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 "jvm.h"
27 #include "asm/assembler.inline.hpp"
28 #include "code/codeCache.hpp"
29 #include "code/compiledIC.hpp"
30 #include "code/compiledMethod.inline.hpp"
31 #include "code/dependencies.hpp"
32 #include "code/nativeInst.hpp"
33 #include "code/nmethod.hpp"
34 #include "code/scopeDesc.hpp"
35 #include "compiler/abstractCompiler.hpp"
36 #include "compiler/compilationLog.hpp"
37 #include "compiler/compileBroker.hpp"
38 #include "compiler/compileLog.hpp"
39 #include "compiler/compileTask.hpp"
40 #include "compiler/compilerDirectives.hpp"
41 #include "compiler/directivesParser.hpp"
42 #include "compiler/disassembler.hpp"
43 #include "compiler/oopMap.inline.hpp"
44 #include "gc/shared/barrierSet.hpp"
45 #include "gc/shared/barrierSetNMethod.hpp"
46 #include "gc/shared/collectedHeap.hpp"
47 #include "interpreter/bytecode.hpp"
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 nmethod* nmethod::new_native_nmethod(const methodHandle& method,
455 int compile_id,
456 CodeBuffer *code_buffer,
457 int vep_offset,
458 int frame_complete,
459 int frame_size,
460 ByteSize basic_lock_owner_sp_offset,
461 ByteSize basic_lock_sp_offset,
462 OopMapSet* oop_maps,
463 int exception_handler) {
464 code_buffer->finalize_oop_references(method);
465 // create nmethod
466 nmethod* nm = NULL;
467 int native_nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod));
468 {
469 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
470
471 CodeOffsets offsets;
472 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
473 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
474 if (exception_handler != -1) {
475 offsets.set_value(CodeOffsets::Exceptions, exception_handler);
476 }
477 nm = new (native_nmethod_size, CompLevel_none)
478 nmethod(method(), compiler_none, native_nmethod_size,
479 compile_id, &offsets,
480 code_buffer, frame_size,
481 basic_lock_owner_sp_offset,
482 basic_lock_sp_offset,
483 oop_maps);
484 NOT_PRODUCT(if (nm != NULL) native_nmethod_stats.note_native_nmethod(nm));
485 }
486
487 if (nm != NULL) {
488 // verify nmethod
489 debug_only(nm->verify();) // might block
490
491 nm->log_new_nmethod();
492 }
493 return nm;
494 }
495
496 nmethod* nmethod::new_nmethod(const methodHandle& method,
497 int compile_id,
498 int entry_bci,
499 CodeOffsets* offsets,
500 int orig_pc_offset,
501 DebugInformationRecorder* debug_info,
502 Dependencies* dependencies,
503 CodeBuffer* code_buffer, int frame_size,
504 OopMapSet* oop_maps,
505 ExceptionHandlerTable* handler_table,
506 ImplicitExceptionTable* nul_chk_table,
507 AbstractCompiler* compiler,
508 CompLevel comp_level
509 #if INCLUDE_JVMCI
510 , char* speculations,
511 int speculations_len,
512 int nmethod_mirror_index,
513 const char* nmethod_mirror_name,
514 FailedSpeculation** failed_speculations
515 #endif
516 )
517 {
518 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
519 code_buffer->finalize_oop_references(method);
520 // create nmethod
521 nmethod* nm = NULL;
522 #if INCLUDE_JVMCI
523 int jvmci_data_size = !compiler->is_jvmci() ? 0 : JVMCINMethodData::compute_size(nmethod_mirror_name);
524 #endif
525 int nmethod_size =
526 CodeBlob::allocation_size(code_buffer, sizeof(nmethod))
527 + adjust_pcs_size(debug_info->pcs_size())
528 + align_up((int)dependencies->size_in_bytes(), oopSize)
529 + align_up(handler_table->size_in_bytes() , oopSize)
530 + align_up(nul_chk_table->size_in_bytes() , oopSize)
531 #if INCLUDE_JVMCI
532 + align_up(speculations_len , oopSize)
533 + align_up(jvmci_data_size , oopSize)
534 #endif
535 + align_up(debug_info->data_size() , oopSize);
536 {
537 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
538
539 nm = new (nmethod_size, comp_level)
540 nmethod(method(), compiler->type(), nmethod_size, compile_id, entry_bci, offsets,
541 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size,
542 oop_maps,
543 handler_table,
544 nul_chk_table,
545 compiler,
546 comp_level
547 #if INCLUDE_JVMCI
548 , speculations,
549 speculations_len,
550 jvmci_data_size
551 #endif
552 );
553
554 if (nm != NULL) {
555 #if INCLUDE_JVMCI
556 if (compiler->is_jvmci()) {
557 // Initialize the JVMCINMethodData object inlined into nm
558 nm->jvmci_nmethod_data()->initialize(nmethod_mirror_index, nmethod_mirror_name, failed_speculations);
559 }
560 #endif
561 // To make dependency checking during class loading fast, record
562 // the nmethod dependencies in the classes it is dependent on.
563 // This allows the dependency checking code to simply walk the
564 // class hierarchy above the loaded class, checking only nmethods
565 // which are dependent on those classes. The slow way is to
566 // check every nmethod for dependencies which makes it linear in
567 // the number of methods compiled. For applications with a lot
568 // classes the slow way is too slow.
569 for (Dependencies::DepStream deps(nm); deps.next(); ) {
570 if (deps.type() == Dependencies::call_site_target_value) {
571 // CallSite dependencies are managed on per-CallSite instance basis.
572 oop call_site = deps.argument_oop(0);
573 MethodHandles::add_dependent_nmethod(call_site, nm);
574 } else {
575 Klass* klass = deps.context_type();
576 if (klass == NULL) {
577 continue; // ignore things like evol_method
578 }
579 // record this nmethod as dependent on this klass
580 InstanceKlass::cast(klass)->add_dependent_nmethod(nm);
581 }
582 }
583 NOT_PRODUCT(if (nm != NULL) note_java_nmethod(nm));
584 }
585 }
586 // Do verification and logging outside CodeCache_lock.
587 if (nm != NULL) {
588 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
589 DEBUG_ONLY(nm->verify();)
590 nm->log_new_nmethod();
591 }
592 return nm;
593 }
594
595 // For native wrappers
596 nmethod::nmethod(
597 Method* method,
598 CompilerType type,
599 int nmethod_size,
600 int compile_id,
601 CodeOffsets* offsets,
602 CodeBuffer* code_buffer,
603 int frame_size,
604 ByteSize basic_lock_owner_sp_offset,
605 ByteSize basic_lock_sp_offset,
606 OopMapSet* oop_maps )
607 : CompiledMethod(method, "native nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false, true),
608 _unlinked_next(NULL),
609 _native_receiver_sp_offset(basic_lock_owner_sp_offset),
610 _native_basic_lock_sp_offset(basic_lock_sp_offset),
611 _is_unloading_state(0)
612 {
613 {
614 int scopes_data_offset = 0;
615 int deoptimize_offset = 0;
616 int deoptimize_mh_offset = 0;
617
618 debug_only(NoSafepointVerifier nsv;)
619 assert_locked_or_safepoint(CodeCache_lock);
620
621 init_defaults();
622 _comp_level = CompLevel_none;
623 _entry_bci = InvocationEntryBci;
624 // We have no exception handler or deopt handler make the
625 // values something that will never match a pc like the nmethod vtable entry
626 _exception_offset = 0;
627 _orig_pc_offset = 0;
628 _gc_epoch = CodeCache::gc_epoch();
629
630 _consts_offset = data_offset();
631 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs());
632 _oops_offset = data_offset();
633 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize);
634 scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize);
635 _scopes_pcs_offset = scopes_data_offset;
636 _dependencies_offset = _scopes_pcs_offset;
637 _handler_table_offset = _dependencies_offset;
638 _nul_chk_table_offset = _handler_table_offset;
639 #if INCLUDE_JVMCI
640 _speculations_offset = _nul_chk_table_offset;
641 _jvmci_data_offset = _speculations_offset;
642 _nmethod_end_offset = _jvmci_data_offset;
643 #else
644 _nmethod_end_offset = _nul_chk_table_offset;
645 #endif
646 _compile_id = compile_id;
647 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
648 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
649
650 assert(!method->has_scalarized_args(), "scalarized native wrappers not supported yet"); // for the next 3 fields
651 _inline_entry_point = _entry_point;
652 _verified_inline_entry_point = _verified_entry_point;
653 _verified_inline_ro_entry_point = _verified_entry_point;
654
655 _osr_entry_point = NULL;
656 _exception_cache = NULL;
657 _pc_desc_container.reset_to(NULL);
658
659 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions);
660
661 _scopes_data_begin = (address) this + scopes_data_offset;
662 _deopt_handler_begin = (address) this + deoptimize_offset;
663 _deopt_mh_handler_begin = (address) this + deoptimize_mh_offset;
664
665 code_buffer->copy_code_and_locs_to(this);
666 code_buffer->copy_values_to(this);
667
668 clear_unloading_state();
669
670 Universe::heap()->register_nmethod(this);
671 debug_only(Universe::heap()->verify_nmethod(this));
672
673 CodeCache::commit(this);
674
675 finalize_relocations();
676 }
677
678 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
679 ttyLocker ttyl; // keep the following output all in one block
680 // This output goes directly to the tty, not the compiler log.
681 // To enable tools to match it up with the compilation activity,
682 // be sure to tag this tty output with the compile ID.
683 if (xtty != NULL) {
684 xtty->begin_head("print_native_nmethod");
685 xtty->method(_method);
686 xtty->stamp();
687 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
688 }
689 // Print the header part, then print the requested information.
690 // This is both handled in decode2(), called via print_code() -> decode()
691 if (PrintNativeNMethods) {
692 tty->print_cr("-------------------------- Assembly (native nmethod) ---------------------------");
693 print_code();
694 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
695 #if defined(SUPPORT_DATA_STRUCTS)
696 if (AbstractDisassembler::show_structs()) {
697 if (oop_maps != NULL) {
698 tty->print("oop maps:"); // oop_maps->print_on(tty) outputs a cr() at the beginning
699 oop_maps->print_on(tty);
700 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
701 }
702 }
703 #endif
704 } else {
705 print(); // print the header part only.
706 }
707 #if defined(SUPPORT_DATA_STRUCTS)
708 if (AbstractDisassembler::show_structs()) {
709 if (PrintRelocations) {
710 print_relocations();
711 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
712 }
713 }
714 #endif
715 if (xtty != NULL) {
716 xtty->tail("print_native_nmethod");
717 }
718 }
719 }
720
721 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () {
722 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level));
723 }
724
725 nmethod::nmethod(
726 Method* method,
727 CompilerType type,
728 int nmethod_size,
729 int compile_id,
730 int entry_bci,
731 CodeOffsets* offsets,
732 int orig_pc_offset,
733 DebugInformationRecorder* debug_info,
734 Dependencies* dependencies,
735 CodeBuffer *code_buffer,
736 int frame_size,
737 OopMapSet* oop_maps,
738 ExceptionHandlerTable* handler_table,
739 ImplicitExceptionTable* nul_chk_table,
740 AbstractCompiler* compiler,
741 CompLevel comp_level
742 #if INCLUDE_JVMCI
743 , char* speculations,
744 int speculations_len,
745 int jvmci_data_size
746 #endif
747 )
748 : CompiledMethod(method, "nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false, true),
749 _unlinked_next(NULL),
750 _native_receiver_sp_offset(in_ByteSize(-1)),
751 _native_basic_lock_sp_offset(in_ByteSize(-1)),
752 _is_unloading_state(0)
753 {
754 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
755 {
756 debug_only(NoSafepointVerifier nsv;)
757 assert_locked_or_safepoint(CodeCache_lock);
758
759 _deopt_handler_begin = (address) this;
760 _deopt_mh_handler_begin = (address) this;
761
762 init_defaults();
763 _entry_bci = entry_bci;
764 _compile_id = compile_id;
765 _comp_level = comp_level;
766 _orig_pc_offset = orig_pc_offset;
767 _gc_epoch = CodeCache::gc_epoch();
768
769 // Section offsets
770 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts());
771 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs());
772 set_ctable_begin(header_begin() + _consts_offset);
773
774 #if INCLUDE_JVMCI
775 if (compiler->is_jvmci()) {
776 // JVMCI might not produce any stub sections
777 if (offsets->value(CodeOffsets::Exceptions) != -1) {
778 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions);
779 } else {
780 _exception_offset = -1;
781 }
782 if (offsets->value(CodeOffsets::Deopt) != -1) {
783 _deopt_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::Deopt);
784 } else {
785 _deopt_handler_begin = NULL;
786 }
787 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
788 _deopt_mh_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::DeoptMH);
789 } else {
790 _deopt_mh_handler_begin = NULL;
791 }
792 } else
793 #endif
794 {
795 // Exception handler and deopt handler are in the stub section
796 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set");
797 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set");
798
799 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
800 _deopt_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::Deopt);
801 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
802 _deopt_mh_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::DeoptMH);
803 } else {
804 _deopt_mh_handler_begin = NULL;
805 }
806 }
807 if (offsets->value(CodeOffsets::UnwindHandler) != -1) {
808 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler);
809 } else {
810 _unwind_handler_offset = -1;
811 }
812
813 _oops_offset = data_offset();
814 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize);
815 int scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize);
816
817 _scopes_pcs_offset = scopes_data_offset + align_up(debug_info->data_size (), oopSize);
818 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
819 _handler_table_offset = _dependencies_offset + align_up((int)dependencies->size_in_bytes(), oopSize);
820 _nul_chk_table_offset = _handler_table_offset + align_up(handler_table->size_in_bytes(), oopSize);
821 #if INCLUDE_JVMCI
822 _speculations_offset = _nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize);
823 _jvmci_data_offset = _speculations_offset + align_up(speculations_len, oopSize);
824 _nmethod_end_offset = _jvmci_data_offset + align_up(jvmci_data_size, oopSize);
825 #else
826 _nmethod_end_offset = _nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize);
827 #endif
828 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
829 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
830 _inline_entry_point = code_begin() + offsets->value(CodeOffsets::Inline_Entry);
831 _verified_inline_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Inline_Entry);
832 _verified_inline_ro_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Inline_Entry_RO);
833 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry);
834 _exception_cache = NULL;
835 _scopes_data_begin = (address) this + scopes_data_offset;
836
837 _pc_desc_container.reset_to(scopes_pcs_begin());
838
839 code_buffer->copy_code_and_locs_to(this);
840 // Copy contents of ScopeDescRecorder to nmethod
841 code_buffer->copy_values_to(this);
842 debug_info->copy_to(this);
843 dependencies->copy_to(this);
844 clear_unloading_state();
845
846 Universe::heap()->register_nmethod(this);
847 debug_only(Universe::heap()->verify_nmethod(this));
848
849 CodeCache::commit(this);
850
851 finalize_relocations();
852
853 // Copy contents of ExceptionHandlerTable to nmethod
854 handler_table->copy_to(this);
855 nul_chk_table->copy_to(this);
856
857 #if INCLUDE_JVMCI
858 // Copy speculations to nmethod
859 if (speculations_size() != 0) {
860 memcpy(speculations_begin(), speculations, speculations_len);
861 }
862 #endif
863
864 // we use the information of entry points to find out if a method is
865 // static or non static
866 assert(compiler->is_c2() || compiler->is_jvmci() ||
867 _method->is_static() == (entry_point() == _verified_entry_point),
868 " entry points must be same for static methods and vice versa");
869 }
870 }
871
872 // Print a short set of xml attributes to identify this nmethod. The
873 // output should be embedded in some other element.
