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() || Thread::current()->is_ConcurrentGC_thread(),
1057 "should only be called during gc");
1058 flush_dependencies(/*delete_immediately*/false);
1059
1060 // Break cycle between nmethod & method
1061 LogTarget(Trace, class, unload, nmethod) lt;
1062 if (lt.is_enabled()) {
1063 LogStream ls(lt);
1064 ls.print("making nmethod " INTPTR_FORMAT
1065 " unloadable, Method*(" INTPTR_FORMAT
1066 ") ",
1067 p2i(this), p2i(_method));
1068 ls.cr();
1069 }
1070 // Unlink the osr method, so we do not look this up again
1071 if (is_osr_method()) {
1072 // Invalidate the osr nmethod only once
1073 if (is_in_use()) {
1074 invalidate_osr_method();
1075 }
1076 #ifdef ASSERT
1077 if (method() != NULL) {
1078 // Make sure osr nmethod is invalidated, i.e. not on the list
1079 bool found = method()->method_holder()->remove_osr_nmethod(this);
1080 assert(!found, "osr nmethod should have been invalidated");
1081 }
1082 #endif
1083 }
1084
1085 // If _method is already NULL the Method* is about to be unloaded,
1086 // so we don't have to break the cycle. Note that it is possible to
1087 // have the Method* live here, in case we unload the nmethod because
1088 // it is pointing to some oop (other than the Method*) being unloaded.
1089 if (_method != NULL) {
1090 // OSR methods point to the Method*, but the Method* does not
1091 // point back!
1092 if (_method->code() == this) {
1093 _method->clear_code(); // Break a cycle
1094 }
1095 _method = NULL; // Clear the method of this dead nmethod
1096 }
1097
1098 // Make the class unloaded - i.e., change state and notify sweeper
1099 assert(SafepointSynchronize::is_at_safepoint() || Thread::current()->is_ConcurrentGC_thread(),
1100 "must be at safepoint");
1101
1102 // Unregister must be done before the state change
1103 Universe::heap()->unregister_nmethod(this);
1104
1105 // Log the unloading.
1106 log_state_change();
1107
1108 #if INCLUDE_JVMCI
1109 // The method can only be unloaded after the pointer to the installed code
1110 // Java wrapper is no longer alive. Here we need to clear out this weak
1111 // reference to the dead object.
1112 maybe_invalidate_installed_code();
1113 #endif
1114
1115 // The Method* is gone at this point
1116 assert(_method == NULL, "Tautology");
1117
1118 set_osr_link(NULL);
1119 NMethodSweeper::report_state_change(this);
1120
1121 // The release is only needed for compile-time ordering, as accesses
1122 // into the nmethod after the store are not safe due to the sweeper
1123 // being allowed to free it when the store is observed, during
1124 // concurrent nmethod unloading. Therefore, there is no need for
1125 // acquire on the loader side.
1126 OrderAccess::release_store(&_state, (signed char)unloaded);
1127 }
1128
1129 void nmethod::invalidate_osr_method() {
1130 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
1131 // Remove from list of active nmethods
1132 if (method() != NULL) {
1133 method()->method_holder()->remove_osr_nmethod(this);
1134 }
1135 }
1136
1137 void nmethod::log_state_change() const {
1138 if (LogCompilation) {
1139 if (xtty != NULL) {
1140 ttyLocker ttyl; // keep the following output all in one block
1141 if (_state == unloaded) {
1142 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'",
1143 os::current_thread_id());
1144 } else {
1145 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s",
1146 os::current_thread_id(),
1147 (_state == zombie ? " zombie='1'" : ""));
1148 }
1149 log_identity(xtty);
1150 xtty->stamp();
1151 xtty->end_elem();
1152 }
1153 }
1154
1155 const char *state_msg = _state == zombie ? "made zombie" : "made not entrant";
1156 CompileTask::print_ul(this, state_msg);
1157 if (PrintCompilation && _state != unloaded) {
1158 print_on(tty, state_msg);
1159 }
1160 }
1161
1162 /**
1163 * Common functionality for both make_not_entrant and make_zombie
1164 */
1165 bool nmethod::make_not_entrant_or_zombie(int state) {
1166 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant");
1167 assert(!is_zombie(), "should not already be a zombie");
1168
1169 if (_state == state) {
1170 // Avoid taking the lock if already in required state.
1171 // This is safe from races because the state is an end-state,
1172 // which the nmethod cannot back out of once entered.
1173 // No need for fencing either.
1174 return false;
1175 }
1176
1177 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below.
1178 nmethodLocker nml(this);
1179 methodHandle the_method(method());
1180 // This can be called while the system is already at a safepoint which is ok
1181 NoSafepointVerifier nsv(true, !SafepointSynchronize::is_at_safepoint());
1182
1183 // during patching, depending on the nmethod state we must notify the GC that
1184 // code has been unloaded, unregistering it. We cannot do this right while
1185 // holding the Patching_lock because we need to use the CodeCache_lock. This
1186 // would be prone to deadlocks.
1187 // This flag is used to remember whether we need to later lock and unregister.
1188 bool nmethod_needs_unregister = false;
1189
1190 {
1191 // invalidate osr nmethod before acquiring the patching lock since
1192 // they both acquire leaf locks and we don't want a deadlock.
1193 // This logic is equivalent to the logic below for patching the
1194 // verified entry point of regular methods. We check that the
1195 // nmethod is in use to ensure that it is invalidated only once.
1196 if (is_osr_method() && is_in_use()) {
1197 // this effectively makes the osr nmethod not entrant
1198 invalidate_osr_method();
1199 }
1200
1201 // Enter critical section. Does not block for safepoint.
1202 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1203
1204 if (_state == state) {
1205 // another thread already performed this transition so nothing
1206 // to do, but return false to indicate this.
1207 return false;
1208 }
1209
1210 // The caller can be calling the method statically or through an inline
1211 // cache call.
1212 if (!is_osr_method() && !is_not_entrant()) {
1213 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
1214 SharedRuntime::get_handle_wrong_method_stub());
1215 }
1216
1217 if (is_in_use() && update_recompile_counts()) {
1218 // It's a true state change, so mark the method as decompiled.
1219 // Do it only for transition from alive.
1220 inc_decompile_count();
1221 }
1222
1223 // If the state is becoming a zombie, signal to unregister the nmethod with
1224 // the heap.
1225 // This nmethod may have already been unloaded during a full GC.
1226 if ((state == zombie) && !is_unloaded()) {
1227 nmethod_needs_unregister = true;
1228 }
1229
1230 // Must happen before state change. Otherwise we have a race condition in
1231 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately
1232 // transition its state from 'not_entrant' to 'zombie' without having to wait
1233 // for stack scanning.
1234 if (state == not_entrant) {
1235 mark_as_seen_on_stack();
1236 OrderAccess::storestore(); // _stack_traversal_mark and _state
1237 }
1238
1239 // Change state
1240 _state = state;
1241
1242 // Log the transition once
1243 log_state_change();
1244
1245 // Invalidate while holding the patching lock
1246 JVMCI_ONLY(maybe_invalidate_installed_code());
1247
1248 // Remove nmethod from method.
1249 // We need to check if both the _code and _from_compiled_code_entry_point
1250 // refer to this nmethod because there is a race in setting these two fields
1251 // in Method* as seen in bugid 4947125.
1252 // If the vep() points to the zombie nmethod, the memory for the nmethod
1253 // could be flushed and the compiler and vtable stubs could still call
1254 // through it.
1255 if (method() != NULL && (method()->code() == this ||
1256 method()->from_compiled_entry() == verified_entry_point())) {
1257 HandleMark hm;
1258 method()->clear_code(false /* already owns Patching_lock */);
1259 }
1260 } // leave critical region under Patching_lock
1261
1262 #ifdef ASSERT
1263 if (is_osr_method() && method() != NULL) {
1264 // Make sure osr nmethod is invalidated, i.e. not on the list
1265 bool found = method()->method_holder()->remove_osr_nmethod(this);
1266 assert(!found, "osr nmethod should have been invalidated");
1267 }
1268 #endif
1269
1270 // When the nmethod becomes zombie it is no longer alive so the
1271 // dependencies must be flushed. nmethods in the not_entrant
1272 // state will be flushed later when the transition to zombie
1273 // happens or they get unloaded.
1274 if (state == zombie) {
1275 {
1276 // Flushing dependencies must be done before any possible
1277 // safepoint can sneak in, otherwise the oops used by the
1278 // dependency logic could have become stale.
1279 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1280 if (nmethod_needs_unregister) {
1281 Universe::heap()->unregister_nmethod(this);
1282 }
1283 flush_dependencies(/*delete_immediately*/true);
1284 }
1285
1286 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload
1287 // event and it hasn't already been reported for this nmethod then
1288 // report it now. The event may have been reported earlier if the GC
1289 // marked it for unloading). JvmtiDeferredEventQueue support means
1290 // we no longer go to a safepoint here.
1291 post_compiled_method_unload();
1292
1293 #ifdef ASSERT
1294 // It's no longer safe to access the oops section since zombie
1295 // nmethods aren't scanned for GC.
