1 /*
2 * Copyright (c) 1997, 2021, 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 "asm/assembler.inline.hpp"
28 #include "code/codeCache.hpp"
29 #include "code/compiledIC.hpp"
30 #include "code/compiledMethod.inline.hpp"
31 #include "code/dependencies.hpp"
32 #include "code/nativeInst.hpp"
33 #include "code/nmethod.hpp"
34 #include "code/scopeDesc.hpp"
35 #include "compiler/abstractCompiler.hpp"
36 #include "compiler/compileBroker.hpp"
37 #include "compiler/compileLog.hpp"
38 #include "compiler/compilerDirectives.hpp"
39 #include "compiler/directivesParser.hpp"
40 #include "compiler/disassembler.hpp"
41 #include "compiler/oopMap.hpp"
42 #include "gc/shared/collectedHeap.hpp"
43 #include "interpreter/bytecode.hpp"
44 #include "logging/log.hpp"
45 #include "logging/logStream.hpp"
46 #include "memory/allocation.inline.hpp"
47 #include "memory/resourceArea.hpp"
48 #include "memory/universe.hpp"
49 #include "oops/access.inline.hpp"
50 #include "oops/klass.inline.hpp"
51 #include "oops/method.inline.hpp"
52 #include "oops/methodData.hpp"
53 #include "oops/oop.inline.hpp"
54 #include "prims/jvmtiImpl.hpp"
55 #include "prims/jvmtiThreadState.hpp"
56 #include "prims/methodHandles.hpp"
57 #include "runtime/atomic.hpp"
58 #include "runtime/deoptimization.hpp"
59 #include "runtime/flags/flagSetting.hpp"
60 #include "runtime/frame.inline.hpp"
61 #include "runtime/handles.inline.hpp"
62 #include "runtime/jniHandles.inline.hpp"
63 #include "runtime/orderAccess.hpp"
64 #include "runtime/os.hpp"
65 #include "runtime/safepointVerifiers.hpp"
66 #include "runtime/serviceThread.hpp"
67 #include "runtime/sharedRuntime.hpp"
68 #include "runtime/signature.hpp"
69 #include "runtime/sweeper.hpp"
70 #include "runtime/threadWXSetters.inline.hpp"
71 #include "runtime/vmThread.hpp"
72 #include "utilities/align.hpp"
73 #include "utilities/copy.hpp"
74 #include "utilities/dtrace.hpp"
75 #include "utilities/events.hpp"
76 #include "utilities/globalDefinitions.hpp"
77 #include "utilities/resourceHash.hpp"
78 #include "utilities/xmlstream.hpp"
79 #if INCLUDE_JVMCI
80 #include "jvmci/jvmciRuntime.hpp"
81 #endif
82
83 #ifdef DTRACE_ENABLED
84
85 // Only bother with this argument setup if dtrace is available
86
87 #define DTRACE_METHOD_UNLOAD_PROBE(method) \
88 { \
89 Method* m = (method); \
90 if (m != NULL) { \
91 Symbol* klass_name = m->klass_name(); \
92 Symbol* name = m->name(); \
93 Symbol* signature = m->signature(); \
94 HOTSPOT_COMPILED_METHOD_UNLOAD( \
95 (char *) klass_name->bytes(), klass_name->utf8_length(), \
96 (char *) name->bytes(), name->utf8_length(), \
97 (char *) signature->bytes(), signature->utf8_length()); \
98 } \
99 }
100
101 #else // ndef DTRACE_ENABLED
102
103 #define DTRACE_METHOD_UNLOAD_PROBE(method)
104
105 #endif
106
107 //---------------------------------------------------------------------------------
108 // NMethod statistics
109 // They are printed under various flags, including:
110 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation.
111 // (In the latter two cases, they like other stats are printed to the log only.)
112
113 #ifndef PRODUCT
114 // These variables are put into one block to reduce relocations
115 // and make it simpler to print from the debugger.
116 struct java_nmethod_stats_struct {
117 int nmethod_count;
118 int total_size;
119 int relocation_size;
120 int consts_size;
121 int insts_size;
122 int stub_size;
123 int scopes_data_size;
124 int scopes_pcs_size;
125 int dependencies_size;
126 int handler_table_size;
127 int nul_chk_table_size;
128 #if INCLUDE_JVMCI
129 int speculations_size;
130 int jvmci_data_size;
131 #endif
132 int oops_size;
133 int metadata_size;
134
135 void note_nmethod(nmethod* nm) {
136 nmethod_count += 1;
137 total_size += nm->size();
138 relocation_size += nm->relocation_size();
139 consts_size += nm->consts_size();
140 insts_size += nm->insts_size();
141 stub_size += nm->stub_size();
142 oops_size += nm->oops_size();
143 metadata_size += nm->metadata_size();
144 scopes_data_size += nm->scopes_data_size();
145 scopes_pcs_size += nm->scopes_pcs_size();
146 dependencies_size += nm->dependencies_size();
147 handler_table_size += nm->handler_table_size();
148 nul_chk_table_size += nm->nul_chk_table_size();
149 #if INCLUDE_JVMCI
150 speculations_size += nm->speculations_size();
151 jvmci_data_size += nm->jvmci_data_size();
152 #endif
153 }
154 void print_nmethod_stats(const char* name) {
155 if (nmethod_count == 0) return;
156 tty->print_cr("Statistics for %d bytecoded nmethods for %s:", nmethod_count, name);
157 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size);
158 if (nmethod_count != 0) tty->print_cr(" header = " SIZE_FORMAT, nmethod_count * sizeof(nmethod));
159 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size);
160 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size);
161 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size);
162 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size);
163 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size);
164 if (metadata_size != 0) tty->print_cr(" metadata = %d", metadata_size);
165 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size);
166 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size);
167 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size);
168 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size);
169 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size);
170 #if INCLUDE_JVMCI
171 if (speculations_size != 0) tty->print_cr(" speculations = %d", speculations_size);
172 if (jvmci_data_size != 0) tty->print_cr(" JVMCI data = %d", jvmci_data_size);
173 #endif
174 }
175 };
176
177 struct native_nmethod_stats_struct {
178 int native_nmethod_count;
179 int native_total_size;
180 int native_relocation_size;
181 int native_insts_size;
182 int native_oops_size;
183 int native_metadata_size;
184 void note_native_nmethod(nmethod* nm) {
185 native_nmethod_count += 1;
186 native_total_size += nm->size();
187 native_relocation_size += nm->relocation_size();
188 native_insts_size += nm->insts_size();
189 native_oops_size += nm->oops_size();
190 native_metadata_size += nm->metadata_size();
191 }
192 void print_native_nmethod_stats() {
193 if (native_nmethod_count == 0) return;
194 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count);
195 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size);
196 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size);
197 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size);
198 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size);
199 if (native_metadata_size != 0) tty->print_cr(" N. metadata = %d", native_metadata_size);
200 }
201 };
202
203 struct pc_nmethod_stats_struct {
204 int pc_desc_resets; // number of resets (= number of caches)
205 int pc_desc_queries; // queries to nmethod::find_pc_desc
206 int pc_desc_approx; // number of those which have approximate true
207 int pc_desc_repeats; // number of _pc_descs[0] hits
208 int pc_desc_hits; // number of LRU cache hits
209 int pc_desc_tests; // total number of PcDesc examinations
210 int pc_desc_searches; // total number of quasi-binary search steps
211 int pc_desc_adds; // number of LUR cache insertions
212
213 void print_pc_stats() {
214 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query",
215 pc_desc_queries,
216 (double)(pc_desc_tests + pc_desc_searches)
217 / pc_desc_queries);
218 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d",
219 pc_desc_resets,
220 pc_desc_queries, pc_desc_approx,
221 pc_desc_repeats, pc_desc_hits,
222 pc_desc_tests, pc_desc_searches, pc_desc_adds);
223 }
224 };
225
226 #ifdef COMPILER1
227 static java_nmethod_stats_struct c1_java_nmethod_stats;
228 #endif
229 #ifdef COMPILER2
230 static java_nmethod_stats_struct c2_java_nmethod_stats;
231 #endif
232 #if INCLUDE_JVMCI
233 static java_nmethod_stats_struct jvmci_java_nmethod_stats;
234 #endif
235 static java_nmethod_stats_struct unknown_java_nmethod_stats;
236
237 static native_nmethod_stats_struct native_nmethod_stats;
238 static pc_nmethod_stats_struct pc_nmethod_stats;
239
240 static void note_java_nmethod(nmethod* nm) {
241 #ifdef COMPILER1
242 if (nm->is_compiled_by_c1()) {
243 c1_java_nmethod_stats.note_nmethod(nm);
244 } else
245 #endif
246 #ifdef COMPILER2
247 if (nm->is_compiled_by_c2()) {
248 c2_java_nmethod_stats.note_nmethod(nm);
249 } else
250 #endif
251 #if INCLUDE_JVMCI
252 if (nm->is_compiled_by_jvmci()) {
253 jvmci_java_nmethod_stats.note_nmethod(nm);
254 } else
255 #endif
256 {
257 unknown_java_nmethod_stats.note_nmethod(nm);
258 }
259 }
260 #endif // !PRODUCT
261
262 //---------------------------------------------------------------------------------
263
264
265 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) {
266 assert(pc != NULL, "Must be non null");
267 assert(exception.not_null(), "Must be non null");
268 assert(handler != NULL, "Must be non null");
269
270 _count = 0;
271 _exception_type = exception->klass();
272 _next = NULL;
273 _purge_list_next = NULL;
274
275 add_address_and_handler(pc,handler);
276 }
277
278
279 address ExceptionCache::match(Handle exception, address pc) {
280 assert(pc != NULL,"Must be non null");
281 assert(exception.not_null(),"Must be non null");
282 if (exception->klass() == exception_type()) {
283 return (test_address(pc));
284 }
285
286 return NULL;
287 }
288
289
290 bool ExceptionCache::match_exception_with_space(Handle exception) {
291 assert(exception.not_null(),"Must be non null");
292 if (exception->klass() == exception_type() && count() < cache_size) {
293 return true;
294 }
295 return false;
296 }
297
298
299 address ExceptionCache::test_address(address addr) {
300 int limit = count();
301 for (int i = 0; i < limit; i++) {
302 if (pc_at(i) == addr) {
303 return handler_at(i);
304 }
305 }
306 return NULL;
307 }
308
309
310 bool ExceptionCache::add_address_and_handler(address addr, address handler) {
311 if (test_address(addr) == handler) return true;
312
313 int index = count();
314 if (index < cache_size) {
315 set_pc_at(index, addr);
316 set_handler_at(index, handler);
317 increment_count();
318 return true;
319 }
320 return false;
321 }
322
323 ExceptionCache* ExceptionCache::next() {
324 return Atomic::load(&_next);
325 }
326
327 void ExceptionCache::set_next(ExceptionCache *ec) {
328 Atomic::store(&_next, ec);
329 }
330
331 //-----------------------------------------------------------------------------
332
333
334 // Helper used by both find_pc_desc methods.
335 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) {
336 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_tests);
337 if (!approximate)
338 return pc->pc_offset() == pc_offset;
339 else
340 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset();
341 }
342
343 void PcDescCache::reset_to(PcDesc* initial_pc_desc) {
344 if (initial_pc_desc == NULL) {
345 _pc_descs[0] = NULL; // native method; no PcDescs at all
346 return;
347 }
348 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_resets);
349 // reset the cache by filling it with benign (non-null) values
350 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel");
351 for (int i = 0; i < cache_size; i++)
352 _pc_descs[i] = initial_pc_desc;
353 }
354
355 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) {
356 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_queries);
357 NOT_PRODUCT(if (approximate) ++pc_nmethod_stats.pc_desc_approx);
358
359 // Note: one might think that caching the most recently
360 // read value separately would be a win, but one would be
361 // wrong. When many threads are updating it, the cache
362 // line it's in would bounce between caches, negating
363 // any benefit.
364
365 // In order to prevent race conditions do not load cache elements
366 // repeatedly, but use a local copy:
367 PcDesc* res;
368
369 // Step one: Check the most recently added value.
370 res = _pc_descs[0];
371 if (res == NULL) return NULL; // native method; no PcDescs at all
372 if (match_desc(res, pc_offset, approximate)) {
373 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_repeats);
374 return res;
375 }
376
377 // Step two: Check the rest of the LRU cache.
378 for (int i = 1; i < cache_size; ++i) {
379 res = _pc_descs[i];
380 if (res->pc_offset() < 0) break; // optimization: skip empty cache
381 if (match_desc(res, pc_offset, approximate)) {
382 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_hits);
383 return res;
384 }
385 }
386
387 // Report failure.
388 return NULL;
389 }
390
391 void PcDescCache::add_pc_desc(PcDesc* pc_desc) {
392 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_adds);
393 // Update the LRU cache by shifting pc_desc forward.
394 for (int i = 0; i < cache_size; i++) {
395 PcDesc* next = _pc_descs[i];
396 _pc_descs[i] = pc_desc;
397 pc_desc = next;
398 }
399 }
400
401 // adjust pcs_size so that it is a multiple of both oopSize and
402 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple
403 // of oopSize, then 2*sizeof(PcDesc) is)
404 static int adjust_pcs_size(int pcs_size) {
405 int nsize = align_up(pcs_size, oopSize);
406 if ((nsize % sizeof(PcDesc)) != 0) {
407 nsize = pcs_size + sizeof(PcDesc);
408 }
409 assert((nsize % oopSize) == 0, "correct alignment");
410 return nsize;
411 }
412
413
414 int nmethod::total_size() const {
415 return
416 consts_size() +
417 insts_size() +
418 stub_size() +
419 scopes_data_size() +
420 scopes_pcs_size() +
421 handler_table_size() +
422 nul_chk_table_size();
423 }
424
425 address* nmethod::orig_pc_addr(const frame* fr) {
426 return (address*) ((address)fr->unextended_sp() + _orig_pc_offset);
427 }
428
429 const char* nmethod::compile_kind() const {
430 if (is_osr_method()) return "osr";
431 if (method() != NULL && is_native_method()) return "c2n";
432 return NULL;
433 }
434
435 // Fill in default values for various flag fields
436 void nmethod::init_defaults() {
437 _state = not_installed;
438 _has_flushed_dependencies = 0;
439 _lock_count = 0;
440 _stack_traversal_mark = 0;
441 _load_reported = false; // jvmti state
442 _unload_reported = false;
443
444 #ifdef ASSERT
445 _oops_are_stale = false;
446 #endif
447
448 _oops_do_mark_link = NULL;
449 _osr_link = NULL;
450 #if INCLUDE_RTM_OPT
451 _rtm_state = NoRTM;
452 #endif
453 }
454
455 nmethod* nmethod::new_native_nmethod(const methodHandle& method,
456 int compile_id,
457 CodeBuffer *code_buffer,
458 int vep_offset,
459 int frame_complete,
460 int frame_size,
461 ByteSize basic_lock_owner_sp_offset,
462 ByteSize basic_lock_sp_offset,
463 OopMapSet* oop_maps) {
464 code_buffer->finalize_oop_references(method);
465 // create nmethod
466 nmethod* nm = NULL;
467 {
468 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
469 int native_nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod));
470
471 CodeOffsets offsets;
472 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
473 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
474 nm = new (native_nmethod_size, CompLevel_none)
475 nmethod(method(), compiler_none, native_nmethod_size,
476 compile_id, &offsets,
477 code_buffer, frame_size,
478 basic_lock_owner_sp_offset,
479 basic_lock_sp_offset,
480 oop_maps);
481 NOT_PRODUCT(if (nm != NULL) native_nmethod_stats.note_native_nmethod(nm));
482 }
483
484 if (nm != NULL) {
485 // verify nmethod
486 debug_only(nm->verify();) // might block
487
488 nm->log_new_nmethod();
489 }
490 return nm;
491 }
492
493 nmethod* nmethod::new_nmethod(const methodHandle& method,
494 int compile_id,
495 int entry_bci,
496 CodeOffsets* offsets,
497 int orig_pc_offset,
498 DebugInformationRecorder* debug_info,
499 Dependencies* dependencies,
500 CodeBuffer* code_buffer, int frame_size,
501 OopMapSet* oop_maps,
502 ExceptionHandlerTable* handler_table,
503 ImplicitExceptionTable* nul_chk_table,
504 AbstractCompiler* compiler,
505 int comp_level,
506 const GrowableArrayView<RuntimeStub*>& native_invokers
507 #if INCLUDE_JVMCI
508 , char* speculations,
509 int speculations_len,
510 int nmethod_mirror_index,
511 const char* nmethod_mirror_name,
512 FailedSpeculation** failed_speculations
513 #endif
514 )
515 {
516 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
517 code_buffer->finalize_oop_references(method);
518 // create nmethod
519 nmethod* nm = NULL;
520 { MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
521 #if INCLUDE_JVMCI
522 int jvmci_data_size = !compiler->is_jvmci() ? 0 : JVMCINMethodData::compute_size(nmethod_mirror_name);
523 #endif
524 int nmethod_size =
525 CodeBlob::allocation_size(code_buffer, sizeof(nmethod))
526 + adjust_pcs_size(debug_info->pcs_size())
527 + align_up((int)dependencies->size_in_bytes(), oopSize)
528 + align_up(checked_cast<int>(native_invokers.data_size_in_bytes()), oopSize)
529 + align_up(handler_table->size_in_bytes() , oopSize)
530 + align_up(nul_chk_table->size_in_bytes() , oopSize)
531 #if INCLUDE_JVMCI
532 + align_up(speculations_len , oopSize)
533 + align_up(jvmci_data_size , oopSize)
534 #endif
535 + align_up(debug_info->data_size() , oopSize);
536
537 nm = new (nmethod_size, comp_level)
538 nmethod(method(), compiler->type(), nmethod_size, compile_id, entry_bci, offsets,
539 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size,
540 oop_maps,
541 handler_table,
542 nul_chk_table,
543 compiler,
544 comp_level,
545 native_invokers
546 #if INCLUDE_JVMCI
547 , speculations,
548 speculations_len,
549 jvmci_data_size
550 #endif
551 );
552
553 if (nm != NULL) {
554 #if INCLUDE_JVMCI
555 if (compiler->is_jvmci()) {
556 // Initialize the JVMCINMethodData object inlined into nm
557 nm->jvmci_nmethod_data()->initialize(nmethod_mirror_index, nmethod_mirror_name, failed_speculations);
558 }
559 #endif
560 // To make dependency checking during class loading fast, record
561 // the nmethod dependencies in the classes it is dependent on.
