1 /*
2 * Copyright (c) 1997, 2019, 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 "jvm.h"
27 #include "code/codeCache.hpp"
28 #include "code/compiledIC.hpp"
29 #include "code/compiledMethod.inline.hpp"
30 #include "code/dependencies.hpp"
31 #include "code/nativeInst.hpp"
32 #include "code/nmethod.hpp"
33 #include "code/scopeDesc.hpp"
34 #include "compiler/abstractCompiler.hpp"
35 #include "compiler/compileBroker.hpp"
36 #include "compiler/compileLog.hpp"
37 #include "compiler/compilerDirectives.hpp"
38 #include "compiler/directivesParser.hpp"
39 #include "compiler/disassembler.hpp"
40 #include "interpreter/bytecode.hpp"
41 #include "logging/log.hpp"
42 #include "logging/logStream.hpp"
43 #include "memory/allocation.inline.hpp"
44 #include "memory/resourceArea.hpp"
45 #include "memory/universe.hpp"
46 #include "oops/access.inline.hpp"
47 #include "oops/method.inline.hpp"
48 #include "oops/methodData.hpp"
49 #include "oops/oop.inline.hpp"
50 #include "prims/jvmtiImpl.hpp"
51 #include "runtime/atomic.hpp"
52 #include "runtime/deoptimization.hpp"
53 #include "runtime/flags/flagSetting.hpp"
54 #include "runtime/frame.inline.hpp"
55 #include "runtime/handles.inline.hpp"
56 #include "runtime/jniHandles.inline.hpp"
57 #include "runtime/orderAccess.hpp"
58 #include "runtime/os.hpp"
59 #include "runtime/safepointVerifiers.hpp"
60 #include "runtime/sharedRuntime.hpp"
61 #include "runtime/sweeper.hpp"
62 #include "runtime/vmThread.hpp"
63 #include "utilities/align.hpp"
64 #include "utilities/dtrace.hpp"
65 #include "utilities/events.hpp"
66 #include "utilities/resourceHash.hpp"
67 #include "utilities/xmlstream.hpp"
68 #if INCLUDE_JVMCI
69 #include "jvmci/jvmciRuntime.hpp"
70 #endif
71
72 #ifdef DTRACE_ENABLED
73
74 // Only bother with this argument setup if dtrace is available
75
76 #define DTRACE_METHOD_UNLOAD_PROBE(method) \
77 { \
78 Method* m = (method); \
79 if (m != NULL) { \
80 Symbol* klass_name = m->klass_name(); \
81 Symbol* name = m->name(); \
82 Symbol* signature = m->signature(); \
83 HOTSPOT_COMPILED_METHOD_UNLOAD( \
84 (char *) klass_name->bytes(), klass_name->utf8_length(), \
85 (char *) name->bytes(), name->utf8_length(), \
86 (char *) signature->bytes(), signature->utf8_length()); \
87 } \
88 }
89
90 #else // ndef DTRACE_ENABLED
91
92 #define DTRACE_METHOD_UNLOAD_PROBE(method)
93
94 #endif
95
96 //---------------------------------------------------------------------------------
97 // NMethod statistics
98 // They are printed under various flags, including:
99 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation.
100 // (In the latter two cases, they like other stats are printed to the log only.)
101
102 #ifndef PRODUCT
103 // These variables are put into one block to reduce relocations
104 // and make it simpler to print from the debugger.
105 struct java_nmethod_stats_struct {
106 int nmethod_count;
107 int total_size;
108 int relocation_size;
109 int consts_size;
110 int insts_size;
111 int stub_size;
112 int scopes_data_size;
113 int scopes_pcs_size;
114 int dependencies_size;
115 int handler_table_size;
116 int nul_chk_table_size;
117 #if INCLUDE_JVMCI
118 int speculations_size;
119 int jvmci_data_size;
120 #endif
121 int oops_size;
122 int metadata_size;
123
124 void note_nmethod(nmethod* nm) {
125 nmethod_count += 1;
126 total_size += nm->size();
127 relocation_size += nm->relocation_size();
128 consts_size += nm->consts_size();
129 insts_size += nm->insts_size();
130 stub_size += nm->stub_size();
131 oops_size += nm->oops_size();
132 metadata_size += nm->metadata_size();
133 scopes_data_size += nm->scopes_data_size();
134 scopes_pcs_size += nm->scopes_pcs_size();
135 dependencies_size += nm->dependencies_size();
136 handler_table_size += nm->handler_table_size();
137 nul_chk_table_size += nm->nul_chk_table_size();
138 #if INCLUDE_JVMCI
139 speculations_size += nm->speculations_size();
140 jvmci_data_size += nm->jvmci_data_size();
141 #endif
142 }
143 void print_nmethod_stats(const char* name) {
144 if (nmethod_count == 0) return;
145 tty->print_cr("Statistics for %d bytecoded nmethods for %s:", nmethod_count, name);
146 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size);
147 if (nmethod_count != 0) tty->print_cr(" header = " SIZE_FORMAT, nmethod_count * sizeof(nmethod));
148 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size);
149 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size);
150 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size);
151 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size);
152 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size);
153 if (metadata_size != 0) tty->print_cr(" metadata = %d", metadata_size);
154 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size);
155 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size);
156 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size);
157 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size);
158 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size);
159 #if INCLUDE_JVMCI
160 if (speculations_size != 0) tty->print_cr(" speculations = %d", speculations_size);
161 if (jvmci_data_size != 0) tty->print_cr(" JVMCI data = %d", jvmci_data_size);
162 #endif
163 }
164 };
165
166 struct native_nmethod_stats_struct {
167 int native_nmethod_count;
168 int native_total_size;
169 int native_relocation_size;
170 int native_insts_size;
171 int native_oops_size;
172 int native_metadata_size;
173 void note_native_nmethod(nmethod* nm) {
174 native_nmethod_count += 1;
175 native_total_size += nm->size();
176 native_relocation_size += nm->relocation_size();
177 native_insts_size += nm->insts_size();
178 native_oops_size += nm->oops_size();
179 native_metadata_size += nm->metadata_size();
180 }
181 void print_native_nmethod_stats() {
182 if (native_nmethod_count == 0) return;
183 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count);
184 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size);
185 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size);
186 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size);
187 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size);
188 if (native_metadata_size != 0) tty->print_cr(" N. metadata = %d", native_metadata_size);
189 }
190 };
191
192 struct pc_nmethod_stats_struct {
193 int pc_desc_resets; // number of resets (= number of caches)
194 int pc_desc_queries; // queries to nmethod::find_pc_desc
195 int pc_desc_approx; // number of those which have approximate true
196 int pc_desc_repeats; // number of _pc_descs[0] hits
197 int pc_desc_hits; // number of LRU cache hits
198 int pc_desc_tests; // total number of PcDesc examinations
199 int pc_desc_searches; // total number of quasi-binary search steps
200 int pc_desc_adds; // number of LUR cache insertions
201
202 void print_pc_stats() {
203 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query",
204 pc_desc_queries,
205 (double)(pc_desc_tests + pc_desc_searches)
206 / pc_desc_queries);
207 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d",
208 pc_desc_resets,
209 pc_desc_queries, pc_desc_approx,
210 pc_desc_repeats, pc_desc_hits,
211 pc_desc_tests, pc_desc_searches, pc_desc_adds);
212 }
213 };
214
215 #ifdef COMPILER1
216 static java_nmethod_stats_struct c1_java_nmethod_stats;
217 #endif
218 #ifdef COMPILER2
219 static java_nmethod_stats_struct c2_java_nmethod_stats;
220 #endif
221 #if INCLUDE_JVMCI
222 static java_nmethod_stats_struct jvmci_java_nmethod_stats;
223 #endif
224 static java_nmethod_stats_struct unknown_java_nmethod_stats;
225
226 static native_nmethod_stats_struct native_nmethod_stats;
227 static pc_nmethod_stats_struct pc_nmethod_stats;
228
229 static void note_java_nmethod(nmethod* nm) {
230 #ifdef COMPILER1
231 if (nm->is_compiled_by_c1()) {
232 c1_java_nmethod_stats.note_nmethod(nm);
233 } else
234 #endif
235 #ifdef COMPILER2
236 if (nm->is_compiled_by_c2()) {
237 c2_java_nmethod_stats.note_nmethod(nm);
238 } else
239 #endif
240 #if INCLUDE_JVMCI
241 if (nm->is_compiled_by_jvmci()) {
242 jvmci_java_nmethod_stats.note_nmethod(nm);
243 } else
244 #endif
245 {
246 unknown_java_nmethod_stats.note_nmethod(nm);
247 }
248 }
249 #endif // !PRODUCT
250
251 //---------------------------------------------------------------------------------
252
253
254 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) {
255 assert(pc != NULL, "Must be non null");
256 assert(exception.not_null(), "Must be non null");
257 assert(handler != NULL, "Must be non null");
258
259 _count = 0;
260 _exception_type = exception->klass();
261 _next = NULL;
262 _purge_list_next = NULL;
263
264 add_address_and_handler(pc,handler);
265 }
266
267
268 address ExceptionCache::match(Handle exception, address pc) {
269 assert(pc != NULL,"Must be non null");
270 assert(exception.not_null(),"Must be non null");
271 if (exception->klass() == exception_type()) {
272 return (test_address(pc));
273 }
274
275 return NULL;
276 }
277
278
279 bool ExceptionCache::match_exception_with_space(Handle exception) {
280 assert(exception.not_null(),"Must be non null");
281 if (exception->klass() == exception_type() && count() < cache_size) {
282 return true;
283 }
284 return false;
285 }
286
287
288 address ExceptionCache::test_address(address addr) {
289 int limit = count();
290 for (int i = 0; i < limit; i++) {
291 if (pc_at(i) == addr) {
292 return handler_at(i);
293 }
294 }
295 return NULL;
296 }
297
298
299 bool ExceptionCache::add_address_and_handler(address addr, address handler) {
300 if (test_address(addr) == handler) return true;
301
302 int index = count();
303 if (index < cache_size) {
304 set_pc_at(index, addr);
305 set_handler_at(index, handler);
306 increment_count();
307 return true;
308 }
309 return false;
310 }
311
312 ExceptionCache* ExceptionCache::next() {
313 return Atomic::load(&_next);
314 }
315
316 void ExceptionCache::set_next(ExceptionCache *ec) {
317 Atomic::store(ec, &_next);
318 }
319
320 //-----------------------------------------------------------------------------
321
322
323 // Helper used by both find_pc_desc methods.
324 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) {
325 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_tests);
326 if (!approximate)
327 return pc->pc_offset() == pc_offset;
328 else
329 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset();
330 }
331
332 void PcDescCache::reset_to(PcDesc* initial_pc_desc) {
333 if (initial_pc_desc == NULL) {
334 _pc_descs[0] = NULL; // native method; no PcDescs at all
335 return;
336 }
337 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_resets);
338 // reset the cache by filling it with benign (non-null) values
339 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel");
340 for (int i = 0; i < cache_size; i++)
341 _pc_descs[i] = initial_pc_desc;
342 }
343
344 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) {
345 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_queries);
346 NOT_PRODUCT(if (approximate) ++pc_nmethod_stats.pc_desc_approx);
347
348 // Note: one might think that caching the most recently
349 // read value separately would be a win, but one would be
350 // wrong. When many threads are updating it, the cache
351 // line it's in would bounce between caches, negating
352 // any benefit.
353
354 // In order to prevent race conditions do not load cache elements
355 // repeatedly, but use a local copy:
356 PcDesc* res;
357
358 // Step one: Check the most recently added value.
359 res = _pc_descs[0];
360 if (res == NULL) return NULL; // native method; no PcDescs at all
361 if (match_desc(res, pc_offset, approximate)) {
362 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_repeats);
363 return res;
364 }
365
366 // Step two: Check the rest of the LRU cache.
367 for (int i = 1; i < cache_size; ++i) {
368 res = _pc_descs[i];
369 if (res->pc_offset() < 0) break; // optimization: skip empty cache
370 if (match_desc(res, pc_offset, approximate)) {
371 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_hits);
372 return res;
373 }
374 }
375
376 // Report failure.
377 return NULL;
378 }
379
380 void PcDescCache::add_pc_desc(PcDesc* pc_desc) {
381 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_adds);
382 // Update the LRU cache by shifting pc_desc forward.
