1 /*
2 * Copyright (c) 1997, 2017, 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 "code/codeCache.hpp"
27 #include "code/compiledIC.hpp"
28 #include "code/dependencies.hpp"
29 #include "code/nativeInst.hpp"
30 #include "code/nmethod.hpp"
31 #include "code/scopeDesc.hpp"
32 #include "compiler/abstractCompiler.hpp"
33 #include "compiler/compileBroker.hpp"
34 #include "compiler/compileLog.hpp"
35 #include "compiler/compilerDirectives.hpp"
36 #include "compiler/directivesParser.hpp"
37 #include "compiler/disassembler.hpp"
38 #include "interpreter/bytecode.hpp"
39 #include "logging/log.hpp"
40 #include "memory/resourceArea.hpp"
41 #include "oops/methodData.hpp"
42 #include "oops/oop.inline.hpp"
43 #include "prims/jvmtiImpl.hpp"
44 #include "runtime/atomic.hpp"
45 #include "runtime/orderAccess.inline.hpp"
46 #include "runtime/os.hpp"
47 #include "runtime/sharedRuntime.hpp"
48 #include "runtime/sweeper.hpp"
49 #include "utilities/resourceHash.hpp"
50 #include "utilities/dtrace.hpp"
51 #include "utilities/events.hpp"
52 #include "utilities/xmlstream.hpp"
53 #include "logging/log.hpp"
54 #ifdef SHARK
55 #include "shark/sharkCompiler.hpp"
56 #endif
57 #if INCLUDE_JVMCI
58 #include "jvmci/jvmciJavaClasses.hpp"
59 #endif
60
61 #ifdef DTRACE_ENABLED
62
63 // Only bother with this argument setup if dtrace is available
64
65 #define DTRACE_METHOD_UNLOAD_PROBE(method) \
66 { \
67 Method* m = (method); \
68 if (m != NULL) { \
69 Symbol* klass_name = m->klass_name(); \
70 Symbol* name = m->name(); \
71 Symbol* signature = m->signature(); \
72 HOTSPOT_COMPILED_METHOD_UNLOAD( \
73 (char *) klass_name->bytes(), klass_name->utf8_length(), \
74 (char *) name->bytes(), name->utf8_length(), \
75 (char *) signature->bytes(), signature->utf8_length()); \
76 } \
77 }
78
79 #else // ndef DTRACE_ENABLED
80
81 #define DTRACE_METHOD_UNLOAD_PROBE(method)
82
83 #endif
84
85 //---------------------------------------------------------------------------------
86 // NMethod statistics
87 // They are printed under various flags, including:
88 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation.
89 // (In the latter two cases, they like other stats are printed to the log only.)
90
91 #ifndef PRODUCT
92 // These variables are put into one block to reduce relocations
93 // and make it simpler to print from the debugger.
94 struct java_nmethod_stats_struct {
95 int nmethod_count;
96 int total_size;
97 int relocation_size;
98 int consts_size;
99 int insts_size;
100 int stub_size;
101 int scopes_data_size;
102 int scopes_pcs_size;
103 int dependencies_size;
104 int handler_table_size;
105 int nul_chk_table_size;
106 int oops_size;
107 int metadata_size;
108
109 void note_nmethod(nmethod* nm) {
110 nmethod_count += 1;
111 total_size += nm->size();
112 relocation_size += nm->relocation_size();
113 consts_size += nm->consts_size();
114 insts_size += nm->insts_size();
115 stub_size += nm->stub_size();
116 oops_size += nm->oops_size();
117 metadata_size += nm->metadata_size();
118 scopes_data_size += nm->scopes_data_size();
119 scopes_pcs_size += nm->scopes_pcs_size();
120 dependencies_size += nm->dependencies_size();
121 handler_table_size += nm->handler_table_size();
122 nul_chk_table_size += nm->nul_chk_table_size();
123 }
124 void print_nmethod_stats(const char* name) {
125 if (nmethod_count == 0) return;
126 tty->print_cr("Statistics for %d bytecoded nmethods for %s:", nmethod_count, name);
127 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size);
128 if (nmethod_count != 0) tty->print_cr(" header = " SIZE_FORMAT, nmethod_count * sizeof(nmethod));
129 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size);
130 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size);
131 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size);
132 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size);
133 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size);
134 if (metadata_size != 0) tty->print_cr(" metadata = %d", metadata_size);
135 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size);
136 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size);
137 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size);
138 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size);
139 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size);
140 }
141 };
142
143 struct native_nmethod_stats_struct {
144 int native_nmethod_count;
145 int native_total_size;
146 int native_relocation_size;
147 int native_insts_size;
148 int native_oops_size;
149 int native_metadata_size;
150 void note_native_nmethod(nmethod* nm) {
151 native_nmethod_count += 1;
152 native_total_size += nm->size();
153 native_relocation_size += nm->relocation_size();
154 native_insts_size += nm->insts_size();
155 native_oops_size += nm->oops_size();
156 native_metadata_size += nm->metadata_size();
157 }
158 void print_native_nmethod_stats() {
159 if (native_nmethod_count == 0) return;
160 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count);
161 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size);
162 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size);
163 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size);
164 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size);
165 if (native_metadata_size != 0) tty->print_cr(" N. metadata = %d", native_metadata_size);
166 }
167 };
168
169 struct pc_nmethod_stats_struct {
170 int pc_desc_resets; // number of resets (= number of caches)
171 int pc_desc_queries; // queries to nmethod::find_pc_desc
172 int pc_desc_approx; // number of those which have approximate true
173 int pc_desc_repeats; // number of _pc_descs[0] hits
174 int pc_desc_hits; // number of LRU cache hits
175 int pc_desc_tests; // total number of PcDesc examinations
176 int pc_desc_searches; // total number of quasi-binary search steps
177 int pc_desc_adds; // number of LUR cache insertions
178
179 void print_pc_stats() {
180 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query",
181 pc_desc_queries,
182 (double)(pc_desc_tests + pc_desc_searches)
183 / pc_desc_queries);
184 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d",
185 pc_desc_resets,
186 pc_desc_queries, pc_desc_approx,
187 pc_desc_repeats, pc_desc_hits,
188 pc_desc_tests, pc_desc_searches, pc_desc_adds);
189 }
190 };
191
192 #ifdef COMPILER1
193 static java_nmethod_stats_struct c1_java_nmethod_stats;
194 #endif
195 #ifdef COMPILER2
196 static java_nmethod_stats_struct c2_java_nmethod_stats;
197 #endif
198 #if INCLUDE_JVMCI
199 static java_nmethod_stats_struct jvmci_java_nmethod_stats;
200 #endif
201 #ifdef SHARK
202 static java_nmethod_stats_struct shark_java_nmethod_stats;
203 #endif
204 static java_nmethod_stats_struct unknown_java_nmethod_stats;
205
206 static native_nmethod_stats_struct native_nmethod_stats;
207 static pc_nmethod_stats_struct pc_nmethod_stats;
208
209 static void note_java_nmethod(nmethod* nm) {
210 #ifdef COMPILER1
211 if (nm->is_compiled_by_c1()) {
212 c1_java_nmethod_stats.note_nmethod(nm);
213 } else
214 #endif
215 #ifdef COMPILER2
216 if (nm->is_compiled_by_c2()) {
217 c2_java_nmethod_stats.note_nmethod(nm);
218 } else
219 #endif
220 #if INCLUDE_JVMCI
221 if (nm->is_compiled_by_jvmci()) {
222 jvmci_java_nmethod_stats.note_nmethod(nm);
223 } else
224 #endif
225 #ifdef SHARK
226 if (nm->is_compiled_by_shark()) {
227 shark_java_nmethod_stats.note_nmethod(nm);
228 } else
229 #endif
230 {
231 unknown_java_nmethod_stats.note_nmethod(nm);
232 }
233 }
234 #endif // !PRODUCT
235
236 //---------------------------------------------------------------------------------
237
238
239 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) {
240 assert(pc != NULL, "Must be non null");
241 assert(exception.not_null(), "Must be non null");
242 assert(handler != NULL, "Must be non null");
243
244 _count = 0;
245 _exception_type = exception->klass();
246 _next = NULL;
247
248 add_address_and_handler(pc,handler);
249 }
250
251
252 address ExceptionCache::match(Handle exception, address pc) {
253 assert(pc != NULL,"Must be non null");
254 assert(exception.not_null(),"Must be non null");
255 if (exception->klass() == exception_type()) {
256 return (test_address(pc));
257 }
258
259 return NULL;
260 }
261
262
263 bool ExceptionCache::match_exception_with_space(Handle exception) {
264 assert(exception.not_null(),"Must be non null");
265 if (exception->klass() == exception_type() && count() < cache_size) {
266 return true;
267 }
268 return false;
269 }
270
271
272 address ExceptionCache::test_address(address addr) {
273 int limit = count();
274 for (int i = 0; i < limit; i++) {
275 if (pc_at(i) == addr) {
276 return handler_at(i);
277 }
278 }
279 return NULL;
280 }
281
282
283 bool ExceptionCache::add_address_and_handler(address addr, address handler) {
284 if (test_address(addr) == handler) return true;
285
286 int index = count();
287 if (index < cache_size) {
288 set_pc_at(index, addr);
289 set_handler_at(index, handler);
290 increment_count();
291 return true;
292 }
293 return false;
294 }
295
296 //-----------------------------------------------------------------------------
297
298
299 // Helper used by both find_pc_desc methods.
300 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) {
301 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_tests);
302 if (!approximate)
303 return pc->pc_offset() == pc_offset;
304 else
305 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset();
306 }
307
308 void PcDescCache::reset_to(PcDesc* initial_pc_desc) {
309 if (initial_pc_desc == NULL) {
310 _pc_descs[0] = NULL; // native method; no PcDescs at all
311 return;
312 }
313 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_resets);
314 // reset the cache by filling it with benign (non-null) values
315 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel");
316 for (int i = 0; i < cache_size; i++)
317 _pc_descs[i] = initial_pc_desc;
318 }
319
320 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) {
321 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_queries);
322 NOT_PRODUCT(if (approximate) ++pc_nmethod_stats.pc_desc_approx);
323
324 // Note: one might think that caching the most recently
325 // read value separately would be a win, but one would be
326 // wrong. When many threads are updating it, the cache
327 // line it's in would bounce between caches, negating
328 // any benefit.
329
330 // In order to prevent race conditions do not load cache elements
331 // repeatedly, but use a local copy:
332 PcDesc* res;
333
334 // Step one: Check the most recently added value.
335 res = _pc_descs[0];
336 if (res == NULL) return NULL; // native method; no PcDescs at all
337 if (match_desc(res, pc_offset, approximate)) {
338 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_repeats);
339 return res;
340 }
341
342 // Step two: Check the rest of the LRU cache.
343 for (int i = 1; i < cache_size; ++i) {
344 res = _pc_descs[i];
345 if (res->pc_offset() < 0) break; // optimization: skip empty cache
346 if (match_desc(res, pc_offset, approximate)) {
347 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_hits);
348 return res;
349 }
350 }
351
352 // Report failure.
353 return NULL;
354 }
355
356 void PcDescCache::add_pc_desc(PcDesc* pc_desc) {
357 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_adds);
358 // Update the LRU cache by shifting pc_desc forward.