562 // This allows the dependency checking code to simply walk the
563 // class hierarchy above the loaded class, checking only nmethods
564 // which are dependent on those classes. The slow way is to
565 // check every nmethod for dependencies which makes it linear in
566 // the number of methods compiled. For applications with a lot
567 // classes the slow way is too slow.
568 for (Dependencies::DepStream deps(nm); deps.next(); ) {
569 if (deps.type() == Dependencies::call_site_target_value) {
570 // CallSite dependencies are managed on per-CallSite instance basis.
571 oop call_site = deps.argument_oop(0);
572 MethodHandles::add_dependent_nmethod(call_site, nm);
573 } else {
574 Klass* klass = deps.context_type();
575 if (klass == NULL) {
576 continue; // ignore things like evol_method
577 }
578 // record this nmethod as dependent on this klass
579 InstanceKlass::cast(klass)->add_dependent_nmethod(nm);
580 }
581 }
582 NOT_PRODUCT(if (nm != NULL) note_java_nmethod(nm));
583 }
584 }
585 // Do verification and logging outside CodeCache_lock.
586 if (nm != NULL) {
587 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
588 DEBUG_ONLY(nm->verify();)
589 nm->log_new_nmethod();
590 }
591 return nm;
592 }
593
594 // For native wrappers
595 nmethod::nmethod(
596 Method* method,
597 CompilerType type,
598 int nmethod_size,
599 int compile_id,
600 CodeOffsets* offsets,
601 CodeBuffer* code_buffer,
602 int frame_size,
603 ByteSize basic_lock_owner_sp_offset,
604 ByteSize basic_lock_sp_offset,
605 OopMapSet* oop_maps )
606 : CompiledMethod(method, "native nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false),
607 _is_unloading_state(0),
608 _native_receiver_sp_offset(basic_lock_owner_sp_offset),
609 _native_basic_lock_sp_offset(basic_lock_sp_offset)
610 {
611 {
612 int scopes_data_offset = 0;
613 int deoptimize_offset = 0;
614 int deoptimize_mh_offset = 0;
615
616 debug_only(NoSafepointVerifier nsv;)
617 assert_locked_or_safepoint(CodeCache_lock);
618
619 init_defaults();
620 _entry_bci = InvocationEntryBci;
621 // We have no exception handler or deopt handler make the
622 // values something that will never match a pc like the nmethod vtable entry
623 _exception_offset = 0;
624 _orig_pc_offset = 0;
625
626 _consts_offset = data_offset();
627 _stub_offset = data_offset();
628 _oops_offset = data_offset();
629 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize);
630 scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize);
631 _scopes_pcs_offset = scopes_data_offset;
632 _dependencies_offset = _scopes_pcs_offset;
633 _native_invokers_offset = _dependencies_offset;
634 _handler_table_offset = _native_invokers_offset;
635 _nul_chk_table_offset = _handler_table_offset;
636 #if INCLUDE_JVMCI
637 _speculations_offset = _nul_chk_table_offset;
638 _jvmci_data_offset = _speculations_offset;
639 _nmethod_end_offset = _jvmci_data_offset;
640 #else
641 _nmethod_end_offset = _nul_chk_table_offset;
642 #endif
643 _compile_id = compile_id;
644 _comp_level = CompLevel_none;
645 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
646 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
647
648 assert(!method->has_scalarized_args(), "scalarized native wrappers not supported yet"); // for the next 3 fields
649 _inline_entry_point = _entry_point;
650 _verified_inline_entry_point = _verified_entry_point;
651 _verified_inline_ro_entry_point = _verified_entry_point;
652
653 _osr_entry_point = NULL;
654 _exception_cache = NULL;
655 _pc_desc_container.reset_to(NULL);
656 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
657
658 _scopes_data_begin = (address) this + scopes_data_offset;
659 _deopt_handler_begin = (address) this + deoptimize_offset;
660 _deopt_mh_handler_begin = (address) this + deoptimize_mh_offset;
661
662 code_buffer->copy_code_and_locs_to(this);
663 code_buffer->copy_values_to(this);
664
665 clear_unloading_state();
666
667 Universe::heap()->register_nmethod(this);
668 debug_only(Universe::heap()->verify_nmethod(this));
669
670 CodeCache::commit(this);
671 }
672
673 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
674 ttyLocker ttyl; // keep the following output all in one block
675 // This output goes directly to the tty, not the compiler log.
676 // To enable tools to match it up with the compilation activity,
677 // be sure to tag this tty output with the compile ID.
678 if (xtty != NULL) {
679 xtty->begin_head("print_native_nmethod");
680 xtty->method(_method);
681 xtty->stamp();
682 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
683 }
684 // Print the header part, then print the requested information.
685 // This is both handled in decode2(), called via print_code() -> decode()
686 if (PrintNativeNMethods) {
687 tty->print_cr("-------------------------- Assembly (native nmethod) ---------------------------");
688 print_code();
689 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
690 #if defined(SUPPORT_DATA_STRUCTS)
691 if (AbstractDisassembler::show_structs()) {
692 if (oop_maps != NULL) {
693 tty->print("oop maps:"); // oop_maps->print_on(tty) outputs a cr() at the beginning
694 oop_maps->print_on(tty);
695 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
696 }
697 }
698 #endif
699 } else {
700 print(); // print the header part only.
701 }
702 #if defined(SUPPORT_DATA_STRUCTS)
703 if (AbstractDisassembler::show_structs()) {
704 if (PrintRelocations) {
705 print_relocations();
706 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
707 }
708 }
709 #endif
710 if (xtty != NULL) {
711 xtty->tail("print_native_nmethod");
712 }
713 }
714 }
715
716 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () {
717 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level));
718 }
719
720 nmethod::nmethod(
721 Method* method,
722 CompilerType type,
723 int nmethod_size,
724 int compile_id,
725 int entry_bci,
726 CodeOffsets* offsets,
727 int orig_pc_offset,
728 DebugInformationRecorder* debug_info,
729 Dependencies* dependencies,
730 CodeBuffer *code_buffer,
731 int frame_size,
732 OopMapSet* oop_maps,
733 ExceptionHandlerTable* handler_table,
734 ImplicitExceptionTable* nul_chk_table,
735 AbstractCompiler* compiler,
736 int comp_level,
737 const GrowableArrayView<RuntimeStub*>& native_invokers
738 #if INCLUDE_JVMCI
739 , char* speculations,
740 int speculations_len,
741 int jvmci_data_size
742 #endif
743 )
744 : CompiledMethod(method, "nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false),
745 _is_unloading_state(0),
746 _native_receiver_sp_offset(in_ByteSize(-1)),
747 _native_basic_lock_sp_offset(in_ByteSize(-1))
748 {
749 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
750 {
751 debug_only(NoSafepointVerifier nsv;)
752 assert_locked_or_safepoint(CodeCache_lock);
753
754 _deopt_handler_begin = (address) this;
755 _deopt_mh_handler_begin = (address) this;
756
757 init_defaults();
758 _entry_bci = entry_bci;
759 _compile_id = compile_id;
760 _comp_level = comp_level;
761 _orig_pc_offset = orig_pc_offset;
762 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
763
764 // Section offsets
765 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts());
766 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs());
767 set_ctable_begin(header_begin() + _consts_offset);
768
769 #if INCLUDE_JVMCI
770 if (compiler->is_jvmci()) {
771 // JVMCI might not produce any stub sections
772 if (offsets->value(CodeOffsets::Exceptions) != -1) {
773 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions);
774 } else {
775 _exception_offset = -1;
776 }
777 if (offsets->value(CodeOffsets::Deopt) != -1) {
778 _deopt_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::Deopt);
779 } else {
780 _deopt_handler_begin = NULL;
781 }
782 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
783 _deopt_mh_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::DeoptMH);
784 } else {
785 _deopt_mh_handler_begin = NULL;
786 }
787 } else
788 #endif
789 {
790 // Exception handler and deopt handler are in the stub section
791 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set");
792 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set");
793
794 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
795 _deopt_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::Deopt);
796 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
797 _deopt_mh_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::DeoptMH);
798 } else {
799 _deopt_mh_handler_begin = NULL;
800 }
801 }
802 if (offsets->value(CodeOffsets::UnwindHandler) != -1) {
803 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler);
804 } else {
805 _unwind_handler_offset = -1;
806 }
807
808 _oops_offset = data_offset();
809 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize);
810 int scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize);
811
812 _scopes_pcs_offset = scopes_data_offset + align_up(debug_info->data_size (), oopSize);
813 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
814 _native_invokers_offset = _dependencies_offset + align_up((int)dependencies->size_in_bytes(), oopSize);
815 _handler_table_offset = _native_invokers_offset + align_up(checked_cast<int>(native_invokers.data_size_in_bytes()), oopSize);
816 _nul_chk_table_offset = _handler_table_offset + align_up(handler_table->size_in_bytes(), oopSize);
817 #if INCLUDE_JVMCI
818 _speculations_offset = _nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize);
819 _jvmci_data_offset = _speculations_offset + align_up(speculations_len, oopSize);
820 _nmethod_end_offset = _jvmci_data_offset + align_up(jvmci_data_size, oopSize);
821 #else
822 _nmethod_end_offset = _nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize);
823 #endif
824 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
825 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
826 _inline_entry_point = code_begin() + offsets->value(CodeOffsets::Inline_Entry);
827 _verified_inline_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Inline_Entry);
828 _verified_inline_ro_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Inline_Entry_RO);
829 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry);
830 _exception_cache = NULL;
831 _scopes_data_begin = (address) this + scopes_data_offset;
832
833 _pc_desc_container.reset_to(scopes_pcs_begin());
834
835 code_buffer->copy_code_and_locs_to(this);
836 // Copy contents of ScopeDescRecorder to nmethod
837 code_buffer->copy_values_to(this);
838 debug_info->copy_to(this);
839 dependencies->copy_to(this);
840 if (native_invokers.is_nonempty()) { // can not get address of zero-length array
841 // Copy native stubs
842 memcpy(native_invokers_begin(), native_invokers.adr_at(0), native_invokers.data_size_in_bytes());
843 }
844 clear_unloading_state();
845
846 Universe::heap()->register_nmethod(this);
847 debug_only(Universe::heap()->verify_nmethod(this));
848
849 CodeCache::commit(this);
850
851 // Copy contents of ExceptionHandlerTable to nmethod
852 handler_table->copy_to(this);
853 nul_chk_table->copy_to(this);
854
855 #if INCLUDE_JVMCI
856 // Copy speculations to nmethod
857 if (speculations_size() != 0) {
858 memcpy(speculations_begin(), speculations, speculations_len);
859 }
860 #endif
861
862 // we use the information of entry points to find out if a method is
863 // static or non static
864 assert(compiler->is_c2() || compiler->is_jvmci() ||
865 _method->is_static() == (entry_point() == _verified_entry_point),
866 " entry points must be same for static methods and vice versa");
867 }
868 }
869
870 // Print a short set of xml attributes to identify this nmethod. The
871 // output should be embedded in some other element.
872 void nmethod::log_identity(xmlStream* log) const {
873 log->print(" compile_id='%d'", compile_id());
874 const char* nm_kind = compile_kind();
875 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind);
876 log->print(" compiler='%s'", compiler_name());
877 if (TieredCompilation) {
878 log->print(" level='%d'", comp_level());
879 }
880 #if INCLUDE_JVMCI
881 if (jvmci_nmethod_data() != NULL) {
882 const char* jvmci_name = jvmci_nmethod_data()->name();
883 if (jvmci_name != NULL) {
884 log->print(" jvmci_mirror_name='");
885 log->text("%s", jvmci_name);
886 log->print("'");
887 }
888 }
889 #endif
890 }
891
892
893 #define LOG_OFFSET(log, name) \
894 if (p2i(name##_end()) - p2i(name##_begin())) \
895 log->print(" " XSTR(name) "_offset='" INTX_FORMAT "'" , \
896 p2i(name##_begin()) - p2i(this))
897
898
899 void nmethod::log_new_nmethod() const {
900 if (LogCompilation && xtty != NULL) {
901 ttyLocker ttyl;
902 xtty->begin_elem("nmethod");
903 log_identity(xtty);
904 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size());
905 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this));
906
907 LOG_OFFSET(xtty, relocation);
908 LOG_OFFSET(xtty, consts);
909 LOG_OFFSET(xtty, insts);
910 LOG_OFFSET(xtty, stub);
911 LOG_OFFSET(xtty, scopes_data);
912 LOG_OFFSET(xtty, scopes_pcs);
913 LOG_OFFSET(xtty, dependencies);
914 LOG_OFFSET(xtty, handler_table);
915 LOG_OFFSET(xtty, nul_chk_table);
916 LOG_OFFSET(xtty, oops);
917 LOG_OFFSET(xtty, metadata);
918
919 xtty->method(method());
920 xtty->stamp();
921 xtty->end_elem();
922 }
923 }
924
925 #undef LOG_OFFSET
926
927
928 // Print out more verbose output usually for a newly created nmethod.
929 void nmethod::print_on(outputStream* st, const char* msg) const {
930 if (st != NULL) {
931 ttyLocker ttyl;
932 if (WizardMode) {
933 CompileTask::print(st, this, msg, /*short_form:*/ true);
934 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this));
935 } else {
936 CompileTask::print(st, this, msg, /*short_form:*/ false);
937 }
938 }
939 }
940
941 void nmethod::maybe_print_nmethod(DirectiveSet* directive) {
942 bool printnmethods = directive->PrintAssemblyOption || directive->PrintNMethodsOption;
943 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
944 print_nmethod(printnmethods);
945 }
946 }
947
948 void nmethod::print_nmethod(bool printmethod) {
949 run_nmethod_entry_barrier(); // ensure all embedded OOPs are valid before printing
950
951 ttyLocker ttyl; // keep the following output all in one block
952 if (xtty != NULL) {
953 xtty->begin_head("print_nmethod");
954 log_identity(xtty);
955 xtty->stamp();
956 xtty->end_head();
957 }
958 // Print the header part, then print the requested information.
959 // This is both handled in decode2().
960 if (printmethod) {
961 ResourceMark m;
962 if (is_compiled_by_c1()) {
963 tty->cr();
964 tty->print_cr("============================= C1-compiled nmethod ==============================");
965 }
966 if (is_compiled_by_jvmci()) {
967 tty->cr();
968 tty->print_cr("=========================== JVMCI-compiled nmethod =============================");
969 }
970 tty->print_cr("----------------------------------- Assembly -----------------------------------");
971 decode2(tty);
972 #if defined(SUPPORT_DATA_STRUCTS)
973 if (AbstractDisassembler::show_structs()) {
974 // Print the oops from the underlying CodeBlob as well.
975 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
976 print_oops(tty);
977 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
978 print_metadata(tty);
979 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
980 print_pcs();
981 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
982 if (oop_maps() != NULL) {
983 tty->print("oop maps:"); // oop_maps()->print_on(tty) outputs a cr() at the beginning
984 oop_maps()->print_on(tty);
985 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
986 }
987 }
988 #endif
989 } else {
990 print(); // print the header part only.
