1 /*
2 * Copyright (c) 1997, 2019, 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 "jvm.h"
27 #include "code/codeCache.hpp"
28 #include "code/compiledIC.hpp"
29 #include "code/compiledMethod.inline.hpp"
30 #include "code/dependencies.hpp"
31 #include "code/nativeInst.hpp"
32 #include "code/nmethod.hpp"
33 #include "code/scopeDesc.hpp"
34 #include "compiler/abstractCompiler.hpp"
35 #include "compiler/compileBroker.hpp"
36 #include "compiler/compileLog.hpp"
37 #include "compiler/compilerDirectives.hpp"
38 #include "compiler/directivesParser.hpp"
39 #include "compiler/disassembler.hpp"
40 #include "interpreter/bytecode.hpp"
41 #include "logging/log.hpp"
42 #include "logging/logStream.hpp"
43 #include "memory/allocation.inline.hpp"
44 #include "memory/resourceArea.hpp"
45 #include "oops/access.inline.hpp"
46 #include "oops/method.inline.hpp"
47 #include "oops/methodData.hpp"
48 #include "oops/oop.inline.hpp"
49 #include "prims/jvmtiImpl.hpp"
50 #include "runtime/atomic.hpp"
51 #include "runtime/flags/flagSetting.hpp"
52 #include "runtime/frame.inline.hpp"
53 #include "runtime/handles.inline.hpp"
54 #include "runtime/jniHandles.inline.hpp"
55 #include "runtime/orderAccess.hpp"
56 #include "runtime/os.hpp"
57 #include "runtime/safepointVerifiers.hpp"
58 #include "runtime/sharedRuntime.hpp"
59 #include "runtime/sweeper.hpp"
60 #include "runtime/vmThread.hpp"
61 #include "utilities/align.hpp"
62 #include "utilities/dtrace.hpp"
63 #include "utilities/events.hpp"
64 #include "utilities/resourceHash.hpp"
65 #include "utilities/xmlstream.hpp"
66 #if INCLUDE_JVMCI
67 #include "jvmci/jvmciJavaClasses.hpp"
68 #endif
69
70 #ifdef DTRACE_ENABLED
71
72 // Only bother with this argument setup if dtrace is available
73
74 #define DTRACE_METHOD_UNLOAD_PROBE(method) \
75 { \
76 Method* m = (method); \
77 if (m != NULL) { \
78 Symbol* klass_name = m->klass_name(); \
79 Symbol* name = m->name(); \
80 Symbol* signature = m->signature(); \
81 HOTSPOT_COMPILED_METHOD_UNLOAD( \
82 (char *) klass_name->bytes(), klass_name->utf8_length(), \
83 (char *) name->bytes(), name->utf8_length(), \
84 (char *) signature->bytes(), signature->utf8_length()); \
85 } \
86 }
87
88 #else // ndef DTRACE_ENABLED
89
90 #define DTRACE_METHOD_UNLOAD_PROBE(method)
91
92 #endif
93
94 //---------------------------------------------------------------------------------
95 // NMethod statistics
96 // They are printed under various flags, including:
97 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation.
98 // (In the latter two cases, they like other stats are printed to the log only.)
99
100 #ifndef PRODUCT
101 // These variables are put into one block to reduce relocations
102 // and make it simpler to print from the debugger.
103 struct java_nmethod_stats_struct {
104 int nmethod_count;
105 int total_size;
106 int relocation_size;
107 int consts_size;
108 int insts_size;
109 int stub_size;
110 int scopes_data_size;
111 int scopes_pcs_size;
112 int dependencies_size;
113 int handler_table_size;
114 int nul_chk_table_size;
115 int oops_size;
116 int metadata_size;
117
118 void note_nmethod(nmethod* nm) {
119 nmethod_count += 1;
120 total_size += nm->size();
121 relocation_size += nm->relocation_size();
122 consts_size += nm->consts_size();
123 insts_size += nm->insts_size();
124 stub_size += nm->stub_size();
125 oops_size += nm->oops_size();
126 metadata_size += nm->metadata_size();
127 scopes_data_size += nm->scopes_data_size();
128 scopes_pcs_size += nm->scopes_pcs_size();
129 dependencies_size += nm->dependencies_size();
130 handler_table_size += nm->handler_table_size();
131 nul_chk_table_size += nm->nul_chk_table_size();
132 }
133 void print_nmethod_stats(const char* name) {
134 if (nmethod_count == 0) return;
135 tty->print_cr("Statistics for %d bytecoded nmethods for %s:", nmethod_count, name);
136 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size);
137 if (nmethod_count != 0) tty->print_cr(" header = " SIZE_FORMAT, nmethod_count * sizeof(nmethod));
138 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size);
139 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size);
140 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size);
141 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size);
142 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size);
143 if (metadata_size != 0) tty->print_cr(" metadata = %d", metadata_size);
144 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size);
145 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size);
146 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size);
147 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size);
148 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size);
149 }
150 };
151
152 struct native_nmethod_stats_struct {
153 int native_nmethod_count;
154 int native_total_size;
155 int native_relocation_size;
156 int native_insts_size;
157 int native_oops_size;
158 int native_metadata_size;
159 void note_native_nmethod(nmethod* nm) {
160 native_nmethod_count += 1;
161 native_total_size += nm->size();
162 native_relocation_size += nm->relocation_size();
163 native_insts_size += nm->insts_size();
164 native_oops_size += nm->oops_size();
165 native_metadata_size += nm->metadata_size();
166 }
167 void print_native_nmethod_stats() {
168 if (native_nmethod_count == 0) return;
169 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count);
170 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size);
171 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size);
172 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size);
173 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size);
174 if (native_metadata_size != 0) tty->print_cr(" N. metadata = %d", native_metadata_size);
175 }
176 };
177
178 struct pc_nmethod_stats_struct {
179 int pc_desc_resets; // number of resets (= number of caches)
180 int pc_desc_queries; // queries to nmethod::find_pc_desc
181 int pc_desc_approx; // number of those which have approximate true
182 int pc_desc_repeats; // number of _pc_descs[0] hits
183 int pc_desc_hits; // number of LRU cache hits
184 int pc_desc_tests; // total number of PcDesc examinations
185 int pc_desc_searches; // total number of quasi-binary search steps
186 int pc_desc_adds; // number of LUR cache insertions
187
188 void print_pc_stats() {
189 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query",
190 pc_desc_queries,
191 (double)(pc_desc_tests + pc_desc_searches)
192 / pc_desc_queries);
193 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d",
194 pc_desc_resets,
195 pc_desc_queries, pc_desc_approx,
196 pc_desc_repeats, pc_desc_hits,
197 pc_desc_tests, pc_desc_searches, pc_desc_adds);
198 }
199 };
200
201 #ifdef COMPILER1
202 static java_nmethod_stats_struct c1_java_nmethod_stats;
203 #endif
204 #ifdef COMPILER2
205 static java_nmethod_stats_struct c2_java_nmethod_stats;
206 #endif
207 #if INCLUDE_JVMCI
208 static java_nmethod_stats_struct jvmci_java_nmethod_stats;
209 #endif
210 static java_nmethod_stats_struct unknown_java_nmethod_stats;
211
212 static native_nmethod_stats_struct native_nmethod_stats;
213 static pc_nmethod_stats_struct pc_nmethod_stats;
214
215 static void note_java_nmethod(nmethod* nm) {
216 #ifdef COMPILER1
217 if (nm->is_compiled_by_c1()) {
218 c1_java_nmethod_stats.note_nmethod(nm);
219 } else
220 #endif
221 #ifdef COMPILER2
222 if (nm->is_compiled_by_c2()) {
223 c2_java_nmethod_stats.note_nmethod(nm);
224 } else
225 #endif
226 #if INCLUDE_JVMCI
227 if (nm->is_compiled_by_jvmci()) {
228 jvmci_java_nmethod_stats.note_nmethod(nm);
229 } else
230 #endif
231 {
232 unknown_java_nmethod_stats.note_nmethod(nm);
233 }
234 }
235 #endif // !PRODUCT
236
237 //---------------------------------------------------------------------------------
238
239
240 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) {
241 assert(pc != NULL, "Must be non null");
242 assert(exception.not_null(), "Must be non null");
243 assert(handler != NULL, "Must be non null");
244
245 _count = 0;
246 _exception_type = exception->klass();
247 _next = NULL;
248 _purge_list_next = NULL;
249
250 add_address_and_handler(pc,handler);
251 }
252
253
254 address ExceptionCache::match(Handle exception, address pc) {
255 assert(pc != NULL,"Must be non null");
256 assert(exception.not_null(),"Must be non null");
257 if (exception->klass() == exception_type()) {
258 return (test_address(pc));
259 }
260
261 return NULL;
262 }
263
264
265 bool ExceptionCache::match_exception_with_space(Handle exception) {
266 assert(exception.not_null(),"Must be non null");
267 if (exception->klass() == exception_type() && count() < cache_size) {
268 return true;
269 }
270 return false;
271 }
272
273
274 address ExceptionCache::test_address(address addr) {
275 int limit = count();
276 for (int i = 0; i < limit; i++) {
277 if (pc_at(i) == addr) {
278 return handler_at(i);
279 }
280 }
281 return NULL;
282 }
283
284
285 bool ExceptionCache::add_address_and_handler(address addr, address handler) {
286 if (test_address(addr) == handler) return true;
287
288 int index = count();
289 if (index < cache_size) {
290 set_pc_at(index, addr);
291 set_handler_at(index, handler);
292 increment_count();
293 return true;
294 }
295 return false;
296 }
297
298 ExceptionCache* ExceptionCache::next() {
299 return Atomic::load(&_next);
300 }
301
302 void ExceptionCache::set_next(ExceptionCache *ec) {
303 Atomic::store(ec, &_next);
304 }
305
306 //-----------------------------------------------------------------------------
307
308
309 // Helper used by both find_pc_desc methods.
310 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) {
311 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_tests);
312 if (!approximate)
313 return pc->pc_offset() == pc_offset;
314 else
315 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset();
316 }
317
318 void PcDescCache::reset_to(PcDesc* initial_pc_desc) {
319 if (initial_pc_desc == NULL) {
320 _pc_descs[0] = NULL; // native method; no PcDescs at all
321 return;
322 }
323 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_resets);
324 // reset the cache by filling it with benign (non-null) values
325 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel");
326 for (int i = 0; i < cache_size; i++)
327 _pc_descs[i] = initial_pc_desc;
328 }
329
330 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) {
331 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_queries);
332 NOT_PRODUCT(if (approximate) ++pc_nmethod_stats.pc_desc_approx);
333
334 // Note: one might think that caching the most recently
335 // read value separately would be a win, but one would be
336 // wrong. When many threads are updating it, the cache
337 // line it's in would bounce between caches, negating
338 // any benefit.
339
340 // In order to prevent race conditions do not load cache elements
341 // repeatedly, but use a local copy:
342 PcDesc* res;
343
344 // Step one: Check the most recently added value.
345 res = _pc_descs[0];
346 if (res == NULL) return NULL; // native method; no PcDescs at all
347 if (match_desc(res, pc_offset, approximate)) {
348 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_repeats);
349 return res;
350 }
351
352 // Step two: Check the rest of the LRU cache.
353 for (int i = 1; i < cache_size; ++i) {
354 res = _pc_descs[i];
355 if (res->pc_offset() < 0) break; // optimization: skip empty cache
356 if (match_desc(res, pc_offset, approximate)) {
357 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_hits);
358 return res;
359 }
360 }
361
362 // Report failure.
363 return NULL;
364 }
365
366 void PcDescCache::add_pc_desc(PcDesc* pc_desc) {
367 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_adds);
368 // Update the LRU cache by shifting pc_desc forward.
