1 /*
2 * Copyright (c) 1997, 2023, 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 _is_unlinked(false),
644 _native_receiver_sp_offset(basic_lock_owner_sp_offset),
645 _native_basic_lock_sp_offset(basic_lock_sp_offset),
646 _is_unloading_state(0)
647 {
648 {
649 int scopes_data_offset = 0;
650 int deoptimize_offset = 0;
651 int deoptimize_mh_offset = 0;
652
653 debug_only(NoSafepointVerifier nsv;)
654 assert_locked_or_safepoint(CodeCache_lock);
655
656 init_defaults();
657 _comp_level = CompLevel_none;
658 _entry_bci = InvocationEntryBci;
659 // We have no exception handler or deopt handler make the
660 // values something that will never match a pc like the nmethod vtable entry
661 _exception_offset = 0;
662 _orig_pc_offset = 0;
663 _gc_epoch = CodeCache::gc_epoch();
664
665 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts());
666 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs());
667 _oops_offset = data_offset();
668 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize);
669 scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize);
670 _scopes_pcs_offset = scopes_data_offset;
671 _dependencies_offset = _scopes_pcs_offset;
672 _handler_table_offset = _dependencies_offset;
673 _nul_chk_table_offset = _handler_table_offset;
674 _skipped_instructions_size = code_buffer->total_skipped_instructions_size();
675 #if INCLUDE_JVMCI
676 _speculations_offset = _nul_chk_table_offset;
677 _jvmci_data_offset = _speculations_offset;
678 _nmethod_end_offset = _jvmci_data_offset;
679 #else
680 _nmethod_end_offset = _nul_chk_table_offset;
681 #endif
682 _compile_id = compile_id;
683 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
684 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
685 _osr_entry_point = nullptr;
686 _exception_cache = nullptr;
687 _pc_desc_container.reset_to(nullptr);
688
689 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions);
690
691 _scopes_data_begin = (address) this + scopes_data_offset;
692 _deopt_handler_begin = (address) this + deoptimize_offset;
693 _deopt_mh_handler_begin = (address) this + deoptimize_mh_offset;
694
695 code_buffer->copy_code_and_locs_to(this);
696 code_buffer->copy_values_to(this);
697
698 clear_unloading_state();
699
700 Universe::heap()->register_nmethod(this);
701 debug_only(Universe::heap()->verify_nmethod(this));
702
703 CodeCache::commit(this);
704
705 finalize_relocations();
706 }
707
708 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
709 ttyLocker ttyl; // keep the following output all in one block
710 // This output goes directly to the tty, not the compiler log.
711 // To enable tools to match it up with the compilation activity,
712 // be sure to tag this tty output with the compile ID.
713 if (xtty != nullptr) {
714 xtty->begin_head("print_native_nmethod");
715 xtty->method(_method);
716 xtty->stamp();
717 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
718 }
719 // Print the header part, then print the requested information.
720 // This is both handled in decode2(), called via print_code() -> decode()
721 if (PrintNativeNMethods) {
722 tty->print_cr("-------------------------- Assembly (native nmethod) ---------------------------");
723 print_code();
724 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
725 #if defined(SUPPORT_DATA_STRUCTS)
726 if (AbstractDisassembler::show_structs()) {
727 if (oop_maps != nullptr) {
728 tty->print("oop maps:"); // oop_maps->print_on(tty) outputs a cr() at the beginning
729 oop_maps->print_on(tty);
730 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
731 }
732 }
733 #endif
734 } else {
735 print(); // print the header part only.
736 }
737 #if defined(SUPPORT_DATA_STRUCTS)
738 if (AbstractDisassembler::show_structs()) {
739 if (PrintRelocations) {
740 print_relocations();
741 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
742 }
743 }
744 #endif
745 if (xtty != nullptr) {
746 xtty->tail("print_native_nmethod");
747 }
748 }
749 }
750
751 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () {
752 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level));
753 }
754
755 void* nmethod::operator new(size_t size, int nmethod_size, bool allow_NonNMethod_space) throw () {
756 // Try MethodNonProfiled and MethodProfiled.
757 void* return_value = CodeCache::allocate(nmethod_size, CodeBlobType::MethodNonProfiled);
758 if (return_value != nullptr || !allow_NonNMethod_space) return return_value;
759 // Try NonNMethod or give up.
760 return CodeCache::allocate(nmethod_size, CodeBlobType::NonNMethod);
761 }
762
763 nmethod::nmethod(
764 Method* method,
765 CompilerType type,
766 int nmethod_size,
767 int compile_id,
768 int entry_bci,
769 CodeOffsets* offsets,
770 int orig_pc_offset,
771 DebugInformationRecorder* debug_info,
772 Dependencies* dependencies,
773 CodeBuffer *code_buffer,
774 int frame_size,
775 OopMapSet* oop_maps,
776 ExceptionHandlerTable* handler_table,
777 ImplicitExceptionTable* nul_chk_table,
778 AbstractCompiler* compiler,
779 CompLevel comp_level
780 #if INCLUDE_JVMCI
781 , char* speculations,
782 int speculations_len,
783 JVMCINMethodData* jvmci_data
784 #endif
785 )
786 : CompiledMethod(method, "nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false, true),
787 _is_unlinked(false),
788 _native_receiver_sp_offset(in_ByteSize(-1)),
789 _native_basic_lock_sp_offset(in_ByteSize(-1)),
790 _is_unloading_state(0)
791 {
792 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
793 {
794 debug_only(NoSafepointVerifier nsv;)
795 assert_locked_or_safepoint(CodeCache_lock);
796
797 _deopt_handler_begin = (address) this;
798 _deopt_mh_handler_begin = (address) this;
799
800 init_defaults();
801 _entry_bci = entry_bci;
802 _compile_id = compile_id;
803 _comp_level = comp_level;
804 _orig_pc_offset = orig_pc_offset;
805 _gc_epoch = CodeCache::gc_epoch();
806
807 // Section offsets
808 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts());
809 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs());
810 set_ctable_begin(header_begin() + _consts_offset);
811 _skipped_instructions_size = code_buffer->total_skipped_instructions_size();
812
813 #if INCLUDE_JVMCI
814 if (compiler->is_jvmci()) {
815 // JVMCI might not produce any stub sections
816 if (offsets->value(CodeOffsets::Exceptions) != -1) {
817 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions);
818 } else {
819 _exception_offset = -1;
820 }
821 if (offsets->value(CodeOffsets::Deopt) != -1) {
822 _deopt_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::Deopt);
823 } else {
824 _deopt_handler_begin = nullptr;
825 }
826 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
827 _deopt_mh_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::DeoptMH);
828 } else {
829 _deopt_mh_handler_begin = nullptr;
830 }
831 } else
832 #endif
833 {
834 // Exception handler and deopt handler are in the stub section
835 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set");
836 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set");
837
838 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
839 _deopt_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::Deopt);
840 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
841 _deopt_mh_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::DeoptMH);
842 } else {
843 _deopt_mh_handler_begin = nullptr;
844 }
845 }
846 if (offsets->value(CodeOffsets::UnwindHandler) != -1) {
847 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler);
848 } else {
849 _unwind_handler_offset = -1;
850 }
851
852 _oops_offset = data_offset();
853 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize);
854 int scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize);
855
856 _scopes_pcs_offset = scopes_data_offset + align_up(debug_info->data_size (), oopSize);
857 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
858 _handler_table_offset = _dependencies_offset + align_up((int)dependencies->size_in_bytes(), oopSize);
859 _nul_chk_table_offset = _handler_table_offset + align_up(handler_table->size_in_bytes(), oopSize);
860 #if INCLUDE_JVMCI
861 _speculations_offset = _nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize);
862 _jvmci_data_offset = _speculations_offset + align_up(speculations_len, oopSize);
863 int jvmci_data_size = compiler->is_jvmci() ? jvmci_data->size() : 0;
864 _nmethod_end_offset = _jvmci_data_offset + align_up(jvmci_data_size, oopSize);
865 #else
866 _nmethod_end_offset = _nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize);
867 #endif
868 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
869 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
870 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry);
871 _exception_cache = nullptr;
872 _scopes_data_begin = (address) this + scopes_data_offset;
873
874 _pc_desc_container.reset_to(scopes_pcs_begin());
875
876 code_buffer->copy_code_and_locs_to(this);
877 // Copy contents of ScopeDescRecorder to nmethod
878 code_buffer->copy_values_to(this);
879 debug_info->copy_to(this);
880 dependencies->copy_to(this);
881 clear_unloading_state();
882
883 #if INCLUDE_JVMCI
884 if (compiler->is_jvmci()) {
885 // Initialize the JVMCINMethodData object inlined into nm
886 jvmci_nmethod_data()->copy(jvmci_data);
887 }
888 #endif
889
890 Universe::heap()->register_nmethod(this);
891 debug_only(Universe::heap()->verify_nmethod(this));
892
893 CodeCache::commit(this);
894
895 finalize_relocations();
896
897 // Copy contents of ExceptionHandlerTable to nmethod
898 handler_table->copy_to(this);
899 nul_chk_table->copy_to(this);
900
901 #if INCLUDE_JVMCI
902 // Copy speculations to nmethod
903 if (speculations_size() != 0) {
904 memcpy(speculations_begin(), speculations, speculations_len);
905 }
906 #endif
907
908 // we use the information of entry points to find out if a method is
909 // static or non static
910 assert(compiler->is_c2() || compiler->is_jvmci() ||
911 _method->is_static() == (entry_point() == _verified_entry_point),
912 " entry points must be same for static methods and vice versa");
913 }
914 }
915
916 // Print a short set of xml attributes to identify this nmethod. The
917 // output should be embedded in some other element.
918 void nmethod::log_identity(xmlStream* log) const {
919 log->print(" compile_id='%d'", compile_id());
920 const char* nm_kind = compile_kind();
921 if (nm_kind != nullptr) log->print(" compile_kind='%s'", nm_kind);
922 log->print(" compiler='%s'", compiler_name());
923 if (TieredCompilation) {
924 log->print(" level='%d'", comp_level());
925 }
926 #if INCLUDE_JVMCI
927 if (jvmci_nmethod_data() != nullptr) {
928 const char* jvmci_name = jvmci_nmethod_data()->name();
929 if (jvmci_name != nullptr) {
930 log->print(" jvmci_mirror_name='");
931 log->text("%s", jvmci_name);
932 log->print("'");
933 }
934 }
935 #endif
936 }
937
938
939 #define LOG_OFFSET(log, name) \
940 if (p2i(name##_end()) - p2i(name##_begin())) \
941 log->print(" " XSTR(name) "_offset='" INTX_FORMAT "'" , \
942 p2i(name##_begin()) - p2i(this))
943
944
945 void nmethod::log_new_nmethod() const {
946 if (LogCompilation && xtty != nullptr) {
947 ttyLocker ttyl;
948 xtty->begin_elem("nmethod");
949 log_identity(xtty);
950 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size());
951 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this));
952
953 LOG_OFFSET(xtty, relocation);
954 LOG_OFFSET(xtty, consts);
955 LOG_OFFSET(xtty, insts);
956 LOG_OFFSET(xtty, stub);
957 LOG_OFFSET(xtty, scopes_data);
958 LOG_OFFSET(xtty, scopes_pcs);
959 LOG_OFFSET(xtty, dependencies);
960 LOG_OFFSET(xtty, handler_table);
961 LOG_OFFSET(xtty, nul_chk_table);
962 LOG_OFFSET(xtty, oops);
963 LOG_OFFSET(xtty, metadata);
964
965 xtty->method(method());
966 xtty->stamp();
967 xtty->end_elem();
968 }
969 }
970
971 #undef LOG_OFFSET
972
973
974 // Print out more verbose output usually for a newly created nmethod.
975 void nmethod::print_on(outputStream* st, const char* msg) const {
976 if (st != nullptr) {
977 ttyLocker ttyl;
978 if (WizardMode) {
979 CompileTask::print(st, this, msg, /*short_form:*/ true);
980 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this));
981 } else {
982 CompileTask::print(st, this, msg, /*short_form:*/ false);
983 }
984 }
985 }
986
987 void nmethod::maybe_print_nmethod(const DirectiveSet* directive) {
988 bool printnmethods = directive->PrintAssemblyOption || directive->PrintNMethodsOption;
989 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
990 print_nmethod(printnmethods);
991 }
992 }
993
994 void nmethod::print_nmethod(bool printmethod) {
995 ttyLocker ttyl; // keep the following output all in one block
996 if (xtty != nullptr) {
997 xtty->begin_head("print_nmethod");
998 log_identity(xtty);
999 xtty->stamp();
1000 xtty->end_head();
1001 }
1002 // Print the header part, then print the requested information.
1003 // This is both handled in decode2().