359 for (int i = 0; i < cache_size; i++) {
360 PcDesc* next = _pc_descs[i];
361 _pc_descs[i] = pc_desc;
362 pc_desc = next;
363 }
364 }
365
366 // adjust pcs_size so that it is a multiple of both oopSize and
367 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple
368 // of oopSize, then 2*sizeof(PcDesc) is)
369 static int adjust_pcs_size(int pcs_size) {
370 int nsize = round_to(pcs_size, oopSize);
371 if ((nsize % sizeof(PcDesc)) != 0) {
372 nsize = pcs_size + sizeof(PcDesc);
373 }
374 assert((nsize % oopSize) == 0, "correct alignment");
375 return nsize;
376 }
377
378
379 int nmethod::total_size() const {
380 return
381 consts_size() +
382 insts_size() +
383 stub_size() +
384 scopes_data_size() +
385 scopes_pcs_size() +
386 handler_table_size() +
387 nul_chk_table_size();
388 }
389
390 const char* nmethod::compile_kind() const {
391 if (is_osr_method()) return "osr";
392 if (method() != NULL && is_native_method()) return "c2n";
393 return NULL;
394 }
395
396 // Fill in default values for various flag fields
397 void nmethod::init_defaults() {
398 _state = in_use;
399 _has_flushed_dependencies = 0;
400 _lock_count = 0;
401 _stack_traversal_mark = 0;
402 _unload_reported = false; // jvmti state
403 _is_far_code = false; // nmethods are located in CodeCache
404
405 #ifdef ASSERT
406 _oops_are_stale = false;
407 #endif
408
409 _oops_do_mark_link = NULL;
410 _jmethod_id = NULL;
411 _osr_link = NULL;
412 if (UseG1GC) {
413 _unloading_next = NULL;
414 } else {
415 _scavenge_root_link = NULL;
416 }
417 _scavenge_root_state = 0;
418 #if INCLUDE_RTM_OPT
419 _rtm_state = NoRTM;
420 #endif
421 #if INCLUDE_JVMCI
422 _jvmci_installed_code = NULL;
423 _speculation_log = NULL;
424 #endif
425 }
426
427 nmethod* nmethod::new_native_nmethod(const methodHandle& method,
428 int compile_id,
429 CodeBuffer *code_buffer,
430 int vep_offset,
431 int frame_complete,
432 int frame_size,
433 ByteSize basic_lock_owner_sp_offset,
434 ByteSize basic_lock_sp_offset,
435 OopMapSet* oop_maps) {
436 code_buffer->finalize_oop_references(method);
437 // create nmethod
438 nmethod* nm = NULL;
439 {
440 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
441 int native_nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod));
442 CodeOffsets offsets;
443 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
444 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
445 nm = new (native_nmethod_size, CompLevel_none) nmethod(method(), compiler_none, native_nmethod_size,
446 compile_id, &offsets,
447 code_buffer, frame_size,
448 basic_lock_owner_sp_offset,
449 basic_lock_sp_offset, oop_maps);
450 NOT_PRODUCT(if (nm != NULL) native_nmethod_stats.note_native_nmethod(nm));
451 }
452 // verify nmethod
453 debug_only(if (nm) nm->verify();) // might block
454
455 if (nm != NULL) {
456 nm->log_new_nmethod();
457 }
458
459 return nm;
460 }
461
462 nmethod* nmethod::new_nmethod(const methodHandle& method,
463 int compile_id,
464 int entry_bci,
465 CodeOffsets* offsets,
466 int orig_pc_offset,
467 DebugInformationRecorder* debug_info,
468 Dependencies* dependencies,
469 CodeBuffer* code_buffer, int frame_size,
470 OopMapSet* oop_maps,
471 ExceptionHandlerTable* handler_table,
472 ImplicitExceptionTable* nul_chk_table,
473 AbstractCompiler* compiler,
474 int comp_level
475 #if INCLUDE_JVMCI
476 , Handle installed_code,
477 Handle speculationLog
478 #endif
479 )
480 {
481 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
482 code_buffer->finalize_oop_references(method);
483 // create nmethod
484 nmethod* nm = NULL;
485 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
486 int nmethod_size =
487 CodeBlob::allocation_size(code_buffer, sizeof(nmethod))
488 + adjust_pcs_size(debug_info->pcs_size())
489 + round_to(dependencies->size_in_bytes() , oopSize)
490 + round_to(handler_table->size_in_bytes(), oopSize)
491 + round_to(nul_chk_table->size_in_bytes(), oopSize)
492 + round_to(debug_info->data_size() , oopSize);
493
494 nm = new (nmethod_size, comp_level)
495 nmethod(method(), compiler->type(), nmethod_size, compile_id, entry_bci, offsets,
496 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size,
497 oop_maps,
498 handler_table,
499 nul_chk_table,
500 compiler,
501 comp_level
502 #if INCLUDE_JVMCI
503 , installed_code,
504 speculationLog
505 #endif
506 );
507
508 if (nm != NULL) {
509 // To make dependency checking during class loading fast, record
510 // the nmethod dependencies in the classes it is dependent on.
511 // This allows the dependency checking code to simply walk the
512 // class hierarchy above the loaded class, checking only nmethods
513 // which are dependent on those classes. The slow way is to
514 // check every nmethod for dependencies which makes it linear in
515 // the number of methods compiled. For applications with a lot
516 // classes the slow way is too slow.
517 for (Dependencies::DepStream deps(nm); deps.next(); ) {
518 if (deps.type() == Dependencies::call_site_target_value) {
519 // CallSite dependencies are managed on per-CallSite instance basis.
520 oop call_site = deps.argument_oop(0);
521 MethodHandles::add_dependent_nmethod(call_site, nm);
522 } else {
523 Klass* klass = deps.context_type();
524 if (klass == NULL) {
525 continue; // ignore things like evol_method
526 }
527 // record this nmethod as dependent on this klass
528 InstanceKlass::cast(klass)->add_dependent_nmethod(nm);
529 }
530 }
531 NOT_PRODUCT(if (nm != NULL) note_java_nmethod(nm));
532 }
533 }
534 // Do verification and logging outside CodeCache_lock.
535 if (nm != NULL) {
536 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
537 DEBUG_ONLY(nm->verify();)
538 nm->log_new_nmethod();
539 }
540 return nm;
541 }
542
543 // For native wrappers
544 nmethod::nmethod(
545 Method* method,
546 CompilerType type,
547 int nmethod_size,
548 int compile_id,
549 CodeOffsets* offsets,
550 CodeBuffer* code_buffer,
551 int frame_size,
552 ByteSize basic_lock_owner_sp_offset,
553 ByteSize basic_lock_sp_offset,
554 OopMapSet* oop_maps )
555 : CompiledMethod(method, "native nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false),
556 _native_receiver_sp_offset(basic_lock_owner_sp_offset),
557 _native_basic_lock_sp_offset(basic_lock_sp_offset)
558 {
559 {
560 int scopes_data_offset = 0;
561 int deoptimize_offset = 0;
562 int deoptimize_mh_offset = 0;
563
564 debug_only(NoSafepointVerifier nsv;)
565 assert_locked_or_safepoint(CodeCache_lock);
566
567 init_defaults();
568 _entry_bci = InvocationEntryBci;
569 // We have no exception handler or deopt handler make the
570 // values something that will never match a pc like the nmethod vtable entry
571 _exception_offset = 0;
572 _orig_pc_offset = 0;
573
574 _consts_offset = data_offset();
575 _stub_offset = data_offset();
576 _oops_offset = data_offset();
577 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize);
578 scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize);
579 _scopes_pcs_offset = scopes_data_offset;
580 _dependencies_offset = _scopes_pcs_offset;
581 _handler_table_offset = _dependencies_offset;
582 _nul_chk_table_offset = _handler_table_offset;
583 _nmethod_end_offset = _nul_chk_table_offset;
584 _compile_id = compile_id;
585 _comp_level = CompLevel_none;
586 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
587 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
588 _osr_entry_point = NULL;
589 _exception_cache = NULL;
590 _pc_desc_container.reset_to(NULL);
591 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
592
593 _scopes_data_begin = (address) this + scopes_data_offset;
594 _deopt_handler_begin = (address) this + deoptimize_offset;
595 _deopt_mh_handler_begin = (address) this + deoptimize_mh_offset;
596
597 code_buffer->copy_code_and_locs_to(this);
598 code_buffer->copy_values_to(this);
599 if (ScavengeRootsInCode) {
600 if (detect_scavenge_root_oops()) {
601 CodeCache::add_scavenge_root_nmethod(this);
602 }
603 Universe::heap()->register_nmethod(this);
604 }
605 debug_only(verify_scavenge_root_oops());
606 CodeCache::commit(this);
607 }
608
609 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
610 ttyLocker ttyl; // keep the following output all in one block
611 // This output goes directly to the tty, not the compiler log.
612 // To enable tools to match it up with the compilation activity,
613 // be sure to tag this tty output with the compile ID.
614 if (xtty != NULL) {
615 xtty->begin_head("print_native_nmethod");
616 xtty->method(_method);
617 xtty->stamp();
618 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
619 }
620 // print the header part first
621 print();
622 // then print the requested information
623 if (PrintNativeNMethods) {
624 print_code();
625 if (oop_maps != NULL) {
626 oop_maps->print();
627 }
628 }
629 if (PrintRelocations) {
630 print_relocations();
631 }
632 if (xtty != NULL) {
633 xtty->tail("print_native_nmethod");
634 }
635 }
636 }
637
638 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () {
639 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level));
640 }
641
642 nmethod::nmethod(
643 Method* method,
644 CompilerType type,
645 int nmethod_size,
646 int compile_id,
647 int entry_bci,
648 CodeOffsets* offsets,
649 int orig_pc_offset,
650 DebugInformationRecorder* debug_info,
651 Dependencies* dependencies,
652 CodeBuffer *code_buffer,
653 int frame_size,
654 OopMapSet* oop_maps,
655 ExceptionHandlerTable* handler_table,
656 ImplicitExceptionTable* nul_chk_table,
657 AbstractCompiler* compiler,
658 int comp_level
659 #if INCLUDE_JVMCI
660 , Handle installed_code,
661 Handle speculation_log
662 #endif
663 )
664 : CompiledMethod(method, "nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false),
665 _native_receiver_sp_offset(in_ByteSize(-1)),
666 _native_basic_lock_sp_offset(in_ByteSize(-1))
667 {
668 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
669 {
670 debug_only(NoSafepointVerifier nsv;)
671 assert_locked_or_safepoint(CodeCache_lock);
672
673 _deopt_handler_begin = (address) this;
674 _deopt_mh_handler_begin = (address) this;
675
676 init_defaults();
677 _entry_bci = entry_bci;
678 _compile_id = compile_id;
679 _comp_level = comp_level;
680 _orig_pc_offset = orig_pc_offset;
681 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
682
683 // Section offsets
684 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts());
685 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs());
686 set_ctable_begin(header_begin() + _consts_offset);
687
688 #if INCLUDE_JVMCI
689 _jvmci_installed_code = installed_code();
690 _speculation_log = (instanceOop)speculation_log();
691
692 if (compiler->is_jvmci()) {
693 // JVMCI might not produce any stub sections
694 if (offsets->value(CodeOffsets::Exceptions) != -1) {
695 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions);
696 } else {
697 _exception_offset = -1;
698 }
699 if (offsets->value(CodeOffsets::Deopt) != -1) {
700 _deopt_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::Deopt);
701 } else {
702 _deopt_handler_begin = NULL;
703 }
704 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
705 _deopt_mh_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::DeoptMH);
706 } else {
707 _deopt_mh_handler_begin = NULL;
708 }
709 } else {
710 #endif
711 // Exception handler and deopt handler are in the stub section
712 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set");
713 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set");
714
715 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
716 _deopt_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::Deopt);
717 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
718 _deopt_mh_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::DeoptMH);
719 } else {
720 _deopt_mh_handler_begin = NULL;
721 #if INCLUDE_JVMCI
722 }
723 #endif
724 }
725 if (offsets->value(CodeOffsets::UnwindHandler) != -1) {
726 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler);
727 } else {
728 _unwind_handler_offset = -1;
729 }
730
731 _oops_offset = data_offset();
732 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize);
733 int scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize);
734
735 _scopes_pcs_offset = scopes_data_offset + round_to(debug_info->data_size (), oopSize);
736 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
737 _handler_table_offset = _dependencies_offset + round_to(dependencies->size_in_bytes (), oopSize);
738 _nul_chk_table_offset = _handler_table_offset + round_to(handler_table->size_in_bytes(), oopSize);
739 _nmethod_end_offset = _nul_chk_table_offset + round_to(nul_chk_table->size_in_bytes(), oopSize);
740 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
741 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
742 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry);
743 _exception_cache = NULL;
744
745 _scopes_data_begin = (address) this + scopes_data_offset;
746
747 _pc_desc_container.reset_to(scopes_pcs_begin());
748
749 code_buffer->copy_code_and_locs_to(this);
750 // Copy contents of ScopeDescRecorder to nmethod
751 code_buffer->copy_values_to(this);
752 debug_info->copy_to(this);
753 dependencies->copy_to(this);
754 if (ScavengeRootsInCode) {
755 if (detect_scavenge_root_oops()) {
756 CodeCache::add_scavenge_root_nmethod(this);
757 }
758 Universe::heap()->register_nmethod(this);
759 }
760 debug_only(verify_scavenge_root_oops());
761
762 CodeCache::commit(this);
763
764 // Copy contents of ExceptionHandlerTable to nmethod
765 handler_table->copy_to(this);
766 nul_chk_table->copy_to(this);
767
768 // we use the information of entry points to find out if a method is
769 // static or non static
770 assert(compiler->is_c2() || compiler->is_jvmci() ||
771 _method->is_static() == (entry_point() == _verified_entry_point),
772 " entry points must be same for static methods and vice versa");
773 }
774 }
775
776 // Print a short set of xml attributes to identify this nmethod. The
777 // output should be embedded in some other element.
778 void nmethod::log_identity(xmlStream* log) const {
779 log->print(" compile_id='%d'", compile_id());
780 const char* nm_kind = compile_kind();
781 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind);
782 log->print(" compiler='%s'", compiler_name());
783 if (TieredCompilation) {
784 log->print(" level='%d'", comp_level());
785 }
786 }
787
788
789 #define LOG_OFFSET(log, name) \
790 if (p2i(name##_end()) - p2i(name##_begin())) \
791 log->print(" " XSTR(name) "_offset='" INTX_FORMAT "'" , \
792 p2i(name##_begin()) - p2i(this))
793
794
795 void nmethod::log_new_nmethod() const {
796 if (LogCompilation && xtty != NULL) {
797 ttyLocker ttyl;
798 HandleMark hm;
799 xtty->begin_elem("nmethod");
800 log_identity(xtty);
801 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size());
802 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this));
803
804 LOG_OFFSET(xtty, relocation);
805 LOG_OFFSET(xtty, consts);
806 LOG_OFFSET(xtty, insts);
807 LOG_OFFSET(xtty, stub);
808 LOG_OFFSET(xtty, scopes_data);
809 LOG_OFFSET(xtty, scopes_pcs);
810 LOG_OFFSET(xtty, dependencies);
811 LOG_OFFSET(xtty, handler_table);
812 LOG_OFFSET(xtty, nul_chk_table);
813 LOG_OFFSET(xtty, oops);
814 LOG_OFFSET(xtty, metadata);
815
816 xtty->method(method());
817 xtty->stamp();
818 xtty->end_elem();
819 }
820 }
821
822 #undef LOG_OFFSET
823
824
825 // Print out more verbose output usually for a newly created nmethod.
