1 /*
2 * Copyright (c) 1997, 2021, 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/compileBroker.hpp"
37 #include "compiler/compileLog.hpp"
38 #include "compiler/compilerDirectives.hpp"
39 #include "compiler/directivesParser.hpp"
40 #include "compiler/disassembler.hpp"
41 #include "compiler/oopMap.hpp"
42 #include "gc/shared/collectedHeap.hpp"
43 #include "interpreter/bytecode.hpp"
44 #include "logging/log.hpp"
45 #include "logging/logStream.hpp"
46 #include "memory/allocation.inline.hpp"
47 #include "memory/resourceArea.hpp"
48 #include "memory/universe.hpp"
49 #include "oops/access.inline.hpp"
50 #include "oops/klass.inline.hpp"
51 #include "oops/method.inline.hpp"
52 #include "oops/methodData.hpp"
53 #include "oops/oop.inline.hpp"
54 #include "prims/jvmtiImpl.hpp"
55 #include "prims/jvmtiThreadState.hpp"
56 #include "prims/methodHandles.hpp"
57 #include "runtime/atomic.hpp"
58 #include "runtime/deoptimization.hpp"
59 #include "runtime/flags/flagSetting.hpp"
60 #include "runtime/frame.inline.hpp"
61 #include "runtime/handles.inline.hpp"
62 #include "runtime/jniHandles.inline.hpp"
63 #include "runtime/orderAccess.hpp"
64 #include "runtime/os.hpp"
65 #include "runtime/safepointVerifiers.hpp"
66 #include "runtime/serviceThread.hpp"
67 #include "runtime/sharedRuntime.hpp"
68 #include "runtime/signature.hpp"
69 #include "runtime/sweeper.hpp"
70 #include "runtime/vmThread.hpp"
71 #include "utilities/align.hpp"
72 #include "utilities/copy.hpp"
73 #include "utilities/dtrace.hpp"
74 #include "utilities/events.hpp"
75 #include "utilities/globalDefinitions.hpp"
76 #include "utilities/resourceHash.hpp"
77 #include "utilities/xmlstream.hpp"
78 #if INCLUDE_JVMCI
79 #include "jvmci/jvmciRuntime.hpp"
80 #endif
81
82 #ifdef DTRACE_ENABLED
83
84 // Only bother with this argument setup if dtrace is available
85
86 #define DTRACE_METHOD_UNLOAD_PROBE(method) \
87 { \
88 Method* m = (method); \
89 if (m != NULL) { \
90 Symbol* klass_name = m->klass_name(); \
91 Symbol* name = m->name(); \
92 Symbol* signature = m->signature(); \
93 HOTSPOT_COMPILED_METHOD_UNLOAD( \
94 (char *) klass_name->bytes(), klass_name->utf8_length(), \
95 (char *) name->bytes(), name->utf8_length(), \
96 (char *) signature->bytes(), signature->utf8_length()); \
97 } \
98 }
99
100 #else // ndef DTRACE_ENABLED
101
102 #define DTRACE_METHOD_UNLOAD_PROBE(method)
103
104 #endif
105
106 //---------------------------------------------------------------------------------
107 // NMethod statistics
108 // They are printed under various flags, including:
109 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation.
110 // (In the latter two cases, they like other stats are printed to the log only.)
111
112 #ifndef PRODUCT
113 // These variables are put into one block to reduce relocations
114 // and make it simpler to print from the debugger.
115 struct java_nmethod_stats_struct {
116 int nmethod_count;
117 int total_size;
118 int relocation_size;
119 int consts_size;
120 int insts_size;
121 int stub_size;
122 int scopes_data_size;
123 int scopes_pcs_size;
124 int dependencies_size;
125 int handler_table_size;
126 int nul_chk_table_size;
127 #if INCLUDE_JVMCI
128 int speculations_size;
129 int jvmci_data_size;
130 #endif
131 int oops_size;
132 int metadata_size;
133
134 void note_nmethod(nmethod* nm) {
135 nmethod_count += 1;
136 total_size += nm->size();
137 relocation_size += nm->relocation_size();
138 consts_size += nm->consts_size();
139 insts_size += nm->insts_size();
140 stub_size += nm->stub_size();
141 oops_size += nm->oops_size();
142 metadata_size += nm->metadata_size();
143 scopes_data_size += nm->scopes_data_size();
144 scopes_pcs_size += nm->scopes_pcs_size();
145 dependencies_size += nm->dependencies_size();
146 handler_table_size += nm->handler_table_size();
147 nul_chk_table_size += nm->nul_chk_table_size();
148 #if INCLUDE_JVMCI
149 speculations_size += nm->speculations_size();
150 jvmci_data_size += nm->jvmci_data_size();
151 #endif
152 }
153 void print_nmethod_stats(const char* name) {
154 if (nmethod_count == 0) return;
155 tty->print_cr("Statistics for %d bytecoded nmethods for %s:", nmethod_count, name);
156 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size);
157 if (nmethod_count != 0) tty->print_cr(" header = " SIZE_FORMAT, nmethod_count * sizeof(nmethod));
158 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size);
159 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size);
160 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size);
161 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size);
162 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size);
163 if (metadata_size != 0) tty->print_cr(" metadata = %d", metadata_size);
164 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size);
165 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size);
166 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size);
167 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size);
168 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size);
169 #if INCLUDE_JVMCI
170 if (speculations_size != 0) tty->print_cr(" speculations = %d", speculations_size);
171 if (jvmci_data_size != 0) tty->print_cr(" JVMCI data = %d", jvmci_data_size);
172 #endif
173 }
174 };
175
176 struct native_nmethod_stats_struct {
177 int native_nmethod_count;
178 int native_total_size;
179 int native_relocation_size;
180 int native_insts_size;
181 int native_oops_size;
182 int native_metadata_size;
183 void note_native_nmethod(nmethod* nm) {
184 native_nmethod_count += 1;
185 native_total_size += nm->size();
186 native_relocation_size += nm->relocation_size();
187 native_insts_size += nm->insts_size();
188 native_oops_size += nm->oops_size();
189 native_metadata_size += nm->metadata_size();
190 }
191 void print_native_nmethod_stats() {
192 if (native_nmethod_count == 0) return;
193 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count);
194 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size);
195 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size);
196 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size);
197 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size);
198 if (native_metadata_size != 0) tty->print_cr(" N. metadata = %d", native_metadata_size);
199 }
200 };
201
202 struct pc_nmethod_stats_struct {
203 int pc_desc_resets; // number of resets (= number of caches)
204 int pc_desc_queries; // queries to nmethod::find_pc_desc
205 int pc_desc_approx; // number of those which have approximate true
206 int pc_desc_repeats; // number of _pc_descs[0] hits
207 int pc_desc_hits; // number of LRU cache hits
208 int pc_desc_tests; // total number of PcDesc examinations
209 int pc_desc_searches; // total number of quasi-binary search steps
210 int pc_desc_adds; // number of LUR cache insertions
211
212 void print_pc_stats() {
213 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query",
214 pc_desc_queries,
215 (double)(pc_desc_tests + pc_desc_searches)
216 / pc_desc_queries);
217 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d",
218 pc_desc_resets,
219 pc_desc_queries, pc_desc_approx,
220 pc_desc_repeats, pc_desc_hits,
221 pc_desc_tests, pc_desc_searches, pc_desc_adds);
222 }
223 };
224
225 #ifdef COMPILER1
226 static java_nmethod_stats_struct c1_java_nmethod_stats;
227 #endif
228 #ifdef COMPILER2
229 static java_nmethod_stats_struct c2_java_nmethod_stats;
230 #endif
231 #if INCLUDE_JVMCI
232 static java_nmethod_stats_struct jvmci_java_nmethod_stats;
233 #endif
234 static java_nmethod_stats_struct unknown_java_nmethod_stats;
235
236 static native_nmethod_stats_struct native_nmethod_stats;
237 static pc_nmethod_stats_struct pc_nmethod_stats;
238
239 static void note_java_nmethod(nmethod* nm) {
240 #ifdef COMPILER1
241 if (nm->is_compiled_by_c1()) {
242 c1_java_nmethod_stats.note_nmethod(nm);
243 } else
244 #endif
245 #ifdef COMPILER2
246 if (nm->is_compiled_by_c2()) {
247 c2_java_nmethod_stats.note_nmethod(nm);
248 } else
249 #endif
250 #if INCLUDE_JVMCI
251 if (nm->is_compiled_by_jvmci()) {
252 jvmci_java_nmethod_stats.note_nmethod(nm);
253 } else
254 #endif
255 {
256 unknown_java_nmethod_stats.note_nmethod(nm);
257 }
258 }
259 #endif // !PRODUCT
260
261 //---------------------------------------------------------------------------------
262
263
264 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) {
265 assert(pc != NULL, "Must be non null");
266 assert(exception.not_null(), "Must be non null");
267 assert(handler != NULL, "Must be non null");
268
269 _count = 0;
270 _exception_type = exception->klass();
271 _next = NULL;
272 _purge_list_next = NULL;
273
274 add_address_and_handler(pc,handler);
275 }
276
277
278 address ExceptionCache::match(Handle exception, address pc) {
279 assert(pc != NULL,"Must be non null");
280 assert(exception.not_null(),"Must be non null");
281 if (exception->klass() == exception_type()) {
282 return (test_address(pc));
283 }
284
285 return NULL;
286 }
287
288
289 bool ExceptionCache::match_exception_with_space(Handle exception) {
290 assert(exception.not_null(),"Must be non null");
291 if (exception->klass() == exception_type() && count() < cache_size) {
292 return true;
293 }
294 return false;
295 }
296
297
298 address ExceptionCache::test_address(address addr) {
299 int limit = count();
300 for (int i = 0; i < limit; i++) {
301 if (pc_at(i) == addr) {
302 return handler_at(i);
303 }
304 }
305 return NULL;
306 }
307
308
309 bool ExceptionCache::add_address_and_handler(address addr, address handler) {
310 if (test_address(addr) == handler) return true;
311
312 int index = count();
313 if (index < cache_size) {
314 set_pc_at(index, addr);
315 set_handler_at(index, handler);
316 increment_count();
317 return true;
318 }
319 return false;
320 }
321
322 ExceptionCache* ExceptionCache::next() {
323 return Atomic::load(&_next);
324 }
325
326 void ExceptionCache::set_next(ExceptionCache *ec) {
327 Atomic::store(&_next, ec);
328 }
329
330 //-----------------------------------------------------------------------------
331
332
333 // Helper used by both find_pc_desc methods.
334 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) {
335 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_tests);
336 if (!approximate)
337 return pc->pc_offset() == pc_offset;
338 else
339 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset();
340 }
341
342 void PcDescCache::reset_to(PcDesc* initial_pc_desc) {
343 if (initial_pc_desc == NULL) {
344 _pc_descs[0] = NULL; // native method; no PcDescs at all
345 return;
346 }
347 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_resets);
348 // reset the cache by filling it with benign (non-null) values
349 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel");
350 for (int i = 0; i < cache_size; i++)
351 _pc_descs[i] = initial_pc_desc;
352 }
353
354 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) {
355 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_queries);
356 NOT_PRODUCT(if (approximate) ++pc_nmethod_stats.pc_desc_approx);
357
358 // Note: one might think that caching the most recently
359 // read value separately would be a win, but one would be
360 // wrong. When many threads are updating it, the cache
361 // line it's in would bounce between caches, negating
362 // any benefit.
363
364 // In order to prevent race conditions do not load cache elements
365 // repeatedly, but use a local copy:
366 PcDesc* res;
367
368 // Step one: Check the most recently added value.
369 res = _pc_descs[0];
370 if (res == NULL) return NULL; // native method; no PcDescs at all
371 if (match_desc(res, pc_offset, approximate)) {
372 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_repeats);
373 return res;
374 }
375
376 // Step two: Check the rest of the LRU cache.
377 for (int i = 1; i < cache_size; ++i) {
378 res = _pc_descs[i];
379 if (res->pc_offset() < 0) break; // optimization: skip empty cache
380 if (match_desc(res, pc_offset, approximate)) {
381 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_hits);
382 return res;
383 }
384 }
385
386 // Report failure.
387 return NULL;
388 }
389
390 void PcDescCache::add_pc_desc(PcDesc* pc_desc) {
391 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_adds);
392 // Update the LRU cache by shifting pc_desc forward.
393 for (int i = 0; i < cache_size; i++) {
394 PcDesc* next = _pc_descs[i];
395 _pc_descs[i] = pc_desc;
396 pc_desc = next;
397 }
398 }
399
400 // adjust pcs_size so that it is a multiple of both oopSize and
401 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple
402 // of oopSize, then 2*sizeof(PcDesc) is)
403 static int adjust_pcs_size(int pcs_size) {
404 int nsize = align_up(pcs_size, oopSize);
405 if ((nsize % sizeof(PcDesc)) != 0) {
406 nsize = pcs_size + sizeof(PcDesc);
407 }
408 assert((nsize % oopSize) == 0, "correct alignment");
409 return nsize;
410 }
411
412
413 int nmethod::total_size() const {
414 return
415 consts_size() +
416 insts_size() +
417 stub_size() +
418 scopes_data_size() +
419 scopes_pcs_size() +
420 handler_table_size() +
421 nul_chk_table_size();
422 }
423
424 address* nmethod::orig_pc_addr(const frame* fr) {
425 return (address*) ((address)fr->unextended_sp() + _orig_pc_offset);
426 }
427
428 const char* nmethod::compile_kind() const {
429 if (is_osr_method()) return "osr";
430 if (method() != NULL && is_native_method()) return "c2n";
431 return NULL;
432 }
433
434 // Fill in default values for various flag fields
435 void nmethod::init_defaults() {
436 _state = not_installed;
437 _has_flushed_dependencies = 0;
438 _lock_count = 0;
439 _stack_traversal_mark = 0;
440 _load_reported = false; // jvmti state
441 _unload_reported = false;
442
443 #ifdef ASSERT
444 _oops_are_stale = false;
445 #endif
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 code_buffer->finalize_oop_references(method);
464 // create nmethod
465 nmethod* nm = NULL;
466 {
467 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
468 int native_nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod));
469
470 CodeOffsets offsets;
471 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
472 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
473 nm = new (native_nmethod_size, CompLevel_none)
474 nmethod(method(), compiler_none, native_nmethod_size,
475 compile_id, &offsets,
476 code_buffer, frame_size,
477 basic_lock_owner_sp_offset,
478 basic_lock_sp_offset,
479 oop_maps);
480 NOT_PRODUCT(if (nm != NULL) native_nmethod_stats.note_native_nmethod(nm));
481 }
482
483 if (nm != NULL) {
484 // verify nmethod
485 debug_only(nm->verify();) // might block
486
487 nm->log_new_nmethod();
488 }
489 return nm;
490 }
491
492 nmethod* nmethod::new_nmethod(const methodHandle& method,
493 int compile_id,
494 int entry_bci,
495 CodeOffsets* offsets,
496 int orig_pc_offset,
497 DebugInformationRecorder* debug_info,
498 Dependencies* dependencies,
499 CodeBuffer* code_buffer, int frame_size,
500 OopMapSet* oop_maps,
501 ExceptionHandlerTable* handler_table,
502 ImplicitExceptionTable* nul_chk_table,
503 AbstractCompiler* compiler,
504 int comp_level,
505 const GrowableArrayView<RuntimeStub*>& native_invokers
506 #if INCLUDE_JVMCI
507 , char* speculations,
508 int speculations_len,
509 int nmethod_mirror_index,
510 const char* nmethod_mirror_name,
511 FailedSpeculation** failed_speculations
512 #endif
513 )
514 {
515 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
516 code_buffer->finalize_oop_references(method);
517 // create nmethod
518 nmethod* nm = NULL;
519 { MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
520 #if INCLUDE_JVMCI
521 int jvmci_data_size = !compiler->is_jvmci() ? 0 : JVMCINMethodData::compute_size(nmethod_mirror_name);
522 #endif
523 int nmethod_size =
524 CodeBlob::allocation_size(code_buffer, sizeof(nmethod))
525 + adjust_pcs_size(debug_info->pcs_size())
526 + align_up((int)dependencies->size_in_bytes(), oopSize)
527 + align_up(checked_cast<int>(native_invokers.data_size_in_bytes()), oopSize)
528 + align_up(handler_table->size_in_bytes() , oopSize)
529 + align_up(nul_chk_table->size_in_bytes() , oopSize)
530 #if INCLUDE_JVMCI
531 + align_up(speculations_len , oopSize)
532 + align_up(jvmci_data_size , oopSize)
533 #endif
534 + align_up(debug_info->data_size() , oopSize);
535
536 nm = new (nmethod_size, comp_level)
537 nmethod(method(), compiler->type(), nmethod_size, compile_id, entry_bci, offsets,
538 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size,
539 oop_maps,
540 handler_table,
541 nul_chk_table,
542 compiler,
543 comp_level,
544 native_invokers
545 #if INCLUDE_JVMCI
546 , speculations,
547 speculations_len,
548 jvmci_data_size
549 #endif
550 );
551
552 if (nm != NULL) {
553 #if INCLUDE_JVMCI
554 if (compiler->is_jvmci()) {
555 // Initialize the JVMCINMethodData object inlined into nm
556 nm->jvmci_nmethod_data()->initialize(nmethod_mirror_index, nmethod_mirror_name, failed_speculations);
557 }
558 #endif
559 // To make dependency checking during class loading fast, record
560 // the nmethod dependencies in the classes it is dependent on.