1004 if (printmethod) {
1005 ResourceMark m;
1006 if (is_compiled_by_c1()) {
1007 tty->cr();
1008 tty->print_cr("============================= C1-compiled nmethod ==============================");
1009 }
1010 if (is_compiled_by_jvmci()) {
1011 tty->cr();
1012 tty->print_cr("=========================== JVMCI-compiled nmethod =============================");
1013 }
1014 tty->print_cr("----------------------------------- Assembly -----------------------------------");
1015 decode2(tty);
1016 #if defined(SUPPORT_DATA_STRUCTS)
1017 if (AbstractDisassembler::show_structs()) {
1018 // Print the oops from the underlying CodeBlob as well.
1019 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1020 print_oops(tty);
1021 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1022 print_metadata(tty);
1023 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1024 print_pcs();
1025 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1026 if (oop_maps() != nullptr) {
1027 tty->print("oop maps:"); // oop_maps()->print_on(tty) outputs a cr() at the beginning
1028 oop_maps()->print_on(tty);
1029 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1030 }
1031 }
1032 #endif
1033 } else {
1034 print(); // print the header part only.
1035 }
1036
1037 #if defined(SUPPORT_DATA_STRUCTS)
1038 if (AbstractDisassembler::show_structs()) {
1039 methodHandle mh(Thread::current(), _method);
1040 if (printmethod || PrintDebugInfo || CompilerOracle::has_option(mh, CompileCommand::PrintDebugInfo)) {
1041 print_scopes();
1042 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1043 }
1044 if (printmethod || PrintRelocations || CompilerOracle::has_option(mh, CompileCommand::PrintRelocations)) {
1045 print_relocations();
1046 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1047 }
1048 if (printmethod || PrintDependencies || CompilerOracle::has_option(mh, CompileCommand::PrintDependencies)) {
1049 print_dependencies_on(tty);
1050 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1051 }
1052 if (printmethod || PrintExceptionHandlers) {
1053 print_handler_table();
1054 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1055 print_nul_chk_table();
1056 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1057 }
1058
1059 if (printmethod) {
1060 print_recorded_oops();
1061 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1062 print_recorded_metadata();
1063 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1064 }
1065 }
1066 #endif
1067
1068 if (xtty != nullptr) {
1069 xtty->tail("print_nmethod");
1070 }
1071 }
1072
1073
1074 // Promote one word from an assembly-time handle to a live embedded oop.
1075 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
1076 if (handle == nullptr ||
1077 // As a special case, IC oops are initialized to 1 or -1.
1078 handle == (jobject) Universe::non_oop_word()) {
1079 *(void**)dest = handle;
1080 } else {
1081 *dest = JNIHandles::resolve_non_null(handle);
1082 }
1083 }
1084
1085
1086 // Have to have the same name because it's called by a template
1087 void nmethod::copy_values(GrowableArray<jobject>* array) {
1088 int length = array->length();
1089 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
1090 oop* dest = oops_begin();
1091 for (int index = 0 ; index < length; index++) {
1092 initialize_immediate_oop(&dest[index], array->at(index));
1093 }
1094
1095 // Now we can fix up all the oops in the code. We need to do this
1096 // in the code because the assembler uses jobjects as placeholders.
1097 // The code and relocations have already been initialized by the
1098 // CodeBlob constructor, so it is valid even at this early point to
1099 // iterate over relocations and patch the code.
1100 fix_oop_relocations(nullptr, nullptr, /*initialize_immediates=*/ true);
1101 }
1102
1103 void nmethod::copy_values(GrowableArray<Metadata*>* array) {
1104 int length = array->length();
1105 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough");
1106 Metadata** dest = metadata_begin();
1107 for (int index = 0 ; index < length; index++) {
1108 dest[index] = array->at(index);
1109 }
1110 }
1111
1112 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) {
1113 // re-patch all oop-bearing instructions, just in case some oops moved
1114 RelocIterator iter(this, begin, end);
1115 while (iter.next()) {
1116 if (iter.type() == relocInfo::oop_type) {
1117 oop_Relocation* reloc = iter.oop_reloc();
1118 if (initialize_immediates && reloc->oop_is_immediate()) {
1119 oop* dest = reloc->oop_addr();
1120 jobject obj = *reinterpret_cast<jobject*>(dest);
1121 initialize_immediate_oop(dest, obj);
1122 }
1123 // Refresh the oop-related bits of this instruction.
1124 reloc->fix_oop_relocation();
1125 } else if (iter.type() == relocInfo::metadata_type) {
1126 metadata_Relocation* reloc = iter.metadata_reloc();
1127 reloc->fix_metadata_relocation();
1128 }
1129 }
1130 }
1131
1132 static void install_post_call_nop_displacement(nmethod* nm, address pc) {
1133 NativePostCallNop* nop = nativePostCallNop_at((address) pc);
1134 intptr_t cbaddr = (intptr_t) nm;
1135 intptr_t offset = ((intptr_t) pc) - cbaddr;
1136
1137 int oopmap_slot = nm->oop_maps()->find_slot_for_offset(int((intptr_t) pc - (intptr_t) nm->code_begin()));
1138 if (oopmap_slot < 0) { // this can happen at asynchronous (non-safepoint) stackwalks
1139 log_debug(codecache)("failed to find oopmap for cb: " INTPTR_FORMAT " offset: %d", cbaddr, (int) offset);
1140 } else if (((oopmap_slot & 0xff) == oopmap_slot) && ((offset & 0xffffff) == offset)) {
1141 jint value = (oopmap_slot << 24) | (jint) offset;
1142 nop->patch(value);
1143 } else {
1144 log_debug(codecache)("failed to encode %d %d", oopmap_slot, (int) offset);
1145 }
1146 }
1147
1148 void nmethod::finalize_relocations() {
1149 NoSafepointVerifier nsv;
1150
1151 // Make sure that post call nops fill in nmethod offsets eagerly so
1152 // we don't have to race with deoptimization
1153 RelocIterator iter(this);
1154 while (iter.next()) {
1155 if (iter.type() == relocInfo::post_call_nop_type) {
1156 post_call_nop_Relocation* const reloc = iter.post_call_nop_reloc();
1157 address pc = reloc->addr();
1158 install_post_call_nop_displacement(this, pc);
1159 }
1160 }
1161 }
1162
1163 void nmethod::make_deoptimized() {
1164 if (!Continuations::enabled()) {
1165 // Don't deopt this again.
1166 set_deoptimized_done();
1167 return;
1168 }
1169
1170 assert(method() == nullptr || can_be_deoptimized(), "");
1171
1172 CompiledICLocker ml(this);
1173 assert(CompiledICLocker::is_safe(this), "mt unsafe call");
1174
1175 // If post call nops have been already patched, we can just bail-out.
1176 if (has_been_deoptimized()) {
1177 return;
1178 }
1179
1180 ResourceMark rm;
1181 RelocIterator iter(this, oops_reloc_begin());
1182
1183 while (iter.next()) {
1184
1185 switch (iter.type()) {
1186 case relocInfo::virtual_call_type:
1187 case relocInfo::opt_virtual_call_type: {
1188 CompiledIC *ic = CompiledIC_at(&iter);
1189 address pc = ic->end_of_call();
1190 NativePostCallNop* nop = nativePostCallNop_at(pc);
1191 if (nop != nullptr) {
1192 nop->make_deopt();
1193 }
1194 assert(NativeDeoptInstruction::is_deopt_at(pc), "check");
1195 break;
1196 }
1197 case relocInfo::static_call_type: {
1198 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
1199 address pc = csc->end_of_call();
1200 NativePostCallNop* nop = nativePostCallNop_at(pc);
1201 //tty->print_cr(" - static pc %p", pc);
1202 if (nop != nullptr) {
1203 nop->make_deopt();
1204 }
1205 // We can't assert here, there are some calls to stubs / runtime
1206 // that have reloc data and doesn't have a post call NOP.
1207 //assert(NativeDeoptInstruction::is_deopt_at(pc), "check");
1208 break;
1209 }
1210 default:
1211 break;
1212 }
1213 }
1214 // Don't deopt this again.
1215 set_deoptimized_done();
1216 }
1217
1218 void nmethod::verify_clean_inline_caches() {
1219 assert(CompiledICLocker::is_safe(this), "mt unsafe call");
1220
1221 ResourceMark rm;
1222 RelocIterator iter(this, oops_reloc_begin());
1223 while(iter.next()) {
1224 switch(iter.type()) {
1225 case relocInfo::virtual_call_type:
1226 case relocInfo::opt_virtual_call_type: {
1227 CompiledIC *ic = CompiledIC_at(&iter);
1228 CodeBlob *cb = CodeCache::find_blob(ic->ic_destination());
1229 assert(cb != nullptr, "destination not in CodeBlob?");
1230 nmethod* nm = cb->as_nmethod_or_null();
1231 if( nm != nullptr ) {
1232 // Verify that inline caches pointing to bad nmethods are clean
1233 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1234 assert(ic->is_clean(), "IC should be clean");
1235 }
1236 }
1237 break;
1238 }
1239 case relocInfo::static_call_type: {
1240 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
1241 CodeBlob *cb = CodeCache::find_blob(csc->destination());
1242 assert(cb != nullptr, "destination not in CodeBlob?");
1243 nmethod* nm = cb->as_nmethod_or_null();
1244 if( nm != nullptr ) {
1245 // Verify that inline caches pointing to bad nmethods are clean
1246 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1247 assert(csc->is_clean(), "IC should be clean");
1248 }
1249 }
1250 break;
1251 }
1252 default:
1253 break;
1254 }
1255 }
1256 }
1257
1258 void nmethod::mark_as_maybe_on_stack() {
1259 Atomic::store(&_gc_epoch, CodeCache::gc_epoch());
1260 }
1261
1262 bool nmethod::is_maybe_on_stack() {
1263 // If the condition below is true, it means that the nmethod was found to
1264 // be alive the previous completed marking cycle.
1265 return Atomic::load(&_gc_epoch) >= CodeCache::previous_completed_gc_marking_cycle();
1266 }
1267
1268 void nmethod::inc_decompile_count() {
1269 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return;
1270 // Could be gated by ProfileTraps, but do not bother...
1271 Method* m = method();
1272 if (m == nullptr) return;
1273 MethodData* mdo = m->method_data();
1274 if (mdo == nullptr) return;
1275 // There is a benign race here. See comments in methodData.hpp.
1276 mdo->inc_decompile_count();
1277 }
1278
1279 bool nmethod::try_transition(signed char new_state_int) {
1280 signed char new_state = new_state_int;
1281 assert_lock_strong(CompiledMethod_lock);
1282 signed char old_state = _state;
1283 if (old_state >= new_state) {
1284 // Ensure monotonicity of transitions.
1285 return false;
1286 }
1287 Atomic::store(&_state, new_state);
1288 return true;
1289 }
1290
1291 void nmethod::invalidate_osr_method() {
1292 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
1293 // Remove from list of active nmethods
1294 if (method() != nullptr) {
1295 method()->method_holder()->remove_osr_nmethod(this);
1296 }
1297 }
1298
1299 void nmethod::log_state_change() const {
1300 if (LogCompilation) {
1301 if (xtty != nullptr) {
1302 ttyLocker ttyl; // keep the following output all in one block
1303 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'",
1304 os::current_thread_id());
1305 log_identity(xtty);
1306 xtty->stamp();
1307 xtty->end_elem();
1308 }
1309 }
1310
1311 CompileTask::print_ul(this, "made not entrant");
1312 if (PrintCompilation) {
1313 print_on(tty, "made not entrant");
1314 }
1315 }
1316
1317 void nmethod::unlink_from_method() {
1318 if (method() != nullptr) {
1319 method()->unlink_code(this);
1320 }
1321 }
1322
1323 // Invalidate code
1324 bool nmethod::make_not_entrant() {
1325 // This can be called while the system is already at a safepoint which is ok
1326 NoSafepointVerifier nsv;
1327
1328 if (is_unloading()) {
1329 // If the nmethod is unloading, then it is already not entrant through
1330 // the nmethod entry barriers. No need to do anything; GC will unload it.
1331 return false;
1332 }
1333
1334 if (Atomic::load(&_state) == not_entrant) {
1335 // Avoid taking the lock if already in required state.
1336 // This is safe from races because the state is an end-state,
1337 // which the nmethod cannot back out of once entered.
1338 // No need for fencing either.
1339 return false;
1340 }
1341
1342 {
1343 // Enter critical section. Does not block for safepoint.
1344 ConditionalMutexLocker ml(CompiledMethod_lock, !CompiledMethod_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
1345
1346 if (Atomic::load(&_state) == not_entrant) {
1347 // another thread already performed this transition so nothing
1348 // to do, but return false to indicate this.
1349 return false;
1350 }
1351
1352 if (is_osr_method()) {
1353 // This logic is equivalent to the logic below for patching the
1354 // verified entry point of regular methods.
