Mon, 21 Jun 2010 14:26:17 -0700
6656830: assert((*p)->is_oop(),"expected an oop while scanning weak refs")
Reviewed-by: dcubed, kvn, twisti
1 /*
2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
25 # include "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 oops_size += nm->oops_size();
103 scopes_data_size += nm->scopes_data_size();
104 scopes_pcs_size += nm->scopes_pcs_size();
105 dependencies_size += nm->dependencies_size();
106 handler_table_size += nm->handler_table_size();
107 nul_chk_table_size += nm->nul_chk_table_size();
108 }
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 (oops_size != 0) tty->print_cr(" oops = %d", oops_size);
118 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size);
119 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size);
120 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size);
121 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size);
122 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size);
123 }
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 _jmethod_id = NULL;
588 _osr_link = NULL;
589 _scavenge_root_link = NULL;
590 _scavenge_root_state = 0;
591 _saved_nmethod_link = NULL;
592 _compiler = NULL;
593 // We have no exception handler or deopt handler make the
594 // values something that will never match a pc like the nmethod vtable entry
595 _exception_offset = 0;
596 _deoptimize_offset = 0;
597 _deoptimize_mh_offset = 0;
598 _orig_pc_offset = 0;
599 #ifdef HAVE_DTRACE_H
600 _trap_offset = 0;
601 #endif // def HAVE_DTRACE_H
602 _stub_offset = data_offset();
603 _consts_offset = data_offset();
604 _oops_offset = data_offset();
605 _scopes_data_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize);
606 _scopes_pcs_offset = _scopes_data_offset;
607 _dependencies_offset = _scopes_pcs_offset;
608 _handler_table_offset = _dependencies_offset;
609 _nul_chk_table_offset = _handler_table_offset;
610 _nmethod_end_offset = _nul_chk_table_offset;
611 _compile_id = 0; // default
612 _comp_level = CompLevel_none;
613 _entry_point = instructions_begin();
614 _verified_entry_point = instructions_begin() + offsets->value(CodeOffsets::Verified_Entry);
615 _osr_entry_point = NULL;
616 _exception_cache = NULL;
617 _pc_desc_cache.reset_to(NULL);
619 flags.clear();
620 flags.state = alive;
621 _markedForDeoptimization = 0;
623 _lock_count = 0;
624 _stack_traversal_mark = 0;
626 code_buffer->copy_oops_to(this);
627 debug_only(verify_scavenge_root_oops());
628 CodeCache::commit(this);
629 VTune::create_nmethod(this);
630 }
632 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
633 ttyLocker ttyl; // keep the following output all in one block
634 // This output goes directly to the tty, not the compiler log.
635 // To enable tools to match it up with the compilation activity,
636 // be sure to tag this tty output with the compile ID.
637 if (xtty != NULL) {
638 xtty->begin_head("print_native_nmethod");
639 xtty->method(_method);
640 xtty->stamp();
641 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
642 }
643 // print the header part first
644 print();
645 // then print the requested information
646 if (PrintNativeNMethods) {
647 print_code();
648 oop_maps->print();
649 }
650 if (PrintRelocations) {
651 print_relocations();
652 }
653 if (xtty != NULL) {
654 xtty->tail("print_native_nmethod");
655 }
656 }
657 Events::log("Create nmethod " INTPTR_FORMAT, this);
658 }
660 // For dtrace wrappers
661 #ifdef HAVE_DTRACE_H
662 nmethod::nmethod(
663 methodOop method,
664 int nmethod_size,
665 CodeOffsets* offsets,
666 CodeBuffer* code_buffer,
667 int frame_size)
668 : CodeBlob("dtrace nmethod", code_buffer, sizeof(nmethod),
669 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, NULL),
670 _compiled_synchronized_native_basic_lock_owner_sp_offset(in_ByteSize(-1)),
671 _compiled_synchronized_native_basic_lock_sp_offset(in_ByteSize(-1))
672 {
673 {
674 debug_only(No_Safepoint_Verifier nsv;)
675 assert_locked_or_safepoint(CodeCache_lock);
677 NOT_PRODUCT(_has_debug_info = false);
678 _oops_do_mark_link = NULL;
679 _method = method;
680 _entry_bci = InvocationEntryBci;
681 _jmethod_id = NULL;
682 _osr_link = NULL;
683 _scavenge_root_link = NULL;
684 _scavenge_root_state = 0;
685 _compiler = NULL;
686 // We have no exception handler or deopt handler make the
687 // values something that will never match a pc like the nmethod vtable entry
688 _exception_offset = 0;
689 _deoptimize_offset = 0;
690 _deoptimize_mh_offset = 0;
691 _unwind_handler_offset = -1;
692 _trap_offset = offsets->value(CodeOffsets::Dtrace_trap);
693 _orig_pc_offset = 0;
694 _stub_offset = data_offset();
695 _consts_offset = data_offset();
696 _oops_offset = data_offset();
697 _scopes_data_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize);
698 _scopes_pcs_offset = _scopes_data_offset;
699 _dependencies_offset = _scopes_pcs_offset;
700 _handler_table_offset = _dependencies_offset;
701 _nul_chk_table_offset = _handler_table_offset;
702 _nmethod_end_offset = _nul_chk_table_offset;
703 _compile_id = 0; // default
704 _comp_level = CompLevel_none;
705 _entry_point = instructions_begin();
706 _verified_entry_point = instructions_begin() + offsets->value(CodeOffsets::Verified_Entry);
707 _osr_entry_point = NULL;
708 _exception_cache = NULL;
709 _pc_desc_cache.reset_to(NULL);
711 flags.clear();
712 flags.state = alive;
713 _markedForDeoptimization = 0;
715 _lock_count = 0;
716 _stack_traversal_mark = 0;
718 code_buffer->copy_oops_to(this);
719 debug_only(verify_scavenge_root_oops());
720 CodeCache::commit(this);
721 VTune::create_nmethod(this);
722 }
724 if (PrintNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
725 ttyLocker ttyl; // keep the following output all in one block
726 // This output goes directly to the tty, not the compiler log.
727 // To enable tools to match it up with the compilation activity,
728 // be sure to tag this tty output with the compile ID.
729 if (xtty != NULL) {
730 xtty->begin_head("print_dtrace_nmethod");
731 xtty->method(_method);
732 xtty->stamp();
733 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
734 }
735 // print the header part first
736 print();
737 // then print the requested information
738 if (PrintNMethods) {
739 print_code();
740 }
741 if (PrintRelocations) {
742 print_relocations();
743 }
744 if (xtty != NULL) {
745 xtty->tail("print_dtrace_nmethod");
746 }
747 }
748 Events::log("Create nmethod " INTPTR_FORMAT, this);
749 }
750 #endif // def HAVE_DTRACE_H
752 void* nmethod::operator new(size_t size, int nmethod_size) {
753 // Always leave some room in the CodeCache for I2C/C2I adapters
754 if (CodeCache::unallocated_capacity() < CodeCacheMinimumFreeSpace) return NULL;
755 return CodeCache::allocate(nmethod_size);
756 }
759 nmethod::nmethod(
760 methodOop method,
761 int nmethod_size,
762 int compile_id,
763 int entry_bci,
764 CodeOffsets* offsets,
765 int orig_pc_offset,
766 DebugInformationRecorder* debug_info,
767 Dependencies* dependencies,
768 CodeBuffer *code_buffer,
769 int frame_size,
770 OopMapSet* oop_maps,
771 ExceptionHandlerTable* handler_table,
772 ImplicitExceptionTable* nul_chk_table,
773 AbstractCompiler* compiler,
774 int comp_level
775 )
776 : CodeBlob("nmethod", code_buffer, sizeof(nmethod),
777 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps),
778 _compiled_synchronized_native_basic_lock_owner_sp_offset(in_ByteSize(-1)),
779 _compiled_synchronized_native_basic_lock_sp_offset(in_ByteSize(-1))
780 {
781 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
782 {
783 debug_only(No_Safepoint_Verifier nsv;)
784 assert_locked_or_safepoint(CodeCache_lock);
786 NOT_PRODUCT(_has_debug_info = false);
787 _oops_do_mark_link = NULL;
788 _method = method;
789 _jmethod_id = NULL;
790 _compile_id = compile_id;
791 _comp_level = comp_level;
792 _entry_bci = entry_bci;
793 _osr_link = NULL;
794 _scavenge_root_link = NULL;
795 _scavenge_root_state = 0;
796 _compiler = compiler;
797 _orig_pc_offset = orig_pc_offset;
798 #ifdef HAVE_DTRACE_H
799 _trap_offset = 0;
800 #endif // def HAVE_DTRACE_H
801 _stub_offset = instructions_offset() + code_buffer->total_offset_of(code_buffer->stubs()->start());
803 // Exception handler and deopt handler are in the stub section
804 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
805 _deoptimize_offset = _stub_offset + offsets->value(CodeOffsets::Deopt);
806 _deoptimize_mh_offset = _stub_offset + offsets->value(CodeOffsets::DeoptMH);
807 if (offsets->value(CodeOffsets::UnwindHandler) != -1) {
808 _unwind_handler_offset = instructions_offset() + offsets->value(CodeOffsets::UnwindHandler);
809 } else {
810 _unwind_handler_offset = -1;
811 }
812 _consts_offset = instructions_offset() + code_buffer->total_offset_of(code_buffer->consts()->start());
813 _oops_offset = data_offset();
814 _scopes_data_offset = _oops_offset + round_to(code_buffer->total_oop_size (), oopSize);
815 _scopes_pcs_offset = _scopes_data_offset + round_to(debug_info->data_size (), oopSize);
816 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
817 _handler_table_offset = _dependencies_offset + round_to(dependencies->size_in_bytes (), oopSize);
818 _nul_chk_table_offset = _handler_table_offset + round_to(handler_table->size_in_bytes(), oopSize);
819 _nmethod_end_offset = _nul_chk_table_offset + round_to(nul_chk_table->size_in_bytes(), oopSize);
821 _entry_point = instructions_begin();
822 _verified_entry_point = instructions_begin() + offsets->value(CodeOffsets::Verified_Entry);
823 _osr_entry_point = instructions_begin() + offsets->value(CodeOffsets::OSR_Entry);
824 _exception_cache = NULL;
825 _pc_desc_cache.reset_to(scopes_pcs_begin());
827 flags.clear();
828 flags.state = alive;
829 _markedForDeoptimization = 0;
831 _unload_reported = false; // jvmti state
833 _lock_count = 0;
834 _stack_traversal_mark = 0;
836 // Copy contents of ScopeDescRecorder to nmethod
837 code_buffer->copy_oops_to(this);
838 debug_info->copy_to(this);
839 dependencies->copy_to(this);
840 if (ScavengeRootsInCode && detect_scavenge_root_oops()) {
841 CodeCache::add_scavenge_root_nmethod(this);
842 }
843 debug_only(verify_scavenge_root_oops());
845 CodeCache::commit(this);
847 VTune::create_nmethod(this);
849 // Copy contents of ExceptionHandlerTable to nmethod
850 handler_table->copy_to(this);
851 nul_chk_table->copy_to(this);
853 // we use the information of entry points to find out if a method is
854 // static or non static
855 assert(compiler->is_c2() ||
856 _method->is_static() == (entry_point() == _verified_entry_point),
857 " entry points must be same for static methods and vice versa");
858 }
860 bool printnmethods = PrintNMethods
861 || CompilerOracle::should_print(_method)
862 || CompilerOracle::has_option_string(_method, "PrintNMethods");
863 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
864 print_nmethod(printnmethods);
865 }
867 // Note: Do not verify in here as the CodeCache_lock is
868 // taken which would conflict with the CompiledIC_lock
869 // which taken during the verification of call sites.