561 // This allows the dependency checking code to simply walk the
562 // class hierarchy above the loaded class, checking only nmethods
563 // which are dependent on those classes. The slow way is to
564 // check every nmethod for dependencies which makes it linear in
565 // the number of methods compiled. For applications with a lot
566 // classes the slow way is too slow.
567 for (Dependencies::DepStream deps(nm); deps.next(); ) {
568 if (deps.type() == Dependencies::call_site_target_value) {
569 // CallSite dependencies are managed on per-CallSite instance basis.
570 oop call_site = deps.argument_oop(0);
571 MethodHandles::add_dependent_nmethod(call_site, nm);
572 } else {
573 Klass* klass = deps.context_type();
574 if (klass == NULL) {
575 continue; // ignore things like evol_method
576 }
577 // record this nmethod as dependent on this klass
578 InstanceKlass::cast(klass)->add_dependent_nmethod(nm);
579 }
580 }
581 NOT_PRODUCT(if (nm != NULL) note_java_nmethod(nm));
582 }
583 }
584 // Do verification and logging outside CodeCache_lock.
585 if (nm != NULL) {
586 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
587 DEBUG_ONLY(nm->verify();)
588 nm->log_new_nmethod();
589 }
590 return nm;
591 }
592
593 // For native wrappers
594 nmethod::nmethod(
595 Method* method,
596 CompilerType type,
597 int nmethod_size,
598 int compile_id,
599 CodeOffsets* offsets,
600 CodeBuffer* code_buffer,
601 int frame_size,
602 ByteSize basic_lock_owner_sp_offset,
603 ByteSize basic_lock_sp_offset,
604 OopMapSet* oop_maps )
605 : CompiledMethod(method, "native nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false),
606 _is_unloading_state(0),
607 _native_receiver_sp_offset(basic_lock_owner_sp_offset),
608 _native_basic_lock_sp_offset(basic_lock_sp_offset)
609 {
610 {
611 int scopes_data_offset = 0;
612 int deoptimize_offset = 0;
613 int deoptimize_mh_offset = 0;
614
615 debug_only(NoSafepointVerifier nsv;)
616 assert_locked_or_safepoint(CodeCache_lock);
617
618 init_defaults();
619 _entry_bci = InvocationEntryBci;
620 // We have no exception handler or deopt handler make the
621 // values something that will never match a pc like the nmethod vtable entry
622 _exception_offset = 0;
623 _orig_pc_offset = 0;
624
625 _consts_offset = data_offset();
626 _stub_offset = data_offset();
627 _oops_offset = data_offset();
628 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize);
629 scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize);
630 _scopes_pcs_offset = scopes_data_offset;
631 _dependencies_offset = _scopes_pcs_offset;
632 _native_invokers_offset = _dependencies_offset;
633 _handler_table_offset = _native_invokers_offset;
634 _nul_chk_table_offset = _handler_table_offset;
635 #if INCLUDE_JVMCI
636 _speculations_offset = _nul_chk_table_offset;
637 _jvmci_data_offset = _speculations_offset;
638 _nmethod_end_offset = _jvmci_data_offset;
639 #else
640 _nmethod_end_offset = _nul_chk_table_offset;
641 #endif
642 _compile_id = compile_id;
643 _comp_level = CompLevel_none;
644 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
645 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
646
647 assert(!method->has_scalarized_args(), "scalarized native wrappers not supported yet"); // for the next 3 fields
648 _inline_entry_point = _entry_point;
649 _verified_inline_entry_point = _verified_entry_point;
650 _verified_inline_ro_entry_point = _verified_entry_point;
651
652 _osr_entry_point = NULL;
653 _exception_cache = NULL;
654 _pc_desc_container.reset_to(NULL);
655 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
656
657 _scopes_data_begin = (address) this + scopes_data_offset;
658 _deopt_handler_begin = (address) this + deoptimize_offset;
659 _deopt_mh_handler_begin = (address) this + deoptimize_mh_offset;
660
661 code_buffer->copy_code_and_locs_to(this);
662 code_buffer->copy_values_to(this);
663
664 clear_unloading_state();
665
666 Universe::heap()->register_nmethod(this);
667 debug_only(Universe::heap()->verify_nmethod(this));
668
669 CodeCache::commit(this);
670 }
671
672 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
673 ttyLocker ttyl; // keep the following output all in one block
674 // This output goes directly to the tty, not the compiler log.
675 // To enable tools to match it up with the compilation activity,
676 // be sure to tag this tty output with the compile ID.
677 if (xtty != NULL) {
678 xtty->begin_head("print_native_nmethod");
679 xtty->method(_method);
680 xtty->stamp();
681 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
682 }
683 // Print the header part, then print the requested information.
684 // This is both handled in decode2(), called via print_code() -> decode()
685 if (PrintNativeNMethods) {
686 tty->print_cr("-------------------------- Assembly (native nmethod) ---------------------------");
687 print_code();
688 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
689 #if defined(SUPPORT_DATA_STRUCTS)
690 if (AbstractDisassembler::show_structs()) {
691 if (oop_maps != NULL) {
692 tty->print("oop maps:"); // oop_maps->print_on(tty) outputs a cr() at the beginning
693 oop_maps->print_on(tty);
694 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
695 }
696 }
697 #endif
698 } else {
699 print(); // print the header part only.
700 }
701 #if defined(SUPPORT_DATA_STRUCTS)
702 if (AbstractDisassembler::show_structs()) {
703 if (PrintRelocations) {
704 print_relocations();
705 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
706 }
707 }
708 #endif
709 if (xtty != NULL) {
710 xtty->tail("print_native_nmethod");
711 }
712 }
713 }
714
715 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () {
716 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level));
717 }
718
719 nmethod::nmethod(
720 Method* method,
721 CompilerType type,
722 int nmethod_size,
723 int compile_id,
724 int entry_bci,
725 CodeOffsets* offsets,
726 int orig_pc_offset,
727 DebugInformationRecorder* debug_info,
728 Dependencies* dependencies,
729 CodeBuffer *code_buffer,
730 int frame_size,
731 OopMapSet* oop_maps,
732 ExceptionHandlerTable* handler_table,
733 ImplicitExceptionTable* nul_chk_table,
734 AbstractCompiler* compiler,
735 int comp_level,
736 const GrowableArrayView<RuntimeStub*>& native_invokers
737 #if INCLUDE_JVMCI
738 , char* speculations,
739 int speculations_len,
740 int jvmci_data_size
741 #endif
742 )
743 : CompiledMethod(method, "nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false),
744 _is_unloading_state(0),
745 _native_receiver_sp_offset(in_ByteSize(-1)),
746 _native_basic_lock_sp_offset(in_ByteSize(-1))
747 {
748 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
749 {
750 debug_only(NoSafepointVerifier nsv;)
751 assert_locked_or_safepoint(CodeCache_lock);
752
753 _deopt_handler_begin = (address) this;
754 _deopt_mh_handler_begin = (address) this;
755
756 init_defaults();
757 _entry_bci = entry_bci;
758 _compile_id = compile_id;
759 _comp_level = comp_level;
760 _orig_pc_offset = orig_pc_offset;
761 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
762
763 // Section offsets
764 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts());
765 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs());
766 set_ctable_begin(header_begin() + _consts_offset);
767
768 #if INCLUDE_JVMCI
769 if (compiler->is_jvmci()) {
770 // JVMCI might not produce any stub sections
771 if (offsets->value(CodeOffsets::Exceptions) != -1) {
772 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions);
773 } else {
774 _exception_offset = -1;
775 }
776 if (offsets->value(CodeOffsets::Deopt) != -1) {
777 _deopt_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::Deopt);
778 } else {
779 _deopt_handler_begin = NULL;
780 }
781 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
782 _deopt_mh_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::DeoptMH);
783 } else {
784 _deopt_mh_handler_begin = NULL;
785 }
786 } else
787 #endif
788 {
789 // Exception handler and deopt handler are in the stub section
790 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set");
791 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set");
792
793 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
794 _deopt_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::Deopt);
795 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
796 _deopt_mh_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::DeoptMH);
797 } else {
798 _deopt_mh_handler_begin = NULL;
799 }
800 }
801 if (offsets->value(CodeOffsets::UnwindHandler) != -1) {
802 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler);
803 } else {
804 _unwind_handler_offset = -1;
805 }
806
807 _oops_offset = data_offset();
808 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize);
809 int scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize);
810
811 _scopes_pcs_offset = scopes_data_offset + align_up(debug_info->data_size (), oopSize);
812 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
813 _native_invokers_offset = _dependencies_offset + align_up((int)dependencies->size_in_bytes(), oopSize);
814 _handler_table_offset = _native_invokers_offset + align_up(checked_cast<int>(native_invokers.data_size_in_bytes()), oopSize);
815 _nul_chk_table_offset = _handler_table_offset + align_up(handler_table->size_in_bytes(), oopSize);
816 #if INCLUDE_JVMCI
817 _speculations_offset = _nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize);
818 _jvmci_data_offset = _speculations_offset + align_up(speculations_len, oopSize);
819 _nmethod_end_offset = _jvmci_data_offset + align_up(jvmci_data_size, oopSize);
820 #else
821 _nmethod_end_offset = _nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize);
822 #endif
823 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
824 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
825 _inline_entry_point = code_begin() + offsets->value(CodeOffsets::Inline_Entry);
826 _verified_inline_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Inline_Entry);
827 _verified_inline_ro_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Inline_Entry_RO);
828 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry);
829 _exception_cache = NULL;
830 _scopes_data_begin = (address) this + scopes_data_offset;
831
832 _pc_desc_container.reset_to(scopes_pcs_begin());
833
834 code_buffer->copy_code_and_locs_to(this);
835 // Copy contents of ScopeDescRecorder to nmethod
836 code_buffer->copy_values_to(this);
837 debug_info->copy_to(this);
838 dependencies->copy_to(this);
839 if (native_invokers.is_nonempty()) { // can not get address of zero-length array
840 // Copy native stubs
841 memcpy(native_invokers_begin(), native_invokers.adr_at(0), native_invokers.data_size_in_bytes());
842 }
843 clear_unloading_state();
844
845 Universe::heap()->register_nmethod(this);
846 debug_only(Universe::heap()->verify_nmethod(this));
847
848 CodeCache::commit(this);
849
850 // Copy contents of ExceptionHandlerTable to nmethod
851 handler_table->copy_to(this);
852 nul_chk_table->copy_to(this);
853
854 #if INCLUDE_JVMCI
855 // Copy speculations to nmethod
856 if (speculations_size() != 0) {
857 memcpy(speculations_begin(), speculations, speculations_len);
858 }
859 #endif
860
861 // we use the information of entry points to find out if a method is
862 // static or non static
863 assert(compiler->is_c2() || compiler->is_jvmci() ||
864 _method->is_static() == (entry_point() == _verified_entry_point),
865 " entry points must be same for static methods and vice versa");
866 }
867 }
868
869 // Print a short set of xml attributes to identify this nmethod. The
870 // output should be embedded in some other element.
871 void nmethod::log_identity(xmlStream* log) const {
872 log->print(" compile_id='%d'", compile_id());
873 const char* nm_kind = compile_kind();
874 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind);
875 log->print(" compiler='%s'", compiler_name());
876 if (TieredCompilation) {
877 log->print(" level='%d'", comp_level());
878 }
879 #if INCLUDE_JVMCI
880 if (jvmci_nmethod_data() != NULL) {
881 const char* jvmci_name = jvmci_nmethod_data()->name();
882 if (jvmci_name != NULL) {
883 log->print(" jvmci_mirror_name='");
884 log->text("%s", jvmci_name);
885 log->print("'");
886 }
887 }
888 #endif
889 }
890
891
892 #define LOG_OFFSET(log, name) \
893 if (p2i(name##_end()) - p2i(name##_begin())) \
894 log->print(" " XSTR(name) "_offset='" INTX_FORMAT "'" , \
895 p2i(name##_begin()) - p2i(this))
896
897
898 void nmethod::log_new_nmethod() const {
899 if (LogCompilation && xtty != NULL) {
900 ttyLocker ttyl;
901 xtty->begin_elem("nmethod");
902 log_identity(xtty);
903 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size());
904 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this));
905
906 LOG_OFFSET(xtty, relocation);
907 LOG_OFFSET(xtty, consts);
908 LOG_OFFSET(xtty, insts);
909 LOG_OFFSET(xtty, stub);
910 LOG_OFFSET(xtty, scopes_data);
911 LOG_OFFSET(xtty, scopes_pcs);
912 LOG_OFFSET(xtty, dependencies);
913 LOG_OFFSET(xtty, handler_table);
914 LOG_OFFSET(xtty, nul_chk_table);
915 LOG_OFFSET(xtty, oops);
916 LOG_OFFSET(xtty, metadata);
917
918 xtty->method(method());
919 xtty->stamp();
920 xtty->end_elem();
921 }
922 }
923
924 #undef LOG_OFFSET
925
926
927 // Print out more verbose output usually for a newly created nmethod.
928 void nmethod::print_on(outputStream* st, const char* msg) const {
929 if (st != NULL) {
930 ttyLocker ttyl;
931 if (WizardMode) {
932 CompileTask::print(st, this, msg, /*short_form:*/ true);
933 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this));
934 } else {
935 CompileTask::print(st, this, msg, /*short_form:*/ false);
936 }
937 }
938 }
939
940 void nmethod::maybe_print_nmethod(DirectiveSet* directive) {
941 bool printnmethods = directive->PrintAssemblyOption || directive->PrintNMethodsOption;
942 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
943 print_nmethod(printnmethods);
944 }
945 }
946
947 static nmethod* _nmethod_to_print = NULL;
948 static const CompiledEntrySignature* _nmethod_to_print_ces = NULL;
949
950 void nmethod::print_nmethod(bool printmethod) {
951 run_nmethod_entry_barrier(); // ensure all embedded OOPs are valid before printing
952
953 ResourceMark rm;
954 CompiledEntrySignature ces(method());
955 ces.compute_calling_conventions();
956 // ces.compute_calling_conventions() needs to grab the ProtectionDomainSet_lock, so we
957 // can't do that (inside nmethod::print_entry_parameters) while holding the ttyLocker.
958 // Hence we have do compute it here and pass via a global. Yuck.
959 ttyLocker ttyl; // keep the following output all in one block
960 assert(_nmethod_to_print == NULL && _nmethod_to_print_ces == NULL, "no nesting");
961 _nmethod_to_print = this;
962 _nmethod_to_print_ces = &ces;
963 if (xtty != NULL) {
964 xtty->begin_head("print_nmethod");
965 log_identity(xtty);
966 xtty->stamp();
967 xtty->end_head();
968 }
969 // Print the header part, then print the requested information.
970 // This is both handled in decode2().
971 if (printmethod) {
972 ResourceMark m;
973 if (is_compiled_by_c1()) {
974 tty->cr();
975 tty->print_cr("============================= C1-compiled nmethod ==============================");
976 }
977 if (is_compiled_by_jvmci()) {
978 tty->cr();
979 tty->print_cr("=========================== JVMCI-compiled nmethod =============================");
980 }
981 tty->print_cr("----------------------------------- Assembly -----------------------------------");
982 decode2(tty);
983 #if defined(SUPPORT_DATA_STRUCTS)
984 if (AbstractDisassembler::show_structs()) {
985 // Print the oops from the underlying CodeBlob as well.
986 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
987 print_oops(tty);
988 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
989 print_metadata(tty);
990 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
991 print_pcs();
992 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
993 if (oop_maps() != NULL) {
994 tty->print("oop maps:"); // oop_maps()->print_on(tty) outputs a cr() at the beginning
995 oop_maps()->print_on(tty);
996 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
997 }
998 }
999 #endif
1000 } else {
1001 print(); // print the header part only.