1296 _oops_are_stale = true;
1297 #endif
1298 // the Method may be reclaimed by class unloading now that the
1299 // nmethod is in zombie state
1300 set_method(NULL);
1301 } else {
1302 assert(state == not_entrant, "other cases may need to be handled differently");
1303 }
1304
1305 if (TraceCreateZombies) {
1306 ResourceMark m;
1307 tty->print_cr("nmethod <" INTPTR_FORMAT "> %s code made %s", p2i(this), this->method() ? this->method()->name_and_sig_as_C_string() : "null", (state == not_entrant) ? "not entrant" : "zombie");
1308 }
1309
1310 NMethodSweeper::report_state_change(this);
1311 return true;
1312 }
1313
1314 void nmethod::flush() {
1315 // Note that there are no valid oops in the nmethod anymore.
1316 assert(!is_osr_method() || is_unloaded() || is_zombie(),
1317 "osr nmethod must be unloaded or zombie before flushing");
1318 assert(is_zombie() || is_osr_method(), "must be a zombie method");
1319 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed");
1320 assert_locked_or_safepoint(CodeCache_lock);
1321
1322 // completely deallocate this method
1323 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, p2i(this));
1324 if (PrintMethodFlushing) {
1325 tty->print_cr("*flushing %s nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT
1326 "/Free CodeCache:" SIZE_FORMAT "Kb",
1327 is_osr_method() ? "osr" : "",_compile_id, p2i(this), CodeCache::blob_count(),
1328 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024);
1329 }
1330
1331 // We need to deallocate any ExceptionCache data.
1332 // Note that we do not need to grab the nmethod lock for this, it
1333 // better be thread safe if we're disposing of it!
1334 ExceptionCache* ec = exception_cache();
1335 set_exception_cache(NULL);
1336 while(ec != NULL) {
1337 ExceptionCache* next = ec->next();
1338 delete ec;
1339 ec = next;
1340 }
1341
1342 if (on_scavenge_root_list()) {
1343 CodeCache::drop_scavenge_root_nmethod(this);
1344 }
1345
1346 #if INCLUDE_JVMCI
1347 assert(_jvmci_installed_code == NULL, "should have been nulled out when transitioned to zombie");
1348 assert(_speculation_log == NULL, "should have been nulled out when transitioned to zombie");
1349 #endif
1350
1351 CodeBlob::flush();
1352 CodeCache::free(this);
1353 }
1354
1355 oop nmethod::oop_at(int index) const {
1356 if (index == 0) {
1357 return NULL;
1358 }
1359 return NativeAccess<AS_NO_KEEPALIVE>::oop_load(oop_addr_at(index));
1360 }
1361
1362 //
1363 // Notify all classes this nmethod is dependent on that it is no
1364 // longer dependent. This should only be called in two situations.
1365 // First, when a nmethod transitions to a zombie all dependents need
1366 // to be clear. Since zombification happens at a safepoint there's no
1367 // synchronization issues. The second place is a little more tricky.
1368 // During phase 1 of mark sweep class unloading may happen and as a
1369 // result some nmethods may get unloaded. In this case the flushing
1370 // of dependencies must happen during phase 1 since after GC any
1371 // dependencies in the unloaded nmethod won't be updated, so
1372 // traversing the dependency information in unsafe. In that case this
1373 // function is called with a boolean argument and this function only
1374 // notifies instanceKlasses that are reachable
1375
1376 void nmethod::flush_dependencies(bool delete_immediately) {
1377 DEBUG_ONLY(bool called_by_gc = Universe::heap()->is_gc_active() || Thread::current()->is_ConcurrentGC_thread();)
1378 assert(called_by_gc != delete_immediately,
1379 "delete_immediately is false if and only if we are called during GC");
1380 if (!has_flushed_dependencies()) {
1381 set_has_flushed_dependencies();
1382 for (Dependencies::DepStream deps(this); deps.next(); ) {
1383 if (deps.type() == Dependencies::call_site_target_value) {
1384 // CallSite dependencies are managed on per-CallSite instance basis.
1385 oop call_site = deps.argument_oop(0);
1386 if (delete_immediately) {
1387 assert_locked_or_safepoint(CodeCache_lock);
1388 MethodHandles::remove_dependent_nmethod(call_site, this);
1389 } else {
1390 MethodHandles::clean_dependency_context(call_site);
1391 }
1392 } else {
1393 Klass* klass = deps.context_type();
1394 if (klass == NULL) {
1395 continue; // ignore things like evol_method
1396 }
1397 // During GC delete_immediately is false, and liveness
1398 // of dependee determines class that needs to be updated.
1399 if (delete_immediately) {
1400 assert_locked_or_safepoint(CodeCache_lock);
1401 InstanceKlass::cast(klass)->remove_dependent_nmethod(this);
1402 } else if (klass->is_loader_alive()) {
1403 // The GC may clean dependency contexts concurrently and in parallel.
1404 InstanceKlass::cast(klass)->clean_dependency_context();
1405 }
1406 }
1407 }
1408 }
1409 }
1410
1411 // ------------------------------------------------------------------
1412 // post_compiled_method_load_event
1413 // new method for install_code() path
1414 // Transfer information from compilation to jvmti
1415 void nmethod::post_compiled_method_load_event() {
1416
1417 Method* moop = method();
1418 HOTSPOT_COMPILED_METHOD_LOAD(
1419 (char *) moop->klass_name()->bytes(),
1420 moop->klass_name()->utf8_length(),
1421 (char *) moop->name()->bytes(),
1422 moop->name()->utf8_length(),
1423 (char *) moop->signature()->bytes(),
1424 moop->signature()->utf8_length(),
1425 insts_begin(), insts_size());
1426
1427 if (JvmtiExport::should_post_compiled_method_load() ||
1428 JvmtiExport::should_post_compiled_method_unload()) {
1429 get_and_cache_jmethod_id();
1430 }
1431
1432 if (JvmtiExport::should_post_compiled_method_load()) {
1433 // Let the Service thread (which is a real Java thread) post the event
1434 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1435 JvmtiDeferredEventQueue::enqueue(
1436 JvmtiDeferredEvent::compiled_method_load_event(this));
1437 }
1438 }
1439
1440 jmethodID nmethod::get_and_cache_jmethod_id() {
1441 if (_jmethod_id == NULL) {
1442 // Cache the jmethod_id since it can no longer be looked up once the
1443 // method itself has been marked for unloading.
1444 _jmethod_id = method()->jmethod_id();
1445 }
1446 return _jmethod_id;
1447 }
1448
1449 void nmethod::post_compiled_method_unload() {
1450 if (unload_reported()) {
1451 // During unloading we transition to unloaded and then to zombie
1452 // and the unloading is reported during the first transition.
1453 return;
1454 }
1455
1456 assert(_method != NULL && !is_unloaded(), "just checking");
1457 DTRACE_METHOD_UNLOAD_PROBE(method());
1458
1459 // If a JVMTI agent has enabled the CompiledMethodUnload event then
1460 // post the event. Sometime later this nmethod will be made a zombie
1461 // by the sweeper but the Method* will not be valid at that point.
1462 // If the _jmethod_id is null then no load event was ever requested
1463 // so don't bother posting the unload. The main reason for this is
1464 // that the jmethodID is a weak reference to the Method* so if
1465 // it's being unloaded there's no way to look it up since the weak
1466 // ref will have been cleared.
1467 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) {
1468 assert(!unload_reported(), "already unloaded");
1469 JvmtiDeferredEvent event =
1470 JvmtiDeferredEvent::compiled_method_unload_event(this,
1471 _jmethod_id, insts_begin());
1472 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1473 JvmtiDeferredEventQueue::enqueue(event);
1474 }
1475
1476 // The JVMTI CompiledMethodUnload event can be enabled or disabled at
1477 // any time. As the nmethod is being unloaded now we mark it has
1478 // having the unload event reported - this will ensure that we don't
1479 // attempt to report the event in the unlikely scenario where the
1480 // event is enabled at the time the nmethod is made a zombie.
1481 set_unload_reported();
1482 }
1483
1484 // Iterate over metadata calling this function. Used by RedefineClasses
1485 void nmethod::metadata_do(void f(Metadata*)) {
1486 {
1487 // Visit all immediate references that are embedded in the instruction stream.
1488 RelocIterator iter(this, oops_reloc_begin());
1489 while (iter.next()) {
1490 if (iter.type() == relocInfo::metadata_type ) {
1491 metadata_Relocation* r = iter.metadata_reloc();
1492 // In this metadata, we must only follow those metadatas directly embedded in
1493 // the code. Other metadatas (oop_index>0) are seen as part of
1494 // the metadata section below.
1495 assert(1 == (r->metadata_is_immediate()) +
1496 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
1497 "metadata must be found in exactly one place");
1498 if (r->metadata_is_immediate() && r->metadata_value() != NULL) {
1499 Metadata* md = r->metadata_value();
1500 if (md != _method) f(md);
1501 }
1502 } else if (iter.type() == relocInfo::virtual_call_type) {
1503 // Check compiledIC holders associated with this nmethod
1504 ResourceMark rm;
1505 CompiledIC *ic = CompiledIC_at(&iter);
1506 if (ic->is_icholder_call()) {
1507 CompiledICHolder* cichk = ic->cached_icholder();
1508 f(cichk->holder_metadata());
1509 f(cichk->holder_klass());
1510 } else {
1511 Metadata* ic_oop = ic->cached_metadata();
1512 if (ic_oop != NULL) {
1513 f(ic_oop);
1514 }
1515 }
1516 }
1517 }
1518 }
1519
1520 // Visit the metadata section
1521 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
1522 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops
1523 Metadata* md = *p;
1524 f(md);
1525 }
1526
1527 // Visit metadata not embedded in the other places.
