1 /*
2 * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "jvm.h"
27 #include "code/codeCache.hpp"
28 #include "code/compiledIC.hpp"
29 #include "code/compiledMethod.inline.hpp"
30 #include "code/dependencies.hpp"
31 #include "code/nativeInst.hpp"
32 #include "code/nmethod.hpp"
33 #include "code/scopeDesc.hpp"
34 #include "compiler/abstractCompiler.hpp"
35 #include "compiler/compileBroker.hpp"
36 #include "compiler/compileLog.hpp"
37 #include "compiler/compilerDirectives.hpp"
38 #include "compiler/directivesParser.hpp"
39 #include "compiler/disassembler.hpp"
40 #include "interpreter/bytecode.hpp"
41 #include "logging/log.hpp"
42 #include "logging/logStream.hpp"
43 #include "memory/allocation.inline.hpp"
44 #include "memory/resourceArea.hpp"
45 #include "oops/access.inline.hpp"
46 #include "oops/method.inline.hpp"
47 #include "oops/methodData.hpp"
48 #include "oops/oop.inline.hpp"
49 #include "prims/jvmtiImpl.hpp"
50 #include "runtime/atomic.hpp"
51 #include "runtime/flags/flagSetting.hpp"
52 #include "runtime/frame.inline.hpp"
53 #include "runtime/handles.inline.hpp"
54 #include "runtime/jniHandles.inline.hpp"
55 #include "runtime/orderAccess.hpp"
56 #include "runtime/os.hpp"
57 #include "runtime/safepointVerifiers.hpp"
58 #include "runtime/sharedRuntime.hpp"
59 #include "runtime/sweeper.hpp"
60 #include "runtime/vmThread.hpp"
61 #include "utilities/align.hpp"
62 #include "utilities/dtrace.hpp"
63 #include "utilities/events.hpp"
64 #include "utilities/resourceHash.hpp"
65 #include "utilities/xmlstream.hpp"
66 #if INCLUDE_JVMCI
67 #include "jvmci/jvmciJavaClasses.hpp"
68 #endif
69
70 #ifdef DTRACE_ENABLED
71
72 // Only bother with this argument setup if dtrace is available
73
74 #define DTRACE_METHOD_UNLOAD_PROBE(method) \
75 { \
76 Method* m = (method); \
77 if (m != NULL) { \
78 Symbol* klass_name = m->klass_name(); \
79 Symbol* name = m->name(); \
80 Symbol* signature = m->signature(); \
81 HOTSPOT_COMPILED_METHOD_UNLOAD( \
82 (char *) klass_name->bytes(), klass_name->utf8_length(), \
83 (char *) name->bytes(), name->utf8_length(), \
84 (char *) signature->bytes(), signature->utf8_length()); \
85 } \
86 }
87
88 #else // ndef DTRACE_ENABLED
89
90 #define DTRACE_METHOD_UNLOAD_PROBE(method)
91
92 #endif
93
94 //---------------------------------------------------------------------------------
95 // NMethod statistics
96 // They are printed under various flags, including:
97 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation.
98 // (In the latter two cases, they like other stats are printed to the log only.)
99
100 #ifndef PRODUCT
101 // These variables are put into one block to reduce relocations
102 // and make it simpler to print from the debugger.
103 struct java_nmethod_stats_struct {
104 int nmethod_count;
105 int total_size;
106 int relocation_size;
107 int consts_size;
108 int insts_size;
109 int stub_size;
110 int scopes_data_size;
111 int scopes_pcs_size;
112 int dependencies_size;
113 int handler_table_size;
114 int nul_chk_table_size;
115 int oops_size;
116 int metadata_size;
117
118 void note_nmethod(nmethod* nm) {
119 nmethod_count += 1;
120 total_size += nm->size();
121 relocation_size += nm->relocation_size();
122 consts_size += nm->consts_size();
123 insts_size += nm->insts_size();
124 stub_size += nm->stub_size();
125 oops_size += nm->oops_size();
126 metadata_size += nm->metadata_size();
127 scopes_data_size += nm->scopes_data_size();
128 scopes_pcs_size += nm->scopes_pcs_size();
129 dependencies_size += nm->dependencies_size();
130 handler_table_size += nm->handler_table_size();
131 nul_chk_table_size += nm->nul_chk_table_size();
132 }
133 void print_nmethod_stats(const char* name) {
134 if (nmethod_count == 0) return;
135 tty->print_cr("Statistics for %d bytecoded nmethods for %s:", nmethod_count, name);
136 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size);
137 if (nmethod_count != 0) tty->print_cr(" header = " SIZE_FORMAT, nmethod_count * sizeof(nmethod));
138 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size);
139 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size);
140 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size);
141 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size);
142 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size);
143 if (metadata_size != 0) tty->print_cr(" metadata = %d", metadata_size);
144 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size);
145 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size);
146 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size);
147 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size);
148 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size);
149 }
150 };
151
152 struct native_nmethod_stats_struct {
153 int native_nmethod_count;
154 int native_total_size;
155 int native_relocation_size;
156 int native_insts_size;
157 int native_oops_size;
158 int native_metadata_size;
159 void note_native_nmethod(nmethod* nm) {
160 native_nmethod_count += 1;
161 native_total_size += nm->size();
162 native_relocation_size += nm->relocation_size();
163 native_insts_size += nm->insts_size();
164 native_oops_size += nm->oops_size();
165 native_metadata_size += nm->metadata_size();
166 }
167 void print_native_nmethod_stats() {
168 if (native_nmethod_count == 0) return;
169 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count);
170 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size);
171 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size);
172 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size);
173 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size);
174 if (native_metadata_size != 0) tty->print_cr(" N. metadata = %d", native_metadata_size);
175 }
176 };
177
178 struct pc_nmethod_stats_struct {
179 int pc_desc_resets; // number of resets (= number of caches)
180 int pc_desc_queries; // queries to nmethod::find_pc_desc
181 int pc_desc_approx; // number of those which have approximate true
182 int pc_desc_repeats; // number of _pc_descs[0] hits
183 int pc_desc_hits; // number of LRU cache hits
184 int pc_desc_tests; // total number of PcDesc examinations
185 int pc_desc_searches; // total number of quasi-binary search steps
186 int pc_desc_adds; // number of LUR cache insertions
187
188 void print_pc_stats() {
189 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query",
190 pc_desc_queries,
191 (double)(pc_desc_tests + pc_desc_searches)
192 / pc_desc_queries);
193 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d",
194 pc_desc_resets,
195 pc_desc_queries, pc_desc_approx,
196 pc_desc_repeats, pc_desc_hits,
197 pc_desc_tests, pc_desc_searches, pc_desc_adds);
198 }
199 };
200
201 #ifdef COMPILER1
202 static java_nmethod_stats_struct c1_java_nmethod_stats;
203 #endif
204 #ifdef COMPILER2
205 static java_nmethod_stats_struct c2_java_nmethod_stats;
206 #endif
207 #if INCLUDE_JVMCI
208 static java_nmethod_stats_struct jvmci_java_nmethod_stats;
209 #endif
210 static java_nmethod_stats_struct unknown_java_nmethod_stats;
211
212 static native_nmethod_stats_struct native_nmethod_stats;
213 static pc_nmethod_stats_struct pc_nmethod_stats;
214
215 static void note_java_nmethod(nmethod* nm) {
216 #ifdef COMPILER1
217 if (nm->is_compiled_by_c1()) {
218 c1_java_nmethod_stats.note_nmethod(nm);
219 } else
220 #endif
221 #ifdef COMPILER2
222 if (nm->is_compiled_by_c2()) {
223 c2_java_nmethod_stats.note_nmethod(nm);
224 } else
225 #endif
226 #if INCLUDE_JVMCI
227 if (nm->is_compiled_by_jvmci()) {
228 jvmci_java_nmethod_stats.note_nmethod(nm);
229 } else
230 #endif
231 {
232 unknown_java_nmethod_stats.note_nmethod(nm);
233 }
234 }
235 #endif // !PRODUCT
236
237 //---------------------------------------------------------------------------------
238
239
240 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) {
241 assert(pc != NULL, "Must be non null");
242 assert(exception.not_null(), "Must be non null");
243 assert(handler != NULL, "Must be non null");
244
245 _count = 0;
246 _exception_type = exception->klass();
247 _next = NULL;
248 _purge_list_next = NULL;
249
250 add_address_and_handler(pc,handler);
251 }
252
253
254 address ExceptionCache::match(Handle exception, address pc) {
255 assert(pc != NULL,"Must be non null");
256 assert(exception.not_null(),"Must be non null");
257 if (exception->klass() == exception_type()) {
258 return (test_address(pc));
259 }
260
261 return NULL;
262 }
263
264
265 bool ExceptionCache::match_exception_with_space(Handle exception) {
266 assert(exception.not_null(),"Must be non null");
267 if (exception->klass() == exception_type() && count() < cache_size) {
268 return true;
269 }
270 return false;
271 }
272
273
274 address ExceptionCache::test_address(address addr) {
275 int limit = count();
276 for (int i = 0; i < limit; i++) {
277 if (pc_at(i) == addr) {
278 return handler_at(i);
279 }
280 }
281 return NULL;
282 }
283
284
285 bool ExceptionCache::add_address_and_handler(address addr, address handler) {
286 if (test_address(addr) == handler) return true;
287
288 int index = count();
289 if (index < cache_size) {
290 set_pc_at(index, addr);
291 set_handler_at(index, handler);
292 increment_count();
293 return true;
294 }
295 return false;
296 }
297
298 ExceptionCache* ExceptionCache::next() {
299 return Atomic::load(&_next);
300 }
301
302 void ExceptionCache::set_next(ExceptionCache *ec) {
303 Atomic::store(ec, &_next);
304 }
305
306 //-----------------------------------------------------------------------------
307
308
309 // Helper used by both find_pc_desc methods.
310 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) {
311 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_tests);
312 if (!approximate)
313 return pc->pc_offset() == pc_offset;
314 else
315 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset();
316 }
317
318 void PcDescCache::reset_to(PcDesc* initial_pc_desc) {
319 if (initial_pc_desc == NULL) {
320 _pc_descs[0] = NULL; // native method; no PcDescs at all
321 return;
322 }
323 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_resets);
324 // reset the cache by filling it with benign (non-null) values
325 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel");
326 for (int i = 0; i < cache_size; i++)
327 _pc_descs[i] = initial_pc_desc;
328 }
329
330 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) {
331 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_queries);
332 NOT_PRODUCT(if (approximate) ++pc_nmethod_stats.pc_desc_approx);
333
334 // Note: one might think that caching the most recently
335 // read value separately would be a win, but one would be
336 // wrong. When many threads are updating it, the cache
337 // line it's in would bounce between caches, negating
338 // any benefit.
339
340 // In order to prevent race conditions do not load cache elements
341 // repeatedly, but use a local copy:
342 PcDesc* res;
343
344 // Step one: Check the most recently added value.
345 res = _pc_descs[0];
346 if (res == NULL) return NULL; // native method; no PcDescs at all
347 if (match_desc(res, pc_offset, approximate)) {
348 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_repeats);
349 return res;
350 }
351
352 // Step two: Check the rest of the LRU cache.
353 for (int i = 1; i < cache_size; ++i) {
354 res = _pc_descs[i];
355 if (res->pc_offset() < 0) break; // optimization: skip empty cache
356 if (match_desc(res, pc_offset, approximate)) {
357 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_hits);
358 return res;
359 }
360 }
361
362 // Report failure.
