Mercurial > hg > truffle
annotate src/share/vm/code/nmethod.cpp @ 994:753cf9794df9
6885169: merge of 4957990 and 6863023 causes conflict on do_nmethods
Summary: After mechanically merging changes, some by-hand adjustments are needed.
Reviewed-by: ysr
author | jrose |
---|---|
date | Wed, 23 Sep 2009 23:57:44 -0700 |
parents | 54b3b351d6f9 |
children | 032260830071 |
rev | line source |
---|---|
0 | 1 /* |
931
72088be4b386
6873116: Modify reexecute implementation to use pcDesc to record the reexecute bit
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2 * Copyright 1997-2009 Sun Microsystems, Inc. All Rights Reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 # include "incls/_precompiled.incl" | |
26 # include "incls/_nmethod.cpp.incl" | |
27 | |
28 #ifdef DTRACE_ENABLED | |
29 | |
30 // Only bother with this argument setup if dtrace is available | |
31 | |
32 HS_DTRACE_PROBE_DECL8(hotspot, compiled__method__load, | |
33 const char*, int, const char*, int, const char*, int, void*, size_t); | |
34 | |
35 HS_DTRACE_PROBE_DECL6(hotspot, compiled__method__unload, | |
36 char*, int, char*, int, char*, int); | |
37 | |
38 #define DTRACE_METHOD_UNLOAD_PROBE(method) \ | |
39 { \ | |
40 methodOop m = (method); \ | |
41 if (m != NULL) { \ | |
42 symbolOop klass_name = m->klass_name(); \ | |
43 symbolOop name = m->name(); \ | |
44 symbolOop signature = m->signature(); \ | |
45 HS_DTRACE_PROBE6(hotspot, compiled__method__unload, \ | |
46 klass_name->bytes(), klass_name->utf8_length(), \ | |
47 name->bytes(), name->utf8_length(), \ | |
48 signature->bytes(), signature->utf8_length()); \ | |
49 } \ | |
50 } | |
51 | |
52 #else // ndef DTRACE_ENABLED | |
53 | |
54 #define DTRACE_METHOD_UNLOAD_PROBE(method) | |
55 | |
56 #endif | |
57 | |
58 bool nmethod::is_compiled_by_c1() const { | |
59 if (is_native_method()) return false; | |
60 assert(compiler() != NULL, "must be"); | |
61 return compiler()->is_c1(); | |
62 } | |
63 bool nmethod::is_compiled_by_c2() const { | |
64 if (is_native_method()) return false; | |
65 assert(compiler() != NULL, "must be"); | |
66 return compiler()->is_c2(); | |
67 } | |
68 | |
69 | |
70 | |
71 //--------------------------------------------------------------------------------- | |
72 // NMethod statistics | |
73 // They are printed under various flags, including: | |
74 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation. | |
75 // (In the latter two cases, they like other stats are printed to the log only.) | |
76 | |
77 #ifndef PRODUCT | |
78 // These variables are put into one block to reduce relocations | |
79 // and make it simpler to print from the debugger. | |
80 static | |
81 struct nmethod_stats_struct { | |
82 int nmethod_count; | |
83 int total_size; | |
84 int relocation_size; | |
85 int code_size; | |
86 int stub_size; | |
87 int consts_size; | |
88 int scopes_data_size; | |
89 int scopes_pcs_size; | |
90 int dependencies_size; | |
91 int handler_table_size; | |
92 int nul_chk_table_size; | |
93 int oops_size; | |
94 | |
95 void note_nmethod(nmethod* nm) { | |
96 nmethod_count += 1; | |
97 total_size += nm->size(); | |
98 relocation_size += nm->relocation_size(); | |
99 code_size += nm->code_size(); | |
100 stub_size += nm->stub_size(); | |
101 consts_size += nm->consts_size(); | |
102 scopes_data_size += nm->scopes_data_size(); | |
103 scopes_pcs_size += nm->scopes_pcs_size(); | |
104 dependencies_size += nm->dependencies_size(); | |
105 handler_table_size += nm->handler_table_size(); | |
106 nul_chk_table_size += nm->nul_chk_table_size(); | |
107 oops_size += nm->oops_size(); | |
108 } | |
109 void print_nmethod_stats() { | |
110 if (nmethod_count == 0) return; | |
111 tty->print_cr("Statistics for %d bytecoded nmethods:", nmethod_count); | |
112 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size); | |
113 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size); | |
114 if (code_size != 0) tty->print_cr(" main code = %d", code_size); | |
115 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size); | |
116 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size); | |
117 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size); | |
118 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size); | |
119 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size); | |
120 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size); | |
121 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size); | |
122 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size); | |
123 } | |
124 | |
125 int native_nmethod_count; | |
126 int native_total_size; | |
127 int native_relocation_size; | |
128 int native_code_size; | |
129 int native_oops_size; | |
130 void note_native_nmethod(nmethod* nm) { | |
131 native_nmethod_count += 1; | |
132 native_total_size += nm->size(); | |
133 native_relocation_size += nm->relocation_size(); | |
134 native_code_size += nm->code_size(); | |
135 native_oops_size += nm->oops_size(); | |
136 } | |
137 void print_native_nmethod_stats() { | |
138 if (native_nmethod_count == 0) return; | |
139 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count); | |
140 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size); | |
141 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size); | |
142 if (native_code_size != 0) tty->print_cr(" N. main code = %d", native_code_size); | |
143 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size); | |
144 } | |
145 | |
146 int pc_desc_resets; // number of resets (= number of caches) | |
147 int pc_desc_queries; // queries to nmethod::find_pc_desc | |
148 int pc_desc_approx; // number of those which have approximate true | |
149 int pc_desc_repeats; // number of _last_pc_desc hits | |
150 int pc_desc_hits; // number of LRU cache hits | |
151 int pc_desc_tests; // total number of PcDesc examinations | |
152 int pc_desc_searches; // total number of quasi-binary search steps | |
153 int pc_desc_adds; // number of LUR cache insertions | |
154 | |
155 void print_pc_stats() { | |
156 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query", | |
157 pc_desc_queries, | |
158 (double)(pc_desc_tests + pc_desc_searches) | |
159 / pc_desc_queries); | |
160 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d", | |
161 pc_desc_resets, | |
162 pc_desc_queries, pc_desc_approx, | |
163 pc_desc_repeats, pc_desc_hits, | |
164 pc_desc_tests, pc_desc_searches, pc_desc_adds); | |
165 } | |
166 } nmethod_stats; | |
167 #endif //PRODUCT | |
168 | |
169 //--------------------------------------------------------------------------------- | |
170 | |
171 | |
172 // The _unwind_handler is a special marker address, which says that | |
173 // for given exception oop and address, the frame should be removed | |
174 // as the tuple cannot be caught in the nmethod | |
175 address ExceptionCache::_unwind_handler = (address) -1; | |
176 | |
177 | |
178 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) { | |
179 assert(pc != NULL, "Must be non null"); | |
180 assert(exception.not_null(), "Must be non null"); | |
181 assert(handler != NULL, "Must be non null"); | |
182 | |
183 _count = 0; | |
184 _exception_type = exception->klass(); | |
185 _next = NULL; | |
186 | |
187 add_address_and_handler(pc,handler); | |
188 } | |
189 | |
190 | |
191 address ExceptionCache::match(Handle exception, address pc) { | |
192 assert(pc != NULL,"Must be non null"); | |
193 assert(exception.not_null(),"Must be non null"); | |
194 if (exception->klass() == exception_type()) { | |
195 return (test_address(pc)); | |
196 } | |
197 | |
198 return NULL; | |
199 } | |
200 | |
201 | |
202 bool ExceptionCache::match_exception_with_space(Handle exception) { | |
203 assert(exception.not_null(),"Must be non null"); | |
204 if (exception->klass() == exception_type() && count() < cache_size) { | |
205 return true; | |
206 } | |
207 return false; | |
208 } | |
209 | |
210 | |
211 address ExceptionCache::test_address(address addr) { | |
212 for (int i=0; i<count(); i++) { | |
213 if (pc_at(i) == addr) { | |
214 return handler_at(i); | |
215 } | |
216 } | |
217 return NULL; | |
218 } | |
219 | |
220 | |
221 bool ExceptionCache::add_address_and_handler(address addr, address handler) { | |
222 if (test_address(addr) == handler) return true; | |
223 if (count() < cache_size) { | |
224 set_pc_at(count(),addr); | |
225 set_handler_at(count(), handler); | |
226 increment_count(); | |
227 return true; | |
228 } | |
229 return false; | |
230 } | |
231 | |
232 | |
233 // private method for handling exception cache | |
234 // These methods are private, and used to manipulate the exception cache | |
235 // directly. | |
236 ExceptionCache* nmethod::exception_cache_entry_for_exception(Handle exception) { | |
237 ExceptionCache* ec = exception_cache(); | |
238 while (ec != NULL) { | |
239 if (ec->match_exception_with_space(exception)) { | |
240 return ec; | |
241 } | |
242 ec = ec->next(); | |
243 } | |
244 return NULL; | |
245 } | |
246 | |
247 | |
248 //----------------------------------------------------------------------------- | |
249 | |
250 | |
251 // Helper used by both find_pc_desc methods. | |
252 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) { | |
253 NOT_PRODUCT(++nmethod_stats.pc_desc_tests); | |
254 if (!approximate) | |
255 return pc->pc_offset() == pc_offset; | |
256 else | |
257 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset(); | |
258 } | |
259 | |
260 void PcDescCache::reset_to(PcDesc* initial_pc_desc) { | |
261 if (initial_pc_desc == NULL) { | |
262 _last_pc_desc = NULL; // native method | |
263 return; | |
264 } | |
265 NOT_PRODUCT(++nmethod_stats.pc_desc_resets); | |
266 // reset the cache by filling it with benign (non-null) values | |
267 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel"); | |
268 _last_pc_desc = initial_pc_desc + 1; // first valid one is after sentinel | |
269 for (int i = 0; i < cache_size; i++) | |
270 _pc_descs[i] = initial_pc_desc; | |
271 } | |
272 | |
273 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) { | |
274 NOT_PRODUCT(++nmethod_stats.pc_desc_queries); | |
275 NOT_PRODUCT(if (approximate) ++nmethod_stats.pc_desc_approx); | |
276 | |
277 // In order to prevent race conditions do not load cache elements | |
278 // repeatedly, but use a local copy: | |
279 PcDesc* res; | |
280 | |
281 // Step one: Check the most recently returned value. | |
282 res = _last_pc_desc; | |
283 if (res == NULL) return NULL; // native method; no PcDescs at all | |
284 if (match_desc(res, pc_offset, approximate)) { | |
285 NOT_PRODUCT(++nmethod_stats.pc_desc_repeats); | |
286 return res; | |
287 } | |
288 | |
289 // Step two: Check the LRU cache. | |
290 for (int i = 0; i < cache_size; i++) { | |
291 res = _pc_descs[i]; | |
292 if (res->pc_offset() < 0) break; // optimization: skip empty cache | |
293 if (match_desc(res, pc_offset, approximate)) { | |
294 NOT_PRODUCT(++nmethod_stats.pc_desc_hits); | |
295 _last_pc_desc = res; // record this cache hit in case of repeat | |
296 return res; | |
297 } | |
298 } | |
299 | |
300 // Report failure. | |
301 return NULL; | |
302 } | |
303 | |
304 void PcDescCache::add_pc_desc(PcDesc* pc_desc) { | |
305 NOT_PRODUCT(++nmethod_stats.pc_desc_adds); | |
306 // Update the LRU cache by shifting pc_desc forward: | |
307 for (int i = 0; i < cache_size; i++) { | |
308 PcDesc* next = _pc_descs[i]; | |
309 _pc_descs[i] = pc_desc; | |
310 pc_desc = next; | |
311 } | |
312 // Note: Do not update _last_pc_desc. It fronts for the LRU cache. | |
313 } | |
314 | |
315 // adjust pcs_size so that it is a multiple of both oopSize and | |
316 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple | |
317 // of oopSize, then 2*sizeof(PcDesc) is) | |
318 static int adjust_pcs_size(int pcs_size) { | |
319 int nsize = round_to(pcs_size, oopSize); | |
320 if ((nsize % sizeof(PcDesc)) != 0) { | |
321 nsize = pcs_size + sizeof(PcDesc); | |
322 } | |
323 assert((nsize % oopSize) == 0, "correct alignment"); | |
324 return nsize; | |
325 } | |
326 | |
327 //----------------------------------------------------------------------------- | |
328 | |
329 | |
330 void nmethod::add_exception_cache_entry(ExceptionCache* new_entry) { | |
331 assert(ExceptionCache_lock->owned_by_self(),"Must hold the ExceptionCache_lock"); | |
332 assert(new_entry != NULL,"Must be non null"); | |
333 assert(new_entry->next() == NULL, "Must be null"); | |
334 | |
335 if (exception_cache() != NULL) { | |
336 new_entry->set_next(exception_cache()); | |
337 } | |
338 set_exception_cache(new_entry); | |
339 } | |
340 | |
341 void nmethod::remove_from_exception_cache(ExceptionCache* ec) { | |
342 ExceptionCache* prev = NULL; | |
343 ExceptionCache* curr = exception_cache(); | |
344 assert(curr != NULL, "nothing to remove"); | |
345 // find the previous and next entry of ec | |
346 while (curr != ec) { | |
347 prev = curr; | |
348 curr = curr->next(); | |
349 assert(curr != NULL, "ExceptionCache not found"); | |
350 } | |
351 // now: curr == ec | |
352 ExceptionCache* next = curr->next(); | |
353 if (prev == NULL) { | |
354 set_exception_cache(next); | |
355 } else { | |
356 prev->set_next(next); | |
357 } | |
358 delete curr; | |
359 } | |
360 | |
361 | |
362 // public method for accessing the exception cache | |
363 // These are the public access methods. | |
364 address nmethod::handler_for_exception_and_pc(Handle exception, address pc) { | |
365 // We never grab a lock to read the exception cache, so we may | |
366 // have false negatives. This is okay, as it can only happen during | |
367 // the first few exception lookups for a given nmethod. | |
368 ExceptionCache* ec = exception_cache(); | |
369 while (ec != NULL) { | |
370 address ret_val; | |
371 if ((ret_val = ec->match(exception,pc)) != NULL) { | |
372 return ret_val; | |
373 } | |
374 ec = ec->next(); | |
375 } | |
376 return NULL; | |
377 } | |
378 | |
379 | |
380 void nmethod::add_handler_for_exception_and_pc(Handle exception, address pc, address handler) { | |
381 // There are potential race conditions during exception cache updates, so we | |
382 // must own the ExceptionCache_lock before doing ANY modifications. Because | |
605 | 383 // we don't lock during reads, it is possible to have several threads attempt |
0 | 384 // to update the cache with the same data. We need to check for already inserted |
385 // copies of the current data before adding it. | |
