1 /*
2 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "code/codeCache.hpp"
27 #include "code/compiledIC.hpp"
28 #include "code/dependencies.hpp"
29 #include "code/nativeInst.hpp"
30 #include "code/nmethod.hpp"
31 #include "code/scopeDesc.hpp"
32 #include "compiler/abstractCompiler.hpp"
33 #include "compiler/compileBroker.hpp"
34 #include "compiler/compileLog.hpp"
35 #include "compiler/compilerDirectives.hpp"
36 #include "compiler/directivesParser.hpp"
37 #include "compiler/disassembler.hpp"
38 #include "interpreter/bytecode.hpp"
39 #include "logging/log.hpp"
40 #include "logging/logStream.hpp"
41 #include "memory/resourceArea.hpp"
42 #include "oops/methodData.hpp"
43 #include "oops/oop.inline.hpp"
44 #include "prims/jvmtiImpl.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 if (UseG1GC) {
414 _unloading_next = NULL;
415 } else {
416 _scavenge_root_link = NULL;
417 }
418 _scavenge_root_state = 0;
419 #if INCLUDE_RTM_OPT
420 _rtm_state = NoRTM;
421 #endif
422 #if INCLUDE_JVMCI
423 _jvmci_installed_code = NULL;
424 _speculation_log = NULL;
425 #endif
426 }
427
428 nmethod* nmethod::new_native_nmethod(const methodHandle& method,
429 int compile_id,
430 CodeBuffer *code_buffer,
431 int vep_offset,
432 int frame_complete,
433 int frame_size,
434 ByteSize basic_lock_owner_sp_offset,
435 ByteSize basic_lock_sp_offset,
436 OopMapSet* oop_maps) {
437 code_buffer->finalize_oop_references(method);
438 // create nmethod
439 nmethod* nm = NULL;
440 {
441 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
442 int native_nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod));
443 CodeOffsets offsets;
444 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
445 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
446 nm = new (native_nmethod_size, CompLevel_none) nmethod(method(), compiler_none, native_nmethod_size,
447 compile_id, &offsets,
448 code_buffer, frame_size,
449 basic_lock_owner_sp_offset,
450 basic_lock_sp_offset, oop_maps);
451 NOT_PRODUCT(if (nm != NULL) native_nmethod_stats.note_native_nmethod(nm));
452 }
453 // verify nmethod
454 debug_only(if (nm) nm->verify();) // might block
455
456 if (nm != NULL) {
457 nm->log_new_nmethod();
458 }
459
460 return nm;
461 }
462
463 nmethod* nmethod::new_nmethod(const methodHandle& method,
464 int compile_id,
465 int entry_bci,
466 CodeOffsets* offsets,
467 int orig_pc_offset,
468 DebugInformationRecorder* debug_info,
469 Dependencies* dependencies,
470 CodeBuffer* code_buffer, int frame_size,
471 OopMapSet* oop_maps,
472 ExceptionHandlerTable* handler_table,
473 ImplicitExceptionTable* nul_chk_table,
474 AbstractCompiler* compiler,
475 int comp_level
476 #if INCLUDE_JVMCI
477 , Handle installed_code,
478 Handle speculationLog
479 #endif
480 )
481 {
482 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
483 code_buffer->finalize_oop_references(method);
484 // create nmethod
485 nmethod* nm = NULL;
486 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
487 int nmethod_size =
488 CodeBlob::allocation_size(code_buffer, sizeof(nmethod))
489 + adjust_pcs_size(debug_info->pcs_size())
490 + round_to(dependencies->size_in_bytes() , oopSize)
491 + round_to(handler_table->size_in_bytes(), oopSize)
492 + round_to(nul_chk_table->size_in_bytes(), oopSize)
493 + round_to(debug_info->data_size() , oopSize);
494
495 nm = new (nmethod_size, comp_level)
496 nmethod(method(), compiler->type(), nmethod_size, compile_id, entry_bci, offsets,
497 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size,
498 oop_maps,
499 handler_table,
500 nul_chk_table,
501 compiler,
502 comp_level
503 #if INCLUDE_JVMCI
504 , installed_code,
505 speculationLog
506 #endif
507 );
508
509 if (nm != NULL) {
510 // To make dependency checking during class loading fast, record
511 // the nmethod dependencies in the classes it is dependent on.
512 // This allows the dependency checking code to simply walk the
513 // class hierarchy above the loaded class, checking only nmethods
514 // which are dependent on those classes. The slow way is to
515 // check every nmethod for dependencies which makes it linear in
516 // the number of methods compiled. For applications with a lot
517 // classes the slow way is too slow.
518 for (Dependencies::DepStream deps(nm); deps.next(); ) {
519 if (deps.type() == Dependencies::call_site_target_value) {
520 // CallSite dependencies are managed on per-CallSite instance basis.
521 oop call_site = deps.argument_oop(0);
522 MethodHandles::add_dependent_nmethod(call_site, nm);
523 } else {
524 Klass* klass = deps.context_type();
525 if (klass == NULL) {
526 continue; // ignore things like evol_method
527 }
528 // record this nmethod as dependent on this klass
529 InstanceKlass::cast(klass)->add_dependent_nmethod(nm);
530 }
531 }
532 NOT_PRODUCT(if (nm != NULL) note_java_nmethod(nm));
533 }
534 }
535 // Do verification and logging outside CodeCache_lock.
536 if (nm != NULL) {
537 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
538 DEBUG_ONLY(nm->verify();)
539 nm->log_new_nmethod();
540 }
541 return nm;
542 }
543
544 // For native wrappers
545 nmethod::nmethod(
546 Method* method,
547 CompilerType type,
548 int nmethod_size,
549 int compile_id,
550 CodeOffsets* offsets,
551 CodeBuffer* code_buffer,
552 int frame_size,
553 ByteSize basic_lock_owner_sp_offset,
554 ByteSize basic_lock_sp_offset,
555 OopMapSet* oop_maps )
556 : CompiledMethod(method, "native nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false),
557 _native_receiver_sp_offset(basic_lock_owner_sp_offset),
558 _native_basic_lock_sp_offset(basic_lock_sp_offset)
559 {
560 {
561 int scopes_data_offset = 0;
562 int deoptimize_offset = 0;
563 int deoptimize_mh_offset = 0;
564
565 debug_only(NoSafepointVerifier nsv;)
566 assert_locked_or_safepoint(CodeCache_lock);
567
568 init_defaults();
569 _entry_bci = InvocationEntryBci;
570 // We have no exception handler or deopt handler make the
571 // values something that will never match a pc like the nmethod vtable entry
572 _exception_offset = 0;
573 _orig_pc_offset = 0;
574
575 _consts_offset = data_offset();
576 _stub_offset = data_offset();
577 _oops_offset = data_offset();
578 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize);
579 scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize);
580 _scopes_pcs_offset = scopes_data_offset;
581 _dependencies_offset = _scopes_pcs_offset;
582 _handler_table_offset = _dependencies_offset;
583 _nul_chk_table_offset = _handler_table_offset;
584 _nmethod_end_offset = _nul_chk_table_offset;
585 _compile_id = compile_id;
586 _comp_level = CompLevel_none;
587 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
588 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
589 _osr_entry_point = NULL;
590 _exception_cache = NULL;
591 _pc_desc_container.reset_to(NULL);
592 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
593
594 _scopes_data_begin = (address) this + scopes_data_offset;
595 _deopt_handler_begin = (address) this + deoptimize_offset;
596 _deopt_mh_handler_begin = (address) this + deoptimize_mh_offset;
597
598 code_buffer->copy_code_and_locs_to(this);
599 code_buffer->copy_values_to(this);
600 if (ScavengeRootsInCode) {
601 if (detect_scavenge_root_oops()) {
602 CodeCache::add_scavenge_root_nmethod(this);
603 }
604 Universe::heap()->register_nmethod(this);
605 }
606 debug_only(verify_scavenge_root_oops());
607 CodeCache::commit(this);
608 }
609
610 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
611 ttyLocker ttyl; // keep the following output all in one block
612 // This output goes directly to the tty, not the compiler log.
613 // To enable tools to match it up with the compilation activity,
614 // be sure to tag this tty output with the compile ID.
615 if (xtty != NULL) {
616 xtty->begin_head("print_native_nmethod");
617 xtty->method(_method);
618 xtty->stamp();
619 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
620 }
621 // print the header part first
622 print();
623 // then print the requested information
624 if (PrintNativeNMethods) {
625 print_code();
626 if (oop_maps != NULL) {
627 oop_maps->print();
628 }
629 }
630 if (PrintRelocations) {
631 print_relocations();
632 }
633 if (xtty != NULL) {
634 xtty->tail("print_native_nmethod");
635 }
636 }
637 }
638
639 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () {
640 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level));
641 }
642
643 nmethod::nmethod(
644 Method* method,
645 CompilerType type,
646 int nmethod_size,
647 int compile_id,
648 int entry_bci,
649 CodeOffsets* offsets,
650 int orig_pc_offset,
651 DebugInformationRecorder* debug_info,
652 Dependencies* dependencies,
653 CodeBuffer *code_buffer,
654 int frame_size,
655 OopMapSet* oop_maps,
656 ExceptionHandlerTable* handler_table,
657 ImplicitExceptionTable* nul_chk_table,
658 AbstractCompiler* compiler,
659 int comp_level
660 #if INCLUDE_JVMCI
661 , Handle installed_code,
662 Handle speculation_log
663 #endif
664 )
665 : CompiledMethod(method, "nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false),
666 _native_receiver_sp_offset(in_ByteSize(-1)),
667 _native_basic_lock_sp_offset(in_ByteSize(-1))
668 {
669 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
670 {
671 debug_only(NoSafepointVerifier nsv;)
672 assert_locked_or_safepoint(CodeCache_lock);
673
674 _deopt_handler_begin = (address) this;
675 _deopt_mh_handler_begin = (address) this;
676
677 init_defaults();
678 _entry_bci = entry_bci;
679 _compile_id = compile_id;
680 _comp_level = comp_level;
681 _orig_pc_offset = orig_pc_offset;
682 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
683
684 // Section offsets
685 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts());
686 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs());
687 set_ctable_begin(header_begin() + _consts_offset);
688
689 #if INCLUDE_JVMCI
690 _jvmci_installed_code = installed_code();
691 _speculation_log = (instanceOop)speculation_log();
692
693 if (compiler->is_jvmci()) {
694 // JVMCI might not produce any stub sections
695 if (offsets->value(CodeOffsets::Exceptions) != -1) {
696 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions);
697 } else {
698 _exception_offset = -1;
699 }
700 if (offsets->value(CodeOffsets::Deopt) != -1) {
701 _deopt_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::Deopt);
702 } else {
703 _deopt_handler_begin = NULL;
704 }
705 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
706 _deopt_mh_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::DeoptMH);
707 } else {
708 _deopt_mh_handler_begin = NULL;
709 }
710 } else {
711 #endif
712 // Exception handler and deopt handler are in the stub section
713 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set");
714 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set");
715
716 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
717 _deopt_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::Deopt);
718 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
719 _deopt_mh_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::DeoptMH);
720 } else {
721 _deopt_mh_handler_begin = NULL;
722 #if INCLUDE_JVMCI
723 }
724 #endif
725 }
726 if (offsets->value(CodeOffsets::UnwindHandler) != -1) {
727 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler);
728 } else {
729 _unwind_handler_offset = -1;
730 }
731
732 _oops_offset = data_offset();
733 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize);
734 int scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize);
735
736 _scopes_pcs_offset = scopes_data_offset + round_to(debug_info->data_size (), oopSize);
737 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
738 _handler_table_offset = _dependencies_offset + round_to(dependencies->size_in_bytes (), oopSize);
739 _nul_chk_table_offset = _handler_table_offset + round_to(handler_table->size_in_bytes(), oopSize);
740 _nmethod_end_offset = _nul_chk_table_offset + round_to(nul_chk_table->size_in_bytes(), oopSize);
741 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
742 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
743 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry);
744 _exception_cache = NULL;
745
746 _scopes_data_begin = (address) this + scopes_data_offset;
747
748 _pc_desc_container.reset_to(scopes_pcs_begin());
749
750 code_buffer->copy_code_and_locs_to(this);
751 // Copy contents of ScopeDescRecorder to nmethod
752 code_buffer->copy_values_to(this);
753 debug_info->copy_to(this);
754 dependencies->copy_to(this);
755 if (ScavengeRootsInCode) {
756 if (detect_scavenge_root_oops()) {
757 CodeCache::add_scavenge_root_nmethod(this);
758 }
759 Universe::heap()->register_nmethod(this);
760 }
761 debug_only(verify_scavenge_root_oops());
762
763 CodeCache::commit(this);
764
765 // Copy contents of ExceptionHandlerTable to nmethod
766 handler_table->copy_to(this);
767 nul_chk_table->copy_to(this);
768
769 // we use the information of entry points to find out if a method is
770 // static or non static
771 assert(compiler->is_c2() || compiler->is_jvmci() ||
772 _method->is_static() == (entry_point() == _verified_entry_point),
773 " entry points must be same for static methods and vice versa");
774 }
775 }
776
777 // Print a short set of xml attributes to identify this nmethod. The
778 // output should be embedded in some other element.