874 void nmethod::log_identity(xmlStream* log) const {
875 log->print(" compile_id='%d'", compile_id());
876 const char* nm_kind = compile_kind();
877 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind);
878 log->print(" compiler='%s'", compiler_name());
879 if (TieredCompilation) {
880 log->print(" level='%d'", comp_level());
881 }
882 #if INCLUDE_JVMCI
883 if (jvmci_nmethod_data() != NULL) {
884 const char* jvmci_name = jvmci_nmethod_data()->name();
885 if (jvmci_name != NULL) {
886 log->print(" jvmci_mirror_name='");
887 log->text("%s", jvmci_name);
888 log->print("'");
889 }
890 }
891 #endif
892 }
893
894
895 #define LOG_OFFSET(log, name) \
896 if (p2i(name##_end()) - p2i(name##_begin())) \
897 log->print(" " XSTR(name) "_offset='" INTX_FORMAT "'" , \
898 p2i(name##_begin()) - p2i(this))
899
900
901 void nmethod::log_new_nmethod() const {
902 if (LogCompilation && xtty != NULL) {
903 ttyLocker ttyl;
904 xtty->begin_elem("nmethod");
905 log_identity(xtty);
906 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size());
907 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this));
908
909 LOG_OFFSET(xtty, relocation);
910 LOG_OFFSET(xtty, consts);
911 LOG_OFFSET(xtty, insts);
912 LOG_OFFSET(xtty, stub);
913 LOG_OFFSET(xtty, scopes_data);
914 LOG_OFFSET(xtty, scopes_pcs);
915 LOG_OFFSET(xtty, dependencies);
916 LOG_OFFSET(xtty, handler_table);
917 LOG_OFFSET(xtty, nul_chk_table);
918 LOG_OFFSET(xtty, oops);
919 LOG_OFFSET(xtty, metadata);
920
921 xtty->method(method());
922 xtty->stamp();
923 xtty->end_elem();
924 }
925 }
926
927 #undef LOG_OFFSET
928
929
930 // Print out more verbose output usually for a newly created nmethod.
931 void nmethod::print_on(outputStream* st, const char* msg) const {
932 if (st != NULL) {
933 ttyLocker ttyl;
934 if (WizardMode) {
935 CompileTask::print(st, this, msg, /*short_form:*/ true);
936 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this));
937 } else {
938 CompileTask::print(st, this, msg, /*short_form:*/ false);
939 }
940 }
941 }
942
943 void nmethod::maybe_print_nmethod(const DirectiveSet* directive) {
944 bool printnmethods = directive->PrintAssemblyOption || directive->PrintNMethodsOption;
945 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
946 print_nmethod(printnmethods);
947 }
948 }
949
950 void nmethod::print_nmethod(bool printmethod) {
951 ttyLocker ttyl; // keep the following output all in one block
952 if (xtty != NULL) {
953 xtty->begin_head("print_nmethod");
954 log_identity(xtty);
955 xtty->stamp();
956 xtty->end_head();
957 }
958 // Print the header part, then print the requested information.
959 // This is both handled in decode2().
960 if (printmethod) {
961 ResourceMark m;
962 if (is_compiled_by_c1()) {
963 tty->cr();
964 tty->print_cr("============================= C1-compiled nmethod ==============================");
965 }
966 if (is_compiled_by_jvmci()) {
967 tty->cr();
968 tty->print_cr("=========================== JVMCI-compiled nmethod =============================");
969 }
970 tty->print_cr("----------------------------------- Assembly -----------------------------------");
971 decode2(tty);
972 #if defined(SUPPORT_DATA_STRUCTS)
973 if (AbstractDisassembler::show_structs()) {
974 // Print the oops from the underlying CodeBlob as well.
975 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
976 print_oops(tty);
977 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
978 print_metadata(tty);
979 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
980 print_pcs();
981 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
982 if (oop_maps() != NULL) {
983 tty->print("oop maps:"); // oop_maps()->print_on(tty) outputs a cr() at the beginning
984 oop_maps()->print_on(tty);
985 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
986 }
987 }
988 #endif
989 } else {
990 print(); // print the header part only.
991 }
992
993 #if defined(SUPPORT_DATA_STRUCTS)
994 if (AbstractDisassembler::show_structs()) {
995 methodHandle mh(Thread::current(), _method);
996 if (printmethod || PrintDebugInfo || CompilerOracle::has_option(mh, CompileCommand::PrintDebugInfo)) {
997 print_scopes();
998 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
999 }
1000 if (printmethod || PrintRelocations || CompilerOracle::has_option(mh, CompileCommand::PrintRelocations)) {
1001 print_relocations();
1002 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1003 }
1004 if (printmethod || PrintDependencies || CompilerOracle::has_option(mh, CompileCommand::PrintDependencies)) {
1005 print_dependencies();
1006 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1007 }
1008 if (printmethod || PrintExceptionHandlers) {
1009 print_handler_table();
1010 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1011 print_nul_chk_table();
1012 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1013 }
1014
1015 if (printmethod) {
1016 print_recorded_oops();
1017 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1018 print_recorded_metadata();
1019 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1020 }
1021 }
1022 #endif
1023
1024 if (xtty != NULL) {
1025 xtty->tail("print_nmethod");
1026 }
1027 }
1028
1029
1030 // Promote one word from an assembly-time handle to a live embedded oop.
1031 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
1032 if (handle == NULL ||
1033 // As a special case, IC oops are initialized to 1 or -1.
1034 handle == (jobject) Universe::non_oop_word()) {
1035 *(void**)dest = handle;
1036 } else {
1037 *dest = JNIHandles::resolve_non_null(handle);
1038 }
1039 }
1040
1041
1042 // Have to have the same name because it's called by a template
1043 void nmethod::copy_values(GrowableArray<jobject>* array) {
1044 int length = array->length();
1045 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
1046 oop* dest = oops_begin();
1047 for (int index = 0 ; index < length; index++) {
1048 initialize_immediate_oop(&dest[index], array->at(index));
1049 }
1050
1051 // Now we can fix up all the oops in the code. We need to do this
1052 // in the code because the assembler uses jobjects as placeholders.
1053 // The code and relocations have already been initialized by the
1054 // CodeBlob constructor, so it is valid even at this early point to
1055 // iterate over relocations and patch the code.
1056 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true);
1057 }
1058
1059 void nmethod::copy_values(GrowableArray<Metadata*>* array) {
1060 int length = array->length();
1061 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough");
1062 Metadata** dest = metadata_begin();
1063 for (int index = 0 ; index < length; index++) {
1064 dest[index] = array->at(index);
1065 }
1066 }
1067
1068 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) {
1069 // re-patch all oop-bearing instructions, just in case some oops moved
1070 RelocIterator iter(this, begin, end);
1071 while (iter.next()) {
1072 if (iter.type() == relocInfo::oop_type) {
1073 oop_Relocation* reloc = iter.oop_reloc();
1074 if (initialize_immediates && reloc->oop_is_immediate()) {
1075 oop* dest = reloc->oop_addr();
1076 initialize_immediate_oop(dest, cast_from_oop<jobject>(*dest));
1077 }
1078 // Refresh the oop-related bits of this instruction.
1079 reloc->fix_oop_relocation();
1080 } else if (iter.type() == relocInfo::metadata_type) {
1081 metadata_Relocation* reloc = iter.metadata_reloc();
1082 reloc->fix_metadata_relocation();
1083 }
1084 }
1085 }
1086
1087 static void install_post_call_nop_displacement(nmethod* nm, address pc) {
1088 NativePostCallNop* nop = nativePostCallNop_at((address) pc);
1089 intptr_t cbaddr = (intptr_t) nm;
1090 intptr_t offset = ((intptr_t) pc) - cbaddr;
1091
1092 int oopmap_slot = nm->oop_maps()->find_slot_for_offset((intptr_t) pc - (intptr_t) nm->code_begin());
1093 if (oopmap_slot < 0) { // this can happen at asynchronous (non-safepoint) stackwalks
1094 log_debug(codecache)("failed to find oopmap for cb: " INTPTR_FORMAT " offset: %d", cbaddr, (int) offset);
1095 } else if (((oopmap_slot & 0xff) == oopmap_slot) && ((offset & 0xffffff) == offset)) {
1096 jint value = (oopmap_slot << 24) | (jint) offset;
1097 nop->patch(value);
1098 } else {
1099 log_debug(codecache)("failed to encode %d %d", oopmap_slot, (int) offset);
1100 }
1101 }
1102
1103 void nmethod::finalize_relocations() {
1104 NoSafepointVerifier nsv;
1105
1106 // Make sure that post call nops fill in nmethod offsets eagerly so
1107 // we don't have to race with deoptimization
1108 RelocIterator iter(this);
1109 while (iter.next()) {
1110 if (iter.type() == relocInfo::post_call_nop_type) {
1111 post_call_nop_Relocation* const reloc = iter.post_call_nop_reloc();
1112 address pc = reloc->addr();
1113 install_post_call_nop_displacement(this, pc);
1114 }
1115 }
1116 }
1117
1118 void nmethod::make_deoptimized() {
1119 if (!Continuations::enabled()) {
1120 return;
1121 }
1122
1123 assert(method() == NULL || can_be_deoptimized(), "");
1124
1125 CompiledICLocker ml(this);
1126 assert(CompiledICLocker::is_safe(this), "mt unsafe call");
1127 ResourceMark rm;
1128 RelocIterator iter(this, oops_reloc_begin());
1129
1130 while (iter.next()) {
1131
1132 switch (iter.type()) {
1133 case relocInfo::virtual_call_type:
1134 case relocInfo::opt_virtual_call_type: {
1135 CompiledIC *ic = CompiledIC_at(&iter);
1136 address pc = ic->end_of_call();
1137 NativePostCallNop* nop = nativePostCallNop_at(pc);
1138 if (nop != NULL) {
1139 nop->make_deopt();
1140 }
1141 assert(NativeDeoptInstruction::is_deopt_at(pc), "check");
1142 break;
1143 }
1144 case relocInfo::static_call_type: {
1145 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
1146 address pc = csc->end_of_call();
1147 NativePostCallNop* nop = nativePostCallNop_at(pc);
1148 //tty->print_cr(" - static pc %p", pc);
1149 if (nop != NULL) {
1150 nop->make_deopt();
1151 }
1152 // We can't assert here, there are some calls to stubs / runtime
1153 // that have reloc data and doesn't have a post call NOP.
1154 //assert(NativeDeoptInstruction::is_deopt_at(pc), "check");
1155 break;
1156 }
1157 default:
1158 break;
1159 }
1160 }
1161 // Don't deopt this again.
1162 mark_deoptimized();
1163 }
1164
1165 void nmethod::verify_clean_inline_caches() {
1166 assert(CompiledICLocker::is_safe(this), "mt unsafe call");
1167
1168 ResourceMark rm;
1169 RelocIterator iter(this, oops_reloc_begin());
1170 while(iter.next()) {
1171 switch(iter.type()) {
1172 case relocInfo::virtual_call_type:
1173 case relocInfo::opt_virtual_call_type: {
1174 CompiledIC *ic = CompiledIC_at(&iter);
1175 CodeBlob *cb = CodeCache::find_blob(ic->ic_destination());
1176 assert(cb != NULL, "destination not in CodeBlob?");
1177 nmethod* nm = cb->as_nmethod_or_null();
1178 if( nm != NULL ) {
1179 // Verify that inline caches pointing to bad nmethods are clean
1180 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1181 assert(ic->is_clean(), "IC should be clean");
1182 }
1183 }
1184 break;
1185 }
1186 case relocInfo::static_call_type: {
1187 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
1188 CodeBlob *cb = CodeCache::find_blob(csc->destination());
1189 assert(cb != NULL, "destination not in CodeBlob?");
1190 nmethod* nm = cb->as_nmethod_or_null();
1191 if( nm != NULL ) {
1192 // Verify that inline caches pointing to bad nmethods are clean
1193 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1194 assert(csc->is_clean(), "IC should be clean");
1195 }
1196 }
1197 break;
1198 }
1199 default:
1200 break;
1201 }
1202 }
1203 }
1204
1205 void nmethod::mark_as_maybe_on_stack() {
1206 Atomic::store(&_gc_epoch, CodeCache::gc_epoch());
1207 }
1208
1209 bool nmethod::is_maybe_on_stack() {
1210 // If the condition below is true, it means that the nmethod was found to
1211 // be alive the previous completed marking cycle.
