODUCT(_has_debug_info = false);
584 _oops_do_mark_link = NULL;
585 _method = method;
586 _entry_bci = InvocationEntryBci;
587 _osr_link = NULL;
588 _scavenge_root_link = NULL;
589 _scavenge_root_state = 0;
590 _saved_nmethod_link = NULL;
591 _compiler = NULL;
592 // We have no exception handler or deopt handler make the
593 // values something that will never match a pc like the nmethod vtable entry
594 _exception_offset = 0;
595 _deoptimize_offset = 0;
596 _orig_pc_offset = 0;
597 #ifdef HAVE_DTRACE_H
598 _trap_offset = 0;
599 #endif // def HAVE_DTRACE_H
600 _stub_offset = data_offset();
601 _consts_offset = data_offset();
602 _scopes_data_offset = data_offset();
603 _scopes_pcs_offset = _scopes_data_offset;
604 _dependencies_offset = _scopes_pcs_offset;
605 _handler_table_offset = _dependencies_offset;
606 _nul_chk_table_offset = _handler_table_offset;
607 _nmethod_end_offset = _nul_chk_table_offset;
608 _compile_id = 0; // default
609 _comp_level = CompLevel_none;
610 _entry_point = instructions_begin();
611 _verified_entry_point = instructions_begin() + offsets->value(CodeOffsets::Verified_Entry);
612 _osr_entry_point = NULL;
613 _exception_cache = NULL;
614 _pc_desc_cache.reset_to(NULL);
616 flags.clear();
617 flags.state = alive;
618 _markedForDeoptimization = 0;
620 _lock_count = 0;
621 _stack_traversal_mark = 0;
623 code_buffer->copy_oops_to(this);
624 debug_only(verify_scavenge_root_oops());
625 CodeCache::commit(this);
626 VTune::create_nmethod(this);
627 }
629 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
630 ttyLocker ttyl; // keep the following output all in one block
631 // This output goes directly to the tty, not the compiler log.
632 // To enable tools to match it up with the compilation activity,
633 // be sure to tag this tty output with the compile ID.
634 if (xtty != NULL) {
635 xtty->begin_head("print_native_nmethod");
636 xtty->method(_method);
637 xtty->stamp();
638 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
639 }
640 // print the header part first
641 print();
642 // then print the requested information
643 if (PrintNativeNMethods) {
644 print_code();
645 oop_maps->print();
646 }
647 if (PrintRelocations) {
648 print_relocations();
649 }
650 if (xtty != NULL) {
651 xtty->tail("print_native_nmethod");
652 }
653 }
654 Events::log("Create nmethod " INTPTR_FORMAT, this);
655 }
657 // For dtrace wrappers
658 #ifdef HAVE_DTRACE_H
659 nmethod::nmethod(
660 methodOop method,
661 int nmethod_size,
662 CodeOffsets* offsets,
663 CodeBuffer* code_buffer,
664 int frame_size)
665 : CodeBlob("dtrace nmethod", code_buffer, sizeof(nmethod),
666 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, NULL),
667 _compiled_synchronized_native_basic_lock_owner_sp_offset(in_ByteSize(-1)),
668 _compiled_synchronized_native_basic_lock_sp_offset(in_ByteSize(-1))
669 {
670 {
671 debug_only(No_Safepoint_Verifier nsv;)
672 assert_locked_or_safepoint(CodeCache_lock);
674 NOT_PRODUCT(_has_debug_info = false);
675 _oops_do_mark_link = NULL;
676 _method = method;
677 _entry_bci = InvocationEntryBci;
678 _osr_link = NULL;
679 _scavenge_root_link = NULL;
680 _scavenge_root_state = 0;
681 _compiler = NULL;
682 // We have no exception handler or deopt handler make the
683 // values something that will never match a pc like the nmethod vtable entry
684 _exception_offset = 0;
685 _deoptimize_offset = 0;
686 _trap_offset = offsets->value(CodeOffsets::Dtrace_trap);
687 _orig_pc_offset = 0;
688 _stub_offset = data_offset();
689 _consts_offset = data_offset();
690 _scopes_data_offset = data_offset();
691 _scopes_pcs_offset = _scopes_data_offset;
692 _dependencies_offset = _scopes_pcs_offset;
693 _handler_table_offset = _dependencies_offset;
694 _nul_chk_table_offset = _handler_table_offset;
695 _nmethod_end_offset = _nul_chk_table_offset;
696 _compile_id = 0; // default
697 _comp_level = CompLevel_none;
698 _entry_point = instructions_begin();
699 _verified_entry_point = instructions_begin() + offsets->value(CodeOffsets::Verified_Entry);
700 _osr_entry_point = NULL;
701 _exception_cache = NULL;
702 _pc_desc_cache.reset_to(NULL);
704 flags.clear();
705 flags.state = alive;
706 _markedForDeoptimization = 0;
708 _lock_count = 0;
709 _stack_traversal_mark = 0;
711 code_buffer->copy_oops_to(this);
712 debug_only(verify_scavenge_root_oops());
713 CodeCache::commit(this);
714 VTune::create_nmethod(this);
715 }
717 if (PrintNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
718 ttyLocker ttyl; // keep the following output all in one block
719 // This output goes directly to the tty, not the compiler log.
720 // To enable tools to match it up with the compilation activity,
721 // be sure to tag this tty output with the compile ID.
722 if (xtty != NULL) {
723 xtty->begin_head("print_dtrace_nmethod");
724 xtty->method(_method);
725 xtty->stamp();
726 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
727 }
728 // print the header part first
729 print();
730 // then print the requested information
731 if (PrintNMethods) {
732 print_code();
733 }
734 if (PrintRelocations) {
735 print_relocations();
736 }
737 if (xtty != NULL) {
738 xtty->tail("print_dtrace_nmethod");
739 }
740 }
741 Events::log("Create nmethod " INTPTR_FORMAT, this);
742 }
743 #endif // def HAVE_DTRACE_H
745 void* nmethod::operator new(size_t size, int nmethod_size) {
746 // Always leave some room in the CodeCache for I2C/C2I adapters
747 if (CodeCache::unallocated_capacity() < CodeCacheMinimumFreeSpace) return NULL;
748 return CodeCache::allocate(nmethod_size);
749 }
752 nmethod::nmethod(
753 methodOop method,
754 int nmethod_size,
755 int compile_id,
756 int entry_bci,
757 CodeOffsets* offsets,
758 int orig_pc_offset,
759 DebugInformationRecorder* debug_info,
760 Dependencies* dependencies,
761 CodeBuffer *code_buffer,
762 int frame_size,
763 OopMapSet* oop_maps,
764 ExceptionHandlerTable* handler_table,
765 ImplicitExceptionTable* nul_chk_table,
766 AbstractCompiler* compiler,
767 int comp_level
768 )
769 : CodeBlob("nmethod", code_buffer, sizeof(nmethod),
770 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps),
771 _compiled_synchronized_native_basic_lock_owner_sp_offset(in_ByteSize(-1)),
772 _compiled_synchronized_native_basic_lock_sp_offset(in_ByteSize(-1))
773 {
774 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
775 {
776 debug_only(No_Safepoint_Verifier nsv;)
777 assert_locked_or_safepoint(CodeCache_lock);
779 NOT_PRODUCT(_has_debug_info = false);
780 _oops_do_mark_link = NULL;
781 _method = method;
782 _compile_id = compile_id;
783 _comp_level = comp_level;
784 _entry_bci = entry_bci;
785 _osr_link = NULL;
786 _scavenge_root_link = NULL;
787 _scavenge_root_state = 0;
788 _compiler = compiler;
789 _orig_pc_offset = orig_pc_offset;
790 #ifdef HAVE_DTRACE_H
791 _trap_offset = 0;
792 #endif // def HAVE_DTRACE_H
793 _stub_offset = instructions_offset() + code_buffer->total_offset_of(code_buffer->stubs()->start());
795 // Exception handler and deopt handler are in the stub section
796 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
797 _deoptimize_offset = _stub_offset + offsets->value(CodeOffsets::Deopt);
798 _consts_offset = instructions_offset() + code_buffer->total_offset_of(code_buffer->consts()->start());
799 _scopes_data_offset = data_offset();
800 _scopes_pcs_offset = _scopes_data_offset + round_to(debug_info->data_size (), oopSize);
801 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
802 _handler_table_offset = _dependencies_offset + round_to(dependencies->size_in_bytes (), oopSize);
803 _nul_chk_table_offset = _handler_table_offset + round_to(handler_table->size_in_bytes(), oopSize);
804 _nmethod_end_offset = _nul_chk_table_offset + round_to(nul_chk_table->size_in_bytes(), oopSize);
806 _entry_point = instructions_begin();
807 _verified_entry_point = instructions_begin() + offsets->value(CodeOffsets::Verified_Entry);
808 _osr_entry_point = instructions_begin() + offsets->value(CodeOffsets::OSR_Entry);
809 _exception_cache = NULL;
810 _pc_desc_cache.reset_to(scopes_pcs_begin());
812 flags.clear();
813 flags.state = alive;
814 _markedForDeoptimization = 0;
816 _unload_reported = false; // jvmti state
818 _lock_count = 0;
819 _stack_traversal_mark = 0;
821 // Copy contents of ScopeDescRecorder to nmethod
822 code_buffer->copy_oops_to(this);
823 debug_info->copy_to(this);
824 dependencies->copy_to(this);
825 if (ScavengeRootsInCode && detect_scavenge_root_oops()) {
826 CodeCache::add_scavenge_root_nmethod(this);
827 }
828 debug_only(verify_scavenge_root_oops());
830 CodeCache::commit(this);
832 VTune::create_nmethod(this);
834 // Copy contents of ExceptionHandlerTable to nmethod
835 handler_table->copy_to(this);
836 nul_chk_table->copy_to(this);
838 // we use the information of entry points to find out if a method is
839 // static or non static
840 assert(compiler->is_c2() ||
841 _method->is_static() == (entry_point() == _verified_entry_point),
842 " entry points must be same for static methods and vice versa");
843 }
845 bool printnmethods = PrintNMethods
846 || CompilerOracle::should_print(_method)
847 || CompilerOracle::has_option_string(_method, "PrintNMethods");
848 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
849 print_nmethod(printnmethods);
850 }
852 // Note: Do not verify in here as the CodeCache_lock is
853 // taken which would conflict with the CompiledIC_lock
854 // which taken during the verification of call sites.