383 for (int i = 0; i < cache_size; i++) {
384 PcDesc* next = _pc_descs[i];
385 _pc_descs[i] = pc_desc;
386 pc_desc = next;
387 }
388 }
389
390 // adjust pcs_size so that it is a multiple of both oopSize and
391 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple
392 // of oopSize, then 2*sizeof(PcDesc) is)
393 static int adjust_pcs_size(int pcs_size) {
394 int nsize = align_up(pcs_size, oopSize);
395 if ((nsize % sizeof(PcDesc)) != 0) {
396 nsize = pcs_size + sizeof(PcDesc);
397 }
398 assert((nsize % oopSize) == 0, "correct alignment");
399 return nsize;
400 }
401
402
403 int nmethod::total_size() const {
404 return
405 consts_size() +
406 insts_size() +
407 stub_size() +
408 scopes_data_size() +
409 scopes_pcs_size() +
410 handler_table_size() +
411 nul_chk_table_size();
412 }
413
414 address* nmethod::orig_pc_addr(const frame* fr) {
415 return (address*) ((address)fr->unextended_sp() + _orig_pc_offset);
416 }
417
418 const char* nmethod::compile_kind() const {
419 if (is_osr_method()) return "osr";
420 if (method() != NULL && is_native_method()) return "c2n";
421 return NULL;
422 }
423
424 // Fill in default values for various flag fields
425 void nmethod::init_defaults() {
426 _state = not_installed;
427 _has_flushed_dependencies = 0;
428 _lock_count = 0;
429 _stack_traversal_mark = 0;
430 _unload_reported = false; // jvmti state
431 _is_far_code = false; // nmethods are located in CodeCache
432
433 #ifdef ASSERT
434 _oops_are_stale = false;
435 #endif
436
437 _oops_do_mark_link = NULL;
438 _jmethod_id = NULL;
439 _osr_link = NULL;
440 #if INCLUDE_RTM_OPT
441 _rtm_state = NoRTM;
442 #endif
443 }
444
445 nmethod* nmethod::new_native_nmethod(const methodHandle& method,
446 int compile_id,
447 CodeBuffer *code_buffer,
448 int vep_offset,
449 int frame_complete,
450 int frame_size,
451 ByteSize basic_lock_owner_sp_offset,
452 ByteSize basic_lock_sp_offset,
453 OopMapSet* oop_maps) {
454 code_buffer->finalize_oop_references(method);
455 // create nmethod
456 nmethod* nm = NULL;
457 {
458 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
459 int native_nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod));
460 CodeOffsets offsets;
461 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
462 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
463 nm = new (native_nmethod_size, CompLevel_none) nmethod(method(), compiler_none, native_nmethod_size,
464 compile_id, &offsets,
465 code_buffer, frame_size,
466 basic_lock_owner_sp_offset,
467 basic_lock_sp_offset, oop_maps);
468 NOT_PRODUCT(if (nm != NULL) native_nmethod_stats.note_native_nmethod(nm));
469 }
470
471 if (nm != NULL) {
472 // verify nmethod
473 debug_only(nm->verify();) // might block
474
475 nm->log_new_nmethod();
476 nm->make_in_use();
477 }
478 return nm;
479 }
480
481 nmethod* nmethod::new_nmethod(const methodHandle& method,
482 int compile_id,
483 int entry_bci,
484 CodeOffsets* offsets,
485 int orig_pc_offset,
486 DebugInformationRecorder* debug_info,
487 Dependencies* dependencies,
488 CodeBuffer* code_buffer, int frame_size,
489 OopMapSet* oop_maps,
490 ExceptionHandlerTable* handler_table,
491 ImplicitExceptionTable* nul_chk_table,
492 AbstractCompiler* compiler,
493 int comp_level
494 #if INCLUDE_JVMCI
495 , char* speculations,
496 int speculations_len,
497 int nmethod_mirror_index,
498 const char* nmethod_mirror_name,
499 FailedSpeculation** failed_speculations
500 #endif
501 )
502 {
503 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
504 code_buffer->finalize_oop_references(method);
505 // create nmethod
506 nmethod* nm = NULL;
507 { MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
508 #if INCLUDE_JVMCI
509 int jvmci_data_size = !compiler->is_jvmci() ? 0 : JVMCINMethodData::compute_size(nmethod_mirror_name);
510 #endif
511 int nmethod_size =
512 CodeBlob::allocation_size(code_buffer, sizeof(nmethod))
513 + adjust_pcs_size(debug_info->pcs_size())
514 + align_up((int)dependencies->size_in_bytes(), oopSize)
515 + align_up(handler_table->size_in_bytes() , oopSize)
516 + align_up(nul_chk_table->size_in_bytes() , oopSize)
517 #if INCLUDE_JVMCI
518 + align_up(speculations_len , oopSize)
519 + align_up(jvmci_data_size , oopSize)
520 #endif
521 + align_up(debug_info->data_size() , oopSize);
522
523 nm = new (nmethod_size, comp_level)
524 nmethod(method(), compiler->type(), nmethod_size, compile_id, entry_bci, offsets,
525 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size,
526 oop_maps,
527 handler_table,
528 nul_chk_table,
529 compiler,
530 comp_level
531 #if INCLUDE_JVMCI
532 , speculations,
533 speculations_len,
534 jvmci_data_size
535 #endif
536 );
537
538 if (nm != NULL) {
539 #if INCLUDE_JVMCI
540 if (compiler->is_jvmci()) {
541 // Initialize the JVMCINMethodData object inlined into nm
542 nm->jvmci_nmethod_data()->initialize(nmethod_mirror_index, nmethod_mirror_name, failed_speculations);
543 }
544 #endif
545 // To make dependency checking during class loading fast, record
546 // the nmethod dependencies in the classes it is dependent on.
547 // This allows the dependency checking code to simply walk the
548 // class hierarchy above the loaded class, checking only nmethods
549 // which are dependent on those classes. The slow way is to
550 // check every nmethod for dependencies which makes it linear in
551 // the number of methods compiled. For applications with a lot
552 // classes the slow way is too slow.
553 for (Dependencies::DepStream deps(nm); deps.next(); ) {
554 if (deps.type() == Dependencies::call_site_target_value) {
555 // CallSite dependencies are managed on per-CallSite instance basis.
556 oop call_site = deps.argument_oop(0);
557 MethodHandles::add_dependent_nmethod(call_site, nm);
558 } else {
559 Klass* klass = deps.context_type();
560 if (klass == NULL) {
561 continue; // ignore things like evol_method
562 }
563 // record this nmethod as dependent on this klass
564 InstanceKlass::cast(klass)->add_dependent_nmethod(nm);
565 }
566 }
567 NOT_PRODUCT(if (nm != NULL) note_java_nmethod(nm));
568 }
569 }
570 // Do verification and logging outside CodeCache_lock.
571 if (nm != NULL) {
572 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
573 DEBUG_ONLY(nm->verify();)
574 nm->log_new_nmethod();
575 }
576 return nm;
577 }
578
579 // For native wrappers
580 nmethod::nmethod(
581 Method* method,
582 CompilerType type,
583 int nmethod_size,
584 int compile_id,
585 CodeOffsets* offsets,
586 CodeBuffer* code_buffer,
587 int frame_size,
588 ByteSize basic_lock_owner_sp_offset,
589 ByteSize basic_lock_sp_offset,
590 OopMapSet* oop_maps )
591 : CompiledMethod(method, "native nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false),
592 _is_unloading_state(0),
593 _native_receiver_sp_offset(basic_lock_owner_sp_offset),
594 _native_basic_lock_sp_offset(basic_lock_sp_offset)
595 {
596 {
597 int scopes_data_offset = 0;
598 int deoptimize_offset = 0;
599 int deoptimize_mh_offset = 0;
600
601 debug_only(NoSafepointVerifier nsv;)
602 assert_locked_or_safepoint(CodeCache_lock);
603
604 init_defaults();
605 _entry_bci = InvocationEntryBci;
606 // We have no exception handler or deopt handler make the
607 // values something that will never match a pc like the nmethod vtable entry
608 _exception_offset = 0;
609 _orig_pc_offset = 0;
610
611 _consts_offset = data_offset();
612 _stub_offset = data_offset();
613 _oops_offset = data_offset();
614 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize);
615 scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize);
616 _scopes_pcs_offset = scopes_data_offset;
617 _dependencies_offset = _scopes_pcs_offset;
618 _handler_table_offset = _dependencies_offset;
619 _nul_chk_table_offset = _handler_table_offset;
620 #if INCLUDE_JVMCI
621 _speculations_offset = _nul_chk_table_offset;
622 _jvmci_data_offset = _speculations_offset;
623 _nmethod_end_offset = _jvmci_data_offset;
624 #else
625 _nmethod_end_offset = _nul_chk_table_offset;
626 #endif
627 _compile_id = compile_id;
628 _comp_level = CompLevel_none;
629 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
630 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
631 _osr_entry_point = NULL;
632 _exception_cache = NULL;
633 _pc_desc_container.reset_to(NULL);
634 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
635
636 _scopes_data_begin = (address) this + scopes_data_offset;
637 _deopt_handler_begin = (address) this + deoptimize_offset;
638 _deopt_mh_handler_begin = (address) this + deoptimize_mh_offset;
639
640 code_buffer->copy_code_and_locs_to(this);
641 code_buffer->copy_values_to(this);
642
643 clear_unloading_state();
644
645 Universe::heap()->register_nmethod(this);
646 debug_only(Universe::heap()->verify_nmethod(this));
647
648 CodeCache::commit(this);
649 }
650
651 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
652 ttyLocker ttyl; // keep the following output all in one block
653 // This output goes directly to the tty, not the compiler log.
654 // To enable tools to match it up with the compilation activity,
655 // be sure to tag this tty output with the compile ID.
656 if (xtty != NULL) {
657 xtty->begin_head("print_native_nmethod");
658 xtty->method(_method);
659 xtty->stamp();
660 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
661 }
662 // print the header part first
663 print();
664 // then print the requested information
665 if (PrintNativeNMethods) {
666 print_code();
667 if (oop_maps != NULL) {
668 oop_maps->print();
669 }
670 }
671 if (PrintRelocations) {
672 print_relocations();
673 }
674 if (xtty != NULL) {
675 xtty->tail("print_native_nmethod");
676 }
677 }
678 }
679
680 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () {
681 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level));
682 }
683
684 nmethod::nmethod(
685 Method* method,
686 CompilerType type,
687 int nmethod_size,
688 int compile_id,
689 int entry_bci,
690 CodeOffsets* offsets,
691 int orig_pc_offset,
692 DebugInformationRecorder* debug_info,
693 Dependencies* dependencies,
694 CodeBuffer *code_buffer,
695 int frame_size,
696 OopMapSet* oop_maps,
697 ExceptionHandlerTable* handler_table,
698 ImplicitExceptionTable* nul_chk_table,
699 AbstractCompiler* compiler,
700 int comp_level
701 #if INCLUDE_JVMCI
702 , char* speculations,
703 int speculations_len,
704 int jvmci_data_size
705 #endif
706 )
707 : CompiledMethod(method, "nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false),
708 _is_unloading_state(0),
709 _native_receiver_sp_offset(in_ByteSize(-1)),
710 _native_basic_lock_sp_offset(in_ByteSize(-1))
711 {
712 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
713 {
714 debug_only(NoSafepointVerifier nsv;)
715 assert_locked_or_safepoint(CodeCache_lock);
716
717 _deopt_handler_begin = (address) this;
718 _deopt_mh_handler_begin = (address) this;
719
720 init_defaults();
721 _entry_bci = entry_bci;
722 _compile_id = compile_id;
723 _comp_level = comp_level;
724 _orig_pc_offset = orig_pc_offset;
725 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
726
727 // Section offsets
728 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts());
729 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs());
730 set_ctable_begin(header_begin() + _consts_offset);
731
732 #if INCLUDE_JVMCI
733 if (compiler->is_jvmci()) {
734 // JVMCI might not produce any stub sections
735 if (offsets->value(CodeOffsets::Exceptions) != -1) {
736 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions);
737 } else {
738 _exception_offset = -1;
739 }
740 if (offsets->value(CodeOffsets::Deopt) != -1) {
741 _deopt_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::Deopt);
742 } else {
743 _deopt_handler_begin = NULL;
744 }
745 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
746 _deopt_mh_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::DeoptMH);
747 } else {
748 _deopt_mh_handler_begin = NULL;
749 }
750 } else {
751 #endif
752 // Exception handler and deopt handler are in the stub section
753 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set");
754 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set");
755
756 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
757 _deopt_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::Deopt);
758 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
759 _deopt_mh_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::DeoptMH);
760 } else {
761 _deopt_mh_handler_begin = NULL;
762 }
763 #if INCLUDE_JVMCI
764 }
765 #endif
766 if (offsets->value(CodeOffsets::UnwindHandler) != -1) {
767 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler);
768 } else {
769 _unwind_handler_offset = -1;
770 }
771
772 _oops_offset = data_offset();
773 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize);
774 int scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize);
775
776 _scopes_pcs_offset = scopes_data_offset + align_up(debug_info->data_size (), oopSize);
777 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
778 _handler_table_offset = _dependencies_offset + align_up((int)dependencies->size_in_bytes (), oopSize);
779 _nul_chk_table_offset = _handler_table_offset + align_up(handler_table->size_in_bytes(), oopSize);
780 #if INCLUDE_JVMCI
781 _speculations_offset = _nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize);
782 _jvmci_data_offset = _speculations_offset + align_up(speculations_len, oopSize);
783 _nmethod_end_offset = _jvmci_data_offset + align_up(jvmci_data_size, oopSize);
784 #else
785 _nmethod_end_offset = _nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize);
786 #endif
787 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
788 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
789 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry);
790 _exception_cache = NULL;
791
792 _scopes_data_begin = (address) this + scopes_data_offset;
793
794 _pc_desc_container.reset_to(scopes_pcs_begin());
795
796 code_buffer->copy_code_and_locs_to(this);
797 // Copy contents of ScopeDescRecorder to nmethod
798 code_buffer->copy_values_to(this);
799 debug_info->copy_to(this);
800 dependencies->copy_to(this);
801 clear_unloading_state();
802
803 Universe::heap()->register_nmethod(this);
804 debug_only(Universe::heap()->verify_nmethod(this));
805
806 CodeCache::commit(this);
807
808 // Copy contents of ExceptionHandlerTable to nmethod
809 handler_table->copy_to(this);
810 nul_chk_table->copy_to(this);
811
812 #if INCLUDE_JVMCI
813 // Copy speculations to nmethod
814 if (speculations_size() != 0) {
815 memcpy(speculations_begin(), speculations, speculations_len);
816 }
817 #endif
818
819 // we use the information of entry points to find out if a method is
820 // static or non static
821 assert(compiler->is_c2() || compiler->is_jvmci() ||
822 _method->is_static() == (entry_point() == _verified_entry_point),
823 " entry points must be same for static methods and vice versa");
824 }
825 }
826
827 // Print a short set of xml attributes to identify this nmethod. The
828 // output should be embedded in some other element.