1212 return Atomic::load(&_gc_epoch) >= CodeCache::previous_completed_gc_marking_cycle();
1213 }
1214
1215 void nmethod::inc_decompile_count() {
1216 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return;
1217 // Could be gated by ProfileTraps, but do not bother...
1218 Method* m = method();
1219 if (m == NULL) return;
1220 MethodData* mdo = m->method_data();
1221 if (mdo == NULL) return;
1222 // There is a benign race here. See comments in methodData.hpp.
1223 mdo->inc_decompile_count();
1224 }
1225
1226 bool nmethod::try_transition(int new_state_int) {
1227 signed char new_state = new_state_int;
1228 assert_lock_strong(CompiledMethod_lock);
1229 signed char old_state = _state;
1230 if (old_state >= new_state) {
1231 // Ensure monotonicity of transitions.
1232 return false;
1233 }
1234 Atomic::store(&_state, new_state);
1235 return true;
1236 }
1237
1238 void nmethod::invalidate_osr_method() {
1239 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
1240 // Remove from list of active nmethods
1241 if (method() != NULL) {
1242 method()->method_holder()->remove_osr_nmethod(this);
1243 }
1244 }
1245
1246 void nmethod::log_state_change() const {
1247 if (LogCompilation) {
1248 if (xtty != NULL) {
1249 ttyLocker ttyl; // keep the following output all in one block
1250 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'",
1251 os::current_thread_id());
1252 log_identity(xtty);
1253 xtty->stamp();
1254 xtty->end_elem();
1255 }
1256 }
1257
1258 CompileTask::print_ul(this, "made not entrant");
1259 if (PrintCompilation) {
1260 print_on(tty, "made not entrant");
1261 }
1262 }
1263
1264 void nmethod::unlink_from_method() {
1265 if (method() != NULL) {
1266 method()->unlink_code(this);
1267 }
1268 }
1269
1270 // Invalidate code
1271 bool nmethod::make_not_entrant() {
1272 // This can be called while the system is already at a safepoint which is ok
1273 NoSafepointVerifier nsv;
1274
1275 if (is_unloading()) {
1276 // If the nmethod is unloading, then it is already not entrant through
1277 // the nmethod entry barriers. No need to do anything; GC will unload it.
1278 return false;
1279 }
1280
1281 if (Atomic::load(&_state) == not_entrant) {
1282 // Avoid taking the lock if already in required state.
1283 // This is safe from races because the state is an end-state,
1284 // which the nmethod cannot back out of once entered.
1285 // No need for fencing either.
1286 return false;
1287 }
1288
1289 {
1290 // Enter critical section. Does not block for safepoint.
1291 MutexLocker ml(CompiledMethod_lock->owned_by_self() ? NULL : CompiledMethod_lock, Mutex::_no_safepoint_check_flag);
1292
1293 if (Atomic::load(&_state) == not_entrant) {
1294 // another thread already performed this transition so nothing
1295 // to do, but return false to indicate this.
1296 return false;
1297 }
1298
1299 if (is_osr_method()) {
1300 // This logic is equivalent to the logic below for patching the
1301 // verified entry point of regular methods.
1302 // this effectively makes the osr nmethod not entrant
1303 invalidate_osr_method();
1304 } else {
1305 // The caller can be calling the method statically or through an inline
1306 // cache call.
1307 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
1308 SharedRuntime::get_handle_wrong_method_stub());
1309 }
1310
1311 if (update_recompile_counts()) {
1312 // Mark the method as decompiled.
1313 inc_decompile_count();
1314 }
1315
1316 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
1317 if (bs_nm == nullptr || !bs_nm->supports_entry_barrier(this)) {
1318 // If nmethod entry barriers are not supported, we won't mark
1319 // nmethods as on-stack when they become on-stack. So we
1320 // degrade to a less accurate flushing strategy, for now.
1321 mark_as_maybe_on_stack();
1322 }
1323
1324 // Change state
1325 bool success = try_transition(not_entrant);
1326 assert(success, "Transition can't fail");
1327
1328 // Log the transition once
1329 log_state_change();
1330
1331 // Remove nmethod from method.
1332 unlink_from_method();
1333
1334 } // leave critical region under CompiledMethod_lock
1335
1336 #if INCLUDE_JVMCI
1337 // Invalidate can't occur while holding the Patching lock
1338 JVMCINMethodData* nmethod_data = jvmci_nmethod_data();
1339 if (nmethod_data != NULL) {
1340 nmethod_data->invalidate_nmethod_mirror(this);
1341 }
1342 #endif
1343
1344 #ifdef ASSERT
1345 if (is_osr_method() && method() != NULL) {
1346 // Make sure osr nmethod is invalidated, i.e. not on the list
1347 bool found = method()->method_holder()->remove_osr_nmethod(this);
1348 assert(!found, "osr nmethod should have been invalidated");
1349 }
1350 #endif
1351
1352 return true;
1353 }
1354
1355 // For concurrent GCs, there must be a handshake between unlink and flush
1356 void nmethod::unlink() {
1357 if (_unlinked_next != NULL) {
1358 // Already unlinked. It can be invoked twice because concurrent code cache
1359 // unloading might need to restart when inline cache cleaning fails due to
1360 // running out of ICStubs, which can only be refilled at safepoints
1361 return;
1362 }
1363
1364 flush_dependencies();
1365
1366 // unlink_from_method will take the CompiledMethod_lock.
1367 // In this case we don't strictly need it when unlinking nmethods from
1368 // the Method, because it is only concurrently unlinked by
1369 // the entry barrier, which acquires the per nmethod lock.
1370 unlink_from_method();
1371 clear_ic_callsites();
1372
1373 if (is_osr_method()) {
1374 invalidate_osr_method();
1375 }
1376
1377 #if INCLUDE_JVMCI
1378 // Clear the link between this nmethod and a HotSpotNmethod mirror
1379 JVMCINMethodData* nmethod_data = jvmci_nmethod_data();
1380 if (nmethod_data != NULL) {
1381 nmethod_data->invalidate_nmethod_mirror(this);
1382 }
1383 #endif
1384
1385 // Post before flushing as jmethodID is being used
1386 post_compiled_method_unload();
1387
1388 // Register for flushing when it is safe. For concurrent class unloading,
1389 // that would be after the unloading handshake, and for STW class unloading
1390 // that would be when getting back to the VM thread.
1391 CodeCache::register_unlinked(this);
1392 }
1393
1394 void nmethod::flush() {
1395 MutexLocker ml(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1396
1397 // completely deallocate this method
1398 Events::log(Thread::current(), "flushing nmethod " INTPTR_FORMAT, p2i(this));
1399 log_debug(codecache)("*flushing %s nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT
1400 "/Free CodeCache:" SIZE_FORMAT "Kb",
1401 is_osr_method() ? "osr" : "",_compile_id, p2i(this), CodeCache::blob_count(),
1402 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024);
1403
1404 // We need to deallocate any ExceptionCache data.
1405 // Note that we do not need to grab the nmethod lock for this, it
1406 // better be thread safe if we're disposing of it!
1407 ExceptionCache* ec = exception_cache();
1408 while(ec != NULL) {
1409 ExceptionCache* next = ec->next();
1410 delete ec;
1411 ec = next;
1412 }
1413
1414 Universe::heap()->unregister_nmethod(this);
1415 CodeCache::unregister_old_nmethod(this);
1416
1417 CodeBlob::flush();
1418 CodeCache::free(this);
1419 }
1420
1421 oop nmethod::oop_at(int index) const {
1422 if (index == 0) {
1423 return NULL;
1424 }
1425 return NativeAccess<AS_NO_KEEPALIVE>::oop_load(oop_addr_at(index));
1426 }
1427
1428 oop nmethod::oop_at_phantom(int index) const {
1429 if (index == 0) {
1430 return NULL;
1431 }
1432 return NativeAccess<ON_PHANTOM_OOP_REF>::oop_load(oop_addr_at(index));
1433 }
1434
1435 //
1436 // Notify all classes this nmethod is dependent on that it is no
1437 // longer dependent.
1438
1439 void nmethod::flush_dependencies() {
1440 if (!has_flushed_dependencies()) {
1441 set_has_flushed_dependencies();
1442 for (Dependencies::DepStream deps(this); deps.next(); ) {
1443 if (deps.type() == Dependencies::call_site_target_value) {
1444 // CallSite dependencies are managed on per-CallSite instance basis.
1445 oop call_site = deps.argument_oop(0);
1446 MethodHandles::clean_dependency_context(call_site);
1447 } else {
1448 Klass* klass = deps.context_type();
1449 if (klass == NULL) {
1450 continue; // ignore things like evol_method
1451 }
1452 // During GC liveness of dependee determines class that needs to be updated.
1453 // The GC may clean dependency contexts concurrently and in parallel.
1454 InstanceKlass::cast(klass)->clean_dependency_context();
1455 }
1456 }
1457 }
1458 }
1459
1460 void nmethod::post_compiled_method(CompileTask* task) {
1461 task->mark_success();
1462 task->set_nm_content_size(content_size());
1463 task->set_nm_insts_size(insts_size());
1464 task->set_nm_total_size(total_size());
1465
1466 // JVMTI -- compiled method notification (must be done outside lock)
1467 post_compiled_method_load_event();
1468
1469 if (CompilationLog::log() != NULL) {
1470 CompilationLog::log()->log_nmethod(JavaThread::current(), this);
1471 }
1472
1473 const DirectiveSet* directive = task->directive();
1474 maybe_print_nmethod(directive);
1475 }
1476
1477 // ------------------------------------------------------------------
1478 // post_compiled_method_load_event
1479 // new method for install_code() path
1480 // Transfer information from compilation to jvmti
1481 void nmethod::post_compiled_method_load_event(JvmtiThreadState* state) {
1482 // This is a bad time for a safepoint. We don't want
1483 // this nmethod to get unloaded while we're queueing the event.
1484 NoSafepointVerifier nsv;
1485
1486 Method* m = method();
1487 HOTSPOT_COMPILED_METHOD_LOAD(
1488 (char *) m->klass_name()->bytes(),
1489 m->klass_name()->utf8_length(),
1490 (char *) m->name()->bytes(),
1491 m->name()->utf8_length(),
1492 (char *) m->signature()->bytes(),
1493 m->signature()->utf8_length(),
1494 insts_begin(), insts_size());
1495
1496
1497 if (JvmtiExport::should_post_compiled_method_load()) {
1498 // Only post unload events if load events are found.
1499 set_load_reported();
1500 // If a JavaThread hasn't been passed in, let the Service thread
1501 // (which is a real Java thread) post the event
1502 JvmtiDeferredEvent event = JvmtiDeferredEvent::compiled_method_load_event(this);
1503 if (state == NULL) {
1504 // Execute any barrier code for this nmethod as if it's called, since
1505 // keeping it alive looks like stack walking.
1506 run_nmethod_entry_barrier();
1507 ServiceThread::enqueue_deferred_event(&event);
1508 } else {
1509 // This enters the nmethod barrier outside in the caller.
1510 state->enqueue_event(&event);
1511 }
1512 }
1513 }
1514
1515 void nmethod::post_compiled_method_unload() {
1516 assert(_method != NULL, "just checking");
1517 DTRACE_METHOD_UNLOAD_PROBE(method());
1518
1519 // If a JVMTI agent has enabled the CompiledMethodUnload event then
1520 // post the event. The Method* will not be valid when this is freed.
1521
1522 // Don't bother posting the unload if the load event wasn't posted.
1523 if (load_reported() && JvmtiExport::should_post_compiled_method_unload()) {
1524 JvmtiDeferredEvent event =
1525 JvmtiDeferredEvent::compiled_method_unload_event(
1526 method()->jmethod_id(), insts_begin());
1527 ServiceThread::enqueue_deferred_event(&event);
1528 }
1529 }
1530
1531 // Iterate over metadata calling this function. Used by RedefineClasses
1532 void nmethod::metadata_do(MetadataClosure* f) {
1533 {
1534 // Visit all immediate references that are embedded in the instruction stream.
1535 RelocIterator iter(this, oops_reloc_begin());
1536 while (iter.next()) {
1537 if (iter.type() == relocInfo::metadata_type) {
1538 metadata_Relocation* r = iter.metadata_reloc();
1539 // In this metadata, we must only follow those metadatas directly embedded in
1540 // the code. Other metadatas (oop_index>0) are seen as part of
1541 // the metadata section below.
1542 assert(1 == (r->metadata_is_immediate()) +
1543 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
1544 "metadata must be found in exactly one place");
1545 if (r->metadata_is_immediate() && r->metadata_value() != NULL) {
1546 Metadata* md = r->metadata_value();
1547 if (md != _method) f->do_metadata(md);
1548 }
1549 } else if (iter.type() == relocInfo::virtual_call_type) {
1550 // Check compiledIC holders associated with this nmethod
1551 ResourceMark rm;
1552 CompiledIC *ic = CompiledIC_at(&iter);
1553 if (ic->is_icholder_call()) {
1554 CompiledICHolder* cichk = ic->cached_icholder();
1555 f->do_metadata(cichk->holder_metadata());
1556 f->do_metadata(cichk->holder_klass());
1557 } else {
1558 Metadata* ic_oop = ic->cached_metadata();
1559 if (ic_oop != NULL) {
1560 f->do_metadata(ic_oop);
1561 }
1562 }
1563 }
1564 }
1565 }
1566
1567 // Visit the metadata section
1568 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
1569 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops
1570 Metadata* md = *p;
1571 f->do_metadata(md);
1572 }
1573
1574 // Visit metadata not embedded in the other places.