1002 }
1003
1004 #if defined(SUPPORT_DATA_STRUCTS)
1005 if (AbstractDisassembler::show_structs()) {
1006 methodHandle mh(Thread::current(), _method);
1007 if (printmethod || PrintDebugInfo || CompilerOracle::has_option(mh, CompileCommand::PrintDebugInfo)) {
1008 print_scopes();
1009 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1010 }
1011 if (printmethod || PrintRelocations || CompilerOracle::has_option(mh, CompileCommand::PrintRelocations)) {
1012 print_relocations();
1013 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1014 }
1015 if (printmethod || PrintDependencies || CompilerOracle::has_option(mh, CompileCommand::PrintDependencies)) {
1016 print_dependencies();
1017 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1018 }
1019 if (printmethod && native_invokers_begin() < native_invokers_end()) {
1020 print_native_invokers();
1021 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1022 }
1023 if (printmethod || PrintExceptionHandlers) {
1024 print_handler_table();
1025 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1026 print_nul_chk_table();
1027 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1028 }
1029
1030 if (printmethod) {
1031 print_recorded_oops();
1032 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1033 print_recorded_metadata();
1034 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1035 }
1036 }
1037 #endif
1038
1039 if (xtty != NULL) {
1040 xtty->tail("print_nmethod");
1041 }
1042
1043 _nmethod_to_print = NULL;
1044 _nmethod_to_print_ces = NULL;
1045 }
1046
1047
1048 // Promote one word from an assembly-time handle to a live embedded oop.
1049 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
1050 if (handle == NULL ||
1051 // As a special case, IC oops are initialized to 1 or -1.
1052 handle == (jobject) Universe::non_oop_word()) {
1053 *(void**)dest = handle;
1054 } else {
1055 *dest = JNIHandles::resolve_non_null(handle);
1056 }
1057 }
1058
1059
1060 // Have to have the same name because it's called by a template
1061 void nmethod::copy_values(GrowableArray<jobject>* array) {
1062 int length = array->length();
1063 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
1064 oop* dest = oops_begin();
1065 for (int index = 0 ; index < length; index++) {
1066 initialize_immediate_oop(&dest[index], array->at(index));
1067 }
1068
1069 // Now we can fix up all the oops in the code. We need to do this
1070 // in the code because the assembler uses jobjects as placeholders.
1071 // The code and relocations have already been initialized by the
1072 // CodeBlob constructor, so it is valid even at this early point to
1073 // iterate over relocations and patch the code.
1074 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true);
1075 }
1076
1077 void nmethod::copy_values(GrowableArray<Metadata*>* array) {
1078 int length = array->length();
1079 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough");
1080 Metadata** dest = metadata_begin();
1081 for (int index = 0 ; index < length; index++) {
1082 dest[index] = array->at(index);
1083 }
1084 }
1085
1086 void nmethod::free_native_invokers() {
1087 for (RuntimeStub** it = native_invokers_begin(); it < native_invokers_end(); it++) {
1088 CodeCache::free(*it);
1089 }
1090 }
1091
1092 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) {
1093 // re-patch all oop-bearing instructions, just in case some oops moved
1094 RelocIterator iter(this, begin, end);
1095 while (iter.next()) {
1096 if (iter.type() == relocInfo::oop_type) {
1097 oop_Relocation* reloc = iter.oop_reloc();
1098 if (initialize_immediates && reloc->oop_is_immediate()) {
1099 oop* dest = reloc->oop_addr();
1100 initialize_immediate_oop(dest, cast_from_oop<jobject>(*dest));
1101 }
1102 // Refresh the oop-related bits of this instruction.
1103 reloc->fix_oop_relocation();
1104 } else if (iter.type() == relocInfo::metadata_type) {
1105 metadata_Relocation* reloc = iter.metadata_reloc();
1106 reloc->fix_metadata_relocation();
1107 }
1108 }
1109 }
1110
1111
1112 void nmethod::verify_clean_inline_caches() {
1113 assert(CompiledICLocker::is_safe(this), "mt unsafe call");
1114
1115 ResourceMark rm;
1116 RelocIterator iter(this, oops_reloc_begin());
1117 while(iter.next()) {
1118 switch(iter.type()) {
1119 case relocInfo::virtual_call_type:
1120 case relocInfo::opt_virtual_call_type: {
1121 CompiledIC *ic = CompiledIC_at(&iter);
1122 // Ok, to lookup references to zombies here
1123 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
1124 assert(cb != NULL, "destination not in CodeBlob?");
1125 nmethod* nm = cb->as_nmethod_or_null();
1126 if( nm != NULL ) {
1127 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
1128 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1129 assert(ic->is_clean(), "IC should be clean");
1130 }
1131 }
1132 break;
1133 }
1134 case relocInfo::static_call_type: {
1135 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
1136 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
1137 assert(cb != NULL, "destination not in CodeBlob?");
1138 nmethod* nm = cb->as_nmethod_or_null();
1139 if( nm != NULL ) {
1140 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
1141 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1142 assert(csc->is_clean(), "IC should be clean");
1143 }
1144 }
1145 break;
1146 }
1147 default:
1148 break;
1149 }
1150 }
1151 }
1152
1153 // This is a private interface with the sweeper.
1154 void nmethod::mark_as_seen_on_stack() {
1155 assert(is_alive(), "Must be an alive method");
1156 // Set the traversal mark to ensure that the sweeper does 2
1157 // cleaning passes before moving to zombie.
1158 set_stack_traversal_mark(NMethodSweeper::traversal_count());
1159 }
1160
1161 // Tell if a non-entrant method can be converted to a zombie (i.e.,
1162 // there are no activations on the stack, not in use by the VM,
1163 // and not in use by the ServiceThread)
1164 bool nmethod::can_convert_to_zombie() {
1165 // Note that this is called when the sweeper has observed the nmethod to be
1166 // not_entrant. However, with concurrent code cache unloading, the state
1167 // might have moved on to unloaded if it is_unloading(), due to racing
1168 // concurrent GC threads.
1169 assert(is_not_entrant() || is_unloading() ||
1170 !Thread::current()->is_Code_cache_sweeper_thread(),
1171 "must be a non-entrant method if called from sweeper");
1172
1173 // Since the nmethod sweeper only does partial sweep the sweeper's traversal
1174 // count can be greater than the stack traversal count before it hits the
1175 // nmethod for the second time.
1176 // If an is_unloading() nmethod is still not_entrant, then it is not safe to
1177 // convert it to zombie due to GC unloading interactions. However, if it
1178 // has become unloaded, then it is okay to convert such nmethods to zombie.
1179 return stack_traversal_mark() + 1 < NMethodSweeper::traversal_count() &&
1180 !is_locked_by_vm() && (!is_unloading() || is_unloaded());
1181 }
1182
1183 void nmethod::inc_decompile_count() {
1184 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return;
1185 // Could be gated by ProfileTraps, but do not bother...
1186 Method* m = method();
1187 if (m == NULL) return;
1188 MethodData* mdo = m->method_data();
1189 if (mdo == NULL) return;
1190 // There is a benign race here. See comments in methodData.hpp.
1191 mdo->inc_decompile_count();
1192 }
1193
1194 bool nmethod::try_transition(int new_state_int) {
1195 signed char new_state = new_state_int;
1196 #ifdef ASSERT
1197 if (new_state != unloaded) {
1198 assert_lock_strong(CompiledMethod_lock);
1199 }
1200 #endif
1201 for (;;) {
1202 signed char old_state = Atomic::load(&_state);
1203 if (old_state >= new_state) {
1204 // Ensure monotonicity of transitions.
1205 return false;
1206 }
1207 if (Atomic::cmpxchg(&_state, old_state, new_state) == old_state) {
1208 return true;
1209 }
1210 }
1211 }
1212
1213 void nmethod::make_unloaded() {
1214 post_compiled_method_unload();
1215
1216 // This nmethod is being unloaded, make sure that dependencies
1217 // recorded in instanceKlasses get flushed.
1218 // Since this work is being done during a GC, defer deleting dependencies from the
1219 // InstanceKlass.
1220 assert(Universe::heap()->is_gc_active() ||
1221 Thread::current()->is_ConcurrentGC_thread() ||
1222 Thread::current()->is_Worker_thread(),
1223 "should only be called during gc");
1224 flush_dependencies(/*delete_immediately*/false);
1225
1226 // Break cycle between nmethod & method
1227 LogTarget(Trace, class, unload, nmethod) lt;
1228 if (lt.is_enabled()) {
1229 LogStream ls(lt);
1230 ls.print("making nmethod " INTPTR_FORMAT
1231 " unloadable, Method*(" INTPTR_FORMAT
1232 ") ",
1233 p2i(this), p2i(_method));
1234 ls.cr();
1235 }
1236 // Unlink the osr method, so we do not look this up again
1237 if (is_osr_method()) {
1238 // Invalidate the osr nmethod only once. Note that with concurrent
1239 // code cache unloading, OSR nmethods are invalidated before they
1240 // are made unloaded. Therefore, this becomes a no-op then.
1241 if (is_in_use()) {
1242 invalidate_osr_method();
1243 }
1244 #ifdef ASSERT
1245 if (method() != NULL) {
1246 // Make sure osr nmethod is invalidated, i.e. not on the list
1247 bool found = method()->method_holder()->remove_osr_nmethod(this);
1248 assert(!found, "osr nmethod should have been invalidated");
1249 }
1250 #endif
1251 }
1252
1253 // If _method is already NULL the Method* is about to be unloaded,
1254 // so we don't have to break the cycle. Note that it is possible to
1255 // have the Method* live here, in case we unload the nmethod because
1256 // it is pointing to some oop (other than the Method*) being unloaded.
1257 if (_method != NULL) {
1258 _method->unlink_code(this);
1259 }
1260
1261 // Make the class unloaded - i.e., change state and notify sweeper
1262 assert(SafepointSynchronize::is_at_safepoint() ||
1263 Thread::current()->is_ConcurrentGC_thread() ||
1264 Thread::current()->is_Worker_thread(),
1265 "must be at safepoint");
1266
1267 {
1268 // Clear ICStubs and release any CompiledICHolders.
1269 CompiledICLocker ml(this);
1270 clear_ic_callsites();
1271 }
1272
1273 // Unregister must be done before the state change
1274 {
1275 MutexLocker ml(SafepointSynchronize::is_at_safepoint() ? NULL : CodeCache_lock,
1276 Mutex::_no_safepoint_check_flag);
1277 Universe::heap()->unregister_nmethod(this);
1278 }
1279
1280 // Clear the method of this dead nmethod
1281 set_method(NULL);
1282
1283 // Log the unloading.
1284 log_state_change();
1285
1286 // The Method* is gone at this point
1287 assert(_method == NULL, "Tautology");
1288
1289 set_osr_link(NULL);
1290 NMethodSweeper::report_state_change(this);
1291
1292 bool transition_success = try_transition(unloaded);
1293
1294 // It is an important invariant that there exists no race between
1295 // the sweeper and GC thread competing for making the same nmethod
1296 // zombie and unloaded respectively. This is ensured by
1297 // can_convert_to_zombie() returning false for any is_unloading()
1298 // nmethod, informing the sweeper not to step on any GC toes.
1299 assert(transition_success, "Invalid nmethod transition to unloaded");
1300
1301 #if INCLUDE_JVMCI
1302 // Clear the link between this nmethod and a HotSpotNmethod mirror
1303 JVMCINMethodData* nmethod_data = jvmci_nmethod_data();
1304 if (nmethod_data != NULL) {
1305 nmethod_data->invalidate_nmethod_mirror(this);
1306 }
1307 #endif
1308 }
1309
1310 void nmethod::invalidate_osr_method() {
1311 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
1312 // Remove from list of active nmethods
1313 if (method() != NULL) {
1314 method()->method_holder()->remove_osr_nmethod(this);
1315 }
1316 }
1317
1318 void nmethod::log_state_change() const {
1319 if (LogCompilation) {
1320 if (xtty != NULL) {
1321 ttyLocker ttyl; // keep the following output all in one block
1322 if (_state == unloaded) {
1323 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'",
1324 os::current_thread_id());
1325 } else {
1326 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s",
1327 os::current_thread_id(),
1328 (_state == zombie ? " zombie='1'" : ""));
1329 }
1330 log_identity(xtty);
1331 xtty->stamp();
1332 xtty->end_elem();
1333 }
1334 }
1335
1336 const char *state_msg = _state == zombie ? "made zombie" : "made not entrant";
1337 CompileTask::print_ul(this, state_msg);
1338 if (PrintCompilation && _state != unloaded) {
1339 print_on(tty, state_msg);
1340 }
1341 }
1342
1343 void nmethod::unlink_from_method() {
1344 if (method() != NULL) {
1345 method()->unlink_code(this);
1346 }
1347 }
1348
1349 /**
1350 * Common functionality for both make_not_entrant and make_zombie
1351 */
1352 bool nmethod::make_not_entrant_or_zombie(int state) {
1353 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant");
1354
1355 if (Atomic::load(&_state) >= state) {
1356 // Avoid taking the lock if already in required state.
1357 // This is safe from races because the state is an end-state,
1358 // which the nmethod cannot back out of once entered.
1359 // No need for fencing either.
1360 return false;
1361 }
1362
1363 // Make sure the nmethod is not flushed.
1364 nmethodLocker nml(this);
1365 // This can be called while the system is already at a safepoint which is ok
1366 NoSafepointVerifier nsv;
1367
1368 // during patching, depending on the nmethod state we must notify the GC that
1369 // code has been unloaded, unregistering it. We cannot do this right while
1370 // holding the CompiledMethod_lock because we need to use the CodeCache_lock. This
1371 // would be prone to deadlocks.
1372 // This flag is used to remember whether we need to later lock and unregister.
1373 bool nmethod_needs_unregister = false;
1374
1375 {
1376 // Enter critical section. Does not block for safepoint.
1377 MutexLocker ml(CompiledMethod_lock->owned_by_self() ? NULL : CompiledMethod_lock, Mutex::_no_safepoint_check_flag);
1378
1379 // This logic is equivalent to the logic below for patching the
1380 // verified entry point of regular methods. We check that the
1381 // nmethod is in use to ensure that it is invalidated only once.
1382 if (is_osr_method() && is_in_use()) {
1383 // this effectively makes the osr nmethod not entrant
1384 invalidate_osr_method();
1385 }
1386
1387 if (Atomic::load(&_state) >= state) {
1388 // another thread already performed this transition so nothing
1389 // to do, but return false to indicate this.
1390 return false;
1391 }
1392
1393 // The caller can be calling the method statically or through an inline
1394 // cache call.
1395 if (!is_osr_method() && !is_not_entrant()) {
1396 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
1397 SharedRuntime::get_handle_wrong_method_stub());
1398 }
1399
1400 if (is_in_use() && update_recompile_counts()) {
1401 // It's a true state change, so mark the method as decompiled.
1402 // Do it only for transition from alive.
1403 inc_decompile_count();
1404 }
1405
1406 // If the state is becoming a zombie, signal to unregister the nmethod with
1407 // the heap.
1408 // This nmethod may have already been unloaded during a full GC.
1409 if ((state == zombie) && !is_unloaded()) {
1410 nmethod_needs_unregister = true;
1411 }
1412
1413 // Must happen before state change. Otherwise we have a race condition in
1414 // nmethod::can_convert_to_zombie(). I.e., a method can immediately
1415 // transition its state from 'not_entrant' to 'zombie' without having to wait
1416 // for stack scanning.
1417 if (state == not_entrant) {
1418 mark_as_seen_on_stack();
1419 OrderAccess::storestore(); // _stack_traversal_mark and _state
1420 }
1421
1422 // Change state
1423 if (!try_transition(state)) {
1424 // If the transition fails, it is due to another thread making the nmethod more
1425 // dead. In particular, one thread might be making the nmethod unloaded concurrently.
1426 // If so, having patched in the jump in the verified entry unnecessarily is fine.
1427 // The nmethod is no longer possible to call by Java threads.
1428 // Incrementing the decompile count is also fine as the caller of make_not_entrant()
1429 // had a valid reason to deoptimize the nmethod.
1430 // Marking the nmethod as seen on stack also has no effect, as the nmethod is now
1431 // !is_alive(), and the seen on stack value is only used to convert not_entrant
1432 // nmethods to zombie in can_convert_to_zombie().
1433 return false;
1434 }
1435
1436 // Log the transition once
1437 log_state_change();
1438
1439 // Remove nmethod from method.