826 void nmethod::print_on(outputStream* st, const char* msg) const {
827 if (st != NULL) {
828 ttyLocker ttyl;
829 if (WizardMode) {
830 CompileTask::print(st, this, msg, /*short_form:*/ true);
831 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this));
832 } else {
833 CompileTask::print(st, this, msg, /*short_form:*/ false);
834 }
835 }
836 }
837
838 void nmethod::maybe_print_nmethod(DirectiveSet* directive) {
839 bool printnmethods = directive->PrintAssemblyOption || directive->PrintNMethodsOption;
840 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
841 print_nmethod(printnmethods);
842 }
843 }
844
845 void nmethod::print_nmethod(bool printmethod) {
846 ttyLocker ttyl; // keep the following output all in one block
847 if (xtty != NULL) {
848 xtty->begin_head("print_nmethod");
849 xtty->stamp();
850 xtty->end_head();
851 }
852 // print the header part first
853 print();
854 // then print the requested information
855 if (printmethod) {
856 print_code();
857 print_pcs();
858 if (oop_maps()) {
859 oop_maps()->print();
860 }
861 }
862 if (printmethod || PrintDebugInfo || CompilerOracle::has_option_string(_method, "PrintDebugInfo")) {
863 print_scopes();
864 }
865 if (printmethod || PrintRelocations || CompilerOracle::has_option_string(_method, "PrintRelocations")) {
866 print_relocations();
867 }
868 if (printmethod || PrintDependencies || CompilerOracle::has_option_string(_method, "PrintDependencies")) {
869 print_dependencies();
870 }
871 if (printmethod || PrintExceptionHandlers) {
872 print_handler_table();
873 print_nul_chk_table();
874 }
875 if (printmethod) {
876 print_recorded_oops();
877 print_recorded_metadata();
878 }
879 if (xtty != NULL) {
880 xtty->tail("print_nmethod");
881 }
882 }
883
884
885 // Promote one word from an assembly-time handle to a live embedded oop.
886 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
887 if (handle == NULL ||
888 // As a special case, IC oops are initialized to 1 or -1.
889 handle == (jobject) Universe::non_oop_word()) {
890 (*dest) = (oop) handle;
891 } else {
892 (*dest) = JNIHandles::resolve_non_null(handle);
893 }
894 }
895
896
897 // Have to have the same name because it's called by a template
898 void nmethod::copy_values(GrowableArray<jobject>* array) {
899 int length = array->length();
900 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
901 oop* dest = oops_begin();
902 for (int index = 0 ; index < length; index++) {
903 initialize_immediate_oop(&dest[index], array->at(index));
904 }
905
906 // Now we can fix up all the oops in the code. We need to do this
907 // in the code because the assembler uses jobjects as placeholders.
908 // The code and relocations have already been initialized by the
909 // CodeBlob constructor, so it is valid even at this early point to
910 // iterate over relocations and patch the code.
911 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true);
912 }
913
914 void nmethod::copy_values(GrowableArray<Metadata*>* array) {
915 int length = array->length();
916 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough");
917 Metadata** dest = metadata_begin();
918 for (int index = 0 ; index < length; index++) {
919 dest[index] = array->at(index);
920 }
921 }
922
923 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) {
924 // re-patch all oop-bearing instructions, just in case some oops moved
925 RelocIterator iter(this, begin, end);
926 while (iter.next()) {
927 if (iter.type() == relocInfo::oop_type) {
928 oop_Relocation* reloc = iter.oop_reloc();
929 if (initialize_immediates && reloc->oop_is_immediate()) {
930 oop* dest = reloc->oop_addr();
931 initialize_immediate_oop(dest, (jobject) *dest);
932 }
933 // Refresh the oop-related bits of this instruction.
934 reloc->fix_oop_relocation();
935 } else if (iter.type() == relocInfo::metadata_type) {
936 metadata_Relocation* reloc = iter.metadata_reloc();
937 reloc->fix_metadata_relocation();
938 }
939 }
940 }
941
942
943 void nmethod::verify_clean_inline_caches() {
944 assert_locked_or_safepoint(CompiledIC_lock);
945
946 // If the method is not entrant or zombie then a JMP is plastered over the
947 // first few bytes. If an oop in the old code was there, that oop
948 // should not get GC'd. Skip the first few bytes of oops on
949 // not-entrant methods.
950 address low_boundary = verified_entry_point();
951 if (!is_in_use()) {
952 low_boundary += NativeJump::instruction_size;
953 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
954 // This means that the low_boundary is going to be a little too high.
955 // This shouldn't matter, since oops of non-entrant methods are never used.
956 // In fact, why are we bothering to look at oops in a non-entrant method??
957 }
958
959 ResourceMark rm;
960 RelocIterator iter(this, low_boundary);
961 while(iter.next()) {
962 switch(iter.type()) {
963 case relocInfo::virtual_call_type:
964 case relocInfo::opt_virtual_call_type: {
965 CompiledIC *ic = CompiledIC_at(&iter);
966 // Ok, to lookup references to zombies here
967 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
968 nmethod* nm = cb->as_nmethod_or_null();
969 if( nm != NULL ) {
970 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
971 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
972 assert(ic->is_clean(), "IC should be clean");
973 }
974 }
975 break;
976 }
977 case relocInfo::static_call_type: {
978 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
979 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
980 nmethod* nm = cb->as_nmethod_or_null();
981 if( nm != NULL ) {
982 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
983 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
984 assert(csc->is_clean(), "IC should be clean");
985 }
986 }
987 break;
988 }
989 }
990 }
991 }
992
993 // This is a private interface with the sweeper.
994 void nmethod::mark_as_seen_on_stack() {
995 assert(is_alive(), "Must be an alive method");
996 // Set the traversal mark to ensure that the sweeper does 2
997 // cleaning passes before moving to zombie.
998 set_stack_traversal_mark(NMethodSweeper::traversal_count());
999 }
1000
1001 // Tell if a non-entrant method can be converted to a zombie (i.e.,
1002 // there are no activations on the stack, not in use by the VM,
1003 // and not in use by the ServiceThread)
1004 bool nmethod::can_convert_to_zombie() {
1005 assert(is_not_entrant(), "must be a non-entrant method");
1006
1007 // Since the nmethod sweeper only does partial sweep the sweeper's traversal
1008 // count can be greater than the stack traversal count before it hits the
1009 // nmethod for the second time.
1010 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count() &&
1011 !is_locked_by_vm();
1012 }
1013
1014 void nmethod::inc_decompile_count() {
1015 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return;
1016 // Could be gated by ProfileTraps, but do not bother...
1017 Method* m = method();
1018 if (m == NULL) return;
1019 MethodData* mdo = m->method_data();
1020 if (mdo == NULL) return;
1021 // There is a benign race here. See comments in methodData.hpp.
1022 mdo->inc_decompile_count();
1023 }
1024
1025 void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) {
1026
1027 post_compiled_method_unload();
1028
1029 // Since this nmethod is being unloaded, make sure that dependencies
1030 // recorded in instanceKlasses get flushed and pass non-NULL closure to
1031 // indicate that this work is being done during a GC.
1032 assert(Universe::heap()->is_gc_active(), "should only be called during gc");
1033 assert(is_alive != NULL, "Should be non-NULL");
1034 // A non-NULL is_alive closure indicates that this is being called during GC.
1035 flush_dependencies(is_alive);
1036
1037 // Break cycle between nmethod & method
1038 if (log_is_enabled(Trace, class, unload)) {
1039 outputStream* log = Log(class, unload)::trace_stream();
1040 log->print_cr("making nmethod " INTPTR_FORMAT
1041 " unloadable, Method*(" INTPTR_FORMAT
1042 "), cause(" INTPTR_FORMAT ")",
1043 p2i(this), p2i(_method), p2i(cause));
1044 if (!Universe::heap()->is_gc_active())
1045 cause->klass()->print_on(log);
1046 }
1047 // Unlink the osr method, so we do not look this up again
1048 if (is_osr_method()) {
1049 // Invalidate the osr nmethod only once
1050 if (is_in_use()) {
1051 invalidate_osr_method();
1052 }
1053 #ifdef ASSERT
1054 if (method() != NULL) {
1055 // Make sure osr nmethod is invalidated, i.e. not on the list
1056 bool found = method()->method_holder()->remove_osr_nmethod(this);
1057 assert(!found, "osr nmethod should have been invalidated");
1058 }
1059 #endif
1060 }
1061
1062 // If _method is already NULL the Method* is about to be unloaded,
1063 // so we don't have to break the cycle. Note that it is possible to
1064 // have the Method* live here, in case we unload the nmethod because
1065 // it is pointing to some oop (other than the Method*) being unloaded.
1066 if (_method != NULL) {
1067 // OSR methods point to the Method*, but the Method* does not
1068 // point back!
1069 if (_method->code() == this) {
1070 _method->clear_code(); // Break a cycle
1071 }
1072 _method = NULL; // Clear the method of this dead nmethod
1073 }
1074
1075 // Make the class unloaded - i.e., change state and notify sweeper
1076 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
1077 if (is_in_use()) {
1078 // Transitioning directly from live to unloaded -- so
1079 // we need to force a cache clean-up; remember this
1080 // for later on.
1081 CodeCache::set_needs_cache_clean(true);
1082 }
1083
1084 // Unregister must be done before the state change
1085 Universe::heap()->unregister_nmethod(this);
1086
1087 _state = unloaded;
1088
1089 // Log the unloading.
1090 log_state_change();
1091
1092 #if INCLUDE_JVMCI
1093 // The method can only be unloaded after the pointer to the installed code
1094 // Java wrapper is no longer alive. Here we need to clear out this weak
1095 // reference to the dead object. Nulling out the reference has to happen
1096 // after the method is unregistered since the original value may be still
1097 // tracked by the rset.
1098 maybe_invalidate_installed_code();
1099 // Clear these out after the nmethod has been unregistered and any
1100 // updates to the InstalledCode instance have been performed.
1101 _jvmci_installed_code = NULL;
1102 _speculation_log = NULL;
1103 #endif
1104
1105 // The Method* is gone at this point
1106 assert(_method == NULL, "Tautology");
1107
1108 set_osr_link(NULL);
1109 NMethodSweeper::report_state_change(this);
1110 }
1111
1112 void nmethod::invalidate_osr_method() {
1113 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
1114 // Remove from list of active nmethods
1115 if (method() != NULL) {
1116 method()->method_holder()->remove_osr_nmethod(this);
1117 }
1118 }
1119
1120 void nmethod::log_state_change() const {
1121 if (LogCompilation) {
1122 if (xtty != NULL) {
1123 ttyLocker ttyl; // keep the following output all in one block
1124 if (_state == unloaded) {
1125 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'",
1126 os::current_thread_id());
1127 } else {
1128 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s",
1129 os::current_thread_id(),
1130 (_state == zombie ? " zombie='1'" : ""));
1131 }
1132 log_identity(xtty);
1133 xtty->stamp();
1134 xtty->end_elem();
1135 }
1136 }
1137
1138 const char *state_msg = _state == zombie ? "made zombie" : "made not entrant";
1139 CompileTask::print_ul(this, state_msg);
1140 if (PrintCompilation && _state != unloaded) {
1141 print_on(tty, state_msg);
1142 }
1143 }
1144
1145 /**
1146 * Common functionality for both make_not_entrant and make_zombie
1147 */
1148 bool nmethod::make_not_entrant_or_zombie(unsigned int state) {
1149 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant");
1150 assert(!is_zombie(), "should not already be a zombie");
1151
1152 if (_state == state) {
1153 // Avoid taking the lock if already in required state.
1154 // This is safe from races because the state is an end-state,
1155 // which the nmethod cannot back out of once entered.
1156 // No need for fencing either.
1157 return false;
1158 }
1159
1160 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below.
1161 nmethodLocker nml(this);
1162 methodHandle the_method(method());
1163 NoSafepointVerifier nsv;
1164
1165 // during patching, depending on the nmethod state we must notify the GC that
1166 // code has been unloaded, unregistering it. We cannot do this right while
1167 // holding the Patching_lock because we need to use the CodeCache_lock. This
1168 // would be prone to deadlocks.
1169 // This flag is used to remember whether we need to later lock and unregister.
1170 bool nmethod_needs_unregister = false;
1171
1172 {
1173 // invalidate osr nmethod before acquiring the patching lock since
1174 // they both acquire leaf locks and we don't want a deadlock.
1175 // This logic is equivalent to the logic below for patching the
1176 // verified entry point of regular methods. We check that the
1177 // nmethod is in use to ensure that it is invalidated only once.
1178 if (is_osr_method() && is_in_use()) {
1179 // this effectively makes the osr nmethod not entrant
1180 invalidate_osr_method();
1181 }
1182
1183 // Enter critical section. Does not block for safepoint.
1184 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1185
1186 if (_state == state) {
1187 // another thread already performed this transition so nothing
1188 // to do, but return false to indicate this.