1528 if (_method != NULL) f(_method);
1529 }
1530
1531 // The _is_unloading_state encodes a tuple comprising the unloading cycle
1532 // and the result of IsUnloadingBehaviour::is_unloading() fpr that cycle.
1533 // This is the bit layout of the _is_unloading_state byte: 00000CCU
1534 // CC refers to the cycle, which has 2 bits, and U refers to the result of
1535 // IsUnloadingBehaviour::is_unloading() for that unloading cycle.
1536
1537 class IsUnloadingState: public AllStatic {
1538 static const uint8_t _is_unloading_mask = 1;
1539 static const uint8_t _is_unloading_shift = 0;
1540 static const uint8_t _unloading_cycle_mask = 6;
1541 static const uint8_t _unloading_cycle_shift = 1;
1542
1543 static uint8_t set_is_unloading(uint8_t state, bool value) {
1544 state &= ~_is_unloading_mask;
1545 if (value) {
1546 state |= 1 << _is_unloading_shift;
1547 }
1548 assert(is_unloading(state) == value, "unexpected unloading cycle overflow");
1549 return state;
1550 }
1551
1552 static uint8_t set_unloading_cycle(uint8_t state, uint8_t value) {
1553 state &= ~_unloading_cycle_mask;
1554 state |= value << _unloading_cycle_shift;
1555 assert(unloading_cycle(state) == value, "unexpected unloading cycle overflow");
1556 return state;
1557 }
1558
1559 public:
1560 static bool is_unloading(uint8_t state) { return (state & _is_unloading_mask) >> _is_unloading_shift == 1; }
1561 static uint8_t unloading_cycle(uint8_t state) { return (state & _unloading_cycle_mask) >> _unloading_cycle_shift; }
1562
1563 static uint8_t create(bool is_unloading, uint8_t unloading_cycle) {
1564 uint8_t state = 0;
1565 state = set_is_unloading(state, is_unloading);
1566 state = set_unloading_cycle(state, unloading_cycle);
1567 return state;
1568 }
1569 };
1570
1571 bool nmethod::is_unloading() {
1572 uint8_t state = RawAccess<MO_RELAXED>::load(&_is_unloading_state);
1573 bool state_is_unloading = IsUnloadingState::is_unloading(state);
1574 uint8_t state_unloading_cycle = IsUnloadingState::unloading_cycle(state);
1575 if (state_is_unloading) {
1576 return true;
1577 }
1578 uint8_t current_cycle = CodeCache::unloading_cycle();
1579 if (state_unloading_cycle == current_cycle) {
1580 return false;
1581 }
1582
1583 // The IsUnloadingBehaviour is responsible for checking if there are any dead
1584 // oops in the CompiledMethod, by calling oops_do on it.
1585 state_unloading_cycle = current_cycle;
1586
1587 if (is_zombie()) {
1588 // Zombies without calculated unloading epoch are never unloading due to GC.
1589
1590 // There are no races where a previously observed is_unloading() nmethod
1591 // suddenly becomes not is_unloading() due to here being observed as zombie.
1592
1593 // With STW unloading, all is_alive() && is_unloading() nmethods are unlinked
1594 // and unloaded in the safepoint. That makes races where an nmethod is first
1595 // observed as is_alive() && is_unloading() and subsequently observed as
1596 // is_zombie() impossible.
1597
1598 // With concurrent unloading, all references to is_unloading() nmethods are
1599 // first unlinked (e.g. IC caches and dependency contexts). Then a global
1600 // handshake operation is performed with all JavaThreads before finally
1601 // unloading the nmethods. The sweeper never converts is_alive() && is_unloading()
1602 // nmethods to zombies; it waits for them to become is_unloaded(). So before
1603 // the global handshake, it is impossible for is_unloading() nmethods to
1604 // racingly become is_zombie(). And is_unloading() is calculated for all is_alive()
1605 // nmethods before taking that global handshake, meaning that it will never
1606 // be recalculated after the handshake.
1607
1608 // After that global handshake, is_unloading() nmethods are only observable
1609 // to the iterators, and they will never trigger recomputation of the cached
1610 // is_unloading_state, and hence may not suffer from such races.
1611
1612 state_is_unloading = false;
1613 } else {
1614 state_is_unloading = IsUnloadingBehaviour::current()->is_unloading(this);
1615 }
1616
1617 state = IsUnloadingState::create(state_is_unloading, state_unloading_cycle);
1618
1619 RawAccess<MO_RELAXED>::store(&_is_unloading_state, state);
1620
1621 return state_is_unloading;
1622 }
1623
1624 void nmethod::clear_unloading_state() {
1625 uint8_t state = IsUnloadingState::create(false, CodeCache::unloading_cycle());
1626 RawAccess<MO_RELAXED>::store(&_is_unloading_state, state);
1627 }
1628
1629
1630 // This is called at the end of the strong tracing/marking phase of a
1631 // GC to unload an nmethod if it contains otherwise unreachable
1632 // oops.
1633
1634 void nmethod::do_unloading(bool unloading_occurred) {
1635 // Make sure the oop's ready to receive visitors
1636 assert(!is_zombie() && !is_unloaded(),
1637 "should not call follow on zombie or unloaded nmethod");
1638
1639 if (is_unloading()) {
1640 make_unloaded();
1641 } else {
1642 #if INCLUDE_JVMCI
1643 if (_jvmci_installed_code != NULL) {
1644 if (JNIHandles::is_global_weak_cleared(_jvmci_installed_code)) {
1645 if (_jvmci_installed_code_triggers_invalidation) {
1646 make_not_entrant();
1647 }
1648 clear_jvmci_installed_code();
1649 }
1650 }
1651 #endif
1652
1653 guarantee(unload_nmethod_caches(unloading_occurred),
1654 "Should not need transition stubs");
1655 }
1656 }
1657
1658 void nmethod::oops_do(OopClosure* f, bool allow_zombie) {
1659 // make sure the oops ready to receive visitors
1660 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod");
1661 assert(!is_unloaded(), "should not call follow on unloaded nmethod");
1662
1663 // Prevent extra code cache walk for platforms that don't have immediate oops.
1664 if (relocInfo::mustIterateImmediateOopsInCode()) {
1665 RelocIterator iter(this, oops_reloc_begin());
1666
1667 while (iter.next()) {
1668 if (iter.type() == relocInfo::oop_type ) {
1669 oop_Relocation* r = iter.oop_reloc();
1670 // In this loop, we must only follow those oops directly embedded in
1671 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1672 assert(1 == (r->oop_is_immediate()) +
1673 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1674 "oop must be found in exactly one place");
1675 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1676 f->do_oop(r->oop_addr());
1677 }
1678 }
1679 }
1680 }
1681
1682 // Scopes
1683 // This includes oop constants not inlined in the code stream.
1684 for (oop* p = oops_begin(); p < oops_end(); p++) {
1685 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1686 f->do_oop(p);
1687 }
1688 }
1689
1690 #define NMETHOD_SENTINEL ((nmethod*)badAddress)
1691
1692 nmethod* volatile nmethod::_oops_do_mark_nmethods;
1693
1694 // An nmethod is "marked" if its _mark_link is set non-null.
1695 // Even if it is the end of the linked list, it will have a non-null link value,
1696 // as long as it is on the list.
1697 // This code must be MP safe, because it is used from parallel GC passes.
1698 bool nmethod::test_set_oops_do_mark() {
1699 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");
1700 if (_oops_do_mark_link == NULL) {
1701 // Claim this nmethod for this thread to mark.
1702 if (Atomic::replace_if_null(NMETHOD_SENTINEL, &_oops_do_mark_link)) {
1703 // Atomically append this nmethod (now claimed) to the head of the list:
1704 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods;
1705 for (;;) {
1706 nmethod* required_mark_nmethods = observed_mark_nmethods;
1707 _oops_do_mark_link = required_mark_nmethods;
1708 observed_mark_nmethods =
1709 Atomic::cmpxchg(this, &_oops_do_mark_nmethods, required_mark_nmethods);
1710 if (observed_mark_nmethods == required_mark_nmethods)
1711 break;
1712 }
1713 // Mark was clear when we first saw this guy.
1714 LogTarget(Trace, gc, nmethod) lt;
1715 if (lt.is_enabled()) {
1716 LogStream ls(lt);
1717 CompileTask::print(&ls, this, "oops_do, mark", /*short_form:*/ true);
1718 }
1719 return false;
1720 }
1721 }
1722 // On fall through, another racing thread marked this nmethod before we did.
1723 return true;
1724 }
1725
1726 void nmethod::oops_do_marking_prologue() {
1727 log_trace(gc, nmethod)("oops_do_marking_prologue");
1728 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row");
1729 // We use cmpxchg instead of regular assignment here because the user
1730 // may fork a bunch of threads, and we need them all to see the same state.
