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