369 for (int i = 0; i < cache_size; i++) {
370 PcDesc* next = _pc_descs[i];
371 _pc_descs[i] = pc_desc;
372 pc_desc = next;
373 }
374 }
375
376 // adjust pcs_size so that it is a multiple of both oopSize and
377 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple
378 // of oopSize, then 2*sizeof(PcDesc) is)
379 static int adjust_pcs_size(int pcs_size) {
380 int nsize = align_up(pcs_size, oopSize);
381 if ((nsize % sizeof(PcDesc)) != 0) {
382 nsize = pcs_size + sizeof(PcDesc);
383 }
384 assert((nsize % oopSize) == 0, "correct alignment");
385 return nsize;
386 }
387
388
389 int nmethod::total_size() const {
390 return
391 consts_size() +
392 insts_size() +
393 stub_size() +
394 scopes_data_size() +
395 scopes_pcs_size() +
396 handler_table_size() +
397 nul_chk_table_size();
398 }
399
400 address* nmethod::orig_pc_addr(const frame* fr) {
401 return (address*) ((address)fr->unextended_sp() + _orig_pc_offset);
402 }
403
404 const char* nmethod::compile_kind() const {
405 if (is_osr_method()) return "osr";
406 if (method() != NULL && is_native_method()) return "c2n";
407 return NULL;
408 }
409
410 // Fill in default values for various flag fields
411 void nmethod::init_defaults() {
412 _state = not_installed;
413 _has_flushed_dependencies = 0;
414 _lock_count = 0;
415 _stack_traversal_mark = 0;
416 _unload_reported = false; // jvmti state
417 _is_far_code = false; // nmethods are located in CodeCache
418
419 #ifdef ASSERT
420 _oops_are_stale = false;
421 #endif
422
423 _oops_do_mark_link = NULL;
424 _jmethod_id = NULL;
425 _osr_link = NULL;
426 _scavenge_root_link = NULL;
427 _scavenge_root_state = 0;
428 #if INCLUDE_RTM_OPT
429 _rtm_state = NoRTM;
430 #endif
431 #if INCLUDE_JVMCI
432 _jvmci_installed_code = NULL;
433 _speculation_log = NULL;
434 _jvmci_installed_code_triggers_invalidation = false;
435 #endif
436 }
437
438 nmethod* nmethod::new_native_nmethod(const methodHandle& method,
439 int compile_id,
440 CodeBuffer *code_buffer,
441 int vep_offset,
442 int frame_complete,
443 int frame_size,
444 ByteSize basic_lock_owner_sp_offset,
445 ByteSize basic_lock_sp_offset,
446 OopMapSet* oop_maps) {
447 code_buffer->finalize_oop_references(method);
448 // create nmethod
449 nmethod* nm = NULL;
450 {
451 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
452 int native_nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod));
453 CodeOffsets offsets;
454 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
455 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
456 nm = new (native_nmethod_size, CompLevel_none) nmethod(method(), compiler_none, native_nmethod_size,
457 compile_id, &offsets,
458 code_buffer, frame_size,
459 basic_lock_owner_sp_offset,
460 basic_lock_sp_offset, oop_maps);
461 NOT_PRODUCT(if (nm != NULL) native_nmethod_stats.note_native_nmethod(nm));
462 }
463
464 if (nm != NULL) {
465 // verify nmethod
466 debug_only(nm->verify();) // might block
467
468 nm->log_new_nmethod();
469 nm->make_in_use();
470 }
471 return nm;
472 }
473
474 nmethod* nmethod::new_nmethod(const methodHandle& method,
475 int compile_id,
476 int entry_bci,
477 CodeOffsets* offsets,
478 int orig_pc_offset,
479 DebugInformationRecorder* debug_info,
480 Dependencies* dependencies,
481 CodeBuffer* code_buffer, int frame_size,
482 OopMapSet* oop_maps,
483 ExceptionHandlerTable* handler_table,
484 ImplicitExceptionTable* nul_chk_table,
485 AbstractCompiler* compiler,
486 int comp_level
487 #if INCLUDE_JVMCI
488 , jweak installed_code,
489 jweak speculationLog
490 #endif
491 )
492 {
493 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
494 code_buffer->finalize_oop_references(method);
495 // create nmethod
496 nmethod* nm = NULL;
497 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
498 int nmethod_size =
499 CodeBlob::allocation_size(code_buffer, sizeof(nmethod))
500 + adjust_pcs_size(debug_info->pcs_size())
501 + align_up((int)dependencies->size_in_bytes(), oopSize)
502 + align_up(handler_table->size_in_bytes() , oopSize)
503 + align_up(nul_chk_table->size_in_bytes() , oopSize)
504 + align_up(debug_info->data_size() , oopSize);
505
506 nm = new (nmethod_size, comp_level)
507 nmethod(method(), compiler->type(), nmethod_size, compile_id, entry_bci, offsets,
508 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size,
509 oop_maps,
510 handler_table,
511 nul_chk_table,
512 compiler,
513 comp_level
514 #if INCLUDE_JVMCI
515 , installed_code,
516 speculationLog
517 #endif
518 );
519
520 if (nm != NULL) {
521 // To make dependency checking during class loading fast, record
522 // the nmethod dependencies in the classes it is dependent on.
523 // This allows the dependency checking code to simply walk the
524 // class hierarchy above the loaded class, checking only nmethods
525 // which are dependent on those classes. The slow way is to
526 // check every nmethod for dependencies which makes it linear in
527 // the number of methods compiled. For applications with a lot
528 // classes the slow way is too slow.
529 for (Dependencies::DepStream deps(nm); deps.next(); ) {
530 if (deps.type() == Dependencies::call_site_target_value) {
531 // CallSite dependencies are managed on per-CallSite instance basis.
532 oop call_site = deps.argument_oop(0);
533 MethodHandles::add_dependent_nmethod(call_site, nm);
534 } else {
535 Klass* klass = deps.context_type();
536 if (klass == NULL) {
537 continue; // ignore things like evol_method
538 }
539 // record this nmethod as dependent on this klass
540 InstanceKlass::cast(klass)->add_dependent_nmethod(nm);
541 }
542 }
543 NOT_PRODUCT(if (nm != NULL) note_java_nmethod(nm));
544 }
545 }
546 // Do verification and logging outside CodeCache_lock.
547 if (nm != NULL) {
548 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
549 DEBUG_ONLY(nm->verify();)
550 nm->log_new_nmethod();
551 }
552 return nm;
553 }
554
555 // For native wrappers
556 nmethod::nmethod(
557 Method* method,
558 CompilerType type,
559 int nmethod_size,
560 int compile_id,
561 CodeOffsets* offsets,
562 CodeBuffer* code_buffer,
563 int frame_size,
564 ByteSize basic_lock_owner_sp_offset,
565 ByteSize basic_lock_sp_offset,
566 OopMapSet* oop_maps )
567 : CompiledMethod(method, "native nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false),
568 _is_unloading_state(0),
569 _native_receiver_sp_offset(basic_lock_owner_sp_offset),
570 _native_basic_lock_sp_offset(basic_lock_sp_offset)
571 {
572 {
573 int scopes_data_offset = 0;
574 int deoptimize_offset = 0;
575 int deoptimize_mh_offset = 0;
576
577 debug_only(NoSafepointVerifier nsv;)
578 assert_locked_or_safepoint(CodeCache_lock);
579
580 init_defaults();
581 _entry_bci = InvocationEntryBci;
582 // We have no exception handler or deopt handler make the
583 // values something that will never match a pc like the nmethod vtable entry
584 _exception_offset = 0;
585 _orig_pc_offset = 0;
586
587 _consts_offset = data_offset();
588 _stub_offset = data_offset();
589 _oops_offset = data_offset();
590 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize);
591 scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize);
592 _scopes_pcs_offset = scopes_data_offset;
593 _dependencies_offset = _scopes_pcs_offset;
594 _handler_table_offset = _dependencies_offset;
595 _nul_chk_table_offset = _handler_table_offset;
596 _nmethod_end_offset = _nul_chk_table_offset;
597 _compile_id = compile_id;
598 _comp_level = CompLevel_none;
599 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
600 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
601 _verified_value_entry_point = _verified_entry_point;
602 _verified_value_ro_entry_point = _verified_entry_point;
603 _osr_entry_point = NULL;
604 _exception_cache = NULL;
605 _pc_desc_container.reset_to(NULL);
606 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
607
608 _scopes_data_begin = (address) this + scopes_data_offset;
609 _deopt_handler_begin = (address) this + deoptimize_offset;
610 _deopt_mh_handler_begin = (address) this + deoptimize_mh_offset;
611
612 code_buffer->copy_code_and_locs_to(this);
613 code_buffer->copy_values_to(this);
614
615 clear_unloading_state();
616 if (ScavengeRootsInCode) {
617 Universe::heap()->register_nmethod(this);
618 }
619 debug_only(Universe::heap()->verify_nmethod(this));
620 CodeCache::commit(this);
621 }
622
623 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
624 ttyLocker ttyl; // keep the following output all in one block
625 // This output goes directly to the tty, not the compiler log.
626 // To enable tools to match it up with the compilation activity,
627 // be sure to tag this tty output with the compile ID.
628 if (xtty != NULL) {
629 xtty->begin_head("print_native_nmethod");
630 xtty->method(_method);
631 xtty->stamp();
632 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
633 }
634 // print the header part first
635 print();
636 // then print the requested information
637 if (PrintNativeNMethods) {
638 print_code();
639 if (oop_maps != NULL) {
640 oop_maps->print();
641 }
642 }
643 if (PrintRelocations) {
644 print_relocations();
645 }
646 if (xtty != NULL) {
647 xtty->tail("print_native_nmethod");
648 }
649 }
650 }
651
652 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () {
653 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level));
654 }
655
656 nmethod::nmethod(
657 Method* method,
658 CompilerType type,
659 int nmethod_size,
660 int compile_id,
661 int entry_bci,
662 CodeOffsets* offsets,
663 int orig_pc_offset,
664 DebugInformationRecorder* debug_info,
665 Dependencies* dependencies,
666 CodeBuffer *code_buffer,
667 int frame_size,
668 OopMapSet* oop_maps,
669 ExceptionHandlerTable* handler_table,
670 ImplicitExceptionTable* nul_chk_table,
671 AbstractCompiler* compiler,
672 int comp_level
673 #if INCLUDE_JVMCI
674 , jweak installed_code,
675 jweak speculation_log
676 #endif
677 )
678 : CompiledMethod(method, "nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false),
679 _is_unloading_state(0),
680 _native_receiver_sp_offset(in_ByteSize(-1)),
681 _native_basic_lock_sp_offset(in_ByteSize(-1))
682 {
683 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
684 {
685 debug_only(NoSafepointVerifier nsv;)
686 assert_locked_or_safepoint(CodeCache_lock);
687
688 _deopt_handler_begin = (address) this;
689 _deopt_mh_handler_begin = (address) this;
690
691 init_defaults();
692 _entry_bci = entry_bci;
693 _compile_id = compile_id;
694 _comp_level = comp_level;
695 _orig_pc_offset = orig_pc_offset;
696 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
697
698 // Section offsets
699 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts());
700 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs());
701 set_ctable_begin(header_begin() + _consts_offset);
702
703 #if INCLUDE_JVMCI
704 _jvmci_installed_code = installed_code;
705 _speculation_log = speculation_log;
706 oop obj = JNIHandles::resolve(installed_code);
707 if (obj == NULL || (obj->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(obj))) {
708 _jvmci_installed_code_triggers_invalidation = false;
709 } else {
710 _jvmci_installed_code_triggers_invalidation = true;
711 }
712
713 if (compiler->is_jvmci()) {
714 // JVMCI might not produce any stub sections
715 if (offsets->value(CodeOffsets::Exceptions) != -1) {
716 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions);
717 } else {
718 _exception_offset = -1;
719 }
720 if (offsets->value(CodeOffsets::Deopt) != -1) {
721 _deopt_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::Deopt);
722 } else {
723 _deopt_handler_begin = NULL;
724 }
725 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
726 _deopt_mh_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::DeoptMH);
727 } else {
728 _deopt_mh_handler_begin = NULL;
729 }
730 } else {
731 #endif
732 // Exception handler and deopt handler are in the stub section
733 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set");
734 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set");
735
736 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
737 _deopt_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::Deopt);
738 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
739 _deopt_mh_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::DeoptMH);
740 } else {
741 _deopt_mh_handler_begin = NULL;
742 #if INCLUDE_JVMCI
743 }
744 #endif
745 }
746 if (offsets->value(CodeOffsets::UnwindHandler) != -1) {
747 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler);
748 } else {
749 _unwind_handler_offset = -1;
750 }
751
752 _oops_offset = data_offset();
753 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize);
754 int scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize);
755
756 _scopes_pcs_offset = scopes_data_offset + align_up(debug_info->data_size (), oopSize);
757 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
758 _handler_table_offset = _dependencies_offset + align_up((int)dependencies->size_in_bytes (), oopSize);
759 _nul_chk_table_offset = _handler_table_offset + align_up(handler_table->size_in_bytes(), oopSize);
760 _nmethod_end_offset = _nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize);
761 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
762 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
763 _verified_value_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Value_Entry);
764 _verified_value_ro_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Value_Entry_RO);
765 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry);
766 _exception_cache = NULL;
767
768 _scopes_data_begin = (address) this + scopes_data_offset;
769
770 _pc_desc_container.reset_to(scopes_pcs_begin());
771
772 code_buffer->copy_code_and_locs_to(this);
773 // Copy contents of ScopeDescRecorder to nmethod
774 code_buffer->copy_values_to(this);
775 debug_info->copy_to(this);
776 dependencies->copy_to(this);
777 clear_unloading_state();
778 if (ScavengeRootsInCode) {
779 Universe::heap()->register_nmethod(this);
780 }
781 debug_only(Universe::heap()->verify_nmethod(this));
782
783 CodeCache::commit(this);
784
785 // Copy contents of ExceptionHandlerTable to nmethod
786 handler_table->copy_to(this);
787 nul_chk_table->copy_to(this);
788
789 // we use the information of entry points to find out if a method is
790 // static or non static
791 assert(compiler->is_c2() || compiler->is_jvmci() ||
792 _method->is_static() == (entry_point() == _verified_entry_point),
793 " entry points must be same for static methods and vice versa");
794 }
795 }
796
797 // Print a short set of xml attributes to identify this nmethod. The
798 // output should be embedded in some other element.
799 void nmethod::log_identity(xmlStream* log) const {
800 log->print(" compile_id='%d'", compile_id());
801 const char* nm_kind = compile_kind();
802 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind);
803 log->print(" compiler='%s'", compiler_name());
804 if (TieredCompilation) {
805 log->print(" level='%d'", comp_level());
806 }
807 #if INCLUDE_JVMCI
808 char buffer[O_BUFLEN];
809 char* jvmci_name = jvmci_installed_code_name(buffer, O_BUFLEN);
810 if (jvmci_name != NULL) {
811 log->print(" jvmci_installed_code_name='");
812 log->text("%s", jvmci_name);
813 log->print("'");
814 }
815 #endif
816 }
817
818
819 #define LOG_OFFSET(log, name) \
820 if (p2i(name##_end()) - p2i(name##_begin())) \
821 log->print(" " XSTR(name) "_offset='" INTX_FORMAT "'" , \
822 p2i(name##_begin()) - p2i(this))
823
824
825 void nmethod::log_new_nmethod() const {
826 if (LogCompilation && xtty != NULL) {
827 ttyLocker ttyl;
828 HandleMark hm;
829 xtty->begin_elem("nmethod");
830 log_identity(xtty);
831 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size());
832 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this));
833
834 LOG_OFFSET(xtty, relocation);
835 LOG_OFFSET(xtty, consts);
836 LOG_OFFSET(xtty, insts);
837 LOG_OFFSET(xtty, stub);
838 LOG_OFFSET(xtty, scopes_data);
839 LOG_OFFSET(xtty, scopes_pcs);
840 LOG_OFFSET(xtty, dependencies);
841 LOG_OFFSET(xtty, handler_table);
842 LOG_OFFSET(xtty, nul_chk_table);
843 LOG_OFFSET(xtty, oops);
844 LOG_OFFSET(xtty, metadata);
845
846 xtty->method(method());
847 xtty->stamp();
848 xtty->end_elem();
849 }
850 }
851
852 #undef LOG_OFFSET
853
854
855 // Print out more verbose output usually for a newly created nmethod.