1189 return false;
1190 }
1191
1192 // The caller can be calling the method statically or through an inline
1193 // cache call.
1194 if (!is_osr_method() && !is_not_entrant()) {
1195 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
1196 SharedRuntime::get_handle_wrong_method_stub());
1197 }
1198
1199 if (is_in_use() && update_recompile_counts()) {
1200 // It's a true state change, so mark the method as decompiled.
1201 // Do it only for transition from alive.
1202 inc_decompile_count();
1203 }
1204
1205 // If the state is becoming a zombie, signal to unregister the nmethod with
1206 // the heap.
1207 // This nmethod may have already been unloaded during a full GC.
1208 if ((state == zombie) && !is_unloaded()) {
1209 nmethod_needs_unregister = true;
1210 }
1211
1212 // Must happen before state change. Otherwise we have a race condition in
1213 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately
1214 // transition its state from 'not_entrant' to 'zombie' without having to wait
1215 // for stack scanning.
1216 if (state == not_entrant) {
1217 mark_as_seen_on_stack();
1218 OrderAccess::storestore();
1219 }
1220
1221 // Change state
1222 _state = state;
1223
1224 // Log the transition once
1225 log_state_change();
1226
1227 // Invalidate while holding the patching lock
1228 JVMCI_ONLY(maybe_invalidate_installed_code());
1229
1230 // Remove nmethod from method.
1231 // We need to check if both the _code and _from_compiled_code_entry_point
1232 // refer to this nmethod because there is a race in setting these two fields
1233 // in Method* as seen in bugid 4947125.
1234 // If the vep() points to the zombie nmethod, the memory for the nmethod
1235 // could be flushed and the compiler and vtable stubs could still call
1236 // through it.
1237 if (method() != NULL && (method()->code() == this ||
1238 method()->from_compiled_entry() == verified_entry_point())) {
1239 HandleMark hm;
1240 method()->clear_code(false /* already owns Patching_lock */);
1241 }
1242 } // leave critical region under Patching_lock
1243
1244 #ifdef ASSERT
1245 if (is_osr_method() && method() != NULL) {
1246 // Make sure osr nmethod is invalidated, i.e. not on the list
1247 bool found = method()->method_holder()->remove_osr_nmethod(this);
1248 assert(!found, "osr nmethod should have been invalidated");
1249 }
1250 #endif
1251
1252 // When the nmethod becomes zombie it is no longer alive so the
1253 // dependencies must be flushed. nmethods in the not_entrant
1254 // state will be flushed later when the transition to zombie
1255 // happens or they get unloaded.
1256 if (state == zombie) {
1257 {
1258 // Flushing dependencies must be done before any possible
1259 // safepoint can sneak in, otherwise the oops used by the
1260 // dependency logic could have become stale.
1261 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1262 if (nmethod_needs_unregister) {
1263 Universe::heap()->unregister_nmethod(this);
1264 #ifdef JVMCI
1265 _jvmci_installed_code = NULL;
1266 _speculation_log = NULL;
1267 #endif
1268 }
1269 flush_dependencies(NULL);
1270 }
1271
1272 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload
1273 // event and it hasn't already been reported for this nmethod then
1274 // report it now. The event may have been reported earlier if the GC
1275 // marked it for unloading). JvmtiDeferredEventQueue support means
1276 // we no longer go to a safepoint here.
1277 post_compiled_method_unload();
1278
1279 #ifdef ASSERT
1280 // It's no longer safe to access the oops section since zombie
1281 // nmethods aren't scanned for GC.
1282 _oops_are_stale = true;
1283 #endif
1284 // the Method may be reclaimed by class unloading now that the
1285 // nmethod is in zombie state
1286 set_method(NULL);
1287 } else {
1288 assert(state == not_entrant, "other cases may need to be handled differently");
1289 }
1290
1291 if (TraceCreateZombies) {
1292 ResourceMark m;
1293 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");
1294 }
1295
1296 NMethodSweeper::report_state_change(this);
1297 return true;
1298 }
1299
1300 void nmethod::flush() {
1301 // Note that there are no valid oops in the nmethod anymore.
1302 assert(!is_osr_method() || is_unloaded() || is_zombie(),
1303 "osr nmethod must be unloaded or zombie before flushing");
1304 assert(is_zombie() || is_osr_method(), "must be a zombie method");
1305 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed");
1306 assert_locked_or_safepoint(CodeCache_lock);
1307
1308 // completely deallocate this method
1309 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, p2i(this));
1310 if (PrintMethodFlushing) {
1311 tty->print_cr("*flushing %s nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT
1312 "/Free CodeCache:" SIZE_FORMAT "Kb",
1313 is_osr_method() ? "osr" : "",_compile_id, p2i(this), CodeCache::blob_count(),
1314 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024);
1315 }
1316
1317 // We need to deallocate any ExceptionCache data.
1318 // Note that we do not need to grab the nmethod lock for this, it
1319 // better be thread safe if we're disposing of it!
1320 ExceptionCache* ec = exception_cache();
1321 set_exception_cache(NULL);
1322 while(ec != NULL) {
1323 ExceptionCache* next = ec->next();
1324 delete ec;
1325 ec = next;
1326 }
1327
1328 if (on_scavenge_root_list()) {
1329 CodeCache::drop_scavenge_root_nmethod(this);
1330 }
1331
1332 #ifdef SHARK
1333 ((SharkCompiler *) compiler())->free_compiled_method(insts_begin());
1334 #endif // SHARK
1335
1336 CodeBlob::flush();
1337 CodeCache::free(this);
1338 }
1339
1340 //
1341 // Notify all classes this nmethod is dependent on that it is no
1342 // longer dependent. This should only be called in two situations.
1343 // First, when a nmethod transitions to a zombie all dependents need
1344 // to be clear. Since zombification happens at a safepoint there's no
1345 // synchronization issues. The second place is a little more tricky.
1346 // During phase 1 of mark sweep class unloading may happen and as a
1347 // result some nmethods may get unloaded. In this case the flushing
1348 // of dependencies must happen during phase 1 since after GC any
1349 // dependencies in the unloaded nmethod won't be updated, so
1350 // traversing the dependency information in unsafe. In that case this
1351 // function is called with a non-NULL argument and this function only
1352 // notifies instanceKlasses that are reachable
1353
1354 void nmethod::flush_dependencies(BoolObjectClosure* is_alive) {
1355 assert_locked_or_safepoint(CodeCache_lock);
1356 assert(Universe::heap()->is_gc_active() == (is_alive != NULL),
1357 "is_alive is non-NULL if and only if we are called during GC");
1358 if (!has_flushed_dependencies()) {
1359 set_has_flushed_dependencies();
1360 for (Dependencies::DepStream deps(this); deps.next(); ) {
1361 if (deps.type() == Dependencies::call_site_target_value) {
1362 // CallSite dependencies are managed on per-CallSite instance basis.
1363 oop call_site = deps.argument_oop(0);
1364 MethodHandles::remove_dependent_nmethod(call_site, this);
1365 } else {
1366 Klass* klass = deps.context_type();
1367 if (klass == NULL) {
1368 continue; // ignore things like evol_method
1369 }
1370 // During GC the is_alive closure is non-NULL, and is used to
1371 // determine liveness of dependees that need to be updated.
1372 if (is_alive == NULL || klass->is_loader_alive(is_alive)) {
1373 // The GC defers deletion of this entry, since there might be multiple threads
1374 // iterating over the _dependencies graph. Other call paths are single-threaded
1375 // and may delete it immediately.
1376 bool delete_immediately = is_alive == NULL;
1377 InstanceKlass::cast(klass)->remove_dependent_nmethod(this, delete_immediately);
1378 }
1379 }
1380 }
1381 }
1382 }
1383
1384
1385 // If this oop is not live, the nmethod can be unloaded.
1386 bool nmethod::can_unload(BoolObjectClosure* is_alive, oop* root, bool unloading_occurred) {
1387 assert(root != NULL, "just checking");
1388 oop obj = *root;
1389 if (obj == NULL || is_alive->do_object_b(obj)) {
1390 return false;
1391 }
1392
1393 // If ScavengeRootsInCode is true, an nmethod might be unloaded
1394 // simply because one of its constant oops has gone dead.
1395 // No actual classes need to be unloaded in order for this to occur.
1396 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading");
1397 make_unloaded(is_alive, obj);
1398 return true;
1399 }
1400
1401 // ------------------------------------------------------------------
1402 // post_compiled_method_load_event
1403 // new method for install_code() path
1404 // Transfer information from compilation to jvmti
1405 void nmethod::post_compiled_method_load_event() {
1406
1407 Method* moop = method();
1408 HOTSPOT_COMPILED_METHOD_LOAD(
1409 (char *) moop->klass_name()->bytes(),
1410 moop->klass_name()->utf8_length(),
1411 (char *) moop->name()->bytes(),
1412 moop->name()->utf8_length(),
1413 (char *) moop->signature()->bytes(),
1414 moop->signature()->utf8_length(),
1415 insts_begin(), insts_size());
1416
1417 if (JvmtiExport::should_post_compiled_method_load() ||
1418 JvmtiExport::should_post_compiled_method_unload()) {
1419 get_and_cache_jmethod_id();
1420 }
1421
1422 if (JvmtiExport::should_post_compiled_method_load()) {
1423 // Let the Service thread (which is a real Java thread) post the event
1424 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1425 JvmtiDeferredEventQueue::enqueue(
1426 JvmtiDeferredEvent::compiled_method_load_event(this));
1427 }
1428 }
1429
1430 jmethodID nmethod::get_and_cache_jmethod_id() {
1431 if (_jmethod_id == NULL) {
1432 // Cache the jmethod_id since it can no longer be looked up once the
1433 // method itself has been marked for unloading.
1434 _jmethod_id = method()->jmethod_id();
1435 }
1436 return _jmethod_id;
1437 }
1438
1439 void nmethod::post_compiled_method_unload() {
1440 if (unload_reported()) {
1441 // During unloading we transition to unloaded and then to zombie
1442 // and the unloading is reported during the first transition.
1443 return;
1444 }
1445
1446 assert(_method != NULL && !is_unloaded(), "just checking");
1447 DTRACE_METHOD_UNLOAD_PROBE(method());
1448
1449 // If a JVMTI agent has enabled the CompiledMethodUnload event then
1450 // post the event. Sometime later this nmethod will be made a zombie
1451 // by the sweeper but the Method* will not be valid at that point.
1452 // If the _jmethod_id is null then no load event was ever requested
1453 // so don't bother posting the unload. The main reason for this is
1454 // that the jmethodID is a weak reference to the Method* so if
1455 // it's being unloaded there's no way to look it up since the weak
1456 // ref will have been cleared.
1457 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) {
1458 assert(!unload_reported(), "already unloaded");
1459 JvmtiDeferredEvent event =
1460 JvmtiDeferredEvent::compiled_method_unload_event(this,
1461 _jmethod_id, insts_begin());
1462 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1463 JvmtiDeferredEventQueue::enqueue(event);
1464 }
1465
1466 // The JVMTI CompiledMethodUnload event can be enabled or disabled at
1467 // any time. As the nmethod is being unloaded now we mark it has
1468 // having the unload event reported - this will ensure that we don't
1469 // attempt to report the event in the unlikely scenario where the
1470 // event is enabled at the time the nmethod is made a zombie.
1471 set_unload_reported();
1472 }
1473
1474 bool nmethod::unload_if_dead_at(RelocIterator* iter_at_oop, BoolObjectClosure *is_alive, bool unloading_occurred) {
1475 assert(iter_at_oop->type() == relocInfo::oop_type, "Wrong relocation type");
1476
1477 oop_Relocation* r = iter_at_oop->oop_reloc();
1478 // Traverse those oops directly embedded in the code.
1479 // Other oops (oop_index>0) are seen as part of scopes_oops.
1480 assert(1 == (r->oop_is_immediate()) +
1481 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1482 "oop must be found in exactly one place");
1483 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1484 // Unload this nmethod if the oop is dead.
1485 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) {
1486 return true;;
1487 }
1488 }
1489
1490 return false;
1491 }
1492
1493 bool nmethod::do_unloading_scopes(BoolObjectClosure* is_alive, bool unloading_occurred) {
1494 // Scopes
1495 for (oop* p = oops_begin(); p < oops_end(); p++) {
1496 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1497 if (can_unload(is_alive, p, unloading_occurred)) {
1498 return true;
1499 }
1500 }
1501 return false;
1502 }
1503
1504 bool nmethod::do_unloading_oops(address low_boundary, BoolObjectClosure* is_alive, bool unloading_occurred) {
1505 // Compiled code
1506 {
1507 RelocIterator iter(this, low_boundary);
1508 while (iter.next()) {
1509 if (iter.type() == relocInfo::oop_type) {
1510 if (unload_if_dead_at(&iter, is_alive, unloading_occurred)) {
1511 return true;
1512 }
1513 }
1514 }
1515 }
1516
1517 return do_unloading_scopes(is_alive, unloading_occurred);
1518 }
1519
1520 #if INCLUDE_JVMCI
1521 bool nmethod::do_unloading_jvmci(BoolObjectClosure* is_alive, bool unloading_occurred) {
1522 bool is_unloaded = false;
1523 // Follow JVMCI method
1524 BarrierSet* bs = Universe::heap()->barrier_set();
1525 if (_jvmci_installed_code != NULL) {
1526 if (_jvmci_installed_code->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(_jvmci_installed_code)) {
1527 if (!is_alive->do_object_b(_jvmci_installed_code)) {
1528 clear_jvmci_installed_code();
1529 }
1530 } else {
1531 if (can_unload(is_alive, (oop*)&_jvmci_installed_code, unloading_occurred)) {
1532 return true;
1533 }
1534 }
1535 }
1536
1537 if (_speculation_log != NULL) {
1538 if (!is_alive->do_object_b(_speculation_log)) {
1539 bs->write_ref_nmethod_pre(&_speculation_log, this);
1540 _speculation_log = NULL;
1541 bs->write_ref_nmethod_post(&_speculation_log, this);
1542 }
1543 }
1544 return is_unloaded;
1545 }
1546 #endif
1547
1548 // Iterate over metadata calling this function. Used by RedefineClasses
1549 void nmethod::metadata_do(void f(Metadata*)) {
1550 address low_boundary = verified_entry_point();
1551 if (is_not_entrant()) {
1552 low_boundary += NativeJump::instruction_size;
1553 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1554 // (See comment above.)