991 }
992
993 #if defined(SUPPORT_DATA_STRUCTS)
994 if (AbstractDisassembler::show_structs()) {
995 methodHandle mh(Thread::current(), _method);
996 if (printmethod || PrintDebugInfo || CompilerOracle::has_option(mh, CompileCommand::PrintDebugInfo)) {
997 print_scopes();
998 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
999 }
1000 if (printmethod || PrintRelocations || CompilerOracle::has_option(mh, CompileCommand::PrintRelocations)) {
1001 print_relocations();
1002 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1003 }
1004 if (printmethod || PrintDependencies || CompilerOracle::has_option(mh, CompileCommand::PrintDependencies)) {
1005 print_dependencies();
1006 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1007 }
1008 if (printmethod && native_invokers_begin() < native_invokers_end()) {
1009 print_native_invokers();
1010 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1011 }
1012 if (printmethod || PrintExceptionHandlers) {
1013 print_handler_table();
1014 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1015 print_nul_chk_table();
1016 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1017 }
1018
1019 if (printmethod) {
1020 print_recorded_oops();
1021 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1022 print_recorded_metadata();
1023 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1024 }
1025 }
1026 #endif
1027
1028 if (xtty != NULL) {
1029 xtty->tail("print_nmethod");
1030 }
1031 }
1032
1033
1034 // Promote one word from an assembly-time handle to a live embedded oop.
1035 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
1036 if (handle == NULL ||
1037 // As a special case, IC oops are initialized to 1 or -1.
1038 handle == (jobject) Universe::non_oop_word()) {
1039 *(void**)dest = handle;
1040 } else {
1041 *dest = JNIHandles::resolve_non_null(handle);
1042 }
1043 }
1044
1045
1046 // Have to have the same name because it's called by a template
1047 void nmethod::copy_values(GrowableArray<jobject>* array) {
1048 int length = array->length();
1049 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
1050 oop* dest = oops_begin();
1051 for (int index = 0 ; index < length; index++) {
1052 initialize_immediate_oop(&dest[index], array->at(index));
1053 }
1054
1055 // Now we can fix up all the oops in the code. We need to do this
1056 // in the code because the assembler uses jobjects as placeholders.
1057 // The code and relocations have already been initialized by the
1058 // CodeBlob constructor, so it is valid even at this early point to
1059 // iterate over relocations and patch the code.
1060 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true);
1061 }
1062
1063 void nmethod::copy_values(GrowableArray<Metadata*>* array) {
1064 int length = array->length();
1065 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough");
1066 Metadata** dest = metadata_begin();
1067 for (int index = 0 ; index < length; index++) {
1068 dest[index] = array->at(index);
1069 }
1070 }
1071
1072 void nmethod::free_native_invokers() {
1073 for (RuntimeStub** it = native_invokers_begin(); it < native_invokers_end(); it++) {
1074 CodeCache::free(*it);
1075 }
1076 }
1077
1078 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) {
1079 // re-patch all oop-bearing instructions, just in case some oops moved
1080 RelocIterator iter(this, begin, end);
1081 while (iter.next()) {
1082 if (iter.type() == relocInfo::oop_type) {
1083 oop_Relocation* reloc = iter.oop_reloc();
1084 if (initialize_immediates && reloc->oop_is_immediate()) {
1085 oop* dest = reloc->oop_addr();
1086 initialize_immediate_oop(dest, cast_from_oop<jobject>(*dest));
1087 }
1088 // Refresh the oop-related bits of this instruction.
1089 reloc->fix_oop_relocation();
1090 } else if (iter.type() == relocInfo::metadata_type) {
1091 metadata_Relocation* reloc = iter.metadata_reloc();
1092 reloc->fix_metadata_relocation();
1093 }
1094 }
1095 }
1096
1097
1098 void nmethod::verify_clean_inline_caches() {
1099 assert(CompiledICLocker::is_safe(this), "mt unsafe call");
1100
1101 ResourceMark rm;
1102 RelocIterator iter(this, oops_reloc_begin());
1103 while(iter.next()) {
1104 switch(iter.type()) {
1105 case relocInfo::virtual_call_type:
1106 case relocInfo::opt_virtual_call_type: {
1107 CompiledIC *ic = CompiledIC_at(&iter);
1108 // Ok, to lookup references to zombies here
1109 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
1110 assert(cb != NULL, "destination not in CodeBlob?");
1111 nmethod* nm = cb->as_nmethod_or_null();
1112 if( nm != NULL ) {
1113 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
1114 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1115 assert(ic->is_clean(), "IC should be clean");
1116 }
1117 }
1118 break;
1119 }
1120 case relocInfo::static_call_type: {
1121 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
1122 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
1123 assert(cb != NULL, "destination not in CodeBlob?");
1124 nmethod* nm = cb->as_nmethod_or_null();
1125 if( nm != NULL ) {
1126 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
1127 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1128 assert(csc->is_clean(), "IC should be clean");
1129 }
1130 }
1131 break;
1132 }
1133 default:
1134 break;
1135 }
1136 }
1137 }
1138
1139 // This is a private interface with the sweeper.
1140 void nmethod::mark_as_seen_on_stack() {
1141 assert(is_alive(), "Must be an alive method");
1142 // Set the traversal mark to ensure that the sweeper does 2
1143 // cleaning passes before moving to zombie.
1144 set_stack_traversal_mark(NMethodSweeper::traversal_count());
1145 }
1146
1147 // Tell if a non-entrant method can be converted to a zombie (i.e.,
1148 // there are no activations on the stack, not in use by the VM,
1149 // and not in use by the ServiceThread)
1150 bool nmethod::can_convert_to_zombie() {
1151 // Note that this is called when the sweeper has observed the nmethod to be
1152 // not_entrant. However, with concurrent code cache unloading, the state
1153 // might have moved on to unloaded if it is_unloading(), due to racing
1154 // concurrent GC threads.
1155 assert(is_not_entrant() || is_unloading() ||
1156 !Thread::current()->is_Code_cache_sweeper_thread(),
1157 "must be a non-entrant method if called from sweeper");
1158
1159 // Since the nmethod sweeper only does partial sweep the sweeper's traversal
1160 // count can be greater than the stack traversal count before it hits the
1161 // nmethod for the second time.
1162 // If an is_unloading() nmethod is still not_entrant, then it is not safe to
1163 // convert it to zombie due to GC unloading interactions. However, if it
1164 // has become unloaded, then it is okay to convert such nmethods to zombie.
1165 return stack_traversal_mark() + 1 < NMethodSweeper::traversal_count() &&
1166 !is_locked_by_vm() && (!is_unloading() || is_unloaded());
1167 }
1168
1169 void nmethod::inc_decompile_count() {
1170 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return;
1171 // Could be gated by ProfileTraps, but do not bother...
1172 Method* m = method();
1173 if (m == NULL) return;
1174 MethodData* mdo = m->method_data();
1175 if (mdo == NULL) return;
1176 // There is a benign race here. See comments in methodData.hpp.
1177 mdo->inc_decompile_count();
1178 }
1179
1180 bool nmethod::try_transition(int new_state_int) {
1181 signed char new_state = new_state_int;
1182 #ifdef ASSERT
1183 if (new_state != unloaded) {
1184 assert_lock_strong(CompiledMethod_lock);
1185 }
1186 #endif
1187 for (;;) {
1188 signed char old_state = Atomic::load(&_state);
1189 if (old_state >= new_state) {
1190 // Ensure monotonicity of transitions.
1191 return false;
1192 }
1193 if (Atomic::cmpxchg(&_state, old_state, new_state) == old_state) {
1194 return true;
1195 }
1196 }
1197 }
1198
1199 void nmethod::make_unloaded() {
1200 post_compiled_method_unload();
1201
1202 // This nmethod is being unloaded, make sure that dependencies
1203 // recorded in instanceKlasses get flushed.
1204 // Since this work is being done during a GC, defer deleting dependencies from the
1205 // InstanceKlass.
1206 assert(Universe::heap()->is_gc_active() ||
1207 Thread::current()->is_ConcurrentGC_thread() ||
1208 Thread::current()->is_Worker_thread(),
1209 "should only be called during gc");
1210 flush_dependencies(/*delete_immediately*/false);
1211
1212 // Break cycle between nmethod & method
1213 LogTarget(Trace, class, unload, nmethod) lt;
1214 if (lt.is_enabled()) {
1215 LogStream ls(lt);
1216 ls.print("making nmethod " INTPTR_FORMAT
1217 " unloadable, Method*(" INTPTR_FORMAT
1218 ") ",
1219 p2i(this), p2i(_method));
1220 ls.cr();
1221 }
1222 // Unlink the osr method, so we do not look this up again
1223 if (is_osr_method()) {
1224 // Invalidate the osr nmethod only once. Note that with concurrent
1225 // code cache unloading, OSR nmethods are invalidated before they
1226 // are made unloaded. Therefore, this becomes a no-op then.
1227 if (is_in_use()) {
1228 invalidate_osr_method();
1229 }
1230 #ifdef ASSERT
1231 if (method() != NULL) {
1232 // Make sure osr nmethod is invalidated, i.e. not on the list
1233 bool found = method()->method_holder()->remove_osr_nmethod(this);
1234 assert(!found, "osr nmethod should have been invalidated");
1235 }
1236 #endif
1237 }
1238
1239 // If _method is already NULL the Method* is about to be unloaded,
1240 // so we don't have to break the cycle. Note that it is possible to
1241 // have the Method* live here, in case we unload the nmethod because
1242 // it is pointing to some oop (other than the Method*) being unloaded.
1243 if (_method != NULL) {
1244 _method->unlink_code(this);
1245 }
1246
1247 // Make the class unloaded - i.e., change state and notify sweeper
1248 assert(SafepointSynchronize::is_at_safepoint() ||
1249 Thread::current()->is_ConcurrentGC_thread() ||
1250 Thread::current()->is_Worker_thread(),
1251 "must be at safepoint");
1252
1253 {
1254 // Clear ICStubs and release any CompiledICHolders.
1255 CompiledICLocker ml(this);
1256 clear_ic_callsites();
1257 }
1258
1259 // Unregister must be done before the state change
1260 {
1261 MutexLocker ml(SafepointSynchronize::is_at_safepoint() ? NULL : CodeCache_lock,
1262 Mutex::_no_safepoint_check_flag);
1263 Universe::heap()->unregister_nmethod(this);
1264 }
1265
1266 // Clear the method of this dead nmethod
1267 set_method(NULL);
1268
1269 // Log the unloading.
1270 log_state_change();
1271
1272 // The Method* is gone at this point
1273 assert(_method == NULL, "Tautology");
1274
1275 set_osr_link(NULL);
1276 NMethodSweeper::report_state_change(this);
1277
1278 bool transition_success = try_transition(unloaded);
1279
1280 // It is an important invariant that there exists no race between
1281 // the sweeper and GC thread competing for making the same nmethod
1282 // zombie and unloaded respectively. This is ensured by
1283 // can_convert_to_zombie() returning false for any is_unloading()
1284 // nmethod, informing the sweeper not to step on any GC toes.
1285 assert(transition_success, "Invalid nmethod transition to unloaded");
1286
1287 #if INCLUDE_JVMCI
1288 // Clear the link between this nmethod and a HotSpotNmethod mirror
1289 JVMCINMethodData* nmethod_data = jvmci_nmethod_data();
1290 if (nmethod_data != NULL) {
1291 nmethod_data->invalidate_nmethod_mirror(this);
1292 }
1293 #endif
1294 }
1295
1296 void nmethod::invalidate_osr_method() {
1297 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
1298 // Remove from list of active nmethods
1299 if (method() != NULL) {
1300 method()->method_holder()->remove_osr_nmethod(this);
1301 }
1302 }
1303
1304 void nmethod::log_state_change() const {
1305 if (LogCompilation) {
1306 if (xtty != NULL) {
1307 ttyLocker ttyl; // keep the following output all in one block
1308 if (_state == unloaded) {
1309 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'",
1310 os::current_thread_id());
1311 } else {
1312 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s",
1313 os::current_thread_id(),
1314 (_state == zombie ? " zombie='1'" : ""));
1315 }
1316 log_identity(xtty);
1317 xtty->stamp();
1318 xtty->end_elem();
1319 }
1320 }
1321
1322 const char *state_msg = _state == zombie ? "made zombie" : "made not entrant";
1323 CompileTask::print_ul(this, state_msg);
1324 if (PrintCompilation && _state != unloaded) {
1325 print_on(tty, state_msg);
1326 }
1327 }
1328
1329 void nmethod::unlink_from_method() {
1330 if (method() != NULL) {
1331 method()->unlink_code(this);
1332 }
1333 }
1334
1335 /**
1336 * Common functionality for both make_not_entrant and make_zombie
1337 */
1338 bool nmethod::make_not_entrant_or_zombie(int state) {
1339 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant");
1340
1341 if (Atomic::load(&_state) >= state) {
1342 // Avoid taking the lock if already in required state.
1343 // This is safe from races because the state is an end-state,
1344 // which the nmethod cannot back out of once entered.
1345 // No need for fencing either.
1346 return false;
1347 }
1348
1349 // Make sure the nmethod is not flushed.
1350 nmethodLocker nml(this);
1351 // This can be called while the system is already at a safepoint which is ok
1352 NoSafepointVerifier nsv;
1353
1354 // during patching, depending on the nmethod state we must notify the GC that
1355 // code has been unloaded, unregistering it. We cannot do this right while
1356 // holding the CompiledMethod_lock because we need to use the CodeCache_lock. This
1357 // would be prone to deadlocks.
1358 // This flag is used to remember whether we need to later lock and unregister.
1359 bool nmethod_needs_unregister = false;
1360
1361 {
1362 // Enter critical section. Does not block for safepoint.
1363 MutexLocker ml(CompiledMethod_lock->owned_by_self() ? NULL : CompiledMethod_lock, Mutex::_no_safepoint_check_flag);
1364
1365 // This logic is equivalent to the logic below for patching the
1366 // verified entry point of regular methods. We check that the
1367 // nmethod is in use to ensure that it is invalidated only once.
1368 if (is_osr_method() && is_in_use()) {
1369 // this effectively makes the osr nmethod not entrant
1370 invalidate_osr_method();
1371 }
1372
1373 if (Atomic::load(&_state) >= state) {
1374 // another thread already performed this transition so nothing
1375 // to do, but return false to indicate this.
1376 return false;
1377 }
1378
1379 // The caller can be calling the method statically or through an inline
1380 // cache call.
1381 if (!is_osr_method() && !is_not_entrant()) {
1382 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
1383 SharedRuntime::get_handle_wrong_method_stub());
1384 }
1385
1386 if (is_in_use() && update_recompile_counts()) {
1387 // It's a true state change, so mark the method as decompiled.
1388 // Do it only for transition from alive.
1389 inc_decompile_count();
1390 }
1391
1392 // If the state is becoming a zombie, signal to unregister the nmethod with
1393 // the heap.
1394 // This nmethod may have already been unloaded during a full GC.
1395 if ((state == zombie) && !is_unloaded()) {
1396 nmethod_needs_unregister = true;
1397 }
1398
1399 // Must happen before state change. Otherwise we have a race condition in
1400 // nmethod::can_convert_to_zombie(). I.e., a method can immediately
1401 // transition its state from 'not_entrant' to 'zombie' without having to wait
1402 // for stack scanning.
1403 if (state == not_entrant) {
1404 mark_as_seen_on_stack();
1405 OrderAccess::storestore(); // _stack_traversal_mark and _state
1406 }
1407
1408 // Change state
1409 if (!try_transition(state)) {
1410 // If the transition fails, it is due to another thread making the nmethod more
1411 // dead. In particular, one thread might be making the nmethod unloaded concurrently.
1412 // If so, having patched in the jump in the verified entry unnecessarily is fine.
1413 // The nmethod is no longer possible to call by Java threads.
1414 // Incrementing the decompile count is also fine as the caller of make_not_entrant()
1415 // had a valid reason to deoptimize the nmethod.
1416 // Marking the nmethod as seen on stack also has no effect, as the nmethod is now
1417 // !is_alive(), and the seen on stack value is only used to convert not_entrant
1418 // nmethods to zombie in can_convert_to_zombie().
1419 return false;
1420 }
1421
1422 // Log the transition once
1423 log_state_change();
1424
1425 // Remove nmethod from method.
