1 /*
2 * Copyright (c) 1997, 2019, 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 "interpreter/bytecode.hpp"
42 #include "logging/log.hpp"
43 #include "logging/logStream.hpp"
44 #include "memory/allocation.inline.hpp"
45 #include "memory/resourceArea.hpp"
46 #include "memory/universe.hpp"
47 #include "oops/access.inline.hpp"
48 #include "oops/method.inline.hpp"
49 #include "oops/methodData.hpp"
50 #include "oops/oop.inline.hpp"
51 #include "prims/jvmtiImpl.hpp"
52 #include "runtime/atomic.hpp"
53 #include "runtime/flags/flagSetting.hpp"
54 #include "runtime/frame.inline.hpp"
55 #include "runtime/handles.inline.hpp"
56 #include "runtime/jniHandles.inline.hpp"
57 #include "runtime/orderAccess.hpp"
58 #include "runtime/os.hpp"
59 #include "runtime/safepointVerifiers.hpp"
60 #include "runtime/sharedRuntime.hpp"
61 #include "runtime/sweeper.hpp"
62 #include "runtime/vmThread.hpp"
63 #include "utilities/align.hpp"
64 #include "utilities/dtrace.hpp"
65 #include "utilities/events.hpp"
66 #include "utilities/resourceHash.hpp"
67 #include "utilities/xmlstream.hpp"
68 #if INCLUDE_JVMCI
69 #include "jvmci/jvmciRuntime.hpp"
70 #endif
71
72 #ifdef DTRACE_ENABLED
73
74 // Only bother with this argument setup if dtrace is available
75
76 #define DTRACE_METHOD_UNLOAD_PROBE(method) \
77 { \
78 Method* m = (method); \
79 if (m != NULL) { \
80 Symbol* klass_name = m->klass_name(); \
81 Symbol* name = m->name(); \
82 Symbol* signature = m->signature(); \
83 HOTSPOT_COMPILED_METHOD_UNLOAD( \
84 (char *) klass_name->bytes(), klass_name->utf8_length(), \
85 (char *) name->bytes(), name->utf8_length(), \
86 (char *) signature->bytes(), signature->utf8_length()); \
87 } \
88 }
89
90 #else // ndef DTRACE_ENABLED
91
92 #define DTRACE_METHOD_UNLOAD_PROBE(method)
93
94 #endif
95
96 //---------------------------------------------------------------------------------
97 // NMethod statistics
98 // They are printed under various flags, including:
99 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation.
100 // (In the latter two cases, they like other stats are printed to the log only.)
101
102 #ifndef PRODUCT
103 // These variables are put into one block to reduce relocations
104 // and make it simpler to print from the debugger.
105 struct java_nmethod_stats_struct {
106 int nmethod_count;
107 int total_size;
108 int relocation_size;
109 int consts_size;
110 int insts_size;
111 int stub_size;
112 int scopes_data_size;
113 int scopes_pcs_size;
114 int dependencies_size;
115 int handler_table_size;
116 int nul_chk_table_size;
117 #if INCLUDE_JVMCI
118 int speculations_size;
119 int jvmci_data_size;
120 #endif
121 int oops_size;
122 int metadata_size;
123
124 void note_nmethod(nmethod* nm) {
125 nmethod_count += 1;
126 total_size += nm->size();
127 relocation_size += nm->relocation_size();
128 consts_size += nm->consts_size();
129 insts_size += nm->insts_size();
130 stub_size += nm->stub_size();
131 oops_size += nm->oops_size();
132 metadata_size += nm->metadata_size();
133 scopes_data_size += nm->scopes_data_size();
134 scopes_pcs_size += nm->scopes_pcs_size();
135 dependencies_size += nm->dependencies_size();
136 handler_table_size += nm->handler_table_size();
137 nul_chk_table_size += nm->nul_chk_table_size();
138 #if INCLUDE_JVMCI
139 speculations_size += nm->speculations_size();
140 jvmci_data_size += nm->jvmci_data_size();
141 #endif
142 }
143 void print_nmethod_stats(const char* name) {
144 if (nmethod_count == 0) return;
145 tty->print_cr("Statistics for %d bytecoded nmethods for %s:", nmethod_count, name);
146 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size);
147 if (nmethod_count != 0) tty->print_cr(" header = " SIZE_FORMAT, nmethod_count * sizeof(nmethod));
148 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size);
149 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size);
150 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size);
151 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size);
152 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size);
153 if (metadata_size != 0) tty->print_cr(" metadata = %d", metadata_size);
154 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size);
155 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size);
156 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size);
157 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size);
158 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size);
159 #if INCLUDE_JVMCI
160 if (speculations_size != 0) tty->print_cr(" speculations = %d", speculations_size);
161 if (jvmci_data_size != 0) tty->print_cr(" JVMCI data = %d", jvmci_data_size);
162 #endif
163 }
164 };
165
166 struct native_nmethod_stats_struct {
167 int native_nmethod_count;
168 int native_total_size;
169 int native_relocation_size;
170 int native_insts_size;
171 int native_oops_size;
172 int native_metadata_size;
173 void note_native_nmethod(nmethod* nm) {
174 native_nmethod_count += 1;
175 native_total_size += nm->size();
176 native_relocation_size += nm->relocation_size();
177 native_insts_size += nm->insts_size();
178 native_oops_size += nm->oops_size();
179 native_metadata_size += nm->metadata_size();
180 }
181 void print_native_nmethod_stats() {
182 if (native_nmethod_count == 0) return;
183 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count);
184 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size);
185 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size);
186 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size);
187 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size);
188 if (native_metadata_size != 0) tty->print_cr(" N. metadata = %d", native_metadata_size);
189 }
190 };
191
192 struct pc_nmethod_stats_struct {
193 int pc_desc_resets; // number of resets (= number of caches)
194 int pc_desc_queries; // queries to nmethod::find_pc_desc
195 int pc_desc_approx; // number of those which have approximate true
196 int pc_desc_repeats; // number of _pc_descs[0] hits
197 int pc_desc_hits; // number of LRU cache hits
198 int pc_desc_tests; // total number of PcDesc examinations
199 int pc_desc_searches; // total number of quasi-binary search steps
200 int pc_desc_adds; // number of LUR cache insertions
201
202 void print_pc_stats() {
203 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query",
204 pc_desc_queries,
205 (double)(pc_desc_tests + pc_desc_searches)
206 / pc_desc_queries);
207 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d",
208 pc_desc_resets,
209 pc_desc_queries, pc_desc_approx,
210 pc_desc_repeats, pc_desc_hits,
211 pc_desc_tests, pc_desc_searches, pc_desc_adds);
212 }
213 };
214
215 #ifdef COMPILER1
216 static java_nmethod_stats_struct c1_java_nmethod_stats;
217 #endif
218 #ifdef COMPILER2
219 static java_nmethod_stats_struct c2_java_nmethod_stats;
220 #endif
221 #if INCLUDE_JVMCI
222 static java_nmethod_stats_struct jvmci_java_nmethod_stats;
223 #endif
224 static java_nmethod_stats_struct unknown_java_nmethod_stats;
225
226 static native_nmethod_stats_struct native_nmethod_stats;
227 static pc_nmethod_stats_struct pc_nmethod_stats;
228
229 static void note_java_nmethod(nmethod* nm) {
230 #ifdef COMPILER1
231 if (nm->is_compiled_by_c1()) {
232 c1_java_nmethod_stats.note_nmethod(nm);
233 } else
234 #endif
235 #ifdef COMPILER2
236 if (nm->is_compiled_by_c2()) {
237 c2_java_nmethod_stats.note_nmethod(nm);
238 } else
239 #endif
240 #if INCLUDE_JVMCI
241 if (nm->is_compiled_by_jvmci()) {
242 jvmci_java_nmethod_stats.note_nmethod(nm);
243 } else
244 #endif
245 {
246 unknown_java_nmethod_stats.note_nmethod(nm);
247 }
248 }
249 #endif // !PRODUCT
250
251 //---------------------------------------------------------------------------------
252
253
254 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) {
255 assert(pc != NULL, "Must be non null");
256 assert(exception.not_null(), "Must be non null");
257 assert(handler != NULL, "Must be non null");
258
259 _count = 0;
260 _exception_type = exception->klass();
261 _next = NULL;
262 _purge_list_next = NULL;
263
264 add_address_and_handler(pc,handler);
265 }
266
267
268 address ExceptionCache::match(Handle exception, address pc) {
269 assert(pc != NULL,"Must be non null");
270 assert(exception.not_null(),"Must be non null");
271 if (exception->klass() == exception_type()) {
272 return (test_address(pc));
273 }
274
275 return NULL;
276 }
277
278
279 bool ExceptionCache::match_exception_with_space(Handle exception) {
280 assert(exception.not_null(),"Must be non null");
281 if (exception->klass() == exception_type() && count() < cache_size) {
282 return true;
283 }
284 return false;
285 }
286
287
288 address ExceptionCache::test_address(address addr) {
289 int limit = count();
290 for (int i = 0; i < limit; i++) {
291 if (pc_at(i) == addr) {
292 return handler_at(i);
293 }
294 }
295 return NULL;
296 }
297
298
299 bool ExceptionCache::add_address_and_handler(address addr, address handler) {
300 if (test_address(addr) == handler) return true;
301
302 int index = count();
303 if (index < cache_size) {
304 set_pc_at(index, addr);
305 set_handler_at(index, handler);
306 increment_count();
307 return true;
308 }
309 return false;
310 }
311
312 ExceptionCache* ExceptionCache::next() {
313 return Atomic::load(&_next);
314 }
315
316 void ExceptionCache::set_next(ExceptionCache *ec) {
317 Atomic::store(ec, &_next);
318 }
319
320 //-----------------------------------------------------------------------------
321
322
323 // Helper used by both find_pc_desc methods.
324 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) {
325 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_tests);
326 if (!approximate)
327 return pc->pc_offset() == pc_offset;
328 else
329 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset();
330 }
331
332 void PcDescCache::reset_to(PcDesc* initial_pc_desc) {
333 if (initial_pc_desc == NULL) {
334 _pc_descs[0] = NULL; // native method; no PcDescs at all
335 return;
336 }
337 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_resets);
338 // reset the cache by filling it with benign (non-null) values
339 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel");
340 for (int i = 0; i < cache_size; i++)
341 _pc_descs[i] = initial_pc_desc;
342 }
343
344 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) {
345 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_queries);
346 NOT_PRODUCT(if (approximate) ++pc_nmethod_stats.pc_desc_approx);
347
348 // Note: one might think that caching the most recently
349 // read value separately would be a win, but one would be
350 // wrong. When many threads are updating it, the cache
351 // line it's in would bounce between caches, negating
352 // any benefit.
353
354 // In order to prevent race conditions do not load cache elements
355 // repeatedly, but use a local copy:
356 PcDesc* res;
357
358 // Step one: Check the most recently added value.
359 res = _pc_descs[0];
360 if (res == NULL) return NULL; // native method; no PcDescs at all
361 if (match_desc(res, pc_offset, approximate)) {
362 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_repeats);
363 return res;
364 }
365
366 // Step two: Check the rest of the LRU cache.
367 for (int i = 1; i < cache_size; ++i) {
368 res = _pc_descs[i];
369 if (res->pc_offset() < 0) break; // optimization: skip empty cache
370 if (match_desc(res, pc_offset, approximate)) {
371 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_hits);
372 return res;
373 }
374 }
375
376 // Report failure.
377 return NULL;
378 }
379
380 void PcDescCache::add_pc_desc(PcDesc* pc_desc) {
381 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_adds);
382 // Update the LRU cache by shifting pc_desc forward.
383 for (int i = 0; i < cache_size; i++) {
384 PcDesc* next = _pc_descs[i];
385 _pc_descs[i] = pc_desc;
386 pc_desc = next;
387 }
388 }
389
390 // adjust pcs_size so that it is a multiple of both oopSize and
391 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple
392 // of oopSize, then 2*sizeof(PcDesc) is)
393 static int adjust_pcs_size(int pcs_size) {
394 int nsize = align_up(pcs_size, oopSize);
395 if ((nsize % sizeof(PcDesc)) != 0) {
396 nsize = pcs_size + sizeof(PcDesc);
397 }
398 assert((nsize % oopSize) == 0, "correct alignment");
399 return nsize;
400 }
401
402
403 int nmethod::total_size() const {
404 return
405 consts_size() +
406 insts_size() +
407 stub_size() +
408 scopes_data_size() +
409 scopes_pcs_size() +
410 handler_table_size() +
411 nul_chk_table_size();
412 }
413
414 address* nmethod::orig_pc_addr(const frame* fr) {
415 return (address*) ((address)fr->unextended_sp() + _orig_pc_offset);
416 }
417
418 const char* nmethod::compile_kind() const {
419 if (is_osr_method()) return "osr";
420 if (method() != NULL && is_native_method()) return "c2n";
421 return NULL;
422 }
423
424 // Fill in default values for various flag fields
425 void nmethod::init_defaults() {
426 _state = not_installed;
427 _has_flushed_dependencies = 0;
428 _lock_count = 0;
429 _stack_traversal_mark = 0;
430 _unload_reported = false; // jvmti state
431 _is_far_code = false; // nmethods are located in CodeCache
432
433 #ifdef ASSERT
434 _oops_are_stale = false;
435 #endif
436
437 _oops_do_mark_link = NULL;
438 _jmethod_id = NULL;
439 _osr_link = NULL;
440 #if INCLUDE_RTM_OPT
441 _rtm_state = NoRTM;
442 #endif
443 }
444
445 nmethod* nmethod::new_native_nmethod(const methodHandle& method,
446 int compile_id,
447 CodeBuffer *code_buffer,
448 int vep_offset,
449 int frame_complete,
450 int frame_size,
451 ByteSize basic_lock_owner_sp_offset,
452 ByteSize basic_lock_sp_offset,
453 OopMapSet* oop_maps) {
454 code_buffer->finalize_oop_references(method);
455 // create nmethod
456 nmethod* nm = NULL;
457 {
458 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
459 int native_nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod));
460
461 CodeOffsets offsets;
462 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
463 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
464 nm = new (native_nmethod_size, CompLevel_none)
465 nmethod(method(), compiler_none, native_nmethod_size,
466 compile_id, &offsets,
467 code_buffer, frame_size,
468 basic_lock_owner_sp_offset,
469 basic_lock_sp_offset,
470 oop_maps);
471 NOT_PRODUCT(if (nm != NULL) native_nmethod_stats.note_native_nmethod(nm));
472 }
473
474 if (nm != NULL) {
475 // verify nmethod
476 debug_only(nm->verify();) // might block
477
478 nm->log_new_nmethod();
479 nm->make_in_use();
480 }
481 return nm;
482 }
483
484 nmethod* nmethod::new_nmethod(const methodHandle& method,
485 int compile_id,
486 int entry_bci,
487 CodeOffsets* offsets,
488 int orig_pc_offset,
489 DebugInformationRecorder* debug_info,
490 Dependencies* dependencies,
491 CodeBuffer* code_buffer, int frame_size,
492 OopMapSet* oop_maps,
493 ExceptionHandlerTable* handler_table,
494 ImplicitExceptionTable* nul_chk_table,
495 AbstractCompiler* compiler,
496 int comp_level
497 #if INCLUDE_JVMCI
498 , char* speculations,
499 int speculations_len,
500 int nmethod_mirror_index,
501 const char* nmethod_mirror_name,
502 FailedSpeculation** failed_speculations
503 #endif
504 )
505 {
506 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
507 code_buffer->finalize_oop_references(method);
508 // create nmethod
509 nmethod* nm = NULL;
510 { MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
511 #if INCLUDE_JVMCI
512 int jvmci_data_size = !compiler->is_jvmci() ? 0 : JVMCINMethodData::compute_size(nmethod_mirror_name);
513 #endif
514 int nmethod_size =
515 CodeBlob::allocation_size(code_buffer, sizeof(nmethod))
516 + adjust_pcs_size(debug_info->pcs_size())
517 + align_up((int)dependencies->size_in_bytes(), oopSize)
518 + align_up(handler_table->size_in_bytes() , oopSize)
519 + align_up(nul_chk_table->size_in_bytes() , oopSize)
520 #if INCLUDE_JVMCI
521 + align_up(speculations_len , oopSize)
522 + align_up(jvmci_data_size , oopSize)
523 #endif
524 + align_up(debug_info->data_size() , oopSize);
525
526 nm = new (nmethod_size, comp_level)
527 nmethod(method(), compiler->type(), nmethod_size, compile_id, entry_bci, offsets,
528 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size,
529 oop_maps,
530 handler_table,
531 nul_chk_table,
532 compiler,
533 comp_level
534 #if INCLUDE_JVMCI
535 , speculations,
536 speculations_len,
537 jvmci_data_size
538 #endif
539 );
540
541 if (nm != NULL) {
542 #if INCLUDE_JVMCI
543 if (compiler->is_jvmci()) {
544 // Initialize the JVMCINMethodData object inlined into nm
545 nm->jvmci_nmethod_data()->initialize(nmethod_mirror_index, nmethod_mirror_name, failed_speculations);
546 }
547 #endif
548 // To make dependency checking during class loading fast, record
549 // the nmethod dependencies in the classes it is dependent on.
