1 /*
2 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "code/codeCache.hpp"
27 #include "code/compiledIC.hpp"
28 #include "code/dependencies.hpp"
29 #include "code/nativeInst.hpp"
30 #include "code/nmethod.hpp"
31 #include "code/scopeDesc.hpp"
32 #include "compiler/abstractCompiler.hpp"
33 #include "compiler/compileBroker.hpp"
34 #include "compiler/compileLog.hpp"
35 #include "compiler/compilerDirectives.hpp"
36 #include "compiler/directivesParser.hpp"
37 #include "compiler/disassembler.hpp"
38 #include "interpreter/bytecode.hpp"
39 #include "logging/log.hpp"
40 #include "memory/resourceArea.hpp"
41 #include "oops/methodData.hpp"
42 #include "oops/oop.inline.hpp"
43 #include "prims/jvmtiImpl.hpp"
44 #include "runtime/atomic.hpp"
45 #include "runtime/orderAccess.inline.hpp"
46 #include "runtime/os.hpp"
47 #include "runtime/sharedRuntime.hpp"
48 #include "runtime/sweeper.hpp"
49 #include "utilities/resourceHash.hpp"
50 #include "utilities/dtrace.hpp"
51 #include "utilities/events.hpp"
52 #include "utilities/xmlstream.hpp"
53 #include "logging/log.hpp"
54 #ifdef SHARK
55 #include "shark/sharkCompiler.hpp"
56 #endif
57 #if INCLUDE_JVMCI
58 #include "jvmci/jvmciJavaClasses.hpp"
59 #endif
60
61 #ifdef DTRACE_ENABLED
62
63 // Only bother with this argument setup if dtrace is available
64
65 #define DTRACE_METHOD_UNLOAD_PROBE(method) \
66 { \
67 Method* m = (method); \
68 if (m != NULL) { \
69 Symbol* klass_name = m->klass_name(); \
70 Symbol* name = m->name(); \
71 Symbol* signature = m->signature(); \
72 HOTSPOT_COMPILED_METHOD_UNLOAD( \
73 (char *) klass_name->bytes(), klass_name->utf8_length(), \
74 (char *) name->bytes(), name->utf8_length(), \
75 (char *) signature->bytes(), signature->utf8_length()); \
76 } \
77 }
78
79 #else // ndef DTRACE_ENABLED
80
81 #define DTRACE_METHOD_UNLOAD_PROBE(method)
82
83 #endif
84
85 //---------------------------------------------------------------------------------
86 // NMethod statistics
87 // They are printed under various flags, including:
88 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation.
89 // (In the latter two cases, they like other stats are printed to the log only.)
90
91 #ifndef PRODUCT
92 // These variables are put into one block to reduce relocations
93 // and make it simpler to print from the debugger.
94 struct java_nmethod_stats_struct {
95 int nmethod_count;
96 int total_size;
97 int relocation_size;
98 int consts_size;
99 int insts_size;
100 int stub_size;
101 int scopes_data_size;
102 int scopes_pcs_size;
103 int dependencies_size;
104 int handler_table_size;
105 int nul_chk_table_size;
106 int oops_size;
107 int metadata_size;
108
109 void note_nmethod(nmethod* nm) {
110 nmethod_count += 1;
111 total_size += nm->size();
112 relocation_size += nm->relocation_size();
113 consts_size += nm->consts_size();
114 insts_size += nm->insts_size();
115 stub_size += nm->stub_size();
116 oops_size += nm->oops_size();
117 metadata_size += nm->metadata_size();
118 scopes_data_size += nm->scopes_data_size();
119 scopes_pcs_size += nm->scopes_pcs_size();
120 dependencies_size += nm->dependencies_size();
121 handler_table_size += nm->handler_table_size();
122 nul_chk_table_size += nm->nul_chk_table_size();
123 }
124 void print_nmethod_stats(const char* name) {
125 if (nmethod_count == 0) return;
126 tty->print_cr("Statistics for %d bytecoded nmethods for %s:", nmethod_count, name);
127 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size);
128 if (nmethod_count != 0) tty->print_cr(" header = " SIZE_FORMAT, nmethod_count * sizeof(nmethod));
129 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size);
130 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size);
131 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size);
132 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size);
133 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size);
134 if (metadata_size != 0) tty->print_cr(" metadata = %d", metadata_size);
135 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size);
136 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size);
137 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size);
138 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size);
139 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size);
140 }
141 };
142
143 struct native_nmethod_stats_struct {
144 int native_nmethod_count;
145 int native_total_size;
146 int native_relocation_size;
147 int native_insts_size;
148 int native_oops_size;
149 int native_metadata_size;
150 void note_native_nmethod(nmethod* nm) {
151 native_nmethod_count += 1;
152 native_total_size += nm->size();
153 native_relocation_size += nm->relocation_size();
154 native_insts_size += nm->insts_size();
155 native_oops_size += nm->oops_size();
156 native_metadata_size += nm->metadata_size();
157 }
158 void print_native_nmethod_stats() {
159 if (native_nmethod_count == 0) return;
160 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count);
161 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size);
162 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size);
163 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size);
164 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size);
165 if (native_metadata_size != 0) tty->print_cr(" N. metadata = %d", native_metadata_size);
166 }
167 };
168
169 struct pc_nmethod_stats_struct {
170 int pc_desc_resets; // number of resets (= number of caches)
171 int pc_desc_queries; // queries to nmethod::find_pc_desc
172 int pc_desc_approx; // number of those which have approximate true
173 int pc_desc_repeats; // number of _pc_descs[0] hits
174 int pc_desc_hits; // number of LRU cache hits
175 int pc_desc_tests; // total number of PcDesc examinations
176 int pc_desc_searches; // total number of quasi-binary search steps
177 int pc_desc_adds; // number of LUR cache insertions
178
179 void print_pc_stats() {
180 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query",
181 pc_desc_queries,
182 (double)(pc_desc_tests + pc_desc_searches)
183 / pc_desc_queries);
184 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d",
185 pc_desc_resets,
186 pc_desc_queries, pc_desc_approx,
187 pc_desc_repeats, pc_desc_hits,
188 pc_desc_tests, pc_desc_searches, pc_desc_adds);
189 }
190 };
191
192 #ifdef COMPILER1
193 static java_nmethod_stats_struct c1_java_nmethod_stats;
194 #endif
195 #ifdef COMPILER2
196 static java_nmethod_stats_struct c2_java_nmethod_stats;
197 #endif
198 #if INCLUDE_JVMCI
199 static java_nmethod_stats_struct jvmci_java_nmethod_stats;
200 #endif
201 #ifdef SHARK
202 static java_nmethod_stats_struct shark_java_nmethod_stats;
203 #endif
204 static java_nmethod_stats_struct unknown_java_nmethod_stats;
205
206 static native_nmethod_stats_struct native_nmethod_stats;
207 static pc_nmethod_stats_struct pc_nmethod_stats;
208
209 static void note_java_nmethod(nmethod* nm) {
210 #ifdef COMPILER1
211 if (nm->is_compiled_by_c1()) {
212 c1_java_nmethod_stats.note_nmethod(nm);
213 } else
214 #endif
215 #ifdef COMPILER2
216 if (nm->is_compiled_by_c2()) {
217 c2_java_nmethod_stats.note_nmethod(nm);
218 } else
219 #endif
220 #if INCLUDE_JVMCI
221 if (nm->is_compiled_by_jvmci()) {
222 jvmci_java_nmethod_stats.note_nmethod(nm);
223 } else
224 #endif
225 #ifdef SHARK
226 if (nm->is_compiled_by_shark()) {
227 shark_java_nmethod_stats.note_nmethod(nm);
228 } else
229 #endif
230 {
231 unknown_java_nmethod_stats.note_nmethod(nm);
232 }
233 }
234 #endif // !PRODUCT
235
236 //---------------------------------------------------------------------------------
237
238
239 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) {
240 assert(pc != NULL, "Must be non null");
241 assert(exception.not_null(), "Must be non null");
242 assert(handler != NULL, "Must be non null");
243
244 _count = 0;
245 _exception_type = exception->klass();
246 _next = NULL;
247
248 add_address_and_handler(pc,handler);
249 }
250
251
252 address ExceptionCache::match(Handle exception, address pc) {
253 assert(pc != NULL,"Must be non null");
254 assert(exception.not_null(),"Must be non null");
255 if (exception->klass() == exception_type()) {
256 return (test_address(pc));
257 }
258
259 return NULL;
260 }
261
262
263 bool ExceptionCache::match_exception_with_space(Handle exception) {
264 assert(exception.not_null(),"Must be non null");
265 if (exception->klass() == exception_type() && count() < cache_size) {
266 return true;
267 }
268 return false;
269 }
270
271
272 address ExceptionCache::test_address(address addr) {
273 int limit = count();
274 for (int i = 0; i < limit; i++) {
275 if (pc_at(i) == addr) {
276 return handler_at(i);
277 }
278 }
279 return NULL;
280 }
281
282
283 bool ExceptionCache::add_address_and_handler(address addr, address handler) {
284 if (test_address(addr) == handler) return true;
285
286 int index = count();
287 if (index < cache_size) {
288 set_pc_at(index, addr);
289 set_handler_at(index, handler);
290 increment_count();
291 return true;
292 }
293 return false;
294 }
295
296 //-----------------------------------------------------------------------------
297
298
299 // Helper used by both find_pc_desc methods.
300 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) {
301 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_tests);
302 if (!approximate)
303 return pc->pc_offset() == pc_offset;
304 else
305 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset();
306 }
307
308 void PcDescCache::reset_to(PcDesc* initial_pc_desc) {
309 if (initial_pc_desc == NULL) {
310 _pc_descs[0] = NULL; // native method; no PcDescs at all
311 return;
312 }
313 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_resets);
314 // reset the cache by filling it with benign (non-null) values
315 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel");
316 for (int i = 0; i < cache_size; i++)
317 _pc_descs[i] = initial_pc_desc;
318 }
319
320 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) {
321 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_queries);
322 NOT_PRODUCT(if (approximate) ++pc_nmethod_stats.pc_desc_approx);
323
324 // Note: one might think that caching the most recently
325 // read value separately would be a win, but one would be
326 // wrong. When many threads are updating it, the cache
327 // line it's in would bounce between caches, negating
328 // any benefit.
329
330 // In order to prevent race conditions do not load cache elements
331 // repeatedly, but use a local copy:
332 PcDesc* res;
333
334 // Step one: Check the most recently added value.
335 res = _pc_descs[0];
336 if (res == NULL) return NULL; // native method; no PcDescs at all
337 if (match_desc(res, pc_offset, approximate)) {
338 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_repeats);
339 return res;
340 }
341
342 // Step two: Check the rest of the LRU cache.
343 for (int i = 1; i < cache_size; ++i) {
344 res = _pc_descs[i];
345 if (res->pc_offset() < 0) break; // optimization: skip empty cache
346 if (match_desc(res, pc_offset, approximate)) {
347 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_hits);
348 return res;
349 }
350 }
351
352 // Report failure.
353 return NULL;
354 }
355
356 void PcDescCache::add_pc_desc(PcDesc* pc_desc) {
357 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_adds);
358 // Update the LRU cache by shifting pc_desc forward.
