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