779 void nmethod::log_identity(xmlStream* log) const {
780 log->print(" compile_id='%d'", compile_id());
781 const char* nm_kind = compile_kind();
782 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind);
783 log->print(" compiler='%s'", compiler_name());
784 if (TieredCompilation) {
785 log->print(" level='%d'", comp_level());
786 }
787 }
788
789
790 #define LOG_OFFSET(log, name) \
791 if (p2i(name##_end()) - p2i(name##_begin())) \
792 log->print(" " XSTR(name) "_offset='" INTX_FORMAT "'" , \
793 p2i(name##_begin()) - p2i(this))
794
795
796 void nmethod::log_new_nmethod() const {
797 if (LogCompilation && xtty != NULL) {
798 ttyLocker ttyl;
799 HandleMark hm;
800 xtty->begin_elem("nmethod");
801 log_identity(xtty);
802 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size());
803 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this));
804
805 LOG_OFFSET(xtty, relocation);
806 LOG_OFFSET(xtty, consts);
807 LOG_OFFSET(xtty, insts);
808 LOG_OFFSET(xtty, stub);
809 LOG_OFFSET(xtty, scopes_data);
810 LOG_OFFSET(xtty, scopes_pcs);
811 LOG_OFFSET(xtty, dependencies);
812 LOG_OFFSET(xtty, handler_table);
813 LOG_OFFSET(xtty, nul_chk_table);
814 LOG_OFFSET(xtty, oops);
815 LOG_OFFSET(xtty, metadata);
816
817 xtty->method(method());
818 xtty->stamp();
819 xtty->end_elem();
820 }
821 }
822
823 #undef LOG_OFFSET
824
825
826 // Print out more verbose output usually for a newly created nmethod.
827 void nmethod::print_on(outputStream* st, const char* msg) const {
828 if (st != NULL) {
829 ttyLocker ttyl;
830 if (WizardMode) {
831 CompileTask::print(st, this, msg, /*short_form:*/ true);
832 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this));
833 } else {
834 CompileTask::print(st, this, msg, /*short_form:*/ false);
835 }
836 }
837 }
838
839 void nmethod::maybe_print_nmethod(DirectiveSet* directive) {
840 bool printnmethods = directive->PrintAssemblyOption || directive->PrintNMethodsOption;
841 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
842 print_nmethod(printnmethods);
843 }
844 }
845
846 void nmethod::print_nmethod(bool printmethod) {
847 ttyLocker ttyl; // keep the following output all in one block
848 if (xtty != NULL) {
849 xtty->begin_head("print_nmethod");
850 xtty->stamp();
851 xtty->end_head();
852 }
853 // print the header part first
854 print();
855 // then print the requested information
856 if (printmethod) {
857 print_code();
858 print_pcs();
859 if (oop_maps()) {
860 oop_maps()->print();
861 }
862 }
863 if (printmethod || PrintDebugInfo || CompilerOracle::has_option_string(_method, "PrintDebugInfo")) {
864 print_scopes();
865 }
866 if (printmethod || PrintRelocations || CompilerOracle::has_option_string(_method, "PrintRelocations")) {
867 print_relocations();
868 }
869 if (printmethod || PrintDependencies || CompilerOracle::has_option_string(_method, "PrintDependencies")) {
870 print_dependencies();
871 }
872 if (printmethod || PrintExceptionHandlers) {
873 print_handler_table();
874 print_nul_chk_table();
875 }
876 if (printmethod) {
877 print_recorded_oops();
878 print_recorded_metadata();
879 }
880 if (xtty != NULL) {
881 xtty->tail("print_nmethod");
882 }
883 }
884
885
886 // Promote one word from an assembly-time handle to a live embedded oop.
887 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
888 if (handle == NULL ||
889 // As a special case, IC oops are initialized to 1 or -1.
890 handle == (jobject) Universe::non_oop_word()) {
891 (*dest) = (oop) handle;
892 } else {
893 (*dest) = JNIHandles::resolve_non_null(handle);
894 }
895 }
896
897
898 // Have to have the same name because it's called by a template
899 void nmethod::copy_values(GrowableArray<jobject>* array) {
900 int length = array->length();
901 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
902 oop* dest = oops_begin();
903 for (int index = 0 ; index < length; index++) {
904 initialize_immediate_oop(&dest[index], array->at(index));
905 }
906
907 // Now we can fix up all the oops in the code. We need to do this
908 // in the code because the assembler uses jobjects as placeholders.
909 // The code and relocations have already been initialized by the
910 // CodeBlob constructor, so it is valid even at this early point to
911 // iterate over relocations and patch the code.
912 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true);
913 }
914
915 void nmethod::copy_values(GrowableArray<Metadata*>* array) {
916 int length = array->length();
917 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough");
918 Metadata** dest = metadata_begin();
919 for (int index = 0 ; index < length; index++) {
920 dest[index] = array->at(index);
921 }
922 }
923
924 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) {
925 // re-patch all oop-bearing instructions, just in case some oops moved
926 RelocIterator iter(this, begin, end);
927 while (iter.next()) {
928 if (iter.type() == relocInfo::oop_type) {
929 oop_Relocation* reloc = iter.oop_reloc();
930 if (initialize_immediates && reloc->oop_is_immediate()) {
931 oop* dest = reloc->oop_addr();
932 initialize_immediate_oop(dest, (jobject) *dest);
933 }
934 // Refresh the oop-related bits of this instruction.
935 reloc->fix_oop_relocation();
936 } else if (iter.type() == relocInfo::metadata_type) {
937 metadata_Relocation* reloc = iter.metadata_reloc();
938 reloc->fix_metadata_relocation();
939 }
940 }
941 }
942
943
944 void nmethod::verify_clean_inline_caches() {
945 assert_locked_or_safepoint(CompiledIC_lock);
946
947 // If the method is not entrant or zombie then a JMP is plastered over the
948 // first few bytes. If an oop in the old code was there, that oop
949 // should not get GC'd. Skip the first few bytes of oops on
950 // not-entrant methods.
951 address low_boundary = verified_entry_point();
952 if (!is_in_use()) {
953 low_boundary += NativeJump::instruction_size;
954 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
955 // This means that the low_boundary is going to be a little too high.
956 // This shouldn't matter, since oops of non-entrant methods are never used.
957 // In fact, why are we bothering to look at oops in a non-entrant method??
958 }
959
960 ResourceMark rm;
961 RelocIterator iter(this, low_boundary);
962 while(iter.next()) {
963 switch(iter.type()) {
964 case relocInfo::virtual_call_type:
965 case relocInfo::opt_virtual_call_type: {
966 CompiledIC *ic = CompiledIC_at(&iter);
967 // Ok, to lookup references to zombies here
968 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
969 nmethod* nm = cb->as_nmethod_or_null();
970 if( nm != NULL ) {
971 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
972 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
973 assert(ic->is_clean(), "IC should be clean");
974 }
975 }
976 break;
977 }
978 case relocInfo::static_call_type: {
979 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
980 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
981 nmethod* nm = cb->as_nmethod_or_null();
982 if( nm != NULL ) {
983 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
984 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
985 assert(csc->is_clean(), "IC should be clean");
986 }
987 }
988 break;
989 }
990 }
991 }
992 }
993
994 // This is a private interface with the sweeper.
995 void nmethod::mark_as_seen_on_stack() {
996 assert(is_alive(), "Must be an alive method");
997 // Set the traversal mark to ensure that the sweeper does 2
998 // cleaning passes before moving to zombie.
999 set_stack_traversal_mark(NMethodSweeper::traversal_count());
1000 }
1001
1002 // Tell if a non-entrant method can be converted to a zombie (i.e.,
1003 // there are no activations on the stack, not in use by the VM,
1004 // and not in use by the ServiceThread)
1005 bool nmethod::can_convert_to_zombie() {
1006 assert(is_not_entrant(), "must be a non-entrant method");
1007
1008 // Since the nmethod sweeper only does partial sweep the sweeper's traversal
1009 // count can be greater than the stack traversal count before it hits the
1010 // nmethod for the second time.
1011 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count() &&
1012 !is_locked_by_vm();
1013 }
1014
1015 void nmethod::inc_decompile_count() {
1016 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return;
1017 // Could be gated by ProfileTraps, but do not bother...
1018 Method* m = method();
1019 if (m == NULL) return;
1020 MethodData* mdo = m->method_data();
1021 if (mdo == NULL) return;
1022 // There is a benign race here. See comments in methodData.hpp.
1023 mdo->inc_decompile_count();
1024 }
1025
1026 void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) {
1027
1028 post_compiled_method_unload();
1029
1030 // Since this nmethod is being unloaded, make sure that dependencies
1031 // recorded in instanceKlasses get flushed and pass non-NULL closure to
1032 // indicate that this work is being done during a GC.
1033 assert(Universe::heap()->is_gc_active(), "should only be called during gc");
1034 assert(is_alive != NULL, "Should be non-NULL");
1035 // A non-NULL is_alive closure indicates that this is being called during GC.
1036 flush_dependencies(is_alive);
1037
1038 // Break cycle between nmethod & method
1039 LogTarget(Trace, class, unload) lt;
1040 if (lt.is_enabled()) {
1041 LogStream ls(lt);
1042 ls.print_cr("making nmethod " INTPTR_FORMAT
1043 " unloadable, Method*(" INTPTR_FORMAT
1044 "), cause(" INTPTR_FORMAT ")",
1045 p2i(this), p2i(_method), p2i(cause));
1046 if (!Universe::heap()->is_gc_active())
1047 cause->klass()->print_on(&ls);
1048 }
1049 // Unlink the osr method, so we do not look this up again
1050 if (is_osr_method()) {
1051 // Invalidate the osr nmethod only once
1052 if (is_in_use()) {
1053 invalidate_osr_method();
1054 }
1055 #ifdef ASSERT
1056 if (method() != NULL) {
1057 // Make sure osr nmethod is invalidated, i.e. not on the list
1058 bool found = method()->method_holder()->remove_osr_nmethod(this);
1059 assert(!found, "osr nmethod should have been invalidated");
1060 }
1061 #endif
1062 }
1063
1064 // If _method is already NULL the Method* is about to be unloaded,
1065 // so we don't have to break the cycle. Note that it is possible to
1066 // have the Method* live here, in case we unload the nmethod because
1067 // it is pointing to some oop (other than the Method*) being unloaded.