1731 nmethod* observed = Atomic::cmpxchg(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, (nmethod*)NULL);
1732 guarantee(observed == NULL, "no races in this sequential code");
1733 }
1734
1735 void nmethod::oops_do_marking_epilogue() {
1736 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row");
1737 nmethod* cur = _oops_do_mark_nmethods;
1738 while (cur != NMETHOD_SENTINEL) {
1739 assert(cur != NULL, "not NULL-terminated");
1740 nmethod* next = cur->_oops_do_mark_link;
1741 cur->_oops_do_mark_link = NULL;
1742 DEBUG_ONLY(cur->verify_oop_relocations());
1743
1744 LogTarget(Trace, gc, nmethod) lt;
1745 if (lt.is_enabled()) {
1746 LogStream ls(lt);
1747 CompileTask::print(&ls, cur, "oops_do, unmark", /*short_form:*/ true);
1748 }
1749 cur = next;
1750 }
1751 nmethod* required = _oops_do_mark_nmethods;
1752 nmethod* observed = Atomic::cmpxchg((nmethod*)NULL, &_oops_do_mark_nmethods, required);
1753 guarantee(observed == required, "no races in this sequential code");
1754 log_trace(gc, nmethod)("oops_do_marking_epilogue");
1755 }
1756
1757 class DetectScavengeRoot: public OopClosure {
1758 bool _detected_scavenge_root;
1759 nmethod* _print_nm;
1760 public:
1761 DetectScavengeRoot(nmethod* nm) : _detected_scavenge_root(false), _print_nm(nm) {}
1762
1763 bool detected_scavenge_root() { return _detected_scavenge_root; }
1764 virtual void do_oop(oop* p) {
1765 if ((*p) != NULL && Universe::heap()->is_scavengable(*p)) {
1766 NOT_PRODUCT(maybe_print(p));
1767 _detected_scavenge_root = true;
1768 }
1769 }
1770 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
1771
1772 #ifndef PRODUCT
1773 void maybe_print(oop* p) {
1774 LogTarget(Trace, gc, nmethod) lt;
1775 if (lt.is_enabled()) {
1776 LogStream ls(lt);
1777 if (!_detected_scavenge_root) {
1778 CompileTask::print(&ls, _print_nm, "new scavenge root", /*short_form:*/ true);
1779 }
1780 ls.print("" PTR_FORMAT "[offset=%d] detected scavengable oop " PTR_FORMAT " (found at " PTR_FORMAT ") ",
1781 p2i(_print_nm), (int)((intptr_t)p - (intptr_t)_print_nm),
1782 p2i(*p), p2i(p));
1783 ls.cr();
1784 }
1785 }
1786 #endif //PRODUCT
1787 };
1788
1789 bool nmethod::detect_scavenge_root_oops() {
1790 DetectScavengeRoot detect_scavenge_root(this);
1791 oops_do(&detect_scavenge_root);
1792 return detect_scavenge_root.detected_scavenge_root();
1793 }
1794
1795 inline bool includes(void* p, void* from, void* to) {
1796 return from <= p && p < to;
1797 }
1798
1799
1800 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
1801 assert(count >= 2, "must be sentinel values, at least");
1802
1803 #ifdef ASSERT
1804 // must be sorted and unique; we do a binary search in find_pc_desc()
1805 int prev_offset = pcs[0].pc_offset();
1806 assert(prev_offset == PcDesc::lower_offset_limit,
1807 "must start with a sentinel");
1808 for (int i = 1; i < count; i++) {
1809 int this_offset = pcs[i].pc_offset();
1810 assert(this_offset > prev_offset, "offsets must be sorted");
1811 prev_offset = this_offset;
1812 }
1813 assert(prev_offset == PcDesc::upper_offset_limit,
1814 "must end with a sentinel");
1815 #endif //ASSERT
1816
1817 // Search for MethodHandle invokes and tag the nmethod.
1818 for (int i = 0; i < count; i++) {
1819 if (pcs[i].is_method_handle_invoke()) {
1820 set_has_method_handle_invokes(true);
1821 break;
1822 }
1823 }
1824 assert(has_method_handle_invokes() == (_deopt_mh_handler_begin != NULL), "must have deopt mh handler");
1825
1826 int size = count * sizeof(PcDesc);
1827 assert(scopes_pcs_size() >= size, "oob");
1828 memcpy(scopes_pcs_begin(), pcs, size);
1829
1830 // Adjust the final sentinel downward.
1831 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
1832 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
1833 last_pc->set_pc_offset(content_size() + 1);
1834 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
1835 // Fill any rounding gaps with copies of the last record.
1836 last_pc[1] = last_pc[0];
1837 }
1838 // The following assert could fail if sizeof(PcDesc) is not
1839 // an integral multiple of oopSize (the rounding term).
1840 // If it fails, change the logic to always allocate a multiple
1841 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
1842 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
1843 }
1844
1845 void nmethod::copy_scopes_data(u_char* buffer, int size) {
1846 assert(scopes_data_size() >= size, "oob");
1847 memcpy(scopes_data_begin(), buffer, size);
1848 }
1849
1850 #ifdef ASSERT
1851 static PcDesc* linear_search(const PcDescSearch& search, int pc_offset, bool approximate) {
1852 PcDesc* lower = search.scopes_pcs_begin();
1853 PcDesc* upper = search.scopes_pcs_end();
1854 lower += 1; // exclude initial sentinel
1855 PcDesc* res = NULL;
1856 for (PcDesc* p = lower; p < upper; p++) {
1857 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc
1858 if (match_desc(p, pc_offset, approximate)) {
1859 if (res == NULL)
1860 res = p;
1861 else
1862 res = (PcDesc*) badAddress;
1863 }
1864 }
1865 return res;
1866 }
1867 #endif
1868
1869
1870 // Finds a PcDesc with real-pc equal to "pc"
1871 PcDesc* PcDescContainer::find_pc_desc_internal(address pc, bool approximate, const PcDescSearch& search) {
1872 address base_address = search.code_begin();
1873 if ((pc < base_address) ||
1874 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
1875 return NULL; // PC is wildly out of range
1876 }
1877 int pc_offset = (int) (pc - base_address);
1878
1879 // Check the PcDesc cache if it contains the desired PcDesc
1880 // (This as an almost 100% hit rate.)
1881 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
1882 if (res != NULL) {
1883 assert(res == linear_search(search, pc_offset, approximate), "cache ok");
1884 return res;
1885 }
1886
1887 // Fallback algorithm: quasi-linear search for the PcDesc
1888 // Find the last pc_offset less than the given offset.
1889 // The successor must be the required match, if there is a match at all.
1890 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
1891 PcDesc* lower = search.scopes_pcs_begin();
1892 PcDesc* upper = search.scopes_pcs_end();
1893 upper -= 1; // exclude final sentinel
1894 if (lower >= upper) return NULL; // native method; no PcDescs at all
1895
1896 #define assert_LU_OK \
1897 /* invariant on lower..upper during the following search: */ \
1898 assert(lower->pc_offset() < pc_offset, "sanity"); \
1899 assert(upper->pc_offset() >= pc_offset, "sanity")
1900 assert_LU_OK;
1901
1902 // Use the last successful return as a split point.
1903 PcDesc* mid = _pc_desc_cache.last_pc_desc();
1904 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1905 if (mid->pc_offset() < pc_offset) {
1906 lower = mid;
1907 } else {
1908 upper = mid;
1909 }
1910
1911 // Take giant steps at first (4096, then 256, then 16, then 1)
1912 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
1913 const int RADIX = (1 << LOG2_RADIX);
1914 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
1915 while ((mid = lower + step) < upper) {
1916 assert_LU_OK;
1917 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1918 if (mid->pc_offset() < pc_offset) {
1919 lower = mid;
1920 } else {
1921 upper = mid;
1922 break;
1923 }
1924 }
1925 assert_LU_OK;
1926 }
1927
1928 // Sneak up on the value with a linear search of length ~16.
1929 while (true) {
1930 assert_LU_OK;
1931 mid = lower + 1;
1932 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1933 if (mid->pc_offset() < pc_offset) {
1934 lower = mid;
1935 } else {
1936 upper = mid;
1937 break;
1938 }
1939 }
1940 #undef assert_LU_OK
1941
1942 if (match_desc(upper, pc_offset, approximate)) {
1943 assert(upper == linear_search(search, pc_offset, approximate), "search ok");
1944 _pc_desc_cache.add_pc_desc(upper);
1945 return upper;
1946 } else {
1947 assert(NULL == linear_search(search, pc_offset, approximate), "search ok");
1948 return NULL;
1949 }
1950 }
1951
1952
1953 void nmethod::check_all_dependencies(DepChange& changes) {
1954 // Checked dependencies are allocated into this ResourceMark
1955 ResourceMark rm;
1956
1957 // Turn off dependency tracing while actually testing dependencies.
1958 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) );
1959
1960 typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash,
1961 &DependencySignature::equals, 11027> DepTable;
1962
1963 DepTable* table = new DepTable();
1964
1965 // Iterate over live nmethods and check dependencies of all nmethods that are not
1966 // marked for deoptimization. A particular dependency is only checked once.
1967 NMethodIterator iter(NMethodIterator::only_alive_and_not_unloading);
1968 while(iter.next()) {
1969 nmethod* nm = iter.method();
1970 // Only notify for live nmethods
1971 if (!nm->is_marked_for_deoptimization()) {
1972 for (Dependencies::DepStream deps(nm); deps.next(); ) {
1973 // Construct abstraction of a dependency.
1974 DependencySignature* current_sig = new DependencySignature(deps);
1975
1976 // Determine if dependency is already checked. table->put(...) returns
1977 // 'true' if the dependency is added (i.e., was not in the hashtable).