1440 unlink_from_method();
1441
1442 } // leave critical region under CompiledMethod_lock
1443
1444 #if INCLUDE_JVMCI
1445 // Invalidate can't occur while holding the Patching lock
1446 JVMCINMethodData* nmethod_data = jvmci_nmethod_data();
1447 if (nmethod_data != NULL) {
1448 nmethod_data->invalidate_nmethod_mirror(this);
1449 }
1450 #endif
1451
1452 #ifdef ASSERT
1453 if (is_osr_method() && method() != NULL) {
1454 // Make sure osr nmethod is invalidated, i.e. not on the list
1455 bool found = method()->method_holder()->remove_osr_nmethod(this);
1456 assert(!found, "osr nmethod should have been invalidated");
1457 }
1458 #endif
1459
1460 // When the nmethod becomes zombie it is no longer alive so the
1461 // dependencies must be flushed. nmethods in the not_entrant
1462 // state will be flushed later when the transition to zombie
1463 // happens or they get unloaded.
1464 if (state == zombie) {
1465 {
1466 // Flushing dependencies must be done before any possible
1467 // safepoint can sneak in, otherwise the oops used by the
1468 // dependency logic could have become stale.
1469 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1470 if (nmethod_needs_unregister) {
1471 Universe::heap()->unregister_nmethod(this);
1472 }
1473 flush_dependencies(/*delete_immediately*/true);
1474 }
1475
1476 #if INCLUDE_JVMCI
1477 // Now that the nmethod has been unregistered, it's
1478 // safe to clear the HotSpotNmethod mirror oop.
1479 if (nmethod_data != NULL) {
1480 nmethod_data->clear_nmethod_mirror(this);
1481 }
1482 #endif
1483
1484 // Clear ICStubs to prevent back patching stubs of zombie or flushed
1485 // nmethods during the next safepoint (see ICStub::finalize), as well
1486 // as to free up CompiledICHolder resources.
1487 {
1488 CompiledICLocker ml(this);
1489 clear_ic_callsites();
1490 }
1491
1492 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload
1493 // event and it hasn't already been reported for this nmethod then
1494 // report it now. The event may have been reported earlier if the GC
1495 // marked it for unloading). JvmtiDeferredEventQueue support means
1496 // we no longer go to a safepoint here.
1497 post_compiled_method_unload();
1498
1499 #ifdef ASSERT
1500 // It's no longer safe to access the oops section since zombie
1501 // nmethods aren't scanned for GC.
1502 _oops_are_stale = true;
1503 #endif
1504 // the Method may be reclaimed by class unloading now that the
1505 // nmethod is in zombie state
1506 set_method(NULL);
1507 } else {
1508 assert(state == not_entrant, "other cases may need to be handled differently");
1509 }
1510
1511 if (TraceCreateZombies && state == zombie) {
1512 ResourceMark m;
1513 tty->print_cr("nmethod <" INTPTR_FORMAT "> %s code made %s", p2i(this), this->method() ? this->method()->name_and_sig_as_C_string() : "null", (state == not_entrant) ? "not entrant" : "zombie");
1514 }
1515
1516 NMethodSweeper::report_state_change(this);
1517 return true;
1518 }
1519
1520 void nmethod::flush() {
1521 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1522 // Note that there are no valid oops in the nmethod anymore.
1523 assert(!is_osr_method() || is_unloaded() || is_zombie(),
1524 "osr nmethod must be unloaded or zombie before flushing");
1525 assert(is_zombie() || is_osr_method(), "must be a zombie method");
1526 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed");
1527 assert_locked_or_safepoint(CodeCache_lock);
1528
1529 // completely deallocate this method
1530 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, p2i(this));
1531 if (PrintMethodFlushing) {
1532 tty->print_cr("*flushing %s nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT
1533 "/Free CodeCache:" SIZE_FORMAT "Kb",
1534 is_osr_method() ? "osr" : "",_compile_id, p2i(this), CodeCache::blob_count(),
1535 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024);
1536 }
1537
1538 // We need to deallocate any ExceptionCache data.
1539 // Note that we do not need to grab the nmethod lock for this, it
1540 // better be thread safe if we're disposing of it!
1541 ExceptionCache* ec = exception_cache();
1542 set_exception_cache(NULL);
1543 while(ec != NULL) {
1544 ExceptionCache* next = ec->next();
1545 delete ec;
1546 ec = next;
1547 }
1548
1549 Universe::heap()->flush_nmethod(this);
1550 CodeCache::unregister_old_nmethod(this);
1551
1552 CodeBlob::flush();
1553 CodeCache::free(this);
1554 }
1555
1556 oop nmethod::oop_at(int index) const {
1557 if (index == 0) {
1558 return NULL;
1559 }
1560 return NativeAccess<AS_NO_KEEPALIVE>::oop_load(oop_addr_at(index));
1561 }
1562
1563 oop nmethod::oop_at_phantom(int index) const {
1564 if (index == 0) {
1565 return NULL;
1566 }
1567 return NativeAccess<ON_PHANTOM_OOP_REF>::oop_load(oop_addr_at(index));
1568 }
1569
1570 //
1571 // Notify all classes this nmethod is dependent on that it is no
1572 // longer dependent. This should only be called in two situations.
1573 // First, when a nmethod transitions to a zombie all dependents need
1574 // to be clear. Since zombification happens at a safepoint there's no
1575 // synchronization issues. The second place is a little more tricky.
1576 // During phase 1 of mark sweep class unloading may happen and as a
1577 // result some nmethods may get unloaded. In this case the flushing
1578 // of dependencies must happen during phase 1 since after GC any
1579 // dependencies in the unloaded nmethod won't be updated, so
1580 // traversing the dependency information in unsafe. In that case this
1581 // function is called with a boolean argument and this function only
1582 // notifies instanceKlasses that are reachable
1583
1584 void nmethod::flush_dependencies(bool delete_immediately) {
1585 DEBUG_ONLY(bool called_by_gc = Universe::heap()->is_gc_active() ||
1586 Thread::current()->is_ConcurrentGC_thread() ||
1587 Thread::current()->is_Worker_thread();)
1588 assert(called_by_gc != delete_immediately,
1589 "delete_immediately is false if and only if we are called during GC");
1590 if (!has_flushed_dependencies()) {
1591 set_has_flushed_dependencies();
1592 for (Dependencies::DepStream deps(this); deps.next(); ) {
1593 if (deps.type() == Dependencies::call_site_target_value) {
1594 // CallSite dependencies are managed on per-CallSite instance basis.
1595 oop call_site = deps.argument_oop(0);
1596 if (delete_immediately) {
1597 assert_locked_or_safepoint(CodeCache_lock);
1598 MethodHandles::remove_dependent_nmethod(call_site, this);
1599 } else {
1600 MethodHandles::clean_dependency_context(call_site);
1601 }
1602 } else {
1603 Klass* klass = deps.context_type();
1604 if (klass == NULL) {
1605 continue; // ignore things like evol_method
1606 }
1607 // During GC delete_immediately is false, and liveness
1608 // of dependee determines class that needs to be updated.
1609 if (delete_immediately) {
1610 assert_locked_or_safepoint(CodeCache_lock);
1611 InstanceKlass::cast(klass)->remove_dependent_nmethod(this);
1612 } else if (klass->is_loader_alive()) {
1613 // The GC may clean dependency contexts concurrently and in parallel.
1614 InstanceKlass::cast(klass)->clean_dependency_context();
1615 }
1616 }
1617 }
1618 }
1619 }
1620
1621 // ------------------------------------------------------------------
1622 // post_compiled_method_load_event
1623 // new method for install_code() path
1624 // Transfer information from compilation to jvmti
1625 void nmethod::post_compiled_method_load_event(JvmtiThreadState* state) {
1626
1627 // Don't post this nmethod load event if it is already dying
1628 // because the sweeper might already be deleting this nmethod.
1629 {
1630 MutexLocker ml(CompiledMethod_lock, Mutex::_no_safepoint_check_flag);
1631 // When the nmethod is acquired from the CodeCache iterator, it can racingly become zombie
1632 // before this code is called. Filter them out here under the CompiledMethod_lock.
1633 if (!is_alive()) {
1634 return;
1635 }
1636 // As for is_alive() nmethods, we also don't want them to racingly become zombie once we
1637 // release this lock, so we check that this is not going to be the case.
1638 if (is_not_entrant() && can_convert_to_zombie()) {
1639 return;
1640 }
1641 // Ensure the sweeper can't collect this nmethod until it become "active" with JvmtiThreadState::nmethods_do.
1642 mark_as_seen_on_stack();
1643 }
1644
1645 // This is a bad time for a safepoint. We don't want
1646 // this nmethod to get unloaded while we're queueing the event.
1647 NoSafepointVerifier nsv;
1648
1649 Method* m = method();
1650 HOTSPOT_COMPILED_METHOD_LOAD(
1651 (char *) m->klass_name()->bytes(),
1652 m->klass_name()->utf8_length(),
1653 (char *) m->name()->bytes(),
1654 m->name()->utf8_length(),
1655 (char *) m->signature()->bytes(),
1656 m->signature()->utf8_length(),
1657 insts_begin(), insts_size());
1658
1659
1660 if (JvmtiExport::should_post_compiled_method_load()) {
1661 // Only post unload events if load events are found.
1662 set_load_reported();
1663 // If a JavaThread hasn't been passed in, let the Service thread
1664 // (which is a real Java thread) post the event
1665 JvmtiDeferredEvent event = JvmtiDeferredEvent::compiled_method_load_event(this);
1666 if (state == NULL) {
1667 // Execute any barrier code for this nmethod as if it's called, since
1668 // keeping it alive looks like stack walking.
1669 run_nmethod_entry_barrier();
1670 ServiceThread::enqueue_deferred_event(&event);
1671 } else {
1672 // This enters the nmethod barrier outside in the caller.
1673 state->enqueue_event(&event);
1674 }
1675 }
1676 }
1677
1678 void nmethod::post_compiled_method_unload() {
1679 if (unload_reported()) {
1680 // During unloading we transition to unloaded and then to zombie
1681 // and the unloading is reported during the first transition.
1682 return;
1683 }
1684
1685 assert(_method != NULL && !is_unloaded(), "just checking");
1686 DTRACE_METHOD_UNLOAD_PROBE(method());
1687
1688 // If a JVMTI agent has enabled the CompiledMethodUnload event then
1689 // post the event. Sometime later this nmethod will be made a zombie
1690 // by the sweeper but the Method* will not be valid at that point.
1691 // The jmethodID is a weak reference to the Method* so if
1692 // it's being unloaded there's no way to look it up since the weak
1693 // ref will have been cleared.
1694
1695 // Don't bother posting the unload if the load event wasn't posted.
1696 if (load_reported() && JvmtiExport::should_post_compiled_method_unload()) {
1697 assert(!unload_reported(), "already unloaded");
1698 JvmtiDeferredEvent event =
1699 JvmtiDeferredEvent::compiled_method_unload_event(
1700 method()->jmethod_id(), insts_begin());
1701 ServiceThread::enqueue_deferred_event(&event);
1702 }
1703
1704 // The JVMTI CompiledMethodUnload event can be enabled or disabled at
1705 // any time. As the nmethod is being unloaded now we mark it has
1706 // having the unload event reported - this will ensure that we don't
1707 // attempt to report the event in the unlikely scenario where the
1708 // event is enabled at the time the nmethod is made a zombie.
1709 set_unload_reported();
1710 }
1711
1712 // Iterate over metadata calling this function. Used by RedefineClasses
1713 void nmethod::metadata_do(MetadataClosure* f) {
1714 {
1715 // Visit all immediate references that are embedded in the instruction stream.
1716 RelocIterator iter(this, oops_reloc_begin());
1717 while (iter.next()) {
1718 if (iter.type() == relocInfo::metadata_type) {
1719 metadata_Relocation* r = iter.metadata_reloc();
1720 // In this metadata, we must only follow those metadatas directly embedded in
1721 // the code. Other metadatas (oop_index>0) are seen as part of
1722 // the metadata section below.
1723 assert(1 == (r->metadata_is_immediate()) +
1724 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
1725 "metadata must be found in exactly one place");
1726 if (r->metadata_is_immediate() && r->metadata_value() != NULL) {
1727 Metadata* md = r->metadata_value();
1728 if (md != _method) f->do_metadata(md);
1729 }
1730 } else if (iter.type() == relocInfo::virtual_call_type) {
1731 // Check compiledIC holders associated with this nmethod
1732 ResourceMark rm;
1733 CompiledIC *ic = CompiledIC_at(&iter);
1734 if (ic->is_icholder_call()) {
1735 CompiledICHolder* cichk = ic->cached_icholder();
1736 f->do_metadata(cichk->holder_metadata());
1737 f->do_metadata(cichk->holder_klass());
1738 } else {
1739 Metadata* ic_oop = ic->cached_metadata();
1740 if (ic_oop != NULL) {
1741 f->do_metadata(ic_oop);
1742 }
1743 }
1744 }
1745 }
1746 }
1747
1748 // Visit the metadata section
1749 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
1750 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops
1751 Metadata* md = *p;
1752 f->do_metadata(md);
1753 }
1754
1755 // Visit metadata not embedded in the other places.
1756 if (_method != NULL) f->do_metadata(_method);
1757 }
1758
1759 // The _is_unloading_state encodes a tuple comprising the unloading cycle
1760 // and the result of IsUnloadingBehaviour::is_unloading() fpr that cycle.
1761 // This is the bit layout of the _is_unloading_state byte: 00000CCU
1762 // CC refers to the cycle, which has 2 bits, and U refers to the result of
1763 // IsUnloadingBehaviour::is_unloading() for that unloading cycle.
1764
1765 class IsUnloadingState: public AllStatic {
1766 static const uint8_t _is_unloading_mask = 1;
1767 static const uint8_t _is_unloading_shift = 0;
1768 static const uint8_t _unloading_cycle_mask = 6;
1769 static const uint8_t _unloading_cycle_shift = 1;
1770
1771 static uint8_t set_is_unloading(uint8_t state, bool value) {
1772 state &= ~_is_unloading_mask;
1773 if (value) {
1774 state |= 1 << _is_unloading_shift;
1775 }
1776 assert(is_unloading(state) == value, "unexpected unloading cycle overflow");
1777 return state;
1778 }
1779
1780 static uint8_t set_unloading_cycle(uint8_t state, uint8_t value) {
1781 state &= ~_unloading_cycle_mask;
1782 state |= value << _unloading_cycle_shift;
1783 assert(unloading_cycle(state) == value, "unexpected unloading cycle overflow");
1784 return state;
1785 }
1786
1787 public:
1788 static bool is_unloading(uint8_t state) { return (state & _is_unloading_mask) >> _is_unloading_shift == 1; }
1789 static uint8_t unloading_cycle(uint8_t state) { return (state & _unloading_cycle_mask) >> _unloading_cycle_shift; }
1790
1791 static uint8_t create(bool is_unloading, uint8_t unloading_cycle) {
1792 uint8_t state = 0;
1793 state = set_is_unloading(state, is_unloading);
1794 state = set_unloading_cycle(state, unloading_cycle);
1795 return state;
1796 }
1797 };
1798
1799 bool nmethod::is_unloading() {
1800 uint8_t state = RawAccess<MO_RELAXED>::load(&_is_unloading_state);
1801 bool state_is_unloading = IsUnloadingState::is_unloading(state);
1802 if (state_is_unloading) {
1803 return true;
1804 }
1805 uint8_t state_unloading_cycle = IsUnloadingState::unloading_cycle(state);
1806 uint8_t current_cycle = CodeCache::unloading_cycle();
1807 if (state_unloading_cycle == current_cycle) {
1808 return false;
1809 }
1810
1811 // The IsUnloadingBehaviour is responsible for checking if there are any dead
1812 // oops in the CompiledMethod, by calling oops_do on it.
1813 state_unloading_cycle = current_cycle;
1814
1815 if (is_zombie()) {
1816 // Zombies without calculated unloading epoch are never unloading due to GC.
1817
1818 // There are no races where a previously observed is_unloading() nmethod
1819 // suddenly becomes not is_unloading() due to here being observed as zombie.
1820
1821 // With STW unloading, all is_alive() && is_unloading() nmethods are unlinked
1822 // and unloaded in the safepoint. That makes races where an nmethod is first
1823 // observed as is_alive() && is_unloading() and subsequently observed as
1824 // is_zombie() impossible.
1825
1826 // With concurrent unloading, all references to is_unloading() nmethods are
1827 // first unlinked (e.g. IC caches and dependency contexts). Then a global
1828 // handshake operation is performed with all JavaThreads before finally
1829 // unloading the nmethods. The sweeper never converts is_alive() && is_unloading()
1830 // nmethods to zombies; it waits for them to become is_unloaded(). So before
1831 // the global handshake, it is impossible for is_unloading() nmethods to
1832 // racingly become is_zombie(). And is_unloading() is calculated for all is_alive()
1833 // nmethods before taking that global handshake, meaning that it will never
1834 // be recalculated after the handshake.