870 // (was bug - gri 10/25/99)
872 Events::log("Create nmethod " INTPTR_FORMAT, this);
873 }
876 // Print a short set of xml attributes to identify this nmethod. The
877 // output should be embedded in some other element.
878 void nmethod::log_identity(xmlStream* log) const {
879 log->print(" compile_id='%d'", compile_id());
880 const char* nm_kind = compile_kind();
881 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind);
882 if (compiler() != NULL) {
883 log->print(" compiler='%s'", compiler()->name());
884 }
885 #ifdef TIERED
886 log->print(" level='%d'", comp_level());
887 #endif // TIERED
888 }
891 #define LOG_OFFSET(log, name) \
892 if ((intptr_t)name##_end() - (intptr_t)name##_begin()) \
893 log->print(" " XSTR(name) "_offset='%d'" , \
894 (intptr_t)name##_begin() - (intptr_t)this)
897 void nmethod::log_new_nmethod() const {
898 if (LogCompilation && xtty != NULL) {
899 ttyLocker ttyl;
900 HandleMark hm;
901 xtty->begin_elem("nmethod");
902 log_identity(xtty);
903 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'",
904 instructions_begin(), size());
905 xtty->print(" address='" INTPTR_FORMAT "'", (intptr_t) this);
907 LOG_OFFSET(xtty, relocation);
908 LOG_OFFSET(xtty, code);
909 LOG_OFFSET(xtty, stub);
910 LOG_OFFSET(xtty, consts);
911 LOG_OFFSET(xtty, scopes_data);
912 LOG_OFFSET(xtty, scopes_pcs);
913 LOG_OFFSET(xtty, dependencies);
914 LOG_OFFSET(xtty, handler_table);
915 LOG_OFFSET(xtty, nul_chk_table);
916 LOG_OFFSET(xtty, oops);
918 xtty->method(method());
919 xtty->stamp();
920 xtty->end_elem();
921 }
922 }
924 #undef LOG_OFFSET
927 // Print out more verbose output usually for a newly created nmethod.
928 void nmethod::print_on(outputStream* st, const char* title) const {
929 if (st != NULL) {
930 ttyLocker ttyl;
931 // Print a little tag line that looks like +PrintCompilation output:
932 int tlen = (int) strlen(title);
933 bool do_nl = false;
934 if (tlen > 0 && title[tlen-1] == '\n') { tlen--; do_nl = true; }
935 st->print("%3d%c %.*s",
936 compile_id(),
937 is_osr_method() ? '%' :
938 method() != NULL &&
939 is_native_method() ? 'n' : ' ',
940 tlen, title);
941 #ifdef TIERED
942 st->print(" (%d) ", comp_level());
943 #endif // TIERED
944 if (WizardMode) st->print(" (" INTPTR_FORMAT ")", this);
945 if (Universe::heap()->is_gc_active() && method() != NULL) {
946 st->print("(method)");
947 } else if (method() != NULL) {
948 method()->print_short_name(st);
949 if (is_osr_method())
950 st->print(" @ %d", osr_entry_bci());
951 if (method()->code_size() > 0)
952 st->print(" (%d bytes)", method()->code_size());
953 }
955 if (do_nl) st->cr();
956 }
957 }
960 void nmethod::print_nmethod(bool printmethod) {
961 ttyLocker ttyl; // keep the following output all in one block
962 if (xtty != NULL) {
963 xtty->begin_head("print_nmethod");
964 xtty->stamp();
965 xtty->end_head();
966 }
967 // print the header part first
968 print();
969 // then print the requested information
970 if (printmethod) {
971 print_code();
972 print_pcs();
973 oop_maps()->print();
974 }
975 if (PrintDebugInfo) {
976 print_scopes();
977 }
978 if (PrintRelocations) {
979 print_relocations();
980 }
981 if (PrintDependencies) {
982 print_dependencies();
983 }
984 if (PrintExceptionHandlers) {
985 print_handler_table();
986 print_nul_chk_table();
987 }
988 if (xtty != NULL) {
989 xtty->tail("print_nmethod");
990 }
991 }
994 void nmethod::set_version(int v) {
995 flags.version = v;
996 }
999 // Promote one word from an assembly-time handle to a live embedded oop.
1000 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
1001 if (handle == NULL ||
1002 // As a special case, IC oops are initialized to 1 or -1.
1003 handle == (jobject) Universe::non_oop_word()) {
1004 (*dest) = (oop) handle;
1005 } else {
1006 (*dest) = JNIHandles::resolve_non_null(handle);
1007 }
1008 }
1011 void nmethod::copy_oops(GrowableArray<jobject>* array) {
1012 //assert(oops_size() == 0, "do this handshake just once, please");
1013 int length = array->length();
1014 assert((address)(oops_begin() + length) <= data_end(), "oops big enough");
1015 oop* dest = oops_begin();
1016 for (int index = 0 ; index < length; index++) {
1017 initialize_immediate_oop(&dest[index], array->at(index));
1018 }
1020 // Now we can fix up all the oops in the code. We need to do this
1021 // in the code because the assembler uses jobjects as placeholders.
1022 // The code and relocations have already been initialized by the
1023 // CodeBlob constructor, so it is valid even at this early point to
1024 // iterate over relocations and patch the code.
1025 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true);
1026 }
1029 bool nmethod::is_at_poll_return(address pc) {
1030 RelocIterator iter(this, pc, pc+1);
1031 while (iter.next()) {
1032 if (iter.type() == relocInfo::poll_return_type)
1033 return true;
1034 }
1035 return false;
1036 }
1039 bool nmethod::is_at_poll_or_poll_return(address pc) {
1040 RelocIterator iter(this, pc, pc+1);
1041 while (iter.next()) {
1042 relocInfo::relocType t = iter.type();
1043 if (t == relocInfo::poll_return_type || t == relocInfo::poll_type)
1044 return true;
1045 }
1046 return false;
1047 }
1050 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) {
1051 // re-patch all oop-bearing instructions, just in case some oops moved
1052 RelocIterator iter(this, begin, end);
1053 while (iter.next()) {
1054 if (iter.type() == relocInfo::oop_type) {
1055 oop_Relocation* reloc = iter.oop_reloc();
1056 if (initialize_immediates && reloc->oop_is_immediate()) {
1057 oop* dest = reloc->oop_addr();
1058 initialize_immediate_oop(dest, (jobject) *dest);
1059 }
1060 // Refresh the oop-related bits of this instruction.
1061 reloc->fix_oop_relocation();
1062 }
1064 // There must not be any interfering patches or breakpoints.
1065 assert(!(iter.type() == relocInfo::breakpoint_type
1066 && iter.breakpoint_reloc()->active()),
1067 "no active breakpoint");
1068 }
1069 }
1072 ScopeDesc* nmethod::scope_desc_at(address pc) {
1073 PcDesc* pd = pc_desc_at(pc);
1074 guarantee(pd != NULL, "scope must be present");
1075 return new ScopeDesc(this, pd->scope_decode_offset(),
1076 pd->obj_decode_offset(), pd->should_reexecute(),
1077 pd->return_oop());
1078 }
1081 void nmethod::clear_inline_caches() {
1082 assert(SafepointSynchronize::is_at_safepoint(), "cleaning of IC's only allowed at safepoint");
1083 if (is_zombie()) {
1084 return;
1085 }
1087 RelocIterator iter(this);
1088 while (iter.next()) {
1089 iter.reloc()->clear_inline_cache();
1090 }
1091 }
1094 void nmethod::cleanup_inline_caches() {
1096 assert_locked_or_safepoint(CompiledIC_lock);
1098 // If the method is not entrant or zombie then a JMP is plastered over the
1099 // first few bytes. If an oop in the old code was there, that oop
1100 // should not get GC'd. Skip the first few bytes of oops on
1101 // not-entrant methods.
1102 address low_boundary = verified_entry_point();
1103 if (!is_in_use()) {
1104 low_boundary += NativeJump::instruction_size;
1105 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1106 // This means that the low_boundary is going to be a little too high.
1107 // This shouldn't matter, since oops of non-entrant methods are never used.
1108 // In fact, why are we bothering to look at oops in a non-entrant method??