1426 unlink_from_method();
1427
1428 } // leave critical region under CompiledMethod_lock
1429
1430 #if INCLUDE_JVMCI
1431 // Invalidate can't occur while holding the Patching lock
1432 JVMCINMethodData* nmethod_data = jvmci_nmethod_data();
1433 if (nmethod_data != NULL) {
1434 nmethod_data->invalidate_nmethod_mirror(this);
1435 }
1436 #endif
1437
1438 #ifdef ASSERT
1439 if (is_osr_method() && method() != NULL) {
1440 // Make sure osr nmethod is invalidated, i.e. not on the list
1441 bool found = method()->method_holder()->remove_osr_nmethod(this);
1442 assert(!found, "osr nmethod should have been invalidated");
1443 }
1444 #endif
1445
1446 // When the nmethod becomes zombie it is no longer alive so the
1447 // dependencies must be flushed. nmethods in the not_entrant
1448 // state will be flushed later when the transition to zombie
1449 // happens or they get unloaded.
1450 if (state == zombie) {
1451 {
1452 // Flushing dependencies must be done before any possible
1453 // safepoint can sneak in, otherwise the oops used by the
1454 // dependency logic could have become stale.
1455 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1456 if (nmethod_needs_unregister) {
1457 Universe::heap()->unregister_nmethod(this);
1458 }
1459 flush_dependencies(/*delete_immediately*/true);
1460 }
1461
1462 #if INCLUDE_JVMCI
1463 // Now that the nmethod has been unregistered, it's
1464 // safe to clear the HotSpotNmethod mirror oop.
1465 if (nmethod_data != NULL) {
1466 nmethod_data->clear_nmethod_mirror(this);
1467 }
1468 #endif
1469
1470 // Clear ICStubs to prevent back patching stubs of zombie or flushed
1471 // nmethods during the next safepoint (see ICStub::finalize), as well
1472 // as to free up CompiledICHolder resources.
1473 {
1474 CompiledICLocker ml(this);
1475 clear_ic_callsites();
1476 }
1477
1478 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload
1479 // event and it hasn't already been reported for this nmethod then
1480 // report it now. The event may have been reported earlier if the GC
1481 // marked it for unloading). JvmtiDeferredEventQueue support means
1482 // we no longer go to a safepoint here.
1483 post_compiled_method_unload();
1484
1485 #ifdef ASSERT
1486 // It's no longer safe to access the oops section since zombie
1487 // nmethods aren't scanned for GC.
1488 _oops_are_stale = true;
1489 #endif
1490 // the Method may be reclaimed by class unloading now that the
1491 // nmethod is in zombie state
1492 set_method(NULL);
1493 } else {
1494 assert(state == not_entrant, "other cases may need to be handled differently");
1495 }
1496
1497 if (TraceCreateZombies && state == zombie) {
1498 ResourceMark m;
1499 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");
1500 }
1501
1502 NMethodSweeper::report_state_change(this);
1503 return true;
1504 }
1505
1506 void nmethod::flush() {
1507 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1508 // Note that there are no valid oops in the nmethod anymore.
1509 assert(!is_osr_method() || is_unloaded() || is_zombie(),
1510 "osr nmethod must be unloaded or zombie before flushing");
1511 assert(is_zombie() || is_osr_method(), "must be a zombie method");
1512 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed");
1513 assert_locked_or_safepoint(CodeCache_lock);
1514
1515 // completely deallocate this method
1516 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, p2i(this));
1517 if (PrintMethodFlushing) {
1518 tty->print_cr("*flushing %s nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT
1519 "/Free CodeCache:" SIZE_FORMAT "Kb",
1520 is_osr_method() ? "osr" : "",_compile_id, p2i(this), CodeCache::blob_count(),
1521 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024);
1522 }
1523
1524 // We need to deallocate any ExceptionCache data.
1525 // Note that we do not need to grab the nmethod lock for this, it
1526 // better be thread safe if we're disposing of it!
1527 ExceptionCache* ec = exception_cache();
1528 set_exception_cache(NULL);
1529 while(ec != NULL) {
1530 ExceptionCache* next = ec->next();
1531 delete ec;
1532 ec = next;
1533 }
1534
1535 Universe::heap()->flush_nmethod(this);
1536 CodeCache::unregister_old_nmethod(this);
1537
1538 CodeBlob::flush();
1539 CodeCache::free(this);
1540 }
1541
1542 oop nmethod::oop_at(int index) const {
1543 if (index == 0) {
1544 return NULL;
1545 }
1546 return NativeAccess<AS_NO_KEEPALIVE>::oop_load(oop_addr_at(index));
1547 }
1548
1549 oop nmethod::oop_at_phantom(int index) const {
1550 if (index == 0) {
1551 return NULL;
1552 }
1553 return NativeAccess<ON_PHANTOM_OOP_REF>::oop_load(oop_addr_at(index));
1554 }
1555
1556 //
1557 // Notify all classes this nmethod is dependent on that it is no
1558 // longer dependent. This should only be called in two situations.
1559 // First, when a nmethod transitions to a zombie all dependents need
1560 // to be clear. Since zombification happens at a safepoint there's no
1561 // synchronization issues. The second place is a little more tricky.
1562 // During phase 1 of mark sweep class unloading may happen and as a
1563 // result some nmethods may get unloaded. In this case the flushing
1564 // of dependencies must happen during phase 1 since after GC any
1565 // dependencies in the unloaded nmethod won't be updated, so
1566 // traversing the dependency information in unsafe. In that case this
1567 // function is called with a boolean argument and this function only
1568 // notifies instanceKlasses that are reachable
1569
1570 void nmethod::flush_dependencies(bool delete_immediately) {
1571 DEBUG_ONLY(bool called_by_gc = Universe::heap()->is_gc_active() ||
1572 Thread::current()->is_ConcurrentGC_thread() ||
1573 Thread::current()->is_Worker_thread();)
1574 assert(called_by_gc != delete_immediately,
1575 "delete_immediately is false if and only if we are called during GC");
1576 if (!has_flushed_dependencies()) {
1577 set_has_flushed_dependencies();
1578 for (Dependencies::DepStream deps(this); deps.next(); ) {
1579 if (deps.type() == Dependencies::call_site_target_value) {
1580 // CallSite dependencies are managed on per-CallSite instance basis.
1581 oop call_site = deps.argument_oop(0);
1582 if (delete_immediately) {
1583 assert_locked_or_safepoint(CodeCache_lock);
1584 MethodHandles::remove_dependent_nmethod(call_site, this);
1585 } else {
1586 MethodHandles::clean_dependency_context(call_site);
1587 }
1588 } else {
1589 Klass* klass = deps.context_type();
1590 if (klass == NULL) {
1591 continue; // ignore things like evol_method
1592 }
1593 // During GC delete_immediately is false, and liveness
1594 // of dependee determines class that needs to be updated.
1595 if (delete_immediately) {
1596 assert_locked_or_safepoint(CodeCache_lock);
1597 InstanceKlass::cast(klass)->remove_dependent_nmethod(this);
1598 } else if (klass->is_loader_alive()) {
1599 // The GC may clean dependency contexts concurrently and in parallel.
1600 InstanceKlass::cast(klass)->clean_dependency_context();
1601 }
1602 }
1603 }
1604 }
1605 }
1606
1607 // ------------------------------------------------------------------
1608 // post_compiled_method_load_event
1609 // new method for install_code() path
1610 // Transfer information from compilation to jvmti
1611 void nmethod::post_compiled_method_load_event(JvmtiThreadState* state) {
1612
1613 // Don't post this nmethod load event if it is already dying
1614 // because the sweeper might already be deleting this nmethod.
1615 {
1616 MutexLocker ml(CompiledMethod_lock, Mutex::_no_safepoint_check_flag);
1617 // When the nmethod is acquired from the CodeCache iterator, it can racingly become zombie
1618 // before this code is called. Filter them out here under the CompiledMethod_lock.
1619 if (!is_alive()) {
1620 return;
1621 }
1622 // As for is_alive() nmethods, we also don't want them to racingly become zombie once we
1623 // release this lock, so we check that this is not going to be the case.
1624 if (is_not_entrant() && can_convert_to_zombie()) {
1625 return;
1626 }
1627 // Ensure the sweeper can't collect this nmethod until it become "active" with JvmtiThreadState::nmethods_do.
1628 mark_as_seen_on_stack();
1629 }
1630
1631 // This is a bad time for a safepoint. We don't want
1632 // this nmethod to get unloaded while we're queueing the event.
1633 NoSafepointVerifier nsv;
1634
1635 Method* m = method();
1636 HOTSPOT_COMPILED_METHOD_LOAD(
1637 (char *) m->klass_name()->bytes(),
1638 m->klass_name()->utf8_length(),
1639 (char *) m->name()->bytes(),
1640 m->name()->utf8_length(),
1641 (char *) m->signature()->bytes(),
1642 m->signature()->utf8_length(),
1643 insts_begin(), insts_size());
1644
1645
1646 if (JvmtiExport::should_post_compiled_method_load()) {
1647 // Only post unload events if load events are found.
1648 set_load_reported();
1649 // If a JavaThread hasn't been passed in, let the Service thread
1650 // (which is a real Java thread) post the event
1651 JvmtiDeferredEvent event = JvmtiDeferredEvent::compiled_method_load_event(this);
1652 if (state == NULL) {
1653 // Execute any barrier code for this nmethod as if it's called, since
1654 // keeping it alive looks like stack walking.
1655 run_nmethod_entry_barrier();
1656 ServiceThread::enqueue_deferred_event(&event);
1657 } else {
1658 // This enters the nmethod barrier outside in the caller.
1659 state->enqueue_event(&event);
1660 }
1661 }
1662 }
1663
1664 void nmethod::post_compiled_method_unload() {
1665 if (unload_reported()) {
1666 // During unloading we transition to unloaded and then to zombie
1667 // and the unloading is reported during the first transition.
1668 return;
1669 }
1670
1671 assert(_method != NULL && !is_unloaded(), "just checking");
1672 DTRACE_METHOD_UNLOAD_PROBE(method());
1673
1674 // If a JVMTI agent has enabled the CompiledMethodUnload event then
1675 // post the event. Sometime later this nmethod will be made a zombie
1676 // by the sweeper but the Method* will not be valid at that point.
1677 // The jmethodID is a weak reference to the Method* so if
1678 // it's being unloaded there's no way to look it up since the weak
1679 // ref will have been cleared.
1680
1681 // Don't bother posting the unload if the load event wasn't posted.
1682 if (load_reported() && JvmtiExport::should_post_compiled_method_unload()) {
1683 assert(!unload_reported(), "already unloaded");
1684 JvmtiDeferredEvent event =
1685 JvmtiDeferredEvent::compiled_method_unload_event(
1686 method()->jmethod_id(), insts_begin());
1687 ServiceThread::enqueue_deferred_event(&event);
1688 }
1689
1690 // The JVMTI CompiledMethodUnload event can be enabled or disabled at
1691 // any time. As the nmethod is being unloaded now we mark it has
1692 // having the unload event reported - this will ensure that we don't
1693 // attempt to report the event in the unlikely scenario where the
1694 // event is enabled at the time the nmethod is made a zombie.
1695 set_unload_reported();
1696 }
1697
1698 // Iterate over metadata calling this function. Used by RedefineClasses
1699 void nmethod::metadata_do(MetadataClosure* f) {
1700 {
1701 // Visit all immediate references that are embedded in the instruction stream.
1702 RelocIterator iter(this, oops_reloc_begin());
1703 while (iter.next()) {
1704 if (iter.type() == relocInfo::metadata_type) {
1705 metadata_Relocation* r = iter.metadata_reloc();
1706 // In this metadata, we must only follow those metadatas directly embedded in
1707 // the code. Other metadatas (oop_index>0) are seen as part of
1708 // the metadata section below.
1709 assert(1 == (r->metadata_is_immediate()) +
1710 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
1711 "metadata must be found in exactly one place");
1712 if (r->metadata_is_immediate() && r->metadata_value() != NULL) {
1713 Metadata* md = r->metadata_value();
1714 if (md != _method) f->do_metadata(md);
1715 }
1716 } else if (iter.type() == relocInfo::virtual_call_type) {
1717 // Check compiledIC holders associated with this nmethod
1718 ResourceMark rm;
1719 CompiledIC *ic = CompiledIC_at(&iter);
1720 if (ic->is_icholder_call()) {
1721 CompiledICHolder* cichk = ic->cached_icholder();
1722 f->do_metadata(cichk->holder_metadata());
1723 f->do_metadata(cichk->holder_klass());
1724 } else {
1725 Metadata* ic_oop = ic->cached_metadata();
1726 if (ic_oop != NULL) {
1727 f->do_metadata(ic_oop);
1728 }
1729 }
1730 }
1731 }
1732 }
1733
1734 // Visit the metadata section
1735 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
1736 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops
1737 Metadata* md = *p;
1738 f->do_metadata(md);
1739 }
1740
1741 // Visit metadata not embedded in the other places.
1742 if (_method != NULL) f->do_metadata(_method);
1743 }
1744
1745 // The _is_unloading_state encodes a tuple comprising the unloading cycle
1746 // and the result of IsUnloadingBehaviour::is_unloading() fpr that cycle.
1747 // This is the bit layout of the _is_unloading_state byte: 00000CCU
1748 // CC refers to the cycle, which has 2 bits, and U refers to the result of
1749 // IsUnloadingBehaviour::is_unloading() for that unloading cycle.
1750
1751 class IsUnloadingState: public AllStatic {
1752 static const uint8_t _is_unloading_mask = 1;
1753 static const uint8_t _is_unloading_shift = 0;
1754 static const uint8_t _unloading_cycle_mask = 6;
1755 static const uint8_t _unloading_cycle_shift = 1;
1756
1757 static uint8_t set_is_unloading(uint8_t state, bool value) {
1758 state &= ~_is_unloading_mask;
1759 if (value) {
1760 state |= 1 << _is_unloading_shift;
1761 }
1762 assert(is_unloading(state) == value, "unexpected unloading cycle overflow");
1763 return state;
1764 }
1765
1766 static uint8_t set_unloading_cycle(uint8_t state, uint8_t value) {
1767 state &= ~_unloading_cycle_mask;
1768 state |= value << _unloading_cycle_shift;
1769 assert(unloading_cycle(state) == value, "unexpected unloading cycle overflow");
1770 return state;
1771 }
1772
1773 public:
1774 static bool is_unloading(uint8_t state) { return (state & _is_unloading_mask) >> _is_unloading_shift == 1; }
1775 static uint8_t unloading_cycle(uint8_t state) { return (state & _unloading_cycle_mask) >> _unloading_cycle_shift; }
1776
1777 static uint8_t create(bool is_unloading, uint8_t unloading_cycle) {
1778 uint8_t state = 0;
1779 state = set_is_unloading(state, is_unloading);
1780 state = set_unloading_cycle(state, unloading_cycle);
1781 return state;
1782 }
1783 };
1784
1785 bool nmethod::is_unloading() {
1786 uint8_t state = RawAccess<MO_RELAXED>::load(&_is_unloading_state);
1787 bool state_is_unloading = IsUnloadingState::is_unloading(state);
1788 if (state_is_unloading) {
1789 return true;
1790 }
1791 uint8_t state_unloading_cycle = IsUnloadingState::unloading_cycle(state);
1792 uint8_t current_cycle = CodeCache::unloading_cycle();
1793 if (state_unloading_cycle == current_cycle) {
1794 return false;
1795 }
1796
1797 // The IsUnloadingBehaviour is responsible for checking if there are any dead
1798 // oops in the CompiledMethod, by calling oops_do on it.
1799 state_unloading_cycle = current_cycle;
1800
1801 if (is_zombie()) {
1802 // Zombies without calculated unloading epoch are never unloading due to GC.
1803
1804 // There are no races where a previously observed is_unloading() nmethod
1805 // suddenly becomes not is_unloading() due to here being observed as zombie.
1806
1807 // With STW unloading, all is_alive() && is_unloading() nmethods are unlinked
1808 // and unloaded in the safepoint. That makes races where an nmethod is first
1809 // observed as is_alive() && is_unloading() and subsequently observed as
1810 // is_zombie() impossible.
1811
1812 // With concurrent unloading, all references to is_unloading() nmethods are
1813 // first unlinked (e.g. IC caches and dependency contexts). Then a global
1814 // handshake operation is performed with all JavaThreads before finally
1815 // unloading the nmethods. The sweeper never converts is_alive() && is_unloading()
1816 // nmethods to zombies; it waits for them to become is_unloaded(). So before
1817 // the global handshake, it is impossible for is_unloading() nmethods to
1818 // racingly become is_zombie(). And is_unloading() is calculated for all is_alive()
1819 // nmethods before taking that global handshake, meaning that it will never
1820 // be recalculated after the handshake.
1821
1822 // After that global handshake, is_unloading() nmethods are only observable
1823 // to the iterators, and they will never trigger recomputation of the cached
1824 // is_unloading_state, and hence may not suffer from such races.
