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rev 1024 : imported patch indy-cleanup-6893081.patch
rev 1026 : imported patch indy.compiler.inline.patch
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--- old/src/share/vm/code/nmethod.cpp
+++ new/src/share/vm/code/nmethod.cpp
1 1 /*
2 2 * Copyright 1997-2009 Sun Microsystems, Inc. All Rights Reserved.
3 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 4 *
5 5 * This code is free software; you can redistribute it and/or modify it
6 6 * under the terms of the GNU General Public License version 2 only, as
7 7 * published by the Free Software Foundation.
8 8 *
9 9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 12 * version 2 for more details (a copy is included in the LICENSE file that
13 13 * accompanied this code).
14 14 *
15 15 * You should have received a copy of the GNU General Public License version
16 16 * 2 along with this work; if not, write to the Free Software Foundation,
17 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 18 *
19 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 21 * have any questions.
22 22 *
23 23 */
24 24
25 25 # include "incls/_precompiled.incl"
26 26 # include "incls/_nmethod.cpp.incl"
27 27
28 28 #ifdef DTRACE_ENABLED
29 29
30 30 // Only bother with this argument setup if dtrace is available
31 31
32 32 HS_DTRACE_PROBE_DECL8(hotspot, compiled__method__load,
33 33 const char*, int, const char*, int, const char*, int, void*, size_t);
34 34
35 35 HS_DTRACE_PROBE_DECL6(hotspot, compiled__method__unload,
36 36 char*, int, char*, int, char*, int);
37 37
38 38 #define DTRACE_METHOD_UNLOAD_PROBE(method) \
39 39 { \
40 40 methodOop m = (method); \
41 41 if (m != NULL) { \
42 42 symbolOop klass_name = m->klass_name(); \
43 43 symbolOop name = m->name(); \
44 44 symbolOop signature = m->signature(); \
45 45 HS_DTRACE_PROBE6(hotspot, compiled__method__unload, \
46 46 klass_name->bytes(), klass_name->utf8_length(), \
47 47 name->bytes(), name->utf8_length(), \
48 48 signature->bytes(), signature->utf8_length()); \
49 49 } \
50 50 }
51 51
52 52 #else // ndef DTRACE_ENABLED
53 53
54 54 #define DTRACE_METHOD_UNLOAD_PROBE(method)
55 55
56 56 #endif
57 57
58 58 bool nmethod::is_compiled_by_c1() const {
59 59 if (is_native_method()) return false;
60 60 assert(compiler() != NULL, "must be");
61 61 return compiler()->is_c1();
62 62 }
63 63 bool nmethod::is_compiled_by_c2() const {
64 64 if (is_native_method()) return false;
65 65 assert(compiler() != NULL, "must be");
66 66 return compiler()->is_c2();
67 67 }
68 68
69 69
70 70
71 71 //---------------------------------------------------------------------------------
72 72 // NMethod statistics
73 73 // They are printed under various flags, including:
74 74 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation.
75 75 // (In the latter two cases, they like other stats are printed to the log only.)
76 76
77 77 #ifndef PRODUCT
78 78 // These variables are put into one block to reduce relocations
79 79 // and make it simpler to print from the debugger.
80 80 static
81 81 struct nmethod_stats_struct {
82 82 int nmethod_count;
83 83 int total_size;
84 84 int relocation_size;
85 85 int code_size;
86 86 int stub_size;
87 87 int consts_size;
88 88 int scopes_data_size;
89 89 int scopes_pcs_size;
90 90 int dependencies_size;
91 91 int handler_table_size;
92 92 int nul_chk_table_size;
93 93 int oops_size;
94 94
95 95 void note_nmethod(nmethod* nm) {
96 96 nmethod_count += 1;
97 97 total_size += nm->size();
98 98 relocation_size += nm->relocation_size();
99 99 code_size += nm->code_size();
100 100 stub_size += nm->stub_size();
101 101 consts_size += nm->consts_size();
102 102 scopes_data_size += nm->scopes_data_size();
103 103 scopes_pcs_size += nm->scopes_pcs_size();
104 104 dependencies_size += nm->dependencies_size();
105 105 handler_table_size += nm->handler_table_size();
106 106 nul_chk_table_size += nm->nul_chk_table_size();
107 107 oops_size += nm->oops_size();
108 108 }
109 109 void print_nmethod_stats() {
110 110 if (nmethod_count == 0) return;
111 111 tty->print_cr("Statistics for %d bytecoded nmethods:", nmethod_count);
112 112 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size);
113 113 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size);
114 114 if (code_size != 0) tty->print_cr(" main code = %d", code_size);
115 115 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size);
116 116 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size);
117 117 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size);
118 118 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size);
119 119 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size);
120 120 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size);
121 121 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size);
122 122 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size);
123 123 }
124 124
125 125 int native_nmethod_count;
126 126 int native_total_size;
127 127 int native_relocation_size;
128 128 int native_code_size;
129 129 int native_oops_size;
130 130 void note_native_nmethod(nmethod* nm) {
131 131 native_nmethod_count += 1;
132 132 native_total_size += nm->size();
133 133 native_relocation_size += nm->relocation_size();
134 134 native_code_size += nm->code_size();
135 135 native_oops_size += nm->oops_size();
136 136 }
137 137 void print_native_nmethod_stats() {
138 138 if (native_nmethod_count == 0) return;
139 139 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count);
140 140 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size);
141 141 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size);
142 142 if (native_code_size != 0) tty->print_cr(" N. main code = %d", native_code_size);
143 143 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size);
144 144 }
145 145
146 146 int pc_desc_resets; // number of resets (= number of caches)
147 147 int pc_desc_queries; // queries to nmethod::find_pc_desc
148 148 int pc_desc_approx; // number of those which have approximate true
149 149 int pc_desc_repeats; // number of _last_pc_desc hits
150 150 int pc_desc_hits; // number of LRU cache hits
151 151 int pc_desc_tests; // total number of PcDesc examinations
152 152 int pc_desc_searches; // total number of quasi-binary search steps
153 153 int pc_desc_adds; // number of LUR cache insertions
154 154
155 155 void print_pc_stats() {
156 156 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query",
157 157 pc_desc_queries,
158 158 (double)(pc_desc_tests + pc_desc_searches)
159 159 / pc_desc_queries);
160 160 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d",
161 161 pc_desc_resets,
162 162 pc_desc_queries, pc_desc_approx,
163 163 pc_desc_repeats, pc_desc_hits,
164 164 pc_desc_tests, pc_desc_searches, pc_desc_adds);
165 165 }
166 166 } nmethod_stats;
167 167 #endif //PRODUCT
168 168
169 169 //---------------------------------------------------------------------------------
170 170
171 171
172 172 // The _unwind_handler is a special marker address, which says that
173 173 // for given exception oop and address, the frame should be removed
174 174 // as the tuple cannot be caught in the nmethod
175 175 address ExceptionCache::_unwind_handler = (address) -1;
176 176
177 177
178 178 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) {
179 179 assert(pc != NULL, "Must be non null");
180 180 assert(exception.not_null(), "Must be non null");
181 181 assert(handler != NULL, "Must be non null");
182 182
183 183 _count = 0;
184 184 _exception_type = exception->klass();
185 185 _next = NULL;
186 186
187 187 add_address_and_handler(pc,handler);
188 188 }
189 189
190 190
191 191 address ExceptionCache::match(Handle exception, address pc) {
192 192 assert(pc != NULL,"Must be non null");
193 193 assert(exception.not_null(),"Must be non null");
194 194 if (exception->klass() == exception_type()) {
195 195 return (test_address(pc));
196 196 }
197 197
198 198 return NULL;
199 199 }
200 200
201 201
202 202 bool ExceptionCache::match_exception_with_space(Handle exception) {
203 203 assert(exception.not_null(),"Must be non null");
204 204 if (exception->klass() == exception_type() && count() < cache_size) {
205 205 return true;
206 206 }
207 207 return false;
208 208 }
209 209
210 210
211 211 address ExceptionCache::test_address(address addr) {
212 212 for (int i=0; i<count(); i++) {
213 213 if (pc_at(i) == addr) {
214 214 return handler_at(i);
215 215 }
216 216 }
217 217 return NULL;
218 218 }
219 219
220 220
221 221 bool ExceptionCache::add_address_and_handler(address addr, address handler) {
222 222 if (test_address(addr) == handler) return true;
223 223 if (count() < cache_size) {
224 224 set_pc_at(count(),addr);
225 225 set_handler_at(count(), handler);
226 226 increment_count();
227 227 return true;
228 228 }
229 229 return false;
230 230 }
231 231
232 232
233 233 // private method for handling exception cache
234 234 // These methods are private, and used to manipulate the exception cache
235 235 // directly.
236 236 ExceptionCache* nmethod::exception_cache_entry_for_exception(Handle exception) {
237 237 ExceptionCache* ec = exception_cache();
238 238 while (ec != NULL) {
239 239 if (ec->match_exception_with_space(exception)) {
240 240 return ec;
241 241 }
242 242 ec = ec->next();
243 243 }
244 244 return NULL;
245 245 }
246 246
247 247
248 248 //-----------------------------------------------------------------------------
249 249
250 250
251 251 // Helper used by both find_pc_desc methods.
252 252 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) {
253 253 NOT_PRODUCT(++nmethod_stats.pc_desc_tests);
254 254 if (!approximate)
255 255 return pc->pc_offset() == pc_offset;
256 256 else
257 257 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset();
258 258 }
259 259
260 260 void PcDescCache::reset_to(PcDesc* initial_pc_desc) {
261 261 if (initial_pc_desc == NULL) {
262 262 _last_pc_desc = NULL; // native method
263 263 return;
264 264 }
265 265 NOT_PRODUCT(++nmethod_stats.pc_desc_resets);
266 266 // reset the cache by filling it with benign (non-null) values
267 267 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel");
268 268 _last_pc_desc = initial_pc_desc + 1; // first valid one is after sentinel
269 269 for (int i = 0; i < cache_size; i++)
270 270 _pc_descs[i] = initial_pc_desc;
271 271 }
272 272
273 273 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) {
274 274 NOT_PRODUCT(++nmethod_stats.pc_desc_queries);
275 275 NOT_PRODUCT(if (approximate) ++nmethod_stats.pc_desc_approx);
276 276
277 277 // In order to prevent race conditions do not load cache elements
278 278 // repeatedly, but use a local copy:
279 279 PcDesc* res;
280 280
281 281 // Step one: Check the most recently returned value.
282 282 res = _last_pc_desc;
283 283 if (res == NULL) return NULL; // native method; no PcDescs at all
284 284 if (match_desc(res, pc_offset, approximate)) {
285 285 NOT_PRODUCT(++nmethod_stats.pc_desc_repeats);
286 286 return res;
287 287 }
288 288
289 289 // Step two: Check the LRU cache.
290 290 for (int i = 0; i < cache_size; i++) {
291 291 res = _pc_descs[i];
292 292 if (res->pc_offset() < 0) break; // optimization: skip empty cache
293 293 if (match_desc(res, pc_offset, approximate)) {
294 294 NOT_PRODUCT(++nmethod_stats.pc_desc_hits);
295 295 _last_pc_desc = res; // record this cache hit in case of repeat
296 296 return res;
297 297 }
298 298 }
299 299
300 300 // Report failure.
301 301 return NULL;
302 302 }
303 303
304 304 void PcDescCache::add_pc_desc(PcDesc* pc_desc) {
305 305 NOT_PRODUCT(++nmethod_stats.pc_desc_adds);
306 306 // Update the LRU cache by shifting pc_desc forward:
307 307 for (int i = 0; i < cache_size; i++) {
308 308 PcDesc* next = _pc_descs[i];
309 309 _pc_descs[i] = pc_desc;
310 310 pc_desc = next;
311 311 }
312 312 // Note: Do not update _last_pc_desc. It fronts for the LRU cache.
313 313 }
314 314
315 315 // adjust pcs_size so that it is a multiple of both oopSize and
316 316 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple
317 317 // of oopSize, then 2*sizeof(PcDesc) is)
318 318 static int adjust_pcs_size(int pcs_size) {
319 319 int nsize = round_to(pcs_size, oopSize);
320 320 if ((nsize % sizeof(PcDesc)) != 0) {
321 321 nsize = pcs_size + sizeof(PcDesc);
322 322 }
323 323 assert((nsize % oopSize) == 0, "correct alignment");
324 324 return nsize;
325 325 }
326 326
327 327 //-----------------------------------------------------------------------------
328 328
329 329
330 330 void nmethod::add_exception_cache_entry(ExceptionCache* new_entry) {
331 331 assert(ExceptionCache_lock->owned_by_self(),"Must hold the ExceptionCache_lock");
332 332 assert(new_entry != NULL,"Must be non null");
333 333 assert(new_entry->next() == NULL, "Must be null");
334 334
335 335 if (exception_cache() != NULL) {
336 336 new_entry->set_next(exception_cache());
337 337 }
338 338 set_exception_cache(new_entry);
339 339 }
340 340
341 341 void nmethod::remove_from_exception_cache(ExceptionCache* ec) {
342 342 ExceptionCache* prev = NULL;
343 343 ExceptionCache* curr = exception_cache();
344 344 assert(curr != NULL, "nothing to remove");
345 345 // find the previous and next entry of ec
346 346 while (curr != ec) {
347 347 prev = curr;
348 348 curr = curr->next();
349 349 assert(curr != NULL, "ExceptionCache not found");
350 350 }
351 351 // now: curr == ec
352 352 ExceptionCache* next = curr->next();
353 353 if (prev == NULL) {
354 354 set_exception_cache(next);
355 355 } else {
356 356 prev->set_next(next);
357 357 }
358 358 delete curr;
359 359 }
360 360
361 361
362 362 // public method for accessing the exception cache
363 363 // These are the public access methods.