1068 if (_method != NULL) {
1069 // OSR methods point to the Method*, but the Method* does not
1070 // point back!
1071 if (_method->code() == this) {
1072 _method->clear_code(); // Break a cycle
1073 }
1074 _method = NULL; // Clear the method of this dead nmethod
1075 }
1076
1077 // Make the class unloaded - i.e., change state and notify sweeper
1078 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
1079 if (is_in_use()) {
1080 // Transitioning directly from live to unloaded -- so
1081 // we need to force a cache clean-up; remember this
1082 // for later on.
1083 CodeCache::set_needs_cache_clean(true);
1084 }
1085
1086 // Unregister must be done before the state change
1087 Universe::heap()->unregister_nmethod(this);
1088
1089 _state = unloaded;
1090
1091 // Log the unloading.
1092 log_state_change();
1093
1094 #if INCLUDE_JVMCI
1095 // The method can only be unloaded after the pointer to the installed code
1096 // Java wrapper is no longer alive. Here we need to clear out this weak
1097 // reference to the dead object. Nulling out the reference has to happen
1098 // after the method is unregistered since the original value may be still
1099 // tracked by the rset.
1100 maybe_invalidate_installed_code();
1101 // Clear these out after the nmethod has been unregistered and any
1102 // updates to the InstalledCode instance have been performed.
1103 _jvmci_installed_code = NULL;
1104 _speculation_log = NULL;
1105 #endif
1106
1107 // The Method* is gone at this point
1108 assert(_method == NULL, "Tautology");
1109
1110 set_osr_link(NULL);
1111 NMethodSweeper::report_state_change(this);
1112 }
1113
1114 void nmethod::invalidate_osr_method() {
1115 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
1116 // Remove from list of active nmethods
1117 if (method() != NULL) {
1118 method()->method_holder()->remove_osr_nmethod(this);
1119 }
1120 }
1121
1122 void nmethod::log_state_change() const {
1123 if (LogCompilation) {
1124 if (xtty != NULL) {
1125 ttyLocker ttyl; // keep the following output all in one block
1126 if (_state == unloaded) {
1127 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'",
1128 os::current_thread_id());
1129 } else {
1130 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s",
1131 os::current_thread_id(),
1132 (_state == zombie ? " zombie='1'" : ""));
1133 }
1134 log_identity(xtty);
1135 xtty->stamp();
1136 xtty->end_elem();
1137 }
1138 }
1139
1140 const char *state_msg = _state == zombie ? "made zombie" : "made not entrant";
1141 CompileTask::print_ul(this, state_msg);
1142 if (PrintCompilation && _state != unloaded) {
1143 print_on(tty, state_msg);
1144 }
1145 }
1146
1147 /**
1148 * Common functionality for both make_not_entrant and make_zombie
1149 */
1150 bool nmethod::make_not_entrant_or_zombie(unsigned int state) {
1151 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant");
1152 assert(!is_zombie(), "should not already be a zombie");
1153
1154 if (_state == state) {
1155 // Avoid taking the lock if already in required state.
1156 // This is safe from races because the state is an end-state,
1157 // which the nmethod cannot back out of once entered.
1158 // No need for fencing either.
1159 return false;
1160 }
1161
1162 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below.
1163 nmethodLocker nml(this);
1164 methodHandle the_method(method());
1165 NoSafepointVerifier nsv;
1166
1167 // during patching, depending on the nmethod state we must notify the GC that
1168 // code has been unloaded, unregistering it. We cannot do this right while
1169 // holding the Patching_lock because we need to use the CodeCache_lock. This
1170 // would be prone to deadlocks.
1171 // This flag is used to remember whether we need to later lock and unregister.
1172 bool nmethod_needs_unregister = false;
1173
1174 {
1175 // invalidate osr nmethod before acquiring the patching lock since
1176 // they both acquire leaf locks and we don't want a deadlock.
1177 // This logic is equivalent to the logic below for patching the
1178 // verified entry point of regular methods. We check that the
1179 // nmethod is in use to ensure that it is invalidated only once.
1180 if (is_osr_method() && is_in_use()) {
1181 // this effectively makes the osr nmethod not entrant
1182 invalidate_osr_method();
1183 }
1184
1185 // Enter critical section. Does not block for safepoint.
1186 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1187
1188 if (_state == state) {
1189 // another thread already performed this transition so nothing
1190 // to do, but return false to indicate this.
1191 return false;
1192 }
1193
1194 // The caller can be calling the method statically or through an inline
1195 // cache call.
1196 if (!is_osr_method() && !is_not_entrant()) {
1197 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
1198 SharedRuntime::get_handle_wrong_method_stub());
1199 }
1200
1201 if (is_in_use() && update_recompile_counts()) {
1202 // It's a true state change, so mark the method as decompiled.
1203 // Do it only for transition from alive.
1204 inc_decompile_count();
1205 }
1206
1207 // If the state is becoming a zombie, signal to unregister the nmethod with
1208 // the heap.
1209 // This nmethod may have already been unloaded during a full GC.
1210 if ((state == zombie) && !is_unloaded()) {
1211 nmethod_needs_unregister = true;
1212 }
1213
1214 // Must happen before state change. Otherwise we have a race condition in
1215 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately
1216 // transition its state from 'not_entrant' to 'zombie' without having to wait
1217 // for stack scanning.
1218 if (state == not_entrant) {
1219 mark_as_seen_on_stack();
1220 OrderAccess::storestore();
1221 }
1222
1223 // Change state
1224 _state = state;
1225
1226 // Log the transition once
1227 log_state_change();
1228
1229 // Invalidate while holding the patching lock
1230 JVMCI_ONLY(maybe_invalidate_installed_code());
1231
1232 // Remove nmethod from method.
1233 // We need to check if both the _code and _from_compiled_code_entry_point
1234 // refer to this nmethod because there is a race in setting these two fields
1235 // in Method* as seen in bugid 4947125.
1236 // If the vep() points to the zombie nmethod, the memory for the nmethod
1237 // could be flushed and the compiler and vtable stubs could still call
1238 // through it.
1239 if (method() != NULL && (method()->code() == this ||
1240 method()->from_compiled_entry() == verified_entry_point())) {
1241 HandleMark hm;
1242 method()->clear_code(false /* already owns Patching_lock */);
1243 }
1244 } // leave critical region under Patching_lock
1245
1246 #ifdef ASSERT
1247 if (is_osr_method() && method() != NULL) {
1248 // Make sure osr nmethod is invalidated, i.e. not on the list
1249 bool found = method()->method_holder()->remove_osr_nmethod(this);
1250 assert(!found, "osr nmethod should have been invalidated");
1251 }
1252 #endif
1253
1254 // When the nmethod becomes zombie it is no longer alive so the
1255 // dependencies must be flushed. nmethods in the not_entrant
1256 // state will be flushed later when the transition to zombie
1257 // happens or they get unloaded.
1258 if (state == zombie) {
1259 {
1260 // Flushing dependencies must be done before any possible
1261 // safepoint can sneak in, otherwise the oops used by the
1262 // dependency logic could have become stale.
1263 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1264 if (nmethod_needs_unregister) {
1265 Universe::heap()->unregister_nmethod(this);
1266 #ifdef JVMCI
1267 _jvmci_installed_code = NULL;
1268 _speculation_log = NULL;
1269 #endif
1270 }
1271 flush_dependencies(NULL);
1272 }
1273
1274 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload
1275 // event and it hasn't already been reported for this nmethod then
1276 // report it now. The event may have been reported earlier if the GC
1277 // marked it for unloading). JvmtiDeferredEventQueue support means
1278 // we no longer go to a safepoint here.
1279 post_compiled_method_unload();
1280
1281 #ifdef ASSERT
1282 // It's no longer safe to access the oops section since zombie
1283 // nmethods aren't scanned for GC.
1284 _oops_are_stale = true;
1285 #endif
1286 // the Method may be reclaimed by class unloading now that the
1287 // nmethod is in zombie state
1288 set_method(NULL);
1289 } else {
1290 assert(state == not_entrant, "other cases may need to be handled differently");
1291 }
1292
1293 if (TraceCreateZombies) {
1294 ResourceMark m;
1295 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");
1296 }
1297
1298 NMethodSweeper::report_state_change(this);
1299 return true;
1300 }
1301
1302 void nmethod::flush() {
1303 // Note that there are no valid oops in the nmethod anymore.
1304 assert(!is_osr_method() || is_unloaded() || is_zombie(),
1305 "osr nmethod must be unloaded or zombie before flushing");
1306 assert(is_zombie() || is_osr_method(), "must be a zombie method");
1307 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed");
1308 assert_locked_or_safepoint(CodeCache_lock);
1309
1310 // completely deallocate this method
1311 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, p2i(this));
1312 if (PrintMethodFlushing) {
1313 tty->print_cr("*flushing %s nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT
1314 "/Free CodeCache:" SIZE_FORMAT "Kb",
1315 is_osr_method() ? "osr" : "",_compile_id, p2i(this), CodeCache::blob_count(),
1316 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024);
1317 }
1318
1319 // We need to deallocate any ExceptionCache data.
1320 // Note that we do not need to grab the nmethod lock for this, it
1321 // better be thread safe if we're disposing of it!
1322 ExceptionCache* ec = exception_cache();
1323 set_exception_cache(NULL);
1324 while(ec != NULL) {
1325 ExceptionCache* next = ec->next();
1326 delete ec;
1327 ec = next;
1328 }
1329
1330 if (on_scavenge_root_list()) {
1331 CodeCache::drop_scavenge_root_nmethod(this);
1332 }
1333
1334 #ifdef SHARK
1335 ((SharkCompiler *) compiler())->free_compiled_method(insts_begin());
1336 #endif // SHARK
1337
1338 CodeBlob::flush();
1339 CodeCache::free(this);
1340 }
1341
1342 //
1343 // Notify all classes this nmethod is dependent on that it is no
1344 // longer dependent. This should only be called in two situations.
1345 // First, when a nmethod transitions to a zombie all dependents need
1346 // to be clear. Since zombification happens at a safepoint there's no
1347 // synchronization issues. The second place is a little more tricky.
1348 // During phase 1 of mark sweep class unloading may happen and as a
1349 // result some nmethods may get unloaded. In this case the flushing
1350 // of dependencies must happen during phase 1 since after GC any
1351 // dependencies in the unloaded nmethod won't be updated, so
1352 // traversing the dependency information in unsafe. In that case this
1353 // function is called with a non-NULL argument and this function only
1354 // notifies instanceKlasses that are reachable
1355
1356 void nmethod::flush_dependencies(BoolObjectClosure* is_alive) {
1357 assert_locked_or_safepoint(CodeCache_lock);
1358 assert(Universe::heap()->is_gc_active() == (is_alive != NULL),
1359 "is_alive is non-NULL if and only if we are called during GC");
1360 if (!has_flushed_dependencies()) {
1361 set_has_flushed_dependencies();
1362 for (Dependencies::DepStream deps(this); deps.next(); ) {
1363 if (deps.type() == Dependencies::call_site_target_value) {
1364 // CallSite dependencies are managed on per-CallSite instance basis.
1365 oop call_site = deps.argument_oop(0);
1366 MethodHandles::remove_dependent_nmethod(call_site, this);
1367 } else {
1368 Klass* klass = deps.context_type();
1369 if (klass == NULL) {
1370 continue; // ignore things like evol_method
1371 }
1372 // During GC the is_alive closure is non-NULL, and is used to
1373 // determine liveness of dependees that need to be updated.