855 // (was bug - gri 10/25/99)
857 Events::log("Create nmethod " INTPTR_FORMAT, this);
858 }
861 // Print a short set of xml attributes to identify this nmethod. The
862 // output should be embedded in some other element.
863 void nmethod::log_identity(xmlStream* log) const {
864 log->print(" compile_id='%d'", compile_id());
865 const char* nm_kind = compile_kind();
866 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind);
867 if (compiler() != NULL) {
868 log->print(" compiler='%s'", compiler()->name());
869 }
870 #ifdef TIERED
871 log->print(" level='%d'", comp_level());
872 #endif // TIERED
873 }
876 #define LOG_OFFSET(log, name) \
877 if ((intptr_t)name##_end() - (intptr_t)name##_begin()) \
878 log->print(" " XSTR(name) "_offset='%d'" , \
879 (intptr_t)name##_begin() - (intptr_t)this)
882 void nmethod::log_new_nmethod() const {
883 if (LogCompilation && xtty != NULL) {
884 ttyLocker ttyl;
885 HandleMark hm;
886 xtty->begin_elem("nmethod");
887 log_identity(xtty);
888 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'",
889 instructions_begin(), size());
890 xtty->print(" address='" INTPTR_FORMAT "'", (intptr_t) this);
892 LOG_OFFSET(xtty, relocation);
893 LOG_OFFSET(xtty, code);
894 LOG_OFFSET(xtty, stub);
895 LOG_OFFSET(xtty, consts);
896 LOG_OFFSET(xtty, scopes_data);
897 LOG_OFFSET(xtty, scopes_pcs);
898 LOG_OFFSET(xtty, dependencies);
899 LOG_OFFSET(xtty, handler_table);
900 LOG_OFFSET(xtty, nul_chk_table);
901 LOG_OFFSET(xtty, oops);
903 xtty->method(method());
904 xtty->stamp();
905 xtty->end_elem();
906 }
907 }
909 #undef LOG_OFFSET
912 // Print out more verbose output usually for a newly created nmethod.
913 void nmethod::print_on(outputStream* st, const char* title) const {
914 if (st != NULL) {
915 ttyLocker ttyl;
916 // Print a little tag line that looks like +PrintCompilation output:
917 int tlen = (int) strlen(title);
918 bool do_nl = false;
919 if (tlen > 0 && title[tlen-1] == '\n') { tlen--; do_nl = true; }
920 st->print("%3d%c %.*s",
921 compile_id(),
922 is_osr_method() ? '%' :
923 method() != NULL &&
924 is_native_method() ? 'n' : ' ',
925 tlen, title);
926 #ifdef TIERED
927 st->print(" (%d) ", comp_level());
928 #endif // TIERED
929 if (WizardMode) st->print(" (" INTPTR_FORMAT ")", this);
930 if (Universe::heap()->is_gc_active() && method() != NULL) {
931 st->print("(method)");
932 } else if (method() != NULL) {
933 method()->print_short_name(st);
934 if (is_osr_method())
935 st->print(" @ %d", osr_entry_bci());
936 if (method()->code_size() > 0)
937 st->print(" (%d bytes)", method()->code_size());
938 }
940 if (do_nl) st->cr();
941 }
942 }
945 void nmethod::print_nmethod(bool printmethod) {
946 ttyLocker ttyl; // keep the following output all in one block
947 if (xtty != NULL) {
948 xtty->begin_head("print_nmethod");
949 xtty->stamp();
950 xtty->end_head();
951 }
952 // print the header part first
953 print();
954 // then print the requested information
955 if (printmethod) {
956 print_code();
957 print_pcs();
958 oop_maps()->print();
959 }
960 if (PrintDebugInfo) {
961 print_scopes();
962 }
963 if (PrintRelocations) {
964 print_relocations();
965 }
966 if (PrintDependencies) {
967 print_dependencies();
968 }
969 if (PrintExceptionHandlers) {
970 print_handler_table();
971 print_nul_chk_table();
972 }
973 if (xtty != NULL) {
974 xtty->tail("print_nmethod");
975 }
976 }
979 void nmethod::set_version(int v) {
980 flags.version = v;
981 }
984 ScopeDesc* nmethod::scope_desc_at(address pc) {
985 PcDesc* pd = pc_desc_at(pc);
986 guarantee(pd != NULL, "scope must be present");
987 return new ScopeDesc(this, pd->scope_decode_offset(),
988 pd->obj_decode_offset(), pd->should_reexecute());
989 }
992 void nmethod::clear_inline_caches() {
993 assert(SafepointSynchronize::is_at_safepoint(), "cleaning of IC's only allowed at safepoint");
994 if (is_zombie()) {
995 return;
996 }
998 RelocIterator iter(this);
999 while (iter.next()) {
1000 iter.reloc()->clear_inline_cache();
1001 }
1002 }
1005 void nmethod::cleanup_inline_caches() {
1007 assert(SafepointSynchronize::is_at_safepoint() &&
1008 !CompiledIC_lock->is_locked() &&
1009 !Patching_lock->is_locked(), "no threads must be updating the inline caches by them selfs");
1011 // If the method is not entrant or zombie then a JMP is plastered over the
1012 // first few bytes. If an oop in the old code was there, that oop
1013 // should not get GC'd. Skip the first few bytes of oops on
1014 // not-entrant methods.
1015 address low_boundary = verified_entry_point();
1016 if (!is_in_use()) {
1017 low_boundary += NativeJump::instruction_size;
1018 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1019 // This means that the low_boundary is going to be a little too high.
1020 // This shouldn't matter, since oops of non-entrant methods are never used.
1021 // In fact, why are we bothering to look at oops in a non-entrant method??
1022 }
1024 // Find all calls in an nmethod, and clear the ones that points to zombie methods
1025 ResourceMark rm;
1026 RelocIterator iter(this, low_boundary);
1027 while(iter.next()) {
1028 switch(iter.type()) {
1029 case relocInfo::virtual_call_type:
1030 case relocInfo::opt_virtual_call_type: {
1031 CompiledIC *ic = CompiledIC_at(iter.reloc());
1032 // Ok, to lookup references to zombies here
1033 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
1034 if( cb != NULL && cb->is_nmethod() ) {
1035 nmethod* nm = (nmethod*)cb;
1036 // Clean inline caches pointing to both zombie and not_entrant methods
1037 if (!nm->is_in_use() || (nm->method()->code() != nm)) ic->set_to_clean();
1038 }
1039 break;
1040 }
1041 case relocInfo::static_call_type: {
1042 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
1043 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
1044 if( cb != NULL && cb->is_nmethod() ) {
1045 nmethod* nm = (nmethod*)cb;
1046 // Clean inline caches pointing to both zombie and not_entrant methods
1047 if (!nm->is_in_use() || (nm->method()->code() != nm)) csc->set_to_clean();
1048 }
1049 break;
1050 }
1051 }
1052 }
1053 }
1055 // This is a private interface with the sweeper.
1056 void nmethod::mark_as_seen_on_stack() {
1057 assert(is_not_entrant(), "must be a non-entrant method");
1058 set_stack_traversal_mark(NMethodSweeper::traversal_count());
1059 }
1061 // Tell if a non-entrant method can be converted to a zombie (i.e., there is no activations on the stack)
1062 bool nmethod::can_not_entrant_be_converted() {
1063 assert(is_not_entrant(), "must be a non-entrant method");
1064 assert(SafepointSynchronize::is_at_safepoint(), "must be called during a safepoint");
1066 // Since the nmethod sweeper only does partial sweep the sweeper's traversal
1067 // count can be greater than the stack traversal count before it hits the
1068 // nmethod for the second time.
1069 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count();
1070 }
1072 void nmethod::inc_decompile_count() {
1073 // Could be gated by ProfileTraps, but do not bother...
1074 methodOop m = method();
1075 if (m == NULL) return;
1076 methodDataOop mdo = m->method_data();
1077 if (mdo == NULL) return;
1078 // There is a benign race here. See comments in methodDataOop.hpp.
1079 mdo->inc_decompile_count();
1080 }
1082 void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) {
1084 post_compiled_method_unload();
1086 // Since this nmethod is being unloaded, make sure that dependencies
1087 // recorded in instanceKlasses get flushed and pass non-NULL closure to
1088 // indicate that this work is being done during a GC.
1089 assert(Universe::heap()->is_gc_active(), "should only be called during gc");
1090 assert(is_alive != NULL, "Should be non-NULL");
1091 // A non-NULL is_alive closure indicates that this is being called during GC.