359 for (int i = 0; i < cache_size; i++) {
360 PcDesc* next = _pc_descs[i];
361 _pc_descs[i] = pc_desc;
362 pc_desc = next;
363 }
364 }
365
366 // adjust pcs_size so that it is a multiple of both oopSize and
367 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple
368 // of oopSize, then 2*sizeof(PcDesc) is)
369 static int adjust_pcs_size(int pcs_size) {
370 int nsize = round_to(pcs_size, oopSize);
371 if ((nsize % sizeof(PcDesc)) != 0) {
372 nsize = pcs_size + sizeof(PcDesc);
373 }
374 assert((nsize % oopSize) == 0, "correct alignment");
375 return nsize;
376 }
377
378
379 int nmethod::total_size() const {
380 return
381 consts_size() +
382 insts_size() +
383 stub_size() +
384 scopes_data_size() +
385 scopes_pcs_size() +
386 handler_table_size() +
387 nul_chk_table_size();
388 }
389
390 const char* nmethod::compile_kind() const {
391 if (is_osr_method()) return "osr";
392 if (method() != NULL && is_native_method()) return "c2n";
393 return NULL;
394 }
395
396 // Fill in default values for various flag fields
397 void nmethod::init_defaults() {
398 _state = in_use;
399 _has_flushed_dependencies = 0;
400 _lock_count = 0;
401 _stack_traversal_mark = 0;
402 _unload_reported = false; // jvmti state
403
404 #ifdef ASSERT
405 _oops_are_stale = false;
406 #endif
407
408 _oops_do_mark_link = NULL;
409 _jmethod_id = NULL;
410 _osr_link = NULL;
411 if (UseG1GC) {
412 _unloading_next = NULL;
413 } else {
414 _scavenge_root_link = NULL;
415 }
416 _scavenge_root_state = 0;
417 #if INCLUDE_RTM_OPT
418 _rtm_state = NoRTM;
419 #endif
420 #if INCLUDE_JVMCI
421 _jvmci_installed_code = NULL;
422 _speculation_log = NULL;
423 #endif
424 }
425
426 nmethod* nmethod::new_native_nmethod(const methodHandle& method,
427 int compile_id,
428 CodeBuffer *code_buffer,
429 int vep_offset,
430 int frame_complete,
431 int frame_size,
432 ByteSize basic_lock_owner_sp_offset,
433 ByteSize basic_lock_sp_offset,
434 OopMapSet* oop_maps) {
435 code_buffer->finalize_oop_references(method);
436 // create nmethod
437 nmethod* nm = NULL;
438 {
439 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
440 int native_nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod));
441 CodeOffsets offsets;
442 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
443 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
444 nm = new (native_nmethod_size, CompLevel_none) nmethod(method(), compiler_none, native_nmethod_size,
445 compile_id, &offsets,
446 code_buffer, frame_size,
447 basic_lock_owner_sp_offset,
448 basic_lock_sp_offset, oop_maps);
449 NOT_PRODUCT(if (nm != NULL) native_nmethod_stats.note_native_nmethod(nm));
450 }
451 // verify nmethod
452 debug_only(if (nm) nm->verify();) // might block
453
454 if (nm != NULL) {
455 nm->log_new_nmethod();
456 }
457
458 return nm;
459 }
460
461 nmethod* nmethod::new_nmethod(const methodHandle& method,
462 int compile_id,
463 int entry_bci,
464 CodeOffsets* offsets,
465 int orig_pc_offset,
466 DebugInformationRecorder* debug_info,
467 Dependencies* dependencies,
468 CodeBuffer* code_buffer, int frame_size,
469 OopMapSet* oop_maps,
470 ExceptionHandlerTable* handler_table,
471 ImplicitExceptionTable* nul_chk_table,
472 AbstractCompiler* compiler,
473 int comp_level
474 #if INCLUDE_JVMCI
475 , Handle installed_code,
476 Handle speculationLog
477 #endif
478 )
479 {
480 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
481 code_buffer->finalize_oop_references(method);
482 // create nmethod
483 nmethod* nm = NULL;
484 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
485 int nmethod_size =
486 CodeBlob::allocation_size(code_buffer, sizeof(nmethod))
487 + adjust_pcs_size(debug_info->pcs_size())
488 + round_to(dependencies->size_in_bytes() , oopSize)
489 + round_to(handler_table->size_in_bytes(), oopSize)
490 + round_to(nul_chk_table->size_in_bytes(), oopSize)
491 + round_to(debug_info->data_size() , oopSize);
492
493 nm = new (nmethod_size, comp_level)
494 nmethod(method(), compiler->type(), nmethod_size, compile_id, entry_bci, offsets,
495 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size,
496 oop_maps,
497 handler_table,
498 nul_chk_table,
499 compiler,
500 comp_level
501 #if INCLUDE_JVMCI
502 , installed_code,
503 speculationLog
504 #endif
505 );
506
507 if (nm != NULL) {
508 // To make dependency checking during class loading fast, record
509 // the nmethod dependencies in the classes it is dependent on.
510 // This allows the dependency checking code to simply walk the
511 // class hierarchy above the loaded class, checking only nmethods
512 // which are dependent on those classes. The slow way is to
513 // check every nmethod for dependencies which makes it linear in
514 // the number of methods compiled. For applications with a lot
515 // classes the slow way is too slow.
516 for (Dependencies::DepStream deps(nm); deps.next(); ) {
517 if (deps.type() == Dependencies::call_site_target_value) {
518 // CallSite dependencies are managed on per-CallSite instance basis.
519 oop call_site = deps.argument_oop(0);
520 MethodHandles::add_dependent_nmethod(call_site, nm);
521 } else {
522 Klass* klass = deps.context_type();
523 if (klass == NULL) {
524 continue; // ignore things like evol_method
525 }
526 // record this nmethod as dependent on this klass
527 InstanceKlass::cast(klass)->add_dependent_nmethod(nm);
528 }
529 }
530 NOT_PRODUCT(if (nm != NULL) note_java_nmethod(nm));
531 }
532 }
533 // Do verification and logging outside CodeCache_lock.
534 if (nm != NULL) {
535 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
536 DEBUG_ONLY(nm->verify();)
537 nm->log_new_nmethod();
538 }
539 return nm;
540 }
541
542 // For native wrappers
543 nmethod::nmethod(
544 Method* method,
545 CompilerType type,
546 int nmethod_size,
547 int compile_id,
548 CodeOffsets* offsets,
549 CodeBuffer* code_buffer,
550 int frame_size,
551 ByteSize basic_lock_owner_sp_offset,
552 ByteSize basic_lock_sp_offset,
553 OopMapSet* oop_maps )
554 : CompiledMethod(method, "native nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false),
555 _native_receiver_sp_offset(basic_lock_owner_sp_offset),
556 _native_basic_lock_sp_offset(basic_lock_sp_offset)
557 {
558 {
559 int scopes_data_offset = 0;
560 int deoptimize_offset = 0;
561 int deoptimize_mh_offset = 0;
562
563 debug_only(NoSafepointVerifier nsv;)
564 assert_locked_or_safepoint(CodeCache_lock);
565
566 init_defaults();
567 _entry_bci = InvocationEntryBci;
568 // We have no exception handler or deopt handler make the
569 // values something that will never match a pc like the nmethod vtable entry
570 _exception_offset = 0;
571 _orig_pc_offset = 0;
572
573 _consts_offset = data_offset();
574 _stub_offset = data_offset();
575 _oops_offset = data_offset();
576 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize);
577 scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize);
578 _scopes_pcs_offset = scopes_data_offset;
579 _dependencies_offset = _scopes_pcs_offset;
580 _handler_table_offset = _dependencies_offset;
581 _nul_chk_table_offset = _handler_table_offset;
582 _nmethod_end_offset = _nul_chk_table_offset;
583 _compile_id = compile_id;
584 _comp_level = CompLevel_none;
585 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
586 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
587 _osr_entry_point = NULL;
588 _exception_cache = NULL;
589 _pc_desc_container.reset_to(NULL);
590 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
591
592 _scopes_data_begin = (address) this + scopes_data_offset;
593 _deopt_handler_begin = (address) this + deoptimize_offset;
594 _deopt_mh_handler_begin = (address) this + deoptimize_mh_offset;
595
596 code_buffer->copy_code_and_locs_to(this);
597 code_buffer->copy_values_to(this);
598 if (ScavengeRootsInCode) {
599 if (detect_scavenge_root_oops()) {
600 CodeCache::add_scavenge_root_nmethod(this);
601 }
602 GC::gc()->heap()->register_nmethod(this);
603 }
604 debug_only(verify_scavenge_root_oops());
605 CodeCache::commit(this);
606 }
607
608 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
609 ttyLocker ttyl; // keep the following output all in one block
610 // This output goes directly to the tty, not the compiler log.
611 // To enable tools to match it up with the compilation activity,
612 // be sure to tag this tty output with the compile ID.
613 if (xtty != NULL) {
614 xtty->begin_head("print_native_nmethod");
615 xtty->method(_method);
616 xtty->stamp();
617 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
618 }
619 // print the header part first
620 print();
621 // then print the requested information
622 if (PrintNativeNMethods) {
623 print_code();
624 if (oop_maps != NULL) {
625 oop_maps->print();
626 }
627 }
628 if (PrintRelocations) {
629 print_relocations();
630 }
631 if (xtty != NULL) {
632 xtty->tail("print_native_nmethod");
633 }
634 }
635 }
636
637 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () {
638 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level));
639 }
640
641 nmethod::nmethod(
642 Method* method,
643 CompilerType type,
644 int nmethod_size,
645 int compile_id,
646 int entry_bci,
647 CodeOffsets* offsets,
648 int orig_pc_offset,
649 DebugInformationRecorder* debug_info,
650 Dependencies* dependencies,
651 CodeBuffer *code_buffer,
652 int frame_size,
653 OopMapSet* oop_maps,
654 ExceptionHandlerTable* handler_table,
655 ImplicitExceptionTable* nul_chk_table,
656 AbstractCompiler* compiler,
657 int comp_level
658 #if INCLUDE_JVMCI
659 , Handle installed_code,
660 Handle speculation_log
661 #endif
662 )
663 : CompiledMethod(method, "nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false),
664 _native_receiver_sp_offset(in_ByteSize(-1)),
665 _native_basic_lock_sp_offset(in_ByteSize(-1))
666 {
667 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
668 {
669 debug_only(NoSafepointVerifier nsv;)
670 assert_locked_or_safepoint(CodeCache_lock);
671
672 _deopt_handler_begin = (address) this;
673 _deopt_mh_handler_begin = (address) this;
674
675 init_defaults();
676 _entry_bci = entry_bci;
677 _compile_id = compile_id;
678 _comp_level = comp_level;
679 _orig_pc_offset = orig_pc_offset;
680 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
681
682 // Section offsets
683 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts());
684 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs());
685 set_ctable_begin(header_begin() + _consts_offset);
686
687 #if INCLUDE_JVMCI
688 _jvmci_installed_code = installed_code();
689 _speculation_log = (instanceOop)speculation_log();
690
691 if (compiler->is_jvmci()) {
692 // JVMCI might not produce any stub sections
693 if (offsets->value(CodeOffsets::Exceptions) != -1) {
694 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions);
695 } else {
696 _exception_offset = -1;
697 }
698 if (offsets->value(CodeOffsets::Deopt) != -1) {
699 _deopt_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::Deopt);
700 } else {
701 _deopt_handler_begin = NULL;
702 }
703 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
704 _deopt_mh_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::DeoptMH);
705 } else {
706 _deopt_mh_handler_begin = NULL;
707 }
708 } else {
709 #endif
710 // Exception handler and deopt handler are in the stub section
711 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set");
712 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set");
713
714 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
715 _deopt_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::Deopt);
716 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
717 _deopt_mh_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::DeoptMH);
718 } else {
719 _deopt_mh_handler_begin = NULL;
720 #if INCLUDE_JVMCI
721 }
722 #endif
723 }
724 if (offsets->value(CodeOffsets::UnwindHandler) != -1) {
725 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler);
726 } else {
727 _unwind_handler_offset = -1;
728 }
729
730 _oops_offset = data_offset();
731 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize);
732 int scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize);
733
734 _scopes_pcs_offset = scopes_data_offset + round_to(debug_info->data_size (), oopSize);
735 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
736 _handler_table_offset = _dependencies_offset + round_to(dependencies->size_in_bytes (), oopSize);
737 _nul_chk_table_offset = _handler_table_offset + round_to(handler_table->size_in_bytes(), oopSize);
738 _nmethod_end_offset = _nul_chk_table_offset + round_to(nul_chk_table->size_in_bytes(), oopSize);
739 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
740 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
741 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry);
742 _exception_cache = NULL;
743
744 _scopes_data_begin = (address) this + scopes_data_offset;
745
746 _pc_desc_container.reset_to(scopes_pcs_begin());
747
748 code_buffer->copy_code_and_locs_to(this);
749 // Copy contents of ScopeDescRecorder to nmethod
750 code_buffer->copy_values_to(this);
751 debug_info->copy_to(this);
752 dependencies->copy_to(this);
753 if (ScavengeRootsInCode) {
754 if (detect_scavenge_root_oops()) {
755 CodeCache::add_scavenge_root_nmethod(this);
756 }
757 GC::gc()->heap()->register_nmethod(this);
758 }
759 debug_only(verify_scavenge_root_oops());
760
761 CodeCache::commit(this);
762
763 // Copy contents of ExceptionHandlerTable to nmethod
764 handler_table->copy_to(this);
765 nul_chk_table->copy_to(this);
766
767 // we use the information of entry points to find out if a method is
768 // static or non static
769 assert(compiler->is_c2() || compiler->is_jvmci() ||
770 _method->is_static() == (entry_point() == _verified_entry_point),
771 " entry points must be same for static methods and vice versa");
772 }
773 }
774
775 // Print a short set of xml attributes to identify this nmethod. The
776 // output should be embedded in some other element.