1835
1836 // After that global handshake, is_unloading() nmethods are only observable
1837 // to the iterators, and they will never trigger recomputation of the cached
1838 // is_unloading_state, and hence may not suffer from such races.
1839
1840 state_is_unloading = false;
1841 } else {
1842 state_is_unloading = IsUnloadingBehaviour::current()->is_unloading(this);
1843 }
1844
1845 state = IsUnloadingState::create(state_is_unloading, state_unloading_cycle);
1846
1847 RawAccess<MO_RELAXED>::store(&_is_unloading_state, state);
1848
1849 return state_is_unloading;
1850 }
1851
1852 void nmethod::clear_unloading_state() {
1853 uint8_t state = IsUnloadingState::create(false, CodeCache::unloading_cycle());
1854 RawAccess<MO_RELAXED>::store(&_is_unloading_state, state);
1855 }
1856
1857
1858 // This is called at the end of the strong tracing/marking phase of a
1859 // GC to unload an nmethod if it contains otherwise unreachable
1860 // oops.
1861
1862 void nmethod::do_unloading(bool unloading_occurred) {
1863 // Make sure the oop's ready to receive visitors
1864 assert(!is_zombie() && !is_unloaded(),
1865 "should not call follow on zombie or unloaded nmethod");
1866
1867 if (is_unloading()) {
1868 make_unloaded();
1869 } else {
1870 guarantee(unload_nmethod_caches(unloading_occurred),
1871 "Should not need transition stubs");
1872 }
1873 }
1874
1875 void nmethod::oops_do(OopClosure* f, bool allow_dead) {
1876 // make sure the oops ready to receive visitors
1877 assert(allow_dead || is_alive(), "should not call follow on dead nmethod");
1878
1879 // Prevent extra code cache walk for platforms that don't have immediate oops.
1880 if (relocInfo::mustIterateImmediateOopsInCode()) {
1881 RelocIterator iter(this, oops_reloc_begin());
1882
1883 while (iter.next()) {
1884 if (iter.type() == relocInfo::oop_type ) {
1885 oop_Relocation* r = iter.oop_reloc();
1886 // In this loop, we must only follow those oops directly embedded in
1887 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1888 assert(1 == (r->oop_is_immediate()) +
1889 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1890 "oop must be found in exactly one place");
1891 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1892 f->do_oop(r->oop_addr());
1893 }
1894 }
1895 }
1896 }
1897
1898 // Scopes
1899 // This includes oop constants not inlined in the code stream.
1900 for (oop* p = oops_begin(); p < oops_end(); p++) {
1901 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1902 f->do_oop(p);
1903 }
1904 }
1905
1906 nmethod* volatile nmethod::_oops_do_mark_nmethods;
1907
1908 void nmethod::oops_do_log_change(const char* state) {
1909 LogTarget(Trace, gc, nmethod) lt;
1910 if (lt.is_enabled()) {
1911 LogStream ls(lt);
1912 CompileTask::print(&ls, this, state, true /* short_form */);
1913 }
1914 }
1915
1916 bool nmethod::oops_do_try_claim() {
1917 if (oops_do_try_claim_weak_request()) {
1918 nmethod* result = oops_do_try_add_to_list_as_weak_done();
1919 assert(result == NULL, "adding to global list as weak done must always succeed.");
1920 return true;
1921 }
1922 return false;
1923 }
1924
1925 bool nmethod::oops_do_try_claim_weak_request() {
1926 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
1927
1928 if ((_oops_do_mark_link == NULL) &&
1929 (Atomic::replace_if_null(&_oops_do_mark_link, mark_link(this, claim_weak_request_tag)))) {
1930 oops_do_log_change("oops_do, mark weak request");
1931 return true;
1932 }
1933 return false;
1934 }
1935
1936 void nmethod::oops_do_set_strong_done(nmethod* old_head) {
1937 _oops_do_mark_link = mark_link(old_head, claim_strong_done_tag);
1938 }
1939
1940 nmethod::oops_do_mark_link* nmethod::oops_do_try_claim_strong_done() {
1941 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
1942
1943 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));
1944 if (old_next == NULL) {
1945 oops_do_log_change("oops_do, mark strong done");
1946 }
1947 return old_next;
1948 }
1949
1950 nmethod::oops_do_mark_link* nmethod::oops_do_try_add_strong_request(nmethod::oops_do_mark_link* next) {
1951 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
1952 assert(next == mark_link(this, claim_weak_request_tag), "Should be claimed as weak");
1953
1954 oops_do_mark_link* old_next = Atomic::cmpxchg(&_oops_do_mark_link, next, mark_link(this, claim_strong_request_tag));
1955 if (old_next == next) {
1956 oops_do_log_change("oops_do, mark strong request");
1957 }
1958 return old_next;
1959 }
1960
1961 bool nmethod::oops_do_try_claim_weak_done_as_strong_done(nmethod::oops_do_mark_link* next) {
1962 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
1963 assert(extract_state(next) == claim_weak_done_tag, "Should be claimed as weak done");
1964
1965 oops_do_mark_link* old_next = Atomic::cmpxchg(&_oops_do_mark_link, next, mark_link(extract_nmethod(next), claim_strong_done_tag));
1966 if (old_next == next) {
1967 oops_do_log_change("oops_do, mark weak done -> mark strong done");
1968 return true;
1969 }
1970 return false;
1971 }
1972
1973 nmethod* nmethod::oops_do_try_add_to_list_as_weak_done() {
1974 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
1975
1976 assert(extract_state(_oops_do_mark_link) == claim_weak_request_tag ||
1977 extract_state(_oops_do_mark_link) == claim_strong_request_tag,
1978 "must be but is nmethod " PTR_FORMAT " %u", p2i(extract_nmethod(_oops_do_mark_link)), extract_state(_oops_do_mark_link));
1979
1980 nmethod* old_head = Atomic::xchg(&_oops_do_mark_nmethods, this);
1981 // Self-loop if needed.
1982 if (old_head == NULL) {
1983 old_head = this;
1984 }
1985 // Try to install end of list and weak done tag.
1986 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)) {
1987 oops_do_log_change("oops_do, mark weak done");
1988 return NULL;
1989 } else {
1990 return old_head;
1991 }
1992 }
1993
1994 void nmethod::oops_do_add_to_list_as_strong_done() {
1995 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
1996
1997 nmethod* old_head = Atomic::xchg(&_oops_do_mark_nmethods, this);
1998 // Self-loop if needed.
1999 if (old_head == NULL) {
2000 old_head = this;
2001 }
2002 assert(_oops_do_mark_link == mark_link(this, claim_strong_done_tag), "must be but is nmethod " PTR_FORMAT " state %u",
2003 p2i(extract_nmethod(_oops_do_mark_link)), extract_state(_oops_do_mark_link));
2004
2005 oops_do_set_strong_done(old_head);
2006 }
2007
2008 void nmethod::oops_do_process_weak(OopsDoProcessor* p) {
2009 if (!oops_do_try_claim_weak_request()) {
2010 // Failed to claim for weak processing.
2011 oops_do_log_change("oops_do, mark weak request fail");
2012 return;
2013 }
2014
2015 p->do_regular_processing(this);
2016
2017 nmethod* old_head = oops_do_try_add_to_list_as_weak_done();
2018 if (old_head == NULL) {
2019 return;
2020 }
2021 oops_do_log_change("oops_do, mark weak done fail");
2022 // Adding to global list failed, another thread added a strong request.
2023 assert(extract_state(_oops_do_mark_link) == claim_strong_request_tag,
2024 "must be but is %u", extract_state(_oops_do_mark_link));
2025
2026 oops_do_log_change("oops_do, mark weak request -> mark strong done");
2027
2028 oops_do_set_strong_done(old_head);
2029 // Do missing strong processing.
2030 p->do_remaining_strong_processing(this);
2031 }
2032
2033 void nmethod::oops_do_process_strong(OopsDoProcessor* p) {
2034 oops_do_mark_link* next_raw = oops_do_try_claim_strong_done();
2035 if (next_raw == NULL) {
2036 p->do_regular_processing(this);
2037 oops_do_add_to_list_as_strong_done();
2038 return;
2039 }
2040 // Claim failed. Figure out why and handle it.
2041 if (oops_do_has_weak_request(next_raw)) {
2042 oops_do_mark_link* old = next_raw;
2043 // Claim failed because being weak processed (state == "weak request").
2044 // Try to request deferred strong processing.
2045 next_raw = oops_do_try_add_strong_request(old);
2046 if (next_raw == old) {
2047 // Successfully requested deferred strong processing.
2048 return;
2049 }
2050 // Failed because of a concurrent transition. No longer in "weak request" state.
2051 }
2052 if (oops_do_has_any_strong_state(next_raw)) {
2053 // Already claimed for strong processing or requested for such.
2054 return;
2055 }
2056 if (oops_do_try_claim_weak_done_as_strong_done(next_raw)) {
2057 // Successfully claimed "weak done" as "strong done". Do the missing marking.
2058 p->do_remaining_strong_processing(this);
2059 return;
2060 }
2061 // Claim failed, some other thread got it.
2062 }
2063
2064 void nmethod::oops_do_marking_prologue() {
2065 assert_at_safepoint();
2066
2067 log_trace(gc, nmethod)("oops_do_marking_prologue");
2068 assert(_oops_do_mark_nmethods == NULL, "must be empty");
2069 }
2070
2071 void nmethod::oops_do_marking_epilogue() {
2072 assert_at_safepoint();
2073
2074 nmethod* next = _oops_do_mark_nmethods;
2075 _oops_do_mark_nmethods = NULL;
2076 if (next != NULL) {
2077 nmethod* cur;
2078 do {
2079 cur = next;
2080 next = extract_nmethod(cur->_oops_do_mark_link);
2081 cur->_oops_do_mark_link = NULL;
2082 DEBUG_ONLY(cur->verify_oop_relocations());
2083
2084 LogTarget(Trace, gc, nmethod) lt;
2085 if (lt.is_enabled()) {
2086 LogStream ls(lt);
2087 CompileTask::print(&ls, cur, "oops_do, unmark", /*short_form:*/ true);
2088 }
2089 // End if self-loop has been detected.
2090 } while (cur != next);
2091 }
2092 log_trace(gc, nmethod)("oops_do_marking_epilogue");
2093 }
2094
2095 inline bool includes(void* p, void* from, void* to) {
2096 return from <= p && p < to;
2097 }
2098
2099
2100 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
2101 assert(count >= 2, "must be sentinel values, at least");
2102
2103 #ifdef ASSERT
2104 // must be sorted and unique; we do a binary search in find_pc_desc()
2105 int prev_offset = pcs[0].pc_offset();
2106 assert(prev_offset == PcDesc::lower_offset_limit,
2107 "must start with a sentinel");
2108 for (int i = 1; i < count; i++) {
2109 int this_offset = pcs[i].pc_offset();
2110 assert(this_offset > prev_offset, "offsets must be sorted");
2111 prev_offset = this_offset;
2112 }
2113 assert(prev_offset == PcDesc::upper_offset_limit,
2114 "must end with a sentinel");
2115 #endif //ASSERT
2116
2117 // Search for MethodHandle invokes and tag the nmethod.
2118 for (int i = 0; i < count; i++) {
2119 if (pcs[i].is_method_handle_invoke()) {
2120 set_has_method_handle_invokes(true);
2121 break;
2122 }
2123 }
2124 assert(has_method_handle_invokes() == (_deopt_mh_handler_begin != NULL), "must have deopt mh handler");
2125
2126 int size = count * sizeof(PcDesc);
2127 assert(scopes_pcs_size() >= size, "oob");
2128 memcpy(scopes_pcs_begin(), pcs, size);
2129
2130 // Adjust the final sentinel downward.
2131 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
2132 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
2133 last_pc->set_pc_offset(content_size() + 1);
2134 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
2135 // Fill any rounding gaps with copies of the last record.
2136 last_pc[1] = last_pc[0];
2137 }
2138 // The following assert could fail if sizeof(PcDesc) is not
2139 // an integral multiple of oopSize (the rounding term).
2140 // If it fails, change the logic to always allocate a multiple
2141 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
2142 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
2143 }
2144
2145 void nmethod::copy_scopes_data(u_char* buffer, int size) {
2146 assert(scopes_data_size() >= size, "oob");
2147 memcpy(scopes_data_begin(), buffer, size);
2148 }
2149
2150 #ifdef ASSERT
2151 static PcDesc* linear_search(const PcDescSearch& search, int pc_offset, bool approximate) {
2152 PcDesc* lower = search.scopes_pcs_begin();
2153 PcDesc* upper = search.scopes_pcs_end();
2154 lower += 1; // exclude initial sentinel
2155 PcDesc* res = NULL;
2156 for (PcDesc* p = lower; p < upper; p++) {
2157 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc
2158 if (match_desc(p, pc_offset, approximate)) {
2159 if (res == NULL)
2160 res = p;
2161 else
2162 res = (PcDesc*) badAddress;
2163 }
2164 }
2165 return res;
2166 }
2167 #endif
2168
2169
2170 // Finds a PcDesc with real-pc equal to "pc"
2171 PcDesc* PcDescContainer::find_pc_desc_internal(address pc, bool approximate, const PcDescSearch& search) {
2172 address base_address = search.code_begin();
2173 if ((pc < base_address) ||
2174 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
2175 return NULL; // PC is wildly out of range
2176 }
2177 int pc_offset = (int) (pc - base_address);
2178
2179 // Check the PcDesc cache if it contains the desired PcDesc
2180 // (This as an almost 100% hit rate.)
2181 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
2182 if (res != NULL) {
2183 assert(res == linear_search(search, pc_offset, approximate), "cache ok");
2184 return res;
2185 }
2186
2187 // Fallback algorithm: quasi-linear search for the PcDesc
2188 // Find the last pc_offset less than the given offset.
2189 // The successor must be the required match, if there is a match at all.
2190 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
2191 PcDesc* lower = search.scopes_pcs_begin();
2192 PcDesc* upper = search.scopes_pcs_end();
2193 upper -= 1; // exclude final sentinel
2194 if (lower >= upper) return NULL; // native method; no PcDescs at all
2195
2196 #define assert_LU_OK \
2197 /* invariant on lower..upper during the following search: */ \
2198 assert(lower->pc_offset() < pc_offset, "sanity"); \
2199 assert(upper->pc_offset() >= pc_offset, "sanity")
2200 assert_LU_OK;
2201
2202 // Use the last successful return as a split point.
2203 PcDesc* mid = _pc_desc_cache.last_pc_desc();
2204 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
2205 if (mid->pc_offset() < pc_offset) {
2206 lower = mid;
2207 } else {
2208 upper = mid;
2209 }
2210
2211 // Take giant steps at first (4096, then 256, then 16, then 1)
2212 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
2213 const int RADIX = (1 << LOG2_RADIX);
2214 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
2215 while ((mid = lower + step) < upper) {
2216 assert_LU_OK;
2217 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
2218 if (mid->pc_offset() < pc_offset) {
2219 lower = mid;
2220 } else {
2221 upper = mid;
2222 break;
2223 }
2224 }
2225 assert_LU_OK;
2226 }
2227
2228 // Sneak up on the value with a linear search of length ~16.
2229 while (true) {
2230 assert_LU_OK;
2231 mid = lower + 1;
2232 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
2233 if (mid->pc_offset() < pc_offset) {
2234 lower = mid;
2235 } else {
2236 upper = mid;
2237 break;
2238 }
2239 }
2240 #undef assert_LU_OK
2241
2242 if (match_desc(upper, pc_offset, approximate)) {
2243 assert(upper == linear_search(search, pc_offset, approximate), "search ok");
2244 _pc_desc_cache.add_pc_desc(upper);
2245 return upper;
2246 } else {
2247 assert(NULL == linear_search(search, pc_offset, approximate), "search ok");
2248 return NULL;
2249 }
2250 }
2251
2252
2253 void nmethod::check_all_dependencies(DepChange& changes) {
2254 // Checked dependencies are allocated into this ResourceMark
2255 ResourceMark rm;
2256
2257 // Turn off dependency tracing while actually testing dependencies.
2258 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) );
2259
2260 typedef ResourceHashtable<DependencySignature, int, 11027,
2261 ResourceObj::RESOURCE_AREA, mtInternal,
2262 &DependencySignature::hash,
2263 &DependencySignature::equals> DepTable;
2264
2265 DepTable* table = new DepTable();
2266
2267 // Iterate over live nmethods and check dependencies of all nmethods that are not
2268 // marked for deoptimization. A particular dependency is only checked once.