1092 flush_dependencies(is_alive);
1094 // Break cycle between nmethod & method
1095 if (TraceClassUnloading && WizardMode) {
1096 tty->print_cr("[Class unloading: Making nmethod " INTPTR_FORMAT
1097 " unloadable], methodOop(" INTPTR_FORMAT
1098 "), cause(" INTPTR_FORMAT ")",
1099 this, (address)_method, (address)cause);
1100 if (!Universe::heap()->is_gc_active())
1101 cause->klass()->print();
1102 }
1103 // Unlink the osr method, so we do not look this up again
1104 if (is_osr_method()) {
1105 invalidate_osr_method();
1106 }
1107 // If _method is already NULL the methodOop is about to be unloaded,
1108 // so we don't have to break the cycle. Note that it is possible to
1109 // have the methodOop live here, in case we unload the nmethod because
1110 // it is pointing to some oop (other than the methodOop) being unloaded.
1111 if (_method != NULL) {
1112 // OSR methods point to the methodOop, but the methodOop does not
1113 // point back!
1114 if (_method->code() == this) {
1115 _method->clear_code(); // Break a cycle
1116 }
1117 inc_decompile_count(); // Last chance to make a mark on the MDO
1118 _method = NULL; // Clear the method of this dead nmethod
1119 }
1120 // Make the class unloaded - i.e., change state and notify sweeper
1121 check_safepoint();
1122 if (is_in_use()) {
1123 // Transitioning directly from live to unloaded -- so
1124 // we need to force a cache clean-up; remember this
1125 // for later on.
1126 CodeCache::set_needs_cache_clean(true);
1127 }
1128 flags.state = unloaded;
1130 // Log the unloading.
1131 log_state_change();
1133 // The methodOop is gone at this point
1134 assert(_method == NULL, "Tautology");
1136 set_osr_link(NULL);
1137 //set_scavenge_root_link(NULL); // done by prune_scavenge_root_nmethods
1138 NMethodSweeper::notify(this);
1139 }
1141 void nmethod::invalidate_osr_method() {
1142 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
1143 // Remove from list of active nmethods
1144 if (method() != NULL)
1145 instanceKlass::cast(method()->method_holder())->remove_osr_nmethod(this);
1146 // Set entry as invalid
1147 _entry_bci = InvalidOSREntryBci;
1148 }
1150 void nmethod::log_state_change() const {
1151 if (LogCompilation) {
1152 if (xtty != NULL) {
1153 ttyLocker ttyl; // keep the following output all in one block
1154 if (flags.state == unloaded) {
1155 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'",
1156 os::current_thread_id());
1157 } else {
1158 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s",
1159 os::current_thread_id(),
1160 (flags.state == zombie ? " zombie='1'" : ""));
1161 }
1162 log_identity(xtty);
1163 xtty->stamp();
1164 xtty->end_elem();
1165 }
1166 }
1167 if (PrintCompilation && flags.state != unloaded) {
1168 print_on(tty, flags.state == zombie ? "made zombie " : "made not entrant ");
1169 tty->cr();
1170 }
1171 }
1173 // Common functionality for both make_not_entrant and make_zombie
1174 bool nmethod::make_not_entrant_or_zombie(unsigned int state) {
1175 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant");
1177 // If the method is already zombie there is nothing to do
1178 if (is_zombie()) {
1179 return false;
1180 }
1182 // Make sure the nmethod is not flushed in case of a safepoint in code below.
1183 nmethodLocker nml(this);
1185 {
1186 // invalidate osr nmethod before acquiring the patching lock since
1187 // they both acquire leaf locks and we don't want a deadlock.
1188 // This logic is equivalent to the logic below for patching the
1189 // verified entry point of regular methods.
1190 if (is_osr_method()) {
1191 // this effectively makes the osr nmethod not entrant
1192 invalidate_osr_method();
1193 }
1195 // Enter critical section. Does not block for safepoint.
1196 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1198 if (flags.state == state) {
1199 // another thread already performed this transition so nothing
1200 // to do, but return false to indicate this.
1201 return false;
1202 }
1204 // The caller can be calling the method statically or through an inline
1205 // cache call.
1206 if (!is_osr_method() && !is_not_entrant()) {
1207 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
1208 SharedRuntime::get_handle_wrong_method_stub());
1209 assert (NativeJump::instruction_size == nmethod::_zombie_instruction_size, "");
1210 }
1212 // When the nmethod becomes zombie it is no longer alive so the
1213 // dependencies must be flushed. nmethods in the not_entrant
1214 // state will be flushed later when the transition to zombie
1215 // happens or they get unloaded.
1216 if (state == zombie) {
1217 assert(SafepointSynchronize::is_at_safepoint(), "must be done at safepoint");
1218 flush_dependencies(NULL);
1219 } else {
1220 assert(state == not_entrant, "other cases may need to be handled differently");
1221 }
1223 // Change state
1224 flags.state = state;
1226 // Log the transition once
1227 log_state_change();
1229 } // leave critical region under Patching_lock
1231 if (state == not_entrant) {
1232 Events::log("Make nmethod not entrant " INTPTR_FORMAT, this);
1233 } else {
1234 Events::log("Make nmethod zombie " INTPTR_FORMAT, this);
1235 }
1237 if (TraceCreateZombies) {
1238 tty->print_cr("nmethod <" INTPTR_FORMAT "> code made %s", this, (state == not_entrant) ? "not entrant" : "zombie");
1239 }
1241 // Make sweeper aware that there is a zombie method that needs to be removed
1242 NMethodSweeper::notify(this);
1244 // not_entrant only stuff
1245 if (state == not_entrant) {
1246 mark_as_seen_on_stack();
1247 }
1249 // It's a true state change, so mark the method as decompiled.
1250 inc_decompile_count();
1252 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload event
1253 // and it hasn't already been reported for this nmethod then report it now.
1254 // (the event may have been reported earilier if the GC marked it for unloading).
1255 if (state == zombie) {
1257 DTRACE_METHOD_UNLOAD_PROBE(method());
1259 if (JvmtiExport::should_post_compiled_method_unload() &&
1260 !unload_reported()) {
1261 assert(method() != NULL, "checking");
1262 {
1263 HandleMark hm;
1264 JvmtiExport::post_compiled_method_unload_at_safepoint(
1265 method()->jmethod_id(), code_begin());
1266 }
1267 set_unload_reported();
1268 }
1269 }
1272 // Zombie only stuff
1273 if (state == zombie) {
1274 VTune::delete_nmethod(this);
1275 }
1277 // Check whether method got unloaded at a safepoint before this,
1278 // if so we can skip the flushing steps below
1279 if (method() == NULL) return true;
1281 // Remove nmethod from method.
1282 // We need to check if both the _code and _from_compiled_code_entry_point
1283 // refer to this nmethod because there is a race in setting these two fields
1284 // in methodOop as seen in bugid 4947125.
1285 // If the vep() points to the zombie nmethod, the memory for the nmethod
1286 // could be flushed and the compiler and vtable stubs could still call
1287 // through it.
1288 if (method()->code() == this ||
1289 method()->from_compiled_entry() == verified_entry_point()) {
1290 HandleMark hm;
1291 method()->clear_code();
1292 }
1294 return true;
1295 }
1298 #ifndef PRODUCT
1299 void nmethod::check_safepoint() {
1300 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
1301 }
1302 #endif
1305 void nmethod::flush() {
1306 // Note that there are no valid oops in the nmethod anymore.
1307 assert(is_zombie() || (is_osr_method() && is_unloaded()), "must be a zombie method");
1308 assert(is_marked_for_reclamation() || (is_osr_method() && is_unloaded()), "must be marked for reclamation");
1310 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed");
1311 check_safepoint();
1313 // completely deallocate this method
1314 EventMark m("flushing nmethod " INTPTR_FORMAT " %s", this, "");
1315 if (PrintMethodFlushing) {
1316 tty->print_cr("*flushing nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT "/Free CodeCache:" SIZE_FORMAT "Kb",
1317 _compile_id, this, CodeCache::nof_blobs(), CodeCache::unallocated_capacity()/1024);
1318 }
1320 // We need to deallocate any ExceptionCache data.
1321 // Note that we do not need to grab the nmethod lock for this, it
1322 // better be thread safe if we're disposing of it!
1323 ExceptionCache* ec = exception_cache();
1324 set_exception_cache(NULL);
1325 while(ec != NULL) {
1326 ExceptionCache* next = ec->next();
1327 delete ec;
1328 ec = next;
1329 }
1331 if (on_scavenge_root_list()) {
1332 CodeCache::drop_scavenge_root_nmethod(this);
1333 }
1335 if (is_speculatively_disconnected()) {
1336 CodeCache::remove_saved_code(this);
1337 }
1339 ((CodeBlob*)(this))->flush();
1341 CodeCache::free(this);
1342 }
1345 //
1346 // Notify all classes this nmethod is dependent on that it is no
1347 // longer dependent. This should only be called in two situations.
1348 // First, when a nmethod transitions to a zombie all dependents need
1349 // to be clear. Since zombification happens at a safepoint there's no
1350 // synchronization issues. The second place is a little more tricky.