1575 if (_method != NULL) f->do_metadata(_method);
1576 }
1577
1578 // Heuristic for nuking nmethods even though their oops are live.
1579 // Main purpose is to reduce code cache pressure and get rid of
1580 // nmethods that don't seem to be all that relevant any longer.
1581 bool nmethod::is_cold() {
1582 if (!MethodFlushing || is_native_method() || is_not_installed()) {
1583 // No heuristic unloading at all
1584 return false;
1585 }
1586
1587 if (!is_maybe_on_stack() && is_not_entrant()) {
1588 // Not entrant nmethods that are not on any stack can just
1589 // be removed
1590 return true;
1591 }
1592
1593 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
1594 if (bs_nm == nullptr || !bs_nm->supports_entry_barrier(this)) {
1595 // On platforms that don't support nmethod entry barriers, we can't
1596 // trust the temporal aspect of the gc epochs. So we can't detect
1597 // cold nmethods on such platforms.
1598 return false;
1599 }
1600
1601 if (!UseCodeCacheFlushing) {
1602 // Bail out if we don't heuristically remove nmethods
1603 return false;
1604 }
1605
1606 // Other code can be phased out more gradually after N GCs
1607 return CodeCache::previous_completed_gc_marking_cycle() > _gc_epoch + 2 * CodeCache::cold_gc_count();
1608 }
1609
1610 // The _is_unloading_state encodes a tuple comprising the unloading cycle
1611 // and the result of IsUnloadingBehaviour::is_unloading() for that cycle.
1612 // This is the bit layout of the _is_unloading_state byte: 00000CCU
1613 // CC refers to the cycle, which has 2 bits, and U refers to the result of
1614 // IsUnloadingBehaviour::is_unloading() for that unloading cycle.
1615
1616 class IsUnloadingState: public AllStatic {
1617 static const uint8_t _is_unloading_mask = 1;
1618 static const uint8_t _is_unloading_shift = 0;
1619 static const uint8_t _unloading_cycle_mask = 6;
1620 static const uint8_t _unloading_cycle_shift = 1;
1621
1622 static uint8_t set_is_unloading(uint8_t state, bool value) {
1623 state &= ~_is_unloading_mask;
1624 if (value) {
1625 state |= 1 << _is_unloading_shift;
1626 }
1627 assert(is_unloading(state) == value, "unexpected unloading cycle overflow");
1628 return state;
1629 }
1630
1631 static uint8_t set_unloading_cycle(uint8_t state, uint8_t value) {
1632 state &= ~_unloading_cycle_mask;
1633 state |= value << _unloading_cycle_shift;
1634 assert(unloading_cycle(state) == value, "unexpected unloading cycle overflow");
1635 return state;
1636 }
1637
1638 public:
1639 static bool is_unloading(uint8_t state) { return (state & _is_unloading_mask) >> _is_unloading_shift == 1; }
1640 static uint8_t unloading_cycle(uint8_t state) { return (state & _unloading_cycle_mask) >> _unloading_cycle_shift; }
1641
1642 static uint8_t create(bool is_unloading, uint8_t unloading_cycle) {
1643 uint8_t state = 0;
1644 state = set_is_unloading(state, is_unloading);
1645 state = set_unloading_cycle(state, unloading_cycle);
1646 return state;
1647 }
1648 };
1649
1650 bool nmethod::is_unloading() {
1651 uint8_t state = RawAccess<MO_RELAXED>::load(&_is_unloading_state);
1652 bool state_is_unloading = IsUnloadingState::is_unloading(state);
1653 if (state_is_unloading) {
1654 return true;
1655 }
1656 uint8_t state_unloading_cycle = IsUnloadingState::unloading_cycle(state);
1657 uint8_t current_cycle = CodeCache::unloading_cycle();
1658 if (state_unloading_cycle == current_cycle) {
1659 return false;
1660 }
1661
1662 // The IsUnloadingBehaviour is responsible for calculating if the nmethod
1663 // should be unloaded. This can be either because there is a dead oop,
1664 // or because is_cold() heuristically determines it is time to unload.
1665 state_unloading_cycle = current_cycle;
1666 state_is_unloading = IsUnloadingBehaviour::is_unloading(this);
1667 state = IsUnloadingState::create(state_is_unloading, state_unloading_cycle);
1668
1669 RawAccess<MO_RELAXED>::store(&_is_unloading_state, state);
1670
1671 return state_is_unloading;
1672 }
1673
1674 void nmethod::clear_unloading_state() {
1675 uint8_t state = IsUnloadingState::create(false, CodeCache::unloading_cycle());
1676 RawAccess<MO_RELAXED>::store(&_is_unloading_state, state);
1677 }
1678
1679
1680 // This is called at the end of the strong tracing/marking phase of a
1681 // GC to unload an nmethod if it contains otherwise unreachable
1682 // oops or is heuristically found to be not important.
1683 void nmethod::do_unloading(bool unloading_occurred) {
1684 // Make sure the oop's ready to receive visitors
1685 if (is_unloading()) {
1686 unlink();
1687 } else {
1688 guarantee(unload_nmethod_caches(unloading_occurred),
1689 "Should not need transition stubs");
1690 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
1691 if (bs_nm != NULL) {
1692 bs_nm->disarm(this);
1693 }
1694 }
1695 }
1696
1697 void nmethod::oops_do(OopClosure* f, bool allow_dead) {
1698 // Prevent extra code cache walk for platforms that don't have immediate oops.
1699 if (relocInfo::mustIterateImmediateOopsInCode()) {
1700 RelocIterator iter(this, oops_reloc_begin());
1701
1702 while (iter.next()) {
1703 if (iter.type() == relocInfo::oop_type ) {
1704 oop_Relocation* r = iter.oop_reloc();
1705 // In this loop, we must only follow those oops directly embedded in
1706 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1707 assert(1 == (r->oop_is_immediate()) +
1708 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1709 "oop must be found in exactly one place");
1710 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1711 f->do_oop(r->oop_addr());
1712 }
1713 }
1714 }
1715 }
1716
1717 // Scopes
1718 // This includes oop constants not inlined in the code stream.
1719 for (oop* p = oops_begin(); p < oops_end(); p++) {
1720 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1721 f->do_oop(p);
1722 }
1723 }
1724
1725 void nmethod::follow_nmethod(OopIterateClosure* cl) {
1726 // Process oops in the nmethod
1727 oops_do(cl);
1728
1729 // CodeCache unloading support
1730 mark_as_maybe_on_stack();
1731
1732 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
1733 bs_nm->disarm(this);
1734
1735 // There's an assumption made that this function is not used by GCs that
1736 // relocate objects, and therefore we don't call fix_oop_relocations.
1737 }
1738
1739 nmethod* volatile nmethod::_oops_do_mark_nmethods;
1740
1741 void nmethod::oops_do_log_change(const char* state) {
1742 LogTarget(Trace, gc, nmethod) lt;
1743 if (lt.is_enabled()) {
1744 LogStream ls(lt);
1745 CompileTask::print(&ls, this, state, true /* short_form */);
1746 }
1747 }
1748
1749 bool nmethod::oops_do_try_claim() {
1750 if (oops_do_try_claim_weak_request()) {
1751 nmethod* result = oops_do_try_add_to_list_as_weak_done();
1752 assert(result == NULL, "adding to global list as weak done must always succeed.");
1753 return true;
1754 }
1755 return false;
1756 }
1757
1758 bool nmethod::oops_do_try_claim_weak_request() {
1759 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
1760
1761 if ((_oops_do_mark_link == NULL) &&
1762 (Atomic::replace_if_null(&_oops_do_mark_link, mark_link(this, claim_weak_request_tag)))) {
1763 oops_do_log_change("oops_do, mark weak request");
1764 return true;
1765 }
1766 return false;
1767 }
1768
1769 void nmethod::oops_do_set_strong_done(nmethod* old_head) {
1770 _oops_do_mark_link = mark_link(old_head, claim_strong_done_tag);
1771 }
1772
1773 nmethod::oops_do_mark_link* nmethod::oops_do_try_claim_strong_done() {
1774 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
1775
1776 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));
1777 if (old_next == NULL) {
1778 oops_do_log_change("oops_do, mark strong done");
1779 }
1780 return old_next;
1781 }
1782
1783 nmethod::oops_do_mark_link* nmethod::oops_do_try_add_strong_request(nmethod::oops_do_mark_link* next) {
1784 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
1785 assert(next == mark_link(this, claim_weak_request_tag), "Should be claimed as weak");
1786
1787 oops_do_mark_link* old_next = Atomic::cmpxchg(&_oops_do_mark_link, next, mark_link(this, claim_strong_request_tag));
1788 if (old_next == next) {
1789 oops_do_log_change("oops_do, mark strong request");
1790 }
1791 return old_next;
1792 }
1793
1794 bool nmethod::oops_do_try_claim_weak_done_as_strong_done(nmethod::oops_do_mark_link* next) {
1795 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
1796 assert(extract_state(next) == claim_weak_done_tag, "Should be claimed as weak done");
1797
1798 oops_do_mark_link* old_next = Atomic::cmpxchg(&_oops_do_mark_link, next, mark_link(extract_nmethod(next), claim_strong_done_tag));
1799 if (old_next == next) {
1800 oops_do_log_change("oops_do, mark weak done -> mark strong done");
1801 return true;
1802 }
1803 return false;
1804 }
1805
1806 nmethod* nmethod::oops_do_try_add_to_list_as_weak_done() {
1807 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
1808
1809 assert(extract_state(_oops_do_mark_link) == claim_weak_request_tag ||
1810 extract_state(_oops_do_mark_link) == claim_strong_request_tag,
1811 "must be but is nmethod " PTR_FORMAT " %u", p2i(extract_nmethod(_oops_do_mark_link)), extract_state(_oops_do_mark_link));
1812
1813 nmethod* old_head = Atomic::xchg(&_oops_do_mark_nmethods, this);
1814 // Self-loop if needed.
1815 if (old_head == NULL) {
1816 old_head = this;
1817 }
1818 // Try to install end of list and weak done tag.
1819 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)) {
1820 oops_do_log_change("oops_do, mark weak done");
1821 return NULL;
1822 } else {
1823 return old_head;
1824 }
1825 }
1826
1827 void nmethod::oops_do_add_to_list_as_strong_done() {
1828 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
1829
1830 nmethod* old_head = Atomic::xchg(&_oops_do_mark_nmethods, this);
1831 // Self-loop if needed.
1832 if (old_head == NULL) {
1833 old_head = this;
1834 }
1835 assert(_oops_do_mark_link == mark_link(this, claim_strong_done_tag), "must be but is nmethod " PTR_FORMAT " state %u",
1836 p2i(extract_nmethod(_oops_do_mark_link)), extract_state(_oops_do_mark_link));
1837
1838 oops_do_set_strong_done(old_head);
1839 }
1840
1841 void nmethod::oops_do_process_weak(OopsDoProcessor* p) {
1842 if (!oops_do_try_claim_weak_request()) {
1843 // Failed to claim for weak processing.
1844 oops_do_log_change("oops_do, mark weak request fail");
1845 return;
1846 }
1847
1848 p->do_regular_processing(this);
1849
1850 nmethod* old_head = oops_do_try_add_to_list_as_weak_done();
1851 if (old_head == NULL) {
1852 return;
1853 }
1854 oops_do_log_change("oops_do, mark weak done fail");
1855 // Adding to global list failed, another thread added a strong request.
1856 assert(extract_state(_oops_do_mark_link) == claim_strong_request_tag,
1857 "must be but is %u", extract_state(_oops_do_mark_link));
1858
1859 oops_do_log_change("oops_do, mark weak request -> mark strong done");
1860
1861 oops_do_set_strong_done(old_head);
1862 // Do missing strong processing.
1863 p->do_remaining_strong_processing(this);
1864 }
1865
1866 void nmethod::oops_do_process_strong(OopsDoProcessor* p) {
1867 oops_do_mark_link* next_raw = oops_do_try_claim_strong_done();
1868 if (next_raw == NULL) {
1869 p->do_regular_processing(this);
1870 oops_do_add_to_list_as_strong_done();
1871 return;
1872 }
1873 // Claim failed. Figure out why and handle it.
1874 if (oops_do_has_weak_request(next_raw)) {
1875 oops_do_mark_link* old = next_raw;
1876 // Claim failed because being weak processed (state == "weak request").
1877 // Try to request deferred strong processing.
1878 next_raw = oops_do_try_add_strong_request(old);
1879 if (next_raw == old) {
1880 // Successfully requested deferred strong processing.
1881 return;
1882 }
1883 // Failed because of a concurrent transition. No longer in "weak request" state.
1884 }
1885 if (oops_do_has_any_strong_state(next_raw)) {
1886 // Already claimed for strong processing or requested for such.
1887 return;
1888 }
1889 if (oops_do_try_claim_weak_done_as_strong_done(next_raw)) {
1890 // Successfully claimed "weak done" as "strong done". Do the missing marking.
1891 p->do_remaining_strong_processing(this);
1892 return;
1893 }
1894 // Claim failed, some other thread got it.
1895 }
1896
1897 void nmethod::oops_do_marking_prologue() {
1898 assert_at_safepoint();
1899
1900 log_trace(gc, nmethod)("oops_do_marking_prologue");
1901 assert(_oops_do_mark_nmethods == NULL, "must be empty");
1902 }
1903
1904 void nmethod::oops_do_marking_epilogue() {
1905 assert_at_safepoint();
1906
1907 nmethod* next = _oops_do_mark_nmethods;
1908 _oops_do_mark_nmethods = NULL;
1909 if (next != NULL) {
1910 nmethod* cur;
1911 do {
1912 cur = next;
1913 next = extract_nmethod(cur->_oops_do_mark_link);
1914 cur->_oops_do_mark_link = NULL;
1915 DEBUG_ONLY(cur->verify_oop_relocations());
1916
1917 LogTarget(Trace, gc, nmethod) lt;
1918 if (lt.is_enabled()) {
1919 LogStream ls(lt);
1920 CompileTask::print(&ls, cur, "oops_do, unmark", /*short_form:*/ true);
1921 }
1922 // End if self-loop has been detected.