856 void nmethod::print_on(outputStream* st, const char* msg) const {
857 if (st != NULL) {
858 ttyLocker ttyl;
859 if (WizardMode) {
860 CompileTask::print(st, this, msg, /*short_form:*/ true);
861 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this));
862 } else {
863 CompileTask::print(st, this, msg, /*short_form:*/ false);
864 }
865 }
866 }
867
868 void nmethod::maybe_print_nmethod(DirectiveSet* directive) {
869 bool printnmethods = directive->PrintAssemblyOption || directive->PrintNMethodsOption;
870 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
871 print_nmethod(printnmethods);
872 }
873 }
874
875 void nmethod::print_nmethod(bool printmethod) {
876 ttyLocker ttyl; // keep the following output all in one block
877 if (xtty != NULL) {
878 xtty->begin_head("print_nmethod");
879 xtty->stamp();
880 xtty->end_head();
881 }
882 // print the header part first
883 print();
884 // then print the requested information
885 if (printmethod) {
886 print_code();
887 print_pcs();
888 if (oop_maps()) {
889 oop_maps()->print();
890 }
891 }
892 if (printmethod || PrintDebugInfo || CompilerOracle::has_option_string(_method, "PrintDebugInfo")) {
893 print_scopes();
894 }
895 if (printmethod || PrintRelocations || CompilerOracle::has_option_string(_method, "PrintRelocations")) {
896 print_relocations();
897 }
898 if (printmethod || PrintDependencies || CompilerOracle::has_option_string(_method, "PrintDependencies")) {
899 print_dependencies();
900 }
901 if (printmethod || PrintExceptionHandlers) {
902 print_handler_table();
903 print_nul_chk_table();
904 }
905 if (printmethod) {
906 print_recorded_oops();
907 print_recorded_metadata();
908 }
909 if (xtty != NULL) {
910 xtty->tail("print_nmethod");
911 }
912 }
913
914
915 // Promote one word from an assembly-time handle to a live embedded oop.
916 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
917 if (handle == NULL ||
918 // As a special case, IC oops are initialized to 1 or -1.
919 handle == (jobject) Universe::non_oop_word()) {
920 (*dest) = (oop) handle;
921 } else {
922 (*dest) = JNIHandles::resolve_non_null(handle);
923 }
924 }
925
926
927 // Have to have the same name because it's called by a template
928 void nmethod::copy_values(GrowableArray<jobject>* array) {
929 int length = array->length();
930 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
931 oop* dest = oops_begin();
932 for (int index = 0 ; index < length; index++) {
933 initialize_immediate_oop(&dest[index], array->at(index));
934 }
935
936 // Now we can fix up all the oops in the code. We need to do this
937 // in the code because the assembler uses jobjects as placeholders.
938 // The code and relocations have already been initialized by the
939 // CodeBlob constructor, so it is valid even at this early point to
940 // iterate over relocations and patch the code.
941 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true);
942 }
943
944 void nmethod::copy_values(GrowableArray<Metadata*>* array) {
945 int length = array->length();
946 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough");
947 Metadata** dest = metadata_begin();
948 for (int index = 0 ; index < length; index++) {
949 dest[index] = array->at(index);
950 }
951 }
952
953 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) {
954 // re-patch all oop-bearing instructions, just in case some oops moved
955 RelocIterator iter(this, begin, end);
956 while (iter.next()) {
957 if (iter.type() == relocInfo::oop_type) {
958 oop_Relocation* reloc = iter.oop_reloc();
959 if (initialize_immediates && reloc->oop_is_immediate()) {
960 oop* dest = reloc->oop_addr();
961 initialize_immediate_oop(dest, (jobject) *dest);
962 }
963 // Refresh the oop-related bits of this instruction.
964 reloc->fix_oop_relocation();
965 } else if (iter.type() == relocInfo::metadata_type) {
966 metadata_Relocation* reloc = iter.metadata_reloc();
967 reloc->fix_metadata_relocation();
968 }
969 }
970 }
971
972
973 void nmethod::verify_clean_inline_caches() {
974 assert(CompiledICLocker::is_safe(this), "mt unsafe call");
975
976 ResourceMark rm;
977 RelocIterator iter(this, oops_reloc_begin());
978 while(iter.next()) {
979 switch(iter.type()) {
980 case relocInfo::virtual_call_type:
981 case relocInfo::opt_virtual_call_type: {
982 CompiledIC *ic = CompiledIC_at(&iter);
983 // Ok, to lookup references to zombies here
984 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
985 assert(cb != NULL, "destination not in CodeBlob?");
986 nmethod* nm = cb->as_nmethod_or_null();
987 if( nm != NULL ) {
988 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
989 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
990 assert(ic->is_clean(), "IC should be clean");
991 }
992 }
993 break;
994 }
995 case relocInfo::static_call_type: {
996 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
997 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
998 assert(cb != NULL, "destination not in CodeBlob?");
999 nmethod* nm = cb->as_nmethod_or_null();
1000 if( nm != NULL ) {
1001 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
1002 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1003 assert(csc->is_clean(), "IC should be clean");
1004 }
1005 }
1006 break;
1007 }
1008 default:
1009 break;
1010 }
1011 }
1012 }
1013
1014 // This is a private interface with the sweeper.
1015 void nmethod::mark_as_seen_on_stack() {
1016 assert(is_alive(), "Must be an alive method");
1017 // Set the traversal mark to ensure that the sweeper does 2
1018 // cleaning passes before moving to zombie.
1019 set_stack_traversal_mark(NMethodSweeper::traversal_count());
1020 }
1021
1022 // Tell if a non-entrant method can be converted to a zombie (i.e.,
1023 // there are no activations on the stack, not in use by the VM,
1024 // and not in use by the ServiceThread)
1025 bool nmethod::can_convert_to_zombie() {
1026 // Note that this is called when the sweeper has observed the nmethod to be
1027 // not_entrant. However, with concurrent code cache unloading, the state
1028 // might have moved on to unloaded if it is_unloading(), due to racing
1029 // concurrent GC threads.
1030 assert(is_not_entrant() || is_unloading(), "must be a non-entrant method");
1031
1032 // Since the nmethod sweeper only does partial sweep the sweeper's traversal
1033 // count can be greater than the stack traversal count before it hits the
1034 // nmethod for the second time.
1035 // If an is_unloading() nmethod is still not_entrant, then it is not safe to
1036 // convert it to zombie due to GC unloading interactions. However, if it
1037 // has become unloaded, then it is okay to convert such nmethods to zombie.
1038 return stack_traversal_mark() + 1 < NMethodSweeper::traversal_count() &&
1039 !is_locked_by_vm() && (!is_unloading() || is_unloaded());
1040 }
1041
1042 void nmethod::inc_decompile_count() {
1043 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return;
1044 // Could be gated by ProfileTraps, but do not bother...
1045 Method* m = method();
1046 if (m == NULL) return;
1047 MethodData* mdo = m->method_data();
1048 if (mdo == NULL) return;
1049 // There is a benign race here. See comments in methodData.hpp.
1050 mdo->inc_decompile_count();
1051 }
1052
1053 void nmethod::make_unloaded() {
1054 post_compiled_method_unload();
1055
1056 // This nmethod is being unloaded, make sure that dependencies
1057 // recorded in instanceKlasses get flushed.
1058 // Since this work is being done during a GC, defer deleting dependencies from the
1059 // InstanceKlass.
1060 assert(Universe::heap()->is_gc_active() || Thread::current()->is_ConcurrentGC_thread(),
1061 "should only be called during gc");
1062 flush_dependencies(/*delete_immediately*/false);
1063
1064 // Break cycle between nmethod & method
1065 LogTarget(Trace, class, unload, nmethod) lt;
1066 if (lt.is_enabled()) {
1067 LogStream ls(lt);
1068 ls.print("making nmethod " INTPTR_FORMAT
1069 " unloadable, Method*(" INTPTR_FORMAT
1070 ") ",
1071 p2i(this), p2i(_method));
1072 ls.cr();
1073 }
1074 // Unlink the osr method, so we do not look this up again
1075 if (is_osr_method()) {
1076 // Invalidate the osr nmethod only once
1077 if (is_in_use()) {
1078 invalidate_osr_method();
1079 }
1080 #ifdef ASSERT
1081 if (method() != NULL) {
1082 // Make sure osr nmethod is invalidated, i.e. not on the list
1083 bool found = method()->method_holder()->remove_osr_nmethod(this);
1084 assert(!found, "osr nmethod should have been invalidated");
1085 }
1086 #endif
1087 }
1088
1089 // If _method is already NULL the Method* is about to be unloaded,
1090 // so we don't have to break the cycle. Note that it is possible to
1091 // have the Method* live here, in case we unload the nmethod because
1092 // it is pointing to some oop (other than the Method*) being unloaded.
1093 if (_method != NULL) {
1094 // OSR methods point to the Method*, but the Method* does not
1095 // point back!
1096 if (_method->code() == this) {
1097 _method->clear_code(); // Break a cycle
1098 }
1099 _method = NULL; // Clear the method of this dead nmethod
1100 }
1101
1102 // Make the class unloaded - i.e., change state and notify sweeper
1103 assert(SafepointSynchronize::is_at_safepoint() || Thread::current()->is_ConcurrentGC_thread(),
1104 "must be at safepoint");
1105
1106 {
1107 // Clear ICStubs and release any CompiledICHolders.
1108 CompiledICLocker ml(this);
1109 clear_ic_callsites();
1110 }
1111
1112 // Unregister must be done before the state change
1113 {
1114 MutexLockerEx ml(SafepointSynchronize::is_at_safepoint() ? NULL : CodeCache_lock,
1115 Mutex::_no_safepoint_check_flag);
1116 Universe::heap()->unregister_nmethod(this);
1117 }
1118
1119 // Log the unloading.
1120 log_state_change();
1121
1122 #if INCLUDE_JVMCI
1123 // The method can only be unloaded after the pointer to the installed code
1124 // Java wrapper is no longer alive. Here we need to clear out this weak
1125 // reference to the dead object.
1126 maybe_invalidate_installed_code();
1127 #endif
1128
1129 // The Method* is gone at this point
1130 assert(_method == NULL, "Tautology");
1131
1132 set_osr_link(NULL);
1133 NMethodSweeper::report_state_change(this);
1134
1135 // The release is only needed for compile-time ordering, as accesses
1136 // into the nmethod after the store are not safe due to the sweeper
1137 // being allowed to free it when the store is observed, during
1138 // concurrent nmethod unloading. Therefore, there is no need for
1139 // acquire on the loader side.
1140 OrderAccess::release_store(&_state, (signed char)unloaded);
1141 }
1142
1143 void nmethod::invalidate_osr_method() {
1144 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
1145 // Remove from list of active nmethods
1146 if (method() != NULL) {
1147 method()->method_holder()->remove_osr_nmethod(this);
1148 }
1149 }
1150
1151 void nmethod::log_state_change() const {
1152 if (LogCompilation) {
1153 if (xtty != NULL) {
1154 ttyLocker ttyl; // keep the following output all in one block
1155 if (_state == unloaded) {
1156 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'",
1157 os::current_thread_id());
1158 } else {
1159 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s",
1160 os::current_thread_id(),
1161 (_state == zombie ? " zombie='1'" : ""));
1162 }
1163 log_identity(xtty);
1164 xtty->stamp();
1165 xtty->end_elem();
1166 }
1167 }
1168
1169 const char *state_msg = _state == zombie ? "made zombie" : "made not entrant";
1170 CompileTask::print_ul(this, state_msg);
1171 if (PrintCompilation && _state != unloaded) {
1172 print_on(tty, state_msg);
1173 }
1174 }
1175
1176 void nmethod::unlink_from_method(bool acquire_lock) {
1177 // We need to check if both the _code and _from_compiled_code_entry_point
1178 // refer to this nmethod because there is a race in setting these two fields
1179 // in Method* as seen in bugid 4947125.
1180 // If the vep() points to the zombie nmethod, the memory for the nmethod
1181 // could be flushed and the compiler and vtable stubs could still call
1182 // through it.
1183 if (method() != NULL && (method()->code() == this ||
1184 method()->from_compiled_entry() == verified_entry_point())) {
1185 method()->clear_code(acquire_lock);
1186 }
1187 }
1188
1189 /**
1190 * Common functionality for both make_not_entrant and make_zombie
1191 */
1192 bool nmethod::make_not_entrant_or_zombie(int state) {
1193 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant");
1194 assert(!is_zombie(), "should not already be a zombie");
1195
1196 if (_state == state) {
1197 // Avoid taking the lock if already in required state.
1198 // This is safe from races because the state is an end-state,
1199 // which the nmethod cannot back out of once entered.
1200 // No need for fencing either.
1201 return false;
1202 }
1203
1204 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below.
1205 nmethodLocker nml(this);
1206 methodHandle the_method(method());
1207 // This can be called while the system is already at a safepoint which is ok
1208 NoSafepointVerifier nsv(true, !SafepointSynchronize::is_at_safepoint());
1209
1210 // during patching, depending on the nmethod state we must notify the GC that
1211 // code has been unloaded, unregistering it. We cannot do this right while
1212 // holding the Patching_lock because we need to use the CodeCache_lock. This
1213 // would be prone to deadlocks.
1214 // This flag is used to remember whether we need to later lock and unregister.
1215 bool nmethod_needs_unregister = false;
1216
1217 {
1218 // invalidate osr nmethod before acquiring the patching lock since
1219 // they both acquire leaf locks and we don't want a deadlock.
1220 // This logic is equivalent to the logic below for patching the
1221 // verified entry point of regular methods. We check that the
1222 // nmethod is in use to ensure that it is invalidated only once.