1374 if (is_alive == NULL || klass->is_loader_alive(is_alive)) {
1375 // The GC defers deletion of this entry, since there might be multiple threads
1376 // iterating over the _dependencies graph. Other call paths are single-threaded
1377 // and may delete it immediately.
1378 bool delete_immediately = is_alive == NULL;
1379 InstanceKlass::cast(klass)->remove_dependent_nmethod(this, delete_immediately);
1380 }
1381 }
1382 }
1383 }
1384 }
1385
1386
1387 // If this oop is not live, the nmethod can be unloaded.
1388 bool nmethod::can_unload(BoolObjectClosure* is_alive, oop* root, bool unloading_occurred) {
1389 assert(root != NULL, "just checking");
1390 oop obj = *root;
1391 if (obj == NULL || is_alive->do_object_b(obj)) {
1392 return false;
1393 }
1394
1395 // If ScavengeRootsInCode is true, an nmethod might be unloaded
1396 // simply because one of its constant oops has gone dead.
1397 // No actual classes need to be unloaded in order for this to occur.
1398 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading");
1399 make_unloaded(is_alive, obj);
1400 return true;
1401 }
1402
1403 // ------------------------------------------------------------------
1404 // post_compiled_method_load_event
1405 // new method for install_code() path
1406 // Transfer information from compilation to jvmti
1407 void nmethod::post_compiled_method_load_event() {
1408
1409 Method* moop = method();
1410 HOTSPOT_COMPILED_METHOD_LOAD(
1411 (char *) moop->klass_name()->bytes(),
1412 moop->klass_name()->utf8_length(),
1413 (char *) moop->name()->bytes(),
1414 moop->name()->utf8_length(),
1415 (char *) moop->signature()->bytes(),
1416 moop->signature()->utf8_length(),
1417 insts_begin(), insts_size());
1418
1419 if (JvmtiExport::should_post_compiled_method_load() ||
1420 JvmtiExport::should_post_compiled_method_unload()) {
1421 get_and_cache_jmethod_id();
1422 }
1423
1424 if (JvmtiExport::should_post_compiled_method_load()) {
1425 // Let the Service thread (which is a real Java thread) post the event
1426 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1427 JvmtiDeferredEventQueue::enqueue(
1428 JvmtiDeferredEvent::compiled_method_load_event(this));
1429 }
1430 }
1431
1432 jmethodID nmethod::get_and_cache_jmethod_id() {
1433 if (_jmethod_id == NULL) {
1434 // Cache the jmethod_id since it can no longer be looked up once the
1435 // method itself has been marked for unloading.
1436 _jmethod_id = method()->jmethod_id();
1437 }
1438 return _jmethod_id;
1439 }
1440
1441 void nmethod::post_compiled_method_unload() {
1442 if (unload_reported()) {
1443 // During unloading we transition to unloaded and then to zombie
1444 // and the unloading is reported during the first transition.
1445 return;
1446 }
1447
1448 assert(_method != NULL && !is_unloaded(), "just checking");
1449 DTRACE_METHOD_UNLOAD_PROBE(method());
1450
1451 // If a JVMTI agent has enabled the CompiledMethodUnload event then
1452 // post the event. Sometime later this nmethod will be made a zombie
1453 // by the sweeper but the Method* will not be valid at that point.
1454 // If the _jmethod_id is null then no load event was ever requested
1455 // so don't bother posting the unload. The main reason for this is
1456 // that the jmethodID is a weak reference to the Method* so if
1457 // it's being unloaded there's no way to look it up since the weak
1458 // ref will have been cleared.
1459 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) {
1460 assert(!unload_reported(), "already unloaded");
1461 JvmtiDeferredEvent event =
1462 JvmtiDeferredEvent::compiled_method_unload_event(this,
1463 _jmethod_id, insts_begin());
1464 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1465 JvmtiDeferredEventQueue::enqueue(event);
1466 }
1467
1468 // The JVMTI CompiledMethodUnload event can be enabled or disabled at
1469 // any time. As the nmethod is being unloaded now we mark it has
1470 // having the unload event reported - this will ensure that we don't
1471 // attempt to report the event in the unlikely scenario where the
1472 // event is enabled at the time the nmethod is made a zombie.
1473 set_unload_reported();
1474 }
1475
1476 bool nmethod::unload_if_dead_at(RelocIterator* iter_at_oop, BoolObjectClosure *is_alive, bool unloading_occurred) {
1477 assert(iter_at_oop->type() == relocInfo::oop_type, "Wrong relocation type");
1478
1479 oop_Relocation* r = iter_at_oop->oop_reloc();
1480 // Traverse those oops directly embedded in the code.
1481 // Other oops (oop_index>0) are seen as part of scopes_oops.
1482 assert(1 == (r->oop_is_immediate()) +
1483 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1484 "oop must be found in exactly one place");
1485 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1486 // Unload this nmethod if the oop is dead.
1487 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) {
1488 return true;;
1489 }
1490 }
1491
1492 return false;
1493 }
1494
1495 bool nmethod::do_unloading_scopes(BoolObjectClosure* is_alive, bool unloading_occurred) {
1496 // Scopes
1497 for (oop* p = oops_begin(); p < oops_end(); p++) {
1498 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1499 if (can_unload(is_alive, p, unloading_occurred)) {
1500 return true;
1501 }
1502 }
1503 return false;
1504 }
1505
1506 bool nmethod::do_unloading_oops(address low_boundary, BoolObjectClosure* is_alive, bool unloading_occurred) {
1507 // Compiled code
1508 {
1509 RelocIterator iter(this, low_boundary);
1510 while (iter.next()) {
1511 if (iter.type() == relocInfo::oop_type) {
1512 if (unload_if_dead_at(&iter, is_alive, unloading_occurred)) {
1513 return true;
1514 }
1515 }
1516 }
1517 }
1518
1519 return do_unloading_scopes(is_alive, unloading_occurred);
1520 }
1521
1522 #if INCLUDE_JVMCI
1523 bool nmethod::do_unloading_jvmci(BoolObjectClosure* is_alive, bool unloading_occurred) {
1524 bool is_unloaded = false;
1525 // Follow JVMCI method
1526 BarrierSet* bs = Universe::heap()->barrier_set();
1527 if (_jvmci_installed_code != NULL) {
1528 if (_jvmci_installed_code->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(_jvmci_installed_code)) {
1529 if (!is_alive->do_object_b(_jvmci_installed_code)) {
1530 clear_jvmci_installed_code();
1531 }
1532 } else {
1533 if (can_unload(is_alive, (oop*)&_jvmci_installed_code, unloading_occurred)) {
1534 return true;
1535 }
1536 }
1537 }
1538
1539 if (_speculation_log != NULL) {
1540 if (!is_alive->do_object_b(_speculation_log)) {
1541 bs->write_ref_nmethod_pre(&_speculation_log, this);
1542 _speculation_log = NULL;
1543 bs->write_ref_nmethod_post(&_speculation_log, this);
1544 }
1545 }
1546 return is_unloaded;
1547 }
1548 #endif
1549
1550 // Iterate over metadata calling this function. Used by RedefineClasses
1551 void nmethod::metadata_do(void f(Metadata*)) {
1552 address low_boundary = verified_entry_point();
1553 if (is_not_entrant()) {
1554 low_boundary += NativeJump::instruction_size;
1555 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1556 // (See comment above.)
1557 }
1558 {
1559 // Visit all immediate references that are embedded in the instruction stream.
1560 RelocIterator iter(this, low_boundary);
1561 while (iter.next()) {
1562 if (iter.type() == relocInfo::metadata_type ) {
1563 metadata_Relocation* r = iter.metadata_reloc();
1564 // In this metadata, we must only follow those metadatas directly embedded in
1565 // the code. Other metadatas (oop_index>0) are seen as part of
1566 // the metadata section below.
1567 assert(1 == (r->metadata_is_immediate()) +
1568 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
1569 "metadata must be found in exactly one place");
1570 if (r->metadata_is_immediate() && r->metadata_value() != NULL) {
1571 Metadata* md = r->metadata_value();
1572 if (md != _method) f(md);
1573 }
1574 } else if (iter.type() == relocInfo::virtual_call_type) {
1575 // Check compiledIC holders associated with this nmethod
1576 CompiledIC *ic = CompiledIC_at(&iter);
1577 if (ic->is_icholder_call()) {
1578 CompiledICHolder* cichk = ic->cached_icholder();
1579 f(cichk->holder_method());
1580 f(cichk->holder_klass());
1581 } else {
1582 Metadata* ic_oop = ic->cached_metadata();
1583 if (ic_oop != NULL) {
1584 f(ic_oop);
1585 }
1586 }
1587 }
1588 }
1589 }
1590
1591 // Visit the metadata section
1592 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
1593 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops
1594 Metadata* md = *p;
1595 f(md);
1596 }
1597
1598 // Visit metadata not embedded in the other places.
1599 if (_method != NULL) f(_method);
1600 }
1601
1602 void nmethod::oops_do(OopClosure* f, bool allow_zombie) {
1603 // make sure the oops ready to receive visitors
1604 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod");
1605 assert(!is_unloaded(), "should not call follow on unloaded nmethod");
1606
1607 // If the method is not entrant or zombie then a JMP is plastered over the
1608 // first few bytes. If an oop in the old code was there, that oop
1609 // should not get GC'd. Skip the first few bytes of oops on
1610 // not-entrant methods.
1611 address low_boundary = verified_entry_point();
1612 if (is_not_entrant()) {
1613 low_boundary += NativeJump::instruction_size;
1614 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1615 // (See comment above.)
1616 }
1617
1618 #if INCLUDE_JVMCI
1619 if (_jvmci_installed_code != NULL) {
1620 f->do_oop((oop*) &_jvmci_installed_code);
1621 }
1622 if (_speculation_log != NULL) {
1623 f->do_oop((oop*) &_speculation_log);
1624 }
1625 #endif
1626
1627 RelocIterator iter(this, low_boundary);
1628
1629 while (iter.next()) {
1630 if (iter.type() == relocInfo::oop_type ) {
1631 oop_Relocation* r = iter.oop_reloc();
1632 // In this loop, we must only follow those oops directly embedded in
1633 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1634 assert(1 == (r->oop_is_immediate()) +
1635 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1636 "oop must be found in exactly one place");
1637 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1638 f->do_oop(r->oop_addr());
1639 }
1640 }
1641 }
1642
1643 // Scopes
1644 // This includes oop constants not inlined in the code stream.
1645 for (oop* p = oops_begin(); p < oops_end(); p++) {
1646 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1647 f->do_oop(p);
1648 }
1649 }
1650
1651 #define NMETHOD_SENTINEL ((nmethod*)badAddress)
1652
1653 nmethod* volatile nmethod::_oops_do_mark_nmethods;
1654
1655 // An nmethod is "marked" if its _mark_link is set non-null.
1656 // Even if it is the end of the linked list, it will have a non-null link value,
1657 // as long as it is on the list.
1658 // This code must be MP safe, because it is used from parallel GC passes.
1659 bool nmethod::test_set_oops_do_mark() {
1660 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");
1661 nmethod* observed_mark_link = _oops_do_mark_link;
1662 if (observed_mark_link == NULL) {
1663 // Claim this nmethod for this thread to mark.