363 return NULL;
364 }
365
366 void PcDescCache::add_pc_desc(PcDesc* pc_desc) {
367 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_adds);
368 // Update the LRU cache by shifting pc_desc forward.
369 for (int i = 0; i < cache_size; i++) {
370 PcDesc* next = _pc_descs[i];
371 _pc_descs[i] = pc_desc;
372 pc_desc = next;
373 }
374 }
375
376 // adjust pcs_size so that it is a multiple of both oopSize and
377 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple
378 // of oopSize, then 2*sizeof(PcDesc) is)
379 static int adjust_pcs_size(int pcs_size) {
380 int nsize = align_up(pcs_size, oopSize);
381 if ((nsize % sizeof(PcDesc)) != 0) {
382 nsize = pcs_size + sizeof(PcDesc);
383 }
384 assert((nsize % oopSize) == 0, "correct alignment");
385 return nsize;
386 }
387
388
389 int nmethod::total_size() const {
390 return
391 consts_size() +
392 insts_size() +
393 stub_size() +
394 scopes_data_size() +
395 scopes_pcs_size() +
396 handler_table_size() +
397 nul_chk_table_size();
398 }
399
400 address* nmethod::orig_pc_addr(const frame* fr) {
401 return (address*) ((address)fr->unextended_sp() + _orig_pc_offset);
402 }
403
404 const char* nmethod::compile_kind() const {
405 if (is_osr_method()) return "osr";
406 if (method() != NULL && is_native_method()) return "c2n";
407 return NULL;
408 }
409
410 // Fill in default values for various flag fields
411 void nmethod::init_defaults() {
412 _state = not_installed;
413 _has_flushed_dependencies = 0;
414 _lock_count = 0;
415 _stack_traversal_mark = 0;
416 _unload_reported = false; // jvmti state
417 _is_far_code = false; // nmethods are located in CodeCache
418
419 #ifdef ASSERT
420 _oops_are_stale = false;
421 #endif
422
423 _oops_do_mark_link = NULL;
424 _jmethod_id = NULL;
425 _osr_link = NULL;
426 _scavenge_root_link = NULL;
427 _scavenge_root_state = 0;
428 #if INCLUDE_RTM_OPT
429 _rtm_state = NoRTM;
430 #endif
431 #if INCLUDE_JVMCI
432 _jvmci_installed_code = NULL;
433 _speculation_log = NULL;
434 _jvmci_installed_code_triggers_invalidation = false;
435 #endif
436 }
437
438 nmethod* nmethod::new_native_nmethod(const methodHandle& method,
439 int compile_id,
440 CodeBuffer *code_buffer,
441 int vep_offset,
442 int frame_complete,
443 int frame_size,
444 ByteSize basic_lock_owner_sp_offset,
445 ByteSize basic_lock_sp_offset,
446 OopMapSet* oop_maps) {
447 code_buffer->finalize_oop_references(method);
448 // create nmethod
449 nmethod* nm = NULL;
450 {
451 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
452 int native_nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod));
453 CodeOffsets offsets;
454 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
455 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
456 nm = new (native_nmethod_size, CompLevel_none) nmethod(method(), compiler_none, native_nmethod_size,
457 compile_id, &offsets,
458 code_buffer, frame_size,
459 basic_lock_owner_sp_offset,
460 basic_lock_sp_offset, oop_maps);
461 NOT_PRODUCT(if (nm != NULL) native_nmethod_stats.note_native_nmethod(nm));
462 }
463
464 if (nm != NULL) {
465 // verify nmethod
466 debug_only(nm->verify();) // might block
467
468 nm->log_new_nmethod();
469 nm->make_in_use();
470 }
471 return nm;
472 }
473
474 nmethod* nmethod::new_nmethod(const methodHandle& method,
475 int compile_id,
476 int entry_bci,
477 CodeOffsets* offsets,
478 int orig_pc_offset,
479 DebugInformationRecorder* debug_info,
480 Dependencies* dependencies,
481 CodeBuffer* code_buffer, int frame_size,
482 OopMapSet* oop_maps,
483 ExceptionHandlerTable* handler_table,
484 ImplicitExceptionTable* nul_chk_table,
485 AbstractCompiler* compiler,
486 int comp_level
487 #if INCLUDE_JVMCI
488 , jweak installed_code,
489 jweak speculationLog
490 #endif
491 )
492 {
493 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
494 code_buffer->finalize_oop_references(method);
495 // create nmethod
496 nmethod* nm = NULL;
497 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
498 int nmethod_size =
499 CodeBlob::allocation_size(code_buffer, sizeof(nmethod))
500 + adjust_pcs_size(debug_info->pcs_size())
501 + align_up((int)dependencies->size_in_bytes(), oopSize)
502 + align_up(handler_table->size_in_bytes() , oopSize)
503 + align_up(nul_chk_table->size_in_bytes() , oopSize)
504 + align_up(debug_info->data_size() , oopSize);
505
506 nm = new (nmethod_size, comp_level)
507 nmethod(method(), compiler->type(), nmethod_size, compile_id, entry_bci, offsets,
508 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size,
509 oop_maps,
510 handler_table,
511 nul_chk_table,
512 compiler,
513 comp_level
514 #if INCLUDE_JVMCI
515 , installed_code,
516 speculationLog
517 #endif
518 );
519
520 if (nm != NULL) {
521 // To make dependency checking during class loading fast, record
522 // the nmethod dependencies in the classes it is dependent on.
523 // This allows the dependency checking code to simply walk the
524 // class hierarchy above the loaded class, checking only nmethods
525 // which are dependent on those classes. The slow way is to
526 // check every nmethod for dependencies which makes it linear in
527 // the number of methods compiled. For applications with a lot
528 // classes the slow way is too slow.
529 for (Dependencies::DepStream deps(nm); deps.next(); ) {
530 if (deps.type() == Dependencies::call_site_target_value) {
531 // CallSite dependencies are managed on per-CallSite instance basis.
532 oop call_site = deps.argument_oop(0);
533 MethodHandles::add_dependent_nmethod(call_site, nm);
534 } else {
535 Klass* klass = deps.context_type();
536 if (klass == NULL) {
537 continue; // ignore things like evol_method
538 }
539 // record this nmethod as dependent on this klass
540 InstanceKlass::cast(klass)->add_dependent_nmethod(nm);
541 }
542 }
543 NOT_PRODUCT(if (nm != NULL) note_java_nmethod(nm));
544 }
545 }
546 // Do verification and logging outside CodeCache_lock.
547 if (nm != NULL) {
548 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
549 DEBUG_ONLY(nm->verify();)
550 nm->log_new_nmethod();
551 }
552 return nm;
553 }
554
555 // For native wrappers
556 nmethod::nmethod(
557 Method* method,
558 CompilerType type,
559 int nmethod_size,
560 int compile_id,
561 CodeOffsets* offsets,
562 CodeBuffer* code_buffer,
563 int frame_size,
564 ByteSize basic_lock_owner_sp_offset,
565 ByteSize basic_lock_sp_offset,
566 OopMapSet* oop_maps )
567 : CompiledMethod(method, "native nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false),
568 _is_unloading_state(0),
569 _native_receiver_sp_offset(basic_lock_owner_sp_offset),
570 _native_basic_lock_sp_offset(basic_lock_sp_offset)
571 {
572 {
573 int scopes_data_offset = 0;
574 int deoptimize_offset = 0;
575 int deoptimize_mh_offset = 0;
576
577 debug_only(NoSafepointVerifier nsv;)
578 assert_locked_or_safepoint(CodeCache_lock);
579
580 init_defaults();
581 _entry_bci = InvocationEntryBci;
582 // We have no exception handler or deopt handler make the
583 // values something that will never match a pc like the nmethod vtable entry
584 _exception_offset = 0;
585 _orig_pc_offset = 0;
586
587 _consts_offset = data_offset();
588 _stub_offset = data_offset();
589 _oops_offset = data_offset();
590 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize);
591 scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize);
592 _scopes_pcs_offset = scopes_data_offset;
593 _dependencies_offset = _scopes_pcs_offset;
594 _handler_table_offset = _dependencies_offset;
595 _nul_chk_table_offset = _handler_table_offset;
596 _nmethod_end_offset = _nul_chk_table_offset;
597 _compile_id = compile_id;
598 _comp_level = CompLevel_none;
599 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
600 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
601 _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 {
1103 // Clear ICStubs and release any CompiledICHolders.
1104 CompiledICLocker ml(this);
1105 clear_ic_callsites();
1106 }
1107
1108 // Unregister must be done before the state change
1109 {
1110 MutexLockerEx ml(SafepointSynchronize::is_at_safepoint() ? NULL : CodeCache_lock,
1111 Mutex::_no_safepoint_check_flag);
1112 Universe::heap()->unregister_nmethod(this);
1113 }
1114
1115 // Log the unloading.
1116 log_state_change();
1117
1118 #if INCLUDE_JVMCI
1119 // The method can only be unloaded after the pointer to the installed code
1120 // Java wrapper is no longer alive. Here we need to clear out this weak
1121 // reference to the dead object.
1122 maybe_invalidate_installed_code();
1123 #endif
1124
1125 // The Method* is gone at this point
1126 assert(_method == NULL, "Tautology");
1127
1128 set_osr_link(NULL);
1129 NMethodSweeper::report_state_change(this);
1130
1131 // The release is only needed for compile-time ordering, as accesses
1132 // into the nmethod after the store are not safe due to the sweeper
1133 // being allowed to free it when the store is observed, during
1134 // concurrent nmethod unloading. Therefore, there is no need for
1135 // acquire on the loader side.
1136 OrderAccess::release_store(&_state, (signed char)unloaded);
1137 }
1138
1139 void nmethod::invalidate_osr_method() {
1140 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
1141 // Remove from list of active nmethods
1142 if (method() != NULL) {
1143 method()->method_holder()->remove_osr_nmethod(this);
1144 }
1145 }
1146
1147 void nmethod::log_state_change() const {
1148 if (LogCompilation) {
1149 if (xtty != NULL) {
1150 ttyLocker ttyl; // keep the following output all in one block
1151 if (_state == unloaded) {
1152 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'",
1153 os::current_thread_id());
1154 } else {
1155 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s",
1156 os::current_thread_id(),
1157 (_state == zombie ? " zombie='1'" : ""));
1158 }
1159 log_identity(xtty);
1160 xtty->stamp();
1161 xtty->end_elem();
1162 }
1163 }
1164
1165 const char *state_msg = _state == zombie ? "made zombie" : "made not entrant";
1166 CompileTask::print_ul(this, state_msg);
1167 if (PrintCompilation && _state != unloaded) {
1168 print_on(tty, state_msg);
1169 }
1170 }
1171
1172 void nmethod::unlink_from_method(bool acquire_lock) {
1173 // We need to check if both the _code and _from_compiled_code_entry_point
1174 // refer to this nmethod because there is a race in setting these two fields
1175 // in Method* as seen in bugid 4947125.
1176 // If the vep() points to the zombie nmethod, the memory for the nmethod
1177 // could be flushed and the compiler and vtable stubs could still call
1178 // through it.
1179 if (method() != NULL && (method()->code() == this ||
1180 method()->from_compiled_entry() == verified_entry_point())) {
1181 method()->clear_code(acquire_lock);
1182 }
1183 }
1184
1185 /**
1186 * Common functionality for both make_not_entrant and make_zombie
1187 */
1188 bool nmethod::make_not_entrant_or_zombie(int state) {
1189 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant");
1190 assert(!is_zombie(), "should not already be a zombie");
1191
1192 if (_state == state) {
1193 // Avoid taking the lock if already in required state.