364 364 address nmethod::handler_for_exception_and_pc(Handle exception, address pc) {
365 365 // We never grab a lock to read the exception cache, so we may
366 366 // have false negatives. This is okay, as it can only happen during
367 367 // the first few exception lookups for a given nmethod.
368 368 ExceptionCache* ec = exception_cache();
369 369 while (ec != NULL) {
370 370 address ret_val;
371 371 if ((ret_val = ec->match(exception,pc)) != NULL) {
372 372 return ret_val;
373 373 }
374 374 ec = ec->next();
375 375 }
376 376 return NULL;
377 377 }
378 378
379 379
380 380 void nmethod::add_handler_for_exception_and_pc(Handle exception, address pc, address handler) {
381 381 // There are potential race conditions during exception cache updates, so we
382 382 // must own the ExceptionCache_lock before doing ANY modifications. Because
383 383 // we don't lock during reads, it is possible to have several threads attempt
384 384 // to update the cache with the same data. We need to check for already inserted
385 385 // copies of the current data before adding it.
386 386
387 387 MutexLocker ml(ExceptionCache_lock);
388 388 ExceptionCache* target_entry = exception_cache_entry_for_exception(exception);
389 389
390 390 if (target_entry == NULL || !target_entry->add_address_and_handler(pc,handler)) {
391 391 target_entry = new ExceptionCache(exception,pc,handler);
392 392 add_exception_cache_entry(target_entry);
393 393 }
394 394 }
395 395
396 396
397 397 //-------------end of code for ExceptionCache--------------
398 398
399 399
400 400 void nmFlags::clear() {
401 401 assert(sizeof(nmFlags) == sizeof(int), "using more than one word for nmFlags");
402 402 *(jint*)this = 0;
403 403 }
404 404
405 405 int nmethod::total_size() const {
406 406 return
407 407 code_size() +
408 408 stub_size() +
409 409 consts_size() +
410 410 scopes_data_size() +
411 411 scopes_pcs_size() +
412 412 handler_table_size() +
413 413 nul_chk_table_size();
414 414 }
415 415
416 416 const char* nmethod::compile_kind() const {
417 417 if (method() == NULL) return "unloaded";
418 418 if (is_native_method()) return "c2n";
419 419 if (is_osr_method()) return "osr";
420 420 return NULL;
421 421 }
422 422
423 423 // %%% This variable is no longer used?
424 424 int nmethod::_zombie_instruction_size = NativeJump::instruction_size;
425 425
426 426
427 427 nmethod* nmethod::new_native_nmethod(methodHandle method,
428 428 CodeBuffer *code_buffer,
429 429 int vep_offset,
430 430 int frame_complete,
431 431 int frame_size,
432 432 ByteSize basic_lock_owner_sp_offset,
433 433 ByteSize basic_lock_sp_offset,
434 434 OopMapSet* oop_maps) {
435 435 // create nmethod
436 436 nmethod* nm = NULL;
437 437 {
438 438 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
439 439 int native_nmethod_size = allocation_size(code_buffer, sizeof(nmethod));
440 440 CodeOffsets offsets;
441 441 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
442 442 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
443 443 nm = new (native_nmethod_size)
444 444 nmethod(method(), native_nmethod_size, &offsets,
445 445 code_buffer, frame_size,
446 446 basic_lock_owner_sp_offset, basic_lock_sp_offset,
447 447 oop_maps);
448 448 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_native_nmethod(nm));
449 449 if (PrintAssembly && nm != NULL)
450 450 Disassembler::decode(nm);
451 451 }
452 452 // verify nmethod
453 453 debug_only(if (nm) nm->verify();) // might block
454 454
455 455 if (nm != NULL) {
456 456 nm->log_new_nmethod();
457 457 }
458 458
459 459 return nm;
460 460 }
461 461
462 462 #ifdef HAVE_DTRACE_H
463 463 nmethod* nmethod::new_dtrace_nmethod(methodHandle method,
464 464 CodeBuffer *code_buffer,
465 465 int vep_offset,
466 466 int trap_offset,
467 467 int frame_complete,
468 468 int frame_size) {
469 469 // create nmethod
470 470 nmethod* nm = NULL;
471 471 {
472 472 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
473 473 int nmethod_size = allocation_size(code_buffer, sizeof(nmethod));
474 474 CodeOffsets offsets;
475 475 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
476 476 offsets.set_value(CodeOffsets::Dtrace_trap, trap_offset);
477 477 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
478 478
479 479 nm = new (nmethod_size) nmethod(method(), nmethod_size, &offsets, code_buffer, frame_size);
480 480
481 481 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_nmethod(nm));
482 482 if (PrintAssembly && nm != NULL)
483 483 Disassembler::decode(nm);
484 484 }
485 485 // verify nmethod
486 486 debug_only(if (nm) nm->verify();) // might block
487 487
488 488 if (nm != NULL) {
489 489 nm->log_new_nmethod();
490 490 }
491 491
492 492 return nm;
493 493 }
494 494
495 495 #endif // def HAVE_DTRACE_H
496 496
497 497 nmethod* nmethod::new_nmethod(methodHandle method,
498 498 int compile_id,
499 499 int entry_bci,
500 500 CodeOffsets* offsets,
501 501 int orig_pc_offset,
502 502 DebugInformationRecorder* debug_info,
503 503 Dependencies* dependencies,
504 504 CodeBuffer* code_buffer, int frame_size,
505 505 OopMapSet* oop_maps,
506 506 ExceptionHandlerTable* handler_table,
507 507 ImplicitExceptionTable* nul_chk_table,
508 508 AbstractCompiler* compiler,
509 509 int comp_level
510 510 )
511 511 {
512 512 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
513 513 // create nmethod
514 514 nmethod* nm = NULL;
515 515 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
516 516 int nmethod_size =
517 517 allocation_size(code_buffer, sizeof(nmethod))
518 518 + adjust_pcs_size(debug_info->pcs_size())
519 519 + round_to(dependencies->size_in_bytes() , oopSize)
520 520 + round_to(handler_table->size_in_bytes(), oopSize)
521 521 + round_to(nul_chk_table->size_in_bytes(), oopSize)
522 522 + round_to(debug_info->data_size() , oopSize);
523 523 nm = new (nmethod_size)
524 524 nmethod(method(), nmethod_size, compile_id, entry_bci, offsets,
525 525 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size,
526 526 oop_maps,
527 527 handler_table,
528 528 nul_chk_table,
529 529 compiler,
530 530 comp_level);
531 531 if (nm != NULL) {
532 532 // To make dependency checking during class loading fast, record
533 533 // the nmethod dependencies in the classes it is dependent on.
534 534 // This allows the dependency checking code to simply walk the
535 535 // class hierarchy above the loaded class, checking only nmethods
536 536 // which are dependent on those classes. The slow way is to
537 537 // check every nmethod for dependencies which makes it linear in
538 538 // the number of methods compiled. For applications with a lot
539 539 // classes the slow way is too slow.
540 540 for (Dependencies::DepStream deps(nm); deps.next(); ) {
541 541 klassOop klass = deps.context_type();
542 542 if (klass == NULL) continue; // ignore things like evol_method
543 543
544 544 // record this nmethod as dependent on this klass
545 545 instanceKlass::cast(klass)->add_dependent_nmethod(nm);
546 546 }
547 547 }
548 548 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_nmethod(nm));
549 549 if (PrintAssembly && nm != NULL)
550 550 Disassembler::decode(nm);
551 551 }
552 552
553 553 // verify nmethod
554 554 debug_only(if (nm) nm->verify();) // might block
555 555
556 556 if (nm != NULL) {
557 557 nm->log_new_nmethod();
558 558 }
559 559
560 560 // done
561 561 return nm;
562 562 }
563 563
564 564
565 565 // For native wrappers
566 566 nmethod::nmethod(
567 567 methodOop method,
568 568 int nmethod_size,
569 569 CodeOffsets* offsets,
570 570 CodeBuffer* code_buffer,
571 571 int frame_size,
572 572 ByteSize basic_lock_owner_sp_offset,
573 573 ByteSize basic_lock_sp_offset,
574 574 OopMapSet* oop_maps )
575 575 : CodeBlob("native nmethod", code_buffer, sizeof(nmethod),
576 576 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps),
577 577 _compiled_synchronized_native_basic_lock_owner_sp_offset(basic_lock_owner_sp_offset),
578 578 _compiled_synchronized_native_basic_lock_sp_offset(basic_lock_sp_offset)
579 579 {
580 580 {
581 581 debug_only(No_Safepoint_Verifier nsv;)
582 582 assert_locked_or_safepoint(CodeCache_lock);
583 583
584 584 NOT_PRODUCT(_has_debug_info = false);
585 585 _oops_do_mark_link = NULL;
586 586 _method = method;
587 587 _entry_bci = InvocationEntryBci;
588 588 _osr_link = NULL;
589 589 _scavenge_root_link = NULL;
590 590 _scavenge_root_state = 0;
591 591 _compiler = NULL;
592 592 // We have no exception handler or deopt handler make the
593 593 // values something that will never match a pc like the nmethod vtable entry
594 594 _exception_offset = 0;
595 595 _deoptimize_offset = 0;
596 596 _orig_pc_offset = 0;
597 597 #ifdef HAVE_DTRACE_H
598 598 _trap_offset = 0;
599 599 #endif // def HAVE_DTRACE_H
600 600 _stub_offset = data_offset();
601 601 _consts_offset = data_offset();
602 602 _scopes_data_offset = data_offset();
603 603 _scopes_pcs_offset = _scopes_data_offset;
604 604 _dependencies_offset = _scopes_pcs_offset;
605 605 _handler_table_offset = _dependencies_offset;
606 606 _nul_chk_table_offset = _handler_table_offset;
607 607 _nmethod_end_offset = _nul_chk_table_offset;
608 608 _compile_id = 0; // default
609 609 _comp_level = CompLevel_none;
610 610 _entry_point = instructions_begin();
611 611 _verified_entry_point = instructions_begin() + offsets->value(CodeOffsets::Verified_Entry);
612 612 _osr_entry_point = NULL;
613 613 _exception_cache = NULL;
614 614 _pc_desc_cache.reset_to(NULL);
615 615
616 616 flags.clear();
617 617 flags.state = alive;
618 618 _markedForDeoptimization = 0;
619 619
620 620 _lock_count = 0;
621 621 _stack_traversal_mark = 0;
622 622
623 623 code_buffer->copy_oops_to(this);
624 624 debug_only(verify_scavenge_root_oops());
625 625 CodeCache::commit(this);
626 626 VTune::create_nmethod(this);
627 627 }
628 628
629 629 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
630 630 ttyLocker ttyl; // keep the following output all in one block
631 631 // This output goes directly to the tty, not the compiler log.
632 632 // To enable tools to match it up with the compilation activity,
633 633 // be sure to tag this tty output with the compile ID.
634 634 if (xtty != NULL) {
635 635 xtty->begin_head("print_native_nmethod");
636 636 xtty->method(_method);
637 637 xtty->stamp();
638 638 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
639 639 }
640 640 // print the header part first
641 641 print();
642 642 // then print the requested information
643 643 if (PrintNativeNMethods) {
644 644 print_code();
645 645 oop_maps->print();
646 646 }
647 647 if (PrintRelocations) {
648 648 print_relocations();
649 649 }
650 650 if (xtty != NULL) {
651 651 xtty->tail("print_native_nmethod");
652 652 }
653 653 }
654 654 Events::log("Create nmethod " INTPTR_FORMAT, this);
655 655 }
656 656
657 657 // For dtrace wrappers
658 658 #ifdef HAVE_DTRACE_H
659 659 nmethod::nmethod(
660 660 methodOop method,
661 661 int nmethod_size,
662 662 CodeOffsets* offsets,
663 663 CodeBuffer* code_buffer,
664 664 int frame_size)
665 665 : CodeBlob("dtrace nmethod", code_buffer, sizeof(nmethod),
666 666 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, NULL),
667 667 _compiled_synchronized_native_basic_lock_owner_sp_offset(in_ByteSize(-1)),
668 668 _compiled_synchronized_native_basic_lock_sp_offset(in_ByteSize(-1))
669 669 {
670 670 {
671 671 debug_only(No_Safepoint_Verifier nsv;)
672 672 assert_locked_or_safepoint(CodeCache_lock);
673 673
674 674 NOT_PRODUCT(_has_debug_info = false);
675 675 _oops_do_mark_link = NULL;
676 676 _method = method;
677 677 _entry_bci = InvocationEntryBci;
678 678 _osr_link = NULL;
679 679 _scavenge_root_link = NULL;
680 680 _scavenge_root_state = 0;
681 681 _compiler = NULL;
682 682 // We have no exception handler or deopt handler make the
683 683 // values something that will never match a pc like the nmethod vtable entry
684 684 _exception_offset = 0;
685 685 _deoptimize_offset = 0;
686 686 _trap_offset = offsets->value(CodeOffsets::Dtrace_trap);
687 687 _orig_pc_offset = 0;
688 688 _stub_offset = data_offset();
689 689 _consts_offset = data_offset();
690 690 _scopes_data_offset = data_offset();
691 691 _scopes_pcs_offset = _scopes_data_offset;
692 692 _dependencies_offset = _scopes_pcs_offset;
693 693 _handler_table_offset = _dependencies_offset;
694 694 _nul_chk_table_offset = _handler_table_offset;
695 695 _nmethod_end_offset = _nul_chk_table_offset;
696 696 _compile_id = 0; // default
697 697 _comp_level = CompLevel_none;
698 698 _entry_point = instructions_begin();
699 699 _verified_entry_point = instructions_begin() + offsets->value(CodeOffsets::Verified_Entry);
700 700 _osr_entry_point = NULL;
701 701 _exception_cache = NULL;
702 702 _pc_desc_cache.reset_to(NULL);
703 703
704 704 flags.clear();
705 705 flags.state = alive;
706 706 _markedForDeoptimization = 0;
707 707
708 708 _lock_count = 0;
709 709 _stack_traversal_mark = 0;
710 710
711 711 code_buffer->copy_oops_to(this);
712 712 debug_only(verify_scavenge_root_oops());
713 713 CodeCache::commit(this);
714 714 VTune::create_nmethod(this);
715 715 }
716 716
717 717 if (PrintNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
718 718 ttyLocker ttyl; // keep the following output all in one block
719 719 // This output goes directly to the tty, not the compiler log.
