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