1109 }
1111 // Find all calls in an nmethod, and clear the ones that points to zombie methods
1112 ResourceMark rm;
1113 RelocIterator iter(this, low_boundary);
1114 while(iter.next()) {
1115 switch(iter.type()) {
1116 case relocInfo::virtual_call_type:
1117 case relocInfo::opt_virtual_call_type: {
1118 CompiledIC *ic = CompiledIC_at(iter.reloc());
1119 // Ok, to lookup references to zombies here
1120 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
1121 if( cb != NULL && cb->is_nmethod() ) {
1122 nmethod* nm = (nmethod*)cb;
1123 // Clean inline caches pointing to both zombie and not_entrant methods
1124 if (!nm->is_in_use() || (nm->method()->code() != nm)) ic->set_to_clean();
1125 }
1126 break;
1127 }
1128 case relocInfo::static_call_type: {
1129 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
1130 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
1131 if( cb != NULL && cb->is_nmethod() ) {
1132 nmethod* nm = (nmethod*)cb;
1133 // Clean inline caches pointing to both zombie and not_entrant methods
1134 if (!nm->is_in_use() || (nm->method()->code() != nm)) csc->set_to_clean();
1135 }
1136 break;
1137 }
1138 }
1139 }
1140 }
1142 // This is a private interface with the sweeper.
1143 void nmethod::mark_as_seen_on_stack() {
1144 assert(is_not_entrant(), "must be a non-entrant method");
1145 set_stack_traversal_mark(NMethodSweeper::traversal_count());
1146 }
1148 // Tell if a non-entrant method can be converted to a zombie (i.e., there is no activations on the stack)
1149 bool nmethod::can_not_entrant_be_converted() {
1150 assert(is_not_entrant(), "must be a non-entrant method");
1152 // Since the nmethod sweeper only does partial sweep the sweeper's traversal
1153 // count can be greater than the stack traversal count before it hits the
1154 // nmethod for the second time.
1155 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count();
1156 }
1158 void nmethod::inc_decompile_count() {
1159 // Could be gated by ProfileTraps, but do not bother...
1160 methodOop m = method();
1161 if (m == NULL) return;
1162 methodDataOop mdo = m->method_data();
1163 if (mdo == NULL) return;
1164 // There is a benign race here. See comments in methodDataOop.hpp.
1165 mdo->inc_decompile_count();
1166 }
1168 void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) {
1170 post_compiled_method_unload();
1172 // Since this nmethod is being unloaded, make sure that dependencies
1173 // recorded in instanceKlasses get flushed and pass non-NULL closure to
1174 // indicate that this work is being done during a GC.
1175 assert(Universe::heap()->is_gc_active(), "should only be called during gc");
1176 assert(is_alive != NULL, "Should be non-NULL");
1177 // A non-NULL is_alive closure indicates that this is being called during GC.
1178 flush_dependencies(is_alive);
1180 // Break cycle between nmethod & method
1181 if (TraceClassUnloading && WizardMode) {
1182 tty->print_cr("[Class unloading: Making nmethod " INTPTR_FORMAT
1183 " unloadable], methodOop(" INTPTR_FORMAT
1184 "), cause(" INTPTR_FORMAT ")",
1185 this, (address)_method, (address)cause);
1186 if (!Universe::heap()->is_gc_active())
1187 cause->klass()->print();
1188 }
1189 // Unlink the osr method, so we do not look this up again
1190 if (is_osr_method()) {
1191 invalidate_osr_method();
1192 }
1193 // If _method is already NULL the methodOop is about to be unloaded,
1194 // so we don't have to break the cycle. Note that it is possible to
1195 // have the methodOop live here, in case we unload the nmethod because
1196 // it is pointing to some oop (other than the methodOop) being unloaded.
1197 if (_method != NULL) {
1198 // OSR methods point to the methodOop, but the methodOop does not
1199 // point back!
1200 if (_method->code() == this) {
1201 _method->clear_code(); // Break a cycle
1202 }
1203 _method = NULL; // Clear the method of this dead nmethod
1204 }
1205 // Make the class unloaded - i.e., change state and notify sweeper
1206 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
1207 if (is_in_use()) {
1208 // Transitioning directly from live to unloaded -- so
1209 // we need to force a cache clean-up; remember this
1210 // for later on.
1211 CodeCache::set_needs_cache_clean(true);
1212 }
1213 flags.state = unloaded;
1215 // Log the unloading.
1216 log_state_change();
1218 // The methodOop is gone at this point
1219 assert(_method == NULL, "Tautology");
1221 set_osr_link(NULL);
1222 //set_scavenge_root_link(NULL); // done by prune_scavenge_root_nmethods
1223 NMethodSweeper::notify(this);
1224 }
1226 void nmethod::invalidate_osr_method() {
1227 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
1228 // Remove from list of active nmethods
1229 if (method() != NULL)
1230 instanceKlass::cast(method()->method_holder())->remove_osr_nmethod(this);
1231 // Set entry as invalid
1232 _entry_bci = InvalidOSREntryBci;
1233 }
1235 void nmethod::log_state_change() const {
1236 if (LogCompilation) {
1237 if (xtty != NULL) {
1238 ttyLocker ttyl; // keep the following output all in one block
1239 if (flags.state == unloaded) {
1240 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'",
1241 os::current_thread_id());
1242 } else {
1243 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s",
1244 os::current_thread_id(),
1245 (flags.state == zombie ? " zombie='1'" : ""));
1246 }
1247 log_identity(xtty);
1248 xtty->stamp();
1249 xtty->end_elem();
1250 }
1251 }
1252 if (PrintCompilation && flags.state != unloaded) {
1253 print_on(tty, flags.state == zombie ? "made zombie " : "made not entrant ");
1254 tty->cr();
1255 }
1256 }
1258 // Common functionality for both make_not_entrant and make_zombie
1259 bool nmethod::make_not_entrant_or_zombie(unsigned int state) {
1260 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant");
1262 bool was_alive = false;
1264 // Make sure the nmethod is not flushed in case of a safepoint in code below.
1265 nmethodLocker nml(this);
1267 {
1268 // If the method is already zombie there is nothing to do
1269 if (is_zombie()) {
1270 return false;
1271 }
1273 // invalidate osr nmethod before acquiring the patching lock since
1274 // they both acquire leaf locks and we don't want a deadlock.
1275 // This logic is equivalent to the logic below for patching the
1276 // verified entry point of regular methods.
1277 if (is_osr_method()) {
1278 // this effectively makes the osr nmethod not entrant
1279 invalidate_osr_method();
1280 }
1282 // Enter critical section. Does not block for safepoint.
1283 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1285 if (flags.state == state) {
1286 // another thread already performed this transition so nothing
1287 // to do, but return false to indicate this.
1288 return false;
1289 }
1291 // The caller can be calling the method statically or through an inline
1292 // cache call.
1293 if (!is_osr_method() && !is_not_entrant()) {
1294 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
1295 SharedRuntime::get_handle_wrong_method_stub());
1296 assert (NativeJump::instruction_size == nmethod::_zombie_instruction_size, "");
1297 }
1299 was_alive = is_in_use(); // Read state under lock
1301 // Change state
1302 flags.state = state;
1304 // Log the transition once
1305 log_state_change();
1307 } // leave critical region under Patching_lock
1309 // When the nmethod becomes zombie it is no longer alive so the
1310 // dependencies must be flushed. nmethods in the not_entrant
1311 // state will be flushed later when the transition to zombie
1312 // happens or they get unloaded.
1313 if (state == zombie) {
1314 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1315 flush_dependencies(NULL);
1316 } else {
1317 assert(state == not_entrant, "other cases may need to be handled differently");
1318 }
1320 if (state == not_entrant) {
1321 Events::log("Make nmethod not entrant " INTPTR_FORMAT, this);
1322 } else {
1323 Events::log("Make nmethod zombie " INTPTR_FORMAT, this);
1324 }
1326 if (TraceCreateZombies) {
1327 tty->print_cr("nmethod <" INTPTR_FORMAT "> code made %s", this, (state == not_entrant) ? "not entrant" : "zombie");
1328 }
1330 // Make sweeper aware that there is a zombie method that needs to be removed
1331 NMethodSweeper::notify(this);
1333 // not_entrant only stuff
1334 if (state == not_entrant) {
1335 mark_as_seen_on_stack();
1336 }
1338 if (was_alive) {
1339 // It's a true state change, so mark the method as decompiled.
1340 // Do it only for transition from alive.
1341 inc_decompile_count();
1342 }
1344 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload event
1345 // and it hasn't already been reported for this nmethod then report it now.
1346 // (the event may have been reported earilier if the GC marked it for unloading).
1347 if (state == zombie) {
1348 post_compiled_method_unload();
1349 }
1352 // Zombie only stuff
1353 if (state == zombie) {
1354 VTune::delete_nmethod(this);
1355 }
1357 // Check whether method got unloaded at a safepoint before this,
1358 // if so we can skip the flushing steps below
1359 if (method() == NULL) return true;
1361 // Remove nmethod from method.
1362 // We need to check if both the _code and _from_compiled_code_entry_point
1363 // refer to this nmethod because there is a race in setting these two fields
1364 // in methodOop as seen in bugid 4947125.
1365 // If the vep() points to the zombie nmethod, the memory for the nmethod
1366 // could be flushed and the compiler and vtable stubs could still call
1367 // through it.
1368 if (method()->code() == this ||
1369 method()->from_compiled_entry() == verified_entry_point()) {
1370 HandleMark hm;
1371 method()->clear_code();
1372 }
1374 return true;
1375 }
1377 void nmethod::flush() {
1378 // Note that there are no valid oops in the nmethod anymore.
1379 assert(is_zombie() || (is_osr_method() && is_unloaded()), "must be a zombie method");
1380 assert(is_marked_for_reclamation() || (is_osr_method() && is_unloaded()), "must be marked for reclamation");
1382 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed");
1383 assert_locked_or_safepoint(CodeCache_lock);
1385 // completely deallocate this method
1386 EventMark m("flushing nmethod " INTPTR_FORMAT " %s", this, "");
1387 if (PrintMethodFlushing) {
1388 tty->print_cr("*flushing nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT "/Free CodeCache:" SIZE_FORMAT "Kb",
1389 _compile_id, this, CodeCache::nof_blobs(), CodeCache::unallocated_capacity()/1024);
1390 }
1392 // We need to deallocate any ExceptionCache data.