386 | |
387 MutexLocker ml(ExceptionCache_lock); | |
388 ExceptionCache* target_entry = exception_cache_entry_for_exception(exception); | |
389 | |
390 if (target_entry == NULL || !target_entry->add_address_and_handler(pc,handler)) { | |
391 target_entry = new ExceptionCache(exception,pc,handler); | |
392 add_exception_cache_entry(target_entry); | |
393 } | |
394 } | |
395 | |
396 | |
397 //-------------end of code for ExceptionCache-------------- | |
398 | |
399 | |
400 void nmFlags::clear() { | |
401 assert(sizeof(nmFlags) == sizeof(int), "using more than one word for nmFlags"); | |
402 *(jint*)this = 0; | |
403 } | |
404 | |
405 int nmethod::total_size() const { | |
406 return | |
407 code_size() + | |
408 stub_size() + | |
409 consts_size() + | |
410 scopes_data_size() + | |
411 scopes_pcs_size() + | |
412 handler_table_size() + | |
413 nul_chk_table_size(); | |
414 } | |
415 | |
416 const char* nmethod::compile_kind() const { | |
417 if (method() == NULL) return "unloaded"; | |
418 if (is_native_method()) return "c2n"; | |
419 if (is_osr_method()) return "osr"; | |
420 return NULL; | |
421 } | |
422 | |
423 // %%% This variable is no longer used? | |
424 int nmethod::_zombie_instruction_size = NativeJump::instruction_size; | |
425 | |
426 | |
427 nmethod* nmethod::new_native_nmethod(methodHandle method, | |
428 CodeBuffer *code_buffer, | |
429 int vep_offset, | |
430 int frame_complete, | |
431 int frame_size, | |
432 ByteSize basic_lock_owner_sp_offset, | |
433 ByteSize basic_lock_sp_offset, | |
434 OopMapSet* oop_maps) { | |
435 // create nmethod | |
436 nmethod* nm = NULL; | |
437 { | |
438 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); | |
439 int native_nmethod_size = allocation_size(code_buffer, sizeof(nmethod)); | |
440 CodeOffsets offsets; | |
441 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset); | |
442 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete); | |
443 nm = new (native_nmethod_size) | |
444 nmethod(method(), native_nmethod_size, &offsets, | |
445 code_buffer, frame_size, | |
446 basic_lock_owner_sp_offset, basic_lock_sp_offset, | |
447 oop_maps); | |
448 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_native_nmethod(nm)); | |
449 if (PrintAssembly && nm != NULL) | |
450 Disassembler::decode(nm); | |
451 } | |
452 // verify nmethod | |
453 debug_only(if (nm) nm->verify();) // might block | |
454 | |
455 if (nm != NULL) { | |
456 nm->log_new_nmethod(); | |
457 } | |
458 | |
459 return nm; | |
460 } | |
461 | |
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462 #ifdef HAVE_DTRACE_H |
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463 nmethod* nmethod::new_dtrace_nmethod(methodHandle method, |
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464 CodeBuffer *code_buffer, |
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465 int vep_offset, |
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466 int trap_offset, |
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467 int frame_complete, |
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468 int frame_size) { |
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469 // create nmethod |
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470 nmethod* nm = NULL; |
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471 { |
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472 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); |
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473 int nmethod_size = allocation_size(code_buffer, sizeof(nmethod)); |
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474 CodeOffsets offsets; |
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475 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset); |
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476 offsets.set_value(CodeOffsets::Dtrace_trap, trap_offset); |
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477 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete); |
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478 |
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479 nm = new (nmethod_size) nmethod(method(), nmethod_size, &offsets, code_buffer, frame_size); |
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480 |
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481 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_nmethod(nm)); |
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482 if (PrintAssembly && nm != NULL) |
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483 Disassembler::decode(nm); |
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484 } |
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485 // verify nmethod |
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486 debug_only(if (nm) nm->verify();) // might block |
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487 |
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488 if (nm != NULL) { |
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489 nm->log_new_nmethod(); |
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490 } |
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491 |
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492 return nm; |
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493 } |
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494 |
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495 #endif // def HAVE_DTRACE_H |
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496 |
0 | 497 nmethod* nmethod::new_nmethod(methodHandle method, |
498 int compile_id, | |
499 int entry_bci, | |
500 CodeOffsets* offsets, | |
501 int orig_pc_offset, | |
502 DebugInformationRecorder* debug_info, | |
503 Dependencies* dependencies, | |
504 CodeBuffer* code_buffer, int frame_size, | |
505 OopMapSet* oop_maps, | |
506 ExceptionHandlerTable* handler_table, | |
507 ImplicitExceptionTable* nul_chk_table, | |
508 AbstractCompiler* compiler, | |
509 int comp_level | |
510 ) | |
511 { | |
512 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); | |
513 // create nmethod | |
514 nmethod* nm = NULL; | |
515 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); | |
516 int nmethod_size = | |
517 allocation_size(code_buffer, sizeof(nmethod)) | |
518 + adjust_pcs_size(debug_info->pcs_size()) | |
519 + round_to(dependencies->size_in_bytes() , oopSize) | |
520 + round_to(handler_table->size_in_bytes(), oopSize) | |
521 + round_to(nul_chk_table->size_in_bytes(), oopSize) | |
522 + round_to(debug_info->data_size() , oopSize); | |
523 nm = new (nmethod_size) | |
524 nmethod(method(), nmethod_size, compile_id, entry_bci, offsets, | |
525 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size, | |
526 oop_maps, | |
527 handler_table, | |
528 nul_chk_table, | |
529 compiler, | |
530 comp_level); | |
531 if (nm != NULL) { | |
532 // To make dependency checking during class loading fast, record | |
533 // the nmethod dependencies in the classes it is dependent on. | |
534 // This allows the dependency checking code to simply walk the | |
535 // class hierarchy above the loaded class, checking only nmethods | |
536 // which are dependent on those classes. The slow way is to | |
537 // check every nmethod for dependencies which makes it linear in | |
538 // the number of methods compiled. For applications with a lot | |
539 // classes the slow way is too slow. | |
540 for (Dependencies::DepStream deps(nm); deps.next(); ) { | |
541 klassOop klass = deps.context_type(); | |
542 if (klass == NULL) continue; // ignore things like evol_method | |
543 | |
544 // record this nmethod as dependent on this klass | |
545 instanceKlass::cast(klass)->add_dependent_nmethod(nm); | |
546 } | |
547 } | |
548 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_nmethod(nm)); | |
549 if (PrintAssembly && nm != NULL) | |
550 Disassembler::decode(nm); | |
551 } | |
552 | |
553 // verify nmethod | |
554 debug_only(if (nm) nm->verify();) // might block | |
555 | |
556 if (nm != NULL) { | |
557 nm->log_new_nmethod(); | |
558 } | |
559 | |
560 // done | |
561 return nm; | |
562 } | |
563 | |
564 | |
565 // For native wrappers | |
566 nmethod::nmethod( | |
567 methodOop method, | |
568 int nmethod_size, | |
569 CodeOffsets* offsets, | |
570 CodeBuffer* code_buffer, | |
571 int frame_size, | |
572 ByteSize basic_lock_owner_sp_offset, | |
573 ByteSize basic_lock_sp_offset, | |
574 OopMapSet* oop_maps ) | |
575 : CodeBlob("native nmethod", code_buffer, sizeof(nmethod), | |
576 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps), | |
577 _compiled_synchronized_native_basic_lock_owner_sp_offset(basic_lock_owner_sp_offset), | |
578 _compiled_synchronized_native_basic_lock_sp_offset(basic_lock_sp_offset) | |
579 { | |
580 { | |
581 debug_only(No_Safepoint_Verifier nsv;) | |
582 assert_locked_or_safepoint(CodeCache_lock); | |
583 | |
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584 NOT_PRODUCT(_has_debug_info = false); |
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585 _oops_do_mark_link = NULL; |
0 | 586 _method = method; |
587 _entry_bci = InvocationEntryBci; | |
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588 _osr_link = NULL; |
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589 _scavenge_root_link = NULL; |
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590 _scavenge_root_state = 0; |
0 | 591 _compiler = NULL; |
592 // We have no exception handler or deopt handler make the | |
593 // values something that will never match a pc like the nmethod vtable entry | |
594 _exception_offset = 0; | |
595 _deoptimize_offset = 0; | |
596 _orig_pc_offset = 0; | |
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597 #ifdef HAVE_DTRACE_H |
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598 _trap_offset = 0; |
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599 #endif // def HAVE_DTRACE_H |
0 | 600 _stub_offset = data_offset(); |
601 _consts_offset = data_offset(); | |
602 _scopes_data_offset = data_offset(); | |
603 _scopes_pcs_offset = _scopes_data_offset; | |
604 _dependencies_offset = _scopes_pcs_offset; | |
605 _handler_table_offset = _dependencies_offset; | |
606 _nul_chk_table_offset = _handler_table_offset; | |
607 _nmethod_end_offset = _nul_chk_table_offset; | |
608 _compile_id = 0; // default | |
609 _comp_level = CompLevel_none; | |
610 _entry_point = instructions_begin(); | |
611 _verified_entry_point = instructions_begin() + offsets->value(CodeOffsets::Verified_Entry); | |
612 _osr_entry_point = NULL; | |
613 _exception_cache = NULL; | |
614 _pc_desc_cache.reset_to(NULL); | |
615 | |
616 flags.clear(); | |
617 flags.state = alive; | |
618 _markedForDeoptimization = 0; | |
619 | |
620 _lock_count = 0; | |
621 _stack_traversal_mark = 0; | |
622 | |
623 code_buffer->copy_oops_to(this); | |
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624 debug_only(verify_scavenge_root_oops()); |
0 | 625 CodeCache::commit(this); |
626 VTune::create_nmethod(this); | |
627 } | |
628 | |
629 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) { | |
630 ttyLocker ttyl; // keep the following output all in one block | |
631 // This output goes directly to the tty, not the compiler log. | |
632 // To enable tools to match it up with the compilation activity, | |
633 // be sure to tag this tty output with the compile ID. | |
634 if (xtty != NULL) { | |
635 xtty->begin_head("print_native_nmethod"); | |
636 xtty->method(_method); | |
637 xtty->stamp(); | |
638 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this); | |
639 } | |
640 // print the header part first | |
641 print(); | |
642 // then print the requested information | |
643 if (PrintNativeNMethods) { | |
644 print_code(); | |
645 oop_maps->print(); | |
646 } | |
647 if (PrintRelocations) { | |
648 print_relocations(); | |
649 } | |
650 if (xtty != NULL) { | |
651 xtty->tail("print_native_nmethod"); | |
652 } | |
653 } | |
654 Events::log("Create nmethod " INTPTR_FORMAT, this); | |
655 } | |
656 | |
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657 // For dtrace wrappers |
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658 #ifdef HAVE_DTRACE_H |
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659 nmethod::nmethod( |
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660 methodOop method, |
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661 int nmethod_size, |
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662 CodeOffsets* offsets, |
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663 CodeBuffer* code_buffer, |
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664 int frame_size) |
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665 : CodeBlob("dtrace nmethod", code_buffer, sizeof(nmethod), |
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666 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, NULL), |
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667 _compiled_synchronized_native_basic_lock_owner_sp_offset(in_ByteSize(-1)), |
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668 _compiled_synchronized_native_basic_lock_sp_offset(in_ByteSize(-1)) |
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669 { |
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670 { |
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671 debug_only(No_Safepoint_Verifier nsv;) |
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672 assert_locked_or_safepoint(CodeCache_lock); |
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673 |
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674 NOT_PRODUCT(_has_debug_info = false); |
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675 _oops_do_mark_link = NULL; |
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676 _method = method; |
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677 _entry_bci = InvocationEntryBci; |
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678 _osr_link = NULL; |
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679 _scavenge_root_link = NULL; |
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680 _scavenge_root_state = 0; |
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681 _compiler = NULL; |
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682 // We have no exception handler or deopt handler make the |
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683 // values something that will never match a pc like the nmethod vtable entry |
