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