1978 if (table->put(*current_sig, 1)) {
1979 if (deps.check_dependency() != NULL) {
1980 // Dependency checking failed. Print out information about the failed
1981 // dependency and finally fail with an assert. We can fail here, since
1982 // dependency checking is never done in a product build.
1983 tty->print_cr("Failed dependency:");
1984 changes.print();
1985 nm->print();
1986 nm->print_dependencies();
1987 assert(false, "Should have been marked for deoptimization");
1988 }
1989 }
1990 }
1991 }
1992 }
1993 }
1994
1995 bool nmethod::check_dependency_on(DepChange& changes) {
1996 // What has happened:
1997 // 1) a new class dependee has been added
1998 // 2) dependee and all its super classes have been marked
1999 bool found_check = false; // set true if we are upset
2000 for (Dependencies::DepStream deps(this); deps.next(); ) {
2001 // Evaluate only relevant dependencies.
2002 if (deps.spot_check_dependency_at(changes) != NULL) {
2003 found_check = true;
2004 NOT_DEBUG(break);
2005 }
2006 }
2007 return found_check;
2008 }
2009
2010 bool nmethod::is_evol_dependent_on(Klass* dependee) {
2011 InstanceKlass *dependee_ik = InstanceKlass::cast(dependee);
2012 Array<Method*>* dependee_methods = dependee_ik->methods();
2013 for (Dependencies::DepStream deps(this); deps.next(); ) {
2014 if (deps.type() == Dependencies::evol_method) {
2015 Method* method = deps.method_argument(0);
2016 for (int j = 0; j < dependee_methods->length(); j++) {
2017 if (dependee_methods->at(j) == method) {
2018 if (log_is_enabled(Debug, redefine, class, nmethod)) {
2019 ResourceMark rm;
2020 log_debug(redefine, class, nmethod)
2021 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)",
2022 _method->method_holder()->external_name(),
2023 _method->name()->as_C_string(),
2024 _method->signature()->as_C_string(),
2025 compile_id(),
2026 method->method_holder()->external_name(),
2027 method->name()->as_C_string(),
2028 method->signature()->as_C_string());
2029 }
2030 if (TraceDependencies || LogCompilation)
2031 deps.log_dependency(dependee);
2032 return true;
2033 }
2034 }
2035 }
2036 }
2037 return false;
2038 }
2039
2040 // Called from mark_for_deoptimization, when dependee is invalidated.
2041 bool nmethod::is_dependent_on_method(Method* dependee) {
2042 for (Dependencies::DepStream deps(this); deps.next(); ) {
2043 if (deps.type() != Dependencies::evol_method)
2044 continue;
2045 Method* method = deps.method_argument(0);
2046 if (method == dependee) return true;
2047 }
2048 return false;
2049 }
2050
2051
2052 bool nmethod::is_patchable_at(address instr_addr) {
2053 assert(insts_contains(instr_addr), "wrong nmethod used");
2054 if (is_zombie()) {
2055 // a zombie may never be patched
2056 return false;
2057 }
2058 return true;
2059 }
2060
2061
2062 address nmethod::continuation_for_implicit_exception(address pc) {
2063 // Exception happened outside inline-cache check code => we are inside
2064 // an active nmethod => use cpc to determine a return address
2065 int exception_offset = pc - code_begin();
2066 int cont_offset = ImplicitExceptionTable(this).at( exception_offset );
2067 #ifdef ASSERT
2068 if (cont_offset == 0) {
2069 Thread* thread = Thread::current();
2070 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
2071 HandleMark hm(thread);
2072 ResourceMark rm(thread);
2073 CodeBlob* cb = CodeCache::find_blob(pc);
2074 assert(cb != NULL && cb == this, "");
2075 ttyLocker ttyl;
2076 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, p2i(pc));
2077 print();
2078 method()->print_codes();
2079 print_code();
2080 print_pcs();
2081 }
2082 #endif
2083 if (cont_offset == 0) {
2084 // Let the normal error handling report the exception
2085 return NULL;
2086 }
2087 return code_begin() + cont_offset;
2088 }
2089
2090
2091
2092 void nmethod_init() {
2093 // make sure you didn't forget to adjust the filler fields
2094 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
2095 }
2096
2097
2098 //-------------------------------------------------------------------------------------------
2099
2100
2101 // QQQ might we make this work from a frame??
2102 nmethodLocker::nmethodLocker(address pc) {
2103 CodeBlob* cb = CodeCache::find_blob(pc);
2104 guarantee(cb != NULL && cb->is_compiled(), "bad pc for a nmethod found");
2105 _nm = cb->as_compiled_method();
2106 lock_nmethod(_nm);
2107 }
2108
2109 // Only JvmtiDeferredEvent::compiled_method_unload_event()
2110 // should pass zombie_ok == true.
2111 void nmethodLocker::lock_nmethod(CompiledMethod* cm, bool zombie_ok) {
2112 if (cm == NULL) return;
2113 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method
2114 nmethod* nm = cm->as_nmethod();
2115 Atomic::inc(&nm->_lock_count);
2116 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method");
2117 }
2118
2119 void nmethodLocker::unlock_nmethod(CompiledMethod* cm) {
2120 if (cm == NULL) return;
2121 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method
2122 nmethod* nm = cm->as_nmethod();
2123 Atomic::dec(&nm->_lock_count);
2124 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock");
2125 }
2126
2127
2128 // -----------------------------------------------------------------------------
2129 // Verification
2130
2131 class VerifyOopsClosure: public OopClosure {
2132 nmethod* _nm;
2133 bool _ok;
2134 public:
2135 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
2136 bool ok() { return _ok; }
2137 virtual void do_oop(oop* p) {
2138 if (oopDesc::is_oop_or_null(*p)) return;
2139 if (_ok) {
2140 _nm->print_nmethod(true);
2141 _ok = false;
2142 }
2143 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2144 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2145 }
2146 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2147 };
2148
2149 void nmethod::verify() {
2150
2151 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant
2152 // seems odd.
2153
2154 if (is_zombie() || is_not_entrant() || is_unloaded())
2155 return;
2156
2157 // Make sure all the entry points are correctly aligned for patching.
2158 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
2159
2160 // assert(oopDesc::is_oop(method()), "must be valid");
2161
2162 ResourceMark rm;
2163
2164 if (!CodeCache::contains(this)) {
2165 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this));
2166 }
2167
2168 if(is_native_method() )
2169 return;
2170
2171 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
2172 if (nm != this) {
2173 fatal("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this));
2174 }
2175
2176 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2177 if (! p->verify(this)) {
2178 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this));
2179 }
2180 }
2181
2182 VerifyOopsClosure voc(this);
2183 oops_do(&voc);
2184 assert(voc.ok(), "embedded oops must be OK");
2185 Universe::heap()->verify_nmethod(this);
2186
2187 verify_scopes();
2188 }
2189
2190
2191 void nmethod::verify_interrupt_point(address call_site) {
2192 // Verify IC only when nmethod installation is finished.
2193 if (!is_not_installed()) {
2194 if (CompiledICLocker::is_safe(this)) {
2195 CompiledIC_at(this, call_site);
2196 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
2197 } else {
2198 CompiledICLocker ml_verify(this);
2199 CompiledIC_at(this, call_site);
2200 }
2201 }
2202
2203 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address());
2204 assert(pd != NULL, "PcDesc must exist");
2205 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(),
2206 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(),
2207 pd->return_oop());
2208 !sd->is_top(); sd = sd->sender()) {
2209 sd->verify();
2210 }
2211 }
2212
2213 void nmethod::verify_scopes() {
2214 if( !method() ) return; // Runtime stubs have no scope
2215 if (method()->is_native()) return; // Ignore stub methods.
2216 // iterate through all interrupt point
2217 // and verify the debug information is valid.
2218 RelocIterator iter((nmethod*)this);
2219 while (iter.next()) {
2220 address stub = NULL;
2221 switch (iter.type()) {
2222 case relocInfo::virtual_call_type:
2223 verify_interrupt_point(iter.addr());
2224 break;
2225 case relocInfo::opt_virtual_call_type:
2226 stub = iter.opt_virtual_call_reloc()->static_stub(false);
2227 verify_interrupt_point(iter.addr());
2228 break;
2229 case relocInfo::static_call_type:
2230 stub = iter.static_call_reloc()->static_stub(false);
2231 //verify_interrupt_point(iter.addr());
2232 break;
2233 case relocInfo::runtime_call_type:
2234 case relocInfo::runtime_call_w_cp_type: {
2235 address destination = iter.reloc()->value();
2236 // Right now there is no way to find out which entries support
2237 // an interrupt point. It would be nice if we had this
2238 // information in a table.
2239 break;
2240 }
2241 default:
2242 break;
2243 }
2244 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section");
2245 }
2246 }
2247
2248
2249 // -----------------------------------------------------------------------------
2250 // Non-product code
2251 #ifndef PRODUCT
2252
2253 class DebugScavengeRoot: public OopClosure {
2254 nmethod* _nm;
2255 bool _ok;
2256 public:
2257 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { }
2258 bool ok() { return _ok; }
2259 virtual void do_oop(oop* p) {
2260 if ((*p) == NULL || !Universe::heap()->is_scavengable(*p)) return;
2261 if (_ok) {
2262 _nm->print_nmethod(true);
2263 _ok = false;
2264 }
2265 tty->print_cr("*** scavengable oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2266 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2267 (*p)->print();
2268 }
2269 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2270 };
2271
2272 void nmethod::verify_scavenge_root_oops() {
2273 if (!on_scavenge_root_list()) {
2274 // Actually look inside, to verify the claim that it's clean.