777 void nmethod::log_identity(xmlStream* log) const {
778 log->print(" compile_id='%d'", compile_id());
779 const char* nm_kind = compile_kind();
780 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind);
781 log->print(" compiler='%s'", compiler_name());
782 if (TieredCompilation) {
783 log->print(" level='%d'", comp_level());
784 }
785 }
786
787
788 #define LOG_OFFSET(log, name) \
789 if (p2i(name##_end()) - p2i(name##_begin())) \
790 log->print(" " XSTR(name) "_offset='" INTX_FORMAT "'" , \
791 p2i(name##_begin()) - p2i(this))
792
793
794 void nmethod::log_new_nmethod() const {
795 if (LogCompilation && xtty != NULL) {
796 ttyLocker ttyl;
797 HandleMark hm;
798 xtty->begin_elem("nmethod");
799 log_identity(xtty);
800 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size());
801 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this));
802
803 LOG_OFFSET(xtty, relocation);
804 LOG_OFFSET(xtty, consts);
805 LOG_OFFSET(xtty, insts);
806 LOG_OFFSET(xtty, stub);
807 LOG_OFFSET(xtty, scopes_data);
808 LOG_OFFSET(xtty, scopes_pcs);
809 LOG_OFFSET(xtty, dependencies);
810 LOG_OFFSET(xtty, handler_table);
811 LOG_OFFSET(xtty, nul_chk_table);
812 LOG_OFFSET(xtty, oops);
813 LOG_OFFSET(xtty, metadata);
814
815 xtty->method(method());
816 xtty->stamp();
817 xtty->end_elem();
818 }
819 }
820
821 #undef LOG_OFFSET
822
823
824 // Print out more verbose output usually for a newly created nmethod.
825 void nmethod::print_on(outputStream* st, const char* msg) const {
826 if (st != NULL) {
827 ttyLocker ttyl;
828 if (WizardMode) {
829 CompileTask::print(st, this, msg, /*short_form:*/ true);
830 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this));
831 } else {
832 CompileTask::print(st, this, msg, /*short_form:*/ false);
833 }
834 }
835 }
836
837 void nmethod::maybe_print_nmethod(DirectiveSet* directive) {
838 bool printnmethods = directive->PrintAssemblyOption || directive->PrintNMethodsOption;
839 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
840 print_nmethod(printnmethods);
841 }
842 }
843
844 void nmethod::print_nmethod(bool printmethod) {
845 ttyLocker ttyl; // keep the following output all in one block
846 if (xtty != NULL) {
847 xtty->begin_head("print_nmethod");
848 xtty->stamp();
849 xtty->end_head();
850 }
851 // print the header part first
852 print();
853 // then print the requested information
854 if (printmethod) {
855 print_code();
856 print_pcs();
857 if (oop_maps()) {
858 oop_maps()->print();
859 }
860 }
861 if (printmethod || PrintDebugInfo || CompilerOracle::has_option_string(_method, "PrintDebugInfo")) {
862 print_scopes();
863 }
864 if (printmethod || PrintRelocations || CompilerOracle::has_option_string(_method, "PrintRelocations")) {
865 print_relocations();
866 }
867 if (printmethod || PrintDependencies || CompilerOracle::has_option_string(_method, "PrintDependencies")) {
868 print_dependencies();
869 }
870 if (printmethod || PrintExceptionHandlers) {
871 print_handler_table();
872 print_nul_chk_table();
873 }
874 if (printmethod) {
875 print_recorded_oops();
876 print_recorded_metadata();
877 }
878 if (xtty != NULL) {
879 xtty->tail("print_nmethod");
880 }
881 }
882
883
884 // Promote one word from an assembly-time handle to a live embedded oop.
885 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
886 if (handle == NULL ||
887 // As a special case, IC oops are initialized to 1 or -1.
888 handle == (jobject) Universe::non_oop_word()) {
889 (*dest) = (oop) handle;
890 } else {
891 (*dest) = JNIHandles::resolve_non_null(handle);
892 }
893 }
894
895
896 // Have to have the same name because it's called by a template
897 void nmethod::copy_values(GrowableArray<jobject>* array) {
898 int length = array->length();
899 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
900 oop* dest = oops_begin();
901 for (int index = 0 ; index < length; index++) {
902 initialize_immediate_oop(&dest[index], array->at(index));
903 }
904
905 // Now we can fix up all the oops in the code. We need to do this
906 // in the code because the assembler uses jobjects as placeholders.
907 // The code and relocations have already been initialized by the
908 // CodeBlob constructor, so it is valid even at this early point to
909 // iterate over relocations and patch the code.
910 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true);
911 }
912
913 void nmethod::copy_values(GrowableArray<Metadata*>* array) {
914 int length = array->length();
915 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough");
916 Metadata** dest = metadata_begin();
917 for (int index = 0 ; index < length; index++) {
918 dest[index] = array->at(index);
919 }
920 }
921
922 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) {
923 // re-patch all oop-bearing instructions, just in case some oops moved
924 RelocIterator iter(this, begin, end);
925 while (iter.next()) {
926 if (iter.type() == relocInfo::oop_type) {
927 oop_Relocation* reloc = iter.oop_reloc();
928 if (initialize_immediates && reloc->oop_is_immediate()) {
929 oop* dest = reloc->oop_addr();
930 initialize_immediate_oop(dest, (jobject) *dest);
931 }
932 // Refresh the oop-related bits of this instruction.
933 reloc->fix_oop_relocation();
934 } else if (iter.type() == relocInfo::metadata_type) {
935 metadata_Relocation* reloc = iter.metadata_reloc();
936 reloc->fix_metadata_relocation();
937 }
938 }
939 }
940
941
942 void nmethod::verify_clean_inline_caches() {
943 assert_locked_or_safepoint(CompiledIC_lock);
944
945 // If the method is not entrant or zombie then a JMP is plastered over the
946 // first few bytes. If an oop in the old code was there, that oop
947 // should not get GC'd. Skip the first few bytes of oops on
948 // not-entrant methods.
949 address low_boundary = verified_entry_point();
950 if (!is_in_use()) {
951 low_boundary += NativeJump::instruction_size;
952 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
953 // This means that the low_boundary is going to be a little too high.
954 // This shouldn't matter, since oops of non-entrant methods are never used.
955 // In fact, why are we bothering to look at oops in a non-entrant method??
956 }
957
958 ResourceMark rm;
959 RelocIterator iter(this, low_boundary);
960 while(iter.next()) {
961 switch(iter.type()) {
962 case relocInfo::virtual_call_type:
963 case relocInfo::opt_virtual_call_type: {
964 CompiledIC *ic = CompiledIC_at(&iter);
965 // Ok, to lookup references to zombies here
966 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
967 nmethod* nm = cb->as_nmethod_or_null();
968 if( nm != NULL ) {
969 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
970 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
971 assert(ic->is_clean(), "IC should be clean");
972 }
973 }
974 break;
975 }
976 case relocInfo::static_call_type: {
977 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
978 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
979 nmethod* nm = cb->as_nmethod_or_null();
980 if( nm != NULL ) {
981 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
982 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
983 assert(csc->is_clean(), "IC should be clean");
984 }
985 }
986 break;
987 }
988 }
989 }
990 }
991
992 // This is a private interface with the sweeper.
993 void nmethod::mark_as_seen_on_stack() {
994 assert(is_alive(), "Must be an alive method");
995 // Set the traversal mark to ensure that the sweeper does 2
996 // cleaning passes before moving to zombie.
997 set_stack_traversal_mark(NMethodSweeper::traversal_count());
998 }
999
1000 // Tell if a non-entrant method can be converted to a zombie (i.e.,
1001 // there are no activations on the stack, not in use by the VM,
1002 // and not in use by the ServiceThread)
1003 bool nmethod::can_convert_to_zombie() {
1004 assert(is_not_entrant(), "must be a non-entrant method");
1005
1006 // Since the nmethod sweeper only does partial sweep the sweeper's traversal
1007 // count can be greater than the stack traversal count before it hits the
1008 // nmethod for the second time.
1009 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count() &&
1010 !is_locked_by_vm();
1011 }
1012
1013 void nmethod::inc_decompile_count() {
1014 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return;
1015 // Could be gated by ProfileTraps, but do not bother...
1016 Method* m = method();
1017 if (m == NULL) return;
1018 MethodData* mdo = m->method_data();
1019 if (mdo == NULL) return;
1020 // There is a benign race here. See comments in methodData.hpp.
1021 mdo->inc_decompile_count();
1022 }
1023
1024 void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) {
1025
1026 post_compiled_method_unload();
1027
1028 // Since this nmethod is being unloaded, make sure that dependencies
1029 // recorded in instanceKlasses get flushed and pass non-NULL closure to
1030 // indicate that this work is being done during a GC.
1031 assert(GC::gc()->heap()->is_gc_active(), "should only be called during gc");
1032 assert(is_alive != NULL, "Should be non-NULL");
1033 // A non-NULL is_alive closure indicates that this is being called during GC.
1034 flush_dependencies(is_alive);
1035
1036 // Break cycle between nmethod & method
1037 if (log_is_enabled(Trace, class, unload)) {
1038 outputStream* log = Log(class, unload)::trace_stream();
1039 log->print_cr("making nmethod " INTPTR_FORMAT
1040 " unloadable, Method*(" INTPTR_FORMAT
1041 "), cause(" INTPTR_FORMAT ")",
1042 p2i(this), p2i(_method), p2i(cause));
1043 if (!GC::gc()->heap()->is_gc_active())
1044 cause->klass()->print_on(log);
1045 }
1046 // Unlink the osr method, so we do not look this up again
1047 if (is_osr_method()) {
1048 // Invalidate the osr nmethod only once
1049 if (is_in_use()) {
1050 invalidate_osr_method();
1051 }
1052 #ifdef ASSERT
1053 if (method() != NULL) {
1054 // Make sure osr nmethod is invalidated, i.e. not on the list
1055 bool found = method()->method_holder()->remove_osr_nmethod(this);
1056 assert(!found, "osr nmethod should have been invalidated");
1057 }
1058 #endif
1059 }
1060
1061 // If _method is already NULL the Method* is about to be unloaded,
1062 // so we don't have to break the cycle. Note that it is possible to
1063 // have the Method* live here, in case we unload the nmethod because
1064 // it is pointing to some oop (other than the Method*) being unloaded.
1065 if (_method != NULL) {
1066 // OSR methods point to the Method*, but the Method* does not
1067 // point back!
1068 if (_method->code() == this) {
1069 _method->clear_code(); // Break a cycle
1070 }
1071 _method = NULL; // Clear the method of this dead nmethod
1072 }
1073
1074 // Make the class unloaded - i.e., change state and notify sweeper
1075 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
1076 if (is_in_use()) {
1077 // Transitioning directly from live to unloaded -- so
1078 // we need to force a cache clean-up; remember this
1079 // for later on.
1080 CodeCache::set_needs_cache_clean(true);
1081 }
1082
1083 // Unregister must be done before the state change
1084 GC::gc()->heap()->unregister_nmethod(this);
1085
1086 _state = unloaded;
1087
1088 // Log the unloading.
1089 log_state_change();
1090
1091 #if INCLUDE_JVMCI
1092 // The method can only be unloaded after the pointer to the installed code
1093 // Java wrapper is no longer alive. Here we need to clear out this weak
1094 // reference to the dead object. Nulling out the reference has to happen
1095 // after the method is unregistered since the original value may be still
1096 // tracked by the rset.
1097 maybe_invalidate_installed_code();
1098 // Clear these out after the nmethod has been unregistered and any
1099 // updates to the InstalledCode instance have been performed.
1100 _jvmci_installed_code = NULL;
1101 _speculation_log = NULL;
1102 #endif
1103
1104 // The Method* is gone at this point
1105 assert(_method == NULL, "Tautology");
1106
1107 set_osr_link(NULL);
1108 NMethodSweeper::report_state_change(this);
1109 }
1110
1111 void nmethod::invalidate_osr_method() {
1112 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
1113 // Remove from list of active nmethods
1114 if (method() != NULL) {
1115 method()->method_holder()->remove_osr_nmethod(this);
1116 }
1117 }
1118
1119 void nmethod::log_state_change() const {
1120 if (LogCompilation) {
1121 if (xtty != NULL) {
1122 ttyLocker ttyl; // keep the following output all in one block
1123 if (_state == unloaded) {
1124 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'",
1125 os::current_thread_id());
1126 } else {
1127 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s",
1128 os::current_thread_id(),
1129 (_state == zombie ? " zombie='1'" : ""));
1130 }
1131 log_identity(xtty);
1132 xtty->stamp();
1133 xtty->end_elem();
1134 }
1135 }
1136 if (PrintCompilation && _state != unloaded) {
1137 print_on(tty, _state == zombie ? "made zombie" : "made not entrant");
1138 }
1139 }
1140
1141 /**
1142 * Common functionality for both make_not_entrant and make_zombie
1143 */
1144 bool nmethod::make_not_entrant_or_zombie(unsigned int state) {
1145 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant");
1146 assert(!is_zombie(), "should not already be a zombie");
1147
1148 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below.