1393 // Note that we do not need to grab the nmethod lock for this, it
1394 // better be thread safe if we're disposing of it!
1395 ExceptionCache* ec = exception_cache();
1396 set_exception_cache(NULL);
1397 while(ec != NULL) {
1398 ExceptionCache* next = ec->next();
1399 delete ec;
1400 ec = next;
1401 }
1403 if (on_scavenge_root_list()) {
1404 CodeCache::drop_scavenge_root_nmethod(this);
1405 }
1407 if (is_speculatively_disconnected()) {
1408 CodeCache::remove_saved_code(this);
1409 }
1411 ((CodeBlob*)(this))->flush();
1413 CodeCache::free(this);
1414 }
1417 //
1418 // Notify all classes this nmethod is dependent on that it is no
1419 // longer dependent. This should only be called in two situations.
1420 // First, when a nmethod transitions to a zombie all dependents need
1421 // to be clear. Since zombification happens at a safepoint there's no
1422 // synchronization issues. The second place is a little more tricky.
1423 // During phase 1 of mark sweep class unloading may happen and as a
1424 // result some nmethods may get unloaded. In this case the flushing
1425 // of dependencies must happen during phase 1 since after GC any
1426 // dependencies in the unloaded nmethod won't be updated, so
1427 // traversing the dependency information in unsafe. In that case this
1428 // function is called with a non-NULL argument and this function only
1429 // notifies instanceKlasses that are reachable
1431 void nmethod::flush_dependencies(BoolObjectClosure* is_alive) {
1432 assert_locked_or_safepoint(CodeCache_lock);
1433 assert(Universe::heap()->is_gc_active() == (is_alive != NULL),
1434 "is_alive is non-NULL if and only if we are called during GC");
1435 if (!has_flushed_dependencies()) {
1436 set_has_flushed_dependencies();
1437 for (Dependencies::DepStream deps(this); deps.next(); ) {
1438 klassOop klass = deps.context_type();
1439 if (klass == NULL) continue; // ignore things like evol_method
1441 // During GC the is_alive closure is non-NULL, and is used to
1442 // determine liveness of dependees that need to be updated.
1443 if (is_alive == NULL || is_alive->do_object_b(klass)) {
1444 instanceKlass::cast(klass)->remove_dependent_nmethod(this);
1445 }
1446 }
1447 }
1448 }
1451 // If this oop is not live, the nmethod can be unloaded.
1452 bool nmethod::can_unload(BoolObjectClosure* is_alive,
1453 OopClosure* keep_alive,
1454 oop* root, bool unloading_occurred) {
1455 assert(root != NULL, "just checking");
1456 oop obj = *root;
1457 if (obj == NULL || is_alive->do_object_b(obj)) {
1458 return false;
1459 }
1460 if (obj->is_compiledICHolder()) {
1461 compiledICHolderOop cichk_oop = compiledICHolderOop(obj);
1462 if (is_alive->do_object_b(
1463 cichk_oop->holder_method()->method_holder()) &&
1464 is_alive->do_object_b(cichk_oop->holder_klass())) {
1465 // The oop should be kept alive
1466 keep_alive->do_oop(root);
1467 return false;
1468 }
1469 }
1470 // If ScavengeRootsInCode is true, an nmethod might be unloaded
1471 // simply because one of its constant oops has gone dead.
1472 // No actual classes need to be unloaded in order for this to occur.
1473 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading");
1474 make_unloaded(is_alive, obj);
1475 return true;
1476 }
1478 // ------------------------------------------------------------------
1479 // post_compiled_method_load_event
1480 // new method for install_code() path
1481 // Transfer information from compilation to jvmti
1482 void nmethod::post_compiled_method_load_event() {
1484 methodOop moop = method();
1485 HS_DTRACE_PROBE8(hotspot, compiled__method__load,
1486 moop->klass_name()->bytes(),
1487 moop->klass_name()->utf8_length(),
1488 moop->name()->bytes(),
1489 moop->name()->utf8_length(),
1490 moop->signature()->bytes(),
1491 moop->signature()->utf8_length(),
1492 code_begin(), code_size());
1494 if (JvmtiExport::should_post_compiled_method_load() ||
1495 JvmtiExport::should_post_compiled_method_unload()) {
1496 get_and_cache_jmethod_id();
1497 }
1499 if (JvmtiExport::should_post_compiled_method_load()) {
1500 JvmtiExport::post_compiled_method_load(this);
1501 }
1502 }
1504 jmethodID nmethod::get_and_cache_jmethod_id() {
1505 if (_jmethod_id == NULL) {
1506 // Cache the jmethod_id since it can no longer be looked up once the
1507 // method itself has been marked for unloading.
1508 _jmethod_id = method()->jmethod_id();
1509 }
1510 return _jmethod_id;
1511 }
1513 void nmethod::post_compiled_method_unload() {
1514 if (unload_reported()) {
1515 // During unloading we transition to unloaded and then to zombie
1516 // and the unloading is reported during the first transition.
1517 return;
1518 }
1520 assert(_method != NULL && !is_unloaded(), "just checking");
1521 DTRACE_METHOD_UNLOAD_PROBE(method());
1523 // If a JVMTI agent has enabled the CompiledMethodUnload event then
1524 // post the event. Sometime later this nmethod will be made a zombie
1525 // by the sweeper but the methodOop will not be valid at that point.
1526 // If the _jmethod_id is null then no load event was ever requested
1527 // so don't bother posting the unload. The main reason for this is
1528 // that the jmethodID is a weak reference to the methodOop so if
1529 // it's being unloaded there's no way to look it up since the weak
1530 // ref will have been cleared.
1531 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) {
1532 assert(!unload_reported(), "already unloaded");
1533 HandleMark hm;
1534 JvmtiExport::post_compiled_method_unload(_jmethod_id, code_begin());
1535 }
1537 // The JVMTI CompiledMethodUnload event can be enabled or disabled at
1538 // any time. As the nmethod is being unloaded now we mark it has
1539 // having the unload event reported - this will ensure that we don't
1540 // attempt to report the event in the unlikely scenario where the
1541 // event is enabled at the time the nmethod is made a zombie.
1542 set_unload_reported();
1543 }
1545 // This is called at the end of the strong tracing/marking phase of a
1546 // GC to unload an nmethod if it contains otherwise unreachable
1547 // oops.
1549 void nmethod::do_unloading(BoolObjectClosure* is_alive,
1550 OopClosure* keep_alive, bool unloading_occurred) {
1551 // Make sure the oop's ready to receive visitors
1552 assert(!is_zombie() && !is_unloaded(),
1553 "should not call follow on zombie or unloaded nmethod");
1555 // If the method is not entrant then a JMP is plastered over the
1556 // first few bytes. If an oop in the old code was there, that oop
1557 // should not get GC'd. Skip the first few bytes of oops on
1558 // not-entrant methods.
1559 address low_boundary = verified_entry_point();
1560 if (is_not_entrant()) {
1561 low_boundary += NativeJump::instruction_size;
1562 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1563 // (See comment above.)
1564 }
1566 // The RedefineClasses() API can cause the class unloading invariant
1567 // to no longer be true. See jvmtiExport.hpp for details.
1568 // Also, leave a debugging breadcrumb in local flag.
1569 bool a_class_was_redefined = JvmtiExport::has_redefined_a_class();
1570 if (a_class_was_redefined) {
1571 // This set of the unloading_occurred flag is done before the
1572 // call to post_compiled_method_unload() so that the unloading
1573 // of this nmethod is reported.
1574 unloading_occurred = true;
1575 }
1577 // Follow methodOop
1578 if (can_unload(is_alive, keep_alive, (oop*)&_method, unloading_occurred)) {
1579 return;
1580 }
1582 // Exception cache
1583 ExceptionCache* ec = exception_cache();
1584 while (ec != NULL) {
1585 oop* ex_addr = (oop*)ec->exception_type_addr();
1586 oop ex = *ex_addr;
1587 ExceptionCache* next_ec = ec->next();
1588 if (ex != NULL && !is_alive->do_object_b(ex)) {
1589 assert(!ex->is_compiledICHolder(), "Possible error here");
1590 remove_from_exception_cache(ec);
1591 }
1592 ec = next_ec;
1593 }
1595 // If class unloading occurred we first iterate over all inline caches and
1596 // clear ICs where the cached oop is referring to an unloaded klass or method.
1597 // The remaining live cached oops will be traversed in the relocInfo::oop_type
1598 // iteration below.
1599 if (unloading_occurred) {
1600 RelocIterator iter(this, low_boundary);
1601 while(iter.next()) {
1602 if (iter.type() == relocInfo::virtual_call_type) {
1603 CompiledIC *ic = CompiledIC_at(iter.reloc());
1604 oop ic_oop = ic->cached_oop();
1605 if (ic_oop != NULL && !is_alive->do_object_b(ic_oop)) {
1606 // The only exception is compiledICHolder oops which may
1607 // yet be marked below. (We check this further below).
1608 if (ic_oop->is_compiledICHolder()) {
1609 compiledICHolderOop cichk_oop = compiledICHolderOop(ic_oop);
1610 if (is_alive->do_object_b(
1611 cichk_oop->holder_method()->method_holder()) &&
1612 is_alive->do_object_b(cichk_oop->holder_klass())) {
1613 continue;
1614 }
1615 }
1616 ic->set_to_clean();
1617 assert(ic->cached_oop() == NULL,
1618 "cached oop in IC should be cleared");
1619 }
1620 }
1621 }
1622 }
1624 // Compiled code
1625 RelocIterator iter(this, low_boundary);
1626 while (iter.next()) {
1627 if (iter.type() == relocInfo::oop_type) {
1628 oop_Relocation* r = iter.oop_reloc();
1629 // In this loop, we must only traverse those oops directly embedded in
1630 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1631 assert(1 == (r->oop_is_immediate()) +
1632 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1633 "oop must be found in exactly one place");
1634 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1635 if (can_unload(is_alive, keep_alive, r->oop_addr(), unloading_occurred)) {
1636 return;
1637 }
1638 }
1639 }
1640 }
1643 // Scopes
1644 for (oop* p = oops_begin(); p < oops_end(); p++) {
1645 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1646 if (can_unload(is_alive, keep_alive, p, unloading_occurred)) {
1647 return;
1648 }
1649 }
1651 #ifndef PRODUCT
1652 // This nmethod was not unloaded; check below that all CompiledICs
1653 // refer to marked oops.