550 // This allows the dependency checking code to simply walk the
551 // class hierarchy above the loaded class, checking only nmethods
552 // which are dependent on those classes. The slow way is to
553 // check every nmethod for dependencies which makes it linear in
554 // the number of methods compiled. For applications with a lot
555 // classes the slow way is too slow.
556 for (Dependencies::DepStream deps(nm); deps.next(); ) {
557 if (deps.type() == Dependencies::call_site_target_value) {
558 // CallSite dependencies are managed on per-CallSite instance basis.
559 oop call_site = deps.argument_oop(0);
560 MethodHandles::add_dependent_nmethod(call_site, nm);
561 } else {
562 Klass* klass = deps.context_type();
563 if (klass == NULL) {
564 continue; // ignore things like evol_method
565 }
566 // record this nmethod as dependent on this klass
567 InstanceKlass::cast(klass)->add_dependent_nmethod(nm);
568 }
569 }
570 NOT_PRODUCT(if (nm != NULL) note_java_nmethod(nm));
571 }
572 }
573 // Do verification and logging outside CodeCache_lock.
574 if (nm != NULL) {
575 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
576 DEBUG_ONLY(nm->verify();)
577 nm->log_new_nmethod();
578 }
579 return nm;
580 }
581
582 // For native wrappers
583 nmethod::nmethod(
584 Method* method,
585 CompilerType type,
586 int nmethod_size,
587 int compile_id,
588 CodeOffsets* offsets,
589 CodeBuffer* code_buffer,
590 int frame_size,
591 ByteSize basic_lock_owner_sp_offset,
592 ByteSize basic_lock_sp_offset,
593 OopMapSet* oop_maps )
594 : CompiledMethod(method, "native nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false),
595 _is_unloading_state(0),
596 _native_receiver_sp_offset(basic_lock_owner_sp_offset),
597 _native_basic_lock_sp_offset(basic_lock_sp_offset)
598 {
599 {
600 int scopes_data_offset = 0;
601 int deoptimize_offset = 0;
602 int deoptimize_mh_offset = 0;
603
604 debug_only(NoSafepointVerifier nsv;)
605 assert_locked_or_safepoint(CodeCache_lock);
606
607 init_defaults();
608 _entry_bci = InvocationEntryBci;
609 // We have no exception handler or deopt handler make the
610 // values something that will never match a pc like the nmethod vtable entry
611 _exception_offset = 0;
612 _orig_pc_offset = 0;
613
614 _consts_offset = data_offset();
615 _stub_offset = data_offset();
616 _oops_offset = data_offset();
617 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize);
618 scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize);
619 _scopes_pcs_offset = scopes_data_offset;
620 _dependencies_offset = _scopes_pcs_offset;
621 _handler_table_offset = _dependencies_offset;
622 _nul_chk_table_offset = _handler_table_offset;
623 #if INCLUDE_JVMCI
624 _speculations_offset = _nul_chk_table_offset;
625 _jvmci_data_offset = _speculations_offset;
626 _nmethod_end_offset = _jvmci_data_offset;
627 #else
628 _nmethod_end_offset = _nul_chk_table_offset;
629 #endif
630 _compile_id = compile_id;
631 _comp_level = CompLevel_none;
632 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
633 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
634 _osr_entry_point = NULL;
635 _exception_cache = NULL;
636 _pc_desc_container.reset_to(NULL);
637 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
638
639 _scopes_data_begin = (address) this + scopes_data_offset;
640 _deopt_handler_begin = (address) this + deoptimize_offset;
641 _deopt_mh_handler_begin = (address) this + deoptimize_mh_offset;
642
643 code_buffer->copy_code_and_locs_to(this);
644 code_buffer->copy_values_to(this);
645
646 clear_unloading_state();
647
648 Universe::heap()->register_nmethod(this);
649 debug_only(Universe::heap()->verify_nmethod(this));
650
651 CodeCache::commit(this);
652 }
653
654 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
655 ttyLocker ttyl; // keep the following output all in one block
656 // This output goes directly to the tty, not the compiler log.
657 // To enable tools to match it up with the compilation activity,
658 // be sure to tag this tty output with the compile ID.
659 if (xtty != NULL) {
660 xtty->begin_head("print_native_nmethod");
661 xtty->method(_method);
662 xtty->stamp();
663 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
664 }
665 // Print the header part, then print the requested information.
666 // This is both handled in decode2(), called via print_code() -> decode()
667 if (PrintNativeNMethods) {
668 tty->print_cr("-------------------------- Assembly (native nmethod) ---------------------------");
669 print_code();
670 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
671 #if defined(SUPPORT_DATA_STRUCTS)
672 if (AbstractDisassembler::show_structs()) {
673 if (oop_maps != NULL) {
674 tty->print("oop maps:"); // oop_maps->print_on(tty) outputs a cr() at the beginning
675 oop_maps->print_on(tty);
676 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
677 }
678 }
679 #endif
680 } else {
681 print(); // print the header part only.
682 }
683 #if defined(SUPPORT_DATA_STRUCTS)
684 if (AbstractDisassembler::show_structs()) {
685 if (PrintRelocations) {
686 print_relocations();
687 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
688 }
689 }
690 #endif
691 if (xtty != NULL) {
692 xtty->tail("print_native_nmethod");
693 }
694 }
695 }
696
697 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () {
698 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level));
699 }
700
701 nmethod::nmethod(
702 Method* method,
703 CompilerType type,
704 int nmethod_size,
705 int compile_id,
706 int entry_bci,
707 CodeOffsets* offsets,
708 int orig_pc_offset,
709 DebugInformationRecorder* debug_info,
710 Dependencies* dependencies,
711 CodeBuffer *code_buffer,
712 int frame_size,
713 OopMapSet* oop_maps,
714 ExceptionHandlerTable* handler_table,
715 ImplicitExceptionTable* nul_chk_table,
716 AbstractCompiler* compiler,
717 int comp_level
718 #if INCLUDE_JVMCI
719 , char* speculations,
720 int speculations_len,
721 int jvmci_data_size
722 #endif
723 )
724 : CompiledMethod(method, "nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false),
725 _is_unloading_state(0),
726 _native_receiver_sp_offset(in_ByteSize(-1)),
727 _native_basic_lock_sp_offset(in_ByteSize(-1))
728 {
729 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
730 {
731 debug_only(NoSafepointVerifier nsv;)
732 assert_locked_or_safepoint(CodeCache_lock);
733
734 _deopt_handler_begin = (address) this;
735 _deopt_mh_handler_begin = (address) this;
736
737 init_defaults();
738 _entry_bci = entry_bci;
739 _compile_id = compile_id;
740 _comp_level = comp_level;
741 _orig_pc_offset = orig_pc_offset;
742 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
743
744 // Section offsets
745 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts());
746 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs());
747 set_ctable_begin(header_begin() + _consts_offset);
748
749 #if INCLUDE_JVMCI
750 if (compiler->is_jvmci()) {
751 // JVMCI might not produce any stub sections
752 if (offsets->value(CodeOffsets::Exceptions) != -1) {
753 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions);
754 } else {
755 _exception_offset = -1;
756 }
757 if (offsets->value(CodeOffsets::Deopt) != -1) {
758 _deopt_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::Deopt);
759 } else {
760 _deopt_handler_begin = NULL;
761 }
762 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
763 _deopt_mh_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::DeoptMH);
764 } else {
765 _deopt_mh_handler_begin = NULL;
766 }
767 } else
768 #endif
769 {
770 // Exception handler and deopt handler are in the stub section
771 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set");
772 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set");
773
774 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
775 _deopt_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::Deopt);
776 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
777 _deopt_mh_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::DeoptMH);
778 } else {
779 _deopt_mh_handler_begin = NULL;
780 }
781 }
782 if (offsets->value(CodeOffsets::UnwindHandler) != -1) {
783 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler);
784 } else {
785 _unwind_handler_offset = -1;
786 }
787
788 _oops_offset = data_offset();
789 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize);
790 int scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize);
791
792 _scopes_pcs_offset = scopes_data_offset + align_up(debug_info->data_size (), oopSize);
793 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
794 _handler_table_offset = _dependencies_offset + align_up((int)dependencies->size_in_bytes (), oopSize);
795 _nul_chk_table_offset = _handler_table_offset + align_up(handler_table->size_in_bytes(), oopSize);
796 #if INCLUDE_JVMCI
797 _speculations_offset = _nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize);
798 _jvmci_data_offset = _speculations_offset + align_up(speculations_len, oopSize);
799 _nmethod_end_offset = _jvmci_data_offset + align_up(jvmci_data_size, oopSize);
800 #else
801 _nmethod_end_offset = _nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize);
802 #endif
803 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
804 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
805 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry);
806 _exception_cache = NULL;
807 _scopes_data_begin = (address) this + scopes_data_offset;
808
809 _pc_desc_container.reset_to(scopes_pcs_begin());
810
811 code_buffer->copy_code_and_locs_to(this);
812 // Copy contents of ScopeDescRecorder to nmethod
813 code_buffer->copy_values_to(this);
814 debug_info->copy_to(this);
815 dependencies->copy_to(this);
816 clear_unloading_state();
817
818 Universe::heap()->register_nmethod(this);
819 debug_only(Universe::heap()->verify_nmethod(this));
820
821 CodeCache::commit(this);
822
823 // Copy contents of ExceptionHandlerTable to nmethod
824 handler_table->copy_to(this);
825 nul_chk_table->copy_to(this);
826
827 #if INCLUDE_JVMCI
828 // Copy speculations to nmethod
829 if (speculations_size() != 0) {
830 memcpy(speculations_begin(), speculations, speculations_len);
831 }
832 #endif
833
834 // we use the information of entry points to find out if a method is
835 // static or non static
836 assert(compiler->is_c2() || compiler->is_jvmci() ||
837 _method->is_static() == (entry_point() == _verified_entry_point),
838 " entry points must be same for static methods and vice versa");
839 }
840 }
841
842 // Print a short set of xml attributes to identify this nmethod. The
843 // output should be embedded in some other element.
844 void nmethod::log_identity(xmlStream* log) const {
845 log->print(" compile_id='%d'", compile_id());
846 const char* nm_kind = compile_kind();
847 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind);
848 log->print(" compiler='%s'", compiler_name());
849 if (TieredCompilation) {
850 log->print(" level='%d'", comp_level());
851 }
852 #if INCLUDE_JVMCI
853 if (jvmci_nmethod_data() != NULL) {
854 const char* jvmci_name = jvmci_nmethod_data()->name();
855 if (jvmci_name != NULL) {
856 log->print(" jvmci_mirror_name='");
857 log->text("%s", jvmci_name);
858 log->print("'");
859 }
860 }
861 #endif
862 }
863
864
865 #define LOG_OFFSET(log, name) \
866 if (p2i(name##_end()) - p2i(name##_begin())) \
867 log->print(" " XSTR(name) "_offset='" INTX_FORMAT "'" , \
868 p2i(name##_begin()) - p2i(this))
869
870
871 void nmethod::log_new_nmethod() const {
872 if (LogCompilation && xtty != NULL) {
873 ttyLocker ttyl;
874 HandleMark hm;
875 xtty->begin_elem("nmethod");
876 log_identity(xtty);
877 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size());
878 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this));
879
880 LOG_OFFSET(xtty, relocation);
881 LOG_OFFSET(xtty, consts);
882 LOG_OFFSET(xtty, insts);
883 LOG_OFFSET(xtty, stub);
884 LOG_OFFSET(xtty, scopes_data);
885 LOG_OFFSET(xtty, scopes_pcs);
886 LOG_OFFSET(xtty, dependencies);
887 LOG_OFFSET(xtty, handler_table);
888 LOG_OFFSET(xtty, nul_chk_table);
889 LOG_OFFSET(xtty, oops);
890 LOG_OFFSET(xtty, metadata);
891
892 xtty->method(method());
893 xtty->stamp();
894 xtty->end_elem();
895 }
896 }
897
898 #undef LOG_OFFSET
899
900
901 // Print out more verbose output usually for a newly created nmethod.
902 void nmethod::print_on(outputStream* st, const char* msg) const {
903 if (st != NULL) {
904 ttyLocker ttyl;
905 if (WizardMode) {
906 CompileTask::print(st, this, msg, /*short_form:*/ true);
907 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this));
908 } else {
909 CompileTask::print(st, this, msg, /*short_form:*/ false);
910 }
911 }
912 }
913
914 void nmethod::maybe_print_nmethod(DirectiveSet* directive) {
915 bool printnmethods = directive->PrintAssemblyOption || directive->PrintNMethodsOption;
916 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
917 print_nmethod(printnmethods);
918 }
919 }
920
921 void nmethod::print_nmethod(bool printmethod) {
922 ttyLocker ttyl; // keep the following output all in one block
923 if (xtty != NULL) {
924 xtty->begin_head("print_nmethod");
925 log_identity(xtty);
926 xtty->stamp();
927 xtty->end_head();
928 }
929 // Print the header part, then print the requested information.
930 // This is both handled in decode2().
931 if (printmethod) {
932 HandleMark hm;
933 ResourceMark m;
934 if (is_compiled_by_c1()) {
935 tty->cr();
936 tty->print_cr("============================= C1-compiled nmethod ==============================");
937 }
938 if (is_compiled_by_jvmci()) {
939 tty->cr();
940 tty->print_cr("=========================== JVMCI-compiled nmethod =============================");
941 }
942 tty->print_cr("----------------------------------- Assembly -----------------------------------");
943 decode2(tty);
944 #if defined(SUPPORT_DATA_STRUCTS)
945 if (AbstractDisassembler::show_structs()) {
946 // Print the oops from the underlying CodeBlob as well.