2269 NMethodIterator iter(NMethodIterator::only_alive_and_not_unloading);
2270 while(iter.next()) {
2271 nmethod* nm = iter.method();
2272 // Only notify for live nmethods
2273 if (!nm->is_marked_for_deoptimization()) {
2274 for (Dependencies::DepStream deps(nm); deps.next(); ) {
2275 // Construct abstraction of a dependency.
2276 DependencySignature* current_sig = new DependencySignature(deps);
2277
2278 // Determine if dependency is already checked. table->put(...) returns
2279 // 'true' if the dependency is added (i.e., was not in the hashtable).
2280 if (table->put(*current_sig, 1)) {
2281 if (deps.check_dependency() != NULL) {
2282 // Dependency checking failed. Print out information about the failed
2283 // dependency and finally fail with an assert. We can fail here, since
2284 // dependency checking is never done in a product build.
2285 tty->print_cr("Failed dependency:");
2286 changes.print();
2287 nm->print();
2288 nm->print_dependencies();
2289 assert(false, "Should have been marked for deoptimization");
2290 }
2291 }
2292 }
2293 }
2294 }
2295 }
2296
2297 bool nmethod::check_dependency_on(DepChange& changes) {
2298 // What has happened:
2299 // 1) a new class dependee has been added
2300 // 2) dependee and all its super classes have been marked
2301 bool found_check = false; // set true if we are upset
2302 for (Dependencies::DepStream deps(this); deps.next(); ) {
2303 // Evaluate only relevant dependencies.
2304 if (deps.spot_check_dependency_at(changes) != NULL) {
2305 found_check = true;
2306 NOT_DEBUG(break);
2307 }
2308 }
2309 return found_check;
2310 }
2311
2312 // Called from mark_for_deoptimization, when dependee is invalidated.
2313 bool nmethod::is_dependent_on_method(Method* dependee) {
2314 for (Dependencies::DepStream deps(this); deps.next(); ) {
2315 if (deps.type() != Dependencies::evol_method)
2316 continue;
2317 Method* method = deps.method_argument(0);
2318 if (method == dependee) return true;
2319 }
2320 return false;
2321 }
2322
2323
2324 bool nmethod::is_patchable_at(address instr_addr) {
2325 assert(insts_contains(instr_addr), "wrong nmethod used");
2326 if (is_zombie()) {
2327 // a zombie may never be patched
2328 return false;
2329 }
2330 return true;
2331 }
2332
2333
2334 void nmethod_init() {
2335 // make sure you didn't forget to adjust the filler fields
2336 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
2337 }
2338
2339
2340 //-------------------------------------------------------------------------------------------
2341
2342
2343 // QQQ might we make this work from a frame??
2344 nmethodLocker::nmethodLocker(address pc) {
2345 CodeBlob* cb = CodeCache::find_blob(pc);
2346 guarantee(cb != NULL && cb->is_compiled(), "bad pc for a nmethod found");
2347 _nm = cb->as_compiled_method();
2348 lock_nmethod(_nm);
2349 }
2350
2351 // Only JvmtiDeferredEvent::compiled_method_unload_event()
2352 // should pass zombie_ok == true.
2353 void nmethodLocker::lock_nmethod(CompiledMethod* cm, bool zombie_ok) {
2354 if (cm == NULL) return;
2355 nmethod* nm = cm->as_nmethod();
2356 Atomic::inc(&nm->_lock_count);
2357 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method: %p", nm);
2358 }
2359
2360 void nmethodLocker::unlock_nmethod(CompiledMethod* cm) {
2361 if (cm == NULL) return;
2362 nmethod* nm = cm->as_nmethod();
2363 Atomic::dec(&nm->_lock_count);
2364 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock");
2365 }
2366
2367
2368 // -----------------------------------------------------------------------------
2369 // Verification
2370
2371 class VerifyOopsClosure: public OopClosure {
2372 nmethod* _nm;
2373 bool _ok;
2374 public:
2375 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
2376 bool ok() { return _ok; }
2377 virtual void do_oop(oop* p) {
2378 if (oopDesc::is_oop_or_null(*p)) return;
2379 // Print diagnostic information before calling print_nmethod().
2380 // Assertions therein might prevent call from returning.
2381 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2382 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2383 if (_ok) {
2384 _nm->print_nmethod(true);
2385 _ok = false;
2386 }
2387 }
2388 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2389 };
2390
2391 class VerifyMetadataClosure: public MetadataClosure {
2392 public:
2393 void do_metadata(Metadata* md) {
2394 if (md->is_method()) {
2395 Method* method = (Method*)md;
2396 assert(!method->is_old(), "Should not be installing old methods");
2397 }
2398 }
2399 };
2400
2401
2402 void nmethod::verify() {
2403
2404 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant
2405 // seems odd.
2406
2407 if (is_zombie() || is_not_entrant() || is_unloaded())
2408 return;
2409
2410 // Make sure all the entry points are correctly aligned for patching.
2411 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
2412
2413 // assert(oopDesc::is_oop(method()), "must be valid");
2414
2415 ResourceMark rm;
2416
2417 if (!CodeCache::contains(this)) {
2418 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this));
2419 }
2420
2421 if(is_native_method() )
2422 return;
2423
2424 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
2425 if (nm != this) {
2426 fatal("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this));
2427 }
2428
2429 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2430 if (! p->verify(this)) {
2431 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this));
2432 }
2433 }
2434
2435 #ifdef ASSERT
2436 #if INCLUDE_JVMCI
2437 {
2438 // Verify that implicit exceptions that deoptimize have a PcDesc and OopMap
2439 ImmutableOopMapSet* oms = oop_maps();
2440 ImplicitExceptionTable implicit_table(this);
2441 for (uint i = 0; i < implicit_table.len(); i++) {
2442 int exec_offset = (int) implicit_table.get_exec_offset(i);
2443 if (implicit_table.get_exec_offset(i) == implicit_table.get_cont_offset(i)) {
2444 assert(pc_desc_at(code_begin() + exec_offset) != NULL, "missing PcDesc");
2445 bool found = false;
2446 for (int i = 0, imax = oms->count(); i < imax; i++) {
2447 if (oms->pair_at(i)->pc_offset() == exec_offset) {
2448 found = true;
2449 break;
2450 }
2451 }
2452 assert(found, "missing oopmap");
2453 }
2454 }
2455 }
2456 #endif
2457 #endif
2458
2459 VerifyOopsClosure voc(this);
2460 oops_do(&voc);
2461 assert(voc.ok(), "embedded oops must be OK");
2462 Universe::heap()->verify_nmethod(this);
2463
2464 assert(_oops_do_mark_link == NULL, "_oops_do_mark_link for %s should be NULL but is " PTR_FORMAT,
2465 nm->method()->external_name(), p2i(_oops_do_mark_link));
2466 verify_scopes();
2467
2468 CompiledICLocker nm_verify(this);
2469 VerifyMetadataClosure vmc;
2470 metadata_do(&vmc);
2471 }
2472
2473
2474 void nmethod::verify_interrupt_point(address call_site) {
2475
2476 // Verify IC only when nmethod installation is finished.
2477 if (!is_not_installed()) {
2478 if (CompiledICLocker::is_safe(this)) {
2479 CompiledIC_at(this, call_site);
2480 } else {
2481 CompiledICLocker ml_verify(this);
2482 CompiledIC_at(this, call_site);
2483 }
2484 }
2485
2486 HandleMark hm(Thread::current());
2487
2488 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address());
2489 assert(pd != NULL, "PcDesc must exist");
2490 for (ScopeDesc* sd = new ScopeDesc(this, pd);
2491 !sd->is_top(); sd = sd->sender()) {
2492 sd->verify();
2493 }
2494 }
2495
2496 void nmethod::verify_scopes() {
2497 if( !method() ) return; // Runtime stubs have no scope
2498 if (method()->is_native()) return; // Ignore stub methods.
2499 // iterate through all interrupt point
2500 // and verify the debug information is valid.
2501 RelocIterator iter((nmethod*)this);
2502 while (iter.next()) {
2503 address stub = NULL;
2504 switch (iter.type()) {
2505 case relocInfo::virtual_call_type:
2506 verify_interrupt_point(iter.addr());
2507 break;
2508 case relocInfo::opt_virtual_call_type:
2509 stub = iter.opt_virtual_call_reloc()->static_stub();
2510 verify_interrupt_point(iter.addr());
2511 break;
2512 case relocInfo::static_call_type:
2513 stub = iter.static_call_reloc()->static_stub();
2514 //verify_interrupt_point(iter.addr());
2515 break;
2516 case relocInfo::runtime_call_type:
2517 case relocInfo::runtime_call_w_cp_type: {
2518 address destination = iter.reloc()->value();
2519 // Right now there is no way to find out which entries support
2520 // an interrupt point. It would be nice if we had this
2521 // information in a table.
2522 break;
2523 }
2524 default:
2525 break;
2526 }
2527 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section");
2528 }
2529 }
2530
2531
2532 // -----------------------------------------------------------------------------
2533 // Printing operations
2534
2535 void nmethod::print() const {
2536 ttyLocker ttyl; // keep the following output all in one block
2537 print(tty);
2538 }
2539
2540 void nmethod::print(outputStream* st) const {
2541 ResourceMark rm;
2542
2543 st->print("Compiled method ");
2544
2545 if (is_compiled_by_c1()) {
2546 st->print("(c1) ");
2547 } else if (is_compiled_by_c2()) {
2548 st->print("(c2) ");
2549 } else if (is_compiled_by_jvmci()) {
2550 st->print("(JVMCI) ");
2551 } else {
2552 st->print("(n/a) ");
2553 }
2554
2555 print_on(tty, NULL);
2556
2557 if (WizardMode) {
2558 st->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this));
2559 st->print(" for method " INTPTR_FORMAT , p2i(method()));
2560 st->print(" { ");
2561 st->print_cr("%s ", state());
2562 st->print_cr("}:");
2563 }
2564 if (size () > 0) st->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2565 p2i(this),
2566 p2i(this) + size(),
2567 size());
2568 if (relocation_size () > 0) st->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2569 p2i(relocation_begin()),
2570 p2i(relocation_end()),
2571 relocation_size());
2572 if (consts_size () > 0) st->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2573 p2i(consts_begin()),
2574 p2i(consts_end()),
2575 consts_size());
2576 if (insts_size () > 0) st->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2577 p2i(insts_begin()),
2578 p2i(insts_end()),
2579 insts_size());
2580 if (stub_size () > 0) st->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2581 p2i(stub_begin()),
2582 p2i(stub_end()),
2583 stub_size());
2584 if (oops_size () > 0) st->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2585 p2i(oops_begin()),
2586 p2i(oops_end()),
2587 oops_size());
2588 if (metadata_size () > 0) st->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2589 p2i(metadata_begin()),
2590 p2i(metadata_end()),
2591 metadata_size());
2592 if (scopes_data_size () > 0) st->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2593 p2i(scopes_data_begin()),
2594 p2i(scopes_data_end()),
2595 scopes_data_size());
2596 if (scopes_pcs_size () > 0) st->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2597 p2i(scopes_pcs_begin()),
2598 p2i(scopes_pcs_end()),
2599 scopes_pcs_size());
2600 if (dependencies_size () > 0) st->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2601 p2i(dependencies_begin()),
2602 p2i(dependencies_end()),
2603 dependencies_size());
2604 if (handler_table_size() > 0) st->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2605 p2i(handler_table_begin()),
2606 p2i(handler_table_end()),
2607 handler_table_size());
2608 if (nul_chk_table_size() > 0) st->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2609 p2i(nul_chk_table_begin()),
2610 p2i(nul_chk_table_end()),
2611 nul_chk_table_size());
2612 #if INCLUDE_JVMCI
2613 if (speculations_size () > 0) st->print_cr(" speculations [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2614 p2i(speculations_begin()),
2615 p2i(speculations_end()),
2616 speculations_size());
2617 if (jvmci_data_size () > 0) st->print_cr(" JVMCI data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2618 p2i(jvmci_data_begin()),
2619 p2i(jvmci_data_end()),
2620 jvmci_data_size());
2621 #endif
2622 }
2623
2624 void nmethod::print_code() {
2625 ResourceMark m;
2626 ttyLocker ttyl;
2627 // Call the specialized decode method of this class.
2628 decode(tty);
2629 }
2630
2631 #ifndef PRODUCT // called InstanceKlass methods are available only then. Declared as PRODUCT_RETURN
2632
2633 void nmethod::print_dependencies() {
2634 ResourceMark rm;
2635 ttyLocker ttyl; // keep the following output all in one block
2636 tty->print_cr("Dependencies:");
2637 for (Dependencies::DepStream deps(this); deps.next(); ) {
2638 deps.print_dependency();
2639 Klass* ctxk = deps.context_type();
2640 if (ctxk != NULL) {
2641 if (ctxk->is_instance_klass() && InstanceKlass::cast(ctxk)->is_dependent_nmethod(this)) {
2642 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name());
2643 }
2644 }
2645 deps.log_dependency(); // put it into the xml log also
2646 }
2647 }
2648 #endif
2649
2650 #if defined(SUPPORT_DATA_STRUCTS)
2651
2652 // Print the oops from the underlying CodeBlob.
2653 void nmethod::print_oops(outputStream* st) {
2654 ResourceMark m;
2655 st->print("Oops:");
2656 if (oops_begin() < oops_end()) {
2657 st->cr();
2658 for (oop* p = oops_begin(); p < oops_end(); p++) {
2659 Disassembler::print_location((unsigned char*)p, (unsigned char*)oops_begin(), (unsigned char*)oops_end(), st, true, false);
2660 st->print(PTR_FORMAT " ", *((uintptr_t*)p));
2661 if (Universe::contains_non_oop_word(p)) {
2662 st->print_cr("NON_OOP");
2663 continue; // skip non-oops
2664 }
2665 if (*p == NULL) {
2666 st->print_cr("NULL-oop");
2667 continue; // skip non-oops
2668 }
2669 (*p)->print_value_on(st);
2670 st->cr();
2671 }
2672 } else {
2673 st->print_cr(" <list empty>");
2674 }
2675 }
2676
2677 // Print metadata pool.
2678 void nmethod::print_metadata(outputStream* st) {
2679 ResourceMark m;
2680 st->print("Metadata:");
2681 if (metadata_begin() < metadata_end()) {
2682 st->cr();
2683 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
2684 Disassembler::print_location((unsigned char*)p, (unsigned char*)metadata_begin(), (unsigned char*)metadata_end(), st, true, false);
2685 st->print(PTR_FORMAT " ", *((uintptr_t*)p));
2686 if (*p && *p != Universe::non_oop_word()) {
2687 (*p)->print_value_on(st);
2688 }
2689 st->cr();
2690 }
2691 } else {
2692 st->print_cr(" <list empty>");
2693 }
2694 }
2695
2696 #ifndef PRODUCT // ScopeDesc::print_on() is available only then. Declared as PRODUCT_RETURN
2697 void nmethod::print_scopes_on(outputStream* st) {
2698 // Find the first pc desc for all scopes in the code and print it.
2699 ResourceMark rm;
2700 st->print("scopes:");
2701 if (scopes_pcs_begin() < scopes_pcs_end()) {
2702 st->cr();
2703 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2704 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
2705 continue;
2706
2707 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
2708 while (sd != NULL) {
2709 sd->print_on(st, p); // print output ends with a newline
2710 sd = sd->sender();
2711 }
2712 }
2713 } else {
2714 st->print_cr(" <list empty>");
2715 }
2716 }
2717 #endif
2718
2719 #ifndef PRODUCT // RelocIterator does support printing only then.
2720 void nmethod::print_relocations() {
2721 ResourceMark m; // in case methods get printed via the debugger
2722 tty->print_cr("relocations:");
2723 RelocIterator iter(this);
2724 iter.print();
2725 }
2726 #endif
2727
2728 void nmethod::print_pcs_on(outputStream* st) {
2729 ResourceMark m; // in case methods get printed via debugger
2730 st->print("pc-bytecode offsets:");
2731 if (scopes_pcs_begin() < scopes_pcs_end()) {
2732 st->cr();
2733 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2734 p->print_on(st, this); // print output ends with a newline
2735 }
2736 } else {
2737 st->print_cr(" <list empty>");
2738 }
2739 }
2740
2741 void nmethod::print_native_invokers() {
2742 ResourceMark m; // in case methods get printed via debugger
2743 tty->print_cr("Native invokers:");
2744 for (RuntimeStub** itt = native_invokers_begin(); itt < native_invokers_end(); itt++) {
2745 (*itt)->print_on(tty);
2746 }
2747 }
2748
2749 void nmethod::print_handler_table() {
2750 ExceptionHandlerTable(this).print(code_begin());
2751 }
2752
2753 void nmethod::print_nul_chk_table() {
2754 ImplicitExceptionTable(this).print(code_begin());
2755 }
2756
2757 void nmethod::print_recorded_oop(int log_n, int i) {
2758 void* value;
2759
2760 if (i == 0) {
2761 value = NULL;
2762 } else {
2763 // Be careful around non-oop words. Don't create an oop
2764 // with that value, or it will assert in verification code.