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684 _exception_offset = 0; |
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685 _deoptimize_offset = 0; |
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686 _trap_offset = offsets->value(CodeOffsets::Dtrace_trap); |
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687 _orig_pc_offset = 0; |
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688 _stub_offset = data_offset(); |
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689 _consts_offset = data_offset(); |
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690 _scopes_data_offset = data_offset(); |
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691 _scopes_pcs_offset = _scopes_data_offset; |
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692 _dependencies_offset = _scopes_pcs_offset; |
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693 _handler_table_offset = _dependencies_offset; |
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694 _nul_chk_table_offset = _handler_table_offset; |
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695 _nmethod_end_offset = _nul_chk_table_offset; |
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696 _compile_id = 0; // default |
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697 _comp_level = CompLevel_none; |
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698 _entry_point = instructions_begin(); |
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699 _verified_entry_point = instructions_begin() + offsets->value(CodeOffsets::Verified_Entry); |
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700 _osr_entry_point = NULL; |
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701 _exception_cache = NULL; |
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702 _pc_desc_cache.reset_to(NULL); |
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703 |
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704 flags.clear(); |
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705 flags.state = alive; |
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706 _markedForDeoptimization = 0; |
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707 |
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708 _lock_count = 0; |
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709 _stack_traversal_mark = 0; |
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710 |
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711 code_buffer->copy_oops_to(this); |
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712 debug_only(verify_scavenge_root_oops()); |
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713 CodeCache::commit(this); |
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714 VTune::create_nmethod(this); |
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715 } |
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716 |
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717 if (PrintNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) { |
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718 ttyLocker ttyl; // keep the following output all in one block |
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719 // This output goes directly to the tty, not the compiler log. |
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720 // To enable tools to match it up with the compilation activity, |
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721 // be sure to tag this tty output with the compile ID. |
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722 if (xtty != NULL) { |
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723 xtty->begin_head("print_dtrace_nmethod"); |
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724 xtty->method(_method); |
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725 xtty->stamp(); |
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726 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this); |
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727 } |
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728 // print the header part first |
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729 print(); |
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730 // then print the requested information |
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731 if (PrintNMethods) { |
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732 print_code(); |
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733 } |
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734 if (PrintRelocations) { |
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735 print_relocations(); |
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736 } |
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737 if (xtty != NULL) { |
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738 xtty->tail("print_dtrace_nmethod"); |
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739 } |
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740 } |
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741 Events::log("Create nmethod " INTPTR_FORMAT, this); |
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742 } |
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743 #endif // def HAVE_DTRACE_H |
0 | 744 |
745 void* nmethod::operator new(size_t size, int nmethod_size) { | |
746 // Always leave some room in the CodeCache for I2C/C2I adapters | |
747 if (CodeCache::unallocated_capacity() < CodeCacheMinimumFreeSpace) return NULL; | |
748 return CodeCache::allocate(nmethod_size); | |
749 } | |
750 | |
751 | |
752 nmethod::nmethod( | |
753 methodOop method, | |
754 int nmethod_size, | |
755 int compile_id, | |
756 int entry_bci, | |
757 CodeOffsets* offsets, | |
758 int orig_pc_offset, | |
759 DebugInformationRecorder* debug_info, | |
760 Dependencies* dependencies, | |
761 CodeBuffer *code_buffer, | |
762 int frame_size, | |
763 OopMapSet* oop_maps, | |
764 ExceptionHandlerTable* handler_table, | |
765 ImplicitExceptionTable* nul_chk_table, | |
766 AbstractCompiler* compiler, | |
767 int comp_level | |
768 ) | |
769 : CodeBlob("nmethod", code_buffer, sizeof(nmethod), | |
770 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps), | |
771 _compiled_synchronized_native_basic_lock_owner_sp_offset(in_ByteSize(-1)), | |
772 _compiled_synchronized_native_basic_lock_sp_offset(in_ByteSize(-1)) | |
773 { | |
774 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); | |
775 { | |
776 debug_only(No_Safepoint_Verifier nsv;) | |
777 assert_locked_or_safepoint(CodeCache_lock); | |
778 | |
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779 NOT_PRODUCT(_has_debug_info = false); |
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780 _oops_do_mark_link = NULL; |
0 | 781 _method = method; |
782 _compile_id = compile_id; | |
783 _comp_level = comp_level; | |
784 _entry_bci = entry_bci; | |
989
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785 _osr_link = NULL; |
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786 _scavenge_root_link = NULL; |
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787 _scavenge_root_state = 0; |
0 | 788 _compiler = compiler; |
789 _orig_pc_offset = orig_pc_offset; | |
116
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790 #ifdef HAVE_DTRACE_H |
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791 _trap_offset = 0; |
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792 #endif // def HAVE_DTRACE_H |
0 | 793 _stub_offset = instructions_offset() + code_buffer->total_offset_of(code_buffer->stubs()->start()); |
794 | |
795 // Exception handler and deopt handler are in the stub section | |
796 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions); | |
797 _deoptimize_offset = _stub_offset + offsets->value(CodeOffsets::Deopt); | |
798 _consts_offset = instructions_offset() + code_buffer->total_offset_of(code_buffer->consts()->start()); | |
799 _scopes_data_offset = data_offset(); | |
800 _scopes_pcs_offset = _scopes_data_offset + round_to(debug_info->data_size (), oopSize); | |
801 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size()); | |
802 _handler_table_offset = _dependencies_offset + round_to(dependencies->size_in_bytes (), oopSize); | |
803 _nul_chk_table_offset = _handler_table_offset + round_to(handler_table->size_in_bytes(), oopSize); | |
804 _nmethod_end_offset = _nul_chk_table_offset + round_to(nul_chk_table->size_in_bytes(), oopSize); | |
805 | |
806 _entry_point = instructions_begin(); | |
807 _verified_entry_point = instructions_begin() + offsets->value(CodeOffsets::Verified_Entry); | |
808 _osr_entry_point = instructions_begin() + offsets->value(CodeOffsets::OSR_Entry); | |
809 _exception_cache = NULL; | |
810 _pc_desc_cache.reset_to(scopes_pcs_begin()); | |
811 | |
812 flags.clear(); | |
813 flags.state = alive; | |
814 _markedForDeoptimization = 0; | |
815 | |
816 _unload_reported = false; // jvmti state | |
817 | |
818 _lock_count = 0; | |
819 _stack_traversal_mark = 0; | |
820 | |
821 // Copy contents of ScopeDescRecorder to nmethod | |
822 code_buffer->copy_oops_to(this); | |
823 debug_info->copy_to(this); | |
824 dependencies->copy_to(this); | |
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825 if (ScavengeRootsInCode && detect_scavenge_root_oops()) { |
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826 CodeCache::add_scavenge_root_nmethod(this); |
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827 } |
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828 debug_only(verify_scavenge_root_oops()); |
0 | 829 |
830 CodeCache::commit(this); | |
831 | |
832 VTune::create_nmethod(this); | |
833 | |
834 // Copy contents of ExceptionHandlerTable to nmethod | |
835 handler_table->copy_to(this); | |
836 nul_chk_table->copy_to(this); | |
837 | |
838 // we use the information of entry points to find out if a method is | |
839 // static or non static | |
840 assert(compiler->is_c2() || | |
841 _method->is_static() == (entry_point() == _verified_entry_point), | |
842 " entry points must be same for static methods and vice versa"); | |
843 } | |
844 | |
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845 bool printnmethods = PrintNMethods |
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846 || CompilerOracle::should_print(_method) |
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847 || CompilerOracle::has_option_string(_method, "PrintNMethods"); |
0 | 848 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) { |
849 print_nmethod(printnmethods); | |
850 } | |
851 | |
852 // Note: Do not verify in here as the CodeCache_lock is | |
853 // taken which would conflict with the CompiledIC_lock | |
854 // which taken during the verification of call sites. | |
855 // (was bug - gri 10/25/99) | |
856 | |
857 Events::log("Create nmethod " INTPTR_FORMAT, this); | |
858 } | |
859 | |
860 | |
861 // Print a short set of xml attributes to identify this nmethod. The | |
862 // output should be embedded in some other element. | |
863 void nmethod::log_identity(xmlStream* log) const { | |
864 log->print(" compile_id='%d'", compile_id()); | |
865 const char* nm_kind = compile_kind(); | |
866 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind); | |
867 if (compiler() != NULL) { | |
868 log->print(" compiler='%s'", compiler()->name()); | |
869 } | |
870 #ifdef TIERED | |
871 log->print(" level='%d'", comp_level()); | |
872 #endif // TIERED | |
873 } | |
874 | |
875 | |
876 #define LOG_OFFSET(log, name) \ | |
877 if ((intptr_t)name##_end() - (intptr_t)name##_begin()) \ | |
878 log->print(" " XSTR(name) "_offset='%d'" , \ | |
879 (intptr_t)name##_begin() - (intptr_t)this) | |
880 | |
881 | |
882 void nmethod::log_new_nmethod() const { | |
883 if (LogCompilation && xtty != NULL) { | |
884 ttyLocker ttyl; | |
885 HandleMark hm; | |
886 xtty->begin_elem("nmethod"); | |
887 log_identity(xtty); | |
888 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", | |
889 instructions_begin(), size()); | |
890 xtty->print(" address='" INTPTR_FORMAT "'", (intptr_t) this); | |
891 | |
892 LOG_OFFSET(xtty, relocation); | |
893 LOG_OFFSET(xtty, code); | |
894 LOG_OFFSET(xtty, stub); | |
895 LOG_OFFSET(xtty, consts); | |
896 LOG_OFFSET(xtty, scopes_data); | |
897 LOG_OFFSET(xtty, scopes_pcs); | |
898 LOG_OFFSET(xtty, dependencies); | |
899 LOG_OFFSET(xtty, handler_table); | |
900 LOG_OFFSET(xtty, nul_chk_table); | |
901 LOG_OFFSET(xtty, oops); | |
902 | |
903 xtty->method(method()); | |
904 xtty->stamp(); | |
905 xtty->end_elem(); | |
906 } | |
907 } | |
908 | |
909 #undef LOG_OFFSET | |
910 | |
911 | |
912 // Print out more verbose output usually for a newly created nmethod. | |
913 void nmethod::print_on(outputStream* st, const char* title) const { | |
914 if (st != NULL) { | |
915 ttyLocker ttyl; | |
916 // Print a little tag line that looks like +PrintCompilation output: | |
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917 int tlen = (int) strlen(title); |
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918 bool do_nl = false; |
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919 if (tlen > 0 && title[tlen-1] == '\n') { tlen--; do_nl = true; } |
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920 st->print("%3d%c %.*s", |
0 | 921 compile_id(), |
922 is_osr_method() ? '%' : | |
923 method() != NULL && | |
924 is_native_method() ? 'n' : ' ', | |
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925 tlen, title); |
0 | 926 #ifdef TIERED |
927 st->print(" (%d) ", comp_level()); | |
928 #endif // TIERED | |
929 if (WizardMode) st->print(" (" INTPTR_FORMAT ")", this); | |
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930 if (Universe::heap()->is_gc_active() && method() != NULL) { |
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931 st->print("(method)"); |
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932 } else if (method() != NULL) { |
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933 method()->print_short_name(st); |
0 | 934 if (is_osr_method()) |
935 st->print(" @ %d", osr_entry_bci()); | |
936 if (method()->code_size() > 0) | |
937 st->print(" (%d bytes)", method()->code_size()); | |
938 } | |
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939 |
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940 if (do_nl) st->cr(); |
0 | 941 } |
942 } | |
943 | |