1923 } while (cur != next);
1924 }
1925 log_trace(gc, nmethod)("oops_do_marking_epilogue");
1926 }
1927
1928 inline bool includes(void* p, void* from, void* to) {
1929 return from <= p && p < to;
1930 }
1931
1932
1933 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
1934 assert(count >= 2, "must be sentinel values, at least");
1935
1936 #ifdef ASSERT
1937 // must be sorted and unique; we do a binary search in find_pc_desc()
1938 int prev_offset = pcs[0].pc_offset();
1939 assert(prev_offset == PcDesc::lower_offset_limit,
1940 "must start with a sentinel");
1941 for (int i = 1; i < count; i++) {
1942 int this_offset = pcs[i].pc_offset();
1943 assert(this_offset > prev_offset, "offsets must be sorted");
1944 prev_offset = this_offset;
1945 }
1946 assert(prev_offset == PcDesc::upper_offset_limit,
1947 "must end with a sentinel");
1948 #endif //ASSERT
1949
1950 // Search for MethodHandle invokes and tag the nmethod.
1951 for (int i = 0; i < count; i++) {
1952 if (pcs[i].is_method_handle_invoke()) {
1953 set_has_method_handle_invokes(true);
1954 break;
1955 }
1956 }
1957 assert(has_method_handle_invokes() == (_deopt_mh_handler_begin != NULL), "must have deopt mh handler");
1958
1959 int size = count * sizeof(PcDesc);
1960 assert(scopes_pcs_size() >= size, "oob");
1961 memcpy(scopes_pcs_begin(), pcs, size);
1962
1963 // Adjust the final sentinel downward.
1964 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
1965 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
1966 last_pc->set_pc_offset(content_size() + 1);
1967 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
1968 // Fill any rounding gaps with copies of the last record.
1969 last_pc[1] = last_pc[0];
1970 }
1971 // The following assert could fail if sizeof(PcDesc) is not
1972 // an integral multiple of oopSize (the rounding term).
1973 // If it fails, change the logic to always allocate a multiple
1974 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
1975 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
1976 }
1977
1978 void nmethod::copy_scopes_data(u_char* buffer, int size) {
1979 assert(scopes_data_size() >= size, "oob");
1980 memcpy(scopes_data_begin(), buffer, size);
1981 }
1982
1983 #ifdef ASSERT
1984 static PcDesc* linear_search(const PcDescSearch& search, int pc_offset, bool approximate) {
1985 PcDesc* lower = search.scopes_pcs_begin();
1986 PcDesc* upper = search.scopes_pcs_end();
1987 lower += 1; // exclude initial sentinel
1988 PcDesc* res = NULL;
1989 for (PcDesc* p = lower; p < upper; p++) {
1990 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc
1991 if (match_desc(p, pc_offset, approximate)) {
1992 if (res == NULL)
1993 res = p;
1994 else
1995 res = (PcDesc*) badAddress;
1996 }
1997 }
1998 return res;
1999 }
2000 #endif
2001
2002
2003 // Finds a PcDesc with real-pc equal to "pc"
2004 PcDesc* PcDescContainer::find_pc_desc_internal(address pc, bool approximate, const PcDescSearch& search) {
2005 address base_address = search.code_begin();
2006 if ((pc < base_address) ||
2007 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
2008 return NULL; // PC is wildly out of range
2009 }
2010 int pc_offset = (int) (pc - base_address);
2011
2012 // Check the PcDesc cache if it contains the desired PcDesc
2013 // (This as an almost 100% hit rate.)
2014 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
2015 if (res != NULL) {
2016 assert(res == linear_search(search, pc_offset, approximate), "cache ok");
2017 return res;
2018 }
2019
2020 // Fallback algorithm: quasi-linear search for the PcDesc
2021 // Find the last pc_offset less than the given offset.
2022 // The successor must be the required match, if there is a match at all.
2023 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
2024 PcDesc* lower = search.scopes_pcs_begin();
2025 PcDesc* upper = search.scopes_pcs_end();
2026 upper -= 1; // exclude final sentinel
2027 if (lower >= upper) return NULL; // native method; no PcDescs at all
2028
2029 #define assert_LU_OK \
2030 /* invariant on lower..upper during the following search: */ \
2031 assert(lower->pc_offset() < pc_offset, "sanity"); \
2032 assert(upper->pc_offset() >= pc_offset, "sanity")
2033 assert_LU_OK;
2034
2035 // Use the last successful return as a split point.
2036 PcDesc* mid = _pc_desc_cache.last_pc_desc();
2037 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
2038 if (mid->pc_offset() < pc_offset) {
2039 lower = mid;
2040 } else {
2041 upper = mid;
2042 }
2043
2044 // Take giant steps at first (4096, then 256, then 16, then 1)
2045 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
2046 const int RADIX = (1 << LOG2_RADIX);
2047 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
2048 while ((mid = lower + step) < upper) {
2049 assert_LU_OK;
2050 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
2051 if (mid->pc_offset() < pc_offset) {
2052 lower = mid;
2053 } else {
2054 upper = mid;
2055 break;
2056 }
2057 }
2058 assert_LU_OK;
2059 }
2060
2061 // Sneak up on the value with a linear search of length ~16.
2062 while (true) {
2063 assert_LU_OK;
2064 mid = lower + 1;
2065 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
2066 if (mid->pc_offset() < pc_offset) {
2067 lower = mid;
2068 } else {
2069 upper = mid;
2070 break;
2071 }
2072 }
2073 #undef assert_LU_OK
2074
2075 if (match_desc(upper, pc_offset, approximate)) {
2076 assert(upper == linear_search(search, pc_offset, approximate), "search ok");
2077 _pc_desc_cache.add_pc_desc(upper);
2078 return upper;
2079 } else {
2080 assert(NULL == linear_search(search, pc_offset, approximate), "search ok");
2081 return NULL;
2082 }
2083 }
2084
2085
2086 void nmethod::check_all_dependencies(DepChange& changes) {
2087 // Checked dependencies are allocated into this ResourceMark
2088 ResourceMark rm;
2089
2090 // Turn off dependency tracing while actually testing dependencies.
2091 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) );
2092
2093 typedef ResourceHashtable<DependencySignature, int, 11027,
2094 ResourceObj::RESOURCE_AREA, mtInternal,
2095 &DependencySignature::hash,
2096 &DependencySignature::equals> DepTable;
2097
2098 DepTable* table = new DepTable();
2099
2100 // Iterate over live nmethods and check dependencies of all nmethods that are not
2101 // marked for deoptimization. A particular dependency is only checked once.
2102 NMethodIterator iter(NMethodIterator::only_not_unloading);
2103 while(iter.next()) {
2104 nmethod* nm = iter.method();
2105 // Only notify for live nmethods
2106 if (!nm->is_marked_for_deoptimization()) {
2107 for (Dependencies::DepStream deps(nm); deps.next(); ) {
2108 // Construct abstraction of a dependency.
2109 DependencySignature* current_sig = new DependencySignature(deps);
2110
2111 // Determine if dependency is already checked. table->put(...) returns
2112 // 'true' if the dependency is added (i.e., was not in the hashtable).
2113 if (table->put(*current_sig, 1)) {
2114 if (deps.check_dependency() != NULL) {
2115 // Dependency checking failed. Print out information about the failed
2116 // dependency and finally fail with an assert. We can fail here, since
2117 // dependency checking is never done in a product build.
2118 tty->print_cr("Failed dependency:");
2119 changes.print();
2120 nm->print();
2121 nm->print_dependencies();
2122 assert(false, "Should have been marked for deoptimization");
2123 }
2124 }
2125 }
2126 }
2127 }
2128 }
2129
2130 bool nmethod::check_dependency_on(DepChange& changes) {
2131 // What has happened:
2132 // 1) a new class dependee has been added
2133 // 2) dependee and all its super classes have been marked
2134 bool found_check = false; // set true if we are upset
2135 for (Dependencies::DepStream deps(this); deps.next(); ) {
2136 // Evaluate only relevant dependencies.
2137 if (deps.spot_check_dependency_at(changes) != NULL) {
2138 found_check = true;
2139 NOT_DEBUG(break);
2140 }
2141 }
2142 return found_check;
2143 }
2144
2145 // Called from mark_for_deoptimization, when dependee is invalidated.
2146 bool nmethod::is_dependent_on_method(Method* dependee) {
2147 for (Dependencies::DepStream deps(this); deps.next(); ) {
2148 if (deps.type() != Dependencies::evol_method)
2149 continue;
2150 Method* method = deps.method_argument(0);
2151 if (method == dependee) return true;
2152 }
2153 return false;
2154 }
2155
2156 void nmethod_init() {
2157 // make sure you didn't forget to adjust the filler fields
2158 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
2159 }
2160
2161 // -----------------------------------------------------------------------------
2162 // Verification
2163
2164 class VerifyOopsClosure: public OopClosure {
2165 nmethod* _nm;
2166 bool _ok;
2167 public:
2168 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
2169 bool ok() { return _ok; }
2170 virtual void do_oop(oop* p) {
2171 if (oopDesc::is_oop_or_null(*p)) return;
2172 // Print diagnostic information before calling print_nmethod().
2173 // Assertions therein might prevent call from returning.
2174 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2175 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2176 if (_ok) {
2177 _nm->print_nmethod(true);
2178 _ok = false;
2179 }
2180 }
2181 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2182 };
2183
2184 class VerifyMetadataClosure: public MetadataClosure {
2185 public:
2186 void do_metadata(Metadata* md) {
2187 if (md->is_method()) {
2188 Method* method = (Method*)md;
2189 assert(!method->is_old(), "Should not be installing old methods");
2190 }
2191 }
2192 };
2193
2194
2195 void nmethod::verify() {
2196 if (is_not_entrant())
2197 return;
2198
2199 // Make sure all the entry points are correctly aligned for patching.
2200 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
2201
2202 // assert(oopDesc::is_oop(method()), "must be valid");
2203
2204 ResourceMark rm;
2205
2206 if (!CodeCache::contains(this)) {
2207 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this));
2208 }
2209
2210 if(is_native_method() )
2211 return;
2212
2213 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
2214 if (nm != this) {
2215 fatal("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this));
2216 }
2217
2218 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2219 if (! p->verify(this)) {
2220 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this));
2221 }
2222 }
2223
2224 #ifdef ASSERT
2225 #if INCLUDE_JVMCI
2226 {
2227 // Verify that implicit exceptions that deoptimize have a PcDesc and OopMap
2228 ImmutableOopMapSet* oms = oop_maps();
2229 ImplicitExceptionTable implicit_table(this);
2230 for (uint i = 0; i < implicit_table.len(); i++) {
2231 int exec_offset = (int) implicit_table.get_exec_offset(i);
2232 if (implicit_table.get_exec_offset(i) == implicit_table.get_cont_offset(i)) {
2233 assert(pc_desc_at(code_begin() + exec_offset) != NULL, "missing PcDesc");
2234 bool found = false;
2235 for (int i = 0, imax = oms->count(); i < imax; i++) {
2236 if (oms->pair_at(i)->pc_offset() == exec_offset) {
2237 found = true;
2238 break;
2239 }
2240 }
2241 assert(found, "missing oopmap");
2242 }
2243 }
2244 }
2245 #endif
2246 #endif
2247
2248 VerifyOopsClosure voc(this);
2249 oops_do(&voc);
2250 assert(voc.ok(), "embedded oops must be OK");
2251 Universe::heap()->verify_nmethod(this);
2252
2253 assert(_oops_do_mark_link == NULL, "_oops_do_mark_link for %s should be NULL but is " PTR_FORMAT,
2254 nm->method()->external_name(), p2i(_oops_do_mark_link));
2255 verify_scopes();
2256
2257 CompiledICLocker nm_verify(this);
2258 VerifyMetadataClosure vmc;
2259 metadata_do(&vmc);
2260 }
2261
2262
2263 void nmethod::verify_interrupt_point(address call_site) {
2264
2265 // Verify IC only when nmethod installation is finished.
2266 if (!is_not_installed()) {
2267 if (CompiledICLocker::is_safe(this)) {
2268 CompiledIC_at(this, call_site);
2269 } else {
2270 CompiledICLocker ml_verify(this);
2271 CompiledIC_at(this, call_site);
2272 }
2273 }
2274
2275 HandleMark hm(Thread::current());
2276
2277 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address());
2278 assert(pd != NULL, "PcDesc must exist");
2279 for (ScopeDesc* sd = new ScopeDesc(this, pd);
2280 !sd->is_top(); sd = sd->sender()) {
2281 sd->verify();
2282 }
2283 }
2284
2285 void nmethod::verify_scopes() {
2286 if( !method() ) return; // Runtime stubs have no scope
2287 if (method()->is_native()) return; // Ignore stub methods.
2288 // iterate through all interrupt point
2289 // and verify the debug information is valid.
2290 RelocIterator iter((nmethod*)this);
2291 while (iter.next()) {
2292 address stub = NULL;
2293 switch (iter.type()) {
2294 case relocInfo::virtual_call_type:
2295 verify_interrupt_point(iter.addr());
2296 break;
2297 case relocInfo::opt_virtual_call_type:
2298 stub = iter.opt_virtual_call_reloc()->static_stub();
2299 verify_interrupt_point(iter.addr());
2300 break;
2301 case relocInfo::static_call_type:
2302 stub = iter.static_call_reloc()->static_stub();
2303 //verify_interrupt_point(iter.addr());
2304 break;
2305 case relocInfo::runtime_call_type:
2306 case relocInfo::runtime_call_w_cp_type: {
2307 address destination = iter.reloc()->value();
2308 // Right now there is no way to find out which entries support
2309 // an interrupt point. It would be nice if we had this
2310 // information in a table.