1555 }
1556 {
1557 // Visit all immediate references that are embedded in the instruction stream.
1558 RelocIterator iter(this, low_boundary);
1559 while (iter.next()) {
1560 if (iter.type() == relocInfo::metadata_type ) {
1561 metadata_Relocation* r = iter.metadata_reloc();
1562 // In this metadata, we must only follow those metadatas directly embedded in
1563 // the code. Other metadatas (oop_index>0) are seen as part of
1564 // the metadata section below.
1565 assert(1 == (r->metadata_is_immediate()) +
1566 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
1567 "metadata must be found in exactly one place");
1568 if (r->metadata_is_immediate() && r->metadata_value() != NULL) {
1569 Metadata* md = r->metadata_value();
1570 if (md != _method) f(md);
1571 }
1572 } else if (iter.type() == relocInfo::virtual_call_type) {
1573 // Check compiledIC holders associated with this nmethod
1574 CompiledIC *ic = CompiledIC_at(&iter);
1575 if (ic->is_icholder_call()) {
1576 CompiledICHolder* cichk = ic->cached_icholder();
1577 f(cichk->holder_method());
1578 f(cichk->holder_klass());
1579 } else {
1580 Metadata* ic_oop = ic->cached_metadata();
1581 if (ic_oop != NULL) {
1582 f(ic_oop);
1583 }
1584 }
1585 }
1586 }
1587 }
1588
1589 // Visit the metadata section
1590 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
1591 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops
1592 Metadata* md = *p;
1593 f(md);
1594 }
1595
1596 // Visit metadata not embedded in the other places.
1597 if (_method != NULL) f(_method);
1598 }
1599
1600 void nmethod::oops_do(OopClosure* f, bool allow_zombie) {
1601 // make sure the oops ready to receive visitors
1602 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod");
1603 assert(!is_unloaded(), "should not call follow on unloaded nmethod");
1604
1605 // If the method is not entrant or zombie then a JMP is plastered over the
1606 // first few bytes. If an oop in the old code was there, that oop
1607 // should not get GC'd. Skip the first few bytes of oops on
1608 // not-entrant methods.
1609 address low_boundary = verified_entry_point();
1610 if (is_not_entrant()) {
1611 low_boundary += NativeJump::instruction_size;
1612 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1613 // (See comment above.)
1614 }
1615
1616 #if INCLUDE_JVMCI
1617 if (_jvmci_installed_code != NULL) {
1618 f->do_oop((oop*) &_jvmci_installed_code);
1619 }
1620 if (_speculation_log != NULL) {
1621 f->do_oop((oop*) &_speculation_log);
1622 }
1623 #endif
1624
1625 RelocIterator iter(this, low_boundary);
1626
1627 while (iter.next()) {
1628 if (iter.type() == relocInfo::oop_type ) {
1629 oop_Relocation* r = iter.oop_reloc();
1630 // In this loop, we must only follow those oops directly embedded in
1631 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1632 assert(1 == (r->oop_is_immediate()) +
1633 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1634 "oop must be found in exactly one place");
1635 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1636 f->do_oop(r->oop_addr());
1637 }
1638 }
1639 }
1640
1641 // Scopes
1642 // This includes oop constants not inlined in the code stream.
1643 for (oop* p = oops_begin(); p < oops_end(); p++) {
1644 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1645 f->do_oop(p);
1646 }
1647 }
1648
1649 #define NMETHOD_SENTINEL ((nmethod*)badAddress)
1650
1651 nmethod* volatile nmethod::_oops_do_mark_nmethods;
1652
1653 // An nmethod is "marked" if its _mark_link is set non-null.
1654 // Even if it is the end of the linked list, it will have a non-null link value,
1655 // as long as it is on the list.
1656 // This code must be MP safe, because it is used from parallel GC passes.
1657 bool nmethod::test_set_oops_do_mark() {
1658 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");
1659 nmethod* observed_mark_link = _oops_do_mark_link;
1660 if (observed_mark_link == NULL) {
1661 // Claim this nmethod for this thread to mark.
1662 observed_mark_link = (nmethod*)
1663 Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_link, NULL);
1664 if (observed_mark_link == NULL) {
1665
1666 // Atomically append this nmethod (now claimed) to the head of the list:
1667 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods;
1668 for (;;) {
1669 nmethod* required_mark_nmethods = observed_mark_nmethods;
1670 _oops_do_mark_link = required_mark_nmethods;
1671 observed_mark_nmethods = (nmethod*)
1672 Atomic::cmpxchg_ptr(this, &_oops_do_mark_nmethods, required_mark_nmethods);
1673 if (observed_mark_nmethods == required_mark_nmethods)
1674 break;
1675 }
1676 // Mark was clear when we first saw this guy.
1677 if (TraceScavenge) { print_on(tty, "oops_do, mark"); }
1678 return false;
1679 }
1680 }
1681 // On fall through, another racing thread marked this nmethod before we did.
1682 return true;
1683 }
1684
1685 void nmethod::oops_do_marking_prologue() {
1686 if (TraceScavenge) { tty->print_cr("[oops_do_marking_prologue"); }
1687 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row");
1688 // We use cmpxchg_ptr instead of regular assignment here because the user
1689 // may fork a bunch of threads, and we need them all to see the same state.
1690 void* observed = Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, NULL);
1691 guarantee(observed == NULL, "no races in this sequential code");
1692 }
1693
1694 void nmethod::oops_do_marking_epilogue() {
1695 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row");
1696 nmethod* cur = _oops_do_mark_nmethods;
1697 while (cur != NMETHOD_SENTINEL) {
1698 assert(cur != NULL, "not NULL-terminated");
1699 nmethod* next = cur->_oops_do_mark_link;
1700 cur->_oops_do_mark_link = NULL;
1701 DEBUG_ONLY(cur->verify_oop_relocations());
1702 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark"));
1703 cur = next;
1704 }
1705 void* required = _oops_do_mark_nmethods;
1706 void* observed = Atomic::cmpxchg_ptr(NULL, &_oops_do_mark_nmethods, required);
1707 guarantee(observed == required, "no races in this sequential code");
1708 if (TraceScavenge) { tty->print_cr("oops_do_marking_epilogue]"); }
1709 }
1710
1711 class DetectScavengeRoot: public OopClosure {
1712 bool _detected_scavenge_root;
1713 public:
1714 DetectScavengeRoot() : _detected_scavenge_root(false)
1715 { NOT_PRODUCT(_print_nm = NULL); }
1716 bool detected_scavenge_root() { return _detected_scavenge_root; }
1717 virtual void do_oop(oop* p) {
1718 if ((*p) != NULL && (*p)->is_scavengable()) {
1719 NOT_PRODUCT(maybe_print(p));
1720 _detected_scavenge_root = true;
1721 }
1722 }
1723 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
1724
1725 #ifndef PRODUCT
1726 nmethod* _print_nm;
1727 void maybe_print(oop* p) {
1728 if (_print_nm == NULL) return;
1729 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root");
1730 tty->print_cr("" PTR_FORMAT "[offset=%d] detected scavengable oop " PTR_FORMAT " (found at " PTR_FORMAT ")",
1731 p2i(_print_nm), (int)((intptr_t)p - (intptr_t)_print_nm),
1732 p2i(*p), p2i(p));
1733 (*p)->print();
1734 }
1735 #endif //PRODUCT
1736 };
1737
1738 bool nmethod::detect_scavenge_root_oops() {
1739 DetectScavengeRoot detect_scavenge_root;
1740 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this);
1741 oops_do(&detect_scavenge_root);
1742 return detect_scavenge_root.detected_scavenge_root();
1743 }
1744
1745 inline bool includes(void* p, void* from, void* to) {
1746 return from <= p && p < to;
1747 }
1748
1749
1750 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
1751 assert(count >= 2, "must be sentinel values, at least");
1752
1753 #ifdef ASSERT
1754 // must be sorted and unique; we do a binary search in find_pc_desc()
1755 int prev_offset = pcs[0].pc_offset();
1756 assert(prev_offset == PcDesc::lower_offset_limit,
1757 "must start with a sentinel");
1758 for (int i = 1; i < count; i++) {
1759 int this_offset = pcs[i].pc_offset();
1760 assert(this_offset > prev_offset, "offsets must be sorted");
1761 prev_offset = this_offset;
1762 }
1763 assert(prev_offset == PcDesc::upper_offset_limit,
1764 "must end with a sentinel");
1765 #endif //ASSERT
1766
1767 // Search for MethodHandle invokes and tag the nmethod.
1768 for (int i = 0; i < count; i++) {
1769 if (pcs[i].is_method_handle_invoke()) {
1770 set_has_method_handle_invokes(true);
1771 break;
1772 }
1773 }
1774 assert(has_method_handle_invokes() == (_deopt_mh_handler_begin != NULL), "must have deopt mh handler");
1775
1776 int size = count * sizeof(PcDesc);
1777 assert(scopes_pcs_size() >= size, "oob");
1778 memcpy(scopes_pcs_begin(), pcs, size);
1779
1780 // Adjust the final sentinel downward.
1781 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
1782 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
1783 last_pc->set_pc_offset(content_size() + 1);
1784 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
1785 // Fill any rounding gaps with copies of the last record.
1786 last_pc[1] = last_pc[0];
1787 }
1788 // The following assert could fail if sizeof(PcDesc) is not
1789 // an integral multiple of oopSize (the rounding term).
1790 // If it fails, change the logic to always allocate a multiple
1791 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
1792 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
1793 }
1794
1795 void nmethod::copy_scopes_data(u_char* buffer, int size) {
1796 assert(scopes_data_size() >= size, "oob");
1797 memcpy(scopes_data_begin(), buffer, size);
1798 }
1799
1800 #ifdef ASSERT
1801 static PcDesc* linear_search(const PcDescSearch& search, int pc_offset, bool approximate) {
1802 PcDesc* lower = search.scopes_pcs_begin();
1803 PcDesc* upper = search.scopes_pcs_end();
1804 lower += 1; // exclude initial sentinel
1805 PcDesc* res = NULL;
1806 for (PcDesc* p = lower; p < upper; p++) {
1807 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc
1808 if (match_desc(p, pc_offset, approximate)) {
1809 if (res == NULL)
1810 res = p;
1811 else
1812 res = (PcDesc*) badAddress;
1813 }
1814 }
1815 return res;
1816 }
1817 #endif
1818
1819
1820 // Finds a PcDesc with real-pc equal to "pc"
1821 PcDesc* PcDescContainer::find_pc_desc_internal(address pc, bool approximate, const PcDescSearch& search) {
1822 address base_address = search.code_begin();
1823 if ((pc < base_address) ||
1824 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
1825 return NULL; // PC is wildly out of range
1826 }
1827 int pc_offset = (int) (pc - base_address);
1828
1829 // Check the PcDesc cache if it contains the desired PcDesc
1830 // (This as an almost 100% hit rate.)
1831 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
1832 if (res != NULL) {
1833 assert(res == linear_search(search, pc_offset, approximate), "cache ok");
1834 return res;
1835 }
1836
1837 // Fallback algorithm: quasi-linear search for the PcDesc
1838 // Find the last pc_offset less than the given offset.
1839 // The successor must be the required match, if there is a match at all.
1840 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
1841 PcDesc* lower = search.scopes_pcs_begin();
1842 PcDesc* upper = search.scopes_pcs_end();
1843 upper -= 1; // exclude final sentinel
1844 if (lower >= upper) return NULL; // native method; no PcDescs at all
1845
1846 #define assert_LU_OK \
1847 /* invariant on lower..upper during the following search: */ \
1848 assert(lower->pc_offset() < pc_offset, "sanity"); \
1849 assert(upper->pc_offset() >= pc_offset, "sanity")
1850 assert_LU_OK;
1851
1852 // Use the last successful return as a split point.
1853 PcDesc* mid = _pc_desc_cache.last_pc_desc();
1854 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1855 if (mid->pc_offset() < pc_offset) {
1856 lower = mid;
1857 } else {
1858 upper = mid;
1859 }
1860
1861 // Take giant steps at first (4096, then 256, then 16, then 1)
1862 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
1863 const int RADIX = (1 << LOG2_RADIX);
1864 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
1865 while ((mid = lower + step) < upper) {
1866 assert_LU_OK;
1867 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1868 if (mid->pc_offset() < pc_offset) {
1869 lower = mid;
1870 } else {
1871 upper = mid;
1872 break;
1873 }
1874 }
1875 assert_LU_OK;
1876 }
1877
1878 // Sneak up on the value with a linear search of length ~16.