1351 // During phase 1 of mark sweep class unloading may happen and as a
1352 // result some nmethods may get unloaded. In this case the flushing
1353 // of dependencies must happen during phase 1 since after GC any
1354 // dependencies in the unloaded nmethod won't be updated, so
1355 // traversing the dependency information in unsafe. In that case this
1356 // function is called with a non-NULL argument and this function only
1357 // notifies instanceKlasses that are reachable
1359 void nmethod::flush_dependencies(BoolObjectClosure* is_alive) {
1360 assert(SafepointSynchronize::is_at_safepoint(), "must be done at safepoint");
1361 assert(Universe::heap()->is_gc_active() == (is_alive != NULL),
1362 "is_alive is non-NULL if and only if we are called during GC");
1363 if (!has_flushed_dependencies()) {
1364 set_has_flushed_dependencies();
1365 for (Dependencies::DepStream deps(this); deps.next(); ) {
1366 klassOop klass = deps.context_type();
1367 if (klass == NULL) continue; // ignore things like evol_method
1369 // During GC the is_alive closure is non-NULL, and is used to
1370 // determine liveness of dependees that need to be updated.
1371 if (is_alive == NULL || is_alive->do_object_b(klass)) {
1372 instanceKlass::cast(klass)->remove_dependent_nmethod(this);
1373 }
1374 }
1375 }
1376 }
1379 // If this oop is not live, the nmethod can be unloaded.
1380 bool nmethod::can_unload(BoolObjectClosure* is_alive,
1381 OopClosure* keep_alive,
1382 oop* root, bool unloading_occurred) {
1383 assert(root != NULL, "just checking");
1384 oop obj = *root;
1385 if (obj == NULL || is_alive->do_object_b(obj)) {
1386 return false;
1387 }
1388 if (obj->is_compiledICHolder()) {
1389 compiledICHolderOop cichk_oop = compiledICHolderOop(obj);
1390 if (is_alive->do_object_b(
1391 cichk_oop->holder_method()->method_holder()) &&
1392 is_alive->do_object_b(cichk_oop->holder_klass())) {
1393 // The oop should be kept alive
1394 keep_alive->do_oop(root);
1395 return false;
1396 }
1397 }
1398 // If ScavengeRootsInCode is true, an nmethod might be unloaded
1399 // simply because one of its constant oops has gone dead.
1400 // No actual classes need to be unloaded in order for this to occur.
1401 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading");
1402 make_unloaded(is_alive, obj);
1403 return true;
1404 }
1406 // ------------------------------------------------------------------
1407 // post_compiled_method_load_event
1408 // new method for install_code() path
1409 // Transfer information from compilation to jvmti
1410 void nmethod::post_compiled_method_load_event() {
1412 methodOop moop = method();
1413 HS_DTRACE_PROBE8(hotspot, compiled__method__load,
1414 moop->klass_name()->bytes(),
1415 moop->klass_name()->utf8_length(),
1416 moop->name()->bytes(),
1417 moop->name()->utf8_length(),
1418 moop->signature()->bytes(),
1419 moop->signature()->utf8_length(),
1420 code_begin(), code_size());
1422 if (JvmtiExport::should_post_compiled_method_load()) {
1423 JvmtiExport::post_compiled_method_load(this);
1424 }
1425 }
1427 void nmethod::post_compiled_method_unload() {
1428 assert(_method != NULL && !is_unloaded(), "just checking");
1429 DTRACE_METHOD_UNLOAD_PROBE(method());
1431 // If a JVMTI agent has enabled the CompiledMethodUnload event then
1432 // post the event. Sometime later this nmethod will be made a zombie by
1433 // the sweeper but the methodOop will not be valid at that point.
1434 if (JvmtiExport::should_post_compiled_method_unload()) {
1435 assert(!unload_reported(), "already unloaded");
1436 HandleMark hm;
1437 JvmtiExport::post_compiled_method_unload_at_safepoint(
1438 method()->jmethod_id(), code_begin());
1439 }
1441 // The JVMTI CompiledMethodUnload event can be enabled or disabled at
1442 // any time. As the nmethod is being unloaded now we mark it has
1443 // having the unload event reported - this will ensure that we don't
1444 // attempt to report the event in the unlikely scenario where the
1445 // event is enabled at the time the nmethod is made a zombie.
1446 set_unload_reported();
1447 }
1449 // This is called at the end of the strong tracing/marking phase of a
1450 // GC to unload an nmethod if it contains otherwise unreachable
1451 // oops.
1453 void nmethod::do_unloading(BoolObjectClosure* is_alive,
1454 OopClosure* keep_alive, bool unloading_occurred) {
1455 // Make sure the oop's ready to receive visitors
1456 assert(!is_zombie() && !is_unloaded(),
1457 "should not call follow on zombie or unloaded nmethod");
1459 // If the method is not entrant then a JMP is plastered over the
1460 // first few bytes. If an oop in the old code was there, that oop
1461 // should not get GC'd. Skip the first few bytes of oops on
1462 // not-entrant methods.
1463 address low_boundary = verified_entry_point();
1464 if (is_not_entrant()) {
1465 low_boundary += NativeJump::instruction_size;
1466 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1467 // (See comment above.)
1468 }
1470 // The RedefineClasses() API can cause the class unloading invariant
1471 // to no longer be true. See jvmtiExport.hpp for details.
1472 // Also, leave a debugging breadcrumb in local flag.
1473 bool a_class_was_redefined = JvmtiExport::has_redefined_a_class();
1474 if (a_class_was_redefined) {
1475 // This set of the unloading_occurred flag is done before the
1476 // call to post_compiled_method_unload() so that the unloading
1477 // of this nmethod is reported.
1478 unloading_occurred = true;
1479 }
1481 // Follow methodOop
1482 if (can_unload(is_alive, keep_alive, (oop*)&_method, unloading_occurred)) {
1483 return;
1484 }
1486 // Exception cache
1487 ExceptionCache* ec = exception_cache();
1488 while (ec != NULL) {
1489 oop* ex_addr = (oop*)ec->exception_type_addr();
1490 oop ex = *ex_addr;
1491 ExceptionCache* next_ec = ec->next();
1492 if (ex != NULL && !is_alive->do_object_b(ex)) {
1493 assert(!ex->is_compiledICHolder(), "Possible error here");
1494 remove_from_exception_cache(ec);
1495 }
1496 ec = next_ec;
1497 }
1499 // If class unloading occurred we first iterate over all inline caches and
1500 // clear ICs where the cached oop is referring to an unloaded klass or method.
1501 // The remaining live cached oops will be traversed in the relocInfo::oop_type
1502 // iteration below.
1503 if (unloading_occurred) {
1504 RelocIterator iter(this, low_boundary);
1505 while(iter.next()) {
1506 if (iter.type() == relocInfo::virtual_call_type) {
1507 CompiledIC *ic = CompiledIC_at(iter.reloc());
1508 oop ic_oop = ic->cached_oop();
1509 if (ic_oop != NULL && !is_alive->do_object_b(ic_oop)) {
1510 // The only exception is compiledICHolder oops which may
1511 // yet be marked below. (We check this further below).
1512 if (ic_oop->is_compiledICHolder()) {
1513 compiledICHolderOop cichk_oop = compiledICHolderOop(ic_oop);
1514 if (is_alive->do_object_b(
1515 cichk_oop->holder_method()->method_holder()) &&
1516 is_alive->do_object_b(cichk_oop->holder_klass())) {
1517 continue;
1518 }
1519 }
1520 ic->set_to_clean();
1521 assert(ic->cached_oop() == NULL, "cached oop in IC should be cleared")
1522 }
1523 }
1524 }
1525 }
1527 // Compiled code
1528 RelocIterator iter(this, low_boundary);
1529 while (iter.next()) {
1530 if (iter.type() == relocInfo::oop_type) {
1531 oop_Relocation* r = iter.oop_reloc();
1532 // In this loop, we must only traverse those oops directly embedded in
1533 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1534 assert(1 == (r->oop_is_immediate()) +
1535 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1536 "oop must be found in exactly one place");
1537 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1538 if (can_unload(is_alive, keep_alive, r->oop_addr(), unloading_occurred)) {
1539 return;
1540 }
1541 }
1542 }
1543 }
1546 // Scopes
1547 for (oop* p = oops_begin(); p < oops_end(); p++) {
1548 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1549 if (can_unload(is_alive, keep_alive, p, unloading_occurred)) {
1550 return;
1551 }
1552 }
1554 #ifndef PRODUCT
1555 // This nmethod was not unloaded; check below that all CompiledICs
1556 // refer to marked oops.
1557 {
1558 RelocIterator iter(this, low_boundary);
1559 while (iter.next()) {
1560 if (iter.type() == relocInfo::virtual_call_type) {
1561 CompiledIC *ic = CompiledIC_at(iter.reloc());
1562 oop ic_oop = ic->cached_oop();
1563 assert(ic_oop == NULL || is_alive->do_object_b(ic_oop),
1564 "Found unmarked ic_oop in reachable nmethod");
1565 }
1566 }
1567 }
1568 #endif // !PRODUCT
1569 }
1571 // This method is called twice during GC -- once while
1572 // tracing the "active" nmethods on thread stacks during
1573 // the (strong) marking phase, and then again when walking
1574 // the code cache contents during the weak roots processing
1575 // phase. The two uses are distinguished by means of the
1576 // 'do_strong_roots_only' flag, which is true in the first
1577 // case. We want to walk the weak roots in the nmethod
1578 // only in the second case. The weak roots in the nmethod
1579 // are the oops in the ExceptionCache and the InlineCache
1580 // oops.