944 | |
945 void nmethod::print_nmethod(bool printmethod) { | |
946 ttyLocker ttyl; // keep the following output all in one block | |
947 if (xtty != NULL) { | |
948 xtty->begin_head("print_nmethod"); | |
949 xtty->stamp(); | |
950 xtty->end_head(); | |
951 } | |
952 // print the header part first | |
953 print(); | |
954 // then print the requested information | |
955 if (printmethod) { | |
956 print_code(); | |
957 print_pcs(); | |
958 oop_maps()->print(); | |
959 } | |
960 if (PrintDebugInfo) { | |
961 print_scopes(); | |
962 } | |
963 if (PrintRelocations) { | |
964 print_relocations(); | |
965 } | |
966 if (PrintDependencies) { | |
967 print_dependencies(); | |
968 } | |
969 if (PrintExceptionHandlers) { | |
970 print_handler_table(); | |
971 print_nul_chk_table(); | |
972 } | |
973 if (xtty != NULL) { | |
974 xtty->tail("print_nmethod"); | |
975 } | |
976 } | |
977 | |
978 | |
979 void nmethod::set_version(int v) { | |
980 flags.version = v; | |
981 } | |
982 | |
983 | |
984 ScopeDesc* nmethod::scope_desc_at(address pc) { | |
985 PcDesc* pd = pc_desc_at(pc); | |
986 guarantee(pd != NULL, "scope must be present"); | |
987 return new ScopeDesc(this, pd->scope_decode_offset(), | |
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988 pd->obj_decode_offset(), pd->should_reexecute()); |
0 | 989 } |
990 | |
991 | |
992 void nmethod::clear_inline_caches() { | |
993 assert(SafepointSynchronize::is_at_safepoint(), "cleaning of IC's only allowed at safepoint"); | |
994 if (is_zombie()) { | |
995 return; | |
996 } | |
997 | |
998 RelocIterator iter(this); | |
999 while (iter.next()) { | |
1000 iter.reloc()->clear_inline_cache(); | |
1001 } | |
1002 } | |
1003 | |
1004 | |
1005 void nmethod::cleanup_inline_caches() { | |
1006 | |
1007 assert(SafepointSynchronize::is_at_safepoint() && | |
1008 !CompiledIC_lock->is_locked() && | |
1009 !Patching_lock->is_locked(), "no threads must be updating the inline caches by them selfs"); | |
1010 | |
1011 // If the method is not entrant or zombie then a JMP is plastered over the | |
1012 // first few bytes. If an oop in the old code was there, that oop | |
1013 // should not get GC'd. Skip the first few bytes of oops on | |
1014 // not-entrant methods. | |
1015 address low_boundary = verified_entry_point(); | |
1016 if (!is_in_use()) { | |
1017 low_boundary += NativeJump::instruction_size; | |
1018 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. | |
1019 // This means that the low_boundary is going to be a little too high. | |
1020 // This shouldn't matter, since oops of non-entrant methods are never used. | |
1021 // In fact, why are we bothering to look at oops in a non-entrant method?? | |
1022 } | |
1023 | |
1024 // Find all calls in an nmethod, and clear the ones that points to zombie methods | |
1025 ResourceMark rm; | |
1026 RelocIterator iter(this, low_boundary); | |
1027 while(iter.next()) { | |
1028 switch(iter.type()) { | |
1029 case relocInfo::virtual_call_type: | |
1030 case relocInfo::opt_virtual_call_type: { | |
1031 CompiledIC *ic = CompiledIC_at(iter.reloc()); | |
1032 // Ok, to lookup references to zombies here | |
1033 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination()); | |
1034 if( cb != NULL && cb->is_nmethod() ) { | |
1035 nmethod* nm = (nmethod*)cb; | |
1036 // Clean inline caches pointing to both zombie and not_entrant methods | |
1037 if (!nm->is_in_use()) ic->set_to_clean(); | |
1038 } | |
1039 break; | |
1040 } | |
1041 case relocInfo::static_call_type: { | |
1042 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc()); | |
1043 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination()); | |
1044 if( cb != NULL && cb->is_nmethod() ) { | |
1045 nmethod* nm = (nmethod*)cb; | |
1046 // Clean inline caches pointing to both zombie and not_entrant methods | |
1047 if (!nm->is_in_use()) csc->set_to_clean(); | |
1048 } | |
1049 break; | |
1050 } | |
1051 } | |
1052 } | |
1053 } | |
1054 | |
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1055 // This is a private interface with the sweeper. |
0 | 1056 void nmethod::mark_as_seen_on_stack() { |
1057 assert(is_not_entrant(), "must be a non-entrant method"); | |
1058 set_stack_traversal_mark(NMethodSweeper::traversal_count()); | |
1059 } | |
1060 | |
1061 // Tell if a non-entrant method can be converted to a zombie (i.e., there is no activations on the stack) | |
1062 bool nmethod::can_not_entrant_be_converted() { | |
1063 assert(is_not_entrant(), "must be a non-entrant method"); | |
1064 assert(SafepointSynchronize::is_at_safepoint(), "must be called during a safepoint"); | |
1065 | |
1066 // Since the nmethod sweeper only does partial sweep the sweeper's traversal | |
1067 // count can be greater than the stack traversal count before it hits the | |
1068 // nmethod for the second time. | |
1069 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count(); | |
1070 } | |
1071 | |
1072 void nmethod::inc_decompile_count() { | |
1073 // Could be gated by ProfileTraps, but do not bother... | |
1074 methodOop m = method(); | |
1075 if (m == NULL) return; | |
1076 methodDataOop mdo = m->method_data(); | |
1077 if (mdo == NULL) return; | |
1078 // There is a benign race here. See comments in methodDataOop.hpp. | |
1079 mdo->inc_decompile_count(); | |
1080 } | |
1081 | |
1082 void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) { | |
1083 | |
1084 post_compiled_method_unload(); | |
1085 | |
1086 // Since this nmethod is being unloaded, make sure that dependencies | |
1087 // recorded in instanceKlasses get flushed and pass non-NULL closure to | |
1088 // indicate that this work is being done during a GC. | |
1089 assert(Universe::heap()->is_gc_active(), "should only be called during gc"); | |
1090 assert(is_alive != NULL, "Should be non-NULL"); | |
1091 // A non-NULL is_alive closure indicates that this is being called during GC. | |
1092 flush_dependencies(is_alive); | |
1093 | |
1094 // Break cycle between nmethod & method | |
1095 if (TraceClassUnloading && WizardMode) { | |
1096 tty->print_cr("[Class unloading: Making nmethod " INTPTR_FORMAT | |
1097 " unloadable], methodOop(" INTPTR_FORMAT | |
1098 "), cause(" INTPTR_FORMAT ")", | |
1099 this, (address)_method, (address)cause); | |
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1100 if (!Universe::heap()->is_gc_active()) |
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1101 cause->klass()->print(); |
0 | 1102 } |
941 | 1103 // Unlink the osr method, so we do not look this up again |
1104 if (is_osr_method()) { | |
1105 invalidate_osr_method(); | |
1106 } | |
0 | 1107 // If _method is already NULL the methodOop is about to be unloaded, |
1108 // so we don't have to break the cycle. Note that it is possible to | |
1109 // have the methodOop live here, in case we unload the nmethod because | |
1110 // it is pointing to some oop (other than the methodOop) being unloaded. | |
1111 if (_method != NULL) { | |
1112 // OSR methods point to the methodOop, but the methodOop does not | |
1113 // point back! | |
1114 if (_method->code() == this) { | |
1115 _method->clear_code(); // Break a cycle | |
1116 } | |
1117 inc_decompile_count(); // Last chance to make a mark on the MDO | |
1118 _method = NULL; // Clear the method of this dead nmethod | |
1119 } | |
1120 // Make the class unloaded - i.e., change state and notify sweeper | |
1121 check_safepoint(); | |
1122 if (is_in_use()) { | |
1123 // Transitioning directly from live to unloaded -- so | |
1124 // we need to force a cache clean-up; remember this | |
1125 // for later on. | |
1126 CodeCache::set_needs_cache_clean(true); | |
1127 } | |
1128 flags.state = unloaded; | |
1129 | |
1130 // The methodOop is gone at this point | |
1131 assert(_method == NULL, "Tautology"); | |
1132 | |
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1133 set_osr_link(NULL); |
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1134 //set_scavenge_root_link(NULL); // done by prune_scavenge_root_nmethods |
0 | 1135 NMethodSweeper::notify(this); |
1136 } | |
1137 | |
1138 void nmethod::invalidate_osr_method() { | |
1139 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); | |
1140 if (_entry_bci != InvalidOSREntryBci) | |
1141 inc_decompile_count(); | |
1142 // Remove from list of active nmethods | |
1143 if (method() != NULL) | |
1144 instanceKlass::cast(method()->method_holder())->remove_osr_nmethod(this); | |
1145 // Set entry as invalid | |
1146 _entry_bci = InvalidOSREntryBci; | |
1147 } | |
1148 | |
1149 void nmethod::log_state_change(int state) const { | |
1150 if (LogCompilation) { | |
1151 if (xtty != NULL) { | |
1152 ttyLocker ttyl; // keep the following output all in one block | |
1153 xtty->begin_elem("make_not_entrant %sthread='" UINTX_FORMAT "'", | |
1154 (state == zombie ? "zombie='1' " : ""), | |
1155 os::current_thread_id()); | |
1156 log_identity(xtty); | |
1157 xtty->stamp(); | |
1158 xtty->end_elem(); | |
1159 } | |
1160 } | |
1161 if (PrintCompilation) { | |
1162 print_on(tty, state == zombie ? "made zombie " : "made not entrant "); | |
1163 tty->cr(); | |
1164 } | |
1165 } | |
1166 | |
1167 // Common functionality for both make_not_entrant and make_zombie | |
1168 void nmethod::make_not_entrant_or_zombie(int state) { | |
1169 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant"); | |
1170 | |
1171 // Code for an on-stack-replacement nmethod is removed when a class gets unloaded. | |
1172 // They never become zombie/non-entrant, so the nmethod sweeper will never remove | |
1173 // them. Instead the entry_bci is set to InvalidOSREntryBci, so the osr nmethod | |
1174 // will never be used anymore. That the nmethods only gets removed when class unloading | |
1175 // happens, make life much simpler, since the nmethods are not just going to disappear | |
1176 // out of the blue. | |
941 | 1177 if (is_osr_method()) { |
0 | 1178 if (osr_entry_bci() != InvalidOSREntryBci) { |
1179 // only log this once | |
1180 log_state_change(state); | |
1181 } | |
1182 invalidate_osr_method(); | |
1183 return; | |
1184 } | |
1185 | |
1186 // If the method is already zombie or set to the state we want, nothing to do | |
1187 if (is_zombie() || (state == not_entrant && is_not_entrant())) { | |
1188 return; | |
1189 } | |
1190 | |
1191 log_state_change(state); | |
1192 | |
1193 // Make sure the nmethod is not flushed in case of a safepoint in code below. | |
1194 nmethodLocker nml(this); | |
1195 | |
1196 { | |
1197 // Enter critical section. Does not block for safepoint. | |
1198 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); | |
1199 // The caller can be calling the method statically or through an inline | |
1200 // cache call. | |
1201 if (!is_not_entrant()) { | |
1202 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(), | |
1203 SharedRuntime::get_handle_wrong_method_stub()); | |
1204 assert (NativeJump::instruction_size == nmethod::_zombie_instruction_size, ""); | |
1205 } | |
1206 | |
1207 // When the nmethod becomes zombie it is no longer alive so the | |
1208 // dependencies must be flushed. nmethods in the not_entrant | |
1209 // state will be flushed later when the transition to zombie | |
1210 // happens or they get unloaded. | |
1211 if (state == zombie) { | |
1212 assert(SafepointSynchronize::is_at_safepoint(), "must be done at safepoint"); | |
1213 flush_dependencies(NULL); | |
1214 } else { | |
1215 assert(state == not_entrant, "other cases may need to be handled differently"); | |
1216 } | |
1217 | |
1218 // Change state | |
1219 flags.state = state; | |
1220 } // leave critical region under Patching_lock | |
1221 | |
1222 if (state == not_entrant) { | |
1223 Events::log("Make nmethod not entrant " INTPTR_FORMAT, this); | |
1224 } else { | |
1225 Events::log("Make nmethod zombie " INTPTR_FORMAT, this); | |
1226 } | |
1227 | |
1228 if (TraceCreateZombies) { | |
1229 tty->print_cr("nmethod <" INTPTR_FORMAT "> code made %s", this, (state == not_entrant) ? "not entrant" : "zombie"); | |
1230 } | |
1231 | |
1232 // Make sweeper aware that there is a zombie method that needs to be removed | |
1233 NMethodSweeper::notify(this); | |
1234 | |
1235 // not_entrant only stuff | |
1236 if (state == not_entrant) { | |
1237 mark_as_seen_on_stack(); | |
1238 } | |
1239 | |
1240 // It's a true state change, so mark the method as decompiled. | |
1241 inc_decompile_count(); | |
1242 | |
1243 | |
1244 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload event | |
1245 // and it hasn't already been reported for this nmethod then report it now. | |
1246 // (the event may have been reported earilier if the GC marked it for unloading). | |
1247 if (state == zombie) { | |
1248 | |
1249 DTRACE_METHOD_UNLOAD_PROBE(method()); | |
1250 | |
1251 if (JvmtiExport::should_post_compiled_method_unload() && | |
1252 !unload_reported()) { | |
1253 assert(method() != NULL, "checking"); | |
1254 { | |
1255 HandleMark hm; | |
1256 JvmtiExport::post_compiled_method_unload_at_safepoint( | |
1257 method()->jmethod_id(), code_begin()); | |
1258 } | |
1259 set_unload_reported(); | |
1260 } | |
1261 } | |
1262 | |
1263 | |
1264 // Zombie only stuff | |
1265 if (state == zombie) { | |
1266 VTune::delete_nmethod(this); | |
1267 } | |
1268 | |
1269 // Check whether method got unloaded at a safepoint before this, | |
1270 // if so we can skip the flushing steps below | |
1271 if (method() == NULL) return; | |
1272 | |
1273 // Remove nmethod from method. | |
1274 // We need to check if both the _code and _from_compiled_code_entry_point | |
1275 // refer to this nmethod because there is a race in setting these two fields | |
1276 // in methodOop as seen in bugid 4947125. | |
1277 // If the vep() points to the zombie nmethod, the memory for the nmethod | |
1278 // could be flushed and the compiler and vtable stubs could still call | |
1279 // through it. | |
1280 if (method()->code() == this || | |
1281 method()->from_compiled_entry() == verified_entry_point()) { | |
1282 HandleMark hm; | |
1283 method()->clear_code(); | |
1284 } | |
1285 } | |
1286 | |
1287 | |
1288 #ifndef PRODUCT | |
1289 void nmethod::check_safepoint() { | |
1290 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); | |
1291 } | |
1292 #endif | |
1293 | |
1294 | |
1295 void nmethod::flush() { | |
1296 // Note that there are no valid oops in the nmethod anymore. | |
1297 assert(is_zombie() || (is_osr_method() && is_unloaded()), "must be a zombie method"); | |