1223 if (is_osr_method() && is_in_use()) {
1224 // this effectively makes the osr nmethod not entrant
1225 invalidate_osr_method();
1226 }
1227
1228 // Enter critical section. Does not block for safepoint.
1229 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1230
1231 if (_state == state) {
1232 // another thread already performed this transition so nothing
1233 // to do, but return false to indicate this.
1234 return false;
1235 }
1236
1237 // The caller can be calling the method statically or through an inline
1238 // cache call.
1239 if (!is_osr_method() && !is_not_entrant()) {
1240 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
1241 SharedRuntime::get_handle_wrong_method_stub());
1242 }
1243
1244 if (is_in_use() && update_recompile_counts()) {
1245 // It's a true state change, so mark the method as decompiled.
1246 // Do it only for transition from alive.
1247 inc_decompile_count();
1248 }
1249
1250 // If the state is becoming a zombie, signal to unregister the nmethod with
1251 // the heap.
1252 // This nmethod may have already been unloaded during a full GC.
1253 if ((state == zombie) && !is_unloaded()) {
1254 nmethod_needs_unregister = true;
1255 }
1256
1257 // Must happen before state change. Otherwise we have a race condition in
1258 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately
1259 // transition its state from 'not_entrant' to 'zombie' without having to wait
1260 // for stack scanning.
1261 if (state == not_entrant) {
1262 mark_as_seen_on_stack();
1263 OrderAccess::storestore(); // _stack_traversal_mark and _state
1264 }
1265
1266 // Change state
1267 _state = state;
1268
1269 // Log the transition once
1270 log_state_change();
1271
1272 // Invalidate while holding the patching lock
1273 JVMCI_ONLY(maybe_invalidate_installed_code());
1274
1275 // Remove nmethod from method.
1276 unlink_from_method(false /* already owns Patching_lock */);
1277 } // leave critical region under Patching_lock
1278
1279 #ifdef ASSERT
1280 if (is_osr_method() && method() != NULL) {
1281 // Make sure osr nmethod is invalidated, i.e. not on the list
1282 bool found = method()->method_holder()->remove_osr_nmethod(this);
1283 assert(!found, "osr nmethod should have been invalidated");
1284 }
1285 #endif
1286
1287 // When the nmethod becomes zombie it is no longer alive so the
1288 // dependencies must be flushed. nmethods in the not_entrant
1289 // state will be flushed later when the transition to zombie
1290 // happens or they get unloaded.
1291 if (state == zombie) {
1292 {
1293 // Flushing dependencies must be done before any possible
1294 // safepoint can sneak in, otherwise the oops used by the
1295 // dependency logic could have become stale.
1296 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1297 if (nmethod_needs_unregister) {
1298 Universe::heap()->unregister_nmethod(this);
1299 }
1300 flush_dependencies(/*delete_immediately*/true);
1301 }
1302
1303 // Clear ICStubs to prevent back patching stubs of zombie or flushed
1304 // nmethods during the next safepoint (see ICStub::finalize), as well
1305 // as to free up CompiledICHolder resources.
1306 {
1307 CompiledICLocker ml(this);
1308 clear_ic_callsites();
1309 }
1310
1311 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload
1312 // event and it hasn't already been reported for this nmethod then
1313 // report it now. The event may have been reported earlier if the GC
1314 // marked it for unloading). JvmtiDeferredEventQueue support means
1315 // we no longer go to a safepoint here.
1316 post_compiled_method_unload();
1317
1318 #ifdef ASSERT
1319 // It's no longer safe to access the oops section since zombie
1320 // nmethods aren't scanned for GC.
1321 _oops_are_stale = true;
1322 #endif
1323 // the Method may be reclaimed by class unloading now that the
1324 // nmethod is in zombie state
1325 set_method(NULL);
1326 } else {
1327 assert(state == not_entrant, "other cases may need to be handled differently");
1328 }
1329
1330 if (TraceCreateZombies) {
1331 ResourceMark m;
1332 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");
1333 }
1334
1335 NMethodSweeper::report_state_change(this);
1336 return true;
1337 }
1338
1339 void nmethod::flush() {
1340 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1341 // Note that there are no valid oops in the nmethod anymore.
1342 assert(!is_osr_method() || is_unloaded() || is_zombie(),
1343 "osr nmethod must be unloaded or zombie before flushing");
1344 assert(is_zombie() || is_osr_method(), "must be a zombie method");
1345 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed");
1346 assert_locked_or_safepoint(CodeCache_lock);
1347
1348 // completely deallocate this method
1349 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, p2i(this));
1350 if (PrintMethodFlushing) {
1351 tty->print_cr("*flushing %s nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT
1352 "/Free CodeCache:" SIZE_FORMAT "Kb",
1353 is_osr_method() ? "osr" : "",_compile_id, p2i(this), CodeCache::blob_count(),
1354 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024);
1355 }
1356
1357 // We need to deallocate any ExceptionCache data.
1358 // Note that we do not need to grab the nmethod lock for this, it
1359 // better be thread safe if we're disposing of it!
1360 ExceptionCache* ec = exception_cache();
1361 set_exception_cache(NULL);
1362 while(ec != NULL) {
1363 ExceptionCache* next = ec->next();
1364 delete ec;
1365 ec = next;
1366 }
1367
1368 if (on_scavenge_root_list()) {
1369 CodeCache::drop_scavenge_root_nmethod(this);
1370 }
1371
1372 #if INCLUDE_JVMCI
1373 assert(_jvmci_installed_code == NULL, "should have been nulled out when transitioned to zombie");
1374 assert(_speculation_log == NULL, "should have been nulled out when transitioned to zombie");
1375 #endif
1376
1377 Universe::heap()->flush_nmethod(this);
1378
1379 CodeBlob::flush();
1380 CodeCache::free(this);
1381 }
1382
1383 oop nmethod::oop_at(int index) const {
1384 if (index == 0) {
1385 return NULL;
1386 }
1387 return NativeAccess<AS_NO_KEEPALIVE>::oop_load(oop_addr_at(index));
1388 }
1389
1390 //
1391 // Notify all classes this nmethod is dependent on that it is no
1392 // longer dependent. This should only be called in two situations.
1393 // First, when a nmethod transitions to a zombie all dependents need
1394 // to be clear. Since zombification happens at a safepoint there's no
1395 // synchronization issues. The second place is a little more tricky.
1396 // During phase 1 of mark sweep class unloading may happen and as a
1397 // result some nmethods may get unloaded. In this case the flushing
1398 // of dependencies must happen during phase 1 since after GC any
1399 // dependencies in the unloaded nmethod won't be updated, so
1400 // traversing the dependency information in unsafe. In that case this
1401 // function is called with a boolean argument and this function only
1402 // notifies instanceKlasses that are reachable
1403
1404 void nmethod::flush_dependencies(bool delete_immediately) {
1405 DEBUG_ONLY(bool called_by_gc = Universe::heap()->is_gc_active() || Thread::current()->is_ConcurrentGC_thread();)
1406 assert(called_by_gc != delete_immediately,
1407 "delete_immediately is false if and only if we are called during GC");
1408 if (!has_flushed_dependencies()) {
1409 set_has_flushed_dependencies();
1410 for (Dependencies::DepStream deps(this); deps.next(); ) {
1411 if (deps.type() == Dependencies::call_site_target_value) {
1412 // CallSite dependencies are managed on per-CallSite instance basis.
1413 oop call_site = deps.argument_oop(0);
1414 if (delete_immediately) {
1415 assert_locked_or_safepoint(CodeCache_lock);
1416 MethodHandles::remove_dependent_nmethod(call_site, this);
1417 } else {
1418 MethodHandles::clean_dependency_context(call_site);
1419 }
1420 } else {
1421 Klass* klass = deps.context_type();
1422 if (klass == NULL) {
1423 continue; // ignore things like evol_method
1424 }
1425 // During GC delete_immediately is false, and liveness
1426 // of dependee determines class that needs to be updated.
1427 if (delete_immediately) {
1428 assert_locked_or_safepoint(CodeCache_lock);
1429 InstanceKlass::cast(klass)->remove_dependent_nmethod(this);
1430 } else if (klass->is_loader_alive()) {
1431 // The GC may clean dependency contexts concurrently and in parallel.
1432 InstanceKlass::cast(klass)->clean_dependency_context();
1433 }
1434 }
1435 }
1436 }
1437 }
1438
1439 // ------------------------------------------------------------------
1440 // post_compiled_method_load_event
1441 // new method for install_code() path
1442 // Transfer information from compilation to jvmti
1443 void nmethod::post_compiled_method_load_event() {
1444
1445 Method* moop = method();
1446 HOTSPOT_COMPILED_METHOD_LOAD(
1447 (char *) moop->klass_name()->bytes(),
1448 moop->klass_name()->utf8_length(),
1449 (char *) moop->name()->bytes(),
1450 moop->name()->utf8_length(),
1451 (char *) moop->signature()->bytes(),
1452 moop->signature()->utf8_length(),
1453 insts_begin(), insts_size());
1454
1455 if (JvmtiExport::should_post_compiled_method_load() ||
1456 JvmtiExport::should_post_compiled_method_unload()) {
1457 get_and_cache_jmethod_id();
1458 }
1459
1460 if (JvmtiExport::should_post_compiled_method_load()) {
1461 // Let the Service thread (which is a real Java thread) post the event
1462 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1463 JvmtiDeferredEventQueue::enqueue(
1464 JvmtiDeferredEvent::compiled_method_load_event(this));
1465 }
1466 }
1467
1468 jmethodID nmethod::get_and_cache_jmethod_id() {
1469 if (_jmethod_id == NULL) {
1470 // Cache the jmethod_id since it can no longer be looked up once the
1471 // method itself has been marked for unloading.
1472 _jmethod_id = method()->jmethod_id();
1473 }
1474 return _jmethod_id;
1475 }
1476
1477 void nmethod::post_compiled_method_unload() {
1478 if (unload_reported()) {
1479 // During unloading we transition to unloaded and then to zombie
1480 // and the unloading is reported during the first transition.
1481 return;
1482 }
1483
1484 assert(_method != NULL && !is_unloaded(), "just checking");
1485 DTRACE_METHOD_UNLOAD_PROBE(method());
1486
1487 // If a JVMTI agent has enabled the CompiledMethodUnload event then
1488 // post the event. Sometime later this nmethod will be made a zombie
1489 // by the sweeper but the Method* will not be valid at that point.
1490 // If the _jmethod_id is null then no load event was ever requested
1491 // so don't bother posting the unload. The main reason for this is
1492 // that the jmethodID is a weak reference to the Method* so if
1493 // it's being unloaded there's no way to look it up since the weak
1494 // ref will have been cleared.
1495 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) {
1496 assert(!unload_reported(), "already unloaded");
1497 JvmtiDeferredEvent event =
1498 JvmtiDeferredEvent::compiled_method_unload_event(this,
1499 _jmethod_id, insts_begin());
1500 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1501 JvmtiDeferredEventQueue::enqueue(event);
1502 }
1503
1504 // The JVMTI CompiledMethodUnload event can be enabled or disabled at
1505 // any time. As the nmethod is being unloaded now we mark it has
1506 // having the unload event reported - this will ensure that we don't
1507 // attempt to report the event in the unlikely scenario where the
1508 // event is enabled at the time the nmethod is made a zombie.
1509 set_unload_reported();
1510 }
1511
1512 // Iterate over metadata calling this function. Used by RedefineClasses
1513 void nmethod::metadata_do(void f(Metadata*)) {
1514 {
1515 // Visit all immediate references that are embedded in the instruction stream.
1516 RelocIterator iter(this, oops_reloc_begin());
1517 while (iter.next()) {
1518 if (iter.type() == relocInfo::metadata_type ) {
1519 metadata_Relocation* r = iter.metadata_reloc();
1520 // In this metadata, we must only follow those metadatas directly embedded in
1521 // the code. Other metadatas (oop_index>0) are seen as part of
1522 // the metadata section below.
1523 assert(1 == (r->metadata_is_immediate()) +
1524 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
1525 "metadata must be found in exactly one place");
1526 if (r->metadata_is_immediate() && r->metadata_value() != NULL) {
1527 Metadata* md = r->metadata_value();
1528 if (md != _method) f(md);
1529 }
1530 } else if (iter.type() == relocInfo::virtual_call_type) {
1531 // Check compiledIC holders associated with this nmethod
1532 ResourceMark rm;
1533 CompiledIC *ic = CompiledIC_at(&iter);
1534 if (ic->is_icholder_call()) {
1535 CompiledICHolder* cichk = ic->cached_icholder();
1536 f(cichk->holder_metadata());
1537 f(cichk->holder_klass());
1538 } else {
1539 Metadata* ic_oop = ic->cached_metadata();
1540 if (ic_oop != NULL) {
1541 f(ic_oop);
1542 }
1543 }
1544 }
1545 }
1546 }
1547
1548 // Visit the metadata section
1549 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
1550 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops
1551 Metadata* md = *p;
1552 f(md);
1553 }
1554
1555 // Visit metadata not embedded in the other places.
1556 if (_method != NULL) f(_method);
1557 }
1558
1559 // The _is_unloading_state encodes a tuple comprising the unloading cycle
1560 // and the result of IsUnloadingBehaviour::is_unloading() fpr that cycle.
1561 // This is the bit layout of the _is_unloading_state byte: 00000CCU
1562 // CC refers to the cycle, which has 2 bits, and U refers to the result of
1563 // IsUnloadingBehaviour::is_unloading() for that unloading cycle.