2765 if (Universe::contains_non_oop_word(oop_addr_at(i))) {
2766 value = Universe::non_oop_word();
2767 } else {
2768 value = oop_at(i);
2769 }
2770 }
2771
2772 tty->print("#%*d: " INTPTR_FORMAT " ", log_n, i, p2i(value));
2773
2774 if (value == Universe::non_oop_word()) {
2775 tty->print("non-oop word");
2776 } else {
2777 if (value == 0) {
2778 tty->print("NULL-oop");
2779 } else {
2780 oop_at(i)->print_value_on(tty);
2781 }
2782 }
2783
2784 tty->cr();
2785 }
2786
2787 void nmethod::print_recorded_oops() {
2788 const int n = oops_count();
2789 const int log_n = (n<10) ? 1 : (n<100) ? 2 : (n<1000) ? 3 : (n<10000) ? 4 : 6;
2790 tty->print("Recorded oops:");
2791 if (n > 0) {
2792 tty->cr();
2793 for (int i = 0; i < n; i++) {
2794 print_recorded_oop(log_n, i);
2795 }
2796 } else {
2797 tty->print_cr(" <list empty>");
2798 }
2799 }
2800
2801 void nmethod::print_recorded_metadata() {
2802 const int n = metadata_count();
2803 const int log_n = (n<10) ? 1 : (n<100) ? 2 : (n<1000) ? 3 : (n<10000) ? 4 : 6;
2804 tty->print("Recorded metadata:");
2805 if (n > 0) {
2806 tty->cr();
2807 for (int i = 0; i < n; i++) {
2808 Metadata* m = metadata_at(i);
2809 tty->print("#%*d: " INTPTR_FORMAT " ", log_n, i, p2i(m));
2810 if (m == (Metadata*)Universe::non_oop_word()) {
2811 tty->print("non-metadata word");
2812 } else if (m == NULL) {
2813 tty->print("NULL-oop");
2814 } else {
2815 Metadata::print_value_on_maybe_null(tty, m);
2816 }
2817 tty->cr();
2818 }
2819 } else {
2820 tty->print_cr(" <list empty>");
2821 }
2822 }
2823 #endif
2824
2825 #if defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_ABSTRACT_ASSEMBLY)
2826
2827 void nmethod::print_constant_pool(outputStream* st) {
2828 //-----------------------------------
2829 //---< Print the constant pool >---
2830 //-----------------------------------
2831 int consts_size = this->consts_size();
2832 if ( consts_size > 0 ) {
2833 unsigned char* cstart = this->consts_begin();
2834 unsigned char* cp = cstart;
2835 unsigned char* cend = cp + consts_size;
2836 unsigned int bytes_per_line = 4;
2837 unsigned int CP_alignment = 8;
2838 unsigned int n;
2839
2840 st->cr();
2841
2842 //---< print CP header to make clear what's printed >---
2843 if( ((uintptr_t)cp&(CP_alignment-1)) == 0 ) {
2844 n = bytes_per_line;
2845 st->print_cr("[Constant Pool]");
2846 Disassembler::print_location(cp, cstart, cend, st, true, true);
2847 Disassembler::print_hexdata(cp, n, st, true);
2848 st->cr();
2849 } else {
2850 n = (uintptr_t)cp&(bytes_per_line-1);
2851 st->print_cr("[Constant Pool (unaligned)]");
2852 }
2853
2854 //---< print CP contents, bytes_per_line at a time >---
2855 while (cp < cend) {
2856 Disassembler::print_location(cp, cstart, cend, st, true, false);
2857 Disassembler::print_hexdata(cp, n, st, false);
2858 cp += n;
2859 n = bytes_per_line;
2860 st->cr();
2861 }
2862
2863 //---< Show potential alignment gap between constant pool and code >---
2864 cend = code_begin();
2865 if( cp < cend ) {
2866 n = 4;
2867 st->print_cr("[Code entry alignment]");
2868 while (cp < cend) {
2869 Disassembler::print_location(cp, cstart, cend, st, false, false);
2870 cp += n;
2871 st->cr();
2872 }
2873 }
2874 } else {
2875 st->print_cr("[Constant Pool (empty)]");
2876 }
2877 st->cr();
2878 }
2879
2880 #endif
2881
2882 // Disassemble this nmethod.
2883 // Print additional debug information, if requested. This could be code
2884 // comments, block comments, profiling counters, etc.
2885 // The undisassembled format is useful no disassembler library is available.
2886 // The resulting hex dump (with markers) can be disassembled later, or on
2887 // another system, when/where a disassembler library is available.
2888 void nmethod::decode2(outputStream* ost) const {
2889
2890 // Called from frame::back_trace_with_decode without ResourceMark.
2891 ResourceMark rm;
2892
2893 // Make sure we have a valid stream to print on.
2894 outputStream* st = ost ? ost : tty;
2895
2896 #if defined(SUPPORT_ABSTRACT_ASSEMBLY) && ! defined(SUPPORT_ASSEMBLY)
2897 const bool use_compressed_format = true;
2898 const bool compressed_with_comments = use_compressed_format && (AbstractDisassembler::show_comment() ||
2899 AbstractDisassembler::show_block_comment());
2900 #else
2901 const bool use_compressed_format = Disassembler::is_abstract();
2902 const bool compressed_with_comments = use_compressed_format && (AbstractDisassembler::show_comment() ||
2903 AbstractDisassembler::show_block_comment());
2904 #endif
2905
2906 st->cr();
2907 this->print(st);
2908 st->cr();
2909
2910 #if defined(SUPPORT_ASSEMBLY)
2911 //----------------------------------
2912 //---< Print real disassembly >---
2913 //----------------------------------
2914 if (! use_compressed_format) {
2915 Disassembler::decode(const_cast<nmethod*>(this), st);
2916 return;
2917 }
2918 #endif
2919
2920 #if defined(SUPPORT_ABSTRACT_ASSEMBLY)
2921
2922 // Compressed undisassembled disassembly format.
2923 // The following stati are defined/supported:
2924 // = 0 - currently at bol() position, nothing printed yet on current line.
2925 // = 1 - currently at position after print_location().
2926 // > 1 - in the midst of printing instruction stream bytes.
2927 int compressed_format_idx = 0;
2928 int code_comment_column = 0;
2929 const int instr_maxlen = Assembler::instr_maxlen();
2930 const uint tabspacing = 8;
2931 unsigned char* start = this->code_begin();
2932 unsigned char* p = this->code_begin();
2933 unsigned char* end = this->code_end();
2934 unsigned char* pss = p; // start of a code section (used for offsets)
2935
2936 if ((start == NULL) || (end == NULL)) {
2937 st->print_cr("PrintAssembly not possible due to uninitialized section pointers");
2938 return;
2939 }
2940 #endif
2941
2942 #if defined(SUPPORT_ABSTRACT_ASSEMBLY)
2943 //---< plain abstract disassembly, no comments or anything, just section headers >---
2944 if (use_compressed_format && ! compressed_with_comments) {
2945 const_cast<nmethod*>(this)->print_constant_pool(st);
2946
2947 //---< Open the output (Marker for post-mortem disassembler) >---
2948 st->print_cr("[MachCode]");
2949 const char* header = NULL;
2950 address p0 = p;
2951 while (p < end) {
2952 address pp = p;
2953 while ((p < end) && (header == NULL)) {
2954 header = nmethod_section_label(p);
2955 pp = p;
2956 p += Assembler::instr_len(p);
2957 }
2958 if (pp > p0) {
2959 AbstractDisassembler::decode_range_abstract(p0, pp, start, end, st, Assembler::instr_maxlen());
2960 p0 = pp;
2961 p = pp;
2962 header = NULL;
2963 } else if (header != NULL) {
2964 st->bol();
2965 st->print_cr("%s", header);
2966 header = NULL;
2967 }
2968 }
2969 //---< Close the output (Marker for post-mortem disassembler) >---
2970 st->bol();
2971 st->print_cr("[/MachCode]");
2972 return;
2973 }
2974 #endif
2975
2976 #if defined(SUPPORT_ABSTRACT_ASSEMBLY)
2977 //---< abstract disassembly with comments and section headers merged in >---
2978 if (compressed_with_comments) {
2979 const_cast<nmethod*>(this)->print_constant_pool(st);
2980
2981 //---< Open the output (Marker for post-mortem disassembler) >---
2982 st->print_cr("[MachCode]");
2983 while ((p < end) && (p != NULL)) {
2984 const int instruction_size_in_bytes = Assembler::instr_len(p);
2985
2986 //---< Block comments for nmethod. Interrupts instruction stream, if any. >---
2987 // Outputs a bol() before and a cr() after, but only if a comment is printed.
2988 // Prints nmethod_section_label as well.
2989 if (AbstractDisassembler::show_block_comment()) {
2990 print_block_comment(st, p);
2991 if (st->position() == 0) {
2992 compressed_format_idx = 0;
2993 }
2994 }
2995
2996 //---< New location information after line break >---
2997 if (compressed_format_idx == 0) {
2998 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false);
2999 compressed_format_idx = 1;
3000 }
3001
3002 //---< Code comment for current instruction. Address range [p..(p+len)) >---
3003 unsigned char* p_end = p + (ssize_t)instruction_size_in_bytes;
3004 S390_ONLY(if (p_end > end) p_end = end;) // avoid getting past the end
3005
3006 if (AbstractDisassembler::show_comment() && const_cast<nmethod*>(this)->has_code_comment(p, p_end)) {
3007 //---< interrupt instruction byte stream for code comment >---
3008 if (compressed_format_idx > 1) {
3009 st->cr(); // interrupt byte stream
3010 st->cr(); // add an empty line
3011 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false);
3012 }
3013 const_cast<nmethod*>(this)->print_code_comment_on(st, code_comment_column, p, p_end );
3014 st->bol();
3015 compressed_format_idx = 0;
3016 }
3017
3018 //---< New location information after line break >---
3019 if (compressed_format_idx == 0) {
3020 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false);
3021 compressed_format_idx = 1;
3022 }
3023
3024 //---< Nicely align instructions for readability >---
3025 if (compressed_format_idx > 1) {
3026 Disassembler::print_delimiter(st);
3027 }
3028
3029 //---< Now, finally, print the actual instruction bytes >---
3030 unsigned char* p0 = p;
3031 p = Disassembler::decode_instruction_abstract(p, st, instruction_size_in_bytes, instr_maxlen);
3032 compressed_format_idx += p - p0;
3033
3034 if (Disassembler::start_newline(compressed_format_idx-1)) {
3035 st->cr();
3036 compressed_format_idx = 0;
3037 }
3038 }
3039 //---< Close the output (Marker for post-mortem disassembler) >---
3040 st->bol();
3041 st->print_cr("[/MachCode]");
3042 return;
3043 }
3044 #endif
3045 }
3046
3047 #if defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_ABSTRACT_ASSEMBLY)
3048
3049 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
3050 RelocIterator iter(this, begin, end);
3051 bool have_one = false;
3052 while (iter.next()) {
3053 have_one = true;
3054 switch (iter.type()) {
3055 case relocInfo::none: return "no_reloc";
3056 case relocInfo::oop_type: {
3057 // Get a non-resizable resource-allocated stringStream.
3058 // Our callees make use of (nested) ResourceMarks.
3059 stringStream st(NEW_RESOURCE_ARRAY(char, 1024), 1024);
3060 oop_Relocation* r = iter.oop_reloc();
3061 oop obj = r->oop_value();
3062 st.print("oop(");
3063 if (obj == NULL) st.print("NULL");
3064 else obj->print_value_on(&st);
3065 st.print(")");
3066 return st.as_string();
3067 }
3068 case relocInfo::metadata_type: {
3069 stringStream st;
3070 metadata_Relocation* r = iter.metadata_reloc();
3071 Metadata* obj = r->metadata_value();
3072 st.print("metadata(");
3073 if (obj == NULL) st.print("NULL");
3074 else obj->print_value_on(&st);
3075 st.print(")");
3076 return st.as_string();
3077 }
3078 case relocInfo::runtime_call_type:
3079 case relocInfo::runtime_call_w_cp_type: {
3080 stringStream st;
3081 st.print("runtime_call");
3082 CallRelocation* r = (CallRelocation*)iter.reloc();
3083 address dest = r->destination();
3084 CodeBlob* cb = CodeCache::find_blob(dest);
3085 if (cb != NULL) {
3086 st.print(" %s", cb->name());
3087 } else {
3088 ResourceMark rm;
3089 const int buflen = 1024;
3090 char* buf = NEW_RESOURCE_ARRAY(char, buflen);
3091 int offset;
3092 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) {
3093 st.print(" %s", buf);
3094 if (offset != 0) {
3095 st.print("+%d", offset);
3096 }
3097 }
3098 }
3099 return st.as_string();
3100 }
3101 case relocInfo::virtual_call_type: {
3102 stringStream st;
3103 st.print_raw("virtual_call");
3104 virtual_call_Relocation* r = iter.virtual_call_reloc();
3105 Method* m = r->method_value();
3106 if (m != NULL) {
3107 assert(m->is_method(), "");
3108 m->print_short_name(&st);
3109 }
3110 return st.as_string();
3111 }
3112 case relocInfo::opt_virtual_call_type: {
3113 stringStream st;
3114 st.print_raw("optimized virtual_call");
3115 opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc();
3116 Method* m = r->method_value();
3117 if (m != NULL) {
3118 assert(m->is_method(), "");
3119 m->print_short_name(&st);
3120 }
3121 return st.as_string();
3122 }
3123 case relocInfo::static_call_type: {
3124 stringStream st;
3125 st.print_raw("static_call");
3126 static_call_Relocation* r = iter.static_call_reloc();
3127 Method* m = r->method_value();
3128 if (m != NULL) {
3129 assert(m->is_method(), "");
3130 m->print_short_name(&st);
3131 }
3132 return st.as_string();
3133 }
3134 case relocInfo::static_stub_type: return "static_stub";
3135 case relocInfo::external_word_type: return "external_word";
3136 case relocInfo::internal_word_type: return "internal_word";
3137 case relocInfo::section_word_type: return "section_word";
3138 case relocInfo::poll_type: return "poll";
3139 case relocInfo::poll_return_type: return "poll_return";
3140 case relocInfo::trampoline_stub_type: return "trampoline_stub";
3141 case relocInfo::type_mask: return "type_bit_mask";
3142
3143 default:
3144 break;
3145 }
3146 }
3147 return have_one ? "other" : NULL;
3148 }
3149
3150 // Return a the last scope in (begin..end]
3151 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
3152 PcDesc* p = pc_desc_near(begin+1);
3153 if (p != NULL && p->real_pc(this) <= end) {
3154 return new ScopeDesc(this, p);
3155 }
3156 return NULL;
3157 }
3158
3159 const char* nmethod::nmethod_section_label(address pos) const {
3160 const char* label = NULL;
3161 if (pos == code_begin()) label = "[Instructions begin]";
3162 if (pos == entry_point()) label = "[Entry Point]";
3163 if (pos == inline_entry_point()) label = "[Inline Entry Point]";
3164 if (pos == verified_entry_point()) label = "[Verified Entry Point]";
3165 if (pos == verified_inline_entry_point()) label = "[Verified Inline Entry Point]";
3166 if (pos == verified_inline_ro_entry_point()) label = "[Verified Inline Entry Point (RO)]";
3167 if (has_method_handle_invokes() && (pos == deopt_mh_handler_begin())) label = "[Deopt MH Handler Code]";
3168 if (pos == consts_begin() && pos != insts_begin()) label = "[Constants]";
3169 // Check stub_code before checking exception_handler or deopt_handler.
3170 if (pos == this->stub_begin()) label = "[Stub Code]";
3171 if (JVMCI_ONLY(_exception_offset >= 0 &&) pos == exception_begin()) label = "[Exception Handler]";
3172 if (JVMCI_ONLY(_deopt_handler_begin != NULL &&) pos == deopt_handler_begin()) label = "[Deopt Handler Code]";
3173 return label;
3174 }
3175
3176 static int maybe_print_entry_label(outputStream* stream, address pos, address entry, const char* label) {
3177 if (pos == entry) {
3178 stream->bol();
3179 stream->print_cr("%s", label);
3180 return 1;
3181 } else {
3182 return 0;
3183 }
3184 }
3185
3186 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin, bool print_section_labels) const {
3187 if (print_section_labels) {
3188 int n = 0;
3189 // Multiple entry points may be at the same position. Print them all.