1194 // This is safe from races because the state is an end-state,
1195 // which the nmethod cannot back out of once entered.
1196 // No need for fencing either.
1197 return false;
1198 }
1199
1200 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below.
1201 nmethodLocker nml(this);
1202 methodHandle the_method(method());
1203 // This can be called while the system is already at a safepoint which is ok
1204 NoSafepointVerifier nsv(true, !SafepointSynchronize::is_at_safepoint());
1205
1206 // during patching, depending on the nmethod state we must notify the GC that
1207 // code has been unloaded, unregistering it. We cannot do this right while
1208 // holding the Patching_lock because we need to use the CodeCache_lock. This
1209 // would be prone to deadlocks.
1210 // This flag is used to remember whether we need to later lock and unregister.
1211 bool nmethod_needs_unregister = false;
1212
1213 {
1214 // invalidate osr nmethod before acquiring the patching lock since
1215 // they both acquire leaf locks and we don't want a deadlock.
1216 // This logic is equivalent to the logic below for patching the
1217 // verified entry point of regular methods. We check that the
1218 // nmethod is in use to ensure that it is invalidated only once.
1219 if (is_osr_method() && is_in_use()) {
1220 // this effectively makes the osr nmethod not entrant
1221 invalidate_osr_method();
1222 }
1223
1224 // Enter critical section. Does not block for safepoint.
1225 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1226
1227 if (_state == state) {
1228 // another thread already performed this transition so nothing
1229 // to do, but return false to indicate this.
1230 return false;
1231 }
1232
1233 // The caller can be calling the method statically or through an inline
1234 // cache call.
1235 if (!is_osr_method() && !is_not_entrant()) {
1236 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
1237 SharedRuntime::get_handle_wrong_method_stub());
1238 }
1239
1240 if (is_in_use() && update_recompile_counts()) {
1241 // It's a true state change, so mark the method as decompiled.
1242 // Do it only for transition from alive.
1243 inc_decompile_count();
1244 }
1245
1246 // If the state is becoming a zombie, signal to unregister the nmethod with
1247 // the heap.
1248 // This nmethod may have already been unloaded during a full GC.
1249 if ((state == zombie) && !is_unloaded()) {
1250 nmethod_needs_unregister = true;
1251 }
1252
1253 // Must happen before state change. Otherwise we have a race condition in
1254 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately
1255 // transition its state from 'not_entrant' to 'zombie' without having to wait
1256 // for stack scanning.
1257 if (state == not_entrant) {
1258 mark_as_seen_on_stack();
1259 OrderAccess::storestore(); // _stack_traversal_mark and _state
1260 }
1261
1262 // Change state
1263 _state = state;
1264
1265 // Log the transition once
1266 log_state_change();
1267
1268 // Invalidate while holding the patching lock
1269 JVMCI_ONLY(maybe_invalidate_installed_code());
1270
1271 // Remove nmethod from method.
1272 unlink_from_method(false /* already owns Patching_lock */);
1273 } // leave critical region under Patching_lock
1274
1275 #ifdef ASSERT
1276 if (is_osr_method() && method() != NULL) {
1277 // Make sure osr nmethod is invalidated, i.e. not on the list
1278 bool found = method()->method_holder()->remove_osr_nmethod(this);
1279 assert(!found, "osr nmethod should have been invalidated");
1280 }
1281 #endif
1282
1283 // When the nmethod becomes zombie it is no longer alive so the
1284 // dependencies must be flushed. nmethods in the not_entrant
1285 // state will be flushed later when the transition to zombie
1286 // happens or they get unloaded.
1287 if (state == zombie) {
1288 {
1289 // Flushing dependencies must be done before any possible
1290 // safepoint can sneak in, otherwise the oops used by the
1291 // dependency logic could have become stale.
1292 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1293 if (nmethod_needs_unregister) {
1294 Universe::heap()->unregister_nmethod(this);
1295 }
1296 flush_dependencies(/*delete_immediately*/true);
1297 }
1298
1299 // Clear ICStubs to prevent back patching stubs of zombie or flushed
1300 // nmethods during the next safepoint (see ICStub::finalize), as well
1301 // as to free up CompiledICHolder resources.
1302 {
1303 CompiledICLocker ml(this);
1304 clear_ic_callsites();
1305 }
1306
1307 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload
1308 // event and it hasn't already been reported for this nmethod then
1309 // report it now. The event may have been reported earlier if the GC
1310 // marked it for unloading). JvmtiDeferredEventQueue support means
1311 // we no longer go to a safepoint here.
1312 post_compiled_method_unload();
1313
1314 #ifdef ASSERT
1315 // It's no longer safe to access the oops section since zombie
1316 // nmethods aren't scanned for GC.
1317 _oops_are_stale = true;
1318 #endif
1319 // the Method may be reclaimed by class unloading now that the
1320 // nmethod is in zombie state
1321 set_method(NULL);
1322 } else {
1323 assert(state == not_entrant, "other cases may need to be handled differently");
1324 }
1325
1326 if (TraceCreateZombies) {
1327 ResourceMark m;
1328 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");
1329 }
1330
1331 NMethodSweeper::report_state_change(this);
1332 return true;
1333 }
1334
1335 void nmethod::flush() {
1336 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1337 // Note that there are no valid oops in the nmethod anymore.
1338 assert(!is_osr_method() || is_unloaded() || is_zombie(),
1339 "osr nmethod must be unloaded or zombie before flushing");
1340 assert(is_zombie() || is_osr_method(), "must be a zombie method");
1341 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed");
1342 assert_locked_or_safepoint(CodeCache_lock);
1343
1344 // completely deallocate this method
1345 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, p2i(this));
1346 if (PrintMethodFlushing) {
1347 tty->print_cr("*flushing %s nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT
1348 "/Free CodeCache:" SIZE_FORMAT "Kb",
1349 is_osr_method() ? "osr" : "",_compile_id, p2i(this), CodeCache::blob_count(),
1350 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024);
1351 }
1352
1353 // We need to deallocate any ExceptionCache data.
1354 // Note that we do not need to grab the nmethod lock for this, it
1355 // better be thread safe if we're disposing of it!
1356 ExceptionCache* ec = exception_cache();
1357 set_exception_cache(NULL);
1358 while(ec != NULL) {
1359 ExceptionCache* next = ec->next();
1360 delete ec;
1361 ec = next;
1362 }
1363
1364 if (on_scavenge_root_list()) {
1365 CodeCache::drop_scavenge_root_nmethod(this);
1366 }
1367
1368 #if INCLUDE_JVMCI
1369 assert(_jvmci_installed_code == NULL, "should have been nulled out when transitioned to zombie");
1370 assert(_speculation_log == NULL, "should have been nulled out when transitioned to zombie");
1371 #endif
1372
1373 Universe::heap()->flush_nmethod(this);
1374
1375 CodeBlob::flush();
1376 CodeCache::free(this);
1377 }
1378
1379 oop nmethod::oop_at(int index) const {
1380 if (index == 0) {
1381 return NULL;
1382 }
1383 return NativeAccess<AS_NO_KEEPALIVE>::oop_load(oop_addr_at(index));
1384 }
1385
1386 //
1387 // Notify all classes this nmethod is dependent on that it is no
1388 // longer dependent. This should only be called in two situations.
1389 // First, when a nmethod transitions to a zombie all dependents need
1390 // to be clear. Since zombification happens at a safepoint there's no
1391 // synchronization issues. The second place is a little more tricky.
1392 // During phase 1 of mark sweep class unloading may happen and as a
1393 // result some nmethods may get unloaded. In this case the flushing
1394 // of dependencies must happen during phase 1 since after GC any
1395 // dependencies in the unloaded nmethod won't be updated, so
1396 // traversing the dependency information in unsafe. In that case this
1397 // function is called with a boolean argument and this function only
1398 // notifies instanceKlasses that are reachable
1399
1400 void nmethod::flush_dependencies(bool delete_immediately) {
1401 DEBUG_ONLY(bool called_by_gc = Universe::heap()->is_gc_active() || Thread::current()->is_ConcurrentGC_thread();)
1402 assert(called_by_gc != delete_immediately,
1403 "delete_immediately is false if and only if we are called during GC");
1404 if (!has_flushed_dependencies()) {
1405 set_has_flushed_dependencies();
1406 for (Dependencies::DepStream deps(this); deps.next(); ) {
1407 if (deps.type() == Dependencies::call_site_target_value) {
1408 // CallSite dependencies are managed on per-CallSite instance basis.
1409 oop call_site = deps.argument_oop(0);
1410 if (delete_immediately) {
1411 assert_locked_or_safepoint(CodeCache_lock);
1412 MethodHandles::remove_dependent_nmethod(call_site, this);
1413 } else {
1414 MethodHandles::clean_dependency_context(call_site);
1415 }
1416 } else {
1417 Klass* klass = deps.context_type();
1418 if (klass == NULL) {
1419 continue; // ignore things like evol_method
1420 }
1421 // During GC delete_immediately is false, and liveness
1422 // of dependee determines class that needs to be updated.
1423 if (delete_immediately) {
1424 assert_locked_or_safepoint(CodeCache_lock);
1425 InstanceKlass::cast(klass)->remove_dependent_nmethod(this);
1426 } else if (klass->is_loader_alive()) {
1427 // The GC may clean dependency contexts concurrently and in parallel.
1428 InstanceKlass::cast(klass)->clean_dependency_context();
1429 }
1430 }
1431 }
1432 }
1433 }
1434
1435 // ------------------------------------------------------------------
1436 // post_compiled_method_load_event
1437 // new method for install_code() path
1438 // Transfer information from compilation to jvmti
1439 void nmethod::post_compiled_method_load_event() {
1440
1441 Method* moop = method();
1442 HOTSPOT_COMPILED_METHOD_LOAD(
1443 (char *) moop->klass_name()->bytes(),
1444 moop->klass_name()->utf8_length(),
1445 (char *) moop->name()->bytes(),
1446 moop->name()->utf8_length(),
1447 (char *) moop->signature()->bytes(),
1448 moop->signature()->utf8_length(),
1449 insts_begin(), insts_size());
1450
1451 if (JvmtiExport::should_post_compiled_method_load() ||
1452 JvmtiExport::should_post_compiled_method_unload()) {
1453 get_and_cache_jmethod_id();
1454 }
1455
1456 if (JvmtiExport::should_post_compiled_method_load()) {
1457 // Let the Service thread (which is a real Java thread) post the event
1458 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1459 JvmtiDeferredEventQueue::enqueue(
1460 JvmtiDeferredEvent::compiled_method_load_event(this));
1461 }
1462 }
1463
1464 jmethodID nmethod::get_and_cache_jmethod_id() {
1465 if (_jmethod_id == NULL) {
1466 // Cache the jmethod_id since it can no longer be looked up once the
1467 // method itself has been marked for unloading.
1468 _jmethod_id = method()->jmethod_id();
1469 }
1470 return _jmethod_id;
1471 }
1472
1473 void nmethod::post_compiled_method_unload() {
1474 if (unload_reported()) {
1475 // During unloading we transition to unloaded and then to zombie
1476 // and the unloading is reported during the first transition.
1477 return;
1478 }
1479
1480 assert(_method != NULL && !is_unloaded(), "just checking");
1481 DTRACE_METHOD_UNLOAD_PROBE(method());
1482
1483 // If a JVMTI agent has enabled the CompiledMethodUnload event then
1484 // post the event. Sometime later this nmethod will be made a zombie
1485 // by the sweeper but the Method* will not be valid at that point.