1654 {
1655 RelocIterator iter(this, low_boundary);
1656 while (iter.next()) {
1657 if (iter.type() == relocInfo::virtual_call_type) {
1658 CompiledIC *ic = CompiledIC_at(iter.reloc());
1659 oop ic_oop = ic->cached_oop();
1660 assert(ic_oop == NULL || is_alive->do_object_b(ic_oop),
1661 "Found unmarked ic_oop in reachable nmethod");
1662 }
1663 }
1664 }
1665 #endif // !PRODUCT
1666 }
1668 // This method is called twice during GC -- once while
1669 // tracing the "active" nmethods on thread stacks during
1670 // the (strong) marking phase, and then again when walking
1671 // the code cache contents during the weak roots processing
1672 // phase. The two uses are distinguished by means of the
1673 // 'do_strong_roots_only' flag, which is true in the first
1674 // case. We want to walk the weak roots in the nmethod
1675 // only in the second case. The weak roots in the nmethod
1676 // are the oops in the ExceptionCache and the InlineCache
1677 // oops.
1678 void nmethod::oops_do(OopClosure* f, bool do_strong_roots_only) {
1679 // make sure the oops ready to receive visitors
1680 assert(!is_zombie() && !is_unloaded(),
1681 "should not call follow on zombie or unloaded nmethod");
1683 // If the method is not entrant or zombie then a JMP is plastered over the
1684 // first few bytes. If an oop in the old code was there, that oop
1685 // should not get GC'd. Skip the first few bytes of oops on
1686 // not-entrant methods.
1687 address low_boundary = verified_entry_point();
1688 if (is_not_entrant()) {
1689 low_boundary += NativeJump::instruction_size;
1690 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1691 // (See comment above.)
1692 }
1694 // Compiled code
1695 f->do_oop((oop*) &_method);
1696 if (!do_strong_roots_only) {
1697 // weak roots processing phase -- update ExceptionCache oops
1698 ExceptionCache* ec = exception_cache();
1699 while(ec != NULL) {
1700 f->do_oop((oop*)ec->exception_type_addr());
1701 ec = ec->next();
1702 }
1703 } // Else strong roots phase -- skip oops in ExceptionCache
1705 RelocIterator iter(this, low_boundary);
1707 while (iter.next()) {
1708 if (iter.type() == relocInfo::oop_type ) {
1709 oop_Relocation* r = iter.oop_reloc();
1710 // In this loop, we must only follow those oops directly embedded in
1711 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1712 assert(1 == (r->oop_is_immediate()) +
1713 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1714 "oop must be found in exactly one place");
1715 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1716 f->do_oop(r->oop_addr());
1717 }
1718 }
1719 }
1721 // Scopes
1722 // This includes oop constants not inlined in the code stream.
1723 for (oop* p = oops_begin(); p < oops_end(); p++) {
1724 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1725 f->do_oop(p);
1726 }
1727 }
1729 #define NMETHOD_SENTINEL ((nmethod*)badAddress)
1731 nmethod* volatile nmethod::_oops_do_mark_nmethods;
1733 // An nmethod is "marked" if its _mark_link is set non-null.
1734 // Even if it is the end of the linked list, it will have a non-null link value,
1735 // as long as it is on the list.
1736 // This code must be MP safe, because it is used from parallel GC passes.
1737 bool nmethod::test_set_oops_do_mark() {
1738 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");
1739 nmethod* observed_mark_link = _oops_do_mark_link;
1740 if (observed_mark_link == NULL) {
1741 // Claim this nmethod for this thread to mark.
1742 observed_mark_link = (nmethod*)
1743 Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_link, NULL);
1744 if (observed_mark_link == NULL) {
1746 // Atomically append this nmethod (now claimed) to the head of the list:
1747 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods;
1748 for (;;) {
1749 nmethod* required_mark_nmethods = observed_mark_nmethods;
1750 _oops_do_mark_link = required_mark_nmethods;
1751 observed_mark_nmethods = (nmethod*)
1752 Atomic::cmpxchg_ptr(this, &_oops_do_mark_nmethods, required_mark_nmethods);
1753 if (observed_mark_nmethods == required_mark_nmethods)
1754 break;
1755 }
1756 // Mark was clear when we first saw this guy.
1757 NOT_PRODUCT(if (TraceScavenge) print_on(tty, "oops_do, mark\n"));
1758 return false;
1759 }
1760 }
1761 // On fall through, another racing thread marked this nmethod before we did.
1762 return true;
1763 }
1765 void nmethod::oops_do_marking_prologue() {
1766 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("[oops_do_marking_prologue"));
1767 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row");
1768 // We use cmpxchg_ptr instead of regular assignment here because the user
1769 // may fork a bunch of threads, and we need them all to see the same state.
1770 void* observed = Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, NULL);
1771 guarantee(observed == NULL, "no races in this sequential code");
1772 }
1774 void nmethod::oops_do_marking_epilogue() {
1775 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row");
1776 nmethod* cur = _oops_do_mark_nmethods;
1777 while (cur != NMETHOD_SENTINEL) {
1778 assert(cur != NULL, "not NULL-terminated");
1779 nmethod* next = cur->_oops_do_mark_link;
1780 cur->_oops_do_mark_link = NULL;
1781 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark\n"));
1782 cur = next;
1783 }
1784 void* required = _oops_do_mark_nmethods;
1785 void* observed = Atomic::cmpxchg_ptr(NULL, &_oops_do_mark_nmethods, required);
1786 guarantee(observed == required, "no races in this sequential code");
1787 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("oops_do_marking_epilogue]"));
1788 }
1790 class DetectScavengeRoot: public OopClosure {
1791 bool _detected_scavenge_root;
1792 public:
1793 DetectScavengeRoot() : _detected_scavenge_root(false)
1794 { NOT_PRODUCT(_print_nm = NULL); }
1795 bool detected_scavenge_root() { return _detected_scavenge_root; }
1796 virtual void do_oop(oop* p) {
1797 if ((*p) != NULL && (*p)->is_scavengable()) {
1798 NOT_PRODUCT(maybe_print(p));
1799 _detected_scavenge_root = true;
1800 }
1801 }
1802 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
1804 #ifndef PRODUCT
1805 nmethod* _print_nm;
1806 void maybe_print(oop* p) {
1807 if (_print_nm == NULL) return;
1808 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root");
1809 tty->print_cr(""PTR_FORMAT"[offset=%d] detected non-perm oop "PTR_FORMAT" (found at "PTR_FORMAT")",
1810 _print_nm, (int)((intptr_t)p - (intptr_t)_print_nm),
1811 (intptr_t)(*p), (intptr_t)p);
1812 (*p)->print();
1813 }
1814 #endif //PRODUCT
1815 };
1817 bool nmethod::detect_scavenge_root_oops() {
1818 DetectScavengeRoot detect_scavenge_root;
1819 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this);
1820 oops_do(&detect_scavenge_root);
1821 return detect_scavenge_root.detected_scavenge_root();
1822 }
1824 // Method that knows how to preserve outgoing arguments at call. This method must be
1825 // called with a frame corresponding to a Java invoke
1826 void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) {
1827 if (!method()->is_native()) {
1828 SimpleScopeDesc ssd(this, fr.pc());
1829 Bytecode_invoke* call = Bytecode_invoke_at(ssd.method(), ssd.bci());
1830 bool has_receiver = call->has_receiver();
1831 symbolOop signature = call->signature();
1832 fr.oops_compiled_arguments_do(signature, has_receiver, reg_map, f);
1833 }
1834 }
1837 oop nmethod::embeddedOop_at(u_char* p) {
1838 RelocIterator iter(this, p, p + oopSize);
1839 while (iter.next())
1840 if (iter.type() == relocInfo::oop_type) {
1841 return iter.oop_reloc()->oop_value();
1842 }
1843 return NULL;
1844 }
1847 inline bool includes(void* p, void* from, void* to) {
1848 return from <= p && p < to;
1849 }
1852 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
1853 assert(count >= 2, "must be sentinel values, at least");
1855 #ifdef ASSERT
1856 // must be sorted and unique; we do a binary search in find_pc_desc()
1857 int prev_offset = pcs[0].pc_offset();
1858 assert(prev_offset == PcDesc::lower_offset_limit,
1859 "must start with a sentinel");
1860 for (int i = 1; i < count; i++) {
1861 int this_offset = pcs[i].pc_offset();
1862 assert(this_offset > prev_offset, "offsets must be sorted");
1863 prev_offset = this_offset;
1864 }
1865 assert(prev_offset == PcDesc::upper_offset_limit,
1866 "must end with a sentinel");
1867 #endif //ASSERT
1869 // Search for MethodHandle invokes and tag the nmethod.
1870 for (int i = 0; i < count; i++) {
1871 if (pcs[i].is_method_handle_invoke()) {
1872 set_has_method_handle_invokes(true);
1873 break;
1874 }
1875 }
1877 int size = count * sizeof(PcDesc);
1878 assert(scopes_pcs_size() >= size, "oob");
1879 memcpy(scopes_pcs_begin(), pcs, size);
1881 // Adjust the final sentinel downward.
1882 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
1883 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
1884 last_pc->set_pc_offset(instructions_size() + 1);
1885 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
1886 // Fill any rounding gaps with copies of the last record.
1887 last_pc[1] = last_pc[0];
1888 }
1889 // The following assert could fail if sizeof(PcDesc) is not
1890 // an integral multiple of oopSize (the rounding term).
