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