1 /*
2 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "code/codeCache.hpp"
27 #include "code/compiledIC.hpp"
28 #include "code/dependencies.hpp"
29 #include "code/nativeInst.hpp"
30 #include "code/nmethod.hpp"
31 #include "code/scopeDesc.hpp"
32 #include "compiler/abstractCompiler.hpp"
33 #include "compiler/compileBroker.hpp"
34 #include "compiler/compileLog.hpp"
35 #include "compiler/compilerDirectives.hpp"
36 #include "compiler/directivesParser.hpp"
37 #include "compiler/disassembler.hpp"
38 #include "interpreter/bytecode.hpp"
39 #include "logging/log.hpp"
40 #include "memory/resourceArea.hpp"
41 #include "oops/methodData.hpp"
42 #include "oops/oop.inline.hpp"
43 #include "prims/jvmtiImpl.hpp"
44 #include "runtime/atomic.inline.hpp"
45 #include "runtime/orderAccess.inline.hpp"
46 #include "runtime/os.hpp"
47 #include "runtime/sharedRuntime.hpp"
48 #include "runtime/sweeper.hpp"
49 #include "utilities/resourceHash.hpp"
50 #include "utilities/dtrace.hpp"
51 #include "utilities/events.hpp"
52 #include "utilities/xmlstream.hpp"
53 #include "logging/log.hpp"
54 #ifdef SHARK
55 #include "shark/sharkCompiler.hpp"
56 #endif
57 #if INCLUDE_JVMCI
58 #include "jvmci/jvmciJavaClasses.hpp"
59 #endif
60
61 #ifdef DTRACE_ENABLED
62
63 // Only bother with this argument setup if dtrace is available
64
65 #define DTRACE_METHOD_UNLOAD_PROBE(method) \
66 { \
67 Method* m = (method); \
68 if (m != NULL) { \
69 Symbol* klass_name = m->klass_name(); \
70 Symbol* name = m->name(); \
71 Symbol* signature = m->signature(); \
72 HOTSPOT_COMPILED_METHOD_UNLOAD( \
73 (char *) klass_name->bytes(), klass_name->utf8_length(), \
74 (char *) name->bytes(), name->utf8_length(), \
75 (char *) signature->bytes(), signature->utf8_length()); \
76 } \
77 }
78
79 #else // ndef DTRACE_ENABLED
80
81 #define DTRACE_METHOD_UNLOAD_PROBE(method)
82
83 #endif
84
85 bool nmethod::is_compiled_by_c1() const {
86 if (compiler() == NULL) {
87 return false;
88 }
89 return compiler()->is_c1();
90 }
91 bool nmethod::is_compiled_by_jvmci() const {
92 if (compiler() == NULL || method() == NULL) return false; // can happen during debug printing
93 if (is_native_method()) return false;
94 return compiler()->is_jvmci();
95 }
96 bool nmethod::is_compiled_by_c2() const {
97 if (compiler() == NULL) {
98 return false;
99 }
100 return compiler()->is_c2();
101 }
102 bool nmethod::is_compiled_by_shark() const {
103 if (compiler() == NULL) {
104 return false;
105 }
106 return compiler()->is_shark();
107 }
108
109
110
111 //---------------------------------------------------------------------------------
112 // NMethod statistics
113 // They are printed under various flags, including:
114 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation.
115 // (In the latter two cases, they like other stats are printed to the log only.)
116
117 #ifndef PRODUCT
118 // These variables are put into one block to reduce relocations
119 // and make it simpler to print from the debugger.
120 struct java_nmethod_stats_struct {
121 int nmethod_count;
122 int total_size;
123 int relocation_size;
124 int consts_size;
125 int insts_size;
126 int stub_size;
127 int scopes_data_size;
128 int scopes_pcs_size;
129 int dependencies_size;
130 int handler_table_size;
131 int nul_chk_table_size;
132 int oops_size;
133 int metadata_size;
134
135 void note_nmethod(nmethod* nm) {
136 nmethod_count += 1;
137 total_size += nm->size();
138 relocation_size += nm->relocation_size();
139 consts_size += nm->consts_size();
140 insts_size += nm->insts_size();
141 stub_size += nm->stub_size();
142 oops_size += nm->oops_size();
143 metadata_size += nm->metadata_size();
144 scopes_data_size += nm->scopes_data_size();
145 scopes_pcs_size += nm->scopes_pcs_size();
146 dependencies_size += nm->dependencies_size();
147 handler_table_size += nm->handler_table_size();
148 nul_chk_table_size += nm->nul_chk_table_size();
149 }
150 void print_nmethod_stats(const char* name) {
151 if (nmethod_count == 0) return;
152 tty->print_cr("Statistics for %d bytecoded nmethods for %s:", nmethod_count, name);
153 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size);
154 if (nmethod_count != 0) tty->print_cr(" header = " SIZE_FORMAT, nmethod_count * sizeof(nmethod));
155 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size);
156 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size);
157 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size);
158 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size);
159 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size);
160 if (metadata_size != 0) tty->print_cr(" metadata = %d", metadata_size);
161 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size);
162 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size);
163 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size);
164 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size);
165 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size);
166 }
167 };
168
169 struct native_nmethod_stats_struct {
170 int native_nmethod_count;
171 int native_total_size;
172 int native_relocation_size;
173 int native_insts_size;
174 int native_oops_size;
175 int native_metadata_size;
176 void note_native_nmethod(nmethod* nm) {
177 native_nmethod_count += 1;
178 native_total_size += nm->size();
179 native_relocation_size += nm->relocation_size();
180 native_insts_size += nm->insts_size();
181 native_oops_size += nm->oops_size();
182 native_metadata_size += nm->metadata_size();
183 }
184 void print_native_nmethod_stats() {
185 if (native_nmethod_count == 0) return;
186 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count);
187 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size);
188 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size);
189 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size);
190 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size);
191 if (native_metadata_size != 0) tty->print_cr(" N. metadata = %d", native_metadata_size);
192 }
193 };
194
195 struct pc_nmethod_stats_struct {
196 int pc_desc_resets; // number of resets (= number of caches)
197 int pc_desc_queries; // queries to nmethod::find_pc_desc
198 int pc_desc_approx; // number of those which have approximate true
199 int pc_desc_repeats; // number of _pc_descs[0] hits
200 int pc_desc_hits; // number of LRU cache hits
201 int pc_desc_tests; // total number of PcDesc examinations
202 int pc_desc_searches; // total number of quasi-binary search steps
203 int pc_desc_adds; // number of LUR cache insertions
204
205 void print_pc_stats() {
206 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query",
207 pc_desc_queries,
208 (double)(pc_desc_tests + pc_desc_searches)
209 / pc_desc_queries);
210 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d",
211 pc_desc_resets,
212 pc_desc_queries, pc_desc_approx,
213 pc_desc_repeats, pc_desc_hits,
214 pc_desc_tests, pc_desc_searches, pc_desc_adds);
215 }
216 };
217
218 #ifdef COMPILER1
219 static java_nmethod_stats_struct c1_java_nmethod_stats;
220 #endif
221 #ifdef COMPILER2
222 static java_nmethod_stats_struct c2_java_nmethod_stats;
223 #endif
224 #if INCLUDE_JVMCI
225 static java_nmethod_stats_struct jvmci_java_nmethod_stats;
226 #endif
227 #ifdef SHARK
228 static java_nmethod_stats_struct shark_java_nmethod_stats;
229 #endif
230 static java_nmethod_stats_struct unknown_java_nmethod_stats;
231
232 static native_nmethod_stats_struct native_nmethod_stats;
233 static pc_nmethod_stats_struct pc_nmethod_stats;
234
235 static void note_java_nmethod(nmethod* nm) {
236 #ifdef COMPILER1
237 if (nm->is_compiled_by_c1()) {
238 c1_java_nmethod_stats.note_nmethod(nm);
239 } else
240 #endif
241 #ifdef COMPILER2
242 if (nm->is_compiled_by_c2()) {
243 c2_java_nmethod_stats.note_nmethod(nm);
244 } else
245 #endif
246 #if INCLUDE_JVMCI
247 if (nm->is_compiled_by_jvmci()) {
248 jvmci_java_nmethod_stats.note_nmethod(nm);
249 } else
250 #endif
251 #ifdef SHARK
252 if (nm->is_compiled_by_shark()) {
253 shark_java_nmethod_stats.note_nmethod(nm);
254 } else
255 #endif
256 {
257 unknown_java_nmethod_stats.note_nmethod(nm);
258 }
259 }
260 #endif // !PRODUCT
261
262 //---------------------------------------------------------------------------------
263
264
265 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) {
266 assert(pc != NULL, "Must be non null");
267 assert(exception.not_null(), "Must be non null");
268 assert(handler != NULL, "Must be non null");
269
270 _count = 0;
271 _exception_type = exception->klass();
272 _next = NULL;
273
274 add_address_and_handler(pc,handler);
275 }
276
277
278 address ExceptionCache::match(Handle exception, address pc) {
279 assert(pc != NULL,"Must be non null");
280 assert(exception.not_null(),"Must be non null");
281 if (exception->klass() == exception_type()) {
282 return (test_address(pc));
283 }
284
285 return NULL;
286 }
287
288
289 bool ExceptionCache::match_exception_with_space(Handle exception) {
290 assert(exception.not_null(),"Must be non null");
291 if (exception->klass() == exception_type() && count() < cache_size) {
292 return true;
293 }
294 return false;
295 }
296
297
298 address ExceptionCache::test_address(address addr) {
299 int limit = count();
300 for (int i = 0; i < limit; i++) {
301 if (pc_at(i) == addr) {
302 return handler_at(i);
303 }
304 }
305 return NULL;
306 }
307
308
309 bool ExceptionCache::add_address_and_handler(address addr, address handler) {
310 if (test_address(addr) == handler) return true;
311
312 int index = count();
313 if (index < cache_size) {
314 set_pc_at(index, addr);
315 set_handler_at(index, handler);
316 increment_count();
317 return true;
318 }
319 return false;
320 }
321
322 //-----------------------------------------------------------------------------
323
324
325 // Helper used by both find_pc_desc methods.
326 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) {
327 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_tests);
328 if (!approximate)
329 return pc->pc_offset() == pc_offset;
330 else
331 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset();
332 }
333
334 void PcDescCache::reset_to(PcDesc* initial_pc_desc) {
335 if (initial_pc_desc == NULL) {
336 _pc_descs[0] = NULL; // native method; no PcDescs at all
337 return;
338 }
339 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_resets);
340 // reset the cache by filling it with benign (non-null) values
341 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel");
342 for (int i = 0; i < cache_size; i++)
343 _pc_descs[i] = initial_pc_desc;
344 }
345
346 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) {
347 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_queries);
348 NOT_PRODUCT(if (approximate) ++pc_nmethod_stats.pc_desc_approx);
349
350 // Note: one might think that caching the most recently
351 // read value separately would be a win, but one would be
352 // wrong. When many threads are updating it, the cache
353 // line it's in would bounce between caches, negating
354 // any benefit.
355
356 // In order to prevent race conditions do not load cache elements
357 // repeatedly, but use a local copy:
358 PcDesc* res;
359
360 // Step one: Check the most recently added value.
361 res = _pc_descs[0];
362 if (res == NULL) return NULL; // native method; no PcDescs at all
363 if (match_desc(res, pc_offset, approximate)) {
364 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_repeats);
365 return res;
366 }
367
368 // Step two: Check the rest of the LRU cache.
369 for (int i = 1; i < cache_size; ++i) {
370 res = _pc_descs[i];
371 if (res->pc_offset() < 0) break; // optimization: skip empty cache
372 if (match_desc(res, pc_offset, approximate)) {
373 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_hits);
374 return res;
375 }
376 }
377
378 // Report failure.
379 return NULL;
380 }
381
382 void PcDescCache::add_pc_desc(PcDesc* pc_desc) {
383 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_adds);
384 // Update the LRU cache by shifting pc_desc forward.