2311 break;
2312 }
2313 default:
2314 break;
2315 }
2316 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section");
2317 }
2318 }
2319
2320
2321 // -----------------------------------------------------------------------------
2322 // Printing operations
2323
2324 void nmethod::print() const {
2325 ttyLocker ttyl; // keep the following output all in one block
2326 print(tty);
2327 }
2328
2329 void nmethod::print(outputStream* st) const {
2330 ResourceMark rm;
2331
2332 st->print("Compiled method ");
2333
2334 if (is_compiled_by_c1()) {
2335 st->print("(c1) ");
2336 } else if (is_compiled_by_c2()) {
2337 st->print("(c2) ");
2338 } else if (is_compiled_by_jvmci()) {
2339 st->print("(JVMCI) ");
2340 } else {
2341 st->print("(n/a) ");
2342 }
2343
2344 print_on(st, NULL);
2345
2346 if (WizardMode) {
2347 st->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this));
2348 st->print(" for method " INTPTR_FORMAT , p2i(method()));
2349 st->print(" { ");
2350 st->print_cr("%s ", state());
2351 st->print_cr("}:");
2352 }
2353 if (size () > 0) st->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2354 p2i(this),
2355 p2i(this) + size(),
2356 size());
2357 if (relocation_size () > 0) st->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2358 p2i(relocation_begin()),
2359 p2i(relocation_end()),
2360 relocation_size());
2361 if (consts_size () > 0) st->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2362 p2i(consts_begin()),
2363 p2i(consts_end()),
2364 consts_size());
2365 if (insts_size () > 0) st->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2366 p2i(insts_begin()),
2367 p2i(insts_end()),
2368 insts_size());
2369 if (stub_size () > 0) st->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2370 p2i(stub_begin()),
2371 p2i(stub_end()),
2372 stub_size());
2373 if (oops_size () > 0) st->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2374 p2i(oops_begin()),
2375 p2i(oops_end()),
2376 oops_size());
2377 if (metadata_size () > 0) st->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2378 p2i(metadata_begin()),
2379 p2i(metadata_end()),
2380 metadata_size());
2381 if (scopes_data_size () > 0) st->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2382 p2i(scopes_data_begin()),
2383 p2i(scopes_data_end()),
2384 scopes_data_size());
2385 if (scopes_pcs_size () > 0) st->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2386 p2i(scopes_pcs_begin()),
2387 p2i(scopes_pcs_end()),
2388 scopes_pcs_size());
2389 if (dependencies_size () > 0) st->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2390 p2i(dependencies_begin()),
2391 p2i(dependencies_end()),
2392 dependencies_size());
2393 if (handler_table_size() > 0) st->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2394 p2i(handler_table_begin()),
2395 p2i(handler_table_end()),
2396 handler_table_size());
2397 if (nul_chk_table_size() > 0) st->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2398 p2i(nul_chk_table_begin()),
2399 p2i(nul_chk_table_end()),
2400 nul_chk_table_size());
2401 #if INCLUDE_JVMCI
2402 if (speculations_size () > 0) st->print_cr(" speculations [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2403 p2i(speculations_begin()),
2404 p2i(speculations_end()),
2405 speculations_size());
2406 if (jvmci_data_size () > 0) st->print_cr(" JVMCI data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2407 p2i(jvmci_data_begin()),
2408 p2i(jvmci_data_end()),
2409 jvmci_data_size());
2410 #endif
2411 }
2412
2413 void nmethod::print_code() {
2414 ResourceMark m;
2415 ttyLocker ttyl;
2416 // Call the specialized decode method of this class.
2417 decode(tty);
2418 }
2419
2420 #ifndef PRODUCT // called InstanceKlass methods are available only then. Declared as PRODUCT_RETURN
2421
2422 void nmethod::print_dependencies() {
2423 ResourceMark rm;
2424 ttyLocker ttyl; // keep the following output all in one block
2425 tty->print_cr("Dependencies:");
2426 for (Dependencies::DepStream deps(this); deps.next(); ) {
2427 deps.print_dependency();
2428 Klass* ctxk = deps.context_type();
2429 if (ctxk != NULL) {
2430 if (ctxk->is_instance_klass() && InstanceKlass::cast(ctxk)->is_dependent_nmethod(this)) {
2431 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name());
2432 }
2433 }
2434 deps.log_dependency(); // put it into the xml log also
2435 }
2436 }
2437 #endif
2438
2439 #if defined(SUPPORT_DATA_STRUCTS)
2440
2441 // Print the oops from the underlying CodeBlob.
2442 void nmethod::print_oops(outputStream* st) {
2443 ResourceMark m;
2444 st->print("Oops:");
2445 if (oops_begin() < oops_end()) {
2446 st->cr();
2447 for (oop* p = oops_begin(); p < oops_end(); p++) {
2448 Disassembler::print_location((unsigned char*)p, (unsigned char*)oops_begin(), (unsigned char*)oops_end(), st, true, false);
2449 st->print(PTR_FORMAT " ", *((uintptr_t*)p));
2450 if (Universe::contains_non_oop_word(p)) {
2451 st->print_cr("NON_OOP");
2452 continue; // skip non-oops
2453 }
2454 if (*p == NULL) {
2455 st->print_cr("NULL-oop");
2456 continue; // skip non-oops
2457 }
2458 (*p)->print_value_on(st);
2459 st->cr();
2460 }
2461 } else {
2462 st->print_cr(" <list empty>");
2463 }
2464 }
2465
2466 // Print metadata pool.
2467 void nmethod::print_metadata(outputStream* st) {
2468 ResourceMark m;
2469 st->print("Metadata:");
2470 if (metadata_begin() < metadata_end()) {
2471 st->cr();
2472 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
2473 Disassembler::print_location((unsigned char*)p, (unsigned char*)metadata_begin(), (unsigned char*)metadata_end(), st, true, false);
2474 st->print(PTR_FORMAT " ", *((uintptr_t*)p));
2475 if (*p && *p != Universe::non_oop_word()) {
2476 (*p)->print_value_on(st);
2477 }
2478 st->cr();
2479 }
2480 } else {
2481 st->print_cr(" <list empty>");
2482 }
2483 }
2484
2485 #ifndef PRODUCT // ScopeDesc::print_on() is available only then. Declared as PRODUCT_RETURN
2486 void nmethod::print_scopes_on(outputStream* st) {
2487 // Find the first pc desc for all scopes in the code and print it.
2488 ResourceMark rm;
2489 st->print("scopes:");
2490 if (scopes_pcs_begin() < scopes_pcs_end()) {
2491 st->cr();
2492 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2493 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
2494 continue;
2495
2496 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
2497 while (sd != NULL) {
2498 sd->print_on(st, p); // print output ends with a newline
2499 sd = sd->sender();
2500 }
2501 }
2502 } else {
2503 st->print_cr(" <list empty>");
2504 }
2505 }
2506 #endif
2507
2508 #ifndef PRODUCT // RelocIterator does support printing only then.
2509 void nmethod::print_relocations() {
2510 ResourceMark m; // in case methods get printed via the debugger
2511 tty->print_cr("relocations:");
2512 RelocIterator iter(this);
2513 iter.print();
2514 }
2515 #endif
2516
2517 void nmethod::print_pcs_on(outputStream* st) {
2518 ResourceMark m; // in case methods get printed via debugger
2519 st->print("pc-bytecode offsets:");
2520 if (scopes_pcs_begin() < scopes_pcs_end()) {
2521 st->cr();
2522 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2523 p->print_on(st, this); // print output ends with a newline
2524 }
2525 } else {
2526 st->print_cr(" <list empty>");
2527 }
2528 }
2529
2530 void nmethod::print_handler_table() {
2531 ExceptionHandlerTable(this).print(code_begin());
2532 }
2533
2534 void nmethod::print_nul_chk_table() {
2535 ImplicitExceptionTable(this).print(code_begin());
2536 }
2537
2538 void nmethod::print_recorded_oop(int log_n, int i) {
2539 void* value;
2540
2541 if (i == 0) {
2542 value = NULL;
2543 } else {
2544 // Be careful around non-oop words. Don't create an oop
2545 // with that value, or it will assert in verification code.
2546 if (Universe::contains_non_oop_word(oop_addr_at(i))) {
2547 value = Universe::non_oop_word();
2548 } else {
2549 value = oop_at(i);
2550 }
2551 }
2552
2553 tty->print("#%*d: " INTPTR_FORMAT " ", log_n, i, p2i(value));
2554
2555 if (value == Universe::non_oop_word()) {
2556 tty->print("non-oop word");
2557 } else {
2558 if (value == 0) {
2559 tty->print("NULL-oop");
2560 } else {
2561 oop_at(i)->print_value_on(tty);
2562 }
2563 }
2564
2565 tty->cr();
2566 }
2567
2568 void nmethod::print_recorded_oops() {
2569 const int n = oops_count();
2570 const int log_n = (n<10) ? 1 : (n<100) ? 2 : (n<1000) ? 3 : (n<10000) ? 4 : 6;
2571 tty->print("Recorded oops:");
2572 if (n > 0) {
2573 tty->cr();
2574 for (int i = 0; i < n; i++) {
2575 print_recorded_oop(log_n, i);
2576 }
2577 } else {
2578 tty->print_cr(" <list empty>");
2579 }
2580 }
2581
2582 void nmethod::print_recorded_metadata() {
2583 const int n = metadata_count();
2584 const int log_n = (n<10) ? 1 : (n<100) ? 2 : (n<1000) ? 3 : (n<10000) ? 4 : 6;
2585 tty->print("Recorded metadata:");
2586 if (n > 0) {
2587 tty->cr();
2588 for (int i = 0; i < n; i++) {
2589 Metadata* m = metadata_at(i);
2590 tty->print("#%*d: " INTPTR_FORMAT " ", log_n, i, p2i(m));
2591 if (m == (Metadata*)Universe::non_oop_word()) {
2592 tty->print("non-metadata word");
2593 } else if (m == NULL) {
2594 tty->print("NULL-oop");
2595 } else {
2596 Metadata::print_value_on_maybe_null(tty, m);
2597 }
2598 tty->cr();
2599 }
2600 } else {
2601 tty->print_cr(" <list empty>");
2602 }
2603 }
2604 #endif
2605
2606 #if defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_ABSTRACT_ASSEMBLY)
2607
2608 void nmethod::print_constant_pool(outputStream* st) {
2609 //-----------------------------------
2610 //---< Print the constant pool >---
2611 //-----------------------------------
2612 int consts_size = this->consts_size();
2613 if ( consts_size > 0 ) {
2614 unsigned char* cstart = this->consts_begin();
2615 unsigned char* cp = cstart;
2616 unsigned char* cend = cp + consts_size;
2617 unsigned int bytes_per_line = 4;
2618 unsigned int CP_alignment = 8;
2619 unsigned int n;
2620
2621 st->cr();
2622
2623 //---< print CP header to make clear what's printed >---
2624 if( ((uintptr_t)cp&(CP_alignment-1)) == 0 ) {
2625 n = bytes_per_line;
2626 st->print_cr("[Constant Pool]");
2627 Disassembler::print_location(cp, cstart, cend, st, true, true);
2628 Disassembler::print_hexdata(cp, n, st, true);
2629 st->cr();
2630 } else {
2631 n = (uintptr_t)cp&(bytes_per_line-1);
2632 st->print_cr("[Constant Pool (unaligned)]");
2633 }
2634
2635 //---< print CP contents, bytes_per_line at a time >---
2636 while (cp < cend) {
2637 Disassembler::print_location(cp, cstart, cend, st, true, false);
2638 Disassembler::print_hexdata(cp, n, st, false);
2639 cp += n;
2640 n = bytes_per_line;
2641 st->cr();
2642 }
2643
2644 //---< Show potential alignment gap between constant pool and code >---
2645 cend = code_begin();
2646 if( cp < cend ) {
2647 n = 4;
2648 st->print_cr("[Code entry alignment]");
2649 while (cp < cend) {
2650 Disassembler::print_location(cp, cstart, cend, st, false, false);
2651 cp += n;
2652 st->cr();
2653 }
2654 }
2655 } else {
2656 st->print_cr("[Constant Pool (empty)]");
2657 }
2658 st->cr();
2659 }
2660
2661 #endif
2662
2663 // Disassemble this nmethod.
2664 // Print additional debug information, if requested. This could be code
2665 // comments, block comments, profiling counters, etc.
2666 // The undisassembled format is useful no disassembler library is available.
2667 // The resulting hex dump (with markers) can be disassembled later, or on
2668 // another system, when/where a disassembler library is available.
2669 void nmethod::decode2(outputStream* ost) const {
2670
2671 // Called from frame::back_trace_with_decode without ResourceMark.
2672 ResourceMark rm;
2673
2674 // Make sure we have a valid stream to print on.
2675 outputStream* st = ost ? ost : tty;
2676
2677 #if defined(SUPPORT_ABSTRACT_ASSEMBLY) && ! defined(SUPPORT_ASSEMBLY)
2678 const bool use_compressed_format = true;
2679 const bool compressed_with_comments = use_compressed_format && (AbstractDisassembler::show_comment() ||
2680 AbstractDisassembler::show_block_comment());
2681 #else
2682 const bool use_compressed_format = Disassembler::is_abstract();
2683 const bool compressed_with_comments = use_compressed_format && (AbstractDisassembler::show_comment() ||
2684 AbstractDisassembler::show_block_comment());
2685 #endif
2686
2687 // Decoding an nmethod can write to a PcDescCache (see PcDescCache::add_pc_desc)
2688 MACOS_AARCH64_ONLY(ThreadWXEnable wx(WXWrite, Thread::current());)
2689
2690 st->cr();
2691 this->print(st);
2692 st->cr();
2693
2694 #if defined(SUPPORT_ASSEMBLY)
2695 //----------------------------------
2696 //---< Print real disassembly >---
2697 //----------------------------------
2698 if (! use_compressed_format) {
2699 st->print_cr("[Disassembly]");
2700 Disassembler::decode(const_cast<nmethod*>(this), st);
2701 st->bol();
2702 st->print_cr("[/Disassembly]");
2703 return;
2704 }
2705 #endif
2706
2707 #if defined(SUPPORT_ABSTRACT_ASSEMBLY)
2708
2709 // Compressed undisassembled disassembly format.