720 720 // To enable tools to match it up with the compilation activity,
721 721 // be sure to tag this tty output with the compile ID.
722 722 if (xtty != NULL) {
723 723 xtty->begin_head("print_dtrace_nmethod");
724 724 xtty->method(_method);
725 725 xtty->stamp();
726 726 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
727 727 }
728 728 // print the header part first
729 729 print();
730 730 // then print the requested information
731 731 if (PrintNMethods) {
732 732 print_code();
733 733 }
734 734 if (PrintRelocations) {
735 735 print_relocations();
736 736 }
737 737 if (xtty != NULL) {
738 738 xtty->tail("print_dtrace_nmethod");
739 739 }
740 740 }
741 741 Events::log("Create nmethod " INTPTR_FORMAT, this);
742 742 }
743 743 #endif // def HAVE_DTRACE_H
744 744
745 745 void* nmethod::operator new(size_t size, int nmethod_size) {
746 746 // Always leave some room in the CodeCache for I2C/C2I adapters
747 747 if (CodeCache::unallocated_capacity() < CodeCacheMinimumFreeSpace) return NULL;
748 748 return CodeCache::allocate(nmethod_size);
749 749 }
750 750
751 751
752 752 nmethod::nmethod(
753 753 methodOop method,
754 754 int nmethod_size,
755 755 int compile_id,
756 756 int entry_bci,
757 757 CodeOffsets* offsets,
758 758 int orig_pc_offset,
759 759 DebugInformationRecorder* debug_info,
760 760 Dependencies* dependencies,
761 761 CodeBuffer *code_buffer,
762 762 int frame_size,
763 763 OopMapSet* oop_maps,
764 764 ExceptionHandlerTable* handler_table,
765 765 ImplicitExceptionTable* nul_chk_table,
766 766 AbstractCompiler* compiler,
767 767 int comp_level
768 768 )
769 769 : CodeBlob("nmethod", code_buffer, sizeof(nmethod),
770 770 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps),
771 771 _compiled_synchronized_native_basic_lock_owner_sp_offset(in_ByteSize(-1)),
772 772 _compiled_synchronized_native_basic_lock_sp_offset(in_ByteSize(-1))
773 773 {
774 774 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
775 775 {
776 776 debug_only(No_Safepoint_Verifier nsv;)
777 777 assert_locked_or_safepoint(CodeCache_lock);
778 778
779 779 NOT_PRODUCT(_has_debug_info = false);
780 780 _oops_do_mark_link = NULL;
781 781 _method = method;
782 782 _compile_id = compile_id;
783 783 _comp_level = comp_level;
784 784 _entry_bci = entry_bci;
785 785 _osr_link = NULL;
786 786 _scavenge_root_link = NULL;
787 787 _scavenge_root_state = 0;
788 788 _compiler = compiler;
789 789 _orig_pc_offset = orig_pc_offset;
790 790 #ifdef HAVE_DTRACE_H
791 791 _trap_offset = 0;
792 792 #endif // def HAVE_DTRACE_H
793 793 _stub_offset = instructions_offset() + code_buffer->total_offset_of(code_buffer->stubs()->start());
794 794
795 795 // Exception handler and deopt handler are in the stub section
796 796 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
797 797 _deoptimize_offset = _stub_offset + offsets->value(CodeOffsets::Deopt);
798 798 _consts_offset = instructions_offset() + code_buffer->total_offset_of(code_buffer->consts()->start());
799 799 _scopes_data_offset = data_offset();
800 800 _scopes_pcs_offset = _scopes_data_offset + round_to(debug_info->data_size (), oopSize);
801 801 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
802 802 _handler_table_offset = _dependencies_offset + round_to(dependencies->size_in_bytes (), oopSize);
803 803 _nul_chk_table_offset = _handler_table_offset + round_to(handler_table->size_in_bytes(), oopSize);
804 804 _nmethod_end_offset = _nul_chk_table_offset + round_to(nul_chk_table->size_in_bytes(), oopSize);
805 805
806 806 _entry_point = instructions_begin();
807 807 _verified_entry_point = instructions_begin() + offsets->value(CodeOffsets::Verified_Entry);
808 808 _osr_entry_point = instructions_begin() + offsets->value(CodeOffsets::OSR_Entry);
809 809 _exception_cache = NULL;
810 810 _pc_desc_cache.reset_to(scopes_pcs_begin());
811 811
812 812 flags.clear();
813 813 flags.state = alive;
814 814 _markedForDeoptimization = 0;
815 815
816 816 _unload_reported = false; // jvmti state
817 817
818 818 _lock_count = 0;
819 819 _stack_traversal_mark = 0;
820 820
821 821 // Copy contents of ScopeDescRecorder to nmethod
822 822 code_buffer->copy_oops_to(this);
823 823 debug_info->copy_to(this);
824 824 dependencies->copy_to(this);
825 825 if (ScavengeRootsInCode && detect_scavenge_root_oops()) {
826 826 CodeCache::add_scavenge_root_nmethod(this);
827 827 }
828 828 debug_only(verify_scavenge_root_oops());
829 829
830 830 CodeCache::commit(this);
831 831
832 832 VTune::create_nmethod(this);
833 833
834 834 // Copy contents of ExceptionHandlerTable to nmethod
835 835 handler_table->copy_to(this);
836 836 nul_chk_table->copy_to(this);
837 837
838 838 // we use the information of entry points to find out if a method is
839 839 // static or non static
840 840 assert(compiler->is_c2() ||
841 841 _method->is_static() == (entry_point() == _verified_entry_point),
842 842 " entry points must be same for static methods and vice versa");
843 843 }
844 844
845 845 bool printnmethods = PrintNMethods
846 846 || CompilerOracle::should_print(_method)
847 847 || CompilerOracle::has_option_string(_method, "PrintNMethods");
848 848 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
849 849 print_nmethod(printnmethods);
850 850 }
851 851
852 852 // Note: Do not verify in here as the CodeCache_lock is
853 853 // taken which would conflict with the CompiledIC_lock
854 854 // which taken during the verification of call sites.
855 855 // (was bug - gri 10/25/99)
856 856
857 857 Events::log("Create nmethod " INTPTR_FORMAT, this);
858 858 }
859 859
860 860
861 861 // Print a short set of xml attributes to identify this nmethod. The
862 862 // output should be embedded in some other element.
863 863 void nmethod::log_identity(xmlStream* log) const {
864 864 log->print(" compile_id='%d'", compile_id());
865 865 const char* nm_kind = compile_kind();
866 866 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind);
867 867 if (compiler() != NULL) {
868 868 log->print(" compiler='%s'", compiler()->name());
869 869 }
870 870 #ifdef TIERED
871 871 log->print(" level='%d'", comp_level());
872 872 #endif // TIERED
873 873 }
874 874
875 875
876 876 #define LOG_OFFSET(log, name) \
877 877 if ((intptr_t)name##_end() - (intptr_t)name##_begin()) \
878 878 log->print(" " XSTR(name) "_offset='%d'" , \
879 879 (intptr_t)name##_begin() - (intptr_t)this)
880 880
881 881
882 882 void nmethod::log_new_nmethod() const {
883 883 if (LogCompilation && xtty != NULL) {
884 884 ttyLocker ttyl;
885 885 HandleMark hm;
886 886 xtty->begin_elem("nmethod");
887 887 log_identity(xtty);
888 888 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'",
889 889 instructions_begin(), size());
890 890 xtty->print(" address='" INTPTR_FORMAT "'", (intptr_t) this);
891 891
892 892 LOG_OFFSET(xtty, relocation);
893 893 LOG_OFFSET(xtty, code);
894 894 LOG_OFFSET(xtty, stub);
895 895 LOG_OFFSET(xtty, consts);
896 896 LOG_OFFSET(xtty, scopes_data);
897 897 LOG_OFFSET(xtty, scopes_pcs);
898 898 LOG_OFFSET(xtty, dependencies);
899 899 LOG_OFFSET(xtty, handler_table);
900 900 LOG_OFFSET(xtty, nul_chk_table);
901 901 LOG_OFFSET(xtty, oops);
902 902
903 903 xtty->method(method());
904 904 xtty->stamp();
905 905 xtty->end_elem();
906 906 }
907 907 }
908 908
909 909 #undef LOG_OFFSET
910 910
911 911
912 912 // Print out more verbose output usually for a newly created nmethod.
913 913 void nmethod::print_on(outputStream* st, const char* title) const {
914 914 if (st != NULL) {
915 915 ttyLocker ttyl;
916 916 // Print a little tag line that looks like +PrintCompilation output:
917 917 int tlen = (int) strlen(title);
918 918 bool do_nl = false;
919 919 if (tlen > 0 && title[tlen-1] == '\n') { tlen--; do_nl = true; }
920 920 st->print("%3d%c %.*s",
921 921 compile_id(),
922 922 is_osr_method() ? '%' :
923 923 method() != NULL &&
924 924 is_native_method() ? 'n' : ' ',
925 925 tlen, title);
926 926 #ifdef TIERED
927 927 st->print(" (%d) ", comp_level());
928 928 #endif // TIERED
929 929 if (WizardMode) st->print(" (" INTPTR_FORMAT ")", this);
930 930 if (Universe::heap()->is_gc_active() && method() != NULL) {
931 931 st->print("(method)");
932 932 } else if (method() != NULL) {
933 933 method()->print_short_name(st);
934 934 if (is_osr_method())
935 935 st->print(" @ %d", osr_entry_bci());
936 936 if (method()->code_size() > 0)
937 937 st->print(" (%d bytes)", method()->code_size());
938 938 }
939 939
940 940 if (do_nl) st->cr();
941 941 }
942 942 }
943 943
944 944
945 945 void nmethod::print_nmethod(bool printmethod) {
946 946 ttyLocker ttyl; // keep the following output all in one block
947 947 if (xtty != NULL) {
948 948 xtty->begin_head("print_nmethod");
949 949 xtty->stamp();
950 950 xtty->end_head();
951 951 }
952 952 // print the header part first
953 953 print();
954 954 // then print the requested information
955 955 if (printmethod) {
956 956 print_code();
957 957 print_pcs();
958 958 oop_maps()->print();
959 959 }
960 960 if (PrintDebugInfo) {
961 961 print_scopes();
962 962 }
963 963 if (PrintRelocations) {
964 964 print_relocations();
965 965 }
966 966 if (PrintDependencies) {
967 967 print_dependencies();
968 968 }
969 969 if (PrintExceptionHandlers) {
970 970 print_handler_table();
971 971 print_nul_chk_table();
972 972 }
973 973 if (xtty != NULL) {
974 974 xtty->tail("print_nmethod");
975 975 }
976 976 }
977 977
978 978
979 979 void nmethod::set_version(int v) {
980 980 flags.version = v;
981 981 }
982 982
983 983
984 984 ScopeDesc* nmethod::scope_desc_at(address pc) {
985 985 PcDesc* pd = pc_desc_at(pc);
986 986 guarantee(pd != NULL, "scope must be present");
987 987 return new ScopeDesc(this, pd->scope_decode_offset(),
988 988 pd->obj_decode_offset(), pd->should_reexecute());
989 989 }
990 990
991 991
992 992 void nmethod::clear_inline_caches() {
993 993 assert(SafepointSynchronize::is_at_safepoint(), "cleaning of IC's only allowed at safepoint");
994 994 if (is_zombie()) {
995 995 return;
996 996 }
997 997
998 998 RelocIterator iter(this);
999 999 while (iter.next()) {
1000 1000 iter.reloc()->clear_inline_cache();
1001 1001 }
1002 1002 }
1003 1003
1004 1004
1005 1005 void nmethod::cleanup_inline_caches() {
1006 1006
1007 1007 assert(SafepointSynchronize::is_at_safepoint() &&
1008 1008 !CompiledIC_lock->is_locked() &&
1009 1009 !Patching_lock->is_locked(), "no threads must be updating the inline caches by them selfs");
1010 1010
1011 1011 // If the method is not entrant or zombie then a JMP is plastered over the
1012 1012 // first few bytes. If an oop in the old code was there, that oop
1013 1013 // should not get GC'd. Skip the first few bytes of oops on
1014 1014 // not-entrant methods.
1015 1015 address low_boundary = verified_entry_point();
1016 1016 if (!is_in_use()) {
1017 1017 low_boundary += NativeJump::instruction_size;
1018 1018 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1019 1019 // This means that the low_boundary is going to be a little too high.
1020 1020 // This shouldn't matter, since oops of non-entrant methods are never used.
1021 1021 // In fact, why are we bothering to look at oops in a non-entrant method??