1149 nmethodLocker nml(this);
1150 methodHandle the_method(method());
1151 NoSafepointVerifier nsv;
1152
1153 // during patching, depending on the nmethod state we must notify the GC that
1154 // code has been unloaded, unregistering it. We cannot do this right while
1155 // holding the Patching_lock because we need to use the CodeCache_lock. This
1156 // would be prone to deadlocks.
1157 // This flag is used to remember whether we need to later lock and unregister.
1158 bool nmethod_needs_unregister = false;
1159
1160 {
1161 // invalidate osr nmethod before acquiring the patching lock since
1162 // they both acquire leaf locks and we don't want a deadlock.
1163 // This logic is equivalent to the logic below for patching the
1164 // verified entry point of regular methods. We check that the
1165 // nmethod is in use to ensure that it is invalidated only once.
1166 if (is_osr_method() && is_in_use()) {
1167 // this effectively makes the osr nmethod not entrant
1168 invalidate_osr_method();
1169 }
1170
1171 // Enter critical section. Does not block for safepoint.
1172 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1173
1174 if (_state == state) {
1175 // another thread already performed this transition so nothing
1176 // to do, but return false to indicate this.
1177 return false;
1178 }
1179
1180 // The caller can be calling the method statically or through an inline
1181 // cache call.
1182 if (!is_osr_method() && !is_not_entrant()) {
1183 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
1184 SharedRuntime::get_handle_wrong_method_stub());
1185 }
1186
1187 if (is_in_use() && update_recompile_counts()) {
1188 // It's a true state change, so mark the method as decompiled.
1189 // Do it only for transition from alive.
1190 inc_decompile_count();
1191 }
1192
1193 // If the state is becoming a zombie, signal to unregister the nmethod with
1194 // the heap.
1195 // This nmethod may have already been unloaded during a full GC.
1196 if ((state == zombie) && !is_unloaded()) {
1197 nmethod_needs_unregister = true;
1198 }
1199
1200 // Must happen before state change. Otherwise we have a race condition in
1201 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately
1202 // transition its state from 'not_entrant' to 'zombie' without having to wait
1203 // for stack scanning.
1204 if (state == not_entrant) {
1205 mark_as_seen_on_stack();
1206 OrderAccess::storestore();
1207 }
1208
1209 // Change state
1210 _state = state;
1211
1212 // Log the transition once
1213 log_state_change();
1214
1215 // Invalidate while holding the patching lock
1216 JVMCI_ONLY(maybe_invalidate_installed_code());
1217
1218 // Remove nmethod from method.
1219 // We need to check if both the _code and _from_compiled_code_entry_point
1220 // refer to this nmethod because there is a race in setting these two fields
1221 // in Method* as seen in bugid 4947125.
1222 // If the vep() points to the zombie nmethod, the memory for the nmethod
1223 // could be flushed and the compiler and vtable stubs could still call
1224 // through it.
1225 if (method() != NULL && (method()->code() == this ||
1226 method()->from_compiled_entry() == verified_entry_point())) {
1227 HandleMark hm;
1228 method()->clear_code(false /* already owns Patching_lock */);
1229 }
1230 } // leave critical region under Patching_lock
1231
1232 #ifdef ASSERT
1233 if (is_osr_method() && method() != NULL) {
1234 // Make sure osr nmethod is invalidated, i.e. not on the list
1235 bool found = method()->method_holder()->remove_osr_nmethod(this);
1236 assert(!found, "osr nmethod should have been invalidated");
1237 }
1238 #endif
1239
1240 // When the nmethod becomes zombie it is no longer alive so the
1241 // dependencies must be flushed. nmethods in the not_entrant
1242 // state will be flushed later when the transition to zombie
1243 // happens or they get unloaded.
1244 if (state == zombie) {
1245 {
1246 // Flushing dependencies must be done before any possible
1247 // safepoint can sneak in, otherwise the oops used by the
1248 // dependency logic could have become stale.
1249 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1250 if (nmethod_needs_unregister) {
1251 GC::gc()->heap()->unregister_nmethod(this);
1252 #ifdef JVMCI
1253 _jvmci_installed_code = NULL;
1254 _speculation_log = NULL;
1255 #endif
1256 }
1257 flush_dependencies(NULL);
1258 }
1259
1260 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload
1261 // event and it hasn't already been reported for this nmethod then
1262 // report it now. The event may have been reported earlier if the GC
1263 // marked it for unloading). JvmtiDeferredEventQueue support means
1264 // we no longer go to a safepoint here.
1265 post_compiled_method_unload();
1266
1267 #ifdef ASSERT
1268 // It's no longer safe to access the oops section since zombie
1269 // nmethods aren't scanned for GC.
1270 _oops_are_stale = true;
1271 #endif
1272 // the Method may be reclaimed by class unloading now that the
1273 // nmethod is in zombie state
1274 set_method(NULL);
1275 } else {
1276 assert(state == not_entrant, "other cases may need to be handled differently");
1277 }
1278
1279 if (TraceCreateZombies) {
1280 ResourceMark m;
1281 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");
1282 }
1283
1284 NMethodSweeper::report_state_change(this);
1285 return true;
1286 }
1287
1288 void nmethod::flush() {
1289 // Note that there are no valid oops in the nmethod anymore.
1290 assert(!is_osr_method() || is_unloaded() || is_zombie(),
1291 "osr nmethod must be unloaded or zombie before flushing");
1292 assert(is_zombie() || is_osr_method(), "must be a zombie method");
1293 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed");
1294 assert_locked_or_safepoint(CodeCache_lock);
1295
1296 // completely deallocate this method
1297 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, p2i(this));
1298 if (PrintMethodFlushing) {
1299 tty->print_cr("*flushing %s nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT
1300 "/Free CodeCache:" SIZE_FORMAT "Kb",
1301 is_osr_method() ? "osr" : "",_compile_id, p2i(this), CodeCache::blob_count(),
1302 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024);
1303 }
1304
1305 // We need to deallocate any ExceptionCache data.
1306 // Note that we do not need to grab the nmethod lock for this, it
1307 // better be thread safe if we're disposing of it!
1308 ExceptionCache* ec = exception_cache();
1309 set_exception_cache(NULL);
1310 while(ec != NULL) {
1311 ExceptionCache* next = ec->next();
1312 delete ec;
1313 ec = next;
1314 }
1315
1316 if (on_scavenge_root_list()) {
1317 CodeCache::drop_scavenge_root_nmethod(this);
1318 }
1319
1320 #ifdef SHARK
1321 ((SharkCompiler *) compiler())->free_compiled_method(insts_begin());
1322 #endif // SHARK
1323
1324 CodeBlob::flush();
1325 CodeCache::free(this);
1326 }
1327
1328 //
1329 // Notify all classes this nmethod is dependent on that it is no
1330 // longer dependent. This should only be called in two situations.
1331 // First, when a nmethod transitions to a zombie all dependents need
1332 // to be clear. Since zombification happens at a safepoint there's no
1333 // synchronization issues. The second place is a little more tricky.
1334 // During phase 1 of mark sweep class unloading may happen and as a
1335 // result some nmethods may get unloaded. In this case the flushing
1336 // of dependencies must happen during phase 1 since after GC any
1337 // dependencies in the unloaded nmethod won't be updated, so
1338 // traversing the dependency information in unsafe. In that case this
1339 // function is called with a non-NULL argument and this function only
1340 // notifies instanceKlasses that are reachable
1341
1342 void nmethod::flush_dependencies(BoolObjectClosure* is_alive) {
1343 assert_locked_or_safepoint(CodeCache_lock);
1344 assert(GC::gc()->heap()->is_gc_active() == (is_alive != NULL),
1345 "is_alive is non-NULL if and only if we are called during GC");
1346 if (!has_flushed_dependencies()) {
1347 set_has_flushed_dependencies();
1348 for (Dependencies::DepStream deps(this); deps.next(); ) {
1349 if (deps.type() == Dependencies::call_site_target_value) {
1350 // CallSite dependencies are managed on per-CallSite instance basis.
1351 oop call_site = deps.argument_oop(0);
1352 MethodHandles::remove_dependent_nmethod(call_site, this);
1353 } else {
1354 Klass* klass = deps.context_type();
1355 if (klass == NULL) {
1356 continue; // ignore things like evol_method
1357 }
1358 // During GC the is_alive closure is non-NULL, and is used to
1359 // determine liveness of dependees that need to be updated.
1360 if (is_alive == NULL || klass->is_loader_alive(is_alive)) {
1361 // The GC defers deletion of this entry, since there might be multiple threads
1362 // iterating over the _dependencies graph. Other call paths are single-threaded
1363 // and may delete it immediately.
1364 bool delete_immediately = is_alive == NULL;
1365 InstanceKlass::cast(klass)->remove_dependent_nmethod(this, delete_immediately);
1366 }
1367 }
1368 }
1369 }
1370 }
1371
1372
1373 // If this oop is not live, the nmethod can be unloaded.
1374 bool nmethod::can_unload(BoolObjectClosure* is_alive, oop* root, bool unloading_occurred) {
1375 assert(root != NULL, "just checking");
1376 oop obj = *root;
1377 if (obj == NULL || is_alive->do_object_b(obj)) {
1378 return false;
1379 }
1380
1381 // If ScavengeRootsInCode is true, an nmethod might be unloaded
1382 // simply because one of its constant oops has gone dead.
1383 // No actual classes need to be unloaded in order for this to occur.
1384 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading");
1385 make_unloaded(is_alive, obj);
1386 return true;
1387 }
1388
1389 // ------------------------------------------------------------------
1390 // post_compiled_method_load_event
1391 // new method for install_code() path
1392 // Transfer information from compilation to jvmti
1393 void nmethod::post_compiled_method_load_event() {
1394
1395 Method* moop = method();
1396 HOTSPOT_COMPILED_METHOD_LOAD(
1397 (char *) moop->klass_name()->bytes(),
1398 moop->klass_name()->utf8_length(),
1399 (char *) moop->name()->bytes(),
1400 moop->name()->utf8_length(),
1401 (char *) moop->signature()->bytes(),
1402 moop->signature()->utf8_length(),
1403 insts_begin(), insts_size());
1404
1405 if (JvmtiExport::should_post_compiled_method_load() ||
1406 JvmtiExport::should_post_compiled_method_unload()) {
1407 get_and_cache_jmethod_id();
1408 }
1409
1410 if (JvmtiExport::should_post_compiled_method_load()) {
1411 // Let the Service thread (which is a real Java thread) post the event
1412 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1413 JvmtiDeferredEventQueue::enqueue(
1414 JvmtiDeferredEvent::compiled_method_load_event(this));
1415 }
1416 }
1417
1418 jmethodID nmethod::get_and_cache_jmethod_id() {
1419 if (_jmethod_id == NULL) {
1420 // Cache the jmethod_id since it can no longer be looked up once the
1421 // method itself has been marked for unloading.
1422 _jmethod_id = method()->jmethod_id();
1423 }
1424 return _jmethod_id;
1425 }
1426
1427 void nmethod::post_compiled_method_unload() {
1428 if (unload_reported()) {
1429 // During unloading we transition to unloaded and then to zombie
1430 // and the unloading is reported during the first transition.
1431 return;
1432 }
1433
1434 assert(_method != NULL && !is_unloaded(), "just checking");
1435 DTRACE_METHOD_UNLOAD_PROBE(method());
1436
1437 // If a JVMTI agent has enabled the CompiledMethodUnload event then
1438 // post the event. Sometime later this nmethod will be made a zombie
1439 // by the sweeper but the Method* will not be valid at that point.
1440 // If the _jmethod_id is null then no load event was ever requested
1441 // so don't bother posting the unload. The main reason for this is
1442 // that the jmethodID is a weak reference to the Method* so if
1443 // it's being unloaded there's no way to look it up since the weak
1444 // ref will have been cleared.
1445 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) {
1446 assert(!unload_reported(), "already unloaded");
1447 JvmtiDeferredEvent event =
1448 JvmtiDeferredEvent::compiled_method_unload_event(this,
1449 _jmethod_id, insts_begin());
1450 if (SafepointSynchronize::is_at_safepoint()) {
1451 // Don't want to take the queueing lock. Add it as pending and
1452 // it will get enqueued later.
1453 JvmtiDeferredEventQueue::add_pending_event(event);
1454 } else {
1455 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
1456 JvmtiDeferredEventQueue::enqueue(event);
1457 }
1458 }
1459
1460 // The JVMTI CompiledMethodUnload event can be enabled or disabled at
1461 // any time. As the nmethod is being unloaded now we mark it has
1462 // having the unload event reported - this will ensure that we don't
1463 // attempt to report the event in the unlikely scenario where the
1464 // event is enabled at the time the nmethod is made a zombie.