1355 // this effectively makes the osr nmethod not entrant
1356 invalidate_osr_method();
1357 } else {
1358 // The caller can be calling the method statically or through an inline
1359 // cache call.
1360 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
1361 SharedRuntime::get_handle_wrong_method_stub());
1362 }
1363
1364 if (update_recompile_counts()) {
1365 // Mark the method as decompiled.
1366 inc_decompile_count();
1367 }
1368
1369 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
1370 if (bs_nm == nullptr || !bs_nm->supports_entry_barrier(this)) {
1371 // If nmethod entry barriers are not supported, we won't mark
1372 // nmethods as on-stack when they become on-stack. So we
1373 // degrade to a less accurate flushing strategy, for now.
1374 mark_as_maybe_on_stack();
1375 }
1376
1377 // Change state
1378 bool success = try_transition(not_entrant);
1379 assert(success, "Transition can't fail");
1380
1381 // Log the transition once
1382 log_state_change();
1383
1384 // Remove nmethod from method.
1385 unlink_from_method();
1386
1387 } // leave critical region under CompiledMethod_lock
1388
1389 #if INCLUDE_JVMCI
1390 // Invalidate can't occur while holding the Patching lock
1391 JVMCINMethodData* nmethod_data = jvmci_nmethod_data();
1392 if (nmethod_data != nullptr) {
1393 nmethod_data->invalidate_nmethod_mirror(this);
1394 }
1395 #endif
1396
1397 #ifdef ASSERT
1398 if (is_osr_method() && method() != nullptr) {
1399 // Make sure osr nmethod is invalidated, i.e. not on the list
1400 bool found = method()->method_holder()->remove_osr_nmethod(this);
1401 assert(!found, "osr nmethod should have been invalidated");
1402 }
1403 #endif
1404
1405 return true;
1406 }
1407
1408 // For concurrent GCs, there must be a handshake between unlink and flush
1409 void nmethod::unlink() {
1410 if (_is_unlinked) {
1411 // Already unlinked. It can be invoked twice because concurrent code cache
1412 // unloading might need to restart when inline cache cleaning fails due to
1413 // running out of ICStubs, which can only be refilled at safepoints
1414 return;
1415 }
1416
1417 flush_dependencies();
1418
1419 // unlink_from_method will take the CompiledMethod_lock.
1420 // In this case we don't strictly need it when unlinking nmethods from
1421 // the Method, because it is only concurrently unlinked by
1422 // the entry barrier, which acquires the per nmethod lock.
1423 unlink_from_method();
1424 clear_ic_callsites();
1425
1426 if (is_osr_method()) {
1427 invalidate_osr_method();
1428 }
1429
1430 #if INCLUDE_JVMCI
1431 // Clear the link between this nmethod and a HotSpotNmethod mirror
1432 JVMCINMethodData* nmethod_data = jvmci_nmethod_data();
1433 if (nmethod_data != nullptr) {
1434 nmethod_data->invalidate_nmethod_mirror(this);
1435 }
1436 #endif
1437
1438 // Post before flushing as jmethodID is being used
1439 post_compiled_method_unload();
1440
1441 // Register for flushing when it is safe. For concurrent class unloading,
1442 // that would be after the unloading handshake, and for STW class unloading
1443 // that would be when getting back to the VM thread.
1444 ClassUnloadingContext::context()->register_unlinked_nmethod(this);
1445 }
1446
1447 void nmethod::purge(bool free_code_cache_data) {
1448 MutexLocker ml(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1449
1450 // completely deallocate this method
1451 Events::log(Thread::current(), "flushing nmethod " INTPTR_FORMAT, p2i(this));
1452 log_debug(codecache)("*flushing %s nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT
1453 "/Free CodeCache:" SIZE_FORMAT "Kb",
1454 is_osr_method() ? "osr" : "",_compile_id, p2i(this), CodeCache::blob_count(),
1455 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024);
1456
1457 // We need to deallocate any ExceptionCache data.
1458 // Note that we do not need to grab the nmethod lock for this, it
1459 // better be thread safe if we're disposing of it!
1460 ExceptionCache* ec = exception_cache();
1461 while(ec != nullptr) {
1462 ExceptionCache* next = ec->next();
1463 delete ec;
1464 ec = next;
1465 }
1466
1467 Universe::heap()->unregister_nmethod(this);
1468 CodeCache::unregister_old_nmethod(this);
1469
1470 CodeBlob::purge();
1471 if (free_code_cache_data) {
1472 CodeCache::free(this);
1473 }
1474 }
1475
1476 oop nmethod::oop_at(int index) const {
1477 if (index == 0) {
1478 return nullptr;
1479 }
1480 return NMethodAccess<AS_NO_KEEPALIVE>::oop_load(oop_addr_at(index));
1481 }
1482
1483 oop nmethod::oop_at_phantom(int index) const {
1484 if (index == 0) {
1485 return nullptr;
1486 }
1487 return NMethodAccess<ON_PHANTOM_OOP_REF>::oop_load(oop_addr_at(index));
1488 }
1489
1490 //
1491 // Notify all classes this nmethod is dependent on that it is no
1492 // longer dependent.
1493
1494 void nmethod::flush_dependencies() {
1495 if (!has_flushed_dependencies()) {
1496 set_has_flushed_dependencies();
1497 for (Dependencies::DepStream deps(this); deps.next(); ) {
1498 if (deps.type() == Dependencies::call_site_target_value) {
1499 // CallSite dependencies are managed on per-CallSite instance basis.
1500 oop call_site = deps.argument_oop(0);
1501 MethodHandles::clean_dependency_context(call_site);
1502 } else {
1503 InstanceKlass* ik = deps.context_type();
1504 if (ik == nullptr) {
1505 continue; // ignore things like evol_method
1506 }
1507 // During GC liveness of dependee determines class that needs to be updated.
1508 // The GC may clean dependency contexts concurrently and in parallel.
1509 ik->clean_dependency_context();
1510 }
1511 }
1512 }
1513 }
1514
1515 void nmethod::post_compiled_method(CompileTask* task) {
1516 task->mark_success();
1517 task->set_nm_content_size(content_size());
1518 task->set_nm_insts_size(insts_size());
1519 task->set_nm_total_size(total_size());
1520
1521 // JVMTI -- compiled method notification (must be done outside lock)
1522 post_compiled_method_load_event();
1523
1524 if (CompilationLog::log() != nullptr) {
1525 CompilationLog::log()->log_nmethod(JavaThread::current(), this);
1526 }
1527
1528 const DirectiveSet* directive = task->directive();
1529 maybe_print_nmethod(directive);
1530 }
1531
1532 // ------------------------------------------------------------------
1533 // post_compiled_method_load_event
1534 // new method for install_code() path
1535 // Transfer information from compilation to jvmti
1536 void nmethod::post_compiled_method_load_event(JvmtiThreadState* state) {
1537 // This is a bad time for a safepoint. We don't want
1538 // this nmethod to get unloaded while we're queueing the event.
1539 NoSafepointVerifier nsv;
1540
1541 Method* m = method();
1542 HOTSPOT_COMPILED_METHOD_LOAD(
1543 (char *) m->klass_name()->bytes(),
1544 m->klass_name()->utf8_length(),
1545 (char *) m->name()->bytes(),
1546 m->name()->utf8_length(),
1547 (char *) m->signature()->bytes(),
1548 m->signature()->utf8_length(),
1549 insts_begin(), insts_size());
1550
1551
1552 if (JvmtiExport::should_post_compiled_method_load()) {
1553 // Only post unload events if load events are found.
1554 set_load_reported();
1555 // If a JavaThread hasn't been passed in, let the Service thread
1556 // (which is a real Java thread) post the event
1557 JvmtiDeferredEvent event = JvmtiDeferredEvent::compiled_method_load_event(this);
1558 if (state == nullptr) {
1559 // Execute any barrier code for this nmethod as if it's called, since
1560 // keeping it alive looks like stack walking.
1561 run_nmethod_entry_barrier();
1562 ServiceThread::enqueue_deferred_event(&event);
1563 } else {
1564 // This enters the nmethod barrier outside in the caller.
1565 state->enqueue_event(&event);
1566 }
1567 }
1568 }
1569
1570 void nmethod::post_compiled_method_unload() {
1571 assert(_method != nullptr, "just checking");
1572 DTRACE_METHOD_UNLOAD_PROBE(method());
1573
1574 // If a JVMTI agent has enabled the CompiledMethodUnload event then
1575 // post the event. The Method* will not be valid when this is freed.
1576
1577 // Don't bother posting the unload if the load event wasn't posted.
1578 if (load_reported() && JvmtiExport::should_post_compiled_method_unload()) {
1579 JvmtiDeferredEvent event =
1580 JvmtiDeferredEvent::compiled_method_unload_event(
1581 method()->jmethod_id(), insts_begin());
1582 ServiceThread::enqueue_deferred_event(&event);
1583 }
1584 }
1585
1586 // Iterate over metadata calling this function. Used by RedefineClasses
1587 void nmethod::metadata_do(MetadataClosure* f) {
1588 {
1589 // Visit all immediate references that are embedded in the instruction stream.
1590 RelocIterator iter(this, oops_reloc_begin());
1591 while (iter.next()) {
1592 if (iter.type() == relocInfo::metadata_type) {
1593 metadata_Relocation* r = iter.metadata_reloc();
1594 // In this metadata, we must only follow those metadatas directly embedded in
1595 // the code. Other metadatas (oop_index>0) are seen as part of
1596 // the metadata section below.
1597 assert(1 == (r->metadata_is_immediate()) +
1598 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
1599 "metadata must be found in exactly one place");
1600 if (r->metadata_is_immediate() && r->metadata_value() != nullptr) {
1601 Metadata* md = r->metadata_value();
1602 if (md != _method) f->do_metadata(md);
1603 }
1604 } else if (iter.type() == relocInfo::virtual_call_type) {
1605 // Check compiledIC holders associated with this nmethod
1606 ResourceMark rm;
1607 CompiledIC *ic = CompiledIC_at(&iter);
1608 if (ic->is_icholder_call()) {
1609 CompiledICHolder* cichk = ic->cached_icholder();
1610 f->do_metadata(cichk->holder_metadata());
1611 f->do_metadata(cichk->holder_klass());
1612 } else {
1613 Metadata* ic_oop = ic->cached_metadata();
1614 if (ic_oop != nullptr) {
1615 f->do_metadata(ic_oop);
1616 }
1617 }
1618 }
1619 }
1620 }
1621
1622 // Visit the metadata section
1623 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
1624 if (*p == Universe::non_oop_word() || *p == nullptr) continue; // skip non-oops
1625 Metadata* md = *p;
1626 f->do_metadata(md);
1627 }
1628
1629 // Visit metadata not embedded in the other places.
1630 if (_method != nullptr) f->do_metadata(_method);
1631 }
1632
1633 // Heuristic for nuking nmethods even though their oops are live.
1634 // Main purpose is to reduce code cache pressure and get rid of
1635 // nmethods that don't seem to be all that relevant any longer.
1636 bool nmethod::is_cold() {
1637 if (!MethodFlushing || is_native_method() || is_not_installed()) {
1638 // No heuristic unloading at all
1639 return false;
1640 }
1641
1642 if (!is_maybe_on_stack() && is_not_entrant()) {
1643 // Not entrant nmethods that are not on any stack can just
1644 // be removed
1645 return true;
1646 }
1647
1648 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
1649 if (bs_nm == nullptr || !bs_nm->supports_entry_barrier(this)) {
1650 // On platforms that don't support nmethod entry barriers, we can't
1651 // trust the temporal aspect of the gc epochs. So we can't detect
1652 // cold nmethods on such platforms.
1653 return false;
1654 }
1655
1656 if (!UseCodeCacheFlushing) {
1657 // Bail out if we don't heuristically remove nmethods
1658 return false;
1659 }
1660
1661 // Other code can be phased out more gradually after N GCs
1662 return CodeCache::previous_completed_gc_marking_cycle() > _gc_epoch + 2 * CodeCache::cold_gc_count();
1663 }
1664
1665 // The _is_unloading_state encodes a tuple comprising the unloading cycle
1666 // and the result of IsUnloadingBehaviour::is_unloading() for that cycle.
1667 // This is the bit layout of the _is_unloading_state byte: 00000CCU
1668 // CC refers to the cycle, which has 2 bits, and U refers to the result of
1669 // IsUnloadingBehaviour::is_unloading() for that unloading cycle.