1879 while (true) {
1880 assert_LU_OK;
1881 mid = lower + 1;
1882 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1883 if (mid->pc_offset() < pc_offset) {
1884 lower = mid;
1885 } else {
1886 upper = mid;
1887 break;
1888 }
1889 }
1890 #undef assert_LU_OK
1891
1892 if (match_desc(upper, pc_offset, approximate)) {
1893 assert(upper == linear_search(search, pc_offset, approximate), "search ok");
1894 _pc_desc_cache.add_pc_desc(upper);
1895 return upper;
1896 } else {
1897 assert(NULL == linear_search(search, pc_offset, approximate), "search ok");
1898 return NULL;
1899 }
1900 }
1901
1902
1903 void nmethod::check_all_dependencies(DepChange& changes) {
1904 // Checked dependencies are allocated into this ResourceMark
1905 ResourceMark rm;
1906
1907 // Turn off dependency tracing while actually testing dependencies.
1908 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) );
1909
1910 typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash,
1911 &DependencySignature::equals, 11027> DepTable;
1912
1913 DepTable* table = new DepTable();
1914
1915 // Iterate over live nmethods and check dependencies of all nmethods that are not
1916 // marked for deoptimization. A particular dependency is only checked once.
1917 NMethodIterator iter;
1918 while(iter.next()) {
1919 nmethod* nm = iter.method();
1920 // Only notify for live nmethods
1921 if (nm->is_alive() && !nm->is_marked_for_deoptimization()) {
1922 for (Dependencies::DepStream deps(nm); deps.next(); ) {
1923 // Construct abstraction of a dependency.
1924 DependencySignature* current_sig = new DependencySignature(deps);
1925
1926 // Determine if dependency is already checked. table->put(...) returns
1927 // 'true' if the dependency is added (i.e., was not in the hashtable).
1928 if (table->put(*current_sig, 1)) {
1929 if (deps.check_dependency() != NULL) {
1930 // Dependency checking failed. Print out information about the failed
1931 // dependency and finally fail with an assert. We can fail here, since
1932 // dependency checking is never done in a product build.
1933 tty->print_cr("Failed dependency:");
1934 changes.print();
1935 nm->print();
1936 nm->print_dependencies();
1937 assert(false, "Should have been marked for deoptimization");
1938 }
1939 }
1940 }
1941 }
1942 }
1943 }
1944
1945 bool nmethod::check_dependency_on(DepChange& changes) {
1946 // What has happened:
1947 // 1) a new class dependee has been added
1948 // 2) dependee and all its super classes have been marked
1949 bool found_check = false; // set true if we are upset
1950 for (Dependencies::DepStream deps(this); deps.next(); ) {
1951 // Evaluate only relevant dependencies.
1952 if (deps.spot_check_dependency_at(changes) != NULL) {
1953 found_check = true;
1954 NOT_DEBUG(break);
1955 }
1956 }
1957 return found_check;
1958 }
1959
1960 bool nmethod::is_evol_dependent_on(Klass* dependee) {
1961 InstanceKlass *dependee_ik = InstanceKlass::cast(dependee);
1962 Array<Method*>* dependee_methods = dependee_ik->methods();
1963 for (Dependencies::DepStream deps(this); deps.next(); ) {
1964 if (deps.type() == Dependencies::evol_method) {
1965 Method* method = deps.method_argument(0);
1966 for (int j = 0; j < dependee_methods->length(); j++) {
1967 if (dependee_methods->at(j) == method) {
1968 if (log_is_enabled(Debug, redefine, class, nmethod)) {
1969 ResourceMark rm;
1970 log_debug(redefine, class, nmethod)
1971 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)",
1972 _method->method_holder()->external_name(),
1973 _method->name()->as_C_string(),
1974 _method->signature()->as_C_string(),
1975 compile_id(),
1976 method->method_holder()->external_name(),
1977 method->name()->as_C_string(),
1978 method->signature()->as_C_string());
1979 }
1980 if (TraceDependencies || LogCompilation)
1981 deps.log_dependency(dependee);
1982 return true;
1983 }
1984 }
1985 }
1986 }
1987 return false;
1988 }
1989
1990 // Called from mark_for_deoptimization, when dependee is invalidated.
1991 bool nmethod::is_dependent_on_method(Method* dependee) {
1992 for (Dependencies::DepStream deps(this); deps.next(); ) {
1993 if (deps.type() != Dependencies::evol_method)
1994 continue;
1995 Method* method = deps.method_argument(0);
1996 if (method == dependee) return true;
1997 }
1998 return false;
1999 }
2000
2001
2002 bool nmethod::is_patchable_at(address instr_addr) {
2003 assert(insts_contains(instr_addr), "wrong nmethod used");
2004 if (is_zombie()) {
2005 // a zombie may never be patched
2006 return false;
2007 }
2008 return true;
2009 }
2010
2011
2012 address nmethod::continuation_for_implicit_exception(address pc) {
2013 // Exception happened outside inline-cache check code => we are inside
2014 // an active nmethod => use cpc to determine a return address
2015 int exception_offset = pc - code_begin();
2016 int cont_offset = ImplicitExceptionTable(this).at( exception_offset );
2017 #ifdef ASSERT
2018 if (cont_offset == 0) {
2019 Thread* thread = Thread::current();
2020 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
2021 HandleMark hm(thread);
2022 ResourceMark rm(thread);
2023 CodeBlob* cb = CodeCache::find_blob(pc);
2024 assert(cb != NULL && cb == this, "");
2025 ttyLocker ttyl;
2026 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, p2i(pc));
2027 print();
2028 method()->print_codes();
2029 print_code();
2030 print_pcs();
2031 }
2032 #endif
2033 if (cont_offset == 0) {
2034 // Let the normal error handling report the exception
2035 return NULL;
2036 }
2037 return code_begin() + cont_offset;
2038 }
2039
2040
2041
2042 void nmethod_init() {
2043 // make sure you didn't forget to adjust the filler fields
2044 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
2045 }
2046
2047
2048 //-------------------------------------------------------------------------------------------
2049
2050
2051 // QQQ might we make this work from a frame??
2052 nmethodLocker::nmethodLocker(address pc) {
2053 CodeBlob* cb = CodeCache::find_blob(pc);
2054 guarantee(cb != NULL && cb->is_compiled(), "bad pc for a nmethod found");
2055 _nm = cb->as_compiled_method();
2056 lock_nmethod(_nm);
2057 }
2058
2059 // Only JvmtiDeferredEvent::compiled_method_unload_event()
2060 // should pass zombie_ok == true.
2061 void nmethodLocker::lock_nmethod(CompiledMethod* cm, bool zombie_ok) {
2062 if (cm == NULL) return;
2063 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method
2064 nmethod* nm = cm->as_nmethod();
2065 Atomic::inc(&nm->_lock_count);
2066 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method");
2067 }
2068
2069 void nmethodLocker::unlock_nmethod(CompiledMethod* cm) {
2070 if (cm == NULL) return;
2071 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method
2072 nmethod* nm = cm->as_nmethod();
2073 Atomic::dec(&nm->_lock_count);
2074 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock");
2075 }
2076
2077
2078 // -----------------------------------------------------------------------------
2079 // Verification
2080
2081 class VerifyOopsClosure: public OopClosure {
2082 nmethod* _nm;
2083 bool _ok;
2084 public:
2085 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
2086 bool ok() { return _ok; }
2087 virtual void do_oop(oop* p) {
2088 if ((*p) == NULL || (*p)->is_oop()) return;
2089 if (_ok) {
2090 _nm->print_nmethod(true);
2091 _ok = false;
2092 }
2093 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2094 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2095 }
2096 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2097 };
2098
2099 void nmethod::verify() {
2100
2101 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant
2102 // seems odd.
2103
2104 if (is_zombie() || is_not_entrant() || is_unloaded())
2105 return;
2106
2107 // Make sure all the entry points are correctly aligned for patching.
2108 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
2109
2110 // assert(method()->is_oop(), "must be valid");
2111
2112 ResourceMark rm;
2113
2114 if (!CodeCache::contains(this)) {
2115 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this));
2116 }
2117
2118 if(is_native_method() )
2119 return;
2120
2121 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
2122 if (nm != this) {
2123 fatal("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this));
2124 }
2125
2126 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2127 if (! p->verify(this)) {
2128 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this));
2129 }
2130 }
2131
2132 VerifyOopsClosure voc(this);
2133 oops_do(&voc);
2134 assert(voc.ok(), "embedded oops must be OK");
2135 verify_scavenge_root_oops();
2136
2137 verify_scopes();
2138 }
2139
2140
2141 void nmethod::verify_interrupt_point(address call_site) {
2142 // Verify IC only when nmethod installation is finished.
2143 bool is_installed = (method()->code() == this) // nmethod is in state 'in_use' and installed
2144 || !this->is_in_use(); // nmethod is installed, but not in 'in_use' state
2145 if (is_installed) {
2146 Thread *cur = Thread::current();
2147 if (CompiledIC_lock->owner() == cur ||
2148 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) &&
2149 SafepointSynchronize::is_at_safepoint())) {
2150 CompiledIC_at(this, call_site);
2151 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
2152 } else {
2153 MutexLocker ml_verify (CompiledIC_lock);
2154 CompiledIC_at(this, call_site);
2155 }
2156 }
2157
2158 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address());
2159 assert(pd != NULL, "PcDesc must exist");
2160 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(),
2161 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(),
2162 pd->return_oop(), pd->return_vt());
2163 !sd->is_top(); sd = sd->sender()) {
2164 sd->verify();
2165 }
2166 }
2167
2168 void nmethod::verify_scopes() {
2169 if( !method() ) return; // Runtime stubs have no scope
2170 if (method()->is_native()) return; // Ignore stub methods.
2171 // iterate through all interrupt point
2172 // and verify the debug information is valid.
2173 RelocIterator iter((nmethod*)this);
2174 while (iter.next()) {
2175 address stub = NULL;
2176 switch (iter.type()) {
2177 case relocInfo::virtual_call_type:
2178 verify_interrupt_point(iter.addr());
2179 break;
2180 case relocInfo::opt_virtual_call_type:
2181 stub = iter.opt_virtual_call_reloc()->static_stub(false);
2182 verify_interrupt_point(iter.addr());
2183 break;
2184 case relocInfo::static_call_type:
2185 stub = iter.static_call_reloc()->static_stub(false);
2186 //verify_interrupt_point(iter.addr());
2187 break;
2188 case relocInfo::runtime_call_type:
2189 case relocInfo::runtime_call_w_cp_type:
2190 address destination = iter.reloc()->value();
2191 // Right now there is no way to find out which entries support
2192 // an interrupt point. It would be nice if we had this
2193 // information in a table.
2194 break;
2195 }
2196 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section");
2197 }
2198 }
2199
2200
2201 // -----------------------------------------------------------------------------
2202 // Non-product code
2203 #ifndef PRODUCT
2204
2205 class DebugScavengeRoot: public OopClosure {
2206 nmethod* _nm;
2207 bool _ok;
2208 public:
2209 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { }
2210 bool ok() { return _ok; }
2211 virtual void do_oop(oop* p) {
2212 if ((*p) == NULL || !(*p)->is_scavengable()) return;
2213 if (_ok) {
2214 _nm->print_nmethod(true);
2215 _ok = false;
2216 }
2217 tty->print_cr("*** scavengable oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2218 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2219 (*p)->print();
2220 }
2221 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2222 };
2223
2224 void nmethod::verify_scavenge_root_oops() {
2225 if (UseG1GC) {
2226 return;
2227 }
2228
2229 if (!on_scavenge_root_list()) {
2230 // Actually look inside, to verify the claim that it's clean.