1465 set_unload_reported();
1466 }
1467
1468 bool nmethod::unload_if_dead_at(RelocIterator* iter_at_oop, BoolObjectClosure *is_alive, bool unloading_occurred) {
1469 assert(iter_at_oop->type() == relocInfo::oop_type, "Wrong relocation type");
1470
1471 oop_Relocation* r = iter_at_oop->oop_reloc();
1472 // Traverse those oops directly embedded in the code.
1473 // Other oops (oop_index>0) are seen as part of scopes_oops.
1474 assert(1 == (r->oop_is_immediate()) +
1475 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1476 "oop must be found in exactly one place");
1477 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1478 // Unload this nmethod if the oop is dead.
1479 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) {
1480 return true;;
1481 }
1482 }
1483
1484 return false;
1485 }
1486
1487 bool nmethod::do_unloading_scopes(BoolObjectClosure* is_alive, bool unloading_occurred) {
1488 // Scopes
1489 for (oop* p = oops_begin(); p < oops_end(); p++) {
1490 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1491 if (can_unload(is_alive, p, unloading_occurred)) {
1492 return true;
1493 }
1494 }
1495 return false;
1496 }
1497
1498 bool nmethod::do_unloading_oops(address low_boundary, BoolObjectClosure* is_alive, bool unloading_occurred) {
1499 // Compiled code
1500 {
1501 RelocIterator iter(this, low_boundary);
1502 while (iter.next()) {
1503 if (iter.type() == relocInfo::oop_type) {
1504 if (unload_if_dead_at(&iter, is_alive, unloading_occurred)) {
1505 return true;
1506 }
1507 }
1508 }
1509 }
1510
1511 return do_unloading_scopes(is_alive, unloading_occurred);
1512 }
1513
1514 #if INCLUDE_JVMCI
1515 bool nmethod::do_unloading_jvmci(BoolObjectClosure* is_alive, bool unloading_occurred) {
1516 bool is_unloaded = false;
1517 // Follow JVMCI method
1518 BarrierSet* bs = GC::gc()->heap()->barrier_set();
1519 if (_jvmci_installed_code != NULL) {
1520 if (_jvmci_installed_code->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(_jvmci_installed_code)) {
1521 if (!is_alive->do_object_b(_jvmci_installed_code)) {
1522 clear_jvmci_installed_code();
1523 }
1524 } else {
1525 if (can_unload(is_alive, (oop*)&_jvmci_installed_code, unloading_occurred)) {
1526 return true;
1527 }
1528 }
1529 }
1530
1531 if (_speculation_log != NULL) {
1532 if (!is_alive->do_object_b(_speculation_log)) {
1533 bs->write_ref_nmethod_pre(&_speculation_log, this);
1534 _speculation_log = NULL;
1535 bs->write_ref_nmethod_post(&_speculation_log, this);
1536 }
1537 }
1538 return is_unloaded;
1539 }
1540 #endif
1541
1542 // Iterate over metadata calling this function. Used by RedefineClasses
1543 void nmethod::metadata_do(void f(Metadata*)) {
1544 address low_boundary = verified_entry_point();
1545 if (is_not_entrant()) {
1546 low_boundary += NativeJump::instruction_size;
1547 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1548 // (See comment above.)
1549 }
1550 {
1551 // Visit all immediate references that are embedded in the instruction stream.
1552 RelocIterator iter(this, low_boundary);
1553 while (iter.next()) {
1554 if (iter.type() == relocInfo::metadata_type ) {
1555 metadata_Relocation* r = iter.metadata_reloc();
1556 // In this metadata, we must only follow those metadatas directly embedded in
1557 // the code. Other metadatas (oop_index>0) are seen as part of
1558 // the metadata section below.
1559 assert(1 == (r->metadata_is_immediate()) +
1560 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
1561 "metadata must be found in exactly one place");
1562 if (r->metadata_is_immediate() && r->metadata_value() != NULL) {
1563 Metadata* md = r->metadata_value();
1564 if (md != _method) f(md);
1565 }
1566 } else if (iter.type() == relocInfo::virtual_call_type) {
1567 // Check compiledIC holders associated with this nmethod
1568 CompiledIC *ic = CompiledIC_at(&iter);
1569 if (ic->is_icholder_call()) {
1570 CompiledICHolder* cichk = ic->cached_icholder();
1571 f(cichk->holder_method());
1572 f(cichk->holder_klass());
1573 } else {
1574 Metadata* ic_oop = ic->cached_metadata();
1575 if (ic_oop != NULL) {
1576 f(ic_oop);
1577 }
1578 }
1579 }
1580 }
1581 }
1582
1583 // Visit the metadata section
1584 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
1585 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops
1586 Metadata* md = *p;
1587 f(md);
1588 }
1589
1590 // Visit metadata not embedded in the other places.
1591 if (_method != NULL) f(_method);
1592 }
1593
1594 void nmethod::oops_do(OopClosure* f, bool allow_zombie) {
1595 // make sure the oops ready to receive visitors
1596 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod");
1597 assert(!is_unloaded(), "should not call follow on unloaded nmethod");
1598
1599 // If the method is not entrant or zombie then a JMP is plastered over the
1600 // first few bytes. If an oop in the old code was there, that oop
1601 // should not get GC'd. Skip the first few bytes of oops on
1602 // not-entrant methods.
1603 address low_boundary = verified_entry_point();
1604 if (is_not_entrant()) {
1605 low_boundary += NativeJump::instruction_size;
1606 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
1607 // (See comment above.)
1608 }
1609
1610 #if INCLUDE_JVMCI
1611 if (_jvmci_installed_code != NULL) {
1612 f->do_oop((oop*) &_jvmci_installed_code);
1613 }
1614 if (_speculation_log != NULL) {
1615 f->do_oop((oop*) &_speculation_log);
1616 }
1617 #endif
1618
1619 RelocIterator iter(this, low_boundary);
1620
1621 while (iter.next()) {
1622 if (iter.type() == relocInfo::oop_type ) {
1623 oop_Relocation* r = iter.oop_reloc();
1624 // In this loop, we must only follow those oops directly embedded in
1625 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1626 assert(1 == (r->oop_is_immediate()) +
1627 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1628 "oop must be found in exactly one place");
1629 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1630 f->do_oop(r->oop_addr());
1631 }
1632 }
1633 }
1634
1635 // Scopes
1636 // This includes oop constants not inlined in the code stream.
1637 for (oop* p = oops_begin(); p < oops_end(); p++) {
1638 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1639 f->do_oop(p);
1640 }
1641 }
1642
1643 #define NMETHOD_SENTINEL ((nmethod*)badAddress)
1644
1645 nmethod* volatile nmethod::_oops_do_mark_nmethods;
1646
1647 // An nmethod is "marked" if its _mark_link is set non-null.
1648 // Even if it is the end of the linked list, it will have a non-null link value,
1649 // as long as it is on the list.
1650 // This code must be MP safe, because it is used from parallel GC passes.
1651 bool nmethod::test_set_oops_do_mark() {
1652 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");
1653 nmethod* observed_mark_link = _oops_do_mark_link;
1654 if (observed_mark_link == NULL) {
1655 // Claim this nmethod for this thread to mark.
1656 observed_mark_link = (nmethod*)
1657 Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_link, NULL);
1658 if (observed_mark_link == NULL) {
1659
1660 // Atomically append this nmethod (now claimed) to the head of the list:
1661 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods;
1662 for (;;) {
1663 nmethod* required_mark_nmethods = observed_mark_nmethods;
1664 _oops_do_mark_link = required_mark_nmethods;
1665 observed_mark_nmethods = (nmethod*)
1666 Atomic::cmpxchg_ptr(this, &_oops_do_mark_nmethods, required_mark_nmethods);
1667 if (observed_mark_nmethods == required_mark_nmethods)
1668 break;
1669 }
1670 // Mark was clear when we first saw this guy.
1671 if (TraceScavenge) { print_on(tty, "oops_do, mark"); }
1672 return false;
1673 }
1674 }
1675 // On fall through, another racing thread marked this nmethod before we did.
1676 return true;
1677 }
1678
1679 void nmethod::oops_do_marking_prologue() {
1680 if (TraceScavenge) { tty->print_cr("[oops_do_marking_prologue"); }
1681 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row");
1682 // We use cmpxchg_ptr instead of regular assignment here because the user
1683 // may fork a bunch of threads, and we need them all to see the same state.
1684 void* observed = Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, NULL);
1685 guarantee(observed == NULL, "no races in this sequential code");
1686 }
1687
1688 void nmethod::oops_do_marking_epilogue() {
1689 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row");
1690 nmethod* cur = _oops_do_mark_nmethods;
1691 while (cur != NMETHOD_SENTINEL) {
1692 assert(cur != NULL, "not NULL-terminated");
1693 nmethod* next = cur->_oops_do_mark_link;
1694 cur->_oops_do_mark_link = NULL;
1695 DEBUG_ONLY(cur->verify_oop_relocations());
1696 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark"));
1697 cur = next;
1698 }
1699 void* required = _oops_do_mark_nmethods;
1700 void* observed = Atomic::cmpxchg_ptr(NULL, &_oops_do_mark_nmethods, required);
1701 guarantee(observed == required, "no races in this sequential code");
1702 if (TraceScavenge) { tty->print_cr("oops_do_marking_epilogue]"); }
1703 }
1704
1705 class DetectScavengeRoot: public OopClosure {
1706 bool _detected_scavenge_root;
1707 public:
1708 DetectScavengeRoot() : _detected_scavenge_root(false)
1709 { NOT_PRODUCT(_print_nm = NULL); }
1710 bool detected_scavenge_root() { return _detected_scavenge_root; }
1711 virtual void do_oop(oop* p) {
1712 if ((*p) != NULL && (*p)->is_scavengable()) {
1713 NOT_PRODUCT(maybe_print(p));
1714 _detected_scavenge_root = true;
1715 }
1716 }
1717 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
1718
1719 #ifndef PRODUCT
1720 nmethod* _print_nm;
1721 void maybe_print(oop* p) {
1722 if (_print_nm == NULL) return;
1723 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root");
1724 tty->print_cr("" PTR_FORMAT "[offset=%d] detected scavengable oop " PTR_FORMAT " (found at " PTR_FORMAT ")",
1725 p2i(_print_nm), (int)((intptr_t)p - (intptr_t)_print_nm),
1726 p2i(*p), p2i(p));
1727 (*p)->print();
1728 }
1729 #endif //PRODUCT
1730 };
1731
1732 bool nmethod::detect_scavenge_root_oops() {
1733 DetectScavengeRoot detect_scavenge_root;
1734 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this);
1735 oops_do(&detect_scavenge_root);
1736 return detect_scavenge_root.detected_scavenge_root();
1737 }
1738
1739 inline bool includes(void* p, void* from, void* to) {
1740 return from <= p && p < to;
1741 }
1742
1743
1744 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
1745 assert(count >= 2, "must be sentinel values, at least");
1746
1747 #ifdef ASSERT
1748 // must be sorted and unique; we do a binary search in find_pc_desc()
1749 int prev_offset = pcs[0].pc_offset();
1750 assert(prev_offset == PcDesc::lower_offset_limit,
1751 "must start with a sentinel");
1752 for (int i = 1; i < count; i++) {
1753 int this_offset = pcs[i].pc_offset();
1754 assert(this_offset > prev_offset, "offsets must be sorted");
1755 prev_offset = this_offset;
1756 }
1757 assert(prev_offset == PcDesc::upper_offset_limit,
1758 "must end with a sentinel");
1759 #endif //ASSERT
1760
1761 // Search for MethodHandle invokes and tag the nmethod.
1762 for (int i = 0; i < count; i++) {
1763 if (pcs[i].is_method_handle_invoke()) {
1764 set_has_method_handle_invokes(true);
1765 break;
1766 }
1767 }
1768 assert(has_method_handle_invokes() == (_deopt_mh_handler_begin != NULL), "must have deopt mh handler");
1769
1770 int size = count * sizeof(PcDesc);
1771 assert(scopes_pcs_size() >= size, "oob");
1772 memcpy(scopes_pcs_begin(), pcs, size);
1773
1774 // Adjust the final sentinel downward.
1775 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
1776 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
1777 last_pc->set_pc_offset(content_size() + 1);
1778 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
1779 // Fill any rounding gaps with copies of the last record.
1780 last_pc[1] = last_pc[0];
1781 }
1782 // The following assert could fail if sizeof(PcDesc) is not
1783 // an integral multiple of oopSize (the rounding term).