1825
1826 state_is_unloading = false;
1827 } else {
1828 state_is_unloading = IsUnloadingBehaviour::current()->is_unloading(this);
1829 }
1830
1831 state = IsUnloadingState::create(state_is_unloading, state_unloading_cycle);
1832
1833 RawAccess<MO_RELAXED>::store(&_is_unloading_state, state);
1834
1835 return state_is_unloading;
1836 }
1837
1838 void nmethod::clear_unloading_state() {
1839 uint8_t state = IsUnloadingState::create(false, CodeCache::unloading_cycle());
1840 RawAccess<MO_RELAXED>::store(&_is_unloading_state, state);
1841 }
1842
1843
1844 // This is called at the end of the strong tracing/marking phase of a
1845 // GC to unload an nmethod if it contains otherwise unreachable
1846 // oops.
1847
1848 void nmethod::do_unloading(bool unloading_occurred) {
1849 // Make sure the oop's ready to receive visitors
1850 assert(!is_zombie() && !is_unloaded(),
1851 "should not call follow on zombie or unloaded nmethod");
1852
1853 if (is_unloading()) {
1854 make_unloaded();
1855 } else {
1856 guarantee(unload_nmethod_caches(unloading_occurred),
1857 "Should not need transition stubs");
1858 }
1859 }
1860
1861 void nmethod::oops_do(OopClosure* f, bool allow_dead) {
1862 // make sure the oops ready to receive visitors
1863 assert(allow_dead || is_alive(), "should not call follow on dead nmethod");
1864
1865 // Prevent extra code cache walk for platforms that don't have immediate oops.
1866 if (relocInfo::mustIterateImmediateOopsInCode()) {
1867 RelocIterator iter(this, oops_reloc_begin());
1868
1869 while (iter.next()) {
1870 if (iter.type() == relocInfo::oop_type ) {
1871 oop_Relocation* r = iter.oop_reloc();
1872 // In this loop, we must only follow those oops directly embedded in
1873 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1874 assert(1 == (r->oop_is_immediate()) +
1875 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1876 "oop must be found in exactly one place");
1877 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1878 f->do_oop(r->oop_addr());
1879 }
1880 }
1881 }
1882 }
1883
1884 // Scopes
1885 // This includes oop constants not inlined in the code stream.
1886 for (oop* p = oops_begin(); p < oops_end(); p++) {
1887 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1888 f->do_oop(p);
1889 }
1890 }
1891
1892 nmethod* volatile nmethod::_oops_do_mark_nmethods;
1893
1894 void nmethod::oops_do_log_change(const char* state) {
1895 LogTarget(Trace, gc, nmethod) lt;
1896 if (lt.is_enabled()) {
1897 LogStream ls(lt);
1898 CompileTask::print(&ls, this, state, true /* short_form */);
1899 }
1900 }
1901
1902 bool nmethod::oops_do_try_claim() {
1903 if (oops_do_try_claim_weak_request()) {
1904 nmethod* result = oops_do_try_add_to_list_as_weak_done();
1905 assert(result == NULL, "adding to global list as weak done must always succeed.");
1906 return true;
1907 }
1908 return false;
1909 }
1910
1911 bool nmethod::oops_do_try_claim_weak_request() {
1912 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
1913
1914 if ((_oops_do_mark_link == NULL) &&
1915 (Atomic::replace_if_null(&_oops_do_mark_link, mark_link(this, claim_weak_request_tag)))) {
1916 oops_do_log_change("oops_do, mark weak request");
1917 return true;
1918 }
1919 return false;
1920 }
1921
1922 void nmethod::oops_do_set_strong_done(nmethod* old_head) {
1923 _oops_do_mark_link = mark_link(old_head, claim_strong_done_tag);
1924 }
1925
1926 nmethod::oops_do_mark_link* nmethod::oops_do_try_claim_strong_done() {
1927 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
1928
1929 oops_do_mark_link* old_next = Atomic::cmpxchg(&_oops_do_mark_link, mark_link(NULL, claim_weak_request_tag), mark_link(this, claim_strong_done_tag));
1930 if (old_next == NULL) {
1931 oops_do_log_change("oops_do, mark strong done");
1932 }
1933 return old_next;
1934 }
1935
1936 nmethod::oops_do_mark_link* nmethod::oops_do_try_add_strong_request(nmethod::oops_do_mark_link* next) {
1937 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
1938 assert(next == mark_link(this, claim_weak_request_tag), "Should be claimed as weak");
1939
1940 oops_do_mark_link* old_next = Atomic::cmpxchg(&_oops_do_mark_link, next, mark_link(this, claim_strong_request_tag));
1941 if (old_next == next) {
1942 oops_do_log_change("oops_do, mark strong request");
1943 }
1944 return old_next;
1945 }
1946
1947 bool nmethod::oops_do_try_claim_weak_done_as_strong_done(nmethod::oops_do_mark_link* next) {
1948 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
1949 assert(extract_state(next) == claim_weak_done_tag, "Should be claimed as weak done");
1950
1951 oops_do_mark_link* old_next = Atomic::cmpxchg(&_oops_do_mark_link, next, mark_link(extract_nmethod(next), claim_strong_done_tag));
1952 if (old_next == next) {
1953 oops_do_log_change("oops_do, mark weak done -> mark strong done");
1954 return true;
1955 }
1956 return false;
1957 }
1958
1959 nmethod* nmethod::oops_do_try_add_to_list_as_weak_done() {
1960 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
1961
1962 assert(extract_state(_oops_do_mark_link) == claim_weak_request_tag ||
1963 extract_state(_oops_do_mark_link) == claim_strong_request_tag,
1964 "must be but is nmethod " PTR_FORMAT " %u", p2i(extract_nmethod(_oops_do_mark_link)), extract_state(_oops_do_mark_link));
1965
1966 nmethod* old_head = Atomic::xchg(&_oops_do_mark_nmethods, this);
1967 // Self-loop if needed.
1968 if (old_head == NULL) {
1969 old_head = this;
1970 }
1971 // Try to install end of list and weak done tag.
1972 if (Atomic::cmpxchg(&_oops_do_mark_link, mark_link(this, claim_weak_request_tag), mark_link(old_head, claim_weak_done_tag)) == mark_link(this, claim_weak_request_tag)) {
1973 oops_do_log_change("oops_do, mark weak done");
1974 return NULL;
1975 } else {
1976 return old_head;
1977 }
1978 }
1979
1980 void nmethod::oops_do_add_to_list_as_strong_done() {
1981 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
1982
1983 nmethod* old_head = Atomic::xchg(&_oops_do_mark_nmethods, this);
1984 // Self-loop if needed.
1985 if (old_head == NULL) {
1986 old_head = this;
1987 }
1988 assert(_oops_do_mark_link == mark_link(this, claim_strong_done_tag), "must be but is nmethod " PTR_FORMAT " state %u",
1989 p2i(extract_nmethod(_oops_do_mark_link)), extract_state(_oops_do_mark_link));
1990
1991 oops_do_set_strong_done(old_head);
1992 }
1993
1994 void nmethod::oops_do_process_weak(OopsDoProcessor* p) {
1995 if (!oops_do_try_claim_weak_request()) {
1996 // Failed to claim for weak processing.
1997 oops_do_log_change("oops_do, mark weak request fail");
1998 return;
1999 }
2000
2001 p->do_regular_processing(this);
2002
2003 nmethod* old_head = oops_do_try_add_to_list_as_weak_done();
2004 if (old_head == NULL) {
2005 return;
2006 }
2007 oops_do_log_change("oops_do, mark weak done fail");
2008 // Adding to global list failed, another thread added a strong request.
2009 assert(extract_state(_oops_do_mark_link) == claim_strong_request_tag,
2010 "must be but is %u", extract_state(_oops_do_mark_link));
2011
2012 oops_do_log_change("oops_do, mark weak request -> mark strong done");
2013
2014 oops_do_set_strong_done(old_head);
2015 // Do missing strong processing.
2016 p->do_remaining_strong_processing(this);
2017 }
2018
2019 void nmethod::oops_do_process_strong(OopsDoProcessor* p) {
2020 oops_do_mark_link* next_raw = oops_do_try_claim_strong_done();
2021 if (next_raw == NULL) {
2022 p->do_regular_processing(this);
2023 oops_do_add_to_list_as_strong_done();
2024 return;
2025 }
2026 // Claim failed. Figure out why and handle it.
2027 if (oops_do_has_weak_request(next_raw)) {
2028 oops_do_mark_link* old = next_raw;
2029 // Claim failed because being weak processed (state == "weak request").
2030 // Try to request deferred strong processing.
2031 next_raw = oops_do_try_add_strong_request(old);
2032 if (next_raw == old) {
2033 // Successfully requested deferred strong processing.
2034 return;
2035 }
2036 // Failed because of a concurrent transition. No longer in "weak request" state.
2037 }
2038 if (oops_do_has_any_strong_state(next_raw)) {
2039 // Already claimed for strong processing or requested for such.
2040 return;
2041 }
2042 if (oops_do_try_claim_weak_done_as_strong_done(next_raw)) {
2043 // Successfully claimed "weak done" as "strong done". Do the missing marking.
2044 p->do_remaining_strong_processing(this);
2045 return;
2046 }
2047 // Claim failed, some other thread got it.
2048 }
2049
2050 void nmethod::oops_do_marking_prologue() {
2051 assert_at_safepoint();
2052
2053 log_trace(gc, nmethod)("oops_do_marking_prologue");
2054 assert(_oops_do_mark_nmethods == NULL, "must be empty");
2055 }
2056
2057 void nmethod::oops_do_marking_epilogue() {
2058 assert_at_safepoint();
2059
2060 nmethod* next = _oops_do_mark_nmethods;
2061 _oops_do_mark_nmethods = NULL;
2062 if (next != NULL) {
2063 nmethod* cur;
2064 do {
2065 cur = next;
2066 next = extract_nmethod(cur->_oops_do_mark_link);
2067 cur->_oops_do_mark_link = NULL;
2068 DEBUG_ONLY(cur->verify_oop_relocations());
2069
2070 LogTarget(Trace, gc, nmethod) lt;
2071 if (lt.is_enabled()) {
2072 LogStream ls(lt);
2073 CompileTask::print(&ls, cur, "oops_do, unmark", /*short_form:*/ true);
2074 }
2075 // End if self-loop has been detected.
2076 } while (cur != next);
2077 }
2078 log_trace(gc, nmethod)("oops_do_marking_epilogue");
2079 }
2080
2081 inline bool includes(void* p, void* from, void* to) {
2082 return from <= p && p < to;
2083 }
2084
2085
2086 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
2087 assert(count >= 2, "must be sentinel values, at least");
2088
2089 #ifdef ASSERT
2090 // must be sorted and unique; we do a binary search in find_pc_desc()
2091 int prev_offset = pcs[0].pc_offset();
2092 assert(prev_offset == PcDesc::lower_offset_limit,
2093 "must start with a sentinel");
2094 for (int i = 1; i < count; i++) {
2095 int this_offset = pcs[i].pc_offset();
2096 assert(this_offset > prev_offset, "offsets must be sorted");
2097 prev_offset = this_offset;
2098 }
2099 assert(prev_offset == PcDesc::upper_offset_limit,
2100 "must end with a sentinel");
2101 #endif //ASSERT
2102
2103 // Search for MethodHandle invokes and tag the nmethod.
2104 for (int i = 0; i < count; i++) {
2105 if (pcs[i].is_method_handle_invoke()) {
2106 set_has_method_handle_invokes(true);
2107 break;
2108 }
2109 }
2110 assert(has_method_handle_invokes() == (_deopt_mh_handler_begin != NULL), "must have deopt mh handler");
2111
2112 int size = count * sizeof(PcDesc);
2113 assert(scopes_pcs_size() >= size, "oob");
2114 memcpy(scopes_pcs_begin(), pcs, size);
2115
2116 // Adjust the final sentinel downward.
2117 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
2118 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
2119 last_pc->set_pc_offset(content_size() + 1);
2120 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
2121 // Fill any rounding gaps with copies of the last record.
2122 last_pc[1] = last_pc[0];
2123 }
2124 // The following assert could fail if sizeof(PcDesc) is not
2125 // an integral multiple of oopSize (the rounding term).
2126 // If it fails, change the logic to always allocate a multiple
2127 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
2128 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
2129 }
2130
2131 void nmethod::copy_scopes_data(u_char* buffer, int size) {
2132 assert(scopes_data_size() >= size, "oob");
2133 memcpy(scopes_data_begin(), buffer, size);
2134 }
2135
2136 #ifdef ASSERT
2137 static PcDesc* linear_search(const PcDescSearch& search, int pc_offset, bool approximate) {
2138 PcDesc* lower = search.scopes_pcs_begin();
2139 PcDesc* upper = search.scopes_pcs_end();
2140 lower += 1; // exclude initial sentinel
2141 PcDesc* res = NULL;
2142 for (PcDesc* p = lower; p < upper; p++) {
2143 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc
2144 if (match_desc(p, pc_offset, approximate)) {
2145 if (res == NULL)
2146 res = p;
2147 else
2148 res = (PcDesc*) badAddress;
2149 }
2150 }
2151 return res;
2152 }
2153 #endif
2154
2155
2156 // Finds a PcDesc with real-pc equal to "pc"
2157 PcDesc* PcDescContainer::find_pc_desc_internal(address pc, bool approximate, const PcDescSearch& search) {
2158 address base_address = search.code_begin();
2159 if ((pc < base_address) ||
2160 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
2161 return NULL; // PC is wildly out of range
2162 }
2163 int pc_offset = (int) (pc - base_address);
2164
2165 // Check the PcDesc cache if it contains the desired PcDesc
2166 // (This as an almost 100% hit rate.)
2167 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
2168 if (res != NULL) {
2169 assert(res == linear_search(search, pc_offset, approximate), "cache ok");
2170 return res;
2171 }
2172
2173 // Fallback algorithm: quasi-linear search for the PcDesc
2174 // Find the last pc_offset less than the given offset.
2175 // The successor must be the required match, if there is a match at all.
2176 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
2177 PcDesc* lower = search.scopes_pcs_begin();
2178 PcDesc* upper = search.scopes_pcs_end();
2179 upper -= 1; // exclude final sentinel
2180 if (lower >= upper) return NULL; // native method; no PcDescs at all
2181
2182 #define assert_LU_OK \
2183 /* invariant on lower..upper during the following search: */ \
2184 assert(lower->pc_offset() < pc_offset, "sanity"); \
2185 assert(upper->pc_offset() >= pc_offset, "sanity")
2186 assert_LU_OK;
2187
2188 // Use the last successful return as a split point.
2189 PcDesc* mid = _pc_desc_cache.last_pc_desc();
2190 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
2191 if (mid->pc_offset() < pc_offset) {
2192 lower = mid;
2193 } else {
2194 upper = mid;
2195 }
2196
2197 // Take giant steps at first (4096, then 256, then 16, then 1)
2198 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
2199 const int RADIX = (1 << LOG2_RADIX);
2200 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
2201 while ((mid = lower + step) < upper) {
2202 assert_LU_OK;
2203 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
2204 if (mid->pc_offset() < pc_offset) {
2205 lower = mid;
2206 } else {
2207 upper = mid;
2208 break;
2209 }
2210 }
2211 assert_LU_OK;
2212 }
2213
2214 // Sneak up on the value with a linear search of length ~16.
2215 while (true) {
2216 assert_LU_OK;
2217 mid = lower + 1;
2218 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
2219 if (mid->pc_offset() < pc_offset) {
2220 lower = mid;
2221 } else {
2222 upper = mid;
2223 break;
2224 }
2225 }
2226 #undef assert_LU_OK
2227
2228 if (match_desc(upper, pc_offset, approximate)) {
2229 assert(upper == linear_search(search, pc_offset, approximate), "search ok");
2230 _pc_desc_cache.add_pc_desc(upper);
2231 return upper;
2232 } else {
2233 assert(NULL == linear_search(search, pc_offset, approximate), "search ok");
2234 return NULL;
2235 }
2236 }
2237
2238
2239 void nmethod::check_all_dependencies(DepChange& changes) {
2240 // Checked dependencies are allocated into this ResourceMark
2241 ResourceMark rm;
2242
2243 // Turn off dependency tracing while actually testing dependencies.
2244 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) );
2245
2246 typedef ResourceHashtable<DependencySignature, int, 11027,
2247 ResourceObj::RESOURCE_AREA, mtInternal,
2248 &DependencySignature::hash,
2249 &DependencySignature::equals> DepTable;
2250
2251 DepTable* table = new DepTable();
2252
2253 // Iterate over live nmethods and check dependencies of all nmethods that are not
2254 // marked for deoptimization. A particular dependency is only checked once.