1670
1671 class IsUnloadingState: public AllStatic {
1672 static const uint8_t _is_unloading_mask = 1;
1673 static const uint8_t _is_unloading_shift = 0;
1674 static const uint8_t _unloading_cycle_mask = 6;
1675 static const uint8_t _unloading_cycle_shift = 1;
1676
1677 static uint8_t set_is_unloading(uint8_t state, bool value) {
1678 state &= (uint8_t)~_is_unloading_mask;
1679 if (value) {
1680 state |= 1 << _is_unloading_shift;
1681 }
1682 assert(is_unloading(state) == value, "unexpected unloading cycle overflow");
1683 return state;
1684 }
1685
1686 static uint8_t set_unloading_cycle(uint8_t state, uint8_t value) {
1687 state &= (uint8_t)~_unloading_cycle_mask;
1688 state |= (uint8_t)(value << _unloading_cycle_shift);
1689 assert(unloading_cycle(state) == value, "unexpected unloading cycle overflow");
1690 return state;
1691 }
1692
1693 public:
1694 static bool is_unloading(uint8_t state) { return (state & _is_unloading_mask) >> _is_unloading_shift == 1; }
1695 static uint8_t unloading_cycle(uint8_t state) { return (state & _unloading_cycle_mask) >> _unloading_cycle_shift; }
1696
1697 static uint8_t create(bool is_unloading, uint8_t unloading_cycle) {
1698 uint8_t state = 0;
1699 state = set_is_unloading(state, is_unloading);
1700 state = set_unloading_cycle(state, unloading_cycle);
1701 return state;
1702 }
1703 };
1704
1705 bool nmethod::is_unloading() {
1706 uint8_t state = Atomic::load(&_is_unloading_state);
1707 bool state_is_unloading = IsUnloadingState::is_unloading(state);
1708 if (state_is_unloading) {
1709 return true;
1710 }
1711 uint8_t state_unloading_cycle = IsUnloadingState::unloading_cycle(state);
1712 uint8_t current_cycle = CodeCache::unloading_cycle();
1713 if (state_unloading_cycle == current_cycle) {
1714 return false;
1715 }
1716
1717 // The IsUnloadingBehaviour is responsible for calculating if the nmethod
1718 // should be unloaded. This can be either because there is a dead oop,
1719 // or because is_cold() heuristically determines it is time to unload.
1720 state_unloading_cycle = current_cycle;
1721 state_is_unloading = IsUnloadingBehaviour::is_unloading(this);
1722 uint8_t new_state = IsUnloadingState::create(state_is_unloading, state_unloading_cycle);
1723
1724 // Note that if an nmethod has dead oops, everyone will agree that the
1725 // nmethod is_unloading. However, the is_cold heuristics can yield
1726 // different outcomes, so we guard the computed result with a CAS
1727 // to ensure all threads have a shared view of whether an nmethod
1728 // is_unloading or not.
1729 uint8_t found_state = Atomic::cmpxchg(&_is_unloading_state, state, new_state, memory_order_relaxed);
1730
1731 if (found_state == state) {
1732 // First to change state, we win
1733 return state_is_unloading;
1734 } else {
1735 // State already set, so use it
1736 return IsUnloadingState::is_unloading(found_state);
1737 }
1738 }
1739
1740 void nmethod::clear_unloading_state() {
1741 uint8_t state = IsUnloadingState::create(false, CodeCache::unloading_cycle());
1742 Atomic::store(&_is_unloading_state, state);
1743 }
1744
1745
1746 // This is called at the end of the strong tracing/marking phase of a
1747 // GC to unload an nmethod if it contains otherwise unreachable
1748 // oops or is heuristically found to be not important.
1749 void nmethod::do_unloading(bool unloading_occurred) {
1750 // Make sure the oop's ready to receive visitors
1751 if (is_unloading()) {
1752 unlink();
1753 } else {
1754 guarantee(unload_nmethod_caches(unloading_occurred),
1755 "Should not need transition stubs");
1756 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
1757 if (bs_nm != nullptr) {
1758 bs_nm->disarm(this);
1759 }
1760 }
1761 }
1762
1763 void nmethod::oops_do(OopClosure* f, bool allow_dead) {
1764 // Prevent extra code cache walk for platforms that don't have immediate oops.
1765 if (relocInfo::mustIterateImmediateOopsInCode()) {
1766 RelocIterator iter(this, oops_reloc_begin());
1767
1768 while (iter.next()) {
1769 if (iter.type() == relocInfo::oop_type ) {
1770 oop_Relocation* r = iter.oop_reloc();
1771 // In this loop, we must only follow those oops directly embedded in
1772 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1773 assert(1 == (r->oop_is_immediate()) +
1774 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1775 "oop must be found in exactly one place");
1776 if (r->oop_is_immediate() && r->oop_value() != nullptr) {
1777 f->do_oop(r->oop_addr());
1778 }
1779 }
1780 }
1781 }
1782
1783 // Scopes
1784 // This includes oop constants not inlined in the code stream.
1785 for (oop* p = oops_begin(); p < oops_end(); p++) {
1786 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1787 f->do_oop(p);
1788 }
1789 }
1790
1791 void nmethod::follow_nmethod(OopIterateClosure* cl) {
1792 // Process oops in the nmethod
1793 oops_do(cl);
1794
1795 // CodeCache unloading support
1796 mark_as_maybe_on_stack();
1797
1798 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
1799 bs_nm->disarm(this);
1800
1801 // There's an assumption made that this function is not used by GCs that
1802 // relocate objects, and therefore we don't call fix_oop_relocations.
1803 }
1804
1805 nmethod* volatile nmethod::_oops_do_mark_nmethods;
1806
1807 void nmethod::oops_do_log_change(const char* state) {
1808 LogTarget(Trace, gc, nmethod) lt;
1809 if (lt.is_enabled()) {
1810 LogStream ls(lt);
1811 CompileTask::print(&ls, this, state, true /* short_form */);
1812 }
1813 }
1814
1815 bool nmethod::oops_do_try_claim() {
1816 if (oops_do_try_claim_weak_request()) {
1817 nmethod* result = oops_do_try_add_to_list_as_weak_done();
1818 assert(result == nullptr, "adding to global list as weak done must always succeed.");
1819 return true;
1820 }
1821 return false;
1822 }
1823
1824 bool nmethod::oops_do_try_claim_weak_request() {
1825 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
1826
1827 if ((_oops_do_mark_link == nullptr) &&
1828 (Atomic::replace_if_null(&_oops_do_mark_link, mark_link(this, claim_weak_request_tag)))) {
1829 oops_do_log_change("oops_do, mark weak request");
1830 return true;
1831 }
1832 return false;
1833 }
1834
1835 void nmethod::oops_do_set_strong_done(nmethod* old_head) {
1836 _oops_do_mark_link = mark_link(old_head, claim_strong_done_tag);
1837 }
1838
1839 nmethod::oops_do_mark_link* nmethod::oops_do_try_claim_strong_done() {
1840 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
1841
1842 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));
1843 if (old_next == nullptr) {
1844 oops_do_log_change("oops_do, mark strong done");
1845 }
1846 return old_next;
1847 }
1848
1849 nmethod::oops_do_mark_link* nmethod::oops_do_try_add_strong_request(nmethod::oops_do_mark_link* next) {
1850 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
1851 assert(next == mark_link(this, claim_weak_request_tag), "Should be claimed as weak");
1852
1853 oops_do_mark_link* old_next = Atomic::cmpxchg(&_oops_do_mark_link, next, mark_link(this, claim_strong_request_tag));
1854 if (old_next == next) {
1855 oops_do_log_change("oops_do, mark strong request");
1856 }
1857 return old_next;
1858 }
1859
1860 bool nmethod::oops_do_try_claim_weak_done_as_strong_done(nmethod::oops_do_mark_link* next) {
1861 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
1862 assert(extract_state(next) == claim_weak_done_tag, "Should be claimed as weak done");
1863
1864 oops_do_mark_link* old_next = Atomic::cmpxchg(&_oops_do_mark_link, next, mark_link(extract_nmethod(next), claim_strong_done_tag));
1865 if (old_next == next) {
1866 oops_do_log_change("oops_do, mark weak done -> mark strong done");
1867 return true;
1868 }
1869 return false;
1870 }
1871
1872 nmethod* nmethod::oops_do_try_add_to_list_as_weak_done() {
1873 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
1874
1875 assert(extract_state(_oops_do_mark_link) == claim_weak_request_tag ||
1876 extract_state(_oops_do_mark_link) == claim_strong_request_tag,
1877 "must be but is nmethod " PTR_FORMAT " %u", p2i(extract_nmethod(_oops_do_mark_link)), extract_state(_oops_do_mark_link));
1878
1879 nmethod* old_head = Atomic::xchg(&_oops_do_mark_nmethods, this);
1880 // Self-loop if needed.
1881 if (old_head == nullptr) {
1882 old_head = this;
1883 }
1884 // Try to install end of list and weak done tag.
1885 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)) {
1886 oops_do_log_change("oops_do, mark weak done");
1887 return nullptr;
1888 } else {
1889 return old_head;
1890 }
1891 }
1892
1893 void nmethod::oops_do_add_to_list_as_strong_done() {
1894 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
1895
1896 nmethod* old_head = Atomic::xchg(&_oops_do_mark_nmethods, this);
1897 // Self-loop if needed.
1898 if (old_head == nullptr) {
1899 old_head = this;
1900 }
1901 assert(_oops_do_mark_link == mark_link(this, claim_strong_done_tag), "must be but is nmethod " PTR_FORMAT " state %u",
1902 p2i(extract_nmethod(_oops_do_mark_link)), extract_state(_oops_do_mark_link));
1903
1904 oops_do_set_strong_done(old_head);
1905 }
1906
1907 void nmethod::oops_do_process_weak(OopsDoProcessor* p) {
1908 if (!oops_do_try_claim_weak_request()) {
1909 // Failed to claim for weak processing.
1910 oops_do_log_change("oops_do, mark weak request fail");
1911 return;
1912 }
1913
1914 p->do_regular_processing(this);
1915
1916 nmethod* old_head = oops_do_try_add_to_list_as_weak_done();
1917 if (old_head == nullptr) {
1918 return;
1919 }
1920 oops_do_log_change("oops_do, mark weak done fail");
1921 // Adding to global list failed, another thread added a strong request.
1922 assert(extract_state(_oops_do_mark_link) == claim_strong_request_tag,
1923 "must be but is %u", extract_state(_oops_do_mark_link));
1924
1925 oops_do_log_change("oops_do, mark weak request -> mark strong done");
1926
1927 oops_do_set_strong_done(old_head);
1928 // Do missing strong processing.
1929 p->do_remaining_strong_processing(this);
1930 }
1931
1932 void nmethod::oops_do_process_strong(OopsDoProcessor* p) {
1933 oops_do_mark_link* next_raw = oops_do_try_claim_strong_done();
1934 if (next_raw == nullptr) {
1935 p->do_regular_processing(this);
1936 oops_do_add_to_list_as_strong_done();
1937 return;
1938 }
1939 // Claim failed. Figure out why and handle it.
1940 if (oops_do_has_weak_request(next_raw)) {
1941 oops_do_mark_link* old = next_raw;
1942 // Claim failed because being weak processed (state == "weak request").
1943 // Try to request deferred strong processing.
1944 next_raw = oops_do_try_add_strong_request(old);
1945 if (next_raw == old) {
1946 // Successfully requested deferred strong processing.
1947 return;
1948 }
1949 // Failed because of a concurrent transition. No longer in "weak request" state.
1950 }
1951 if (oops_do_has_any_strong_state(next_raw)) {
1952 // Already claimed for strong processing or requested for such.
1953 return;
1954 }
1955 if (oops_do_try_claim_weak_done_as_strong_done(next_raw)) {
1956 // Successfully claimed "weak done" as "strong done". Do the missing marking.
1957 p->do_remaining_strong_processing(this);
1958 return;
1959 }
1960 // Claim failed, some other thread got it.
1961 }
1962
1963 void nmethod::oops_do_marking_prologue() {
1964 assert_at_safepoint();
1965
1966 log_trace(gc, nmethod)("oops_do_marking_prologue");
1967 assert(_oops_do_mark_nmethods == nullptr, "must be empty");
1968 }
1969
1970 void nmethod::oops_do_marking_epilogue() {
1971 assert_at_safepoint();
1972
1973 nmethod* next = _oops_do_mark_nmethods;
1974 _oops_do_mark_nmethods = nullptr;
1975 if (next != nullptr) {
1976 nmethod* cur;
1977 do {
1978 cur = next;
1979 next = extract_nmethod(cur->_oops_do_mark_link);
1980 cur->_oops_do_mark_link = nullptr;
1981 DEBUG_ONLY(cur->verify_oop_relocations());
1982
1983 LogTarget(Trace, gc, nmethod) lt;
1984 if (lt.is_enabled()) {
1985 LogStream ls(lt);
1986 CompileTask::print(&ls, cur, "oops_do, unmark", /*short_form:*/ true);
1987 }
1988 // End if self-loop has been detected.