1581 void nmethod::oops_do(OopClosure* f, bool do_strong_roots_only) {
1582 // make sure the oops ready to receive visitors
1583 assert(!is_zombie() && !is_unloaded(),
1584 "should not call follow on zombie or unloaded nmethod");
1586 // If the method is not entrant or zombie then a JMP is plastered over the
1587 // first few bytes. If an oop in the old code was there, that oop
1588 // should not get GC'd. Skip the first few bytes of oops on
1589 // not-entrant methods.
1590 address low_boundary = verified_entry_point();
1591 if (is_not_entrant()) {
1592 low_boundary += NativeJump::instruction_size;
1593 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1594 // (See comment above.)
1595 }
1597 // Compiled code
1598 f->do_oop((oop*) &_method);
1599 if (!do_strong_roots_only) {
1600 // weak roots processing phase -- update ExceptionCache oops
1601 ExceptionCache* ec = exception_cache();
1602 while(ec != NULL) {
1603 f->do_oop((oop*)ec->exception_type_addr());
1604 ec = ec->next();
1605 }
1606 } // Else strong roots phase -- skip oops in ExceptionCache
1608 RelocIterator iter(this, low_boundary);
1610 while (iter.next()) {
1611 if (iter.type() == relocInfo::oop_type ) {
1612 oop_Relocation* r = iter.oop_reloc();
1613 // In this loop, we must only follow those oops directly embedded in
1614 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1615 assert(1 == (r->oop_is_immediate()) +
1616 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1617 "oop must be found in exactly one place");
1618 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1619 f->do_oop(r->oop_addr());
1620 }
1621 }
1622 }
1624 // Scopes
1625 // This includes oop constants not inlined in the code stream.
1626 for (oop* p = oops_begin(); p < oops_end(); p++) {
1627 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1628 f->do_oop(p);
1629 }
1630 }
1632 #define NMETHOD_SENTINEL ((nmethod*)badAddress)
1634 nmethod* volatile nmethod::_oops_do_mark_nmethods;
1636 // An nmethod is "marked" if its _mark_link is set non-null.
1637 // Even if it is the end of the linked list, it will have a non-null link value,
1638 // as long as it is on the list.
1639 // This code must be MP safe, because it is used from parallel GC passes.
1640 bool nmethod::test_set_oops_do_mark() {
1641 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");
1642 nmethod* observed_mark_link = _oops_do_mark_link;
1643 if (observed_mark_link == NULL) {
1644 // Claim this nmethod for this thread to mark.
1645 observed_mark_link = (nmethod*)
1646 Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_link, NULL);
1647 if (observed_mark_link == NULL) {
1649 // Atomically append this nmethod (now claimed) to the head of the list:
1650 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods;
1651 for (;;) {
1652 nmethod* required_mark_nmethods = observed_mark_nmethods;
1653 _oops_do_mark_link = required_mark_nmethods;
1654 observed_mark_nmethods = (nmethod*)
1655 Atomic::cmpxchg_ptr(this, &_oops_do_mark_nmethods, required_mark_nmethods);
1656 if (observed_mark_nmethods == required_mark_nmethods)
1657 break;
1658 }
1659 // Mark was clear when we first saw this guy.
1660 NOT_PRODUCT(if (TraceScavenge) print_on(tty, "oops_do, mark\n"));
1661 return false;
1662 }
1663 }
1664 // On fall through, another racing thread marked this nmethod before we did.
1665 return true;
1666 }
1668 void nmethod::oops_do_marking_prologue() {
1669 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("[oops_do_marking_prologue"));
1670 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row");
1671 // We use cmpxchg_ptr instead of regular assignment here because the user
1672 // may fork a bunch of threads, and we need them all to see the same state.
1673 void* observed = Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, NULL);
1674 guarantee(observed == NULL, "no races in this sequential code");
1675 }
1677 void nmethod::oops_do_marking_epilogue() {
1678 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row");
1679 nmethod* cur = _oops_do_mark_nmethods;
1680 while (cur != NMETHOD_SENTINEL) {
1681 assert(cur != NULL, "not NULL-terminated");
1682 nmethod* next = cur->_oops_do_mark_link;
1683 cur->_oops_do_mark_link = NULL;
1684 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark\n"));
1685 cur = next;
1686 }
1687 void* required = _oops_do_mark_nmethods;
1688 void* observed = Atomic::cmpxchg_ptr(NULL, &_oops_do_mark_nmethods, required);
1689 guarantee(observed == required, "no races in this sequential code");
1690 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("oops_do_marking_epilogue]"));
1691 }
1693 class DetectScavengeRoot: public OopClosure {
1694 bool _detected_scavenge_root;
1695 public:
1696 DetectScavengeRoot() : _detected_scavenge_root(false)
1697 { NOT_PRODUCT(_print_nm = NULL); }
1698 bool detected_scavenge_root() { return _detected_scavenge_root; }
1699 virtual void do_oop(oop* p) {
1700 if ((*p) != NULL && (*p)->is_scavengable()) {
1701 NOT_PRODUCT(maybe_print(p));
1702 _detected_scavenge_root = true;
1703 }
1704 }
1705 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
1707 #ifndef PRODUCT
1708 nmethod* _print_nm;
1709 void maybe_print(oop* p) {
1710 if (_print_nm == NULL) return;
1711 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root");
1712 tty->print_cr(""PTR_FORMAT"[offset=%d] detected non-perm oop "PTR_FORMAT" (found at "PTR_FORMAT")",
1713 _print_nm, (int)((intptr_t)p - (intptr_t)_print_nm),
1714 (intptr_t)(*p), (intptr_t)p);
1715 (*p)->print();
1716 }
1717 #endif //PRODUCT
1718 };
1720 bool nmethod::detect_scavenge_root_oops() {
1721 DetectScavengeRoot detect_scavenge_root;
1722 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this);
1723 oops_do(&detect_scavenge_root);
1724 return detect_scavenge_root.detected_scavenge_root();
1725 }
1727 // Method that knows how to preserve outgoing arguments at call. This method must be
1728 // called with a frame corresponding to a Java invoke
1729 void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) {
1730 if (!method()->is_native()) {
1731 SimpleScopeDesc ssd(this, fr.pc());
1732 Bytecode_invoke* call = Bytecode_invoke_at(ssd.method(), ssd.bci());
1733 bool has_receiver = call->has_receiver();
1734 symbolOop signature = call->signature();
1735 fr.oops_compiled_arguments_do(signature, has_receiver, reg_map, f);
1736 }
1737 }
1740 oop nmethod::embeddedOop_at(u_char* p) {
1741 RelocIterator iter(this, p, p + oopSize);
1742 while (iter.next())
1743 if (iter.type() == relocInfo::oop_type) {
1744 return iter.oop_reloc()->oop_value();
1745 }
1746 return NULL;
1747 }
1750 inline bool includes(void* p, void* from, void* to) {
1751 return from <= p && p < to;
1752 }
1755 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
1756 assert(count >= 2, "must be sentinel values, at least");
1758 #ifdef ASSERT
1759 // must be sorted and unique; we do a binary search in find_pc_desc()
1760 int prev_offset = pcs[0].pc_offset();
1761 assert(prev_offset == PcDesc::lower_offset_limit,
1762 "must start with a sentinel");
1763 for (int i = 1; i < count; i++) {
1764 int this_offset = pcs[i].pc_offset();
1765 assert(this_offset > prev_offset, "offsets must be sorted");
1766 prev_offset = this_offset;
1767 }
1768 assert(prev_offset == PcDesc::upper_offset_limit,
1769 "must end with a sentinel");
1770 #endif //ASSERT
1772 // Search for MethodHandle invokes and tag the nmethod.
1773 for (int i = 0; i < count; i++) {
1774 if (pcs[i].is_method_handle_invoke()) {
1775 set_has_method_handle_invokes(true);
1776 break;
1777 }
1778 }
1780 int size = count * sizeof(PcDesc);
1781 assert(scopes_pcs_size() >= size, "oob");
1782 memcpy(scopes_pcs_begin(), pcs, size);
1784 // Adjust the final sentinel downward.
1785 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
1786 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
1787 last_pc->set_pc_offset(instructions_size() + 1);
1788 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
1789 // Fill any rounding gaps with copies of the last record.
1790 last_pc[1] = last_pc[0];
1791 }
1792 // The following assert could fail if sizeof(PcDesc) is not
1793 // an integral multiple of oopSize (the rounding term).
1794 // If it fails, change the logic to always allocate a multiple
1795 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
1796 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
1797 }
1799 void nmethod::copy_scopes_data(u_char* buffer, int size) {
1800 assert(scopes_data_size() >= size, "oob");
1801 memcpy(scopes_data_begin(), buffer, size);
1802 }
1805 #ifdef ASSERT
1806 static PcDesc* linear_search(nmethod* nm, int pc_offset, bool approximate) {
1807 PcDesc* lower = nm->scopes_pcs_begin();
1808 PcDesc* upper = nm->scopes_pcs_end();
1809 lower += 1; // exclude initial sentinel
1810 PcDesc* res = NULL;
1811 for (PcDesc* p = lower; p < upper; p++) {
1812 NOT_PRODUCT(--nmethod_stats.pc_desc_tests); // don't count this call to match_desc
1813 if (match_desc(p, pc_offset, approximate)) {
1814 if (res == NULL)
1815 res = p;
1816 else
1817 res = (PcDesc*) badAddress;
1818 }
1819 }
1820 return res;
1821 }
1822 #endif
1825 // Finds a PcDesc with real-pc equal to "pc"
1826 PcDesc* nmethod::find_pc_desc_internal(address pc, bool approximate) {
1827 address base_address = instructions_begin();
1828 if ((pc < base_address) ||
1829 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
1830 return NULL; // PC is wildly out of range
1831 }
1832 int pc_offset = (int) (pc - base_address);
1834 // Check the PcDesc cache if it contains the desired PcDesc
1835 // (This as an almost 100% hit rate.)