385 for (int i = 0; i < cache_size; i++) {
386 PcDesc* next = _pc_descs[i];
387 _pc_descs[i] = pc_desc;
388 pc_desc = next;
389 }
390 }
391
392 // adjust pcs_size so that it is a multiple of both oopSize and
393 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple
394 // of oopSize, then 2*sizeof(PcDesc) is)
395 static int adjust_pcs_size(int pcs_size) {
396 int nsize = round_to(pcs_size, oopSize);
397 if ((nsize % sizeof(PcDesc)) != 0) {
398 nsize = pcs_size + sizeof(PcDesc);
399 }
400 assert((nsize % oopSize) == 0, "correct alignment");
401 return nsize;
402 }
403
404
405 int nmethod::total_size() const {
406 return
407 consts_size() +
408 insts_size() +
409 stub_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 (is_osr_method()) return "osr";
418 if (method() != NULL && is_native_method()) return "c2n";
419 return NULL;
420 }
421
422 // Fill in default values for various flag fields
423 void nmethod::init_defaults() {
424 _state = in_use;
425 _has_flushed_dependencies = 0;
426 _lock_count = 0;
427 _stack_traversal_mark = 0;
428 _unload_reported = false; // jvmti state
429
430 #ifdef ASSERT
431 _oops_are_stale = false;
432 #endif
433
434 _oops_do_mark_link = NULL;
435 _jmethod_id = NULL;
436 _osr_link = NULL;
437 if (UseG1GC) {
438 _unloading_next = NULL;
439 } else {
440 _scavenge_root_link = NULL;
441 }
442 _scavenge_root_state = 0;
443 _compiler = NULL;
444 #if INCLUDE_RTM_OPT
445 _rtm_state = NoRTM;
446 #endif
447 #if INCLUDE_JVMCI
448 _jvmci_installed_code = NULL;
449 _speculation_log = NULL;
450 #endif
451 }
452
453 nmethod* nmethod::new_native_nmethod(const methodHandle& method,
454 int compile_id,
455 CodeBuffer *code_buffer,
456 int vep_offset,
457 int frame_complete,
458 int frame_size,
459 ByteSize basic_lock_owner_sp_offset,
460 ByteSize basic_lock_sp_offset,
461 OopMapSet* oop_maps) {
462 code_buffer->finalize_oop_references(method);
463 // create nmethod
464 nmethod* nm = NULL;
465 {
466 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
467 int native_nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod));
468 CodeOffsets offsets;
469 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
470 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
471 nm = new (native_nmethod_size, CompLevel_none) nmethod(method(), native_nmethod_size,
472 compile_id, &offsets,
473 code_buffer, frame_size,
474 basic_lock_owner_sp_offset,
475 basic_lock_sp_offset, oop_maps);
476 NOT_PRODUCT(if (nm != NULL) native_nmethod_stats.note_native_nmethod(nm));
477 }
478 // verify nmethod
479 debug_only(if (nm) nm->verify();) // might block
480
481 if (nm != NULL) {
482 nm->log_new_nmethod();
483 }
484
485 return nm;
486 }
487
488 nmethod* nmethod::new_nmethod(const methodHandle& method,
489 int compile_id,
490 int entry_bci,
491 CodeOffsets* offsets,
492 int orig_pc_offset,
493 DebugInformationRecorder* debug_info,
494 Dependencies* dependencies,
495 CodeBuffer* code_buffer, int frame_size,
496 OopMapSet* oop_maps,
497 ExceptionHandlerTable* handler_table,
498 ImplicitExceptionTable* nul_chk_table,
499 AbstractCompiler* compiler,
500 int comp_level
501 #if INCLUDE_JVMCI
502 , Handle installed_code,
503 Handle speculationLog
504 #endif
505 )
506 {
507 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
508 code_buffer->finalize_oop_references(method);
509 // create nmethod
510 nmethod* nm = NULL;
511 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
512 int nmethod_size =
513 CodeBlob::allocation_size(code_buffer, sizeof(nmethod))
514 + adjust_pcs_size(debug_info->pcs_size())
515 + round_to(dependencies->size_in_bytes() , oopSize)
516 + round_to(handler_table->size_in_bytes(), oopSize)
517 + round_to(nul_chk_table->size_in_bytes(), oopSize)
518 + round_to(debug_info->data_size() , oopSize);
519
520 nm = new (nmethod_size, comp_level)
521 nmethod(method(), nmethod_size, compile_id, entry_bci, offsets,
522 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size,
523 oop_maps,
524 handler_table,
525 nul_chk_table,
526 compiler,
527 comp_level
528 #if INCLUDE_JVMCI
529 , installed_code,
530 speculationLog
531 #endif
532 );
533
534 if (nm != NULL) {
535 // To make dependency checking during class loading fast, record
536 // the nmethod dependencies in the classes it is dependent on.
537 // This allows the dependency checking code to simply walk the
538 // class hierarchy above the loaded class, checking only nmethods
539 // which are dependent on those classes. The slow way is to
540 // check every nmethod for dependencies which makes it linear in
541 // the number of methods compiled. For applications with a lot
542 // classes the slow way is too slow.
543 for (Dependencies::DepStream deps(nm); deps.next(); ) {
544 if (deps.type() == Dependencies::call_site_target_value) {
545 // CallSite dependencies are managed on per-CallSite instance basis.
546 oop call_site = deps.argument_oop(0);
547 MethodHandles::add_dependent_nmethod(call_site, nm);
548 } else {
549 Klass* klass = deps.context_type();
550 if (klass == NULL) {
551 continue; // ignore things like evol_method
552 }
553 // record this nmethod as dependent on this klass
554 InstanceKlass::cast(klass)->add_dependent_nmethod(nm);
555 }
556 }
557 NOT_PRODUCT(if (nm != NULL) note_java_nmethod(nm));
558 }
559 }
560 // Do verification and logging outside CodeCache_lock.
561 if (nm != NULL) {
562 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
563 DEBUG_ONLY(nm->verify();)
564 nm->log_new_nmethod();
565 }
566 return nm;
567 }
568
569 // For native wrappers
570 nmethod::nmethod(
571 Method* method,
572 int nmethod_size,
573 int compile_id,
574 CodeOffsets* offsets,
575 CodeBuffer* code_buffer,
576 int frame_size,
577 ByteSize basic_lock_owner_sp_offset,
578 ByteSize basic_lock_sp_offset,
579 OopMapSet* oop_maps )
580 : CompiledMethod(method, "native nmethod", nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false),
581 _native_receiver_sp_offset(basic_lock_owner_sp_offset),
582 _native_basic_lock_sp_offset(basic_lock_sp_offset)
583 {
584 {
585 int scopes_data_offset = 0;
586 int deoptimize_offset = 0;
587 int deoptimize_mh_offset = 0;
588
589 debug_only(NoSafepointVerifier nsv;)
590 assert_locked_or_safepoint(CodeCache_lock);
591
592 init_defaults();
593 _entry_bci = InvocationEntryBci;
594 // We have no exception handler or deopt handler make the
595 // values something that will never match a pc like the nmethod vtable entry
596 _exception_offset = 0;
597 _orig_pc_offset = 0;
598
599 _consts_offset = data_offset();
600 _stub_offset = data_offset();
601 _oops_offset = data_offset();
602 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize);
603 scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize);
604 _scopes_pcs_offset = scopes_data_offset;
605 _dependencies_offset = _scopes_pcs_offset;
606 _handler_table_offset = _dependencies_offset;
607 _nul_chk_table_offset = _handler_table_offset;
608 _nmethod_end_offset = _nul_chk_table_offset;
609 _compile_id = compile_id;
610 _comp_level = CompLevel_none;
611 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
612 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
613 _osr_entry_point = NULL;
614 _exception_cache = NULL;
615 _pc_desc_container.reset_to(NULL);
616 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
617
618 _scopes_data_begin = (address) this + scopes_data_offset;
619 _deopt_handler_begin = (address) this + deoptimize_offset;
620 _deopt_mh_handler_begin = (address) this + deoptimize_mh_offset;
621
622 code_buffer->copy_code_and_locs_to(this);
623 code_buffer->copy_values_to(this);
624 if (ScavengeRootsInCode) {
625 if (detect_scavenge_root_oops()) {
626 CodeCache::add_scavenge_root_nmethod(this);
627 }
628 GC::gc()->heap()->register_nmethod(this);
629 }
630 debug_only(verify_scavenge_root_oops());
631 CodeCache::commit(this);
632 }
633
634 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
635 ttyLocker ttyl; // keep the following output all in one block
636 // This output goes directly to the tty, not the compiler log.
637 // To enable tools to match it up with the compilation activity,
638 // be sure to tag this tty output with the compile ID.
639 if (xtty != NULL) {
640 xtty->begin_head("print_native_nmethod");
641 xtty->method(_method);
642 xtty->stamp();
643 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
644 }
645 // print the header part first
646 print();
647 // then print the requested information
648 if (PrintNativeNMethods) {
649 print_code();
650 if (oop_maps != NULL) {
651 oop_maps->print();
652 }
653 }
654 if (PrintRelocations) {
655 print_relocations();
656 }
657 if (xtty != NULL) {
658 xtty->tail("print_native_nmethod");
659 }
660 }
661 }
662
663 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () {
664 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level));
665 }
666
667 nmethod::nmethod(
668 Method* method,
669 int nmethod_size,
670 int compile_id,
671 int entry_bci,
672 CodeOffsets* offsets,
673 int orig_pc_offset,
674 DebugInformationRecorder* debug_info,
675 Dependencies* dependencies,
676 CodeBuffer *code_buffer,
677 int frame_size,
678 OopMapSet* oop_maps,
679 ExceptionHandlerTable* handler_table,
680 ImplicitExceptionTable* nul_chk_table,
681 AbstractCompiler* compiler,
682 int comp_level
683 #if INCLUDE_JVMCI
684 , Handle installed_code,
685 Handle speculation_log
686 #endif
687 )
688 : CompiledMethod(method, "nmethod", nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false),
689 _native_receiver_sp_offset(in_ByteSize(-1)),
690 _native_basic_lock_sp_offset(in_ByteSize(-1))
691 {
692 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
693 {
694 debug_only(NoSafepointVerifier nsv;)
695 assert_locked_or_safepoint(CodeCache_lock);
696
697 _deopt_handler_begin = (address) this;
698 _deopt_mh_handler_begin = (address) this;
699
700 init_defaults();
701 _entry_bci = entry_bci;
702 _compile_id = compile_id;
703 _comp_level = comp_level;
704 _compiler = compiler;
705 _orig_pc_offset = orig_pc_offset;
706 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
707
708 // Section offsets
709 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts());
710 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs());
711
712 #if INCLUDE_JVMCI
713 _jvmci_installed_code = installed_code();
714 _speculation_log = (instanceOop)speculation_log();
715
716 if (compiler->is_jvmci()) {
717 // JVMCI might not produce any stub sections
718 if (offsets->value(CodeOffsets::Exceptions) != -1) {
719 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions);
720 } else {
721 _exception_offset = -1;
722 }
723 if (offsets->value(CodeOffsets::Deopt) != -1) {
724 _deopt_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::Deopt);
725 } else {
726 _deopt_handler_begin = NULL;
727 }
728 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
729 _deopt_mh_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::DeoptMH);
730 } else {
731 _deopt_mh_handler_begin = NULL;
732 }
733 } else {
734 #endif
735 // Exception handler and deopt handler are in the stub section
736 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set");
737 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set");
738
739 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
740 _deopt_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::Deopt);
741 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
742 _deopt_mh_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::DeoptMH);
743 } else {
744 _deopt_mh_handler_begin = NULL;
745 #if INCLUDE_JVMCI
746 }
747 #endif
748 }
749 if (offsets->value(CodeOffsets::UnwindHandler) != -1) {
750 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler);
751 } else {
752 _unwind_handler_offset = -1;
753 }
754
755 _oops_offset = data_offset();
756 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize);
757 int scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize);
758
759 _scopes_pcs_offset = scopes_data_offset + round_to(debug_info->data_size (), oopSize);
760 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
761 _handler_table_offset = _dependencies_offset + round_to(dependencies->size_in_bytes (), oopSize);
762 _nul_chk_table_offset = _handler_table_offset + round_to(handler_table->size_in_bytes(), oopSize);
763 _nmethod_end_offset = _nul_chk_table_offset + round_to(nul_chk_table->size_in_bytes(), oopSize);
764 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
765 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
766 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry);
767 _exception_cache = NULL;
768
769 _scopes_data_begin = (address) this + scopes_data_offset;
770
771 _pc_desc_container.reset_to(scopes_pcs_begin());
772
773 code_buffer->copy_code_and_locs_to(this);
774 // Copy contents of ScopeDescRecorder to nmethod
775 code_buffer->copy_values_to(this);
776 debug_info->copy_to(this);
777 dependencies->copy_to(this);
778 if (ScavengeRootsInCode) {
779 if (detect_scavenge_root_oops()) {
780 CodeCache::add_scavenge_root_nmethod(this);
781 }
782 GC::gc()->heap()->register_nmethod(this);
783 }
784 debug_only(verify_scavenge_root_oops());
785
786 CodeCache::commit(this);
787
788 // Copy contents of ExceptionHandlerTable to nmethod
789 handler_table->copy_to(this);
790 nul_chk_table->copy_to(this);
791
792 // we use the information of entry points to find out if a method is
793 // static or non static
794 assert(compiler->is_c2() || compiler->is_jvmci() ||
795 _method->is_static() == (entry_point() == _verified_entry_point),
796 " entry points must be same for static methods and vice versa");
797 }
798 }
799
800 // Print a short set of xml attributes to identify this nmethod. The
801 // output should be embedded in some other element.