829 void nmethod::log_identity(xmlStream* log) const {
830 log->print(" compile_id='%d'", compile_id());
831 const char* nm_kind = compile_kind();
832 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind);
833 log->print(" compiler='%s'", compiler_name());
834 if (TieredCompilation) {
835 log->print(" level='%d'", comp_level());
836 }
837 #if INCLUDE_JVMCI
838 if (jvmci_nmethod_data() != NULL) {
839 const char* jvmci_name = jvmci_nmethod_data()->name();
840 if (jvmci_name != NULL) {
841 log->print(" jvmci_mirror_name='");
842 log->text("%s", jvmci_name);
843 log->print("'");
844 }
845 }
846 #endif
847 }
848
849
850 #define LOG_OFFSET(log, name) \
851 if (p2i(name##_end()) - p2i(name##_begin())) \
852 log->print(" " XSTR(name) "_offset='" INTX_FORMAT "'" , \
853 p2i(name##_begin()) - p2i(this))
854
855
856 void nmethod::log_new_nmethod() const {
857 if (LogCompilation && xtty != NULL) {
858 ttyLocker ttyl;
859 HandleMark hm;
860 xtty->begin_elem("nmethod");
861 log_identity(xtty);
862 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size());
863 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this));
864
865 LOG_OFFSET(xtty, relocation);
866 LOG_OFFSET(xtty, consts);
867 LOG_OFFSET(xtty, insts);
868 LOG_OFFSET(xtty, stub);
869 LOG_OFFSET(xtty, scopes_data);
870 LOG_OFFSET(xtty, scopes_pcs);
871 LOG_OFFSET(xtty, dependencies);
872 LOG_OFFSET(xtty, handler_table);
873 LOG_OFFSET(xtty, nul_chk_table);
874 LOG_OFFSET(xtty, oops);
875 LOG_OFFSET(xtty, metadata);
876
877 xtty->method(method());
878 xtty->stamp();
879 xtty->end_elem();
880 }
881 }
882
883 #undef LOG_OFFSET
884
885
886 // Print out more verbose output usually for a newly created nmethod.
887 void nmethod::print_on(outputStream* st, const char* msg) const {
888 if (st != NULL) {
889 ttyLocker ttyl;
890 if (WizardMode) {
891 CompileTask::print(st, this, msg, /*short_form:*/ true);
892 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this));
893 } else {
894 CompileTask::print(st, this, msg, /*short_form:*/ false);
895 }
896 }
897 }
898
899 void nmethod::maybe_print_nmethod(DirectiveSet* directive) {
900 bool printnmethods = directive->PrintAssemblyOption || directive->PrintNMethodsOption;
901 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
902 print_nmethod(printnmethods);
903 }
904 }
905
906 void nmethod::print_nmethod(bool printmethod) {
907 ttyLocker ttyl; // keep the following output all in one block
908 if (xtty != NULL) {
909 xtty->begin_head("print_nmethod");
910 xtty->stamp();
911 xtty->end_head();
912 }
913 // print the header part first
914 print();
915 // then print the requested information
916 if (printmethod) {
917 print_code();
918 print_pcs();
919 if (oop_maps()) {
920 oop_maps()->print();
921 }
922 }
923 if (printmethod || PrintDebugInfo || CompilerOracle::has_option_string(_method, "PrintDebugInfo")) {
924 print_scopes();
925 }
926 if (printmethod || PrintRelocations || CompilerOracle::has_option_string(_method, "PrintRelocations")) {
927 print_relocations();
928 }
929 if (printmethod || PrintDependencies || CompilerOracle::has_option_string(_method, "PrintDependencies")) {
930 print_dependencies();
931 }
932 if (printmethod || PrintExceptionHandlers) {
933 print_handler_table();
934 print_nul_chk_table();
935 }
936 if (printmethod) {
937 print_recorded_oops();
938 print_recorded_metadata();
939 }
940 if (xtty != NULL) {
941 xtty->tail("print_nmethod");
942 }
943 }
944
945
946 // Promote one word from an assembly-time handle to a live embedded oop.
947 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
948 if (handle == NULL ||
949 // As a special case, IC oops are initialized to 1 or -1.
950 handle == (jobject) Universe::non_oop_word()) {
951 (*dest) = (oop) handle;
952 } else {
953 (*dest) = JNIHandles::resolve_non_null(handle);
954 }
955 }
956
957
958 // Have to have the same name because it's called by a template
959 void nmethod::copy_values(GrowableArray<jobject>* array) {
960 int length = array->length();
961 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
962 oop* dest = oops_begin();
963 for (int index = 0 ; index < length; index++) {
964 initialize_immediate_oop(&dest[index], array->at(index));
965 }
966
967 // Now we can fix up all the oops in the code. We need to do this
968 // in the code because the assembler uses jobjects as placeholders.
969 // The code and relocations have already been initialized by the
970 // CodeBlob constructor, so it is valid even at this early point to
971 // iterate over relocations and patch the code.
972 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true);
973 }
974
975 void nmethod::copy_values(GrowableArray<Metadata*>* array) {
976 int length = array->length();
977 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough");
978 Metadata** dest = metadata_begin();
979 for (int index = 0 ; index < length; index++) {
980 dest[index] = array->at(index);
981 }
982 }
983
984 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) {
985 // re-patch all oop-bearing instructions, just in case some oops moved
986 RelocIterator iter(this, begin, end);
987 while (iter.next()) {
988 if (iter.type() == relocInfo::oop_type) {
989 oop_Relocation* reloc = iter.oop_reloc();
990 if (initialize_immediates && reloc->oop_is_immediate()) {
991 oop* dest = reloc->oop_addr();
992 initialize_immediate_oop(dest, (jobject) *dest);
993 }
994 // Refresh the oop-related bits of this instruction.
995 reloc->fix_oop_relocation();
996 } else if (iter.type() == relocInfo::metadata_type) {
997 metadata_Relocation* reloc = iter.metadata_reloc();
998 reloc->fix_metadata_relocation();
999 }
1000 }
1001 }
1002
1003
1004 void nmethod::verify_clean_inline_caches() {
1005 assert(CompiledICLocker::is_safe(this), "mt unsafe call");
1006
1007 ResourceMark rm;
1008 RelocIterator iter(this, oops_reloc_begin());
1009 while(iter.next()) {
1010 switch(iter.type()) {
1011 case relocInfo::virtual_call_type:
1012 case relocInfo::opt_virtual_call_type: {
1013 CompiledIC *ic = CompiledIC_at(&iter);
1014 // Ok, to lookup references to zombies here
1015 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
1016 assert(cb != NULL, "destination not in CodeBlob?");
1017 nmethod* nm = cb->as_nmethod_or_null();
1018 if( nm != NULL ) {
1019 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
1020 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1021 assert(ic->is_clean(), "IC should be clean");
1022 }
1023 }
1024 break;
1025 }
1026 case relocInfo::static_call_type: {
1027 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
1028 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
1029 assert(cb != NULL, "destination not in CodeBlob?");
1030 nmethod* nm = cb->as_nmethod_or_null();
1031 if( nm != NULL ) {
1032 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
1033 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1034 assert(csc->is_clean(), "IC should be clean");
1035 }
1036 }
1037 break;
1038 }
1039 default:
1040 break;
1041 }
1042 }
1043 }
1044
1045 // This is a private interface with the sweeper.
1046 void nmethod::mark_as_seen_on_stack() {
1047 assert(is_alive(), "Must be an alive method");
1048 // Set the traversal mark to ensure that the sweeper does 2
1049 // cleaning passes before moving to zombie.
1050 set_stack_traversal_mark(NMethodSweeper::traversal_count());
1051 }
1052
1053 // Tell if a non-entrant method can be converted to a zombie (i.e.,
1054 // there are no activations on the stack, not in use by the VM,
1055 // and not in use by the ServiceThread)
1056 bool nmethod::can_convert_to_zombie() {
1057 // Note that this is called when the sweeper has observed the nmethod to be
1058 // not_entrant. However, with concurrent code cache unloading, the state
1059 // might have moved on to unloaded if it is_unloading(), due to racing
1060 // concurrent GC threads.
1061 assert(is_not_entrant() || is_unloading(), "must be a non-entrant method");
1062
1063 // Since the nmethod sweeper only does partial sweep the sweeper's traversal
1064 // count can be greater than the stack traversal count before it hits the
1065 // nmethod for the second time.
1066 // If an is_unloading() nmethod is still not_entrant, then it is not safe to
1067 // convert it to zombie due to GC unloading interactions. However, if it
1068 // has become unloaded, then it is okay to convert such nmethods to zombie.
1069 return stack_traversal_mark() + 1 < NMethodSweeper::traversal_count() &&
1070 !is_locked_by_vm() && (!is_unloading() || is_unloaded());
1071 }
1072
1073 void nmethod::inc_decompile_count() {
1074 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return;
1075 // Could be gated by ProfileTraps, but do not bother...
1076 Method* m = method();
1077 if (m == NULL) return;
1078 MethodData* mdo = m->method_data();
1079 if (mdo == NULL) return;
1080 // There is a benign race here. See comments in methodData.hpp.
1081 mdo->inc_decompile_count();
1082 }
1083
1084 void nmethod::make_unloaded() {
1085 post_compiled_method_unload();
1086
1087 // This nmethod is being unloaded, make sure that dependencies
1088 // recorded in instanceKlasses get flushed.
1089 // Since this work is being done during a GC, defer deleting dependencies from the
1090 // InstanceKlass.
1091 assert(Universe::heap()->is_gc_active() || Thread::current()->is_ConcurrentGC_thread(),
1092 "should only be called during gc");
1093 flush_dependencies(/*delete_immediately*/false);
1094
1095 // Break cycle between nmethod & method
1096 LogTarget(Trace, class, unload, nmethod) lt;
1097 if (lt.is_enabled()) {
1098 LogStream ls(lt);
1099 ls.print("making nmethod " INTPTR_FORMAT
1100 " unloadable, Method*(" INTPTR_FORMAT
1101 ") ",
1102 p2i(this), p2i(_method));
1103 ls.cr();
1104 }
1105 // Unlink the osr method, so we do not look this up again
1106 if (is_osr_method()) {
1107 // Invalidate the osr nmethod only once
1108 if (is_in_use()) {
1109 invalidate_osr_method();
1110 }
1111 #ifdef ASSERT
1112 if (method() != NULL) {
1113 // Make sure osr nmethod is invalidated, i.e. not on the list
1114 bool found = method()->method_holder()->remove_osr_nmethod(this);
1115 assert(!found, "osr nmethod should have been invalidated");
1116 }
1117 #endif
1118 }
1119
1120 // If _method is already NULL the Method* is about to be unloaded,
1121 // so we don't have to break the cycle. Note that it is possible to
1122 // have the Method* live here, in case we unload the nmethod because
1123 // it is pointing to some oop (other than the Method*) being unloaded.
1124 if (_method != NULL) {
1125 _method->unlink_code(this);
1126 }
1127
1128 // Make the class unloaded - i.e., change state and notify sweeper
1129 assert(SafepointSynchronize::is_at_safepoint() || Thread::current()->is_ConcurrentGC_thread(),
1130 "must be at safepoint");
1131
1132 {
1133 // Clear ICStubs and release any CompiledICHolders.
1134 CompiledICLocker ml(this);
1135 clear_ic_callsites();
1136 }
1137
1138 // Unregister must be done before the state change
1139 {
1140 MutexLocker ml(SafepointSynchronize::is_at_safepoint() ? NULL : CodeCache_lock,
1141 Mutex::_no_safepoint_check_flag);
1142 Universe::heap()->unregister_nmethod(this);
1143 CodeCache::unregister_old_nmethod(this);
1144 }
1145
1146 // Clear the method of this dead nmethod
1147 set_method(NULL);
1148
1149 // Log the unloading.