1989 } while (cur != next);
1990 }
1991 log_trace(gc, nmethod)("oops_do_marking_epilogue");
1992 }
1993
1994 inline bool includes(void* p, void* from, void* to) {
1995 return from <= p && p < to;
1996 }
1997
1998
1999 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
2000 assert(count >= 2, "must be sentinel values, at least");
2001
2002 #ifdef ASSERT
2003 // must be sorted and unique; we do a binary search in find_pc_desc()
2004 int prev_offset = pcs[0].pc_offset();
2005 assert(prev_offset == PcDesc::lower_offset_limit,
2006 "must start with a sentinel");
2007 for (int i = 1; i < count; i++) {
2008 int this_offset = pcs[i].pc_offset();
2009 assert(this_offset > prev_offset, "offsets must be sorted");
2010 prev_offset = this_offset;
2011 }
2012 assert(prev_offset == PcDesc::upper_offset_limit,
2013 "must end with a sentinel");
2014 #endif //ASSERT
2015
2016 // Search for MethodHandle invokes and tag the nmethod.
2017 for (int i = 0; i < count; i++) {
2018 if (pcs[i].is_method_handle_invoke()) {
2019 set_has_method_handle_invokes(true);
2020 break;
2021 }
2022 }
2023 assert(has_method_handle_invokes() == (_deopt_mh_handler_begin != nullptr), "must have deopt mh handler");
2024
2025 int size = count * sizeof(PcDesc);
2026 assert(scopes_pcs_size() >= size, "oob");
2027 memcpy(scopes_pcs_begin(), pcs, size);
2028
2029 // Adjust the final sentinel downward.
2030 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
2031 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
2032 last_pc->set_pc_offset(content_size() + 1);
2033 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
2034 // Fill any rounding gaps with copies of the last record.
2035 last_pc[1] = last_pc[0];
2036 }
2037 // The following assert could fail if sizeof(PcDesc) is not
2038 // an integral multiple of oopSize (the rounding term).
2039 // If it fails, change the logic to always allocate a multiple
2040 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
2041 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
2042 }
2043
2044 void nmethod::copy_scopes_data(u_char* buffer, int size) {
2045 assert(scopes_data_size() >= size, "oob");
2046 memcpy(scopes_data_begin(), buffer, size);
2047 }
2048
2049 #ifdef ASSERT
2050 static PcDesc* linear_search(const PcDescSearch& search, int pc_offset, bool approximate) {
2051 PcDesc* lower = search.scopes_pcs_begin();
2052 PcDesc* upper = search.scopes_pcs_end();
2053 lower += 1; // exclude initial sentinel
2054 PcDesc* res = nullptr;
2055 for (PcDesc* p = lower; p < upper; p++) {
2056 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc
2057 if (match_desc(p, pc_offset, approximate)) {
2058 if (res == nullptr)
2059 res = p;
2060 else
2061 res = (PcDesc*) badAddress;
2062 }
2063 }
2064 return res;
2065 }
2066 #endif
2067
2068
2069 // Finds a PcDesc with real-pc equal to "pc"
2070 PcDesc* PcDescContainer::find_pc_desc_internal(address pc, bool approximate, const PcDescSearch& search) {
2071 address base_address = search.code_begin();
2072 if ((pc < base_address) ||
2073 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
2074 return nullptr; // PC is wildly out of range
2075 }
2076 int pc_offset = (int) (pc - base_address);
2077
2078 // Check the PcDesc cache if it contains the desired PcDesc
2079 // (This as an almost 100% hit rate.)
2080 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
2081 if (res != nullptr) {
2082 assert(res == linear_search(search, pc_offset, approximate), "cache ok");
2083 return res;
2084 }
2085
2086 // Fallback algorithm: quasi-linear search for the PcDesc
2087 // Find the last pc_offset less than the given offset.
2088 // The successor must be the required match, if there is a match at all.
2089 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
2090 PcDesc* lower = search.scopes_pcs_begin();
2091 PcDesc* upper = search.scopes_pcs_end();
2092 upper -= 1; // exclude final sentinel
2093 if (lower >= upper) return nullptr; // native method; no PcDescs at all
2094
2095 #define assert_LU_OK \
2096 /* invariant on lower..upper during the following search: */ \
2097 assert(lower->pc_offset() < pc_offset, "sanity"); \
2098 assert(upper->pc_offset() >= pc_offset, "sanity")
2099 assert_LU_OK;
2100
2101 // Use the last successful return as a split point.
2102 PcDesc* mid = _pc_desc_cache.last_pc_desc();
2103 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
2104 if (mid->pc_offset() < pc_offset) {
2105 lower = mid;
2106 } else {
2107 upper = mid;
2108 }
2109
2110 // Take giant steps at first (4096, then 256, then 16, then 1)
2111 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
2112 const int RADIX = (1 << LOG2_RADIX);
2113 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
2114 while ((mid = lower + step) < upper) {
2115 assert_LU_OK;
2116 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
2117 if (mid->pc_offset() < pc_offset) {
2118 lower = mid;
2119 } else {
2120 upper = mid;
2121 break;
2122 }
2123 }
2124 assert_LU_OK;
2125 }
2126
2127 // Sneak up on the value with a linear search of length ~16.
2128 while (true) {
2129 assert_LU_OK;
2130 mid = lower + 1;
2131 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
2132 if (mid->pc_offset() < pc_offset) {
2133 lower = mid;
2134 } else {
2135 upper = mid;
2136 break;
2137 }
2138 }
2139 #undef assert_LU_OK
2140
2141 if (match_desc(upper, pc_offset, approximate)) {
2142 assert(upper == linear_search(search, pc_offset, approximate), "search ok");
2143 if (!Thread::current_in_asgct()) {
2144 // we don't want to modify the cache if we're in ASGCT
2145 // which is typically called in a signal handler
2146 _pc_desc_cache.add_pc_desc(upper);
2147 }
2148 return upper;
2149 } else {
2150 assert(nullptr == linear_search(search, pc_offset, approximate), "search ok");
2151 return nullptr;
2152 }
2153 }
2154
2155 bool nmethod::check_dependency_on(DepChange& changes) {
2156 // What has happened:
2157 // 1) a new class dependee has been added
2158 // 2) dependee and all its super classes have been marked
2159 bool found_check = false; // set true if we are upset
2160 for (Dependencies::DepStream deps(this); deps.next(); ) {
2161 // Evaluate only relevant dependencies.
2162 if (deps.spot_check_dependency_at(changes) != nullptr) {
2163 found_check = true;
2164 NOT_DEBUG(break);
2165 }
2166 }
2167 return found_check;
2168 }
2169
2170 // Called from mark_for_deoptimization, when dependee is invalidated.
2171 bool nmethod::is_dependent_on_method(Method* dependee) {
2172 for (Dependencies::DepStream deps(this); deps.next(); ) {
2173 if (deps.type() != Dependencies::evol_method)
2174 continue;
2175 Method* method = deps.method_argument(0);
2176 if (method == dependee) return true;
2177 }
2178 return false;
2179 }
2180
2181 void nmethod_init() {
2182 // make sure you didn't forget to adjust the filler fields
2183 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
2184 }
2185
2186 // -----------------------------------------------------------------------------
2187 // Verification
2188
2189 class VerifyOopsClosure: public OopClosure {
2190 nmethod* _nm;
2191 bool _ok;
2192 public:
2193 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
2194 bool ok() { return _ok; }
2195 virtual void do_oop(oop* p) {
2196 if (oopDesc::is_oop_or_null(*p)) return;
2197 // Print diagnostic information before calling print_nmethod().
2198 // Assertions therein might prevent call from returning.
2199 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2200 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2201 if (_ok) {
2202 _nm->print_nmethod(true);
2203 _ok = false;
2204 }
2205 }
2206 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2207 };
2208
2209 class VerifyMetadataClosure: public MetadataClosure {
2210 public:
2211 void do_metadata(Metadata* md) {
2212 if (md->is_method()) {
2213 Method* method = (Method*)md;
2214 assert(!method->is_old(), "Should not be installing old methods");
2215 }
2216 }
2217 };
2218
2219
2220 void nmethod::verify() {
2221 if (is_not_entrant())
2222 return;
2223
2224 // Make sure all the entry points are correctly aligned for patching.
2225 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
2226
2227 // assert(oopDesc::is_oop(method()), "must be valid");
2228
2229 ResourceMark rm;
2230
2231 if (!CodeCache::contains(this)) {
2232 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this));
2233 }
2234
2235 if(is_native_method() )
2236 return;
2237
2238 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
2239 if (nm != this) {
2240 fatal("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this));
2241 }
2242
2243 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2244 if (! p->verify(this)) {
2245 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this));
2246 }
2247 }
2248
2249 #ifdef ASSERT
2250 #if INCLUDE_JVMCI
2251 {
2252 // Verify that implicit exceptions that deoptimize have a PcDesc and OopMap
2253 ImmutableOopMapSet* oms = oop_maps();
2254 ImplicitExceptionTable implicit_table(this);
2255 for (uint i = 0; i < implicit_table.len(); i++) {
2256 int exec_offset = (int) implicit_table.get_exec_offset(i);
2257 if (implicit_table.get_exec_offset(i) == implicit_table.get_cont_offset(i)) {
2258 assert(pc_desc_at(code_begin() + exec_offset) != nullptr, "missing PcDesc");
2259 bool found = false;
2260 for (int i = 0, imax = oms->count(); i < imax; i++) {
2261 if (oms->pair_at(i)->pc_offset() == exec_offset) {
2262 found = true;
2263 break;
2264 }
2265 }
2266 assert(found, "missing oopmap");
2267 }
2268 }
2269 }
2270 #endif
2271 #endif
2272
2273 VerifyOopsClosure voc(this);
2274 oops_do(&voc);
2275 assert(voc.ok(), "embedded oops must be OK");
2276 Universe::heap()->verify_nmethod(this);
2277
2278 assert(_oops_do_mark_link == nullptr, "_oops_do_mark_link for %s should be nullptr but is " PTR_FORMAT,
2279 nm->method()->external_name(), p2i(_oops_do_mark_link));
2280 verify_scopes();
2281
2282 CompiledICLocker nm_verify(this);
2283 VerifyMetadataClosure vmc;
2284 metadata_do(&vmc);
2285 }
2286
2287
2288 void nmethod::verify_interrupt_point(address call_site) {
2289
2290 // Verify IC only when nmethod installation is finished.
2291 if (!is_not_installed()) {
2292 if (CompiledICLocker::is_safe(this)) {
2293 CompiledIC_at(this, call_site);
2294 } else {
2295 CompiledICLocker ml_verify(this);
2296 CompiledIC_at(this, call_site);
2297 }
2298 }
2299
2300 HandleMark hm(Thread::current());
2301
2302 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address());
2303 assert(pd != nullptr, "PcDesc must exist");
2304 for (ScopeDesc* sd = new ScopeDesc(this, pd);
2305 !sd->is_top(); sd = sd->sender()) {
2306 sd->verify();
2307 }
2308 }
2309
2310 void nmethod::verify_scopes() {
2311 if( !method() ) return; // Runtime stubs have no scope
2312 if (method()->is_native()) return; // Ignore stub methods.
2313 // iterate through all interrupt point
2314 // and verify the debug information is valid.
2315 RelocIterator iter((nmethod*)this);
2316 while (iter.next()) {
2317 address stub = nullptr;
2318 switch (iter.type()) {
2319 case relocInfo::virtual_call_type:
2320 verify_interrupt_point(iter.addr());
2321 break;
2322 case relocInfo::opt_virtual_call_type:
2323 stub = iter.opt_virtual_call_reloc()->static_stub();
2324 verify_interrupt_point(iter.addr());
2325 break;
2326 case relocInfo::static_call_type:
2327 stub = iter.static_call_reloc()->static_stub();
2328 //verify_interrupt_point(iter.addr());
2329 break;
2330 case relocInfo::runtime_call_type:
2331 case relocInfo::runtime_call_w_cp_type: {
2332 address destination = iter.reloc()->value();
2333 // Right now there is no way to find out which entries support
2334 // an interrupt point. It would be nice if we had this
2335 // information in a table.