802 void nmethod::log_identity(xmlStream* log) const {
803 log->print(" compile_id='%d'", compile_id());
804 const char* nm_kind = compile_kind();
805 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind);
806 if (compiler() != NULL) {
807 log->print(" compiler='%s'", compiler()->name());
808 }
809 if (TieredCompilation) {
810 log->print(" level='%d'", comp_level());
811 }
812 }
813
814
815 #define LOG_OFFSET(log, name) \
816 if (p2i(name##_end()) - p2i(name##_begin())) \
817 log->print(" " XSTR(name) "_offset='" INTX_FORMAT "'" , \
818 p2i(name##_begin()) - p2i(this))
819
820
821 void nmethod::log_new_nmethod() const {
822 if (LogCompilation && xtty != NULL) {
823 ttyLocker ttyl;
824 HandleMark hm;
825 xtty->begin_elem("nmethod");
826 log_identity(xtty);
827 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size());
828 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this));
829
830 LOG_OFFSET(xtty, relocation);
831 LOG_OFFSET(xtty, consts);
832 LOG_OFFSET(xtty, insts);
833 LOG_OFFSET(xtty, stub);
834 LOG_OFFSET(xtty, scopes_data);
835 LOG_OFFSET(xtty, scopes_pcs);
836 LOG_OFFSET(xtty, dependencies);
837 LOG_OFFSET(xtty, handler_table);
838 LOG_OFFSET(xtty, nul_chk_table);
839 LOG_OFFSET(xtty, oops);
840 LOG_OFFSET(xtty, metadata);
841
842 xtty->method(method());
843 xtty->stamp();
844 xtty->end_elem();
845 }
846 }
847
848 #undef LOG_OFFSET
849
850
851 // Print out more verbose output usually for a newly created nmethod.
852 void nmethod::print_on(outputStream* st, const char* msg) const {
853 if (st != NULL) {
854 ttyLocker ttyl;
855 if (WizardMode) {
856 CompileTask::print(st, this, msg, /*short_form:*/ true);
857 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this));
858 } else {
859 CompileTask::print(st, this, msg, /*short_form:*/ false);
860 }
861 }
862 }
863
864 void nmethod::maybe_print_nmethod(DirectiveSet* directive) {
865 bool printnmethods = directive->PrintAssemblyOption || directive->PrintNMethodsOption;
866 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
867 print_nmethod(printnmethods);
868 }
869 }
870
871 void nmethod::print_nmethod(bool printmethod) {
872 ttyLocker ttyl; // keep the following output all in one block
873 if (xtty != NULL) {
874 xtty->begin_head("print_nmethod");
875 xtty->stamp();
876 xtty->end_head();
877 }
878 // print the header part first
879 print();
880 // then print the requested information
881 if (printmethod) {
882 print_code();
883 print_pcs();
884 if (oop_maps()) {
885 oop_maps()->print();
886 }
887 }
888 if (printmethod || PrintDebugInfo || CompilerOracle::has_option_string(_method, "PrintDebugInfo")) {
889 print_scopes();
890 }
891 if (printmethod || PrintRelocations || CompilerOracle::has_option_string(_method, "PrintRelocations")) {
892 print_relocations();
893 }
894 if (printmethod || PrintDependencies || CompilerOracle::has_option_string(_method, "PrintDependencies")) {
895 print_dependencies();
896 }
897 if (printmethod || PrintExceptionHandlers) {
898 print_handler_table();
899 print_nul_chk_table();
900 }
901 if (printmethod) {
902 print_recorded_oops();
903 print_recorded_metadata();
904 }
905 if (xtty != NULL) {
906 xtty->tail("print_nmethod");
907 }
908 }
909
910
911 // Promote one word from an assembly-time handle to a live embedded oop.
912 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
913 if (handle == NULL ||
914 // As a special case, IC oops are initialized to 1 or -1.
915 handle == (jobject) Universe::non_oop_word()) {
916 (*dest) = (oop) handle;
917 } else {
918 (*dest) = JNIHandles::resolve_non_null(handle);
919 }
920 }
921
922
923 // Have to have the same name because it's called by a template
924 void nmethod::copy_values(GrowableArray<jobject>* array) {
925 int length = array->length();
926 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
927 oop* dest = oops_begin();
928 for (int index = 0 ; index < length; index++) {
929 initialize_immediate_oop(&dest[index], array->at(index));
930 }
931
932 // Now we can fix up all the oops in the code. We need to do this
933 // in the code because the assembler uses jobjects as placeholders.
934 // The code and relocations have already been initialized by the
935 // CodeBlob constructor, so it is valid even at this early point to
936 // iterate over relocations and patch the code.
937 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true);
938 }
939
940 void nmethod::copy_values(GrowableArray<Metadata*>* array) {
941 int length = array->length();
942 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough");
943 Metadata** dest = metadata_begin();
944 for (int index = 0 ; index < length; index++) {
945 dest[index] = array->at(index);
946 }
947 }
948
949 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) {
950 // re-patch all oop-bearing instructions, just in case some oops moved
951 RelocIterator iter(this, begin, end);
952 while (iter.next()) {
953 if (iter.type() == relocInfo::oop_type) {
954 oop_Relocation* reloc = iter.oop_reloc();
955 if (initialize_immediates && reloc->oop_is_immediate()) {
956 oop* dest = reloc->oop_addr();
957 initialize_immediate_oop(dest, (jobject) *dest);
958 }
959 // Refresh the oop-related bits of this instruction.
960 reloc->fix_oop_relocation();
961 } else if (iter.type() == relocInfo::metadata_type) {
962 metadata_Relocation* reloc = iter.metadata_reloc();
963 reloc->fix_metadata_relocation();
964 }
965 }
966 }
967
968
969 void nmethod::verify_clean_inline_caches() {
970 assert_locked_or_safepoint(CompiledIC_lock);
971
972 // If the method is not entrant or zombie then a JMP is plastered over the
973 // first few bytes. If an oop in the old code was there, that oop
974 // should not get GC'd. Skip the first few bytes of oops on
975 // not-entrant methods.
976 address low_boundary = verified_entry_point();
977 if (!is_in_use()) {
978 low_boundary += NativeJump::instruction_size;
979 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
980 // This means that the low_boundary is going to be a little too high.
981 // This shouldn't matter, since oops of non-entrant methods are never used.
982 // In fact, why are we bothering to look at oops in a non-entrant method??
983 }
984
985 ResourceMark rm;
986 RelocIterator iter(this, low_boundary);
987 while(iter.next()) {
988 switch(iter.type()) {
989 case relocInfo::virtual_call_type:
990 case relocInfo::opt_virtual_call_type: {
991 CompiledIC *ic = CompiledIC_at(&iter);
992 // Ok, to lookup references to zombies here
993 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
994 nmethod* nm = cb->as_nmethod_or_null();
995 if( nm != NULL ) {
996 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
997 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
998 assert(ic->is_clean(), "IC should be clean");
999 }
1000 }
1001 break;
1002 }
1003 case relocInfo::static_call_type: {
1004 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
1005 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
1006 nmethod* nm = cb->as_nmethod_or_null();
1007 if( nm != NULL ) {
1008 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
1009 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1010 assert(csc->is_clean(), "IC should be clean");
1011 }
1012 }
1013 break;
1014 }
1015 }
1016 }
1017 }
1018
1019 // This is a private interface with the sweeper.
1020 void nmethod::mark_as_seen_on_stack() {
1021 assert(is_alive(), "Must be an alive method");
1022 // Set the traversal mark to ensure that the sweeper does 2
1023 // cleaning passes before moving to zombie.
1024 set_stack_traversal_mark(NMethodSweeper::traversal_count());
1025 }
1026
1027 // Tell if a non-entrant method can be converted to a zombie (i.e.,
1028 // there are no activations on the stack, not in use by the VM,
1029 // and not in use by the ServiceThread)
1030 bool nmethod::can_convert_to_zombie() {
1031 assert(is_not_entrant(), "must be a non-entrant method");
1032
1033 // Since the nmethod sweeper only does partial sweep the sweeper's traversal
1034 // count can be greater than the stack traversal count before it hits the
1035 // nmethod for the second time.
1036 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count() &&
1037 !is_locked_by_vm();
1038 }
1039
1040 void nmethod::inc_decompile_count() {
1041 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return;
1042 // Could be gated by ProfileTraps, but do not bother...
1043 Method* m = method();
1044 if (m == NULL) return;
1045 MethodData* mdo = m->method_data();
1046 if (mdo == NULL) return;
1047 // There is a benign race here. See comments in methodData.hpp.
1048 mdo->inc_decompile_count();
1049 }
1050
1051 void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) {
1052
1053 post_compiled_method_unload();
1054
1055 // Since this nmethod is being unloaded, make sure that dependencies
1056 // recorded in instanceKlasses get flushed and pass non-NULL closure to
1057 // indicate that this work is being done during a GC.
1058 assert(GC::gc()->heap()->is_gc_active(), "should only be called during gc");
1059 assert(is_alive != NULL, "Should be non-NULL");
1060 // A non-NULL is_alive closure indicates that this is being called during GC.
1061 flush_dependencies(is_alive);
1062
1063 // Break cycle between nmethod & method
1064 if (log_is_enabled(Trace, class, unload)) {
1065 outputStream* log = Log(class, unload)::trace_stream();
1066 log->print_cr("making nmethod " INTPTR_FORMAT
1067 " unloadable, Method*(" INTPTR_FORMAT
1068 "), cause(" INTPTR_FORMAT ")",
1069 p2i(this), p2i(_method), p2i(cause));
1070 if (!GC::gc()->heap()->is_gc_active())
1071 cause->klass()->print_on(log);
1072 }
1073 // Unlink the osr method, so we do not look this up again
1074 if (is_osr_method()) {
1075 // Invalidate the osr nmethod only once
1076 if (is_in_use()) {
1077 invalidate_osr_method();
1078 }
1079 #ifdef ASSERT
1080 if (method() != NULL) {
1081 // Make sure osr nmethod is invalidated, i.e. not on the list
1082 bool found = method()->method_holder()->remove_osr_nmethod(this);
1083 assert(!found, "osr nmethod should have been invalidated");
1084 }
1085 #endif
1086 }
1087
1088 // If _method is already NULL the Method* is about to be unloaded,
1089 // so we don't have to break the cycle. Note that it is possible to
1090 // have the Method* live here, in case we unload the nmethod because
1091 // it is pointing to some oop (other than the Method*) being unloaded.
1092 if (_method != NULL) {
1093 // OSR methods point to the Method*, but the Method* does not
1094 // point back!
1095 if (_method->code() == this) {
1096 _method->clear_code(); // Break a cycle
1097 }
1098 _method = NULL; // Clear the method of this dead nmethod
1099 }
1100
1101 // Make the class unloaded - i.e., change state and notify sweeper
1102 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
1103 if (is_in_use()) {
1104 // Transitioning directly from live to unloaded -- so
1105 // we need to force a cache clean-up; remember this
1106 // for later on.
1107 CodeCache::set_needs_cache_clean(true);
1108 }
1109
1110 // Unregister must be done before the state change
1111 GC::gc()->heap()->unregister_nmethod(this);
1112
1113 _state = unloaded;
1114
1115 // Log the unloading.
1116 log_state_change();
1117
1118 #if INCLUDE_JVMCI
1119 // The method can only be unloaded after the pointer to the installed code
1120 // Java wrapper is no longer alive. Here we need to clear out this weak
1121 // reference to the dead object. Nulling out the reference has to happen
1122 // after the method is unregistered since the original value may be still
1123 // tracked by the rset.
1124 maybe_invalidate_installed_code();
1125 // Clear these out after the nmethod has been unregistered and any
1126 // updates to the InstalledCode instance have been performed.
1127 _jvmci_installed_code = NULL;
1128 _speculation_log = NULL;
1129 #endif
1130
1131 // The Method* is gone at this point
1132 assert(_method == NULL, "Tautology");
1133
1134 set_osr_link(NULL);
1135 NMethodSweeper::report_state_change(this);
1136 }
1137
1138 void nmethod::invalidate_osr_method() {
1139 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
1140 // Remove from list of active nmethods
1141 if (method() != NULL) {
1142 method()->method_holder()->remove_osr_nmethod(this);
1143 }
1144 }
1145
1146 void nmethod::log_state_change() const {
1147 if (LogCompilation) {
1148 if (xtty != NULL) {
1149 ttyLocker ttyl; // keep the following output all in one block
1150 if (_state == unloaded) {
1151 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'",
1152 os::current_thread_id());
1153 } else {
1154 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s",
1155 os::current_thread_id(),
1156 (_state == zombie ? " zombie='1'" : ""));
1157 }
1158 log_identity(xtty);
1159 xtty->stamp();
1160 xtty->end_elem();
1161 }
1162 }
1163 if (PrintCompilation && _state != unloaded) {
1164 print_on(tty, _state == zombie ? "made zombie" : "made not entrant");
1165 }
1166 }
1167
1168 /**
1169 * Common functionality for both make_not_entrant and make_zombie
1170 */
1171 bool nmethod::make_not_entrant_or_zombie(unsigned int state) {
1172 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant");
1173 assert(!is_zombie(), "should not already be a zombie");
1174
1175 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below.