1298 assert(is_marked_for_reclamation() || (is_osr_method() && is_unloaded()), "must be marked for reclamation"); | |
1299 | |
1300 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed"); | |
1301 check_safepoint(); | |
1302 | |
1303 // completely deallocate this method | |
1304 EventMark m("flushing nmethod " INTPTR_FORMAT " %s", this, ""); | |
1305 if (PrintMethodFlushing) { | |
1306 tty->print_cr("*flushing nmethod " INTPTR_FORMAT ". Live blobs: %d", this, CodeCache::nof_blobs()); | |
1307 } | |
1308 | |
1309 // We need to deallocate any ExceptionCache data. | |
1310 // Note that we do not need to grab the nmethod lock for this, it | |
1311 // better be thread safe if we're disposing of it! | |
1312 ExceptionCache* ec = exception_cache(); | |
1313 set_exception_cache(NULL); | |
1314 while(ec != NULL) { | |
1315 ExceptionCache* next = ec->next(); | |
1316 delete ec; | |
1317 ec = next; | |
1318 } | |
1319 | |
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1320 if (on_scavenge_root_list()) { |
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1321 CodeCache::drop_scavenge_root_nmethod(this); |
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1322 } |
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1323 |
0 | 1324 ((CodeBlob*)(this))->flush(); |
1325 | |
1326 CodeCache::free(this); | |
1327 } | |
1328 | |
1329 | |
1330 // | |
1331 // Notify all classes this nmethod is dependent on that it is no | |
1332 // longer dependent. This should only be called in two situations. | |
1333 // First, when a nmethod transitions to a zombie all dependents need | |
1334 // to be clear. Since zombification happens at a safepoint there's no | |
1335 // synchronization issues. The second place is a little more tricky. | |
1336 // During phase 1 of mark sweep class unloading may happen and as a | |
1337 // result some nmethods may get unloaded. In this case the flushing | |
1338 // of dependencies must happen during phase 1 since after GC any | |
1339 // dependencies in the unloaded nmethod won't be updated, so | |
1340 // traversing the dependency information in unsafe. In that case this | |
1341 // function is called with a non-NULL argument and this function only | |
1342 // notifies instanceKlasses that are reachable | |
1343 | |
1344 void nmethod::flush_dependencies(BoolObjectClosure* is_alive) { | |
1345 assert(SafepointSynchronize::is_at_safepoint(), "must be done at safepoint"); | |
1346 assert(Universe::heap()->is_gc_active() == (is_alive != NULL), | |
1347 "is_alive is non-NULL if and only if we are called during GC"); | |
1348 if (!has_flushed_dependencies()) { | |
1349 set_has_flushed_dependencies(); | |
1350 for (Dependencies::DepStream deps(this); deps.next(); ) { | |
1351 klassOop klass = deps.context_type(); | |
1352 if (klass == NULL) continue; // ignore things like evol_method | |
1353 | |
1354 // During GC the is_alive closure is non-NULL, and is used to | |
1355 // determine liveness of dependees that need to be updated. | |
1356 if (is_alive == NULL || is_alive->do_object_b(klass)) { | |
1357 instanceKlass::cast(klass)->remove_dependent_nmethod(this); | |
1358 } | |
1359 } | |
1360 } | |
1361 } | |
1362 | |
1363 | |
1364 // If this oop is not live, the nmethod can be unloaded. | |
1365 bool nmethod::can_unload(BoolObjectClosure* is_alive, | |
1366 OopClosure* keep_alive, | |
1367 oop* root, bool unloading_occurred) { | |
1368 assert(root != NULL, "just checking"); | |
1369 oop obj = *root; | |
1370 if (obj == NULL || is_alive->do_object_b(obj)) { | |
1371 return false; | |
1372 } | |
1373 if (obj->is_compiledICHolder()) { | |
1374 compiledICHolderOop cichk_oop = compiledICHolderOop(obj); | |
1375 if (is_alive->do_object_b( | |
1376 cichk_oop->holder_method()->method_holder()) && | |
1377 is_alive->do_object_b(cichk_oop->holder_klass())) { | |
1378 // The oop should be kept alive | |
1379 keep_alive->do_oop(root); | |
1380 return false; | |
1381 } | |
1382 } | |
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1383 // If ScavengeRootsInCode is true, an nmethod might be unloaded |
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1384 // simply because one of its constant oops has gone dead. |
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1385 // No actual classes need to be unloaded in order for this to occur. |
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1386 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading"); |
0 | 1387 make_unloaded(is_alive, obj); |
1388 return true; | |
1389 } | |
1390 | |
1391 // ------------------------------------------------------------------ | |
1392 // post_compiled_method_load_event | |
1393 // new method for install_code() path | |
1394 // Transfer information from compilation to jvmti | |
1395 void nmethod::post_compiled_method_load_event() { | |
1396 | |
1397 methodOop moop = method(); | |
1398 HS_DTRACE_PROBE8(hotspot, compiled__method__load, | |
1399 moop->klass_name()->bytes(), | |
1400 moop->klass_name()->utf8_length(), | |
1401 moop->name()->bytes(), | |
1402 moop->name()->utf8_length(), | |
1403 moop->signature()->bytes(), | |
1404 moop->signature()->utf8_length(), | |
1405 code_begin(), code_size()); | |
1406 | |
1407 if (JvmtiExport::should_post_compiled_method_load()) { | |
1408 JvmtiExport::post_compiled_method_load(this); | |
1409 } | |
1410 } | |
1411 | |
1412 void nmethod::post_compiled_method_unload() { | |
1413 assert(_method != NULL && !is_unloaded(), "just checking"); | |
1414 DTRACE_METHOD_UNLOAD_PROBE(method()); | |
1415 | |
1416 // If a JVMTI agent has enabled the CompiledMethodUnload event then | |
1417 // post the event. Sometime later this nmethod will be made a zombie by | |
1418 // the sweeper but the methodOop will not be valid at that point. | |
1419 if (JvmtiExport::should_post_compiled_method_unload()) { | |
1420 assert(!unload_reported(), "already unloaded"); | |
1421 HandleMark hm; | |
1422 JvmtiExport::post_compiled_method_unload_at_safepoint( | |
1423 method()->jmethod_id(), code_begin()); | |
1424 } | |
1425 | |
1426 // The JVMTI CompiledMethodUnload event can be enabled or disabled at | |
1427 // any time. As the nmethod is being unloaded now we mark it has | |
1428 // having the unload event reported - this will ensure that we don't | |
1429 // attempt to report the event in the unlikely scenario where the | |
1430 // event is enabled at the time the nmethod is made a zombie. | |
1431 set_unload_reported(); | |
1432 } | |
1433 | |
1434 // This is called at the end of the strong tracing/marking phase of a | |
1435 // GC to unload an nmethod if it contains otherwise unreachable | |
1436 // oops. | |
1437 | |
1438 void nmethod::do_unloading(BoolObjectClosure* is_alive, | |
1439 OopClosure* keep_alive, bool unloading_occurred) { | |
1440 // Make sure the oop's ready to receive visitors | |
1441 assert(!is_zombie() && !is_unloaded(), | |
1442 "should not call follow on zombie or unloaded nmethod"); | |
1443 | |
1444 // If the method is not entrant then a JMP is plastered over the | |
1445 // first few bytes. If an oop in the old code was there, that oop | |
1446 // should not get GC'd. Skip the first few bytes of oops on | |
1447 // not-entrant methods. | |
1448 address low_boundary = verified_entry_point(); | |
1449 if (is_not_entrant()) { | |
1450 low_boundary += NativeJump::instruction_size; | |
1451 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. | |
1452 // (See comment above.) | |
1453 } | |
1454 | |
1455 // The RedefineClasses() API can cause the class unloading invariant | |
1456 // to no longer be true. See jvmtiExport.hpp for details. | |
1457 // Also, leave a debugging breadcrumb in local flag. | |
1458 bool a_class_was_redefined = JvmtiExport::has_redefined_a_class(); | |
1459 if (a_class_was_redefined) { | |
1460 // This set of the unloading_occurred flag is done before the | |
1461 // call to post_compiled_method_unload() so that the unloading | |
1462 // of this nmethod is reported. | |
1463 unloading_occurred = true; | |
1464 } | |
1465 | |
1466 // Follow methodOop | |
1467 if (can_unload(is_alive, keep_alive, (oop*)&_method, unloading_occurred)) { | |
1468 return; | |
1469 } | |
1470 | |
1471 // Exception cache | |
1472 ExceptionCache* ec = exception_cache(); | |
1473 while (ec != NULL) { | |
1474 oop* ex_addr = (oop*)ec->exception_type_addr(); | |
1475 oop ex = *ex_addr; | |
1476 ExceptionCache* next_ec = ec->next(); | |
1477 if (ex != NULL && !is_alive->do_object_b(ex)) { | |
1478 assert(!ex->is_compiledICHolder(), "Possible error here"); | |
1479 remove_from_exception_cache(ec); | |
1480 } | |
1481 ec = next_ec; | |
1482 } | |
1483 | |
1484 // If class unloading occurred we first iterate over all inline caches and | |
1485 // clear ICs where the cached oop is referring to an unloaded klass or method. | |
1486 // The remaining live cached oops will be traversed in the relocInfo::oop_type | |
1487 // iteration below. | |
1488 if (unloading_occurred) { | |
1489 RelocIterator iter(this, low_boundary); | |
1490 while(iter.next()) { | |
1491 if (iter.type() == relocInfo::virtual_call_type) { | |
1492 CompiledIC *ic = CompiledIC_at(iter.reloc()); | |
1493 oop ic_oop = ic->cached_oop(); | |
1494 if (ic_oop != NULL && !is_alive->do_object_b(ic_oop)) { | |
1495 // The only exception is compiledICHolder oops which may | |
1496 // yet be marked below. (We check this further below). | |
1497 if (ic_oop->is_compiledICHolder()) { | |
1498 compiledICHolderOop cichk_oop = compiledICHolderOop(ic_oop); | |
1499 if (is_alive->do_object_b( | |
1500 cichk_oop->holder_method()->method_holder()) && | |
1501 is_alive->do_object_b(cichk_oop->holder_klass())) { | |
1502 continue; | |
1503 } | |
1504 } | |
1505 ic->set_to_clean(); | |
1506 assert(ic->cached_oop() == NULL, "cached oop in IC should be cleared") | |
1507 } | |
1508 } | |
1509 } | |
1510 } | |
1511 | |
1512 // Compiled code | |
1513 RelocIterator iter(this, low_boundary); | |
1514 while (iter.next()) { | |
1515 if (iter.type() == relocInfo::oop_type) { | |
1516 oop_Relocation* r = iter.oop_reloc(); | |
1517 // In this loop, we must only traverse those oops directly embedded in | |
1518 // the code. Other oops (oop_index>0) are seen as part of scopes_oops. | |
1519 assert(1 == (r->oop_is_immediate()) + | |
1520 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), | |
1521 "oop must be found in exactly one place"); | |
1522 if (r->oop_is_immediate() && r->oop_value() != NULL) { | |
1523 if (can_unload(is_alive, keep_alive, r->oop_addr(), unloading_occurred)) { | |
1524 return; | |
1525 } | |
1526 } | |
1527 } | |
1528 } | |
1529 | |
1530 | |
1531 // Scopes | |
1532 for (oop* p = oops_begin(); p < oops_end(); p++) { | |
1533 if (*p == Universe::non_oop_word()) continue; // skip non-oops | |
1534 if (can_unload(is_alive, keep_alive, p, unloading_occurred)) { | |
1535 return; | |
1536 } | |
1537 } | |
1538 | |
1539 #ifndef PRODUCT | |
1540 // This nmethod was not unloaded; check below that all CompiledICs | |
1541 // refer to marked oops. | |
1542 { | |
1543 RelocIterator iter(this, low_boundary); | |
1544 while (iter.next()) { | |
1545 if (iter.type() == relocInfo::virtual_call_type) { | |
1546 CompiledIC *ic = CompiledIC_at(iter.reloc()); | |
1547 oop ic_oop = ic->cached_oop(); | |
1548 assert(ic_oop == NULL || is_alive->do_object_b(ic_oop), | |
1549 "Found unmarked ic_oop in reachable nmethod"); | |
1550 } | |
1551 } | |
1552 } | |
1553 #endif // !PRODUCT | |
1554 } | |
1555 | |
941 | 1556 // This method is called twice during GC -- once while |
1557 // tracing the "active" nmethods on thread stacks during | |
1558 // the (strong) marking phase, and then again when walking | |
1559 // the code cache contents during the weak roots processing | |
1560 // phase. The two uses are distinguished by means of the | |
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1561 // 'do_strong_roots_only' flag, which is true in the first |
941 | 1562 // case. We want to walk the weak roots in the nmethod |
1563 // only in the second case. The weak roots in the nmethod | |
1564 // are the oops in the ExceptionCache and the InlineCache | |
1565 // oops. | |
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1566 void nmethod::oops_do(OopClosure* f, bool do_strong_roots_only) { |
0 | 1567 // make sure the oops ready to receive visitors |
1568 assert(!is_zombie() && !is_unloaded(), | |
1569 "should not call follow on zombie or unloaded nmethod"); | |
1570 | |
1571 // If the method is not entrant or zombie then a JMP is plastered over the | |
1572 // first few bytes. If an oop in the old code was there, that oop | |
1573 // should not get GC'd. Skip the first few bytes of oops on | |
1574 // not-entrant methods. | |
1575 address low_boundary = verified_entry_point(); | |
1576 if (is_not_entrant()) { | |
1577 low_boundary += NativeJump::instruction_size; | |
1578 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. | |
1579 // (See comment above.) | |
1580 } | |
1581 | |
1582 // Compiled code | |
1583 f->do_oop((oop*) &_method); | |
994
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1584 if (!do_strong_roots_only) { |
941 | 1585 // weak roots processing phase -- update ExceptionCache oops |
1586 ExceptionCache* ec = exception_cache(); | |
1587 while(ec != NULL) { | |
1588 f->do_oop((oop*)ec->exception_type_addr()); | |
1589 ec = ec->next(); | |
1590 } | |
1591 } // Else strong roots phase -- skip oops in ExceptionCache | |
0 | 1592 |
1593 RelocIterator iter(this, low_boundary); | |
941 | 1594 |
0 | 1595 while (iter.next()) { |
1596 if (iter.type() == relocInfo::oop_type ) { | |
1597 oop_Relocation* r = iter.oop_reloc(); | |
1598 // In this loop, we must only follow those oops directly embedded in | |
1599 // the code. Other oops (oop_index>0) are seen as part of scopes_oops. | |
941 | 1600 assert(1 == (r->oop_is_immediate()) + |
1601 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), | |
1602 "oop must be found in exactly one place"); | |
0 | 1603 if (r->oop_is_immediate() && r->oop_value() != NULL) { |
1604 f->do_oop(r->oop_addr()); | |
1605 } | |
1606 } | |
1607 } | |
1608 | |
1609 // Scopes | |
989
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1610 // This includes oop constants not inlined in the code stream. |
0 | 1611 for (oop* p = oops_begin(); p < oops_end(); p++) { |