2275 DebugScavengeRoot debug_scavenge_root(this);
2276 oops_do(&debug_scavenge_root);
2277 if (!debug_scavenge_root.ok())
2278 fatal("found an unadvertised bad scavengable oop in the code cache");
2279 }
2280 assert(scavenge_root_not_marked(), "");
2281 }
2282
2283 #endif // PRODUCT
2284
2285 // Printing operations
2286
2287 void nmethod::print() const {
2288 ResourceMark rm;
2289 ttyLocker ttyl; // keep the following output all in one block
2290
2291 tty->print("Compiled method ");
2292
2293 if (is_compiled_by_c1()) {
2294 tty->print("(c1) ");
2295 } else if (is_compiled_by_c2()) {
2296 tty->print("(c2) ");
2297 } else if (is_compiled_by_jvmci()) {
2298 tty->print("(JVMCI) ");
2299 } else {
2300 tty->print("(nm) ");
2301 }
2302
2303 print_on(tty, NULL);
2304
2305 if (WizardMode) {
2306 tty->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this));
2307 tty->print(" for method " INTPTR_FORMAT , p2i(method()));
2308 tty->print(" { ");
2309 tty->print_cr("%s ", state());
2310 if (on_scavenge_root_list()) tty->print("scavenge_root ");
2311 tty->print_cr("}:");
2312 }
2313 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2314 p2i(this),
2315 p2i(this) + size(),
2316 size());
2317 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2318 p2i(relocation_begin()),
2319 p2i(relocation_end()),
2320 relocation_size());
2321 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2322 p2i(consts_begin()),
2323 p2i(consts_end()),
2324 consts_size());
2325 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2326 p2i(insts_begin()),
2327 p2i(insts_end()),
2328 insts_size());
2329 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2330 p2i(stub_begin()),
2331 p2i(stub_end()),
2332 stub_size());
2333 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2334 p2i(oops_begin()),
2335 p2i(oops_end()),
2336 oops_size());
2337 if (metadata_size () > 0) tty->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2338 p2i(metadata_begin()),
2339 p2i(metadata_end()),
2340 metadata_size());
2341 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2342 p2i(scopes_data_begin()),
2343 p2i(scopes_data_end()),
2344 scopes_data_size());
2345 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2346 p2i(scopes_pcs_begin()),
2347 p2i(scopes_pcs_end()),
2348 scopes_pcs_size());
2349 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2350 p2i(dependencies_begin()),
2351 p2i(dependencies_end()),
2352 dependencies_size());
2353 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2354 p2i(handler_table_begin()),
2355 p2i(handler_table_end()),
2356 handler_table_size());
2357 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2358 p2i(nul_chk_table_begin()),
2359 p2i(nul_chk_table_end()),
2360 nul_chk_table_size());
2361 }
2362
2363 #ifndef PRODUCT
2364
2365 void nmethod::print_scopes() {
2366 // Find the first pc desc for all scopes in the code and print it.
2367 ResourceMark rm;
2368 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2369 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
2370 continue;
2371
2372 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
2373 while (sd != NULL) {
2374 sd->print_on(tty, p);
2375 sd = sd->sender();
2376 }
2377 }
2378 }
2379
2380 void nmethod::print_dependencies() {
2381 ResourceMark rm;
2382 ttyLocker ttyl; // keep the following output all in one block
2383 tty->print_cr("Dependencies:");
2384 for (Dependencies::DepStream deps(this); deps.next(); ) {
2385 deps.print_dependency();
2386 Klass* ctxk = deps.context_type();
2387 if (ctxk != NULL) {
2388 if (ctxk->is_instance_klass() && InstanceKlass::cast(ctxk)->is_dependent_nmethod(this)) {
2389 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name());
2390 }
2391 }
2392 deps.log_dependency(); // put it into the xml log also
2393 }
2394 }
2395
2396
2397 void nmethod::print_relocations() {
2398 ResourceMark m; // in case methods get printed via the debugger
2399 tty->print_cr("relocations:");
2400 RelocIterator iter(this);
2401 iter.print();
2402 }
2403
2404
2405 void nmethod::print_pcs() {
2406 ResourceMark m; // in case methods get printed via debugger
2407 tty->print_cr("pc-bytecode offsets:");
2408 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2409 p->print(this);
2410 }
2411 }
2412
2413 void nmethod::print_recorded_oops() {
2414 tty->print_cr("Recorded oops:");
2415 for (int i = 0; i < oops_count(); i++) {
2416 oop o = oop_at(i);
2417 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(o));
2418 if (o == Universe::non_oop_word()) {
2419 tty->print("non-oop word");
2420 } else {
2421 if (o != NULL) {
2422 o->print_value();
2423 } else {
2424 tty->print_cr("NULL");
2425 }
2426 }
2427 tty->cr();
2428 }
2429 }
2430
2431 void nmethod::print_recorded_metadata() {
2432 tty->print_cr("Recorded metadata:");
2433 for (int i = 0; i < metadata_count(); i++) {
2434 Metadata* m = metadata_at(i);
2435 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(m));
2436 if (m == (Metadata*)Universe::non_oop_word()) {
2437 tty->print("non-metadata word");
2438 } else {
2439 Metadata::print_value_on_maybe_null(tty, m);
2440 }
2441 tty->cr();
2442 }
2443 }
2444
2445 #endif // PRODUCT
2446
2447 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
2448 RelocIterator iter(this, begin, end);
2449 bool have_one = false;
2450 while (iter.next()) {
2451 have_one = true;
2452 switch (iter.type()) {
2453 case relocInfo::none: return "no_reloc";
2454 case relocInfo::oop_type: {
2455 stringStream st;
2456 oop_Relocation* r = iter.oop_reloc();
2457 oop obj = r->oop_value();
2458 st.print("oop(");
2459 if (obj == NULL) st.print("NULL");
2460 else obj->print_value_on(&st);
2461 st.print(")");
2462 return st.as_string();
2463 }
2464 case relocInfo::metadata_type: {
2465 stringStream st;
2466 metadata_Relocation* r = iter.metadata_reloc();
2467 Metadata* obj = r->metadata_value();
2468 st.print("metadata(");
2469 if (obj == NULL) st.print("NULL");
2470 else obj->print_value_on(&st);
2471 st.print(")");
2472 return st.as_string();
2473 }
2474 case relocInfo::runtime_call_type:
2475 case relocInfo::runtime_call_w_cp_type: {
2476 stringStream st;
2477 st.print("runtime_call");
2478 CallRelocation* r = (CallRelocation*)iter.reloc();
2479 address dest = r->destination();
2480 CodeBlob* cb = CodeCache::find_blob(dest);
2481 if (cb != NULL) {
2482 st.print(" %s", cb->name());
2483 } else {
2484 ResourceMark rm;
2485 const int buflen = 1024;
2486 char* buf = NEW_RESOURCE_ARRAY(char, buflen);
2487 int offset;
2488 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) {
2489 st.print(" %s", buf);
2490 if (offset != 0) {
2491 st.print("+%d", offset);
2492 }
2493 }
2494 }
2495 return st.as_string();
2496 }
2497 case relocInfo::virtual_call_type: {
2498 stringStream st;
2499 st.print_raw("virtual_call");
2500 virtual_call_Relocation* r = iter.virtual_call_reloc();
2501 Method* m = r->method_value();
2502 if (m != NULL) {
2503 assert(m->is_method(), "");
2504 m->print_short_name(&st);
2505 }
2506 return st.as_string();
2507 }
2508 case relocInfo::opt_virtual_call_type: {
2509 stringStream st;
2510 st.print_raw("optimized virtual_call");
2511 opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc();
2512 Method* m = r->method_value();
2513 if (m != NULL) {
2514 assert(m->is_method(), "");
2515 m->print_short_name(&st);
2516 }
2517 return st.as_string();
2518 }
2519 case relocInfo::static_call_type: {
2520 stringStream st;
2521 st.print_raw("static_call");
2522 static_call_Relocation* r = iter.static_call_reloc();
2523 Method* m = r->method_value();
2524 if (m != NULL) {
2525 assert(m->is_method(), "");
2526 m->print_short_name(&st);
2527 }
2528 return st.as_string();
2529 }
2530 case relocInfo::static_stub_type: return "static_stub";
2531 case relocInfo::external_word_type: return "external_word";
2532 case relocInfo::internal_word_type: return "internal_word";
2533 case relocInfo::section_word_type: return "section_word";
2534 case relocInfo::poll_type: return "poll";
2535 case relocInfo::poll_return_type: return "poll_return";
2536 case relocInfo::type_mask: return "type_bit_mask";
2537
2538 default:
2539 break;
2540 }
2541 }
2542 return have_one ? "other" : NULL;
2543 }
2544
2545 // Return a the last scope in (begin..end]
2546 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
2547 PcDesc* p = pc_desc_near(begin+1);
2548 if (p != NULL && p->real_pc(this) <= end) {
2549 return new ScopeDesc(this, p->scope_decode_offset(),
2550 p->obj_decode_offset(), p->should_reexecute(), p->rethrow_exception(),
2551 p->return_oop());
2552 }
2553 return NULL;
2554 }
2555
2556 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const {
2557 if (block_begin == entry_point()) stream->print_cr("[Entry Point]");
2558 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]");
2559 if (JVMCI_ONLY(_exception_offset >= 0 &&) block_begin == exception_begin()) stream->print_cr("[Exception Handler]");
2560 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]");
2561 if (JVMCI_ONLY(_deopt_handler_begin != NULL &&) block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]");
2562
2563 if (has_method_handle_invokes())
2564 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]");
2565
2566 if (block_begin == consts_begin()) stream->print_cr("[Constants]");
2567
2568 if (block_begin == entry_point()) {
2569 methodHandle m = method();
2570 if (m.not_null()) {
2571 stream->print(" # ");
2572 m->print_value_on(stream);
2573 stream->cr();
2574 }
2575 if (m.not_null() && !is_osr_method()) {
2576 ResourceMark rm;
2577 int sizeargs = m->size_of_parameters();
2578 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
2579 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
2580 {
2581 int sig_index = 0;
2582 if (!m->is_static())
2583 sig_bt[sig_index++] = T_OBJECT; // 'this'
2584 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) {
2585 BasicType t = ss.type();
2586 sig_bt[sig_index++] = t;
2587 if (type2size[t] == 2) {
2588 sig_bt[sig_index++] = T_VOID;
2589 } else {
2590 assert(type2size[t] == 1, "size is 1 or 2");
2591 }
2592 }
2593 assert(sig_index == sizeargs, "");
2594 }
2595 const char* spname = "sp"; // make arch-specific?