1176 nmethodLocker nml(this);
1177 methodHandle the_method(method());
1178 NoSafepointVerifier nsv;
1179
1180 // during patching, depending on the nmethod state we must notify the GC that
1181 // code has been unloaded, unregistering it. We cannot do this right while
1182 // holding the Patching_lock because we need to use the CodeCache_lock. This
1183 // would be prone to deadlocks.
1184 // This flag is used to remember whether we need to later lock and unregister.
1185 bool nmethod_needs_unregister = false;
1186
1187 {
1188 // invalidate osr nmethod before acquiring the patching lock since
1189 // they both acquire leaf locks and we don't want a deadlock.
1190 // This logic is equivalent to the logic below for patching the
1191 // verified entry point of regular methods. We check that the
1192 // nmethod is in use to ensure that it is invalidated only once.
1193 if (is_osr_method() && is_in_use()) {
1194 // this effectively makes the osr nmethod not entrant
1195 invalidate_osr_method();
1196 }
1197
1198 // Enter critical section. Does not block for safepoint.
1199 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1200
1201 if (_state == state) {
1202 // another thread already performed this transition so nothing
1203 // to do, but return false to indicate this.
1204 return false;
1205 }
1206
1207 // The caller can be calling the method statically or through an inline
1208 // cache call.
1209 if (!is_osr_method() && !is_not_entrant()) {
1210 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
1211 SharedRuntime::get_handle_wrong_method_stub());
1212 }
1213
1214 if (is_in_use() && update_recompile_counts()) {
1215 // It's a true state change, so mark the method as decompiled.
1216 // Do it only for transition from alive.
1217 inc_decompile_count();
1218 }
1219
1220 // If the state is becoming a zombie, signal to unregister the nmethod with
1221 // the heap.
1222 // This nmethod may have already been unloaded during a full GC.
1223 if ((state == zombie) && !is_unloaded()) {
1224 nmethod_needs_unregister = true;
1225 }
1226
1227 // Must happen before state change. Otherwise we have a race condition in
1228 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately
1229 // transition its state from 'not_entrant' to 'zombie' without having to wait
1230 // for stack scanning.
1231 if (state == not_entrant) {
1232 mark_as_seen_on_stack();
1233 OrderAccess::storestore();
1234 }
1235
1236 // Change state
1237 _state = state;
1238
1239 // Log the transition once
1240 log_state_change();
1241
1242 // Invalidate while holding the patching lock
1243 JVMCI_ONLY(maybe_invalidate_installed_code());
1244
1245 // Remove nmethod from method.
1246 // We need to check if both the _code and _from_compiled_code_entry_point
1247 // refer to this nmethod because there is a race in setting these two fields
1248 // in Method* as seen in bugid 4947125.
1249 // If the vep() points to the zombie nmethod, the memory for the nmethod
1250 // could be flushed and the compiler and vtable stubs could still call
1251 // through it.
1252 if (method() != NULL && (method()->code() == this ||
1253 method()->from_compiled_entry() == verified_entry_point())) {
1254 HandleMark hm;
1255 method()->clear_code();
1256 }
1257 } // leave critical region under Patching_lock
1258
1259 #ifdef ASSERT
1260 if (is_osr_method() && method() != NULL) {
1261 // Make sure osr nmethod is invalidated, i.e. not on the list
1262 bool found = method()->method_holder()->remove_osr_nmethod(this);
1263 assert(!found, "osr nmethod should have been invalidated");
1264 }
1265 #endif
1266
1267 // When the nmethod becomes zombie it is no longer alive so the
1268 // dependencies must be flushed. nmethods in the not_entrant
1269 // state will be flushed later when the transition to zombie
1270 // happens or they get unloaded.
1271 if (state == zombie) {
1272 {
1273 // Flushing dependencies must be done before any possible
1274 // safepoint can sneak in, otherwise the oops used by the
1275 // dependency logic could have become stale.
1276 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1277 if (nmethod_needs_unregister) {
1278 GC::gc()->heap()->unregister_nmethod(this);
1279 #ifdef JVMCI
1280 _jvmci_installed_code = NULL;
1281 _speculation_log = NULL;
1282 #endif
1283 }
1284 flush_dependencies(NULL);
1285 }
1286
1287 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload
1288 // event and it hasn't already been reported for this nmethod then
1289 // report it now. The event may have been reported earlier if the GC
1290 // marked it for unloading). JvmtiDeferredEventQueue support means
1291 // we no longer go to a safepoint here.
1292 post_compiled_method_unload();
1293
1294 #ifdef ASSERT
1295 // It's no longer safe to access the oops section since zombie
1296 // nmethods aren't scanned for GC.
1297 _oops_are_stale = true;
1298 #endif
1299 // the Method may be reclaimed by class unloading now that the
1300 // nmethod is in zombie state
1301 set_method(NULL);
1302 } else {
1303 assert(state == not_entrant, "other cases may need to be handled differently");
1304 }
1305
1306 if (TraceCreateZombies) {
1307 ResourceMark m;
1308 tty->print_cr("nmethod <" INTPTR_FORMAT "> %s code made %s", p2i(this), this->method() ? this->method()->name_and_sig_as_C_string() : "null", (state == not_entrant) ? "not entrant" : "zombie");
1309 }
1310
1311 NMethodSweeper::report_state_change(this);
1312 return true;
1313 }
1314
1315 void nmethod::flush() {
1316 // Note that there are no valid oops in the nmethod anymore.
1317 assert(!is_osr_method() || is_unloaded() || is_zombie(),
1318 "osr nmethod must be unloaded or zombie before flushing");
1319 assert(is_zombie() || is_osr_method(), "must be a zombie method");
1320 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed");
1321 assert_locked_or_safepoint(CodeCache_lock);
1322
1323 // completely deallocate this method
1324 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, p2i(this));
1325 if (PrintMethodFlushing) {
1326 tty->print_cr("*flushing %s nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT
1327 "/Free CodeCache:" SIZE_FORMAT "Kb",
1328 is_osr_method() ? "osr" : "",_compile_id, p2i(this), CodeCache::blob_count(),
1329 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024);
1330 }
1331
1332 // We need to deallocate any ExceptionCache data.
1333 // Note that we do not need to grab the nmethod lock for this, it
1334 // better be thread safe if we're disposing of it!
1335 ExceptionCache* ec = exception_cache();
1336 set_exception_cache(NULL);
1337 while(ec != NULL) {
1338 ExceptionCache* next = ec->next();
1339 delete ec;
1340 ec = next;
1341 }
1342
1343 if (on_scavenge_root_list()) {
1344 CodeCache::drop_scavenge_root_nmethod(this);
1345 }
1346
1347 #ifdef SHARK
1348 ((SharkCompiler *) compiler())->free_compiled_method(insts_begin());
1349 #endif // SHARK
1350
1351 CodeBlob::flush();
1352 CodeCache::free(this);
1353 }
1354
1355 //
1356 // Notify all classes this nmethod is dependent on that it is no
1357 // longer dependent. This should only be called in two situations.
1358 // First, when a nmethod transitions to a zombie all dependents need
1359 // to be clear. Since zombification happens at a safepoint there's no
1360 // synchronization issues. The second place is a little more tricky.
1361 // During phase 1 of mark sweep class unloading may happen and as a
1362 // result some nmethods may get unloaded. In this case the flushing
1363 // of dependencies must happen during phase 1 since after GC any
1364 // dependencies in the unloaded nmethod won't be updated, so
1365 // traversing the dependency information in unsafe. In that case this
1366 // function is called with a non-NULL argument and this function only
1367 // notifies instanceKlasses that are reachable
1368
1369 void nmethod::flush_dependencies(BoolObjectClosure* is_alive) {
1370 assert_locked_or_safepoint(CodeCache_lock);
1371 assert(GC::gc()->heap()->is_gc_active() == (is_alive != NULL),
1372 "is_alive is non-NULL if and only if we are called during GC");
1373 if (!has_flushed_dependencies()) {
1374 set_has_flushed_dependencies();
1375 for (Dependencies::DepStream deps(this); deps.next(); ) {
1376 if (deps.type() == Dependencies::call_site_target_value) {
1377 // CallSite dependencies are managed on per-CallSite instance basis.
1378 oop call_site = deps.argument_oop(0);
1379 MethodHandles::remove_dependent_nmethod(call_site, this);
1380 } else {
1381 Klass* klass = deps.context_type();
1382 if (klass == NULL) {
1383 continue; // ignore things like evol_method
1384 }
1385 // During GC the is_alive closure is non-NULL, and is used to
1386 // determine liveness of dependees that need to be updated.
1387 if (is_alive == NULL || klass->is_loader_alive(is_alive)) {
1388 // The GC defers deletion of this entry, since there might be multiple threads
1389 // iterating over the _dependencies graph. Other call paths are single-threaded
1390 // and may delete it immediately.
1391 bool delete_immediately = is_alive == NULL;
1392 InstanceKlass::cast(klass)->remove_dependent_nmethod(this, delete_immediately);
1393 }
1394 }
1395 }
1396 }
1397 }
1398
1399
1400 // If this oop is not live, the nmethod can be unloaded.
1401 bool nmethod::can_unload(BoolObjectClosure* is_alive, oop* root, bool unloading_occurred) {
1402 assert(root != NULL, "just checking");
1403 oop obj = *root;
1404 if (obj == NULL || is_alive->do_object_b(obj)) {
1405 return false;
1406 }
1407
1408 // If ScavengeRootsInCode is true, an nmethod might be unloaded
1409 // simply because one of its constant oops has gone dead.
1410 // No actual classes need to be unloaded in order for this to occur.
1411 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading");
1412 make_unloaded(is_alive, obj);
1413 return true;
1414 }
1415
1416 // ------------------------------------------------------------------
1417 // post_compiled_method_load_event
1418 // new method for install_code() path
1419 // Transfer information from compilation to jvmti
1420 void nmethod::post_compiled_method_load_event() {
1421
1422 Method* moop = method();
1423 HOTSPOT_COMPILED_METHOD_LOAD(
1424 (char *) moop->klass_name()->bytes(),
1425 moop->klass_name()->utf8_length(),
1426 (char *) moop->name()->bytes(),
1427 moop->name()->utf8_length(),
1428 (char *) moop->signature()->bytes(),
1429 moop->signature()->utf8_length(),
1430 insts_begin(), insts_size());
1431
1432 if (JvmtiExport::should_post_compiled_method_load() ||
1433 JvmtiExport::should_post_compiled_method_unload()) {
1434 get_and_cache_jmethod_id();
1435 }
1436
1437 if (JvmtiExport::should_post_compiled_method_load()) {
1438 // Let the Service thread (which is a real Java thread) post the event
1439 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1440 JvmtiDeferredEventQueue::enqueue(
1441 JvmtiDeferredEvent::compiled_method_load_event(this));
1442 }
1443 }
1444
1445 jmethodID nmethod::get_and_cache_jmethod_id() {
1446 if (_jmethod_id == NULL) {
1447 // Cache the jmethod_id since it can no longer be looked up once the
1448 // method itself has been marked for unloading.
1449 _jmethod_id = method()->jmethod_id();
1450 }
1451 return _jmethod_id;
1452 }
1453
1454 void nmethod::post_compiled_method_unload() {
1455 if (unload_reported()) {
1456 // During unloading we transition to unloaded and then to zombie
1457 // and the unloading is reported during the first transition.
1458 return;
1459 }
1460
1461 assert(_method != NULL && !is_unloaded(), "just checking");
1462 DTRACE_METHOD_UNLOAD_PROBE(method());
1463
1464 // If a JVMTI agent has enabled the CompiledMethodUnload event then
1465 // post the event. Sometime later this nmethod will be made a zombie
1466 // by the sweeper but the Method* will not be valid at that point.
1467 // If the _jmethod_id is null then no load event was ever requested
1468 // so don't bother posting the unload. The main reason for this is
1469 // that the jmethodID is a weak reference to the Method* so if
1470 // it's being unloaded there's no way to look it up since the weak
1471 // ref will have been cleared.
1472 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) {
1473 assert(!unload_reported(), "already unloaded");
1474 JvmtiDeferredEvent event =
1475 JvmtiDeferredEvent::compiled_method_unload_event(this,
1476 _jmethod_id, insts_begin());
1477 if (SafepointSynchronize::is_at_safepoint()) {
1478 // Don't want to take the queueing lock. Add it as pending and
1479 // it will get enqueued later.