1664 observed_mark_link = (nmethod*)
1665 Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_link, NULL);
1666 if (observed_mark_link == NULL) {
1667
1668 // Atomically append this nmethod (now claimed) to the head of the list:
1669 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods;
1670 for (;;) {
1671 nmethod* required_mark_nmethods = observed_mark_nmethods;
1672 _oops_do_mark_link = required_mark_nmethods;
1673 observed_mark_nmethods = (nmethod*)
1674 Atomic::cmpxchg_ptr(this, &_oops_do_mark_nmethods, required_mark_nmethods);
1675 if (observed_mark_nmethods == required_mark_nmethods)
1676 break;
1677 }
1678 // Mark was clear when we first saw this guy.
1679 if (TraceScavenge) { print_on(tty, "oops_do, mark"); }
1680 return false;
1681 }
1682 }
1683 // On fall through, another racing thread marked this nmethod before we did.
1684 return true;
1685 }
1686
1687 void nmethod::oops_do_marking_prologue() {
1688 if (TraceScavenge) { tty->print_cr("[oops_do_marking_prologue"); }
1689 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row");
1690 // We use cmpxchg_ptr instead of regular assignment here because the user
1691 // may fork a bunch of threads, and we need them all to see the same state.
1692 void* observed = Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, NULL);
1693 guarantee(observed == NULL, "no races in this sequential code");
1694 }
1695
1696 void nmethod::oops_do_marking_epilogue() {
1697 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row");
1698 nmethod* cur = _oops_do_mark_nmethods;
1699 while (cur != NMETHOD_SENTINEL) {
1700 assert(cur != NULL, "not NULL-terminated");
1701 nmethod* next = cur->_oops_do_mark_link;
1702 cur->_oops_do_mark_link = NULL;
1703 DEBUG_ONLY(cur->verify_oop_relocations());
1704 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark"));
1705 cur = next;
1706 }
1707 void* required = _oops_do_mark_nmethods;
1708 void* observed = Atomic::cmpxchg_ptr(NULL, &_oops_do_mark_nmethods, required);
1709 guarantee(observed == required, "no races in this sequential code");
1710 if (TraceScavenge) { tty->print_cr("oops_do_marking_epilogue]"); }
1711 }
1712
1713 class DetectScavengeRoot: public OopClosure {
1714 bool _detected_scavenge_root;
1715 public:
1716 DetectScavengeRoot() : _detected_scavenge_root(false)
1717 { NOT_PRODUCT(_print_nm = NULL); }
1718 bool detected_scavenge_root() { return _detected_scavenge_root; }
1719 virtual void do_oop(oop* p) {
1720 if ((*p) != NULL && (*p)->is_scavengable()) {
1721 NOT_PRODUCT(maybe_print(p));
1722 _detected_scavenge_root = true;
1723 }
1724 }
1725 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
1726
1727 #ifndef PRODUCT
1728 nmethod* _print_nm;
1729 void maybe_print(oop* p) {
1730 if (_print_nm == NULL) return;
1731 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root");
1732 tty->print_cr("" PTR_FORMAT "[offset=%d] detected scavengable oop " PTR_FORMAT " (found at " PTR_FORMAT ")",
1733 p2i(_print_nm), (int)((intptr_t)p - (intptr_t)_print_nm),
1734 p2i(*p), p2i(p));
1735 (*p)->print();
1736 }
1737 #endif //PRODUCT
1738 };
1739
1740 bool nmethod::detect_scavenge_root_oops() {
1741 DetectScavengeRoot detect_scavenge_root;
1742 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this);
1743 oops_do(&detect_scavenge_root);
1744 return detect_scavenge_root.detected_scavenge_root();
1745 }
1746
1747 inline bool includes(void* p, void* from, void* to) {
1748 return from <= p && p < to;
1749 }
1750
1751
1752 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
1753 assert(count >= 2, "must be sentinel values, at least");
1754
1755 #ifdef ASSERT
1756 // must be sorted and unique; we do a binary search in find_pc_desc()
1757 int prev_offset = pcs[0].pc_offset();
1758 assert(prev_offset == PcDesc::lower_offset_limit,
1759 "must start with a sentinel");
1760 for (int i = 1; i < count; i++) {
1761 int this_offset = pcs[i].pc_offset();
1762 assert(this_offset > prev_offset, "offsets must be sorted");
1763 prev_offset = this_offset;
1764 }
1765 assert(prev_offset == PcDesc::upper_offset_limit,
1766 "must end with a sentinel");
1767 #endif //ASSERT
1768
1769 // Search for MethodHandle invokes and tag the nmethod.
1770 for (int i = 0; i < count; i++) {
1771 if (pcs[i].is_method_handle_invoke()) {
1772 set_has_method_handle_invokes(true);
1773 break;
1774 }
1775 }
1776 assert(has_method_handle_invokes() == (_deopt_mh_handler_begin != NULL), "must have deopt mh handler");
1777
1778 int size = count * sizeof(PcDesc);
1779 assert(scopes_pcs_size() >= size, "oob");
1780 memcpy(scopes_pcs_begin(), pcs, size);
1781
1782 // Adjust the final sentinel downward.
1783 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
1784 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
1785 last_pc->set_pc_offset(content_size() + 1);
1786 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
1787 // Fill any rounding gaps with copies of the last record.
1788 last_pc[1] = last_pc[0];
1789 }
1790 // The following assert could fail if sizeof(PcDesc) is not
1791 // an integral multiple of oopSize (the rounding term).
1792 // If it fails, change the logic to always allocate a multiple
1793 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
1794 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
1795 }
1796
1797 void nmethod::copy_scopes_data(u_char* buffer, int size) {
1798 assert(scopes_data_size() >= size, "oob");
1799 memcpy(scopes_data_begin(), buffer, size);
1800 }
1801
1802 #ifdef ASSERT
1803 static PcDesc* linear_search(const PcDescSearch& search, int pc_offset, bool approximate) {
1804 PcDesc* lower = search.scopes_pcs_begin();
1805 PcDesc* upper = search.scopes_pcs_end();
1806 lower += 1; // exclude initial sentinel
1807 PcDesc* res = NULL;
1808 for (PcDesc* p = lower; p < upper; p++) {
1809 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc
1810 if (match_desc(p, pc_offset, approximate)) {
1811 if (res == NULL)
1812 res = p;
1813 else
1814 res = (PcDesc*) badAddress;
1815 }
1816 }
1817 return res;
1818 }
1819 #endif
1820
1821
1822 // Finds a PcDesc with real-pc equal to "pc"
1823 PcDesc* PcDescContainer::find_pc_desc_internal(address pc, bool approximate, const PcDescSearch& search) {
1824 address base_address = search.code_begin();
1825 if ((pc < base_address) ||
1826 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
1827 return NULL; // PC is wildly out of range
1828 }
1829 int pc_offset = (int) (pc - base_address);
1830
1831 // Check the PcDesc cache if it contains the desired PcDesc
1832 // (This as an almost 100% hit rate.)
1833 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
1834 if (res != NULL) {
1835 assert(res == linear_search(search, pc_offset, approximate), "cache ok");
1836 return res;
1837 }
1838
1839 // Fallback algorithm: quasi-linear search for the PcDesc
1840 // Find the last pc_offset less than the given offset.
1841 // The successor must be the required match, if there is a match at all.
1842 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
1843 PcDesc* lower = search.scopes_pcs_begin();
1844 PcDesc* upper = search.scopes_pcs_end();
1845 upper -= 1; // exclude final sentinel
1846 if (lower >= upper) return NULL; // native method; no PcDescs at all
1847
1848 #define assert_LU_OK \
1849 /* invariant on lower..upper during the following search: */ \
1850 assert(lower->pc_offset() < pc_offset, "sanity"); \
1851 assert(upper->pc_offset() >= pc_offset, "sanity")
1852 assert_LU_OK;
1853
1854 // Use the last successful return as a split point.
1855 PcDesc* mid = _pc_desc_cache.last_pc_desc();
1856 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1857 if (mid->pc_offset() < pc_offset) {
1858 lower = mid;
1859 } else {
1860 upper = mid;
1861 }
1862
1863 // Take giant steps at first (4096, then 256, then 16, then 1)
1864 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
1865 const int RADIX = (1 << LOG2_RADIX);
1866 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
1867 while ((mid = lower + step) < upper) {
1868 assert_LU_OK;
1869 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1870 if (mid->pc_offset() < pc_offset) {
1871 lower = mid;
1872 } else {
1873 upper = mid;
1874 break;
1875 }
1876 }
1877 assert_LU_OK;
1878 }
1879
1880 // Sneak up on the value with a linear search of length ~16.
1881 while (true) {
1882 assert_LU_OK;
1883 mid = lower + 1;
1884 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1885 if (mid->pc_offset() < pc_offset) {
1886 lower = mid;
1887 } else {
1888 upper = mid;
1889 break;
1890 }
1891 }
1892 #undef assert_LU_OK
1893
1894 if (match_desc(upper, pc_offset, approximate)) {
1895 assert(upper == linear_search(search, pc_offset, approximate), "search ok");
1896 _pc_desc_cache.add_pc_desc(upper);
1897 return upper;
1898 } else {
1899 assert(NULL == linear_search(search, pc_offset, approximate), "search ok");
1900 return NULL;
1901 }
1902 }
1903
1904
1905 void nmethod::check_all_dependencies(DepChange& changes) {
1906 // Checked dependencies are allocated into this ResourceMark
1907 ResourceMark rm;
1908
1909 // Turn off dependency tracing while actually testing dependencies.
1910 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) );
1911
1912 typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash,
1913 &DependencySignature::equals, 11027> DepTable;
1914
1915 DepTable* table = new DepTable();
1916
1917 // Iterate over live nmethods and check dependencies of all nmethods that are not
1918 // marked for deoptimization. A particular dependency is only checked once.
1919 NMethodIterator iter;
1920 while(iter.next()) {
1921 nmethod* nm = iter.method();
1922 // Only notify for live nmethods
1923 if (nm->is_alive() && !nm->is_marked_for_deoptimization()) {
1924 for (Dependencies::DepStream deps(nm); deps.next(); ) {
1925 // Construct abstraction of a dependency.
1926 DependencySignature* current_sig = new DependencySignature(deps);
1927
1928 // Determine if dependency is already checked. table->put(...) returns
1929 // 'true' if the dependency is added (i.e., was not in the hashtable).
1930 if (table->put(*current_sig, 1)) {
1931 if (deps.check_dependency() != NULL) {
1932 // Dependency checking failed. Print out information about the failed
1933 // dependency and finally fail with an assert. We can fail here, since
1934 // dependency checking is never done in a product build.
1935 tty->print_cr("Failed dependency:");
1936 changes.print();
1937 nm->print();
1938 nm->print_dependencies();
1939 assert(false, "Should have been marked for deoptimization");
1940 }
1941 }
1942 }
1943 }
1944 }
1945 }
1946
1947 bool nmethod::check_dependency_on(DepChange& changes) {
1948 // What has happened:
1949 // 1) a new class dependee has been added
1950 // 2) dependee and all its super classes have been marked
1951 bool found_check = false; // set true if we are upset
1952 for (Dependencies::DepStream deps(this); deps.next(); ) {
1953 // Evaluate only relevant dependencies.