1486 // If the _jmethod_id is null then no load event was ever requested
1487 // so don't bother posting the unload. The main reason for this is
1488 // that the jmethodID is a weak reference to the Method* so if
1489 // it's being unloaded there's no way to look it up since the weak
1490 // ref will have been cleared.
1491 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) {
1492 assert(!unload_reported(), "already unloaded");
1493 JvmtiDeferredEvent event =
1494 JvmtiDeferredEvent::compiled_method_unload_event(this,
1495 _jmethod_id, insts_begin());
1496 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1497 JvmtiDeferredEventQueue::enqueue(event);
1498 }
1499
1500 // The JVMTI CompiledMethodUnload event can be enabled or disabled at
1501 // any time. As the nmethod is being unloaded now we mark it has
1502 // having the unload event reported - this will ensure that we don't
1503 // attempt to report the event in the unlikely scenario where the
1504 // event is enabled at the time the nmethod is made a zombie.
1505 set_unload_reported();
1506 }
1507
1508 // Iterate over metadata calling this function. Used by RedefineClasses
1509 void nmethod::metadata_do(void f(Metadata*)) {
1510 {
1511 // Visit all immediate references that are embedded in the instruction stream.
1512 RelocIterator iter(this, oops_reloc_begin());
1513 while (iter.next()) {
1514 if (iter.type() == relocInfo::metadata_type ) {
1515 metadata_Relocation* r = iter.metadata_reloc();
1516 // In this metadata, we must only follow those metadatas directly embedded in
1517 // the code. Other metadatas (oop_index>0) are seen as part of
1518 // the metadata section below.
1519 assert(1 == (r->metadata_is_immediate()) +
1520 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
1521 "metadata must be found in exactly one place");
1522 if (r->metadata_is_immediate() && r->metadata_value() != NULL) {
1523 Metadata* md = r->metadata_value();
1524 if (md != _method) f(md);
1525 }
1526 } else if (iter.type() == relocInfo::virtual_call_type) {
1527 // Check compiledIC holders associated with this nmethod
1528 ResourceMark rm;
1529 CompiledIC *ic = CompiledIC_at(&iter);
1530 if (ic->is_icholder_call()) {
1531 CompiledICHolder* cichk = ic->cached_icholder();
1532 f(cichk->holder_metadata());
1533 f(cichk->holder_klass());
1534 } else {
1535 Metadata* ic_oop = ic->cached_metadata();
1536 if (ic_oop != NULL) {
1537 f(ic_oop);
1538 }
1539 }
1540 }
1541 }
1542 }
1543
1544 // Visit the metadata section
1545 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
1546 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops
1547 Metadata* md = *p;
1548 f(md);
1549 }
1550
1551 // Visit metadata not embedded in the other places.
1552 if (_method != NULL) f(_method);
1553 }
1554
1555 // The _is_unloading_state encodes a tuple comprising the unloading cycle
1556 // and the result of IsUnloadingBehaviour::is_unloading() fpr that cycle.
1557 // This is the bit layout of the _is_unloading_state byte: 00000CCU
1558 // CC refers to the cycle, which has 2 bits, and U refers to the result of
1559 // IsUnloadingBehaviour::is_unloading() for that unloading cycle.
1560
1561 class IsUnloadingState: public AllStatic {
1562 static const uint8_t _is_unloading_mask = 1;
1563 static const uint8_t _is_unloading_shift = 0;
1564 static const uint8_t _unloading_cycle_mask = 6;
1565 static const uint8_t _unloading_cycle_shift = 1;
1566
1567 static uint8_t set_is_unloading(uint8_t state, bool value) {
1568 state &= ~_is_unloading_mask;
1569 if (value) {
1570 state |= 1 << _is_unloading_shift;
1571 }
1572 assert(is_unloading(state) == value, "unexpected unloading cycle overflow");
1573 return state;
1574 }
1575
1576 static uint8_t set_unloading_cycle(uint8_t state, uint8_t value) {
1577 state &= ~_unloading_cycle_mask;
1578 state |= value << _unloading_cycle_shift;
1579 assert(unloading_cycle(state) == value, "unexpected unloading cycle overflow");
1580 return state;
1581 }
1582
1583 public:
1584 static bool is_unloading(uint8_t state) { return (state & _is_unloading_mask) >> _is_unloading_shift == 1; }
1585 static uint8_t unloading_cycle(uint8_t state) { return (state & _unloading_cycle_mask) >> _unloading_cycle_shift; }
1586
1587 static uint8_t create(bool is_unloading, uint8_t unloading_cycle) {
1588 uint8_t state = 0;
1589 state = set_is_unloading(state, is_unloading);
1590 state = set_unloading_cycle(state, unloading_cycle);
1591 return state;
1592 }
1593 };
1594
1595 bool nmethod::is_unloading() {
1596 uint8_t state = RawAccess<MO_RELAXED>::load(&_is_unloading_state);
1597 bool state_is_unloading = IsUnloadingState::is_unloading(state);
1598 uint8_t state_unloading_cycle = IsUnloadingState::unloading_cycle(state);
1599 if (state_is_unloading) {
1600 return true;
1601 }
1602 uint8_t current_cycle = CodeCache::unloading_cycle();
1603 if (state_unloading_cycle == current_cycle) {
1604 return false;
1605 }
1606
1607 // The IsUnloadingBehaviour is responsible for checking if there are any dead
1608 // oops in the CompiledMethod, by calling oops_do on it.
1609 state_unloading_cycle = current_cycle;
1610
1611 if (is_zombie()) {
1612 // Zombies without calculated unloading epoch are never unloading due to GC.
1613
1614 // There are no races where a previously observed is_unloading() nmethod
1615 // suddenly becomes not is_unloading() due to here being observed as zombie.
1616
1617 // With STW unloading, all is_alive() && is_unloading() nmethods are unlinked
1618 // and unloaded in the safepoint. That makes races where an nmethod is first
1619 // observed as is_alive() && is_unloading() and subsequently observed as
1620 // is_zombie() impossible.
1621
1622 // With concurrent unloading, all references to is_unloading() nmethods are
1623 // first unlinked (e.g. IC caches and dependency contexts). Then a global
1624 // handshake operation is performed with all JavaThreads before finally
1625 // unloading the nmethods. The sweeper never converts is_alive() && is_unloading()
1626 // nmethods to zombies; it waits for them to become is_unloaded(). So before
1627 // the global handshake, it is impossible for is_unloading() nmethods to
1628 // racingly become is_zombie(). And is_unloading() is calculated for all is_alive()
1629 // nmethods before taking that global handshake, meaning that it will never
1630 // be recalculated after the handshake.
1631
1632 // After that global handshake, is_unloading() nmethods are only observable
1633 // to the iterators, and they will never trigger recomputation of the cached
1634 // is_unloading_state, and hence may not suffer from such races.
1635
1636 state_is_unloading = false;
1637 } else {
1638 state_is_unloading = IsUnloadingBehaviour::current()->is_unloading(this);
1639 }
1640
1641 state = IsUnloadingState::create(state_is_unloading, state_unloading_cycle);
1642
1643 RawAccess<MO_RELAXED>::store(&_is_unloading_state, state);
1644
1645 return state_is_unloading;
1646 }
1647
1648 void nmethod::clear_unloading_state() {
1649 uint8_t state = IsUnloadingState::create(false, CodeCache::unloading_cycle());
1650 RawAccess<MO_RELAXED>::store(&_is_unloading_state, state);
1651 }
1652
1653
1654 // This is called at the end of the strong tracing/marking phase of a
1655 // GC to unload an nmethod if it contains otherwise unreachable
1656 // oops.
1657
1658 void nmethod::do_unloading(bool unloading_occurred) {
1659 // Make sure the oop's ready to receive visitors
1660 assert(!is_zombie() && !is_unloaded(),
1661 "should not call follow on zombie or unloaded nmethod");
1662
1663 if (is_unloading()) {
1664 make_unloaded();
1665 } else {
1666 #if INCLUDE_JVMCI
1667 if (_jvmci_installed_code != NULL) {
1668 if (JNIHandles::is_global_weak_cleared(_jvmci_installed_code)) {
1669 if (_jvmci_installed_code_triggers_invalidation) {
1670 make_not_entrant();
1671 }
1672 clear_jvmci_installed_code();
1673 }
1674 }
1675 #endif
1676
1677 guarantee(unload_nmethod_caches(unloading_occurred),
1678 "Should not need transition stubs");
1679 }
1680 }
1681
1682 void nmethod::oops_do(OopClosure* f, bool allow_zombie) {
1683 // make sure the oops ready to receive visitors
1684 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod");
1685 assert(!is_unloaded(), "should not call follow on unloaded nmethod");
1686
1687 // Prevent extra code cache walk for platforms that don't have immediate oops.
1688 if (relocInfo::mustIterateImmediateOopsInCode()) {
1689 RelocIterator iter(this, oops_reloc_begin());
1690
1691 while (iter.next()) {
1692 if (iter.type() == relocInfo::oop_type ) {
1693 oop_Relocation* r = iter.oop_reloc();
1694 // In this loop, we must only follow those oops directly embedded in
1695 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1696 assert(1 == (r->oop_is_immediate()) +
1697 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1698 "oop must be found in exactly one place");
1699 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1700 f->do_oop(r->oop_addr());
1701 }
1702 }
1703 }
1704 }
1705
1706 // Scopes
1707 // This includes oop constants not inlined in the code stream.
1708 for (oop* p = oops_begin(); p < oops_end(); p++) {
1709 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1710 f->do_oop(p);
1711 }
1712 }
1713
1714 #define NMETHOD_SENTINEL ((nmethod*)badAddress)
1715
1716 nmethod* volatile nmethod::_oops_do_mark_nmethods;
1717
1718 // An nmethod is "marked" if its _mark_link is set non-null.
1719 // Even if it is the end of the linked list, it will have a non-null link value,
1720 // as long as it is on the list.
1721 // This code must be MP safe, because it is used from parallel GC passes.
1722 bool nmethod::test_set_oops_do_mark() {
1723 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");
1724 if (_oops_do_mark_link == NULL) {
1725 // Claim this nmethod for this thread to mark.
1726 if (Atomic::replace_if_null(NMETHOD_SENTINEL, &_oops_do_mark_link)) {
1727 // Atomically append this nmethod (now claimed) to the head of the list:
1728 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods;
1729 for (;;) {
1730 nmethod* required_mark_nmethods = observed_mark_nmethods;
1731 _oops_do_mark_link = required_mark_nmethods;
1732 observed_mark_nmethods =
1733 Atomic::cmpxchg(this, &_oops_do_mark_nmethods, required_mark_nmethods);
1734 if (observed_mark_nmethods == required_mark_nmethods)
1735 break;
1736 }
1737 // Mark was clear when we first saw this guy.
1738 LogTarget(Trace, gc, nmethod) lt;
1739 if (lt.is_enabled()) {
1740 LogStream ls(lt);
1741 CompileTask::print(&ls, this, "oops_do, mark", /*short_form:*/ true);
1742 }
1743 return false;
1744 }
1745 }
1746 // On fall through, another racing thread marked this nmethod before we did.
1747 return true;
1748 }
1749
1750 void nmethod::oops_do_marking_prologue() {
1751 log_trace(gc, nmethod)("oops_do_marking_prologue");
1752 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row");
1753 // We use cmpxchg instead of regular assignment here because the user
1754 // may fork a bunch of threads, and we need them all to see the same state.