2255 NMethodIterator iter(NMethodIterator::only_alive_and_not_unloading);
2256 while(iter.next()) {
2257 nmethod* nm = iter.method();
2258 // Only notify for live nmethods
2259 if (!nm->is_marked_for_deoptimization()) {
2260 for (Dependencies::DepStream deps(nm); deps.next(); ) {
2261 // Construct abstraction of a dependency.
2262 DependencySignature* current_sig = new DependencySignature(deps);
2263
2264 // Determine if dependency is already checked. table->put(...) returns
2265 // 'true' if the dependency is added (i.e., was not in the hashtable).
2266 if (table->put(*current_sig, 1)) {
2267 if (deps.check_dependency() != NULL) {
2268 // Dependency checking failed. Print out information about the failed
2269 // dependency and finally fail with an assert. We can fail here, since
2270 // dependency checking is never done in a product build.
2271 tty->print_cr("Failed dependency:");
2272 changes.print();
2273 nm->print();
2274 nm->print_dependencies();
2275 assert(false, "Should have been marked for deoptimization");
2276 }
2277 }
2278 }
2279 }
2280 }
2281 }
2282
2283 bool nmethod::check_dependency_on(DepChange& changes) {
2284 // What has happened:
2285 // 1) a new class dependee has been added
2286 // 2) dependee and all its super classes have been marked
2287 bool found_check = false; // set true if we are upset
2288 for (Dependencies::DepStream deps(this); deps.next(); ) {
2289 // Evaluate only relevant dependencies.
2290 if (deps.spot_check_dependency_at(changes) != NULL) {
2291 found_check = true;
2292 NOT_DEBUG(break);
2293 }
2294 }
2295 return found_check;
2296 }
2297
2298 // Called from mark_for_deoptimization, when dependee is invalidated.
2299 bool nmethod::is_dependent_on_method(Method* dependee) {
2300 for (Dependencies::DepStream deps(this); deps.next(); ) {
2301 if (deps.type() != Dependencies::evol_method)
2302 continue;
2303 Method* method = deps.method_argument(0);
2304 if (method == dependee) return true;
2305 }
2306 return false;
2307 }
2308
2309
2310 bool nmethod::is_patchable_at(address instr_addr) {
2311 assert(insts_contains(instr_addr), "wrong nmethod used");
2312 if (is_zombie()) {
2313 // a zombie may never be patched
2314 return false;
2315 }
2316 return true;
2317 }
2318
2319
2320 void nmethod_init() {
2321 // make sure you didn't forget to adjust the filler fields
2322 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
2323 }
2324
2325
2326 //-------------------------------------------------------------------------------------------
2327
2328
2329 // QQQ might we make this work from a frame??
2330 nmethodLocker::nmethodLocker(address pc) {
2331 CodeBlob* cb = CodeCache::find_blob(pc);
2332 guarantee(cb != NULL && cb->is_compiled(), "bad pc for a nmethod found");
2333 _nm = cb->as_compiled_method();
2334 lock_nmethod(_nm);
2335 }
2336
2337 // Only JvmtiDeferredEvent::compiled_method_unload_event()
2338 // should pass zombie_ok == true.
2339 void nmethodLocker::lock_nmethod(CompiledMethod* cm, bool zombie_ok) {
2340 if (cm == NULL) return;
2341 nmethod* nm = cm->as_nmethod();
2342 Atomic::inc(&nm->_lock_count);
2343 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method: %p", nm);
2344 }
2345
2346 void nmethodLocker::unlock_nmethod(CompiledMethod* cm) {
2347 if (cm == NULL) return;
2348 nmethod* nm = cm->as_nmethod();
2349 Atomic::dec(&nm->_lock_count);
2350 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock");
2351 }
2352
2353
2354 // -----------------------------------------------------------------------------
2355 // Verification
2356
2357 class VerifyOopsClosure: public OopClosure {
2358 nmethod* _nm;
2359 bool _ok;
2360 public:
2361 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
2362 bool ok() { return _ok; }
2363 virtual void do_oop(oop* p) {
2364 if (oopDesc::is_oop_or_null(*p)) return;
2365 // Print diagnostic information before calling print_nmethod().
2366 // Assertions therein might prevent call from returning.
2367 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2368 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2369 if (_ok) {
2370 _nm->print_nmethod(true);
2371 _ok = false;
2372 }
2373 }
2374 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2375 };
2376
2377 class VerifyMetadataClosure: public MetadataClosure {
2378 public:
2379 void do_metadata(Metadata* md) {
2380 if (md->is_method()) {
2381 Method* method = (Method*)md;
2382 assert(!method->is_old(), "Should not be installing old methods");
2383 }
2384 }
2385 };
2386
2387
2388 void nmethod::verify() {
2389
2390 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant
2391 // seems odd.
2392
2393 if (is_zombie() || is_not_entrant() || is_unloaded())
2394 return;
2395
2396 // Make sure all the entry points are correctly aligned for patching.
2397 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
2398
2399 // assert(oopDesc::is_oop(method()), "must be valid");
2400
2401 ResourceMark rm;
2402
2403 if (!CodeCache::contains(this)) {
2404 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this));
2405 }
2406
2407 if(is_native_method() )
2408 return;
2409
2410 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
2411 if (nm != this) {
2412 fatal("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this));
2413 }
2414
2415 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2416 if (! p->verify(this)) {
2417 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this));
2418 }
2419 }
2420
2421 #ifdef ASSERT
2422 #if INCLUDE_JVMCI
2423 {
2424 // Verify that implicit exceptions that deoptimize have a PcDesc and OopMap
2425 ImmutableOopMapSet* oms = oop_maps();
2426 ImplicitExceptionTable implicit_table(this);
2427 for (uint i = 0; i < implicit_table.len(); i++) {
2428 int exec_offset = (int) implicit_table.get_exec_offset(i);
2429 if (implicit_table.get_exec_offset(i) == implicit_table.get_cont_offset(i)) {
2430 assert(pc_desc_at(code_begin() + exec_offset) != NULL, "missing PcDesc");
2431 bool found = false;
2432 for (int i = 0, imax = oms->count(); i < imax; i++) {
2433 if (oms->pair_at(i)->pc_offset() == exec_offset) {
2434 found = true;
2435 break;
2436 }
2437 }
2438 assert(found, "missing oopmap");
2439 }
2440 }
2441 }
2442 #endif
2443 #endif
2444
2445 VerifyOopsClosure voc(this);
2446 oops_do(&voc);
2447 assert(voc.ok(), "embedded oops must be OK");
2448 Universe::heap()->verify_nmethod(this);
2449
2450 assert(_oops_do_mark_link == NULL, "_oops_do_mark_link for %s should be NULL but is " PTR_FORMAT,
2451 nm->method()->external_name(), p2i(_oops_do_mark_link));
2452 verify_scopes();
2453
2454 CompiledICLocker nm_verify(this);
2455 VerifyMetadataClosure vmc;
2456 metadata_do(&vmc);
2457 }
2458
2459
2460 void nmethod::verify_interrupt_point(address call_site) {
2461
2462 // Verify IC only when nmethod installation is finished.
2463 if (!is_not_installed()) {
2464 if (CompiledICLocker::is_safe(this)) {
2465 CompiledIC_at(this, call_site);
2466 } else {
2467 CompiledICLocker ml_verify(this);
2468 CompiledIC_at(this, call_site);
2469 }
2470 }
2471
2472 HandleMark hm(Thread::current());
2473
2474 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address());
2475 assert(pd != NULL, "PcDesc must exist");
2476 for (ScopeDesc* sd = new ScopeDesc(this, pd);
2477 !sd->is_top(); sd = sd->sender()) {
2478 sd->verify();
2479 }
2480 }
2481
2482 void nmethod::verify_scopes() {
2483 if( !method() ) return; // Runtime stubs have no scope
2484 if (method()->is_native()) return; // Ignore stub methods.
2485 // iterate through all interrupt point
2486 // and verify the debug information is valid.
2487 RelocIterator iter((nmethod*)this);
2488 while (iter.next()) {
2489 address stub = NULL;
2490 switch (iter.type()) {
2491 case relocInfo::virtual_call_type:
2492 verify_interrupt_point(iter.addr());
2493 break;
2494 case relocInfo::opt_virtual_call_type:
2495 stub = iter.opt_virtual_call_reloc()->static_stub();
2496 verify_interrupt_point(iter.addr());
2497 break;
2498 case relocInfo::static_call_type:
2499 stub = iter.static_call_reloc()->static_stub();
2500 //verify_interrupt_point(iter.addr());
2501 break;
2502 case relocInfo::runtime_call_type:
2503 case relocInfo::runtime_call_w_cp_type: {
2504 address destination = iter.reloc()->value();
2505 // Right now there is no way to find out which entries support
2506 // an interrupt point. It would be nice if we had this
2507 // information in a table.
2508 break;
2509 }
2510 default:
2511 break;
2512 }
2513 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section");
2514 }
2515 }
2516
2517
2518 // -----------------------------------------------------------------------------
2519 // Printing operations
2520
2521 void nmethod::print() const {
2522 ttyLocker ttyl; // keep the following output all in one block
2523 print(tty);
2524 }
2525
2526 void nmethod::print(outputStream* st) const {
2527 ResourceMark rm;
2528
2529 st->print("Compiled method ");
2530
2531 if (is_compiled_by_c1()) {
2532 st->print("(c1) ");
2533 } else if (is_compiled_by_c2()) {
2534 st->print("(c2) ");
2535 } else if (is_compiled_by_jvmci()) {
2536 st->print("(JVMCI) ");
2537 } else {
2538 st->print("(n/a) ");
2539 }
2540
2541 print_on(st, NULL);
2542
2543 if (WizardMode) {
2544 st->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this));
2545 st->print(" for method " INTPTR_FORMAT , p2i(method()));
2546 st->print(" { ");
2547 st->print_cr("%s ", state());
2548 st->print_cr("}:");
2549 }
2550 if (size () > 0) st->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2551 p2i(this),
2552 p2i(this) + size(),
2553 size());
2554 if (relocation_size () > 0) st->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2555 p2i(relocation_begin()),
2556 p2i(relocation_end()),
2557 relocation_size());
2558 if (consts_size () > 0) st->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2559 p2i(consts_begin()),
2560 p2i(consts_end()),
2561 consts_size());
2562 if (insts_size () > 0) st->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2563 p2i(insts_begin()),
2564 p2i(insts_end()),
2565 insts_size());
2566 if (stub_size () > 0) st->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2567 p2i(stub_begin()),
2568 p2i(stub_end()),
2569 stub_size());
2570 if (oops_size () > 0) st->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2571 p2i(oops_begin()),
2572 p2i(oops_end()),
2573 oops_size());
2574 if (metadata_size () > 0) st->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2575 p2i(metadata_begin()),
2576 p2i(metadata_end()),
2577 metadata_size());
2578 if (scopes_data_size () > 0) st->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2579 p2i(scopes_data_begin()),
2580 p2i(scopes_data_end()),
2581 scopes_data_size());
2582 if (scopes_pcs_size () > 0) st->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2583 p2i(scopes_pcs_begin()),
2584 p2i(scopes_pcs_end()),
2585 scopes_pcs_size());
2586 if (dependencies_size () > 0) st->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2587 p2i(dependencies_begin()),
2588 p2i(dependencies_end()),
2589 dependencies_size());
2590 if (handler_table_size() > 0) st->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2591 p2i(handler_table_begin()),
2592 p2i(handler_table_end()),
2593 handler_table_size());
2594 if (nul_chk_table_size() > 0) st->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2595 p2i(nul_chk_table_begin()),
2596 p2i(nul_chk_table_end()),
2597 nul_chk_table_size());
2598 #if INCLUDE_JVMCI
2599 if (speculations_size () > 0) st->print_cr(" speculations [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2600 p2i(speculations_begin()),
2601 p2i(speculations_end()),
2602 speculations_size());
2603 if (jvmci_data_size () > 0) st->print_cr(" JVMCI data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2604 p2i(jvmci_data_begin()),
2605 p2i(jvmci_data_end()),
2606 jvmci_data_size());
2607 #endif
2608 }
2609
2610 void nmethod::print_code() {
2611 ResourceMark m;
2612 ttyLocker ttyl;
2613 // Call the specialized decode method of this class.
2614 decode(tty);
2615 }
2616
2617 #ifndef PRODUCT // called InstanceKlass methods are available only then. Declared as PRODUCT_RETURN
2618
2619 void nmethod::print_dependencies() {
2620 ResourceMark rm;
2621 ttyLocker ttyl; // keep the following output all in one block
2622 tty->print_cr("Dependencies:");
2623 for (Dependencies::DepStream deps(this); deps.next(); ) {
2624 deps.print_dependency();
2625 Klass* ctxk = deps.context_type();
2626 if (ctxk != NULL) {
2627 if (ctxk->is_instance_klass() && InstanceKlass::cast(ctxk)->is_dependent_nmethod(this)) {
2628 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name());
2629 }
2630 }
2631 deps.log_dependency(); // put it into the xml log also
2632 }
2633 }
2634 #endif
2635
2636 #if defined(SUPPORT_DATA_STRUCTS)
2637
2638 // Print the oops from the underlying CodeBlob.
2639 void nmethod::print_oops(outputStream* st) {
2640 ResourceMark m;
2641 st->print("Oops:");
2642 if (oops_begin() < oops_end()) {
2643 st->cr();
2644 for (oop* p = oops_begin(); p < oops_end(); p++) {
2645 Disassembler::print_location((unsigned char*)p, (unsigned char*)oops_begin(), (unsigned char*)oops_end(), st, true, false);
2646 st->print(PTR_FORMAT " ", *((uintptr_t*)p));
2647 if (Universe::contains_non_oop_word(p)) {
2648 st->print_cr("NON_OOP");
2649 continue; // skip non-oops
2650 }
2651 if (*p == NULL) {
2652 st->print_cr("NULL-oop");
2653 continue; // skip non-oops
2654 }
2655 (*p)->print_value_on(st);
2656 st->cr();
2657 }
2658 } else {
2659 st->print_cr(" <list empty>");
2660 }
2661 }
2662
2663 // Print metadata pool.
2664 void nmethod::print_metadata(outputStream* st) {
2665 ResourceMark m;
2666 st->print("Metadata:");
2667 if (metadata_begin() < metadata_end()) {
2668 st->cr();
2669 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
2670 Disassembler::print_location((unsigned char*)p, (unsigned char*)metadata_begin(), (unsigned char*)metadata_end(), st, true, false);
2671 st->print(PTR_FORMAT " ", *((uintptr_t*)p));
2672 if (*p && *p != Universe::non_oop_word()) {
2673 (*p)->print_value_on(st);
2674 }
2675 st->cr();
2676 }
2677 } else {
2678 st->print_cr(" <list empty>");
2679 }
2680 }
2681
2682 #ifndef PRODUCT // ScopeDesc::print_on() is available only then. Declared as PRODUCT_RETURN
2683 void nmethod::print_scopes_on(outputStream* st) {
2684 // Find the first pc desc for all scopes in the code and print it.
2685 ResourceMark rm;
2686 st->print("scopes:");
2687 if (scopes_pcs_begin() < scopes_pcs_end()) {
2688 st->cr();
2689 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2690 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
2691 continue;
2692
2693 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
2694 while (sd != NULL) {
2695 sd->print_on(st, p); // print output ends with a newline
2696 sd = sd->sender();
2697 }
2698 }
2699 } else {
2700 st->print_cr(" <list empty>");
2701 }
2702 }
2703 #endif
2704
2705 #ifndef PRODUCT // RelocIterator does support printing only then.
2706 void nmethod::print_relocations() {
2707 ResourceMark m; // in case methods get printed via the debugger
2708 tty->print_cr("relocations:");
2709 RelocIterator iter(this);
2710 iter.print();
2711 }
2712 #endif
2713
2714 void nmethod::print_pcs_on(outputStream* st) {
2715 ResourceMark m; // in case methods get printed via debugger
2716 st->print("pc-bytecode offsets:");
2717 if (scopes_pcs_begin() < scopes_pcs_end()) {
2718 st->cr();
2719 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2720 p->print_on(st, this); // print output ends with a newline
2721 }
2722 } else {
2723 st->print_cr(" <list empty>");
2724 }
2725 }
2726
2727 void nmethod::print_native_invokers() {
2728 ResourceMark m; // in case methods get printed via debugger
2729 tty->print_cr("Native invokers:");
2730 for (RuntimeStub** itt = native_invokers_begin(); itt < native_invokers_end(); itt++) {
2731 (*itt)->print_on(tty);
2732 }
2733 }
2734
2735 void nmethod::print_handler_table() {
2736 ExceptionHandlerTable(this).print(code_begin());
2737 }
2738
2739 void nmethod::print_nul_chk_table() {
2740 ImplicitExceptionTable(this).print(code_begin());
2741 }
2742
2743 void nmethod::print_recorded_oop(int log_n, int i) {
2744 void* value;
2745
2746 if (i == 0) {
2747 value = NULL;
2748 } else {
2749 // Be careful around non-oop words. Don't create an oop
2750 // with that value, or it will assert in verification code.