1784 // If it fails, change the logic to always allocate a multiple
1785 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
1786 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
1787 }
1788
1789 void nmethod::copy_scopes_data(u_char* buffer, int size) {
1790 assert(scopes_data_size() >= size, "oob");
1791 memcpy(scopes_data_begin(), buffer, size);
1792 }
1793
1794 #ifdef ASSERT
1795 static PcDesc* linear_search(const PcDescSearch& search, int pc_offset, bool approximate) {
1796 PcDesc* lower = search.scopes_pcs_begin();
1797 PcDesc* upper = search.scopes_pcs_end();
1798 lower += 1; // exclude initial sentinel
1799 PcDesc* res = NULL;
1800 for (PcDesc* p = lower; p < upper; p++) {
1801 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc
1802 if (match_desc(p, pc_offset, approximate)) {
1803 if (res == NULL)
1804 res = p;
1805 else
1806 res = (PcDesc*) badAddress;
1807 }
1808 }
1809 return res;
1810 }
1811 #endif
1812
1813
1814 // Finds a PcDesc with real-pc equal to "pc"
1815 PcDesc* PcDescContainer::find_pc_desc_internal(address pc, bool approximate, const PcDescSearch& search) {
1816 address base_address = search.code_begin();
1817 if ((pc < base_address) ||
1818 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
1819 return NULL; // PC is wildly out of range
1820 }
1821 int pc_offset = (int) (pc - base_address);
1822
1823 // Check the PcDesc cache if it contains the desired PcDesc
1824 // (This as an almost 100% hit rate.)
1825 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
1826 if (res != NULL) {
1827 assert(res == linear_search(search, pc_offset, approximate), "cache ok");
1828 return res;
1829 }
1830
1831 // Fallback algorithm: quasi-linear search for the PcDesc
1832 // Find the last pc_offset less than the given offset.
1833 // The successor must be the required match, if there is a match at all.
1834 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
1835 PcDesc* lower = search.scopes_pcs_begin();
1836 PcDesc* upper = search.scopes_pcs_end();
1837 upper -= 1; // exclude final sentinel
1838 if (lower >= upper) return NULL; // native method; no PcDescs at all
1839
1840 #define assert_LU_OK \
1841 /* invariant on lower..upper during the following search: */ \
1842 assert(lower->pc_offset() < pc_offset, "sanity"); \
1843 assert(upper->pc_offset() >= pc_offset, "sanity")
1844 assert_LU_OK;
1845
1846 // Use the last successful return as a split point.
1847 PcDesc* mid = _pc_desc_cache.last_pc_desc();
1848 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1849 if (mid->pc_offset() < pc_offset) {
1850 lower = mid;
1851 } else {
1852 upper = mid;
1853 }
1854
1855 // Take giant steps at first (4096, then 256, then 16, then 1)
1856 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
1857 const int RADIX = (1 << LOG2_RADIX);
1858 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
1859 while ((mid = lower + step) < upper) {
1860 assert_LU_OK;
1861 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1862 if (mid->pc_offset() < pc_offset) {
1863 lower = mid;
1864 } else {
1865 upper = mid;
1866 break;
1867 }
1868 }
1869 assert_LU_OK;
1870 }
1871
1872 // Sneak up on the value with a linear search of length ~16.
1873 while (true) {
1874 assert_LU_OK;
1875 mid = lower + 1;
1876 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1877 if (mid->pc_offset() < pc_offset) {
1878 lower = mid;
1879 } else {
1880 upper = mid;
1881 break;
1882 }
1883 }
1884 #undef assert_LU_OK
1885
1886 if (match_desc(upper, pc_offset, approximate)) {
1887 assert(upper == linear_search(search, pc_offset, approximate), "search ok");
1888 _pc_desc_cache.add_pc_desc(upper);
1889 return upper;
1890 } else {
1891 assert(NULL == linear_search(search, pc_offset, approximate), "search ok");
1892 return NULL;
1893 }
1894 }
1895
1896
1897 void nmethod::check_all_dependencies(DepChange& changes) {
1898 // Checked dependencies are allocated into this ResourceMark
1899 ResourceMark rm;
1900
1901 // Turn off dependency tracing while actually testing dependencies.
1902 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) );
1903
1904 typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash,
1905 &DependencySignature::equals, 11027> DepTable;
1906
1907 DepTable* table = new DepTable();
1908
1909 // Iterate over live nmethods and check dependencies of all nmethods that are not
1910 // marked for deoptimization. A particular dependency is only checked once.
1911 NMethodIterator iter;
1912 while(iter.next()) {
1913 nmethod* nm = iter.method();
1914 // Only notify for live nmethods
1915 if (nm->is_alive() && !nm->is_marked_for_deoptimization()) {
1916 for (Dependencies::DepStream deps(nm); deps.next(); ) {
1917 // Construct abstraction of a dependency.
1918 DependencySignature* current_sig = new DependencySignature(deps);
1919
1920 // Determine if dependency is already checked. table->put(...) returns
1921 // 'true' if the dependency is added (i.e., was not in the hashtable).
1922 if (table->put(*current_sig, 1)) {
1923 if (deps.check_dependency() != NULL) {
1924 // Dependency checking failed. Print out information about the failed
1925 // dependency and finally fail with an assert. We can fail here, since
1926 // dependency checking is never done in a product build.
1927 tty->print_cr("Failed dependency:");
1928 changes.print();
1929 nm->print();
1930 nm->print_dependencies();
1931 assert(false, "Should have been marked for deoptimization");
1932 }
1933 }
1934 }
1935 }
1936 }
1937 }
1938
1939 bool nmethod::check_dependency_on(DepChange& changes) {
1940 // What has happened:
1941 // 1) a new class dependee has been added
1942 // 2) dependee and all its super classes have been marked
1943 bool found_check = false; // set true if we are upset
1944 for (Dependencies::DepStream deps(this); deps.next(); ) {
1945 // Evaluate only relevant dependencies.
1946 if (deps.spot_check_dependency_at(changes) != NULL) {
1947 found_check = true;
1948 NOT_DEBUG(break);
1949 }
1950 }
1951 return found_check;
1952 }
1953
1954 bool nmethod::is_evol_dependent_on(Klass* dependee) {
1955 InstanceKlass *dependee_ik = InstanceKlass::cast(dependee);
1956 Array<Method*>* dependee_methods = dependee_ik->methods();
1957 for (Dependencies::DepStream deps(this); deps.next(); ) {
1958 if (deps.type() == Dependencies::evol_method) {
1959 Method* method = deps.method_argument(0);
1960 for (int j = 0; j < dependee_methods->length(); j++) {
1961 if (dependee_methods->at(j) == method) {
1962 if (log_is_enabled(Debug, redefine, class, nmethod)) {
1963 ResourceMark rm;
1964 log_debug(redefine, class, nmethod)
1965 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)",
1966 _method->method_holder()->external_name(),
1967 _method->name()->as_C_string(),
1968 _method->signature()->as_C_string(),
1969 compile_id(),
1970 method->method_holder()->external_name(),
1971 method->name()->as_C_string(),
1972 method->signature()->as_C_string());
1973 }
1974 if (TraceDependencies || LogCompilation)
1975 deps.log_dependency(dependee);
1976 return true;
1977 }
1978 }
1979 }
1980 }
1981 return false;
1982 }
1983
1984 // Called from mark_for_deoptimization, when dependee is invalidated.
1985 bool nmethod::is_dependent_on_method(Method* dependee) {
1986 for (Dependencies::DepStream deps(this); deps.next(); ) {
1987 if (deps.type() != Dependencies::evol_method)
1988 continue;
1989 Method* method = deps.method_argument(0);
1990 if (method == dependee) return true;
1991 }
1992 return false;
1993 }
1994
1995
1996 bool nmethod::is_patchable_at(address instr_addr) {
1997 assert(insts_contains(instr_addr), "wrong nmethod used");
1998 if (is_zombie()) {
1999 // a zombie may never be patched
2000 return false;
2001 }
2002 return true;
2003 }
2004
2005
2006 address nmethod::continuation_for_implicit_exception(address pc) {
2007 // Exception happened outside inline-cache check code => we are inside
2008 // an active nmethod => use cpc to determine a return address
2009 int exception_offset = pc - code_begin();
2010 int cont_offset = ImplicitExceptionTable(this).at( exception_offset );
2011 #ifdef ASSERT
2012 if (cont_offset == 0) {
2013 Thread* thread = Thread::current();
2014 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
2015 HandleMark hm(thread);
2016 ResourceMark rm(thread);
2017 CodeBlob* cb = CodeCache::find_blob(pc);
2018 assert(cb != NULL && cb == this, "");
2019 ttyLocker ttyl;
2020 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, p2i(pc));
2021 print();
2022 method()->print_codes();
2023 print_code();
2024 print_pcs();
2025 }
2026 #endif
2027 if (cont_offset == 0) {
2028 // Let the normal error handling report the exception
2029 return NULL;
2030 }
2031 return code_begin() + cont_offset;
2032 }
2033
2034
2035
2036 void nmethod_init() {
2037 // make sure you didn't forget to adjust the filler fields
2038 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
2039 }
2040
2041
2042 //-------------------------------------------------------------------------------------------
2043
2044
2045 // QQQ might we make this work from a frame??
2046 nmethodLocker::nmethodLocker(address pc) {
2047 CodeBlob* cb = CodeCache::find_blob(pc);
2048 guarantee(cb != NULL && cb->is_compiled(), "bad pc for a nmethod found");
2049 _nm = cb->as_compiled_method();
2050 lock_nmethod(_nm);
2051 }
2052
2053 // Only JvmtiDeferredEvent::compiled_method_unload_event()
2054 // should pass zombie_ok == true.
2055 void nmethodLocker::lock_nmethod(CompiledMethod* cm, bool zombie_ok) {
2056 if (cm == NULL) return;
2057 nmethod* nm = cm->as_nmethod();
2058 Atomic::inc(&nm->_lock_count);
2059 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method");
2060 }
2061
2062 void nmethodLocker::unlock_nmethod(CompiledMethod* cm) {
2063 if (cm == NULL) return;
2064 nmethod* nm = cm->as_nmethod();
2065 Atomic::dec(&nm->_lock_count);
2066 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock");
2067 }
2068
2069
2070 // -----------------------------------------------------------------------------
2071 // Verification
2072
2073 class VerifyOopsClosure: public OopClosure {
2074 nmethod* _nm;
2075 bool _ok;
2076 public:
2077 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
2078 bool ok() { return _ok; }
2079 virtual void do_oop(oop* p) {
2080 if ((*p) == NULL || (*p)->is_oop()) return;
2081 if (_ok) {
2082 _nm->print_nmethod(true);
2083 _ok = false;
2084 }
2085 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2086 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2087 }
2088 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2089 };
2090
2091 void nmethod::verify() {
2092
2093 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant
2094 // seems odd.
2095
2096 if (is_zombie() || is_not_entrant() || is_unloaded())
2097 return;
2098
2099 // Make sure all the entry points are correctly aligned for patching.
2100 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
2101
2102 // assert(method()->is_oop(), "must be valid");
2103
2104 ResourceMark rm;
2105
2106 if (!CodeCache::contains(this)) {
2107 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this));
2108 }
2109
2110 if(is_native_method() )
2111 return;
2112
2113 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
2114 if (nm != this) {
2115 fatal("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this));
2116 }
2117
2118 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2119 if (! p->verify(this)) {
2120 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this));
2121 }
2122 }
2123
2124 VerifyOopsClosure voc(this);
2125 oops_do(&voc);
2126 assert(voc.ok(), "embedded oops must be OK");
2127 verify_scavenge_root_oops();
2128
2129 verify_scopes();
2130 }
2131
2132
2133 void nmethod::verify_interrupt_point(address call_site) {
2134 // Verify IC only when nmethod installation is finished.
2135 bool is_installed = (method()->code() == this) // nmethod is in state 'in_use' and installed
2136 || !this->is_in_use(); // nmethod is installed, but not in 'in_use' state
2137 if (is_installed) {
2138 Thread *cur = Thread::current();
2139 if (CompiledIC_lock->owner() == cur ||
2140 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) &&
2141 SafepointSynchronize::is_at_safepoint())) {
2142 CompiledIC_at(this, call_site);
2143 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
2144 } else {
2145 MutexLocker ml_verify (CompiledIC_lock);
2146 CompiledIC_at(this, call_site);
2147 }
2148 }
2149
2150 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address());
2151 assert(pd != NULL, "PcDesc must exist");
2152 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(),
2153 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(),
2154 pd->return_oop());
2155 !sd->is_top(); sd = sd->sender()) {
2156 sd->verify();
2157 }
2158 }
2159
2160 void nmethod::verify_scopes() {
2161 if( !method() ) return; // Runtime stubs have no scope
2162 if (method()->is_native()) return; // Ignore stub methods.
2163 // iterate through all interrupt point
2164 // and verify the debug information is valid.