2596 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false);
2597 int stack_slot_offset = this->frame_size() * wordSize;
2598 int tab1 = 14, tab2 = 24;
2599 int sig_index = 0;
2600 int arg_index = (m->is_static() ? 0 : -1);
2601 bool did_old_sp = false;
2602 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) {
2603 bool at_this = (arg_index == -1);
2604 bool at_old_sp = false;
2605 BasicType t = (at_this ? T_OBJECT : ss.type());
2606 assert(t == sig_bt[sig_index], "sigs in sync");
2607 if (at_this)
2608 stream->print(" # this: ");
2609 else
2610 stream->print(" # parm%d: ", arg_index);
2611 stream->move_to(tab1);
2612 VMReg fst = regs[sig_index].first();
2613 VMReg snd = regs[sig_index].second();
2614 if (fst->is_reg()) {
2615 stream->print("%s", fst->name());
2616 if (snd->is_valid()) {
2617 stream->print(":%s", snd->name());
2618 }
2619 } else if (fst->is_stack()) {
2620 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
2621 if (offset == stack_slot_offset) at_old_sp = true;
2622 stream->print("[%s+0x%x]", spname, offset);
2623 } else {
2624 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
2625 }
2626 stream->print(" ");
2627 stream->move_to(tab2);
2628 stream->print("= ");
2629 if (at_this) {
2630 m->method_holder()->print_value_on(stream);
2631 } else {
2632 bool did_name = false;
2633 if (!at_this && ss.is_object()) {
2634 Symbol* name = ss.as_symbol_or_null();
2635 if (name != NULL) {
2636 name->print_value_on(stream);
2637 did_name = true;
2638 }
2639 }
2640 if (!did_name)
2641 stream->print("%s", type2name(t));
2642 }
2643 if (at_old_sp) {
2644 stream->print(" (%s of caller)", spname);
2645 did_old_sp = true;
2646 }
2647 stream->cr();
2648 sig_index += type2size[t];
2649 arg_index += 1;
2650 if (!at_this) ss.next();
2651 }
2652 if (!did_old_sp) {
2653 stream->print(" # ");
2654 stream->move_to(tab1);
2655 stream->print("[%s+0x%x]", spname, stack_slot_offset);
2656 stream->print(" (%s of caller)", spname);
2657 stream->cr();
2658 }
2659 }
2660 }
2661 }
2662
2663 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) {
2664 // First, find an oopmap in (begin, end].
2665 // We use the odd half-closed interval so that oop maps and scope descs
2666 // which are tied to the byte after a call are printed with the call itself.
2667 address base = code_begin();
2668 ImmutableOopMapSet* oms = oop_maps();
2669 if (oms != NULL) {
2670 for (int i = 0, imax = oms->count(); i < imax; i++) {
2671 const ImmutableOopMapPair* pair = oms->pair_at(i);
2672 const ImmutableOopMap* om = pair->get_from(oms);
2673 address pc = base + pair->pc_offset();
2674 if (pc > begin) {
2675 if (pc <= end) {
2676 st->move_to(column);
2677 st->print("; ");
2678 om->print_on(st);
2679 }
2680 break;
2681 }
2682 }
2683 }
2684
2685 // Print any debug info present at this pc.
2686 ScopeDesc* sd = scope_desc_in(begin, end);
2687 if (sd != NULL) {
2688 st->move_to(column);
2689 if (sd->bci() == SynchronizationEntryBCI) {
2690 st->print(";*synchronization entry");
2691 } else if (sd->bci() == AfterBci) {
2692 st->print(";* method exit (unlocked if synchronized)");
2693 } else if (sd->bci() == UnwindBci) {
2694 st->print(";* unwind (locked if synchronized)");
2695 } else if (sd->bci() == AfterExceptionBci) {
2696 st->print(";* unwind (unlocked if synchronized)");
2697 } else if (sd->bci() == UnknownBci) {
2698 st->print(";* unknown");
2699 } else if (sd->bci() == InvalidFrameStateBci) {
2700 st->print(";* invalid frame state");
2701 } else {
2702 if (sd->method() == NULL) {
2703 st->print("method is NULL");
2704 } else if (sd->method()->is_native()) {
2705 st->print("method is native");
2706 } else {
2707 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci());
2708 st->print(";*%s", Bytecodes::name(bc));
2709 switch (bc) {
2710 case Bytecodes::_invokevirtual:
2711 case Bytecodes::_invokespecial:
2712 case Bytecodes::_invokestatic:
2713 case Bytecodes::_invokeinterface:
2714 {
2715 Bytecode_invoke invoke(sd->method(), sd->bci());
2716 st->print(" ");
2717 if (invoke.name() != NULL)
2718 invoke.name()->print_symbol_on(st);
2719 else
2720 st->print("<UNKNOWN>");
2721 break;
2722 }
2723 case Bytecodes::_getfield:
2724 case Bytecodes::_putfield:
2725 case Bytecodes::_getstatic:
2726 case Bytecodes::_putstatic:
2727 {
2728 Bytecode_field field(sd->method(), sd->bci());
2729 st->print(" ");
2730 if (field.name() != NULL)
2731 field.name()->print_symbol_on(st);
2732 else
2733 st->print("<UNKNOWN>");
2734 }
2735 default:
2736 break;
2737 }
2738 }
2739 st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop());
2740 }
2741
2742 // Print all scopes
2743 for (;sd != NULL; sd = sd->sender()) {
2744 st->move_to(column);
2745 st->print("; -");
2746 if (sd->method() == NULL) {
2747 st->print("method is NULL");
2748 } else {
2749 sd->method()->print_short_name(st);
2750 }
2751 int lineno = sd->method()->line_number_from_bci(sd->bci());
2752 if (lineno != -1) {
2753 st->print("@%d (line %d)", sd->bci(), lineno);
2754 } else {
2755 st->print("@%d", sd->bci());
2756 }
2757 st->cr();
2758 }
2759 }
2760
2761 // Print relocation information
2762 const char* str = reloc_string_for(begin, end);
2763 if (str != NULL) {
2764 if (sd != NULL) st->cr();
2765 st->move_to(column);
2766 st->print("; {%s}", str);
2767 }
2768 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin());
2769 if (cont_offset != 0) {
2770 st->move_to(column);
2771 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset));
2772 }
2773
2774 }
2775
2776 class DirectNativeCallWrapper: public NativeCallWrapper {
2777 private:
2778 NativeCall* _call;
2779
2780 public:
2781 DirectNativeCallWrapper(NativeCall* call) : _call(call) {}
2782
2783 virtual address destination() const { return _call->destination(); }
2784 virtual address instruction_address() const { return _call->instruction_address(); }
2785 virtual address next_instruction_address() const { return _call->next_instruction_address(); }
2786 virtual address return_address() const { return _call->return_address(); }
2787
2788 virtual address get_resolve_call_stub(bool is_optimized) const {
2789 if (is_optimized) {
2790 return SharedRuntime::get_resolve_opt_virtual_call_stub();
2791 }
2792 return SharedRuntime::get_resolve_virtual_call_stub();
2793 }
2794
2795 virtual void set_destination_mt_safe(address dest) {
2796 #if INCLUDE_AOT
2797 if (UseAOT) {
2798 CodeBlob* callee = CodeCache::find_blob(dest);
2799 CompiledMethod* cm = callee->as_compiled_method_or_null();
2800 if (cm != NULL && cm->is_far_code()) {
2801 // Temporary fix, see JDK-8143106
2802 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address());
2803 csc->set_to_far(methodHandle(cm->method()), dest);
2804 return;
2805 }
2806 }
2807 #endif
2808 _call->set_destination_mt_safe(dest);
2809 }
2810
2811 virtual void set_to_interpreted(const methodHandle& method, CompiledICInfo& info) {
2812 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address());
2813 #if INCLUDE_AOT
2814 if (info.to_aot()) {
2815 csc->set_to_far(method, info.entry());
2816 } else
2817 #endif
2818 {
2819 csc->set_to_interpreted(method, info.entry());
2820 }
2821 }
2822
2823 virtual void verify() const {
2824 // make sure code pattern is actually a call imm32 instruction
2825 _call->verify();
2826 _call->verify_alignment();
2827 }
2828
2829 virtual void verify_resolve_call(address dest) const {
2830 CodeBlob* db = CodeCache::find_blob_unsafe(dest);
2831 assert(db != NULL && !db->is_adapter_blob(), "must use stub!");
2832 }