1836 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
1837 if (res != NULL) {
1838 assert(res == linear_search(this, pc_offset, approximate), "cache ok");
1839 return res;
1840 }
1842 // Fallback algorithm: quasi-linear search for the PcDesc
1843 // Find the last pc_offset less than the given offset.
1844 // The successor must be the required match, if there is a match at all.
1845 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
1846 PcDesc* lower = scopes_pcs_begin();
1847 PcDesc* upper = scopes_pcs_end();
1848 upper -= 1; // exclude final sentinel
1849 if (lower >= upper) return NULL; // native method; no PcDescs at all
1851 #define assert_LU_OK \
1852 /* invariant on lower..upper during the following search: */ \
1853 assert(lower->pc_offset() < pc_offset, "sanity"); \
1854 assert(upper->pc_offset() >= pc_offset, "sanity")
1855 assert_LU_OK;
1857 // Use the last successful return as a split point.
1858 PcDesc* mid = _pc_desc_cache.last_pc_desc();
1859 NOT_PRODUCT(++nmethod_stats.pc_desc_searches);
1860 if (mid->pc_offset() < pc_offset) {
1861 lower = mid;
1862 } else {
1863 upper = mid;
1864 }
1866 // Take giant steps at first (4096, then 256, then 16, then 1)
1867 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
1868 const int RADIX = (1 << LOG2_RADIX);
1869 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
1870 while ((mid = lower + step) < upper) {
1871 assert_LU_OK;
1872 NOT_PRODUCT(++nmethod_stats.pc_desc_searches);
1873 if (mid->pc_offset() < pc_offset) {
1874 lower = mid;
1875 } else {
1876 upper = mid;
1877 break;
1878 }
1879 }
1880 assert_LU_OK;
1881 }
1883 // Sneak up on the value with a linear search of length ~16.
1884 while (true) {
1885 assert_LU_OK;
1886 mid = lower + 1;
1887 NOT_PRODUCT(++nmethod_stats.pc_desc_searches);
1888 if (mid->pc_offset() < pc_offset) {
1889 lower = mid;
1890 } else {
1891 upper = mid;
1892 break;
1893 }
1894 }
1895 #undef assert_LU_OK
1897 if (match_desc(upper, pc_offset, approximate)) {
1898 assert(upper == linear_search(this, pc_offset, approximate), "search ok");
1899 _pc_desc_cache.add_pc_desc(upper);
1900 return upper;
1901 } else {
1902 assert(NULL == linear_search(this, pc_offset, approximate), "search ok");
1903 return NULL;
1904 }
1905 }
1908 bool nmethod::check_all_dependencies() {
1909 bool found_check = false;
1910 // wholesale check of all dependencies
1911 for (Dependencies::DepStream deps(this); deps.next(); ) {
1912 if (deps.check_dependency() != NULL) {
1913 found_check = true;
1914 NOT_DEBUG(break);
1915 }
1916 }
1917 return found_check; // tell caller if we found anything
1918 }
1920 bool nmethod::check_dependency_on(DepChange& changes) {
1921 // What has happened:
1922 // 1) a new class dependee has been added
1923 // 2) dependee and all its super classes have been marked
1924 bool found_check = false; // set true if we are upset
1925 for (Dependencies::DepStream deps(this); deps.next(); ) {
1926 // Evaluate only relevant dependencies.
1927 if (deps.spot_check_dependency_at(changes) != NULL) {
1928 found_check = true;
1929 NOT_DEBUG(break);
1930 }
1931 }
1932 return found_check;
1933 }
1935 bool nmethod::is_evol_dependent_on(klassOop dependee) {
1936 instanceKlass *dependee_ik = instanceKlass::cast(dependee);
1937 objArrayOop dependee_methods = dependee_ik->methods();
1938 for (Dependencies::DepStream deps(this); deps.next(); ) {
1939 if (deps.type() == Dependencies::evol_method) {
1940 methodOop method = deps.method_argument(0);
1941 for (int j = 0; j < dependee_methods->length(); j++) {
1942 if ((methodOop) dependee_methods->obj_at(j) == method) {
1943 // RC_TRACE macro has an embedded ResourceMark
1944 RC_TRACE(0x01000000,
1945 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)",
1946 _method->method_holder()->klass_part()->external_name(),
1947 _method->name()->as_C_string(),
1948 _method->signature()->as_C_string(), compile_id(),
1949 method->method_holder()->klass_part()->external_name(),
1950 method->name()->as_C_string(),
1951 method->signature()->as_C_string()));
1952 if (TraceDependencies || LogCompilation)
1953 deps.log_dependency(dependee);
1954 return true;
1955 }
1956 }
1957 }
1958 }
1959 return false;
1960 }
1962 // Called from mark_for_deoptimization, when dependee is invalidated.
1963 bool nmethod::is_dependent_on_method(methodOop dependee) {
1964 for (Dependencies::DepStream deps(this); deps.next(); ) {
1965 if (deps.type() != Dependencies::evol_method)
1966 continue;
1967 methodOop method = deps.method_argument(0);
1968 if (method == dependee) return true;
1969 }
1970 return false;
1971 }
1974 bool nmethod::is_patchable_at(address instr_addr) {
1975 assert (code_contains(instr_addr), "wrong nmethod used");
1976 if (is_zombie()) {
1977 // a zombie may never be patched
1978 return false;
1979 }
1980 return true;
1981 }
1984 address nmethod::continuation_for_implicit_exception(address pc) {
1985 // Exception happened outside inline-cache check code => we are inside
1986 // an active nmethod => use cpc to determine a return address
1987 int exception_offset = pc - instructions_begin();
1988 int cont_offset = ImplicitExceptionTable(this).at( exception_offset );
1989 #ifdef ASSERT
1990 if (cont_offset == 0) {
1991 Thread* thread = ThreadLocalStorage::get_thread_slow();
1992 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
1993 HandleMark hm(thread);
1994 ResourceMark rm(thread);
1995 CodeBlob* cb = CodeCache::find_blob(pc);
1996 assert(cb != NULL && cb == this, "");
1997 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, pc);
1998 print();
1999 method()->print_codes();
2000 print_code();
2001 print_pcs();
2002 }
2003 #endif
2004 guarantee(cont_offset != 0, "unhandled implicit exception in compiled code");
2005 return instructions_begin() + cont_offset;
2006 }
2010 void nmethod_init() {
2011 // make sure you didn't forget to adjust the filler fields
2012 assert(sizeof(nmFlags) <= 4, "nmFlags occupies more than a word");
2013 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
2014 }
2017 //-------------------------------------------------------------------------------------------
2020 // QQQ might we make this work from a frame??
2021 nmethodLocker::nmethodLocker(address pc) {
2022 CodeBlob* cb = CodeCache::find_blob(pc);
2023 guarantee(cb != NULL && cb->is_nmethod(), "bad pc for a nmethod found");
2024 _nm = (nmethod*)cb;
2025 lock_nmethod(_nm);
2026 }
2028 void nmethodLocker::lock_nmethod(nmethod* nm) {
2029 if (nm == NULL) return;
2030 Atomic::inc(&nm->_lock_count);
2031 guarantee(!nm->is_zombie(), "cannot lock a zombie method");
2032 }
2034 void nmethodLocker::unlock_nmethod(nmethod* nm) {
2035 if (nm == NULL) return;
2036 Atomic::dec(&nm->_lock_count);
2037 guarantee(nm->_lock_count >= 0, "unmatched nmethod lock/unlock");
2038 }
2040 bool nmethod::is_deopt_pc(address pc) {
2041 bool ret = pc == deopt_handler_begin();
2042 return ret;
2043 }
2046 // -----------------------------------------------------------------------------
2047 // MethodHandle
2049 bool nmethod::is_method_handle_return(address return_pc) {
2050 if (!has_method_handle_invokes()) return false;
2051 PcDesc* pd = pc_desc_at(return_pc);
2052 if (pd == NULL)
2053 return false;
2054 return pd->is_method_handle_invoke();
2055 }
2058 // -----------------------------------------------------------------------------
2059 // Verification
2061 class VerifyOopsClosure: public OopClosure {
2062 nmethod* _nm;
2063 bool _ok;
2064 public:
2065 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
2066 bool ok() { return _ok; }
2067 virtual void do_oop(oop* p) {
2068 if ((*p) == NULL || (*p)->is_oop()) return;
2069 if (_ok) {
2070 _nm->print_nmethod(true);
2071 _ok = false;
2072 }
2073 tty->print_cr("*** non-oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)",
2074 (intptr_t)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm));
2075 }
2076 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2077 };
2079 void nmethod::verify() {
2081 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant
2082 // seems odd.
2084 if( is_zombie() || is_not_entrant() )
2085 return;
2087 // Make sure all the entry points are correctly aligned for patching.
2088 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
2090 assert(method()->is_oop(), "must be valid");
2092 ResourceMark rm;
2094 if (!CodeCache::contains(this)) {
2095 fatal1("nmethod at " INTPTR_FORMAT " not in zone", this);
2096 }
2098 if(is_native_method() )
2099 return;
2101 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
2102 if (nm != this) {
2103 fatal1("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", this);
2104 }
2106 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2107 if (! p->verify(this)) {
2108 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", this);
2109 }
2110 }
2112 VerifyOopsClosure voc(this);
2113 oops_do(&voc);
2114 assert(voc.ok(), "embedded oops must be OK");
2115 verify_scavenge_root_oops();
2117 verify_scopes();
2118 }
2121 void nmethod::verify_interrupt_point(address call_site) {
2122 // This code does not work in release mode since
2123 // owns_lock only is available in debug mode.