1564
1565 class IsUnloadingState: public AllStatic {
1566 static const uint8_t _is_unloading_mask = 1;
1567 static const uint8_t _is_unloading_shift = 0;
1568 static const uint8_t _unloading_cycle_mask = 6;
1569 static const uint8_t _unloading_cycle_shift = 1;
1570
1571 static uint8_t set_is_unloading(uint8_t state, bool value) {
1572 state &= ~_is_unloading_mask;
1573 if (value) {
1574 state |= 1 << _is_unloading_shift;
1575 }
1576 assert(is_unloading(state) == value, "unexpected unloading cycle overflow");
1577 return state;
1578 }
1579
1580 static uint8_t set_unloading_cycle(uint8_t state, uint8_t value) {
1581 state &= ~_unloading_cycle_mask;
1582 state |= value << _unloading_cycle_shift;
1583 assert(unloading_cycle(state) == value, "unexpected unloading cycle overflow");
1584 return state;
1585 }
1586
1587 public:
1588 static bool is_unloading(uint8_t state) { return (state & _is_unloading_mask) >> _is_unloading_shift == 1; }
1589 static uint8_t unloading_cycle(uint8_t state) { return (state & _unloading_cycle_mask) >> _unloading_cycle_shift; }
1590
1591 static uint8_t create(bool is_unloading, uint8_t unloading_cycle) {
1592 uint8_t state = 0;
1593 state = set_is_unloading(state, is_unloading);
1594 state = set_unloading_cycle(state, unloading_cycle);
1595 return state;
1596 }
1597 };
1598
1599 bool nmethod::is_unloading() {
1600 uint8_t state = RawAccess<MO_RELAXED>::load(&_is_unloading_state);
1601 bool state_is_unloading = IsUnloadingState::is_unloading(state);
1602 uint8_t state_unloading_cycle = IsUnloadingState::unloading_cycle(state);
1603 if (state_is_unloading) {
1604 return true;
1605 }
1606 uint8_t current_cycle = CodeCache::unloading_cycle();
1607 if (state_unloading_cycle == current_cycle) {
1608 return false;
1609 }
1610
1611 // The IsUnloadingBehaviour is responsible for checking if there are any dead
1612 // oops in the CompiledMethod, by calling oops_do on it.
1613 state_unloading_cycle = current_cycle;
1614
1615 if (is_zombie()) {
1616 // Zombies without calculated unloading epoch are never unloading due to GC.
1617
1618 // There are no races where a previously observed is_unloading() nmethod
1619 // suddenly becomes not is_unloading() due to here being observed as zombie.
1620
1621 // With STW unloading, all is_alive() && is_unloading() nmethods are unlinked
1622 // and unloaded in the safepoint. That makes races where an nmethod is first
1623 // observed as is_alive() && is_unloading() and subsequently observed as
1624 // is_zombie() impossible.
1625
1626 // With concurrent unloading, all references to is_unloading() nmethods are
1627 // first unlinked (e.g. IC caches and dependency contexts). Then a global
1628 // handshake operation is performed with all JavaThreads before finally
1629 // unloading the nmethods. The sweeper never converts is_alive() && is_unloading()
1630 // nmethods to zombies; it waits for them to become is_unloaded(). So before
1631 // the global handshake, it is impossible for is_unloading() nmethods to
1632 // racingly become is_zombie(). And is_unloading() is calculated for all is_alive()
1633 // nmethods before taking that global handshake, meaning that it will never
1634 // be recalculated after the handshake.
1635
1636 // After that global handshake, is_unloading() nmethods are only observable
1637 // to the iterators, and they will never trigger recomputation of the cached
1638 // is_unloading_state, and hence may not suffer from such races.
1639
1640 state_is_unloading = false;
1641 } else {
1642 state_is_unloading = IsUnloadingBehaviour::current()->is_unloading(this);
1643 }
1644
1645 state = IsUnloadingState::create(state_is_unloading, state_unloading_cycle);
1646
1647 RawAccess<MO_RELAXED>::store(&_is_unloading_state, state);
1648
1649 return state_is_unloading;
1650 }
1651
1652 void nmethod::clear_unloading_state() {
1653 uint8_t state = IsUnloadingState::create(false, CodeCache::unloading_cycle());
1654 RawAccess<MO_RELAXED>::store(&_is_unloading_state, state);
1655 }
1656
1657
1658 // This is called at the end of the strong tracing/marking phase of a
1659 // GC to unload an nmethod if it contains otherwise unreachable
1660 // oops.
1661
1662 void nmethod::do_unloading(bool unloading_occurred) {
1663 // Make sure the oop's ready to receive visitors
1664 assert(!is_zombie() && !is_unloaded(),
1665 "should not call follow on zombie or unloaded nmethod");
1666
1667 if (is_unloading()) {
1668 make_unloaded();
1669 } else {
1670 #if INCLUDE_JVMCI
1671 if (_jvmci_installed_code != NULL) {
1672 if (JNIHandles::is_global_weak_cleared(_jvmci_installed_code)) {
1673 if (_jvmci_installed_code_triggers_invalidation) {
1674 make_not_entrant();
1675 }
1676 clear_jvmci_installed_code();
1677 }
1678 }
1679 #endif
1680
1681 guarantee(unload_nmethod_caches(unloading_occurred),
1682 "Should not need transition stubs");
1683 }
1684 }
1685
1686 void nmethod::oops_do(OopClosure* f, bool allow_zombie) {
1687 // make sure the oops ready to receive visitors
1688 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod");
1689 assert(!is_unloaded(), "should not call follow on unloaded nmethod");
1690
1691 // Prevent extra code cache walk for platforms that don't have immediate oops.
1692 if (relocInfo::mustIterateImmediateOopsInCode()) {
1693 RelocIterator iter(this, oops_reloc_begin());
1694
1695 while (iter.next()) {
1696 if (iter.type() == relocInfo::oop_type ) {
1697 oop_Relocation* r = iter.oop_reloc();
1698 // In this loop, we must only follow those oops directly embedded in
1699 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1700 assert(1 == (r->oop_is_immediate()) +
1701 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1702 "oop must be found in exactly one place");
1703 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1704 f->do_oop(r->oop_addr());
1705 }
1706 }
1707 }
1708 }
1709
1710 // Scopes
1711 // This includes oop constants not inlined in the code stream.
1712 for (oop* p = oops_begin(); p < oops_end(); p++) {
1713 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1714 f->do_oop(p);
1715 }
1716 }
1717
1718 #define NMETHOD_SENTINEL ((nmethod*)badAddress)
1719
1720 nmethod* volatile nmethod::_oops_do_mark_nmethods;
1721
1722 // An nmethod is "marked" if its _mark_link is set non-null.
1723 // Even if it is the end of the linked list, it will have a non-null link value,
1724 // as long as it is on the list.
1725 // This code must be MP safe, because it is used from parallel GC passes.
1726 bool nmethod::test_set_oops_do_mark() {
1727 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");
1728 if (_oops_do_mark_link == NULL) {
1729 // Claim this nmethod for this thread to mark.
1730 if (Atomic::replace_if_null(NMETHOD_SENTINEL, &_oops_do_mark_link)) {
1731 // Atomically append this nmethod (now claimed) to the head of the list:
1732 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods;
1733 for (;;) {
1734 nmethod* required_mark_nmethods = observed_mark_nmethods;
1735 _oops_do_mark_link = required_mark_nmethods;
1736 observed_mark_nmethods =
1737 Atomic::cmpxchg(this, &_oops_do_mark_nmethods, required_mark_nmethods);
1738 if (observed_mark_nmethods == required_mark_nmethods)
1739 break;
1740 }
1741 // Mark was clear when we first saw this guy.
1742 LogTarget(Trace, gc, nmethod) lt;
1743 if (lt.is_enabled()) {
1744 LogStream ls(lt);
1745 CompileTask::print(&ls, this, "oops_do, mark", /*short_form:*/ true);
1746 }
1747 return false;
1748 }
1749 }
1750 // On fall through, another racing thread marked this nmethod before we did.
1751 return true;
1752 }
1753
1754 void nmethod::oops_do_marking_prologue() {
1755 log_trace(gc, nmethod)("oops_do_marking_prologue");
1756 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row");
1757 // We use cmpxchg instead of regular assignment here because the user
1758 // may fork a bunch of threads, and we need them all to see the same state.
1759 nmethod* observed = Atomic::cmpxchg(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, (nmethod*)NULL);
1760 guarantee(observed == NULL, "no races in this sequential code");
1761 }
1762
1763 void nmethod::oops_do_marking_epilogue() {
1764 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row");
1765 nmethod* cur = _oops_do_mark_nmethods;
1766 while (cur != NMETHOD_SENTINEL) {
1767 assert(cur != NULL, "not NULL-terminated");
1768 nmethod* next = cur->_oops_do_mark_link;
1769 cur->_oops_do_mark_link = NULL;
1770 DEBUG_ONLY(cur->verify_oop_relocations());
1771
1772 LogTarget(Trace, gc, nmethod) lt;
1773 if (lt.is_enabled()) {
1774 LogStream ls(lt);
1775 CompileTask::print(&ls, cur, "oops_do, unmark", /*short_form:*/ true);
1776 }
1777 cur = next;
1778 }
1779 nmethod* required = _oops_do_mark_nmethods;
1780 nmethod* observed = Atomic::cmpxchg((nmethod*)NULL, &_oops_do_mark_nmethods, required);
1781 guarantee(observed == required, "no races in this sequential code");
1782 log_trace(gc, nmethod)("oops_do_marking_epilogue");
1783 }
1784
1785 class DetectScavengeRoot: public OopClosure {
1786 bool _detected_scavenge_root;
1787 nmethod* _print_nm;
1788 public:
1789 DetectScavengeRoot(nmethod* nm) : _detected_scavenge_root(false), _print_nm(nm) {}
1790
1791 bool detected_scavenge_root() { return _detected_scavenge_root; }
1792 virtual void do_oop(oop* p) {
1793 if ((*p) != NULL && Universe::heap()->is_scavengable(*p)) {
1794 NOT_PRODUCT(maybe_print(p));
1795 _detected_scavenge_root = true;
1796 }
1797 }
1798 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
1799
1800 #ifndef PRODUCT
1801 void maybe_print(oop* p) {
1802 LogTarget(Trace, gc, nmethod) lt;
1803 if (lt.is_enabled()) {
1804 LogStream ls(lt);
1805 if (!_detected_scavenge_root) {
1806 CompileTask::print(&ls, _print_nm, "new scavenge root", /*short_form:*/ true);
1807 }
1808 ls.print("" PTR_FORMAT "[offset=%d] detected scavengable oop " PTR_FORMAT " (found at " PTR_FORMAT ") ",
1809 p2i(_print_nm), (int)((intptr_t)p - (intptr_t)_print_nm),
1810 p2i(*p), p2i(p));
1811 ls.cr();
1812 }
1813 }
1814 #endif //PRODUCT
1815 };
1816
1817 bool nmethod::detect_scavenge_root_oops() {
1818 DetectScavengeRoot detect_scavenge_root(this);
1819 oops_do(&detect_scavenge_root);
1820 return detect_scavenge_root.detected_scavenge_root();
1821 }
1822
1823 inline bool includes(void* p, void* from, void* to) {
1824 return from <= p && p < to;
1825 }
1826
1827
1828 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
1829 assert(count >= 2, "must be sentinel values, at least");
1830
1831 #ifdef ASSERT
1832 // must be sorted and unique; we do a binary search in find_pc_desc()
1833 int prev_offset = pcs[0].pc_offset();
1834 assert(prev_offset == PcDesc::lower_offset_limit,
1835 "must start with a sentinel");
1836 for (int i = 1; i < count; i++) {
1837 int this_offset = pcs[i].pc_offset();
1838 assert(this_offset > prev_offset, "offsets must be sorted");
1839 prev_offset = this_offset;
1840 }
1841 assert(prev_offset == PcDesc::upper_offset_limit,
1842 "must end with a sentinel");
1843 #endif //ASSERT
1844
1845 // Search for MethodHandle invokes and tag the nmethod.
1846 for (int i = 0; i < count; i++) {
1847 if (pcs[i].is_method_handle_invoke()) {
1848 set_has_method_handle_invokes(true);
1849 break;
1850 }
1851 }
1852 assert(has_method_handle_invokes() == (_deopt_mh_handler_begin != NULL), "must have deopt mh handler");
1853
1854 int size = count * sizeof(PcDesc);
1855 assert(scopes_pcs_size() >= size, "oob");
1856 memcpy(scopes_pcs_begin(), pcs, size);
1857
1858 // Adjust the final sentinel downward.
1859 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
1860 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
1861 last_pc->set_pc_offset(content_size() + 1);
1862 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
1863 // Fill any rounding gaps with copies of the last record.
1864 last_pc[1] = last_pc[0];
1865 }
1866 // The following assert could fail if sizeof(PcDesc) is not
1867 // an integral multiple of oopSize (the rounding term).
1868 // If it fails, change the logic to always allocate a multiple
1869 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
1870 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
1871 }
1872
1873 void nmethod::copy_scopes_data(u_char* buffer, int size) {
1874 assert(scopes_data_size() >= size, "oob");
1875 memcpy(scopes_data_begin(), buffer, size);
1876 }
1877
1878 #ifdef ASSERT
1879 static PcDesc* linear_search(const PcDescSearch& search, int pc_offset, bool approximate) {
1880 PcDesc* lower = search.scopes_pcs_begin();
1881 PcDesc* upper = search.scopes_pcs_end();
1882 lower += 1; // exclude initial sentinel
1883 PcDesc* res = NULL;
1884 for (PcDesc* p = lower; p < upper; p++) {
1885 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc
1886 if (match_desc(p, pc_offset, approximate)) {
1887 if (res == NULL)
1888 res = p;
1889 else
1890 res = (PcDesc*) badAddress;
1891 }
1892 }
1893 return res;
1894 }
1895 #endif
1896
1897
1898 // Finds a PcDesc with real-pc equal to "pc"
1899 PcDesc* PcDescContainer::find_pc_desc_internal(address pc, bool approximate, const PcDescSearch& search) {
1900 address base_address = search.code_begin();
1901 if ((pc < base_address) ||
1902 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
1903 return NULL; // PC is wildly out of range
1904 }
1905 int pc_offset = (int) (pc - base_address);
1906
1907 // Check the PcDesc cache if it contains the desired PcDesc
1908 // (This as an almost 100% hit rate.)