1022 1022 }
1023 1023
1024 1024 // Find all calls in an nmethod, and clear the ones that points to zombie methods
1025 1025 ResourceMark rm;
1026 1026 RelocIterator iter(this, low_boundary);
1027 1027 while(iter.next()) {
1028 1028 switch(iter.type()) {
1029 1029 case relocInfo::virtual_call_type:
1030 1030 case relocInfo::opt_virtual_call_type: {
1031 1031 CompiledIC *ic = CompiledIC_at(iter.reloc());
1032 1032 // Ok, to lookup references to zombies here
1033 1033 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
1034 1034 if( cb != NULL && cb->is_nmethod() ) {
1035 1035 nmethod* nm = (nmethod*)cb;
1036 1036 // Clean inline caches pointing to both zombie and not_entrant methods
1037 1037 if (!nm->is_in_use()) ic->set_to_clean();
1038 1038 }
1039 1039 break;
1040 1040 }
1041 1041 case relocInfo::static_call_type: {
1042 1042 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
1043 1043 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
1044 1044 if( cb != NULL && cb->is_nmethod() ) {
1045 1045 nmethod* nm = (nmethod*)cb;
1046 1046 // Clean inline caches pointing to both zombie and not_entrant methods
1047 1047 if (!nm->is_in_use()) csc->set_to_clean();
1048 1048 }
1049 1049 break;
1050 1050 }
1051 1051 }
1052 1052 }
1053 1053 }
1054 1054
1055 1055 // This is a private interface with the sweeper.
1056 1056 void nmethod::mark_as_seen_on_stack() {
1057 1057 assert(is_not_entrant(), "must be a non-entrant method");
1058 1058 set_stack_traversal_mark(NMethodSweeper::traversal_count());
1059 1059 }
1060 1060
1061 1061 // Tell if a non-entrant method can be converted to a zombie (i.e., there is no activations on the stack)
1062 1062 bool nmethod::can_not_entrant_be_converted() {
1063 1063 assert(is_not_entrant(), "must be a non-entrant method");
1064 1064 assert(SafepointSynchronize::is_at_safepoint(), "must be called during a safepoint");
1065 1065
1066 1066 // Since the nmethod sweeper only does partial sweep the sweeper's traversal
1067 1067 // count can be greater than the stack traversal count before it hits the
1068 1068 // nmethod for the second time.
1069 1069 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count();
1070 1070 }
1071 1071
1072 1072 void nmethod::inc_decompile_count() {
1073 1073 // Could be gated by ProfileTraps, but do not bother...
1074 1074 methodOop m = method();
1075 1075 if (m == NULL) return;
1076 1076 methodDataOop mdo = m->method_data();
1077 1077 if (mdo == NULL) return;
1078 1078 // There is a benign race here. See comments in methodDataOop.hpp.
1079 1079 mdo->inc_decompile_count();
1080 1080 }
1081 1081
1082 1082 void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) {
1083 1083
1084 1084 post_compiled_method_unload();
1085 1085
1086 1086 // Since this nmethod is being unloaded, make sure that dependencies
1087 1087 // recorded in instanceKlasses get flushed and pass non-NULL closure to
1088 1088 // indicate that this work is being done during a GC.
1089 1089 assert(Universe::heap()->is_gc_active(), "should only be called during gc");
1090 1090 assert(is_alive != NULL, "Should be non-NULL");
1091 1091 // A non-NULL is_alive closure indicates that this is being called during GC.
1092 1092 flush_dependencies(is_alive);
1093 1093
1094 1094 // Break cycle between nmethod & method
1095 1095 if (TraceClassUnloading && WizardMode) {
1096 1096 tty->print_cr("[Class unloading: Making nmethod " INTPTR_FORMAT
1097 1097 " unloadable], methodOop(" INTPTR_FORMAT
1098 1098 "), cause(" INTPTR_FORMAT ")",
1099 1099 this, (address)_method, (address)cause);
1100 1100 if (!Universe::heap()->is_gc_active())
1101 1101 cause->klass()->print();
1102 1102 }
1103 1103 // Unlink the osr method, so we do not look this up again
1104 1104 if (is_osr_method()) {
1105 1105 invalidate_osr_method();
1106 1106 }
1107 1107 // If _method is already NULL the methodOop is about to be unloaded,
1108 1108 // so we don't have to break the cycle. Note that it is possible to
1109 1109 // have the methodOop live here, in case we unload the nmethod because
1110 1110 // it is pointing to some oop (other than the methodOop) being unloaded.
1111 1111 if (_method != NULL) {
1112 1112 // OSR methods point to the methodOop, but the methodOop does not
1113 1113 // point back!
1114 1114 if (_method->code() == this) {
1115 1115 _method->clear_code(); // Break a cycle
1116 1116 }
1117 1117 inc_decompile_count(); // Last chance to make a mark on the MDO
1118 1118 _method = NULL; // Clear the method of this dead nmethod
1119 1119 }
1120 1120 // Make the class unloaded - i.e., change state and notify sweeper
1121 1121 check_safepoint();
1122 1122 if (is_in_use()) {
1123 1123 // Transitioning directly from live to unloaded -- so
1124 1124 // we need to force a cache clean-up; remember this
1125 1125 // for later on.
1126 1126 CodeCache::set_needs_cache_clean(true);
1127 1127 }
1128 1128 flags.state = unloaded;
1129 1129
1130 1130 // The methodOop is gone at this point
1131 1131 assert(_method == NULL, "Tautology");
1132 1132
1133 1133 set_osr_link(NULL);
1134 1134 //set_scavenge_root_link(NULL); // done by prune_scavenge_root_nmethods
1135 1135 NMethodSweeper::notify(this);
1136 1136 }
1137 1137
1138 1138 void nmethod::invalidate_osr_method() {
1139 1139 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
1140 1140 if (_entry_bci != InvalidOSREntryBci)
1141 1141 inc_decompile_count();
1142 1142 // Remove from list of active nmethods
1143 1143 if (method() != NULL)
1144 1144 instanceKlass::cast(method()->method_holder())->remove_osr_nmethod(this);
1145 1145 // Set entry as invalid
1146 1146 _entry_bci = InvalidOSREntryBci;
1147 1147 }
1148 1148
1149 1149 void nmethod::log_state_change(int state) const {
1150 1150 if (LogCompilation) {
1151 1151 if (xtty != NULL) {
1152 1152 ttyLocker ttyl; // keep the following output all in one block
1153 1153 xtty->begin_elem("make_not_entrant %sthread='" UINTX_FORMAT "'",
1154 1154 (state == zombie ? "zombie='1' " : ""),
1155 1155 os::current_thread_id());
1156 1156 log_identity(xtty);
1157 1157 xtty->stamp();
1158 1158 xtty->end_elem();
1159 1159 }
1160 1160 }
1161 1161 if (PrintCompilation) {
1162 1162 print_on(tty, state == zombie ? "made zombie " : "made not entrant ");
1163 1163 tty->cr();
1164 1164 }
1165 1165 }
1166 1166
1167 1167 // Common functionality for both make_not_entrant and make_zombie
1168 1168 void nmethod::make_not_entrant_or_zombie(int state) {
1169 1169 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant");
1170 1170
1171 1171 // Code for an on-stack-replacement nmethod is removed when a class gets unloaded.
1172 1172 // They never become zombie/non-entrant, so the nmethod sweeper will never remove
1173 1173 // them. Instead the entry_bci is set to InvalidOSREntryBci, so the osr nmethod
1174 1174 // will never be used anymore. That the nmethods only gets removed when class unloading
1175 1175 // happens, make life much simpler, since the nmethods are not just going to disappear
1176 1176 // out of the blue.
1177 1177 if (is_osr_method()) {
1178 1178 if (osr_entry_bci() != InvalidOSREntryBci) {
1179 1179 // only log this once
1180 1180 log_state_change(state);
1181 1181 }
1182 1182 invalidate_osr_method();
1183 1183 return;
1184 1184 }
1185 1185
1186 1186 // If the method is already zombie or set to the state we want, nothing to do
1187 1187 if (is_zombie() || (state == not_entrant && is_not_entrant())) {
1188 1188 return;
1189 1189 }
1190 1190
1191 1191 log_state_change(state);
1192 1192
1193 1193 // Make sure the nmethod is not flushed in case of a safepoint in code below.
1194 1194 nmethodLocker nml(this);
1195 1195
1196 1196 {
1197 1197 // Enter critical section. Does not block for safepoint.
1198 1198 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1199 1199 // The caller can be calling the method statically or through an inline
1200 1200 // cache call.
1201 1201 if (!is_not_entrant()) {
1202 1202 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
1203 1203 SharedRuntime::get_handle_wrong_method_stub());
1204 1204 assert (NativeJump::instruction_size == nmethod::_zombie_instruction_size, "");
1205 1205 }
1206 1206
1207 1207 // When the nmethod becomes zombie it is no longer alive so the
1208 1208 // dependencies must be flushed. nmethods in the not_entrant
1209 1209 // state will be flushed later when the transition to zombie
1210 1210 // happens or they get unloaded.
1211 1211 if (state == zombie) {
1212 1212 assert(SafepointSynchronize::is_at_safepoint(), "must be done at safepoint");
1213 1213 flush_dependencies(NULL);
1214 1214 } else {
1215 1215 assert(state == not_entrant, "other cases may need to be handled differently");
1216 1216 }
1217 1217
1218 1218 // Change state
1219 1219 flags.state = state;
1220 1220 } // leave critical region under Patching_lock
1221 1221
1222 1222 if (state == not_entrant) {
1223 1223 Events::log("Make nmethod not entrant " INTPTR_FORMAT, this);
1224 1224 } else {
1225 1225 Events::log("Make nmethod zombie " INTPTR_FORMAT, this);
1226 1226 }
1227 1227
1228 1228 if (TraceCreateZombies) {
1229 1229 tty->print_cr("nmethod <" INTPTR_FORMAT "> code made %s", this, (state == not_entrant) ? "not entrant" : "zombie");
1230 1230 }
1231 1231
1232 1232 // Make sweeper aware that there is a zombie method that needs to be removed
1233 1233 NMethodSweeper::notify(this);
1234 1234
1235 1235 // not_entrant only stuff
1236 1236 if (state == not_entrant) {
1237 1237 mark_as_seen_on_stack();
1238 1238 }
1239 1239
1240 1240 // It's a true state change, so mark the method as decompiled.
1241 1241 inc_decompile_count();
1242 1242
1243 1243
1244 1244 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload event
1245 1245 // and it hasn't already been reported for this nmethod then report it now.
1246 1246 // (the event may have been reported earilier if the GC marked it for unloading).
1247 1247 if (state == zombie) {
1248 1248
1249 1249 DTRACE_METHOD_UNLOAD_PROBE(method());
1250 1250
1251 1251 if (JvmtiExport::should_post_compiled_method_unload() &&
1252 1252 !unload_reported()) {
1253 1253 assert(method() != NULL, "checking");
1254 1254 {
1255 1255 HandleMark hm;
1256 1256 JvmtiExport::post_compiled_method_unload_at_safepoint(
1257 1257 method()->jmethod_id(), code_begin());
1258 1258 }
1259 1259 set_unload_reported();
1260 1260 }
1261 1261 }
1262 1262
1263 1263
1264 1264 // Zombie only stuff
1265 1265 if (state == zombie) {
1266 1266 VTune::delete_nmethod(this);
1267 1267 }
1268 1268
1269 1269 // Check whether method got unloaded at a safepoint before this,
1270 1270 // if so we can skip the flushing steps below
1271 1271 if (method() == NULL) return;
1272 1272
1273 1273 // Remove nmethod from method.
1274 1274 // We need to check if both the _code and _from_compiled_code_entry_point
1275 1275 // refer to this nmethod because there is a race in setting these two fields
1276 1276 // in methodOop as seen in bugid 4947125.
1277 1277 // If the vep() points to the zombie nmethod, the memory for the nmethod
1278 1278 // could be flushed and the compiler and vtable stubs could still call
1279 1279 // through it.
1280 1280 if (method()->code() == this ||
1281 1281 method()->from_compiled_entry() == verified_entry_point()) {
1282 1282 HandleMark hm;
1283 1283 method()->clear_code();
1284 1284 }
1285 1285 }
1286 1286
1287 1287
1288 1288 #ifndef PRODUCT
1289 1289 void nmethod::check_safepoint() {
1290 1290 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
1291 1291 }
1292 1292 #endif
1293 1293
1294 1294
1295 1295 void nmethod::flush() {
1296 1296 // Note that there are no valid oops in the nmethod anymore.
1297 1297 assert(is_zombie() || (is_osr_method() && is_unloaded()), "must be a zombie method");
1298 1298 assert(is_marked_for_reclamation() || (is_osr_method() && is_unloaded()), "must be marked for reclamation");
1299 1299
1300 1300 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed");
1301 1301 check_safepoint();
1302 1302
1303 1303 // completely deallocate this method
1304 1304 EventMark m("flushing nmethod " INTPTR_FORMAT " %s", this, "");
1305 1305 if (PrintMethodFlushing) {
1306 1306 tty->print_cr("*flushing nmethod " INTPTR_FORMAT ". Live blobs: %d", this, CodeCache::nof_blobs());
1307 1307 }
1308 1308
1309 1309 // We need to deallocate any ExceptionCache data.
1310 1310 // Note that we do not need to grab the nmethod lock for this, it
1311 1311 // better be thread safe if we're disposing of it!