1891 // If it fails, change the logic to always allocate a multiple
1892 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
1893 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
1894 }
1896 void nmethod::copy_scopes_data(u_char* buffer, int size) {
1897 assert(scopes_data_size() >= size, "oob");
1898 memcpy(scopes_data_begin(), buffer, size);
1899 }
1902 #ifdef ASSERT
1903 static PcDesc* linear_search(nmethod* nm, int pc_offset, bool approximate) {
1904 PcDesc* lower = nm->scopes_pcs_begin();
1905 PcDesc* upper = nm->scopes_pcs_end();
1906 lower += 1; // exclude initial sentinel
1907 PcDesc* res = NULL;
1908 for (PcDesc* p = lower; p < upper; p++) {
1909 NOT_PRODUCT(--nmethod_stats.pc_desc_tests); // don't count this call to match_desc
1910 if (match_desc(p, pc_offset, approximate)) {
1911 if (res == NULL)
1912 res = p;
1913 else
1914 res = (PcDesc*) badAddress;
1915 }
1916 }
1917 return res;
1918 }
1919 #endif
1922 // Finds a PcDesc with real-pc equal to "pc"
1923 PcDesc* nmethod::find_pc_desc_internal(address pc, bool approximate) {
1924 address base_address = instructions_begin();
1925 if ((pc < base_address) ||
1926 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
1927 return NULL; // PC is wildly out of range
1928 }
1929 int pc_offset = (int) (pc - base_address);
1931 // Check the PcDesc cache if it contains the desired PcDesc
1932 // (This as an almost 100% hit rate.)
1933 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
1934 if (res != NULL) {
1935 assert(res == linear_search(this, pc_offset, approximate), "cache ok");
1936 return res;
1937 }
1939 // Fallback algorithm: quasi-linear search for the PcDesc
1940 // Find the last pc_offset less than the given offset.
1941 // The successor must be the required match, if there is a match at all.
1942 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
1943 PcDesc* lower = scopes_pcs_begin();
1944 PcDesc* upper = scopes_pcs_end();
1945 upper -= 1; // exclude final sentinel
1946 if (lower >= upper) return NULL; // native method; no PcDescs at all
1948 #define assert_LU_OK \
1949 /* invariant on lower..upper during the following search: */ \
1950 assert(lower->pc_offset() < pc_offset, "sanity"); \
1951 assert(upper->pc_offset() >= pc_offset, "sanity")
1952 assert_LU_OK;
1954 // Use the last successful return as a split point.
1955 PcDesc* mid = _pc_desc_cache.last_pc_desc();
1956 NOT_PRODUCT(++nmethod_stats.pc_desc_searches);
1957 if (mid->pc_offset() < pc_offset) {
1958 lower = mid;
1959 } else {
1960 upper = mid;
1961 }
1963 // Take giant steps at first (4096, then 256, then 16, then 1)
1964 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
1965 const int RADIX = (1 << LOG2_RADIX);
1966 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
1967 while ((mid = lower + step) < upper) {
1968 assert_LU_OK;
1969 NOT_PRODUCT(++nmethod_stats.pc_desc_searches);
1970 if (mid->pc_offset() < pc_offset) {
1971 lower = mid;
1972 } else {
1973 upper = mid;
1974 break;
1975 }
1976 }
1977 assert_LU_OK;
1978 }
1980 // Sneak up on the value with a linear search of length ~16.
1981 while (true) {
1982 assert_LU_OK;
1983 mid = lower + 1;
1984 NOT_PRODUCT(++nmethod_stats.pc_desc_searches);
1985 if (mid->pc_offset() < pc_offset) {
1986 lower = mid;
1987 } else {
1988 upper = mid;
1989 break;
1990 }
1991 }
1992 #undef assert_LU_OK
1994 if (match_desc(upper, pc_offset, approximate)) {
1995 assert(upper == linear_search(this, pc_offset, approximate), "search ok");
1996 _pc_desc_cache.add_pc_desc(upper);
1997 return upper;
1998 } else {
1999 assert(NULL == linear_search(this, pc_offset, approximate), "search ok");
2000 return NULL;
2001 }
2002 }
2005 bool nmethod::check_all_dependencies() {
2006 bool found_check = false;
2007 // wholesale check of all dependencies
2008 for (Dependencies::DepStream deps(this); deps.next(); ) {
2009 if (deps.check_dependency() != NULL) {
2010 found_check = true;
2011 NOT_DEBUG(break);
2012 }
2013 }
2014 return found_check; // tell caller if we found anything
2015 }
2017 bool nmethod::check_dependency_on(DepChange& changes) {
2018 // What has happened:
2019 // 1) a new class dependee has been added
2020 // 2) dependee and all its super classes have been marked
2021 bool found_check = false; // set true if we are upset
2022 for (Dependencies::DepStream deps(this); deps.next(); ) {
2023 // Evaluate only relevant dependencies.
2024 if (deps.spot_check_dependency_at(changes) != NULL) {
2025 found_check = true;
2026 NOT_DEBUG(break);
2027 }
2028 }
2029 return found_check;
2030 }
2032 bool nmethod::is_evol_dependent_on(klassOop dependee) {
2033 instanceKlass *dependee_ik = instanceKlass::cast(dependee);
2034 objArrayOop dependee_methods = dependee_ik->methods();
2035 for (Dependencies::DepStream deps(this); deps.next(); ) {
2036 if (deps.type() == Dependencies::evol_method) {
2037 methodOop method = deps.method_argument(0);
2038 for (int j = 0; j < dependee_methods->length(); j++) {
2039 if ((methodOop) dependee_methods->obj_at(j) == method) {
2040 // RC_TRACE macro has an embedded ResourceMark
2041 RC_TRACE(0x01000000,
2042 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)",
2043 _method->method_holder()->klass_part()->external_name(),
2044 _method->name()->as_C_string(),
2045 _method->signature()->as_C_string(), compile_id(),
2046 method->method_holder()->klass_part()->external_name(),
2047 method->name()->as_C_string(),
2048 method->signature()->as_C_string()));
2049 if (TraceDependencies || LogCompilation)
2050 deps.log_dependency(dependee);
2051 return true;
2052 }
2053 }
2054 }
2055 }
2056 return false;
2057 }
2059 // Called from mark_for_deoptimization, when dependee is invalidated.
2060 bool nmethod::is_dependent_on_method(methodOop dependee) {
2061 for (Dependencies::DepStream deps(this); deps.next(); ) {
2062 if (deps.type() != Dependencies::evol_method)
2063 continue;
2064 methodOop method = deps.method_argument(0);
2065 if (method == dependee) return true;
2066 }
2067 return false;
2068 }
2071 bool nmethod::is_patchable_at(address instr_addr) {
2072 assert (code_contains(instr_addr), "wrong nmethod used");
2073 if (is_zombie()) {
2074 // a zombie may never be patched
2075 return false;
2076 }
2077 return true;
2078 }
2081 address nmethod::continuation_for_implicit_exception(address pc) {
2082 // Exception happened outside inline-cache check code => we are inside
2083 // an active nmethod => use cpc to determine a return address
2084 int exception_offset = pc - instructions_begin();
2085 int cont_offset = ImplicitExceptionTable(this).at( exception_offset );
2086 #ifdef ASSERT
2087 if (cont_offset == 0) {
2088 Thread* thread = ThreadLocalStorage::get_thread_slow();
2089 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
2090 HandleMark hm(thread);
2091 ResourceMark rm(thread);
2092 CodeBlob* cb = CodeCache::find_blob(pc);
2093 assert(cb != NULL && cb == this, "");
2094 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, pc);
2095 print();
2096 method()->print_codes();
2097 print_code();
2098 print_pcs();
2099 }
2100 #endif
2101 if (cont_offset == 0) {
2102 // Let the normal error handling report the exception
2103 return NULL;
2104 }
2105 return instructions_begin() + cont_offset;
2106 }
2110 void nmethod_init() {
2111 // make sure you didn't forget to adjust the filler fields
2112 assert(sizeof(nmFlags) <= 4, "nmFlags occupies more than a word");
2113 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
2114 }
2117 //-------------------------------------------------------------------------------------------
2120 // QQQ might we make this work from a frame??
2121 nmethodLocker::nmethodLocker(address pc) {
2122 CodeBlob* cb = CodeCache::find_blob(pc);
2123 guarantee(cb != NULL && cb->is_nmethod(), "bad pc for a nmethod found");
2124 _nm = (nmethod*)cb;
2125 lock_nmethod(_nm);
2126 }
2128 void nmethodLocker::lock_nmethod(nmethod* nm) {
2129 if (nm == NULL) return;
2130 Atomic::inc(&nm->_lock_count);
2131 guarantee(!nm->is_zombie(), "cannot lock a zombie method");
2132 }
2134 void nmethodLocker::unlock_nmethod(nmethod* nm) {
2135 if (nm == NULL) return;
2136 Atomic::dec(&nm->_lock_count);
2137 guarantee(nm->_lock_count >= 0, "unmatched nmethod lock/unlock");
2138 }
2141 // -----------------------------------------------------------------------------
2142 // nmethod::get_deopt_original_pc
2143 //
2144 // Return the original PC for the given PC if:
2145 // (a) the given PC belongs to a nmethod and
2146 // (b) it is a deopt PC
2147 address nmethod::get_deopt_original_pc(const frame* fr) {
2148 if (fr->cb() == NULL) return NULL;
2150 nmethod* nm = fr->cb()->as_nmethod_or_null();
2151 if (nm != NULL && nm->is_deopt_pc(fr->pc()))
2152 return nm->get_original_pc(fr);
2154 return NULL;
2155 }
2158 // -----------------------------------------------------------------------------
2159 // MethodHandle
2161 bool nmethod::is_method_handle_return(address return_pc) {
2162 if (!has_method_handle_invokes()) return false;
2163 PcDesc* pd = pc_desc_at(return_pc);
2164 if (pd == NULL)
2165 return false;
2166 return pd->is_method_handle_invoke();
2167 }
2170 // -----------------------------------------------------------------------------
2171 // Verification
2173 class VerifyOopsClosure: public OopClosure {
2174 nmethod* _nm;
2175 bool _ok;
2176 public:
2177 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
2178 bool ok() { return _ok; }
2179 virtual void do_oop(oop* p) {
2180 if ((*p) == NULL || (*p)->is_oop()) return;
2181 if (_ok) {
2182 _nm->print_nmethod(true);
2183 _ok = false;
2184 }
2185 tty->print_cr("*** non-oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)",
2186 (intptr_t)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm));
2187 }
2188 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2189 };
2191 void nmethod::verify() {
2193 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant
2194 // seems odd.