1954 if (deps.spot_check_dependency_at(changes) != NULL) {
1955 found_check = true;
1956 NOT_DEBUG(break);
1957 }
1958 }
1959 return found_check;
1960 }
1961
1962 bool nmethod::is_evol_dependent_on(Klass* dependee) {
1963 InstanceKlass *dependee_ik = InstanceKlass::cast(dependee);
1964 Array<Method*>* dependee_methods = dependee_ik->methods();
1965 for (Dependencies::DepStream deps(this); deps.next(); ) {
1966 if (deps.type() == Dependencies::evol_method) {
1967 Method* method = deps.method_argument(0);
1968 for (int j = 0; j < dependee_methods->length(); j++) {
1969 if (dependee_methods->at(j) == method) {
1970 if (log_is_enabled(Debug, redefine, class, nmethod)) {
1971 ResourceMark rm;
1972 log_debug(redefine, class, nmethod)
1973 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)",
1974 _method->method_holder()->external_name(),
1975 _method->name()->as_C_string(),
1976 _method->signature()->as_C_string(),
1977 compile_id(),
1978 method->method_holder()->external_name(),
1979 method->name()->as_C_string(),
1980 method->signature()->as_C_string());
1981 }
1982 if (TraceDependencies || LogCompilation)
1983 deps.log_dependency(dependee);
1984 return true;
1985 }
1986 }
1987 }
1988 }
1989 return false;
1990 }
1991
1992 // Called from mark_for_deoptimization, when dependee is invalidated.
1993 bool nmethod::is_dependent_on_method(Method* dependee) {
1994 for (Dependencies::DepStream deps(this); deps.next(); ) {
1995 if (deps.type() != Dependencies::evol_method)
1996 continue;
1997 Method* method = deps.method_argument(0);
1998 if (method == dependee) return true;
1999 }
2000 return false;
2001 }
2002
2003
2004 bool nmethod::is_patchable_at(address instr_addr) {
2005 assert(insts_contains(instr_addr), "wrong nmethod used");
2006 if (is_zombie()) {
2007 // a zombie may never be patched
2008 return false;
2009 }
2010 return true;
2011 }
2012
2013
2014 address nmethod::continuation_for_implicit_exception(address pc) {
2015 // Exception happened outside inline-cache check code => we are inside
2016 // an active nmethod => use cpc to determine a return address
2017 int exception_offset = pc - code_begin();
2018 int cont_offset = ImplicitExceptionTable(this).at( exception_offset );
2019 #ifdef ASSERT
2020 if (cont_offset == 0) {
2021 Thread* thread = Thread::current();
2022 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
2023 HandleMark hm(thread);
2024 ResourceMark rm(thread);
2025 CodeBlob* cb = CodeCache::find_blob(pc);
2026 assert(cb != NULL && cb == this, "");
2027 ttyLocker ttyl;
2028 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, p2i(pc));
2029 print();
2030 method()->print_codes();
2031 print_code();
2032 print_pcs();
2033 }
2034 #endif
2035 if (cont_offset == 0) {
2036 // Let the normal error handling report the exception
2037 return NULL;
2038 }
2039 return code_begin() + cont_offset;
2040 }
2041
2042
2043
2044 void nmethod_init() {
2045 // make sure you didn't forget to adjust the filler fields
2046 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
2047 }
2048
2049
2050 //-------------------------------------------------------------------------------------------
2051
2052
2053 // QQQ might we make this work from a frame??
2054 nmethodLocker::nmethodLocker(address pc) {
2055 CodeBlob* cb = CodeCache::find_blob(pc);
2056 guarantee(cb != NULL && cb->is_compiled(), "bad pc for a nmethod found");
2057 _nm = cb->as_compiled_method();
2058 lock_nmethod(_nm);
2059 }
2060
2061 // Only JvmtiDeferredEvent::compiled_method_unload_event()
2062 // should pass zombie_ok == true.
2063 void nmethodLocker::lock_nmethod(CompiledMethod* cm, bool zombie_ok) {
2064 if (cm == NULL) return;
2065 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method
2066 nmethod* nm = cm->as_nmethod();
2067 Atomic::inc(&nm->_lock_count);
2068 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method");
2069 }
2070
2071 void nmethodLocker::unlock_nmethod(CompiledMethod* cm) {
2072 if (cm == NULL) return;
2073 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method
2074 nmethod* nm = cm->as_nmethod();
2075 Atomic::dec(&nm->_lock_count);
2076 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock");
2077 }
2078
2079
2080 // -----------------------------------------------------------------------------
2081 // Verification
2082
2083 class VerifyOopsClosure: public OopClosure {
2084 nmethod* _nm;
2085 bool _ok;
2086 public:
2087 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
2088 bool ok() { return _ok; }
2089 virtual void do_oop(oop* p) {
2090 if ((*p) == NULL || (*p)->is_oop()) return;
2091 if (_ok) {
2092 _nm->print_nmethod(true);
2093 _ok = false;
2094 }
2095 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2096 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2097 }
2098 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2099 };
2100
2101 void nmethod::verify() {
2102
2103 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant
2104 // seems odd.
2105
2106 if (is_zombie() || is_not_entrant() || is_unloaded())
2107 return;
2108
2109 // Make sure all the entry points are correctly aligned for patching.
2110 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
2111
2112 // assert(method()->is_oop(), "must be valid");
2113
2114 ResourceMark rm;
2115
2116 if (!CodeCache::contains(this)) {
2117 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this));
2118 }
2119
2120 if(is_native_method() )
2121 return;
2122
2123 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
2124 if (nm != this) {
2125 fatal("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this));
2126 }
2127
2128 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2129 if (! p->verify(this)) {
2130 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this));
2131 }
2132 }
2133
2134 VerifyOopsClosure voc(this);
2135 oops_do(&voc);
2136 assert(voc.ok(), "embedded oops must be OK");
2137 verify_scavenge_root_oops();
2138
2139 verify_scopes();
2140 }
2141
2142
2143 void nmethod::verify_interrupt_point(address call_site) {
2144 // Verify IC only when nmethod installation is finished.
2145 bool is_installed = (method()->code() == this) // nmethod is in state 'in_use' and installed
2146 || !this->is_in_use(); // nmethod is installed, but not in 'in_use' state
2147 if (is_installed) {
2148 Thread *cur = Thread::current();
2149 if (CompiledIC_lock->owner() == cur ||
2150 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) &&
2151 SafepointSynchronize::is_at_safepoint())) {
2152 CompiledIC_at(this, call_site);
2153 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
2154 } else {
2155 MutexLocker ml_verify (CompiledIC_lock);
2156 CompiledIC_at(this, call_site);
2157 }
2158 }
2159
2160 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address());
2161 assert(pd != NULL, "PcDesc must exist");
2162 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(),
2163 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(),
2164 pd->return_oop());
2165 !sd->is_top(); sd = sd->sender()) {
2166 sd->verify();
2167 }
2168 }
2169
2170 void nmethod::verify_scopes() {
2171 if( !method() ) return; // Runtime stubs have no scope
2172 if (method()->is_native()) return; // Ignore stub methods.
2173 // iterate through all interrupt point
2174 // and verify the debug information is valid.
2175 RelocIterator iter((nmethod*)this);
2176 while (iter.next()) {
2177 address stub = NULL;
2178 switch (iter.type()) {
2179 case relocInfo::virtual_call_type:
2180 verify_interrupt_point(iter.addr());
2181 break;
2182 case relocInfo::opt_virtual_call_type:
2183 stub = iter.opt_virtual_call_reloc()->static_stub(false);
2184 verify_interrupt_point(iter.addr());
2185 break;
2186 case relocInfo::static_call_type:
2187 stub = iter.static_call_reloc()->static_stub(false);
2188 //verify_interrupt_point(iter.addr());
2189 break;
2190 case relocInfo::runtime_call_type:
2191 case relocInfo::runtime_call_w_cp_type:
2192 address destination = iter.reloc()->value();
2193 // Right now there is no way to find out which entries support
2194 // an interrupt point. It would be nice if we had this
2195 // information in a table.
2196 break;
2197 }
2198 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section");
2199 }
2200 }
2201
2202
2203 // -----------------------------------------------------------------------------
2204 // Non-product code
2205 #ifndef PRODUCT
2206
2207 class DebugScavengeRoot: public OopClosure {
2208 nmethod* _nm;
2209 bool _ok;
2210 public:
2211 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { }
2212 bool ok() { return _ok; }
2213 virtual void do_oop(oop* p) {
2214 if ((*p) == NULL || !(*p)->is_scavengable()) return;
2215 if (_ok) {
2216 _nm->print_nmethod(true);
2217 _ok = false;
2218 }
2219 tty->print_cr("*** scavengable oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2220 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2221 (*p)->print();
2222 }
2223 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2224 };
2225
2226 void nmethod::verify_scavenge_root_oops() {
2227 if (UseG1GC) {
2228 return;
2229 }
2230
2231 if (!on_scavenge_root_list()) {
2232 // Actually look inside, to verify the claim that it's clean.
2233 DebugScavengeRoot debug_scavenge_root(this);
2234 oops_do(&debug_scavenge_root);
2235 if (!debug_scavenge_root.ok())
2236 fatal("found an unadvertised bad scavengable oop in the code cache");
2237 }
2238 assert(scavenge_root_not_marked(), "");
2239 }
2240
2241 #endif // PRODUCT
2242
2243 // Printing operations
2244
2245 void nmethod::print() const {
2246 ResourceMark rm;
2247 ttyLocker ttyl; // keep the following output all in one block
2248
2249 tty->print("Compiled method ");
2250
2251 if (is_compiled_by_c1()) {
2252 tty->print("(c1) ");
2253 } else if (is_compiled_by_c2()) {
2254 tty->print("(c2) ");
2255 } else if (is_compiled_by_shark()) {
2256 tty->print("(shark) ");
2257 } else if (is_compiled_by_jvmci()) {
2258 tty->print("(JVMCI) ");
2259 } else {
2260 tty->print("(nm) ");
2261 }
2262
2263 print_on(tty, NULL);
2264
2265 if (WizardMode) {
2266 tty->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this));
2267 tty->print(" for method " INTPTR_FORMAT , p2i(method()));
2268 tty->print(" { ");
2269 tty->print_cr("%s ", state());
2270 if (on_scavenge_root_list()) tty->print("scavenge_root ");
2271 tty->print_cr("}:");
2272 }
2273 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2274 p2i(this),
2275 p2i(this) + size(),
2276 size());
2277 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2278 p2i(relocation_begin()),
2279 p2i(relocation_end()),
2280 relocation_size());
2281 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2282 p2i(consts_begin()),
2283 p2i(consts_end()),
2284 consts_size());
2285 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2286 p2i(insts_begin()),
2287 p2i(insts_end()),
2288 insts_size());
2289 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2290 p2i(stub_begin()),
2291 p2i(stub_end()),
2292 stub_size());
2293 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2294 p2i(oops_begin()),
2295 p2i(oops_end()),
2296 oops_size());
2297 if (metadata_size () > 0) tty->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2298 p2i(metadata_begin()),
2299 p2i(metadata_end()),
2300 metadata_size());
2301 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2302 p2i(scopes_data_begin()),
2303 p2i(scopes_data_end()),
2304 scopes_data_size());
2305 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2306 p2i(scopes_pcs_begin()),
2307 p2i(scopes_pcs_end()),
2308 scopes_pcs_size());
2309 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2310 p2i(dependencies_begin()),
2311 p2i(dependencies_end()),
2312 dependencies_size());
2313 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2314 p2i(handler_table_begin()),
2315 p2i(handler_table_end()),
2316 handler_table_size());
2317 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2318 p2i(nul_chk_table_begin()),
2319 p2i(nul_chk_table_end()),
2320 nul_chk_table_size());
2321 }
2322
2323 #ifndef PRODUCT
2324
2325 void nmethod::print_scopes() {
2326 // Find the first pc desc for all scopes in the code and print it.