1312 1312 ExceptionCache* ec = exception_cache();
1313 1313 set_exception_cache(NULL);
1314 1314 while(ec != NULL) {
1315 1315 ExceptionCache* next = ec->next();
1316 1316 delete ec;
1317 1317 ec = next;
1318 1318 }
1319 1319
1320 1320 if (on_scavenge_root_list()) {
1321 1321 CodeCache::drop_scavenge_root_nmethod(this);
1322 1322 }
1323 1323
1324 1324 ((CodeBlob*)(this))->flush();
1325 1325
1326 1326 CodeCache::free(this);
1327 1327 }
1328 1328
1329 1329
1330 1330 //
1331 1331 // Notify all classes this nmethod is dependent on that it is no
1332 1332 // longer dependent. This should only be called in two situations.
1333 1333 // First, when a nmethod transitions to a zombie all dependents need
1334 1334 // to be clear. Since zombification happens at a safepoint there's no
1335 1335 // synchronization issues. The second place is a little more tricky.
1336 1336 // During phase 1 of mark sweep class unloading may happen and as a
1337 1337 // result some nmethods may get unloaded. In this case the flushing
1338 1338 // of dependencies must happen during phase 1 since after GC any
1339 1339 // dependencies in the unloaded nmethod won't be updated, so
1340 1340 // traversing the dependency information in unsafe. In that case this
1341 1341 // function is called with a non-NULL argument and this function only
1342 1342 // notifies instanceKlasses that are reachable
1343 1343
1344 1344 void nmethod::flush_dependencies(BoolObjectClosure* is_alive) {
1345 1345 assert(SafepointSynchronize::is_at_safepoint(), "must be done at safepoint");
1346 1346 assert(Universe::heap()->is_gc_active() == (is_alive != NULL),
1347 1347 "is_alive is non-NULL if and only if we are called during GC");
1348 1348 if (!has_flushed_dependencies()) {
1349 1349 set_has_flushed_dependencies();
1350 1350 for (Dependencies::DepStream deps(this); deps.next(); ) {
1351 1351 klassOop klass = deps.context_type();
1352 1352 if (klass == NULL) continue; // ignore things like evol_method
1353 1353
1354 1354 // During GC the is_alive closure is non-NULL, and is used to
1355 1355 // determine liveness of dependees that need to be updated.
1356 1356 if (is_alive == NULL || is_alive->do_object_b(klass)) {
1357 1357 instanceKlass::cast(klass)->remove_dependent_nmethod(this);
1358 1358 }
1359 1359 }
1360 1360 }
1361 1361 }
1362 1362
1363 1363
1364 1364 // If this oop is not live, the nmethod can be unloaded.
1365 1365 bool nmethod::can_unload(BoolObjectClosure* is_alive,
1366 1366 OopClosure* keep_alive,
1367 1367 oop* root, bool unloading_occurred) {
1368 1368 assert(root != NULL, "just checking");
1369 1369 oop obj = *root;
1370 1370 if (obj == NULL || is_alive->do_object_b(obj)) {
1371 1371 return false;
1372 1372 }
1373 1373 if (obj->is_compiledICHolder()) {
1374 1374 compiledICHolderOop cichk_oop = compiledICHolderOop(obj);
1375 1375 if (is_alive->do_object_b(
1376 1376 cichk_oop->holder_method()->method_holder()) &&
1377 1377 is_alive->do_object_b(cichk_oop->holder_klass())) {
1378 1378 // The oop should be kept alive
1379 1379 keep_alive->do_oop(root);
1380 1380 return false;
1381 1381 }
1382 1382 }
1383 1383 // If ScavengeRootsInCode is true, an nmethod might be unloaded
1384 1384 // simply because one of its constant oops has gone dead.
1385 1385 // No actual classes need to be unloaded in order for this to occur.
1386 1386 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading");
1387 1387 make_unloaded(is_alive, obj);
1388 1388 return true;
1389 1389 }
1390 1390
1391 1391 // ------------------------------------------------------------------
1392 1392 // post_compiled_method_load_event
1393 1393 // new method for install_code() path
1394 1394 // Transfer information from compilation to jvmti
1395 1395 void nmethod::post_compiled_method_load_event() {
1396 1396
1397 1397 methodOop moop = method();
1398 1398 HS_DTRACE_PROBE8(hotspot, compiled__method__load,
1399 1399 moop->klass_name()->bytes(),
1400 1400 moop->klass_name()->utf8_length(),
1401 1401 moop->name()->bytes(),
1402 1402 moop->name()->utf8_length(),
1403 1403 moop->signature()->bytes(),
1404 1404 moop->signature()->utf8_length(),
1405 1405 code_begin(), code_size());
1406 1406
1407 1407 if (JvmtiExport::should_post_compiled_method_load()) {
1408 1408 JvmtiExport::post_compiled_method_load(this);
1409 1409 }
1410 1410 }
1411 1411
1412 1412 void nmethod::post_compiled_method_unload() {
1413 1413 assert(_method != NULL && !is_unloaded(), "just checking");
1414 1414 DTRACE_METHOD_UNLOAD_PROBE(method());
1415 1415
1416 1416 // If a JVMTI agent has enabled the CompiledMethodUnload event then
1417 1417 // post the event. Sometime later this nmethod will be made a zombie by
1418 1418 // the sweeper but the methodOop will not be valid at that point.
1419 1419 if (JvmtiExport::should_post_compiled_method_unload()) {
1420 1420 assert(!unload_reported(), "already unloaded");
1421 1421 HandleMark hm;
1422 1422 JvmtiExport::post_compiled_method_unload_at_safepoint(
1423 1423 method()->jmethod_id(), code_begin());
1424 1424 }
1425 1425
1426 1426 // The JVMTI CompiledMethodUnload event can be enabled or disabled at
1427 1427 // any time. As the nmethod is being unloaded now we mark it has
1428 1428 // having the unload event reported - this will ensure that we don't
1429 1429 // attempt to report the event in the unlikely scenario where the
1430 1430 // event is enabled at the time the nmethod is made a zombie.
1431 1431 set_unload_reported();
1432 1432 }
1433 1433
1434 1434 // This is called at the end of the strong tracing/marking phase of a
1435 1435 // GC to unload an nmethod if it contains otherwise unreachable
1436 1436 // oops.
1437 1437
1438 1438 void nmethod::do_unloading(BoolObjectClosure* is_alive,
1439 1439 OopClosure* keep_alive, bool unloading_occurred) {
1440 1440 // Make sure the oop's ready to receive visitors
1441 1441 assert(!is_zombie() && !is_unloaded(),
1442 1442 "should not call follow on zombie or unloaded nmethod");
1443 1443
1444 1444 // If the method is not entrant then a JMP is plastered over the
1445 1445 // first few bytes. If an oop in the old code was there, that oop
1446 1446 // should not get GC'd. Skip the first few bytes of oops on
1447 1447 // not-entrant methods.
1448 1448 address low_boundary = verified_entry_point();
1449 1449 if (is_not_entrant()) {
1450 1450 low_boundary += NativeJump::instruction_size;
1451 1451 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1452 1452 // (See comment above.)
1453 1453 }
1454 1454
1455 1455 // The RedefineClasses() API can cause the class unloading invariant
1456 1456 // to no longer be true. See jvmtiExport.hpp for details.
1457 1457 // Also, leave a debugging breadcrumb in local flag.
1458 1458 bool a_class_was_redefined = JvmtiExport::has_redefined_a_class();
1459 1459 if (a_class_was_redefined) {
1460 1460 // This set of the unloading_occurred flag is done before the
1461 1461 // call to post_compiled_method_unload() so that the unloading
1462 1462 // of this nmethod is reported.
1463 1463 unloading_occurred = true;
1464 1464 }
1465 1465
1466 1466 // Follow methodOop
1467 1467 if (can_unload(is_alive, keep_alive, (oop*)&_method, unloading_occurred)) {
1468 1468 return;
1469 1469 }
1470 1470
1471 1471 // Exception cache
1472 1472 ExceptionCache* ec = exception_cache();
1473 1473 while (ec != NULL) {
1474 1474 oop* ex_addr = (oop*)ec->exception_type_addr();
1475 1475 oop ex = *ex_addr;
1476 1476 ExceptionCache* next_ec = ec->next();
1477 1477 if (ex != NULL && !is_alive->do_object_b(ex)) {
1478 1478 assert(!ex->is_compiledICHolder(), "Possible error here");
1479 1479 remove_from_exception_cache(ec);
1480 1480 }
1481 1481 ec = next_ec;
1482 1482 }
1483 1483
1484 1484 // If class unloading occurred we first iterate over all inline caches and
1485 1485 // clear ICs where the cached oop is referring to an unloaded klass or method.
1486 1486 // The remaining live cached oops will be traversed in the relocInfo::oop_type
1487 1487 // iteration below.
1488 1488 if (unloading_occurred) {
1489 1489 RelocIterator iter(this, low_boundary);
1490 1490 while(iter.next()) {
1491 1491 if (iter.type() == relocInfo::virtual_call_type) {
1492 1492 CompiledIC *ic = CompiledIC_at(iter.reloc());
1493 1493 oop ic_oop = ic->cached_oop();
1494 1494 if (ic_oop != NULL && !is_alive->do_object_b(ic_oop)) {
1495 1495 // The only exception is compiledICHolder oops which may
1496 1496 // yet be marked below. (We check this further below).
1497 1497 if (ic_oop->is_compiledICHolder()) {
1498 1498 compiledICHolderOop cichk_oop = compiledICHolderOop(ic_oop);
1499 1499 if (is_alive->do_object_b(
1500 1500 cichk_oop->holder_method()->method_holder()) &&
1501 1501 is_alive->do_object_b(cichk_oop->holder_klass())) {
1502 1502 continue;
1503 1503 }
1504 1504 }
1505 1505 ic->set_to_clean();
1506 1506 assert(ic->cached_oop() == NULL, "cached oop in IC should be cleared")
1507 1507 }
1508 1508 }
1509 1509 }
1510 1510 }
1511 1511
1512 1512 // Compiled code
1513 1513 RelocIterator iter(this, low_boundary);
1514 1514 while (iter.next()) {
1515 1515 if (iter.type() == relocInfo::oop_type) {
1516 1516 oop_Relocation* r = iter.oop_reloc();
1517 1517 // In this loop, we must only traverse those oops directly embedded in
1518 1518 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1519 1519 assert(1 == (r->oop_is_immediate()) +
1520 1520 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1521 1521 "oop must be found in exactly one place");
1522 1522 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1523 1523 if (can_unload(is_alive, keep_alive, r->oop_addr(), unloading_occurred)) {
1524 1524 return;
1525 1525 }
1526 1526 }
1527 1527 }
1528 1528 }
1529 1529
1530 1530
1531 1531 // Scopes
1532 1532 for (oop* p = oops_begin(); p < oops_end(); p++) {
1533 1533 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1534 1534 if (can_unload(is_alive, keep_alive, p, unloading_occurred)) {
1535 1535 return;
1536 1536 }
1537 1537 }
1538 1538
1539 1539 #ifndef PRODUCT
1540 1540 // This nmethod was not unloaded; check below that all CompiledICs
1541 1541 // refer to marked oops.
1542 1542 {
1543 1543 RelocIterator iter(this, low_boundary);
1544 1544 while (iter.next()) {
1545 1545 if (iter.type() == relocInfo::virtual_call_type) {
1546 1546 CompiledIC *ic = CompiledIC_at(iter.reloc());
1547 1547 oop ic_oop = ic->cached_oop();
1548 1548 assert(ic_oop == NULL || is_alive->do_object_b(ic_oop),
1549 1549 "Found unmarked ic_oop in reachable nmethod");
1550 1550 }
1551 1551 }
1552 1552 }
1553 1553 #endif // !PRODUCT
1554 1554 }
1555 1555
1556 1556 // This method is called twice during GC -- once while
1557 1557 // tracing the "active" nmethods on thread stacks during
1558 1558 // the (strong) marking phase, and then again when walking
1559 1559 // the code cache contents during the weak roots processing
1560 1560 // phase. The two uses are distinguished by means of the
1561 1561 // 'do_strong_roots_only' flag, which is true in the first
1562 1562 // case. We want to walk the weak roots in the nmethod
1563 1563 // only in the second case. The weak roots in the nmethod
1564 1564 // are the oops in the ExceptionCache and the InlineCache
1565 1565 // oops.
1566 1566 void nmethod::oops_do(OopClosure* f, bool do_strong_roots_only) {
1567 1567 // make sure the oops ready to receive visitors
1568 1568 assert(!is_zombie() && !is_unloaded(),
1569 1569 "should not call follow on zombie or unloaded nmethod");
1570 1570
1571 1571 // If the method is not entrant or zombie then a JMP is plastered over the
1572 1572 // first few bytes. If an oop in the old code was there, that oop
1573 1573 // should not get GC'd. Skip the first few bytes of oops on
1574 1574 // not-entrant methods.
1575 1575 address low_boundary = verified_entry_point();
1576 1576 if (is_not_entrant()) {
1577 1577 low_boundary += NativeJump::instruction_size;
1578 1578 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1579 1579 // (See comment above.)
1580 1580 }
1581 1581
1582 1582 // Compiled code
1583 1583 f->do_oop((oop*) &_method);
1584 1584 if (!do_strong_roots_only) {
1585 1585 // weak roots processing phase -- update ExceptionCache oops
1586 1586 ExceptionCache* ec = exception_cache();
1587 1587 while(ec != NULL) {
1588 1588 f->do_oop((oop*)ec->exception_type_addr());
1589 1589 ec = ec->next();
1590 1590 }
1591 1591 } // Else strong roots phase -- skip oops in ExceptionCache
1592 1592
1593 1593 RelocIterator iter(this, low_boundary);
1594 1594
1595 1595 while (iter.next()) {
1596 1596 if (iter.type() == relocInfo::oop_type ) {
1597 1597 oop_Relocation* r = iter.oop_reloc();
1598 1598 // In this loop, we must only follow those oops directly embedded in
1599 1599 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1600 1600 assert(1 == (r->oop_is_immediate()) +
1601 1601 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1602 1602 "oop must be found in exactly one place");
1603 1603 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1604 1604 f->do_oop(r->oop_addr());
1605 1605 }
1606 1606 }
1607 1607 }
1608 1608
1609 1609 // Scopes
1610 1610 // This includes oop constants not inlined in the code stream.