1150 log_state_change();
1151
1152 // The Method* is gone at this point
1153 assert(_method == NULL, "Tautology");
1154
1155 set_osr_link(NULL);
1156 NMethodSweeper::report_state_change(this);
1157
1158 // The release is only needed for compile-time ordering, as accesses
1159 // into the nmethod after the store are not safe due to the sweeper
1160 // being allowed to free it when the store is observed, during
1161 // concurrent nmethod unloading. Therefore, there is no need for
1162 // acquire on the loader side.
1163 OrderAccess::release_store(&_state, (signed char)unloaded);
1164
1165 #if INCLUDE_JVMCI
1166 // Clear the link between this nmethod and a HotSpotNmethod mirror
1167 JVMCINMethodData* nmethod_data = jvmci_nmethod_data();
1168 if (nmethod_data != NULL) {
1169 nmethod_data->invalidate_nmethod_mirror(this);
1170 nmethod_data->clear_nmethod_mirror(this);
1171 }
1172 #endif
1173 }
1174
1175 void nmethod::invalidate_osr_method() {
1176 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
1177 // Remove from list of active nmethods
1178 if (method() != NULL) {
1179 method()->method_holder()->remove_osr_nmethod(this);
1180 }
1181 }
1182
1183 void nmethod::log_state_change() const {
1184 if (LogCompilation) {
1185 if (xtty != NULL) {
1186 ttyLocker ttyl; // keep the following output all in one block
1187 if (_state == unloaded) {
1188 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'",
1189 os::current_thread_id());
1190 } else {
1191 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s",
1192 os::current_thread_id(),
1193 (_state == zombie ? " zombie='1'" : ""));
1194 }
1195 log_identity(xtty);
1196 xtty->stamp();
1197 xtty->end_elem();
1198 }
1199 }
1200
1201 const char *state_msg = _state == zombie ? "made zombie" : "made not entrant";
1202 CompileTask::print_ul(this, state_msg);
1203 if (PrintCompilation && _state != unloaded) {
1204 print_on(tty, state_msg);
1205 }
1206 }
1207
1208 void nmethod::unlink_from_method() {
1209 if (method() != NULL) {
1210 method()->unlink_code();
1211 }
1212 }
1213
1214 /**
1215 * Common functionality for both make_not_entrant and make_zombie
1216 */
1217 bool nmethod::make_not_entrant_or_zombie(int state) {
1218 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant");
1219 assert(!is_zombie(), "should not already be a zombie");
1220
1221 if (_state == state) {
1222 // Avoid taking the lock if already in required state.
1223 // This is safe from races because the state is an end-state,
1224 // which the nmethod cannot back out of once entered.
1225 // No need for fencing either.
1226 return false;
1227 }
1228
1229 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below.
1230 nmethodLocker nml(this);
1231 methodHandle the_method(method());
1232 // This can be called while the system is already at a safepoint which is ok
1233 NoSafepointVerifier nsv(true, !SafepointSynchronize::is_at_safepoint());
1234
1235 // during patching, depending on the nmethod state we must notify the GC that
1236 // code has been unloaded, unregistering it. We cannot do this right while
1237 // holding the CompiledMethod_lock because we need to use the CodeCache_lock. This
1238 // would be prone to deadlocks.
1239 // This flag is used to remember whether we need to later lock and unregister.
1240 bool nmethod_needs_unregister = false;
1241
1242 // invalidate osr nmethod before acquiring the patching lock since
1243 // they both acquire leaf locks and we don't want a deadlock.
1244 // This logic is equivalent to the logic below for patching the
1245 // verified entry point of regular methods. We check that the
1246 // nmethod is in use to ensure that it is invalidated only once.
1247 if (is_osr_method() && is_in_use()) {
1248 // this effectively makes the osr nmethod not entrant
1249 invalidate_osr_method();
1250 }
1251
1252 {
1253 // Enter critical section. Does not block for safepoint.
1254 MutexLocker pl(CompiledMethod_lock, Mutex::_no_safepoint_check_flag);
1255
1256 if (_state == state) {
1257 // another thread already performed this transition so nothing
1258 // to do, but return false to indicate this.
1259 return false;
1260 }
1261
1262 // The caller can be calling the method statically or through an inline
1263 // cache call.
1264 if (!is_osr_method() && !is_not_entrant()) {
1265 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
1266 SharedRuntime::get_handle_wrong_method_stub());
1267 }
1268
1269 if (is_in_use() && update_recompile_counts()) {
1270 // It's a true state change, so mark the method as decompiled.
1271 // Do it only for transition from alive.
1272 inc_decompile_count();
1273 }
1274
1275 // If the state is becoming a zombie, signal to unregister the nmethod with
1276 // the heap.
1277 // This nmethod may have already been unloaded during a full GC.
1278 if ((state == zombie) && !is_unloaded()) {
1279 nmethod_needs_unregister = true;
1280 }
1281
1282 // Must happen before state change. Otherwise we have a race condition in
1283 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately
1284 // transition its state from 'not_entrant' to 'zombie' without having to wait
1285 // for stack scanning.
1286 if (state == not_entrant) {
1287 mark_as_seen_on_stack();
1288 OrderAccess::storestore(); // _stack_traversal_mark and _state
1289 }
1290
1291 // Change state
1292 _state = state;
1293
1294 // Log the transition once
1295 log_state_change();
1296
1297 // Remove nmethod from method.
1298 unlink_from_method();
1299
1300 } // leave critical region under CompiledMethod_lock
1301
1302 #if INCLUDE_JVMCI
1303 // Invalidate can't occur while holding the Patching lock
1304 JVMCINMethodData* nmethod_data = jvmci_nmethod_data();
1305 if (nmethod_data != NULL) {
1306 nmethod_data->invalidate_nmethod_mirror(this);
1307 }
1308 #endif
1309
1310 #ifdef ASSERT
1311 if (is_osr_method() && method() != NULL) {
1312 // Make sure osr nmethod is invalidated, i.e. not on the list
1313 bool found = method()->method_holder()->remove_osr_nmethod(this);
1314 assert(!found, "osr nmethod should have been invalidated");
1315 }
1316 #endif
1317
1318 // When the nmethod becomes zombie it is no longer alive so the
1319 // dependencies must be flushed. nmethods in the not_entrant
1320 // state will be flushed later when the transition to zombie
1321 // happens or they get unloaded.
1322 if (state == zombie) {
1323 {
1324 // Flushing dependencies must be done before any possible
1325 // safepoint can sneak in, otherwise the oops used by the
1326 // dependency logic could have become stale.
1327 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1328 if (nmethod_needs_unregister) {
1329 Universe::heap()->unregister_nmethod(this);
1330 CodeCache::unregister_old_nmethod(this);
1331 }
1332 flush_dependencies(/*delete_immediately*/true);
1333 }
1334
1335 #if INCLUDE_JVMCI
1336 // Now that the nmethod has been unregistered, it's
1337 // safe to clear the HotSpotNmethod mirror oop.
1338 if (nmethod_data != NULL) {
1339 nmethod_data->clear_nmethod_mirror(this);
1340 }
1341 #endif
1342
1343 // Clear ICStubs to prevent back patching stubs of zombie or flushed
1344 // nmethods during the next safepoint (see ICStub::finalize), as well
1345 // as to free up CompiledICHolder resources.
1346 {
1347 CompiledICLocker ml(this);
1348 clear_ic_callsites();
1349 }
1350
1351 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload
1352 // event and it hasn't already been reported for this nmethod then
1353 // report it now. The event may have been reported earlier if the GC
1354 // marked it for unloading). JvmtiDeferredEventQueue support means
1355 // we no longer go to a safepoint here.
1356 post_compiled_method_unload();
1357
1358 #ifdef ASSERT
1359 // It's no longer safe to access the oops section since zombie
1360 // nmethods aren't scanned for GC.
1361 _oops_are_stale = true;
1362 #endif
1363 // the Method may be reclaimed by class unloading now that the
1364 // nmethod is in zombie state
1365 set_method(NULL);
1366 } else {
1367 assert(state == not_entrant, "other cases may need to be handled differently");
1368 }
1369
1370 if (TraceCreateZombies && state == zombie) {
1371 ResourceMark m;
1372 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");
1373 }
1374
1375 NMethodSweeper::report_state_change(this);
1376 return true;
1377 }
1378
1379 void nmethod::flush() {
1380 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1381 // Note that there are no valid oops in the nmethod anymore.
1382 assert(!is_osr_method() || is_unloaded() || is_zombie(),
1383 "osr nmethod must be unloaded or zombie before flushing");
1384 assert(is_zombie() || is_osr_method(), "must be a zombie method");
1385 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed");
1386 assert_locked_or_safepoint(CodeCache_lock);
1387
1388 // completely deallocate this method
1389 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, p2i(this));
1390 if (PrintMethodFlushing) {
1391 tty->print_cr("*flushing %s nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT
1392 "/Free CodeCache:" SIZE_FORMAT "Kb",
1393 is_osr_method() ? "osr" : "",_compile_id, p2i(this), CodeCache::blob_count(),
1394 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024);
1395 }
1396
1397 // We need to deallocate any ExceptionCache data.
1398 // Note that we do not need to grab the nmethod lock for this, it
1399 // better be thread safe if we're disposing of it!
1400 ExceptionCache* ec = exception_cache();
1401 set_exception_cache(NULL);
1402 while(ec != NULL) {
1403 ExceptionCache* next = ec->next();
1404 delete ec;
1405 ec = next;
1406 }
1407
1408 Universe::heap()->flush_nmethod(this);
1409
1410 CodeBlob::flush();
1411 CodeCache::free(this);
1412 }
1413
1414 oop nmethod::oop_at(int index) const {
1415 if (index == 0) {
1416 return NULL;
1417 }
1418 return NativeAccess<AS_NO_KEEPALIVE>::oop_load(oop_addr_at(index));
1419 }
1420
1421 //
1422 // Notify all classes this nmethod is dependent on that it is no
1423 // longer dependent. This should only be called in two situations.
1424 // First, when a nmethod transitions to a zombie all dependents need
1425 // to be clear. Since zombification happens at a safepoint there's no
1426 // synchronization issues. The second place is a little more tricky.
1427 // During phase 1 of mark sweep class unloading may happen and as a
1428 // result some nmethods may get unloaded. In this case the flushing
1429 // of dependencies must happen during phase 1 since after GC any
1430 // dependencies in the unloaded nmethod won't be updated, so
1431 // traversing the dependency information in unsafe. In that case this
1432 // function is called with a boolean argument and this function only
1433 // notifies instanceKlasses that are reachable
1434
1435 void nmethod::flush_dependencies(bool delete_immediately) {
1436 DEBUG_ONLY(bool called_by_gc = Universe::heap()->is_gc_active() || Thread::current()->is_ConcurrentGC_thread();)
1437 assert(called_by_gc != delete_immediately,
1438 "delete_immediately is false if and only if we are called during GC");
1439 if (!has_flushed_dependencies()) {
1440 set_has_flushed_dependencies();
1441 for (Dependencies::DepStream deps(this); deps.next(); ) {
1442 if (deps.type() == Dependencies::call_site_target_value) {
1443 // CallSite dependencies are managed on per-CallSite instance basis.
1444 oop call_site = deps.argument_oop(0);
1445 if (delete_immediately) {
1446 assert_locked_or_safepoint(CodeCache_lock);
1447 MethodHandles::remove_dependent_nmethod(call_site, this);
1448 } else {
1449 MethodHandles::clean_dependency_context(call_site);
1450 }
1451 } else {
1452 Klass* klass = deps.context_type();
1453 if (klass == NULL) {
1454 continue; // ignore things like evol_method
1455 }
1456 // During GC delete_immediately is false, and liveness
1457 // of dependee determines class that needs to be updated.
1458 if (delete_immediately) {
1459 assert_locked_or_safepoint(CodeCache_lock);
1460 InstanceKlass::cast(klass)->remove_dependent_nmethod(this);
1461 } else if (klass->is_loader_alive()) {
1462 // The GC may clean dependency contexts concurrently and in parallel.