947 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
948 print_oops(tty);
949 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
950 print_metadata(tty);
951 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
952 print_pcs();
953 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
954 if (oop_maps() != NULL) {
955 tty->print("oop maps:"); // oop_maps()->print_on(tty) outputs a cr() at the beginning
956 oop_maps()->print_on(tty);
957 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
958 }
959 }
960 #endif
961 } else {
962 print(); // print the header part only.
963 }
964
965 #if defined(SUPPORT_DATA_STRUCTS)
966 if (AbstractDisassembler::show_structs()) {
967 if (printmethod || PrintDebugInfo || CompilerOracle::has_option_string(_method, "PrintDebugInfo")) {
968 print_scopes();
969 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
970 }
971 if (printmethod || PrintRelocations || CompilerOracle::has_option_string(_method, "PrintRelocations")) {
972 print_relocations();
973 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
974 }
975 if (printmethod || PrintDependencies || CompilerOracle::has_option_string(_method, "PrintDependencies")) {
976 print_dependencies();
977 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
978 }
979 if (printmethod || PrintExceptionHandlers) {
980 print_handler_table();
981 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
982 print_nul_chk_table();
983 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
984 }
985
986 if (printmethod) {
987 print_recorded_oops();
988 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
989 print_recorded_metadata();
990 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
991 }
992 }
993 #endif
994
995 if (xtty != NULL) {
996 xtty->tail("print_nmethod");
997 }
998 }
999
1000
1001 // Promote one word from an assembly-time handle to a live embedded oop.
1002 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
1003 if (handle == NULL ||
1004 // As a special case, IC oops are initialized to 1 or -1.
1005 handle == (jobject) Universe::non_oop_word()) {
1006 (*dest) = (oop) handle;
1007 } else {
1008 (*dest) = JNIHandles::resolve_non_null(handle);
1009 }
1010 }
1011
1012
1013 // Have to have the same name because it's called by a template
1014 void nmethod::copy_values(GrowableArray<jobject>* array) {
1015 int length = array->length();
1016 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
1017 oop* dest = oops_begin();
1018 for (int index = 0 ; index < length; index++) {
1019 initialize_immediate_oop(&dest[index], array->at(index));
1020 }
1021
1022 // Now we can fix up all the oops in the code. We need to do this
1023 // in the code because the assembler uses jobjects as placeholders.
1024 // The code and relocations have already been initialized by the
1025 // CodeBlob constructor, so it is valid even at this early point to
1026 // iterate over relocations and patch the code.
1027 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true);
1028 }
1029
1030 void nmethod::copy_values(GrowableArray<Metadata*>* array) {
1031 int length = array->length();
1032 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough");
1033 Metadata** dest = metadata_begin();
1034 for (int index = 0 ; index < length; index++) {
1035 dest[index] = array->at(index);
1036 }
1037 }
1038
1039 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) {
1040 // re-patch all oop-bearing instructions, just in case some oops moved
1041 RelocIterator iter(this, begin, end);
1042 while (iter.next()) {
1043 if (iter.type() == relocInfo::oop_type) {
1044 oop_Relocation* reloc = iter.oop_reloc();
1045 if (initialize_immediates && reloc->oop_is_immediate()) {
1046 oop* dest = reloc->oop_addr();
1047 initialize_immediate_oop(dest, (jobject) *dest);
1048 }
1049 // Refresh the oop-related bits of this instruction.
1050 reloc->fix_oop_relocation();
1051 } else if (iter.type() == relocInfo::metadata_type) {
1052 metadata_Relocation* reloc = iter.metadata_reloc();
1053 reloc->fix_metadata_relocation();
1054 }
1055 }
1056 }
1057
1058
1059 void nmethod::verify_clean_inline_caches() {
1060 assert(CompiledICLocker::is_safe(this), "mt unsafe call");
1061
1062 ResourceMark rm;
1063 RelocIterator iter(this, oops_reloc_begin());
1064 while(iter.next()) {
1065 switch(iter.type()) {
1066 case relocInfo::virtual_call_type:
1067 case relocInfo::opt_virtual_call_type: {
1068 CompiledIC *ic = CompiledIC_at(&iter);
1069 // Ok, to lookup references to zombies here
1070 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
1071 assert(cb != NULL, "destination not in CodeBlob?");
1072 nmethod* nm = cb->as_nmethod_or_null();
1073 if( nm != NULL ) {
1074 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
1075 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1076 assert(ic->is_clean(), "IC should be clean");
1077 }
1078 }
1079 break;
1080 }
1081 case relocInfo::static_call_type: {
1082 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
1083 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
1084 assert(cb != NULL, "destination not in CodeBlob?");
1085 nmethod* nm = cb->as_nmethod_or_null();
1086 if( nm != NULL ) {
1087 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
1088 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1089 assert(csc->is_clean(), "IC should be clean");
1090 }
1091 }
1092 break;
1093 }
1094 default:
1095 break;
1096 }
1097 }
1098 }
1099
1100 // This is a private interface with the sweeper.
1101 void nmethod::mark_as_seen_on_stack() {
1102 assert(is_alive(), "Must be an alive method");
1103 // Set the traversal mark to ensure that the sweeper does 2
1104 // cleaning passes before moving to zombie.
1105 set_stack_traversal_mark(NMethodSweeper::traversal_count());
1106 }
1107
1108 // Tell if a non-entrant method can be converted to a zombie (i.e.,
1109 // there are no activations on the stack, not in use by the VM,
1110 // and not in use by the ServiceThread)
1111 bool nmethod::can_convert_to_zombie() {
1112 // Note that this is called when the sweeper has observed the nmethod to be
1113 // not_entrant. However, with concurrent code cache unloading, the state
1114 // might have moved on to unloaded if it is_unloading(), due to racing
1115 // concurrent GC threads.
1116 assert(is_not_entrant() || is_unloading(), "must be a non-entrant method");
1117
1118 // Since the nmethod sweeper only does partial sweep the sweeper's traversal
1119 // count can be greater than the stack traversal count before it hits the
1120 // nmethod for the second time.
1121 // If an is_unloading() nmethod is still not_entrant, then it is not safe to
1122 // convert it to zombie due to GC unloading interactions. However, if it
1123 // has become unloaded, then it is okay to convert such nmethods to zombie.
1124 return stack_traversal_mark() + 1 < NMethodSweeper::traversal_count() &&
1125 !is_locked_by_vm() && (!is_unloading() || is_unloaded());
1126 }
1127
1128 void nmethod::inc_decompile_count() {
1129 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return;
1130 // Could be gated by ProfileTraps, but do not bother...
1131 Method* m = method();
1132 if (m == NULL) return;
1133 MethodData* mdo = m->method_data();
1134 if (mdo == NULL) return;
1135 // There is a benign race here. See comments in methodData.hpp.
1136 mdo->inc_decompile_count();
1137 }
1138
1139 bool nmethod::try_transition(int new_state_int) {
1140 signed char new_state = new_state_int;
1141 for (;;) {
1142 signed char old_state = Atomic::load(&_state);
1143 if (old_state >= new_state) {
1144 // Ensure monotonicity of transitions.
1145 return false;
1146 }
1147 if (Atomic::cmpxchg(new_state, &_state, old_state) == old_state) {
1148 return true;
1149 }
1150 }
1151 }
1152
1153 void nmethod::make_unloaded() {
1154 post_compiled_method_unload();
1155
1156 // This nmethod is being unloaded, make sure that dependencies
1157 // recorded in instanceKlasses get flushed.
1158 // Since this work is being done during a GC, defer deleting dependencies from the
1159 // InstanceKlass.
1160 assert(Universe::heap()->is_gc_active() || Thread::current()->is_ConcurrentGC_thread(),
1161 "should only be called during gc");
1162 flush_dependencies(/*delete_immediately*/false);
1163
1164 // Break cycle between nmethod & method
1165 LogTarget(Trace, class, unload, nmethod) lt;
1166 if (lt.is_enabled()) {
1167 LogStream ls(lt);
1168 ls.print("making nmethod " INTPTR_FORMAT
1169 " unloadable, Method*(" INTPTR_FORMAT
1170 ") ",
1171 p2i(this), p2i(_method));
1172 ls.cr();
1173 }
1174 // Unlink the osr method, so we do not look this up again
1175 if (is_osr_method()) {
1176 // Invalidate the osr nmethod only once. Note that with concurrent
1177 // code cache unloading, OSR nmethods are invalidated before they
1178 // are made unloaded. Therefore, this becomes a no-op then.
1179 if (is_in_use()) {
1180 invalidate_osr_method();
1181 }
1182 #ifdef ASSERT
1183 if (method() != NULL) {
1184 // Make sure osr nmethod is invalidated, i.e. not on the list
1185 bool found = method()->method_holder()->remove_osr_nmethod(this);
1186 assert(!found, "osr nmethod should have been invalidated");
1187 }
1188 #endif
1189 }
1190
1191 // If _method is already NULL the Method* is about to be unloaded,
1192 // so we don't have to break the cycle. Note that it is possible to
1193 // have the Method* live here, in case we unload the nmethod because
1194 // it is pointing to some oop (other than the Method*) being unloaded.
1195 if (_method != NULL) {
1196 // OSR methods point to the Method*, but the Method* does not
1197 // point back!
1198 if (_method->code() == this) {
1199 _method->clear_code(); // Break a cycle
1200 }
1201 }
1202
1203 // Make the class unloaded - i.e., change state and notify sweeper
1204 assert(SafepointSynchronize::is_at_safepoint() || Thread::current()->is_ConcurrentGC_thread(),
1205 "must be at safepoint");
1206
1207 {
1208 // Clear ICStubs and release any CompiledICHolders.
1209 CompiledICLocker ml(this);
1210 clear_ic_callsites();
1211 }
1212
1213 // Unregister must be done before the state change
1214 {
1215 MutexLocker ml(SafepointSynchronize::is_at_safepoint() ? NULL : CodeCache_lock,
1216 Mutex::_no_safepoint_check_flag);
1217 Universe::heap()->unregister_nmethod(this);
1218 }
1219
1220 // Clear the method of this dead nmethod
1221 set_method(NULL);
1222
1223 // Log the unloading.
1224 log_state_change();
1225
1226 // The Method* is gone at this point
1227 assert(_method == NULL, "Tautology");
1228
1229 set_osr_link(NULL);
1230 NMethodSweeper::report_state_change(this);
1231
1232 bool transition_success = try_transition(unloaded);
1233
1234 // It is an important invariant that there exists no race between
1235 // the sweeper and GC thread competing for making the same nmethod
1236 // zombie and unloaded respectively. This is ensured by
1237 // can_convert_to_zombie() returning false for any is_unloading()
1238 // nmethod, informing the sweeper not to step on any GC toes.
1239 assert(transition_success, "Invalid nmethod transition to unloaded");
1240
1241 #if INCLUDE_JVMCI
1242 // Clear the link between this nmethod and a HotSpotNmethod mirror
1243 JVMCINMethodData* nmethod_data = jvmci_nmethod_data();
1244 if (nmethod_data != NULL) {
1245 nmethod_data->invalidate_nmethod_mirror(this);
1246 nmethod_data->clear_nmethod_mirror(this);
1247 }
1248 #endif
1249 }
1250
1251 void nmethod::invalidate_osr_method() {
1252 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
1253 // Remove from list of active nmethods
1254 if (method() != NULL) {
1255 method()->method_holder()->remove_osr_nmethod(this);
1256 }
1257 }
1258
1259 void nmethod::log_state_change() const {
1260 if (LogCompilation) {
1261 if (xtty != NULL) {
1262 ttyLocker ttyl; // keep the following output all in one block
1263 if (_state == unloaded) {
1264 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'",
1265 os::current_thread_id());
1266 } else {
1267 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s",
1268 os::current_thread_id(),
1269 (_state == zombie ? " zombie='1'" : ""));
1270 }
1271 log_identity(xtty);
1272 xtty->stamp();
1273 xtty->end_elem();
1274 }
1275 }
1276
1277 const char *state_msg = _state == zombie ? "made zombie" : "made not entrant";
1278 CompileTask::print_ul(this, state_msg);
1279 if (PrintCompilation && _state != unloaded) {
1280 print_on(tty, state_msg);
1281 }
1282 }
1283
1284 void nmethod::unlink_from_method(bool acquire_lock) {
1285 // We need to check if both the _code and _from_compiled_code_entry_point
1286 // refer to this nmethod because there is a race in setting these two fields
1287 // in Method* as seen in bugid 4947125.
1288 // If the vep() points to the zombie nmethod, the memory for the nmethod
1289 // could be flushed and the compiler and vtable stubs could still call
1290 // through it.
1291 if (method() != NULL && (method()->code() == this ||
1292 method()->from_compiled_entry() == verified_entry_point())) {
1293 method()->clear_code(acquire_lock);
1294 }
1295 }
1296
1297 /**
1298 * Common functionality for both make_not_entrant and make_zombie
1299 */
1300 bool nmethod::make_not_entrant_or_zombie(int state) {
1301 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant");
1302 assert(!is_zombie(), "should not already be a zombie");
1303
1304 if (Atomic::load(&_state) >= state) {
1305 // Avoid taking the lock if already in required state.
1306 // This is safe from races because the state is an end-state,
1307 // which the nmethod cannot back out of once entered.
1308 // No need for fencing either.
1309 return false;
1310 }
1311
1312 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below.
1313 nmethodLocker nml(this);
1314 methodHandle the_method(method());
1315 // This can be called while the system is already at a safepoint which is ok
1316 NoSafepointVerifier nsv;
1317
1318 // during patching, depending on the nmethod state we must notify the GC that
1319 // code has been unloaded, unregistering it. We cannot do this right while
1320 // holding the Patching_lock because we need to use the CodeCache_lock. This
1321 // would be prone to deadlocks.
1322 // This flag is used to remember whether we need to later lock and unregister.
1323 bool nmethod_needs_unregister = false;
1324
1325 {
1326 // invalidate osr nmethod before acquiring the patching lock since
1327 // they both acquire leaf locks and we don't want a deadlock.
1328 // This logic is equivalent to the logic below for patching the
1329 // verified entry point of regular methods. We check that the
1330 // nmethod is in use to ensure that it is invalidated only once.
1331 if (is_osr_method() && is_in_use()) {
1332 // this effectively makes the osr nmethod not entrant
1333 invalidate_osr_method();
1334 }
1335
1336 // Enter critical section. Does not block for safepoint.
1337 MutexLocker pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1338
1339 if (Atomic::load(&_state) >= state) {
1340 // another thread already performed this transition so nothing
1341 // to do, but return false to indicate this.
1342 return false;
1343 }
1344
1345 // The caller can be calling the method statically or through an inline
1346 // cache call.
1347 if (!is_osr_method() && !is_not_entrant()) {
1348 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
1349 SharedRuntime::get_handle_wrong_method_stub());
1350 }
1351
1352 if (is_in_use() && update_recompile_counts()) {
1353 // It's a true state change, so mark the method as decompiled.
1354 // Do it only for transition from alive.
1355 inc_decompile_count();
1356 }
1357
1358 // If the state is becoming a zombie, signal to unregister the nmethod with
1359 // the heap.