2231 DebugScavengeRoot debug_scavenge_root(this);
2232 oops_do(&debug_scavenge_root);
2233 if (!debug_scavenge_root.ok())
2234 fatal("found an unadvertised bad scavengable oop in the code cache");
2235 }
2236 assert(scavenge_root_not_marked(), "");
2237 }
2238
2239 #endif // PRODUCT
2240
2241 // Printing operations
2242
2243 void nmethod::print() const {
2244 ResourceMark rm;
2245 ttyLocker ttyl; // keep the following output all in one block
2246
2247 tty->print("Compiled method ");
2248
2249 if (is_compiled_by_c1()) {
2250 tty->print("(c1) ");
2251 } else if (is_compiled_by_c2()) {
2252 tty->print("(c2) ");
2253 } else if (is_compiled_by_shark()) {
2254 tty->print("(shark) ");
2255 } else if (is_compiled_by_jvmci()) {
2256 tty->print("(JVMCI) ");
2257 } else {
2258 tty->print("(nm) ");
2259 }
2260
2261 print_on(tty, NULL);
2262
2263 if (WizardMode) {
2264 tty->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this));
2265 tty->print(" for method " INTPTR_FORMAT , p2i(method()));
2266 tty->print(" { ");
2267 tty->print_cr("%s ", state());
2268 if (on_scavenge_root_list()) tty->print("scavenge_root ");
2269 tty->print_cr("}:");
2270 }
2271 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2272 p2i(this),
2273 p2i(this) + size(),
2274 size());
2275 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2276 p2i(relocation_begin()),
2277 p2i(relocation_end()),
2278 relocation_size());
2279 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2280 p2i(consts_begin()),
2281 p2i(consts_end()),
2282 consts_size());
2283 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2284 p2i(insts_begin()),
2285 p2i(insts_end()),
2286 insts_size());
2287 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2288 p2i(stub_begin()),
2289 p2i(stub_end()),
2290 stub_size());
2291 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2292 p2i(oops_begin()),
2293 p2i(oops_end()),
2294 oops_size());
2295 if (metadata_size () > 0) tty->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2296 p2i(metadata_begin()),
2297 p2i(metadata_end()),
2298 metadata_size());
2299 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2300 p2i(scopes_data_begin()),
2301 p2i(scopes_data_end()),
2302 scopes_data_size());
2303 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2304 p2i(scopes_pcs_begin()),
2305 p2i(scopes_pcs_end()),
2306 scopes_pcs_size());
2307 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2308 p2i(dependencies_begin()),
2309 p2i(dependencies_end()),
2310 dependencies_size());
2311 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2312 p2i(handler_table_begin()),
2313 p2i(handler_table_end()),
2314 handler_table_size());
2315 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2316 p2i(nul_chk_table_begin()),
2317 p2i(nul_chk_table_end()),
2318 nul_chk_table_size());
2319 }
2320
2321 #ifndef PRODUCT
2322
2323 void nmethod::print_scopes() {
2324 // Find the first pc desc for all scopes in the code and print it.
2325 ResourceMark rm;
2326 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2327 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
2328 continue;
2329
2330 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
2331 while (sd != NULL) {
2332 sd->print_on(tty, p);
2333 sd = sd->sender();
2334 }
2335 }
2336 }
2337
2338 void nmethod::print_dependencies() {
2339 ResourceMark rm;
2340 ttyLocker ttyl; // keep the following output all in one block
2341 tty->print_cr("Dependencies:");
2342 for (Dependencies::DepStream deps(this); deps.next(); ) {
2343 deps.print_dependency();
2344 Klass* ctxk = deps.context_type();
2345 if (ctxk != NULL) {
2346 if (ctxk->is_instance_klass() && InstanceKlass::cast(ctxk)->is_dependent_nmethod(this)) {
2347 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name());
2348 }
2349 }
2350 deps.log_dependency(); // put it into the xml log also
2351 }
2352 }
2353
2354
2355 void nmethod::print_relocations() {
2356 ResourceMark m; // in case methods get printed via the debugger
2357 tty->print_cr("relocations:");
2358 RelocIterator iter(this);
2359 iter.print();
2360 if (UseRelocIndex) {
2361 jint* index_end = (jint*)relocation_end() - 1;
2362 jint index_size = *index_end;
2363 jint* index_start = (jint*)( (address)index_end - index_size );
2364 tty->print_cr(" index @" INTPTR_FORMAT ": index_size=%d", p2i(index_start), index_size);
2365 if (index_size > 0) {
2366 jint* ip;
2367 for (ip = index_start; ip+2 <= index_end; ip += 2)
2368 tty->print_cr(" (%d %d) addr=" INTPTR_FORMAT " @" INTPTR_FORMAT,
2369 ip[0],
2370 ip[1],
2371 p2i(header_end()+ip[0]),
2372 p2i(relocation_begin()-1+ip[1]));
2373 for (; ip < index_end; ip++)
2374 tty->print_cr(" (%d ?)", ip[0]);
2375 tty->print_cr(" @" INTPTR_FORMAT ": index_size=%d", p2i(ip), *ip);
2376 ip++;
2377 tty->print_cr("reloc_end @" INTPTR_FORMAT ":", p2i(ip));
2378 }
2379 }
2380 }
2381
2382
2383 void nmethod::print_pcs() {
2384 ResourceMark m; // in case methods get printed via debugger
2385 tty->print_cr("pc-bytecode offsets:");
2386 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2387 p->print(this);
2388 }
2389 }
2390
2391 void nmethod::print_recorded_oops() {
2392 tty->print_cr("Recorded oops:");
2393 for (int i = 0; i < oops_count(); i++) {
2394 oop o = oop_at(i);
2395 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(o));
2396 if (o == (oop)Universe::non_oop_word()) {
2397 tty->print("non-oop word");
2398 } else {
2399 o->print_value();
2400 }
2401 tty->cr();
2402 }
2403 }
2404
2405 void nmethod::print_recorded_metadata() {
2406 tty->print_cr("Recorded metadata:");
2407 for (int i = 0; i < metadata_count(); i++) {
2408 Metadata* m = metadata_at(i);
2409 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(m));
2410 if (m == (Metadata*)Universe::non_oop_word()) {
2411 tty->print("non-metadata word");
2412 } else {
2413 m->print_value_on_maybe_null(tty);
2414 }
2415 tty->cr();
2416 }
2417 }
2418
2419 #endif // PRODUCT
2420
2421 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
2422 RelocIterator iter(this, begin, end);
2423 bool have_one = false;
2424 while (iter.next()) {
2425 have_one = true;
2426 switch (iter.type()) {
2427 case relocInfo::none: return "no_reloc";
2428 case relocInfo::oop_type: {
2429 stringStream st;
2430 oop_Relocation* r = iter.oop_reloc();
2431 oop obj = r->oop_value();
2432 st.print("oop(");
2433 if (obj == NULL) st.print("NULL");
2434 else obj->print_value_on(&st);
2435 st.print(")");
2436 return st.as_string();
2437 }
2438 case relocInfo::metadata_type: {
2439 stringStream st;
2440 metadata_Relocation* r = iter.metadata_reloc();
2441 Metadata* obj = r->metadata_value();
2442 st.print("metadata(");
2443 if (obj == NULL) st.print("NULL");
2444 else obj->print_value_on(&st);
2445 st.print(")");
2446 return st.as_string();
2447 }
2448 case relocInfo::runtime_call_type:
2449 case relocInfo::runtime_call_w_cp_type: {
2450 stringStream st;
2451 st.print("runtime_call");
2452 CallRelocation* r = (CallRelocation*)iter.reloc();
2453 address dest = r->destination();
2454 CodeBlob* cb = CodeCache::find_blob(dest);
2455 if (cb != NULL) {
2456 st.print(" %s", cb->name());
2457 } else {
2458 ResourceMark rm;
2459 const int buflen = 1024;
2460 char* buf = NEW_RESOURCE_ARRAY(char, buflen);
2461 int offset;
2462 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) {
2463 st.print(" %s", buf);
2464 if (offset != 0) {
2465 st.print("+%d", offset);
2466 }
2467 }
2468 }
2469 return st.as_string();
2470 }
2471 case relocInfo::virtual_call_type: {
2472 stringStream st;
2473 st.print_raw("virtual_call");
2474 virtual_call_Relocation* r = iter.virtual_call_reloc();
2475 Method* m = r->method_value();
2476 if (m != NULL) {
2477 assert(m->is_method(), "");
2478 m->print_short_name(&st);
2479 }
2480 return st.as_string();
2481 }
2482 case relocInfo::opt_virtual_call_type: {
2483 stringStream st;
2484 st.print_raw("optimized virtual_call");
2485 opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc();
2486 Method* m = r->method_value();
2487 if (m != NULL) {
2488 assert(m->is_method(), "");
2489 m->print_short_name(&st);
2490 }
2491 return st.as_string();
2492 }
2493 case relocInfo::static_call_type: {
2494 stringStream st;
2495 st.print_raw("static_call");
2496 static_call_Relocation* r = iter.static_call_reloc();
2497 Method* m = r->method_value();
2498 if (m != NULL) {
2499 assert(m->is_method(), "");
2500 m->print_short_name(&st);
2501 }
2502 return st.as_string();
2503 }
2504 case relocInfo::static_stub_type: return "static_stub";
2505 case relocInfo::external_word_type: return "external_word";
2506 case relocInfo::internal_word_type: return "internal_word";
2507 case relocInfo::section_word_type: return "section_word";
2508 case relocInfo::poll_type: return "poll";
2509 case relocInfo::poll_return_type: return "poll_return";
2510 case relocInfo::type_mask: return "type_bit_mask";
2511 }
2512 }
2513 return have_one ? "other" : NULL;
2514 }
2515
2516 // Return a the last scope in (begin..end]
2517 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
2518 PcDesc* p = pc_desc_near(begin+1);
2519 if (p != NULL && p->real_pc(this) <= end) {
2520 return new ScopeDesc(this, p->scope_decode_offset(),
2521 p->obj_decode_offset(), p->should_reexecute(), p->rethrow_exception(),
2522 p->return_oop(), p->return_vt());
2523 }
2524 return NULL;
2525 }
2526
2527 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const {
2528 if (block_begin == entry_point()) stream->print_cr("[Entry Point]");
2529 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]");
2530 if (JVMCI_ONLY(_exception_offset >= 0 &&) block_begin == exception_begin()) stream->print_cr("[Exception Handler]");
2531 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]");
2532 if (JVMCI_ONLY(_deopt_handler_begin != NULL &&) block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]");
2533
2534 if (has_method_handle_invokes())
2535 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]");
2536
2537 if (block_begin == consts_begin()) stream->print_cr("[Constants]");
2538
2539 if (block_begin == entry_point()) {
2540 methodHandle m = method();
2541 if (m.not_null()) {
2542 stream->print(" # ");
2543 m->print_value_on(stream);
2544 stream->cr();
2545 }
2546 if (m.not_null() && !is_osr_method()) {
2547 ResourceMark rm;
2548 int sizeargs = m->size_of_parameters();
2549 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
2550 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
2551 {
2552 int sig_index = 0;
2553 if (!m->is_static())
2554 sig_bt[sig_index++] = T_OBJECT; // 'this'
2555 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) {
2556 BasicType t = ss.type();
2557 sig_bt[sig_index++] = t;
2558 if (type2size[t] == 2) {
2559 sig_bt[sig_index++] = T_VOID;
2560 } else {
2561 assert(type2size[t] == 1, "size is 1 or 2");
2562 }
2563 }
2564 assert(sig_index == sizeargs, "");
2565 }
2566 const char* spname = "sp"; // make arch-specific?
2567 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false);
2568 int stack_slot_offset = this->frame_size() * wordSize;
2569 int tab1 = 14, tab2 = 24;
2570 int sig_index = 0;
2571 int arg_index = (m->is_static() ? 0 : -1);
2572 bool did_old_sp = false;
2573 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) {
2574 bool at_this = (arg_index == -1);
2575 bool at_old_sp = false;
2576 BasicType t = (at_this ? T_OBJECT : ss.type());
2577 assert(t == sig_bt[sig_index], "sigs in sync");
2578 if (at_this)
2579 stream->print(" # this: ");
2580 else
2581 stream->print(" # parm%d: ", arg_index);
2582 stream->move_to(tab1);
2583 VMReg fst = regs[sig_index].first();
2584 VMReg snd = regs[sig_index].second();
2585 if (fst->is_reg()) {
2586 stream->print("%s", fst->name());
2587 if (snd->is_valid()) {
2588 stream->print(":%s", snd->name());
2589 }
2590 } else if (fst->is_stack()) {
2591 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
2592 if (offset == stack_slot_offset) at_old_sp = true;
2593 stream->print("[%s+0x%x]", spname, offset);
2594 } else {
2595 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
2596 }
2597 stream->print(" ");
2598 stream->move_to(tab2);
2599 stream->print("= ");
2600 if (at_this) {
2601 m->method_holder()->print_value_on(stream);
2602 } else {
2603 bool did_name = false;
2604 if (!at_this && ss.is_object()) {
2605 Symbol* name = ss.as_symbol_or_null();
2606 if (name != NULL) {
2607 name->print_value_on(stream);
2608 did_name = true;
2609 }
2610 }
2611 if (!did_name)
2612 stream->print("%s", type2name(t));
2613 }
2614 if (at_old_sp) {
2615 stream->print(" (%s of caller)", spname);
2616 did_old_sp = true;
2617 }
2618 stream->cr();
2619 sig_index += type2size[t];
2620 arg_index += 1;
2621 if (!at_this) ss.next();
2622 }
2623 if (!did_old_sp) {
2624 stream->print(" # ");
2625 stream->move_to(tab1);
2626 stream->print("[%s+0x%x]", spname, stack_slot_offset);
2627 stream->print(" (%s of caller)", spname);
2628 stream->cr();
2629 }
2630 }
2631 }
2632 }
2633
2634 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) {
2635 // First, find an oopmap in (begin, end].
2636 // We use the odd half-closed interval so that oop maps and scope descs
2637 // which are tied to the byte after a call are printed with the call itself.
2638 address base = code_begin();
2639 ImmutableOopMapSet* oms = oop_maps();
2640 if (oms != NULL) {
2641 for (int i = 0, imax = oms->count(); i < imax; i++) {
2642 const ImmutableOopMapPair* pair = oms->pair_at(i);
2643 const ImmutableOopMap* om = pair->get_from(oms);
2644 address pc = base + pair->pc_offset();
2645 if (pc > begin) {
2646 if (pc <= end) {
2647 st->move_to(column);
2648 st->print("; ");
2649 om->print_on(st);
2650 }
2651 break;
2652 }
2653 }
2654 }
2655
2656 // Print any debug info present at this pc.