1463 InstanceKlass::cast(klass)->clean_dependency_context();
1464 }
1465 }
1466 }
1467 }
1468 }
1469
1470 // ------------------------------------------------------------------
1471 // post_compiled_method_load_event
1472 // new method for install_code() path
1473 // Transfer information from compilation to jvmti
1474 void nmethod::post_compiled_method_load_event() {
1475
1476 Method* moop = method();
1477 HOTSPOT_COMPILED_METHOD_LOAD(
1478 (char *) moop->klass_name()->bytes(),
1479 moop->klass_name()->utf8_length(),
1480 (char *) moop->name()->bytes(),
1481 moop->name()->utf8_length(),
1482 (char *) moop->signature()->bytes(),
1483 moop->signature()->utf8_length(),
1484 insts_begin(), insts_size());
1485
1486 if (JvmtiExport::should_post_compiled_method_load() ||
1487 JvmtiExport::should_post_compiled_method_unload()) {
1488 get_and_cache_jmethod_id();
1489 }
1490
1491 if (JvmtiExport::should_post_compiled_method_load()) {
1492 // Let the Service thread (which is a real Java thread) post the event
1493 MutexLocker ml(Service_lock, Mutex::_no_safepoint_check_flag);
1494 JvmtiDeferredEventQueue::enqueue(
1495 JvmtiDeferredEvent::compiled_method_load_event(this));
1496 }
1497 }
1498
1499 jmethodID nmethod::get_and_cache_jmethod_id() {
1500 if (_jmethod_id == NULL) {
1501 // Cache the jmethod_id since it can no longer be looked up once the
1502 // method itself has been marked for unloading.
1503 _jmethod_id = method()->jmethod_id();
1504 }
1505 return _jmethod_id;
1506 }
1507
1508 void nmethod::post_compiled_method_unload() {
1509 if (unload_reported()) {
1510 // During unloading we transition to unloaded and then to zombie
1511 // and the unloading is reported during the first transition.
1512 return;
1513 }
1514
1515 assert(_method != NULL && !is_unloaded(), "just checking");
1516 DTRACE_METHOD_UNLOAD_PROBE(method());
1517
1518 // If a JVMTI agent has enabled the CompiledMethodUnload event then
1519 // post the event. Sometime later this nmethod will be made a zombie
1520 // by the sweeper but the Method* will not be valid at that point.
1521 // If the _jmethod_id is null then no load event was ever requested
1522 // so don't bother posting the unload. The main reason for this is
1523 // that the jmethodID is a weak reference to the Method* so if
1524 // it's being unloaded there's no way to look it up since the weak
1525 // ref will have been cleared.
1526 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) {
1527 assert(!unload_reported(), "already unloaded");
1528 JvmtiDeferredEvent event =
1529 JvmtiDeferredEvent::compiled_method_unload_event(this,
1530 _jmethod_id, insts_begin());
1531 MutexLocker ml(Service_lock, Mutex::_no_safepoint_check_flag);
1532 JvmtiDeferredEventQueue::enqueue(event);
1533 }
1534
1535 // The JVMTI CompiledMethodUnload event can be enabled or disabled at
1536 // any time. As the nmethod is being unloaded now we mark it has
1537 // having the unload event reported - this will ensure that we don't
1538 // attempt to report the event in the unlikely scenario where the
1539 // event is enabled at the time the nmethod is made a zombie.
1540 set_unload_reported();
1541 }
1542
1543 // Iterate over metadata calling this function. Used by RedefineClasses
1544 void nmethod::metadata_do(MetadataClosure* f) {
1545 {
1546 // Visit all immediate references that are embedded in the instruction stream.
1547 RelocIterator iter(this, oops_reloc_begin());
1548 while (iter.next()) {
1549 if (iter.type() == relocInfo::metadata_type ) {
1550 metadata_Relocation* r = iter.metadata_reloc();
1551 // In this metadata, we must only follow those metadatas directly embedded in
1552 // the code. Other metadatas (oop_index>0) are seen as part of
1553 // the metadata section below.
1554 assert(1 == (r->metadata_is_immediate()) +
1555 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
1556 "metadata must be found in exactly one place");
1557 if (r->metadata_is_immediate() && r->metadata_value() != NULL) {
1558 Metadata* md = r->metadata_value();
1559 if (md != _method) f->do_metadata(md);
1560 }
1561 } else if (iter.type() == relocInfo::virtual_call_type) {
1562 // Check compiledIC holders associated with this nmethod
1563 ResourceMark rm;
1564 CompiledIC *ic = CompiledIC_at(&iter);
1565 if (ic->is_icholder_call()) {
1566 CompiledICHolder* cichk = ic->cached_icholder();
1567 f->do_metadata(cichk->holder_metadata());
1568 f->do_metadata(cichk->holder_klass());
1569 } else {
1570 Metadata* ic_oop = ic->cached_metadata();
1571 if (ic_oop != NULL) {
1572 f->do_metadata(ic_oop);
1573 }
1574 }
1575 }
1576 }
1577 }
1578
1579 // Visit the metadata section
1580 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
1581 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops
1582 Metadata* md = *p;
1583 f->do_metadata(md);
1584 }
1585
1586 // Visit metadata not embedded in the other places.
1587 if (_method != NULL) f->do_metadata(_method);
1588 }
1589
1590 // The _is_unloading_state encodes a tuple comprising the unloading cycle
1591 // and the result of IsUnloadingBehaviour::is_unloading() fpr that cycle.
1592 // This is the bit layout of the _is_unloading_state byte: 00000CCU
1593 // CC refers to the cycle, which has 2 bits, and U refers to the result of
1594 // IsUnloadingBehaviour::is_unloading() for that unloading cycle.
1595
1596 class IsUnloadingState: public AllStatic {
1597 static const uint8_t _is_unloading_mask = 1;
1598 static const uint8_t _is_unloading_shift = 0;
1599 static const uint8_t _unloading_cycle_mask = 6;
1600 static const uint8_t _unloading_cycle_shift = 1;
1601
1602 static uint8_t set_is_unloading(uint8_t state, bool value) {
1603 state &= ~_is_unloading_mask;
1604 if (value) {
1605 state |= 1 << _is_unloading_shift;
1606 }
1607 assert(is_unloading(state) == value, "unexpected unloading cycle overflow");
1608 return state;
1609 }
1610
1611 static uint8_t set_unloading_cycle(uint8_t state, uint8_t value) {
1612 state &= ~_unloading_cycle_mask;
1613 state |= value << _unloading_cycle_shift;
1614 assert(unloading_cycle(state) == value, "unexpected unloading cycle overflow");
1615 return state;
1616 }
1617
1618 public:
1619 static bool is_unloading(uint8_t state) { return (state & _is_unloading_mask) >> _is_unloading_shift == 1; }
1620 static uint8_t unloading_cycle(uint8_t state) { return (state & _unloading_cycle_mask) >> _unloading_cycle_shift; }
1621
1622 static uint8_t create(bool is_unloading, uint8_t unloading_cycle) {
1623 uint8_t state = 0;
1624 state = set_is_unloading(state, is_unloading);
1625 state = set_unloading_cycle(state, unloading_cycle);
1626 return state;
1627 }
1628 };
1629
1630 bool nmethod::is_unloading() {
1631 uint8_t state = RawAccess<MO_RELAXED>::load(&_is_unloading_state);
1632 bool state_is_unloading = IsUnloadingState::is_unloading(state);
1633 uint8_t state_unloading_cycle = IsUnloadingState::unloading_cycle(state);
1634 if (state_is_unloading) {
1635 return true;
1636 }
1637 uint8_t current_cycle = CodeCache::unloading_cycle();
1638 if (state_unloading_cycle == current_cycle) {
1639 return false;
1640 }
1641
1642 // The IsUnloadingBehaviour is responsible for checking if there are any dead
1643 // oops in the CompiledMethod, by calling oops_do on it.
1644 state_unloading_cycle = current_cycle;
1645
1646 if (is_zombie()) {
1647 // Zombies without calculated unloading epoch are never unloading due to GC.
1648
1649 // There are no races where a previously observed is_unloading() nmethod
1650 // suddenly becomes not is_unloading() due to here being observed as zombie.
1651
1652 // With STW unloading, all is_alive() && is_unloading() nmethods are unlinked
1653 // and unloaded in the safepoint. That makes races where an nmethod is first
1654 // observed as is_alive() && is_unloading() and subsequently observed as
1655 // is_zombie() impossible.
1656
1657 // With concurrent unloading, all references to is_unloading() nmethods are
1658 // first unlinked (e.g. IC caches and dependency contexts). Then a global
1659 // handshake operation is performed with all JavaThreads before finally
1660 // unloading the nmethods. The sweeper never converts is_alive() && is_unloading()
1661 // nmethods to zombies; it waits for them to become is_unloaded(). So before
1662 // the global handshake, it is impossible for is_unloading() nmethods to
1663 // racingly become is_zombie(). And is_unloading() is calculated for all is_alive()
1664 // nmethods before taking that global handshake, meaning that it will never
1665 // be recalculated after the handshake.
1666
1667 // After that global handshake, is_unloading() nmethods are only observable
1668 // to the iterators, and they will never trigger recomputation of the cached
1669 // is_unloading_state, and hence may not suffer from such races.
1670
1671 state_is_unloading = false;
1672 } else {
1673 state_is_unloading = IsUnloadingBehaviour::current()->is_unloading(this);
1674 }
1675
1676 state = IsUnloadingState::create(state_is_unloading, state_unloading_cycle);
1677
1678 RawAccess<MO_RELAXED>::store(&_is_unloading_state, state);
1679
1680 return state_is_unloading;
1681 }
1682
1683 void nmethod::clear_unloading_state() {
1684 uint8_t state = IsUnloadingState::create(false, CodeCache::unloading_cycle());
1685 RawAccess<MO_RELAXED>::store(&_is_unloading_state, state);
1686 }
1687
1688
1689 // This is called at the end of the strong tracing/marking phase of a
1690 // GC to unload an nmethod if it contains otherwise unreachable
1691 // oops.
1692
1693 void nmethod::do_unloading(bool unloading_occurred) {
1694 // Make sure the oop's ready to receive visitors
1695 assert(!is_zombie() && !is_unloaded(),
1696 "should not call follow on zombie or unloaded nmethod");
1697
1698 if (is_unloading()) {
1699 make_unloaded();
1700 } else {
1701 guarantee(unload_nmethod_caches(unloading_occurred),
1702 "Should not need transition stubs");
1703 }
1704 }
1705
1706 void nmethod::oops_do(OopClosure* f, bool allow_zombie) {
1707 // make sure the oops ready to receive visitors
1708 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod");
1709 assert(!is_unloaded(), "should not call follow on unloaded nmethod");
1710
1711 // Prevent extra code cache walk for platforms that don't have immediate oops.
1712 if (relocInfo::mustIterateImmediateOopsInCode()) {
1713 RelocIterator iter(this, oops_reloc_begin());
1714
1715 while (iter.next()) {
1716 if (iter.type() == relocInfo::oop_type ) {
1717 oop_Relocation* r = iter.oop_reloc();
1718 // In this loop, we must only follow those oops directly embedded in
1719 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1720 assert(1 == (r->oop_is_immediate()) +
1721 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1722 "oop must be found in exactly one place");
1723 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1724 f->do_oop(r->oop_addr());
1725 }
1726 }
1727 }
1728 }
1729
1730 // Scopes
1731 // This includes oop constants not inlined in the code stream.
1732 for (oop* p = oops_begin(); p < oops_end(); p++) {
1733 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1734 f->do_oop(p);
1735 }
1736 }
1737
1738 #define NMETHOD_SENTINEL ((nmethod*)badAddress)
1739
1740 nmethod* volatile nmethod::_oops_do_mark_nmethods;
1741
1742 // An nmethod is "marked" if its _mark_link is set non-null.
1743 // Even if it is the end of the linked list, it will have a non-null link value,
1744 // as long as it is on the list.
1745 // This code must be MP safe, because it is used from parallel GC passes.
1746 bool nmethod::test_set_oops_do_mark() {
1747 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");
1748 if (_oops_do_mark_link == NULL) {
1749 // Claim this nmethod for this thread to mark.
1750 if (Atomic::replace_if_null(NMETHOD_SENTINEL, &_oops_do_mark_link)) {
1751 // Atomically append this nmethod (now claimed) to the head of the list:
1752 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods;
1753 for (;;) {
1754 nmethod* required_mark_nmethods = observed_mark_nmethods;
1755 _oops_do_mark_link = required_mark_nmethods;
1756 observed_mark_nmethods =
1757 Atomic::cmpxchg(this, &_oops_do_mark_nmethods, required_mark_nmethods);
1758 if (observed_mark_nmethods == required_mark_nmethods)
1759 break;
1760 }
1761 // Mark was clear when we first saw this guy.
1762 LogTarget(Trace, gc, nmethod) lt;
1763 if (lt.is_enabled()) {
1764 LogStream ls(lt);
1765 CompileTask::print(&ls, this, "oops_do, mark", /*short_form:*/ true);
1766 }
1767 return false;
1768 }
1769 }
1770 // On fall through, another racing thread marked this nmethod before we did.
1771 return true;
1772 }
1773
1774 void nmethod::oops_do_marking_prologue() {
1775 log_trace(gc, nmethod)("oops_do_marking_prologue");
1776 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row");
1777 // We use cmpxchg instead of regular assignment here because the user
1778 // may fork a bunch of threads, and we need them all to see the same state.