1360 // This nmethod may have already been unloaded during a full GC.
1361 if ((state == zombie) && !is_unloaded()) {
1362 nmethod_needs_unregister = true;
1363 }
1364
1365 // Must happen before state change. Otherwise we have a race condition in
1366 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately
1367 // transition its state from 'not_entrant' to 'zombie' without having to wait
1368 // for stack scanning.
1369 if (state == not_entrant) {
1370 mark_as_seen_on_stack();
1371 OrderAccess::storestore(); // _stack_traversal_mark and _state
1372 }
1373
1374 // Change state
1375 if (!try_transition(state)) {
1376 // If the transition fails, it is due to another thread making the nmethod more
1377 // dead. In particular, one thread might be making the nmethod unloaded concurrently.
1378 // If so, having patched in the jump in the verified entry unnecessarily is fine.
1379 // The nmethod is no longer possible to call by Java threads.
1380 // Incrementing the decompile count is also fine as the caller of make_not_entrant()
1381 // had a valid reason to deoptimize the nmethod.
1382 // Marking the nmethod as seen on stack also has no effect, as the nmethod is now
1383 // !is_alive(), and the seen on stack value is only used to convert not_entrant
1384 // nmethods to zombie in can_convert_to_zombie().
1385 return false;
1386 }
1387
1388 // Log the transition once
1389 log_state_change();
1390
1391 // Remove nmethod from method.
1392 unlink_from_method(false /* already owns Patching_lock */);
1393 } // leave critical region under Patching_lock
1394
1395 #if INCLUDE_JVMCI
1396 // Invalidate can't occur while holding the Patching lock
1397 JVMCINMethodData* nmethod_data = jvmci_nmethod_data();
1398 if (nmethod_data != NULL) {
1399 nmethod_data->invalidate_nmethod_mirror(this);
1400 }
1401 #endif
1402
1403 #ifdef ASSERT
1404 if (is_osr_method() && method() != NULL) {
1405 // Make sure osr nmethod is invalidated, i.e. not on the list
1406 bool found = method()->method_holder()->remove_osr_nmethod(this);
1407 assert(!found, "osr nmethod should have been invalidated");
1408 }
1409 #endif
1410
1411 // When the nmethod becomes zombie it is no longer alive so the
1412 // dependencies must be flushed. nmethods in the not_entrant
1413 // state will be flushed later when the transition to zombie
1414 // happens or they get unloaded.
1415 if (state == zombie) {
1416 {
1417 // Flushing dependencies must be done before any possible
1418 // safepoint can sneak in, otherwise the oops used by the
1419 // dependency logic could have become stale.
1420 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1421 if (nmethod_needs_unregister) {
1422 Universe::heap()->unregister_nmethod(this);
1423 }
1424 flush_dependencies(/*delete_immediately*/true);
1425 }
1426
1427 #if INCLUDE_JVMCI
1428 // Now that the nmethod has been unregistered, it's
1429 // safe to clear the HotSpotNmethod mirror oop.
1430 if (nmethod_data != NULL) {
1431 nmethod_data->clear_nmethod_mirror(this);
1432 }
1433 #endif
1434
1435 // Clear ICStubs to prevent back patching stubs of zombie or flushed
1436 // nmethods during the next safepoint (see ICStub::finalize), as well
1437 // as to free up CompiledICHolder resources.
1438 {
1439 CompiledICLocker ml(this);
1440 clear_ic_callsites();
1441 }
1442
1443 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload
1444 // event and it hasn't already been reported for this nmethod then
1445 // report it now. The event may have been reported earlier if the GC
1446 // marked it for unloading). JvmtiDeferredEventQueue support means
1447 // we no longer go to a safepoint here.
1448 post_compiled_method_unload();
1449
1450 #ifdef ASSERT
1451 // It's no longer safe to access the oops section since zombie
1452 // nmethods aren't scanned for GC.
1453 _oops_are_stale = true;
1454 #endif
1455 // the Method may be reclaimed by class unloading now that the
1456 // nmethod is in zombie state
1457 set_method(NULL);
1458 } else {
1459 assert(state == not_entrant, "other cases may need to be handled differently");
1460 }
1461
1462 if (TraceCreateZombies && state == zombie) {
1463 ResourceMark m;
1464 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");
1465 }
1466
1467 NMethodSweeper::report_state_change(this);
1468 return true;
1469 }
1470
1471 void nmethod::flush() {
1472 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1473 // Note that there are no valid oops in the nmethod anymore.
1474 assert(!is_osr_method() || is_unloaded() || is_zombie(),
1475 "osr nmethod must be unloaded or zombie before flushing");
1476 assert(is_zombie() || is_osr_method(), "must be a zombie method");
1477 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed");
1478 assert_locked_or_safepoint(CodeCache_lock);
1479
1480 // completely deallocate this method
1481 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, p2i(this));
1482 if (PrintMethodFlushing) {
1483 tty->print_cr("*flushing %s nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT
1484 "/Free CodeCache:" SIZE_FORMAT "Kb",
1485 is_osr_method() ? "osr" : "",_compile_id, p2i(this), CodeCache::blob_count(),
1486 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024);
1487 }
1488
1489 // We need to deallocate any ExceptionCache data.
1490 // Note that we do not need to grab the nmethod lock for this, it
1491 // better be thread safe if we're disposing of it!
1492 ExceptionCache* ec = exception_cache();
1493 set_exception_cache(NULL);
1494 while(ec != NULL) {
1495 ExceptionCache* next = ec->next();
1496 delete ec;
1497 ec = next;
1498 }
1499
1500 Universe::heap()->flush_nmethod(this);
1501 CodeCache::unregister_old_nmethod(this);
1502
1503 CodeBlob::flush();
1504 CodeCache::free(this);
1505 }
1506
1507 oop nmethod::oop_at(int index) const {
1508 if (index == 0) {
1509 return NULL;
1510 }
1511 return NativeAccess<AS_NO_KEEPALIVE>::oop_load(oop_addr_at(index));
1512 }
1513
1514 oop nmethod::oop_at_phantom(int index) const {
1515 if (index == 0) {
1516 return NULL;
1517 }
1518 return NativeAccess<ON_PHANTOM_OOP_REF>::oop_load(oop_addr_at(index));
1519 }
1520
1521 //
1522 // Notify all classes this nmethod is dependent on that it is no
1523 // longer dependent. This should only be called in two situations.
1524 // First, when a nmethod transitions to a zombie all dependents need
1525 // to be clear. Since zombification happens at a safepoint there's no
1526 // synchronization issues. The second place is a little more tricky.
1527 // During phase 1 of mark sweep class unloading may happen and as a
1528 // result some nmethods may get unloaded. In this case the flushing
1529 // of dependencies must happen during phase 1 since after GC any
1530 // dependencies in the unloaded nmethod won't be updated, so
1531 // traversing the dependency information in unsafe. In that case this
1532 // function is called with a boolean argument and this function only
1533 // notifies instanceKlasses that are reachable
1534
1535 void nmethod::flush_dependencies(bool delete_immediately) {
1536 DEBUG_ONLY(bool called_by_gc = Universe::heap()->is_gc_active() || Thread::current()->is_ConcurrentGC_thread();)
1537 assert(called_by_gc != delete_immediately,
1538 "delete_immediately is false if and only if we are called during GC");
1539 if (!has_flushed_dependencies()) {
1540 set_has_flushed_dependencies();
1541 for (Dependencies::DepStream deps(this); deps.next(); ) {
1542 if (deps.type() == Dependencies::call_site_target_value) {
1543 // CallSite dependencies are managed on per-CallSite instance basis.
1544 oop call_site = deps.argument_oop(0);
1545 if (delete_immediately) {
1546 assert_locked_or_safepoint(CodeCache_lock);
1547 MethodHandles::remove_dependent_nmethod(call_site, this);
1548 } else {
1549 MethodHandles::clean_dependency_context(call_site);
1550 }
1551 } else {
1552 Klass* klass = deps.context_type();
1553 if (klass == NULL) {
1554 continue; // ignore things like evol_method
1555 }
1556 // During GC delete_immediately is false, and liveness
1557 // of dependee determines class that needs to be updated.
1558 if (delete_immediately) {
1559 assert_locked_or_safepoint(CodeCache_lock);
1560 InstanceKlass::cast(klass)->remove_dependent_nmethod(this);
1561 } else if (klass->is_loader_alive()) {
1562 // The GC may clean dependency contexts concurrently and in parallel.
1563 InstanceKlass::cast(klass)->clean_dependency_context();
1564 }
1565 }
1566 }
1567 }
1568 }
1569
1570 // ------------------------------------------------------------------
1571 // post_compiled_method_load_event
1572 // new method for install_code() path
1573 // Transfer information from compilation to jvmti
1574 void nmethod::post_compiled_method_load_event() {
1575
1576 Method* moop = method();
1577 HOTSPOT_COMPILED_METHOD_LOAD(
1578 (char *) moop->klass_name()->bytes(),
1579 moop->klass_name()->utf8_length(),
1580 (char *) moop->name()->bytes(),
1581 moop->name()->utf8_length(),
1582 (char *) moop->signature()->bytes(),
1583 moop->signature()->utf8_length(),
1584 insts_begin(), insts_size());
1585
1586 if (JvmtiExport::should_post_compiled_method_load() ||
1587 JvmtiExport::should_post_compiled_method_unload()) {
1588 get_and_cache_jmethod_id();
1589 }
1590
1591 if (JvmtiExport::should_post_compiled_method_load()) {
1592 // Let the Service thread (which is a real Java thread) post the event
1593 MutexLocker ml(Service_lock, Mutex::_no_safepoint_check_flag);
1594 JvmtiDeferredEventQueue::enqueue(
1595 JvmtiDeferredEvent::compiled_method_load_event(this));
1596 }
1597 }
1598
1599 jmethodID nmethod::get_and_cache_jmethod_id() {
1600 if (_jmethod_id == NULL) {
1601 // Cache the jmethod_id since it can no longer be looked up once the
1602 // method itself has been marked for unloading.
1603 _jmethod_id = method()->jmethod_id();
1604 }
1605 return _jmethod_id;
1606 }
1607
1608 void nmethod::post_compiled_method_unload() {
1609 if (unload_reported()) {
1610 // During unloading we transition to unloaded and then to zombie
1611 // and the unloading is reported during the first transition.
1612 return;
1613 }
1614
1615 assert(_method != NULL && !is_unloaded(), "just checking");
1616 DTRACE_METHOD_UNLOAD_PROBE(method());
1617
1618 // If a JVMTI agent has enabled the CompiledMethodUnload event then
1619 // post the event. Sometime later this nmethod will be made a zombie
1620 // by the sweeper but the Method* will not be valid at that point.
1621 // If the _jmethod_id is null then no load event was ever requested
1622 // so don't bother posting the unload. The main reason for this is
1623 // that the jmethodID is a weak reference to the Method* so if
1624 // it's being unloaded there's no way to look it up since the weak
1625 // ref will have been cleared.
1626 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) {
1627 assert(!unload_reported(), "already unloaded");
1628 JvmtiDeferredEvent event =
1629 JvmtiDeferredEvent::compiled_method_unload_event(this,
1630 _jmethod_id, insts_begin());
1631 MutexLocker ml(Service_lock, Mutex::_no_safepoint_check_flag);
1632 JvmtiDeferredEventQueue::enqueue(event);
1633 }
1634
1635 // The JVMTI CompiledMethodUnload event can be enabled or disabled at
1636 // any time. As the nmethod is being unloaded now we mark it has
1637 // having the unload event reported - this will ensure that we don't
1638 // attempt to report the event in the unlikely scenario where the
1639 // event is enabled at the time the nmethod is made a zombie.
1640 set_unload_reported();
1641 }
1642
1643 // Iterate over metadata calling this function. Used by RedefineClasses
1644 void nmethod::metadata_do(MetadataClosure* f) {
1645 {
1646 // Visit all immediate references that are embedded in the instruction stream.
1647 RelocIterator iter(this, oops_reloc_begin());
1648 while (iter.next()) {
1649 if (iter.type() == relocInfo::metadata_type) {
1650 metadata_Relocation* r = iter.metadata_reloc();
1651 // In this metadata, we must only follow those metadatas directly embedded in
1652 // the code. Other metadatas (oop_index>0) are seen as part of
1653 // the metadata section below.
1654 assert(1 == (r->metadata_is_immediate()) +
1655 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
1656 "metadata must be found in exactly one place");
1657 if (r->metadata_is_immediate() && r->metadata_value() != NULL) {
1658 Metadata* md = r->metadata_value();
1659 if (md != _method) f->do_metadata(md);
1660 }
1661 } else if (iter.type() == relocInfo::virtual_call_type) {
1662 // Check compiledIC holders associated with this nmethod
1663 ResourceMark rm;
1664 CompiledIC *ic = CompiledIC_at(&iter);
1665 if (ic->is_icholder_call()) {
1666 CompiledICHolder* cichk = ic->cached_icholder();
1667 f->do_metadata(cichk->holder_metadata());
1668 f->do_metadata(cichk->holder_klass());
1669 } else {
1670 Metadata* ic_oop = ic->cached_metadata();
1671 if (ic_oop != NULL) {
1672 f->do_metadata(ic_oop);
1673 }
1674 }
1675 }
1676 }
1677 }
1678
1679 // Visit the metadata section
1680 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
1681 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops
1682 Metadata* md = *p;
1683 f->do_metadata(md);
1684 }
1685
1686 // Visit metadata not embedded in the other places.
1687 if (_method != NULL) f->do_metadata(_method);
1688 }
1689
1690 // The _is_unloading_state encodes a tuple comprising the unloading cycle
1691 // and the result of IsUnloadingBehaviour::is_unloading() fpr that cycle.
1692 // This is the bit layout of the _is_unloading_state byte: 00000CCU
1693 // CC refers to the cycle, which has 2 bits, and U refers to the result of
1694 // IsUnloadingBehaviour::is_unloading() for that unloading cycle.
1695
1696 class IsUnloadingState: public AllStatic {
1697 static const uint8_t _is_unloading_mask = 1;
1698 static const uint8_t _is_unloading_shift = 0;
1699 static const uint8_t _unloading_cycle_mask = 6;
1700 static const uint8_t _unloading_cycle_shift = 1;
1701
1702 static uint8_t set_is_unloading(uint8_t state, bool value) {
1703 state &= ~_is_unloading_mask;
1704 if (value) {
1705 state |= 1 << _is_unloading_shift;
1706 }
1707 assert(is_unloading(state) == value, "unexpected unloading cycle overflow");
1708 return state;
1709 }
1710
1711 static uint8_t set_unloading_cycle(uint8_t state, uint8_t value) {
1712 state &= ~_unloading_cycle_mask;
1713 state |= value << _unloading_cycle_shift;
1714 assert(unloading_cycle(state) == value, "unexpected unloading cycle overflow");
1715 return state;
1716 }
1717
1718 public:
1719 static bool is_unloading(uint8_t state) { return (state & _is_unloading_mask) >> _is_unloading_shift == 1; }
1720 static uint8_t unloading_cycle(uint8_t state) { return (state & _unloading_cycle_mask) >> _unloading_cycle_shift; }
1721
1722 static uint8_t create(bool is_unloading, uint8_t unloading_cycle) {
1723 uint8_t state = 0;
1724 state = set_is_unloading(state, is_unloading);
1725 state = set_unloading_cycle(state, unloading_cycle);
1726 return state;
1727 }
1728 };
1729
1730 bool nmethod::is_unloading() {
1731 uint8_t state = RawAccess<MO_RELAXED>::load(&_is_unloading_state);
1732 bool state_is_unloading = IsUnloadingState::is_unloading(state);
1733 uint8_t state_unloading_cycle = IsUnloadingState::unloading_cycle(state);
1734 if (state_is_unloading) {
1735 return true;
1736 }
1737 uint8_t current_cycle = CodeCache::unloading_cycle();
1738 if (state_unloading_cycle == current_cycle) {
1739 return false;
1740 }
1741
1742 // The IsUnloadingBehaviour is responsible for checking if there are any dead
1743 // oops in the CompiledMethod, by calling oops_do on it.
