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