1611 1611 for (oop* p = oops_begin(); p < oops_end(); p++) {
1612 1612 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1613 1613 f->do_oop(p);
1614 1614 }
1615 1615 }
1616 1616
1617 1617 #define NMETHOD_SENTINEL ((nmethod*)badAddress)
1618 1618
1619 1619 nmethod* volatile nmethod::_oops_do_mark_nmethods;
1620 1620
1621 1621 // An nmethod is "marked" if its _mark_link is set non-null.
1622 1622 // Even if it is the end of the linked list, it will have a non-null link value,
1623 1623 // as long as it is on the list.
1624 1624 // This code must be MP safe, because it is used from parallel GC passes.
1625 1625 bool nmethod::test_set_oops_do_mark() {
1626 1626 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");
1627 1627 nmethod* observed_mark_link = _oops_do_mark_link;
1628 1628 if (observed_mark_link == NULL) {
1629 1629 // Claim this nmethod for this thread to mark.
1630 1630 observed_mark_link = (nmethod*)
1631 1631 Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_link, NULL);
1632 1632 if (observed_mark_link == NULL) {
1633 1633
1634 1634 // Atomically append this nmethod (now claimed) to the head of the list:
1635 1635 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods;
1636 1636 for (;;) {
1637 1637 nmethod* required_mark_nmethods = observed_mark_nmethods;
1638 1638 _oops_do_mark_link = required_mark_nmethods;
1639 1639 observed_mark_nmethods = (nmethod*)
1640 1640 Atomic::cmpxchg_ptr(this, &_oops_do_mark_nmethods, required_mark_nmethods);
1641 1641 if (observed_mark_nmethods == required_mark_nmethods)
1642 1642 break;
1643 1643 }
1644 1644 // Mark was clear when we first saw this guy.
1645 1645 NOT_PRODUCT(if (TraceScavenge) print_on(tty, "oops_do, mark\n"));
1646 1646 return false;
1647 1647 }
1648 1648 }
1649 1649 // On fall through, another racing thread marked this nmethod before we did.
1650 1650 return true;
1651 1651 }
1652 1652
1653 1653 void nmethod::oops_do_marking_prologue() {
1654 1654 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("[oops_do_marking_prologue"));
1655 1655 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row");
1656 1656 // We use cmpxchg_ptr instead of regular assignment here because the user
1657 1657 // may fork a bunch of threads, and we need them all to see the same state.
1658 1658 void* observed = Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, NULL);
1659 1659 guarantee(observed == NULL, "no races in this sequential code");
1660 1660 }
1661 1661
1662 1662 void nmethod::oops_do_marking_epilogue() {
1663 1663 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row");
1664 1664 nmethod* cur = _oops_do_mark_nmethods;
1665 1665 while (cur != NMETHOD_SENTINEL) {
1666 1666 assert(cur != NULL, "not NULL-terminated");
1667 1667 nmethod* next = cur->_oops_do_mark_link;
1668 1668 cur->_oops_do_mark_link = NULL;
1669 1669 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark\n"));
1670 1670 cur = next;
1671 1671 }
1672 1672 void* required = _oops_do_mark_nmethods;
1673 1673 void* observed = Atomic::cmpxchg_ptr(NULL, &_oops_do_mark_nmethods, required);
1674 1674 guarantee(observed == required, "no races in this sequential code");
1675 1675 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("oops_do_marking_epilogue]"));
1676 1676 }
1677 1677
1678 1678 class DetectScavengeRoot: public OopClosure {
1679 1679 bool _detected_scavenge_root;
1680 1680 public:
1681 1681 DetectScavengeRoot() : _detected_scavenge_root(false)
1682 1682 { NOT_PRODUCT(_print_nm = NULL); }
1683 1683 bool detected_scavenge_root() { return _detected_scavenge_root; }
1684 1684 virtual void do_oop(oop* p) {
1685 1685 if ((*p) != NULL && (*p)->is_scavengable()) {
1686 1686 NOT_PRODUCT(maybe_print(p));
1687 1687 _detected_scavenge_root = true;
1688 1688 }
1689 1689 }
1690 1690 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
1691 1691
1692 1692 #ifndef PRODUCT
1693 1693 nmethod* _print_nm;
1694 1694 void maybe_print(oop* p) {
1695 1695 if (_print_nm == NULL) return;
1696 1696 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root");
1697 1697 tty->print_cr(""PTR_FORMAT"[offset=%d] detected non-perm oop "PTR_FORMAT" (found at "PTR_FORMAT")",
1698 1698 _print_nm, (int)((intptr_t)p - (intptr_t)_print_nm),
1699 1699 (intptr_t)(*p), (intptr_t)p);
1700 1700 (*p)->print();
1701 1701 }
1702 1702 #endif //PRODUCT
1703 1703 };
1704 1704
1705 1705 bool nmethod::detect_scavenge_root_oops() {
1706 1706 DetectScavengeRoot detect_scavenge_root;
1707 1707 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this);
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1708 1708 oops_do(&detect_scavenge_root);
1709 1709 return detect_scavenge_root.detected_scavenge_root();
1710 1710 }
1711 1711
1712 1712 // Method that knows how to preserve outgoing arguments at call. This method must be
1713 1713 // called with a frame corresponding to a Java invoke
1714 1714 void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) {
1715 1715 if (!method()->is_native()) {
1716 1716 SimpleScopeDesc ssd(this, fr.pc());
1717 1717 Bytecode_invoke* call = Bytecode_invoke_at(ssd.method(), ssd.bci());
1718 - bool is_static = call->is_invokestatic();
1718 + bool has_receiver = call->has_receiver();
1719 1719 symbolOop signature = call->signature();
1720 - fr.oops_compiled_arguments_do(signature, is_static, reg_map, f);
1720 + fr.oops_compiled_arguments_do(signature, has_receiver, reg_map, f);
1721 1721 }
1722 1722 }
1723 1723
1724 1724
1725 1725 oop nmethod::embeddedOop_at(u_char* p) {
1726 1726 RelocIterator iter(this, p, p + oopSize);
1727 1727 while (iter.next())
1728 1728 if (iter.type() == relocInfo::oop_type) {
1729 1729 return iter.oop_reloc()->oop_value();
1730 1730 }
1731 1731 return NULL;
1732 1732 }
1733 1733
1734 1734
1735 1735 inline bool includes(void* p, void* from, void* to) {
1736 1736 return from <= p && p < to;
1737 1737 }
1738 1738
1739 1739
1740 1740 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
1741 1741 assert(count >= 2, "must be sentinel values, at least");
1742 1742
1743 1743 #ifdef ASSERT
1744 1744 // must be sorted and unique; we do a binary search in find_pc_desc()
1745 1745 int prev_offset = pcs[0].pc_offset();
1746 1746 assert(prev_offset == PcDesc::lower_offset_limit,
1747 1747 "must start with a sentinel");
1748 1748 for (int i = 1; i < count; i++) {
1749 1749 int this_offset = pcs[i].pc_offset();
1750 1750 assert(this_offset > prev_offset, "offsets must be sorted");
1751 1751 prev_offset = this_offset;
1752 1752 }
1753 1753 assert(prev_offset == PcDesc::upper_offset_limit,
1754 1754 "must end with a sentinel");
1755 1755 #endif //ASSERT
1756 1756
1757 1757 // Search for MethodHandle invokes and tag the nmethod.
1758 1758 for (int i = 0; i < count; i++) {
1759 1759 if (pcs[i].is_method_handle_invoke()) {
1760 1760 set_has_method_handle_invokes(true);
1761 1761 break;
1762 1762 }
1763 1763 }
1764 1764
1765 1765 int size = count * sizeof(PcDesc);
1766 1766 assert(scopes_pcs_size() >= size, "oob");
1767 1767 memcpy(scopes_pcs_begin(), pcs, size);
1768 1768
1769 1769 // Adjust the final sentinel downward.
1770 1770 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
1771 1771 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
1772 1772 last_pc->set_pc_offset(instructions_size() + 1);
1773 1773 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
1774 1774 // Fill any rounding gaps with copies of the last record.
1775 1775 last_pc[1] = last_pc[0];
1776 1776 }
1777 1777 // The following assert could fail if sizeof(PcDesc) is not
1778 1778 // an integral multiple of oopSize (the rounding term).
1779 1779 // If it fails, change the logic to always allocate a multiple
1780 1780 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
1781 1781 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
1782 1782 }
1783 1783
1784 1784 void nmethod::copy_scopes_data(u_char* buffer, int size) {
1785 1785 assert(scopes_data_size() >= size, "oob");
1786 1786 memcpy(scopes_data_begin(), buffer, size);
1787 1787 }
1788 1788
1789 1789
1790 1790 #ifdef ASSERT
1791 1791 static PcDesc* linear_search(nmethod* nm, int pc_offset, bool approximate) {
1792 1792 PcDesc* lower = nm->scopes_pcs_begin();
1793 1793 PcDesc* upper = nm->scopes_pcs_end();
1794 1794 lower += 1; // exclude initial sentinel
1795 1795 PcDesc* res = NULL;
1796 1796 for (PcDesc* p = lower; p < upper; p++) {
1797 1797 NOT_PRODUCT(--nmethod_stats.pc_desc_tests); // don't count this call to match_desc
1798 1798 if (match_desc(p, pc_offset, approximate)) {
1799 1799 if (res == NULL)
1800 1800 res = p;
1801 1801 else
1802 1802 res = (PcDesc*) badAddress;
1803 1803 }
1804 1804 }
1805 1805 return res;
1806 1806 }
1807 1807 #endif
1808 1808
1809 1809
1810 1810 // Finds a PcDesc with real-pc equal to "pc"
1811 1811 PcDesc* nmethod::find_pc_desc_internal(address pc, bool approximate) {
1812 1812 address base_address = instructions_begin();
1813 1813 if ((pc < base_address) ||
1814 1814 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
1815 1815 return NULL; // PC is wildly out of range
1816 1816 }
1817 1817 int pc_offset = (int) (pc - base_address);
1818 1818
1819 1819 // Check the PcDesc cache if it contains the desired PcDesc
1820 1820 // (This as an almost 100% hit rate.)
1821 1821 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
1822 1822 if (res != NULL) {
1823 1823 assert(res == linear_search(this, pc_offset, approximate), "cache ok");
1824 1824 return res;
1825 1825 }
1826 1826
1827 1827 // Fallback algorithm: quasi-linear search for the PcDesc
1828 1828 // Find the last pc_offset less than the given offset.
1829 1829 // The successor must be the required match, if there is a match at all.
1830 1830 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
1831 1831 PcDesc* lower = scopes_pcs_begin();
1832 1832 PcDesc* upper = scopes_pcs_end();
1833 1833 upper -= 1; // exclude final sentinel
1834 1834 if (lower >= upper) return NULL; // native method; no PcDescs at all
1835 1835
1836 1836 #define assert_LU_OK \
1837 1837 /* invariant on lower..upper during the following search: */ \
1838 1838 assert(lower->pc_offset() < pc_offset, "sanity"); \
1839 1839 assert(upper->pc_offset() >= pc_offset, "sanity")
1840 1840 assert_LU_OK;
1841 1841
1842 1842 // Use the last successful return as a split point.
1843 1843 PcDesc* mid = _pc_desc_cache.last_pc_desc();
1844 1844 NOT_PRODUCT(++nmethod_stats.pc_desc_searches);
1845 1845 if (mid->pc_offset() < pc_offset) {
1846 1846 lower = mid;
1847 1847 } else {
1848 1848 upper = mid;
1849 1849 }
1850 1850
1851 1851 // Take giant steps at first (4096, then 256, then 16, then 1)
1852 1852 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
1853 1853 const int RADIX = (1 << LOG2_RADIX);
1854 1854 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
1855 1855 while ((mid = lower + step) < upper) {
1856 1856 assert_LU_OK;
1857 1857 NOT_PRODUCT(++nmethod_stats.pc_desc_searches);
1858 1858 if (mid->pc_offset() < pc_offset) {
1859 1859 lower = mid;
1860 1860 } else {
1861 1861 upper = mid;
1862 1862 break;
1863 1863 }
1864 1864 }
1865 1865 assert_LU_OK;
1866 1866 }
1867 1867
1868 1868 // Sneak up on the value with a linear search of length ~16.