2336 break;
2337 }
2338 default:
2339 break;
2340 }
2341 assert(stub == nullptr || stub_contains(stub), "static call stub outside stub section");
2342 }
2343 }
2344
2345
2346 // -----------------------------------------------------------------------------
2347 // Printing operations
2348
2349 void nmethod::print() const {
2350 ttyLocker ttyl; // keep the following output all in one block
2351 print(tty);
2352 }
2353
2354 void nmethod::print(outputStream* st) const {
2355 ResourceMark rm;
2356
2357 st->print("Compiled method ");
2358
2359 if (is_compiled_by_c1()) {
2360 st->print("(c1) ");
2361 } else if (is_compiled_by_c2()) {
2362 st->print("(c2) ");
2363 } else if (is_compiled_by_jvmci()) {
2364 st->print("(JVMCI) ");
2365 } else {
2366 st->print("(n/a) ");
2367 }
2368
2369 print_on(st, nullptr);
2370
2371 if (WizardMode) {
2372 st->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this));
2373 st->print(" for method " INTPTR_FORMAT , p2i(method()));
2374 st->print(" { ");
2375 st->print_cr("%s ", state());
2376 st->print_cr("}:");
2377 }
2378 if (size () > 0) st->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2379 p2i(this),
2380 p2i(this) + size(),
2381 size());
2382 if (relocation_size () > 0) st->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2383 p2i(relocation_begin()),
2384 p2i(relocation_end()),
2385 relocation_size());
2386 if (consts_size () > 0) st->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2387 p2i(consts_begin()),
2388 p2i(consts_end()),
2389 consts_size());
2390 if (insts_size () > 0) st->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2391 p2i(insts_begin()),
2392 p2i(insts_end()),
2393 insts_size());
2394 if (stub_size () > 0) st->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2395 p2i(stub_begin()),
2396 p2i(stub_end()),
2397 stub_size());
2398 if (oops_size () > 0) st->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2399 p2i(oops_begin()),
2400 p2i(oops_end()),
2401 oops_size());
2402 if (metadata_size () > 0) st->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2403 p2i(metadata_begin()),
2404 p2i(metadata_end()),
2405 metadata_size());
2406 if (scopes_data_size () > 0) st->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2407 p2i(scopes_data_begin()),
2408 p2i(scopes_data_end()),
2409 scopes_data_size());
2410 if (scopes_pcs_size () > 0) st->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2411 p2i(scopes_pcs_begin()),
2412 p2i(scopes_pcs_end()),
2413 scopes_pcs_size());
2414 if (dependencies_size () > 0) st->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2415 p2i(dependencies_begin()),
2416 p2i(dependencies_end()),
2417 dependencies_size());
2418 if (handler_table_size() > 0) st->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2419 p2i(handler_table_begin()),
2420 p2i(handler_table_end()),
2421 handler_table_size());
2422 if (nul_chk_table_size() > 0) st->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2423 p2i(nul_chk_table_begin()),
2424 p2i(nul_chk_table_end()),
2425 nul_chk_table_size());
2426 #if INCLUDE_JVMCI
2427 if (speculations_size () > 0) st->print_cr(" speculations [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2428 p2i(speculations_begin()),
2429 p2i(speculations_end()),
2430 speculations_size());
2431 if (jvmci_data_size () > 0) st->print_cr(" JVMCI data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2432 p2i(jvmci_data_begin()),
2433 p2i(jvmci_data_end()),
2434 jvmci_data_size());
2435 #endif
2436 }
2437
2438 void nmethod::print_code() {
2439 ResourceMark m;
2440 ttyLocker ttyl;
2441 // Call the specialized decode method of this class.
2442 decode(tty);
2443 }
2444
2445 #ifndef PRODUCT // called InstanceKlass methods are available only then. Declared as PRODUCT_RETURN
2446
2447 void nmethod::print_dependencies_on(outputStream* out) {
2448 ResourceMark rm;
2449 stringStream st;
2450 st.print_cr("Dependencies:");
2451 for (Dependencies::DepStream deps(this); deps.next(); ) {
2452 deps.print_dependency(&st);
2453 InstanceKlass* ctxk = deps.context_type();
2454 if (ctxk != nullptr) {
2455 if (ctxk->is_dependent_nmethod(this)) {
2456 st.print_cr(" [nmethod<=klass]%s", ctxk->external_name());
2457 }
2458 }
2459 deps.log_dependency(); // put it into the xml log also
2460 }
2461 out->print_raw(st.as_string());
2462 }
2463 #endif
2464
2465 #if defined(SUPPORT_DATA_STRUCTS)
2466
2467 // Print the oops from the underlying CodeBlob.
2468 void nmethod::print_oops(outputStream* st) {
2469 ResourceMark m;
2470 st->print("Oops:");
2471 if (oops_begin() < oops_end()) {
2472 st->cr();
2473 for (oop* p = oops_begin(); p < oops_end(); p++) {
2474 Disassembler::print_location((unsigned char*)p, (unsigned char*)oops_begin(), (unsigned char*)oops_end(), st, true, false);
2475 st->print(PTR_FORMAT " ", *((uintptr_t*)p));
2476 if (Universe::contains_non_oop_word(p)) {
2477 st->print_cr("NON_OOP");
2478 continue; // skip non-oops
2479 }
2480 if (*p == nullptr) {
2481 st->print_cr("nullptr-oop");
2482 continue; // skip non-oops
2483 }
2484 (*p)->print_value_on(st);
2485 st->cr();
2486 }
2487 } else {
2488 st->print_cr(" <list empty>");
2489 }
2490 }
2491
2492 // Print metadata pool.
2493 void nmethod::print_metadata(outputStream* st) {
2494 ResourceMark m;
2495 st->print("Metadata:");
2496 if (metadata_begin() < metadata_end()) {
2497 st->cr();
2498 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
2499 Disassembler::print_location((unsigned char*)p, (unsigned char*)metadata_begin(), (unsigned char*)metadata_end(), st, true, false);
2500 st->print(PTR_FORMAT " ", *((uintptr_t*)p));
2501 if (*p && *p != Universe::non_oop_word()) {
2502 (*p)->print_value_on(st);
2503 }
2504 st->cr();
2505 }
2506 } else {
2507 st->print_cr(" <list empty>");
2508 }
2509 }
2510
2511 #ifndef PRODUCT // ScopeDesc::print_on() is available only then. Declared as PRODUCT_RETURN
2512 void nmethod::print_scopes_on(outputStream* st) {
2513 // Find the first pc desc for all scopes in the code and print it.
2514 ResourceMark rm;
2515 st->print("scopes:");
2516 if (scopes_pcs_begin() < scopes_pcs_end()) {
2517 st->cr();
2518 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2519 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
2520 continue;
2521
2522 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
2523 while (sd != nullptr) {
2524 sd->print_on(st, p); // print output ends with a newline
2525 sd = sd->sender();
2526 }
2527 }
2528 } else {
2529 st->print_cr(" <list empty>");
2530 }
2531 }
2532 #endif
2533
2534 #ifndef PRODUCT // RelocIterator does support printing only then.
2535 void nmethod::print_relocations() {
2536 ResourceMark m; // in case methods get printed via the debugger
2537 tty->print_cr("relocations:");
2538 RelocIterator iter(this);
2539 iter.print();
2540 }
2541 #endif
2542
2543 void nmethod::print_pcs_on(outputStream* st) {
2544 ResourceMark m; // in case methods get printed via debugger
2545 st->print("pc-bytecode offsets:");
2546 if (scopes_pcs_begin() < scopes_pcs_end()) {
2547 st->cr();
2548 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2549 p->print_on(st, this); // print output ends with a newline
2550 }
2551 } else {
2552 st->print_cr(" <list empty>");
2553 }
2554 }
2555
2556 void nmethod::print_handler_table() {
2557 ExceptionHandlerTable(this).print(code_begin());
2558 }
2559
2560 void nmethod::print_nul_chk_table() {
2561 ImplicitExceptionTable(this).print(code_begin());
2562 }
2563
2564 void nmethod::print_recorded_oop(int log_n, int i) {
2565 void* value;
2566
2567 if (i == 0) {
2568 value = nullptr;
2569 } else {
2570 // Be careful around non-oop words. Don't create an oop
2571 // with that value, or it will assert in verification code.
2572 if (Universe::contains_non_oop_word(oop_addr_at(i))) {
2573 value = Universe::non_oop_word();
2574 } else {
2575 value = oop_at(i);
2576 }
2577 }
2578
2579 tty->print("#%*d: " INTPTR_FORMAT " ", log_n, i, p2i(value));
2580
2581 if (value == Universe::non_oop_word()) {
2582 tty->print("non-oop word");
2583 } else {
2584 if (value == 0) {
2585 tty->print("nullptr-oop");
2586 } else {
2587 oop_at(i)->print_value_on(tty);
2588 }
2589 }
2590
2591 tty->cr();
2592 }
2593
2594 void nmethod::print_recorded_oops() {
2595 const int n = oops_count();
2596 const int log_n = (n<10) ? 1 : (n<100) ? 2 : (n<1000) ? 3 : (n<10000) ? 4 : 6;
2597 tty->print("Recorded oops:");
2598 if (n > 0) {
2599 tty->cr();
2600 for (int i = 0; i < n; i++) {
2601 print_recorded_oop(log_n, i);
2602 }
2603 } else {
2604 tty->print_cr(" <list empty>");
2605 }
2606 }
2607
2608 void nmethod::print_recorded_metadata() {
2609 const int n = metadata_count();
2610 const int log_n = (n<10) ? 1 : (n<100) ? 2 : (n<1000) ? 3 : (n<10000) ? 4 : 6;
2611 tty->print("Recorded metadata:");
2612 if (n > 0) {
2613 tty->cr();
2614 for (int i = 0; i < n; i++) {
2615 Metadata* m = metadata_at(i);
2616 tty->print("#%*d: " INTPTR_FORMAT " ", log_n, i, p2i(m));
2617 if (m == (Metadata*)Universe::non_oop_word()) {
2618 tty->print("non-metadata word");
2619 } else if (m == nullptr) {
2620 tty->print("nullptr-oop");
2621 } else {
2622 Metadata::print_value_on_maybe_null(tty, m);
2623 }
2624 tty->cr();
2625 }
2626 } else {
2627 tty->print_cr(" <list empty>");
2628 }
2629 }
2630 #endif
2631
2632 #if defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_ABSTRACT_ASSEMBLY)
2633
2634 void nmethod::print_constant_pool(outputStream* st) {
2635 //-----------------------------------
2636 //---< Print the constant pool >---
2637 //-----------------------------------
2638 int consts_size = this->consts_size();
2639 if ( consts_size > 0 ) {
2640 unsigned char* cstart = this->consts_begin();
2641 unsigned char* cp = cstart;
2642 unsigned char* cend = cp + consts_size;
2643 unsigned int bytes_per_line = 4;
2644 unsigned int CP_alignment = 8;
2645 unsigned int n;
2646
2647 st->cr();
2648
2649 //---< print CP header to make clear what's printed >---
2650 if( ((uintptr_t)cp&(CP_alignment-1)) == 0 ) {
2651 n = bytes_per_line;
2652 st->print_cr("[Constant Pool]");
2653 Disassembler::print_location(cp, cstart, cend, st, true, true);
2654 Disassembler::print_hexdata(cp, n, st, true);
2655 st->cr();
2656 } else {
2657 n = (int)((uintptr_t)cp & (bytes_per_line-1));
2658 st->print_cr("[Constant Pool (unaligned)]");
2659 }
2660
2661 //---< print CP contents, bytes_per_line at a time >---
2662 while (cp < cend) {
2663 Disassembler::print_location(cp, cstart, cend, st, true, false);
2664 Disassembler::print_hexdata(cp, n, st, false);
2665 cp += n;
2666 n = bytes_per_line;
2667 st->cr();
2668 }
2669
2670 //---< Show potential alignment gap between constant pool and code >---
2671 cend = code_begin();
2672 if( cp < cend ) {
2673 n = 4;
2674 st->print_cr("[Code entry alignment]");
2675 while (cp < cend) {
2676 Disassembler::print_location(cp, cstart, cend, st, false, false);
2677 cp += n;
2678 st->cr();
2679 }
2680 }
2681 } else {
2682 st->print_cr("[Constant Pool (empty)]");
2683 }
2684 st->cr();
2685 }
2686
2687 #endif
2688
2689 // Disassemble this nmethod.
2690 // Print additional debug information, if requested. This could be code
2691 // comments, block comments, profiling counters, etc.
2692 // The undisassembled format is useful no disassembler library is available.
2693 // The resulting hex dump (with markers) can be disassembled later, or on
2694 // another system, when/where a disassembler library is available.
2695 void nmethod::decode2(outputStream* ost) const {
2696
2697 // Called from frame::back_trace_with_decode without ResourceMark.
2698 ResourceMark rm;
2699
2700 // Make sure we have a valid stream to print on.
2701 outputStream* st = ost ? ost : tty;
2702
2703 #if defined(SUPPORT_ABSTRACT_ASSEMBLY) && ! defined(SUPPORT_ASSEMBLY)
2704 const bool use_compressed_format = true;
2705 const bool compressed_with_comments = use_compressed_format && (AbstractDisassembler::show_comment() ||
2706 AbstractDisassembler::show_block_comment());
2707 #else
2708 const bool use_compressed_format = Disassembler::is_abstract();
2709 const bool compressed_with_comments = use_compressed_format && (AbstractDisassembler::show_comment() ||
2710 AbstractDisassembler::show_block_comment());
2711 #endif
2712
2713 st->cr();
2714 this->print(st);
2715 st->cr();
2716
2717 #if defined(SUPPORT_ASSEMBLY)
2718 //----------------------------------
2719 //---< Print real disassembly >---
2720 //----------------------------------
2721 if (! use_compressed_format) {
2722 st->print_cr("[Disassembly]");
2723 Disassembler::decode(const_cast<nmethod*>(this), st);
2724 st->bol();
2725 st->print_cr("[/Disassembly]");
2726 return;
2727 }
2728 #endif
2729
2730 #if defined(SUPPORT_ABSTRACT_ASSEMBLY)
2731
2732 // Compressed undisassembled disassembly format.