1755 nmethod* observed = Atomic::cmpxchg(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, (nmethod*)NULL);
1756 guarantee(observed == NULL, "no races in this sequential code");
1757 }
1758
1759 void nmethod::oops_do_marking_epilogue() {
1760 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row");
1761 nmethod* cur = _oops_do_mark_nmethods;
1762 while (cur != NMETHOD_SENTINEL) {
1763 assert(cur != NULL, "not NULL-terminated");
1764 nmethod* next = cur->_oops_do_mark_link;
1765 cur->_oops_do_mark_link = NULL;
1766 DEBUG_ONLY(cur->verify_oop_relocations());
1767
1768 LogTarget(Trace, gc, nmethod) lt;
1769 if (lt.is_enabled()) {
1770 LogStream ls(lt);
1771 CompileTask::print(&ls, cur, "oops_do, unmark", /*short_form:*/ true);
1772 }
1773 cur = next;
1774 }
1775 nmethod* required = _oops_do_mark_nmethods;
1776 nmethod* observed = Atomic::cmpxchg((nmethod*)NULL, &_oops_do_mark_nmethods, required);
1777 guarantee(observed == required, "no races in this sequential code");
1778 log_trace(gc, nmethod)("oops_do_marking_epilogue");
1779 }
1780
1781 class DetectScavengeRoot: public OopClosure {
1782 bool _detected_scavenge_root;
1783 nmethod* _print_nm;
1784 public:
1785 DetectScavengeRoot(nmethod* nm) : _detected_scavenge_root(false), _print_nm(nm) {}
1786
1787 bool detected_scavenge_root() { return _detected_scavenge_root; }
1788 virtual void do_oop(oop* p) {
1789 if ((*p) != NULL && Universe::heap()->is_scavengable(*p)) {
1790 NOT_PRODUCT(maybe_print(p));
1791 _detected_scavenge_root = true;
1792 }
1793 }
1794 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
1795
1796 #ifndef PRODUCT
1797 void maybe_print(oop* p) {
1798 LogTarget(Trace, gc, nmethod) lt;
1799 if (lt.is_enabled()) {
1800 LogStream ls(lt);
1801 if (!_detected_scavenge_root) {
1802 CompileTask::print(&ls, _print_nm, "new scavenge root", /*short_form:*/ true);
1803 }
1804 ls.print("" PTR_FORMAT "[offset=%d] detected scavengable oop " PTR_FORMAT " (found at " PTR_FORMAT ") ",
1805 p2i(_print_nm), (int)((intptr_t)p - (intptr_t)_print_nm),
1806 p2i(*p), p2i(p));
1807 ls.cr();
1808 }
1809 }
1810 #endif //PRODUCT
1811 };
1812
1813 bool nmethod::detect_scavenge_root_oops() {
1814 DetectScavengeRoot detect_scavenge_root(this);
1815 oops_do(&detect_scavenge_root);
1816 return detect_scavenge_root.detected_scavenge_root();
1817 }
1818
1819 inline bool includes(void* p, void* from, void* to) {
1820 return from <= p && p < to;
1821 }
1822
1823
1824 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
1825 assert(count >= 2, "must be sentinel values, at least");
1826
1827 #ifdef ASSERT
1828 // must be sorted and unique; we do a binary search in find_pc_desc()
1829 int prev_offset = pcs[0].pc_offset();
1830 assert(prev_offset == PcDesc::lower_offset_limit,
1831 "must start with a sentinel");
1832 for (int i = 1; i < count; i++) {
1833 int this_offset = pcs[i].pc_offset();
1834 assert(this_offset > prev_offset, "offsets must be sorted");
1835 prev_offset = this_offset;
1836 }
1837 assert(prev_offset == PcDesc::upper_offset_limit,
1838 "must end with a sentinel");
1839 #endif //ASSERT
1840
1841 // Search for MethodHandle invokes and tag the nmethod.
1842 for (int i = 0; i < count; i++) {
1843 if (pcs[i].is_method_handle_invoke()) {
1844 set_has_method_handle_invokes(true);
1845 break;
1846 }
1847 }
1848 assert(has_method_handle_invokes() == (_deopt_mh_handler_begin != NULL), "must have deopt mh handler");
1849
1850 int size = count * sizeof(PcDesc);
1851 assert(scopes_pcs_size() >= size, "oob");
1852 memcpy(scopes_pcs_begin(), pcs, size);
1853
1854 // Adjust the final sentinel downward.
1855 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
1856 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
1857 last_pc->set_pc_offset(content_size() + 1);
1858 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
1859 // Fill any rounding gaps with copies of the last record.
1860 last_pc[1] = last_pc[0];
1861 }
1862 // The following assert could fail if sizeof(PcDesc) is not
1863 // an integral multiple of oopSize (the rounding term).
1864 // If it fails, change the logic to always allocate a multiple
1865 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
1866 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
1867 }
1868
1869 void nmethod::copy_scopes_data(u_char* buffer, int size) {
1870 assert(scopes_data_size() >= size, "oob");
1871 memcpy(scopes_data_begin(), buffer, size);
1872 }
1873
1874 #ifdef ASSERT
1875 static PcDesc* linear_search(const PcDescSearch& search, int pc_offset, bool approximate) {
1876 PcDesc* lower = search.scopes_pcs_begin();
1877 PcDesc* upper = search.scopes_pcs_end();
1878 lower += 1; // exclude initial sentinel
1879 PcDesc* res = NULL;
1880 for (PcDesc* p = lower; p < upper; p++) {
1881 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc
1882 if (match_desc(p, pc_offset, approximate)) {
1883 if (res == NULL)
1884 res = p;
1885 else
1886 res = (PcDesc*) badAddress;
1887 }
1888 }
1889 return res;
1890 }
1891 #endif
1892
1893
1894 // Finds a PcDesc with real-pc equal to "pc"
1895 PcDesc* PcDescContainer::find_pc_desc_internal(address pc, bool approximate, const PcDescSearch& search) {
1896 address base_address = search.code_begin();
1897 if ((pc < base_address) ||
1898 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
1899 return NULL; // PC is wildly out of range
1900 }
1901 int pc_offset = (int) (pc - base_address);
1902
1903 // Check the PcDesc cache if it contains the desired PcDesc
1904 // (This as an almost 100% hit rate.)
1905 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
1906 if (res != NULL) {
1907 assert(res == linear_search(search, pc_offset, approximate), "cache ok");
1908 return res;
1909 }
1910
1911 // Fallback algorithm: quasi-linear search for the PcDesc
1912 // Find the last pc_offset less than the given offset.
1913 // The successor must be the required match, if there is a match at all.
1914 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
1915 PcDesc* lower = search.scopes_pcs_begin();
1916 PcDesc* upper = search.scopes_pcs_end();
1917 upper -= 1; // exclude final sentinel
1918 if (lower >= upper) return NULL; // native method; no PcDescs at all
1919
1920 #define assert_LU_OK \
1921 /* invariant on lower..upper during the following search: */ \
1922 assert(lower->pc_offset() < pc_offset, "sanity"); \
1923 assert(upper->pc_offset() >= pc_offset, "sanity")
1924 assert_LU_OK;
1925
1926 // Use the last successful return as a split point.
1927 PcDesc* mid = _pc_desc_cache.last_pc_desc();
1928 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1929 if (mid->pc_offset() < pc_offset) {
1930 lower = mid;
1931 } else {
1932 upper = mid;
1933 }
1934
1935 // Take giant steps at first (4096, then 256, then 16, then 1)
1936 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
1937 const int RADIX = (1 << LOG2_RADIX);
1938 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
1939 while ((mid = lower + step) < upper) {
1940 assert_LU_OK;
1941 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1942 if (mid->pc_offset() < pc_offset) {
1943 lower = mid;
1944 } else {
1945 upper = mid;
1946 break;
1947 }
1948 }
1949 assert_LU_OK;
1950 }
1951
1952 // Sneak up on the value with a linear search of length ~16.
1953 while (true) {
1954 assert_LU_OK;
1955 mid = lower + 1;
1956 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1957 if (mid->pc_offset() < pc_offset) {
1958 lower = mid;
1959 } else {
1960 upper = mid;
1961 break;
1962 }
1963 }
1964 #undef assert_LU_OK
1965
1966 if (match_desc(upper, pc_offset, approximate)) {
1967 assert(upper == linear_search(search, pc_offset, approximate), "search ok");
1968 _pc_desc_cache.add_pc_desc(upper);
1969 return upper;
1970 } else {
1971 assert(NULL == linear_search(search, pc_offset, approximate), "search ok");
1972 return NULL;
1973 }
1974 }
1975
1976
1977 void nmethod::check_all_dependencies(DepChange& changes) {
1978 // Checked dependencies are allocated into this ResourceMark
1979 ResourceMark rm;
1980
1981 // Turn off dependency tracing while actually testing dependencies.
1982 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) );
1983
1984 typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash,
1985 &DependencySignature::equals, 11027> DepTable;
1986
1987 DepTable* table = new DepTable();
1988
1989 // Iterate over live nmethods and check dependencies of all nmethods that are not
1990 // marked for deoptimization. A particular dependency is only checked once.
1991 NMethodIterator iter(NMethodIterator::only_alive_and_not_unloading);
1992 while(iter.next()) {
1993 nmethod* nm = iter.method();
1994 // Only notify for live nmethods
1995 if (!nm->is_marked_for_deoptimization()) {
1996 for (Dependencies::DepStream deps(nm); deps.next(); ) {
1997 // Construct abstraction of a dependency.
1998 DependencySignature* current_sig = new DependencySignature(deps);
1999
2000 // Determine if dependency is already checked. table->put(...) returns
2001 // 'true' if the dependency is added (i.e., was not in the hashtable).
2002 if (table->put(*current_sig, 1)) {
2003 if (deps.check_dependency() != NULL) {
2004 // Dependency checking failed. Print out information about the failed
2005 // dependency and finally fail with an assert. We can fail here, since
2006 // dependency checking is never done in a product build.
2007 tty->print_cr("Failed dependency:");
2008 changes.print();
2009 nm->print();
2010 nm->print_dependencies();
2011 assert(false, "Should have been marked for deoptimization");
2012 }
2013 }
2014 }
2015 }
2016 }
2017 }
2018
2019 bool nmethod::check_dependency_on(DepChange& changes) {
2020 // What has happened:
2021 // 1) a new class dependee has been added
2022 // 2) dependee and all its super classes have been marked
2023 bool found_check = false; // set true if we are upset
2024 for (Dependencies::DepStream deps(this); deps.next(); ) {
2025 // Evaluate only relevant dependencies.
2026 if (deps.spot_check_dependency_at(changes) != NULL) {
2027 found_check = true;
2028 NOT_DEBUG(break);
2029 }
2030 }
2031 return found_check;
2032 }
2033
2034 bool nmethod::is_evol_dependent() {
2035 for (Dependencies::DepStream deps(this); deps.next(); ) {
2036 if (deps.type() == Dependencies::evol_method) {
2037 Method* method = deps.method_argument(0);
2038 if (method->is_old()) {
2039 if (log_is_enabled(Debug, redefine, class, nmethod)) {
2040 ResourceMark rm;
2041 log_debug(redefine, class, nmethod)
2042 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)",
2043 _method->method_holder()->external_name(),
2044 _method->name()->as_C_string(),
2045 _method->signature()->as_C_string(),
2046 compile_id(),
2047 method->method_holder()->external_name(),
2048 method->name()->as_C_string(),
2049 method->signature()->as_C_string());
2050 }
2051 if (TraceDependencies || LogCompilation)
2052 deps.log_dependency(method->method_holder());
2053 return true;
2054 }
2055 }
2056 }
2057 return false;
2058 }
2059
2060 // Called from mark_for_deoptimization, when dependee is invalidated.