1744 state_unloading_cycle = current_cycle;
1745
1746 if (is_zombie()) {
1747 // Zombies without calculated unloading epoch are never unloading due to GC.
1748
1749 // There are no races where a previously observed is_unloading() nmethod
1750 // suddenly becomes not is_unloading() due to here being observed as zombie.
1751
1752 // With STW unloading, all is_alive() && is_unloading() nmethods are unlinked
1753 // and unloaded in the safepoint. That makes races where an nmethod is first
1754 // observed as is_alive() && is_unloading() and subsequently observed as
1755 // is_zombie() impossible.
1756
1757 // With concurrent unloading, all references to is_unloading() nmethods are
1758 // first unlinked (e.g. IC caches and dependency contexts). Then a global
1759 // handshake operation is performed with all JavaThreads before finally
1760 // unloading the nmethods. The sweeper never converts is_alive() && is_unloading()
1761 // nmethods to zombies; it waits for them to become is_unloaded(). So before
1762 // the global handshake, it is impossible for is_unloading() nmethods to
1763 // racingly become is_zombie(). And is_unloading() is calculated for all is_alive()
1764 // nmethods before taking that global handshake, meaning that it will never
1765 // be recalculated after the handshake.
1766
1767 // After that global handshake, is_unloading() nmethods are only observable
1768 // to the iterators, and they will never trigger recomputation of the cached
1769 // is_unloading_state, and hence may not suffer from such races.
1770
1771 state_is_unloading = false;
1772 } else {
1773 state_is_unloading = IsUnloadingBehaviour::current()->is_unloading(this);
1774 }
1775
1776 state = IsUnloadingState::create(state_is_unloading, state_unloading_cycle);
1777
1778 RawAccess<MO_RELAXED>::store(&_is_unloading_state, state);
1779
1780 return state_is_unloading;
1781 }
1782
1783 void nmethod::clear_unloading_state() {
1784 uint8_t state = IsUnloadingState::create(false, CodeCache::unloading_cycle());
1785 RawAccess<MO_RELAXED>::store(&_is_unloading_state, state);
1786 }
1787
1788
1789 // This is called at the end of the strong tracing/marking phase of a
1790 // GC to unload an nmethod if it contains otherwise unreachable
1791 // oops.
1792
1793 void nmethod::do_unloading(bool unloading_occurred) {
1794 // Make sure the oop's ready to receive visitors
1795 assert(!is_zombie() && !is_unloaded(),
1796 "should not call follow on zombie or unloaded nmethod");
1797
1798 if (is_unloading()) {
1799 make_unloaded();
1800 } else {
1801 guarantee(unload_nmethod_caches(unloading_occurred),
1802 "Should not need transition stubs");
1803 }
1804 }
1805
1806 void nmethod::oops_do(OopClosure* f, bool allow_dead) {
1807 // make sure the oops ready to receive visitors
1808 assert(allow_dead || is_alive(), "should not call follow on dead nmethod");
1809
1810 // Prevent extra code cache walk for platforms that don't have immediate oops.
1811 if (relocInfo::mustIterateImmediateOopsInCode()) {
1812 RelocIterator iter(this, oops_reloc_begin());
1813
1814 while (iter.next()) {
1815 if (iter.type() == relocInfo::oop_type ) {
1816 oop_Relocation* r = iter.oop_reloc();
1817 // In this loop, we must only follow those oops directly embedded in
1818 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1819 assert(1 == (r->oop_is_immediate()) +
1820 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1821 "oop must be found in exactly one place");
1822 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1823 f->do_oop(r->oop_addr());
1824 }
1825 }
1826 }
1827 }
1828
1829 // Scopes
1830 // This includes oop constants not inlined in the code stream.
1831 for (oop* p = oops_begin(); p < oops_end(); p++) {
1832 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1833 f->do_oop(p);
1834 }
1835 }
1836
1837 #define NMETHOD_SENTINEL ((nmethod*)badAddress)
1838
1839 nmethod* volatile nmethod::_oops_do_mark_nmethods;
1840
1841 // An nmethod is "marked" if its _mark_link is set non-null.
1842 // Even if it is the end of the linked list, it will have a non-null link value,
1843 // as long as it is on the list.
1844 // This code must be MP safe, because it is used from parallel GC passes.
1845 bool nmethod::test_set_oops_do_mark() {
1846 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");
1847 if (_oops_do_mark_link == NULL) {
1848 // Claim this nmethod for this thread to mark.
1849 if (Atomic::replace_if_null(NMETHOD_SENTINEL, &_oops_do_mark_link)) {
1850 // Atomically append this nmethod (now claimed) to the head of the list:
1851 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods;
1852 for (;;) {
1853 nmethod* required_mark_nmethods = observed_mark_nmethods;
1854 _oops_do_mark_link = required_mark_nmethods;
1855 observed_mark_nmethods =
1856 Atomic::cmpxchg(this, &_oops_do_mark_nmethods, required_mark_nmethods);
1857 if (observed_mark_nmethods == required_mark_nmethods)
1858 break;
1859 }
1860 // Mark was clear when we first saw this guy.
1861 LogTarget(Trace, gc, nmethod) lt;
1862 if (lt.is_enabled()) {
1863 LogStream ls(lt);
1864 CompileTask::print(&ls, this, "oops_do, mark", /*short_form:*/ true);
1865 }
1866 return false;
1867 }
1868 }
1869 // On fall through, another racing thread marked this nmethod before we did.
1870 return true;
1871 }
1872
1873 void nmethod::oops_do_marking_prologue() {
1874 log_trace(gc, nmethod)("oops_do_marking_prologue");
1875 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row");
1876 // We use cmpxchg instead of regular assignment here because the user
1877 // may fork a bunch of threads, and we need them all to see the same state.
1878 nmethod* observed = Atomic::cmpxchg(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, (nmethod*)NULL);
1879 guarantee(observed == NULL, "no races in this sequential code");
1880 }
1881
1882 void nmethod::oops_do_marking_epilogue() {
1883 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row");
1884 nmethod* cur = _oops_do_mark_nmethods;
1885 while (cur != NMETHOD_SENTINEL) {
1886 assert(cur != NULL, "not NULL-terminated");
1887 nmethod* next = cur->_oops_do_mark_link;
1888 cur->_oops_do_mark_link = NULL;
1889 DEBUG_ONLY(cur->verify_oop_relocations());
1890
1891 LogTarget(Trace, gc, nmethod) lt;
1892 if (lt.is_enabled()) {
1893 LogStream ls(lt);
1894 CompileTask::print(&ls, cur, "oops_do, unmark", /*short_form:*/ true);
1895 }
1896 cur = next;
1897 }
1898 nmethod* required = _oops_do_mark_nmethods;
1899 nmethod* observed = Atomic::cmpxchg((nmethod*)NULL, &_oops_do_mark_nmethods, required);
1900 guarantee(observed == required, "no races in this sequential code");
1901 log_trace(gc, nmethod)("oops_do_marking_epilogue");
1902 }
1903
1904 inline bool includes(void* p, void* from, void* to) {
1905 return from <= p && p < to;
1906 }
1907
1908
1909 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
1910 assert(count >= 2, "must be sentinel values, at least");
1911
1912 #ifdef ASSERT
1913 // must be sorted and unique; we do a binary search in find_pc_desc()
1914 int prev_offset = pcs[0].pc_offset();
1915 assert(prev_offset == PcDesc::lower_offset_limit,
1916 "must start with a sentinel");
1917 for (int i = 1; i < count; i++) {
1918 int this_offset = pcs[i].pc_offset();
1919 assert(this_offset > prev_offset, "offsets must be sorted");
1920 prev_offset = this_offset;
1921 }
1922 assert(prev_offset == PcDesc::upper_offset_limit,
1923 "must end with a sentinel");
1924 #endif //ASSERT
1925
1926 // Search for MethodHandle invokes and tag the nmethod.
1927 for (int i = 0; i < count; i++) {
1928 if (pcs[i].is_method_handle_invoke()) {
1929 set_has_method_handle_invokes(true);
1930 break;
1931 }
1932 }
1933 assert(has_method_handle_invokes() == (_deopt_mh_handler_begin != NULL), "must have deopt mh handler");
1934
1935 int size = count * sizeof(PcDesc);
1936 assert(scopes_pcs_size() >= size, "oob");
1937 memcpy(scopes_pcs_begin(), pcs, size);
1938
1939 // Adjust the final sentinel downward.
1940 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
1941 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
1942 last_pc->set_pc_offset(content_size() + 1);
1943 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
1944 // Fill any rounding gaps with copies of the last record.
1945 last_pc[1] = last_pc[0];
1946 }
1947 // The following assert could fail if sizeof(PcDesc) is not
1948 // an integral multiple of oopSize (the rounding term).
1949 // If it fails, change the logic to always allocate a multiple
1950 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
1951 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
1952 }
1953
1954 void nmethod::copy_scopes_data(u_char* buffer, int size) {
1955 assert(scopes_data_size() >= size, "oob");
1956 memcpy(scopes_data_begin(), buffer, size);
1957 }
1958
1959 #ifdef ASSERT
1960 static PcDesc* linear_search(const PcDescSearch& search, int pc_offset, bool approximate) {
1961 PcDesc* lower = search.scopes_pcs_begin();
1962 PcDesc* upper = search.scopes_pcs_end();
1963 lower += 1; // exclude initial sentinel
1964 PcDesc* res = NULL;
1965 for (PcDesc* p = lower; p < upper; p++) {
1966 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc
1967 if (match_desc(p, pc_offset, approximate)) {
1968 if (res == NULL)
1969 res = p;
1970 else
1971 res = (PcDesc*) badAddress;
1972 }
1973 }
1974 return res;
1975 }
1976 #endif
1977
1978
1979 // Finds a PcDesc with real-pc equal to "pc"
1980 PcDesc* PcDescContainer::find_pc_desc_internal(address pc, bool approximate, const PcDescSearch& search) {
1981 address base_address = search.code_begin();
1982 if ((pc < base_address) ||
1983 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
1984 return NULL; // PC is wildly out of range
1985 }
1986 int pc_offset = (int) (pc - base_address);
1987
1988 // Check the PcDesc cache if it contains the desired PcDesc
1989 // (This as an almost 100% hit rate.)
1990 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
1991 if (res != NULL) {
1992 assert(res == linear_search(search, pc_offset, approximate), "cache ok");
1993 return res;
1994 }
1995
1996 // Fallback algorithm: quasi-linear search for the PcDesc
1997 // Find the last pc_offset less than the given offset.
1998 // The successor must be the required match, if there is a match at all.
1999 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
2000 PcDesc* lower = search.scopes_pcs_begin();
2001 PcDesc* upper = search.scopes_pcs_end();
2002 upper -= 1; // exclude final sentinel
2003 if (lower >= upper) return NULL; // native method; no PcDescs at all
2004
2005 #define assert_LU_OK \
2006 /* invariant on lower..upper during the following search: */ \
2007 assert(lower->pc_offset() < pc_offset, "sanity"); \
2008 assert(upper->pc_offset() >= pc_offset, "sanity")
2009 assert_LU_OK;
2010
2011 // Use the last successful return as a split point.
2012 PcDesc* mid = _pc_desc_cache.last_pc_desc();
2013 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
2014 if (mid->pc_offset() < pc_offset) {
2015 lower = mid;
2016 } else {
2017 upper = mid;
2018 }
2019
2020 // Take giant steps at first (4096, then 256, then 16, then 1)
2021 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
2022 const int RADIX = (1 << LOG2_RADIX);
2023 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
2024 while ((mid = lower + step) < upper) {
2025 assert_LU_OK;
2026 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
2027 if (mid->pc_offset() < pc_offset) {
2028 lower = mid;
2029 } else {
2030 upper = mid;
2031 break;
2032 }
2033 }
2034 assert_LU_OK;
2035 }
2036
2037 // Sneak up on the value with a linear search of length ~16.
2038 while (true) {
2039 assert_LU_OK;
2040 mid = lower + 1;
2041 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
2042 if (mid->pc_offset() < pc_offset) {
2043 lower = mid;
2044 } else {
2045 upper = mid;
2046 break;
2047 }
2048 }
2049 #undef assert_LU_OK
2050
2051 if (match_desc(upper, pc_offset, approximate)) {
2052 assert(upper == linear_search(search, pc_offset, approximate), "search ok");
2053 _pc_desc_cache.add_pc_desc(upper);
2054 return upper;
2055 } else {
2056 assert(NULL == linear_search(search, pc_offset, approximate), "search ok");
2057 return NULL;
2058 }
2059 }
2060
2061
2062 void nmethod::check_all_dependencies(DepChange& changes) {
2063 // Checked dependencies are allocated into this ResourceMark
2064 ResourceMark rm;
2065
2066 // Turn off dependency tracing while actually testing dependencies.
2067 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) );
2068
2069 typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash,
2070 &DependencySignature::equals, 11027> DepTable;
2071
2072 DepTable* table = new DepTable();
2073
2074 // Iterate over live nmethods and check dependencies of all nmethods that are not
2075 // marked for deoptimization. A particular dependency is only checked once.
2076 NMethodIterator iter(NMethodIterator::only_alive_and_not_unloading);
2077 while(iter.next()) {
2078 nmethod* nm = iter.method();
2079 // Only notify for live nmethods
2080 if (!nm->is_marked_for_deoptimization()) {
2081 for (Dependencies::DepStream deps(nm); deps.next(); ) {
2082 // Construct abstraction of a dependency.
2083 DependencySignature* current_sig = new DependencySignature(deps);
2084
2085 // Determine if dependency is already checked. table->put(...) returns
2086 // 'true' if the dependency is added (i.e., was not in the hashtable).
2087 if (table->put(*current_sig, 1)) {
2088 if (deps.check_dependency() != NULL) {
2089 // Dependency checking failed. Print out information about the failed
2090 // dependency and finally fail with an assert. We can fail here, since
2091 // dependency checking is never done in a product build.
2092 tty->print_cr("Failed dependency:");
2093 changes.print();
2094 nm->print();
2095 nm->print_dependencies();
2096 assert(false, "Should have been marked for deoptimization");
2097 }
2098 }
2099 }
2100 }
2101 }
2102 }
2103
2104 bool nmethod::check_dependency_on(DepChange& changes) {
2105 // What has happened:
2106 // 1) a new class dependee has been added
2107 // 2) dependee and all its super classes have been marked
2108 bool found_check = false; // set true if we are upset
2109 for (Dependencies::DepStream deps(this); deps.next(); ) {
2110 // Evaluate only relevant dependencies.