2124 CompiledIC* ic = NULL;
2125 Thread *cur = Thread::current();
2126 if (CompiledIC_lock->owner() == cur ||
2127 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) &&
2128 SafepointSynchronize::is_at_safepoint())) {
2129 ic = CompiledIC_at(call_site);
2130 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
2131 } else {
2132 MutexLocker ml_verify (CompiledIC_lock);
2133 ic = CompiledIC_at(call_site);
2134 }
2135 PcDesc* pd = pc_desc_at(ic->end_of_call());
2136 assert(pd != NULL, "PcDesc must exist");
2137 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(),
2138 pd->obj_decode_offset(), pd->should_reexecute());
2139 !sd->is_top(); sd = sd->sender()) {
2140 sd->verify();
2141 }
2142 }
2144 void nmethod::verify_scopes() {
2145 if( !method() ) return; // Runtime stubs have no scope
2146 if (method()->is_native()) return; // Ignore stub methods.
2147 // iterate through all interrupt point
2148 // and verify the debug information is valid.
2149 RelocIterator iter((nmethod*)this);
2150 while (iter.next()) {
2151 address stub = NULL;
2152 switch (iter.type()) {
2153 case relocInfo::virtual_call_type:
2154 verify_interrupt_point(iter.addr());
2155 break;
2156 case relocInfo::opt_virtual_call_type:
2157 stub = iter.opt_virtual_call_reloc()->static_stub();
2158 verify_interrupt_point(iter.addr());
2159 break;
2160 case relocInfo::static_call_type:
2161 stub = iter.static_call_reloc()->static_stub();
2162 //verify_interrupt_point(iter.addr());
2163 break;
2164 case relocInfo::runtime_call_type:
2165 address destination = iter.reloc()->value();
2166 // Right now there is no way to find out which entries support
2167 // an interrupt point. It would be nice if we had this
2168 // information in a table.
2169 break;
2170 }
2171 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section");
2172 }
2173 }
2176 // -----------------------------------------------------------------------------
2177 // Non-product code
2178 #ifndef PRODUCT
2180 class DebugScavengeRoot: public OopClosure {
2181 nmethod* _nm;
2182 bool _ok;
2183 public:
2184 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { }
2185 bool ok() { return _ok; }
2186 virtual void do_oop(oop* p) {
2187 if ((*p) == NULL || !(*p)->is_scavengable()) return;
2188 if (_ok) {
2189 _nm->print_nmethod(true);
2190 _ok = false;
2191 }
2192 tty->print_cr("*** non-perm oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)",
2193 (intptr_t)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm));
2194 (*p)->print();
2195 }
2196 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2197 };
2199 void nmethod::verify_scavenge_root_oops() {
2200 if (!on_scavenge_root_list()) {
2201 // Actually look inside, to verify the claim that it's clean.
2202 DebugScavengeRoot debug_scavenge_root(this);
2203 oops_do(&debug_scavenge_root);
2204 if (!debug_scavenge_root.ok())
2205 fatal("found an unadvertised bad non-perm oop in the code cache");
2206 }
2207 assert(scavenge_root_not_marked(), "");
2208 }
2210 #endif // PRODUCT
2212 // Printing operations
2214 void nmethod::print() const {
2215 ResourceMark rm;
2216 ttyLocker ttyl; // keep the following output all in one block
2218 tty->print("Compiled ");
2220 if (is_compiled_by_c1()) {
2221 tty->print("(c1) ");
2222 } else if (is_compiled_by_c2()) {
2223 tty->print("(c2) ");
2224 } else {
2225 tty->print("(nm) ");
2226 }
2228 print_on(tty, "nmethod");
2229 tty->cr();
2230 if (WizardMode) {
2231 tty->print("((nmethod*) "INTPTR_FORMAT ") ", this);
2232 tty->print(" for method " INTPTR_FORMAT , (address)method());
2233 tty->print(" { ");
2234 if (version()) tty->print("v%d ", version());
2235 if (level()) tty->print("l%d ", level());
2236 if (is_in_use()) tty->print("in_use ");
2237 if (is_not_entrant()) tty->print("not_entrant ");
2238 if (is_zombie()) tty->print("zombie ");
2239 if (is_unloaded()) tty->print("unloaded ");
2240 if (on_scavenge_root_list()) tty->print("scavenge_root ");
2241 tty->print_cr("}:");
2242 }
2243 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2244 (address)this,
2245 (address)this + size(),
2246 size());
2247 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2248 relocation_begin(),
2249 relocation_end(),
2250 relocation_size());
2251 if (code_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2252 code_begin(),
2253 code_end(),
2254 code_size());
2255 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2256 stub_begin(),
2257 stub_end(),
2258 stub_size());
2259 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2260 consts_begin(),
2261 consts_end(),
2262 consts_size());
2263 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2264 scopes_data_begin(),
2265 scopes_data_end(),
2266 scopes_data_size());
2267 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2268 scopes_pcs_begin(),
2269 scopes_pcs_end(),
2270 scopes_pcs_size());
2271 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2272 dependencies_begin(),
2273 dependencies_end(),
2274 dependencies_size());
2275 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2276 handler_table_begin(),
2277 handler_table_end(),
2278 handler_table_size());
2279 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2280 nul_chk_table_begin(),
2281 nul_chk_table_end(),
2282 nul_chk_table_size());
2283 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2284 oops_begin(),
2285 oops_end(),
2286 oops_size());
2287 }
2289 void nmethod::print_code() {
2290 HandleMark hm;
2291 ResourceMark m;
2292 Disassembler::decode(this);
2293 }
2296 #ifndef PRODUCT
2298 void nmethod::print_scopes() {
2299 // Find the first pc desc for all scopes in the code and print it.
2300 ResourceMark rm;
2301 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2302 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
2303 continue;
2305 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
2306 sd->print_on(tty, p);
2307 }
2308 }
2310 void nmethod::print_dependencies() {
2311 ResourceMark rm;
2312 ttyLocker ttyl; // keep the following output all in one block
2313 tty->print_cr("Dependencies:");
2314 for (Dependencies::DepStream deps(this); deps.next(); ) {
2315 deps.print_dependency();
2316 klassOop ctxk = deps.context_type();
2317 if (ctxk != NULL) {
2318 Klass* k = Klass::cast(ctxk);
2319 if (k->oop_is_instance() && ((instanceKlass*)k)->is_dependent_nmethod(this)) {
2320 tty->print_cr(" [nmethod<=klass]%s", k->external_name());
2321 }
2322 }
2323 deps.log_dependency(); // put it into the xml log also
2324 }
2325 }
2328 void nmethod::print_relocations() {
2329 ResourceMark m; // in case methods get printed via the debugger
2330 tty->print_cr("relocations:");
2331 RelocIterator iter(this);
2332 iter.print();
2333 if (UseRelocIndex) {
2334 jint* index_end = (jint*)relocation_end() - 1;
2335 jint index_size = *index_end;
2336 jint* index_start = (jint*)( (address)index_end - index_size );
2337 tty->print_cr(" index @" INTPTR_FORMAT ": index_size=%d", index_start, index_size);
2338 if (index_size > 0) {
2339 jint* ip;
2340 for (ip = index_start; ip+2 <= index_end; ip += 2)
2341 tty->print_cr(" (%d %d) addr=" INTPTR_FORMAT " @" INTPTR_FORMAT,
2342 ip[0],
2343 ip[1],
2344 header_end()+ip[0],
2345 relocation_begin()-1+ip[1]);
2346 for (; ip < index_end; ip++)
2347 tty->print_cr(" (%d ?)", ip[0]);
2348 tty->print_cr(" @" INTPTR_FORMAT ": index_size=%d", ip, *ip++);
2349 tty->print_cr("reloc_end @" INTPTR_FORMAT ":", ip);
2350 }
2351 }
2352 }
2355 void nmethod::print_pcs() {
2356 ResourceMark m; // in case methods get printed via debugger
2357 tty->print_cr("pc-bytecode offsets:");
2358 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2359 p->print(this);
2360 }
2361 }
2363 #endif // PRODUCT
2365 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
2366 RelocIterator iter(this, begin, end);
2367 bool have_one = false;
2368 while (iter.next()) {
2369 have_one = true;
2370 switch (iter.type()) {
2371 case relocInfo::none: return "no_reloc";
2372 case relocInfo::oop_type: {
2373 stringStream st;
2374 oop_Relocation* r = iter.oop_reloc();
2375 oop obj = r->oop_value();
2376 st.print("oop(");
2377 if (obj == NULL) st.print("NULL");
2378 else obj->print_value_on(&st);
2379 st.print(")");
2380 return st.as_string();
2381 }
2382 case relocInfo::virtual_call_type: return "virtual_call";
2383 case relocInfo::opt_virtual_call_type: return "optimized virtual_call";
2384 case relocInfo::static_call_type: return "static_call";
2385 case relocInfo::static_stub_type: return "static_stub";
2386 case relocInfo::runtime_call_type: return "runtime_call";
2387 case relocInfo::external_word_type: return "external_word";
2388 case relocInfo::internal_word_type: return "internal_word";
2389 case relocInfo::section_word_type: return "section_word";
2390 case relocInfo::poll_type: return "poll";
2391 case relocInfo::poll_return_type: return "poll_return";
2392 case relocInfo::type_mask: return "type_bit_mask";
2393 }
2394 }
2395 return have_one ? "other" : NULL;
2396 }
2398 // Return a the last scope in (begin..end]
2399 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
2400 PcDesc* p = pc_desc_near(begin+1);
2401 if (p != NULL && p->real_pc(this) <= end) {
2402 return new ScopeDesc(this, p->scope_decode_offset(),
2403 p->obj_decode_offset(), p->should_reexecute());
2404 }
2405 return NULL;
2406 }
2408 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) {
2409 if (block_begin == entry_point()) stream->print_cr("[Entry Point]");
2410 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]");
2411 if (block_begin == exception_begin()) stream->print_cr("[Exception Handler]");
2412 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]");
2413 if (block_begin == consts_begin()) stream->print_cr("[Constants]");
2414 if (block_begin == entry_point()) {
2415 methodHandle m = method();
2416 if (m.not_null()) {
2417 stream->print(" # ");
2418 m->print_value_on(stream);
2419 stream->cr();
2420 }
2421 if (m.not_null() && !is_osr_method()) {
2422 ResourceMark rm;
2423 int sizeargs = m->size_of_parameters();
2424 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
2425 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
2426 {
2427 int sig_index = 0;
2428 if (!m->is_static())
2429 sig_bt[sig_index++] = T_OBJECT; // 'this'
2430 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) {
2431 BasicType t = ss.type();
2432 sig_bt[sig_index++] = t;
2433 if (type2size[t] == 2) {
2434 sig_bt[sig_index++] = T_VOID;
2435 } else {
2436 assert(type2size[t] == 1, "size is 1 or 2");
2437 }
2438 }
2439 assert(sig_index == sizeargs, "");
2440 }
2441 const char* spname = "sp"; // make arch-specific?
