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