2061 bool nmethod::is_dependent_on_method(Method* dependee) {
2062 for (Dependencies::DepStream deps(this); deps.next(); ) {
2063 if (deps.type() != Dependencies::evol_method)
2064 continue;
2065 Method* method = deps.method_argument(0);
2066 if (method == dependee) return true;
2067 }
2068 return false;
2069 }
2070
2071
2072 bool nmethod::is_patchable_at(address instr_addr) {
2073 assert(insts_contains(instr_addr), "wrong nmethod used");
2074 if (is_zombie()) {
2075 // a zombie may never be patched
2076 return false;
2077 }
2078 return true;
2079 }
2080
2081
2082 address nmethod::continuation_for_implicit_exception(address pc) {
2083 // Exception happened outside inline-cache check code => we are inside
2084 // an active nmethod => use cpc to determine a return address
2085 int exception_offset = pc - code_begin();
2086 int cont_offset = ImplicitExceptionTable(this).at( exception_offset );
2087 #ifdef ASSERT
2088 if (cont_offset == 0) {
2089 Thread* thread = Thread::current();
2090 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
2091 HandleMark hm(thread);
2092 ResourceMark rm(thread);
2093 CodeBlob* cb = CodeCache::find_blob(pc);
2094 assert(cb != NULL && cb == this, "");
2095 ttyLocker ttyl;
2096 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, p2i(pc));
2097 print();
2098 method()->print_codes();
2099 print_code();
2100 print_pcs();
2101 }
2102 #endif
2103 if (cont_offset == 0) {
2104 // Let the normal error handling report the exception
2105 return NULL;
2106 }
2107 return code_begin() + cont_offset;
2108 }
2109
2110
2111
2112 void nmethod_init() {
2113 // make sure you didn't forget to adjust the filler fields
2114 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
2115 }
2116
2117
2118 //-------------------------------------------------------------------------------------------
2119
2120
2121 // QQQ might we make this work from a frame??
2122 nmethodLocker::nmethodLocker(address pc) {
2123 CodeBlob* cb = CodeCache::find_blob(pc);
2124 guarantee(cb != NULL && cb->is_compiled(), "bad pc for a nmethod found");
2125 _nm = cb->as_compiled_method();
2126 lock_nmethod(_nm);
2127 }
2128
2129 // Only JvmtiDeferredEvent::compiled_method_unload_event()
2130 // should pass zombie_ok == true.
2131 void nmethodLocker::lock_nmethod(CompiledMethod* cm, bool zombie_ok) {
2132 if (cm == NULL) return;
2133 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method
2134 nmethod* nm = cm->as_nmethod();
2135 Atomic::inc(&nm->_lock_count);
2136 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method");
2137 }
2138
2139 void nmethodLocker::unlock_nmethod(CompiledMethod* cm) {
2140 if (cm == NULL) return;
2141 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method
2142 nmethod* nm = cm->as_nmethod();
2143 Atomic::dec(&nm->_lock_count);
2144 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock");
2145 }
2146
2147
2148 // -----------------------------------------------------------------------------
2149 // Verification
2150
2151 class VerifyOopsClosure: public OopClosure {
2152 nmethod* _nm;
2153 bool _ok;
2154 public:
2155 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
2156 bool ok() { return _ok; }
2157 virtual void do_oop(oop* p) {
2158 if (oopDesc::is_oop_or_null(*p)) return;
2159 if (_ok) {
2160 _nm->print_nmethod(true);
2161 _ok = false;
2162 }
2163 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2164 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2165 }
2166 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2167 };
2168
2169 void nmethod::verify() {
2170
2171 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant
2172 // seems odd.
2173
2174 if (is_zombie() || is_not_entrant() || is_unloaded())
2175 return;
2176
2177 // Make sure all the entry points are correctly aligned for patching.
2178 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
2179
2180 // assert(oopDesc::is_oop(method()), "must be valid");
2181
2182 ResourceMark rm;
2183
2184 if (!CodeCache::contains(this)) {
2185 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this));
2186 }
2187
2188 if(is_native_method() )
2189 return;
2190
2191 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
2192 if (nm != this) {
2193 fatal("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this));
2194 }
2195
2196 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2197 if (! p->verify(this)) {
2198 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this));
2199 }
2200 }
2201
2202 VerifyOopsClosure voc(this);
2203 oops_do(&voc);
2204 assert(voc.ok(), "embedded oops must be OK");
2205 Universe::heap()->verify_nmethod(this);
2206
2207 verify_scopes();
2208 }
2209
2210
2211 void nmethod::verify_interrupt_point(address call_site) {
2212 // Verify IC only when nmethod installation is finished.
2213 if (!is_not_installed()) {
2214 if (CompiledICLocker::is_safe(this)) {
2215 CompiledIC_at(this, call_site);
2216 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
2217 } else {
2218 CompiledICLocker ml_verify(this);
2219 CompiledIC_at(this, call_site);
2220 }
2221 }
2222
2223 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address());
2224 assert(pd != NULL, "PcDesc must exist");
2225 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(),
2226 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(),
2227 pd->return_oop());
2228 !sd->is_top(); sd = sd->sender()) {
2229 sd->verify();
2230 }
2231 }
2232
2233 void nmethod::verify_scopes() {
2234 if( !method() ) return; // Runtime stubs have no scope
2235 if (method()->is_native()) return; // Ignore stub methods.
2236 // iterate through all interrupt point
2237 // and verify the debug information is valid.
2238 RelocIterator iter((nmethod*)this);
2239 while (iter.next()) {
2240 address stub = NULL;
2241 switch (iter.type()) {
2242 case relocInfo::virtual_call_type:
2243 verify_interrupt_point(iter.addr());
2244 break;
2245 case relocInfo::opt_virtual_call_type:
2246 stub = iter.opt_virtual_call_reloc()->static_stub(false);
2247 verify_interrupt_point(iter.addr());
2248 break;
2249 case relocInfo::static_call_type:
2250 stub = iter.static_call_reloc()->static_stub(false);
2251 //verify_interrupt_point(iter.addr());
2252 break;
2253 case relocInfo::runtime_call_type:
2254 case relocInfo::runtime_call_w_cp_type: {
2255 address destination = iter.reloc()->value();
2256 // Right now there is no way to find out which entries support
2257 // an interrupt point. It would be nice if we had this
2258 // information in a table.
2259 break;
2260 }
2261 default:
2262 break;
2263 }
2264 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section");
2265 }
2266 }
2267
2268
2269 // -----------------------------------------------------------------------------
2270 // Non-product code
2271 #ifndef PRODUCT
2272
2273 class DebugScavengeRoot: public OopClosure {
2274 nmethod* _nm;
2275 bool _ok;
2276 public:
2277 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { }
2278 bool ok() { return _ok; }
2279 virtual void do_oop(oop* p) {
2280 if ((*p) == NULL || !Universe::heap()->is_scavengable(*p)) return;
2281 if (_ok) {
2282 _nm->print_nmethod(true);
2283 _ok = false;
2284 }
2285 tty->print_cr("*** scavengable oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2286 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2287 (*p)->print();
2288 }
2289 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2290 };
2291
2292 void nmethod::verify_scavenge_root_oops() {
2293 if (!on_scavenge_root_list()) {
2294 // Actually look inside, to verify the claim that it's clean.
2295 DebugScavengeRoot debug_scavenge_root(this);
2296 oops_do(&debug_scavenge_root);
2297 if (!debug_scavenge_root.ok())
2298 fatal("found an unadvertised bad scavengable oop in the code cache");
2299 }
2300 assert(scavenge_root_not_marked(), "");
2301 }
2302
2303 #endif // PRODUCT
2304
2305 // Printing operations
2306
2307 void nmethod::print() const {
2308 ResourceMark rm;
2309 ttyLocker ttyl; // keep the following output all in one block
2310
2311 tty->print("Compiled method ");
2312
2313 if (is_compiled_by_c1()) {
2314 tty->print("(c1) ");
2315 } else if (is_compiled_by_c2()) {
2316 tty->print("(c2) ");
2317 } else if (is_compiled_by_jvmci()) {
2318 tty->print("(JVMCI) ");
2319 } else {
2320 tty->print("(nm) ");
2321 }
2322
2323 print_on(tty, NULL);
2324
2325 if (WizardMode) {
2326 tty->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this));
2327 tty->print(" for method " INTPTR_FORMAT , p2i(method()));
2328 tty->print(" { ");
2329 tty->print_cr("%s ", state());
2330 if (on_scavenge_root_list()) tty->print("scavenge_root ");
2331 tty->print_cr("}:");
2332 }
2333 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2334 p2i(this),
2335 p2i(this) + size(),
2336 size());
2337 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2338 p2i(relocation_begin()),
2339 p2i(relocation_end()),
2340 relocation_size());
2341 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2342 p2i(consts_begin()),
2343 p2i(consts_end()),
2344 consts_size());
2345 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2346 p2i(insts_begin()),
2347 p2i(insts_end()),
2348 insts_size());
2349 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2350 p2i(stub_begin()),
2351 p2i(stub_end()),
2352 stub_size());
2353 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2354 p2i(oops_begin()),
2355 p2i(oops_end()),
2356 oops_size());
2357 if (metadata_size () > 0) tty->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2358 p2i(metadata_begin()),
2359 p2i(metadata_end()),
2360 metadata_size());
2361 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2362 p2i(scopes_data_begin()),
2363 p2i(scopes_data_end()),
2364 scopes_data_size());
2365 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2366 p2i(scopes_pcs_begin()),
2367 p2i(scopes_pcs_end()),
2368 scopes_pcs_size());
2369 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2370 p2i(dependencies_begin()),
2371 p2i(dependencies_end()),
2372 dependencies_size());
2373 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2374 p2i(handler_table_begin()),
2375 p2i(handler_table_end()),
2376 handler_table_size());
2377 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2378 p2i(nul_chk_table_begin()),
2379 p2i(nul_chk_table_end()),
2380 nul_chk_table_size());
2381 }
2382
2383 #ifndef PRODUCT
2384
2385 void nmethod::print_scopes() {
2386 // Find the first pc desc for all scopes in the code and print it.