2111 if (deps.spot_check_dependency_at(changes) != NULL) {
2112 found_check = true;
2113 NOT_DEBUG(break);
2114 }
2115 }
2116 return found_check;
2117 }
2118
2119 // Called from mark_for_deoptimization, when dependee is invalidated.
2120 bool nmethod::is_dependent_on_method(Method* dependee) {
2121 for (Dependencies::DepStream deps(this); deps.next(); ) {
2122 if (deps.type() != Dependencies::evol_method)
2123 continue;
2124 Method* method = deps.method_argument(0);
2125 if (method == dependee) return true;
2126 }
2127 return false;
2128 }
2129
2130
2131 bool nmethod::is_patchable_at(address instr_addr) {
2132 assert(insts_contains(instr_addr), "wrong nmethod used");
2133 if (is_zombie()) {
2134 // a zombie may never be patched
2135 return false;
2136 }
2137 return true;
2138 }
2139
2140
2141 void nmethod_init() {
2142 // make sure you didn't forget to adjust the filler fields
2143 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
2144 }
2145
2146
2147 //-------------------------------------------------------------------------------------------
2148
2149
2150 // QQQ might we make this work from a frame??
2151 nmethodLocker::nmethodLocker(address pc) {
2152 CodeBlob* cb = CodeCache::find_blob(pc);
2153 guarantee(cb != NULL && cb->is_compiled(), "bad pc for a nmethod found");
2154 _nm = cb->as_compiled_method();
2155 lock_nmethod(_nm);
2156 }
2157
2158 // Only JvmtiDeferredEvent::compiled_method_unload_event()
2159 // should pass zombie_ok == true.
2160 void nmethodLocker::lock_nmethod(CompiledMethod* cm, bool zombie_ok) {
2161 if (cm == NULL) return;
2162 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method
2163 nmethod* nm = cm->as_nmethod();
2164 Atomic::inc(&nm->_lock_count);
2165 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method: %p", nm);
2166 }
2167
2168 void nmethodLocker::unlock_nmethod(CompiledMethod* cm) {
2169 if (cm == NULL) return;
2170 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method
2171 nmethod* nm = cm->as_nmethod();
2172 Atomic::dec(&nm->_lock_count);
2173 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock");
2174 }
2175
2176
2177 // -----------------------------------------------------------------------------
2178 // Verification
2179
2180 class VerifyOopsClosure: public OopClosure {
2181 nmethod* _nm;
2182 bool _ok;
2183 public:
2184 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
2185 bool ok() { return _ok; }
2186 virtual void do_oop(oop* p) {
2187 if (oopDesc::is_oop_or_null(*p)) return;
2188 // Print diagnostic information before calling print_nmethod().
2189 // Assertions therein might prevent call from returning.
2190 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2191 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2192 if (_ok) {
2193 _nm->print_nmethod(true);
2194 _ok = false;
2195 }
2196 }
2197 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2198 };
2199
2200 void nmethod::verify() {
2201
2202 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant
2203 // seems odd.
2204
2205 if (is_zombie() || is_not_entrant() || is_unloaded())
2206 return;
2207
2208 // Make sure all the entry points are correctly aligned for patching.
2209 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
2210
2211 // assert(oopDesc::is_oop(method()), "must be valid");
2212
2213 ResourceMark rm;
2214
2215 if (!CodeCache::contains(this)) {
2216 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this));
2217 }
2218
2219 if(is_native_method() )
2220 return;
2221
2222 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
2223 if (nm != this) {
2224 fatal("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this));
2225 }
2226
2227 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2228 if (! p->verify(this)) {
2229 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this));
2230 }
2231 }
2232
2233 #ifdef ASSERT
2234 #if INCLUDE_JVMCI
2235 {
2236 // Verify that implicit exceptions that deoptimize have a PcDesc and OopMap
2237 ImmutableOopMapSet* oms = oop_maps();
2238 ImplicitExceptionTable implicit_table(this);
2239 for (uint i = 0; i < implicit_table.len(); i++) {
2240 int exec_offset = (int) implicit_table.get_exec_offset(i);
2241 if (implicit_table.get_exec_offset(i) == implicit_table.get_cont_offset(i)) {
2242 assert(pc_desc_at(code_begin() + exec_offset) != NULL, "missing PcDesc");
2243 bool found = false;
2244 for (int i = 0, imax = oms->count(); i < imax; i++) {
2245 if (oms->pair_at(i)->pc_offset() == exec_offset) {
2246 found = true;
2247 break;
2248 }
2249 }
2250 assert(found, "missing oopmap");
2251 }
2252 }
2253 }
2254 #endif
2255 #endif
2256
2257 VerifyOopsClosure voc(this);
2258 oops_do(&voc);
2259 assert(voc.ok(), "embedded oops must be OK");
2260 Universe::heap()->verify_nmethod(this);
2261
2262 verify_scopes();
2263 }
2264
2265
2266 void nmethod::verify_interrupt_point(address call_site) {
2267 // Verify IC only when nmethod installation is finished.
2268 if (!is_not_installed()) {
2269 if (CompiledICLocker::is_safe(this)) {
2270 CompiledIC_at(this, call_site);
2271 } else {
2272 CompiledICLocker ml_verify(this);
2273 CompiledIC_at(this, call_site);
2274 }
2275 }
2276
2277 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address());
2278 assert(pd != NULL, "PcDesc must exist");
2279 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(),
2280 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(),
2281 pd->return_oop());
2282 !sd->is_top(); sd = sd->sender()) {
2283 sd->verify();
2284 }
2285 }
2286
2287 void nmethod::verify_scopes() {
2288 if( !method() ) return; // Runtime stubs have no scope
2289 if (method()->is_native()) return; // Ignore stub methods.
2290 // iterate through all interrupt point
2291 // and verify the debug information is valid.
2292 RelocIterator iter((nmethod*)this);
2293 while (iter.next()) {
2294 address stub = NULL;
2295 switch (iter.type()) {
2296 case relocInfo::virtual_call_type:
2297 verify_interrupt_point(iter.addr());
2298 break;
2299 case relocInfo::opt_virtual_call_type:
2300 stub = iter.opt_virtual_call_reloc()->static_stub(false);
2301 verify_interrupt_point(iter.addr());
2302 break;
2303 case relocInfo::static_call_type:
2304 stub = iter.static_call_reloc()->static_stub(false);
2305 //verify_interrupt_point(iter.addr());
2306 break;
2307 case relocInfo::runtime_call_type:
2308 case relocInfo::runtime_call_w_cp_type: {
2309 address destination = iter.reloc()->value();
2310 // Right now there is no way to find out which entries support
2311 // an interrupt point. It would be nice if we had this
2312 // information in a table.
2313 break;
2314 }
2315 default:
2316 break;
2317 }
2318 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section");
2319 }
2320 }
2321
2322
2323 // -----------------------------------------------------------------------------
2324 // Printing operations
2325
2326 void nmethod::print() const {
2327 ttyLocker ttyl; // keep the following output all in one block
2328 print(tty);
2329 }
2330
2331 void nmethod::print(outputStream* st) const {
2332 ResourceMark rm;
2333
2334 st->print("Compiled method ");
2335
2336 if (is_compiled_by_c1()) {
2337 st->print("(c1) ");
2338 } else if (is_compiled_by_c2()) {
2339 st->print("(c2) ");
2340 } else if (is_compiled_by_jvmci()) {
2341 st->print("(JVMCI) ");
2342 } else {
2343 st->print("(n/a) ");
2344 }
2345
2346 print_on(tty, NULL);
2347
2348 if (WizardMode) {
2349 st->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this));
2350 st->print(" for method " INTPTR_FORMAT , p2i(method()));
2351 st->print(" { ");
2352 st->print_cr("%s ", state());
2353 st->print_cr("}:");
2354 }
2355 if (size () > 0) st->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2356 p2i(this),
2357 p2i(this) + size(),
2358 size());
2359 if (relocation_size () > 0) st->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2360 p2i(relocation_begin()),
2361 p2i(relocation_end()),
2362 relocation_size());
2363 if (consts_size () > 0) st->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2364 p2i(consts_begin()),
2365 p2i(consts_end()),
2366 consts_size());
2367 if (insts_size () > 0) st->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2368 p2i(insts_begin()),
2369 p2i(insts_end()),
2370 insts_size());
2371 if (stub_size () > 0) st->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2372 p2i(stub_begin()),
2373 p2i(stub_end()),
2374 stub_size());
2375 if (oops_size () > 0) st->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2376 p2i(oops_begin()),
2377 p2i(oops_end()),
2378 oops_size());
2379 if (metadata_size () > 0) st->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2380 p2i(metadata_begin()),
2381 p2i(metadata_end()),
2382 metadata_size());
2383 if (scopes_data_size () > 0) st->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2384 p2i(scopes_data_begin()),
2385 p2i(scopes_data_end()),
2386 scopes_data_size());
2387 if (scopes_pcs_size () > 0) st->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2388 p2i(scopes_pcs_begin()),
2389 p2i(scopes_pcs_end()),
2390 scopes_pcs_size());
2391 if (dependencies_size () > 0) st->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2392 p2i(dependencies_begin()),
2393 p2i(dependencies_end()),
2394 dependencies_size());
2395 if (handler_table_size() > 0) st->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2396 p2i(handler_table_begin()),
2397 p2i(handler_table_end()),
2398 handler_table_size());
2399 if (nul_chk_table_size() > 0) st->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2400 p2i(nul_chk_table_begin()),
2401 p2i(nul_chk_table_end()),
2402 nul_chk_table_size());
2403 #if INCLUDE_JVMCI
2404 if (speculations_size () > 0) st->print_cr(" speculations [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2405 p2i(speculations_begin()),
2406 p2i(speculations_end()),
2407 speculations_size());
2408 if (jvmci_data_size () > 0) st->print_cr(" JVMCI data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2409 p2i(jvmci_data_begin()),
2410 p2i(jvmci_data_end()),
2411 jvmci_data_size());
2412 #endif
2413 }
2414
2415 void nmethod::print_code() {
2416 HandleMark hm;
2417 ResourceMark m;
2418 ttyLocker ttyl;
2419 // Call the specialized decode method of this class.
2420 decode(tty);
2421 }
2422
2423 #ifndef PRODUCT // called InstanceKlass methods are available only then. Declared as PRODUCT_RETURN
2424
2425 void nmethod::print_dependencies() {
2426 ResourceMark rm;
2427 ttyLocker ttyl; // keep the following output all in one block
2428 tty->print_cr("Dependencies:");
2429 for (Dependencies::DepStream deps(this); deps.next(); ) {
2430 deps.print_dependency();
2431 Klass* ctxk = deps.context_type();
2432 if (ctxk != NULL) {
2433 if (ctxk->is_instance_klass() && InstanceKlass::cast(ctxk)->is_dependent_nmethod(this)) {
2434 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name());
2435 }
2436 }
2437 deps.log_dependency(); // put it into the xml log also
2438 }
2439 }
2440 #endif
2441
2442 #if defined(SUPPORT_DATA_STRUCTS)
2443
2444 // Print the oops from the underlying CodeBlob.
2445 void nmethod::print_oops(outputStream* st) {
2446 HandleMark hm;
2447 ResourceMark m;
2448 st->print("Oops:");
2449 if (oops_begin() < oops_end()) {
2450 st->cr();
2451 for (oop* p = oops_begin(); p < oops_end(); p++) {
2452 Disassembler::print_location((unsigned char*)p, (unsigned char*)oops_begin(), (unsigned char*)oops_end(), st, true, false);
2453 st->print(PTR_FORMAT " ", *((uintptr_t*)p));
2454 if (*p == Universe::non_oop_word()) {
2455 st->print_cr("NON_OOP");
2456 continue; // skip non-oops
2457 }
2458 if (*p == NULL) {
2459 st->print_cr("NULL-oop");
2460 continue; // skip non-oops
2461 }
2462 (*p)->print_value_on(st);
2463 st->cr();
2464 }
2465 } else {
2466 st->print_cr(" <list empty>");
2467 }
2468 }
2469
2470 // Print metadata pool.
2471 void nmethod::print_metadata(outputStream* st) {
2472 HandleMark hm;
2473 ResourceMark m;
2474 st->print("Metadata:");
2475 if (metadata_begin() < metadata_end()) {
2476 st->cr();
2477 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
2478 Disassembler::print_location((unsigned char*)p, (unsigned char*)metadata_begin(), (unsigned char*)metadata_end(), st, true, false);
2479 st->print(PTR_FORMAT " ", *((uintptr_t*)p));
2480 if (*p && *p != Universe::non_oop_word()) {
2481 (*p)->print_value_on(st);
2482 }
2483 st->cr();
2484 }
2485 } else {
2486 st->print_cr(" <list empty>");
2487 }
2488 }
2489
2490 #ifndef PRODUCT // ScopeDesc::print_on() is available only then. Declared as PRODUCT_RETURN
2491 void nmethod::print_scopes_on(outputStream* st) {
2492 // Find the first pc desc for all scopes in the code and print it.
2493 ResourceMark rm;
2494 st->print("scopes:");
2495 if (scopes_pcs_begin() < scopes_pcs_end()) {
2496 st->cr();
2497 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2498 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
2499 continue;
2500
2501 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
2502 while (sd != NULL) {
2503 sd->print_on(st, p); // print output ends with a newline
2504 sd = sd->sender();
2505 }
2506 }
2507 } else {
2508 st->print_cr(" <list empty>");
2509 }
2510 }
2511 #endif
2512
2513 #ifndef PRODUCT // RelocIterator does support printing only then.