2327 ResourceMark rm;
2328 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2329 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
2330 continue;
2331
2332 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
2333 while (sd != NULL) {
2334 sd->print_on(tty, p);
2335 sd = sd->sender();
2336 }
2337 }
2338 }
2339
2340 void nmethod::print_dependencies() {
2341 ResourceMark rm;
2342 ttyLocker ttyl; // keep the following output all in one block
2343 tty->print_cr("Dependencies:");
2344 for (Dependencies::DepStream deps(this); deps.next(); ) {
2345 deps.print_dependency();
2346 Klass* ctxk = deps.context_type();
2347 if (ctxk != NULL) {
2348 if (ctxk->is_instance_klass() && InstanceKlass::cast(ctxk)->is_dependent_nmethod(this)) {
2349 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name());
2350 }
2351 }
2352 deps.log_dependency(); // put it into the xml log also
2353 }
2354 }
2355
2356
2357 void nmethod::print_relocations() {
2358 ResourceMark m; // in case methods get printed via the debugger
2359 tty->print_cr("relocations:");
2360 RelocIterator iter(this);
2361 iter.print();
2362 }
2363
2364
2365 void nmethod::print_pcs() {
2366 ResourceMark m; // in case methods get printed via debugger
2367 tty->print_cr("pc-bytecode offsets:");
2368 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2369 p->print(this);
2370 }
2371 }
2372
2373 void nmethod::print_recorded_oops() {
2374 tty->print_cr("Recorded oops:");
2375 for (int i = 0; i < oops_count(); i++) {
2376 oop o = oop_at(i);
2377 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(o));
2378 if (o == (oop)Universe::non_oop_word()) {
2379 tty->print("non-oop word");
2380 } else {
2381 o->print_value();
2382 }
2383 tty->cr();
2384 }
2385 }
2386
2387 void nmethod::print_recorded_metadata() {
2388 tty->print_cr("Recorded metadata:");
2389 for (int i = 0; i < metadata_count(); i++) {
2390 Metadata* m = metadata_at(i);
2391 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(m));
2392 if (m == (Metadata*)Universe::non_oop_word()) {
2393 tty->print("non-metadata word");
2394 } else {
2395 m->print_value_on_maybe_null(tty);
2396 }
2397 tty->cr();
2398 }
2399 }
2400
2401 #endif // PRODUCT
2402
2403 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
2404 RelocIterator iter(this, begin, end);
2405 bool have_one = false;
2406 while (iter.next()) {
2407 have_one = true;
2408 switch (iter.type()) {
2409 case relocInfo::none: return "no_reloc";
2410 case relocInfo::oop_type: {
2411 stringStream st;
2412 oop_Relocation* r = iter.oop_reloc();
2413 oop obj = r->oop_value();
2414 st.print("oop(");
2415 if (obj == NULL) st.print("NULL");
2416 else obj->print_value_on(&st);
2417 st.print(")");
2418 return st.as_string();
2419 }
2420 case relocInfo::metadata_type: {
2421 stringStream st;
2422 metadata_Relocation* r = iter.metadata_reloc();
2423 Metadata* obj = r->metadata_value();
2424 st.print("metadata(");
2425 if (obj == NULL) st.print("NULL");
2426 else obj->print_value_on(&st);
2427 st.print(")");
2428 return st.as_string();
2429 }
2430 case relocInfo::runtime_call_type:
2431 case relocInfo::runtime_call_w_cp_type: {
2432 stringStream st;
2433 st.print("runtime_call");
2434 CallRelocation* r = (CallRelocation*)iter.reloc();
2435 address dest = r->destination();
2436 CodeBlob* cb = CodeCache::find_blob(dest);
2437 if (cb != NULL) {
2438 st.print(" %s", cb->name());
2439 } else {
2440 ResourceMark rm;
2441 const int buflen = 1024;
2442 char* buf = NEW_RESOURCE_ARRAY(char, buflen);
2443 int offset;
2444 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) {
2445 st.print(" %s", buf);
2446 if (offset != 0) {
2447 st.print("+%d", offset);
2448 }
2449 }
2450 }
2451 return st.as_string();
2452 }
2453 case relocInfo::virtual_call_type: {
2454 stringStream st;
2455 st.print_raw("virtual_call");
2456 virtual_call_Relocation* r = iter.virtual_call_reloc();
2457 Method* m = r->method_value();
2458 if (m != NULL) {
2459 assert(m->is_method(), "");
2460 m->print_short_name(&st);
2461 }
2462 return st.as_string();
2463 }
2464 case relocInfo::opt_virtual_call_type: {
2465 stringStream st;
2466 st.print_raw("optimized virtual_call");
2467 opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc();
2468 Method* m = r->method_value();
2469 if (m != NULL) {
2470 assert(m->is_method(), "");
2471 m->print_short_name(&st);
2472 }
2473 return st.as_string();
2474 }
2475 case relocInfo::static_call_type: {
2476 stringStream st;
2477 st.print_raw("static_call");
2478 static_call_Relocation* r = iter.static_call_reloc();
2479 Method* m = r->method_value();
2480 if (m != NULL) {
2481 assert(m->is_method(), "");
2482 m->print_short_name(&st);
2483 }
2484 return st.as_string();
2485 }
2486 case relocInfo::static_stub_type: return "static_stub";
2487 case relocInfo::external_word_type: return "external_word";
2488 case relocInfo::internal_word_type: return "internal_word";
2489 case relocInfo::section_word_type: return "section_word";
2490 case relocInfo::poll_type: return "poll";
2491 case relocInfo::poll_return_type: return "poll_return";
2492 case relocInfo::type_mask: return "type_bit_mask";
2493 }
2494 }
2495 return have_one ? "other" : NULL;
2496 }
2497
2498 // Return a the last scope in (begin..end]
2499 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
2500 PcDesc* p = pc_desc_near(begin+1);
2501 if (p != NULL && p->real_pc(this) <= end) {
2502 return new ScopeDesc(this, p->scope_decode_offset(),
2503 p->obj_decode_offset(), p->should_reexecute(), p->rethrow_exception(),
2504 p->return_oop());
2505 }
2506 return NULL;
2507 }
2508
2509 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const {
2510 if (block_begin == entry_point()) stream->print_cr("[Entry Point]");
2511 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]");
2512 if (JVMCI_ONLY(_exception_offset >= 0 &&) block_begin == exception_begin()) stream->print_cr("[Exception Handler]");
2513 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]");
2514 if (JVMCI_ONLY(_deopt_handler_begin != NULL &&) block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]");
2515
2516 if (has_method_handle_invokes())
2517 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]");
2518
2519 if (block_begin == consts_begin()) stream->print_cr("[Constants]");
2520
2521 if (block_begin == entry_point()) {
2522 methodHandle m = method();
2523 if (m.not_null()) {
2524 stream->print(" # ");
2525 m->print_value_on(stream);
2526 stream->cr();
2527 }
2528 if (m.not_null() && !is_osr_method()) {
2529 ResourceMark rm;
2530 int sizeargs = m->size_of_parameters();
2531 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
2532 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
2533 {
2534 int sig_index = 0;
2535 if (!m->is_static())
2536 sig_bt[sig_index++] = T_OBJECT; // 'this'
2537 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) {
2538 BasicType t = ss.type();
2539 sig_bt[sig_index++] = t;
2540 if (type2size[t] == 2) {
2541 sig_bt[sig_index++] = T_VOID;
2542 } else {
2543 assert(type2size[t] == 1, "size is 1 or 2");
2544 }
2545 }
2546 assert(sig_index == sizeargs, "");
2547 }
2548 const char* spname = "sp"; // make arch-specific?
2549 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false);
2550 int stack_slot_offset = this->frame_size() * wordSize;
2551 int tab1 = 14, tab2 = 24;
2552 int sig_index = 0;
2553 int arg_index = (m->is_static() ? 0 : -1);
2554 bool did_old_sp = false;
2555 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) {
2556 bool at_this = (arg_index == -1);
2557 bool at_old_sp = false;
2558 BasicType t = (at_this ? T_OBJECT : ss.type());
2559 assert(t == sig_bt[sig_index], "sigs in sync");
2560 if (at_this)
2561 stream->print(" # this: ");
2562 else
2563 stream->print(" # parm%d: ", arg_index);
2564 stream->move_to(tab1);
2565 VMReg fst = regs[sig_index].first();
2566 VMReg snd = regs[sig_index].second();
2567 if (fst->is_reg()) {
2568 stream->print("%s", fst->name());
2569 if (snd->is_valid()) {
2570 stream->print(":%s", snd->name());
2571 }
2572 } else if (fst->is_stack()) {
2573 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
2574 if (offset == stack_slot_offset) at_old_sp = true;
2575 stream->print("[%s+0x%x]", spname, offset);
2576 } else {
2577 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
2578 }
2579 stream->print(" ");
2580 stream->move_to(tab2);
2581 stream->print("= ");
2582 if (at_this) {
2583 m->method_holder()->print_value_on(stream);
2584 } else {
2585 bool did_name = false;
2586 if (!at_this && ss.is_object()) {
2587 Symbol* name = ss.as_symbol_or_null();
2588 if (name != NULL) {
2589 name->print_value_on(stream);
2590 did_name = true;
2591 }
2592 }
2593 if (!did_name)
2594 stream->print("%s", type2name(t));
2595 }
2596 if (at_old_sp) {
2597 stream->print(" (%s of caller)", spname);
2598 did_old_sp = true;
2599 }
2600 stream->cr();
2601 sig_index += type2size[t];
2602 arg_index += 1;
2603 if (!at_this) ss.next();
2604 }
2605 if (!did_old_sp) {
2606 stream->print(" # ");
2607 stream->move_to(tab1);
2608 stream->print("[%s+0x%x]", spname, stack_slot_offset);
2609 stream->print(" (%s of caller)", spname);
2610 stream->cr();
2611 }
2612 }
2613 }
2614 }
2615
2616 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) {
2617 // First, find an oopmap in (begin, end].
2618 // We use the odd half-closed interval so that oop maps and scope descs
2619 // which are tied to the byte after a call are printed with the call itself.
2620 address base = code_begin();
2621 ImmutableOopMapSet* oms = oop_maps();
2622 if (oms != NULL) {
2623 for (int i = 0, imax = oms->count(); i < imax; i++) {
2624 const ImmutableOopMapPair* pair = oms->pair_at(i);
2625 const ImmutableOopMap* om = pair->get_from(oms);
2626 address pc = base + pair->pc_offset();
2627 if (pc > begin) {
2628 if (pc <= end) {
2629 st->move_to(column);
2630 st->print("; ");
2631 om->print_on(st);
2632 }
2633 break;
2634 }
2635 }
2636 }
2637
2638 // Print any debug info present at this pc.