2387 ResourceMark rm;
2388 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2389 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
2390 continue;
2391
2392 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
2393 while (sd != NULL) {
2394 sd->print_on(tty, p);
2395 sd = sd->sender();
2396 }
2397 }
2398 }
2399
2400 void nmethod::print_dependencies() {
2401 ResourceMark rm;
2402 ttyLocker ttyl; // keep the following output all in one block
2403 tty->print_cr("Dependencies:");
2404 for (Dependencies::DepStream deps(this); deps.next(); ) {
2405 deps.print_dependency();
2406 Klass* ctxk = deps.context_type();
2407 if (ctxk != NULL) {
2408 if (ctxk->is_instance_klass() && InstanceKlass::cast(ctxk)->is_dependent_nmethod(this)) {
2409 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name());
2410 }
2411 }
2412 deps.log_dependency(); // put it into the xml log also
2413 }
2414 }
2415
2416
2417 void nmethod::print_relocations() {
2418 ResourceMark m; // in case methods get printed via the debugger
2419 tty->print_cr("relocations:");
2420 RelocIterator iter(this);
2421 iter.print();
2422 }
2423
2424
2425 void nmethod::print_pcs() {
2426 ResourceMark m; // in case methods get printed via debugger
2427 tty->print_cr("pc-bytecode offsets:");
2428 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2429 p->print(this);
2430 }
2431 }
2432
2433 void nmethod::print_recorded_oops() {
2434 tty->print_cr("Recorded oops:");
2435 for (int i = 0; i < oops_count(); i++) {
2436 oop o = oop_at(i);
2437 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(o));
2438 if (o == Universe::non_oop_word()) {
2439 tty->print("non-oop word");
2440 } else {
2441 if (o != NULL) {
2442 o->print_value();
2443 } else {
2444 tty->print_cr("NULL");
2445 }
2446 }
2447 tty->cr();
2448 }
2449 }
2450
2451 void nmethod::print_recorded_metadata() {
2452 tty->print_cr("Recorded metadata:");
2453 for (int i = 0; i < metadata_count(); i++) {
2454 Metadata* m = metadata_at(i);
2455 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(m));
2456 if (m == (Metadata*)Universe::non_oop_word()) {
2457 tty->print("non-metadata word");
2458 } else {
2459 Metadata::print_value_on_maybe_null(tty, m);
2460 }
2461 tty->cr();
2462 }
2463 }
2464
2465 #endif // PRODUCT
2466
2467 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
2468 RelocIterator iter(this, begin, end);
2469 bool have_one = false;
2470 while (iter.next()) {
2471 have_one = true;
2472 switch (iter.type()) {
2473 case relocInfo::none: return "no_reloc";
2474 case relocInfo::oop_type: {
2475 stringStream st;
2476 oop_Relocation* r = iter.oop_reloc();
2477 oop obj = r->oop_value();
2478 st.print("oop(");
2479 if (obj == NULL) st.print("NULL");
2480 else obj->print_value_on(&st);
2481 st.print(")");
2482 return st.as_string();
2483 }
2484 case relocInfo::metadata_type: {
2485 stringStream st;
2486 metadata_Relocation* r = iter.metadata_reloc();
2487 Metadata* obj = r->metadata_value();
2488 st.print("metadata(");
2489 if (obj == NULL) st.print("NULL");
2490 else obj->print_value_on(&st);
2491 st.print(")");
2492 return st.as_string();
2493 }
2494 case relocInfo::runtime_call_type:
2495 case relocInfo::runtime_call_w_cp_type: {
2496 stringStream st;
2497 st.print("runtime_call");
2498 CallRelocation* r = (CallRelocation*)iter.reloc();
2499 address dest = r->destination();
2500 CodeBlob* cb = CodeCache::find_blob(dest);
2501 if (cb != NULL) {
2502 st.print(" %s", cb->name());
2503 } else {
2504 ResourceMark rm;
2505 const int buflen = 1024;
2506 char* buf = NEW_RESOURCE_ARRAY(char, buflen);
2507 int offset;
2508 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) {
2509 st.print(" %s", buf);
2510 if (offset != 0) {
2511 st.print("+%d", offset);
2512 }
2513 }
2514 }
2515 return st.as_string();
2516 }
2517 case relocInfo::virtual_call_type: {
2518 stringStream st;
2519 st.print_raw("virtual_call");
2520 virtual_call_Relocation* r = iter.virtual_call_reloc();
2521 Method* m = r->method_value();
2522 if (m != NULL) {
2523 assert(m->is_method(), "");
2524 m->print_short_name(&st);
2525 }
2526 return st.as_string();
2527 }
2528 case relocInfo::opt_virtual_call_type: {
2529 stringStream st;
2530 st.print_raw("optimized virtual_call");
2531 opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc();
2532 Method* m = r->method_value();
2533 if (m != NULL) {
2534 assert(m->is_method(), "");
2535 m->print_short_name(&st);
2536 }
2537 return st.as_string();
2538 }
2539 case relocInfo::static_call_type: {
2540 stringStream st;
2541 st.print_raw("static_call");
2542 static_call_Relocation* r = iter.static_call_reloc();
2543 Method* m = r->method_value();
2544 if (m != NULL) {
2545 assert(m->is_method(), "");
2546 m->print_short_name(&st);
2547 }
2548 return st.as_string();
2549 }
2550 case relocInfo::static_stub_type: return "static_stub";
2551 case relocInfo::external_word_type: return "external_word";
2552 case relocInfo::internal_word_type: return "internal_word";
2553 case relocInfo::section_word_type: return "section_word";
2554 case relocInfo::poll_type: return "poll";
2555 case relocInfo::poll_return_type: return "poll_return";
2556 case relocInfo::trampoline_stub_type: return "trampoline_stub";
2557 case relocInfo::type_mask: return "type_bit_mask";
2558
2559 default:
2560 break;
2561 }
2562 }
2563 return have_one ? "other" : NULL;
2564 }
2565
2566 // Return a the last scope in (begin..end]
2567 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
2568 PcDesc* p = pc_desc_near(begin+1);
2569 if (p != NULL && p->real_pc(this) <= end) {
2570 return new ScopeDesc(this, p->scope_decode_offset(),
2571 p->obj_decode_offset(), p->should_reexecute(), p->rethrow_exception(),
2572 p->return_oop());
2573 }
2574 return NULL;
2575 }
2576
2577 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const {
2578 if (block_begin == entry_point()) stream->print_cr("[Entry Point]");
2579 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]");
2580 if (JVMCI_ONLY(_exception_offset >= 0 &&) block_begin == exception_begin()) stream->print_cr("[Exception Handler]");
2581 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]");
2582 if (JVMCI_ONLY(_deopt_handler_begin != NULL &&) block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]");
2583
2584 if (has_method_handle_invokes())
2585 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]");
2586
2587 if (block_begin == consts_begin()) stream->print_cr("[Constants]");
2588
2589 if (block_begin == entry_point()) {
2590 methodHandle m = method();
2591 if (m.not_null()) {
2592 stream->print(" # ");
2593 m->print_value_on(stream);
2594 stream->cr();
2595 }
2596 if (m.not_null() && !is_osr_method()) {
2597 ResourceMark rm;
2598 int sizeargs = m->size_of_parameters();
2599 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
2600 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
2601 {
2602 int sig_index = 0;
2603 if (!m->is_static())
2604 sig_bt[sig_index++] = T_OBJECT; // 'this'
2605 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) {
2606 BasicType t = ss.type();
2607 sig_bt[sig_index++] = t;
2608 if (type2size[t] == 2) {
2609 sig_bt[sig_index++] = T_VOID;
2610 } else {
2611 assert(type2size[t] == 1, "size is 1 or 2");
2612 }
2613 }
2614 assert(sig_index == sizeargs, "");
2615 }
2616 const char* spname = "sp"; // make arch-specific?
2617 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false);
2618 int stack_slot_offset = this->frame_size() * wordSize;
2619 int tab1 = 14, tab2 = 24;
2620 int sig_index = 0;
2621 int arg_index = (m->is_static() ? 0 : -1);
2622 bool did_old_sp = false;
2623 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) {
2624 bool at_this = (arg_index == -1);
2625 bool at_old_sp = false;
2626 BasicType t = (at_this ? T_OBJECT : ss.type());
2627 assert(t == sig_bt[sig_index], "sigs in sync");
2628 if (at_this)
2629 stream->print(" # this: ");
2630 else
2631 stream->print(" # parm%d: ", arg_index);
2632 stream->move_to(tab1);
2633 VMReg fst = regs[sig_index].first();
2634 VMReg snd = regs[sig_index].second();
2635 if (fst->is_reg()) {
2636 stream->print("%s", fst->name());
2637 if (snd->is_valid()) {
2638 stream->print(":%s", snd->name());
2639 }
2640 } else if (fst->is_stack()) {
2641 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
2642 if (offset == stack_slot_offset) at_old_sp = true;
2643 stream->print("[%s+0x%x]", spname, offset);
2644 } else {
2645 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
2646 }
2647 stream->print(" ");
2648 stream->move_to(tab2);
2649 stream->print("= ");
2650 if (at_this) {
2651 m->method_holder()->print_value_on(stream);
2652 } else {
2653 bool did_name = false;
2654 if (!at_this && ss.is_object()) {
2655 Symbol* name = ss.as_symbol_or_null();
2656 if (name != NULL) {
2657 name->print_value_on(stream);
2658 did_name = true;
2659 }
2660 }
2661 if (!did_name)
2662 stream->print("%s", type2name(t));
2663 }
2664 if (at_old_sp) {
2665 stream->print(" (%s of caller)", spname);
2666 did_old_sp = true;
2667 }
2668 stream->cr();
2669 sig_index += type2size[t];
2670 arg_index += 1;
2671 if (!at_this) ss.next();
2672 }
2673 if (!did_old_sp) {
2674 stream->print(" # ");
2675 stream->move_to(tab1);
2676 stream->print("[%s+0x%x]", spname, stack_slot_offset);
2677 stream->print(" (%s of caller)", spname);
2678 stream->cr();
2679 }
2680 }
2681 }
2682 }
2683
2684 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) {
2685 // First, find an oopmap in (begin, end].
2686 // We use the odd half-closed interval so that oop maps and scope descs
2687 // which are tied to the byte after a call are printed with the call itself.
2688 address base = code_begin();
2689 ImmutableOopMapSet* oms = oop_maps();
2690 if (oms != NULL) {
2691 for (int i = 0, imax = oms->count(); i < imax; i++) {
2692 const ImmutableOopMapPair* pair = oms->pair_at(i);
2693 const ImmutableOopMap* om = pair->get_from(oms);
2694 address pc = base + pair->pc_offset();
2695 if (pc > begin) {
2696 if (pc <= end) {
2697 st->move_to(column);
2698 st->print("; ");
2699 om->print_on(st);
2700 }
2701 break;
2702 }
2703 }
2704 }
2705
2706 // Print any debug info present at this pc.