1612 if (*p == Universe::non_oop_word()) continue; // skip non-oops | |
1613 f->do_oop(p); | |
1614 } | |
1615 } | |
1616 | |
989
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1617 #define NMETHOD_SENTINEL ((nmethod*)badAddress) |
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1618 |
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1619 nmethod* volatile nmethod::_oops_do_mark_nmethods; |
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1620 |
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1621 // An nmethod is "marked" if its _mark_link is set non-null. |
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1622 // Even if it is the end of the linked list, it will have a non-null link value, |
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1623 // as long as it is on the list. |
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1624 // This code must be MP safe, because it is used from parallel GC passes. |
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1625 bool nmethod::test_set_oops_do_mark() { |
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1626 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called"); |
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1627 nmethod* observed_mark_link = _oops_do_mark_link; |
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1628 if (observed_mark_link == NULL) { |
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1629 // Claim this nmethod for this thread to mark. |
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1630 observed_mark_link = (nmethod*) |
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1631 Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_link, NULL); |
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1632 if (observed_mark_link == NULL) { |
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1633 |
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1634 // Atomically append this nmethod (now claimed) to the head of the list: |
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1635 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods; |
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1636 for (;;) { |
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1637 nmethod* required_mark_nmethods = observed_mark_nmethods; |
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1638 _oops_do_mark_link = required_mark_nmethods; |
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1639 observed_mark_nmethods = (nmethod*) |
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1640 Atomic::cmpxchg_ptr(this, &_oops_do_mark_nmethods, required_mark_nmethods); |
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1641 if (observed_mark_nmethods == required_mark_nmethods) |
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1642 break; |
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1643 } |
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1644 // Mark was clear when we first saw this guy. |
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1645 NOT_PRODUCT(if (TraceScavenge) print_on(tty, "oops_do, mark\n")); |
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1646 return false; |
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1647 } |
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1648 } |
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1649 // On fall through, another racing thread marked this nmethod before we did. |
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1650 return true; |
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1651 } |
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1652 |
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1653 void nmethod::oops_do_marking_prologue() { |
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1654 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("[oops_do_marking_prologue")); |
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1655 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row"); |
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1656 // We use cmpxchg_ptr instead of regular assignment here because the user |
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1657 // may fork a bunch of threads, and we need them all to see the same state. |
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1658 void* observed = Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, NULL); |
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1659 guarantee(observed == NULL, "no races in this sequential code"); |
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1660 } |
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1661 |
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1662 void nmethod::oops_do_marking_epilogue() { |
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1663 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row"); |
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1664 nmethod* cur = _oops_do_mark_nmethods; |
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1665 while (cur != NMETHOD_SENTINEL) { |
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1666 assert(cur != NULL, "not NULL-terminated"); |
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1667 nmethod* next = cur->_oops_do_mark_link; |
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1668 cur->_oops_do_mark_link = NULL; |
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1669 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark\n")); |
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1670 cur = next; |
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1671 } |
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1672 void* required = _oops_do_mark_nmethods; |
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1673 void* observed = Atomic::cmpxchg_ptr(NULL, &_oops_do_mark_nmethods, required); |
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1674 guarantee(observed == required, "no races in this sequential code"); |
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1675 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("oops_do_marking_epilogue]")); |
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1676 } |
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1677 |
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1678 class DetectScavengeRoot: public OopClosure { |
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1679 bool _detected_scavenge_root; |
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1680 public: |
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1681 DetectScavengeRoot() : _detected_scavenge_root(false) |
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1682 { NOT_PRODUCT(_print_nm = NULL); } |
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1683 bool detected_scavenge_root() { return _detected_scavenge_root; } |
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1684 virtual void do_oop(oop* p) { |
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1685 if ((*p) != NULL && (*p)->is_scavengable()) { |
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1686 NOT_PRODUCT(maybe_print(p)); |
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1687 _detected_scavenge_root = true; |
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1688 } |
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1689 } |
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1690 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } |
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1691 |
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1692 #ifndef PRODUCT |
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1693 nmethod* _print_nm; |
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1694 void maybe_print(oop* p) { |
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1695 if (_print_nm == NULL) return; |
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1696 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root"); |
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1697 tty->print_cr(""PTR_FORMAT"[offset=%d] detected non-perm oop "PTR_FORMAT" (found at "PTR_FORMAT")", |
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1698 _print_nm, (int)((intptr_t)p - (intptr_t)_print_nm), |
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1699 (intptr_t)(*p), (intptr_t)p); |
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1700 (*p)->print(); |
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1701 } |
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1702 #endif //PRODUCT |
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1703 }; |
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1704 |
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1705 bool nmethod::detect_scavenge_root_oops() { |
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1706 DetectScavengeRoot detect_scavenge_root; |
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1707 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this); |
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1708 oops_do(&detect_scavenge_root); |
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1709 return detect_scavenge_root.detected_scavenge_root(); |
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1710 } |
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1711 |
0 | 1712 // Method that knows how to preserve outgoing arguments at call. This method must be |
1713 // called with a frame corresponding to a Java invoke | |
1714 void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { | |
1715 if (!method()->is_native()) { | |
1716 SimpleScopeDesc ssd(this, fr.pc()); | |
1717 Bytecode_invoke* call = Bytecode_invoke_at(ssd.method(), ssd.bci()); | |
1718 bool is_static = call->is_invokestatic(); | |
1719 symbolOop signature = call->signature(); | |
1720 fr.oops_compiled_arguments_do(signature, is_static, reg_map, f); | |
1721 } | |
1722 } | |
1723 | |
1724 | |
1725 oop nmethod::embeddedOop_at(u_char* p) { | |
1726 RelocIterator iter(this, p, p + oopSize); | |
1727 while (iter.next()) | |
1728 if (iter.type() == relocInfo::oop_type) { | |
1729 return iter.oop_reloc()->oop_value(); | |
1730 } | |
1731 return NULL; | |
1732 } | |
1733 | |
1734 | |
1735 inline bool includes(void* p, void* from, void* to) { | |
1736 return from <= p && p < to; | |
1737 } | |
1738 | |
1739 | |
1740 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) { | |
1741 assert(count >= 2, "must be sentinel values, at least"); | |
1742 | |
1743 #ifdef ASSERT | |
1744 // must be sorted and unique; we do a binary search in find_pc_desc() | |
1745 int prev_offset = pcs[0].pc_offset(); | |
1746 assert(prev_offset == PcDesc::lower_offset_limit, | |
1747 "must start with a sentinel"); | |
1748 for (int i = 1; i < count; i++) { | |
1749 int this_offset = pcs[i].pc_offset(); | |
1750 assert(this_offset > prev_offset, "offsets must be sorted"); | |
1751 prev_offset = this_offset; | |
1752 } | |
1753 assert(prev_offset == PcDesc::upper_offset_limit, | |
1754 "must end with a sentinel"); | |
1755 #endif //ASSERT | |
1756 | |
1757 int size = count * sizeof(PcDesc); | |
1758 assert(scopes_pcs_size() >= size, "oob"); | |
1759 memcpy(scopes_pcs_begin(), pcs, size); | |
1760 | |
1761 // Adjust the final sentinel downward. | |
1762 PcDesc* last_pc = &scopes_pcs_begin()[count-1]; | |
1763 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity"); | |
1764 last_pc->set_pc_offset(instructions_size() + 1); | |
1765 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) { | |
1766 // Fill any rounding gaps with copies of the last record. | |
1767 last_pc[1] = last_pc[0]; | |
1768 } | |
1769 // The following assert could fail if sizeof(PcDesc) is not | |
1770 // an integral multiple of oopSize (the rounding term). | |
1771 // If it fails, change the logic to always allocate a multiple | |
1772 // of sizeof(PcDesc), and fill unused words with copies of *last_pc. | |
1773 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly"); | |
1774 } | |
1775 | |
1776 void nmethod::copy_scopes_data(u_char* buffer, int size) { | |
1777 assert(scopes_data_size() >= size, "oob"); | |
1778 memcpy(scopes_data_begin(), buffer, size); | |
1779 } | |
1780 | |
1781 | |
1782 #ifdef ASSERT | |
1783 static PcDesc* linear_search(nmethod* nm, int pc_offset, bool approximate) { | |
1784 PcDesc* lower = nm->scopes_pcs_begin(); | |
1785 PcDesc* upper = nm->scopes_pcs_end(); | |
1786 lower += 1; // exclude initial sentinel | |
1787 PcDesc* res = NULL; | |
1788 for (PcDesc* p = lower; p < upper; p++) { | |
1789 NOT_PRODUCT(--nmethod_stats.pc_desc_tests); // don't count this call to match_desc | |
1790 if (match_desc(p, pc_offset, approximate)) { | |
1791 if (res == NULL) | |
1792 res = p; | |
1793 else | |
1794 res = (PcDesc*) badAddress; | |
1795 } | |
1796 } | |
1797 return res; | |
1798 } | |
1799 #endif | |
1800 | |
1801 | |
1802 // Finds a PcDesc with real-pc equal to "pc" | |
1803 PcDesc* nmethod::find_pc_desc_internal(address pc, bool approximate) { | |
1804 address base_address = instructions_begin(); | |
1805 if ((pc < base_address) || | |
1806 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) { | |
1807 return NULL; // PC is wildly out of range | |
1808 } | |
1809 int pc_offset = (int) (pc - base_address); | |
1810 | |
1811 // Check the PcDesc cache if it contains the desired PcDesc | |
1812 // (This as an almost 100% hit rate.) | |
1813 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate); | |
1814 if (res != NULL) { | |
1815 assert(res == linear_search(this, pc_offset, approximate), "cache ok"); | |
1816 return res; | |
1817 } | |
1818 | |
1819 // Fallback algorithm: quasi-linear search for the PcDesc | |
1820 // Find the last pc_offset less than the given offset. | |
1821 // The successor must be the required match, if there is a match at all. | |
1822 // (Use a fixed radix to avoid expensive affine pointer arithmetic.) | |
1823 PcDesc* lower = scopes_pcs_begin(); | |
1824 PcDesc* upper = scopes_pcs_end(); | |
1825 upper -= 1; // exclude final sentinel | |
1826 if (lower >= upper) return NULL; // native method; no PcDescs at all | |
1827 | |
1828 #define assert_LU_OK \ | |
1829 /* invariant on lower..upper during the following search: */ \ | |
1830 assert(lower->pc_offset() < pc_offset, "sanity"); \ | |
1831 assert(upper->pc_offset() >= pc_offset, "sanity") | |