1779 nmethod* observed = Atomic::cmpxchg(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, (nmethod*)NULL);
1780 guarantee(observed == NULL, "no races in this sequential code");
1781 }
1782
1783 void nmethod::oops_do_marking_epilogue() {
1784 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row");
1785 nmethod* cur = _oops_do_mark_nmethods;
1786 while (cur != NMETHOD_SENTINEL) {
1787 assert(cur != NULL, "not NULL-terminated");
1788 nmethod* next = cur->_oops_do_mark_link;
1789 cur->_oops_do_mark_link = NULL;
1790 DEBUG_ONLY(cur->verify_oop_relocations());
1791
1792 LogTarget(Trace, gc, nmethod) lt;
1793 if (lt.is_enabled()) {
1794 LogStream ls(lt);
1795 CompileTask::print(&ls, cur, "oops_do, unmark", /*short_form:*/ true);
1796 }
1797 cur = next;
1798 }
1799 nmethod* required = _oops_do_mark_nmethods;
1800 nmethod* observed = Atomic::cmpxchg((nmethod*)NULL, &_oops_do_mark_nmethods, required);
1801 guarantee(observed == required, "no races in this sequential code");
1802 log_trace(gc, nmethod)("oops_do_marking_epilogue");
1803 }
1804
1805 inline bool includes(void* p, void* from, void* to) {
1806 return from <= p && p < to;
1807 }
1808
1809
1810 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
1811 assert(count >= 2, "must be sentinel values, at least");
1812
1813 #ifdef ASSERT
1814 // must be sorted and unique; we do a binary search in find_pc_desc()
1815 int prev_offset = pcs[0].pc_offset();
1816 assert(prev_offset == PcDesc::lower_offset_limit,
1817 "must start with a sentinel");
1818 for (int i = 1; i < count; i++) {
1819 int this_offset = pcs[i].pc_offset();
1820 assert(this_offset > prev_offset, "offsets must be sorted");
1821 prev_offset = this_offset;
1822 }
1823 assert(prev_offset == PcDesc::upper_offset_limit,
1824 "must end with a sentinel");
1825 #endif //ASSERT
1826
1827 // Search for MethodHandle invokes and tag the nmethod.
1828 for (int i = 0; i < count; i++) {
1829 if (pcs[i].is_method_handle_invoke()) {
1830 set_has_method_handle_invokes(true);
1831 break;
1832 }
1833 }
1834 assert(has_method_handle_invokes() == (_deopt_mh_handler_begin != NULL), "must have deopt mh handler");
1835
1836 int size = count * sizeof(PcDesc);
1837 assert(scopes_pcs_size() >= size, "oob");
1838 memcpy(scopes_pcs_begin(), pcs, size);
1839
1840 // Adjust the final sentinel downward.
1841 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
1842 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
1843 last_pc->set_pc_offset(content_size() + 1);
1844 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
1845 // Fill any rounding gaps with copies of the last record.
1846 last_pc[1] = last_pc[0];
1847 }
1848 // The following assert could fail if sizeof(PcDesc) is not
1849 // an integral multiple of oopSize (the rounding term).
1850 // If it fails, change the logic to always allocate a multiple
1851 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
1852 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
1853 }
1854
1855 void nmethod::copy_scopes_data(u_char* buffer, int size) {
1856 assert(scopes_data_size() >= size, "oob");
1857 memcpy(scopes_data_begin(), buffer, size);
1858 }
1859
1860 #ifdef ASSERT
1861 static PcDesc* linear_search(const PcDescSearch& search, int pc_offset, bool approximate) {
1862 PcDesc* lower = search.scopes_pcs_begin();
1863 PcDesc* upper = search.scopes_pcs_end();
1864 lower += 1; // exclude initial sentinel
1865 PcDesc* res = NULL;
1866 for (PcDesc* p = lower; p < upper; p++) {
1867 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc
1868 if (match_desc(p, pc_offset, approximate)) {
1869 if (res == NULL)
1870 res = p;
1871 else
1872 res = (PcDesc*) badAddress;
1873 }
1874 }
1875 return res;
1876 }
1877 #endif
1878
1879
1880 // Finds a PcDesc with real-pc equal to "pc"
1881 PcDesc* PcDescContainer::find_pc_desc_internal(address pc, bool approximate, const PcDescSearch& search) {
1882 address base_address = search.code_begin();
1883 if ((pc < base_address) ||
1884 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
1885 return NULL; // PC is wildly out of range
1886 }
1887 int pc_offset = (int) (pc - base_address);
1888
1889 // Check the PcDesc cache if it contains the desired PcDesc
1890 // (This as an almost 100% hit rate.)
1891 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
1892 if (res != NULL) {
1893 assert(res == linear_search(search, pc_offset, approximate), "cache ok");
1894 return res;
1895 }
1896
1897 // Fallback algorithm: quasi-linear search for the PcDesc
1898 // Find the last pc_offset less than the given offset.
1899 // The successor must be the required match, if there is a match at all.
1900 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
1901 PcDesc* lower = search.scopes_pcs_begin();
1902 PcDesc* upper = search.scopes_pcs_end();
1903 upper -= 1; // exclude final sentinel
1904 if (lower >= upper) return NULL; // native method; no PcDescs at all
1905
1906 #define assert_LU_OK \
1907 /* invariant on lower..upper during the following search: */ \
1908 assert(lower->pc_offset() < pc_offset, "sanity"); \
1909 assert(upper->pc_offset() >= pc_offset, "sanity")
1910 assert_LU_OK;
1911
1912 // Use the last successful return as a split point.
1913 PcDesc* mid = _pc_desc_cache.last_pc_desc();
1914 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1915 if (mid->pc_offset() < pc_offset) {
1916 lower = mid;
1917 } else {
1918 upper = mid;
1919 }
1920
1921 // Take giant steps at first (4096, then 256, then 16, then 1)
1922 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
1923 const int RADIX = (1 << LOG2_RADIX);
1924 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
1925 while ((mid = lower + step) < upper) {
1926 assert_LU_OK;
1927 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1928 if (mid->pc_offset() < pc_offset) {
1929 lower = mid;
1930 } else {
1931 upper = mid;
1932 break;
1933 }
1934 }
1935 assert_LU_OK;
1936 }
1937
1938 // Sneak up on the value with a linear search of length ~16.
1939 while (true) {
1940 assert_LU_OK;
1941 mid = lower + 1;
1942 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1943 if (mid->pc_offset() < pc_offset) {
1944 lower = mid;
1945 } else {
1946 upper = mid;
1947 break;
1948 }
1949 }
1950 #undef assert_LU_OK
1951
1952 if (match_desc(upper, pc_offset, approximate)) {
1953 assert(upper == linear_search(search, pc_offset, approximate), "search ok");
1954 _pc_desc_cache.add_pc_desc(upper);
1955 return upper;
1956 } else {
1957 assert(NULL == linear_search(search, pc_offset, approximate), "search ok");
1958 return NULL;
1959 }
1960 }
1961
1962
1963 void nmethod::check_all_dependencies(DepChange& changes) {
1964 // Checked dependencies are allocated into this ResourceMark
1965 ResourceMark rm;
1966
1967 // Turn off dependency tracing while actually testing dependencies.
1968 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) );
1969
1970 typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash,
1971 &DependencySignature::equals, 11027> DepTable;
1972
1973 DepTable* table = new DepTable();
1974
1975 // Iterate over live nmethods and check dependencies of all nmethods that are not
1976 // marked for deoptimization. A particular dependency is only checked once.
1977 NMethodIterator iter(NMethodIterator::only_alive_and_not_unloading);
1978 while(iter.next()) {
1979 nmethod* nm = iter.method();
1980 // Only notify for live nmethods
1981 if (!nm->is_marked_for_deoptimization()) {
1982 for (Dependencies::DepStream deps(nm); deps.next(); ) {
1983 // Construct abstraction of a dependency.
1984 DependencySignature* current_sig = new DependencySignature(deps);
1985
1986 // Determine if dependency is already checked. table->put(...) returns
1987 // 'true' if the dependency is added (i.e., was not in the hashtable).
1988 if (table->put(*current_sig, 1)) {
1989 if (deps.check_dependency() != NULL) {
1990 // Dependency checking failed. Print out information about the failed
1991 // dependency and finally fail with an assert. We can fail here, since
1992 // dependency checking is never done in a product build.
1993 tty->print_cr("Failed dependency:");
1994 changes.print();
1995 nm->print();
1996 nm->print_dependencies();
1997 assert(false, "Should have been marked for deoptimization");
1998 }
1999 }
2000 }
2001 }
2002 }
2003 }
2004
2005 bool nmethod::check_dependency_on(DepChange& changes) {
2006 // What has happened:
2007 // 1) a new class dependee has been added
2008 // 2) dependee and all its super classes have been marked
2009 bool found_check = false; // set true if we are upset
2010 for (Dependencies::DepStream deps(this); deps.next(); ) {
2011 // Evaluate only relevant dependencies.
2012 if (deps.spot_check_dependency_at(changes) != NULL) {
2013 found_check = true;
2014 NOT_DEBUG(break);
2015 }
2016 }
2017 return found_check;
2018 }
2019
2020 // Called from mark_for_deoptimization, when dependee is invalidated.
2021 bool nmethod::is_dependent_on_method(Method* dependee) {
2022 for (Dependencies::DepStream deps(this); deps.next(); ) {
2023 if (deps.type() != Dependencies::evol_method)
2024 continue;
2025 Method* method = deps.method_argument(0);
2026 if (method == dependee) return true;
2027 }
2028 return false;
2029 }
2030
2031
2032 bool nmethod::is_patchable_at(address instr_addr) {
2033 assert(insts_contains(instr_addr), "wrong nmethod used");
2034 if (is_zombie()) {
2035 // a zombie may never be patched
2036 return false;
2037 }
2038 return true;
2039 }
2040
2041
2042 address nmethod::continuation_for_implicit_exception(address pc) {
2043 // Exception happened outside inline-cache check code => we are inside
2044 // an active nmethod => use cpc to determine a return address
2045 int exception_offset = pc - code_begin();
2046 int cont_offset = ImplicitExceptionTable(this).at( exception_offset );
2047 #ifdef ASSERT
2048 if (cont_offset == 0) {
2049 Thread* thread = Thread::current();
2050 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
2051 HandleMark hm(thread);
2052 ResourceMark rm(thread);
2053 CodeBlob* cb = CodeCache::find_blob(pc);
2054 assert(cb != NULL && cb == this, "");
2055 ttyLocker ttyl;
2056 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, p2i(pc));
2057 print();
2058 method()->print_codes();
2059 print_code();
2060 print_pcs();
2061 }
2062 #endif
2063 if (cont_offset == 0) {
2064 // Let the normal error handling report the exception
2065 return NULL;
2066 }
2067 return code_begin() + cont_offset;
2068 }
2069
2070
2071
2072 void nmethod_init() {
2073 // make sure you didn't forget to adjust the filler fields
2074 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
2075 }
2076
2077
2078 //-------------------------------------------------------------------------------------------
2079
2080
2081 // QQQ might we make this work from a frame??
2082 nmethodLocker::nmethodLocker(address pc) {
2083 CodeBlob* cb = CodeCache::find_blob(pc);
2084 guarantee(cb != NULL && cb->is_compiled(), "bad pc for a nmethod found");
2085 _nm = cb->as_compiled_method();
2086 lock_nmethod(_nm);
2087 }
2088
2089 // Only JvmtiDeferredEvent::compiled_method_unload_event()
2090 // should pass zombie_ok == true.
2091 void nmethodLocker::lock_nmethod(CompiledMethod* cm, bool zombie_ok) {
2092 if (cm == NULL) return;
2093 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method
2094 nmethod* nm = cm->as_nmethod();
2095 Atomic::inc(&nm->_lock_count);
2096 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method: %p", nm);
2097 }
2098
2099 void nmethodLocker::unlock_nmethod(CompiledMethod* cm) {
2100 if (cm == NULL) return;
2101 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method
2102 nmethod* nm = cm->as_nmethod();
2103 Atomic::dec(&nm->_lock_count);
2104 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock");
2105 }
2106
2107
2108 // -----------------------------------------------------------------------------
2109 // Verification
2110
2111 class VerifyOopsClosure: public OopClosure {
2112 nmethod* _nm;
2113 bool _ok;
2114 public:
2115 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
2116 bool ok() { return _ok; }
2117 virtual void do_oop(oop* p) {
2118 if (oopDesc::is_oop_or_null(*p)) return;
2119 if (_ok) {
2120 _nm->print_nmethod(true);
2121 _ok = false;
2122 }
2123 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2124 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2125 }
2126 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2127 };
2128
2129 void nmethod::verify() {
2130
2131 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant
2132 // seems odd.
2133
2134 if (is_zombie() || is_not_entrant() || is_unloaded())
2135 return;
2136
2137 // Make sure all the entry points are correctly aligned for patching.