1869 1869 while (true) {
1870 1870 assert_LU_OK;
1871 1871 mid = lower + 1;
1872 1872 NOT_PRODUCT(++nmethod_stats.pc_desc_searches);
1873 1873 if (mid->pc_offset() < pc_offset) {
1874 1874 lower = mid;
1875 1875 } else {
1876 1876 upper = mid;
1877 1877 break;
1878 1878 }
1879 1879 }
1880 1880 #undef assert_LU_OK
1881 1881
1882 1882 if (match_desc(upper, pc_offset, approximate)) {
1883 1883 assert(upper == linear_search(this, pc_offset, approximate), "search ok");
1884 1884 _pc_desc_cache.add_pc_desc(upper);
1885 1885 return upper;
1886 1886 } else {
1887 1887 assert(NULL == linear_search(this, pc_offset, approximate), "search ok");
1888 1888 return NULL;
1889 1889 }
1890 1890 }
1891 1891
1892 1892
1893 1893 bool nmethod::check_all_dependencies() {
1894 1894 bool found_check = false;
1895 1895 // wholesale check of all dependencies
1896 1896 for (Dependencies::DepStream deps(this); deps.next(); ) {
1897 1897 if (deps.check_dependency() != NULL) {
1898 1898 found_check = true;
1899 1899 NOT_DEBUG(break);
1900 1900 }
1901 1901 }
1902 1902 return found_check; // tell caller if we found anything
1903 1903 }
1904 1904
1905 1905 bool nmethod::check_dependency_on(DepChange& changes) {
1906 1906 // What has happened:
1907 1907 // 1) a new class dependee has been added
1908 1908 // 2) dependee and all its super classes have been marked
1909 1909 bool found_check = false; // set true if we are upset
1910 1910 for (Dependencies::DepStream deps(this); deps.next(); ) {
1911 1911 // Evaluate only relevant dependencies.
1912 1912 if (deps.spot_check_dependency_at(changes) != NULL) {
1913 1913 found_check = true;
1914 1914 NOT_DEBUG(break);
1915 1915 }
1916 1916 }
1917 1917 return found_check;
1918 1918 }
1919 1919
1920 1920 bool nmethod::is_evol_dependent_on(klassOop dependee) {
1921 1921 instanceKlass *dependee_ik = instanceKlass::cast(dependee);
1922 1922 objArrayOop dependee_methods = dependee_ik->methods();
1923 1923 for (Dependencies::DepStream deps(this); deps.next(); ) {
1924 1924 if (deps.type() == Dependencies::evol_method) {
1925 1925 methodOop method = deps.method_argument(0);
1926 1926 for (int j = 0; j < dependee_methods->length(); j++) {
1927 1927 if ((methodOop) dependee_methods->obj_at(j) == method) {
1928 1928 // RC_TRACE macro has an embedded ResourceMark
1929 1929 RC_TRACE(0x01000000,
1930 1930 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)",
1931 1931 _method->method_holder()->klass_part()->external_name(),
1932 1932 _method->name()->as_C_string(),
1933 1933 _method->signature()->as_C_string(), compile_id(),
1934 1934 method->method_holder()->klass_part()->external_name(),
1935 1935 method->name()->as_C_string(),
1936 1936 method->signature()->as_C_string()));
1937 1937 if (TraceDependencies || LogCompilation)
1938 1938 deps.log_dependency(dependee);
1939 1939 return true;
1940 1940 }
1941 1941 }
1942 1942 }
1943 1943 }
1944 1944 return false;
1945 1945 }
1946 1946
1947 1947 // Called from mark_for_deoptimization, when dependee is invalidated.
1948 1948 bool nmethod::is_dependent_on_method(methodOop dependee) {
1949 1949 for (Dependencies::DepStream deps(this); deps.next(); ) {
1950 1950 if (deps.type() != Dependencies::evol_method)
1951 1951 continue;
1952 1952 methodOop method = deps.method_argument(0);
1953 1953 if (method == dependee) return true;
1954 1954 }
1955 1955 return false;
1956 1956 }
1957 1957
1958 1958
1959 1959 bool nmethod::is_patchable_at(address instr_addr) {
1960 1960 assert (code_contains(instr_addr), "wrong nmethod used");
1961 1961 if (is_zombie()) {
1962 1962 // a zombie may never be patched
1963 1963 return false;
1964 1964 }
1965 1965 return true;
1966 1966 }
1967 1967
1968 1968
1969 1969 address nmethod::continuation_for_implicit_exception(address pc) {
1970 1970 // Exception happened outside inline-cache check code => we are inside
1971 1971 // an active nmethod => use cpc to determine a return address
1972 1972 int exception_offset = pc - instructions_begin();
1973 1973 int cont_offset = ImplicitExceptionTable(this).at( exception_offset );
1974 1974 #ifdef ASSERT
1975 1975 if (cont_offset == 0) {
1976 1976 Thread* thread = ThreadLocalStorage::get_thread_slow();
1977 1977 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
1978 1978 HandleMark hm(thread);
1979 1979 ResourceMark rm(thread);
1980 1980 CodeBlob* cb = CodeCache::find_blob(pc);
1981 1981 assert(cb != NULL && cb == this, "");
1982 1982 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, pc);
1983 1983 print();
1984 1984 method()->print_codes();
1985 1985 print_code();
1986 1986 print_pcs();
1987 1987 }
1988 1988 #endif
1989 1989 guarantee(cont_offset != 0, "unhandled implicit exception in compiled code");
1990 1990 return instructions_begin() + cont_offset;
1991 1991 }
1992 1992
1993 1993
1994 1994
1995 1995 void nmethod_init() {
1996 1996 // make sure you didn't forget to adjust the filler fields
1997 1997 assert(sizeof(nmFlags) <= 4, "nmFlags occupies more than a word");
1998 1998 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
1999 1999 }
2000 2000
2001 2001
2002 2002 //-------------------------------------------------------------------------------------------
2003 2003
2004 2004
2005 2005 // QQQ might we make this work from a frame??
2006 2006 nmethodLocker::nmethodLocker(address pc) {
2007 2007 CodeBlob* cb = CodeCache::find_blob(pc);
2008 2008 guarantee(cb != NULL && cb->is_nmethod(), "bad pc for a nmethod found");
2009 2009 _nm = (nmethod*)cb;
2010 2010 lock_nmethod(_nm);
2011 2011 }
2012 2012
2013 2013 void nmethodLocker::lock_nmethod(nmethod* nm) {
2014 2014 if (nm == NULL) return;
2015 2015 Atomic::inc(&nm->_lock_count);
2016 2016 guarantee(!nm->is_zombie(), "cannot lock a zombie method");
2017 2017 }
2018 2018
2019 2019 void nmethodLocker::unlock_nmethod(nmethod* nm) {
2020 2020 if (nm == NULL) return;
2021 2021 Atomic::dec(&nm->_lock_count);
2022 2022 guarantee(nm->_lock_count >= 0, "unmatched nmethod lock/unlock");
2023 2023 }
2024 2024
2025 2025 bool nmethod::is_deopt_pc(address pc) {
2026 2026 bool ret = pc == deopt_handler_begin();
2027 2027 return ret;
2028 2028 }
2029 2029
2030 2030
2031 2031 // -----------------------------------------------------------------------------
2032 2032 // MethodHandle
2033 2033
2034 2034 bool nmethod::is_method_handle_return(address return_pc) {
2035 2035 if (!has_method_handle_invokes()) return false;
2036 2036 PcDesc* pd = pc_desc_at(return_pc);
2037 2037 if (pd == NULL)
2038 2038 return false;
2039 2039 return pd->is_method_handle_invoke();
2040 2040 }
2041 2041
2042 2042
2043 2043 // -----------------------------------------------------------------------------
2044 2044 // Verification
2045 2045
2046 2046 class VerifyOopsClosure: public OopClosure {
2047 2047 nmethod* _nm;
2048 2048 bool _ok;
2049 2049 public:
2050 2050 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
2051 2051 bool ok() { return _ok; }
2052 2052 virtual void do_oop(oop* p) {
2053 2053 if ((*p) == NULL || (*p)->is_oop()) return;
2054 2054 if (_ok) {
2055 2055 _nm->print_nmethod(true);
2056 2056 _ok = false;
2057 2057 }
2058 2058 tty->print_cr("*** non-oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)",
2059 2059 (intptr_t)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm));
2060 2060 }
2061 2061 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2062 2062 };
2063 2063
2064 2064 void nmethod::verify() {
2065 2065
2066 2066 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant
2067 2067 // seems odd.
2068 2068
2069 2069 if( is_zombie() || is_not_entrant() )
2070 2070 return;
2071 2071
2072 2072 // Make sure all the entry points are correctly aligned for patching.
2073 2073 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
2074 2074
2075 2075 assert(method()->is_oop(), "must be valid");
2076 2076
2077 2077 ResourceMark rm;
2078 2078
2079 2079 if (!CodeCache::contains(this)) {
2080 2080 fatal1("nmethod at " INTPTR_FORMAT " not in zone", this);
2081 2081 }
2082 2082
2083 2083 if(is_native_method() )
2084 2084 return;
2085 2085
2086 2086 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
2087 2087 if (nm != this) {
2088 2088 fatal1("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", this);
2089 2089 }
2090 2090
2091 2091 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2092 2092 if (! p->verify(this)) {
2093 2093 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", this);
2094 2094 }
2095 2095 }
2096 2096
2097 2097 VerifyOopsClosure voc(this);
2098 2098 oops_do(&voc);
2099 2099 assert(voc.ok(), "embedded oops must be OK");
2100 2100 verify_scavenge_root_oops();
2101 2101
2102 2102 verify_scopes();
2103 2103 }
2104 2104
2105 2105
2106 2106 void nmethod::verify_interrupt_point(address call_site) {
2107 2107 // This code does not work in release mode since
2108 2108 // owns_lock only is available in debug mode.
2109 2109 CompiledIC* ic = NULL;
2110 2110 Thread *cur = Thread::current();
2111 2111 if (CompiledIC_lock->owner() == cur ||
2112 2112 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) &&
2113 2113 SafepointSynchronize::is_at_safepoint())) {
2114 2114 ic = CompiledIC_at(call_site);
2115 2115 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
2116 2116 } else {
2117 2117 MutexLocker ml_verify (CompiledIC_lock);
2118 2118 ic = CompiledIC_at(call_site);
2119 2119 }
2120 2120 PcDesc* pd = pc_desc_at(ic->end_of_call());
2121 2121 assert(pd != NULL, "PcDesc must exist");
2122 2122 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(),
2123 2123 pd->obj_decode_offset(), pd->should_reexecute());
2124 2124 !sd->is_top(); sd = sd->sender()) {
2125 2125 sd->verify();
2126 2126 }
2127 2127 }
2128 2128
2129 2129 void nmethod::verify_scopes() {
2130 2130 if( !method() ) return; // Runtime stubs have no scope
2131 2131 if (method()->is_native()) return; // Ignore stub methods.
2132 2132 // iterate through all interrupt point
2133 2133 // and verify the debug information is valid.
2134 2134 RelocIterator iter((nmethod*)this);
2135 2135 while (iter.next()) {
2136 2136 address stub = NULL;
2137 2137 switch (iter.type()) {
2138 2138 case relocInfo::virtual_call_type:
2139 2139 verify_interrupt_point(iter.addr());
2140 2140 break;
2141 2141 case relocInfo::opt_virtual_call_type:
2142 2142 stub = iter.opt_virtual_call_reloc()->static_stub();
2143 2143 verify_interrupt_point(iter.addr());
2144 2144 break;
2145 2145 case relocInfo::static_call_type:
2146 2146 stub = iter.static_call_reloc()->static_stub();
2147 2147 //verify_interrupt_point(iter.addr());
2148 2148 break;
2149 2149 case relocInfo::runtime_call_type:
2150 2150 address destination = iter.reloc()->value();
2151 2151 // Right now there is no way to find out which entries support
2152 2152 // an interrupt point. It would be nice if we had this
2153 2153 // information in a table.
2154 2154 break;
2155 2155 }
2156 2156 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section");
2157 2157 }
2158 2158 }
2159 2159
2160 2160
2161 2161 // -----------------------------------------------------------------------------
2162 2162 // Non-product code
2163 2163 #ifndef PRODUCT
2164 2164
2165 2165 class DebugScavengeRoot: public OopClosure {
2166 2166 nmethod* _nm;
2167 2167 bool _ok;
2168 2168 public:
2169 2169 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { }
2170 2170 bool ok() { return _ok; }
2171 2171 virtual void do_oop(oop* p) {
2172 2172 if ((*p) == NULL || !(*p)->is_scavengable()) return;
2173 2173 if (_ok) {
2174 2174 _nm->print_nmethod(true);
2175 2175 _ok = false;
2176 2176 }
2177 2177 tty->print_cr("*** non-perm oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)",
2178 2178 (intptr_t)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm));
2179 2179 (*p)->print();
2180 2180 }
2181 2181 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2182 2182 };
2183 2183
2184 2184 void nmethod::verify_scavenge_root_oops() {
2185 2185 if (!on_scavenge_root_list()) {
2186 2186 // Actually look inside, to verify the claim that it's clean.