2733 // The following status values are defined/supported:
2734 // = 0 - currently at bol() position, nothing printed yet on current line.
2735 // = 1 - currently at position after print_location().
2736 // > 1 - in the midst of printing instruction stream bytes.
2737 int compressed_format_idx = 0;
2738 int code_comment_column = 0;
2739 const int instr_maxlen = Assembler::instr_maxlen();
2740 const uint tabspacing = 8;
2741 unsigned char* start = this->code_begin();
2742 unsigned char* p = this->code_begin();
2743 unsigned char* end = this->code_end();
2744 unsigned char* pss = p; // start of a code section (used for offsets)
2745
2746 if ((start == nullptr) || (end == nullptr)) {
2747 st->print_cr("PrintAssembly not possible due to uninitialized section pointers");
2748 return;
2749 }
2750 #endif
2751
2752 #if defined(SUPPORT_ABSTRACT_ASSEMBLY)
2753 //---< plain abstract disassembly, no comments or anything, just section headers >---
2754 if (use_compressed_format && ! compressed_with_comments) {
2755 const_cast<nmethod*>(this)->print_constant_pool(st);
2756
2757 //---< Open the output (Marker for post-mortem disassembler) >---
2758 st->print_cr("[MachCode]");
2759 const char* header = nullptr;
2760 address p0 = p;
2761 while (p < end) {
2762 address pp = p;
2763 while ((p < end) && (header == nullptr)) {
2764 header = nmethod_section_label(p);
2765 pp = p;
2766 p += Assembler::instr_len(p);
2767 }
2768 if (pp > p0) {
2769 AbstractDisassembler::decode_range_abstract(p0, pp, start, end, st, Assembler::instr_maxlen());
2770 p0 = pp;
2771 p = pp;
2772 header = nullptr;
2773 } else if (header != nullptr) {
2774 st->bol();
2775 st->print_cr("%s", header);
2776 header = nullptr;
2777 }
2778 }
2779 //---< Close the output (Marker for post-mortem disassembler) >---
2780 st->bol();
2781 st->print_cr("[/MachCode]");
2782 return;
2783 }
2784 #endif
2785
2786 #if defined(SUPPORT_ABSTRACT_ASSEMBLY)
2787 //---< abstract disassembly with comments and section headers merged in >---
2788 if (compressed_with_comments) {
2789 const_cast<nmethod*>(this)->print_constant_pool(st);
2790
2791 //---< Open the output (Marker for post-mortem disassembler) >---
2792 st->print_cr("[MachCode]");
2793 while ((p < end) && (p != nullptr)) {
2794 const int instruction_size_in_bytes = Assembler::instr_len(p);
2795
2796 //---< Block comments for nmethod. Interrupts instruction stream, if any. >---
2797 // Outputs a bol() before and a cr() after, but only if a comment is printed.
2798 // Prints nmethod_section_label as well.
2799 if (AbstractDisassembler::show_block_comment()) {
2800 print_block_comment(st, p);
2801 if (st->position() == 0) {
2802 compressed_format_idx = 0;
2803 }
2804 }
2805
2806 //---< New location information after line break >---
2807 if (compressed_format_idx == 0) {
2808 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false);
2809 compressed_format_idx = 1;
2810 }
2811
2812 //---< Code comment for current instruction. Address range [p..(p+len)) >---
2813 unsigned char* p_end = p + (ssize_t)instruction_size_in_bytes;
2814 S390_ONLY(if (p_end > end) p_end = end;) // avoid getting past the end
2815
2816 if (AbstractDisassembler::show_comment() && const_cast<nmethod*>(this)->has_code_comment(p, p_end)) {
2817 //---< interrupt instruction byte stream for code comment >---
2818 if (compressed_format_idx > 1) {
2819 st->cr(); // interrupt byte stream
2820 st->cr(); // add an empty line
2821 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false);
2822 }
2823 const_cast<nmethod*>(this)->print_code_comment_on(st, code_comment_column, p, p_end );
2824 st->bol();
2825 compressed_format_idx = 0;
2826 }
2827
2828 //---< New location information after line break >---
2829 if (compressed_format_idx == 0) {
2830 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false);
2831 compressed_format_idx = 1;
2832 }
2833
2834 //---< Nicely align instructions for readability >---
2835 if (compressed_format_idx > 1) {
2836 Disassembler::print_delimiter(st);
2837 }
2838
2839 //---< Now, finally, print the actual instruction bytes >---
2840 unsigned char* p0 = p;
2841 p = Disassembler::decode_instruction_abstract(p, st, instruction_size_in_bytes, instr_maxlen);
2842 compressed_format_idx += (int)(p - p0);
2843
2844 if (Disassembler::start_newline(compressed_format_idx-1)) {
2845 st->cr();
2846 compressed_format_idx = 0;
2847 }
2848 }
2849 //---< Close the output (Marker for post-mortem disassembler) >---
2850 st->bol();
2851 st->print_cr("[/MachCode]");
2852 return;
2853 }
2854 #endif
2855 }
2856
2857 #if defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_ABSTRACT_ASSEMBLY)
2858
2859 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
2860 RelocIterator iter(this, begin, end);
2861 bool have_one = false;
2862 while (iter.next()) {
2863 have_one = true;
2864 switch (iter.type()) {
2865 case relocInfo::none: return "no_reloc";
2866 case relocInfo::oop_type: {
2867 // Get a non-resizable resource-allocated stringStream.
2868 // Our callees make use of (nested) ResourceMarks.
2869 stringStream st(NEW_RESOURCE_ARRAY(char, 1024), 1024);
2870 oop_Relocation* r = iter.oop_reloc();
2871 oop obj = r->oop_value();
2872 st.print("oop(");
2873 if (obj == nullptr) st.print("nullptr");
2874 else obj->print_value_on(&st);
2875 st.print(")");
2876 return st.as_string();
2877 }
2878 case relocInfo::metadata_type: {
2879 stringStream st;
2880 metadata_Relocation* r = iter.metadata_reloc();
2881 Metadata* obj = r->metadata_value();
2882 st.print("metadata(");
2883 if (obj == nullptr) st.print("nullptr");
2884 else obj->print_value_on(&st);
2885 st.print(")");
2886 return st.as_string();
2887 }
2888 case relocInfo::runtime_call_type:
2889 case relocInfo::runtime_call_w_cp_type: {
2890 stringStream st;
2891 st.print("runtime_call");
2892 CallRelocation* r = (CallRelocation*)iter.reloc();
2893 address dest = r->destination();
2894 CodeBlob* cb = CodeCache::find_blob(dest);
2895 if (cb != nullptr) {
2896 st.print(" %s", cb->name());
2897 } else {
2898 ResourceMark rm;
2899 const int buflen = 1024;
2900 char* buf = NEW_RESOURCE_ARRAY(char, buflen);
2901 int offset;
2902 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) {
2903 st.print(" %s", buf);
2904 if (offset != 0) {
2905 st.print("+%d", offset);
2906 }
2907 }
2908 }
2909 return st.as_string();
2910 }
2911 case relocInfo::virtual_call_type: {
2912 stringStream st;
2913 st.print_raw("virtual_call");
2914 virtual_call_Relocation* r = iter.virtual_call_reloc();
2915 Method* m = r->method_value();
2916 if (m != nullptr) {
2917 assert(m->is_method(), "");
2918 m->print_short_name(&st);
2919 }
2920 return st.as_string();
2921 }
2922 case relocInfo::opt_virtual_call_type: {
2923 stringStream st;
2924 st.print_raw("optimized virtual_call");
2925 opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc();
2926 Method* m = r->method_value();
2927 if (m != nullptr) {
2928 assert(m->is_method(), "");
2929 m->print_short_name(&st);
2930 }
2931 return st.as_string();
2932 }
2933 case relocInfo::static_call_type: {
2934 stringStream st;
2935 st.print_raw("static_call");
2936 static_call_Relocation* r = iter.static_call_reloc();
2937 Method* m = r->method_value();
2938 if (m != nullptr) {
2939 assert(m->is_method(), "");
2940 m->print_short_name(&st);
2941 }
2942 return st.as_string();
2943 }
2944 case relocInfo::static_stub_type: return "static_stub";
2945 case relocInfo::external_word_type: return "external_word";
2946 case relocInfo::internal_word_type: return "internal_word";
2947 case relocInfo::section_word_type: return "section_word";
2948 case relocInfo::poll_type: return "poll";
2949 case relocInfo::poll_return_type: return "poll_return";
2950 case relocInfo::trampoline_stub_type: return "trampoline_stub";
2951 case relocInfo::type_mask: return "type_bit_mask";
2952
2953 default:
2954 break;
2955 }
2956 }
2957 return have_one ? "other" : nullptr;
2958 }
2959
2960 // Return the last scope in (begin..end]
2961 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
2962 PcDesc* p = pc_desc_near(begin+1);
2963 if (p != nullptr && p->real_pc(this) <= end) {
2964 return new ScopeDesc(this, p);
2965 }
2966 return nullptr;
2967 }
2968
2969 const char* nmethod::nmethod_section_label(address pos) const {
2970 const char* label = nullptr;
2971 if (pos == code_begin()) label = "[Instructions begin]";
2972 if (pos == entry_point()) label = "[Entry Point]";
2973 if (pos == verified_entry_point()) label = "[Verified Entry Point]";
2974 if (has_method_handle_invokes() && (pos == deopt_mh_handler_begin())) label = "[Deopt MH Handler Code]";
2975 if (pos == consts_begin() && pos != insts_begin()) label = "[Constants]";
2976 // Check stub_code before checking exception_handler or deopt_handler.
2977 if (pos == this->stub_begin()) label = "[Stub Code]";
2978 if (JVMCI_ONLY(_exception_offset >= 0 &&) pos == exception_begin()) label = "[Exception Handler]";
2979 if (JVMCI_ONLY(_deopt_handler_begin != nullptr &&) pos == deopt_handler_begin()) label = "[Deopt Handler Code]";
2980 return label;
2981 }
2982
2983 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin, bool print_section_labels) const {
2984 if (print_section_labels) {
2985 const char* label = nmethod_section_label(block_begin);
2986 if (label != nullptr) {
2987 stream->bol();
2988 stream->print_cr("%s", label);
2989 }
2990 }
2991
2992 if (block_begin == entry_point()) {
2993 Method* m = method();
2994 if (m != nullptr) {
2995 stream->print(" # ");
2996 m->print_value_on(stream);
2997 stream->cr();
2998 }
2999 if (m != nullptr && !is_osr_method()) {
3000 ResourceMark rm;
3001 int sizeargs = m->size_of_parameters();
3002 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
3003 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
3004 {
3005 int sig_index = 0;
3006 if (!m->is_static())
3007 sig_bt[sig_index++] = T_OBJECT; // 'this'
3008 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) {
3009 BasicType t = ss.type();
3010 sig_bt[sig_index++] = t;
3011 if (type2size[t] == 2) {
3012 sig_bt[sig_index++] = T_VOID;
3013 } else {
3014 assert(type2size[t] == 1, "size is 1 or 2");
3015 }
3016 }
3017 assert(sig_index == sizeargs, "");
3018 }
3019 const char* spname = "sp"; // make arch-specific?
3020 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs);
3021 int stack_slot_offset = this->frame_size() * wordSize;
3022 int tab1 = 14, tab2 = 24;
3023 int sig_index = 0;
3024 int arg_index = (m->is_static() ? 0 : -1);
3025 bool did_old_sp = false;
3026 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) {
3027 bool at_this = (arg_index == -1);
3028 bool at_old_sp = false;
3029 BasicType t = (at_this ? T_OBJECT : ss.type());
3030 assert(t == sig_bt[sig_index], "sigs in sync");
3031 if (at_this)
3032 stream->print(" # this: ");
3033 else
3034 stream->print(" # parm%d: ", arg_index);
3035 stream->move_to(tab1);
3036 VMReg fst = regs[sig_index].first();
3037 VMReg snd = regs[sig_index].second();
3038 if (fst->is_reg()) {
3039 stream->print("%s", fst->name());
3040 if (snd->is_valid()) {
3041 stream->print(":%s", snd->name());
3042 }
3043 } else if (fst->is_stack()) {
3044 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
3045 if (offset == stack_slot_offset) at_old_sp = true;
3046 stream->print("[%s+0x%x]", spname, offset);
3047 } else {
3048 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
3049 }
3050 stream->print(" ");
3051 stream->move_to(tab2);
3052 stream->print("= ");
3053 if (at_this) {
3054 m->method_holder()->print_value_on(stream);
3055 } else {
3056 bool did_name = false;
3057 if (!at_this && ss.is_reference()) {
3058 Symbol* name = ss.as_symbol();
3059 name->print_value_on(stream);
3060 did_name = true;
3061 }
3062 if (!did_name)
3063 stream->print("%s", type2name(t));
3064 }
3065 if (at_old_sp) {
3066 stream->print(" (%s of caller)", spname);
3067 did_old_sp = true;
3068 }
3069 stream->cr();
3070 sig_index += type2size[t];
3071 arg_index += 1;
3072 if (!at_this) ss.next();
3073 }
3074 if (!did_old_sp) {
3075 stream->print(" # ");
3076 stream->move_to(tab1);
3077 stream->print("[%s+0x%x]", spname, stack_slot_offset);
3078 stream->print(" (%s of caller)", spname);
3079 stream->cr();
3080 }
3081 }
3082 }
3083 }
3084
3085 // Returns whether this nmethod has code comments.