2707 ScopeDesc* sd = scope_desc_in(begin, end);
2708 if (sd != NULL) {
2709 st->move_to(column);
2710 if (sd->bci() == SynchronizationEntryBCI) {
2711 st->print(";*synchronization entry");
2712 } else if (sd->bci() == AfterBci) {
2713 st->print(";* method exit (unlocked if synchronized)");
2714 } else if (sd->bci() == UnwindBci) {
2715 st->print(";* unwind (locked if synchronized)");
2716 } else if (sd->bci() == AfterExceptionBci) {
2717 st->print(";* unwind (unlocked if synchronized)");
2718 } else if (sd->bci() == UnknownBci) {
2719 st->print(";* unknown");
2720 } else if (sd->bci() == InvalidFrameStateBci) {
2721 st->print(";* invalid frame state");
2722 } else {
2723 if (sd->method() == NULL) {
2724 st->print("method is NULL");
2725 } else if (sd->method()->is_native()) {
2726 st->print("method is native");
2727 } else {
2728 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci());
2729 st->print(";*%s", Bytecodes::name(bc));
2730 switch (bc) {
2731 case Bytecodes::_invokevirtual:
2732 case Bytecodes::_invokespecial:
2733 case Bytecodes::_invokestatic:
2734 case Bytecodes::_invokeinterface:
2735 {
2736 Bytecode_invoke invoke(sd->method(), sd->bci());
2737 st->print(" ");
2738 if (invoke.name() != NULL)
2739 invoke.name()->print_symbol_on(st);
2740 else
2741 st->print("<UNKNOWN>");
2742 break;
2743 }
2744 case Bytecodes::_getfield:
2745 case Bytecodes::_putfield:
2746 case Bytecodes::_getstatic:
2747 case Bytecodes::_putstatic:
2748 {
2749 Bytecode_field field(sd->method(), sd->bci());
2750 st->print(" ");
2751 if (field.name() != NULL)
2752 field.name()->print_symbol_on(st);
2753 else
2754 st->print("<UNKNOWN>");
2755 }
2756 default:
2757 break;
2758 }
2759 }
2760 st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop());
2761 }
2762
2763 // Print all scopes
2764 for (;sd != NULL; sd = sd->sender()) {
2765 st->move_to(column);
2766 st->print("; -");
2767 if (sd->method() == NULL) {
2768 st->print("method is NULL");
2769 } else {
2770 sd->method()->print_short_name(st);
2771 }
2772 int lineno = sd->method()->line_number_from_bci(sd->bci());
2773 if (lineno != -1) {
2774 st->print("@%d (line %d)", sd->bci(), lineno);
2775 } else {
2776 st->print("@%d", sd->bci());
2777 }
2778 st->cr();
2779 }
2780 }
2781
2782 // Print relocation information
2783 const char* str = reloc_string_for(begin, end);
2784 if (str != NULL) {
2785 if (sd != NULL) st->cr();
2786 st->move_to(column);
2787 st->print("; {%s}", str);
2788 }
2789 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin());
2790 if (cont_offset != 0) {
2791 st->move_to(column);
2792 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset));
2793 }
2794
2795 }
2796
2797 class DirectNativeCallWrapper: public NativeCallWrapper {
2798 private:
2799 NativeCall* _call;
2800
2801 public:
2802 DirectNativeCallWrapper(NativeCall* call) : _call(call) {}
2803
2804 virtual address destination() const { return _call->destination(); }
2805 virtual address instruction_address() const { return _call->instruction_address(); }
2806 virtual address next_instruction_address() const { return _call->next_instruction_address(); }
2807 virtual address return_address() const { return _call->return_address(); }
2808
2809 virtual address get_resolve_call_stub(bool is_optimized) const {
2810 if (is_optimized) {
2811 return SharedRuntime::get_resolve_opt_virtual_call_stub();
2812 }
2813 return SharedRuntime::get_resolve_virtual_call_stub();
2814 }
2815
2816 virtual void set_destination_mt_safe(address dest) {
2817 #if INCLUDE_AOT
2818 if (UseAOT) {
2819 CodeBlob* callee = CodeCache::find_blob(dest);
2820 CompiledMethod* cm = callee->as_compiled_method_or_null();
2821 if (cm != NULL && cm->is_far_code()) {
2822 // Temporary fix, see JDK-8143106
2823 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address());
2824 csc->set_to_far(methodHandle(cm->method()), dest);
2825 return;
2826 }
2827 }
2828 #endif
2829 _call->set_destination_mt_safe(dest);
2830 }
2831
2832 virtual void set_to_interpreted(const methodHandle& method, CompiledICInfo& info) {
2833 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address());
2834 #if INCLUDE_AOT
2835 if (info.to_aot()) {
2836 csc->set_to_far(method, info.entry());
2837 } else
2838 #endif
2839 {
2840 csc->set_to_interpreted(method, info.entry());
2841 }
2842 }
2843
2844 virtual void verify() const {
2845 // make sure code pattern is actually a call imm32 instruction
2846 _call->verify();
2847 _call->verify_alignment();
2848 }
2849
2850 virtual void verify_resolve_call(address dest) const {
2851 CodeBlob* db = CodeCache::find_blob_unsafe(dest);
2852 assert(db != NULL && !db->is_adapter_blob(), "must use stub!");
2853 }
2854
2855 virtual bool is_call_to_interpreted(address dest) const {
2856 CodeBlob* cb = CodeCache::find_blob(_call->instruction_address());
2857 return cb->contains(dest);
2858 }
2859
2860 virtual bool is_safe_for_patching() const { return false; }
2861
2862 virtual NativeInstruction* get_load_instruction(virtual_call_Relocation* r) const {
2863 return nativeMovConstReg_at(r->cached_value());
2864 }
2865
2866 virtual void *get_data(NativeInstruction* instruction) const {
2867 return (void*)((NativeMovConstReg*) instruction)->data();
2868 }
2869
2870 virtual void set_data(NativeInstruction* instruction, intptr_t data) {
2871 ((NativeMovConstReg*) instruction)->set_data(data);
2872 }
2873 };
2874
2875 NativeCallWrapper* nmethod::call_wrapper_at(address call) const {
2876 return new DirectNativeCallWrapper((NativeCall*) call);
2877 }
2878
2879 NativeCallWrapper* nmethod::call_wrapper_before(address return_pc) const {
2880 return new DirectNativeCallWrapper(nativeCall_before(return_pc));
2881 }
2882
2883 address nmethod::call_instruction_address(address pc) const {
2884 if (NativeCall::is_call_before(pc)) {
2885 NativeCall *ncall = nativeCall_before(pc);
2886 return ncall->instruction_address();
2887 }
2888 return NULL;
2889 }
2890
2891 CompiledStaticCall* nmethod::compiledStaticCall_at(Relocation* call_site) const {
2892 return CompiledDirectStaticCall::at(call_site);
2893 }
2894
2895 CompiledStaticCall* nmethod::compiledStaticCall_at(address call_site) const {
2896 return CompiledDirectStaticCall::at(call_site);
2897 }
2898
2899 CompiledStaticCall* nmethod::compiledStaticCall_before(address return_addr) const {
2900 return CompiledDirectStaticCall::before(return_addr);
2901 }
2902
2903 #ifndef PRODUCT
2904
2905 void nmethod::print_value_on(outputStream* st) const {
2906 st->print("nmethod");
2907 print_on(st, NULL);
2908 }
2909
2910 void nmethod::print_calls(outputStream* st) {
2911 RelocIterator iter(this);
2912 while (iter.next()) {
2913 switch (iter.type()) {
2914 case relocInfo::virtual_call_type:
2915 case relocInfo::opt_virtual_call_type: {
2916 CompiledICLocker ml_verify(this);
2917 CompiledIC_at(&iter)->print();
2918 break;
2919 }
2920 case relocInfo::static_call_type:
2921 st->print_cr("Static call at " INTPTR_FORMAT, p2i(iter.reloc()->addr()));
2922 CompiledDirectStaticCall::at(iter.reloc())->print();
2923 break;
2924 default:
2925 break;
2926 }
2927 }
2928 }
2929
2930 void nmethod::print_handler_table() {
2931 ExceptionHandlerTable(this).print();
2932 }
2933
2934 void nmethod::print_nul_chk_table() {
2935 ImplicitExceptionTable(this).print(code_begin());
2936 }
2937
2938 void nmethod::print_statistics() {
2939 ttyLocker ttyl;
2940 if (xtty != NULL) xtty->head("statistics type='nmethod'");
2941 native_nmethod_stats.print_native_nmethod_stats();
2942 #ifdef COMPILER1
2943 c1_java_nmethod_stats.print_nmethod_stats("C1");
2944 #endif
2945 #ifdef COMPILER2
2946 c2_java_nmethod_stats.print_nmethod_stats("C2");
2947 #endif
2948 #if INCLUDE_JVMCI
2949 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI");
2950 #endif
2951 unknown_java_nmethod_stats.print_nmethod_stats("Unknown");
2952 DebugInformationRecorder::print_statistics();
2953 #ifndef PRODUCT
2954 pc_nmethod_stats.print_pc_stats();
2955 #endif
2956 Dependencies::print_statistics();
2957 if (xtty != NULL) xtty->tail("statistics");
2958 }
2959
2960 #endif // !PRODUCT
2961
2962 #if INCLUDE_JVMCI
2963 void nmethod::clear_jvmci_installed_code() {
2964 assert_locked_or_safepoint(Patching_lock);
2965 if (_jvmci_installed_code != NULL) {
2966 JNIHandles::destroy_weak_global(_jvmci_installed_code);
2967 _jvmci_installed_code = NULL;
2968 }
2969 }
2970
2971 void nmethod::clear_speculation_log() {
2972 assert_locked_or_safepoint(Patching_lock);
2973 if (_speculation_log != NULL) {
2974 JNIHandles::destroy_weak_global(_speculation_log);
2975 _speculation_log = NULL;
2976 }
2977 }
2978
2979 void nmethod::maybe_invalidate_installed_code() {
2980 if (!is_compiled_by_jvmci()) {
2981 return;
2982 }
2983
2984 assert(Patching_lock->is_locked() ||
2985 SafepointSynchronize::is_at_safepoint(), "should be performed under a lock for consistency");
2986 oop installed_code = JNIHandles::resolve(_jvmci_installed_code);
2987 if (installed_code != NULL) {
2988 // Update the values in the InstalledCode instance if it still refers to this nmethod
2989 nmethod* nm = (nmethod*)InstalledCode::address(installed_code);
2990 if (nm == this) {
2991 if (!is_alive() || is_unloading()) {
2992 // Break the link between nmethod and InstalledCode such that the nmethod
2993 // can subsequently be flushed safely. The link must be maintained while
2994 // the method could have live activations since invalidateInstalledCode
2995 // might want to invalidate all existing activations.
2996 InstalledCode::set_address(installed_code, 0);
2997 InstalledCode::set_entryPoint(installed_code, 0);
2998 } else if (is_not_entrant()) {
2999 // Remove the entry point so any invocation will fail but keep
3000 // the address link around that so that existing activations can
3001 // be invalidated.
3002 InstalledCode::set_entryPoint(installed_code, 0);
3003 }
3004 }
3005 }
3006 if (!is_alive() || is_unloading()) {
3007 // Clear these out after the nmethod has been unregistered and any
3008 // updates to the InstalledCode instance have been performed.
3009 clear_jvmci_installed_code();
3010 clear_speculation_log();
3011 }
3012 }
3013
3014 void nmethod::invalidate_installed_code(Handle installedCode, TRAPS) {
3015 if (installedCode() == NULL) {
3016 THROW(vmSymbols::java_lang_NullPointerException());
3017 }
3018 jlong nativeMethod = InstalledCode::address(installedCode);
3019 nmethod* nm = (nmethod*)nativeMethod;
3020 if (nm == NULL) {
3021 // Nothing to do
3022 return;
3023 }
3024
3025 nmethodLocker nml(nm);
3026 #ifdef ASSERT
3027 {
3028 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
3029 // This relationship can only be checked safely under a lock
3030 assert(!nm->is_alive() || nm->is_unloading() || nm->jvmci_installed_code() == installedCode(), "sanity check");
3031 }
3032 #endif
3033
3034 if (nm->is_alive()) {
3035 // Invalidating the InstalledCode means we want the nmethod
3036 // to be deoptimized.
3037 nm->mark_for_deoptimization();
3038 VM_Deoptimize op;
3039 VMThread::execute(&op);
3040 }
3041
3042 // Multiple threads could reach this point so we now need to
3043 // lock and re-check the link to the nmethod so that only one
3044 // thread clears it.
3045 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
3046 if (InstalledCode::address(installedCode) == nativeMethod) {
3047 InstalledCode::set_address(installedCode, 0);
3048 }
3049 }
3050
3051 oop nmethod::jvmci_installed_code() {
3052 return JNIHandles::resolve(_jvmci_installed_code);
3053 }
3054
3055 oop nmethod::speculation_log() {
3056 return JNIHandles::resolve(_speculation_log);
3057 }
3058
3059 char* nmethod::jvmci_installed_code_name(char* buf, size_t buflen) const {
3060 if (!this->is_compiled_by_jvmci()) {
3061 return NULL;
3062 }
3063 oop installed_code = JNIHandles::resolve(_jvmci_installed_code);
3064 if (installed_code != NULL) {
3065 oop installed_code_name = NULL;
3066 if (installed_code->is_a(InstalledCode::klass())) {
3067 installed_code_name = InstalledCode::name(installed_code);
3068 }
3069 if (installed_code_name != NULL) {
3070 return java_lang_String::as_utf8_string(installed_code_name, buf, (int)buflen);
3071 }
3072 }
3073 return NULL;
3074 }
3075 #endif