1480 JvmtiDeferredEventQueue::add_pending_event(event);
1481 } else {
1482 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1483 JvmtiDeferredEventQueue::enqueue(event);
1484 }
1485 }
1486
1487 // The JVMTI CompiledMethodUnload event can be enabled or disabled at
1488 // any time. As the nmethod is being unloaded now we mark it has
1489 // having the unload event reported - this will ensure that we don't
1490 // attempt to report the event in the unlikely scenario where the
1491 // event is enabled at the time the nmethod is made a zombie.
1492 set_unload_reported();
1493 }
1494
1495 bool nmethod::unload_if_dead_at(RelocIterator* iter_at_oop, BoolObjectClosure *is_alive, bool unloading_occurred) {
1496 assert(iter_at_oop->type() == relocInfo::oop_type, "Wrong relocation type");
1497
1498 oop_Relocation* r = iter_at_oop->oop_reloc();
1499 // Traverse those oops directly embedded in the code.
1500 // Other oops (oop_index>0) are seen as part of scopes_oops.
1501 assert(1 == (r->oop_is_immediate()) +
1502 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1503 "oop must be found in exactly one place");
1504 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1505 // Unload this nmethod if the oop is dead.
1506 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) {
1507 return true;;
1508 }
1509 }
1510
1511 return false;
1512 }
1513
1514 bool nmethod::do_unloading_scopes(BoolObjectClosure* is_alive, bool unloading_occurred) {
1515 // Scopes
1516 for (oop* p = oops_begin(); p < oops_end(); p++) {
1517 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1518 if (can_unload(is_alive, p, unloading_occurred)) {
1519 return true;
1520 }
1521 }
1522 return false;
1523 }
1524
1525 bool nmethod::do_unloading_oops(address low_boundary, BoolObjectClosure* is_alive, bool unloading_occurred) {
1526 // Compiled code
1527 {
1528 RelocIterator iter(this, low_boundary);
1529 while (iter.next()) {
1530 if (iter.type() == relocInfo::oop_type) {
1531 if (unload_if_dead_at(&iter, is_alive, unloading_occurred)) {
1532 return true;
1533 }
1534 }
1535 }
1536 }
1537
1538 return do_unloading_scopes(is_alive, unloading_occurred);
1539 }
1540
1541 #if INCLUDE_JVMCI
1542 bool nmethod::do_unloading_jvmci(BoolObjectClosure* is_alive, bool unloading_occurred) {
1543 bool is_unloaded = false;
1544 // Follow JVMCI method
1545 BarrierSet* bs = GC::gc()->heap()->barrier_set();
1546 if (_jvmci_installed_code != NULL) {
1547 if (_jvmci_installed_code->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(_jvmci_installed_code)) {
1548 if (!is_alive->do_object_b(_jvmci_installed_code)) {
1549 clear_jvmci_installed_code();
1550 }
1551 } else {
1552 if (can_unload(is_alive, (oop*)&_jvmci_installed_code, unloading_occurred)) {
1553 return true;
1554 }
1555 }
1556 }
1557
1558 if (_speculation_log != NULL) {
1559 if (!is_alive->do_object_b(_speculation_log)) {
1560 bs->write_ref_nmethod_pre(&_speculation_log, this);
1561 _speculation_log = NULL;
1562 bs->write_ref_nmethod_post(&_speculation_log, this);
1563 }
1564 }
1565 return is_unloaded;
1566 }
1567 #endif
1568
1569 // Iterate over metadata calling this function. Used by RedefineClasses
1570 void nmethod::metadata_do(void f(Metadata*)) {
1571 address low_boundary = verified_entry_point();
1572 if (is_not_entrant()) {
1573 low_boundary += NativeJump::instruction_size;
1574 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1575 // (See comment above.)
1576 }
1577 {
1578 // Visit all immediate references that are embedded in the instruction stream.
1579 RelocIterator iter(this, low_boundary);
1580 while (iter.next()) {
1581 if (iter.type() == relocInfo::metadata_type ) {
1582 metadata_Relocation* r = iter.metadata_reloc();
1583 // In this metadata, we must only follow those metadatas directly embedded in
1584 // the code. Other metadatas (oop_index>0) are seen as part of
1585 // the metadata section below.
1586 assert(1 == (r->metadata_is_immediate()) +
1587 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
1588 "metadata must be found in exactly one place");
1589 if (r->metadata_is_immediate() && r->metadata_value() != NULL) {
1590 Metadata* md = r->metadata_value();
1591 if (md != _method) f(md);
1592 }
1593 } else if (iter.type() == relocInfo::virtual_call_type) {
1594 // Check compiledIC holders associated with this nmethod
1595 CompiledIC *ic = CompiledIC_at(&iter);
1596 if (ic->is_icholder_call()) {
1597 CompiledICHolder* cichk = ic->cached_icholder();
1598 f(cichk->holder_method());
1599 f(cichk->holder_klass());
1600 } else {
1601 Metadata* ic_oop = ic->cached_metadata();
1602 if (ic_oop != NULL) {
1603 f(ic_oop);
1604 }
1605 }
1606 }
1607 }
1608 }
1609
1610 // Visit the metadata section
1611 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
1612 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops
1613 Metadata* md = *p;
1614 f(md);
1615 }
1616
1617 // Visit metadata not embedded in the other places.
1618 if (_method != NULL) f(_method);
1619 }
1620
1621 void nmethod::oops_do(OopClosure* f, bool allow_zombie) {
1622 // make sure the oops ready to receive visitors
1623 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod");
1624 assert(!is_unloaded(), "should not call follow on unloaded nmethod");
1625
1626 // If the method is not entrant or zombie then a JMP is plastered over the
1627 // first few bytes. If an oop in the old code was there, that oop
1628 // should not get GC'd. Skip the first few bytes of oops on
1629 // not-entrant methods.
1630 address low_boundary = verified_entry_point();
1631 if (is_not_entrant()) {
1632 low_boundary += NativeJump::instruction_size;
1633 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1634 // (See comment above.)
1635 }
1636
1637 #if INCLUDE_JVMCI
1638 if (_jvmci_installed_code != NULL) {
1639 f->do_oop((oop*) &_jvmci_installed_code);
1640 }
1641 if (_speculation_log != NULL) {
1642 f->do_oop((oop*) &_speculation_log);
1643 }
1644 #endif
1645
1646 RelocIterator iter(this, low_boundary);
1647
1648 while (iter.next()) {
1649 if (iter.type() == relocInfo::oop_type ) {
1650 oop_Relocation* r = iter.oop_reloc();
1651 // In this loop, we must only follow those oops directly embedded in
1652 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1653 assert(1 == (r->oop_is_immediate()) +
1654 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1655 "oop must be found in exactly one place");
1656 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1657 f->do_oop(r->oop_addr());
1658 }
1659 }
1660 }
1661
1662 // Scopes
1663 // This includes oop constants not inlined in the code stream.
1664 for (oop* p = oops_begin(); p < oops_end(); p++) {
1665 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1666 f->do_oop(p);
1667 }
1668 }
1669
1670 #define NMETHOD_SENTINEL ((nmethod*)badAddress)
1671
1672 nmethod* volatile nmethod::_oops_do_mark_nmethods;
1673
1674 // An nmethod is "marked" if its _mark_link is set non-null.
1675 // Even if it is the end of the linked list, it will have a non-null link value,
1676 // as long as it is on the list.
1677 // This code must be MP safe, because it is used from parallel GC passes.
1678 bool nmethod::test_set_oops_do_mark() {
1679 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");
1680 nmethod* observed_mark_link = _oops_do_mark_link;
1681 if (observed_mark_link == NULL) {
1682 // Claim this nmethod for this thread to mark.
1683 observed_mark_link = (nmethod*)
1684 Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_link, NULL);
1685 if (observed_mark_link == NULL) {
1686
1687 // Atomically append this nmethod (now claimed) to the head of the list:
1688 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods;
1689 for (;;) {
1690 nmethod* required_mark_nmethods = observed_mark_nmethods;
1691 _oops_do_mark_link = required_mark_nmethods;
1692 observed_mark_nmethods = (nmethod*)
1693 Atomic::cmpxchg_ptr(this, &_oops_do_mark_nmethods, required_mark_nmethods);
1694 if (observed_mark_nmethods == required_mark_nmethods)
1695 break;
1696 }
1697 // Mark was clear when we first saw this guy.
1698 if (TraceScavenge) { print_on(tty, "oops_do, mark"); }
1699 return false;
1700 }
1701 }
1702 // On fall through, another racing thread marked this nmethod before we did.
1703 return true;
1704 }
1705
1706 void nmethod::oops_do_marking_prologue() {
1707 if (TraceScavenge) { tty->print_cr("[oops_do_marking_prologue"); }
1708 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row");
1709 // We use cmpxchg_ptr instead of regular assignment here because the user
1710 // may fork a bunch of threads, and we need them all to see the same state.
1711 void* observed = Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, NULL);
1712 guarantee(observed == NULL, "no races in this sequential code");
1713 }
1714
1715 void nmethod::oops_do_marking_epilogue() {
1716 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row");
1717 nmethod* cur = _oops_do_mark_nmethods;
1718 while (cur != NMETHOD_SENTINEL) {
1719 assert(cur != NULL, "not NULL-terminated");
1720 nmethod* next = cur->_oops_do_mark_link;
1721 cur->_oops_do_mark_link = NULL;
1722 DEBUG_ONLY(cur->verify_oop_relocations());
1723 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark"));
1724 cur = next;
1725 }
1726 void* required = _oops_do_mark_nmethods;
1727 void* observed = Atomic::cmpxchg_ptr(NULL, &_oops_do_mark_nmethods, required);
1728 guarantee(observed == required, "no races in this sequential code");
1729 if (TraceScavenge) { tty->print_cr("oops_do_marking_epilogue]"); }
1730 }
1731
1732 class DetectScavengeRoot: public OopClosure {
1733 bool _detected_scavenge_root;
1734 public:
1735 DetectScavengeRoot() : _detected_scavenge_root(false)
1736 { NOT_PRODUCT(_print_nm = NULL); }
1737 bool detected_scavenge_root() { return _detected_scavenge_root; }
1738 virtual void do_oop(oop* p) {
1739 if ((*p) != NULL && (*p)->is_scavengable()) {
1740 NOT_PRODUCT(maybe_print(p));
1741 _detected_scavenge_root = true;
1742 }
1743 }
1744 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
1745
1746 #ifndef PRODUCT
1747 nmethod* _print_nm;
1748 void maybe_print(oop* p) {
1749 if (_print_nm == NULL) return;
1750 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root");
1751 tty->print_cr("" PTR_FORMAT "[offset=%d] detected scavengable oop " PTR_FORMAT " (found at " PTR_FORMAT ")",
1752 p2i(_print_nm), (int)((intptr_t)p - (intptr_t)_print_nm),
1753 p2i(*p), p2i(p));
1754 (*p)->print();
1755 }
1756 #endif //PRODUCT
1757 };
1758
1759 bool nmethod::detect_scavenge_root_oops() {
1760 DetectScavengeRoot detect_scavenge_root;
1761 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this);
1762 oops_do(&detect_scavenge_root);
1763 return detect_scavenge_root.detected_scavenge_root();
1764 }
1765
1766 inline bool includes(void* p, void* from, void* to) {
1767 return from <= p && p < to;
1768 }
1769
1770
1771 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
1772 assert(count >= 2, "must be sentinel values, at least");
1773
1774 #ifdef ASSERT
1775 // must be sorted and unique; we do a binary search in find_pc_desc()
1776 int prev_offset = pcs[0].pc_offset();
1777 assert(prev_offset == PcDesc::lower_offset_limit,
1778 "must start with a sentinel");
1779 for (int i = 1; i < count; i++) {
1780 int this_offset = pcs[i].pc_offset();
1781 assert(this_offset > prev_offset, "offsets must be sorted");
1782 prev_offset = this_offset;
1783 }
1784 assert(prev_offset == PcDesc::upper_offset_limit,
1785 "must end with a sentinel");
1786 #endif //ASSERT
1787
1788 // Search for MethodHandle invokes and tag the nmethod.
1789 for (int i = 0; i < count; i++) {
1790 if (pcs[i].is_method_handle_invoke()) {
1791 set_has_method_handle_invokes(true);
1792 break;
1793 }
1794 }
1795 assert(has_method_handle_invokes() == (_deopt_mh_handler_begin != NULL), "must have deopt mh handler");
1796
1797 int size = count * sizeof(PcDesc);
1798 assert(scopes_pcs_size() >= size, "oob");
1799 memcpy(scopes_pcs_begin(), pcs, size);
1800
1801 // Adjust the final sentinel downward.
1802 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
1803 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
1804 last_pc->set_pc_offset(content_size() + 1);
1805 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
1806 // Fill any rounding gaps with copies of the last record.