2138 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
2139
2140 // assert(oopDesc::is_oop(method()), "must be valid");
2141
2142 ResourceMark rm;
2143
2144 if (!CodeCache::contains(this)) {
2145 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this));
2146 }
2147
2148 if(is_native_method() )
2149 return;
2150
2151 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
2152 if (nm != this) {
2153 fatal("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this));
2154 }
2155
2156 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2157 if (! p->verify(this)) {
2158 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this));
2159 }
2160 }
2161
2162 VerifyOopsClosure voc(this);
2163 oops_do(&voc);
2164 assert(voc.ok(), "embedded oops must be OK");
2165 Universe::heap()->verify_nmethod(this);
2166
2167 verify_scopes();
2168 }
2169
2170
2171 void nmethod::verify_interrupt_point(address call_site) {
2172 // Verify IC only when nmethod installation is finished.
2173 if (!is_not_installed()) {
2174 if (CompiledICLocker::is_safe(this)) {
2175 CompiledIC_at(this, call_site);
2176 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
2177 } else {
2178 CompiledICLocker ml_verify(this);
2179 CompiledIC_at(this, call_site);
2180 }
2181 }
2182
2183 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address());
2184 assert(pd != NULL, "PcDesc must exist");
2185 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(),
2186 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(),
2187 pd->return_oop());
2188 !sd->is_top(); sd = sd->sender()) {
2189 sd->verify();
2190 }
2191 }
2192
2193 void nmethod::verify_scopes() {
2194 if( !method() ) return; // Runtime stubs have no scope
2195 if (method()->is_native()) return; // Ignore stub methods.
2196 // iterate through all interrupt point
2197 // and verify the debug information is valid.
2198 RelocIterator iter((nmethod*)this);
2199 while (iter.next()) {
2200 address stub = NULL;
2201 switch (iter.type()) {
2202 case relocInfo::virtual_call_type:
2203 verify_interrupt_point(iter.addr());
2204 break;
2205 case relocInfo::opt_virtual_call_type:
2206 stub = iter.opt_virtual_call_reloc()->static_stub(false);
2207 verify_interrupt_point(iter.addr());
2208 break;
2209 case relocInfo::static_call_type:
2210 stub = iter.static_call_reloc()->static_stub(false);
2211 //verify_interrupt_point(iter.addr());
2212 break;
2213 case relocInfo::runtime_call_type:
2214 case relocInfo::runtime_call_w_cp_type: {
2215 address destination = iter.reloc()->value();
2216 // Right now there is no way to find out which entries support
2217 // an interrupt point. It would be nice if we had this
2218 // information in a table.
2219 break;
2220 }
2221 default:
2222 break;
2223 }
2224 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section");
2225 }
2226 }
2227
2228
2229 // -----------------------------------------------------------------------------
2230 // Printing operations
2231
2232 void nmethod::print() const {
2233 ResourceMark rm;
2234 ttyLocker ttyl; // keep the following output all in one block
2235
2236 tty->print("Compiled method ");
2237
2238 if (is_compiled_by_c1()) {
2239 tty->print("(c1) ");
2240 } else if (is_compiled_by_c2()) {
2241 tty->print("(c2) ");
2242 } else if (is_compiled_by_jvmci()) {
2243 tty->print("(JVMCI) ");
2244 } else {
2245 tty->print("(nm) ");
2246 }
2247
2248 print_on(tty, NULL);
2249
2250 if (WizardMode) {
2251 tty->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this));
2252 tty->print(" for method " INTPTR_FORMAT , p2i(method()));
2253 tty->print(" { ");
2254 tty->print_cr("%s ", state());
2255 tty->print_cr("}:");
2256 }
2257 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2258 p2i(this),
2259 p2i(this) + size(),
2260 size());
2261 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2262 p2i(relocation_begin()),
2263 p2i(relocation_end()),
2264 relocation_size());
2265 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2266 p2i(consts_begin()),
2267 p2i(consts_end()),
2268 consts_size());
2269 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2270 p2i(insts_begin()),
2271 p2i(insts_end()),
2272 insts_size());
2273 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2274 p2i(stub_begin()),
2275 p2i(stub_end()),
2276 stub_size());
2277 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2278 p2i(oops_begin()),
2279 p2i(oops_end()),
2280 oops_size());
2281 if (metadata_size () > 0) tty->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2282 p2i(metadata_begin()),
2283 p2i(metadata_end()),
2284 metadata_size());
2285 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2286 p2i(scopes_data_begin()),
2287 p2i(scopes_data_end()),
2288 scopes_data_size());
2289 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2290 p2i(scopes_pcs_begin()),
2291 p2i(scopes_pcs_end()),
2292 scopes_pcs_size());
2293 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2294 p2i(dependencies_begin()),
2295 p2i(dependencies_end()),
2296 dependencies_size());
2297 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2298 p2i(handler_table_begin()),
2299 p2i(handler_table_end()),
2300 handler_table_size());
2301 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2302 p2i(nul_chk_table_begin()),
2303 p2i(nul_chk_table_end()),
2304 nul_chk_table_size());
2305 #if INCLUDE_JVMCI
2306 if (speculations_size () > 0) tty->print_cr(" speculations [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2307 p2i(speculations_begin()),
2308 p2i(speculations_end()),
2309 speculations_size());
2310 if (jvmci_data_size () > 0) tty->print_cr(" JVMCI data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2311 p2i(jvmci_data_begin()),
2312 p2i(jvmci_data_end()),
2313 jvmci_data_size());
2314 #endif
2315 }
2316
2317 #ifndef PRODUCT
2318
2319 void nmethod::print_scopes() {
2320 // Find the first pc desc for all scopes in the code and print it.
2321 ResourceMark rm;
2322 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2323 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
2324 continue;
2325
2326 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
2327 while (sd != NULL) {
2328 sd->print_on(tty, p);
2329 sd = sd->sender();
2330 }
2331 }
2332 }
2333
2334 void nmethod::print_dependencies() {
2335 ResourceMark rm;
2336 ttyLocker ttyl; // keep the following output all in one block
2337 tty->print_cr("Dependencies:");
2338 for (Dependencies::DepStream deps(this); deps.next(); ) {
2339 deps.print_dependency();
2340 Klass* ctxk = deps.context_type();
2341 if (ctxk != NULL) {
2342 if (ctxk->is_instance_klass() && InstanceKlass::cast(ctxk)->is_dependent_nmethod(this)) {
2343 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name());
2344 }
2345 }
2346 deps.log_dependency(); // put it into the xml log also
2347 }
2348 }
2349
2350
2351 void nmethod::print_relocations() {
2352 ResourceMark m; // in case methods get printed via the debugger
2353 tty->print_cr("relocations:");
2354 RelocIterator iter(this);
2355 iter.print();
2356 }
2357
2358
2359 void nmethod::print_pcs() {
2360 ResourceMark m; // in case methods get printed via debugger
2361 tty->print_cr("pc-bytecode offsets:");
2362 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2363 p->print(this);
2364 }
2365 }
2366
2367 void nmethod::print_recorded_oops() {
2368 tty->print_cr("Recorded oops:");
2369 for (int i = 0; i < oops_count(); i++) {
2370 oop o = oop_at(i);
2371 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(o));
2372 if (o == Universe::non_oop_word()) {
2373 tty->print("non-oop word");
2374 } else {
2375 if (o != NULL) {
2376 o->print_value();
2377 } else {
2378 tty->print_cr("NULL");
2379 }
2380 }
2381 tty->cr();
2382 }
2383 }
2384
2385 void nmethod::print_recorded_metadata() {
2386 tty->print_cr("Recorded metadata:");
2387 for (int i = 0; i < metadata_count(); i++) {
2388 Metadata* m = metadata_at(i);
2389 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(m));
2390 if (m == (Metadata*)Universe::non_oop_word()) {
2391 tty->print("non-metadata word");
2392 } else {
2393 Metadata::print_value_on_maybe_null(tty, m);
2394 }
2395 tty->cr();
2396 }
2397 }
2398
2399 #endif // PRODUCT
2400
2401 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
2402 RelocIterator iter(this, begin, end);
2403 bool have_one = false;
2404 while (iter.next()) {
2405 have_one = true;
2406 switch (iter.type()) {
2407 case relocInfo::none: return "no_reloc";
2408 case relocInfo::oop_type: {
2409 stringStream st;
2410 oop_Relocation* r = iter.oop_reloc();
2411 oop obj = r->oop_value();
2412 st.print("oop(");
2413 if (obj == NULL) st.print("NULL");
2414 else obj->print_value_on(&st);
2415 st.print(")");
2416 return st.as_string();
2417 }
2418 case relocInfo::metadata_type: {
2419 stringStream st;
2420 metadata_Relocation* r = iter.metadata_reloc();
2421 Metadata* obj = r->metadata_value();
2422 st.print("metadata(");
2423 if (obj == NULL) st.print("NULL");
2424 else obj->print_value_on(&st);
2425 st.print(")");
2426 return st.as_string();
2427 }
2428 case relocInfo::runtime_call_type:
2429 case relocInfo::runtime_call_w_cp_type: {
2430 stringStream st;
2431 st.print("runtime_call");
2432 CallRelocation* r = (CallRelocation*)iter.reloc();
2433 address dest = r->destination();
2434 CodeBlob* cb = CodeCache::find_blob(dest);
2435 if (cb != NULL) {
2436 st.print(" %s", cb->name());
2437 } else {
2438 ResourceMark rm;
2439 const int buflen = 1024;
2440 char* buf = NEW_RESOURCE_ARRAY(char, buflen);
2441 int offset;
2442 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) {
2443 st.print(" %s", buf);
2444 if (offset != 0) {
2445 st.print("+%d", offset);
2446 }
2447 }
2448 }
2449 return st.as_string();
2450 }
2451 case relocInfo::virtual_call_type: {
2452 stringStream st;
2453 st.print_raw("virtual_call");
2454 virtual_call_Relocation* r = iter.virtual_call_reloc();
2455 Method* m = r->method_value();
2456 if (m != NULL) {
2457 assert(m->is_method(), "");
2458 m->print_short_name(&st);
2459 }
2460 return st.as_string();
2461 }
2462 case relocInfo::opt_virtual_call_type: {
2463 stringStream st;
2464 st.print_raw("optimized virtual_call");
2465 opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc();
2466 Method* m = r->method_value();
2467 if (m != NULL) {
2468 assert(m->is_method(), "");
2469 m->print_short_name(&st);
2470 }
2471 return st.as_string();
2472 }
2473 case relocInfo::static_call_type: {
2474 stringStream st;
2475 st.print_raw("static_call");
2476 static_call_Relocation* r = iter.static_call_reloc();
2477 Method* m = r->method_value();
2478 if (m != NULL) {
2479 assert(m->is_method(), "");
2480 m->print_short_name(&st);
2481 }
2482 return st.as_string();
2483 }
2484 case relocInfo::static_stub_type: return "static_stub";
2485 case relocInfo::external_word_type: return "external_word";
2486 case relocInfo::internal_word_type: return "internal_word";
2487 case relocInfo::section_word_type: return "section_word";
2488 case relocInfo::poll_type: return "poll";
2489 case relocInfo::poll_return_type: return "poll_return";
2490 case relocInfo::trampoline_stub_type: return "trampoline_stub";
2491 case relocInfo::type_mask: return "type_bit_mask";
2492
2493 default:
2494 break;
2495 }
2496 }
2497 return have_one ? "other" : NULL;
2498 }
2499
2500 // Return a the last scope in (begin..end]
2501 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
2502 PcDesc* p = pc_desc_near(begin+1);
2503 if (p != NULL && p->real_pc(this) <= end) {
2504 return new ScopeDesc(this, p->scope_decode_offset(),
2505 p->obj_decode_offset(), p->should_reexecute(), p->rethrow_exception(),
2506 p->return_oop());
2507 }
2508 return NULL;
2509 }
2510
2511 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const {
2512 if (block_begin == entry_point()) stream->print_cr("[Entry Point]");
2513 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]");
2514 if (JVMCI_ONLY(_exception_offset >= 0 &&) block_begin == exception_begin()) stream->print_cr("[Exception Handler]");
2515 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]");
2516 if (JVMCI_ONLY(_deopt_handler_begin != NULL &&) block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]");
2517
2518 if (has_method_handle_invokes())
2519 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]");
2520
2521 if (block_begin == consts_begin()) stream->print_cr("[Constants]");
2522
2523 if (block_begin == entry_point()) {
2524 methodHandle m = method();
2525 if (m.not_null()) {
2526 stream->print(" # ");
2527 m->print_value_on(stream);
2528 stream->cr();
2529 }
2530 if (m.not_null() && !is_osr_method()) {
2531 ResourceMark rm;
2532 int sizeargs = m->size_of_parameters();
2533 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
2534 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
2535 {
2536 int sig_index = 0;
2537 if (!m->is_static())
2538 sig_bt[sig_index++] = T_OBJECT; // 'this'
2539 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) {
2540 BasicType t = ss.type();
2541 sig_bt[sig_index++] = t;
2542 if (type2size[t] == 2) {
2543 sig_bt[sig_index++] = T_VOID;
2544 } else {
2545 assert(type2size[t] == 1, "size is 1 or 2");
2546 }
2547 }
2548 assert(sig_index == sizeargs, "");
2549 }
2550 const char* spname = "sp"; // make arch-specific?