1909 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
1910 if (res != NULL) {
1911 assert(res == linear_search(search, pc_offset, approximate), "cache ok");
1912 return res;
1913 }
1914
1915 // Fallback algorithm: quasi-linear search for the PcDesc
1916 // Find the last pc_offset less than the given offset.
1917 // The successor must be the required match, if there is a match at all.
1918 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
1919 PcDesc* lower = search.scopes_pcs_begin();
1920 PcDesc* upper = search.scopes_pcs_end();
1921 upper -= 1; // exclude final sentinel
1922 if (lower >= upper) return NULL; // native method; no PcDescs at all
1923
1924 #define assert_LU_OK \
1925 /* invariant on lower..upper during the following search: */ \
1926 assert(lower->pc_offset() < pc_offset, "sanity"); \
1927 assert(upper->pc_offset() >= pc_offset, "sanity")
1928 assert_LU_OK;
1929
1930 // Use the last successful return as a split point.
1931 PcDesc* mid = _pc_desc_cache.last_pc_desc();
1932 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1933 if (mid->pc_offset() < pc_offset) {
1934 lower = mid;
1935 } else {
1936 upper = mid;
1937 }
1938
1939 // Take giant steps at first (4096, then 256, then 16, then 1)
1940 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
1941 const int RADIX = (1 << LOG2_RADIX);
1942 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
1943 while ((mid = lower + step) < upper) {
1944 assert_LU_OK;
1945 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1946 if (mid->pc_offset() < pc_offset) {
1947 lower = mid;
1948 } else {
1949 upper = mid;
1950 break;
1951 }
1952 }
1953 assert_LU_OK;
1954 }
1955
1956 // Sneak up on the value with a linear search of length ~16.
1957 while (true) {
1958 assert_LU_OK;
1959 mid = lower + 1;
1960 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1961 if (mid->pc_offset() < pc_offset) {
1962 lower = mid;
1963 } else {
1964 upper = mid;
1965 break;
1966 }
1967 }
1968 #undef assert_LU_OK
1969
1970 if (match_desc(upper, pc_offset, approximate)) {
1971 assert(upper == linear_search(search, pc_offset, approximate), "search ok");
1972 _pc_desc_cache.add_pc_desc(upper);
1973 return upper;
1974 } else {
1975 assert(NULL == linear_search(search, pc_offset, approximate), "search ok");
1976 return NULL;
1977 }
1978 }
1979
1980
1981 void nmethod::check_all_dependencies(DepChange& changes) {
1982 // Checked dependencies are allocated into this ResourceMark
1983 ResourceMark rm;
1984
1985 // Turn off dependency tracing while actually testing dependencies.
1986 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) );
1987
1988 typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash,
1989 &DependencySignature::equals, 11027> DepTable;
1990
1991 DepTable* table = new DepTable();
1992
1993 // Iterate over live nmethods and check dependencies of all nmethods that are not
1994 // marked for deoptimization. A particular dependency is only checked once.
1995 NMethodIterator iter(NMethodIterator::only_alive_and_not_unloading);
1996 while(iter.next()) {
1997 nmethod* nm = iter.method();
1998 // Only notify for live nmethods
1999 if (!nm->is_marked_for_deoptimization()) {
2000 for (Dependencies::DepStream deps(nm); deps.next(); ) {
2001 // Construct abstraction of a dependency.
2002 DependencySignature* current_sig = new DependencySignature(deps);
2003
2004 // Determine if dependency is already checked. table->put(...) returns
2005 // 'true' if the dependency is added (i.e., was not in the hashtable).
2006 if (table->put(*current_sig, 1)) {
2007 if (deps.check_dependency() != NULL) {
2008 // Dependency checking failed. Print out information about the failed
2009 // dependency and finally fail with an assert. We can fail here, since
2010 // dependency checking is never done in a product build.
2011 tty->print_cr("Failed dependency:");
2012 changes.print();
2013 nm->print();
2014 nm->print_dependencies();
2015 assert(false, "Should have been marked for deoptimization");
2016 }
2017 }
2018 }
2019 }
2020 }
2021 }
2022
2023 bool nmethod::check_dependency_on(DepChange& changes) {
2024 // What has happened:
2025 // 1) a new class dependee has been added
2026 // 2) dependee and all its super classes have been marked
2027 bool found_check = false; // set true if we are upset
2028 for (Dependencies::DepStream deps(this); deps.next(); ) {
2029 // Evaluate only relevant dependencies.
2030 if (deps.spot_check_dependency_at(changes) != NULL) {
2031 found_check = true;
2032 NOT_DEBUG(break);
2033 }
2034 }
2035 return found_check;
2036 }
2037
2038 bool nmethod::is_evol_dependent() {
2039 for (Dependencies::DepStream deps(this); deps.next(); ) {
2040 if (deps.type() == Dependencies::evol_method) {
2041 Method* method = deps.method_argument(0);
2042 if (method->is_old()) {
2043 if (log_is_enabled(Debug, redefine, class, nmethod)) {
2044 ResourceMark rm;
2045 log_debug(redefine, class, nmethod)
2046 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)",
2047 _method->method_holder()->external_name(),
2048 _method->name()->as_C_string(),
2049 _method->signature()->as_C_string(),
2050 compile_id(),
2051 method->method_holder()->external_name(),
2052 method->name()->as_C_string(),
2053 method->signature()->as_C_string());
2054 }
2055 if (TraceDependencies || LogCompilation)
2056 deps.log_dependency(method->method_holder());
2057 return true;
2058 }
2059 }
2060 }
2061 return false;
2062 }
2063
2064 // Called from mark_for_deoptimization, when dependee is invalidated.
2065 bool nmethod::is_dependent_on_method(Method* dependee) {
2066 for (Dependencies::DepStream deps(this); deps.next(); ) {
2067 if (deps.type() != Dependencies::evol_method)
2068 continue;
2069 Method* method = deps.method_argument(0);
2070 if (method == dependee) return true;
2071 }
2072 return false;
2073 }
2074
2075
2076 bool nmethod::is_patchable_at(address instr_addr) {
2077 assert(insts_contains(instr_addr), "wrong nmethod used");
2078 if (is_zombie()) {
2079 // a zombie may never be patched
2080 return false;
2081 }
2082 return true;
2083 }
2084
2085
2086 address nmethod::continuation_for_implicit_exception(address pc) {
2087 // Exception happened outside inline-cache check code => we are inside
2088 // an active nmethod => use cpc to determine a return address
2089 int exception_offset = pc - code_begin();
2090 int cont_offset = ImplicitExceptionTable(this).at( exception_offset );
2091 #ifdef ASSERT
2092 if (cont_offset == 0) {
2093 Thread* thread = Thread::current();
2094 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
2095 HandleMark hm(thread);
2096 ResourceMark rm(thread);
2097 CodeBlob* cb = CodeCache::find_blob(pc);
2098 assert(cb != NULL && cb == this, "");
2099 ttyLocker ttyl;
2100 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, p2i(pc));
2101 print();
2102 method()->print_codes();
2103 print_code();
2104 print_pcs();
2105 }
2106 #endif
2107 if (cont_offset == 0) {
2108 // Let the normal error handling report the exception
2109 return NULL;
2110 }
2111 return code_begin() + cont_offset;
2112 }
2113
2114
2115
2116 void nmethod_init() {
2117 // make sure you didn't forget to adjust the filler fields
2118 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
2119 }
2120
2121
2122 //-------------------------------------------------------------------------------------------
2123
2124
2125 // QQQ might we make this work from a frame??
2126 nmethodLocker::nmethodLocker(address pc) {
2127 CodeBlob* cb = CodeCache::find_blob(pc);
2128 guarantee(cb != NULL && cb->is_compiled(), "bad pc for a nmethod found");
2129 _nm = cb->as_compiled_method();
2130 lock_nmethod(_nm);
2131 }
2132
2133 // Only JvmtiDeferredEvent::compiled_method_unload_event()
2134 // should pass zombie_ok == true.
2135 void nmethodLocker::lock_nmethod(CompiledMethod* cm, bool zombie_ok) {
2136 if (cm == NULL) return;
2137 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method
2138 nmethod* nm = cm->as_nmethod();
2139 Atomic::inc(&nm->_lock_count);
2140 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method");
2141 }
2142
2143 void nmethodLocker::unlock_nmethod(CompiledMethod* cm) {
2144 if (cm == NULL) return;
2145 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method
2146 nmethod* nm = cm->as_nmethod();
2147 Atomic::dec(&nm->_lock_count);
2148 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock");
2149 }
2150
2151
2152 // -----------------------------------------------------------------------------
2153 // Verification
2154
2155 class VerifyOopsClosure: public OopClosure {
2156 nmethod* _nm;
2157 bool _ok;
2158 public:
2159 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
2160 bool ok() { return _ok; }
2161 virtual void do_oop(oop* p) {
2162 if (oopDesc::is_oop_or_null(*p)) return;
2163 if (_ok) {
2164 _nm->print_nmethod(true);
2165 _ok = false;
2166 }
2167 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2168 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2169 }
2170 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2171 };
2172
2173 void nmethod::verify() {
2174
2175 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant
2176 // seems odd.
2177
2178 if (is_zombie() || is_not_entrant() || is_unloaded())
2179 return;
2180
2181 // Make sure all the entry points are correctly aligned for patching.
2182 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
2183
2184 // assert(oopDesc::is_oop(method()), "must be valid");
2185
2186 ResourceMark rm;
2187
2188 if (!CodeCache::contains(this)) {
2189 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this));
2190 }
2191
2192 if(is_native_method() )
2193 return;
2194
2195 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
2196 if (nm != this) {
2197 fatal("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this));
2198 }
2199
2200 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2201 if (! p->verify(this)) {
2202 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this));
2203 }
2204 }
2205
2206 VerifyOopsClosure voc(this);
2207 oops_do(&voc);
2208 assert(voc.ok(), "embedded oops must be OK");
2209 Universe::heap()->verify_nmethod(this);
2210
2211 verify_scopes();
2212 }
2213
2214
2215 void nmethod::verify_interrupt_point(address call_site) {
2216 // Verify IC only when nmethod installation is finished.
2217 if (!is_not_installed()) {
2218 if (CompiledICLocker::is_safe(this)) {
2219 CompiledIC_at(this, call_site);
2220 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
2221 } else {
2222 CompiledICLocker ml_verify(this);
2223 CompiledIC_at(this, call_site);
2224 }
2225 }
2226
2227 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address());
2228 assert(pd != NULL, "PcDesc must exist");
2229 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(),
2230 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(),
2231 pd->return_oop(), pd->return_vt());
2232 !sd->is_top(); sd = sd->sender()) {
2233 sd->verify();
2234 }
2235 }
2236
2237 void nmethod::verify_scopes() {
2238 if( !method() ) return; // Runtime stubs have no scope
2239 if (method()->is_native()) return; // Ignore stub methods.
2240 // iterate through all interrupt point
2241 // and verify the debug information is valid.
2242 RelocIterator iter((nmethod*)this);
2243 while (iter.next()) {
2244 address stub = NULL;
2245 switch (iter.type()) {
2246 case relocInfo::virtual_call_type:
2247 verify_interrupt_point(iter.addr());
2248 break;
2249 case relocInfo::opt_virtual_call_type:
2250 stub = iter.opt_virtual_call_reloc()->static_stub(false);
2251 verify_interrupt_point(iter.addr());
2252 break;
2253 case relocInfo::static_call_type:
2254 stub = iter.static_call_reloc()->static_stub(false);
2255 //verify_interrupt_point(iter.addr());
2256 break;
2257 case relocInfo::runtime_call_type:
2258 case relocInfo::runtime_call_w_cp_type: {
2259 address destination = iter.reloc()->value();
2260 // Right now there is no way to find out which entries support
2261 // an interrupt point. It would be nice if we had this
2262 // information in a table.
2263 break;
2264 }
2265 default:
2266 break;
2267 }
2268 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section");
2269 }
2270 }
2271
2272
2273 // -----------------------------------------------------------------------------
2274 // Non-product code
2275 #ifndef PRODUCT
2276
2277 class DebugScavengeRoot: public OopClosure {
2278 nmethod* _nm;
2279 bool _ok;
2280 public:
2281 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { }
2282 bool ok() { return _ok; }
2283 virtual void do_oop(oop* p) {
2284 if ((*p) == NULL || !Universe::heap()->is_scavengable(*p)) return;
2285 if (_ok) {
2286 _nm->print_nmethod(true);
2287 _ok = false;
2288 }
2289 tty->print_cr("*** scavengable oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2290 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2291 (*p)->print();
2292 }
2293 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2294 };
2295
2296 void nmethod::verify_scavenge_root_oops() {
2297 if (!on_scavenge_root_list()) {
2298 // Actually look inside, to verify the claim that it's clean.