2165 RelocIterator iter((nmethod*)this);
2166 while (iter.next()) {
2167 address stub = NULL;
2168 switch (iter.type()) {
2169 case relocInfo::virtual_call_type:
2170 verify_interrupt_point(iter.addr());
2171 break;
2172 case relocInfo::opt_virtual_call_type:
2173 stub = iter.opt_virtual_call_reloc()->static_stub();
2174 verify_interrupt_point(iter.addr());
2175 break;
2176 case relocInfo::static_call_type:
2177 stub = iter.static_call_reloc()->static_stub();
2178 //verify_interrupt_point(iter.addr());
2179 break;
2180 case relocInfo::runtime_call_type:
2181 case relocInfo::runtime_call_w_cp_type:
2182 address destination = iter.reloc()->value();
2183 // Right now there is no way to find out which entries support
2184 // an interrupt point. It would be nice if we had this
2185 // information in a table.
2186 break;
2187 }
2188 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section");
2189 }
2190 }
2191
2192
2193 // -----------------------------------------------------------------------------
2194 // Non-product code
2195 #ifndef PRODUCT
2196
2197 class DebugScavengeRoot: public OopClosure {
2198 nmethod* _nm;
2199 bool _ok;
2200 public:
2201 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { }
2202 bool ok() { return _ok; }
2203 virtual void do_oop(oop* p) {
2204 if ((*p) == NULL || !(*p)->is_scavengable()) return;
2205 if (_ok) {
2206 _nm->print_nmethod(true);
2207 _ok = false;
2208 }
2209 tty->print_cr("*** scavengable oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2210 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2211 (*p)->print();
2212 }
2213 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2214 };
2215
2216 void nmethod::verify_scavenge_root_oops() {
2217 if (UseG1GC) {
2218 return;
2219 }
2220
2221 if (!on_scavenge_root_list()) {
2222 // Actually look inside, to verify the claim that it's clean.
2223 DebugScavengeRoot debug_scavenge_root(this);
2224 oops_do(&debug_scavenge_root);
2225 if (!debug_scavenge_root.ok())
2226 fatal("found an unadvertised bad scavengable oop in the code cache");
2227 }
2228 assert(scavenge_root_not_marked(), "");
2229 }
2230
2231 #endif // PRODUCT
2232
2233 // Printing operations
2234
2235 void nmethod::print() const {
2236 ResourceMark rm;
2237 ttyLocker ttyl; // keep the following output all in one block
2238
2239 tty->print("Compiled method ");
2240
2241 if (is_compiled_by_c1()) {
2242 tty->print("(c1) ");
2243 } else if (is_compiled_by_c2()) {
2244 tty->print("(c2) ");
2245 } else if (is_compiled_by_shark()) {
2246 tty->print("(shark) ");
2247 } else if (is_compiled_by_jvmci()) {
2248 tty->print("(JVMCI) ");
2249 } else {
2250 tty->print("(nm) ");
2251 }
2252
2253 print_on(tty, NULL);
2254
2255 if (WizardMode) {
2256 tty->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this));
2257 tty->print(" for method " INTPTR_FORMAT , p2i(method()));
2258 tty->print(" { ");
2259 tty->print_cr("%s ", state());
2260 if (on_scavenge_root_list()) tty->print("scavenge_root ");
2261 tty->print_cr("}:");
2262 }
2263 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2264 p2i(this),
2265 p2i(this) + size(),
2266 size());
2267 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2268 p2i(relocation_begin()),
2269 p2i(relocation_end()),
2270 relocation_size());
2271 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2272 p2i(consts_begin()),
2273 p2i(consts_end()),
2274 consts_size());
2275 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2276 p2i(insts_begin()),
2277 p2i(insts_end()),
2278 insts_size());
2279 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2280 p2i(stub_begin()),
2281 p2i(stub_end()),
2282 stub_size());
2283 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2284 p2i(oops_begin()),
2285 p2i(oops_end()),
2286 oops_size());
2287 if (metadata_size () > 0) tty->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2288 p2i(metadata_begin()),
2289 p2i(metadata_end()),
2290 metadata_size());
2291 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2292 p2i(scopes_data_begin()),
2293 p2i(scopes_data_end()),
2294 scopes_data_size());
2295 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2296 p2i(scopes_pcs_begin()),
2297 p2i(scopes_pcs_end()),
2298 scopes_pcs_size());
2299 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2300 p2i(dependencies_begin()),
2301 p2i(dependencies_end()),
2302 dependencies_size());
2303 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2304 p2i(handler_table_begin()),
2305 p2i(handler_table_end()),
2306 handler_table_size());
2307 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2308 p2i(nul_chk_table_begin()),
2309 p2i(nul_chk_table_end()),
2310 nul_chk_table_size());
2311 }
2312
2313 #ifndef PRODUCT
2314
2315 void nmethod::print_scopes() {
2316 // Find the first pc desc for all scopes in the code and print it.
2317 ResourceMark rm;
2318 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2319 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
2320 continue;
2321
2322 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
2323 while (sd != NULL) {
2324 sd->print_on(tty, p);
2325 sd = sd->sender();
2326 }
2327 }
2328 }
2329
2330 void nmethod::print_dependencies() {
2331 ResourceMark rm;
2332 ttyLocker ttyl; // keep the following output all in one block
2333 tty->print_cr("Dependencies:");
2334 for (Dependencies::DepStream deps(this); deps.next(); ) {
2335 deps.print_dependency();
2336 Klass* ctxk = deps.context_type();
2337 if (ctxk != NULL) {
2338 if (ctxk->is_instance_klass() && InstanceKlass::cast(ctxk)->is_dependent_nmethod(this)) {
2339 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name());
2340 }
2341 }
2342 deps.log_dependency(); // put it into the xml log also
2343 }
2344 }
2345
2346
2347 void nmethod::print_relocations() {
2348 ResourceMark m; // in case methods get printed via the debugger
2349 tty->print_cr("relocations:");
2350 RelocIterator iter(this);
2351 iter.print();
2352 if (UseRelocIndex) {
2353 jint* index_end = (jint*)relocation_end() - 1;
2354 jint index_size = *index_end;
2355 jint* index_start = (jint*)( (address)index_end - index_size );
2356 tty->print_cr(" index @" INTPTR_FORMAT ": index_size=%d", p2i(index_start), index_size);
2357 if (index_size > 0) {
2358 jint* ip;
2359 for (ip = index_start; ip+2 <= index_end; ip += 2)
2360 tty->print_cr(" (%d %d) addr=" INTPTR_FORMAT " @" INTPTR_FORMAT,
2361 ip[0],
2362 ip[1],
2363 p2i(header_end()+ip[0]),
2364 p2i(relocation_begin()-1+ip[1]));
2365 for (; ip < index_end; ip++)
2366 tty->print_cr(" (%d ?)", ip[0]);
2367 tty->print_cr(" @" INTPTR_FORMAT ": index_size=%d", p2i(ip), *ip);
2368 ip++;
2369 tty->print_cr("reloc_end @" INTPTR_FORMAT ":", p2i(ip));
2370 }
2371 }
2372 }
2373
2374
2375 void nmethod::print_pcs() {
2376 ResourceMark m; // in case methods get printed via debugger
2377 tty->print_cr("pc-bytecode offsets:");
2378 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2379 p->print(this);
2380 }
2381 }
2382
2383 void nmethod::print_recorded_oops() {
2384 tty->print_cr("Recorded oops:");
2385 for (int i = 0; i < oops_count(); i++) {
2386 oop o = oop_at(i);
2387 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(o));
2388 if (o == (oop)Universe::non_oop_word()) {
2389 tty->print("non-oop word");
2390 } else {
2391 o->print_value();
2392 }
2393 tty->cr();
2394 }
2395 }
2396
2397 void nmethod::print_recorded_metadata() {
2398 tty->print_cr("Recorded metadata:");
2399 for (int i = 0; i < metadata_count(); i++) {
2400 Metadata* m = metadata_at(i);
2401 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(m));
2402 if (m == (Metadata*)Universe::non_oop_word()) {
2403 tty->print("non-metadata word");
2404 } else {
2405 m->print_value_on_maybe_null(tty);
2406 }
2407 tty->cr();
2408 }
2409 }
2410
2411 #endif // PRODUCT
2412
2413 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
2414 RelocIterator iter(this, begin, end);
2415 bool have_one = false;
2416 while (iter.next()) {
2417 have_one = true;
2418 switch (iter.type()) {
2419 case relocInfo::none: return "no_reloc";
2420 case relocInfo::oop_type: {
2421 stringStream st;
2422 oop_Relocation* r = iter.oop_reloc();
2423 oop obj = r->oop_value();
2424 st.print("oop(");
2425 if (obj == NULL) st.print("NULL");
2426 else obj->print_value_on(&st);
2427 st.print(")");
2428 return st.as_string();
2429 }
2430 case relocInfo::metadata_type: {
2431 stringStream st;
2432 metadata_Relocation* r = iter.metadata_reloc();
2433 Metadata* obj = r->metadata_value();
2434 st.print("metadata(");
2435 if (obj == NULL) st.print("NULL");
2436 else obj->print_value_on(&st);
2437 st.print(")");
2438 return st.as_string();
2439 }
2440 case relocInfo::runtime_call_type:
2441 case relocInfo::runtime_call_w_cp_type: {
2442 stringStream st;
2443 st.print("runtime_call");
2444 CallRelocation* r = (CallRelocation*)iter.reloc();
2445 address dest = r->destination();
2446 CodeBlob* cb = CodeCache::find_blob(dest);
2447 if (cb != NULL) {
2448 st.print(" %s", cb->name());
2449 } else {
2450 ResourceMark rm;
2451 const int buflen = 1024;
2452 char* buf = NEW_RESOURCE_ARRAY(char, buflen);
2453 int offset;
2454 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) {
2455 st.print(" %s", buf);
2456 if (offset != 0) {
2457 st.print("+%d", offset);
2458 }
2459 }
2460 }
2461 return st.as_string();
2462 }
2463 case relocInfo::virtual_call_type: {
2464 stringStream st;
2465 st.print_raw("virtual_call");
2466 virtual_call_Relocation* r = iter.virtual_call_reloc();
2467 Method* m = r->method_value();
2468 if (m != NULL) {
2469 assert(m->is_method(), "");
2470 m->print_short_name(&st);
2471 }
2472 return st.as_string();
2473 }
2474 case relocInfo::opt_virtual_call_type: {
2475 stringStream st;
2476 st.print_raw("optimized virtual_call");
2477 opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc();
2478 Method* m = r->method_value();
2479 if (m != NULL) {
2480 assert(m->is_method(), "");
2481 m->print_short_name(&st);
2482 }
2483 return st.as_string();
2484 }
2485 case relocInfo::static_call_type: {
2486 stringStream st;
2487 st.print_raw("static_call");
2488 static_call_Relocation* r = iter.static_call_reloc();
2489 Method* m = r->method_value();
2490 if (m != NULL) {
2491 assert(m->is_method(), "");
2492 m->print_short_name(&st);
2493 }
2494 return st.as_string();
2495 }
2496 case relocInfo::static_stub_type: return "static_stub";
2497 case relocInfo::external_word_type: return "external_word";
2498 case relocInfo::internal_word_type: return "internal_word";
2499 case relocInfo::section_word_type: return "section_word";
2500 case relocInfo::poll_type: return "poll";
2501 case relocInfo::poll_return_type: return "poll_return";
2502 case relocInfo::type_mask: return "type_bit_mask";
2503 }
2504 }
2505 return have_one ? "other" : NULL;
2506 }
2507
2508 // Return a the last scope in (begin..end]
2509 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
2510 PcDesc* p = pc_desc_near(begin+1);
2511 if (p != NULL && p->real_pc(this) <= end) {
2512 return new ScopeDesc(this, p->scope_decode_offset(),
2513 p->obj_decode_offset(), p->should_reexecute(), p->rethrow_exception(),
2514 p->return_oop());
2515 }
2516 return NULL;
2517 }
2518
2519 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const {
2520 if (block_begin == entry_point()) stream->print_cr("[Entry Point]");
2521 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]");
2522 if (JVMCI_ONLY(_exception_offset >= 0 &&) block_begin == exception_begin()) stream->print_cr("[Exception Handler]");
2523 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]");
2524 if (JVMCI_ONLY(_deopt_handler_begin != NULL &&) block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]");
2525
2526 if (has_method_handle_invokes())
2527 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]");
2528
2529 if (block_begin == consts_begin()) stream->print_cr("[Constants]");
2530
2531 if (block_begin == entry_point()) {
2532 methodHandle m = method();
2533 if (m.not_null()) {
2534 stream->print(" # ");
2535 m->print_value_on(stream);
2536 stream->cr();
2537 }
2538 if (m.not_null() && !is_osr_method()) {
2539 ResourceMark rm;
2540 int sizeargs = m->size_of_parameters();
2541 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
2542 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
2543 {
2544 int sig_index = 0;
2545 if (!m->is_static())
2546 sig_bt[sig_index++] = T_OBJECT; // 'this'
2547 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) {
2548 BasicType t = ss.type();
2549 sig_bt[sig_index++] = t;
2550 if (type2size[t] == 2) {
2551 sig_bt[sig_index++] = T_VOID;
2552 } else {
2553 assert(type2size[t] == 1, "size is 1 or 2");
2554 }
2555 }
2556 assert(sig_index == sizeargs, "");
2557 }
2558 const char* spname = "sp"; // make arch-specific?