2196 if( is_zombie() || is_not_entrant() )
2197 return;
2199 // Make sure all the entry points are correctly aligned for patching.
2200 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
2202 assert(method()->is_oop(), "must be valid");
2204 ResourceMark rm;
2206 if (!CodeCache::contains(this)) {
2207 fatal(err_msg("nmethod at " INTPTR_FORMAT " not in zone", this));
2208 }
2210 if(is_native_method() )
2211 return;
2213 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
2214 if (nm != this) {
2215 fatal(err_msg("findNMethod did not find this nmethod (" INTPTR_FORMAT ")",
2216 this));
2217 }
2219 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2220 if (! p->verify(this)) {
2221 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", this);
2222 }
2223 }
2225 VerifyOopsClosure voc(this);
2226 oops_do(&voc);
2227 assert(voc.ok(), "embedded oops must be OK");
2228 verify_scavenge_root_oops();
2230 verify_scopes();
2231 }
2234 void nmethod::verify_interrupt_point(address call_site) {
2235 // This code does not work in release mode since
2236 // owns_lock only is available in debug mode.
2237 CompiledIC* ic = NULL;
2238 Thread *cur = Thread::current();
2239 if (CompiledIC_lock->owner() == cur ||
2240 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) &&
2241 SafepointSynchronize::is_at_safepoint())) {
2242 ic = CompiledIC_at(call_site);
2243 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
2244 } else {
2245 MutexLocker ml_verify (CompiledIC_lock);
2246 ic = CompiledIC_at(call_site);
2247 }
2248 PcDesc* pd = pc_desc_at(ic->end_of_call());
2249 assert(pd != NULL, "PcDesc must exist");
2250 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(),
2251 pd->obj_decode_offset(), pd->should_reexecute(),
2252 pd->return_oop());
2253 !sd->is_top(); sd = sd->sender()) {
2254 sd->verify();
2255 }
2256 }
2258 void nmethod::verify_scopes() {
2259 if( !method() ) return; // Runtime stubs have no scope
2260 if (method()->is_native()) return; // Ignore stub methods.
2261 // iterate through all interrupt point
2262 // and verify the debug information is valid.
2263 RelocIterator iter((nmethod*)this);
2264 while (iter.next()) {
2265 address stub = NULL;
2266 switch (iter.type()) {
2267 case relocInfo::virtual_call_type:
2268 verify_interrupt_point(iter.addr());
2269 break;
2270 case relocInfo::opt_virtual_call_type:
2271 stub = iter.opt_virtual_call_reloc()->static_stub();
2272 verify_interrupt_point(iter.addr());
2273 break;
2274 case relocInfo::static_call_type:
2275 stub = iter.static_call_reloc()->static_stub();
2276 //verify_interrupt_point(iter.addr());
2277 break;
2278 case relocInfo::runtime_call_type:
2279 address destination = iter.reloc()->value();
2280 // Right now there is no way to find out which entries support
2281 // an interrupt point. It would be nice if we had this
2282 // information in a table.
2283 break;
2284 }
2285 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section");
2286 }
2287 }
2290 // -----------------------------------------------------------------------------
2291 // Non-product code
2292 #ifndef PRODUCT
2294 class DebugScavengeRoot: public OopClosure {
2295 nmethod* _nm;
2296 bool _ok;
2297 public:
2298 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { }
2299 bool ok() { return _ok; }
2300 virtual void do_oop(oop* p) {
2301 if ((*p) == NULL || !(*p)->is_scavengable()) return;
2302 if (_ok) {
2303 _nm->print_nmethod(true);
2304 _ok = false;
2305 }
2306 tty->print_cr("*** non-perm oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)",
2307 (intptr_t)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm));
2308 (*p)->print();
2309 }
2310 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2311 };
2313 void nmethod::verify_scavenge_root_oops() {
2314 if (!on_scavenge_root_list()) {
2315 // Actually look inside, to verify the claim that it's clean.
2316 DebugScavengeRoot debug_scavenge_root(this);
2317 oops_do(&debug_scavenge_root);
2318 if (!debug_scavenge_root.ok())
2319 fatal("found an unadvertised bad non-perm oop in the code cache");
2320 }
2321 assert(scavenge_root_not_marked(), "");
2322 }
2324 #endif // PRODUCT
2326 // Printing operations
2328 void nmethod::print() const {
2329 ResourceMark rm;
2330 ttyLocker ttyl; // keep the following output all in one block
2332 tty->print("Compiled ");
2334 if (is_compiled_by_c1()) {
2335 tty->print("(c1) ");
2336 } else if (is_compiled_by_c2()) {
2337 tty->print("(c2) ");
2338 } else {
2339 tty->print("(nm) ");
2340 }
2342 print_on(tty, "nmethod");
2343 tty->cr();
2344 if (WizardMode) {
2345 tty->print("((nmethod*) "INTPTR_FORMAT ") ", this);
2346 tty->print(" for method " INTPTR_FORMAT , (address)method());
2347 tty->print(" { ");
2348 if (version()) tty->print("v%d ", version());
2349 if (is_in_use()) tty->print("in_use ");
2350 if (is_not_entrant()) tty->print("not_entrant ");
2351 if (is_zombie()) tty->print("zombie ");
2352 if (is_unloaded()) tty->print("unloaded ");
2353 if (on_scavenge_root_list()) tty->print("scavenge_root ");
2354 tty->print_cr("}:");
2355 }
2356 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2357 (address)this,
2358 (address)this + size(),
2359 size());
2360 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2361 relocation_begin(),
2362 relocation_end(),
2363 relocation_size());
2364 if (code_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2365 code_begin(),
2366 code_end(),
2367 code_size());
2368 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2369 stub_begin(),
2370 stub_end(),
2371 stub_size());
2372 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2373 consts_begin(),
2374 consts_end(),
2375 consts_size());
2376 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2377 oops_begin(),
2378 oops_end(),
2379 oops_size());
2380 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2381 scopes_data_begin(),
2382 scopes_data_end(),
2383 scopes_data_size());
2384 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2385 scopes_pcs_begin(),
2386 scopes_pcs_end(),
2387 scopes_pcs_size());
2388 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2389 dependencies_begin(),
2390 dependencies_end(),
2391 dependencies_size());
2392 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2393 handler_table_begin(),
2394 handler_table_end(),
2395 handler_table_size());
2396 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2397 nul_chk_table_begin(),
2398 nul_chk_table_end(),
2399 nul_chk_table_size());
2400 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2401 oops_begin(),
2402 oops_end(),
2403 oops_size());
2404 }
2406 void nmethod::print_code() {
2407 HandleMark hm;
2408 ResourceMark m;
2409 Disassembler::decode(this);
2410 }
2413 #ifndef PRODUCT
2415 void nmethod::print_scopes() {
2416 // Find the first pc desc for all scopes in the code and print it.
2417 ResourceMark rm;
2418 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2419 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
2420 continue;
2422 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
2423 sd->print_on(tty, p);
2424 }
2425 }
2427 void nmethod::print_dependencies() {
2428 ResourceMark rm;
2429 ttyLocker ttyl; // keep the following output all in one block
2430 tty->print_cr("Dependencies:");
2431 for (Dependencies::DepStream deps(this); deps.next(); ) {
2432 deps.print_dependency();
2433 klassOop ctxk = deps.context_type();
2434 if (ctxk != NULL) {
2435 Klass* k = Klass::cast(ctxk);
2436 if (k->oop_is_instance() && ((instanceKlass*)k)->is_dependent_nmethod(this)) {
2437 tty->print_cr(" [nmethod<=klass]%s", k->external_name());
2438 }
2439 }
2440 deps.log_dependency(); // put it into the xml log also
2441 }
2442 }
2445 void nmethod::print_relocations() {
2446 ResourceMark m; // in case methods get printed via the debugger
2447 tty->print_cr("relocations:");
2448 RelocIterator iter(this);
2449 iter.print();
2450 if (UseRelocIndex) {
2451 jint* index_end = (jint*)relocation_end() - 1;
2452 jint index_size = *index_end;
2453 jint* index_start = (jint*)( (address)index_end - index_size );
2454 tty->print_cr(" index @" INTPTR_FORMAT ": index_size=%d", index_start, index_size);
2455 if (index_size > 0) {
2456 jint* ip;
2457 for (ip = index_start; ip+2 <= index_end; ip += 2)
2458 tty->print_cr(" (%d %d) addr=" INTPTR_FORMAT " @" INTPTR_FORMAT,
2459 ip[0],
2460 ip[1],
2461 header_end()+ip[0],
2462 relocation_begin()-1+ip[1]);
2463 for (; ip < index_end; ip++)
2464 tty->print_cr(" (%d ?)", ip[0]);
2465 tty->print_cr(" @" INTPTR_FORMAT ": index_size=%d", ip, *ip++);
2466 tty->print_cr("reloc_end @" INTPTR_FORMAT ":", ip);
2467 }
2468 }
2469 }
2472 void nmethod::print_pcs() {
2473 ResourceMark m; // in case methods get printed via debugger
2474 tty->print_cr("pc-bytecode offsets:");
2475 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2476 p->print(this);
2477 }
2478 }
2480 #endif // PRODUCT
2482 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
2483 RelocIterator iter(this, begin, end);
2484 bool have_one = false;
2485 while (iter.next()) {
2486 have_one = true;
2487 switch (iter.type()) {
2488 case relocInfo::none: return "no_reloc";
2489 case relocInfo::oop_type: {
2490 stringStream st;
2491 oop_Relocation* r = iter.oop_reloc();
2492 oop obj = r->oop_value();
2493 st.print("oop(");
2494 if (obj == NULL) st.print("NULL");
2495 else obj->print_value_on(&st);
2496 st.print(")");
2497 return st.as_string();
2498 }
2499 case relocInfo::virtual_call_type: return "virtual_call";
2500 case relocInfo::opt_virtual_call_type: return "optimized virtual_call";
2501 case relocInfo::static_call_type: return "static_call";
2502 case relocInfo::static_stub_type: return "static_stub";
2503 case relocInfo::runtime_call_type: return "runtime_call";
2504 case relocInfo::external_word_type: return "external_word";
2505 case relocInfo::internal_word_type: return "internal_word";
2506 case relocInfo::section_word_type: return "section_word";
2507 case relocInfo::poll_type: return "poll";
2508 case relocInfo::poll_return_type: return "poll_return";
2509 case relocInfo::type_mask: return "type_bit_mask";
2510 }
2511 }
2512 return have_one ? "other" : NULL;
2513 }
2515 // Return a the last scope in (begin..end]
2516 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
2517 PcDesc* p = pc_desc_near(begin+1);
2518 if (p != NULL && p->real_pc(this) <= end) {
2519 return new ScopeDesc(this, p->scope_decode_offset(),
2520 p->obj_decode_offset(), p->should_reexecute(),
2521 p->return_oop());
2522 }
2523 return NULL;
2524 }
2526 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) {
2527 if (block_begin == entry_point()) stream->print_cr("[Entry Point]");
2528 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]");
2529 if (block_begin == exception_begin()) stream->print_cr("[Exception Handler]");
2530 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]");
2531 if (block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]");
2532 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]");
2533 if (block_begin == consts_begin()) stream->print_cr("[Constants]");
2534 if (block_begin == entry_point()) {
2535 methodHandle m = method();
2536 if (m.not_null()) {
2537 stream->print(" # ");
2538 m->print_value_on(stream);
2539 stream->cr();
2540 }
2541 if (m.not_null() && !is_osr_method()) {
2542 ResourceMark rm;
2543 int sizeargs = m->size_of_parameters();
2544 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
2545 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
2546 {
2547 int sig_index = 0;
2548 if (!m->is_static())
2549 sig_bt[sig_index++] = T_OBJECT; // 'this'
2550 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) {
2551 BasicType t = ss.type();
2552 sig_bt[sig_index++] = t;
2553 if (type2size[t] == 2) {
2554 sig_bt[sig_index++] = T_VOID;
2555 } else {
2556 assert(type2size[t] == 1, "size is 1 or 2");
2557 }
2558 }
2559 assert(sig_index == sizeargs, "");
2560 }
2561 const char* spname = "sp"; // make arch-specific?