2442 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false);
2443 int stack_slot_offset = this->frame_size() * wordSize;
2444 int tab1 = 14, tab2 = 24;
2445 int sig_index = 0;
2446 int arg_index = (m->is_static() ? 0 : -1);
2447 bool did_old_sp = false;
2448 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) {
2449 bool at_this = (arg_index == -1);
2450 bool at_old_sp = false;
2451 BasicType t = (at_this ? T_OBJECT : ss.type());
2452 assert(t == sig_bt[sig_index], "sigs in sync");
2453 if (at_this)
2454 stream->print(" # this: ");
2455 else
2456 stream->print(" # parm%d: ", arg_index);
2457 stream->move_to(tab1);
2458 VMReg fst = regs[sig_index].first();
2459 VMReg snd = regs[sig_index].second();
2460 if (fst->is_reg()) {
2461 stream->print("%s", fst->name());
2462 if (snd->is_valid()) {
2463 stream->print(":%s", snd->name());
2464 }
2465 } else if (fst->is_stack()) {
2466 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
2467 if (offset == stack_slot_offset) at_old_sp = true;
2468 stream->print("[%s+0x%x]", spname, offset);
2469 } else {
2470 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
2471 }
2472 stream->print(" ");
2473 stream->move_to(tab2);
2474 stream->print("= ");
2475 if (at_this) {
2476 m->method_holder()->print_value_on(stream);
2477 } else {
2478 bool did_name = false;
2479 if (!at_this && ss.is_object()) {
2480 symbolOop name = ss.as_symbol_or_null();
2481 if (name != NULL) {
2482 name->print_value_on(stream);
2483 did_name = true;
2484 }
2485 }
2486 if (!did_name)
2487 stream->print("%s", type2name(t));
2488 }
2489 if (at_old_sp) {
2490 stream->print(" (%s of caller)", spname);
2491 did_old_sp = true;
2492 }
2493 stream->cr();
2494 sig_index += type2size[t];
2495 arg_index += 1;
2496 if (!at_this) ss.next();
2497 }
2498 if (!did_old_sp) {
2499 stream->print(" # ");
2500 stream->move_to(tab1);
2501 stream->print("[%s+0x%x]", spname, stack_slot_offset);
2502 stream->print(" (%s of caller)", spname);
2503 stream->cr();
2504 }
2505 }
2506 }
2507 }
2509 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) {
2510 // First, find an oopmap in (begin, end].
2511 // We use the odd half-closed interval so that oop maps and scope descs
2512 // which are tied to the byte after a call are printed with the call itself.
2513 address base = instructions_begin();
2514 OopMapSet* oms = oop_maps();
2515 if (oms != NULL) {
2516 for (int i = 0, imax = oms->size(); i < imax; i++) {
2517 OopMap* om = oms->at(i);
2518 address pc = base + om->offset();
2519 if (pc > begin) {
2520 if (pc <= end) {
2521 st->move_to(column);
2522 st->print("; ");
2523 om->print_on(st);
2524 }
2525 break;
2526 }
2527 }
2528 }
2530 // Print any debug info present at this pc.
2531 ScopeDesc* sd = scope_desc_in(begin, end);
2532 if (sd != NULL) {
2533 st->move_to(column);
2534 if (sd->bci() == SynchronizationEntryBCI) {
2535 st->print(";*synchronization entry");
2536 } else {
2537 if (sd->method().is_null()) {
2538 st->print("method is NULL");
2539 } else if (sd->method()->is_native()) {
2540 st->print("method is native");
2541 } else {
2542 address bcp = sd->method()->bcp_from(sd->bci());
2543 Bytecodes::Code bc = Bytecodes::java_code_at(bcp);
2544 st->print(";*%s", Bytecodes::name(bc));
2545 switch (bc) {
2546 case Bytecodes::_invokevirtual:
2547 case Bytecodes::_invokespecial:
2548 case Bytecodes::_invokestatic:
2549 case Bytecodes::_invokeinterface:
2550 {
2551 Bytecode_invoke* invoke = Bytecode_invoke_at(sd->method(), sd->bci());
2552 st->print(" ");
2553 if (invoke->name() != NULL)
2554 invoke->name()->print_symbol_on(st);
2555 else
2556 st->print("<UNKNOWN>");
2557 break;
2558 }
2559 case Bytecodes::_getfield:
2560 case Bytecodes::_putfield:
2561 case Bytecodes::_getstatic:
2562 case Bytecodes::_putstatic:
2563 {
2564 methodHandle sdm = sd->method();
2565 Bytecode_field* field = Bytecode_field_at(sdm(), sdm->bcp_from(sd->bci()));
2566 constantPoolOop sdmc = sdm->constants();
2567 symbolOop name = sdmc->name_ref_at(field->index());
2568 st->print(" ");
2569 if (name != NULL)
2570 name->print_symbol_on(st);
2571 else
2572 st->print("<UNKNOWN>");
2573 }
2574 }
2575 }
2576 }
2578 // Print all scopes
2579 for (;sd != NULL; sd = sd->sender()) {
2580 st->move_to(column);
2581 st->print("; -");
2582 if (sd->method().is_null()) {
2583 st->print("method is NULL");
2584 } else {
2585 sd->method()->print_short_name(st);
2586 }
2587 int lineno = sd->method()->line_number_from_bci(sd->bci());
2588 if (lineno != -1) {
2589 st->print("@%d (line %d)", sd->bci(), lineno);
2590 } else {
2591 st->print("@%d", sd->bci());
2592 }
2593 st->cr();
2594 }
2595 }
2597 // Print relocation information
2598 const char* str = reloc_string_for(begin, end);
2599 if (str != NULL) {
2600 if (sd != NULL) st->cr();
2601 st->move_to(column);
2602 st->print("; {%s}", str);
2603 }
2604 int cont_offset = ImplicitExceptionTable(this).at(begin - instructions_begin());
2605 if (cont_offset != 0) {
2606 st->move_to(column);
2607 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, instructions_begin() + cont_offset);
2608 }
2610 }
2612 #ifndef PRODUCT
2614 void nmethod::print_value_on(outputStream* st) const {
2615 print_on(st, "nmethod");
2616 }
2618 void nmethod::print_calls(outputStream* st) {
2619 RelocIterator iter(this);
2620 while (iter.next()) {
2621 switch (iter.type()) {
2622 case relocInfo::virtual_call_type:
2623 case relocInfo::opt_virtual_call_type: {
2624 VerifyMutexLocker mc(CompiledIC_lock);
2625 CompiledIC_at(iter.reloc())->print();
2626 break;
2627 }
2628 case relocInfo::static_call_type:
2629 st->print_cr("Static call at " INTPTR_FORMAT, iter.reloc()->addr());
2630 compiledStaticCall_at(iter.reloc())->print();
2631 break;
2632 }
2633 }
2634 }
2636 void nmethod::print_handler_table() {
2637 ExceptionHandlerTable(this).print();
2638 }
2640 void nmethod::print_nul_chk_table() {
2641 ImplicitExceptionTable(this).print(instructions_begin());
2642 }
2644 void nmethod::print_statistics() {
2645 ttyLocker ttyl;
2646 if (xtty != NULL) xtty->head("statistics type='nmethod'");
2647 nmethod_stats.print_native_nmethod_stats();
2648 nmethod_stats.print_nmethod_stats();
2649 DebugInformationRecorder::print_statistics();
2650 nmethod_stats.print_pc_stats();
2651 Dependencies::print_statistics();
2652 if (xtty != NULL) xtty->tail("statistics");
2653 }
2655 #endif // PRODUCT