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