2187 2187 DebugScavengeRoot debug_scavenge_root(this);
2188 2188 oops_do(&debug_scavenge_root);
2189 2189 if (!debug_scavenge_root.ok())
2190 2190 fatal("found an unadvertised bad non-perm oop in the code cache");
2191 2191 }
2192 2192 assert(scavenge_root_not_marked(), "");
2193 2193 }
2194 2194
2195 2195 #endif // PRODUCT
2196 2196
2197 2197 // Printing operations
2198 2198
2199 2199 void nmethod::print() const {
2200 2200 ResourceMark rm;
2201 2201 ttyLocker ttyl; // keep the following output all in one block
2202 2202
2203 2203 tty->print("Compiled ");
2204 2204
2205 2205 if (is_compiled_by_c1()) {
2206 2206 tty->print("(c1) ");
2207 2207 } else if (is_compiled_by_c2()) {
2208 2208 tty->print("(c2) ");
2209 2209 } else {
2210 2210 tty->print("(nm) ");
2211 2211 }
2212 2212
2213 2213 print_on(tty, "nmethod");
2214 2214 tty->cr();
2215 2215 if (WizardMode) {
2216 2216 tty->print("((nmethod*) "INTPTR_FORMAT ") ", this);
2217 2217 tty->print(" for method " INTPTR_FORMAT , (address)method());
2218 2218 tty->print(" { ");
2219 2219 if (version()) tty->print("v%d ", version());
2220 2220 if (level()) tty->print("l%d ", level());
2221 2221 if (is_in_use()) tty->print("in_use ");
2222 2222 if (is_not_entrant()) tty->print("not_entrant ");
2223 2223 if (is_zombie()) tty->print("zombie ");
2224 2224 if (is_unloaded()) tty->print("unloaded ");
2225 2225 if (on_scavenge_root_list()) tty->print("scavenge_root ");
2226 2226 tty->print_cr("}:");
2227 2227 }
2228 2228 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2229 2229 (address)this,
2230 2230 (address)this + size(),
2231 2231 size());
2232 2232 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2233 2233 relocation_begin(),
2234 2234 relocation_end(),
2235 2235 relocation_size());
2236 2236 if (code_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2237 2237 code_begin(),
2238 2238 code_end(),
2239 2239 code_size());
2240 2240 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2241 2241 stub_begin(),
2242 2242 stub_end(),
2243 2243 stub_size());
2244 2244 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2245 2245 consts_begin(),
2246 2246 consts_end(),
2247 2247 consts_size());
2248 2248 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2249 2249 scopes_data_begin(),
2250 2250 scopes_data_end(),
2251 2251 scopes_data_size());
2252 2252 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2253 2253 scopes_pcs_begin(),
2254 2254 scopes_pcs_end(),
2255 2255 scopes_pcs_size());
2256 2256 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2257 2257 dependencies_begin(),
2258 2258 dependencies_end(),
2259 2259 dependencies_size());
2260 2260 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2261 2261 handler_table_begin(),
2262 2262 handler_table_end(),
2263 2263 handler_table_size());
2264 2264 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2265 2265 nul_chk_table_begin(),
2266 2266 nul_chk_table_end(),
2267 2267 nul_chk_table_size());
2268 2268 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2269 2269 oops_begin(),
2270 2270 oops_end(),
2271 2271 oops_size());
2272 2272 }
2273 2273
2274 2274 void nmethod::print_code() {
2275 2275 HandleMark hm;
2276 2276 ResourceMark m;
2277 2277 Disassembler::decode(this);
2278 2278 }
2279 2279
2280 2280
2281 2281 #ifndef PRODUCT
2282 2282
2283 2283 void nmethod::print_scopes() {
2284 2284 // Find the first pc desc for all scopes in the code and print it.
2285 2285 ResourceMark rm;
2286 2286 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2287 2287 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
2288 2288 continue;
2289 2289
2290 2290 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
2291 2291 sd->print_on(tty, p);
2292 2292 }
2293 2293 }
2294 2294
2295 2295 void nmethod::print_dependencies() {
2296 2296 ResourceMark rm;
2297 2297 ttyLocker ttyl; // keep the following output all in one block
2298 2298 tty->print_cr("Dependencies:");
2299 2299 for (Dependencies::DepStream deps(this); deps.next(); ) {
2300 2300 deps.print_dependency();
2301 2301 klassOop ctxk = deps.context_type();
2302 2302 if (ctxk != NULL) {
2303 2303 Klass* k = Klass::cast(ctxk);
2304 2304 if (k->oop_is_instance() && ((instanceKlass*)k)->is_dependent_nmethod(this)) {
2305 2305 tty->print_cr(" [nmethod<=klass]%s", k->external_name());
2306 2306 }
2307 2307 }
2308 2308 deps.log_dependency(); // put it into the xml log also
2309 2309 }
2310 2310 }
2311 2311
2312 2312
2313 2313 void nmethod::print_relocations() {
2314 2314 ResourceMark m; // in case methods get printed via the debugger
2315 2315 tty->print_cr("relocations:");
2316 2316 RelocIterator iter(this);
2317 2317 iter.print();
2318 2318 if (UseRelocIndex) {
2319 2319 jint* index_end = (jint*)relocation_end() - 1;
2320 2320 jint index_size = *index_end;
2321 2321 jint* index_start = (jint*)( (address)index_end - index_size );
2322 2322 tty->print_cr(" index @" INTPTR_FORMAT ": index_size=%d", index_start, index_size);
2323 2323 if (index_size > 0) {
2324 2324 jint* ip;
2325 2325 for (ip = index_start; ip+2 <= index_end; ip += 2)
2326 2326 tty->print_cr(" (%d %d) addr=" INTPTR_FORMAT " @" INTPTR_FORMAT,
2327 2327 ip[0],
2328 2328 ip[1],
2329 2329 header_end()+ip[0],
2330 2330 relocation_begin()-1+ip[1]);
2331 2331 for (; ip < index_end; ip++)
2332 2332 tty->print_cr(" (%d ?)", ip[0]);
2333 2333 tty->print_cr(" @" INTPTR_FORMAT ": index_size=%d", ip, *ip++);
2334 2334 tty->print_cr("reloc_end @" INTPTR_FORMAT ":", ip);
2335 2335 }
2336 2336 }
2337 2337 }
2338 2338
2339 2339
2340 2340 void nmethod::print_pcs() {
2341 2341 ResourceMark m; // in case methods get printed via debugger
2342 2342 tty->print_cr("pc-bytecode offsets:");
2343 2343 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2344 2344 p->print(this);
2345 2345 }
2346 2346 }
2347 2347
2348 2348 #endif // PRODUCT
2349 2349
2350 2350 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
2351 2351 RelocIterator iter(this, begin, end);
2352 2352 bool have_one = false;
2353 2353 while (iter.next()) {
2354 2354 have_one = true;
2355 2355 switch (iter.type()) {
2356 2356 case relocInfo::none: return "no_reloc";
2357 2357 case relocInfo::oop_type: {
2358 2358 stringStream st;
2359 2359 oop_Relocation* r = iter.oop_reloc();
2360 2360 oop obj = r->oop_value();
2361 2361 st.print("oop(");
2362 2362 if (obj == NULL) st.print("NULL");
2363 2363 else obj->print_value_on(&st);
2364 2364 st.print(")");
2365 2365 return st.as_string();
2366 2366 }
2367 2367 case relocInfo::virtual_call_type: return "virtual_call";
2368 2368 case relocInfo::opt_virtual_call_type: return "optimized virtual_call";
2369 2369 case relocInfo::static_call_type: return "static_call";
2370 2370 case relocInfo::static_stub_type: return "static_stub";
2371 2371 case relocInfo::runtime_call_type: return "runtime_call";
2372 2372 case relocInfo::external_word_type: return "external_word";
2373 2373 case relocInfo::internal_word_type: return "internal_word";
2374 2374 case relocInfo::section_word_type: return "section_word";
2375 2375 case relocInfo::poll_type: return "poll";
2376 2376 case relocInfo::poll_return_type: return "poll_return";
2377 2377 case relocInfo::type_mask: return "type_bit_mask";
2378 2378 }
2379 2379 }
2380 2380 return have_one ? "other" : NULL;
2381 2381 }
2382 2382
2383 2383 // Return a the last scope in (begin..end]
2384 2384 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
2385 2385 PcDesc* p = pc_desc_near(begin+1);
2386 2386 if (p != NULL && p->real_pc(this) <= end) {
2387 2387 return new ScopeDesc(this, p->scope_decode_offset(),
2388 2388 p->obj_decode_offset(), p->should_reexecute());
2389 2389 }
2390 2390 return NULL;
2391 2391 }
2392 2392
2393 2393 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) {
2394 2394 // First, find an oopmap in (begin, end].
2395 2395 // We use the odd half-closed interval so that oop maps and scope descs
2396 2396 // which are tied to the byte after a call are printed with the call itself.
2397 2397 address base = instructions_begin();
2398 2398 OopMapSet* oms = oop_maps();
2399 2399 if (oms != NULL) {
2400 2400 for (int i = 0, imax = oms->size(); i < imax; i++) {
2401 2401 OopMap* om = oms->at(i);
2402 2402 address pc = base + om->offset();
2403 2403 if (pc > begin) {
2404 2404 if (pc <= end) {
2405 2405 st->move_to(column);
2406 2406 st->print("; ");
2407 2407 om->print_on(st);
2408 2408 }
2409 2409 break;
2410 2410 }
2411 2411 }
2412 2412 }
2413 2413
2414 2414 // Print any debug info present at this pc.
2415 2415 ScopeDesc* sd = scope_desc_in(begin, end);
2416 2416 if (sd != NULL) {
2417 2417 st->move_to(column);
2418 2418 if (sd->bci() == SynchronizationEntryBCI) {
2419 2419 st->print(";*synchronization entry");
2420 2420 } else {
2421 2421 if (sd->method().is_null()) {
2422 2422 st->print("method is NULL");
2423 2423 } else if (sd->method()->is_native()) {
2424 2424 st->print("method is native");
2425 2425 } else {
2426 2426 address bcp = sd->method()->bcp_from(sd->bci());
2427 2427 Bytecodes::Code bc = Bytecodes::java_code_at(bcp);
2428 2428 st->print(";*%s", Bytecodes::name(bc));
2429 2429 switch (bc) {
2430 2430 case Bytecodes::_invokevirtual:
2431 2431 case Bytecodes::_invokespecial:
2432 2432 case Bytecodes::_invokestatic:
2433 2433 case Bytecodes::_invokeinterface:
2434 2434 {
2435 2435 Bytecode_invoke* invoke = Bytecode_invoke_at(sd->method(), sd->bci());
2436 2436 st->print(" ");
2437 2437 if (invoke->name() != NULL)
2438 2438 invoke->name()->print_symbol_on(st);
2439 2439 else
2440 2440 st->print("<UNKNOWN>");
2441 2441 break;
2442 2442 }
2443 2443 case Bytecodes::_getfield:
2444 2444 case Bytecodes::_putfield:
2445 2445 case Bytecodes::_getstatic:
2446 2446 case Bytecodes::_putstatic:
2447 2447 {
2448 2448 methodHandle sdm = sd->method();
2449 2449 Bytecode_field* field = Bytecode_field_at(sdm(), sdm->bcp_from(sd->bci()));
2450 2450 constantPoolOop sdmc = sdm->constants();
2451 2451 symbolOop name = sdmc->name_ref_at(field->index());
2452 2452 st->print(" ");
2453 2453 if (name != NULL)
2454 2454 name->print_symbol_on(st);
2455 2455 else
2456 2456 st->print("<UNKNOWN>");
2457 2457 }
2458 2458 }
2459 2459 }
2460 2460 }
2461 2461
2462 2462 // Print all scopes
2463 2463 for (;sd != NULL; sd = sd->sender()) {
2464 2464 st->move_to(column);
2465 2465 st->print("; -");
2466 2466 if (sd->method().is_null()) {
2467 2467 st->print("method is NULL");
2468 2468 } else {
2469 2469 sd->method()->print_short_name(st);
2470 2470 }
2471 2471 int lineno = sd->method()->line_number_from_bci(sd->bci());
2472 2472 if (lineno != -1) {
2473 2473 st->print("@%d (line %d)", sd->bci(), lineno);
2474 2474 } else {
2475 2475 st->print("@%d", sd->bci());
2476 2476 }
2477 2477 st->cr();
2478 2478 }
2479 2479 }
2480 2480
2481 2481 // Print relocation information
2482 2482 const char* str = reloc_string_for(begin, end);
2483 2483 if (str != NULL) {
2484 2484 if (sd != NULL) st->cr();
2485 2485 st->move_to(column);
2486 2486 st->print("; {%s}", str);
2487 2487 }
2488 2488 int cont_offset = ImplicitExceptionTable(this).at(begin - instructions_begin());
2489 2489 if (cont_offset != 0) {
2490 2490 st->move_to(column);
2491 2491 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, instructions_begin() + cont_offset);
2492 2492 }
2493 2493
2494 2494 }
2495 2495
2496 2496 #ifndef PRODUCT
2497 2497
2498 2498 void nmethod::print_value_on(outputStream* st) const {
2499 2499 print_on(st, "nmethod");
2500 2500 }
2501 2501
2502 2502 void nmethod::print_calls(outputStream* st) {
2503 2503 RelocIterator iter(this);
2504 2504 while (iter.next()) {
2505 2505 switch (iter.type()) {
2506 2506 case relocInfo::virtual_call_type:
2507 2507 case relocInfo::opt_virtual_call_type: {
2508 2508 VerifyMutexLocker mc(CompiledIC_lock);
2509 2509 CompiledIC_at(iter.reloc())->print();
2510 2510 break;
2511 2511 }
2512 2512 case relocInfo::static_call_type:
2513 2513 st->print_cr("Static call at " INTPTR_FORMAT, iter.reloc()->addr());
2514 2514 compiledStaticCall_at(iter.reloc())->print();
2515 2515 break;
2516 2516 }
2517 2517 }
2518 2518 }
2519 2519
2520 2520 void nmethod::print_handler_table() {
2521 2521 ExceptionHandlerTable(this).print();
2522 2522 }
2523 2523
2524 2524 void nmethod::print_nul_chk_table() {
2525 2525 ImplicitExceptionTable(this).print(instructions_begin());
2526 2526 }
2527 2527
2528 2528 void nmethod::print_statistics() {
2529 2529 ttyLocker ttyl;
2530 2530 if (xtty != NULL) xtty->head("statistics type='nmethod'");
2531 2531 nmethod_stats.print_native_nmethod_stats();
2532 2532 nmethod_stats.print_nmethod_stats();
2533 2533 DebugInformationRecorder::print_statistics();
2534 2534 nmethod_stats.print_pc_stats();
2535 2535 Dependencies::print_statistics();
2536 2536 if (xtty != NULL) xtty->tail("statistics");
2537 2537 }
2538 2538
2539 2539 #endif // PRODUCT
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