2559 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false);
2560 int stack_slot_offset = this->frame_size() * wordSize;
2561 int tab1 = 14, tab2 = 24;
2562 int sig_index = 0;
2563 int arg_index = (m->is_static() ? 0 : -1);
2564 bool did_old_sp = false;
2565 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) {
2566 bool at_this = (arg_index == -1);
2567 bool at_old_sp = false;
2568 BasicType t = (at_this ? T_OBJECT : ss.type());
2569 assert(t == sig_bt[sig_index], "sigs in sync");
2570 if (at_this)
2571 stream->print(" # this: ");
2572 else
2573 stream->print(" # parm%d: ", arg_index);
2574 stream->move_to(tab1);
2575 VMReg fst = regs[sig_index].first();
2576 VMReg snd = regs[sig_index].second();
2577 if (fst->is_reg()) {
2578 stream->print("%s", fst->name());
2579 if (snd->is_valid()) {
2580 stream->print(":%s", snd->name());
2581 }
2582 } else if (fst->is_stack()) {
2583 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
2584 if (offset == stack_slot_offset) at_old_sp = true;
2585 stream->print("[%s+0x%x]", spname, offset);
2586 } else {
2587 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
2588 }
2589 stream->print(" ");
2590 stream->move_to(tab2);
2591 stream->print("= ");
2592 if (at_this) {
2593 m->method_holder()->print_value_on(stream);
2594 } else {
2595 bool did_name = false;
2596 if (!at_this && ss.is_object()) {
2597 Symbol* name = ss.as_symbol_or_null();
2598 if (name != NULL) {
2599 name->print_value_on(stream);
2600 did_name = true;
2601 }
2602 }
2603 if (!did_name)
2604 stream->print("%s", type2name(t));
2605 }
2606 if (at_old_sp) {
2607 stream->print(" (%s of caller)", spname);
2608 did_old_sp = true;
2609 }
2610 stream->cr();
2611 sig_index += type2size[t];
2612 arg_index += 1;
2613 if (!at_this) ss.next();
2614 }
2615 if (!did_old_sp) {
2616 stream->print(" # ");
2617 stream->move_to(tab1);
2618 stream->print("[%s+0x%x]", spname, stack_slot_offset);
2619 stream->print(" (%s of caller)", spname);
2620 stream->cr();
2621 }
2622 }
2623 }
2624 }
2625
2626 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) {
2627 // First, find an oopmap in (begin, end].
2628 // We use the odd half-closed interval so that oop maps and scope descs
2629 // which are tied to the byte after a call are printed with the call itself.
2630 address base = code_begin();
2631 ImmutableOopMapSet* oms = oop_maps();
2632 if (oms != NULL) {
2633 for (int i = 0, imax = oms->count(); i < imax; i++) {
2634 const ImmutableOopMapPair* pair = oms->pair_at(i);
2635 const ImmutableOopMap* om = pair->get_from(oms);
2636 address pc = base + pair->pc_offset();
2637 if (pc > begin) {
2638 if (pc <= end) {
2639 st->move_to(column);
2640 st->print("; ");
2641 om->print_on(st);
2642 }
2643 break;
2644 }
2645 }
2646 }
2647
2648 // Print any debug info present at this pc.
2649 ScopeDesc* sd = scope_desc_in(begin, end);
2650 if (sd != NULL) {
2651 st->move_to(column);
2652 if (sd->bci() == SynchronizationEntryBCI) {
2653 st->print(";*synchronization entry");
2654 } else {
2655 if (sd->method() == NULL) {
2656 st->print("method is NULL");
2657 } else if (sd->method()->is_native()) {
2658 st->print("method is native");
2659 } else {
2660 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci());
2661 st->print(";*%s", Bytecodes::name(bc));
2662 switch (bc) {
2663 case Bytecodes::_invokevirtual:
2664 case Bytecodes::_invokespecial:
2665 case Bytecodes::_invokestatic:
2666 case Bytecodes::_invokeinterface:
2667 {
2668 Bytecode_invoke invoke(sd->method(), sd->bci());
2669 st->print(" ");
2670 if (invoke.name() != NULL)
2671 invoke.name()->print_symbol_on(st);
2672 else
2673 st->print("<UNKNOWN>");
2674 break;
2675 }
2676 case Bytecodes::_getfield:
2677 case Bytecodes::_putfield:
2678 case Bytecodes::_getstatic:
2679 case Bytecodes::_putstatic:
2680 {
2681 Bytecode_field field(sd->method(), sd->bci());
2682 st->print(" ");
2683 if (field.name() != NULL)
2684 field.name()->print_symbol_on(st);
2685 else
2686 st->print("<UNKNOWN>");
2687 }
2688 }
2689 }
2690 st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop());
2691 }
2692
2693 // Print all scopes
2694 for (;sd != NULL; sd = sd->sender()) {
2695 st->move_to(column);
2696 st->print("; -");
2697 if (sd->method() == NULL) {
2698 st->print("method is NULL");
2699 } else {
2700 sd->method()->print_short_name(st);
2701 }
2702 int lineno = sd->method()->line_number_from_bci(sd->bci());
2703 if (lineno != -1) {
2704 st->print("@%d (line %d)", sd->bci(), lineno);
2705 } else {
2706 st->print("@%d", sd->bci());
2707 }
2708 st->cr();
2709 }
2710 }
2711
2712 // Print relocation information
2713 const char* str = reloc_string_for(begin, end);
2714 if (str != NULL) {
2715 if (sd != NULL) st->cr();
2716 st->move_to(column);
2717 st->print("; {%s}", str);
2718 }
2719 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin());
2720 if (cont_offset != 0) {
2721 st->move_to(column);
2722 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset));
2723 }
2724
2725 }
2726
2727 #ifndef PRODUCT
2728
2729 void nmethod::print_value_on(outputStream* st) const {
2730 st->print("nmethod");
2731 print_on(st, NULL);
2732 }
2733
2734 void nmethod::print_calls(outputStream* st) {
2735 RelocIterator iter(this);
2736 while (iter.next()) {
2737 switch (iter.type()) {
2738 case relocInfo::virtual_call_type:
2739 case relocInfo::opt_virtual_call_type: {
2740 VerifyMutexLocker mc(CompiledIC_lock);
2741 CompiledIC_at(&iter)->print();
2742 break;
2743 }
2744 case relocInfo::static_call_type:
2745 st->print_cr("Static call at " INTPTR_FORMAT, p2i(iter.reloc()->addr()));
2746 compiledStaticCall_at(iter.reloc())->print();
2747 break;
2748 }
2749 }
2750 }
2751
2752 void nmethod::print_handler_table() {
2753 ExceptionHandlerTable(this).print();
2754 }
2755
2756 void nmethod::print_nul_chk_table() {
2757 ImplicitExceptionTable(this).print(code_begin());
2758 }
2759
2760 void nmethod::print_statistics() {
2761 ttyLocker ttyl;
2762 if (xtty != NULL) xtty->head("statistics type='nmethod'");
2763 native_nmethod_stats.print_native_nmethod_stats();
2764 #ifdef COMPILER1
2765 c1_java_nmethod_stats.print_nmethod_stats("C1");
2766 #endif
2767 #ifdef COMPILER2
2768 c2_java_nmethod_stats.print_nmethod_stats("C2");
2769 #endif
2770 #if INCLUDE_JVMCI
2771 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI");
2772 #endif
2773 #ifdef SHARK
2774 shark_java_nmethod_stats.print_nmethod_stats("Shark");
2775 #endif
2776 unknown_java_nmethod_stats.print_nmethod_stats("Unknown");
2777 DebugInformationRecorder::print_statistics();
2778 #ifndef PRODUCT
2779 pc_nmethod_stats.print_pc_stats();
2780 #endif
2781 Dependencies::print_statistics();
2782 if (xtty != NULL) xtty->tail("statistics");
2783 }
2784
2785 #endif // !PRODUCT
2786
2787 #if INCLUDE_JVMCI
2788 void nmethod::clear_jvmci_installed_code() {
2789 // write_ref_method_pre/post can only be safely called at a
2790 // safepoint or while holding the CodeCache_lock
2791 assert(CodeCache_lock->is_locked() ||
2792 SafepointSynchronize::is_at_safepoint(), "should be performed under a lock for consistency");
2793 if (_jvmci_installed_code != NULL) {
2794 // This must be done carefully to maintain nmethod remembered sets properly
2795 BarrierSet* bs = GC::gc()->heap()->barrier_set();
2796 bs->write_ref_nmethod_pre(&_jvmci_installed_code, this);
2797 _jvmci_installed_code = NULL;
2798 bs->write_ref_nmethod_post(&_jvmci_installed_code, this);
2799 }
2800 }
2801
2802 void nmethod::maybe_invalidate_installed_code() {
2803 assert(Patching_lock->is_locked() ||
2804 SafepointSynchronize::is_at_safepoint(), "should be performed under a lock for consistency");
2805 oop installed_code = jvmci_installed_code();
2806 if (installed_code != NULL) {
2807 nmethod* nm = (nmethod*)InstalledCode::address(installed_code);
2808 if (nm == NULL || nm != this) {
2809 // The link has been broken or the InstalledCode instance is
2810 // associated with another nmethod so do nothing.
2811 return;
2812 }
2813 if (!is_alive()) {
2814 // Break the link between nmethod and InstalledCode such that the nmethod
2815 // can subsequently be flushed safely. The link must be maintained while
2816 // the method could have live activations since invalidateInstalledCode
2817 // might want to invalidate all existing activations.
2818 InstalledCode::set_address(installed_code, 0);
2819 InstalledCode::set_entryPoint(installed_code, 0);
2820 } else if (is_not_entrant()) {
2821 // Remove the entry point so any invocation will fail but keep
2822 // the address link around that so that existing activations can
2823 // be invalidated.
2824 InstalledCode::set_entryPoint(installed_code, 0);
2825 }
2826 }
2827 }
2828
2829 void nmethod::invalidate_installed_code(Handle installedCode, TRAPS) {
2830 if (installedCode() == NULL) {
2831 THROW(vmSymbols::java_lang_NullPointerException());
2832 }
2833 jlong nativeMethod = InstalledCode::address(installedCode);
2834 nmethod* nm = (nmethod*)nativeMethod;
2835 if (nm == NULL) {
2836 // Nothing to do
2837 return;
2838 }
2839
2840 nmethodLocker nml(nm);
2841 #ifdef ASSERT
2842 {
2843 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
2844 // This relationship can only be checked safely under a lock
2845 assert(nm == NULL || !nm->is_alive() || nm->jvmci_installed_code() == installedCode(), "sanity check");
2846 }
2847 #endif
2848
2849 if (nm->is_alive()) {
2850 // The nmethod state machinery maintains the link between the
2851 // HotSpotInstalledCode and nmethod* so as long as the nmethod appears to be
2852 // alive assume there is work to do and deoptimize the nmethod.
2853 nm->mark_for_deoptimization();
2854 VM_Deoptimize op;
2855 VMThread::execute(&op);
2856 }
2857
2858 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
2859 // Check that it's still associated with the same nmethod and break
2860 // the link if it is.
2861 if (InstalledCode::address(installedCode) == nativeMethod) {
2862 InstalledCode::set_address(installedCode, 0);
2863 }
2864 }
2865
2866 char* nmethod::jvmci_installed_code_name(char* buf, size_t buflen) {
2867 if (!this->is_compiled_by_jvmci()) {
2868 return NULL;
2869 }
2870 oop installedCode = this->jvmci_installed_code();
2871 if (installedCode != NULL) {
2872 oop installedCodeName = NULL;
2873 if (installedCode->is_a(InstalledCode::klass())) {
2874 installedCodeName = InstalledCode::name(installedCode);
2875 }
2876 if (installedCodeName != NULL) {
2877 return java_lang_String::as_utf8_string(installedCodeName, buf, (int)buflen);
2878 } else {
2879 jio_snprintf(buf, buflen, "null");
2880 return buf;
2881 }
2882 }
2883 jio_snprintf(buf, buflen, "noInstalledCode");
2884 return buf;
2885 }
2886 #endif
2887