1832 assert_LU_OK; | |
1833 | |
1834 // Use the last successful return as a split point. | |
1835 PcDesc* mid = _pc_desc_cache.last_pc_desc(); | |
1836 NOT_PRODUCT(++nmethod_stats.pc_desc_searches); | |
1837 if (mid->pc_offset() < pc_offset) { | |
1838 lower = mid; | |
1839 } else { | |
1840 upper = mid; | |
1841 } | |
1842 | |
1843 // Take giant steps at first (4096, then 256, then 16, then 1) | |
1844 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1); | |
1845 const int RADIX = (1 << LOG2_RADIX); | |
1846 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) { | |
1847 while ((mid = lower + step) < upper) { | |
1848 assert_LU_OK; | |
1849 NOT_PRODUCT(++nmethod_stats.pc_desc_searches); | |
1850 if (mid->pc_offset() < pc_offset) { | |
1851 lower = mid; | |
1852 } else { | |
1853 upper = mid; | |
1854 break; | |
1855 } | |
1856 } | |
1857 assert_LU_OK; | |
1858 } | |
1859 | |
1860 // Sneak up on the value with a linear search of length ~16. | |
1861 while (true) { | |
1862 assert_LU_OK; | |
1863 mid = lower + 1; | |
1864 NOT_PRODUCT(++nmethod_stats.pc_desc_searches); | |
1865 if (mid->pc_offset() < pc_offset) { | |
1866 lower = mid; | |
1867 } else { | |
1868 upper = mid; | |
1869 break; | |
1870 } | |
1871 } | |
1872 #undef assert_LU_OK | |
1873 | |
1874 if (match_desc(upper, pc_offset, approximate)) { | |
1875 assert(upper == linear_search(this, pc_offset, approximate), "search ok"); | |
1876 _pc_desc_cache.add_pc_desc(upper); | |
1877 return upper; | |
1878 } else { | |
1879 assert(NULL == linear_search(this, pc_offset, approximate), "search ok"); | |
1880 return NULL; | |
1881 } | |
1882 } | |
1883 | |
1884 | |
1885 bool nmethod::check_all_dependencies() { | |
1886 bool found_check = false; | |
1887 // wholesale check of all dependencies | |
1888 for (Dependencies::DepStream deps(this); deps.next(); ) { | |
1889 if (deps.check_dependency() != NULL) { | |
1890 found_check = true; | |
1891 NOT_DEBUG(break); | |
1892 } | |
1893 } | |
1894 return found_check; // tell caller if we found anything | |
1895 } | |
1896 | |
1897 bool nmethod::check_dependency_on(DepChange& changes) { | |
1898 // What has happened: | |
1899 // 1) a new class dependee has been added | |
1900 // 2) dependee and all its super classes have been marked | |
1901 bool found_check = false; // set true if we are upset | |
1902 for (Dependencies::DepStream deps(this); deps.next(); ) { | |
1903 // Evaluate only relevant dependencies. | |
1904 if (deps.spot_check_dependency_at(changes) != NULL) { | |
1905 found_check = true; | |
1906 NOT_DEBUG(break); | |
1907 } | |
1908 } | |
1909 return found_check; | |
1910 } | |
1911 | |
1912 bool nmethod::is_evol_dependent_on(klassOop dependee) { | |
1913 instanceKlass *dependee_ik = instanceKlass::cast(dependee); | |
1914 objArrayOop dependee_methods = dependee_ik->methods(); | |
1915 for (Dependencies::DepStream deps(this); deps.next(); ) { | |
1916 if (deps.type() == Dependencies::evol_method) { | |
1917 methodOop method = deps.method_argument(0); | |
1918 for (int j = 0; j < dependee_methods->length(); j++) { | |
1919 if ((methodOop) dependee_methods->obj_at(j) == method) { | |
1920 // RC_TRACE macro has an embedded ResourceMark | |
1921 RC_TRACE(0x01000000, | |
1922 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)", | |
1923 _method->method_holder()->klass_part()->external_name(), | |
1924 _method->name()->as_C_string(), | |
1925 _method->signature()->as_C_string(), compile_id(), | |
1926 method->method_holder()->klass_part()->external_name(), | |
1927 method->name()->as_C_string(), | |
1928 method->signature()->as_C_string())); | |
1929 if (TraceDependencies || LogCompilation) | |
1930 deps.log_dependency(dependee); | |
1931 return true; | |
1932 } | |
1933 } | |
1934 } | |
1935 } | |
1936 return false; | |
1937 } | |
1938 | |
1939 // Called from mark_for_deoptimization, when dependee is invalidated. | |
1940 bool nmethod::is_dependent_on_method(methodOop dependee) { | |
1941 for (Dependencies::DepStream deps(this); deps.next(); ) { | |
1942 if (deps.type() != Dependencies::evol_method) | |
1943 continue; | |
1944 methodOop method = deps.method_argument(0); | |
1945 if (method == dependee) return true; | |
1946 } | |
1947 return false; | |
1948 } | |
1949 | |
1950 | |
1951 bool nmethod::is_patchable_at(address instr_addr) { | |
1952 assert (code_contains(instr_addr), "wrong nmethod used"); | |
1953 if (is_zombie()) { | |
1954 // a zombie may never be patched | |
1955 return false; | |
1956 } | |
1957 return true; | |
1958 } | |
1959 | |
1960 | |
1961 address nmethod::continuation_for_implicit_exception(address pc) { | |
1962 // Exception happened outside inline-cache check code => we are inside | |
1963 // an active nmethod => use cpc to determine a return address | |
1964 int exception_offset = pc - instructions_begin(); | |
1965 int cont_offset = ImplicitExceptionTable(this).at( exception_offset ); | |
1966 #ifdef ASSERT | |
1967 if (cont_offset == 0) { | |
1968 Thread* thread = ThreadLocalStorage::get_thread_slow(); | |
1969 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY | |
1970 HandleMark hm(thread); | |
1971 ResourceMark rm(thread); | |
1972 CodeBlob* cb = CodeCache::find_blob(pc); | |
1973 assert(cb != NULL && cb == this, ""); | |
1974 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, pc); | |
1975 print(); | |
1976 method()->print_codes(); | |
1977 print_code(); | |
1978 print_pcs(); | |
1979 } | |
1980 #endif | |
1981 guarantee(cont_offset != 0, "unhandled implicit exception in compiled code"); | |
1982 return instructions_begin() + cont_offset; | |
1983 } | |
1984 | |
1985 | |
1986 | |
1987 void nmethod_init() { | |
1988 // make sure you didn't forget to adjust the filler fields | |
1989 assert(sizeof(nmFlags) <= 4, "nmFlags occupies more than a word"); | |
1990 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word"); | |
1991 } | |
1992 | |
1993 | |
1994 //------------------------------------------------------------------------------------------- | |
1995 | |
1996 | |
1997 // QQQ might we make this work from a frame?? | |
1998 nmethodLocker::nmethodLocker(address pc) { | |
1999 CodeBlob* cb = CodeCache::find_blob(pc); | |
2000 guarantee(cb != NULL && cb->is_nmethod(), "bad pc for a nmethod found"); | |
2001 _nm = (nmethod*)cb; | |
2002 lock_nmethod(_nm); | |
2003 } | |
2004 | |
2005 void nmethodLocker::lock_nmethod(nmethod* nm) { | |
2006 if (nm == NULL) return; | |
2007 Atomic::inc(&nm->_lock_count); | |
2008 guarantee(!nm->is_zombie(), "cannot lock a zombie method"); | |
2009 } | |
2010 | |
2011 void nmethodLocker::unlock_nmethod(nmethod* nm) { | |
2012 if (nm == NULL) return; | |
2013 Atomic::dec(&nm->_lock_count); | |
2014 guarantee(nm->_lock_count >= 0, "unmatched nmethod lock/unlock"); | |
2015 } | |
2016 | |
2017 bool nmethod::is_deopt_pc(address pc) { | |
2018 bool ret = pc == deopt_handler_begin(); | |
2019 return ret; | |
2020 } | |
2021 | |
2022 | |
2023 // ----------------------------------------------------------------------------- | |
2024 // Verification | |
2025 | |
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2026 class VerifyOopsClosure: public OopClosure { |
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2027 nmethod* _nm; |
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2028 bool _ok; |
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2029 public: |
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2030 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { } |
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2031 bool ok() { return _ok; } |
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2032 virtual void do_oop(oop* p) { |
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2033 if ((*p) == NULL || (*p)->is_oop()) return; |
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2034 if (_ok) { |
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2035 _nm->print_nmethod(true); |
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2036 _ok = false; |
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2037 } |
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2038 tty->print_cr("*** non-oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)", |
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2039 (intptr_t)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm)); |
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2040 } |
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2041 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } |
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2042 }; |
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2043 |
0 | 2044 void nmethod::verify() { |
2045 | |
2046 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant | |
2047 // seems odd. | |
2048 | |
2049 if( is_zombie() || is_not_entrant() ) | |
2050 return; | |
2051 | |
2052 // Make sure all the entry points are correctly aligned for patching. | |
2053 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point()); | |
2054 | |
2055 assert(method()->is_oop(), "must be valid"); | |
2056 | |
2057 ResourceMark rm; | |
2058 | |
2059 if (!CodeCache::contains(this)) { | |
2060 fatal1("nmethod at " INTPTR_FORMAT " not in zone", this); | |
2061 } | |
2062 | |
2063 if(is_native_method() ) | |
2064 return; | |
2065 | |
2066 nmethod* nm = CodeCache::find_nmethod(verified_entry_point()); | |
2067 if (nm != this) { | |
2068 fatal1("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", this); | |
2069 } | |
2070 | |
2071 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { | |
2072 if (! p->verify(this)) { | |
2073 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", this); | |
2074 } | |
2075 } | |
2076 | |
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2077 VerifyOopsClosure voc(this); |
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2078 oops_do(&voc); |
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2079 assert(voc.ok(), "embedded oops must be OK"); |
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2080 verify_scavenge_root_oops(); |
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2081 |
0 | 2082 verify_scopes(); |
2083 } | |
2084 | |
2085 | |
2086 void nmethod::verify_interrupt_point(address call_site) { | |
2087 // This code does not work in release mode since | |
2088 // owns_lock only is available in debug mode. | |
2089 CompiledIC* ic = NULL; | |
2090 Thread *cur = Thread::current(); | |
2091 if (CompiledIC_lock->owner() == cur || | |
2092 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) && | |
2093 SafepointSynchronize::is_at_safepoint())) { | |
2094 ic = CompiledIC_at(call_site); | |
2095 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); | |
2096 } else { | |
2097 MutexLocker ml_verify (CompiledIC_lock); | |
2098 ic = CompiledIC_at(call_site); | |
2099 } | |
2100 PcDesc* pd = pc_desc_at(ic->end_of_call()); | |
2101 assert(pd != NULL, "PcDesc must exist"); | |
2102 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(), | |
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2103 pd->obj_decode_offset(), pd->should_reexecute()); |
0 | 2104 !sd->is_top(); sd = sd->sender()) { |
2105 sd->verify(); | |
2106 } | |
2107 } | |
2108 | |
2109 void nmethod::verify_scopes() { | |
2110 if( !method() ) return; // Runtime stubs have no scope | |
2111 if (method()->is_native()) return; // Ignore stub methods. | |
2112 // iterate through all interrupt point | |
2113 // and verify the debug information is valid. | |
2114 RelocIterator iter((nmethod*)this); | |
2115 while (iter.next()) { | |
2116 address stub = NULL; | |
2117 switch (iter.type()) { | |
2118 case relocInfo::virtual_call_type: | |
2119 verify_interrupt_point(iter.addr()); | |
2120 break; | |
2121 case relocInfo::opt_virtual_call_type: | |
2122 stub = iter.opt_virtual_call_reloc()->static_stub(); | |
2123 verify_interrupt_point(iter.addr()); | |
2124 break; | |
2125 case relocInfo::static_call_type: | |
2126 stub = iter.static_call_reloc()->static_stub(); | |
2127 //verify_interrupt_point(iter.addr()); | |
2128 break; | |
2129 case relocInfo::runtime_call_type: | |
2130 address destination = iter.reloc()->value(); | |
2131 // Right now there is no way to find out which entries support | |
2132 // an interrupt point. It would be nice if we had this | |
2133 // information in a table. | |
2134 break; | |
2135 } | |
2136 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section"); | |
2137 } | |
2138 } | |
2139 | |
2140 | |
2141 // ----------------------------------------------------------------------------- | |
2142 // Non-product code | |
2143 #ifndef PRODUCT | |
2144 | |
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2145 class DebugScavengeRoot: public OopClosure { |
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2146 nmethod* _nm; |
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2147 bool _ok; |
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2148 public: |
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2149 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { } |
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2150 bool ok() { return _ok; } |
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2151 virtual void do_oop(oop* p) { |
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2152 if ((*p) == NULL || !(*p)->is_scavengable()) return; |
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2153 if (_ok) { |
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2154 _nm->print_nmethod(true); |
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2155 _ok = false; |
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2156 } |
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2157 tty->print_cr("*** non-perm oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)", |
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2158 (intptr_t)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm)); |
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2159 (*p)->print(); |
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2160 } |
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2161 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } |
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2162 }; |
0 | 2163 |
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2164 void nmethod::verify_scavenge_root_oops() { |