1807 last_pc[1] = last_pc[0];
1808 }
1809 // The following assert could fail if sizeof(PcDesc) is not
1810 // an integral multiple of oopSize (the rounding term).
1811 // If it fails, change the logic to always allocate a multiple
1812 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
1813 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
1814 }
1815
1816 void nmethod::copy_scopes_data(u_char* buffer, int size) {
1817 assert(scopes_data_size() >= size, "oob");
1818 memcpy(scopes_data_begin(), buffer, size);
1819 }
1820
1821 #ifdef ASSERT
1822 static PcDesc* linear_search(const PcDescSearch& search, int pc_offset, bool approximate) {
1823 PcDesc* lower = search.scopes_pcs_begin();
1824 PcDesc* upper = search.scopes_pcs_end();
1825 lower += 1; // exclude initial sentinel
1826 PcDesc* res = NULL;
1827 for (PcDesc* p = lower; p < upper; p++) {
1828 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc
1829 if (match_desc(p, pc_offset, approximate)) {
1830 if (res == NULL)
1831 res = p;
1832 else
1833 res = (PcDesc*) badAddress;
1834 }
1835 }
1836 return res;
1837 }
1838 #endif
1839
1840
1841 // Finds a PcDesc with real-pc equal to "pc"
1842 PcDesc* PcDescContainer::find_pc_desc_internal(address pc, bool approximate, const PcDescSearch& search) {
1843 address base_address = search.code_begin();
1844 if ((pc < base_address) ||
1845 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
1846 return NULL; // PC is wildly out of range
1847 }
1848 int pc_offset = (int) (pc - base_address);
1849
1850 // Check the PcDesc cache if it contains the desired PcDesc
1851 // (This as an almost 100% hit rate.)
1852 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
1853 if (res != NULL) {
1854 assert(res == linear_search(search, pc_offset, approximate), "cache ok");
1855 return res;
1856 }
1857
1858 // Fallback algorithm: quasi-linear search for the PcDesc
1859 // Find the last pc_offset less than the given offset.
1860 // The successor must be the required match, if there is a match at all.
1861 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
1862 PcDesc* lower = search.scopes_pcs_begin();
1863 PcDesc* upper = search.scopes_pcs_end();
1864 upper -= 1; // exclude final sentinel
1865 if (lower >= upper) return NULL; // native method; no PcDescs at all
1866
1867 #define assert_LU_OK \
1868 /* invariant on lower..upper during the following search: */ \
1869 assert(lower->pc_offset() < pc_offset, "sanity"); \
1870 assert(upper->pc_offset() >= pc_offset, "sanity")
1871 assert_LU_OK;
1872
1873 // Use the last successful return as a split point.
1874 PcDesc* mid = _pc_desc_cache.last_pc_desc();
1875 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1876 if (mid->pc_offset() < pc_offset) {
1877 lower = mid;
1878 } else {
1879 upper = mid;
1880 }
1881
1882 // Take giant steps at first (4096, then 256, then 16, then 1)
1883 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
1884 const int RADIX = (1 << LOG2_RADIX);
1885 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
1886 while ((mid = lower + step) < upper) {
1887 assert_LU_OK;
1888 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1889 if (mid->pc_offset() < pc_offset) {
1890 lower = mid;
1891 } else {
1892 upper = mid;
1893 break;
1894 }
1895 }
1896 assert_LU_OK;
1897 }
1898
1899 // Sneak up on the value with a linear search of length ~16.
1900 while (true) {
1901 assert_LU_OK;
1902 mid = lower + 1;
1903 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1904 if (mid->pc_offset() < pc_offset) {
1905 lower = mid;
1906 } else {
1907 upper = mid;
1908 break;
1909 }
1910 }
1911 #undef assert_LU_OK
1912
1913 if (match_desc(upper, pc_offset, approximate)) {
1914 assert(upper == linear_search(search, pc_offset, approximate), "search ok");
1915 _pc_desc_cache.add_pc_desc(upper);
1916 return upper;
1917 } else {
1918 assert(NULL == linear_search(search, pc_offset, approximate), "search ok");
1919 return NULL;
1920 }
1921 }
1922
1923
1924 void nmethod::check_all_dependencies(DepChange& changes) {
1925 // Checked dependencies are allocated into this ResourceMark
1926 ResourceMark rm;
1927
1928 // Turn off dependency tracing while actually testing dependencies.
1929 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) );
1930
1931 typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash,
1932 &DependencySignature::equals, 11027> DepTable;
1933
1934 DepTable* table = new DepTable();
1935
1936 // Iterate over live nmethods and check dependencies of all nmethods that are not
1937 // marked for deoptimization. A particular dependency is only checked once.
1938 NMethodIterator iter;
1939 while(iter.next()) {
1940 nmethod* nm = iter.method();
1941 // Only notify for live nmethods
1942 if (nm->is_alive() && !nm->is_marked_for_deoptimization()) {
1943 for (Dependencies::DepStream deps(nm); deps.next(); ) {
1944 // Construct abstraction of a dependency.
1945 DependencySignature* current_sig = new DependencySignature(deps);
1946
1947 // Determine if dependency is already checked. table->put(...) returns
1948 // 'true' if the dependency is added (i.e., was not in the hashtable).
1949 if (table->put(*current_sig, 1)) {
1950 if (deps.check_dependency() != NULL) {
1951 // Dependency checking failed. Print out information about the failed
1952 // dependency and finally fail with an assert. We can fail here, since
1953 // dependency checking is never done in a product build.
1954 tty->print_cr("Failed dependency:");
1955 changes.print();
1956 nm->print();
1957 nm->print_dependencies();
1958 assert(false, "Should have been marked for deoptimization");
1959 }
1960 }
1961 }
1962 }
1963 }
1964 }
1965
1966 bool nmethod::check_dependency_on(DepChange& changes) {
1967 // What has happened:
1968 // 1) a new class dependee has been added
1969 // 2) dependee and all its super classes have been marked
1970 bool found_check = false; // set true if we are upset
1971 for (Dependencies::DepStream deps(this); deps.next(); ) {
1972 // Evaluate only relevant dependencies.
1973 if (deps.spot_check_dependency_at(changes) != NULL) {
1974 found_check = true;
1975 NOT_DEBUG(break);
1976 }
1977 }
1978 return found_check;
1979 }
1980
1981 bool nmethod::is_evol_dependent_on(Klass* dependee) {
1982 InstanceKlass *dependee_ik = InstanceKlass::cast(dependee);
1983 Array<Method*>* dependee_methods = dependee_ik->methods();
1984 for (Dependencies::DepStream deps(this); deps.next(); ) {
1985 if (deps.type() == Dependencies::evol_method) {
1986 Method* method = deps.method_argument(0);
1987 for (int j = 0; j < dependee_methods->length(); j++) {
1988 if (dependee_methods->at(j) == method) {
1989 if (log_is_enabled(Debug, redefine, class, nmethod)) {
1990 ResourceMark rm;
1991 log_debug(redefine, class, nmethod)
1992 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)",
1993 _method->method_holder()->external_name(),
1994 _method->name()->as_C_string(),
1995 _method->signature()->as_C_string(),
1996 compile_id(),
1997 method->method_holder()->external_name(),
1998 method->name()->as_C_string(),
1999 method->signature()->as_C_string());
2000 }
2001 if (TraceDependencies || LogCompilation)
2002 deps.log_dependency(dependee);
2003 return true;
2004 }
2005 }
2006 }
2007 }
2008 return false;
2009 }
2010
2011 // Called from mark_for_deoptimization, when dependee is invalidated.
2012 bool nmethod::is_dependent_on_method(Method* dependee) {
2013 for (Dependencies::DepStream deps(this); deps.next(); ) {
2014 if (deps.type() != Dependencies::evol_method)
2015 continue;
2016 Method* method = deps.method_argument(0);
2017 if (method == dependee) return true;
2018 }
2019 return false;
2020 }
2021
2022
2023 bool nmethod::is_patchable_at(address instr_addr) {
2024 assert(insts_contains(instr_addr), "wrong nmethod used");
2025 if (is_zombie()) {
2026 // a zombie may never be patched
2027 return false;
2028 }
2029 return true;
2030 }
2031
2032
2033 address nmethod::continuation_for_implicit_exception(address pc) {
2034 // Exception happened outside inline-cache check code => we are inside
2035 // an active nmethod => use cpc to determine a return address
2036 int exception_offset = pc - code_begin();
2037 int cont_offset = ImplicitExceptionTable(this).at( exception_offset );
2038 #ifdef ASSERT
2039 if (cont_offset == 0) {
2040 Thread* thread = Thread::current();
2041 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
2042 HandleMark hm(thread);
2043 ResourceMark rm(thread);
2044 CodeBlob* cb = CodeCache::find_blob(pc);
2045 assert(cb != NULL && cb == this, "");
2046 ttyLocker ttyl;
2047 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, p2i(pc));
2048 print();
2049 method()->print_codes();
2050 print_code();
2051 print_pcs();
2052 }
2053 #endif
2054 if (cont_offset == 0) {
2055 // Let the normal error handling report the exception
2056 return NULL;
2057 }
2058 return code_begin() + cont_offset;
2059 }
2060
2061
2062
2063 void nmethod_init() {
2064 // make sure you didn't forget to adjust the filler fields
2065 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
2066 }
2067
2068
2069 //-------------------------------------------------------------------------------------------
2070
2071
2072 // QQQ might we make this work from a frame??
2073 nmethodLocker::nmethodLocker(address pc) {
2074 CodeBlob* cb = CodeCache::find_blob(pc);
2075 guarantee(cb != NULL && cb->is_compiled(), "bad pc for a nmethod found");
2076 _nm = cb->as_compiled_method();
2077 lock_nmethod(_nm);
2078 }
2079
2080 // Only JvmtiDeferredEvent::compiled_method_unload_event()
2081 // should pass zombie_ok == true.
2082 void nmethodLocker::lock_nmethod(CompiledMethod* cm, bool zombie_ok) {
2083 if (cm == NULL) return;
2084 nmethod* nm = cm->as_nmethod();
2085 Atomic::inc(&nm->_lock_count);
2086 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method");
2087 }
2088
2089 void nmethodLocker::unlock_nmethod(CompiledMethod* cm) {
2090 if (cm == NULL) return;
2091 nmethod* nm = cm->as_nmethod();
2092 Atomic::dec(&nm->_lock_count);
2093 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock");
2094 }
2095
2096
2097 // -----------------------------------------------------------------------------
2098 // Verification
2099
2100 class VerifyOopsClosure: public OopClosure {
2101 nmethod* _nm;
2102 bool _ok;
2103 public:
2104 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
2105 bool ok() { return _ok; }
2106 virtual void do_oop(oop* p) {
2107 if ((*p) == NULL || (*p)->is_oop()) return;
2108 if (_ok) {
2109 _nm->print_nmethod(true);
2110 _ok = false;
2111 }
2112 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2113 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2114 }
2115 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2116 };
2117
2118 void nmethod::verify() {
2119
2120 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant
2121 // seems odd.
2122
2123 if (is_zombie() || is_not_entrant() || is_unloaded())
2124 return;
2125
2126 // Make sure all the entry points are correctly aligned for patching.
2127 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
2128
2129 // assert(method()->is_oop(), "must be valid");
2130
2131 ResourceMark rm;
2132
2133 if (!CodeCache::contains(this)) {
2134 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this));
2135 }
2136
2137 if(is_native_method() )
2138 return;
2139
2140 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
2141 if (nm != this) {
2142 fatal("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this));
2143 }
2144
2145 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2146 if (! p->verify(this)) {
2147 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this));
2148 }
2149 }
2150
2151 VerifyOopsClosure voc(this);
2152 oops_do(&voc);
2153 assert(voc.ok(), "embedded oops must be OK");
2154 verify_scavenge_root_oops();
2155
2156 verify_scopes();
2157 }
2158
2159
2160 void nmethod::verify_interrupt_point(address call_site) {
2161 // Verify IC only when nmethod installation is finished.
2162 bool is_installed = (method()->code() == this) // nmethod is in state 'in_use' and installed
2163 || !this->is_in_use(); // nmethod is installed, but not in 'in_use' state
2164 if (is_installed) {
2165 Thread *cur = Thread::current();
2166 if (CompiledIC_lock->owner() == cur ||
2167 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) &&
2168 SafepointSynchronize::is_at_safepoint())) {
2169 CompiledIC_at(this, call_site);
2170 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
2171 } else {
2172 MutexLocker ml_verify (CompiledIC_lock);
2173 CompiledIC_at(this, call_site);
2174 }
2175 }
2176
2177 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address());
2178 assert(pd != NULL, "PcDesc must exist");
2179 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(),
2180 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(),
2181 pd->return_oop());
2182 !sd->is_top(); sd = sd->sender()) {
2183 sd->verify();
2184 }
2185 }
2186
2187 void nmethod::verify_scopes() {
2188 if( !method() ) return; // Runtime stubs have no scope
2189 if (method()->is_native()) return; // Ignore stub methods.