2514 void nmethod::print_relocations() {
2515 ResourceMark m; // in case methods get printed via the debugger
2516 tty->print_cr("relocations:");
2517 RelocIterator iter(this);
2518 iter.print();
2519 }
2520 #endif
2521
2522 void nmethod::print_pcs_on(outputStream* st) {
2523 ResourceMark m; // in case methods get printed via debugger
2524 st->print("pc-bytecode offsets:");
2525 if (scopes_pcs_begin() < scopes_pcs_end()) {
2526 st->cr();
2527 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2528 p->print_on(st, this); // print output ends with a newline
2529 }
2530 } else {
2531 st->print_cr(" <list empty>");
2532 }
2533 }
2534
2535 void nmethod::print_handler_table() {
2536 ExceptionHandlerTable(this).print();
2537 }
2538
2539 void nmethod::print_nul_chk_table() {
2540 ImplicitExceptionTable(this).print(code_begin());
2541 }
2542
2543 void nmethod::print_recorded_oops() {
2544 const int n = oops_count();
2545 const int log_n = (n<10) ? 1 : (n<100) ? 2 : (n<1000) ? 3 : (n<10000) ? 4 : 6;
2546 tty->print("Recorded oops:");
2547 if (n > 0) {
2548 tty->cr();
2549 for (int i = 0; i < n; i++) {
2550 oop o = oop_at(i);
2551 tty->print("#%*d: " INTPTR_FORMAT " ", log_n, i, p2i(o));
2552 if (o == (oop)Universe::non_oop_word()) {
2553 tty->print("non-oop word");
2554 } else if (o == NULL) {
2555 tty->print("NULL-oop");
2556 } else {
2557 o->print_value_on(tty);
2558 }
2559 tty->cr();
2560 }
2561 } else {
2562 tty->print_cr(" <list empty>");
2563 }
2564 }
2565
2566 void nmethod::print_recorded_metadata() {
2567 const int n = metadata_count();
2568 const int log_n = (n<10) ? 1 : (n<100) ? 2 : (n<1000) ? 3 : (n<10000) ? 4 : 6;
2569 tty->print("Recorded metadata:");
2570 if (n > 0) {
2571 tty->cr();
2572 for (int i = 0; i < n; i++) {
2573 Metadata* m = metadata_at(i);
2574 tty->print("#%*d: " INTPTR_FORMAT " ", log_n, i, p2i(m));
2575 if (m == (Metadata*)Universe::non_oop_word()) {
2576 tty->print("non-metadata word");
2577 } else if (m == NULL) {
2578 tty->print("NULL-oop");
2579 } else {
2580 Metadata::print_value_on_maybe_null(tty, m);
2581 }
2582 tty->cr();
2583 }
2584 } else {
2585 tty->print_cr(" <list empty>");
2586 }
2587 }
2588 #endif
2589
2590 #if defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_ABSTRACT_ASSEMBLY)
2591
2592 void nmethod::print_constant_pool(outputStream* st) {
2593 //-----------------------------------
2594 //---< Print the constant pool >---
2595 //-----------------------------------
2596 int consts_size = this->consts_size();
2597 if ( consts_size > 0 ) {
2598 unsigned char* cstart = this->consts_begin();
2599 unsigned char* cp = cstart;
2600 unsigned char* cend = cp + consts_size;
2601 unsigned int bytes_per_line = 4;
2602 unsigned int CP_alignment = 8;
2603 unsigned int n;
2604
2605 st->cr();
2606
2607 //---< print CP header to make clear what's printed >---
2608 if( ((uintptr_t)cp&(CP_alignment-1)) == 0 ) {
2609 n = bytes_per_line;
2610 st->print_cr("[Constant Pool]");
2611 Disassembler::print_location(cp, cstart, cend, st, true, true);
2612 Disassembler::print_hexdata(cp, n, st, true);
2613 st->cr();
2614 } else {
2615 n = (uintptr_t)cp&(bytes_per_line-1);
2616 st->print_cr("[Constant Pool (unaligned)]");
2617 }
2618
2619 //---< print CP contents, bytes_per_line at a time >---
2620 while (cp < cend) {
2621 Disassembler::print_location(cp, cstart, cend, st, true, false);
2622 Disassembler::print_hexdata(cp, n, st, false);
2623 cp += n;
2624 n = bytes_per_line;
2625 st->cr();
2626 }
2627
2628 //---< Show potential alignment gap between constant pool and code >---
2629 cend = code_begin();
2630 if( cp < cend ) {
2631 n = 4;
2632 st->print_cr("[Code entry alignment]");
2633 while (cp < cend) {
2634 Disassembler::print_location(cp, cstart, cend, st, false, false);
2635 cp += n;
2636 st->cr();
2637 }
2638 }
2639 } else {
2640 st->print_cr("[Constant Pool (empty)]");
2641 }
2642 st->cr();
2643 }
2644
2645 #endif
2646
2647 // Disassemble this nmethod.
2648 // Print additional debug information, if requested. This could be code
2649 // comments, block comments, profiling counters, etc.
2650 // The undisassembled format is useful no disassembler library is available.
2651 // The resulting hex dump (with markers) can be disassembled later, or on
2652 // another system, when/where a disassembler library is available.
2653 void nmethod::decode2(outputStream* ost) const {
2654
2655 // Called from frame::back_trace_with_decode without ResourceMark.
2656 ResourceMark rm;
2657
2658 // Make sure we have a valid stream to print on.
2659 outputStream* st = ost ? ost : tty;
2660
2661 #if defined(SUPPORT_ABSTRACT_ASSEMBLY) && ! defined(SUPPORT_ASSEMBLY)
2662 const bool use_compressed_format = true;
2663 const bool compressed_with_comments = use_compressed_format && (AbstractDisassembler::show_comment() ||
2664 AbstractDisassembler::show_block_comment());
2665 #else
2666 const bool use_compressed_format = Disassembler::is_abstract();
2667 const bool compressed_with_comments = use_compressed_format && (AbstractDisassembler::show_comment() ||
2668 AbstractDisassembler::show_block_comment());
2669 #endif
2670
2671 st->cr();
2672 this->print(st);
2673 st->cr();
2674
2675 #if defined(SUPPORT_ASSEMBLY)
2676 //----------------------------------
2677 //---< Print real disassembly >---
2678 //----------------------------------
2679 if (! use_compressed_format) {
2680 Disassembler::decode(const_cast<nmethod*>(this), st);
2681 return;
2682 }
2683 #endif
2684
2685 #if defined(SUPPORT_ABSTRACT_ASSEMBLY)
2686
2687 // Compressed undisassembled disassembly format.
2688 // The following stati are defined/supported:
2689 // = 0 - currently at bol() position, nothing printed yet on current line.
2690 // = 1 - currently at position after print_location().
2691 // > 1 - in the midst of printing instruction stream bytes.
2692 int compressed_format_idx = 0;
2693 int code_comment_column = 0;
2694 const int instr_maxlen = Assembler::instr_maxlen();
2695 const uint tabspacing = 8;
2696 unsigned char* start = this->code_begin();
2697 unsigned char* p = this->code_begin();
2698 unsigned char* end = this->code_end();
2699 unsigned char* pss = p; // start of a code section (used for offsets)
2700
2701 if ((start == NULL) || (end == NULL)) {
2702 st->print_cr("PrintAssembly not possible due to uninitialized section pointers");
2703 return;
2704 }
2705 #endif
2706
2707 #if defined(SUPPORT_ABSTRACT_ASSEMBLY)
2708 //---< plain abstract disassembly, no comments or anything, just section headers >---
2709 if (use_compressed_format && ! compressed_with_comments) {
2710 const_cast<nmethod*>(this)->print_constant_pool(st);
2711
2712 //---< Open the output (Marker for post-mortem disassembler) >---
2713 st->print_cr("[MachCode]");
2714 const char* header = NULL;
2715 address p0 = p;
2716 while (p < end) {
2717 address pp = p;
2718 while ((p < end) && (header == NULL)) {
2719 header = nmethod_section_label(p);
2720 pp = p;
2721 p += Assembler::instr_len(p);
2722 }
2723 if (pp > p0) {
2724 AbstractDisassembler::decode_range_abstract(p0, pp, start, end, st, Assembler::instr_maxlen());
2725 p0 = pp;
2726 p = pp;
2727 header = NULL;
2728 } else if (header != NULL) {
2729 st->bol();
2730 st->print_cr("%s", header);
2731 header = NULL;
2732 }
2733 }
2734 //---< Close the output (Marker for post-mortem disassembler) >---
2735 st->bol();
2736 st->print_cr("[/MachCode]");
2737 return;
2738 }
2739 #endif
2740
2741 #if defined(SUPPORT_ABSTRACT_ASSEMBLY)
2742 //---< abstract disassembly with comments and section headers merged in >---
2743 if (compressed_with_comments) {
2744 const_cast<nmethod*>(this)->print_constant_pool(st);
2745
2746 //---< Open the output (Marker for post-mortem disassembler) >---
2747 st->print_cr("[MachCode]");
2748 while ((p < end) && (p != NULL)) {
2749 const int instruction_size_in_bytes = Assembler::instr_len(p);
2750
2751 //---< Block comments for nmethod. Interrupts instruction stream, if any. >---
2752 // Outputs a bol() before and a cr() after, but only if a comment is printed.
2753 // Prints nmethod_section_label as well.
2754 if (AbstractDisassembler::show_block_comment()) {
2755 print_block_comment(st, p);
2756 if (st->position() == 0) {
2757 compressed_format_idx = 0;
2758 }
2759 }
2760
2761 //---< New location information after line break >---
2762 if (compressed_format_idx == 0) {
2763 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false);
2764 compressed_format_idx = 1;
2765 }
2766
2767 //---< Code comment for current instruction. Address range [p..(p+len)) >---
2768 unsigned char* p_end = p + (ssize_t)instruction_size_in_bytes;
2769 S390_ONLY(if (p_end > end) p_end = end;) // avoid getting past the end
2770
2771 if (AbstractDisassembler::show_comment() && const_cast<nmethod*>(this)->has_code_comment(p, p_end)) {
2772 //---< interrupt instruction byte stream for code comment >---
2773 if (compressed_format_idx > 1) {
2774 st->cr(); // interrupt byte stream
2775 st->cr(); // add an empty line
2776 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false);
2777 }
2778 const_cast<nmethod*>(this)->print_code_comment_on(st, code_comment_column, p, p_end );
2779 st->bol();
2780 compressed_format_idx = 0;
2781 }
2782
2783 //---< New location information after line break >---
2784 if (compressed_format_idx == 0) {
2785 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false);
2786 compressed_format_idx = 1;
2787 }
2788
2789 //---< Nicely align instructions for readability >---
2790 if (compressed_format_idx > 1) {
2791 Disassembler::print_delimiter(st);
2792 }
2793
2794 //---< Now, finally, print the actual instruction bytes >---
2795 unsigned char* p0 = p;
2796 p = Disassembler::decode_instruction_abstract(p, st, instruction_size_in_bytes, instr_maxlen);
2797 compressed_format_idx += p - p0;
2798
2799 if (Disassembler::start_newline(compressed_format_idx-1)) {
2800 st->cr();
2801 compressed_format_idx = 0;
2802 }
2803 }
2804 //---< Close the output (Marker for post-mortem disassembler) >---
2805 st->bol();
2806 st->print_cr("[/MachCode]");
2807 return;
2808 }
2809 #endif
2810 }
2811
2812 #if defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_ABSTRACT_ASSEMBLY)
2813
2814 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
2815 RelocIterator iter(this, begin, end);
2816 bool have_one = false;
2817 while (iter.next()) {
2818 have_one = true;
2819 switch (iter.type()) {
2820 case relocInfo::none: return "no_reloc";
2821 case relocInfo::oop_type: {
2822 // Get a non-resizable resource-allocated stringStream.
2823 // Our callees make use of (nested) ResourceMarks.
2824 stringStream st(NEW_RESOURCE_ARRAY(char, 1024), 1024);
2825 oop_Relocation* r = iter.oop_reloc();
2826 oop obj = r->oop_value();
2827 st.print("oop(");
2828 if (obj == NULL) st.print("NULL");
2829 else obj->print_value_on(&st);
2830 st.print(")");
2831 return st.as_string();
2832 }
2833 case relocInfo::metadata_type: {
2834 stringStream st;
2835 metadata_Relocation* r = iter.metadata_reloc();
2836 Metadata* obj = r->metadata_value();
2837 st.print("metadata(");
2838 if (obj == NULL) st.print("NULL");
2839 else obj->print_value_on(&st);
2840 st.print(")");
2841 return st.as_string();
2842 }
2843 case relocInfo::runtime_call_type:
2844 case relocInfo::runtime_call_w_cp_type: {
2845 stringStream st;
2846 st.print("runtime_call");
2847 CallRelocation* r = (CallRelocation*)iter.reloc();
2848 address dest = r->destination();
2849 CodeBlob* cb = CodeCache::find_blob(dest);
2850 if (cb != NULL) {
2851 st.print(" %s", cb->name());
2852 } else {
2853 ResourceMark rm;
2854 const int buflen = 1024;
2855 char* buf = NEW_RESOURCE_ARRAY(char, buflen);
2856 int offset;
2857 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) {
2858 st.print(" %s", buf);
2859 if (offset != 0) {
2860 st.print("+%d", offset);
2861 }
2862 }
2863 }
2864 return st.as_string();
2865 }
2866 case relocInfo::virtual_call_type: {
2867 stringStream st;
2868 st.print_raw("virtual_call");
2869 virtual_call_Relocation* r = iter.virtual_call_reloc();
2870 Method* m = r->method_value();
2871 if (m != NULL) {
2872 assert(m->is_method(), "");
2873 m->print_short_name(&st);
2874 }
2875 return st.as_string();
2876 }
2877 case relocInfo::opt_virtual_call_type: {
2878 stringStream st;
2879 st.print_raw("optimized virtual_call");
2880 opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc();
2881 Method* m = r->method_value();
2882 if (m != NULL) {
2883 assert(m->is_method(), "");
2884 m->print_short_name(&st);
2885 }
2886 return st.as_string();
2887 }
2888 case relocInfo::static_call_type: {
2889 stringStream st;
2890 st.print_raw("static_call");
2891 static_call_Relocation* r = iter.static_call_reloc();
2892 Method* m = r->method_value();
2893 if (m != NULL) {
2894 assert(m->is_method(), "");
2895 m->print_short_name(&st);
2896 }
2897 return st.as_string();
2898 }
2899 case relocInfo::static_stub_type: return "static_stub";
2900 case relocInfo::external_word_type: return "external_word";
2901 case relocInfo::internal_word_type: return "internal_word";
2902 case relocInfo::section_word_type: return "section_word";
2903 case relocInfo::poll_type: return "poll";
2904 case relocInfo::poll_return_type: return "poll_return";
2905 case relocInfo::trampoline_stub_type: return "trampoline_stub";
2906 case relocInfo::type_mask: return "type_bit_mask";
2907
2908 default:
2909 break;
2910 }
2911 }
2912 return have_one ? "other" : NULL;
2913 }
2914
2915 // Return a the last scope in (begin..end]
2916 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
2917 PcDesc* p = pc_desc_near(begin+1);
2918 if (p != NULL && p->real_pc(this) <= end) {
2919 return new ScopeDesc(this, p->scope_decode_offset(),
2920 p->obj_decode_offset(), p->should_reexecute(), p->rethrow_exception(),
2921 p->return_oop());
2922 }
2923 return NULL;
2924 }
2925
2926 const char* nmethod::nmethod_section_label(address pos) const {
2927 const char* label = NULL;
2928 if (pos == code_begin()) label = "[Instructions begin]";
2929 if (pos == entry_point()) label = "[Entry Point]";
2930 if (pos == verified_entry_point()) label = "[Verified Entry Point]";
2931 if (has_method_handle_invokes() && (pos == deopt_mh_handler_begin())) label = "[Deopt MH Handler Code]";
2932 if (pos == consts_begin() && pos != insts_begin()) label = "[Constants]";
2933 // Check stub_code before checking exception_handler or deopt_handler.
2934 if (pos == this->stub_begin()) label = "[Stub Code]";
2935 if (JVMCI_ONLY(_exception_offset >= 0 &&) pos == exception_begin()) label = "[Exception Handler]";
2936 if (JVMCI_ONLY(_deopt_handler_begin != NULL &&) pos == deopt_handler_begin()) label = "[Deopt Handler Code]";
2937 return label;
2938 }
2939
2940 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin, bool print_section_labels) const {
2941 if (print_section_labels) {
2942 const char* label = nmethod_section_label(block_begin);
2943 if (label != NULL) {
2944 stream->bol();
2945 stream->print_cr("%s", label);
2946 }
2947 }
2948
2949 if (block_begin == entry_point()) {
2950 methodHandle m = method();
2951 if (m.not_null()) {
2952 stream->print(" # ");
2953 m->print_value_on(stream);
2954 stream->cr();
2955 }
2956 if (m.not_null() && !is_osr_method()) {
2957 ResourceMark rm;
2958 int sizeargs = m->size_of_parameters();
2959 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
2960 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
2961 {
2962 int sig_index = 0;
2963 if (!m->is_static())
2964 sig_bt[sig_index++] = T_OBJECT; // 'this'
2965 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) {
2966 BasicType t = ss.type();
2967 sig_bt[sig_index++] = t;
2968 if (type2size[t] == 2) {
2969 sig_bt[sig_index++] = T_VOID;
2970 } else {
2971 assert(type2size[t] == 1, "size is 1 or 2");
2972 }
2973 }
2974 assert(sig_index == sizeargs, "");
2975 }
2976 const char* spname = "sp"; // make arch-specific?