2751 if (Universe::contains_non_oop_word(oop_addr_at(i))) {
2752 value = Universe::non_oop_word();
2753 } else {
2754 value = oop_at(i);
2755 }
2756 }
2757
2758 tty->print("#%*d: " INTPTR_FORMAT " ", log_n, i, p2i(value));
2759
2760 if (value == Universe::non_oop_word()) {
2761 tty->print("non-oop word");
2762 } else {
2763 if (value == 0) {
2764 tty->print("NULL-oop");
2765 } else {
2766 oop_at(i)->print_value_on(tty);
2767 }
2768 }
2769
2770 tty->cr();
2771 }
2772
2773 void nmethod::print_recorded_oops() {
2774 const int n = oops_count();
2775 const int log_n = (n<10) ? 1 : (n<100) ? 2 : (n<1000) ? 3 : (n<10000) ? 4 : 6;
2776 tty->print("Recorded oops:");
2777 if (n > 0) {
2778 tty->cr();
2779 for (int i = 0; i < n; i++) {
2780 print_recorded_oop(log_n, i);
2781 }
2782 } else {
2783 tty->print_cr(" <list empty>");
2784 }
2785 }
2786
2787 void nmethod::print_recorded_metadata() {
2788 const int n = metadata_count();
2789 const int log_n = (n<10) ? 1 : (n<100) ? 2 : (n<1000) ? 3 : (n<10000) ? 4 : 6;
2790 tty->print("Recorded metadata:");
2791 if (n > 0) {
2792 tty->cr();
2793 for (int i = 0; i < n; i++) {
2794 Metadata* m = metadata_at(i);
2795 tty->print("#%*d: " INTPTR_FORMAT " ", log_n, i, p2i(m));
2796 if (m == (Metadata*)Universe::non_oop_word()) {
2797 tty->print("non-metadata word");
2798 } else if (m == NULL) {
2799 tty->print("NULL-oop");
2800 } else {
2801 Metadata::print_value_on_maybe_null(tty, m);
2802 }
2803 tty->cr();
2804 }
2805 } else {
2806 tty->print_cr(" <list empty>");
2807 }
2808 }
2809 #endif
2810
2811 #if defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_ABSTRACT_ASSEMBLY)
2812
2813 void nmethod::print_constant_pool(outputStream* st) {
2814 //-----------------------------------
2815 //---< Print the constant pool >---
2816 //-----------------------------------
2817 int consts_size = this->consts_size();
2818 if ( consts_size > 0 ) {
2819 unsigned char* cstart = this->consts_begin();
2820 unsigned char* cp = cstart;
2821 unsigned char* cend = cp + consts_size;
2822 unsigned int bytes_per_line = 4;
2823 unsigned int CP_alignment = 8;
2824 unsigned int n;
2825
2826 st->cr();
2827
2828 //---< print CP header to make clear what's printed >---
2829 if( ((uintptr_t)cp&(CP_alignment-1)) == 0 ) {
2830 n = bytes_per_line;
2831 st->print_cr("[Constant Pool]");
2832 Disassembler::print_location(cp, cstart, cend, st, true, true);
2833 Disassembler::print_hexdata(cp, n, st, true);
2834 st->cr();
2835 } else {
2836 n = (uintptr_t)cp&(bytes_per_line-1);
2837 st->print_cr("[Constant Pool (unaligned)]");
2838 }
2839
2840 //---< print CP contents, bytes_per_line at a time >---
2841 while (cp < cend) {
2842 Disassembler::print_location(cp, cstart, cend, st, true, false);
2843 Disassembler::print_hexdata(cp, n, st, false);
2844 cp += n;
2845 n = bytes_per_line;
2846 st->cr();
2847 }
2848
2849 //---< Show potential alignment gap between constant pool and code >---
2850 cend = code_begin();
2851 if( cp < cend ) {
2852 n = 4;
2853 st->print_cr("[Code entry alignment]");
2854 while (cp < cend) {
2855 Disassembler::print_location(cp, cstart, cend, st, false, false);
2856 cp += n;
2857 st->cr();
2858 }
2859 }
2860 } else {
2861 st->print_cr("[Constant Pool (empty)]");
2862 }
2863 st->cr();
2864 }
2865
2866 #endif
2867
2868 // Disassemble this nmethod.
2869 // Print additional debug information, if requested. This could be code
2870 // comments, block comments, profiling counters, etc.
2871 // The undisassembled format is useful no disassembler library is available.
2872 // The resulting hex dump (with markers) can be disassembled later, or on
2873 // another system, when/where a disassembler library is available.
2874 void nmethod::decode2(outputStream* ost) const {
2875
2876 // Called from frame::back_trace_with_decode without ResourceMark.
2877 ResourceMark rm;
2878
2879 // Make sure we have a valid stream to print on.
2880 outputStream* st = ost ? ost : tty;
2881
2882 #if defined(SUPPORT_ABSTRACT_ASSEMBLY) && ! defined(SUPPORT_ASSEMBLY)
2883 const bool use_compressed_format = true;
2884 const bool compressed_with_comments = use_compressed_format && (AbstractDisassembler::show_comment() ||
2885 AbstractDisassembler::show_block_comment());
2886 #else
2887 const bool use_compressed_format = Disassembler::is_abstract();
2888 const bool compressed_with_comments = use_compressed_format && (AbstractDisassembler::show_comment() ||
2889 AbstractDisassembler::show_block_comment());
2890 #endif
2891
2892 // Decoding an nmethod can write to a PcDescCache (see PcDescCache::add_pc_desc)
2893 MACOS_AARCH64_ONLY(ThreadWXEnable wx(WXWrite, Thread::current());)
2894
2895 st->cr();
2896 this->print(st);
2897 st->cr();
2898
2899 #if defined(SUPPORT_ASSEMBLY)
2900 //----------------------------------
2901 //---< Print real disassembly >---
2902 //----------------------------------
2903 if (! use_compressed_format) {
2904 st->print_cr("[Disassembly]");
2905 Disassembler::decode(const_cast<nmethod*>(this), st);
2906 st->bol();
2907 st->print_cr("[/Disassembly]");
2908 return;
2909 }
2910 #endif
2911
2912 #if defined(SUPPORT_ABSTRACT_ASSEMBLY)
2913
2914 // Compressed undisassembled disassembly format.
2915 // The following stati are defined/supported:
2916 // = 0 - currently at bol() position, nothing printed yet on current line.
2917 // = 1 - currently at position after print_location().
2918 // > 1 - in the midst of printing instruction stream bytes.
2919 int compressed_format_idx = 0;
2920 int code_comment_column = 0;
2921 const int instr_maxlen = Assembler::instr_maxlen();
2922 const uint tabspacing = 8;
2923 unsigned char* start = this->code_begin();
2924 unsigned char* p = this->code_begin();
2925 unsigned char* end = this->code_end();
2926 unsigned char* pss = p; // start of a code section (used for offsets)
2927
2928 if ((start == NULL) || (end == NULL)) {
2929 st->print_cr("PrintAssembly not possible due to uninitialized section pointers");
2930 return;
2931 }
2932 #endif
2933
2934 #if defined(SUPPORT_ABSTRACT_ASSEMBLY)
2935 //---< plain abstract disassembly, no comments or anything, just section headers >---
2936 if (use_compressed_format && ! compressed_with_comments) {
2937 const_cast<nmethod*>(this)->print_constant_pool(st);
2938
2939 //---< Open the output (Marker for post-mortem disassembler) >---
2940 st->print_cr("[MachCode]");
2941 const char* header = NULL;
2942 address p0 = p;
2943 while (p < end) {
2944 address pp = p;
2945 while ((p < end) && (header == NULL)) {
2946 header = nmethod_section_label(p);
2947 pp = p;
2948 p += Assembler::instr_len(p);
2949 }
2950 if (pp > p0) {
2951 AbstractDisassembler::decode_range_abstract(p0, pp, start, end, st, Assembler::instr_maxlen());
2952 p0 = pp;
2953 p = pp;
2954 header = NULL;
2955 } else if (header != NULL) {
2956 st->bol();
2957 st->print_cr("%s", header);
2958 header = NULL;
2959 }
2960 }
2961 //---< Close the output (Marker for post-mortem disassembler) >---
2962 st->bol();
2963 st->print_cr("[/MachCode]");
2964 return;
2965 }
2966 #endif
2967
2968 #if defined(SUPPORT_ABSTRACT_ASSEMBLY)
2969 //---< abstract disassembly with comments and section headers merged in >---
2970 if (compressed_with_comments) {
2971 const_cast<nmethod*>(this)->print_constant_pool(st);
2972
2973 //---< Open the output (Marker for post-mortem disassembler) >---
2974 st->print_cr("[MachCode]");
2975 while ((p < end) && (p != NULL)) {
2976 const int instruction_size_in_bytes = Assembler::instr_len(p);
2977
2978 //---< Block comments for nmethod. Interrupts instruction stream, if any. >---
2979 // Outputs a bol() before and a cr() after, but only if a comment is printed.
2980 // Prints nmethod_section_label as well.
2981 if (AbstractDisassembler::show_block_comment()) {
2982 print_block_comment(st, p);
2983 if (st->position() == 0) {
2984 compressed_format_idx = 0;
2985 }
2986 }
2987
2988 //---< New location information after line break >---
2989 if (compressed_format_idx == 0) {
2990 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false);
2991 compressed_format_idx = 1;
2992 }
2993
2994 //---< Code comment for current instruction. Address range [p..(p+len)) >---
2995 unsigned char* p_end = p + (ssize_t)instruction_size_in_bytes;
2996 S390_ONLY(if (p_end > end) p_end = end;) // avoid getting past the end
2997
2998 if (AbstractDisassembler::show_comment() && const_cast<nmethod*>(this)->has_code_comment(p, p_end)) {
2999 //---< interrupt instruction byte stream for code comment >---
3000 if (compressed_format_idx > 1) {
3001 st->cr(); // interrupt byte stream
3002 st->cr(); // add an empty line
3003 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false);
3004 }
3005 const_cast<nmethod*>(this)->print_code_comment_on(st, code_comment_column, p, p_end );
3006 st->bol();
3007 compressed_format_idx = 0;
3008 }
3009
3010 //---< New location information after line break >---
3011 if (compressed_format_idx == 0) {
3012 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false);
3013 compressed_format_idx = 1;
3014 }
3015
3016 //---< Nicely align instructions for readability >---
3017 if (compressed_format_idx > 1) {
3018 Disassembler::print_delimiter(st);
3019 }
3020
3021 //---< Now, finally, print the actual instruction bytes >---
3022 unsigned char* p0 = p;
3023 p = Disassembler::decode_instruction_abstract(p, st, instruction_size_in_bytes, instr_maxlen);
3024 compressed_format_idx += p - p0;
3025
3026 if (Disassembler::start_newline(compressed_format_idx-1)) {
3027 st->cr();
3028 compressed_format_idx = 0;
3029 }
3030 }
3031 //---< Close the output (Marker for post-mortem disassembler) >---
3032 st->bol();
3033 st->print_cr("[/MachCode]");
3034 return;
3035 }
3036 #endif
3037 }
3038
3039 #if defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_ABSTRACT_ASSEMBLY)
3040
3041 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
3042 RelocIterator iter(this, begin, end);
3043 bool have_one = false;
3044 while (iter.next()) {
3045 have_one = true;
3046 switch (iter.type()) {
3047 case relocInfo::none: return "no_reloc";
3048 case relocInfo::oop_type: {
3049 // Get a non-resizable resource-allocated stringStream.
3050 // Our callees make use of (nested) ResourceMarks.
3051 stringStream st(NEW_RESOURCE_ARRAY(char, 1024), 1024);
3052 oop_Relocation* r = iter.oop_reloc();
3053 oop obj = r->oop_value();
3054 st.print("oop(");
3055 if (obj == NULL) st.print("NULL");
3056 else obj->print_value_on(&st);
3057 st.print(")");
3058 return st.as_string();
3059 }
3060 case relocInfo::metadata_type: {
3061 stringStream st;
3062 metadata_Relocation* r = iter.metadata_reloc();
3063 Metadata* obj = r->metadata_value();
3064 st.print("metadata(");
3065 if (obj == NULL) st.print("NULL");
3066 else obj->print_value_on(&st);
3067 st.print(")");
3068 return st.as_string();
3069 }
3070 case relocInfo::runtime_call_type:
3071 case relocInfo::runtime_call_w_cp_type: {
3072 stringStream st;
3073 st.print("runtime_call");
3074 CallRelocation* r = (CallRelocation*)iter.reloc();
3075 address dest = r->destination();
3076 CodeBlob* cb = CodeCache::find_blob(dest);
3077 if (cb != NULL) {
3078 st.print(" %s", cb->name());
3079 } else {
3080 ResourceMark rm;
3081 const int buflen = 1024;
3082 char* buf = NEW_RESOURCE_ARRAY(char, buflen);
3083 int offset;
3084 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) {
3085 st.print(" %s", buf);
3086 if (offset != 0) {
3087 st.print("+%d", offset);
3088 }
3089 }
3090 }
3091 return st.as_string();
3092 }
3093 case relocInfo::virtual_call_type: {
3094 stringStream st;
3095 st.print_raw("virtual_call");
3096 virtual_call_Relocation* r = iter.virtual_call_reloc();
3097 Method* m = r->method_value();
3098 if (m != NULL) {
3099 assert(m->is_method(), "");
3100 m->print_short_name(&st);
3101 }
3102 return st.as_string();
3103 }
3104 case relocInfo::opt_virtual_call_type: {
3105 stringStream st;
3106 st.print_raw("optimized virtual_call");
3107 opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc();
3108 Method* m = r->method_value();
3109 if (m != NULL) {
3110 assert(m->is_method(), "");
3111 m->print_short_name(&st);
3112 }
3113 return st.as_string();
3114 }
3115 case relocInfo::static_call_type: {
3116 stringStream st;
3117 st.print_raw("static_call");
3118 static_call_Relocation* r = iter.static_call_reloc();
3119 Method* m = r->method_value();
3120 if (m != NULL) {
3121 assert(m->is_method(), "");
3122 m->print_short_name(&st);
3123 }
3124 return st.as_string();
3125 }
3126 case relocInfo::static_stub_type: return "static_stub";
3127 case relocInfo::external_word_type: return "external_word";
3128 case relocInfo::internal_word_type: return "internal_word";
3129 case relocInfo::section_word_type: return "section_word";
3130 case relocInfo::poll_type: return "poll";
3131 case relocInfo::poll_return_type: return "poll_return";
3132 case relocInfo::trampoline_stub_type: return "trampoline_stub";
3133 case relocInfo::type_mask: return "type_bit_mask";
3134
3135 default:
3136 break;
3137 }
3138 }
3139 return have_one ? "other" : NULL;
3140 }
3141
3142 // Return a the last scope in (begin..end]
3143 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
3144 PcDesc* p = pc_desc_near(begin+1);
3145 if (p != NULL && p->real_pc(this) <= end) {
3146 return new ScopeDesc(this, p);
3147 }
3148 return NULL;
3149 }
3150
3151 const char* nmethod::nmethod_section_label(address pos) const {
3152 const char* label = NULL;
3153 if (pos == code_begin()) label = "[Instructions begin]";
3154 if (pos == entry_point()) label = "[Entry Point]";
3155 if (pos == inline_entry_point()) label = "[Inline Entry Point]";
3156 if (pos == verified_entry_point()) label = "[Verified Entry Point]";
3157 if (pos == verified_inline_entry_point()) label = "[Verified Inline Entry Point]";
3158 if (pos == verified_inline_ro_entry_point()) label = "[Verified Inline Entry Point (RO)]";
3159 if (has_method_handle_invokes() && (pos == deopt_mh_handler_begin())) label = "[Deopt MH Handler Code]";
3160 if (pos == consts_begin() && pos != insts_begin()) label = "[Constants]";
3161 // Check stub_code before checking exception_handler or deopt_handler.
3162 if (pos == this->stub_begin()) label = "[Stub Code]";
3163 if (JVMCI_ONLY(_exception_offset >= 0 &&) pos == exception_begin()) label = "[Exception Handler]";
3164 if (JVMCI_ONLY(_deopt_handler_begin != NULL &&) pos == deopt_handler_begin()) label = "[Deopt Handler Code]";
3165 return label;
3166 }
3167
3168 static int maybe_print_entry_label(outputStream* stream, address pos, address entry, const char* label) {
3169 if (pos == entry) {
3170 stream->bol();
3171 stream->print_cr("%s", label);
3172 return 1;
3173 } else {
3174 return 0;
3175 }
3176 }
3177
3178 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin, bool print_section_labels) const {
3179 if (print_section_labels) {
3180 int n = 0;
3181 // Multiple entry points may be at the same position. Print them all.