2710 // The following status values are defined/supported:
2711 // = 0 - currently at bol() position, nothing printed yet on current line.
2712 // = 1 - currently at position after print_location().
2713 // > 1 - in the midst of printing instruction stream bytes.
2714 int compressed_format_idx = 0;
2715 int code_comment_column = 0;
2716 const int instr_maxlen = Assembler::instr_maxlen();
2717 const uint tabspacing = 8;
2718 unsigned char* start = this->code_begin();
2719 unsigned char* p = this->code_begin();
2720 unsigned char* end = this->code_end();
2721 unsigned char* pss = p; // start of a code section (used for offsets)
2722
2723 if ((start == NULL) || (end == NULL)) {
2724 st->print_cr("PrintAssembly not possible due to uninitialized section pointers");
2725 return;
2726 }
2727 #endif
2728
2729 #if defined(SUPPORT_ABSTRACT_ASSEMBLY)
2730 //---< plain abstract disassembly, no comments or anything, just section headers >---
2731 if (use_compressed_format && ! compressed_with_comments) {
2732 const_cast<nmethod*>(this)->print_constant_pool(st);
2733
2734 //---< Open the output (Marker for post-mortem disassembler) >---
2735 st->print_cr("[MachCode]");
2736 const char* header = NULL;
2737 address p0 = p;
2738 while (p < end) {
2739 address pp = p;
2740 while ((p < end) && (header == NULL)) {
2741 header = nmethod_section_label(p);
2742 pp = p;
2743 p += Assembler::instr_len(p);
2744 }
2745 if (pp > p0) {
2746 AbstractDisassembler::decode_range_abstract(p0, pp, start, end, st, Assembler::instr_maxlen());
2747 p0 = pp;
2748 p = pp;
2749 header = NULL;
2750 } else if (header != NULL) {
2751 st->bol();
2752 st->print_cr("%s", header);
2753 header = NULL;
2754 }
2755 }
2756 //---< Close the output (Marker for post-mortem disassembler) >---
2757 st->bol();
2758 st->print_cr("[/MachCode]");
2759 return;
2760 }
2761 #endif
2762
2763 #if defined(SUPPORT_ABSTRACT_ASSEMBLY)
2764 //---< abstract disassembly with comments and section headers merged in >---
2765 if (compressed_with_comments) {
2766 const_cast<nmethod*>(this)->print_constant_pool(st);
2767
2768 //---< Open the output (Marker for post-mortem disassembler) >---
2769 st->print_cr("[MachCode]");
2770 while ((p < end) && (p != NULL)) {
2771 const int instruction_size_in_bytes = Assembler::instr_len(p);
2772
2773 //---< Block comments for nmethod. Interrupts instruction stream, if any. >---
2774 // Outputs a bol() before and a cr() after, but only if a comment is printed.
2775 // Prints nmethod_section_label as well.
2776 if (AbstractDisassembler::show_block_comment()) {
2777 print_block_comment(st, p);
2778 if (st->position() == 0) {
2779 compressed_format_idx = 0;
2780 }
2781 }
2782
2783 //---< New location information after line break >---
2784 if (compressed_format_idx == 0) {
2785 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false);
2786 compressed_format_idx = 1;
2787 }
2788
2789 //---< Code comment for current instruction. Address range [p..(p+len)) >---
2790 unsigned char* p_end = p + (ssize_t)instruction_size_in_bytes;
2791 S390_ONLY(if (p_end > end) p_end = end;) // avoid getting past the end
2792
2793 if (AbstractDisassembler::show_comment() && const_cast<nmethod*>(this)->has_code_comment(p, p_end)) {
2794 //---< interrupt instruction byte stream for code comment >---
2795 if (compressed_format_idx > 1) {
2796 st->cr(); // interrupt byte stream
2797 st->cr(); // add an empty line
2798 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false);
2799 }
2800 const_cast<nmethod*>(this)->print_code_comment_on(st, code_comment_column, p, p_end );
2801 st->bol();
2802 compressed_format_idx = 0;
2803 }
2804
2805 //---< New location information after line break >---
2806 if (compressed_format_idx == 0) {
2807 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false);
2808 compressed_format_idx = 1;
2809 }
2810
2811 //---< Nicely align instructions for readability >---
2812 if (compressed_format_idx > 1) {
2813 Disassembler::print_delimiter(st);
2814 }
2815
2816 //---< Now, finally, print the actual instruction bytes >---
2817 unsigned char* p0 = p;
2818 p = Disassembler::decode_instruction_abstract(p, st, instruction_size_in_bytes, instr_maxlen);
2819 compressed_format_idx += p - p0;
2820
2821 if (Disassembler::start_newline(compressed_format_idx-1)) {
2822 st->cr();
2823 compressed_format_idx = 0;
2824 }
2825 }
2826 //---< Close the output (Marker for post-mortem disassembler) >---
2827 st->bol();
2828 st->print_cr("[/MachCode]");
2829 return;
2830 }
2831 #endif
2832 }
2833
2834 #if defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_ABSTRACT_ASSEMBLY)
2835
2836 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
2837 RelocIterator iter(this, begin, end);
2838 bool have_one = false;
2839 while (iter.next()) {
2840 have_one = true;
2841 switch (iter.type()) {
2842 case relocInfo::none: return "no_reloc";
2843 case relocInfo::oop_type: {
2844 // Get a non-resizable resource-allocated stringStream.
2845 // Our callees make use of (nested) ResourceMarks.
2846 stringStream st(NEW_RESOURCE_ARRAY(char, 1024), 1024);
2847 oop_Relocation* r = iter.oop_reloc();
2848 oop obj = r->oop_value();
2849 st.print("oop(");
2850 if (obj == NULL) st.print("NULL");
2851 else obj->print_value_on(&st);
2852 st.print(")");
2853 return st.as_string();
2854 }
2855 case relocInfo::metadata_type: {
2856 stringStream st;
2857 metadata_Relocation* r = iter.metadata_reloc();
2858 Metadata* obj = r->metadata_value();
2859 st.print("metadata(");
2860 if (obj == NULL) st.print("NULL");
2861 else obj->print_value_on(&st);
2862 st.print(")");
2863 return st.as_string();
2864 }
2865 case relocInfo::runtime_call_type:
2866 case relocInfo::runtime_call_w_cp_type: {
2867 stringStream st;
2868 st.print("runtime_call");
2869 CallRelocation* r = (CallRelocation*)iter.reloc();
2870 address dest = r->destination();
2871 CodeBlob* cb = CodeCache::find_blob(dest);
2872 if (cb != NULL) {
2873 st.print(" %s", cb->name());
2874 } else {
2875 ResourceMark rm;
2876 const int buflen = 1024;
2877 char* buf = NEW_RESOURCE_ARRAY(char, buflen);
2878 int offset;
2879 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) {
2880 st.print(" %s", buf);
2881 if (offset != 0) {
2882 st.print("+%d", offset);
2883 }
2884 }
2885 }
2886 return st.as_string();
2887 }
2888 case relocInfo::virtual_call_type: {
2889 stringStream st;
2890 st.print_raw("virtual_call");
2891 virtual_call_Relocation* r = iter.virtual_call_reloc();
2892 Method* m = r->method_value();
2893 if (m != NULL) {
2894 assert(m->is_method(), "");
2895 m->print_short_name(&st);
2896 }
2897 return st.as_string();
2898 }
2899 case relocInfo::opt_virtual_call_type: {
2900 stringStream st;
2901 st.print_raw("optimized virtual_call");
2902 opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc();
2903 Method* m = r->method_value();
2904 if (m != NULL) {
2905 assert(m->is_method(), "");
2906 m->print_short_name(&st);
2907 }
2908 return st.as_string();
2909 }
2910 case relocInfo::static_call_type: {
2911 stringStream st;
2912 st.print_raw("static_call");
2913 static_call_Relocation* r = iter.static_call_reloc();
2914 Method* m = r->method_value();
2915 if (m != NULL) {
2916 assert(m->is_method(), "");
2917 m->print_short_name(&st);
2918 }
2919 return st.as_string();
2920 }
2921 case relocInfo::static_stub_type: return "static_stub";
2922 case relocInfo::external_word_type: return "external_word";
2923 case relocInfo::internal_word_type: return "internal_word";
2924 case relocInfo::section_word_type: return "section_word";
2925 case relocInfo::poll_type: return "poll";
2926 case relocInfo::poll_return_type: return "poll_return";
2927 case relocInfo::trampoline_stub_type: return "trampoline_stub";
2928 case relocInfo::type_mask: return "type_bit_mask";
2929
2930 default:
2931 break;
2932 }
2933 }
2934 return have_one ? "other" : NULL;
2935 }
2936
2937 // Return the last scope in (begin..end]
2938 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
2939 PcDesc* p = pc_desc_near(begin+1);
2940 if (p != NULL && p->real_pc(this) <= end) {
2941 return new ScopeDesc(this, p);
2942 }
2943 return NULL;
2944 }
2945
2946 const char* nmethod::nmethod_section_label(address pos) const {
2947 const char* label = NULL;
2948 if (pos == code_begin()) label = "[Instructions begin]";
2949 if (pos == entry_point()) label = "[Entry Point]";
2950 if (pos == inline_entry_point()) label = "[Inline Entry Point]";
2951 if (pos == verified_entry_point()) label = "[Verified Entry Point]";
2952 if (pos == verified_inline_entry_point()) label = "[Verified Inline Entry Point]";
2953 if (pos == verified_inline_ro_entry_point()) label = "[Verified Inline Entry Point (RO)]";
2954 if (has_method_handle_invokes() && (pos == deopt_mh_handler_begin())) label = "[Deopt MH Handler Code]";
2955 if (pos == consts_begin() && pos != insts_begin()) label = "[Constants]";
2956 // Check stub_code before checking exception_handler or deopt_handler.
2957 if (pos == this->stub_begin()) label = "[Stub Code]";
2958 if (JVMCI_ONLY(_exception_offset >= 0 &&) pos == exception_begin()) label = "[Exception Handler]";
2959 if (JVMCI_ONLY(_deopt_handler_begin != NULL &&) pos == deopt_handler_begin()) label = "[Deopt Handler Code]";
2960 return label;
2961 }
2962
2963 static int maybe_print_entry_label(outputStream* stream, address pos, address entry, const char* label) {
2964 if (pos == entry) {
2965 stream->bol();
2966 stream->print_cr("%s", label);
2967 return 1;
2968 } else {
2969 return 0;
2970 }
2971 }
2972
2973 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin, bool print_section_labels) const {
2974 if (print_section_labels) {
2975 int n = 0;
2976 // Multiple entry points may be at the same position. Print them all.
2977 n += maybe_print_entry_label(stream, block_begin, entry_point(), "[Entry Point]");
2978 n += maybe_print_entry_label(stream, block_begin, inline_entry_point(), "[Inline Entry Point]");
2979 n += maybe_print_entry_label(stream, block_begin, verified_entry_point(), "[Verified Entry Point]");
2980 n += maybe_print_entry_label(stream, block_begin, verified_inline_entry_point(), "[Verified Inline Entry Point]");
2981 n += maybe_print_entry_label(stream, block_begin, verified_inline_ro_entry_point(), "[Verified Inline Entry Point (RO)]");
2982 if (n == 0) {
2983 const char* label = nmethod_section_label(block_begin);
2984 if (label != NULL) {
2985 stream->bol();
2986 stream->print_cr("%s", label);
2987 }
2988 }
2989 }
2990
2991 Method* m = method();
2992 if (m == NULL || is_osr_method()) {
2993 return;
2994 }
2995
2996 // Print the name of the method (only once)
2997 address low = MIN4(entry_point(), verified_entry_point(), verified_inline_entry_point(), verified_inline_ro_entry_point());
2998 low = MIN2(low, inline_entry_point());
2999 assert(low != 0, "sanity");
3000 if (block_begin == low) {
3001 stream->print(" # ");
3002 m->print_value_on(stream);
3003 stream->cr();
3004 }
3005
3006 // Print the arguments for the 3 types of verified entry points
3007 CompiledEntrySignature ces(m);
3008 ces.compute_calling_conventions();
3009 const GrowableArray<SigEntry>* sig_cc;
3010 const VMRegPair* regs;
3011 if (block_begin == verified_entry_point()) {
3012 sig_cc = &ces.sig_cc();
3013 regs = ces.regs_cc();
3014 } else if (block_begin == verified_inline_entry_point()) {
3015 sig_cc = &ces.sig();
3016 regs = ces.regs();
3017 } else if (block_begin == verified_inline_ro_entry_point()) {
3018 sig_cc = &ces.sig_cc_ro();
3019 regs = ces.regs_cc_ro();
3020 } else {
3021 return;
3022 }
3023
3024 bool has_this = !m->is_static();
3025 if (ces.has_inline_recv() && block_begin == verified_entry_point()) {
3026 // <this> argument is scalarized for verified_entry_point()
3027 has_this = false;
3028 }
3029 const char* spname = "sp"; // make arch-specific?