2299 DebugScavengeRoot debug_scavenge_root(this);
2300 oops_do(&debug_scavenge_root);
2301 if (!debug_scavenge_root.ok())
2302 fatal("found an unadvertised bad scavengable oop in the code cache");
2303 }
2304 assert(scavenge_root_not_marked(), "");
2305 }
2306
2307 #endif // PRODUCT
2308
2309 // Printing operations
2310
2311 void nmethod::print() const {
2312 ResourceMark rm;
2313 ttyLocker ttyl; // keep the following output all in one block
2314
2315 tty->print("Compiled method ");
2316
2317 if (is_compiled_by_c1()) {
2318 tty->print("(c1) ");
2319 } else if (is_compiled_by_c2()) {
2320 tty->print("(c2) ");
2321 } else if (is_compiled_by_jvmci()) {
2322 tty->print("(JVMCI) ");
2323 } else {
2324 tty->print("(nm) ");
2325 }
2326
2327 print_on(tty, NULL);
2328
2329 if (WizardMode) {
2330 tty->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this));
2331 tty->print(" for method " INTPTR_FORMAT , p2i(method()));
2332 tty->print(" { ");
2333 tty->print_cr("%s ", state());
2334 if (on_scavenge_root_list()) tty->print("scavenge_root ");
2335 tty->print_cr("}:");
2336 }
2337 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2338 p2i(this),
2339 p2i(this) + size(),
2340 size());
2341 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2342 p2i(relocation_begin()),
2343 p2i(relocation_end()),
2344 relocation_size());
2345 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2346 p2i(consts_begin()),
2347 p2i(consts_end()),
2348 consts_size());
2349 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2350 p2i(insts_begin()),
2351 p2i(insts_end()),
2352 insts_size());
2353 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2354 p2i(stub_begin()),
2355 p2i(stub_end()),
2356 stub_size());
2357 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2358 p2i(oops_begin()),
2359 p2i(oops_end()),
2360 oops_size());
2361 if (metadata_size () > 0) tty->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2362 p2i(metadata_begin()),
2363 p2i(metadata_end()),
2364 metadata_size());
2365 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2366 p2i(scopes_data_begin()),
2367 p2i(scopes_data_end()),
2368 scopes_data_size());
2369 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2370 p2i(scopes_pcs_begin()),
2371 p2i(scopes_pcs_end()),
2372 scopes_pcs_size());
2373 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2374 p2i(dependencies_begin()),
2375 p2i(dependencies_end()),
2376 dependencies_size());
2377 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2378 p2i(handler_table_begin()),
2379 p2i(handler_table_end()),
2380 handler_table_size());
2381 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2382 p2i(nul_chk_table_begin()),
2383 p2i(nul_chk_table_end()),
2384 nul_chk_table_size());
2385 }
2386
2387 #ifndef PRODUCT
2388
2389 void nmethod::print_scopes() {
2390 // Find the first pc desc for all scopes in the code and print it.
2391 ResourceMark rm;
2392 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2393 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
2394 continue;
2395
2396 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
2397 while (sd != NULL) {
2398 sd->print_on(tty, p);
2399 sd = sd->sender();
2400 }
2401 }
2402 }
2403
2404 void nmethod::print_dependencies() {
2405 ResourceMark rm;
2406 ttyLocker ttyl; // keep the following output all in one block
2407 tty->print_cr("Dependencies:");
2408 for (Dependencies::DepStream deps(this); deps.next(); ) {
2409 deps.print_dependency();
2410 Klass* ctxk = deps.context_type();
2411 if (ctxk != NULL) {
2412 if (ctxk->is_instance_klass() && InstanceKlass::cast(ctxk)->is_dependent_nmethod(this)) {
2413 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name());
2414 }
2415 }
2416 deps.log_dependency(); // put it into the xml log also
2417 }
2418 }
2419
2420
2421 void nmethod::print_relocations() {
2422 ResourceMark m; // in case methods get printed via the debugger
2423 tty->print_cr("relocations:");
2424 RelocIterator iter(this);
2425 iter.print();
2426 }
2427
2428
2429 void nmethod::print_pcs() {
2430 ResourceMark m; // in case methods get printed via debugger
2431 tty->print_cr("pc-bytecode offsets:");
2432 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2433 p->print(this);
2434 }
2435 }
2436
2437 void nmethod::print_recorded_oops() {
2438 tty->print_cr("Recorded oops:");
2439 for (int i = 0; i < oops_count(); i++) {
2440 oop o = oop_at(i);
2441 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(o));
2442 if (o == Universe::non_oop_word()) {
2443 tty->print("non-oop word");
2444 } else {
2445 if (o != NULL) {
2446 o->print_value();
2447 } else {
2448 tty->print_cr("NULL");
2449 }
2450 }
2451 tty->cr();
2452 }
2453 }
2454
2455 void nmethod::print_recorded_metadata() {
2456 tty->print_cr("Recorded metadata:");
2457 for (int i = 0; i < metadata_count(); i++) {
2458 Metadata* m = metadata_at(i);
2459 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(m));
2460 if (m == (Metadata*)Universe::non_oop_word()) {
2461 tty->print("non-metadata word");
2462 } else {
2463 Metadata::print_value_on_maybe_null(tty, m);
2464 }
2465 tty->cr();
2466 }
2467 }
2468
2469 #endif // PRODUCT
2470
2471 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
2472 RelocIterator iter(this, begin, end);
2473 bool have_one = false;
2474 while (iter.next()) {
2475 have_one = true;
2476 switch (iter.type()) {
2477 case relocInfo::none: return "no_reloc";
2478 case relocInfo::oop_type: {
2479 stringStream st;
2480 oop_Relocation* r = iter.oop_reloc();
2481 oop obj = r->oop_value();
2482 st.print("oop(");
2483 if (obj == NULL) st.print("NULL");
2484 else obj->print_value_on(&st);
2485 st.print(")");
2486 return st.as_string();
2487 }
2488 case relocInfo::metadata_type: {
2489 stringStream st;
2490 metadata_Relocation* r = iter.metadata_reloc();
2491 Metadata* obj = r->metadata_value();
2492 st.print("metadata(");
2493 if (obj == NULL) st.print("NULL");
2494 else obj->print_value_on(&st);
2495 st.print(")");
2496 return st.as_string();
2497 }
2498 case relocInfo::runtime_call_type:
2499 case relocInfo::runtime_call_w_cp_type: {
2500 stringStream st;
2501 st.print("runtime_call");
2502 CallRelocation* r = (CallRelocation*)iter.reloc();
2503 address dest = r->destination();
2504 CodeBlob* cb = CodeCache::find_blob(dest);
2505 if (cb != NULL) {
2506 st.print(" %s", cb->name());
2507 } else {
2508 ResourceMark rm;
2509 const int buflen = 1024;
2510 char* buf = NEW_RESOURCE_ARRAY(char, buflen);
2511 int offset;
2512 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) {
2513 st.print(" %s", buf);
2514 if (offset != 0) {
2515 st.print("+%d", offset);
2516 }
2517 }
2518 }
2519 return st.as_string();
2520 }
2521 case relocInfo::virtual_call_type: {
2522 stringStream st;
2523 st.print_raw("virtual_call");
2524 virtual_call_Relocation* r = iter.virtual_call_reloc();
2525 Method* m = r->method_value();
2526 if (m != NULL) {
2527 assert(m->is_method(), "");
2528 m->print_short_name(&st);
2529 }
2530 return st.as_string();
2531 }
2532 case relocInfo::opt_virtual_call_type: {
2533 stringStream st;
2534 st.print_raw("optimized virtual_call");
2535 opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc();
2536 Method* m = r->method_value();
2537 if (m != NULL) {
2538 assert(m->is_method(), "");
2539 m->print_short_name(&st);
2540 }
2541 return st.as_string();
2542 }
2543 case relocInfo::static_call_type: {
2544 stringStream st;
2545 st.print_raw("static_call");
2546 static_call_Relocation* r = iter.static_call_reloc();
2547 Method* m = r->method_value();
2548 if (m != NULL) {
2549 assert(m->is_method(), "");
2550 m->print_short_name(&st);
2551 }
2552 return st.as_string();
2553 }
2554 case relocInfo::static_stub_type: return "static_stub";
2555 case relocInfo::external_word_type: return "external_word";
2556 case relocInfo::internal_word_type: return "internal_word";
2557 case relocInfo::section_word_type: return "section_word";
2558 case relocInfo::poll_type: return "poll";
2559 case relocInfo::poll_return_type: return "poll_return";
2560 case relocInfo::trampoline_stub_type: return "trampoline_stub";
2561 case relocInfo::type_mask: return "type_bit_mask";
2562
2563 default:
2564 break;
2565 }
2566 }
2567 return have_one ? "other" : NULL;
2568 }
2569
2570 // Return a the last scope in (begin..end]
2571 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
2572 PcDesc* p = pc_desc_near(begin+1);
2573 if (p != NULL && p->real_pc(this) <= end) {
2574 return new ScopeDesc(this, p->scope_decode_offset(),
2575 p->obj_decode_offset(), p->should_reexecute(), p->rethrow_exception(),
2576 p->return_oop(), p->return_vt());
2577 }
2578 return NULL;
2579 }
2580
2581 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const {
2582 address low = MIN4(entry_point(), verified_entry_point(), verified_value_entry_point(), verified_value_ro_entry_point());
2583 assert(low != 0, "sanity");
2584 if (block_begin == low) {
2585 // Print method arguments before the method entry
2586 methodHandle m = method();
2587 if (m.not_null()) {
2588 stream->print(" # ");
2589 m->print_value_on(stream);
2590 stream->cr();
2591 }
2592 if (m.not_null() && !is_osr_method()) {
2593 ResourceMark rm;
2594 int sizeargs = 0;
2595 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, 256);
2596 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, 256);
2597 Symbol* sig = m->signature();
2598 const GrowableArray<SigEntry>* sig_cc = m->adapter()->get_sig_cc();
2599 if (m->has_scalarized_args()) {
2600 // Use extended signature if value type arguments are passed as fields
2601 assert(sig_cc != NULL, "must have scalarized signature");
2602 sig = SigEntry::create_symbol(sig_cc);
2603 } else if (!m->is_static()) {
2604 sig_bt[sizeargs++] = T_OBJECT; // 'this'
2605 }
2606 for (SignatureStream ss(sig); !ss.at_return_type(); ss.next()) {
2607 BasicType t = ss.type();
2608 sig_bt[sizeargs++] = t;
2609 if (type2size[t] == 2) {
2610 sig_bt[sizeargs++] = T_VOID;
2611 } else {
2612 assert(type2size[t] == 1, "size is 1 or 2");
2613 }
2614 }
2615 const char* spname = "sp"; // make arch-specific?
2616 SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false);
2617 int stack_slot_offset = this->frame_size() * wordSize;
2618 int tab1 = 14, tab2 = 24;
2619 int sig_index = 0;
2620 int sig_index_cc = 0;
2621 int arg_index = ((m->is_static() || m->has_scalarized_args()) ? 0 : -1);
2622 bool did_old_sp = false;
2623 for (SignatureStream ss(sig); !ss.at_return_type(); ) {
2624 bool at_this = (arg_index == -1);
2625 bool at_old_sp = false;
2626 BasicType t = (at_this ? T_OBJECT : ss.type());
2627 assert(t == sig_bt[sig_index], "sigs in sync");
2628 if (at_this) {
2629 stream->print(" # this: ");
2630 } else {
2631 stream->print(" # parm%d: ", arg_index);
2632 }
2633 stream->move_to(tab1);
2634 VMReg fst = regs[sig_index].first();
2635 VMReg snd = regs[sig_index].second();
2636 if (fst->is_reg()) {
2637 stream->print("%s", fst->name());
2638 if (snd->is_valid()) {
2639 stream->print(":%s", snd->name());
2640 }
2641 } else if (fst->is_stack()) {
2642 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
2643 if (offset == stack_slot_offset) at_old_sp = true;
2644 stream->print("[%s+0x%x]", spname, offset);
2645 } else {
2646 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
2647 }
2648 stream->print(" ");
2649 stream->move_to(tab2);
2650 stream->print("= ");
2651 if (at_this) {
2652 m->method_holder()->print_value_on(stream);
2653 } else {
2654 bool did_name = false;
2655 if (!at_this && ss.is_object()) {
2656 Symbol* name = ss.as_symbol_or_null();
2657 if (name != NULL) {
2658 name->print_value_on(stream);
2659 did_name = true;
2660 }
2661 }
2662 if (!did_name)
2663 stream->print("%s", type2name(t));
2664 }
2665 if (m->has_scalarized_args()) {
2666 while (!SigEntry::skip_value_delimiters(sig_cc, sig_index_cc)) {
2667 sig_index_cc++;
2668 }
2669 if (SigEntry::is_reserved_entry(sig_cc, sig_index_cc)) {
2670 stream->print(" [RESERVED]");
2671 }
2672 sig_index_cc += type2size[t];
2673 }
2674 if (at_old_sp) {
2675 stream->print(" (%s of caller)", spname);
2676 did_old_sp = true;
2677 }
2678 stream->cr();
2679 sig_index += type2size[t];
2680 arg_index += 1;
2681 if (!at_this) ss.next();
2682 }
2683 if (!did_old_sp) {
2684 stream->print(" # ");
2685 stream->move_to(tab1);
2686 stream->print("[%s+0x%x]", spname, stack_slot_offset);
2687 stream->print(" (%s of caller)", spname);
2688 stream->cr();
2689 }
2690 }
2691 }
2692
2693 if (block_begin == entry_point()) stream->print_cr("[Entry Point]");
2694 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]");
2695 if (block_begin == verified_value_entry_point()) stream->print_cr("[Verified Value Entry Point]");
2696 if (block_begin == verified_value_ro_entry_point()) stream->print_cr("[Verified Value Entry Point (RO)]");
2697 if (JVMCI_ONLY(_exception_offset >= 0 &&) block_begin == exception_begin()) stream->print_cr("[Exception Handler]");
2698 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]");
2699 if (JVMCI_ONLY(_deopt_handler_begin != NULL &&) block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]");
2700
2701 if (has_method_handle_invokes())
2702 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]");
2703
2704 if (block_begin == consts_begin() && consts_begin() != low) stream->print_cr("[Constants]");
2705 }
2706
2707 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) {
2708 // First, find an oopmap in (begin, end].
2709 // We use the odd half-closed interval so that oop maps and scope descs
2710 // which are tied to the byte after a call are printed with the call itself.
2711 address base = code_begin();
2712 ImmutableOopMapSet* oms = oop_maps();
2713 if (oms != NULL) {
2714 for (int i = 0, imax = oms->count(); i < imax; i++) {
2715 const ImmutableOopMapPair* pair = oms->pair_at(i);
2716 const ImmutableOopMap* om = pair->get_from(oms);
2717 address pc = base + pair->pc_offset();
2718 if (pc > begin) {
2719 if (pc <= end) {
2720 st->move_to(column);
2721 st->print("; ");
2722 om->print_on(st);
2723 }
2724 break;
2725 }
2726 }
2727 }
2728
2729 // Print any debug info present at this pc.