2657 ScopeDesc* sd = scope_desc_in(begin, end);
2658 if (sd != NULL) {
2659 st->move_to(column);
2660 if (sd->bci() == SynchronizationEntryBCI) {
2661 st->print(";*synchronization entry");
2662 } else {
2663 if (sd->method() == NULL) {
2664 st->print("method is NULL");
2665 } else if (sd->method()->is_native()) {
2666 st->print("method is native");
2667 } else {
2668 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci());
2669 st->print(";*%s", Bytecodes::name(bc));
2670 switch (bc) {
2671 case Bytecodes::_invokevirtual:
2672 case Bytecodes::_invokespecial:
2673 case Bytecodes::_invokestatic:
2674 case Bytecodes::_invokeinterface:
2675 {
2676 Bytecode_invoke invoke(sd->method(), sd->bci());
2677 st->print(" ");
2678 if (invoke.name() != NULL)
2679 invoke.name()->print_symbol_on(st);
2680 else
2681 st->print("<UNKNOWN>");
2682 break;
2683 }
2684 case Bytecodes::_getfield:
2685 case Bytecodes::_putfield:
2686 case Bytecodes::_getstatic:
2687 case Bytecodes::_putstatic:
2688 {
2689 Bytecode_field field(sd->method(), sd->bci());
2690 st->print(" ");
2691 if (field.name() != NULL)
2692 field.name()->print_symbol_on(st);
2693 else
2694 st->print("<UNKNOWN>");
2695 }
2696 }
2697 }
2698 st->print(" {reexecute=%d rethrow=%d return_oop=%d return_vt=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop(), sd->return_vt());
2699 }
2700
2701 // Print all scopes
2702 for (;sd != NULL; sd = sd->sender()) {
2703 st->move_to(column);
2704 st->print("; -");
2705 if (sd->method() == NULL) {
2706 st->print("method is NULL");
2707 } else {
2708 sd->method()->print_short_name(st);
2709 }
2710 int lineno = sd->method()->line_number_from_bci(sd->bci());
2711 if (lineno != -1) {
2712 st->print("@%d (line %d)", sd->bci(), lineno);
2713 } else {
2714 st->print("@%d", sd->bci());
2715 }
2716 st->cr();
2717 }
2718 }
2719
2720 // Print relocation information
2721 const char* str = reloc_string_for(begin, end);
2722 if (str != NULL) {
2723 if (sd != NULL) st->cr();
2724 st->move_to(column);
2725 st->print("; {%s}", str);
2726 }
2727 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin());
2728 if (cont_offset != 0) {
2729 st->move_to(column);
2730 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset));
2731 }
2732
2733 }
2734
2735 class DirectNativeCallWrapper: public NativeCallWrapper {
2736 private:
2737 NativeCall* _call;
2738
2739 public:
2740 DirectNativeCallWrapper(NativeCall* call) : _call(call) {}
2741
2742 virtual address destination() const { return _call->destination(); }
2743 virtual address instruction_address() const { return _call->instruction_address(); }
2744 virtual address next_instruction_address() const { return _call->next_instruction_address(); }
2745 virtual address return_address() const { return _call->return_address(); }
2746
2747 virtual address get_resolve_call_stub(bool is_optimized) const {
2748 if (is_optimized) {
2749 return SharedRuntime::get_resolve_opt_virtual_call_stub();
2750 }
2751 return SharedRuntime::get_resolve_virtual_call_stub();
2752 }
2753
2754 virtual void set_destination_mt_safe(address dest) {
2755 #if INCLUDE_AOT
2756 if (UseAOT) {
2757 CodeBlob* callee = CodeCache::find_blob(dest);
2758 CompiledMethod* cm = callee->as_compiled_method_or_null();
2759 if (cm != NULL && cm->is_far_code()) {
2760 // Temporary fix, see JDK-8143106
2761 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address());
2762 csc->set_to_far(methodHandle(cm->method()), dest);
2763 return;
2764 }
2765 }
2766 #endif
2767 _call->set_destination_mt_safe(dest);
2768 }
2769
2770 virtual void set_to_interpreted(const methodHandle& method, CompiledICInfo& info) {
2771 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address());
2772 #if INCLUDE_AOT
2773 if (info.to_aot()) {
2774 csc->set_to_far(method, info.entry());
2775 } else
2776 #endif
2777 {
2778 csc->set_to_interpreted(method, info.entry());
2779 }
2780 }
2781
2782 virtual void verify() const {
2783 // make sure code pattern is actually a call imm32 instruction
2784 _call->verify();
2785 if (os::is_MP()) {
2786 _call->verify_alignment();
2787 }
2788 }
2789
2790 virtual void verify_resolve_call(address dest) const {
2791 CodeBlob* db = CodeCache::find_blob_unsafe(dest);
2792 assert(!db->is_adapter_blob(), "must use stub!");
2793 }
2794
2795 virtual bool is_call_to_interpreted(address dest) const {
2796 CodeBlob* cb = CodeCache::find_blob(_call->instruction_address());
2797 return cb->contains(dest);
2798 }
2799
2800 virtual bool is_safe_for_patching() const { return false; }
2801
2802 virtual NativeInstruction* get_load_instruction(virtual_call_Relocation* r) const {
2803 return nativeMovConstReg_at(r->cached_value());
2804 }
2805
2806 virtual void *get_data(NativeInstruction* instruction) const {
2807 return (void*)((NativeMovConstReg*) instruction)->data();
2808 }
2809
2810 virtual void set_data(NativeInstruction* instruction, intptr_t data) {
2811 ((NativeMovConstReg*) instruction)->set_data(data);
2812 }
2813 };
2814
2815 NativeCallWrapper* nmethod::call_wrapper_at(address call) const {
2816 return new DirectNativeCallWrapper((NativeCall*) call);
2817 }
2818
2819 NativeCallWrapper* nmethod::call_wrapper_before(address return_pc) const {
2820 return new DirectNativeCallWrapper(nativeCall_before(return_pc));
2821 }
2822
2823 address nmethod::call_instruction_address(address pc) const {
2824 if (NativeCall::is_call_before(pc)) {
2825 NativeCall *ncall = nativeCall_before(pc);
2826 return ncall->instruction_address();
2827 }
2828 return NULL;
2829 }
2830
2831 CompiledStaticCall* nmethod::compiledStaticCall_at(Relocation* call_site) const {
2832 return CompiledDirectStaticCall::at(call_site);
2833 }
2834
2835 CompiledStaticCall* nmethod::compiledStaticCall_at(address call_site) const {
2836 return CompiledDirectStaticCall::at(call_site);
2837 }
2838
2839 CompiledStaticCall* nmethod::compiledStaticCall_before(address return_addr) const {
2840 return CompiledDirectStaticCall::before(return_addr);
2841 }
2842
2843 #ifndef PRODUCT
2844
2845 void nmethod::print_value_on(outputStream* st) const {
2846 st->print("nmethod");
2847 print_on(st, NULL);
2848 }
2849
2850 void nmethod::print_calls(outputStream* st) {
2851 RelocIterator iter(this);
2852 while (iter.next()) {
2853 switch (iter.type()) {
2854 case relocInfo::virtual_call_type:
2855 case relocInfo::opt_virtual_call_type: {
2856 VerifyMutexLocker mc(CompiledIC_lock);
2857 CompiledIC_at(&iter)->print();
2858 break;
2859 }
2860 case relocInfo::static_call_type:
2861 st->print_cr("Static call at " INTPTR_FORMAT, p2i(iter.reloc()->addr()));
2862 CompiledDirectStaticCall::at(iter.reloc())->print();
2863 break;
2864 }
2865 }
2866 }
2867
2868 void nmethod::print_handler_table() {
2869 ExceptionHandlerTable(this).print();
2870 }
2871
2872 void nmethod::print_nul_chk_table() {
2873 ImplicitExceptionTable(this).print(code_begin());
2874 }
2875
2876 void nmethod::print_statistics() {
2877 ttyLocker ttyl;
2878 if (xtty != NULL) xtty->head("statistics type='nmethod'");
2879 native_nmethod_stats.print_native_nmethod_stats();
2880 #ifdef COMPILER1
2881 c1_java_nmethod_stats.print_nmethod_stats("C1");
2882 #endif
2883 #ifdef COMPILER2
2884 c2_java_nmethod_stats.print_nmethod_stats("C2");
2885 #endif
2886 #if INCLUDE_JVMCI
2887 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI");
2888 #endif
2889 #ifdef SHARK
2890 shark_java_nmethod_stats.print_nmethod_stats("Shark");
2891 #endif
2892 unknown_java_nmethod_stats.print_nmethod_stats("Unknown");
2893 DebugInformationRecorder::print_statistics();
2894 #ifndef PRODUCT
2895 pc_nmethod_stats.print_pc_stats();
2896 #endif
2897 Dependencies::print_statistics();
2898 if (xtty != NULL) xtty->tail("statistics");
2899 }
2900
2901 #endif // !PRODUCT
2902
2903 #if INCLUDE_JVMCI
2904 void nmethod::clear_jvmci_installed_code() {
2905 // write_ref_method_pre/post can only be safely called at a
2906 // safepoint or while holding the CodeCache_lock
2907 assert(CodeCache_lock->is_locked() ||
2908 SafepointSynchronize::is_at_safepoint(), "should be performed under a lock for consistency");
2909 if (_jvmci_installed_code != NULL) {
2910 // This must be done carefully to maintain nmethod remembered sets properly
2911 BarrierSet* bs = Universe::heap()->barrier_set();
2912 bs->write_ref_nmethod_pre(&_jvmci_installed_code, this);
2913 _jvmci_installed_code = NULL;
2914 bs->write_ref_nmethod_post(&_jvmci_installed_code, this);
2915 }
2916 }
2917
2918 void nmethod::maybe_invalidate_installed_code() {
2919 assert(Patching_lock->is_locked() ||
2920 SafepointSynchronize::is_at_safepoint(), "should be performed under a lock for consistency");
2921 oop installed_code = jvmci_installed_code();
2922 if (installed_code != NULL) {
2923 nmethod* nm = (nmethod*)InstalledCode::address(installed_code);
2924 if (nm == NULL || nm != this) {
2925 // The link has been broken or the InstalledCode instance is
2926 // associated with another nmethod so do nothing.
2927 return;
2928 }
2929 if (!is_alive()) {
2930 // Break the link between nmethod and InstalledCode such that the nmethod
2931 // can subsequently be flushed safely. The link must be maintained while
2932 // the method could have live activations since invalidateInstalledCode
2933 // might want to invalidate all existing activations.
2934 InstalledCode::set_address(installed_code, 0);
2935 InstalledCode::set_entryPoint(installed_code, 0);
2936 } else if (is_not_entrant()) {
2937 // Remove the entry point so any invocation will fail but keep
2938 // the address link around that so that existing activations can
2939 // be invalidated.
2940 InstalledCode::set_entryPoint(installed_code, 0);
2941 }
2942 }
2943 }
2944
2945 void nmethod::invalidate_installed_code(Handle installedCode, TRAPS) {
2946 if (installedCode() == NULL) {
2947 THROW(vmSymbols::java_lang_NullPointerException());
2948 }
2949 jlong nativeMethod = InstalledCode::address(installedCode);
2950 nmethod* nm = (nmethod*)nativeMethod;
2951 if (nm == NULL) {
2952 // Nothing to do
2953 return;
2954 }
2955
2956 nmethodLocker nml(nm);
2957 #ifdef ASSERT
2958 {
2959 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
2960 // This relationship can only be checked safely under a lock
2961 assert(nm == NULL || !nm->is_alive() || nm->jvmci_installed_code() == installedCode(), "sanity check");
2962 }
2963 #endif
2964
2965 if (nm->is_alive()) {
2966 // The nmethod state machinery maintains the link between the
2967 // HotSpotInstalledCode and nmethod* so as long as the nmethod appears to be
2968 // alive assume there is work to do and deoptimize the nmethod.
2969 nm->mark_for_deoptimization();
2970 VM_Deoptimize op;
2971 VMThread::execute(&op);
2972 }
2973
2974 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
2975 // Check that it's still associated with the same nmethod and break
2976 // the link if it is.
2977 if (InstalledCode::address(installedCode) == nativeMethod) {
2978 InstalledCode::set_address(installedCode, 0);
2979 }
2980 }
2981
2982 char* nmethod::jvmci_installed_code_name(char* buf, size_t buflen) {
2983 if (!this->is_compiled_by_jvmci()) {
2984 return NULL;
2985 }
2986 oop installedCode = this->jvmci_installed_code();
2987 if (installedCode != NULL) {
2988 oop installedCodeName = NULL;
2989 if (installedCode->is_a(InstalledCode::klass())) {
2990 installedCodeName = InstalledCode::name(installedCode);
2991 }
2992 if (installedCodeName != NULL) {
2993 return java_lang_String::as_utf8_string(installedCodeName, buf, (int)buflen);
2994 } else {
2995 jio_snprintf(buf, buflen, "null");
2996 return buf;
2997 }
2998 }
2999 jio_snprintf(buf, buflen, "noInstalledCode");
3000 return buf;
3001 }
3002 #endif
3003