2562 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false);
2563 int stack_slot_offset = this->frame_size() * wordSize;
2564 int tab1 = 14, tab2 = 24;
2565 int sig_index = 0;
2566 int arg_index = (m->is_static() ? 0 : -1);
2567 bool did_old_sp = false;
2568 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) {
2569 bool at_this = (arg_index == -1);
2570 bool at_old_sp = false;
2571 BasicType t = (at_this ? T_OBJECT : ss.type());
2572 assert(t == sig_bt[sig_index], "sigs in sync");
2573 if (at_this)
2574 stream->print(" # this: ");
2575 else
2576 stream->print(" # parm%d: ", arg_index);
2577 stream->move_to(tab1);
2578 VMReg fst = regs[sig_index].first();
2579 VMReg snd = regs[sig_index].second();
2580 if (fst->is_reg()) {
2581 stream->print("%s", fst->name());
2582 if (snd->is_valid()) {
2583 stream->print(":%s", snd->name());
2584 }
2585 } else if (fst->is_stack()) {
2586 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
2587 if (offset == stack_slot_offset) at_old_sp = true;
2588 stream->print("[%s+0x%x]", spname, offset);
2589 } else {
2590 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
2591 }
2592 stream->print(" ");
2593 stream->move_to(tab2);
2594 stream->print("= ");
2595 if (at_this) {
2596 m->method_holder()->print_value_on(stream);
2597 } else {
2598 bool did_name = false;
2599 if (!at_this && ss.is_object()) {
2600 symbolOop name = ss.as_symbol_or_null();
2601 if (name != NULL) {
2602 name->print_value_on(stream);
2603 did_name = true;
2604 }
2605 }
2606 if (!did_name)
2607 stream->print("%s", type2name(t));
2608 }
2609 if (at_old_sp) {
2610 stream->print(" (%s of caller)", spname);
2611 did_old_sp = true;
2612 }
2613 stream->cr();
2614 sig_index += type2size[t];
2615 arg_index += 1;
2616 if (!at_this) ss.next();
2617 }
2618 if (!did_old_sp) {
2619 stream->print(" # ");
2620 stream->move_to(tab1);
2621 stream->print("[%s+0x%x]", spname, stack_slot_offset);
2622 stream->print(" (%s of caller)", spname);
2623 stream->cr();
2624 }
2625 }
2626 }
2627 }
2629 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) {
2630 // First, find an oopmap in (begin, end].
2631 // We use the odd half-closed interval so that oop maps and scope descs
2632 // which are tied to the byte after a call are printed with the call itself.
2633 address base = instructions_begin();
2634 OopMapSet* oms = oop_maps();
2635 if (oms != NULL) {
2636 for (int i = 0, imax = oms->size(); i < imax; i++) {
2637 OopMap* om = oms->at(i);
2638 address pc = base + om->offset();
2639 if (pc > begin) {
2640 if (pc <= end) {
2641 st->move_to(column);
2642 st->print("; ");
2643 om->print_on(st);
2644 }
2645 break;
2646 }
2647 }
2648 }
2650 // Print any debug info present at this pc.
2651 ScopeDesc* sd = scope_desc_in(begin, end);
2652 if (sd != NULL) {
2653 st->move_to(column);
2654 if (sd->bci() == SynchronizationEntryBCI) {
2655 st->print(";*synchronization entry");
2656 } else {
2657 if (sd->method().is_null()) {
2658 st->print("method is NULL");
2659 } else if (sd->method()->is_native()) {
2660 st->print("method is native");
2661 } else {
2662 address bcp = sd->method()->bcp_from(sd->bci());
2663 Bytecodes::Code bc = Bytecodes::java_code_at(bcp);
2664 st->print(";*%s", Bytecodes::name(bc));
2665 switch (bc) {
2666 case Bytecodes::_invokevirtual:
2667 case Bytecodes::_invokespecial:
2668 case Bytecodes::_invokestatic:
2669 case Bytecodes::_invokeinterface:
2670 {
2671 Bytecode_invoke* invoke = Bytecode_invoke_at(sd->method(), sd->bci());
2672 st->print(" ");
2673 if (invoke->name() != NULL)
2674 invoke->name()->print_symbol_on(st);
2675 else
2676 st->print("<UNKNOWN>");
2677 break;
2678 }
2679 case Bytecodes::_getfield:
2680 case Bytecodes::_putfield:
2681 case Bytecodes::_getstatic:
2682 case Bytecodes::_putstatic:
2683 {
2684 Bytecode_field* field = Bytecode_field_at(sd->method(), sd->bci());
2685 st->print(" ");
2686 if (field->name() != NULL)
2687 field->name()->print_symbol_on(st);
2688 else
2689 st->print("<UNKNOWN>");
2690 }
2691 }
2692 }
2693 }
2695 // Print all scopes
2696 for (;sd != NULL; sd = sd->sender()) {
2697 st->move_to(column);
2698 st->print("; -");
2699 if (sd->method().is_null()) {
2700 st->print("method is NULL");
2701 } else {
2702 sd->method()->print_short_name(st);
2703 }
2704 int lineno = sd->method()->line_number_from_bci(sd->bci());
2705 if (lineno != -1) {
2706 st->print("@%d (line %d)", sd->bci(), lineno);
2707 } else {
2708 st->print("@%d", sd->bci());
2709 }
2710 st->cr();
2711 }
2712 }
2714 // Print relocation information
2715 const char* str = reloc_string_for(begin, end);
2716 if (str != NULL) {
2717 if (sd != NULL) st->cr();
2718 st->move_to(column);
2719 st->print("; {%s}", str);
2720 }
2721 int cont_offset = ImplicitExceptionTable(this).at(begin - instructions_begin());
2722 if (cont_offset != 0) {
2723 st->move_to(column);
2724 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, instructions_begin() + cont_offset);
2725 }
2727 }
2729 #ifndef PRODUCT
2731 void nmethod::print_value_on(outputStream* st) const {
2732 print_on(st, "nmethod");
2733 }
2735 void nmethod::print_calls(outputStream* st) {
2736 RelocIterator iter(this);
2737 while (iter.next()) {
2738 switch (iter.type()) {
2739 case relocInfo::virtual_call_type:
2740 case relocInfo::opt_virtual_call_type: {
2741 VerifyMutexLocker mc(CompiledIC_lock);
2742 CompiledIC_at(iter.reloc())->print();
2743 break;
2744 }
2745 case relocInfo::static_call_type:
2746 st->print_cr("Static call at " INTPTR_FORMAT, iter.reloc()->addr());
2747 compiledStaticCall_at(iter.reloc())->print();
2748 break;
2749 }
2750 }
2751 }
2753 void nmethod::print_handler_table() {
2754 ExceptionHandlerTable(this).print();
2755 }
2757 void nmethod::print_nul_chk_table() {
2758 ImplicitExceptionTable(this).print(instructions_begin());
2759 }
2761 void nmethod::print_statistics() {
2762 ttyLocker ttyl;
2763 if (xtty != NULL) xtty->head("statistics type='nmethod'");
2764 nmethod_stats.print_native_nmethod_stats();
2765 nmethod_stats.print_nmethod_stats();
2766 DebugInformationRecorder::print_statistics();
2767 nmethod_stats.print_pc_stats();
2768 Dependencies::print_statistics();
2769 if (xtty != NULL) xtty->tail("statistics");
2770 }
2772 #endif // PRODUCT