2833
2834 virtual bool is_call_to_interpreted(address dest) const {
2835 CodeBlob* cb = CodeCache::find_blob(_call->instruction_address());
2836 return cb->contains(dest);
2837 }
2838
2839 virtual bool is_safe_for_patching() const { return false; }
2840
2841 virtual NativeInstruction* get_load_instruction(virtual_call_Relocation* r) const {
2842 return nativeMovConstReg_at(r->cached_value());
2843 }
2844
2845 virtual void *get_data(NativeInstruction* instruction) const {
2846 return (void*)((NativeMovConstReg*) instruction)->data();
2847 }
2848
2849 virtual void set_data(NativeInstruction* instruction, intptr_t data) {
2850 ((NativeMovConstReg*) instruction)->set_data(data);
2851 }
2852 };
2853
2854 NativeCallWrapper* nmethod::call_wrapper_at(address call) const {
2855 return new DirectNativeCallWrapper((NativeCall*) call);
2856 }
2857
2858 NativeCallWrapper* nmethod::call_wrapper_before(address return_pc) const {
2859 return new DirectNativeCallWrapper(nativeCall_before(return_pc));
2860 }
2861
2862 address nmethod::call_instruction_address(address pc) const {
2863 if (NativeCall::is_call_before(pc)) {
2864 NativeCall *ncall = nativeCall_before(pc);
2865 return ncall->instruction_address();
2866 }
2867 return NULL;
2868 }
2869
2870 CompiledStaticCall* nmethod::compiledStaticCall_at(Relocation* call_site) const {
2871 return CompiledDirectStaticCall::at(call_site);
2872 }
2873
2874 CompiledStaticCall* nmethod::compiledStaticCall_at(address call_site) const {
2875 return CompiledDirectStaticCall::at(call_site);
2876 }
2877
2878 CompiledStaticCall* nmethod::compiledStaticCall_before(address return_addr) const {
2879 return CompiledDirectStaticCall::before(return_addr);
2880 }
2881
2882 #ifndef PRODUCT
2883
2884 void nmethod::print_value_on(outputStream* st) const {
2885 st->print("nmethod");
2886 print_on(st, NULL);
2887 }
2888
2889 void nmethod::print_calls(outputStream* st) {
2890 RelocIterator iter(this);
2891 while (iter.next()) {
2892 switch (iter.type()) {
2893 case relocInfo::virtual_call_type:
2894 case relocInfo::opt_virtual_call_type: {
2895 CompiledICLocker ml_verify(this);
2896 CompiledIC_at(&iter)->print();
2897 break;
2898 }
2899 case relocInfo::static_call_type:
2900 st->print_cr("Static call at " INTPTR_FORMAT, p2i(iter.reloc()->addr()));
2901 CompiledDirectStaticCall::at(iter.reloc())->print();
2902 break;
2903 default:
2904 break;
2905 }
2906 }
2907 }
2908
2909 void nmethod::print_handler_table() {
2910 ExceptionHandlerTable(this).print();
2911 }
2912
2913 void nmethod::print_nul_chk_table() {
2914 ImplicitExceptionTable(this).print(code_begin());
2915 }
2916
2917 void nmethod::print_statistics() {
2918 ttyLocker ttyl;
2919 if (xtty != NULL) xtty->head("statistics type='nmethod'");
2920 native_nmethod_stats.print_native_nmethod_stats();
2921 #ifdef COMPILER1
2922 c1_java_nmethod_stats.print_nmethod_stats("C1");
2923 #endif
2924 #ifdef COMPILER2
2925 c2_java_nmethod_stats.print_nmethod_stats("C2");
2926 #endif
2927 #if INCLUDE_JVMCI
2928 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI");
2929 #endif
2930 unknown_java_nmethod_stats.print_nmethod_stats("Unknown");
2931 DebugInformationRecorder::print_statistics();
2932 #ifndef PRODUCT
2933 pc_nmethod_stats.print_pc_stats();
2934 #endif
2935 Dependencies::print_statistics();
2936 if (xtty != NULL) xtty->tail("statistics");
2937 }
2938
2939 #endif // !PRODUCT
2940
2941 #if INCLUDE_JVMCI
2942 void nmethod::clear_jvmci_installed_code() {
2943 assert_locked_or_safepoint(Patching_lock);
2944 if (_jvmci_installed_code != NULL) {
2945 JNIHandles::destroy_weak_global(_jvmci_installed_code);
2946 _jvmci_installed_code = NULL;
2947 }
2948 }
2949
2950 void nmethod::clear_speculation_log() {
2951 assert_locked_or_safepoint(Patching_lock);
2952 if (_speculation_log != NULL) {
2953 JNIHandles::destroy_weak_global(_speculation_log);
2954 _speculation_log = NULL;
2955 }
2956 }
2957
2958 void nmethod::maybe_invalidate_installed_code() {
2959 if (!is_compiled_by_jvmci()) {
2960 return;
2961 }
2962
2963 assert(Patching_lock->is_locked() ||
2964 SafepointSynchronize::is_at_safepoint(), "should be performed under a lock for consistency");
2965 oop installed_code = JNIHandles::resolve(_jvmci_installed_code);
2966 if (installed_code != NULL) {
2967 // Update the values in the InstalledCode instance if it still refers to this nmethod
2968 nmethod* nm = (nmethod*)InstalledCode::address(installed_code);
2969 if (nm == this) {
2970 if (!is_alive() || is_unloading()) {
2971 // Break the link between nmethod and InstalledCode such that the nmethod
2972 // can subsequently be flushed safely. The link must be maintained while
2973 // the method could have live activations since invalidateInstalledCode
2974 // might want to invalidate all existing activations.
2975 InstalledCode::set_address(installed_code, 0);
2976 InstalledCode::set_entryPoint(installed_code, 0);
2977 } else if (is_not_entrant()) {
2978 // Remove the entry point so any invocation will fail but keep
2979 // the address link around that so that existing activations can
2980 // be invalidated.
2981 InstalledCode::set_entryPoint(installed_code, 0);
2982 }
2983 }
2984 }
2985 if (!is_alive() || is_unloading()) {
2986 // Clear these out after the nmethod has been unregistered and any
2987 // updates to the InstalledCode instance have been performed.
2988 clear_jvmci_installed_code();
2989 clear_speculation_log();
2990 }
2991 }
2992
2993 void nmethod::invalidate_installed_code(Handle installedCode, TRAPS) {
2994 if (installedCode() == NULL) {
2995 THROW(vmSymbols::java_lang_NullPointerException());
2996 }
2997 jlong nativeMethod = InstalledCode::address(installedCode);
2998 nmethod* nm = (nmethod*)nativeMethod;
2999 if (nm == NULL) {
3000 // Nothing to do
3001 return;
3002 }
3003
3004 nmethodLocker nml(nm);
3005 #ifdef ASSERT
3006 {
3007 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
3008 // This relationship can only be checked safely under a lock
3009 assert(!nm->is_alive() || nm->is_unloading() || nm->jvmci_installed_code() == installedCode(), "sanity check");
3010 }
3011 #endif
3012
3013 if (nm->is_alive()) {
3014 // Invalidating the InstalledCode means we want the nmethod
3015 // to be deoptimized.
3016 nm->mark_for_deoptimization();
3017 VM_Deoptimize op;
3018 VMThread::execute(&op);
3019 }
3020
3021 // Multiple threads could reach this point so we now need to
3022 // lock and re-check the link to the nmethod so that only one
3023 // thread clears it.
3024 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
3025 if (InstalledCode::address(installedCode) == nativeMethod) {
3026 InstalledCode::set_address(installedCode, 0);
3027 }
3028 }
3029
3030 oop nmethod::jvmci_installed_code() {
3031 return JNIHandles::resolve(_jvmci_installed_code);
3032 }
3033
3034 oop nmethod::speculation_log() {
3035 return JNIHandles::resolve(_speculation_log);
3036 }
3037
3038 char* nmethod::jvmci_installed_code_name(char* buf, size_t buflen) const {
3039 if (!this->is_compiled_by_jvmci()) {
3040 return NULL;
3041 }
3042 oop installed_code = JNIHandles::resolve(_jvmci_installed_code);
3043 if (installed_code != NULL) {
3044 oop installed_code_name = NULL;
3045 if (installed_code->is_a(InstalledCode::klass())) {
3046 installed_code_name = InstalledCode::name(installed_code);
3047 }
3048 if (installed_code_name != NULL) {
3049 return java_lang_String::as_utf8_string(installed_code_name, buf, (int)buflen);
3050 }
3051 }
3052 return NULL;
3053 }
3054 #endif