2977 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false);
2978 int stack_slot_offset = this->frame_size() * wordSize;
2979 int tab1 = 14, tab2 = 24;
2980 int sig_index = 0;
2981 int arg_index = (m->is_static() ? 0 : -1);
2982 bool did_old_sp = false;
2983 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) {
2984 bool at_this = (arg_index == -1);
2985 bool at_old_sp = false;
2986 BasicType t = (at_this ? T_OBJECT : ss.type());
2987 assert(t == sig_bt[sig_index], "sigs in sync");
2988 if (at_this)
2989 stream->print(" # this: ");
2990 else
2991 stream->print(" # parm%d: ", arg_index);
2992 stream->move_to(tab1);
2993 VMReg fst = regs[sig_index].first();
2994 VMReg snd = regs[sig_index].second();
2995 if (fst->is_reg()) {
2996 stream->print("%s", fst->name());
2997 if (snd->is_valid()) {
2998 stream->print(":%s", snd->name());
2999 }
3000 } else if (fst->is_stack()) {
3001 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
3002 if (offset == stack_slot_offset) at_old_sp = true;
3003 stream->print("[%s+0x%x]", spname, offset);
3004 } else {
3005 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
3006 }
3007 stream->print(" ");
3008 stream->move_to(tab2);
3009 stream->print("= ");
3010 if (at_this) {
3011 m->method_holder()->print_value_on(stream);
3012 } else {
3013 bool did_name = false;
3014 if (!at_this && ss.is_object()) {
3015 Symbol* name = ss.as_symbol_or_null();
3016 if (name != NULL) {
3017 name->print_value_on(stream);
3018 did_name = true;
3019 }
3020 }
3021 if (!did_name)
3022 stream->print("%s", type2name(t));
3023 }
3024 if (at_old_sp) {
3025 stream->print(" (%s of caller)", spname);
3026 did_old_sp = true;
3027 }
3028 stream->cr();
3029 sig_index += type2size[t];
3030 arg_index += 1;
3031 if (!at_this) ss.next();
3032 }
3033 if (!did_old_sp) {
3034 stream->print(" # ");
3035 stream->move_to(tab1);
3036 stream->print("[%s+0x%x]", spname, stack_slot_offset);
3037 stream->print(" (%s of caller)", spname);
3038 stream->cr();
3039 }
3040 }
3041 }
3042 }
3043
3044 // Returns whether this nmethod has code comments.
3045 bool nmethod::has_code_comment(address begin, address end) {
3046 // scopes?
3047 ScopeDesc* sd = scope_desc_in(begin, end);
3048 if (sd != NULL) return true;
3049
3050 // relocations?
3051 const char* str = reloc_string_for(begin, end);
3052 if (str != NULL) return true;
3053
3054 // implicit exceptions?
3055 int cont_offset = ImplicitExceptionTable(this).continuation_offset(begin - code_begin());
3056 if (cont_offset != 0) return true;
3057
3058 return false;
3059 }
3060
3061 void nmethod::print_code_comment_on(outputStream* st, int column, address begin, address end) {
3062 ImplicitExceptionTable implicit_table(this);
3063 int pc_offset = begin - code_begin();
3064 int cont_offset = implicit_table.continuation_offset(pc_offset);
3065 bool oop_map_required = false;
3066 if (cont_offset != 0) {
3067 st->move_to(column, 6, 0);
3068 if (pc_offset == cont_offset) {
3069 st->print("; implicit exception: deoptimizes");
3070 oop_map_required = true;
3071 } else {
3072 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset));
3073 }
3074 }
3075
3076 // Find an oopmap in (begin, end]. We use the odd half-closed
3077 // interval so that oop maps and scope descs which are tied to the
3078 // byte after a call are printed with the call itself. OopMaps
3079 // associated with implicit exceptions are printed with the implicit
3080 // instruction.
3081 address base = code_begin();
3082 ImmutableOopMapSet* oms = oop_maps();
3083 if (oms != NULL) {
3084 for (int i = 0, imax = oms->count(); i < imax; i++) {
3085 const ImmutableOopMapPair* pair = oms->pair_at(i);
3086 const ImmutableOopMap* om = pair->get_from(oms);
3087 address pc = base + pair->pc_offset();
3088 if (pc >= begin) {
3089 #if INCLUDE_JVMCI
3090 bool is_implicit_deopt = implicit_table.continuation_offset(pair->pc_offset()) == (uint) pair->pc_offset();
3091 #else
3092 bool is_implicit_deopt = false;
3093 #endif
3094 if (is_implicit_deopt ? pc == begin : pc > begin && pc <= end) {
3095 st->move_to(column, 6, 0);
3096 st->print("; ");
3097 om->print_on(st);
3098 oop_map_required = false;
3099 }
3100 }
3101 if (pc > end) {
3102 break;
3103 }
3104 }
3105 }
3106 assert(!oop_map_required, "missed oopmap");
3107
3108 // Print any debug info present at this pc.
3109 ScopeDesc* sd = scope_desc_in(begin, end);
3110 if (sd != NULL) {
3111 st->move_to(column, 6, 0);
3112 if (sd->bci() == SynchronizationEntryBCI) {
3113 st->print(";*synchronization entry");
3114 } else if (sd->bci() == AfterBci) {
3115 st->print(";* method exit (unlocked if synchronized)");
3116 } else if (sd->bci() == UnwindBci) {
3117 st->print(";* unwind (locked if synchronized)");
3118 } else if (sd->bci() == AfterExceptionBci) {
3119 st->print(";* unwind (unlocked if synchronized)");
3120 } else if (sd->bci() == UnknownBci) {
3121 st->print(";* unknown");
3122 } else if (sd->bci() == InvalidFrameStateBci) {
3123 st->print(";* invalid frame state");
3124 } else {
3125 if (sd->method() == NULL) {
3126 st->print("method is NULL");
3127 } else if (sd->method()->is_native()) {
3128 st->print("method is native");
3129 } else {
3130 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci());
3131 st->print(";*%s", Bytecodes::name(bc));
3132 switch (bc) {
3133 case Bytecodes::_invokevirtual:
3134 case Bytecodes::_invokespecial:
3135 case Bytecodes::_invokestatic:
3136 case Bytecodes::_invokeinterface:
3137 {
3138 Bytecode_invoke invoke(sd->method(), sd->bci());
3139 st->print(" ");
3140 if (invoke.name() != NULL)
3141 invoke.name()->print_symbol_on(st);
3142 else
3143 st->print("<UNKNOWN>");
3144 break;
3145 }
3146 case Bytecodes::_getfield:
3147 case Bytecodes::_putfield:
3148 case Bytecodes::_getstatic:
3149 case Bytecodes::_putstatic:
3150 {
3151 Bytecode_field field(sd->method(), sd->bci());
3152 st->print(" ");
3153 if (field.name() != NULL)
3154 field.name()->print_symbol_on(st);
3155 else
3156 st->print("<UNKNOWN>");
3157 }
3158 default:
3159 break;
3160 }
3161 }
3162 st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop());
3163 }
3164
3165 // Print all scopes
3166 for (;sd != NULL; sd = sd->sender()) {
3167 st->move_to(column, 6, 0);
3168 st->print("; -");
3169 if (sd->should_reexecute()) {
3170 st->print(" (reexecute)");
3171 }
3172 if (sd->method() == NULL) {
3173 st->print("method is NULL");
3174 } else {
3175 sd->method()->print_short_name(st);
3176 }
3177 int lineno = sd->method()->line_number_from_bci(sd->bci());
3178 if (lineno != -1) {
3179 st->print("@%d (line %d)", sd->bci(), lineno);
3180 } else {
3181 st->print("@%d", sd->bci());
3182 }
3183 st->cr();
3184 }
3185 }
3186
3187 // Print relocation information
3188 // Prevent memory leak: allocating without ResourceMark.
3189 ResourceMark rm;
3190 const char* str = reloc_string_for(begin, end);
3191 if (str != NULL) {
3192 if (sd != NULL) st->cr();
3193 st->move_to(column, 6, 0);
3194 st->print("; {%s}", str);
3195 }
3196 }
3197
3198 #endif
3199
3200 class DirectNativeCallWrapper: public NativeCallWrapper {
3201 private:
3202 NativeCall* _call;
3203
3204 public:
3205 DirectNativeCallWrapper(NativeCall* call) : _call(call) {}
3206
3207 virtual address destination() const { return _call->destination(); }
3208 virtual address instruction_address() const { return _call->instruction_address(); }
3209 virtual address next_instruction_address() const { return _call->next_instruction_address(); }
3210 virtual address return_address() const { return _call->return_address(); }
3211
3212 virtual address get_resolve_call_stub(bool is_optimized) const {
3213 if (is_optimized) {
3214 return SharedRuntime::get_resolve_opt_virtual_call_stub();
3215 }
3216 return SharedRuntime::get_resolve_virtual_call_stub();
3217 }
3218
3219 virtual void set_destination_mt_safe(address dest) {
3220 #if INCLUDE_AOT
3221 if (UseAOT) {
3222 CodeBlob* callee = CodeCache::find_blob(dest);
3223 CompiledMethod* cm = callee->as_compiled_method_or_null();
3224 if (cm != NULL && cm->is_far_code()) {
3225 // Temporary fix, see JDK-8143106
3226 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address());
3227 csc->set_to_far(methodHandle(cm->method()), dest);
3228 return;
3229 }
3230 }
3231 #endif
3232 _call->set_destination_mt_safe(dest);
3233 }
3234
3235 virtual void set_to_interpreted(const methodHandle& method, CompiledICInfo& info) {
3236 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address());
3237 #if INCLUDE_AOT
3238 if (info.to_aot()) {
3239 csc->set_to_far(method, info.entry());
3240 } else
3241 #endif
3242 {
3243 csc->set_to_interpreted(method, info.entry());
3244 }
3245 }
3246
3247 virtual void verify() const {
3248 // make sure code pattern is actually a call imm32 instruction
3249 _call->verify();
3250 _call->verify_alignment();
3251 }
3252
3253 virtual void verify_resolve_call(address dest) const {
3254 CodeBlob* db = CodeCache::find_blob_unsafe(dest);
3255 assert(db != NULL && !db->is_adapter_blob(), "must use stub!");
3256 }
3257
3258 virtual bool is_call_to_interpreted(address dest) const {
3259 CodeBlob* cb = CodeCache::find_blob(_call->instruction_address());
3260 return cb->contains(dest);
3261 }
3262
3263 virtual bool is_safe_for_patching() const { return false; }
3264
3265 virtual NativeInstruction* get_load_instruction(virtual_call_Relocation* r) const {
3266 return nativeMovConstReg_at(r->cached_value());
3267 }
3268
3269 virtual void *get_data(NativeInstruction* instruction) const {
3270 return (void*)((NativeMovConstReg*) instruction)->data();
3271 }
3272
3273 virtual void set_data(NativeInstruction* instruction, intptr_t data) {
3274 ((NativeMovConstReg*) instruction)->set_data(data);
3275 }
3276 };
3277
3278 NativeCallWrapper* nmethod::call_wrapper_at(address call) const {
3279 return new DirectNativeCallWrapper((NativeCall*) call);
3280 }
3281
3282 NativeCallWrapper* nmethod::call_wrapper_before(address return_pc) const {
3283 return new DirectNativeCallWrapper(nativeCall_before(return_pc));
3284 }
3285
3286 address nmethod::call_instruction_address(address pc) const {
3287 if (NativeCall::is_call_before(pc)) {
3288 NativeCall *ncall = nativeCall_before(pc);
3289 return ncall->instruction_address();
3290 }
3291 return NULL;
3292 }
3293
3294 CompiledStaticCall* nmethod::compiledStaticCall_at(Relocation* call_site) const {
3295 return CompiledDirectStaticCall::at(call_site);
3296 }
3297
3298 CompiledStaticCall* nmethod::compiledStaticCall_at(address call_site) const {
3299 return CompiledDirectStaticCall::at(call_site);
3300 }
3301
3302 CompiledStaticCall* nmethod::compiledStaticCall_before(address return_addr) const {
3303 return CompiledDirectStaticCall::before(return_addr);
3304 }
3305
3306 #if defined(SUPPORT_DATA_STRUCTS)
3307 void nmethod::print_value_on(outputStream* st) const {
3308 st->print("nmethod");
3309 print_on(st, NULL);
3310 }
3311 #endif
3312
3313 #ifndef PRODUCT
3314
3315 void nmethod::print_calls(outputStream* st) {
3316 RelocIterator iter(this);
3317 while (iter.next()) {
3318 switch (iter.type()) {
3319 case relocInfo::virtual_call_type:
3320 case relocInfo::opt_virtual_call_type: {
3321 CompiledICLocker ml_verify(this);
3322 CompiledIC_at(&iter)->print();
3323 break;
3324 }
3325 case relocInfo::static_call_type:
3326 st->print_cr("Static call at " INTPTR_FORMAT, p2i(iter.reloc()->addr()));
3327 CompiledDirectStaticCall::at(iter.reloc())->print();
3328 break;
3329 default:
3330 break;
3331 }
3332 }
3333 }
3334
3335 void nmethod::print_statistics() {
3336 ttyLocker ttyl;
3337 if (xtty != NULL) xtty->head("statistics type='nmethod'");
3338 native_nmethod_stats.print_native_nmethod_stats();
3339 #ifdef COMPILER1
3340 c1_java_nmethod_stats.print_nmethod_stats("C1");
3341 #endif
3342 #ifdef COMPILER2
3343 c2_java_nmethod_stats.print_nmethod_stats("C2");
3344 #endif
3345 #if INCLUDE_JVMCI
3346 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI");
3347 #endif
3348 unknown_java_nmethod_stats.print_nmethod_stats("Unknown");
3349 DebugInformationRecorder::print_statistics();
3350 #ifndef PRODUCT
3351 pc_nmethod_stats.print_pc_stats();
3352 #endif
3353 Dependencies::print_statistics();
3354 if (xtty != NULL) xtty->tail("statistics");
3355 }
3356
3357 #endif // !PRODUCT
3358
3359 #if INCLUDE_JVMCI
3360 void nmethod::update_speculation(JavaThread* thread) {
3361 jlong speculation = thread->pending_failed_speculation();
3362 if (speculation != 0) {
3363 guarantee(jvmci_nmethod_data() != NULL, "failed speculation in nmethod without failed speculation list");
3364 jvmci_nmethod_data()->add_failed_speculation(this, speculation);
3365 thread->set_pending_failed_speculation(0);
3366 }
3367 }
3368
3369 const char* nmethod::jvmci_name() {
3370 if (jvmci_nmethod_data() != NULL) {
3371 return jvmci_nmethod_data()->name();
3372 }
3373 return NULL;
3374 }
3375 #endif