3030 int stack_slot_offset = this->frame_size() * wordSize;
3031 int tab1 = 14, tab2 = 24;
3032 int sig_index = 0;
3033 int arg_index = has_this ? -1 : 0;
3034 bool did_old_sp = false;
3035 for (ExtendedSignature sig = ExtendedSignature(sig_cc, SigEntryFilter()); !sig.at_end(); ++sig) {
3036 bool at_this = (arg_index == -1);
3037 bool at_old_sp = false;
3038 BasicType t = (*sig)._bt;
3039 if (at_this) {
3040 stream->print(" # this: ");
3041 } else {
3042 stream->print(" # parm%d: ", arg_index);
3043 }
3044 stream->move_to(tab1);
3045 VMReg fst = regs[sig_index].first();
3046 VMReg snd = regs[sig_index].second();
3047 if (fst->is_reg()) {
3048 stream->print("%s", fst->name());
3049 if (snd->is_valid()) {
3050 stream->print(":%s", snd->name());
3051 }
3052 } else if (fst->is_stack()) {
3053 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
3054 if (offset == stack_slot_offset) at_old_sp = true;
3055 stream->print("[%s+0x%x]", spname, offset);
3056 } else {
3057 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
3058 }
3059 stream->print(" ");
3060 stream->move_to(tab2);
3061 stream->print("= ");
3062 if (at_this) {
3063 m->method_holder()->print_value_on(stream);
3064 } else {
3065 bool did_name = false;
3066 if (is_reference_type(t)) {
3067 Symbol* name = (*sig)._symbol;
3068 name->print_value_on(stream);
3069 did_name = true;
3070 }
3071 if (!did_name)
3072 stream->print("%s", type2name(t));
3073 }
3074 if (at_old_sp) {
3075 stream->print(" (%s of caller)", spname);
3076 did_old_sp = true;
3077 }
3078 stream->cr();
3079 sig_index += type2size[t];
3080 arg_index += 1;
3081 }
3082 if (!did_old_sp) {
3083 stream->print(" # ");
3084 stream->move_to(tab1);
3085 stream->print("[%s+0x%x]", spname, stack_slot_offset);
3086 stream->print(" (%s of caller)", spname);
3087 stream->cr();
3088 }
3089 }
3090
3091 // Returns whether this nmethod has code comments.
3092 bool nmethod::has_code_comment(address begin, address end) {
3093 // scopes?
3094 ScopeDesc* sd = scope_desc_in(begin, end);
3095 if (sd != NULL) return true;
3096
3097 // relocations?
3098 const char* str = reloc_string_for(begin, end);
3099 if (str != NULL) return true;
3100
3101 // implicit exceptions?
3102 int cont_offset = ImplicitExceptionTable(this).continuation_offset(begin - code_begin());
3103 if (cont_offset != 0) return true;
3104
3105 return false;
3106 }
3107
3108 void nmethod::print_code_comment_on(outputStream* st, int column, address begin, address end) {
3109 ImplicitExceptionTable implicit_table(this);
3110 int pc_offset = begin - code_begin();
3111 int cont_offset = implicit_table.continuation_offset(pc_offset);
3112 bool oop_map_required = false;
3113 if (cont_offset != 0) {
3114 st->move_to(column, 6, 0);
3115 if (pc_offset == cont_offset) {
3116 st->print("; implicit exception: deoptimizes");
3117 oop_map_required = true;
3118 } else {
3119 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset));
3120 }
3121 }
3122
3123 // Find an oopmap in (begin, end]. We use the odd half-closed
3124 // interval so that oop maps and scope descs which are tied to the
3125 // byte after a call are printed with the call itself. OopMaps
3126 // associated with implicit exceptions are printed with the implicit
3127 // instruction.
3128 address base = code_begin();
3129 ImmutableOopMapSet* oms = oop_maps();
3130 if (oms != NULL) {
3131 for (int i = 0, imax = oms->count(); i < imax; i++) {
3132 const ImmutableOopMapPair* pair = oms->pair_at(i);
3133 const ImmutableOopMap* om = pair->get_from(oms);
3134 address pc = base + pair->pc_offset();
3135 if (pc >= begin) {
3136 #if INCLUDE_JVMCI
3137 bool is_implicit_deopt = implicit_table.continuation_offset(pair->pc_offset()) == (uint) pair->pc_offset();
3138 #else
3139 bool is_implicit_deopt = false;
3140 #endif
3141 if (is_implicit_deopt ? pc == begin : pc > begin && pc <= end) {
3142 st->move_to(column, 6, 0);
3143 st->print("; ");
3144 om->print_on(st);
3145 oop_map_required = false;
3146 }
3147 }
3148 if (pc > end) {
3149 break;
3150 }
3151 }
3152 }
3153 assert(!oop_map_required, "missed oopmap");
3154
3155 Thread* thread = Thread::current();
3156
3157 // Print any debug info present at this pc.
3158 ScopeDesc* sd = scope_desc_in(begin, end);
3159 if (sd != NULL) {
3160 st->move_to(column, 6, 0);
3161 if (sd->bci() == SynchronizationEntryBCI) {
3162 st->print(";*synchronization entry");
3163 } else if (sd->bci() == AfterBci) {
3164 st->print(";* method exit (unlocked if synchronized)");
3165 } else if (sd->bci() == UnwindBci) {
3166 st->print(";* unwind (locked if synchronized)");
3167 } else if (sd->bci() == AfterExceptionBci) {
3168 st->print(";* unwind (unlocked if synchronized)");
3169 } else if (sd->bci() == UnknownBci) {
3170 st->print(";* unknown");
3171 } else if (sd->bci() == InvalidFrameStateBci) {
3172 st->print(";* invalid frame state");
3173 } else {
3174 if (sd->method() == NULL) {
3175 st->print("method is NULL");
3176 } else if (sd->method()->is_native()) {
3177 st->print("method is native");
3178 } else {
3179 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci());
3180 st->print(";*%s", Bytecodes::name(bc));
3181 switch (bc) {
3182 case Bytecodes::_invokevirtual:
3183 case Bytecodes::_invokespecial:
3184 case Bytecodes::_invokestatic:
3185 case Bytecodes::_invokeinterface:
3186 {
3187 Bytecode_invoke invoke(methodHandle(thread, sd->method()), sd->bci());
3188 st->print(" ");
3189 if (invoke.name() != NULL)
3190 invoke.name()->print_symbol_on(st);
3191 else
3192 st->print("<UNKNOWN>");
3193 break;
3194 }
3195 case Bytecodes::_getfield:
3196 case Bytecodes::_putfield:
3197 case Bytecodes::_getstatic:
3198 case Bytecodes::_putstatic:
3199 {
3200 Bytecode_field field(methodHandle(thread, sd->method()), sd->bci());
3201 st->print(" ");
3202 if (field.name() != NULL)
3203 field.name()->print_symbol_on(st);
3204 else
3205 st->print("<UNKNOWN>");
3206 }
3207 default:
3208 break;
3209 }
3210 }
3211 st->print(" {reexecute=%d rethrow=%d return_oop=%d return_scalarized=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop(), sd->return_scalarized());
3212 }
3213
3214 // Print all scopes
3215 for (;sd != NULL; sd = sd->sender()) {
3216 st->move_to(column, 6, 0);
3217 st->print("; -");
3218 if (sd->should_reexecute()) {
3219 st->print(" (reexecute)");
3220 }
3221 if (sd->method() == NULL) {
3222 st->print("method is NULL");
3223 } else {
3224 sd->method()->print_short_name(st);
3225 }
3226 int lineno = sd->method()->line_number_from_bci(sd->bci());
3227 if (lineno != -1) {
3228 st->print("@%d (line %d)", sd->bci(), lineno);
3229 } else {
3230 st->print("@%d", sd->bci());
3231 }
3232 st->cr();
3233 }
3234 }
3235
3236 // Print relocation information
3237 // Prevent memory leak: allocating without ResourceMark.
3238 ResourceMark rm;
3239 const char* str = reloc_string_for(begin, end);
3240 if (str != NULL) {
3241 if (sd != NULL) st->cr();
3242 st->move_to(column, 6, 0);
3243 st->print("; {%s}", str);
3244 }
3245 }
3246
3247 #endif
3248
3249 class DirectNativeCallWrapper: public NativeCallWrapper {
3250 private:
3251 NativeCall* _call;
3252
3253 public:
3254 DirectNativeCallWrapper(NativeCall* call) : _call(call) {}
3255
3256 virtual address destination() const { return _call->destination(); }
3257 virtual address instruction_address() const { return _call->instruction_address(); }
3258 virtual address next_instruction_address() const { return _call->next_instruction_address(); }
3259 virtual address return_address() const { return _call->return_address(); }
3260
3261 virtual address get_resolve_call_stub(bool is_optimized) const {
3262 if (is_optimized) {
3263 return SharedRuntime::get_resolve_opt_virtual_call_stub();
3264 }
3265 return SharedRuntime::get_resolve_virtual_call_stub();
3266 }
3267
3268 virtual void set_destination_mt_safe(address dest) {
3269 _call->set_destination_mt_safe(dest);
3270 }
3271
3272 virtual void set_to_interpreted(const methodHandle& method, CompiledICInfo& info) {
3273 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address());
3274 {
3275 csc->set_to_interpreted(method, info.entry());
3276 }
3277 }
3278
3279 virtual void verify() const {
3280 // make sure code pattern is actually a call imm32 instruction
3281 _call->verify();
3282 _call->verify_alignment();
3283 }
3284
3285 virtual void verify_resolve_call(address dest) const {
3286 CodeBlob* db = CodeCache::find_blob(dest);
3287 assert(db != NULL && !db->is_adapter_blob(), "must use stub!");
3288 }
3289
3290 virtual bool is_call_to_interpreted(address dest) const {
3291 CodeBlob* cb = CodeCache::find_blob(_call->instruction_address());
3292 return cb->contains(dest);
3293 }
3294
3295 virtual bool is_safe_for_patching() const { return false; }
3296
3297 virtual NativeInstruction* get_load_instruction(virtual_call_Relocation* r) const {
3298 return nativeMovConstReg_at(r->cached_value());
3299 }
3300
3301 virtual void *get_data(NativeInstruction* instruction) const {
3302 return (void*)((NativeMovConstReg*) instruction)->data();
3303 }
3304
3305 virtual void set_data(NativeInstruction* instruction, intptr_t data) {
3306 ((NativeMovConstReg*) instruction)->set_data(data);
3307 }
3308 };
3309
3310 NativeCallWrapper* nmethod::call_wrapper_at(address call) const {
3311 return new DirectNativeCallWrapper((NativeCall*) call);
3312 }
3313
3314 NativeCallWrapper* nmethod::call_wrapper_before(address return_pc) const {
3315 return new DirectNativeCallWrapper(nativeCall_before(return_pc));
3316 }
3317
3318 address nmethod::call_instruction_address(address pc) const {
3319 if (NativeCall::is_call_before(pc)) {
3320 NativeCall *ncall = nativeCall_before(pc);
3321 return ncall->instruction_address();
3322 }
3323 return NULL;
3324 }
3325
3326 CompiledStaticCall* nmethod::compiledStaticCall_at(Relocation* call_site) const {
3327 return CompiledDirectStaticCall::at(call_site);
3328 }
3329
3330 CompiledStaticCall* nmethod::compiledStaticCall_at(address call_site) const {
3331 return CompiledDirectStaticCall::at(call_site);
3332 }
3333
3334 CompiledStaticCall* nmethod::compiledStaticCall_before(address return_addr) const {
3335 return CompiledDirectStaticCall::before(return_addr);
3336 }
3337
3338 #if defined(SUPPORT_DATA_STRUCTS)
3339 void nmethod::print_value_on(outputStream* st) const {
3340 st->print("nmethod");
3341 print_on(st, NULL);
3342 }
3343 #endif
3344
3345 #ifndef PRODUCT
3346
3347 void nmethod::print_calls(outputStream* st) {
3348 RelocIterator iter(this);
3349 while (iter.next()) {
3350 switch (iter.type()) {
3351 case relocInfo::virtual_call_type:
3352 case relocInfo::opt_virtual_call_type: {
3353 CompiledICLocker ml_verify(this);
3354 CompiledIC_at(&iter)->print();
3355 break;
3356 }
3357 case relocInfo::static_call_type:
3358 st->print_cr("Static call at " INTPTR_FORMAT, p2i(iter.reloc()->addr()));
3359 CompiledDirectStaticCall::at(iter.reloc())->print();
3360 break;
3361 default:
3362 break;
3363 }
3364 }
3365 }
3366
3367 void nmethod::print_statistics() {
3368 ttyLocker ttyl;
3369 if (xtty != NULL) xtty->head("statistics type='nmethod'");
3370 native_nmethod_stats.print_native_nmethod_stats();
3371 #ifdef COMPILER1
3372 c1_java_nmethod_stats.print_nmethod_stats("C1");
3373 #endif
3374 #ifdef COMPILER2
3375 c2_java_nmethod_stats.print_nmethod_stats("C2");
3376 #endif
3377 #if INCLUDE_JVMCI
3378 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI");
3379 #endif
3380 unknown_java_nmethod_stats.print_nmethod_stats("Unknown");
3381 DebugInformationRecorder::print_statistics();
3382 #ifndef PRODUCT
3383 pc_nmethod_stats.print_pc_stats();
3384 #endif
3385 Dependencies::print_statistics();
3386 if (xtty != NULL) xtty->tail("statistics");
3387 }
3388
3389 #endif // !PRODUCT
3390
3391 #if INCLUDE_JVMCI
3392 void nmethod::update_speculation(JavaThread* thread) {
3393 jlong speculation = thread->pending_failed_speculation();
3394 if (speculation != 0) {
3395 guarantee(jvmci_nmethod_data() != NULL, "failed speculation in nmethod without failed speculation list");
3396 jvmci_nmethod_data()->add_failed_speculation(this, speculation);
3397 thread->set_pending_failed_speculation(0);
3398 }
3399 }
3400
3401 const char* nmethod::jvmci_name() {
3402 if (jvmci_nmethod_data() != NULL) {
3403 return jvmci_nmethod_data()->name();
3404 }
3405 return NULL;
3406 }
3407 #endif