2190 // iterate through all interrupt point
2191 // and verify the debug information is valid.
2192 RelocIterator iter((nmethod*)this);
2193 while (iter.next()) {
2194 address stub = NULL;
2195 switch (iter.type()) {
2196 case relocInfo::virtual_call_type:
2197 verify_interrupt_point(iter.addr());
2198 break;
2199 case relocInfo::opt_virtual_call_type:
2200 stub = iter.opt_virtual_call_reloc()->static_stub();
2201 verify_interrupt_point(iter.addr());
2202 break;
2203 case relocInfo::static_call_type:
2204 stub = iter.static_call_reloc()->static_stub();
2205 //verify_interrupt_point(iter.addr());
2206 break;
2207 case relocInfo::runtime_call_type:
2208 address destination = iter.reloc()->value();
2209 // Right now there is no way to find out which entries support
2210 // an interrupt point. It would be nice if we had this
2211 // information in a table.
2212 break;
2213 }
2214 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section");
2215 }
2216 }
2217
2218
2219 // -----------------------------------------------------------------------------
2220 // Non-product code
2221 #ifndef PRODUCT
2222
2223 class DebugScavengeRoot: public OopClosure {
2224 nmethod* _nm;
2225 bool _ok;
2226 public:
2227 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { }
2228 bool ok() { return _ok; }
2229 virtual void do_oop(oop* p) {
2230 if ((*p) == NULL || !(*p)->is_scavengable()) return;
2231 if (_ok) {
2232 _nm->print_nmethod(true);
2233 _ok = false;
2234 }
2235 tty->print_cr("*** scavengable oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2236 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2237 (*p)->print();
2238 }
2239 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2240 };
2241
2242 void nmethod::verify_scavenge_root_oops() {
2243 if (UseG1GC) {
2244 return;
2245 }
2246
2247 if (!on_scavenge_root_list()) {
2248 // Actually look inside, to verify the claim that it's clean.
2249 DebugScavengeRoot debug_scavenge_root(this);
2250 oops_do(&debug_scavenge_root);
2251 if (!debug_scavenge_root.ok())
2252 fatal("found an unadvertised bad scavengable oop in the code cache");
2253 }
2254 assert(scavenge_root_not_marked(), "");
2255 }
2256
2257 #endif // PRODUCT
2258
2259 // Printing operations
2260
2261 void nmethod::print() const {
2262 ResourceMark rm;
2263 ttyLocker ttyl; // keep the following output all in one block
2264
2265 tty->print("Compiled method ");
2266
2267 if (is_compiled_by_c1()) {
2268 tty->print("(c1) ");
2269 } else if (is_compiled_by_c2()) {
2270 tty->print("(c2) ");
2271 } else if (is_compiled_by_shark()) {
2272 tty->print("(shark) ");
2273 } else if (is_compiled_by_jvmci()) {
2274 tty->print("(JVMCI) ");
2275 } else {
2276 tty->print("(nm) ");
2277 }
2278
2279 print_on(tty, NULL);
2280
2281 if (WizardMode) {
2282 tty->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this));
2283 tty->print(" for method " INTPTR_FORMAT , p2i(method()));
2284 tty->print(" { ");
2285 tty->print_cr("%s ", state());
2286 if (on_scavenge_root_list()) tty->print("scavenge_root ");
2287 tty->print_cr("}:");
2288 }
2289 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2290 p2i(this),
2291 p2i(this) + size(),
2292 size());
2293 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2294 p2i(relocation_begin()),
2295 p2i(relocation_end()),
2296 relocation_size());
2297 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2298 p2i(consts_begin()),
2299 p2i(consts_end()),
2300 consts_size());
2301 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2302 p2i(insts_begin()),
2303 p2i(insts_end()),
2304 insts_size());
2305 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2306 p2i(stub_begin()),
2307 p2i(stub_end()),
2308 stub_size());
2309 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2310 p2i(oops_begin()),
2311 p2i(oops_end()),
2312 oops_size());
2313 if (metadata_size () > 0) tty->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2314 p2i(metadata_begin()),
2315 p2i(metadata_end()),
2316 metadata_size());
2317 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2318 p2i(scopes_data_begin()),
2319 p2i(scopes_data_end()),
2320 scopes_data_size());
2321 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2322 p2i(scopes_pcs_begin()),
2323 p2i(scopes_pcs_end()),
2324 scopes_pcs_size());
2325 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2326 p2i(dependencies_begin()),
2327 p2i(dependencies_end()),
2328 dependencies_size());
2329 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2330 p2i(handler_table_begin()),
2331 p2i(handler_table_end()),
2332 handler_table_size());
2333 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2334 p2i(nul_chk_table_begin()),
2335 p2i(nul_chk_table_end()),
2336 nul_chk_table_size());
2337 }
2338
2339 #ifndef PRODUCT
2340
2341 void nmethod::print_scopes() {
2342 // Find the first pc desc for all scopes in the code and print it.
2343 ResourceMark rm;
2344 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2345 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
2346 continue;
2347
2348 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
2349 while (sd != NULL) {
2350 sd->print_on(tty, p);
2351 sd = sd->sender();
2352 }
2353 }
2354 }
2355
2356 void nmethod::print_dependencies() {
2357 ResourceMark rm;
2358 ttyLocker ttyl; // keep the following output all in one block
2359 tty->print_cr("Dependencies:");
2360 for (Dependencies::DepStream deps(this); deps.next(); ) {
2361 deps.print_dependency();
2362 Klass* ctxk = deps.context_type();
2363 if (ctxk != NULL) {
2364 if (ctxk->is_instance_klass() && InstanceKlass::cast(ctxk)->is_dependent_nmethod(this)) {
2365 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name());
2366 }
2367 }
2368 deps.log_dependency(); // put it into the xml log also
2369 }
2370 }
2371
2372
2373 void nmethod::print_relocations() {
2374 ResourceMark m; // in case methods get printed via the debugger
2375 tty->print_cr("relocations:");
2376 RelocIterator iter(this);
2377 iter.print();
2378 if (UseRelocIndex) {
2379 jint* index_end = (jint*)relocation_end() - 1;
2380 jint index_size = *index_end;
2381 jint* index_start = (jint*)( (address)index_end - index_size );
2382 tty->print_cr(" index @" INTPTR_FORMAT ": index_size=%d", p2i(index_start), index_size);
2383 if (index_size > 0) {
2384 jint* ip;
2385 for (ip = index_start; ip+2 <= index_end; ip += 2)
2386 tty->print_cr(" (%d %d) addr=" INTPTR_FORMAT " @" INTPTR_FORMAT,
2387 ip[0],
2388 ip[1],
2389 p2i(header_end()+ip[0]),
2390 p2i(relocation_begin()-1+ip[1]));
2391 for (; ip < index_end; ip++)
2392 tty->print_cr(" (%d ?)", ip[0]);
2393 tty->print_cr(" @" INTPTR_FORMAT ": index_size=%d", p2i(ip), *ip);
2394 ip++;
2395 tty->print_cr("reloc_end @" INTPTR_FORMAT ":", p2i(ip));
2396 }
2397 }
2398 }
2399
2400
2401 void nmethod::print_pcs() {
2402 ResourceMark m; // in case methods get printed via debugger
2403 tty->print_cr("pc-bytecode offsets:");
2404 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2405 p->print(this);
2406 }
2407 }
2408
2409 void nmethod::print_recorded_oops() {
2410 tty->print_cr("Recorded oops:");
2411 for (int i = 0; i < oops_count(); i++) {
2412 oop o = oop_at(i);
2413 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(o));
2414 if (o == (oop)Universe::non_oop_word()) {
2415 tty->print("non-oop word");
2416 } else {
2417 o->print_value();
2418 }
2419 tty->cr();
2420 }
2421 }
2422
2423 void nmethod::print_recorded_metadata() {
2424 tty->print_cr("Recorded metadata:");
2425 for (int i = 0; i < metadata_count(); i++) {
2426 Metadata* m = metadata_at(i);
2427 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(m));
2428 if (m == (Metadata*)Universe::non_oop_word()) {
2429 tty->print("non-metadata word");
2430 } else {
2431 m->print_value_on_maybe_null(tty);
2432 }
2433 tty->cr();
2434 }
2435 }
2436
2437 #endif // PRODUCT
2438
2439 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
2440 RelocIterator iter(this, begin, end);
2441 bool have_one = false;
2442 while (iter.next()) {
2443 have_one = true;
2444 switch (iter.type()) {
2445 case relocInfo::none: return "no_reloc";
2446 case relocInfo::oop_type: {
2447 stringStream st;
2448 oop_Relocation* r = iter.oop_reloc();
2449 oop obj = r->oop_value();
2450 st.print("oop(");
2451 if (obj == NULL) st.print("NULL");
2452 else obj->print_value_on(&st);
2453 st.print(")");
2454 return st.as_string();
2455 }
2456 case relocInfo::metadata_type: {
2457 stringStream st;
2458 metadata_Relocation* r = iter.metadata_reloc();
2459 Metadata* obj = r->metadata_value();
2460 st.print("metadata(");
2461 if (obj == NULL) st.print("NULL");
2462 else obj->print_value_on(&st);
2463 st.print(")");
2464 return st.as_string();
2465 }
2466 case relocInfo::runtime_call_type: {
2467 stringStream st;
2468 st.print("runtime_call");
2469 runtime_call_Relocation* r = iter.runtime_call_reloc();
2470 address dest = r->destination();
2471 CodeBlob* cb = CodeCache::find_blob(dest);
2472 if (cb != NULL) {
2473 st.print(" %s", cb->name());
2474 } else {
2475 ResourceMark rm;
2476 const int buflen = 1024;
2477 char* buf = NEW_RESOURCE_ARRAY(char, buflen);
2478 int offset;
2479 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) {
2480 st.print(" %s", buf);
2481 if (offset != 0) {
2482 st.print("+%d", offset);
2483 }
2484 }
2485 }
2486 return st.as_string();
2487 }
2488 case relocInfo::virtual_call_type: {
2489 stringStream st;
2490 st.print_raw("virtual_call");
2491 virtual_call_Relocation* r = iter.virtual_call_reloc();
2492 Method* m = r->method_value();
2493 if (m != NULL) {
2494 assert(m->is_method(), "");
2495 m->print_short_name(&st);
2496 }
2497 return st.as_string();
2498 }
2499 case relocInfo::opt_virtual_call_type: {
2500 stringStream st;
2501 st.print_raw("optimized virtual_call");
2502 opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc();
2503 Method* m = r->method_value();
2504 if (m != NULL) {
2505 assert(m->is_method(), "");
2506 m->print_short_name(&st);
2507 }
2508 return st.as_string();
2509 }
2510 case relocInfo::static_call_type: {
2511 stringStream st;
2512 st.print_raw("static_call");
2513 static_call_Relocation* r = iter.static_call_reloc();
2514 Method* m = r->method_value();
2515 if (m != NULL) {
2516 assert(m->is_method(), "");
2517 m->print_short_name(&st);
2518 }
2519 return st.as_string();
2520 }
2521 case relocInfo::static_stub_type: return "static_stub";
2522 case relocInfo::external_word_type: return "external_word";
2523 case relocInfo::internal_word_type: return "internal_word";
2524 case relocInfo::section_word_type: return "section_word";
2525 case relocInfo::poll_type: return "poll";
2526 case relocInfo::poll_return_type: return "poll_return";
2527 case relocInfo::type_mask: return "type_bit_mask";
2528 }
2529 }
2530 return have_one ? "other" : NULL;
2531 }
2532
2533 // Return a the last scope in (begin..end]
2534 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
2535 PcDesc* p = pc_desc_near(begin+1);
2536 if (p != NULL && p->real_pc(this) <= end) {
2537 return new ScopeDesc(this, p->scope_decode_offset(),
2538 p->obj_decode_offset(), p->should_reexecute(), p->rethrow_exception(),
2539 p->return_oop());
2540 }
2541 return NULL;
2542 }
2543
2544 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const {
2545 if (block_begin == entry_point()) stream->print_cr("[Entry Point]");
2546 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]");
2547 if (JVMCI_ONLY(_exception_offset >= 0 &&) block_begin == exception_begin()) stream->print_cr("[Exception Handler]");
2548 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]");
2549 if (JVMCI_ONLY(_deopt_handler_begin != NULL &&) block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]");
2550
2551 if (has_method_handle_invokes())
2552 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]");
2553
2554 if (block_begin == consts_begin()) stream->print_cr("[Constants]");
2555
2556 if (block_begin == entry_point()) {
2557 methodHandle m = method();
2558 if (m.not_null()) {
2559 stream->print(" # ");
2560 m->print_value_on(stream);
2561 stream->cr();
2562 }
2563 if (m.not_null() && !is_osr_method()) {
2564 ResourceMark rm;
2565 int sizeargs = m->size_of_parameters();
2566 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
2567 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
2568 {
2569 int sig_index = 0;
2570 if (!m->is_static())
2571 sig_bt[sig_index++] = T_OBJECT; // 'this'
2572 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) {
2573 BasicType t = ss.type();
2574 sig_bt[sig_index++] = t;
2575 if (type2size[t] == 2) {
2576 sig_bt[sig_index++] = T_VOID;
2577 } else {
2578 assert(type2size[t] == 1, "size is 1 or 2");
2579 }
2580 }
2581 assert(sig_index == sizeargs, "");
2582 }
2583 const char* spname = "sp"; // make arch-specific?