2730 ScopeDesc* sd = scope_desc_in(begin, end);
2731 if (sd != NULL) {
2732 st->move_to(column);
2733 if (sd->bci() == SynchronizationEntryBCI) {
2734 st->print(";*synchronization entry");
2735 } else if (sd->bci() == AfterBci) {
2736 st->print(";* method exit (unlocked if synchronized)");
2737 } else if (sd->bci() == UnwindBci) {
2738 st->print(";* unwind (locked if synchronized)");
2739 } else if (sd->bci() == AfterExceptionBci) {
2740 st->print(";* unwind (unlocked if synchronized)");
2741 } else if (sd->bci() == UnknownBci) {
2742 st->print(";* unknown");
2743 } else if (sd->bci() == InvalidFrameStateBci) {
2744 st->print(";* invalid frame state");
2745 } else {
2746 if (sd->method() == NULL) {
2747 st->print("method is NULL");
2748 } else if (sd->method()->is_native()) {
2749 st->print("method is native");
2750 } else {
2751 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci());
2752 st->print(";*%s", Bytecodes::name(bc));
2753 switch (bc) {
2754 case Bytecodes::_invokevirtual:
2755 case Bytecodes::_invokespecial:
2756 case Bytecodes::_invokestatic:
2757 case Bytecodes::_invokeinterface:
2758 {
2759 Bytecode_invoke invoke(sd->method(), sd->bci());
2760 st->print(" ");
2761 if (invoke.name() != NULL)
2762 invoke.name()->print_symbol_on(st);
2763 else
2764 st->print("<UNKNOWN>");
2765 break;
2766 }
2767 case Bytecodes::_getfield:
2768 case Bytecodes::_putfield:
2769 case Bytecodes::_getstatic:
2770 case Bytecodes::_putstatic:
2771 {
2772 Bytecode_field field(sd->method(), sd->bci());
2773 st->print(" ");
2774 if (field.name() != NULL)
2775 field.name()->print_symbol_on(st);
2776 else
2777 st->print("<UNKNOWN>");
2778 }
2779 default:
2780 break;
2781 }
2782 }
2783 st->print(" {reexecute=%d rethrow=%d return_oop=%d return_vt=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop(), sd->return_vt());
2784 }
2785
2786 // Print all scopes
2787 for (;sd != NULL; sd = sd->sender()) {
2788 st->move_to(column);
2789 st->print("; -");
2790 if (sd->method() == NULL) {
2791 st->print("method is NULL");
2792 } else {
2793 sd->method()->print_short_name(st);
2794 }
2795 int lineno = sd->method()->line_number_from_bci(sd->bci());
2796 if (lineno != -1) {
2797 st->print("@%d (line %d)", sd->bci(), lineno);
2798 } else {
2799 st->print("@%d", sd->bci());
2800 }
2801 st->cr();
2802 }
2803 }
2804
2805 // Print relocation information
2806 const char* str = reloc_string_for(begin, end);
2807 if (str != NULL) {
2808 if (sd != NULL) st->cr();
2809 st->move_to(column);
2810 st->print("; {%s}", str);
2811 }
2812 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin());
2813 if (cont_offset != 0) {
2814 st->move_to(column);
2815 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset));
2816 }
2817
2818 }
2819
2820 class DirectNativeCallWrapper: public NativeCallWrapper {
2821 private:
2822 NativeCall* _call;
2823
2824 public:
2825 DirectNativeCallWrapper(NativeCall* call) : _call(call) {}
2826
2827 virtual address destination() const { return _call->destination(); }
2828 virtual address instruction_address() const { return _call->instruction_address(); }
2829 virtual address next_instruction_address() const { return _call->next_instruction_address(); }
2830 virtual address return_address() const { return _call->return_address(); }
2831
2832 virtual address get_resolve_call_stub(bool is_optimized) const {
2833 if (is_optimized) {
2834 return SharedRuntime::get_resolve_opt_virtual_call_stub();
2835 }
2836 return SharedRuntime::get_resolve_virtual_call_stub();
2837 }
2838
2839 virtual void set_destination_mt_safe(address dest) {
2840 #if INCLUDE_AOT
2841 if (UseAOT) {
2842 CodeBlob* callee = CodeCache::find_blob(dest);
2843 CompiledMethod* cm = callee->as_compiled_method_or_null();
2844 if (cm != NULL && cm->is_far_code()) {
2845 // Temporary fix, see JDK-8143106
2846 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address());
2847 csc->set_to_far(methodHandle(cm->method()), dest);
2848 return;
2849 }
2850 }
2851 #endif
2852 _call->set_destination_mt_safe(dest);
2853 }
2854
2855 virtual void set_to_interpreted(const methodHandle& method, CompiledICInfo& info) {
2856 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address());
2857 #if INCLUDE_AOT
2858 if (info.to_aot()) {
2859 csc->set_to_far(method, info.entry());
2860 } else
2861 #endif
2862 {
2863 csc->set_to_interpreted(method, info.entry());
2864 }
2865 }
2866
2867 virtual void verify() const {
2868 // make sure code pattern is actually a call imm32 instruction
2869 _call->verify();
2870 _call->verify_alignment();
2871 }
2872
2873 virtual void verify_resolve_call(address dest) const {
2874 CodeBlob* db = CodeCache::find_blob_unsafe(dest);
2875 assert(db != NULL && !db->is_adapter_blob(), "must use stub!");
2876 }
2877
2878 virtual bool is_call_to_interpreted(address dest) const {
2879 CodeBlob* cb = CodeCache::find_blob(_call->instruction_address());
2880 return cb->contains(dest);
2881 }
2882
2883 virtual bool is_safe_for_patching() const { return false; }
2884
2885 virtual NativeInstruction* get_load_instruction(virtual_call_Relocation* r) const {
2886 return nativeMovConstReg_at(r->cached_value());
2887 }
2888
2889 virtual void *get_data(NativeInstruction* instruction) const {
2890 return (void*)((NativeMovConstReg*) instruction)->data();
2891 }
2892
2893 virtual void set_data(NativeInstruction* instruction, intptr_t data) {
2894 ((NativeMovConstReg*) instruction)->set_data(data);
2895 }
2896 };
2897
2898 NativeCallWrapper* nmethod::call_wrapper_at(address call) const {
2899 return new DirectNativeCallWrapper((NativeCall*) call);
2900 }
2901
2902 NativeCallWrapper* nmethod::call_wrapper_before(address return_pc) const {
2903 return new DirectNativeCallWrapper(nativeCall_before(return_pc));
2904 }
2905
2906 address nmethod::call_instruction_address(address pc) const {
2907 if (NativeCall::is_call_before(pc)) {
2908 NativeCall *ncall = nativeCall_before(pc);
2909 return ncall->instruction_address();
2910 }
2911 return NULL;
2912 }
2913
2914 CompiledStaticCall* nmethod::compiledStaticCall_at(Relocation* call_site) const {
2915 return CompiledDirectStaticCall::at(call_site);
2916 }
2917
2918 CompiledStaticCall* nmethod::compiledStaticCall_at(address call_site) const {
2919 return CompiledDirectStaticCall::at(call_site);
2920 }
2921
2922 CompiledStaticCall* nmethod::compiledStaticCall_before(address return_addr) const {
2923 return CompiledDirectStaticCall::before(return_addr);
2924 }
2925
2926 #ifndef PRODUCT
2927
2928 void nmethod::print_value_on(outputStream* st) const {
2929 st->print("nmethod");
2930 print_on(st, NULL);
2931 }
2932
2933 void nmethod::print_calls(outputStream* st) {
2934 RelocIterator iter(this);
2935 while (iter.next()) {
2936 switch (iter.type()) {
2937 case relocInfo::virtual_call_type:
2938 case relocInfo::opt_virtual_call_type: {
2939 CompiledICLocker ml_verify(this);
2940 CompiledIC_at(&iter)->print();
2941 break;
2942 }
2943 case relocInfo::static_call_type:
2944 st->print_cr("Static call at " INTPTR_FORMAT, p2i(iter.reloc()->addr()));
2945 CompiledDirectStaticCall::at(iter.reloc())->print();
2946 break;
2947 default:
2948 break;
2949 }
2950 }
2951 }
2952
2953 void nmethod::print_handler_table() {
2954 ExceptionHandlerTable(this).print();
2955 }
2956
2957 void nmethod::print_nul_chk_table() {
2958 ImplicitExceptionTable(this).print(code_begin());
2959 }
2960
2961 void nmethod::print_statistics() {
2962 ttyLocker ttyl;
2963 if (xtty != NULL) xtty->head("statistics type='nmethod'");
2964 native_nmethod_stats.print_native_nmethod_stats();
2965 #ifdef COMPILER1
2966 c1_java_nmethod_stats.print_nmethod_stats("C1");
2967 #endif
2968 #ifdef COMPILER2
2969 c2_java_nmethod_stats.print_nmethod_stats("C2");
2970 #endif
2971 #if INCLUDE_JVMCI
2972 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI");
2973 #endif
2974 unknown_java_nmethod_stats.print_nmethod_stats("Unknown");
2975 DebugInformationRecorder::print_statistics();
2976 #ifndef PRODUCT
2977 pc_nmethod_stats.print_pc_stats();
2978 #endif
2979 Dependencies::print_statistics();
2980 if (xtty != NULL) xtty->tail("statistics");
2981 }
2982
2983 #endif // !PRODUCT
2984
2985 #if INCLUDE_JVMCI
2986 void nmethod::clear_jvmci_installed_code() {
2987 assert_locked_or_safepoint(Patching_lock);
2988 if (_jvmci_installed_code != NULL) {
2989 JNIHandles::destroy_weak_global(_jvmci_installed_code);
2990 _jvmci_installed_code = NULL;
2991 }
2992 }
2993
2994 void nmethod::clear_speculation_log() {
2995 assert_locked_or_safepoint(Patching_lock);
2996 if (_speculation_log != NULL) {
2997 JNIHandles::destroy_weak_global(_speculation_log);
2998 _speculation_log = NULL;
2999 }
3000 }
3001
3002 void nmethod::maybe_invalidate_installed_code() {
3003 if (!is_compiled_by_jvmci()) {
3004 return;
3005 }
3006
3007 assert(Patching_lock->is_locked() ||
3008 SafepointSynchronize::is_at_safepoint(), "should be performed under a lock for consistency");
3009 oop installed_code = JNIHandles::resolve(_jvmci_installed_code);
3010 if (installed_code != NULL) {
3011 // Update the values in the InstalledCode instance if it still refers to this nmethod
3012 nmethod* nm = (nmethod*)InstalledCode::address(installed_code);
3013 if (nm == this) {
3014 if (!is_alive() || is_unloading()) {
3015 // Break the link between nmethod and InstalledCode such that the nmethod
3016 // can subsequently be flushed safely. The link must be maintained while
3017 // the method could have live activations since invalidateInstalledCode
3018 // might want to invalidate all existing activations.
3019 InstalledCode::set_address(installed_code, 0);
3020 InstalledCode::set_entryPoint(installed_code, 0);
3021 } else if (is_not_entrant()) {
3022 // Remove the entry point so any invocation will fail but keep
3023 // the address link around that so that existing activations can
3024 // be invalidated.
3025 InstalledCode::set_entryPoint(installed_code, 0);
3026 }
3027 }
3028 }
3029 if (!is_alive() || is_unloading()) {
3030 // Clear these out after the nmethod has been unregistered and any
3031 // updates to the InstalledCode instance have been performed.
3032 clear_jvmci_installed_code();
3033 clear_speculation_log();
3034 }
3035 }
3036
3037 void nmethod::invalidate_installed_code(Handle installedCode, TRAPS) {
3038 if (installedCode() == NULL) {
3039 THROW(vmSymbols::java_lang_NullPointerException());
3040 }
3041 jlong nativeMethod = InstalledCode::address(installedCode);
3042 nmethod* nm = (nmethod*)nativeMethod;
3043 if (nm == NULL) {
3044 // Nothing to do
3045 return;
3046 }
3047
3048 nmethodLocker nml(nm);
3049 #ifdef ASSERT
3050 {
3051 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
3052 // This relationship can only be checked safely under a lock
3053 assert(!nm->is_alive() || nm->is_unloading() || nm->jvmci_installed_code() == installedCode(), "sanity check");
3054 }
3055 #endif
3056
3057 if (nm->is_alive()) {
3058 // Invalidating the InstalledCode means we want the nmethod
3059 // to be deoptimized.
3060 nm->mark_for_deoptimization();
3061 VM_Deoptimize op;
3062 VMThread::execute(&op);
3063 }
3064
3065 // Multiple threads could reach this point so we now need to
3066 // lock and re-check the link to the nmethod so that only one
3067 // thread clears it.
3068 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
3069 if (InstalledCode::address(installedCode) == nativeMethod) {
3070 InstalledCode::set_address(installedCode, 0);
3071 }
3072 }
3073
3074 oop nmethod::jvmci_installed_code() {
3075 return JNIHandles::resolve(_jvmci_installed_code);
3076 }
3077
3078 oop nmethod::speculation_log() {
3079 return JNIHandles::resolve(_speculation_log);
3080 }
3081
3082 char* nmethod::jvmci_installed_code_name(char* buf, size_t buflen) const {
3083 if (!this->is_compiled_by_jvmci()) {
3084 return NULL;
3085 }
3086 oop installed_code = JNIHandles::resolve(_jvmci_installed_code);
3087 if (installed_code != NULL) {
3088 oop installed_code_name = NULL;
3089 if (installed_code->is_a(InstalledCode::klass())) {
3090 installed_code_name = InstalledCode::name(installed_code);
3091 }
3092 if (installed_code_name != NULL) {
3093 return java_lang_String::as_utf8_string(installed_code_name, buf, (int)buflen);
3094 }
3095 }
3096 return NULL;
3097 }
3098 #endif