2551 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false);
2552 int stack_slot_offset = this->frame_size() * wordSize;
2553 int tab1 = 14, tab2 = 24;
2554 int sig_index = 0;
2555 int arg_index = (m->is_static() ? 0 : -1);
2556 bool did_old_sp = false;
2557 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) {
2558 bool at_this = (arg_index == -1);
2559 bool at_old_sp = false;
2560 BasicType t = (at_this ? T_OBJECT : ss.type());
2561 assert(t == sig_bt[sig_index], "sigs in sync");
2562 if (at_this)
2563 stream->print(" # this: ");
2564 else
2565 stream->print(" # parm%d: ", arg_index);
2566 stream->move_to(tab1);
2567 VMReg fst = regs[sig_index].first();
2568 VMReg snd = regs[sig_index].second();
2569 if (fst->is_reg()) {
2570 stream->print("%s", fst->name());
2571 if (snd->is_valid()) {
2572 stream->print(":%s", snd->name());
2573 }
2574 } else if (fst->is_stack()) {
2575 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
2576 if (offset == stack_slot_offset) at_old_sp = true;
2577 stream->print("[%s+0x%x]", spname, offset);
2578 } else {
2579 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
2580 }
2581 stream->print(" ");
2582 stream->move_to(tab2);
2583 stream->print("= ");
2584 if (at_this) {
2585 m->method_holder()->print_value_on(stream);
2586 } else {
2587 bool did_name = false;
2588 if (!at_this && ss.is_object()) {
2589 Symbol* name = ss.as_symbol_or_null();
2590 if (name != NULL) {
2591 name->print_value_on(stream);
2592 did_name = true;
2593 }
2594 }
2595 if (!did_name)
2596 stream->print("%s", type2name(t));
2597 }
2598 if (at_old_sp) {
2599 stream->print(" (%s of caller)", spname);
2600 did_old_sp = true;
2601 }
2602 stream->cr();
2603 sig_index += type2size[t];
2604 arg_index += 1;
2605 if (!at_this) ss.next();
2606 }
2607 if (!did_old_sp) {
2608 stream->print(" # ");
2609 stream->move_to(tab1);
2610 stream->print("[%s+0x%x]", spname, stack_slot_offset);
2611 stream->print(" (%s of caller)", spname);
2612 stream->cr();
2613 }
2614 }
2615 }
2616 }
2617
2618 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) {
2619 // First, find an oopmap in (begin, end].
2620 // We use the odd half-closed interval so that oop maps and scope descs
2621 // which are tied to the byte after a call are printed with the call itself.
2622 address base = code_begin();
2623 ImmutableOopMapSet* oms = oop_maps();
2624 if (oms != NULL) {
2625 for (int i = 0, imax = oms->count(); i < imax; i++) {
2626 const ImmutableOopMapPair* pair = oms->pair_at(i);
2627 const ImmutableOopMap* om = pair->get_from(oms);
2628 address pc = base + pair->pc_offset();
2629 if (pc > begin) {
2630 if (pc <= end) {
2631 st->move_to(column);
2632 st->print("; ");
2633 om->print_on(st);
2634 }
2635 break;
2636 }
2637 }
2638 }
2639
2640 // Print any debug info present at this pc.
2641 ScopeDesc* sd = scope_desc_in(begin, end);
2642 if (sd != NULL) {
2643 st->move_to(column);
2644 if (sd->bci() == SynchronizationEntryBCI) {
2645 st->print(";*synchronization entry");
2646 } else if (sd->bci() == AfterBci) {
2647 st->print(";* method exit (unlocked if synchronized)");
2648 } else if (sd->bci() == UnwindBci) {
2649 st->print(";* unwind (locked if synchronized)");
2650 } else if (sd->bci() == AfterExceptionBci) {
2651 st->print(";* unwind (unlocked if synchronized)");
2652 } else if (sd->bci() == UnknownBci) {
2653 st->print(";* unknown");
2654 } else if (sd->bci() == InvalidFrameStateBci) {
2655 st->print(";* invalid frame state");
2656 } else {
2657 if (sd->method() == NULL) {
2658 st->print("method is NULL");
2659 } else if (sd->method()->is_native()) {
2660 st->print("method is native");
2661 } else {
2662 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci());
2663 st->print(";*%s", Bytecodes::name(bc));
2664 switch (bc) {
2665 case Bytecodes::_invokevirtual:
2666 case Bytecodes::_invokespecial:
2667 case Bytecodes::_invokestatic:
2668 case Bytecodes::_invokeinterface:
2669 {
2670 Bytecode_invoke invoke(sd->method(), sd->bci());
2671 st->print(" ");
2672 if (invoke.name() != NULL)
2673 invoke.name()->print_symbol_on(st);
2674 else
2675 st->print("<UNKNOWN>");
2676 break;
2677 }
2678 case Bytecodes::_getfield:
2679 case Bytecodes::_putfield:
2680 case Bytecodes::_getstatic:
2681 case Bytecodes::_putstatic:
2682 {
2683 Bytecode_field field(sd->method(), sd->bci());
2684 st->print(" ");
2685 if (field.name() != NULL)
2686 field.name()->print_symbol_on(st);
2687 else
2688 st->print("<UNKNOWN>");
2689 }
2690 default:
2691 break;
2692 }
2693 }
2694 st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop());
2695 }
2696
2697 // Print all scopes
2698 for (;sd != NULL; sd = sd->sender()) {
2699 st->move_to(column);
2700 st->print("; -");
2701 if (sd->method() == NULL) {
2702 st->print("method is NULL");
2703 } else {
2704 sd->method()->print_short_name(st);
2705 }
2706 int lineno = sd->method()->line_number_from_bci(sd->bci());
2707 if (lineno != -1) {
2708 st->print("@%d (line %d)", sd->bci(), lineno);
2709 } else {
2710 st->print("@%d", sd->bci());
2711 }
2712 st->cr();
2713 }
2714 }
2715
2716 // Print relocation information
2717 const char* str = reloc_string_for(begin, end);
2718 if (str != NULL) {
2719 if (sd != NULL) st->cr();
2720 st->move_to(column);
2721 st->print("; {%s}", str);
2722 }
2723 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin());
2724 if (cont_offset != 0) {
2725 st->move_to(column);
2726 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset));
2727 }
2728
2729 }
2730
2731 class DirectNativeCallWrapper: public NativeCallWrapper {
2732 private:
2733 NativeCall* _call;
2734
2735 public:
2736 DirectNativeCallWrapper(NativeCall* call) : _call(call) {}
2737
2738 virtual address destination() const { return _call->destination(); }
2739 virtual address instruction_address() const { return _call->instruction_address(); }
2740 virtual address next_instruction_address() const { return _call->next_instruction_address(); }
2741 virtual address return_address() const { return _call->return_address(); }
2742
2743 virtual address get_resolve_call_stub(bool is_optimized) const {
2744 if (is_optimized) {
2745 return SharedRuntime::get_resolve_opt_virtual_call_stub();
2746 }
2747 return SharedRuntime::get_resolve_virtual_call_stub();
2748 }
2749
2750 virtual void set_destination_mt_safe(address dest) {
2751 #if INCLUDE_AOT
2752 if (UseAOT) {
2753 CodeBlob* callee = CodeCache::find_blob(dest);
2754 CompiledMethod* cm = callee->as_compiled_method_or_null();
2755 if (cm != NULL && cm->is_far_code()) {
2756 // Temporary fix, see JDK-8143106
2757 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address());
2758 csc->set_to_far(methodHandle(cm->method()), dest);
2759 return;
2760 }
2761 }
2762 #endif
2763 _call->set_destination_mt_safe(dest);
2764 }
2765
2766 virtual void set_to_interpreted(const methodHandle& method, CompiledICInfo& info) {
2767 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address());
2768 #if INCLUDE_AOT
2769 if (info.to_aot()) {
2770 csc->set_to_far(method, info.entry());
2771 } else
2772 #endif
2773 {
2774 csc->set_to_interpreted(method, info.entry());
2775 }
2776 }
2777
2778 virtual void verify() const {
2779 // make sure code pattern is actually a call imm32 instruction
2780 _call->verify();
2781 _call->verify_alignment();
2782 }
2783
2784 virtual void verify_resolve_call(address dest) const {
2785 CodeBlob* db = CodeCache::find_blob_unsafe(dest);
2786 assert(db != NULL && !db->is_adapter_blob(), "must use stub!");
2787 }
2788
2789 virtual bool is_call_to_interpreted(address dest) const {
2790 CodeBlob* cb = CodeCache::find_blob(_call->instruction_address());
2791 return cb->contains(dest);
2792 }
2793
2794 virtual bool is_safe_for_patching() const { return false; }
2795
2796 virtual NativeInstruction* get_load_instruction(virtual_call_Relocation* r) const {
2797 return nativeMovConstReg_at(r->cached_value());
2798 }
2799
2800 virtual void *get_data(NativeInstruction* instruction) const {
2801 return (void*)((NativeMovConstReg*) instruction)->data();
2802 }
2803
2804 virtual void set_data(NativeInstruction* instruction, intptr_t data) {
2805 ((NativeMovConstReg*) instruction)->set_data(data);
2806 }
2807 };
2808
2809 NativeCallWrapper* nmethod::call_wrapper_at(address call) const {
2810 return new DirectNativeCallWrapper((NativeCall*) call);
2811 }
2812
2813 NativeCallWrapper* nmethod::call_wrapper_before(address return_pc) const {
2814 return new DirectNativeCallWrapper(nativeCall_before(return_pc));
2815 }
2816
2817 address nmethod::call_instruction_address(address pc) const {
2818 if (NativeCall::is_call_before(pc)) {
2819 NativeCall *ncall = nativeCall_before(pc);
2820 return ncall->instruction_address();
2821 }
2822 return NULL;
2823 }
2824
2825 CompiledStaticCall* nmethod::compiledStaticCall_at(Relocation* call_site) const {
2826 return CompiledDirectStaticCall::at(call_site);
2827 }
2828
2829 CompiledStaticCall* nmethod::compiledStaticCall_at(address call_site) const {
2830 return CompiledDirectStaticCall::at(call_site);
2831 }
2832
2833 CompiledStaticCall* nmethod::compiledStaticCall_before(address return_addr) const {
2834 return CompiledDirectStaticCall::before(return_addr);
2835 }
2836
2837 #ifndef PRODUCT
2838
2839 void nmethod::print_value_on(outputStream* st) const {
2840 st->print("nmethod");
2841 print_on(st, NULL);
2842 }
2843
2844 void nmethod::print_calls(outputStream* st) {
2845 RelocIterator iter(this);
2846 while (iter.next()) {
2847 switch (iter.type()) {
2848 case relocInfo::virtual_call_type:
2849 case relocInfo::opt_virtual_call_type: {
2850 CompiledICLocker ml_verify(this);
2851 CompiledIC_at(&iter)->print();
2852 break;
2853 }
2854 case relocInfo::static_call_type:
2855 st->print_cr("Static call at " INTPTR_FORMAT, p2i(iter.reloc()->addr()));
2856 CompiledDirectStaticCall::at(iter.reloc())->print();
2857 break;
2858 default:
2859 break;
2860 }
2861 }
2862 }
2863
2864 void nmethod::print_handler_table() {
2865 ExceptionHandlerTable(this).print();
2866 }
2867
2868 void nmethod::print_nul_chk_table() {
2869 ImplicitExceptionTable(this).print(code_begin());
2870 }
2871
2872 void nmethod::print_statistics() {
2873 ttyLocker ttyl;
2874 if (xtty != NULL) xtty->head("statistics type='nmethod'");
2875 native_nmethod_stats.print_native_nmethod_stats();
2876 #ifdef COMPILER1
2877 c1_java_nmethod_stats.print_nmethod_stats("C1");
2878 #endif
2879 #ifdef COMPILER2
2880 c2_java_nmethod_stats.print_nmethod_stats("C2");
2881 #endif
2882 #if INCLUDE_JVMCI
2883 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI");
2884 #endif
2885 unknown_java_nmethod_stats.print_nmethod_stats("Unknown");
2886 DebugInformationRecorder::print_statistics();
2887 #ifndef PRODUCT
2888 pc_nmethod_stats.print_pc_stats();
2889 #endif
2890 Dependencies::print_statistics();
2891 if (xtty != NULL) xtty->tail("statistics");
2892 }
2893
2894 #endif // !PRODUCT
2895
2896 #if INCLUDE_JVMCI
2897 void nmethod::update_speculation(JavaThread* thread) {
2898 jlong speculation = thread->pending_failed_speculation();
2899 if (speculation != 0) {
2900 guarantee(jvmci_nmethod_data() != NULL, "failed speculation in nmethod without failed speculation list");
2901 jvmci_nmethod_data()->add_failed_speculation(this, speculation);
2902 thread->set_pending_failed_speculation(0);
2903 }
2904 }
2905
2906 const char* nmethod::jvmci_name() {
2907 if (jvmci_nmethod_data() != NULL) {
2908 return jvmci_nmethod_data()->name();
2909 }
2910 return NULL;
2911 }
2912 #endif