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2165 if (!on_scavenge_root_list()) { |
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2166 // Actually look inside, to verify the claim that it's clean. |
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2167 DebugScavengeRoot debug_scavenge_root(this); |
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2168 oops_do(&debug_scavenge_root); |
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2169 if (!debug_scavenge_root.ok()) |
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2170 fatal("found an unadvertised bad non-perm oop in the code cache"); |
0 | 2171 } |
989
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2172 assert(scavenge_root_not_marked(), ""); |
0 | 2173 } |
2174 | |
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2175 #endif // PRODUCT |
0 | 2176 |
2177 // Printing operations | |
2178 | |
2179 void nmethod::print() const { | |
2180 ResourceMark rm; | |
2181 ttyLocker ttyl; // keep the following output all in one block | |
2182 | |
2183 tty->print("Compiled "); | |
2184 | |
2185 if (is_compiled_by_c1()) { | |
2186 tty->print("(c1) "); | |
2187 } else if (is_compiled_by_c2()) { | |
2188 tty->print("(c2) "); | |
2189 } else { | |
2190 tty->print("(nm) "); | |
2191 } | |
2192 | |
2193 print_on(tty, "nmethod"); | |
2194 tty->cr(); | |
2195 if (WizardMode) { | |
2196 tty->print("((nmethod*) "INTPTR_FORMAT ") ", this); | |
2197 tty->print(" for method " INTPTR_FORMAT , (address)method()); | |
2198 tty->print(" { "); | |
2199 if (version()) tty->print("v%d ", version()); | |
2200 if (level()) tty->print("l%d ", level()); | |
2201 if (is_in_use()) tty->print("in_use "); | |
2202 if (is_not_entrant()) tty->print("not_entrant "); | |
2203 if (is_zombie()) tty->print("zombie "); | |
2204 if (is_unloaded()) tty->print("unloaded "); | |
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2205 if (on_scavenge_root_list()) tty->print("scavenge_root "); |
0 | 2206 tty->print_cr("}:"); |
2207 } | |
2208 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", | |
2209 (address)this, | |
2210 (address)this + size(), | |
2211 size()); | |
2212 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", | |
2213 relocation_begin(), | |
2214 relocation_end(), | |
2215 relocation_size()); | |
2216 if (code_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", | |
2217 code_begin(), | |
2218 code_end(), | |
2219 code_size()); | |
2220 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", | |
2221 stub_begin(), | |
2222 stub_end(), | |
2223 stub_size()); | |
2224 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", | |
2225 consts_begin(), | |
2226 consts_end(), | |
2227 consts_size()); | |
2228 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", | |
2229 scopes_data_begin(), | |
2230 scopes_data_end(), | |
2231 scopes_data_size()); | |
2232 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", | |
2233 scopes_pcs_begin(), | |
2234 scopes_pcs_end(), | |
2235 scopes_pcs_size()); | |
2236 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", | |
2237 dependencies_begin(), | |
2238 dependencies_end(), | |
2239 dependencies_size()); | |
2240 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", | |
2241 handler_table_begin(), | |
2242 handler_table_end(), | |
2243 handler_table_size()); | |
2244 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", | |
2245 nul_chk_table_begin(), | |
2246 nul_chk_table_end(), | |
2247 nul_chk_table_size()); | |
2248 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", | |
2249 oops_begin(), | |
2250 oops_end(), | |
2251 oops_size()); | |
2252 } | |
2253 | |
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2254 void nmethod::print_code() { |
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2255 HandleMark hm; |
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2256 ResourceMark m; |
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2257 Disassembler::decode(this); |
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2258 } |
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2259 |
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2260 |
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2261 #ifndef PRODUCT |
0 | 2262 |
2263 void nmethod::print_scopes() { | |
2264 // Find the first pc desc for all scopes in the code and print it. | |
2265 ResourceMark rm; | |
2266 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { | |
2267 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null) | |
2268 continue; | |
2269 | |
2270 ScopeDesc* sd = scope_desc_at(p->real_pc(this)); | |
2271 sd->print_on(tty, p); | |
2272 } | |
2273 } | |
2274 | |
2275 void nmethod::print_dependencies() { | |
2276 ResourceMark rm; | |
2277 ttyLocker ttyl; // keep the following output all in one block | |
2278 tty->print_cr("Dependencies:"); | |
2279 for (Dependencies::DepStream deps(this); deps.next(); ) { | |
2280 deps.print_dependency(); | |
2281 klassOop ctxk = deps.context_type(); | |
2282 if (ctxk != NULL) { | |
2283 Klass* k = Klass::cast(ctxk); | |
2284 if (k->oop_is_instance() && ((instanceKlass*)k)->is_dependent_nmethod(this)) { | |
30 | 2285 tty->print_cr(" [nmethod<=klass]%s", k->external_name()); |
0 | 2286 } |
2287 } | |
2288 deps.log_dependency(); // put it into the xml log also | |
2289 } | |
2290 } | |
2291 | |
2292 | |
2293 void nmethod::print_relocations() { | |
2294 ResourceMark m; // in case methods get printed via the debugger | |
2295 tty->print_cr("relocations:"); | |
2296 RelocIterator iter(this); | |
2297 iter.print(); | |
2298 if (UseRelocIndex) { | |
2299 jint* index_end = (jint*)relocation_end() - 1; | |
2300 jint index_size = *index_end; | |
2301 jint* index_start = (jint*)( (address)index_end - index_size ); | |
2302 tty->print_cr(" index @" INTPTR_FORMAT ": index_size=%d", index_start, index_size); | |
2303 if (index_size > 0) { | |
2304 jint* ip; | |
2305 for (ip = index_start; ip+2 <= index_end; ip += 2) | |
2306 tty->print_cr(" (%d %d) addr=" INTPTR_FORMAT " @" INTPTR_FORMAT, | |
2307 ip[0], | |
2308 ip[1], | |
2309 header_end()+ip[0], | |
2310 relocation_begin()-1+ip[1]); | |
2311 for (; ip < index_end; ip++) | |
2312 tty->print_cr(" (%d ?)", ip[0]); | |
2313 tty->print_cr(" @" INTPTR_FORMAT ": index_size=%d", ip, *ip++); | |
2314 tty->print_cr("reloc_end @" INTPTR_FORMAT ":", ip); | |
2315 } | |
2316 } | |
2317 } | |
2318 | |
2319 | |
2320 void nmethod::print_pcs() { | |
2321 ResourceMark m; // in case methods get printed via debugger | |
2322 tty->print_cr("pc-bytecode offsets:"); | |
2323 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { | |
2324 p->print(this); | |
2325 } | |
2326 } | |
2327 | |
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2328 #endif // PRODUCT |
0 | 2329 |
2330 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) { | |
2331 RelocIterator iter(this, begin, end); | |
2332 bool have_one = false; | |
2333 while (iter.next()) { | |
2334 have_one = true; | |
2335 switch (iter.type()) { | |
2336 case relocInfo::none: return "no_reloc"; | |
2337 case relocInfo::oop_type: { | |
2338 stringStream st; | |
2339 oop_Relocation* r = iter.oop_reloc(); | |
2340 oop obj = r->oop_value(); | |
2341 st.print("oop("); | |
2342 if (obj == NULL) st.print("NULL"); | |
2343 else obj->print_value_on(&st); | |
2344 st.print(")"); | |
2345 return st.as_string(); | |
2346 } | |
2347 case relocInfo::virtual_call_type: return "virtual_call"; | |
2348 case relocInfo::opt_virtual_call_type: return "optimized virtual_call"; | |
2349 case relocInfo::static_call_type: return "static_call"; | |
2350 case relocInfo::static_stub_type: return "static_stub"; | |
2351 case relocInfo::runtime_call_type: return "runtime_call"; | |
2352 case relocInfo::external_word_type: return "external_word"; | |
2353 case relocInfo::internal_word_type: return "internal_word"; | |
2354 case relocInfo::section_word_type: return "section_word"; | |
2355 case relocInfo::poll_type: return "poll"; | |
2356 case relocInfo::poll_return_type: return "poll_return"; | |
2357 case relocInfo::type_mask: return "type_bit_mask"; | |
2358 } | |
2359 } | |
2360 return have_one ? "other" : NULL; | |
2361 } | |
2362 | |
2363 // Return a the last scope in (begin..end] | |
2364 ScopeDesc* nmethod::scope_desc_in(address begin, address end) { | |
2365 PcDesc* p = pc_desc_near(begin+1); | |
2366 if (p != NULL && p->real_pc(this) <= end) { | |
2367 return new ScopeDesc(this, p->scope_decode_offset(), | |
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2368 p->obj_decode_offset(), p->should_reexecute()); |
0 | 2369 } |
2370 return NULL; | |
2371 } | |
2372 | |
2373 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) { | |
2374 // First, find an oopmap in (begin, end]. | |
2375 // We use the odd half-closed interval so that oop maps and scope descs | |
2376 // which are tied to the byte after a call are printed with the call itself. | |
2377 address base = instructions_begin(); | |
2378 OopMapSet* oms = oop_maps(); | |
2379 if (oms != NULL) { | |
2380 for (int i = 0, imax = oms->size(); i < imax; i++) { | |
2381 OopMap* om = oms->at(i); | |
2382 address pc = base + om->offset(); | |
2383 if (pc > begin) { | |
2384 if (pc <= end) { | |
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2385 st->move_to(column); |
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2386 st->print("; "); |
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2387 om->print_on(st); |
0 | 2388 } |
2389 break; | |
2390 } | |
2391 } | |
2392 } | |
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2393 |
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2394 // Print any debug info present at this pc. |
0 | 2395 ScopeDesc* sd = scope_desc_in(begin, end); |
2396 if (sd != NULL) { | |
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2397 st->move_to(column); |
0 | 2398 if (sd->bci() == SynchronizationEntryBCI) { |
2399 st->print(";*synchronization entry"); | |
2400 } else { | |
2401 if (sd->method().is_null()) { | |
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2402 st->print("method is NULL"); |
0 | 2403 } else if (sd->method()->is_native()) { |
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2404 st->print("method is native"); |
0 | 2405 } else { |
2406 address bcp = sd->method()->bcp_from(sd->bci()); | |
2407 Bytecodes::Code bc = Bytecodes::java_code_at(bcp); | |
2408 st->print(";*%s", Bytecodes::name(bc)); | |
2409 switch (bc) { | |
2410 case Bytecodes::_invokevirtual: | |
2411 case Bytecodes::_invokespecial: | |
2412 case Bytecodes::_invokestatic: | |
2413 case Bytecodes::_invokeinterface: | |
2414 { | |
2415 Bytecode_invoke* invoke = Bytecode_invoke_at(sd->method(), sd->bci()); | |
2416 st->print(" "); | |
2417 if (invoke->name() != NULL) | |
2418 invoke->name()->print_symbol_on(st); | |
2419 else | |
2420 st->print("<UNKNOWN>"); | |
2421 break; | |
2422 } | |
2423 case Bytecodes::_getfield: | |
2424 case Bytecodes::_putfield: | |
2425 case Bytecodes::_getstatic: | |
2426 case Bytecodes::_putstatic: | |
2427 { | |
2428 methodHandle sdm = sd->method(); | |
2429 Bytecode_field* field = Bytecode_field_at(sdm(), sdm->bcp_from(sd->bci())); | |
2430 constantPoolOop sdmc = sdm->constants(); | |
2431 symbolOop name = sdmc->name_ref_at(field->index()); | |
2432 st->print(" "); | |
2433 if (name != NULL) | |
2434 name->print_symbol_on(st); | |
2435 else | |
2436 st->print("<UNKNOWN>"); | |
2437 } | |
2438 } | |
2439 } | |
2440 } | |
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2441 |
0 | 2442 // Print all scopes |
2443 for (;sd != NULL; sd = sd->sender()) { | |
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2444 st->move_to(column); |
0 | 2445 st->print("; -"); |
2446 if (sd->method().is_null()) { | |
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2447 st->print("method is NULL"); |
0 | 2448 } else { |
2449 sd->method()->print_short_name(st); | |
2450 } | |
2451 int lineno = sd->method()->line_number_from_bci(sd->bci()); | |
2452 if (lineno != -1) { | |
2453 st->print("@%d (line %d)", sd->bci(), lineno); | |
2454 } else { | |
2455 st->print("@%d", sd->bci()); | |
2456 } | |
2457 st->cr(); | |
2458 } | |
2459 } | |
2460 | |
2461 // Print relocation information | |
2462 const char* str = reloc_string_for(begin, end); | |
2463 if (str != NULL) { | |
2464 if (sd != NULL) st->cr(); | |
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2465 st->move_to(column); |
0 | 2466 st->print("; {%s}", str); |
2467 } | |
2468 int cont_offset = ImplicitExceptionTable(this).at(begin - instructions_begin()); | |
2469 if (cont_offset != 0) { | |
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2470 st->move_to(column); |
0 | 2471 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, instructions_begin() + cont_offset); |
2472 } | |
2473 | |
2474 } | |
2475 | |
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2476 #ifndef PRODUCT |
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2477 |
0 | 2478 void nmethod::print_value_on(outputStream* st) const { |
2479 print_on(st, "nmethod"); | |
2480 } | |
2481 | |
2482 void nmethod::print_calls(outputStream* st) { | |
2483 RelocIterator iter(this); | |
2484 while (iter.next()) { | |
2485 switch (iter.type()) { | |
2486 case relocInfo::virtual_call_type: | |
2487 case relocInfo::opt_virtual_call_type: { | |
2488 VerifyMutexLocker mc(CompiledIC_lock); | |
2489 CompiledIC_at(iter.reloc())->print(); | |
2490 break; | |
2491 } | |
2492 case relocInfo::static_call_type: | |
2493 st->print_cr("Static call at " INTPTR_FORMAT, iter.reloc()->addr()); | |
2494 compiledStaticCall_at(iter.reloc())->print(); | |
2495 break; | |
2496 } | |
2497 } | |
2498 } | |
2499 | |
2500 void nmethod::print_handler_table() { | |
2501 ExceptionHandlerTable(this).print(); | |
2502 } | |
2503 | |
2504 void nmethod::print_nul_chk_table() { | |
2505 ImplicitExceptionTable(this).print(instructions_begin()); | |
2506 } | |
2507 | |
2508 void nmethod::print_statistics() { | |
2509 ttyLocker ttyl; | |
2510 if (xtty != NULL) xtty->head("statistics type='nmethod'"); | |
2511 nmethod_stats.print_native_nmethod_stats(); | |
2512 nmethod_stats.print_nmethod_stats(); | |
2513 DebugInformationRecorder::print_statistics(); | |
2514 nmethod_stats.print_pc_stats(); | |
2515 Dependencies::print_statistics(); | |
2516 if (xtty != NULL) xtty->tail("statistics"); | |
2517 } | |
2518 | |
2519 #endif // PRODUCT |