3086 bool nmethod::has_code_comment(address begin, address end) {
3087 // scopes?
3088 ScopeDesc* sd = scope_desc_in(begin, end);
3089 if (sd != nullptr) return true;
3090
3091 // relocations?
3092 const char* str = reloc_string_for(begin, end);
3093 if (str != nullptr) return true;
3094
3095 // implicit exceptions?
3096 int cont_offset = ImplicitExceptionTable(this).continuation_offset((uint)(begin - code_begin()));
3097 if (cont_offset != 0) return true;
3098
3099 return false;
3100 }
3101
3102 void nmethod::print_code_comment_on(outputStream* st, int column, address begin, address end) {
3103 ImplicitExceptionTable implicit_table(this);
3104 int pc_offset = (int)(begin - code_begin());
3105 int cont_offset = implicit_table.continuation_offset(pc_offset);
3106 bool oop_map_required = false;
3107 if (cont_offset != 0) {
3108 st->move_to(column, 6, 0);
3109 if (pc_offset == cont_offset) {
3110 st->print("; implicit exception: deoptimizes");
3111 oop_map_required = true;
3112 } else {
3113 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset));
3114 }
3115 }
3116
3117 // Find an oopmap in (begin, end]. We use the odd half-closed
3118 // interval so that oop maps and scope descs which are tied to the
3119 // byte after a call are printed with the call itself. OopMaps
3120 // associated with implicit exceptions are printed with the implicit
3121 // instruction.
3122 address base = code_begin();
3123 ImmutableOopMapSet* oms = oop_maps();
3124 if (oms != nullptr) {
3125 for (int i = 0, imax = oms->count(); i < imax; i++) {
3126 const ImmutableOopMapPair* pair = oms->pair_at(i);
3127 const ImmutableOopMap* om = pair->get_from(oms);
3128 address pc = base + pair->pc_offset();
3129 if (pc >= begin) {
3130 #if INCLUDE_JVMCI
3131 bool is_implicit_deopt = implicit_table.continuation_offset(pair->pc_offset()) == (uint) pair->pc_offset();
3132 #else
3133 bool is_implicit_deopt = false;
3134 #endif
3135 if (is_implicit_deopt ? pc == begin : pc > begin && pc <= end) {
3136 st->move_to(column, 6, 0);
3137 st->print("; ");
3138 om->print_on(st);
3139 oop_map_required = false;
3140 }
3141 }
3142 if (pc > end) {
3143 break;
3144 }
3145 }
3146 }
3147 assert(!oop_map_required, "missed oopmap");
3148
3149 Thread* thread = Thread::current();
3150
3151 // Print any debug info present at this pc.
3152 ScopeDesc* sd = scope_desc_in(begin, end);
3153 if (sd != nullptr) {
3154 st->move_to(column, 6, 0);
3155 if (sd->bci() == SynchronizationEntryBCI) {
3156 st->print(";*synchronization entry");
3157 } else if (sd->bci() == AfterBci) {
3158 st->print(";* method exit (unlocked if synchronized)");
3159 } else if (sd->bci() == UnwindBci) {
3160 st->print(";* unwind (locked if synchronized)");
3161 } else if (sd->bci() == AfterExceptionBci) {
3162 st->print(";* unwind (unlocked if synchronized)");
3163 } else if (sd->bci() == UnknownBci) {
3164 st->print(";* unknown");
3165 } else if (sd->bci() == InvalidFrameStateBci) {
3166 st->print(";* invalid frame state");
3167 } else {
3168 if (sd->method() == nullptr) {
3169 st->print("method is nullptr");
3170 } else if (sd->method()->is_native()) {
3171 st->print("method is native");
3172 } else {
3173 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci());
3174 st->print(";*%s", Bytecodes::name(bc));
3175 switch (bc) {
3176 case Bytecodes::_invokevirtual:
3177 case Bytecodes::_invokespecial:
3178 case Bytecodes::_invokestatic:
3179 case Bytecodes::_invokeinterface:
3180 {
3181 Bytecode_invoke invoke(methodHandle(thread, sd->method()), sd->bci());
3182 st->print(" ");
3183 if (invoke.name() != nullptr)
3184 invoke.name()->print_symbol_on(st);
3185 else
3186 st->print("<UNKNOWN>");
3187 break;
3188 }
3189 case Bytecodes::_getfield:
3190 case Bytecodes::_putfield:
3191 case Bytecodes::_getstatic:
3192 case Bytecodes::_putstatic:
3193 {
3194 Bytecode_field field(methodHandle(thread, sd->method()), sd->bci());
3195 st->print(" ");
3196 if (field.name() != nullptr)
3197 field.name()->print_symbol_on(st);
3198 else
3199 st->print("<UNKNOWN>");
3200 }
3201 default:
3202 break;
3203 }
3204 }
3205 st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop());
3206 }
3207
3208 // Print all scopes
3209 for (;sd != nullptr; sd = sd->sender()) {
3210 st->move_to(column, 6, 0);
3211 st->print("; -");
3212 if (sd->should_reexecute()) {
3213 st->print(" (reexecute)");
3214 }
3215 if (sd->method() == nullptr) {
3216 st->print("method is nullptr");
3217 } else {
3218 sd->method()->print_short_name(st);
3219 }
3220 int lineno = sd->method()->line_number_from_bci(sd->bci());
3221 if (lineno != -1) {
3222 st->print("@%d (line %d)", sd->bci(), lineno);
3223 } else {
3224 st->print("@%d", sd->bci());
3225 }
3226 st->cr();
3227 }
3228 }
3229
3230 // Print relocation information
3231 // Prevent memory leak: allocating without ResourceMark.
3232 ResourceMark rm;
3233 const char* str = reloc_string_for(begin, end);
3234 if (str != nullptr) {
3235 if (sd != nullptr) st->cr();
3236 st->move_to(column, 6, 0);
3237 st->print("; {%s}", str);
3238 }
3239 }
3240
3241 #endif
3242
3243 class DirectNativeCallWrapper: public NativeCallWrapper {
3244 private:
3245 NativeCall* _call;
3246
3247 public:
3248 DirectNativeCallWrapper(NativeCall* call) : _call(call) {}
3249
3250 virtual address destination() const { return _call->destination(); }
3251 virtual address instruction_address() const { return _call->instruction_address(); }
3252 virtual address next_instruction_address() const { return _call->next_instruction_address(); }
3253 virtual address return_address() const { return _call->return_address(); }
3254
3255 virtual address get_resolve_call_stub(bool is_optimized) const {
3256 if (is_optimized) {
3257 return SharedRuntime::get_resolve_opt_virtual_call_stub();
3258 }
3259 return SharedRuntime::get_resolve_virtual_call_stub();
3260 }
3261
3262 virtual void set_destination_mt_safe(address dest) {
3263 _call->set_destination_mt_safe(dest);
3264 }
3265
3266 virtual void set_to_interpreted(const methodHandle& method, CompiledICInfo& info) {
3267 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address());
3268 {
3269 csc->set_to_interpreted(method, info.entry());
3270 }
3271 }
3272
3273 virtual void verify() const {
3274 // make sure code pattern is actually a call imm32 instruction
3275 _call->verify();
3276 _call->verify_alignment();
3277 }
3278
3279 virtual void verify_resolve_call(address dest) const {
3280 CodeBlob* db = CodeCache::find_blob(dest);
3281 assert(db != nullptr && !db->is_adapter_blob(), "must use stub!");
3282 }
3283
3284 virtual bool is_call_to_interpreted(address dest) const {
3285 CodeBlob* cb = CodeCache::find_blob(_call->instruction_address());
3286 return cb->contains(dest);
3287 }
3288
3289 virtual bool is_safe_for_patching() const { return false; }
3290
3291 virtual NativeInstruction* get_load_instruction(virtual_call_Relocation* r) const {
3292 return nativeMovConstReg_at(r->cached_value());
3293 }
3294
3295 virtual void *get_data(NativeInstruction* instruction) const {
3296 return (void*)((NativeMovConstReg*) instruction)->data();
3297 }
3298
3299 virtual void set_data(NativeInstruction* instruction, intptr_t data) {
3300 ((NativeMovConstReg*) instruction)->set_data(data);
3301 }
3302 };
3303
3304 NativeCallWrapper* nmethod::call_wrapper_at(address call) const {
3305 return new DirectNativeCallWrapper((NativeCall*) call);
3306 }
3307
3308 NativeCallWrapper* nmethod::call_wrapper_before(address return_pc) const {
3309 return new DirectNativeCallWrapper(nativeCall_before(return_pc));
3310 }
3311
3312 address nmethod::call_instruction_address(address pc) const {
3313 if (NativeCall::is_call_before(pc)) {
3314 NativeCall *ncall = nativeCall_before(pc);
3315 return ncall->instruction_address();
3316 }
3317 return nullptr;
3318 }
3319
3320 CompiledStaticCall* nmethod::compiledStaticCall_at(Relocation* call_site) const {
3321 return CompiledDirectStaticCall::at(call_site);
3322 }
3323
3324 CompiledStaticCall* nmethod::compiledStaticCall_at(address call_site) const {
3325 return CompiledDirectStaticCall::at(call_site);
3326 }
3327
3328 CompiledStaticCall* nmethod::compiledStaticCall_before(address return_addr) const {
3329 return CompiledDirectStaticCall::before(return_addr);
3330 }
3331
3332 #if defined(SUPPORT_DATA_STRUCTS)
3333 void nmethod::print_value_on(outputStream* st) const {
3334 st->print("nmethod");
3335 print_on(st, nullptr);
3336 }
3337 #endif
3338
3339 #ifndef PRODUCT
3340
3341 void nmethod::print_calls(outputStream* st) {
3342 RelocIterator iter(this);
3343 while (iter.next()) {
3344 switch (iter.type()) {
3345 case relocInfo::virtual_call_type:
3346 case relocInfo::opt_virtual_call_type: {
3347 CompiledICLocker ml_verify(this);
3348 CompiledIC_at(&iter)->print();
3349 break;
3350 }
3351 case relocInfo::static_call_type:
3352 st->print_cr("Static call at " INTPTR_FORMAT, p2i(iter.reloc()->addr()));
3353 CompiledDirectStaticCall::at(iter.reloc())->print();
3354 break;
3355 default:
3356 break;
3357 }
3358 }
3359 }
3360
3361 void nmethod::print_statistics() {
3362 ttyLocker ttyl;
3363 if (xtty != nullptr) xtty->head("statistics type='nmethod'");
3364 native_nmethod_stats.print_native_nmethod_stats();
3365 #ifdef COMPILER1
3366 c1_java_nmethod_stats.print_nmethod_stats("C1");
3367 #endif
3368 #ifdef COMPILER2
3369 c2_java_nmethod_stats.print_nmethod_stats("C2");
3370 #endif
3371 #if INCLUDE_JVMCI
3372 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI");
3373 #endif
3374 unknown_java_nmethod_stats.print_nmethod_stats("Unknown");
3375 DebugInformationRecorder::print_statistics();
3376 #ifndef PRODUCT
3377 pc_nmethod_stats.print_pc_stats();
3378 #endif
3379 Dependencies::print_statistics();
3380 if (xtty != nullptr) xtty->tail("statistics");
3381 }
3382
3383 #endif // !PRODUCT
3384
3385 #if INCLUDE_JVMCI
3386 void nmethod::update_speculation(JavaThread* thread) {
3387 jlong speculation = thread->pending_failed_speculation();
3388 if (speculation != 0) {
3389 guarantee(jvmci_nmethod_data() != nullptr, "failed speculation in nmethod without failed speculation list");
3390 jvmci_nmethod_data()->add_failed_speculation(this, speculation);
3391 thread->set_pending_failed_speculation(0);
3392 }
3393 }
3394
3395 const char* nmethod::jvmci_name() {
3396 if (jvmci_nmethod_data() != nullptr) {
3397 return jvmci_nmethod_data()->name();
3398 }
3399 return nullptr;
3400 }
3401 #endif