3182 n += maybe_print_entry_label(stream, block_begin, entry_point(), "[Entry Point]");
3183 n += maybe_print_entry_label(stream, block_begin, inline_entry_point(), "[Inline Entry Point]");
3184 n += maybe_print_entry_label(stream, block_begin, verified_entry_point(), "[Verified Entry Point]");
3185 n += maybe_print_entry_label(stream, block_begin, verified_inline_entry_point(), "[Verified Inline Entry Point]");
3186 n += maybe_print_entry_label(stream, block_begin, verified_inline_ro_entry_point(), "[Verified Inline Entry Point (RO)]");
3187 if (n == 0) {
3188 const char* label = nmethod_section_label(block_begin);
3189 if (label != NULL) {
3190 stream->bol();
3191 stream->print_cr("%s", label);
3192 }
3193 }
3194 }
3195
3196 Method* m = method();
3197 if (m == NULL || is_osr_method()) {
3198 return;
3199 }
3200
3201 // Print the name of the method (only once)
3202 address low = MIN4(entry_point(), verified_entry_point(), verified_inline_entry_point(), verified_inline_ro_entry_point());
3203 low = MIN2(low, inline_entry_point());
3204 assert(low != 0, "sanity");
3205 if (block_begin == low) {
3206 stream->print(" # ");
3207 m->print_value_on(stream);
3208 stream->cr();
3209 }
3210
3211 // Print the arguments for the 3 types of verified entry points
3212 CompiledEntrySignature ces(m);
3213 ces.compute_calling_conventions();
3214 const GrowableArray<SigEntry>* sig_cc;
3215 const VMRegPair* regs;
3216 if (block_begin == verified_entry_point()) {
3217 sig_cc = &ces.sig_cc();
3218 regs = ces.regs_cc();
3219 } else if (block_begin == verified_inline_entry_point()) {
3220 sig_cc = &ces.sig();
3221 regs = ces.regs();
3222 } else if (block_begin == verified_inline_ro_entry_point()) {
3223 sig_cc = &ces.sig_cc_ro();
3224 regs = ces.regs_cc_ro();
3225 } else {
3226 return;
3227 }
3228
3229 bool has_this = !m->is_static();
3230 if (ces.has_inline_recv() && block_begin == verified_entry_point()) {
3231 // <this> argument is scalarized for verified_entry_point()
3232 has_this = false;
3233 }
3234 const char* spname = "sp"; // make arch-specific?
3235 int stack_slot_offset = this->frame_size() * wordSize;
3236 int tab1 = 14, tab2 = 24;
3237 int sig_index = 0;
3238 int arg_index = has_this ? -1 : 0;
3239 bool did_old_sp = false;
3240 for (ExtendedSignature sig = ExtendedSignature(sig_cc, SigEntryFilter()); !sig.at_end(); ++sig) {
3241 bool at_this = (arg_index == -1);
3242 bool at_old_sp = false;
3243 BasicType t = (*sig)._bt;
3244 if (at_this) {
3245 stream->print(" # this: ");
3246 } else {
3247 stream->print(" # parm%d: ", arg_index);
3248 }
3249 stream->move_to(tab1);
3250 VMReg fst = regs[sig_index].first();
3251 VMReg snd = regs[sig_index].second();
3252 if (fst->is_reg()) {
3253 stream->print("%s", fst->name());
3254 if (snd->is_valid()) {
3255 stream->print(":%s", snd->name());
3256 }
3257 } else if (fst->is_stack()) {
3258 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
3259 if (offset == stack_slot_offset) at_old_sp = true;
3260 stream->print("[%s+0x%x]", spname, offset);
3261 } else {
3262 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
3263 }
3264 stream->print(" ");
3265 stream->move_to(tab2);
3266 stream->print("= ");
3267 if (at_this) {
3268 m->method_holder()->print_value_on(stream);
3269 } else {
3270 bool did_name = false;
3271 if (is_reference_type(t)) {
3272 Symbol* name = (*sig)._symbol;
3273 name->print_value_on(stream);
3274 did_name = true;
3275 }
3276 if (!did_name)
3277 stream->print("%s", type2name(t));
3278 }
3279 if (at_old_sp) {
3280 stream->print(" (%s of caller)", spname);
3281 did_old_sp = true;
3282 }
3283 stream->cr();
3284 sig_index += type2size[t];
3285 arg_index += 1;
3286 }
3287 if (!did_old_sp) {
3288 stream->print(" # ");
3289 stream->move_to(tab1);
3290 stream->print("[%s+0x%x]", spname, stack_slot_offset);
3291 stream->print(" (%s of caller)", spname);
3292 stream->cr();
3293 }
3294 }
3295
3296 // Returns whether this nmethod has code comments.
3297 bool nmethod::has_code_comment(address begin, address end) {
3298 // scopes?
3299 ScopeDesc* sd = scope_desc_in(begin, end);
3300 if (sd != NULL) return true;
3301
3302 // relocations?
3303 const char* str = reloc_string_for(begin, end);
3304 if (str != NULL) return true;
3305
3306 // implicit exceptions?
3307 int cont_offset = ImplicitExceptionTable(this).continuation_offset(begin - code_begin());
3308 if (cont_offset != 0) return true;
3309
3310 return false;
3311 }
3312
3313 void nmethod::print_code_comment_on(outputStream* st, int column, address begin, address end) {
3314 ImplicitExceptionTable implicit_table(this);
3315 int pc_offset = begin - code_begin();
3316 int cont_offset = implicit_table.continuation_offset(pc_offset);
3317 bool oop_map_required = false;
3318 if (cont_offset != 0) {
3319 st->move_to(column, 6, 0);
3320 if (pc_offset == cont_offset) {
3321 st->print("; implicit exception: deoptimizes");
3322 oop_map_required = true;
3323 } else {
3324 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset));
3325 }
3326 }
3327
3328 // Find an oopmap in (begin, end]. We use the odd half-closed
3329 // interval so that oop maps and scope descs which are tied to the
3330 // byte after a call are printed with the call itself. OopMaps
3331 // associated with implicit exceptions are printed with the implicit
3332 // instruction.
3333 address base = code_begin();
3334 ImmutableOopMapSet* oms = oop_maps();
3335 if (oms != NULL) {
3336 for (int i = 0, imax = oms->count(); i < imax; i++) {
3337 const ImmutableOopMapPair* pair = oms->pair_at(i);
3338 const ImmutableOopMap* om = pair->get_from(oms);
3339 address pc = base + pair->pc_offset();
3340 if (pc >= begin) {
3341 #if INCLUDE_JVMCI
3342 bool is_implicit_deopt = implicit_table.continuation_offset(pair->pc_offset()) == (uint) pair->pc_offset();
3343 #else
3344 bool is_implicit_deopt = false;
3345 #endif
3346 if (is_implicit_deopt ? pc == begin : pc > begin && pc <= end) {
3347 st->move_to(column, 6, 0);
3348 st->print("; ");
3349 om->print_on(st);
3350 oop_map_required = false;
3351 }
3352 }
3353 if (pc > end) {
3354 break;
3355 }
3356 }
3357 }
3358 assert(!oop_map_required, "missed oopmap");
3359
3360 Thread* thread = Thread::current();
3361
3362 // Print any debug info present at this pc.
3363 ScopeDesc* sd = scope_desc_in(begin, end);
3364 if (sd != NULL) {
3365 st->move_to(column, 6, 0);
3366 if (sd->bci() == SynchronizationEntryBCI) {
3367 st->print(";*synchronization entry");
3368 } else if (sd->bci() == AfterBci) {
3369 st->print(";* method exit (unlocked if synchronized)");
3370 } else if (sd->bci() == UnwindBci) {
3371 st->print(";* unwind (locked if synchronized)");
3372 } else if (sd->bci() == AfterExceptionBci) {
3373 st->print(";* unwind (unlocked if synchronized)");
3374 } else if (sd->bci() == UnknownBci) {
3375 st->print(";* unknown");
3376 } else if (sd->bci() == InvalidFrameStateBci) {
3377 st->print(";* invalid frame state");
3378 } else {
3379 if (sd->method() == NULL) {
3380 st->print("method is NULL");
3381 } else if (sd->method()->is_native()) {
3382 st->print("method is native");
3383 } else {
3384 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci());
3385 st->print(";*%s", Bytecodes::name(bc));
3386 switch (bc) {
3387 case Bytecodes::_invokevirtual:
3388 case Bytecodes::_invokespecial:
3389 case Bytecodes::_invokestatic:
3390 case Bytecodes::_invokeinterface:
3391 {
3392 Bytecode_invoke invoke(methodHandle(thread, sd->method()), sd->bci());
3393 st->print(" ");
3394 if (invoke.name() != NULL)
3395 invoke.name()->print_symbol_on(st);
3396 else
3397 st->print("<UNKNOWN>");
3398 break;
3399 }
3400 case Bytecodes::_getfield:
3401 case Bytecodes::_putfield:
3402 case Bytecodes::_getstatic:
3403 case Bytecodes::_putstatic:
3404 {
3405 Bytecode_field field(methodHandle(thread, sd->method()), sd->bci());
3406 st->print(" ");
3407 if (field.name() != NULL)
3408 field.name()->print_symbol_on(st);
3409 else
3410 st->print("<UNKNOWN>");
3411 }
3412 default:
3413 break;
3414 }
3415 }
3416 st->print(" {reexecute=%d rethrow=%d return_oop=%d return_scalarized=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop(), sd->return_scalarized());
3417 }
3418
3419 // Print all scopes
3420 for (;sd != NULL; sd = sd->sender()) {
3421 st->move_to(column, 6, 0);
3422 st->print("; -");
3423 if (sd->should_reexecute()) {
3424 st->print(" (reexecute)");
3425 }
3426 if (sd->method() == NULL) {
3427 st->print("method is NULL");
3428 } else {
3429 sd->method()->print_short_name(st);
3430 }
3431 int lineno = sd->method()->line_number_from_bci(sd->bci());
3432 if (lineno != -1) {
3433 st->print("@%d (line %d)", sd->bci(), lineno);
3434 } else {
3435 st->print("@%d", sd->bci());
3436 }
3437 st->cr();
3438 }
3439 }
3440
3441 // Print relocation information
3442 // Prevent memory leak: allocating without ResourceMark.
3443 ResourceMark rm;
3444 const char* str = reloc_string_for(begin, end);
3445 if (str != NULL) {
3446 if (sd != NULL) st->cr();
3447 st->move_to(column, 6, 0);
3448 st->print("; {%s}", str);
3449 }
3450 }
3451
3452 #endif
3453
3454 class DirectNativeCallWrapper: public NativeCallWrapper {
3455 private:
3456 NativeCall* _call;
3457
3458 public:
3459 DirectNativeCallWrapper(NativeCall* call) : _call(call) {}
3460
3461 virtual address destination() const { return _call->destination(); }
3462 virtual address instruction_address() const { return _call->instruction_address(); }
3463 virtual address next_instruction_address() const { return _call->next_instruction_address(); }
3464 virtual address return_address() const { return _call->return_address(); }
3465
3466 virtual address get_resolve_call_stub(bool is_optimized) const {
3467 if (is_optimized) {
3468 return SharedRuntime::get_resolve_opt_virtual_call_stub();
3469 }
3470 return SharedRuntime::get_resolve_virtual_call_stub();
3471 }
3472
3473 virtual void set_destination_mt_safe(address dest) {
3474 _call->set_destination_mt_safe(dest);
3475 }
3476
3477 virtual void set_to_interpreted(const methodHandle& method, CompiledICInfo& info) {
3478 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address());
3479 {
3480 csc->set_to_interpreted(method, info.entry());
3481 }
3482 }
3483
3484 virtual void verify() const {
3485 // make sure code pattern is actually a call imm32 instruction
3486 _call->verify();
3487 _call->verify_alignment();
3488 }
3489
3490 virtual void verify_resolve_call(address dest) const {
3491 CodeBlob* db = CodeCache::find_blob_unsafe(dest);
3492 assert(db != NULL && !db->is_adapter_blob(), "must use stub!");
3493 }
3494
3495 virtual bool is_call_to_interpreted(address dest) const {
3496 CodeBlob* cb = CodeCache::find_blob(_call->instruction_address());
3497 return cb->contains(dest);
3498 }
3499
3500 virtual bool is_safe_for_patching() const { return false; }
3501
3502 virtual NativeInstruction* get_load_instruction(virtual_call_Relocation* r) const {
3503 return nativeMovConstReg_at(r->cached_value());
3504 }
3505
3506 virtual void *get_data(NativeInstruction* instruction) const {
3507 return (void*)((NativeMovConstReg*) instruction)->data();
3508 }
3509
3510 virtual void set_data(NativeInstruction* instruction, intptr_t data) {
3511 ((NativeMovConstReg*) instruction)->set_data(data);
3512 }
3513 };
3514
3515 NativeCallWrapper* nmethod::call_wrapper_at(address call) const {
3516 return new DirectNativeCallWrapper((NativeCall*) call);
3517 }
3518
3519 NativeCallWrapper* nmethod::call_wrapper_before(address return_pc) const {
3520 return new DirectNativeCallWrapper(nativeCall_before(return_pc));
3521 }
3522
3523 address nmethod::call_instruction_address(address pc) const {
3524 if (NativeCall::is_call_before(pc)) {
3525 NativeCall *ncall = nativeCall_before(pc);
3526 return ncall->instruction_address();
3527 }
3528 return NULL;
3529 }
3530
3531 CompiledStaticCall* nmethod::compiledStaticCall_at(Relocation* call_site) const {
3532 return CompiledDirectStaticCall::at(call_site);
3533 }
3534
3535 CompiledStaticCall* nmethod::compiledStaticCall_at(address call_site) const {
3536 return CompiledDirectStaticCall::at(call_site);
3537 }
3538
3539 CompiledStaticCall* nmethod::compiledStaticCall_before(address return_addr) const {
3540 return CompiledDirectStaticCall::before(return_addr);
3541 }
3542
3543 #if defined(SUPPORT_DATA_STRUCTS)
3544 void nmethod::print_value_on(outputStream* st) const {
3545 st->print("nmethod");
3546 print_on(st, NULL);
3547 }
3548 #endif
3549
3550 #ifndef PRODUCT
3551
3552 void nmethod::print_calls(outputStream* st) {
3553 RelocIterator iter(this);
3554 while (iter.next()) {
3555 switch (iter.type()) {
3556 case relocInfo::virtual_call_type:
3557 case relocInfo::opt_virtual_call_type: {
3558 CompiledICLocker ml_verify(this);
3559 CompiledIC_at(&iter)->print();
3560 break;
3561 }
3562 case relocInfo::static_call_type:
3563 st->print_cr("Static call at " INTPTR_FORMAT, p2i(iter.reloc()->addr()));
3564 CompiledDirectStaticCall::at(iter.reloc())->print();
3565 break;
3566 default:
3567 break;
3568 }
3569 }
3570 }
3571
3572 void nmethod::print_statistics() {
3573 ttyLocker ttyl;
3574 if (xtty != NULL) xtty->head("statistics type='nmethod'");
3575 native_nmethod_stats.print_native_nmethod_stats();
3576 #ifdef COMPILER1
3577 c1_java_nmethod_stats.print_nmethod_stats("C1");
3578 #endif
3579 #ifdef COMPILER2
3580 c2_java_nmethod_stats.print_nmethod_stats("C2");
3581 #endif
3582 #if INCLUDE_JVMCI
3583 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI");
3584 #endif
3585 unknown_java_nmethod_stats.print_nmethod_stats("Unknown");
3586 DebugInformationRecorder::print_statistics();
3587 #ifndef PRODUCT
3588 pc_nmethod_stats.print_pc_stats();
3589 #endif
3590 Dependencies::print_statistics();
3591 if (xtty != NULL) xtty->tail("statistics");
3592 }
3593
3594 #endif // !PRODUCT
3595
3596 #if INCLUDE_JVMCI
3597 void nmethod::update_speculation(JavaThread* thread) {
3598 jlong speculation = thread->pending_failed_speculation();
3599 if (speculation != 0) {
3600 guarantee(jvmci_nmethod_data() != NULL, "failed speculation in nmethod without failed speculation list");
3601 jvmci_nmethod_data()->add_failed_speculation(this, speculation);
3602 thread->set_pending_failed_speculation(0);
3603 }
3604 }
3605
3606 const char* nmethod::jvmci_name() {
3607 if (jvmci_nmethod_data() != NULL) {
3608 return jvmci_nmethod_data()->name();
3609 }
3610 return NULL;
3611 }
3612 #endif