2639 ScopeDesc* sd = scope_desc_in(begin, end);
2640 if (sd != NULL) {
2641 st->move_to(column);
2642 if (sd->bci() == SynchronizationEntryBCI) {
2643 st->print(";*synchronization entry");
2644 } else {
2645 if (sd->method() == NULL) {
2646 st->print("method is NULL");
2647 } else if (sd->method()->is_native()) {
2648 st->print("method is native");
2649 } else {
2650 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci());
2651 st->print(";*%s", Bytecodes::name(bc));
2652 switch (bc) {
2653 case Bytecodes::_invokevirtual:
2654 case Bytecodes::_invokespecial:
2655 case Bytecodes::_invokestatic:
2656 case Bytecodes::_invokeinterface:
2657 {
2658 Bytecode_invoke invoke(sd->method(), sd->bci());
2659 st->print(" ");
2660 if (invoke.name() != NULL)
2661 invoke.name()->print_symbol_on(st);
2662 else
2663 st->print("<UNKNOWN>");
2664 break;
2665 }
2666 case Bytecodes::_getfield:
2667 case Bytecodes::_putfield:
2668 case Bytecodes::_getstatic:
2669 case Bytecodes::_putstatic:
2670 {
2671 Bytecode_field field(sd->method(), sd->bci());
2672 st->print(" ");
2673 if (field.name() != NULL)
2674 field.name()->print_symbol_on(st);
2675 else
2676 st->print("<UNKNOWN>");
2677 }
2678 }
2679 }
2680 st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop());
2681 }
2682
2683 // Print all scopes
2684 for (;sd != NULL; sd = sd->sender()) {
2685 st->move_to(column);
2686 st->print("; -");
2687 if (sd->method() == NULL) {
2688 st->print("method is NULL");
2689 } else {
2690 sd->method()->print_short_name(st);
2691 }
2692 int lineno = sd->method()->line_number_from_bci(sd->bci());
2693 if (lineno != -1) {
2694 st->print("@%d (line %d)", sd->bci(), lineno);
2695 } else {
2696 st->print("@%d", sd->bci());
2697 }
2698 st->cr();
2699 }
2700 }
2701
2702 // Print relocation information
2703 const char* str = reloc_string_for(begin, end);
2704 if (str != NULL) {
2705 if (sd != NULL) st->cr();
2706 st->move_to(column);
2707 st->print("; {%s}", str);
2708 }
2709 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin());
2710 if (cont_offset != 0) {
2711 st->move_to(column);
2712 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset));
2713 }
2714
2715 }
2716
2717 class DirectNativeCallWrapper: public NativeCallWrapper {
2718 private:
2719 NativeCall* _call;
2720
2721 public:
2722 DirectNativeCallWrapper(NativeCall* call) : _call(call) {}
2723
2724 virtual address destination() const { return _call->destination(); }
2725 virtual address instruction_address() const { return _call->instruction_address(); }
2726 virtual address next_instruction_address() const { return _call->next_instruction_address(); }
2727 virtual address return_address() const { return _call->return_address(); }
2728
2729 virtual address get_resolve_call_stub(bool is_optimized) const {
2730 if (is_optimized) {
2731 return SharedRuntime::get_resolve_opt_virtual_call_stub();
2732 }
2733 return SharedRuntime::get_resolve_virtual_call_stub();
2734 }
2735
2736 virtual void set_destination_mt_safe(address dest) {
2737 #if INCLUDE_AOT
2738 if (UseAOT) {
2739 CodeBlob* callee = CodeCache::find_blob(dest);
2740 CompiledMethod* cm = callee->as_compiled_method_or_null();
2741 if (cm != NULL && cm->is_far_code()) {
2742 // Temporary fix, see JDK-8143106
2743 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address());
2744 csc->set_to_far(methodHandle(cm->method()), dest);
2745 return;
2746 }
2747 }
2748 #endif
2749 _call->set_destination_mt_safe(dest);
2750 }
2751
2752 virtual void set_to_interpreted(const methodHandle& method, CompiledICInfo& info) {
2753 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address());
2754 #if INCLUDE_AOT
2755 if (info.to_aot()) {
2756 csc->set_to_far(method, info.entry());
2757 } else
2758 #endif
2759 {
2760 csc->set_to_interpreted(method, info.entry());
2761 }
2762 }
2763
2764 virtual void verify() const {
2765 // make sure code pattern is actually a call imm32 instruction
2766 _call->verify();
2767 if (os::is_MP()) {
2768 _call->verify_alignment();
2769 }
2770 }
2771
2772 virtual void verify_resolve_call(address dest) const {
2773 CodeBlob* db = CodeCache::find_blob_unsafe(dest);
2774 assert(!db->is_adapter_blob(), "must use stub!");
2775 }
2776
2777 virtual bool is_call_to_interpreted(address dest) const {
2778 CodeBlob* cb = CodeCache::find_blob(_call->instruction_address());
2779 return cb->contains(dest);
2780 }
2781
2782 virtual bool is_safe_for_patching() const { return false; }
2783
2784 virtual NativeInstruction* get_load_instruction(virtual_call_Relocation* r) const {
2785 return nativeMovConstReg_at(r->cached_value());
2786 }
2787
2788 virtual void *get_data(NativeInstruction* instruction) const {
2789 return (void*)((NativeMovConstReg*) instruction)->data();
2790 }
2791
2792 virtual void set_data(NativeInstruction* instruction, intptr_t data) {
2793 ((NativeMovConstReg*) instruction)->set_data(data);
2794 }
2795 };
2796
2797 NativeCallWrapper* nmethod::call_wrapper_at(address call) const {
2798 return new DirectNativeCallWrapper((NativeCall*) call);
2799 }
2800
2801 NativeCallWrapper* nmethod::call_wrapper_before(address return_pc) const {
2802 return new DirectNativeCallWrapper(nativeCall_before(return_pc));
2803 }
2804
2805 address nmethod::call_instruction_address(address pc) const {
2806 if (NativeCall::is_call_before(pc)) {
2807 NativeCall *ncall = nativeCall_before(pc);
2808 return ncall->instruction_address();
2809 }
2810 return NULL;
2811 }
2812
2813 CompiledStaticCall* nmethod::compiledStaticCall_at(Relocation* call_site) const {
2814 return CompiledDirectStaticCall::at(call_site);
2815 }
2816
2817 CompiledStaticCall* nmethod::compiledStaticCall_at(address call_site) const {
2818 return CompiledDirectStaticCall::at(call_site);
2819 }
2820
2821 CompiledStaticCall* nmethod::compiledStaticCall_before(address return_addr) const {
2822 return CompiledDirectStaticCall::before(return_addr);
2823 }
2824
2825 #ifndef PRODUCT
2826
2827 void nmethod::print_value_on(outputStream* st) const {
2828 st->print("nmethod");
2829 print_on(st, NULL);
2830 }
2831
2832 void nmethod::print_calls(outputStream* st) {
2833 RelocIterator iter(this);
2834 while (iter.next()) {
2835 switch (iter.type()) {
2836 case relocInfo::virtual_call_type:
2837 case relocInfo::opt_virtual_call_type: {
2838 VerifyMutexLocker mc(CompiledIC_lock);
2839 CompiledIC_at(&iter)->print();
2840 break;
2841 }
2842 case relocInfo::static_call_type:
2843 st->print_cr("Static call at " INTPTR_FORMAT, p2i(iter.reloc()->addr()));
2844 CompiledDirectStaticCall::at(iter.reloc())->print();
2845 break;
2846 }
2847 }
2848 }
2849
2850 void nmethod::print_handler_table() {
2851 ExceptionHandlerTable(this).print();
2852 }
2853
2854 void nmethod::print_nul_chk_table() {
2855 ImplicitExceptionTable(this).print(code_begin());
2856 }
2857
2858 void nmethod::print_statistics() {
2859 ttyLocker ttyl;
2860 if (xtty != NULL) xtty->head("statistics type='nmethod'");
2861 native_nmethod_stats.print_native_nmethod_stats();
2862 #ifdef COMPILER1
2863 c1_java_nmethod_stats.print_nmethod_stats("C1");
2864 #endif
2865 #ifdef COMPILER2
2866 c2_java_nmethod_stats.print_nmethod_stats("C2");
2867 #endif
2868 #if INCLUDE_JVMCI
2869 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI");
2870 #endif
2871 #ifdef SHARK
2872 shark_java_nmethod_stats.print_nmethod_stats("Shark");
2873 #endif
2874 unknown_java_nmethod_stats.print_nmethod_stats("Unknown");
2875 DebugInformationRecorder::print_statistics();
2876 #ifndef PRODUCT
2877 pc_nmethod_stats.print_pc_stats();
2878 #endif
2879 Dependencies::print_statistics();
2880 if (xtty != NULL) xtty->tail("statistics");
2881 }
2882
2883 #endif // !PRODUCT
2884
2885 #if INCLUDE_JVMCI
2886 void nmethod::clear_jvmci_installed_code() {
2887 // write_ref_method_pre/post can only be safely called at a
2888 // safepoint or while holding the CodeCache_lock
2889 assert(CodeCache_lock->is_locked() ||
2890 SafepointSynchronize::is_at_safepoint(), "should be performed under a lock for consistency");
2891 if (_jvmci_installed_code != NULL) {
2892 // This must be done carefully to maintain nmethod remembered sets properly
2893 BarrierSet* bs = Universe::heap()->barrier_set();
2894 bs->write_ref_nmethod_pre(&_jvmci_installed_code, this);
2895 _jvmci_installed_code = NULL;
2896 bs->write_ref_nmethod_post(&_jvmci_installed_code, this);
2897 }
2898 }
2899
2900 void nmethod::maybe_invalidate_installed_code() {
2901 assert(Patching_lock->is_locked() ||
2902 SafepointSynchronize::is_at_safepoint(), "should be performed under a lock for consistency");
2903 oop installed_code = jvmci_installed_code();
2904 if (installed_code != NULL) {
2905 nmethod* nm = (nmethod*)InstalledCode::address(installed_code);
2906 if (nm == NULL || nm != this) {
2907 // The link has been broken or the InstalledCode instance is
2908 // associated with another nmethod so do nothing.
2909 return;
2910 }
2911 if (!is_alive()) {
2912 // Break the link between nmethod and InstalledCode such that the nmethod
2913 // can subsequently be flushed safely. The link must be maintained while
2914 // the method could have live activations since invalidateInstalledCode
2915 // might want to invalidate all existing activations.
2916 InstalledCode::set_address(installed_code, 0);
2917 InstalledCode::set_entryPoint(installed_code, 0);
2918 } else if (is_not_entrant()) {
2919 // Remove the entry point so any invocation will fail but keep
2920 // the address link around that so that existing activations can
2921 // be invalidated.
2922 InstalledCode::set_entryPoint(installed_code, 0);
2923 }
2924 }
2925 }
2926
2927 void nmethod::invalidate_installed_code(Handle installedCode, TRAPS) {
2928 if (installedCode() == NULL) {
2929 THROW(vmSymbols::java_lang_NullPointerException());
2930 }
2931 jlong nativeMethod = InstalledCode::address(installedCode);
2932 nmethod* nm = (nmethod*)nativeMethod;
2933 if (nm == NULL) {
2934 // Nothing to do
2935 return;
2936 }
2937
2938 nmethodLocker nml(nm);
2939 #ifdef ASSERT
2940 {
2941 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
2942 // This relationship can only be checked safely under a lock
2943 assert(nm == NULL || !nm->is_alive() || nm->jvmci_installed_code() == installedCode(), "sanity check");
2944 }
2945 #endif
2946
2947 if (nm->is_alive()) {
2948 // The nmethod state machinery maintains the link between the
2949 // HotSpotInstalledCode and nmethod* so as long as the nmethod appears to be
2950 // alive assume there is work to do and deoptimize the nmethod.
2951 nm->mark_for_deoptimization();
2952 VM_Deoptimize op;
2953 VMThread::execute(&op);
2954 }
2955
2956 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
2957 // Check that it's still associated with the same nmethod and break
2958 // the link if it is.
2959 if (InstalledCode::address(installedCode) == nativeMethod) {
2960 InstalledCode::set_address(installedCode, 0);
2961 }
2962 }
2963
2964 char* nmethod::jvmci_installed_code_name(char* buf, size_t buflen) {
2965 if (!this->is_compiled_by_jvmci()) {
2966 return NULL;
2967 }
2968 oop installedCode = this->jvmci_installed_code();
2969 if (installedCode != NULL) {
2970 oop installedCodeName = NULL;
2971 if (installedCode->is_a(InstalledCode::klass())) {
2972 installedCodeName = InstalledCode::name(installedCode);
2973 }
2974 if (installedCodeName != NULL) {
2975 return java_lang_String::as_utf8_string(installedCodeName, buf, (int)buflen);
2976 } else {
2977 jio_snprintf(buf, buflen, "null");
2978 return buf;
2979 }
2980 }
2981 jio_snprintf(buf, buflen, "noInstalledCode");
2982 return buf;
2983 }
2984 #endif
2985