3190 n += maybe_print_entry_label(stream, block_begin, entry_point(), "[Entry Point]");
3191 n += maybe_print_entry_label(stream, block_begin, inline_entry_point(), "[Inline Entry Point]");
3192 n += maybe_print_entry_label(stream, block_begin, verified_entry_point(), "[Verified Entry Point]");
3193 n += maybe_print_entry_label(stream, block_begin, verified_inline_entry_point(), "[Verified Inline Entry Point]");
3194 n += maybe_print_entry_label(stream, block_begin, verified_inline_ro_entry_point(), "[Verified Inline Entry Point (RO)]");
3195 if (n == 0) {
3196 const char* label = nmethod_section_label(block_begin);
3197 if (label != NULL) {
3198 stream->bol();
3199 stream->print_cr("%s", label);
3200 }
3201 }
3202 }
3203
3204 if (_nmethod_to_print != this) {
3205 return;
3206 }
3207 Method* m = method();
3208 if (m == NULL || is_osr_method()) {
3209 return;
3210 }
3211
3212 // Print the name of the method (only once)
3213 address low = MIN4(entry_point(), verified_entry_point(), verified_inline_entry_point(), verified_inline_ro_entry_point());
3214 low = MIN2(low, inline_entry_point());
3215 assert(low != 0, "sanity");
3216 if (block_begin == low) {
3217 stream->print(" # ");
3218 m->print_value_on(stream);
3219 stream->cr();
3220 }
3221
3222 // Print the arguments for the 3 types of verified entry points
3223 const CompiledEntrySignature* ces = _nmethod_to_print_ces;
3224 const GrowableArray<SigEntry>* sig_cc;
3225 const VMRegPair* regs;
3226 if (block_begin == verified_entry_point()) {
3227 sig_cc = &ces->sig_cc();
3228 regs = ces->regs_cc();
3229 } else if (block_begin == verified_inline_entry_point()) {
3230 sig_cc = &ces->sig();
3231 regs = ces->regs();
3232 } else if (block_begin == verified_inline_ro_entry_point()) {
3233 sig_cc = &ces->sig_cc_ro();
3234 regs = ces->regs_cc_ro();
3235 } else {
3236 return;
3237 }
3238
3239 bool has_this = !m->is_static();
3240 if (ces->has_inline_recv() && block_begin == verified_entry_point()) {
3241 // <this> argument is scalarized for verified_entry_point()
3242 has_this = false;
3243 }
3244 const char* spname = "sp"; // make arch-specific?
3245 int stack_slot_offset = this->frame_size() * wordSize;
3246 int tab1 = 14, tab2 = 24;
3247 int sig_index = 0;
3248 int arg_index = has_this ? -1 : 0;
3249 bool did_old_sp = false;
3250 for (ExtendedSignature sig = ExtendedSignature(sig_cc, SigEntryFilter()); !sig.at_end(); ++sig) {
3251 bool at_this = (arg_index == -1);
3252 bool at_old_sp = false;
3253 BasicType t = (*sig)._bt;
3254 if (at_this) {
3255 stream->print(" # this: ");
3256 } else {
3257 stream->print(" # parm%d: ", arg_index);
3258 }
3259 stream->move_to(tab1);
3260 VMReg fst = regs[sig_index].first();
3261 VMReg snd = regs[sig_index].second();
3262 if (fst->is_reg()) {
3263 stream->print("%s", fst->name());
3264 if (snd->is_valid()) {
3265 stream->print(":%s", snd->name());
3266 }
3267 } else if (fst->is_stack()) {
3268 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
3269 if (offset == stack_slot_offset) at_old_sp = true;
3270 stream->print("[%s+0x%x]", spname, offset);
3271 } else {
3272 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
3273 }
3274 stream->print(" ");
3275 stream->move_to(tab2);
3276 stream->print("= ");
3277 if (at_this) {
3278 m->method_holder()->print_value_on(stream);
3279 } else {
3280 bool did_name = false;
3281 if (is_reference_type(t)) {
3282 Symbol* name = (*sig)._symbol;
3283 name->print_value_on(stream);
3284 did_name = true;
3285 }
3286 if (!did_name)
3287 stream->print("%s", type2name(t));
3288 }
3289 if (at_old_sp) {
3290 stream->print(" (%s of caller)", spname);
3291 did_old_sp = true;
3292 }
3293 stream->cr();
3294 sig_index += type2size[t];
3295 arg_index += 1;
3296 }
3297 if (!did_old_sp) {
3298 stream->print(" # ");
3299 stream->move_to(tab1);
3300 stream->print("[%s+0x%x]", spname, stack_slot_offset);
3301 stream->print(" (%s of caller)", spname);
3302 stream->cr();
3303 }
3304 }
3305
3306 // Returns whether this nmethod has code comments.
3307 bool nmethod::has_code_comment(address begin, address end) {
3308 // scopes?
3309 ScopeDesc* sd = scope_desc_in(begin, end);
3310 if (sd != NULL) return true;
3311
3312 // relocations?
3313 const char* str = reloc_string_for(begin, end);
3314 if (str != NULL) return true;
3315
3316 // implicit exceptions?
3317 int cont_offset = ImplicitExceptionTable(this).continuation_offset(begin - code_begin());
3318 if (cont_offset != 0) return true;
3319
3320 return false;
3321 }
3322
3323 void nmethod::print_code_comment_on(outputStream* st, int column, address begin, address end) {
3324 ImplicitExceptionTable implicit_table(this);
3325 int pc_offset = begin - code_begin();
3326 int cont_offset = implicit_table.continuation_offset(pc_offset);
3327 bool oop_map_required = false;
3328 if (cont_offset != 0) {
3329 st->move_to(column, 6, 0);
3330 if (pc_offset == cont_offset) {
3331 st->print("; implicit exception: deoptimizes");
3332 oop_map_required = true;
3333 } else {
3334 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset));
3335 }
3336 }
3337
3338 // Find an oopmap in (begin, end]. We use the odd half-closed
3339 // interval so that oop maps and scope descs which are tied to the
3340 // byte after a call are printed with the call itself. OopMaps
3341 // associated with implicit exceptions are printed with the implicit
3342 // instruction.
3343 address base = code_begin();
3344 ImmutableOopMapSet* oms = oop_maps();
3345 if (oms != NULL) {
3346 for (int i = 0, imax = oms->count(); i < imax; i++) {
3347 const ImmutableOopMapPair* pair = oms->pair_at(i);
3348 const ImmutableOopMap* om = pair->get_from(oms);
3349 address pc = base + pair->pc_offset();
3350 if (pc >= begin) {
3351 #if INCLUDE_JVMCI
3352 bool is_implicit_deopt = implicit_table.continuation_offset(pair->pc_offset()) == (uint) pair->pc_offset();
3353 #else
3354 bool is_implicit_deopt = false;
3355 #endif
3356 if (is_implicit_deopt ? pc == begin : pc > begin && pc <= end) {
3357 st->move_to(column, 6, 0);
3358 st->print("; ");
3359 om->print_on(st);
3360 oop_map_required = false;
3361 }
3362 }
3363 if (pc > end) {
3364 break;
3365 }
3366 }
3367 }
3368 assert(!oop_map_required, "missed oopmap");
3369
3370 Thread* thread = Thread::current();
3371
3372 // Print any debug info present at this pc.
3373 ScopeDesc* sd = scope_desc_in(begin, end);
3374 if (sd != NULL) {
3375 st->move_to(column, 6, 0);
3376 if (sd->bci() == SynchronizationEntryBCI) {
3377 st->print(";*synchronization entry");
3378 } else if (sd->bci() == AfterBci) {
3379 st->print(";* method exit (unlocked if synchronized)");
3380 } else if (sd->bci() == UnwindBci) {
3381 st->print(";* unwind (locked if synchronized)");
3382 } else if (sd->bci() == AfterExceptionBci) {
3383 st->print(";* unwind (unlocked if synchronized)");
3384 } else if (sd->bci() == UnknownBci) {
3385 st->print(";* unknown");
3386 } else if (sd->bci() == InvalidFrameStateBci) {
3387 st->print(";* invalid frame state");
3388 } else {
3389 if (sd->method() == NULL) {
3390 st->print("method is NULL");
3391 } else if (sd->method()->is_native()) {
3392 st->print("method is native");
3393 } else {
3394 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci());
3395 st->print(";*%s", Bytecodes::name(bc));
3396 switch (bc) {
3397 case Bytecodes::_invokevirtual:
3398 case Bytecodes::_invokespecial:
3399 case Bytecodes::_invokestatic:
3400 case Bytecodes::_invokeinterface:
3401 {
3402 Bytecode_invoke invoke(methodHandle(thread, sd->method()), sd->bci());
3403 st->print(" ");
3404 if (invoke.name() != NULL)
3405 invoke.name()->print_symbol_on(st);
3406 else
3407 st->print("<UNKNOWN>");
3408 break;
3409 }
3410 case Bytecodes::_getfield:
3411 case Bytecodes::_putfield:
3412 case Bytecodes::_getstatic:
3413 case Bytecodes::_putstatic:
3414 {
3415 Bytecode_field field(methodHandle(thread, sd->method()), sd->bci());
3416 st->print(" ");
3417 if (field.name() != NULL)
3418 field.name()->print_symbol_on(st);
3419 else
3420 st->print("<UNKNOWN>");
3421 }
3422 default:
3423 break;
3424 }
3425 }
3426 st->print(" {reexecute=%d rethrow=%d return_oop=%d return_scalarized=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop(), sd->return_scalarized());
3427 }
3428
3429 // Print all scopes
3430 for (;sd != NULL; sd = sd->sender()) {
3431 st->move_to(column, 6, 0);
3432 st->print("; -");
3433 if (sd->should_reexecute()) {
3434 st->print(" (reexecute)");
3435 }
3436 if (sd->method() == NULL) {
3437 st->print("method is NULL");
3438 } else {
3439 sd->method()->print_short_name(st);
3440 }
3441 int lineno = sd->method()->line_number_from_bci(sd->bci());
3442 if (lineno != -1) {
3443 st->print("@%d (line %d)", sd->bci(), lineno);
3444 } else {
3445 st->print("@%d", sd->bci());
3446 }
3447 st->cr();
3448 }
3449 }
3450
3451 // Print relocation information
3452 // Prevent memory leak: allocating without ResourceMark.
3453 ResourceMark rm;
3454 const char* str = reloc_string_for(begin, end);
3455 if (str != NULL) {
3456 if (sd != NULL) st->cr();
3457 st->move_to(column, 6, 0);
3458 st->print("; {%s}", str);
3459 }
3460 }
3461
3462 #endif
3463
3464 class DirectNativeCallWrapper: public NativeCallWrapper {
3465 private:
3466 NativeCall* _call;
3467
3468 public:
3469 DirectNativeCallWrapper(NativeCall* call) : _call(call) {}
3470
3471 virtual address destination() const { return _call->destination(); }
3472 virtual address instruction_address() const { return _call->instruction_address(); }
3473 virtual address next_instruction_address() const { return _call->next_instruction_address(); }
3474 virtual address return_address() const { return _call->return_address(); }
3475
3476 virtual address get_resolve_call_stub(bool is_optimized) const {
3477 if (is_optimized) {
3478 return SharedRuntime::get_resolve_opt_virtual_call_stub();
3479 }
3480 return SharedRuntime::get_resolve_virtual_call_stub();
3481 }
3482
3483 virtual void set_destination_mt_safe(address dest) {
3484 _call->set_destination_mt_safe(dest);
3485 }
3486
3487 virtual void set_to_interpreted(const methodHandle& method, CompiledICInfo& info) {
3488 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address());
3489 {
3490 csc->set_to_interpreted(method, info.entry());
3491 }
3492 }
3493
3494 virtual void verify() const {
3495 // make sure code pattern is actually a call imm32 instruction
3496 _call->verify();
3497 _call->verify_alignment();
3498 }
3499
3500 virtual void verify_resolve_call(address dest) const {
3501 CodeBlob* db = CodeCache::find_blob_unsafe(dest);
3502 assert(db != NULL && !db->is_adapter_blob(), "must use stub!");
3503 }
3504
3505 virtual bool is_call_to_interpreted(address dest) const {
3506 CodeBlob* cb = CodeCache::find_blob(_call->instruction_address());
3507 return cb->contains(dest);
3508 }
3509
3510 virtual bool is_safe_for_patching() const { return false; }
3511
3512 virtual NativeInstruction* get_load_instruction(virtual_call_Relocation* r) const {
3513 return nativeMovConstReg_at(r->cached_value());
3514 }
3515
3516 virtual void *get_data(NativeInstruction* instruction) const {
3517 return (void*)((NativeMovConstReg*) instruction)->data();
3518 }
3519
3520 virtual void set_data(NativeInstruction* instruction, intptr_t data) {
3521 ((NativeMovConstReg*) instruction)->set_data(data);
3522 }
3523 };
3524
3525 NativeCallWrapper* nmethod::call_wrapper_at(address call) const {
3526 return new DirectNativeCallWrapper((NativeCall*) call);
3527 }
3528
3529 NativeCallWrapper* nmethod::call_wrapper_before(address return_pc) const {
3530 return new DirectNativeCallWrapper(nativeCall_before(return_pc));
3531 }
3532
3533 address nmethod::call_instruction_address(address pc) const {
3534 if (NativeCall::is_call_before(pc)) {
3535 NativeCall *ncall = nativeCall_before(pc);
3536 return ncall->instruction_address();
3537 }
3538 return NULL;
3539 }
3540
3541 CompiledStaticCall* nmethod::compiledStaticCall_at(Relocation* call_site) const {
3542 return CompiledDirectStaticCall::at(call_site);
3543 }
3544
3545 CompiledStaticCall* nmethod::compiledStaticCall_at(address call_site) const {
3546 return CompiledDirectStaticCall::at(call_site);
3547 }
3548
3549 CompiledStaticCall* nmethod::compiledStaticCall_before(address return_addr) const {
3550 return CompiledDirectStaticCall::before(return_addr);
3551 }
3552
3553 #if defined(SUPPORT_DATA_STRUCTS)
3554 void nmethod::print_value_on(outputStream* st) const {
3555 st->print("nmethod");
3556 print_on(st, NULL);
3557 }
3558 #endif
3559
3560 #ifndef PRODUCT
3561
3562 void nmethod::print_calls(outputStream* st) {
3563 RelocIterator iter(this);
3564 while (iter.next()) {
3565 switch (iter.type()) {
3566 case relocInfo::virtual_call_type:
3567 case relocInfo::opt_virtual_call_type: {
3568 CompiledICLocker ml_verify(this);
3569 CompiledIC_at(&iter)->print();
3570 break;
3571 }
3572 case relocInfo::static_call_type:
3573 st->print_cr("Static call at " INTPTR_FORMAT, p2i(iter.reloc()->addr()));
3574 CompiledDirectStaticCall::at(iter.reloc())->print();
3575 break;
3576 default:
3577 break;
3578 }
3579 }
3580 }
3581
3582 void nmethod::print_statistics() {
3583 ttyLocker ttyl;
3584 if (xtty != NULL) xtty->head("statistics type='nmethod'");
3585 native_nmethod_stats.print_native_nmethod_stats();
3586 #ifdef COMPILER1
3587 c1_java_nmethod_stats.print_nmethod_stats("C1");
3588 #endif
3589 #ifdef COMPILER2
3590 c2_java_nmethod_stats.print_nmethod_stats("C2");
3591 #endif
3592 #if INCLUDE_JVMCI
3593 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI");
3594 #endif
3595 unknown_java_nmethod_stats.print_nmethod_stats("Unknown");
3596 DebugInformationRecorder::print_statistics();
3597 #ifndef PRODUCT
3598 pc_nmethod_stats.print_pc_stats();
3599 #endif
3600 Dependencies::print_statistics();
3601 if (xtty != NULL) xtty->tail("statistics");
3602 }
3603
3604 #endif // !PRODUCT
3605
3606 #if INCLUDE_JVMCI
3607 void nmethod::update_speculation(JavaThread* thread) {
3608 jlong speculation = thread->pending_failed_speculation();
3609 if (speculation != 0) {
3610 guarantee(jvmci_nmethod_data() != NULL, "failed speculation in nmethod without failed speculation list");
3611 jvmci_nmethod_data()->add_failed_speculation(this, speculation);
3612 thread->set_pending_failed_speculation(0);
3613 }
3614 }
3615
3616 const char* nmethod::jvmci_name() {
3617 if (jvmci_nmethod_data() != NULL) {
3618 return jvmci_nmethod_data()->name();
3619 }
3620 return NULL;
3621 }
3622 #endif