2584 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false);
2585 int stack_slot_offset = this->frame_size() * wordSize;
2586 int tab1 = 14, tab2 = 24;
2587 int sig_index = 0;
2588 int arg_index = (m->is_static() ? 0 : -1);
2589 bool did_old_sp = false;
2590 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) {
2591 bool at_this = (arg_index == -1);
2592 bool at_old_sp = false;
2593 BasicType t = (at_this ? T_OBJECT : ss.type());
2594 assert(t == sig_bt[sig_index], "sigs in sync");
2595 if (at_this)
2596 stream->print(" # this: ");
2597 else
2598 stream->print(" # parm%d: ", arg_index);
2599 stream->move_to(tab1);
2600 VMReg fst = regs[sig_index].first();
2601 VMReg snd = regs[sig_index].second();
2602 if (fst->is_reg()) {
2603 stream->print("%s", fst->name());
2604 if (snd->is_valid()) {
2605 stream->print(":%s", snd->name());
2606 }
2607 } else if (fst->is_stack()) {
2608 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
2609 if (offset == stack_slot_offset) at_old_sp = true;
2610 stream->print("[%s+0x%x]", spname, offset);
2611 } else {
2612 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
2613 }
2614 stream->print(" ");
2615 stream->move_to(tab2);
2616 stream->print("= ");
2617 if (at_this) {
2618 m->method_holder()->print_value_on(stream);
2619 } else {
2620 bool did_name = false;
2621 if (!at_this && ss.is_object()) {
2622 Symbol* name = ss.as_symbol_or_null();
2623 if (name != NULL) {
2624 name->print_value_on(stream);
2625 did_name = true;
2626 }
2627 }
2628 if (!did_name)
2629 stream->print("%s", type2name(t));
2630 }
2631 if (at_old_sp) {
2632 stream->print(" (%s of caller)", spname);
2633 did_old_sp = true;
2634 }
2635 stream->cr();
2636 sig_index += type2size[t];
2637 arg_index += 1;
2638 if (!at_this) ss.next();
2639 }
2640 if (!did_old_sp) {
2641 stream->print(" # ");
2642 stream->move_to(tab1);
2643 stream->print("[%s+0x%x]", spname, stack_slot_offset);
2644 stream->print(" (%s of caller)", spname);
2645 stream->cr();
2646 }
2647 }
2648 }
2649 }
2650
2651 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) {
2652 // First, find an oopmap in (begin, end].
2653 // We use the odd half-closed interval so that oop maps and scope descs
2654 // which are tied to the byte after a call are printed with the call itself.
2655 address base = code_begin();
2656 ImmutableOopMapSet* oms = oop_maps();
2657 if (oms != NULL) {
2658 for (int i = 0, imax = oms->count(); i < imax; i++) {
2659 const ImmutableOopMapPair* pair = oms->pair_at(i);
2660 const ImmutableOopMap* om = pair->get_from(oms);
2661 address pc = base + pair->pc_offset();
2662 if (pc > begin) {
2663 if (pc <= end) {
2664 st->move_to(column);
2665 st->print("; ");
2666 om->print_on(st);
2667 }
2668 break;
2669 }
2670 }
2671 }
2672
2673 // Print any debug info present at this pc.
2674 ScopeDesc* sd = scope_desc_in(begin, end);
2675 if (sd != NULL) {
2676 st->move_to(column);
2677 if (sd->bci() == SynchronizationEntryBCI) {
2678 st->print(";*synchronization entry");
2679 } else {
2680 if (sd->method() == NULL) {
2681 st->print("method is NULL");
2682 } else if (sd->method()->is_native()) {
2683 st->print("method is native");
2684 } else {
2685 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci());
2686 st->print(";*%s", Bytecodes::name(bc));
2687 switch (bc) {
2688 case Bytecodes::_invokevirtual:
2689 case Bytecodes::_invokespecial:
2690 case Bytecodes::_invokestatic:
2691 case Bytecodes::_invokeinterface:
2692 {
2693 Bytecode_invoke invoke(sd->method(), sd->bci());
2694 st->print(" ");
2695 if (invoke.name() != NULL)
2696 invoke.name()->print_symbol_on(st);
2697 else
2698 st->print("<UNKNOWN>");
2699 break;
2700 }
2701 case Bytecodes::_getfield:
2702 case Bytecodes::_putfield:
2703 case Bytecodes::_getstatic:
2704 case Bytecodes::_putstatic:
2705 {
2706 Bytecode_field field(sd->method(), sd->bci());
2707 st->print(" ");
2708 if (field.name() != NULL)
2709 field.name()->print_symbol_on(st);
2710 else
2711 st->print("<UNKNOWN>");
2712 }
2713 }
2714 }
2715 st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop());
2716 }
2717
2718 // Print all scopes
2719 for (;sd != NULL; sd = sd->sender()) {
2720 st->move_to(column);
2721 st->print("; -");
2722 if (sd->method() == NULL) {
2723 st->print("method is NULL");
2724 } else {
2725 sd->method()->print_short_name(st);
2726 }
2727 int lineno = sd->method()->line_number_from_bci(sd->bci());
2728 if (lineno != -1) {
2729 st->print("@%d (line %d)", sd->bci(), lineno);
2730 } else {
2731 st->print("@%d", sd->bci());
2732 }
2733 st->cr();
2734 }
2735 }
2736
2737 // Print relocation information
2738 const char* str = reloc_string_for(begin, end);
2739 if (str != NULL) {
2740 if (sd != NULL) st->cr();
2741 st->move_to(column);
2742 st->print("; {%s}", str);
2743 }
2744 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin());
2745 if (cont_offset != 0) {
2746 st->move_to(column);
2747 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset));
2748 }
2749
2750 }
2751
2752 #ifndef PRODUCT
2753
2754 void nmethod::print_value_on(outputStream* st) const {
2755 st->print("nmethod");
2756 print_on(st, NULL);
2757 }
2758
2759 void nmethod::print_calls(outputStream* st) {
2760 RelocIterator iter(this);
2761 while (iter.next()) {
2762 switch (iter.type()) {
2763 case relocInfo::virtual_call_type:
2764 case relocInfo::opt_virtual_call_type: {
2765 VerifyMutexLocker mc(CompiledIC_lock);
2766 CompiledIC_at(&iter)->print();
2767 break;
2768 }
2769 case relocInfo::static_call_type:
2770 st->print_cr("Static call at " INTPTR_FORMAT, p2i(iter.reloc()->addr()));
2771 compiledStaticCall_at(iter.reloc())->print();
2772 break;
2773 }
2774 }
2775 }
2776
2777 void nmethod::print_handler_table() {
2778 ExceptionHandlerTable(this).print();
2779 }
2780
2781 void nmethod::print_nul_chk_table() {
2782 ImplicitExceptionTable(this).print(code_begin());
2783 }
2784
2785 void nmethod::print_statistics() {
2786 ttyLocker ttyl;
2787 if (xtty != NULL) xtty->head("statistics type='nmethod'");
2788 native_nmethod_stats.print_native_nmethod_stats();
2789 #ifdef COMPILER1
2790 c1_java_nmethod_stats.print_nmethod_stats("C1");
2791 #endif
2792 #ifdef COMPILER2
2793 c2_java_nmethod_stats.print_nmethod_stats("C2");
2794 #endif
2795 #if INCLUDE_JVMCI
2796 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI");
2797 #endif
2798 #ifdef SHARK
2799 shark_java_nmethod_stats.print_nmethod_stats("Shark");
2800 #endif
2801 unknown_java_nmethod_stats.print_nmethod_stats("Unknown");
2802 DebugInformationRecorder::print_statistics();
2803 #ifndef PRODUCT
2804 pc_nmethod_stats.print_pc_stats();
2805 #endif
2806 Dependencies::print_statistics();
2807 if (xtty != NULL) xtty->tail("statistics");
2808 }
2809
2810 #endif // !PRODUCT
2811
2812 #if INCLUDE_JVMCI
2813 void nmethod::clear_jvmci_installed_code() {
2814 // write_ref_method_pre/post can only be safely called at a
2815 // safepoint or while holding the CodeCache_lock
2816 assert(CodeCache_lock->is_locked() ||
2817 SafepointSynchronize::is_at_safepoint(), "should be performed under a lock for consistency");
2818 if (_jvmci_installed_code != NULL) {
2819 // This must be done carefully to maintain nmethod remembered sets properly
2820 BarrierSet* bs = GC::gc()->heap()->barrier_set();
2821 bs->write_ref_nmethod_pre(&_jvmci_installed_code, this);
2822 _jvmci_installed_code = NULL;
2823 bs->write_ref_nmethod_post(&_jvmci_installed_code, this);
2824 }
2825 }
2826
2827 void nmethod::maybe_invalidate_installed_code() {
2828 assert(Patching_lock->is_locked() ||
2829 SafepointSynchronize::is_at_safepoint(), "should be performed under a lock for consistency");
2830 oop installed_code = jvmci_installed_code();
2831 if (installed_code != NULL) {
2832 nmethod* nm = (nmethod*)InstalledCode::address(installed_code);
2833 if (nm == NULL || nm != this) {
2834 // The link has been broken or the InstalledCode instance is
2835 // associated with another nmethod so do nothing.
2836 return;
2837 }
2838 if (!is_alive()) {
2839 // Break the link between nmethod and InstalledCode such that the nmethod
2840 // can subsequently be flushed safely. The link must be maintained while
2841 // the method could have live activations since invalidateInstalledCode
2842 // might want to invalidate all existing activations.
2843 InstalledCode::set_address(installed_code, 0);
2844 InstalledCode::set_entryPoint(installed_code, 0);
2845 } else if (is_not_entrant()) {
2846 // Remove the entry point so any invocation will fail but keep
2847 // the address link around that so that existing activations can
2848 // be invalidated.
2849 InstalledCode::set_entryPoint(installed_code, 0);
2850 }
2851 }
2852 }
2853
2854 void nmethod::invalidate_installed_code(Handle installedCode, TRAPS) {
2855 if (installedCode() == NULL) {
2856 THROW(vmSymbols::java_lang_NullPointerException());
2857 }
2858 jlong nativeMethod = InstalledCode::address(installedCode);
2859 nmethod* nm = (nmethod*)nativeMethod;
2860 if (nm == NULL) {
2861 // Nothing to do
2862 return;
2863 }
2864
2865 nmethodLocker nml(nm);
2866 #ifdef ASSERT
2867 {
2868 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
2869 // This relationship can only be checked safely under a lock
2870 assert(nm == NULL || !nm->is_alive() || nm->jvmci_installed_code() == installedCode(), "sanity check");
2871 }
2872 #endif
2873
2874 if (nm->is_alive()) {
2875 // The nmethod state machinery maintains the link between the
2876 // HotSpotInstalledCode and nmethod* so as long as the nmethod appears to be
2877 // alive assume there is work to do and deoptimize the nmethod.
2878 nm->mark_for_deoptimization();
2879 VM_Deoptimize op;
2880 VMThread::execute(&op);
2881 }
2882
2883 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
2884 // Check that it's still associated with the same nmethod and break
2885 // the link if it is.
2886 if (InstalledCode::address(installedCode) == nativeMethod) {
2887 InstalledCode::set_address(installedCode, 0);
2888 }
2889 }
2890
2891 char* nmethod::jvmci_installed_code_name(char* buf, size_t buflen) {
2892 if (!this->is_compiled_by_jvmci()) {
2893 return NULL;
2894 }
2895 oop installedCode = this->jvmci_installed_code();
2896 if (installedCode != NULL) {
2897 oop installedCodeName = NULL;
2898 if (installedCode->is_a(InstalledCode::klass())) {
2899 installedCodeName = InstalledCode::name(installedCode);
2900 }
2901 if (installedCodeName != NULL) {
2902 return java_lang_String::as_utf8_string(installedCodeName, buf, (int)buflen);
2903 } else {
2904 jio_snprintf(buf, buflen, "null");
2905 return buf;
2906 }
2907 }
2908 jio_snprintf(buf, buflen, "noInstalledCode");
2909 return buf;
2910 }
2911 #endif
2912